JPH06100769B2 - Copying device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical apparatus, and more particularly to a copying apparatus using an adapter type optical apparatus that forms a new optical system by adding another lens unit to an optical path. Is.

(Prior Art and Problems) Conventionally, an imaging lens system for an apparatus for forming an image using a lens, for example, a microscope, a television camera for a studio, a television camera for a home, a single-lens reflex camera, a copying apparatus or other optical measuring apparatus. There is a configuration in which the image forming magnification is changed or a special effect is given by replacing a part of the lens or by adding another lens, a lens unit or a filter to the lens system. .

Even in an electronic copying machine, which is one of copying machines, it is possible to change the copying magnification by moving a lens in and out of the optical path.

The above optical device requires a relatively large space because it requires a storage space for a lens to be exchanged (hereinafter referred to as an adapter lens), a retract space, and an exchange device.

(Purpose) The present invention reduces the space required for exchanging the above-mentioned adapter lens and reduces the size of the entire copying apparatus.

(Structure) The present invention to achieve this object is a copying apparatus having a document table and an optical unit for irradiating a photoconductor with image light obtained from a document placed on the document table. There is provided a lens unit having a pair of zoom lenses arranged in parallel with a space portion, and the lens unit is an axis in the optical path of the image light irradiated on the photoconductor and perpendicular to the optical path. It is possible to rotate about the rotation axis provided between the magnification lenses, and when using the magnification lenses, it is rotated to the position where the image light passes through both magnification lenses, and the magnification is changed. When the lens is not used, it is characterized in that the space between the zoom lenses is rotated to a position where the image light passes.

(Example) An example of application to an electronic copying machine will be described below as one example of the present invention.

The electronic copying machine described here is an electronic copying machine that performs slit exposure, and by adding an adapter lens such as a cylindrical lens and a toric lens in the optical path of the optical system using a zoom lens, the scanning direction of the original It is possible to make a copy image having a different magnification and a magnification in a direction perpendicular to the scanning direction. With the above adapter lens,
It is possible to convert a circle into an ellipse and an ellipse into a circle, and a manuscript placed at an angle can be converted into a distorted shape, and an interesting design can be created from one original manuscript. In addition, when an image is present on the full document, it is possible to reduce the size in only one direction to create a binding margin, or to create a margin for writing a memo. In addition, it is possible to print legal size originals on letter size and A4 size transfer paper with the aspect ratio converted. Hereinafter, copying on a transfer sheet with an aspect ratio different from the aspect ratio of the original document as described above is referred to as uneven magnification copying.

FIG. 1 and FIG. 2 are schematic views of an electrophotographic apparatus for performing partial magnification copying. A document 2 placed on the document table 1 is illuminated by a lighting device 3. The platen 1 moves at a constant speed in the direction of arrow a. The light reflected on the document surface passes through the slit 4, passes through the first mirror 5, the zoom lens 6, and the second mirror 7,
An image is formed on the photosensitive drum 8. The photosensitive drum 8 rotates in the direction of arrow c at a constant speed, and the image on the original is exposed as needed. The latent image formed on the photosensitive drum 8 by the above exposure is transferred to a transfer paper after development by a developing device and a transfer charger (not shown). The image on the transfer paper is fixed by a fixing device (not shown), and the transfer paper is discharged to the outside of the copying machine.

The magnification ratio k for enlargement and reduction can be arbitrarily changed by moving the zoom lens 6 in the direction of arrow b and performing zooming in the zoom lens. Also,
In this case the circumferential speed of the photosensitive drum 8 and [nu _0, the moving speed of the platen 1 is set to [nu ₀ / K.

The above is the case where the document is scanned in the same direction as the document's aspect ratio and in the direction perpendicular to the document scanning direction, that is, in the slit direction.

Next, a case of performing partial magnification copying will be described. As shown in FIG. 1, an adapter lens 9 is supported between the second mirror 7 and the photosensitive drum 8 so as to be rotatable about a rotation shaft 10. Of course, the rotation axis 10 itself exists outside the optical path.

