JP2001033348A - Spherical surface measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably measure the spherical surfaces of a lens with a small radius of curvature and a lens with a large radius of convex curvature. SOLUTION: This instrument is equipped with a sphere-segmental ring 1 which is united with a measurer 2 so that an axis A is aligned with the axis of the measurer 2 and has its end surface pressed by the spherical surface of an optical element 18, a 1st swing member 51 which holds the sphere- segmental ring 1, swings the sphere-segmental ring 1 on an axis B crossing the axis A of the sphere-segmental ring 1, and moves the sphere-segmental ring 1 along the axis B, a 2nd swing member 52 which swings the sphere- segmental ring 1 on an axis C crossing the axis A of the sphere-segmental ring 1 and also crossing the axis B of the 1st swing member 51 and moves the sphere-segmental ring 1 along the axis C, a switching means which switches the sphere-segmental ring 1 held by the 1st swing member 51 between a swingable state and a swing-stop state, and a moving means which is mounted with the optical element 18 and moves the optical element so that the center of curvature of the optical element 18 is positioned on a plane containing the intersection of the axes B and C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sphere measuring device for measuring a spherical shape of an optical element such as a lens.

[0002]

2. Description of the Related Art A conventional sphere measuring apparatus for measuring a sphere such as a lens is described in Japanese Patent Application Laid-Open No. Hei 8-233505. FIG. 5 shows a conceptual diagram of this conventional device. The ball missing ring 1 and the tracing stylus 2 are attached to the housing 3 with their respective axes aligned so that the ball missing ring 1 and the tracing stylus 2 are integrated.
The ball-shaped ring 1 has an annular shape with a bottom, and is arranged so that an open portion at a lower end faces the lens 18 side. Further, the tracing stylus 2 extends upward so as to penetrate the housing 3 from the inside of the ball missing ring 1. A lateral hole 4 penetrates the outer peripheral surface of the housing 3 so as to face the same (only one lateral hole 4 is shown in FIG. 5). The lateral hole 4 is a part into which the bearing 5 is fitted, and the diameter thereof matches the outer diameter of the bearing 5, so that the bearing 5 can be fixed without play.

[0005] An X die 6 is arranged around the housing 3. The X die 6 has a flat rectangular shape surrounding the housing 3 as shown only in the diagram of the skeleton. A pair of lateral holes 7 and 8 are formed on the outer periphery of the X die 6 so as to penetrate therethrough. The pair of horizontal holes 7 are provided so as to oppose each other in the Y-axis direction, and the pair of horizontal holes 8 are provided so as to oppose each other in the X-axis direction.

A shaft 9 inserted in the bearing 5 is fitted in each lateral hole 7, whereby the X die 6 and the shaft 9 are integrated through the lateral hole 7. Shaft 9 points to bearing 5 with arrow Y
It is slidable in the direction indicated by a. In addition, X die 6
Is swingable in the Yb direction with respect to the bearing 5 via the shaft 9.

On the other hand, a bearing 13 is fixed in each of the lateral holes 8 without backlash. The shafts 12 are fitted to the respective bearings 13, and the shafts 12 are slidable in the direction of the arrow Xa with respect to the bearings 13. This shaft 12 is connected to the Y die 10. As shown in the diagram, only the skeleton of the Y die 10 has a U-shaped side surface, and a lower hole on both sides thereof is formed with a horizontal hole 11 into which the shaft 12 is fitted and to which the shaft 12 is connected. I have. Therefore, the Y die 10 is integrated with the shaft 12. Further, the X die 6 is swingable in the direction of the arrow Xb with respect to the Y die 0 via the shaft 12.

[0006] Above the Y die 10, a fixed die 16 whose skeleton is shown by a diagram is arranged. A plurality of shafts 15 are implanted downward in the fixed die 16, and the shafts 15 are fitted into bearings 15 a provided on the Y die 10, whereby the fixed die 16 slides vertically. 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 tracing stylus 2, and the fitting portion 12 a engages with a tapered fitting hole 16 a provided at the center of the fixed die 16. ing. The fitting portion 2a and the fitting hole 16a are always engaged with each other and positioned with respect to each other due to the weight of the ball lacking ring 1 and the tracing stylus 2.

