JPH08249629A - Noncontact type power supply equipment - Google Patents

Abstract

PURPOSE: To supply power to an amplifier built in a rotary drum, in a non- contact and simple manner using light and a photoelectric conversion element and to ensure the reliability in the operation of equipment. CONSTITUTION: On the one end side in a part of a rotary drum 1 having an amplifier 8 built in, a circular solar cell 10 is provided as a photoelectric conversion element being circular around a rotating shaft 2 of this drum. A laser light irradiating part constituted of a prism 5 and a semiconductor laser 6 is provided, by a non-contact type structure, on an arm part 4 on the fixed side being opposed to a part in the circumferential direction of the solar cell.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum used in, for example, a VTR (video tape recorder), a DAT (digital audio tape recorder), etc., and particularly to an amplifier (hereinafter referred to as an amplifier) provided in this rotary drum. The present invention relates to a non-contact power supply device for supplying power from the outside.

[0002]

2. Description of the Related Art For example, in an apparatus for recording / reproducing using magnetic, magneto-optical, or light, a rotary head for recording / reproducing a recording medium is provided on a rotary drum, and the recording medium is attached to the rotary head. In this state, the rotary drum is rotated to record a signal on a recording medium or reproduce a recorded signal by a rotary head.

The rotary drum of such a recording / reproducing apparatus has a built-in head amplifier for amplifying a recording signal to a rotary head or a reproducing signal of a recording signal from the rotary head. .

The simplest way to supply power from the outside to the amplifier in such a rotary drum is to provide a slip ring on the end face portion of the rotary drum and to attach a power supply brush to the fixed side of the slip ring. A contact type structure of sliding contact has been widely used.

[0005]

However, in the above-mentioned contact type power supply device, there is a problem that the slip ring and the power supply brush are worn due to friction due to the rotation of the rotary drum, and the life is short. . Further, in such a structure, the slip ring and the power feeding brush are consumable items, which causes a cost increase.

In recent years, a non-contact type power supply device has been proposed in order to solve the above-mentioned contact type trouble. That is, in such a non-contact power supply device, a structure is known in which, for example, a light emitting element and a light receiving element such as a solar cell are used to eliminate the consumables due to the above-mentioned wear.

However, according to such a structure, there is a problem that the light receiving rate of the light receiving element such as a solar cell is low, and the power supply required for the amplifier cannot be supplied.
This was a problem in ensuring the reliability and performance of the device.

The present invention has been made in view of the above-mentioned circumstances, and when supplying power to an amplifier incorporated in a rotary drum, the generation of consumable items such as a conventional contact type power supply device is eliminated, Non-contact type power supply that can improve the reliability and performance of the device by improving the reliability and performance of the conventional non-contact type power supply device while eliminating the problem of lowering the light receiving rate in the conventional non-contact type power supply device. The purpose is to get the structure.

[0009]

In order to meet such demands, the non-contact type power supply device according to the present invention supplies a power to the amplifier built in the rotary drum, and a part of the rotary drum, for example, A photoelectric conversion element exhibiting a substantially circular disk shape having a high light receiving rate, for example, a disk-shaped solar cell, is provided at a portion around the rotation axis on one end side of the rotating drum, and a fixed side facing the photoelectric conversion element. The arm portion is provided with a laser light irradiation portion by a semiconductor laser for irradiating the solar cell with light.

[0010]

According to the present invention, when power is supplied to the amplifier incorporated in the rotary drum, the laser light from the semiconductor laser which constitutes the laser light irradiation unit provided on the fixed arm is provided on the rotary drum. By irradiating a substantially disk-shaped solar cell, which is a photoelectric conversion element, power can be externally supplied to the amplifier of the rotating drum.

At this time, a substantially disk-shaped solar cell is arranged with the rotary shaft of the rotary drum as the center, and a prism constituting the laser light irradiation section on the arm side is opposed to a part of the circumferential direction of the solar cell. Thus, the laser light from the semiconductor laser can be always received by the substantially disk-shaped solar cell regardless of the rotation of the rotary drum.

[0012]

1 to 3 show an embodiment of a non-contact type power supply device according to the present invention. In these figures, in this embodiment, a VTR (video tape recorder) or the like is used. The rotating drum portion of the rotating drum with a head will be described.

