JPH04115322U - Optical pickup lens cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the risk of the brush damaging the pickup lens. [Structure] The cleaning operation of the pickup lens 2 by the brush 1 is performed in a state where an upward driving force F is applied to the pickup lens 2 by energization of the focusing 7. The pickup lens 2 is cleaned at, for example, a neutral point position where the upward driving force F and the pressing force P from the brush 1 are balanced. The pickup lens 2 has a margin to escape from the overload from the brush 1, and there is no risk of damaging the lens.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea uses a brush to remove the optical pickup lens in an optical disc device. The present invention relates to a lens cleaning device that performs cleaning.

0002

[Conventional technology]

6 and 7 show a conventional optical pickup and lens cleaning device. Bu The disc 1 has a base part 1a that can be used to open the shutter of a disc cartridge, for example. It is attached to a slider (not shown) provided in the cartridge holder that performs the operation, and When the pickup lens is inserted, the slider moves with the pickup lens. Scrub and clean the surface of 2. In addition, in the figure, numeral 3 indicates the pickup. Lens holder with lens 2 attached, code 4 shows lens holder 3 as a focusing lens A leaf spring supported so as to be displaceable in the vertical direction (vertical direction), and reference numeral 5 indicates the base end of the leaf spring 4. A support stand to support, reference numeral 6 is the actuator base, and reference numeral 7 is both of the lens holder 3. The focusing coil for focusing drive attached to the side, code 8 is A magnetic circuit for focusing drive is provided along with a magnet facing a magnet (not shown). This is the yoke that makes up the road.

0003 In a conventional optical pickup, it is the optical pick that energizes the focusing coil 7. This is when the upload starts working, after the disk has finished loading. Therefore, when inserting a disc cartridge into an optical disc device, be sure to The focusing coil 7 is not energized and the leaf spring 4 hangs down as shown in the figure. The lens holder 3 is in a lowered state. In this state, the bottom surface of lens holder 3 and the The clearance t between the actuator base 6 is, for example, about 0.5 mm, which is very large. small.

0004

[Problem that the idea aims to solve]

In the above conventional lens cleaning device, the lens holder 3 is lowered and the actuator The cleaning operation is performed with a small clearance between the motor and the database 6. , when brush 1 pushes pickup lens 2 (brush 1 pushes pickup lens 2 ), the lower surface of the lens holder 5 will immediately touch the actuator base 6. Brush 1 hits the pickup lens and is restricted from moving downward. There was a risk of applying excessive force to the pickup lens 2 and damaging the pickup lens 2.

[0005] This invention was devised to eliminate the above-mentioned conventional drawbacks, and the brush is without applying excessive force to the pickup lens, which may damage the pickup lens. The purpose of the present invention is to provide a lens cleaning device that is free from leakage.

[0006]

[Means to solve the problem]

This invention solves the above problem by cleaning the pickup lens with a brush. In a lens cleaning device that performs cleaning, the brush is attached to the pickup lens. When making contact, the focusing coil of the lens actuator is energized and picked. It is characterized by being equipped with an overload prevention means for driving the up lens upward.

[0007]

[Effect]

In the above configuration, when the brush contacts the pickup lens, the focus The single coil is energized and an upward driving force is applied to the pickup lens. Therefore, the pickup lens absorbs the above-mentioned upward driving force and the pressing force from the brush. Cleaning is done with a brush at a position that balances the , so there is enough room to escape downwards against brush overload, and the brush There is no risk of damaging the pickup lens.

[0008]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Figure 3 is an optical disc FIG. 2 is a perspective view of the vicinity of an optical pickup and a cleaning device in the apparatus. In the figure In the optical pickup 11, the roller 12 is a guide shaft in the radial direction of the disk. It is possible to move in the radial direction of the disk (in the direction of arrow a) by rolling on the plate 13. code 1 4 is a cartridge holder (the one on the right side) on which a disc cartridge (not shown) is placed. (only part shown), rotate in the direction of arrow b around the center of rotation (not shown) on the right side of the figure. Equipped with a shutter lever 15 that moves, when inserting a disc cartridge, A slider 16 is provided for opening the shutter of the cartridge. cartridge When the holder 14 carries the disc cartridge and moves inside the optical disc device ( when moving in the direction of arrow a), the shutter lever 15 rotates in the direction of arrow b and Slide the slider 16 in the direction of arrow c, and slide the slider 16 onto the protrusion 16a attached to the slider 16. Open the shutter of the disc cartridge. Clean pickup lens 2 A brush 1 for cleaning is attached to the slider 16. Brush 1 itself The mounting location and mounting structure of brush 1 and brush 1 are similar to the conventional brush shown in Figures 6 and 7. Same as Rashi. In addition, in FIG. 3, the code 17 is a linear motor coil, and the code 17 is a linear motor coil. 18 and 19 are yokes, and 20 is a magnet, which are used to feed the optical pickup. Configuring the linear motor for driving

[0009] FIG. 1 is a perspective view of the lens actuator inside the optical pickup 11, and FIG. is the same side view. In the figure, reference numeral 3 indicates the lever to which the pickup lens 2 is attached. The lens holder, reference numeral 4, displaces the lens holder 3 in the focusing direction (vertical direction). A leaf spring that can be supported, reference numeral 5 is a support base that supports the base end of the leaf spring 4, and reference numeral 6 is a support stand that supports the base end of the leaf spring 4. The actuator base, reference numeral 7, is a lens attached to both sides of the lens holder 3. -Focusing coil for focusing drive, reference numeral 8 faces a magnet (not shown) It is a yoke that, together with the magnet, forms the focusing drive magnetic circuit. . The focusing coil 7 receives a magnetic field from a magnet (not shown), and when energized, generates an electromagnetic force in the focusing direction and moves the pickup lens 2 into the lens holder. Drives up and down together with 3.

0010 In the present invention, even before the brush 1 comes into contact with the pickup lens 2, The cassing coil 7 is energized to drive the pickup lens 2 upward. ing. At such timing, an upward electromagnetic force is generated in the focusing coil 7. energizing so as to cause overload to occur constitutes overload prevention means. focusing coil There are various possible timings for energizing the circuit 7. Flowchart in Figure 4 The example shown in the diagram is a case where a cleaning operation is performed at the time of loading. Also, the focusing control is activated immediately when the cartridge IN detection switch is turned on. The lens 7 is energized to raise the pickup lens 2. Also, figure In the embodiment shown in the flowchart of No. 5, the cleaning operation is performed at the time of unloading. In this case, the eject operation is started by turning on the eject switch. When the pickup lens 2 is It is something that makes you

[0011] Next, the operation will be explained. Cleaning movement during loading shown in Figure 4 In this case, the cartridge holder 14 on which the disk cartridge (not shown) is mounted is exposed to light. When pushed into the disk device, the disk cartridge 14 moves in the direction of arrow a. At the same time, the cartridge IN detection switch is turned on and the focusing command is turned on. The pickup lens 2 and and drive the lens holder 3 upward. The energizing voltage is, for example, about 4V, and it is It is preferable to make the voltage slightly larger than the voltage during focusing control. In this case, the lens holder 3 hits the upper cover 11a of the optical pickup 11, for example. child When the cartridge holder 14 moves inside the optical disc device in this state, the shutter - The lever 15 rotates in the direction of arrow b around the center of rotation (not shown) on the right side in Figure 3. The shutter lever 15 moves the slider 16 in the direction of arrow c, and At this time, the shutter of the disk cartridge is opened by the protrusion 16a. Slider 16 When the brush 1 moves in the direction of arrow c, the brush 1 moves together with the slider 16 and picks up the brush 1. The top surface of the top lens 2 is rubbed to perform a lens cleaning operation.

0012 In the lens cleaning operation, the pickup lens 2 is driven upward. Since it is receiving a force F, the combination of this upward driving force F and the pressing force P from the brush 1 Cleaning is performed by the brush 1 at a balanced position, for example, at a neutral point position. That is, as shown in FIG. 2, the lower surface of the lens holder 3 and the actuator base 6 There is sufficient clearance t between the Plenz 2 has plenty of room to escape. Therefore, the brush is applied to the pickup lens 2. There is no need to apply excessive force (1) and there is no risk of scratching the pickup lens (2). stomach. In the flowchart in Figure 4, the loading operation itself is the same as before. , After loading is completed, power to the focusing coil 7 is stopped and the pickup is stopped. The brush lens 2 is lowered to the state shown in Figures 6 and 7, but at this time the brush has already been removed. 1 is away from the pickup lens 2, so there is no problem.

[0013] In addition, the cleaning operation at the time of unloading shown in the flowchart of Fig. 5 To explain this, when you turn on the eject switch, the eject operation starts. At the same time, the focusing coil 7 is energized and the pickup lens 2 is Up. In this state, the cartridge holder 14 is positioned forward (in the direction of arrow a in FIG. 3). When moving the pickup lens 2 in the opposite direction), the brush 1 cleans the pickup lens 2. However, as shown in Figures 1 and 2, the pickup lens 2 is neutral. Since the pickup lens 2 is located near the point position, the pickup lens 2 is protected against overload from the brush 1. There is enough room to escape and there is no risk of overloading and damaging the lens. In addition, The eject operation itself is the same as before, and after the eject operation is completed, the The current supply to the cassing coil 7 is stopped, and the pickup lens 2 is lowered. child In this state, brush 1 is already far away from pickup lens 2, so there is no problem. .

[0014] In the embodiment, the brush 1 is attached to the slider 16, but However, the present invention is not limited to this, and other members that move together with the cartridge holder 14 may include a bracket. It may be a structure in which a brush is attached, or it may be unrelated to the cartridge holder 14. It is also possible to have a structure in which the brush is attached to a member that moves independently.

[0015]

[Effect of the idea]

According to the present invention, during the cleaning operation, the pickup lens is driven upward. For example, when the power and the pushing force from the brush are balanced, the brush is at the neutral point position. Cleans better, provides protection against brush overload, and prevents pimples. Do not apply excessive force to the pickup lens and avoid the risk of damaging the pickup lens. do not have.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a lens cleaning device of the present invention, and is a perspective view of a lens actuator portion of an optical pickup during a cleaning operation.

FIG. 2 is a schematic side view in FIG. 6;

FIG. 3 is a perspective view of the vicinity of an optical pickup and a cleaning device in the optical disc device.

FIG. 4 is a flowchart illustrating an example of the timing of a cleaning operation.

FIG. 5 is a flowchart showing another example of the timing of the cleaning operation.

FIG. 6 is a perspective view of a lens actuator portion of an optical pickup during a cleaning operation, explaining a conventional lens cleaning device.

FIG. 7 is a schematic side view of FIG. 6;

[Explanation of symbols]

1 brush 2 Pickup lens 3 Lens holder 4 Leaf spring 6 Actuator base 7 Focusing coil 11 Optical pickup 14 Cartridge holder 15 Shutter lever 16 Slider

Claims (1)

[Scope of utility model registration request] 1. A lens cleaning device that cleans a pickup lens with a brush, comprising overload prevention means that energizes a focusing coil of a lens actuator to drive the pickup lens upward when the brush comes into contact with the pickup lens. An optical pickup lens cleaning device characterized by: