KR870003388Y1 - Video tape loose preventing circuit when service is interrupted - Google Patents
Video tape loose preventing circuit when service is interrupted Download PDFInfo
- Publication number
- KR870003388Y1 KR870003388Y1 KR2019850003253U KR850003253U KR870003388Y1 KR 870003388 Y1 KR870003388 Y1 KR 870003388Y1 KR 2019850003253 U KR2019850003253 U KR 2019850003253U KR 850003253 U KR850003253 U KR 850003253U KR 870003388 Y1 KR870003388 Y1 KR 870003388Y1
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- South Korea
- Prior art keywords
- transistor
- video tape
- power
- capacitor
- interrupted
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
- G11B15/444—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor reversing arrangements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/26—Driving record carriers by members acting directly or indirectly thereon
- G11B15/32—Driving record carriers by members acting directly or indirectly thereon through the reels or cores on to which the record carrier is wound
Landscapes
- Control Of Direct Current Motors (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
내용 없음.No content.
Description
첨부된 도면은 본 고안의 풀림 방지회로도이다.The accompanying drawings are the anti-loosening circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 마이크로프로세서 2 : 서어보회로1: microprocessor 2: servo circuit
3 : 전원부 TR1, TR2: 트랜지스터3: power supply TR 1 , TR 2 : transistor
D1, D2: 다이오드 C1, C2: 콘덴서D 1 , D 2 : Diode C 1 , C 2 : Capacitor
R1-R5: 저항 Vcc1, Vcc2: 전원 입력단자R 1 -R 5 : Resistor Vcc 1 , Vcc 2 : Power input terminal
본 고안은 비디오테이프에 영상신호를 기록 및 재생하는 비디오카세트 레코더에 있어서, 비디오테이프를 빨리감기 및 되감기할 경우에 정전이 되면, 릴을 회전시키는 구동모타를 순간적으로 역회전시켜 비디오테이프가 풀리는 것을 방지하게 한 정전시 비디오테이프 풀림 방지장치에 관한 것이다.The present invention provides a video cassette recorder for recording and playing a video signal on a video tape. When the video tape is fast rewound and rewound, the video tape is released by temporarily rotating the driving motor for rotating the reel. The present invention relates to a video tape loosening prevention device in case of power failure.
종래의 비디오카세트 레코더는 비디오테이프를 빨리감기 및 되감기를 하고 있는 상태에서 정전이 되면 빠른 속도로 회전하고 있던 구동모타가 자체의 회전 관성으로 인하여 일정시간 동안은 계속 회전하게 되므로 비디오 테이프가 풀리면서 외부로 나와 많은 흠집이 생기게 되는 등의 결함이 있었다.In the conventional video cassette recorder, when a power failure occurs while the video tape is fast rewinding and rewinding, the driving motor, which was rotating at a high speed, continues to rotate for a certain time due to its rotational inertia. There was a defect such as that many scratches came out.
본 고안은 이와 같은 종래의 결함을 감안하여, 비디오테이프의 빨리감기 및 되감기시 정전이 되면, 구동모타를 제어하는 서어보회로가 구동모타를 순간적으로 역회전시키게 함으로써 비디오테이프가 풀리는 것을 방지하게 안출한 것으로, 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention, in view of such a conventional defect, when the video tape is a power failure during fast forward and rewind, the servo circuit that controls the drive motor to prevent the video tape from loosening by instantaneous reverse rotation of the drive motor If it is described in detail by the accompanying drawings as follows.
