JPH02134629A - Original irradiating device - Google Patents

Abstract

PURPOSE:To irradiate a scan slit with the sufficient quantity of light by providing a light source having the same length as an exposing slit and a reflecting plate which is arranged to surround the light source like a bell and reflects uniformly light wider than a slit width in the slit direction. CONSTITUTION:An exposure lamp unit is composed of a rod halogen lamp 120, the bell-shaped reflecting plate 122 surrounding the rod halogen lamp 120 and a diffusion plate 124 fixed to the bell-shaped opening part of the reflecting plate 122. The exposure lamp unit 110 is always arranged right above a slit 37. The width of the diffusion plate of the bell-shaped opening part of reflecting plate 122 is set wider than that of the slit 37. Therefore, even when out of synchronism and errors in moving accuracy arise between the exposure lamp slit and the scan slit, the scan slit can be irradiated with sufficient quantity of light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an original irradiation device for an exposure slit scanning type copying apparatus that can use transmission type originals and reflective type originals.

[Conventional technology]

Light-transmissive materials include materials for ordinary photographic film, X-ray photography, and ○HP (overhead projector).

In addition to copying images using light-reflecting materials, there are image recording apparatuses that can 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 original, the original holder is replaced with a slide projector-type irradiation device, and this irradiation device scans the image light transmitted through the original. Some scan the transmitted light from the entire document by installing an irradiation device that illuminates the entire transparent document table from above the document. Furthermore, there is a method in which an irradiation device including a light source that moves in synchronization with the scanning slit is installed.

[Problem to be solved by the invention]

As described above, in an irradiation device equipped with a light source that moves in synchronization with the scanning slit, the light source only partially irradiates the document, so the initial alignment between the scanning slit and the light source may be misaligned, or the start timing of movement may be shifted. Due to synchronization errors such as this, the irradiated light from the light source does not sufficiently pass through the slit, which causes density unevenness to occur in the recorded image due to insufficient light amount.

Furthermore, similar problems occur in that density unevenness occurs even if errors in movement accuracy occur, such as a shift in the moving speed of the scanning slit and the light source, or a twisted position in the parallel direction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a document irradiation device that can irradiate a scanning slit with a sufficient amount of light.

[Means and Effects for Solving the Problems] The above object of the present invention is to provide a document irradiation device for an exposure scanning slit type copying device, which comprises a light source having a length equivalent to that of the exposure slit; This is achieved by a document irradiation device having a reflecting plate arranged in a bell-shaped position surrounding the slit and reflecting light almost uniformly in the direction of the slit with a width wider than the slit width.

That is, by having a width wider than the width of the exposure scanning slit within a range in which the reflecting plate can almost uniformly reflect the light from the light source, even if the above-mentioned synchronization deviation or movement accuracy error occurs, the width of the scanning slit is sufficient. It is possible to irradiate an appropriate amount of light and obtain an image with good density.

[Embodiment]

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

In describing the embodiment, in order to facilitate understanding of the invention, the overall structure and operation of an image recording apparatus according to an embodiment to which the 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 in which a document irradiation device according to an embodiment of the present invention is applied to a transparent document.

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 transferred to a light-transmitting type original document projection 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 includes 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 conveyance 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 fed 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 includes replenishment tanks 60 and 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 a light transmission type document irradiation device.

This light transmission type 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 of the sliding shaft 106 on the opposite side of the exposure lamp unit 110 with the exposure lamp unit 110 as the center, and a pulley 114 is disposed at the other end. A timing belt 116 is stretched to have approximately the same length.

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 transmission type original irradiation device 100 is removably placed on a preset position on the original platen 30.
It can be applied to a reflection type image recording device like this embodiment. This set position is set so that the scan start position of the exposure lamp unit 110 by the step motor 112 and the scan 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. 37
is irradiated to.

FIG. 3 is a sectional view showing the positional relationship between the exposure lamp unit and the reflective recording light source unit.

The exposure lamp unit 110 is a rod-shaped halogen lamp 120
, a reflecting plate 122 that surrounds the bar-shaped halogen lamp 120 in a bell shape, and a diffuser plate 124 fixed to the bell-shaped opening of the reflecting plate 122. The width of the diffuser plate 124, which is the light irradiation part, is set to about 30 mm, and the exposure lamp unit 110 always moves to the scanning start position of the slit 37 of the reflective recording light source unit 36 and during the scanning movement. placed almost directly above.

A range of about ±5 mm is required to allow for all errors, such as manufacturing errors and deviations in synchronization and movement accuracy of the exposure lamp unit 110 with respect to the slit 37, but the width of the slit 37 is usually about 10 mm. Between the width of the diffuser plate 124 portion and the width of the slit 37, there is a sufficient tolerance range of approximately ±10 mm for each of the above-mentioned errors.

Here, the width of the diffuser plate 124 of the bell-shaped opening of the reflection plate 122, which is the light irradiation part, should be wider than the width of the slit 37, but it is better to use the rod-shaped halogen lamp 120 or the same width. When using a light source with a light intensity of , if the width is too wide, uneven illumination will occur. Furthermore, to prevent uneven irradiation, increase the number of light sources and widen the width (this will lengthen the irradiation time to any part of the document, increasing the amount of heat to the document and deforming the document.In addition, the power consumption will also increase. It will increase.

Therefore, the optimal width of the diffuser plate 1240 of the bell-shaped opening of the reflection plate 122, which is the light irradiation part, is about 3Q mm as described above.

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 document irradiation device of the present invention, an exposure lamp unit includes a reflecting plate that is arranged in a position surrounding the light source in a bell shape and reflects light almost uniformly in the direction of the slit with a width wider than the slit width. Even if the above-mentioned synchronization deviation or movement accuracy error occurs between the exposure lamp unit and the scanning slit, the scanning slit can be irradiated with a sufficient amount of light, and an image with good density can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an image recording apparatus equipped with an original irradiation device according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a light transmission type original irradiation device, and FIG. 3 is an exposure lamp unit and FIG. 3 is a cross-sectional view showing the positional relationship with a reflective light source 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 28
Exposure window 30 Original table 32 Original 34
Original holder 37 Slit 36 Reflective light source unit 38 - Light source 40 Mirror - 42 Optical unit 46 Developing tank 47 - Bleach-fixing tank 48.49 Washing tank 5〇 - Switching guide 54 - Take-out tray 100 Light-transmissive original irradiation device 102 Casing 104 Guide 106
Sliding shaft 108 Transparent plate 11〇-Exposure lamp unit 112 Step motor 114 Pulley 116
Timing belt 120 Halogen lamp 122-Reflector plate 124 Diffusion plate Fig. 2

Claims (1)

[Claims] A document irradiation device for an exposure scanning slit type copying device, which includes a light source having the same length as the exposure slit, and a light source arranged in a position surrounding the light source in a bell shape so as to extend in the direction of the slit so as to be wider than the slit width. A document irradiation device that includes a reflecting plate that reflects light almost uniformly over a wide width.