JPS6342553Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a structure for mounting (fixing) components on a hollow mounting base formed by outsert molding on a metal substrate, and its purpose is to improve the mounting accuracy of the components. It's about trying to improve.

If a large number of mounting bases, supports, pins, etc. are formed all at once using synthetic resin on a metal substrate using outsert molding, the supports, pins, mounting bases, etc. that were formed separately on the metal substrate can be individually formed. Press-fitting, gluing,
Compared to attaching by welding or the like, productivity is significantly higher and the cost is lower.

Therefore, the above-mentioned outsert molded product is often used for products such as tape recorders, small printers, etc. that require a large number of mounting bases, supports, pins, etc. to be formed on a metal substrate.

FIG. 1 shows part of a cassette tape recorder mechanism using this type of outsert molded product.

In the figure, a head base 1 made of a metal substrate is shown.
At the head base 1, synthetic resin mounting pedestals 2, 3, pillars 4, etc. are integrally protruded and formed with the head base 1 by outsert molding. Reference numeral 5 denotes a chassis that holds the head base 1 so as to be slidable by a predetermined amount, and positioning pins 6, 7 and a reel shaft 8 are provided on the chassis 5 in a protruding manner. 9 is a tape cassette.

The mounting plate 10a of the magnetic head 10, which is a mounting component, is placed on the hollow mounting pedestal 2, and the tip of the screw 12 inserted through the washer 11, the mounting plate 10a, and the hollow part 2a of the mounting pedestal 2 is By screwing into the threaded through hole 1a of the head base 1, the magnetic head 10 is mounted on the mounting base 2, and the magnetic head 10 is grounded to the head base 1 via the screw 12.

However, in the above configuration, since the clearance between the hollow part 2a of the mounting base 2 and the screw 12 is large, the screw 12 tends to tilt as shown in the second figure, and as a result, extremely accurate mounting position accuracy is required. The mounting position of the magnetic head 10 may change, and the performance of the tape recorder may be significantly degraded. To avoid this, if the inner diameter of the hollow part 2a of the mounting pedestal 2 and the diameter of the through hole 1a of the head base 1 are made equal as shown in the third figure, the resin will
a, resulting in a situation where part or all of the through hole 1a is blocked.

In the figure, reference numeral 2b indicates a portion for attaching the mounting base 2 to the head base 1.

The present invention eliminates the drawbacks of the conventional structure as described above, and the present invention will be explained below with reference to an embodiment shown in FIG.

In the figure, the stepped screw 13, which is a mounting shaft member, has a large diameter portion 13b continuous to the head 13a, and a small diameter portion 13c continuous to the large diameter portion 13b. A screw is engraved in the portion 13c. The outer diameter of the large diameter part 13b is set to be approximately equal to the inner diameter of the hollow part 2a of the mounting base 2, and the small diameter part 13c is formed by a through hole (screw hole) of the head base 1 provided at the lower part of the hollow part 2a. ) The diameter is set to match 1a. Therefore, when the mounting screw 13 passed through the mounting plate 10a of the magnetic head 10 is inserted into the hollow part 2a, the narrow diameter part 13c is automatically positioned at a position where it can be screwed into the through hole 1, and the narrow diameter part 13c The magnetic head 10 can be accurately moved to the desired position by screwing the threaded portion of the magnetic head into the through hole 1a and clamping the mounting plate 10a between the head 13a of the mounting screw 2 and the top of the mounting base 2. The magnetic head 10 is positioned and fixed, and there is no deviation in the mounting position of the magnetic head 10 caused by the tilting of the screw 12 as in the conventional case.

In the above-mentioned embodiment, the stepped screw 13 was used as the mounting shaft member, but if the small diameter part is inserted and it is fixed to the head base 1 (metallic board) by an appropriate means such as adhesive, the screw can be used as the mounting shaft member. It can also be replaced with a mounting shaft member without a section.

As mentioned above, according to the present invention, parts such as a magnetic head are mounted using a mounting shaft member having a large diameter part that is approximately equal to the hollow part and the inner diameter of the mounting pedestal, so there is no possibility that the mounting shaft member will tilt. The misalignment of parts caused by this can be eliminated, and the accuracy of parts installation position can be improved.
It has great practical value when used in parts attachment structures for this type of outsert molded product.

[Brief explanation of the drawing]

1 to 3 relate to a conventional example, in which FIG. 1 is an explanatory diagram showing a part of the cassette tape recorder mechanism, FIG. 2 is an explanatory diagram showing misalignment of the mounting position, and FIG.
FIG. 4 is an explanatory diagram showing the inflow of resin into the through hole, and FIG. 4 is an explanatory diagram showing a structure for attaching parts to an outsert molded product according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Head base (metal board), 1a...Through hole, 2...Mounting pedestal, 2a...Hollow part, 10...
...Magnetic head (parts), 10a...Mounting plate, 13
a...Head, 13...Stepped screw (mounting shaft member),
13b...large diameter part, 13c...small diameter part.

Claims (1)

[Scope of utility model registration request] A hollow mounting pedestal formed by outsert molding is provided on a metal substrate, and the component placed on the mounting pedestal and a mounting shaft member inserted through the mounting pedestal are fixed to the metal substrate to mount the component. In the structure, a through hole smaller in diameter than the hollow part is formed in the metal substrate below the hollow part of the mounting pedestal, and a head, a large diameter part, and a small diameter part are formed in the mounting shaft member. An outsert characterized in that a small diameter portion is inserted and fixed into the through hole, and the outer diameter of the large diameter portion located within the hollow portion is approximately equal to the inner diameter of the hollow portion. Structure for attaching parts to molded products.