JP3062814B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge suitable for being set at a predetermined position in a recording / reproducing apparatus.

[0002]

2. Description of the Related Art A disk-shaped recording medium used in a recording / reproducing apparatus is protected by being housed in a disk cartridge in order to prevent breakage and dust adhesion when not in use. . Such a disk cartridge has a case composed of a combination of an upper half piece and a lower half piece, and this case houses a disk-shaped recording medium, for example, a magnetic disk or an optical disk. The case has a rotating hole into which a spindle is inserted to rotate the disk-shaped recording medium when the disk cartridge is mounted on the recording / reproducing device, and a head insertion hole through which the head can be accessed to read and write information. Are formed.

At this time, in order to accurately record or reproduce information by the head, every time the disk cartridge is mounted on the recording / reproducing apparatus, the disk cartridge is always kept in a predetermined position so that the head and the head insertion hole are aligned. It needs to be inserted into a position and kept in that state.

[0004]

The conventional disk cartridge may not be set at a predetermined position of the recording / reproducing apparatus accurately. SUMMARY OF THE INVENTION An object of the present invention is to provide a disk cartridge which is reliably set and held at a predetermined position of a recording / reproducing apparatus.

[0005]

According to a first aspect of the present invention, a case for storing a disk-shaped recording medium, a head insertion hole formed in the case and a disk-shaped recording medium are rotated. A rotating hole for opening and closing the head insertion hole and the rotating hole, and a shutter attached to the case and having a substantially U-shaped cross section and formed so as to sandwich the case between two opening / closing plates. A disc cartridge having a biasing member for biasing a shutter in a closing direction, and a recess formed in the case for slidably housing the shutter, wherein one of the open / close plates is the other of the open / close plates the upper corners of the side for opening the shutter of one of the closing plate portion the while being narrower than the width of the part projecting portion is formed, the recess is capable of accommodating to form the protrusions, One, recording disc cartridge
In order to position it at a predetermined position in the playback device,
Disk recording / playback device on the surface of the cartridge case.
At least one disposed in the device has a locating pin
Provided corresponding to the four support members, and at least one
Having positioning holes into which the positioning pins are fitted
Of the one opening / closing plate of the case
Formed on the surface of the peripheral part except the concave part of the
In both cases, the four flat reference surfaces are formed around the periphery of the case.
Double write protection unit is provided in the position excepted
The invention according to claim 2 is the disk cartridge according to claim 1, wherein the width of the open / close plate on the protrusion is the same as the width of the other open / close plate. The invention according to claim 3, wherein the projecting portion is formed on a side where the urging member is located.
The disk cartridge described in (1).

[0006]

When the disk cartridge is mounted on the recording / reproducing apparatus, the four reference surfaces of the disk cartridge abut against the four support members in the recording / reproducing apparatus, respectively, and at least one positioning pin is provided on the reference surface. The disc cartridge is inserted into the positioning hole and held at a predetermined position in the recording / reproducing apparatus.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a disk cartridge case. The case 1 is made of a synthetic resin, and includes an upper half 1a and a lower half 1b, each of which has a rectangular flat casing. In the case 1, for example, a 3.5-inch optical disk 2 (disk-shaped recording medium) on which optical information is recorded is accommodated. Lower half 1 of case 1
In the center of b, a rotation hole 4 for rotating the optical disk 2 in the case 1 by a spindle motor (not shown) when the optical disk 2 is mounted on the recording / reproducing apparatus is formed. The hub 2a provided at the center of the optical disk 2 is exposed. Also on Case 1
Head insertion holes 3 are formed in the lower halves 1a and 1b so that an optical head h (see FIG. 3) for reading information recorded on the optical disk 2 can be accessed.

