KR19980075507A - How to avoid damaging video cassette tapes - Google Patents

Abstract

According to the present invention, when a problem occurs in the driving mode of a video cassette recorder and the VCR is switched to the emergency mode, the video tape is excessively discharged in a slack state in which the video tape is loose or jammed in the deck. In order to solve the problem that the video tape is damaged, rewind the tape for a predetermined time in the direction opposite to the driving direction before switching to the emergency mode, and then try to eject the tape, and stop the eject operation if it is not ejected by the preset time. This prevents the video tape in the deck of the VCR from being damaged.

Description

How to avoid damaging video cassette tapes

The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a video cassette tape mounted on a VCR deck when an abnormality such as jam occurs in the VCR. The present invention relates to a method of preventing damage to a video cassette tape for preventing damage to a video cassette tape).

The VCR is a device that selectively magnetizes a video tape, which is a magnetic material, to a head to record video and audio signals on a video tape or to read video and audio signals recorded on a video tape with a head.

Here, the operating principle of the VCR is a contact formed in each driving mode of the VCR, that is, a play, a record, a fast backward mode, a fast forward mode, a fast forward mode, a stop mode, and the like. When the cam switch is connected and switched at each contact formed, the capstan motor rotates the take-up reel or the supply reel at a constant speed corresponding to each driving mode. Drive in a predetermined direction.

At this time, the drum motor has a configuration in which a video signal can be read and recorded by rotating a head drum to helically scan the video tape with the video head.

On the other hand, if an abnormal condition such as a jam (a state in which the video tape is entangled between parts) occurs due to any of the above-described operation processes, the rotation of the reel is detected by a magnetic or optical sensor and detected in the driving mode. If the reel's rotation state does not match the reel's rotational speed preset in the microcomputer's memory, it will switch to emergency mode to control the microcomputer and eject the video tape out of the deck. In addition to the function of the eject key), all VCR functions are stopped.

At this time, under the control of the microcomputer, the display unit located on the front panel of the VCR displays the emergency mode state, and the tape was ejected by manual operation of a user who recognized that an abnormality occurred in the VCR.

However, in the conventional method as described above, when the video tape is loosely slack or a jam state in which the video tape is entangled between the parts, the video tape is broken or the image quality is degraded due to excessive ejection. there was.

Accordingly, the present invention has been made in order to solve the above-described problems, the tape is mounted in the deck of the VCR by performing the pre-operation that can prevent the tape damage before ejecting in the video cassette recorder when an abnormality such as jam occurs An object of the present invention to provide a method for preventing damage to a video tape that can prevent the damage of the.

In order to achieve the above object, in the present invention, the deck unit for mounting the video tape, the detector for detecting the rotational speed of the reel, the detection speed detected from the detector and the preset speed according to each mode of the VCR does not match. A microcomputer for generating a deck driving control signal by switching to the emergency mode, a deck driver for driving the deck according to the deck driving control signal from the micom, and a time for the deck unit to be driven by the deck driver. In a VCR equipped with a deck drive control device including a counter for counting, if the rotational speed of the reel detected by the detection unit does not match the rotational speed of the reels stored in the microcomputer memory according to each mode, the emergency mode is changed to the emergency mode. A first step of stopping after waiting for all key functions until a key signal is input; A second step of generating a deck driving control signal when the emergency key signal is input in the first step and rewinding the video tape in the deck for a preset time stored in the microcomputer memory; A third step of attempting to eject the video tape by generating a deck driving control signal for ejecting the video tape in the deck after the rewinding of the video tape in the second step; If the video tape is ejected as a result of the third step, the emergency mode is canceled, and if the video tape is not ejected, a driving control signal is generated for a preset time stored in the microcomputer memory to attempt to eject the video tape. 4 steps; And a fifth step of stopping generation of a driving control signal when the video tape is not discharged for a preset time stored in the microcomputer memory in the fourth step.

