JP2014106192A - Exterior appearance inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: in an exterior appearance inspection device employing a transparent rotary table, since a work piece moves in an outer peripheral direction by centrifugal force, a rotary velocity of the rotary table cannot be increased, and a camera or illuminations cannot be disposed flush with the work piece at a rotation center, and thus, imaging accuracy is deteriorated.SOLUTION: An exterior appearance inspection device according to the present invention comprises: work piece feeding means (a feeder 1) that feeds a work piece W; a transparent belt conveyer 2 that uses a hard coat film conveying the work piece W; illumination means (lights 4A to 4F) and imaging means (cameras 3A to 3F) that are provided respectively on a surface side at an upper part of a conveyance surface of the transparent belt conveyer 2 and on a rear surface side at a lower part thereof, right and left in a width direction of the conveyance surface at the same height position with the conveyance surface, and in front of and behind in a conveyance direction at the same height position with the conveyance surface; determination means (a determination part 5) that determines whether the work piece W is non-defective or not; a non-defective work piece storage part 6 that stores a non-defective work piece W; and a defective work piece storage part 7 that stores a defective work piece W.

Description

  The present invention relates to an appearance inspection apparatus that inspects the appearance and dimensions of a minute object (hereinafter referred to as a workpiece in the present application) such as a capacitor chip, and separates a non-defective product and a defective product by a sorting device based on the inspection result. It is.

  As shown in Patent Documents 1 to 3, for example, conventional micro-object appearance inspection apparatuses convey a workpiece onto a transparent rotary table made of a glass plate, and image a workpiece with illumination and a camera arranged around the rotary table. In addition, the appearance, wrinkles, dimensions, and the like are inspected from the imaged data by image processing technology, and are classified into non-defective products and defective products based on the inspection results.

  However, in a conventional visual inspection apparatus using a transparent rotary table, first, the rotational speed of the rotary table can be increased only to a speed at which the workpiece does not move in the outer circumferential direction due to centrifugal force. In addition, it is necessary to go back to the shape of the workpiece that becomes lighter, and on the contrary, it is necessary to slow down the rotation speed of the rotary table.

  In addition, in the conventional visual inspection apparatus using a transparent rotary table, the camera or illumination cannot be arranged horizontally with the workpiece at the (rotation) center portion of the rotary table. Since an image is taken with a camera and illumination provided obliquely above, there is a problem that imaging accuracy is lowered due to different unnecessary shadows and illuminance.

JP 2010-216950 A JP 2008-105811 A JP 2010-249513 A JP 2012-66894 A

  The problem to be solved is that the conventional visual inspection apparatus using a transparent rotary table cannot increase the rotational speed of the rotary table because the workpiece moves in the outer peripheral direction by centrifugal force. Since the camera and the illumination cannot be arranged horizontally with the work, the imaging accuracy is lowered.

  The present invention provides a workpiece supply means for supplying a workpiece, a transparent belt conveyor using a hard coat film for conveying the workpiece, the upper surface side and the lower surface side of the conveying surface of the transparent belt conveyor, and the same height as the conveying surface. Based on the image of the workpiece imaged by the illuminating means and imaging means provided respectively at the position in the width direction right and left of the conveying surface, and at the same height position as the conveying surface in the front and rear of the conveying direction, respectively. The main features are a determination means for determining pass / fail, a non-defective product storage section for storing a non-defective workpiece determined by the determination means, and a defective storage section for storing a defective work.

  Since the present invention uses a transparent belt conveyor, there is an advantage that the workpiece can be imaged from the back side of the conveyance surface of the workpiece being conveyed, and the imaging means is located at the same height position on the conveyance surface at the front and rear positions in the conveyance direction. Since illumination means can be provided, there is an advantage that illumination and imaging accuracy are increased.

1A and 1B show a schematic configuration of an appearance inspection apparatus according to the present invention. FIG. 1A is a diagram viewed from a side surface direction, and FIG. 1B is a diagram viewed from a plane direction.

  The present invention replaces the problems existing in the appearance inspection apparatus using a transparent rotary table, that is, the point that the rotational speed of the rotary table cannot be increased and the imaging accuracy is lowered with a transparent rotary table. This is solved by adopting a transparent belt conveyor, and providing illumination means and image pickup means at the same height as the conveyance surface in the conveyance surface width direction right and left, front and rear in the conveyance direction.

  Hereinafter, an appearance inspection apparatus according to the present invention will be described with reference to FIG. Note that FIG. 1 is schematically and exaggerated for easy understanding of the invention.

  In FIG. 1, reference numeral 1 denotes a feeder (work supply means) using, for example, high-frequency vibration as a thrust. The feeder 1 transports a minute electronic device (hereinafter referred to as “work”) W such as a capacitor chip as a conveyance path. The sheet is fed while being aligned with the transparent belt conveyor 2 while applying high-frequency vibrations.

  2 is a transparent belt conveyor using a hard coat film. The hard coat film can be bent thinly compared to the conventional glass plate, so it can be used in a belt conveyor, so that it can be conveyed in a straight line at a high speed, and the bottom surface inspection has the same optical conditions as the top surface inspection. There is a merit that

  The feeder 1 is inclined so that the front end is directed downward toward the transparent belt conveyor 2, and a gap that can be imaged by a camera 3 </ b> D to be described later is formed on the transport surface (belt surface) of the transparent belt conveyor 2. It is located above the space.

