JP4653573B2 - Measuring jig for projector - Google Patents

Description

  The present invention relates to a measurement jig for a projector, and in particular, for example, the planar portion of a member to be measured that includes a planar portion and a hollow portion that is provided to open to the planar portion and has an inner surface perpendicular to the planar portion. The present invention relates to a measuring jig for a projector for measuring the dimensions of a non-right angle portion such as a rounded portion or a chamfered portion that connects the inner surface of a hollow portion.

  Conventionally, as this kind of measuring jig for a projector, for example, there is one disclosed in Patent Document 1. According to this prior art, a jig for measuring the width direction and a jig for measuring the depth direction have been proposed. Among these, as a specific example of the width direction measuring jig, a short cylindrical body fixed to the flat plate in a state where one end surface is in contact with a flat plate arranged obliquely and a first support surface which is an upper surface of the flat plate Are disclosed. In addition, the short cylinder body is provided with a screw hole extending from one end face toward the other end face side, and a screw is screwed into the screw hole from the lower face side of the flat plate, thereby the short cylinder body. And the flat plate are fixed. And as a member to be measured, a ball bearing inner ring having a flat end surface and an inner hole having an inner peripheral surface perpendicular to the end surface, and a rounded portion is formed between the end surface and the inner peripheral surface of the inner hole, This ball bearing inner ring is mounted on a width direction measuring jig by inserting (fitting) a short cylindrical body into the inner hole from the end face (R portion) side. Accordingly, the end surface of the ball bearing inner ring comes into surface contact with the first support surface of the flat plate, and the inner peripheral surface of the inner hole comes into contact with the second support portion formed by the outer peripheral surface (bus bar) of the short cylindrical body. . Further, the flat plate is observed for observing the rounded portion sandwiched between the end surface in contact with the first support surface and the inner peripheral surface of the inner hole in contact with the second support portion from the lower surface side of the flat plate. A hole is provided. Therefore, the rounded portion is observed through the observation hole, and an enlarged image of the rounded portion is projected on the projection screen. Then, from the enlarged image projected on the projection screen, the dimension of the rounded portion, specifically, the width dimension in the direction along the end face of the ball bearing inner ring (in other words, the radial direction of the ball bearing inner ring) is measured.

  On the other hand, as a specific example of the depth direction measuring jig, a configuration including a flat plate disposed obliquely and a short columnar member fitted and fixed in a circular hole formed in the flat plate is disclosed. . The short columnar member is fitted into the circular hole from the lower surface side of the flat plate so as to protrude toward the third support surface which is the upper surface of the flat plate. And the upper surface of the collar provided in the edge part edge of a short cylindrical member is contact | abutting to the lower surface of the flat plate, The said short cylindrical member is being fixed to the flat plate with this collar. Furthermore, an observation hole formed by cutting from the heel side is provided in the short cylindrical member, and the observation hole is inclined 45 degrees with respect to the axis of the short cylindrical member. A plane reflecting mirror is provided. And the ball bearing inner ring | wheel as a to-be-measured member is mounted | worn with a depth direction measurement jig | tool by inserting a short cylindrical member from the end surface (Ru part) side into the inner hole. Thereby, the end surface of the ball bearing inner ring is in surface contact with the third support surface of the flat plate, and the inner peripheral surface of the inner hole is in contact with the fourth support portion formed by the outer peripheral surface (bus bar) of the short columnar member. . Then, the rounded portion sandwiched between the end surface in surface contact with the third support surface and the inner peripheral surface of the inner hole in contact with the fourth support portion is observed through the observation hole and the plane reflecting mirror, and an enlarged image thereof. Is projected onto the projection screen. From this enlarged image, the dimension of the rounded portion, specifically, the depth dimension in a direction perpendicular to the end face of the ball bearing inner ring (in other words, the axial direction of the ball bearing inner ring) is measured.

JP 2002-99044 A

  However, the above-described conventional technology has the following problems. That is, with respect to the width direction measuring jig, a screw hole is provided in the short columnar body to fix the short columnar body to the flat plate, so that the size of the short columnar body, particularly the diameter (outer diameter) is at least a screw. It becomes larger than the diameter (inner diameter) of the hole. Specifically, although depending on the size of the screw hole, the diameter of the short cylindrical body is approximately 10 [mm] or more. Therefore, in the conventional width direction measuring jig, the dimension (for example, inner diameter) of the hollow portion of the measurement target member into which the short cylindrical body is inserted must be larger than 10 [mm], which satisfies this condition. If it does not say, there exists a problem that it cannot respond to a small to-be-measured member.

  On the other hand, as for the depth direction measuring jig, since a single plane reflecting mirror is built in the short cylindrical member (observation hole), at least the size of the short cylindrical member, in particular, the diameter is determined. Dimensions that can be embedded are required. Specifically, although depending on how small the planar reflecting mirror can be, the diameter of the short columnar member is approximately 10 [mm] or more. That is, the depth direction measuring jig also has a problem that it cannot cope with a small member to be measured whose hollow portion has a dimension of 10 [mm] or less, like the above-described width direction measuring jig.

  Accordingly, an object of the present invention is to provide a measuring jig for a projector that can cope with a member to be measured that is smaller than the conventional one, and that can realize this extremely easily and inexpensively.

In order to achieve such an object, the first invention provides a planar portion of a member to be measured, which includes a planar portion and a hollow portion provided so as to open to the planar portion and having an inner surface perpendicular to the planar portion. In a measuring jig for a projector for measuring the dimensions of a non-perpendicular part that connects to the inner surface, such as a rounded part or a chamfered part, is perpendicular to the observation direction by the projector and is the same as the observation direction a first base portion having a first supporting surface for contacting flat portion and the surface of the measuring member with facing direction, the viewing direction from the first supporting surface of the first base portion is fixed to the first base portion And a columnar first insertion portion that protrudes in the same direction and is inserted into the hollow portion of the member to be measured. And the surface including the 1st support surface of the 1st base part is set as a focusing surface of a projector, and the side wall of the 1st insertion part and the inner surface of the hollow part of a member to be measured in the direction along an observation direction linearly to form a first contact portion for contacting. Furthermore, it located in-focus plane, and with facing in a direction opposite to the direction of observation, first from the first contact portion so as to form a first corner of a right angle between the first abutment 1 the reference plane formed toward the inside of the insertion portion, comprising. In addition, the 1st corner | angular part which the 1st contact part and the reference plane comprise, and the said 1st corner | angular part along a focusing surface among the connection parts of the plane part and non-right angle part of a to-be-measured member A region including a portion facing the first observation region is a first observation target region that is an observation target according to the first invention. The first base portion is configured to be able to observe the first observation target region from the direction according to the observation direction, and includes, for example, a through hole or a notch. Furthermore, the first insertion portion is formed by the head portion of a screw-like member having a columnar head portion and a screw portion protruding from one end surface of the head portion along the length direction of the head portion. . Then, the screw portion of the screw-like member is screwed to the first base portion, whereby the first insertion portion formed by the head portion of the screw-like member is fixed to the first base portion. Further, the cross section of the screw portion, specifically, the cross section that crosses the protruding direction of the screw portion is inside the one end face of the head. That is, there is a portion where the screw portion is not provided on one end face of the head. And the above-mentioned reference plane was formed by the part in which this screw part is not provided, It is characterized by the above-mentioned.

That is, when the member to be measured is attached to the projector measuring jig according to the first aspect of the invention, the flat surface portion of the member to be measured comes into surface contact with the first support surface of the first base portion. First supporting surface of the first base unit, so located focal plane of the projector, the plane portion of the measuring member to be in surface contact to the first supporting surface is also located in the focal plane. And the column-shaped 1st insertion part is inserted in the hollow part of a to-be-measured member, and the inner surface (bus line) of the said hollow part is linearly formed in the 1st contact part formed of the side wall of this 1st insertion part. Abut. The first abutting portion extends in a direction along the observation direction, and forms a first corner that is perpendicular to the reference plane located on the focusing surface. Then, the a first corner portion, the portion facing the first corner of the connecting portion between the flat portion and the non-right-angled portions of the measuring member, and the part closest to the first corner in other words, the region containing is a first observation target region. The first observation target region is observed from a direction according to the observation direction, in other words, from a direction perpendicular to the focal plane, and an image according to the observation result is projected by the projector.

Here, a clear projection image is obtained for a portion of the first observation target region located on the focal plane, for example, a flat portion of the member to be measured. On the other hand, a clear projection image cannot be obtained for a portion that is not located on the focal plane, for example, a non-perpendicular portion of the member to be measured, which is a blurred image. Therefore, from the projection image of the plane portion and the projection image of the non-right angle portion, the connection portion (boundary) between the plane portion and the non-right angle portion, in other words, one end of the non-right angle portion can be known. Further, since the reference plane is also located on the in-focus plane, a clear projection image can be obtained. Therefore, from the projected image of the reference plane and the projected image of the non-right angle portion, the boundary between the reference plane and the non-right angle portion, in other words, the first plane formed by the reference plane and the first contact portion . You can see the corner. The position of the first corner overlaps the position of the other end of the non-right angle portion on the projection image. Therefore, by measuring the distance between the position of the first corner and the position of one end of the non-right angle portion on the projected image, the dimension between one end and the other end of the non-right angle portion, strictly speaking, The so-called width dimension in the direction along the flat surface of the measuring member can be obtained.

Furthermore, in this 1st invention, the 1st head itself of the screw-shaped member which has a columnar head and the thread part which protruded along the length direction of the said head from the one end surface of this head is 1st. An insertion part is formed. That is, the head of the screw-like member is inserted into the hollow portion of the member to be measured, and a first contact portion that contacts the inner surface of the hollow portion is formed by the side wall of the head. Then, by screwing the screw portion of the screw-like member to the first base portion, the first insertion portion formed by the head portion of the screw-like member is fixed to the first base portion. That is, the first insertion portion itself is provided with means for fixing it to the first base portion. And the reference plane which comprises the above-mentioned 1st corner | angular part is formed by the part in which the screw part is not provided among the one end surfaces of the head, specifically the said one end surface.

  In addition, it is desirable that the reference plane has the same surface state as the plane portion of the member to be measured. That is, when the planar portion of the member to be measured and the reference plane are in the same surface state, both ends of the non-right-angled portion sandwiched between them are more easily understood on the projected image.

In the second invention, the same member to be measured as in the first invention is the object of measurement, and is perpendicular to the observation direction by the projector and faces the same direction as the observation direction. together with the measuring member with a second base portion having a second support surface which contacts the plane portion and the surface of the measuring member, protruding toward the same direction as the viewing direction in the second support surface of the second base portion A second insertion portion inserted into the hollow portion. And the 2nd insertion part is provided with the 2nd contact part which contacts the inner surface of the hollow part of a member to be measured. The second base portion, an observation hole penetrating in a direction along the observation direction and having a perpendicular inner wall to the second supporting surface is provided so as to open the second support surface is provided with. Further, the inner wall of the observation hole forms a reference surface. Specifically, the reference surface is located on the same plane as the surface including the second contact portion and parallel to the direction along the observation direction. The reference surface is oriented in the same direction as the portion of the inner surface of the hollow portion that is in contact with the second contact portion. Then, the surface including the reference surface is set as the focusing surface of the projector. In this second aspect of the invention, perpendicular to the second corner portion formed by the reference surface and the second supporting surface of the second base portion, the connection between the inner surface and the non-orthogonal portion of the hollow portion of the measuring member A region including a portion facing the second corner along the focal plane in the portion is set as a second observation target region as an observation target. And the exposure space for exposing this 2nd observation object area | region outside through the observation hole provided in the 2nd base is provided in the 2nd insertion part. Further, in this exposure space, the focal plane is optically opposed to the observation direction so that the second observation target region can be observed through the observation hole and the exposure space from the direction according to the observation direction. Are provided. The reflecting mirror is formed integrally with the wall surface by subjecting the wall surface forming the exposed space to predetermined processing.

That is, when the member to be measured is attached to the measuring jig for a projector according to the second aspect of the invention, the flat portion of the member to be measured comes into surface contact with the second support surface of the second base portion. And the 2nd insertion part which protrudes in the 2nd support surface side of the 2nd base part is inserted in the hollow part of a member to be measured. At this time, the second contact portion provided in the second insertion portion, abuts against the inner surface of the hollow portion. On the other hand, an observation hole is provided in the second base portion, and a reference surface is formed by the inner wall of the observation hole. The reference surface is located on the same plane as the portion in contact with the second contact portion of the inner surface of the hollow portion, and faces the same direction as the contact portion. Further, since the reference surface is located on the focusing surface of the projector, the abutting portion, specifically, the generatrix portion of the inner surface of the hollow portion including the abutting portion is also located on the focusing surface. . Furthermore, a perpendicular second corner portion formed by the reference surface and the second supporting surface of the second base portion, the along the focal plane of the connection portion between the inner surface and the non-orthogonal portion of the hollow portion first a portion facing the second corner portion, the second observation target region including the via exposed space and the aforementioned observation hole provided in the second insertion portion is exposed to the outside. And this 2nd observation object area | region is observed through an observation hole and exposure space from the direction according to an observation direction, ie, the direction along a focusing surface. In order to enable such observation, a reflecting mirror is provided in the exposure space to optically face the focal plane in the observation direction.

Here, a clear projection image is obtained for a portion of the second observation target region located on the focal plane, for example, the generatrix portion of the inner surface of the hollow portion described above. On the other hand, a clear projection image cannot be obtained for a portion that is not located on the focal plane, for example, a non-right-angle portion of the member to be measured, resulting in a blurred image. Therefore, from the projection image of the hollow portion inner surface (bus line portion) and the non-right angle portion projection image, the hollow portion inner surface and the non-right angle portion connection portion (boundary), in other words, one end of the non-right angle portion can be known. In addition, since the reference surface is located on the in-focus surface, a clear projection image can be obtained. Therefore, from a projection image of the projection image and a non-right-angled portion of the reference surface, formed between these reference surfaces and the boundary between the non-right-angled portions, i.e. the reference surface when the second supporting surface of the second base portion position of the second corner is seen. The position of the second corner overlaps the position of the other end of the non-right angle portion on the projection image. Therefore, by measuring the distance between the position of the second corner and the position of one end of the non-right angle portion on the projected image, the dimension between both ends of the non-right angle portion, strictly speaking, the measurement target The so-called depth dimension in a direction perpendicular to the plane portion of the member can be determined.

Furthermore, in the second invention, the above-described reflecting mirror is formed by performing a predetermined process on the wall surface forming the exposure space, in other words, the second insertion portion itself. The predetermined processing here refers to, for example, mirror polishing processing, aluminum vapor deposition processing, or the like.

  The reference surface is preferably in the same surface state as the inner surface of the hollow portion. In other words, if the reference surface and the inner surface of the hollow portion are in the same surface state, the images at both ends of the non-right-angled portion sandwiched between them can be easily understood on the projected image.

  The third invention includes a slide table to which the width direction measuring jig of the first invention and the depth direction measuring jig of the second invention are attached. The slide table is slid to selectively install the width direction measurement jig and the depth direction measurement jig at their respective use positions, that is, predetermined positions appropriate for measuring dimensions. It is configured to be able to.

  That is, in the third invention, since both the width direction measuring jig and the depth direction measuring jig are provided, it is possible to cope with both the width direction dimension measurement and the depth direction dimension measurement. In addition, which measurement jig is used for the dimension measurement can be arbitrarily selected by sliding the slide table.

According to the first invention, it is possible to measure the width dimension of the non-perpendicular part formed between the flat part of the member to be measured and the inner surface of the hollow part. And in the case of this measurement, a 1st insertion part is inserted in the hollow part of a to- be-measured member , but this 1st insertion part is a screw-like part protrudingly provided by the columnar head and one end surface of this head Are formed by the head itself. Therefore, in comparison with the short cylindrical body in the conventional width direction measurement jig described above that are responsible for the actions similar to the first insertion portion, the first insert portion size can be reduced, and thus more compact (hollow dimensions of parts is small) may correspond to the measurement member. In addition, since the first insertion portion and the screw portion that is a means for fixing the first insertion portion to the first base portion are integrally formed by one screw-like member, a fixing screw is provided separately from the short cylindrical body. Compared to the required conventional width direction measuring jig, the entire jig can be configured very simply and inexpensively.

According to the second invention, it is possible to measure the depth dimension of the non-perpendicular part formed between the flat part of the member to be measured and the inner surface of the hollow part. And in the case of this measurement, the 2nd insertion part which has a reflective mirror is inserted in the hollow part of a to- be-measured member . Here, the said reflecting mirror is formed of the 2nd insertion part itself (wall surface of exposure space). Therefore, unlike the short cylindrical member at the second insertion portion and are responsible for the actions of the same conventional depth direction measuring jig described above, it is not necessary to incorporate a single plane reflecting mirror, correspondingly, the second insert The dimension of the portion can be reduced, and as a result, a smaller member to be measured can be handled. The configuration of the whole jig is extremely simple and inexpensive.

  According to the third aspect of the present invention, both the width direction measuring jig and the depth direction measuring jig are provided, and it is arbitrarily determined which measurement jig is used for the measurement only by sliding the slide table. You can choose. Therefore, the dimension measurement in the width direction and the dimension measurement in the depth direction can be performed easily and quickly.