FIG. 3 shows a schematic view of the adapter lens 9. The adapter lens 9 comprises a first lens 11 and a second lens 12. The first lens has a concave lens in the short side direction on the light entrance side, a convex lens in the long side direction on the light exit side, and a second lens on the light entrance side.
Both the light exit surface side are convex lenses in the short side direction. Here, the magnification in the long side direction, that is, the slit direction is 0.96 times, and the magnification in the short side direction, that is, the scanning direction is 0.68 times. The first lens 11 and the second lens 12 are fixed with a space. Apertures 13 and 13 'are provided in a direction perpendicular to the optical axis e of the adapter lens 9.

When performing general variable-magnification copying, the optical axis e of the adapter lens 9 is perpendicular to the optical axis f of the zoom lens 6 as shown in FIG. The light passing therethrough and reflected by the document surface reflected by the second mirror 7 passes through the openings 13, 13 ′ and is focused on the photosensitive drum 8.

When the adapter lens 8 is rotated in the direction of arrow d, the arrangement is as shown in FIG. Optical axis e of adapter lens 9
Coincides with the optical axis f of the zoom lens 6. The light reflected by the first mirror 5 passes through the zoom lens 6, and the light reflected by the document surface reflected by the second mirror 7 passes through the entrance aperture 14, the first lens 11, the second lens 12, and the exit aperture 15. Then, an image is formed on the photosensitive drum 8. When the magnification by the zoom lens 6 is k, the magnification of the formed image is 0.96 × K times in the slit direction and 0.68 × K times in the scanning direction. When the adapter lens 8 reaches the position shown in FIG. 2, it is detected by the adapter lens detection mechanism (not shown) that the image is in the defocused state, and the moving speed of the platen is switched to ν ₀ /(0.68×K), and Control of the original scanning end position, position adjustment of the leading edge position of the transfer paper and the leading edge of the latent image on the photosensitive drum 6, control of process conditions corresponding to light amount reduction by the adapter lens, and the like are performed.

In the above-mentioned embodiment, a lens assembly using a cylindrical lens that has different magnifications in two directions intersecting at right angles is used as the adapter lens, but two circular lenses are used to magnify at the same magnification in all directions. The same effect can be obtained even with a reducing lens.

Further, although the above-mentioned embodiment is applied to the electronic copying machine, any copying apparatus using a lens can obtain the same effect.

(Effect) As mentioned above, when not using the adapter lens,
Light is passed between the lenses in the adapter lens, and when used, the adapter lens 9 is rotated so that the light passes through the lens of the adapter lens. Compared with the adapter lens, the switching mechanism, the moving space, and the space occupied by the adapter lens can be made smaller, and the switching mechanism can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an electronic copying machine when an adapter lens is not used, FIG. 2 is a schematic diagram of an electronic copying machine when an adapter lens is used, FIG. 3 is a schematic diagram of an adapter lens, and FIG. Explanatory drawing of an example of using a conventional adapter lens. 2 …… Original 1 …… Original plate 4 …… Slit 6 …… Zoom lens 9 …… Adapter lens 11 …… First lens 12 …… Second lens 10 …… Rotating shaft 8 …… Photosensitive drum 13, 13 ′… … Aperture

Claims (1)

[Claims] 1. A copying apparatus comprising a document table and optical means for irradiating a photoconductor with image light obtained from a document placed on the document table, and a space portion is provided between them to arrange them in parallel. The lens unit is provided with a pair of zoom lenses, and the lens unit is a rotation axis provided between the zoom lenses in the optical path of the image light irradiated on the photoconductor and perpendicular to the optical path. It is possible to rotate around the axis, and when using the magnification changing lens, it is rotated to the position where the image light passes through both magnification changing lenses, and when not using the magnification changing lens A copying apparatus characterized by rotating a space between lenses to a position where image light passes.