JP3024649B2 - Disc cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge, a disk cassette or a disk half containing a disk-shaped recording medium such as an optical disk.

2. Description of the Related Art A compact disk (hereinafter, referred to as CD) system, which is standardized as a red book, a yellow book and the like and records information on a disk having a diameter of 120 mm, is widely used mainly for music. Although this system has a tentative capacity for handling music information, when recording video information such as a CD-ROM, the amount of information increases, resulting in a shortage of capacity. The decline was inevitable. As a movement to cope with this, for example, a digital video disk (hereinafter, referred to as a DVD) system that is being standardized is cited.

The problem to be solved by the present invention is to increase the capacity of a CD system or a disk system having substantially the same dimensions as the CD system. The concept and technical problems of a new disk cartridge for this are as follows. is there. 1) In order to prevent scratches, dust and dirt due to high-density recording, the state in which a disc is placed in a case is standard. Even in a CD system, there is a case of a CD caddy having a length of about 135 mm, a width of about 125 mm, and a thickness of about 8 mm, but at present, a so-called tray loading method in which the CD caddy is not used is mainly used. 2) Double-sided recording: CD is single-sided. Double the capacity even with simple calculations. 3) Enablement of compatible reproduction of CDs: A point that a disk device using a new disk cartridge can also perform compatible reproduction of a current CD is a selling point. Therefore, it is an essential condition that a disc can be inserted and removed and a disc for a CD system can be built in. However, the above-mentioned CD caddy is a single-sided recording, and a disk clamper is attached to the case side of the caddy, whereas the new disk cassette is a double-sided recording method, so that the clamper is provided on the disk device side. Become. Therefore, when the CD caddy is mounted on the disk device of the new disk cartridge, 2
Two clampers interfere with each other. Therefore, it is necessary to prevent the CD caddy from being mounted on the disk device of the new disk cartridge. 4) Realization at low price: In order to respond to the price for general household use, a low cost configuration including its disk device is adopted. An object of the present invention is to solve the above-mentioned problems and to provide a disk cartridge suitable for a large-capacity CD.

In order to solve the above problems, the present invention has the following arrangement. That is, a first disk cartridge that can be distinguished from a second disk cartridge, wherein the second disk cartridge records information on both disk surfaces and / or reproduces information from both disk surfaces. A second case having a second disc, a second case having a quadrangular shape, accommodating the second disc, and having a second window for exposing a part of the second disc to the outside; A second shutter that is slidably mounted on the second case and that opens and closes the second window, wherein the outer surface of the second case has a positional relationship perpendicular to the disk surface of the second disk. A second reduction portion is provided at both ends of the second shutter in a sliding direction on a second orthogonal plane along which the second shutter slides, and the second reduction portion is provided. Department ,
The second disk is provided so as to be symmetrical with respect to each other on the orthogonal plane, and has substantially the same diameter as the second disk, and records information on both disk surfaces and / or both disk surfaces. A first disk from which information is reproduced, and a first window which has the same shape as the second case and accommodates the first disk and exposes a part of the first disk to the outside. A first case, and a first shutter slidably mounted on the first case to open and close the first window. The first shutter has a positional relationship orthogonal to the disk surface of the disk, and the first orthogonal surface on which the first shutter slides has only one of two ends in the sliding direction of the first shutter. A first reduction section in the form of a reduction letter is provided, Reduction unit is the second of the first disk cartridge only one reduction portion is a relation of being formed in said first orthogonal plane.

The structure of the means operates as follows. 1) Different types of cartridges having substantially the same diameter can be discriminated. 2) It is possible to avoid interference between the clampers of both the device and the CD caddy. 3) When the cartridge is mounted on the apparatus, the discrimination can be performed at the operation stage of inserting the cartridge in parallel with the disk surface. 4) For double-sided recording, even if the cartridge is inserted upside down into the apparatus, the discriminating means on the apparatus can be discriminated with one set.

