JPH07176166A - Cartridge type optical disk - Google Patents

Abstract

PURPOSE:To facilitate assembly and inspection by providing a discrimination part by which the front and rear surfaces of an optical disk is discriminated on the optical disk housed in a cartridge and set at a position where it can be visualized from the aperture part of the cartridge. CONSTITUTION:Since discrimination marks A and B for the front and the back surfaces are put on the optical disk 4 when the cartridge 1 is assembled, the cartridge 1 can be easily and precisely assembled by inserting the optical disk 4 according to the discrimination marks A and B shown on the upper and the lower cases 1A and 1B of the cartridge 1. Besides, when the cartridge is inserted in an optical disk device, an A/B surface detection switch 7 is turned on/off according to whether an A/B surface detection hole 6 exists or not so that the A/B surfaces can be detected by a control part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a format in which the front surface and the back surface are different (for example, front surface A is right-handed and back surface B is left-handed).
The present invention relates to a cartridge type optical disc device in which a double-sided recordable / reproducible optical disc having the following tracks is housed in a cartridge, and the cartridge has a front surface / back surface identifying portion.

[0002]

2. Description of the Related Art A general double-sided recordable / reproducible optical disk has the same format on both the front and back surfaces, and when recording / reproducing on the front and back surfaces, the cartridge containing the optical disk is reversely converted into a disk drive. I was doing.

In this case, it is not necessary to reversely rotate the spindle motor that rotates the optical disk, and it is not necessary to distinguish the front surface from the back surface when nothing is recorded at the time of manufacturing the optical disk cartridge.

However, recently, a double-sided recordable and reproducible optical disk having tracks of different formats on the front surface and the back surface is housed in a cartridge,
A cartridge type optical disk device having a back surface identification portion has been proposed.

[0005]

In the above-mentioned recent cartridge type optical disk device, it is necessary to discriminate the spiral direction of the track and switch the rotation direction of the spindle motor for rotating the optical disk to perform the reproduction / recording.

By the way, when manufacturing such a recent cartridge type optical disk device, if the optical disk is housed in a cartridge and assembled, the front surface / back surface of the cartridge must be assembled so as to correspond to the front surface / back surface of the optical disk.
It will interfere with the recording. In particular, the track pitch of an optical disk is very fine, for example, 1 to 2 μm, and it is difficult to discriminate its format with the naked eye.

In view of the above points, an object of the present invention is to make it possible to easily determine the correspondence between the front surface and the back surface of a cartridge and an optical disk and to accurately and easily assemble the cartridge.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a cartridge type optical disc apparatus in which a double-sided recordable / reproducible optical disc having front and back surfaces having different formats is housed in a cartridge, and the cartridge has a front / back surface identifying portion. The optical disk housed in the cartridge is provided with an identification portion for identifying the front surface / back surface of the optical disk on the optical disk at a position visible from the opening of the cartridge.

[0009]

According to the present invention, when the cartridge is assembled, the identification portion is provided on the optical disk at a position corresponding to the front surface / back surface of the optical disk, which is easily visible from the opening of the cartridge. The front / back side can be identified,
It can be assembled while it is properly stored in the cartridge.

[0010]

1 shows an exploded perspective view of an embodiment of the present invention, in which a cartridge 1 is composed of an upper case 1A and a lower case 1B, and openings 2A and 2B are formed in both upper and lower cases,
Both upper and lower cases are screwed and fixed by screws 3. Then, an identification mark A / B for distinguishing the front surface / back surface of the cartridge (in the drawing, the front surface identification mark A is shown as an example in the upper case 1A) is provided in the vicinity of the openings 2A, 2B.

An identification mark A / B (a front side identification mark A is shown in the drawing has a hub 40 at the center of rotation of the optical disc 4 housed in the cartridge 1 for distinguishing between the front surface and the back surface of the optical disc 4. Is attached near the hub 40. An enlarged plan view of this portion is shown in FIG.

The shutter 5 is inserted in the direction of the arrow indicated by the alternate long and short dash line to cover the openings 2A and 2B and prevents dust from entering from the outside.

FIG. 3 is a perspective view showing the external appearance of the cartridge 1 shown in FIG. In the figure, 6 is an A / B surface detection hole formed in the cartridge 1, and 7 is an A / B surface detection switch, which is used when the cartridge is inserted into the optical disk device.
The presence / absence of the B-side detection hole 6 turns on / off the A / B-side detection switch 7 so that the control unit (not shown) can detect the A / B-side.

According to the present invention, when the cartridge 1 is assembled as shown in FIGS. 1 to 3, the optical disk 4 is provided with front / back surface identification marks A / B. 1 can be inserted corresponding to the front / back identification marks A / B shown on the upper and lower cases 1A and 1B, and can be assembled easily and accurately.

When a cartridge is used, the front surface / back surface can be discriminated at a glance from the openings 2A / 2B, so there is no risk of erroneous operation. Moreover, the control section is correctly operated by the A / B surface detection switch 7 of the A / B surface detection hole 6.

FIG. 4 shows each example of attachment of the identification marks A / B. (1) is the same attachment example as in FIG. 1, (2) is an example attached to the hub 40, and (3) and (4) are , Which is an example in which the color of the hub 40 is changed between the front surface and the back surface, and is a plan view showing a state where the optical disk 4 is housed in the upper and lower cases 1A and 1B.

In the above identification mark, the front surface / rear surface is represented by A / B. However, the identification mark may be attached to other symbols or numbers, or only one side. Each of these examples is shown in the table below.

[0018]

[Table 1]

[0019]

As described above, since the cartridge type disc of the present invention is provided with the identification mark capable of distinguishing the front surface / the back surface from the outside, the front surface / the back surface of the optical disk can be discriminated and the special The optical disk cartridge can be easily and accurately assembled without requiring a device.

Moreover, when the shutter is opened, the surface / surface of the cartridge is always seen from the openings of the upper and lower cases.
Since the identification mark on the back side is known, it is possible to easily inspect whether the front side / back side is correct even after assembly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged plan view of identification mark positions showing the front surface / back surface of FIG.

FIG. 3 is a perspective view showing an external appearance of the cartridge of FIG.

FIG. 4 is a diagram showing each example of attachment of identification marks A / B.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cartridge, 1A ... Upper case, 1B ... Lower case, 2A, 2B ... Opening part, 3 ... Screw, 4 ... Optical disk, 5 ... Shutter, 6 ... A / B surface detection hole, 7
... A / B side detection switch, 40 ... Hub, A, B ... Identification mark.

Claims (1)

[Claims] 1. A cartridge-type optical disk device having a cartridge, which has a front surface / back surface discriminating section, in which a double-sided recordable / reproducible optical disk having tracks of different formats on the front surface and the back surface is housed in the cartridge. On the surface /
A cartridge type optical disc, wherein an identification portion capable of identifying the back surface is provided on the optical disc at a position visible from the opening of the cartridge.