JPH09265602A - Head cylinder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable soldering work of an electroconductive member prior to assembly work of a fixed cylinder part and a fixed side rotary transfer and to enhance the assembling workability and stability of quality by elastically touching a ground member of a printed circuit board to a fixed cylinder part so as to be elastically connected up. SOLUTION: A hole part is provided in a center part of a ground land of the printed circuit board 3, and a tip part of the ground member 4 is bent to be elastically deformable, and the ground member is inserted into this hole, and is, under this state, soldered by solder 5 with the ground land to be integrated. When the ground member 4 is inserted into a through hole 11 of the fixed cylinder part 1, the bent part of the ground member 4 is brought into pressurized contact with an internal diameter part of the through hole 11, and under this condition, the fixed cylinder part 1 and the fixed side rotary transformer 2 are positioned and fixed up by an adhesive. Thus, by performing the soldering work prior to the assembling work of the cylinder and the fixed side rotary transformer, heat transfer to the fixed cylinder at the soldering time and deterioration of the adhesive can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding mechanism of a head cylinder device used in a magnetic recording / reproducing device such as a VTR.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus such as a VTR, as shown in FIG. 6, a fixed cylinder portion 1 around which a magnetic tape 40 is wound and guided and a rotary cylinder portion 42 above which a magnetic head is mounted are coaxial. However, it is necessary to ground both the upper rotary cylinder portion 42 and the lower fixed cylinder portion 1 due to problems such as noise. Conventionally, with respect to the fixed cylinder portion 1, the fixed cylinder portion itself is often fixed to a conductive member that is grounded, and has not been regarded as a problem.

However, in recent years, in a camera-integrated VTR or the like, a non-conductive member such as a resin molded product is used as a member for fixing the head cylinder device on the mechanical chassis in order to reduce the weight and reduce the material cost. As a result, some measures have become necessary for earthing the fixed cylinder.

As a countermeasure against this, generally, the methods shown in FIGS. 4 and 5 are widely adopted. This countermeasure will be briefly described with reference to these drawings. The fixed side rotary transformer 2 including the fixed cylinder section 1 and a printed circuit board 6 which is an output member capable of exchanging signals with the outside is fixed cylinder section. 1 through hole 11
And the land lands 61 provided on the pattern connected to the ground line of the signal processing circuit formed on the printed circuit board 6 so as to be aligned with each other, and fixed by a method such as adhesion.
Further, the ground member 7 made of a conductive material such as iron is pressed from the bottom surface side of the fixed cylinder portion 1 to the inner diameter of the through hole 11 from the bottom surface side of the fixed cylinder portion 1 until it comes into contact with the ground land 61 of the printed circuit board 6. insert. Then, the fixed cylinder portion 1 can be grounded by soldering the ground member 7 and the ground land 61 of the printed circuit board 6.

On the other hand, in a normal head cylinder device, the signal input / output portion pulled out from the fixed cylinder portion is restricted in its position and pulling direction due to the connection relation with the circuit board arranged on the mechanical chassis side. Generally there is. Therefore, conventionally, as shown in FIG. 7, a printed circuit board 6 is provided with a convex portion 62, and a fixed cylinder portion 1 is provided with a concave portion 12 as shown in FIG. A method of directly using a part of the printed circuit board 6 that is pulled out from the outer diameter portion of 1 and positioning it with a jig or the like is prized.

[0006]

In the earth connection method, when the fixed cylinder portion 1 and the fixed side rotary transformer 2 are combined, the through hole 11 of the fixed cylinder portion 1 and the earth land 61 of the printed circuit board 6 are positioned. Indispensable. Further, in the soldering work of the ground member, the heat during the soldering work escapes to the fixed cylinder part 1 and the workability is extremely deteriorated, and the fixed cylinder part 1
There is a concern that the heat transferred to the rotary transformer 2 may deteriorate the adhesive force of the adhesive for fixing the rotary transformer 2.

Further, when the fitting of the concave and convex portions is used or the jig is used for the positioning, the parts shape becomes complicated, and the equipment and work for fixing the rotary transformer become complicated. There is an evil.

[0008]

According to the present invention, a through hole is provided in the bottom surface of a fixed-side rotary transformer, and a hole portion surrounded by an earth land is provided in a substrate for electrically connecting an external signal processing circuit, and the through hole is provided. Elastically deformable in the radial direction of the hole, and when inelastically deformed, insert the end of the conductive member that has an elastic part larger in diameter than the through hole into the hole and solder it to the ground land. It is characterized in that it is press-fitted into and fixed to the fixed-side rotary transformer and the fixed cylinder portion, and in particular, the conductive member elastically bends a curved portion formed by bending a plurality of legs extending radially from the central portion. Have as a part.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A head cylinder device which is an embodiment of the present invention will be described below with reference to the drawings.
The same parts as those in FIGS. 4 and 5 are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a cross-sectional view of a main part of a fixed cylinder portion 1 of a head cylinder device of this embodiment, and FIG. 2 is an exploded perspective view of the fixed cylinder portion 1 and a fixed side rotary transformer 2.

