JPS59218603A - Video tape recorder which is small-sized and has high performance by loading electronic circuit on rotary head part - Google Patents

Abstract

PURPOSE:To make a titled video tape recorder small-sized and light weight, and to make said recorder high in performance by loading a part of an electronic circuit for constituting the video tape recorder on a rotary head part. CONSTITUTION:A part 1 of an electronic circuit which has an amplifying operation using a transistor, an FET, an IC, etc. for constituting a video tape recorder is loaded on a rotary head part, so that heads 2,3 and 4, and the electronic circuit 1 can be coupled directly. Also, a magnet or a light emitting part is provided on a stationary part for loading by including a switching circuit for switching a head at the time of reproducing, a magnetism detecting part and a light detecting part are provided on the rotary head part which rotates in the vicinity of said part, and a signal generated by detecting magnetism or light as said part rotates is used as a switching signal for switching a head, by which it becomes unnecessary to apply a switch-signal from the outside, it is possible to make the switching timing high in reliability, and by rectifying a pulse-like output of the magnetism detecting part, it can be used as a power source of the loaded electronic circuit, too.

Description

[Detailed Description of the Invention] The present invention relates to a video tape recorder that records and plays back television video signals using a magnetic tape, and works to increase the relative speed with the tape by rotating the head fully. By loading some and all of the electronic circuits that make up the entire video tape recorder on the rotating head, it is possible to achieve compactness, light weight, and high performance.

There is no example of a rotating head used in a video tape recorder of this size that is fully loaded with an electronic circuit that has a width-enhancing metal. It was connected by a rotary transformer installed around the rotating shaft of the rotating head, and only had a circuit that allowed all of the recording and playback signals to pass through.For this reason, very small signals were transmitted, and strict measures were taken to prevent all external noise from entering. In addition to requiring shielding, switching circuits for reproducing heads installed in sets of multiple sounds are installed in all fixed parts, so multiple systems of rotary transformers are required, and portable type, etc., are required to be smaller and lighter. However, the space occupied by the rotating head and the weight of the flywheel were the bottlenecks in reducing the weight of the video tape. The recorder is equipped with a part or all of the electronic circuit that makes up the videotape recorder in the rotating head, using transistors, FETs, I(, etc.) for amplification, making it possible to directly connect the head and the electronic circuit. l) S, N by completely improving the transmission efficiency between the amplifier circuit and the amplifier circuit.

In addition to improving the head switching ratio during playback, by mounting the head switching switch circuit in the metal compartment, it is possible to unify the connecting part between the rotating head part of a rotary transformer etc. and the fixed part, and to attach a magnet to the fixed part or the light emitting part in general. A magnetic sensing part and a photosensitive cheek part are provided on the rotating head part that rotates in close proximity to the shaft, and the signal generated by sensing the magnetism or the principal metal as it rotates is used as the switching signal for head switching, so that all switching signals can be transmitted from the outside. There is no need to turn on the light, making the switching timing highly reliable, and by fully rectifying the pulsed output of the magnetic sensing section, it is possible to use it as a power source for the electronic circuit mounted on it.Also, it is possible to carry the electronic circuit in the rotating head. Therefore, when connecting the fixed part and the rotating head part, it is possible to use capacitive coupling because it does not require any power to pass through.Also, by using optical coupling, it is possible to transmit multiple information in both directions, and to apply video signals. It is also possible to superimpose a head switching signal, etc., which is required for trick playback etc. in conjunction with the increase in the number of heads, as well as taking out the head.Since the electronic circuit and the head are directly connected, head switching in accordance with the increase in the number of heads is facilitated, and the output k - Since it can be systemized and taken out, it can be easily used as a recording monitor, and it can also be used to widen the frequency range, strengthen the recording signal, and reproduce weak signals with high sensitivity, and convert the video signal to PCM and improve the quality. It can be easily adapted to any situation. The loaded electronic circuit acts as a part of the flywheel, and since the entire weight of the flywheel can be reduced, the overall weight of the loaded electronic circuit can be reduced, and
The volume of the electronic circuit transferred to the rotating head can also be reduced, making it possible to achieve higher performance, smaller size, and lighter weight.

[Brief explanation of the drawing]

An example of a complete system diagram in which all recording signals are connected to a rotary transformer and playback signals are taken out from all contact pieces and can be monitored for recording is shown in f. ■, electronic circuit 2, recording head 3, playback head 4, head switching signal detection magnetic sensing section 5, contact piece 6, rotary transformer 7, rotary head drive motor

Claims (1)

[Claims] (11) The rotating head used in the video tape recorder and the part that rotates together with the rotating throat are equipped with a part of the electronic circuit (R-Fit) that makes up the video tape recorder, and the head and the amplification function are mounted. It is possible to directly connect all the electronic circuits with the same function, improve the S, N, ratio by improving the transmission efficiency, and by making all the loaded electronic circuits part of the flywheel effect, the overall size is small, lightweight, and high performance. A videotape recorder that has been designed to increase A magnetic sensing part and a photosensitive cheek part are installed in a part of the rotating head part that rotates close to this, and a signal is generated by sensing the magnetism or, in particular, the whole part as the rotating head part rotates, for switching the head. Claim +1), which is configured to be used as an operating signal for the circuit, and enables all head switching during playback to be carried out within the rotary head section without applying a switching signal from the outside, and output can be taken out as one system. A video tape recorder designed to be compact and high-performance by loading all the electronic circuits on the rotating head described above. (3) The central shaft of the rotating head and the fixed part facing it are connected by opening light to record. Compactness and high performance are achieved by fully loading electronic circuits on the rotary head section described in claim (1), which is configured to enable bidirectional coupling of various signals such as signals, playback signals, head switching signals, etc. (4) A permanent magnet is fixed to a fixed part near the rotating head part, and a generator coil is placed in a part of the rotating head part that rotates in a state where the distance and distance are completely reversed. At the same time, the electric power induced therein is used as a switching signal for switching the head of the electronic circuit loaded thereon, and is also rectified to be used as a power source for the loaded electronic circuit. A compact, high-performance fully integrated videotape recorder that is equipped with electronic circuits. (5) A contact piece is provided that contacts the center shaft of the rotating head with appropriate pressure from the fixed part, and the TV The video signal and the DC power are fully superimposed, the DC power is fully supplied to the electronic circuit mounted on the rotating head part, and the TV video signal is applied, taken out, and all the operations can be performed. A compact, high-performance video tape recorder with all electronic circuits loaded on the rotating head. (6) The fixed part that supplies all of the DC power as described in claim (5) By changing the DC voltage applied to the head, an electronic switch installed in the electronic circuit mounted on the rotating head is activated, which enables recording, playback, or head switching during trick play. Claims (Claim 11) A video tape recorder which is compact and has improved performance by fully mounting an electronic circuit on the rotating head section. (7) The electronic circuit section mounted on the dedicated head or rotating head section for recording and playback, and the open sound rotary transformer of the fixed section, and the input section and output section are all connected separately by contact, capacitance, light, etc. Depending on the situation, while recording the recording signal led from the input section to the recording head on the entire tape,
The scope of the patent claim is that it is possible to simultaneously play back all recorded tracks using a playback-only head and to monitor the entire recording while checking the recording status (compact size is achieved by fully loading electronic circuits on the rotating head described in Clause 11) , a videotape recorder with high performance.