JPS59151305A - Rotary head cylinder device - Google Patents

Abstract

PURPOSE:To utilize an electromotive force generated in a coil when a rotary drum is rotated as a power supply of an electronic circuit on the rotary drum by providing the coil to a rotary drum side and arranging a magnet to a fixed drum so as to oppose to said coil. CONSTITUTION:In a figure, 12 is an electronic circuit section including an electronic circuit and a power supply circuit, mounted on the rotary drum 10 together with the coil 4 and rotated incorporatedly. In the figure, 7 is a magnetic core of a rotary transformer and also used in common with the magnetic core of the coil 4. In the figure, 7a, 7b are windings of the rotary transformer and connected to the electronic circuit section 21 by leads 13. The coil is connected similarly to the electronic circuit section 12. Further, the fixed drum 11 is fixed to a chassis. The rotation of a drive motor is delivered to a pulley 14 and the rotary drum 10 is rotated incorporatedly together with a main shaft 14. Then, the coil 4 is also rotated, an electromotive force is generated by a magnetic field of the magnet 5, rectified and smoothed in the power supply circuit in the electronic circuit section 12 and applied to each circuit as the power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head cylinder device for a video tape recorder.

Conventional structure and its problems Conventionally, magnetic tape 2...
- In order to record or reproduce signals on the jeep, as shown in FIG. 1, a rotary transformer T1. T2. Tn
1 to the recording signal amplification circuit R or the reproduction signal amplification circuit on the fixed drum side through i. A2゜mmn and rotating magnetic head H
Signals are exchanged between H1, H2, and Hn. Sl
,, 82. Sn and So are recording/reproduction switching switches, and the recording/reproduction switching circuit 3 supplies a power supply voltage to the recording signal amplification circuit Rm during recording, and the output side of the recording signal amplification circuit Rm is connected to a rotary transformer T1. T2
．． Tn, and during reproduction, power supply voltage is supplied to the reproduced signal amplification circuit Al, 12゜n, and the rotation transformer T1. T2. The head switching circuit 1 connected to Tn switches the reproduction output from each rotating magnetic head during reproduction.

That is, a plurality of rotating magnetic heads and only one side of a rotating transformer are mounted on the rotating drum, and signal processing such as switching and amplifying recording/reproducing signals is performed on the fixed side via the rotating transformer.

However, in order to realize special playback or long-time recording, the number of rotating magnetic spatulas increases by 1.
In the conventional configuration of the recording/reproducing system of a rotary magnetic head, there is a one-to-one correspondence between the CJl, the rotary magnetic head and the rotary lance. This has the drawback of increasing the size of the rotating lance and increasing costs, and furthermore, the single-format video chief unit requires fangs, and even cylinders. Because the diameter of the channel is fixed, it is not possible to easily increase the number of channels.For example, even if the number of channels is increased within the allowable range, there will be problems such as cost increase due to the difference between adjacent channels. Therefore, TLB damage to the video signal cannot be eliminated.

Therefore, a method can be considered to mount the electronic circuit on the fixed side (/) on the rotating drum, but in this case, it is necessary to secure the power supply for the electronic circuit.

Purpose of Investigation The purpose of the present invention is to solve the above problems.
・Increased Lance's number of channels and Talostalk by 4
To arbitrarily increase the number of C to rotating magnetism without I (
[The present invention provides a rotating head cylinder device that can supply power to the electronic circuit without contact by installing an electronic circuit on the rotating drum.

Structure of the Invention The rotary head cylinder device of the present invention is equipped with a coil on the rotating drum side and a magnet arranged on the stationary drum side so as to face the coil. This electromotive force is used as a power source for the rotating drone and the electronic circuits above.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention. This is a rotating magnetic head H1゜H2, Hn on a rotating drum.
In addition to the recording signal amplification circuit RA, the reproduction signal amplification circuit AI, A2. An, changeover switch So, S1. S
2. Sn, SW1, a recording/reproduction switching circuit 3, a head switching circuit 1, which controls them. It has a configuration in which the power supply circuit 2 and coil 4 are mounted on the entire tower, and the number of channels of the rotating transformer is 2. An annular magnet 5 is arranged on the fixed side facing the coil 4.

FIG. 3 is a sectional view showing two specific examples of the rotary head cylinder device according to the present invention. In the figure, reference numeral 12 denotes an electronic circuit section including the above-mentioned electric f circuit and power supply circuit, which is mounted together with the coil 4 on the rotating drum 1o, and rotates as a unit. 7 is the magnetic core of the rotating transformer, which also serves as the magnetic core of the coil 4. It is better to set this separately. 7a.

Reference numeral 7b denotes a winding of a co-rotating transformer, which is connected to the power P circuit section 12 through a conductive wire 13. Coil 4 is also connected to electronic circuit section 12 in the same way. Still, the stationary drum 11 is fixed to a chassis (not shown).

The rotation of the drive motor (not shown) is controlled by the pulley 14 [
As a result, the rotating drum 10 rotates together with the main shaft 15. Then, coil 4 also rotates 1y% magnet 5
An electromotive force is generated by the magnetic field, and after being rectified and smoothed by the power supply circuit 2 in the electronic circuit section 12, it is supplied as power to each circuit 618-2. The output of the control signal circuit 6 that switches between recording and playback is the rotary transformer T2.
i to the recording/reproduction switching circuit 3 through the switching switches So, S1, 82 . Sn and SW1'fr: When recording, the recording signal is transferred to the changeover switch SW2,
After passing through the synchronizing transformer T1 and the changeover switch SW1, and being amplified by the recording signal amplification circuit RA, the changeover switch 81. It is supplied to the rotating magnetic heads H1, H2, and Hn via S2°Snf. On the other hand, during reproduction, the rotating magnetic head H1, H2, Hn (7) signals are transferred to the changeover switches S1, S2, . Reproduction signal amplification circuit via Sn, A1. After being amplified by A2+An, it becomes a reproduction signal through the head switching circuit 1, the changeover switch SW+, the rotary transformer T1, and the changeover switch sw2'l diameter.

FIGS. 4(a) and 4(b) show sketches of the coil 4 and magnet 6 separately. Note that in this example, coil 4
Although the rotary transformer and the rotary transformer are integrated, they may be configured separately.

In addition, in this embodiment, both the amplification circuits for the recording and reproduction signals are mounted on the rotating drum, but there may be cases where only the reproduction signal amplification circuit is mounted on the rotating drum, or when a flying signal is mounted on the rotating drum. A similar configuration is also possible when an erase oscillation circuit or the like is further mounted.

Effects of the Invention As described above, the present invention provides a coil on a rotating drum, a magnet on a stationary drum facing the coil, and rotating the rotating drum to reduce the electromotive force 'f generated in the coil: By using it as an operating power source for electronic circuits such as amplifier circuits installed on the rotating drum, it can be used as an operating power source for electronic circuits such as amplifier circuits installed on the rotating drum.
0, which has the excellent advantage of being able to handle the problem without increasing the number of channels in the rotary transformer.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a recording/reproducing system of a conventional rotating magnetic head cylinder device, FIG. 2 is a circuit diagram of a recording/reproducing system of a rotating magnetic head cylinder device according to an embodiment of the present invention, and FIG. 3 is a circuit diagram of a recording/reproducing system of a conventional rotating magnetic head cylinder device. Cross-sectional view of a specific embodiment of the invention, FIG. 4 (IL)
, (b) is a partial perspective view of a coil and a magnet in the embodiment of the present invention. Hl, H2, Hn - old - rotating magnetic head, 1°""
” Head switching circuit, 2... Power supply circuit, 3.
... Recording/reproduction switching circuit, 4... Coil, 5. Old... Magnet, 1°... Rotating drum, 11
...Fixed drum, 12. Old...Electronic circuit section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
figure! ? Figure 4

Claims (1)

[Claims] A rotating magnetic head, an electronic circuit for processing signals from the rotating magnetic head, a power supply circuit for operating the electronic circuit, and a coil connected to the power supply circuit are provided on the rotating drum side, and a coil connected to the power supply circuit is provided on the fixed drum side. A magnet is arranged opposite to the coil so that an electromotive force is generated in the coil as the rotating drum rotates, and the electromotive force generated in the coil is converted into a predetermined voltage by the power supply circuit, and the A rotating head cylinder device configured to serve as an operating power source for an electronic circuit.