JPS6229783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reader printer that can be switched between a reader mode in which a film image is projected onto a screen and a printer mode in which the image is projected onto a photoreceptor.

Conventionally, in this type of reader printer, an image on a film is scanned by a pair of scanning mirrors provided on the image field side of an imaging lens, and this image is exposed and scanned onto a photosensitive drum that moves in synchronization with the scanning mirror. I am trying to get a copy by doing this. On the other hand, when projecting a film image onto a screen, the image light from the projection lens is received by a scanning mirror or a swinging mirror for changing the optical path, and the light reflected by this mirror is sent through another optical system. Although the image is projected onto a screen, there is a problem in that the mirror placed opposite the projection lens moves, which causes the mirror to move from a predetermined position during reader mode, causing the optical axis of the reader optical path to shift.
If the image projected on the screen is positioned within the print frame on the screen while the optical axis of the reader optical path is misaligned, then copying is performed.
Since the projected image deviates from a predetermined area on the photosensitive drum, there is a drawback that the copied image is missing and cannot be copied correctly.

Furthermore, when switching the optical path, the reader mirror that forms the reader optical path is moved back and forth into the optical path to form the reader optical path and the printer optical path, which makes the optical path switching mechanism complicated and reduces the size of the device. It was difficult to achieve this goal.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compact reader-printer that prevents missing copy images, simplifies the configuration of the device, and allows easy switching of optical paths. do.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 shows a reader printer to which the present invention is applied, in which 1 is a photosensitive drum that is rotated in the direction of the arrow at a circumferential speed V, 2 is a microfilm original, and 3 is a photosensitive drum that is rotated in the direction of the arrow.
is a lamp for illuminating microfilm 2,
4 is a condensing lens, and 5 is a projection lens.

A first reflecting member 10 is provided opposite to the projection lens 5 and receives light passing through the projection lens, and is installed obliquely with respect to the optical axis of the projection lens. 11, the light reflected by the first reflecting member 10 is transferred to a screen 12.
This is a second reflecting member that reflects light toward.

The first and second reflecting members 10 and 11 form a reader optical path for projecting the film image onto a screen.

A third reflecting member 13 is placed below the first and second reflecting members 10 and 11 at an angle of 45° with respect to the optical axis, and is movable in and out of the optical path between the projection lens 5 and the first reflecting member 10; A fourth reflective member 14 reflects the light reflected by the third reflective member 13 toward the photoreceptor 1 .

The third and fourth reflecting members 13 and 14 form a printer optical path for projecting the image on the film onto the photoreceptor.

The third and fourth reflecting members 13 and 14 form an angle of 90 degrees and move integrally in a direction perpendicularly crossing the optical axis of the projection lens 5 (in the direction of the arrow). In the reader mode, the third reflective member retreats outside the optical path of the projection lens and is placed behind the second reflective member 11 (solid line position), and in the printer mode, it enters the optical path (dashed line position), and the third reflective member・Fourth reflective member 13,1
4, the image on the film is transferred to the projection lens 5,
Exposure scanning is performed on the photosensitive drum 1 via the third and fourth reflecting members 13 and 14.

When the entire image of one frame is exposed on the photosensitive drum 1, the third and fourth reflecting members 13 and 14 move to the solid line positions and return to the reader mode.

The photosensitive drum 1 is composed of a three-layered photosensitive member in which a conductive layer, a photoconductive layer, and a transparent insulating layer are sequentially stacked, and has an insulating layer on the surface. This photosensitive drum is a primary charger 1
The microfilm is uniformly charged in step 5, and then the primary charge is eliminated by projecting image light of the microfilm in an AC or DC charger 16 having a polarity opposite to that of the primary charger 15, and then uniformly exposed to light by a lamp 17. , whereby an electrostatic latent image corresponding to the image is formed. The electrostatic latent image on the photosensitive drum 1 is developed by a developing device 18 and then transferred to a transfer paper 20 by a transfer device 19.

The third and fourth reflecting members 13 and 14 move together at a speed of V/2 in the printer mode, and this moving speed does not change even if the projection magnification is changed. Third
The reflecting member 13 is the projection lens 5 and the first reflecting member 10
When the third reflective member enters the optical path in between, the reader optical path is blocked by the third reflective member, a printer optical path is formed by the third and fourth reflective members, and when the third reflective member retreats outside the optical path, a reader optical path is formed,
The printer optical path is no longer formed.

