JPH0614553Y2 - Image forming device - Google Patents

Description

Description: TECHNICAL FIELD The present invention is directed to an image forming apparatus capable of reading an image written on an image carrier such as a document or a screen and recording the image on a recording medium, and in particular, it is formed with a plurality of colors. The present invention relates to an image forming apparatus capable of recording an image in a plurality of colors.

2. Description of the Related Art For example, an image forming apparatus of the above type configured as a digital copying machine, a facsimile, an electronic board, or the like has been conventionally known. The electronic board is an image forming apparatus capable of copying an image, for example, handwritten on the screen surface to a recording medium such as recording paper, and is also called an electronic blackboard or the like.

First, an example of a general structure of a conventional electronic board for producing a monochrome copy will be described with reference to FIG.

An endless belt-shaped or endless film-shaped screen 103 wound around a driving roller 101 and a driven roller 102 provided on both sides of the machine casing 100 is exposed at a window 104 provided on a front surface of the machine casing. Serves as an image writing unit, and the written screen portion is driven and driven inward by the drive roller 101 driven by the drive motor 105 rotating at a constant speed. The back side of the machine frame 100 is shielded from light by the rear board 100a to form a dark room,
Inside, a light source 106 for illuminating the traveling screen, a mirror 107 for reflecting the reflected light of the screen illuminated by the light source, a lens 108 for passing the reflected light by the mirror, and a reading element including a CCD 109 are provided. ing. In the process of running the screen 103 on which writing has been completed, the screen is illuminated by the light source 106, and the reflected light is guided to the CCD 109 via the mirror 107 and the lens 108, and the image on the screen is transferred to the CCD 10.
The image is formed on the image pickup device 9, the CCD 109 performs the main scanning and the sub-scanning by the constant speed movement of the screen 103 to read an image, and an image signal is output, and a copy is created by this signal. An electronic board is often used in which the screen is unrolled from one roller, wound on the other roller, and an image is read in the scanning process.

By the way, it is convenient if images of different colors such as black, red, and blue can be reproduced on the screen surface with different colors by copying with this kind of electronic board. Therefore, if a color area CCD capable of detecting a color is used as the above-mentioned CCD 109, a color copy can be created by the output, but the color area CCD is very expensive.

In addition, the light source of the monochromatic electronic board described in FIG. 10 may be two light sources of different colors, or two filters may be inserted in the optical path by switching, and the screen may be switched while switching the light source or the filter at a constant cycle. It is possible to read and output image information of a plurality of colors by moving a single CCD, but this is not practical because the system speed becomes slow.

Therefore, as shown in FIG. 1, in the electronic board shown in FIG. 10, two lenses 8 and 9 in the direction corresponding to the main scanning direction are provided in the optical path of the light from the screen surface, and corresponding to each of them. For example, by arranging the reading elements composed of the CCDs 13 and 14 so that the light receiving surfaces are aligned on a straight line corresponding to the main scanning direction and inserting the filters 6 and 7 of different colors into the optical paths of the light fluxes entering the respective CCDs. It is conceivable that an image of a predetermined color on the same line on the screen is simultaneously read by different CCDs 13 and 14 and the image information signal of each color is output.

By the way, the conventional monochromatic electronic board has a screen 10
The image written on 3 is sent to one C via one lens.
The image is read by forming an image on a CD, and the screen 103
As long as the entire width W of the image to be read (FIG. 10) is within the reading range of the CCD, virtually any part can be read, and the position adjustment of the CCD and lens is easy.

However, in the above-described multicolor electronic board, light beams are made incident on different CCDs by a plurality of lenses to read images on the same reading line L (FIG. 1) on the screen, and those signals are used to print on the same recording paper. Since each color image is recorded on, the relative position of each color image on the copy does not match that on the screen unless the read line L on the screen read by each CCD is completely aligned, and each color image is displaced or overlaps with each other. Or a malfunction occurs.

The electronic board whose image carrier is composed of a screen has been described as an example, but the above is also applicable to an image forming apparatus such as a digital copying machine or a facsimile which reads an image on an image carrier composed of a document. .

