JPH01238635A - Fitting and adjusting method for projecting adapter - Google Patents

Abstract

PURPOSE:To readily and correctly fit and adjust a projecting adapter by observing an image formed through a magnifying and projecting lens in a position different from the position where an image of photosensitive material is formed via a mirror device. CONSTITUTION:The original platen 2 of a copying device is removed to fit a pan 2A, and a magnifying and projecting device 110 forming the projecting adapter and a large mirror unit 130 are loaded. Then a magnified, projected image is formed in an exposure position 40 and is exposed on photosensitive material. To fit and adjust the projecting adapter, a mirror 143 is inserted between the projecting lens 118 of the device 110 and the exposure position 40 through a mirror frame 142, and the magnified and projected image is formed in another conjugate position of the position 40 on a projecting plate 154. When the adapter is adjusted by viewing the image, it can be adjusted and fitted to a magnifying and projecting unit readily and correctly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention combines a special projection optical system with a copying device that uses a silver halide photosensitive material as a normal scanning exposure type photoreceptor, and enables transparent printing of slide films, etc. The present invention relates to a method of adjusting a copying apparatus so as to make it possible to copy an enlarged image of a screen.

[Conventional technology]

2. Description of the Related Art In recent years, copying apparatuses have been using exposure using a slit scanning method. In the past, a full-surface static exposure method was used, but it was difficult to make uniform illumination and the space for the optical system was large, so a shift has been made to a slit scanning exposure method, which is advantageous for uniform illumination and compactness.

Copying machines rapidly became smaller and cheaper.I
child .

However, although this slit scanning exposure type copying device is suitable for copying flat, large-screen originals, it has disadvantages for making enlarged projection copies of other objects, such as small film originals, and is not suitable for copying large-screen originals. It was difficult to apply it to

That is, even in the case of enlarged projection copying from a small film original, when synchronizing the film original movement and the photoreceptor movement according to the slit scanning method, the larger the enlargement magnification, the larger the synchronization movement error, and the better the image quality. You won't be able to get it.

Therefore, when copying an enlarged projected image from a small film original, the enlarged projected image is continuously created as an aerial image on the copying machine's original document table while the copying device is scanning, and this is then used by the scanning exposure optical system of the copying device. As a result, a method has been adopted in which images are formed on a photoreceptor.

However, when an enlarged projected image is created as an aerial image on the document table, the light rays at each point of this image are directed in a straight line connecting the pupil of the enlarged projection lens and this point, so the optical system of the copying machine cannot compensate. It is not possible to form an image on the photoreceptor. Only the component parallel to the optical axis passing through the pupil of the enlarged projection lens is imaged onto the photoreceptor.

In an attempt to solve this problem, attempts have been made to place a convex lens as a condensing lens on the document table to refract the light rays of the enlarged projected image into the lens of the scanning exposure optical system of the copying apparatus.

However, in order to image the aerial image of the enlarged projection image formed on the document table onto the photoreceptor using a copying optical system for static exposure, it is necessary to
The lens placed on the document table may be a spherical lens, but the lens should be thick and have a large circular area, and its periphery should be cut off to create a rectangular lens that is sized to match the glass surface of the document table. Therefore, it is not a good idea as it requires an expensive large aperture lens and it is wasteful to cut out some of it.

Rather, in a copying apparatus using a slit scanning exposure optical system, it is better to use a 7-channel lens as a condensing lens rather than a spherical convex lens.

In addition, in the case of a concentric Fresnel lens, it has a uniform force in the optical axis direction of the Fresnel lens, so in slit scanning exposure, the power required for parallel light over the entire scanning direction and the slit longitudinal direction are , and the power that should be focused toward the lens of the scanning exposure optical system.

In other words, since the optical axis of the copying device toward the document is perpendicular to the document table in all scanning directions, the optical axis of the copying device is perpendicular to the document table in all scanning directions. Unless the direction is changed in a certain direction, the angle of incidence on the optical system of this copying device will change in response to scanning, and the light rays that do not align with the optical axis of the copying device will not enter the lens of the scanning optical system of the copying device, causing the entire scanning Uniform exposure across sections becomes impossible.

Therefore, in this direction, it is desirable to use a cylindrical Fresnel lens whose focal length is the distance from the principal point of the magnifying projection lens to the document table.

On the other hand, although the longitudinal direction of the slit is configured perpendicular to the scanning direction, uniform exposure cannot be achieved unless the light rays throughout the longitudinal direction of the slit are uniformly incident on the lens of the scanning optical system of the copying device. .

Therefore, in this direction, it is desirable to use a cylindrical Fresnel lens having a focal length such that the principal point of the magnifying projection lens forms an image on the principal point of the scanning optical system lens.

In this way, by attaching a projection adapter to a scanning exposure type copying apparatus, it becomes possible to obtain a large enlarged copy from a small transparent original such as a slide film, and the functions of the copying apparatus can be expanded. However, the adjustment work of the projection adapter to the scanning optical system of the main body of the copying apparatus requires high precision and is complicated. After all, in the past, the image formation state and the optical axis matching state were adjusted by actually copying and illustrating the image. The state of the picture display may be as shown in Figure 10, where the entire screen is completely black, or as shown in Figures 11 (1) and (2), where uneven color appears at the front or rear edge of the screen, or as shown in Figure 12 (1). ),
If color unevenness appears on the left and right as shown in (2), how to adjust it?
Even after repeating the illustrations, it was not easy. On the other hand, Canon's CLCl receives an enlarged image projected onto the document table glass through a concentric Fresnel lens with a close-contact integrated sensor, and the sensor moves for scanning. This is a method in which the amount of information in an aerial image is converted into digital data and the image is recorded on paper. In such a device, a spot is set in front of the lens of the projection adapter device, a reflecting mirror is placed on the document glass, and it is observed whether the reflected image is formed at the spot position. This allows you to adjust the position of the projection adapter.

[Problem that the invention seeks to solve]

In other words, in devices like this conventional example, in which a close-contact integrated sensor is moved in close contact with the document and copies are made while obtaining screen information, the main body is originally not equipped with a projection lens, and is small in size. Since the optical system is formed by the adapter only for enlarging the transparent original, its adjustment can be done using a relatively simple method as described above.

However, the adjustment method for a copying machine that is originally equipped with a scanning exposure device of a projection lens system and a projection adapter equipped with a projection lens system is the same as that of Canon C.
It is not as simple as adjusting the LC1 equipment.

In other words, even if the projection adapter is adjusted so that an accurate image is formed on the document table, when the image on the document table is re-imaged onto the photosensitive material by the projection optical system of the main body of the copying machine, the image cannot be formed properly. The state is such that the adjustment work on the document table is not effective.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a method for accurately and easily attaching and adjusting a projection adapter in a scanning exposure type projection copying apparatus.

[Means for solving problems]

The purpose of this is to use a projection adapter to project a small transmissive film original onto the copying machine's document table, and use a condensing lens and a projection lens in the copying machine to form an image on a photosensitive material and copy the image. A mirror device is set between the image forming position of the photosensitive material and the projection lens in the apparatus, and the position of the projection adapter is adjusted by observing the image forming state at a position different from the surface of the photosensitive material. This is achieved by a projection adapter attachment adjustment method characterized by the following.

〔Example〕

The projection adapter for which the adjustment method of the present invention is used is installed, and the copying machine in which the mirror device is set as an adjustment jig is first installed.
It is shown in the schematic configuration diagram in the figure. The copying device 1 has a scanning exposure optical system 3
and a silver salt photosensitive material (hereinafter simply referred to as photosensitive material) supply device 50
, a developing processing device 24, a drying device 35, and an attached projection adapter 140 consisting of an enlarged projection device 110 and a large mirror unit 130 disposed above the document table 2 of the scanning exposure optical system 3.

The enlargement projection device 110 is attached via a bracket 121 that is fixed against a frame 120 provided on the upper surface of the main body of the copying apparatus where the document table 2 is located. , condenser lens 119, small transparent film document placement frame 11
2 and an enlarged projection lens 118 are incorporated. A frame 124 is provided to surround the document table 2, and a large projection mirror 115 is installed in the frame, so that a projected enlarged image of the film document placed on the transparent film document placement frame 112 is projected onto the document table glass 2. The image is to be focused on the top surface. Moreover, cylindrical Fresnel lenses 131 and 132 are placed on the document table crow 2 so that their cylindrical axes are parallel or perpendicular to the sliding direction of the scanning exposure optical system 3.

Further, the large mirror unit 130 composed of the frame 124, the projection mirror 115, and the Fresnel lens 13L132 can be mounted on the document table 2 without using the enlargement projection device 110.
When making a normal copy of a document placed on top at a magnification close to 100%, either fold it in a different position, or
It is designed to be removed from the

As shown in the plan view of FIG. 2, the cylindrical flare lens 132 has a cylindrical surface set at a pitch of 0.125 mm and a focal length of 277 mm on an acrylic resin surface with a thickness of 1.5+ nm. Then, it is placed on the document table so that it is perpendicular to the cylindrical axis direction or the slit direction.

The focal length of 277 mm means that the distance between the principal point of the magnifying projection lens 118 and the 7-Resnel lens surface near the top surface of the document table is 902 mm, and the distance from the Fresnel lens surface to the principal point of the lens 8 of the scanning exposure optical system. When the distance is set to 400 mm, this value is designed so that the principal points of each lens form images with each other.

Further, as shown in the plan view of FIG. 3, the cylindrical lens 131 has a cylindrical surface with a pitch of 125 mm and a focal length of 902 mm on an acrylic resin surface with a thickness of 1.5 mm. Then, it is placed on the document table so that the axial direction of the cylinder is parallel to the slit direction.

The distance of 902 mm between the principal point of the magnifying projection lens 118 and this cylindrical Fresnel lens surface near the top surface of the document table glass is the focal length of the cylindrical Fresnel lens.

As a result, an aerial image of the screen on the transparent film document placement frame 112 near the document table 2 by the magnifying projection lens 118 is formed by the exposure lamp 4 and the reflecting mirror 4A of the scanning exposure system.

The slit 4B and the mirror 5 are attached to the first traveling table 5A, which runs parallel to the document table at a speed V, and the second traveling table 6, which runs in the same direction as the first traveling table at a speed V/2.
The image passes through a mirror 6.7 and a lens 8 attached to A and is focused on an exposure position 40 on the photosensitive material in the photosensitive material supplying device 5o.

Here, it is preferable that the exposure lamp 3 on the first carriage 5A be turned off during the scanning exposure. It is sufficient to irradiate the irradiation lamp 113 of the enlarged projection device 110. but,
If it is not possible to turn off the exposure lamp 3 due to the circuit configuration, it is preferable to leave it on and coat the back surface of the document table glass 2 and the side of the cylindrical Fresnel lens 13L132 facing the document table glass with an antireflection film layer.

Furthermore, the cylindrical Fresnel lenses 131 and 132 may be placed in either vertical relationship.

On the other hand, the photosensitive material is fed to a conveyance path 102 for a predetermined length from the long roll 60 and measured, and the sheet photosensitive material cut by the cutter 61 passes through the conveyance path 101 and is sent to the stocker 102. 20 m above the exposure position 40
The rear end reaches position m and stops once, and the first traveling base 5
It passes through the exposure position 40 at a speed synchronized with the speed of A, runs backwards on the transport path 101, enters the branch transport path 103, and finishes the scanning exposure.

The exposed sheet photosensitive material passes again over the branch conveyance path 103 and the conveyance path 101, is returned to the stocker 102, and then passes through the branch conveyance path 104 and continues along the connecting conveyance path 105 with the same side as at the time of exposure at the beginning. Enter the processing unit 24.

The processing liquids are then conveyed through the processing liquids in the developing tank 25, the bleach-fixing tank 30, and the first and second stabilizing tanks 31, 32, and are then transported to the drying section 35.
After that, the photosensitive material cart is recovered with the copied image finished.

The photoreceptor is highly effective for copying using silver halide photoreceptors, especially color photoreceptors, but it is of course possible to copy even black and white photoreceptors, and for copying that involves forming an image on an electrophotographic photoreceptor. It is also possible to configure the device.

In this way, the enlarged projection device 110 and the large mirror unit 13
A method of attaching and adjusting the projection adapter 140, which is made up of 0 parts, to the main body of the copying apparatus will be described below.

First, the bracket 121 to which the enlarged projection device 110 is attached is temporarily fixed to the frame 120 on the upper surface of the main body 1 by abutting it against a reference plane in the optical axis direction. Also bracket 121
As shown in FIGS. 1 and 6, a projection plate 154 is attached and fixed with tape 157. Projection plate 154
A projection window 156 is opened, a light shielding plate 155 is provided, and the projection window 156 is further provided with a light diffusing plate.

Further, the document platen glass 2 is removed, a transparent large mirror unit receiving plate 2A is attached, and the large mirror unit 130 is placed on it and temporarily fixed. Since the receiving plate 2A=12- is shorter than the document table glass 2, the hand can be easily inserted from above, and the mirror frame 142 of the mirror device 141 as an adjustment jig is inserted therein as shown in FIGS. 1 and 5. The hook provided on the light shielding cover 151 of the internal scanning projection optical system is attached to the notch 144 of the mirror frame 142 on the plate 152.
Insert the lower part 145 of the optical system frame into the bottom part 1 of the optical system frame.
9. In this way, the mirror 143 provided in the mirror frame 142 can be
It is directly under the projection window 156 of No. 4.

The optical path to the original image forming position 40 on the photosensitive material is changed by the mirror, and the image is formed on the light diffusing plate of the projection window 156.

With this setting, if the projected image of the slit 4B on the diffuser plate is balanced with the projection window as shown in FIG. 7, and the slit image width A is about 5rAII+, it can be said that the adjustment is complete.

If the slit image width deviates from 5 mm, turn the tilt angle adjustment screw 115A of the projection mirror 115 of the large mirror unit 7 130 and make it larger or smaller than 45° while checking the width of the projected slit image. Perform adjustment operations to determine whether

If the slit image shows a yellow color on the back side (upper part of the figure) as shown in Fig. 8, move the large mirror unit in the plane parallel to the receiving plate 2A that replaces the document table as shown in Fig. 4. Arrow CW
If yellow appears on the front side (lower part of the figure) as shown in Figure 9, move the large mirror unit in the direction of the UCW arrow in the plane of plate 2A as shown in Figure 4. It can be erased by turning it. In this way, the large mirror unit 130 is clamped (fixed) in that state until the position is determined. That is, the adjustment of the position of the large mirror unit is completed in this state. After removing the mirror device 141, the receiver plate 2A is also replaced on the document table glass 2 and returned to its original position. Of course, even if this is done, the clamped state of the large mirror unit will continue and the adjustment will not be disrupted.

Next, as shown in FIG. 13, a blank sheet of paper is placed on the Fresnel lens of the large mirror unit 130, a small transparent film original is set on the small transparent original placing frame 112 of the enlarged projection device 110, and the lamp 113 is turned on. When looking at the projected image on the Fresnel lens, as shown in FIG. 14 (1), the rear side (
Look at the amount of deviation ASB from the frame (top) and front side (bottom), and move the magnifying projection device toward the back or front side as shown in Figure 14 (2) so that they are equal. move.

Similarly, the deviation in the left and right direction is determined by moving the enlarged projection device 110 upward and downward as shown in Fig. 15 (2) so that the deviation amounts A' and B' are the same as shown in Fig. 15 (1). Adjust by moving in the direction.

The above adjustments can be easily made by moving the adjustment screw on the back side of the projection device as shown in FIG. 14 (2) and FIG. Complete.

By the above method, the installation and adjustment of the projection adapter 140 composed of the enlarged projection device 110 and the large mirror unit 130 can be easily and accurately completed.

〔Effect of the invention〕

According to the present invention, when a projection adapter is attached to a projection-type scanning exposure type copying apparatus and enlarged copies are made from a small transparent film original, the method for attaching and positioning the adapter is simple and accurate, and the number of adjustment steps is greatly reduced. This greatly contributed to the expansion of applications, especially for color copying devices.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a copying machine equipped with a projection adapter in which the adjustment method of the present invention is used. FIG. 2 is a plan view of a cylindrical Fresnel lens having seven channel groups in the slit direction and used for a projection adapter. FIG. 3 is a plan view of a cylindrical Fresnel lens having a Fresnel group in the scanning direction and used for a projection adapter. FIG. 4 is a perspective view showing the configuration of the projection adapter. FIG. 5 is a perspective view of the mirror device and the light shielding cover. FIG. 6 is a perspective view of a projection plate attached to an enlarged projection device. FIG. 7, FIG. 8, and FIG. 9 are all projection views of the slits on the projection plate. Figure 10, Figure 11 (1), (2), Figure 12 (1),
(2) is a schematic diagram of a copy image when it is not adjusted by the enlargement projection adapter. FIG. 13 is a perspective view when a blank sheet of paper is placed on the Fresnel lens of the large mirror unit of the projection adapter. FIG. 14(1) is a top view showing the deviation between the vertical direction of the enlarged projected image of the small transparent film original and the outline of the Fresnel lens. FIG. 14(2) is a diagram showing the adjustment movement direction and adjustment screw of the enlarged projection device. FIG. 15(1) is a top view showing the deviation between the horizontal direction of the enlarged projected image of the small transparent film original and the outline of the flare lens. FIG. 15(2) is a diagram showing the adjustment movement direction and adjustment screw of the enlarged projection device. 2-Original table 4...Exposure lamp 2A, plate 4A, reflector 4B...slit 5.6.
7. Mirror 8 Lens 40. Exposure position
110...Enlargement projection device 112/Small transparent document placement frame 113 Irradiation lamp 114...Reflector 11
5... Projection mirror 115A... Adjustment screw 11
8... Magnifying photographic lens 130... Large mirror unit 131132... Cylindrical Fresnel lens 14
0. Projection adapter 141...Mirror device 142
-Mirror frame 143...Mirror 144...Notch part 145...Bottom part 151...Shading cover 152...Hook is plate 154/Projection board
155・Shading plate 156・・Projection window

Claims (1)

[Claims] In a copying machine that projects a small transparent film original onto the vicinity of the document table of a copying machine using a projection adapter and forms an image on a photographic photosensitive material using a condensing lens and a projection lens of the copying machine main body, the photosensitive material is copied. A mirror device is set between the image formation position of the material and the projection lens, and the position of the projection adapter is adjusted by observing the image formation state at a position different from the surface of the photosensitive material. How to install and adjust the projection adapter.