JP2013044686A - Displacement measuring device and optical wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize miniaturization and measurement accuracy improvement of a tracking mechanism used in optical wireless communication systems.SOLUTION: A transmitter unit 11 is provided with two distance sensors 14, 15 and a receiver unit 21 is provided with a position index unit 23 and a reference height unit 24. The position index unit 23 is three-dimensionally formed and is divided into a plurality of areas, each of which has a different height, and stores the relation between the height with reference to the reference height unit 24 and the position of each area as displacement measurement table data. Distance to one of the areas of the position index unit 23 and distance to the reference height unit 24 are measured by the respective distance sensors 14, 15, and the position of the area of the position index unit 23 measured by the first distance sensor 14 is identified on the basis of the difference between the two measured distance values and the displacement measurement table data, to determine displacement magnitude and a displacement direction of the receiver unit 21. An optical axis displacement correction function is activated to correct the optical axis displacement between the transmitter unit 12 and the receiver unit 22 on the basis of the determined result.

Description

  The present invention relates to a displacement measuring apparatus and an optical wireless communication system for determining a displacement amount and a displacement direction of a measurement object.

  Generally, in an optical wireless communication system, as described in Patent Document 1 (Japanese Patent Laid-Open No. 11-346192) and Patent Document 2 (Japanese Patent Laid-Open No. 2007-282144), a light beam (optical signal) is transmitted from a transmitter. Is transmitted wirelessly to the receiving unit, and the light beam is received by the receiving unit. In this optical wireless communication system, it is necessary to reduce the divergence angle of the light beam in order to efficiently transmit the power of the light beam. However, if the divergence angle of the light beam is reduced, the oscillation due to the vibration of the transmitting unit and the receiving unit is required. , Position shift due to thermal expansion / contraction due to temperature fluctuation, optical axis shift due to change over time, angle fluctuation, etc., the light beam can be easily detached from the receiver, and the light beam reception state can become unstable There is sex.

As a countermeasure against this, some optical wireless communication systems include an optical axis deviation correction mechanism that corrects an optical axis deviation.
The optical axis misalignment correction mechanisms described in Patent Documents 1 and 2 correct the optical axis misalignment by detecting the passing position of the light beam with the optical position detection element in the middle of the path where the light beam reaches the receiving unit. I have to.

JP 11-346192 A JP 2007-282144 A

  However, in Patent Documents 1 and 2 described above, in order to detect the positional deviation of the light beam in the middle of the path along which the light beam reaches the receiving unit, the actual positional deviation between the reaching position of the light beam and the receiving unit is detected. I don't mean. For this reason, in a system in which the position of the receiving unit fluctuates (moves or vibrates) regardless of the transmitting unit, there is a disadvantage that the correction accuracy of the optical axis deviation is deteriorated.

  In addition, when detecting the displacement amount or the displacement direction of the measurement object, there is a technique in which the measurement object is imaged by a camera and the displacement amount or the displacement direction of the measurement object is detected by image processing. However, this method has disadvantages that a camera and an image processing apparatus are required and the apparatus is not only increased in size but also takes time for image processing.

  Accordingly, one of the problems to be solved by the present invention is to make it possible to reduce the size, increase the processing speed, and improve the measurement accuracy of a displacement measuring device that determines the amount and direction of displacement of a measurement object. Another object is to realize downsizing, high-speed processing, and improvement in measurement accuracy of the tracking mechanism of the optical wireless communication system.

  In order to solve the above-described problem, the invention according to claim 1 is provided in a distance measuring unit that measures the distance to the measurement position of the measurement object, and a portion of the measurement object that faces the distance measurement unit. The position index portion is formed in a three-dimensional shape, and the relationship between the height and the position with reference to the reference height portion is displacement measurement table data. Is stored in the storage means, and the distance measurement means measures the distance to the measurement position of the position index part and the distance to the reference height part, respectively, and the difference between these two distance measurement values and the displacement measurement table data The displacement amount and the displacement direction of the measurement object are determined by specifying the position measured by the distance measuring unit in the position index unit based on the above. Here, the height of the position index portion is a protruding height in the direction of the distance measuring means.

  In this case, since the relationship between the height and position of the position index portion relative to the reference height portion is stored as displacement measurement table data, the distance to the measurement position of the position index portion and the reference height are measured by the distance measuring means. Measure the distance to each part and find the difference between these two distance measurements, then you can determine the height of the measured position, and refer to the displacement measurement table data to identify the position corresponding to the measured height The displacement amount and displacement direction of the measurement object can be specified from the position. As a result, it is possible to achieve downsizing, high-speed processing, and improvement in measurement accuracy of the displacement measuring device that determines the amount and direction of displacement of the measurement object. That is, since the distance measuring means is a simple configuration, the displacement measuring device can be downsized, and the difference between the two distance measured values of the distance measuring means is calculated and only the displacement measurement table data is referred to. The amount of displacement and direction of the measurement object can be determined with a simple process, enabling high-speed processing. Furthermore, the measurement accuracy of the displacement measuring device can be simplified simply by increasing the measurement accuracy of the distance measuring means. Can be improved.

  Specifically, as in claim 2, the distance measuring unit measures the distance to the measurement position of the measurement object pinpoint, and the position index unit is divided into a plurality of areas and each area is divided. In the displacement measurement table data, the relationship between the height of each area and the area position with respect to the reference height portion is converted into data, and the position is measured by the distance measuring means. The distance to one area of the index part and the distance to the reference height part are each measured pinpoint, and based on the difference between these two distance measurement values and the displacement measurement table data, It is preferable to determine the displacement amount and the displacement direction of the measurement object by specifying the area position measured by the distance measuring means. Thereby, the displacement amount and displacement direction of the measurement object can be accurately determined.

  Further, according to a third aspect, the distance measuring means measures the distance to one area of the position index portion by pinpoint, and measures the distance to the reference height portion by pinpoint. The distance measurement direction of the first distance sensor and the distance measurement direction of the second distance sensor are preferably configured to be substantially parallel to each other. In this way, the distance to one area of the position index part and the distance to the reference height part can be easily and accurately measured by the two distance sensors.

  Further, as in claim 4, the measurement of the distance to one area of the position index portion by the first distance sensor and the measurement of the distance to the reference height portion by the second distance sensor are performed simultaneously, Based on the difference between these two distance measurement values and the displacement measurement table data, the area position measured by the distance measuring means in the position indicator section may be specified. Thus, if the measurement of the distance to one area of the position index part and the measurement of the distance to the reference height part are performed simultaneously, the position of the measurement object fluctuates (moves or vibrates). Even then, the height of the measured area (difference between two distance measurement values) can be detected with high accuracy.

  Further, the center area of the position indicator portion may be formed to be the same height as the reference height portion. In this case, the area position where the difference between the two distance measurement values is 0 becomes the central portion of the position indicator.

  Further, the position index part may be a plurality of areas divided into a grid pattern. However, as in claim 6, the position index part is formed by forming a central area in a circular shape and surrounding it. A plurality of areas may be arranged concentrically. In this way, even if the measurement point is displaced in any direction from the center of the position index portion, the displacement amount and the displacement direction can be detected with high accuracy.

  Furthermore, as in the seventh aspect, it is preferable that each area located on the circumference having the same radius from the center of the position indicator portion is formed to have the same area. In this way, measurement accuracy can be further improved.

  Further, as in claim 8, each area located on the circumference having the same radius from the center of the position indicator portion is formed so as to become higher or lower in order in the circumferential direction, and the position indicator portion Each area located on the circumference with a different radius from the center of the center may be formed so that the height is higher or lower toward the outer peripheral side. In this way, since the difference in height between adjacent areas in the circumferential direction can be reduced, the measurement error of the height of the area (difference between two distance measurement values) measured by the distance measurement means Even if the measured area position is misjudged, the misjudged area position only shifts to the area position adjacent to the area position of the correct measurement point, and the measurement error in the displacement amount and displacement direction of the measurement object is reduced. Can do.

  Further, in consideration of the fact that the measurable range of the displacement amount of the measurement object is determined by the size of the position index part, the reference height part is the same size or larger than the position index part as in claim 9. An error region having a height different from that of the reference height portion is formed on the outer periphery of the reference height portion, and the position indicator portion is formed on the outer periphery of the position indicator portion. It is preferable to form an error region having a height different from that of each area. In this way, if the amount of displacement of the measurement object is equal to or smaller than the size of the position index portion (that is, within the range in which the height of each area of the position index portion can be measured), the height of the reference height portion is set. Measurement is possible, and the displacement amount and displacement direction of the measurement object can be reliably measured. Moreover, since the error region is detected when the displacement amount of the measurement object exceeds the size of the position index portion, it can be confirmed that the displacement amount of the measurement object exceeds the measurable range.

  The displacement measuring apparatus according to claims 1 to 9 described above can be implemented in combination with various apparatuses that require a function of measuring the displacement amount and the displacement direction of the measurement object. When implemented in combination with a wireless communication system, as in claim 10, a transmitter that wirelessly transmits an optical signal, a receiver that receives the optical signal, and arrival of an optical signal transmitted from the transmitter An optical wireless communication system comprising a tracking mechanism that corrects a positional deviation between a position and the receiving unit, comprising the displacement measuring device according to any one of claims 1 to 9, wherein the distance measuring unit includes the transmitting unit. The measuring object is a receiving unit to which the receiving unit is attached, and the position indicator unit and the reference height unit are provided on the receiving unit. The displacement measuring device determines a displacement amount and a displacement direction of the receiving unit based on a difference between two distance measurement values by the distance measuring means and the displacement measurement table data, and the tracking mechanism You may make it correct | amend the position shift of the arrival position of the optical signal transmitted from the said transmission part, and the said receiving part based on the measurement result of a displacement measuring device. In this manner, in the optical wireless communication system, the relative displacement amount and the displacement direction of the receiving unit with respect to the transmitting unit can be accurately detected using the displacement measuring device of the present invention. The tracking mechanism can be reduced in size, increased in processing speed, and improved in measurement accuracy.

  In this case, as in claim 11, both or one of the transmission unit and the reception unit is attached to an object that moves or vibrates, and the displacement measuring device measures and measures the distance to the measurement position of the position index unit. The distance to the height portion may be measured simultaneously, and the displacement amount and the displacement direction of the receiving unit may be determined based on the difference between these two distance measurement values and the displacement measurement table data. In this way, even when both or one of the transmission unit and the reception unit moves or vibrates, the relative displacement amount and displacement direction of the reception unit with respect to the transmission unit can be accurately detected.

FIG. 1 is a diagram schematically showing a configuration of an optical wireless communication system in an embodiment of the present invention. FIG. 2 is an enlarged plan view showing the position index portion and the reference height portion. FIG. 3 is a diagram illustrating an example of the displacement measurement table data. FIG. 4 is a diagram for explaining the influence of the shift in the distance measuring direction (angle) of each distance sensor on the distance measurement value. FIG. 5 is a perspective view showing an application example of the optical wireless communication system to the component mounter.

Hereinafter, an embodiment in which a mode for carrying out the present invention is applied to a component mounter will be described.
First, the configuration of the optical wireless communication system will be described with reference to FIG.

  The transmission unit 11 is provided with a transmission unit 12 that wirelessly transmits an optical signal (light beam) and a distance measuring device 13 (distance measuring means). The transmitter 12 is composed of a semiconductor laser or the like, and is equipped with an optical axis deviation correction function that automatically adjusts the emission direction (optical axis) of the optical signal (light beam). The optical axis deviation correction function may be one that mechanically adjusts the angle and position of the transmitter 12 with an actuator according to the optical axis deviation, or a semiconductor laser that can freely control the beam emission direction. May be used. This semiconductor laser uses a crystal in which two types of photonic crystals having different periods are combined, and the beam emission direction can be changed by changing the difference between the periods. If the optical axis deviation correction function is configured using a semiconductor laser capable of freely controlling the beam emission direction, there is an advantage that a drive mechanism such as a servo becomes unnecessary and the optical axis deviation correction function can be reduced in weight.

  The optical axis deviation correction function may be provided on the receiving unit 22 side described later. For example, a fine positioning mirror (FPM) is provided on the receiving unit 22 side, and the light beam emitted from the transmitting unit 12 is received by the receiving unit. The optical axis deviation may be corrected by adjusting the angle of the fine positioning mirror reflected to 22 according to an optical axis deviation detection value described later. Alternatively, the position of the receiving unit 22 may be mechanically adjusted by an actuator according to the optical axis deviation.

  In the present embodiment, the distance measuring device 13 includes a first distance sensor 14 and a second distance sensor 15. The distance measuring direction of the first distance sensor 14 and the distance measuring direction of the second distance sensor 15 are Are configured to be substantially parallel. The distance measuring directions of these two distance sensors 14 and 15 are substantially parallel to the light beam emitting direction (angle 0 °) of the transmitter 12. Each of the distance sensors 14 and 15 is configured using a distance sensor that can measure the distance to the measurement object pinpoint, for example, a reflection type laser displacement sensor.

  On the other hand, the receiving unit 21 is attached with a receiving unit 22 that receives an optical signal (light beam) transmitted from the transmitting unit 12. Further, the reception unit 21 is provided with a position indicator 23 and a reference height 24 where the distance is measured pinpointed by the two distance sensors 14 and 15 of the transmission unit 11.

  The position indicator 23 is located in the distance measuring direction (laser emission direction) of the first distance sensor 14 and is divided into a plurality of areas and has a different height for each area as shown in FIG. Is formed. Here, the height of the area is a protruding height in the direction of the first distance sensor 14. The size (area, dimension) of each area is formed to a size that can be measured by the first distance sensor 14 while distinguishing it from the adjacent area. The difference in height of each area is different from the height of other areas. A difference in height that can be measured separately (a difference larger than the measurement error of the first distance sensor 14) is set.

  The position index portion 23 may be a plurality of areas partitioned in a grid pattern. In this embodiment, the position index portion 23 forms a central area A0 in a circular shape and surrounds it. A plurality of areas A1 to A56 are arranged concentrically, and each area located on the circumference having the same radius from the center of the position indicator 23 is formed to have the same area (same pitch). . In this way, even if the measurement point is displaced from the center of the position indicator 23 in any direction, the displacement amount and the displacement direction can be accurately detected.

  Furthermore, each area located on the circumference having the same radius from the center of the position indicator portion 23 is formed so as to increase (or decrease) in order in the circumferential direction. Each area located on a different circumference is formed so that the height is higher (or lower) on the outer peripheral side. On the outer periphery of the position indicator 23, an error area Aerror having a height different from that of the areas A1 to A56 of the position indicator 23 is formed.

  In the example of FIG. 2, the center area A0 is the lowest area among all the areas A0 to A56 of the position indicator 23, and a total of eight areas A1 to A8 are arranged at a 45 ° pitch on the outer periphery thereof. The heights of the areas A1 to A8 are gradually increased in the clockwise direction. A total of 16 areas A9 to A24 are arranged at a 22.5 ° pitch on the outer circumference of the first area A1 to A8, and the height of each area A9 to A24 is gradually increased in the clockwise direction. The first area A9 in the second turn is arranged at a position adjacent to the last area A8 in the first turn. As a result, the two areas A8 and A9 in which the difference in height between the first and second rounds is minimized are arranged adjacent to each other. A total of 32 areas A25 to A56 are arranged at a 11.25 ° pitch on the outer circumference of the second area A9 to A24, and the height of each area A25 to A56 is gradually increased in the clockwise direction. The first area A25 in the third turn is arranged at a position adjacent to the last area A24 in the second turn. As a result, the two areas A24 and A25 in which the difference in height between the second and third rounds is minimized are arranged adjacent to each other.

  In this way, the height difference between the areas adjacent to each other in the circumferential direction can be reduced and the height difference between the first, second and third laps is minimized. Therefore, even if the measured area position is erroneously determined by the measurement error of the height of the area measured by the distance measuring device 13 (difference between two distance measurement values), the erroneously determined area position is It is merely shifted to the area position adjacent to the area position of the correct measurement point, and the measurement error in the displacement amount and the displacement direction of the measurement object can be reduced.

  On the other hand, the reference height portion 24 is located in the distance measuring direction (laser emission direction) of the second distance sensor 15 and is formed at the same height as the area A0 at the center of the position indicator portion 23, and the position indicator. An error region Berror having a height different from that of the reference height portion 24 is formed on the outer periphery of the reference height portion 24 while being formed in a circular shape having the same size as or larger than the portion 23. Has been. The distance between the center of the position indicator 23 and the center of the reference height 24 matches the distance between the center of the first distance sensor 14 and the center of the second distance sensor 15. When the measurement point is the center of the position indicator 23, the measurement point of the second distance sensor 15 is configured to be the center of the reference height 24.

  The height of the reference height portion 24 may be formed at a height different from the central area A0 of the position indicator portion 23, and the shape of the reference height portion 24 is not limited to a circle. , It may be square.

  The relationship between the heights of the areas A0 to A56 of the position index unit 23 and the area positions with reference to the height of the reference height part 24 is created as displacement measurement table data (see FIG. 3). Here, the area position is represented, for example, by polar coordinates with the center of the position index portion 23 as the origin, the angle of the center of each area A0 to A56, and from the center of the position index portion 23 to the center of each area A0 to A56. Expressed in distance (concentric radius). The angle of the center of each area A0 to A56 is represented by an angle in the clockwise direction with 0 ° in the vertical direction. The area position may be represented by, for example, orthogonal coordinates (XY coordinates) with the center of the position indicator 23 as the origin.

  As shown in FIG. 4, when the distance measurement direction (laser emission direction) of the first distance sensor 14 varies as L0, L1, and L2, the distance measured by the first distance sensor 14 is the radius of the position indicator 23. If the distance is sufficiently long with respect to the area height, the variation of the distance measurement value due to the angle from the center can be ignored, and there is no need to correct the measurement error. However, in order to reduce the influence, each area A0 to A56 What is necessary is just to make it height so that an outer peripheral side is high. It should be noted that the influence of the warp of the position indicator 23 can be ignored.

  The displacement measurement table data in FIG. 3 is stored in the storage device 32 (storage means) of the control arithmetic device 31. The control arithmetic device 31 may be provided in the transmission unit 11 or may be provided separately from the transmission unit 11. The control arithmetic unit 31 measures the distance to one area of the position index part 23 and the distance to the reference height part 24 by two distance sensors 14 and 15, respectively, and the difference between these two distance measurement values. And the displacement measurement table data, the area position measured by the first distance sensor 14 of the position indicator 23 is specified, thereby determining the displacement amount and the displacement direction of the receiving unit 21 that is the measurement object. . Further, the control arithmetic unit 31 operates the optical axis deviation correction function so as to correct the optical axis deviation between the transmission unit 12 and the reception unit 22 based on the determination result of the displacement amount and the displacement direction of the reception unit 21. The light beam emission direction (optical axis) of the transmission unit 12 is automatically adjusted to coincide with the reception unit 22.

  An example in which the optical wireless communication system configured as described above is applied to a component mounter will be described with reference to FIG. The mounting head 41 holds downward a suction nozzle (not shown) for sucking a component supplied by a feeder (not shown) and mounting it on the circuit board. The mounting head 41 is supported by a Y-axis slide mechanism 42 so as to be slidable in the Y-axis direction (a direction perpendicular to the circuit board transport direction). The Y-axis slide mechanism 42 is supported by the X-axis slide mechanism 43 so as to be slidable in the X-axis direction (circuit board conveyance direction).

