KR0183600B1 - A situation measurement device for head of the head assembly - Google Patents

Abstract

The present invention compares the state in which the head 192 is installed in the head drum assembly 180 with a reference value, and is for easily identifying whether or not there is a defect by outputting the amount of deviation.

The present invention is a head fixing assembly 110 for fixing the head drum assembly 180, the head 192 is installed up and down and left and right, and the front of the head 192 fixed to the drum fixing portion 110 The interference part 120 which irradiates light and interferes with the light reflected from the head 192 by this irradiated light, and the installation state of the head 192 by capturing the light interfered by the interference part 120. And a display unit 150 for outputting the image as an image that can be visually identified by the interference fringe.

The present invention determines the quality of the head drum assembly 180 and the assembly productivity of the product by selecting the head drum assembly 180 with the poorly installed head 192 by quickly and accurately determining the degree of poor installation of the head 192. Can be improved.

Description

Head attitude measuring device of head drum assembly

The present invention relates to an apparatus for measuring a posture of a head installed in a head drum assembly, and in particular, reflects light on the front surface of the head and interferes with reflected light, thereby charging an image of a head having an interference fringe formed according to contour lines. Coupled Device) The present invention relates to a head posture measuring apparatus of a head drum assembly for imaging with a camera and outputting to a monitor to inspect the installation state of the head.

In general, the head drum assembly is installed in a traveling system of a video cassette recorder to drive a video tape to its outer circumferential surface, thereby reproducing a video signal recorded on a video tape or converting an input video signal into a video tape. Is a device for recording on.

The head installed in the head drum assembly is formed of a ferrite core or the like to pick up the magnetic force lines recorded on the video tape while contacting the video tape or to record the magnetic force lines on the video tape by the input signal.

On the other hand, Figure 1 is a measuring device for inspecting the state that the head is installed in the head drum assembly.

The apparatus includes a drum fixing portion 30 for fixing the head drum assembly 10 provided with the head 14 and a CD camera 40 for magnifying and capturing the head 14 fixed to the drum fixing portion 30. And a vertical moving part 50 for moving the CD camera 40 in the vertical direction, a horizontal moving part 60 for moving the CD camera 40 in the front, rear, left and right directions, and the CD camera. It is composed of a monitor 70 connected to the 40 to visually output the image of the head 14 photographed.

Therefore, the device focuses on the front of the head 14 fixed to the drum fixing part 30 while moving the CD camera 40 in the horizontal or vertical direction, and enlarges the image of the head 14 to monitor the image. Output to 70.

On the other hand, the method of picking up and inspecting the image of the head 14 by the above apparatus is demonstrated by FIG.

As shown in (a), the head 14 is bonded to the front surface of the head base 16 on which the screw hole 18 is formed, and the head base 16 is a screw 20 fastened to the screw hole 18. Is coupled to the upper drum 12 of the head drum assembly 10. When the focus is formed on the front surface of the head 14 by the CD camera 40, the front surface of the image pickup device 42, the objective lens 44, the head 14, and the upper drum 12 installed on the CD camera 40 are provided. The central axis 22 of) is positioned on the optical axis 80.

Therefore, when the image of the head 14 is picked up by the image pickup device 42 of the CD camera 40, the enlarged screen of the head 14 shown in (B) is displayed on the monitor 70 connected to the CD camera 40. Is output.

If the screw hole 18, which is the center point of the head base 16 as shown in (a), is not on the optical axis, that is, when the head base 16 is engaged in a twisted state in the upper drum 12, the head ( 14) Adjust the horizontal moving part 60 of the measuring device while focusing on one point A (A) on the screen, and move the position of the objective lens 44 so that the screen of the boiling point is located at the ratio B. The monitor 70 is dimmed. Therefore, it is determined from the screen that the head base 16 is coupled to the upper drum 12 in a distorted state, and a corrective operation of correctly coupling the head base 16 to the head drum assembly 10 is performed.

