JPH0291631A - Projector for light transmissible original - Google Patents

Abstract

PURPOSE:To obtain an excellent copied image without unevenness in using a transparent original by providing a specified light quantity correction means in a light source for projecting the transparent original so that the irradiating light quantity may be nearly uniform all over the exposed surface. CONSTITUTION:The projector 14 for projecting the transparent original 111 such as a negative film etc., is constituted of the light source 112, an image- formation lens 120, a mirror 122, a Fresnel lens 124 and a focusing glass 126, etc. An original negative/positive CC correction filter 16 for correcting CC balance in accordance with the kind of the transparent original 111 and a light quantity correction filter 114 for correcting the irradiating light quantity on the exposed surface are arranged between the light source 112 and the transparent original 111. In the filter 114, the density gradient of achromatic color that the density gets lower from a center part to a peripheral part is given, so that the quantity of projected light on the exposed surface can be made nearly uniform all over the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a ;Fi transparent original projection device, which is used mainly when copying transparent originals such as slides and negatives in a copying apparatus.

<Prior Art> Generally, copying apparatuses copy original images of reflective originals such as printed originals. However, with the diversification of image information recording, there has been a strong demand for a copying apparatus that can easily copy a transparent original as an opaque copy image in the same way as a reflective original.

In order to copy various types of transparent originals such as slides, negative films, microfilms, etc., a transparent original consists of a slide projector, a reflective member, an imaging member, etc. for projecting a projected image onto the document table of a copying device. The projection device is each f! ! Proposed.

However, when a relatively large projection device, especially a slide projector, is used in such a transparent original projection device, a part of the device is installed so as to protrude from the main body of the copying device.
Many of them cannot be used unless they are provided with an external support member, which limits the installation location of the copying device and also poses problems in operability.

In addition, the entire device of such a transparent original projection device is not shielded from light, and although an electrophotographic copying device can obtain a decent copy image, it is not sensitive to light like a silver halide photocopying device. In a copying apparatus using such a photosensitive material, flare or the like occurs in a copy image obtained due to the influence of external light, making it impossible to obtain a good copy image.

On the other hand, it basically consists of a slide projector and an imaging member for forming an image of transmitted light from the slide projector, and by shortening the focal length of the imaging lens of the slide projector, the original image is A transmission document projection device has also been proposed in which the entire device is miniaturized by shortening the distance between the image forming device and the image forming device, and is unitized within a light-shielding box.

Although the magnification of the transparent original by the unit itself is small, this transparent original projector forms a projected image on the original table using an imaging member such as a focusing glass, and uses the projected light to project images onto photosensitive materials. By exposing the image to light, it is possible to enlarge or reduce the image in the main body of the copying apparatus during copying, and it is possible to obtain a copy image that is sufficiently enlarged or reduced with respect to the original.

In addition, since the entire unit is light-shielded, it is possible to obtain good copied images without being affected by external light even when applied to a copying machine that uses photosensitive materials sensitive to light such as silver halide photosensitive materials. be able to.

<Problems to be Solved by the Invention> Incidentally, the amount of projection light from such a transparent original projector decreases from the center of the projection light beam toward the periphery, and is uniform over the entire exposed surface of the copying device. It is not possible to expose photosensitive materials etc. with a certain amount of exposure light.

In other words, when copying a transparent original using such a transparent original projecting device, the projection light of the transparent original normally passes through two imaging lenses of the transparent original projecting device and the copying device. If you look at the imaging lens from the periphery of the light beam, the round window of the lens becomes oblique and its area decreases, creating an elliptical shape, which is the same as the apparent aperture decreasing.

Furthermore, since the light reaching the periphery travels a longer distance than the light reaching the center, it is weakened in inverse proportion to the square of the distance.

Furthermore, the light in the central part is incident perpendicularly to the image forming surface and the exposure surface of the imaging member, but the light in the peripheral part is incident obliquely.
More light is reflected than the incident light, and the amount of light actually involved in exposure decreases.

Due to these three conditions, when copying a transparent original using a conventional transparent original projector, the amount of exposure at the periphery of the exposure surface is lower than that at the center, and uniform exposure is achieved over the entire surface. Since this is not carried out, the resulting copied image will be an image whose peripheral areas are underexposed compared to the central area, making it impossible to obtain a good copied image.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to produce a uniform copy image over the entire surface with no difference in exposure between the center and the periphery when copying a transparent original using a copying device. An object of the present invention is to provide a transparent original projection device that can be obtained.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a transparent original projection device used when copying a transparent original with a copying device, which includes a projection light source for projecting a transparent original. and a support means for the transparent original; an imaging lens; an imaging member for forming a projected image of the transparent original; and a focusing means, Provided is a transparent original projection device characterized by having a light amount correction means for correcting the light amount so that the amount of projection light from a light source is substantially uniform over the entire surface.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a transparent original projection apparatus according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of an embodiment of a transparent original projection apparatus of the present invention.

The transparent original projection device 14 shown in FIG.
When copying 11, it is used, for example, by being placed on the exposure unit 18 of the main body of the copying apparatus, and includes a projection light source 112 for projecting the transparent original 111, and a projection light source 112 for projecting the transparent original 111, and a projection light source 112 for projecting the transparent original 111 at a predetermined position in the projection optical path. an imaging lens 120 that serves as a focusing means and is movable six times forward and backward in the direction in which the projection light travels; and a mirror 122 that reflects the projection light onto an imaging member. , transparent manuscript 11
It has a Fresnel lens 124 and a focusing glass 126 as an imaging member for forming one projected image.

A transparent original projection device 1 of the present invention shown in FIG.
4, the most characteristic point of the present invention is that the projection light source 112 and the transparent original 111 are provided with an original negative/positive CC correction filter 116 for correcting the CC balance according to the type of the transparent original 111. A light amount correction filter 114 is arranged as a light amount correction means for correcting the amount of light so that a certain exposure surface has a substantially uniform amount of light over the entire surface.

In the transparent original projection device 14 shown in FIG. 1, these are arranged as a unit in a light-shielding box 130.

Any light source can be used as the projection light source 112 as long as it can form a projected image of the projected original image on the focusing glass 126 placed on the original platen 80 with transmitted light having an amount of light sufficient to expose the photosensitive material. Well, usually halogen lamp,
A xenon lamp or the like is used.

Note that the projection light source 11 is located behind the projection light source 112 (hereinafter, "front" refers to the front in the projection light traveling direction).
A reflector 113 is arranged to improve the light collection efficiency of 2.

The light intensity correction filter 114 is the most characteristic member of the present invention, and is configured to allow the projected light of the projected image that is re-imaged on the exposure surface of the copying machine to expose the photosensitive material etc. to the center and peripheral areas of the exposure surface. A light amount correction means for correcting the light amount so that the light amount is almost uniform over the entire surface with no difference in light amount,
For example, it is a filter with an achromatic color gradient such that the density decreases from the center toward the periphery.

As described above, the amount of light of the projected image decreases from the center of the luminous flux toward the periphery. Here, this decrease in the amount of light is proportional to cos' θ, where θ is the angle formed by the optical axis and a line connecting the center of the imaging lens and the periphery of the projected image.

If the illuminance on the optical axis of the projected image is EQ, and the illuminance at a point where the line connecting the optical axis, the center of the imaging lens, and the image plane is shifted by 0 degrees is Eo, then Eo and E. , i.e., the specific image plane illuminance R
, is expressed as Re = Ee /Eo = Ve cos'θ, which is proportional to eO8'θ, and is called the cos fourth law. Here, v8 is the aperture efficiency of the lens.

In the transmission original projector of the present invention, this c
The amount of projection light is corrected according to the os fourth law, and in the example shown in FIG.
By correcting the amount of light irradiated from the projection light source 112 using an achromatic light amount correction filter 114 whose density decreases from the center to the periphery according to the fourth power law, the amount of projection light on the exposure surface can be adjusted. To make the amount of light almost uniform over the entire surface.

