KR930002270Y1 - Signal trans device for rotary head drum - Google Patents

Abstract

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Description

Signal transmission device of rotating head drum

1 is a longitudinal sectional view showing the configuration of a conventional rotating head drum.

FIG. 2 is a bottom view of the upper cylinder of FIG. 1. FIG.

3 is a plan view of the lower cylinder of FIG.

Figure 4 is a longitudinal sectional view showing the configuration of the rotating head drum according to the present invention.

5 is a bottom exploded perspective view showing the main configuration of the rotating head drum according to the present invention.

6 is a bottom view of the upper cylinder of FIG.

Figure 7 is a partially enlarged cross-sectional view showing a signal transmission device of the rotating head drum according to the present invention.

* Explanation of symbols for main parts of the drawings

4: lower cylinder 8: upper cylinder

31: fixed transformer 32: rotating transformer

33: printed wiring board 34: disc relay

34a, 34b: terminal

The present invention relates to a signal transmission device of a rotating head drum in a magnetic recording and reproducing apparatus such as a V-Cal and a digital audio tape recorder, and in particular, it is possible to transmit a signal using only one disc relay. The present invention relates to a signal transmission device of a rotating head drum that simplifies assembly and reduces noise to obtain a better picture and sound quality.

The signal transmission device of the conventional rotary head drum is coupled to the lower cylinder (4) in the middle portion of the rotating shaft (1) under the description of the upper and lower bearings (2) (3), as shown in FIGS. A fixed transformer 5 is fixed to the bottom surface of the lower cylinder 4, a flange 6 is press-fitted and fixed to an upper portion of the rotating shaft 1, and a fixed transformer ( The rotation transformer 7 is fixed at a predetermined interval with 5).

The upper cylinder (8) is inserted into the upper end of the rotary shaft (1), the upper cylinder (8) is fixed to the flange (6) with a fixing screw (9) to rotate the rotation shaft (1) and the flange (6) It is designed to be rotatable together.

As shown in FIG. 2, two or four head bases 10 are fixed to the lower surface of the upper cylinder 8 by fixing screws 11, and a connection hole 12a is formed at one side of the head base 10. Leg Relays 12 are formed, respectively, and the Leg Relays 12 are fixed to the head base 10 by the conductive wires 13.

A disc relay 14 is fixed to an upper surface of the rotary transformer 7, and a plurality of connections inserted into a connection hole 12a of the leg relay 12 are fixed to a predetermined portion of the disc relay 14. The pin 15 is fixed.

The damper 16 is fixed to the upper surface of the upper cylinder 8 by a fixing screw 17.

In addition, the motor unit 18 is fixed to the lower portion of the rotary shaft 1, the motor unit 18 is a stator 20 which is fixed to the lower cylinder 4 by a fixing screw 19, and the rotary shaft ( The rotor 22 is fixed to the bracket 21 fixed to the lower part of 1) at fixed intervals with the stator 20.

In the drawings, reference numeral 23 is a head, 24 is a set screw, 25 is a ring collar, 26 is a fixing screw, 27 is a set screw, 28 is a shield case, and 29 is a washer.

In the conventional rotary head drum as described above, the tape signal read by the head 23 is the leg relay 12 → disc relay 14 → rotation transformer 7 → fixed transformer 5 → pre-amp (PRE-AMP). Is delivered to.

However, according to the related art as described above, although the intermediate terminal must be reduced to the minimum for the signal transmission of the head 23, the generation of noise can be reduced, but the two intermediate parts of the leg relay 12 and the disc relay 14 are reduced. By using the terminal, there was a disadvantage in that noise was generated in the signal, and interference with the head base 10 occurred during the assembling work of the leg relay 12 and the disc relay 14, thereby correcting the head base 10. Not only the position is displaced, but also a step problem with other parts occurs, and the amount of protrusion of the head base 10 is changed, so that the upper skew, the RF output terminal, and the jitter during the reproduction of the standard tape and the self-recording reproduction. There are various problems such as a failure such as a wow / flutter, and an assembly process is not easy and frictional scratches of the upper cylinder 8 and the lower cylinder 4 occur.

The present invention is devised to solve the conventional problems as described above, by fixing the disk relay on the lower surface of the upper cylinder so that the signal of the head is directly transmitted to the rotation transformer and the fixed transformer through the disk relay to simplify the configuration At the same time to improve the work efficiency and to reduce the production cost, to reduce the noise to be configured to obtain a higher quality screen and sound quality, the present invention will be described in detail by the accompanying drawings as follows.

