KR100187002B1 - Apparatus for speed control of jog-shuttle - Google Patents

Abstract

In the jog / shuttle device of a video signal player, the light emitting unit converts an electrical signal into an optical signal, and the light emitting unit converts an electric signal into an optical signal, and is different according to each part of the reflective surface divided at regular intervals according to rotation of the jog or shuttle key. A reflector having a reflectance, a first light receiving unit that receives light reflected from the first region of the reflector and converts the light into an electrical signal, and receives and reflects light reflected from a second region different from the first region of the reflector And a signal processing unit for outputting a servo control signal commonly used for rotation of the jog or shuttle key by dividing a jog or shuttle mode according to the output of the first and second light receiving units. A speed control device of a jog / shuttle device. The jog / shuttle mode can be operated by using reflected light reflected from two different areas of the reflector. Since it enables servo control corresponding to the formula and rotation key operation for each mode, it does not use the mechanical dial contact method to prevent the spark noise that occurred during the operation of the jog / shuttle key and the error caused by the contact anxiety during long time use. It can be effective.

Description

Jog / shuttle speed controller

1 is a block diagram of a jog / shuttle device according to the prior art.

2 is a waveform diagram of each part in the jog mode.

Figure 3 (a) is a waveform diagram of each part in the conventional shuttle forward mode.

(b) is a waveform diagram of each part in the conventional shuttle reverse mode.

4 is a block diagram of a jog / shuttle device according to the present invention.

5 is a circuit diagram of a jog / shuttle device according to the present invention.

6 is a waveform diagram of each part in the jog / shuttle mode of the present invention.

7 is a flowchart in jog mode of the present invention.

8 is a flowchart in a shuttle mode according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: signal generator 11: light emitting unit

12 reflector 13: first light receiving unit

14: second light receiving unit 20: buffer unit

30: signal processor 40: buzzer circuit

R ₁ to R ₈ : Resistor C ₁ to C ₃ : Capacitor

The present invention relates to a speed control device of a jog / shuttle device of a VCR, and more particularly, to a speed control device of a jog / shuttle device that generates a servo control signal necessary for jog / shuttle mode using a reflector.

The conventional jog shuttle / device includes a mechanical contact signal generator 1, a signal processor 2 for receiving an output signal of the mechanical contact signal generator 1, and the signal processor 2 as shown in FIG. Servo system 3 that receives the output signal of), a drum motor (4) and a capstan motor (5) for driving under the control of the servo system (3).

In the conventional jog / shuttle device configured as described above, when the user selects a desired mode using the mechanical contact signal generator 1, the waveforms of FIGS. 2 and 3 (a) to (b) are different for each mode. Is output. The signal processor 2 receiving the output waveform outputs a signal to the servo system 3, and the servo system 3 drives the drum motor 4 and the capstan motor 5 according to each mode.

2 is an output waveform diagram of each part in jog mode. If the 'high' part is narrower than the 'low' part within a certain period, it is forward. In addition, the wider the cycle, the slower the speed, the narrower the speed.

The jog mode allows the user to set the playback speed and direction of the screen arbitrarily, while the shuttle mode can play only according to the set direction and speed. FIG. 3 (a) is a waveform diagram of each part output by speed in the forward direction of the set shuttle mode, and FIG. 3 (b) is a waveform diagram of each part output by speed in the reverse direction of the set shuttle mode.

Since the jog / shuttle device is a signal generating device using a mechanical dial contact method, there is a problem in that noise may be generated due to friction of the mechanical contact during continuous use for a long time, and a malfunction may occur due to wear in the process of interrupting the contact.

Accordingly, the present invention has been made to solve the above-described problems of the prior art, and by attaching a reflector having a different light reflectance at each part of the reflecting surface to the jog / shuttle key, It is an object of the present invention to provide a speed control device of a jog / shuttle device that can solve a spark noise generated by a mechanical contact and anxiety of a contact when used for a long time by generating a reproduction speed control signal.

The speed control device of the jog / shuttle device of the present invention for achieving the above object, in the jog / shuttle device of the video signal player, the light emitting unit for converting an electrical signal into an optical signal, interlocked with the jog or shuttle key rotation Reflectors having different reflectances according to respective portions of the reflecting surfaces rotated and spaced apart from each other, a first light receiving unit configured to receive light reflected from the first region of the reflector and convert the light into an electrical signal; The second light receiving unit receives light reflected from the second region different from the first region and converts the light into an electrical signal, and separates the jog or shuttle mode according to the output of the first and second light receiving units. And a signal processor for outputting a servo control signal corresponding to the rotation.

