JP2014138129A - Electronic component mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic component mounting device which is capable of discriminating the posture of an electronic component by capturing an image transmitted through the electronic component held by an article holder as parallel light, even when the electronic component held by the article holder is irradiated with diffused light.SOLUTION: When an LED 12 is turned on, light from the LED 12 is guided downward while being diffused by a light guide body 13 by a light-shielding body 14. In other words, the light diffused by the light guide body 13 is guided downward while being reflected by the light-shielding body 14 and is reflected upward by the painting 15 as the light-shielding body of the lower surface of the light guide body 13. As a result, the diffused light is emitted to the outside in all directions of 360 degrees from the peripheral side surface of the lower half part of the light guide body 13 not covered with the light-shielding body 14. An electronic component D sucked and held by a suction nozzle 5 is irradiated with the diffused light and the light transmitted through the electronic component D becomes the parallel light by three telecentric lenses 21 and is captured by an imaging element 22.

Description

  According to the present invention, a mounting head having a plurality of component holders with a predetermined interval at the periphery is rotatably supported by a mounting head body, and an electronic component is taken out from the component supply device by the component holder, The present invention relates to an electronic component mounting apparatus to be mounted on top.

  Conventionally, as disclosed in, for example, Patent Document 1, after the electronic component suction operation, the central portion of the mounting head is used to detect whether or not the electronic component is suctioned by the suction nozzle and to detect a suction posture failure. A line sensor unit comprising: a light emitting unit provided on the light emitting unit; and a light receiving unit that receives light from the light emitting unit when the electronic component sucked and held by the suction nozzle selected between the light emitting units is positioned. The providing technique is disclosed.

  In addition, the electronic component held by the article holder such as the suction nozzle is irradiated with parallel light from the horizontal direction, and this is viewed by the component holding posture recognition camera arranged behind the holder as viewed from the light source. Thus, it is conceivable to perform posture detection as described above.

JP 2003-332791 A

  However, as described above, a structure that irradiates an electronic component held by an article holder with parallel light has a problem of high cost and is not suitable for practical use.

  Therefore, the present invention captures a transmission image of the electronic component held by the article holder as parallel light even when the electronic component held by the article holder is irradiated with diffused light, and the attitude of the electronic component It is an object of the present invention to provide an electronic component mounting apparatus capable of discriminating the above.

Therefore, according to the first aspect of the present invention, a mounting head having a plurality of component holders with a predetermined interval at the periphery is rotatably supported by the mounting head body, and an electronic component is received from the component supply device by the component holder. An electronic component mounting device that is taken out and mounted on a substrate,
A light source provided in the mounting head; and a light guide disposed below the light source and guiding the light from the light source while diffusing the light. The light diffused by the light guide is transmitted to the mounting head. An illuminating device for irradiating an electronic component held by the component holder
A component holding posture recognition camera is provided that irradiates an electronic component held by the component holder with the light diffused by the light guide and takes a parallel light through a telecentric lens to capture a transmitted image. To do.

According to a second aspect of the present invention, a mounting head having a plurality of component holders with a predetermined interval at the periphery is rotatably supported by the mounting head body, and an electronic component is taken out from the component supply device by the component holder. An electronic component mounting apparatus mounted on a substrate,
A light source provided in the mounting head; and a round bar-shaped light guide disposed below the light source and covered with a light-shielding body to guide light downward while diffusing the light from the light source. An illumination device that irradiates an electronic component held by the component holder included in the mounting head with light diffused by a body;
A component holding posture recognition camera is provided that irradiates an electronic component held by the component holder with the light diffused by the light guide and takes a parallel light through a telecentric lens to capture a transmitted image. To do.

  According to a third invention, in the first or second invention, a light-shielding body is provided to prevent light diffused on the lower surface of the light guide body from leaking downward.

  The present invention can determine the posture of the electronic component by capturing a transmission image of the electronic component held by the article holder as parallel light even when the electronic component held by the article holder is irradiated with diffused light. An electronic component mounting apparatus that can be used can be provided, which is practical without increasing costs.

It is a top view of an electronic component mounting apparatus. It is a side view of the mounting head in an electronic component mounting apparatus. It is a bottom view of a mounting head in the state where LED emitted light. It is a control block diagram concerning the imaging and recognition processing of an electronic component in the electronic component mounting apparatus.

  An embodiment of the present invention will be described below with reference to FIG. 1 for an electronic component mounting apparatus 1 for mounting electronic components on a printed circuit board P as a substrate. The electronic component mounting apparatus 1 includes a transport device 2 that transports each printed circuit board P in parallel, component supply devices 3A and 3B that are disposed on the front side and the back side of the device main body and supply electronic components, A pair of beams 4A, 4B that can be moved in one direction by a source (reciprocating in the Y direction) and a mounting head body 6 that can be moved separately by each drive source in a direction along each of the beams 4A, 4B. Is provided. The mounting head body 6 will be described later with reference to FIG.

  As for the said conveying apparatus 2, the electronic component mounting apparatus 1 is provided with 2 A of supply conveyors, the positioning part 2B which positions and fixes the printed circuit board P, and the discharge conveyor 2C. Then, the supply conveyor 2A conveys each printed circuit board P received from the upstream to the positioning unit 2B, and after the electronic components are mounted on each substrate positioned by the positioning device in each positioning unit 2B, the discharge conveyor 2C It is the structure conveyed to the downstream apparatus after that.

  The component supply devices 3A and 3B are disposed at the back side and the front side of the transport device 2, and a large number of component supply units 8 are arranged in parallel on the feeder bases of the cart bases 7A and 7B as mounting bases. Is. Each cart base 7A, 7B is detachably disposed on the apparatus main body via a connector so that the tip on the component supply side of the component supply unit 8 faces the conveyance path of the printed circuit board P, and each cart base 7A, When 7B is properly attached to the apparatus main body, power is supplied to the component supply unit 8 mounted on the cart bases 7A and 7B, and when the handle is released and the handle is pulled, it can be moved by a caster provided on the lower surface. It is a configuration.

  The pair of front and rear beams 4A and 4B that are long in the X direction is a slider fixed to each beam along a pair of front and rear guides that are driven by a Y-direction moving drive source constituted by each linear motor. Slide and individually move in the Y direction. The Y-direction moving drive source includes a pair of upper and lower stators fixed along a pair of left and right bases 1A and 1B, and a mover fixed to lower portions of mounting plates provided at both ends of the beams 4A and 4B. 9A.

  The beams 4A and 4B are provided with the mounting head bodies 6 that move along the guides in the longitudinal direction (X direction) by an X-direction moving drive source composed of a linear motor, respectively. The X-direction moving drive source includes a pair of front and rear stators fixed to the beams 4A and 4B, and a mover provided on the mounting head body 6 between the stators.

  Accordingly, each mounting head body 6 is provided inside each beam 4A, 4B so as to face each other, and the mounting head body 6 on the back side takes out electronic components from the component supply unit 8 of the corresponding back side component supply device 3A. It is possible to carry out the work and mount it on the printed circuit board P on the transport device 2, and the front mounting head body 6 takes out the electronic component from the corresponding front component supply device 3B and mounts it on the printed circuit board P. Can do.

  Each mounting head body 6 is composed of a head mounting body 6A and a cylindrical mounting head 6B having a circular shape in plan view, and is movably mounted on the beams 4A and 4B via mounting members 6C. A plurality of suction nozzles 5 serving as component holders are concentrically arranged at predetermined intervals on the peripheral edge of the mounting head 6B. The suction nozzle 5 can be moved up and down by a vertical axis drive source, and can be rotated by a θ axis drive source. The electronic component is taken out from the component supply unit 8 and mounted on the printed circuit board P. .

  Here, the teeth of the component supply unit 8 are fitted into the feed holes opened at predetermined intervals on the storage tape that is sequentially wound in a state of being wound around the supply reel that is rotatably mounted on the cart bases 7A and 7B. A tape feed mechanism that rotates the feed sprocket by a predetermined angle and intermittently feeds the storage tape to the component pick-up / extraction position of the electronic component, and the cover tape is peeled off from the carrier tape before the pick-up / extraction position by driving the peeling motor. The cover tape peeling mechanism is used to peel the cover tape by the cover tape peeling mechanism, and sequentially supply the electronic components loaded in the carrier tape storage portion to the component suction and take-out position.

  In addition, each component recognition camera 10 captures an image of the electronic components sucked and held by each suction nozzle 5 provided in each mounting head 6B before mounting on the printed board P.

  This will be described in detail below with reference to FIGS. First, as described above, the mounting head body 6 can be moved in the X and Y directions by the X direction moving drive source and the Y direction moving drive source, and the mounting head 6B is driven by the drive motor 11 which is a servo motor. Is supported rotatably.

  An illumination device is disposed on the mounting head 6B. In other words, a round bar-shaped light guide body in which an LED 12 as a light source is embedded so as to irradiate light downward in the central portion of the lower portion of the mounting head 6B having a circular shape in plan view and guides light from the LED 12 while diffusing. 13 is disposed below the LED 12. The light guide 13 is mixed with, for example, a granular diffuser for diffusing light inside a transparent acrylic material, exhibits milky white color, and emits diffused light to the outside. The surface may be rough.

  14 is a light shielding case as a hollow cylindrical light shielding body made of aluminum, for example, which is disposed so as to surround the upper half portion of the light guiding body 13. Light is prevented from leaking to the outside in the upper half portion of 13 and is guided downward (lower half portion) from the light shielding case 14.

  Further, a white coating 15 as a light shield is applied to the lower surface of the light guide 13 so that the diffused light does not leak downward, and a black coating 16 is provided at the center of the lower surface of the coating 15. It has been subjected. Accordingly, the light emitted from the LED 12 is guided while being diffused downward by the light guide 13, and the diffused light is emitted from the portion not covered by the light shielding case 14 to the outside of the light guide 13. Become. As described above, the illumination device includes the LED 12, the light guide 13, the light shielding case 14, and the like. Although the light guide 13 is fixed to the mounting head 6B, in FIG. 3, the diffused light from the light guide 13 is radiated to the entire 360 ° circumference, and all the suction nozzles 5 are irradiated.

  Reference numeral 20 denotes a component holding posture recognition camera which is provided with three telecentric lenses 21 and an image pickup element 22 arranged in parallel, and is fixed to the head mounting body 6A via the mounting body 23, and is held by the suction nozzle 5 by suction. A transmission image of the electronic component D is captured. The component holding posture recognition camera 20 is set to have the same height as the electronic component D. More specifically, when imaging the electronic component D sucked and held by the suction nozzle 5, the suction nozzle 5 is raised by the vertical axis drive source as shown in FIG. An electron having a thickness t in which the lower end level of the light guide 13 and the lower end level of the suction nozzle 5 are at the same height level, and the diffused light from the light guide 13 is sucked and held by the suction nozzle 5. The parallel light is selected by the telecentric lens 21 from the transmitted light of the electronic component D and guided to the component holding posture recognition camera 20 and a transmission image of the electronic component is captured.

  More specifically, parallel light is selected and taken out by the imaging device 22, and this image provides a transmission image in which the light guide 13 is a white background. Therefore, among the transmitted light of the electronic component D, parallel light is selected by the telecentric lens 21 and is exposed by the image sensor 22 to capture an image and be captured.

  Next, based on the control block diagram of FIG. 4, reference numeral 25 denotes a control device that performs overall control of operations related to mounting of electronic components of the electronic component mounting device, a determination device that performs various determinations, and various comparisons. In a microcomputer as a comparison device, execution device, etc., mounting coordinate information consisting of X direction, Y direction and angular position in the printed circuit board in order of electronic component mounting step number (for each mounting order) and each component supply unit Storage for storing mounting data composed of arrangement number information, etc., component arrangement position data related to the component ID for each arrangement number of the component supply unit, electronic component size data for each electronic component, component library data composed of thickness data, etc. Unit (storage device).

  Based on the data stored in the storage unit, the microcomputer 25 rotates the mounting head 6B via the motor control circuit 26, the X-direction moving drive source of the mounting head body 1 and the Y-direction. It controls the drive of the movement drive source, the vertical axis drive source of the suction nozzle 5 and the θ-axis drive source.

  Reference numeral 28 denotes a recognition control circuit connected to the microcomputer 25 via a high-speed interface 27. An image obtained by imaging the electronic component D sucked and held by the suction nozzle 5 by the component holding posture recognition camera 20 is obtained. The image is received or the image is recognized based on an instruction from the microcomputer 25. The recognition control circuit 28 receives the current rotational angle position information of the drive motor 9 from the motor control circuit 26, and transmits a trigger signal for lighting the LED 12 to the illumination drive circuit 29, or the image sensor. A trigger signal for starting imaging is transmitted to 22, and a result of recognition processing is transmitted to the microcomputer 25 via the high-speed interface 27.

  With the above configuration, the mounting operation of the electronic component will be described below. First, when the operation start switch portion which is a touch panel switch displayed on the monitor is operated, the printed circuit board P is carried into the positioning portion 2B of the electronic component mounting device 1 from the upstream device, and the positioning operation is started by the positioning mechanism.

  The microcomputer 25 mounts the electronic component according to the mounting data in which the XY coordinate position, the rotation angle position around the vertical axis, the arrangement number, etc., of the printed circuit board P stored in the storage unit are specified. The electronic component to be mounted by the suction nozzle 5 of each mounting head body 6 of the apparatus is controlled so as to be sucked and taken out from each component supply unit 8. Specifically, the mounting head body 6 is moved by moving the mounting head body 6 in the XY directions by the X-direction moving drive source and the Y-direction moving drive source, and the mounting motor 6B is moved counterclockwise in FIG. 2, the vertical axis drive source and the θ axis drive source of each suction nozzle 5 are driven, and each suction nozzle 5 is moved from each component supply unit 8 at the position of the white arrow in FIG. 2. Take out each electronic component. In this case, after the suction nozzle 5 is lowered and the electronic component is taken out from the component supply unit 8, it is raised. In this case, based on the thickness data constituting the part library data stored in the storage unit, the lower end level of the suction nozzle 5 is the same height level as the lower end level of the light guide 13 by the vertical axis drive source. Is controlled by the microcomputer 25.

  The microcomputer 25 controls the drive motor 9 to rotate the mounting head 6B to the imaging position. That is, when the mounting head 6B is rotated (turned) by the drive motor 9, the illumination device provided on the mounting head 6B and each suction nozzle 5 move while rotating together, and the illumination at the imaging position is moved. As described above, the suction nozzle 5 holding the electronic component D to be picked up and picked up from the component supply unit 8 is positioned on a line connecting the apparatus and the component holding posture recognition camera 20.

  In this case, when the drive motor 9 rotates, the recognition control circuit 28 receives rotation angle position information from the motor control circuit 26 when the drive motor 9 rotates by a predetermined angle, and the recognition control circuit 28 triggers the LED 12 to light up. Is transmitted to the illumination driving circuit 29 to light it.

  In addition, the recognition control circuit 28 transmits a trigger signal for starting imaging to the imaging element 22, and is on a line connecting the illumination device that is an imaging position and the component holding posture recognition camera 20 for so-called fly recognition. The electronic part D picked up and held by the suction nozzle 5 is picked up when passing through. And after this imaging, the said illumination drive circuit 29 controls so that the said LED12 may be light-extinguished.

  In this case, when the LED 12 is turned on, the light from the LED 12 is guided downward while the light guide 13 is diffused by the light shield 14. That is, the light diffused by the light guide 13 is guided downward while being reflected by the light shield 14, and reflected upward by the coating 15 as the light shield on the lower surface of the light guide 13. Diffused light is radiated to the outside in all directions of 360 degrees from the peripheral side surface of the lower half of the light guide 13 that is not covered by the light shield 14.

  The diffused light is applied to the electronic component D held by the suction nozzle 5, and the transmitted light is selected as parallel light by the three telecentric lenses 21 and picked up by the image sensor 22. It becomes.

  Then, the recognition control circuit 28 receives an image captured by the image sensor 22 based on an instruction from the microcomputer 25, and the recognition control circuit 28 performs recognition processing of the captured image. The data is transmitted to the microcomputer 25 through the high speed interface 27.

  The microcomputer 25 determines whether or not the microcomputer 25 is held in a normal posture based on the recognition processing result. In this determination, the microcomputer 15 performs the determination based on whether or not the lower surface level of the electronic component D is within a predetermined range. Since the electronic component D is picked up while the suction nozzle 5 holding the electronic component D is picked up, the picked-up image is blurred, but the lower surface level of the electronic component D is Since it is clear, even if the posture is not a normal posture, for example, back-side suction or so-called standing suction, the recognition processing makes it possible for the microcomputer 25 to determine whether or not the posture is reliably held. No problem. Further, it is possible to reliably determine whether or not the electronic component D is attracted to the suction nozzle 5.

  Note that a still image may be taken by instantaneously lighting a brighter illumination with a strobe.

  If it is determined that the posture is not correct, the microcomputer 25 controls to discard and collect, for example, and take out the electronic component from the component supply unit 8 again. When it is determined that the posture is normal, the mounting head body 6 is moved in the X and Y directions, the electronic component sucked and held by the suction nozzle 5 is moved above the component recognition camera 10, and the suction component And recognizing the position of the electronic component by the recognition control circuit 28. Next, the board recognition camera images the positioning mark attached to the printed circuit board, and the recognition control circuit 28 performs the process of recognizing the position of the printed board. Based on the recognition processing results, the microcomputer 25 controls the X-direction movement drive source and Y-direction movement drive source of the mounting head body 1 and the θ-axis drive source of the suction nozzle 5 to correct XYθ. The electronic component is mounted on the printed circuit board P in the positioning portion 2B.

  As described above, according to the present invention, even if the electronic component held by the suction nozzle 5 is irradiated with diffused light, a transmission image of the electronic component held by the suction nozzle is captured as parallel light to obtain the electronic component. It is possible to provide an electronic component mounting apparatus capable of discriminating the posture of the apparatus, which is practical without increasing the cost.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description. It encompasses alternatives, modifications or variations.

6 Mounting head body 6B Mounting head 12 LED
13 Light Guide 14 Light Shield 20 Component Holding Posture Recognition Camera 21 Telecentric Lens 22 Image Sensor

Claims (3)

A mounting head provided with a plurality of component holders with a predetermined interval at the periphery is rotatably supported by the mounting head body, and an electronic component is taken out from the component supply device by the component holder and mounted on the substrate. An electronic component mounting device,
A light source provided in the mounting head; and a light guide disposed below the light source and guiding the light from the light source while diffusing the light. The light diffused by the light guide is transmitted to the mounting head. An illuminating device for irradiating an electronic component held by the component holder
A component holding posture recognition camera is provided that irradiates an electronic component held by the component holder with the light diffused by the light guide and takes a parallel light through a telecentric lens to capture a transmitted image. Electronic component mounting device. A mounting head provided with a plurality of component holders with a predetermined interval at the periphery is rotatably supported by the mounting head body, and an electronic component is taken out from the component supply device by the component holder and mounted on the substrate. An electronic component mounting device,
A light source provided in the mounting head; and a round bar-shaped light guide disposed below the light source and covered with a light-shielding body to guide light downward while diffusing the light from the light source. An illumination device that irradiates an electronic component held by the component holder included in the mounting head with light diffused by a body;
A component holding posture recognition camera is provided that irradiates an electronic component held by the component holder with the light diffused by the light guide and takes a parallel light through a telecentric lens to capture a transmitted image. Electronic component mounting device.   The electronic component mounting apparatus according to claim 1, further comprising a light blocking body that prevents light diffused on a lower surface of the light guide body from leaking downward.

Images