JP4645562B2 - Imaging device - Google Patents

Description

The present invention relates to an imaging equipment having a plurality of photoelectric elements arranged in a line.

In the mounting field where electronic components are mounted on a substrate, the position and angle of the electronic component are recognized based on an image obtained by picking up the picked-up electronic component, and after being corrected to a normal position and angle, mounted on the substrate, The mounting accuracy is improved. A CCD camera is widely used for imaging electronic components, and the electronic components are imaged in a light receiving area configured by arranging a plurality of photoelectric elements in a predetermined area, and the amount of light received by each photoelectric element is converted into an electrical signal. An image of the electronic component is captured by performing image processing on the processed image. The time required for this image processing correlates with the resolution of the CCD camera, that is, the number of photoelectric elements arranged in the light receiving area. The larger the number of photoelectric elements, the longer the time required for image processing. Therefore, when imaging a relatively small object such as a relatively small electronic component or a small number of electronic components, the light-receiving area is partially covered with a light-shielding plate, and the light-shielding area has a shape corresponding to the form of the object to be imaged. A method for shortening the time required for image processing by reducing the number of photoelectric elements that receive light is proposed (see Patent Document 1).
JP-A-8-214128

  According to such a method, every time the form of the electronic component to be imaged is changed, the light shielding region is formed in a corresponding form, so that the image processing time can be cumulatively reduced, and the mounting efficiency is improved. Although it can contribute to improvement, if the form of the electronic component and the form of the light shielding area do not correspond accurately, a part of the electronic component may enter the light shielding area. In such a case, since the entire image of the electronic component is not accurately captured, the position and angle of the electronic component are erroneously recognized, resulting in an adverse effect on the mounting accuracy.

Accordingly, the present invention aims at providing an imaging equipment which can shorten the time required for image processing with accurately imaging the imaging object.

The imaging device according to claim 1 is an imaging device that images an electronic component adsorbed by a nozzle of a head of an electronic component mounting device that mounts the electronic component on a substrate, and a light receiving region in which a plurality of photoelectric elements are arranged; A light shielding region forming means for forming a light shielding region in a form corresponding to an electronic component by shielding any one of the plurality of photoelectric elements in the light receiving region, and an electric signal corresponding to the amount of light received by each photoelectric element. Confirming the form of the light shielding area formed in the light receiving area based on the output from the output means, the irradiation means for irradiating the light receiving area, and the output means when the light receiving area is irradiated by the irradiating means comprising a light shielding region forms confirmation means, wherein the light-shielding region forming means comprises a first pattern holes and a second pattern holes having different sizes are formed light shielding plate, before by horizontal movement Switching between the first pattern hole and the second pattern hole, the photoelectric elements at both ends of the plurality of photoelectric elements constituting the light receiving region are shielded from light and the first pattern hole is opposed to the electronic component. It is formed so that only the light receiving element at the position can receive light, and the second pattern hole shields light from the photoelectric elements at both ends and the center among the plurality of photoelectric elements constituting the light receiving region. Only the light receiving element located at a position facing the electronic component can receive light .

The imaging device according to claim 2 is the imaging device according to claim 1, wherein when the form of the confirmed light shielding area does not correspond to the form of the electronic component to be imaged, the light shielding plate is moved horizontally. To change the shape of the light shielding area .

  According to the present invention, the correspondence between the form of the imaging target and the form of the light-shielding area formed in the light-receiving area is confirmed. The time required for image processing and image processing can be reduced.

  Embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the electronic component mounting apparatus according to the embodiment of the present invention, and FIG. 3 is a plan view of the imaging apparatus according to the embodiment of the present invention. 4 is a side view of the imaging apparatus according to the embodiment of the present invention, FIG. 5 is a side view of the imaging apparatus according to the embodiment of the present invention, and FIG. 6 is a control system of the imaging apparatus according to the embodiment of the present invention. FIG. 7 is a flow chart showing the confirmation operation of the light shielding region form in the electronic component mounting apparatus according to the embodiment of the present invention.

  1 and 2, an electronic component mounting apparatus 1 includes a transport rail 3 that transports a substrate 2 on which electronic components are to be mounted to a predetermined position, and a plurality of parts feeders that each store a plurality of electronic components so that they can be supplied. 4, a head 6 that picks up an electronic component supplied from the parts feeder 4 by a plurality of nozzles 5 and transfers it to the substrate 2, and a horizontal moving means that horizontally moves the head 6 above the parts feeder 4 and the substrate 2. An XY orthogonal robot 7, a camera 8 that is a component imaging unit that captures an electronic component adsorbed by the nozzle 5 from below, and an irradiation unit that is provided integrally with the head 6 and irradiates light downward. And a light 9.

  In FIG. 3, a CCD camera is built in a light-shielding housing 11 having a light-transmitting slit 10 provided at the top. In FIG. 4, the CCD camera includes a plurality of photoelectric elements 12 arranged linearly, a plurality of CCD elements 13 arranged corresponding to each photoelectric element 12, and an output amplifier 14. When the electronic component to be imaged is disposed above the slit 10, each photoelectric element 12 at a position corresponding to each part of the electronic component receives light transmitted through the slit 10. The CCD element 13 transfers charges corresponding to the amount of light received by the photoelectric element 12 to the output amplifier 14. The output amplifier 14 functions as an output unit that outputs an electronic signal corresponding to the amount of light received by each photoelectric element 12, converts the electric charge transferred from each CCD element 13 into an electric signal, and outputs the electric signal to the image processing unit 15. . The image processing unit 15 processes the input electrical signal to form an image. The image processing unit 15 includes a position recognition unit 15a and recognizes the position and angle of the electronic component. Since the camera 8 is a line camera in which the photoelectric elements 12 are arranged in a line, only a linear one-dimensional image can be converted at a time. Therefore, in order to obtain an image of the electronic component which is a two-dimensional image, the nozzle 5 that has attracted the electronic component is moved at a constant speed in a direction intersecting the arrangement direction of the photoelectric elements 12, and the electronic component is displayed in a plurality of one-dimensional images. The image is divided into two.

In FIG. 3, a light shielding plate 16 is provided above the housing 11. The light shielding plate 16 can reciprocate in one direction along the upper portion of the housing 11 and has a function of forming a light shielding region in a light receiving region in which a plurality of photoelectric elements 12 are arranged depending on the moved position. The light shielding plate 16 is formed with a first pattern hole 16a and a second pattern hole 16b for light transmission having different sizes . The light shielding plate 16 is attached to the casing 11 as shown in FIG. When the first pattern hole 16a is disposed above the slit 10, the translucent area is reduced from the opening area of the slit 10 to the opening area of the first pattern hole 16a. Become. As a result, as shown in FIG. 4A, among the plurality of photoelectric elements 12 constituting the light receiving region, the photoelectric elements 12a at both ends are shielded from light, and only the light receiving element 12b at a position facing the electronic component P1 receives light. It becomes possible.

On the other hand, when the light shielding plate 16 is moved to the other end side of the housing 11 as shown in FIG. 3B, the two second pattern holes 16b are arranged above the slit 10, and the light transmissive area is increased. The state is reduced from the opening area of the slit 10 to the opening area of the two second pattern holes 16b . As a result, as shown in FIG. 4B, among the plurality of photoelectric elements 12 constituting the light receiving region, the photoelectric elements 12c at both ends and the center are shielded from light, and the light receiving elements are positioned opposite to the two electronic components P2. Only 12d can receive light. The movement of the light shielding plate 16 is controlled by driving the light shielding plate driving motor 17, and the feed screw 18 extended in one direction along the side portion of the housing 11 is rotated forward and backward by driving the light shielding plate driving motor 17. Thus, the light shielding plate 16 connected to the nut 19 screwed to the feed screw 18 reciprocates in one direction along the upper portion of the housing 11.

As described above, the light shielding plate 16 switches the first pattern hole 16 a and the second pattern hole 16 b by horizontally moving the upper portion of the housing 11 by the drive of the light shielding plate driving motor 17. The light-shielding region forming means for forming a light-shielding region corresponding to the form of the electronic component to be imaged in the light-receiving region by shielding one of the light-shielding elements so that photoelectric elements in the region not necessary for imaging do not receive light By doing so, the image processing time is shortened.

  In FIG. 5A, when the pattern hole 16a is irradiated by the light 9 located above the light shielding plate 16, the photoelectric elements 12a at both ends among the plurality of photoelectric elements 12 arranged in the light receiving region do not receive light. Only the photoelectric element 12b receives light. On the other hand, in FIG. 5B, when the pattern hole 16b is irradiated, the photoelectric elements 12c at both ends and the center of the plurality of photoelectric elements 12 arranged in the light receiving region do not receive light, and only the photoelectric element 12d positioned therebetween is received. Receive light. The electric signal output from the output amplifier 14 corresponding to the amount of light received by each photoelectric element 12 is processed in the image processing unit 15. The image processing unit 15 includes a light shielding region form confirmation unit 15b, and functions as a light shielding region form confirmation unit that confirms the form of the light shielding region formed in the light receiving region based on the input electric signal. Since the electrical signal output from the output amplifier 14 corresponds to the amount of light received by each photoelectric element 12, the form of the light shielding region formed in the light receiving region can be confirmed from the waveforms 20a and 20b of the electrical signal.

  In FIG. 6, the control unit 21 controls the mounting operation in the electronic component mounting apparatus based on a preset program. The head drive unit 22 includes an X-axis motor 23 and a Y-axis motor 24 that are drive units of the XY orthogonal robot 7, a Z-axis motor 25 that moves each nozzle 5 in the vertical direction (Z direction), and each nozzle 5. It is comprised with the (theta) axis | shaft motor 26 which is a rotation means to rotate the center circumference ((theta) direction). By driving the head drive unit 22, each nozzle 5 sucks the electronic component from the parts feeder 4 and moves above the camera 8 in the imaging direction for imaging the electronic component. At this time, the light shielding plate 16 is moved to a corresponding position by driving the light shielding plate driving motor 17 in order to form an imaging pattern corresponding to the form of the electronic component. Each nozzle 5 changes the position in the XY direction and the rotation angle in the θ direction based on the position and angle of the electronic component recognized by the image processing unit 15 to correct the position and angle of the electronic component. The electronic component is transferred to the substrate 2. The control unit 21 controls operations of the camera 8, the light 9, the image processing unit 15, the light shielding plate drive motor 17, the output analysis unit 20, and the head drive unit 22 for the determination operation of the selected imaging pattern.

FIG. 7 is a flowchart showing a series of operations when confirming the form of the light shielding area. First, the light 9 is moved above the camera 8 by driving the head drive unit 22 (ST1), and the light receiving region below is irradiated at that position (ST2). The light shielding area form confirmation unit 15b confirms the form of the light shielding area formed in the light receiving area from the analysis of the output waveform (ST3). If the confirmed light shielding area form does not correspond to the form of the electronic component to be imaged, the light shielding plate 16 is moved horizontally to change the light shielding area form (ST4), and again the light shielding area form confirmation (ST3). I do. On the other hand, when it corresponds to the form of the electronic component, or when the changed light shielding area form corresponds to the form of the electronic component to be imaged, the confirmation operation is terminated and the normal mounting operation is resumed.

  In this way, by checking the form of the light shielding area formed in the light receiving area, it becomes possible to accurately correspond the form of the electronic component and the form of the light shielding area, and accurately capture the entire image of the electronic component. Can do.

According to the present invention, the correspondence between the form of the imaging target and the form of the light-shielding area formed in the light-receiving area is confirmed. In addition, it has the advantage that the time required for image processing can be reduced and the time required for image processing can be shortened, which is useful in the field of mounting electronic components.

The top view of the electronic component mounting apparatus of embodiment of this invention The side view of the electronic component mounting apparatus of embodiment of this invention The top view of the imaging device of an embodiment of the invention The side view of the imaging device of embodiment of this invention The side view of the imaging device of embodiment of this invention 1 is a configuration diagram of a control system of an imaging apparatus according to an embodiment of the present invention. The flowchart which shows the confirmation operation | movement of the light shielding area form in the electronic component mounting apparatus of embodiment of this invention

Explanation of symbols

9 Light 12 Photoelectric element 14 Output amplifier 15b Light shielding area form confirmation part 16 Light shielding plate

Claims (2)

An imaging device for imaging an electronic component adsorbed by a nozzle of a head of an electronic component mounting apparatus that mounts the electronic component on a substrate,
A light receiving region in which a plurality of photoelectric elements are arranged; and
A light shielding region forming means for forming a light shielding region of a form corresponding to an electronic component in the light receiving region by shielding any of the plurality of photoelectric elements;
Output means for outputting an electrical signal corresponding to the amount of light received by each photoelectric element;
Irradiating means for irradiating the light receiving region;
A light shielding area form confirmation means for confirming a form of the light shielding area formed in the light receiving area based on an output from the output means when the light receiving area is irradiated by the irradiation means;
Equipped with a,
The light-shielding region forming means includes a light-shielding plate having a first pattern hole and a second pattern hole having different sizes, and moves the first pattern hole and the second pattern hole by moving horizontally. switching,
The first pattern hole is formed such that photoelectric elements at both ends of the plurality of photoelectric elements constituting the light receiving region are shielded from light, and only the light receiving elements at positions facing the electronic component can receive light. ,
In the second pattern hole, among the plurality of photoelectric elements constituting the light receiving region, the photoelectric elements at both ends and the center are shielded, and only the light receiving elements at positions facing the two electronic components can receive light. An imaging apparatus characterized by being formed as described above . The shape of the light shielding region is changed by horizontally moving the light shielding plate when the confirmed shape of the light shielding region does not correspond to the shape of the electronic component to be imaged. Imaging device.

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