JPH03220574A - Optical system driving device - Google Patents

Abstract

PURPOSE:To easily set the speed ratio of a light source lamp unit and a mirror base unit by providing a shaft which supports a 1st and a 2nd planetary gear and a shaft which supports an idle gear integrally with a light source lamp unit. CONSTITUTION:When the optical path length from an original platen 1 to a lens 10 is finely adjusted, screws 31 and 31 which clamp a movable rack gear 35 to a mirror base unit 7 are loosened. Then the movable rack gear 35 is moved in a direction A or B and when the movable rack gear 35 is moved in the direction A, the light source lamp unit 3 moves in the direction B, so that the optical path length from the original platen 1 to the lens 10 becomes short. When the movable rack gear 35 is moved in the direction B, the light source lamp unit 3 moves in the direction A and the optical path length from the original platen 1 to the lens 10 becomes long. Consequently, the moving speed is easily set and the optical path length from the original platen 1 to the lens 10 is finely adjusted with ease.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical system drive device used in an optical system, such as a copying machine, in which a light source lamp unit and a mirror base unit are driven at a predetermined speed ratio. It is related to.

[Conventional technology]

For example, in a copying machine with a fixed document table, as shown in FIG. 6 and FIG. system 53. The optical system 53 described above includes a lamp unit 55 having a light source lamp 54.
5 scans the original while irradiating it, and the reflected light is reflected by a mirror base unit 56 having a plurality of mirrors, a lens 57,
The light is guided to a photoreceptor (not shown) via a mirror holder 58 having a plurality of mirrors and a ξ cup 59. The mirror base unit 56 is configured to move at 1/2 the speed of the lamp unit 55 as the lamp unit 55 moves, and the mirror base unit 56 and the lamp unit 55 are connected to a wire 60. It is adapted to move as the wire 60 moves.

Further, the lens 57 in the optical system 53 is a fixed focus lens, and its zero-point adjustment is generally performed by adjusting the optical path length from the document table 51 to the lens 57 to a reference length, and then moving the optical path from the lens 57 to the photoreceptor. This is done by finely adjusting the imaging optical path length to the surface.

The above-mentioned adjustment of the imaging optical path length is performed by rotating the cam 61 and moving the mirror holder 58 back and forth in the direction facing the lens 57. That is, as shown in FIG. 8, the above cam 61 is attached to the mirror holder 58 and the main body member 62 by a cam shaft 61a, and by loosening the nut 63 that fixes the cam shaft 61a on the mirror holder 58 side. After that, drive the cam 6 from the main body member 62 side using the driver 64.
By rotating 1, the imaging optical path length is adjusted.

[Problem to be solved by the invention]

However, in the conventional structure described above, the configuration for setting the speed ratio between the lamp unit 55 and the mirror base unit 56 is complicated, and the attachment of the lamp unit 55 and the mirror base unit 56 to the 55 wire 60 requires position adjustment. is troublesome.

Further, since the position adjustment of the mirror holder 58, that is, the adjustment of the optical path length, is performed by rotating the cam 61 provided at the corner of the optical system 53, it is possible to adjust the position of the mirror holder 58 while observing the movement of the mirror holder 58. The problem is that it is difficult to make adjustments.

[Means to solve the problem]

In order to solve the above-mentioned problems, the optical system driving device of the present invention allows the light source lamp unit and the mirror base unit provided in the optical path between the light source lamp unit and the photosensitive material to be connected during operation of the optical system. In an optical system drive device that drives at a predetermined speed ratio, the following measures are taken.

That is, a fixed rack gear attached to the main body of the device, a movable rack gear attached to the mirror base unit, a first planetary gear that meshes with the fixed rack gear, and a gear ratio that is set to be different from that of the first planetary gear. a second planetary gear that is provided coaxially with the first planetary gear and rotates integrally with the first planetary gear; and an idle gear that meshes with the second planetary gear and the movable rack gear; A shaft that supports the gear and the second planetary gear and a shaft that supports the idle gear are integrally provided with the light source lamp unit.

[For production]

According to the above configuration, the speed ratio between the light source lamp unit and the mirror base unit can be easily set by, for example, setting the gear ratio between the first planetary gear and the second planetary gear. In addition, the optical path length can be adjusted by adjusting the position of the fixed rack gear attached to the device body, the position of the movable rack gear attached to the mirror base unit, the position of each gear attached to the light source lamp unit, or the position of the attached gear to the light source lamp unit. Attachment can be easily performed later by relatively rotating the first planetary gear and the second planetary gear and fixing them at a predetermined rotational position. Furthermore, the above operations can be easily performed while observing the movement state of each optical means.

[Example 1] An example of the present invention will be described below based on FIGS. 1 and 2.

