JPH0135352Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a magnetic disk device provided with a shutter that moves to expose and hide a magnetic disk housed in a disk jacket.

[Background technology and its problems]

A magnetic disk device consists of a magnetic disk housed in a disk jacket that has an insertion hole into which a drive shaft that rotates the magnetic disk is inserted, and a window for the magnetic head and pad to come into contact with the magnetic sheet at opposing positions. has been done. In order to prevent dirt from entering the disk jacket through the window and to prevent damage to the recording surface of the magnetic disk, a metal shutter that opens and closes the window is slidably attached to the disk jacket. .

FIGS. 1a and 1b are rear views of such a magnetic disk device, which was previously filed by the present applicant, disassembled into a disk jacket and a shutter, an enlarged view of the portion indicated by the dashed-dotted line in FIG. 1a, and FIGS. 2A, b, c are A- in Figure 1a
FIG. 3 is an enlarged cross-sectional view taken along line A, line BB, and line CC.

In these figures, 1 is a magnetic disk, and 2 is a disk jacket for housing the magnetic disk 1, which is composed of an upper half 2A and a lower half 2B made of synthetic resin. 3 is an insertion hole provided in the lower half 2B into which the drive shaft is inserted; 4
A and 4B are recesses on which the shutters, which will be described later, are slid, provided in the upper and lower halves 2A and 2B; 5A and 5B;
are windows into which the pads and magnetic heads provided in the recesses 4A and 4B enter, and are provided at opposing positions.
6 is a groove provided in the recess 4B parallel to one side of the lower half 2B, and 7A, 7B, 7C, and 7D are slits provided in the recess 4B of the lower half 2B from one side, reaching the groove 6. ing. 8A, 8B are the tongue pieces held by the slits 7A, 7B and slits 7C, 7D; 9A, 9B are the tongue pieces held by the upper and lower halves 2;
This is a support shaft provided on one of A and 2B.

10 is the upper and lower half 2 with the support shafts 9A and 9B.
The shutter lock pawl is pivotally supported between A and 2B.
The tip provided with the recess 11 can be rotated downward within a predetermined range around the support shaft 9A due to its elasticity.

12 is a U-shaped metal shutter, 13
A and 13B are cut and raised pieces that fit into the groove 6, and the tongue pieces 8
It is located at a position corresponding to A, 8B, and the width is tongue piece 8A,
It is slightly narrower than the width of 8B. 14A,1
Reference numeral 4B represents a squeeze portion that enters the groove 6, and reference numeral 15 represents a tongue piece that engages and disengages from the recess 11. Then, cut and raise piece 1
3A, 13B and the protrusion amount of the throttle parts 14A, 14B are slightly smaller, and the widths of the throttle parts 14A, 14B and the groove 6 are almost the same.

Note that a recess is provided between the upper and lower halves 2A and 2B, in which the tongue 15 of the shutter 12 can move.

As shown in FIG. 1, when the tongues 8A and 8B of the disk jacket 2 housing the magnetic disk 1 are placed opposite the cut and raised pieces 13A and 13B of the shutter 12, and the shutter 12 is pressed in the direction of the disk jacket 2. , the tongue pieces 8A, 8B bend inward, the cut and raised pieces 13A, 13B enter the groove 6, and the squeeze portion 14A,
14B also enters groove 6 at the same time. Therefore, the shutter 12 is prevented from coming off from the disk jacket 2 by the cut and raised pieces 13A, 13B engaging with the side walls of the groove 6, and the shutter 12 is prevented from coming off from the disk jacket 2 by the squeeze parts 14A, 14B.
guided along the recesses 4A and 4B,
Windows 5A and 5B can be opened and closed. and,
At the position where the shutter 12 closes the windows 5A, 5B, the tongue piece 15 and the recess 11 of the shutter lock pawl 10 engage, and the movement of the shutter 12 is prevented.

Note that the tongues 8A, 8B are provided so as not to coincide with the cut-and-raised pieces 13A, 13B when the windows 5A, 5B are open and when they are closed (the shutter 12 is locked). Further, when a portion of the shutter lock pawl 10 is pressed, the engagement between the recess 11 and the tongue piece 15 can be released, and the shutter 12 can be slid.

As mentioned above, the shutter 12 is guided by the groove 6 and slides in the recesses 4A and 4B of the disk jacket 2.
The cut and raised pieces 13A, 13B and the narrowed parts 14A, 14B are formed by press working to serve as a retaining part and a guide part, but it is difficult to bend the cut and raised pieces 13A, 13B at right angles, and the second As shown in Figure b, it bends so that it can be easily removed from the disk jacket 2. Furthermore, if the cut and raised pieces 13A and 13B are formed as shown by the two-dot chain lines in FIG. be. Furthermore, the squeeze parts 14A and 14B also have a semicircular shape as shown in FIG.
A downward play occurs, and the amount of engagement between the recessed portion 11 and the tongue piece 15 when the shutter 12 is in the closed state becomes substantially smaller than the amount of engagement a shown in FIG. Therefore, if the magnetic disk device is dropped, the impact may cause the recess 11 to disengage from the tongue 15, opening the windows 5A and 5B. Further, there is a problem that the side ends of the squeeze portions 14A, 14B scrape the side walls of the groove 6.

[Purpose of invention]

This idea was made in view of the above-mentioned problems, and is a magnetic disk device that prevents the guide section from scraping the side wall of the groove provided in the disk jacket and prevents the shutter from rattling. It provides:

[Summary of the idea]

In order to achieve the above-mentioned purpose, this invention consists of a guide section provided on the shutter of a magnetic disk drive by molding, and prevents the guide section from scraping the side wall of the groove provided on the disk jacket. This is to prevent the shutter from rattling.

〔Example〕

FIG. 4 is an enlarged back view showing the shutter, which is a main part of an embodiment of this invention, and FIGS. 1
The same reference numerals as in FIG. 2 indicate the same parts. In these figures, 16A, 16B, 16C, and 16D are holes provided in the shutter 12, and 17
A and 17B are holes 16A and 16 of the shutter 12.
B, a constriction part formed by slightly drawing inward between the holes 16C and 16D; 18 is a molded part formed by outsert molding using the holes 16A to 16D and the constriction parts 17A and 17B in the shutter 12;
Vertical surface 19A for preventing and guiding the shutter 12
A tapered surface 19B is provided to facilitate attachment to a disk jacket.

In the shutter 12 configured as described above, the mold part 18 for preventing slippage and guiding is molded by outsert molding, so the mold part 18 can be molded with high accuracy in position, dimension, and perpendicularity. The vertical surface 19A and the tapered surface 19B can prevent rattling in the groove 6 shown in FIG. 1, and the vertical surface 19A can improve the guidance and prevention of the shutter 12 from falling out. Therefore, the amount of engagement a between the recess 11 and the tongue piece 15 shown in FIG. 3 is sufficient.
Disengagement due to impact or the like is less likely to occur. Further, since the shutter 12 is guided along the groove 6 by the vertical surface 19A, the side wall of the groove 6 is not scraped by the molded part 18. Furthermore, since the molded portion 18 serves as a retaining portion and a guide portion, the formation of the shutter 12 can be simplified and the cut and raised pieces 13A and 13B can be omitted.

In the above embodiment, the molded part 18 serves both as a retaining part and a guide part, but the retaining part may be provided in the same manner as in the prior art, and only the guide part may be molded.

[Effect of idea]

As explained above, in the magnetic disk device of this invention, the guide section provided on the shutter is formed by molding, so that it is possible to prevent the guide section from cutting the groove provided on the disk jacket. Furthermore, since the position, dimensions, and perpendicularity of the guide portion can be formed with high accuracy, it is possible to prevent the shutter from rattling, and the shutter is less likely to be unlocked in the closed state due to impact or the like. Furthermore, if the guide part also serves as a retaining part, there is no need to provide a retaining part.
There are advantages such as ease of manufacturing the shutter.

[Brief explanation of drawings]

Figures 1a and 1b are rear views of a conventional magnetic disk device disassembled into a disk jacket and a shutter, and
An enlarged view of the part indicated by the dashed-dotted line in Fig. 1a, Fig. 2a,
b, c are enlarged cross-sectional views taken along lines A-A, B-B, and C-C in Fig. 1a, Fig. 3 is a diagram illustrating the engagement of the shutter lock pawl and the shutter, and Fig. 4 is this diagram. An enlarged back view showing the shutter, which is the main part of an embodiment of the invention, Figures 5a and b are taken along line D-D in Figure 4,
FIG. 3 is an enlarged cross-sectional view taken along line E-E. In the figure, 1 is a magnetic disk, 2 is a disk jacket, 6 is a groove, 12 is a shutter, 18 is a molded portion, 19A is a vertical surface, and 19B is a tapered surface.

Claims (1)

[Scope of utility model registration request] In a magnetic disk device comprising a synthetic resin disk jacket housing a magnetic disk and a metal shutter guided by a groove provided in the disk jacket, a guide portion of the shutter guided by the groove. A magnetic disk device characterized in that it is constructed by outsert molding.