[0008] The lens 18 to be measured is a spherical missing ring 1.
, The lens 18 rises and comes into contact with the missing ball ring 1 and the tracing stylus 2.
Eight spherical measurements are made.

In such an apparatus, when the lens 18 is pressed against the edge of the missing ball ring 1 at a constant pressure, the missing ball ring 1 and the tracing stylus 2 are lifted upward simultaneously with the measurement.
The spring 17 is contracted, and the fitting portion 2a of the probe 2 comes off the fitting hole 16a of the fixed die 16. As a result, the ball missing ring 1
And the positioning of the tracing stylus 2 is released. When the surface of the lens 18 is in contact with the edge of the ball lacking ring 1, the tracing stylus 2 slides in the X and Y directions orthogonal to each other and swings around its axis, using the bearings 5 and 13 as guides. I do. Therefore, the spherical missing ring 1 having the tilt mechanism follows the spherical surface of the lens 18, and the inner edge of the spherical missing ring 1 comes into line contact with the spherical surface of the lens 18. At this time, the tip of the tracing stylus 2 is pushed upward by the spherical surface of the lens 18 and is displaced upward, and the displacement is displayed by a tracing stylus amplifier unit (not shown). The radius of curvature of the spherical surface of the lens 18 can be measured based on the displacement amount and the edge diameter of the spherical ring 1.

[0010]

However, in the conventional apparatus, since the center of the swing of the ball lacking ring 1 is on the XY plane formed by the axis of the shaft 9 and the shaft 12, the lens or the convex with a small radius of curvature is used. With respect to the center of curvature of the lens having a large radius of curvature of the shape, the ball lacking ring 1 is located far away from the center. For this reason, for such a lens, the ball lacking ring 1 cannot swing along the spherical surface of the lens 18. As a result, the inner edge of the ball lacking ring 1 does not follow the spherical surface of the lens as described above, so that the reproducibility of the measured value is deteriorated, and a lens having a small radius of curvature or a convex curvature is used. It has a problem that it is not suitable for measuring a lens having a large radius.

The present invention has been made in consideration of such a conventional problem, and performs stable spherical measurement even when measuring a lens having a small radius of curvature or a lens having a large radius of curvature in a convex shape. It is an object of the present invention to provide a sphere measuring device that can perform the measurement.

[0012]

To achieve the above object, the present invention is directed to an apparatus for measuring the spherical shape of an optical element by contacting a probe with the optical element.
And the probe element are integrated with each other so that the axis of the probe element coincides with the probe element, and the spherical surface of the optical element is pressed against the end surface of the ball element. A first swinging member that swings the ball lacking ring around the axis B intersecting the center A and swings the ball lacking ring in the direction of the axis B, and an axis A of the ball missing ring; Crosses with
A second rocking member that rocks the ball lacking ring around an axis C intersecting with the axis B of the first rocking member and moves the ball lacking ring in the direction of the axis C; A switching means for switching the ball-missing ring held by the first rocking member between a rockable state and a rocking stopped state, and the optical element is mounted, and the axis B and the axis C are connected to each other. Moving means for moving the optical element so that the center of curvature of the optical element is located on a plane including the intersection.

In the present invention, the ball lacking ring swings about the axis B as the swing center and swings about the axis C as the swing center, so that the ball missing ring is the intersection of the axis B and the axis C. Swing around the center. Further, the ball lacking ring is movable in the directions of the axis B and the axis C by the first swing member and the second swing member. In addition to this, the moving unit moves the optical element, so that the intersection of the axis B and the axis C, which is the center of the swinging motion of the ball lacking ring, can coincide with the center of curvature of the optical element. . Accordingly, the swing center of the ball lacking ring is on a plane having substantially the same height as the height of the center of curvature of the optical element, so that the ball missing ring can move following the spherical surface of the optical element. Therefore, it is possible to perform stable sphere measurement even when measuring a lens having a small radius of curvature or a lens having a convex shape having a large radius of curvature.

