JPH04335600A - Illumination apparatus of electronic component - Google Patents

Abstract

PURPOSE:To illuminate an electronic component, which is sucked to a suction pipe and which is conveyed in a direction perpendicular to the axial line of the suction pipe, in a line shape along one straight line which is nearly perpendicular to both its conveyance direction and the axial line of the suction pipe. CONSTITUTION:On a frame 12, one pair of casings 92 are installed in positions at the upper part from a diffusion plate 68 and in positions corresponding to a readout head 80 so as to sandwich a suction nozzle 28 in a direction which is extended along one straight line which is perpendicular to both the conveyance direction of an electronic component 32 and the axial line of a suction pipe 64. Ends on one side of many optical fibers are housed. Ends on the other end of the optical fibers are faced with a light source. Light emitted form the optical fibers is diffused by the diffusion plate 68; it illuminates an electronic component 32 in a line shape.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for illuminating electronic components, and more particularly to a device for illuminating electronic components that are attracted to a suction tube and transported in a direction perpendicular to the axis of the suction tube. It is.

0002

2. Description of the Related Art Electronic components are illuminated, for example, when a projected image of the electronic component is captured. When mounting an electronic component on a target member such as a printed circuit board, a projected image of the electronic component is captured, its horizontal position error and rotational angle error are detected, corrected, and mounted on the target member with high precision. As described in Japanese Patent Application Laid-open No. 1-183897, in conventional lighting devices, a light emitting body consisting of a large number of light emitting diodes arranged in a planar manner is attached to a suction tube, and the light emitting body is moved along with electronic components. It was supposed to irradiate the entire electronic component with light.

0003

SUMMARY OF THE INVENTION However, such a lighting device may cause some inconveniences. The reading head, which is installed in the electronic component mounting apparatus described in the above publication and reads the projected image of the electronic component, reads the projected image of the electronic component every time the electronic component moves by a unit distance. A two-dimensional image of the electronic component is obtained by reading in a line in a direction perpendicular to both directions and moving the electronic component. Therefore,
During one reading, it is only necessary to obtain a projected image of one line of the electronic component, and it is necessary to irradiate light onto only one line of the electronic component, whereas conventional illumination devices irradiate light onto the entire electronic component. However, it is wasteful to irradiate light to unnecessary parts where the projected image is not read, and the apparatus becomes larger and more expensive. In addition, since the light emitting body is attached to the suction tube, the suction tube is heavy, which poses a problem that impedes the improvement of the transport speed of electronic components.In addition, it is necessary to provide a light emitting body for each suction tube. In this respect as well, the cost of the device increases. Furthermore, the illuminant attached to the suction tube must be replaced at the same time as the suction tube, but it is cumbersome to disconnect and connect the illuminant to the power source each time the suction tube is replaced. There are also problems that pose a bottleneck to automatic tube replacement. Problems caused by illumination devices shining light onto the entire electronic component are not limited to reading the projected image of the electronic component.
A similar problem occurs when an electronic component is irradiated with light from the side opposite to the suction tube and an image can be read based on the reflected light. The present invention has been made with the above-mentioned circumstances as a background, and an object of the present invention is to provide a lighting device that is small, inexpensive, and capable of illuminating electronic components held in a suction tube without waste.

0004

[Means for Solving the Problems] In order to solve the above problems, the lighting device for electronic components of the present invention includes a light source and a large number of optical fibers each having one end facing the light source. The other end of the optical fiber is arranged in a line along a straight line substantially perpendicular to both the axis of the suction tube and the direction of conveyance of the electronic component, and is supported by a stationary member.

[0005]

[Operation] In the lighting device configured as above,
Electronic components are irradiated with light in a line from the other ends of a large number of optical fibers arranged in a line. Since the optical fiber is supported by a stationary member, the illuminated position of the electronic component on the path in the transport direction does not change, whereas the illuminated portion of the electronic component changes as the electronic component moves. Therefore, when reading the projected image of an electronic component with a line reading head, the other end of the optical fiber should be provided at a position closer to the suction tube than the electronic component and at the same position as the line reading head in the transport direction of the electronic component. In addition, when reading the image based on the reflected light from the electronic component, by providing the other end of the optical fiber on the opposite side of the electronic component from the suction tube, the projected image of the electronic component can be read. It is possible to sequentially irradiate light onto the parts that are exposed. Note that when the other ends of the optical fibers are arranged in a line along a straight line that is substantially perpendicular to both the axis of the suction tube and the transport direction of the electronic component, the optical fibers must be placed in the part where the suction tube is located. Although it is not possible to do so, by installing an optical fiber in a direction that irradiates light toward the suction tube, it is possible to illuminate the portion of the electronic component that is suctioned by the suction tube.

[0006]

[Effects of the Invention] As described above, the lighting device according to the present invention illuminates only the necessary portions of electronic components in a line, and the number of optical fibers is small, making the lighting device compact and inexpensive. be able to. In addition, since the illumination device is installed on a stationary member separately from the suction tube, when reading the projected image of electronic components, the suction tube becomes lighter, making it possible to improve the transport speed of electronic components, and to One lighting device can handle several adsorption tubes.
In this respect as well, device costs can be reduced. Furthermore, when replacing the suction tube, there is no need to consider the connection between the light emitter and the power source as in the conventional case, and the suction tube can be easily replaced automatically.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, reference numeral 10 denotes an electronic component mounting head, which is attached to a frame 12 as a stationary member provided in a fixed position so as to be movable in the X-axis direction (horizontal direction in FIG. 2). A pair of guide rails 14 and a screw shaft 16 are attached to the frame 12 so as to extend in the X-axis direction, and the head body 18 is slidably fitted to the guide rails 14 in a pair of guide blocks 20. , is screwed onto the screw shaft 16 through a nut 22, and is moved in the X-axis direction by rotating the screw shaft 16 by a servo motor (not shown).

A casing 26 is fixed to the front surface of the head main body 18, and a first suction nozzle 28 and a second suction nozzle 30 are held side by side in the X-axis direction. These suction nozzles 28 and 30 are used to vacuum the electronic components 32 and
33, and is attached to the lower ends of vacuum pipes 34 and 36 that supply vacuum, respectively. Splines and threads are formed on the outer circumferential surfaces of these vacuum pipes 34 and 36, and are screwed into a pair of nuts 38 and 40 held in the casing 26 so as to be rotatable and immovable in the axial direction.
, 44 are spline fitted. Nuts 38, 40
are integrally provided with gears 46 and 48, respectively, and the gear 5 is rotated by nozzle lifting motors 50 and 52.
4 and 56, and when the nuts 38 and 40 are rotated by nozzle lifting motors 50 and 52, respectively, the vacuum pipes 34 and 36, that is, the first and second suction nozzles 28 and 30, become independent from each other. be raised and lowered. Further, gears 58 and 60 are integrally provided on the spline members 42 and 44, respectively, and these gears 58 and 60 are rotated by a nozzle rotation motor 61 (see FIG. 1) supported by the casing 26 as a drive source. I am made to do so. A drive gear 6 is attached to the output shaft of the nozzle rotation motor 61.
A transmission gear (not shown) is integrally provided above the intermediate gear 63 and is meshed with the gears 58 and 60, and a common nozzle rotation motor 61 This allows the first and second suction nozzles 28, 30 to be rotated.

The first and second suction nozzles 28 and 30 are for suctioning electronic components of different sizes, and each suction tube 64 has a size corresponding to the size of the electronic component to be suctioned.
, 66. The suction tubes 64 and 66 are provided with their axes extending in the vertical direction, and disc-shaped diffusion plates 68 and 70 having different diameters are respectively attached at right angles to the axes, that is, horizontally. The head body 18 is also provided with a CCD camera 76 mounted by a bracket 74 at a position adjacent to the first and second suction nozzles 28 and 30 in the X-axis direction.
is attached to read the reference marks provided on the printed circuit board. The bracket 74 has a rectangular cross-sectional shape, and its dimensions in a direction perpendicular to both the transport direction of the electronic components 32 and 33 and the axes of the suction tubes 64 and 66 are larger than the suction nozzles 28 and 30, as shown in FIG. It is considered to be slightly larger.

The electronic component mounting head 10 moves between an electronic component supply position and an electronic component mounting position, and mounts the electronic components 32 and 33 received at the electronic component supply position onto the printed circuit board at the electronic component mounting position. Yes, but
A reading head 80 for reading images of the electronic components 32 and 33 is provided below the path along which the electronic component mounting head 10 moves between the supply position and the mounting position. The structure of this reading head 80 is the same as the reading head described in the above-mentioned Japanese Patent Laid-Open No. 1-183897, and will be briefly explained. The reading head 80 has a line sensor consisting of a number of photosensitive elements arranged in a row, and this line sensor is arranged in a direction perpendicular to both the axes of the suction tubes 64 and 66 and the direction of movement of the electronic component mounting head 10. It is set up so that it extends. These photosensitive elements are charged with electric charges according to the intensity of the incident light from the lens, and these electric charges are scanned in an extremely short period of time and compared with a reference value.
One line of read data is formed. Formation of read data is performed every time the electronic components 32 and 33 move by a unit distance (distance corresponding to one line).
, 33 are read in the conveying direction at equal intervals one line at a time, and when they have finished passing through the reading head 80, the data of the entire image of the electronic components 32, 33 is stored in the image memory. A two-dimensional image of the electronic components 32, 33 is obtained by reading the images of the electronic components 32, 33 in a line and moving the mounting head 10, and by comparing this image with a regular image without deviation, the electronic components 32, 33 horizontal position error and rotation angle error (error in a plane perpendicular to the axis of suction tubes 64, 66 and suction tubes 64, 6
The angular error around the axis of 6) is calculated and corrected when mounted on the printed circuit board.

When the image of the electronic component 32 is read by the reading head 80, the electronic components 32 and 33 are illuminated with light by the illumination device 84. As shown in FIG. 1, at a position away from the position corresponding to the reading head 80 of the frame 12 in the transport direction of the electronic components 32, 33, there is a U-shaped bracket 86 with the U-shaped opening facing upward.
A pair of arms 88 are fixed at a distance in a direction perpendicular to both the axes of the suction tubes 64 and 66 and the transport direction of the electronic components 32 and 33. As shown in FIGS. 1 and 3, each of these arms 88 is extended upward to reach a position above the diffusion plates 68 and 70, and is bent from that position to extend toward the reading head 80. After that, the end thereof is bent upward, and the mounting member 90
A casing 92 made of acrylic resin is attached.

As shown in FIGS. 4 to 6, the casing 92 is made up of two side plates 93 and one end plate 94, each of which is fixed to a lug 95 fixed to a mounting member 90 at the side plate 93. has been done. These casings 92 are connected to the transport direction of the electronic components 32, 33 and the suction tubes 64, 6, respectively.
A bracket 74 that supports a CCD camera 76 and a suction nozzle 2 are fixed to each other in a direction perpendicular to the axis of the casing 6 and close to each other.
A gap is formed through which objects 8 and 30 can pass. In these casings 92, gaps 97 are formed which are open to the upper and lower surfaces and which are inclined toward the suction nozzles 28 and 30 as they move downward. It is housed in an inclined state towards the 28 and 30 sides. The casing 92 is the diffuser plate 68,7
0 and is provided on both sides of the suction nozzles 28 and 30, and the end of the optical fiber 98 is located closer to the suction tubes 64 and 66 than the electronic components 32 and 33, and is connected to the bracket 74 and the suction nozzles. 28, 30 pass through, the transport direction of electronic components 32, 33 and the suction tubes 64, 6.
They are arranged along a straight line perpendicular to both the axis line of 6 and 6. In this embodiment, optical fibers 98 each having a diameter of 0.5 mm are arranged in a straight line so that the width of the irradiated light is 3 mm, and the other ends of these optical fibers 98 serve as a light source (not shown). It is made to face a halogen lamp, and light from this light source is transmitted through an optical fiber 98 and irradiated in a line toward the electronic components 32 and 33. At this time, since the optical fiber 98 is provided at an angle,
The light is also irradiated to the bracket 74 and the passage paths of the suction nozzles 28 and 30 where the optical fiber 98 is not provided, and the electronic components 32 and 33 are irradiated with uninterrupted linear light.

[0013] When mounting electronic components on a printed circuit board,
The electronic component mounting head 10 moves to the electronic component supply position,
The first and second suction nozzles 28 and 30 respectively
2 and 33, the projection images are sequentially read by the reading head 80 while moving to the electronic component mounting position. When the electronic components 32 and 33 pass over the reading head 80, the optical fiber 98 sequentially irradiates light in a line toward the electronic components 32 and 33, and this light is diffused by the diffusion plates 68 and 70 and hits the electronic components. Hits 32 and 33 evenly. The linear portions of the diffusion plates 68 and 70 that receive the light from the optical fiber 98 are uniformly illuminated, and the electronic components 32 and 33 are illuminated. Optical fiber 98 is frame 1
2, the light is always directed toward the same position (the position where the line sensor is installed). In addition, as the electronic component 32 moves, the portion of the diffuser plate 68 that is hit by the light (shown with diagonal lines in FIG. 7) changes, and the portion of the electronic component 32 to be read by the reading head 80 is sequentially illuminated. Become.

Furthermore, since the pair of casings 92 are provided with a gap through which the suction nozzles 28, 30 and the bracket 74 can pass, when the electronic components 32, 33 are transported, the suction nozzles 28, 30 and The bracket 74 does not collide with the casing 92, and
The diffusion plates 68, 70 and the CCD camera 76 pass between the pair of arms 88 of the bracket 86 and move without interfering with the bracket 86.

Note that in the above embodiment, the diffuser plate 68,
70 is provided on the suction nozzles 28 and 30, but the diffusion plate may be fixed to the casing 92 that houses the optical fiber 98, or it may be fixed to a stationary member such as the frame 12 or the bracket 86 in addition to the casing 92. You may.

Further, in the above embodiment, the diffuser plate 68,
70 is provided so that the electronic components 32 and 33 are evenly irradiated with light, but it may be omitted if the light can be evenly irradiated without providing a diffuser plate.

Furthermore, in the above embodiment, the diameter is 0.
．． A 5 mm optical fiber 98 was housed in the casing 92 so as to emit light with a width of 3 mm, but
Optical fibers with diameters other than 3 m may also be used.
It is also possible to irradiate light with a width wider or narrower than m.

In addition, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a side view showing an electronic component mounting head in which electronic components are illuminated by an illumination device that is an embodiment of the present invention.

FIG. 2 is a front view of the electronic component mounting head.

FIG. 3 is a plan view showing a state in which the lighting device is attached to a frame.

FIG. 4 is a plan view showing a casing in which optical fibers constituting the lighting device are housed.

FIG. 5 is a front view showing the casing.

FIG. 6 is a bottom view showing the casing.

FIG. 7 is a diagram illustrating lighting of electronic components by the lighting device.

[Explanation of symbols]

10 Electronic component mounting head 32 Electronic parts 33 Electronic parts 64 Adsorption tube 66 Adsorption tube 84 Lighting device 98 Optical fiber

Claims (1)

[Claims] 1. A device for illuminating electronic components that are attracted to a suction tube and transported in a direction perpendicular to the axis of the suction tube, the device comprising a light source and a plurality of lights each having one end facing the light source. an optical fiber, the other ends of the optical fibers are arranged in a line along a straight line substantially perpendicular to both the axis of the suction tube and the transport direction, and are supported by a stationary member. Parts lighting equipment.