In these drawings, reference numeral 1 is a rotary drum, and 2 is a motor shaft for rotationally driving the rotary drum 1. Reference numeral 3 denotes a fixed side support drum which is rotatably supported relative to the motor shaft 2. The support drum 3 is arranged coaxially with the rotary drum 1. In addition,
Although not shown, a motor for driving the rotary drum 1 to rotate is disposed in the support drum 3.

Reference numeral 4 denotes an arm which is fixed to the support drum 3 and has its other end facing the end surface portion of the rotary drum 1 on the side opposite to the support drum 3. A prism 5 and a semiconductor laser 6 are mounted as a laser light irradiating portion on a portion of the arm 4 facing the end surface portion of the rotary drum 1. That is, the semiconductor laser 6 is provided in a part of the arm 4, and the laser light from the semiconductor laser 6 is passed through the prism 5 provided in the arm 4 from the irradiation port 5a to the solar cell to be described later on the rotary drum 1 side. It is designed to irradiate toward.

On the other hand, a head 7 for recording / reproducing a recording medium (not shown) is provided on the outer periphery of the rotary drum 1, and the support drum 3 of the rotary drum 1 is provided.
An amplifier 8 for amplifying a recording / reproducing signal to / from the head 7 is provided in a concave portion 1a formed in a concave portion on an end surface portion on the opposite side.

Reference numeral 9 denotes a light receiving circuit arranged in the concave portion 1a of the rotary drum 1 together with the amplifier 8, and 10 denotes an annular plate as a substantially disk-shaped photoelectric conversion element arranged above the light receiving circuit 9. It is a shaped solar cell.

Here, the annular plate-shaped solar cell 10 is used.
Are arranged concentrically on the light receiving circuit 9 provided in the concave portion 1a of the rotary drum 1 about the rotation axis of the motor shaft 2 of the drum 1. The other end of the arm 4 faces a part of the annular plate-shaped solar cell 10 in the circumferential direction,
The solar cell 10 can be irradiated with the laser light from the semiconductor laser 6 in the arm 4 by the prism 5 and the irradiation port 5a provided in this portion.

In such a structure, the laser light emitted from the semiconductor laser 6 by power supply from the outside is applied to the solar cell 10 on the rotary drum 1 side through the prism 5 and the irradiation port 5a, whereby the laser light is emitted. Is electrically converted by a light receiving circuit 9, and this is supplied as a power source for an amplifier 8 for the head of the rotary drum 1.

At this time, the annular plate-shaped solar cell 10 is
The semiconductor laser 6 is arranged regardless of the rotation of the rotary drum 1 because the prism 5 on the arm 4 side and the irradiation port 5a are disposed so as to face a part of the rotary drum 1 around the rotary shaft. The laser light from the can be always received by the solar cell 10, and the light receiving rate can be improved. In this embodiment, the arm 4 is provided with a prism 5 as a laser light irradiation unit, and the prism 5 irradiates the laser light from the semiconductor laser 6 toward the annular plate-shaped solar cell 10. However, the laser light from the semiconductor laser 6 may be directly applied to the annular plate-shaped solar cell 10 provided on the rotating drum 1 side.

Here, FIG. 3 is a system diagram of an external power supply device for the amplifier 8 built in the rotary drum 1 described above. That is, an external power supply is connected to the semiconductor laser 6 that constitutes the laser light irradiation section, and electricity is selectively supplied to this to convert electricity into light and obtain laser light. This laser light is emitted from the irradiation port 5a through the prism 5 of the arm 4,
By irradiating a circular plate-shaped solar cell, which is a disk-shaped photoelectric conversion element, and converting light into electricity by the light receiving circuit 9, the power source for the amplifier 8 can be supplied to the rotating drum 1 side. Then, the power supplied to the light receiving circuit 9 can be supplied to the amplifier 8 as a power through a rectifying unit as shown in FIG.

With such a structure, the amplifier 8 mounted in the rotary drum 1 can be supplied with power in a non-contact state by irradiating the amplifier 8 with laser light. The contact type slip ring that supplies power via the slip ring and the power feeding brush does not wear due to friction due to the rotation of the rotating drum, and it is possible to prevent the generation of consumables due to worn parts. Further, an annular plate-shaped solar cell 10 that receives laser light on the rotating drum 1 side is used, and is arranged concentrically around the rotation axis, so that the laser light is always received when the rotating drum 1 rotates. You can do it in a stable state,
There is an advantage that the light receiving rate is improved.

Here, in the above-mentioned configuration, the laser light from the semiconductor laser 6 provided in the arm 4 is simply deflected by the prism 5 and concentrated and applied to the solar cell 10 on the rotary drum 1 side. However, for example, this prism 5
May be provided with a light diffusing function so that the laser light can be applied to the solar cell 10 so as to spread in the surface direction. By doing so, the area where the solar cell 10 can receive light is widened, and the light receiving rate of the solar cell 10 as a whole is improved.

It is needless to say that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part constituting the rotary drum part can be appropriately modified or changed. For example, in the above-described embodiment, the annular plate-shaped solar cell 10 is used as the photoelectric conversion element having a substantially disk shape, but the shape can be appropriately modified, and the point is that the rotation drum 1 rotates regardless of rotation. Any shape may be used as long as it can always receive the laser light from the semiconductor laser 6.

Further, in the above-mentioned embodiment, the laser beam from the semiconductor laser 6 is provided in the prism 5 inside the arm 4.
Although the direction is deflected via the irradiation port 5a to irradiate the solar cell 10 side from the irradiation port 5a, the invention is not limited to this, and the laser light from the semiconductor laser 6 is directly irradiated to the solar cell 10 side. You may. Further, it goes without saying that the device to which the non-contact power supply device according to the present invention is applied is not limited to the rotating drum part of the VTR.

[0025]

As described above, according to the non-contact type power supply device of the present invention, the semiconductor provided on the fixed side arm portion in the photoelectric conversion element by the substantially disk-shaped solar cell provided on the rotating drum. Since the irradiation parts such as prisms for irradiating the laser light generated by the laser are opposed to each other, even though the structure is simple, the laser light is used to supply power from the outside to the amplifier built into the rotating drum. The non-contact type structure that utilizes the contact type can be adopted, the wear parts as in the case of using the conventional contact type slip ring and brush are eliminated, the generation of consumables is prevented, and the life of each part of the device is extended. Therefore, the cost can be reduced.

In particular, according to the present invention, a substantially disk-shaped solar cell as a substantially disk-shaped photoelectric conversion element is arranged on one end side of the rotating drum with the rotation shaft as the center, and the fixed side thereof is provided. Since the laser light irradiation parts of the arms of are opposed to each other, it is possible to improve the light reception rate of the laser light from the semiconductor laser by the solar cell regardless of the rotation of the rotary drum. The light can always be received efficiently, and as a result, the reliability and performance of the device can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a main part of a rotary drum unit, showing an embodiment of a non-contact type power supply device according to the present invention.

FIG. 2 is a plan view of the rotary drum unit shown in FIG.

FIG. 3 is a system diagram of a power supply system showing an embodiment of a non-contact type power supply device according to the present invention.

[Explanation of symbols]

1 ... Rotating drum, 2 ... Motor shaft (rotating shaft), 3 ... Support drum, 4 ... Arm (fixed arm part), 5 ... Prism,
5a ... Irradiation port, 6 ... Semiconductor laser (laser light irradiation section),
7 ... Head, 8 ... Amplifier (amplifier), 9 ... Light receiving circuit, 1
0 ... A substantially disk-shaped solar cell (photoelectric conversion element).

Claims (3)

[Claims] 1. A power supply device for supplying power to an amplifier built in a rotary drum, wherein a photoelectric conversion element having a substantially disk shape is provided in a part of the rotary drum, and a fixed side facing the photoelectric conversion element. A non-contact type power supply device, characterized in that a laser light irradiating section by a semiconductor laser is provided on the arm section of the. 2. The non-contact type power supply device according to claim 1, wherein a substantially disk-shaped solar cell is used as the photoelectric conversion element, and the solar cell is centered around the rotation shaft on one end side of the rotating drum. A non-contact type power supply device characterized by being provided. 3. The non-contact type power supply device according to claim 1 or 2, wherein a laser beam from a semiconductor laser that constitutes a laser beam irradiating section is provided in a fixed side arm section on a rotating drum side. A non-contact type power supply device, characterized in that a prism for irradiating the same is provided.