JPH0110792Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cassette that accommodates an optical disc that is played by an optical disc player such as a compact disc player, and particularly relates to a cassette that accommodates an optical disc that is played back while being stored in a cassette case. The present invention relates to an optical disk cassette for use in disc storage.

[Prior art]

Optical discs played by compact disc players are standardized to have a disc shape with a diameter of 120 mm and a thickness of 1.2 mm, with a central hole in the center having an inner diameter of 15.0 ^+0.1 _-0 mm. There is. This optical disc has digitized, for example, audio signals optically recorded on its surface, and if this recording surface becomes scratched or dirty, it will affect optical reading, so handling is not recommended. Sufficient caution is required. Therefore, these optical discs are sold and stored in a cassette case that opens and closes using one side as a fulcrum, and when playing, the cassette case must be opened, the optical disc taken out, and then loaded into a compact disc player. I'm starting to do that.

However, in order to play the above-mentioned optical disc, it is necessary to take it out of the cassette case and set it in the player, making the operation extremely complicated. Particularly in recent years, compact disc players have been installed in cars, and it is extremely difficult to remove and set an optical disc from the cassette case with one hand while driving a car, which is also a problem from a safety standpoint when driving a car. It is.

In order to solve these problems, the applicant of the present invention has previously proposed an optical disc cassette that can be set in a player while the optical disc is housed in the cassette case. This optical disk cassette case has a shaft in the center of the main body of the cassette case with a lid, and a disk-shaped clamp disk with a diameter slightly larger than the center hole of the optical disk is coaxially attached to this shaft so that it can rotate freely. It is being
A disk clamper protrudes from the surface of the clamp disk coaxially with respect to the center of rotation, thereby engaging with the inner wall portion of the central hole of the optical disk to fix the optical disk. On the other hand, a central hole is provided in the portion of the lid that faces the disc clamper, through which a clamper grip for rotational coupling provided at the tip of the disc rotation shaft in the player passes. Further, a reading slit is provided in the movement range of the objective lens of the optical head when the lid is preset.

The optical disk cassette constructed in this way is configured so that the optical disk is stored in the cassette case, that is, the optical disk is fixed to the clamp disk by the disk clamper, and then the lid is closed and the optical disk is set together with the disk cassette case. insert. Then, the clamper grip provided at the tip of the disk rotation shaft is connected to the disk clamper, rotates the optical disk integrated with the clamp disk, and regulates the center of rotation. The optical head also reads recorded information by emitting a light beam from an objective lens onto the surface of an optical disk mounted on the lid of a cassette case and detecting the reflected light. .

[The problem that the invention is trying to solve]

However, in the optical disk cassette with the above configuration, the disk clamper firmly fixes the optical disk to the clamp disk, and the clamp disk is pivotally supported at the center inside the main body of the disk cassette case. For this reason, the rotation axis of optical disks is also almost regulated. On the other hand, if the position of the rotation axis of the clamp disk in the set optical disk cassette deviates by a relatively large amount with respect to the disk rotation axis of the disk player, the clamp disk installed at the tip of the rotation shaft of the disk clamper and the disk drive motor may The connection with the rotating connection part becomes uncertain,
If the rotation of the optical disk becomes unstable, or if the positions or directions of both rotational axes deviate by a relatively large amount, there is a problem in that the rotational connection portions cannot be connected.

[Means for solving problems]

Therefore, the optical disk cassette according to the present invention is
A disc-shaped disc pat spring installed in a hole provided in the center of the disc cassette case with a lid, a cylindrical disc pat retainer coaxially engaged with the disc pat spring, and a central part of the optical disc. It has a shaft protruding from the center of rotation of the base body, which is in the shape of a disk with a larger diameter than the hole, and the tip of this shaft has an arrow-shaped cross section, and its neck portion is held at the center of rotation of the disc retainer. a disc part, an opening for passage of a rotating shaft provided in a portion of the lid body facing the disc part, and a slit provided in a movement range of the optical head when it is set in a disc player, An optical disc is housed between the disc part and the lid, and when the disc is set in a disc player, a truncated conical centering core provided at the tip of the disc rotation shaft presses against the center hole of the optical disc and the disc part. The shaft transmits rotational force and regulates the center of rotation of the optical disc and disc part. When the disc part receives the pressing force applied to the optical disc, the tip of its shaft is pressed by the disc part spring and acts as a movable pivot bearing. It is what it is.

[Effect]

In the optical disc cassette constructed in this manner, the disc part spring and the tip of the shaft provided on the disc part constitute a movable pivot bearing, so that the rotation axis of the optical disc is controlled by the disc rotation. This means that even if there is some misalignment between the rotation center of the optical disk and the disk rotation axis, the optical disk will be aligned and the optical disk will remain in a stable state. This means that it can be rotated.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of an optical disk cassette according to the present invention. In the figure, reference numeral 1 denotes a disk cassette case, which is composed of a main body 2 having a space for accommodating an optical disk (compact disk) and a lid 3, both of which are connected by a shaft 4 on one side. It can be opened and closed.

Here, the main body 2 has a relatively large-diameter opening 5 in the central part, and a disc pat spring 6 is provided to close this opening 5. As shown in the figure, a part of the peripheral side of the disc-shaped member is cut off to increase its elasticity. Furthermore, three holes 7 are provided at positions surrounding the center of the disc pat spring 6. and,
Each pawl 8 of a disc pat retainer 9 having three pawls 8 at one end of the cylindrical body is inserted into the hole 7 provided in the disc pat spring 6 to prevent the pawls 8 from coming off. It is locked by this. Further, the other end side of this disk pack retainer 9 has a small hole 10 on its end surface,
A plurality of slits in the radial direction are provided around the periphery, thereby forming the claws 11 directed inward. Reference numeral 12 denotes a disk part, and the base body 12 has a larger diameter than the center hole 17 of the optical disk 16, which will be described later.
a, and its outer peripheral portion is slightly raised to form a ring-shaped portion 12b. Further, a ring-shaped portion 12b is provided at the center of rotation of the base body 12a.
It has a conical projection 12c for regulating the center of rotation that projects in the direction in which the projection 12c projects, and a shaft 12d that projects in the opposite direction to the direction in which the projection 12c projects. The shaft 12d has a conical tip and a constricted base. Reference numeral 13 denotes an opening provided in a portion of the lid 3 facing the disk part 12, and is sized to allow a centering core 20, which will be described later, to pass therethrough. A ring-shaped protrusion 14 is provided around the opening 13 and protrudes toward the main body 2, and the tip thereof has a semicircular cross section. Reference numeral 15 denotes a reading slit provided in a portion of the lid 3 facing the movement range of the optical head when it is set in the disc player.

When storing the optical disc 16 in the optical disc cassette constructed in this way, first open the lid 15 and place the ring-shaped disc cassette in the disc holder 12 with the information recording surface of the optical disc 16 facing upward. It is placed on the end face portion of the portion 12b. Therefore, in this case, since the outer diameter of the disk part 12 is made larger than the center hole 17 of the optical disk 16, the end surface of the ring-shaped part 12b is made to be larger than the center hole 17 of the optical disk 16. It will be held by joining it to the outer peripheral part of the. In this state, cover 3
When the disc part 12 is closed, as shown in an enlarged sectional view of the main part of the disc part 12, the disc part 12 is held between the end face of the ring-shaped part 12b and the lid body 3, so that it can be stored. will be carried out. In this case, since the aperture 13 provided in the lid body 3 has a ring-shaped protrusion 14 that protrudes inward, the information recording surface of the optical disc 15 is It is protected by being suspended by the protrusion 14.

Next, when playing an optical disc, with the optical disc 16 housed in the disc cassette case 1, for example, place the lid with the lid 3 side facing down, that is, the side where the disc motor shaft and optical head of the disc player are installed. Insert it into the disc player with body 3 facing. Then, as shown in FIG. 4, the position of the disk cassette case 1 in the operating direction is regulated by a stopper (not shown).
That is, the aperture 13 provided in the lid 3 and the centering core 20 fixed to the tip of the rotating shaft 19 of the disk motor 18 are aligned. Next, the disk player
Loading is completed by lowering the positioned disk cassette 1 to a predetermined position.

Here, when the disk cassette case 1 starts to descend during loading, as shown in FIG. The center of rotation of the optical disk 16 is then aligned with the rotation axis 19. When the disk cassette case 1 further descends, the optical disk 16 is lifted from the protrusion 14 of the lid 3 against the force of the disk pad spring 6. In this state, since the central hole 17 of the optical disk 16 is firmly fitted into the sloped portion of the outer circumferential portion of the centering core 17, rotational force can be sufficiently transmitted. In addition, in this state, the flat surface of the flange-like portion 20a provided on the centering core 20 presses the lower surface of the optical disk 16, and the rotating shaft 1
The inclination is regulated so that it is horizontal to 9.

On the other hand, the projection 12c of the disc part 12 engages with a needle-shaped hole 20b provided at the center of rotation on the upper surface of the centering core 19, so that the axial center of the disc part 12 is adjusted by the slope of the protrusion 12c. is aligned with the axis of the rotating shaft 19. In this case, since the shaft 12d of the disc pad 12 is held relatively loosely by the disc pad retainer 9, the shaft can be easily moved by the centering core 20. When the loading of the disk cassette case 1 is completed, the centering core 20 positions the disk part 12 at its axial center, and as shown in FIG. In order to lift it up, the disc pat spring 6 is deformed into a mountain shape with the apex at the portion against which the tip of the shaft 12d is pressed. Since the tip of this shaft 12d is conical, it supports the disk part 12 by serving as a pivot bearing through point contact where rotational friction is minimized.

When the disk motor 18 is driven in this state, the rotational force is transmitted to the optical disk 16 via the centering core 20, and as a result, the optical disk 16 is moved between the disk part spring 6 and the disk part. Axis 12d in 12
It will rotate stably around the joint with the tip.

In the above embodiment, a disk-shaped disk patch spring was used, but a spring with a gimbal structure may also be used, and in short, any structure may be used as long as the spring body has a flat part in the center. Also good.

[Effect of idea]

As explained above, in the optical disc cassette according to this invention, the center of rotation of the optical disc and the disc part can be easily adjusted by the centering core provided at the tip of the disc motor shaft when the optical disc and the disc part are set in the disc player. Therefore, even if there is a slight deviation in the relationship between the two, it is automatically corrected and stable rotation can be obtained, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the optical disk cassette according to the present invention, FIG. 2 is an exploded perspective view of the disk cassette spring, disk cassette retainer, and disk cassette shown in FIG. A sectional view of the main part showing a state in which the disk is accommodated,
FIGS. 4 and 5 are sectional views of essential parts showing the state in which the disc player is set. 1...Disk cassette case, 2...Main body,
3... Lid body, 4... Shaft, 5... Opening hole, 6... Disc part spring, 7... Hole, 8... Claw, 9
... Disc part retainer, 12... Disk part, 12a... Base body, 12b... Ring-shaped part, 12c... Protrusion, 12d... Shaft, 13... Opening, 14... Protrusion, 15... Slit, 16...
Optical disk, 17...center hole.

Claims (1)

[Scope of utility model registration request] A disk cassette case having a lid body has a disk cassette case with a flat central portion attached to the opening provided in the center of the main body at least in normal times, and a disk latched to the center portion of the disk cassette case. The disc retainer and the neck portion of the shaft, which has a conical tip protruding from the center of rotation of the disc-shaped base body with a larger diameter than the central hole of the optical disk, are held by the disc retainer, and the outer periphery of the base body is held by the disk retainer. a disc part that protrudes in the opposite direction to the axis and forms a ring-shaped part;
An opening for passing through a centering core attached to the rotating shaft of the disc player is provided in a portion of the lid facing the disc part, and an opening is provided in the movement range of the optical head when the disc player is set in the lid. An optical disc is housed between the disc part and the lid, and when the optical disc is set in a disc player, a conical centering core provided at the tip of the rotating shaft is inserted into the center of the optical disc. By engaging with the hole and the disc part, the center of rotation is regulated, and by pressing the optical disc towards the main body, the optical disc is lifted from the lid body, and the tip of the shaft provided in the disc part is pushed against the disc. An optical disk cassette characterized in that it serves as a rotational fulcrum by pressing against a patch spring.