  An embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, for example, a substantially cylindrical ball bearing inner ring 10 as shown in FIG. 1 is a member to be measured. That is, this ball bearing inner ring 10 has a circular opening shape having flat both end faces 12 and 14 and both end faces 12 and 14 and an inner face 16 perpendicular to both end faces 12 and 14. And an inner hole 18. Further, a rounded portion 20 as a non-perpendicular portion is formed over the periphery of the opening of the inner hole 18 located on the one end face 12 side (lower side in FIG. 1). The dimension of the rounded portion 20, specifically, the width dimension W in the direction along the one end surface 12 (in other words, the radial direction of the ball bearing inner ring 10) and the direction perpendicular to the one end surface 12 (in other words, the ball bearing). The so-called depth dimension D in the axial direction of the inner ring 10 is measured by the projector 30 described below. In addition, although the width dimension W and the depth dimension D of the rounded portion 20 depend on the size of the ball bearing inner ring 10 (particularly, the diameter (inner diameter) φs of the inner hole 18), they are generally 0.3 [mm] to 1.0. [Mm].

  As shown in FIG. 2, the projector 50 includes a base portion 52 and a head portion 54 provided above the base portion 52. In addition, an inclined sample mounting table 56 is provided at a portion (right side in FIG. 2) that hits the front surface of the base portion 52, and the sample mounting table 56 has a slide table that can slide along the horizontal direction. 100 is attached. Further, a width direction measuring jig 200 and a depth direction measuring jig 300 described later are attached to the slide table 100, and a member to be measured is attached to the width direction measuring jig 200 and the depth direction measuring jig 300. The above-described ball bearing inner ring 10 is selectively mounted.

  For example, when measuring the width dimension W, the ball bearing inner ring 10 is mounted on the width direction measuring jig 200. When the slide table 100 slides, the width dimension direction jig 200 is installed at a use position, that is, a predetermined position suitable for measuring the width dimension W. On the other hand, when measuring the depth dimension D, the ball bearing inner ring 10 is mounted on the depth direction measuring jig 200. Then, as the slide table 100 slides, the depth direction measuring jig 200 is installed at a use position, that is, a predetermined position suitable for measuring the depth dimension D.

  In this way, the ball bearing inner ring 10 is mounted on any of the measuring jigs 200 or 300, and the measuring jig 200 or 300 mounted with the ball bearing inner ring 10 is installed at its use position. When the projector 50 is turned on (for example, a power switch (not shown) is turned on), as shown by solid line arrows 58, 58,... In FIG. Illumination light is irradiated toward the ball bearing inner ring 10 from a coaxial incident light source. The illumination light 58, 58,... Is reflected by the surface of the ball bearing inner ring 10, and the reflected light is shown by a dotted arrow 60 in FIG. And the screen 70 provided on the front surface of the head unit 54 through an optical system including As a result, a projected image of the ball bearing inner ring 10, strictly, a projected image of an observation target area described later is displayed on the screen 70. And the above-mentioned width dimension W or depth dimension D is measured from this projection image. Although not shown in the drawing, the screen 70 is provided with a scale corresponding to the magnification of the projection lens 62, and the width dimension W and the depth dimension D can be measured using this scale.

  Now, the width direction measuring jig 200 is configured as shown in FIG. 3, for example. That is, the width direction measuring jig 200 has a rectangular flat plate-shaped base portion 202 and a columnar insertion portion 206 that protrudes from the upper surface 204 of the base portion 202 in a direction perpendicular to the upper surface 204. is doing. Further, a substantially elliptical observation hole 210 is formed in the base portion 202 so as to penetrate from the upper surface 204 to the lower surface 208. And the insertion part 206 is being fixed to the base part 202 so that a part of periphery of this observation hole 210 may be covered.

  Here, the insertion portion 206 is formed by a screw-like member 212. Strictly speaking, the screw-like member 212 includes a columnar head and a screw portion (male screw) 214 projecting from one end surface of the head along the length direction of the head. The insertion part 206 is comprised by the head of these. The diameter (outer diameter) φa of the insertion portion 206 is smaller than the diameter (screw diameter) of the screw portion 214. For example, the diameter φa of the insertion portion 206 is φa = 5 [mm]. The screw diameter of 214 is M2.6. In addition, the height dimension Ha of the insertion portion 206 is at least larger than the depth dimension D of the rounded portion 20 of the ball bearing inner ring 10, for example, Ha = 8 [mm]. The base portion 202 is provided with a screw hole (female screw) 216 into which the screw portion 214 is screwed. With this screwing, the entire screw-like member 212 including the insertion portion 206 is connected to the base portion 202. Fixed to. At this time, one end surface of the insertion portion 206, specifically, a portion 218 of the one end surface where the screw portion 214 is not provided, covers a part of the periphery of the observation hole 210 as described above. Then, it will be in the state exposed in the observation hole 210. The exposed portion 218 coincides with a plane including the upper surface 204 of the base portion 202 and faces the side opposite to the upper surface 204 (the lower surface 208 side of the base portion 202). The exposed portion 218 becomes a reference plane that is referred to when the width dimension W is measured, as will be described later.

  Furthermore, through holes 220, 220,... For screw insertion for screwing the entire width direction measuring jig 200 including the base portion 202 to the slide table 100 are provided at appropriate locations (three locations) of the base portion 202. , Provided. The thickness t of the base portion 202 is, for example, t = 3 [mm].

  The thus configured width direction measuring jig 200 is installed in an inclined state as shown in FIG. 4A by being attached to the projector 50 (sample mounting table 56) together with the slide table 100. . Specifically, it is installed so that the upper surface 204 of the base portion 202 faces obliquely upward and the observation hole 210 is positioned above the insertion portion 206. Then, as the slide table 100 slides, the width direction measuring jig 200 is set to the use position. At this time, the upper surface 204 of the base portion 202 is positioned on a focal plane by the projector 50 (projection lens 62). And the ball bearing inner ring | wheel 10 is mounted | worn with the width direction measuring jig 200 installed in the use position in this way as follows.

  That is, the ball bearing inner ring 10 is attached to the width direction measuring jig 200 by inserting the insertion portion 206 of the width direction measuring jig 200 into the inner hole 18 from the side where the rounded portion 20 is formed. . Thereby, the one end surface 12 of the ball bearing inner ring 10 is in surface contact with the upper surface 204 of the base portion 202 (excluding the portion where the observation hole 210 is provided). At the same time, a part (bus line part) of the inner surface 16 of the ball bearing inner ring 10 linearly contacts a part (bus line part) of the side wall 222 of the insertion portion 206. This state is naturally formed and maintained by the weight of the ball bearing inner ring 10.

  By mounting the ball bearing inner ring 10 in this way, the observation hole 210 is viewed from the projection lens 62 side, that is, from the direction according to the observation direction (irradiation direction of illumination light) indicated by the arrow 400 in FIG. Through this, the ball bearing inner ring 10 can be observed. Accordingly, when the projector 50 is turned on in this state, an area that can be observed through the observation hole 210, that is, a part of the one end surface 12 of the ball bearing inner ring 10, the above-described reference plane 218, and these A projected image of the observation target region including the rounded portion 20 sandwiched between the two is projected onto the screen 70.

  Here, referring to FIG. 4B, for example, one end surface 12 of the ball bearing inner ring 10 in the observation target region is in surface contact with the upper surface 204 of the base portion 204 as described above. Since the upper surface 204 is positioned on the focusing surface as a reference surface, naturally, the one end surface 12 of the ball bearing inner ring 10 is also positioned on the focusing surface. Therefore, a clear (so-called sharp) projection image can be obtained with respect to the one end surface 12 located on the focusing surface. On the other hand, the rounded portion 20 is not located on the focal plane and is inclined with respect to the observation direction, so that a clear projection image cannot be obtained, which is a blurred image. Therefore, from the projection image of the one end surface 12 and the projection image of the rounded portion 20, the connecting portion (boundary) between the one end surface 12 and the rounded portion 20, in other words, the one end 22 of the rounded portion 20 is known.

  Since the reference plane 218 is located on the focal plane as well as the one end surface 12 of the ball bearing inner ring 10, a clear projection image can be obtained. Therefore, from the projection image of the reference plane 218 and the projection image of the above-described rounded portion 20, the boundary between the reference plane 218 and the rounded portion 20, in other words, the side wall of the reference plane 218 and the insertion portion 206 (described above). The position of the corner portion 224 formed by the generated bus portion 222) can be seen. The position of the corner portion 224 overlaps the position of the other end 24 of the rounded portion 20 on the projection image. Therefore, by measuring the distance between the position of the corner portion 224 and the position of the other end 24 of the rounded portion 20 described above on the projected image, the dimension between both ends 22 and 24 of the rounded portion 20, that is, The width dimension W can be determined.

  On the other hand, the depth direction measuring jig 300 is configured as shown in FIG. That is, the depth direction measuring jig 300 includes a base portion 304 having a generally disc shape (in other words, a short columnar shape) having a flange-like flange (鍔) 302, and an upper surface 306 of the base portion 304 to the upper surface 306. A substantially cylindrical insertion portion 308 protruding in a direction perpendicular to the insertion portion 308. Among these, an observation hole 312 having a circular opening is formed in the base portion 304 so as to penetrate the central portion from the upper surface 306 to the lower surface 310.

  The insertion portion 308 is formed so that the side wall 314 of the insertion portion 308 coincides with the inner wall 316 of the observation hole 312 when viewed from above. Further, an inclined surface 318 is formed at a lower portion of the insertion portion 308 and faces obliquely downward 45 degrees. The inclined surface 318 is also continuous inside the observation hole 312, and the inclined surface 318 is mirror-finished. That is, the reflector 318 tilted obliquely is provided in the vicinity of the opening above the observation hole 312.

  The diameter (outer diameter) φb of the insertion portion 308 is, for example, substantially the same as the diameter φa of the insertion portion 206 on the width direction measuring jig 200 side, that is, φb = 5 [mm]. The dimension Hb from the upper surface 306 of the base 304 to the upper end of the reflecting mirror (inclined surface) 318 is at least larger than the depth dimension D of the rounded portion 20 of the ball bearing inner ring 10, for example, Hb = 3 [Mm].

  The insertion portion 308 is formed by a substantially L-shaped cutting member 320. The cutting member 320 includes an insertion portion 308 and a fixing portion 322 provided at a right angle to the insertion portion 308. The fixing portion 322 is fixed to the base portion 304 with two screws 324 and 324 in a state where the insertion portion 308 is protruded from the upper surface 306 of the base portion 304. The mirror surface processing for forming the above-described reflecting mirror 318 is performed before the cutting member 320 is fixed to the base 304. That is, it is applied in the state of the cutting member 320 alone. Furthermore, through holes 326 and 326 for screw insertion for screwing the entire depth direction measuring jig 300 including the base portion 304 to the slide table 100 at appropriate locations (two locations) of the flange 302 of the base portion 304. Is provided.

  The depth direction measuring jig 300 thus configured is installed in an inclined state as shown in FIG. 6A by being attached to the projector 50 (sample mounting table 56) together with the slide table 100. . Specifically, it is installed such that the upper surface 306 of the base portion 304 faces obliquely upward and the upper end of the reflecting mirror 318 is positioned upward. Then, when the slide table 100 slides, the depth direction measuring jig 300 is set to the use position. At this time, a portion of the inner wall 316 of the observation hole 312 corresponding to the ridge line (a line representing the inner wall 316 located on the upper side in FIG. 6A) (bus line portion) is projected through the reflector 318. It is located on the 50 focal plane. Note that the ridge line portion of the inner wall 316 located on the in-focus surface forms a reference surface that is referred to when the depth dimension D is measured. Further, a portion (bus line portion) corresponding to a ridge line (a line representing the side wall 314 located on the upper side in FIG. 6A) of the side wall 314 of the insertion portion 308 is also located on the in-focus plane. And the ball bearing inner ring | wheel 10 is mounted | worn with the depth direction measuring jig 300 installed in the use position in this way as follows.

  That is, the ball bearing inner ring 10 is attached to the depth measurement jig 300 by inserting the insertion portion 308 of the depth measurement jig 300 into the inner hole 18 from the side where the rounded portion 20 is formed. . As a result, the one end surface 12 of the ball bearing inner ring 10 comes into surface contact with the upper surface 306 of the base portion 304. At the same time, a part (bus line portion) of the inner surface 16 of the ball bearing inner ring 10 comes into contact with the above-described ridge line portion of the side wall 314 of the insertion portion 308. This state is naturally formed and maintained by the weight of the ball bearing inner ring 10.

  By mounting the ball bearing inner ring 10 in this manner, the observation includes a portion located on the focusing surface, that is, a part of the inner surface 16 of the ball bearing inner ring 10 and a part of the inner wall 316 of the observation hole 312. The target region is exposed to the lower surface 310 side of the base portion 304 through a part of the space 328 of the inner hole 18 of the ball bearing inner ring 10 and the observation hole 312. The space 328 and the observation hole 312 are provided with the above-described reflecting mirror 318. The reflecting mirror 318 has both a focal plane and an observation direction indicated by an arrow 400 in FIG. In other words, the focal plane is optically opposed to the observation direction 400 in other words. Therefore, the observation target region located on the in-focus plane can be observed from the direction according to the observation direction 400 via the reflecting mirror 318. In this state, when the projector 50 is turned on, a projection image of the observation target area is displayed on the screen 70.

  Here, referring to FIG. 6B, the above-described reference surface (ridge line portion) formed by the portion located in the focusing surface as the reference surface in the observation target region, for example, the inner wall 316 of the observation hole 312. ), A clear projection image is obtained. On the other hand, the rounded portion 20 adjacent to the reference surface 316 is not located on the focusing surface and is inclined obliquely with respect to the observation direction via the reflecting mirror 318, so that the projection is clear. The image cannot be obtained and the image becomes blurred. Therefore, the projected image of the reference surface 316 and the projected image of the rounded portion 20 form a boundary between the reference surface 316 and the rounded portion 20, in other words, the reference surface 316 and the upper surface 306 of the base portion 304. The position of the corner 330 is known. Since the position of the corner 330 overlaps the position of the one end 22 of the rounded portion 20 on the projected image, the position of the corner 330 can be regarded as the position of the one end 22 of the rounded portion 20.

  And since the above-mentioned ridgeline part of the inner surface 16 of the ball bearing inner ring 10 is also located on the in-focus surface, the projected image is clearly projected. Therefore, the connection portion (boundary) between the ridge line portion 16 and the rounded portion 20, that is, the other end 24 of the rounded portion 20 can be found from the projected image of the ridge line portion 16 and the projected image of the rounded portion 20 described above. Therefore, by measuring the distance between the position of the other end 24 of the rounded portion 20 and the position of the corner portion 330 on the projected image, the dimension between both ends 22 and 24 of the rounded portion 20, that is, A depth dimension D can be determined.

  Note that the above-described corner portion 330 is set at the center of the observation target region. The distance L from the corner portion 330 to the reflecting mirror 318 in the direction perpendicular to the observation direction 400 is equal to the thickness dimension t of the base portion 202 of the width direction measuring jig 200 described above (L = t). It is said that.

  Furthermore, the slide table 100 is configured as shown in FIG. That is, the slide table 100 has a substantially rectangular flat base plate 102 fixed to the sample mounting table 56 of the projector 50, and is parallel to the base plate 102 at a distance from each other along the horizontal direction. It has two rails 104 and 104 provided so as to extend, and a table portion 106 that slides along the two rails 104 and 104.

  The table portion 106 includes two flat plates 110 and 112 that are overlapped via spacers 108, 108,..., And the lower flat plate 110 is engaged with the rails 104 and 104. Here, three wheels 114, 114,... Are provided. Then, the width direction measuring jig 200 and the depth direction measuring jig 300 are attached to the upper flat plate 112 in a substantially horizontal state.

  Specifically, the width direction measuring jig 200 is fixed to the right side portion of the flat plate 112 with the lower surface 208 being in surface contact with the upper surface 116 of the flat plate 112. This fixing is performed by screwing through the through holes 220, 220,. The flat plate 112 is provided with an observation hole 118 that is slightly larger than the observation hole 210 corresponding to the observation hole 210 of the width direction measuring jig 200 (base portion 202). A similar through hole 120 is also provided in the lower flat plate 110.

  On the other hand, the depth direction measuring jig 300 is attached to the left side portion of the flat plate 112 so that the upper surface 306 is at the same height as the upper surface 116 of the flat plate 112. For this reason, a fitting hole 122 for fitting the base portion 304 (cylindrical portion) of the depth direction measuring jig 300 is provided at a position on the left side of the flat plate 112. The depth direction measuring jig 300 is fixed to the flat plate 112 with the base portion 304 fitted into the through hole 122 from the lower surface 124 side of the flat plate 112. This fixing is performed by screwing through the through holes 326 and 326 described above. Then, by aligning the position of the upper surface 306 of the depth direction measuring jig 300 with the position of the upper surface 116 of the flat plate 112 in this way, the position of the upper surface 306 of the depth direction measuring jig 300 becomes the upper surface of the width direction measuring jig 200. The distance L (= t) described above is lower than the position 204, and as a result, the focusing surface as the reference surface is uniformly aligned between the measuring jigs 200 and 300. Further, the lower flat plate 110 is provided with an observation hole 126 that is slightly larger than the observation hole 312 corresponding to the observation hole 312 of the depth direction measuring jig 300 (base portion 304).

  When the table unit 106 to which the measurement jigs 200 and 300 are attached in this way is slid to the left side, for example, the width direction measurement jig 200 is used at its use position, for example, the base plate 102 (sample mounting table 56). It is moved to the upper approximate center position. On the other hand, when the table unit 106 is slid to the right side, the depth direction measuring jig 300 is set at a substantially central position on the base plate 102 as in the use position, for example, the width direction measuring jig 200. FIG. 7 shows a state where the depth direction measuring jig 300 is set to the use position. In addition, the base plate 102 is provided with stoppers 128 and 130 for determining the use positions of the measuring jigs 200 and 300, that is, for positioning. Further, an observation through-hole 132 is provided at a substantially central portion of the base plate 102.

  As described above, according to this embodiment, it is possible to select which measurement jig 200 or 300 is used simply by sliding the slide table 100 (table unit 106). That is, both the measurement of the width dimension W and the measurement of the depth dimension D of the rounded portion 20 can be easily and quickly handled.

  And about the width direction measurement jig | tool 200, the diameter (phi) a of the insertion part 206 is 5 [mm]. Accordingly, the diameter φs of the inner hole 18 of the ball bearing inner ring 10 into which the insertion portion 206 is inserted may be at least larger than 5 [mm], for example, 10 [mm]. That is, according to the width direction measuring jig 200 of this embodiment, even a small member to be measured whose diameter of the hollow portion is 10 [mm] or less, which cannot be handled by the conventional width direction measuring jig, It can respond sufficiently. This is because the insertion portion 206 is formed by a screw-like member 212 (head) itself having a screw portion 214 as its fixing means. Therefore, if a smaller one (the diameter φa of the insertion portion 206) is adopted as the screw-like member 212, it is possible to cope with a smaller member to be measured, for example, up to about φs = 2 [mm]. Can do. Further, as described above, since the insertion portion 206 and the screw portion 214 as its fixing means are integrally formed, for example, compared with the case where the insertion portion 206 and the fixing means are provided separately, the width direction measuring treatment is performed. The entire configuration of the tool 200 can be further simplified and the cost can be reduced.

  In addition, since the diameter φb of the insertion portion 308 is set to 5 [mm], the depth direction measuring jig 200 can correspond to a member to be measured that is smaller than the conventional depth direction measuring jig. it can. This is because the reflection mirror 318 for bending the observation direction 400 is formed by the insertion portion 308 (the cutting member 320) itself. Therefore, if the insertion portion 308 is reduced in size within a range in which the reflecting mirror 318 can be formed, it is possible to cope with a smaller member to be measured, for example, up to about φs = 2 [mm]. it can. Further, unlike the conventional depth direction measuring jig, it is not necessary to provide a single plane reflecting mirror, so that the entire configuration of the depth direction measuring jig 300 can be further simplified and the cost can be reduced.

  In this embodiment, the ball bearing inner ring 10 is taken as an example of the member to be measured, but this is not a limitation. That is, it is only necessary to have a flat part and a hollow part provided so as to open to the flat part and having an inner surface perpendicular to the flat part.

  Moreover, the dimension of the non-right-angle part of other aspects, such as a chamfering part, for example, can also be measured not only in the round part 20.

  Furthermore, with respect to the width direction measuring jig 200, an insertion portion 206 is provided so as to cover a part of the periphery of the observation hole 210, and a part of one end surface 218 of the insertion portion 206 (for reference) is provided via the observation hole 210. The observation target region including the plane is observed, but the present invention is not limited to this. For example, an insertion part 206 is provided so as to cover a part of one side edge of the base part 202 (that is, at the last part of the one side edge), and the reference plane 206 is provided via the one side edge of the base part 202. The observation target region including the image may be observed.

  Further, the screw-like member 212 in this embodiment is specially formed by, for example, cutting, but is not limited thereto. That is, instead of the screw-shaped member 212, for example, a commercially available screw having a head having a function similar to that of the insertion portion 206 (in other words, a substantially cylindrical shape), a threaded spacer, or the like may be employed.

  In place of the screw-like member 212, a so-called pin-like member may be employed. That is, instead of being screwed to the base portion 202, the insertion portion 206 may be formed by a pin-like member fixed to the base portion 202 by fitting. In this case, however, the above-described reference plane 218 is naturally formed.

  Further, the one end surface 218 of the insertion portion 206 forming the reference plane may be processed into the same surface state as the one end surface 12 of the ball bearing inner ring 10. In this way, both ends 22 and 24 of the rounded portion 20 sandwiched between the reference plane 206 and the one end surface 12 of the ball bearing inner ring 10 become clearer on the projected image, and the rounded portion 20 It is effective in measuring the width dimension W of the.

  And about the depth direction measurement jig | tool 300, you may improve the reflectance of the said reflective mirror 318 by performing surface treatments, such as aluminum vapor deposition, on the reflective mirror 318 further. Further, the corrosion resistance of the reflecting mirror 318 may be improved by forming a corrosion-resistant film on the reflecting mirror 318.

  Further, the inner wall 316 of the observation hole 312 that forms the reference surface described above may be processed into the same surface state as the inner surface 16 of the ball bearing inner ring 10. In this way, both ends 22 and 24 of the rounded portion 20 sandwiched between the reference surface 316 and the inner surface 16 become clearer on the projected image, and the depth dimension D of the rounded portion 20 is measured. It is effective to do.

  The specific structure of the slide table 100 is not limited to that shown in FIG.

  Further, the present invention may be applied to a projector 50 that includes a camera instead of the screen 70.

It is a longitudinal cross-sectional view which shows the structure of the ball bearing inner ring | wheel as a to-be-measured member in one Embodiment of this invention. It is a schematic longitudinal side view which shows the whole structure of the projector in the same embodiment. It is a figure which shows schematic structure of the width direction measurement jig | tool in the embodiment. It is an illustration figure which shows the state by which the to-be-measured member of FIG. 1 is mounted | worn with the width direction measurement jig | tool of FIG. It is a figure which shows schematic structure of the depth direction measurement jig | tool in the embodiment. It is an illustration figure which shows the state by which the to-be-measured member of FIG. 1 is mounted | worn with the depth direction measurement jig | tool of FIG. It is a figure which shows schematic structure of the slide table in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ball bearing inner ring | wheel 12 One end surface 16 Inner surface 18 Inner hole 20 Round part 50 Projector 100 Slide table 200 Width direction measuring jig 202 Base part 204 Upper surface 206 Insertion part 210 Observation hole 212 Screw-shaped member 218 Reference plane 222 Side wall 224 Angle Part 300 Depth direction measurement jig 304 Base part 306 Upper surface 308 Insertion part 312 Observation hole 314 Side wall 316 Reference surface 318 Reflector 328 Space 330 Corner part 400 Observation direction

Claims (4)

A dimension of a non-perpendicular portion connecting the planar portion and the inner surface of the member to be measured, which includes a planar portion and a hollow portion provided to open to the planar portion and having an inner surface perpendicular to the planar portion, is measured. In the measuring jig for the projector for
A first base portion having a first support surface that is perpendicular to the observation direction by the projector and is in the same direction as the observation direction and in surface contact with the planar portion of the member to be measured;
A columnar first insertion portion fixed to the first base portion and protruding from the first support surface in the same direction as the observation direction and inserted into the hollow portion of the member to be measured;
Comprising
A plane including the first support surface is set as a focal plane of the projector;
The side wall of the first insertion portion forms a first contact portion that linearly contacts the inner surface of the hollow portion in a direction along the observation direction,
Said first insert from said first contact portion so as to form a first corner of a right angle between the first contact portion with facing to and in the direction opposite to the direction of observation positions on the focusing surface Further comprising a reference plane formed toward the inside of the part,
The first base portion, said a first corner portion, and the portion opposed to said first corner portion along the focal plane of the connecting portion between the flat portion and the non-right-angled portions of the object to be measured member The first observation target region including, is configured to be observable from a direction according to the observation direction,
The first insertion portion is formed by the head portion of a screw-like member having a columnar head portion and a screw portion protruding from one end surface of the head portion along the length direction of the head portion, and the screw parts is fixed to the first base portion by being screwed to the first base portion,
A cross section of the threaded portion crossing the protruding direction of the threaded portion is inside the one end surface of the head,
The reference plane is formed by one end surface of the head;
A measuring jig for projectors.   The measuring jig for a projector according to claim 1, wherein the reference plane has a surface state substantially the same as the planar portion of the member to be measured. A dimension of a non-perpendicular portion connecting the planar portion and the inner surface of the member to be measured, which includes a planar portion and a hollow portion provided to open to the planar portion and having an inner surface perpendicular to the planar portion, is measured. In the measuring jig for the projector for
A second base portion having a second support surface that is perpendicular to the observation direction by the projector and is in the same direction as the observation direction and in surface contact with the planar portion of the member to be measured;
A second insertion part that protrudes in the same direction as the observation direction on the second support surface side of the second base part and is inserted into the hollow part of the member to be measured;
Comprising
The second insertion portion includes a second contact portion that contacts the inner surface of the hollow portion,
The second base portion is provided with an observation hole penetrating in a direction along said direction of observation along with having a perpendicular inner wall to the second supporting surface is provided so as to open to the second supporting surface,
The inner wall of the observation hole, those in the second contact portion of the inner surface of the hollow portion as well as positioned in the second contact portion includes and the observation direction parallel to the direction along the surface on the same plane Forming a reference surface facing in the same direction as the contacting part,
A plane including the reference plane is set as a focusing plane of the projector;
Perpendicular second corner portion formed by the above reference surface and the second supporting surface, said second angle along the focal plane of the connecting portion between the inner surface and the non-orthogonal portion of the hollow portion An exposed space provided in the second insertion portion so as to expose the second observation target region including the portion facing the portion to the outside through the observation hole,
The focal plane is optically opposed to the observation direction so that the second observation target region can be observed from the direction according to the observation direction provided in the exposure space through the observation hole and the exposure space. A reflector,
Further comprising
The reflecting mirror is formed integrally with the wall surface by performing a predetermined treatment on the wall surface forming the exposed space ,
The reference surface was in a surface state substantially similar to the inner surface of the hollow portion;
A measuring jig for projectors. A projector for measuring jig according to claim 1 and a second projector for measurement jig is attached, projector for measurement jig and said second projection according to the claim 1 by sliding a machine for measuring jig respective use position comprises a slide table you selectively Installation,
The second projector for measurement jig,
A dimension of a non-perpendicular portion connecting the planar portion and the inner surface of the member to be measured, which includes a planar portion and a hollow portion provided to open to the planar portion and having an inner surface perpendicular to the planar portion, is measured. a measuring jig for projectors for,
A second base portion having a second support surface that is perpendicular to the observation direction by the projector and is in the same direction as the observation direction and in surface contact with the planar portion of the member to be measured;
A second insertion part that protrudes in the same direction as the observation direction on the second support surface side of the second base part and is inserted into the hollow part of the member to be measured;
Comprising
The second insertion portion includes a second contact portion that contacts the inner surface of the hollow portion,
The second base portion includes an observation hole provided so as to open to the second support surface and having an inner wall perpendicular to the second support surface and penetrating in a direction along the observation direction,
An inner wall of the observation hole includes the second contact portion and is located on the same plane as a plane parallel to the direction along the observation direction and contacts the second contact portion of the inner surface of the hollow portion. the reference surface facing in the same direction as it has a portion in contact to form,
Plane including the reference surface is set to focus plane of the projector,
The second corner along the in-focus surface of the connecting portion between the right angled second corner formed by the reference surface and the second support surface, and the inner surface of the hollow portion and the non-right angle portion. An exposed space provided in the second insertion portion so as to expose a second observation target region including the portion facing the portion to the outside through the observation hole;
The in-focus plane is optically opposed to the observation direction so that the second observation target region can be observed from the direction according to the observation direction provided in the exposure space through the observation hole and the exposure space. A reflector,
Further comprising
The reflecting mirror is formed integrally with the wall surface by performing a predetermined treatment on the wall surface forming the exposed space.
Measuring jig for projector.

Images