• 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:
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decelerating a speed of a capstan motor at the time of entering a stop mode of a video cassette recorder driven in a high speed running mode or a high speed rewinding mode, The speed is decelerated in steps of 10 steps. When the rotation speed of the capstan motor reaches the predetermined speed, the deceleration is temporarily stopped. When the stop key signal or the end / start detection signal is applied, the video cassette recorder is switched to the stop mode Process. That is, according to the present invention, when the video cassette recorder performing the high-speed running or the fast-rewinding mode enters the stop mode, the conventional abrupt capstan motor deceleration method is eliminated and the deceleration step is divided for each set step, .
    公开号:KR19990056459A
    申请号:KR1019970076454
    申请日:1997-12-29
    公开日:1999-07-15
    发明作者:유보민
    申请人:전주범；대우전자 주식회사；
    IPC主号:
    专利说明:

    How to control the capstan motor when the video cassette recorder enters stop mode
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (VCS), and more particularly, to a video cassette recorder (VCS) (capstan motor) rotation speed deceleration method.
    V-SIGNAL is a device that magnetizes a video tape as a magnetic body by using a magnetic head mounted on a rotating head drum, thereby recording video and audio signals on a video tape, or reading and outputting video and audio signals recorded on a video tape to be.
    Such a V-shaped ball is provided with a reel motor and a capstan motor for driving the videotape. In addition, a V-shaped ball is usually equipped with a microcomputer to control the rotation of each of the motors. That is, in the playback mode, each motor is rotated at a playback speed so as to accurately reproduce and output a signal at the time of recording. In the high-speed running mode or the high-speed rewinding mode, a speed much faster than that in the playback mode (SP mode) To rotate the motor.
    At this time, when the V-Sail is in the state for entering the stop mode while driving the V-Sail in the high-speed running mode or the fast-rewind mode (in this stop mode, the reel area of the videotape is calculated, The microcomputer in the V-SERIAL outputs a brake signal for temporarily stopping each of the motors, and when the predetermined time has elapsed, the motor is rotated at a speed several times slower than that at the time of high-speed driving.
    When such a stop signal is generated, since a considerable tension is temporarily generated in the video tape, there arises a problem that a physical defect of the video tape occurs.
    SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide such a method.
    That is, the present invention provides a capstan motor control method for a VCSEL in which a preset number of deceleration data stored in a high speed running or a high speed rewinding mode is stored, the method comprising: Setting a deceleration mode; When the deceleration mode is set, detecting the rotation speed of the capstan motor and sequentially decelerating the rotation speed of the capstan motor in units of steps every time the rotation speed of the capstan motor corresponds to the deceleration data per section; Determining whether the rotation speed of the detected capstan motor reaches a predetermined speed, and releasing the deceleration mode when a predetermined speed is reached; Determining whether the high-speed running mode or the high-speed rewinding mode is canceled after releasing the deceleration mode, and switching the V-Series to the stop mode when the high-speed running or the fast rewinding mode is released Provides a capstan motor control method at entry.
    1 is a block diagram of a video cassette recorder for carrying out a method according to the invention,
    FIG. 2 is a flowchart of a process of decelerating a rotation speed of a capstan motor when entering a stop mode according to the present invention. FIG.
    Description of the Related Art
    10: key input unit 20: end / start sensor
    30: Microcomputer 40: Capstan motor drive unit
    50: Capstan motor 60:
    70: CFG generator 80: speed detector
    90:
    The above objects and various advantages of the present invention will be described in detail with reference to the accompanying drawings.
    FIG. 1 is a schematic block diagram of a VCSEL for performing the method according to the present invention. The VCSEL includes a key input unit 10, an end / start sensor 20, a microcomputer 30, a capstan motor driving unit 40, A remaining amount detecting unit 60, a CFG (Capstan Fulse Generator) generating unit 70, a speed detecting unit 80, and a memory unit 90.