The specific image plane illuminance Rs at the imaging member of the transmission original projector or the exposure surface of the copying machine depends on the projection light source 112, the imaging lens 120, the light amount correction filter 114, the CC correction filter 116, the imaging member, etc. used. Since it differs depending on the copying device to which it is applied, such a light amount correction filter 1
14, the difference in the amount of light correction between the center and the periphery, the difference in the amount of correction between the vertical and horizontal directions, the gradient of density change, the CC balance, etc., are determined by the characteristics of the projection light source 112 and the imaging lens 120. , may be determined as appropriate depending on the exposure method of the applied copying apparatus.

For example, when the exposure method of the applied copying device is slit scanning exposure, the projected image obtained on the imaging member is centered in the slit width direction in order to make the amount of projection light of the projected image uniform on the exposure surface of the copying device. The amount of light increases in the width direction from
The projected image may have a substantially uniform amount of light in the scanning direction.

In the example shown in FIG. 1, the light amount correction filter 11
4 is arranged in front of the projection light source 112, but the present invention is not limited to this, and the light amount can be appropriately corrected in front of the imaging lens 120, the mirror 122, the imaging member, etc. As long as it is a location, there are no restrictions on its placement position.

However, in order to make the appropriately corrected projection light enter the imaging lens 120, the light amount correction filter 114 is preferably placed behind the imaging lens 120.

The light amount correction filter 114 used is a filter with an achromatic density gradient whose density changes according to the correction of the light amount, and is made of a transparent material such as glass, etc., on which metal vapor deposition is applied, or a thin metal plate. A mask that has been etched like a shadow mask can be used.

Furthermore, the configuration may be such that various filters can be replaced depending on the copying apparatus to be applied and the type of transparent original, and furthermore, a plurality of filters may be used.

In addition, the method of correcting the amount of light in the present invention is not limited to the method using the light amount filter 114, but also the method of giving the projection light source 112 itself a correction effect in accordance with the cos fourth law, that is, the method of correcting the amount of light in the peripheral area using a rod-shaped lamp. In addition, there is a method in which the image forming member is provided with a filter with an achromatic color density gradient as described above, and a means for correcting the amount of light is provided in the slit width direction. Any method that can make the amount of light substantially uniform over the entire surface can be applied.

The negative/positive CC correction filter 116 adjusts the CC balance of the projected original image formed on the focusing glass 126 according to the negative/positive, since the CC balance is different between a negative and a positive, for example, a negative film and a slide. Replacing the filter.

The transparent original support means 118 is used for both negative and positive purposes.
For example, in the case of a positive slide, the frame is configured to slide vertically or horizontally one frame at a time using a known slide loading means. It is structured so that the negative holder can be slid vertically or horizontally after loading it (overseas 4 frames).

Note that in the present invention, the method of supporting a transparent original is not limited to this method, and any known method of supporting a transparent original can be applied.

The imaging lens 120 is a lens for forming a projected image with a transmission thickness f14t11 on an imaging member, and as a focusing means, a known method (not shown) is used in the forward and backward direction of the projection light, for example, using a rack and pinion. It is possible. Note that in the present invention, the focusing means is not limited to the method using six movements of the lens 120, and known methods such as a method of moving the transparent original supporting means 118 that supports the transparent original 111 or the focusing surface 126a can be used. Both are applicable.

The mirror 122 converts the projection light that has passed through the imaging lens 120 into
It is for reflecting the light onto the image forming member, and any ordinary mirror body may be used.

In the example shown in FIG. 1, a Fresnel lens 124 and a focusing glass 126 are used as the imaging members. The Fresnel lens 124 is disposed on the focusing glass 126 to allow light to enter the focusing plane of the focusing glass 126 perpendicularly and to improve light collection efficiency. Further, since the lower surface of the focusing glass 126 is placed directly on the document table 80, the focusing surface of the focusing glass 126 is
6.

