JPH0273584A - Disk cartridge - Google Patents

Abstract

PURPOSE:To house a disk without contacting the inside surface of a cartridge with the recording part of a disk by providing a step part inside the circumferential part of a disk housing part and a wall part higher than the step part in the vicinity of a central part. CONSTITUTION:A step part 5 is provided on an inside surface 4 along the inside of a circular-shaped inside wall 2, a semi-arc-shaped wall part 6 higher than a wall part 5 is provided around an opening part 3, and when a disk D is housed, a recording part Db is avoided to contact with the inside surface 4 only by allowing the wall part 6 to contact with the non-recording part Da of the inner circumferential part of the disk D. Even when a shock from an outside is given to an upper case 1b and the upper case 1b itself is distorted, an angle is formed by the disk D and the inside surface 4, only the collision of a non-recording part Dc of the end part of the disk D is generated and the disk D is hardly flawed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc cartridge that is made into a cassette so that it can be installed in a drive device while housing a disc-shaped recording medium.

[Prior Art] In recent years, optical discs have been used as information recording media in the field of information and data management. An optical disc has a recording surface on its surface, and both sides are covered with a protective coating.
Since optical signals such as laser beams are used to read information from the recording surface of the disk, if scratches, dust, dirt, etc. adhere to the protective coating surface, it becomes impossible to read the information. Therefore, one idea is to store the disc in a case, but it is inconvenient to take it out of the case every time it is used, and since it is touched directly by children, scratches, dust, dirt, etc. may adhere to it. In order to prevent this, disc cartridges with a shutter mechanism are currently used, which allow the disc to be used without having to take the disc in or out.

[Problems to be Solved by the Invention] However, in the conventional example described above, since the optical disc rotates while being housed in the disc cartridge, it is necessary to take into account the eccentricity of the disc and the rotating part of the recording/reproducing device. ,
The inner wall dimensions of the disc storage area must be sufficiently larger than the outer diameter of the disc. Also, when transporting the cartridge, the disc may slide against the inner surface of the cartridge, causing damage to the disc or damaging the disc and cartridge. There is a risk that shavings may be generated and the information may become unreadable.

As a way to solve this problem, a step is provided around the inner surface of the disk storage compartment at a position that contacts only the inner circumference and edge of the disk, which is the non-recording area, so that the disk floats above the inner surface of the cartridge. One possible method is to hold it in place. However, if the steps on the inner and outer peripheries are made the same height,
Since the disc is held parallel to the inner surface, there is a risk that the stepped portion of the outer periphery and the outer periphery of the disc will come into sliding contact, causing damage to the disc and making it impossible to read the information recorded on the outer periphery.

[Object of the Invention] An object of the present invention is to eliminate the above-mentioned drawbacks, to provide a disk cartridge that can accommodate a disk without the inner surface of the cartridge coming into contact with the recording portion of the disk, has a simplified internal structure, and can be manufactured at low cost. It's about doing.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide a disk cartridge for storing a disk-shaped recording medium having a non-recording portion on the inner circumference, in which a step is provided on the inner side of the outer circumference of the circular disk storage portion. The disk cartridge is characterized in that a wall portion is formed near the center of the disk storage portion, and the wall portion is higher than the step portion.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a simplified exploded perspective view of a disk cartridge, in which a lower case 1a and an upper case 1b of substantially the same shape are glued or screwed together with an optical disk D sandwiched therebetween, and the case is stored inside a circular inner wall 2. A disk D is stored in the section. Note that the lower case 1a and the upper case 1b are provided with openings 3 for recording and reading information on the disc D. In addition, an inner surface 4 along the inside of the circular inner wall 2
A step 5 is provided on the top, a semi-arc shaped wall 6 is provided around the opening 3, and the wall 6 is higher than the step 5.

FIGS. 2 and 3 are cross-sectional views of the disk D stored, FIG. 82 is a normal state, FIG. 3 is a state in which a shock is applied, and FIG. 4 is an enlarged cross-sectional view of a corner of the upper case lb. It is. In FIG. 2, the wall 6 is a non-recording area D on the inner circumference of the disk D.
It is only in contact with a, and in the normal state, the recording part ob
indicates that the inner surface 4 does not touch.

As shown in Figure 3, when an external impact is applied to the scratch on the upper case 1, the upper case lb itself is distorted, and at the same time, the disk D
will also become distorted momentarily. Therefore, it is conceivable that the inner surface 4 and the non-recorded portion Dc at the end of the disk D collide and the surface of the disk D is damaged. By surrounding the disk D
and the inner surface 4 have an angle, and as shown in FIG. 4, the collision is limited to only the non-recorded portion Dc at the edge of the disk D.

[Effects of the Invention] As explained above, the disc cartridge according to the present invention has a stepped portion inside the outer periphery of the disc storage portion and a wall portion higher than the stepped portion near the center, so that recording of the disc is always possible. It becomes possible to store the disc without the inner surface of the cartridge coming into contact with the inner surface of the cartridge, which has the effect of making it difficult to damage the disc.

[Brief explanation of the drawing]

The drawings show an embodiment of a disk cartridge according to the present invention; FIG. 1 is an exploded perspective view, FIGS. 2 and 3 are sectional views of the cartridge, and FIG. 4 is a partially enlarged sectional view. 1a is a lower case, 1b is an upper case, 2 is an inner wall, 3 is an opening, 4 is an inner surface, 5 is a step, and 6 is a wall. Patent applicant: Canon Co., Ltd. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a disk cartridge that stores a disk-shaped recording medium having a non-recorded portion on the inner circumference, a step is provided around the inner outer circumference of a circular disk storage portion, and a wall portion is provided near the center of the disk storage portion. A disk cartridge characterized in that the wall portion is higher than the stepped portion.