JPH02134628A - Irradiating device for light transmissive original - Google Patents

Abstract

PURPOSE:To rapidly scan-expose a satisfactorily recorded picture with respect to a transmissive original by irradiating the original with a light from a halogen lamp after the light passes through a light diffusion plate and making the light incident on a slit. CONSTITUTION:The title device is provided with the halogen lamp 120 which is a light source of the same length as that of the slit, reflecting plate 122 which is arranged on a position enclosing the halogen lamp 120 and reflects light only toward the direction of the slit, the diffusion plate 124 which is formed integrally with the reflecting plate 122 and the halogen lamp 120 and diffuses light toward the slit. That is, the light from the halogen lamp 120 passes through the diffusion plate 124, irradiates the original and is made incident on the slit. Therefore, the light forming a filament as an image is diffused by the diffusion plate 124 and made incident on the slit. As the result, an image made incident on the slit is only the image of the original. Therefore, a satisfactorily recorded image can be scanned and exposed rapidly with respect to the transmissive original.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an irradiation device for a light-transmissive document of a slit scanning type copying device.

[Conventional technology]

Examples of light-transmissive materials include materials for ordinary photographic film, X-ray photography, and OHP (over head projector).

In addition to copying images using light-reflecting materials, there are image recording apparatuses that copy images using such light-transmitting materials.

Among these, for example, there is an automatic developing device that uses silver halide photographic light-sensitive materials, which uses a scanning exposure system to scan an original and imagewise expose the recording material to a developing tank, a fixing tank,
The image is obtained by passing through a cleaning tank and drying.

In a light reflection type scanning exposure system, a document is placed on a transparent document table with a document holder, a light source is placed close to and integrated with the scanning slit, and scanning is performed by moving the document or the slit. .

On the other hand, when using a light-transmitting type document, the light-reflecting type document holder is replaced with a slide projector-type irradiation device, and the image light transmitted through the document is scanned by this irradiation device. There is an irradiation device that irradiates the entire platen from above the document, and instead places a light-transmissive document on the platen and scans the transmitted light from the document.

[Problem to be solved by the invention]

With the above-mentioned slide projector type irradiation device, it is difficult to increase the light irradiation area on the original, so it is difficult to scan many large-area originals at once. It is almost impossible to irradiate the entire surface of a document with a similar large area using a slide projector.

Therefore, by using the irradiation device that irradiates the entire platen from above the document as described above, it is possible to record an image on a light-transmitting document having a large area. However, many light-transmissive materials are sensitive to temperature, and in this case, the document and light source are close to each other, and with a fluorescent light source, the irradiation time is long (and the document deforms due to temperature, making it impossible to use it again). It ends up.

Although it is conceivable to move a fluorescent light source in synchronization with the scanning exposure slit, since the amount of light produced by the fluorescent light source is small, the irradiation time becomes too long, which is impractical. If a halogen lamp is used as the light source, the irradiation time can be shortened, but since a halogen lamp emits light from a filament, a problem arises in that the image of the filament that passes through the document is directly exposed to the photosensitive material.

This phenomenon is particularly noticeable when using photosensitive materials containing silver salts because of their high sensitivity.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a transparent original irradiation device that can quickly scan and expose a good recorded image to a transparent original.

[Means and Effects for Solving the Problems] The above object of the present invention is to provide a light-transmitting document irradiation device for a slit scanning type copying device, which includes a halogen lamp as a light source having a length equivalent to the slit; a reflecting plate arranged to surround the halogen lamp and reflecting light only in the direction of the slit;
This is achieved by a light-transmissive document irradiation device that includes the reflector and a diffuser plate that is integrated with the halogen lamp and converts the light to the slit into diffused light.

That is, the light from the halogen lamp passes through the diffuser plate, irradiates the document, and enters the slit, so the light that forms the filament as an image is scattered by the diffuser plate and then enters the slit. The image that enters the slit and therefore enters the slit is only the image of the document.

