JP5407029B2 - Ball shape measuring device - Google Patents

Description

  The present invention relates to a target lens shape measuring apparatus capable of measuring the shape of a band arrangement groove formed on a peripheral surface of a lens (lens shape) such as a spectacle lens or a dummy lens.

  In general, a spectacle store or the like exhibits a large number of spectacles (glasses) in which a dummy lens having no frequency is held as a spectacle lens in a spectacle frame. Such glasses include a type of glasses frame having left and right lens frames (annular rims), a type of rimless frame, and a type of grooved frame (half rim).

  For lens processing, in the case of spectacle frame type spectacles, the shape of the inner peripheral surface of the spectacle lens frame is measured with a probe to obtain the target lens shape of the dummy lens (lens shape). Is normal. Furthermore, for lens processing, for rimless frame and grooved frame type glasses, the measuring surface is moved along the peripheral surface of the dummy lens, and the peripheral surface shape of the dummy lens itself is used as the lens shape of the spectacle lens. In general, it is desired to obtain (see, for example, Patent Document 1).

  By the way, the grooved frame type glasses have a right and left eyeglass lens with grooves as a target lens shape and a half rim type eyeglass frame. The eyeglass frame includes left and right rims that respectively hold upper halves of the left and right eyeglass lenses, and a bridge that connects the left and right rims. Further, in this spectacle, a band disposition groove that opens to the peripheral surface and extends annularly in the circumferential direction is provided in the peripheral portion of the spectacle lens, and a band (string body) such as a nyroll string is disposed in the band disposition groove. In this band, the eyeglass lens is held on the rim.

JP-A-3-259710

  In the measurement of the grooved frame type glasses, only the lens shape of the dummy lens, that is, the peripheral shape of the dummy lens is obtained two-dimensionally, and the three-dimensional shape of the band-arranged groove of the dummy lens is measured. The current situation is not.

  Using such a two-dimensional target lens shape, in order to dig a band-arranged groove on the peripheral surface of the spectacle lens that is actually prescribed a refractive power with a grooving cutter, the direction in which the optical axis of the dummy lens extends It is necessary to obtain the position information of the band-arranged grooves in the three-dimensional data of the band-arranged grooves.

  For this purpose, position information at several positions on the periphery of the dummy lens in the direction in which the optical axis of the dummy lens extends is obtained, and a curve value of the dummy lens is obtained from this position information and the target lens shape.

  However, the curve value of the dummy lens is obtained from the difference between several positions of the periphery of the dummy lens in the direction in which the optical axis extends, and the value obtained from the groove curve value processed into the dummy lens based on the value is obtained as the band arrangement groove. When this is used for machining, the actual curve value is different from the groove curve value of the band arrangement groove, so that the band arrangement groove cannot be accurately processed.

Therefore, in the present invention, a contactor is directly inserted into the groove of the lens, the measurement is also performed on the groove shape of the lens, the curved three-dimensional ring shape drawn by the groove is measured, and an accurate groove curve value is obtained. The object is to provide a target lens shape measuring apparatus.

In view of this, the present invention provides a lens holder for holding a lens having a band arrangement groove formed in the circumferential direction on the circumferential surface, and abuts on the circumferential surface of the lens when measuring the peripheral shape of the lens. And a lens measuring element provided with a surface for measuring the peripheral shape of the lens as a measuring surface, and a lens surface along the peripheral surface of the lens holding the lens measuring element in the lens holder . A probe driving device that moves in a circumferential direction, a three-dimensional position detection device that detects a movement position of the lens shape measuring probe in a three-dimensional direction, and an operation control of the probe driving device for the target lens shape. The measurement surface of the probe is brought into contact with the peripheral surface of the lens and moved in the circumferential direction, and the lens periphery shape of the lens is changed based on a detection signal from the three-dimensional position detection device accompanying this movement. Calculation control obtained as target lens shape information (θi, ρi) A ball shape measuring apparatus comprising a circuit, comprising a band arrangement groove measuring element projecting from the measurement surface, and the arithmetic control circuit operates the measuring element driving device to The bottom of the band arrangement groove is made based on the detection signal from the three-dimensional position detection device by causing the tip of the arrangement groove measuring element to contact the band arrangement groove and moving in the circumferential direction of the lens. The shape in the circumferential direction is obtained as band arrangement groove shape information (θi, ρi ′) .

According to this configuration, a contact (band arrangement groove measuring element ) is directly inserted into the groove of the lens, and measurement is also performed on the groove shape of the lens, so that a curved three-dimensional ring shape drawn by the groove is obtained. Measure and obtain an accurate groove curve value.

It is a partial schematic perspective view of the target lens shape measuring apparatus according to the present invention. It is a perspective view of the target lens shape measuring apparatus according to the present invention. It is a perspective view when the target lens shape measuring apparatus of FIG. 1A is viewed from a different viewpoint. It is a side view when the target lens shape measuring apparatus of FIG. 1A is viewed from the direction of arrow C in FIG. 1A. It is a plane of the target lens shape measuring apparatus of FIG. 1A. It is a figure which shows the mechanism which swings a flame | frame holding part. It is a perspective view of the measuring mechanism of the target lens shape measuring apparatus of FIG. It is a front view of the measurement mechanism of FIG. It is a rear view of the measurement mechanism of FIG. It is a right view of the measurement mechanism of FIG. It is a schematic diagram which shows the drive means of the rotation base of the measurement mechanism of FIG. It is a schematic diagram for demonstrating the slider drive mechanism of FIG. It is a top view of Drawing 5B. It is a schematic explanatory drawing of the origin detection means of the slider of FIG. It is a perspective view which shows the raising / lowering mechanism of the measuring element of FIG. It is explanatory drawing for the measurement of the lens frame by the raising / lowering mechanism of FIG. FIG. 8 is a left side view of FIG. 7. FIG. 2 is a partially enlarged perspective view of the lens shape measuring element shown in FIG. 1. FIG. 2 is a side view of the target lens shape shown in FIG. 1. FIG. 2 is an enlarged explanatory view of a main part of the band arrangement groove measuring element shown in FIG. 1. FIG. 10 is a side view of FIG. 9. It is a control circuit diagram of the target lens shape measuring apparatus shown in FIG. It is a perspective view explaining the effect | action of the raising / lowering mechanism of the measuring element of FIG. It is explanatory drawing for the measurement of the lens frame by the raising / lowering mechanism of FIG. It is explanatory drawing of the linear scale of the raising / lowering mechanism of FIG. FIG. 14 is a right side view of FIG. 13. It is a perspective view explaining the effect | action of the raising / lowering mechanism of the measuring element of FIG. It is explanatory drawing for the measurement of the lens frame by the raising / lowering mechanism of FIG. FIG. 17 is a left side view of FIG. 16. It is a flowchart which shows the operation | movement at the time of swinging the whole slide frame. FIG. 17A specifically shows the operation of FIG. 17A, in which (a) shows a state of measuring the first target lens shape with the frame frame horizontal, and (b) shows a state of measuring the second target lens shape. FIG. FIG. 17B is a continuation of FIG. 17A, (a) is a view showing a state in which the frame is swung by a frame holding angle (α), (b) is a view showing a state in which the first target lens shape is measured, FIG. 6C is a diagram illustrating a state in which the frame is swung by a frame holding angle (−α). It is explanatory drawing of the target lens measurement by the raising / lowering mechanism of FIG. It is explanatory drawing of the target lens measurement by the raising / lowering mechanism of FIG. It is a perspective view of a grooved frame (half rim) type glasses. It is explanatory drawing which shows the relationship between the spectacle lens of FIG. 20, a rim | limb, a band, etc. It is explanatory drawing which shows the relationship between the measuring element for band arrangement | positioning grooves shown in FIG. 9B, and the shape of a band arrangement | positioning groove | channel. It is explanatory drawing which shows the relationship between the measuring element for band arrangement | positioning grooves shown to FIG. 9B, and the other shape of a band arrangement | positioning groove | channel. It is explanatory drawing which shows the relationship between the measuring element for band arrangement | positioning grooves shown to FIG. 9B, and the other shape of a band arrangement | positioning groove | channel. It is a flowchart of the shape measurement of a band arrangement | positioning groove | channel by the measuring element for band arrangement | positioning grooves. It is explanatory drawing of the measurement of the lens shape of the lens surrounding surface by the lens shape measuring element. It is explanatory drawing of the measurement of the band arrangement | positioning groove | channel of a lens by the measuring element for band arrangement | positioning grooves.

  Embodiments of the present invention will be described below with reference to the drawings.

