JPS61261731A - Picture projector - Google Patents

Abstract

PURPOSE:To prevent the title device from accidents such as the collision and breakage of a mirror due to mistiming by moving an optical path switching reflecting mirror to the outside of the optical path while making said movement interlocking with the movement of a picture scanning reflecting mirror at the time of switching to a printer mode. CONSTITUTION:The 2nd and 3rd reflecting mirrors 14, 15 for picture scanning are fixed on a movable supporting plate 25 so that respective reflecting surfaces form 45 deg. angle and are arranged to be driven in the arrow direction by a wire. At the time of switching to the printer mode, the reflecting mirrors 14, 15 are moved in the obliquely upper direction from the arrow direction and the optical path switching movable relecting mirror 12 is moved to the outside of the opti cal path in the counterclockwise direction by a cam surface 25A. Then, the mirrors 14, 15 are moved in the reverse direction from exposure starting positions shown by the broken lines and the optical image of the reflecting mirror 11 is exposed and scanned on the drum 21. Consequently, the device can be prevented from accidents such as the collision and breakage of the mirror due to mistiming.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image projection apparatus that can be switched between a reader state in which an image is projected onto a screen and observed, and a printer state in which the image is projected onto an exposure section to obtain a copy image. .

[Technical background and purpose of the invention]

Conventionally, in this type of projection device, part of the reader optical path for projecting an image on a microfilm or the like onto a screen and the printer optical path for projecting that image onto a photoconductor have been used, and the reader state In order to switch between the state and the printer state, there is a method of switching between the two by installing a switching mirror on a common optical path and rotating this mirror to move it in and out of the optical path. However, it requires a driving device to rotate the mirror, and the structure is complicated, large, and expensive.

In addition, two scanning mirrors are arranged in the printer optical path, and the scanning mirrors sequentially reflect a portion of the imaging light flux to form an image of the slit-shaped portion of the image on the photosensitive medium of the exposure section. It is known that some printers use an exposure method that performs slit exposure of the photosensitive medium by moving a scanning mirror in a predetermined direction while passing the photosensitive medium through an exposure section at a constant speed. If the scanning mirror goes out of control when in the leader state, or if the timing between the scanning mirror's movement and the switching mirror's rotation is misaligned, the mirrors will collide with each other, damaging the mirror or damaging the device. There were drawbacks.

j,),,,I An object of the present invention is to solve the above-mentioned drawbacks by simplifying the structure of the device, thereby preventing damage to the optical system, damage to the optical system, etc. ．． An object of the present invention is to provide an image projection device that prevents damage to the device.

[Structure of the invention]

:1 The present invention projects an image onto the 7Cree 7, 1 observes the reader state, and projects the image onto the exposure section:
In an image projection device that can be switched to a printer state to obtain a copy image, an optical path switching reflective member that switches between a reader state and a printer state, and an image scanning reflective member that reflects an image to an allegorical light section: 1
Feature C1: 1. The optical path is cut by moving the image scanning reflecting member. ::I,! ″t6°, - [Example] □□ 14. (Hereinafter, the present invention will be explained with reference to the drawings.

, FIG. 1 shows a reader printer, in which 1 is a microfilm, 2 is a lamp, 3 is a reflector, 4 is a condenser lens, 5 is a field lens, and 6 is an imaging lens.

The entire surface of the microfilm 1 is illuminated with one frame image by a lamp 2, and the illuminated frame image is projected onto a reader optical path or a printer optical path via an imaging lens 6.

The reader optical path is the first reflecting mirror 11. Movable reflector for optical path switching 12. The printer optical path includes a first reflecting mirror 14, a second reflecting mirror 14, and a third reflecting mirror 15.
It is formed by

The reflecting mirrors 11, 12.13 are inclined by 45@ with respect to the optical axis of the imaging lens 6, and the reflecting mirrors 11.13 are fixed at the positions shown. The movable reflecting mirror 12 rotates about the axis 16 between the solid line position and the broken line position, and when placed in the solid line position forms a reader optical path, and when placed in the broken line position forms a printer optical path.

Second and third reflecting mirrors 14. The reflective surfaces of tb form an angle of 45° with each other, and they can integrally move back and forth between the solid line position and the broken line position in the direction of the arrow.

20 is a screen, 21 is a nine-photosensitive drum arranged in an exposure section, and 22 is a slit plate.

