JP2004272970A - Magnetic disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a sliding failure from occurring on a sliding part in a magnetic disk cartridge in which a shutter is held to be freely rotatable in a housing by burring, caulking, or the like. <P>SOLUTION: A bearing part 4a of a lower shell half 4 working as a bearing part of a rotary shutter 7 of the magnetic disk cartridge 1 is coated with Teflon (R) having a low friction coefficient and wear resistance as a protection film 40. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small-sized magnetic disk cartridge that can be interchangeably loaded into a card-type disk drive that can be loaded into a card slot of an electronic device such as a digital still camera, a digital video camera, or a notebook computer.
[0002]
[Prior art]
Conventionally, in a mobile device such as a digital camera, an ultra-small magnetic disk cartridge called “crik! (Registered trademark)” as described in Patent Document 1 is used as a recording medium.
[0003]
This magnetic disk cartridge has a storage capacity of 40 MB in a flat housing having a width of 50 mm, a depth of 55 mm, and a thickness of 1.95 mm, which is composed of a resin frame including a pushing portion and upper and lower shells made of a thin metal plate. A magnetic disk having a diameter of 1.8 inches (45.7 mm) is rotatably accommodated.
[0004]
A housing of the magnetic disk cartridge is provided with a V-shaped opening for allowing a magnetic head provided in the drive device to access the surface of the magnetic disk, and a rotary shutter for opening and closing the opening. This rotary shutter is spring-biased in the closing direction by a small-diameter elongated coil spring.
[0005]
Further, a notch for ensuring positioning within the drive device is formed at the front end portion of the left side surface of the housing, and a rotary shutter is formed at the front end portion of the right side surface. A small window is formed to expose a shutter lock member that locks the shutter to the closed position.
[0006]
Furthermore, a circular opening for coupling the rotary spindle of the drive device to the center core of the magnetic disk and an arc-shaped groove concentric with the rotary shutter are formed in the lower shell of the magnetic disk. A shutter knob that projects from the arc-shaped groove and moves along the arc-shaped groove to open and close the rotary shutter is fixed.
[0007]
[Patent Document 1]
US Pat. No. 6,256,168
[Problems to be solved by the invention]
By the way, in the above “click!” Rotary shutter, a protrusion formed by burring or the like on the shutter is inserted into a bearing portion formed on the housing, and then the end of the protrusion is crimped. However, sliding between the shutter and the housing due to burrs when the shutter and the housing are cut, distortion due to inaccuracy in burring or caulking, etc. There is a concern that sliding failure may occur in the portion, resulting in functional deterioration and fatal defects.
[0009]
The present invention has been made in view of the above problems, and in a magnetic disk cartridge in which a shutter is rotatably held in a housing by burring, caulking, or the like, a magnetic disk cartridge that prevents the occurrence of sliding failure of a sliding portion. Is intended to provide.
[0010]
[Means for Solving the Problems]
A magnetic disk cartridge according to the present invention includes a flexible magnetic disk fixedly held on a center core, a housing for housing the magnetic disk, and a housing for allowing a magnetic head of a recording / reproducing drive to access the surface of the magnetic disk. By providing an opening provided and a shutter for opening and closing the opening, and inserting a cylindrical protrusion formed on the shutter into a bearing formed on the housing and then crimping the tip of the protrusion In the magnetic disk cartridge in which the shutter is rotatably held around the bearing portion, the bearing portion is provided with a protective film and / or a protective member having a low friction coefficient and / or wear resistance. To do.
[0011]
Here, the “protective film and / or protective member having a low coefficient of friction” means a material having a low coefficient of friction compared to the material of the housing in which the bearing portion is formed.
[0012]
Further, “a protective film and / or protective member having wear resistance” means a material having high wear resistance as compared with the material of the housing in which the bearing portion is formed.
[0013]
The protective film having a low coefficient of friction and wear resistance is preferably a Teflon (registered trademark), titanium-based or DLC-based coating.
[0014]
In addition, as a protective member having a low friction coefficient and wear resistance, it is preferable to use an ultra high molecular PE (polyethylene) film or a Teflon (registered trademark) sheet.