[Constitution]
FIG. 1 shows a configuration of a main part of a target lens shape measuring apparatus according to the present invention, and the target lens shape measuring apparatus has a measuring device main body 1. The measuring apparatus main body 1 includes a lower measurement mechanism housing case 1a and a lens frame holding mechanism 1b disposed on the upper portion of the case 1a. And the base 2 shown in FIG. 2 is provided in the bottom part in case part 1a of FIG.

Further, the lens frame holding mechanism 1b of FIG. 1 includes the movable frame 400 of FIG. 1A. Further, the movable frame 400 includes a pair of parallel guide rods (guide members) 1c and 1c having opposite ends fixed to opposite side walls. Moreover, the slide frames 3 and 3 are held by the guide members 1c and 1c so as to be capable of relative approach and separation. The slide frames 3 and 3 are spring-biased in a direction approaching each other by a coil spring or the like (not shown). The slide frames 3, 3 have vertical walls 3 a, 3 a that are opposed to each other and against which a lens frame (not shown) of eyeglasses (glasses) is brought into contact, and a lens frame holding unit that holds the lens frame 3b. The lens frame holding means 3b includes a lower holding rod (fixed holding rod) 3b1 protruding from the vertical wall 3a and an upper holding rod (attached to the slide frame 3 that can be opened and closed with respect to the holding rod 3b1 from above. (Movable holding rod) 3b2. The lens frame holding means 3b is provided for the left and right lens frames of glasses (not shown). As such a lens frame holding mechanism 1b, for example, a configuration disclosed in Japanese Patent Application Laid-Open No. 10-328992 or other known techniques can be employed. Therefore, detailed description of the lens frame holding mechanism 1b is omitted.
<Measuring mechanism>
FIG. 1A is a perspective view of the target lens shape measuring apparatus according to the present invention, and FIG. 1B is a perspective view of the target lens shape measuring apparatus of FIG. 1C is a side view of the target lens shape measuring apparatus of FIG. 1A viewed from the direction of arrow C, and FIG. 1D is a top view of the target lens shape measuring apparatus of FIG. 1A. 1A to 1D are schematically shown by omitting a part of the shape of the slide frames 3 and 3 in FIG. 1 for convenience of description of the configuration.

  As shown in FIGS. 1A to 1C, the movable frame 400 (swinging frame, swing frame) has opposite side walls and a bottom surface, and the bottom surface is formed in a polygonal convex shape. An opening 400 </ b> A is formed at the center of the bottom surface of the movable frame 400. The opening 400A is for the lens frame probe 37 and the mounting hole probe 38 to be inserted upward from below. The lens frame probe 37 and the mounting hole probe 38 will be described later.

  The movable frame 400 may be a cylindrical surface convex downward. Further, guide rails 403 that are belt-like and bent in an arc shape around the virtual axis 402 are attached to the outer end surfaces 401 of both slide frames 3.

  On the other hand, the case portion 1a of the measurement apparatus main body 1 in FIG. 1 has the lower case 404 in FIG. 1A. Brackets 405 and 405 are integrally provided upward on both sides of the upper wall of the lower case 404. A probe insertion hole (not shown) is formed on the upper wall of the lower case 404. The measuring element insertion hole is formed to have the same size as or larger than the opening 400A. Each bracket 405 is provided with a support roller 406 at an upper portion thereof and a support roller 407 below the support roller 406 so as to be rotatable. The support rollers 406 and 407 of each bracket 405 are arranged so as to sandwich the guide rail 403 of the slide frame 3 vertically. That is, both the slide frames 3 are supported on the lower case 404 of the measuring apparatus main body 1 by the guide rails 403 being sandwiched between the upper and lower support rollers 406 and 407. It is possible to swing in the direction of arrow D around the virtual axis 402.

  A belt 408 is provided on the lower edge of the guide rail 403 as shown in FIG. 1E. Both ends of the belt 408 are fixed to the lower edge of the guide rail 403, and portions other than the both ends are not fixed to the lower edge of the guide rail 403. That is, the belt 408 can be separated from the lower edge of the guide rail 403 at portions other than both ends thereof.

  A motor 409 (see FIGS. 1A to 1D) is provided as a drive unit on the lower case 404 of the measurement apparatus main body 1, and a drive roller 410 is attached to the output shaft of the motor 409. The drive roller 410 is disposed at a position approximately in the middle between the support rollers 407 and 407 attached to the brackets 405 and 405 on both sides of the drive roller 410 and below the support rollers 407 and 407, respectively.

  The belt 408 provided on the lower edge of the guide rail 403 is wound around one support roller 407, wound around the drive roller 410, and further wound around the other support roller 407. . The belt 408 has a jagged upper surface (a surface that contacts the lower edge of the guide rail 403), and a jagged outer peripheral surface of the drive roller 410. As a result, the friction coefficient between the upper surface of the belt 408 and the outer peripheral surface of the driving roller 410 is large, and when the driving roller 410 rotates, the belt 408 does not slip and moves rightward or leftward in FIG. 1E. As a result, the slide frame 3 can be swung in the direction of arrow D (see FIGS. 1A and 1C) about the virtual axis 402. Although not shown in the figure, the measuring apparatus main body 1 is provided with a swing angle detection unit for detecting an angle (swing angle) when the slide frame 3 swings.

  The guide rail 403, the support rollers 406 and 407, the belt 408, the motor 409, and the drive roller 410 constitute a holding means swing mechanism.

  A measuring mechanism 1d as shown in FIGS. 2 to 5 is provided on the base 2. Although not shown in FIG. 1A, the measurement mechanism 1 d is disposed in the lower case 404 of FIG. 1A and has a base support member 4 fixed on the base 2. A large-diameter driven gear 5 is attached to the base support member 4 so as to be horizontally rotatable about a vertical axis. A drive motor 6 schematically shown in FIG. 5A is attached to the base 2 adjacent to the driven gear (timing gear) 5. A pinion (timing gear) 7 is fixed to the output shaft 6 a of the drive motor 6, and a timing belt 8 is stretched between the pinion 7 and the driven gear 5.

  When the drive motor 6 is operated, the rotation of the output shaft 6a of the drive motor 6 is transmitted to the driven gear 5 via the pinion 7 and the timing belt 8 so that the driven gear 5 is rotated. The drive motor 6 is a two-phase stepping motor.

  As shown in FIGS. 2 to 5, the rotation base 9 is integrally fixed on the driven gear 5. A photosensor 9 a as an origin detection device (origin detection means) is attached to the rotation base 9. In this case, for example, a light emitting means 9b for instructing the origin position is disposed on the base 2, and a linear or dotted light beam is irradiated upward as an origin mark from the light emitting means 9b. When the photosensor 9a detects the light beam as the origin mark, the origin position for the horizontal rotation of the rotary base 9 can be set.

  As the origin detection device, a known technique such as a transmissive photosensor, a reflective photosensor, or a proximity sensor can be employed.

  Further, as shown in FIGS. 2 to 4, parallel rail mounting plates 10 and 11 that extend vertically and face each other are integrally fixed to both ends in the longitudinal direction of the rotary base 9, as shown in FIG. As shown in FIG. 4, the longitudinal end of the side plate 12 is fixed to one side of the rail mounting plate 10 and one side of the rail mounting plate 11, respectively. The end portions of the side plates 13 in the longitudinal direction are fixed to the other side portions of the mounting plate 11.

  Also, as shown in FIGS. 2 to 4, a pair of parallel and axial guide rails 14, 14 are horizontally disposed between the upper portions of the opposing rail mounting plates 10, 11. Both end portions of each guide rail 14 are fixed to rail mounting plates 10 and 11, and a slider 15 is held on the guide rails 14 and 14 so as to be movable back and forth in the longitudinal direction.

  Further, as shown in FIGS. 2 and 3, the side plate 12 is integrally formed with a pulley support plate portion 12 a that is bent sideways so as to be close to the rail mounting plate 10 and protrude horizontally. A bracket 16 for motor mounting is fixed in close proximity to the rail mounting plate 11.

  A driven pulley 17 is attached to the pulley support plate portion 12a so as to be horizontally rotatable about an axis extending vertically, and an upper end portion of a drive motor 18 for moving the slider is fixed to the bracket 16. The drive motor 18 is a DC motor. Further, the axis of the output shaft 18a is directed up and down in the drive motor 18, and a drive pulley 19 is attached to the output shaft 18a as shown in FIGS. 5B and 5C.

  An annular wire 20 is stretched over the pulleys 17 and 19, and a portion near one end of the wire 20 is held by a shaft-like wire holding member 21. The wire holding member 21 is fixed to the slider 15 via brackets 22 and 22 '. Further, both ends of the wire 20 are connected via a coil spring 23. Thereby, when the drive motor 18 is rotated forward or backward, the output shaft 18a and the drive pulley 19 are rotated forward or backward, and the slider 15 is moved to the left or right in FIG.

