JPS6332580A - Plate write copying device - Google Patents

Abstract

PURPOSE:To execute a copying to forms of various sizes by providing as an image forming lens, a variable power lens which can execute the variable power by moving in an optical axis direction for connecting a plate write surface and the surface of a photosensitive body, varying a focal distance, and keeping a distance between an object surface and an image surface constant. CONSTITUTION:Picture information of a sheet 1 illuminated by an illuminating device is made to form an image on a photosensitive body 10 through reflecting mirrors 7, 8 and an image forming lens 9, and copied by an electrophotographic device 11. In such process, the image forming lens 9 moves in the optical axis direction for connecting the plate write surface and the surface of the photosensitive body and is constituted of a variable power lens which executes a variable power by keeping a distance between the object surface and the image surface constant by the variation of a focal distance, therefore, a plate write area A can be copied by other magnification than that of a basic mode. That is to say, when the variable power lens 9 is in a position (a), the section l1 of the plate write surface 1 is enlarged and copied to the section d1 of the surface of the photosensitive surface. In the same way, when the variable power lens 9 is in a position (b), the section l2 of the plate write surface 1 is copied by the basic mode to the section d1 of the surface of the photosensitive body, and also, when the variable power lens is in a position (c), the section l2 is reduced and copied to a section d2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field of the Invention] The present invention relates to a board copying apparatus having a variable magnification lens as an imaging lens.

[Prior art and its problems] Conventionally, in a board copying device, an imaging lens is equipped with one that forms an image on a photoreceptor at a constant magnification, and the image information drawn on the entire board writing area a in FIG. Since the image was formed on the photoreceptor using an imaging lens, copies could only be made at a certain magnification.

[Means for Solving the Problems] In addition to the constant magnification copying described above, the present invention also changes the distance between the object plane and the image plane by moving in the direction of the optical axis connecting the printing board and the photoreceptor surface and changing the focal length. By providing a variable magnification lens as an imaging lens that can change the magnification while maintaining a constant magnification, it is possible to copy image information in the board writing area (A in Figure 2) onto a sheet of paper of various sizes. It is possible to make copies on the same paper. In addition, it is possible to reduce the size of the board area (a in Figure 2) by copying it to the size of the photoreceptor (hereinafter referred to as base mode). Information can be copied. For example, it is possible to paste an Al-sized manuscript onto a board and copy it onto A5-sized paper. On the other hand, it is also possible to enlarge and copy a portion of a board document relative to the base mode.

[Embodiment] Figure 1 is a schematic diagram of an embodiment of the present invention, in which 1 is a rolled sheet on which writing is written on a board, 2, 3, 4.5 are rollers that hold the writing sheet, and 6 is a light that illuminates the writing on the board. 7 and 8 are reflecting mirrors that bend the exposure optical path from the board to the photoreceptor; 9 is an imaging lens that forms an image of the image information on the board onto the photoreceptor; 10 is the photoreceptor; This is an electrophotographic device that copies image information.

In the above configuration, the image information of the sheet 1 illuminated by the illumination device 6 is imaged on the photoreceptor 10 via the reflecting mirror 7.8 and the imaging lens 9, and is copied by the electrophotographic device 11. In the above process, the imaging lens 9 moves in the direction of the optical axis connecting the printing board and the photoreceptor surface, and the focal length changes, thereby changing the magnification while maintaining the distance between the object surface and the image surface constant. Since it is composed of a lens, it is possible to copy the board writing area (A in FIG. 2) at a magnification other than the base mode. That is, when the variable magnification lens 9 is at the position a in FIG. 3, the section IL1 of the board 1 is enlarged and copied onto the section d1 of the photoreceptor surface (with respect to the base mode). Similarly, when the variable magnification lens 9 is at position b, the section 12 of the board 1 is copied in the fundamental mode onto the section d1 of the photoreceptor surface. Further, when the variable magnification lens 9 is at the position C, the section .degree. C.2 of the board 1 is reduced and copied to the section d2 of the photoreceptor surface (with respect to the fundamental mode).

As shown in Fig. 4, the variable magnification lens is perpendicular to the optical axis and moves in the longitudinal direction of the slit.
．． J24. By moving the variable magnification lens 9 in the longitudinal direction of the slit, the image J25 is enlarged and copied onto each section d3 of the photoreceptor surface. By controlling the copy start position of the board 1, it is possible to enlarge and copy a portion of the board area A.

[Effect of the invention] By moving in the direction of the optical axis connecting the printing board and the photoreceptor surface and changing the focal length, a variable magnification lens that can change the magnification while maintaining a constant distance between the object surface and the image surface forms an image. By providing it as a lens, it becomes possible to copy the image information in the board writing area (A in FIG. 2) onto sheets of various sizes, in addition to copying it onto sheets of a single size. In addition, the board area (
Since it is possible to reduce the copying mode (hereinafter referred to as the base mode) that copies a) to the size of the photoreceptor in Figure 2, it is possible to copy the image information on the board at a very small magnification. Can be done.

On the other hand, it is possible to make an enlarged copy of a part of a board document relative to the base mode, by pasting paper with an area smaller than the board area on the board lined up in the 8-fold direction of the sheet, and enlarging and copying a part of the base mode. By setting the magnification of the paper so that it is the same as that of the pasted paper and performing continuous copying, there is an effect that different original documents can be rapidly copied in succession.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the present embodiment, a board copying device, Fig. 2 is a perspective view of the board copying device, Fig. 3 is a diagram of the exposure optical path from the board to the photoreceptor surface (enlarged and reduced), and Fig. 4 shows an exposure optical path diagram in the longitudinal direction of the slit of a partially enlarged copy of a board document. In the figure, 1: writing board sheet, 2, 3, 4° 5: writing board sheet holding roller, 6: lighting device, 7° 8 reflecting mirror, 9:
Imaging lens (variable magnification lens), 10: photoreceptor, 11: electrophotographic device.

Claims (1)

[Scope of Claims] 1) A board copying device that includes an illumination means for illuminating a board and an imaging lens for projecting the board onto a photoreceptor, and that copies image information written on a board using an electrophotographic device. By a variable magnification lens, the imaging lens moves in the direction of the optical axis connecting the printing board and the photoreceptor surface, and the focal length changes, thereby making it possible to change the magnification while maintaining a constant distance between the object plane and the image plane. A blackboard copying device comprising: