JPH0536616U - Optical head cleaning member - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to improve the cleaning effect of an optical head having a plurality of lenses. [Structure] A plurality of types of lens surface cleaning bodies having different projection lengths from the board surface are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cleaning member for cleaning a lens of an optical head unit of a recording / reproducing machine for a compact disk (CD), a laser disk (LD), an electronic file, or the like.

[0002]

[Prior Art]

 Optical discs and magneto-optical discs are used to record sound information, image information, computer data and programs, which are set on a reproducing device or reproducing / recording device, rotated, and irradiated. It is designed to receive reflected light. Since the surface of the lens of this optical head is exposed to the internal space of the disk device, dust is likely to adhere to it, which is likely to adversely affect the recording or reproduction of information.

Therefore, for ease of cleaning operation, a cleaning member in which a cleaning body such as a brush is projected by flocking or the like is used on the surface of a disk body having the same shape as the disk board.

It is preferable that the amount of protrusion of the cleaning member be such that the surface of the lens of the optical head unit is wiped. If it is too short, the cleaning capacity will be low, which is not desirable. Therefore, the protruding amount of the cleaning body is configured to have a constant length.

[0005]

[Problems to be solved by the device]

 However, in recent years, compatible types of optical disc reproducing devices, such as CDs and LDs, which can reproduce any type of optical disc having different information contents and sizes, have begun to spread.

However, since the LD optical head unit has a larger disk size and a higher rotation speed than a CD, the tilt of the entire head unit is corrected in addition to the head lens for picking up sound and image information. However, the head lens is equipped with multiple types of lenses such as a lens that detects the tilt of the board so that it always faces the direction perpendicular to the board. The heights of both lenses do not interfere with each other, and the lens for the tilt sensor is located farther from the board surface than the head, because of the assembly process. A cleaning unit for a CD player having only one cleaning member, for example, a lens, cannot clean the tilt sensor lens sufficiently even though it is a compatible type.

Therefore, if the protrusion amount of the cleaning member is made long enough to fit the cleaning of the tilt sensor lens, the pickup head lens becomes overloaded and unsuitable for use.

[0008]

[Means for Solving the Problems]

 The present invention has been made in view of such circumstances, and is provided with a plurality of types of cleaning bodies having different protruding lengths from the board surface.

[0009]

[Action]

 According to the above configuration, the cleaning body having a short projection length contacts the lens for the pickup head, and the cleaning body having a long projection length contacts the lens for the tilt sensor, and each cleans the dirt. In other words, it is possible to clean both lenses at once without giving an excessive load to the optical head unit, which is easy to use.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the cleaning member, and this board 1 has substantially the same shape as an LD having a constant linear velocity (CLV). The board 10 is provided with a label A, a lead-in track B 1, a play track C, and a lead-out track D in this order from the inner peripheral side. On the lead-in track B, a signal for listing the contents of the board 1 is recorded on the side of the disk device (not shown). When the board 1 is set in the disk device, the optical head 2 in the device will have the lead-in track B Start reading from. A case where an LD player is used as the disc device will be described. Further, sound and image information are recorded in the play track C.

The lead-in track B of the board 1 is provided with a first brush body 3 having a protrusion amount from the board surface of 4.5 to 6.5 mm, preferably 5.5 mm, as shown in FIG. Four trees are planted evenly. The first brush body 3 is formed by bundling brush fibers made of nylon fiber having a wire diameter of about 40 to 70 μm in a length of about 1 mm so that the width of the lead-in track B is smaller than 1.5 mm.

A second brush body 4 having a protrusion amount of 3 to 4 mm, preferably 3.5 mm, is planted in the play track C equally divided into 90 °, but the position is between the first brush bodies 3. It is offset by 45 ° so that it is located at. Since the LD rotates at a high speed of 600 to 1800 rpm in the CLV mode, it is convenient to correct the rotational imbalance by providing a cleaning body, and the rotation is stable without breathing. Will be done. Moreover, the second brush body 4 is designed so that the lens surface for the pickup head can be uniformly cleaned, so that the diameter of the second brush body 4 slightly exceeds the range of the lens diameter (for example, 6 mm) in the radial direction. The position is shifted. The second brush body 4 is also made of the same synthetic resin fiber as that of the first brush body 3, for example, a crystalline resin such as polyacetal or vinyl chloride, but in addition to this, it is made of animal such as pig hair or boar. Fibers can also be used.

FIG. 3 shows a state in which the optical head unit 5 is cleaned by using such a cleaning member, 6 is a lens for the tilt sensor, 7 is a lens for the pickup head, and 6 is the lens for the tilt sensor. From the lens 7 for head, about 1. They are arranged about 5 mm below and side by side in the track direction.

