JPH03183081A - Disk cassette - Google Patents

Abstract

PURPOSE:To disable write by any device excepting for a device for a recording medium disk with high density by providing a write enable / inhibit means equipped with a sliding member at a position where the means is slightly deviated back and forth from a position symmetrical to a normal write enable / inhibit means on right and left sides. CONSTITUTION:A write protector 41 is provided at the position symmetrical to a write protector 12, which is provided in the case of a 1MB disk cassette, on right and left sides and further, the position of the write protector 41 is slightly deviated forward (on the upside in a figure) from this symmetrical position on right and left sides. Thus, even when this disk cassette is loaded to a recorder for 1MB or 2MB, write is disabled by a hole 36 for write inhibition. Therefore, the hole 36 and the write protector 41 prevent an accident so that recording can not be erroneously executed to the disk cassette by the recorder of different recording capacity.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a disk cassette, such as a high-density magnetic disk, which has a recording capacity higher than that of a recording medium disk having a normal recording capacity.

[Background of the invention]

A cassette-type magnetic disk cassette as shown in FIGS. 5 to 7 has been proposed in which a flexible magnetic disk, for example, a 3.5-inch diameter magnetic disk is housed in a hard case. In each figure, 1 is an upper case that constitutes the disk storage case body A of the disk cassette, and 2 is a lower case that cooperates with the upper case 1 to configure the disk storage case body A. The upper case 1 and the lower case 2 are made of resin, such as ABS resin containing an antistatic agent. A liner (not shown) made of a non-woven fabric such as rayon is attached to the inner surface of each of the upper case 1 and the lower case 2 by P8 welding or ultrasonic welding to prevent the dropout of the magnetic disk 3, abrasion, and generation of static electricity. It is provided by means of A magnetic disk 3 is housed in a case formed by combining an upper case 1 and a lower case 2. The magnetic disk 3 is a flexible magnetic disk that is based on a disc-shaped polymer film and has a magnetic layer uniformly formed on its surface. A circular opening is formed in the center of the magnetic disk 3, and a ring-shaped center plate 4 is fixed to this opening. A substantially square motor shaft insertion hole is formed in the center of the center plate 4, and a rectangular position regulating bottle insertion hole is formed at a position offset from the insertion hole by a predetermined distance. A circular opening 5 is formed in the center of the lower case 2, and the center plate 4 is placed in this opening 5 with some play. A long hole (not shown) is formed in the upper case 1 and a long hole 6 is formed in the lower case 2, and the magnetic disk 3 is exposed from these long holes 6. Concave portions 7 are formed on the outer surfaces of the upper case 1 and the lower case 2, including the portions where the elongated holes of the upper case 1 and the elongated holes 6 are formed. A resin-type shutter member 8 is slidably attached, and is guided by a predetermined guide means to slide. By the action of this guide means, the elongated hole 9 formed in the shutter member 8 is aligned with the elongated hole for head insertion and the elongated hole for head pad insertion, and the magnetic disk 3 is exposed to the outside. A recording and reproducing state in which the elongated hole 6 is closed by a shutter member 8 to protect the magnetic disk 3 and prevent the magnetic disk 3 from being exposed to prevent dust from entering. The shutter member 8 slides. Further, a pair of positioning holes io and ti are provided at two corners of the lower case 2 for positioning the magnetic disk when it is installed in a disk recording/reproducing device. Note that one of the positioning holes 11 is a long hole, so that even if there is some error in the position of the hole, it can be tolerated. Parts of the other two corners where the positioning holes 10 and 11 are not provided serve as reference surfaces, and the magnetic disk storage case is supported at the reference position at parts of the four corners. In this state, the magnetic disk 3 is rotated by the motor, and digital signals or analog signals are recorded or reproduced. Furthermore, a write protector 12 is slidably disposed in a part of one corner of the disk storage case main body to prevent erroneous recording on the magnetic disk 3 inside the storage case main body A. . That is, the write protector 12 is slid to the position shown in FIGS. 6 and 7, and the long hole and the small hole described below are in a communication state with their bottoms open, and the disk drive is in a write-inhibited state; The light protector 12 is moved to the left side in the figure,
A state in which the long hole and the small hole are in communication with each other is closed so that writing is possible by the disk drive device. The upper case 1 and the lower case 2 are formed into a generally shallow dish shape with a joint wall 13, 14 of a constant height provided along the outer periphery of the inner surface over almost the entire circumference. Further, on the inner surface of the lower case 2, a wall 15 that is connected to the peripheral joint wall 14 and has the same height as the joint wall 14 stands up so as to surround the corner of the rear (right side in FIG. 6) edge. It is set up. A long hole 16 is provided at a position offset to the rear edge side of the area surrounded by the joining wall 14 and the wall 15, and the long hole 16
A joining boss 17 is provided in a protruding position on the left side. Numeral 18 is a projection for holding the light protector 12 in a fixed position and giving a click feeling to the light protector 12 during operation. As shown in FIG. 7, the upper case 1 also has a wall 19 erected at a position corresponding to the wall 15 erected in the lower case 2, connected to the joint wall 13 provided along the outer periphery. It is set up. A small hole 20 is opened at a position corresponding to a position biased toward the front edge of the elongated hole 16 in the area surrounded by the joining wall 13 and the wall 19, and also corresponds to the joining boss 17. A joining protrusion 21 having a diameter that allows it to be tightly inserted into the joining boss 17 is protrudingly provided at the position where the joining boss 17 is inserted. Incidentally, on the inner surfaces of the joint wall 13 and the wall 19, there is a projection (not shown) having the same shape and size at a position corresponding to the projection 18 formed on the joint wall 14 and the wall 5 of the lower case 2. are installed protrudingly as necessary. The lower case 2 and the upper case l are positioned by fitting the joining protrusion 2 protruding from the upper case 1 into the joining boss 17 protruding from the lower case 2, and are joined to the joining boss 17. The projection 21 and other appropriate parts are fixed together by ultrasonic welding. As shown in FIG. 6, the light protector 12 can be slidably installed in the space surrounded by the joining walls 13, 14 and walls 15 and 19, and can completely cover the small hole 20. A rectangular movable piece part 12b having a width and a length and having an operating part 12a protruding from its lower surface and having a width that can be slidably inserted into the elongated hole 16; a leg portion protruding from a locking claw 12c that can engage with the protrusion 18;
It consists of 2d. This light protector 12 has a movable piece part 12b and a leg part 1.
2d and lower case 2, wall 15, upper case 1, and wall 19
The operation part 12a is inserted into the elongated hole 16, and the top part of the operation part 12a is positioned on the same plane as the outer surface of the lower case 2, so that the operation part 12a is integrated into the lower case 2. . Incidentally, when the operating section 12a is moved to the rear edge side of the case body (to the right in FIG. 6), the small hole 20 made in the upper case 1 is opened by the movable piece section 12b. A locking pawl 12c protruding from the tip of the leg 12d engages with a protrusion 18 formed on the lower case 2, and unless an external force exceeding the elastic force of the leg 12d is applied, the light protector]2 is held in this position. Furthermore, when the operating portion 12a is moved to the front edge side of the case body (left side in FIG. 6), the leg portion 12d is elastically deformed inward and disengaged from the protrusion 18, and the movable piece portion 12b
moves to close the small hole 20, but at this time, a click feeling when the leg 12d passes over the protrusion 18 is transmitted to the user's fingers, and the user is assured of operating the light protector. Then, at the end of the movement, the locking pawl 12c protruding from the tip of the leg 12d engages with the protrusion 1 formed on the lower case 2, and an external force exceeding the elastic force of the leg 12d is applied. Light protector 1 unless
2 is held in this position. Then, as shown in FIGS. 6 and 7, the magnetic disk 3 moves the write protector 12 to the right side in the figure, and the small hole 20 becomes in communication with the long hole 16 and the small hole 20. As a result, writing by the disk drive device is prohibited, and by moving the write protector 12 to the left side in the figure and closing the small hole 20, the disk drive device can write to the disk. . By the way, the above-mentioned disk cassette is a normal disk cassette that houses a recording medium disk having a normal recording capacity that has been developed for so-called 1 MB, and the disk cassette for 2 MB is shown in Fig. 8. is proposed. In other words, this 2MB disk cassette has the same structure as the 1MB disk cassette, but also has a hole 30 provided at a position approximately symmetrical to the write protector 12, and depending on the presence or absence of this hole 30, the 1MB disk cassette has the same structure as the 1MB disk cassette. If it is possible to detect whether it is a disk cassette or a 2MB disk cassette, and the hole 30 is not detected, 1
Since this is a MB disc cassette, it is impossible to write (record) on it with a 2MB recording device. Furthermore, as a 4MB or 6MB disk cassette, the one shown in FIG. 9 has been proposed. This 4MB or 6MB disk cassette has the write protector 12 and the hole 30 in the opposite position, that is, the write protector 35 and the hole 36, in the 2MB disk cassette shown in FIG. It is something. Even if an attempt is made to write (record) to the 1MB disk cassette shown in FIGS. 5 to 7 and the 2MB disk cassette shown in FIG. 8 using a 4MB or 6MB recording device, the IMB disc cassette and 2M
Since the B disc cassette has a structure equivalent to write-protection in a 4 MB or 6 MB disc cassette, it is impossible to record on a 4 MB or 6 MB recording device. Conversely, I
Even if you try to write (record) on a MB or 2MB recording device, the 4MB or 6MB disk cassette has a structure equivalent to the write-protection of a 1MB disk cassette and a 2MB disk cassette. This makes it impossible to record on IMB and 2MB recording devices. By the way, with conventional disc cassettes, it is difficult to detect which recording capacity the disc cassette has.

[Disclosure of the invention]

An object of the present invention is to provide a disc cassette whose recording capacity can be easily detected. The object of the present invention is to provide a disk cassette that houses a recording medium disk having a higher density recording capacity than a recording medium disk having a normal recording capacity, and the outer shape of the case of this disk cassette has a shape that exceeds the normal recording capacity. The outer shape is approximately the same as that of a case of a normal disk cassette that houses a recording medium disk having the above-mentioned structure, and a write-inhibiting hole is provided at the same position as the write-inhibiting hole of the write permission/inhibiting means provided in the case of the normal disk cassette. A write permission prohibition means is provided and has a sliding member at a position slightly shifted in the front and back direction from a position symmetrical to the write permission prohibition means provided in the case of the ordinary disk cassette. This is achieved by a disk cassette characterized by the following. In this disc cassette, if a detection hole is formed in the side wall of the case of the disc cassette, it becomes possible to identify more disc cassettes.

【Example】

1 to 3 show one embodiment of a disk cassette according to the present invention, FIG. 1 is an overall plan view, and FIG.
) is a plan view of the main parts of the sliding member (light protector) with the upper case removed; FIG. 2(b) is a sectional view taken along line B-B in FIG. 3(c) is a rear view, FIG. 3(a) is a sectional view of the write-inhibited hole, FIG. 3(b) is a side view, and FIG. FIG. The disk cassette of this example is a 4M disk cassette shown in FIG.
Except for the difference in the configuration of the write protector 35 in the B or 6MB disk cassette, other configurations are provided, and therefore, the same reference numerals are given to these components, and detailed description thereof will be omitted. Also, parts having the same configuration as the IMB or 2MB disk cassette shown in FIGS. 5 to 7 or 8 are denoted by the same reference numerals, and detailed explanation thereof will be omitted. Note that the reference numeral 36a in FIG. 3(a) and the like is a wall constructed around the hole 36 having the same structure as the hole 36 shown in FIG. 41 is a protrusion 4 on both sides of which constitutes a click mechanism.
2 and a protrusion 43 for operation. Reference numeral 44 denotes a recessed portion that constitutes a click mechanism in cooperation with the protrusion 42 of the light protector 41, and these four portions 44 are formed on the joint wall 14 of the lower case 2 and the standing wall 45 for isolation. Then, the write protector 41 is
), the light protector 4
The hole 46 formed in the upper case 1 by 1 and the lower case 2
Since the hole 46 is open and communicates with the hole 47 formed in the disk drive, writing by the disk drive device is prohibited, and the write protector 41 is disabled as shown in FIGS. 2(a) and 2(b).
By moving to the left side of the center and closing the hole 46, the disk drive device can write. As can be seen from the plan view of FIG. 1, and especially from the comparison with FIGS. 5 to 9, the configuration position of this write protector 41 is located at the write-permission prohibition provided in the IMB disk cassette case. It is a position that is symmetrical to the means (light protector 12), and is further shifted slightly forward (slightly upward in FIG. 1) from this symmetrical position. The disk cassette of the present invention is IMB and 2
Even if it is installed in an MB recording device, there is no write-protection hole 36.
Due to the presence of , it is impossible to write to the magnetic disk having a high density recording capacity in the disk cassette of the present invention. Therefore, due to the hole 36 and the write protector 41, there will be no accident in which recording is mistakenly performed on a disk cassette by a recording device having a different recording capacity. 48a and 48b are the left side (first
These are holes formed in the side wall (on the right side in the figure and on the lower side in FIG. 3(a)), and a prism 49 is provided so as to close these holes 48a and 48b. Therefore, as shown in FIG. 3(a), when light enters through the hole 48a, the optical path is changed by the prism 49, and the reflected light is detected from the hole 48b. The hole 48a is at a fixed position regardless of the type of disk cassette, but if the position of the hole 48b and the size of the prism 49 are made different depending on the type of disk cassette, a disk with a high density recording capacity can be created. It is also possible to distinguish between cassettes. For example, if the size of the prism 49 in FIG. 3(a) is made as indicated by the two-dot chain line, and the hole 48b is formed at the position indicated by the two-dot chain line in FIG. 3(b), these high-density It becomes possible to sort between disk cassettes having a large recording capacity. Note that the portion of the prism 49 corresponding to the wall 36a around the hole 36 is hollowed out, and the prism 49 itself is formed by connecting the wall 36a and the holes 48a, 48 of the disc storage case body A.
It is supported and fixed by the inner wall where b is formed and the case surfaces of the upper case l and the lower case 2. FIGS. 4(a), (b), and (c) show other embodiments of the disk cassette according to the present invention, and FIG. 4(a) is a sectional view of the write-inhibiting hole; (b) is a side view;
FIG. 3(c) is a sectional view taken along the line CC in FIG. 3(a). In this embodiment, unlike the disc cassettes of the previous embodiments in which the selection between disc cassettes having high-density recording capacity was carried out using optical detection means, the hole 50
a, 50b, and 50c are formed in the same manner as the holes 48a and 48b, and the holes 50a, '50b, and 50c are detected with a contact pin, thereby making it possible to sort between disk cassettes having high-density recording capacity. That is. Since other basic technical ideas are the same as those of the previous embodiment, detailed explanation thereof will be omitted.

