JP2009210367A - Imaging unit used for surface inspection device and surface inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized portable surface inspection device imaging the surface of an inspection object and inspecting thereof by image processing. <P>SOLUTION: An imaging unit 10 used for a surface inspection device imaging the surface of an inspection object W and inspecting thereof by image processing includes: an electronic imaging device 1 imaging the surface of the inspection object; a hood 2 protruding from the object side of the electronic imaging device to the front and having an opening part 3 which faces to the surface of the inspection object; an inspection object illuminating lamp 4 disposed movable at the inner side of the hood; and a knob 5 for performing position moving operation of the inspection object illuminating lamp. The surface inspection device is provided with the imaging unit and a computer system part having an arithmetic processing device for performing image processing of the imaged image data input from the electronic imaging device of the imaging unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging unit used in a surface inspection apparatus that images a surface of a test object and inspects the image by image processing, and a surface inspection apparatus.

  Various appearance inspection apparatuses are known in which the surface of a test object is imaged and inspected by image processing for a defective portion such as a scratch, indentation, dent, crack, chipping, and dirt on the surface of the test object without visual inspection. This appearance inspection apparatus images an object surface with an electronic imaging device (CCD camera, digital camera). The captured image data (pixel data) is introduced into an arithmetic processing unit (CPU, computer), binarized by the image processing unit, and the determination unit analyzes the defective portion of the article surface based on the image processing data.・ It is to detect.

Patent Document 1 discloses an appearance inspection apparatus that inspects a surface defect of a plate-like member having a large area such as a semiconductor wafer. Patent Document 2 discloses an appearance inspection apparatus that inspects cracks in a dome-shaped transparent body. Patent Documents 3, 4, and 5 disclose an appearance inspection apparatus that inspects a surface defect of a cylindrical object. Patent Document 6 discloses an appearance inspection apparatus that inspects defects in an annular article such as an O-ring. Patent Document 7 discloses an appearance inspection apparatus for inspecting an outer surface of a cap. Patent Document 8 discloses an appearance inspection apparatus that inspects a surface without moving or rotating a cylindrical part.
JP 2007-333491 A JP 2007-198781 A JP 2007-17194 A JP 2006-145503 A JP 2006-23090 A JP 2004-361223 A JP 2005-195332 A JP 2003-232748 A

  The appearance inspection apparatus as described above is mainly a stationary apparatus in an inspection process of an article manufacturing factory. For example, in an automobile body paint recycling factory, to check the state of fine scratches that are difficult to visually inspect the body surface before painting regeneration processing, and the surface condition after glass coating or mirror-coated coating regeneration, There is a need for a small and portable surface inspection device.

  It is an object of the present invention to provide an imaging unit and a surface inspection apparatus that can be used in a surface inspection apparatus that can meet the demand.

  A typical configuration of an imaging unit used in a surface inspection apparatus according to the present invention for achieving the above object is an imaging unit used in a surface inspection apparatus that images the surface of an object to be inspected by image processing, An electronic imager that images the surface of the test object, a hood that protrudes forward from the object side of the electronic imager and that has an opening facing the surface of the test object, and that can be moved to the inside of the hood. The test object illumination lamp is provided, and a knob for moving the position of the test object illumination lamp.

  In addition, a typical configuration of the surface inspection apparatus according to the present invention for achieving the above-described object includes the above-described imaging unit and an arithmetic processing unit, and captured image data input from an electronic imager of the imaging unit. And a computer system unit for image processing.

  The imaging unit used in the surface inspection apparatus of the present invention is a handy instrument that can be easily applied to each part of the surface of an object to be tested, such as the surface of an automobile body, by hand. By adjusting the position of the object illumination lamp, it is possible to easily obtain a captured image in which the defect state on the object surface is most clearly reflected. Using a notebook computer as a computer system unit, a small and portable surface inspection apparatus can be realized.

[Example 1]
FIG. 1 is a perspective view of the surface inspection apparatus of this embodiment. Reference numeral 10 denotes an imaging unit that magnifies and images a part of the surface of the test object. A computer system unit 20 performs image processing on captured image data input from the imaging unit 10. In this embodiment, a notebook personal computer is used. Reference numeral 30 denotes a small printer as an output device connected to the notebook computer 20.

  2 is a side view of the imaging unit 10, FIG. 3 is a sectional view taken along line (3)-(3) in FIG. 2, and FIG. 4 is a sectional view taken along line (4)-(4) in FIG.

  The imaging unit 10 includes an electronic imaging device 1 that magnifies and images a surface of a test object W, for example, a part of a car body surface, and an opening that projects forward from the object side of the electronic imaging device and faces the test object surface. 3 has a hood 2. Moreover, it has the test object illumination lamp 4 arrange | positioned inside the food | hood 2 so that a position movement is possible, and the knob 5 for operating position movement of a test object illumination lamp.

  In this embodiment, the electronic image pickup device 1 uses a CCD microscope (hereinafter referred to as a scope). Since the CCD microscope itself belongs to public knowledge, the description of its structure is omitted. Reference numerals 1a and 1b denote a focusing operation ring and a zooming operation ring provided in the scope 1. In this embodiment, the hood 2 is made of a stainless hemispherical dome having a circular opening 3 having a diameter of about 100 mm. The hood 2 is provided with a screw hole 2a shifted from the top, and the scope 1 and the hood 2 are integrally coupled by screwing the objective tip of the scope 1 into the screw hole 2a. ing. The optical axis (lens optical axis) O of the scope 1 is directed toward the center of the opening surface of the hood opening 3. The inner surface 2b of the hood 2 is a light scattering surface such as a satin surface. Further, the peripheral edge of the opening 3 of the hood 2 is edged by an elastic member 6.

  Reference numeral 7 denotes a semicircular arch type wire member disposed inside the hood 2, and both end portions thereof are rotatably supported by the hood 2 via bearing members 8 and 9, respectively, along the inner surface of the hood 2. It can be rotated. One end of the arched wire member 7 is extended to the outside of the hood 2 to form a lever portion 7a, and a knob 5 is attached to the lever portion 7a. The test object illumination lamp 4 is attached to substantially the center of the arched wire member 7. In the present embodiment, the object illumination lamp 4 is a planar light source configured by a set of a plurality of LED lamps (white LEDs). In the present embodiment, ten LED lamps 4b are arranged on the substrate 4a in the arrangement as shown in FIG. The assembly of LED lamps as the object illumination lamp 4 is covered with a light diffusing member 11 such as a milky white plate. When the arched wire member 7 is rotated by the knob 5, the object illumination lamp 4 moves along with the light diffusing member 11 along the inner surface of the hood 2. That is, the test object illumination lamp 4 is disposed inside the hood 2 so as to be movable. In the present embodiment, the object illumination lamp 4 is moved in the range of the angle α along the inner surface of the hood 2, and the bearing members 8 and 9 and the shaft of the arched wire member 7 are fitted to the moving position. It can be made into the state hold | maintained with the combined friction force.

  At the top of the hood 2, a knob 12 serving as a light amount adjusting operation unit is exposed to the outside, and a variable resistor 13 serving as a light amount adjuster for the object illumination lamp 4 is disposed. The test object illumination lamp 4 is energized via the variable resistor 13 by a power supply lead drawn from the scope 1 side. The amount of light emitted from the object illumination lamp 4 can be varied by operating the knob 12 of the variable resistor 13.

  The imaging unit 10 and the notebook computer 20 are electrically connected via the electric cord 14. Power is supplied from the notebook personal computer 20 side to the imaging unit 10 side through the electric cord 14. In addition, captured image data is input from the scope 1 of the imaging unit 10 to the arithmetic processing unit 21 of the notebook computer 20.

The surface of the test object is inspected as follows. The operator grasps the scope 1 portion as a handle, holds the imaging unit 10 in his / her hand, and brings the opening 3 of the hood 2 into contact with the surface of the test object W as shown in FIG. Since the peripheral edge of the opening 3 of the hood 2 is edged by the elastic member 6, there is no possibility of scratching the surface of the test object W due to the contact of the hood 2. The surface of the test object W corresponding to the opening 3 of the hood 2 is illuminated by the test object illumination lamp 4 inside the hood 2. A portion corresponding to the scope angle of view of the illuminated object surface is magnified by the scope 1. In the present embodiment, the surface of the test object in the range of approximately 1 to ² cm ² centering on the intersection of the optical axis O of the scope 1 and the test object surface is magnified. Then, the captured image data is input to the arithmetic processing unit 21 of the notebook computer 20 via the electric cord 14 and subjected to image processing, and the captured image is displayed on the monitor device (display device) 22 of the notebook computer 20. The operator performs a focusing operation and a zooming operation of the scope 1 while viewing an enlarged captured image of the surface of the test object displayed on the monitor device 22. Further, the object illumination lamp is operated by operating the knob 5 so that, for example, the state of the surface scratch is clearly displayed so that the state of the enlarged captured image of the surface of the object displayed on the monitor device 22 is the clearest. Adjust the position of 4. By changing the position of the test object illumination lamp 4, the illumination state of the test object surface changes, and the state of the enlarged captured image of the test object surface also changes. Further, the amount of light emitted from the object illumination lamp 4 is adjusted by operating the knob 12 of the variable resistor 13 so that the state of the enlarged captured image of the object surface projected on the monitor device 22 becomes the clearest. To do. Then, the enlarged captured image of the surface of the test object after the image state adjustment is printed out as a hard copy by the printer 30.

  By covering the test object illumination lamp 4 with the light diffusing member 11, even when the test object surface is in a mirror state, the reflection of the illumination lamp on the enlarged captured image of the test object surface is eliminated or alleviated. In addition, by adjusting the position of the object illumination lamp 4, the reflection of the illumination lamp on the enlarged captured image on the object surface is eliminated or alleviated. The hood 2 is not limited to the hemispherical dome shape of the embodiment, and can be a casing having an appropriate shape having the opening 3 facing the surface of the test object.

  As described above, the imaging unit used in the surface inspection apparatus of the present invention is a handy instrument that can be easily applied to each part of the surface of an object to be tested such as the surface of an automobile body by hand. By adjusting the position of the object illumination lamp, it is possible to easily obtain a captured image in which the defect state on the object surface is most clearly reflected. Using a notebook computer as a computer system unit, a small and portable surface inspection apparatus can be realized.

The perspective view of the external appearance inspection apparatus of an Example Side view of the imaging unit, (3)-(3) line sectional view of FIG. (4)-(4) line sectional view of FIG. Perspective view of test object illumination lamp and light diffusion member (milky white plate) of Example

Explanation of symbols

  W ······················································ Putor system unit (notebook type PC), 30 ·· Printer, 1 ·· Electronic imager (CCD microscope) Opening, 4 .... Test object illumination lamp, 5 .... Knob for moving the position of the test object illumination lamp

Claims (10)

An imaging unit used in a surface inspection apparatus that images a surface of a test object and inspects the image by image processing,
An electronic imager that images the surface of the test object, a hood that protrudes forward from the object side of the electronic imager and that has an opening facing the surface of the test object, and that can be moved to the inside of the hood. An imaging unit for use in a surface inspection apparatus, comprising: an object illumination lamp provided; and a knob for moving the position of the object illumination lamp.   The imaging unit according to claim 1, wherein the electronic imager is a CCD microscope.   The imaging unit according to claim 1, wherein the hood has a hemispherical dome shape.   The imaging unit according to claim 1, wherein an inner surface of the hood is a light scattering surface.   The imaging unit according to claim 1, wherein a peripheral edge of the opening is edged by an elastic member.   The imaging unit according to claim 1, wherein the object illumination lamp is covered with a light diffusion member.   The imaging unit according to claim 1, wherein the object illumination lamp is a planar light source configured by a set of a plurality of LED lamps.   The imaging unit according to claim 1, further comprising a light amount adjustment operation unit that varies a light emission amount of the test object illumination lamp.   An imaging unit according to claim 1, and a computer system unit that includes an arithmetic processing unit and that performs image processing on captured image data input from an electronic imager of the imaging unit. Surface inspection device.   The surface inspection apparatus according to claim 9, wherein the computer system unit is a notebook personal computer.