Abstract:
A method of operating a chip mounter is provided, comprising: preparing an electronic part on a part supply unit and a printed circuit board on a main body; gripping the electronic part using a part conveyor unit to move the electronic part along a part moving path on the part supply unit and the main body; photographing the electronic part when the electronic part is located at a part recognition region within the part moving path without stoppage and during the movement of the electronic part; transmitting a photographed image of the electronic part to a controller using the image processing unit; comparing the photographed image with a reference image using the controller; and displaying the photographed image to the exterior using the controller; wherein the part recognition region is set by at least one coordinate in the controller to be located on a light source of the processing unit.

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
       [0001]    This application is a continuation application of U.S. patent application Ser. No. 12/427,074, filed Apr. 21, 2009, the disclosure of which is incorporated herein in its entirety by reference. 
     
    
     BACKGROUND 
       [0002]    The present invention relates to a chip mounter. Various embodiments of the invention relate to an electronic part recognition apparatus and a chip mounter having the same that are capable of photographing images of an electronic part while the electronic part is suctioned by a nozzle installed in a head, without stoppage of the head as it moves to a mounting position. 
         [0003]    In general, a chip mounter is an apparatus for mounting electronic parts such as semiconductor packages on a printed circuit board (PCB). 
         [0004]    In recent times, substrates have become dense and highly functional, and therefore, individual integrated circuit parts have also become highly functional. As a result, the number of output pins mounted on the substrate is increased and intervals between the output pins are reduced. 
         [0005]    Therefore, before mounting electronic parts on a substrate, the parts must be rotated to accurate angles to be precisely mounted. 
         [0006]    In order to precisely mount a part supplied from a part supply portion at a predetermined position on the substrate, a suction state and a center position of the part must be accurately recognized. For this purpose, an electronic part recognition apparatus is used. 
         [0007]    The part recognition apparatus includes a camera for recognizing parts and an illumination system. The camera may include a line scan camera and an area scan camera, and the illumination system may be a bright field illumination system. 
         [0008]    Among these, the area scan camera uses the bright field illumination system, and since the electronic part is photographed in a stopped state, exposure time may be lengthened. 
         [0009]    In addition, the illumination system mounted on the area scan camera requires light intensity that can be provided for a long exposure time, rather than excessive brightness. Therefore, the illumination system applied to the area scan camera is vulnerable to overheating. 
         [0010]    Here, since the chip mounter can increase productivity when the parts are mounted at the shortest distance, while the nozzle suctions the electronic part and moves it from a pick-up position to a mounting position, the mounting state of the electronic part must be recognized to perform optimal mounting. 
         [0011]    However, since a timing operation of the conventional camera is very long, an image capture operation is very difficult to perform. 
       SUMMARY 
       [0012]    An exemplary embodiment of the invention provides an electronic part recognition apparatus and a chip mounter having the same that are capable of photographing images of an electronic part while the electronic part is suctioned by a nozzle installed in a head, without stoppage of the head as it moves to a mounting position. 
         [0013]    Another exemplary embodiment of the invention provides an electronic part recognition apparatus and a chip mounter having the same that are capable of recognizing an electronic part using multi-array light sources at various angles while the part is suctioned by a nozzle and moved. 
         [0014]    Still another exemplary embodiment of the invention provides an electronic part recognition apparatus and a chip mounter having the same that are capable of turning on multi-array light sources optimized to recognize an electronic part, and recognizing mirror-surface parts by differentiating positions and light intensities of the light sources arrayed depending on characteristics of the part in an illumination system using the multi-array light sources. 
         [0015]    Yet another exemplary embodiment of the invention provides an electronic part recognition apparatus and a chip mounter having the same that are capable of shortening a light exposure time of an electronic part to 50˜60 μs while the part is suctioned by a nozzle and moved, and performing instant channel-specific lighting in order to provide sufficient light intensity for the short exposure time. 
         [0016]    One aspect of the invention is directed to an electronic part recognition apparatus including: a part conveyor unit for moving an electronic part along a part moving path and mounting the part at a mounting position; a position recognition portion for continuously recognizing position information of the part conveyor unit moving along the part moving path; a controller for receiving the position information from the position recognition portion and generating a photographing signal; and an image processing unit for receiving the photographing signal from the controller and exposing the electronic part to light for a certain time to photograph an image of the electronic part when the electronic part is located at a part recognition region while the part conveyor unit moves. 
         [0017]    Here, the image processing unit may include a light source disposed adjacent to the part recognition portion and emitting light at a certain illuminance or more; and an image photographer electrically connected to the controller, photographing an image of the electronic part exposed to the light for the certain time, and transmitting the photographed image to the controller. 
         [0018]    In addition, the controller may generate the photographing signal to turn on the light source for a certain time, and the part recognition region may be set in the controller. 
         [0019]    Further, the part conveyor unit may include a nozzle module disposed on the part moving path and gripping the electronic part by suction provided from the exterior; and a conveyor connected to the nozzle module, continuously moving the nozzle module along the part moving path, and transmitting the position information within the part recognition region to the controller. 
         [0020]    Here, the position recognition portion may be an encoder installed at the conveyor and transmitting moving position information of the conveyor to the controller as an electrical signal. 
         [0021]    In addition, the controller may set a light exposure time determined by opening and closing a shutter as 50˜60 μs. 
         [0022]    Further, the controller may be electrically connected to optical sensors for measuring intensity of light emitted from the light source and transmitting the measured light intensity to the controller, and the controller may control operation of the light source such that the measured light intensity falls within a predetermined reference light intensity range. 
         [0023]    Furthermore, the light source may include a side illumination portion installed to help illumination provided at a lead and a ball of the electronic part, and first and second illumination portions installed to help illumination provided at a center portion of the electronic part. 
         [0024]    In addition, the light source may be installed at an illumination unit to provide flash illumination, and the illumination unit may further include a radiation portion for radiating heat generated by the light source. 
         [0025]    Further, the radiation portion may include a radiation cover disposed in front of the light source, a radiation plate disposed behind the light source, and a radiation fan installed adjacent to the radiation plate and electrically connected to the controller. 
         [0026]    Furthermore, the radiation portion may further include a temperature sensor disposed adjacent to the light source, measuring a temperature adjacent to the light source, and transmitting the measured temperature to the controller, and the controller may control operation of the radiation portion such that the temperature falls within the reference temperature range. 
         [0027]    In another aspect, the invention is directed to a chip mounter having an electronic part recognition apparatus. The chip mounter includes: a main body having a mounting position of the electronic part and a part moving path along which the electronic part moves to the mounting position; a part supply unit installed at the main body and supplying the moving electronic part; a part conveyor unit installed at the main body and receiving the electronic part from the part supply unit to move the electronic part along the part moving path to the mounting position and mount the electronic part; a position recognition portion for continuously recognizing position information of the part conveyor unit moving along the part moving path; a controller for receiving the position information from the position recognition portion and generating a photographing signal; and an image processing unit for receiving the photographing signal from the controller and exposing the electronic part to light for a certain time to photograph an image of the electronic part when the electronic part is located at a part recognition region while the part conveyor unit moves. 
         [0028]    Here, the image processing unit may include a light source disposed adjacent to the part recognition portion and emitting light at a certain illuminance or more; and an image photographer electrically connected to the controller, photographing an image of the electronic part exposed to the light for the certain time, and transmitting the photographed image to the controller. 
         [0029]    In addition, the controller may generate the photographing signal to turn on the light source for a certain time, and the part recognition region may be set in the controller. 
         [0030]    Further, the part conveyor unit may include a nozzle module disposed on the part moving path and gripping the electronic part by suction provided from the exterior; and a conveyor connected to the nozzle module, continuously moving the nozzle module along the part moving path, and transmitting the position information within the part recognition region to the controller. 
         [0031]    Here, the position recognition portion may be an encoder installed at the conveyor and transmitting moving position information of the conveyor to the controller as an electrical signal. 
         [0032]    In addition, the controller may set a light exposure time determined by opening and closing a shutter as 50˜60 μs. 
         [0033]    Further, the controller may be electrically connected to optical sensors for measuring intensity of light emitted from the light source and transmitting the measured light intensity to the controller, and the controller may control operation of the light source such that the measured light intensity falls within a predetermined reference light intensity range. 
         [0034]    Furthermore, the light source may include a side illumination portion installed to help illumination provided at a lead and a ball of the electronic part, and first and second illumination portions installed to help illumination provided at a center portion of the electronic part. 
         [0035]    In addition, the light source may be installed at an illumination unit to provide flash illumination, and the illumination unit may further include a radiation portion for radiating heat generated by the light source. 
         [0036]    Further, the radiation portion may include a radiation cover disposed in front of the light source, a radiation plate disposed behind the light source, and a radiation fan installed adjacent to the radiation plate and electrically connected to the controller. 
         [0037]    Furthermore, the radiation portion may further include a temperature sensor disposed adjacent to the light source, measuring a temperature adjacent to the light source, and transmitting the measured temperature to the controller, and the controller may control operation of the radiation portion such that the temperature falls within the reference temperature range. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0038]    The foregoing and other objects, features and advantages of various embodiments of the invention will be apparent from the more particular description of an exemplary embodiment of the invention illustrated in the accompanying drawing. The drawing is not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. 
           [0039]      FIG. 1  is a perspective view of a chip mounter having an electronic part recognition apparatus in accordance with an exemplary embodiment of the present invention; 
           [0040]      FIG. 2  is a view showing photographing of an electronic part disposed on a part recognition region of  FIG. 1 ; 
           [0041]      FIG. 3  is a perspective view of the electronic part recognition apparatus of  FIG. 1 ; 
           [0042]      FIG. 4  is a perspective view showing the interior of the electronic part recognition apparatus of  FIG. 3 ; 
           [0043]      FIG. 5  is a perspective view of a light source of  FIG. 4 ; 
           [0044]      FIG. 6  is a block diagram showing operation of an image processing unit in accordance with an exemplary embodiment of the present invention; 
           [0045]      FIG. 7  is a view showing an image processing unit in accordance with another exemplary embodiment of the present invention; and 
           [0046]      FIG. 8  is a view showing operation of the image processing unit of  FIG. 7 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0047]    The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. 
         [0048]    Referring to  FIG. 1 , the chip mounter in accordance with an exemplary embodiment of the present invention includes a main body  100 . The main body  100  has a mounting position P 2  of an electronic part  50  mounted on a printed circuit board P. Here, the printed circuit board P may be moved to the mounting position P 2  of the main body  100  by a conveyor apparatus (now shown). 
         [0049]    In addition, a part supply unit  200  is installed at the main body  100  to supply the electronic part  50 . The part supply unit  200  may be a tape feeder, and can sequentially supply a certain number of electronic parts  50  to a pick-up position P 1 . 
         [0050]    Further, a part conveyor unit  300  is installed at the main body  100 . Apart moving path a formed at the main body  100  is a path for connecting the pick-up position P 1  and the mounting position P 2 . Therefore, the part conveyor unit  300  can grip the electronic part  50  loaded to the pick-up position P 1  by suction provided from the exterior and convey it to the mounting position P 2  along the part moving path a. 
         [0051]    That is, the part conveyor unit  300  can receive the electronic part  50  from the part supply unit  200 , and move the electronic part  50  along the part moving path a to the mounting position P 2  and mount the electronic part  50 . 
         [0052]    The part conveyor unit  300  includes a conveyor  320  such as a gentry disposed at the main body  100 , and a nozzle module  310  such as a head connected to the conveyor  320  and moving along X-, Y- and Z-axis by operation of the conveyor  320  to grip the electronic part  50 . Here, the conveyor  320  may include X-, Y- and Z-axis moving portions  321 ,  322  and  323  for moving the nozzle module  310 . 
         [0053]    In addition, the conveyor  320  has a position recognition portion (not shown) for continuously recognizing position information of the nozzle module  310  moved along the part moving path a. 
         [0054]    Further, the X- and Y-axis moving portions  321  and  322  may include X- and Y-axis motors  321   a  and  322   a  such as linear motors for moving the nozzle module  310 , respectively, and the Z-axis moving portion  323  may be an apparatus for vertically adjusting the position of the nozzle module  310  along a Z-axis, for example, an actuator. 
         [0055]    Furthermore, the X- and Y-axis motors  321   a  and  322   a  may include encoders (not shown) for generating electric signals depending on movement of the nozzle module  310 , respectively. 
