JPH0157403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic tape recorder comprising a video tape recorder with a built-in television camera that generates video signals, and an auxiliary device connected to the video tape recorder and used to generate other video signals. The present invention relates to a recording device, and is configured to selectively switch the output video signal of the television camera and the output video signal of the auxiliary device and apply the same to the video tape recorder depending on whether or not the video tape recorder and the auxiliary device are coupled. It is composed of

Home video tape recorders generally record video signals from television broadcasts or image signals from handheld television cameras.

Conventional video tape recorders have been either stationary type with a built-in television tuner, or hand-held type that is compact and lightweight. If you want to record the image signal of the television camera with these video tape recorders, connect the video output terminal of the television camera,
After connecting the power terminal etc. to the video tape recorder and switching the video signal selector switch of the video tape recorder to the camera input side, it is extremely difficult to take pictures by holding both the television camera and the video tape recorder. It was difficult to operate.

Therefore, if an even smaller video tape recorder is realized through improvements in high-density recording technology, compact mechanisms, high-precision servo technology, etc.,
If you have a built-in television camera, you will be able to shoot video more easily.

Such a system will be briefly explained using drawings. In FIG. 1, 1 is a small video tape recorder with a built-in television camera. This device includes a television camera, a battery, a recording circuit for a video tape recorder, and its mechanism, and can immediately record video signals taken by the television camera directly to the video tape recorder on the spot. Note that in this device, the regeneration processing circuit can be omitted in order to reduce the size and weight. Reference numeral 2 denotes an auxiliary device for reproducing video signals recorded by the video tape recorder 1 and for recording television broadcast signals on the video tape recorder 1. Chiyuna,
Contains television broadcast signal recording circuits, power supply circuits, etc.

Usually, the auxiliary device 2 is installed indoors as a stationary type, and is connected to a television receiver 4 so that the video signal can be monitored. The video tape recorder 1 is then connected to an auxiliary device via a connecting cable 3. When recording a video signal on a video tape recorder, it is necessary to determine whether it is a television broadcast signal from the auxiliary device 2 or an imaging signal from the television camera built into the video tape recorder 1.
It is selected and recorded using a video signal changeover switch attached to the video tape recorder. On the other hand, when photographing with a camera outdoors, only the video tape recorder 1 is disconnected and the video signal changeover switch is switched so that the image signal from the built-in television camera can be recorded. Further, when playing back the video tape recorder 1, the video tape recorder 1 is connected to the auxiliary circuit 2 and played back.

In this way, the video tape recorder with a built-in television camera can realize an easy-to-use system that allows video recording with ease.

However, in this system, since it is easy to take video with a television camera, the video signal changeover switch must be changed frequently, which is extremely troublesome. Furthermore, in the case of outdoor shooting, since the shooting and recording state cannot be monitored on the television, it is easy to make a mistake in which the video signal changeover switch is not switched properly even if you intend to record the television camera signal.

SUMMARY OF THE INVENTION Therefore, the present invention provides a device that automatically switches video signals in order to eliminate the troublesomeness and mistakes of signal switching as described above.

To automatically switch the signal recorded on a video tape recorder, it must be determined whether the video tape recorder is currently recording a television camera signal or a television broadcast signal. Generally, when recording television broadcast signals, a video tape recorder is fixed near auxiliary equipment and used as a stationary type.
When recording television camera signals, it is used as a handy type, separated from auxiliary equipment.
Therefore, it is conceivable to identify which signal is to be recorded depending on the usage status of the video tape recorder, and to automatically switch the video signal based on this.

This method will be explained using drawings.

FIG. 2a is a diagram showing an auxiliary device 5 having a storage space for storing a television camera built-in video tape recorder 1 therein. In this way, when the video tape recorder 1 is stored in the auxiliary device 5, the television broadcast signal by the auxiliary device is recorded, and when the video tape recorder 1 is taken out from the auxiliary device, the television broadcast signal built in the video tape recorder 1 is recorded. The video signal changeover switch may be configured so that the image signal from the television camera is recorded.

An example of a video signal changeover switch having such a configuration is shown in FIG. 2b.

This is done by providing a protrusion 6 on the auxiliary device 5 side at the contact surface between the video tape recorder 1 and the auxiliary device 5, as shown in FIG. Open hole 7. When the video tape recorder 1 is stored in the storage space of the auxiliary device 5 and the contact surfaces shown in FIG. The movable contact piece 8 of the change-over switch is pushed upward so that the movable contact piece 8 contacts the positive contact point A from the reverse contact point B. The imaging signal obtained from the television camera is connected to the reverse contact B, the broadcast signal obtained from the auxiliary device 5 is connected to the positive contact A, and the video input of the video tape recorder 1 is connected to the movable contact 8. For example, the video signal input to the video tape recorder 1 can be automatically switched depending on whether or not the video tape recorder 1 is housed in an auxiliary device.

Note that when connecting the video tape recorder 1 and the auxiliary device 5, the connection cable 3 may be used, but if the connection cable 3 is connected at the same time when the video tape recorder 1 is stored in the auxiliary device 5. Even better.

The above description has been made regarding the case where the video signal switching device is configured on the video tape recorder 1 side. In such a case, since the video tape recorder 1 is frequently handled outdoors, there is a risk that the video signal switching device may be damaged. It is also better to make the video tape recorder 1 as small and lightweight as possible. For these reasons, it is considered that it is better to provide this video signal switching device on the auxiliary device 5 side if possible. Therefore, next, a case where this video signal switching device is provided on the auxiliary device 5 side will be described.

In this case, there is no need to use protrusions or through holes, and the video tape recorder 1 connects the video tape recorder 1 to the storage area of the video tape recorder 1 of the auxiliary device 5, as shown in FIG. The operating valve of the video signal switching micro switch 9 attached to the camera may be directly operated. This is because even if the operating valve of the microswitch 9 is exposed inside the auxiliary device, it will not be touched directly and there is no risk of malfunction.

The video signal can be switched using the positive and negative contacts of the micro switch 6, but in this case, the signal obtained by the television camera built into the video tape recorder 1 is transferred to the auxiliary device 5. The video signal selected by the video signal switching device must be sent back to the video tape recorder 1, making the transmission and reception of video signals between the video tape recorder 1 and the auxiliary device 5 extremely complicated. Become. Therefore, instead of directly switching the video signal using the micro switch 9, the micro switch 9 generates a control signal for switching the video signal, and this control signal causes the electronic switch to switch the video signal. One possible method is to do it electronically. An example of this method will be explained.

In FIG. 4, T ₁ and T ₂ are video signal switching transistors, and only one of them is always on. Transistor T ₂ with resistors R ₃ and R ₄
The bias voltage of the transistor T 1 is set to be sufficiently higher than the bias voltage of the transistor T ₁ caused by the resistors R ₁ and R ₂ . By doing this, when the micro switch 9 is off, no bias voltage is applied to the transistor _T2 , and only the transistor _T1 is turned on, so that the signal from the television camera applied to the base of the transistor _T1 is not applied. The video signal is output to the video signal switching output terminal 10 and input to the video tape recorder. On the other hand, when the micro switch 9 is turned on, the transistor T ₂ is turned on, the transistor T ₁ is turned off, and the signal from the television broadcast applied to the base of the transistor T ₂ is outputted to the video signal switching output terminal 10. be done. By using the transistor switch as described above, it is possible to easily construct a device that automatically switches between a television camera signal and a television broadcast signal.

Note that although the above explanation deals only with switching of video signals, the same can be applied to switching of audio signals.

As described above, according to the present invention, an imaging signal obtained by a television camera built into a video tape recorder and a television signal obtained by an auxiliary device can be automatically combined using a simple configuration. It can be switched, has excellent operability,
Moreover, a device free from operational errors can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a system consisting of a video tape recorder with a built-in television camera and an auxiliary device, and FIG. FIG. 2b is a side sectional view of the same main part, FIG. 3 is a side sectional view showing the main part of another embodiment of the present invention, and FIG.
The figure shows the internal circuit diagram. 1... Video tape recorder with built-in television camera, 5... Auxiliary equipment, 8, 9... Switch.

Claims (1)

[Claims] 1 A magnetic recording and reproducing device incorporating a television camera that generates a first video signal, an auxiliary device having a storage space for accommodating the magnetic recording and reproducing device and having means for generating a second video signal, and a switch. switch means for selectively switching and applying the first video signal and the second video signal to the magnetic recording and reproducing device, the switch means applying the first video signal and the second video signal to the storage space of the magnetic recording and reproducing device; A magnetic recording device characterized in that it is configured to be driven in conjunction with the storage operation of the magnetic recording device.