JP2010019714A - Displacement measuring equipment, seal member shape measuring apparatus using it and displacement detecting device used for them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure a light projecting part, a condensing function lens and a light receiving part so that they ensure a wide measuring range and meet the conditions of the Scheimpflug principle, to provide a shielding mask which prevents incidence of reflected light from the bottom of a measuring object having transmitting properties, and to prevent the occurrence of multiple reflection on the screening mask and the light receiving part. <P>SOLUTION: In this displacement measuring equipment, the measuring object, the condensing function lens 3 and the light receiving part 20 are disposed at positions where they meet the conditions of the Scheimpflug principle mutually, and an optical path of the reflected light from the surface of the measuring object to the light receiving part through the condensing function lens is provided at an angle exceeding 45 degrees to a normal on the surface of the measuring object. Moreover, the screening mask 6 is provided at a position where it blocks reverse-side reflected light transmitted through the measuring object, reflected on the reverse side of the object and passed through the condensing function lens from being incident on the light receiving surface of the light receiving part, and which is located within the range of an angle formed by adding an angle of incidence of condensed light to a normal on the light receiving surface and an angle of reflection of the condensed light incident at the angle of incidence to the normal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a displacement measuring device that triangulates the displacement of the surface of the object to be measured by irradiating the surface of the object to be measured with light (beam) and receiving the reflected light, and a seal member using the same The present invention relates to a shape measuring device and a displacement detecting device. In particular, according to the present invention, when measuring the surface shape of a thin transparent body as an object to be measured by an optical system configured so as to satisfy the conditions of Scheimpfig Principle, the surface from the back surface of the transparent body is measured. The present invention relates to a displacement measurement technique that can prevent the influence of unnecessary reflection on measurement.

  Conventionally, as a device for measuring displacement by triangulation, there is one shown in the prior art of Patent Document 1. The technique of this patent document 1 is provided with a shielding mask (body) movably provided in grooves provided above and below an optical displacement sensor (for example, PSD; Position Sensitive Detector), and a position detection sensor according to the displacement of the object to be measured. As the light receiving position (spot) moves, the light blocking body is moved to prevent unnecessary light from entering the position detection sensor.

  By the way, the object to be measured may measure the shape of a thin transparent body. For example, when a liquid crystal screen is manufactured, liquid crystal is stored in a bank formed by a sealing member applied to a transparent plate, and the shape of the sealing member may be measured. When measuring the shape of the sealing member at that time, the reflected light generated by the light transmitted through the sealing member being reflected by the back surface of the transparent plate may enter the position detection sensor as unnecessary reflected light. Need to prevent. However, there is no description up to that point in Patent Document 1.

  The prior art will be described with reference to FIGS. A structure of a general optical displacement sensor 103 is shown in FIG. In FIG. 6 (A1), the optical displacement sensor 103 includes a light projecting unit 10, a light receiving lens 3, and a light receiving unit 20, and the arrangement relationship thereof is integrally fixed by a housing (not shown), and the measured object. It is configured to be able to move relative to the object 101 so that scanning is possible. In FIG. 6A1, main scanning is performed in a direction (depth direction of the paper) perpendicular to a plane substantially including incident light and reflected light. FIG. 6A2 shows the area around the device under test 101 at the position indicated by the arrow A2 in FIG. 6A1, and the main scanning is performed in the main scanning direction in the order of the measuring point (A) and the measuring point (B). The state of incident light (scanning light) and reflected light is shown.

  In FIG. 6A1, the light projecting unit 10 includes a light source LD that generates light (laser beam), a collimator lens 1 that converts the light from the light source LD into parallel light, and the object to be measured by condensing the parallel light. A condensing lens 2 to be incident on 101 is provided. The light receiving lens 3 collects the reflected light from the DUT 101 on the light receiving unit 20 and forms an image. At this time, since the position of the reflected light received by the light receiving surface of the light receiving unit 20 including the position detecting means PSD changes according to the displacement of the object to be measured 101, even if the position of the light receiving unit 20 receiving the reflected light changes. In order to form an image well on the light receiving surface, the light receiving surface of the light receiving unit 20 (effectively the light receiving surface of the position detecting means PSD), the main surface (main surface) of the light receiving lens 3, and the incident light from the light projecting unit 10 It is necessary to configure the relationship so that these extension lines intersect at one point (the above Shine-Pluke condition). In the optical system having such a configuration, a shielding mask 9 is provided to prevent the unnecessary reflected light from entering the light receiving unit 20 from the bottom of the transparent object 101 to be measured.

  On the other hand, the light receiving unit 20 is determined by the incident angle and the reflection angle (inclination range) of the incident light from the light projecting unit 10 to the measured object 101 and the reflected light from the measured object 101 with respect to the normal on the surface of the measured object 101. The range that can be measured with the width (the depth in FIG. 6A1) is wide and narrow. That is, when the reflection angle θ1 with respect to the normal is steep as shown in FIG. 6 (B1), the reflected light is received as shown in FIG. 6 (B2) as viewed from the arrow B2 in FIG. 6 (B1). Even when not received by the portion 20, when the reflection angle θ2 is large as shown in FIG. 6 (C1), as shown in FIG. 6 (C2), which is a view seen from the arrow C2 of FIG. 6 (C1). If the width of the light receiving portion 20 is the same as that in FIG. 6B2, reflected light may be received. That is, when the reflection angle is increased as shown in FIG. 6C1, the measurement range in the width direction of the light receiving unit 20 is wider than when the reflection angle is reduced as shown in FIG. 6B1. In other words, from FIG. 6 (B2) and FIG. 6 (C2), the shorter the distance in the normal direction between the DUT 101 and the light receiving unit 20, the wider the measurement range in the width direction of the light receiving unit 20. I can say that. In addition, although the influence of the reflection angle of the reflected light with respect to the normal is large for the wide and narrow of the measurement range, generally, if the light receiving unit 20 receives the directly reflected light and the scattered reflected light, the incident light is generally approximately. Since the light receiving unit 20 and the light projecting unit 10 are arranged so that the incident angle of the reflected light and the reflected angle of the reflected light are equal to each other, the incident angle can be said to be the same as the reflected angle.

  Note that the “normal line on the surface of the object to be measured 101” is not a normal line in the strict sense here, but a so-called “line perpendicular to the tangent at the position of the surface where the normal line is to be set”. It is a line orthogonal to the average plane of the target surface or the main plane. Therefore, for example, if the DUT 101 is mounted on a flat plane, the plane may be a normal line with the plane as the main plane. Moreover, if the flat plane is horizontal, it may be a perpendicular line. Hereinafter, “normal line in...” Has the same meaning as described above.

  From the above, the reflection angle of the reflected light is increased due to the problem of the measurement range, and the light receiving surface of the light receiving unit 20, the main surface of the light receiving lens 3, and the light projecting unit at the intersection 30 as shown in FIG. In order to satisfy the Shine-Pluke condition by arranging the extended lines of incident light from 210 to intersect, the incident angle of the reflected light with respect to the normal line on the light receiving surface of the light receiving unit 20 becomes large.

  Incidentally, the light receiving unit 20 and the shielding mask 9 are arranged and configured as shown in FIG. In FIG. 7A, the light receiving unit 20 houses the position detecting means PSD in a case 7 having a transparent lid 8 that transmits light for protection. The shielding mask 9 is disposed on the transparent lid 8 at a position for preventing the incidence of unnecessary reflected light reflected from the bottom of the device under test 101. Note that if the DUT 101 in FIG. 6A1 is transmissive and the base 102 is a non-transparent material, “reflection from the bottom of the DUT 101” means that the DUT 101 The reflection from the back surface may be the reflection from the back surface of the base 102 if the base 102 is also a transparent body.