As shown in FIGS. 4 to 7, a lower cylinder 4 is coupled to an intermediate portion of the rotating shaft 1 through the upper and lower bearings 2 and 3, and an upper portion of the rotating shaft 1. A flange 4 'is fixed to the upper cylinder 8 in which several head bases 10 are fixed to the flange 4', and a motor 18 is disposed below the rotating shaft 1. In the rotating head drum is installed, the cylindrical fixed transformer (13) is erected and fixed to the bottom surface of the lower cylinder (4), the fixed transformer 31 and the inner recessed portion (8a) of the upper cylinder (8) A cylindrical rotary transformer 32 is erected and fixed so as to maintain a predetermined interval, and an annular printed wiring board 33 is fixed to the lower surface of the rotary transformer 32, and a disc relay is mounted on a lower surface of the upper cylinder 8. 34 is fixed, but one terminal 34a of the disc relay 34 is fixed to the head base 10 while the other terminal 34b is printed Be constituted by a soldered wire substrate 33, it has the same reference marks with respect to the same parts as those of the prior art configuration.

Referring to the assembly process of the rotating head drum according to the present invention is configured as described above are as follows.

First, several head bases 10 on which the head 23 is fixed to the lower surface of the upper cylinder 8 are fixed with the fixing screw 11, and then 90 ° of the head base 10 is adjusted using a head position adjuster. After adjusting the 180 ° position and the amount of protrusion, attaching and fixing the rotary transformer 32 in a state where an adhesive is applied to the inner recess 8a of the upper cylinder 80, the outer peripheral surface of the rotary transformer 32 is fixed. The disc relay 34 with the printed wiring board 33 inserted therein is fixed to the lower surface of the upper cylinder 8, and the terminals 34a and 34b of the disc relay 34 are fixed to the head base 10. And soldered to the printed wiring board 33, and then, the terminals of the head base 10 are adjusted to form an upper cylinder assembly as shown in FIG.

In addition, the upper cylinder and the lower bearing (2) (3) are press-fitted into the lower cylinder (4), and then the fixed transformer (31) is adhesively fixed and the flange (4) is mounted on the upper and lower bearing (2) (3). After coupling the rotary shaft (1) press-fitted, assembles the ring collar 25 and the washer 29, and tightens the screws (27) to the ring collar 25 to form a lower cylinder assembly.

Thereafter, the upper cylinder 8 is coupled to the rotating shaft 1 of the lower cylinder 4 to be fixed by the fixing screw 9, and the damper 16 is fixed to the upper cylinder 8 by the fixing screw 17. Fixing the stator 20 to the lower cylinder 4 with the fixing screw 19, and fixing the bracket 21 to which the rotor 22 is fixed to the ring collar 25 with the fixing screw 26. Then, by assembling the shield case 28 to the lower cylinder 4, the rotating head drum of the present invention shown in Figure 4 is assembled.

The rotating head drum according to the present invention can minimize the noise phenomenon because the signal read by the head 23 is transmitted to the disc relay 34 → rotating transformer 32 → fixed transformer 31 → preamplifier. .

That is, when the signal is transmitted in the above-described step, the amplification of the signal is made, and when the noise is mixed, it is amplified like the signal. According to the related art, the second stage intermediate terminal of the second relay and the disc relay is used. Since the amplification amount of the noise is increased, it is impossible to obtain a good image or sound quality. However, in the rotating head drum of the present invention, the signal is transmitted in a simpler system in which one intermediate terminal of the disc relay 34 is passed. As a result, the amount of noise can be greatly reduced, resulting in a cleaner image and sound quality.

As described above, the present invention not only obtains a better picture and sound quality by reducing noise by simplifying the signal transmission system, but also has the advantage of simplifying the operation and reducing the production cost by simplifying the configuration. As the upper and lower cylinders are not interfered with the head base during assembly, the head base can be prevented from stepping and the 90 and 180 degree positions and the amount of protrusion can be precisely adjusted. It prevents phenomenon such as output terminal, jitter, wow / platter, and prevents friction damage between upper and lower cylinders.

Claims (3)

The disk relay 34 is fixed to the lower surface of the upper cylinder 8 so that the signal from the head 23 is configured to be transmitted to the rotation transformer 32 and the fixed transformer 31 through the disk relay 34. Signal transmission device for rotating head drum. According to claim 1, wherein the rotary transformer 32 and the fixed transformer 31 is cylindrical, characterized in that fixed to maintain a predetermined interval on the upper and lower surfaces of the upper cylinder 8 and the lower cylinder (4). Signal transmission device of rotating head drum 3. The printed wiring board 33 is fixed to the lower surface of the rotary transformer 32, and the other terminal 34b of the disc relay 34 is fixed to the printed wiring board 33. And signal transmission device of the rotating head drum, characterized in that the one side terminal (34a) is fixed to the head base (10).