JPH04109749U - Lens support device for electrophotographic equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the tilting movement of the lens frame that occurs when the lens frame starts and stops driving, and to suppress the vibration noise caused by the collision between the lens frame and the support provided on the base. Provided is a lens support device for an electrophotographic device that can perform the following functions. [Structure] A magnet holding portion 15a of a lens frame 15 is formed, and a magnet 9 is fixed to the magnet holding portion 15a. base 1
Since the lens frame 8 is made of a magnetic sheet metal, the lens frame 15 is attracted to the base 18 by the magnetic force of the magnet 9 . Therefore, when the lens frame 15 starts driving and stops driving, the tilting movement of the lens frame 15 is suppressed, and the collision of the lens frame 15 with the rail 6 is alleviated.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a lens support device installed in the optical system of electrophotographic devices such as copying machines. do.

0002

[Conventional technology]

3 and 4 show a lens support device 20 according to a conventional example. This lens support device Reference numeral 20 constitutes an exposure device of the copying machine. In the figure, reference numeral 7 indicates a lens, and this lens 7 is held in the lens frame 5. held. As shown in detail in FIG. 5, the lower surface of the lens frame 5 has a recess 5a. is formed. Four protrusions 5b are formed at both ends within this recess 5a. The protrusions 5b are arranged opposite to each other.

0003 Reference numeral 8 indicates a base on which the lens frame 5 is provided, and this base 8 includes a support. A rail 6 is provided as a holding part. The concave portion 5a of the lens frame 5 is The lens frame 5 is fitted to the rail 6 with a slight gap. It is supported cantilevered by the rail 6 and can slide in the direction in which the rail 6 extends. It has become.

0004 Reference numeral 4 indicates a wire, and both ends of this wire 4 are attached to the lens frame 5. It is being The wire 4 is stretched between a pair of pulleys 3a and 3b. Pulley 3 b is attached to the tip of the shaft 3c, and a gear is attached to the base end of the shaft 3c. 2a is attached. The code 1 indicates a motor, and the rotating shaft of this motor has a gear. A gear 2b is attached, and this gear 2b meshes with the gear 2a.

[0005] In this lens support device, the power of the motor 1 moves the gears 2b, 2a, and the shaft 3c. The signal is transmitted to the pulley 3b through the wire, and the pulley 3b rotates to drive the wire 4 and Move the lens frame 5 in the direction of arrow A or and drive in the direction shown by arrow B.

[0006]

[Problem that the idea aims to solve]

When starting to move the lens frame 5, the lens frame 5 is pulled by the wire 4. Since the lens frame 5 is stretched, the lens frame 5 assumes an oblique posture as shown in FIG. Therefore, the convex portion 5b collides with the rail 6, and the member provided in the lens frame 5 The moving parts of the machine vibrate, producing vibration noise. Also, when stopping the lens frame 5, due to the inertia of the lens frame 5, As shown in FIG. 7, the lens frame 5 assumes an obliquely inclined posture. For this lens Vibration noise is generated in the same manner as when the frame 5 starts to be driven.

[0007] In particular, recently, in order to reduce costs, the lens frame 5 has been made lighter and rails have been made lighter. 6 has been simplified, making it easier to generate vibration noise. The lens frame 5 is made heavier to increase the frictional force between the lens frame 5 and the base 8. By reducing the inertia of the lens frame, the weight of the lens frame can be reduced. This goes against the trend and increases costs.

[0008] In addition, since the lens 7 must be positioned accurately, the lens frame 5 must be It is necessary to control the stopping position with high precision. Therefore, the backlash of gears 2a and 2b Position control is performed taking into account the In other words, the meshing between gear 2a and gear 2b Taking into account the looseness, the lens frame 5 is made with high precision by repeating forward and reverse rotation of the motor 1 several times. I'm trying to position it. Therefore, when the lens frame 5 starts driving and stops driving, The system repeatedly stops, producing an unpleasant vibration sound each time. The present invention was developed by focusing on the above-mentioned problems with the conventional lens frame. A lens for electrophotographic equipment that can prevent vibration noise when starting and stopping the drive. The purpose of this invention is to provide a support device for the camera.

[0009]

[Means to solve the problem]

The invention according to claim 1 includes a lens frame that holds a lens, and the lens frame. a base provided with a lens frame; and a base provided on the base to allow the lens frame to slide freely. An electronic photographic camera having a support section for supporting the lens frame, and a sliding means for sliding the lens frame. In the lens support device of the true device, the lens frame is attracted to the base. A lens for an electrophotographic device, characterized in that the lens frame is provided with a magnet that It is a support device.

