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 YOUR
POSITION ：PRODUCTS >>
X-ray
Film Viewer, X ray Film Viewer
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 X-ray Film Viewer,
X ray Film Viewer，X-ray viewer,X ray viewer |
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Automatic light intensity control for x-ray film
viewer |
The intensity of light
penetrating an X-ray film being viewed is automatically
maintained at a preset, adjustable, eye comfort level. A
photosensor detects the average light level on the
observer side, and its output controls the charging time
of a capacitor coupled to the emitter of a unijunction
transistor. When the capacitor reaches a predetermined
voltage it fires the transistor and dumps its charge
through a pulse generator which in turn triggers a gated
semiconductor connected in series with the viewer light
source. The period between successive firing cycles is
proportional to the penetrating light level. Thus, if
the light level increases, as when a relatively
transparent film negative is inserted in the viewer or
when a negative is removed, the capacitor charging time
increases, the firing period increases, and the light
source intensity therefore decreases to restore the
preset level of light penetration.
1. In a photographic film viewer including a light
diffuser screen, means for positioning a film adjacent
one side of the screen, a housing surrounding the other
side of the screen, and a light source disposed within
the housing for projecting light through the screen and
film, automatic light intensity control means
comprising:
a. photo-detector means spaced from the screen on said
one side thereof opposite the housing and oriented with
respect to the plane of the film to detect only the
intensity of light penetrating through the vicinity of
the center portion of the screen and film and to shield
ambient light therefrom, and
b. electrical circuit means for automatically
controlling the brightness of the light source in
response to an output signal from the photo-detector
means, whereby the brightness of the light source is
increased when the light penetrating through the screen
and film decreases, and vice versa.
2. A photographic film viewer as defined in claim 1
wherein the electrical circuit means comprises:
a. a light receiving circuit responsive to the
photo-detector means output for producing an output
voltage inversely proportional to the detected level of
light penetrating through the screen and film,
b. a capacitor coupled to said output voltage and
charged thereby,
c. means including a unijunction transistor and a pulse
transformer for generating a current pulse when the
capacitor charge reaches a predetermined level, and
d. a gate controlled semiconductor switch connected in
series with the light source across a power source and
conductively responsive to said current pulse.
3. A photographic film viewer as defined in claim 2
further comprising manual control means for adjusting
the charging voltage applied to the capacitor.
4. A photographic film viewer as defined in claim 3
wherein the manual control means is operable in
conjunction with the photo-detector means.
5. A photographic film viewer as defined in claim 3
wherein the manual control means is operable
independently of the photo-detector means.
6. A photographic film viewer as defined in claim 2
wherein the light source is a halogen lamp and the
photo-detector means is a photo-transistor.
7. A photographic film viewer as defined in claim 2
wherein the light source is a fluorescent lamp and the
photo-detector means is a cadmium sulphide cell.
Description:BACKGROUND OF THE INVENTION
This invention relates to an automatic light intensity
control system for a high-density X-ray film viewer.
Industrial X-ray pictures are employed for inspecting
the interior of a metallic member or casting, or a weld
of such a casting, and, in general, such pictures have a
very wide density range. Accordingly, in order to enable
the detection of defects from a high-density film, a
viewer capable of providing a high degree of
illumination must be used. With such a viewer, however,
an observer's eyes are quickly dazzled when directly
exposed to the bare viewer screen, and he therefore
becomes easily fatigued. Even when a film is placed in
the viewer, depending upon the configuration and the
density of the photographed object, detailed observation
is difficult and tedious because the brightness is
excessive or the contrast is too low. To overcome this
difficulty, a viewing device with a manual light
intensity control has been proposed. However, such a
device still suffers from a variety of disadvantages, as
described below. Whenever a film is placed in the
viewer, the intensity of the light must be manually
adjusted, and it is therefore difficult to maintain
constant illumination conditions at all times. Further,
when the film is removed the observer's eyes are exposed
to intense light and are therefore dazzled or
temporarily blinded. To avoid this the light control
must be manually adjusted whenever a film is inserted in
or removed from the viewer.
SUMMARY OF THE INVENTION
According to this invention, no matter what the density
of a film is the observer can always view it as an image
having a constant brightness. Furthermore, when no film
is inserted in the viewer the brightness of the
illumination surface is automatically reduced, and
accordingly the observer's eyes will never be dazzled.
The viewer according to this invention is an automatic
light intensity control type of photographic image
viewer having a light source and a light diffusion
illumination surface, a photo-detector spaced from the
illumination surface to sense the light penetrating
through the surface, and means for controlling the
brightness of the light source in response to the signal
produced by the photo-detector.
The photo-detector is disposed on the observer side of
the device to detect the level of light passing through
the film placed adjacent to the illumination surface.
The photo-detector may be mounted at various positions,
as determined by, inter alia, the range of penetration
density of a given X-ray film. That is, in some
instances the average density over the entire X-ray film
must be detected, and in other situations the density of
just a particular portion or area of the film must be
detected. Depending upon these circumstances, the
directional orientation and the mounting position of the
photo-detector may be suitably determined.
Both ordinary and industrial X-ray pictures usually
having the image of an object at their central portion,
and accordingly the peripheral or outside part of the
picture is directly irradiated with X-rays. Such
peripheral part of the picture has high density, and
accordingly, the photo-detection of the central portion
of the film is most suitable in such instances. If a
small size film is being viewed, then the illumination
should be shielded from the other parts of the screen
with a suitable mask.
A second point which should be taken into consideration
is to minimize the effect of ambient light at the place
where the observation is carried out. For this purpose,
it is desirable to shield the ambient light with a hood,
for example, and to properly set the mounting angle of
the photo-detector with respect to the plane of the
film.
A third point is the arrangement of the photo-detector
so that it does not obstruct the placing of the film on
the viewer or its removal, and does not interfere with
the observation of the film.
It is desirable that the spectral sensitivity
characteristic of the photo-detector lies in the visible
light region only. Otherwise, the ultraviolet or
infrared light components are detected whereby the
intensity of the light source is erroneously controlled.
A filter may be employed for this purpose in front of a
silicon photo-transistor, or a semiconductor detector in
which such a filter is built-in may be used.
Alternately, a cadmium sulphide photo-detector may be
employed because it is primarily sensitive to light in
the visible region.
It is preferable to employ a thyristor circuit as a
means for controlling the brightness of the light
source. When the density of the film is high the light
input to the photo-detector is small, and therefore the
brightness of the light source is increased so that the
light input to the photo-detector is increased.
Conversely, if the film density is low, the brightness
of the light source is decreased.
The combination of an adjustable automatic light
intensity control and a manual light intensity control
is convenient in practical use. The adjustment of the
automatic control is necessary for varying the light
level depending on the ambient brightness and the
observer's wish. The manual light control is necessary
because there are some X-ray film objects which are not
suitable for automatic light control. That is, manual
light control must be used, for instance, where a part
of the object corresponding to the measuring range of
the photo-detector is hollow or high in density, and it
is desired to view other parts of the film.
Briefly, and according to this invention, the intensity
of light penetrating an X-ray film being viewed is
automatically maintained at a preset, adjustable, eye
comfort level. A photo-sensor detects the average light
level on the observer side, and its output controls the
charging time of a capacitor coupled to the emitter of a
unijunction transistor. When the capacitor reaches a
pedetermined voltage it fires the transistor and dumps
its charge through a pulse generator which in turn
triggers a gated semiconductor connected in series with
the viewer light source. The period between successive
firing cycles is proportional to the penetrating light
level. Thus, if the light level increases, as when a
relatively transparent film negative is inserted in the
viewer or when a negative is removed, the capacitor
charging time increases, the firing period increases,
and the light source intensity therefore decreases to
restore the preset level of light penetration.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows a schematic sectional view of a first
embodiment of an X-ray viewer according to this
invention, employing a halogen lamp light source,
FIG. 2 shows a schematic circuit diagram for controlling
the embodiment of FIG. 1,
FIG. 3 shows a schematic sectional view of a second
embodiment of the invention, employing fluorescent lamps
as the light source, and
FIG. 4 shows a schematic circuit diagram for controlling
the second embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the accompanying drawings, FIG. 1 shows a
schematic sectional view of a first embodiment of an
X-ray film viewer according to the invention comprising
a casing or chamber 10, a light source or lamp 14, a
reflecting plate 15, a heat absorbing glass plate 11, a
light diffusion plate 12, clips 20 for holding an X-ray
film 13, a photo-detector 17 for detecting the intensity
of the light penetrating through the film, a light
control circuit 16 disposed at the lower part of the
housing, a manual control knob 18 for setting the
intensity level of the light, and a blower 19 for
cooling the diffusion plate 12. The lamp 14,
photo-detector 17, and control knob 18 are electrically
connected to the light control circuit 16.
The FIG. 2 shows a schematic circuit diagram of one
embodiment of a light control circuit 16 for the viewer
of FIG. 1 which employs a halogen lamp as the light
source 14. This circuit can be divided into four
sections: a lamp circuit 21, a light receiving circuit
22, a manual light controlling circuit 23, and a pulse
generating circuit 24. The lamp circuit 21 is
fundamentally made up of a light source or lamp 25 and a
bi-directional thyristor (TRIAC)26 connected in series
across the a.c. power source. The lamp circuit further
comprises a thermally operative fuse or temperature
fuse, not shown. To control the brightness of the lamp
25, a pulse generated by the circuit 24 is applied to
the gate of the TRIAC 26 through a pulse transformer 27,
in such a manner as to phase-control the a.c. power
source.
In the light receiving circuit 22, a photo-transistor
28, which detects the intensity of the light passing
through the X-ray film, is connected through a fixed
resistor 29 and a variable resistor 31 across a constant
voltage regulated power supply made up of a Zener diode
30 and a diode rectifier bridge 34.
When the photo-transistor 28 receives no light it is
non-conductive and a constant voltage is thus amplified
by transistors 32 and 33 and applied, as a lamp
brightness control voltage, to the pulse generating
circuit 24. On the other hand, when the photo-transistor
28 receives light it is rendered conductive and the
voltage applied to the base of transistor 32 is reduced.
The conduction of photo-transistor 28 is proportional to
the intensity of the light incident thereon, and thus as
the intensity of the light increases the brightness
control signal decreases.
In the pulse generating circuit, a full-wave
rectification voltage is applied through a resistor to a
Zener diode 35 to obtain a constant voltage, which
serves to charge a capacitor 38 through a resistor 37.
In addition, the above-described lamp brightness control
voltage is also applied to the capacitor 38 through a
change-over switch 44 and a diode 36. Accordingly, the
charging time of the capacitor 38 is a function of the
sum of the lamp brightness control voltage and the
charging voltage. The capacitor voltage is applied to
the emitter of a unijunction transistor 39, one base b 2
of which is connected through a resistor 40 to the power
supply, while the other base b 1 is grounded through the
pulse transformer 27. When the emitter voltage, or the
voltage across the capacitor 38, exceeds a predetermined
value, the unijunction transistor 39 is rendered
conductive and the capacitor 38 is discharged through
the pulse transformer 27. After discharge of the
capacitor 38 the transistor 39 is rendered
non-conductive, and the capacitor 38 begins to charge
again. At the time of discharge a pulse is generated in
the secondary winding of the pulse transformer 27 to
trigger the TRIAC 26. The period or frequency of
recurrence of this triggering pulse is determined by the
magnitudes of the superimposed brightness and control
voltages. As the intensity of the light applied to the
photo-transistor 28 is increased, the brightness control
voltage is decreased and the period of time between
successive triggering pulses is increased, as a result
of which the brightness of the lamp 25 is decreased. In
addition, since the brightness control voltage may be
changed by varying the resistance of the variable
resistor 31 in the light receiving circuit 22, the
brightness level of the lamp may be adjusted by
appropriately setting the resistor 31 through a further
control knob, not shown.
For manual control, the superimposed brightness voltage
is derived from a voltage dividing circuit consisting of
resistors 41, 42, and 43 by tripping the armature of a
change-over switch 44 in the manual light controlling
circuit 24. The resistor 42 is variable, and light
control can thus be achieved by manually changing its
resistance via the control knob 18 in FIG. 1.
Thus, and as described above, the light passing through
the X-ray film is detected, and the light source is
automatically controlled in response thereto so that the
penetrating light is maintained at a constant level of
intensity. Accordingly, the observer views the film at a
substantially constant intensity level, which may be
suitably adjusted or set according to each individuals
eye comfort. When the film is removed from the device
the intensity of the lamp is automatically reduced, and
the eyes of the observer are thus not dazzled or blinded
by a bright illumination surface.
