KR0171689B1 - Device for measuring perpendicularity - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the verticality of a structure such as a column vertically installed with respect to a reference plane. Particularly, the verticality of deck odometer posts installed in a video tape recorder (VTR) or a camcorder is described. Measuring unit for obtaining image data by optically observing an object to be suitable for precise measurement, measuring unit driving means for attaching the measuring unit to drive in the X, Y, Z direction perpendicular to each other, and vertical using the image data It has a configuration including a data processing unit that calculates the degree and displays it externally, and can reduce the defect rate of the product through the ease and accuracy of the measurement, thereby improving the quality competitiveness of the product, in particular, When used for the measurement of posts, if the verticality of the fixed posts is well maintained, the adjustment is easy in the last step. Am will play a large role in stabilizing the travel system operation, characterized by having the benefits currently find a processor that is a problem during installation of the fixed post occurs.

Description

Vertical measuring device

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the VTR deck odometer which is a measurement object, and its post.

2 is a plan view and a front view showing the structure and operation of the measuring unit and the measuring unit driving means of the present invention.

3 is a view for explaining the structure of the measuring unit of the present invention.

4 is a diagram illustrating one form of an image obtained by the measuring unit of the present invention.

* Explanation of symbols for main parts of the drawings

10: Deck odometer 11: Base of deck odometer

12: Post (object) 12´: Reference position (virtual)

20: X-Y axis drive unit 21: X-Y table

22.25: drive motor 23.26: shaft arm part

24.27: shaft fixing part 28: moving plate

29: fixed column 30: measuring unit

31: probe 32: lens unit

33: imaging camera 34: lens

35: optical path changing part 35´: installation part of the optical path changing part

36-1: First Reflector 36-2: Second Reflector

37: light source unit 50: Z-axis drive unit

51: Z axis guide post 52: shaft connection

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the verticality of a structure such as a column vertically installed with respect to a reference plane. Particularly, the verticality of deck odometer posts installed in a video tape recorder (VTR) or a camcorder is described. A non-contact perpendicularity measuring device suitable for precise measurement.

In order to record and play back video signals, audio signals, and control signals recorded on tapes, the tape odometer posts of VTVs or camcorders are placed in a fixed position of VTVs or camcorder head drums and audio / control heads. It plays a role to make sure it passes correctly.

Therefore, a plurality of deck traveling system posts are provided perpendicular to the deck base surface in accordance with the position of the head. There are also posts (variable posts) that can adjust the length or angle to the deck base surface after installation, but most of the fixed posts cannot be adjusted after installation because they are fixedly attached to the deck base. Therefore, the fixed posts require accurate vertical installation at the time of installation. In addition, even in the case of a variable post, if the verticality error of the fixed post is large, there may be no benefit of post adjustment in the whole deck odometer post system.

Therefore, accurate vertical installation of deck odometer posts before product completion is an important issue at the manufacturing stage, so in the case of vertical measurement using a contact probe at the deck manufacturing stage, the vertical state is a defect that exceeds the error limit. The problem was solved by repeating the process such as reinstallation.

Such a contact verticality measuring device is a device for measuring the vertical state by directly contacting the probe with the upper and lower portions of the post installed in the deck odometer base.

However, the contact verticality measuring device is a device mainly used for inspection of a general VRT, and a measurement of a small post installed in a deck odometer of a small product such as an 8 mm video cassette recorder (VCR). Its difficult to apply. And, since the probe is in direct contact with the post, the surface of the post is damaged by the contact pressure of the probe, which may cause the tape surface to be damaged when used after the completion of the product. This problem of post surface damage is a problem that can occur not only in a small product but also in the case of a general VT.

In addition, in the case of a small product, since the deck itself is also small, the diameter of the post is small, so that a small position error occurs during probing, and such a small error of the probing position causes a measurement value error, thereby causing a problem of accurate verticality. .

The present invention to provide a non-contact inspection apparatus that can measure the verticality without contacting the measuring unit of the measuring device, that is, probe, etc. to the object to measure the verticality in order to solve the problems associated with the contact verticality measurement A device for measuring the verticality of an object installed perpendicularly to a reference plane, the device comprising: a measuring unit for optically observing the object to obtain image data; Measurement unit driving means for driving in the Y, Z direction, and a data processing unit for calculating the vertical degree using the image data, and displayed on the outside, it is not a method of directly contacting the probe, optically vertical It adopts a non-contact measurement method that obtains an image representing the state and measures the verticality with the data.

In order to measure the verticality of an object installed vertically with respect to the reference plane, in particular, a VT post such as a deck odometer, the verticality measuring device of the present invention checks whether the posts are perpendicular to the deck odometer base plane as a reference plane. . As a method of evaluating the vertical degree, there is a method of measuring the inclination of the object with respect to an arbitrary plane, a method of defining it as a deviation from a reference position with respect to the object of a predetermined length, and the like. Adopt the latter method.

The size and shape of VT's deck odometer posts vary depending on the product and function, but the length is usually 7-25mm, the diameter is about 1.0-2.5mm, the surface roughness is 0.8s, and the roughness is very smooth. Reflectivity to light is excellent.

As described above, since the verticality measurement of the object having a smooth surface is premised, the verticality measuring device of the present invention obtains an image in which the vertical state of the object is known by the measuring unit, and converts the image into a digital signal in the data processing unit. Using this digital signal, the vertical degree is calculated by the microprocessor of the data processing unit. The calculated verticality state can be displayed through the external display.

In detail, when the measurement unit obtains an image of the object, the image is obtained in two directions perpendicular to each other, thereby obtaining an inclination in three-dimensional space. In addition, since the vertical measuring method using the deviation with respect to the reference position is adopted, the vertical measuring apparatus of the present invention obtains an image of the upper and lower objects in two directions, respectively, one of the two images, for example, The vertical degree is calculated from the positional deviation of the lower image with the upper image as the reference position.

In addition, there is a measuring unit driving means for driving the measuring unit three-dimensionally, first moving the measuring unit in the upper position of the object to be measured, and then driving the measuring unit in the longitudinal direction of the object, while obtaining the desired image of the object from the measuring unit.

The structure and operation will be described with reference to the drawings illustrating an embodiment in which the vertical degree measuring apparatus of the present invention is implemented in more detail.

(A) of FIG. 1, and (b) of FIG. 1 are figures for demonstrating the VTD deck odometer post which is an example of the improvement of perpendicularity measurement.

(A) of FIG. 1 is a plan view of the VT deck traveling system 10, in which a plurality of posts 12 are provided perpendicular to the base 11.

FIG. 1B is a right side view of the VRT deck traveling system 10.

(C) of FIG. 1 is a figure of the VTI deck odometer post 12, and shows a state when the 10 mm long post is inclined by the deviation D from the desired reference position 12 '.

2 (a) and 2 (b) are a plan view and a front view of the apparatus showing the overall appearance (excluding the data processing unit) of the verticality measuring apparatus of the present invention.

As shown in the drawings of (a) and (b) of FIG. 2, the verticality measuring apparatus of the present invention is largely composed of a measuring unit 30 and measuring unit driving means 20 and 50.

The measuring unit has a probe 31 which obtains an image of the object in two perpendicular directions by inserting the object through the lower part opened at the lowermost part, and is connected to the upper part to enlarge the image obtained from the probe 31. Or there is a lens unit 32 for reducing, there is an image pickup camera 33 is connected to the upper portion formed to record and store the image.

The measuring unit 30 is relatively connected to the measuring unit driving means 20 and 50 and is driven parallel or perpendicular to the base of the deck odometer 10 to be measured.

For convenience, when the two axes of the flat mountain on the base are named X and Y axes, and the axis perpendicular to this plane is called the Z axis, the XY axis driver 20 provides a driving force for driving the measurement part in the X and Y directions. One pair of drive motors 22 and 25, a pair of shaft arm parts 23 and 26 connected to the drive motors 22 and 25, and having a screw on the surface thereof, and one end of the shaft arm part. A pair of shaft fixing parts 24 and 27, a driving motor 22 and 25 and shaft fixing parts 24 and 27 are fixed, and the other driving motor and the shaft connected thereto are operated by the operation of one driving motor. A rectangular XY table 21 and a Z-axis drive unit 50 are fixedly mounted to each other by a rail (not shown in the drawing) and a rail (not shown in the drawing) to which the fixed motor can linearly move. 23 and 26, the movable plate 28 is moved in the XY direction.

In addition, the Z-axis drive unit 50 has a Z-axis guide post 51 fixedly attached to the lower portion of the movable plate 28, and an axis connecting portion connecting the measurement unit 30 and the Z-axis guide post 51 ( 52) and a drive source (not shown) which provides a driving force to linearly move the measurement section along the Z-axis guide post via a side connection. At this time, the drive source for driving the Z-axis drive unit can be implemented by installing a hydraulic drive device that is operated by the pressure of a fluid such as a motor or air.

On the other hand, the measuring unit driving means is supported by a fixed column 29 installed in the entire base 40 of the device.

Therefore, in the vertical measuring apparatus of the present invention, the measuring unit 30 is positioned on the position where the post to be measured is located through the XY driving unit 20, and then the Z-axis driving unit 50 is operated to measure the measuring unit 30. A part of the post 12 is inserted into the probe 31 of the probe 31 to obtain a desired image from the probe 31, and the Z axis driver 50 is operated again to move the probe 31 above the post 12. After moving to, the operation of placing the probe 31 above the position of the post 12, which is the next measurement target, is repeatedly performed.

3 (a) to 3 (c) are diagrams exemplified for explaining the detailed structure of the measuring unit 30 in the perpendicularity measuring apparatus of the present invention.

FIG. 3 (a) is a view for explaining the overall structure of the measuring unit 30 of the vertical measuring device of the present invention. There is a probe 31 for inserting and obtaining an image of the object in two perpendicular directions, and there is a lens unit 32 connected to an upper portion thereof to enlarge or reduce an image obtained from the probe 31. There is an image pickup camera 33 which is formed to connect and record the image. In addition, an optical path conversion unit 35 for converting an optical path near the optical axis of the lens unit 34 is further provided on the probe 31, and the optical path conversion unit 35 has two flat glass plates. It can be realized by installing a V-shaped glass made by joining in shape.

