JPS59139544A - Vacuum fluorescent lamp for luminous source - Google Patents

Abstract

PURPOSE:To obtain the one that is of a small size but provides a high illuminance on the surface of the original, by providing a slit in a light-transmitting anode conductive member formed on the underside of a light-transmitting substrate disposed just under the surface of the original, by spreading a phosphor layer over the anode conductive member for emitting light by the bombardment of the electrons from the opposing cathode, and by making photoelectrical conversion of the reflected light from the surface of the original through the slit. CONSTITUTION:A light-transmitting anode conductive member 7 formed of a transparent film of ITO or Nesa film is provided on the underside of a light-transmitting insulative substrate 3. The anode conductive member 7 is provided with a slit 8 in the middle thereof for passing the reflected light from the surface of the original 2a therethrough and is provided with a thin phosphor layer 9 spread over its underside. A backside plate 5 of an insulative material is provided with a light-shielding conductive member 14 disposed on its inner side. The phosphor layer 9 emits light by the bombardment of thermions emitted by the cathodes 11 while the original 2 is shifted in the direction as indicated by the arrow, and then the surface of the original 2a is evenly illuminated by the light coming through the anode conductive member 7, the substrate 3, and the original receiving plate p, and the reflected light is led through the slit 8 in the anode member 7, a slit 15 in the light-shielding conductive member 14, and the backside plate 5 so as to be condensed and photoelectrically converted in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an original and a vacuum front light tube for a light source used as a light source of a photoelectric conversion device that is equipped with a photoelectric converter in which a light source that irradiates the original performs relative electric conversion.

Generally, a photoelectric conversion device used in a copying machine, a facsimile transmitter, etc. continuously feeds a document, irradiates the surface of the document with a light lamp, and performs photoelectric conversion of the reflected light in a light receiving system. That is, photoelectric conversion is performed by projecting and forming an image on an image sensor using a phototransmitting element array.

However, conventional devices that use fluorescent lamps as light sources have the following drawbacks.

(1) Fluorescent lamps have a short lifespan, requiring frequent replacement of fluorescent lamps, and maintenance costs are high.

(2) The manufacturing cost of fluorescent lamps is high.

(3) It is unavoidable that the luminance decreases at both ends of the fluorescent lamp, that is, the part where the electrodes are installed. Therefore, in order to irradiate the document with uniform illuminance, a large type with a long irradiation length is required. I need.

(4) Install large fluorescent lamps close to each other so that the distance between the light-emitting surface of the fluorescent lamp and the document is small.
, a decrease in illuminance occurs on the document surface.

(5) In this way, a fluorescent lamp lighting device is required.
If a fluorescent lamp is used as a light source, there are problems in that maintenance of the photoelectric conversion device is required, the size of the device cannot be avoided, and the illuminance on the document surface cannot be increased.

On the other hand, it has been proposed to use a round tube-shaped light-resistant tube as a light source, but the round tube-shaped light-resistant tube has an extremely complex structure and is not easy to manufacture. It is difficult to form an anode and a photoreflector layer on the anode, and it is also difficult to form all the slits on the anode to guide light reflected from the document surface. Furthermore, the distance between the light-emitting surface of the round fluorescent tube and the document surface cannot be made small due to the structure of the round tube, and the illuminance on the document surface decreases as in the case of fluorescent lamps.

This invention has been made in view of the above points, and has a simple structure, fewer failures, and can be made smaller.
To provide a long-life vacuum front light tube for a light source that can increase the illuminance on the document surface by minimizing the distance between the document surface and the light emitting surface.