FIGS. 3 and 4 show a schematic sectional view and a
light control circuit, respectively, illustrating
another embodiment of the invention, wherein the X-ray
film viewer employs fluorescent lamps. The device, as
shown in FIG. 3, comprises a housing or chamber 110, a
plurality of fluorescent lamps 114a, 114b, . . . , a
diffusion plate 112, clips 120 for holding an X-ray film
113, a photo-detector 117 for detecting the penetrating
light, a control circuit 116 placed at the lower portion
of the chamber, a knob 118 for manually setting the
intensity level of the light, and a cooling blower 119.
The electrical wiring is not shown in FIG. 3, but it
will be described with reference to FIG. 4.
The circuit of FIG. 4 is similar to the halogen lamp
light control circuit shown in FIG. 2, and employs a
cadmimum sulphide photo conductive cell (CdS cell). The
essential elements of the circuit shown in FIG. 4 are
the light control circuit 116, the fluorescent lamp 114a
(the other fluorescent lamps being omitted for
simplification), and a stabilizer or ballast 111a for
the fluorescent lamp. In the control circuit 116 a full
wave rectification voltage obtained through a diode
bridge 121 is divided by a resistor 122 and a CdS cell
123, and is applied, as a pedestal voltage, to a
capacitor 126 through a diode 124. The capacitor 126 is
charged through a variable resistor 125. The voltage
across the capacitor is applied to the emitter of a
unijunction transistor 139. When the voltage across the
capacitor reaches a predetermined value the transistor
139 is rendered conductive, whereupon the capacitor is
quickly discharged while the emitter voltage is lowered.
As a result, the transistor becomes non-conductive
again. When the transistor 139 fires, a pulse is
produced which triggers an SCR 130. Since the SCR is
connected in series across the full-wave rectified
voltage through a resistor 128 and a pulse transformer
131, pulses are produced in the secondary windings W1
and W2 of the pulse transformer. These pulses serve as
trigger pulses for SCR's 132a and 132b connected in
series in the light control line.
When the light penetrating the X-ray film is low in
intensity the resistance of the CdS cell 123 increases
and the pedestal voltage becomes high. The emitter
voltage of the unijunction transistor 139 is the sum of
this pedestal voltage and the charging voltage according
to a time constant defined by the values of the variable
resistor 125 and the capacitor 126. Accordingly, when
the pedestal voltage is increased, the period of time
required for charging the cpacitor to its firing level
is shortened, and the time period between successive
transistor firings is shortened. Therefore, with the aid
of the SCR light control circuit, the period of time
during which the fluorescent lamp is energized is
increased, and the light intensity is increased. In
contrast, when the intensity of the penetrating light is
high, the intensity of the fluorescent lamp is
decreased. Thus, the quantity of the penetrating light
is maintained at a substantially constant level.
A heater line 140, a light control line 141, and a
common line 142 are connected to the fluorescent lamps
114a, 114b, . . . respectively through light control
stabilizers 111a, 111b, . . . In order to smoothly
control the intensity of light, rapid start fluorescent
lamps are employed. As is apparent from the above
description, even if the device employs fluorescent
lamps as the light source, the objects of the invention
can be easily achieved using the embodiment shown in
FIGS. 3 and 4.
Fluorescent lamps are advantageous in that they exhibit
high color temperatures, provide uniform illumination,
and consume less power. However, fluorescent lamps are
disadvantageous for viewing industrial X-ray films in
that their itensity level is low and therefore a number
of fluorescent lamps must be employed. In addition,
fluorescent lamps must be provided with ballast or
stabilizer coils, which increases their weight. Finally,
the light control circuit per se is more intricate and
costly than that for an incandescent lamp.
Where a halogen lamp is employed as the light source,
the light control circuit is simpler and the weight is
less. However, a halogen lamp is disadvantageous in that
a relatively large quantity of heat is generated, the
color temperature is low, and the color temperature
varies with the degree of light control. Accordingly,
the particular light source should be selected depending
upon the types of film to be viewed by the device.
The fact that the illumination intensity is
automatically reduced when a film is removed has the
added merits of reducing power consumption and heat
generation, which also prolongs the service life of the
lamps.
The present invention has been described only with
reference to X-ray film viewing. However, it goes
without saying that the concept of the invention can be
widely applied, for example to devices for observing
light transmissive films such as color photography
films. |
| Article Source: |
| http://www.freepatentsonline.com/4118654.html |
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X-ray film viewers |
| X-ray film
viewers NGP series
As the X-ray viewer is an
itermediate member in a train " physician's knowledge
and experience- up -to-date X-ray technique", high
quality of the viewer is a decisive factor for
successful radiological dignosis.
Poor quality of the viewer may be an obstacle making
impossible proper diagnosis in spite of the use of
advanced X-ray equipment and good knowledge and
experience of the physician.
NGP X-ray film viewers series is a modern line. We
offer:
- one-row X- ray film viewers
- two- row X- ray film viewers
- multiframe X- ray film viewers
- X- ray film viewers for mammograms
We offer viewers either with or without luminance
adjustment, also in high frequency version.
- hgh uniformity of screen luminance over
a whole viewing area: 4490 cd / m2 to
4110 cd / m2 as measured according to DIN 6856
- uniform screen in viewers of all the types made of
frosted perspex
- easy replacement of fluorescent lamps and igniters:
- easy access to fluorescent lamps and ignitions through
puting up the screen connected with the x-ray film
holder
- power supply-230V, 50 Hz
- esthetic metallic housing coated with powder-lacquer
All X- ray film viewers
are also in high-frequency version (HF).
Framed X-ray
film viewers
X-ray film viewers with
separate and independly illuminated frames.
- daylight Colour temperature 6500 K high uniformity of
screen luminance over a whole viewing area
- uniform screen
- easy replacement of fluorescent lamps and igniters
- wide range of adjustment
- esthetic metallic housing coated with powder-lacquer
- X-ray film viewers have necessary certificates
Mammogram X-ray
film viewers
The X-ray film viewers
for mammograms.
- all X-ray film viewer with high frequency converters
- very quick ignition of fluorescent lamps
- completely eliminated flickering effect
- infinitely variable adjustment of luminance within the
range from 10% to 100%
- energy saving up to 25%
- X-ray film viewer daylight colour temperature 6500 K
- 5500 cd/m2 luminance (greater than in conventional
viewers)
- better uniformity of the screen luminance
- infinitely variable adjustment of luminance (from 10%
to 100% of maximum luminance)
- lower screen inclined through 200 to vertical
- the viewers are designed for 18x24 cm or 24x30 cm
films
- four films cover completely the screen of one section
- each viewer is provided with a magnifying glass
- metallic housing with powder-laquer coating
- position of operation: standing or pendant
- modular design- separate power supply and luminance
adjustment for lower and upper sections
- arious configurations can be selected (lower section
up to 4 films 24x30 cm, upper section up to 4 films
18x24 cm) - version 31m/21m
- all X-ray film viewers have all necessary certificates
Shutter vesrions are equiped with 4 freely moving
shutters for glare-free film reading. The solution
ensures edge sharp collimation even of small image
areas.
Dental X-ray film
viewers
Dental type X-ray film
viewer for pantomograms or cephalograms. |
| Article Source: |
| http://www.conbest.pl/1DSL/ShopEn/default.asp?IDGroup=1194&opennodes=[1194][35] |
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X-ray viewers |
 The
DARAY DX4500 series of X-ray film viewers features a
distinctive and extremely modern slim design. Long-life
light sources provide clear, cool and diffuse
illumination.
Available as 1x, 2x, 3x and 4x panel wall-mounted units,
and as a single-panel desktop with carrying handle, the
DX4500 series range utilizes a
high-frequency inverter which reduces eye fatigue by
eliminating flicker, increases lamp life, and provides
instant lighting and relighting.
Slim design
The use of thin EEFL lamps for the high-tech display and
non-metallic materials for the casing enables the DX4500
series to be one of the world’s thinnest and lightest
X-ray film viewers.
Uniform Brightness
A luminance uniformity of over 90% is achieved by using
16 lamps, each with a diameter of 2.4mm, allowing the
user to see any part of the film with consistency to
facilitate accurate diagnosis.
Long-Life Lamps
Unlike traditional X-ray film viewers, the DX4500 series
use External Electrode Fluorescent Lamps (EEFL).
Compared with conventional fluorescent tubes, EEFL lamps
increase electrical efficiency, generate less heat and
minimize troublesome lamp replacement by having more
than ten times the life.
Variable Brightness Control
A variable brightness control is found under each panel
to compensate for various film densities and ambient
light levels.