However, in the measuring device as described above, the degree of blurring of one point of the head 14 output to the monitor 70 must be visually identified, so that the head base 16 is finely twisted to the upper drum 12. When coupled, the operator can not determine the poor installation state of the head 14, there is a problem that the quality of the screen reproduced by the head drum assembly 10 is poor.

The present invention has been made in order to solve the above problems, the head of the head drum assembly that can be easily identified by the user by outputting a numerical value compared to the state of the head installed in the head drum assembly, compared to the reference value. It is to provide a head posture measuring device.

The present invention for achieving the above object is a drum fixing unit for fixing the head of the head drum assembly is installed up and down and left and right, and irradiating light to the front surface of the head fixed to the drum fixing unit And a measuring unit comprising an interference unit which interferes with the light reflected from the head by the received light, and a display unit which picks up the light interfered by the interference unit and outputs the installation state of the head as a visually identifiable image. do.

1 is a schematic view showing a conventional head posture measuring device.

Figure 2 (a) is a view showing a conventional method of measuring the head posture measuring device.

(b) shows an enlarged screen of the head;

3 is a schematic view of a measuring device according to the present invention;

4 is a block diagram of a display unit according to the present invention;

5 shows a screen of a monitor according to the invention;

* Explanation of symbols for main parts of the drawings

110: drum fixing portion 120: interference portion

122: light source 124: optical cable

126: reflector 128: half mirror

130: full mirror 132, 134,162: moving knob

136: angle adjustment knob 150: display

152: CD camera 154: mix circuit

156: monitor 158: line generator

160: magnification correction switch 164: microcomputer

166: indicator 170: baseline

172 measurement line 174 contour line

180: head drum assembly 182: upper drum

186: head base 192: head

194: gap

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

The configuration of this embodiment will be described with reference to FIG.

According to the present embodiment, the head fixing assembly 110 for fixing the head drum assembly 180 provided with the head 192 to flow up and down and to the left and right, and the front surface of the head 192 fixed to the drum fixing portion 110 The interference part 120 which irradiates light and interferes with the light reflected from the head 192 by the irradiated light, and the installation of the head 192 by imaging the light interfered by the interference part 120. It is comprised by the display part 150 which outputs a state with the image which can be visually distinguished.

The interference part 120 is a light source 122 for supplying light through the optical cable 124, and a part of the light irradiated from the light source 122 is transmitted through the reflection part is fixed to the drum fixing portion 110 The half mirror 128 that reflects the front surface of the head 192 and transmits the reflected light to the display unit 150, and the light source 122 positioned at the same distance from the half mirror 128 to the head 192. ) Is made of a full mirror 130 reflecting the light transmitted through the half mirror 128 back to the half mirror 128 to interfere with the light reflected from the head 192.

At this time, when the light of the light source 122 is not directly irradiated to the half mirror 128, a reflecting mirror 126 is provided between the light source 122 and the half mirror 128 to refract the path of light.

The interference part 120 includes a moving knob 134 for moving the full mirror 130 up and down, a moving knob 132 for moving the full mirror left and right, and an angle for adjusting the reflection angle of the full mirror 130. Adjustment knob 136 is provided.

As shown in FIG. 4, the display unit 150 includes a CD camera 152 that enlarges and captures the light interfering with the half mirror 128, and a head that is photographed by receiving a video signal from the CD camera 152. A reference line 170 that intersects the image of 192 and a center point of the standard head 192 in a horizontal and vertical straight line, and a measurement line 172 that indicates an intersection line of horizontal and vertical at the center point of the imaged head 192. Visually identify a mix circuit 154 for mixing the video signal, a line generator 158 for providing a reference line 170 and a measurement line 172 to the mix circuit 154, and a video signal of the mix circuit 154. It consists of a monitor 156 that outputs the possible images.