  The connecting portion 44 between the Y-axis slide mechanism 42 and the X-axis slide mechanism 43 is provided with a relay receiving unit 21a and a relay transmitting unit 11 in the X-axis direction and the Y-axis direction, respectively, and the mounting head In 41, a receiving unit 21b is provided at a position facing the transmitting unit 11 for relay. On one end side of the X-axis slide mechanism 43, a transmission unit (not shown) is provided at a position facing the relay reception unit 21a. This transmission unit is connected to a control device (not shown) of the component mounting machine. It is connected. The relay receiving unit 21a and the relay transmitting unit 11 provided in the connecting portion 44 are connected by a signal cable 45, and a signal received by the relay receiving unit 21a is used as a relay transmitting unit. 11 to transmit to.

  The configuration of each transmission unit 11 and each reception unit 21a, 21b is the same as that described with reference to FIGS. 1 to 4, and the distance to one area of the position indicator 23 by the two distance sensors 14, 15. And the distance to the reference height part 24 are measured at pinpoints, and measured by the first distance sensor 14 in the position index part 23 based on the difference between these two distance measurement values and the displacement measurement table data. By specifying the area position, the displacement amount and the displacement direction of the receiving unit 21 are determined, and an optical axis deviation correction function is provided so as to correct the optical axis deviation between the transmitting unit 12 and the receiving unit 22 based on the determination result. By operating, the light beam emission direction (optical axis) of the transmission unit 12 is automatically adjusted so as to coincide with the reception unit 22. Thereby, the light beam emitted from the transmitter 12 is reliably received by the receiver 22.

  When at least one measurement point of the two distance sensors 14 and 15 is in the error areas Aerror and Berror, the displacement amount and the displacement direction of the receiving unit 21 cannot be determined, so that the optical axis deviation cannot be corrected. Therefore, in this case, even if the light beam is emitted from the transmission unit 12, it is determined that the reception unit 22 cannot receive the light beam, and the emission of the light beam from the transmission unit 12 is stopped.

  Conventionally, since the control device of the component mounting machine and the mounting head 41 are connected by a cable, a cable wiring space is required, or the movement / bending operation of the cable is repeated by repeated movement of the mounting head 41. As a result, cable disconnection or poor connection may occur.

  On the other hand, as shown in FIG. 6, if the optical wireless communication system of the present embodiment is applied to a component mounter, the cable connecting the control device of the component mounter and the mounting head 41 can be eliminated. This eliminates the need for a cable wiring space, contributes to space saving, and can solve the problem of cable disconnection and poor connection.

  The displacement measuring apparatus of the present embodiment described above measures the distance to one area of the position index portion 23 and the distance to the reference height portion 24 by two distance sensors 14 and 15, respectively. By specifying the area position measured by the first distance sensor 14 of the position index unit 23 based on the difference between the two distance measurement values and the displacement measurement table data, the reception unit 21 is relative to the transmission unit 11. The displacement amount and the displacement direction are determined. In this case, since the relationship between the height of each area and the area position of the position index unit 23 with respect to the height of the reference height portion 24 is stored as displacement measurement table data, the two distance sensors 14 and 15 If the distance to one area of the position index part 23 and the distance to the reference height part 24 are respectively measured at pinpoints, and the difference between these two distance measurements is obtained, the height of the measured area is determined, By referring to the displacement measurement table data, the area position corresponding to the height of the measured area can be specified, and the displacement amount and the displacement direction of the receiving unit 21 that is the measurement object can be specified from the area position. it can. As a result, it is possible to reduce the size of the displacement measuring device that determines the displacement amount and direction of the receiving unit 21, increase the processing speed, and improve the measurement accuracy. That is, since the distance sensor 14 or 15 is a simple configuration, the displacement measuring device can be downsized, and the difference measurement table data is calculated by calculating the difference between the distance measurement values of the two distance sensors 14 and 15. The displacement amount and the displacement direction of the receiving unit 21 can be obtained by a simple process that simply refers to the above, and the displacement amount and the displacement direction of the receiving unit 21 are calculated at a higher speed than in the case of image processing of the captured image of the camera. In addition, the measurement accuracy of the displacement measuring device can be easily improved only by increasing the measurement accuracy of the distance sensors 14 and 15.

  By the way, when both the transmission unit 11 and the reception unit 21 (21a, 21b) are stopped, when determining the displacement amount and the displacement direction of the reception units 21a, 21b, up to one area of the position indicator 23 The distance to the reference height portion 24 may be measured at the same time, or one of the distances may be measured and then the other distance may be measured. When both the transmission unit 11 and the reception unit 21 are stopped, the measurement condition does not change even if the two distances are measured separately. Therefore, the position index based on the height of the reference height portion 24 is used. The height of each area of the unit 23 (difference between two distance measurement values) can be accurately measured.

  However, in the case where both or one of the transmission unit 11 and the reception unit 21 is moving or vibrating, if the two distances are measured separately, the measurement conditions change and the height of the reference height portion 24 It is impossible to accurately measure the height of each area (difference between two distance measurement values) of the position indicator 23 with reference to.

  Therefore, when the relative displacement amount and the displacement direction of the reception unit 21 with respect to the transmission unit 11 are determined when both or one of the transmission unit 11 and the reception unit 21 is moving or vibrating, the position indicator unit The distance to one area 23 and the distance to the reference height portion 24 may be measured simultaneously. In this way, even when both or one of the transmission unit 11 and the reception unit 21 moves or vibrates, the height of each area of the position indicator 23 based on the height of the reference height 24 ( The difference between the two distance measurement values) can be accurately measured, and the relative displacement amount and displacement direction of the reception unit 21 with respect to the transmission unit 11 can be detected with high accuracy.

  Further, in the present embodiment, the reference height portion 24 is the same size as the position index portion 23 or the same, considering that the measurable range of the displacement amount of the receiving unit 21 is determined by the size of the position index portion 23. An error region Berror having a height different from that of the reference height portion 24 is formed on the outer periphery of the reference height portion 24, and the outer periphery of the position indicator portion 23 is formed on the outer periphery of the reference height portion 24. An error area A error having a different height from each area of the position indicator 23 is formed. In this way, if the amount of displacement of the receiving unit 21 is equal to or less than the size of the position indicator 23 (that is, within the range in which the height of each area of the position indicator 23 can be measured), the reference height portion 24 The height can be measured, and the displacement amount and the displacement direction of the receiving unit 21 can be reliably measured. Moreover, since the error area A error is detected when the displacement amount of the receiving unit 21 exceeds the size of the position indicator 23, it can be confirmed that the displacement amount of the receiving unit 21 exceeds the measurable range.

  In the present embodiment, the distance measuring means for measuring the distance to the measurement object pinpoint, the first distance sensor 14 for measuring the distance to one area of the position indicator 23, and the reference height portion The second distance sensor 15 that measures the distance up to 24 is used. However, when measuring the distance to the measurement object that is stopped, the distance measuring means is configured by one distance sensor, and the distance is measured. The distance measurement direction (angle) or position of the sensor is switched between the position index portion 23 measurement and the reference height portion 24 measurement to measure the distance to one area of the position index portion 23 and the reference height portion. You may make it measure the distance to 24 separately.

  Further, the application range of the optical wireless communication system using the displacement measuring device of the present invention is not limited to the component mounting machine, and can be widely applied to various devices equipped with the communication system. The present invention can also be applied to a radio communication system using waves.

  The application range of the displacement measuring apparatus of the present invention is not limited to the optical wireless communication system, and can be widely applied to various devices that require a function for determining the displacement amount and the displacement direction of the measurement object.

  DESCRIPTION OF SYMBOLS 11 ... Transmission unit, 12 ... Transmission part, 13 ... Distance measuring device (distance measuring means), 14 ... 1st distance sensor, 15 ... 2nd distance sensor, 21, 21a, 21b ... Reception unit (measurement object) , 22 ... receiving part, 23 ... position indicator part, 24 ... reference height part, 31 ... control arithmetic unit, 32 ... storage device (storage means), 41 ... mounting head, 42 ... Y axis slide mechanism, 43 ... X axis Slide mechanism, 44 ... connecting part

Claims (11)

Distance measuring means for measuring the distance to the measurement position of the measurement object;
A position index portion and a reference height portion provided in a portion of the measurement object facing the distance measuring means;
The position indicator portion is formed in a three-dimensional shape, and the relationship between the height and the position with reference to the reference height portion is stored in the storage means as displacement measurement table data,
The distance measuring means measures the distance to the measurement position of the position index portion and the distance to the reference height portion, respectively, and based on the difference between these two distance measurement values and the displacement measurement table data, the position index A displacement measuring apparatus for determining a displacement amount and a displacement direction of the object to be measured by specifying a position measured by the distance measuring means in the unit. The distance measuring means measures the distance to the measurement position of the measurement object pinpoint,
The position indicator is divided into a plurality of areas and is formed in a three-dimensional shape having a different height for each area,
In the displacement measurement table data, the relationship between the height of each area and the area position based on the reference height portion is converted into data,
The distance measuring means measures the distance to one area of the position index part and the distance to the reference height part by pinpoint, and based on the difference between these two distance measurement values and the displacement measurement table data. The displacement measuring device according to claim 1, wherein the displacement amount and the displacement direction of the measurement object are determined by specifying an area position measured by the distance measuring unit in the position index unit.   The distance measuring means includes a first distance sensor that pinpoints a distance to one area of the position index part, and a second distance sensor that pinpoints a distance to the reference height part, The displacement measuring device according to claim 2, wherein the distance measuring direction of the first distance sensor and the distance measuring direction of the second distance sensor are substantially parallel to each other. .   The measurement of the distance to one area of the position indicator part by the first distance sensor and the measurement of the distance to the reference height part by the second distance sensor are performed simultaneously, and the two distance measurement values 4. The displacement measuring apparatus according to claim 3, wherein an area position measured by the distance measuring unit in the position index unit is specified based on the difference and the displacement measurement table data.   The displacement measuring device according to claim 2, wherein an area of a central portion of the position index portion is formed to be the same height as the reference height portion.   6. The displacement measuring device according to claim 2, wherein the position index portion has a central area formed in a circular shape and a plurality of areas arranged concentrically around the central area.   The displacement measuring apparatus according to claim 6, wherein each area located on a circumference having the same radius from the center of the position index portion is formed to have the same area. Each area located on the circumference having the same radius from the center of the position indicator portion is formed so that the height is increased or decreased in order in the circumferential direction,
The displacement according to claim 6 or 7, wherein each area located on a circumference having a different radius from the center of the position index portion is formed such that the height is higher or lower toward the outer peripheral side. measuring device. The reference height portion is formed to have the same size as or larger than the position index portion, and the outer height of the reference height portion is different from the reference height portion. An error area is formed,
9. The displacement measuring apparatus according to claim 2, wherein an error region having a height different from each area of the position index portion is formed on an outer periphery of the position index portion. A transmitter that wirelessly transmits an optical signal;
A receiver for receiving the optical signal;
In an optical wireless communication system including a tracking mechanism that corrects a positional deviation between the arrival position of the optical signal transmitted from the transmission unit and the reception unit,
A displacement measuring device according to any one of claims 1 to 9,
The distance measuring means is provided in a transmission unit to which the transmission unit is attached,
The measurement object is a receiving unit to which the receiving unit is attached,
The position index part and the reference height part are provided in the receiving unit,
The displacement measuring device determines a displacement amount and a displacement direction of the receiving unit based on a difference between two distance measurement values obtained by the distance measuring means and the displacement measurement table data;
The optical wireless communication system, wherein the tracking mechanism corrects a positional deviation between an arrival position of an optical signal transmitted from the transmission unit and the reception unit based on a measurement result of the displacement measuring device. The transmitting unit and / or the receiving unit are attached to a moving or vibrating object,
The displacement measuring device simultaneously measures the distance to the measurement position of the position index part and the distance to the reference height part, and calculates the difference between the two distance measurement values and the displacement measurement table data. The optical wireless communication system according to claim 9, wherein a displacement amount and a displacement direction of the receiving unit are determined based on the determination result.

Images