JPH03178087A - Optical disk cartridge - Google Patents

Abstract

PURPOSE:To prevent dust or trash from being adsorbed to an optical disk by mounting a conductive mat on the internal surface of a main body to house the optical disk. CONSTITUTION:In the recessed part on the internal surface of a main body 2 surrounded by circular and ringular step parts 2e 2f, a thin and disk-shaped conductive mat 4 is mounted at a height lower than that of the step parts 2e and 2f where a rectangular opening 4 is formed. On the internal surface of one guide hole 2d, a conductive layer 5 is formed and a positioning pin 6 is formed by metal as a satisfactory conductor so as to fit a point connecting the conductive mat 4 and the guide hole 2d, where the conductive layer 5 is formed, and this pin is connected to a ground line 7. The conductive mat 4 connected with the ground line 7 discharges a potential, which is charged on an optical disk 1, by corona discharge. Thus, the dust or trash is not adsorbed on the surface of the optical disk and the reliability of an optical disk cartridge is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical disc cartridge that houses an optical disc that optically or magneto-optically records and reproduces data such as digital signals, audio, and images. .

(Prior Art) In recent years, optical discs have entered the industrial world at a remarkable pace, and are beginning to be used not only for images and sounds, but also as data recording devices for computers.

Under these circumstances, as a means of improving the reliability of optical discs, the use of optical disc cartridges that house optical discs has become mainstream.

A conventional optical disk cartridge of this type will be explained with reference to FIGS. 7 and 8.

7 and 8 are a perspective view and a sectional view of the optical disc cartridge.

In FIG. 7, the optical disc cartridge consists of an optical disc l (drawn with broken lines in the diagram), a rectangular main body 2 that houses the optical disc, and a circular drive opening 2a formed on both the front and back sides of the center and front sides of the optical disc l. and a U-shaped sheet metal door 3 that covers the rectangular opening 2b and is slidably attached to a guide 2c provided perpendicular to the rectangular opening 2b.
It is composed of. The main body 2 is provided with guide holes 2d on both sides opposite to the rectangular opening 2b, which pass through the front and back sides to determine the mounting position. Further, as shown in FIG. 8, circular and annular stepped portions 2e and 2f are formed on the inner surface of the main body 2 so that the optical disk drive can be held horizontally at both the inner and outer peripheral edges, avoiding the recording area. has been done.

The operation of the optical disc cartridge configured as described above will be explained.

When the optical disc cartridge is inserted into the recording/playback device, it is installed in the recording/playback position by the guide hole 2d, and at the same time, the door 3 is automatically slid along the guide 2c, and the circular opening 2a and the rectangular opening are opened. 2b are exposed together. Subsequently, a drive shaft connected to an optical disc drive motor is inserted through the circular opening 2a and fixed by a clamp device, at the same time lifting the optical disc from the circular and annular step portions 2e and 2f.

The recording/reproducing head is placed closely above the rectangular opening 2b and records/reproduces data.

(Problems to be Solved by the Invention) However, with the above configuration, friction between the main body 2, friction between the main body 2 and the optical disc l, or the optical disc when transporting the optical disc cartridge or loading it into a recording/reproducing device There is a problem in that the optical disk 1 becomes charged due to friction with the air when it rotates, sudden changes in temperature and humidity, etc., attracts dirt and dust, and blocks the recording and reproducing light, making it impossible to record and reproduce. Ta.

The present invention solves the above problems and provides an optical disc cartridge in which the optical disc is not charged.

(Means for Solving the Problems) In order to solve the above problems, the present invention attaches a conductive mat to the inner surface of the main body 2 or the inner surface of the door 3 that houses the optical disk.

(Function) With the above configuration, the electrical charge on the optical disc 1 is removed by the corona discharge induced between the optical disc 1 and the conductive mat, so that dirt and dust are not attracted to the optical disc 1.

(Embodiments) Four embodiments of the present invention will be described with reference to FIGS. 1 to 6.

1 and 2 are a sectional view and a half-exploded perspective view of an optical disc cartridge showing a first embodiment of the present invention.