[0015]
【The invention's effect】
The magnetic disk cartridge according to the present invention is provided with a protective film and / or a protective member having a low coefficient of friction and / or wear resistance on the bearing portion of the rotating shutter, so that a burr at the time of cutting the shutter and the housing, Even when there is distortion or the like due to poor accuracy of burring or caulking, the sliding property of the sliding portion can be ensured, so that the occurrence of sliding failure of the sliding portion can be prevented.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an ultra-small magnetic disk cartridge called “crik! (Registered trademark)” that is detachably attached to a PC card type drive device in a push-and-draw manner, and FIG. 1 (a) is a plan view thereof. FIG. 1B is a right side view, FIG. 1C is a bottom view, and FIG. 2 is a cross-sectional view of the lower shutter half and the lower shell half taken along the line II-II in FIG.
[0017]
FIG. 3 is a plan view showing the main body of the PC card type drive device according to the present invention. This drive device has a drive device main body 20 shown in FIG. It consists of a metal top lid (not shown).
[0018]
A magnetic disk cartridge 1 shown in FIG. 1 has a width of 50 mm, a depth of 55 mm, and a thickness of 1.95 mm, which is composed of a resin frame 2 including a pushing portion 2a and upper and lower shell halves 3 and 4 made of thin metal plates. In a flat housing, a magnetic disk 5 having a storage capacity of 40 MB and having a diameter of 1.8 inches (45.7 mm) is rotatably accommodated.
[0019]
The housing includes a V-shaped opening 6 for allowing the magnetic head 27 provided in the drive device main body 20 shown in FIG. 3 to access the surface of the magnetic disk 5, and a rotary shutter 7 for opening and closing the opening 6. Is provided. The rotary shutter 7 includes an upper shutter half 7a and a lower shutter half 7b rotatably held by the lower shell half 4, and is configured to be integrally movable by engaging both. The rotary shutter 7 is spring-biased in the closing direction (counterclockwise in FIG. 1A) by a small-diameter elongated coil spring (not shown) provided in the housing.
[0020]
Here, the holding part of the lower shutter half 7b by the lower shell half 4 will be described in detail.
[0021]
As shown in FIG. 2A, the lower shutter half 7b has a cylindrical protrusion 50 formed by burring on the lower shutter half 7b inserted into an opening of a bearing portion 4a formed on the lower shell half 4. After that, the tip 50a of the protrusion 50 is caulked to be held by the lower shell half 4 so as to be rotatable about the bearing portion 4a. The bearing portion 4 a of the lower shell half 4 is coated as a protective film 40 with Teflon (registered trademark) having a low friction coefficient and wear resistance. The protective film 40 may be a titanium or DLC coating other than the Teflon (registered trademark) coating.
[0022]
A notch 8 is formed at the front end portion of the left side surface of the housing to be engaged with an engagement member 29 in the drive device main body 20 to ensure positioning within the drive device main body 20. Is formed with a small window 9 for exposing a shutter lock member 11 that locks the rotary shutter 7 to the closed position. FIG. 1 shows a state where the rotary shutter 7 is locked in the closed position.
[0023]
The lower shell 4 of the housing is formed with a circular opening 4 a for coupling the rotary spindle 23 of the drive device main body 20 to the center core 10 of the magnetic disk 5, and an arcuate groove 4 b concentric with the rotary shutter 7. The rotary shutter 7 is fixedly provided with 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.
[0024]
A shutter lock member 11 that locks the rotary shutter 7 in the closed position is rotatably attached to a shaft 12 provided in the housing, and is biased by a spring in a direction in which the rotary shutter 7 is locked. Then, when the magnetic disk cartridge 1 is inserted into the drive device main body 20, the lock release member 19 provided on the drive device main body 20 side presses the shutter lock member 11 through the small window 9, whereby the lock member 11. Is slightly rotated in the unlocking direction so that the rotary shutter 7 is unlocked.
[0025]
The drive device main body 20 shown in FIG. 3 is obtained by removing a metal top cover from a TYPE II PC card type drive device having dimensions of 53 mm in width, 85 mm in depth, and 5 mm in thickness, and has a slot 21 into which the disk cartridge 1 is inserted. A spindle motor 22 having a spindle 23 that magnetically attracts the center core 10 of the magnetic disk 5, a head actuator 24, a swing arm 25, and a head suspension 26 supported by the swing arm 25 are provided. A magnetic head 27 that accesses the surface of the rotating magnetic disk 5 and records / reproduces information is provided at the tip of the head suspension 26.
