JP5007352B2 - Imaging device, component mounting machine - 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. 11 is an explanatory diagram of the operation of the one-dimensional CCD camera.
A one-dimensional CCD camera 1 shown in FIG. 11 includes a light receiving element array 2 in which light receiving elements that generate charges according 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 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 generates a charge according to an 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 A1, A2,..., An-1, An, when a transfer command signal is input to the shift gate 4, each charge A1, A2,. ..., An-1 and An are transferred to the shift register 3 at a time. Thereafter, A1 is output corresponding to the first clock signal, and the signal in the shift register 3 is shifted to the right by one. Subsequently, the charges A2,..., An-1, An are sequentially output in synchronization with the clock signal, and if the charges corresponding to all the light receiving elements are output, a one-dimensional image can be acquired.

  By the way, in recent years, a device called a multi-function device that mounts a very large size electronic component to a small size electronic component with a single device has appeared. Accordingly, the one-dimensional CCD camera 1 provided in such an apparatus needs to include 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 the largest electronic component can be imaged. There is.

  However, in such a long one-dimensional CCD camera 1, even when imaging a small part, all the light receiving elements generate charges, and all the charges are transmitted and 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 for solving the above-described problem, as shown in FIG. 12, when a small electronic component P is imaged by a long one-dimensional CCD camera 1, one side of the one-dimensional CCD camera 1 is masked by a light shielding plate 6 and necessary. An invention is disclosed in which imaging processing can be performed in a time corresponding to the size of the electronic component P by imaging a small electronic component P with only a portion (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, and the center of the optical system 7 and the center of the visual field of the light receiving element array 2 are shifted. If the electronic component P is imaged in such a state, the image may be 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 center of the field of view of the light receiving element array, the position control is performed so that 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. Need to do.

  Therefore, the present invention performs imaging near the center of the optical system while realizing a short processing time even when imaging a small component using a long one-dimensional imaging apparatus that can also capture a large component. An object of the present invention is to provide an imaging device capable of performing the above.

  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 received light quantity are arranged in a line, and charges generated by the light receiving elements. A shift register that outputs the received charge to the output unit, a shift gate that permits or rejects transfer of the charge generated by each light receiving element to the shift register, the light receiving element array, and the imaging object A first light shielding means including an optical system disposed between the light receiving element array and a plurality of light shielding plates disposed at predetermined intervals for shielding light at both ends of the light receiving element array; A second light-shielding unit having a plurality of light-shielding plates arranged at predetermined intervals, and a switching unit that switches between the first light-shielding unit and the second light-shielding unit to change a range of shielding the light-receiving element array. A transfer command signal 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 interval according to the interval between the light shielding plates of the switched light shielding means. Output means.

  According to the above invention, the light receiving element array can be shielded according to the size of the object to be imaged, and the object can be imaged near the central axis of the optical system at the center of the light receiving element array. It is possible to acquire an image with high speed and good aberration. 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 each of the light receiving elements, and outputs the received charges to an output unit, and transfers charges generated by the light receiving elements to the shift register. A first light shielding means comprising: a shift gate that permits or rejects; an optical system disposed between the light receiving element array and the imaging target; a plurality of light shielding plates that shield both ends of the light receiving element array; A range of light shielding the light receiving element array is changed by switching between a second light shielding unit including a plurality of light shielding plates having different light shielding ranges from the one light shielding unit, and the first light shielding unit and the second light shielding unit. The charge generated by the light receiving element at a time interval corresponding to the interval between the light shielding plate of the switching means, the moving means for moving the component perpendicular to the length direction of the light receiving element array, and the switched light shielding means. Transfer command signal output means for outputting to the shift gate a transfer command signal that permits transfer to the shift register, and the moving means moves the component in synchronization with the transfer command signal. To do.

  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 apparatus, wherein the light shielding unit identifying step identifies which light shielding unit has been switched to, and the light shielding. A transfer command signal output step for outputting a transfer command signal at a time interval corresponding to between the light shielding plates of the light shielding means specified in the means specifying step, and an image signal storage for storing the charge output from the shift register as an image signal And a step.

  According to the above invention, the light receiving element array can be shielded according to the size of the object to be imaged, and the object can be imaged near the central axis of the optical system at the center of the light receiving element array. It is possible to acquire an image with high speed and good aberration. 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.

  The imaging apparatus receives 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 each of the light receiving elements, and outputs the received charges to an output unit. A shift register, a shift gate that permits or rejects transfer of the charges generated by the light receiving elements to the shift register, an optical system disposed between the light receiving element array and the imaging object, and the light receiving A first light shielding unit including two light shielding plates arranged at a predetermined interval for shielding both ends of the element array, and two light shielding units arranged at a predetermined interval different from the first light shielding unit. A second light shielding unit including a plate; and 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.

  Further, the switching means may switch the light shielding means corresponding to the size of the object to be imaged.

  The imaging apparatus further outputs a transfer command signal for permitting transfer of the charge generated by the light receiving element to the shift register in a time corresponding to the interval between the light shielding plates of the switched light shielding means. It is preferable to provide a transfer command signal output means.

  The component mounter is a component mounter that mounts components on a board, and 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 row, and the light receiving elements that are generated by the light receiving elements. A shift register that receives the received charges and outputs the received charges to the output unit, a shift gate that permits or rejects transfer of the charges generated by the light receiving elements to the shift register, the light receiving element array, and an imaging target An optical system disposed between the first light-shielding element array, a first light-shielding means including two light-shielding plates that shields both end portions of the light-receiving element array, and two sheets having different light-shielding ranges from the first light-shielding means A second light-shielding means having a light-shielding plate, a switching means for switching between the first light-shielding means and the second light-shielding means to change a range for shielding the light-receiving element array, and a direction perpendicular to the length direction of the light-receiving element array In And a moving means for moving the goods.

  The component mounter further sends a transfer command signal to the shift gate for permitting transfer of the charge generated by the light receiving element to the shift register in a time corresponding to the interval between the light shielding plates of the switched light shielding means. It is preferable that a transfer command signal output means for outputting is provided, and the moving means moves the component in synchronization with the transfer command signal.

  The imaging method is an imaging method for an imaging apparatus, and includes a light shielding unit specifying step that identifies which light shielding unit has been switched and a light shielding plate of the light shielding unit that is specified in the light shielding unit specifying step. A transfer command signal output step for outputting a transfer command signal at a predetermined time, and an image signal storage step for 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 large component, both ends of the imaging device are masked so that a small size is obtained near the center of the optical system. Therefore, it is possible to take an image by arranging the above components, and it is possible to acquire an image with little distortion and high distortion at a high speed. Further, the masking range is stepwise and fixed, and the distance between the light shielding plates can be grasped in advance, so that an image can be acquired accurately and quickly.

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. 4A and 4B are plan views of the imaging apparatus, where FIG. 5A shows a state where light is not shielded, FIG. 5B shows a state where light is shielded by a light shielding unit having a small light shielding range, and FIG. Yes. It is the side view which showed the relationship between an imaging device, a multi mounting head, and an electronic component, (a) is the state shielded with the light-shielding means with a small light-shielding range, (b) is the state shielded with the light-shielding means with a large light-shielding range. Show. FIG. 2 is a side view conceptually showing a one-dimensional CCD camera and showing a relationship between a multi-mounting head and an electronic component. 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.

  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.

  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 is a state where light is not shielded, FIG. 3B is a state where light is shielded by a light shielding unit having a small light shielding range, and FIG. Shows the case.

  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 light is shielded by a light shielding means having a small light shielding range, and FIG. 4B shows a large light shielding range. A state where light is shielded by the 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, 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.

  Although the optical system 125 in FIG. 5 is shown as a single lens, this is conceptually different from the optical system actually provided in the one-dimensional CCD camera 120.

  As shown in FIG. 3, the light shielding unit 130 includes two light shielding plates 131 arranged at a predetermined interval on a horizontal plane above the recognition box 111. In the case of the present embodiment, by providing a rectangular hole in one plate, two light shielding plates 131 arranged at a predetermined interval are realized.

  More specifically, as shown in FIG. 6A, in the first light shielding means 130a, two light shielding plates 131 are arranged with a rectangular hole interposed therebetween. Similarly, in the second light shielding means 130b, a light shielding plate 131 wider than the light shielding plate 131 is disposed across a rectangular hole. The first light shielding means 130a and the second light shielding means 130b are integrated, and a mask 135 is formed.

  FIG. 6B shows a variation of the mask 135. The mask 135 shown here is capable of switching the four-stage light shielding range of the light shielding means 130a to 130d. Moreover, since the light shielding means are directly connected, weight reduction is achieved.

  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, as shown in FIGS. 3A, 3B, and 3C, the mask 135 is moved by the switching device 137 with respect to the light receiving element array 121, so that the light shielding means 130 is switched and the one-dimensional CCD camera 120 is switched. The range that covers a part of both ends in the main scanning direction can be changed stepwise.

  The light shielding device may be any device that does not generate charges at both ends of the light receiving element array, and may be an electronic device such as a liquid crystal shutter.

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 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. Further, the main scanning direction variable setting is a time corresponding to the optimum interval among the light shielding plates 131 of the light shielding means 130 according to the size of the electronic component P currently attracted to the transfer command signal output unit 610. A value is given, and an instruction to switch to which light shielding means is output to the light shielding plate driving circuit 693 in accordance with this value, and the number of light receiving elements to be covered in the light receiving element array 121 is controlled step by step.

  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 and detection of the amount of positional deviation.

  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. 10 is a diagram conceptually showing stored image signals.