The purpose of the present invention is to solve the above-mentioned conventional problems at all and to easily adjust each element so that a plurality of reading elements can surely read an image on the same reading line on an image carrier. An object of the present invention is to provide an image forming apparatus capable of achieving the above structure and having a simple structure.

In order to achieve the above-mentioned object, the present invention runs an image carrier on which an image is written, and in the process, an image of a predetermined color on the same reading line on the image carrier is transferred to a plurality of reading elements. An image forming apparatus that forms an image, outputs an image information signal of each color, and records in a plurality of colors. The image forming apparatus forms a plurality of lenses for forming an image of the reading line on each reading element, and holds each lens. Each of the holders that are supported so as to be adjustable in the direction of the optical axis of the lens, respectively, and the lens blocks that support the reading elements, and the optical axes of the lenses supported by the lens blocks. And a common pedestal that supports each of the reading elements so that the reading elements can be adjusted in each direction, and each reading element is adjusted and moved in a direction corresponding to the main scanning direction of the reading line. The main scanning direction adjusting means, the sub-scanning direction adjusting means for adjusting and moving each reading element with respect to each lens block in a direction corresponding to the sub-scanning direction of the reading line, and at least one reading element, An image forming apparatus provided with an inclination position adjusting means for inclining the lens with respect to the optical axis is proposed.

Embodiment Hereinafter, an embodiment in which the present invention is applied to an electronic board will be described in detail with reference to the drawings.

2 and 3 show an electronic board for forming an image of a predetermined color on the same reading line on the screen by means of two lenses on the reading element composed of the two CCDs described in FIG. It is a figure which shows the Example to which a device is applied.

As is clear from the above description, the electronic board shown in FIG. 1 runs an image carrier including a screen 103 on which an image is written, and in the process, a predetermined line on the same reading line L on the screen 103 is run. The image of the color of CCD1
Forming an image on each of the two reading elements 3 and 14,
The image information signal of each color is output, and recording is performed in a plurality of colors.

As shown in FIGS. 2 and 3, the reading line L (first
A plurality of images formed on each CCD 13, 14,
In the illustrated example, the two lenses 8 and 9 are held by respective cylindrical holders, and these holders are supported by the lens blocks 2 and 3, respectively. The lens blocks 2 and 3 are supported by a common pedestal 1 and are attached to the electronic board body frame via the pedestal 1.

Filters 6 and 7 of different colors, that is, blue and red in the illustrated example, are attached to the front surfaces of the lenses 8 and 9 via a mounting bracket in a holder of each lens. One CCD 13 constituting the reading element is mounted on the CCD substrate 15, and the other CCD 14 is mounted on the CCD substrate 16.

Images on the same reading line L on the screen 103 shown in FIG. 1 are imaged on the CCDs 13 and 14 via the blue filter 6 and the red filter 7, respectively, and black, red, and A blue recorded image is obtained. One of the filters may be omitted, for example the red filter 6
May be omitted, and black and red recorded images may be obtained.

As described above, the same reading line L on the screen 103
The means for performing position adjustment in the main scanning direction, position adjustment in the sub-scanning direction, focus adjustment, magnification adjustment, and CCD tilt adjustment so that the above image can be read by the CCDs 13 and 14 are as follows. It is provided as follows.

First, the images of the same range on the same reading line on the screen 103 are transferred to the CCDs 13 and 8 by the lenses 8 and 9, respectively.
From the main scanning direction adjustment position for adjusting and moving the CCDs 13 and 14 in the direction corresponding to the main scanning direction of the reading line (direction of arrow A) with respect to the lens blocks 2 and 3 so as to form an image on 14. explain.

The CCD substrate 15 to which the CCD 13 is attached is attached to the adjusting plate 10 attached to the rear surface of the lens block 2 by three studs 40 and screws 41 screwed to the studs 40. The left end of each stud 40 in FIG. 2 is fixedly fixed to the adjusting plate 10, and the right end of each stud 40 is a CCD.
A mounting hole 20 that is in contact with the substrate 15 and is formed in the substrate 15
A screw 41 is screwed into a screw hole of each stud 40 through (see FIG. 4), whereby the substrate 15 is attached to the adjusting plate 10.

