JPS62182771A - Plate writing recorder - Google Patents

Abstract

PURPOSE:To reduce the aberrations of a lens accompanied with widening of the angle and to make a device convenient for movement by deviating the center position in the longitudinal direction of an image reading slit on a plate writing face from the optical axis of the focusing lens. CONSTITUTION:Though an electrophotographic copying machine body 50 and the plate writing face or the like are arranged in the conventional manner, a mirror system for bending the optical path is not used at all to obtain the same image as conventional. Since only the lens is protruded out of the plate writing face to the side and mirrors or the like are not used, the structure has a very small capacity. Thus, the device is made convenient for movement because it is made light-weight and small-sized, and the attaching adjustment of mirrors is made unnecessary to eliminate the degradation in picture quality and the reduction of the quantity of light due to mirrors.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field of the Invention) The present invention relates to a board recording device for recording image information written on a board.

(Conventional example) Figs. 5 and 6 are schematic diagrams of a board recording device which has the problem to be solved by the present invention. 5 is a schematic view of FIG. 5 viewed from arrow Ell A.

First, when recording on board 1, I will explain the names of each part and their roles. In the figure, 1 is a white or light-colored flexible plate surface member such as a wide synthetic resin belt, and roller 4
The bridge is erected between 1, 42, 43, and 44. The board of this member 1 is substantially flat in the vertical direction, and the roller 41
．． 42°43.44 (for example, roller 4
It is movable by rotating 1 in the direction of the arrow),
At this time, the information written on the board is illuminated by the lamp 3, read and scanned at the reading position B, becomes an image information light beam, is directed by the fixedly disposed imaging optical path bending mirrors 62 and 63, and is directed to the electrophotographic copying machine 50 by the imaging lens 60. An image is formed on the internal photosensitive drum surface 51. Then, the image information on the drum 51 is transferred to a transfer material by a well-known electrophotographic process, and the paper is ejected onto a paper ejection tray 52.

In a blackboard recording device using an electrophotographic copying machine with such a configuration, (1) the imaging optical path bending mirrors 62 and 63 are arranged diagonally, and the blackboard itself has a casing structure of 1 t, which is difficult to adjust; m(becomes t.

(2) The mirror 63 and the lens 60 protrude to the side of the board member, increasing the size of the entire device.

There were some drawbacks.

(Problems to be Solved by the Invention) The present invention provides an optical system for guiding the image information on the board member to the electrophotographic photoreceptor, and the present invention provides an optical system for guiding the image information on the board member to the electrophotographic photoreceptor. This solves the problem of devices with different centers of location.

(Means for Solving the Problems) The board recording device of the present invention illuminates an image on a board which is vertically movable and is set up so as to form a slit on a photoreceptor of an electrophotographic device using an imaging lens. It has an optical system that performs exposure and moves the center position of the image reading slit on the board in the longitudinal direction away from the optical axis of the imaging lens.

(Example) FIG. 7 is a diagram explaining the principle of the present invention.

In the figure, Ba is the same width as the width at the reading position B in FIG. 5, and the lens 60a is the same as the width at the reading position B in FIG.
The optical imaging performance is made to be equivalent to that of the lens 60 described above in the range of twice the angle of view. 51a is the photoreceptor 5 in FIG.
It is half the width of one side. The image at position Ba of the part that does not include light 1'd+61 is 51 on the drum that does not include the optical axis.
The image is formed on a. At this time, the image 51a on the drum is B
The image will be formed not directly under point a, but on the opposite side across the optical axis 61 of the lens.

The gist of the present invention is to incorporate this principle into a board recording device.

1 and 2 are schematic illustrations of the present invention. The electrophotographic copying machine body 50 and the board etc. are arranged in the same way as in the case of FIG. 5, but no mirror system for bending the optical path is used.
It is possible to obtain the same image as the apparatus shown in FIG. The only thing that protrudes beyond the board is the lens, and since no mirrors are used, the structure has an extremely small volume.

Therefore, (1) The amount is 1lIl and the size is small, making it convenient to move.

■No adjustment is required when installing the mirror, and there is no deterioration in image quality or reduction in light intensity due to the mirror.

3 and 4 are diagrams in which two mirrors are placed only at one end of the board in order to reduce the angle of view of the lens. This is an example in which the optical path from the lens 60a to the above-mentioned position B is lengthened, and only two tension rollers 41 and 42 are used for the board member.

In each of the above embodiments, a drum-shaped electrophotographic photoreceptor is used as an example, but the present invention is not limited to this, and it is also possible to add an optical system including a document mounting table and a document lens in addition to a board lens. , it may be possible to use it as an electrophotographic copying machine for copying conventional documents. Further, although the above description did not mention the image forming means around the photosensitive drum or the electrophotographic process, well-known means and processes may be used, and detailed description thereof will be omitted.

By the way, although the embodiment of the present invention has been described using an example in which the lens optical axis is not included in the image area, the amount of deviation between the image reading position B and the lens optical axis 61 may be changed depending on the image position on the board.

(Effects of the Invention) With the above configuration, (1) the angle of view of the imaging lens for board writing can be reduced, and the aberrations of the lens associated with widening the angle can be reduced;

■Since the optical path is close to the board, the volume can be reduced and it is convenient for movement.

There are other effects.

[Brief explanation of drawings]

Figure 1 is a front view of a device according to an embodiment of the present invention, Figure 2 is a side view of the device shown in Figure 1 viewed from six directions, Figure 3 is a front view of a device that is a modification of the present invention, and Figure 4. 3 is a side view of the apparatus shown in FIG. 3 as viewed from A, FIG. 5 is a front view of the recording apparatus that has the problem that the present invention aims to solve, and FIG. 6 is a side view of the apparatus shown in FIG. 5 viewed from six directions. FIG. 7 is a diagram illustrating the principle of the present invention. In the figure, 1 is a board member, 50 is a Shigeko photographic device, and 51
Reference numeral 60 indicates an electrophotographic photosensitive drum, and 60 indicates an imaging lens.

Claims (1)

[Claims] In an apparatus that illuminates an image on a board that is vertically movable and performs slit exposure on a photoreceptor of an electrophotographic device using an imaging lens to form a recorded image of the board. A board recording device characterized in that the longitudinal center position of the image reading slit is offset from the optical axis of the imaging lens.