When switching between the reader mode and the printer mode, the first reflecting member 11 for the reader optical path, which is disposed opposite to the projection lens, is fixed at a fixed position, so there is no fear that the optical axis of the reader optical path will shift. If you position the image at a predetermined position on the screen in reader mode and then issue a copy command, this image will be correctly projected onto the predetermined area of the photoreceptor, and even if you repeatedly switch modes, there will be no missing copies. doesn't happen.

Reference numeral 21 denotes an exposure amount control member, which consists of a pair of slit plates 30 and 31 shown in FIG. The pair of slit plates 30 and 31 move in the direction of the arrow as shown in FIG. 2 in synchronization with the movement of the projected image. 1st
The slit plate 30 is made of an opaque plate with an opening,
The second slit plate 31 is arranged on the slit plate 30, moves integrally with the first slit plate 30 in the direction of the arrow, and rotates about a fulcrum 32,
When moving, it moves in and out over the opening of the first slit plate 30. When the second slit plate 31 rotates about the fulcrum 32, the distance between the opening end 30a of the first slit plate 30 and the tip 31a of the second slit plate 31 changes, and as a result, the distance between the opening end 30a of the first slit plate 30 and the tip 31a of the second slit plate 31 changes. The exposure amount is controlled by adjusting the size of the slit opening. In addition, the slit plate 30,
31 may be divided into a plurality of parts, and the position of each divided slit plate may be adjusted individually, and the relative positions of the slit plates on both sides of the optical axis may be changed. Ends 30a, 30b of slit plates 30, 31
has a non-linear shape in the longitudinal direction of the slit in order to make the illuminance distribution in the longitudinal direction of the slit uniform in the exposure area on the photosensitive drum 1. 33 is a roller provided on the back surface of the second slit plate 31; 34 is a cam surface that controls the rotation of the second slit plate 31;
When it moves in the direction of the arrow, it moves along the cam surface 34, and the second slit plate 31 moves according to the shape of the cam surface.
rotates. The cam surfaces 34 are disposed at positions that do not block the image projection optical path, and in order to accurately control the rotation of the second slit plate 31, which is long in the direction perpendicular to the moving direction, cam surfaces 34 are provided at both ends of the slit plate 31 in the longitudinal direction. Each is provided. Slit plate 30,3
The moving speed of the third and fourth reflecting members 1 is proportional to the moving speed of the projected image, that is, the moving speed of the photosensitive drum 1.
It moves in synchronization with the movement of 3 and 14. 40,4
Reference numerals 1 and 42 indicate principal rays at the front, center, and rear ends of the projected image of the microfilm 2, and the exposure control member 21 moves in synchronization with the movement of the principal rays.

The shape of the cam surface is determined by the rotation of the second slit plate.
Settings are made to correct the effects of the positions of the illumination source, lens, and moving optical system to make the illuminance distribution in the scanning direction uniform. The size of the slit opening formed by the slit plates 30 and 31 is such that the rotation of the second slit plate expands the luminous flux whose principal ray is inclined with respect to the photosensitive drum compared to the luminous flux near the optical axis of the projection lens. Changes to That is, the brightness around the optical axis is corrected to match the brightness near the optical axis, thereby making it possible to obtain a uniform illuminance distribution in the scanning direction without losing illuminance.

3 and 4 show other embodiments of the exposure control member, in which 70 is a first slit plate having an opening 71, and 72 is a second slit plate slidably disposed on the first slit plate 70. An arm 73 is rotatably supported by a shaft 74 provided on the first slit plate 70 and a shaft 75 provided on the second slit plate 72. An arm 76 is rotatably supported at one end of the second slit plate 72. Roller 77 is a cam surface that engages with roller 76, and 78 is a spring that constantly presses roller 76 against cam surface 77.

