JPS5834419A - Optical device for image formation - Google Patents

Abstract

PURPOSE:To obtain a compact and inexpensive image forming optical system, by providing a cylindrical mirror and a cylindrical lens orthogonal to the cylindrical mirror and satisfying the prescribed conditions for formation of an image. CONSTITUTION:A prescribed space is secured between a cylindrical mirror 2 set at the back of a lens 1 and a cylindrical lens 5 which is orthogonal to the mirror 2 so that coincidence is obtained for the center of curvature between them. A subject 3 is formed as an erecting real image 3' in the direction of the section X having the cruvature of the mirror 2 and in the combination of a recurrent reflection system and the lens 1. While a subject 4 is formed as a reverse real image 4' in the direction Y rectangular to the direction X. The aberration of the X and Y directions is compensated by the lens 5. This image forming device forms an erecting image in the direction X and a reverse image in the direction Y. Thus these plural small-sized optical systems are converted to an array in the direction X. As a result, a compact and long image forming device is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an imaging optical device, and particularly to a compact imaging optical device used in recording devices such as copying machines and facsimile machines.

Attempts have been made to make the imaging device more compact.
A triple-layered lens array, an in-prism lens array in which a lens array and a prism array are superimposed, and an in-dah mirror lens array in which a lens array and a roof mirror array are superimposed have been proposed. Among these, an imaging device with a short focal length, compact, and inexpensive is submitted to the same applicant as the present application.
'iFi/7Z Note 11ik Salek This is represented by the interior roof mirror lens array, but it is molded with plastic material, and the flat surface of the roof mirror surface that becomes the reflective surface is finished with a high aperture angle, so there are some technical difficulties. There is sex.

On the other hand, in U.S. Patent No. 11171870 specification-11, r'
An imaging device is disclosed that includes a 1ii mirror, a plano-convex lens, and a beam splitter that combines a right-angle mirror and a roof mirror. This is certainly compact and has the advantage that the image formed is a real image of 11'\'f in all directions on the image plane. However, the object f
Since the light from the object passes back and forth through llllt twice, there is a drawback that the light beam reaching the image plane is reduced to approximately ↓f. This type of beam splitter itself is expensive, and flare is likely to occur due to reflection from its back surface.

According to the present invention, cylindrical mirrors, lenses, and Mil
q[', H1 in the direction perpendicular to the cylindrical mirror
A cylindrical lens having a no. With this device, a real image of lj -1F is formed in the cross-sectional direction of the cylindrical mirror having curvature, and an inverted real image is formed in the cross-sectional direction of the cylindrical mirror without curvature. However, since the beam splitter used in this invention for dividing the optical path can be a normal right-angle mirror, it is inexpensive and wide, and for optical use] 11
There are also relatively few losses. By arranging each lintrical mirror, lens, and cylindrical lens in the direction in which a real image is formed, an even more compact and elongated imaging device can be obtained.

Therefore, an object of the present invention is to provide a compact and inexpensive imaging optical device with little loss of light quantity.

One aspect of the present invention is to provide a device in which an inexpensive right-angle mirror can be used as a heath splitter.

A further object of the present invention is to provide the above-mentioned device which can be extended in length.

These and other objects of the invention will become more apparent from the following description with reference to the drawings.

FIG. 1 shows the basic optical system of an imaging optical device according to the present invention. In this invention, 1: an optical system includes an optical mirror 2 disposed behind a lens 1;
, whose shape has a concave curved surface with a curvature R known in the conventional Dyson system in the X direction, and the combination of the retroreflective system and the lens 1 in the X direction with the object; 3 is formed as an erect real image 3'. The shape of the cylindrical mirror 2 is d with respect to the Y direction, which is at an angle to the X direction.
In this direction, the object 4 is imaged as an inverted real image 4' when the lens 1 is aligned. In this case, /lintritzlmirror2
A cylindrical lens 5 is arranged in front of the lens 1 in order to eliminate the unevenness of aberrations in the X and Y directions caused by the fact that the lens is not rotationally symmetrical about the optical axis. Cylindrical lens 5C: Disposed so as to have power in the direction orthogonal to the cylindrical mirror 2, that is, with the direction of curvature facing the Y direction and the direction of no curvature facing the X direction. The lens 1, the cylindrical litz mirror 2, and the cylindrical lens 5 (, -3) are arranged at intervals of ↑f so that the centers of the curved surfaces of υ substantially coincide with each other.