On the other hand, the CCD substrate 16 to which the CCD 14 is attached is attached to the adjusting plate 11 attached to the rear surface of the lens block 3 on the leaf spring 12 whose one end 12a is fixed via three studs 42 and screws 43. Has been. The relationship between the studs 42 and the screws 43 is that the left end of each stud 42 is fixed to the leaf spring 12 as described above.
0 and screw 41 are the same. In this way each CCD1
The lenses 3 and 14 are supported by the lens blocks 2 and 3, respectively.

As shown in FIG. 4, the above-described mounting hole 20 formed in the CCD substrate 15 is a long hole in the direction of arrow A. The other CCD substrate 16 is also formed with a mounting hole in the same shape as a long hole.

Next, a method of adjusting the position of each CCD 13, 14 in the A direction will be clarified.

First, each stud 4 that is erected on the adjusting plate 10 or the leaf spring.
0, 42 to the right end of FIG.
16 and bring the screws 41 and 43 from the right side in FIG.
It is inserted through each mounting hole 20 formed in each substrate 15, 16 and each screw 4 is inserted in the central screw hole of each stud 40, 42.
1, 43 are screwed, but they are not tightened. That is, the CCD substrates 15 and 16 are connected to the adjustment plates 10 and
11 is slidable in the A direction with respect to 11. At this time, the adjusting plates 10 and 11 are temporarily fixed to the lens blocks 2 and 3 by screws 26a and 27a shown in FIG. 7 and described later.

On the other hand, as shown in FIG. 4, each CCD substrate 15 has a long hole 21 formed in the direction orthogonal to the A direction, and the other CCD 21
The same long hole is also formed in the substrate 16 (fifth
Figure). As shown in FIGS. 1 and 5, eccentric cams 22 and 122 rotatably supported by the adjusting plates 10 and 11 are fitted into these elongated holes 21, respectively. These eccentric cams 22,
By rotating 122, the CCD substrates 15 and 16 carrying the CCDs 13 and 14 move in the A direction, and
The position of the CD in the A direction can be adjusted. That is, each C in the direction of arrow a on the screen 103 shown in FIG.
The same reading line position read by the CDs 13 and 14 can be matched.

After the adjustment, the screws 41 and 43 are tightened in the screw holes of the studs 40 and 42, and the CCDs 13 and 14 and the CCD board 1 thereof are
5 and 16 are fixed to the adjusting plates 10 and 11, respectively. The operation of the spring 12 will be described later.

As described above, in this example, the adjusting plates 10 and 11 and the stud 4 are used.
0, 42, screws 41, 43, mounting holes 20, elongated holes 21, and eccentric cams 22, 122 adjust each reading element with respect to each lens block in a direction corresponding to the main scanning direction of the reading line. The main scanning direction adjusting means is configured.

Next, each CCD 13, 14 is connected to each lens block 2,
3, the sub-scanning direction adjusting means for adjusting and moving in the direction corresponding to the sub-scanning direction of the reading line (the direction indicated by the arrow B in FIG. 3) will be described.

As shown in FIG. 7, each lens block 2, 3 has a mounting hole 26, which is an elongated hole extending in B corresponding to the sub-scanning direction.
27 is formed, and screws 26a and 27a are inserted therein and screwed to the adjusting plates 10 and 11, respectively. However, the adjustment plates 10 and 11 are temporarily fixed to the lens blocks 2 and 3 without tightening the screws 26a and 27a as described above until the adjustment is completed. That is, the adjusting plates 10 and 11 can be moved in the arrow B direction.

On the other hand, as shown in FIG. 6, jigs 39 serving as position references are brought near the adjustment plate 11 and fixed, and the adjustment plate 11 is pulled in the direction of each jig 39 by the spring 24. Further, the adjusting screw 23 is screwed into each jig 39, and the tip end thereof is in contact with the edge of the adjusting plate 11. Then, when the screw 23 is turned, the screw moves in the direction of the arrow B with respect to the jig 39, and accordingly, the adjusting plate 11 moves in the same direction, and thus the CCD 1 integrated with them.
4 can be moved in the B direction to adjust its position.

The position of the other adjusting plate 10 and the CCD 13 in the direction corresponding to the sub-scanning direction is adjusted in exactly the same manner as described above and shown in FIG.

In this way, the reading lines on the screen 103 read by the CCDs 13 and 14 can be matched so as not to shift in the direction of arrow b (FIG. 1). After this adjustment, screw 26
The adjustment plates 10 and 11 are fixed to the lens blocks 2 and 3 by tightening a and 27a, and the jig 39 and the spring 24 are removed to obtain the state shown in FIGS. 2 and 3.

A leaf spring (not shown) is interposed between the screw heads of the screws 26a and 27a and the lens blocks 2 and 3 to adjust the adjustment plates 10 and 11 even before tightening the screws 26a and 27a. To the lens blocks 2 and 3,
CC before and after tightening the screws from the screen 103
It is advantageous that the optical path lengths up to D13 and D14 are not changed so that the adjustment in the main scanning direction and the sub-scanning direction does not become out of order.

As described above, in this example, the adjustment plates 10 and 11, the mounting holes 26,
27, screws 26a and 27a, jig 39, spring 24, and adjusting screw 23 adjust the sub-scanning direction to move each reading element with respect to each lens block in a direction corresponding to the sub-scanning direction of the reading line. Constitutes a means.

Next, the focus is adjusted by moving the lenses 8 and 9 together with their holders with respect to the lens blocks 2 and 3 in the optical axis direction C of the lenses 8 and 9 as shown in FIG. The respective lenses 8 and 9 and their holders are fixed to the lens blocks 2 and 3 by screws (not shown).
The holders holding the lenses 8 and 9 are supported by the lens blocks 2 and 3 so as to be adjustable in the optical axis direction of the lenses, and the focus adjustment is performed by this configuration.

Next, for the magnification adjustment, the screws 2a and 3a for fixing the lens blocks 2 and 3 to the pedestal 1 are loosened respectively, and the lens blocks 2 and 3 are moved in the direction indicated by the arrow D in FIG. Then, the conjugate length is changed. In this case, the lens 8,
It is necessary to adjust so that the magnification by 9 becomes the same. In this way, the lens blocks 2 and 3 are supported by the common pedestal 1 so as to be adjustable in the optical axis direction C of the lenses 8 and 9 supported by the lens blocks 2 and 3, respectively. Done.

By the way, the CCD 14 is constructed by providing the CCD element 25 in the case as shown in FIG. 8. However, when the element 25 is inclined with respect to the case, the CCD 14 is correctly attached to the CCD substrate 16. And element 25 is C
It will be inclined with respect to the CD substrate 16. Even when the CCD element 25 is accommodated in the case of the CCD 14 without tilting, as shown in FIG.
If one side is attached to the board 16 in a floating state,
Naturally, the CCD element 25 is inclined with respect to the substrate 16. The same applies to the CCD 13.

To adjust the inclination, as shown in FIG. 2, the CCD substrate 16 to which the CCD 14 is attached is attached to the adjusting plate 11 via the leaf spring 12 as described above, and the inclination adjusting screw 19 is attached to the CCD substrate 1.
6 is rotatably inserted and screwed to the adjusting plate 11,
By rotating the screw 19, one side of the CCD substrate 16 is moved closer to or away from the adjusting plate 11 while bending the spring 12, and the CCD 14 is tilted with respect to the optical axis C of the lens 9, whereby the CCD 14 is moved. This is performed by making the inclination of the element 25 of the other CCD equal to that of the other CCD 13. It is preferable that the screw 19 be fitted in a long hole extending in the A direction of the CCD substrate 16 so that the screw 19 does not hinder the adjustment in the main scanning direction.

Of course, the same tilt adjustment may be performed on the CCD substrate 15 on which the CCD 13 is mounted, and both tilts may be adjusted to eliminate the tilt of both.

