JP5089958B2 - Inspection device and inspection method for tape products - Google Patents

Description

  The present invention relates to a tape inspection apparatus and method, and more particularly, a tape product inspection apparatus and method configured to accurately perform inspection of a tape product using a light transmission type roller having a built-in light source. About.

  With the development of electronic products, highly integrated packaging and wiring technology has emerged as an important issue. Tape products such as TCP, COF, and CSP are products that meet these challenges, and are widely used in packaging materials for high-integrated semiconductors and inter-circuit wiring components. It can be said that there is a trend. With the development of technology, the density of component mounting and circuit patterns has gradually increased in such tape products, and the importance of inspection of the products produced thereby has risen. However, the tape product group as described above is flexible and difficult to handle, and has properties such as transmission properties, so it is not easy to handle due to the characteristics of the material, and uniform transfer is difficult. is there.

  The structure of the optical system conventionally used for inspection of tape products consists of a device that acquires reflected images using reflected light, a device that acquires transmitted images using transmitted light, or reflected light and transmitted light. An apparatus that acquires light for inspection by applying light in a composite manner is exemplified. Here, the inspection apparatus using the transmitted light continues to have structural constraints that must be designed so that no other structure exists in the field of view of the inspection camera so that the light can be transmitted due to the characteristics of the method. An example of an inspection apparatus having such an optical structure is shown in FIG.

  As shown, the completed tape product 2 has been transported for inspection. That is, the drive rollers 7a and 7b driven by the drive devices 8a and 8b are provided so as to transport the tape product. A pair of line cameras 11 and 12 are provided for inspecting the tape product 2 provided with the circuit pattern or the electrical element 1, and the pair of line cameras 11 and 12 are provided on the surface of the tape product 2. And the back surface, that is, both sides are provided on the upper and lower portions of the tape product 2 so that they can be inspected. In front of the line cameras 11 and 12, a pair of illumination units 11a and 12a for generating light for inspection are provided. Here, the line camera can acquire video in units of lines, and based on the images obtained by continuous shooting in units of lines as described above, the tape product is inspected for errors as will be described later. Become.

  The line cameras 11 and 12 simultaneously image the front and back surfaces of the tape product 2 at different positions, and the image data thus captured is sent to the image processing inspection determination unit 16 to determine the presence or absence of an apparent defect. Will do. The result in the inspection determination unit 16 can be displayed on the display unit 17, and the control unit 18 controls the image processing inspection determination unit 16 and the drive devices 8a and 8b for transferring the tape product. Carry out.

Here, various structures are applied to accurately maintain the product within the depth of focus at the inspection position of the tape product. For example, as shown in FIG. 2a, a plurality of support rollers 4 each having a support portion designed to have a larger diameter at both end portions so that both end portions of the tape product can be supported. The tape product is transferred while supporting the bottom of both sides. Further, as shown in FIG. 2B, the upper surface of the tape product is held in close contact with the presser roller 6 and is transferred in a close contact state. In this way, by using the support roller 4 and the presser roller 6 to transfer the tape product, the tape product of the portion where the image is acquired by the line cameras 11 and 12 can be accurately adjusted within the maximum depth of focus. Try to maintain position.
However, according to such a conventional apparatus, the following disadvantages are pointed out.

  For example, although a plurality of rollers support the tape product, the tape product is not actually supported by the roller 4 at the actual inspection position. The overall height of the tape product at the position where it is made becomes uneven. That is, the center part of the tape product hangs down at the position where the image is actually captured. Further, considering the vibration generated by driving the driving devices 8a and 8b and the drooping of the tape product transferred in a predetermined length state, such a shortcoming may appear more seriously.

  If the tape product transferred by the driving rollers 7a and 7b by the driving device is applied with an external force, the product can be twisted. In this case, an accurate image can be obtained by the line camera. Since it is difficult, the reliability of the inspection is reduced.

  Moreover, since the tape product is transported in a state where it is supported only at both side ends, sagging can occur at the center portion. In this way, if the tape sag occurs, an accurate plane cannot be maintained, the height changes, and it is pointed out that an accurate image for inspection cannot be obtained. be able to.

  The present invention is intended to solve the conventional problems as described above, and has as its main object to provide an inspection apparatus capable of accurately inspecting tape products.

  In order to achieve the above object, a tape product inspection apparatus according to the present invention includes a light transmissive roller capable of transmitting light, a first illumination unit provided in the light transmissive roller, and a driving means for rotating the light transmissive roller. A guide means for guiding the tape product in surface contact with a part of the light transmission roller; and an imaging means for acquiring an inspection image of the tape product in contact with the light transmission roller. The technical gist is that it is composed.

  According to the embodiment of the imaging unit, the transmission line camera provided adjacent to the light transmission roller so as to coincide with the first illumination unit, and provided adjacent to the light transmission roller. And a second illumination unit provided outside the light transmission roller to provide reflected light to the reflection line camera.

  According to the embodiment for the guide means, the first guide roller provided so that the tape product being transferred can come into contact with the light transmission roller, and the tape product in contact with the light transmission roller is transferred to the outside. It is comprised from the 2nd guide roller provided so that it can be made.

  Here, the first guide roller is provided so that the tape product contacts the light transmitting roller at an outer peripheral edge corresponding to the horizontal central axis of the light transmitting roller, and the first guide roller is configured such that the tape product is the light transmitting roller. It is preferable to be provided so as to be separated by an outer peripheral edge corresponding to the opposite horizontal central axis.

  And according to the embodiment for the drive means, the drive motor, a pair of guide wheels that are rotated by the drive motor, provided on both side surfaces of the light transmission roller, and supports the rotation of the guide wheel, And a hollow shaft for electrical connection to the first lighting unit.

  The light transmission roller is preferably formed of quartz.

  An inspection apparatus for a tape product according to another embodiment of the present invention includes a light transmission roller capable of transmitting light, and a pair of guide wheels provided on both sides of the light transmission roller to contact the tape product with the light transmission roller therebetween. A light transmissive roller assembly, an illumination unit provided inside the light transmissive roller, a driving device for rotating the light transmissive roller, and guide means for bringing a tape product into surface contact with a part of the light transmissive roller; An image pickup means for acquiring an inspection image of the tape product in contact with the light transmission roller is a technical feature.

  According to the embodiment, the light transmission roller assembly further includes a frame provided on one side so as to support the rotation of the guide wheel, and the light transmission roller on the opposite side of the frame is opened.

  According to the tape product inspection method of the present invention, while the tape product is brought into surface contact with a part of the outer surface of the light transmissive roller rotated by the driving source, the portion in contact with the light transmissive roller is transferred. The technical feature is to acquire a video for inspection of tape products using a line camera.

  Here, the line camera is composed of a pair of cameras, the camera on one side is a line camera that acquires images using the transmitted light of the illumination provided inside the light transmission roller, and the camera on the other side is a light camera. It is comprised from the line camera which acquires an image | video using the reflected light of the illumination provided in the outer side of the transmission roller.

  And it is preferable that a tape product contacts and separates on the outer peripheral surface of the both sides corresponding to the diameter of the said light transmission roller in the horizontal direction.

  As described above, according to the present invention, the following effects can be obtained.

  According to the present invention, the tape product is transported in close contact with the surface of the light transmissive roller having a built-in light source, and an image for inspection can be captured in such a transport process. Therefore, the change in the focal length of the camera with respect to the tape product at the inspection position can be minimized, and a more accurate image for inspection can be obtained.

  And according to this invention, a tape product is comprised so that a contact may be started and spaced apart from a light transmission roller in the optimal position by a pair of guide roller provided before and behind a light transmission roller. And the tape product is conveyed in the state guided inside by the guide wheel. Therefore, the tape product can be stably transferred, and the slip or meandering that can occur during the transfer can be prevented, and the occurrence of scratches and the like due to this can be prevented.

  According to the present invention, it is possible to implement a simple structure by installing a projection type and a reflection type line camera on the outside of one light transmission roller, and minimize the environmental difference between the inspection positions of a pair of cameras. Can be

  The above points can mean that it is possible to obtain a more accurate image for inspection substantially, and that advantages such as realization of an inspection apparatus with a simple structure can be obtained.

  Next, the present invention will be described in more detail based on the embodiments shown in the drawings.

  FIG. 3 is a sectional view showing the overall configuration of the inspection apparatus according to the present invention, and FIG. 4 is a perspective view showing the light transmission roller assembly 40 of the inspection apparatus according to the present invention. As shown, the tape product inspection apparatus according to the present invention includes a light transmission roller assembly 40. The light transmissive roller assembly 40 of the present invention includes a light transmissive roller 41 formed of a material capable of transmitting a part of light, and a frame 44 that rotatably supports the light transmissive roller 41. An illumination unit 42 (not shown) is provided inside the light transmission roller 41 so that a part of the light emitted from the illumination unit 42 can pass through the light transmission roller 41. ing. Such a light transmission roller 41 is naturally formed of a material that can transmit light, and can be formed of, for example, quartz or glass.

  Guide wheels 46 formed of a metal material are provided on both side surfaces of the light transmission roller 41. Since such a guide wheel 46 is rotated by power from a driving device (not shown), the guide wheel 46 is provided so that the light transmission roller 41 can be substantially rotated. As will be described later, the tape product Ts comes into contact with the light transmission roller 41 in a certain section surface. Therefore, if the light transmission roller 41 is rotated by the driving means, the tape product Ts is transferred while rotating together with the light transmission roller 41 according to such driving force. At this time, the tape product Ts is It is transferred while being in surface contact with the light transmission roller 41 between the guide wheels 46. The guide wheel 46 substantially assists the stable transfer of the tape product Ts by guiding both end portions of the tape product Ts in surface contact with the light transmission roller 41.

  The shaft that supports the rotation of the light transmission roller 41 is preferably formed by a hollow shaft 44. That is, power can be supplied to the illumination unit 42 provided inside the light transmission roller 41 through the hollow shaft 44. The inner surface of the light transmission roller 41 is preferably processed so that the light generated by the illumination unit 42 can be diffused. That is, since it is preferable that the light emitted from the illumination unit 42 is transmitted uniformly on the outer peripheral surface of the light transmission roller 41, the light is diffused in various directions on the inner surface of the light transmission roller 41. The surface treatment is preferably performed so that the light can be diffused, and for example, the light can be diffused by a processing method such as sandblasting.

  Inspection can be performed while the tape product Ts passes through the light transmission roller 41 in a form of partial contact. In order to guide the tape product Ts to come into contact with the light transmission roller 41, a pair of guide rollers 54a and 54b are provided at the lower portions on the left and right sides of the light transmission roller 41.

  The guide roller 54a provided on the upstream side (the lower left portion of the light transmission roller with reference to the drawing) contacts the tape product Ts with the light transmission roller 41 of the light transmission roller assembly 40 in the flow of the tape product Ts. It is for guiding to let you do. In practice, for a more accurate inspection, it is preferable that the tape product Ts is transported while accurately positioned and in contact with the light transmission roller 41. Therefore, the position of the guide roller 54a must be set so that the tape product Ts can be brought into contact with the preferred position of the light transmission roller 41.

  As in the illustrated embodiment, the tape product Ts is preferably guided to the quadrant of the light transmission roller 41, which means that the tape product Ts is on the leftmost side of the horizontal diameter of the light transmission roller 41. This means that contact starts at the relevant outer peripheral edge. Such a contact start point is the most preferable point for carrying out accurate surface contact without causing accurate transfer of the tape product, i.e., slip of the tape product Ts. The contact start point of the tape product by the guide roller 54a is indicated by a drawing symbol Cs in the drawing.

  Then, in the flow of the tape product Ts, another guide roller 54b provided on the downstream side separates the tape product Ts, which has been inspected while contacting the tape product Ts with a certain section surface, from the light transmission roller 41. The function to determine the position. The point at which the tape product Ts is separated from the light transmission roller 41 is determined by the position of the guide roller 54b. In the illustrated embodiment, the guide roller 54b is provided at a position symmetrical to the guide roller 54a. Therefore, the tape product Ts can be separated from the position of the opposite quarter point of the light transmission roller 41, that is, the outer peripheral edge portion corresponding to the horizontal diameter of the light transmission roller 41.

  As described above, by determining the positions of the guide rollers 54a and 54b, the tape product Ts supplied from the front side (left side in FIG. 3) moves while performing surface contact with the light transmission roller 41 for a certain interval. After that, it should be transferred to the rear side (right side in FIG. 3). According to the present embodiment, the tape product Ts starts to contact at the quarter point of the light transmitting roller 41, that is, the outer peripheral edge corresponding to the horizontal diameter of the light transmitting roller, and is separated from the opposite outer peripheral edge. It can be seen that it is composed. In the drawing, a portion where the tape product is separated from the light transmission roller 41 is indicated by a drawing symbol Ce. Such contact and separation points of the tape product Ts prevent slippage of the tape product Ts that is in surface contact with the outer peripheral surface of the light transmission roller 41 and maintain accurate surface contact.

  As described above, a pair of cameras for inspecting the tape product is provided around the light transmission roller assembly 40 while the tape product is transferred to the light transmission roller 41 including the illumination unit 42 while being in surface contact. It has been.

  A transmission line camera 62 is provided on the right side of the drawing, that is, on the upstream side of the tape product. The transmission line camera 62 is for inspecting a defect of a circuit pattern printed on the tape product Ts. The transmission line camera 62 images the tape product using the transmitted light from the illumination unit 42 provided inside the light transmission roller 41 to obtain an image. It is preferable that the transmission line camera is provided or adjusted so as to be in a straight line with the illumination unit 42 so that the transmitted light from the illumination unit 42 can be used most effectively.

  The transmission line camera 62 is supported by a first support shaft 64 so as to be rotatable in a certain section in the direction of arrow A, and can be fixed by a fixing means such as a bolt at a desired point. A first support shaft 64 that supports the transmission line camera 62 is rotatably supported by a support block 68. The support block 68 is supported by a second support shaft 66 such that the support block 68 can be rotated in a certain section, and can be fixed using a fixing means such as a bolt at a desired point.

  The first support shaft 64 and the second support shaft 66 are substantially orthogonal axes. Therefore, the support block 68 can be adjusted to rotate about the second support shaft 66, and the transmission line camera 62 can be adjusted to rotate about the first support shaft 64 with respect to the support block 68. Accordingly, the angle of the transmission line camera 62 can be adjusted with respect to two orthogonal axes. Therefore, by adjusting the angle of the camera 62 using these two axes, the line camera 62 can be accurately focused on the surface of the light transmission roller.

  The lower part of the transmission line camera 62 on the downstream side (the lower right part of the light transmission roller with reference to the drawing) is inspected for surface defects of the tape product, such as scratches, contamination of foreign substances, SR (solid register) inspection. A reflection line camera 72 is provided for performing the above. An illumination unit 79 is provided in front of the reflection line camera 72, that is, between the reflection line camera 72 and the tape product Ts. The illumination unit 79 irradiates light toward the tape product Ts. The reflection line camera 72 can inspect whether or not there is a defect by acquiring an image of the tape product Ts transferred from the lower part using the light from the illumination unit 79 as reflected light. The light transmission roller transmits a part of the light in the same manner as described above, but a part of the light from the illumination unit 79 provided on the upper side of the light transmission roller is reflected, and such a reflection is performed. Using the light, the reflection line camera 72 can acquire an image of a portion of the tape product.

The reflection line camera 72 is also configured to be adjustable with respect to two orthogonal axes, the same as the transmission line camera 62. That is, the reflection line camera 72 is rotatable about the first support shaft 74 supported by the support block 78, and can be fixed by a fixing means such as a bolt in an adjusted state. The support block 78 is rotatable about the second support shaft 76 and can be fixed by a fixing means such as a bolt in a state adjusted to a desired position. Accordingly, the reflection line camera 72 can also be rotated with respect to two orthogonal axes in the same manner as the transmission line camera 62, and can be fixed at an adjusted position. It is possible to acquire images using light efficiently.
Support rollers 52a and 52b are provided on the upstream side of the guide roller 54a and on the downstream side of the guide roller 54b, respectively. The support rollers 52a and 52b are disposed at higher positions than the guide rollers 54a and 54b. The support roller 52a supports the tape product Ts with the guide roller 54a, and guides the tape product Ts to the light transmission roller 44 together with the guide roller 54a. The support roller 52b supports the tape product Ts between the guide roller 54b and guides the tape product Ts to the light transmission roller 44 together with the guide roller 54b.
As shown in FIG. 3, press rollers 56 a and 56 b for pressing the tape product Ts against the light transmission roller 41 may be provided on the upstream side and / or the downstream side of the light transmission roller 41.

  Next, the operation of the inspection apparatus having the above configuration will be described.

  The completed tape product Ts is guided through a support roller 52a and a guide roller 54a for inspection. The driving force for transferring the tape product Ts is due to the rotation of the light transmission roller 41 as described above. The contact start point Cs of the tape product Ts that contacts the light transmission roller 41 via the guide roller 54a is a position corresponding to the leftmost side of the horizontal center line of the light transmission roller as described above.

  Then, if the light transmission roller 41 is rotated by a guide wheel 46 interlocked with a driving means (not shown), the tape product Ts in contact with the light transmission roller 41 is also transferred. While the tape product Ts is transferred while the light transmission roller 41 rotates, the transmission line camera 62 and the reflection line camera 72 can obtain an image of the product, and whether or not a defect is detected based on the image. Can perform inspections against The line cameras 62 and 72 take an image of the tape product in contact with the light transmission roller 41, but obtain continuous images on a line basis.

  Since the image of the tape product Ts is obtained in surface contact with the light transmission roller 41, the distance between the camera and the tape product is constant, and the change in focal length can be minimized. . Further, the configuration of the guide rollers 54a and 54b as described above determines the contact start and separation point of the light transmission roller 41, and the configuration of the guide wheel 46 enables the tape product Ts to run most stably. In this case, the tape product can be prevented from slipping or meandering during transfer.

  A circuit defect such as a short circuit and a surface defect can be simultaneously inspected based on images acquired through the transmission line camera 62 and the reflection line camera 72 while passing through the light transmission roller 41. .

  Next, a light transmission roller assembly 80 according to another embodiment illustrated in FIG. 5 will be described. The light transmission roller assembly 80 according to the present embodiment includes a light transmission roller 82 opened on one side. The illumination unit is provided inside the light transmission roller 82 in the same manner as in the above embodiment, and the illumination unit is not shown for convenience of illustration. By opening one side of the light transmission roller 82, it is easy to install and set the internal illumination unit.

  A pair of guide wheels 84 are provided on both sides of the light transmission roller 82 as in the above-described embodiment. In this embodiment, a guide bearing 86 is provided on one side portion of the guide wheel 84. In the drawing, the guide wheel 86 cannot see the guide wheel on one side.

  The guide wheel 84 is rotatably supported by a frame 88. A drive motor (not shown) is provided on one side of the frame 88, and the guide wheel 84 is rotated. The tape product Ts to be inspected is transferred by the rotation of the light transmission roller 82.

  In the present embodiment, the configuration excluding the light transmission roller assembly 80 described above is exactly the same as that of the above-described embodiment, and therefore, repeated description and operation are omitted.

  As described above, according to the present invention, an apparatus capable of acquiring an image using an inspection camera while transporting a tape product around at least a part of a light transmission roller 41 provided with a light source. Is a basic technical subject. Within the scope of the basic technical mapping of the present invention, many other variations are possible to those of ordinary skill in the art, and the present invention includes the appended claims. Obviously, it should be interpreted on the basis of

It is an illustration figure of the conventional tape product inspection apparatus. It is an illustration perspective view of the support roller for supporting the conventional tape product. It is a front illustration figure which shows the transfer state of the conventional tape product. It is a section illustration figure showing the tape product inspection device of the present invention. It is an example perspective view of the light transmission roller assembly of this invention. FIG. 6 is an exemplary perspective view of a light transmission roller assembly according to another embodiment of the present invention.

