JPS62291629A - Image forming device - Google Patents

Abstract

PURPOSE:To detect a shading state with a simple structure by arranging a shading member on an optical path to be used in common at the time of reading and printing and fitting a reflection part to a part of the shading member. CONSTITUTION:The shading device 25 is arranged on the common optical path to be used as a reader optical path and a printer optical path and the reflecting member 60 is fitted to a part of the shading area of a belt 30 to direct reflected light to a screen. When the belt 30 is moved, the upper edge of an aperture 30A and the lower edge of an aperture 30B are entered into the optical path to shade the optical path. When the belt 30 is moved moreover in the arrow direction to interrupt the projection of an image to the screen during the traveling of a film at the time of retrieval, the whole optical path is shaded and no image is projected to the screen. Thereby, only a part of the screen is brightened and the other part of the screen is darkened. Even of the whole optical path is shaded the state can be detected on the screen.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention The present invention provides a reader state in which an image on an image support such as a microfilm or sheet is projected onto a screen and observed, and the image is projected onto an exposure section. The present invention relates to an image forming apparatus that can be switched to a printer state to obtain a copy image.

[Prior art]

Generally, most of the images recorded on microfilm are negative images, and a so-called reversal development method is used to obtain a copy of a positive image from this negative image. In the reversal development method, when copying is performed using an electrophotographic copying method, development is performed by applying a developing toner having the same polarity as the electrostatic latent image to an electrophotographic photoreceptor on which an electrostatic latent image has been formed. In other words, after uniformly charging the photoreceptor, a negative image on microfilm is exposed to the photoreceptor, leaving a charge on the unexposed area of the photoreceptor, which is charged to the same polarity as the charge remaining on the exposed area of the photoreceptor. Development is performed by adhering the toner.

Microfilm with a negative image generally has a negative image recorded within one frame f of the microfilm, and the periphery of each frame is transparent, as shown in Figure 9. An opaque search mark M and a frame number N are each recorded. Generally, in reader printers that use microfilm, one
An area larger than a frame is projected onto the photoreceptor.

In such reader printers, when a negative image on a microfilm is projected onto a photoconductor and developed using a reversal development method, toner adheres to the area corresponding to the outside of one frame of the image on the photoconductor, causing the photoconductor to be damaged. A so-called black frame is recorded around the image above, as well as a search mark and frame number, which makes it look bad and reduces the commercial value of the copy.Furthermore, in the case of electronic photocopying, it consumes toner. There are problems such as an increase in the amount. To solve this problem, a mask with an aperture corresponding to the size of one frame of the microfilm can be placed on the surface of the microfilm, but with this method, the mask needs to be placed every time the size or reduction ratio of the image area changes. It is inconvenient to have to replace it, and since the frame number is no longer projected on the screen, it is no longer possible to search for information using this frame number.

As a method to solve the above-mentioned drawbacks, a method has been proposed in which a light shielding member is placed on a common optical path during league play and printer play to remove the black frame. However, according to this method, if the operator blocks the entire optical path with a light shielding member, nothing will appear on the screen. If the lighting section is completely blocked from the outside and you cannot see the leaked light,
If the operator forgets to block the light path with the light shielding member when the league printer is turned off and then turned on again and the lamp is turned on, the screen will be dark and an abnormality may occur due to the illumination lamp being disconnected. If the operator mistakenly performs extra work such as replacing the lighting lamp, or if the operator forgets to turn off the power after blocking the entire optical path with a light shielding member, Because the screen is dark, no one notices this, and the lamp remains on for a long time, causing discoloration of the film image due to the heat from the illumination lamp and potentially causing a fire.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that has a simple structure and can easily determine the light blocking state.

[Means to solve the problem]

The present invention provides an image forming apparatus that can switch between a league state in which an image on an image support is projected onto a screen by a projection lens and observed, and a printer state in which the image is projected onto an exposure section to obtain a copy image. , a light shielding member is disposed on an optical path that is common during league play and printer time, and a reflecting portion is provided in a portion of this light shielding member, which will be explained in more detail.

In Figure 2, F is a microfilm, 2 is a lamp,
3 is a reflecting plate, 4 is a condenser lens, 5 is a field lens, and 6 is a projection lens.

The entire surface of the microfilm F is illuminated with one frame image by the lamp 2, and the illuminated frame image is projected onto the league optical path or the printer optical path via the projection lens 6.

The reader optical path passes through the first reflecting mirror 11. It is formed by a movable reflecting mirror 12 and a fixed reflecting mirror 13 for switching the optical path, and the printer optical path is formed by a first reflecting mirror 11, a second reflecting mirror 14, and a third reflecting mirror 15.

The reflecting mirrors 11, 12, and 13 are inclined at 45 degrees with respect to the optical axis of the projection lens 6, and the reflecting mirrors 11, 13 are fixed at the positions shown. The movable reflecting mirror 12 rotates around the axis 16 between a solid line position and a broken line position, and when placed at the solid line position, forms a reader optical path, and when placed at the broken line position, forms a printer optical path.

The reflecting surfaces of the second and third reflecting mirrors 14φ15 form an angle of 45° with each other, and 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 photosensitive drum arranged in an exposure section, and 22 is a slit plate.

During the league, the movable reflecting mirror 12 is stationary at the solid line position, the second and third reflecting mirrors 14 and 15 are stationary at the solid line position located behind the movable reflecting mirror 12, and the image light of the microfilm is transmitted to the projection lens 6. The light passes through the first reflecting mirror 11, moves through the movable reflecting mirror 12, and is projected onto the screen 20 via the fixed reflecting mirror 13.

On the other hand, during printing, the movable reflecting mirror 12 is rotated counterclockwise and placed outside the optical path indicated by the broken line position, and the movable reflecting mirror 12 is
The reflecting mirror 14 and the third reflecting mirror 15 move in the direction of the arrow to the position shown by the broken line, and when placed at the exposure start position indicated by the broken line, the image light reflected by the first reflecting mirror 11 moves in the opposite direction from that position. The reflected light passes through the slit plate 22 and is scanned and exposed onto the photosensitive drum 21, which rotates counterclockwise. When the second and third reflecting mirrors 14 and 15 are located close to the solid line position, the scanning exposure of the image is completed, and then the movable reflecting mirror 12 returns to the solid line position and switches to the reader mode.

The second and third reflecting mirrors 14 and 15 move in the direction of the arrow at a speed of l/V7T of the circumferential speed of the photosensitive drum 21 to perform exposure scanning. If the copy magnification is changed due to replacement of the projection lens, etc.
The moving speed may be constant regardless of the magnification.

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.

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.

25 is a light shielding device for preventing toner from adhering to unnecessary areas on the photosensitive drum. The light blocking device 25 is installed at any position on the image projection optical path. In this embodiment, the light blocking device 25 is arranged on the common optical path of the league optical path and the printer optical path.

1 and 3 show details of the light shielding device 25,
The belt 3 includes an endless belt 30 that moves in the vertical direction.
0 is suspended between rotatable rollers 32 and 33. A first operating knob 36 is fixed to the roller 33. The operating knob 36 protrudes to the outside of the device main body 50, as shown in FIG. The belt 30 is made of a flexible opaque material such as rubber or cloth, and is maintained at a constant tension by parallel rollers 32 and 33. The rollers 32 and 33 are rotatably supported by a frame 51 fixed within the apparatus main body. The belt 30 has two penetrating apertures 30A and 30B located in overlapping relationship on the image projection optical path, the apertures 30A and 30B having the same size and need not be the same), to maximize the effectiveness of the image projection optical path. Is it equal to the luminous flux area?
It has a slightly larger size.

41 and 42 are reinforcing members fixed near the upper and lower edges of the opening 30A of the first belt, and prevent the edges from bending so that the upper and lower edges of the opening 30A are parallel to the axes of the rollers 33 and 32. . Similar reinforcing members are also provided near the upper and lower edges of the belt opening 30B.