The line generator 158 includes a magnification correction switch 160 for setting a unit distance between the reference line 170 and the measurement line 172 to a predetermined dimension, and the reference line 170 and the measurement line 172 to move up and down and left and right. A plurality of moving knobs 162, a microcomputer 164 calculating a horizontal and vertical distance difference between the standard line and the measurement line 172, and a measurement line 172 and a reference line 170 connected to the microcomputer 164. There is provided an indicator 166 for displaying the horizontal and vertical distance difference of the figure by visually identifiable numbers.

The operation of this embodiment will be described below.

First, the head base assembly 186 to which the head 192 is attached is fixed to the drum fixing unit 110 with the head drum assembly 180 installed at a standard position. Accordingly, the head 192 is prevented from flowing up and down and left and right together with the drum base 186.

Then, when the light source 122 irradiates light through the optical cable 124 of the interference unit 120, the light is reflected by the reflector 126 and irradiated to the half mirror 128. In the half mirror 128, a part of the light is transmitted to the full mirror 130, and a part of the light is reflected and irradiated to the front surface of the head 192 fixed to the drum fixing part 110. Accordingly, since the front surface of the head 192 has a curvature, only a part of the reflected light is irradiated to the half mirror 128 again, which causes constructive destructive interference by the light reflected from the full mirror 130.

At this time, if the light reflected from the full mirror 130 is not exactly irradiated to the half mirror 128, to move the angle adjusting knob 136 and the full mirror 130 to the left and right to adjust the reflection angle of the full mirror 130 The shift knob 132 is adjusted to adjust the reflection angle of the full mirror 130. If the distance from the half mirror 128 to the full mirror 130 is different from the distance from the half mirror 128 to the front of the head 192, the moving knob 134 is adjusted to move the half mirror 128 up and down. Adjust the distance.

On the other hand, the CD camera 152 captures the light interfering from the half mirror 128, which is converted into a video signal and transmitted to the mix circuit 154.

The mix circuit 154 mixes the video signal of the head 192 transmitted from the CD camera 152 with the generated signals of the reference line 170 and the measurement line 172 supplied from the line generator 158 to monitor 156. )

At this time, the screen output to the monitor 156, as shown in Figure 5, the pattern of the contour line 174 appears by the constructive destructive interference on the enlarged image of the head 192, the gap 194 is formed. The smallest and clearest part of the contour line 174 indicates the protruding portion of the front of the head 192 closest to the half mirror 128, and the large, blurred pattern on the outside thereof is the half mirror. This is to indicate a gradual distance from 128.

If the head base 186 is correctly installed in the head drum assembly 180 fixed to the drum fixing unit 110 as shown in FIG. 3, the pattern of the contour line 174 that is output to the monitor 156 is the head. 192 is located in the gap 194 of the front surface, and if the installation state of the head base 186 is poor and twisted, as shown in FIG. 5, the pattern of the contour line 174 is the gap 194 of the head 192. Away from one side.

In this state, the movement knob 162 provided in the line generator 158 is adjusted to move the reference line 170 to position the center line of the contour line 174. Thus, the baseline 170 is set such that the head base 186 coincides with the gap 194 of the head 192 installed at the standard position.

In this state, the head drum assembly 180 fixed to the drum fixing unit 110 is separated, and the head drum assembly 180 to be inspected is fixed to the head drum fixing unit 110.

When light is irradiated to the front surface of the head 192 by the light source 122 of the interference unit 120, the light reflected from the front surface of the head 192 and the light reflected from the full mirror 130 are reflected by the half mirror 128. The constructive destructive interference occurs, and the monitor 156 of the display unit 150 superimposes the pattern of the contour line 174 on the enlarged image of the head 192.

At this time, the reference line 170 provided by the line generator 158 is located in the gap 194 of the head 192. In this state, the moving knob 162 provided in the line generator 158 is adjusted to move the measurement line 172 to be positioned at the center position of the contour line 174.

