JPS6236723A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To improve the assembling operability of a rotary magnetic head device without producing any dynamic unbalance by forming the hole or cuts to the side of a magnetic head attachment surface at the positions symmetrical to each other centering on a rotary shaft with no change of the primary dimensions (diameter and thickness) of a rotary cylinder. CONSTITUTION:A rotary magnetic head 1 is attached to a rotary cylinder 2. Then the cylinder 2 and a rotor 4 of a rotary transformer are set to a rotary shaft 5 and a fixed member 6 and revolved respectively. A cut 2a is provided to store a part of a housing 10 and a contact needs about 5mm length to that is inserted and pulled out toward the shaft 5. However, the contact available between the rotary transformer 4 and the cylinder 2 has just 2-3mm length. Therefore, the cylinder 2 requires a hole or the cut 2a and at least a pair of said holes or cuts 2a are needed at the positions symmetrical to each other centering on the shaft 5 in terms of the dynamic balance of the cylinder 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating magnetic head device for a magnetic recording/reproducing device. The present invention relates to electrical conduction means between a magnetic head and a rotary transformer, and particularly relates to a rotary magnetic head device suitable for a video tape recorder.

[Background of the invention]

In the conventional device, for example, as described in Japanese Utility Model Application Publication No. 59-39427, a trap and a printed circuit board are attached to the opposite side of the rotary cylinder to the side on which the magnetic head is provided, and the magnetic head is connected by a conductive wire. According to this example, the conducting wire from the one-turn transformer is also connected to the printed circuit board, so (1) the conducting wire is long enough to transmit ultra-weak signals from the magnetic head, and externally induced noise is Easy to accept. (2) A large number of soldering operations are required for connection. This means that when the magnetic head wears out, it must be replaced for each rotating cylinder, which poses problems such as the need to remove many soldered parts during replacement.

[Purpose of the invention]

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

[Summary of the invention]

The present invention provides a connection between a magnetic head and a rotating transformer.
By using a male contact (plug) and a female contact (connector) without relaying the printed circuit board, the connection length is shortened, making it less susceptible to externally induced noise, and improving assembly workability. Therefore, in particular, the shape of the rotating cylinder is formed from the raw material by casting or forging.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fifth
The figure is a top plan view of the rotary cylinder according to the present invention, and FIG. 6 is a sectional view of a main part of the top plan view AOE of FIG. 5.

In FIG. 6, a rotating cylinder 2 to which a rotating magnetic head 1 is attached and a rotor 4 of a rotary transformer are assembled to a rotating shaft 5 and a fixed member 6, and are configured to be driven to rotate. A female contact 3 for connection with the rotating magnetic head 1 is attached to the rotating cylinder 2, and the female contact 3 is housed in a housing 10 made of a polymeric material. The other end 3# of the contact portion 3' of the female contactor 3 is electrically connected to the terminal portion 1' of the magnetic head 1 through brazing 8.

In Fig. 6, the terminal part 1' of the magnetic head and the female contact 3 are shown.
Since the contact portion 3' is shown approximately 1800 degrees away from the contact portion 3', there is no connection between the two. (See Figure 3) The rotor 4 is also provided with a terminal plate 11 made of a polymeric material, on which electrical connection is made with the rotor windings by brazing 9, and the other end is connected to the female contact 3. A male contact 7 is provided for making electrical contact. FIG. 3 is a plan view of the rotary cylinder 2 viewed from the male contactor 7, in the case of five heads. (The 1α is equipped with two magnetic heads [
There is. ) The first housing 10α has built-in female contacts 3' for 3 heads (2 terminals, 3 circuits), and the second housing 10b has built-in female contacts for 2 heads. ing. FIG. 4 is a side view of FIG. 3.

FIG. 1 is a perspective view of the rotary cylinder 2, which is provided with a notch 2a in which a portion of the housing 10 is accommodated, and this notch 2α is formed during casting or forging. Figure 2 shows the rotating magnetic head 1 and the notch 2.
It is a perspective view showing the positional relationship with a. Since the contact is inserted and removed in the direction of the rotation axis as in this embodiment, the length required for the contact is approximately 5 m, but the length that can be used for the contact between the rotary transformer 4 and the rotary cylinder 2 is 2. Since there is only -5■, a hole or notch 2α is required in the rotating cylinder 2. Further, in terms of the dynamic balance of the rotating cylinder, it is necessary to provide a pair of two cylinders as the minimum unit at symmetrical positions about the rotation axis. The figure shows an example in which two pairs are provided.

〔Effect of the invention〕

According to the present invention, the holes or notches are provided on the magnetic head mounting surface side at symmetrical positions with respect to the rotation axis without changing the main dimensions (diameter, stiffness) of the rotating cylinder, so dynamic unbalance does not occur. Since it is possible to use a contactor instead of a contactor, externally induced noise can be improved by 6 to 10 dB. Furthermore, by forming the holes or notches during the material forming of the rotary cylinder, improvements can be made without increasing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a single rotating cylinder according to an embodiment of the present invention, FIG. 2 is a perspective view showing only a rotating magnetic head mounted on the rotating cylinder, and FIG. 5 is a perspective view of the rotating cylinder in contact with the rotary cylinder. 4 is a side view of FIG. 6, and FIG. 5 is a top plan view showing one embodiment of the present invention. FIG. 6 is an AOB sectional view of FIG. 1. be. 1α...Rotating magnetic head 1'...
...Terminal section 2 of rotating magnetic head 1 ...
・・・Rotating cylinder 2α・・・・・・Depth of cut 5・・・・・・・・・−・Female contact 3′・・・・・・
...Contact part 3#...Contact part 3' other end 4...
・・・・・・Rotary transformer rotor 5・・・・・・
......Rotating shaft 6...Rotating member 7...Male contact 8...
...... Brazed part 9... Brazed part 10... Housing 10α... First part Zing 10b...
・Second housing 11...Terminal board

Claims (2)

[Claims] (1) A rotary cylinder equipped with a magnetic head and a rotary transformer equipped with a winding for signal transmission are provided, and one of the male contact and the female contact is connected to one of the rotary cylinder and the rotary transformer. A rotating magnetic head device in which a contact of the other type is attached to the other of the rotary cylinder and the rotary transformer, and electrical continuity between the magnetic head and the rotary transformer is obtained by the two types of contacts. In this case, holes or notches for inserting the above-mentioned contacts into the rotary cylinder are made on the magnetic head mounting surface side of the rotary cylinder at positions almost symmetrical with respect to the center of rotation, with the minimum unit of two holes or notches having a depth of 3 mm. A rotating magnetic head device characterized by having the above shape. (2) The hole or notch for inserting the male contactor or female contactor is formed by casting or forging at the same time as the rotary cylinder material is formed. rotating magnetic head device.