JPS6254802A - Rotary magnetic head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To avoid spark from being generated by immersing each shaft insulated together to a conductive liquid tank and applying a power supply to a head amplifier via the conductive liquid tank. CONSTITUTION:Electrical connection is applied via the contact between the conductive liquid 18 of the conductive liquid tanks 16A, 16B and shaft 2A, 2B. The shaft 2 is divided into the upper shaft 2A being the 1st shaft and the lower shaft 2B being the 2nd shaft by an insulation layer 15 provided at the mid-part. A gap between an opening 171A of a case 17A and the upper shaft 2A is slight and the liquid is not leaked externally by the surface tension of the liquid 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating magnetic head type magnetic recording/reproducing device, particularly to an improvement in power supply means for a head amplifier.

[Conventional technology]

FIG. 5 shows a schematic configuration of a conventional device of this type.

In this figure, (1) is a fixed drum, (2) is a shaft supported by the fixed drum via a bearing (3), and (4) is a motor that drives the shaft, and the rotor (
4A) is fixed to the shaft (2), and the stator (4B
) is fixed to the fixed drum (1). (5) is an end ring attached to the lower end of the shaft to prevent the shaft (2) from falling off. (6) is a 7 lange fixed to the middle part of the shaft, (7) is a rotating drum fixed to the flange, (8
) is a head mounted on the rotating drum, and is positioned on the outer peripheral surface of the rotating drum in order to accommodate a tape-shaped recording medium (not shown). (9) is a rotary transformer connected to the head amplifier (10) that amplifies the output from the head;
It consists of a rotating side (OA) and a rotating side (IOB).

(Vcc) is the power supply for the head amplifier, which is connected to the power supply line (13) of the head amplifier via the slip ring (IIA) connected to the shaft (2) and the brush (12A) in sliding contact with the slip ring (IIA). . t (14) is a grounding wire for the head amplifier, which is grounded via a slip ring (IIB) and a brush (12B).

Next, the operation will be explained.

By driving the motor (4), the rotating drum (7)
When the head (8) rotates about the shaft (2) with respect to the fixed drum (1), the head (8) interlinks with the magnetic flux from the magnetic tape (not shown), so that a reproduction voltage is generated. This reproduction voltage is input to the head amplifier (9) and is
Q dB amplified. The output voltage is transmitted to the fixed drum (IOA) side by electromagnetic coupling between the rotary transformer (10A) and (IOB), and then supplied to the playback signal processing circuit to obtain a playback signal such as video, audio, or data. It is something.

At this time, power to the head amplifier (9) is supplied from the power supply (Vo) through the brush (12A) and the slip ring (IIA), and the power is supplied from the power supply (Vo) through the brush (12A) and the slip ring (IIA).
2B).

[Problem that the invention seeks to solve]

Conventional devices are configured as described above, and power is supplied to the head amplifier via brushes and slip rings, so when used for long periods of time, the brushes and slip rings wear out and need to be replaced. . Another problem was that minute sparks were generated at the contact between the brush and the slip ring, which turned into noise and degraded the reproduced signal.

The present invention has been made to solve these problems, and it is an object of the present invention to provide a device that includes a power supply means that does not have mechanical contact parts.

[Means for solving problems]

The device of the present invention is composed of first and second shaft portions that are insulated from each other, and is provided with a conductive liquid tank in which each of the shaft portions is immersed,
Power to the head amplifier is supplied through the conductive liquid tank.

[Function] In this invention, power is supplied to the head amplifier via the conductive liquid tank and the shaft immersed in the conductive liquid tank, and since there is no mechanical contact part, it can be used for a long time without wear. , and does not generate sparks.

[Embodiments of the invention]

An embodiment of the present invention shown in FIG. 1 will be described below.

In this figure, (2) is the shaft, which is divided into an upper shaft (2A), which is the first shaft part, and a lower shaft (2B), which is the second shaft part, by an insulating layer (15) provided in the middle part. and each shaft (2A), (2B
) are electrically isolated. Such a shaft is
For example, it can be formed by bonding two cylindrical conductors using an insulating adhesive. (16A) and (16
B) is a conductive liquid tank provided corresponding to the upper shaft (2 persons) and lower shaft (2B), respectively, and the detailed structure of each and the relationship with the shafts are shown in Fig. 2. There is. Although FIG. 2 shows the upper conductive liquid tank (16A) in FIG. 1, the lower conductive liquid tank (16B) is similarly constructed. That is, (17A) is a housing of a liquid tank, and a conductive liquid (18) such as mercury is stored inside the housing. (2A) is the upper end of the upper shaft (2A), which is the upper end of the housing (1
7A) into the casing through the opening (171A) provided on the lower side, and is immersed in the conductive liquid (18). The gap between the opening (171A) of the housing (17A) and the upper shaft (2A) is small, and the liquid (18
) to prevent leakage to the outside due to surface tension. Further, (13) is a power line of the head amplifier (9) connected to the upper shirt (2A).

