JPS6283739A - Exposing device - Google Patents

Abstract

PURPOSE:To adjust a correctly, rapidly and easily a focusing condition by providing freely attachably and detachably a supporting member to support a photosensitive material at an image forming position. CONSTITUTION:A the front surface of a glass plate 26, a film-shaped chart 27 for adjusting the focus is bonded, and at the rear surface side of the glass plate, a tube-shaped light source 28 is provided and fixed at the rear surface side of a rear surface receiving plate 25 so as to be in parallel to the glass plate 26. Both right and left edges of the rear surface receiving plate 25 form fitting surfaces 25A and 25B bent in a right-angled manner, and the outside size of both fitting surfaces is formed to the same size as that of the inside interval of supporting plates 13 and 14 and fitted freely in the fitting, inserting and detaching manner. At the fitting surfaces 25A and 25B, reference holes 25C and 25D are made, when the rear surface receiving plate 25 is fitted and inserted to the inside of the supporting plates 13 and 14, the holes are coincident with reference holes 13B and 14B. Thus, the frame adjustment of the image forming part of a copying device can be correctly, rapidly and easily attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to an exposure device for scanning an original by irradiating it with a light source in an image recording device such as a copying device, and particularly relates to an exposure device for scanning an original by irradiating it with a light source. This invention relates to an improvement in the exposure vc setting for forming an image on a surface.

[Prior Art J] Conventionally, in an image recording device such as a copying machine, an optical system moving scanning type exposure device is used, in which an original is placed and fixed on a document platen glass, and a scanning optical system including an illumination lamp is moved; A document table on which the original is placed with the optical system including the illumination lamp fixed.
There are two types of exposure devices: a scanning type exposure device that moves the document table;

In any of the above exposure devices, the original placed on the document glass is exposed and illuminated in a predetermined width by an illumination lamp installed below the document glass and inside the main body of the copying device, etc. Light is guided into an optical system consisting of mirrors and lenses. By relatively moving one or both of the document table and the optical system, the HX draft surface area is scanned and exposed, and a copied image is formed on the photosensitive surface of the imaging section via the optical system.

Here, the photosensitive surface of the imaging section is a photoconductive photoreceptor or a photoreceptor! Photosensitive materials, etc.

FIG. 5 shows an overall elliptical diagram of a copying apparatus using a photographic light-sensitive material on the light-sensitive surface of the imaging section. The photosensitive material used in this copying apparatus is, for example, a versatile silver helodenide photographic photosensitive material.

A paper feed section 3o is provided near the upper right of the main body 1 of the copying apparatus, and a paper feed section 3o is provided in which a roll-shaped photosensitive material (hereinafter referred to as a photosensitive roll) R is provided.
31 has been installed. Magnon 3
The photosensitive roll R in 1 passes through a feeding member 32 and is held by a feeding belt 33, and when it is further held by a rotating feeding roller 34 and fed a predetermined length, it is transferred to a cutting device 35.
It is cut into a cut sheet shape. This cut sheet-shaped photosensitive material (hereinafter referred to as a photosensitive sheet) S is transferred to a transport roller 36. It is held between conveyance belts 37 and sent slightly diagonally upward, and then turned at right angles by conveyance rollers 38 and conveyed vertically downward, passing through the imaging section, and then being held and conveyed by conveyance rollers 39.

When the leading edge of the photosensitive sheet S passes through the imaging section, the scanning optical system is driven in response to this, and the first mirror unit 73 scans the document surface on the document table 2 with a predetermined width, and The second mirror unit 4 also moves, and the scanning light beam enters the main lens 5, passes through the fourth mirror 6, the tpJ fifth mirror 7, and forms a latent image on the photosensitive sheet S. The above-mentioned exposure scanning is almost the same as that used in a known electrophotographic copying machine, but the image is reversed by the final fifth mirror 6, and the corresponding latent image is directly transferred to the photosensitive sheet (DI). form y+l
t will be done.

The photosensitive sheet S that has undergone scanning exposure is then sent to the development processing section 4.
Sent to 0. Here, first, it is immersed in a color development tube 41 for a predetermined time to form a corresponding developed image.

Note that 42 is a light source that provides fog exposure. After color development, the photosensitive sheet) S is processed for a predetermined time in the adjacent bleaching/fixing XJ tank 43 and stabilizing tank 44, 45, and then sent to the drying section 46 where it is dried and sent to the copying machine. It is discharged outside and placed on the tray 47.

In a copying machine using a surface scanning type exposure device, problems such as focusing in the image forming section and blurring on one side of the left and right sides, etc. ii! In order to complete the entire adjustment process, the plate 8 of the back bone of the photosensitive material in the imaging section is made of transparent glass, and a tubular light source 9 is installed on the back side of the transparent glass, at the position of the photosensitive sheet S. Place a chart for focus adjustment. Then, the tubular light source 9 is turned on to illuminate the chart, and the transmitted light follows the backlight path of the exposure device to form an image of the chart on the surface of the document table 2, so that the entire scanning area is accurately focused. to match,
Said first mirror unit 3. fjA Nimiror unit 4. Main lens 5. The five Ifi mirror units 6 and the six #S mirrors 7 are adjusted to set their respective positions and angles.

[Problems to be Solved by the Invention] In a copying device using the scanning exposure device, the photosensitive material is silver halide photographic material (for example, color film, color photographic paper, etc.) or other highly sensitive photosensitive material. When a sheet or the like is used, image quality deterioration such as fogging occurs in the copied image formed on the photosensitive surface of the imaging section.

This is because silver halide photographic light-sensitive materials are generally sensitive to a wide range of wavelengths and have the characteristics of being able to record high-quality images with high sensitivity, high density range, and total coloring. The light from the back of the photosensitive material made of transparent glass reaches the plate where it is repeatedly reflected and refracted, and this miscellaneous light re-enters the photosensitive surface from the back side of the photosensitive material and causes it to be exposed. It is something that occurs.

To prevent this, the back bone plate must be made of a light-absorbing black material. However, this pins from the back)
:1 [Since it is impossible to perform [1], when adjusting the focus, remove a part of the photographic device and remove the plate for the back bone of the black member mentioned above, and instead remove the plate for the transparent back bone for focus adjustment. Put it on, then attach a light source and chart, and perform focusing and alignment work. bottle)? 14I! Once work J is complete, replace the back bone plate with one made of black material and reassemble.

As described above, in the conventional exposure apparatus, in order to adjust the focus of the imaging section, -11! I had to disassemble the parts and replace the plate for the photosensitive material receiver and the plate for the focus adjustment bone, so I assembled it.

Adjustment was difficult and took a lot of time.

[Means for Solving the Problems 1] The present invention provides accurate and accurate focusing in the imaging section of an exposure device.
The object of the present invention is to provide an exposure apparatus that can be quickly and easily adjusted.

An exposure apparatus of the present invention that achieves the above object is an exposure apparatus that scans and exposes a document surface to form an image of the document image on the photosensitive surface of a photosensitive material, in which a support member that supports the photosensitive material at an image forming position is detachable. It is a unique feature that has been set up.

[Example ] Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

1 is a cross-sectional view of the imaging section of the exposure apparatus according to the present invention, showing a state in which a photosensitive material S being transported is exposed with a light beam from an original to form a copied image.

FIG. 3 is an exploded perspective view of the imaging section. It should be noted that the reference numerals used in these drawings are the same as those in FIG. 5, and the same reference numerals are given to structural parts.

A transparent lath plate 11 that is in contact with the photosensitive surface of the photosensitive material S is fixed to the frame 12 between two pairs of conveyance rollers 33, 38 and 39, 39 that are pressed into contact and driven to rotate and convey the photosensitive material S. has been done. Bending surfaces 12A at both left and right ends of the frame 12
, 12B are fixed to support plates 13 and 14, respectively, and are integral with each other.

Two positioning reference holes 13A, 1 are provided on the outer support plate 13.
313 is drilled at a predetermined position. The reference hole 13A,
13B is removably fitted into base bins IOA and 16B provided at predetermined positions of the outer fixed wall body 15, respectively.

- Front side support plate 14 having the same shape as H1 support plate 13
Also, two reference holes 14A and 14B penetrate therethrough. These reference holes 14A and 14B are located on the holding plate 1 shown in the frontmost side.
It is located at the same position as the two screw holes 17A and +7B of 7.
Two machine screws 18 pass through these holes to secure the support plate 14.
and the holding plate 17 are fixed integrally. Note that one is a drawer handle attached to the front side of the holding plate 17.

Thus, the transparent plastic plate 11, the frame 12, the support plate 13,
14. The holding plate 17 is integrally constructed.

The retaining plate 17 is fixed at a predetermined position on the fixed wall body 20 located between the supporting plate 14 and the retaining plate 17.

17C, 17D are reference holes, 20C, 20D are screw holes, 2
1 are two machine screws that pass through these. Also, 2O
A is the frame 12. This is an opening that allows the support plates 13, 14, etc. to pass through. Furthermore, in the front fixed wall 22 which is integral with the fixed wall 15.degree. 20, there is an opening Y22A through which the required exposure light flux from the exposure device passes.

Next, 23 is a plate that supports the back surface of the photosensitive material S, and is set parallel to the stepped surface of the transparent glass plate 11 with a predetermined gap (for example, 0.5+++n) maintained therebetween. That is, in the back support, both left and right ends of the plate 23 form mounting parts 23A and 23B bent at right angles, and the outer dimensions of both mounting surfaces are made to be the same dimension as the inner distance between the support plates 13 and 14. It can be inserted and removed freely. Also, the mounting portion 23A.

Reference holes 23C and 23D are drilled in 23B,
When the plate 23 is inserted inside the support plate 13.14, the back support matches the reference holes 13B and 14B. In this state, the back support plate 23 is fixed to the support plate 13.14.

The work of attaching and removing the plate 23 to the support plate 13.14 for the above-mentioned rear support is done in one piece. ＋'l configuration lath plate 1
1. Frame 12. Support plate 13.14. Holding plate 17, handle 1
9 to the front side and take it out from the opening 2OA of the fixed wall body 20.

The rear support is integrally constructed after the installation of the plate 23 is completed.When installing the imaging unit into the main body of the copying machine, hold the handle 19 and push it outward from the opening 2OA of the fixed wall 20. and insert the reference holes 13A and 13B into the base bottle 16A.
, 16B, and then insert the reference hole 17 of the retaining plate 17.
- Align -117D with the screw holes 20C and 20D of the fixed wall body 20 and fix it with the small screws 2].

When the limited exposure process is started in this assembled state, the photosensitive sheet S passes through the gap between the glass plate 11 of the imaging section unit and the rear plate 23 (for example, '), 5u+n+). After being exposed to light and forming a copy image, it is sent to the next development process.

The surface of the plate 23, that is, the surface that slides on the back surface of the photosensitive material S, is a black material or a black-treated surface, and the surface of the two-legged rear supporter slides on the back surface of the photosensitive material S, and the photosensitive layer and support layer of the photosensitive material S during exposure. The light that passes through is absorbed by this black layer.

When assembling or adjusting the copying device, the above-mentioned base plate 11
Perform focus adjustment so that the copied image is correctly focused near the photosensitive surface passing side.

FIG. 2 and Pt54 are a sectional view and an exploded perspective view of the imaging section when the focus is 1!4.

This is done by removing the back support plate 23 from the recording imaging unit 7 and replacing it with w! 4g, the unit is attached by VC.

The outer shape of the plate 25 for the rear support is as above? Although it has almost the same shape as the r-plane receiving plate 23, a rectangular opening is provided on its surface. A transparent plastic plate 26 is fitted into the opening, and its surface is substantially flush with the plate 25 on the rear support.

A film-like chart 27 for focus adjustment is adhered to the curved surface of the glass plate 26. Further, on the back side of the plus plate 2G, a tubular light source 28 is arranged and fixed on the back side of the back support &25 so as to be parallel to the last plate 26. As the tubular light source 28, a light source that generates little heat, such as a cold cathode tube or a fluorescent lamp, is suitable.

As mentioned above, the back support is plate 25. 〃Ras [26, Char) 27. The tubular light source 28 is an integrally constructed focusing unit.

The left and right ends of the plate 25 of the rear support plate 25 form mounting surfaces 25A and 25B bent at right angles, and the outer dimensions of both mounting surfaces are made to be the same as the inner spacing between the support plates 13 and 14. , can be inserted and removed freely. Further, reference holes 25C and 25D are bored in the mounting surfaces 25A and 25B, and when the plate 25 is inserted into the support plate 13.14, the rear support matches the reference holes 13B and 14B. . In this state, the back support plate 25 is fixed to the support plate 13.14.

When adjusting the focus, pull out the image forming unit from the copying machine main body, remove the plate 23 from the back holder, attach the focus adjustment unit in its place, and place it back into the copying machine main body, and insert it into the reference hole 13A.

25C into the reference bottles 16A and 16B.

Thereafter, the protection plate 17 is positioned and fixed to the fixed wall body 20 in the same manner as described above.

Next, when the chart 27 is illuminated with a 7α lamp from the tubular light source 28, the image of the chart is transmitted through the plus plate 11 and exits from the slit 22A through the sixth mirror 7°, the fifth mirror 6, the main lens 5. Second mirror unit 4゜First mirror unit 3
A projected lia image is formed on the document table by following the backlight path.

The positions of the optical system components (lenses, mirrors, etc.) are adjusted while viewing the projected image so that the projected image is correctly formed. Next, the focus is adjusted over the entire document surface while sequentially moving the optical system members in the scanning direction.

When the focus adjustment is completed, the focus 1 adjustment unit is replaced with the rear support plate 23 to enable copying operation.

In addition, the glass plate 11. The frame 12 may be fixed inside the main body of the copying apparatus, and the back support may have a structure in which the plate 23 and the focus adjustment unit are detachable.

L. Effects of the Invention) As described above, according to the exposure apparatus of the present invention, it is possible to accurately, quickly and easily adjust the focus of the image forming section of a copying device, so that the image quality of copied images is improved. , Adjustment 1B, ?
The interval is short, tl? Effects such as ``i'' are produced.

It is also easy to maintain since the positive plate of the marco imaging section can be easily cleaned and replaced and re-set accurately.

[Brief explanation of drawings]

fjS1 and V3 are a sectional view and an exploded perspective view of the imaging section of the exposure apparatus according to the present invention, and FIGS. 2 and 4 are a sectional view and an exploded perspective view of the imaging section during focus adjustment. FIG. 5 is an overall configuration diagram of the copying apparatus. 11.26:3:! L-light glass plate 12: Frame 1
3.14: Support plate 13^, 130.14^, 140.17C, 17D
, 23C, 23D, 25C, 25D: Base hole 15. 20, 22: Fixed wall body

Claims (1)

[Claims] What is claimed is: 1. An exposure device that scans and exposes a document surface to form a document image on a photosensitive surface of a photosensitive material, characterized in that a support member for supporting the photosensitive material at an image formation position is detachably provided.