JPH0380488A - Production of magnetic disk cartridge - Google Patents

Abstract

PURPOSE:To remove the generation of fine broken chips by preventing the other case member to be superposed to the projection parts of a miserasing preventing chip mounted on the peripheral wall of one case member from being contacted with the projection parts. CONSTITUTION:The projection parts 4C are formed on the tips of arm parts 4B extended along both the sides of a body part 4A. On the other hand, two pairs of locking projection parts 22B for locking the end part of the projection parts 4C of the arm parts 4B are formed on the inside of the peripheral wall part 22A along the sliding direction of the miserasing preventing chip 4. A pair of curved parts 22C curved in the reverse direction against the projecting direction and their pocket parts are formed between projection parts 22B. The projection parts 4C of the chip 4 are formed on the peripheral wall 22 without positioning them in the curved parts 22C and the case members 2 are superposed. Thereby, the projection parts 4C can be prevented from being contacted with the peripheral wall 22 of the locking member 2, so that the chip 4 can be integrated in the case 1 without generating fine broken chips.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a magnetic disk cartridge, and more specifically, to a write protector (erroneous erasure prevention mechanism) that prevents information recorded on a magnetic disk from being erased accidentally. Regarding how to assemble.

[Conventional technology]

A conventional method of manufacturing a magnetic disk cartridge will be described.

A magnetic disk cartridge usually has an accidental erasure prevention piece of an accidental erasure prevention mechanism slidably disposed in one corner of the case, and by biasing the accidental erasure prevention piece to one side, recording is performed on the magnetic disk. This is done to prevent accidental deletion of recorded information. The accidental erasure prevention piece is slidably housed in a storage chamber formed by each peripheral wall formed at a corner of each case member in a case made up of a pair of case members.

To explain this in more detail, the peripheral wall 2 of one case member
2, as shown in FIG. 3, there are two pairs of locking protrusions formed on the inner side of the peripheral wall 22 at the arm portions 4B of the accidental erasure prevention piece 4, and protrusions 4C14C at the tips of the 4B, facing each other. 22
B1 and 22B are configured to lock the erasure prevention piece 4 at a position where erasure is prevented or at a position where erasure is possible.

When the accidental erasure prevention piece 4 is disposed within the peripheral wall 22, conventionally, the protrusion 4C of the accidental erasure prevention piece 4 is
14C is positioned at the curved portion 22C122C formed between the pair of front and rear locking protrusions 22B, 22B of each peripheral wall portion 22A, 22A (see FIG. 3), and the other case member 2 is A magnetic disk cartridge is manufactured by stacking them on top of each other.

[Problem to be solved by the invention]

However, the thickness of the accidental erasure prevention piece 4 is formed higher than the height of any of the peripheral walls 22 of the case member 2.2, and both the upper and lower surfaces of the projections 4G and 4C are formed flat. Therefore, when the protruding portion 4C24C is positioned between the curved portion 22C122C of the peripheral wall 22 and the accidental erasure prevention piece 4 is placed on the peripheral wall 22, the protruding portions 4C, 4C
The upper surface protrudes from the surrounding wall parts 22A, 22A, and the curved part 22C122C
is curved outward from the inner surface of the case member 2, so when the other case member 2 is pressed against the one case member 2 in this state, the other case member 2 that does not have the curved portion 22C122C The peripheral wall portions 22A, 22A come into contact with the protrusion portion 4C14C, and there is a possibility that the respective contacting portions may be damaged and minute fragments may be generated.

Furthermore, there is a problem in that minute fragments caused by the damage become dust and enter the storage section of the magnetic disk, causing errors such as dropouts during recording and reproduction.

Therefore, an object of the present invention is to overlap the protrusion of the erasure prevention piece placed on the peripheral wall of one case member when manufacturing a magnetic disk cartridge by overlapping one case member and the other case member. It is an object of the present invention to provide a method for manufacturing a magnetic disk cartridge in which the peripheral wall of a case member superimposed on another case member does not come into contact with each other and produce minute fragments.

[Means to solve the problem]

The present invention provides an erroneous erasure prevention piece that prevents erroneous erasure of recorded information on a magnetic disk housed in a case formed by combining a pair of case members, and a erroneous erasure prevention piece that is slidably housed. In a method for manufacturing a magnetic disk cartridge having a circumferential wall with double bottoms on the inner surface of each corner of a pair of case members, a pair of arm portions extending along both sides of the main body of the accidental erasure prevention piece are provided. The accidental erasure prevention piece is inserted into the peripheral wall without positioning the pair of protrusions formed on the outside of the tips within the pair of curved parts formed inside the peripheral wall of one of the pair of case members. The above object has been achieved by providing a method of manufacturing a magnetic disk cartridge, which is characterized in that the other case member is assembled by superimposing the other case member on the one case member after the cartridge is placed in the magnetic disk cartridge.

[Effect]

According to the method for manufacturing a magnetic disk cartridge of the present invention, when assembling a magnetic disk cartridge by overlapping one case member and the other case member, the protrusion of the accidental erasure prevention piece is inserted into the peripheral wall of one case member. If the accidental erasure prevention piece is placed inside the peripheral wall without being positioned on the pair of curved parts, and then the other case member is overlapped and the accidental erasure prevention piece is assembled into the case, the protrusion of the accidental erasure prevention piece and There is no contact between the peripheral wall of the other case member.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 1(a) to (d) and FIGS. 2(a) and 6). In addition, in each figure,
Figures 1 (a) to (d) are views showing a magnetic disk cartridge, where (a) is an exploded view showing the inner surfaces of a pair of case members, and (b) is an erroneous view of figure (a). A developed view showing an enlarged view of the peripheral wall of each case member that houses the erasure prevention piece, Figure (C) is a perspective view showing the accidental erasure prevention piece stored in Figure (B), Figure (D) is the peripheral wall. A cross-sectional view of a portion forming a curved portion showing a state in which the accidental erasure prevention piece is housed in the second
Figures (a) and (b) are views showing how the accidental erasure prevention piece is assembled into the case, which is one step of the manufacturing method of the magnetic disk cartridge of the present invention, and Figure (a) is a plan view thereof, and Figure (a) is a top view of the same. Figure (1)) is a plan view of another embodiment.

First, a magnetic disk cartridge to which the magnetic disk cartridge manufacturing method of the present invention is applied will be described.

A magnetic disk cartridge to which the present invention is applied has a case 1 in which a magnetic disk (not shown) is housed. As shown in FIG. 1(a), the case 1 is constructed by combining a pair of case members 2.2, and each case member 2.2 has a liner formed in a substantially C shape on the inner surface thereof. 3.3 are welded to each other, and rectangular holes 21.21, through which a magnetic head (not shown) faces, are formed between the ends of each C-shaped liner 3.3.
．． At 21, information is recorded on the magnetic disk or the recorded information is reproduced.

Furthermore, rectangular peripheral walls 22.22 are formed at opposite corner portions of each of the case members 2.2,
Each peripheral wall 2 in a state where each of the above case members 2.2 is combined
2.22), the bottom of the gutter is formed to form a storage chamber in which the erroneous erasure prevention piece 4 shown in FIG. 1 is slidably stored. As shown in FIG. 1(b), the accidental erasure prevention piece 4 includes a main body 4A, and arm parts 4B extending along both sides of the main body 4A, protrusions protruding outward from the tips of the arms 4B. 4C2
4C is formed.

Further, among the pair of case members 2.2, opposing peripheral wall portions of the peripheral walls 22 of the negative case member 2, that is, a pair of peripheral wall portions 22 along the sliding direction of the accidental erasure prevention piece 4 are provided.
Two pairs of locking protrusions 22B, 22B for locking the ends of the respective protrusions 4C14C of the pair of arm parts 4B, 4B are formed on the inside of each of A and 22A (see FIG. 1(C)). has been done. Further, between the locking protrusions 22B, 22B formed on each of the peripheral wall parts 22A, 22A, there is a pair of curved parts 22C122 that curve in a direction opposite to the protruding direction of these protrusions.
C are formed to face each other, and these pair of curved portions 22C,
A pocket portion 22D is formed at 22C. and,
The accidental erasure prevention piece 4, which is slidably housed in the storage chamber, is attached to each peripheral wall 22 by a pair of protrusions 4C14C.
．． The bottom of the gutter is locked so as to be locked by two opposing locking protrusions 22B, 22B. That is, the accidental erasure prevention piece 4 is locked by the two pairs of locking protrusions 22B, 22B, and is positioned in the main body 4A to close the hole 23 formed in the periphery 922 of the other case member 2; The gutter bottom is fixed in the open position. The thickness of the erroneous erasure prevention piece 4 is set higher than the height h of each peripheral wall portion 22, as shown in FIG. 1(d).

Next, a preferred embodiment of the method for manufacturing a magnetic disk cartridge of the present invention will be described with reference to FIGS. 2(a) and 2(b).

A preferred embodiment of the method of the present invention is as shown in FIG.
14C is not located on the pair of curved portions 22C and 122C formed opposite to each other inside the circumferential wall 22 of one case member 2, but the erroneous erasure prevention piece 4 is placed inside the circumferential wall 22! ! Then, the other case member 2 is stacked and assembled to manufacture a magnetic disk cartridge.

Therefore, this implementation 1! According to the above, a peripheral wall portion 22A in which the pair of protrusions 4C14C of the accidental erasure prevention piece 4 are in contact with each other;
22A, the surrounding wall portions 22A, 22A of the other case member 2 overlapped with each other, so that each of the protrusions 4C1
4C is the peripheral wall portion 22A, 22A of the other case member 2;
The projecting portions 4C14C and the surrounding wall portions 22A, 22A of the other case member 20 are located inside the case member 2, and there is no risk of contact between the projecting portions 4C14C or the surrounding wall portions 22A, 22A of the other case member 2. There is no possibility that the magnetic disk will break off and produce minute fragments that will enter the storage portion of the magnetic disk, and there is no risk of errors such as dropouts caused by the fragments.

〔Effect of the invention〕

According to the method of manufacturing a magnetic disk cartridge of the present invention, the protrusion of the accidental erasure prevention piece is not positioned within the pair of curved parts formed inside the peripheral wall of one case member, and the accidental erasure prevention piece is After being placed in the peripheral wall, the other case member is assembled by overlapping the one case member,
The protrusion and the peripheral wall of the other case member do not come into contact with each other, so that the accidental erasure prevention piece can be assembled into the case without producing minute fragments.

[Brief explanation of drawings]

FIGS. 1(a) to 1(d) are views showing a magnetic disk cartridge. FIG. 1(a) is a developed view showing the inner surfaces of a pair of case members, and FIG. A developed view showing an enlarged view of the peripheral wall of each case member that houses the erasure prevention piece, Figure (C) is a perspective view showing the accidental erasure prevention piece stored in Figure (B), Figure (D) is the peripheral wall. A cross-sectional view of a portion forming a curved portion showing a state in which the accidental erasure prevention piece is housed in the second
Figures (a) and (b) are views showing how the accidental erasure prevention piece is assembled into the case, which is one step of the manufacturing method of the magnetic disk cartridge of the present invention, and Figure (a) is a plan view thereof, and Figure (a) is a top view of the same. FIG. 3(b) is a plan view of another embodiment, and FIG. 3 is a plan view corresponding to FIG. 2(a) or (b) showing one step of a conventional method for manufacturing a magnetic disk cartridge. L; Case 4; Accidental erasure prevention piece 4B; Arm portion 22; Peripheral wall 22C; Curved portion 2: Case portion 4A; Main body portion 4C; Projection 22B; Locking projection

Claims (1)

[Claims] An erroneous erasure prevention piece that prevents erroneous erasure of recorded information on a magnetic disk housed in a case formed by combining a pair of case members, and a pair of case members configured to slidably house the erroneous erasure prevention piece. In a method for manufacturing a magnetic disk cartridge having a circumferential wall defined on the inner surface of each corner, a pair of arm portions extending along both sides of the main body of the accidental erasure prevention piece are provided on the outside of the tips of the arm portions. The erroneous erasure prevention piece is placed within the peripheral wall without positioning the pair of respective protrusions within the pair of curved portions formed inside the peripheral wall of one of the pair of case members. After that, the other case member is superimposed on the one case member and assembled.