JP4253403B2 - Spherical measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spherical measuring device that measures the spherical shape of an optical element such as a lens.
[0002]
[Prior art]
A conventional spherical measuring device for measuring a spherical surface of a lens or the like is described in Japanese Patent Laid-Open No. 8-233505. FIG. 5 shows a conceptual diagram of this conventional apparatus. The ball-out ring 1 and the measuring element 2 are attached to the housing 3 in a state in which the respective axis centers coincide with each other, whereby the ball-out ring 1 and the measuring element 2 are integrated. The spherical ring 1 has a bottomed annular shape, and is arranged so that the open portion at the lower end faces the lens 18 side. The measuring element 2 extends upward from the inside of the spherical ring 1 so as to penetrate the housing 3. In the outer peripheral surface of the housing 3, a horizontal hole 4 is penetrated so as to oppose (only one horizontal hole 4 is shown in FIG. 5). The horizontal hole 4 is fitted with the bearing 5, and the diameter thereof matches the outer diameter of the bearing 5, so that the bearing 5 can be fixed without play.
[0003]
An X die 6 is disposed around the housing 3. The X die 6 has a flat square shape surrounding the housing 3 so that only its skeleton is shown in a diagram. A pair of lateral holes 7 and 8 are formed on the outer periphery of the X die 6 so as to pass through. The pair of lateral holes 7 are provided so as to face each other in the Y-axis direction, and the pair of lateral holes 8 are provided so as to face each other in the X-axis direction.
[0004]
Each horizontal hole 7 is fitted with a shaft 9 inserted into the bearing 5, whereby the X die 6 and the shaft 9 are integrated via the horizontal hole 7. The shaft 9 is slidable with respect to the bearing 5 in the direction indicated by the arrow Ya. Further, the X die 6 can swing in the Yb direction with respect to the bearing 5 via the shaft 9.
[0005]
On the other hand, the bearing 13 is fixed to each lateral hole 8 without play. Each bearing 13 is fitted with a shaft 12, and the shaft 12 is slidable in the arrow Xa direction with respect to the bearing 13. The shaft 12 is connected to the Y die 10. The Y die 10 has a U-shaped side surface so that only the skeleton is shown in a diagram, and a lateral hole 11 is formed at the lower end portions on both sides to which the shaft 12 is fitted and the shaft 12 is connected. Yes. Therefore, the Y die 10 is integrated with the shaft 12. Further, the X die 6 is swingable with respect to the Y die 10 via the shaft 12 in the direction of the arrow Xb.
[0006]
Above the Y die 10, a fixed die 16 whose skeleton is shown in a diagram is arranged. A plurality of shafts 15 are planted downward in the fixed die 16, and the shafts 15 are fitted into bearings 15a provided in the Y die 10, whereby the fixed die 16 slides in the vertical direction. It is free. A spring 17 is wound around the outer periphery of the shaft 15.
[0007]
A tapered fitting portion 2 a is formed at the upper end of the measuring element 2, and this fitting portion 12 a is engaged with a tapered fitting hole 16 a provided in the center of the fixed die 16. The fitting portion 2a and the fitting hole 16a are always in an engaged state and are positioned relative to each other due to the weight of the spherical ring 1 and the measuring element 2.
[0008]
The lens 18 which is the object to be measured is disposed below the spherical notch ring 1, and the lens 18 rises and comes into contact with the spherical missing ring 1 and the measuring element 2, and the spherical surface of the lens 18 is measured by this contact. .
[0009]
In such an apparatus, when the lens 18 is pressed against the edge of the spherical ring 1 with a constant pressure, the spherical ring 1 and the measuring element 2 are lifted upward simultaneously with the measurement, and the spring 17 is contracted to contract the fixed die 16. The fitting portion 2a of the measuring element 2 is detached from the fitting hole 16a. Thereby, the positioning of the ball-out ring 1 and the measuring element 2 is released. When the surface of the lens 18 comes into contact with the edge of the spherical ring 1, the probe 2 slides in the X and Y directions perpendicular to each other with the bearing 5 and the bearing 13 as guides and swings around its axis. To do. For this reason, the spherical notch ring 1 provided with the tilt mechanism follows the spherical surface of the lens 18, and the inner edge of the spherical missing ring 1 makes line contact with the spherical surface of the lens 18. At this time, the tip portion of the probe 2 is pushed upward by the spherical surface of the lens 18 and displaced upward, and this displacement amount is displayed by a probe amplifier unit (not shown). The radius of curvature of the spherical surface of the lens 18 can be measured from the amount of displacement and the edge diameter of the spherical ring 1.
[0010]
[Problems to be solved by the invention]
However, in the conventional apparatus, since the center of swing of the spherical ring 1 is on the XY plane formed by the axis of the shaft 9 and the shaft 12, the curvature of a lens having a small curvature radius or a convex lens having a large curvature radius is obtained. With respect to the center position, the spherical ring 1 is located at a position that is largely separated upward. For this reason, for such a lens, the spherical ring 1 cannot be oscillated along the spherical surface of the lens 18. As a result, the inner edge of the spherical ring 1 does not follow the spherical surface of the lens as described above, resulting in poor reproducibility of the measured value, a lens having a small radius of curvature, or a convex curvature. There is a problem that it is not suitable for measuring a lens having a large radius.
[0011]
The present invention has been made in consideration of such conventional problems, and stable spherical measurement can be performed even when measuring a lens having a small curvature radius or a convex lens having a large curvature radius. An object of the present invention is to provide a spherical measuring device.
[0012]
[Means for Solving the Problems]
To achieve the above object, the invention of claim 1, the measuring element is in the apparatus for measuring a spherical shape of the optical element in contact with the optical element, it said has a measuring element integral with said optical element to the end face A spherical notch ring with which a spherical surface is pressed, and the spherical missing ring is held around an axis B that holds the spherical missing ring and intersects the axis A of the spherical missing ring that coincides with the axis of the measuring element. A first oscillating member that moves and moves the spherical ring in the direction of the axis B, and an axis that intersects the axial center A of the spherical ring and intersects the axial center B of the first oscillating member A second rocking member for moving the spherical ring in the direction of the axis C and a spherical ring held by the first rocking member while rocking the spherical ring with the center C as the rocking center. Switching means for switching between a swingable state and a swing stop state, and when the optical element is placed In, characterized in that it comprises a moving means for moving the optical element to the center of curvature of the optical element is positioned on a plane including the axis B and the intersection of the axis C.
[0013]
According to the present invention, the ball notch ring swings about the axis B as the center of swing and swings about the axis C as the center of swing. Therefore, the ball notch ring is centered on the intersection of the axis B and the axis C. Swing. In addition, the spherical ring can be moved in the direction of the axis B and the axis C by the first swing member and the second swing member. In addition to this, the moving means moves the optical element so that the intersection of the axis B and the axis C, which is the center of the swing motion of the spherical ring, can coincide with the center of curvature of the optical element. . As a result, the center of oscillation of the sphere notch ring is on a plane that is substantially the same height as the center of curvature of the optical element, so that the sphere notch ring can move following the spherical surface of the optical element. Therefore, stable spherical measurement can be performed even when measuring a lens having a small curvature radius or a convex lens having a large curvature radius.
[0014]
The invention according to claim 2 is the invention according to claim 1, wherein an end face of the spherical ring held by the first swing member and a plane including an intersection of the axis B and the axis C are provided. A distance changing means for changing the distance relatively is provided.
[0015]
In this invention, the distance changing means relatively changes the distance between the end face of the spherical ring and the plane including the intersection of the axis B and the axis C, which is the center of oscillation, so that the radius of curvature is different. Even if it is an optical element, it can be applied to measurement as it is, and it can be set as a versatile apparatus.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected and corresponded to the element which is common in each figure and a prior art figure.
[0017]
1 and 2 show conceptual diagrams of the present invention, respectively. The difference between FIG. 1 and FIG. 2 is that a pair of bearings 5 are arranged in FIG. 1, whereas the bearing 5 is single in FIG. Due to this difference, the shapes of the X die and the housing (both not shown) as the first swing member 51 to which the bearing 5 is attached are different. However, since the operations of FIGS. 1 and 2 are substantially the same, the concept of the present invention will be described below with reference to FIG.
[0018]
In FIG. 1, the ball-out ring 1 and the measuring element 2 are integrated. That is, the spherical ring 1 is integrated with the measuring element 2 in a state in which the axis A thereof coincides with the axis of the measuring element 2. The lens 18 as an optical element to be measured is a convex lens, and its center of curvature 19 is located below the lens 18. In addition to these, a first swing member 51 and a second swing member 52 are arranged.
