JP6458694B2 - Aperture device and dimension measuring device - Google Patents

Description

  The present invention relates to a diaphragm device used in an optical system and a dimension measuring device using the diaphragm device.

2. Description of the Related Art Conventionally, a telecentric optical system is known in which a diaphragm is installed at a focal position of a lens and only a light beam parallel to the main axis of the lens is selectively imaged on the image side or the measurement object side of the lens. Since the dimension measuring apparatus using this telecentric optical system has almost no angle of view in the imaging of the measuring object, it is possible to measure the dimension of the measuring object in the direction perpendicular to the main axis of the lens from the imaging. Is possible.
The dimension measuring apparatus described in Patent Document 1 uses the telecentric optical system to change the position of the stop on a plane perpendicular to the main axis of the lens. The diaphragm of this dimension measuring device is formed at a position where a plurality of slits provided in the disk-shaped iris disk and an opening provided in the fixed diaphragm portion overlap. The plurality of slits are provided at different positions in the radial direction of the iris board. The opening of the fixed aperture portion extends in the radial direction of the iris board. When the iris board rotates, the position of the diaphragm moves in the direction in which the opening of the fixed diaphragm portion extends. As a result, the dimension measuring apparatus obtains an image in which the measurement object is viewed from the front without looking at the side surface of the measurement object even when the measurement object is inclined in the direction in which the opening of the fixed aperture portion extends. be able to. In addition, the imaging which looked at the measuring object from the front refers to the imaging which looked at the measuring object in parallel with the depth direction of the measuring object.

JP 2015-21733 A

However, in the dimension measuring apparatus described in Patent Document 1, when the measurement object is inclined not only in the direction in which the opening of the fixed aperture portion extends but also in the direction perpendicular to the direction, the measurement is performed. There is a problem that it is not possible to obtain an image when the object is viewed from the front. In order to solve this problem, in the dimension measuring apparatus described in Patent Document 1, if a driving unit for moving the fixed aperture part in a direction perpendicular to the direction in which the opening extends is provided, the dimension measuring apparatus uses an iris. Two driving units for driving the panel and the fixed throttle unit are provided. Therefore, there is a concern that the configuration of the dimension measuring device becomes complicated and the size of the size measuring device increases.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a diaphragm device that can be reduced in size with a simple configuration, and a dimension measuring device using the same.

The diaphragm device of the first invention is used as a diaphragm of an optical system and includes a fixed diaphragm unit (12), a movable diaphragm unit (13), and a drive unit (14). The fixed aperture portion has an opening (15) formed in a predetermined size at a position including the main axis (O) of the lens. The movable aperture section is provided at a position overlapping the fixed aperture section in the main axis direction, and has a plurality of aperture holes (11) provided on a plane including the focal position of the lens and perpendicular to the main axis of the lens. The drive unit moves the movable aperture unit along a plane perpendicular to the main axis of the lens. At this time, in the first aspect of the present invention, the drive unit moves the movable diaphragm unit linearly. Each of the plurality of apertures is spaced apart in the direction in which the movable aperture moves so that only one aperture overlaps the opening, and is shifted in a direction perpendicular to the direction in which the movable aperture moves Placed in position. In the second aspect of the present invention, the opening has a partition frame (20) for partitioning into a plurality of openings.

  Here, an orthogonal coordinate system in which the principal axis of the lens is the Z axis is defined, and the movable diaphragm portion moves along the X axis on the XY plane in the X axis direction. At this time, it can be said that each of the plurality of apertures is arranged apart in the X-axis direction so that only one aperture hole overlaps the opening, and is arranged at a position shifted in the Y-axis direction. For this reason, when the drive unit moves the movable aperture portion in the X-axis direction, the predetermined aperture hole overlaps the opening and moves in the X-axis direction. The aperture hole overlaps the opening and moves in the X-axis direction. Thereby, the diaphragm device can change the position of the diaphragm hole overlapping the opening to the X-axis direction and the Y-axis direction by the drive unit moving the movable diaphragm unit. Therefore, the diaphragm device can be reduced in size by simplifying the configuration of the drive unit.

  The second invention is an invention of a dimension measuring device using the diaphragm device of the first invention. In addition to the diaphragm device, the dimension measuring device includes an object side lens (3), an image side lens (4), a light irradiation unit (5), an imaging means (6), and an image processing means (7). The object side lens and the image side lens are arranged so that their principal axes and focal positions coincide with each other. The diaphragm device is provided so that the diaphragm hole is located on a plane that includes the focal positions of the object side lens and the image side lens and is perpendicular to the main axes of the object side lens and the image side lens. The light irradiation unit irradiates light from the measurement target side toward the object side lens and the image side lens. The imaging means images light that has been irradiated from the light irradiation unit and passed through the object side lens, the aperture hole, and the image side lens. The image processing means determines the smallest size of the images captured by the imaging means as the size of the measurement object.

  As a result, the light irradiated from the light irradiating unit and passing outside the outer edge of the object to be measured, parallel light inclined with respect to the main axis selectively passes through the aperture and forms an image with the imaging means. Therefore, by moving the aperture in the X-axis direction and the Y-axis direction, the image processing means can measure the measurement object regardless of whether the measurement object is tilted in the X-axis or Y-axis direction with respect to the main axis. It is possible to obtain an image viewed from the front. Therefore, this dimension measuring apparatus can accurately measure the size of the measurement object.

It is a block diagram of the dimension measuring apparatus by 1st Embodiment of this invention. It is an enlarged view of the II part of FIG. It is the top view which looked at the diaphragm | throttle device of 1st Embodiment from the image side lens side. It is explanatory drawing which shows operation | movement of the aperture_diaphragm | restriction apparatus of 1st Embodiment. It is explanatory drawing which shows operation | movement of the aperture_diaphragm | restriction apparatus of 1st Embodiment. It is a schematic diagram which shows the image which image | photographed the measurement target object of the state of FIG. It is a block diagram of the dimension measuring apparatus which shows the state in which the measuring object inclined with respect to the main axis | shaft. It is a schematic diagram which shows the image which image | photographed the measurement target object of the state of FIG. It is a block diagram of the dimension measuring apparatus which shows the state which moved the position of the aperture hole. FIG. 10 is an enlarged view of a portion X in FIG. 9. It is a schematic diagram which shows the image which image | photographed the measurement target object of the state of FIG. It is a top view of the diaphragm | throttle device of 2nd Embodiment. It is a top view of the diaphragm | throttle device of 3rd Embodiment.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A first embodiment of the present invention is shown in FIGS. The dimension measuring apparatus 1 according to the first embodiment measures the size of various measuring objects 2 such as a heat exchanger.
As shown in FIG. 1, the dimension measuring apparatus 1 includes an object side lens 3, an image side lens 4, a backlight 5 as a light irradiation unit, a CCD camera 6 as an imaging unit, a computer 7 as an image processing unit, and An aperture device 10 is provided.

  The backlight 5 is a surface light source, for example, and the measuring object 2 is installed on it. The backlight 5 irradiates light toward the object side lens 3 from the side opposite to the object side lens 3 of the measurement object 2. 1 is a rectangular parallelepiped, the dimension measuring device 1 of the present embodiment is not limited to a rectangular parallelepiped, and can measure the dimensions of the measuring object 2 having various shapes. .

  A lens barrel 8 is provided at a position away from the backlight 5 by a predetermined distance. An object side lens 3, an aperture device 10, an image side lens 4, and a CCD camera 6 are fixed to the lens barrel 8 in order from the measurement object 2 side. The object side lens 3 has a larger aperture than the image side lens 4. The main axis O of the object side lens 3 and the main axis O of the image side lens 4 coincide with each other. The focal position on the image side of the object side lens 3 and the focal position on the measurement object 2 side of the image side lens 4 coincide with each other. In the following description, the object side lens 3 and the image side lens 4 are referred to as “lenses 3 and 4”.

Here, for convenience of explanation, an orthogonal coordinate system is defined in which the main axis O of the lenses 3 and 4 is the Z axis.
The aperture device 10 has a plurality of aperture holes 11 used as apertures for the lenses 3 and 4. The aperture 11 includes the focal positions of the object side lens 3 and the image side lens 4 and can move along the X axis on an XY plane perpendicular to the Z axis. FIG. 1 shows a state in which any one of the plurality of aperture holes 11 of the aperture device 10 is on the main axis O of the object side lens 3 and the image side lens 4. The configuration and operation of the diaphragm device 10 will be described later.

  The CCD camera 6 has a CCD image sensor 61. The light emitted from the backlight 5 passes through the object side lens 3, the aperture 11 and the image side lens 4 and forms an image on the CCD image sensor 61 as indicated by a solid line L1 in FIG. The aperture 11 is light that is irradiated from the backlight 5 and passes through the measurement object 2, and is more parallel to the measurement object 2 than the object-side lens 3, and more CCD than the image-side lens 4. Only parallel light is selectively allowed to pass through on the camera 6 side. The CCD camera 6 converts the light imaged on the CCD image sensor 61 into an electric signal and transmits it to the computer 7. Thereby, the CCD camera 6 can capture an image directly in front of the measurement object 2. Note that the image in front of the head means an image obtained by viewing the measuring object 2 in parallel with the axis H in the depth direction of the measuring object 2.

  The computer 7 is electrically connected to the CCD camera 6 and controls the timing of imaging by the CCD camera 6. Further, the computer 7 displays on the display 9 an image of the measurement object 2 acquired by the electric signal transmitted from the CCD camera 6. The computer 7 determines the smallest size of the plurality of images taken by the CCD camera 6 as the size of the measurement object 2.

Next, the configuration and operation of the diaphragm device 10 will be described.
As shown in FIGS. 2 and 3, the diaphragm device 10 includes a fixed diaphragm unit 12, a movable diaphragm unit 13, and a drive unit 14.
The fixed diaphragm 12 is disposed on the measurement object 2 side of the image side lens 4 and is fixed to the inner wall of the lens barrel 8 by a support member (not shown). The fixed diaphragm portion 12 may be fixed to a guide member 16 fixed to the inner wall of the lens barrel 8. The fixed diaphragm 12 has an opening 15 formed in a predetermined size at a position including the main axis O of the lenses 3 and 4. The size of the opening 15 is larger than the diameter of one throttle hole 11. In FIG. 3, the opening 15 viewed from the Z-axis direction is rectangular, but the shape of the opening 15 is not limited to a rectangle, and various shapes can be adopted.

  The movable diaphragm 13 is provided via a block 17 on a guide member 16 fixed to the inner wall of the lens barrel 8 at a position overlapping the fixed diaphragm 12 in the direction of the main axis O. The movable diaphragm 13 can reciprocate in the X-axis direction on the XY plane along the guide member 16. The movable aperture 13 has a size that can always shield the opening 15 of the fixed aperture 12 when reciprocating in the X-axis direction.

  The movable diaphragm 13 has the plurality of diaphragm holes 11 described above. The plurality of aperture holes 11 are provided on an XY plane that includes the focal positions of the lenses 3 and 4 and is perpendicular to the main axis O of the lenses 3 and 4. The distance A between each aperture 11 and the aperture 11 is longer than the length B of the opening 15. For this reason, each of the plurality of apertures 11 overlaps only the aperture 15 when the movable aperture 13 moves along the X axis. Further, the respective throttle holes 11 and the throttle holes 11 are arranged at positions shifted in the Y-axis direction. Therefore, the diaphragm device 10 can change the diaphragm position of the lenses 3 and 4 in the Y-axis direction by changing the diaphragm hole 11 that overlaps the opening 15.

  The drive unit 14 includes a servo motor 18 and a ball screw 19. The servo motor 18 is driven and controlled by a command from the computer 7. The ball screw 19 is screwed into a female screw (not shown) provided in the block 17, and rotates around an axis by driving a servo motor 18. When the ball screw 19 rotates forward or backward, the block 17 and the movable restrictor 13 reciprocate along the X axis.

With reference to FIGS. 4 and 5, the operation of the diaphragm device 10 will be described.
In this description, the plurality of apertures 11 included in the movable aperture 13 are referred to as a first aperture 111, a second aperture 112, and a third aperture 113 from the right side of FIG. 4 and FIG. .
When the movable aperture 13 is located at the position shown in FIG. 4A, the first aperture 111 and the opening 15 overlap. When the servo motor 18 is driven and the movable aperture 13 moves from the position shown in FIGS. 4A to 4B, the first aperture 111 moves from the left side to the right side of the opening 15 along the X axis. . Note that the length of the arrow M described in FIGS. 4B and 4C and FIGS. 5D to 5F indicates the distance that the movable aperture 13 has moved from the position shown in FIG. Yes.