First, when this board 1 is set in a disk device and this device is activated, the first cleaning body 3 cleans the surfaces of both lenses 6 and 7. At this point, the first cleaning body 3 having a large protrusion amount with respect to the head lens 7 abuts more than necessary, but since the first cleaning body 3 is provided in the region of the lead-in track B, the distance from the rotation center is large. Therefore, the rotation is smooth and the rotation is smooth, and the first cleaning body 3 is excessively deformed to change the laser light amount, which causes an error in the pickup of the head lens 7. However, since this area is the lead-in track B, the rotation does not stop immediately. For this purpose, it is preferable that the first cleaning body 3 is planted in the lead-in track B near the play track C, avoiding the first part of the lead-in track B so that normal reading can be performed. From the center side, the work credit, the test signal (color bar), the black burst, and the lead-in logo are recorded in this lead-in track in this order. By placing the planting position toward the second half of the track, the test signal and black are recorded. It only needs to partially destroy the data in the burst. If the first cleaning body 3 has a large bristle tuft, the tip of the tuft may be scattered by repeatedly recording, for example, a table of contents (TOC) signal with the area of the lead-in track B facing outward in the radial direction. Even if a deformed habit occurs, it can be dealt with by expanding it so that a normal TOC signal can be read.

Next, when the optical head unit 5 moves radially outward, the second cleaning body 4 implanted in the play track C and having a small protrusion amount cleans the surface of the head lens 7. Since the positions of the respective second cleaning bodies 4 are displaced outward in the radial direction, overload is not applied because the entire surface of the lens 7 is divided and cleaned without being cleaned at once. The cleaning contact force is applied to both the lenses 6 and 7 at the same time by separating the implantation distance between the first cleaning body 3 and the second cleaning body 4 from the arrangement distance between the sensor lens 6 and the head lens 7. It is desirable to prevent

[0016]

[Other Examples]

 To enhance the cleaning effect, it is preferable to moisten the lens surface and then clean it with a cleaning element. For this purpose, it is preferable to mix a cleaning liquid supply body as shown in FIG. 4 in place of any of the first cleaning bodies 3. Suitable cleaning liquids are distilled water, a mixture of isopropyl alcohol (IPA) and distilled water, a mixture of a surfactant, distilled water and an aliphatic alcohol, and a mixture of these with an antifungal agent. It is better to have high evaporation. The most preferred liquid components are 4 to 8% by weight of surfactant, 20 to 40% of distilled water, and 52 to 76% of resin group alcohol.

The liquid supply body 8 is provided with a through hole 9 in the board body 1, a large diameter liquid reservoir portion 10 which is inserted therein, and a small diameter coating portion 11 which protrudes from the through hole 9 toward the lens side. Are integrally formed of a flexible material such as silicon rubber, and are pressed into the through hole 9 by utilizing this elasticity, so that they can be easily attached and detached when not in use or when they are replaced. The tip opening diameter of the coating part 11 may be set so that the surface tension of the cleaning liquid is larger than the centrifugal force generated when the board 1 rotates at a high speed, and in the case of the optimum cleaning liquid, it may be about 60 to 500 μm. For example, the lens surface can be sufficiently moistened without scattering more than necessary. The liquid is supplied from the back surface side of the board 1 by using a spoid E or the like.

As shown in FIG. 5, the liquid supply body 8 is formed of an elastic body in a so-called duck bill shape in which a tip 12 is tapered as shown in FIG. 5 and a slit 13 is inserted halfway from the tip. As shown in FIG. 6, the displacement of the tip 12 upon contact with the lens 7 causes the liquid to leak and the lens surface to be moistened. This may have a conical shape, and in order to improve the coating performance, it is preferable to cut out the tip 13 on the rotation direction side with slits and apply the liquid on the exposed facing surface 14 on the other side. Reference numeral 15 is an integrally formed retaining protrusion.

The arrangement position of the liquid supply body 8 is not limited to the position of the first cleaning body 3, and if it is a radial intermediate position between the first cleaning body 3 and the second cleaning body 4, a head that requires high reading accuracy is required. The cleaning lens 7 can be reliably cleaned.

Of course, it is preferable that the liquid supply body 8 is also arranged in a point-symmetrical position with respect to the center of the board body in order to prevent imbalance during rotation of the board body 1 at a high speed. Further, in any of the embodiments, the same operation can be performed on a CD, a constant angular velocity type (CAV mode type) disc, or an electronic file disc.

[0021]

[Effect of the device]

 As described above, according to the present invention, a plurality of types of cleaners having different projecting lengths from the board surface are provided, so that the optical head unit with the tilt sensor can be securely attached to the lens without applying an excessive load. The surface can be cleaned.

[Brief description of drawings]

FIG. 1 is a perspective view of a board according to an embodiment of the present invention.

FIG. 2 is a plan view of the board of the embodiment.

FIG. 3 is a cleaning state diagram using the same embodiment.

FIG. 4 is a partial sectional perspective view of another embodiment according to the present invention.

FIG. 5 is a partial perspective view of still another embodiment according to the present invention.

FIG. 6 is a liquid application state diagram of the other embodiment.

[Explanation of symbols]

 1 Board 3 First Cleaning Body 4 Second Cleaning Body

Claims (1)

[Scope of utility model registration request] 1. A cleaning member for an optical head provided with a plurality of types of lens surface cleaning bodies having different protruding lengths from the board surface.