Therefore, in order to achieve this object, the present invention provides a photoelectric conversion device in which an original and a light source that illuminates the original move relative to each other, and the light reflected from the original is focused in a light receiving system to perform photoelectric conversion. A vacuum front light tube for a light source used as a light source for a photoelectric conversion device equipped with a light source, in which a transparent insulating substrate is disposed directly below the surface of the original, and a transparent anode conductor is disposed inside the insulating substrate. The anode conductor is formed in a longitudinal strip pattern, with slits formed in the longitudinal direction of the anode conductor, and a cathode provided on the anode conductor opposite to the anode conductor. A quasi-phosphor layer that emits light is deposited, and 1b'iK of the phosphor layer and the light-receiving system located below the phosphor layer is a light-shielding structure having a slit at a position opposite to the slit of the anode conductor. The anode conductor, the glory body layer, and the cathode are sealed in a completely vacuum atmosphere by a container part having the insulating substrate and a back plate facing the insulating substrate, in which the anode conductor, the glory body layer, and the cathode are sealed in a completely vacuum atmosphere. The characteristic is to form an enclosure.

EMBODIMENT OF THE INVENTION Hereinafter, the vacuum tube for source use of this invention will be explained with reference to an embodiment shown in the drawings.

FIG. 1 is a plan view showing a vacuum front light tube 1 for a light source (hereinafter referred to as a vacuum light tube) according to the present invention, and FIG. 2 is a plan view showing a vacuum front light tube 1 for a light source according to the present invention, and FIG. 2 is a cross-sectional view of the vacuum fluorescent tube 1 used; 2 is a document placed on the substrate 3 of the vacuum fluorescent tube 1 with a translucent document tray placed through the plate p; 4 is a document placed on the substrate 3 of the vacuum fluorescent tube 1; A condenser lens 6 is provided below the back plate 5 and condenses the reflected light of the light irradiated onto the document 2 from the vacuum source tube 1; 6 is the condenser lens 4;
This is an image sensor that charges and converts the reflected light from the document surface 2a that is collected by the image sensor.

To explain the structure of the above-mentioned air-cutting source tube 1 in detail, the substrate 3 is a light-transmitting insulating substrate formed of transparent to semi-transparent glass into a long plate shape as shown in Fig. 1. On the inside of 3, I
Transparent conductive films such as TO and Nesa film! A light-shielding anode conductor 7 consisting of 1. This anode conductor 7
As shown in FIG. 3 and FIG. 3, a slit 8 is provided along the longitudinal direction of the anode conductor 7, preferably near the center, through which all the reflected light from the document surface 2a passes. The anode conductor 7 is electrically connected by a wiring conductor 7a made of a transparent conductive film, and the circular surface of the anode conductor 70 is covered with a thin optical layer 9. The widths of the anode conductor 7 and the phosphor shield 9 in the longitudinal direction are approximately the same as the left and right width L2 in the feeding direction of the original 2, as shown in FIG. . and,
The anode conductor 7 is located between the cathode support portions 10 and 10 at both ends.
A plurality of cathodes 11 are suspended in tension so as to face each other. Note that the cathode 11 may have a filament shape or a planar shape.

On the other hand, the back plate 5 and side plates 12 and 12 that make up the entire container part
, 13.13 are made of various materials, but the back plate 5 is made of a transparent to semi-transparent insulating material, and the side plates 12, 12, 13.13 are made of a transparent to opaque insulating material. A light-shielding conductor 14 as a light-shielding mask is adhered to the same side of the back plate 5.

This light-shielding conductor 14 is made of A7, Cr I Ni I
A thin replica of metal such as Af is coated by vapor deposition, etc., and can completely prevent pulp charge inside the vacuum intensifier tube 1.
That is, the surface facing the first light layer 9 is a mirror surface 14a, and a slit 15 is provided in the center of the light-shielding conductor 14 along its longitudinal direction. This slit 15, the condensing lens 4 and the image sensor 6
The slit is used as a mask for the light receiving system, and is opposed to the slit 8 of the anode conductor 7, and the slit length is approximately equal to the slit length of the slit 8.