[Embodiment]

Next, preferred embodiments of the light-transmitting document irradiation device according to the present invention will be described in detail with reference to the accompanying drawings.

In the description of the embodiments, in order to facilitate understanding of the invention, the structure and operation of the entire image recording apparatus to which the light-transmissive document irradiation device is applied will be explained, and then the main parts will be explained.

FIG. 1 is a schematic diagram of an image recording apparatus to which a light-transmissive document irradiation device according to an embodiment of the present invention is applied.

In this embodiment, an image recording apparatus using a silver halide photographic light-sensitive material is used as the light-sensitive material, but the present invention is not limited thereto.

A paper feed section 12 is provided on the right side of the image recording apparatus main body 10, an exposure section 14 and a processing section 16 are provided above, and a drying section 18 is provided on the left side.

On the right side of the main body 10, there are a pair of magazines 20 and 22 located above and below.
The photosensitive materials 24 and 26 are stored in rolls inside these, and are taken out from the leading end to the paper feed section 12.

As an example, the photosensitive material 24 is a photosensitive material most suitable for copying color film originals, and the photosensitive material 26 is a photosensitive material most suitable for copying color print originals.

The photosensitive material 24 or 26 drawn out from the magazine 20.22 is sent through the paper feed section 12 to the exposure window 28. Then, an image of a color original 32 placed on a transparent original table 30 provided above the exposure section 14 is exposed.

The color original 32 is connected to the light-transmitting original irradiation device 1, which will be described in detail later.
Exposure lamp unit 1 in the light-transmissive document irradiation device 100 is pressed onto the document table 30 by 00 and moves in synchronization with the scanning of the reflective recording light source unit 36 directly below the document table 30.
10. Then, the transmitted light forming an image from the color original 32 is reflected by a plurality of mirrors 40,
The photosensitive material 24 which has passed through the optical unit 42 and is located at the exposure window 28 by opening the shutter 44. Or expose 26.

The optical unit 42 is composed of a condenser lens and a plurality of filters of yellow, magenta, cyan, etc., for example.

A switching guide 50 is provided in the middle of the withdrawal trajectory of the photosensitive material 24 (or 26) (after passing through the exposure window 28), and when all exposure is completed, the photosensitive material 24 (or 26) to be sent downward is provided with a switching guide 50. is temporally moved in the opposite direction, and further its leading end is stopped upstream of the switching guide 50, and the photosensitive material 24 (or 26) is transferred to the processing section 16.
The switching guide 50 can change direction so as to be guided to.

In the processing section 16, a developing tank 46. Bleach/fix tank 47, 1st
Water tank 48. A second water tank 49 is provided continuously, and the photosensitive material 24 (or 26), which has been developed, bleached, fixed, and washed by the processing liquid filled into the tank, is sent to the drying section 18. It has become.

Further, the developer tank 46. Bleaching/fixing tank 47. 1st water tank 4
8. The second water tank 49 has a replenishment tank 60.62, respectively.
．． 64 is provided to replenish various types of replenishment liquid as necessary.

In the drying section 18, the photosensitive material 24 (or 26) after washing with water
is dried and sent onto a take-out tray 54.

As described above, a series of operations such as exposure, development, fixing, and drying are performed, and the original image is recorded on the photosensitive material 24 (or 26).

FIG. 2 shows a schematic perspective view of the light-transmitting document irradiation device.

This light-transmitting document irradiation device 100 includes a casing 102
The exposure lamp unit 110 is constructed of a guide guide 104 and a sliding shaft 106 on both ends thereof, and an exposure lamp unit 110 bridged between the guide guide 104 and the sliding shaft 106 so as to be slidable in the longitudinal direction thereof. . A transparent plate 108 (made of glass, acrylic, etc.) facing the color original 32 is fitted into the lower part of the casing 102. sliding shaft 1
A step motor 112 equipped with a pulley is disposed at one end position of the sliding shaft 106 on the opposite side of the exposure lamp unit 110 with 06 as the center, and a step motor 112 equipped with a pulley is disposed at the other end position.
The timing belt 116 has approximately the same length in the longitudinal direction of 6.
is being strung up.