[0019]
The ball-out ring 1 is held by the first swing member 51. The first oscillating member 51 has a U shape as shown in a diagram of the skeleton, and the bearings 5 are attached to the lower end portions on both sides thereof. The bearing 5 is disposed along the Y direction, and the shaft 9 is fitted therein, whereby the bearing 5 can be moved by a small distance in the Y direction with respect to the shaft 9 via the bearing 5, and the shaft center of the shaft 9. It can swing around B. Accordingly, the first rocking member 51 acts to rock the spherical ring 1 with the axis B as the rocking center and to move the spherical ring 1 in the direction of the axial B.
[0020]
The second oscillating member 52 has a U-shape as shown in the diagram of the skeleton, and the shaft 12 is attached to the second oscillating member 51. The shaft 12 extends in the X direction and is inserted into the bearing 13. The shaft 12 can be moved minutely in the X direction. Therefore, the second swing member 52 can move in the X direction via the shaft 12 and swings integrally as the shaft 12 rotates.
[0021]
The bearing 5 described above is connected to both ends of the second swing member 52, and the ball-out ring 1 connected to the bearing 5 via the first swing member 51 is also connected to the second swing member 52. Connected. Accordingly, the movement of the second swing member 52 is also transmitted to the ball-notch ring 1, and the ball notch ring 1 can be moved in the X direction by the second swing member 52 and can be swung.
[0022]
In this case, the first rocking member 51 has an axis B that intersects the axis A of the spherical ring 1 orthogonally, and the rocking of the first rocking member 51 rocks the axis B. It is done as a center. The second rocking member 52 has an axis C that intersects the axis A of the spherical ring 1 and the axis B of the first rocking member 51 at right angles. Oscillation is performed with the axis B as the oscillation center.
[0023]
Although not shown, the lens 18 is placed on the moving means, and is moved in the vertical direction by driving the moving means, and the curvature center 19 of the lens 18 is also moved in the vertical direction by this movement. This movement is performed so that the center of curvature 19 of the lens 18 is located on the XY plane including the intersection point where the axis B of the first swing member 51 and the axis C of the second swing member 52 intersect. Thereby, the XY plane formed by the axes B and C is substantially the same height as the center of curvature of the lens 18.
[0024]
In such a configuration, the spherical ring 1 can be moved minutely in the XY direction, and the center of the oscillating motion of the spherical ring 1 is on the XY plane substantially the same height as the center of curvature 19 of the lens 18. It is. For this reason, the movement of the spherical notch ring 1 when the lens 18 is in pressure contact with the edge of the spherical missing ring 1 is a movement substantially along the spherical surface of the lens 18. Thereby, the spherical notch ring 1 becomes easy to follow the lens 18, and the oscillating motion of the spherically absent ring 1 can be easily performed. Therefore, stable spherical measurement can be performed even when measuring a lens having a small curvature radius or a convex lens having a large curvature radius.
[0025]
The relationship between the bearing 5 and the shaft 9 and the relationship between the bearing 13 and the shaft 13 may be reversed with respect to the first rocking member 51 and the second rocking member 52. The relationship between the bearing and the shaft is as follows. It is only necessary that one of them relatively moves relative to the other and can swing. Moreover, although the 1st rocking | fluctuation member 51 and the 2nd rocking | fluctuation member 52 in FIG. 2 are L-shaped, they can act similarly to FIG.
[0026]
(Embodiment 1)
FIG. 3 shows Embodiment 1 of the present invention. The spherical notch ring 1 has a bottomed annular shape, and an annular convex portion is provided on the top thereof, and is attached to the housing 3 by screwing a screw formed on the outer peripheral surface of the annular convex portion into the housing 3. A measuring element 2 is fixed to the spherical ring 1. The measuring element 2 is fixed so that its axis coincides with the axis A of the spherical ring 1.
[0027]
The tip of the probe 2 moves up and down by coming into contact with the spherical surface of the lens 18, and by this vertical movement, the tip of the probe 2 is displaced relative to the inner edge of the spherical ring 1. The displacement of the tip of the probe 2 is output to the amplifier (not shown) via the detection electric wire 39 connected to the upper end of the probe 2, and the display (not shown) connected to the amplifier changes the displacement position. indicate.
[0028]
The housing 3 is arranged in the horizontal direction, and two X dies 6 are fixed on both sides thereof. The two X dies 6 have a shape extending vertically downward from the lower end of the spherical ring 1 and are fixed to the housing 3 by bolts 21. The housing 3 and the two X dies 6 constitute a first swinging member that holds the spherical ring 1.
[0029]
The bearing 5 is inserted and fixed to the lower part of each of the two X dies 6. A shaft 9 is inserted into the bearing 5, and the bearing 5 can move minutely in the Y direction with respect to the shaft 9. Further, the bearing 5 can swing around the axis B of the shaft 9 in the Yb direction as a swing center. The shaft center B is provided so as to intersect perpendicularly to the shaft center A of the spherical notch ring 1, whereby the first oscillating member comprising the housing 3 and the two X dies 6 can be It can swing in a direction perpendicular to the axis A. Therefore, the first rocking member that holds the spherical ring 1 swings the spherical ring 1 in the Yb direction about the pivot center B that intersects the axial center A of the spherical ring 1 orthogonally. , The spherical ring 1 acts in a minute direction in the direction of the axis B.
[0030]
A Y die 10 is attached to the shaft 9. The Y die 10 has a U-shape extending in the horizontal direction, and is attached to the shaft 9 by screwing bolts 22 with the shaft 9 inserted into both ends thereof. In this case, the two X dies 6 are located inside the Y die 10. The Y die 10 functions as a second swing member.
[0031]
A shaft 12 is inserted in a fixed state in the central portion of the Y die 10. The shaft 12 is inserted into the bearing 13 and can move minutely in the X direction with respect to the bearing 13 and can swing in the Xb direction with the axis C of the shaft 12 as the swing center. . The shaft center C is provided so as to intersect the shaft center A of the spherical ring 1 and the shaft center B of the first oscillating member orthogonally. As a result, the Y die 10 swings the spherical notch ring 1 in the Xb direction with the axial center C intersecting with the axial center A of the spherical ring 1 and intersecting the axial center B of the first rocking member. At the same time, it acts to move the spherical ring 1 in the direction of the axis C. In this case, the bearing 13 is inserted into the column portion 25 a of the base 25 and is fixed to the column portion 25 a of the base 25 by screwing the bolt 24.
[0032]
A stopper bolt 23 that prevents the shaft 12 from jumping out of the bearing 13 is provided at the rear end of the shaft 12. Therefore, the Y die 10 can be slid slightly with respect to the column portion 25a of the base 25 within a range where the stopper bolt 23 or the central portion of the Y die 10 abuts.
[0033]
The lens 18 to be measured has a convex spherical surface, and is positioned by inserting the outer peripheral portion into the lens base 6 in a fitted state. The lens base 26 is fixed to an L-shaped moving base 27 by screwing. The movable table 27 can move up and down along a guide rail 28 provided in the vertical direction on the side surface of the support column 25 a of the base 25. The moving table 27 is moved up and down by a cylinder 30 provided on the base 25. The cylinder 30 has a piston rod 30a connected to the lower surface of the moving table 27 via a joint 29 such as a universal joint, and moves up and down when the cylinder 30 is driven. The cylinder 30 functions as a moving means for moving the lens 18 in the vertical direction, and the pressure can be adjusted by a regulator (not shown). The lens 18 is shaped like a ring of the spherical ring 1 with a predetermined amount of force. It works so that it can be pressed against the inner edge.
[0034]
An air chuck 32 is provided above the probe 2. The air chuck 32 is attached to an L-shaped bracket plate 33, and the bracket plate 33 is fixed to the column portion 25 a of the base 25 by screws, so that the air chuck 32 is attached to the column portion 25 a of the base 25. The air chuck 32 has a pair of chuck claws 31 that extend above the measuring element 2, and the measuring element 2 is held by the pair of chuck claws 31. The air chuck 32 fixes the measuring element 2 when the chuck claw 31 holds the measuring element 2, thereby stopping the ball-out ring 1 from swinging, and the chuck claw 31 releases the holding of the measuring element 2. By doing so, the ball-out ring 1 is brought into a swingable state. Therefore, the air chuck 32 serves as a switching means for switching the ball notch ring 1 between a swingable state and a swing stop state.
[0035]
In addition, raising / lowering of the cylinder 30 mentioned above and opening / closing of the air chuck | zipper 32 can be performed with the manual button which abbreviate | omitted illustration.
[0036]
In this embodiment, the height of the XY plane constituted by the axis B of the shaft 9 and the axis C of the shaft 12 (for example, the height from the upper surface of the horizontal portion 25b of the base 25 to the XY plane) is The position of the center of curvature of the lens 18 when the spherical surface of the lens 18 abuts against the ring-shaped inner edge of the spherical ring 1 (that is, the height from the upper surface of the flat portion 25b of the base 25 to the center of curvature of the lens 18). It is adjusted to become.
[0037]
In this embodiment, the air chuck 32 is closed by a manual button, and the measuring element 2 is gripped by the chuck claw 31, thereby fixing the position of the ball notch ring 1 at an initial position in a substantially vertical direction. Then, in a state where the piston rod 30a of the cylinder 30 is lowered, the lens 18 that is the object to be measured is fitted to the lens base 26, and the lens 18 is positioned. The cylinder 30 is driven by the manual button to raise the lens base 26, and the spherical surface of the lens 18 is applied to the ring-shaped inner edge of the spherical notch ring 1 and the tip of the measuring element 2 at the central portion of the spherical notch ring 1 with a predetermined pressure. Press contact. By this pressure contact, the tip of the probe 2 is raised by the spherical surface of the lens 18.
[0038]
Next, the air chuck 32 is opened by the manual button, the gripping of the probe 2 by the chuck claw 31 is released, and the ball-out ring 1, the probe 2 and the housing 3 are changed from the initial state fixed state to the open state. As a result, a force that tries to move to a stable position with respect to the spherical surface of the lens 18, that is, an external force that follows the spherical surface of the lens 18 acts on the spherical ring 1. When the center of curvature of the lens 18 is not located on the upper side, the pair of X dies 6 slightly move in the Y-axis direction by sliding of the bearing 5 so that the center of curvature of the lens 18 is located on the axis. The Y die 10 moves slightly in the X direction as the shaft 12 slides. Further, the spherical ring 1 swings by a minute amount around the intersection of the axis B of the shaft 9 and the axis C of the shaft 12, that is, near the center of curvature of the lens 18.
[0039]
Accordingly, the ball stop ring 1 which is a stable position follows the spherical surface of the lens 18, that is, stops with the center of curvature of the lens 18 positioned on the axis A of the detection tip of the probe 2. . At this time, the radius of curvature (or curvature) of the spherical surface of the lens 18 can be calculated from the display on the display connected to the amplifier.
[0040]
As described above, after the measurement is completed, the air chuck 32 is closed by the manual button to fix the spherical ring 1 to the initial position, and the lens base 26 is lowered by the cylinder 30 to take out the lens 18.
[0041]
According to such an embodiment, since the spherical notch ring 1 swings around the center of curvature of the lens 18 at the time of copying movement, the spherically missing ring 1 can reasonably follow the spherical surface of the lens 18. Therefore, it is possible to perform stable measurement even with a lens that is difficult to follow, such as a lens having a small curvature radius or a convex lens having a large curvature radius, and the reproducibility of the measurement is improved.
[0042]
(Embodiment 2)
FIG. 4 shows the second embodiment. This embodiment is basically the same as the first embodiment. The pair of X dies 6 in this embodiment is made of a magnetic material. A fixing hole 34 for fixing the bolt 21 is formed in the X die 6 in order to attach the housing 3 between the pair of X dies 6 in the horizontal direction and fix the housing 3 with the bolts 21. A plurality of fixing holes 34 are formed along the height direction of the X die 6 so that the height position of the housing 3 can be selected.
[0043]
In this embodiment, the skeleton structure composed of the horizontal housing 3, the bolt 21 to which the housing 3 is attached, and the pair of X dies 6 provided with the bearing 5 at the lower end portion has a U-shaped shape. Therefore, it can be considered that the magnetic material is integrally protruded above the U-shaped horizontal portion. And in the shape which protruded in this way, the whole becomes an H shape, and the horizontal part of an H shape functions as a housing.
[0044]
In this embodiment, instead of the chuck claw 31, the air chuck 32, and the bracket plate 33 in the first embodiment, a U-shaped attachment plate 35, magnets 36 attached to the lower surfaces of both ends of the attachment plate 35, and the attachment plate 35. And a cylinder 37 with a guide for lowering the magnet 36 to the vicinity of the X die 6. In addition, the raising / lowering operation | movement of the cylinder 37 with a guide can be performed with a manual button not shown.