When the optical disk 2 is not used, a shutter 5 is provided on the case 1 in order to prevent dust from entering the case 1 through the rotation hole 4 and the head insertion hole 3.
Is installed. The shutter 5 is urged by a torsion coil spring 14 in a direction to close the two holes. The shutter 5 is formed by bending a thin metal plate such as stainless steel from a substantially central bent portion 5a into a substantially U-shaped cross section.
An opening / closing plate 6 for opening and closing the rotary hole 4 and the head insertion hole 3 and an auxiliary opening / closing plate 7 having a shorter bending length than the opening / closing plate 6 are provided. The closing plate 6 in a shallow recess R ₁ formed in the lower halves 1b of the shutter 5, the auxiliary closing plate 7, the upper halves 1a shallow recess R ₂ which is formed on each slidable, The lifting of the end of the opening / closing plate portion 6 is regulated by a stainless steel holding plate 40 (see FIG. 2), and the lifting of the tip of the auxiliary opening / closing plate portion 7 is similarly regulated by a holding plate 41. (See FIG. 1).

When the disk cartridge is mounted on the recording / reproducing apparatus, the case 1 is provided with four support pins 120, 120, 122, 122 (support members) as shown in FIG. Supported in position. Note that the pair of support pins 120, 120 has a columnar shape, and the other pair of support pins 122, 122 has positioning pins 122a, 122a on the upper surface of the columnar body. That is, the lower half 1b of the case is placed on the four support pins, and the heads of the four support pins have four flat supported portions located on the periphery of the lower half 1b. (Reference plane)
And 123 (see FIG. 5).

On the other hand, as shown in FIG. 5, a pair of positioning holes 130, 131 into which the pair of positioning pins 122a, 122a can be fitted are provided on both sides and a rear side of the case 1 in the direction of insertion into the recording / reproducing apparatus. It is provided in the supported portion 123. The positioning hole 130 on the right side in the drawing has a circular shape, and the positioning hole 131 on the left side is formed in an elliptical shape so that the pin 122 can be inserted therein with play. In addition, each supported portion 123 is a case 1 in the player.
Is formed flat because it serves as a reference surface when supporting.

As shown in FIG. 5, the opening / closing plate 6 of the shutter 5 is formed to be narrower than the auxiliary opening / closing plate 7, and a projection 140 is formed at the upper end corner.
This is due to the shallow storage recess R of the opening / closing plate 6 of the shutter 5.
₁ wall 141 from the edge of the case to the supported portion 123
It is necessary to separate them so that they can be formed. That is, the width of the bent portion of the shutter 5 is preferably longer from the viewpoint of stable sliding. For this reason, the upper portion of the opening / closing plate portion 6 has the same width as that of the auxiliary opening / closing plate portion 7 on the back side. Part 123
The width of the opening / closing plate portion 6 is reduced to secure a sufficient size of the case, and the wall 141 is sufficiently separated from the right end of the case, and a constriction 700 is provided at a front end corner of the wall 141,
The protrusion 140 is housed in the constriction 700.

As shown in FIG. 3, a guide portion G formed at the distal end of the recording / reproducing device of the case 1 is formed on the left side in the figure and extends horizontally from the upper end surface of the case 1 to a position lowered from the upper end surface. It has a surface 8. On the right side of the guide surface 8 in the figure, an escape recess 9 is formed for dropping an opening / closing pin P provided on the player side for opening and closing the shutter 5 when the shutter 5 is opened. The opening / closing pin P moves the shutter 5 to the right in FIG. 3 to open the head insertion hole 3 and the rotation hole 4.

A bent portion 5a of the shutter 5 having a substantially U-shaped cross section
A substantially right half in FIG. 3 of a slider 12 made of a synthetic resin such as polyacetal, which slides on the guide portion G, is fixed to the inner surface of the bent portion 5a with a tapping screw or the like.

As shown in FIG. 6, the slider 12 has an elongated rod shape as a whole, has a substantially rectangular cross section, and is located inside the bent portion 5a of the shutter 5.
And a narrow extending portion 22 extending from the supporting portion 21 to the lower left in FIG. 6, and a guide portion G is provided on the right side of the supporting portion 21. Is formed, and a second engaging protrusion 24 that engages with the guide portion G is also formed on the left side of the extended portion 22, and this second engaging protrusion is formed. Reference numeral 24 includes a slide guide side 25 formed on the upper side and protruding left and right, and a fitting portion 26 formed on the lower side.

