JPH05120655A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To obtain an electrical connecting means having reliability by using a pressure contact type contactor for a connecting member relating to connection of the magnetic head and rotary transformer of the rotary magnetic head for video decks. CONSTITUTION:A projection 21 is provided on the periphery at the front end of the pressure contact type contactor 20 or the front end 20a of the pressure contact type contactor 20 is bent to the inner side. The bending of the pressure contact type contactor is suppressed even if the front end of the pressure contact type contactor 20 receives an external pressure. A reliable contact is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device in a video signal magnetic recording / reproducing device such as a television.

[0002]

2. Description of the Related Art In this type of rotary magnetic head device,
The connection structure between the magnetic head and the rotary transformer rotor portion is described, for example, in Japanese Utility Model Laid-Open No. 1-170314.

FIG. 5 shows a first technical idea (referred to as a first prior art) disclosed in the above application. In the figure, reference numeral 1 is a rotor shaft rotatably held on a fixed side via a bearing 2, and a rotor 3a of a motor 3 is provided below the rotor shaft.
Is fixed, and the core rotating body 4 is fixed on the upper part thereof. Reference numeral 5 is a rotary cylinder fixed to the core rotating body 4 by means such as screwing, to which a magnetic head 6 is fixed, and a head substrate 7 is bonded and integrated with the magnetic head 6. Reference numeral 8 denotes a rotary transformer rotor portion fixed to the core rotating body 4 by means such as adhesion, and a connection board 9 for the rotary transformer rotor portion 8 is connected and integrated.
Reference numeral 10 denotes a fixed cylinder, on the upper surface of which a rotary transformer stator portion 11 facing the rotary transformer rotor portion 8 is attached and is integrated with a stator 3b of the motor 3.

The lower end 12a of the first relay terminal 12 is connected to the connection end of the head substrate 7 with the solder 13, and the first relay terminal 12 is connected to the lower end 12a.
An upper end 12b of 12 is connected to a predetermined connecting end of a relay board 14 attached to the upper part of the rotary cylinder 5 with a solder 13. In addition, a second relay terminal is provided at a predetermined connection end of the relay board 14.
The upper end 15b of 15 is connected by solder 13, and the lower end 15a of the second relay terminal 15 is connected by solder 13 to the connection end of the connection board 9.

As described above, in the first prior art shown in FIG. 5, the first relay terminal 12, the relay board 14, the second relay terminal 15,
Via the head substrate 7 (magnetic head 6) and the connection substrate 9
(Rotating transformer rotor section 8) is electrically connected.

FIG. 6 shows a second technical idea (referred to as a second prior art) disclosed in the above-mentioned prior application. In the rotary magnetic head device shown in FIG. 2, the connection ends (connection patterns) of the head substrate 7 attached to the rotary cylinder 6 and the connection substrate 9 attached to the rotary transformer rotor unit 8 are connected. Between the end (connection pattern),
The head substrate 7 and the connection substrate 9 are electrically connected to each other by a press contact type contactor 16 having a conductive pattern drawn on the outer peripheral surface. The press contact type contactor 16 is held by the holding member 17 so as to exert a press contact force.

Although not shown, the prior application describes a third technical idea (referred to as a third prior art). In the third prior art, the rotary cylinder 5 is used.
A first relay pin that is electrically connected to the head substrate 7 is provided on the side, and a second relay pin that is electrically connected to the connection substrate 9 is provided at the rotary transformer rotor portion 8. The first and second relay pins are connected to each other. The crimping and connection are made in a hole formed in the rotary cylinder 5 parallel to the axial direction.

[0008]

In the first prior art shown in FIG. 5, the first relay terminal 12, the relay board 14 and the second relay terminal 15 are required as described above, and the number of parts is large and the structure is complicated. In addition, there is a problem that there are many connection processes using solder.

Further, in the second prior art shown in FIG. 6, a holding member 17 for pressing the pressure contact type contactor 16 is required, and one pressure contact type contactor 16 must be inserted at each contact point. However, there is a problem that assembly workability is poor and stable electrical contact cannot be made due to displacement of the contactor.

Further, in the third prior art shown in FIG. 6, a pair of relay pins is required for each connection point, the number of parts increases, and the mounting of each relay pin is troublesome. There is.

Generally, in each of the prior arts, the workability of attaching the connecting member is not taken into consideration, and a hole parallel to the axial direction of the rotary cylinder (the relay terminals 12, 15 or the holding member 17 or the pair) is provided. It is necessary to provide a hole for inserting the relay pin which has become a problem, and there is also a problem that the degree of freedom in design is impaired due to the space factor.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a rotary magnetic head device which has a simple connection structure between a magnetic head and a rotary transformer rotor part and which can achieve stable electrical contact.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention comprises a rotary cylinder equipped with a magnetic head,
The rotary transformer includes a rotary transformer rotor unit integrally incorporated in the rotary cylinder, and a fixed cylinder incorporating a rotary transformer stator unit that opposes the rotary transformer rotor unit, and the magnetic head side connection end portion and the rotary transformer rotor. In a rotary magnetic head device in which electrical contact with the contact end on the side of the pressure contact is performed by a pressure contact type contactor, the periphery of the tip of the pressure contact type contactor is covered with a polymer agent.

[0014]

The operation will be described according to the means for solving the problems.

(1) The circumference of the pressure contact type contactor attached to the rotary transformer is covered with a polymer material so as to protect the tip end portion of the pressure contact type contactor, thereby preventing the pressure contact type contactor from bending or sagging during the assembly work. Provide a stable electrical connection means when the rotating cylinder is attached.

(2) The tip portion of the pressure contact type contactor attached to the rotary transformer can be bent vertically or more to protect the tip portion of the pressure contact type contact element, so that the pressure contact type contact element can be bent or dented during assembly work. And provides a stable electrical connection means when the rotary cylinder is attached.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to each embodiment shown in FIGS.

FIG. 1 is a sectional view of a main part of a rotary magnetic head device according to a first embodiment of the present invention. In the figure, 4 is a core rotating body, 5 is a rotating cylinder, 6 is a magnetic head, 7 is a head substrate, 8 is a rotary transformer rotor part, 9 is a polymer material for attaching a pressure contact type contactor, 10 is a fixed cylinder, 11 Is a rotary transformer stator part, and since these members are equivalent to those shown in FIG. 5, the description thereof is omitted here to avoid duplication. Reference numeral 20 is a pressure contact type contactor, which is press-fitted or insert-molded on the polymer material 9 for the rotary transformer rotor section, and 21 is a protrusion for protecting the tip end portion of the pressure contact type contactor 20 before assembly. The pressure contact type contactor 20 in this state prevents bending due to an external force.

In the assembled state, as shown in FIG. 1, the contact end of the head substrate 7 of the magnetic head 6 attached to the rotary cylinder 5 is pressed against the pressure contact type contact 20, and the present embodiment having such a configuration is adopted. In the example, this ensures that the magnetic head 6 and the rotary transformer rotor portion 8 are electrically connected to each other.

FIG. 2 is a sectional view of the main parts of a rotary magnetic head device according to the second embodiment of the present invention. In this embodiment, the tip end of the pressure contact type contactor 20 of the first embodiment is in the recess 22 of the polymer material, and the pressure contact type contactor 20 in the state before assembly prevents bending due to external pressure. ing. This embodiment having such a structure also has the same effect as that of the first embodiment.

FIG. 3 is a sectional view of the main parts of a rotary magnetic head device according to the third embodiment of the present invention. In the present embodiment, the tip 20a of the pressure contact type contactor 20 of the first embodiment is bent inward more than vertically, and the pressure contact type contactor 20 in the state before assembly receives external pressure. Bending is prevented by making it difficult. This embodiment having such a structure also has the same effect as that of the first embodiment.

FIG. 4 is a sectional view of a main part of a rotary magnetic head device according to the fourth embodiment of the present invention. The rotary cylinder device is assembled and disassembled by constructing the pressure contact type contactor 20 in this embodiment so that the pressure contact type contactor 20 does not exceed the elastic limit when the pressure contact type contactor 20 is crushed to the same height 23 as the protrusion of the first embodiment. The pressure contact type contactor 20 is restored to the initial state even after repeated steps, and can be reassembled any number of times. In this embodiment having such a configuration, the magnetic head 6 and the rotary transformer rotor portion 8 are separated by this. It will be electrically conductive.

[0023]

As described above, when the present invention is selected, the connection structure between the magnetic head and the rotary transformer section is simple and reliable, and the magnetic head and the rotary transformer rotor section are electrically connected to each other. It will be conducted.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 4 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 5 is a sectional view of a rotary magnetic head device according to an embodiment of the prior art.

FIG. 6 is a sectional view of a rotary magnetic head device according to an embodiment of the prior art.

[Explanation of symbols]

 1 ... Rotating cylinder, 2 ... Magnetic head, 3 ... Magnetic head substrate, 3-1 ... Solder, 4 ... Relay terminal, 4-1 ... Relay terminal end (head side), 4-2 ... Relay terminal end (relay) Board side), 5 ... Relay board, 5-1 ... Solder, 5-2 ... Solder, 6 ... Rotating transformer, 7 ... Rotating transformer board, 7-1 ... Solder, 8 ... Relay terminal, 8-1 ... Relay terminal end Section (rotating transformer side), 8-2 ... relay terminal end (relay board side), 9 ... pressure contact type contactor, 10 ... pressure contact type contactor holding member, 11 ... metal piece pressure contact type contactor, 12 ... wire rod connection Fixing groove, 13 ... Rotating transformer wire, 20 ... Pressure contact type contactor, 20a ... Pressure contact type contactor tip, 21 ... Polymer agent protrusion, 22 ... Polymer agent recess.

Front page continuation (72) Inventor Shinji Ozaki 1410 Inada, Katsuta City, Ibaraki Prefecture Inside the Nitrate Works Tokai Plant

Claims (4)

[Claims] 1. A rotary cylinder equipped with a magnetic head that rotates at a predetermined rotational speed, a rotary transformer that is a signal transmitting means between the magnetic head and a fixed body, and an electric motor that rotates the rotary body. In the equipped rotary magnetic head device, a pressure contact type contactor held by a polymer material such as a mold resin is attached to the rotary cylinder or the rotary transformer, and an electric conductor such as a printed circuit board is opposed to the pressure contact type contactor. In the rotary magnetic head device, which is configured to obtain electrical conduction when the rotary cylinder and the rotary transformer are assembled by assembling the rotary cylinder, the tip of the contact portion of the pressure contact type contactor is surrounded by the convex wall of the polymer material. A rotary magnetic head device characterized by the above. 2. The rotary magnetic head device according to claim 1, wherein the tip of the pressure contact type contact is recessed in a polymer material. 3. The rotary magnetic head device according to claim 1, wherein a tip shape of the pressure contact type contactor is bent inward more than vertically. 4. The tip of the contact portion of the pressure contact type contactor.
4. The rotary magnetic head device according to claim 1, 2 or 3, wherein the pressure contact type contactor does not exceed an elastic limit even when pressure is applied up to the height of the convex wall.