JP3024083U - Optical pickup cleaning device - Google Patents

Abstract

(57) Abstract: A cleaning brush that reaches the objective lens surface of an optical pickup can be housed in a jacket in an upright state. SOLUTION: A cleaning brush 18 of a jacket housing 20.
On the inner surface of the plate portion of the half body 20a facing to, the ring-shaped groove 24 is provided in the range including the radial position of the cleaning brush 18. The depth of the groove 24 is such that the cleaning brush 18 can be maintained in the upright state while the cleaning disk 10 is pressed against the inner surface of the half body 20b of the jacket housing 20. A circular recess may be used instead of the ring-shaped groove 24. Furthermore, the plate portion may be thin as a whole.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an optical pickup cleaning device for cleaning an objective lens of an optical head.

[0002]

[Prior art]

 Optical discs and magneto-optical discs are known as disc-shaped recording media which use optical means for recording and reproducing information. Further, these disc-shaped recording media have recently been generally enclosed in a jacket or a cartridge for the purpose of protecting the recording surface from finger fat and small dusts and facilitating portability and storage. Is. In that case, one side of the jacket is provided with a window which allows the spindle shaft of the drive to engage the central bore of the disc medium. In general, the jacket is also provided with a shutter that exposes the surface of the disk medium when loaded in the drive device.

Further, in the case of an optical disc, in order to maintain high signal quality, it is necessary to appropriately clean an objective lens of an optical head or an optical pickup used for recording or reproduction, and various cleaning means for that purpose are proposed. Has been done. For example, a cleaning disk in which a cleaning brush or chamois is mounted upright on the surface of the disk medium has been proposed and put into practical use (eg, Showa 60 Patent Application Publication No. 40537 and 1992 Utility Model Application Publication). No. 31474). As a document disclosing a cleaning disk with a jacket, there is a utility model application publication No. 52016 published in 1994.

In the mini disk recording / reproducing system proposed by Sony Corporation, as shown in FIG. 2, the height of the cleaning brush needs to be 1.5 mm or more (preferably about 1.6 mm). Further, as shown in FIG. 3, the jacket of the mini disc has an outer dimension of 5.9 mm and an inner dimension of 3.0 mm in the thickness direction. The internal disk medium has a margin of about 1.05 mm in the direction perpendicular to the medium surface, but it is far below the height of 1.5 mm required for the cleaning brush. Due to these dimensional conditions, when the cleaning disk shown in Fig. 2 is housed in the jacket, the brush hits the inner surface of the jacket, and the brush is always lying down or bent, so that the cleaning brush picks up the light when cleaning the core. There is a problem that it does not come into contact with the objective lens surface.

On the other hand, the applicant of the present invention has proposed a structure in which a large opening for constantly exposing the brush is opened on a predetermined surface of the jacket, as described in Japanese Utility Model Registration No. 3008725.

[0006]

[Problems to be solved by the device]

 In the configuration described in FIGS. 4 and 5 of Utility Model Registration No. 3008725, dirt and dust that stains the disk medium itself easily enter through the opening for exposing the cleaning brush to the outside, and record on the disk medium. It becomes difficult to play the music being played and messages such as cleaning start and / or end.

An object of the present invention is to provide an optical pick-up cleaning device capable of maintaining a cleaning tool such as a brush in an upright state even in a jacket.

[0008]

[Means for Solving the Problems]

 By forming a recess of a predetermined depth inside the plate material of the jacket housing facing the cleaning tool, or by making the plate material thin enough, there is no opening larger than usual that constantly exposes the cleaning tool. Complete. As a result, the disk medium surface of the cleaning disk is less likely to get dirty. Further, the height of the cleaning tool can be set high enough to clean the objective lens surface of the optical pickup. With these, a high cleaning effect can be obtained.

[0009]

[Embodiment of device]

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a central sectional view of an embodiment of the present invention applied to a mini disk recording / reproducing system. The basic structure of the cleaning disk 10 is a disk-shaped base material 12 made of tempered glass or high-strength plastic, and a metal hub 14 for receiving the spindle shaft of the disk drive device. ing. Of course, the detailed structure varies from manufacturer to manufacturer. The hub 14 is prevented from falling off the base material 12 by the pressing ring 16. That is, the hub 14 is sandwiched between the base material 12 and the pressing ring 16.

At an appropriate radial position of the base material 12 (for example, before the recording position of the first information logically or physically), a cleaning brush 18 as a cleaning tool is directly or via a removable mount member. Installed. A plurality of cleaning brushes 18 may be installed.

Reference numeral 20 denotes a jacket housing that houses the cleaning disk 10, and has a structure in which two halves 20 a and 20 b are bonded to each other. In the center of the face plate of the lower half body 20a of the housing 20, there is formed an opening 22 of a normal size for the spindle shaft to penetrate. That is, the opening 22 is so small that the spindle shaft can intervene in the hub 14 so as not to touch the base material 12 with the fingers of the hand.

A ring-shaped groove (or dent) 24 is cut on the inner surface of the half body 20a over a predetermined width including the radial position of the cleaning brush 18 except for the portion blocked by the shutter. . The depth of the groove 24 is such that the tip of the cleaning brush 18 does not contact the bottom surface of the groove 24 when the cleaning disk 10 is pushed up in the jacket housing 20. Specifically, at the groove 24, the thickness of the half body 20a is set to about 3 mm. Even with this, there is no lack of strength. In addition, there is no problem in manufacturing, either by cutting the groove 24 on the half body 20a that has already been used or by molding the half body 20a with the groove 24.