[0026]
Further, the drive device main body 20 includes a push / push type cartridge locking / discharging mechanism 28 having an engaging member 29 that engages with the notch 8 of the magnetic disk cartridge 1, and a digital camera in which the drive device main body 20 is loaded. And an input / output interface 30 for an electronic device such as a personal computer.
[0027]
A locking wall 18 extending left and right so as to be orthogonal to the insertion direction of the magnetic disk cartridge 1 is formed on the right side of the slot 21 of the drive device body 20 as a shutter opening means and locked in the closed position. An unlocking member 19 is provided to unlock the rotary shutter 7 when the magnetic disk cartridge 1 is inserted.
[0028]
When the magnetic disk cartridge 1 is inserted into the slot 21 of the drive device, the lock release member 19 first presses the shutter lock member 11, and the shutter knob 7b engages with the locking wall 18 in this state. The rotary shutter 7 is rotated to the open position while compressing the biasing coil spring so that the shutter knob 7b slides along the locking wall 18 as the cartridge 1 is pushed, and at the same time, the notch of the magnetic disk cartridge 1 is rotated. 8, the engaging member 29 of the drive device main body 20 is engaged, and the magnetic disk cartridge 1 is stored in a predetermined position in the drive device main body 20.
[0029]
On the other hand, when the magnetic disk cartridge 1 is taken out from the drive device, the cartridge locking / discharging mechanism 28 pushes out the magnetic disk cartridge 1 by pressing the pressing portion 2a of the magnetic disk cartridge 1, and the compressed rotary shutter is energized. The initial speed at the time of ejection is ensured by the coil spring, and the rotary shutter 7 is rotated to the closed position by the biasing force of the coil spring as the magnetic disk cartridge 1 is pulled out, and is locked by the shutter lock member 11. It is configured.
[0030]
As is apparent from the above description, the magnetic disk cartridge according to the present embodiment coats the bearing portion 4a of the lower shell half 4 with the protective film 40 having a low friction coefficient and wear resistance, so that the lower shutter half 7b and lower shell half 4 can be slid due to burrs, burring processing or distortion due to poor accuracy of caulking, etc. It becomes possible to prevent.
[0031]
As shown in FIG. 2 (b), a Teflon (registered trademark) sheet having a low friction coefficient and wear resistance is applied to the bearing portion 4a of the lower shell half 4 as a protective member 41, and the same as described above. An effect can be obtained. The protective member 41 may be an ultra high molecular PE film other than the Teflon (registered trademark) sheet.
[0032]
Further, as shown in FIG. 2 (c), the bearing 4a is coated with a protective film 40, and a protective member 41 is further adhered thereon, thereby further preventing the occurrence of sliding failure of the sliding portion. It becomes possible to do.
[0033]
Furthermore, although it is preferable to provide the protective film and the protective member in all regions of the bearing portion, the protective film and the protective member are not necessarily limited to such an aspect, and may be partially provided.
[Brief description of the drawings]
FIG. 1 is a plan view (a), a right side view (b), and a bottom view (c) of a magnetic disk cartridge according to the present invention.
2 is a cross-sectional view of a lower shutter half and a lower shell half taken along line II-II in FIG. 1 (a). FIG. 3 is a plan view of a drive device main body of a PC card type drive device corresponding to a magnetic disk cartridge according to the present invention. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnetic disk cartridge 2 Frame 3 Upper shell 4 Lower shell 5 Magnetic disk 7 Rotary shutter 18 Locking wall 19 Lock release member 20 Drive apparatus main body 22 Spindle motor 40 Protective film 41 Protective member

Claims (1)

A flexible magnetic disk fixed to the center core;
A housing for housing the magnetic disk;
An opening provided in the housing for allowing the magnetic head of the recording / reproducing drive to access the surface of the magnetic disk;
A shutter for opening and closing the opening,
After the cylindrical projection formed on the shutter is inserted into the bearing portion formed on the housing, the tip of the projection is crimped to hold the shutter rotatably about the bearing portion. Magnetic disk cartridge
A magnetic disk cartridge comprising a protective film and / or a protective member having a low friction coefficient and / or wear resistance on the bearing portion.

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