  First, as shown in FIG. 8, the shape of the electronic component P held by the multi-mounting head 101 is acquired from the component library, and stepwise main scanning direction variable setting values and continuous sub-scanning direction variable setting values are calculated. To do. Specifically, the shortest interval among the intervals of the light shielding plates 131 provided in the plurality of light shielding units 130 is selected and calculated as the main scanning direction variable setting value, which is longer than the size of the electronic component P in the main scanning direction. Is done. 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 multi-mounting head 101 is transported to the vicinity of the imaging device 110 by the XY robot 102 (S802). More specifically, the electronic component P is disposed at the center of the one-dimensional CCD camera 120 in the main scanning direction, and the end of the electronic component P is disposed at a predetermined position near the one-dimensional CCD camera 120.

  Next, based on the main scanning direction variable setting value, the light shielding plate driving circuit 693 controls the switching device 137 to move the mask 135 to switch the light shielding means 130 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.
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).

  Electric charges are generated 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, no charge is generated (shaded 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).

  Each step of light reception → transfer → output → movement (S804 to S807) described above is repeated until the sub-scanning direction variable setting value expires, and image signals are accumulated.

However, the output image signal is as follows.
As shown in FIG. 9B, in the second and subsequent light receptions, the next charge is generated in the central portion of the light receiving element array 121 (F to J in FIG. 9), and no charge is generated at both ends (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 electric charges accumulated in the shift register 122 in synchronization with the clock signal transmitted from the clock 691 are output from the output unit 124 one by one as the image signal 700 (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, both ends of the one-dimensional CCD camera are shielded according to the size of the electronic component P to be imaged, and only the light receiving portion (with some exceptions) is received. Since it is output as an image signal, high-speed imaging can be realized. In addition, since the image of the electronic component P is picked up in the center of the one-dimensional CCD camera and in the vicinity of the central axis of the optical system, it can be picked up where the aberration is good, and a highly accurate image can be obtained.

  Further, since the light shielding range is limited to multiple stages, the light shielding range is accurate, and the interval between the light shielding plates 131 can be easily obtained, so that a highly accurate image can be obtained accurately and quickly. It becomes possible.

  The light shielding means 130 provided in the mask 135 of the present embodiment is symmetrical, that is, uniformly shields the light receiving element array 121. However, the present invention is not limited to this and is asymmetrical to the left and right. It doesn't matter. However, it is preferable that the range in which the light shielding plate 131 does not shield light is symmetrical with respect to the central axis of the optical system 125 provided in the one-dimensional CCD camera.

  The present invention can be applied to an image pickup apparatus provided with a one-dimensional CCD camera, and in particular, can be applied to an image pickup apparatus provided in a component mounting machine.

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 unit 131 light shielding plate 132 support plate 133 driving mechanism 134 motor 137 switching device 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 (2)

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 that receives each of the charges generated by the light receiving elements and outputs the received charges to an output unit;
A shift gate that permits or rejects transfer of 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;
A first light shielding means comprising two light shielding plates arranged so as to be symmetrical with respect to the central axis of the optical system at a predetermined interval for shielding both ends of the light receiving element array;
A second light-shielding means comprising two light-shielding plates arranged so as to be symmetrical with respect to the central axis of the optical system at a predetermined interval different from the first light-shielding means in a light-shielding range;
There are provided two light shielding plates arranged so that a range not shielded with respect to the central axis of the optical system is symmetrical with respect to the central axis of the optical system at a predetermined interval different from the light shielding range with the first light shielding unit and the second light shielding unit. A third light shielding means;
The second light-shielding means, the second light-shielding means, and the third light-shielding means are arranged so that the light-shielding range is symmetrical with respect to the central axis of the optical system at a predetermined interval different from the light-shielding range. A fourth light shielding means comprising a single light shielding plate;
Switching that enables switching of the four-stage light-shielding range by switching the first light-shielding means, the second light-shielding means, the third light-shielding means, and the fourth light-shielding means to change the light-shielding area of the light-receiving element array. And an imaging device. 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 that receives each of the charges generated by the light receiving elements and outputs the received charges to an output unit;
A shift gate that permits or rejects transfer of 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;
A first light-shielding means provided with two light-shielding plates that shield both ends of the light-receiving element array so that a range not shielded with respect to the central axis of the optical system is symmetrical
A second light-shielding means provided with two light-shielding plates having different light-shielding ranges from the first light-shielding means so that a range not shielded from the central axis of the optical system is symmetrical .
The two light-shielding plates arranged at predetermined intervals differing from the light-shielding range from the first light-shielding means and the second light-shielding means are provided so that the light-shielding range is symmetrical with respect to the central axis of the optical system. A third light shielding means;
The two light-shielding plates arranged at a predetermined interval differing from the light-shielding range from the first light-shielding means, the second light-shielding means, and the third light-shielding means have a left-right range that does not shield the central axis of the optical system. A fourth light-shielding means provided to be symmetrical ;
Switching that enables switching of the four-stage light-shielding range by switching the first light-shielding means, the second light-shielding means, the third light-shielding means, and the fourth light-shielding means to change the light-shielding area of the light-receiving element array. Means,
A component mounting machine comprising: moving means for moving a component perpendicular to the length direction of the light receiving element array.

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