JPS62110647A - Time limit operation type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make restoration to an original state possible without damaging a head, etc., by disturbing main function by the control output of a storing means that stores timer output generated after a lapse of set time and generates control output. CONSTITUTION:A timer section 3 starts timer operation to a set time by operation of a start switch 6. In the meantime, output 106 of a servo disturbance adding section 5 disappears and the body of a VTR 1 operates normally. After a lapse of set time, the section 3 generates output 104 and makes a storage section 4 generate control output 105 and maintained in the state that can generate the output 105. On inputting the output 105, the adding section 5 generates output 106 in a servo circuit section and disturbs normal servo state. Thus, main function becomes disturbed state and maintained after the lapse of set time, and normal use becomes impossible. However, it can be restored to normal operation by specified process without damaging a tape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a time-limited magnetic recording/reproducing device configured to lose some of its original functions when a certain set time has elapsed.

Conventional technology In the past, when leasing a magnetic recording/reproducing device, the lessee did not return it even after the contract period had expired, resulting in trouble with the leasing company and a decrease in the operating rate of the leased item. There was a problem.

On the other hand, some devices, such as radios and televisions, are equipped with a timer (generally called a sleeve timer) that turns off the power after a set period of time has elapsed.

Problems to be Solved by the Invention However, this prior art is intended to prevent power wastage, and when applied to the above-mentioned magnetic recording/reproducing device, system control is performed by turning off the power after a certain period of time. The device becomes inoperable, and for example, the tape being played remains wrapped around the cylinder (drum), and even if the user operates it, it does not go into stop mode, and the tape cartridge cannot be ejected, which is an inconvenience. was to occur.

Means for Solving the Problems In order to solve the above problems, the present invention has a storage means for storing the output of the timer means generated after a set time has elapsed, and also for generating a control output. Accordingly, a disturbance adding means is provided which disturbs the main functions of the main body of the magnetic recording apparatus.

Effect of the Invention Due to the configuration of the present invention as described above, when a control output is generated after the set time has elapsed, the output disturbs the main functions of the main body of the magnetic recording apparatus, so that the original normal operation is no longer possible. is not possible, and the timer means according to the prescribed procedure,
If the storage means is reset, the original normal operation is immediately restored.

Embodiment An embodiment of the present invention will be described with reference to the block diagram of FIG. In FIG. 1, 1 is a video tape recorder (VT
R) Main body, 2 is a backup power supply unit, 3 is a timer unit that is backed up (103) by the backup power supply unit 2 and is always active, 4 is a control output (1O6) by the output (104) of the timer unit 3 that is generated after the set time has elapsed. A storage section 5 which generates and holds the generation state is a servo disturbance adding section which inputs a control output (10S) and outputs a servo disturbance signal (106) to the servo circuit section 11 of the VTR body 1.

FIG. 2 is a circuit diagram showing the specific configuration of the backup power supply section 2, in which (102) is the power input from the VTR main body 1;
01 is a diode for preventing backflow, 202 is a resistor for limiting charging current, and 203 is a capacitor. If the capacitor 203 is charged while the VTR is in normal operation, even if the power supply (101) of the VTR body 1 is turned off, the charge stored in the capacitor 203 can be extracted as a drive current with extremely low current consumption. If configured with the 0M03 circuit, the timer section 3 can be driven as a backup for several days or more using the charge stored in the capacitor 203.

Further, the backup power supply section 2 may be a dry battery or a solar battery.

FIG. 3 shows the storage section 4. 5 is a circuit diagram showing a specific configuration of a servo disturbance adding section 5. FIG. The storage unit 4 is a latching relay 40
The contact of this relay is the output of the timer section 4 (
1o4) becomes conductive and maintains this conductive state by itself,
The output of the reset circuit 7 releases the self-holding state and opens the circuit. The servo disturbance adding section 5 is a resistor 6o whose one end is connected to ground.

The operation of this embodiment will be explained below. In the current initial state, the timer section 3 and the storage section 4 are reset.

When the VTR body 1 is powered on, the capacitor 203 of the bank-up power supply section 2 is sufficiently charged. At this time,
Press the start switch etc. to start driving the timer section 3. For example, a leasing agent presses the start switch 6 when lending the device of this embodiment.

This timer unit 3 can set, for example, a scheduled elapsed time, for example, how many days, using a preset unit (not shown). Therefore, when the start switch is pressed, the timer operation starts until the set time. At this time, the output of the servo disturbance adding section 6 (1
06), therefore, the VTR main body 1 operates normally. Further, even if the power source of the VTR main body 1 is removed at this time, the operation of the timer section 3 is continued by the backup power source 2.

When the set time elapses, the timer section 3 outputs (10
4) and causes the storage unit 4 to generate a control output (1oei). The storage unit 4 then controls the control output (1OS).
is maintained in a state where it can occur. Control output (1OS)
The servo disturbance adding section 6 which receives the input outputs (
106) and disturbs the normal servo state.

In the specific example shown in FIG. 3, the latching relay 40 is set by the output of the timer section 3, the contacts are made conductive, and the resistor 60 is connected to the VTR servo circuit section 11. This resistance is 50
Since the servo constant is forcibly changed, for example, when this servo circuit section controls the rotation of a cylinder (drum), the number of rotations of the cylinder changes, causing the image to flow. (The audio is played normally).

When the servo circuit still controls the rotation of the capstan, the tape speed can be changed, so neither images nor audio will be output properly.

In addition to disturbing the servo circuits of the cylinders and capstans, the servo disturbance adding section 6 can achieve its intended purpose by disturbing the synchronization of image signals.

In this embodiment, in particular, the control output of the storage section 4 is used to control the VTR.
I try not to turn off the power to main unit 1.

This is because there is a strong possibility that the system control means will become inoperable if the power is turned off. In other words, it is enough for the user to know that the image or sound is distorted, that the user cannot repair it, and that normal operation is no longer expected, but at least the eject operation should be enabled to prevent damage to the head or tape. It is necessary.

If a servo disturbance occurs in the above manner, the output state that caused the state is retained in the storage section, so the user cannot restore the original normal state.

The reset circuit section is equipped with an input section that cannot be operated by the user, such as a switch installed inside the device or a special input form from outside the device (bar code reading, infrared or ultrasonic code input, etc.). It is activated by This reset circuit 7 resets the storage section 4 and the timer section 3. That is, by performing a reset operation when a servo disturbance is occurring, the control output from the storage section 4 disappears, and the servo returns to normal.

Further, the operation of the timer section 3 can be stopped by resetting the timer section 3 which has been set and is in operation, and the timer section 3 can be restarted by pressing the start switch 6.

As described above, according to this embodiment, if a leasing agent presses the start switch 6 to start the timer section 3 when lending this device, then after the set time has elapsed, a servo disturbance will occur and the image will be distorted. Become. Since the user cannot restore the servo to normal, the user brings it back to the leasing company, and the leasing company can reset it using a predetermined method to return it to its original state.

Effects of the Invention According to the present invention, after the set time has elapsed, the main functions become disturbed and are maintained.

In other words, normal use becomes impossible. Unlike a device in which the power is turned off after a set period of time, it is possible to realize a time-limited magnetic recording and reproducing device that does not cause damage to the head or tape.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram of a backup power supply section, and Fig. 3 is a circuit diagram showing a specific example of a storage section and a servo disturbance adding section.1. ... VTR body, 2 ... Backup power supply section, 3 ... Timer section, 4 ...
Memory section, 6... Servo disturbance addition section, 6...
...Start switch, 7...Reset circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) A timer means for setting the operating time, a constant power source section for operating the timer means, and an output of the timer means generated after the set time has elapsed as input, and generates a control output and maintains its state. A time-limited magnetic field comprising a storage means, a disturbance adding means for stopping or disturbing the main functions of the main body of the magnetic recording and reproducing apparatus when the storage means outputs a control signal, and a means for resetting the timer means and the storage means. Recording and playback device. (2) The disturbance adding means is connected to the drum servo circuit of the magnetic recording/reproducing device to change a servo constant when a control output is generated, and the disturbance adding means disturbs the reproduced image by the control output. 2. The time-limited magnetic recording and reproducing device according to item 1.