JPH0550061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a novel videotape recorder,
In particular, it is necessary to provide a special operation switch to realize a state in which the tape is played while being fed or rewound at a speed considerably faster than the running speed during normal playback, that is, a search state in which image information is played back. Therefore, it is an object of the present invention to provide a new video tape recorder which is easy to miniaturize, and which is easy to return from the search state to the normal playback state.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally, in a video tape recorder, when fast forwarding or rewinding, the tape is played back at a speed of 40 to
The vehicle runs at such a high speed that the image cannot be seen even when played back at around 100x. Therefore, there are of course types in which only playback is performed with the tape wound around the video head rotating drum, and fast forwarding and rewinding are performed without the tape being wound around the video head rotating drum. Even in the case of a type in which rewinding is performed with the video head wound around a rotating drum, it is impossible to perform fast forwarding or rewinding while the image is being played back on the monitor screen. Therefore, the device is run at a speed that is intermediate between the speed at which it is fast forwarded or rewinded and the standard speed (hereinafter referred to as the "search speed" for convenience), for example, 5 to 20 times the standard speed, and played back in that state. A device has been developed that allows this to be done. According to such a tape recorder, when cuing up a tape, the tape is run at high speed by fast forwarding or rewinding until the area near the desired cue reaches the video head, and the tape is run at high speed by fast forwarding or rewinding until the area near the desired cue reaches the video head. When it is thought that the tape head has been reached, the tape forwarding or returning speed can be reduced to the search speed to allow playback. Therefore, by observing the reproduced image on the monitor screen while running the tape at the search speed, which is slower than the fast-forwarding and rewinding speeds but considerably faster than the standard speed, the desired image was reproduced. At this point, you can cue up as if you were playing normally. Therefore, it is possible to reduce the number of times in which the tape is repeatedly moved too far when fast-forwarding and then too far back when rewinding, and the cue can be found quickly. In particular, with a type of video tape recorder that performs not only playback but also fast-forwarding and rewinding while the tape is wound around the rotating video head drum, the time required to transition from the fast-forwarding or rewinding state to the search state is extremely short. Therefore, cueing can be done very quickly. Therefore, in addition to playback, the applicant company has a video head of the type that performs fast forwarding and rewinding with the video head wound around the rotating drum. A video tape recorder has been developed which is provided with a backward playback switch and can be brought into the above-mentioned search state by operating the fast forward playback switch or the rewind playback switch.

By the way, in this video tape recorder, if you press the fast-forward playback switch or the rewind playback switch while in the fast-forward or rewind mode, it will be in the search mode only while you are pushing it, that is, while forwarding or rewinding at the search speed. The device was set to playback mode, and as soon as the switch was released, the playback mode resumed normal playback. Therefore, when switching from fast forward or rewind to search mode, if the played part is quite far from the part you are trying to cue, release your finger from the fast forward playback switch or rewind playback switch and try again. The tape must be run again at high speed by operating a fast forward switch or a rewind switch, which is extremely troublesome. Further, by providing a fast forward playback switch and a rewind playback switch in addition to a playback switch, fast forward switch, and rewind switch, miniaturization of the device is severely restricted, and therefore, especially in a portable video tape recorder, it is extremely difficult to miniaturize the device. This cannot be ignored as a constraint on miniaturization in products that require miniaturization.

OBJECTS OF THE INVENTION Accordingly, the present invention provides a special method for realizing a state in which image information is played back while feeding or rewinding the tape at a speed considerably faster than the running speed during normal playback, that is, a search state. It is an object of the present invention to provide a new video tape recorder that does not require an operation switch, is easy to downsize, and is easy to return from a search state to a normal playback state.

