JP4588828B2 - Eyeglass shape measuring device for glasses - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a target lens shape measuring apparatus that measures a three-dimensional shape of a target lens frame by bringing a probe into contact with a lens frame groove of the spectacle frame.
[0002]
[Prior art]
Conventionally, a measuring element that comes into contact with a lens frame groove of a spectacle frame of a lens shape measuring apparatus, for example, Japanese Patent Laid-Open No. 51-119580, which measures the two-dimensional shape of a lens by swinging in a horizontal direction, Measure the three-dimensional shape of the mold, JP-A-61-267732, JP-A-62-46201, JP-A-62-215814, JP-A-1-92055, JP-A-1-305308 and JP-A-7 Various things have been invented, such as -223153.
[0003]
Among these, in the measuring element for measuring the three-dimensional shape of the target lens shape, the direction substantially parallel to the plane formed by the lens frame groove of the spectacle frame, that is, the movement amount in the Z direction, the radial direction along the lens frame groove, That is, the amount of movement in the X direction (or Y direction) is detected by the amount of movement due to the linear movement of the probe in the vertical and horizontal directions.
[0004]
[Problems to be solved by the invention]
Therefore, in these operating states, conflicting elements of high mechanical accuracy and very smooth movement are required. Conventional linear motion is generally based on a combination of ball rows, but it is vulnerable to dirt and dust, and smooth movement is hindered.
[0005]
Accordingly, an object of the present invention is to provide an eyeglass shape measuring apparatus for spectacles equipped with a measuring element that can make movement for measurement very smooth and realize movement with high mechanical accuracy. To do.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 comprises a turntable rotatable in a horizontal direction,
A pulse motor for rotationally driving the turntable;
A moving table disposed on the rotating table so as to be movable back and forth in the horizontal direction ;
A measuring element that is held by the moving table and that abuts on a lens frame groove extending along the inner peripheral surface of the lens frame of the spectacle frame disposed above the moving table ;
A sensor for detecting the amount of movement for detecting the amount of movement of the probe in the horizontal direction;
The pulse motor is operated and controlled to rotate the turntable in the horizontal direction, and based on a detection signal from a sensor for detecting the amount of movement in the horizontal direction for each rotation angle of the turntable in the horizontal direction. An eyeglass shape measuring apparatus for spectacles comprising an arithmetic control circuit for obtaining a horizontal position of a measuring element ,
The measuring element includes a first arm portion that is attached to the movable table so as to be vertically rotatable, a second arm portion that extends vertically upward from the first arm portion, and an upper end portion of the second arm portion. A third arm part extending toward the lens mounting V-groove side of the lens frame, and a spherical contact provided at the tip of the third arm part, formed in a crank shape,
The sensor that detects the amount of movement of the probe in the horizontal direction includes a sensor that detects the amount of movement of the moving base in the horizontal direction, and a rotation angle that detects the rotation angle of the first arm portion in the vertical direction. A detection sensor,
The arithmetic control circuit is configured to detect the vertical movement of the measuring element based on a detection signal from a rotation angle detection sensor that detects a rotation angle of the first arm portion in the vertical direction at every horizontal rotation angle of the turntable. A movement amount in the direction, and a detection signal from the rotation angle detection sensor of the first arm unit and a sensor for detecting the movement amount in the horizontal direction of the movement table for each rotation angle of the rotation table in the horizontal direction. The eyeglass shape measuring apparatus for spectacles is used to obtain the horizontal position of the measuring element based on the detection signal .
[0007]
In order to achieve the above object, the invention according to claim 2 is the target lens shape measuring apparatus according to claim 1, wherein a support frame provided on the turntable;
A link mechanism that supports the movable table in a horizontal direction and a vertical direction on the support frame;
A rotation angle detection sensor for detecting rotation of the link mechanism;
The arithmetic control circuit is configured to detect the rotation angle of the stylus based on a rotation angle detection signal of the probe from the rotation angle detection sensor and a rotation angle detection signal of the link mechanism from the rotation angle detection sensor. The three-dimensional shape of the lens frame of the lens frame is measured by obtaining the vertical and horizontal positions of the probe for each rotation angle in the direction .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Device configuration]
In FIG. 1, reference numeral 1 denotes a boss portion (holding cylinder) provided on a base (not shown), 2 denotes a rotating shaft disposed in the boss portion 1, and 3 denotes a rotating shaft 2 rotatably held on the boss portion 1. The radial bearing (bearing), 4 is a rotating table (base, rotating plate) integrally provided at the upper end of the rotating shaft 2, 5 is a moving table (moving body) disposed on the rotating table 4, Reference numeral 6 denotes a wheel which is attached to the movable table 5 and supports the movable table 5 on the rotary table 4 so as to be linearly movable back and forth (horizontal direction) in FIG. The wheel 6 is rotatably held on the support shaft 5a of the moving table 5 via a radial bearing (not shown). The movable table 5 is held by a guide rail (not shown) so as to be linearly movable back and forth in FIG.
[0011]
The moving table 5 is provided with a measuring element (feeler) 7. The measuring element 7 includes a first arm portion 7a, a second arm portion 7b extending vertically upward with respect to the first arm portion 7a, and a lens mounting V-groove of the lens frame 8 of the spectacle frame from the second arm portion 7b. (Lens frame groove) It is formed in a crank shape from a third arm portion 7c extending in the direction of 8a, a spherical contactor 7d that is integrally provided at the tip of the third arm portion 7c, and the like. The first arm portion 7a is attached to a rotating shaft (swinging fulcrum, rotating fulcrum) 5b via a radial bearing (not shown) so as to be vertically rotatable.
[0012]
Thereby, the spherical contact 7d of the measuring element 7 is brought into contact with the lens mounting V-groove (lens frame groove) 8a in a state where the measuring element 7 is attached to the movable table 5 so as to be swingable up and down. .
[0013]
Moreover, the amount of movement of the moving base 5 in the left-right direction is detected by a movement amount detection sensor 10 such as a linear sensor or a rotary encoder shown in FIG. When a rotary encoder is used, the rotation of the wheel 6 may be detected by the rotary encoder.
[0014]
Further, the moving table 5 is provided with a measuring element rotation angle detection sensor (angle detection means) 12 such as a rotary encoder or a potentiometer for obtaining the vertical rotation angle α of the measuring element 7 concentrically with the rotating shaft 5b. The detection signal of the measuring element rotation angle detection sensor 12 is inputted to the arithmetic control circuit 11. Further, the arithmetic control circuit 11 controls the rotation of the pulse motor 13 and controls the rotation of the turntable 4 by the pulse motor 13.
[0015]
The operation of the target lens shape measuring apparatus having such a configuration will be described.
[0016]
With such a configuration, when measuring the frame shape (lens shape) of the lens mounting V groove (lens frame groove) 8a of the lens frame 8 of the spectacle frame, the lens frame 8 is not shown on the movable table 4 (not shown). While being held by the frame holding device, the spherical contact 7d of the measuring element 7 is brought into contact with the lens mounting V-groove 8a by an urging force of a spring (not shown) for urging the moving base 5. The structure of the frame holding device and the structure of attaching the spring by bringing the spherical contact 7d into contact with the lens mounting V-groove 8a are not essential parts of the present invention, and the structure of a conventionally known frame shape measuring device can be adopted. Therefore, the detailed description is abbreviate | omitted.
[0017]
In this state, when the pulse motor 13 is operated by the arithmetic control circuit 11 and the turntable 4 of FIG. 1 is rotated around the rotation shaft 2 by the pulse motor 13, the spherical contact 7d of the measuring element 7 is attached with a spring. Due to the force, the lens 5 moves along the lens mounting V-groove 8a, and the moving base 5 linearly moves back and forth along a guide rail (not shown), and the measuring element 7 is rotated up and down around the rotation shaft 5b.
[0018]
At this time, the amount of movement of the movable table 5 in the horizontal direction is detected by the movement amount detection sensor 10, and the rotation angle of the measuring element 7 around the rotation axis 5b in the vertical direction is the measuring element rotation angle detection sensor. 12, and detection signals from the sensors 10 and 12 are input to the arithmetic control circuit 11.
[0019]
Here, L, X, Z, Xf, a, α, Δα, ΔZ, ΔX, etc. L: Distance between the center of the rotating shaft 5b and the center of the spherical contact 7d Xa: The moving table 5 is moved from its initial position. Distance when moved Z: Amount of movement of spherical contact 7d in the vertical direction X: Amount of movement of spherical contact 7d in the horizontal direction a: Center of spherical contact 7d of measuring element 7 and center of rotating shaft 5b Is an angle of inclination of the virtual inclination line a when the arms 7a and 7c are horizontal Δα: a change angle of the virtual inclination line a from the angle α ΔZ: when the virtual inclination line a is changed by Δα The amount of movement ΔX of the spherical contact 7d in the vertical direction (Z-axis direction): If the amount of movement of the spherical contact 7d in the horizontal direction when the virtual inclination line a changes by an angle Δα, the horizontal contact of the spherical contact 7d The amount of movement X in the direction is
X = Xa + ΔX = Xa + L {cos α-cos (α-Δα)} (1)
And the amount of movement Z of the spherical contact 7d in the vertical direction is
Z = ΔZ = L · {sin α−sin (α−Δα)} (2)
As required.
[0020]
Accordingly, the arithmetic control circuit 11 obtains the horizontal movement amount Xa of the moving base 5 from the detection signal from the movement amount detection sensor 10, and the angle of the virtual inclination line a from the detection signal from the measuring element rotation angle detection sensor 12. After obtaining Δα, the amount of movement X in the horizontal direction of the spherical contact 7a is obtained based on the equation (1) using the amount of movement Xa, angle Δα, and known L, α. Further, the arithmetic control circuit 11 obtains the vertical movement amount Z of the spherical contact 7a based on the equation (2) using the angle Δα and the known L and α.
[0021]
Moreover, the movement amounts X and Z are obtained as X _i and Z _i by the arithmetic control circuit 11 for each rotation angle θi in the horizontal direction of the rotary shaft 2 and the rotary table 4. Then, the arithmetic and control circuit 11 obtains a moving radius ρ _i from the geometric center of the lens shape of the lens frame 8 to the lens mounting V-groove 8a for each rotation angle θ _i from the moving amount X _i . As a result, three-dimensional mold shape data (θ _i , ρ _i , Z _i ) in which data Z _i in the vertical direction (Z-axis direction) is added to the mold shape data (θ _i , ρ _i ) for each rotation angle θ _i. Is obtained.
[0022]
The three-dimensional mold shape data (θ _i , ρ _i , Z _i ) thus obtained is sent to the lens grinding device, and the raw spectacle lens is ground into the lens shape of the lens frame 8 by the lens grinding device. Let
[0023]
In the above-described embodiment, for convenience of explanation, the amount X of movement of the spherical contact 7d in the horizontal direction and the vertical direction is ignored ignoring the angle of the lens mounting V-groove 8a and the radius (or diameter) of the spherical contact 7d. The amount of movement Z is calculated. However, since the angle of the lens mounting V-groove 8a and the radius (or diameter) of the spherical contact 7d are known, the rotation is actually performed using the radius of the spherical contact 7d and the angle of the lens mounting V-groove 8a. The mold shape data (θ _i , ρ _i , Z _i ) for each angle θ _i is corrected. In other words, the moving radius [rho _i for each rotation angle theta _i is a value up to the valley bottom of the lens mounting V grooves 8a, corrected as Z _i of each rotation angle theta _i is a value in the root of the lens mounting V grooves 8a To do.
[0024]
Further, since the angle of the bevel groove of the tool of the lens grinding apparatus is known, the lens is determined by using the radius of the spherical contact 7d, the angle of the V groove 8a for mounting the lens, the angle of the bevel groove of the tool of the lens grinding apparatus, and the like. The mold shape data (θ _i , ρ _i , Z _i ) is corrected so that the outer peripheral shape when the raw spectacle lens is ground with the tool of the grinding apparatus becomes the target lens shape of the lens frame 8.
[0025]
As described above, by making the movement of the probe 7 a swinging movement, it can be used for the radial type bearing rotating shaft 5b, and since it becomes a rotating movement, a very smooth movement is realized. In addition, by applying a pressure to the bearing in the thrust direction, it is possible to realize a motion with high mechanical accuracy while suppressing play.
[0026]
Further, conventionally, a measurement support shaft extending vertically is attached to a moving table or the like so as to be movable in the vertical direction in which the axis extends and to be rotatable around the axis, and a measuring element is attached to the upper end of the measurement support shaft. Therefore, due to the vertical movement of the measurement support shaft, dust adhering to the measurement support shaft enters the portion of the bearing portion that supports the measurement support shaft on the moving base, and obstructs the smooth vertical movement of the measurement support shaft. .
[0027]
However, according to the present embodiment, since the measuring element 7 and the rotating shaft 5b do not move relative to each other in the axial direction of the rotating shaft 5b, a radial bearing (not shown) is attached to the measuring element 7 on the rotating shaft 5b. It is possible to prevent dust or the like from entering the portion of (1)) and to prevent the probe 7 from being smoothly swung by the dust.
[0028]
In addition, when the probe 7 swings up and down, the tilt in the vertical direction changes during contact movement with the lens mounting V-groove (lens frame groove) 8a, but the tip of the probe 7 is spherically contacted. By providing the child 7d, a structure that is not affected by the inclination can be obtained.
<Modification>
In the embodiment described above, the wheel 6 is rotatably attached to the moving table 5 with a radial bearing (not shown), and the moving table 5 is mounted on the rotating table via the wheel 6 in the left and right (horizontal direction) in FIG. Although it is configured to be supported so as to be able to move forward and backward linearly, it is not necessarily limited to this configuration.
[0029]
For example, as shown in FIG. 3, a pair of support frames 4a extending left and right is provided at intervals in a direction perpendicular to the paper surface of FIG. 3 (see FIG. 4), and each support frame 4a is provided with support columns 20, 20 as shown in FIG. The support frames 4a are mounted on the turntable 4 with a space therebetween, and the support frames 4a are arranged on the turntable 4 at intervals, and the moving table 5 is arranged below the support frames 4a and 4a as shown in FIG. May be attached to the support frames 4a, 4a via the link mechanism 21 so as to be reciprocally movable left and right.
[0030]
This link mechanism 21 can be rotated (or oscillated) left and right in FIG. 3 around the upper ends of the links 22 and 23 arranged at intervals in the left and right in FIG. 3 corresponding to the support frame 4a. The upper ends of the links 22 and 23 have support shafts (horizontal or horizontal shafts) 22a and 23a that are rotatably supported on the support frame 4a via radial bearings (not shown). The link mechanism 21 includes a support plate 24 disposed between the lower ends of the links 22, 22 and 23, 23, and a radial bearing (not shown) so that the support plate 24 can be rotated to the lower ends of the links 22 and 23. It has support shafts (horizontal axis or horizontal axis) 22b, 23b supported via (not shown).
[0031]
The above-described moving table 5 and measuring element 7 are attached to the upper surface of the support plate 24. Also, since the rotation angles (swing angles) β of the links 22 and 23 are the same, a rotary encoder that detects one of the links 22, 22, 23, 23, for example, the rotation angle β of the link 22. A rotation angle detection sensor (angle detection means) 25 such as a potentiometer is attached to one of the support frames 4 a and 4 a as shown in FIG. 4, and the output of this rotation angle detection sensor 25 is input to the arithmetic control circuit 11.
[0032]
The operation of the target lens shape measuring apparatus having such a configuration will be described.
[0033]
With such a configuration, when measuring the frame shape (lens shape) of the lens mounting V groove (lens frame groove) 8a of the lens frame 8 of the spectacle frame, the lens frame 8 is not shown on the movable table 4 (not shown). While being held by the frame holding device, the spherical contact 7d of the measuring element 7 is brought into contact with the lens mounting V-groove 8a by an urging force of a spring (not shown) for urging the moving base 5.
[0034]
In this state, when the pulse motor 13 is operated by the arithmetic control circuit 11 and the turntable 4 of FIG. 1 is rotated around the rotation shaft 2 by the pulse motor 13, the spherical contact 7d of the measuring element 7 is attached with a spring. It moves along the lens mounting V-groove 8a by the force. At this time, the links 22 and 23 are rotated (swinged) so that the movable table 5 moves forward and backward in the left and right directions in FIG. 3 together with the support plate 24, and the measuring element 7 is rotated up and down around the rotation shaft 5b. .
[0035]
Further, the rotation angle β of the links 22 and 23 is detected by the rotation angle detection sensor 25, and the rotation angle of the measuring element 7 around the rotation axis 5b in the vertical direction is the measuring element rotation angle detection sensor 12. The detection signals from the sensors 12 and 25 are input to the arithmetic control circuit 11.
[0036]
here,
L1: Length of the links 22, 23 Oa: Center of the support shafts 22a, 23a of the links 22, 23 O: Vertical line β passing through the Oa: Angle of rotation of the links 22, 23 relative to the vertical line Lx: Links 22, 23 The amount of movement Lz in the X direction due to the rotation (or swinging) of the moving base 5 is the amount of movement Xa in the Z direction of the moving base 5 due to the rotation (or swinging) of the links 22 and 23: Distance when moving from the initial position Z: Amount of movement of the spherical contact 7d in the vertical direction X: Amount of movement of the spherical contact 7d in the horizontal direction a: Center and rotation of the spherical contact 7d of the measuring element 7 Virtual inclination line connecting the centers of the axes 5b α: The inclination angle Δα of the virtual inclination line a when the arms 7a and 7c are horizontal Δα: The change angle ΔZ of the virtual inclination line a from the angle α ΔZ: The virtual inclination line a is Δα Movement amount of spherical contact 7d in the vertical direction (Z-axis direction) when the angle changes 'Z: Amount of movement of the spherical contact 7d in the vertical direction (Z-axis direction) when the virtual inclination line b is changed by β. ΔX: Horizontal movement of the spherical contact 7d when the virtual inclination line a is changed by Δα. Assuming that the amount of movement in the direction is, the amount of movement Lx in the horizontal direction and the amount of movement Lz in the vertical direction of the support plate 24 and the movable table 5 are:
Lx = Xa = L1 · sinβ (3)
Lz = Δ′Z = L 1 (1−cos β) (4)
It becomes. Then, the horizontal movement amount X and the vertical movement amount Z of the spherical contact 7d are X = Xa + ΔX = L1 · sinβ + L · {cosα−cos (α−Δα)}, respectively. (5)
Z = ΔZ + Δ′Z = L · {sin α−sin (α−Δα)} + L 1 (1−cos β) (6)
Can be expressed as
[0037]
Accordingly, the arithmetic control circuit 11 from the detection signal from the rotation angle of the detection sensor 25 seeking rotation angle β of links 22 and 23, moving table from the length L1 of the rotation angle β and links 22 and 23 5 is obtained as Xa = L 1 · sin β using equation (3) . Then, the arithmetic control circuit 11 obtains the angle Δα of the virtual inclined line a from the detection signal from the measuring element rotation angle detection sensor 12, and then uses the movement amount Xa, the angle Δα and the known L, α, L1 ( 5) The amount X of movement of the spherical contact 7a in the horizontal direction is obtained based on the equation.
[0038]
Further, the arithmetic control circuit 11 calculates the amount of movement Lz (Δ′Z) in the vertical direction of the movable table 5 from the rotation angle β and the length L1 of the links 22 and 23 using the equation (4) , Δ′Z = Calculated as L1 · (1-cosβ). On the other hand, the arithmetic control circuit 11 calculates the amount of movement ΔZ in the vertical direction of the spherical contact 7a only by the rotation of the measuring element 7 from the angle Δα and the known L and α, ΔZ = L · {sin α−sin (α−Δα )}. Then, the arithmetic control circuit 11 obtains the movement amount Z of the spherical contactor 7a in the vertical direction based on the equation (6) using the obtained movement amounts ΔZ and ΔZ.
[0039]
Moreover, the movement amounts X and Z are obtained as X _i and Z _i by the arithmetic control circuit 11 for each rotation angle θ _{i in} the horizontal direction of the rotary shaft 2 and the rotary table 4. Then, the arithmetic and control circuit 11 obtains a moving radius ρ _i from the geometric center of the lens shape of the lens frame 8 to the lens mounting V-groove 8a for each rotation angle θ _i from the moving amount X _i . As a result, three-dimensional mold shape data (θ _i , ρ _i , Z _i ) in which data Z _i in the vertical direction (Z-axis direction) is added to the mold shape data (θ _i , ρ _i ) for each rotation angle θ _i. Is obtained.
[0040]
Also in this modification, as in the example shown in FIG. 1, by using only the radial bearing, by using the radial bearing (not shown) for the movement of the spherical contact 7d, in the horizontal direction (X direction) In addition, the spherical contact 7d can move very smoothly in the vertical direction (Z direction). In addition, by applying a preload in the thrust direction to the above-mentioned radial bearing (not shown) by a biasing means such as a disc spring or other springs (not shown), the play of the support portion by the radial bearing is suppressed. Therefore, a motion with high mechanical accuracy can be realized at the support portion by each radial bearing. This point is the same as in the embodiment of FIG.
[0041]
【The invention's effect】
Since the inventions of claims 1 and 2 are configured as described above, the measuring element can be swingably attached to the moving body via the radial bearing. As a result, the movement of the measuring element for measurement can be reduced. It can be very smooth and can achieve high mechanical accuracy.
[0042]
Moreover, it is possible to accurately obtain the target lens shape data by accurately obtaining the movement amount of the measuring element by the calculation means.
[0043]
The measuring element includes a first arm portion attached to the movable body so as to be swingable up and down, a second arm portion extending vertically upward with respect to the first arm portion, and a lens frame groove extending from the second arm portion. Since the third arm portion extending in the direction is provided, the measuring element can be easily abutted and moved along the lens frame groove even when the measuring element swings up and down.
[0044]
Furthermore, since the tip shape contacting the lens frame groove of the measuring element is formed in a spherical shape, the measuring element can smoothly contact and move along the lens frame groove.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a target lens shape measuring apparatus according to the present invention.
FIG. 2 is a control circuit diagram of FIG. 1;
FIG. 3 is a schematic explanatory view showing another example of the target lens shape measuring apparatus according to the present invention.
4 is a right side view of FIG. 3. FIG.
FIG. 5 is a control circuit diagram of FIG. 2;
[Explanation of symbols]
4 ... Turntable (base)
5 ... Moving table (moving body)
5b: Rotating shaft (swinging fulcrum)
7 ... Measuring element (feeler)
7a ... 1st arm part 7b ... 2nd arm part 7c ... 3rd arm part 7d ... Spherical contactor 8 ... Lens frame 8a ... V groove for lens attachment ( Lens frame groove)

Claims (2)

A turntable that can rotate horizontally;
A pulse motor for rotationally driving the turntable;
A moving table disposed on the rotating table so as to be movable back and forth in the horizontal direction ;
A measuring element that is held by the moving table and that abuts on a lens frame groove extending along the inner peripheral surface of the lens frame of the spectacle frame disposed above the moving table ;
A sensor for detecting the amount of movement for detecting the amount of movement of the probe in the horizontal direction;
The pulse motor is operated and controlled to rotate the turntable in the horizontal direction, and based on a detection signal from a sensor for detecting the amount of movement in the horizontal direction for each rotation angle of the turntable in the horizontal direction. An eyeglass shape measuring apparatus for spectacles comprising an arithmetic control circuit for obtaining a horizontal position of a measuring element ,
The measuring element includes a first arm portion that is attached to the movable table so as to be vertically rotatable, a second arm portion that extends vertically upward from the first arm portion, and an upper end portion of the second arm portion. A third arm part extending toward the lens mounting V-groove side of the lens frame, and a spherical contact provided at the tip of the third arm part, formed in a crank shape,
The sensor that detects the amount of movement of the probe in the horizontal direction includes a sensor that detects the amount of movement of the moving base in the horizontal direction, and a rotation angle that detects the rotation angle of the first arm portion in the vertical direction. A detection sensor,
The arithmetic control circuit is configured to detect the vertical movement of the measuring element based on a detection signal from a rotation angle detection sensor that detects a rotation angle of the first arm portion in the vertical direction at every horizontal rotation angle of the turntable. A movement amount in the direction, and a detection signal from the rotation angle detection sensor of the first arm unit and a sensor for detecting the movement amount in the horizontal direction of the movement table for each rotation angle of the rotation table in the horizontal direction. An eyeglass shape measuring apparatus for spectacles, characterized in that the position of the measuring element in the horizontal direction is obtained based on the detection signal . The target lens shape measuring apparatus according to claim 1, wherein a support frame provided on the turntable;
A link mechanism that supports the movable table in a horizontal direction and a vertical direction on the support frame;
A rotation angle detection sensor for detecting rotation of the link mechanism;
The arithmetic control circuit is configured to detect the rotation angle of the stylus based on a rotation angle detection signal of the probe from the rotation angle detection sensor and a rotation angle detection signal of the link mechanism from the rotation angle detection sensor. An eyeglass shape measuring apparatus for spectacles, which measures the three-dimensional shape of the lens shape of the lens frame by obtaining the position of the measuring element in the vertical direction and the horizontal direction for each rotation angle in the direction .

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