(B) of FIG. 3 is sectional drawing by the cutting line b-b of (a) of FIG. 3, and the outer circle is the lens part 32, and the inner circle is the probe 31. FIG. Reference numeral 35 'denotes an optical path conversion unit installation position, in which the light source unit 37 and the first and second reflecting units 36-1 and 36-2 are located in the inner circle, and the object 12 is located therebetween.

Again, the probe 31 has a light source unit 37 for irradiating light to the inserted object 12 and light irradiated from the light source unit 37 reflected by the object 12 as shown in FIG. The first and second reflectors 36-1 and 36-2 receive incident images and reflect toward the lens 34 of the lens unit 32. The first and second reflectors 36-1 and 36-2 are symmetrically formed at a predetermined angle with respect to the extension line of the connection line connecting the light source unit 37 and the object 12 to each other, so that the images are perpendicular to each other. To be incident. (An arrow in the figure shows an optical path.) In addition, the first reflecting portion 36-1 or the second reflecting portion 36-2 is a right-angle prism or a flat mirror inclined to a plane parallel to the base at 45 °. Implement with

On the other hand, the probe is formed to be detachable to the lens unit so that the probe can be used in a different tube size depending on the conditions of the measurement object.

4 is an image obtained by the measuring unit 31 of the vertical measuring apparatus of the present invention is incident on the imaging camera 33 through the optical path changing unit 35 and the lens unit 32, and applied to the data processing unit. Afterwards, when the data converter displays the image through the external display device, one example of an image displayed on the external display device is illustrated.

(A) of FIG. 4 is a screen which caught an upper image, and (b) of FIG. 4 is a screen which caught a lower image.

In Fig. 4A, the line 61 is an image in the X-axis direction, and the line 62 is an image in the Y-axis direction.

In FIG. 4B, reference numerals 61 'and 62' are lines indicating reference positions based on the upper image, and 63 and 64 are lower images. Therefore, the distances x and y between the reference position of the upper image and the lower image are deviations from the reference position in the X-axis and Y-axis directions.

The data processing unit calculates the slope in one direction by calculating the deviation as an average.

Therefore, when the obtained slope exceeds the marginal error, the deck is taken out, the verticality error of the post is corrected, and the post is measured vertically so that the post is installed exactly vertically.

On the other hand, in the present specification, but mainly described as a VTD deck odometer post, as the object of the vertical measurement device of the present invention is smooth surface, such as 0.8s, reflective, and is installed perpendicular to the reference plane It can also be used to measure the verticality of an object.

As described above, the non-contact verticality measuring method of the present invention and the verticality measuring device using the same can perform the measurement without actually contacting the measuring object by using an optical principle, unlike the conventional contact measuring method. Problems such as the occurrence of an error due to the conventional contact can be solved. In addition, this can be sufficiently applied even when measuring for an object having a small measuring space. In addition, it is possible to measure by freely moving the measurement unit in the X, Y, Z axis direction, even if the measurement object is different, it is possible to easily measure without the need for a separate setting.

In addition, since the defect rate of the product can be lowered through the ease and accuracy of the measurement, the quality competitiveness of the product can be improved, and in particular, when used for the measurement of the posts of the deck odometer of the small VCR, If it is well maintained, it will not only make adjustments easier in the last stage, but will also play a major role in stabilizing the odometer operation, and may have the advantage of finding a processor that is currently experiencing problems with the installation of fixed posts.

Claims (6)

A verticality measuring device for measuring the verticality of an object installed perpendicular to a reference plane, comprising: a measuring unit for optically observing the object to obtain image data, and attaching the measuring unit to the X, Y, and Z directions perpendicular to each other And a measuring unit driving means for driving the apparatus, and a data processing unit for calculating a vertical degree using the image data and displaying it externally. The probe of claim 1, wherein the measuring unit is inserted into the object through an open lower portion to obtain an image of the object in two perpendicular directions, and is connected to an upper portion of the probe to enlarge or enlarge the image. And an image pickup camera connected to an upper portion of the lens unit to reduce and record the image. The lens of claim 2, wherein the probe receives a light source unit for irradiating light to the inserted object and an image from which light emitted from the light source unit is reflected by the object in a direction perpendicular to each other. A perpendicularity measuring device formed by first and second reflecting portions reflecting toward each other. 4. The optical path changing method of claim 3, wherein the probe converts two images reflected on the first and second reflectors on the first and second reflectors to near the optical axis of the lens. Verticality measuring device characterized in that formed by installing the part. The device of claim 4, wherein the optical path changing unit is a V-shaped glass made by laminating two flat glasses in a V shape. 3. The XY axis drive unit according to claim 2, wherein the measuring unit driving means includes an XY table for driving the measuring unit in X and Y directions parallel to the reference plane of the object, and in the Z direction perpendicular to the reference plane of the object. Vertical measuring device consisting of a Z-axis drive unit for driving the measurement unit.