JPH08233505A - Spherical-surface measuring apparatus - Google Patents

Abstract

PURPOSE: To provide the spherical-surface measuring apparatus, which can perform the measurement at uniform pressure without errors. CONSTITUTION: A lens receiving member 1 and a measuring piece 2 form a unitary body. A lateral hole 11 is penetrated in the outer surface of the lens receiving member 1. The diameter of the lateral hole 11 can fix a bearing 3 without backlash. Two lateral holes 12 and 13 are penetrated in the outer surface of an X die 4. The lateral hole 12 is coupled with a shaft 16, and the X die 4 and the shaft 16 form a unitary body. The shaft 16 is coupled with the bearing 3. A lateral hole 14 is penetrated in the outer surface of a Y die 6. The lateral hole 14 is coupled with a shaft 17, and the Y die 6 and the shaft 17 form a unitary body. The shaft 17 is coupled with a bearing 5. The bearing is uprightly provided on the Y die 6. A slidable shaft 9a is coupled with a hole 8b of a fixed die 8. The shaft 9a and the fixed die 8 form a unitary body. A spring 7 is wound around the outer surface of the shaft 9a. A coupling part 2a is provided at a the measuring piece 2. A coupling hole 8a is provided at the fixed die 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical surface measuring apparatus for measuring the radius of curvature of an optical surface when grinding and processing a lens which is an optical element.

[0002]

2. Description of the Related Art Conventionally, as a spherical measuring device for measuring a radius of curvature of an optical surface of a lens, Japanese Patent Laid-Open No. 3-115901 has been known.
There is an invention described in the publication. In the above invention, as shown in FIG. 10, the lens receiving member 50 and the tracing stylus 51, which are integrally mounted, are supported by the base member 52 via the spring 53. The probe 51 is provided with a fitting portion 51b,
A contactless terminal 51a is provided at the tip thereof. On the other hand, the base member 52 is provided with a fitting hole 52a for fitting with the fitting portion 51b of the tracing stylus 51.

In the apparatus having the above structure, when the lens 54 is pressed against the lens receiving member 50 with a certain pressure, the spring 53
Contracts, and the base member 52 and the tracing stylus 51 move freely.
As a result, the lens receiving member 50 tilts following the surface of the measured lens 54 having eccentricity and inclination.

[0004]

In the prior art, however, the elastic force of the spring 53 is used for the lens receiving member 50 to follow the surface of the lens 54 to be measured.
However, when following the eccentricity and inclination of the lens to be measured 54, a large contraction portion and a small contraction portion occur in the spring 53, so that it is not possible to apply a uniform elastic force over the entire circumference of the lens receiving member 50.

Therefore, the lens receiving member 50 cannot apply a uniform pressure over the entire surface of the lens to be measured 54, and the reproducibility of measured values becomes difficult. This tendency becomes remarkable as the eccentricity or inclination of the measured lesbian 54 increases. Further, deterioration of the reproducibility of the measured value due to the aging of the spring 53 cannot be avoided.

An object of claim 1 is to provide a spherical surface measuring device capable of measuring with a uniform pressure without error.

[0007]

According to a first aspect of the present invention, there is provided a base member having a positioning portion, a positioning position which engages with the positioning portion by axial movement, and a positioning release which allows tilting with respect to the base member. A spherical measuring device comprising a measuring element that can take a position, an optical element receiving member that is integrally attached to the measuring element, and an elastic body that restores the measuring element from the positioning cancellation position to the positioning position. The spherical measuring device is provided with a mechanism that slides and rotates in two axial directions of two axes orthogonal to the member.

1 and 2 are conceptual views showing the present invention. The lens receiving member 1 has a cup shape, and the edge of the cup contacts the lens surface. The lens receiving member 1 has a hole formed in the center thereof for fitting with the probe 2, and the probe 2 fitted in the hole is fixed by the fixing member 15 to the lens receiving member 1.
It is integrated with. A lateral hole 11 passing through the central axis and orthogonal to the central axis penetrates the outer peripheral surface of the lens receiving member 1. The diameter of the lateral hole 11 is such that the bearing 3 can be fixed without play.

The X die 4 is located near the outer periphery of the lens receiving member 1. A hole larger than the diameter of the tracing stylus 2 is formed in the center of the X die. On the outer periphery of the X die 4, two lateral holes 12 and 13 that pass through the central axis, are orthogonal to the central axis, and are also orthogonal to each other. The lateral holes 12 and 13 are on the same plane. The lateral hole 12 is fitted with the shaft 16, and the X die 4 and the shaft 16 are integrated by a connecting member. The shaft 16 is fitted to the bearing 3 fixed to the lateral hole 11 of the lens receiving member 1. The diameter of the lateral hole 13 is such that the bearing 5 can be fixed without play.

The Y die 6 is located near the outer periphery of the X die 4. A hole larger than the diameter of the probe 2 is formed in the center of the Y die 6. A lateral hole 14 passing through the central axis and orthogonal to the central axis penetrates the outer periphery of the Y die 6. The lateral hole 14 is fitted to the shaft 17, and the Y die 6 and the shaft 17 are integrated by a connecting member. The shaft 17 is fitted to the bearing 5 fixed to the lateral hole 13 of the X die 4. The bearing 9 is erected on the upper surface of the Y die 6, and the shaft 9a is slidable. The shaft 9a is fitted in the hole 8b of the fixed die 8, and the shaft 9a and the fixed die 8 are integrated by a connecting member. A spring 7 is wound around the outer circumference of the shaft 9a. It should be noted that the probe 2 is provided with a fitting portion 2a. On the other hand, the fixed die 8 is provided with a fitting hole 8a for fitting with the fitting portion 2a.

[0011]

According to the above construction, the spring 7 between the Y die 6 and the fixed die 8 always urges the Y die 6 downward by using the bearing 9 and the shaft 9a as guides, and the fitting portion of the probe 2 is fitted. 2a is fitted in the fitting hole 8a of the fixed die 8, and the probe 2 is always positioned at the same position. Further, when the lens 10 to be measured is pressed against the edge of the lens receiving member 1 with a certain constant pressure, the tracing stylus 2 integrated with the lens receiving member 1 is lifted up simultaneously with the measurement.

Then, the spring 7 is contracted, and the fitting portion 2a of the probe 2 positioned in the fitting hole 8a of the fixed die 8 is released so that the positioning is released and the probe 2 can move freely. . That is, the lens receiving member 1 slides and rotates using the bearing 3 as a guide. Further, the X die 4 supporting the lens receiving member 1 slides and rotates using the bearing 5 as a guide. That is, the lens receiving member 1 having the tilt mechanism follows the curved surface of the lens 10 and stable measurement is possible.

[0013]

[Embodiment 1] FIGS. 3 to 6 show the present embodiment, FIG. 3 is an exploded perspective view, FIG. 4 is a lateral cross sectional view of FIG. 3, and FIG. 5 is a vertical cross sectional view of FIG. 6 and 6 are vertical sectional views taken along the line B-D of FIG.

The ball lacking ring 1a is formed in a ring shape, and the edge of the ring contacts the lens surface. Missing ring 1a
A V-shaped groove is provided on the outer peripheral surface of and is fixed to the lens receiving member 1 by a coupling member 19. A hole for fitting the tracing stylus 2 is formed in the center of the lens receiving member 1, and the fixing member 15
Thus, the lens receiving member 1 and the tracing stylus 2 are integrated. A lateral hole 11 passing through the central axis and orthogonal to the central axis penetrates the outer peripheral surface of the lens receiving member 1. The bearing 3 is fixed to the diameter of the lateral hole 11 without backlash. The bearing 3 has a cylindrical shape, and has a function of both a rotary motion and a sliding motion by being combined with the shaft 16.

The X die 4 is located outside the lens receiving member 1. A hole larger than the diameter of the tracing stylus 2 is formed in the center of the X die 4. Two lateral holes 12 and 13 passing through the central axis and orthogonal to the central axis pass through the outer periphery of the X die 4. The lateral holes 12 and 13 are located at right angles on the same plane. The lateral hole 12 is fitted with the shaft 16, and the connecting member 18 makes X
The die 4 and the shaft 16 are integrated. The bearing 5 is fixed to the diameter of the lateral hole 13 without backlash. The bearing 5 has a cylindrical shape, and has a function of both rotating and sliding when combined with the shaft 17.

The Y die 6 is located outside the X die 4. A hole larger than the diameter of the probe 2 is bored in the center of the Y die 6. A lateral hole 14 passing through the central axis and orthogonal to the central axis penetrates the outer peripheral surface of the Y die 6. The lateral hole 14 is fitted with the shaft 17, and the Y die 6 and the shaft 17 are integrated with each other by the connecting member 18. The bearing 9 is fixed to the Y die 6, and the shaft 9a is slidable. The shaft 9a is fitted in the hole 8b of the fixed die 8, and the shaft 9 and the fixed die 8 are integrated by a connecting member. A spring 7 is wound around the outer circumference of the shaft 9a. It should be noted that the probe 2 has a fitting portion 2a.
Is provided. On the other hand, the fixed die 8 is provided with a fitting hole 8a into which the fitting portion 2a is fitted. The cover 30 is fixed by the screw portion of the fixed die 8 to beautify the appearance and prevent dust and dirt from entering the bearing.

In the apparatus having the above structure, the spring 7 between the Y die 6 and the fixed die 8 has a bearing 9 and a shaft 9a.
The Y die 6 is always urged downward by using the
The fitting portion 2a of 1 is fitted into the fitting hole 8a of the fixed die 8 so that the probe 2 is always positioned at the same position. Further, when the lens 10 to be measured is pressed against the edge of the ball lacking ring 1a with a certain constant pressure, the tracing stylus 2 integrated with the ball lacking ring 1a is pressed and simultaneously lifted up.

In this state, the spring 7 contracts and the fitting portion 2a of the probe 2 positioned in the fitting hole 8a of the fixed die 8 is positioned.
Is released, the positioning is released, and the probe 2 can move freely. Then, the lens receiving member 1 receives the bearing 3
Using the as a guide, it slides and rotates. That is,
The ball lacking ring 1a having a tilt mechanism follows the curvature surface of the lens, and stable measurement is possible. After measurement, Y die 6
By the spring 7 for urging the downward direction,
Is fitted into the fitting hole 8a of the fixed die 8 and is in a positioning state.

According to the present embodiment, even if the lens receiving member 1 is decentered and tilted with respect to the lens, the ball-missing ring 1 is formed.
The lens comes into contact with the lower end of a and the measurement can be performed with a uniform pressure without a measurement error. Moreover, since the rolling bearing has little frictional resistance, it can move without resistance to compound movement.

[0020]

[Embodiment 2] FIGS. 7 to 9 show the present embodiment, FIG. 7 is a lateral cross-sectional view of a main portion, FIG. 8 is a vertical cross-sectional view taken along the line ABC of FIG. 7, and FIG. FIG. This embodiment is the same as the first embodiment.
The bearings 3 and 5 and the shafts 16 and 17 in FIG. 2 are abolished and replaced by shafts 21 and 25, and the other components are the same components, and the same components are designated by the same reference numerals. And its description is omitted.

A lateral hole 20 passing through the central axis and orthogonal to the central axis penetrates the outer peripheral surface of the lens receiving member 1. Side hole 20
The diameter of is such that the shaft 21 is loosely fitted. Also,
The outer peripheral surface of the X die 4 passes through the central axis and is orthogonal to the central axis 2
Two lateral holes 22, 23 pass through. The lateral holes 22 and 23 are in a position orthogonal to each other on the same plane. The lateral hole 22 is the shaft 21.
The X die 4 and the shaft 21 are integrated with each other by the connecting member 18. The diameter of the lateral hole 23 is formed so that the shaft 25 is loosely fitted.

A lateral hole 26 passing through the central axis and orthogonal to the central axis penetrates the outer peripheral surface of the Y die 6. The horizontal hole 26 is the shaft 25
And the Y die 6 and the shaft 25 are integrated by the connecting member 18. The other structure is the same as that of the first embodiment.

In the apparatus having the above-mentioned structure, when the lens to be measured is pressed against the edge of the spherical ring 1a with a certain constant pressure,
Since the spring 7 contracts and the fitting portion 2a of the tracing stylus 2 positioned in the fitting hole 8a of the fixed die 8 separates, the positioning is released and the tracing stylus 2 moves freely. Then
The lens receiving member 1 slides and rotates using the shaft 21 as a guide. Further, the X die 4 supporting the lens receiving member 1 slides and rotates using the shaft 25 as a guide. That is, the ball lacking ring 1a having the tilt mechanism follows the curvature surface of the lens, and stable measurement is possible. Before and after the measurement, the fitting portion 2a of the tracing stylus 2 is fitted into the fixed eighth fitting hole 8a by the spring 7 that urges the Y die 6 downward to be in the positioning state.

According to the present embodiment, since the surface that rotates and slides has sliding friction, the precision is slightly inferior to that of the first embodiment, which is rolling friction, but it can be manufactured at low cost.

[0025]

According to the first aspect of the present invention, since the optical element receiving member is provided with the mechanism for sliding and rotating in the directions of the two axes orthogonal to each other, a tilting mechanism utilizing the elastic force of the elastic body is provided. In contrast, it can be measured without applying excessive resistance.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the present invention.

FIG. 2 is a conceptual diagram showing the present invention.

FIG. 3 is an exploded perspective view showing the first embodiment.

FIG. 4 is a transverse cross-sectional view of FIG.

5 is a vertical cross-sectional view taken along the line ABC of FIG.

6 is a vertical sectional view taken along the line B-D in FIG.

FIG. 7 is a lateral cross-sectional view of a main part showing a second embodiment.

8 is a vertical cross-sectional view taken along the line ABC of FIG.

9 is a vertical sectional view taken along the line B-D in FIG. 7.

FIG. 10 is a vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Lens Receiving Member 2 Measuring Element 3,5 Bearing 4 X Die 6 Y Die 7 Spring 8 Fixing Die 9a Shaft 10 Lens 11, 12, 13, 14 Side Hole 15 Fixing Member 16, 17 Axis

Claims (1)

[Claims] 1. A base member having a positioning portion, a tracing stylus capable of having a positioning position engaged with the positioning portion by axial movement and a positioning cancellation position allowing tilting with respect to the base member, and the tracing stylus. In a spherical measuring device including an optical element receiving member integrally attached to the optical element receiving member and an elastic body that restores the tracing stylus from a positioning cancellation position to a positioning position, in each axial direction of two axes orthogonal to the optical element receiving member. A spherical surface measuring device provided with a mechanism for sliding and rotating.