KR0154940B1 - Head precise position control method of vcr - Google Patents

Abstract

The present invention relates to a method for precisely controlling the head position of a V. C. egg, and setting the window to the input waveform, and integrating the waveform formed in the window as the window is set (S10, S20, S30) and If the integrated value is larger than the predetermined reference threshold value, shaping the waveform in the window (S40, S50, S60), and calculating the error distribution curve and then measuring the slope of the error distribution curve to detect the detected value. (S70, S80) and the position of the head by positioning the hole 33 of the drum 3 at the peak value of the measured slope, comparing the measured and detected slope measured in the steps S70, S80 with the slope of the predetermined reference distribution curve. It is configured to include a step (S90, S100) for precise control.

Therefore, by controlling the position of the head precisely through the photo sensor of the present invention, it is effective to more accurately measure the head height and relative distance of the V.C.

Description

V.C.R.head precision position control method

1 is a schematic diagram of a conventional V. C. head measuring device.

2 is a schematic diagram of an apparatus for implementing the method of head precision position control of V. C. eggs according to the present invention.

3 is a flow chart of the head precision position control method of the drum of V. C. R in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

1: Stage 2: Master

3: head drum 4: feed tray

5: objective lens 6: barrel

7: camera 8: monitor

9: motor 10: motor drive part

11 control unit 12 transfer tray control unit

13 fastening part 14 position detection sensor

The present invention relates to a device for measuring the height of the head of the video cassette recorder (hereinafter referred to as V.C.al) and the relative distance between the heads. In particular, it is possible to precisely perform position control using a photo sensor. It relates to a precision position control method of V.C.al head.

For a fixed head such as an audio tape recorder, rotating and recording and reproducing the cylinder body in which the head is mounted is called a rotating head. This rotating head was developed for V.C.AL.

Rotating heads take into account the tape speed and the economics of tape needed to record high-bandwidth video signals. A pair of heads installed at 180 ° intervals rotates at high speed 30 times per second. When recording a track pattern that appears to cross, the head of the other side has already started recording at the end of recording of one head.

Therefore, these heads are precisely spaced apart from each other by 180 ° during fabrication, and these heads should be manufactured to have the same height.

1 shows a schematic diagram of a conventional apparatus for checking the spacing and height between heads.

As shown, the conventional apparatus has a structure in which a master 2 is formed on the stage 1 and the head drum 3 is seated on these masters 2. At this time, the head drum (3) is left or right head (HL, HR) to the rear camera 7 by the objective lens (5) formed on the feed table (4) of the upper stage (1) as shown It is mounted on the master 2 so that the image can be picked up, and the transfer table 4 can move the objective lens 5 to the left and right by manual operation. Light signals of the head HL or HR in the head drum 3 projected onto the objective lens 5 are captured by the camera 7 through the barrel 6, and the camera 7 processes the captured signal to monitor the image. It is displayed in (8).

At this time, a predetermined reference line L1 is formed in the monitor 8 so that the user can see that the heads HL and HR of the head drum 3 are formed by the height difference between the line L1 and the head HL or HR. It is to check whether it is formed at the correct position, that is, the height. At this time, when the focus between the head drum 3 and the objective lens 5 is not in focus, the user moves the objective lens 5 by adjusting the feeder 4 to move the head drum 3 between the objective lens 5 and the objective lens 5. You can focus.

However, as mentioned above, in the conventional apparatus, the height and position of the head displayed on the monitor are visually monitored and measured. Therefore, in the case of a user, an error may occur due to a simple repetitive operation of measuring the height of the head, and there is a problem that a decrease in work efficiency and a decrease in accuracy may occur.

In order to solve this problem, the present inventor has proposed a head measuring device (application number No.) of V.C.R.

2 is a block diagram of the head measuring apparatus of the V. C. Al proposed by the present inventor, and as shown in the drawing, a stage (1), a master (2), a carriage (4), a camera (7), and a barrel ( 6) and the objective lens 5, the following apparatus is further comprised.

That is, the fastening part 13 is formed in the upper end of the head drum 3, The fastening part 13 is formed in the lower end of the rubber 14 or the like so that the head drum 3 can be fastened. The fastening part 13 is connected to the motor 9, and the motor 9 rotates under the control of the motor driving part 10. In this case, the motor driving part 10 is a rotation applied from the control part 11. The rotation of the motor 9 is controlled according to the signal.

On the other hand, the head drum 3 mounted on the upper part of the master 2 is composed of an upper head drum 31 and a lower head drum 32, the head (HL, HR) on the upper end of the upper head drum 31 The predetermined holes 33 and 34 are formed at the position where the is mounted.

The position detecting sensor 14 is positioned at an upper end of the upper head drum 31, and the position detecting sensor 14 detects holes 33 and 34 formed in the upper head drum 31 to detect a detection signal. Output

On the other hand, the feeder controller 12 is connected to the feeder 4, the feeder controller 12 transfers the feeder 4 to the left and right according to the focus state of the head imaged to the camera 7 It is configured to. The transfer control unit 12 may be configured using an image processor and a motor.

In addition, a control unit 11 is connected to the camera 7, and the control unit 11 is configured to process a signal captured by the camera 7 and apply the processed signal to the monitor 8. In addition, the controller 11 processes the signal applied from the camera 7 to specify the heights of the heads HL and HR with respect to the predetermined reference line and output the first display signal.

In addition, when the height measurement of one head HL or HR is finished, the controller 11 may rotate the next head HL or HR to the objective lens side until the detection signal is applied. The height of the next head HL or HR is measured by applying it to the motor driving unit 10, and the relative distances to the left and right heads HL and HR according to the output time of the rotation signal are measured, and this is measured as a second display signal. It is configured to output.

The monitor 8 is connected to the control unit 11, and the monitor 8 displays the signals applied from the control unit 11.

However, in order to accurately measure the height of the head of a V.C. egg in this device, the head in the drum must be accurately captured by the camera.

The present invention has been made in accordance with the above-described point, and an object of the present invention is to precisely control the head position of the V.C. drums through the image recognition. To provide a method.

According to a preferred embodiment for achieving the above object, the present invention provides a method for precisely controlling the position of the head of the V.C. Integrating a waveform formed in the window according to the setting of the window and integrating the waveform formed in the window with a predetermined reference threshold value. If the value is less than the threshold value, the drum is rotated by a predetermined amount and then returned to the window setting step; if the integrated value is greater than the threshold value, shaping the waveform in the window; Compares the normalized waveform with the reference waveform for a predetermined model base, obtains an error distribution curve, and then calculates the error distribution curve. Measuring and detecting the pressure, and comparing the detected and measured slopes with the slopes of a predetermined reference distribution curve and returning to rotating the drum a predetermined amount if the measured slope is less than the slope of the reference distribution curve. And otherwise precisely controlling the position of the head by positioning the hole of the drum at the peak value of the measured slope.

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

3 is a flowchart for implementing a method for precisely controlling the head position of a drum of a V.C.al drum in accordance with a preferred embodiment of the present invention.

In step S10, the waveform of the hole 33 of the head drum 3 is input to the monitor 8 via the position detecting sensor 14, that is, the photo sensor.

In operation S20, a window is set on the waveform input to the monitor 8 to form a specific portion, that is, a region of interest. Thereafter, in step S30, the integration is performed on the waveform in the window to calculate the value.

Thereafter, in step S40, the integral value calculated in step S30 is compared with a predetermined reference threshold value, and if the integral value calculated in step S30 is smaller than the reference threshold value, step S40 is performed. Proceeding to S50, and if greater than or equal to, proceeds to step S60.

Then, in step S50, the head drum 3 is rotated by a predetermined amount and then the process returns to step S20. On the other hand, in step S60, the waveform in the window is normalized. In step S70, the waveform normalized in step S60 is compared with a predetermined reference waveform based on the model base, and thus an error distribution curve, that is, an error distribution curve. In step S80, the slope of the error distribution curve detected in step S70 is calculated.

Thereafter, in step S90, the slope detected in step S80 is compared with the predetermined reference slope. If the detected slope in step S90 is smaller than the predetermined reference slope, the process returns to step S50, otherwise proceeds to step S100.

Finally, in step S100, by positioning the hole 33 of the head drum 3 at the peak value of the detected measurement slope, the position of the head is precisely controlled and the flow ends.

Therefore, the present invention has an effect of allowing the height and relative distance of the head of the V.C.alel to be measured more precisely by precisely controlling the position of the head through the photo sensor.

Claims (1)

In the method for precisely controlling the position of the head of the V.C. egg, the window is set in a waveform input to the monitor 8 through the position detecting sensor 14. And integrating the waveform formed in the window as the window is set (S10, S20, S30); The window is rotated by a predetermined amount if the integrated value is smaller than the threshold value compared to a predetermined reference threshold value compared to a predetermined reference threshold value in steps S10, S20, and S30. Returning to a setting step (S20) and shaping the waveform in the window if the integrated value is greater than the threshold value (S40, S50, S60); Comparing the waveforms normalized in the steps S40, S50, and S60 with reference waveforms for a predetermined model base, obtaining an error distribution curve, and measuring and detecting the slope of the error distribution curve (S70, S80); When the measured slope is less than the slope of the reference distribution curve, the measured and detected slope measured in the above steps S70 and S80 is compared with the slope of the predetermined reference distribution curve, and the process returns to the step S50. And otherwise precisely controlling the position of the head by positioning the hole of the drum at the peak value of the measured slope (S90, S100).