JP2007188929A - Tape joint detection device and tape joint detection method - Google Patents

Abstract

An object of the present invention is to provide a tape joint detection device and a tape joint detection method that enable highly stable sensing in detection of a tape joint.
Detecting the presence of a light-shielding tape (31) mounted by sealing at least one of the feed holes (21a) at a joining portion of a carrier tape (21) having feed holes (21a) formed at equal pitches in the tape feed direction. Detects the joining portion of the carrier tape 21 and calculates the light shielding length when the light shielding state is detected by using the transmission type sensors 40a and 40b that detect the light shielding state using the path of the feed hole 21a by the tape feeding as a sensing location. And calculating means 24a, 42 for detecting the presence of the light shielding tape 31 at the sensing location when the light shielding length exceeds a predetermined threshold.
[Selection] Figure 4

Description

  The present invention relates to a tape joint detection device and an electronic component supply device that detect a joint portion between carrier tapes in which electronic components are stored.

A tape feeder is known as a device that supplies electronic components using a tape containing electronic components, and the electronic components are supplied to a pickup position by a transfer head provided in the electronic component mounting apparatus by pitch feeding the tape. ing. Since there is a limit to the number of electronic components that can be stored in a single lot, the tape is usually spliced together by a method called splicing, enabling continuous supply of electronic components and improving mounting efficiency. I am trying. By the way, when a defect or the like occurs in an electronic device or the like including an electronic component mounted in the electronic component mounting apparatus, tracing may be performed for a lot that includes the electronic component. For this reason, in the process of supplying electronic components in the tape feeder, there is known an apparatus that detects a splicing portion of the tape by splicing and identifies which electronic component is stored in which tape (see Patent Document 1). ). In this apparatus, the joint portion is detected by detecting a notch formed in the joint portion of the tape with a transmission type sensor.
Japanese Patent Laid-Open No. 10-341096

  However, if only the notch formed in a part of the tape is detected by the sensor, the stability of the sensing is likely to be impaired due to the twisting of the tape or the malfunction of the sensor, and there is a problem in the reliability of the detection result. It was.

  Therefore, an object of the present invention is to provide a tape joint detection device and a tape joint detection method that enable highly stable sensing in detection of a tape joint.

  The invention according to claim 1 detects the presence of a light-shielding tape that is mounted by sealing at least one of the feed holes at a joint portion of a carrier tape having feed holes formed at equal pitches in the tape feed direction. A carrier tape joint detection device for detecting a joint portion of the carrier tape by a transmission sensor for detecting a light-shielding state using a path of the feed hole by tape feeding as a sensing location, and the transmission sensor Calculating means for calculating a light shielding length when a light shielding state is detected, and that the light shielding tape is present at the sensing location when the light shielding length calculated by the computing means exceeds a predetermined threshold. Detecting means for detecting.

  The invention according to claim 2 is the invention according to claim 1, wherein the length of the light-shielding tape in the tape feed direction is longer than the length of two pitches of the feed holes, and the threshold value of the feed holes is The length is set to 2 pitches.

According to a third aspect of the present invention, the presence or absence of a light-shielding tape installed by sealing at least one of the feed holes at a joining portion of a carrier tape having feed holes formed at equal pitches in the tape feed direction is detected. A tape joining part detection method for detecting a joining part of the carrier tape by detecting a light shielding state using a path of the feed hole by tape feeding as a sensing location, and a light shielding state in the sensing process. A calculation step of calculating a light shielding length when the light is detected, and a detection step of detecting the presence of the light shielding tape at the sensing location when the light shielding length calculated in the calculation step exceeds a predetermined threshold Including.

  According to the present invention, the light shielding length is calculated from the light shielding state detected by the presence of the light shielding tape passing through the sensing location, and the light shielding tape is present at the sensing location when the light shielding length exceeds a predetermined threshold. Is detected, the sensing is stabilized and the reliability of the detection result is improved.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the configuration of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a side view showing the configuration of a tape feeder according to an embodiment of the present invention, and FIGS. ) Is an explanatory diagram of tape splicing according to an embodiment of the present invention, FIG. 4 (a) is a plan view showing the configuration of a tape splicing part detection device according to an embodiment of the present invention, and FIG. The side view which shows the structure of the tape joining part detection apparatus of one Embodiment of invention, FIG. 5 is explanatory drawing explaining the relationship between the sensing location and light-shielding length in the carrier tape of one Embodiment of this invention, FIG. These are the flowcharts which show the tape joining part detection method of one embodiment of this invention.

  First, the overall configuration of an electronic component mounting apparatus according to an embodiment of the present invention will be described. In FIG. 1, a substrate transport device 2 that transports a substrate is arranged in a row in the X direction substantially at the center on the base 1, and the substrate 3 is transported in the X direction via the substrate transport device 2. Is done. In the present invention, the conveyance direction of the substrate 3 is the X direction, and the direction orthogonal to the substrate 3 in the horizontal plane is the Y direction.

  A plurality of tape feeders 4 which are electronic component supply devices are arranged in parallel on both sides in the Y direction of the substrate transport device 2. A plurality of electronic components are accommodated in the tape feeder 4, and these electronic components are sequentially supplied to a supply port 5 serving as a pickup position by a nozzle mounted on a transfer head 8 described later. By accommodating different types of electronic components in each tape feeder 4, a plurality of types of electronic components can be mounted on one substrate 3.

  A pair of Y tables 6 are disposed at both ends in the X direction of the base 1, and an X table 7 is constructed on the pair of Y tables 6. A transfer head 8 is mounted on the X table 7. The Y table 6 and the X table 7 are moving means for moving the transfer head 8 in an area including the supply port 5 of the tape feeder 4 and the substrate 3.

  A plurality of nozzle units 9 are mounted on the transfer head 8. A plurality of nozzles (not shown) are mounted at the lower end of each nozzle unit 9, and each nozzle is configured to be movable up and down in the Z direction and rotated in the θ direction (around the Z axis). In addition, each nozzle is equipped with an intake / exhaust mechanism (not shown). When picking up electronic components, the nozzles are vacuum-sucked to hold the electronic components, and when mounting electronic components, The so-called vacuum break that releases the electronic component is performed by exhausting the air.

  Further, the transfer head 8 is provided with a camera 10 that is an imaging means for imaging an electronic component supplied to the supply port 5 of the tape feeder 4, and the camera 10 moves integrally with the nozzle. An image obtained by capturing the supply port 5 by the camera 10 is subjected to image processing to recognize the position and orientation of the electronic component, and the electronic component is picked up by the nozzle aligned with the electronic component based on the recognition result.

Between the substrate transport device 2 and the tape feeder 4, a camera 11 that is an imaging means for imaging an electronic component sucked by the nozzle is disposed. By processing the image captured by the camera 11, the position and orientation of the electronic component sucked by the nozzle are recognized, and based on the recognition result, the electronic part is placed at a predetermined mounting position on the substrate 3 with a predetermined mounting posture. Is implemented.

  A nozzle stocker 13 in which a plurality of types of nozzles 12 are housed is disposed on the side of the camera 11. Each nozzle 12 is prepared in accordance with the type of electronic component stored in the tape feeder 4. The nozzle 12 is detachable with respect to the nozzle unit 9, and the transfer head 8 is positioned above the nozzle stocker 13 and can be exchanged with a different type of nozzle by raising and lowering the nozzle. Can also be replaced manually.

  Next, the configuration of the tape feeder 4 will be described. The tape feeder 4 has a function of feeding the carrier tape 21 inside the outer frame 20 and pitch-feeding the electronic components stored in the carrier tape 21 to the supply port 5. A tape feeding mechanism 22 is disposed at the tip of the outer frame 20. The tape feeding mechanism 22 functions as a tape feeding means that engages with feeding holes 21a (see FIG. 4) provided in the carrier tape 21 at an equal pitch and feeds the tape, and in the feeding direction of the carrier tape 21 at an equal pitch. A sprocket 23 having an engaging portion 23a (see FIG. 4) that engages with the formed feed hole 21a is formed on the outer periphery, a motor 24 that is a rotation driving means of the sprocket 23, and a rotation driving amount of the motor 24 is controlled. The control unit 25 is configured. The control unit 25 stores various data such as control programs and electronic component storage pitches in the storage area.

  When the control unit 25 controls the motor 24 to rotate intermittently, the sprocket 23 performs index rotation, the carrier tape 21 is pitch-fed, and the electronic components stored in the carrier tape 21 at an equal pitch are sequentially supplied to the supply port 5. To be supplied. The supply port 5 is opened to a tape guide 26 that is attached to the upper portion of the outer frame 20 and guides the feeding of the carrier tape 21. The tape guide 26 has a function of turning back the cover tape 21b peeled off from the surface of the carrier tape 21, and the cover tape 21b is peeled off from the carrier tape 21 by the cover tape peeling mechanism 27, and the exposed electronic component is supplied to the supply port. 5 is supplied. The electronic component supplied to the supply port 5 is picked up by the nozzle 12 positioned above the supply port 5.

  The carrier tape 21 is stored in a state wound around a reel 28 disposed outside the outer frame 20, and is drawn into the outer frame 2 from the rear end portion of the outer frame 20 by the tape feeding mechanism 22. The pitch is fed to the tip. When all of the carrier tape 21 wound on the reel 28 is consumed during the supply process of the electronic component, the supply operation of the electronic component is interrupted. Therefore, another carrier in which the same kind of electronic component is stored at the end of the carrier tape 21. Tape splicing that joins the tips of the tape 21A is performed to enable continuous supply of electronic components.

  Next, tape splicing will be described. In FIG. 3A, pockets 21c are formed in carrier tapes 21 and 21A at equal pitches in the tape feeding direction, and electronic components P are accommodated in the pockets 21c. After the electronic component P is stored in the pocket 21c, as shown in FIG. 3B, the cover carrier tape 21b is stuck on the upper surfaces of the carrier tapes 21 and 21A to cover the pocket 21c. Feed holes 21a are formed at equal pitches in the tape feed direction on the sides of the carrier tapes 21 and 21A. Tape splicing is performed by adhering the splice tapes 30 and 31 to both the upper and lower surfaces at a position sandwiching the joint portion J between the end of the carrier tape 21 configured as described above and the tip of the carrier tape 21A. Since the splice tape 31 is attached at a position covering the feed hole 21a, a slit 31a is formed in the tape feed direction, and the engagement portion 23a of the sprocket 23 is covered by the splice tape 31 via the slit 31a. It engages with the hole 21a.

  Next, a description will be given of a tape joint detection device that detects a joint of the spliced carrier tapes 21 and 21A. 4A and 4B, a tape guide 26 that guides the feeding of the carrier tape 21 is mounted on the upper portion of the outer frame 20 of the tape feeder 4. As described above, when the motor 24 is intermittently rotated by the control unit 25 and the sprocket 23 is index-rotated in the direction of arrow a, the carrier tape 21 is pitch-fed in the direction of arrow b, and the electronic components P stored at an equal pitch are It is sequentially supplied to the supply port 5 in an exposed state.

  A transmissive sensor is disposed upstream of the tape feeding direction (arrow b). The transmission type sensor is configured by vertically arranging a light projector 40a and a light receiver 40b across a side portion of the carrier tape 21 where the feed hole 21a is formed, so that light is emitted from the light projector 40a to the light receiver 40b. It has become. The tape guide 26 is formed with a light passage hole 26a through which light emitted from the projector 40a passes. The light reception state in the light receiver 40b is detected by the detection unit 41 as a light shielding state (light shielding ON) or a light transmitting state (light shielding OFF). The transmission type sensor uses the path of the feed hole 21a by tape feeding as a sensing location, and when the feed hole 21a passes through the sensing location, the light emitted from the projector 40a passes through the feed hole 21a and receives the light. The light is received by 40b and is detected by the detector 41 as being light-shielded OFF. On the other hand, as shown in FIG. 4B, when the tape joining portion J to which the splice tape 31 is attached passes through the sensing location, the light emitted from the projector 40 a is blocked by the splice tape 31. Thus, the light receiving device 40b does not receive the light, and the detection unit 41 detects that the light shielding is ON.

  When the light-blocking ON is detected by the detection unit 41, the calculation unit 42 starts counting pulses of the encoder 24a of the motor 24 and calculates the light-shielding length. The calculation unit 42 calculates the light shielding length only when the light shielding is ON. When the light shielding is turned OFF, the calculation is stopped and the light shielding length being calculated is reset. For example, if the carrier tapes 21 and 21A are made of a light-shielding material, the light shielding ON / OFF alternates every time the feed hole 21a passes through the sensing location in a normal location where the splice tape 31 is not attached. The distance between the adjacent feed holes 21a is repeatedly calculated as the light shielding length. Further, if the carrier tapes 21 and 21A are made of a translucent material, the light shielding is always turned off and the light shielding length is not calculated at a normal portion where the splice tape 31 is not attached.

  FIG. 5 shows the relationship between the sensing location on the carrier tape 21 and the light shielding length. When the feed hole 21a passes through the sensing portion by tape feeding, the light shielding is turned off, so the light shielding length is zero. On the other hand, since the light shielding is ON when the adjacent feed holes 21a pass the sensing location, the computation of the light shielding length is started, and the distance d1 between the adjacent feed holes 21a is computed as the light shielding length s1. . When the next feed hole 21a reaches the sensing location, the light shielding is turned off. Therefore, the calculation is interrupted and the light shielding length is reset to zero.

  The splice tape 31 is a light shielding tape having a light transmittance that is at least not detected by the light receiver 40b. When the splice tape 31 passes through the sensing location, the detection unit 41 detects that the light shielding is ON. It has become so. In addition, since the splice tape 31 is adhered and sealed with at least one of the feed holes 21a, a light shielding length greater than the light shielding length s1 is calculated when the splice tape 31 passes the sensing location. . Therefore, a light shielding length that is larger than the light shielding length s1 and smaller than the light shielding length corresponding to the length of the splice tape 31 in the tape feeding direction is set in a storage area of the control unit 25 in advance as a predetermined threshold, that is, a light shielding tape presence / absence determination value th. The light shielding length exceeding the light shielding tape presence / absence determination value th is calculated when the sensing tape 31 passes the sensing location.

  Thus, when the splice tape 31 does not pass the sensing location, the light shielding length s1 that does not exceed the light shielding tape presence / absence determination value th is repeatedly calculated, and when the splice tape 31 passes the sensing location, the light shielding is performed. Since the light shielding length exceeding the tape presence / absence determination value th is calculated, by determining whether the light shielding length calculated by the calculation unit 42 exceeds the light shielding tape presence / absence determination value th, Whether or not the splice tape 31 is present can be detected.

  FIG. 5 shows the relationship between the sensing location and the light shielding length when the carrier tape 21 is made of a light shielding material. If the carrier tape 21 is made of a light transmissive material, the splice tape is used. Since the light shielding OFF is always performed at a normal location where 31 is not attached, the light shielding length s1 is not repeatedly calculated. In this case, the light shielding is turned on for the first time when the splice tape 31 passes the sensing portion, and the light shielding length is calculated.

  As described above, in the tape joining part detection device according to the present embodiment, the light shielding length is calculated from the light shielding state continuously detected by the presence of the splice tape 31 that is the light shielding tape passing through the sensing location, and the light shielding is performed. When the length exceeds a predetermined threshold, it is detected that there is a light-shielding tape at the sensing location, and the joining portion of the carrier tape is detected. For example, the presence of a notch formed in a part of the carrier tape is detected. Sensing is stabilized and reliability of the detection result is improved as compared with a conventional device that detects the tape joint by detecting.

  By the way, if there is a problem such as foreign matter clogging in the feed hole 21a (hatched feed hole in the figure), the light shielding ON may be detected by the foreign matter or the like, and the light shielding may not be turned off even if it passes through the sensing location. In this case, since zero reset is not performed, the distance d2 between every two adjacent feed holes 21a is calculated as the light shielding length s2. For this reason, in the present embodiment, the light shielding length corresponding to the distance d3 corresponding to two pitches of the feed holes 21a is set as the light shielding tape presence / absence judgment value th with a margin from the distance d2 between the alternate feed holes 21a. is doing. The length of the splice tape 31 in the tape feeding direction is made larger than the distance d3 corresponding to two pitches of the feeding holes 21a. Accordingly, it is possible to avoid a problem that the splice tape 31 is erroneously detected even when a foreign matter or the like is clogged in one of the feed holes 21a regardless of the material of the carrier tape 21.

  In FIG. 4B, the calculation unit 42 functions as a calculation unit that calculates the light blocking length when a light blocking state is detected by the transmissive sensor (the projector 40a, the light receiver 40b, and the detection unit 41). When the light-shielded length exceeds a predetermined threshold value (light-shielding tape presence / absence judgment value th), it functions as a detecting means for detecting the presence of the light-shielding tape at the sensing location.

  In addition, among the various data stored in the storage area of the control unit 25, the calculation unit 42 is a distance between the sensing location by the transmission sensor and the supply port 5, the electronic component storage pitch, a predetermined threshold, and the joint unit J. The timing at which the carrier tape 21 that stores the electronic components supplied to the supply port 5 is switched to the carrier tape 21A is calculated from the data of the position where the splice tape 31 is attached. This calculation result is transmitted to the host system by the communication unit 43. As a host system, for example, in a mounting apparatus, by storing which electronic component stored in which carrier tape was mounted on which substrate, the electronic component mounted on the substrate in which the problem occurred was stored Tracing to identify other boards on which electronic components housed in the same carrier tape are mounted is possible, and measures such as recovering or discarding these boards as boards that are highly likely to fail Can take.

Next, a tape joint detection method according to an embodiment of the present invention will be described. In this detection method, the carrier tape is detected by detecting a light-shielding tape that is installed by sealing at least one of the feed holes at a joint portion of the carrier tape in which feed holes are formed at equal pitches in the tape feed direction. This is a method for detecting a joint portion, and can be applied to the above-described tape joint detection device.

  FIG. 6 is a flowchart showing a splice tape detection procedure in the tape joint detection device. First, when the motor 24 is driven to rotate intermittently, the sprocket 23 is index-rotated, and the pitch feeding of the carrier tape 21 is started (ST1). Next, a detection step of detecting a light shielding state is performed using the path of the feed hole 21a of the carrier tape 21 as a sensing location. In the detection step, the light-blocking state of the part passing through the sensing part is detected by the transmission type sensor, and the light-blocking ON is detected when the space between the adjacent feed holes 21a reaches the sensing part (ST2). Next, a calculation step of calculating a light blocking length when a light blocking state is detected in the detection step is executed. In the calculation step, the pulse of the encoder 24a of the motor 24 is counted from the time when the light blocking ON is detected, and the light blocking length is calculated (ST3). The calculation of the light shielding length is continued until the light shielding OFF is detected, and when the light shielding length exceeds the light shielding tape presence / absence determination value th, it is detected that the splice tape 31 is present at the sensing location (ST4). . On the other hand, if light shielding OFF is detected without the light shielding length exceeding a predetermined threshold value, the light shielding length calculated up to that point is reset to zero (ST5). Resume length calculation. In ST4, when it is detected that the splice tape 31 is present at the sensing location, the timing at which the carrier tape that stores the electronic component is switched is calculated and notified to the host system (ST6). The shading length is not calculated for the location (ST7).

  If the carrier tape 21 is made of a translucent material, the light shielding is turned on only when the splice tape 31 reaches the sensing location, so the steps ST2 and ST5 are omitted. In addition, the light shielding in the present invention is not limited to complete light shielding, and a light transmittance that allows the light shielding ON / OFF to be clearly detected in a transmissive sensor is acceptable. Further, it may include light shielding at a specific wavelength, and detect light ON / OFF at a specific wavelength using a transmission sensor corresponding to the light shielding.

  According to the tape joint detection device and the tape joint detection method of the present invention, the light shielding length is calculated from the light shielding state detected by the presence of the light shielding tape passing through the sensing location, and the light shielding length is a predetermined threshold value. Since the presence of light-shielding tape is detected at the sensing location and the joining portion of the carrier tape is detected, the sensing tape is stable and the reliability of the detection result is improved. This is useful in the mounting field in which electronic components are supplied using

The top view which shows the structure of the electronic component mounting apparatus of one embodiment of this invention The side view which shows the structure of the tape feeder of one embodiment of this invention (A), (b) Explanatory drawing of tape splicing of one embodiment of the present invention (A) The top view which shows the structure of the tape joining part detection apparatus of one embodiment of this invention, (b) The side view which shows the structure of the tape joining part detection apparatus of one embodiment of this invention Explanatory drawing explaining the relationship between the sensing location and light-shielding length in the carrier tape of one embodiment of this invention The flowchart which shows the tape joining part detection method of one embodiment of this invention

Explanation of symbols

21, 21A Carrier tape 21a Feed hole 31 Splice tape 40a Light projector 40b Light receiver 41 Detection unit 42 Calculation unit th Tape presence / absence determination value J Joint portion

Claims (3)

The joining of the carrier tapes by detecting the presence of a light-shielding tape that is installed by sealing at least one of the feeding holes in a joining part of the carrier tape having feeding holes formed at equal pitches in the tape feeding direction. A carrier tape joint detection device for detecting a part,
A transmission type sensor that detects a light blocking state using the path of the feed hole by tape feeding as a sensing location, a calculation unit that calculates a light blocking length when the light blocking state is detected by the transmission type sensor, and a calculation by the calculation unit And a detecting means for detecting the presence of the light-shielding tape at the sensing location when the light-shielding length exceeds a predetermined threshold. The length of the light shielding tape in the tape feeding direction is longer than the length of two pitches of the feeding holes,
2. The tape joint detection device according to claim 1, wherein the threshold is set to a length corresponding to two pitches of the feed hole. The connection of the carrier tape is detected by detecting the presence or absence of a light-shielding tape that is installed by sealing at least one of the supply holes at a joining portion of the carrier tape having feed holes formed at equal pitches in the tape feed direction. A tape joint detection method for detecting joints,
A detection step of detecting a light blocking state using the path of the feed hole by tape feeding as a sensing location, a calculation step of calculating a light blocking length when a light blocking state is detected in the detection step, and a calculation step calculated in the calculation step And a detection step of detecting the presence of the light shielding tape at the sensing location when the light shielding length exceeds a predetermined threshold.

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