A double write protection section 160 is provided at the lower right side of the case 1 in order to prevent information from being double written on the optical disk 2 accommodated in the case 1. That is, as shown in FIG. 7, the double write protection unit 160 allows light emitted from a light emitting unit (for example, a light emitting diode) of a double write prevention sensor (not shown) provided in the recording / reproducing apparatus to pass therethrough. The upper and lower half 1a,
1b, the first and second passage holes 213a,
213b, and the first and second passage holes 213
The irradiation light having passed through a and 213b is received by a light receiving unit (for example, a photodiode) of the sensor. The irradiation light passing through the first and second passage holes 213a and 213b is blocked by the closing piece 215.

As shown in FIGS. 8 to 11, the closing piece 215 has a substantially box shape as a whole. The main body 216 has two engaging legs 217 extending from both side ends of the main body 216.
a and 217b.
a and 217b have bulges 217c and 21 at the ends thereof.
7d is formed. The closing piece 215 is stored in a storage wall 218 formed in the lower half 1b.
8 can be slid. Inside the lower half 1b of the opposite storage wall 218, the engaging legs 217a and 217 of the closing piece 215 are provided.
Engagement protrusions 218a, 218b so as to be able to engage with
Is formed.

Further, insertion recesses 505 and 505 for inserting a pin or the like to move the closing piece 215 are formed on both sides of the through hole 213b on the lower half 1b side.

When it is not necessary to operate the write protection mechanism in the case of a Hi-ROM or other optical disk, a block (closed block) 200 as shown in FIG. 11 is inserted. The block 200 has a projecting stand 201 on a base 202, and the projecting stand 201
Is fitted into a through hole 213b formed on the lower half 1b.

Next, the operation of the disk cartridge will be described with reference to FIGS. When the disc cartridge is mounted on the recording / reproducing apparatus, the support pins 120, 120, 122, and 122 shown in FIG. 4 respectively contact the four supported portions 123 of the lower half 1b shown in FIG. Then, the pair of positioning pins 122a, 122a are fitted into the positioning holes 130, 131, respectively, and the mounting is completed.

At this time, as shown in FIG.
The location where 2 is formed is the periphery of the lower half 1b, while the supported portion 123 is also located on the periphery of the lower half 1b. For this reason, the screw recess 11 on the lower side of the lower half 1b in the figure
2 and the supported portion 123 are apart from each other, so there is no danger that they will overlap.
Since it is close to 3, there is a risk of overlapping. Therefore, the upper screw recess 112 is formed at a position sufficiently separated from the supported portion 123. Therefore, the head of the upper support pin does not enter the screw recess 112. In the figure, the positioning hole 130 at the lower right is formed in a circular shape, and the positioning hole 131 at the lower left is formed in an elliptical shape so that the pin 122 can be inserted therein with play. Are slightly shifted, the pair of positioning pins 122a, 122
a is fitted into a pair of positioning holes 130 and 131. Therefore, the head of the support pin is securely in contact with the supported portion 123, the case 1 is held at a predetermined position of the recording / reproducing apparatus, and information can be accurately reproduced by the optical head h.

On the other hand, when the disk-shaped recording medium in the disk cartridge is a readable / writable medium, the closing piece 21
5 is moved downward from the position shown in FIG. Then, each bulge 217c, 2 of the engaging leg 217a, 217b is formed.
17d engages with the lower ends of the engagement protrusions 218a and 218b, and the main body 216 has first and second passage holes 213a and 213.
b (see FIG. 7) is released and held in this position. When the disc-shaped recording medium is a read-only medium such as a Hi-ROM, the closing piece 215 is moved to the position shown in FIG. At this time, the bulges 217c and 217d of the engagement legs 217a and 217b are respectively engaged with the engagement protrusions 218a and 218a.
218b is engaged with the upper end side, and the main body 216
It is held in a state where the passage holes 213a and 213b are closed,
It becomes a write-protected state.

