JPS61104302A - Rotary head device of vtr - Google Patents

Abstract

PURPOSE:To facilitate the electric connection between a rotary transformer and a magnetic head by setting a spring contact attaching plate, which is constituted by providing a spring contact, to a cylinder and pressing the spring contact to the conductive face of a printed circuit attached to the rotary transformer. CONSTITUTION:Head coil ends 2a and 2b are soldered to a head terminal strip 5 attached to a head base 2, and spring contacts 7a and 7b are soldered to the other lead-wired end of this head terminal strip 5. Meanwhile, rotor coil ends 8a and 8b are soldered to a printed circuit 4 attached to a rotary transformer 8; and when a cylinder 1 and a disc 3 are fitted to each other, spring contacts 7a and 7b are pressed to the conductive face of the other lead-wired end of the printed circuit 4, and the cylinder 1 and the disc 3 are fixed with screws 1a and 1b, thus keeping rotor coil ends and head coil ends connected electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary head device for a VTR in which a magnetic head and a rotary transformer are electrically connected through a spring contact.

(Conventional configuration and its problems) The conventional electrical connection between the magnetic head and the rotary transformer is as shown in FIG. Attach plate 4 and solder the end of the rotor coil to the printed wiring board.

A lead wire 4 is connected to the other end of the printed wiring board where the lead wire is connected.
a and 4b, or solder the lead pins, etc., and attach the head terminal plate 5 to the head base 2 attached to the cylinder 1.
, solder the coil end of the magnetic head (hereinafter referred to as head coil end) to the head terminal board, and solder the lead wires 5a and 5b or lead pins, etc. to the other end of the head terminal board where the lead wires are connected. and then connect the lead wires 4a and 4 using a printed wiring board 6 etc. attached to the cylinder.
b, 5a and 5b, or lead pins, etc., were electrically connected by soldering.

In this case, there is a lot of soldering work for electrical relaying, which significantly reduces workability, and the large number of parts increases the cost. In addition, during head replacement work during service, etc., workability such as solder sucking is poor, and since a soldering iron is used, there is a possibility that it may have an adverse effect on other parts (e.g., the tip of the soldering iron touches other parts, etc.) There is.

(Object of the Invention) The present invention eliminates such conventional drawbacks, and electrically connects a magnetic head and a rotary transformer by simply fitting a cylinder and a disk, significantly improving work efficiency and reducing costs. Aimed at down.

(Structure of the Invention) In order to achieve this object, the present invention inserts a spring contact mounting plate configured by providing a spring contact into a cylinder to which a magnetic head is attached, and connects the end of the head coil and the spring contact to a wiring board. At the same time, attach a printed wiring board having a conductive surface to the rotary transformer by soldering the ends of the rotor coil and attaching the spring contacts to the four surfaces of the other end of the printed wiring board where the lead wires are connected. An electrical connection is made by press-welding the two.

(Description of Embodiment) Hereinafter, one embodiment of the present invention will be described using FIG. 2. Figure (a) is a cross-sectional view showing a rotary head device of a VTR, and figure (b) is an exploded perspective view of the main parts. In addition, in Figure 2, the first
Parts that are the same as those in the figure are given the same numbers.

In FIG. 2, reference numeral 7 denotes a spring contact mounting plate having downwardly protruding spring contacts 7a and 7b, and upward positioning dowels 7C and 7d formed therein. The dowel is inserted into a positioning hole provided in the cylinder 1.

Next, to explain the electrical connection between the rotor coil end and the head coil end with the above configuration, the head coil ends 2a and 2b are soldered to the head terminal board 5 attached to the head base 2, and the leads of the head terminal board are soldered. Spring contacts 7a and 7b are soldered to the other wired ends. On the other hand, the rotor coil ends 8a and 8b are soldered to the printed wiring board 4 attached to the rotary transformer 8, and the cylinder 1
When the disk 3 is fitted, spring contacts 7a and 7b are formed on the conductive surface of the other end of the printed wiring board 4 where the lead wires are connected.
The rotor coil end and the head coil end are electrically connected and maintained by fixing the cylinder 1 and the disk 3 using screws 1a and 1b.

(Effects of the Invention) As explained above, according to the VTR rotary head device of the present invention, a spring contact mounting plate configured by providing spring contacts on a cylinder is attached, and a conductor of a printed wiring board attached to a rotary transformer is mounted. By press-contacting the spring contacts to the surface, the rotary transformer and the magnetic head can be electrically connected easily, and the number of parts such as lead wires or lead pins and printed wiring boards can be reduced, the soldering work can be reduced, and the service time can be reduced. Effects such as simplification of head replacement work can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a rotary head device of a conventional VTR.
FIG. 2 shows an embodiment of the present invention, in which (a) is a sectional view of a rotary head device of a VTR, and (b) is an exploded perspective view of the main parts. 1...Cylinder, LA, LB...Fixing screw,
2...Head base, 2a, 2b...Head coil end, 3...Disk, 4, 6...Printed wiring board, 5...Magnetic head terminal board, 4a, 4b
, 5a. 5b... Lead wire or lead pin, 7... Spring contact mounting plate, 7a, 7b... Spring contact, 8
... Rotor coil end, 9 ... Shaft. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 2

Claims (2)

[Claims] (1) In a rotary head device for a VTR, which has a cylinder to which a magnetic head is attached and a disk to which a rotary transformer is attached, and in which the magnetic head and the rotary transformer are electrically connected, a spring contact is attached to the cylinder. a spring contact mounting plate configured by providing a spring contact, the spring contact electrically connecting to the magnetic head, and electrically connecting an end of the rotor coil of the rotary transformer to a printed wiring board having a conductive surface; A rotary head device for a VTR, characterized in that the spring contact is brought into direct pressure contact with a conductor surface of the printed wiring board for electrical connection. (2) A positioning hole is provided in the cylinder, a positioning dowel is formed in the spring contact mounting plate, and the dowel of the spring contact mounting plate is engaged with the positioning hole of the cylinder. V as described in claim (1)
TR rotating head device.