첨부된 도면에 도시한 바와같이 전원 입력단자(Vcc1)를 다이오드(D1)및 콘덴서(C1), 저항(R1)을 통해 저항(R2) 및 트랜지스터(TR1)의 베이스에 접속하고, 트랜지스터(TR1)의 콜렉터에는 전원 입력단자(Vcc2)를 접지 콘덴서(C2) 및 저항(R3)을 통해 접속함과 아울러 트랜지스터(TR2)의 에미터를 접속하여 그 접속점을 저항(R4)을 통한 후 트랜지스터(TR2)의 베이스와 직렬 접속된 저항(R5) 및 다이오드(D2)를 접속하고, 트랜지스터(TR2)의 콜렉터는 서어보회로(2)를 제어하는 마이크로프로세서(1)의 입력단자(1)에 접속하여 구성한 것으로, 상기에서 마이크로프로세서(1)는 그의 입력단자(IN)에 고전위가 입력될때 제어신호 출력단자(OUT)로 제어신호를 출력시켜 서어보회로(2)가 구동모우터(도면에 도시되지 않았음)을 역회전 시키게하고, 콘덴서(C2)에 충전되는 전원은 콘덴서(C1)에 충전되는 전원보다 천천이 방전되게 저항(R3)및(R2)의 값을 설정하며, 도면의 설명중 미설명부호 3은 전원부로서, 내부의 콘덴서 값을 매우 크게 설정하여 정전시에도 마이크로프로세서(1) 및 서어보회로(2)에 일정시간 동안은 동작 전원을 공급하여 구동되게 한다.As shown in the accompanying drawings, the power input terminal Vcc 1 is connected to the base of the resistor R 2 and the transistor TR 1 through a diode D 1 , a capacitor C 1 , and a resistor R 1 . In addition, the power input terminal Vcc 2 is connected to the collector of the transistor TR 1 through the ground capacitor C 2 and the resistor R 3 , and the emitter of the transistor TR 2 is connected to the collector. After the resistor R 4 is connected, the resistor R 5 and the diode D 2 connected in series with the base of the transistor TR 2 are connected, and the collector of the transistor TR 2 controls the servo circuit 2. The microprocessor 1 outputs a control signal to the control signal output terminal OUT when a high potential is inputted to the input terminal IN of the microprocessor 1. by Servo circuit 2 is driven Motor (has not been shown in the drawings), and thereby the reverse-rotation, the charge on the capacitor (C 2) That power capacitors, set the value of (C 1) slowly discharge causes the resistance (R 3) and (R 2) than the power supply to be filled in, and described in the drawing, reference numeral 3 of is a power source, a capacitor value of the internal It is set very large so that the microprocessor 1 and the servo circuit 2 are supplied and operated for a predetermined time even during a power failure.
이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.
비디오 카세트 레코오더에 전원이 인가되어 전원부(3)에서 동작 전원이 출력됨과 아울러 전원 입력단자(Vcc1,Vcc2)에 전원이 입력되면, 전원단자(Vcc2)의 전원이 콘덴서(C2)에 충전됨과 아울러 전원단자(Vcc1)의 전원이 다이오드(D1)를 통해 콘덴서(C1)에 충전되면서 저항(R1)을 통해 트랜지스터(TR1)의 베이스에 바이어스 전압을 가하여 그가 온되므로 트랜지스터(TR1)의 콜렉터 전위는 저전위로 되고, 이에 따라 트랜지스터(TR2)가 오프되어 마이크로프로세서(1)의 입력단자(IN)에는 저전위가 입력되므로 서어보회로(2)가 구동모타를 정상으로 제어하게 된다.When power is applied to the video cassette recorder to output power from the power supply unit 3 and power is input to the power input terminals Vcc 1 and Vcc 2 , the power of the power supply terminal Vcc 2 is condenser C 2 . In addition to being charged to the power supply terminal (Vcc 1 ) is charged to the capacitor (C 1 ) through the diode (D 1 ) while applying a bias voltage to the base of the transistor (TR 1 ) through the resistor (R 1 ) so that it is on Since the collector potential of the transistor TR 1 becomes low, the transistor TR 2 is turned off and the low potential is input to the input terminal IN of the microprocessor 1. The control is normal.
이와 같은 상태에서 사용자가 빨리감기 버튼 또는 되감기 버튼등을 눌러 서어보회로(2)가 구동모타를 빠른 속도로 회전시키고, 정전이 되어 비디오 카세트 레코더에 인가된 전원이 차단되면 전원 입력단자(Vcc1,Vcc2)에 전원이 입력되지 않게되므로 콘덴서(C1)에 충전된 전원이 콘덴서(C1) 및 저항(R1,R2)의 시정수로 방전되고, 일정시간이 경과하여 트랜지스터(TR1)에 저전위가 인가되면, 그가 오프되므로 콘덴서(C2)에 충전된 전원이 저항(R3)을 통해 방전되면서 트랜지스터(TR2)의 에미터에 고전위를 인가 즉, 트랜지스터(TR2)에 바이어스 전압을 공급하여 그가 온되게 되므로 콘덴서(C2)의 충전전원이 저항(R3) 및 트랜지스터(TR2)를 통해 마이크로프로세서(1)의 입력단자(IN)에 입력되고, 이에 따라 마이크로프로세서(1)는 제어신호 출력단자(OUT)로 제어신호를 출력하여 서어보회로(2)가 구동모타를 순간적으로 역회전시키게 되므로 구동모타의 회전이 정지되어 릴의 회전이 정지된다.In this state, the user presses the fast-forward button or the rewind button, and the servo circuit 2 rotates the driving motor at a high speed, and when the power is cut off due to a power failure, the power input terminal (Vcc 1 , Vcc 2) the power supply is a capacitor charging to the capacitor (C 1), so the power is no longer input (C 1) and the resistors (R 1, is discharged at a time constant of R 2), a certain time by a transistor (TR When a low potential is applied to 1 ), since it is turned off, the power charged in the capacitor C 2 is discharged through the resistor R 3 , and a high potential is applied to the emitter of the transistor TR 2 , that is, the transistor TR 2 The supply voltage of the capacitor C 2 is turned on so that the charging power of the capacitor C 2 is input to the input terminal IN of the microprocessor 1 through the resistor R 3 and the transistor TR 2 . The microprocessor 1 is connected to the control signal output terminal OUT. Since the servo circuit 2 reversely rotates the driving motor by outputting a control signal, the rotation of the driving motor is stopped and the rotation of the reel is stopped.
여기서, 정전이된 순간에 마이크로프로세서(1)의 입력단자(IN)에 바로 고전위를 인가하여 구동모타를 역회전시키지 않고, 일정시간 즉, 콘덴서(C1)의 충전전원이 방전되는 일정시간 후에 구동모타를 역회전시키는 이유는 순간 정전등에 의하여 구동모타가 역회전되는 것을 방지하기 위한 것이다.Here, at a moment of power failure, a high potential is directly applied to the input terminal IN of the microprocessor 1 so that the driving motor is not reversely rotated, for example, a predetermined time for which the charging power of the capacitor C 1 is discharged. The reason why the drive motor is reversely rotated later is to prevent the drive motor from being reversely rotated by a momentary power failure lamp.
이상에서 설명한 바와 같이 본 고안은 비디오 테이프의 빨리감기나 되감기를 하고 있을 경우에 정전이되면 구동모타를 순간적으로 역회전시켜 정지시키게 되므로 비디오 테이프가 풀리는 것이 방지되어 비디오 테이프의 손상을 방지하는 효과가 있다.As described above, in the present invention, when the video tape is fast-forwarding or rewinding, when the power failure occurs, the driving motor is momentarily reversed to stop so that the video tape is prevented from loosening, thereby preventing damage to the video tape. have.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850003253U KR870003388Y1 (en) | 1985-03-27 | 1985-03-27 | Video tape loose preventing circuit when service is interrupted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850003253U KR870003388Y1 (en) | 1985-03-27 | 1985-03-27 | Video tape loose preventing circuit when service is interrupted |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR860012380U KR860012380U (en) | 1986-10-10 |
| KR870003388Y1 true KR870003388Y1 (en) | 1987-10-15 |
Family
ID=19240894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850003253U KR870003388Y1 (en) | 1985-03-27 | 1985-03-27 | Video tape loose preventing circuit when service is interrupted |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR870003388Y1 (en) |
-
1985
- 1985-03-27 KR KR2019850003253U patent/KR870003388Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR860012380U (en) | 1986-10-10 |
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