FIG. 2 shows an example of the specific positional relationship between the object point and image point and the optical path in such a basic optical system.
FIG. 2A is an optical path diagram in the X direction, and FIG. 2B is an optical path diagram in the X direction. As is clear from these figures, this actual Mji
In the example, intermediate images are formed on the cylinder l) Tunor mirror 2-J- in both the X and Y directions. In this optical system, the lens 1 and the cylindrical lip mirror can be integrally configured. :J1 is formed by forming a lens body 1' and then providing a reflective film on the lindrical surface 2' on the rear surface.

In this way, the imaging device Q-1 according to the present invention forms an erect real image in the A compact and elongated imaging device can be obtained by arranging a plurality of them in an array in the X direction. In Figure 4, such an arrayed image '! 4 is an example of a device, which includes a lens array 1, a cylindrical mirror array 2, and a cylindrical lens array 5" which integrally has a right-angle mirror 6 for splitting an optical path on the rear surface.Right-angle mirror for splitting an optical path 6 may be provided separately from the cylindrical lens array 5 shown in FIG.

Between each corresponding lens in the lens array 1 and the cylindrical mirror and the cylindrical mirror, there is a light-shielding plate to prevent stray light from the adjacent lens J.- and the cylindrical mirror. 7 is provided.

Each component in this imaging device is molded using a plastic material by injection molding, injection compression molding, compression molding, casting, etc., and is later assembled. 4. Plastic materials used include polymethinodomethacrylate resin, styrene resin, ABS resin, and AS resin. ilt, plastic resin and PPG product name C
There are thermosetting resins such as diethylene glycol hisallyl non-bonnet-1 polymer and epoxy resin, known as R-39. Reflective surface 6a
/l Lipid H. After 5, AI, 1, Ag, Cl-,
It is made by forming a thin film of Nj or the like by vacuum evaporation f7l)2, spackling method, ion blating method, etc.

FIG. 6 shows another optical system of the imaging device according to the invention. In this optical system, in the X direction shown in FIG. 6A, the imaging relationship according to the conventional Dyson system holds true as in each of the above embodiments. 1: In the Y direction shown in FIG. 6B, the light beam in the optical path between the lens 1'' and the cylindrical mirror 2 shall be a parallel light beam. This article f
In the Y-direction cross section shown in FIG.
The image object point 0'"coincideswith" the forward and vertical focal point position of the lens 1''. Like this (I1
By forming 1, in the X direction, each of the ten real Mj
+As in the example and In+, object point 0 is once cylindrical mirror 2
The image is formed on the cylindrical mirror 2'', but in the Y direction, it is visible on the cylindrical mirror 2''. However, as shown in FIG. 7, regarding imaging on the final image plane, as in each of the above embodiments, a real real image is formed in the X direction, and an f11 real image is formed in the Y direction.

In this optical system as well, the eighth
As shown in the figure, a reflective film can be formed on the 7-liner drill surface 2'' of the rear surface of the lens body 1'', so that both can be integrated.

In addition, as shown in FIG. 9, the lens 17" itself has a 5II
This optical system can be realized by giving it curvature in all directions. In other words, this lens 1'' has a curvature such that the focal length lli!lr2 in the Y direction is equal to the object distance l., and the focal length f1 divided by 7 in the X direction satisfies 1゛, 2f, = ]o. This lens 1"" has a second
It can be thought of as having the functions of both the lens in the optical system shown in the figure and the auxiliary IE lindrical lens 5. Therefore, this lens 1'' can also be applied to the optical system shown in FIG.

The optical system shown in FIG. 6 can also be arrayed in the X direction to form a long imaging device, similarly to the optical system shown in FIGS. 4 and 5.

The imaging device according to the present invention using these optical systems is
Both can be applied to input/output devices for line scanning or area scanning image information. For example, as shown in FIG. 10, an imaging device 9 according to the present invention having a configuration similar to that shown in FIG. The lamp 13 is disposed between the solid-state scanning reading element array 11 such as an amorphous I'-conductor array disposed above, and illuminates the original 12 that moves continuously or intermittently on the original table glass 10 with the lamp 13. If configured as follows, a reading device can be obtained. An image of one line of the original 12 is projected onto the solid-state scanning intensifier array 11 by the imaging device 9, and is transmitted as a time-series electrical signal to the solid-state scanning field and self-scanning of the pick-up element array. It is converted to months and output.

On the other hand, the recording device, for example, as shown in FIG.
The photoreceptor drum 15 moves at the same speed as the document 12 in the reading device located at the reading device 12. The solid-state light emitting element array 14 is sequentially input with electrical signals outputted by the reading device, and the emitted images thereof are sequentially projected onto the photoreceptor drum 15 by the imaging bag F+'-9. A photoconductive insulating layer is formed on the surface of the photoreceptor drum 15, and since this surface is electrically charged prior to the projection of the optical image, the electrical charge is selectively dissipated by the projection of the optical image. An electrostatic latent image corresponding to the original image is formed thereon in response to the light image, this is developed with colored particles called toner, and the developed image is transferred to transfer paper for recording.

Although this invention has been described above according to the specific embodiments shown in the drawings, this invention is not limited to the above-mentioned embodiments, and can be modified in various ways by applying known techniques and prior art. .

Simple IP and Explanation of the Drawings FIG. 1 is a diagram showing the basic optical system of the imaging device according to the present invention, FIG. 2A is an optical path diagram in the X direction in an embodiment of the present invention, and FIG. 2B is a diagram showing the basic optical system of the imaging device according to the present invention. , an optical path diagram in the Y direction in one embodiment of this invention M1j, FIG. 3A, 11-1 an optical path diagram in the X direction in another embodiment of this invention, FIG. 3B d1, a Y direction in another embodiment of this invention The optical path diagram, Figure 4A, is
Optical path diagram in the X direction in yet another embodiment of this invention,
FIG. 4B is an optical path diagram in the Y direction in yet another embodiment of the invention, FIG. 5 is an optical path diagram in the Y direction in yet another embodiment of the invention, and FIG. 6A is an optical path diagram in the Y direction in yet another embodiment of the invention. The optical path diagram in the X direction in this embodiment, FIG. 6B, is the optical path diagram in the Y direction in yet another embodiment of the present invention, FIG.
Figure A is an optical path diagram in the X direction in yet another embodiment of the invention, Figure 7B is an optical path diagram in the Y direction in yet another embodiment of the invention, and Figure 8A is an optical path diagram in the Y direction in yet another embodiment of the invention. The optical path diagram in the X direction in this embodiment, FIG. 811, is the optical path diagram in the Y direction in yet another embodiment of the present invention, FIG.
Figure A is an optical path diagram in the X direction in still another embodiment of the present invention, Figure 9B is an optical path diagram in the Y direction in yet another embodiment of the invention, and Figure 10 shows the result according to the present invention. Schematic diagram showing an example of a reading device using an image device, No. 11
The figure is a schematic diagram showing an example of a recording device using an imaging device according to the present invention.

Claims (1)

[Scope of Claims] 1. A cylindrical mirror and a lens arranged at a predetermined interval with substantially the center of each curved surface, and a cylindrical lens track having power in the direction perpendicular to the cylindrical mirror. An imaging optical device that is capable of forming an erect real image in the X direction of a cross section of the cylindrical mirror that has a curvature, and forms an inverted real image in the Y direction of a cross section that does not have the curvature. 2. On the cylindrical mirror,
2. The apparatus according to claim 1, wherein intermediate images are formed in both directions. 3. The device according to claim 1, wherein an intermediate image is formed in the X direction of the cylindrical mirror, and a virtual image is formed in the Y direction at the front focal position of the lens. 4. The device according to claim 1, wherein a plurality of the cylindrical mirrors, lenses, and cylindrical lenses are each arranged in the X direction to form an integral play. 5. The device according to claim 2 or 3, and claim 4, wherein the cylindrical mirror and the lens are integrally formed. 6. The device according to claim 2 or d: the device according to claim 3 or 4, wherein the lens has different curvatures in a direction with and without a curvature of the cylindrical mirror, respectively. . 7. The device according to claim 2 or 3, d, or 4, wherein a right-angle mirror for optical path splitting is arranged in front of the cylindrical lens. 8. The device according to claim 7, wherein the cylindrical lens and the right angle mirror are integrally formed.