JP5205335B2 - Inspection device - Google Patents

Description

  The present invention relates to an inspection apparatus for inspecting an inspection object having a transparent body such as a lamp.

  For example, as shown in FIG. 4, a lamp 1 such as a wedge base sphere has a configuration in which a lead wire 3 and a filament 4 are enclosed in a bulb 2 made of colorless and transparent glass. Further, as shown in FIG. 2, identification information such as a product number 6 including characters / symbols indicating a product number / model number is printed on the surface of the valve 2.

  As a method for performing surface inspection (inspection for scratches, cracks, chipping, etc.) of a transparent body such as the bulb 2 and inspection of the printed state of identification information attached to the transparent body (inspection for chipping, blurring, blurring, etc.) For example, as shown in FIG. 11, the irradiation unit 51 irradiates light to the bulb 2 as a transparent body, and images the bulb 2 irradiated with light using the CCD camera 52 from the opposite side. A method of performing a determination by an image processing device based on image data captured by the CCD camera 52 is conceivable (see, for example, Patent Document 1).

JP 2004-317188 A

  However, for example, when the product number 6 attached to the surface of the valve 2 is inspected by the above inspection method, the filament 4 etc. inside the valve 2 overlap with the product number 6 as shown in FIG. Since the image is captured, the product number 6 cannot be determined in the obtained image data, and an appropriate inspection cannot be performed.

  For this reason, conventionally, when inspecting the surface of the valve 2 for scratches or the identification information such as the product number 6 attached to the valve 2, it is not necessary to rely on a visual inspection by an operator, and it takes much time and cost. In addition, there was a large variation in inspection accuracy.

  This invention is made | formed in view of the said situation, and makes it one of the main objectives to provide the inspection apparatus which can test | inspect a transparent body.

  Hereinafter, each means suitable for solving the above-described problem will be described separately. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. Irradiation means for irradiating a predetermined light to an inspection object having a transparent or translucent transparent body and a non-transparent member arranged inside the transparent body;
Light that has entered from the incident surface facing the inspection object is transmitted to the other exit surface, and an optical image of the inspection object is displayed on the exit surface, which is more distant than the part that is far from itself. A projecting means for more clearly projecting a portion located near,
Imaging means for capturing an optical image of the inspection object projected on the projection means;
Image processing means for determining the quality of the transparent body based on the image data imaged by the imaging means ,
2. The inspection apparatus according to claim 1, wherein an incident surface of the projection unit includes a curved portion formed corresponding to the curved portion of the transparent body .

According to the means 1, it is possible to acquire image data of the inspection object in a state where the part located near the projecting means is projected more clearly and the part located far away is blurred. In other words, when imaging the inspection object such as a lamp, even if the identification information attached to the surface of the transparent body and the internal non-transparent member are in a positional relationship overlapping in the imaging direction, the non-transparent member is Since the image is displayed in a blurred state and can be sufficiently processed by filter processing or the like by the image processing means, image data from which only identification information can be extracted can be acquired. Accordingly, it is possible to properly inspect the surface of the transparent body for scratches, cracks, chips, etc., and for the inspection of identification information attached to the transparent body, such as chipping, blurring, and blurring. As a result, the inspection of the transparent body can be automated, the inspection time can be shortened and the inspection accuracy can be improved, and the production efficiency and quality of the inspection object can be improved, and the production cost can be reduced.
In addition, when inspecting a curved portion of a transparent body, a wider range can be inspected at a time, and inspection efficiency can be further improved.

  Mean 2. 2. The inspection apparatus according to claim 1, wherein the projection unit is a fiber optical plate formed by bundling a plurality of optical fibers extending from the incident surface toward the emission surface.

  The end face (incident surface) of each optical fiber constituting the fiber optical plate has a predetermined light receiving angle (opening angle). For this reason, the object in the far position is projected on the exit surface of each optical fiber in a wider range than the object in the near position. As a result, the object at a distant position is projected in a blurred state on the entire exit surface of the fiber optical plate.

  Further, when light is incident on the fiber optical plate, total reflection of light is repeated in the optical fiber, so that light can be efficiently transmitted from the incident surface to the output surface with high resolution. Thereby, a clearer optical image can be obtained.

  As a result, according to the means 2, the operational effects of the means 1 can be more reliably achieved, and the inspection accuracy can be further improved.

Means 3 . The irradiation means is arranged so that light is incident from the exit surface of the projection means, and the inspection object is irradiated with light through the incident surface,
3. The inspection apparatus according to claim 1 or 2 , wherein the image pickup means picks up an optical image in which reflected light reflected by the inspection object enters the incident surface of the projection means and is projected on the output surface. .

According to the means 3 , since the irradiation means and the imaging means can be arranged close to one side of the inspection object, the inspection apparatus can be downsized. Moreover, since it can also be used for inspection of inspection objects with low transmittance such as colored valves, versatility can be improved.

Means 4 . The irradiation means is arranged on the opposite side of the projection means from the inspection object,
3. The inspection apparatus according to claim 1 or 2 , wherein the imaging means captures an optical image in which transmitted light that has passed through the transparent body is incident on an incident surface of the projection means and is projected on an exit surface.

According to the means 4 , since the contrast between the identification information to be inspected and other parts can be increased and an image in which the identification information etc. is displayed more clearly can be acquired, the inspection accuracy can be improved. Can do.

Means 5 . The inspection apparatus according to any one of means 1 to 4 , wherein the inspection object is a lamp having a bulb made of glass as the transparent body.

It is a schematic block diagram for demonstrating the test | inspection apparatus in one Embodiment. It is a front view which shows a lamp | ramp. It is a side view which shows a lamp | ramp. It is the KK sectional view taken on the line of FIG. (A) is a perspective view of a fiber optical plate, (b) is a top view of a fiber optical plate. It is a schematic diagram which shows the positional relationship of an irradiation means, a lamp | ramp, a fiber optical plate, and a CCD camera. It is a figure which shows typically the captured image of a lamp | ramp. (A), (b) is a schematic diagram for demonstrating the principle of a fiber optical plate. It is a schematic diagram which shows the positional relationship etc. of the irradiation means in another embodiment, a lamp | ramp, a fiber optical plate, and a CCD camera. (A) is a cross-sectional schematic diagram for demonstrating the fiber optical plate in another embodiment, (b) is a figure which shows typically the optical image projected on the output surface of this fiber optical plate. It is a schematic diagram which shows the positional relationship etc. of the irradiation means, lamp | ramp, and CCD camera in the past. It is a figure which shows typically the picked-up image of the conventional lamp | ramp.

  Hereinafter, an embodiment will be described with reference to the drawings. 2, 3 and 4 are diagrams showing the lamp 1 constituting the inspection object in the present embodiment. As shown in these drawings, the lamp 1 includes a bulb 2 as a transparent body made of colorless and transparent glass, and a pair of lead wires 3 partially enclosed in the bulb 2. The pair of lead wires 3 are connected within the bulb 2 by a filament 4 formed in a coil shape. The lead wire 3 and the filament 4 correspond to the non-transparent member in this embodiment. At the end portion of the valve 2, the seal portion 5 is configured by being crushed in a softened state. Further, a product number 6 (for example, “ABC-12345” or the like) as identification information is printed on the surface of the bulb 2.

  Next, an inspection apparatus for inspecting the lamp 1 will be described. FIG. 1 is a schematic configuration diagram for explaining the inspection apparatus 11. As shown in the figure, the inspection device 11 includes a chuck 12 for holding the lamp 1 and transporting it to a predetermined inspection position. The chuck 12 is operated by an actuator 13.

  In addition, the inspection apparatus 11 includes an irradiation unit 16 for irradiating the lamp 1 with predetermined light. The irradiating means 16 has a surface emitting light source and can irradiate the lamp 1 with diffused light.

  Furthermore, a fiber optical plate (hereinafter simply referred to as “FOP”) 17 as a projection unit is provided at a position opposite to the irradiation unit 16.

  As shown in FIGS. 5A and 5B, the FOP 17 in the present embodiment has a structure in which a large number of optical fibers 31 are bundled so as to be parallel to each other. Each of the optical fibers 31 has an entrance surface 33 and an exit surface 34 that are substantially orthogonal to the orientation direction (vertical direction in FIG. 5B). A curved portion 35 is formed on the incident surface 33.

  Returning to the description of FIG. 1, a CCD camera 15 as an image pickup unit for picking up an optical image of the lamp 1 displayed on the emission surface 34 is disposed on the emission surface 34 side of the FOP 17.

  Further, as shown in FIG. 1, a control device 21 is provided for driving and controlling the actuator 13, the irradiation means 16, and the like, and for performing various calculations based on the image data captured by the CCD camera 15. Yes. More specifically, the control device 21 is based on a chuck control unit 22 that controls the actuator 13 for the chuck 12, an irradiation control unit 23 that controls the irradiation unit 16, and image data captured by the CCD camera 15. An image processing unit 24 that constitutes an image processing unit capable of executing predetermined arithmetic processing and determination processing is provided.

  Next, an inspection procedure for the lamp 1 using the inspection apparatus 11 configured as described above will be described.

  At the time of inspection, the actuator 13 is driven and controlled by the chuck control unit 22 and the chuck 12 is operated, whereby the lamp 1 is conveyed to a predetermined inspection position. As a result, as shown in FIG. 6, the peripheral surface of the valve 2 and the curved surface of the curved portion 35 are brought into close proximity so that the valve 2 is fitted into the curved portion 35 of the FOP 17.

