JP4522928B2 - Imaging device, component mounter, imaging method, imaging program - Google Patents

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. 10 is a diagram for explaining the operation of the one-dimensional CCD camera.
A one-dimensional CCD camera 1 shown in FIG. 10 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 on a one-to-one basis. And a shift register 3 that transfers the charges of the light receiving elements 2 on a one-to-one basis, and a shift gate 4 that permits 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, the speed of component mounting machines has been increased, and an apparatus called a high-speed machine that holds a plurality of electronic components at a time and transports them to a substrate and mounts each electronic component has appeared. Accordingly, the one-dimensional CCD camera 1 provided in such an apparatus includes a long light receiving element array 2 having a large number of light receiving elements and a shift register 3 corresponding to the light receiving element array so that a plurality of electronic components can be imaged at a time. It is necessary to prepare.

  However, even when the size of the electronic components to be imaged at a time is small, the interval between the electronic components is constant, and all the useless space between the electronic components is imaged by the long one-dimensional CCD camera, and the charges of all the light receiving elements are obtained. Must be output. Therefore, when this charge is processed as an image signal, there is a problem that a small electronic component generates a large number of pixels unrelated to the image of the electronic component, and it is necessary to perform useless image processing.

Conventionally, as an invention corresponding to imaging a small electronic component with a long one-dimensional CCD camera, as shown in FIG. 11, when imaging a small electronic component P with a long one-dimensional CCD camera 1, 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.

  Further, since it is necessary to dispose two electronic components P in the field of view of the light receiving element array, the electronic components are optimized so that the position of the electronic component P with respect to the one-dimensional CCD camera 1 is optimized each time the size of the electronic component P changes. It is necessary to control the position of P.

  In view of this, the present invention realizes a short processing time without imaging a wasteful part, and even when imaging using a long one-dimensional imaging apparatus that can also simultaneously image a plurality of parts, An object of the present invention is to provide an imaging device that can be placed and imaged.

  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 object to be imaged, three light-shielding plates 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 light shielding unit including a driving unit configured to drive at least one of the three light shielding plates in the length direction of the light receiving element array to continuously change the light shielding range.

  Further, the light shielding means may change a light shielding range corresponding to the size of the imaging object.

  The imaging apparatus further includes a first transfer command signal for permitting the charge generated in the light receiving element to be transferred to the shift register in a time corresponding to the number of the light receiving elements in two ranges that are not shielded from light. It is preferable to include transfer command signal output means for outputting a second transfer command signal to the shift gate.

  According to the above-described invention, the light receiving element array can be shielded from light including the parts according to the size of the object to be imaged, and the object is imaged at a predetermined position corresponding to the central portion of the light receiving element array. Therefore, it is possible to acquire an image with high speed and good aberration.

  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. Corresponding to the vicinity of the boundary of the shift register region, the shift gate that allows or disallows transfer for each region, the optical system disposed between the light receiving element array and the component, both ends of the light receiving element array Three light-shielding plates that shield light from a portion to be shielded, and driving means that drives at least one of the three light-shielding plates in the length direction of the light-receiving element array to continuously change the light-shielding range. And comprising a shielding means, the two parts which are arranged along said light receiving element array, and a moving means for moving the the perpendicular length direction of the light receiving element array.

  The component mounter further includes a first transfer command signal for permitting transfer of the charges generated by the light receiving elements to the shift register at intervals corresponding to the number of the light receiving elements in two ranges that are not shielded from light. Transfer command signal output means for outputting a second transfer command signal to the shift gate is provided, and the multi-mounting head moves the component in synchronization with either the first transfer command signal or the second transfer command signal. It is preferable.

  According to the above invention, in the component mounter, it is possible to acquire a two-dimensional image of a component at a high speed and with good aberration by the imaging device.

  In order to achieve the above object, an imaging method according to the present invention is an imaging method for the imaging device according to claim 3, wherein the light receiving element array receives two ranges of light that are not shielded from light. A light receiving element number acquiring step for acquiring the number of elements, and a transfer command signal for outputting the first transfer command signal and the second transfer command signal in a time based on any of the number of light receiving elements acquired in the light receiving element number acquiring step. An output step, and an image signal storage step of storing the charge output from the shift register as an 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 small component is imaged using a long one-dimensional imaging device that can also capture a plurality of components, not only both ends of the imaging device but also corresponding portions between the components are masked. By arranging a plurality of parts at predetermined positions, it is possible to acquire an image with low distortion and high distortion 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.
FIG. 2 is a side view showing the inside of the component mounter including the imaging device according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, a component mounting machine 100 includes a multi mounting head 101 that sucks, conveys, and mounts a plurality of electronic components, and an XY that can freely move the multi mounting head 101 within a horizontal plane. A robot 102, 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, and a substrate for mounting the electronic component are placed. A table 105 and an imaging device 110 are provided.

  The multi mounting head 101 is provided with mounting heads having suction nozzles for vacuum-sucking electronic components P arranged in two rows. Each mounting head is independently raised and lowered with respect to the main body of the multi mounting head 101. It is supposed to be possible. Although the mounting heads are arranged in two rows, it is not always necessary to hold two electronic components, and one mounting component can be used to hold one electronic component.

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

  3A and 3B are plan views of the imaging device 110, where FIG. 3A shows a state where the light shielding plate is opened, and FIG. 3B shows a state where the light shielding plate is closed.

  4A and 4B are side views showing the relationship among the imaging device 110, the multi-mounting head 101, and the electronic component P. FIG. 4A shows a state where the light shielding plate is opened, and FIG. 4B shows a state where the light shielding plate is closed. ing.

  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 light shielding device 130 that shields the two-dimensional CCD camera 120 from both ends is 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. A light source 112 is provided on both sides of the recognition box 111 so that the lower surface of the electronic component P conveyed above the recognition box 111 can be illuminated brightly.

  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, an output unit 124 that outputs a signal of the shift gate 123, and an optical system 125. And. The one-dimensional CCD camera 120 can obtain an image of the lower surface of the electronic component P by viewing the lower surface of the electronic component P conveyed by the multi-mounting head 101 from below.

  The optical system 125 in the figure is shown as a single lens, but this is conceptually different from the optical system actually provided in the one-dimensional CCD camera 120.

  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.

  The light shielding device 130 includes a light shielding plate 131 disposed on a horizontal plane above the recognition box 111, a support plate 132 that supports the light shielding plate 131, a drive mechanism 133 that drives the light shielding plate 131 in the main scanning direction, and a drive mechanism 133. A first light-shielding device 130a including a motor 134 that applies a driving force to the first light-shielding device 130a, and a symmetrical second light-shielding device 130b having the same configuration as the first light-shielding device 130a. 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.

  The first light-shielding device 130a and the second light-shielding device 130b are controlled by a light-shielding plate driving circuit described later so that the light-shielding plate 131 is driven symmetrically with respect to the light-receiving element array 121, and the motor 134 is driven. Accordingly, the two light shielding plates 131 are moved back and forth symmetrically on the one-dimensional CCD camera 120 so that the one-dimensional CCD camera 120 covers a part of both ends in the main scanning direction, and the main scanning direction of the one-dimensional CCD camera 120 The effective field of view can be enlarged or reduced with the central portion of the light receiving element array 121 as the center.

  Further, a strip-shaped light shielding plate 131 is placed in the recognition box 111 corresponding to the central portion of the light receiving element array 121. The light shielding plate 131 is fixed to the recognition box 111.

FIG. 6 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 determines the predetermined interval based on a main scanning direction variable setting value determined based on the size of the electronic component P. 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. Comparator 612 is provided to open 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 multi mounting 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, detection of the amount of displacement.

  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. 7 is a flowchart for explaining the imaging operation of the electronic component P by the component mounter.

  FIG. 8 is a diagram conceptually showing an imaging state by a one-dimensional CCD camera. FIG. 7 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. 9 is a diagram conceptually showing stored image signals.
First, as shown in FIG. 7, the shapes of the two electronic components P held by the multi mounting head 101 are acquired from the component library, and two main scanning direction variable setting values and two sub scanning direction variable setting values are calculated. To do. Specifically, a setting value that is slightly longer in both the main scanning direction and the sub-scanning direction than the size of the electronic component P is calculated (S801).

  Next, the electronic component P held by the multi-mounting head 101 is transported to the vicinity of the imaging device 110 by the XY robot 102 (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 two main scanning direction variable setting values, the light shielding plate driving circuit 693 controls the light shielding device 130 to shield both ends of the one-dimensional CCD camera 120 (S803). 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. 7A, 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 the figure), 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 in the figure).

  Next, the shift gate 123 receives the first (or second) 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 corresponding region of the shift register 122. (1 in the figure) (S805).

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

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

  Here, the number of image signals to be output is output as image signals by the number of received light receiving elements (five in the figure). 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. 8B, 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. 8), 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. 8) (S805). Charges (B to E) that were not output last time remain in the shift register 122 (1 'in FIG. 8). 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. 8).

  Next, the electric charges accumulated in the shift register 122 are output from the output unit 124 one by one as the image signal 700 (2 'in FIG. 8) in synchronization with the clock signal transmitted from the clock 691. 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. 9A, 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. 9B. 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 of the electronic component P to be imaged, and only the portion that receives light (with some exceptions) Since it is output as an image signal, high-speed imaging can be realized. In addition, it is not necessary to extremely bias the two electronic components P to one of the one-dimensional CCD cameras, and an image can be taken where the aberration is relatively good.

  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 concerning the embodiment of the present invention. 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. It is a top view of an imaging device, (a) has shown the state which opened the light-shielding plate, (b) has shown the state which closed the light-shielding plate. It is the side view which showed the relationship between an imaging device, a multi mounting head, and an electronic component, (a) has shown the state which opened the light-shielding plate, (b) has shown the state which closed the light-shielding plate. FIG. 2 is a side view conceptually showing a one-dimensional CCD camera and showing a relationship between a multi-mounting head and electronic components. 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

DESCRIPTION OF SYMBOLS 1 1-dimensional CCD camera 2 Light receiving element array 3 Shift register 4 Shift gate 5 Output part 6 Light-shielding plate 7 Optical system 100 Electronic component mounting apparatus 101 Multi mounting head 102 XY robot 103 Component supply part 104 Rail 105 Table 110 Imaging apparatus 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 shielding device 131 light shielding plate 132 support plate 133 drive mechanism 134 motor 610 main scanning direction processing unit 611 shift trigger counter pre Setter 612 Comparator 613 Shift trigger counter 620 Sub-scanning direction processing unit 630 Control unit 691 Clock 692 Image processing unit 693 Shading plate drive circuit 694 Head drive circuit 695 Current position count

Claims (7)

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;
At least one of the three light shielding plates that shields both ends of the light receiving element array and a portion corresponding to the vicinity of the boundary of the shift register region, and the length of the light receiving element array. An image pickup apparatus comprising: a light shielding unit including a driving unit configured to drive in a direction and continuously change a light shielding range.   The imaging apparatus according to claim 1, wherein the light shielding unit changes a light shielding range corresponding to a size of the imaging target. The imaging device further includes
Claim 1 or the first transfer command signal and the second transfer instruction signal for permitting to transfer the charges generated before Symbol receiving element to said shift register comprises a transfer instruction signal output means for outputting to the shift gate The imaging device according to claim 2. 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 component;
At least one of the three light shielding plates that shields both ends of the light receiving element array and a portion corresponding to the vicinity of the boundary of the shift register region, and the length of the light receiving element array. Light-shielding means comprising a drive means for driving in the direction and continuously changing the light-shielding range;
A component mounting machine comprising: moving means for moving two components arranged along the light receiving element array perpendicularly to a length direction of the light receiving element array. The component mounter further includes
A first transfer command signal and a second transfer command signal permitting transfer of the charge generated by the light receiving elements to the shift register at intervals corresponding to the number of the light receiving elements in two ranges not shielded from light. Transfer command signal output means for outputting to the shift gate,
Multi mounting head component mounting machine according to claim 4 for moving parts in synchronization with either the first transfer command signal and the second transfer instruction signal. An imaging method for the imaging apparatus according to claim 3,
A light receiving element number obtaining step of obtaining the number of light receiving elements in the two unshielded ranges of the light receiving element array ;
A transfer command signal output step of outputting the first transfer instruction signal and a second transfer command signal,
And an image signal accumulating step for accumulating the electric charge output from the shift register as an image signal. An imaging program for the imaging apparatus according to claim 3,
A light receiving element number obtaining step of obtaining the number of light receiving elements in the two unshielded ranges of the light receiving element array ;
A transfer command signal output step of outputting the first transfer instruction signal and a second transfer command signal,
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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