KR980011026A - Vishial system with deterioration tape compensation - Google Patents

Abstract

The present invention relates to a means for compensating for the residual magnetism of the tape when the tape used in the Vsial system is deteriorated due to use for a long time to compensate for keeping the tape in the same state as the initial use state. However, it has been difficult to reconstruct the deteriorated tape by the circuit technology, and the quality of the recorded program is poor due to the use of such a tape. It was a problem.

In order to solve such conventional problems, it is an object of the present invention to provide a Vishal system including a system microcomputer, a full width erasing head, and the like in a Vishial system, A head cleaner 13 for removing foreign substances on the surface during tape running and a residual magnetic flux eliminator 11 provided at the rear end of the head cleaner 13 for absorbing the residual magnet in a strong magnetic field And a degradation tape compensation function is given.

Description

Vishial system with deterioration tape compensation

The present invention relates to a processing means capable of automatically returning to a starting point of a tape after the end of recording in a video cassette recorder (hereinafter referred to as VCR) system, and more particularly to a processing means for automatically returning a tape to a recording start point .

VISIR has a function of recording a video signal provided from various regular broadcast programs or an external video source on a tape or providing a playback video screen through a TV receiver. As shown in Fig.

Here, a tuner 202 for receiving a regular broadcast signal from an antenna of a Vishal system and performing a channel selection operation; A timer unit 203 for providing time data such as various reservation modes and time data through the display unit 204; A display unit 203 for displaying various data provided from the timer unit; A video processing unit 204 for processing a signal reproduced by a deck unit or the like or a signal provided from an external video source; An audio unit 207 for processing an audio signal, a reel motor RL for driving a deck mechanism on the system deck side, a servo control unit 208 for controlling a loading motor LM, a capstan motor CM and the like; Remote control receiver 209; A mechanism part 206 connected to the operation switch part 210 on the set side key part side, the reel motor RL and the loading motor LM, the pinch solenoid PS, the brake solenoid BS and the like; (CS), end sensor (ES), start sensor (SS), record safety switch (RSS), counter memory (CM), overloading switch (ALS), unloading switch (US), a drum F / F switch (DFF), a reel pulse generator (RFG), and the like are connected; A microcomputer 201 for system control, and the like.

Fig. 2 shows the configuration of the running system in the above system.

A cassette tape margin (CST), a full width erasing head (FE), a head drum (HD), an audio / control signal head ac head (AC), a capstan reel (CA), and the like. On the other hand, (CST) lamp CS is provided between the take-up reel SR and the take-up reel TR and the end sensor ES on the side of the supply reel SR optically acting on the take- And a start sensor SS on the take-up reel TR side.

The recording and reproducing operations of the video head and the magnetic tape related to the present invention in this Vishial system are shown in FIGS. 3 and 4.

Here, when a recording signal current is applied to the coil 72 of the head 7 when a signal is written to the magnetic tape 8 as shown in FIG. 3 (a), the gap a of the core 71 having the gap a A leakage magnetic field hd is generated through the side of the recording magnetic field hd and magnetizes the magnetic tape 8 running in a certain direction by the magnetic field hd. So that the regenerative voltage is generated in the coil 72. As a result,

The magnetic equivalent circuit is shown in FIG. 5 as a state in which the magnetic tape 8 interacts with the core 71 of the head 7.

6 (A) shows a magnetic equivalent circuit at the time of recording, and FIG. 6 (B) shows a magnetic equivalent circuit at the time of reproduction. Here, H denotes the magnetomotive force of the coil 72, Rc is the magnetoresistance of the core 71, Rd is the leakage resistance, Rg is the gap resistance, and R1 is the tape magnet layer resistance.

In this conventional system, when the user records a new program on the tape using the video heads of the third to fifth embodiments arranged on the video head drum HD side of the second example, the full width erasing head FH This is a neutralization operation that makes magnetic components on the tape into initial magnetization components, and new recording is performed while erasing the previously recorded program.

However, in the case of a deteriorated tape which can not completely erase the previous program during the erasing operation or which has been used repeatedly for a long period of time for the recording / erasing work, magnetic residue or the like exists on the surface of the tape, And the image quality at the time of reproduction has been remarkably lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a full width erasing head which is capable of improving the reproduced picture quality due to a tape deteriorated in the system, It is possible to remove residual magnetic and foreign substances on the tape by using the residual magnetic field and the tape cleaner, thereby preventing deterioration of reproduction quality when using such deteriorated tape.

The present invention particularly relates to a head cleaner provided at a front side of a tape feeding side of a full width erasing head in a traveling system of the system to remove foreign matter on the surface during running of the tape so as to realize the object of the above example, And a residual magnetic canceller for absorbing the residual magnet with a strong magnetic field and a residual magnetic canceller circuit for driving the residual magnetic canceller by the depressed state of the record button

And is characterized by a Vishal system having a deterioration tape compensating function with a built-in configuration.

Figure 1 is a circuit block diagram of a conventional Vishal system.

FIG. 2 is a reference diagram showing a traveling system in FIG.

FIGS. 3a and 3b are views for respectively showing the operation principle of recording and recording of a magnetic head in a general Vishal.

4 is a reference view of the magnetic head related to the third aspect;

FIG. 5 is an equivalent circuit diagram related to FIG. 3;

6A and 6B are reference views showing magnetic equivalent circuits at the time of recording and reproduction.

7 is a reference diagram of a running system equipped with a residual magnetic decay of the present invention. FIG. 8 is a reference diagram showing a drive circuit in a residual magnetic flux in FIG. 7.

DESCRIPTION OF THE REFERENCE NUMERALS

1. Residual magnet erase circuit 11. Residual magnetoresistive

12. Blower drive part 13. Tape cleaner

14. Microcomputer

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

FIG. 7 shows the traveling system of the Vishal system having the deteriorated tape compensating function according to the present invention.

Here, the head cleaner 13 is provided on the front side of the tape feeding side of the normal traveling-system full-width erasing head FE to remove foreign matter on the surface during traveling of the tape, and a head cleaner 13 provided at the rear end of the head cleaner 13, There is provided a residual magnetic field eliminator 11 for absorbing the residual magnet and the position of the head cleaner 13 with respect to the full width erasing head FE is not limited.

The residual magnetism elimination circuit 1 related to the residual magnetic erosion 11 is shown in Fig.

A microcomputer 14 for receiving the recording state signal REC (L) of the recording button and pulse-driving the light-out driving section 12, and a microcomputer 14 connected to the output port of the microcomputer 14, And a residual magnetic field eliminator 11 connected to the output side of the small-bore driving section 12 and serving as an electromagnet.

The burn-in driving unit 12 includes two transistors 12a and 12b serving as a signal amplification and switching unit, and this circuit may have various configurations such as an inverter logic equivalent to this.

In the present invention having such a configuration, when a user performs a recording operation using a traveling system of a vial system, when the user presses a recording button, the traveling system of the system proceeds to record a predetermined program as in the normal operation. On the other hand, The microcomputer 14 of the residual magnetism elimination circuit 1 of the present example is provided with a recognition signal for this and the microcomputer 14 drives the electromagnet of the residual magnetite eliminator 11 The drive pulses are supplied to the drive circuit. The residual magnetic susceptor 11 absorbs magnetized magnetic suspended solids adhering to the surface of the running tape as a strong magnetic field in the seventh aspect. On the other hand, the residual magnetic destruction precursor 11 absorbs minute foreign matter adhered to the tape by the tape cleaner 13 And the like.

The transistors 12a and 12b of the destructive driving unit 12 act to drive the driving pulses provided by the microcomputer 14 to the residual magnetic destinator 11 and the residual magnetic destinator 11 is driven by a solenoid It becomes an electromagnet.

In the present invention, when recording a deteriorated tape using a Vishal system, the quality of the recorded signal due to the residual magnetic foreign substances is deteriorated by removing the magnetic component foreign substances remaining on the tape surface simultaneously with the recording, It is possible to satisfactorily improve the problem that the image quality at the time of reproduction can not be obtained satisfactorily.

Claims (3)

A system cleaner, a system microcomputer, and a full-width erasing head. The head cleaner 13 is provided on the upstream side of the tape feeding side of a normal traveling system full width erasing head FE to remove foreign substances on the surface during running of the tape. (11) provided at the rear end of the head cleaner (13) and absorbing the residual magnet by a strong magnetic field. A residual magnetism elimination circuit (1) according to claim 1, characterized in that the residual magnetism elimination circuit (1) associated with the residual magnetic erosion eliminator (11) A microcomputer 14 connected to the output port of the microcomputer 14 for driving the residual magnetic susceptor 11 and a drive circuit 12 connected to the output side of the microcomputer 14, (11) which performs the role of an electromagnet. ≪ RTI ID = 0.0 > 11. < / RTI > The Vishill system as claimed in claim 1, wherein the destructive driving unit (12) comprises two transistors (12a, 12b) for signal amplification and switching. ※ Note: It is disclosed by the contents of the first application.