  Further, as shown in FIG. 5D, an origin sensor (origin detection means) 20a for detecting the origin of the movement position (movement amount) of the slider 15 is interposed between the bracket 22 ′ and the side plate 12. ing. A reflection type sensor is used as the origin sensor 20a. This sensor includes a reflection plate 20b provided with a slit-like reflection surface (not shown) extending vertically, and a reflection type photosensor 20c including a light emitting element and a light receiving element. The reflecting plate 20b is provided on the bracket 22 ', and the photosensor 20c is provided on the side plate 12.

  As the origin sensor 20a, a known technique such as a transmissive photosensor or a proximity sensor can be employed.

  Further, a support plate portion 13a that protrudes horizontally to the side as shown in FIG. 4 is integrally formed at the central portion in the longitudinal direction of the side plate 13 of FIG. As shown in FIG. 4, a linear scale (position measuring means) 24 for detecting the horizontal movement position of the slider 15 in the direction in which the guide rail 14 extends is provided between the side plate 13 and the slider 15. It is interposed as a detection sensor (radial radius detection means).

  The linear scale 24 includes a shaft-shaped main scale 25 that is held by a slider 15 in parallel with the guide rail 14 and a detection head 26 that is fixed to the support plate 13a and reads position information of the main scale 25. The detection head 26 detects the movement position of the slider 15 in the horizontal direction from the position detection information (movement amount detection information) of the main scale 25. As the linear scale 24, for example, a known magnetic type or optical type can be used.

  For example, in the case of the magnetic type, magnetic patterns of the magnetic poles S and N are alternately provided on the main scale 25 as position detection information (movement amount detection information) in the axial direction, and this magnetic pattern is detected by the detection head. By detecting with the (magnetic change detection head) 26, the moving amount (moving position) of the slider 15 can be detected. Further, in the case of the optical type, the main scale 25 is formed in a plate shape, slits with a minute interval are provided in the main scale 25 in the longitudinal direction, the light emitting element and the light receiving element are disposed so as to sandwich the main scale 25, and The amount of movement (movement position) of the slider 15 can be detected by detecting the light from the light emitting element by the light receiving element through the slit of the main scale 25 and obtaining the number of slits.

  Further, as shown in FIG. 2, a through hole 15a is formed in a substantially central portion of the slider 15, and a guide cylinder 27 extending vertically is inserted into the through hole 15a. A support frame 28 is disposed below the slider 15 as shown in FIG. The support frame 28 includes vertical frames 29 and 30 whose upper ends are held by the slider 15, and horizontal plates (bottom plates) 31 fixed to the lower ends of the vertical frames 29 and 30.

  Fixed to the horizontal plate (bottom plate) 31 are lower ends of a pair of shaft-like support members 32, 32 extending vertically and parallel to each other (see FIG. 8). A holding member (connecting member) 33 is fixed to the upper end portions of the support members 32, 32, and a vertical wall 34 a of a guide support member 34 whose side surface shape is formed in an L shape is fixed to the holding member 33. . On the lateral wall (upper wall) 34b of the guide support member 34, the lower end portion of the guide tube 27 is fixed.

  The guide cylinder 27 is fitted and held with a probe shaft 35 extending vertically so as to freely move up and down, and an upper end of the measurement shaft 35 is integrally provided with a lens shape measuring element (lens shape measuring element) 36. Is provided. In this lens shape measuring element 36, an attaching part 36a attached perpendicularly to the upper end part of the measuring element shaft 35 and a vertical part 36b extending upward from the attaching part 36a are formed in an L shape. Further, the back surface 36c of the vertical portion 36b is processed at a constant R for measuring the peripheral shape of the target lens shape. A lens frame measuring element 37 is integrally provided at the upper end of the vertical portion 36b in parallel with the mounting portion 36a. The lens frame probe 37 is attached to the front surface 36d opposite to the back surface 36c of the vertical portion 36b.

  Further, the glasses (glasses) M include a grooved frame type (half rim type). As shown in FIG. 20, the grooved frame type spectacles M have the right and left spectacle lenses ML and MR with grooves as the target lens shape Lm, and the half rim type spectacle frame MF. The spectacle frame MF includes rims Lrm and Rrm that hold the upper half of the spectacle lenses ML and MR, and a bridge B that couples the rims Lrm and Rrm.

Further, in the glasses M, as shown in FIG. 21, a band disposition groove (dummy lens groove that is a wire frame groove) Lg that opens to the peripheral surface and extends annularly in the circumferential direction is provided on the peripheral portion of the spectacle lens. A band (suspending band, ie, a suspended string-like body) Bd such as a nyroll string is disposed in the band disposition groove Lg, and the spectacle lenses ML and MR are held on the rim Lrm (Rrm) by the band Bd. . This type of glasses M includes those that use a spectacle lens that has a power to correct the eye refractive power of the wearer and those that are exhibited at a spectacle store or the like for selecting glasses. In the glasses exhibited at a spectacle store or the like, a dummy lens having no power is used as a spectacle lens.

  The three-dimensional lens shape (lens shape) of the band arrangement groove Lg of the spectacle lenses ML and MR is necessary for precise processing of the band arrangement groove Lg. However, as the cross-sectional shape of the band disposition groove Lg of such glasses M, it is a rectangular groove shape (square base) as shown in FIG. 22, or toward the lens peripheral surface as shown in FIG. There are a widening taper groove shape that expands and a round bottom shape, or a dovetail shape (inverted triangular shape) with a narrower interval toward the lens peripheral surface as shown in FIG.

  Since the band arrangement groove Lg of the glasses M having various cross-sectional shapes has a small opening end width to the lens peripheral surface, the measurement of measuring the lens shape (lens shape information) of the band arrangement groove Lg. The child needs to have a small diameter. Moreover, even if the diameter is small, it is necessary to sufficiently maintain the strength of the measuring element.

  As shown in FIG. 9A, a band arrangement groove measuring element 36e that satisfies such a condition is provided at the upper end of the vertical portion 36b. That is, a pin-shaped band arrangement groove measuring element 36e extending in the direction opposite to the lens frame measuring element 37 from the back surface 36c side is attached to the upper end of the vertical part 36b.

  As shown in FIG. 9B, the band arrangement groove measuring element 36e includes a tapered pin portion 36f formed in a tapered shape (tapered shape) from the attachment base end to the vertical portion 36b toward the distal end, and a tapered pin portion 36f. Further, a taper-shaped (tapered or conical) abutting portion 36g is provided continuously at the tip of the head. The contact portion 36g is formed with a taper angle larger than the taper angle of the taper pin portion 36f and is formed with a short length, and a minute spherical portion (detailed illustration is omitted in the figure) at the tip. Have. Moreover, the spherical portion (not shown) is formed with a radius smaller than the radius of the spherical bottom surface even if the band disposition groove Lg has a spherical bottom surface, and is brought into contact with the spherical bottom surface with a point. It is supposed to be.

  Thus, the strength of the taper pin portion 36f is maintained by increasing the diameter of the base end side of the attachment to the vertical portion 36b. Further, the tapered pin portion 36f is tapered, so that the tapered pin portion 36f can be inserted into the band disposition groove Lg having various cross-sectional shapes. Moreover, by providing a tapered (conical or conical) contact portion 36g at the tip of the taper pin portion 36f, the band arrangement groove measuring element 36e is inserted into the band arrangement groove Lg having various cross-sectional shapes. It is easy.

  In this embodiment, the base end dimension t1 of the taper pin portion 36f is set to 1.0 mm, and the tip end dimension (tip end diameter) t2 of the taper pin portion 36f is set to 0.5 to 0.9 mm. The length of the abutting portion 36g is set to a dimension corresponding to the tip dimension (tip diameter) t2 such that the side surface shape is a substantially equilateral triangle.

  Moreover, as shown in FIG. 10, a mounting hole measuring element 38 protruding upward is integrally provided at the upper end of the target lens measuring element 36. The mounting hole probe 38 includes a shaft 38a that is integrally attached to the upper end of the vertical portion 36b of the target lens 36 parallel to the axis of the probe shaft 35, and a hemisphere provided at the upper end of the shaft 38a. 38b. Since the hemisphere 38b corresponds to various mounting hole diameters, a hemispherical shape larger than a general mounting hole diameter (2.2φ) is desirable. Further, the mounting hole probe 38 need not be integral with the target lens probe 36 as described above. For example, as shown in FIG. 9, a threaded portion 36s is provided in a lens shape measuring element 36, and this threaded part 36s is screwed to the upper end portion of the vertical part 36b, whereby the mounting hole measuring element 38 is connected to the vertical part 36b. You may make it attach to the upper end part of detachable.

  Further, as shown in FIGS. 6 to 8, a bracket 39 is fixed to the lower end portion of the tracing stylus shaft 35. Moreover, as shown in FIG. 13, a linear scale (position measuring means) 40 for detecting the vertical movement position is provided between the bracket 39 and the guide support member 34. The height detecting sensor (height detecting means). It is intervened as.

  The linear scale 40 includes a shaft-like main scale 41 disposed in parallel with the measuring element shaft 35 in the vertical direction, and the amount of movement of the main scale 41 in the vertical direction from the vertical direction of the measuring elements 37 and 38. A detection head 42 for detecting the movement position is provided. The main scale 41 has an upper end fixed to the holding member 33 and a lower end fixed (or held) to the bracket 39. The detection head 42 is held by the holding member 33. The linear scale 40 is also of the same magnetic or optical type as the linear scale 24 described above.

  As shown in FIGS. 6 to 8, a coil spring 43 is interposed between the bracket 39 and the lateral plate (bottom plate) 31 to bias the tracing stylus shaft 35 upward. Further, an engaging shaft 44 that is positioned above the bracket 39 and orthogonal to the measuring member shaft 35 is attached in the vicinity of the lower end portion of the measuring member shaft 35. Also, a bracket 45 formed in a U shape as shown in FIG. 6 is fixed on the horizontal plate (bottom plate) 31, and both end portions of the support shaft 46 are around the axis on the opposing walls 45 a and 45 a of the bracket 45. The holding shaft 47 is fixed to the support shaft 46. The pressing lever 47 is in contact with the upper part of the engagement shaft 44. In addition, a tension coil spring 48 for lowering the lever is interposed between the pressing lever 47 and the lateral plate 31. The tension spring force of the tension coil spring 48 is set larger than the spring force of the coil spring 43.

  Further, a rising position regulating lever 49 is fixed to the support shaft 46. The ascending position restricting lever 49 restricts the ascending position of the engaging shaft 44 by the pressing lever 47, and the measuring element shaft 35, the lens shape measuring element 36, the band arrangement groove measuring element 36e, and the lens frame measuring element. 37, used to set the rising position of the mounting hole probe 38 and the like. The raised position regulating lever 49 extends in the same direction as the pressing lever 47.

An actuator motor 50 is disposed below the raised position regulating lever 49. The actuator motor 50 includes a motor main body 50 a fixed on the horizontal plate 31, and a shaft 51 that protrudes upward from the motor main body 50 a and whose axis is provided in parallel with the measuring element shaft 35. A lift position regulating lever 49 is brought into contact with the upper end of the shaft 51 by the tension spring force of the tension coil spring 48. A pulse motor is used as the actuator motor 50. Moreover, the actuator motor 50 is configured such that the shaft 51 advances upward when rotated forward and the shaft 51 moves downward when rotated reversely.

Note that the coil spring 43, the support shaft 46, the holding lever 47, the tension coil spring 48, the lift position regulating lever 49, the actuator motor 50, etc. are the measuring elements 37, 38, etc. (Child) lifting mechanism.
<Control circuit>
10A, the origin detection signal from the above-described photosensor (origin detection means) 9a, the origin detection signal from the photosensor (origin detection means) 20c, and the amount of movement of the linear scale 24 from the detection head 26. A detection signal (position detection signal), a movement amount detection signal (position detection signal) from the detection head 42 of the linear scale 40, and the like are input to an arithmetic control circuit (control circuit) 52. The arithmetic control circuit (control means) 52 drives the drive motors 6 and 18 and the actuator motor 50 via the motor drive circuits Pd1, Pd2 and Pd3.

  The drive motors 6 and 18, the actuator motor 50, and the like constitute a probe driving device (three-dimensional drive device) D. The linear scale 24, the linear scale 40, the motor drive circuit Pd1 of the drive motor 6 and the like constitute a three-dimensional position detection device.

  Further, as shown in FIG. 1, holder detection means 53 for detecting a target holder (not shown) is provided on one side wall of the slide frames 3 and 3. For the holder detection means 53, a micro switch or the like is used. The detection signal from the holder detection means 53 is input to the arithmetic control circuit 52 as shown in FIG. 10A. In the figure, 54 is a start switch for starting measurement. Reference numeral 55 denotes a memory connected to the arithmetic control circuit 52.

  Further, the arithmetic control circuit 52 is connected with a liquid crystal display 56 as a display device (display means) for displaying a measurement state, a message, or a display for making a selection necessary for the measurement.

  Further, the arithmetic control circuit 52 executes a grooved switch 57 for measuring the target lens shape of the target lens Lm having the band-arranged groove, and the target lens Lml lens shape without the band-arranged groove. A grooveless switch 58 is connected for the purpose.

Then, when the holder detecting means 53 detects the target holder (not shown), the arithmetic control circuit 52 determines whether or not the target lens held by the target holder (not shown) has a groove on the liquid crystal display 56. A message prompting you to select is displayed. In addition, when the arithmetic control circuit 52 selects and pushes either one of the switches 57 and 58 in accordance with this message, whether or not the target lens held by the target lens holder (not shown) has a band arrangement groove. Judgment is made.
[Action]
Hereinafter, the operation of such a target lens shape measuring apparatus will be described.

(I) Measurement of lens frame shape and basic operation of measurement mechanism Before measuring the shape of a lens frame of glasses or measuring the shape of a lens such as a demo lens with this target lens shape measuring device, the shaft of the actuator motor 50 The upper end of 51 is located at the lowest end (bottom dead center) as shown in FIGS. At this position, the holding lever 47 is urged to rotate downward about the support shaft 46 by a tension coil spring 48 having a stronger spring force than the coil spring 43. As a result, the holding lever 47 pushes down the tracing stylus shaft 35 via the engagement shaft 44. Thereby, the lens frame measuring element 37 and the target lens shape measuring element 36 are positioned at the lowermost end.

  When measuring the shape of the lens frame of the glasses with the target lens shape measuring apparatus in this state, for example, as in Japanese Patent Laid-Open No. 10-328992, the glasses frame MF having the left and right lens frames LF (RF) in FIG. Is disposed between the slide frames 3 and 3 in FIG. 1 (illustration of the eyeglass frame MF is omitted in FIG. 1), and the lens frame LF (RF) is sandwiched between the holding rods 3b1 and 3b2 as shown in FIG. This holding is the same as that of JP-A-10-328992.

  Further, as shown in FIG. 7, the lens frame LF (RF) held between the holding rods 3b1 and 3b2 is set to be positioned above the lens frame measuring element 37 before the measurement is started. ing. That is, the lens frame probe 37 is positioned at the initial position (A) below the lens frame LF (RF). Moreover, as shown in FIG. 7, the lens frame probe 37 and the mounting hole probe 38 are positioned at the initial position (i) at the approximate center of the lens frame LF (RF) held between the holding rods 3b1 and 3b2. Is positioned so as to correspond to

  At this position, the photo sensor 9a detects the origin of horizontal rotation of the rotary base 9 from the light flux from the light emitting means 9b, and the origin sensor 20a detects the origin of the moving position of the slider 15.

  Even if the lens frame is curved in the three-dimensional direction, the holding portions of the lens frame by the holding rods 3b1 and 3b2 are set to the lowest height than the other portions. In this holding portion, the height of the bevel groove Ym of the lens frame LF (RF) is also set, and becomes the lens frame shape measurement start position Bs.

  When the start switch 54 in FIG. 10A is turned on from this state, the arithmetic control circuit 52 causes the actuator motor 50 to rotate forward so that the shaft 51 is moved upward from the position in FIGS. 6 to 8 to the position in FIGS. Advance (increase) by a fixed amount. At this time, the shaft 51 pulls the free end portion of the ascending position restricting lever 49 upward by a predetermined amount against the spring force of the coil spring 48 to rotate the ascending position restricting lever 49 integrally with the support shaft 46. .

  Along with this, the holding lever 47 rotates integrally with the support shaft 46, and the free end is raised upward by a predetermined amount. As the free end of the holding lever 47 is raised, the engagement shaft 44 is raised following the free end of the holding lever 47 by the spring force of the coil spring 43, and the measuring element shaft 35 is raised by a predetermined amount.

  The amount of rise of the probe shaft 35, that is, the amount of advancement (rise) of the shaft 51 by the actuator motor 50 is such that the tip of the lens frame probe 37 starts from the initial position (A) in FIG. The amount L increases to the height (b) facing the bevel groove Ym at the position Bs.

  Then, the arithmetic control circuit 52 drives and controls the drive motor 18 to rotate the drive pulley 19, and moves the slider 15 along the guide rail 14 by the wire 20 of FIGS. At this time, the slider 15 is moved in the direction of arrow A1 in FIG. This movement is performed until the tip of the lens frame probe 37 is brought into contact with the bevel groove Ym as shown in FIG. 12 at the shape measurement start position Bs. Moreover, in the state where the tip of the lens frame probe 37 is in contact with the bevel groove Ym, the lens frame probe 37 is elastically brought into contact with the bevel groove Ym by the spring force of the coil spring 23. In this state, the drive motor 18 is stopped.

  Note that when the tip of the lens frame probe 37 abuts against the bevel groove Ym, the load applied to the drive motor 18 increases and the current flowing through the drive motor 18 increases. By detecting this change in current, The drive motor 18 can be stopped by detecting that the tip of the lens frame probe 37 has come into contact with the bevel groove Ym.

  Thereafter, the arithmetic control circuit 52 further rotates the actuator motor 50 in the forward direction to advance (raise) the shaft 51 upward from the position shown in FIGS. 11 to 14 to the position shown in FIGS. At this time, the shaft 51 pulls the free end portion of the ascending position restricting lever 49 upward by a predetermined amount against the spring force of the coil spring 48 to rotate the ascending position restricting lever 49 integrally with the support shaft 46. .

  Along with this, the holding lever 47 rotates integrally with the support shaft 46, the free end portion is raised upward by a predetermined amount, and the free end portion of the holding lever 47 is separated from the engaging shaft 44 by a predetermined amount. Accordingly, the tracing stylus shaft 35 can be moved up and down.

  Next, the arithmetic control circuit 52 controls the drive motor 6 to rotate the drive motor 6 in the normal direction. The rotation of the drive motor 6 is transmitted to the driven gear 5 through the pinion 7 and the timing belt 8, and the driven gear 5 is horizontally rotated integrally with the rotation base 9 (see FIG. 5A).

  As the rotary base 9 rotates, the slider 15 and a number of components provided on the slider 15 rotate horizontally integrally with the rotary base 9, and the tip of the lens frame probe 37 slides along the bevel groove Ym. Moving. At this time, since the slider 15 moves along the guide rail 14 integrally with the lens frame measuring element 37, the movement amount when the slider 15 moves from the origin position of the slider 15 is the amount of movement of the lens frame measuring element 37. It becomes the same as the amount of movement of the tip. This amount of movement is obtained by the arithmetic control circuit 52 from the detection signal of the detection head 26 of the linear scale 24.

  Moreover, since the dimension (length) from the center of the probe shaft 35 to the tip of the lens frame probe 37 is known, the lens frame probe from the rotation center of the rotary base 9 when the slider 15 is at the origin. If the distance to the tip of 37 is set in advance, when the slider 15 moves along the guide rail 14, the distance from the center of rotation of the rotary base 9 to the tip of the lens frame probe 37 changes. However, this change in distance can be made the radius ρi.

  Therefore, the bevel groove of the lens frame LF (RF) is obtained by obtaining the rotation angle θi of the rotation base 9 by the rotation of the drive motor 6 from the number of drive pulses of the drive motor 6 and obtaining the moving radius ρi corresponding to this rotation angle θi. The shape of Ym in the circumferential direction (lens frame shape) can be obtained as lens frame shape information (θi, ρi) in polar coordinate format.

  In addition, when the tip of the lens frame probe 37 is slidably moved along the bevel groove Ym, if the lens frame LF (RF) has a vertical curve, this vertical curve is determined by the linear scale 40. The amount of displacement in the vertical direction is obtained from the detection signal of the detection head 42 by the arithmetic control circuit 52. The amount of displacement in the vertical direction is the vertical position Zi.

  Therefore, the lens frame shape of the lens frame LF (RF) is obtained by the arithmetic control circuit 52 as three-dimensional lens frame shape information (θi, ρi, Zi). The obtained three-dimensional lens frame shape information (θi, ρi, Zi) is stored in the memory 55 by the arithmetic control circuit 52.

  In the present embodiment, when measuring the lens frame shape, the motor 409 is rotated forward and backward to move the belt 408 wound around the drive roller 410 in the right direction and the left direction as shown in FIG. 1E. As a result, the entire slide frame 3 can be swung in the direction of arrow D about the virtual axis 402.

  As a result, for example, a high curve frame of plus 8 curves or more (possible up to plus 12 curves) is automatically tilted, and the bottom of the bevel groove can be measured without removing the feeler from the bevel groove of the frame frame. The frame PD can also be accurately measured.

  Also, by swinging the entire slide frame 3 around a virtual axis close to the center of curvature of the curve of the frame frame, the frame frame like a plus 8 curve can be held horizontally, and the contact is made into a bevel groove. It is possible to accurately engage and measure an accurate frame (lens frame) shape.

  FIG. 17A is a flowchart showing an operation when the entire slide frame 3 is swung in the direction of arrow D. FIGS. 17B and 17C are diagrams for specifically explaining the operation of FIG. 17A.

  In FIG. 17A, first, an arithmetic control circuit 52 (see FIG. 10A) as a control means controls a holding means swing mechanism comprising a guide rail 403, support rollers 406 and 407, a belt 408, a motor 409, a drive roller 410, and the like. Then, the slide frame 3 holding the frame frame is set in a horizontal state (see FIG. 17B (a)), and the shape of the first target lens shape of the frame frame is measured (step S11).

  Then, it is determined whether or not the warp amount Wp of the frame frame exceeds a certain value (step S12). If the warp amount Wp of the frame frame does not exceed a certain value, the arithmetic and control circuit 52 measures the shape of the second target lens shape of the frame frame while keeping the slide frame 3 in a horizontal state (step S13: FIG. 17B (b)).

  When the frame frame warp amount Wp exceeds a certain value, the arithmetic control circuit 52 controls the holding means swing mechanism to swing the slide frame 3 in one direction (step S14: FIG. 17C (a)). reference). This swing angle is set to an amount that can cancel the warp amount Wp of the frame (this is referred to as a frame holding angle (α)). Then, the shape measurement of the first target lens shape is performed again in the swung state (see step S15: FIG. 17C (b)). The swing angle, which is the measurement result at this time, is stored in the memory 55 (see FIG. 10A).

  Next, in order to measure the shape of the second target lens shape of the frame frame, the arithmetic control circuit 52 controls the holding means swing mechanism to swing the slide frame 3 in a direction opposite to the one direction. (Step S16: See FIG. 17C (c)). At this time, the arithmetic control circuit 52 swings the slide frame 3 based on the swing angle stored in the memory 55. That is, the arithmetic control circuit 52 swings the slide frame 3 by the frame holding angle (−α) in order to bring the second target lens into a horizontal state. In this state, the shape of the second target lens is measured (step S13).

As described above, the frame holding angle (α) is stored in the memory 55, and based on the storage result, the slide frame 3 is swung by the frame holding angle (−α), whereby the first target lens shape and the second target lens shape are obtained. It is possible to measure the frame shape with the target lens shape substantially horizontal. Further, since the angle change between the stylus and the bevel groove can be reduced, the measurement error can be further reduced.
(II) Measuring the shape of target lenses such as eyeglass lenses and demo lenses
(II-a) Measurement of peripheral shape of normal target lens
(i) Set of eyeglasses such as spectacle lenses and demo lenses As described above, the spectacles (glasses) M include a grooved frame type (half rim type). As shown in FIG. 20, the eyeglasses M includes the right and left eyeglass lenses ML and MR with grooves as the target lens shape Lm, and the half rim type eyeglass frame MF. The spectacle frame MF includes rims Lrm and Rrm that hold upper half of the left and right spectacle lenses ML and MR, and a bridge B that couples the rims Lrm and Rrm. In this type of glasses M, as shown in FIG. 21, a band arrangement groove Lg that opens to the peripheral surface and extends annularly in the circumferential direction is provided at the peripheral edge of the eyeglass lens ML (MR). A band (string-like body) B such as a nyroll string is disposed on the rim Lrm (Rrm) so that the spectacle lens ML (MR) is held by the band Bd. This type of glasses M includes those that use a spectacle lens that has a power to correct the eye refractive power of the wearer and those that are exhibited at a spectacle store or the like for selecting glasses. In the glasses exhibited at a spectacle store or the like, a dummy lens having no power is used as a spectacle lens.

  In the case of measuring the shape of the band arrangement groove of the target lens Lm such as an actual spectacle lens or dummy lens, for example, a well-known technique disclosed in Japanese Patent Laid-Open Nos. 10-328992 and 8-294855 is known. A target holder can be used. In order to hold a target lens such as a demo lens in the target holder of Japanese Patent Laid-Open No. 10-328992, a suction disk and a suction disk holding structure as disclosed in Japanese Patent Laid-Open No. 8-294855 can be employed. Since the structure of the target holder is not the essence of the present invention, the detailed description thereof is omitted.

  A lens holder such as a demo lens is held by the above-described lens holder, and the lens holder is disposed between the slide frames 3 and 3, and the side wall of the lens holder disclosed in Japanese Patent Laid-Open No. 10-328992 or Japanese Patent Laid-Open No. 8-294855. The side flange of the publication is held between a holding bar (fixed holding bar) 3b1 and a holding bar (movable holding bar) 3b2. At this time, the target lens shape held by the target lens holder is directed downward.

  When the target holder (not shown) is detected by the holder detection means 53, this detection signal is input to the arithmetic control circuit 52. At this time, when the holder detecting means 53 detects the target holder (not shown), the arithmetic control circuit 52 determines whether the target lens held by the target holder (not shown) has a groove on the liquid crystal display 56. Display a message prompting you to select no.

  In connection with this, the case where the measurement of the target lens shape of target lens Lm which has a band arrangement | positioning groove | channel is performed is demonstrated based on the flowchart of FIG. In this case, the grooved switch 57 is pressed, and the grooveless switch 58 is pressed in order to execute the measurement of the l lens shape of the target lens Lm without the band arrangement groove.

  Then, when one of the switches 57 and 58 is pressed, the arithmetic control circuit 52 determines whether or not the target lens shape held in the target lens holder (not shown) has a band arrangement groove in step S1. To do. In addition, when the switch 57 is pressed, the arithmetic control circuit 52 determines that the target lens has a groove and proceeds to step S2. When the switch 58 is pressed, the arithmetic control circuit 52 determines that the target lens has no groove and proceeds to step S8. To do.

In step S2 and step S8, the contact operation of the target lens shape 36 with the target lens shape Lm and the peripheral shape measurement of the target lens shape are executed.
(ii) Contact operation of the lens shape measuring element 36 to the lens shape
(a) Contact operation 1
In step S2 and step S3, the arithmetic control circuit 52 moves the slider 15 forward from the origin position along the guide rail 14, and the target lens shape 36 is held in a target lens holder (not shown). The measurement operation of the lens shape of the target lens shape Lm and the band arrangement groove shape is started.

  Next, the arithmetic control circuit 52 rotates the actuator motor 50 in the forward direction as described above to raise the lens frame probe 37 from the initial position (A) in FIG. 7 to the height (B). Along with this, the lens shape measuring element 36 also rises integrally with the lens frame measuring element 37 and rises to a height corresponding to the periphery of the lens shape held by the lens shape holder (not shown).

Thereafter, the arithmetic control circuit 52, a driving motor 18 controls and drives the rotation of the driving motor 18 is transmitted to the slider 15 by the wire 20, provided in the lens shape measuring element 36 as shown in FIG. 18 vertical The slider 15 is moved and controlled along the guide rail 14 so that the back surface (measurement surface) 36c of the part 36b moves until it abuts on the peripheral surface of the target lens shape Lm held by the target lens shape holder (not shown). Then, as shown in FIG. 18, the back surface (measurement surface) 36 c of the vertical portion 36 b provided on the lens shape measuring element 36 is brought into contact with the peripheral surface of the lens shape Lm.

When the back surface (measurement surface) 36c of the vertical portion 36b provided on the lens shape measuring element 36 in this way is brought into contact with the peripheral surface of the lens shape Lm, the lens shape measuring element 36 is shown in FIG. The moving distance from the geometric center Go of the target lens shape Lm to the position X1 brought into contact with the circumferential surface is the moving radius ρi.

Such control can be performed based on standard target lens shape data obtained in advance through experiments or the like.
(b) Contact operation 2 (other contact operation)
Note that other methods may be used as a procedure for bringing the lens shape measuring element 36 into contact with the peripheral surface of the lens shape Lm. That is, first, the actuator motor 50 is rotated forward, and the free end portion of the rising position regulating lever 49 is lifted upward from the position of FIG. 7 to the position of FIGS. 15 to 17 against the spring force of the tension coil spring 48. The support shaft 46 is rotated. At this time, the support shaft 46 rotates the pressing lever 47 to raise the free end portion of the pressing lever 47 in the same direction as the free end portion of the rising position regulating lever 49. Along with this, the engaging shaft 44 is raised integrally with the tracing stylus shaft 35 by the spring force of the coil spring 43, and the target stylus 36 is raised, so that it contacts the rear refracting surface fb of the lenticular Lm. Touched. Thereafter, the drive motor 18 is driven and controlled, the slider 15 is moved along the guide rail 14 at a predetermined speed, and the target lens 36 is moved to the peripheral edge side along the rear refractive surface fb of the target lens Lm. The target 36 for moving the target lens shape is moved to a position far from the periphery of the rear refractive surface of the target lens shape Lm. At this time, even if the lens shape measuring element 36 is detached from the periphery of the rear refractive surface fb of the lens shape Lm and is lifted integrally with the lens frame measuring element 37 by the spring force of the coil spring 43, the spring of the coil spring 43 Since the force is weak, it is possible to avoid the lens frame measuring element 37 from colliding with the target lens Lm by increasing the moving speed of the lens measuring element 36 to some extent.

The separation position where the lens shape measuring element 36 deviates from the rear refractive surface of the lens shape Lm can be determined by the linear scale 40 detecting the position when the lens shape measuring element 36 is raised.
The position in the horizontal direction of the lens shape measuring element 36 at this separation position is obtained from the detection signal of the linear scale 24. Therefore, the position at which the lens shape measuring element 36 deviates from the rear refracting surface of the lens shape Lm can be obtained as three-dimensional coordinate data by the detection signals from the linear scales 24 and 40 at the separation position.
Further, based on the three-dimensional coordinate data, the actuator motor 50 is driven and controlled to adjust the height of the free end portion of the lift position regulating lever 49, thereby adjusting the height of the free end portion of the holding lever 47. Thus, the target lens 36 can be adjusted to a height corresponding to the periphery of the target lens Lm held by the target lens holder (not shown).
Thereafter, the arithmetic control circuit 52, a driving motor 18 controls and drives the rotation of the driving motor 18 is transmitted to the slider 15 by the wire 20, provided in the lens shape measuring element 36 as shown in FIG. 18 vertical The slider 15 is controlled to move along the guide rail 14 so that the back surface 36c of the portion 36b moves until it comes into contact with the peripheral surface of the target lens Lm held by the target lens holder (not shown). Then, as shown in FIG. 18, the back surface 36 c of the vertical portion 36 b provided on the lens shape measuring element 36 is brought into contact with the peripheral surface of the lens shape Lm.

  As the rotary base 9 rotates, the slider 15 and a large number of components provided on the slider 15 rotate horizontally integrally with the rotary base 9, and the target for the target lens 36 is the peripheral surface (edge end) of the target lens Lm. And slide along. At this time, since the slider 15 moves along the guide rail 14 together with the lens frame measuring element 37, the movement amount when the slider 15 moves from the origin position of the slider 15 is the amount of movement of the lens-shaped measuring element 36. This is the same as the amount of movement of the tip (the point of contact of the lens shape measuring element 36 with the lens shape Lm). This amount of movement is obtained by the arithmetic control circuit 52 from the detection signal of the detection head 26 of the linear scale 24.

  In addition, since the dimension (length) from the center of the probe shaft 35 to the tip of the lens shape measuring element 36 is known, the lens shape measuring element 36 from the rotation center of the rotary base 9 when the slider 15 is at the origin. If the distance from the center of rotation of the rotary base 9 to the target 36 for the target lens changes when the slider 15 moves along the guide rail 14, The change in the distance can be the radius ρi.

  Accordingly, the rotation angle θi of the rotation base 9 due to the rotation of the drive motor 6 is obtained from the number of drive pulses of the drive motor 6, and the radius ρi corresponding to the rotation angle θi is obtained, whereby the peripheral shape of the target lens shape Lm (ball) Mold shape) can be obtained as target lens shape information (θi, ρi) in a polar coordinate format.

When the arithmetic control circuit 52 obtains the target lens shape information (θi, ρi) in step S8, the normal measurement is terminated in step S9. On the other hand, when calculating the target lens shape information (θi, ρi) in step S8, the arithmetic control circuit 52 ends the normal measurement in step S3 and proceeds to step S4.
(II-b) Measurement of the peripheral shape of the band arrangement groove Lg of the target lens Lm (i) Calculation of the set position of the band arrangement groove measuring element 36e to the band arrangement groove Lg
(a) Calculation of the vertical position Zi of the peripheral shape of the target lens shape Lm In the above-described peripheral shape measurement (outer peripheral shape measurement) of the target lens shape Lm (b), only two-dimensional target lens shape information (θi, ρi) is obtained. If not, in step S4, the curvature of the rear refractive surface fb of the target lens shape Lm shown in FIGS. 18 and 19 is calculated by measurement, and the target lens is determined from the calculated curvature and target lens shape information (θi, ρi). By calculating the vertical position Zi on the rear refractive surface fb of the edge (periphery) edge of the target lens shape Lm in the mold shape information (θi, ρi), that is, the vertical position Zi of the peripheral shape of the target lens shape Lm. The original target lens shape information (θi, ρi, Zi) can be obtained.

  As shown in FIG. 19, the curvature of the rear refractive surface fb is such that the upper end portion of the mounting hole measuring element 38 is brought into contact with the rear refractive surface fb of the spectacle lens so that the mounting hole measuring element 38 is By moving in the radial direction from the geometric center of the lens and measuring the distance (position or radius) in the radial direction of the geometric center of the mounting hole probe 38 and the position in the vertical direction, it can be obtained. it can. At this time, the distance (position or moving radius) in the radial direction of the geometric center of the mounting hole probe 38 is determined because the slider 15 moves along the guide rail 14 together with the lens frame probe 37. The amount of movement when the slider 15 moves from the origin position of 15 is the same. This amount of movement is obtained by the arithmetic control circuit 52 from the detection signal of the detection head 26 of the linear scale 24. The vertical position is determined by the arithmetic control circuit 52 from the detection signal of the detection head 42 of the linear scale 40.

  The geometric center of the spectacle lens can be obtained from the target lens shape information (θi, ρi). Since this point is well-known, detailed description is abbreviate | omitted.

  Further, the edge Lm of the target lens shape Lm (the position Zi in the vertical direction of the peripheral edge is determined based on the target lens shape information (θi, ρi), the upper surface of the band arrangement groove measuring element 36e or the upper surface of the lens frame measuring element 37. It can also be calculated by measuring using.

Note that the target lens shape information (θi, ρi, Zi) obtained in this way is not the target lens shape information of the band mounting groove Lg, and therefore the band mounting groove in the target lens shape information (θ0, ρ0, Z0). The set position (θ0, ρ0 ′, Z0 + Δz) of the measuring probe 36e in the band disposition groove Lg is obtained from Z0 and the predetermined value Δz. This predetermined value Δz is a known value that is known in advance from the position of the band disposition groove provided in the dummy lens.
(B) Setting the band arrangement groove probe 36e to the band arrangement groove Lg That is, the arithmetic control circuit 52 determines the shape information (θi, ρi, Zi of the periphery of the rear refractive surface fb of the shape Lm. ) To obtain the position information (θ0, ρ0, Z0) of the measurement start position, and the moving radius ρ0 ′ of the band arranging groove Lg obtained by adding the dimension of the band arranging groove measuring element 36e to the moving radius ρ0. At the same time, the vertical position Z0 + Δz is calculated by adding the height Δz to the position where the band disposition groove Lg is located at the vertical position Z0. This height Δz is a dimension from the periphery of the rear refractive surface fb of the lens Lm to the center in the width direction of the band disposition groove Lg, and a standard one is used.

  In this way, the angle θ0, the moving radius ρ0, and the vertical position Z0 + Δz are set position information (set position data) to the band arrangement groove Lg of the band arrangement groove measuring element 36e.

  In step S4, the arithmetic control circuit 52 controls the operation of the drive motors 6 and 18 and the actuator motor 50 based on the set position information (θ0, ρ0, Z0 + Δz), and the band arrangement groove measuring element 36e is arranged in the band. Inserted into the groove Lg, the tip of the band arranging groove measuring element 36e is brought into contact with the bottom of the band arranging groove Lg.

  At this time, when the band arrangement groove Lg is a square bottom or a flat surface, the band arrangement groove measuring element 36e is lightly brought into contact with the upper edge of the band arrangement groove Lg by the spring force of the coil spring 43. The set position information is (θ0, ρ0, Z0 + Δz ′).

  Further, by setting the spring force of the coil spring 23 to be sufficiently larger than the spring force of the coil spring 43, when the band disposition groove Lg is round bottom, the band disposition groove measuring element 36e becomes the coil spring. The spring force of 23 makes point contact with the round bottom of the band arrangement groove Lg at the center in the width direction of the band arrangement groove Lg. In this case, the initial set position information is (θ0, ρ0, Z0 + Δz ″).

  Thereby, the setting of the band arranging groove measuring element 36e to the band arranging groove Lg is completed. When this setting is completed, the arithmetic control circuit 52 proceeds to step S5.

Incidentally, when the lens shape measuring element 36 is brought into contact with the band arrangement groove Lg of the target lens shape Lm in this way, the target lens shape measuring element 36 has the geometric center Go of the target lens shape Lm shown in FIG. The moving distance from the position X2 brought into contact with the band installation groove Lg to the position X2 is the moving radius ρi ′.
Hereinafter, the measurement of the peripheral shape of the band disposition groove Lg will be described for the case of the initial set position information (θ0, ρ0, Z0 + Δz ′). In the case where the initial set position information is (θ0, ρ0, Z0 + Δz ″), the peripheral shape of the band disposition groove Lg is measured in substantially the same manner as the case of the initial set position information (θ0, ρ0, Z0 + Δz ′). In addition, the information obtained by this measurement can be corrected in substantially the same manner as in the case of the initial set position information (θ0, ρ0, Z0 + Δz ′), and the description thereof will be omitted.
(C) Measurement of the peripheral shape of the band disposition groove Lg In step S5, the arithmetic control circuit 52 drives and controls the drive motor 6 to rotate the drive motor 6 in the normal direction.

  The rotation of the drive motor 6 is transmitted to the driven gear 5 through the pinion 7 and the timing belt 8, and the driven gear 5 is horizontally rotated integrally with the rotation base 9.

  As the rotary base 9 rotates, the slider 15 and a large number of components provided on the slider 15 rotate horizontally integrally with the rotary base 9, and the band arranging groove measuring element 36 e becomes the band arranging groove of the target lens Lm. It slides along Lg. At this time, since the slider 15 moves along the guide rail 14 integrally with the band arranging groove measuring element 36e, the moving amount when the slider 15 moves from the origin position of the slider 15 is the lens frame measuring element. The amount of movement of the tip of 37 is the same. This amount of movement is obtained by the arithmetic control circuit 52 from the detection signal of the detection head 26 of the linear scale 24.

Moreover, since the dimension (length) from the center of the probe shaft 35 to the tip of the band arrangement groove measuring element 36e is known, the band is arranged from the rotation center of the rotary base 9 when the slider 15 is at the origin. If the distance to the tip of the groove measuring element 36e is set in advance, when the slider 15 moves along the guide rail 14, the distance from the rotation center of the rotating base 9 to the band arranging groove measuring element 36e. Even if is changed, the change in the distance can be the moving radius ρi ′ at the bottom of the band arranging groove Lg.
In addition, the arithmetic control circuit 52 uses the position information (Zi + Δz ′) in the vertical direction of the moving radius ρi ′ to detect the detection signal of the detection head 42 of the linear scale 40 and the band arrangement groove measuring element 36e in actuality. It is obtained from the position information in contact with.

  Further, the positional information in the vertical direction of the center in the width direction of the band arrangement groove Lg at the moving radius ρi is (Zi + Δz′−Bt / 2), where Bt is the width of the band arrangement groove Lg.

  Accordingly, the rotation angle θi of the rotation base 9 due to the rotation of the drive motor 6 is obtained from the number of drive pulses of the drive motor 6, and the radius ρi ′ of the band arrangement groove Lg corresponding to this rotation angle θi, the vertical position (Zi + Δz). ′ −Bt / 2), the peripheral shape (lens shape) of the band arrangement groove Lg of the target lens Lm is converted into the three-dimensional band arrangement groove shape information (θi, ρi ′, Zi + Δz′−) in the polar coordinate format. Bt / 2).

  The band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2) can also be referred to as target lens shape information in the band arrangement groove Lg. Further, the peripheral shape (circumferential shape) of the band arrangement groove Lg varies depending on the depth of cut, but three-dimensional band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2) is measured. By doing so, accurate grooving data can be obtained.

The arithmetic control circuit 52 obtains the circumference of the band arrangement groove Lg from the band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2), and calculates the curve value Cv of the band arrangement groove Lg. Ask. Here, assuming that the protruding dimension of the band arranging groove measuring element 36e is t and the depth information of the band arranging groove Lg is hi, the depth information hi of the band arranging groove Lg is:
hi = t− (ρi−ρi ′)
Is obtained by the arithmetic control circuit 52. 26, since the protrusion dimension t is 1.5 mm as shown in FIG. 9A and FIG.
hi = 1.5− (ρi−ρi ′)
It becomes.

  And the arithmetic control circuit 52 will transfer to step S7, if these information is calculated. In step S7, the arithmetic control circuit 52 determines the obtained band arrangement groove shape information (θi, ρi ′, Zi + Δz), the circumference of the band arrangement groove Lg, the curve value of the band arrangement groove Lg, the band arrangement groove Lg. Is transferred to a processing machine (lens peripheral grinding apparatus) (not shown).