FIG. 1 to FIG. 6 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 2 shows a disk cartridge of the present invention. (A) is a plan view with a part thereof cut away,
(B), (c), and (d) are side sectional views from below, right side, and top, respectively. The basic configuration of the disc cartridge 100 of the present invention is as follows.
And cases 2 and 3 for accommodating the disc, and a window 2 of the case
a, a shutter 4 for opening and closing the shutter 3a, two springs 40, 41 for urging the shutter 4, and a door 5 for opening a part of the case. The disc 1 can record and reproduce signals on both sides thereof. The cases 2 and 3 are formed by being divided into two pieces, and are attached. Windows 2 for exposing a part of the disk surface so that information can be recorded and reproduced.
a and 3a are formed. Disc 1 and springs 40, 4
The partition walls 2p and 3p for dust prevention are formed between the partition walls 1 and 2. The shutter 4 includes shutter surfaces 4a and 4b corresponding to both surfaces of the disk and a side surface portion 4 for integrally connecting the two.
and c, are integrally formed in a U-shape. And
The projections 4p and 4q are engaged with a guide groove 2g formed linearly in the case, and are mounted so as to be linearly slidable in the left-right direction in the figure. Two springs 40, 41
Is a torsion coil spring, in a stretched state,
The shutter surfaces 4a and 4b of the shutter 4 are the windows 2 respectively.
a and 3a are urged to be held in the closed position. Further, the two springs have the same shape, so that the number of component types is not increased, and cost is reduced. And
One is attached to each of two corner areas 50 and 51 between the two cases 2 and 3 and sandwiching the shutter 4 on the left and right. The tip of each spring arm is
Each end 40a, 41a is bent at a right angle in the axial direction of the winding of the coil portion, and each end 40a, 41a
d, 3d. In addition, each other end 40b, 41
b is engaged with stoppers 3p and 3q formed on the case 3 and having a V-shaped cross section (see also FIG. 1A), and the spring is in a stretched state as described above. It is positioned with high precision in the up, down, left and right directions. According to the present invention, the torsion coil spring has a configuration in which both ends are directly engaged with the case without any intervening other components, and does not increase the number of components. The deepest portions of the groove portions of the hook portions 4d and 4e formed integrally with the shutter 4 are aligned with the above-mentioned vertical and horizontal positions and shifted in height in the thickness direction of the disk. As a result, the shutter 4 is held at the center of the drawing in the left and right directions in the drawing, that is, in the sliding direction. The side surfaces of the cases 2 and 3 viewed from the direction shown in FIG. 2 (b) are open, so that the two springs can be inserted and assembled at once from one direction with the two springs bent. Is very good. The door 5 is rotatably engaged with the case 2 at 5a and 5b, and is opened so that the disk can be taken in and out as shown by dotted lines 5c and 1a. Here, since the door 5 has a surface that is parallel to the disk surface and is opened, the visibility of the disk when the door 5 is opened and the accessibility of the disk are good. Note that the door 5 may be configured to open the side surface of the case, like a currently commercially available 8 cm CD-ROM cartridge. If the user does not want to take out a disc such as a rental disc, the door 5 need not be provided. Next, the operation when the shutter opens and closes the window is shown in FIGS.
In FIG. 1, the disk cartridge 100 is
0 (downward in the figure), the shaft 202 is supported by a shaft 202 fixed to the apparatus side, urged clockwise by a spring 203 in the figure, and stands by in a state of contact with a stopper 204. The leading end 201 a of the shutter opening lever 201 that is in contact with the shutter 4 comes into contact with the end 4 r of the side surface of the shutter 4. When the shutter opening lever 201 is further inserted farther from this state, the shutter opening lever 201 rotates counterclockwise in the drawing, and slides the shutter 4 to the left in the drawing. When the sliding starts, as shown in FIG. 3, the right end 40b of the left spring 40 is pressed into and engaged with the groove of the left hook 4d of the shutter, and comes off the projection 3p of the case. On the other hand, the left end 41b of the right spring 41 in the figure is
While being pressed and engaged with the projection 3q of the case, the shutter is detached from the right hook 4e of the shutter, and the right spring 41 is held as it is. Then, as the shutter 4 slides, the right end 40b of the left spring 40 moves linearly and deforms in the corner area 50 as shown in FIG. Here, a side hole 4c of the shutter 4 is provided with a discrimination hole 4s for a CD caddy, and when the disc cartridge 100 is inserted to the innermost position,
A protrusion 210 is provided on the device 200 side corresponding to the determination hole 4s.
Is provided, and the protrusion 210 is provided in the determination hole 4s.
The insertion of the disc cartridge 100 can be completed only when is fitted. Then, a sensor (not shown) detects that the disk cartridge 100 has been inserted to the completion position, and thereafter, the entire disk cartridge 100 is moved in the direction of the rotation axis of the disk, and the disk is mounted in a recordable / reproducible manner. Here, the CD caddy has the discrimination hole 4s.
There is no side portion 4 of the shutter 4 just before the insertion is completed.
c collides with the tip of the protrusion 210, and the insertion cannot be completed. As a result, the mounting of the CD caddy is prevented. In the present invention, the disk cartridge 10
0 is symmetrical in the state of FIG. Figures 4 and 6
FIG. 4 is a side view showing the outer shapes of cases 2 and 3 and a shutter 4. In FIG. 4, the discriminating hole 4s is formed at the center of the side portion 4c of the shutter 4 so as to be point-symmetrical as shown in FIG. Therefore, when the disk cartridge 100 is inserted upside down, the same operation as in FIGS. 2 and 3 can be performed when recording and reproducing the back surface, and the apparatus 200 is shown in FIGS. Only one set of mechanisms can be used for both sides of the disc, and the configuration of the apparatus is simplified and the cost is reduced. In the present embodiment, the discrimination hole 4s has a rectangular shape, but may have a circular shape as shown in FIG. 4B.
If the side surface portion 4c of the shutter 4 is point symmetric as described above, a plurality of holes may be provided as shown in FIG. In addition, as shown in FIG.
The reduction portions 20a and 20b may be provided on the front-edge-side orthogonal surface in the insertion direction so as to be point-symmetrical with respect to the front-edge-side orthogonal surface, and the projection 210a may be fitted in correspondence with this. Further, the reduction unit 20 only needs to be point-symmetrical, and FIG.
Or an arrangement configuration as shown in (d). If the disc is a single-sided recording, the reducing unit 2
By forming only one of the recording surfaces 0a and 20b corresponding to the recording surface, it is possible to determine whether the recording surface is a double-sided recording and to specify which side the recording surface is. In addition, the combination of the reduced portion and the protruding portion using the shape means, as long as the arrangement relationship is configured to be point-symmetrical on the front-edge-side orthogonal plane, for example, all of the following, including: The detection means can be replaced. 1) Combination of light emitting diode and light receiving element using optical means. 2) Combination of MR sensor and magnet using magnetic means. 3) Combination of ultrasonic transmitter using acoustic means and its receiver. 4) Combination of a contact switch and a conductor using electric means. When the disk cartridge 100 is removed from the apparatus 200, the operation is reversed, and the right end 40b of the left spring 40 in FIGS.
It returns to the state pressed by the projection 3p. Also,
In this embodiment, the structure using the torsion coil spring as the urging means of the shutter means is located in the case where the disc is not disposed in the case and the window is closed, as in the case of a currently commercially available CD caddy. May be arranged such that one tension coil spring is arranged in an area occupied by the shutter means.

According to the present invention, it is possible to obtain an effect of enabling discrimination between different types of disk cartridges having substantially the same shape at a low cost.

[Brief description of the drawings]

FIG. 1 is a plan view and a side view showing a disk cartridge of the present invention.

FIG. 2 is a plan view showing a state where the disk cartridge of the present invention has been inserted into the apparatus.

FIG. 3 is a plan view showing a state where the disk cartridge of the present invention has been completely inserted into the apparatus.

FIG. 4 is a plan view showing a configuration of a discriminating hole provided in a shutter of the disk cartridge of the present invention.

FIG. 5 is a plan view showing a reduction portion provided in the case of the disk cartridge of the present invention.

FIG. 6 is a plan view showing an alternative to the reduction unit provided in the case of the disk cartridge of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2, 3 Case 4 Shutter 5 Door 40, 41 Spring 100 Disc cartridge 200 Device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshifumi Takeuchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Media Research Laboratory of Hitachi, Ltd. (72) Masafumi Nakamura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (72) Inventor Masayuki Inoue 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Incorporated Hitachi Video Media Research Laboratories (72) Yoshio Suzuki, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa No. 292 Hitachi Image Media Research Laboratory, Ltd. (72) Inventor Michio Miura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi Image Media Research Laboratory, Ltd. (56) References JP-A-5-81815 (JP) JP-A-5-28692 (JP, A) JP-A-61-965 (JP, A) Kaihei 5-36645 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/03 G11B 23/033 G11B 23/28 G11B 19/12

Claims (1)

(57) [Claims] 1. A first disk cartridge that can be distinguished from a second disk cartridge, wherein said second disk cartridge records information on both disk surfaces and / or information from both disk surfaces. A second case to be reproduced and a second case having a quadrangular shape, containing the second case, and having a second window for exposing a part of the second stage to the outside; A second shutter slidably mounted on the second case and opening and closing the second window.
The outer surface of the case has a positional relationship orthogonal to the disk surface of the second disk, and the second orthogonal surface in which the second shutter slides along the second orthogonal surface in the sliding direction of the second shutter. A second reduction section is provided at both ends, and the second reduction section is provided so as to be point-symmetric with each other on the second orthogonal plane, A first disk having substantially the same diameter as that of the first disk and recording and / or reproducing information on one disk surface; and a first disk having substantially the same shape as the second case, A first case having a first window for exposing a part of the first disk to the outside; a first case slidably mounted on the first case for opening and closing the first window. And a shutter on the outer surface of the first case, The first disk has a positional relationship orthogonal to the disk surface of the first disk, and the first orthogonal surface on which the first shutter slides is provided with two of the two ends of the first shutter in the sliding direction. Only one of them is provided with a reduced first reduction portion, and the first reduction portion has a relationship in which only one of the second reduction portions is formed on the first orthogonal plane. A first disk cartridge, comprising: