JPS5926353Y2 - Optical system moving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical system moving device for moving an optical system of a copying machine exposure device or the like during exposure scanning.

Conventionally, as an exposure device for a copying machine, an optical system including first and second mirrors, an imaging lens, and a light source is provided with respect to the document table so as to be movable back and forth, and the document fixed on the document table is exposed. A known type is one in which scanning is performed using a first mirror, and the reflected light is projected onto the surface of a photoreceptor through a second mirror and an imaging lens.

Although the above-mentioned exposure apparatus is small, it has the advantage that the entire copying machine can be designed compactly, and the exposure apparatus is currently known as an exposure apparatus for a general copying machine.

However, in the optical system with the above configuration, the second mirror is moved at half the scanning speed (moving speed) of the first mirror facing the original.
Since the optical path length is always kept constant by moving the mirror, the scanning speed of the first and second mirrors will be twice as fast, but the moving device will be somewhat complex and large. It has the following defects.

The present invention was devised in view of the above circumstances, and its purpose is to provide an optical system moving device that can move the second mirror at a speed equal to that of the first mirror, and that can have a simple and compact structure. The goal is to provide the following.

Embodiments of the present invention will be described below with reference to the drawings.

A pair of substrates 3, 3 are arranged in parallel along the scanning direction below the document table 2 fixed to the copying machine main body 1, and a second traveling body 4 is mounted on a bearing on each substrate 3. A first running body 6 is provided on the winter coat 2 running body 4 so as to be movable in the scanning direction via a bearing ball 7.

A first mirror 8 and a light source 9 are horizontally fixed across the space between the winter wool 1 running bodies 6, facing the document mounting table 2, and each of the second
A second mirror 10 is horizontally fixed and straddled between the traveling bodies 4.

As described above, if the second traveling body 4 and the first traveling body 6 are moved at the same speed, the first traveling body 4 moves by 1 while the second traveling body 4 moves by 1 as shown in FIG. 6 will move by L.

Therefore, the second mirror 1 is moved at a speed equal to the moving speed of the first mirror 8.
0 can be moved, and the first and second traveling bodies 6.4 can be moved at the same speed, resulting in a simple and compact configuration.

Next, the drive system of the first and second traveling bodies 6, 4 will be explained with reference to FIG.

The first and second running bodies 6 and 4 are biased and maintained at their original positions by springs 11 and 12, and a movable pulley 13 is provided on the second running body 4, and a rope 14 wound around the movable pulley 13 is driven. Pulley 1
At the same time, a rope 17 is wound around a small diameter pulley 16 provided coaxially with the movable pulley 13, and the rope 17 is connected to the first traveling body 6.

Here, when the drive pulley 15 is driven with the diameter of the movable pulley 13 as D, the diameter of the drive pulley 15 as D, and the diameter of the small diameter pulley 16 as p, the circumferential speed of the drive pulley 15 is assumed to be paddy, the movable pulley 13
moves together with the second moving body 4 at a speed t of WD, and the first moving body 6 moves at a speed p with respect to the second moving body 4.

Therefore, the first mirror 8 moves with respect to the substrate 3 at a speed xD, and the second mirror 10 moves with respect to the substrate 3 at a speed xD.

'j Since the present invention is constructed as described above, by rotationally driving the drive pulley 15, the second running body 4 and the first running body 6 are moved in the same direction, and the first running body 6 is moved in the same direction as the second running body 6. 4, and the second mirror 10 can be moved at a speed equal to the speed of the first mirror 8.

In addition, the second traveling body 4 is provided with the first traveling body 6 so as to be movable in the same direction, and the second traveling body 4 is provided with a movable pulley 13 having a small diameter pulley 16 on the same axis, and is wound around the small diameter pulley 16. The rope 17 is simply connected to the first running body 6, and the rope 14 wound around the movable pulley 13 is wound around the drive pulley 15, making the structure simple and compact.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall front view, FIG. 2 is a plan view, and FIG.
A sectional view taken along the line III, FIG. 4 is a schematic diagram illustrating its operation, and FIG. 5 is an explanatory diagram of its drive system. 4 is a second running body, 6 is a first running body, 8 is a first mirror, and 10 is a second mirror.

Claims (1)

[Scope of utility model registration request] A first traveling body 6 is provided on the second traveling body 4 that moves along the document table 2 so as to be movable in the same direction as the second traveling body 4. A mirror 8 is provided, and the second traveling body 4 is provided with a second mirror 10 that receives the reflected light from the first mirror 8. The second traveling body 4 is provided with a small diameter pulley 16, and the small diameter boo A movable pulley 13 is provided coaxially and integrally with the movable pulley 13, and the rope 14 wound around the movable pulley 13 is wound around the drive pulley 15, and the rope 17 wound around the small diameter pulley 16 is connected to the first traveling body 6. An optical system moving device characterized in that the diameter of the movable pulley 13 is twice the diameter of the small diameter pulley 16.