         [0056]    In addition, the nozzle module  310  may receive suction from the exterior to suction one surface of the electronic part  50 . Here, whether the electronic part  50  is suctioned by the nozzle module  310  or not may be determined by formation or release of the suction in the nozzle module  310 . 
         [0057]    Further, the chip mounter in accordance with an exemplary embodiment of the present invention includes a controller  900  for receiving a signal of the position information from the position recognition portion and generating a photographing signal, and an image processing unit  400  for receiving the photographing signal from the controller  900 , and exposing the electronic part to light for a certain time to photograph an image of the electronic part  50  when the electronic part  50  is disposed at a part recognition region A during movement of the part conveyor unit  300 . 
         [0058]    Specifically, the image processing unit is installed at the main body  100  under the part conveyor unit  300 , and electrically connected to the part conveyor unit  300 . 
         [0059]    Here, the image processing unit  400  can receive the photographing signal from the controller  900  when the electronic part  50  is located at the part recognition region A during movement of the electronic part  50  along the part moving path a, and expose the electronic part  50  to light for a certain time to photograph an image of the electronic part  50 . 
         [0060]    In addition, as shown in  FIGS. 1 and 2 , the part recognition region A may be located on the part moving path a, and may have a certain area. The region area of the part recognition region A may have position information constituted by four coordinates. Here, the part recognition region A may be an inner region of lines for connecting the position information (X 1 , Y 1 ), (X 2 , Y 2 ), (X 3 , Y 3 ) and (X 4 , Y 4 ). 
         [0061]    Of course, the part recognition region A may be formed of single position information. 
         [0062]    The constitution of the image processing unit  400  will be described in detail below with reference to  FIGS. 3 to 6 . 
         [0063]    Referring to  FIGS. 3 and 4 , the image processing unit  400  includes a light source  410  and an image photographer  430 . 
         [0064]    The light source  410  may be installed in the main body  100  (see  FIG. 1 ) to be located under the part recognition region A (see  FIGS. 1 and 2 ), and may emit light having a certain illuminance or more onto the part recognition region A. Preferably, the illuminance may be 400,000 Lux or more. In addition, the emitted light may be flash illumination. 
         [0065]    The light source  410  is installed at an illumination unit  460 . The illumination unit  460  has a frame shape for defining a certain space. Here, the light source  410  is disposed at four inner surfaces of an upper end of the illumination unit  460 . That is, the light source  410  has four channels as shown in  FIG. 5 . 
         [0066]    Referring to  FIG. 5 , the light source  410  corresponding to each channel includes a side illumination portion  413 , and first and second inclination illumination portions  411  and  412  disposed under the side illumination portion  413 . Here, the side illumination portion  413  and the first and second illumination portions  411  and  412  are constituted by a plurality of light emitting diodes. The light emitting diodes may be arranged such that the number of the light emitting diodes is gradually reduced from the side illumination portions  413  to the second inclination illumination portion  412 . 
         [0067]    Here, the side illumination portion  413  may support illumination provided at a lead and a ball of the electronic part  50  positioned at the part recognition region A (see  FIG. 2 ). In addition, the first and second inclination illumination portions  411  and  412  may support illumination provided at side surfaces of a center portion of the electronic part  50 . 
         [0068]    In addition, referring to  FIGS. 5 and 6 , the illumination unit  460  may further include a radiation portion  500  for radiating heat generated by the light source  410 . 
         [0069]    Here, the radiation portion  500  may include a radiation cover  510  disposed in front of the light source  410 , a radiation plate  520  disposed behind the light source  410 , and a radiation fan  530  installed adjacent to the radiation plate  520  and electrically connected to the controller  900 . 
         [0070]    Meanwhile, the controller  900  may be electrically connected to the light source  410 , receive a nozzle module moving signal (formed of position information), and turn on the light source  410  for a certain time. 
         [0071]    That is, the part recognition region A may be set in the controller  900 . In addition, the part recognition region A may be set by several coordinates having a plurality of position information to form a certain area, or single coordinates as position information. 
         [0072]    Therefore, the controller  900  can transmit the photographing signal to the light source  410  when the moving signal is included in the set part recognition region A. 
