JPS587665A - Optical device for copying machine - Google Patents

Abstract

PURPOSE:To provide a titled device which does not degrade the light emission efficiency of a light source, is compact and is light in weight by constructing a reflection shade of a light source for exposure in such a way that it can be divided vertically with the non-reflection surface part thereof as a center. CONSTITUTION:Part of a frame body 11 for the entire part of an illuminating device is constituted as a reflection shade 10, and the reflection surface 10A of the shade 10 is formed of elliptical curves. A light source lamp 3 for exposure is provided in the position where the light thereof can be reflected concentrically by the surface 10A. The shade 10 is so constituted that the surface 10A of elliptical curves on the inside surface is bisected equally and that the bisected parts are connected and fixed to one body by means of a connecting screw 13 in the non-reflection surface 10B part, whereby the exposure of an original 1 is made efficient by the 2nd reflection surface 14 of a flat surface. The 1st reflection mirror 4 is formed in the same body 11, and, for example, in the case of polishing the inside surface of the shade 10, the screw 13 is loosened and the shade 10 is divided vertically, whereby the easy job is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure light source device for a copying machine, etc., and particularly to an exposure light source device Kll for a copying machine that is compact and has an exposure device with excellent light source reflection efficiency. do.

Generally, in a copying machine, such as an electrophotographic copying machine, light from a light source is irradiated onto the surface of a document placed on a document table, and this reflected light is reflected by an optical system such as a reflective mirror and guided to the surface of a photoreceptor. , Kama is performed by forming a prototype on the surface of the photoreceptor.

Generally, there are two known methods for recording images as described above: one in which the document table is fixed and the optical system is moved, and the other in which the optical system is fixed and the document table is moved.

Figure 1 is a conceptual diagram of an exposure device with a moving optical system. In Figure 1, 1 is a document placed with the printed side facing down on a transparent F-lamin on the document table, and is illuminated by the illumination lamp 3. Then, the reflected light from the above-mentioned printing plate is reflected by reflection mirrors 4, 5.6 and 7.
The light is guided to the surface of the photoreceptor 9 through the. 8 is a lens for condensation. Next, the operation of the optical system configured as described above will be explained.

First, when the light source 3 is turned on, the first reflecting mirror 4, which is configured to move integrally with the light source 3, moves in the direction of the arrow parallel to the document at a speed U.

At the same time as this first reflecting mirror 4 moves, the second reflecting mirror 5
The third reflecting mirror 6 also follows and moves parallel to the document, but the speed at this time is Hυ in order to keep the optical path length constant. In this way, the entire surface of the document is optically scanned, and the reflected light from this image area is reflected from the photoreceptor 90am as described above.
However, at this time, the surface of the photoreceptor 90 also rotates at the same speed υ as the first reflecting mirror 4, so the reflected light is projected onto the surface of the photoreceptor 90 as if it were the original. Form accurate Kf*.

In the above moving optical system, both the second reflecting mirror 55 and the third reflecting mirror 6 move integrally at the speed of the first reflecting mirror 4, so the two reflecting mirrors are held at the same level. It is attached to a member and usually moves by being pulled by a wire or the like along a guide rail provided on the driving side of the holding member.

Copying machine 1 having the above-mentioned optical system 1 In accordance with the demand for compactness and weight reduction of the device with the spread of electrophotographic copying devices, for example, it is important to make the exposure device compact and lightweight as described above. It is becoming. Therefore, an object of the present invention is to reduce the luminous efficiency of the light source, and reduce the weight of the exposure light 11 of a copying machine etc. by using a light lamp.
The goal is to provide equipment.

As a result of various studies to address the above-mentioned problems, the present inventor has developed an optical device for a copying machine having an exposure optical system provided with an exposure light source and a plurality of reflective mirrors (1. It has been found that the above object can be achieved by an exposure device for a copying machine, which has a quadratic curve and can be divided into upper and lower parts around the non-reflective surface of the cough reflective umbrella.

That is, the present invention relates to a modified jLK of the exposure light source device in the optical system shown in FIG.

Hereinafter, the present invention will be specifically explained with reference to embodiments shown in the drawings.

FIG. 2 is a side view showing the main parts of the exposure light source device for a copying machine according to the present invention. In FIG. Reference numeral 11 denotes a frame of the entire illumination device, and a part of the frame is configured as a reflector 10, and the reflective surface 10A of the reflector 100 is formed in an elliptic curve. Reference numeral 3 denotes a light source lamp for exposure, which is disposed at a position where it can perform concentrated reflection from a reflecting surface 10AK formed in an elliptic curve. The reflective umbrella 10 has an elliptical-linear reflective surface on its inner surface, which divides the 10 people into equal parts, and separates the reflective umbrella 10 from the portion that becomes the non-reflective surface 10B when cast by the exposure light source lamp 3. ) C formed and the non-reflective surface 10
B sK is used to connect and fix the connecting screw 13 so as to be integrated. 14 is a frame body 110 formed into a circular surface and a reflective surface 1
This is a planar second reflecting surface that reflects the light reflected by the exposure light source lamp 30 at 0A and efficiently exposes the document 1 and the like. 4 is the first reflecting mirror shown in FIG. 1 and is formed within the same frame 11. Therefore, for example, when polishing the inner surface of the reflector 10, loosen the connecting screw 13 and then
Since the lower reflector 10 can be divided and processed, separate cloth polishing, which cannot be done through the narrow opening of the reflector 10, can be performed very easily.

Furthermore, after the polishing process, when the non-reflective surface portions 10B of the upper and lower reflectors 10 are overlapped and joined together with the connecting screws 13, the overall shape of the reflector is an ellipse with a narrow opening and a wide inside. Since the curved line allows the luminous flux to concentrate on one point, making it black and creating a mirror surface with extremely high reflectance, the lighting efficiency of the lighting tube 3 is high, and therefore it is possible to use low-intensity lighting lamps. I was able to do that. It goes without saying that the frame 11 may be made of metal such as aluminum or heat-resistant resin.

Further, since the reflection-10 according to the present invention has a shape that can hold the first 9-4 together with the frame 11, the reflection-10 can also integrally hold the first 9-4. It was also possible to make the lighting device compact and lightweight.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the optical system of a copying machine, and FIG. 2 is a side view of the main parts of the optical system of the copying machine according to the present invention. 3... Illumination lamp 4... First mirror 5... Second mirror 6... Falling 3 mirror 10... Reflection -11... ...Frame body 10B
...Non-reflective surface part 13 of reflective umbrella...Yoshimi Kuwabara, agent for connecting screws

Claims (1)

[Claims] 1. An optical device for a copying machine equipped with an exposure light source, characterized in that the exposure light source is configured to be split from a non-reflective surface portion of a reflector of the exposure light source.