JPH0753197Y2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The disc player of the present invention will be described in detail according to the following items.

A. Industrial fields of use B. Overview of the device C. Background technology [Fig. 6] D. Problems to be solved by the device [Fig. 6] E. Means for solving the problem F. Example [Chapter 1 to 5] a. Disk cassette [Figs. 1 to 3 and 5] b. Outer housing, cassette holder, etc. [Figs. 1 to 3] c. Mechanical deck [Figs. 1 to 1] Fig. 4] d. Rotation of magneto-optical disk [Figs. 1 to 3] e. Generation of air flow, dust-proof filter [Figs. 1 to 4] G. Effect of device (A. Industrial use FIELD The present invention relates to a novel disc player. For more information,
The present invention relates to a disc player that uses a disc cassette in which an optical disc is rotatably housed inside a cassette case and an opening for exposing a part of the optical disc to the outside is formed in the cassette case. It is an object of the present invention to provide a new disc player capable of preventing the airflow generated by the rotation of a disc from entering the cassette case and adhering to the objective lens of an optical pickup.

(B. Outline of the Invention) Among the disk player side members, the disk player of the present invention is close to the opening of the disk cassette when the disk cassette is installed, and is generated by the rotation of the optical disk from the above-mentioned opening in the disk cassette. Since the dustproof filter is disposed at the windward position of the inflowing airflow, the airflow generated by the rotation of the optical disk is made to pass through the dustproof filter when flowing into the cassette case through its opening. It is possible to prevent dust from being contained in the air that flows into the cassette case or is blown to the optical pickup, and thus to prevent dust from adhering to the optical disc, the objective lens of the optical pickup, or the like.

(C. Background Art) [Fig. 6] There are various types of optical discs, and among them, if dust is attached to or scratched, such as a magneto-optical disc, the dust or scratches will occur. Is a so-called cassette type in which the optical disc is rotatably housed in a cassette case, it is possible to prevent dust from adhering to the optical disc if the optical disc is likely to cause a read error when recording and reproducing. I have to.

FIG. 6 is a schematic sectional view showing an outline of an example a of such a disc cassette and an example b of a disc player using the same.

In the figure, c is a cassette case of a disk cassette a, in which an optical disk d is rotatably accommodated, and the upper and lower surfaces of the cassette case c have a radius of the optical disk d from a substantially central portion thereof. Openings e, e extending in the direction are formed. And the disk cassette a
When mounted on disc player b, turntable f
Is the optical disc d of the opening e on the lower side of the openings e.
Is inserted into the cassette case c from a portion corresponding to the central portion of the optical disc d, and the central portion of the optical disc d is placed on the cassette casing c, and the optical pickup g is inserted into the cassette case c from the lower opening e of the optical disc d. It faces the part exposed to the outside.

When recording or reproducing, the optical disc d
Rotates integrally with the turntable f, and in this state, the optical pickup g irradiates the optical disc d with a laser beam to write or read a signal.

The openings e, e are closed by a shutter (not shown) that can be opened and closed, and when the disk cassette a is mounted on the disk player b, the shutter moves to a position where the openings e, e are opened, and otherwise. At this time, the shutter is held at the position where the openings e, e are closed, and
When the disc cassette a is pulled out from the disc player b, dust is prevented from entering the cassette case c.

(D. Problem to be Solved by the Invention) [FIG. 6] By the way, in the disc player b of this type, a cassette attaching / detaching port i for attaching / detaching the disc cassette a to / from the outer casing h and a circuit component. Since a heat dissipation hole or the like is provided for radiating the heat generated in the outer housing h to the outside, it is difficult to completely prevent dust from entering the outer housing h.

When the optical disc d rotates, an air flow that flows in the direction of rotation is generated inside and outside the cassette case c, and this air flow blows up dust accumulated on the inner bottom portion of the outer casing h, so that the air flow is generated. The dust on the openings e, e, especially,
It may enter the cassette case c through the opening e on the lower surface side facing the inner bottom side of the outer housing h and adhere to the optical disc d, or adhere to the objective lens j of the optical pickup g. In addition, there is a problem that dust adhering to the optical disc d or the objective lens j causes signal dropout during recording or reproduction.

(E. Means for Solving the Problem) In order to solve the above-mentioned problems, the disc player of the present invention approaches the opening of the disc cassette among the disc player side members in a state where the disc cassette is mounted, A dustproof filter is arranged at the windward position of the airflow generated by the rotation of the optical disk and flowing into the disk cassette through the opening.

Therefore, in the disc player of the present invention, even if the airflow generated by the rotation of the optical disc flows into the disc cassette through its opening or is blown to the optical pickup, the air passes through the dustproof filter to remove dust. Since it is done, it is possible to prevent dust from adhering to the optical disc or the objective lens of the optical pickup, and the dust filter removes dust inside the outer casing. Since the atmosphere inside the outer casing is cleaned, the effect of preventing dust from adhering to the optical disc and the like can be further enhanced, and only the dust filter is the only means for preventing such dust from adhering to the disc player. There is no complicated structure or cost.

(F. Embodiment) [Figs. 1 to 5] The details of the disc player of the present invention will be described below with reference to the illustrated embodiment.

In the illustrated embodiment, the present invention is applied to the magneto-optical disc player 1.

First, an example of a magneto-optical disk cassette used in the magneto-optical disk player 1 will be described, and then the magneto-optical disk player 1 will be described.

(A. Disc cassette) [Figs. 1 to 3 and 5] 2 is a disc cassette in which the magneto-optical disc 3 is rotatably accommodated.

Reference numeral 4 denotes a cassette case of the disc cassette 2. The cassette case 4 is relatively thin and has a rectangular shape close to a square because two flat case halves 5 and 6 made of synthetic resin are integrally combined. It is formed in a box shape.

Then, the case halves 5 and 6 have openings 7 and 7 ', respectively.
The openings 7 and 7 ′ are formed from the central portion of each case half 5 and 6 to near one end edge in the longitudinal direction thereof, and the portions 7 a and 7 located at the central portions of the case halves 5 and 6 are formed. 'A (hereinafter "turntable insertion part")
Say ) Has a substantially circular shape, and the other portions 7b and 7'b (hereinafter referred to as "window portions") are formed in a rectangular shape.

Reference numeral 8 is a center core fixed to the center of the magneto-optical disk 3, and the magneto-optical disk 3 is positioned so that the center core 8 corresponds to the turntable insertion portions 7a and 7'a of the openings 7 and 7 '. In this state, the cassette case 4 is rotatably housed.

Reference numeral 9 denotes a shutter, which is formed of a metal plate so as to have a flat and substantially U shape, and has two closing pieces 10 facing each other,
10 'is formed in a plate shape slightly larger than the openings 7, 7', and the closing pieces 10, 10 'are located in the shallow recesses 11, 11' formed on the outer surfaces of the case halves 5, 6, and the openings 7, 10 'are formed. The disc cassette 2 is supported so as to be movable in the width direction of 7 ', and the moving force in the direction of closing the openings 7 and 7'is always urged by the elastic means (not shown), so that the disc cassette 2 is disc player. 1 is not attached, it is shown in the closed position in which the opening 7, 7'is closed by the locking means (not shown) (in the drawings, the opening 7, 7'is shown in the open position). There is a lock.

(B. Outer housing, cassette holder, etc.) [FIGS. 1 to 3] 12 is an outer housing of the magneto-optical disk player 1, and its front face portion 13 (the direction toward the right in FIG. 2 is the front side, The direction to the left is the rear side, the direction to the lower side in the figure is the left side, and the direction to the upper side is the right side. In the following description, the direction is based on this direction.) An elongated cassette attaching / detaching port 13a is formed in the left-right direction at a position near the upper end of the.

Reference numeral 14 denotes a cassette holder into which the disc cassette 2 is detachably loaded, and is supported by a support frame 15 fixed inside the outer casing 12 so as to be vertically movable.

