KR19990041370A - How to drive a video cassette recorder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the driving of a video cassette recorder, comprising: a light emitting unit (102) for generating a predetermined optical signal in a playback mode of a video cassette recorder, and an inserted video tape (402). The optical sensor is selectively input according to the position of the transparent part 404 of the sensor, and includes an end sensor 104 for generating a first or second logic signal according to whether the optical signal is inputted. When a first logic signal is provided from which the optical signal of the light emitting unit 102 is not inputted, the video cassette recorder is reproduced and driven, and a second logic signal from which the optical signal of the light emitting unit 102 is input from the end sensor 104 is supplied. If provided, controlling the video cassette recorder to drive in the high speed drive mode (FF) for 2-3 seconds until the first logic signal is provided.

That is, the present invention drives the video tape 402 at a high speed for a predetermined time until the transparent portion 404 of the inserted video tape is not detected, thereby preventing breaks of the video tape 402 as well as the video cassette recorder. It is effective in preventing circuit defects in advance.

Description

How to drive a video cassette recorder

The present invention relates to a video cassette recorder (hereinafter abbreviated as V-seal), and more particularly, when the transparent portion of the inserted video tape is detected, the V-seal is automatically driven in the high-speed driving mode (FF) for a predetermined time. The present invention relates to a method of driving V-Cal to prevent break of the video tape when the video tape is loaded.

V-Cal is a device for recording a received broadcast signal on a video tape which is a magnetic body by using a video head mounted on a rotating head drum, or reading and outputting video and audio signals recorded on the video tape.

The V-C is equipped with a light emitting and receiving portion (end sensor or start sensor) for detecting the end of the video tape. That is, the video tape is produced by connecting a transparent part of a certain length to the end thereof, and the optical signal generated from the above-described light emitting part, for example, a light emitting diode (LED), during driving (rewinding, recording, playing, etc.) of the inserted video tape. In the case where the call passes through the transparent portion of the video tape, that is, when an optical signal is input to the light receiving portion, for example, a photo transistor, the VRC determines the end of the video tape.

Accordingly, V-CAL stops the mode in progress in response to the above-described end detection signal of the video tape, thereby preventing the video tape from being wound to the end of the transparent portion.

This mechanism prevents breakage of the video tape and damage to the device when the videotape is played back or recorded (ie, loaded) later. That is, when the video tape is loaded, the video tape is pulled out by a certain length by a loading post, a tension arm, etc. in the V-LC deck and closely adhered to the head drum, so that the video tape is in a reel shape. It will be readily apparent to those of ordinary skill in the art that there should be some remaining in the to facilitate loading.

On the other hand, so-called video tape rental shops are widely used in renting a large amount of video tapes at a low price to satisfy a variety of viewing needs of video viewers.

These video tape rental stores are equipped with a rewinder, a rewinding device for rewinding the recovered video tape in a short time. That is, a rewinder is a device that performs a fast rewind mode (REW) when the video tape is not loaded (recording, playback mode, etc.) but is unloaded (the video tape is not in close contact with the head drum). It is configured to automatically perform fast rewind mode when seated on the rewinder.

By the way, since the rewinder is not equipped with the light-emitting part and the light-receiving part which are the end detection means mentioned above, the case where the video tape was rewound to the end without leaving to some extent on the reel has arisen.

When renting such a video tape and playing it with V-als provided in each home, that is, loading, the video tape breaks, or a circuit defect of V-seals occurs.

Accordingly, the present invention has been made to solve this problem, and when the transparent portion of the inserted video tape is detected, the V-real time is automatically driven in the high-speed driving mode (FF) to prevent the video tape from breaking when loading the video tape. It is an object of the present invention to provide a method of driving V-Cal.

That is, according to the present invention, the light emitting unit which is mounted on the center lower surface of the deck and generates an optical signal according to a predetermined control signal, and the first or second logic signal depending on whether the optical signal generated by the light emitting unit is input or not A method of driving a V-Cal having a light receiving unit for selectively outputting the data, comprising: a first step of determining whether a reproduction key signal is applied to the V-Cal; A second step of emitting the light emitting part when a reproduction key signal is applied; Detecting a logic signal input of the light receiving unit according to the generation of the optical signal of the light emitting unit; A fourth step of regenerating and driving V-C corresponding to the first logic signal of the light receiver; And a fifth step of driving the V-C in the high-speed driving mode for a predetermined time until the first logic signal is input in response to the second logic signal of the light receiving unit.

1 is a schematic block diagram of a video cassette recorder for carrying out the method according to the invention;

2 is a state diagram of a video cassette and a deck for explaining the method according to the present invention;

3 is a flowchart of a process of performing a method of driving a video cassette recorder according to the present invention;

<Description of Symbols for Main Parts of Drawings>

100: deck 102: light emitting unit

104: light receiving unit 106: reel motor driving unit

200: microcomputer 300: key input unit

400: video cassette 402: video tape

404: video tape transparency

The above objects and various advantages of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a V-Cal for performing the method according to the present invention, which includes a light emitting unit 102, a light receiving unit 104 and a reel motor driving unit 106, a microcomputer 200 and a key input unit 300 in a deck. Each).

