JP2007141966A - Imaging device and component mounting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device capable of imaging near the center of an optical system while achieving a short processing time, even when imaging small components by using a long one-dimensional imaging device corresponding even to the imaging of large components and that of components of a plurality of arrays. <P>SOLUTION: The imaging device has a first light-shielding means 130 which includes a light-receiving element array 121, a shift register 122 for outputting an electric charge after dividing it into two regions, a shift gate 123 for allowing or denying transfer of the electric charge to the shift register for each region, the optical system 125, a first light-shielding means 130 provided with a light-shielding plate 131 for light-shielding both ends and the central part of the light-receiving element array 121; a second light-shielding means 130 provided with a light-shielding plate 131 for light-shielding only both end parts of the light-receiving element array 121; and a switching means 137 for changing a light-shielding range of the light-receiving element array 121, while switching between the first/second light-shielding means 130, 130. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an imaging device that captures an imaging object in a one-dimensional manner, a component mounter including the imaging device, and the like.

  In a component mounter that mounts electronic components on a mounting target such as a printed circuit board or lead frame, the mounting head holds the electronic component from the component feeder such as a parts feeder that supplies the electronic component to the top of the mounting target. After carrying, the process of mounting on the mounting object is repeatedly performed.

  In addition, the electronic component held by the mounting head is imaged using an imaging device before being mounted on the mounting target. In order to improve the mounting accuracy, the component mounter obtains the positional deviation of the electronic component from the ideal holding position where the mounting head should hold the electronic component from the captured image, and moves the mounting head based on the positional deviation. After correcting the position, the electronic component is mounted on the object.

  Here, as this imaging device, one that reads an image two-dimensionally at a time and one-dimensional image in a main scanning direction orthogonal to the moving direction while moving an electronic component in a certain direction (sub-scanning direction) There are two types: one that arranges a device for obtaining the image, images the electronic component, and sequentially accumulates the obtained one-dimensional image in the sub-scanning direction to obtain a two-dimensional image of the entire electronic component. Target the latter.

  Next, before mentioning the problems of the prior art, the operation principle of the one-dimensional CCD camera that acquires the one-dimensional image will be described.

FIG. 11 is an explanatory diagram of the operation of the one-dimensional CCD camera.
The one-dimensional CCD camera 1 shown in FIG. 1 includes a light receiving element array 2 in which light receiving elements for accumulating charges corresponding to the intensity of received light are arranged in a line, and elements corresponding to each light receiving element in a one-to-one relationship. And a shift register 3 for transferring the charges of the respective light receiving elements 2 on a one-to-one basis, and a shift gate 4 for permitting transfer from the light receiving element array 2 to the shift register 3.

  The one-dimensional CCD camera acquires a one-dimensional image as follows. That is, each light receiving element of the light receiving element array 2 accumulates charges according to the image formed by the optical system. When a transfer command signal is input to the shift gate 4 after a lapse of a certain time, the charge of each light receiving element is transferred to the corresponding element of the shift register 3 at a time. The charges transferred to the shift register 3 are output one by one from the output unit 5 in synchronization with the clock signal, and this one charge is processed as pixel data of the image signal.

Specifically, when the charge of each light receiving element of the light receiving element array 2 is A ₁ , A ₂ ,..., A _n−1 , _An , when a transfer command signal is input to the shift gate 4, A ₁ , A ₂ ,..., A _n−1 , A _n are transferred to the shift register 3 at a time. Thereafter, A ₁ is output corresponding to the first clock signal, and the signal in the shift register 3 is shifted to the right by one. Subsequently, charges A ₂ ,..., A _n−1 , _An are sequentially output in synchronization with the clock signal, and a one-dimensional image can be acquired if charges corresponding to all the light receiving elements are output.

  By the way, in recent years, component mounters have become faster and more multifunctional, and multifunctional high-speed mounting of electronic components at high speed is possible with a single component mounter, from small electronic components to large electronic components and odd-shaped components. A device called a machine has appeared. In this high-speed multi-function device, for small electronic components, a plurality of electronic components are mounted while being held in a plurality of rows at once, and large or irregular electronic components are held and mounted in a row. The high-speed multi-function device may hold a plurality of electronic component holding units corresponding to the electronic component holding mode.

  Accordingly, the one-dimensional CCD camera 1 provided in such an apparatus has a long light receiving element array 2 having a large number of light receiving elements so as to be able to image electronic components held in a plurality of rows at one time, and a shift corresponding thereto. It is necessary to provide a register 3 and the like.

  However, if the size of each electronic component to be imaged at a time is small, or if the electronic components are held in a row, all of the useless space between the electronic components and on both sides of the electronic components must be imaged. I must. Therefore, in the image captured in this way, there are many pixels that are unrelated to the image of the electronic component, and there is a problem that wasteful image processing must be performed.

Conventionally, as an invention corresponding to the case of imaging a small electronic component with a long one-dimensional CCD camera, as shown in FIG. An invention in which imaging processing can be performed in a time corresponding to the size of the electronic component P by masking one side with the light shielding plate 6 and biasing the two electronic components to the opposite side and then imaging the electronic component P. It is disclosed (see Patent Document 1).
JP-A-8-214128

  However, in the conventional method, since one side of the one-dimensional CCD camera 1 is masked, the visual field of the light receiving element array 2 is biased to one side. Accordingly, the central axis of the optical system 7 and the center of the visual field of the light receiving element array 2 are shifted. If the two electronic components P are imaged in such a state, the image of the component on one side is particularly distorted due to the aberration of the optical system 7, and accurate image processing may not be performed.

  Furthermore, since it is necessary to arrange the electronic component P in the field of view of the light receiving element array biased to one side, the position of the electronic component P with respect to the one-dimensional CCD camera 1 is optimized every time the size of the electronic component P changes. It is necessary to finely adjust the position of the component holding unit to adjust the position of the electronic component P.

  Therefore, the present invention holds a component while realizing a short processing time without imaging a wasteful portion even when imaging is performed using a long one-dimensional imaging apparatus that can simultaneously capture a plurality of components. An object of the present invention is to provide an imaging apparatus or the like that can place a holding unit at a fixed position and perform imaging, and can suppress distortion due to an optical system.

  In order to achieve the above object, an imaging apparatus according to the present invention includes a light receiving element array in which a plurality of light receiving elements that generate charges corresponding to the amount of received light are arranged in a line, and the charges generated by the light receiving elements. A shift register that divides and outputs the received charge into two regions, a shift gate that permits the transfer of the charges generated by the light receiving elements to the shift register, and the light receiving device. An optical system disposed between the element array and the imaging target, and a first light shielding portion that shields light from both ends of the light receiving element array and a portion corresponding to the vicinity of the boundary of the shift register region. The light-receiving element array is switched by switching between a light-shielding means, a second light-shielding means having two light-shielding portions that shield both ends of the light-receiving element array, and the first light-shielding means and the second light-shielding means. Characterized in that it comprises a switching means for changing the range of the light.

  The switching unit may switch the light shielding unit in accordance with the number of imaging objects to be imaged simultaneously.

  The imaging apparatus further includes a transfer command signal for permitting transfer of the charges generated by the light receiving elements to the shift register in a time corresponding to the number of light receiving elements not shielded by the switched light shielding means. It is desirable to provide transfer command signal output means for outputting to the shift gate.

  According to the above invention, it is possible to switch the mode of shielding the light receiving element array in accordance with the number of images to be captured and the arrangement state thereof, and it is possible to perform high-speed processing by eliminating unnecessary image information. In addition, since an object can be imaged at a predetermined position corresponding to the central portion of the light receiving element array, an image with good aberration can be acquired. Further, since the light shielding is performed in stages and the interval between the light shielding plates can be grasped in advance, it is possible to acquire an image accurately and quickly.

  In order to achieve the above object, a component mounter according to the present invention is a component mounter that mounts components on a board, and a plurality of light receiving elements that generate charges corresponding to the amount of received light are arranged in a row. An array of light receiving element arrays, a shift register that receives charges generated by the light receiving elements, outputs the received charges divided into two regions, and a charge that is generated by the light receiving elements to the shift register. A shift gate that permits transfer for each area, an optical system disposed between the light receiving element array and the imaging object, and a boundary between the both ends of the light receiving element array and the shift register area. A first light-shielding means comprising three light-shielding parts for shielding light from corresponding parts, a second light-shielding means comprising two light-shielding parts for shielding both ends of the light-receiving element array, and the light-receiving element array. The light-receiving element array is shielded by switching between the first light-shielding means and the second light-shielding means according to the arrangement state of the parts held by the moving means and the parts held by the moving means. Switching means for changing the range.

  The component mounter further provides a transfer command signal for permitting transfer of the charges generated by the light receiving elements to the shift register in a time corresponding to the number of light receiving elements not shielded by the switched light shielding means. Transfer command signal output means for outputting to the shift gate may be provided, and the moving means may move the component in synchronization with the transfer command signal.

  According to the above invention, in the component mounter, since the light shielding state can be changed corresponding to the component moving means, it is possible to acquire a two-dimensional image of the component at a high speed with good aberration by the imaging device. It becomes possible.

  In order to achieve the above object, an imaging method according to the present invention is an imaging method for the imaging apparatus according to claim 3, and specifies which light shielding means is switched to. And a transfer command signal for permitting transfer of the charge generated by the light receiving element to the shift register at a time corresponding to the light shielding means specified in the light shielding means specifying step. The method includes a command signal output step and an image signal accumulation step of accumulating charges output from the shift register as image signals.

  In the image signal storage step, when the light shielding means specified in the light shielding means specifying step is the first light shielding means, the charges output from the respective shift registers are stored as the respective image signals and specified. When the light shielding means is the second light shielding means, it is desirable to store the charges output from the respective shift registers as one image signal.

  The above object can also be achieved by a program that causes a computer to execute the steps. And the effect similar to the above is realizable.

  According to the present invention, when a relatively small component is imaged using a long one-dimensional imaging device that can also capture large components and components held in multiple rows, the components are held in multiple rows. By switching the light-shielding state of the imaging device corresponding to the case where the component is held in a single row and the case where the component is held in a single row, it is possible to place a relatively small component near the center of the optical system and perform imaging. An image with good distortion and less distortion can be acquired at high speed.

  Next, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, description will be made based on a component mounter provided with an imaging device.

  FIG. 1 is a plan view of a component mounter including an imaging device according to an embodiment of the present invention, where (a) shows a high-speed head and (b) shows a general-purpose head. .

  2A and 2B are side views showing the inside of the component mounting machine including the imaging device according to the embodiment of the present invention, where FIG. 2A includes a high-speed head and FIG. 2B includes a general-purpose head. Is shown.

  As shown in FIGS. 1 and 2, a component mounting machine 100 includes a head 101 that sucks, conveys, and mounts a plurality of electronic components, an XY robot 102 that can freely move the head 101 in a horizontal plane, A component supply unit 103 for supplying a plurality of types of electronic components from large to small, a rail 104 for transporting a substrate on which the electronic component is mounted, a table 105 on which the substrate is mounted for mounting the electronic component, An imaging device 110.

  The head 101 is a unit that moves electronic components and mounts them on a substrate. Particularly, the high-speed head 101 is provided with mounting heads provided with suction nozzles that vacuum-suck the electronic component P in two rows. On the other hand, the general-purpose head 101 is provided with the mounting heads arranged in a line. Each of the mounting heads can be lifted and lowered independently with respect to the main body of the head 101. After the positioning of the head 101 in the horizontal plane, the mounting head is lifted and lowered to move the electronic component. It can be adsorbed or mounted with electronic components.

  Further, the high-speed head 101 and the general-purpose head are used by switching according to the mounting order of components, for example, as necessary. Specifically, the high-speed head 101 is used in the early stage of the mounting order in which many relatively small electronic components are mounted, and the general-purpose head is switched and used in the late stage of mounting in which the relatively large or odd-shaped electronic components are mounted. To do.

  The XY robot 102 can move the head 101 freely in a horizontal plane, and the XY robot 102 and the head 101 function as moving means for moving electronic components.

  3A and 3B are plan views of the imaging device 110, where FIG. 3A shows a state where light is shielded by light shielding means that shields only both ends, and FIG. 3B shows a case where light is shielded by light shielding means that shields both ends and the central part. Show.

  4A and 4B are side views showing the relationship among the imaging device 110, the head 101, and the electronic component P. FIG. 4A shows a state where light is shielded by light shielding means corresponding to the high-speed head 101, and FIG. A state where light is shielded by corresponding light shielding means is shown.

  As shown in FIGS. 3 and 4, the imaging device 110 includes a recognition box 111, a one-dimensional CCD camera 120 that is housed in the recognition box 111 and images the lower surface of the electronic component P that passes over the recognition box 111, and 1 A mask 135 that shields the three-dimensional CCD camera 120 and a driving device 137 that moves the mask 135 are provided.

  The recognition box 111 has a light-shielding property provided with a slit-like window 113 extending in the main scanning direction of the one-dimensional CCD camera 120 so that unnecessary light does not enter the one-dimensional CCD camera 120 accommodated therein. Box.

  As shown in FIG. 5, the one-dimensional CCD camera 120 has a light-receiving element array 121 in which a plurality of light-receiving elements are arranged one-dimensionally and charges generated by the light-receiving elements of the light-receiving element array 121 on a one-to-one basis. A shift register 122 including an element that can receive the signal, a shift gate 123 that controls transfer of charges from the light receiving element array 121 to the shift register 122, and an output unit 124 that outputs a signal of the shift gate 123 are provided. . The one-dimensional CCD camera 120 can obtain the image of the lower surface of the electronic component P by viewing the lower surface of the electronic component P conveyed by the head 101 from below.

  In addition, the shift register 122 is divided into two regions with a central portion as a boundary, and the right region outputs charges to the right output unit 124, and the left region outputs charges to the left output unit 124. Has been made.

  As shown in FIG. 3, the light shielding means 130 includes two light shielding plates 131 that are three light shielding portions arranged in a line at a predetermined interval on a horizontal plane above the recognition box 111 and two light shielding plates 131. And two light shielding plates 131 which are the light shielding portions. In the case of the present embodiment, a rectangular plate is provided at a predetermined interval by including a portion provided with two rectangular holes arranged in a row on one plate and a portion provided with one long rectangular hole aligned with this portion. Three light shielding plates 131 and two light shielding plates 131 are realized.

  More specifically, as shown in FIG. 6, in the first light shielding means 130b, three light shielding plates 131 are arranged with two rectangular holes interposed therebetween. In the second light shielding means 130a, two light shielding plates 131 are arranged with a long rectangular hole interposed therebetween. The first light shielding means 130b and the second light shielding means 130a are integrated, and a mask 135 is formed.

  The switching device 137 includes a driving mechanism 133 that drives the mask 135 in the sub-scanning direction, and a motor 134 that applies a driving force to the driving mechanism 133. The drive mechanism 133 can be exemplified by a structure in which the support plate 132 functions as a ball nut and is screwed into a ball screw rotatably supported.

  Then, the mask 135 is moved stepwise with respect to the light receiving element array 121 as shown in FIGS. 3A and 3B, so that the one-dimensional CCD camera 120 is moved to a part of both ends and a shift register in the main scanning direction. It is possible to switch between two states of covering the vicinity of the boundary 122 and covering only a part of both ends.

  The switching device 137 can switch from the upper side of the light receiving element array 121 to the state where the mask 135 is removed. In this case, the light receiving measure array 121 is used without being shielded from light.

  The light shielding device may be any device that does not generate charges at both ends of the light receiving element array, and an effect similar to that of the mask 135 can be obtained by an electronic device such as a liquid crystal shutter.

  In FIG. 5, the light shielding means 130 is disposed between the one-dimensional CCD camera 120 and the lens 125, but may be disposed between the electronic component P and the lens 125.

FIG. 7 is a diagram illustrating a functional configuration of the component mounter 100 according to the present embodiment.
As shown in the figure, the component mounter 100 includes a transfer command signal output unit 610, a sub-scanning direction processing unit 620, a control unit 630, a clock 691, an image processing unit 692, a light shielding plate driving circuit 693, A head driving circuit 694 and a current position counter 695 are provided.

  The transfer command signal output unit 610 is a processing unit that outputs a first transfer command signal and a second transfer command signal that permit transfer to the shift gate 123 at predetermined time intervals. In the present embodiment, the interval at which the first transfer command signal is output and the interval at which the second transfer command signal is output are the same, so one transfer command signal substitutes for the first transfer command signal and the second transfer command signal. is doing. That is, when one transfer command signal is output, the shift gate 123 simultaneously transfers the charges of the light receiving element array 121 to the two regions of the shift register 122.

  The transfer command signal output unit 610 is a processing unit that outputs a transfer command signal permitting transfer to the shift gate 123 at a predetermined interval. Further, the transfer command signal output unit 610 determines the predetermined interval based on a main scanning direction variable setting value determined based on the switched light shielding unit 130. The predetermined interval is obtained by counting clock signals generated by the clock 691. That is, the transfer command signal output unit 610 controls the timing for transferring charges from the light receiving element array 121 of the one-dimensional CCD camera 120 to the shift gate 123.

  The transfer command signal output unit 610 is reset by the shift command counter presetter 611 to which the main scanning direction variable set value is set from the control unit 630 and the transfer command signal output from the comparator 612, and counts up the clock signal. Whether the current value in the main scanning direction indicated by the shift trigger counter 613 has reached the main scanning direction variable reference value indicated by the shift trigger counter 613 that outputs the current value in the main scanning direction to the comparator 612 and the shift trigger counter presetter 611. A comparator 612 is provided for comparing and opening the shift gate 123 by outputting a transfer command signal to the shift gate 123 when the comparison is reached. The transfer command signal is also output to the screen trigger counter 623 of the sub-scanning direction processing unit 620 at the same time.

  Next, the sub-scanning direction processing unit 620 calculates the movement amount of the electronic component P calculated from the number of transfer command signals output from the transfer command signal output unit 610 and the sub-scanning direction variable set value given from the control unit 630. The sub-scanning direction processing unit outputs an in-field processing completion signal to the image processing unit 692 when the movement amount of the electronic component P reaches the sub-scanning direction variable setting value. That is, the sub-scanning direction processing unit 620 is a processing unit that defines the length of the image processed in the image processing unit 692 in the sub-scanning direction.

  The sub-scanning direction processing unit 620 is reset by the screen trigger counter presetter 621 to which the sub-scanning direction variable setting value is set from the controller 631 and the in-field processing completion signal output from the comparator 622 and increases the transfer command signal. The screen trigger counter 623 that counts and outputs the current value in the sub-scanning direction is compared with whether the sub-scanning direction current value indicated by the screen trigger counter 623 reaches the sub-scanning direction variable reference value indicated by the screen trigger counter presetter 621. When it reaches, the controller 631, the image processing unit 692, and the image trigger counter 623 are each provided with a comparator 622 that outputs an in-field process completion signal and resets the screen trigger counter 623.

  The control unit 630 is a processing unit that controls the entire component mounter 100. Further, as described above, the head drive circuit 694 is controlled to control the movement of the electronic component P. The transfer command signal output unit 610 is provided with a main scanning direction variable setting value corresponding to the effective visual field length in the main scanning direction according to the size of the electronic component P currently sucked by the nozzle. At the same time, an instruction indicating the tip position of the light shielding plate 131 is output to the light shielding plate driving circuit 693 to control the number of light receiving elements to be covered in the light receiving element array 121.

  Further, the control unit 630 outputs a start signal to the sub-scanning direction processing unit 620 when the head 101 transports the electronic component P to a predetermined position.

  When the reading completion signal is input, the image processing unit 692 processes the read image signal and outputs the processing result to the control unit 630. The processing content of the image processing unit 692 is the processing content of the obtained image. In addition to correcting the deviation, it has functions that can be arbitrarily selected, such as detection of the presence / absence of the electronic component P and detection of the amount of positional deviation.

  Further, when imaging the electronic component P held by the high-speed head 101, the image processing unit 692 processes the outputs from the two shift registers 122 as two images, and performs electronic processing held by the general-purpose head 101. When the part P is imaged, the outputs from the two shift registers 122 are processed as one image.

  The read completion signal is also output to the control unit 630, and when receiving the read completion signal, the control unit 630 controls the XY robot 102 and the like so as to instruct the head driving circuit 694 to move to the next step.

  The control unit 630 is a storage unit including a memory that stores the type of electronic component P to be attracted to the nozzle, its size, and a main scanning direction variable setting value, a sub-scanning direction variable setting value, and the like appropriately set according to the size. 632 and a controller 631 that performs input / output with reference to data in the storage unit 632.

  With the above function, the component mounter 100 can obtain a two-dimensional image of the electronic component P by the one-dimensional CCD camera 120.

Next, the operation of the imaging device 110 will be described.
FIG. 8 is a flowchart for explaining the imaging operation of the electronic component P by the component mounter.

  FIG. 9 is a diagram conceptually showing an imaging state by a one-dimensional CCD camera. FIG. 8 shows one side of the two regions of the shift register 122 and the light receiving element array 121 and the shift gate 123 corresponding thereto.

FIG. 10 is a diagram conceptually showing stored image signals.
First, it is acquired whether the first light shielding unit 130b or the second light shielding unit 130a is set, the shape of the electronic component P held by the head 101 is acquired from the component library, and the main scanning direction variable setting is obtained. Value and a sub-scanning direction variable setting value are calculated. Specifically, a time corresponding to the interval between the light shielding plates 131 is selected and calculated as a main scanning direction variable setting value. On the other hand, a value slightly longer than the size in the sub-scanning direction is calculated as the sub-scanning direction variable setting value (S801).

  Next, the electronic component P held by the head 101 by the XY robot 102 is transported to the vicinity of the imaging device 110 (S802). More specifically, two electronic components P are arranged at the center of the two fields of view of the one-dimensional CCD camera 120, and the end of the electronic component P is arranged at a predetermined position near the one-dimensional CCD camera 120. The

  Next, based on the main scanning direction variable setting value, the light shielding plate driving circuit 693 controls the switching device 137 to switch the mask 135 to shield both ends of the one-dimensional CCD camera 120 (S803). Note that the conveyance (S802) and the light shielding (S803) may be performed before and after, or may be performed simultaneously.

  Next, the imaging device 110 performs imaging as follows. In the following description, one of the two regions of the shift register 122 is described. Since the other is the same as the following description, the description is omitted.

  First, the first area in the sub-scanning direction is imaged by the one-dimensional CCD camera 120. That is, as shown in FIG. 9A, charges are accumulated in the light receiving element array 121 based on the field of view of the one-dimensional CCD camera 120 (S804).

  Charges are accumulated in the central portion of the light receiving element array 121 (A, B, C, D, and E in FIG. 9), but both ends of the light receiving element array 121 are shielded from light by light shielding plates (not shown). Therefore, there is no charge accumulation (hatched line in FIG. 9).

  Next, the shift gate 123 receives the transfer command signal transmitted from the transfer command signal output unit 610, and charges are transferred from the light receiving element array 121 to the shift register 122 (1 in FIG. 9) (S805).

  Here, since there is no charge accumulation in the shift register 122 in the initial state (0 in FIG. 9), the charge state of the light receiving element array 121 is transferred as it is.

  Next, the electric charges accumulated in the shift register 122 in synchronization with the clock signal transmitted from the clock 691 are output one by one from the output unit 124 as the image signal 700 (1 ′ in FIG. 9) (S806).

  Here, the number of output image signals is output as image signals by the number of received light receiving elements (five in FIG. 9). Therefore, the image signal 700 obtained based on one transfer command signal is a part of the total charges acquired by the light receiving element array 121.

  The number of outputs is controlled by the number of clock signals for shifting the shift register 122 based on the main scanning direction variable setting value.

  Next, the XY robot 102 moves the electronic component P by a predetermined amount in the sub-scanning direction (S807).

  The above-described light reception → transfer → output → movement (S804 to S807) is repeated until the larger sub-scanning direction variable setting value expires to accumulate image signals.

However, the output image signal is as follows.
As shown in FIG. 9B, in the second and subsequent light receptions, the next charge is accumulated in the central portion of the light receiving element array 121 (F to J in FIG. 9), and the charge is accumulated in both ends. No (S804).

  Next, charges are transferred from the light receiving element array 121 to the shift register 122 (2 in FIG. 9) (S805). Charges (B to E) that were not output last time remain in the shift register 122 (1 'in FIG. 9). However, since the light receiving elements of the light receiving element array 121 corresponding to the portions where the charges remain are shielded from light and do not accumulate charges, the remaining charges (B to E) are maintained as they are even if the charges are transferred. Then, the charges (F to J) of the light receiving element array 121 are accumulated following the charges (B to E) (2 in FIG. 9).

  Next, the charges accumulated in the shift register 122 are output one by one as the image signal 700 from the output unit 124 in synchronization with the clock signal transmitted from the clock 691 (2 'in FIG. 9). Again, the number of output image signals 700 is the same as the previous time.

  Therefore, in the image signal 700 obtained here, the charge transferred last time and the charge transferred this time are output side by side.

  Finally, as shown in FIG. 10A, only the shifted image can be obtained with the stored image signal, so the image processing unit 692 corrects the shift of the image as shown in FIG. 10B. Then, an accurate image is created (S808).

  When the electronic component P is imaged by the configuration and operation as described above, a portion that does not need to receive light is shielded according to the size and arrangement of the electronic component P to be imaged, and only the light receiving portion (with some exceptions) ) Since it is output as an image signal, high-speed imaging can be realized. In addition, since images of the two electronic components P can be taken simultaneously, the speed can be further increased. Moreover, since the image of one electronic component P is divided and imaged, the speed can be increased even in a single case.

  Note that the light shielding plate 131 provided in the mask 135 of this embodiment is bilaterally symmetric, that is, uniformly shields the light receiving element array 121, but the present invention is not limited to this, and is bilaterally asymmetric. It doesn't matter.

  The present invention can be applied to an imaging apparatus, and in particular to an imaging apparatus provided in a component mounter.

It is a top view of the component mounting machine provided with the imaging device which concerns on embodiment of this invention, (a) is provided with the high-speed head, (b) has shown the thing provided with the general purpose head. It is a side view which shows the inside of the component mounting machine provided with the imaging device which concerns on embodiment of this invention, (a) is equipped with the high-speed head, (b) has shown the thing provided with the general purpose head. . 2A and 2B are plan views of the imaging apparatus 110, where FIG. 1A illustrates a state where only both ends are shielded by light shielding means, and FIG. 3B illustrates a case where both ends and a central part are shielded by light shielding means. 2 is a side view showing the relationship among the imaging device 110, the head 101, and the electronic component P, where (a) is a state where light is shielded by a light shielding means corresponding to the high-speed head 101, and (b) is a light shielding means corresponding to the general-purpose head 101. FIG. The shaded state is shown. FIG. 2 is a side view conceptually showing a one-dimensional CCD camera and showing a relationship between a head and electronic components. It is a top view which shows a mask. It is a figure which shows the function structure of the component mounting machine of this embodiment. It is a flowchart for demonstrating the imaging operation of the electronic component by a component mounting machine. It is a figure which shows notionally the imaging state by a one-dimensional CCD camera. It is a figure which shows notionally the accumulate | stored image signal. It is a figure which shows a one-dimensional CCD camera notionally. It is a figure which shows the conventional image pick-up device notionally.

Explanation of symbols

1 one-dimensional CCD camera 2 light receiving element array 3 shift register 4 shift gate 5 output unit 6 light shielding plate 7 optical system 100 electronic component mounting device 101 head 102 XY robot 103 component supply unit 104 rail 105 table 110 imaging device 111 recognition box 112 light source 113 Window 120 One-dimensional CCD camera 121 Light receiving element array 122 Shift register 123 Shift gate 124 Output unit 125 Optical system 130 Light blocking device 131 Light blocking plate 132 Support plate 133 Drive mechanism 134 Motor 610 Main scanning direction processing unit 611 Shift trigger counter presetter 612 Comparator 613 Shift trigger counter 620 Sub-scanning direction processing unit 630 Control unit 691 Clock 692 Image processing unit 693 Shading plate driving circuit 694 Head driving circuit 695 Current position counter

Claims (8)

A light receiving element array in which a plurality of light receiving elements that generate electric charges corresponding to the amount of received light are arranged in a line;
A shift register for receiving the charge generated by each of the light receiving elements and outputting the received charge in two regions;
A shift gate for allowing or rejecting each region to transfer the charge generated by each light receiving element to the shift register;
An optical system disposed between the light receiving element array and the imaging object;
First light-shielding means comprising three light-shielding portions that shield light from both ends of the light-receiving element array and a portion corresponding to the vicinity of the boundary of the shift register region;
A second light-shielding means comprising two light-shielding portions that shield both ends of the light-receiving element array;
An imaging apparatus comprising: a switching unit that switches between the first light shielding unit and the second light shielding unit to change a range in which the light receiving element array is shielded.   The imaging apparatus according to claim 1, wherein the switching unit switches the light shielding unit according to the number of imaging objects to be imaged simultaneously. The imaging device further includes
Transfer that outputs to the shift gate a transfer command signal that allows the charge generated by the light receiving elements to be transferred to the shift register in a time corresponding to the number of light receiving elements that are not shielded by the switched light shielding means. The imaging apparatus according to claim 1, further comprising a command signal output unit. A component mounter for mounting components on a board,
A light receiving element array in which a plurality of light receiving elements that generate electric charges corresponding to the amount of received light are arranged in a line;
A shift register for receiving the charge generated by each of the light receiving elements and outputting the received charge in two regions;
A shift gate for allowing or rejecting each region to transfer the charge generated by each light receiving element to the shift register;
An optical system disposed between the light receiving element array and the imaging object;
First light-shielding means comprising three light-shielding portions that shield light from both ends of the light-receiving element array and a portion corresponding to the vicinity of the boundary of the shift register region;
A second light-shielding means comprising two light-shielding portions that shield both ends of the light-receiving element array;
Moving means for moving the component so as to intersect with the length direction of the light receiving element array;
A switching unit that switches between the first light shielding unit and the second light shielding unit according to the arrangement state of the components held by the moving unit, and changes a range of shielding the light receiving element array;
A component mounting machine comprising: The component mounter further includes
Transfer that outputs to the shift gate a transfer command signal that allows the charge generated by the light receiving elements to be transferred to the shift register in a time corresponding to the number of light receiving elements that are not shielded by the switched light shielding means. Command signal output means,
The component mounting machine according to claim 4, wherein the moving unit moves the component in synchronization with the transfer command signal. An imaging method for the imaging apparatus according to claim 3,
A light shielding means identifying step for identifying which light shielding means has been switched;
Transfer command signal output for outputting to the shift gate a transfer command signal for permitting transfer of the charge generated by the light receiving element to the shift register at a time corresponding to the light blocking means specified in the light blocking means specifying step. Steps,
And an image signal accumulating step for accumulating the electric charge output from the shift register as an image signal. The image signal accumulation step further includes
When the light shielding means specified in the light shielding means specifying step is the first light shielding means, the charges output from the respective shift registers are stored as the respective image signals, and the specified light shielding means is the second light shielding means. 7. The imaging method according to claim 6, wherein the charge output from each shift register is stored as one image signal. An imaging program for the imaging apparatus according to claim 3,
A light shielding means identifying step for identifying which light shielding means has been switched;
The shift command signal that allows the charge generated by the light receiving element to be transferred to the shift register at a time corresponding to each between two sets of light shielding portions of the light shielding means specified in the light shielding means specifying step. A transfer command signal output step to output to the gate;
An imaging program for causing a computer to execute an image signal accumulation step of accumulating electric charges output from the shift register as an image signal.

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