Structure of the Invention The structure of the present invention to achieve the above object is to provide a video tape recorder that performs not only playback but also fast forwarding and rewinding while a tape storing information such as images is wound around a rotating video head drum. and a playback switch for feeding the tape so that it can be played, a fast forward switch for feeding the tape at high speed, and a rewind switch for rewinding the tape at high speed as an operation switch for running the tape,
When the fast forward switch or the rewind switch is pressed while in the fast forward or rewind state, the tape runs at an intermediate speed between the running speed during fast forwarding or rewinding and the running speed during playback while the switch is pressed. In addition, when a search state is entered in which image information is played back, and in this search state, if the playback switch is further operated and at the same time the fast forward switch or the rewind switch is released from the pressed state, the normal playback state is returned to. The device is characterized in that it also includes a control circuit.

Embodiments Hereinafter, the video tape recorder of the present invention will be described in detail according to embodiments shown in the accompanying drawings.

The drawings are for explaining an example of the implementation of the video tape recorder of the present invention, and FIG. 1 shows its external shape. 1 is a power switch, and 2 is a cassette eject button, which is pressed to eject a tape cassette mounted in a cassette holder 3 on the top surface of the video tape recorder. Reference numeral 4 denotes a liquid crystal display section for displaying the time, the current mode of the video tape recorder, etc.

5 is an operation button arrangement section in which various operation buttons 6 to 13 for putting the video tape recorder into various states are arranged; 6 is a play button; 7 is a fast forward button; 8 is a rewind button;
9 is a stop button, 10 is a double speed playback button, 11 is a recording button, 12 is an after-recording button, and 13 is a pause button.

FIG. 2 shows a tape running mechanism of a video tape recorder. 14 is a supply reel, 15 is a tension stabilizer, 16 is a full width erasing head, 17 is a video head rotating drum provided with a video head 18, 19 is an audio erasing head, 20
21 is a voice control head, 21 is a capstan, 22 is a pinch roller, 23 is a take-up reel, and the tape 24 passes through each of the above sections in the above order. This video tape recorder is of the β (trade name) type, in which the tape 24 is pulled out from the cassette, and the video head rotating drum 17 is inserted into the video tape recorder.
The loading of the tape 24 is carried out by rotating the loading ring 26 on which a pin 25 for pulling out the tape is formed.
This is done by pulling out the material and winding it around the rotating drum 17 one after another. A major feature is that in addition to playback, fast forwarding and rewinding are also performed with the tape 24 wound around the drum 17.

Figure 3 shows normal playback on a video tape recorder.
It shows state transitions between fast-forward playback, rewind playback, fast-forward playback, and rewind playback states.

Pressing playback button 6 performs normal playback, and pressing fast forward button 7 causes fast forwarding, that is, tape forwarding at a speed approximately 40 to 100 times the tape running speed (standard speed) during normal playback. When the rewind button 8 is pressed, rewinding, that is, rewinding the tape at the same speed as in fast forwarding is performed. In such fast-forwarding and rewinding states, the running speed of the tape is so fast that no visible image appears even when the image is reproduced. Therefore, no reproduction is performed during fast forwarding or rewinding, and no reproduced image appears on the monitor screen (not shown).

By the way, when the fast-forward button 7 is pushed, the fast-forward mode is entered as described above, but when the fast-forward button 7 is pushed again in that state, the fast-forward mode changes to a state where fast-forward playback is performed, as shown by arrow a in FIG. . The fast-forward playback state continues while the push is being performed. In this fast-forward playback state, the tape 24 is played back while running at a speed of about 5 to 20 times the standard speed, and the playback image that appears on the monitor screen changes very quickly but is sufficiently visible. . If you release your finger from the fast-forward button 7 during this fast-forward reproduction state, the state returns to the fast-forward state as shown by arrow b. Also, if you press the playback button 6 with another finger while keeping the fast-forward button 7 pressed in order to maintain the fast-forward playback state, then if you release your finger from the fast-forward button 7, the screen will move as shown by arrow c. The fast-forward playback state changes to the normal playback state.

Similarly, when the rewind button 8 is pressed again while in the rewind state, the rewind play state changes as shown by arrow d, and the rewind play state continues while the button is pressed. When the player releases the rewind button 8 while in the rewind playback state, the rewind state returns as shown by arrow e. If the playback button 6 is pressed while in the rewind playback state, when the rewind button 8 is released, the rewind playback state returns to the normal playback state as shown by arrow f.

If the fast-forward button 7 is pressed during normal playback, the state changes to a fast-forward playback state as shown by arrow g, and the fast-forward playback state continues while the button is pressed. After that, when you release your finger from the fast forward button 7, the normal playback state returns as shown by arrow h. Similarly, if the rewind button 8 is pressed during normal playback, the rewind playback state changes as shown by arrow i, and the rewind playback state continues while the button is pressed. After that, when you release your finger from the rewind button 8, the normal playback state returns as shown by arrow j.

When fast forwarding or rewinding during normal playback, it is necessary to press the stop button 9 and then the fast forward button 7 or the rewind button 8. Incidentally, if the playback is to be performed at twice the standard speed, the double speed playback button 10 may be pressed.

As described above, control for changing the state is performed by the built-in computer.

In this manner, the video tape recorder of the present invention is configured so that when the fast forward button 7 or the rewind button 8 is pressed while in the fast forward or rewind state, the fast forward playback state or the rewind playback state is entered as long as the button is pressed. It is characterized by the fact that FIG. 4 shows a control circuit which can receive a signal from a computer indicating a fast forward or rewind state and use that signal to cause transitions between states as described above.

In the figure, T1 is a fast-forward signal input terminal that accepts a fast-forward signal sent from the computer when in a fast-forward state, and T2 is a rewind signal input terminal that receives a rewind signal sent from the computer when in a rewind state. AND1 is an AND circuit that receives a fast-forward signal from the fast-forward signal input terminal and a signal from the fast-forward button 7, and when a signal of "1" is output from this, the fast-forward playback state is entered.
AND2 is an AND circuit which receives the rewind signal from the rewind signal input terminal T2 and the signal from the rewind button 8, and when a signal of "1" is output from this, the rewind playback state is entered. These two AND circuits
The output signals of AND1 and AND2 are applied to an OR circuit OR1. The output signal of the OR circuit OR1 is applied to the data input terminal D of the D-type flip-flop DFL and to the NOT circuit NOT1. The circuit NOT
The output signal of 1 and the output signal of flip-flop FL are applied to an AND circuit AND3. When a signal of "1" is output from the AND circuit AND3, a normal reproduction state is entered. AND4 is a fast forward signal from the fast forward signal input terminal T1, a signal obtained by inverting the output signal of the AND circuit AND1 by the NOT circuit NOT2, and the AND circuit AND3.
This is an AND circuit that receives a signal obtained by inverting the output signal of . When a signal of "1" is output from this AND circuit AND4, a fast forward state is entered. AND5 connects the rewind signal from the rewind signal input terminal T2 and the output signal of the AND circuit AND2 to the NOT circuit NOT4.
The signal inverted by
This is an AND circuit that receives the output signal of NOT3, and the output signal of this AND circuit AND5 is "1".
In this case, it will be in the rewind state. OR2 is an AND circuit
An OR circuit that receives the output signals of AND4 and 5.
The output signal of the OR circuit OR2 is input to the reset terminal R of the D-type flip-flop DFL. or,
The signal from play button 6 is a D-type flip-flop.
Input to DFL's clock input terminal CK.

The operation of this circuit will be explained below. First, when the fast-forwarding state is in progress but the fast-forwarding button 7 is not currently pressed, the process is as follows. A fast forward signal is input to the input terminal T1. and circuit
For AND1, the signal from input terminal T1 is "1", but the signal from fast forward button 7 is "0", so
Outputs "0". The output signal of the OR circuit OR1 is also "0", and the output signal of the NOT circuit NOT1 which inverts it becomes "1".
Since the output signal of the type flip-flop DFL is "0", the output signal of the AND circuit AND3 is also "0".
, and the NOT circuit NOT3 inverts this signal.
The output signal of is "1". Also, AND circuit
NOT2 circuit that inverts the output signal of AND1
The output signal of is also "1". Therefore, all three signals input to the AND circuit AND4 become "1", and the output signal thereof also becomes "1", so that the fast-forward state is maintained.

Next, if you press the fast forward button 7 while in the fast forward state, the AND circuit will continue to operate as long as you press the fast forward button 7.
The output signal of AND1 becomes "1" and at the same time, the output signal of NOT circuit NOT2 becomes "0", so the output signal of AND circuit AND4 becomes "1".
The value changes from 0 to 0. Therefore, the fast-forward state changes to the fast-forward playback state. Also, when you release your finger from the fast forward button 7, the signal from there to the AND circuit AND1 changes from "1" to "0", so the AND circuit
The output signal of AND1 changes from "1" to "0",
Correspondingly, the output signal of the NOT circuit NOT2 changes from "0" to "1", and the output signal of the AND circuit AND4 also changes from "0" to "1". Therefore, the fast-forward playback state returns to the fast-forward state.

By the way, when in fast forward playback mode, play button 6
If you push , it works as follows. In other words, when in fast-forward playback mode, the AND circuit is activated.
Since the output signal of AND1 is "1", the output signal of OR circuit OR1 is naturally "1". When the playback button 6 is pushed at this time, the clock pulse is input to the clock pulse input terminal CK of the flip-flop DFL, and as a result, a signal of "1" is sent from the OR circuit OR1 to the flip-flop DFL.
It is taken into the DFL and its output signal becomes "1". But like this flip-flop DFL
Even if the output signal of AND circuit AND3 changes from "0" to "1", the signal that AND circuit AND3 receives from NOT circuit NOT1 is "0", so the output signal of AND circuit AND3 remains "0" and does not become "1". It does not change. Therefore, even if the playback button 6 is pressed during the fast-forward state, the state of the video tape recorder will not change as long as the fast-forward button 7 continues to be pressed. However, when the fast forward button 7 is released, the output signal of the AND circuit AND1 changes from "1" to "0". Then, depending on the change, OR circuit OR1
and the output signal of the NOT circuit NOT1 changes,
Both of the two signals received by the AND circuit AND3 become "1", and the output signal of the AND circuit AND3 changes from "0" to "1". Therefore, the normal playback state is established. In addition, since the NOT circuit NOT3 changes from "1" to "0" in accordance with the change,
The output signal of the AND circuit AND4 remains at "0".

Then, when the normal playback state is achieved as described above, when the fast forward button 7 is pressed again, the output signal of the AND circuit AND1 changes from "0" to "1", and accordingly, the OR circuit OR1, The output signal of NOT circuit NOT1 changes and becomes an AND circuit.
Since the output signal of AND3 changes from "1" to "0", the playback state returns to the fast-forward playback state.

The above operations are also common for changes between rewind, rewind playback, and normal playback states.

If you want to fast-forward or rewind while in the normal playback mode, first press the stop button 9 and then press the fast-forward button 7 or the rewind button 8. Then, a fast-forward state is realized under computer control. Then, the state described at the beginning in the explanation of the operation of the circuit above occurs, and an output signal of "1" is generated from either the AND circuit AND4 or the AND circuit AND5, and the output signal is sent to the flip-flop via the OR circuit OR2. DFL reset terminal R
The flip-flop DFL enters the reset state, and the output signal of the AND circuit AND3 becomes "0". In this way, the present video tape recorder is in a state in which if you press the fast forward button 7 or the rewind button 8 while fast forwarding or rewinding, the tape runs at a relatively high speed while playing while you press the button. In other words, a search state can be established in which image information is reproduced. Then, when in the search state, press the fast forward button 7 or the rewind button 8.
If you release your finger, it will return to fast forward or rewind mode. Also, if you press the play button 6 while in the search state (naturally, at this time, the fast forward button 7 or rewind button 8 is still pressed),
After that, if you release your finger from the fast forward button 7 or rewind button 8 that continues to press and release that button,
Normal playback will begin. Therefore, with such a video tape recorder, cueing is very easy.

That is, when searching for the beginning, first push the fast forward button 7 or the rewind button 8 to make the tape 24 run at high speed. When you think that the vicinity of the part you are trying to cue has reached the video head rotating drum 17, press the fast forward button 7 or the rewind button 8 again to enter the search state, and compare while playing the image on the monitor screen. Tape 24 at high speed
can be run. If you enter search mode but a part that is far away from the part you are trying to cue is still being played and fast-forwarding or rewinding is insufficient, press the fast-forward button that you are pressing your finger on. 7 or rewind button 8
You can easily fast-forward or rewind by simply releasing the button. Therefore, deficiencies in fast forwarding or rewinding can be compensated for.

Also, if a portion relatively close to the portion to which you want to cue is being played when you enter the search state where image information is played back, press the playback button 6 while keeping the fast forward button 7 or rewind button 8 pressed. (This push does not require you to keep pushing.) Then, when or just before the part you want to cue begins to play, simply release your finger from the button 7 or 8 that you are pushing. Enters playback mode. Therefore, the operation for cueing becomes very simple, and moreover, cueing can be done quickly.

Then, by pressing the fast forward button 7 or the rewind button 8 again while in the fast forward or rewind state, it is possible to enter the search state in which image information is played back. There is no need to provide a special operation button.
Therefore, it is possible to significantly downsize the video tape recorder.

As described above, the video tape recorder of the present invention is a video tape recorder that performs not only playback but also fast forwarding and rewinding while the tape storing information such as images is wound around the video head rotating drum. The operation switch for running the tape includes a playback switch for feeding the tape so that it can be played, a fast-forward switch for feeding the tape at high speed, and a rewind switch for rewinding the tape at high speed. When the fast forward switch or the rewind switch is pressed while in the rewind state, the tape runs at a speed intermediate between the running speed during fast forwarding or rewinding and the running speed during playback while the switch is pressed, and the image information is When the playback switch is further operated while in this search state and the fast-forward switch or rewind switch is released, the normal playback state is returned to. The device is characterized in that it also includes a control circuit.

Therefore, the transition from the fast-forward or rewind state to the search state in which image information is played back can be easily and extremely quickly simply by pressing and holding the fast-forward or rewind switch. To shift from the search state to the normal playback state, it is sufficient to further operate the playback switch. Therefore, cueing can be performed extremely quickly.

Further, since no special switch is required to put the video tape recorder into a search state in which image information is reproduced, the apparatus can be made smaller.

[Brief explanation of drawings]

The drawings are for explaining an example of the implementation of the video tape recorder of the present invention. FIG. 1 is an overall perspective view, FIG. 2 is a perspective view of the tape running mechanism, and FIG. 3 is a diagram showing the state of the video tape recorder. FIG. 4 is a circuit diagram showing an example of a control circuit for realizing a state depending on the operation content. Explanation of symbols, 6...Playback switch, 7...Fast forward switch, 8...Rewind switch, 17...Video head rotating drum, 24...Tape.

Claims (1)

[Scope of Claims] 1. A videotape recorder that performs not only playback but also fast-forwarding and rewinding with a tape storing information such as images wound around a rotating video head drum, which serves as an operating switch for running the tape. It is equipped with a playback switch for forwarding the tape so that it can be played, a fast forward switch for forwarding the tape at high speed, and a rewind switch for rewinding the tape at high speed, and when in the fast forward or rewind state. When the fast forward switch or the rewind switch is pressed, the tape runs at a speed intermediate between the running speed during fast forwarding or rewinding and the running speed during playback, and image information is played back. and a control circuit configured to return to the normal playback state when the playback switch is further operated in the search state and the fast forward switch or the rewind switch is released from the pressed state at the same time. A videotape recorder characterized by: