JP4801631B2 - Measuring apparatus and measuring system - Google Patents

Description

  The present invention relates to a measuring apparatus and a measuring system.

  2. Description of the Related Art Conventionally, optical measuring devices that detect an object to be detected using detection light are widely known. In this type of apparatus, a one-dimensional or two-dimensional image sensor is used on the light receiving side depending on the application.

  In such an optical measurement apparatus, it is necessary to perform a so-called optical axis adjustment operation (operation for aligning the direction of the light projecting side and the light receiving side) prior to performing the measurement. When performing the optical axis adjustment work, if the light-receiving surface on the light-receiving side is composed of a two-dimensional image sensor, the light on the light-projecting side is incident on the imaging surface even if the direction of the detection optical axis is tilted to some extent. Since the light receiving spot is formed, there is an advantage that it is easy to grasp the position of the detection optical axis when the optical axis adjustment operation is advanced.

  On the other hand, since a two-dimensional image sensor has a large number of pixels, it is easy to generate useless pixels for measurement where a light receiving spot does not hit, and it takes time to read out signals. Therefore, in applications where high-speed processing is required and detection is possible with a one-dimensional image sensor, it is preferable to use a one-dimensional image sensor from the viewpoint of measurement.

  Therefore, when both the response to the high-speed processing and the workability of optical axis adjustment are required, a one-dimensional image sensor and a two-dimensional image sensor may be used in combination.

An optical measuring device including both a one-dimensional image sensor and a two-dimensional image sensor is disclosed in the following patent document. If this is used, it is possible to meet the above request.
JP 2002-1116013 A

In the above configuration, since both a one-dimensional image sensor and a two-dimensional image sensor are provided, the number of parts increases and the cost increases.
The present invention has been completed based on the above-described circumstances, and is capable of responding to a request for speeding up processing and a request for facilitating optical axis adjustment without increasing the number of parts. An object is to provide an apparatus and a measurement system using the apparatus.

  The measuring apparatus according to the present invention includes a plurality of light receiving elements arranged in a two-dimensional manner, and can read a received light signal by designating an arbitrary read line among read lines arranged in the same direction. A light receiving unit having an image pickup unit, a light projecting unit forming a detection optical axis that emits detection light and detects an object to be detected together with the light receiving unit, and a signal for reading a light reception signal from the light receiving element forming the image pickup unit A reading means; a detection range setting means for setting a light receiving element on one line out of all the reading lines of the imaging unit as a detection range based on an instruction from an external device; and a preparation mode for setting the detection range; A mode switching means for switching the mode to a measurement mode for performing measurement based on the light receiving elements constituting the set detection range, and a control means for giving a read command to the signal reading means And a measuring means, wherein the control means, when the preparation mode is selected, reads out the signal read command to read out the light reception signals of a plurality of continuous readout lines. And when the measurement mode is selected, the detection range setting unit is configured to output a light reception signal of each readout line read by the signal readout unit to an external display device. The signal reading means is given a read command to read out only the light receiving signal within the detection range set by the measuring means, and the measuring means inputs the level of each light receiving signal read through the signal reading means in the measurement mode. By performing the process of detecting whether the light level or the light shielding level, the level of the received light signal is changed from the incident light level to the light shielding level on the detection range. There has characterized in that output by measuring the input light shielding position switch from shading level to the light input level.

  In the present invention, an image pickup unit composed of a plurality of light receiving elements arranged two-dimensionally is used depending on the mode. That is, the imaging unit is used two-dimensionally in the preparation mode, and the imaging unit is used one-dimensionally in the measurement mode. Therefore, since only one imaging unit is required, the number of components is not increased, and both the two-dimensional advantage (easiness of optical axis adjustment work) and the one-dimensional advantage (high-speed processing) are exhibited together. Is possible. Further, in the present invention, by performing an instruction via an external device, one line of light receiving elements can be selected as a detection range from all the readout lines of the imaging unit, and the following advantages are also obtained.

  For example, in order to align the light receiving spot with a fixed one-dimensional detection range that is fixedly set, it is necessary to finely adjust the directions of the light projecting side and the light receiving side. Such fine adjustment work relies heavily on the experience and familiarity of the operator. If the experience is inexperienced, it usually takes time and deteriorates workability.

  In this regard, in the present invention, since the detection range can be selected by giving an instruction via an external device, rough optical axis adjustment is necessary to perform alignment so that the light receiving spot is not removed from the imaging unit. However, if a light receiving spot enters the imaging unit, the detection range can be set accordingly. Therefore, the fine adjustment work can be eliminated and the optical axis adjustment work can be greatly simplified. In this case, the operation itself of setting the detection range according to the position of the light receiving spot is necessary. However, since the detection range can be set by a key operation or the like, compared with fine adjustment of the optical axis. It is very easy to implement.

The following configuration is more preferable as an embodiment of the present invention.
The light receiving unit includes a two-dimensional CMOS image sensor as the imaging unit, and a condensing lens that enters the detection light while condensing the detection light on the CMOS image sensor. A CMOS (Seamos) image sensor can be used as it is, and is advantageous in terms of cost.

The detection range setting means sets a part of the light receiving elements among all the light receiving elements located on the same line along the reading direction as a detection range based on an instruction from an external device. In this way, it is possible to set only the light receiving elements necessary for measurement as the detection range.

In the case where the external device is removable from the measuring device, the detection range setting unit changes the setting of the detection range only based on an instruction from the external device. In this way, if the external device is removed from the measuring device after the detection range setting work is completed, the set detection range is set unless the external device is connected again and the detection range is reset. Therefore, it is possible to prevent the detection range from being changed unexpectedly.

A non-volatile storage means and a storage control means for storing the detection range set by the detection range setting means in the storage means are provided, and the detection range setting means is provided on condition that power is turned on again. The detection range is rewritten to the detection range stored in the storage unit. If the non-volatile storage means is not provided here, when the setting of the detection range has returned to the initial state due to the turning on / off of the power, it is necessary to reset the detection range. With this configuration, when the power is turned on again, the detection range setting means automatically rewrites the detection range to the detection range stored in the storage means. Therefore, it is not necessary for the operator to perform the resetting work, which is easy to use.

-When the preparation mode is selected, the control means reads out the signal reading means together with the position information of the detection range every time the detection range is changed by the detection range setting means. The received light signal of each readout line is output to the external display device. In this way, both the received light image and the detection range can be displayed on the display screen of the display device.

  The present invention is a measurement system for detecting the posture of a moving moving object, wherein the light projecting means and the light projecting means are sandwiched between the moving path so that a detection optical axis intersects the moving path of the moving object. The measuring apparatus according to any one of claims 1 to 6, wherein a light receiving means is disposed opposite to the light receiving means, and an attitude for detecting an attitude of the moving object based on the incident / shielding position output from the measuring means of the measuring apparatus. And a detection device. Since this system can perform high-speed processing, the posture of a moving object that moves at a certain high speed can be detected without any problem.

  The present invention is a measurement system comprising the measurement device according to claim 6, a display device, and an external setting device as the external device, wherein the external setting device performs a setting change operation on the detection range. The setting operation unit is configured to transmit the instruction corresponding to the operation of the setting operation unit to the detection range setting unit of the measurement apparatus, and the preparation mode is selected as the detection range setting unit of the measurement apparatus. When the preparation mode is selected, the control means of the measuring device performs a process of changing the setting of the detection range based on the instruction. Each time the setting is changed, together with the position information of the detection range, the light reception signal of each readout line read by the signal readout means is output to the external display device, The display device simultaneously displays a light reception image representing the level of the light reception signal level of each readout line as an image and the detection range on the display screen so that the relative positional relationship between them can be visually observed. It has a feature to be displayed. In this system, both the received light image and the detection range are displayed on the display screen of the display device at the same time so that the relative positional relationship between them can be visually observed. If the detection range is set with reference, the detection range can be accurately set at the center of the received light image.

  According to the present invention, the image pickup unit composed of a plurality of light receiving elements arranged two-dimensionally is used properly in accordance with the mode. That is, the imaging unit is used two-dimensionally in the preparation mode, and the imaging unit is used one-dimensionally in the measurement mode. Therefore, since only one imaging unit is required, the number of components is not increased, and both the two-dimensional advantage (easiness of optical axis adjustment work) and the one-dimensional advantage (high-speed processing) are exhibited together. Is possible.

An embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the measuring apparatus 50 according to the present invention is mounted on a component mounter 10. The component mounting machine 10 is provided with a substrate transporting conveyor 15 at the center of the base 11, and after mounting the image F to be mounted on the base 11, it is stopped at a work position near the center of the base. It is like that.

  A component supply unit 16 is provided on the lower side of FIG. A large number of feeders 40 are installed side by side in the component supply unit 16. The feeder 40 has a function of supplying a component W mounted on the board F.