0010 The invention according to claim 2 provides a lens frame for holding a lens, and the lens frame. a base provided with a lens frame; and a base provided on the base to allow the lens frame to slide freely. It has a support part that supports the lens frame in a cantilever manner, and a sliding means that slides the lens frame. In a lens support device for an electrophotographic device, the lens frame is sucked into the base. It is characterized in that the magnet to be attached is provided in a part other than the part facing the support part. This is a lens support device for an electrophotographic device.

[0011]

[Effect]

In this invention, the lens frame is attracted to the base by the magnet, so the lens frame is attracted to the base. The tilting movement of the lens frame is suppressed when the lens frame starts and stops driving. You will be able to receive Therefore, the collision between the lens frame and the support part is alleviated, This will suppress the generation of unpleasant vibration sounds. Furthermore, in the invention of claim 2, the magnet is arranged in the part of the lens frame where the load is applied. Therefore, vibration of the lens frame can be effectively suppressed.

0012

【Example】

Embodiments of the present invention will be described below with reference to the drawings. The lens support device 60 according to the embodiment is the same as the lens support device according to the conventional example. Since the configuration is almost the same, only the differences from the conventional example will be explained in this example. , and parts with the same configuration are given the same reference numerals as in the conventional example, and explanations are omitted. do.

[0013] Reference numeral 15 indicates a lens frame, and this lens frame 15 is made of plastic. Therefore, it is configured. On the opposite side of the lens frame 15 from the attachment part to the wire 4 A magnet holding portion 15a is formed at the end. The magnet 9 is attached to this magnet holding portion 15a. Fixed. Reference numeral 18 indicates a base, which is made of a magnetic sheet metal. therefore The lens frame 15 is attracted to the base 18 by the magnetic force of the magnet 9. The sliding means includes pulleys 3a, 3b, shaft 3c, wire 4, gears 2a, 2b, and and a motor 1.

[0014] In this lens support device 60, the lens frame 15 is attached to the base 1 by the magnet 9. 8, so when the lens frame 15 starts driving and stops driving, , the tilting movement of the lens frame 15 is suppressed, and the collision of the convex portion 5b with the rail 6 is prevented. will be eased. Therefore, the vibration of the movable part of the lens frame 15 is weak. This will prevent unpleasant vibration noise from occurring. In the above embodiment, a copying machine is shown as an electrophotographic device, but the present invention is limited to copying machines. First, it can also be applied to lens support devices such as printers.

[0015]

[Effect of the idea]

As described above, the present invention uses a magnet that attracts the lens frame to the base. Now that the lens frame is attached to the base, the magnet will attract the lens frame to the base. The lens frame changes when the lens frame starts and stops driving. This means that the tilting movement of the system can be suppressed. Therefore, the relationship between the lens frame and the support part is Collisions are alleviated and unpleasant vibration noises are suppressed.

[0016] Furthermore, in the invention of claim 2, the magnet is arranged in the part of the lens frame where the load is applied. Therefore, vibration of the lens frame can be effectively suppressed. Also, unlike the method of making the lens frame heavier to suppress the lens frame inertia, It is also possible to keep costs low.

[Brief explanation of drawings]

FIG. 1 is a plan view of a lens support device for a copying machine according to an embodiment of the present invention.

FIG. 2 is a front view of a lens support device of a copying machine according to an embodiment of the present invention.

FIG. 3 is a plan view of a lens support device for a copying machine according to a conventional example.

FIG. 4 is a front view of a lens support device of a conventional copying machine.

FIG. 5 is a diagram for explaining conventional problems.

FIG. 6 is a diagram for explaining conventional problems.

FIG. 7 is a diagram for explaining conventional problems.

[Explanation of symbols]

1 motor 2a gear 2b gear 3a Pulley 3b Pulley 4 wire 9 magnet 15 Lens frame 15a Magnet holding part 18 base 60 Lens support device

Claims (2)

[Scope of utility model registration request] 1. A lens frame for holding a lens, a base on which the lens frame is provided, a support portion provided on the base for slidably supporting the lens frame, and a sliding member for sliding the lens frame. 1. A lens support device for an electrophotographic device, characterized in that the lens frame includes a magnet for attracting the lens frame to the base. 2. A lens frame that holds a lens, a base on which the lens frame is provided, a support portion that is provided on the base and slidably supports the lens frame in a cantilevered manner, and the lens frame is slidable. A lens support device for an electrophotographic apparatus having a sliding means, characterized in that a magnet for attracting the lens frame to the base is provided in a part other than the part facing the support part. Support device.