  In such a configuration of the light receiving unit 20, the incident angle of the reflected light with respect to the normal line standing on the light receiving surface of the light receiving unit 20 is increased in order to ensure a wide measurement range as described above and satisfy the Shine-Pluke condition. Then, as shown in FIG. 7A, the reflected light from the object to be measured 101 is once received by the position detecting means PSD, and then the reflection generated at the position received by the position detecting means PSD is shielded. The light hits the back surface of the mask 9 and again enters the position detecting means PSD to generate unnecessary light. When the position detection means PSD receives unnecessary light generated by multiple reflection between the position detection means PSD and the shielding mask 9 in this way, an error in displacement measurement is caused.

  FIG. 7B shows an example of the error. FIG. 7B shows a vertical direction of one of the optical displacement sensor 103 (the light projecting unit 10, the light receiving lens 3, and the light receiving unit 20) and the object to be measured 101 in FIG. 6A from the reference position (distance). In this case, the displacement (distance) is measured by the optical displacement sensor 103. The horizontal axis in FIG. 7B confirms the distance moved by another means, and the displacement measured by the optical displacement sensor 103 is the vertical axis. If each value is plotted, these values should be in a one-to-one relationship if normal and error free. However, as shown in the “error part” in the measurement range of FIG. 7B, the linearity is broken in the measurement range due to unnecessary light, and an error occurs.

JP-A-9-3198315

  An object of the present invention is to secure a wide measurement range for the light projecting unit, the condensing function lens (including the above-described light receiving lens), and the light receiving unit (including the PSD), and to satisfy the Scheinpluke conditions. In addition, it is an object of the present invention to provide a technique for preventing a multiple reflection caused by the shielding mask and the PSD from a shielding mask that prevents the incidence of reflected light from the bottom of the object to be measured having transparency.

  In order to achieve the above object, the invention according to claim 1 is directed to a light projecting unit (10) for irradiating a light-transmitting object to be measured to the surface of the object, and the object to be measured. A condensing function lens (3) that receives and collects reflected light from the surface of the lens, and a condensing position when the condensing function lens is disposed at the condensing position and receives the condensed light A light receiving unit (20) that outputs a signal according to the above, and the object to be measured, the condensing functional lens, and the light receiving unit are displacement measuring devices arranged at positions that satisfy the conditions of Shine-Pluke mutually. A position where the light reflected from the back side of the object to be measured is reflected on the bottom side of the object to be measured and is blocked from entering the light receiving unit by the back surface reflected light passing through the condenser lens. The incident angle of the focused light with respect to the normal at the surface, and the focused light incident at the incident angle There provided with a shielding mask (6) provided in a position within the angular range plus a reflective angle to the normal line when reflected by the surface of the light receiving portion.

  The invention according to claim 2 is the prism according to claim 1, wherein the cross-sectional shape is a prism having three sides, and the longest first side among the three sides is on the surface of the light receiving unit. It is arranged along the direction in which the condensing position moves according to the displacement of the object to be measured and faces the condensing function lens side among the three sides when arranged. A prism (5) provided with the shielding mask having a surface along the second side is provided on the second side.

  According to a third aspect of the present invention, in the second aspect of the invention, the light receiving unit receives the condensed light and detects the condensing position that moves with the displacement of the object to be measured. The position detecting means (PSD) for outputting a signal corresponding to the light collecting position, and the position detecting means are received, and the reflected light condensed from the light collecting function lens is received and transmitted to the position. A receiving case (7) having a transmission surface that is incident on the detection means, wherein the prism is attached with the first side in close contact with the transmission surface, and the reflected light collected from the condensing function lens; Is configured to enter the position detecting means via the prism.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the optical path of the reflected light from the surface of the object to be measured through the condenser lens to the light receiving unit is the measured object. It was set as the structure provided in the angle over 45 degree | times with respect to the normal line in the surface of an object.