  In addition, a pair of guide rails 21 are installed on both the left and right sides of the base 11 with a work position interposed therebetween, and a head support 22 is installed with the guide rails 21 extending from side to side. The head support 22 is configured to be movable in the vertical direction in FIG. 1 along the left and right guide rails 21.

  A head unit 30 is attached to the head support 22. The head unit 30 is configured to be movable in the longitudinal direction of the head support 22. Accordingly, the head unit 22 is moved in the left-right direction along the head support 22 while moving the head support 22 in the up-down direction along the guide rail 21, so that the head can be placed at an arbitrary position on the base 11. The unit 30 can be moved horizontally.

  A suction head 31 is attached to the lower surface of the head unit 30 so as to protrude downward (omitted in FIG. 1, see FIG. 2). The suction head 31 is configured to be movable up and down with respect to the head unit 30, and a suction nozzle 35 is provided at the tip. A negative pressure is supplied to the suction nozzle 35 from a negative pressure means (not shown) to generate a suction force at the tip of the head.

  By configuring as described above, the part W on the feeder 40 can be taken out in the following manner. First, the head unit 30 is moved onto the feeder 40 and stopped above the feeder 40 (position (A) shown in FIG. 1).

  Thereafter, the suction head 31 is lowered, and negative pressure is supplied to the suction head 31 in accordance with the lowering timing. Thereby, the component W supplied through the feeder 40 can be sucked and held by the suction head 31.

  Thereafter, if the suction head 31 in the lowered state is raised, the component W held by suction rises together with the suction head 31. Thus, the part W is taken out from the feeder 40.

  When the work for taking out the component W is completed, a process of moving the head unit 30 located above the feeder toward the upper side of the substrate F stopped at the work position is then performed in order to mount the component on the substrate F. Is called.

  Accordingly, in the example of FIG. 1, the head unit 30 holding the component W moves to the upper side of the paper of FIG. 1 on the back side of the base, but this embodiment will be described later in the movement process. When the component W sucked and held at the tip of the suction head 31 crosses the detection optical axis L of the measuring device 50 (see FIG. 2), the posture of the component W sucked and held by the suction head 31 is inspected (hereinafter, both detected) It is configured to say.

  If there is no abnormality in the component posture as a result of the inspection, the component mounting process by the head unit 30 is advanced, and the component W is mounted on the substrate F that stops at the work position.

Next, the measuring apparatus 50 will be described.
The measuring device 50 includes a light projecting unit 60 that emits detection light and a light receiving unit 70 that receives the emitted detection light. Both units 60 and 70 are ones in which various devices are built in casings 61 and 71.

  As shown in FIG. 3, the light projecting unit 60 includes a light projecting element 62 such as a laser diode. The light projecting unit 60 is electrically connected to the light receiving unit 70 and is configured to drive the light projecting element 62 and emit detection light in accordance with a light projecting command issued from the control circuit 110 on the light receiving unit 70 side. ing.

  The light receiving unit 70 includes a light receiving unit 80 that receives the detection light emitted from the light projecting unit 60. The light receiving unit 80 includes a condenser lens 81 and an image sensor 85. The condenser lens 81 has a function of causing the detection light to be incident on the image sensor 85 while condensing the detection light, and is disposed in front of the image sensor 85.

  As shown in FIG. 4, the image sensor 85 is a two-dimensional sensor in which light receiving elements (hereinafter also referred to as pixels) P are arranged in a matrix to form a light receiving surface 86. A CMOS image sensor having a CMOS (Seamos) device structure in which an amplifying element is incorporated in the element P is used.

  The CMOS image sensor can read a light reception signal (a signal charge is amplified internally to be a signal voltage) by selecting a light reception element P from a plurality of light reception elements P constituting the light reception surface. It is known as a random access type device. The CMOS image sensor 85 applied to the present embodiment has a format in which a light reception signal is read out for each vertical line V, and the vertical lines V1 to V16 that are read-out images can be arbitrarily selected.

  The CMOS image sensor 85 corresponds to the imaging unit of the present invention, and the vertical lines V1 to V16 correspond to the readout line of the present invention.

  Returning to FIG. 3, the description will be continued. The light receiving unit 70 is provided with a control circuit 110 that controls and controls the entire unit, a signal readout circuit 90, and a measurement circuit 100.

  The signal readout circuit 90 reads out the received light signal from the CMOS image sensor 85 in accordance with a readout command given from the control circuit 110. The measurement circuit 100 compares the read light reception signal level with a preset level to determine whether the light receiving element P that is the read image is at the light incident level or the light shielding level. To do. Then, the result measured by the measurement circuit 100 is output to a posture detection device 180 provided separately from the light receiving unit 70 via a signal line.

  The control circuit 110 is electrically connected to a changeover switch 120, a setting unit 130, a storage unit 140, and an input / output unit 150.

  The changeover switch 120 has a function of switching modes. In the present embodiment, two types of modes, a preparation mode and a measurement mode, are set, and one of the modes can be selected by the changeover switch 120. In addition, there is no restriction | limiting in particular if the installation place of the changeover switch 120 is a place where an operator can operate easily, In this example, it is provided in the casing upper surface of the light-receiving unit 70 (refer FIG. 2).

  The input / output unit 150 is a so-called interface, in which a notebook personal computer (hereinafter simply referred to as a notebook personal computer) 200 can be externally connected. The reason why the notebook personal computer 200 is externally connected is that various setting operations performed in the preparation mode are performed by borrowing the function of the notebook personal computer 200.

  The configuration of the notebook personal computer 200 is as shown in FIG. 3 and FIG. 5, and includes a CPU 210 having a calculation function and a control function, a display device 220, a user interface (keyboard, touch pad, etc.) 240, an input / output unit 250, and the like. Yes. Note that the notebook personal computer 200 is externally connected to a connector 155 provided in the light receiving unit 70 via a connection cable U, and can be easily detached as necessary.

  The setting unit 130 has a function of setting and changing a detection line (described in detail later) V under the instruction of the notebook computer 200. The storage unit 140 is non-volatile, and is composed of, for example, an EEPROM or NVRAM.

  The setting unit corresponds to the detection range setting means of the present invention, and the range occupied by the light receiving element P on the detection line V on the light receiving surface 86 corresponds to the “detection range” of the present invention.

  In the above-described units 60 and 70, the front surfaces of the casings 61 and 71 are the light projecting and receiving windows 63 and 73, respectively. In the area, they are arranged on both the left and right sides. As a result, the detection optical axis L formed by the units 60 and 70 is substantially orthogonal to the movement path of the component W, and the component W heading from the feeder 40 to the substrate F crosses the detection optical axis L.

  Hereinafter, a series of flows from the completion of the mounting operation of both units 60 and 70 to the detection of the component W will be described.

  If the light projecting unit 60 and the light receiving unit 70 can be roughly arranged opposite to each other as shown in FIG.

  For this purpose, first, the selector switch 120 is operated to select the preparation mode, and the notebook personal computer 200 is externally connected to the light receiving unit 70 via the connection cable U. Then, the detection light is emitted from the light projecting unit 60 and the light receiving unit 70 receives the detection light.

  In the present embodiment, when the preparation mode is selected, the control circuit 110 gives the signal readout circuit 90 a readout command for reading out the received light signals of all the vertical lines V1 to V16 (that is, one frame).

  As a result, the signal readout circuit 90 sequentially reads the received light signal for each vertical line V. Then, under the instruction of the control circuit 110, the read light reception signal is sent to the notebook computer 200 through the input / output unit 150 together with the position information of the light receiving element P that is the reading source. Here, the position information of the light receiving element P is a column address and a row address of the light receiving element P.

  On the other hand, when the notebook personal computer 200 receives the position information and light reception signal of the light receiving element P, display control is performed under the instruction of the CPU 210 and the light enters the COMS image sensor 85 on the display screen 230 of the display device 220. A received light image Z of the detection light is displayed.

  More specifically, as shown in FIG. 6, the display screen 230 of the display device 220 is divided into a first display area 231 and a second display area 235, as shown in FIG. The received light image Z is displayed in the first display area 231 on the left side.

  At this time, when the detection light is incident on the light receiving surface 86 of the image sensor 85 at a position deviating from the center of the light receiving surface, the received light image Z correspondingly corresponds to the center of the first display region 231. It is displayed at a position off the screen.

  Therefore, by referring to the position of the light reception image Z displayed in the first display area 231, whether the detection light emitted from the light projecting unit 60 is correctly incident on the central portion of the CMOS image sensor 85, It can be easily discriminated by visual recognition.

  In the example of FIG. 6, the received light image Z deviates to the left from the center of the first display area 231. In such a case, the installation angle of the light projecting unit 60 can be adjusted with reference to the display screen. As shown in FIG. 7, the direction of the detection optical axis L can be easily adjusted so that the detection light emitted from the light projecting unit 60 is correctly incident on the central portion of the CMOS image sensor 85.

  Note that the display content of the first display area 231 is updated from the display content of FIG. 6 to the display content of FIG. 7 because the light receiving unit 70 periodically reads the light reception signal during the preparation mode. This is because it is transmitted to the personal computer 200. That is, in the light receiving unit 70, under the command of the control circuit 110, the process of reading the light reception signals of all the vertical lines V1 to V16 (that is, one frame) is periodically performed. The original position information and light reception signal of the light receiving element P are transmitted to the notebook computer 200. When the position information and light reception signal of the light receiving element P are received, the notebook personal computer 200 side performs a process of updating the display content under the instruction of the CPU 210. As a result, the display content of the first display area 231 is displayed during the preparation mode. Is constantly updated.

  As described above, in the preparation mode, the CMOS image sensor 85 is used two-dimensionally, and a received light image formed by detecting light entering the CMOS image sensor 85 is displayed in a two-dimensional plane. It was displayed as an image.

  On the other hand, in the measurement mode described later, the CMOS image sensor 85 is used one-dimensionally, that is, only one vertical line V is used and the other lines are not used.

  Therefore, as shown in FIG. 7, if the optical axis can be adjusted so that the emitted detection light is correctly incident on the central portion of the CMOS image sensor 85, the vertical line used in the measurement mode, that is, the detection line is used. V needs to be set.

  In this embodiment, the setting unit 130 of the light receiving unit 70 has jurisdiction over the setting of the detection line V, and stores and stores the position information of the detection line V. However, this can be changed by the notebook computer 200. It is like that.

  More specifically, when the “line display” panel displayed on the lower side of the second display area 235 is selected using the user interface 240, the first display area 231 is displayed under the display control of the CPU 210. The received light image Z and the detection line V are set to be displayed simultaneously (see FIG. 8). That is, in the first display area 231, one column corresponding to the detection line V set at that time is displayed with a colored line or the like.

  As described above, according to the present invention, “the display device displays both the received light image representing the level of the received light signal level of each readout line as an image and the detection range (here, the detection line V). “Display simultaneously on the display screen so that the relative positional relationship is visible” is embodied.

  When a predetermined operation (for example, pressing a left / right key) is performed using the user interface 240 in a state where the detection line V is displayed on the first display area 231, the CPU 210 of the notebook computer 200 performs the operation. An instruction to read and change the position of the detection line V in the operation direction is sent to the light receiving unit 70.

  As described above, the “external setting device (here, the notebook personal computer 200) of the present invention includes the setting operation unit (here, the user interface 240) for performing the setting change operation of the detection range. A configuration in which the instruction corresponding to the operation is sent to the detection range setting means (setting unit 130) of the measurement apparatus (here, the light receiving unit 70) is embodied.

  The change instruction sent from the CPU 250 is input to the setting unit 130 of the light receiving unit 70. Thereby, the setting unit 130 performs a process of changing the position of the detection line V in the operation direction. That is, the stored position information of the detection line V is rewritten.

  When the position information of the detection line V is rewritten by the setting unit 130, a process for backing up the rewritten position information of the detection line V in the storage unit 140 is performed under the instruction of the control circuit 110.

  When the above process is completed, the position information about the latest detection line V changed from the light receiving unit 70 side to the notebook personal computer 200 side is transmitted under the instruction of the control circuit 110. At this time, the light reception signals of all the vertical lines V1 to V16 read by the signal reading circuit 90 are simultaneously transmitted to the notebook computer 200 together with the position information of the light receiving element P as a reading source.

  As described above, according to the present invention, the “control means (here, the control circuit 110) of the measuring device is controlled by the detection range setting means (here, the setting unit 130) when the preparation mode is selected. Each time the setting of the detection range (here, the detection line) is changed, together with the position information of the detection range, each readout line (here, the signal readout circuit 90) read out by the signal readout means (here, the signal readout circuit 90). , All vertical lines) are output to the external display device.

  Thereafter, the notebook personal computer 200 updates the display content on the first display area 231 based on the transmitted position information of the detection line V and information on the received light signal under the instruction of the CPU 210.

  Thus, the operation performed on the user interface 240 to change the detection line V is reflected in the first display area 231. That is, if an operation for moving the detection line V to the left is performed, the position of the detection line V displayed in the first display area 231 moves to the left. At this time, the received light image Z is of course simultaneously displayed in the first display area 231 so that the relative positional relationship between them can be confirmed.

  Therefore, by repeatedly performing the above change operation, the detection line V in a state deviated from the center of the received light image Z as shown in FIG. 8 can be easily aligned with the center of the received light image Z as shown in FIG. .

  This completes all the setting operations required in the preparation mode. After that, if the connection cable U is disconnected from the connector 185 of the light receiving unit 70, the notebook computer 200 can be detached from the light receiving unit 70.

  In this embodiment, when the notebook personal computer 200 is removed, there is no way to access the setting unit 130 of the light receiving unit 70, and the setting of the detection line V cannot be changed unless the notebook personal computer 200 is externally connected again. It is like that. By doing so, it is possible to prevent the position of the detection line V from being changed unexpectedly.

  In the present embodiment, when the “pixel designation” panel displayed in the lower part of the second display area 235 is selected in the process of setting the detection line V, all the lines arranged in a line on the detection line V are selected. Among the light receiving elements P, a part of the light receiving elements P can be designated as a detection image.

  For example, as shown in FIG. 10, the line V10 is selected as the detection line, and among all the light receiving elements P1 to P14 arranged in the line V10, the light receiving elements P4 to P11 in the central portion are designated as the detection image. it can.

  With such a configuration, the detection line V can be set in accordance with the size of the light reception image (light reception spot) Z as shown in FIG. In other words, by narrowing down the pixels on the detection line V, it is possible to reduce the number of pixels in the detected image, so that the time required to read the received light signal and the other time required to process the read signal And the detection process can be performed at high speed.

  In the above example, the light receiving elements P4 to P11 are designated as the detection image, but the range occupied by the light receiving elements P4 to P11 on the light receiving surface 86 in this example is the “detection range” of the present invention.

  Information obtained by selecting and operating the “pixel designation” panel is stored and stored by the setting unit 130 of the light receiving unit 70 together with the position information of the detection line V, and is backed up in the storage unit 140. ing.

  Now, the component posture inspection processing performed by the measurement device 50 and the posture detection device 180 will be specifically described. In order to start the inspection process, it is only necessary to operate the changeover switch 120 to switch the mode from the preparation mode to the measurement mode. When this is done, the control circuit 110 reads the information about the detection line V from the setting unit 130, A readout command for reading out only the light reception signal of the detection line V is given to the signal readout circuit 90.

  Thereby, the CMOS image sensor 85 automatically switches from the two-dimensional use state in the preparation mode to the one-dimensional use state in which only one line is used.

  After that, when a timing signal Sr notifying the movement timing of the suction head 31 is input from a control circuit (not shown) on the component mounter 10 side, the measurement is automatically started in the following manner.

  To explain sequentially, upon receiving the timing signal Sr, the control circuit 110 gives a light projection command to the light projecting unit 60 in accordance with the timing at which the component W sucked and held by the suction head 31 crosses the detection optical axis L. Then, the light projecting element 62 is turned on in pulses.

  Then, the detection light emitted from the light projecting element 62 enters the light receiving surface 86 of the CMOS image sensor 85 while being collected by the condenser lens 81. At this time, a part of the detection light is blocked by the suction head 31 and the part W held by suction. Accordingly, a partially missing light-receiving image Z having a low signal level can be formed on the light-receiving surface 86 of the CMOS image sensor 85 as shown in FIG.

  Then, in accordance with the formation of the received light image Z, the signal readout circuit 90 sequentially reads the received light signal from the light receiving element P on the detection line V. Thereafter, the read light reception signal is input to the measurement circuit 100.

  In the measurement circuit 100, processing is performed to detect whether the read light receiving signal level is at the incident light level or the light shielding level, and the light receiving signal level is shielded from the incident light level on the detection line V. The level or the incident / light-shielding position at which the light-shielding level is switched to the incident light level is measured.

  In this example, the upper side from the lower surface of the component is in a light shielding state, whereas the lower side from the lower surface of the component is in a light incident state.

  Accordingly, in the case of (1) in FIG. 12 in which the component W is correctly held on the suction head 31, the incident / light-shielding position is the position (c). On the other hand, in the case of (2) in FIG. 12 in which the component W is held on the suction head 31 in a standing posture, the position (d) is the incident light shielding position.

  Then, the light incident / shielding position data is output from the measurement circuit 100 to the posture detection device 180, and the posture detection device 180 performs processing according to the data of the light shielding / shading position.

  That is, when the posture detection device 180 receives data indicating that the incident / light-shielding position is the position (c), the posture detection device 180 determines “normally held” and sends a control signal to the component mounter 10 to advance the component mounting process. . As a result, under the initiative of the component mounter 10, the mounting process of mounting the component W on the board F stopped at the work position is advanced.

  On the other hand, when the posture detection device 180 receives data indicating that the incident / light-shielding position is the position (d), it determines that it is a “holding error” and sends an error signal to the component mounter 10. As a result, error processing is performed in the component mounter 10.

  Then, the mounting process of the component W on the board F is advanced by repeatedly performing the posture detection of the component W and the mounting process of the component W in the above manner.

  Now, when the mounting process is completed, both the component mounter 10 and the measuring device 50 are turned off. However, in the measuring device 50 of this embodiment, when the power is turned on again, the backup detection is performed. The control circuit 100 is configured to perform processing for reading the information on the line V from the storage unit 140. Then, under the control circuit 100 command, the setting unit 130 is configured to perform a process of rewriting the information on the detection line with the information on the detection line V that has been backed up.

  By doing so, the setting of the detection line V set by the operator is maintained regardless of whether the power is turned on or off, which is convenient.

Next, the effect of this embodiment will be described.
In this embodiment, the CMOS image sensor 85 is properly used in accordance with the mode. That is, the CMOS image sensor 85 is used two-dimensionally in the preparation mode, and the CMOS image sensor 85 is used one-dimensionally in the measurement mode. Therefore, since only one CMOS image sensor 85 is required, the number of components is not increased, and both the two-dimensional advantage (easiness of optical axis adjustment work) and the one-dimensional advantage (high-speed processing) are exhibited. Is possible.

  Moreover, since the position of the detection line V can be changed by giving an instruction via the notebook computer 200 in the present embodiment, the following advantages can also be obtained.

  For example, in order to align the position of the received light image Z with a fixed one-dimensional detection line V that is fixedly set, it is necessary to finely adjust the directions of the light projecting side and the light receiving side. Such fine adjustment work relies heavily on the experience and familiarity of the operator. If the experience is inexperienced, it usually takes time and deteriorates workability.

  In this respect, in the present embodiment, since the position of the detection line V can be changed, rough optical axis adjustment for performing alignment so that the light reception image (light reception spot) Z does not deviate from the light reception surface 86 of the two-dimensional image sensor CMOS 85 is performed. Although necessary, if the received light image Z enters the light receiving surface 86, the detection line V can be set according to the position.

  Therefore, the fine adjustment work of the detection optical axis L (the work of aligning the received light image with the fixed one-dimensional detection line) can be eliminated, and the optical axis adjustment work can be greatly simplified. . In this case, the operation itself of setting the detection line V in accordance with the position of the received light image Z is necessary. However, since the detection line V can be set by a key operation or the like, the detection optical axis L Compared with fine-tuning, it is very easy to implement.

  In addition, in order to satisfy the configuration of the present embodiment (the image sensor 85 is used for two-dimensional use and one-dimensional use in terms of software), the image sensor 85 designates an arbitrary line and reads out a signal. It must be possible. In this regard, the CMOS image sensor 85 is optimal as the configuration of the measuring apparatus 50 because a general-purpose product can meet the above-described requirements.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above embodiment, the two-dimensional CMOS image sensor 85 is used for the light receiving unit 80. However, the light receiving element can be two-dimensionally arranged and an arbitrary line can be selected to read a light reception signal. For example, a light receiving surface may be configured by arranging a plurality of one-dimensional line sensors.

  (2) In the above embodiment, when the preparation mode is selected, the light reception signals of all the vertical lines V1 to V16 (that is, one frame) of the two-dimensional CMOS image sensor 85 are read. For example, a configuration may be adopted in which only the light reception signals of the lines closer to the center (for example, V3 to V14) of all the vertical lines V1 to V16 of the CMOS image sensor 85 are read out.

Plan view of a component mounter applied to this embodiment The perspective view which shows the state in which the components hold | maintained at the suction head cross a detection optical axis Block diagram showing the electrical configuration of the measuring device The figure which shows the light-receiving surface of the CMOS image sensor The figure which shows the state where the notebook type personal computer is connected to the light receiving unit Figure showing the display screen of a notebook computer Figure showing the display screen of a notebook computer Figure showing the display screen of a notebook computer Figure showing the display screen of a notebook computer A figure showing how some pixels are specified from the detection line Figure showing the display screen of a notebook computer Diagram showing the relationship between component posture and incident light position

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 ... Measuring apparatus 60 ... Light projection unit 61 ... Light projection element (equivalent to the "light projection means" of this invention)
70: Light receiving unit 80: Light receiving unit (corresponding to “light receiving means” of the present invention)
81 ... Condensing lens 85 ... CMOS image sensor (corresponding to "imaging part" of the present invention)
90... Signal readout circuit (corresponding to “signal readout means” of the present invention)
100: Measuring circuit (corresponding to “measuring means” of the present invention)
110... Control circuit (corresponding to “control means” and “storage control means” of the present invention)
120... Changeover switch (corresponding to “mode switching means” of the present invention)
130... Setting unit (corresponding to “detection range setting means” of the present invention)
140... Storage section (corresponding to “storage means” of the present invention)
180 ... posture detection device 200 ... notebook type personal computer (corresponding to "external device" and "external setting device" of the present invention)
210 ... CPU
220 ... display device 240 ... user interface (corresponding to "setting operation unit" of the present invention)
L: Detection optical axis W: Parts (corresponding to “moving object” and “detected object” of the present invention)
V1 to V16... Vertical line (corresponding to “read line” of the present invention)
V: Detection line (corresponding to “detection range” of the present invention)

Claims (8)

A light receiving means comprising a plurality of light receiving elements arranged two-dimensionally, and having an image pickup unit that can read out a received light signal by designating an arbitrary read line among read lines arranged in the same direction. When,
A light projecting means that constitutes a detection optical axis that emits detection light and detects the object to be detected together with the light receiving means;
A signal reading means for reading a light reception signal from the light receiving element constituting the imaging unit;
Detection range setting means for setting a light receiving element on one line out of all readout lines of the imaging unit as a detection range based on an instruction from an external device;
Mode switching means for switching the mode between a preparation mode for setting the detection range and a measurement mode for performing measurement based on a light receiving element constituting the set detection range;
Control means for giving a read command to the signal reading means;
A measuring device comprising measuring means,
When the preparation mode is selected, the control means gives a read command for reading the light reception signals of a plurality of continuous read lines to the signal read means and is read by the signal read means. While outputting the light reception signal of each readout line to an external display device,
When the measurement mode is selected, a read command for reading only the light reception signal in the detection range set by the detection range setting unit is given to the signal reading unit,
In the measurement mode, the measuring means performs processing for detecting whether the level of each received light signal read out through the signal reading means is at the incident light level or the light shielding level, and thereby on the detection range. A measuring apparatus for measuring and outputting an incident / light-shielding position at which a level of a light-receiving signal switches from an incident light level to a light-shielding level, or from a light-shielding level to an incident light level. The light receiving means is
A two-dimensional CMOS image sensor as the imaging unit;
The measuring apparatus according to claim 1, further comprising: a condensing lens that condenses the detection light on the CMOS image sensor while entering the light. The detection range setting means sets a part of the light receiving elements among all the light receiving elements located on the same line along the reading direction as a detection range based on an instruction from an external device. The measuring apparatus according to claim 1 or 2. In the external device that is removable from the measuring device,
The measurement apparatus according to claim 1, wherein the detection range setting unit changes the setting of the detection range only based on an instruction from the external device. Non-volatile storage means;
Storage control means for storing the detection range set by the detection range setting means in the storage means, and the detection range setting means stores the detection range in the storage means on condition that power is turned on again. The measurement apparatus according to claim 1, wherein a process of rewriting the stored detection range is performed. When the preparation mode is selected, the control means is read by the signal reading means together with the position information of the detection range every time the detection range is set and changed by the detection range setting means. 6. The measuring apparatus according to claim 1, wherein a light reception signal of each readout line is output to the external display device. A measurement system for detecting the attitude of a moving moving object,
7. The light projecting unit and the light receiving unit are arranged to face each other with the moving path interposed therebetween so that a detection optical axis intersects the moving path of the moving object. Measuring device,
And a posture detection device that detects the posture of the moving object based on the incident / light-shielding position output from the measurement means of the measurement device. A measuring device according to claim 6;
A display device;
An external setting device as the external device, and a measurement system comprising:
The external setting device includes a setting operation unit for performing a setting change operation on the detection range, and is configured to send the instruction corresponding to the operation of the setting operation unit to a detection range setting unit of the measurement device,
When the preparation mode is selected, the detection range setting means of the measuring device performs a process of setting and changing the detection range based on the instruction,
When the preparation mode is selected, the control means of the measuring device provides the signal reading means together with the position information of the detection range each time the detection range is changed by the detection range setting means. Output the light reception signal of each readout line read out to the external display device,
The display device displays both a light reception image representing the level of a light reception signal level of each readout line as an image and the detection range on a display screen so that a relative positional relationship between them can be visually observed. A measurement system characterized by displaying simultaneously.

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