KR850001426Y1 - Recording mode locking system - Google Patents

Abstract

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Description

Record Mode Locking Device

1 is a plan view of a general video signal magnetic recording and reproducing apparatus which can be configured together with a recording mode locking apparatus according to the present invention.

2 is a schematic circuit diagram showing an embodiment of a recording mode locking device according to the present invention.

3 (a) to 3 (f) are diagrams showing signal waveforms at respective portions of the circuit shown in FIG.

The present invention relates to a recording mode locking device in a video signal magnetic recording device. In particular, in the recording and reproducing mode, the magnetic tape is taken out from a cassette and loaded on a selected line, and in the stopped mode, the loaded state is used. Even if the magnetic tape contained in the cassette is only subjected to the non-loading operation, when the power switch is turned off during the recording mode and then the power switch is turned on again, the magnetic tape has a mechanism for continuing the recording operation in the loaded state. It relates to a recording mode locking device having.

In general, a video signal magnetic recording and reproducing apparatus (hereinafter referred to as a VTR) using a cassette capable of accommodating magnetic tape, in the recording and reproducing mode, the magnetic tape is taken out of the cassette and the magnetic tape is placed on a selected tape line. A loading mechanism is provided which loads and holds the non-loading operation in which the magnetic tape is accommodated in the cassette in the stop mode.

In the VTR of the above type, when the operation mode is not switched to the stop mode in the recording mode state and the power is turned off, all mechanisms in the VTR remain in the same state as when the power is turned off, and the magnetic tape is loaded. exist. However, when the power supply is turned on again, the operating mode of the VTR is automatically stopped and all mechanisms automatically perform the non-loading operation. In such a function, no error should be inserted regardless of whether the power switch is turned ON again and the operation mode is selected, because the stop mode in which the magnetic tape is accommodated in the cassette is used for recording, reproducing, feeding forwarding, and reverse feeding forwarding. This is because various operating modes such as this are the starting point for starting.

On the other hand, a built-in battery is used as a power source in a portable VTR that records a video signal reproduced from an image pickup output obtained by using an image pickup camera.

In general, the capacity of this type of battery is not large, so to reduce power consumption, the power is turned off when the VTR is not operated. For example, when recording several programs continuously, often when one program is finished recording or when an object for image pickup is replaced, the power is turned off at the operator's will after one scene is recorded. After a certain time interval, the power is turned on and recording continues.

Therefore, in the conventional apparatus, when the power is turned off and then on again, the loading mechanism automatically performs the non-loading operation as described above, and when the recording button is pushed and operated, the loading mechanism is the recording operation of the magnetic tape. The operation of loading the magnetic tape onto the tape track selected to be performed is performed. However, when the magnetic tape in the loaded state is once unloaded and accommodated in the cassette, and the magnetic tape is taken out of the cassette to load the magnetic tape, the preceding recording end position on the instrument tape relative to the video head of the guide drum, i.e. In other words, it is not exactly returned to the original position before the non-loading operation is performed, so that a slight deviation occurs in the magnetic tape position. This separation occurs when the supply of the magnetic tape under the loaded state and the winding of the magnetic tape under the unloaded state are performed by different reels, even when the same reel is used.

As described above, when an error occurs between the recording start position of the magnetic tape and the preceding recording completion position, the recording start position and the recording completion position overlap, so that the magnetic tape is not recorded between the recording completion position and the recording start position. That is not formed. When an overlapped portion or an unrecorded portion occurs, the images do not match, and noise bars are inserted into the reproduced image. In addition, in order to write in a state where the undesirable effect is not inserted, the power source must be kept ON, which results in unnecessary power consumption.

Accordingly, a first object of the present invention is to provide a new and useful recording mode locking device capable of overcoming the above-mentioned problems in a video magnetic signal recording device, and a second object of the present invention is to provide a recording mode locking switch so that a power supply is provided. It is to provide a recording mode locking device that can continuously record the operation mode of the video magnetic signal recording apparatus by turning off the switch when it is turned on again after being turned off. According to the device of the present invention, since the operation mode does not go into the stop mode when the power is turned on again, the loading and unloading of the magnetic tape are not performed. Therefore, the next recording is performed at the tape position immediately after the preceding recording completion position. As a result, the deviation of the magnetic tape position does not occur. Therefore, no signal gap or overlap occurs at the connection portion of the magnetic tape, and no noise, video mismatch, or the like occurs. Additionally, when the apparatus according to the present invention is applied to a portable magnetic recording and reproducing apparatus having an internal battery, unnecessary power consumption can be reduced because the power can be turned off without causing any of the disadvantages described above.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In FIG. 1, the magnetic tape 10 is wound around the supply and take-up reel disks 12 and 13 accommodated in the cassette 11 to form tape rolls 10a and 10b. In the state where the magnetic tape 10 is accommodated in the cassette 11, the magnetic tape is guided to the position indicated by the dotted line l0c by the guide pins 14 and 15 between the tapes 10a and l0b. In the recording state, when the cassette 11 is loaded to a predetermined position in the magnetic recording and reproducing apparatus (hereinafter referred to as VTR), the pair of guide poles 16a, 16b and the capstan 17, which are used as tape take-out poles, From their bottom side they are inserted into the cassette 11. Therefore, the VTR enters the recording mode when the recording button is pushed after the power is turned on. In this state, the loading and unloading motor 18 is rotated, and the rotation of such a motor 18 is transmitted to the loading and unloading mechanism (not shown) via a transmission mechanism (not shown). At this time, each of the guide poles 16a and 16b is directed to the straight lines 16A and 16B by moving in the direction shown by the dashed-dotted line out of the axis in the cassette 11 in the state of mating with the magnetic tape 10. The position is reached. At this time, the guide poles 16a and 16b move while the magnetic tape is withdrawn from any of the tape rolls 10a and 10b. In addition, the construction and explanation of these mechanisms will be omitted because these transmission mechanisms for transmitting the rotation and loading and non-loading mechanisms are widely applied.

As the guide poles 16a and 16b move, the tension poles 24 provided on the tension arms (not shown) are arranged in the position shown in FIG. When the capstan 17 is rotated, the pinch roller 19 presses the capstan l7 through the raised tape 10 so that the magnetic tape 10 is driven and moved. In addition, the reeling disk 13 is rotated in the tape winding direction.

Therefore, the magnetic tape 10 drawn out from the tape roll 10a is guided by the guide pin 14 and the tension pole 24, and after the contact is made with the erase head 20 over the entire width, the guide pole It reaches the limited range by (16A) and 16B, and comes into contact with the guide drum 21 in a relatively inclined form. The guide drum 21 is composed of an upper head drum and a fixed lower head drum having a pair of video heads. When the magnetic tape 10 moves along the guide drum 21, the video signal is recorded on the magnetic tape 10 by the video head in the truck inclined with respect to the magnetic tape longitudinal direction. The magnetic tape 10 is in contact with the erasing head 22, Orio and the control head 23, and is wound on a tape roll 100b on the tape winding side in the cassette 11. The above-described tape line is a selected tape line in the loaded state.

When the operation mode of the VTR becomes the stop mode, the motor 18 is rotated in the reverse direction, and each of the guide poles 16A and 16B returns to the positions 16a and 16q indicated by the dotted lines in the cassette 11. Come. In addition, the portion of the magnetic tape 10 existing outside the cassette 11 is wound by the tape rolls 10a and 10b, and all the portions of the magnetic tape 10 are accommodated in the cassette 11 and taped. Will perform the entire operation.

When the magnetic tape 10 is accommodated in the cassette 11 and the magnetic tape 10 is pulled out of the cassette 11 according to the loaded and unloaded state of the tape, that is, used to perform the above operation. In the case where the tape roll is not specified, after the tape unloading operation is performed, when the tape loading operation is performed, the completion position of the recording track in the unloaded state may be caused by a guide drum (21) due to a cause such as elasticity of the magnetic tape. Does not recover exactly to the same location for. However, the above problem occurs when the tape roll winds the magnetic tape and draws the magnetic tape out of the cassette to the outside of the cassette. Therefore, when the video signal is recorded after the VTR is set to another operation mode, there is an overlapping portion or gap between the preceding write completion portion position and the next write start position.

The present invention eliminates this problem, and such an embodiment will be described with reference to FIG.

During normal recording, the recording locking switch 36 is kept open. However, when the power switch 30 is shorted, power is supplied to the circuit system in the VTR through the terminal 39, and the signal is directly supplied to the operation mode signal processing circuit 35 made of a microcomputer in the discriminating circuit 34. do. Therefore, the stop signal is obtained from the output terminal 41 of the operation mode signal processing circuit 38. The stop signal thus obtained is supplied to the stop circuit through the terminal 43 and applied to the base of the transistor Q ₃ in the motor drive circuit 44.

Thus, transistor Q ₃ is turned on and transistor Q ₄ is turned on. Therefore, current is supplied to the motor 18 through the transistors Q ₃ and Q _4, and the motor 18 is rotated in the reverse direction. At this time, the magnetic tape 10 in the loaded state in the VTR performs the non-loading operation. Therefore, the operation mode is set to the initial operation state. In addition, when the magnetic tape 10 is accommodated in the cassette 10 in accordance with the open state of the power switch 30, the switch 45 is in the open state, and the motor 18 does not rotate in the reverse direction.

When the write button is operated, a write operation signal is supplied to the write input terminal 38a of the operation mode signal processing circuit 38. In addition, the recording mode signal is obtained from the output terminal of the operation mode signal processing circuit 38, and the obtained recording mode signal is supplied to the recording circuit through the terminal 42 and at the same time the base of the transistor Q _{1 in} the motor drive circuit 44. Is approved. Thus, transistor Q ₁ is turned on and transistor Q _{2 is} also turned on. Current is supplied to the motor 18 through the transistors Q ₁ , Q ₂ . Therefore, the motor 18 is rotated in the forward direction, and the loading operation is performed by the guide poles 16a and 16b, and the recording operation is accompanied. In addition, an input signal is applied to each input 38b to 38e of the operation mode signal processing circuit 38 in accordance with each operation mode, i.e., regeneration mode fast-winding mode, reverse fast-winding mode, and stop mode.

The apparatus according to the present invention will now be described after the recording of one information signal is completed. The power is turned off once to save power consumption until recording of other information signals starts.

If recording continues again after the power is turned off, the recording locking switch 36 is short-circuited. The power switch 30 is opened after the tape moving device is stopped by pressing the stop button when recording of one video signal is completed as described above. The supply of power is cut off by opening the power switch 30, and the pre-operation of the VTR is stopped with the magnetic tape 10 loaded.

Then, the power switch 30 is short-circuited when recording the next video signal. Thus, as shown in FIG. 3 (a), the signal rising at time to is applied to the waveform circuit 32 composed of the exclusive-OR circuit 31, and also to the delay circuit 33. As shown in FIG. In addition, power is applied to the circuit device in the VTR through the terminal 39. The output signal b of the delay circuit 33 shown in FIG. 3 (b) is also applied to the waveform forming circuit 32 and is exclusive between the signals a) and b in the waveform forming circuit 33. -OR operation is performed. The output signal C of the waveform forming circuit 32 has a pulse width of 2 seconds, which is supplied to the first input terminal of the NAND gate 35 in the discriminating circuit 34.

The write locking switch 36 and the inverter 37 are connected in series between the ground and the second input terminal of the NAND gate 35. The potential at the recording locking switch 35 is at a low level (ground potential) as shown in (d) of FIG. 3 (d) because the recording locking switch 36 is shorted. In addition, the high level signal e of FIG. 3 (e) is applied to the second input terminal of the NAND gate 35 through the inverter 37. As a result, the signal f shown in FIG. 3 (f) is obtained from the NAND gate 35, which is supplied to the operation mode signal processing circuit 38. As shown in FIG.

When the signal f is supplied to the operation mode signal processing circuit 38, a write mode signal is generated through the output terminal 40, which is supplied to the recording circuit through the terminal 42. The operation state of the write circuit is a write operation state. The recording mode signal is supplied to the motor drive circuit 44, but since the VTR is in the loaded state, the switch 45 is opened, and the motor 18 is not loaded in the loaded state, that is, in the forward direction. Thus, the magnetic tape 11 is maintained in the loaded state as the selected tape barrel.

Therefore, when the power switch 30 is short-circuited again, the recording operation is immediately performed, but at this time, the non-loading and loading operation of the magnetic tape 10 is not performed, and the position of the magnetic tape does not change, so that the next video signal is the power switch. It is possible to record immediately after the recording completion position of the magnetic tape formed before the 30 is opened. Therefore, there is no overlap or gap between the previous recording completion position and the current recording start position.

When the stop button (not shown) is pressed after the recording is completed, the stop operation signal is applied to the terminal 38e of the operation mode signal processing circuit 38. Therefore, a stop signal is generated at the output terminal 41 of the operation mode signal processing circuit 38, and the stop signal is supplied to the next stage circuit through the terminal 43. In addition, the transistors Q ₁ and Q ₄ of the motor driving circuit 44 are turned on, and the motor 18 is rotated in the reverse direction so that the deloading operation of the magnetic tape 10 is performed.

For continuous recording after the power switch 30 is opened by the shorting of the locking switch 36, the locking switch 36 is a time interval (ie pulse) of the signal C from the time when the power switch 30 is shorted again. By width, it can be shorted at any time within 2 seconds).

The reason for providing a 2 second time interval (pulse width) between the signals (c) and (f) is that the operator incorrectly shorts the locking switch 36 during the regeneration mode of the VTR after the power switch 30 is shorted. This is to prevent the VTR from entering the recording mode for a predetermined time (2 seconds).

In addition, the present invention is not limited to the above embodiments within the scope of the present invention, various modifications are possible.

Claims (1)

A power supply means for operating between a loaded state and a non-loaded state, a magnetic tape 10 loaded into a tape track at a predetermined position, and being unloaded in the loaded state, and supplying power to a video signal magnetic recording apparatus; A recording mode locking device in a video signal magnetic recording apparatus comprising a power switch 30 which is shorted or opened to cut off, and means for causing the loading means to perform a non-loading operation when the power switch is shorted. And a lock switch means 36 which is activated to lock the power supply, wherein the operation mode signal generating means 38 generates a recording mode signal in a state where the power switch 30 is short-circuited. Mode locking device.