  According to a fifth aspect of the present invention, there is provided a light projecting unit that irradiates light on a surface of a sealing member applied to a transparent plate and forming a bank for accommodating liquid crystal in a liquid crystal screen device (10), a condensing function lens (3) that receives and collects reflected light from the surface of the seal member, and a light receiving surface that is disposed at the condensing position where the condensing function lens condenses. A light receiving portion (20) that receives the collected light, detects the light collecting position that moves with the displacement of the surface shape of the seal member, and outputs a signal corresponding to the light collecting position; The seal member, the condensing function lens, and the light receiving unit are arranged at positions satisfying the conditions of Shine-Pluke and measure the shape of the seal member based on a signal output from the position detection means An apparatus for measuring a shape of a seal member, wherein the seal The optical path of the reflected light from the surface of the material through the condensing function lens to the light receiving unit is provided at an angle exceeding 45 degrees with respect to the normal line on the surface of the seal member. A position where the back surface reflected light that has passed through the transparent plate and reflected by the back surface of the transparent plate and passed through the condensing function lens is blocked from entering the light receiving surface of the light receiving unit, and is relative to the normal line on the light receiving surface A shielding mask (6) provided at a position within an angle range obtained by adding an incident angle of the collected light and a reflection angle of the collected light incident at the incident angle with respect to the normal line; It was.

  According to a sixth aspect of the present invention, there is provided a position detection means (PSD) having a light receiving surface for receiving incident measurement light and outputting a signal corresponding to the light receiving position at which the measurement light is received by the light receiving surface. A receiving case (7) having a transmitting surface for receiving the position detecting means and allowing the light to be measured to enter the receiving position detecting means, and a prism having a cross section of three sides, A prism (5) attached so that the longest first side faces the light receiving surface of the position detecting means and is along the moving direction of the light receiving position, and the prism Among the three sides, provided along the second side facing the side on which the light to be measured arrives, unwanted reflected light arriving at an incident angle lower than the angle of incidence of the light to be measured with respect to the normal on the light receiving surface A shielding mask (6) for blocking incidence, the shielding mask receiving the light receiving It has a structure which is positioned within the angular range of plus and reflection angle with respect to 該被 measurement light normal line of the incident at an incident angle and the incident angle of the light to be measured with respect to normal at.

  According to the configuration of the present invention, the light projecting unit, the condensing function lens, and the light receiving unit (including PSD) are configured to satisfy the Shine-Pluke conditions, thereby maintaining measurement accuracy and in the object to be measured. After ensuring a measurement range by providing a large reflection angle with respect to the normal, the shielding mask was added with the incident angle of the collected light and the reflection angle of the reflected light from the object to be measured. Since it is provided at a position within the angular range, generation of unnecessary light due to multiple reflection can be prevented, and measurement can be performed with reduced errors.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram for explaining an embodiment of an optical displacement sensor according to the present invention. FIG. 2 is a diagram illustrating the configuration of the displacement detection device and illustrating the prevention of multiple reflection. FIG. 3 is a diagram showing a configuration of a displacement measuring unit (displacement measuring device). FIG. 4 is a diagram illustrating a configuration of an inspection unit as a shape inspection apparatus. FIG. 5 is a diagram illustrating a configuration of a seal member as an object to be measured.

[Optical displacement sensor and displacement detector]
Here, the light projecting unit 10 including the light source LD, the collimator lens 1 and the condenser lens 2 in FIG. 1A, the light receiving lens (functional lens), the light receiving unit 20, the shielding mask 6 and the prism 5 are received. A displacement detection device composed of elements will be described. Each part (element) in FIGS. 1A, 1B, and 2 that has the same reference numerals as those in FIGS. 6 and 7 has the same function and function. Therefore, here, a description will be given mainly of parts different from FIG. 6 and FIG.

In FIG. 1A, the light projecting unit 10 causes the light (laser beam) from the light source LD to be incident on the surface of the object to be measured 101, and the incident angle θ with respect to the normal line on the surface of the object to be measured 101 at that time. ₀ is set to 45 degrees or more so as to be the same as the reflection angle θ described below. The light reflected by the surface of the object to be measured 101 and reflected by the surface of the object to be measured 101 at the reflection angle θ ₀ is condensed by the light receiving lens 3 and formed on the light receiving unit 20. The reflection angle θ ₀ formed by the optical path of the reflected light from the surface of the object to be measured 101 to the light receiving unit 20 through the light receiving lens 3 is between 45 degrees and about 70 degrees. It is set to either. As described above, this is to widen the measurement range with respect to the lateral width of the position detection means PSD in the light receiving unit 20 (the width in the depth direction (main scanning direction) in FIG. 1A).

The incident light from the light projecting unit 10 to the surface of the object 101, the main surface of the light receiving lens 3 (the surface at the center in the thickness direction of the light receiving lens 3), and each extension line of the light receiving surface of the light receiving unit 20 are 1 The two intersections 30 are arranged so as to intersect. In other words, since the conditions of Shine-Pluke are satisfied, even if the reflection angle θ ₀ of the reflected light changes due to the inclination of the measured object 101 in FIG. An image can be formed. Therefore, accurate position information can be obtained.

  The light receiving unit 20, the prism 5, and the shielding mask 6 constitute a displacement detection device. FIG. 2A shows a specific configuration thereof. 2A, the light receiving unit 20 includes a position detection unit PSD, a case 7 that houses the position detection unit PSD, and a transparent lid 8 that transmits light made of glass or the like in the case 7. . Then, the prism 5 having a triangular cross section is bonded to the transparent lid 8 on the surface with the longest long side, and the side on the side receiving the reflected light from the object 101 to be measured among the remaining two sides of the triangular shape. A shielding mask 6 is fixed to the surface. The shielding mask 6 is a position for preventing the reflected light from the bottom of the object to be measured 101 from entering the position detecting means PSD, and is incident between the reflected light from the object to be measured 101 and the normal line on the transparent lid 8. An angle range obtained by combining the angle θ and the angle θ between the reflected light from the object to be measured 101 and the reflected light reflected by the surface of the position detecting means PSD and the normal line (in FIG. θ). Therefore, multiple reflections on the surfaces of the shielding mask 6 and the position detection means PSD can be prevented, and measurement errors due to multiple reflections can be prevented.

  Outputs A and B, which are signals including information indicating the light receiving position of the reflected light, are output from both ends of the position detecting means PSD as shown in FIG. These signals include information corresponding to the displacement on the surface of the object 101 to be measured, and how to use it will be described later in “Displacement measuring device”.

  An aspect in which reflected light (fine dotted lines) from the bottom of the object 101 to be measured by the shielding mask 6 (the back surface of the base 102 because the base 102 in FIG. 1A is transparent) is shielded by the shielding mask 6 and position detection means A mode of re-reflected light based on reflected light on the PSD light-receiving surface is shown in FIG. In FIG. 1A, the reflected light from the object to be measured 101 is received by the light receiving unit 20 (position detecting means PSD) and at the same time, part of the reflected light is re-reflected on the surface, and among the three sides of the prism 5, Multiple reflections can be reduced because the longest side and the other side excluding the side facing the object to be measured 101 are removed to the outside. On the other hand, unnecessary reflected light from the bottom of the DUT 101 is blocked from entering the light receiving unit 20 by the shielding mask 6. When the base 102 is opaque, unnecessary reflected light is reflected from the base 102.

  Further, as described above, the use of the prism 5 does not affect the reception of the reflected light by the position detection means PSD because it passes light itself, and the shielding mask 6 is removed from the object to be measured 101 as described above. The angle of incidence θ formed by the reflected light and the normal to the transparent lid 8 and the angle θ formed by the reflected light reflected from the object to be measured 101 reflected by the surface of the position detecting means PSD and the normal θ are combined. This is because it is easy to set. Supporting the shielding mask 6 is not limited to the prism 5, and as shown in FIG. 2 (B), mask struts 6 a are fixedly provided on both sides in the width direction of the light receiving unit 20 so as to sandwich the position detecting means PSD, and the shielding mask 6 6 may be provided. Further, although the shielding mask 6 is fixed, a guide rail may be provided on the mask mounting surface of the prism 5 or the mask column 6a to change the position.

  Although the light receiving lens 3 is used in FIG. 1A, the configuration shown in FIG. 1B can be employed instead of the light receiving lens 3. That is, it is possible to adopt a configuration in which the reflected light from the object to be measured 101 is converted into parallel light by the collimator lens 3a, condensed by the condenser lens 3b, and imaged on the light receiving unit 20. The expression “condensing function lens” in the claims is used for that purpose, and the same function and performance can be achieved by a single lens or a plurality of lenses, and therefore they are expressed as a whole.

[Displacement measuring device]
An embodiment of a displacement measuring device using the above-described optical displacement sensor 103 will be described with reference to FIG.

  In FIG. 3, the optical displacement sensor 103 is the same as the optical displacement sensor 103 described with reference to FIGS. In the optical displacement sensor 103, the light source LD and the position detecting means PSD in FIG. 1 are representatively described. In FIG. 7, the control unit 105, the scanning mechanism 104, the computing unit 106, and the data processing unit 107 constitute a displacement measuring unit 100.

  The control unit 105 in FIG. 3 includes layout information (coordinate (position) information of a range in which the surface is measured) necessary for scanning and measuring the surface of the device 101 in advance. ) And the sub-scanning range in the direction orthogonal to the main scanning direction (paper surface direction in FIG. 1) and the number of times are determined based on the layout. Instructed to start scanning. On the other hand, position information during scanning, that is, position information of measurement points is output.

  The scanning mechanism 104 includes a driving mechanism and means for moving the optical displacement sensor 103 and the object 101 to be measured relatively in the main scanning direction and in the sub scanning direction in accordance with an instruction from the control unit 105. For example, these means perform main scanning by linearly moving the optical displacement sensor 103 in the main scanning direction, and move the object to be measured 101 in a direction orthogonal to the main scanning direction when one main scanning is completed. Thus, the measurement point measured by the optical displacement sensor 103 is relatively scanned.

  The computing unit 106 computes and outputs an output L = (A−B) / (A + B) as displacement information based on the outputs A and B, which are signals output from the position detecting means PSD which is a light receiving element.

  If only the measurement point and the displacement are plotted as the displacement measuring device, the data processing unit 107 outputs the output (displacement z) of the computing unit 106 with respect to the position information (x, y) of the measurement point from the control unit 105. And plot it. The data processing unit 107 is for reproducing the cross-sectional shape of the surface of the measured object 101 as a three-dimensional image or a main-scanned portion based on the output of the computing unit 106 and the position information of the control unit 105. is there. It is output as shape data representing a shape in which the main scanning direction, the sub-scanning direction, and the displacement direction are three-dimensional or two-dimensional.

[Seal member shape measuring device]
As one specific embodiment of the displacement measuring device, when producing a liquid crystal screen device, a dike (seal member) is provided on a plate-like surface and the liquid crystal is thinly accommodated therein. An example in which the displacement of the shape of the object 101 is measured to obtain the cross-sectional shape will be described.

  1 to 3 can be used as they are. Here, the outline and scanning of the DUT 101 will be mainly described.

  FIGS. 5A and 5B show a seal member 101a that is a device under test 101. FIG. FIG. 5B shows a cross section taken along the line AA * in FIG. As shown in FIG. 1, the seal member 101a as the object to be measured 101 is composed of a transparent glass 101b constituting a liquid crystal screen and a transparent seal member 101a applied along the periphery thereof in a square frame shape. For example, the optical displacement sensor 103 is main-scanned from the bottom to the top in FIG. 5A, and the shape of the seal member 101a on the side of the square frame shape, that is, the seal member 101a as shown in FIG. Measure the cross-sectional shape. If the entire cross-sectional shape in the length direction of the seal member 101a is to be measured, it is necessary to perform sub-scan in the length direction to change the position and perform the main scan. Sub-scanning is not performed. Further, when main scanning is performed from the left side to the right side in FIG. 5A, the cross-sectional shape of the seal member 101a on the vertical side of the square frame shape is measured.

  Since a holding table (not shown) is placed under the glass 101b, in this case, the reflected light from the bottom of the glass 101b (the surface where the base 102 comes into contact with the surface of the holding table is unnecessary). The reflected light is shielded by the shielding mask 6.

  The data processing unit 107 plots the output L from the computing unit 106 according to the main scanning position, thereby obtaining shape data indicating the cross-sectional shape of the seal.

[Shape inspection device]
An embodiment used for a shape inspection apparatus that inspects the displacement of the surface of the object to be measured 101 using the displacement measuring apparatus using the optical displacement sensor 103 described above will be described with reference to FIG. For example, a case will be described in which the seal member 101a is used as the object to be measured 101, the displacement of the shape thereof is measured, and an inspection for determining whether the seal is good is performed. The control unit 105, the comparison unit 202, the determination unit 203, and the display unit 204 constitute an inspection unit 200. As the displacement measuring device for the seal member 101a using the optical displacement sensor 103, the embodiment shown in FIG. 3 can be used as it is.

  The comparison unit 202 receives a design value or the like related to the cross-sectional shape of the seal member 101a from the control unit 105 as a reference (height or area), and calculates a difference between the image data received from the data processing unit 107 and the reference. Output. Note that the difference between the displacement measured at the measurement point (the measured height of the seal member 101a) and the reference (designed height of the seal member 101a) may be output without converting into shape data.

  The determination unit 203 receives the allowable value corresponding to the reference from the control unit 105 and compares it with the output from the comparison unit 202. If the output of the comparison unit 202 is within the allowable value, the determination unit 203 determines that the output is acceptable. If so, it is determined to be defective (no).

  The display unit 204 displays the determination result of the determination unit 203. In addition, layout information (for example, a layout drawing showing the form and position of the seal member 101a) is received from the control unit 105 and displayed so that it is possible to identify which position in the layout is defective (or not) and passed. May be. In addition to or in combination with them, an image based on the shape data generated by the data processing unit 107 can be displayed so that it is possible to identify which part is defective and passed.

It is a typical block diagram for demonstrating embodiment of the optical displacement sensor which concerns on this invention. It is a figure for showing prevention of multiple reflection while showing with the composition of a displacement detection device. It is a figure which shows the structure of a displacement measuring part (displacement measuring apparatus). It is a figure which shows the structure of the test | inspection part as a shape test | inspection apparatus. It is a figure which shows the structure of the sealing member as a to-be-measured object. It is a figure which shows the structure of a prior art. It is a figure for demonstrating the fault of a prior art.

Explanation of symbols

1 collimator lens, 2 condensing lens, 3 light receiving lens (condensing function lens),
3a collimator lens, 3b condenser lens, 5 prism, 6 shielding mask,
6a Mask post, 7 Case, 8 Transparent lid, 9 Shielding mask,
10 light emitter, 20 light receiver, 30 intersection,
DESCRIPTION OF SYMBOLS 100 Displacement measurement part (displacement measuring apparatus), 101 to-be-measured object, 101a sealing member
101b glass, 102 base, 103 optical displacement sensor,
104 scanning mechanism, 105 control unit, 106 arithmetic unit, 107 data processing unit,
200 inspection unit 202 comparison unit 203 determination unit 204 display unit
LD light source, PSD position detection means

Claims (6)

