JPH10211636A - Mold for molding case of magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the mold for molding the case of a magnetic tape cartridge, with which a dummy board can be omitted, by a method wherein two kinds of cartridge cases such as a case, on which an opening for exposing a contact point is made, and a case, on which no opening for exposing the contact point is made, can be molded by a constitution, the cost of which is suppressed to minimum. SOLUTION: In the mold for molding the case of a magnetic tape cartridge, to which an IC board for delivering signals outside through a contact is attached, a mold portion for molding the opening for exposing a contact point of the IC board consists of one of two different inserts 33A and 33B selectively detachable to a bottom mold 31 consisting of a mold main body. The first insert 33A is so constituted as to mold the opening for exposing the contact point under its open state, while the second insert 33B is so constituted as to mold the opening for exposing the contact point under its clogged state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cartridge in which electronic parts (for example, an IC board) for storing management information of recorded contents and the like are assembled as required, separately from a magnetic tape for recording. The present invention relates to a mold for molding a case.

[0002]

2. Description of the Related Art Conventionally, in Japanese Patent Application Laid-Open No. 63-168889 and the like, apart from a magnetic tape for recording, an electronic component (for example, an IC board is often used) for storing management information of recorded contents and the like. , Described below as an IC board) in a cartridge case, and transmitting and receiving signals between a recording / reproducing device (a hardware device such as a tape recorder) and the IC board via a contact exposed to the outside. A known magnetic tape cartridge is known.

[0003] In this case, the cartridge case is provided with an opening for exposing the contacts of the IC board incorporated in the case to the outside. When the IC board is assembled to the cartridge case, the contacts of the IC board are opened. Is closed so that the contact on the hardware device side can be brought into contact with the contact from outside.

[0004] Incidentally, the IC board is assembled only when it is needed, and is not assembled when unnecessary. Therefore, when the IC board cannot be assembled, the opening remains open, and there is a possibility that the contact on the hardware device side may be caught in that portion. Therefore, usually, the opening is closed from the inside by assembling a dummy board in the same manner instead of the IC board.

[0005]

However, when a dummy board is used, a common case is required for the cartridge case. However, it is necessary to newly prepare the dummy board as a component, and the number of components increases, and the dummy board is increased. Is required, which increases the cost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and the cost of two types of cartridge cases, a case having an opening for exposing a contact and a case having the opening closed, is minimized. An object of the present invention is to provide a mold for molding a case of a magnetic tape cartridge, which can be molded with a configuration, thereby enabling the omission of a dummy board.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold for molding a case of a magnetic tape cartridge in which electronic parts for transmitting and receiving signals to and from the outside via contacts are mounted as required. A mold portion for forming an opening for exposing a contact of the electronic component is configured as two types of nests which can be selectively attached to and detached from a mold body; A mold for molding a case of a magnetic tape cartridge, characterized in that the mold is formed so as to open the opening for exposure and the second nest is formed so as to close the opening for exposing the contact. Is achieved by

According to the above configuration, the case in which the electronic component is incorporated is molded using the molding die of the case in which the first nest is set in the die body. Thereby, a case having an opening can be obtained. In the case where the electronic component is not incorporated, the case is molded using a molding die of the case in which the second nest is set in the die body. As a result, a case having a shape in which the opening is closed can be obtained.

[0009]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a main part of a mold for molding a case according to an embodiment of the present invention, FIG. 2 is a plan view of a main part of a lower half of a cartridge case obtained by molding using the mold, and FIG. FIG. 4 is an exploded perspective view of a main part of a magnetic tape cartridge as a final product.

First, the magnetic tape cartridge M will be described with reference to FIG. Magnetic tape cartridge M
Is a cartridge housing a magnetic tape (not shown) in a cartridge case 1 as a resin molded product. The cartridge case 1 has a lower half 2 and an upper half 3, and one end of the rear end walls 2a, 3a has a management data storage unit 5 for storing management information and the like of the recorded contents of the magnetic tape. And an erroneous erasure prevention unit 6 are provided. The erroneous erasure prevention portion 6 is constituted by an erroneous erasure prevention piece 20 whose claw portion is exposed from an opening 21 provided in the rear end wall 3a of the upper half 3.

The management data storage section 5 is provided as needed, and is not provided when not needed. In the illustrated magnetic tape cartridge M, the management data storage unit 5 is configured by assembling an IC board (electronic component) inside the rear end wall of the cartridge case 1. On the rear end wall 2a of the lower half 2, the IC board 10
Opening 11 for exposing a plurality of contacts 12 to the outside
Are provided corresponding to the contacts 12.

FIG. 4 is an exploded perspective view showing the management data storage section 5 in an enlarged manner and partially cut away for easy understanding. The IC board 10 has a circuit 13 and a contact 1 on a substrate 13.
The lower half 2 is fitted into an accommodation space 15 provided along the rear end wall 2a of the lower half 2, and in the fitted state, the contact 12 is formed through an opening 11 provided in the rear end wall 2a of the lower half 2. To expose. Then, for the contact point 12,
The contact on the hardware device side can be contacted through the opening 11. In this case, the accommodation space 15
Is partitioned by an elastic wall 16.
The erroneous erasure prevention piece (not shown in the figure) is accommodated behind.

In the above-described magnetic tape cartridge M, the IC board 10 is assembled to the cartridge case 1 in order to form the management data storage unit 5. However, there is a magnetic tape cartridge without the management data storage unit 5. In this case, if the opening 11 for exposing the contact is kept open in the rear end wall 2a of the lower half 2, it is inconvenient as described above.

Therefore, in order to form two types of lower halves 2 having a shape in which the opening 11 is opened and a shape in which the opening is closed, a molding die for a case according to the embodiment of the present invention is provided. FIG. 1 shows a mold for molding a case according to the present embodiment. This mold includes a lower mold 31, an upper mold 32, and two types of inserts 33A and 33B. The two types of inserts 33A and 33B correspond to a mold portion for forming an opening of the lower half 2, and are alternatively set in a concave portion 38 provided in the lower die 31, and are positioned and fixed by fixing screws 34. FIG.
1A shows a case where the first insert 33A is attached to the lower mold 31. FIG. 1B shows a case where the second insert 33B is attached to the lower mold 31.
It shows the case where it is attached to. The first nest 33A and the second nest 33B are obtained by changing only the protrusion dimensions of the distal end surfaces 41A and 41B.

The first insert 33A is attached to the lower die 31 when the lower half 2A having the opening 11 as shown in FIG. 2A is formed, and is shown in FIG. 1A. In this state, the front end surface 41A abuts on the end surface of the upper die 32, thereby eliminating the gap for the resin to enter the portion. Therefore, by injecting the resin into the cavity, the lower half 2A having the opening 11 as shown in FIG. 2A can be formed.

The second nest 33B is shown in FIG.
1B is attached to the lower mold 31 when the lower half 2A is formed by closing the opening as shown in FIG. 1B with the closing wall 11B. When the lower half 2A is attached as shown in FIG. A gap 42 into which the resin enters is secured between the upper mold 32 and the end face. Accordingly, by injecting the resin into the cavity, as shown in FIG. 2B, the lower half 2B whose opening is closed by the closing wall 11B can be formed. As a result, by using the lower half 2B of this type when the IC board is not assembled, it is not necessary to use the dummy board, and the cost can be reduced accordingly.

When the lower mold 31 and the upper mold 32 are used as a mold main body, the lower mold 31 and the upper mold 32 are attached to the mold main body in accordance with the type of molding the two inserts 33A and 33B.
With a simple configuration in which only two kinds of nests 33A and 33B are prepared, a lower half 2A with an opening and a lower half 2B with an opening closed can be formed. Cost increase can be minimized.

[0018]

As described above, according to the present invention,
By exchanging the nest and attaching it to the mold body, it is possible to obtain two types of cartridge cases, a case with an opening and a case with the opening closed, with a simple configuration in which only two types of nests are prepared. Therefore, the dummy board can be abolished without preparing two types of the whole mold, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a mold for molding a case according to an embodiment of the present invention, and FIG. 1 (a) is a diagram showing a state in which a first nest is set in a mold body so as to open an opening; (B) is a figure which shows the state which set the 2nd nest in the metal mold | die main body so that an opening might be closed.

FIGS. 2A and 2B are plan views of main parts of a lower half of a cartridge case obtained by molding with a molding die of the case shown in FIG. 1, wherein FIG. FIG. 4 is a diagram when an opening is closed.

FIG. 3 is an overall configuration diagram of a magnetic tape cartridge as a final product.

4 is an exploded perspective view of a main part of the magnetic tape cartridge shown in FIG.

[Explanation of symbols]

 M Magnetic tape cartridge 1 Cartridge case 2A Lower half with opening 2B Lower half with opening closed 10 IC board (electronic component) 11 Opening 12 Contact point 31 Lower die (die body) 32 Upper die (die body) 33A 1 nesting 33B 2nd nesting

Claims (1)

[Claims] 1. A mold for molding a case of a magnetic tape cartridge to which an electronic component for transmitting and receiving a signal to and from the outside via a contact is assembled as required. The mold part to be molded is constituted as two kinds of nests which are selectively detachable from the mold body, and the first nest is formed so as to open the contact exposure opening; The mold for molding a case of a magnetic tape cartridge, wherein the second nest is configured so as to be molded so as to close the opening for exposing the contact.