In the present invention, the image forming member is not limited to those mentioned above, but may also include a diffuser plate, a halftone screen, a Fresnel lens, etc., or a combination of these. Any method may be used as long as it can form a projected image with a thickness of 11.

Moreover, such an imaging member may be fixed to the box body 130, or may be made detachable. Alternatively, it may be arranged at a predetermined position on the document table of the copying machine, and the transparent document projecting device 14 may be placed above the document table.

In addition, in the present invention, as described above, the achromatic color density gradient filter may be disposed on such an imaging member to serve as the light amount correction means.

In addition, in the transmission original projector of the present invention, if the amount of projected light on the exposure surface is approximately uniform over the entire surface, the amount of light of the projected image obtained on the imaging member does not necessarily have to be uniform over the entire surface. In this case, for example, if the exposure method of the applied copying apparatus is slit scanning exposure, the projected image obtained on the imaging member will have a higher light intensity in the width direction from the center in the middle of the slit, as described above. The projected image may have a substantially uniform amount of light in the scanning direction.

Furthermore, the projection image obtained on the image forming member has a substantially uniform light quantity over the entire surface, and the copying apparatus may also be provided with a light quantity correcting means such as a filter to make the light quantity substantially uniform on the exposed surface.

In the transmission original projection apparatus of the present invention as described above, various cooling fans may be provided to lower the internal temperature.

Further, the box body 130 may have a known positioning means such as a positioning pin.

FIG. 2 shows an example of copying a transparent original by applying the transparent original projector 14 of the present invention to a slit scanning exposure type silver halide photocopying apparatus.

A silver halide photocopying apparatus 10 (hereinafter referred to as the copying apparatus 10) shown in the figure includes a photosensitive material supply unit 16 on the right side, an exposure unit 18 above it, and a processing unit 20 below it. ing.

Then, the transparent original projection device 14 of the present invention is arranged at a predetermined position on the upper surface of the exposure unit 18. This transparent original projection device 14 is similar to that described in detail above.

Note that when copying a reflective original, the copying apparatus 10 uses a third
As shown in the figure, the transparent original projection device 14 is removed and replaced with an original presser 15.

The photosensitive material supply section unit 16 has a photosensitive material conveyance path within the photosensitive material supply section frame 28, and a pair of magazines 30.32 are removably attached to the upper and lower sides, and photosensitive materials 34.36 are stored inside these magazines. are each housed in a roll shape, and are taken out from the tip to the optical material supply unit 16. - For example, 3°4 is a photosensitive material most suitable for copying a color printed original that is a reflective original, and 36 is a photosensitive material that is most suitable for copying a color slide original or a color negative film original that is a transparent original.

At the front of the magazine 30, conveyor rollers 42a and 42b for drawing out the photosensitive material 34, and a cutter 44 for cutting the photosensitive material 34 into a predetermined length are arranged.

Between the cutter 44 and the exposure section 46 are photosensitive material conveyance guides 48a, 48b, 48c and conveyance rollers 50.
52 is arranged to expose the cut photosensitive material 34 to the exposure section 46.
It is designed to guide you to.

The exposure section 46 is an exposure position 46a (exposure surface) of the photosensitive material 34.
In this exposure section 46, a glass plate 54 is fixed facing the imaging optical system of the exposure section unit 18, and a press plate 56 is pressed to this glass plate 54.

A pair of transport rollers 58a, 58b and a transport roller 60a are provided on the upstream side (upper side) and the downstream side (lower side) of the exposure section 46, respectively.

60b is provided.

A conveyance guide 62 that guides the exposed photosensitive material 34 downward is arranged vertically below the exposure section 46, and a conveyance guide 66 that branches the conveyance path of the photosensitive material 34 (36) is arranged in the vertically intermediate part thereof. A switching guide 64 is provided for switching to the processing section unit 20 through the switching section.

