JPH0638285B2 - Rotating magnetic head unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device of a magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly, to electrical continuity between the magnetic head and the rotary transformer. It is about means.

[Background of the Invention]

In the conventional device, as described in Japanese Utility Model Laid-Open No. 59-39427, a printed circuit board is attached to the surface of the rotary cylinder opposite to the surface provided with the magnetic head, and the magnetic head is connected by a conductive wire. However, in such a conventional device, since the conductor wire from the rotary transformer is also connected to the printed circuit board,
(1) The conductor wire that transmits the ultra-weak signal from the magnetic head becomes long, and it is susceptible to external induction noise. (2) The number of solders for wiring is large and workability is poor. (If the magnetic head is worn, it must be replaced for each rotary cylinder, but many soldered parts must be removed at the time of replacement.)

[Object of the Invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional example and improve the assembly workability.

[Outline of Invention]

The present invention provides a connection between the magnetic head and the rotary transformer,
By using a male contactor (plug) and a female contactor (connector) without relaying the printed circuit board, the connection length is shortened, external induction noise is less likely to occur, and assembly workability is improved. Especially regarding the contactor,
It is intended to provide a good structure in which stress strain does not occur in the brazed portion.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. First
The figure is a top plan view of the rotary magnetic head device of the present invention,
FIG. 2 is a sectional view of an essential part of the upper plan view AOB of FIG.

In FIGS. 1 and 2, 2'denotes a fixed cylinder (lower cylinder), 2 denotes a rotary cylinder (upper cylinder) attached to a rotary shaft 5 via a fixed member (disk) 6,
A rotary magnetic head 1 is attached to the cylinder as shown. Reference numeral 4'denotes a stator attached to the fixed cylinder 2 ', 4 denotes a rotor of the rotary transformer which is arranged so as to face the stator 4'and is attached to the fixed member 6 via the polymer member 11. A female contactor 3 for connection with the rotating magnetic head member 1 is attached to the rotary cylinder 2, and the female contactor is housed in a housing 10 made of a polymer material. The magnetic head member 1 is brazed to the other end 3 ″ of the contact portion 3 ′ of the female contactor 3.
Is electrically connected to the terminal portion 1 '. The polymer member 11 located above the rotor 4 is provided with a male contact 7 having one end electrically connected by brazing 9 and the other end electrically connected to the female contact 3. .

FIG. 3 is a plan view of the rotary cylinder 2 according to the present invention as seen from the terminal portion. In FIG. 3, the rotary magnetic head member 1 is attached to the rotary cylinder 2 with screws 15, and the female contactor 3 is inserted and fixed in the housing 10 to be incorporated into the rotary cylinder 2. A printed circuit board 14 for electrical connection is attached to the rotary magnetic head 1 and is brazed to the brazing portion 3 ″ of the female contactor 3. The rotary magnetic head 1 is attached to the rotary cylinder 2. At this time, the position is adjusted, but precise assembly is required again after the rotary magnetic head device is assembled.

4 is an assembly plan view of the female contactor 3 and the housing 10 of the present invention, and FIG. 5 is a side view of FIG. 6 is a detailed plan view of the female contactor of FIG. 4, and FIG. 7 is a side view of FIG. Housing 10 in FIGS.
The female contactor 3 is attached to the female contactor 3
The brazing part 3 "is located outside the housing 10. A" U "shape 31 is provided in the vicinity of the brazing part 3", and an end 32 of the "U" shape 31 has a rotating magnetic field. The head 1 is located higher than the printed circuit board 14 and a space 12 is provided between the printed circuit board 14 and the end 32 of the "U" 31. 8 and 9 are views showing other examples of the end portions. FIG. 8 is a side view of the "M" shape, and FIG. 9 is a side view of the "S" shape.

〔The invention's effect〕

According to the present invention, external induction noise can be improved by 6 dB to 10 dB, and interference is less likely to occur especially in a strong electric field area near the medium-wave broadcasting transmitting station. Further, since the number of soldering wires is greatly reduced, the workability of assembly is improved and a reliable rotary magnetic head device can be provided.

Further, according to the present invention, a force is applied to the brazing part of the female contactor by precisely adjusting the position of the rotary magnetic head 1 after brazing the brazing part of the female contactor and the printed circuit board of the rotary magnetic head. In addition, a change occurs during assembly and the connection cannot be established, and reliability is impaired. Therefore, a part of the contact in the vicinity of the brazing part is U-shaped, S-shaped or M-shaped so that stress distortion does not occur, precise position adjustment is performed, and a reliable female type that does not change during assembly The contactor shape was adopted. Further, by providing a space between the printed circuit board and the female contactor of the rotary magnetic head, it is possible to prevent the brazing wax from coming into contact with the head chip mounting metal fitting and improve the reliability.

[Brief description of drawings]

1 is a top plan view of a rotary magnetic head device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AOB in FIG. 1, FIG. 3 is a partial plan view thereof, and FIG. 4 is a plan view of FIG. Partial plan view, FIG. 5 is a side view of FIG. 4, FIG. 6 is a plan view of the contactor of FIG. 4, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a side view of “M” shape. Figure,
FIG. 9 is a side view of the "S" shape. 1 ... Rotary magnetic head, 1 '... Terminal part of magnetic head 1, 2 ... Rotary cylinder, 3 ... Female contactor, 3' ... Contact part, 3 "... Brazed part (3 ' Other end part), 4 ... Rotary transformer rotor, 5 ... Rotary shaft, 6 ... Fixing member, 7 ... Male contactor, 8,9 ... Brazed part, 10 ... Housing, 11 ... High Molecular member, 12 ... Space, 14 ... Rotating magnetic head printed circuit board, 15 ... Screw, 31 ... "U" shape, 33 ... "M" shape, 34 ... "S "Character shape part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuji Moriyama 1410 Inada, Katsuta City, Ibaraki Prefecture, Todai Plant, Hitachi Ltd. (72) Shinji Okada 1410 Inada, Katsuta City, Ibaraki Hitachi Ltd., Tokai Plant (72) Inventor Kuniaki Hirayama 1410 Inada, Katsuta-shi, Ibaraki, Inada, Tokai Plant, Hitachi, Ltd. (56) Reference JP 59-223906 (JP, A) JP 39-21426 (JP, Y1)

Claims (1)

[Claims] 1. A rotary cylinder equipped with a magnetic head, a rotary transformer provided with a winding for signal transmission, a male contactor, and a female contactor, wherein the male contactor or the above One of the female contactors is attached to the rotary cylinder or the rotary transformer, and the electrical connection between the magnetic head and the rotary transformer is obtained by the contact between the male contactor and the female contactor. In the rotary magnetic head device, the female contactor or the brazing portion of the male contactor is substantially U-shaped or S-shaped, and a printed circuit board for electrical connection of the rotary magnetic head and the female A rotary magnetic head device characterized in that an air gap is provided between the male contactor or the male contactor.