One end of the exposure lamp unit 110 is fixed to a predetermined position of the timing belt 116, and the exposure lamp unit 110 is scanned by a step motor 112.

This light-transmissive document irradiation device 100 is removably placed at a preset position on the document table 30.
It can be applied to a reflective image recording device as shown in the figure. This setting position is set so that the scanning start position of the step motor 112 of the exposure lamp unit 110 and the scanning start position of the reflective recording light source unit 36 coincide.

Then, as described above, by controlling the step motor 112 to scan the exposure lamp unit 110 in synchronization with the scanning of the reflective recording light source unit 36, the image of the document is reflected by the slit of the reflective recording light source unit 36. is irradiated to.

FIG. 3 shows a sectional view of the exposure lamp unit.

The exposure lamp unit 110 is a rod-shaped halogen lamp 120
A reflector plate 122 surrounds the rod-shaped halogen lamp 120 in a U-shape, and a diffuser plate 124 is fixed to the U-shaped opening of the reflector plate 122.

The U-shaped opening of the reflection plate 122 faces toward the transparent plate 108, and the light from the halogen lamp 120 directed toward the original 32 becomes diffused light. In other words, if the diffuser plate 124 is not provided, direct light from the halogen lamp 120 that would form a filament image on the photosensitive material will be scattered by the diffuser plate 124, and only the image of the document 32 will be recorded on the photosensitive material. Ru.

Photosensitive materials that use silver salt have high sensitivity and produce clear filament images, so such a diffuser plate 1
24 is particularly effective.

By using a halogen lamp, the required amount of light can be obtained in a short time. Also, exposure lamp unit) 11
Since 0 is being scanned, considering a part of the document 32, the heat generated from the halogen lamp is applied only for a very short time, so that the document 32 is not deformed or deteriorated by heat.

Furthermore, as heat countermeasures, heat insulating glass may be provided between the halogen lamp 120 and the diffuser plate 124 in the exposure lamp unit 110, and a cooling fan may be provided at an appropriate location in the casing 102.

Note that the above-described exposure lamp unit can also be used as an irradiation unit for reflective type originals.

In addition to the image recording apparatus in this embodiment, any apparatus using a scanning exposure optical system may be used.

〔Effect of the invention〕

In the light transmitting document irradiation device of the present invention, the light from the halogen lamp passes through the diffusion plate and then irradiates the document and enters the slit. The direct light that forms a filament image on the photosensitive material is scattered by the diffuser plate, and only the image of the original is recorded on the photosensitive material, making it possible to quickly scan and expose a good recorded image to a transmissive original. .

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an image recording apparatus equipped with an irradiation device for light-transmitting originals according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of the irradiation device for light-transmitting originals, and FIG. 3 is an exposure lamp. FIG. 3 is a sectional view of the unit. Reference numbers in the figure: 10 Main body 12 Paper feeding section 14/exposure section 16 Processing section 18 Drying section 2
0.22 Magazine 24.26--Photosensitive material 2
8 M optical window 30-document table 32 document document holder 38. Light source mirror optical unit 46--Developer tank bleach-fix tank 48.49 -Washing tank switching guide 54. Take-out tray 0 Light-transmitting original irradiation device 2 Casing 104-Guide 6 Sliding shaft 108 Transparent plate 0 Exposure lamp unit 2 Step motor 114- Pulley 6 Timing belt 0 Halogen lamp 122 Reflector plate 4 Diffusion plate 2nd figure, 3rd figure

Claims (1)

[Claims] The irradiation device for light-transmissive originals of a slit scanning type copying device includes a halogen lamp as a light source with the same length as the slit, and a halogen lamp placed in a position surrounding the halogen lamp to reflect light only in the direction of the slit. A light-transmissive document irradiation device comprising: a reflecting plate; and a diffusing plate, which is integrated with the reflecting plate and the halogen lamp and makes light directed to the slit diffused light.