The printed board 3 fixed to the fixed rotary transformer 2 is provided with an earth land 32 on a pattern connected to the ground line of the signal processing circuit, and the earth member 4 is provided at the center of the earth land 32. A hole 31 for inserting the tip 4a is provided.

A ground member 4 made of a metal conductive material.
Are six leg portions 41, 4 extending radially from the central portion 40.
1 is formed of a thin metal plate, and each leg is bent at a predetermined position to form an elastically deformable curved portion 41b and a tip 4a at the tip of each curved portion. In the free state, the outer diameter of the protrusion formed by each curved portion 41b is set to be slightly larger than the inner diameter of the through hole 11 of the fixed cylinder portion 1.

As shown in FIG. 3A, the earth member 4 is inserted into the hole 31 of the printed circuit board 3 and soldered with the earth land 32 and the solder 5 to ground the earth member 4.
When the center portion of the ground member 4 is inserted into the through hole 11 of the fixed cylinder portion 1 in this state, the curved portion 41b is pressed against the inner diameter portion of the through hole 11 during the insertion. The curved portion 41b is elastically deformed in the radial direction of the through hole 11, and the earth member 4 is press-fitted into the through hole 11. In this state, if the fixed cylinder portion 1 and the earth member 4 are fixed to each other with the adhesive, the fixed cylinder portion is fixed. Positioning and fixing of the portion 1 and the fixed-side rotary transformer 2 are completed.
During the assembly, the protruding portion of the printed circuit board 2 is exposed to the outside of the head cylinder device through the opening 17 formed on the side surface of the fixed cylinder portion 1.

At the completion of this assembly, as shown in FIG. 1, the curved portion 41b is still kept in pressure contact with the inner diameter portion of the through hole 11, so that the fixed cylinder portion 1 is connected to the earth member 4 by the curved portion 41b.
And is grounded via the printed circuit board 3.

In the above-mentioned embodiment, the description has been made on the assumption that the printed circuit board is a hard board, but the invention is not limited to this and the same applies to a flexible board.

Further, the earth member has a shape utilizing the elastic force of the spring, but the elastic member is not limited to the illustrated shape as long as it has elastic force in the radial direction. For example, the elastic portion is formed by bending the leg portion. Instead of this, the leg portions may be bent to form the elastic portions.

[0016]

As described above, according to the present invention, the soldering work of the conductive member can be carried out before the fixed cylinder portion and the fixed side rotary transformer are assembled.
There is no problem of deterioration of workability due to heat escape at the time of soldering and deterioration of adhesive for fixing the fixed side rotary transformer, and it is possible to improve the workability of assembly and manufacture a head cylinder device of stable quality.

Further, since the phase of the fixed cylinder portion can be determined at the same time, the shape of parts for determining the phase and the equipment and work are not complicated.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a fixed cylinder section according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a fixed cylinder portion and a fixed side rotary transformer according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating fixation of a ground member to a fixed rotary transformer according to an embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a conventional technique.

FIG. 5 is an exploded perspective view of a conventional technique.

FIG. 6 is a perspective view of a head cylinder device according to an embodiment of the present invention.

FIG. 7 is a front view of a conventional fixed-side rotary transformer.

FIG. 8 is a diagram illustrating a method of positioning a fixed-side rotary transformer with a fixed cylinder portion according to a conventional technique.

[Explanation of symbols]

 42 rotary cylinder part 1 fixed cylinder part 2 fixed side rotary transformer 3 printed circuit board 32 earth land 11 through hole 31 hole part 4 earth member 41b curved part

Claims (2)

[Claims] 1. A rotatable rotary cylinder part on which a magnetic head is mounted, a fixed cylinder part around which a magnetic tape is wound and guided and which has a through hole on the bottom surface, and a rotary rotary transformer mounted on the rotary cylinder part. A fixed-side rotary transformer that transmits signals to and from the rotating-side rotary transformer, a substrate that electrically connects the fixed-side rotary transformer and an external signal processing circuit, and a ground land provided on the substrate. And a plurality of legs that extend radially from the center,
The earth land is elastically deformable in the radial direction of the through hole and has a conductive member having an elastic portion larger in diameter than the through hole when inelastically deformed, and the end of the conductive member is inserted into the hole. After being fixed to the fixed cylinder portion by soldering, the conductive member is inserted into the through hole from the central portion side and the fixed side rotary transformer is fixed to the fixed cylinder portion with the elastic portion being pressed against the fixed cylinder portion. A head cylinder device, characterized in that it is fixed to. 2. The head cylinder device according to claim 1, wherein the conductive member has a curved portion formed by bending the plurality of leg portions, and the curved portion serves as the elastic portion. .