• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method of controlling the tape detection of V-C. The present invention relates to a play mode determination process for determining whether a current mode is a play mode, and a residual amount detection determination process for detecting a remaining amount of tape when it is determined that the play mode is in the play mode determination process. If the remaining amount of the tape is determined to be less than the reference value in the remaining amount detection judgment process, a current is supplied to the photodiode of the tape presence / absence detection device, and otherwise, a control process is performed to cut off the current. This improves the lifespan of the light emitting device and reduces the functional error rate of V-Cal.
    公开号:KR19990030987A
    申请号:KR1019970051501
    申请日:1997-10-08
    公开日:1999-05-06
    发明作者:김재학
    申请人:전주범；대우전자 주식회사；
    IPC主号:
    专利说明:

    V-seal tape detection control method
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling the tape detection of a V-Cal. In particular, when detecting the play remaining amount below the reference value from the tape remaining-detection device attached to the V-Cal, the photodiode of the tape presence detecting device is always started. The present invention relates to a tape detection method of V-CAL which extends the life of the photodiode by controlling the lighting of the photodiode turned on.
    In general, the presence or absence of a tape and the remaining amount detection of V-Cal are detected using a photodiode to detect the presence or absence of the tape, and the remaining amount of the tape being played according to the rotation ratio of the winding reel rotating plate and the supply reel rotating plate.
    Then, look at the detection of the presence of the tape V such as above.
    1 is a view showing a tape presence detection device using an optical sensor, and a prism 71 for emitting light to a specific position to detect the presence or absence of the tape 70, and is installed on the lower end of the prism 71 A light emitting element 72 for emitting light by an electrical signal, and a first receiving sensor 73 and a second receiving sensor 74 for receiving light emitted from the light emitting element 72 at a predetermined position.
    FIG. 2 is a circuit diagram illustrating the apparatus, including a photodiode D for radiating light to detect a tape, and a first photo transistor for detecting light emitted from the photodiode D at both ends of the tape. A microcomputer for controlling the mode of V-Cal by connecting to the emitter terminals of the Q1) and the second photo transistor Q2 and the first photo transistor Q1 and the second photo transistor Q2 to determine the presence or absence of a detection signal. And a deck unit 71 connected to the output port of the microcomputer 70 and performing a hardware function by the control signal.
    In addition, each of the resistors R and R to protect the respective elements and limit the current at the anode end of the photodiode D, and the collector end of the first phototransistor Q1 and the second phototransistor Q2. R1 and R2 are connected, and one end of the resistors R, R1 and R2 is connected to a power supply voltage Vcc.
    The following describes the operation of such a configuration.
    First of all, the tape drawn and driven by V-Cal is introduced between the photodiode (D) and the second phototransistor (Q2) through the first photo transistor (Q1) and the photodiode (D). Only in mode or fast forward mode.
    The power supplied from the power supply voltage Vcc flows into the photodiode D through the resistor R to emit light having a predetermined brightness. From this, the first phototransistor Q1 and the second photoport are emitted. Transistor Q2 can receive this. This is because the light through the light emitting element 72 through the prism 71, the first receiving sensor 73 and the second receiving sensor 74 is located behind the tape 70 as the tape 70 is transferred. To diverge.
    Here, when the first phototransistor Q1 receives light from the advancing direction of the tape and a low signal is output to the emitter terminal of the second phototransistor Q2, this indicates that the tape is completed. As the 70 passes through the front part of the first receiving sensor 73, as the end of the recordable portion of the tape 70, that is, the end of the not shown magnet portion passes, the magnet tape is fed to the cassette. The light emitted from the light emitting device 72 is introduced into the first receiving sensor 73 by the vinyl of the transparent material connected to the fastening roll.
    Therefore, the microcomputer 75 transmits a control signal for mode switching, that is, switching to the stop mode, to the deck unit 76 to inform that the current tape 70 is all supplied to the reel.
    On the other hand, when the second photo transistor Q2 receives the light and a low signal is output to the emitter terminal of the first photo transistor Q1 according to the user's function mode selection, the microcomputer 75 rewinds the current mode. It is determined that the mode is to transmit the stop signal to the deck unit 76.
    The light reception of the first phototransistor Q1 and the second phototransistor Q2 is not performed by the tape, and thus the V-CAL function of the microcomputer 75 is not performed. In addition, neither of the first phototransistor Q1 nor the second phototransistor Q2 receives light because the tape exists on both sides.