The cassette holder 14 includes a top plate 16 having a substantially rectangular shape that is long in the front-rear direction, short side walls 17 and 17 extending downward from both left and right edges of the top plate 16, and the side wall 17 , A narrow receiving piece 18 projecting inwardly from the lower edges of the 17,
18 and the distance between the side walls 17 is larger than the width of the disc cassette 2, and the top plate 16 and the receiving piece 18 or 18 are provided.
The distance between the and is larger than the thickness of the disc cassette 2.

Such a cassette holder 14 is at a standby position which is substantially at the same height as the cassette attaching / detaching port 13a and a chucking position which is slightly lower than the standby position (shown in this state in FIG. 3). The disk cassette 2 is loaded and unloaded while it is supported by the support frame 15 so as to move between the disk cassette 2 and the cassette holder 14 at the standby position.

The abutting pieces 18a, 18a are formed so as to rise from the rear end edges of the receiving pieces 18, 18 (only one of which is shown in FIG. 3).
The loading of the disc cassette 2 into the cassette holder 14 is completed when the cassette case 4 contacts the contact pieces 18a, 18a.

The disc cassette 2 is loaded into the cassette holder 14 with the connecting portion connecting the closing pieces 10 and 10 'of the shutter 9 facing rearward.

Reference numerals 19 and 20 denote shutter release levers, the base ends of which are horizontally rotatably supported at the left and right ends of the rear end of the top plate 16, and approximately half of the pivot ends are in the vertical position. On the other hand, the one 19 is almost the same as the top plate 16, and the other
20 is bent at an intermediate portion so as to be substantially the same as the receiving pieces 18, 18 and a pin 19 projecting downward is provided at a rotating end thereof.
a, or a pin 20a protruding upward is provided respectively. Then, the shutter release levers 19 and 20 are biased by a not-illustrated elastic means so as to rotate toward the side wall 17 or the side wall 17 having its own rotation fulcrum close to each other, and the disc cassette 2 Is not inserted in the cassette holder 14, the pin 19a or 20a is held at a position where it engages with the engaging portion of the shutter 9 of the disk cassette 2 inserted in the cassette holder 14, and the cassette holder 14 holds the disk cassette. When 2 is inserted, the pin 19a or 20a is pressed by the shutter 9 to rotate the shutter release levers 19 and 20, and at this time, the pin 19a or 20a moves the shutter 9 to the open position. It is designed to be moved.

(C. Mechanical deck) [Figs. 1 to 4] 21 is a mechanical deck.

22 is a mechanical chassis that forms the base of the mechanical deck 21.

Reference numeral 23 denotes a disk drive device arranged at a position closer to the front side than the central portion of the mechanical chassis 22. The disk drive device 23 covers the turntable arrangement hole 24 formed in the mechanical chassis 22 from below. A substantially bowl-shaped motor support member 25 fixed to the lower surface, a drive motor 26 attached to the inner bottom surface of the motor support member 25, a turntable 27 fixed to the output shaft of the drive motor 26, and the like, Most of the turntable 27 is located at a position slightly higher than the upper surface of the mechanical chassis 22 and has a substantially cylindrical shape with its upper surface opened in the axial direction and has a center core 8 of the magneto-optical disk 3 therein. A magnet (not shown) for adsorbing is attached.

Reference numeral 28 denotes an opening formed in the mechanical chassis 22. The opening 28 is located on the rear side of the disk drive device 23 and in the front-back direction so as to face the opening 7 or 7'of the loaded disk cassette 2. The optical pickup, which will be described later, is formed so as to be long and protrudes upward through the opening 28.

Reference numeral 29 is a guide shaft, 30 is a screw shaft extending in parallel with the guide shaft 29, and the guide shaft 29 and the screw shaft 30 are located below the mechanical chassis 22, and generally the opening portion of the mechanical chassis 22 is provided.
It is arranged so as to extend in the front-back direction while facing 28.
Both ends thereof are supported by supporting means (not shown) attached to the mechanical chassis 22, and the screw shaft 30 is rotated by a motor for head feeding (not shown).