As described above, in this example, the spring 12 and the adjusting screw 19 constitute tilt position adjusting means for tilting at least one reading element with respect to the optical axis of the lens.

By performing the adjustment described above, the two CCDs 13,
The screen 14 can simultaneously read the images on the same reading line L on the screen 103 at a predetermined magnification.

In addition, by mounting the two lens blocks 2 and 3 on a common pedestal, it is possible to unitize the two reading optics and reading elements, and the service technician must re-adjust them if a failure occurs after delivery to the user. Instead, it can be dealt with by replacing the unit.

As shown in FIG. 2, a shading plate 1 that regulates the amount of light incident on each CCD in front of each lens block 2 and 3.
By fixing 7 and 18, it becomes unnecessary to adjust the position of the shading plate, which is necessary due to lens performance and assembly error when the lens block is replaced when it is mounted alone on the electronic board body, and the Correspondence becomes possible.

In the above-described embodiment, the electronic board having a configuration in which two CCDs are used to cause each CCD to read an image on the same reading line on the screen has been described, but three or more lenses are used. The present invention can also be applied to the case where an image of a predetermined color is read by each of three or more CCDs.

The embodiments in which the present invention is applied to an electronic board for reading an image on an image carrier composed of a screen and recording the image have been described above. The present invention, however, reads an image written on an image carrier composed of an original. It is obvious that the present invention can also be applied to an image forming apparatus such as a digital copying machine or a facsimile machine that records by recording.

Effects As described above, according to the present invention, an image written in a plurality of colors can be reproduced as a copy of a plurality of colors while maintaining the same positional relationship. Moreover, since the holder that holds each of the plurality of lenses and the plurality of reading elements are respectively supported by the lens blocks, and these lens blocks are supported by the common pedestal, and the whole is unitized, the structure of the image forming apparatus is configured. Can be simplified, and each adjustment work can be performed without any trouble.

[Brief description of drawings]

1 is an explanatory view showing a reading optical system of an electronic board according to an embodiment of the present invention, FIG. 2 is a partial sectional front view of a reading unit according to an embodiment of the present invention, and FIG. 3 is a III-III of FIG. FIG. 4 is a view seen from the left side of FIG. 2, and FIG. 5 is an eccentric cam second view.
FIG. 6 is a partial view seen from the right side of the drawing, FIG. 6 is an explanatory view for explaining the adjustment operation in the sub-scanning direction, and FIG. 7 is a partial view seen from the left side of FIG. 2, in which a shading plate and the like are omitted. And shown the figure,
8 and 9 are explanatory views for explaining the inclination of the CCD, and FIG. 10 is an explanatory perspective view showing the configuration of a typical optical system of the monochromatic electronic board. 1 ... pedestal, 2, 3 ... lens block 8, 9 ... lens 17, 18 ... shading plate A ... direction, B ... direction C ... optical axis, L ... reading line

Claims (2)

[Scope of utility model registration request] 1. An image carrier on which an image is written is run,
In the process, an image forming apparatus for forming an image of a predetermined color on the same reading line on the image carrier on each of a plurality of reading elements, outputting an image information signal of each color, and performing recording in a plurality of colors, A plurality of lenses for forming an image of the reading line on the respective reading elements, and respective holders holding the respective lenses are movably supported in the optical axis direction of the lenses, and the respective reading elements are respectively For each lens block, a lens block to support, a common pedestal that supports these lens blocks to be adjustable in the optical axis direction of the lens supported by each lens block, and each reading element The main scanning direction adjusting means for adjusting and moving the main scanning direction in the direction corresponding to the main scanning direction of the reading line, and each reading element with respect to each lens block. An image characterized in that sub-scanning direction adjusting means for adjusting and moving in a direction corresponding to the sub-scanning direction and tilt position adjusting means for tilting at least one reading element with respect to the optical axis of the lens are provided. Forming equipment. 2. The image forming apparatus according to claim 1, wherein a shading plate for restricting the amount of light incident on each reading element is provided on each of the lens blocks.