1 is a block diagram showing an apparatus for preventing damage to a video cassette tape for carrying out the present invention;

2 is a flowchart illustrating a method of preventing damage to a video cassette tape according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: detector 200: micom

300: counter 400: deck drive unit

500: deck portion 600: key input portion

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

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

1 is a block diagram showing a portion of a video cassette recorder for carrying out the present invention, which comprises a detector 100, a microcomputer 200, a counter 300, a deck driver 400, and a deck 500. .

In the figure, the detection unit 100 is composed of a magnetic or electrical sensor, detects the rotational speed of the reel and transmits to the microcomputer in the form of a pulse (Pulse).

The microcomputer 200 compares the rotational speed of the reels transmitted from the detection unit 100 with the rotational speeds of the reels according to the respective modes stored in the memory of the microcomputer 200, and if not, switches to the emergency mode. Thus, all functions of the VCR except for the key input unit 600 are stopped and waited until the emergency key signal is input from the key input unit 600. In addition, when the emergency key signal is input from the key input unit 600, the counter counts the time counted from the counter 300 and generates a deck drive control signal for driving the deck driver for a preset time stored in the memory in the microcomputer 200. do.

The counter 300 counts the time that the deck driver 400 is driven by the driving control signal generated by the microcomputer 200 and provides the counter to the microcomputer 200.

The deck driving unit 400 includes a capstan motor driving unit and a loading motor driving unit, and the deck driving signal for driving the capstan motor or the loading motor by the deck driving control signal generated by the microcomputer 200. Occurs.

The deck unit 500 includes a capstan motor for rewinding the video tape mounted on the deck unit 500, a loading motor for discharging the video tape out of the deck unit, and a deck for mounting the video tape. Capstan motor is driven by the deck drive signal of the deck drive unit 400 to rotate the tech-up reel or supply reel at a constant speed corresponding to each drive mode to drive the video tape in a predetermined direction, the loading motor is deck Drive by the deck drive signal of the drive unit 400 to discharge the video tape.

The key input unit 600 is a remote controller composed of a plurality of key matrices or a key panel mounted at a predetermined position of the VCR. The key input unit 600 provides a key signal to the microcomputer 200 by a user's key manipulation.

Fig. 2 shows a method of preventing damage to a video cassette tape according to the present invention made in a video cassette recorder having the above-mentioned members.

As shown in step 10 of the figure, when the VCR is in a driving mode such as playback, recording, fast forward, fast reverse, etc., the running speed of the VCR detects the rotational speed of the reel in the detection unit 100 made of an electronic or electrical sensor. It is provided to the microcomputer 200 in the form of a pulse.

Then, as shown in step 20, the rotational speed of the reel detected by the detection unit 100 is compared with the rotational speed according to each mode preset and stored in the memory in the microcomputer 200 in the microcomputer 200.

At this time, if the comparison result in step 20 matches the detection speed and the preset speed, the current driving mode is maintained. If the comparison result does not match, the VCR mode is switched to the emergency mode, and a key input unit for inputting an emergency key signal ( All functions of the VCR except 600) are stopped and maintained until an emergency key signal is input (step 30).

On the other hand, the state of the video tape in step 30 is that the video tape is loosely entangled or entangled while driving, so that the video tape is rewound for a predetermined time in the reverse direction to the traveling direction before switching to the emergency mode, thereby eliminating the abnormal state of the video tape. I need to do it.

In addition, the time required to rewind the video tape is sufficient to solve the abnormal state, and it should be considered that the long time operation beyond the time range that the abnormal state is solved is eliminated. .

Therefore, when an emergency key signal is input to the microcomputer 200 from the key input unit 600 in step 40, the microcomputer 200 generates a deck driving control signal for driving the capstan motor and generates the deck driving unit 400.

At this time, the deck drive signal is generated in the deck driver 400 by the deck drive control signal from the microcomputer 200, and the capstan motor constituting the deck part 500 is driven by the deck drive signal of the deck driver 400. Rewind the tape.

The tape rewinding time due to the driving of the capstan motor is counted by the counter 300 and provided to the microcomputer 200, and the microcomputer 200 counts the time counted by the counter 300 in the memory of the microcomputer 200. When the time coincides with the preset time, a deck driving control signal for stopping the driving of the capstan motor is generated and provided to the deck driving unit 400, and accordingly, the deck unit 500 is generated by the deck driving signal generated by the deck driving unit 400. Capstan motor is stopped to stop the tape rewinding operation (step 50).

When the step 50 is completed and the capstan motor is stopped, the reel speed detected by the detection unit 100 and provided to the microcomputer 200 becomes 0. Accordingly, the microcomputer 200 discharges the VCR to discharge the video tape. Switch to mode (step 60).

As the VCR is switched to the discharge mode in step 60, the microcomputer 200 generates a deck drive control signal for driving the loading motor to discharge the video tape and generates the deck drive unit 400.

At this time, the deck drive signal is generated in the deck driver 400 by the deck drive control signal from the microcomputer 200, and the loading motor constituting the deck part 500 is driven by the deck drive signal of the deck driver 400. To perform the ejection operation of the video tape.

On the other hand, the time for performing the discharge operation of the video tape by driving the loading motor in step 60 is counted by the counter 300 is provided to the microcomputer 200.

In step 70, it is determined whether the video tape has been discharged by the above-described process of step 60. If the video tape has been discharged as a result of the determination, the above-described series of processes for protecting the video cassette tape are completed according to the present invention. If the video tape has not been ejected, the video tape may not be ejected until the ejection operation time of the video tape counted by the counter 300 reaches the preset ejection operation time limit stored in the memory of the microcomputer 200 as in step 80. Perform the eject operation.

At this time, when the ejection operation execution time of the video tape is preset in the memory in the microcomputer 200 and the stored ejection operation time limit is compared with the preset result in step 80, the ejection operation execution time of the video tape matches the preset ejection operation time limit. The microcomputer 200 generates a deck driving control signal for stopping the driving of the loading motor and provides the deck driving control signal to the deck driving unit 400, and accordingly, the deck driving signal generated by the deck driving unit 400 generates a deck driving signal. The loading motor is stopped to stop the rewinding operation (step 90).

In the above, the ejection operation time limit of step 90 is to prevent the video tape from being damaged by attempting to eject it excessively for a long time in a state where an abnormality occurs in the video tape and is not ejected, so that the preset time is the ejection of the video tape. It may be desirable to consider the time elapsed and the time that the video tape is damaged due to the driving of the loading motor 600.

As described above, according to the present invention, the video cassette tape is prevented from being damaged by controlling the operation of the deck portion so as not to eject the video cassette tape excessively for a long time in an abnormal state such as slack or jam when an error occurs in the video cassette recorder. This can prevent loss of information recorded on the video cassette tape.

Claims (1)

Deck part for mounting the video tape, detection part for detecting the rotational speed of the reel, when the detection speed detected from the detection unit and the preset speed according to each mode of the VCR does not match the deck drive control signal Deck drive control apparatus including a microcomputer for generating a; a deck driver for driving the deck by the deck drive control signal from the microcomputer; and a counter for counting the time the deck unit is driven by the deck driver; In the VCR with If the rotational speed of the reel detected by the detection unit does not match the rotational speed of the reel stored in the memory of the microcomputer according to each mode, after switching to the emergency mode, all key functions are stopped until the emergency key signal is input and then First step; A second step of generating a deck driving control signal when the emergency key signal is input in the first step and rewinding the video tape in the deck for a preset time stored in the microcomputer memory; A third step of attempting to eject the video tape by generating a deck driving control signal for ejecting the video tape in the deck after the rewinding of the video tape in the second step; If the video tape is ejected as a result of the third step, the emergency mode is canceled, and if the video tape is not ejected, a driving control signal is generated for a preset time stored in the microcomputer memory to attempt to eject the video tape. 4 steps; And a fifth step of stopping the generation of a drive control signal when the video tape is not discharged for a preset time stored in the microcomputer memory in the fourth step.