Explanation of symbols

2, Ts Tape product 4, 52a Support roller 6 Presser roller 7a, 7b Drive roller 8a, 8b Drive device 11, 12 Line camera 11a, 12a, 42, 79 Illumination unit 16 Image processing inspection determination unit 17 Display unit 18 Control unit 40 , 80 Light transmission roller assembly 41, 82 Light transmission roller 44, 88 Frame 46, 84 Guide wheel 62 Transmission line camera 64, 74 First support shaft 66, 76 Second support shaft 72 Reflection line camera 68, 78 Support block

Claims (10)

An inspection device for inspecting a tape product,
A light transmissive roller capable of transmitting light;
A first illumination unit provided inside the light transmission roller;
Driving means for rotating the light transmission roller;
Guiding means for guiding the tape product in surface contact with a part of the light transmission roller;
Imaging means for acquiring an image for inspection of a tape product in contact with the light transmission roller ,
The imaging means includes
A transmission line camera for imaging a tape product using the transmitted light in the first illumination unit;
A line camera for reflection provided adjacent to the light transmission roller;
A second illumination unit provided outside the light transmission roller to provide reflected light to the line camera for reflection,
The transmission line camera can be fixed at a position rotated and adjusted by a first support shaft supported by a support block, and the support block can be rotated by a second support shaft orthogonal to the first support shaft. An inspection apparatus for a tape product, wherein the inspection apparatus is fixed in a movable and adjusted position . The guiding means includes
A first guide roller provided so that a tape product to be transferred can come into contact with the light transmission roller;
A second guide roller provided so that the tape product to be transferred while being in contact with the light transmission roller can be separated from the light transmission roller;
The tape product inspection device according to claim 1 , wherein the tape product inspection device comprises: The first guide roller is provided so that the tape product contacts the light transmitting roller at an outer peripheral edge corresponding to the horizontal diameter of the light transmitting roller, and the first guide roller is provided on the opposite side of the light transmitting roller. 3. The tape product inspection device according to claim 2 , wherein the tape product inspection device is provided so as to be separated by an outer peripheral edge corresponding to a horizontal diameter. The driving means includes
A drive motor;
A pair of guide wheels that are rotated by the drive motor and provided on both side surfaces of the light transmission roller;
A hollow shaft for supporting rotation of the guide wheel and for electrical connection to the first lighting unit;
The tape product inspection apparatus according to claim 2 , comprising: 5. The inspection device for a tape product according to claim 4, wherein the guide wheel guides both ends of the tape product. 3. The tape product inspection apparatus according to claim 2, wherein an inner surface of the light transmission roller is surface-treated so that light from the first illumination unit can be diffused. The light transmission roller inspection apparatus tape product according to claim 1, characterized in that it is molded of quartz. The reflection line camera is provided so as to be fixed at a position rotated and adjusted by a first support shaft supported by a support block, and the support block is rotated by a second support shaft orthogonal to the first support shaft. 2. The tape product inspection device according to claim 1 , wherein the tape product inspection device is fixed in a movable and adjusted position. While the tape product is brought into surface contact with a part of the outer surface of the light transmission roller that is rotated by the driving source and transferred, an image for inspection of the tape product in contact with the light transmission roller is obtained using a line camera. A tape product inspection method ,
The line camera is composed of a pair of cameras, the camera on one side is a transmission line camera that acquires images using the transmitted light of the illumination provided inside the light transmission roller, and the camera on the other side is a light camera. A line camera for reflection that captures an image using reflected light of illumination provided outside the transmission roller;
The transmission line camera can be fixed at a position rotated and adjusted by a first support shaft supported by a support block, and the support block can be rotated by a second support shaft orthogonal to the first support shaft. A tape product inspection method, wherein the tape product is fixed in a movable and adjusted position. 10. The inspection method for a tape product according to claim 9, wherein the tape product is contacted and separated at outer peripheral surfaces on both sides corresponding to a horizontal diameter of the light transmission roller.

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