JP2003344218A - Instrument and method for measuring aspherical lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure an outside diameter deviation of an aspherical lens, a face deflection in a peripheral part of an aspherical face, and a curvature center deviation under the same condition as the condition where the aspherical lens is bonded to a mirror frame. <P>SOLUTION: This measuring instrument for the aspherical lens is provided with a suction rotation means 11 for rotating the examined aspherical lens L2 of which the outline shape is circular and of which the one face forms a spherical face, under the condition where the spherical face is sucked, a light emitting means 17 for emitting light toward the central part of the aspherical face of the aspherical lens under the condition where the center of curvature of the spherical face is positioned on a rotary shaft of the suction rotation means, an outside diameter deviation detecting means S1 for abutting to an outer circumferential face of the aspherical lens to detect the outside diameter deviation of the outer circumferential face, under the condition where the center of curvature of the central part of the aspherical face is determined to be positioned on the rotary shaft, based on a photo-receiving position of the light reflected by the aspherical face, and a face deflection detecting means S2 for abutting to the peripheral part of the aspherical face to detect the face deflection in the peripheral part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention measures the amount of outer diameter deflection of an aspherical lens, the amount of surface deflection of a peripheral portion of an aspherical surface, and the amount of deflection of a center of curvature in the same state as when an aspherical lens is put in a lens frame. The present invention relates to a measuring device and a measuring method.

[0002]

2. Description of the Related Art As one of the methods for setting an aspherical lens in a lens frame, after placing the aspherical lens in the lens frame, the outer peripheral surface of the aspherical lens and the inner peripheral surface of the lens frame. The aspherical lens is moved with respect to the lens frame by using a slight clearance between the two, and the center of curvature of one surface of the aspherical lens is positioned on the central axis of the lens frame, and the state is maintained while keeping the state. There is a method of fixing the spherical lens to the lens frame.

Then, the outer diameter deflection amount of the aspherical lens in the same state as that put in the lens frame by this method,
If it is possible to measure the amount of surface runout around the aspherical surface and the amount of runout at the center of curvature,
By measuring the amount of center-of-curvature deflection and examining the lens performance of these aspherical lenses, and by examining the correlation between the amount of outer-diameter deflection, the amount of surface deflection, and the amount of center-of-curvature deflection and lens performance, the aspheric lens It is possible to know how the outer diameter runout amount, the surface runout amount, and the curvature center runout amount affect the lens performance of the aspherical lens when the lens is placed in the lens frame.

However, conventionally, the outer diameter runout amount, the surface runout amount of the peripheral portion of the aspherical surface, and the curvature center runout amount of the aspherical lens which has been put in the same state as that in the lens frame by the above-mentioned method. There was no device or method to measure.

[0005]

It is an object of the present invention to position an aspherical lens in a lens frame and then use the slight clearance between the outer peripheral surface of the aspherical lens and the inner peripheral surface of the lens frame to mirror the aspherical lens. Move it with respect to the frame, position the center of curvature of one surface of the aspherical lens on the center axis of the lens frame, and in the same state as when bonding the aspherical lens to the lens frame while maintaining that state, It is an object of the present invention to provide a measuring device and a measuring method capable of measuring the outer-diameter shake amount of a spherical lens, the surface shake amount of the peripheral portion of an aspherical surface, and the shake center shake amount.

[0006]

SUMMARY OF THE INVENTION An aspherical lens measuring device of the present invention comprises a test aspherical lens having a circular outer shape and one spherical surface,
Suction rotation means for rotating the spherical surface in a suction state,
An adjusting light sending means for irradiating light toward the central part of the aspherical surface of the aspherical lens, with the center of curvature of the spherical surface positioned on the rotation axis of the suction rotating means; The light receiving position for recognizing the light receiving position, which receives the light emitted from the means and reflected by the aspherical surface, and the light receiving position of the reflected light by the adjusting light receiving means, An adjusting discriminating means for discriminating whether or not the center of curvature is located on the rotation axis of the suction rotating means, and the adjusting discriminating means is arranged such that the center of curvature of the central portion of the aspherical surface is located on the rotating axis. In a state where it is determined that the aspherical lens is in contact with the outer peripheral surface of the aspherical lens, the outer diameter deflection detecting means for detecting the outer diameter deflection amount of the outer peripheral surface, and the adjustment determining means, Determined that the center of curvature of the center of the sphere is located on the above-mentioned axis of rotation In it are state, in contact with the periphery of the aspherical surface, it is characterized in that it comprises a surface deflection detecting means for detecting a surface deflection of the peripheral portion.

The shape of the contact portion of the suction rotation means with the spherical surface is circular in plan view and orthogonal to the rotation axis in side view, and the light is directed toward the spherical surface of the aspherical lens. And a light-transmitting means for irradiating the light-receiving means for receiving the light emitted from the light-transmitting means for confirmation and reflected by the spherical surface, and from the light receiving position, the center of curvature of the spherical surface is on the rotation axis of the suction rotation means. It is preferable to include a confirmation determination means for determining whether or not there is any.

Further, a suction rotation means for rotating an aspherical lens under test having a circular outer shape and a spherical surface on one side in a state in which the aspherical surface is suctioned, and an adjusting light sending device for irradiating light to the spherical surface. Means for receiving the light emitted from the adjusting light-transmitting means and reflected by the spherical surface, the light receiving position for recognizing the light receiving position, and the light receiving position of the reflected light by the adjusting light receiving means, The adjusting discriminating means for discriminating whether or not the center of curvature of the spherical surface is located on the rotation axis of the suction rotating means, and the adjusting discriminating means is arranged such that the center of curvature of the spherical surface is located on the rotating shaft. In the state in which it is determined that the spherical surface is in contact with the outer peripheral surface of the aspherical lens to detect the outer diameter deflection amount of the outer peripheral surface, the adjusting determination means is Determined that the center of curvature is located on the rotation axis In this state, the measuring light transmitting means for irradiating light toward the central portion of the aspherical surface, and the light receiving position for receiving the light emitted from the measuring light transmitting means and reflected by the aspherical surface are recognized. And a curvature center shake amount calculating means for calculating the curvature center shake amount of the central portion of the aspherical surface with respect to the rotation axis based on the light receiving position of the reflected light by the measurement light receiving means. You can

Further, the aspherical lens to be inspected, which has a circular outer shape and has aspherical surfaces on both sides, is directed toward a suction rotation means for rotating one aspherical surface in a state in which one aspherical surface is suctioned, and a central portion of the other aspherical surface. Adjusting light sending means for irradiating light, and an adjusting light receiving means capable of recognizing a light receiving position for receiving the light emitted from the adjusting light sending means and reflected by the other aspherical surface, and the adjusting light sending means. An adjusting discriminating means for discriminating whether or not the center of curvature of the central portion of the other aspherical surface is located on the rotation axis of the suction rotating means based on the light receiving position of the reflected light by the light receiving means; When the application determining means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, it contacts the outer peripheral surface of the aspherical lens, Outer diameter runout detecting means for detecting the amount of outer runout, and the above adjustment Determining means, in a state where the center of curvature of the central portion of the other aspherical surface is determined to be located on said rotation axis, in contact with the periphery of the other aspherical surface,
A state in which the surface shake detecting means for detecting the amount of surface shake of the peripheral portion and the adjustment determining means determine that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis. Then, the measuring light sending means for irradiating light toward the central portion of the one aspherical surface, and the light receiving position for receiving the light emitted from the measuring light sending means and reflected by the one aspherical surface, A curvature center shake amount calculation for calculating the curvature center shake amount of the central part of the one aspherical surface with respect to the aspherical surface axis based on the recognizable measurement light receiving means and the light receiving position of the reflected light by the measurement light receiving means. And means.

Further, in the aspherical lens measuring method of the present invention, the aspherical surface of the aspherical lens to be inspected having a circular outer shape and one surface of which is a spherical surface is adsorbed by an adsorbing and rotating means and rotated, and the curvature of the spherical surface is adjusted. Step of irradiating light toward the central portion of the aspherical surface of the aspherical lens in a state in which the center is located on the rotation axis of the suction rotation means, the light reflected by the aspherical surface based on the light receiving position. The adjustment discriminating means for deciding whether or not the center of curvature of the central portion of the aspherical surface is located on the rotation axis of the suction rotation means. In a state where it is determined that the center of curvature of the central portion is located on the rotation axis, the step of detecting the outer diameter deflection amount of the outer peripheral surface of the aspherical lens, and the adjustment determination means are During the curvature of the center of the sphere There has been characterized in a state where it is determined that the are located on the rotating shaft, by a step of detecting the surface deflection amount of the peripheral portion of the aspherical surface.

The contact portion of the suction rotation means with the spherical surface is circular in plan view and is orthogonal to the rotation axis in side view, and the center of curvature of the spherical surface is the suction rotation means. Irradiating the light toward the spherical surface of the aspherical lens after locating it on the axis of rotation of the aspherical lens, and based on the light receiving position of the light reflected by the spherical surface, the center of curvature of the spherical surface is the suction rotation means. It is preferable to have a step of causing the confirmation discriminating means for discriminating whether or not it is on the rotation axis.

Further, a step of adsorbing and rotating an aspherical surface of an aspherical lens to be inspected having a circular outer shape and one surface of which is a spherical surface, a step of irradiating light to the spherical surface, and a step of reflecting by the spherical surface. A step of causing the adjusting discriminating means to discriminate whether or not the center of curvature of the spherical surface is located on the rotation axis of the suction rotating means based on the light receiving position; A step of detecting the outer diameter deviation of the outer peripheral surface of the aspherical lens in a state where it is determined that the center of curvature of the spherical surface is located on the rotation axis, The step of irradiating light toward the central portion of the aspherical surface in a state where it is determined that the center of curvature of is located on the rotation axis, and the light receiving position of the light reflected by the aspherical surface can be recognized. Receiver for various measurements Can have a step step of receiving, and based on the receiving position of the reflected light by the measuring light receiving unit, calculates a center of curvature deflection of the central portion of the aspherical surface with respect to the axis of rotation.

Further, a step of adsorbing one aspherical surface of the aspherical lens to be inspected whose outer shape is circular and both surfaces of which are aspherical surfaces by adsorbing and rotating the aspherical surface by the adsorbing and rotating means, and directing light toward the central portion of the other aspherical surface. The step of irradiating, the light reflected by the other aspherical surface, based on the light receiving position, whether the center of curvature of the central portion of the other aspherical surface is located on the rotation axis of the suction rotation means. The step of causing the adjusting discriminating means to discriminate receives the aspherical surface in a state where the adjusting discriminating means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis. In the step of detecting the outer diameter runout amount of the outer peripheral surface of the lens, the adjustment determination means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, The amount of surface runout around the other aspherical surface When the adjustment determining means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, the adjustment determining means is directed toward the central portion of the one aspherical surface. Based on the light receiving position of the reflected light by the measuring light receiving means, the step of irradiating light, the light reflected by the one aspherical surface, the step of causing the measuring light receiving means to recognize the light receiving position, There may be a step of calculating a curvature center shake amount of a central portion of the one aspherical surface with respect to the rotation axis.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. This embodiment is
The aspherical lens L1 having one surface that is a spherical surface r1 and the other surface that is an aspherical surface r2 is in the same state as when it is placed in a lens frame (not shown), and the outer diameter deflection amount of the aspherical lens L1 is set. Then, the amount of surface wobbling in the peripheral portion of the aspherical surface r2 is measured.

First, the structure of the measuring device for the aspherical lens L1 of this embodiment will be described. A mounting hole 1a is formed on the upper surface of the hollow box-shaped base 1A. Inside the base 1A, there is provided a fixing member 3 having a center hole 3a formed in a vertical direction and having a bottom closed by a glass plate G. A substantially cylindrical first rotating member 5 linked to a motor (not shown) is fitted on the fixed member 3 via a bearing so as to be rotatable about an axis in the vertical direction. The upper portion of the first rotating member 5 projects from the mounting hole 1a to above the base 1A, and the first rotating member 5 is provided with a central hole 5a that is concentric with and communicates with the central hole 3a. An annular second rotating member 7 is fixed to the upper surface of the first rotating member 5, and the second rotating member 7 is provided with a central hole 7a that is concentric with and communicates with the central hole 5a. The bottom surface of the second rotating member 7 is rotatably supported on the upper surface of an annular fixing member 9 fixed to the upper surface of the base 1A. A substantially cylindrical lens holder (adsorption rotation means) 11 is fixed to the upper surface of the second rotating member 7 so as to support the inner surface of the spherical surface r1 of the aspherical lens L1 slightly inside and to open the upper surface. The upper edge of the lens holder 11 has a circular shape in a plan view and the central axis A1 of the lens holder 11 in a side view.
Is orthogonal to. Further, inside the lens holder 11, the central hole 1 that is concentric with and communicates with the central hole 7a.
1a is provided.

The suction pipe 1 is provided on the bottom surface inside the base 1A.
A vacuum device 15 that communicates with the center hole 3 a of the fixing member 3 via 3 is installed. The vacuum device 15 creates a vacuum in each of the central holes 3a, 5a, 7a, 11a,
The aspherical lens L1 which is a lens to be inspected mounted on the upper surface of the lens holder 11 is sucked onto the lens holder 11. Above the lens holder 11, the lens holder 1
1. The outer peripheral surface L1a of the aspherical lens L1 attracted to the upper surface of
And a second contact type sensor (outer diameter shake detecting means) S1 and a second contact type sensor (surface shake detecting means), each of which is provided with a swing type contactor S1a, S2a that makes contact with the periphery of the aspherical surface r2. S2 is provided. These contact sensors S
1 and S2 are connected to a processor (not shown), and this processor is connected to a television monitor (not shown).

An adjusting light transmitting device (adjusting light transmitting means) 17 is arranged above the lens holder 11. The adjusting light transmitting device 17 has a case 19 having a hole 19a formed in the lower surface.
A light source 21 disposed inside the case 19, a reflecting mirror M, a lens L4, a prism P1, a lens L5, a lens L6, and an adjustment sensor (adjustment light receiving means) 23. is there. The adjustment sensor 23 is connected to the processor (adjustment determination means).

Next, the aspherical lens L1 is placed in the same state as that in which it is put in a lens frame (not shown), and the aspherical lens L1 is placed.
A description will be given of a procedure for measuring the outer diameter runout amount of and the surface runout amount of the peripheral portion of the aspherical surface r2.

After the aspherical surface r1 of the aspherical lens L1 processed so that the aspherical surface r2 has an accurate aspherical shape is placed on the upper surface of the lens holder 11, the vacuum device 15 is actuated to move the respective central holes 3a, The inside of 5a, 7a, and 11a is evacuated, and the spherical surface r1 of the aspherical lens L1 is attracted to the lens holder 11. Since the spherical surface r1 and the lens holder 11 are designed so that the frictional resistance between them is extremely small, at this time, the aspherical lens L1 is moved by its own weight to the spherical surface r1.
The center of curvature Os of is automatically moved to a state in which it is located on the central axis (rotational axis) A1 of each central hole 3a, 5a, 7a, 11a. In this state, the motor is operated to rotate the first rotating member 5, the second rotating member 7, the lens holder 11, and the aspherical lens L1 about the central axis A1.

Next, the light source 21 emits light. The emitted light is reflected by the reflecting mirror M, passes through the lens L4, the prism P1, the lens L5, the lens L6, and the hole 19a, and is applied to the central portion of the aspherical surface r2. The light applied to the central portion of the aspherical surface r2 is reflected by the aspherical surface r2, passes through the lenses L6 and L5, is redirected by the prism P1, and is guided to the adjustment sensor 23.

Based on the light receiving position of the light receiving surface of the adjusting sensor 23 at this time, the processor calculates the position of the center of curvature Oo of the central portion of the aspherical surface r2 with respect to the central axis A1.
If the light is received at the reference position on the light receiving surface, the center of curvature O
The fact that o is located on the central axis A1 is displayed on the television monitor, and if light is received at a position other than the reference position, the distance from the central axis A1 to the center of curvature Oo is displayed numerically. If the center of curvature Oo is located on the central axis A1, the aspherical lens L1 is held in that state. If it is not located on the central axis A1, the aspherical lens L1 is placed on the lens holder 11 while watching the television monitor. Move with respect to the center of curvature O
Position o on the central axis A1.

When the center of curvature Oo is positioned on the central axis A1 in this way, the aspherical lens L1 is positioned in a lens frame (not shown), and then the outer peripheral surface of the aspherical lens L1 and the lens frame are separated from each other. Since the center of curvature Oo is located on the central axis of the lens frame by being moved with respect to the lens frame by utilizing a slight clearance between the inner peripheral surfaces, and the state is maintained while being adhered to the lens frame. It will be the same.

The contactor S1a of the first contact type sensor S1 is always in contact with the outer peripheral surface L1a of the aspherical lens L1. If the center of the outer diameter of the aspherical lens L1 is not located on the central axis A1, the contact is made. The child S1a sways in the lateral direction, the processor calculates this swing amount, and the calculated swing amount (outer diameter swing amount)
Is displayed on the TV monitor.

The contact S2 of the second contact type sensor S2
a is always in contact with the peripheral portion of the aspherical surface r2 of the aspherical lens L1, and unless this peripheral portion has a rotationally symmetrical shape with respect to the central axis A1, the contactor S2a swings in the vertical direction, The processor calculates this swing amount, and the calculated swing amount (surface wobbling amount) is displayed on the television monitor.

The outer diameter runout and surface runout of a large number of aspherical lenses were measured by the above procedure, and the lens performance of these aspherical lenses was examined using a master lens (not shown), and the outer diameter runout was measured. The amount of surface runout and the lens performance are investigated, and after positioning the aspherical lens inside the lens frame, use the slight clearance between the outer peripheral surface of the aspherical lens and the inner peripheral surface of the lens frame. Move the aspherical lens with respect to the lens frame, position the center of curvature of one surface of the aspherical lens on the center axis of the lens frame, and bond the aspherical lens to the lens frame while maintaining that state. Under the same condition as above, it is possible to know how the outer diameter runout amount and the surface runout amount affect the lens performance of the aspherical lens.

The decenter amount of the aspherical lens may be calculated by the processor based on the surface runout amount of the peripheral portion of the aspherical surface, and the decenter amount may be displayed on the television monitor. In this case, it is possible to know how the curvature center shake amount and the decenter amount affect the lens performance. Here, the decenter amount means, as shown in FIG. 2, an intersection point Q of the central axis A1 and the aspherical surface r2 and a vertex P of the aspherical surface r2 (a straight line passing through all the centers of curvature at each position of the aspherical surface r2 and the aspherical surface r2). (Intersection point) with the radial distance of the aspherical lens L1.

The decenter amount D in this case is approximately obtained as follows. If the angle formed by the line connecting Q and Oo and the line connecting P and Oo is ε, then ε≈d / φ. In addition, d is the aspherical surface r2 measured by the contactor S2a.
Is the amount of surface runout of the peripheral portion of, and φ is a value obtained by doubling the distance from the outer diameter center of the aspherical lens L1 to the contact point of the aspherical surface r2 and the contactor S2a. Then, by multiplying the distance L from P to Oo by ε, the decenter amount D is approximately obtained. That is, D≈ε × L.

Next, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, the aspherical lens L1 having one surface which is a spherical surface r1 and the other surface which is an aspherical surface r2 is put in the same state as a lens frame (not shown), and its outer diameter is set. The shake amount and the surface shake amount of the peripheral portion of the aspherical surface r2 are measured.

First, the components of the measuring device for the aspherical lens L1 according to the present embodiment, which are not included in the first embodiment, will be described. In addition to the mounting hole 1a, a lighting hole 1b is formed on the upper surface of the base 1B. On the inner bottom surface of the base 1B, a pair of left and right total reflection prisms 25 and 27 located directly below the mounting hole 1a and the lighting hole 1b are installed.

A confirmation light transmitting device (confirmation light transmitting means) 29 is disposed above the light collecting hole 1b. The confirmation light transmitting device 29 includes a case 31 in which holes 31a and 31b are formed on the lower surface and the side surface, a light source 33 disposed inside the case 31, two prisms P2 and P3, and three sheets. Lens L
7, L8, L9 and confirmation sensor (confirmation light receiving means) 3
5 and. The confirmation sensor 35 is connected to the processor (confirmation discrimination means) and (adjustment discrimination means).

An adjusting light transmitting device (adjusting light transmitting means) 37 is disposed above the lens holder 11. The adjusting light-transmitting device 37 includes a case 39 having holes 39a and 39b formed on the side surface and the lower surface thereof, a reflecting mirror M provided inside the case 39, a prism P4, and three lenses L10. L
11, L12 and adjustment sensor (adjustment light receiving means) 41
It consists of and. The adjustment sensor 41 is connected to the processor.

Next, the aspherical lens L1 is placed in the same state as that of a lens frame (not shown), and the procedure for measuring the outer diameter deflection of the aspherical lens L1 and the surface deflection of the aspherical surface r2 is measured. explain.

First, the spherical surface r1 of the aspherical lens L1 is placed on the upper surface of the lens holder 11 to be adsorbed, and when the motor is operated, the light source 33 emits light. Part of the emitted light passes through the prism P2, the lens L7, the prism P3, the lens L8, and the lens L9 of the confirmation light transmitting device 29, is reflected by the total reflection prisms 27 and 25, and is irradiated on the spherical surface r1. . Then, the light reflected by the spherical surface r1 is guided inside the confirmation light transmitting device 29 by the total reflection prisms 25 and 27, transmitted through the lenses L9 and L8, and is changed in direction by the prism P3, and the confirmation sensor 35. Be led to. The processor determines whether light is received at the reference position of the confirmation sensor 35.

If the light is received at the reference position, the spherical surface r
The fact that the center of curvature Os of 1 is located on the central axis A1 is displayed on the television monitor, and if the light is received at a position other than the reference position, the center of curvature Os is not located on the central axis A1. Is displayed.

In this way, the center of curvature O on the central axis A1
When it is confirmed that s is located, the center of curvature Oo of the central portion of the aspherical surface r2 is located on the central axis A1 by the following procedure.

A part of the light emitted from the light source 33 passes through the prism P2 and is guided to the inside of the adjusting light transmitting device 37 through the holes 31b and 39a. This light is reflected by the reflecting mirror M, and the lens L10, the prism P4, and the lens L1.
1, the lens L12, the hole 39a of the case 39, and the central portion of the aspherical surface r2. The light emitted to the central portion of the aspherical surface r2 is reflected by the aspherical surface r2 and the lens L
After passing through the lens 12 and the lens L11, the direction is changed by the prism P4 and is guided to the adjustment sensor 41. Depending on where on the light receiving surface of the adjustment sensor 41 the light is received,
The processor calculates the position of the center of curvature Oo at the center of the aspherical surface r2 with respect to the central axis A1, and displays the result on the television monitor. If the center of curvature Oo is located on the central axis A1, the aspherical lens L1 is held in that state. If it is not located on the central axis A1, the aspherical lens L1 is placed on the lens holder 11 while watching the television monitor. Move against,
The center of curvature Oo is located on the central axis A1.

In this way, when the aspherical lens L1 is put in the same state as when it is put in a lens frame (not shown), the first contact type sensor S1 and the second contact type sensor S2 are the same as in the first embodiment. Using, the outer-diameter deviation of the aspherical lens L1 and the surface deviation of the peripheral portion of the aspherical surface r2 are measured.

As described above, according to this embodiment, not only can the same effects as those of the first embodiment be obtained, but it is possible to determine whether or not the center of curvature Os of the spherical surface r1 is located on the central axis A1. Since it can be visually confirmed on the TV monitor,
The aspherical lens L1 can be measured more accurately.

Next, a third embodiment of the present invention will be described with reference to FIG. The same members as those in the second embodiment are given the same reference numerals and detailed description thereof will be omitted. In this embodiment, the aspherical lens L2, one surface of which is a spherical surface r4, is placed in the same state as that in the lens frame in the opposite direction to the first embodiment, and the outer diameter deflection amount of the aspherical lens L2 and The amount of deflection of the center of curvature of the central portion of the aspherical surface r3 with respect to the central axis A1 is measured. Here, the amount of deflection of the center of curvature of the aspherical surface r3 with respect to the central axis A1 is defined by the aspherical lens L1 of the central axis A1 and the center of curvature Os of the central portion of the aspherical surface r3.
Is defined as the radial distance of.

First, the components of the measuring apparatus of this embodiment different from those of the second embodiment will be described. Inside the measuring light-transmitting device (measuring light-transmitting means) 40 having substantially the same components as the confirming light-transmitting device 29, instead of the confirming sensor 35 of the second embodiment, a measuring sensor (measurement Light receiving means) 43 is provided, and this measuring sensor 43
Is connected to the processor (curvature center shake amount calculation means). Further, the second contact sensor S2 is not provided.

Next, the procedure for measuring the outer diameter shake amount and the curvature center shake amount of the aspherical lens L2 will be described.

First, similarly to the second embodiment, the center of curvature Oo of the spherical surface r4 is positioned on the central axis A1 by using the adjusting light sending device (adjusting light sending means) 37. Part of the light emitted from the light source 33 passes through the adjusting light transmitting device 37 and is applied to the spherical surface r4, and the light reflected by the spherical surface r4 is guided to the adjusting sensor (adjusting light receiving means) 41. The processor calculates the position of the center of curvature Oo of the spherical surface r4 with respect to the central axis A1 in accordance with the position of the light receiving surface of the adjustment sensor 41, and displays the result on the television monitor. If the center of curvature Oo is located on the central axis A1, the aspherical lens L2 is held in that state, and the central axis A1
If it is not located on the upper side, the aspherical lens L2 is moved with respect to the lens holder 11 while watching the TV monitor, and the center of curvature Oo is located on the central axis A1.

In this way, the center of curvature Oo is set to the central axis A1.
If it is positioned above, the aspherical lens L2 will be in the same state as when it is put in the lens frame, and thereafter, as in the first embodiment, the first contact sensor (outer diameter shake detection means) S1. The outer diameter shake amount of the aspherical lens L2 is measured using.

A part of the light emitted from the light source 33 is part of the prism P2, the lens L7, and the prism P2 of the measuring light transmitting device 40.
The light passes through the prism P3, the lens L8, and the lens L9, is reflected by the total reflection prisms 27 and 25, and is irradiated onto the central portion of the aspherical surface r3. Then, the light reflected by the aspherical surface r3 is guided to the inside of the measurement light transmitting device 40 by the total reflection prisms 25 and 27, passes through the lenses L9 and L8, is changed in direction by the prism P3, and is measured by the measurement sensor 43. Be led to.

Then, based on the light receiving position of the measuring sensor 43, the processor causes the aspherical surface r with respect to the central axis A1.
The curvature center shake amount of the central portion of 3 is calculated, and the calculation result is displayed on the television monitor.

In this way, the outer diameter runout and the curvature center runout of a large number of aspherical lenses are measured, and the lens performance of these aspherical lenses is investigated using a master lens (not shown), and the outer diameter runout is determined. By investigating the correlation between the curvature center shake amount and the lens performance, after positioning the aspherical lens in the lens frame, the slight clearance between the outer peripheral surface of the aspherical lens and the inner peripheral surface of the lens frame is used. Move the aspherical lens with respect to the lens frame, position the center of curvature of one surface of the aspherical lens on the center axis of the lens frame, and bond the aspherical lens to the lens frame while maintaining that state. Under the same condition as above, it is possible to know how the outer diameter shake amount and the curvature center shake amount affect the lens performance of the aspherical lens.

Finally, a fourth embodiment of the present invention will be described with reference to FIG. The same members as those in the third embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the present embodiment, the outer diameter runout of the aspherical lens L3 whose both surfaces r5 and r6 are aspherical surfaces, the runout of the peripheral part of the aspherical surface r6, and the center of curvature of the central part of the aspherical surface r5 with respect to the central axis A1. The amount of shake is measured.

The measuring apparatus of this embodiment is the same as the measuring apparatus of the third embodiment except that the second contact type sensor (surface shake detecting means) S2 is used.
The second contact sensor S2 is connected to the processor.

Next, the outer diameter deviation of the aspherical lens L3,
A description will be given of how to measure the surface wobbling amount of the peripheral portion of the aspherical surface r6 and the curvature center wobbling amount of the central portion of the aspherical surface r5 with respect to the central axis A1. First, similarly to the second embodiment, the center of curvature Oo of the central portion of the aspherical surface r6 is positioned on the central axis A1 by using the adjusting light transmitting device 37, and the aspherical lens L3.
Put it in the same state as it was put in the lens frame.

When the aspherical lens L3 is put in the same state as the lens frame in this way, the first contact type sensor S1 and the second contact type sensor S2 are used as in the first embodiment. The outer-diameter shake amount of the aspherical lens L3 and the surface shake amount of the peripheral portion of the aspherical surface r6 are measured.

Further, similarly to the third embodiment, the light source 33
A part of the light emitted from the measurement light transmitting device 40 passes through the prism P2, the lens L7, the prism P3, the lens L8, and the lens L9, and is reflected by the total reflection prisms 27 and 25, and the center of the aspheric surface r5. The area is irradiated. The light reflected by the aspherical surface r5 is guided to the inside of the measurement light transmitting device 40 by the total reflection prisms 25 and 27, and the lenses L9 and L9.
After passing through 8, the direction is changed by the prism P3 and is guided to the measuring sensor 43. Then, based on the light receiving position of the measuring sensor 43, the processor calculates the curvature center shake amount of the central portion of the aspherical surface r5 with respect to the center axis A1, and displays the calculation result on the television monitor.

In this way, the outer diameter runout, surface runout, and curvature center runout of many aspherical lenses were measured, and the lens performance of these aspherical lenses was investigated using a master lens (not shown). After the aspheric lens is positioned inside the lens frame (not shown) by investigating the correlation among the outer diameter shake amount, the surface shake amount, the curvature center shake amount, and the lens performance, the outer peripheral surface of the aspheric lens and the lens frame Using the slight clearance between the inner peripheral surfaces of the aspherical lens, move the aspherical lens with respect to the lens frame, position the center of curvature of one surface of the aspherical lens on the central axis of the lens frame, and change the state. Under the same conditions as when the aspherical lens is bonded to the lens frame while holding it, you can see how the outer diameter runout, surface runout, and curvature center runout affect the lens performance of the aspherical lens. You can

[0054]

According to the present invention, after the aspherical lens is positioned in the lens frame, the aspherical lens is utilized by utilizing a slight clearance between the outer peripheral surface of the aspherical lens and the inner peripheral surface of the lens frame. Under the same conditions as when the aspherical lens was bonded to the lens frame while maintaining that state by positioning the center of curvature of one surface of the aspherical lens on the center axis of the lens frame by moving the Where, the outer diameter runout of the aspherical lens, the surface runout of the peripheral part of the aspherical surface,
It is possible to measure the amount of deflection of the center of curvature.

[Brief description of drawings]

FIG. 1 is an overall view of a measuring device according to a first embodiment of the present invention.

FIG. 2 is a simplified explanatory diagram in a case of obtaining a decenter amount based on a surface wobbling amount.

FIG. 3 is an overall view of a measuring device according to a second embodiment of the present invention.

FIG. 4 is an overall view of a measuring device according to a third embodiment of the present invention.

FIG. 5 is an overall view of a measuring device according to a fourth embodiment of the present invention.

[Explanation of symbols]

1A 1B Base 1a Mounting hole 1b Lighting hole 3 Fixing member 3a Central hole 5 First rotating member 5a Central hole 7 Second rotating member 7a Central hole 9 Fixing member 11 Lens holder (suction rotating means) 11a Central hole 13 Suction pipe 15 Vacuum device 17 Light transmitting device for adjustment (light transmitting device for adjustment) 19 Case 19a 19b Hole 21 Light source 23 Sensor for adjustment (light receiving device for adjustment) 25 27 Total reflection prism 29 Light transmitting device for confirmation (light transmitting device for confirmation) 31 case 31a 31b hole 33 light source 35 confirmation sensor (confirmation light receiving means) 37 adjustment light transmitter (adjustment light transmitter) 39 case 39a 39b hole 40 measurement light transmitter (measurement light transmitter) 41 adjustment Sensor (adjustment light receiving means) 43 measurement sensor (measurement light receiving means) A1 central axis (rotation axis) G glass plate L1 L2 L3 aspherical lens L1a L 2a L3a Outer peripheral surface L4 L5 L6 L7 L8 L9 L10 L11
L12 lens M reflecting mirror Oo Os center of curvature P1 P2 P3 P4 prism r1 r4 spherical surface r2 r3 r5 r6 aspherical surface S1 first contact sensor (outer diameter shake detecting means) S1a contactor S2 second contact sensor (surface shake detecting means) ) S2a contactor

Claims (8)

[Claims] 1. A suction rotation means for rotating an aspherical lens under test having a circular outer shape and a spherical surface on one side in a state where the spherical surface is suctioned, and a center of curvature of the spherical surface on a rotation axis of the suction rotation means. The adjusting light sending means for irradiating light toward the central portion of the aspherical surface of the aspherical lens, and the light emitted from the adjusting light sending means and reflected by the aspherical surface. Based on the light receiving position for adjustment capable of recognizing the light receiving position and the light receiving position of the reflected light by the light receiving position for adjustment,
An adjusting discriminating means for discriminating whether or not the center of curvature of the central portion of the aspherical surface is located on the rotation axis of the suction rotating means, and the adjusting discriminating means comprises a center of curvature of the central portion of the aspherical surface. The outer diameter deviation detecting means for contacting the outer peripheral surface of the aspherical lens to detect the outer diameter deviation amount of the outer peripheral surface in a state where it is determined that the position is on the rotation axis, In the state in which the usage determining means determines that the center of curvature of the central portion of the aspherical surface is located on the rotation axis,
An apparatus for measuring an aspherical lens, comprising: a surface wobbling detecting means that is in contact with a peripheral part of the aspherical surface and detects a surface wobbling amount of the peripheral part. 2. The aspherical lens measuring device according to claim 1, wherein a shape of a contact portion of the suction rotation means with the spherical surface is circular in a plan view and orthogonal to the rotation axis in a side view. In addition, the confirmation light-transmitting means for irradiating light toward the spherical surface of the aspherical lens, and the light emitted from the confirmation light-transmitting means and reflected by the spherical surface are received, and from the light receiving position, An aspherical lens measuring device comprising: a confirmation determining unit that determines whether or not the center of curvature of the spherical surface is on the rotation axis of the suction rotating unit. 3. A suction rotation means for rotating an aspherical lens under test having a circular outer shape and a spherical surface on one side in a state in which the aspherical surface is suctioned, and an adjusting light sending device for irradiating light to the spherical surface. A light receiving position for recognizing the light receiving position, which receives the light emitted from the adjusting light transmitting unit and reflected by the spherical surface, and the light receiving position of the reflected light by the adjusting light receiving unit.
The adjusting discriminating means for discriminating whether or not the center of curvature of the spherical surface is located on the rotation axis of the suction rotating means, and the adjusting discriminating means is such that the center of curvature of the spherical surface is located on the rotating shaft. In the state in which it is determined that the spherical surface is in contact with the outer peripheral surface of the aspherical lens, the outer diameter deflection detecting means for detecting the outer diameter deflection amount of the outer peripheral surface, and the adjustment determining means are In a state where it is determined that the center of curvature is located on the rotation axis, a light-transmitting means for measurement that irradiates light toward the central portion of the aspherical surface, and a light-emitting means for measurement that emits light. Based on the measurement light receiving means for receiving the light reflected by the aspherical surface and recognizing the light receiving position, and the light receiving position of the reflected light by the measurement light receiving means,
A curvature center shake amount calculating means for calculating a curvature center shake amount of the central portion of the aspherical surface with respect to the rotation axis, and an aspherical lens measuring device. 4. A suction rotation means for rotating an aspherical lens under test, the outer shape of which is circular and both surfaces of which are aspherical surfaces, in the state in which one of the aspherical surfaces is attracted, and the centering portion of the other aspherical surface. Adjusting light transmitting means for irradiating light, and an adjusting light receiving means for receiving light emitted from the adjusting light transmitting means and reflected by the other aspherical surface, the light receiving position being recognizable, and the adjusting light transmitting means. Based on the light receiving position of the reflected light by the light receiving means,
An adjusting discriminating means for discriminating whether or not the center of curvature of the central portion of the other aspherical surface is located on the rotation axis of the suction rotating means; Outer diameter deviation detecting means for detecting the outer diameter deviation of the outer peripheral surface by contacting the outer peripheral surface of the aspherical lens in a state where it is determined that the center of curvature of the portion is located on the rotation axis. When the adjustment determining means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotational axis, the adjustment determining means contacts the peripheral portion of the other aspherical surface. The surface wobbling detecting means for detecting the amount of surface wobbling in the peripheral portion and the adjusting discriminating means determine that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis. In this state, a measuring light-transmitting means for irradiating light toward the central portion of the one aspherical surface, and the measuring light-transmitting means. On the basis of the measurement light-receiving means capable of recognizing the light-receiving position, which receives the light emitted from the light-transmitting means and reflected by the one aspherical surface, and the light-receiving position of the reflected light by the measurement light-receiving means,
A curvature center shake amount calculating means for calculating a curvature center shake amount of a central portion of the one aspherical surface with respect to the rotation axis, and an aspherical lens measuring device. 5. A step of adsorbing and rotating the spherical surface of an aspherical lens to be tested, which has a circular outer shape and one surface of which is a spherical surface, wherein the center of curvature of the spherical surface is on the rotation axis of the adsorbing and rotating means. Irradiating light toward the central portion of the aspherical surface of the aspherical lens in a state of being positioned, the light reflected by the aspherical surface, based on the light receiving position, the center of curvature of the central portion of the aspherical surface. The step of causing the adjustment determining means to determine whether or not is located on the rotation axis of the suction rotation means, the adjustment determination means is such that the center of curvature of the central portion of the aspherical surface is on the rotation axis. In a state where it is determined that the aspherical lens is positioned, a step of detecting an outer diameter deflection amount of the outer peripheral surface of the aspherical lens, and the adjusting determination means is such that the center of curvature of the central portion of the aspherical surface is the rotation axis Is determined to be located above The method for measuring an aspherical lens, comprising the step of detecting the amount of surface runout of the peripheral portion of the aspherical surface in the state of being in the open state. 6. The method for measuring an aspherical lens according to claim 5, wherein a shape of a contact portion of the suction rotation means with the spherical surface is circular in a plan view and orthogonal to the rotation axis in a side view. Further, after the center of curvature of the spherical surface is positioned on the rotation axis of the suction rotation means, the step of irradiating light toward the spherical surface of the aspherical lens, the light reflected by the spherical surface is received. Based on position
A method for measuring an aspherical lens, which has a step of causing a confirmation discriminating means for discriminating whether or not the center of curvature of the spherical surface is on the rotation axis of the suction rotating means. 7. A step of adsorbing an aspherical surface of an aspherical lens to be inspected having a circular outer shape and a spherical surface on one side to an adsorbing and rotating means, rotating the aspherical surface, irradiating light toward the spherical surface, and reflecting by the spherical surface. Based on the received light position,
A step of causing an adjustment determination means for determining whether or not the curvature center of the spherical surface is located on the rotation axis of the suction rotation means, wherein the adjustment determination means is such that the curvature center of the spherical surface is on the rotation axis The step of detecting the outer diameter deviation of the outer peripheral surface of the aspherical lens in the state where it is determined that the spherical surface is located at the center of curvature of the spherical surface on the rotation axis. Irradiating light toward the central portion of the aspherical surface in a state where it is determined that the light is reflected, the step of causing the measurement light receiving means that can recognize the light receiving position to receive the light reflected by the aspherical surface, and A method of measuring an aspherical lens, comprising a step of calculating a curvature center shake amount of a central portion of the aspherical surface with respect to the rotation axis based on a light receiving position of reflected light by the measuring light receiving means. 8. A step of adsorbing and rotating one aspherical surface of an aspherical lens to be inspected, which has an outer shape of a circle and whose both surfaces are aspherical surfaces, by adsorbing and rotating the one aspherical surface on the other aspherical surface. The step of irradiating, the light reflected by the other aspherical surface is checked based on the light receiving position to determine whether the center of curvature of the other aspherical surface is located on the rotation axis of the suction rotation means. A step of causing the adjusting discriminating means for discriminating to receive light, in a state where the adjusting discriminating means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, A step of detecting an outer diameter deflection amount of the outer peripheral surface of the lens, in a state where the adjustment determining means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, The amount of surface runout around the other aspherical surface is detected. In the state where the adjustment determining means determines that the center of curvature of the central portion of the other aspherical surface is located on the rotation axis, the adjustment determining means is directed toward the central portion of the one aspherical surface. Based on the step of irradiating light, the step of causing the measurement light receiving means capable of recognizing the light reception position to receive the light reflected by the one aspherical surface, and the light reception position of the reflected light by the measurement light receiving means, A method of measuring an aspherical lens, comprising a step of calculating a center-of-curvature deflection amount of a central portion of the one aspherical surface with respect to a rotation axis.