(14) is a grounding wire of the head amplifier (9) connected to the lower shaft (2B). (19) is the power supply (vCC)
and the conductive liquid (18) of the upper conductive liquid tank (16A), and (20) is an electric wire that connects the conductive liquid (18) of the lower conductive liquid tank (16B) to the ground.

The rest of the configuration is the same as the conventional one, so the explanation will be omitted.

This embodiment is constructed as described above, and has a conductive liquid tank (16A
), (16B) conductive liquid (18) and shirt) (2A),
Electrical connection is made through contact with (2B), and since there is no mechanical contact unlike in the conventional case, a very good conductive relationship can be ensured. Further, FIG. 3 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. 1 in the structure of the shaft and the relationship between the shaft and the conductive liquid tank. In FIG. 3, (2C) is a first shaft portion configured as a hollow shaft, (2D) is a second shaft portion configured as a normal shaft body, and (2C) is a second shaft portion configured as a normal shaft body.
), and an insulating member (21) is interposed in the gap between both shaft parts (2C) and (2D).

FIG. 4 schematically shows the above structure and the relationship between each shaft portion and the conductive liquid tank in an enlarged manner. In addition, the fourth
In the figure, the upper part of the shaft is shown in a perspective view, and the lower part is shown in a sectional view. (22A) is a conductive liquid tank in which the first shaft portion (2C) is immersed, and since the first shaft portion (2C) is configured as a hollow shaft, it is configured in a donut shape as shown in Fig. 4. has been done. Also,
(22B) is a conductive liquid tank in which the lower end of the second shaft portion (2D) is immersed.

The power supply (vCC) for the head amplifier is supplied from the conductive liquid tank (
22B), and the power supply line (13) of the head amplifier is connected to the second shaft portion (2D). A grounding line (14) of the head amplifier is connected to the first shaft part (2C) and is grounded via a conductive liquid tank (22A) connected thereto. The rest of the configuration is the same as that of the embodiment shown in FIG. 1, so a description thereof will be omitted.

In addition, in each of the above-mentioned embodiments, if a material with a high dielectric constant is used for the insulating member and the shaft connected to the power line, the conductive liquid, or both have a resistance of about 1 to 100 Ω, the power filter is configured. I can do it,
The head amp can be operated stably.

In addition, although a conductive metal such as mercury that is liquid at room temperature is used as an example of the conductive liquid contained in the conductive liquid tank, it goes without saying that a conductive ionic solution or a conductive colloid solution may also be used. .

In addition, similar effects can be expected by incorporating conductive metal powder or carbon powder.

〔Effect of the invention〕

Since the present invention is constructed as described above, it will not wear out even if used for a long time and will not generate sparks. As a result, a good reproduced signal can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the relationship between the shaft and the conductive liquid tank in the above embodiment, and Fig. 3 is another embodiment of the invention. FIG. 4 is an enlarged sectional view showing the relationship between the structure of the shaft and the conductive liquid tank in the other embodiment, and FIG. 5 is a schematic diagram showing the conventional structure. In the figure, (1) is a fixed drum, (2) is a shaft, (4) is a motor, (6) is a flange, (7) is a rotating drum, (8) is a
) is the head, (9) is the head amplifier, (10) is the rotary transformer, (IIA), (IIB) are the slip rings, (12A), (12B) are the brushes, (15) is the insulation layer, (2 people) is the upper shaft, (2B) is the lower shaft, (16A), (16B). (22A), (22B) are conductive liquid tanks, (2C) are hollow first shaft parts, (2D) are second shaft parts, (2
1) is an insulating member. Note that the same reference numerals indicate the same or matching parts, respectively. Agent Patent Attorney Masuo Oiwa No. 1 Figure 2 Leap Figure 3 Figure 4 Figure 5M Procedural amendment (self-defense) 2.Q ITJI (7) Name Rotating head type magnetic recording and reproducing device 3, amendment 5. Claims column of the specification to be amended Specification 4. Detailed explanation of the invention column Brief explanation of aspects of the specification Discontinued content (1) Patent claims in the specification Correct the range as shown in the attached sheet 0 (Insert ``mounted on a rotating drum'' after ``particularly'' in line 15 of page 3 of the 2nd specification. ``This type of device'' in line 18 of page 3 of the same specification) amended to "1 position of this type". Insert "," after "head amplifier" in line 12 of page 4. Change "electromagnetic coupling" to "magnetic coupling" in line 11 of page 5. Correct. Insert "," next to "Results of wear" on page 6, line 3. Lines 2 to 3 of page 12 [(2) is shaft, (4)
" is a motor," is corrected to "r (2) is a shaft, (3) is a bearing, (4) is a motor, (■ is an end ring,").Claims (1) A fixed drum rotatably mounted. A supported shaft, a rotating drum coupled to the shaft and having a head mounted thereon, and a head amplifier mounted on the rotating drum and connected to the head,
The shaft is composed of first and second shaft parts that are insulated from each other, and a conductive liquid tank is provided in which each of the shaft parts is immersed, and a power source for the head amplifier is supplied through the conductive liquid tank. A rotating magnetic head type magnetic recording/reproducing device characterized in that: (2) A rotating magnetic head type magnetic recording/reproducing device according to claim 1, wherein the first and second shaft portions are integrally coupled in the longitudinal direction via an insulating member. (3) The first shaft part is hollow and the second shaft part has a concentric structure passing through the first shaft part, and an insulating member is interposed in the gap between the two shaft parts. A rotating magnetic head type magnetic recording/reproducing device according to claim 1. (4) Appropriate resistance is provided in one or both of the first or second shaft portion connected to the power source of the head amplifier, or the conductive liquid tank connected to this shaft portion. Claims 1 to 3
The rotating magnetic head type magnetic recording and reproducing device according to any one of the items. (8) The conductive liquid contained in the conductive liquid tank is a conductive metal that is liquid at room temperature.
The rotating magnetic head type magnetic recording/reproducing device according to any one of Item 4. (6) The rotating magnetic head type magnetic recording/reproducing device 0 according to any one of claims 1 to 4, wherein the conductive liquid is a conductive ionic solution. (7) The conductive liquid is a conductive ionic solution. 5. The rotating magnetic head type magnetic recording and reproducing device according to claim 1, wherein the magnetic recording and reproducing device is a magnetic colloid solution. (8) A rotating magnetic head type magnetic recording/reproducing device according to any one of claims 1 to 4, wherein the conductive liquid contains conductive metal powder. (9) A rotating magnetic head type magnetic recording/reproducing device according to any one of claims 1 to 4, wherein the conductive liquid contains carbon powder.

Claims (9)

[Claims] (1) A shaft rotatably supported by a fixed drum, a rotating drum coupled to the shaft and having a head attached thereto, and a head amplifier attached to the rotating drum and connected to the head. , the shaft is constituted by first and second shaft parts that are insulated from each other, and a conductive liquid tank is provided in which each of the shaft parts is immersed, and a power source for the head amplifier is supplied through the conductive liquid tank. What is claimed is: 1. A rotating magnetic head type magnetic recording/reproducing device, characterized in that the magnetic recording/reproducing device is supplied with a rotating magnetic head. (2) A rotating magnetic head type magnetic recording/reproducing device according to claim 1, wherein the first and second shaft portions are integrally coupled in the longitudinal direction via an insulating member. (3) The first shaft part is a hollow shaft, the second shaft part has a concentric structure passing through the first shaft part, and an insulating member is interposed in the gap between the two shaft parts. A rotating magnetic head type magnetic recording and reproducing device according to claim 1. (4) The first or second connected to the power supply of the head amplifier
According to any one of claims 1 to 3, the shaft portion and/or both of the conductive liquid tank connected to the shaft portion are provided with an appropriate resistance. A rotating magnetic head type magnetic recording and reproducing device. (5) The conductive liquid contained in the conductive liquid tank is a conductive metal that is liquid at room temperature.
The rotating magnetic head type magnetic recording/reproducing device according to any one of Item 3. (6) A rotating magnetic head type magnetic recording/reproducing device according to any one of claims 1 to 3, wherein the conductive liquid is a conductive ionic solution. (7) The rotating magnetic head type magnetic recording and reproducing device according to any one of claims 1 to 3, wherein the conductive liquid is a conductive colloid solution. (8) A rotating magnetic head type magnetic recording/reproducing device according to any one of claims 1 to 3, wherein the conductive liquid contains conductive metal powder. (9) A rotating magnetic head type magnetic recording/reproducing device according to any one of claims 1 to 3, wherein the conductive liquid contains carbon powder.