In FIG. 1, this embodiment differs from the conventional example shown in FIG. A disk-shaped conductive mat 4 thinner than the height of the step portions 2e and 2f is attached, and a conductive layer 5 is formed on the inner surface of one of the guide holes 2d and connected to the conductive mat 4. The positioning pin 6 that fits into the guide hole 2d in which the conductive layer 5 is formed is formed of a metal with good electrical conductivity, and is connected to the ground wire 7. Since the rest is the same as the conventional example, the same components are given the same reference numerals and their explanations will be omitted. Furthermore, the operation when the optical disk cartridge configured as described above is installed in a recording/playback device is the same as in the conventional example, so a description thereof will be omitted, but the main body 2
The conductive mat 4 attached to the inner surface of the optical disc 1 and connected to the ground wire 7 eliminates the electric potential charged on the optical disc 1 by corona discharge, so that the optical disc 1 does not attract dirt or dust.

3 and 4 are a sectional view and a perspective view of the door of the second embodiment of the present invention, and this embodiment is different from the first embodiment shown in FIGS. 1 and 2. The difference is that instead of the conductive mat 4 attached to the inner surface of the main body 2, the conductive mat 4 is inserted into the rectangular opening 2b of the main body 2, and the circular and annular stepped portion 2e is inserted into the rectangular opening 2b of the main body 2.
A strip-shaped conductive mat 8 that stops at a position slightly lower than 2f is fixed to the inner surface of the sheet metal door 3, and the conductive layer 5 of the guide hole 2d and the door 3 are electrically connected (Fig. (not shown). Since the rest is the same as the first embodiment, the same components are given the same reference numerals and the explanation thereof will be omitted. Further, the operation when the optical disk cartridge is mounted on the recording/reproducing apparatus and the operation when the charged potential of the optical disk 1 is removed are the same as those in the first embodiment, and therefore their explanations will be omitted. In the first embodiment, the conductive layer 5 and the positioning pins 6 were used to ground the conductive mat 4, but even if the grounding is done by putting or coating an antistatic agent on the main body 2, it will take a long time. .

5 and 6 are cross-sectional views of conductive mats 9 and 10 according to third and fourth embodiments of the present invention, which differ from the first embodiment shown in FIGS. 1 and 2. is the first
The conductive mat 4 of Example 3 was in the form of a sheet, but the conductive mat 4 of Example 3 was
The second embodiment uses a brush-like conductive mat 9, and the fourth embodiment uses a needle-like conductive mat IO having conical needles formed on one surface. The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted.

(Effects of the Invention) As explained above, according to the present invention, the electrical charge on the optical disc is removed by the conductive mat placed very close to the optical disc, so that the optical disc attracts dirt and dust to its surface. This improves the reliability of the optical disc.

[Brief explanation of drawings]

1 and 2 are cross-sectional views and biodegradable perspective views of an optical disk cartridge showing a first embodiment of the present invention, and FIGS. 3 and 4 are optical disk cartridges showing a second embodiment of the present invention. Sectional view and perspective view of its door, No. 5
6 and 6 are cross-sectional views of the conductive mats of the third and fourth embodiments, and FIGS. 7 and 8 are perspective views and cross-sectional views of conventional optical disk cartridges. 1...Optical disc, 2...Main body, 2a...
Circular opening, 2b, 4a... Rectangular opening, 2c... Guide, 2d... Guide hole, 2a circular step, 2f...
Annular step, 3...door, 4゜8゜9.10 Conductive mat, conductive layer, positioning pin. ground wire.

Claims (5)

[Claims] (1) An optical disc cartridge characterized in that a conductive mat is attached to the inner surface of a cartridge body that houses an optical disc made of a resin substrate. (2) An optical disc cartridge characterized in that a conductive mat is fixed to the inner surface of a door provided on the cartridge housing an optical disc made of a resin substrate. (3) The optical disc cartridge according to claim (1) or (2), wherein the optical disc and the conductive mat are arranged close to each other in a non-contact state. (4) Claim (1) or (4) characterized in that the shape of the optical disc side of the conductive mat is formed into a brush shape.
2) The optical disc cartridge described above. (5) Claim (1) or (1) characterized in that the surface shape of the optical disc side of the conductive mat is formed into a needle shape.
2) The optical disc cartridge described above.