, the movable reflector 12 is at the solid line position 15 at the moment of the haze reader.
1. ．． ;I @C stationary, 2nd and 3rd reflecting mirrors 14.
15 is movable ゛, 4 y, lNi, it is stationary at the solid line position located behind the reflecting mirror 12, and the image light of the microfilm is passed through the imaging lens 6.
5 from the first reflecting mirror 11 to the movable reflecting mirror 12.
The image is projected onto the screen 20 via the fixed reflecting mirror 13.

'11 1'□' On the other hand, when the printer is in use, the movable reflector 12, j) is rotated counterclockwise to reflect the optical path indicated by the broken line:',,9'Kff d-7・1' f′
"1"・1°8-1""°111 Move in the direction of the arrow to the position indicated by the broken line, and when it is placed at the exposure start position indicated by the broken line position ≦, move in the opposite direction from that position: "Move 1'
z 111th mirror 1゛″cNitLft@＊+tma;・
The reflected light is reflected through the slit plate 22.
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,・≧(・.1) When the scanning exposure of the image is completed, the movable reflecting mirror 12 returns to the solid line position and switches to the radar mode.

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Exposure scanning is performed by moving in the direction of the arrow at a speed of 1/i2 of the circumferential speed of 2 degrees.

Around the photosensitive drum 21, well-known image forming means such as a charging device, a developing device, and a transfer device (not shown) are arranged, and copying is performed by electrophotography.

When the copying magnification is changed by changing the imaging lens, etc., the moving speeds of the second and third reflecting mirrors 14 and 15 may be constant regardless of the magnification.

Note that a one-dimensional image sensor (such as a COD) may be disposed in the exposure section, and the output of the image sensor may be sent to a laser beam printer to obtain a copy image.

The second and third reflectors [14 and 15 are fixed to a movable support plate 25, and the movable support plate 25 is connected to a motor that drives the photosensitive drum 21 via a wire (not shown). It is moved in the direction of the arrow along the illustrated rail. A curved cam surface 25A is provided at the right end of the movable support plate 25.
A movable reflecting mirror 1 is formed on this cam surface 25A.
The back surface of 2 is constantly pressed by a spring (not shown) or its own weight.

When the print button is turned on, the movable support plate 25 moves from the solid line position to the dashed line position, and as a result, the second and third reflecting mirrors 14.15 move diagonally upward together and engage with the movable support plate 25. The matching movable reflecting mirror 12 is lifted by the movement of the movable support plate 25 and rotated counterclockwise. When the second and third reflecting mirrors 14, 15 reach the exposure start positions indicated by broken lines, the movable support plate 25 stops moving, and the movable reflecting mirrors 12 are placed outside the projection optical path indicated by broken lines. Next, the movable support plate 25 moves in the opposite direction, thereby causing the second and third reflecting mirrors 14, 15 to move obliquely downward, and the movable reflecting mirror 12 to rotate clockwise. While the second and third reflecting mirrors 14 and 15 are moving from the dashed line position to the solid line position, the image on the microfilm is exposed and scanned onto the photosensitive drum 21, and when the solid line position is reached, the exposure operation ends. The movable reflector 12 returns to the solid line position and returns to the leader state.

In the printer state, the movable reflector 12 is attached to the movable support plate 2.
5, the movable reflector 12 is smoothly lifted by the cam surface 25A of the movable support plate, and the movable support plate 25
moves smoothly.

- The movable support plate 25 is in the leader state due to the configuration described above.
Even if the movable reflecting mirror 12 is moved by mistake, the movable reflecting mirror 12 rotates with the movement of the movable support plate, so there is no possibility that the reflecting mirrors will collide with each other and be damaged. Further, since there is no need to provide a special drive mechanism for rotating the movable reflecting mirror, the structure of the device is simplified.

FIG. 2 shows another embodiment of the present invention, and hereinafter, parts similar to those in the above embodiment are designated by the same reference numerals. A rotatable fourth reflecting mirror 30 is provided between the imaging lens 6 and the movable reflecting mirror 12, and a fixed fifth reflecting mirror 31 is provided in the optical path dedicated to the printer.

