JPS5930530A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the position deviation of the image projected on a photosensitive drum by providing a means for detecting the direction of the film image for matching the positions of the film image and a transfer material. CONSTITUTION:The light from a light source 19 of a detector CL is imaged with a lens 20 on the bottom surface of an original placing plate 17 of an aperture mask 1 supporting a film F, and the reflected light thereof is conducted with a lens 21 to a photodetector 22. The level difference between the photographic film F and the mask 1 is detected and the directions F1, F2 of the film are detected. The timing for paper feeding is controlled according to the detected direction, and the matching of the positions between the film F and transfer paper is accomplished. The deviation of the position of the image projected on the photosensitive drum is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and particularly to an image forming apparatus suitable for processing a slide (hereinafter referred to as a slide) in which a film image is attached to an aperture mask.

After exposing a photoreceptor having a photoconductive layer on its surface to a pattern, a well-known electrophotographic method is used to form an image corresponding to the pattern on a transfer material. It has already been proposed to transcribe it into .

For example, in the case of a 55 mm film, this type of slide is designed to form an aperture film surface with long and short lengths of approximately 34.5 mm and 22.5 mm, respectively, on a square mask with approximately 50 mm sides. Specified ( yrs-
(See items 4 and 5 of B7163) 0 Having a mask with a square outer shape is convenient for organizing slides, continuous processing using a projector, etc.; An inconvenience arises when there is no need to use the external shape of the mask and the size and shape of the actual film is a problem, such as when making copies on materials. This is explained in the attached drawing. This is briefly explained by. FIG. 1 schematically shows an image forming apparatus 1 for obtaining a color copy from a photographic film as described above, in which a slide 1 placed on a base (not shown) is irradiated by a light source 2. Scan in the direction of arrow A. The transmitted light is mirrored
M2 + M31 M41M5 passes through the color separation filter 5 and exposes the photosensitive drum 4 of three colors to form an electrostatic image.On the other hand, the transfer material is supplied one by one from the cassette 8 and transferred to the register roller 9. Image 1 of the photoconductor surface by
i/, are supplied to the transfer drum 7 at different positions and timings, are supported by an appropriate gripper (not shown), are wound around the drum 7, and run.

A latent image corresponding to the color separation filter B is formed on the surface of the photosensitive drum 4, and this latent image is transferred to a developing device B having toner of five colors of cyan, macenta and yellow, which corresponds to the color of the color separation filter B. A color image can be obtained.

The transfer drum gripping the transfer material is rotated the required number of times by 11 PJf, and each time it passes the transfer electrode 11, toner of each color is superimposed and transferred to obtain a color copy. The transfer material is then separated from the transfer drum 7, fed to a constant N position (not shown), and after the image is fixed thereon, it is discharged to the outside.

When images are formed and transferred on the photographic film supported by the aperture mask in the manner described above, the film frame attached to the mask is rectangular as described above, so as can be seen from Figure 2, the mask is When feeding in the direction of the arrow on the document tray, if the film frame is facing in the direction indicated by the symbol F□ shown by the solid line, or if it is facing in the direction indicated by the symbol F2, there is a symbol d at the leading edge position of 7. This will result in a difference equivalent to . Therefore, unless this difference is corrected, the position of the projected image on the photosensitive drum will shift by d (actually, the amount multiplied by the projection magnification), which will cause problems in transfer.

This invention was made in consideration of the points similar to those of the Ishoki era.

In FIG. 2, the image of the part indicated by 12 is represented by the symbol F
The hatched portions 13, 14, . i5°16 is where the photographic film or aperture mask is located. The aperture mask has t = 1.0 mm to 3.2 as shown in Figure 6.
It has a thickness of mm (specified in J Engineering 5-B7163). Now, assuming that the thickness of the film is ignored because it is very thin, the height difference between the aperture mask and the photographic film is half of t, that is, t/2=0.5 to 1.6 m'In.

Therefore, the hatched parts 13, 14° 15.1 in Figure 2
It is possible to easily know the orientation of the photographic film by detecting whether the aperture mask or photographic film is located in any part of 6 or by detecting the above-mentioned step.

Figure 6 shows a specific example of detecting the film position described above.
Reference numeral 7 denotes a document mounting table on which the photographic film 1 supported by an aperture mask is placed, and has an opening large enough to project the image of the photographic film 1 onto a photosensitive drum (not shown). Reference numeral 18 denotes a document placement plate for holding down the document placed on the document placement table 17 so that the document does not shift during exposure.

Next, the part indicated by the dashed line OL represents the detection device, and 1
9 is a projecting light source, 20 is a projecting lens, 21 is a receiving lens,
22 indicates a light receiving element, which is held integrally. 19 above. ．． The members indicated by 20, 21, and 22 are the projecting light source 1.
9 is formed on the lower surface of the aperture mask 1 on the side of the original table 17, and the image thereof is also formed on the light receiving element 22.

Now, when the photographic film portion is placed on the detection surface, the imaging position of the projecting light source 19 will shift due to the step t/2 described above, and this difference will be detected by the light receiving element 22, and the orientation of the photographic film will be determined by the sign F. □ or symbol F, it is easy to know which direction it is facing.0 From this detection result, in Fig. 2, when the slide is scanned in the direction of arrow A, the direction of F2 is opposite to the direction of F□. In the case of orientation, the timing of paper feeding can be delayed by an amount of d×(projection magnification).

This delay can be achieved either by forming an electrical delay circuit in the node and controlling it by operating a clutch means such as an electromagnetic clutch, or by controlling the clock by controlling the microcomputer in terms of software. It is possible to store it in memory and control it.

Will this align the positions of the photographic film and transfer material? It is possible to measure it.

It goes without saying that the detection mechanism CL can be placed either above or below the film so as not to obstruct the projection optical path of the film F.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an image forming apparatus using an aperture mask, FIG. 2 is a plan view showing the aperture mask, and FIG. 6 is an explanatory diagram showing the operation of a first configuration of a detection mechanism according to the present invention. 1. Aperture mask, 2. Projection light source, skewer color separation filter, 4. Photosensitive drum, 6. Camera viewing device, 7.
・Transfer drum, 8...Cassette, 9...Register roller, OL...Detection mechanism, 17...Mask mounting table, 19.
・Detection light source, 22... Light receiving element Fig. 1

Claims (1)

[Claims] In an apparatus for transferring a film image supported by an aperture mask to a transfer material, an image provided with means for detecting the direction of the film image for aligning the positions of the film image and the transfer material. Forming device.