On the other hand, the magazine 32 disposed below the magazine 30 also has transport rollers 68a and 68 corresponding to the photosensitive material 36.
b and the cutter 70, and in front of them, conveyance guides 72a, 72b and a conveyance roller 74 are arranged to convey the photosensitive material 36 to the conveyance guide 48a.

The exposure unit 18 includes a document table 80, which is usually made of a transparent glass plate on which a reflective document is placed, and a document table 8.
a light source moving type imaging optical system 82 for performing slit scanning exposure of the image on the photosensitive material 34 (36) of the exposure section 46;
It has an image sensor 94 used for image adjustment, and a shutter 96 that acts on the optical path to switch the optical path between the exposure unit 46 side and the image sensor 94 side. Further, when copying a transparent original, the transparent original projecting device 14 of the present invention is placed on the upper surface of the exposure unit 18.

Here, the light source moving type imaging optical system 82 includes a light source unit having a light source 84 and a reflecting mirror 86 that integrally scan the lower surface of the document table 80, and a light source unit that moves in the same direction at 1/2 the speed of this light source unit. The mirror 88 and 90 reflect the light from the light source 84 in a predetermined direction, and a lens unit 92.

Note that the light source moving type imaging optical system 82 applied to this copying apparatus 10 is configured to be capable of 0.5 to 2.0 zoom copying.

When copying a reflective original, the original image on the original platen 80 is illuminated by the light source 84 in the light source unit 36, and the mirror 86
, 88, 90, the original image reflected by lens unit 9
2, and the photosensitive material 34 (36) in the exposure section 46 is exposed by opening the shutter 96.

Note that when copying a transparent original, the light source 8 is
4 is not lit, and the projection light of the projected image obtained on the focus surface 126a is incident on the mirror 86, and this projection light is directed to the exposure position 46.
A is formed to expose the photosensitive material 34 (36).

In addition, during pre-scanning or white balance correction, the shutter 96 is in a closed state as shown by the dotted line in the figure, and the original image or the image on the white plate is reflected by the shutter 96 and input to the image sensor 94 to adjust the exposure correction conditions. It is to be determined.

Here, the lens unit 92 is made up of units such as a plurality of lenses, an aperture, and a color correction filter.
The original image on the photosensitive material 34 (36) of the exposure section 46
The image is formed by changing the magnification to a predetermined magnification and performing exposure under optimal exposure conditions, and is equipped with an aperture and a color correction filter to enable adjustment of exposure conditions.

The processing section unit 20 includes a processing section 22 and a drying section 24. A developing tank 102, a bleaching/fixing tank 104, and a washing tank 106 and 108 are successively provided in the processing section 22,
The processing liquid filled inside these allows for development, bleaching,
The photosensitive material 34 (36) that has been fixed and washed with water is sent to the drying section 24.

In the drying section 24, the photosensitive material 34 (36) after being washed with water is dried and sent onto the take-out tray 110.

The transparent original projector 14 of the present invention has a uniform light amount of the projected image on the exposure surface over the entire surface, with no difference in light amount between the center and the periphery. By copying a transparent original using the same method, it is possible to obtain a good copy image with no unevenness in the amount of exposure light.

The transmission original projection device of the present invention is applicable not only to the above-mentioned silver halide photocopying device, but also to copying devices using various photosensitive materials such as light-sensitive pressure-sensitive photosensitive materials, photosensitive resin materials, etc., and electrophotographic copying devices. It is applicable to various copying devices such as copying devices.

Furthermore, the transmission original projection apparatus of the present invention is not only applicable to the above-mentioned copying apparatus, but also may be used as a standalone apparatus to directly print a transmission image onto a photosensitive material.

Function> The transmission original projection apparatus according to the present invention is basically configured as described above, and its function will be explained below.

As shown in FIG. 2, a transparent original projection device 1 of the present invention
4 is placed at a predetermined position on the exposure unit 18.

Next, the transparent original supporting means 11 of the transparent original projecting device 14
8, set the transparent original 111 thereon.

For example, if the transparent original 111 is a slide, the CC correction filter 116 is replaced with a positive one.