[0045]
In such an embodiment, the guided cylinder 37 is driven by a manual button (not shown) to lower the magnet 36. Since the magnet 36 is positioned in the vicinity of the upper surface of the X die by this descending, the X die 6 is attracted by the magnetic force, and the ball-out ring 1 is fixed to the initial position in the substantially vertical direction.
[0046]
When measuring lenses having different radii of curvature, the lens base 26 for fixing the lens 18 is replaced, the bolt 21 for attaching the housing 3 to the X die 6 is removed, and the ring-shaped ring-shaped ring 1 is removed. The height of the housing 3 is adjusted by reinserting the bolt 21 into the fixing hole 34 so that the center of oscillation of the spherical ring 1 is close to the center of curvature of the lens when the spherical surface of the new lens comes into contact with the inner edge. Other operation methods and operations are the same as those in the first embodiment.
[0047]
In such an embodiment, it is not necessary to change the housing 3 or the X die 6 every time the curvature is different, and even a lens having a large curvature can be handled with a slight setup such as adjusting the height of the housing, and stable measurement is possible. It becomes.
[0048]
From the above description, the present invention includes the following inventions.
[0049]
(1) In an apparatus for measuring the spherical shape of an optical element, a measuring element, a spherical ring integrated with the measuring element and a common axis, and orthogonal to the axis, and each orthogonal Two shafts that move, a moving means that minutely moves the spherical notch ring in the respective directions of the two shafts, and a rotating means that pivots the spherical notch ring around each of the two shafts And a fixing means for fixing the spherical notch ring when the optical element is not press-contacted to the spherical notch ring, and when the optical element of the spherical notch ring is press-contacted, it is optical on a plane including the two axes. A spherical surface measuring device characterized in that the center of curvature of the element is substantially positioned.
[0050]
In this invention, since the center of rotation of the spherical ring is on a plane that is substantially the same height as the center of curvature of the optical element, the spherical ring can move following the spherical surface of the optical element, and the radius of curvature It is possible to perform stable spherical measurement even when measuring a small lens or a convex lens having a large curvature radius.
[0051]
(2) The spherical surface measuring device according to (1) above, further comprising a displacement means for displacing a position of a plane including the two axes relative to the spherical ring.
[0052]
In the present invention, since the plane including the two axes is displaced, even optical elements having different curvature radii can be measured with a simple setup.
[0053]
【The invention's effect】
According to the present invention, since the spherical segment ring can be moved to follow the spherical surface of the optical element, spherical stable even when measuring the radius of curvature of the lens having large curvature radius smaller lenses and convex Measurement can be performed.
[0054]
According to the invention of claim 2, even optical elements having different radii of curvature can be measured with a simple setup.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating the concept of the present invention.
FIG. 2 is another perspective view illustrating the concept of the present invention.
FIG. 3 is a perspective view of the first embodiment.
FIG. 4 is a perspective view of a second embodiment.
FIG. 5 is a perspective view of a conventional spherical measuring device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sphere nose ring 2 Measuring element 5 13 Bearing 9 12 Axis 18 Lens 51 1st rocking member 52 2nd rocking member

Claims (2)

In an apparatus for measuring the spherical shape of an optical element by contacting the optical element with the optical element,
The has a measuring element integral with the sagittal ring spherical surface of the optical element on the end face is pressed against,
The spherical ring is held around the axis B intersecting with the axis A of the spherical notch ring, which coincides with the axis of the measuring element . A first rocking member that moves the ball-out ring in a direction;
The spherical ring is swung around the axis C intersecting the axis A of the spherical ring and the axis B intersecting the axis B of the first rocking member. A second rocking member for moving the notch ring;
Switching means for switching the ball ring held by the first swing member between a swingable state and a swing stop state;
A moving means for moving the optical element so that the center of curvature of the optical element is positioned on a plane including the intersection of the axis B and the axis C, and the optical element is placed;
A spherical surface measuring device comprising:   And a distance changing means for relatively changing a distance between an end face of the spherical ring held by the first swing member and a plane including an intersection of the axis B and the axis C. The spherical surface measuring device according to claim 1.

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