JPH03266274A - Cartridge for disk - Google Patents

Abstract

PURPOSE:To precisely record and reproduce information extending over a long period of time by forming a sliding part made of the material of a small friction coefficient at a rib. CONSTITUTION:A cartridge is provided with a reactangular case 1 to store rotatably an optical disk 11, opening part 2 formed on both sides of the case 1, and the ribs 3 protruding inside from the edge parts of the opening parts 2. Then, the sliding members 4 made of 'Teflon(R)' of the small friction coefficient are formed at the tip part of the ribs 3. Accordingly, since the sliding part 4 made of the material of the small friction coefficient is formed at the rib 3, the generation of abrasion dust can be suppressed even if the disk 11 during rotation slides on the rib 3. Thus, even if the optical disk 11 slides on the rib 3, the information can precisely be recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge for accommodating disks such as optical disks and magneto-optical disks.

[Prior Art and Problems to be Solved by the Invention] Optical discs, especially double-sided optical discs that can record and reproduce information on both sides, are known as optical recording media that can record information at high density and are highly reliable. This double-sided optical disc is rotatably housed in a cartridge, and information is recorded and reproduced thereon.

FIG. 5 is a schematic cross-sectional view showing a conventional optical disc cartridge.

The double-sided optical disc (31) has a clamping hub (32) attached to its center, and a hub (32) attached to the center of the disc.
) has a center hole (33) formed in the center of the hole (33). The cartridge includes a case (34) that rotatably accommodates an optical disc (31), an opening (35) formed at the center of both sides of the case (34), and an edge of the opening of the case (32). It has a tariff (36〉).

The opening (35) of the case (34) can be opened and closed by a shutter (37).

Further, a positioning hole (38) is formed in the case (34).

An optical disc (31
) is rotated as follows. That is, the case (34) is lowered by the vertical movement mechanism of the drive, and the spindle (39) is set on the hub (32).

The center pin (40) is inserted into the center hole (3) of the hub (32).
3), the positioning pin (41) is inserted into the positioning hole (38). The optical disc (31) released from the rib (36) within the case (34) is rotated by moving the shutter (37) using the shutter opening/closing mechanism to open the opening (35) and rotating the spindle (39). It is driven to record and reproduce information.

However, in a cartridge having such a structure, the accuracy of recording and reproducing information deteriorates. That is, in a drive mechanism of the type in which, after recording and reproducing information, the case (34) is raised by the vertical movement mechanism and the cartridge is removed before the rotation of the optical disc (31) has completely stopped. Optical disk (3) rotating due to inertia
1) comes into sliding contact with the rib (36). Further, due to the sliding contact, the optical disk (31) or the rib (36) is worn, and wear particles are generated. On the other hand, when recording and reproducing information using laser light, a spot beam of laser light is irradiated to record information as a pit train or the like, and the recorded information is reproduced based on changes in the amount of reflected or transmitted light of the laser light. When the abrasion powder adheres to the optical disk (31), it becomes difficult to record and reproduce information with high accuracy.

Problems like the second one are not limited to horizontal type drive mechanisms that move the cartridge vertically to install and remove it.
This problem also occurs in vertical drive mechanisms that move the cartridge laterally to install and remove it.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc cartridge that can accurately record and reproduce information even when the optical disc and the rib come into sliding contact.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a case rotatably housing a disk, an opening formed in the case that can be opened and closed, and an edge of the opening of the case. To provide a disk cartridge having a rib formed on a portion thereof, the rib having a sliding contact portion made of a material having a small coefficient of friction.

[Function] According to the present invention having the above configuration, since the sliding contact portion made of a material with a small coefficient of friction is formed on the rib, even if the rotating disk comes into sliding contact with the rib, generation of abrasion powder is suppressed. can.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Fig. 1 (^) (B) is a schematic sectional view of a disc cartridge showing an embodiment of the present invention, Fig. 2 is a sectional view of essential parts of the disc cartridge shown in Fig. 1, and Fig. 3 is a disc cartridge. It is a partially cutaway schematic perspective view showing.

The cartridge includes a rectangular case (1) that rotatably accommodates an optical disc (11), an opening (2) formed on both sides of the case (1), and an opening (2) in the case (1).
2) and a rib (3) projecting inward from the edge.

A sliding contact member (4) made of Teflon with a small coefficient of friction is provided at the tip of the rib (3). In this example, as shown in FIG. 2, the rib (3) and the sliding member (
4), a sliding contact member (4) with an H-shaped cross section is used.
) is partially embedded in the rib (3), and the sliding contact member (4) is exposed on the surface of the rib (3).

Also, when recording and playing back information, the optical disc (
Case (1) 9 opening (2) to expose It)
can be opened and closed by a shutter (5). More specifically, as shown in FIG. 3, a slider (not shown) slidably disposed in a guide groove (6) at the end of the case (1) has a Shutters (5) are attached to cover the openings (2) on both sides. The slider is pressed to one side by an elastic member (not shown) such as a spring disposed within the case (1). The slider is also formed with a slot (force) that removably engages with the shutter opening pin (not shown) of the drive mechanism (not shown). By reciprocating, the shutter (5) reciprocates and opens and closes the opening (2) of the case (1).

Positioning holes (8) are formed on both sides of the case (1) for positioning the cartridge.

A double-sided optical disc (
11) is the hub for the clamp (
12), and six inner holes (13) formed in the center of the hub (12).

On the other hand, the drive mechanism is normally rotatable and has a center pin (14) inserted into the center hole (13) of the hub (12) and a magnet (15) that magnetically attracts the hub (12). It is equipped with a spindle (1B).

The drive mechanism usually has a positioning pin (17) inserted into the positioning hole (8) of the case (1).

In such a cartridge, as shown in FIG. 1(A), the cartridge is moved by the vertical movement mechanism of the horizontal type drive, and the hub (12) is magnetically moved by the magnet (15) of the spindle (16). The spindle (16) is set on the hub (12) by attracting the spindle (16) to the hub (12). The center bin (14) is a hub (12)
The positioning pin (17) is inserted into the positioning hole (8). In the cartridge attached to the drive mechanism, the shutter (5) is moved by the shutter opening/closing mechanism to open the opening (2) of the case (1), and by rotating the spindle (1B), the rib (3) is removed. Place the free optical disc (11) in the case (
1), and information can be recorded and reproduced on both sides of the optical disc (11) using laser light.

In a type of drive mechanism in which the cartridge is attached or detached before the rotation of the optical disk (11) has completely stopped, after the recording and reproduction of information is completed, the case (1) is raised by the vertical movement mechanism, and the cartridge is attached or detached. If you do this, the first
As shown in Figure (B), the rotating optical disk (11) comes into sliding contact with the rib (3) due to rotational inertia. However, since the sliding contact member (4) with a small friction coefficient is provided at the tip of the rib (3), the optical disk (11)
) does not wear out and no wear debris is generated. In particular, since the H-shaped sliding contact member (4) is partially embedded in the rib (3), it has great integrity with the rib (3) due to the anchor effect.

Therefore, even when information is repeatedly recorded or reproduced on the optical disc (11) over a long period of time, the information can be recorded and reproduced with high accuracy.

In the above embodiment, the cartridge is mounted and removed by moving it vertically using a horizontal drive mechanism, but the cartridge is mounted and removed by moving it horizontally using a vertical drive mechanism. It's okay.

In the cartridge shown in FIGS. 1 to 3, the sliding member embedded in the rib (3) is not limited to the H-shape, but may be flat, curved, or the like. When partially embedding a sliding contact member in a rib, in order to firmly integrate the sliding contact member with the rib, it is recommended to use a sliding contact member with a large diameter in the buried part or an engaging part with an uneven shape in the buried part. It is preferable to use a sliding contact member having the following.

FIG. 4 is a sectional view of a main part showing another embodiment of the present invention.

Note that the same elements as those in the above embodiment will be described with the same reference numerals.

In this example, the rib (23) that contacts the optical disc (11)
) is formed of a coating layer made of a material with a small coefficient of friction. The sliding contact part (2
4) can be easily formed by coating the rib (23) with a material having a small coefficient of friction.

In each of the embodiments described above, it is sufficient that a sliding contact portion made of a material with a small coefficient of friction exists on the surface of the rib. Although the sliding contact portion may be made of plastic or the like containing a material with a small coefficient of friction, it is preferably made of a material with a small coefficient of friction. Such materials may be, for example, silicone resins, polyolefins, etc., but fluorine-containing polymers are preferred. Moreover, it is preferable that the above-mentioned material is hard.

In each of the above embodiments, the optical disk is rotated by the magnetic attraction force of the magnet in the drive system, but in order to mechanically engage the optical disk and drive the optical disk to rotate, a plurality of pins of the drive system are attached to the hub body. A plurality of engagement holes or four parts for insertion may be formed.

The present invention is applicable not only to discs on which information can be recorded and reproduced on both sides, but also to single-sided discs.

[Effects of the Invention] As described above, according to the disc cartridge of the present invention, since the sliding contact portion made of a material with a small coefficient of friction is formed on the rib, even if the optical disc and the rib come into sliding contact, it will not last for a long time. Information can be recorded and reproduced with high accuracy over a period of time.

[Brief explanation of drawings]

1(A) and 1(B) are schematic cross-sectional views of a disk cartridge showing one embodiment of the present invention, and FIG.
3 is a partially cutaway schematic perspective view showing the disc cartridge; FIG. 4 is a sectional view of the main part showing another embodiment of the present invention; FIG. FIG. 2 is a schematic cross-sectional view showing a conventional optical disc cartridge. (1)...Case, (2)...Opening, (3)(2
3)...Rib, (4)...Sliding contact member, (11)...
・Optical disc, (24)...Sliding contact department applicant Daicel Chemical Industries, Ltd.

Claims (1)

[Claims] A cartridge having a case rotatably housing a disk, an opening formed in the case that can be opened and closed, and a rib formed at the edge of the opening of the case, the rib having a coefficient of friction. A disc cartridge characterized in that a sliding contact portion made of a small material is formed.