According to a second aspect of the present invention, there is provided the first aspect of the present invention, which includes an intersection between the end face of the ball-cut ring held by the first swinging member and the axis B and the axis C. It is characterized by comprising a distance changing means for relatively changing the distance from the plane.

According to the present invention, since the distance changing means relatively changes the distance between the end face of the ball lacking ring and a plane including the intersection of the axis B and the axis C which is the center of the swing, the curvature is changed. Even optical elements having different radii can be applied to measurement as they are, and a versatile device can be obtained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Elements common to each drawing and the conventional drawing are denoted by the same reference numerals and correspond to each other.

1 and 2 show conceptual diagrams of the present invention, respectively. The difference between FIG. 1 and FIG. 2 is that, in FIG. 1, a pair of bearings 5 are arranged, whereas 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.

In FIG. 1, the ball-missing ring 1 and the tracing stylus 2 are integrated. That is, the ball missing ring 1 is integrated with the tracing stylus 2 in a state where its axis A coincides with the axis of the tracing stylus 2. Lens 1 as an optical element to be measured
Reference numeral 8 denotes a convex lens, and the center of curvature 19 is located below the lens 18. In addition to these, the first swing member 5
The first and second swing members 52 are arranged.

The ball lacking ring 1 is held by a first swinging member 51. The first oscillating member 51 has a U-shaped skeleton as shown in the diagram, and bearings 5 are attached to lower ends on both sides thereof. The bearing 5 is arranged along the Y direction, and the shaft 9 is fitted thereto, so that 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 can be moved. It can swing around B. Therefore, the first swing member 51 acts to swing the ball lacking ring 1 about the axis B as the swing center and to move the ball lacking ring 1 in the direction of the axis B.

The second oscillating member 52 has a U-shape as shown in the diagram of the skeleton thereof.
Is attached. The shaft 12 extends in the X direction and is inserted into the bearing 13. The shaft 12 can be slightly moved in the X direction. Therefore, the second swing member 5
Numeral 2 is movable in the X direction via the shaft 12, and swings integrally as the shaft 12 rotates.

The above-mentioned bearing 5 is connected to both ends of a second rocking member 52, and the ball lacking ring 1 connected to this bearing 5 via a first rocking member 51 is a second rocking member. 52
Is also linked. Accordingly, the movement of the second swing member 52 is also transmitted to the ball missing ring 1, and the ball missing ring 1 is movable in the X direction by the second swing member 52 and is swingable.

In this case, the first oscillating member 51 has an axis B which intersects orthogonally with the axis A of the ball-missing ring 1, and the oscillating of the first oscillating member 51 Is performed around the swing center. Further, the second swinging member 52 has an axis C that orthogonally intersects with the axis A of the ball missing ring 1 and the axis B of the first swinging member 51. Swing is performed with this axis B as the swing center.

Although not shown, the lens 18 is mounted on the moving means, and moves in the vertical direction by driving the moving means, and the center of curvature 19 of the lens 18 also moves in the vertical direction by this movement. This movement is performed by moving the center of curvature 19 of the lens 18 between the axis B of the first swinging member 51 and the second swinging member 5.
This is performed so that the two axes C are located on the XY plane including the intersection point where they intersect. Thus, the XY plane formed by the axes B and C has substantially the same height as the center of curvature of the lens 18.

In such a configuration, the missing ball ring 1 is XY
The center of the swinging movement of the ball lacking ring 1 is on the XY plane having substantially the same height as the height of the center of curvature 19 of the lens 18. Therefore, when the lens 18 is pressed against the edge of the ball lacking ring 1, the movement of the ball missing ring 1 is as follows.
The movement is substantially along the spherical surface of the lens 18. This allows
The ball lacking ring 1 can easily follow the lens 18, and the swinging motion of the ball missing ring 1 can be easily performed. Therefore, it is possible to perform stable sphere measurement even when measuring a lens having a small radius of curvature or a lens having a convex shape having a large radius of curvature.

The relationship between the bearing 5 and the shaft 9 and the bearing 13
With respect to the relationship between the shaft 13 and the first swing member 51, the fixation to the first swing member 51 and the second swing member 52 may be reversed. What is necessary is just to be able to swing. Although the first swing member 51 and the second swing member 52 in FIG. 2 are L-shaped, they can operate in the same manner as in FIG.

(Embodiment 1) FIG. 3 shows Embodiment 1 of the present invention. The ball lacking ring 1 has a bottomed ring shape,
An annular convex portion is provided on the upper part thereof, and a screw formed on the outer peripheral surface of the annular convex portion is attached to the housing 3 by screwing the screw into the housing 3. Stylus 2 in ball missing ring 1
Is fixed. The tracing stylus 2 is fixed so that its axis coincides with the axis A of the ball-missing ring 1.

The tip of the tracing stylus 2 moves up and down when it comes into contact with the spherical surface of the lens 18, and the up and down movement causes the tip of the tracing stylus 2 to be displaced relatively to the inner edge of the ball missing ring 1. . The displacement of the tip of the tracing stylus 2 is
Is output to an amplifier (not shown) via a detection wire 39 connected to the upper end of the sensor, and a display (not shown) connected to the amplifier displays the displacement position.

The housing 3 is arranged in a 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 ball cut ring 1, and are fixed to the housing 3 by bolts 21. The housing 3 and the two X dies 6 are provided with a first
This constitutes a swing member.

The bearing 5 is fixed to the lower part of each of the two X dies 6 by being inserted. Bearing 5
A shaft 9 is inserted in the inside, and the bearing 5 can be slightly moved in the Y direction with respect to the shaft 9. Further, the bearing 5 can swing about the axis B of the shaft 9 in the Yb direction as a swing center. The axis B is provided so as to intersect orthogonally with the axis A of the ball lacking ring 1, whereby the first swing member including the housing 3 and the two X dies 6 can It is swingable in a direction crossing the axis A orthogonally. Therefore, the first swinging member that holds the ball lacking ring 1 has an axis B that intersects orthogonally with the axis A of the ball missing ring 1.
Swings the ball-missing ring 1 in the Yb direction about the pivot center, and acts so as to slightly move the ball-missing ring 1 in the direction of the axis B.

A Y die 10 is attached to the shaft 9. Y
The die 10 has a U-shape extending in the horizontal direction, and is attached to the shaft 9 by screwing a bolt 22 with the shaft 9 inserted into both ends. In this case, two X
The die 6 is located inside the Y die 10. The Y die 10 functions as a second swing member.

A shaft 12 is fixedly inserted into the center of the Y die 10. The shaft 12 is inserted into the bearing 13, and can be slightly moved 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 axis C is provided so as to intersect at right angles with the axis A of the ball lacking ring 1 and the axis B of the first swinging member. Thereby, the Y die 1
0 swings the ball lacking ring 1 in the Xb direction with the axis C intersecting with the axis A of the ball missing ring 1 and intersecting with the axis B of the first swing member in the Xb direction. Acts to move the ball lacking ring 1 in the direction of C. In this case, bearing 1
3 is inserted into the support 25 a of the base 25, and the bolt 24
Is fixed to the column 25a of the base 25 by screwing.

At the rear end of the shaft 12, a stopper bolt 23 for preventing the shaft 12 from jumping out of the bearing 13 is provided. Therefore, the stopper bolt 23 or Y
The Y die 10 can be slightly slid with respect to the support 25 a of the base 25 in a range where the center portion of the die 10 abuts.

The lens 18 to be measured has a convex spherical surface, and the outer peripheral portion is positioned by being inserted into the lens base 6 in a fitted state. The lens base 26 is fixed to an L-shaped movable base 27 by screwing. The movable table 27 can move up and down along a guide rail 28 provided on the side surface of the support 25a of the base 25 in the vertical direction. The vertical movement of the movable table 27 is performed by a cylinder 30 provided on the base 25. Cylinder 30
The piston rod 30a is 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 moving means for moving the lens 18 in the vertical direction, and the pressure can be adjusted by a regulator (not shown).
Acts so as to be able to press against the inner edge of the ball-shaped ring 1.

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 support 25 a of the base 25 with screws.
It is attached to a support 25 a of the base 25. The air chuck 32 has a pair of chuck claws 31 extending above the probe 2, and the probe 2 is gripped by the pair of chuck claws 31. The air chuck 32 fixes the probe 2 by the chuck pawl 31 gripping the probe 2, thereby stopping the swinging of the ball missing ring 1 and releasing the grip of the probe 2 by the chuck pawl 31. By doing so, the ball lacking ring 1 is brought into a swingable state. Therefore, the air chuck 32 is a switching means for switching the ball-missing ring 1 between a swingable state and a swing stop state.

The above-mentioned elevation of the cylinder 30 and the opening and closing of the air chuck 32 can be performed by a manual button (not shown).

In this embodiment, the height of the XY plane formed 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 comes into contact with the ring-shaped inner edge of the ball lacking 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). ).

In this embodiment, the air chuck 32 is closed by a manual button, and the measuring element 2 is gripped by the chuck pawl 31 to fix the position of the ball missing ring 1 to the initial position in the vertical direction. I do. Then, with the piston rod 30a of the cylinder 30 lowered, the lens 18 as an object to be measured is fitted to the lens base 26, and the lens 18 is positioned. With the manual button, the cylinder 30 is driven to raise the lens mount 26, and the spherical surface of the lens 18 is moved to the ring-shaped inner edge of the spherical missing ring 1 and the spherical missing ring 1.
Is pressed against the tip of the tracing stylus 2 at a predetermined pressure.
Due to this pressure contact, the tip of the tracing stylus 2 is raised by the spherical surface of the lens 18.

Next, the air chuck 32 is opened by a manual button, the gripping of the measuring element 2 by the chuck claws 31 is released, and the ball missing ring 1, the measuring element 2 and the housing 3 are changed from the fixed state at the initial position to the open state. I do. As a result, a force that attempts to move to a stable position with respect to the spherical surface of the lens 18, that is, an external force that tries to follow the spherical surface of the lens 18 acts on the ball lacking ring 1. When the center of curvature of the lens 18 is not located above, the pair of X dies 6 are positioned so that the center of curvature of the lens 18 is located on the axis.
Is slightly moved in the Y-axis direction by the sliding of the bearing 5, and the Y die 1
0 is slightly moved in the X direction by sliding of the shaft 12. Also,
The ball missing ring 1 is the intersection of the axis B of the axis 9 and the axis C of the axis 12,
That is, the lens 18 swings by a small amount around the center of curvature of the lens 18.

As a result, the ball missing ring 1 which is a stable position follows the spherical surface of the lens 18, that is, the tracing stylus 2
Is stopped with the center of curvature of the lens 18 positioned on the axis A of the detection end of the lens 18. 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.

As described above, after the measurement is completed, the air chuck 32 is closed by the manual button to fix the ball missing ring 1 at the initial position, and the lens 18 is taken out by lowering the lens base 26 by the cylinder 30.

According to such an embodiment, the spherical missing ring 1 swings around the center of curvature of the lens 18 during the copying movement, so that the spherical missing ring 1 follows the spherical surface of the lens 18 without difficulty. Can be. Therefore, stable measurement can be performed even on a lens that is difficult to follow such as a lens having a small radius of curvature or a convex-shaped lens having a large radius of curvature, and the reproducibility of measurement is improved.

(Second Embodiment) FIG. 4 shows a second embodiment. This embodiment is basically the same as the first embodiment. A pair of X dies 6 in this embodiment
Is made of a magnetic material. A pair of X dies 6
The housing 3 is mounted horizontally between
Fixing holes 34 for fixing the bolts 21
Formed on the die 6. The fixing hole 34 is provided in the housing 3.
Are formed along the height direction of the X-die 6 so that the height position of the X-die 6 can be selected.

In this embodiment, the frame structure of the horizontal housing 3, the bolt 21 for mounting the housing 3, and the pair of X dies 6 having the bearing 5 at the lower end has a U-shape. . Therefore, it can be considered that the magnetic material is integrally protruded above the U-shaped horizontal portion. In such a protruding shape, the whole becomes H-shaped, and the H-shaped horizontal portion functions as a housing.

In this embodiment, the chuck claws 31, the air chuck 32, and the bracket plate 3 of the first embodiment are used.
Instead of 3, a U-shaped mounting plate 35, a magnet 36 mounted on the lower surface of both ends of the mounting plate 35, and a guide cylinder 37 for moving the mounting plate 35 up and down to lower the magnet 36 to the vicinity of the X die 6. Is to be placed. The operation of lifting and lowering the guide cylinder 37 can be performed by a manual button (not shown).

In this embodiment, the guide cylinder 37 is driven by a manual button (not shown) to lower the magnet 36. Due to this lowering, the magnet 36 is positioned near the upper surface of the X die, and the magnetic force of the magnet 36 causes the X die
Is pulled, and the ball missing ring 1 is fixed to the initial position in the substantially vertical direction.

When measuring lenses having different radii of curvature, the lens mount 26 for fixing the lens 18 is replaced, and the bolt 21 for attaching the housing 3 to the X die 6 is removed. Fixing hole 34 such that when the spherical surface of the new lens comes into contact with the inner edge of the ring, the swing center of ball lacking ring 1 becomes near the center of curvature of the lens.
The height of the housing 3 is adjusted by re-inserting the bolt 21 into the housing. Other operation methods and operations are the same as those in the first embodiment.

In such an embodiment, the housing 3
And X die 6 do not need to be changed every time the curvature is different,
Even lenses with greatly different curvatures can be handled with a small setup such as adjusting the height of the housing, and stable measurement is possible.

From the above description, the present invention includes the following inventions.

(1) In an apparatus for measuring the spherical shape of an optical element, a tracing stylus, a spherical segment ring having a common axis with the tracing stylus, and an integral spherical cut-off ring, Two axes, each orthogonal to each other, moving means for slightly moving the ball lacking ring in the respective directions of the two axes, and rotating the ball lacking ring around each of the two axes. A rotating means, and a fixing means for fixing the ball missing ring when the optical element is not pressed against the ball missing ring, and a plane including the two shafts when the optical element of the ball missing ring is pressed against the optical element. A sphere measuring device, wherein the center of curvature of the optical element is located substantially above.

According to the present invention, the center of rotation of the ball lacking ring is on a plane having substantially the same height as the height of the center of curvature of the optical element, so that the ball missing ring can move following the spherical surface of the optical element. Also, when measuring a lens having a small radius of curvature or a convex lens having a large radius of curvature, stable sphere measurement can be performed.

(2) The spherical surface measurement according to the above (1), further comprising a displacement means for displacing the position of the plane including the two axes relative to the spherical missing ring. apparatus.

In the present invention, since the plane including the two axes is displaced, even if the optical elements have different radii of curvature,
It can be measured by simple setup.

[0053]

According to the first aspect of the present invention, since the ball lacking ring can move following the spherical surface of the optical element, a lens having a small radius of curvature or a convex lens having a large radius of curvature is measured. In this case, stable spherical measurement can be performed.

According to the second aspect of the invention, it is possible to measure even optical elements having different radii of curvature by 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 REFERENCE NUMERALS 1 ball missing ring 2 tracing stylus 5 13 bearing 9 12 shaft 18 lens 51 first swing member 52 second swing member

Claims (2)

[Claims] 1. An apparatus for measuring the spherical shape of an optical element by contacting the tracing stylus with an optical element. A ball-shaped ring in which the spherical surface of the optical element is pressed against the end face; and holding the ball-shaped ring, swinging the ball-shaped ring around an axis B intersecting with the axis A of the ball-shaped ring, A first swinging member that moves the ball lacking ring in the direction of the axis B, and an axis C that intersects the axis A of the ball missing ring and intersects the axis B of the first swinging member. A second swinging member that swings the ball lacking ring in the direction of the axis C while swinging the ball lacking ring as a swing center, and is capable of swinging the ball missing ring held by the first swinging member. Switching means for switching between a state and a swing stop state, and the optical element is mounted, and And the axis C
A moving means for moving the optical element such that the center of curvature of the optical element is located on a plane including the intersection with the optical element. 2. A distance changing means for relatively changing a distance between an end surface of the ball-shaped ring held by the first swinging member and a plane including an intersection of the axis B and the axis C. The spherical surface measuring device according to claim 1, wherein: