JP3034215U - Recording and playback device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a recording / reproducing apparatus capable of surely preventing a malfunction of a microcomputer due to noise in a running system of a video deck without considering the arrangement of patterns and circuit constants. A recording / reproducing apparatus that controls a traveling system by reading detection signals from a capstan motor, a drum motor, and a CTL head by a control unit and applying a drive voltage based on the detection signals to each motor. And / or when the drum motor is stopped,
The recording / reproducing apparatus is characterized in that the control unit prohibits interruption of some or all of the respective detection signals input to the control unit.

Description

[Detailed description of the invention]

[0001]

[Technology to which the invention belongs]

 The present invention relates to control of a running system of a video tape recorder. The video tape recorder is mounted on a video tape recorder for recording and / or reproducing video, audio, and control signals by using video signals as analog signals. It also includes those that record and / or reproduce all or part of them as digital signals.

[0002]

[Prior art]

 In the conventional technology, a capstan motor for running the tape, a first detection element for detecting a signal corresponding to the rotation speed of the tape, a drum motor for rotating the drum, and a rotation of the drum motor. It has a second detection element for detecting a signal corresponding to the speed, a third detection element for detecting a signal corresponding to the rotational position of the drum motor, and a head for detecting a control signal recorded on the tape. Therefore, the respective detection signals output from the above three detection elements and the head are input to the microcomputer (control unit) via the line of the traveling system and the amplifier. Further, this amplifier has a high amplification factor in order to amplify a weak detection signal. When the operation of the video deck is stopped, noise is likely to occur on the line, and the amplifier amplifies the noise, and the microcomputer may erroneously detect the amplified noise as a signal and the computer may malfunction. . Conventionally, the pattern of this line and the circuit constant have been examined to reduce the noise input to the microcomputer.

[0003]

[Problems to be solved by the device]

 However, the conventional technique cannot reliably prevent the malfunction, and there is a possibility that the malfunction always occurs depending on the variation of the constants and the noise level. Therefore, it has been desired to propose a device that reliably prevents the malfunction.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention comprises a first motor for running a tape, a second motor for rotating a drum, and a first motor. A first detection element for detecting a signal corresponding to the rotation speed, a second detection element for detecting a signal corresponding to the rotation speed from the second motor, and a signal for detecting a rotation position of the drum. And a controller for detecting the control signal recorded on the tape, and the control signal for detecting the signals output from the first, second and third detection elements and the head. In a recording / reproducing device that controls the voltage for driving the first and second motors based on the reading by the unit, when the first and / or second motors are stopped, First input And a recording / reproducing apparatus characterized in that the control section prohibits interruption of some or all signals from the detection element, the head, the second detection element and the third detection element. is there.

[0005]

DETAILED DESCRIPTION OF THE INVENTION

 When the operation of the capstan motor and / or the drum motor is stopped, some or all of the traveling system signals (CTL, C-FG and / or D-FG, D-PG) input to the microcomputer It is a program that prohibits interrupts.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing essential parts of a traveling system control unit for controlling rotation of a capstan motor which is a typical example of a first motor and a drum motor which is a typical example of a second motor according to the present invention. Is. This apparatus is a VHS (registered trademark of Victor Company of Japan, Ltd.) type video cassette recorder. First, at the time of recording or reproducing, the shaft 20 of the capstan motor 5 contacts the roller 21 to assist the running of the tape previously placed between the shaft 20 and the roller 21. Further, a band is applied between the capstan motor 5 and the gear 13, the gear 13 is rotated, the gear 18 meshing with the gear 13 is rotationally moved, and the gear 18 meshes with the gear 11. As a result, the take-up reel 15 joined with the gear 11 is rotated to wind the tape. Further, at the time of fast-forwarding or rewinding, the roller 21 is separated from the shaft 20, the gear 18 is meshed with the gear 11 or the gear 12, and the take-up reel 15 or the supply reel 19 is rotated by the above-described method, so that the tape Wind up.

Further, the capstan motor 5 incorporates a C-FG detection element 14 which is a first detection element for detecting the rotation speed of the motor, and amplifies the C-FG detection element 14 from the C-FG detection element 14. The C-FG detection pulse signal is input to the C-FG port of the microcomputer 1 which is the control unit via the circuit 8. The CTL head 15, which is a head for detecting the control signal recorded on the tape, is a reference signal for performing the phase control of the capstan servo and the stop control of the tape in STILL / SLOW mode. The detected CTL signal is input to the CTL port of the microcomputer 1 from the CTL head 15 via the amplifier circuit 7. In addition, a PWM signal {H (5V) or L (0V) digital signal} is output from the C-CONT port of the microcomputer 1, and the D / A converter 4 for converting this signal into a DC voltage and high impedance. Is supplied as a driving voltage to the capstan motor 5 via a buffer circuit 22 for converting the capstan motor 5 into a low impedance to rotate the capstan motor 5.

Next, the drum motor 3 is a motor for rotating a drum (not shown), and this motor includes a D-FG detection element 16 which is a second detection element for detecting a rotation speed and a rotation. A D-PG detection element 17 which is a third detection element for detecting the position is incorporated, and the D-FG port of the microcomputer 1 is inserted from the D-FG detection element 16 through the second amplification circuit 9. The D-FG detection pulse signal is input to the D-PG detection pulse signal, and the D-PG detection pulse signal is input to the D-PG port of the microcomputer 1 from the D-PG detection element 17 via the amplifier circuit 10. In addition, a square wave signal is output from the RF-SW port of the microcomputer 1, and this signal is input to the drum to switch between channel 1 and channel 2 of the RF head of the video head incorporated in the drum. And the drum motor 3 through the D / A converter 6 for converting the PWM signal output from the D-CONT port of the microcomputer 1 into a DC voltage and the buffer circuit 22 for converting the high impedance into the low impedance. The drum motor 3 is rotated by supplying it as a drive voltage. Here, the speed and phase of the capstan motor and the drum motor are controlled by changing the ratio of H and L of the PWM signal. For example, if the ratio of H is increased, it is supplied to the motor. When the drive voltage becomes higher, the rotation speed becomes faster, and the ratio of H is reduced, the drive voltage supplied to the motor becomes lower and the rotation speed becomes slower.

Next, FIG. 2 of a flow chart showing control of signals of the traveling system at the time of stopping and operating the drum motor will be described. First, at the start stage, the drum is in a stopped state, and interruption of D-FG and D-PG is prohibited (S1). Next, it is determined whether or not to rotate the drum (S2). When rotating the drum, D-CONT is output (S3), and D-FG and D-PG interrupts are permitted (S4). . Then, it is determined whether or not to stop the drum (S5), and when stopping the drum, the output of D-CONT is stopped (S6), and the process returns to the start stage.

Next, FIG. 3 of the flow chart showing the control of the signals of the traveling system at the time of stopping and operating the capstan motor will be described. First, at the start stage, the capstan is in a stopped state, and interrupts of C-FG and CTL are prohibited (S1). Next, it is determined whether or not the capstan is rotated (S2). When the capstan is rotated, C-CONT is output (S3) and C-FG and CTL interrupts are permitted (S4). Then, it is determined whether or not the capstan is stopped (S5), and when the capstan is stopped, the output of C-CONT is stopped (S6), and the process returns to the start stage.

The method as described above separately controls the control of the signal of the traveling system of the drum motor according to the operation of the drum motor and the control of the signal of the traveling system of the capstan motor according to the operation of the capstan motor. However, the signal of the traveling system of the drum motor and / or the signal of the traveling system of the capstan motor may be controlled according to the operation of the drum motor and / or the capstan motor.

[0012]

【The invention's effect】

 The recording / reproducing apparatus of the present invention comprises a first motor for running a tape, a second motor for rotating a drum, and a first motor for detecting a signal corresponding to a rotation speed from the first motor. Recorded on the tape, and a second detection element for detecting a signal corresponding to the rotation speed from the second motor, a third detection element for detecting a signal corresponding to the rotational position of the drum, and A head for detecting a control signal and a control unit are provided, and the control unit reads the detection signals output from the first, second, and third detection elements and the head, and based on this, the first And a recording / reproducing apparatus for controlling a voltage for driving a second motor, the first detection element and the head being input to the control unit when the first and / or the second motor are stopped. , The second detection element and the Some of the sensing element or the interruption of the whole signal, the control unit is prohibited. Therefore, it is possible to reliably prevent malfunction of the microcomputer due to noise without studying the layout of circuit patterns and circuit constants in the traveling system line.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of a traveling system control unit of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a flow chart showing control of signals of a traveling system when a drum motor is stopped.

FIG. 3 is a flow chart showing control of signals of a traveling system when the capstan motor is stopped.

[Explanation of symbols]

(1) Microcomputer (control unit) (3) Drum motor (second motor) (5) Capstan motor (first motor) (14) C-FG detection element (first detection element) (15) CTL Head (head for detecting control signal recorded on tape) (16) D-FG detection element (second detection element) (17) D-PG detection element (third detection element)

Claims (1)

[Utility model registration claims] 1. A first motor for running a tape,
A second motor for rotating the drum, a first detection element for detecting a signal corresponding to the rotation speed from the first motor, and a first detection element for detecting a signal corresponding to the rotation speed from the second motor. No. 2 detection element, a third detection element for detecting a signal corresponding to the rotational position of the drum, a head for detecting a control signal recorded on the tape, and a control section. In the recording / reproducing apparatus, the control unit reads the detection signals output from the third detection element and the head, and controls the voltages for driving the first and second motors based on the detection signals. When the second motor is stopped and / or the first detection element, the head, the second detection element and the third detection element which are input to the control unit,
2. The recording / reproducing apparatus characterized in that the control section prohibits interruption of a part or all of the signal from the detection element.