  The arithmetic control circuit 52 can obtain the depth information ha having an average value from the depth information hi. Further, the arithmetic control circuit 52 corrects the band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2) from the average depth information ha, and corrects the band arrangement groove shape information (θi, ρi). ″, Zi + Δz′−Bt / 2) and the corrected curve value Cv ′ can be obtained by correcting the curve value Cv from the averaged depth information ha. The correction circumference of the band arrangement groove Lg can be obtained from the correction band arrangement groove shape information (θi, ρi ″, Zi + Δz′−Bt / 2).

  Therefore, even if the depth information hi of the band arrangement groove Lg varies, the correction band arrangement groove shape information (θi, ρi ″, Zi + Δz−Bt / 2) and the correction curve value Cv used for the grooving process. 'And the correction circumference can be transferred as processing data to a processing machine (lens peripheral grinding apparatus) (not shown). In this case, more accurate data for band arrangement groove processing can be obtained.

  As described above, the target lens shape measuring apparatus according to the embodiment of the present invention has a band arrangement that abuts on the band arrangement groove Lg formed in the circumferential direction on the peripheral surface of the lens (lens Lm). A groove measuring element 36e, a measuring element driving device D for moving the band arranging groove measuring element 36e in the circumferential direction of the lens (lens Lm), and a moving position of the band arranging groove measuring element 36e A three-dimensional position detecting device (a configuration including the linear scale 24, the linear scale 40, the motor drive circuit Pd1 of the drive motor 6 and the like) to detect, and the movement position of the band arrangement groove measuring element 36e are determined as the band arrangement groove Lg. Based on a detection signal from the three-dimensional position detection device (a configuration including the linear scale 24, the linear scale 40, the motor drive circuit Pd1 of the drive motor 6 and the like) when moved along And a calculation control circuit 52 for obtaining the 設溝 shape.

According to this configuration, a contact (band arrangement groove measuring element ) is directly inserted into the groove of the lens, and measurement is also performed on the groove shape of the lens, so that a curved three-dimensional ring shape drawn by the groove is obtained. Measure and obtain an accurate groove curve value.

  In the target lens shape measuring apparatus according to the embodiment of the present invention, the arithmetic control circuit 52 obtains the circumferential length of the band arrangement groove Lg from the band arrangement groove shape.

  According to this configuration, an accurate groove curve value can be obtained.

  Further, in the target lens shape measuring apparatus according to the embodiment of the present invention, the band arranging groove measuring element 36e is provided on the target lens shape measuring element which is brought into contact with the peripheral surface of the lens. In addition, the arithmetic control circuit 52 obtains peripheral surface position data of at least one measurement location on the peripheral surface of the lens based on a detection signal from the three-dimensional position detection device by using a lens-shaped measuring element. The groove position data of the band-arranged groove Lg at the one measurement point is obtained by the groove measuring element 36e, and the groove depth of the band-arranged groove Lg is obtained from the peripheral surface position data and the groove position data. It has become.

  According to this configuration, an accurate band arrangement groove shape and an accurate groove curve value can be obtained using the groove depth of the band arrangement groove Lg.

  In the target lens shape measuring apparatus according to the embodiment of the present invention, the band arranging groove measuring element 36e is formed in a tapered shape toward the tip, and has a spherical contact portion at the tip. .

  According to this configuration, even if there are various cross-sectional shapes of the band disposition groove, the band disposition groove measuring element can be disposed in the band disposition groove regardless of the cross-sectional shape of the band disposition groove.

  In the target lens shape measuring apparatus according to the embodiment of the present invention, the arithmetic control circuit 52 obtains three-dimensional position data of at least one measurement location on the peripheral surface of the lens by the lens peripheral surface measuring element, By controlling the operation of the probe driving device D based on the three-dimensional position data, the band arranging groove measuring element 36e is controlled to abut on the band arranging groove Lg of the lens.

  According to this configuration, the band arrangement groove measuring element can be inserted into the band arrangement groove with a simple configuration.

24 ... Linear scale (one component of 3D position detector)
36e: Band arrangement groove measuring element 40: Linear scale (one component of a three-dimensional position detection device)
52... Arithmetic control circuit Lm ... target lens (lens)
Lg ... Band arrangement groove D ... Measuring element drive device Pd1 ... Motor drive circuit (one component of the three-dimensional position detection device)

Claims (6)

A lens holder for holding a lens in which a band disposition groove is formed in the circumferential direction on the peripheral surface;
When measuring the peripheral shape of the lens, the lens is brought into contact with the peripheral surface of the lens.
A lens-shaped measuring element in which a surface for measuring the peripheral shape of the lens is provided as a measurement surface;
A probe driving device for moving the lens probe in the circumferential direction of the lens along the peripheral surface of the lens held by the lens holder ;
A three-dimensional position detection device for detecting a movement position of the target lens shape in a three-dimensional direction ;
The operation of the probe driving device is controlled so that the measurement surface of the target lens shape is brought into contact with the circumferential surface of the lens and moved in the circumferential direction, and the three-dimensional position detection device accompanying this movement is moved from the three-dimensional position detection device. Based on the detection signal, a target lens shape measuring apparatus including an arithmetic control circuit for determining the target lens peripheral shape of the lens as target lens shape information (θi, ρi) ,
With a band arrangement groove measuring element protruding from the measurement surface,
The arithmetic control circuit operates the probe driving device to bring the tip of the band arrangement groove measuring element into contact with the band arrangement groove and to move the lens arrangement in the circumferential direction. A target lens shape measuring device characterized in that a shape in a circumferential direction of a bottom portion of the band arranging groove is obtained as band arranging groove shape information (θi, ρi ′) based on a detection signal from an original position detecting device. In the target lens shape measuring apparatus according to claim 1,
The arithmetic control circuit obtains the band placement groove depth information hi from the band placement groove shape information (θi, ρi ′) and the target lens shape information (θi, ρi), and from the depth information hi. A target lens shape measuring apparatus that obtains an averaged depth information ha of the band-arranged groove and obtains a circumference of the band-arranged groove based on the averaged depth information ha . In the lens shape measuring apparatus according to claim 1 or 2 ,
The arithmetic control circuit drives and controls the three-dimensional driving device to bring a hemispherical probe provided at the upper end of the target lens shape into contact with the rear refractive surface of the lens from below. The lens shape measuring element is moved in the radial direction, the curvature of the rear refractive surface fb of the lens is obtained based on the detection signal from the three-dimensional position detection device, and the curvature and the lens shape information are obtained. While obtaining the target lens shape information (θi, ρi, Zi) of the rear refracting surface fb of the lens based on (θi, ρi), the band arrangement is achieved by controlling the driving of the three-dimensional driving device. And the lens shape information (θi, ρi ′) based on the detection signal from the three-dimensional position detecting device in the lens shape information (θi, ρi ′). ρi ') above the target for the target lens shape The downward movement amount is obtained, and the height Δz from the periphery of the rear refractive surface of the lens to the band disposition groove is obtained based on the movement amount and the target lens shape information (θi, ρi, Zi). A target lens shape measuring apparatus for obtaining band arrangement groove shape information (θi, ρi ′, Zi + Δz) of the band arrangement groove. The target lens shape measuring device according to any one of claims 1 to 3, wherein the band-arrangement groove measuring element is formed in a tapered shape toward the tip, and has a spherical contact with the tip. A target lens shape measuring apparatus having a portion. In the target lens shape measuring apparatus according to claim 3 or 4 ,
The arithmetic control circuit drives and controls the probe driving device so that the band arranging groove measuring element is brought into contact with a bottom and an upper edge of the band arranging groove, and a peripheral edge of the rear refractive surface of the lens. To the upper edge of the band arrangement groove is obtained, and the three-dimensional lens shape information (θi, ρi, Zi) of the lens and the lens shape information of the band arrangement groove (θi, ρi) are obtained. ′), Band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt) at the center in the width direction of the band arrangement groove based on the height Δz ′ and the known width Bt of the band arrangement groove . / 2), and based on the band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2) and the averaged depth information ha, the band arrangement groove shape information (θi, ρi ′, Zi + Δz′−Bt / 2) by correcting Distribution設溝shape information (θi, ρi '', Zi + Δz'-Bt / 2) to seek, the lens shape measuring apparatus and obtains the curve value of the band arrangement設溝.   In the target lens shape measuring apparatus according to claim 5,
  The arithmetic control circuit obtains the circumference of the band-arranged groove based on the correction band-arranged groove shape information (θi, ρi ″, Zi + Δz′−Bt / 2). apparatus.

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