  Subsequently, the control device 21 turns on the irradiation means 16. Then, the diffused light from the irradiation means 16 is irradiated onto the lamp 1, and the transmitted light transmitted through the bulb 2 is incident on the incident surface 33 (curved portion 35) of the FOP 17. The incident light travels through each optical fiber 31 and is transmitted to the exit surface 34, and an optical image of the bulb 2 is displayed on the exit surface 34 (see FIG. 7).

  In this state, the control device 21 operates the CCD camera 15 to perform the first imaging. Here, the image data based on the first imaging is as shown in FIG. In the obtained image data, the lead wires 3 and the filaments 4 at far positions are hardly projected in a blurred state, and only the product number 6 on the surface of the valve 2 at a near position is projected relatively clearly. This is due to the following reason. That is, as shown in FIGS. 8A and 8B, the end face (incident surface 31a) of each optical fiber 31 constituting the FOP 17 has a predetermined light receiving angle (opening angle) α. For this reason, the object 41 in the far position projects a wider range β on the emission surface 31 b of each optical fiber 31 than the object 42 in the near position. As a result, the object 41 at a far position is projected in a blurred state on the entire emission surface 34 of the FOP 17.

  Subsequently, the image processing unit 24 of the control device 21 corrects the image data captured this time. The correction corrects the crushing (compression in the left-right direction) of the left and right ends of the image data caused by the shape of the curved portion 35 of the FOP 17 and adjusts the aspect ratio of the image data.

  Based on the image data obtained in this way, the printed state of the product number 6, that is, inspection of chipping, blurring, blurring, etc. is performed. For example, the quality of the product is judged based on the degree of coincidence by comparing the difference with the good product.

  The control device 21 inspects the entire periphery of the bulb 2 by repeatedly performing the series of processes described above while rotating the lamp 1 by a predetermined amount.

  As described above in detail, according to the inspection apparatus 11 of the present embodiment, the product number 6 on the surface of the valve 2 located near the FOP 17 is clearly displayed, and the lead wire 3 and the filament 4 located far away are blurred. It is possible to acquire image data of the lamp 1 in a damaged state. That is, when the lamp 1 is imaged, even if the product number 6 attached to the surface of the bulb 2 and the filament 4 inside the bulb 2 overlap with each other in the imaging direction, the filament 4 etc. is projected in a blurred state. Since the influence can be sufficiently eliminated by the filter processing by the image processing unit 24, image data from which only the product number 6 can be extracted can be acquired. Thereby, the inspection of chipping, fading, blurring, etc. of the product number 6 attached to the valve 2 can be properly performed. As a result, the inspection of the bulb 2 can be automated, the inspection time can be shortened and the inspection accuracy can be improved, and the production efficiency and quality of the lamp 1 can be improved, and the production cost can be reduced.

  In addition, since the FOP 17 can efficiently transmit light from the incident surface 33 to the exit surface 34 with high resolution, a clearer optical image can be obtained and inspection accuracy can be further improved.

  Further, a curved portion 35 is formed on the incident surface 33 of the FOP 17 in accordance with the curved shape of the side surface of the bulb 2. As a result, a wider range can be inspected at a time, and the inspection efficiency can be further improved.

  In the present embodiment, since the optical image based on the transmitted light that has passed through the bulb 2 is captured, the contrast between the product number 6 to be inspected and other parts is increased, and the product number 6 is Since an image projected more clearly can be acquired, the inspection accuracy can be improved.

  In addition, you may implement as follows, for example, without being limited to the description content of embodiment mentioned above.

  (A) In the said embodiment, although the structure which test | inspects the chip | tip of the product number 6 attached | subjected to the valve | bulb 2 which consists of colorless and transparent glass, a blur, a blur etc. is illustrated, an inspection object is not restricted to this. Absent.

  For example, it may be configured to inspect other identification information such as characters, numbers, symbols, and patterns such as product descriptions as inspection targets, or to inspect the surface of the valve 2 for scratches, cracks, chips, etc. It may be.

  Further, the bulb 2 may not be strictly transparent and may be translucent. Of course, the inspection object is not limited to the lamp 1. In short, a transparent or translucent transparent body and a non-transparent member arranged inside the transparent body can be adopted as an inspection object.