  Subsequently, when the movable aperture 13 is moved to the position shown in FIG. 4C, the second aperture 112 and the opening 15 overlap. As indicated by an arrow D in FIG. 4C, the first throttle hole 111 and the second throttle hole 112 are provided at positions shifted in the Y-axis direction. When the servo motor 18 is driven and the movable diaphragm 13 moves from the position shown in FIG. 4C to the position shown in FIG. 5D, the second diaphragm hole 112 extends from the left side to the right side of the opening 15 along the X axis. Moving.

  Next, when the movable aperture 13 is moved to the position shown in FIG. 5E, the third aperture 113 and the opening 15 overlap. As indicated by an arrow E in FIG. 5E, the first throttle hole 111 and the second throttle hole 112 are provided at positions shifted in the Y-axis direction. When the servo motor 18 is driven and the movable aperture 13 moves from the position shown in FIGS. 5E to 5F, the third aperture 113 moves from the left side to the right side of the opening 15 along the X axis. . In this way, the diaphragm device 10 moves the movable diaphragm 13 only in the X-axis direction by using a single servo motor 18 so that the diaphragm position of the lenses 3 and 4 is within the range of the opening 15. , It is possible to change in the X-axis direction and the Y-axis direction.

Then, the measuring method by the dimension measuring apparatus 1 is demonstrated.
1 and FIG. 2, the measurement object 2 is installed in a state where the main axis O of the lenses 3 and 4 and the axis H in the depth direction of the measurement object 2 are parallel, and the aperture hole 11 of the aperture device 10 is provided. The state located on the main axis | shaft O is shown. In this state, the light irradiated from the backlight 5 and passed outside the outer edge of the measurement object 2 is, as shown by a solid line L2 in FIGS. 1 and 2, the object side lens 3, the aperture 11, and the image side lens. 4 and forms an image on the CCD image sensor 61. At this time, the aperture 11 is light that has passed through the measurement object 2 and is parallel to the main axis O on the measurement object 2 side with respect to the object side lens 3 and on the CCD camera 6 side with respect to the image side lens 4. Then, only light parallel to the main axis O is selectively passed. Therefore, as shown in FIG. 6, an image G <b> 1 in front of the measurement object 2 is displayed on the display 9 of the computer 7. The computer 7 can measure the size of the measuring object 2 from the image G1.

  On the other hand, FIG. 7 shows a state in which the measuring object 2 is installed in a state where the axis H in the depth direction of the measuring object 2 is inclined with respect to the main axis O. In this state, when the aperture 11 is positioned on the main axis O, the aperture 11 is in the object side lens 3 out of the light that has passed outside the outer edge of the measurement object 2 as shown by the solid line L2 in FIG. Only light that is parallel to the main axis O on the measurement object 2 side and light that is parallel to the main axis O on the CCD camera 6 side than the image side lens 4 are selectively passed. Therefore, as shown in FIG. 8, the display 9 of the computer 7 displays an image G <b> 2 in which the measurement object 2 is viewed in parallel with the main axis O. This image G2 is larger than an image of the measuring object 2 viewed from the front.

Therefore, the dimension measuring device 1 drives the servo motor 18 of the aperture device 10 to move the movable aperture portion 13 in the X-axis direction. Thereby, the position of the aperture 11 moves in the X-axis direction and the Y-axis direction. 9 to 11, the measuring object 2 is installed with the axis H in the depth direction of the measuring object 2 tilted with respect to the main axis O, and the throttle hole 11 extends from the main axis O to the X-axis direction and the Y-axis. The state moved in the direction is shown. In this state, as shown by the solid line L2 in FIGS. 9 and 10, the aperture 11 has the measurement object 2 closer to the measurement object 2 than the object-side lens 3 out of the light that has passed through the measurement object 2. Only the light parallel to the axis H in the depth direction and the parallel light inclined with respect to the main axis O on the CCD camera 6 side than the image side lens 4 are selectively transmitted. Therefore, as shown in FIG. 11, an image G <b> 3 in front of the measurement object 2 is displayed on the display 9 of the computer 7.
The computer 7 images the measurement object 2 multiple times by the CCD camera 6 when the position of the aperture 11 moves in the X-axis direction and the Y-axis direction. Then, the computer 7 determines that the smallest size of the plurality of images captured by the CCD camera 6 is the size of the measurement object 2. Thereby, the dimension measuring apparatus 1 can accurately measure the size of the measuring object 2.

In the present embodiment, the following operational effects are achieved.
(1) In the diaphragm device 10 of the present embodiment, the plurality of diaphragm holes 11 provided in the movable diaphragm portion 13 are arranged apart from each other in the X-axis direction so that only one diaphragm hole 11 overlaps the opening portion 15. And disposed at a position shifted in the Y-axis direction. Therefore, by moving the movable diaphragm 13 in the X-axis direction by the drive unit 14, the position of the diaphragm hole 11 overlapping the opening 15 can be changed in the X-axis direction and the Y-axis direction on the XY plane. . Therefore, the diaphragm | throttle device 10 can make the structure of the drive part 14 simple, and can reduce the physique.

(2) The diaphragm device 10 of the present embodiment moves the movable diaphragm 13 linearly in the X-axis direction by the drive unit 14.
Thereby, the diaphragm | throttle device 10 can make the structure of the drive part 14 simple, and can reduce the physique.

(3) In the diaphragm device 10 of this embodiment, the size of the opening 15 is larger than the diameter of one throttle hole 11.
Thereby, the diaphragm | throttle device 10 can change the position of the aperture hole 11 which overlaps with the opening part 15 to an X-axis direction and a Y-axis direction.

(4) In the dimension measuring device 1 of the present embodiment, the aperture hole 11 of the aperture device 10 is installed on the XY plane including the focal positions of the lenses 3 and 4. The computer 7 determines the smallest size of the plurality of images taken by the CCD camera 6 as the size of the measurement object 2.
As a result, the aperture 11 moved away from the main axis O in the X-axis direction or the Y-axis direction selects only light parallel to the axis H in the depth direction of the measurement object 2 at a predetermined position within the range of the opening 15. Pass through. Therefore, the dimension measuring apparatus 1 can obtain an image G3 when the measuring object 2 is viewed from the front even when the measuring object 2 is inclined with respect to the main axis O in either the X axis or the Y axis. As a result, the size of the measurement object 2 can be accurately measured.

(5) The dimension measuring apparatus 1 according to the present embodiment images the measurement object 2 a plurality of times by the CCD camera 6 while the plurality of apertures 11 pass through the openings 15 as the movable aperture 13 moves. .
As a result, a plurality of images of the measuring object 2 are captured by parallel light inclined in the X-axis direction and the Y-axis direction with respect to the main axis O. Therefore, the computer 7 can accurately measure the size of the measurement object 2 by measuring the smallest one of the plurality of images.

(Second Embodiment)
A diaphragm device 10 according to a second embodiment of the present invention is shown in FIG. In the second embodiment, the fixed aperture portion 12 includes a partition frame 20 that partitions the opening 15 into a plurality of openings 151. The partition frame 20 is provided between the first throttle hole 111 and the second throttle hole 112 and between the second throttle hole 112 and the third throttle hole 113. The partition frame 20 extends in the X-axis direction. Therefore, the opening 15 included in the fixed diaphragm 12 is divided into three openings 151.
In the second embodiment, the diaphragm device 10 can increase the rigidity of the fixed diaphragm portion 12 by providing the partition frame 20 in the opening portion 15.
In the second embodiment, the partition frame 20 extends in the X-axis direction. However, the shape of the partition frame 20 is not limited to this, and may extend in the Y-axis direction. Good.

(Third embodiment)
A throttling device 10 according to a third embodiment of the present invention is shown in FIG. In the third embodiment, the movable aperture 13 has five apertures 11. Also in the third embodiment, the respective throttle holes 11 and the throttle holes 11 are arranged away from the length of the opening 15 and are arranged at positions shifted in the Y-axis direction.
In the third embodiment, the position of the aperture 11 can be finely changed in the Y-axis direction by moving the movable aperture 13 along the X-axis.

(Other embodiments)
(1) In the above-described embodiment, the diaphragm device 10 used in the dimension measuring device 1 to which the both-side telecentric optical system having the object side lens 3 and the image side lens 4 is applied has been described. On the other hand, in another embodiment, the diaphragm device 10 may be used in a dimension measuring device to which an image side telecentric optical system having only the image side lens 4 is applied. In another embodiment, the diaphragm device 10 may be used in a dimension measuring device to which an object side telecentric optical system having only the object side lens 3 is applied.

(2) In the embodiment described above, in the diaphragm device 10, the movable diaphragm unit 13 is disposed on the measurement object 2 side of the fixed diaphragm unit 12. On the other hand, in other embodiments, the movable diaphragm 13 may be disposed on the image side lens 4 side of the fixed diaphragm 12.

(3) In the embodiment described above, the movable diaphragm 13 has three or five diaphragm holes 11. On the other hand, in another embodiment, the number of the aperture holes 11 included in the movable aperture section 13 can be arbitrarily set according to the demand for measuring the dimensions of the measurement object 11.
Thus, the present invention is not limited to the above-described embodiments, and can be implemented in various forms within the scope of the invention in addition to combining the above-described plurality of embodiments.

DESCRIPTION OF SYMBOLS 1 ... Dimension measuring apparatus 2 ... Measurement object 3 ... Object side lens (lens)
4 ... Image side lens (lens)
DESCRIPTION OF SYMBOLS 10 ... Diaphragm device 11 ... Diaphragm hole 12 ... Fixed aperture part 13 ... Movable diaphragm part 14 ... Drive part 15 ... Opening part

Claims (7)

In a diaphragm device used as a diaphragm of an optical system lens (3, 4) for measuring the dimension of a measurement object (2),
A fixed aperture portion (12) having an opening (15) formed in a predetermined size at a position including the main axis (O) of the lens;
A movable aperture portion (13) provided in a position overlapping with the fixed aperture portion in the main axis direction and having a plurality of aperture holes (11) provided on a plane including the focal position of the lens and perpendicular to the main axis of the lens. )When,
A drive unit (14) that linearly moves the movable diaphragm along a plane perpendicular to the main axis of the lens,
Each of the plurality of apertures is disposed away from the movable aperture in a direction in which the movable aperture moves so that only one aperture is overlapped with the opening, and with respect to the direction in which the movable aperture moves A diaphragm device arranged at a position displaced in the vertical direction. The aperture device according to claim 1, wherein the drive unit moves only the movable aperture unit without moving the fixed aperture unit. The aperture device according to claim 1 or 2 , wherein the size of the opening is larger than the diameter of one aperture hole. The diaphragm device according to any one of claims 1 to 3 , wherein the fixed diaphragm section includes a partition frame (20) that partitions the opening into a plurality of openings. In a diaphragm device used as a diaphragm of an optical system lens (3, 4) for measuring the dimension of a measurement object (2),
A fixed aperture portion (12) having an opening (15) formed in a predetermined size at a position including the main axis (O) of the lens;
A movable aperture portion (13) provided in a position overlapping with the fixed aperture portion in the main axis direction and having a plurality of aperture holes (11) provided on a plane including the focal position of the lens and perpendicular to the main axis of the lens. )When,
A drive unit (14) for moving the movable diaphragm unit along a plane perpendicular to the main axis of the lens,
The opening has a partition frame (20) that divides into a plurality of openings, and each of the plurality of throttle holes moves in a direction in which the movable throttle part moves such that only one throttle hole overlaps the opening. And a diaphragm device that is disposed at a position shifted in a direction perpendicular to the direction in which the movable diaphragm portion moves. An object side lens (3) and an image side lens (4) arranged so that their principal axes and focal positions coincide with each other;
6. The diaphragm according to claim 1, wherein the aperture hole is provided so as to be positioned on a plane that includes focal positions of the object side lens and the image side lens and is perpendicular to a main axis of the object side lens and the image side lens. A diaphragm device according to claim 1;
A light irradiation unit (5) for irradiating light from the measurement object side toward the object side lens and the image side lens;
An imaging means (6) for imaging the light irradiated from the light irradiation unit and passed through the object side lens, the aperture hole, and the image side lens;
A dimension measuring apparatus comprising: an image processing unit (7) that determines an image captured by the imaging unit having a minimum size as the size of the measurement object.   The said image processing means images the said measuring object several times with the said imaging means, while the said some aperture hole passes each opening part with the movement of the said movable aperture | diaphragm | squeeze part. Dimension measuring device.

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