【effect】

The disk cassette according to the present invention is a disk cassette containing a recording medium disk having a higher density recording capacity than a recording medium disk having a normal recording capacity,
The outer shape of the case of this disk cassette is approximately the same as the case of a normal disk cassette that houses a recording medium disk having a normal recording capacity, and the write permission/inhibition means provided in the case of the normal disk cassette. A write-protection hole is provided at the same position as the write-protection hole, and at a position slightly shifted in the front-rear direction from a position symmetrical to the write-permission-inhibition means provided in the case of the ordinary disk cassette. Since the write permission/inhibition means having a sliding member is provided, it is possible to reliably identify whether or not a disk cassette stores a recording medium disk having a high-density recording capacity. Writing is not possible with any device other than a device for recording medium disks with a high-density recording capacity, and writing is not possible even if a disk cassette other than this type of disk cassette is installed in a device for recording medium disks with a high-density recording capacity. It is impossible to write data into the disk cassette, and there is no fear of erroneous recording.Furthermore, the write permission and prohibition means having a sliding member allows writing to and prohibition of writing to the recording medium disk of this disk cassette, which has a high-density recording capacity. It has features such as being able to control

[Brief explanation of drawings]

1 to 3 show one embodiment of a disk cassette according to the present invention, FIG. 1 is an overall plan view, and FIG.
) is a plan view of the main parts of the sliding member (light protector) with the upper case removed; FIG. 2(b) is a sectional view taken along line B-B in FIG. (c) is a rear view, FIG. 3(a) is a sectional view of the write-inhibited hole, FIG. 3(b) is a side view, and FIG. 3(c) is C-C in FIG. 3(a).
FIGS. 4(a) and 4(b) are cross-sectional views along the line. 4(C) shows another embodiment of the disk cassette according to the present invention, FIG. )C;! Fig. 3 (a) is a cross-sectional view of the c-csst tenor, Fig. 5, Fig. 6, and Fig. 7 are a perspective view of the entire IMB disk cassette, a plan view and a sectional view of the main parts, and Fig. 8 is a FIG. 9 is a plan view of the entire 2 MB disk cassette, and FIG. 9 is a plan view of the entire 4 MB or 6 MB disk cassette. DESCRIPTION OF SYMBOLS 1... Upper case, 2... Lower case, 3... Magnetic disk, 36... Hole, 36a... Wall, 41... Write protector, 42... Projection, 43...・Protrusion, 4
4... recess, 46.47... hole, 48a, 48b.
... Hole, 49... Prism, 50a, 50b, 50c
m... hole.

Claims (2)

[Claims] (1) A disk cassette containing a recording medium disk having a higher density recording capacity than a recording medium disk having a normal recording capacity, the outer shape of the case of this disk cassette being the same as that of the recording medium disk having a normal recording capacity. It has approximately the same external shape as a case of a normal disk cassette containing the above-mentioned normal disk cassette, and a write-inhibiting hole is provided at the same position as the write-inhibiting hole of the write permission/inhibiting means provided in the case of the normal disk cassette, and , characterized in that a write permission prohibition means having a sliding member is provided at a position slightly shifted in the front-rear direction from a position symmetrical to the write permission prohibition means provided in the case of the ordinary disk cassette. disc cassette. (2) The disk cassette according to claim 1, wherein a detection hole is formed in the side wall of the case of the disk cassette.