  (B) In the above-described embodiment, an optical image of the bulb 2 is picked up based on the transmitted light that is emitted from the irradiation unit 16 to the lamp 1, passes through the bulb 2, and enters the FOP 17. For example, as shown in FIG. 9, the ring illumination device 18 may be arranged on the CCD camera 15 side (the emission surface 34 side of the FOP 17) instead of the irradiation unit 16. In such a configuration, light is incident from the exit surface 34 side of the FOP 17, and the bulb 2 is irradiated with light through the incident surface 33. At this time, the ring illumination device 18 emits light obliquely with respect to the emission surface 34 of the FOP 17 at an angle at which light is not reflected from the emission surface 34 toward the CCD camera 15 (for example, an angle inclined by 60 degrees or more with respect to the imaging direction). Irradiate. Thereby, the CCD camera 15 can capture an optical image in which the reflected light reflected from the bulb 2 is incident on the incident surface 33 of the FOP 17 and projected on the exit surface 34. In this way, since the ring illumination device 18 and the CCD camera 15 can be arranged close to one side of the lamp 1, the inspection device 11 can be downsized. As a result, since it can also be used for inspection of inspection objects with low transmittance such as colored valves, versatility can be improved.

  Illumination through a polarizing filter, for example, makes the irradiated light linearly polarized light, and further provides a polarizing filter on the image pickup means and images through the polarizing filter, so that the regular reflected light from the exit surface 34 is attenuated. It becomes possible. In this case, since the influence of the regular reflection light is mitigated, it is not necessary to consider the limitation of the irradiation angle.

  (C) In the above embodiment, the fiber optical plate (FOP) 17 is employed as the projection means for projecting the optical image of the lamp 1, but the projection means is not limited to the FOP 17. For example, the light incident from the incident surface facing the object to be inspected, such as tracing paper, ground glass, etc., is transmitted to the exit surface on the other side, and an optical image of the object to be inspected is projected on the exit surface. Any projecting means can be used as long as it projects the part closer to the part farther away than the part located far away.

  For example, if tracing paper is employed, it can be deformed in accordance with the shape of the peripheral surface of the inspection object such as the lamp 1 in addition to being inexpensive. That is, it is possible to easily realize a highly versatile inspection apparatus that can inspect various kinds of inspection objects regardless of the size of the inspection object.

  Moreover, you may employ | adopt the fiber optical plate different from FOP17 concerning the said embodiment. For example, as shown in FIG. 10A, a fiber optical plate (FOP) 40 that expands in a tapered shape from the incident surface side to the output surface side may be employed. The FOP 40 has a recess 41 on the incident surface 40a side in which the lamp 1 (bulb 2) can be fitted from the head. Then, in the state where the lamp 1 is fitted in the recess 41, the surface of the bulb 2 is irradiated with the light incident from the emission surface 40b side using the ring illumination device 18 described above. Thereby, as shown in FIG.10 (b), the optical image of the perimeter of the bulb | ball 2 will be simultaneously projected on the output surface 40b. If the FOP 40 is used, the entire periphery of the bulb 2 can be inspected simultaneously without rotating the position of the lamp 1.

  DESCRIPTION OF SYMBOLS 1 ... Lamp, 2 ... Bulb, 3 ... Lead wire, 4 ... Filament, 6 ... Product number, 11 ... Inspection apparatus, 15 ... CCD camera, 16 ... Irradiation means, 17 ... Fiber optical plate, 21 ... Control apparatus, 24 ... Image processing unit, 31... Optical fiber, 33... Entrance surface, 34.

Claims (5)

Irradiation means for irradiating a predetermined light to an inspection object having a transparent or translucent transparent body and a non-transparent member arranged inside the transparent body;
Light that has entered from the incident surface facing the inspection object is transmitted to the other exit surface, and an optical image of the inspection object is displayed on the exit surface, which is more distant than the part that is far from itself. A projecting means for more clearly projecting a portion located near,
Imaging means for capturing an optical image of the inspection object projected on the projection means;
Image processing means for determining the quality of the transparent body based on the image data imaged by the imaging means ,
2. The inspection apparatus according to claim 1, wherein an incident surface of the projection unit includes a curved portion formed corresponding to the curved portion of the transparent body .   The inspection apparatus according to claim 1, wherein the projection unit is a fiber optical plate formed by bundling a plurality of optical fibers extending from the incident surface toward the emission surface. The irradiation means is arranged so that light is incident from the exit surface of the projection means, and the inspection object is irradiated with light through the incident surface,
3. The inspection according to claim 1, wherein the imaging unit captures an optical image in which reflected light reflected by the inspection object enters the incident surface of the projection unit and is projected on the exit surface. 4. apparatus. The irradiation means is arranged on the opposite side of the projection means from the inspection object,
It said imaging means, inspecting apparatus according to claim 1 or 2, characterized in that light transmitted through said transparent body to image the optical image projected on the exit surface is incident on the incident surface of the projection means . The inspection apparatus according to any one of claims 1 to 4 , wherein the inspection object is a lamp having a bulb made of glass as the transparent body.

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