As shown in Figure 2, a copying machine as an electrophotographic device has the following features:
An optical system 2 is provided below the document table 1 to scan the document placed on the document table 1 while irradiating it, and to guide the reflected light to the photosensitive drum 12 . This optical system 2 includes a light source lamp 4,
It includes a light source lamp unit 3 having a reflector 5 and a first mirror 6, a mirror base unit 7 having a second mirror 8 and a third mirror 9, a fixed focus lens 10, and a fourth ξ mirror 11. .

Further, the optical system 2 includes an optical system drive device 13 that drives the light source lamp unit 3 and the mirror base unit door when scanning the original on the original table l. The mirror base unit 7 is driven in the same direction as the light source lamp unit 3 at 1/2 the speed. As shown in FIG. 1, the optical system drive device 13 includes a fixed rack gear 14, a movable rack gear 15, a large-diameter planetary gear 16 that is a first planetary gear, and a small-diameter planetary gear 17 that is a second planetary gear.
, an idle gear 18 and a drive gear 19.

The above-mentioned fixed rack gear 14 is attached to a frame 25 on the main body side shown in FIG. It is provided. As shown in FIG. 1, the fixed rack gear 14 has screw holes 14a-14a formed at both ends, while elongated holes 25a are formed in the frame 25. Elongated holes 25a and 25 in the frame 25 through washers 21 and 21
By screwing the screws 20 through a,
A fixed rack gear 14 is attached to the frame 25. Therefore, the mounting position of the fixed rack prison 14 can be adjusted in the longitudinal direction through the elongated holes 25a and 25a'' of the frame 25.

The movable rack gear 15 is shorter than the fixed rack gear 16, is provided so as to be movable in the longitudinal direction, and is arranged parallel to the fixed rack gear 14 with its tooth surface facing upward. The movable rack gear 15 is connected to the mirror base unit 7 by screws (not shown) through threaded holes 15a formed at the ends of the movable rack gear 15.

The planetary gears 16 and 17 and the idle gear 18 are provided between the fixed rack gear 14 and the movable rack gear 15,
The planetary gears 16 and 17 are integral, the planetary gear 16 meshing with the fixed rack gear 14, and the idle gear 18 meshing with the planetary gear 17 and the movable rack gear 15. Also,
The planetary gears 16 and 17 are attached to a rotating shaft 23, and the idle gear 18 is attached to a rotating shaft 24. These rotating shafts 23 and 24 are attached to a support member (not shown) connected to the light source lamp unit 3. In this embodiment, the gear ratio between the planetary gear 16 and the planetary gear 17 is 2.
:1, the gear ratio between the planetary gear 17 and the idle gear 18 is l
: It is set to 1.

The drive gear 19 meshes with the movable rack gear 15 and is connected to a drive means (not shown).
5.

In the optical system 2 described above, the assembly is sometimes carried out using the lens 10.
First, the imaging optical path length from the document table 1 to the surface of the photoreceptor drum 12 is adjusted to a reference length, and then the optical path length from the document table 1 to the lens IO is finely adjusted.

In the above configuration, first, the principle of movement of the light source lamp unit 3 and mirror base unit 7 in the optical system driving device 13 will be explained.

The planetary gear 16 meshes with the fixed rack gear 14 and the fixed rack gear 14 is stopped, so when the planetary gear 16 rotates once in the C direction, the rotating shaft 23 of the planetary gear 16 moves in the A direction by the pitch circumference. Moving. If the planetary gear 16 is the module 1 and has 36 teeth, when the planetary gear 16 rotates once, the rotating shaft 23 will move by 36π in the direction A. Next, the planetary gear meshing with the idle gear 18. 17 similarly rotates once due to one rotation of the planetary gear 16, but since the gear ratio between the planetary gear 16 and the planetary gear 17 is 2:1, the number of teeth is 18, so the pitch circle movement is The distance will be 18π. Therefore, the idle gear 18 rotates in the D direction by this pitch circle movement distance of 18π, and transmits this to the movable rack gear 15. As a result, the movable rack gear 15 is connected to the planet gears 16 and 17 and the idle gear 1.
8 rotation shafts 23 and 24, that is, A of the light source lamp unit 3
The idle gear 18 moves in the A direction by 18π, which is the difference between the moving distance 36π in the direction and the moving distance 18π in the B direction of the idle gear 18 that is returned in the opposite direction. Therefore, with respect to the moving speed V of the light source lamp unit 3, the movable rack gear 15 moves in the same direction as the light source lamp unit 3 at a speed of ■×18π/36π, that is, v/2.

Next, the exposure operation in the optical system 2 will be explained.