A reflective member 60 is provided in a part of the light shielding area of the bell) 30. The reflecting member is arranged at a position such that when the entire optical path is blocked by the light blocking area of the belt 30, the light reflected by the reflecting member 60 placed in the optical path is directed toward the screen 20. The reflective member may be provided at an angle with respect to the belt 30 so that the reflected light from the reflective member is projected onto any position on the screen.

Note that the opening of each belt may be closed with a transparent material.

5, 6, and 7 explain the operation of the light shielding device 25. Normally, the belt 30 is placed in the position shown in FIG. 5, and the image from the film and the light around the image are 30, and the entire effective area of the negative image and its periphery can be projected onto the screen or photosensitive drum.

If you want to avoid forming a black frame during printing or erase a part of the image, rotate the operation knob 36 to move the belt 30 in the direction of the arrow (or in the opposite direction) as shown in FIG. . When the belt moves, the upper edge of the opening 30A and the lower edge of the opening 30B enter the optical path, thereby allowing the belt to block the light in the optical path corresponding to the portion where toner should be prevented from adhering.

In FIG. 6, light in the area A-B is blocked by the first belt. After this, when a printing operation is performed, toner no longer adheres to the portions of the photosensitive drum corresponding to the A-B area and the area outside of it.

If the belt 30 is further moved in the direction of the arrow, the portion of the image corresponding to the optical path blocked by the belt is no longer projected onto the photosensitive drum, and a copy of a portion of the image, that is, an edited copy, can be obtained. You can see on the screen which parts will be copied.

Next, when the belt 30 is further moved in the direction of the arrow in order to prevent the image from being projected onto the screen while the film is running during retrieval, as shown in FIG. is no longer projected on the screen, but the light ray R reflected by the reflecting member 60 is reflected on the screen 2.
Projected to 0. Therefore, as shown in FIG. 8, only a portion 63 on the screen 20 becomes bright and the other portions of the screen become dark. Therefore, the user can easily know that the entire image is being masked by looking at the bright area 63 on the screen, and even if the user changes while the belt 30 remains in this state, the new user will be able to see the screen. You can tell by looking at that all image light is blocked. Also, the previous user may have accidentally operated the operation knob 36, causing the belt 30 to
Even if you leave the entire optical path blocked by
The next user will know that the entire optical path is blocked.

The embodiment of the present invention described above was an example of masking only in the vertical direction of the screen, but for example, if the masking device of the embodiment is attached in a direction rotated 90 degrees around the optical axis, masking can be performed. Masking can be performed from the left and right directions, or masking can be performed independently from the top, bottom, left and right sides.

Furthermore, although a belt was used as the light shielding member in this example,
The present invention is not limited to this, and may also be applied to curtains, plates, liquid crystals, etc., which are known from steel force memos and the like. Furthermore, the rotation operation of the light shielding member may be replaced with an electric motor instead of the knob 36.

〔effect〕

As described above, according to the present invention, even if the entire optical path is blocked by the light shielding member, this condition can be easily seen on the screen, which prevents accidents such as mistaking the situation as cutting off the lamp and performing unnecessary work. can be prevented. Furthermore, the structure is extremely simple and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a light shielding device showing one embodiment of the present invention, FIG. 2 is a configuration diagram of a reader printer to which the present invention is applied, and FIG.
The figure is a perspective view of the light shielding device, FIG. 4 is a top view of the light shielding device, FIGS. 5, 6, and 7 are diagrams explaining the light shielding state, and FIG.
The figure is a perspective view of the reader printer, and FIG. 9 is a front view of the microfilm. 30... Belt, 60... Reflective member, 36... Operation knob.

Claims (1)

[Claims] In an image forming apparatus that can be switched between a reader state in which an image on an image support is projected onto a screen by a projection lens and observed, and a printer state in which the image is projected onto an exposure section to obtain a copy image, when the reader is - An image forming apparatus characterized in that a light shielding member is disposed on an optical path common to printers, and a reflecting portion is provided in a part of this light shielding member.