Therefore, in this embodiment, when it is not necessary to operate the write protection mechanism on a read-only recording medium such as a Hi-ROM, a block 20 shown in FIG.
0 is fitted into a through hole 213b formed on the lower half 1b as shown in FIG. 7 (imaginary line).

In this way, the first passage hole 213a of the upper half 1a is always closed, so that there is no possibility that information is erroneously written.

[0024]

According to the present invention, one opening / closing plate of the shutter is formed narrower than the width of the other opening / closing plate, and the upper end corner of the one opening / closing plate on the side where the shutter is opened. Has a protruding portion, and the recess is formed so as to accommodate the protruding portion. Therefore, the width of the bent portion of the shutter is made as long as possible, and the shutter is slid on the case stably. Further, it is possible to secure a sufficient size of the portion supported by the support member, and to reliably set and hold the disk cartridge at a predetermined position of the recording / reproducing apparatus.

[Brief description of the drawings]

FIG. 1 is a perspective view of a 3.5-inch disk cartridge according to an embodiment of the present invention when viewed from an upper half side.

FIG. 2 is a perspective view of the 3.5-inch disk cartridge shown in FIG. 1 when viewed from a lower half side.

FIG. 3 is a front view of the disk cartridge when the shutter of the 3.5-inch disk cartridge shown in FIG. 1 is opened.

FIG. 4 is a perspective view of a positioning pin provided in a player.

5 is a plan view of a lower half of the 3.5-inch disk cartridge shown in FIG. 1;

FIG. 6 is a perspective view of a slider.

FIG. 7 is a perspective view taken along the line BB of FIG. 5;

FIG. 8 is a perspective view of the lower half of the write protection mechanism.

FIG. 9 is a plan view of FIG.

FIG. 10 is a perspective view of a write protection mechanism.

FIG. 11 is a perspective view of a block of a write protection mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 16 Lower half piece 120,122 Support pin 123 Supported part 130,131 Positioning hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-224480 (JP, A) JP-A-60-243850 (JP, A) JP-A-61-17261 (JP, A) 102049 (JP, U) Shokai Sho 59-71442 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/03 G11B 17/03 G11B 17/04 411 G11B 17/04 413 G11B 23/28

Claims (3)

(57) [Claims] 1. A case for accommodating a disk-shaped recording medium, a head insertion hole formed in the case and a rotation hole for rotating the disk-shaped recording medium, and a head insertion hole and a rotation hole for opening and closing the rotation hole. A shutter having a substantially U-shaped cross section attached to the case and formed so as to sandwich the case between two open / close plates; an urging member for urging the shutter in a closing direction; and A disk cartridge having a recess formed in the case to be slidably accommodated, wherein one of the open / close plate portions is formed to be narrower than a width of the other open / close plate portion and the shutter of the one open / close plate portion is provided. opening the the upper corner of the side projecting portions are formed, can be accommodated in the form of the recess the projecting part
And the disc cartridge is inserted into the recording / reproducing device.
Disk cartridge to position it in place.
Installed in the disc recording / reproducing device on the surface of the cartridge case
Four supports having at least one positioning pin
Provided at least one of the positions
Four flat bases with locating holes for receiving dowel pins
The reference surface is the surface of the case with the one open / close plate portion.
Along with being formed on the surface portion of the peripheral portion except the concave portion, the
A position excluding the four flat reference surfaces at the periphery of the case
Is provided with a double write protection unit.
Disk cartridge. 2. The width of the opening / closing plate on the projecting portion is the same as the width of the other opening / closing plate.
A disc cartridge according to claim 1. 3. The disk cartridge according to claim 1, wherein the projecting portion is formed on a side where the urging member is located.