JPH0752081B2 - Spherical measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the grinding and processing of lenses, which are optical elements,
The present invention relates to a spherical surface measuring device for measuring the radius of curvature on the surface of an optical element.

[Prior Art] A spherical surface measuring device for measuring a radius of curvature on the surface of an optical element in grinding / processing a lens which is an optical element is described in, for example, JP-A-62-68264.

In this spherical surface measuring device, a measuring auxiliary tool is attached to the shaft of the measuring instrument, and a measuring terminal cover that directly contacts the lens is attached to the tip of the measuring auxiliary tool.

In this technique, a Newton prototype is placed on the measuring cover, the value of the measuring instrument at that time is read, and similarly, the value of the processed lens is read and compared to find the curvature of the lens.

The measurement of such a spherical surface is an important inspection item in process control in the lens industry, and the measurement is performed for each process on the processing line.

[Problems to be Solved by the Invention] However, with the technique described in Japanese Patent Laid-Open No. 62-68264, it is difficult to press the measuring cover against the lens and to keep the pressing pressure constant. Especially, when the measurement is performed manually by the operator, the tendency is remarkable. As a result, the measurement error may occur when the measurement cover is in contact with only a part of the edge of the lens, or when the measurement cover is pressed with different pressure. There was a problem of getting bigger.

In addition, if the pressing of the measurement cover against the lens is not constant, the lens may be damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a spherical surface measuring device that can perform measurement without error.

[Means for Solving the Problems] A spherical surface measuring device according to the invention of claim 1 is a base member having a positioning portion, a positioning position at which the positioning member is engaged with the positioning portion by axial movement, and the base member. A tracing stylus capable of taking a positioning release position allowing tilting; an optical element receiving member integrally attached to the tracing stylus;
An elastic body for urging the optical element receiving member in the positioning direction of the tracing stylus and deforming the optical element when the optical element is pressed against the optical element receiving member to move the tracing stylus to the positioning release position. It will be.

In the spherical surface measuring apparatus of the present invention, as shown in FIG. 1A, a measuring element 2 and a lens receiving member (optical element) 3 which are integrated by a fixing member 6 are attached to a base member 1 via an elastic body 5. I will support you. The probe 2 is provided with a fitting portion 2c. On the other hand, the base member 1 is provided with a fitting portion 2c of the probe 2.
A fitting hole 1a for fitting with is provided. Reference numeral 2b is a contact terminal.

Further, in the spherical surface measuring apparatus according to claim 2, a base member provided with a positioning portion made of a flexible elastic body, a measuring element pivotally supported by the positioning portion so as to be tiltable, and an integral body with the measuring element. And a base member and an optical element receiving member forming a spherical pair.

[Operation] According to the spherical surface measuring apparatus of the invention described in claim 1, as shown in FIG. 1B, the lens receiving member 3 and the base member 1
The elastic body 5 inserted between the two always urges the lens receiving portion 3 upward to fit the fitting portion 2c of the tracing stylus 2 and the fitting hole 1a of the base member 1 to each other. Always position in the same position.

When the lens 7 to be measured is pressed against the lens receiving member 3 with a certain constant pressure, as shown in FIG.
The elastic body 5 contracts, the base member 1 and the probe 2 move freely, and the probe 2 tilts along the surface of the lens 7 to be measured having eccentricity and inclination to move to a stable position. 7 can be stably held.

According to the spherical surface measuring apparatus of the second aspect of the invention, the tilting of the tracing stylus is guided by the sliding movement of the optical element receiving member on the hemispherical guiding surface. At that time, since the tracing stylus does not move in the axial direction, the height position of the measurement hardly changes. The point where the tracing stylus moves to a stable position by tilting along the surface of the optical element having an inclination and the optical element can be stably held is
This is the same as the spherical surface measuring apparatus of the invention according to claim 1.

[Embodiment] An embodiment of the spherical surface measuring apparatus according to the present invention will be described below with reference to the drawings.

2 to 4 show the spherical surface measuring apparatus of the first embodiment.

The base member 1 has a tapered fitting hole 1a as a positioning portion.
Is provided. Further, the tracing stylus 2 and the ring-shaped lens receiving member (optical element receiving member) 3 are integrally attached by a fixing screw 6. In the tracing stylus 2, a part of the contact terminal 2b is attached to the support shaft body 2a so as to be retractable. The contact terminal 2b is biased upward by a biasing means (not shown). This probe 2 is the base member 1
It is loosely fitted to the base member 1 so as to be tiltable with respect to. Further, the tracing stylus 2 is provided with a fitting portion 2c which fits in the fitting hole 1a.

The lens receiving member 3 is supported by the base member 1 via a spring (elastic body) 5. This spring 5 is always
The lens receiving member 3 is biased upward, and the fitting portion 2c of the probe 2
And the fitting hole 1a of the base member 1 are fitted to each other, and the probe 2 is always positioned at the same position.

2 to 4, reference numeral 12 indicates a lens holder, and reference numeral 8 indicates a measuring instrument.

In the above state, the measured lens 7 is attached to the lens receiving member 3
As shown in FIG. 3, the spring 5 is pressed against the spring 5.
Shrinks, whereby the probe 2 integrated with the lens receiving member 3 is pushed down, and the fitting portion 2c of the probe 2 and the fitting hole 1a of the base member 1 are disengaged, as shown in FIG. Thus, the probe 2 can be tilted. At that time, even if the lens receiving member 3 is decentered and tilted with respect to the lens 7 to be measured, the lens receiving member 3 tilts following the surface of the lens 7 to be measured, and the lens receiving member 3 is tilted over the entire circumference of the edge of the lens 7 to be measured. The upper end of the lens receiving member 3 contacts, and the lens 7 to be measured can be stably received with a uniform pressure. Further, when the lens receiving member 3 is removed after the measurement, the contact point 2 integrated with the lens receiving member 3 is also lifted by the action of the spring 5. as a result,
The fitting portion 2c of the tracing stylus 2 and the fitting portion 1a of the base member 1 are fitted to each other, and the tracing stylus 2 is positioned at the original position.

As described above, according to the present embodiment, even if the lens receiving member 3 is decentered and tilted with respect to the lens 7 to be measured, the lens receiving member 3 tilts following the surface of the lens 7 to be measured, and the lens 7 to be measured 7 Since it can be stably received with a uniform pressure, the radius of curvature of the lens can be obtained without a measurement error and without damaging the lens 7 to be measured.

Further, in this way, the positional deviation (up and down, horizontal deviation) and inclination of the lens receiving member 3 can be automatically corrected, so that automatic measurement is also possible. Even in the measurement by the operator, there is an advantage that even if there is an individual difference in pressing method and pressing force, it can be automatically corrected.

In the spherical surface measuring apparatus of the first embodiment, a rotary actuator may be attached to the base member 1 so as to rotate between the Newton prototype and the processed lens, and each of them may be measured and compared. it can. Also,
In this embodiment, the spring is used as the elastic body, but the same effect can be obtained by using rubber or sponge.

FIG. 5 shows the spherical surface measuring apparatus of the second embodiment.

The spherical measuring device of the second embodiment differs from that of the first embodiment in that, as shown in FIG. 5, a guide 9 provided on the side wall of the base member 1 and the guide 9 in the probe 2 are used. The point is that positioning is performed by the pin 10 implanted at a location corresponding to. FIG. 6A shows the state of the guide 9 and the pin 10 when there is no load, and FIG. 6B shows the state of the guide 9 and the pin 10 when the lens is pressed.

That is, the guide 9 having the V-shaped guide surface 9a and the straight groove 9b on the V-shaped base portion is provided on the two surfaces of the adjacent side walls of the base member 1. The base member 1 below the guide 9 has a long groove wider than the straight groove 9b of the guide 9.
11 are provided. On the other hand, in the tracing stylus 2, two pins 10 are planted at locations corresponding to the guides 9.

In the spherical surface measuring apparatus of the second embodiment, the same effect as that of the spherical surface measuring apparatus of the first embodiment can be obtained.

Further, FIGS. 7A and 7B show a spherical surface measuring apparatus of the third embodiment.

Also in this embodiment, the tracing stylus 2 and the ring-shaped lens receiving member (optical element receiving member) 3 are integrally attached by fixing screws or the like.

The base member 1 has a hemispherical guide concave surface 1d formed on its upper surface (the receiving surface of the lens receiving member 3). On the other hand, the lower surface of the lens receiving member 3 has a shape complementary to the hemispherical guide concave surface 1d so as to fit into the hemispherical guide concave surface 1d.
In addition, a ring-shaped rubber (positioning portion) 13 is attached to the base member 1. The probe 13 is pivotally supported by the rubber 13 so as to be tiltable, and normally the probe 1 is positioned at the same position.

In this embodiment, as shown in FIG. 7 (b), when the lens 7 to be measured is pressed against the lens receiving member 3, the probe 2 is measured along the hemispherical guide concave surface 1d. It follows the lens 7 and tilts. When the lens 7 to be measured is removed, the restoring force of the rubber 13 causes the tracing stylus 2 to return to its original position and be positioned.

In the present embodiment, since the tracing stylus 2 is inclined to the hemispherical guide concave surface 1d, the lens 7 to be measured can be pressed more stably, and the measurement height position hardly changes, and the measurement height position remains constant. It has the advantage of being measurable.

In this embodiment, in order to improve the sliding of the hemispherical surface, it is preferable to use materials having a small friction coefficient for the base member and the lens receiving member.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. There is no end.

[Effect of the Invention] The spherical surface measuring apparatus of the invention according to claim 1 allows a base member having a positioning portion, a positioning position for engaging the positioning portion by axial movement, and tilting with respect to the base member. A tracing stylus capable of taking a positioning release position, and an optical element receiving member integrally attached to the tracing stylus,
An elastic body for urging the optical element receiving member in the positioning direction of the tracing stylus and deforming when the optical element is pressed against the optical element receiving member to move the tracing stylus to the positioning release position. Therefore, the measurement error due to the difference in the pressing method of the optical element by the operator, the pressing pressure, and the measurement error due to the inclination and eccentricity of the object to be measured when performing the automatic measurement are eliminated, and the measurement reliability is improved. This allows
Products with the same quality can be processed.

Further, in the spherical surface measuring apparatus according to claim 2, a base member provided with a positioning portion made of a flexible elastic body, a measuring element pivotally supported by the positioning portion so as to be tiltable, and an integral body with the measuring element. The optical element receiving member, which is attached to the base member and forms a spherical pair with the base member,
In addition to the effect of the spherical measuring device described above, the optical element can be pressed more stably, and the measurement height position is almost unchanged, and the measurement can be performed at a fixed position.

[Brief description of drawings]

1 (a) and 1 (b) are conceptual views of the invention described in claim 1, FIGS. 2 to 4 are sectional views of the first embodiment, and FIG. 5 is a sectional view of the second embodiment. 6 (a) and 6 (b) are partially enlarged views of the second embodiment, and FIGS. 7 (a) and 7 (b) are sectional views of the third embodiment. 1 ... Base member, 2 ... Measuring element, 3 ... Lens receiving member (optical element receiving member), 5 ... Spring (elastic body).

Claims (2)

[Claims] 1. A base member having a positioning portion, a tracing stylus capable of having a positioning position that engages with the positioning portion by axial movement and a positioning cancellation position that allows tilting with respect to the base member, An optical element receiving member integrally attached to the probe, the optical element receiving member,
A spherical measurement comprising: an elastic body that urges the probe in the positioning direction and deforms when the optical element is pressed against the optical element receiving member to move the probe to the positioning release position. apparatus. 2. A base member provided with a positioning portion made of a flexible elastic body, a measuring element pivotally supported by the positioning portion so as to be tiltable, and a base member integrally attached to the measuring element. A spherical surface measuring device comprising: an optical element receiving member forming a spherical pair.