Due to the ring-shaped groove 24, even if the height of the cleaning brush 18 is about 1.6 mm, as long as the cleaning disk 10 is in contact with the inner surface of the half body 20b, the cleaning brush 18 is half the size. The inner surface of the body 20a prevents the person from falling asleep. That is, the half body 20b may be always stored downward or may be stored in the storage case described in Utility Model Registration No. 3008725. As a result, the cleaning disk 10 is always held at the position closer to the half body 20b, so that the cleaning brush 18 can be kept in the upright state.

FIG. 4 shows a central sectional view of an embodiment in which a space for the cleaning brush 18 is secured in the entire inner region including the cleaning brush 18 instead of the ring-shaped groove 24. A jacket housing 30 for housing the cleaning disk 10 has a structure in which two halves 30a and 30b are bonded to each other. A position similar to the opening 22 is provided in the center of the half body 30a of the housing 30. And an opening 32 having a size. A circular recess 34 having a depth similar to that of the groove 24 is formed on the entire inner surface of the face plate of the half body 30a from the radial position slightly outside the cleaning brush 18 to the inner side. The thickness of the half body 30a in the recess 34 is about 3 mm, and there is no deficiency in strength, but the strength is relatively weaker in the peripheral portion of the opening 32 than in the case of the groove 24. Similar to the ring-shaped groove 24, there is no problem in forming the recess 34, whether by cutting or by molding the half body 30a with the recess 34 as it is.

Furthermore, as shown in FIG. 5, the face plate itself facing the cleaning 18 may be thinly formed. That is, in this modified embodiment, the half body 40b of the jacket casing 40 is exactly the same as the half bodies 20b and 30b of the previous embodiment, and the face plate 42 of the half body 40a is pressed against the half body 40b. In this state, the cleaning brush 18 is made thin so that it does not contact the inner surface of the face plate 42. In comparison with the groove 24 and the recess 34, the thickness of the face plate 42 is set to about 3 mm as a whole. However, if it is left as it is, the disk medium 10 is apt to rattle in the jacket. In order to suppress this, the protrusions 42b having the same thickness as a normal jacket may be provided near the center of each of the four sides of the face plate 42 to suppress the rattling of the cleaning disk 10.

In this way, in this embodiment, the cleaning brush 18 has a height capable of reliably cleaning the objective lens of the optical pickup, and at the same time, the cleaning brush 18 can be maintained in a standing state in the jacket at all times. Can be cleaned. Further, the openings 22 and 32 can be made to have the same size as a normal recorded disk or a recording / reproducing disk, so that the inner disk medium is not polluted.

Although the embodiment applied to the mini disk recording / reproducing system has been described, the present invention is a recording / reproducing system using an optical disk containing a jacket or a cartridge, such as a magneto-optical disk and a phase change optical disk. Needless to say, it can be applied as a means for cleaning the objective lens of. The height of the cleaning brush, the depth of the groove or indent in the jacket, or the thickness of the face plate is determined by the specifications of those systems.

[0019]

[Effect of device]

 As can be easily understood from the above description, according to the present invention, the cleaning tool for the cleaning disk can be maintained upright in the jacket, and the height of the cleaning tool can be adjusted to the objective lens surface of the optical pickup. You can set the height to reach. As a result, a higher cleaning effect can be achieved. Further, since the opening for exposing the cleaning tool to the outside is not provided, the surface of the disk medium is less likely to get dirty.

[Brief description of drawings]

FIG. 1 is a central sectional view of an embodiment of the present invention.

FIG. 2 is a central cross-sectional view of a cleaning disc.

FIG. 3 is a central cross-sectional view of a mini disc.

FIG. 4 is a central sectional view of a second embodiment of the present invention.

FIG. 5 is a central sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 10: Cleaning disk 12: Base material 14: Hub 16: Pressing ring 18: Cleaning brush (or chamois etc.) 20: Jacket housing 20a, 20b: Half body 22: Opening 24: Ring groove 30: Jacket housing 30a , 30b: Half body 32: Opening 34: Circular recess 40: Jacket housing 40a, 40b: Half body 42: Face plate 42b: Protrusion

Claims (5)

[Scope of utility model registration request] 1. An optical pickup cleaning device comprising: a cleaning disk having at least one cleaning tool for cleaning an objective lens surface of an optical pickup provided on a medium surface; and a jacket housing containing the cleaning disk. An optical pickup characterized in that a recess of a predetermined depth is formed inside a plate material of the jacket housing facing the cleaning tool so that the tip of the cleaning tool does not contact the inner surface of the plate material in a predetermined state. Cleaning device. 2. The optical pickup cleaning device according to claim 1, wherein the recess is a ring-shaped groove including a radial position of the cleaning tool. 3. The optical pickup cleaning device according to claim 1, wherein the recess is formed by thinning the plate material including the cleaning tool on an inner peripheral side thereof. 4. An optical pickup cleaning device comprising: a cleaning disk having at least one cleaning tool for cleaning an objective lens surface of an optical pickup provided on a medium surface; and a jacket housing containing the cleaning disk. An optical pickup cleaning device, characterized in that a plate material of the jacket housing facing the cleaning tool is made thinner than usual so that a tip of the cleaning tool does not contact an inner surface of the plate material in a predetermined state. 5. One or more predetermined locations around the plate material are
The optical pickup cleaning device according to claim 4, wherein the optical pickup cleaning device has the same thickness as a normal one.