         [0073]    In addition, the controller  900  may set a light exposure time of the electronic part as 50 to 60 μs. 
         [0074]    Referring to  FIGS. 7 and 8 , the image processing unit  400  may include a shutter  440  and a shutter driver  450 . 
         [0075]    In this case, the shutter  440  is disposed adjacent to the light source  410  and can selectively transmit light emitted from the light source  410  to the exterior. The shutter  440  may be connected to an apparatus such as an iris. 
         [0076]    The shutter driver  450  can open and close the shutter  440  to selectively expose the part recognition region A to the light emitted from the light source. 
         [0077]    The controller  900  is electrically connected to the light source  410  and the shutter driver  450 . Here, the controller  900  can turn on the light source  410 , receive a moving signal from the position recognition portion, and open and close the shutter  440  using the shutter driver  450  for a certain time. 
         [0078]    As shown in  FIGS. 7 and 8 , the image photographer  430  may be electrically connected to the controller  900 , photograph an image of the electronic part  50  exposed to the light, and transmit the photographed image to the controller  900 . 
         [0079]    Meanwhile, referring to  FIG. 4 , the image photographer  430  may be a scan camera which is connected to the illumination unit  460 . Here, the illumination unit  460  may further include a coaxial illumination portion  800 . The coaxial illumination portion  800  includes light emitting diodes used as coaxial illumination. Here, a mirror (not shown) may be installed in an inner space of the illumination unit  460 , in which the coaxial illumination portion  800  is disposed, to reflect the image of the electronic part  50  exposed to the light and guide the reflected image to the image photographer  430 . In addition, a radiation fan  810  is further installed at the illumination unit  460  in which the coaxial illumination portion  800  is disposed. 
         [0080]    Meanwhile, the illumination unit  460  further includes optical sensors  700  installed in an inner space thereof. The optical sensors  700  can measure intensity of light emitted from the light source  410  and transmit the measured light intensity to the controller  900 . Here, the controller  900  can control operation of the light source such that the measured light intensity falls within a predetermined reference light intensity range. 
         [0081]    In addition, the radiation portion  500  is disposed adjacent to the light source  410 . The radiation portion  500  includes temperature sensors  600  for measuring a temperature around the light source  410  and transmitting the measured temperature to the controller  900 . Here, the controller  900  can control operation of the radiation fans  530  and  810  such that the measured temperature is included in a predetermined reference temperature range. 
         [0082]    Further, the image photographer  430 , in accordance with an exemplary embodiment of the present invention, may further include a display device  470  electrically connected to the controller  900 . Here, the display device  470  can display the image of the electronic part  50  photographed at the part recognition region A from the controller  900  as visual information. Furthermore, the controller  900  may have a reference image set to inspect misalignment of the electronic part  50  suctioned by the nozzle module  410 . Therefore, the controller  900  can determine whether the image of the electronic part  50  is equal to a reference image, and then, display the image through the display device  470  to the exterior. 
         [0083]    In addition, the display device  470  can display a temperature measured by the temperature sensor  600  and light intensity measured by the optical sensors  700 . 
         [0084]    Further, the display device  470  can display a camera exposure time and illuminance set by the controller  900 . 
         [0085]    Furthermore, the controller  900  may further include an input device (not shown) for selectively inputting the reference temperature range, the reference light intensity range, the camera exposure time, and the illuminance. 
         [0086]    Operation of the electronic part recognition apparatus and the chip mounter having the same in accordance with an exemplary embodiment of the present invention will be described below. 
         [0087]    Referring to  FIGS. 1 and 2 , the part supply unit  200  sequentially supplies a plurality of electronic parts  50  to the pick-up position P 1 . 
         [0088]    Then, the conveyor  300  moves the nozzle module  310  to the pick-up position P 1 . A Z-axis conveyance portion  330  of the conveyor  300  lowers the nozzle module  310  to grip the electronic part  50 . The conveyor  300  moves the nozzle module  310  along the part moving path a to the mounting position P 2  where the printed circuit board P is located. Therefore, the electronic part  50  suctioned by the nozzle module  310  is conveyed along the part moving path a. 
         [0089]    At this time, the position recognition portions (not shown) attached to the X-axis motor  321   a  and the Y-axis motor  322   a  of the conveyor  300  recognize moving signals (constituted by position information) of the nozzle module  310 . 
         [0090]    The position recognition portion transmits a moving signal as an electrical signal generated upon conveyance of the nozzle module  310  to the controller  900  of the image processing unit  400 . Therefore, the controller  900  can recognize moving position information (coordinates) of the conveyed nozzle module  310  in real time. 
         [0091]    In addition, the controller  900  can generate a photographing signal to the light source  410  of the image processing unit  400 , when the real time position information is located at the part recognition region A formed of a plurality of coordinates. Here, the photographing signal is an operation signal of the light source  410 . Therefore, the light source  410  can be instantly operated. Here, the controller  900  sets an operation time of the light source  410  to 50 to 60 μs, and illuminance of flash illumination emitted from the light source  410  to 400,000 Lux. 
         [0092]    Therefore, the controller  900  controls such that light emitted from the light source  410  is radiated onto the part recognition region A for 50 to 60 μs only. 
         [0093]    As a result, while the nozzle module  310  suctions the electronic part and conveys it along the part moving path a, when the nozzle module  310  passes through the part recognition region A without stoppage, it is possible to expose the electronic part  50  suctioned by the nozzle module  310  to the light emitted from the light source  410  for 50 to 60 μs to photograph an image of the electronic part  50 . 
         [0094]    Here, the 50 to 60 μs may be conventional camera exposure time. Preferably, the image photographer  430  can photograph the image of the electronic part  50  suctioned by the nozzle module during movement of the electronic part  50  for 10 to 40 μs and transmit it to the controller  900 . 
         [0095]    The light emitted from the light source  410  may be constituted by the following four channels. 
         [0096]    A bright field illumination system is used for illumination by light, and a dark field illumination system is used for recognition of a mirror-surface part such as a glittering part. In order to recognize a lead surface of the electronic part  50  or obtain sufficient image brightness for a short exposure time upon recognition of the electronic part such as a ball or a chip, a high-brightness illumination system is needed. At this time, the bright field illumination system is used to directly emit a sufficient amount of light. 
         [0097]    In addition, since the image photographer  430  such as a scan camera electrically connected to the controller  900  is in an ON state, when the electronic part  50  is exposed to light, the image of the electronic part  50  can be photographed by the image photographer  430 . 
         [0098]    Then, the image photographer  430  transmits the image of the photographed electronic part to the controller  900  as an electrical signal. 
         [0099]    As described above, when the controller  900  controls the light source  410  to be operated for an exposure time only, since the light is instantly emitted for 50 to 60 μs only, a temperature in the illumination unit  460  may not increase beyond a certain temperature and the illumination unit  460  may not continuously generate heat for a certain time or more. Therefore, the illumination unit  460  having the light source  410  may not include a separate radiation structure. 
         [0100]    The light exposure time for photographing an image of the electronic part  50  may be set by the shutter  440  and the shutter driver  450 . 
         [0101]    In this case, when the nozzle module  310  to which the electronic part  50  is suctioned is located at the part recognition region A provided on the part moving path a by the conveyor  300 , the controller  900  can open the shutter  440  using the shutter driver  450  for 50 to 60 μs. At this time, the light source  410  may be in a light-emitting state, and the image photographer  430  may also be in an operating state. 
         [0102]    Therefore, the light emitted from the light source  410  can illuminate the electronic part  50  located at the part recognition region A during an opening time of the shutter  440 , and an image of the illuminated electronic part  50  can be photographed by the image photographer  430 . Then, the image photographer  430  can transmit the photographed image to the controller  900 . 
         [0103]    In this case, the illumination unit  460  having the light source  410  installed therein may heat up to a certain temperature or more. 
         [0104]    At this time, the temperature sensor  600  installed at the illumination unit  460  can measure the temperature in the illumination unit  460  and transmit the measured temperature to the controller  900 . Here, the controller  900  sets a reference temperature range. 
         [0105]    In addition, the controller  900  can operate the radiation fans  530  and  810  such that the measure temperature falls within the reference temperature range. Therefore, the illumination unit  460  may be cooled to maintain a certain temperature by operation of the radiation fans  530  and  810 . 