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

As shown in FIGS. 4 and 5, the jog / shuttle device according to the present invention includes a signal generator 10 for generating a reproduction speed signal for each jog / shuttle mode, and an output signal of the signal generator 10. Receives a jog or shuttle mode by receiving a buffer unit 20 for outputting a signal having a constant output value, the output signal of the buffer unit 20 and the output signal of the signal generator 10 is divided into jog or shuttle mode A signal processor 30 for outputting a servo control signal corresponding to the rotation of the shuttle key, a buzzer circuit 40 for receiving the output signal of the signal processor 30, and an output signal of the signal processor 30. It consists of the receiving servo system 3, the drum motor 4, and the capstan motor 5 which are driven by the control of the said servo system 3.

The signal generator 10 has a light reflector 11 for converting an electrical signal into an optical signal, and has a different reflectance according to each part of the reflective surface which is interlocked and divided at regular intervals according to rotation of the jog or shuttle key. A reflector 12, a first light receiver 13 for receiving light reflected from a first region (inner portion of the drawing) of the reflector 12 and converting the light into an electrical signal, and a first of the reflector 12. The second light receiving unit 14 receives light reflected from a second area different from the area (outer part of the drawing) and converts the light into an electrical signal.

The light emitting unit 11 is configured by connecting a power supply (Vcc), a first resistor (R ₁ ) and a light emitting diode in series, the reflector 12 is formed of a double to distinguish the jog mode and the shuttle mode, A plurality of reflecting surfaces having different reflectances are formed, and the reflectances of the reflecting surfaces sequentially increase in a predetermined direction and decrease sequentially in a different direction relative to the neutral position.

The first light receiving part 13 includes a first photo transistor PT ₁ having a second output R ₂ connected to a power supply Vcc and one terminal connected thereto, and a collector output terminal connected to another terminal of the second resistor R ₂ . ), And one terminal is connected to the emitter output terminal of the _first phototransistor PT ₁ and the other terminal is connected in parallel with the grounded third resistor R ₃ and the third resistor R ₃ . It consists of a first capacitor C ₁ .

The second light receiver 14 includes a fourth resistor R ₄ connected to a power supply Vcc and one terminal thereof, and a second photo transistor PT ₂ having a collector output terminal connected to another terminal of the fourth resistor R ₄ . ), And one terminal is connected to the emitter output terminal of the second photo transistor PT ₂ , and the other terminal is connected in parallel with the grounded fifth resistor R ₅ and the fifth resistor R ₅ . One terminal is connected to the second capacitor C ₂ and the emitter output terminal of the second photo transistor PT ₂ , and the other terminal is composed of a sixth resistor R ₆ connected to the signal processor 30. do.

The buffer unit 20 is the first light-receiving unit 13 and the one terminal is connected to a seventh resistor (R ₇₎ and, the other terminal of the seventh resistor (R ₇₎ is connected to the base output terminal collector output terminal wherein A transistor TR connected to the signal processor 30, one terminal connected to a power supply Vcc, and the other terminal connected to an eighth resistor R ₈ connected to a collector output terminal of the transistor TR, and the transistor ( And a third capacitor C ₃ connected between the collector output terminal and the emitter output terminal of TR).

Rotating the inside of the reflector 12 operates in jog mode, and the light output from the light emitting unit 11 is projected onto a part of the reflector 12 and reflected according to the reflectance of the reflecting surface, and the reflected light is It is input to the 1st light receiving part 13. Then, the first light receiving unit 13 is converted into an electrical signal, and the VCR operates in a mode corresponding to the signal.

In the first light receiving unit 13, the first photo transistor PT ₁ outputs an emitter voltage in proportion to the amount of light input.

At this time, when the reflectance of the reflector 12 is rotated toward the greater side, the base current flowing through the _first phototransistor PT ₁ gradually increases, thereby increasing the potential at the point ⓐ, and when the reflector of the reflector decreases to decrease. The base current flowing through the first photo transistor PT ₁ gradually decreases, and thus the potential at the point ⓐ decreases. The operation of the signal processing section 30 in the jog mode stores the potential at the point ⓐ after converting it into a digital value as shown in the flowchart of FIG. If the digital conversion value which is continuously input exceeds the reference value, it is recognized as the forward jog mode and when the digital conversion value decreases, the signal is output to the servo system 3. The servo system 3 outputs a control signal to drive the drum motor 4 and the capstan motor 5. Here, the reference value may be regarded as the digital conversion value when the reflector 12 is in the neutral position.

Meanwhile, the signal output from the first light receiver 13 conducts the transistor TR through the seventh resistor R ₇ . When the transistor TR becomes conductive, current flows through the eighth resistor R ₈ , and the potential at the point ⓒ of the signal processor 30 is low.

However, if no signal is output from the first light receiving portion 13, the transistor TR is cut off and no current flows, and the potential at point ⓒ becomes high. When the potential of point ⓒ becomes high, it recognizes the jog mode and outputs a signal with a period corresponding to the potential value according to the amount of reflection. Therefore, the signal processor 30 controls the traveling speed of the drum motor 4 and the capstan motor 5 by outputting a control signal according to the applied signal.

The jog mode allows the user to set the playback speed and direction of the screen randomly, while the shuttle mode can play only according to the set direction and speed. When the outside of the reflector 12 is rotated, the light output from the light emitting unit 11 is converted into an electrical signal from the second light receiving unit 14 and the VCR operates in the shuttle mode. The reflecting surface of the reflector 12 reflects light of different intensity to the second light receiving portion 14 according to the reflectance.

When there is light input to the second light receiving unit 14, the second photo transistor PT ₂ is 'on'. When the second photo transistor PT ₂ is 'on', current flows through the fourth resistor R ₄ , the fifth resistor R ₅ , the second capacitor C ₂ , and the sixth resistor R ₆ . When the potential at the point ⓓ is applied to the signal processor 30 and the second photo transistor PT ₂ is 'off', no current flows and the potential at the point ⓓ applied to the signal processor 30 is Goes low. Here, when the potential at the ⓓ point is high, the signal processor 30 recognizes the shuttle mode, and the continuous potential value of the second photo transistor PT ₂ is divided into sections to determine the servo system 3 and the drum motor at a predetermined regeneration speed. (4) and the capstan motor 5 are driven.

The operation of the signal processor 30 in the shuttle mode is as shown in the flowchart of FIG. 8. The signal processing unit 30 reads the potential of the ⓓ point, converts it into a digital value, and compares it with the set reference value and outputs it to the servo system 3 for each mode. The servo system 3 outputs a control signal to drive the drum motor 4 and the capstan motor 5. However, if the input value is out of the range of the set reference value, the signal processor 30 drives the buzzer circuit 40.

Mode reference voltages set in the signal processor 30 are shown in the table below.

For example, if the voltage applied at the current point ⓓ is 3.5V, for example, the reference value 3.5V is the forward slow mode, the shuttle operates in the forward slow mode and the voltage applied at the point ⓓ is 2.0V. If the reference value is 2.0V in reverse slow mode, the shuttle operates in reverse slow mode.

A waveform diagram of each point (ⓐ, ⓒ, ⓓ) for each jog / shuttle mode having the above operation is shown in FIG. The jog mode is a continuous waveform, and the shuttle mode is a constant waveform determined for each mode.

As such, the speed control device of the jog / shuttle device according to the present invention enables the recognition of the jog / shuttle mode and the servo control corresponding to the rotation key operation for each mode by using the reflected light reflected from two different areas of the reflector. Since the mechanical dial contact method is not used, it is possible to prevent the spark noise generated during the operation of the conventional jog / shuttle key and an error due to the contact anxiety when used for a long time.

Claims (1)

In the jog / shuttle device of a video signal player, A light emitting unit for converting an electrical signal into an optical signal; A reflector having a different reflectance according to each part of the reflecting surface which is interlocked according to the jog or shuttle key rotation and divided at regular intervals, A first light receiving unit configured to receive light reflected from the first region of the reflector and convert the light into an electrical signal; and convert the light reflected from a second region different from the first region of the reflector to convert and output the light into an electrical signal. 2 light-receiving unit, Speed of jog / shuttle device characterized in that it comprises a signal processing unit for outputting a servo control signal corresponding to the rotation of the jog or shuttle key by distinguishing the jog or shuttle mode according to the output of the first, second light receiving unit Control unit.