JP2005276353A - Miniaturized disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the opening/shutting operation of a rotary shutter, in a miniaturized disk cartridge having, in a housing for rotatably accommodating a disk, an opening for making a recording/reproducing head of a drive device access the surface of the disk, the rotary shutter for opening/shutting the opening, and a tension spring having one end fixed to the rotary shutter and the other end fixed to the housing for energizing the rotary shutter in the shut direction. <P>SOLUTION: A guide part 15 projecting from the rotational surface of a lower shutter member 7D outwardly with respect to the radius direction is integrally formed on the outer circumference of the lower shutter member 7D. Accordingly, the tension spring 14 is prevented from entering the gap between the lower shutter member 7D and a lower shell 4 of the housing, and the opening/shutting operation of the rotary shutter 7 is stabilized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a small disk cartridge in which a disk is rotatably accommodated in a housing, and more particularly to stabilization of an opening / closing operation of a rotary shutter for opening / closing an opening for recording / reproducing head access formed in the housing. is there.

  Conventionally, in a mobile device such as a digital camera, an ultra-small magnetic disk cartridge as described in Patent Document 1 is used as a recording medium.

  3A to 3C show a plan view, a right side view, and a bottom view of the small-sized disc cartridge 1 in the closed state, and FIGS. 4A and 4B show the rotary shutter 7. 5 is a plan view and a bottom view in the open state, and FIG. 5 is an exploded perspective view thereof. The resin frame 2 including the pushing portion 2a and upper and lower shells 3 and 4 made of metal thin plates are used. A magnetic disk 5 having a diameter of 46.5 mm is rotatably accommodated in a flat housing having a width of 50 mm, a depth of 55 mm, and a thickness of 1.95 mm.

  The small disk cartridge 1 is configured to be inserted into a drive device (not shown) in an insertion manner, and a magnetic head (recording / reproducing head) provided in the drive device is accessed on the surface of the magnetic disk 5 in the housing. For this purpose, a V-shaped opening 6 and a rotary shutter 7 for opening and closing the opening 6 are provided.

  A rotary shutter 7 having an opening 7a having substantially the same shape as the opening 6 of the housing is composed of upper and lower shutter members 7U and 7D (see FIG. 5) engaged with each other, and the upper shutter member 7U is attached to the upper shell 3. The lower shutter member 7D is rotatably supported by the lower shell 4 respectively. A liner 18 is interposed between the magnetic disk 5 and the upper and lower shutter members 7U and 7D.

  3A, a notch 8 is formed at the front end portion of the left side surface of the housing to be engaged with the engaging member of the drive device to ensure positioning in the drive device. In the part, a small window 9 is formed, as shown in FIG. 3B, for allowing the shutter lock member 11 for locking the rotary shutter 7 to the closed position.

  The lower shell 4 of the housing is formed with a circular center hole 4a for allowing the center core 10 of the magnetic disk 5 to face the outside, and an arcuate groove 4b concentric with the rotary shutter 7, and the lower shutter member 7D has the above-mentioned A shutter knob 7b that projects from the arcuate groove 4b and moves along the arcuate groove 4b to open and close the rotary shutter 7 is fixed.

  In Patent Document 1, the rotary shutter 7 including the upper shutter member 7U and the lower shutter member 7D is urged in the closing direction by using a compression coil spring that passes through a guide wire made of a metal wire. As a few, a method using a tension spring that does not use a guide wire has been considered. FIG. 6 is a diagram for explaining the mode. FIG. 6A shows a state when the rotary shutter 7 of the small disk cartridge 1 is in the closed position, and FIG. 6B shows the state where the rotary shutter 7 is in the open position. FIG. 5 is a plan view showing a state in which only the upper shell 3 is removed while leaving the shutter lock member 11 and the magnetic disk 5 is omitted.

  A shutter lock member 11 that locks the rotary shutter 7 in the closed position is provided on the upper shell 3 with an engagement convex portion 11 a that can be engaged with an engagement concave portion 7 c formed on the outer periphery of the rotary shutter 7 at the tip. The spring 12b is spring-biased in a direction (counterclockwise in FIG. 6) in which the engagement protrusion 11a can be engaged with the engagement recess 7c. ing.

  Then, when the small disk cartridge 1 is inserted into the drive device, the lock release member of the drive device presses the shutter lock member 11 through the small window 9 so that the lock member 11 is slightly rotated clockwise. The lock of the rotary shutter 7 is released by the engagement protrusion 11a coming out of the engagement recess 7c.

  The rotary shutter 7 is urged by a tension spring 14 in the closing direction (counterclockwise in FIG. 6). The tension spring 14 is locked at one end at a first spring locking portion A formed at a portion 2b facing the outer peripheral surface of the rotary shutter 7 at the right end of the frame 2, and the other end is locked at the first spring locking portion A. An arc-shaped spring guide formed between the frame 2 and the outer peripheral edge of the rotary shutter 7, which is locked to the second spring locking portion B formed on the rotary shutter 7 on the opening direction side of the rotary shutter 7. It is accommodated in the groove 2c and stretched as shown in FIG. 6 (b) as the rotary shutter 7 opens.

When the small disc cartridge 1 is inserted into the drive device, the lock release member first presses the shutter lock member 11 to release the lock state of the rotary shutter 7, and in this state the shutter knob 7b engages the shutter knob of the drive device. Since it engages with the wall, the rotary shutter 7 is rotated while extending the tension spring 14 as the small disc cartridge 1 is pushed in, as shown in FIGS. 4 (a), 4 (b) and 6 (b). Will be open.
US Pat. No. 6,256,168

  By the way, in the small disc cartridge 1 described above, in order to reduce the sliding friction between the rotary shutter 7 and the housing, the vicinity of the rotation center of the rotary shutter 7 is expanded toward the housing, and only this portion is brought into contact with the housing. Therefore, there is a gap between the peripheral edge of the rotary shutter 7 and the housing, and there is room in the space in the housing to allow the rotary shutter to rotate smoothly. When the tension spring 14 is used as a spring for urging the shutter 7, when the rotary shutter 7 is in the open position, that is, when the tension spring 14 is being pulled, the tension spring 14 is rotated by its own restoring force. 7 in order to enter the gap between the housing and the housing. It has been found newly with a problem that the opening and closing operation of the over shutter 7 becomes unstable.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. A housing for rotatably accommodating a disk as a recording medium has an opening for allowing a recording / reproducing head of a drive device to access the surface of the disk, and the opening is opened and closed. In a small disc cartridge that has a rotary shutter that is fixed to the rotary shutter and one end that is fixed to the housing and a tension spring that biases the rotary shutter in the closing direction. The purpose is to make it easier.

  A small disk cartridge according to the present invention includes a housing that rotatably accommodates a disk as a recording medium, an opening for allowing a recording / reproducing head of the drive device to access the surface of the disk, a rotary shutter that opens and closes the opening, and one end thereof. A compact disc cartridge having a tension spring fixed to the rotary shutter and having the other end fixed to the housing and biasing the rotary shutter in a closing direction. The guide part which prevents entering into this clearance gap is formed.

  The guide portion can be formed by extending at least a part of the rotating surface of the rotary shutter further outward from the outer periphery of the rotary shutter. In addition, a rotation surface means the faceplate part which slidably contacts with a housing.

  According to the present invention, a housing that rotatably accommodates a disk as a recording medium, an opening for allowing a recording / reproducing head of a drive device to access the surface of the disk, a rotary shutter that opens and closes the opening, and a rotary shutter that is open at one end A small disk cartridge having a tension spring that urges the rotary shutter in the closing direction and a guide spring is formed on the outer periphery of the rotary shutter. By preventing entry into the gap between the shutter and the housing, the opening / closing operation of the rotary shutter can be stabilized.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of essential parts showing an embodiment of a disk cartridge according to the present invention, and FIG. 2 is an enlarged sectional view of the vicinity of a guide part in FIG.

  Since the present embodiment has the same configuration as the conventional small disc cartridge 1 described with reference to FIGS. 3 to 6 except for the configuration of the lower shutter member 7D, the same members are denoted by the same reference numerals, A duplicate description is omitted.

  FIG. 1 shows only the frame 2, the lower shutter member 7 </ b> D of the rotary shutter 7, the lower shell 4 of the housing, and the tension spring 14 that biases the rotary shutter 7 in the closing direction. A loop 14 a is formed at the other end of the tension spring 14 whose one end is locked to the first spring locking portion A.

  On the outer periphery of the lower shutter member 7D, a locking base portion 13 that protrudes radially outward from the rotation surface of the lower shutter member 7D is integrally formed, and the edge portion of the base portion 13 on the rotary shutter opening direction side is integrally formed. Further, a bent piece 13a for fitting and locking the loop 14a at the other end of the tension spring 14 is formed to constitute the second spring locking portion B.

  Further, a guide portion 15 is integrally formed on the outer periphery of the lower shutter member 7D so as to protrude radially outward from the rotation surface of the lower shutter member 7D. As a result, as shown in FIG. Can be prevented from entering the gap between the lower shutter member 7D and the lower shell 4 of the housing, so that the opening / closing operation of the rotary shutter 7 can be stabilized.

  In the present embodiment, the guide portion as described above is provided only on the lower shutter member, but may be formed only on the upper shutter member, or may be formed on both the upper shutter member and the lower shutter member. Good.

1 is an exploded perspective view of a main part of a small disk cartridge according to an embodiment of the present invention. FIG. 1 is an enlarged cross-sectional view of the vicinity of the guide portion of the small disk cartridge of FIG. A plan view (a), a right side view (b) and a bottom view (c) showing a closed state of a rotary shutter of a conventional small disk cartridge The top view (a) and bottom view (b) which show the open state of the rotary shutter of the small disc cartridge of FIG. FIG. 3 is an exploded perspective view of the small disk cartridge of FIG. FIG. 3A is a plan view showing the closed state of the rotary shutter of the small disk cartridge of FIG. 3 with the upper shell removed and the magnetic disk omitted, and the open state of the rotary shutter shown with the upper shell removed and the magnetic disk omitted. Plan view (b)

Explanation of symbols

2 frame 3 upper shell 4 lower shell 5 magnetic disk 7 rotary shutter 7U upper shutter member 7D lower shutter member 13 locking base portion 13a bent piece 14 tension spring 15 guide portion A first spring locking portion B second spring engagement Stop

Claims (2)

A housing that rotatably accommodates a disk as a recording medium, an opening for allowing a recording / reproducing head of a drive device to access the surface of the disk, a rotary shutter that opens and closes the opening, and one end fixed to the rotary shutter. And the other end is fixed to the housing and includes a tension spring that biases the rotary shutter in the closing direction.
A small disc cartridge, wherein a guide portion for preventing the tension spring from entering a gap between the rotary shutter and the housing is formed on an outer peripheral portion of the rotary shutter.   2. The small disc cartridge according to claim 1, wherein the guide portion is formed by extending at least a part of a rotating surface of the rotary shutter further outward from an outer periphery of the rotary shutter. .

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