Thus, the substrate 3 and the back plate 5 are connected to the side plates 12 and 13.
The anode conductor 7 and the cathode 11 are separated from each other through an envelope 18, and the envelope 18 is hermetically sealed so that the inside of the envelope B is evacuated and maintained in a high vacuum atmosphere. The vacuum optical tube 1 is of a front-emission type in which the phosphor layer 9 emits light through the anode conductor 7 toward the substrate 3.

A pair of anode terminals 16 and a pair of cathode terminals 17 are led out from the anode ceramic body 7 and the cathode support 10.10, respectively, to the outside of the envelope 18.

In the vacuum light tube 1 having the above-described structure, the thermoelectrons sent to the original 2 in the direction of the arrow in FIG. -9 is emitted, the anode conductor 7, the substrate 3' and the document holder pass through the plate p and the document surface 2a of the document 2 is emitted.
The source is uniformly irradiated, and the reflected light on the document surface 2a is
The light passes through the slit 8 of the anode substrate 7, the slit 1'5 of the light-shielding conductor 14, and the back plate 5, and is focused by the condensing lens 4, and the information on the document surface 2a is sequentially photoelectrically converted by the image sensor 6. Further, the light emitted from the faint light layer 9 to the rear plate 5- is reflected by the mirror surface 14aKl of the light-shielding conductor 14 and reaches the document surface 2a through the slit 8,
．． The light passes through 15e, is focused by a condensing lens 4, and is photoelectrically converted by an image sensor 6. Therefore, most of the light emitted from the first material layer 9 is irradiated onto the document r1112a by the mirror surface 14a of the light-shielding conductor 14, and the efficiency of using the light emitted is several percent compared to the case without the mirror surface 14a. It can be improved by ~10%.

In this embodiment, since the vacuum fluorescent tube 1 is of the front-emission type, the distance between the document surface 2a and the light-emitting surface of the vacuum fluorescent tube 1, that is, the forward light layer 9 can be made extremely close, and the document surface 2a It is possible to irradiate light with high illumination intensity and to achieve extremely high utilization efficiency of light emission. Moreover, it goes without saying that the narrower the slit width of the slit 15, the more the illuminance of the reflected light on the year lens 4 can be increased.

In addition, when the anode conductor 7 is formed entirely of transparent conductive material, it is possible to pass the reflected light on the document surface 2a without necessarily providing a slit, so that the transparent conductive material 7 is uniformly coated on the inner surface of the substrate 3. However, a phosphor layer may be applied except for the portion corresponding to the slit 8.

Further, the anode conductor 7 may be formed into a mesh shape with a conductive metal film such as AA, Cr, Au, Ag, etc. In this case, the reflector layer may be coated on the entire surface of the anode conductor 7. good.

Next, a second embodiment of the vacuum light tube for a light source according to this research will be described. This is a configuration of the vacuum ridge tube 118 of the second embodiment, and as shown in FIG. This is an example in which a light shielding plate 200 as a tracing mask is placed between the back plate 105 outside the envelope 118 and the condensing lens 104 instead of providing the slit 15. Various light-shielding materials are used, and a slit 210 is provided in the center at a position opposite to the slit 108 of the anode conductor 107. The pattern of the anode conductor 107 deposited on the substrate 103 has a rectangular shape with a slit 108 in the longitudinal direction at the center, as shown in FIG. It is thinly handled and has four anode terminals 116 outside the envelope 118.
It's being served.

The longitudinal shape f3) and 1llf% L3 of the anode conductor 107 and the two strong light body layers 109 are slightly longer than the left and right width L2 of the document 2 in the υ direction, as in the first embodiment. . That's lenient, the slit length needs to be at least the left and right width L2 of the document 2 in the feeding direction.

Therefore, the document surface 2 irradiated with light from the broken body layer 109
The reflected light at a is the slit 108, '210? : The condensing lens 104 (the light is condensed further and the image sensor 1
The received light is converted into electricity by 06.

Incidentally, the vacuum ordinary light tube for a light source according to the invention is not limited to the contents shown in the first and second embodiments, and various types can be considered.

As explained above, according to the present invention, a translucent insulating substrate is disposed directly below the surface of the original, and a translucent anode conductor having a slit in the operator's direction is arranged on the inside of the insulating substrate in the form of a longitudinal strip. At the same time, a phosphor layer that emits light by electrons from the cathode is formed on the anode 4 body, and the
A light-shielding mask with slits facing the slits of the four anodes is disposed between the slits of the four anodes and the light-receiving system. Since the envelope is constructed so that the body layer and the cathode are sealed and inserted in a vacuum atmosphere, the distance between the document surface and the light emitting surface can be minimized by being close to the entire document surface of the photoreceptor layer, which is the light emitting surface. This makes it possible to reduce the illuminance on the manuscript surface, which has high luminescence utilization efficiency, and the anode conductor and phosphor layer, which are nine light surfaces, because the phosphor layer emits light evenly to both ends. Longitudinal formation: 1Iiit Even if you narrow the document feeding direction to the left and right sides, the light is evenly distributed on the right side of the document surface.
It is smaller than an unused fluorescent lamp that can irradiate light, and due to the presence of a translucent mask, light reflected from the document surface and unnecessary external light reach the light receiving system. Not only does it not cause any adverse effects on photoelectric conversion, it has a simple structure, so it has the advantage of having a long life, with fewer failures, and no maintenance required.

If you place a light-shielding mask on the back plate and shift the surface facing the positive conductor from the flawed surface, the back surface will be +1 from the one-sided light.
The light directed toward 11 can be reflected on the surface of the original fabric 14, which has the effect of further increasing the utilization efficiency of light emission.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a vacuum ordinary light tube for a light source according to the present invention, FIG. FIG. 4 is a cross-sectional view showing the second embodiment of the vacuum ordinary light tube for a light source according to the present invention, and FIG. FIG. 1 is a flat view showing a turn of an anode conductor. 1.101... Vacuum ordinary light tube for light source, 2... Manuscript, 2a
Original surface: 3, 103... Translucent insulating substrate, t
+, l Oq・Condensing lens, 5.105... Rear plate, 6.106... Image sensor as photoelectric conversion element, 7, 10'7... Transparent anode conductor, 8. Lo
8 slits, 9... photoreceptor layer, 11... cathode, 12
゜13 - Side plate, 14... Light shielding, 4 light shielding bodies as sex masks, 14a... Control surface, 15.210... S1
Knot, 18.118・・Envelope, 200・Shading・j
A light plate as a sexual mask. Patent applicant: Soki Electronics Industry Co., Ltd.

Claims (1)

[Scope of Claims] fi+ An optical converter in which the original and the light source that illuminates the original move relative to each other, and the light reflected from the original surface is focused in the light receiving system for photoelectric conversion. This is a vacuum value light tube for a light source used as a light source for a photoelectric dust converter equipped with The anode conductor is formed in the shape of a longitudinal strip, and a slit is formed in the longitudinal direction of the anode conductor. The phosphor layer is slightly removed by the arrow, and there is a gap between the slit of the anode conductor and the surrounding area between the phosphor 90 and the light receiving system located below it. A light-shielding mask having slits 3 at movable positions is disposed, and the anode conductor,
A vacuum fluorescent tube for a light source, characterized in that a polishing layer and a cathode are hermetically sealed in a full vacuum atmosphere to form an envelope. ! 21 riiJ The anode conductor is a transparent conductive film! l
1. A vacuum fluorescent tube for a light source according to Item 1 of the Patent Requested by JI'J. B();:j The vacuum layer light tube for a light source according to claim 1, wherein the anode conductor is made of a conductive metal film formed in a mesh shape. (4) The light-shielding mask is disposed on the back plate, and the surface facing the anode conductor is a light source vacuum fluorescent tube according to claim 1. 5) The vacuum fluorescent tube for a light source according to claim 1, wherein the light-shielding mask is disposed outside the envelope.