JPS5860767A - Optical system driving device for copying machine - Google Patents

Abstract

PURPOSE:To obtain a high-quality copy picture, by fixing a mirror unit, which is held by a sliding part holding member and scans the rear face of a contact glass, to the sliding part holding member through a visco-elastic material. CONSTITUTION:An optical system driving device is provided with a sliding part holding member 10 for holding a sliding member 9 such as a bearing which slides a mirror unit 8 consisting of a halogen lamp 2, the first mirror 3, etc. along a guide shaft or the like. A wire 11 which scans and moves the sliding part holding member 10 left and right in accordance with a motor which is not shown in figure is engaged with this member 10. The mirror unit 8 is attached to the sliding part holding member 10 and is supported, and visco-elastic materials 12 are interposed between them. By this constitution, the variance of the speed of the first mirror 3 is reduced, and a high-quality copy piture is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical system drive device in a copying machine.

Generally, a copying machine has an optical system configured as shown in FIG. That is, an original placed on a contact glass (1) is irradiated with a Rogen lamp (2), and the reflected light is sent to the first mirror (3), the second mirror (4), the lens (5), and the third mirror. 452-(6) to the photoreceptor drum (7).
). Here, Heroge/Lamp (
2), the first mirror (3) and the second mirror (4) scan the lower surface of the contact glass (1) to the left.

Therefore, we integrated the Rogen lamp (2) and the first mirror (3) as a mirror unit, attached it to a sliding part holding member that holds sliding parts such as bearings, set it on a guide shaft, etc., and connected it to a motor. The image is scanned by a wire that is However, the speed fluctuation of the optical system,
In other words, jitter occurs in the copied image due to the large vibration. However, it has a large mass and requires a lot of driving energy.

The present invention has been made in view of the above points, and an object of the present invention is to provide an optical system drive device for a copying machine that has a simple configuration, can reduce vibration amplitude, and can obtain high-quality copied images. b An embodiment of the present invention will be described based on FIGS. 2 and 3. Components that are the same as those shown in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted. tzu... Rogenlang (2) and tuna 1
The mirror (3) is Z-knitted as a mirror unit (8). A sliding portion holding member αQ is provided that holds a sliding member (9) such as a bearing that slides along the guide shaft or the like.

A wire α force that scans and moves the sliding portion holding member αQ from side to side according to a motor (not shown) is engaged with this sliding portion holding member αQ.

The mirror unit (8) is attached to and supported by the sliding article holding member αIK, and a viscoelastic material (2) is interposed between the two.This viscoelastic material (2) is known as VEM under the Scotch Dump mark of Sumitomo 3M Limited, and exhibits an excellent damping effect.

In this configuration, when the mirror unit (8) was scanned and its velocity *111 on the $1 mirror (3) was measured, the characteristics shown by the solid line in Figure 3 were obtained. be. By the way, the dotted line shows the conventional characteristics, where the expansion and contraction of the driver α◇, the vibration of the motor, and the vibration of the sliding member (9) are transmitted to the first mirror (3) K with almost no attenuation, resulting in large speed fluctuations. .

Therefore, according to this embodiment, with a simple configuration that only includes the viscoelastic material (2), the speed fluctuation of the first mirror (3) can be suppressed to a small level, and a high-quality copy image can be obtained.

In the present invention, since the mirror unit and the sliding part holding member are fixed with a viscoelastic material interposed, the vibration of the optical system can be suppressed to a small level with a simple structure, and therefore, it is possible to obtain a high-quality copy image. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a general optical system, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is a characteristic diagram thereof. 1... Contact glass, 8... Mirror unit,
10... Sliding part holding member, 12... Viscoelastic material slanting
Requester Ricoh Co., Ltd.

Claims (1)

[Claims] 1. An optical system drive device for a copying machine, characterized in that a mirror unit held by a sliding part holding member and scanning a lower surface of a contact glass is fixed to the sliding part holding member via a viscoelastic material.