When the projection light source 112 is turned on in this way, it becomes a projection light source!
In the transparent original projector 14 of the present invention, the irradiated light from the projection light source 112 is emitted from the projection light source 126a of the transparent original projector 14. The amount of light is at the exposure position 46 of the copying device 10.
When an image is formed on a (exposure surface), the image forming light amount correction filter 114 is used to make the image almost uniform over the entire surface.
It is corrected according to the s4 law.

Next, the color balance of the irradiated light from the projection light source 112 whose light amount has been corrected is corrected by a CC correction filter 116, and the transparent original (slide) 111 is irradiated with the irradiated light.

A light ray t passes through the transparent original 111 and carries the original image.
, p pass through lens 120 and are reflected by mirror 122 and directed toward an imaging member.

In the imaging member, the light rays t and p reflected by the mirror 122 by the Fresnel lens 124 are focused on the focusing glass 126.
The light is adjusted so that it enters the focus plane perpendicularly to the focus plane 126a, and the light condensing efficiency is increased to enter the focus glass 126, and a projected image is formed on the focus plane 126a.

The projected image obtained here is processed by the light amount correction filter 114 so that the amount of projected light is almost uniform over the entire surface at the exposure position 48a (exposure surface) of the copying device 10, as described above. The amount of light is corrected according to the cos fourth law.

In this embodiment, since the copying apparatus 10 uses a slit scanning exposure method, the obtained projected image is such that, for example, in the middle of the slit, the amount of light increases from the center to the width direction, and the amount of light is uniform in the scanning direction. This is a projected image. Furthermore, if the exposure section unit 18 of the copying apparatus 10 has a light amount correction means according to the CO54 law, the projected image may have a uniform light amount over the entire surface.

Next, when a copy start button (not shown) of the copying apparatus 10 is pressed, the light source unit starts scanning and pre-scanning is started. At this time, the light source 84 of the light source unit is not turned on.

When the projection light of the projected image enters the mirror 86 of the light source unit that moves six times at the scanning speed and is reflected, the reflected light moves eight times in the same direction as the light source unit at half the scanning speed. It is reflected by the mirror 88°90, passes through the lens unit 92, the optical path is reflected by the shutter 96, and enters the image sensor 94, and the image information is transmitted to the image sensor 9.
4, and exposure correction conditions are set.

After the pre-scan, the light source unit and mirror 8
8.90 returns to the scanning start position.

On the other hand, while the above-described prescanning and color filter and aperture correction are being performed, a photosensitive material necessary for copying according to the original is selected.

- For example, if the photosensitive material for slide copying is the photosensitive material 36, and the photosensitive material 36 is selected, when the transport motor (not shown) is driven, the transport rollers 68a,
68b, 74. 74 feeds out the photosensitive material 36 by a predetermined length, and the cutter 70 cuts the photosensitive material 36 to the required length. Thereafter, the transport motor is driven again, and the photosensitive material 36 is sent to the exposure section 46, where it waits just before the exposure position 46a.

When the shutter 96 rotates to the position shown by the solid line in FIG. 3 to enable exposure and the light source unit starts main scanning of the original image formed on the focusing glass 126, at the same time, the transport rollers 58a and 58b of the exposure section 46 60a and 60b start scanning conveyance of the photosensitive material 36 in synchronization with the scanning speed of the light source 84.

During main scanning, the projection light of the projected image that is incident on and reflected by the mirror 86 which moves at the scanning speed is reflected by the mirror 88 and 90 which moves in the same direction at half the speed of the mirror 86, and the color and aperture are passes through a suitably adjusted lens unit 92, forms an image at an exposure position 46a (exposure surface), and exposes the photosensitive material 36, which is scanned and conveyed in synchronization.

