JPH0112455Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a portable magnetic recording/reproducing device.
By controlling the power supply voltage supply of the RF converter depending on whether or not the output terminal of the converter is connected to the connector, it is possible to save power consumption of portable power sources such as rechargeable batteries, and also to reduce the power consumption of portable power sources such as rechargeable batteries. It is an object of the present invention to provide a portable magnetic recording and reproducing device that can reduce noise generated by a digital receiver and further improve operability.

Portable magnetic recording/reproducing device (so-called portable
Similar to stationary magnetic recording and playback devices, the recording and playback times of VTRs (VTRs) have become longer, and magnetic tapes that can record and playback for 4 or 6 hours have appeared instead of the conventional 2-hour recording and playback time. are doing. Such portable magnetic recording/reproducing devices are often used in combination with television cameras for outdoor filming, etc., and due to their original purpose of use, they are smaller and lighter than stationary magnetic recording/reproducing devices. This is required. Particularly in recent years, there has been an increasing demand for smaller and lighter video cameras, such as 8 mm video. On the other hand, portable power sources such as rechargeable batteries for portable magnetic recording and reproducing devices generally tend to become larger and heavier as the usable time increases. We had no choice but to use a power source that could be used for about an hour. For this reason, the portable magnetic recording and reproducing device described above, which is capable of recording and reproducing over long periods of time, must be equipped with several portable power supplies.
It was inconvenient.

In addition, some portable magnetic recording and reproducing devices have a built-in RF converter that converts the reproduced video signal into the high-frequency television signal band of an empty channel and supplies it to the antenna terminal of the monitor television receiver. However, the power consumption of the RF converter is approximately less than 10% of the total power consumption. Conventional portable magnetic recording and reproducing apparatuses are configured so that power is not turned on to the circuit system when the magnetic tape is not running, in order to avoid wasteful power consumption at times other than during operation. However, if the RF converter is turned off and connected to a monitor television receiver with no signal, the audio noise will increase dramatically, so even if the main unit is not operating, the RF
Power was only being applied to the converter. For this reason, in conventional portable magnetic recording and reproducing devices, the RF converter alone has a limited capacity, not only when the RF converter is not used during recording, but also when the magnetic tape is not running or when the entire circuit system is not operating. It has the disadvantage that it consumes a certain amount of power from the portable power source.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a block system diagram of an embodiment of the present invention. In the figure, 1 is a portable magnetic recording and reproducing device;
The power supply voltage from the power supply circuit 2 is applied to the recording/reproducing circuit 3 and
The signals are supplied to the RF converter 4, respectively. A normally open switch 6 is provided at the output terminal 5 of the RF converter 4, and only when a connector (F connector, etc.) 7 is connected to the output terminal 5, the switch 6 is closed and the connector is connected to the output terminal 5. When 7 is not connected, it is opened. This switch 6 is connected to a switch control circuit (not shown) in the power supply circuit 2, and when the switch 6 is open, the output power voltage of the power supply circuit 2 is not supplied to the RF converter 4, and the recording/reproducing circuit 2 The switch control circuit is controlled so that the power supply voltage is supplied to both the RF converter 4 and the recording/reproducing circuit 3 when the switch is closed.

Cable 8 with connector 7 connected to one end
The connector 9 at the other end is connected to a television receiver 10.
It is connected to the antenna terminal 11 of. This results in
When using the portable magnetic recording and reproducing device without connecting the connector 7 to the output terminal 5 of the RF converter 4 (for example, when shooting outdoors), the power supply voltage is not supplied to the RF converter 4, so the RF converter 4 that is not in use can save on electricity consumption. On the other hand, when the recorded video signal is to be monitored and played back on the television receiver 10, the connector 7 is connected to the output terminal 5, and the connector 9 is connected to the output terminal 5.
is connected to the antenna terminal 11, power supply voltage is supplied to the RF converter 4, which prevents the generation of audio noise from the television receiver 10 when there is no signal. When the signal is extracted, it is converted to RF
After being converted into a television high frequency signal band of a predetermined empty channel by the converter 4, it can be supplied to the antenna terminal 11 of the television receiver 10 for monitor reproduction.

Next, to explain one embodiment of the present invention in more detail, Fig. 2 is a signal connection diagram of an embodiment of the portable magnetic recording/reproducing device of the present invention, and Fig. 3 is an embodiment of the device of the present invention. An example power supply voltage wiring diagram is shown. In Fig. 2, the same components as in Fig. 1 are given the same reference numerals.
The explanation will be omitted. In FIG. 2, the portable magnetic recording and reproducing device is provided with a connector board 12, a brightness and color signal board 13, an audio and servo board 14, a recording and reproducing circuit board 15, a head circuit board 16, an RF converter 4, etc. Ori,
Required circuits (not shown) are mounted on each of the boards 12 to 16. received by antenna 17,
The television signal of the desired channel that has been selectively tuned and demodulated by the tuner 18 or the television signal of the desired subject that has been imaged by the television camera 19 and processed and extracted by the camera control unit 20 is sent to the connector board 12.
Input to upper connector 21, video output terminal 2
A video signal is output from 7 and 28, and an audio signal is output from an audio output terminal 29. The television camera 22 is a television camera that outputs a video signal and an audio signal from dedicated terminals, respectively, and the video signal is sent to the video output terminal 27 through the video input terminal 23 and the switch S ₁ connected to the terminal L side. The audio signal is output to the audio output terminal 29 via the audio input terminal 24 and the switch _S2 connected to the terminal L side. Further, the audio signal from the microphone 25 is outputted to the audio output terminal 29 via the microphone input terminal 26. Switch _S3 is connected to the REC side of the terminal during recording, and connected to the PB side during playback.

During recording, the output video signal from the video output terminal 27 is supplied to the video input terminal 30 of the brightness and color signal board 13, the brightness signal is frequency modulated and output from the terminal 31, and the carrier color signal is frequency modulated to the low frequency range. It is converted and output from the terminal 32. Output terminal 3
1 and 32 are input terminals 3 of the recording/reproducing circuit board 15
3 and 34, and recording color video signals are output to output terminals 35 and 36. This recording color video signal is transmitted to input terminals 37 and 3 of the head circuit board.
8 and output terminals 39 and 40, respectively, to rotary video heads 41 and 42, and are alternately recorded one field at a time. The audio signal output from the audio output terminal 29 is recorded by the audio head 45 through the input terminal 43 and output terminal 44 of the audio/servo board 14, respectively. The microphone audio signal is also supplied to an audio head 45 via an output terminal 46, an input terminal 47, and an output terminal 44, thereby being recorded on the magnetic tape.

During reproduction, the color video signals alternately reproduced by the rotating video heads 41 and 42 are sent to the input terminals 48 and 49 of the head circuit board 16, the output terminals 50, and
51, input terminals 52, 5 of recording/reproducing circuit board 15
A frequency modulated luminance signal is taken out from an output terminal 54 through the output terminal 55, and a low-frequency conversion carrier color signal is taken out from an output terminal 55, and then supplied to input terminals 56 and 57, respectively. These signals are converted into the original standard color video signals by a circuit (not shown) on the luminance and color signal board 13, and then sent from the output terminals 58, 59 to the video input terminals 60, 61 of the connector board 12. The video signal is then output from the video output terminals 28 and 62. On the other hand, the audio signal reproduced by the audio head 45 is transmitted to the audio input terminal 64 and the audio output terminal 6 of the audio and servo board 14.
5. The sound is output from the sound output terminals 67, 68 and 72 through the sound input terminal 66 of the connector board 12, respectively.

The output playback video signal of the video output terminal 28 and the output playback audio signal of the audio output terminal 68 are output to the video input terminal 63 and the audio input terminal 69 of the RF converter 4, respectively.
The signal is supplied to the RF converter 4 via the RF converter 4, where it is multiplexed and converted into a television signal band of a predetermined empty channel, and then outputted to the output terminal 5 via the input terminal 71 of the connector board 12. The video output terminal 62 is connected to a video input terminal 73 of the television receiver 10, and the audio output terminal 67 is connected to an audio input terminal 74. Furthermore, the audio output terminal 72 is connected to an earphone 75. In this way, the reproduced video signal and the reproduced audio signal are each monitored and reproduced by the television receiver 10, and the reproduced audio signal can be listened to through the earphone 75. Note that the circuit shown in the second diagram can monitor and reproduce the video signal for recording even during recording.

Here, as mentioned above, when the output terminal 5 to which the output signal of the RF converter 4 is output is connected to the antenna terminal 11 of the television receiver 10, the switch 6 is closed, and the circuit shown in FIG. A control signal C is supplied to a switch control circuit 76 inside.

In Figure 3, a DC power supply voltage (for example, 12V) from a portable power supply (not shown) is applied to the connector board 1.
The power switch S 4 and the unloading switch S ₅ are connected to the power supply switch S 4 and the unloading switch S _{5 through the power supply input terminal 77 of the PCB 2, the power supply output terminal 78 of the PCB 2, and the input terminal 80 of the operation board 79} , respectively.
These switches S ₄ and S ₅ are connected to
DC power supply voltage is supplied to the cassette switch _S6 only when one of the terminals shown in black is closed. Since the cassette switch _S6 is configured to be connected to the terminal indicated by the white circle when a cassette tape is installed, it will not enter any mode unless a cassette tape is installed.
DC power supply voltage is supplied to each circuit system only after the cassette tape is loaded.

The DC power supply voltage from the cassette switch _S6 is applied to the power input terminal 83 of the power transistor board 82 via the output terminal 81. Collector 8 of a power transistor (not shown) on its substrate 82
4C, emitter 84E, and base 82B are connected to terminals 86, 87, and 88 of the capstan servo and stabilized power supply circuit board 85, respectively.
The DC power supply voltage from 7 is supplied to a stabilized power supply circuit 89 . The stabilized power supply circuit 89 generates a constant voltage of, for example, 9V, and outputs it to the output terminal 91 as well as to the switch control circuit 76 described above. The switch control circuit 76 outputs the constant voltage of 9V to the output terminal 92 and the input terminal 9 of the jump board 93 only when the control signal C is supplied by closing the switch 6.
4. Output to the power input terminal 98 of the RF converter 4 via the output terminal 95, the input terminal 96 of the connector board 12, and the output terminal 97, respectively.

On the other hand, the switch control circuit 76 receives the control signal C
is not supplied, that is, when the connector is not connected to the output terminal 5, the output constant voltage of the stabilized power supply circuit 89 is not output to the output terminal 92, so the power supply input terminal of the RF converter 4 98 is not supplied with a DC power supply voltage. This prevents wasteful power consumption.

Note that the circuits in FIG. 3 other than those described above have no direct relation to the gist of the present invention, and therefore will only be briefly explained. Reference numeral 100 denotes a mechanical control board that supplies power supply voltage to an end sensor 101, a start sensor 102, and a tape guard 103, respectively, and also supplies a drive current to a stop solenoid and a pause solenoid (none of which are shown) as required. An end sensor 101 is a sensor for setting the tape to a stop mode when the tape end leader is reached in playback, recording, or fast forward mode. The start sensor 102 is a sensor for setting the stop mode when the tape beginning leader section is reached during the rewind mode. The tape guard 103 is a circuit that puts the phototransistor on the tape guard board into a stop mode when it is pressed with tape. Further, 104 is a power transistor substrate, 10
5 is a light emitting diode board, and 106 is a reference signal generation circuit board.

Note that the present invention is not limited to the above-described embodiment, and the supply of power supply voltage to the RF converter 4 may be directly controlled, for example, in response to opening and closing of the switch 6.

As mentioned above, the portable magnetic recording and reproducing device according to the present invention opens and closes a switch depending on whether or not there is a connection to the output terminal of the connector for connecting the output terminal of the RF converter and the monitor television receiver. The power supply voltage is supplied or stopped to the RF converter according to the opening and closing of this switch, and the power supply voltage is supplied to the RF converter only when the connector is connected to the output terminal of the RF converter. When the connector is not connected to the output terminal of the RF converter, the power supply voltage is not supplied to the unused RF converter, saving unnecessary power consumption and thus extending the usable time of the portable power supply. This makes it possible to reduce the number of portable power supplies required for a portable magnetic recording and reproducing device capable of long-time recording and playback compared to conventional methods, and the connector can be connected to the output terminal of the RF converter. When the power supply voltage is supplied to the RF converter,
Not only can the output signal of the RF converter be monitored and reproduced on a television receiver, but it can also prevent the generation of audio noise on the television receiver even when there is no signal.
The power supply voltage supply to the converter is automatically supplied or stopped depending on whether or not there is a connection between the connector and the output terminal of the RF converter, so it has features such as improved operability.

[Brief explanation of the drawing]

Fig. 1 is a block system diagram showing an embodiment of the device of the present invention, Fig. 2 is a signal wiring diagram showing an embodiment of the device of the invention, and Fig. 3 is a power supply voltage connection diagram showing an embodiment of the device of the invention. It is a diagram. 1... Portable magnetic recording/reproducing device, 2... Power supply circuit, 4... RF converter, 5... Output terminal, 6
... Switch, 7, 9 ... Connector, 10 ... Television receiver, 11 ... Antenna terminal, 12
... Connector board, 13 ... Brightness and color signal board, 14 ... Audio and servo board, 15
...Recording/reproducing circuit board, 16...Head circuit board, 76...Switch control circuit, 85...Capstan servo and stabilizing power supply circuit board, 89...
Stabilized power supply circuit, 98...RF converter power supply voltage input terminal.

Claims (1)

[Scope of utility model registration request] In a portable magnetic recording/reproducing device having an RF converter, a switch is opened or closed depending on whether or not a connector for connecting an output terminal of the RF converter and a monitor television receiver is connected to the output terminal. The above depending on whether the switch is opened or closed.
A portable magnetic recording/reproducing device configured to supply or stop supplying a power supply voltage to an RF converter, and to supply the power supply voltage to the RF converter only when the connector is connected to an output terminal of the RF converter.