A light projecting unit (10) for irradiating light onto the surface of the object to be measured and a condensing function lens for receiving and converging the reflected light from the surface of the object to be measured (translucent object to be measured) 3) and a light receiving unit (20) that outputs the signal according to the light collecting position when the light collecting functional lens is disposed at the light collecting position and receives the condensed light, The object to be measured, the condensing function lens, and the light receiving unit are displacement measuring devices arranged at positions that satisfy the conditions of Shine-Pluke mutually,
A position on the surface of the light-receiving unit, which is a position where the back-surface reflected light that has passed through the object to be measured and reflected on the bottom side of the object to be measured passes through the condenser lens and enters the light-receiving unit. An angle range obtained by adding an incident angle of the collected light with respect to a line and a reflection angle with respect to the normal line when the collected light incident at the incident angle is reflected by the surface of the light receiving unit And a shielding mask (6) provided at the position of.   The prism has a cross-sectional shape of three sides, and the longest first side among the three sides faces the surface of the light receiving unit, and the condensing position according to the displacement of the object to be measured. The shield having a surface along the second side on the second side facing the condenser lens, among the three sides when arranged along the moving direction of the lens The displacement measuring device according to claim 1, further comprising a prism (5) provided with a mask.   The light receiving unit receives the collected light, detects the light collecting position that moves with the displacement of the object to be measured, and outputs a signal corresponding to the light collecting position (PSD). And a receiving case (7) having a transmitting surface for receiving the position detecting means, receiving the transmitted reflected light from the condensing function lens, and transmitting the reflected light to the position detecting means. The prism is attached with the first side in close contact with the transmission surface, and the reflected light collected from the condenser lens is incident on the position detecting means via the prism. The displacement measuring device according to claim 2.   The optical path of the reflected light from the surface of the object to be measured through the condenser lens to the light receiving unit is provided at an angle exceeding 45 degrees with respect to the normal line on the surface of the object to be measured. The displacement measuring apparatus as described in any one of Claims 1-3. A sealing member applied to a transparent plate and forming a bank for accommodating liquid crystal in a liquid crystal screen device, a light projecting section (10) for irradiating light on the surface of the sealing member, and a sealing member A condensing function lens (3) for receiving and reflecting the reflected light from the surface; and a light receiving surface disposed at the condensing position where the condensing function lens condenses the collected light. A light receiving portion (20) for detecting the condensing position that moves with the displacement of the surface shape of the seal member and outputs a signal corresponding to the condensing position. The functional lens and the light receiving unit are arranged at positions satisfying the conditions of Shine pluke with each other, and are a seal member shape measuring device that measures the shape of the seal member based on a signal output from the position detecting means. ,
The optical path of the reflected light from the surface of the seal member through the condensing function lens to the light receiving unit is provided at an angle exceeding 45 degrees with respect to the normal line on the surface of the seal member,
A position where the back surface reflected light transmitted through the sealing member and the transparent plate and reflected by the back surface of the transparent plate and passed through the condenser lens is blocked from entering the light receiving surface of the light receiving unit; A shielding mask provided at a position within an angle range obtained by adding the incident angle of the collected light with respect to the normal to the surface and the reflection angle of the collected light incident at the incident angle with respect to the normal (6) The sealing member shape measuring apparatus characterized by the above-mentioned. A position detecting means (PSD) having a light receiving surface for receiving incident light to be measured, and outputting a signal corresponding to the light receiving position at which the light to be measured is received by the light receiving surface;
A housing case (7) having a transmission surface for housing the position detecting means and allowing the light to be measured to enter the receiving position detecting means;
The prism has a cross section of three sides, and the longest first side of the three sides faces the light receiving surface of the position detecting unit and is along the direction in which the light receiving position moves. A closely attached prism (5);
Among the three sides of the prism, the prism is provided along the second side facing the side on which the light to be measured arrives, and arrives at an incident angle lower than the incident angle of the light to be measured with respect to the normal line on the light receiving surface. A shielding mask (6) for blocking incidence of unnecessary reflected light, and the shielding mask includes an incident angle of the measured light with respect to a normal line on the light receiving surface and the measured light incident at the incident angle. A displacement detection device provided at a position within an angle range including a reflection angle with respect to a normal line.

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