  Reference numeral 3 denotes a camera as an image pickup means provided around the transparent belt conveyor 2, and the following cameras are collectively referred to as a camera 3. As shown in FIG. 1A, the camera 3 has a camera 3A above the transport surface of the transparent belt conveyor 2, a camera 3B below the back surface, a camera 3C forward in the transport direction, and a camera 3D behind. However, as shown in FIG. 1B, a camera 3E is provided on the right side in the transport surface width direction of the transparent belt conveyor 2, and a camera 3F is provided on the left side.

  Reference numeral 4 denotes a light as an illuminating means provided at the same position as the camera 3, that is, at the same position as a lens and a flash (strobe) in the case of a camera for taking a photograph. Are collectively referred to as light 4. As for the light 4, the lights 4A-4F are provided in each of the cameras 3A-3F.

  The camera 3C and the light 4C (front), the camera 3D and the light 4D (rear), the camera 3E and the light 4E (right), the camera 3F and the light 4F (left) are parallel to the work surface with the work W on the transport surface. It is provided so that it may become the same height as the conveyance surface of the transparent belt conveyor 2 so that it may be caught with a simple optical axis.

  That is, in the appearance inspection apparatus of the present invention, since the camera 3 and the light 4 can illuminate the workpiece W horizontally and take an image, the imaging accuracy is remarkably improved.

  Further, the camera 3G and the light 4G are provided opposite to each other through the belt of the transparent belt conveyor 2 on the return path side when the side of the transparent belt conveyor 2 that conveys the workpiece W is the forward path. The camera 3G is for taking an image of a belt that is not transporting the workpiece W.

  Reference numeral 5 denotes a determination unit (determination unit) that performs image processing on data captured by the camera 3 and determines that a defect is detected when wrinkles or dirt is detected in the image data, and a non-defective item is detected otherwise. The determination unit 5 also performs a process of matching the data separately captured in time for one workpiece W into one. Then, the determination unit 5 determines a good product and a defective product based on the imaging data, and outputs an operation signal toward the pusher 7A described later in the case of the defective product.

  In addition, the determination unit 5 knows at any time on the belt where dust, dirt, or wrinkles are present based on the position information of the belt with the address and the image data captured by the camera 3G. Cancel the noise of the belt position where dust and trash are present. By doing so, it is possible to suppress erroneous determination of the workpiece W as a defective product due to dust on the belt or the like.

  Reference numeral 6 denotes a non-defective product storage unit that stores a non-defective workpiece W provided at a position where the transparent belt conveyor 2 is fed in the transport direction from the horizontal transport site to the pulley unit. Reference numeral 7 denotes a defective product storage unit that stores, for example, a defective workpiece W pushed out by the pusher 7A from the side of the transparent belt conveyor 2 in the conveying direction. As described above, the pusher 7 </ b> A is operated by the operation signal of the determination unit 5.

  The appearance inspection apparatus having the above configuration can increase the inspection quantity of the work W per unit time because the work W does not move on the transport surface even if the speed of the transparent belt conveyor 2 is increased. Since the image can be taken while the posture is maintained, the determination accuracy is not lowered even if the speed of the transparent belt conveyor 2 is increased.

  In addition, since the cameras 3C to 3F (and the lights 4C to 4F) are provided so as to be at the same height as the transport surface of the transparent belt conveyor 2 so that the workpiece W can be captured by an optical axis parallel to the transport surface, It is possible to suppress the adverse effects of the illuminance unevenness of the light 4 relating to the imaging accuracy (inspection accuracy) and the visual field of the camera 3.

  In the above configuration, an example is shown in which the workpieces W are conveyed in one row in the width direction on the conveying surface of the transparent belt conveyor 2, but the wide transparent belt conveyor 2 is employed, for example, the front and rear positions are shifted in the conveying direction. The workpieces W may be transported in a plurality of rows in the width direction. In this way, the appearance inspection can be performed more efficiently without hindering the operation of pushing the defective work W by the pusher 7 </ b> A to the defective product storage unit 7.

  In addition, regarding the separation of the non-defective product and the defective product of the workpiece W, in the above, the defective workpiece W is pushed out to the defective product storage section 7 by the pusher 7A. You may make it remove, and you may make it blow off by an air blow. When the workpiece W is a precision electronic device, the air blow does not damage the workpiece W.

1 Feeder (work supply means)
2 Transparent belt conveyor 3 Camera (imaging means)
4 Light (lighting means)
5 Judgment part (judgment means)
6 Good product storage 7 Defective product storage

Claims (3)

  A device for inspecting the appearance of a minute work, a work supply means for supplying the work, a transparent belt conveyor for transporting the work, a front surface side upper side and a back side lower side of the transparent belt conveyor, a transport surface, Illumination means and imaging means provided on the right and left sides in the width direction of the conveyance surface at the same height position, and front and rear in the conveyance direction at the same height position as the conveyance surface, and the workpiece imaged by the imaging means, respectively. An external appearance comprising: a determination unit that determines pass / fail based on an image; a non-defective storage unit that stores a non-defective workpiece determined by the determination unit; and a defective storage unit that stores a defective workpiece. Inspection device.   The visual inspection apparatus according to claim 1, wherein a hard coat film is used for the transparent belt conveyor.   Illumination means and imaging means are provided opposite to each other via the belt on the return path side when the workpiece conveying side of the transparent belt conveyor is the forward path, and noise generated on image processing due to dust on the belt is detected by the determination means. The appearance inspection apparatus according to claim 1, wherein the noise is canceled by grasping before imaging.

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