JPS62192061A - Video reproducing device - Google Patents

Abstract

PURPOSE:To simplify an operation by making a device into an operatable condition at the time of loading a video cassette and making the device into a standby condition at the time of unloading the video cassette. CONSTITUTION:When a video cassette is loaded into a device, the pulse from a single multi M.M 13 is outputted to a system control circuit 3. The control circuit 3, to which the pulse is inputted, makes a power source on and off circuit 10 into the power source on condition (operatable condition). Next, when the device is in the reproducing scanning condition and the input is executed from the external part to a cassette key 1, the control circuit 3 outputs a signal to a cassette unloading device 12 and unloaded the video cassette from the device. The pulse from the single multi M.M 14 is outputted to the control circuit 3. When the pulse is inputted to the control circuit 3, the control circuit 3 makes the power source on and off circuit 10 into the power source off condition (standby condition).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video playback device that can play back video signals with simple operation.

BACKGROUND ART FIG. 3 shows a configuration diagram of a conventional video playback device (hereinafter abbreviated as the device). In the figure, 1 is a cassette ejection key for inputting a cassette ejection instruction from the outside, and 2 is a cassette ejection key for inputting a cassette ejection instruction from the outside. A key interface circuit that transmits operation instruction information to the system control circuit 3, a system control circuit 3 that controls the operating state of the device, a switch SWl that detects the operation of the cassette, and a switch 4 that detects based on information from SWl. A cassette motion detector that outputs a signal, 8 a playback instruction signal generator that outputs a playback instruction signal to the system control circuit 3 when there is an input signal, and 9 a cassette attachment for attaching the bidet to the device. unit, 10 indicates the device is ready for operation (
11. Power on/off circuit for putting into standby state (hereinafter abbreviated as power-on state) or standby state (hereinafter abbreviated as power-off state)
1 is a mechanism control circuit; 12 is a cassette ejector for ejecting a video cassette from the apparatus; 21 is a power key for inputting power-on or power-off information from the outside.

In the conventional video playback device having the simple operation function configured as described above, when power-on information is input from the outside to the power key 21, a power-on instruction signal is output from the key interface circuit 2 to the system control circuit 3. Then, the system control circuit 3 turns on the power on/off circuit 1o. Next, when the video cassette is inserted into the apparatus, the cassette motion detector 4 detects the insertion of the cassette and outputs a detection signal to the system control circuit 3 and the reproduction instruction signal generator 8. The system control circuit 3
A mounting instruction signal is output to the cassette mounting device 9 at the rising edge Pll of signal 1 in the figure. When a mounting instruction signal is input to the cassette mounting device 9, the video cassette is mounted at a predetermined position in the apparatus. Subsequently, at the falling edge P12 of signal 1 in FIG. The signal is output and the device enters the regeneration running state.

Next, when an external input is made to the cassette ejection key 1, the system control circuit 3 temporarily stops the device, and then
An ejection instruction signal is output from the stem control circuit 3 to the cassette ejector 12, and the video cassette is ejected from the apparatus. When power-off information is input to the power key 21 from the outside, the key interface circuit 2 outputs the power-off information to the system control circuit 3, and the device is turned off.

Problems to be Solved by the Invention However, with the above configuration, it is necessary to turn on the power to the device by external input before inserting the video cassette, and furthermore, even after the video cassette is ejected, There is a problem in that the device must be turned off by input from the outside.

In view of this, an object of the present invention is to provide a video playback device that can operate a simple operation function without turning the power on or off by inputting from the outside.

Means for Solving the Problems The present invention enables the device to become operational when a video cassette is inserted, puts the device into standby mode when the video cassette is ejected from the device, and puts the device into standby mode when the video cassette is ejected from the device. power switch means for enabling the device to operate and executing a cassette ejecting means when the device changes from a non-energized state to a standby state while the device is attached to the device; and for returning to the standby state after executing the cassette ejecting means. It is a video playback device.

Effect of the Invention With the above-described configuration, the present invention enables the device to operate when a video cassette is inserted into the device. Further, when the video cassette is ejected from the apparatus, the apparatus is put into a standby state. When the device changes from the energized state to the standby state with a video cassette inserted in the device, the device is put into an operable state, the cassette is ejected from the device, and then the standby state is restored again.

Embodiment FIG. 1 shows a configuration diagram of a video reproducing apparatus in an embodiment of the present invention. In the figure, 1-4.8.9-1
2, SW1 are the same components as in FIG. 3, and are given the same numbers.

SW2 is a switch for detecting the loading/unloading state of a video cassette; 5 is a cassette loading/unloading detector;
Based on the information from SW2, a detection signal is output at the timing shown in 2 in FIG. Reference numeral 6 denotes a power supply voltage detector for the system control circuit, which outputs a high level when the power supply voltage is supplied to the system control circuit. 7 is a system H7l that outputs a discharge instruction signal when there is an input signal.
l Discharge instruction signal generator output to m circuit 3, 13-1
5 is a monostable multivibrator with a reset input (
16 is an OR circuit, 17 is a NOT circuit, and 18 is a power-on/off detector that outputs a low level when the device is on, and an H when it is off. be. Reference numerals 19 and 20 denote delay circuits (hereinafter abbreviated as L).The operation of the video reproducing apparatus of this embodiment configured as described above will be explained below with reference to FIG.

When a video cassette is inserted into the apparatus, a pulse is output from M and M13 to the system control circuit 3 at the rising edge Pl of signal 1 in FIG. The system control circuit 3 to which the pulse has been input turns the power on/off circuit 10 into a power on state. The detection signal output from the cassette operation detector 4 is input to the system control circuit 3 through the DL1 9. The system control circuit 3 outputs a signal to the cassette loading device 9 at the rising edge P7 of the signal 3 in FIG. 2, and the video cassette is loaded into the device. When the reproduction instruction signal generator 8 outputs the reproduction instruction signal to the system control circuit 3 at the falling edge P8 of the signal 3 in FIG. 2, the apparatus enters the reproduction running state. Next, when the apparatus is in a playback running state, when an input is made to the cassette ejection key 1 from the outside, the seven-stem control circuit 3 outputs a signal to the cassette ejector 12 to eject the video cassette from the apparatus. Then, M and M14 output a pulse to the system control circuit 3 at the falling edge P4 of signal 1 in FIG.

/When a pulse is input to the stem control circuit 3, the stem r
The l;u control circuit 3 turns the power on/off circuit 10 into a power off state.

When the power supply voltage is supplied to the system control circuit 3 with the video cassette attached to the apparatus, the output of the power supply voltage detector 6 of the system control circuit rises from L to H. M, M2
S outputs a pulse to the system control circuit 3 at the rise of this signal. The system control circuit 3 to which the pulse is input,
The power on/off circuit 1o is turned on. On the other hand, M
, M15 passes through DL21 and is also input to the discharge instruction signal generator after the power supply circuit is turned on. When the pulse is input to the discharge instruction signal generator, the discharge instruction signal is input to the system control circuit 3;
The system control circuit 3 to which the ejection instruction signal has been input outputs a signal to the cassette ejector 12 to eject the video cassette from the apparatus. When the video cassette is ejected from the apparatus, a pulse is output from M and M14 to the system control circuit 3 at the falling edge P4 of signal 1 in FIG. When a pulse is input to the system control circuit 3, the system control circuit 3
is a power-on/off circuit 1o'f: power-off state.

As described above, according to this embodiment, M and M, which output pulses based on the video cassette motion detection signal, are used as OR gate gate signal generators in the front stage of the system control circuit, and the signals from the power supply voltage detection circuit of the system control circuit are A reproduction instruction signal generator that outputs a reproduction instruction signal in response to an input from a cassette operation detector, by using M, which outputs a pulse based on a detection signal, and M as a gate signal generator of the OR gate and an input signal generator of an ejection instruction signal generator. By providing the device as an instruction signal generator to the system control circuit, when a video cassette is inserted in the standby state, the device is enabled to operate, and when the video cassette is ejected from the device, the device is placed in the standby state, Further, even if a video cassette is installed in the device in the de-energized state, when the device enters the standby state, the device is enabled to operate, the video cassette is ejected from the device, the device returns to the standby state, and the automatic playback means can be executed. Then, it is possible to realize an automatic playback means that puts the device into a playback running state when a video cassette is installed in the device.

As described in detail, according to the present invention, the automatic playback function can be realized without turning the power on or off by external key input, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a video playback device according to embodiment 1 of the present invention, FIG. 2 is a timing diagram of the same embodiment, FIG. 3 is a configuration diagram of a conventional video playback device, and FIG. 4 is a timing diagram of a conventional example. It is a diagram. 1...Cassette ejection key, 3...System control circuit, 4...Cassette movement detector, 5...
...Cassette loading/ejection detector, 6...System! fi control circuit power supply voltage detector, 7...discharge instruction signal generator, 8...regeneration instruction signal generator,
11...Mechanism control circuit, 13-1
5... Monostable multivibrator. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
figure

Claims (2)

[Claims] (1) a cassette mounting means for mounting a video cassette at a set position; an automatic playback means for forcing the device into a playback state when the cassette mounting is completed; and a cassette ejecting means for ejecting the cassette from the set position; When a cassette is inserted in the standby state, the device is released from the standby state and becomes operational, the cassette loading means is executed, and when the operation of the cassette ejecting means is completed, power to all circuits of the device is removed. and a power switch means for setting the video playback device to a standby state. (2) The power switch circuit enables the device to operate if a video cassette is attached when the device changes from a non-energized state to a standby state, and causes the device to execute the cassette ejecting means, and after executing the device, 2. The video playback device according to claim 1, further comprising a function of returning to a standby state.