When copying is performed, the light source lamp unit 3 scans the original placed on the original table l. At this time, the drive gear 19 rotates in the C direction, which causes the movable rack gear 15 to rotate.
moves in the A direction together with the mirror base unit 7. The movement of the movable rack gear 15 is transmitted to the light source lamp unit 3 connected to the rotating shafts 23 and 24 via the idle gear 18 and the planetary gears 16 and 17 according to the movement principle described above, and the light source lamp unit 3 is transferred to the mirror base unit 7.
move at twice the speed of

The light emitted from the light source lamp 4' of the light source lamp unit 3 is reflected by the original, passes through the first mirror 6, the second mirror 8, the third mirror 9, the lens 10, and the fourth mirror 11, and then reaches the photosensitive drum. 12, and an electrostatic latent image corresponding to the original image is formed on the surface of the photosensitive drum 12. Copying is then performed through a normal copying process.

Here, fine adjustment of the optical path length from the document table 1 to the lens 10 can be performed by the following operation.

First, the screws 20 fastening the fixed rack gear 14 to the frame 25 are loosened.

Next, the fixed rack gear 14 is moved in the A or B direction. For example, if the fixed rack gear 14 is moved by 2 in the direction B, considering that the movable rack gear 15 is fixed at this time, based on the above-mentioned principle of movement, the planetary gear 16 . 17 moves in the A direction by f/2. Therefore, the distance from the document table l to the lens 10 is shortened by one minute by moving the mirror base unit 7 by f/2 in the A direction.

On the other hand, when fixed rack gear 14 is moved in direction B, the distance from document table 1 to lens 10 increases by one minute.

As described above, according to the present optical system drive device 13, the moving speed of the light source lamp unit 3 and the mirror base unit 7 can be easily set by the gear ratio of the planetary gears 16 and 17 and the idle gear 18. , Also, the manuscript table l
Fine adjustment of the optical path length from to the lens 10, that is, focus adjustment, can be easily performed while the optical system 2 can be observed clearly by moving the fixed rack gear 14 attached by the elongated parts 25a and 25a.

[Embodiment 2] Another embodiment of the present invention will be described below based on FIGS. 2 and 3. For convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiments are given the same reference numerals, and their explanations will be omitted.

As shown in FIG. 3, an optical system driving device 3 according to this embodiment
3 has a movable rack gear 35 with two elongated holes 35a and 35a formed at the end thereof for mounting on the mirror base unit 7 side, and this movable rack gear 35 is attached to the mirror base unit 7 with screws 31 and 31. It has become something like this. Therefore, the mounting position of the movable rack gear 35 can be adjusted in the longitudinal direction. Further, the fixed rack gear 14 is attached to a frame on the main body side (not shown),
The tapped holes in this frame are circular holes, and the other configurations are the same as in the first embodiment.

In the above configuration, when finely adjusting the optical path length from the document table l to the lens 10, first, the movable rack gear 35
Screws 31 and 3 fastening the to the mirror base unit 7
1. Next, move the movable rack gear 35 to A.
Or move it in direction B. For example, movable rack gear 3
If the light source lamp unit 3 is moved by f/2 in the A direction, the light source lamp unit 3 will be moved by l in the B direction based on the movement principle described above.
The optical path length from the document table l to the lens IO is shortened by l. Similarly, if the movable rack gear 35 is moved in the B direction by 172, the light source lamp unit 3 is moved in the A direction by i, and the optical path length from the document table l to the lens 10 is increased by l.

As described above, according to the present optical system driving device 33, similarly to the configuration of the first embodiment, it is easy to set the moving speed, and
Fine adjustment of the optical path length from the document table 1 to the lens 10 is easy.

[Embodiment 3] Another embodiment of the present invention will be described below based on FIGS. 2, 4, and 5. For convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiments are given the same reference numerals, and their explanations will be omitted.

As shown in FIG. 4, an optical system driving device 4 according to this embodiment
3, the rotation shafts 23 of the planetary gears 16 and 17 and the rotation shaft 24 of the idle gear 18 are attached to a support plate 41, and this support plate 41 is attached to the light source lamp unit 3 with screws 42.

The screw holes of the support plate 41 through which the screws 42 are inserted are elongated holes 41a, and the mounting position of the support plate 41 to the light source lamp unit 3 can be adjusted in the longitudinal direction of the fixed rack gear 14. . The other configurations are similar to those of the previous embodiment.

In the above configuration, when finely adjusting the optical path length from the document table 1 to the lens 10, the screw 42 is first loosened, and the support plate 41 is
The light source lamp unit 3 is moved in the A or B direction. For example, if the light source lamp unit 3 is moved by l in six directions, the optical path length from the document table 1 to the lens 10 will be increased by l due to the movement of the light source lamp unit 3.

