JPH07114121A - Optical scanner - Google Patents

Abstract

PURPOSE:To adjust the positional relation of plural movable reflection mirrors with simple constitution by allowing the movable reflection mirror driven at constant speed and the movable reflection mirror driven at half speed thereof to abut on each other, thereby positioning them. CONSTITUTION:Wires 29 and 30 for transmitting driving force to the movable reflection mirrors 6 and 7 are fixed on the reflection mirror 6 by fixing plates 31 and 32 through half-speed pulleys 27 and 28 provided at both ends of the mirror 7. When the wires 29 and 30 are driven, the mirrors 6 and 7 are moved on a pair of optical rails 33 and 34 in the speed ratio of 2:1. Abutting members 35 and 36 are provided on the pair of optical rails 33 and 34 so as to abut on the abutting surfaces 37 and 38 of the mirror 7. By allowing the abutting surfaces 39 to 42 of both mirrors 6 and 7 to abut, both mirrors 6 and 7 become in parallel with each other. Therefore, when the positional relation between the mirrors 6 and 7 is changed because of the looseness of the wires 29 and 30, it is easily adjusted to the specified positional relation by stretching and laying the wires 29 and 30 again in a state where both mirrors 6 and 7 are allowed to abut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device, and more particularly, to a first movable reflecting mirror which is driven at a constant speed and a second movable reflecting mirror which is driven at a speed half that of the first movable reflecting mirror. The present invention relates to a configuration that defines a relative positional relationship between mirrors.

[0002]

2. Description of the Related Art When a wire for transmitting a driving force to a first movable mirror and a second movable mirror is stretched, a predetermined positional relationship between the movable mirrors changes, which adversely affects an image. Therefore, as means for easily reproducing the predetermined positional relationship, the first movable reflecting mirror and the second movable reflecting mirror, which perform scanning movement while maintaining the predetermined positional relationship with each other, are provided at positions outside the respective scanning regions for copying. When the movable reflecting mirror is brought into contact with the movable reflecting mirror and the predetermined positional relationship between the first and second movable reflecting mirrors is distorted, the first and second movable reflecting mirrors are defined to have the predetermined positional relationship.
An optical scanning device in which a contact member such as
For example, it is disclosed in JP-A-61-77834.

[0003]

However, in the above-mentioned structure, the contact member for contacting the first movable reflecting mirror is provided outside the second movable reflecting mirror so as not to interfere with the second movable reflecting mirror. The first movable reflecting mirror has to be larger than the second movable reflecting mirror in order to bring the first movable reflecting mirror into contact with the contact member. In view of the above problems, the present invention provides an optical scanning device that can easily adjust the positional relationship between the first movable reflecting mirror and the second movable reflecting mirror with a simple configuration.

[0004]

In order to achieve this object, an optical scanning device according to the present invention comprises a first movable reflecting mirror which is driven at a constant speed, and a speed which is 1/2 of that of the first movable reflecting mirror. A second movable reflecting mirror that is driven by the above-mentioned, and each movable reflecting mirror comes into contact with each other at the same time as being brought into contact with the second movable reflecting mirror, and by positioning the second movable reflecting mirror. This is provided with a configuration in which an abutting member that defines the relative positional relationship of the movable reflecting mirror is provided.

[0005]

According to the present invention, since the first movable reflecting mirror abuts on the second movable reflecting mirror, the parallelism between the two is adjusted, and the second movable reflecting mirror abuts on the abutting member. By doing so, the relative positional relationship such as the optical path length of each movable reflecting mirror can be easily adjusted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical scanning device of the present invention will be described below with reference to the drawings. FIG. 1 shows a copying machine having a configuration according to the present invention, which includes an exposure optical system 1, an image forming mechanism 2 for forming an image by exposure by the exposure optical system 1, and a sheet feeding to the image forming mechanism 2. The paper feeding mechanism 3 is provided.
The exposure optical system 1, the image forming mechanism 2, and the paper feeding mechanism 3 may be integrally configured or may be separately configured. In particular, a plurality of sheet feeding units 3a separate from the sheet feeding mechanism 3 are stacked for each sheet size.

The exposure optical system 1 moves under the platen glass 4 to scan an original and moves at a speed ratio of 1/2 with respect to the lamp 5 and the first movable reflecting mirror 6 and the first movable reflecting mirror 6. It includes a second movable reflecting mirror 7, a lens 8 that moves to keep the optical path length constant, a third reflecting mirror 9, and a fourth movable reflecting mirror 10.