Reference numeral 31 is an optical pickup, which is equipped with an objective lens 32.
A shaft drive unit 33 (only the outer shell is shown in the drawing) and an optical system (not shown) are provided, and the beam from the laser light source is emitted upward through the objective lens 32. The optical pickup 31 is supported by the guide shaft 29 and the screw shaft 30 and is moved along the guide shaft 29 as the screw shaft 30 rotates.

Further, a cassette positioning portion (not shown) is provided on the upper surface of the mechanical chassis 22. When the cassette holder 14 moves to the chucking position with the disk cassette 2 loaded therein, the disk cassette 2 is positioned as described above. The disc cassette 2 is positioned in the height direction and the horizontal direction with respect to the mechanical chassis 22 by being crimped to the portion.

(D. Rotation of magneto-optical disk, etc.) [FIGS. 1 to 3] At the same time as the disk cassette 2 is pressure-bonded to the cassette positioning portion, the turntable 27 is relatively moved to one side of the cassette case 4. Is inserted into the cassette case 4 through the turntable insertion portion 7a (or 7'a) of the opening 7 (or 7 ') of the optical disc 3 and the center core 8 of the magneto-optical disc 3 is adsorbed to the turntable 27. The magneto-optical disc 3 is brought into a state in which it can rotate integrally with the turntable 27, and at the same time, the optical pickup 31 passes through the window portion 7b (or 7'b) of the opening 7 (or 7 ') and is rotated. Is opposed from below.

Reference numeral 34 denotes a permanent magnet for generating an external magnetic field, which is moved downward at substantially the same time as the cassette holder 14 is moved to the chucking position, and the window portion of the other opening 7 '(or 7) of the cassette case 4 is opened. The magneto-optical disk 3 is closely faced and opposed through 7'b (or 7b).

For recording and reproducing signals to and from the magneto-optical disk 3, the turntable 27 rotates from this state to rotate the magneto-optical disk 3 (the direction of rotation is counterclockwise as viewed from above), and at the same time, optical This is performed by irradiating the magneto-optical disk 3 with a laser beam from the pickup 31.

(E. Generation of air flow, dustproof filter) [Figs. 1 to 4
[FIG.] When the magneto-optical disk 3 rotates, an air flow that flows in the same direction as the above-described rotation direction of the magneto-optical disk 3 is generated inside the cassette case 4, and this air flow further causes the opening 7 of the cassette case 4. It flows in or out through the cassette case 4 through 7 '. Since the cassette case 4 and the mechanical chassis 22 are extremely close to each other, the opening 7 (or 7 ') and the opening 28 are positioned so as to be substantially continuous. Therefore, the opening 7 (or 7'). ), Most of the air flowing into the cassette case 4 becomes the airflows 35, 35, ... (See FIG. 1) flowing from below the mechanical chassis 22 through the opening 28.

36 and 37 are dustproof filters, and these dustproof filters
36 and 37 are provided with outer shells 38 and 38 having a substantially rectangular tubular shape.
The surface of the 38 other than the mounting surfaces 38a, 38a has a substantially mesh shape, and the outer shells 38, 38 are filled with filter materials 39, 39 having a good dustproof effect.

The dust filters 36 and 37 are formed on the lower surface of the mechanical chassis 22 on the right side and the front end of the peripheral edge portion 28a of the opening 28, that is, when the magneto-optical disk 3 is rotated to open from the lower side of the mechanical chassis 22. The airflows 35, 35, ..., Which flow into the cassette case 4 through the portion 28, are attached so as to project downward from the windward positions of the airflows 35, 35 ,. Most of the ... Will be passed through these dustproof filters 36, 37 before flowing into the cassette case 4.

Then, the dust accumulated on the inner bottom portion of the outer casing 12 is soared by the airflows 35, 35, ... Flowing under the mechanical chassis 22, and the airflows 35, 35 ,. Even if it tries to flow into the case 4, the dust will flow into the air flow 3
.. are removed by the filter materials 39, 39 as they pass through the dustproof filters 36, 37, so that the clean air thus dedusted flows into the cassette case 4. Become.

Further, since most of the dust thus removed from the air streams 35, 35, ... Is retained by the filter materials 39, 39 as it is, such dust prevention by the dust filters 36, 37 is repeated. As a result, dust is collected inside the outer casing 12, which cleans the inside of the outer casing 12.

Thus, dust is prevented from adhering to the magneto-optical disc 3 and the objective lens 31.

(G. Effect of the Invention) As is apparent from the above description, the disk player of the present invention has an optical disk rotatably housed therein, and an opening through which a part of the optical disk faces the outside. In a disc player using a disc cassette, of the disc player side members, the air flow that is close to the disc cassette opening when the disc cassette is mounted and that is generated by the rotation of the optical disc and flows into the disc cassette through the opening. The dust-proof filter is arranged at the windward position of.

Therefore, in the disc player of the present invention, even if the airflow generated by the rotation of the optical disc flows into the disc cassette through its opening or is blown to the optical pickup, the air passes through the dustproof filter to remove dust. It is possible to prevent the dust from adhering to the optical disc or the objective lens of the optical pickup, and the dust filter removes dust inside the outer casing. Therefore, the atmosphere inside the outer casing is cleaned, the effect of preventing dust from adhering to the optical disc, etc. can be further enhanced, and only the dustproof filter is the only means for preventing such dust from adhering to the disc. The player structure is neither complicated nor expensive.

In the above embodiment, the dustproof filter is provided only on the windward side of the air flow generated by the rotation of the optical disc among the peripheral edges of the opening formed in the chassis. Alternatively, a dust-proof filter may be arranged on most of them, and by doing so, the dust-removing effect of the dust-proof filter can be further enhanced.

Further, in the above embodiment, the dustproof filter is provided on the lower surface of the chassis, that is, the surface opposite to the surface on which the disc cassette is mounted. However, this is not the case in the disc player shown in the embodiment. When the disc cassette is moved to the chucking position, the opening of the disc cassette and the opening of the chassis are positioned close to each other and substantially continuous, and are generated by the rotation of the optical disc and flow into the disc cassette. This is because most of the airflow is the airflow that passes through the openings from below.For example, if there is a slightly wider gap between the disc cassette and the chassis, the airflow will be on the upper peripheral edge of the chassis opening or on the upper and lower peripheral edges. A dust filter may be provided.

Further, although the dustproof filter is attached to the chassis of the disc player in the above-mentioned embodiment, the present invention is not limited to this, and the dustproof filter is arranged at a position facing the opening peripheral edge of the disc cassette under the outer casing, for example. Alternatively, the disc cassette may be held by the disc holder and may come into contact with or come close to the peripheral edge of the opening of the disc cassette when the disc cassette reaches the chucking position.

The structure of the dustproof filter, the type of the disc player and the structure of the disc cassette to be used, etc., shown in the above-mentioned embodiments are merely examples for carrying out the present invention. It goes without saying that the technical scope of the present invention is not limitedly interpreted.

[Brief description of drawings]

FIGS. 1 to 5 show an example of an embodiment in which the disc player of the present invention is applied to a magneto-optical disc player. FIG. 1 is a plan view showing a notched outer casing and the like, and FIG. An enlarged sectional view of an essential part taken along the line II-II in the figure, and FIG.
Fig. 4 is a sectional view taken along the line III-III in Fig. 4, Fig. 4 is a partially cutaway perspective view seen from the bottom side of the chassis, Fig. 5 is a perspective view of a disc cassette, and Fig. 6 is a schematic sectional view showing an example of a disc player. It is a figure. Explanation of symbols 1 ... Disc player, 2 ... Disc cassette, 3
...... Optical disc, 7,7 '... Aperture, 22 ... Disc player side member, 35 ... Air flow, 36,37 ... Dustproof filter

Claims (1)

[Scope of utility model registration request] 1. A disc player using a disc cassette in which an optical disc is rotatably housed inside and an opening in which a part of the optical disc faces the outside is formed. A disk player characterized in that a dustproof filter is disposed in the installed state in the vicinity of the opening of the disk cassette, and at a windward position of the air flow generated by the rotation of the optical disk and flowing into the disk cassette through the opening.