In the leader state, the fourth reflector 30 and the movable reflector 12
is placed at a predetermined position within the image projection optical path, and in this state, the image light that has passed through the imaging lens 6 passes through the fourth reflecting mirror 30.
．． It is reflected sequentially by the movable reflector 12, and then by the fixed reflector 13.
The light is reflected by the screen and projected onto the screen 20.

On the other hand, in the printer state, when the print button is turned on, the movable support plate 25 moves in the direction A, and the movable support plate 25 moves in the direction A.
When the cam surface 25A of No. 5 comes into contact with the back surface of the movable reflecting mirror 12, the movable reflecting mirror 12 rotates clockwise as the movable support plate 25 moves, and then when it comes into contact with the back surface of the fourth reflecting mirror 30, the movable reflecting mirror 12 rotates clockwise. As the support plate 25 moves, the fourth reflecting mirror 30 rotates in the direction of the hour hand, and when the second and third reflecting mirrors 14.15 are placed at the exposure start position, the movement of the movable supporting plate 25 stops and the fourth reflecting mirror 30 rotates in the direction of the hour hand. The situation shown in the figure is reached, with the reflector 12.30 placed outside the image projection optical path. Next, the movable support plate 25 moves in direction B opposite to direction A.
The image light that moves in the direction and passes through the imaging lens 6 is sequentially reflected by the second and third reflecting mirrors 14 and 15, and then reflected by the fifth reflecting mirror 3.
1 and is projected onto the photosensitive drum 21. As the movable support plate 25 moves in the B direction, the reflecting mirror 12, 304-1
: It rotates counterclockwise in the IT direction by its own weight or a spring, returns to the position of the afterlight after the image exposure to the photosensitive drum is completed, and is placed in the projection optical path. Reference numerals 35 and 36 denote stoppers that position the reflecting mirrors 12 and 30 at predetermined positions within the optical path, and this stopper restricts the rotation of the reflecting mirrors in the counterclockwise direction.

In the embodiment shown in FIG. 2, the second and third reflecting mirrors 14°15 are 9
It is supported by a movable support plate 25 at an angle of 0°,
The movable support plate 25 moves at a speed l of the circumferential speed of the photosensitive drum 1. Figures 4 and 5 show another embodiment in which the movable reflecting mirror is rotated in conjunction with the movement of the movable support plate. , in FIG. 4, the movable reflecting mirror 12 is provided on the cam plate 40,
The cam plate 40 is rotatable about a shaft 41. A roller 42 is rotatably provided on the movable support plate 25, and this p-roller 42 contacts the cam plate 40, and when the movable support plate 25 moves in the direction of the arrow, the cam plate 40ti moves with the movable reflecting mirror 12. They rotate together clockwise or counterclockwise, and the movable reflecting mirror 12 is placed outside the projection optical path or within the projection optical path.

In FIG. 5, a roller 46 is rotatably provided on a rotatable substrate 45 that supports the movable reflecting mirror 12, and this roller 46 contacts the cam surface 2" 25A of the movable support plate 25, and The movable reflecting mirror 12 rotates due to the continuous scanning movement of the second and third reflecting mirrors 14 .
15 moves smoothly and does not cause image blur. It is preferable that the cam surface of the cam plate 40 and the cam surface of the movable support plate 25 have a circular arc shape.

! ] [Effects of the Invention] 1- As described above, according to the present invention, there is no need to provide a special drive mechanism for driving the optical path switching reflection member, the structure of the device can be simplified, and the scanning Even if the reflective member runs out of control, damage to the device can be prevented.

[Brief explanation of drawings]

・'Pa',, 工. □□□1□-2-□72-+, :l
・FIG. 2 is a configuration diagram showing another embodiment. ・FIG. 3 is a diagram explaining the moving state of the reflecting mirror. FIG.
1:I and FIG. 5 are side views showing another embodiment in which the movable reflecting mirror for optical path switching is rotated. ,・)2 1°---74# A 6"°
°°゛° Imaging V7X::; 11・12・13・
14・15°°°”°°Reflector'11

Claims (1)

[Claims] In an image projection device that can be switched between a reader state in which an image is projected onto a screen for observation and a printer state in which the image is projected onto an exposure unit to obtain a copy image, a reflective member for switching an optical path is used to switch between the reader state and the printer state. An image projection apparatus comprising: a movable image scanning reflecting member that reflects an image to an exposure section, and the optical path switching reflecting member is moved by movement of the image scanning reflecting member.