The image forming mechanism 2 includes a photosensitive drum 11, a charging means 12 arranged around the photosensitive drum 11, a side erase 13,
A developing unit 14, a transfer unit 15, a cleaning unit 16 and the like are provided, and a toner image corresponding to an original image for exposure is formed on the photosensitive drum 11 by a general electrophotographic method.
Transfer to the paper that is fed. In front of the transfer section where the photoconductor drum and the transfer means face each other, the front end of the paper 19 fed one by one is stopped by the paper feed roller 17 and the sub-roller 18 of the paper feed mechanism. Of a pair of registration rollers 20 for adjusting the feeding timing and adjusting the feeding timing.
Is provided. Further, behind the transfer portion, there are provided a fixing device 21 for fixing the transferred paper 19 and a pair of discharge rollers 22 for discharging the paper sent from the fixing device 21.

Further, these paper transport systems have a unit structure that can be opened and closed with the paper transport system as a boundary so that jam processing can be performed easily.

The paper feed mechanism 3 is provided with paper 19 of different sizes.
And a paper feeding unit including a paper path 24. The sheet feeding units are stacked for each sheet size to enable sheet feeding corresponding to each size.

Reference numeral 25 is a manual tray, and 26 is a paper discharge tray. Next, the optical scanning device of the present invention will be described in detail. In FIG. 2, 6 is a first movable reflecting mirror, 7 is a second movable reflecting mirror, and half speed pulleys 27, 28 are provided at both ends thereof.
Is provided. The wires 29 and 30 for transmitting the driving force to the respective movable reflecting mirrors are passed through the half-speed pulleys 27 and 28 and then fixed to the first movable reflecting mirror 6 by the fixing plates 31 and 32. , 30 are driven, the first movable reflecting mirror 6 and the second movable reflecting mirror 7 can move on the pair of optical rails 33, 34 at a speed ratio of 2: 1. Abutting members 35, 36 on the pair of optical rails are capable of abutting on the abutting surfaces 37, 38 of the second movable reflecting mirror 7 at positions outside the copying scanning area of the second movable reflecting mirror 7. It is provided. In addition, the contact surfaces 39 and 40 of the first movable reflecting mirror 6 and the second
By bringing the contact surfaces 41 and 42 of the movable reflecting mirror 7 into contact with each other, the movable reflecting mirrors are made parallel to each other.

Therefore, the first movable reflecting mirror 6 and the second movable reflecting mirror 7 are caused by the reason that the wire of the optical scanning device is extended.
When the predetermined positional relationship of No. 1 is changed, the first movable reflecting mirror 6 and the second movable reflecting mirror 7 are brought into contact with each other, and at the same time, the second movable reflecting mirror 7 is brought into contact with the abutting members 35 and 36, and the wire is again attached. If the movable reflecting mirrors are stretched again, the movable reflecting mirrors can be adjusted to have a predetermined positional relationship such that the parallelism between them and the optical path length from the document surface to the image forming surface are correctly obtained.

In this embodiment, the contact member for contacting the second movable reflecting mirror is provided, but there is no problem with the structure in which the contact member contacts the first movable reflecting mirror. Further, the movable reflecting mirror may be brought into contact with the frame or the like forming the optical scanning device to position the movable reflecting mirror without providing a new contact member.

[0014]

As described above, according to the present invention, the first movable reflecting mirror and the second movable reflecting mirror are brought into contact with each other and the second movable reflecting mirror is brought into contact with the abutting member without increasing the size of the movable reflecting mirror. If the wire is stretched again in this state, the predetermined positional relationship can be easily reproduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a copying machine having an optical scanning device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an optical scanning device according to a first embodiment of the present invention.

[Explanation of symbols]

 6 First movable reflecting mirror 7 Second movable reflecting mirror 35, 36 Contact member

Claims (2)

[Claims] 1. A first movable reflecting mirror that is driven at a constant speed, and a second movable reflecting mirror that is driven at a speed half that of the first movable reflecting mirror, each movable reflecting mirror. An optical scanning device characterized in that the two are brought into contact with each other for positioning. 2. A first movable reflecting mirror which is driven at a constant speed and a second movable reflecting mirror which is driven at a speed half that of the first movable reflecting mirror, each movable reflecting mirror. And an abutting member that abuts on one movable reflecting mirror at the same time to bring them into contact with each other and positions the movable reflecting mirror so that the relative positional relationship between the movable reflecting mirrors is defined. .