JP2007057335A - Apparatus and method for measuring dimension of object to be measured - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily measure dimensions of an object to be measured existing on some coordinate positions without increasing the number of sensors. <P>SOLUTION: An apparatus for measuring the dimensions is provided with: a base member 2 on which the object to be measured X with a lead Y is mounted in its implementation state; and a measurement sensor 6 having a light emitting device 3 and a light receiving device 4 being respectively disposed on both sides of the base member 2, wherein reference light from the light emitting device 3 is captured by the light receiving device 4, and the dimensions of the object to be measured X is measured from a detection output of the receiving device 4. The base member 2 is set rotatable in a manual or electric operation. Therefore, only an appropriate operation of rotating the base member, on which the object to be measured X is previously mounted, enables various portions of the object to be measured X to be located in an optical path of the reference light from the light emitting device 3 to the light receiving device 4, whereby the dimensions of the object to be measured X existing on the some coordinate positions can be measured easily. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic component size measuring apparatus that uses a optical measuring sensor having a projector and a light receiver to measure the size of an object with a lead mounted in a mounted state on a base in a non-contact manner, and The present invention relates to a dimension measuring method.

  In general, an electronic device with a packaged lead such as an on-board power source is indispensable to inspect a height dimension at the end of the manufacturing process and the assembly process. In that case, not only the height (thickness) dimension of the electronic device alone is measured, but also in order to detect the inclination and floating of the mounting posture with the electronic device mounted on the substrate, The height of the edge is measured.

As an apparatus for measuring the height dimension of a measurement object with the measurement object mounted on such a substrate, for example, an electronic component mounting apparatus in Patent Document 1 is known. Here, an optical measurement sensor (distance sensor) having a projector and a light receiver is used to measure the difference in height before and after mounting the electronic component on the substrate at the same coordinate position. By comparing this with the electronic component thickness information stored in advance, the floating or inclination of the electronic component in the mounted state is detected.
JP 2002-176292 A

  In the case of the above prior art, in order to measure the height dimension of a plurality of parts of the object to be measured, several measurement sensors corresponding to at least the number are required. However, the measurement sensor is expensive, and if a number of measurement sensors are purchased, the product cost of the object to be measured increases accordingly. Further, when the object to be measured is relatively small, there arises a problem that the number of measurement sensors that can be installed around the object to be measured is limited.

  The present invention has been made paying attention to the above-mentioned problem, and it is possible to easily measure the dimension of the measurement object at several coordinate positions without increasing the number of measurement sensors, and the dimension measurement of the measurement object. Its purpose is to provide a method.

  An apparatus for measuring a dimension of an object to be measured according to the present invention includes a base on which an object to be measured with a lead is mounted in a mounted state, a projector and a light receiver on both sides of the base, and a reference light from the projector In the device for measuring the height of the object to be measured, which is provided with a measurement sensor for measuring the size of the object to be measured by capturing the light with the light receiver, the base is made to be rotatable.

  Further, in the method for measuring a dimension of an object to be measured in the present invention, a rotatable base is disposed between a projector and a light receiver that constitute a measurement sensor, and the object to be measured with a lead is mounted on the base. The reference light from the projector is captured by the light receiver while the base on which the object to be measured is mounted is rotated, and the dimension of the object to be measured is measured.

  According to the above-described apparatus and method, various parts of the object to be measured are positioned in the optical path of the reference light from the light projector to the light receiver of the measurement sensor simply by appropriately rotating the base on which the object to be measured is previously mounted. Can be made. Therefore, there is no need to place multiple expensive measurement sensors around the object to be measured, and the dimensions of the object to be measured at several coordinate positions can be easily obtained from the detection output that matches the dimensions of the object to be measured obtained from the light receiver. Can be measured.

  According to the dimension measuring apparatus and the dimension measuring method of the object to be measured in the present invention, the dimensions of the object to be measured at several coordinate positions can be easily measured without increasing the number of measurement sensors.

  Hereinafter, preferred embodiments of a dimension measuring apparatus and a dimension measuring method of an object to be measured according to the present invention will be described in detail with reference to the accompanying drawings.

  First, the mechanical configuration of the apparatus will be described with reference to FIGS. In the figure, reference numeral 1 denotes a fixed tool table installed in a production process or assembly process line, and 2 denotes a flat disk-shaped base that is rotatably provided with respect to the tool table 1. Is capable of rotating in both forward and reverse directions about a rotation axis C perpendicular to the horizontal upper surface of the tool table 1. Reference numerals 3 and 4 denote a projector and a light receiver respectively disposed on one side and the other side of the base 2, and these together with an amplifier unit 5 provided at an appropriate position of the tool table 1, a later-described object X to be measured. Configure to measure height dimension.

  Here, the configuration of each part will be described in detail. The base 2 is composed of a mounting part 11 that forms a flat mounting surface and an annular convex part 12 formed on the outer periphery of the mounting part 11. The placement portion 11 is provided with a plurality of lead insertion holes 13. The lead insertion hole 13 is disposed to face the lead Y protruding from the bottom surface of the measurement object X so that the bottom surface of the measurement object X is placed on the upper surface (mounting surface) of the placement portion 11. . Preferably, the lead insertion hole 13 is provided in the mounting portion 11 so as to correspond to the leads Y of the plurality of types of objects to be measured X. If it carries out like this, it will become possible to measure the height dimension of multiple types of to-be-measured object X with the common base 2. FIG. Note that the base 2 does not have to be disk-shaped, and the upper surface shape of the mounting portion 11 facing the substrate 2 may be arbitrarily formed in accordance with the shape of the bottom surface of the body of the DUT X. The annular convex portion 12 is for preventing the object to be measured X from sliding off the base 2 when the object to be measured X is mounted on the base 2.

  The light projector 3 and the light receiver 4 are respectively disposed on a pair of bases 16 and 17 placed on the tool table 1. These pedestals 16 and 17 are respectively provided with adjusting screws 18 and 19 that are screwed into screw holes (not shown) of the tool table 1, and the pedestal 16 is moved in the horizontal direction by loosening the screws 18. Thus, the position of the light projector 4 can be adjusted, and the position of the light receiver 4 can be adjusted by loosening another screw 19 and moving the base 17 in the horizontal direction.

  The measurement sensor 6 in this embodiment is arranged so that the projector 3 and the light receiver 4 face each other. Here, the measurement principle by the measurement sensor 6 will be described with reference to FIG. 3. The projector 3 is composed of a light source 21 such as a semiconductor laser, and a collimator lens 22 that converts the emitted light diffused from the light source 21 into parallel light. The light receiver 4 includes a condensing lens 23 that condenses the parallel laser light from the projector 3 and a photodiode 24 as a light receiving element that receives the condensed laser light. In the measurement, parallel laser light is emitted from the light projector 3 toward the light receiver 4, and is condensed on the photodiode 24 by the condenser lens 23 on the light receiver 4 side. At this time, if the object to be measured X is placed between the projector 3 and the light receiver 4, the amount of received laser light taken into the photodiode 24 decreases, so that the linearity corresponding to the height dimension of the object to be measured X is reduced. An output will be obtained from the photodiode 24.

  The measurement sensor 6 in this embodiment measures the height dimension of the measurement object X based on the amount of light received by the so-called photodiode 24. For example, a CCD image sensor is used for the light receiver 4. Alternatively, another optical measurement sensor 6 may be used, such as a laser beam emitted from the projector 3 while being scanned. In any case, since the base 2 is rotatable in this embodiment regardless of the type of measurement sensor 6, it is not necessary to provide a plurality of measurement sensors 6 around the object to be measured X. The height of various parts of the measurement object X can be measured by the single measurement sensor 6.

  Next, the configuration of the control system of the apparatus will be described with reference to FIG. In the same figure, 31 is a control unit that controls each part of the dimension measuring apparatus in the present embodiment, and an input port of this control unit 31 is connected with a start switch 32 as an operation means for instructing measurement start, Connected to the output port of the control unit 32 are a rotary actuator (air cylinder) 33 as a drive source for applying a rotational force to the base 2 and an output means 34 such as an LED or a buzzer for performing pass / fail judgment of the measurement result. . The rotary actuator 33 includes an encoder (not shown) that detects the rotational position of the base 2, and the detection output of this encoder is given to the input port of the control unit 31. The light projector 3 and the light receiver 4 of the measurement sensor 6 are connected to the control unit 31 via the amplifier unit 5. The control unit 31 is provided with actuator control means 35 for controlling the operation (rotation or stop) of the rotary actuator 33, and the height of the object X to be measured based on the detection output of the light receiver 4 amplified by the amplifier unit 5. Determination means 36 is provided for determining whether or not the height of the object X to be measured is within a pre-stored allowable range and transferring the result to the output means.

  In the above control system configuration, for example, the base 2 can be manually moved instead of the rotary actuator 33, and if the base 2 is rotated once by a rotation detection sensor such as an encoder (not shown), the determination is made. You may make it perform the pass / fail determination regarding the height of the to-be-measured object X by the means 35. FIG. The measurement sensor 6 may also function as the control unit 31.

  Next, a method for measuring the height of the measurement object X using the dimension measuring apparatus will be described with reference to the flowchart of FIG. First, prior to the measurement of the measurement object X, the projector 3 and the light receiver 4 constituting the measurement sensor 6 are opposed to each other at a predetermined position of the tool table 1, and a part of the reference light from the projector 3 is measured. The base 2 is rotatably arranged between the light projector 3 and the light receiver 4 (step S1). Note that the arrangement of the measurement sensor 6 and the base 2 need only be performed once before the measurement of the measurement object X, and need not be performed every time the dimension of the measurement object X is measured.

  In the next step S <b> 2, for example, an on-board power source as an electronic device that has been completed through a manufacturing process and an assembling process is placed on the base 2 as an object to be measured X. In this case, a plurality of leads Y protruding from the bottom surface of the body of the object to be measured X are inserted into the corresponding lead insertion holes 13 and the bottom surface of the body of the object to be measured X is placed on the mounting portion 11 of the base 2. To be placed.

  In this way, when the measurement object X is mounted on the mounting portion 11 of the base 2 in a mounted state, the process proceeds to step S3 where the start switch 32 is pushed, and measurement of the height dimension of the measurement object X is started. To do. Here, an operating voltage is applied to the rotary actuator 33 by the actuator control means 35 of the control unit 31, and the base 2 starts to rotate at a predetermined speed. At the same time, the determination means 36 takes in a detection output corresponding to the amount of reference light taken into the light receiver 4 from the light receiver 4 for the part of the object X to which the reference light from the projector 3 hits. Find the height dimension. The calculation of the height dimension of the measurement object X is performed every time a specific sampling time or the base 2 reaches a specific position, and the height dimensions of various parts of the measurement object X are stored in the determination means 36. Going to be.

  When the determination means 36 determines that the base 2 has rotated at least one revolution or more based on the detection output from the rotary actuator 33, the determination means 36 measures each part of the measured object X measured and recorded up to the previously stored allowable range. It is determined whether or not the height dimension is included, and the result is output to the output means 34 (step S4). In the pass / fail determination in step S4, if the measurement object X cannot be correctly mounted on the mounting portion 11 of the base 2 because the lead Y is bent or the like, the measurement object 6 measured by the measurement sensor 6 is measured. A part or all of the height dimension of each part is out of the allowable range, and the fact is notified or displayed from the output means 34. On the contrary, if the object to be measured X is correctly mounted on the mounting portion 11 of the base 2, all the height dimensions of each part of the object to be measured X are within the allowable range. Notification or display from 34. In addition, you may perform the pass / fail determination of this step S4 whenever the determination means 36 calculates the height dimension of the to-be-measured object X.

  As described above, in this embodiment, the base 2 on which the measurement object X with the lead Y is mounted in the mounted state, and the projector 3 and the light receiver 4 are arranged on both sides of the base 2, respectively. A base 2 is manually operated in a dimension measuring apparatus 6 having a measuring sensor 6 that captures reference light by a light receiver 4 and measures a dimension of the object X by a detection output from the light receiver 4. Alternatively, it is characterized in that it can be rotated electrically.

  In this embodiment, a rotatable base 2 is disposed between the projector 3 and the light receiver 4 constituting the measurement sensor 6, and a measurement object X with a lead Y is mounted on the base 2 in a mounted state. The reference light from the projector 3 is captured by the light receiver 4 while rotating the base 2 on which the object X is mounted manually or electrically, and the dimension of the object X is determined by the detection output from the light receiver 4. The dimension measurement method to measure is adopted.

  In any of these dimension measuring apparatuses and dimension measuring methods, the base 2 on which the object to be measured X is mounted in advance is rotated as appropriate in the optical path of the reference light from the light projector 3 to the light receiver 4 of the measurement sensor 6. Various parts of the measurement object X can be positioned. Therefore, it is not necessary to arrange a plurality of expensive measurement sensors 6 around the object to be measured X, and the object to be measured at several coordinate positions can be obtained from the detection output corresponding to the dimension of the object to be measured X obtained from the light receiver 4. The dimension of X can be easily measured.

  Further, as an effect of the embodiment, since the base 2 surrounds the mounting portion 11 on which the measurement object X is placed and is provided with an annular convex portion 12 as a protruding portion, the annular convex portion 12 causes the base 2 to When the measurement object X is mounted on the table 2, the measurement object X can be prevented from sliding off from the base 2. Furthermore, if the base 2 floats up for some reason, a part of the reference light from the projector 3 hits the annular convex portion 12 and changes in the detection output from the light receiver 4, so that the base 2 rotates correctly. It can be judged by the annular convex part 12 whether it is.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible in the range of the summary of this invention. In the present embodiment, the configuration is such that the dimension in the height direction of the measurement object X is measured in particular, but the present invention can be similarly applied to the measurement of dimensions such as the width and depth of the measurement object X.

It is a perspective view which shows the principal part of the dimension measuring apparatus in one Example of this invention. It is a top view which shows a state when mounting a to-be-measured object to a base and rotating a base in order of (a)-> (b)-> (c) same as the above. It is explanatory drawing regarding the measurement principle of a measurement sensor same as the above. It is a block diagram which shows a control system same as the above. It is a flowchart which shows a measurement procedure same as the above.

Explanation of symbols

2 base 3 projector 4 light receiver 6 measurement sensor X DUT

Claims (2)

  A base on which a measurement object with a lead is mounted in a mounted state, a light projector and a light receiver are arranged on both sides of the base, and the reference light from the light projector is captured by the light receiver and the measurement object An apparatus for measuring a dimension of an object to be measured, comprising a measurement sensor for measuring the dimension of the object, wherein the base is rotatable. A rotatable base is placed between the projector and receiver that make up the measurement sensor,
Mount the object to be measured with leads on the base in a mounted state,
A method for measuring the height of an object to be measured, comprising: measuring a dimension of the object to be measured by capturing the reference light from the light projector with the light receiver while rotating a base on which the object to be measured is mounted. .

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