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DX4501D
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Input voltage
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240V 50H
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Power consumption
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Dimensions (mm)
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Illuminated area (mm)
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Mass (kg)
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4.8
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2.3
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4.2
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6.1
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8.0
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Light source
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EEFL
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EEFL
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EEFL
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EEFL
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EEFL
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Lamp life (hours)
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over
20,000
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over
20,000
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over
20,000
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over
20,000
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over
20,000
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Luminosity (lux)
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7,000 -
12,000
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7,000 -
12,000
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7,000 -
12,000
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7,000 -
12,000
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7,000 -
12,000
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Products available |
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DX4501D |
Single X-ray film
viewer with desk stand, variable intensity |
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DX4501 |
Single X-ray film
viewer, variable intensity |
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DX4502 |
Double X-ray film viewer, variable intensity |
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DX4503 |
Triple X-ray film viewer, variable intensity |
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DX4504 |
Horizontal-quad X-ray film viewer, variable
intensity |
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| Article Source: |
| http://www.daray.co.uk/docs/DX4500.html |
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Pallas MV CCFL
X-ray Viewer |
Pallas MV CCFL (Cold
Cathode Fluorescent Lamps) Lightboxes for X-ray films.
CCFL is an excellent source of backlight for Liquid
Crystal Displays (LCD's), Personal Digital Assistants
(PDA's), scan and copy machines, as well as
advertisements. Lamp and wire in Pallas ultra thin light
panels are the same ones in your laptop computer
display.
Pallas MV illuminator with CCFL technology is ideal for
indoor medical, dental applications, such as x-ray
viewer.
Pallas MV light-panels made with unique technology and
latest equipment to achieve high quality.
Pallas MV single X-ray Viewer is ultra-think, only 18 mm
and high luminance over 2000 cd/m2 . It is energy-saving
model . Pallas media viewers have thin spring clamps to
hold x-ray film fixed. It's easy to slip film under
them.
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SPECIFICATION |
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Thickness |
18 mm |
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Lamps |
Pallas CCFL
(Cold Cathode Fluorescent Lamps) with
cold emission |
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Lamp Life |
> 30,000
hours |
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Lamp
Material |
Electrode
and phosphor of the lamp is from Japan,
glass tube from Germany and internal gas
from England. |
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Internal
Wire |
P/N: LG3633
or LG3239 from Korea |
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Brightness |
> 2,000
cd/m2 |
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Color
temperature |
7500K |
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Light Method |
Pallas Light
Guide Panel (LGP), edge lighting |
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Frame |
Polished
Aluminum Frame (20 mm both sides, 34 mm
bottom and up) |
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Adaptor |
CE / UL
Certificate |
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Input |
AC 110 / 240
V, 50 ~ 60 Hz |
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Output |
DC 12V
 |
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Power
Consumption |
Low power
consumption, saving over 25% energy over
T5 tubes |
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Hang Ways |
Hanging,
Standing and Against Wall
Optional table stands
and wall mounting kits are available. |
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Working |
Plug and
Play with main switch |
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Package |
Carton |
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| Article Source: |
| http://www.digit.hu/english/xrayvieweren.html |
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Medical X-ray
film viewer |
Detailed Selling
DescriptionPost Time：06/05/2006
Expiry Date：360
Features Specifications:
We have single X-ray film viewers, double X-ray film
viewers and triple X-ray film viewers.
Features:
1) Adopted with advanced clipping device
2) Films are easily to be inserted and taken out, and
clipped firmly
3) It is the first one to make the viewer body with
aluminum-alloy
To shape wholly in
4) domestic. It is beautiful in appearance
5) The screen is made of import white polymath
methacrylate plate,
It is bright
6) clean, Anti-ultraviolet ray, and never fade in color.
7) The product is designed reasonable, and easily to
maintenance.
Specifications:
1) One connection to 12 connections
2) Working voltage: AC220V |
| Article Source: |
|
http://www.ec51.com/sell-price-medical_x_ray_film_viewer-130236.html |
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Ultra Thin
X-Ray Film Viewer |
A Turkish SME is looking
for cooperation to broaden the application areas of its
innovative negatoscope. Being the thinnest one in the
world, the developed negatoscope provides uniformly
distributed, higher-temperature light. The company is
interested in all types of cooperation, including
licensing agreements, joint ventures or technical
cooperation agreements.
Negatoscopes are used for viewing X-ray films, mainly
working as a backlighted panel. The conventional
negatoscopes have fluorescent lamps, placed behind a
white acrylic surface for distribution of the light.
Conventionally, these lamps have colour temperatures
between 3700-4800 K, which is not dimmable due to the
physical characteristics of fluorescent lamps. The lamps
also are the main design constraint, which would not let
thickness of the negatoscopes below a certain limit.
The negatoscope developed by the company uses Thin Film
Transistor Liquid Crystal Display (TFT LCD) technology
as the light source. These light sources are placed
behind a white acrylic surface, in order to distribute
the light uniformly. The company has its know-how for
this even distribution of light.
The lamps have a colour temperature of 9000 K, which
increases contrast and thus helps in easier reading of
X-ray films. The 40,000 kHz flicker rate of the Cold
Cathode Fluorescent Lamps (CCFL) used reduces eyestrain,
which is an issue with the conventional fluorescent
lights. The life of the lamps is as high as 20,000
hours.
Since the standard thick fluorescent lamps are not used,
it is possible to reduce the thickness and weight of the
negatoscope. The company’s design is 26mm thick, which
results in a system like a picture frame.
The system has acquired CE-marking. It is currently on
the market in 3 sizes, in parallel with the standard
film sizes. This can easily be modified to more
variations, upon market requirements.
The company is open to discussing all types of
cooperation. This may include technical cooperation,
licensing agreements or joint ventures.
Innovative Aspects:
- The using of CCFLs in lieu of standard fluorescent
lamps has improved functionality significantly: The
higher temperature light (9000 K) emitted by the CCFLs
helps in obtaining higher contrasts, therefore easier
examination of the X-ray films.
- The 40,000 times/sec (40 kHz) flickering rate is much
more convenient for the human eye.
- The thin (26 mm thick) design allows the negatoscope
to be light in weight, and placed simply everywhere like
a picture frame.
Main Advantages:
- The light emitted by the CCFLs is much more convenient
for reading X-ray films.
- Due to its compact design (being much thinner and
lighter), it is easily mountable to any wall, without
the need to additional reinforcements.
- The thin design provides a modern and aesthetic look
in the hospitals and doctors’ offices.
- The described technology is provided in a very
competitive price range. |
| Article Source: |
| http://www.invenia.es/tech:05_tr_taot_0bzs |
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Superlite Series II X-Ray Viewers |
A premium quality range
of viewers featuring superb workmanship & attractive
finish.
·High
Quality 15-watt daylight fluorescent tubes with a colour
temperature of 6500° K provide a bright & even spread of
light.
·Transparent
spring loaded film retainers grip lightly & firmly
without obscuring top edge details.
·Rigid
welded steel construction finished in white enamel with
stainless steel trim.
·Screen
is recessed into the cabinet to help keep the interior
dust free and eliminate side light spill.
·Flicker-free
as standard.
·Available
as a single unit. The 2 Way, 3 Way and 4 Way options can
be purchased in single or double bank (2 tier) models.
Important Design Feature
The front opal acrylic screen is not fixed directly to
the cabinet and is free to move. This innovative design
eliminates screen distortion due to thermal expansion.
This means that the film retainers always operate
effectively maintaining an even pressure across the full
width of the illuminator.
Option:
In-Screen High Intensity Spotlight - a defined spot
factory fitted to any viewer.
An internal 12v 50w bulb casts a defined spotlight onto
the centre of a 35 x 43cm film area.
The push button activated tungsten halogen bulb is
normally in the right hand screen
In-Screen Spotlight. Please specify required film area
for the spotlight |
| Article Source: |
| http://wardray-premise.com/accessories/viewers/superlite.html |
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Wall X-Ray Viewers |
Durable anodized
aluminium finish
Lightweight, streamline design
Recessed perspex panel
Long-lasting
Dimensions single viewer approx 375W x 482H x 112D
Available Single, Double ($338), Triple ($500) or
Quadruple ($665)
Wall X-Ray Viewers Durable anodized aluminium finish
Lightweight, streamline design Recessed perspex panel
Long-lasting Available Single, Double ($306), Triple
($459) or Quadruple ($612)
Also available recessed wall models (ie sit flush with
wall) & mobile models - Please phone for pricing on
these models. |
| Article Source: |
| http://www.warnerwebster.com.au/view/262 |
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