JPH0110791Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial 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. This invention relates to an optical disk cassette for use in optical discs.

[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 application has previously proposed an optical disc cutter that can be set in a player while the optical disc remains 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, the portion of the lid facing the disc clamper is provided with a central hole 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 rotating shaft connects to the disk clamper, rotates the optical disk integrated with the clamp disk, and regulates the center of rotation. In addition, the optical head irradiates a light beam from the objective lens through a slit provided in the lid of the cassette case onto the surface of the optical disk rotating inside the case, and detects the reflected light. The recorded information is then read.

[Problem that the invention attempts to solve]

However, in the optical disk cassette having the above structure, the clamp disk and the optical disk rotate together in the disk cassette, but the entire back surface of the clamp disk is brought into surface contact with the inner surface of the disk cassette. If it is used in a state in which the disk drive motor is in a state where the disk drive motor is in a bad state, rotational and sliding friction will increase, which will have an adverse effect on the disk drive motor. On the other hand, it is possible to reduce the rotational contact area by providing a ring-shaped protrusion coaxially with the rotation center on the back side of the clamp disk, but in this case too, it is difficult to reduce the rotational sliding resistance. It becomes necessary to reduce the contact area by making the diameter of the ring-shaped protrusion smaller. However, if the diameter of the ring-shaped protrusion is made small, the stability of the clamp disk decreases and rotational runout occurs.
Particularly when used in a vehicle, relatively strong vibrations are applied to the optical disk, which increases the rotational vibration of the optical disk, causing damage to the optical disk and uneven rotation of the optical disk due to the end of the optical disk coming into contact with the disk cassette. There is a problem in that playback troubles occur due to the occurrence of.

[Specific measures to solve the problem]

Therefore, the optical disk cassette according to the present invention is
In order to reduce rotational sliding resistance, a sliding sheet with low frictional resistance is interposed between the disk cassette and the clamp disk.

[Effect]

In the optical disk cassette constructed in this way, since a relatively wide portion on the back side of the clamp disk is supported by the disk cassette via the sliding sheet, rotational vibration of the clamp disk can be reliably prevented. At the same time, rotational and sliding resistance is also reduced, and the load on the disk drive motor is also reduced.

〔Example〕

FIG. 1 is a plan view showing an embodiment of the optical disk cassette according to the present invention, and FIG.
It is an A′ cross-sectional view. 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, a shaft 5 is provided at the inner central portion of the main body 2. A clamp disk 8 having a diameter sufficiently larger than the center hole 7 of the optical disk 6 housed in the disk cassette case 1 is coaxially and relatively loosely supported on this shaft 5.
Further, on the surface 9 of the main body 2 facing the clamp disk 8, a sliding sheet 10 made of a material with extremely low sliding resistance, such as Teflon, is affixed over the entire surface.

Furthermore, a disk clamper 11 is provided on the surface of the clamp disk 8 on the lid body 3 side and projects coaxially with respect to the rotation center. The disk clamper 11 is constructed by juxtaposing inwardly directed claw-like bodies 12 in a ring shape, and its outer periphery is aligned with the inner periphery of the central hole 7 of the optical disk 6. Match. Therefore, when the optical disk 6 is housed in the disk cassette case 1, the disk clamper 11 is press-fitted into the central hole 7, thereby being fixed to the clamp disk 8.

On the other hand, an opening 13 is provided in the center of the lid 3, through which a clamper grip that engages with the disc clamper 10 passes when the disc is set in a disc player, and a part facing the movement range of the optical head is provided. A reading slit (cutout) 14 is provided in the .

The optical disc cassette constructed in this way has a disc clamper 11 in the central hole 7 of the optical disc 6.
After fixing by engaging the lid body 3, the lid body 3 is closed and stored. When playing an optical disc, for example, the lid 3 should be oriented downward, that is, toward the side where the optical head and the clamper grip that connects the disc rotating shaft of the disc player and the disc clamper 11 are provided. Insert the disk cassette case 1 into the set. In this way, the disk cassette case 1 when set in the disk player becomes as shown in FIG. That is, when the disc cassette case 1 containing the optical disc 6 is set in the disc player, the disc rotation shaft 1
Clamper grip 1 provided at the tip of 5
6 engages with the disk clamper 11 and is driven to rotate. In this case, the clamper gripper 16 has a radial protrusion at its tip, and this protrusion engages with the groove between the claw-like bodies 112 constituting the disk clamper 11, thereby transmitting rotational force.
In addition, when the clamper gripper 16 engages with the disc clamper 11, the claw-like body 12 and the light beam are formed in order to spread the claw-like body 12 outward by the tapered surface provided at the tip thereof. The relationship between the disk 6 and the central hole 7 is strengthened.

When the disk motor (not shown) is driven in such a state, the crimper grip 16 provided at the tip of the disk rotation shaft 15 is engaged with the disk clamper 11, so that the clamp disk 8 is moved from the disk cassette. It is rotated within the case 1. Further, since the optical disk 6 is fixed to the clamp disk 8 and the disk clamper 11, the optical disk 6 is also rotated together with the clamp disk 8 within the disk cassette case 1. The information recorded on the optical disk 6 in this rotating state is optically read out by a light beam projected from the optical head through the slit 14 provided in the lid 3. playback will be performed.

Here, the clamp disc 8 is pushed up by the clamper grip 15, but since the sliding sheet 10 is pasted on the inner surface of the main body 2 of the disc cassette case 1, the clamp disc 8 is pressed against the inside of the main body 10 via this sliding sheet 10. In this case, since the sliding sheet 10 is made of a material with extremely low sliding resistance, such as Teflon, the rotational sliding resistance is small and the rotational load on the disk motor is reduced. Further, in this case, since the entire back side of the optical disk 6 is held in surface contact with the clamp disk 8, the optical disk 6 can be securely fixed. Since the entire back side of the clamp disk 8 is held inside the main body 2 via the sliding sheet 10, they are held by the entire surface of each other, and stable rotation without rotational runout can be achieved.

FIG. 4 is a sectional view showing another embodiment of the optical disk cassette according to the present invention, and the same parts as in FIG. 3 are indicated using the same symbols. The difference between this figure and FIG. 3 is that a sliding sheet 17 is used in which the sliding sheet 9 is deformed into a plurality of waves along the direction of rotation. When the sliding sheet 17 is shaped like this, the contact area between the clamp disk 8 and the sliding sheet 17 becomes the apex of the wave, so the contact area is reduced and the rotational sliding resistance is reduced. will further decrease. In this case, the contact area of the wavy sliding sheet 17 is reduced, but
Since this reduced portion is dispersed, there is no problem with regard to safety when holding the clamp disk 8. Furthermore, as shown in FIG. 5, when this wavy sliding sheet is provided as a sliding sheet 18 on the inner surface of the lid 3 excluding the central hole 7 and the slit portion for reading by the optical head, , for some reason the optical disk 6
When the disk tries to come into contact with the lid 3 side, the sliding resistance is reduced and the load on the disk motor is reduced.

In addition, in the above embodiment, the sliding sheet 1
0 and 17 are attached to the inside of the main body 2, however, they may be in a free state by simply interposing them in the form of a disc between the main body and the clamp disk 8. Furthermore, when the sliding sheets 10 and 17 are pasted on the inside of the main body 2, it is not necessarily necessary to provide the sliding sheets on the entire surface; for example, the radial sliding sheets 19 shown in FIG.
Alternatively, an overwound sliding sheet 20 shown in FIG. 7 may be used.

[Effect of idea]

As explained above, the optical disk cassette according to the present invention uses a material with low sliding resistance, such as Teflon, between the main body and the clamp disk, which rotates together with the optical disk housed in the disk cassette case. Since a sliding sheet made of material is interposed, the rotational sliding resistance between the clamp disk and the main body is reduced, and the load on the disk motor is significantly reduced. Further, in the above configuration, since the supporting portion on the back side of the clamp disk is distributed in a planar manner, the supporting state is stabilized and the occurrence of surface runout is prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the optical disk cassette according to the present invention, and FIG.
3 is a cross-sectional view of the main part showing how the optical disk cassette shown in FIG. 1 is set in an optical disk player, and FIGS. 4 and 5 are other embodiments of the optical disk cassette according to the present invention. A cross-sectional view showing an example,
FIGS. 4 and 7 are plan views of sliding sheets showing still other embodiments. 1...Disk cassette case, 2...Main body, 3...
Lid body, 4, 5... Shaft, 6... Optical disk, 7... Center hole, 8... Clamp disk, 10, 17, 18,
19, 20...Sliding sheet, 11...Disc clamper, 12...Claw-shaped body, 13...Opening, 14...Slit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A shaft provided at the center of the main body of a disc cassette case with a lid, a clamp disc attached to this shaft and having a larger diameter than the central hole of the optical disc accommodated; By protruding coaxially from the surface of the clamp disk with respect to the center of rotation, it engages with the center hole of the optical disk, fixing the optical disk in a stacked state on the clamp disk, and also allows the disk to rotate when set in a disk player. A disk clamper that is rotated by engaging with the shaft, an opening for passing the disk rotating shaft provided in a lid portion facing the disk clamper, and an opening provided in a lid portion facing the movement range of the optical head. 1. An optical disk cassette having a slit, characterized in that a sliding sheet with low sliding resistance is interposed between the main body and the clamp disk. (2) The optical disk cassette according to claim 1, wherein the sliding sheet is formed into a plurality of waves along the direction of rotation.