         [0106]    Further, referring to  FIG. 3 , the radiation cover  510  has a plurality of radiation slits  510   a . Therefore, the illumination unit  460  may be readily cooled by the radiation slits  510   a , the radiation cover  510  and the radiation plate  520 . 
         [0107]    When the electronic part  50  located at the part recognition region A is exposed to the light emitted from the light source  410  for 50 to 60 μs, it is possible to uniformly maintain the light intensity. 
         [0108]    That is, the optical sensor  700  is installed in the illumination unit  460 . The optical sensor  700  measures the intensity of light emitted from the light source  410  and transmits it to the controller  900 . Here, the controller  900  sets a reference light intensity range. 
         [0109]    In addition, the controller  900  can operate the light source  410  such that the measured light intensity falls within the reference light intensity range. 
         [0110]    As can be seen from the foregoing, an electronic part recognition apparatus in accordance with an exemplary embodiment of the present invention can capture an image of an electronic part suctioned by a nozzle installed in a head of a chip mounter and moved without stoppage of the head to recognize a state of the suctioned electronic part, thereby readily controlling the chip mounter and reducing a process time. 
         [0111]    In addition, it is possible to recognize the electronic part using multi-array light sources at various angles while the part is suctioned by a nozzle and moved. 
         [0112]    Further, it is possible to turn on multi-array light sources optimized to recognize the electronic part and to recognize mirror-surface parts by differentiating positions and light intensities of the light sources arrayed depending on characteristics of the part in an illumination system using the multi-array light sources. 
         [0113]    Furthermore, it is possible to shorten a light exposure time of the electronic part to 50˜60 μs while the part is suctioned by a nozzle and moved, and perform instant channel-specific lighting in order to provide sufficient light intensity for the short exposure time. 
         [0114]    The system or systems may be implemented on any form of computer or computers and the components may be implemented as dedicated applications or in client-server architectures, including a web-based architecture, and can include functional programs, codes, and code segments. Any of the computers may comprise a processor, a memory for storing program data and executing it, a permanent storage such as a disk drive, a communications port for handling communications with external devices, and user interface devices, including a display, keyboard, mouse, etc. When software modules are involved, these software modules may be stored as program instructions or computer readable codes executable on the processor on a computer-readable media such as read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. This media can be read by the computer, stored in the memory, and executed by the processor. 
         [0115]    For the purposes of promoting an understanding of the principles of the invention, reference has been made to the preferred embodiments illustrated in the drawings, and specific language has been used to describe these embodiments. However, no limitation of the scope of the invention is intended by this specific language, and the invention should be construed to encompass all embodiments that would normally occur to one of ordinary skill in the art. 
         [0116]    The present invention may be described in terms of functional block components and various processing steps. Such functional blocks may be realized by any number of hardware and/or software components configured to perform the specified functions. For example, the present invention may employ various integrated circuit components, e.g., memory elements, processing elements, logic elements, look-up tables, and the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. Similarly, where the elements of the present invention are implemented using software programming or software elements the invention may be implemented with any programming or scripting language such as C, C++, Java, assembler, or the like, with the various algorithms being implemented with any combination of data structures, objects, processes, routines or other programming elements. Furthermore, the present invention could employ any number of conventional techniques for electronics configuration, signal processing and/or control, data processing and the like. The words “mechanism” and “element” are used broadly and are not limited to mechanical or physical embodiments, but can include software routines in conjunction with processors, etc. 
         [0117]    The particular implementations shown and described herein are illustrative examples of the invention and are not intended to otherwise limit the scope of the invention in any way. For the sake of brevity, conventional electronics, control systems, software development and other functional aspects of the systems (and components of the individual operating components of the systems) may not be described in detail. Furthermore, the connecting lines, or connectors shown in the various figures presented are intended to represent exemplary functional relationships and/or physical or logical couplings between the various elements. It should be noted that many alternative or additional functional relationships, physical connections or logical connections may be present in a practical device. Moreover, no item or component is essential to the practice of the invention unless the element is specifically described as “essential” or “critical”. 
         [0118]    The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural. Furthermore, recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. Finally, the steps of all methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. Numerous modifications and adaptations will be readily apparent to those skilled in this art without departing from the spirit and scope of the present invention.