KR940008566Y1 - Drum motor for video tape recorder - Google Patents

Abstract

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Description

Drum motors of video tape recorders

1 is a longitudinal sectional view of a conventional drum motor.

2 is a longitudinal sectional view of the drum motor of the present invention.

(A) of FIG. 3 is a top view with the head attached to a rotary transformer, (b) is sectional drawing of (a).

* Explanation of symbols for main parts of the drawings

1: lower drum 2: stator trance

3: bearing 4: shaft

5: fixing member 6: magnet

7: rotor 8: core

9: coil 10: stator

11 motor portion 12 upper drum

13: Boss 14: Head

15: Rotary Transformer 16: Substrate

17a, 17b: lead wire

The present invention relates to a drum motor of a video tape recorder, in particular, an upper drum. In a conventional drum motor provided with a lower drum and a motor unit on a shaft, a head is attached to a rotary transformer installed in the upper drum so as to be directly connected to the circuit.

In the conventional drum motor, as shown in FIG. 1, a lower drum 1 is fixed to a drum base (not shown), and a stator transformer 2 is installed inside the lower drum 1, In the center of the drum (1), a shaft (4) supported by a bearing (3) penetrates, and a rotor (7) having a magnet (6) attached to a fixing member (5) fixed to the shaft (4) at a lower portion thereof; In addition, a motor unit 11 including a stator 10 having a coil 9 wound around the core 8 is installed, and the boss 13 of the upper drum 12 is disposed above the lower drum 1. It is fixed to (4), the head 14 and the rotary transformer 15 is fixed to the bottom of the upper drum 12 separately, the substrate 16 is provided on the upper surface of the upper drum 12 is the head 14 and the rotary transformer 15 and the conductive wires 17a and 17b.

The conventional drum motor configured as described above interacts with the magnet 6 inside the rotor 7 when the current flows through the coil 9 wound around the core 8 of the stator 10 to generate the magnetic field. Since the rotor 7 and the fixed member 5 fixed to the shaft 4 are fixed to the shaft 4, the shaft 4 rotates.

The shaft 4 is smoothly rotatable by the bearing 3, and the upper drum 12 is fixed to the boss 13 fixed above the shaft 4 so that the upper drum 10 rotates. . The substrate 16 mounted on the upper surface of the upper drum 12 by reading a signal of a tape (not shown) which is transferred while the head 14 fixed to the lower surface of the upper drum 12 is rotated by the rotation of the upper drum 12. The signal is transmitted through the conductive wire 17a to the rotary transformer 15 which is installed at the lower portion of the upper drum 12 from the substrate 16 and rotates again.

Therefore, the signal of the rotary transformer 15 being rotated is induced to the stator transformer 2 installed in the lower drum 1, and the signal of the stator transformer 2 is sent to a free amp (not shown).

The drum motor operated as described above is fixed apart from the head 14 through the substrate 16 installed on the upper surface of the upper drum 12 after the head 14 installed on the lower surface of the upper drum 12 reads a signal from the tape. In order to send a signal to the rotary transformer 15, the head 14 and the rotary transformer 15 are made of separate components, so that the circuit board 16 and the conductive wire 17a, ( It was connected using a separate mediator such as 17b).

However, the drum assembly and configuration are complicated by fixing the head and the rotary transformer as separate parts, and extremely small signals must be transmitted between the head and the rotary transformer. ) And noise caused to adversely affect the image quality and sound quality of the video tape recorder, and thus a problem of being a detrimental factor in the reliability and quality of the product occurred.

The present invention was devised to solve the above problems, and an object of the present invention is to simplify the assembly structure of the drum motor by directly fixing the rotary transformer and the head installed at the lower part of the upper drum and connecting the metal with high conductivity. At the same time, it can be miniaturized, and it is possible to improve the product quality and reliability by eliminating the generation of loss and noise in the extremely small signal sent from the head to the rotary transformer.

Features of the present invention for achieving the above object, the head is fixed to the bottom and the upper drum with a rotary transformer installed inside, the stator transformer is installed on the upper side and the lower drum is fixed to the lower portion, respectively In the drum motor of the video tape recorder mounted on the shaft, the head is fixed to the rotary transformer installed in the upper drum to be directly connected to the circuit, another feature of the present invention, the head and the rotary transformer When directly connected, it is plated by metal with high conductivity such as gold.

Hereinafter, with reference to the accompanying drawings, the configuration of the subject innovation in detail as follows.

2 is a cross-sectional view of the drum motor of the present invention, and FIG. 3 is a plan view and a cross-sectional view of a state in which a head is fixed to the rotary transformer of the present invention. The lower drum 1 is fixed to a drum base (not shown), and the lower drum ( A shaft 4 supported by the bearing 3 is formed through the center of 1), and the upper drum 12 and the motor unit 11 are disposed on the shaft 4 above and below the lower drum 1. It is fixedly installed.

A stator transformer 2 is installed in the lower drum 1, and a rotary transformer 15 is installed on the bottom of the upper drum 12 to correspond to the stator transformer 2 of the lower drum 1. The head 14 is fixed to the rotary transformer 15 and plated and connected to a metal having high conductivity, such as gold, and the boss 13 in the upper drum 12 is fixed to the shaft 4.

In addition, the motor unit 11 installed below the lower drum 1 has a rotor 7 having a magnet 6 attached to the shaft 4 and a fixed member 5 fixed thereto, and the lower drum 1 of The stator 10 in which the coil 9 is wound around the core 8 is screwed down.

According to the present invention, the rotor 7 is rotated by the interaction with the magnet 6 when a current is applied to the coil 9 wound around the core 8, and the shaft 4 is fixed to the rotor 7. Since the member 5 is fixed, the shaft 4 can rotate.

As the shaft 4 rotates, the lower drum 1 is fixed to the drum base so that the upper drum 12 is fixed to the shaft 4 by the boss 13 without being rotated. It is rotated by the rotary transformer 15 installed inside the upper drum 12 and the head 14 fixed to the rotary transformer 15.

Therefore, the head 14 is rotated and reads the signal of the conveyed tape to the rotary transformer 15, and the signal transmitted to the rotary transformer 15 is induced by the stator transformer 2 fixed to the lower drum 1. Is sent to the preamp.

As described above, according to the present invention, since the head 14 is directly fixed to the rotary transformer 15 and is connected to a metal having high conductivity, the head 14 reads the signal of the tape to be transferred, thereby rotating the rotary transformer 15. Loss and noise are not generated when sending it to), and the number of parts is reduced, the drum structure is simplified, and the drum size is reduced since it is directly connected without using an intermediate medium such as a conventional board and conductor. Will be able to achieve.

Therefore, as noise and loss are prevented between the head and the rotary transformer, and the structure is simplified, the assembly and productivity are increased, and the quality and quality of the product are improved by improving the image quality and sound quality.

Claims (2)

An upper drum 12 having a head 14 fixed to the bottom and a rotary transformer 15 installed therein, and a lower drum 1 having a stator transformer 2 installed above and a motor unit 11 fixed below. And a drum motor of a video tape recorder, each of which is arranged on a shaft (4), wherein the head (14) is fixed to the rotary transformer (15) installed in the upper drum (12) and is directly connected to the circuit. Drum motors of video tape recorders. The drum motor of a video tape recorder according to claim 1, wherein the head (14) and the rotary transformer (15) are plated and connected with a metal having high conductivity such as gold when the circuit is directly connected to the circuit.