As this exposure progresses, the photosensitive material 36 is transferred to the conveying roller 58.
The conveyance guide 62 is inserted between a, 58b and 60a, 60b.
is sent downward through. In this case, the switching guide 6
4 does not act on the photosensitive material conveyance path, and the photosensitive material 36 sent from the exposure section 46 moves vertically downward within the conveyance guide 62. Therefore, when the exposed photosensitive material 36 is fed into the processing section 22 of the processing section unit 20, there is no slack in the intermediate portion of the photosensitive material 36 due to the speed difference between the photosensitive material supply section unit 16 and the processing section 22.

When all the exposure is completed, the shutter 96 rotates to the position shown by the dotted line in FIG. is sent into the conveyance guide 48c.

Note that the transmission original projection apparatus 14 of the present invention may be configured so that the projection light source 112 is turned off at the time when exposure is completed.

This reverse conveyance is stopped when the leading end of the photosensitive material 36 is upstream of the switching guide 64.

Thereafter, each conveyance roller is rotated again in the same direction as the initial conveyance direction. In this case, the switching guide 62 acts on the photosensitive material conveyance path, and moves the leading end of the photosensitive material 36 to the conveyance guide 62.
2 and sent out to a branch conveyance guide 66. Therefore, the leading end of the photosensitive material 36 is sent to the processing section 22 of the processing section unit 20 through the branch conveyance guide 66.

The exposed photosensitive material 36 sent into the processing section 22 is transferred to the developing tank 1.
02, bleached and fixed in a bleaching/fixing tank 104, thoroughly washed with water in washing tanks 106 and 108, and then sent to a drying section 24. After drying, it is transferred to a takeout tray 11.
It is taken out above 0.

Although the transmission original projection device according to the present invention is configured as described above, the present invention is not limited thereto, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

<Effects of the Invention> According to the transmission original projection device of the present invention, the light amount is suitably corrected so that the light amount of the projection light of the projected image is almost uniform over the entire surface on the exposure surface of the copying device. By using this to copy a transparent original such as a negative or a slide, it is possible to obtain a good copy image of the transparent original with approximately the same amount of exposure over the entire surface.

[Brief explanation of the drawing]

The first is a schematic cross-sectional view of an example of a transmission original projection device of the present invention. FIG. 2 is a schematic cross-sectional view of an example in which the transmission original projection apparatus according to the present invention is applied to a silver halide photocopying apparatus. FIG. 3 is a schematic cross-sectional view of a conventional silver halide photocopying apparatus for reflective originals. Description of symbols 10... Copying device, 12... Apparatus main body, 14... Transparent original projection device, 15... Presser plate, 16... Photosensitive material supply section unit, 18... Exposure section unit , 20... Processing section unit, 22... Processing section, 24... Drying section, 26... Reserve liquid storage section, 28... Photosensitive material supply section frame, 30. 32... Magazine, 34.36...Photosensitive material, 38...Opening/closing lid, 40.100...Bin, 46...Exposure section, 46a...Exposure position, 54...Glass plate, 56...Suppression Boards, 58a, 58b, 60a. 64... Switching guide, 80... Document table, 82... Imaging optical system, 84... Light source, 86.88.90... Mirror 92... Lens unit, 94... Image Sensor, 96...Shutter, 98...Exposure section frame, 102...Developer tank, 104...Bleaching/fixing tank, 106.108...Washing tank, 60b...Transport roller, 110. ...Ejection tray, 111...Transparent original, 112...Light source for projection, 114...Light amount correction filter, 116...Negative/positive CC correction filter, 118...
・Transparent original support means, 120...Imaging lens, 122...Mirror 124...Fresnel lens, 126 River focusing glass, 130...Box N Procedure booklet (method) December 1988 26th of the month

Claims (1)

[Claims] (1) A transparent original projection device used when copying a transparent original with a copying device, which comprises: a projection light source for projecting a transparent original; a support means for the transparent original; an imaging lens; and a transparent original. an imaging member for forming a projected image of the copying device, and a focusing means, so that the amount of projection light from the projection light source is substantially uniform over the entire surface of the exposure surface of the copying device. A transparent original projection device characterized by having a light amount correction means for correcting the amount of light.