The slit plates 70 and 72 move integrally in the direction of the arrow in synchronization with the movement of the projected image, and the second slit plate 7
2 moves, the roller 76 moves along the cam surface 77, and thereby the arm 73 rotates around the shaft 74 and moves between the solid line position and the two-dot chain line position, and the rotation of the arm 73 moves the second slit. board 72
slides along the first slit plate 70, and the distance between the end 70a of the first slit plate 70 and the end 72a of the second slit plate 72 changes. By making the cam surface 77 into an appropriate shape, the slit plates 70, 72
When moving, the size of the slit opening formed by the slit plates 70 and 72 corresponds to a change in the angle θ between the optical axis of the projection lens on the photosensitive drum and the principal ray of the light beam incident on the photosensitive drum. can be adjusted to make the illuminance distribution within the exposure area of the photoreceptor uniform in the scanning direction.

Note that the end surface of the slit plate may be brought into direct contact with the cam surface.

The end portion 70a of the first slit plate 70 has a convexly curved shape, and by setting the shape of the end portion 70a to a suitable non-linear shape, the photoreceptor can be A uniform illuminance distribution can be achieved over the exposure range.

FIG. 5 shows still another embodiment of the exposure amount control member, in which a pair of slit plates are respectively rotated during movement. In FIG. 5, a pair of slits 130 and 131 forming a slit opening are arranged on a moving table (not shown) that moves in the direction of the arrow in synchronization with the projected image, and the first slit plate 130 has a fulcrum 135. The second slit plate 131 is rotatable around the fulcrum 132. Rollers 136 and 133 are provided on the back surface of each slit plate 130 and 131, respectively, and the rollers 136 and 133 are always in contact with the surface of the cam 134. The slit plates 130, 131 move together with the moving table in the direction of the arrow, and when moving, the rollers 136, 1
33 moves along the cam 134, thereby rotating the first and second slit plates 130, 131 and changing the size of the slit opening. The first and second slit plates 130 and 131 move from the solid line position to the dashed line position, and the relative positions thereof change during movement.

According to the present invention, switching between the reader mode and the printer mode is achieved by simply moving the scanning reflection member of the printer optical system, which simplifies the optical system and eliminates the need for a special drive and control system. The system can be simplified and downsized, and troubles are less likely to occur.

In addition, the scanning reflection member of the printer optical system is retracted behind the reader optical system, which creates a large dead space when it is used as a reader, and moves into the reader optical path when it is used as a printer, so space inside the machine can be used effectively without wasting it. In addition, the mode can be switched simply by moving the printer optical system, and this together with the fact that the optical system scanning type reader printer can be made smaller and cheaper.

Furthermore, since mode switching is performed smoothly, it is possible to increase speed, and since the first reflective member for the reader closest to the film is fixed, there is no fear that the optical axis of the reader optical system will shift. As a result, it is possible to prevent copy images from being missing or misaligned.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a reader printer to which the present invention is applied, FIG. 2 is a configuration diagram of an exposure amount control member, FIG. 3 is a configuration diagram showing another embodiment of the exposure amount control member, and FIG. 4 is a configuration diagram of an exposure amount control member. FIG. 3 is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a configuration diagram showing still another embodiment of the exposure amount control member. 1... Exposure drum, 5... Projection lens, 10,
11, 13, 14... Reflective member, 12... Screen.

Claims (1)

[Claims] 1 In a reader printer that can be switched between a reader mode that projects an image onto a screen and a printer mode that projects an image onto a photoreceptor, there is a projection lens and a device that is fixed above the projection lens and reflects the light that exits the projection lens diagonally downward to the rear. A first reflective member for a reader, and a first reflective member for a reader that is disposed opposite to the screen across an optical path formed between the projection lens and the first reflective member for a reader, and that reflects light from the first reflective member toward the screen. a third reflecting member for the printer that is movable across the optical axis while being inclined at a predetermined angle with respect to the optical axis of the projection lens; and a third reflecting member for the printer that reflects light from the third reflecting member toward the photoreceptor. At the same time, the fourth reflective member for the printer that moves in conjunction with the third reflective member and the third reflective member for the printer are retracted behind the second reflective member for the reader and out of the optical path in the reader mode. In the printer mode, the driving means enters the optical path formed between the projection lens and the first reflective member for the reader and moves in a direction transverse to the optical axis in synchronization with the movement of the photoreceptor. reader printer.