    On the other hand, in the driving state of such a system, by continuously supplying a current to the light emitting device for detecting the presence or absence of the tape to continuously detect the presence or absence of the tape, the portion to be detected is substantially both ends of the tape. Therefore, the light emitting device is placed in a continuous light emission state and reaches the end of the tape to detect the presence of the tape while the tape is running for a long time, thereby shortening the lifespan of the light emitting device and eventually increasing the error rate of the V-CAL. There is a problem.
    The present invention has been made to solve such a problem, by measuring the progress of the current tape using the remaining tape detection circuit is already mounted on the V-al and controls the flashing of the photodiode for detecting the presence or absence of the tape Accordingly, an object of the present invention is to provide a VSA tape detection control method which eliminates unnecessary lighting time of the photodiode and improves the life of the device.
    In order to achieve the above object, the present invention provides a play mode determination process for determining whether a tape inserted into a VCA is a play mode, and a remaining amount of tape if it is determined that the play mode is determined to be a current play mode. When the remaining amount detection judgment process and the amount of the tape being played are judged to be lower than the reference value, the current is supplied to the photodiode of the tape presence / absence detection device and the current is cut off. It is characterized by consisting of a process.
    1 is a view showing a tape presence detection circuit of conventional V-Cal;
    2 is a view showing a tape presence detection device of conventional V-Cal;
    3 is a view showing the remaining tape detection apparatus applied to the present invention,
    4 is a diagram showing a tape detection circuit of V-Cal applied to the present invention.
    5 is a flowchart of the present invention.
    <Explanation of symbols for main parts of drawing>
    1 tape 2 winding reel fastening roll
    3: feed reel fastening roll 4: cassette
    5: capstan motor 6: winding reel joint
    7: winding reel rotating plate 8: second detecting device
    9: supply reel fastening part 10: supply reel rotating plate
    11: first detection device 12: tape presence detection unit
    13: remaining tape detection unit 14: microcomputer
    15: deck portion 16: key input portion
    R1-R7: Resistor PT1-PT4: Phototransistor
    PD1-PD3: Photodiode Q: Transistor
    A, B, D, E: Micom signal input terminal C: Micom signal output terminal
    Such a present invention will be described in detail based on the accompanying drawings.
    First, FIG. 3 is a diagram illustrating an apparatus for detecting a residual amount of tape. The component includes a tape 1 on which video signals, audio signals, and control signals are recorded, and the tape 1 is wound in one direction. The winding reel fastening roll 2, the supply reel fastening roll 3 which supplies this tape from the other side by the tape 1 wound by rotation to this winding reel fastening roll 2, and the said tape 1 A cassette 4 for protecting against incident light and constituting a predetermined size and a predetermined position of the tape, and when the cassette 4 is introduced into V-Cal, a capstan motor 5 for generating a driving force for winding the cassette tape; ;
    The winding reel fastening part 6 which rotates the said winding reel fastening roll 2 by receiving the driving force of this capstan motor 5, and this winding reel fastening part 6 rotates in phase, when this Winding reel rotary plate (7) having a predetermined length of stripes to measure the number of revolutions along the rotation, and the supply reel having a rotational force received by receiving the rotational force from the winding reel fastening portion 6 from the tape (1) It consists of a fastening part 9 and a supply reel rotating plate 10 which has a predetermined length of stripes formed so as to rotate in phase with the supply reel fastening part 9 and measure the number of rotations in accordance with this rotation.
    And when the winding reel rotating plate (7) rotates the first detecting device 11 is provided to detect the light reflected from the stripe and output a predetermined waveform according to the rotation, and the supply reel rotating plate (10) The second sensing device 8 is provided to detect the light reflected from the stripes when the rotation is performed and to output a predetermined waveform according to the rotation.
    The explanation of the operation by such a configuration is as follows.
    First, as the cassette 4 is introduced into VSI, the tape 1 is conveyed toward the head drum from a feed shaft composed of a guide roller and a slant pawl. To form a predetermined slope with the drum
    Then, the capstan motor 5 is driven, from which the tape 1 is transferred and at the same time, the winding reel fastening part 6 rotates at a predetermined rate through a gear not shown.
    Therefore, the tape 1 is wound from the feed reel fastening roll 3 to the reel reel fastening roll 2 at a uniform speed by the control speed of the capstan motor 5. And from this, the winding reel rotating plate 7 attached to the lower end of the winding reel fastening part 6 and the supply reel rotating plate 10 attached to the lower end of the supply reel fastening part 9 rotate.
    Then, the rotation speed, that is, the mutual rotation rate, can be measured from the stripes drawn on the winding reel rotating plate 7 and the supply reel rotating plate 10. This uses the presence or absence of light reflection from the stripes through the first sensing device 11 and the second sensing device 8 including the light emitting part and the light receiving part. That is, the supply reel fastening roll 3 and the reel fastening roll 2 by comparing the number of times of light reflected per unit time from the winding reel rotating plate 7 and the number of times of light reflected per unit time from the feeding reel rotating plate 10. It calculates the ratio of the quantity of the tape 1 wound on the edge.
    For example, the result calculated through the above process determines that the amount of the tape 1 wound on the take-up reel fastening roll 13 and the amount of the tape 1 wound on the supply reel fastening roll 3 are determined to be equal to or less than a predetermined ratio. If it is determined that the tape is almost wound, the current is supplied to the presence or absence of the tape detecting unit, which will be described later.
    Then, the tape presence detection unit judges that the tape 1 is completely wound and switches to a predetermined control mode.
    Meanwhile, a circuit diagram of the present invention including the tape detection unit will be described in detail with reference to FIG. 4 as follows.
    First of all, the configuration of the apparatus includes a tape presence detection unit 12 mounted at the top of the BC-Deck to detect the end of the tape by light transmission, and a residual amount of tape mounted at the bottom of the BC-Deck. NPN (NPN) for determining whether to cut off the current supplied to the tape presence detection unit 12 in the middle of the remaining tape detection unit 13, the tape remaining detection unit 13 and the tape presence detection unit 12 ) Transistor Q, a microcomputer 14 for overall control of the system by receiving a signal output by the function, and a deck unit connected to an output terminal of the microcomputer 14 to perform a hardware function ( 15) and a key input section 16 which allows the user to select a function mode of V-Cal.
    The tape presence detection unit 12 receives the photodiode PD1 having a light emitting function and the light emitted from the photodiode PD1 to perform a switching function. PT2 and resistors R1, R2, and R3 connected to the signal input terminal of each element to limit the current flowing to each element.
    The tape remaining amount detection unit 13 further includes a first sensing device 11 and a second sensing device 8 made of a photo coupler, and elements of the first sensing device 11 and the second sensing device 8. Resistor (R4, R5, R6, R7) for protecting the device by limiting the current to be applied to the photo coupler is a second photodiode (PD2) and third photodiode (PD3) for emitting light And a third phototransistor PT3 and a fourth phototransistor PT4 for receiving light.
    The signals output from the respective photo transistors PT1-PT4 are represented by the signal input terminals A, B, D, and E of the microcomputer 14.
    On the other hand, the operation by such a configuration is described as follows.
    First, when a key for selecting a play function is input to the key input unit 16, a high signal is applied to the base side of the transistor Q to cause the first photodiode PD1 to emit light. The output signal is applied from the first phototransistor PT1 and the second phototransistor PT2. When the input signal of the first phototransistor PT1 and the second phototransistor PT2 is determined to be high, the microcomputer ( 14) turns off the transistor (Q) and outputs a control signal to the deck unit 15 to start the normal driving of V-Cal.
    At the same time as the normal driving of the VR, the third photodiode PD2 of the first sensing device 11 and the third photodiode PD3 of the second sensing device 8 are supplied with a current. A pulse waveform signal is applied to the microcomputer 14 to the photo transistor PT3 and the fourth photo transistor PT4. The pulse waveform is formed by the streaks of the feeding reel rotating plate and the winding reel rotating plate described above, and the microcomputer 14 receives a signal input at this time, that is, a pulse per unit time applied to the D and E input terminals of the microcomputer 14. It measures the number and compares the rotation speed of feed reel and take-up reel.
    Then, the microcomputer 14 can detect the remaining amount of the tape wound on the supply reel from the rotational speed. If the detected remaining amount is determined to be below a predetermined reference value, the microcomputer 14 turns on the transistor Q to turn on the first port. The diode PD1 emits light. Therefore, the first phototransistor PT1 and the second phototransistor PT2 detect whether light is received and transmit the same to the microcomputer 14.
    At this time, when the high signal is applied to the microcomputer 14 from the first photo transistor PT1, that is, when the tape wound on the supply reel is transferred to the winding reel, the microcomputer 14 sends VLC to the deck unit 15. It is to apply a control signal to stop.
    On the other hand, when the user selects a function such as fast sensing or rewinding through the key input unit 16, the microcomputer 14 sets the signal of the base input terminal C of the transistor Q to be always high to thereby make the first photodiode. As PD1 emits light, it is possible to quickly detect the presence or absence of a tape of VSI.
    This operation will be described below based on the flowchart illustrated in FIG. 5.
    First, power is supplied to the VCA and a tape is inserted from the user. The initialization state S1 is performed to proceed to the C terminal high output step S2 to detect tape presence. Then, the process proceeds to the A and B low level determination step S3 of determining whether the signals input to A and B are low signals. If the determined result is that the signals input to A and B are both low signals, If it is detected that the tape is present, the process proceeds to the play mode determination step (S5) of determining whether the current VRC mode is the play mode.
    If it is determined in the play mode determination step (S5) that it is determined that the play mode, the process proceeds to the remaining amount detection step (S6) of detecting the remaining amount of the tape of the supply reel and the take-up reel. As the remaining amount of tape detection of the supply reel is detected in the remaining amount detecting step (S6), the process proceeds to the determination step S8 or less that determines whether the detected remaining amount is equal to or less than the predetermined reference value.
    Therefore, as a result of judging at or below the reference value (S8), if the amount of the tape remaining in the supply reel is less than the reference value, the output signal of the C terminal is set to high, and the C terminal high output for detecting the presence or absence of the tape. The process proceeds to step S10.
    Then, the C terminal detects that the tape wound on the supply reel is supplied to the reel through the high output step S10, so that the V-CAL can be switched to the stop mode.
    On the other hand, as a result of the tape detection determination step (S3), it is determined that the signals input to A, B are not all low, that is, if it is determined that the tape is all sent to either of the supply reel and the reel. According to the determined state to proceed to a separate function performing step (S4) to perform a separate function, as determined in the play mode determination step (S5), it is determined that the current VR mode is not the play mode, that is, quickly If it is determined as the winding mode or the rewinding mode, the process proceeds to the input mode performing step (S9) that performs a function according to the mode input from the user, and then proceeds to the C terminal high output step (S10) to continue the tape presence detection function. To do it.
    In addition, if it is determined that the amount of the tape remaining in the supply reel does not remain below the reference value determined in the determination step (S8) below the reference value to proceed to the C terminal low output step (S7) to block the presence or absence of the tape detection function. .
    As described above, in the present invention, if it is determined whether the tape inserted into the VCA is in the play mode, and the current state is determined to be in the play mode, the present invention detects the remaining amount of the tape and determines whether the amount of the tape is equal to or less than the reference value. By controlling the timing, not only unnecessary power consumption is prevented by turning on / off the photodiode that is always emitting light in the same way that the power of the V-Cal is turned on / off, but also reduces the error rate of the V-Cal by extending the life of the device. It is effective to make.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] Tape reel detection process for detecting the presence or absence of a tape when the tape is inserted into the VCD deck, and a supply reel for determining the amount of the wound on the supply reel and the winding reel of the tape cassette inserted into the VCA through the tape inlet detection process; If it is determined in the winding reel tape amount determination process and the supply reel and the winding reel tape amount determination process that the amount of the tape wound on the supply reel and the winding reel is wound over a certain amount, it is determined whether the current mode is the playback mode. In the process of judging the regeneration mode to judge, and if it is determined that the current mode is set to the regeneration mode as a result of judging in the regeneration mode, the remaining amount detection process of detecting the amount of tape remaining in the supply reel Judgment below the threshold value to judge whether the detected quantity of tape is below the threshold value If it is determined that the amount of tape remaining in the supply reel is less than or equal to the reference value, the tape detection power supply process supplies power to the tape presence detection unit to perform the detection of the presence or absence of the tape, and the result remains in the supply reel as determined in the determination below the reference value. If the amount of the tape is determined to be greater than the reference value tape detection control method characterized in that the tape detection power off step of shutting off the power of the tape presence detection unit.
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    同族专利:
    公开号 | 公开日
    KR100262859B1|2000-08-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-10-08|Application filed by 전주범, 대우전자 주식회사
    1997-10-08|Priority to KR1019970051501A
    1999-05-06|Publication of KR19990030987A
    2000-08-01|Application granted
    2000-08-01|Publication of KR100262859B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970051501A|KR100262859B1|1997-10-08|1997-10-08|A tape detection controlling method of vcr|
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