Accordingly, the microcomputer 164 provided in the line generator 158 calculates the horizontal distance X and the vertical distance Y between the reference line 170 and the measurement line 172 and outputs the same to the display 166. Therefore, the user can determine the degree to which the head 192 is badly installed in the head drum assembly 180 from the number output on the indicator 166, and from this value, the installation state of the head base 186 to which the head 192 is bonded is determined. Select the product to be calibrated.

When the unit distance of the screen output to the monitor 156 is changed to a predetermined value, the unit distance of the screen of the monitor 156 is adjusted to the line generator 158 by adjusting the magnification correction switch 160 installed in the line generator 158. Is displayed on the display 166.

After the measurement of one head drum assembly 180 is finished, the head drum assembly 180 is detached from the drum fixing unit 110, and the other head drum assembly 180 is fixed to the drum fixing unit 110. Repeat the same way.

As described in the above embodiment, the present invention outputs the state in which the head 192 is installed in the head drum assembly 180 to the screen, and at the same time the head 192 is separated from the reference position to be in the measurement position. A head 192 posture measuring device of the head drum assembly 180 represented by a number, wherein a user can quickly and accurately determine the degree of defective installation of the head 192 to determine the head drum assembly 180 having the poorly installed head 192. By sorting, there is an effect of improving the quality of the head drum assembly 180 and the assembly productivity of the product.

Claims (5)

In the apparatus for measuring the attitude of the head drum assembly 180, head 192, The drum fixing unit 110 to fix the head drum assembly 180, the head 192 is installed to flow up and down and left and right, and the front of the head 192 fixed to the drum fixing unit 110 The interference part 120 which irradiates and interferes with the light reflected by the head 192 by this irradiated light, and the image which interfered with the installation state of the head 192 by image | photographing the light interrupted by the said interference part 120 A head posture measuring apparatus for a head drum assembly, comprising: a display unit (150) for outputting an image visually discernible by a pattern. The drum fixing part of claim 1, wherein the interference part 120 transmits light through the optical cable 124, and a part of the light irradiated from the light source 122 passes through and partially reflects the drum fixing part. A half mirror 128 that reflects the front surface of the head 192 fixed to 110 and transmits the reflected light to the display unit 150, and a distance equal to the distance from the half mirror 128 to the head 192. It is located in the light source 122 is irradiated from the half mirror 128 and transmitted to the half mirror 128 is reflected back to the half mirror 128, characterized in that composed of a full mirror 130 that interferes with the light reflected from the head 192 Head posture measuring device of the head drum assembly. The method of claim 2, wherein the interference unit 120 has a moving knob 134 for moving the full mirror 130 up and down, a moving knob 132 for moving left and right, and a reflection angle of the full mirror 130. Head attitude measuring device of the head drum assembly, characterized in that the adjusting angle knob 136 is provided. The display unit 150 of claim 1 or 2, wherein the display unit 150 receives the video signal from the CD camera 152 and the CD camera 152 to enlarge and capture the light interfered with the half mirror 128. The reference line 170, which is an intersection of the image of the head 192 with the center point of the standard head 192, in a horizontal line and a vertical line, and the measurement line, which is represented by an intersection line of the horizontal and vertical line, at the center point of the imaged head 192 ( A mix circuit 154 for mixing 172, a line generator 158 for providing a reference line 170 and a measurement line 172 to the mix circuit 154, and a video signal of the mix circuit 154 with the naked eye. Head attitude measurement apparatus of the head drum assembly, characterized in that consisting of a monitor (156) for outputting an image that can be identified. 5. The line generator 158 includes a magnification correction switch 160 for setting a unit distance between the reference line 170 and the measurement line 172 to a predetermined dimension, and the reference line 170 and the measurement line 172. A plurality of moving knobs 162 for moving the controller up, down, left, and right, a micom 164 calculating a horizontal and vertical distance difference between the standard line and the measurement line 172, and a measurement line connected to the micom 164. 172 and an indicator (166) for displaying the horizontal and vertical distance difference between the reference line 170 and the visually identifiable number.