    As shown in the figure, the key input unit 10 includes a plurality of function keys (not shown) for controlling the operation of the VSS, such as a power on / off key, And apply a key signal to the microcomputer 30. [
    The end / start sensor 20 is located at a predetermined position in a deck (not shown), and detects the end of the video tape by detecting a transparent portion formed at the end of the video tape. That is, the end / start sensor 20 is composed of a light emitting device, for example, and is configured to apply a logic signal according to an input signal to the microcomputer 30 when an optical signal is inputted through a transparent portion of the video tape.
    The remaining amount detecting unit 60 calculates the reel rotation speed and reel area of the video tape inserted in the V-shaped seal, and provides the calculated remaining amount time data to the microcomputer 30. Those skilled in the art will readily appreciate that the residual amount detection process is not described in detail.
    The capstan motor driving unit 40 drives the capstan motor 50 by a predetermined driving current and the capstan motor 50 performs the rotating motion by driving the capstan motor driving unit 40. [ At this time, the capstan motor 50 is provided with the CFG generating unit 70 according to the present embodiment, and the CFG generating unit 70 generates CFG pulses corresponding to one rotation of the capstan motor 50. That is, as the capstan motor 50 rotates once, a predetermined frequency is generated.
    The speed detecting unit 80 detects a CFG pulse period according to the rotation of the capstan motor generated from the CFG generating unit 70 and provides the capstan motor speed value corresponding to the CFG pulse period to the microcomputer 30. [
    The microcomputer 30 according to the present invention selectively drives V seals in response to a predetermined key signal from the key input unit 10 described above. That is, the microcomputer 30 drives the V-seal in a high-speed running or high-speed rewinding mode and sets the deceleration mode according to the present embodiment in accordance with the remaining amount data from the remaining amount detecting unit 60. [ The microcomputer 30 also selectively drives the capstan motor 50 by comparing the speed data detected from the speed detector 80 with the predetermined number of deceleration data. That is, the microcomputer 30 is provided with the memory unit 90. When the deceleration mode is set, the microcomputer 30 reads the deceleration data (progress speed per one rotation of the capstan motor) from the memory unit 90 for reference .
    Hereinafter, the process of decelerating the rotational speed of the capstan motor 50 in the stop mode according to the present invention will be described in detail with reference to the flowchart of FIG. 2, together with the above-described configuration.
    First, in step S100, the microcomputer 30 determines whether the current VSS is in a high-speed traveling mode or a high-speed reverse mode. That is, it is determined whether a high-speed traveling key signal or a high-speed rewinding key signal is applied from the key input unit 10.
    If it is determined in step S100 that the vehicle is in the high-speed traveling mode or the high-speed rewinding mode, the microcomputer 30 proceeds to step S102 to drive the vehicle in the high-speed traveling mode or the high-speed rewinding mode. At this time, the microcomputer 30 detects the remaining amount of the running video tape from the remaining amount detecting unit 60 (S104), and proceeds to step S106.
    In step S106, the microcomputer 30 determines whether or not the deceleration time is performed. That is, it is determined whether the remaining amount detected from the remaining amount detecting unit 60 is a predetermined remaining amount for performing deceleration.
    As a result of the determination in step S106, if the deceleration time is reached, the microcomputer 30 proceeds to step S108 to perform the deceleration mode according to the present embodiment.
    The deceleration mode performing step S108 will be described in detail with reference to a look-up table stored in the memory unit 90. [ Prior to the description, each value on the look-up table can be changed somewhat according to experimental conditions, and this fact will be readily apparent to those skilled in the art.
    * Lookup - Table *
    CFG dispense ratioActual CFG period (μs)Actual reduction ratio (㎲) One2645.521322.75264.55 / 2 .................. 25105.8221.168 / 2 26101.7520.35 / 2 2797.9819.604 / 2
    As described above, when the deceleration mode is set, the microcomputer 30 detects the rotation speed of the current capstan motor 50 from the speed detection unit 80 and the rotation speed of the capstan motor 50 is stored in the memory unit 90 The capstan motor 50 is controlled so that the initial deceleration data among the section deceleration data, that is, the CFG cycle represented by the first and second columns of the look-up table corresponds to the CFG cycle of 97.98 microseconds, which is 27 times the speed. That is, in order to make the current capstan rotation speed correspond to the initial deceleration data, the microcomputer 30 multiplies the actual reduction ratio (19.604 / 2 占 퐏) indicated in the third column of the look-up table by the predetermined number of step units and decelerates . That is, in the deceleration method according to the present embodiment, the CFG frequency division waveform generated by one rotation of the capstan motor 50 is set in 10 steps, and the deceleration data of the capstan motor is changed in units of 10 steps.
    These 10 CFG frequency dividing steps are utilized as appropriate data for this deceleration method. That is, as a result of experiments conducted by the applicant of the present invention, it is possible to perform a more precise deceleration method if the number of steps is 10 or more, but it is indicated that the deceleration time is required to be increased accordingly. If the number of steps is 10 or less, It was confirmed that there was difficulty in carrying out the appropriate deceleration method.
    On the other hand, when the 10 step change process of the initial deceleration data is completed, the rotational speed of the current capstan motor 50 is set to 10 times the deceleration reference (20.35 / 2 占 퐏) indicated in the third column of the look- The next deceleration data indicated in the first and second columns of the look-up table, that is, the CFG division ratio is changed to the CFG period of 101.75 占 퐏, which is 26 times the speed of the next deceleration reference (21.168 / 2 占 퐏) The process of changing to the next CFG division ratio of 25 times speed, that is, the CFG period of 105.82 占 퐏 is repeated by the 10 step setting.
    The microcomputer 30 proceeds to step S110 so that the rotation speed per rotation of the capstan motor 50 detected by the speed detection unit 80, that is, It is determined whether the actual CFG period has reached the preset CFG period (about 2645.5 μs according to the present experimental data). When the predetermined CFG period is reached, the above-described deceleration mode is released (S112) and the process proceeds to step S114.
    In step S114, the microcomputer 30 determines whether it is time to release the high-speed traveling mode or the high-speed rewinding mode. If the high-speed traveling mode or the high-speed rewinding mode is canceled, the microcomputer 30 switches the vehicle to the stop mode in step S116. The high-speed running mode or the fast rewinding mode can be released when a logic signal indicating that a stop key signal is applied from the key input unit 10 or an end is detected from the end and start sensors 20 is applied. Those skilled in the art will readily recognize the present invention.
    That is, the present invention is configured to break down the conventional rapid capstan motor deceleration method at the time of entering the stop mode of the VCSEL performing the high-speed running or the high-speed rewinding mode so as to subdivide the deceleration step by the set step.
    INDUSTRIAL APPLICABILITY As described above, the present invention has an effect of preventing the damage of the video tape during traveling in the stop mode of the vials performing the high-speed running or the fast rewinding mode.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] A method for controlling a capstan motor in a stop mode of a video cassette recorder in which a predetermined number of sections of deceleration data for driving in a high speed running or a fast rewinding mode are stored,
    Determining a stop mode entry point and setting a deceleration mode when the stop mode is entered;
    When the deceleration mode is set, the CFG waveform period generated by the capstan motor is detected, and the rotation speed of the capstan motor is sequentially decelerated in units of steps every time the CFG waveform period corresponds to the deceleration data per section ;
    Determining whether the detected rotation speed of the capstan motor reaches a preset speed and releasing the deceleration mode when the detected speed reaches the predetermined speed;
    Start detection signal is applied to the video cassette recorder after the deceleration mode is released, and when the stop key signal or the end / start detection signal is applied, the video cassette recorder is moved to the high- And switching from the rewind mode to the stop mode when the video cassette recorder is in the stop mode.
    [2" claim-type="Currently amended] The capstan motor control method according to claim 1, wherein the stop mode entering time judgment is possible by detecting a preset remaining amount of videotape in the video cassette recorder.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-12-29|Application filed by 전주범, 대우전자 주식회사
    1997-12-29|Priority to KR1019970076454A
    1999-07-15|Publication of KR19990056459A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970076454A|KR19990056459A|1997-12-29|1997-12-29|How to control the capstan motor when the video cassette recorder enters stop mode|
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