Conversely, if the light source lamp unit 3 is moved by l in the B direction, the optical path length from the document table 1 to the lens 10 will be shortened by l.

As described above, according to the present optical system driving device 33, similarly to the configuration of the first embodiment, it is easy to set the moving speed, and
Fine adjustment of the optical path length from the document table 1 to the lens 10 is easy.

Further, the planetary gear 16 and the planetary gear 17 are made separate, and after being assembled as an optical system drive device, the planetary gear 16 and the planetary gear 17 can be relatively rotated and fixed. Therefore, from the document table 1 to the lens 10
It is possible to finely adjust the optical path length up to At this time, the elongated hole 44a of the support plate 41 is unnecessary.

For example, as shown in FIG.
is provided, and an arc-shaped elongated hole 44a is formed in this disc 44,
On the other hand, the planetary gear 16 is formed with a screw hole corresponding to the elongated hole 44a. Then, the planet gears 16 and 17 are fixed by screws 45 passed through the long holes 44a of the disk 44 and the tapped holes of the planet gears 16. Note that the formation positions of the elongated hole 44a and the screw hole may be reversed.

In the above configuration, focus adjustment can be performed by using one of the planetary gears 16 and 17 as a reference and rotating the other. For example, the planet gear 16 is
Rotate it in direction C and fix it. As a result, since the fixed rack gear 14 is fixed, the planetary gears 16 and 17
The rotation shaft 23, that is, the light source lamp unit 3 moves, for example, l in the A direction. Furthermore, since the planetary gear 17 is in a fixed state, the idle gear 18 moves the movable rack gear 15 l in the A direction. As a result, the mirror base unit 7 moves the same distance and in the same direction with respect to the light source lamp unit 3, so the optical path length from the document table 1 to the lens 10 is l.
/2 shorter.

〔Effect of the invention〕

As described above, the optical system drive device of the present invention includes a fixed rack gear attached to the device main body, a movable rack gear attached to the mirror base unit, a first planetary gear that meshes with the fixed rack gear, and a first planetary gear that meshes with the fixed rack gear. A second planetary gear that is set to a different gear ratio than the first planetary gear, is provided coaxially with the first planetary gear, and rotates integrally with the first planetary gear, and is meshed with the second planetary gear and the movable rack gear. In this configuration, the shaft supporting the first planetary gear and the second planetary gear and the shaft supporting the idle gear are integrally provided with the light source lamp unit.

Thereby, the speed ratio between the light source lamp unit and the mirror base unit can be easily set with a simple configuration. Further, the adjustment of the optical path length, that is, the focus adjustment, can be easily performed while observing the movement state of each optical means.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is an exploded perspective view showing the optical system driving device. FIG. 2 is an overall configuration diagram showing the optical system. FIG. 3 is an exploded perspective view of an optical system driving device showing another embodiment of the present invention. FIGS. 4 and 5 show other embodiments of the present invention. FIG. 4 is an exploded perspective view showing the optical system drive device. FIG. 5 is a perspective view showing an example of the structure of a planetary gear. 6 to 8 show conventional examples. FIG. 6 is an overall configuration diagram showing the optical system. FIG. 7 is a plan view showing the optical system. FIG. 8 is a perspective view showing the vicinity of the cam shown in FIG. 7. l is a document table, 2 is an optical system, 3 is a light source lamp unit, 4
1 is a light source lamp, 7 is a mirror base unit, 10 is a lens, 12 is a photosensitive drum, 13, 33, and 43 are optical system drive devices, 14 is a fixed rack gear, 15 and 35 are movable rack gears, and 16 is a planetary gear (first 17 is a planetary gear (second planetary gear), 18 is an idle gear, 19 is a drive gear, 23 and 24 are rotating shafts, 25 is a frame, 25a
1 is a long hole, 1 is a support plate, and 44a is a long hole.

Claims (1)

[Claims] 1. Optical system drive that drives the light source lamp unit and the mirror base unit provided in the optical path between the light source lamp unit and the photosensitive material at a predetermined speed ratio when the optical system is operated. The device includes a fixed rack gear attached to the device main body, a movable rack gear attached to the mirror base unit, a first planetary gear meshing with the fixed rack gear, and the first planetary gear.
A second planetary gear that is set to a gear ratio different from that of the planetary gear, is provided coaxially with the first planetary gear, and rotates integrally with the first planetary gear.
A light source lamp unit includes a planetary gear and an idler gear that meshes with the second planetary gear and the movable rack gear, and a shaft that supports the first and second planetary gears and a shaft that supports the idler gear form a light source lamp unit. An optical system drive device characterized by being integrally provided.