Prior to the description of the block diagram, the light receiving portion 104 according to the present invention may employ a start sensor that detects the video tape transparent portion on the take-up reel side of the video cassette, and does not adopt the end sensor. This is because most of the video tapes borrowed from the video rental store are rewinded.

As shown, the key input unit 300 has a plurality of function keys (not shown) for controlling the operation of the V-Cal, such as the fast travel (FF) and the fast rewind (REW) keys, and is input, that is, the user It is configured to apply a key signal corresponding to the key pressed by the microcomputer 200.

The light emitting unit 102 is mounted on the center lower surface of the deck in the V-Cal, and is inserted into the lamp insertion hole of the video cassette when the video cassette is seated on the deck. In addition, the light emitting unit 102 generates a predetermined optical signal under the control of the microcomputer 200.

The light receiver 104 includes a photo transistor, and outputs a predetermined first or second logic signal depending on whether an optical signal generated from the light emitter 102 is input.

The logic signal output according to the presence or absence of the optical signal input is determined according to the position of the transparent portion 404 of the unloaded video tape, as shown in the detail view of the deck 100 on which the video cassette 400 of FIG. 2 is seated. That is, when the transparent portion 404 of the video tape deviates between the light emitting portion 102 and the light receiving portion 104, the optical signal generated by the light emitting portion 102 does not pass through the video tape 402, and thus the optical signal is transmitted to the light receiving portion 104. Since it is not input, the light receiver 104 outputs a first logic signal, for example, a low signal. When the transparent portion 404 of the video tape is positioned between the light emitter 102 and the light receiver 104, the light emitter Since the optical signal generated at 102 passes through the transparent part 404 and is input to the light receiving part 104, the light receiving part 104 outputs a second logic signal, for example, a high signal.

Returning to the block diagram of FIG. 1 again, the reel motor driver 106 selectively runs the video tape 402 inserted under the control of the microcomputer 200. That is, the reel motor driving unit 106 rotates the reel motor (not shown) at a predetermined speed in accordance with the high speed F.F or high speed rewind control signal of the microcomputer 200.

Hereinafter, with reference to the above-described configuration, the microcomputer 200 according to the present invention will be described in detail with reference to the flowchart of FIG.

First, when the video cassette 400 rewinded by the user is inserted into the deck 100 of the VR, the microcomputer 200 determines whether a reproduction key signal is applied from the key input unit 300 in step S100.

As a result of the determination in step S100, when the reproduction key signal is applied, the microcomputer 200 outputs a power control signal for causing the light emitting unit 102 to emit light. In response to the power control signal, the light emitting unit 102 generates a predetermined optical signal (S102).

In step S104, the microcomputer 200 detects a logic signal input of the light receiver 104 according to whether the light emitter 102 has an optical signal. As a result of the detection in step S104, when a first logic signal of the light receiving unit 104, for example, a low signal is provided, that is, a recordable video tape 402 is positioned between the light emitting unit 102 and the light receiving unit 104 to emit light. If the optical signal generated by the unit 102 is not input to the light receiving unit 104, the microcomputer 200 sets the reel motor driver 106 to a reproduction mode corresponding to the reproduction key signal of step S100 described above. It is assumed that the tape 402 is pulled out to a predetermined length and driven in a loading state in close contact with the head drum.

If, as a result of the detection of step S104, a second logic signal of the light receiving portion 104, for example a high signal, is provided, that is, the transparent portion 404 of the video tape between the light emitting portion 102 and the light receiving portion 104 is provided. When the optical signal generated in the light emitting unit 102 is input to the light receiving unit 104, the microcomputer 200 drives the reel motor driving unit 106 in the high speed driving mode FF for a preset time, for example, 2 to 3 seconds. (S108).

The control of this step S108 is that the recordable video tape 402 is not the transparent portion 404 until the first logic signal is applied to the microcomputer 200, that is, between the light emitting portion 102 and the light receiving portion 104. Is repeated until is located, and when the first logic signal is applied, the microcomputer 200 drives the reel motor driver 106 in the regeneration mode.

As described above, according to the present invention, the video tape is driven at a high speed for a predetermined time until the transparent portion of the inserted video tape is not detected, thereby preventing the break of the video tape and preventing the circuit defect of the V-seal in advance. There is.

Claims (2)

The light emitting unit 102 is mounted on the center lower surface of the deck 100 of V-Cal and generates an optical signal according to a predetermined control signal, and according to whether or not an optical signal generated from the light emitting unit 102 is inputted, A method of driving a V-Cal having a light receiving unit 104 for selectively outputting a second logic signal, A first step (S100) of determining whether a reproduction key signal is applied to the VRC; A second step (S102) of causing the light emitting unit to emit light when the reproduction key signal is applied; A third step (S104) of detecting a logic signal input of the light receiving unit 104 according to the light signal generation of the light emitting unit 102; A fourth step (S106) of regenerating and driving the V-C corresponding to the first logic signal of the light receiver 104; And a fifth step (S108) of driving the V-C in the high speed driving mode for a predetermined time until the first logic signal is input in response to the second logic signal of the light receiver 104. How to drive V-Cal. The method of claim 1, wherein the predetermined time is 2 seconds to 3 seconds.