JPH07153171A - Disk cassette - Google Patents

Abstract

PURPOSE:To reduce the dust attracting to an optical disk and to prevent the generation of the spacing between a head and the disk by providing a static elimination brush in a case and releasing the static electricity generated on the optical disk to a disk driving device. CONSTITUTION:The optical disk 1 is floated up from the cases 10a and 10b and brought into contact with the static elimination brush 16. The brush 16 is fixed to an electrically conductive plate 17 and a part of the conductive plate 17 is exposed to the external surface of the case 10a. The conductive plate 17 is exposed to the case 10 and brought into contact with a collector plate of the driving device when the disk cassette 9 is loaded to the driving device. Thus, the potential of the optical disk becomes always the same as that of the disk driving device, then the dust attraction is reduced by the static electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cassette for storing an optical information recording medium such as an optical disc or an optical card, and more particularly to a read-only optical information recording medium such as a CD-ROM in which data cannot be written. The present invention relates to a disc cassette which accommodates an optical information recording medium having a magnetic recording area on a part of a recording surface.

[0002]

2. Description of the Related Art In recent years, a CD-ROM has been widely adopted for data processing of computers. This CD-ROM
Is for playback only and cannot write data to the disc later. Therefore, after processing the data in the disc or during the data processing, the result cannot be written and saved in the disc, and must be written in another writable medium. In addition, at the time of aggregation of the data processing and restart of the data processing,
It is very inconvenient to use because there is a problem that it is necessary to use the other medium.

In order to solve this inconvenience, for example, a composite disk as disclosed in JP-A-60-55526 and JP-A-01-217746 has been proposed. These disks are provided with an optical recording area and a magnetic recording area on a disk substrate, and have a read-only large-capacity optical recording method and a magnetic recording / reproducing method that has a small recording capacity but allows easy recording / reproducing. It is one.

Particularly, FIG. 6 of JP-A-60-55526 describes an example in which a magnetic recording medium portion (magnetic recording area) is provided on the outer peripheral portion of an optical disk substrate.

An example of the above conventional example is shown in FIGS. 6 and 7.
FIG. 6 is an external view of the optical disc. The optical disc 1 has a spindle hole 4 for mounting it in a recording / reproducing apparatus in the center, and a ring-shaped optical recording area 2 having a predetermined width is formed on the outer side thereof. A magnetic recording area 3 for ring-shaped magnetic recording is formed on the outer peripheral portion of the optical disc by overlapping. FIG. 7 shows AA of FIG.
A sectional view is shown. Reference numeral 1 is an optical disk, 8 is a transparent substrate such as polycarbonate or epoxy resin, and 5 is a transparent substrate 8.
A recording layer having concentric or spiral irregularities formed on the reflective layer 6, a reflective layer made of aluminum or the like formed on the recording layer 5, and 7 an ultraviolet curing layer formed on the reflective layer 6 ( The top coat layer 3 made of UV) resin or the like is a magnetic recording region fixed on the top coat layer 7. Burrs 9 are formed on the outer peripheral edge of the magnetic recording area 3 in the entire circumference, and burrs 10 are formed on the inner peripheral edge of the magnetic recording area 3 in the entire circumference.

[0006]

When the magnetic recording area 3 of the optical disk 1 shown in FIG. 6 is slid by a magnetic head (not shown), if the transparent substrate 8 is a plastic material such as polycarbonate or epoxy resin, static electricity will be generated. Then, the optical disc 1 adsorbs the dust, the dust is accumulated between the magnetic head and the magnetic recording area 3, the magnetic head is lifted, and the spacing occurs, which hinders good recording and reproduction.

The object of the present invention is to solve the above problems,
It is an object of the present invention to provide a disk cassette that prevents dust from adhering, has good contact between a magnetic head and a magnetic recording area, does not generate spacing, and can perform good recording and reproduction.

[0008]

Therefore, in the present invention, the optical disk is put in a case, and the case is provided with an antistatic brush made of a conductive material.

[0009]

Since the static elimination brush provided in the case is made of a conductive material, the static electricity generated in the optical disk is released to the disk drive device, and the potential of the optical disk is always kept at the same potential as the disk drive device.

[0010]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view of an embodiment of the disc cassette of the present invention. FIG. 2 is an operation explanatory diagram of FIG. FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a right side view. FIG. 5 is a rear view.

The disc cassette 9 comprises a case 10 containing the optical disc 1, a shutter 11 and a spring 12 for urging the shutter 11. The case 10 has a window 21, a shutter slide portion 15 that is one step lower than the surface of the case is formed, and static elimination brushes 16 and 18 are provided around the window 11 as line objects. The static elimination brushes 16 and 18 are fixed to the conductive plates 17 and 19, and the conductive plates 17 and 19 are fixed to the case. A cover 20 is also fixed to the case 10. Shutter 1
A protrusion is formed on 1 and one end of the spring 12 is locked. The other end of the spring 12 is locked in a recess 14 formed in a corner of the case 10.

FIG. 2 is a diagram for explaining the operation of FIG. 1, in which the shutter 11 receives an external force from the external force receiving portion 27 of the shutter 11.
Shows the state in which the window 21 has been opened by moving. The shutter 11 moves to the shutter slide portion 15, and the spring 12 is flexed.

FIG. 3 is a sectional view taken along the line BB of FIG. 1, showing a rotatable state in which the optical disk 1 is mounted on a drive device (not shown). The case 10 includes an upper case 10a and a lower case 10b. Optical disk 1 is case 10
It floats up from a and the case 10b and does not come into contact with the case 10, but comes into contact with the static elimination brush 16. As described above, the static elimination brush 16 is fixed to the conductive plate 17, the conductive plate 17 is fixed to the case 10a, and a part of the conductive plate 17 is exposed on the outer surface of the case 10a.
A disc clamp disc 22 is rotatably held under the cover 20 at the center of the case 10a. The disc clamp disc 22 is used when the optical disc 1 is chucked on a spindle (not shown) of a drive unit.

FIG. 4 is a right side view of the disc cassette 9. The conductive plate 17 is exposed on the case 10 and comes into contact with a current collector plate (not shown) of the drive device when the disk cassette 9 is mounted on the drive device (not shown). When the static elimination brushes 16 and 18 are used for line objects as shown in FIG. 2, they are in good balance because they contact symmetrically with respect to the optical disk. Further, it is also possible to dispose one position at a position of 180 degrees with respect to the window 21, that is, at a position moved by 90 degrees in the clockwise direction from the position at which the static elimination brush 16 is arranged. In this case, the magnetic head (not shown) inserted in the window 21 can be balanced, so that the arrangement is good.

FIG. 5 is a rear view of the disc cassette 9. Positioning holes 23 and 24 are formed in the case 10b. The shutter 11 is long, and the lower portion of the shutter 11 is covered by a shutter stopper 25 so that the shutter 11 is not vertically covered by the case 10b.

[0017]

As described above, according to the present invention, the case is provided with the static eliminator brush made of a conductive material, and the static electricity generated in the optical disk is released to the disk drive device so that the potential of the optical disk is always maintained. Since the electric potential is the same as that of the above, the adsorption of dust to the optical disk due to static electricity is reduced, and as a result, the spacing between the head and the disk is reduced, and good recording / reproducing characteristics can be secured.

[Brief description of drawings]

FIG. 1 is a front view of a disc cassette according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a right side view of FIG.

5 is a back view of FIG. 1. FIG.

FIG. 6 is an external perspective view of an optical disc used in the disc cassette according to the first embodiment of the present invention.

7 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical recording area, 3 ... Magnetic recording area, 4 ... Spindle hole, 8 ... Transparent substrate, 9 ... Disk cassette, 16, 18 ... Static elimination brush 17, 19 ... Conductive plate

Claims (1)

[Claims] 1. A disc on which information is recorded, a case for holding the disc in a rotatable state, and a brush of a conductor between the case and the disc inside the case. A disc cassette characterized by being fixedly arranged.