JP2004243510A - Centering apparatus and centering method of optical lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the centering apparatus and the centering method of an optical lens by which centering is made so as to lessen the amount of decenter, and also the centering is made even though it is a tilt aspheric lens. <P>SOLUTION: The centering apparatus of this optical lens is provided with: a suction rotating means used to rotate one side of a worked lens comprising the optical faces of two faces to the circumference of a designated rotary shaft in a sucked condition; an inside curvature center position distinguishing means for distinguishing whether the center of curvature against the vicinity of the center portion in the optical face sucked by the suction rotating means is positioned on the above rotary shaft or not; an outside curvature center position distinguishing means for distinguishing whether the center of the curvature against the peripheral portion of the optical face sucked by the suction rotating means is positioned on the above rotary shaft or not; a securing means for making the above worked lens against the above suction rotating means immovable; and a working means which is free in a reciprocating movement in the disjunctive direction to the above rotary shaft and which can be used for cutting the outer circumferential face of the above worked lens. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a centering apparatus and a centering method for an optical lens that can reduce the amount of decentering of an aspherical lens and can center even a tilted aspherical lens.

  An aspherical lens having at least one aspherical surface has an aspherical tilt (a straight line connecting the centers of curvature at respective positions of the aspherical surface) when incorporated near the stop in the lens system when the amount of aspherical surface becomes large. From the inclination of the spherical axis and the center axis of the outer diameter), the magnitude of the decenter amount (the radial distance between the vertex of the aspheric surface (the intersection of the aspheric axis and the aspheric surface) and the center of the outer diameter) is In many cases, it greatly affects the aberration degradation of the entire lens system.

  However, in the past, since the aspherical axis was assumed from the center of curvature for a certain part of the aspherical surface, an uncertain portion remains in the processing standard, and for example, the center of curvature of the inside and outside of the aspherical lens is With an aspherical lens that changes greatly, it was not possible to reduce the decenter amount with respect to the true aspherical axis.

  Also, a tilted aspheric lens in which at least one surface forms an aspheric surface and the other surface is inclined with respect to the aspheric surface (when the other surface is a spherical surface, the center of curvature is located on the aspherical axis of the aspherical surface. If the other surface is aspherical, the lens is designed so that the aspherical axes of both surfaces are inclined with respect to each other.) .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a centering apparatus and a centering method for an optical lens, which can perform centering so as to reduce the amount of decentering and can center even a tilted aspheric lens. .

  An optical lens centering device according to the present invention includes: a suction rotating unit that rotates around a predetermined rotation axis while adsorbing one surface of a lens to be processed including two optical surfaces; and an optical device that is sucked by the suction rotating unit. Inner curvature center position determining means for determining whether or not the center of curvature with respect to the vicinity of the center of the surface is located on the rotation axis; and the center of curvature with respect to the peripheral portion of the optical surface sucked by the suction rotating means rotates the center of curvature. Outer curvature center position discriminating means for discriminating whether or not the lens is positioned on the axis, fixing means for immobilizing the lens to be processed with respect to the suction rotating means, and reciprocally movable in a direction away from and contacting the rotating shaft. And processing means for shaving the outer peripheral surface of the lens to be processed.

  The fixing means may be a state in which the inner curvature center position determining means and the outer curvature center position determining means determine that the center of curvature of the optical surface near the center and the periphery is located on the rotation axis. It is practical that the lens to be processed is immovable with respect to the suction rotating means.

  The outer-curvature-center-position determining unit is a first surface runout detecting unit that detects a surface runout amount of a peripheral portion of the optical surface by contacting the peripheral portion of the optical surface sucked by the suction rotating unit. Is preferred.

  The inner curvature center position determining means contacts the vicinity of the central portion of the optical surface sucked by the suction rotating means, thereby detecting a surface shake amount near the center of the optical surface. It is preferred that

  Further, a light transmitting means for confirmation for irradiating light near the center of the optical surface sucked by the suction rotating means, and a light emitted from the light transmitting means for confirmation substantially perpendicular to the vicinity of the center of the optical surface. Incident, receives the light reflected by the optical surface, and from the light receiving position, a determination unit for checking whether the center of curvature of the center of the optical surface is located on the rotation axis, It is preferable to provide

  The inner curvature center position determining means is a first adjusting light transmitting means for irradiating light near a central portion of the optical surface sucked by the suction rotating means, and the adjusting light transmitting means emits the light. A first light that is incident on the optical surface substantially perpendicularly, receives light reflected by the optical surface, and determines from the light receiving position whether or not the center of curvature near the central portion is located on the rotation axis. It is also possible to provide an adjustment determining means.

  A second adjusting light transmitting means for irradiating the outer curvature center position determining means with light toward a peripheral portion of the optical surface sucked by the suction rotating means; and a second adjusting light transmitting means. And is incident on the optical surface substantially perpendicularly, receives light reflected by the optical surface, and determines whether or not the center of curvature of the peripheral portion is located on the rotation axis from the light receiving position. It is also possible to provide a second adjustment determining means.

  Further, a center-curvature-measured-quantity-measuring light transmitting unit that irradiates light toward the optical surface opposite to the optical surface adsorbed, and the opposite-side emitted from the center-curvature-measured-quantity measuring light transmitting unit. Light incident substantially perpendicularly to the optical surface and receiving light reflected by the optical surface, a light receiving means for measuring the center vibration amount of curvature capable of recognizing a light receiving position, and a light reflected by the light receiving means for measuring the center vibration amount of curvature. It is preferable to include a curvature center shake amount calculating means for calculating the center shake amount of the opposite optical surface based on the light receiving position.

  Further, light is transmitted from the center-curvature-measurement-quantity-measuring light-transmitting unit that emits light toward the vicinity of the center of the optical surface opposite to the optical surface adsorbed, and emitted from the curvature-center-measurement-measurement light-transmitting unit. A light receiving means for measuring the center deflection of the center of curvature, which is incident substantially perpendicularly near the center of the optical surface on the opposite side and receives the light reflected by the optical surface, and capable of recognizing a light receiving position; Based on the light receiving position of the reflected light by the measuring light receiving means, the center of curvature calculating means for calculating the center of curvature of the center of the optical surface on the opposite side with respect to the rotation axis of the suction rotating means, It is preferable that the apparatus further comprises: third surface runout detecting means for coming into contact with a peripheral portion of the optical surface and detecting a surface runout amount of the peripheral portion.

  The fixing means can be, for example, an adhesive.

  A centering method for an optical lens according to the present invention includes a rotating step of adsorbing and rotating one side of a lens to be processed composed of two optical surfaces by an adsorbing rotating unit, near a central portion of the optical surface adsorbed by the adsorbing rotating unit. A center of curvature for determining whether or not the center of curvature with respect to the rotation axis of the suction rotation means is located on the rotation axis of the suction rotation means; An outer curvature center position determining step of determining whether or not the lens is positioned above, and the suction rotation of the lens to be processed so that the center of curvature with respect to the central portion and the peripheral portion of the optical surface is positioned on the rotation axis. A position adjusting step of adjusting the position and orientation with respect to the means, and a state in which the center of curvature of the optical surface near the center and around the periphery is determined to be located on the rotation axis; A fixing step of making the lens to be processed immovable with respect to the suction rotating means, and a processing means capable of reciprocatingly moving in a direction away from and coming into contact with the rotation axis, by contacting an outer peripheral surface of the lens to be processed, A machining step of shaving the surface.

  The outer curvature center position determining step includes detecting a surface runout amount in a peripheral portion of the optical surface by bringing the first surface runout detecting device into contact with a peripheral portion of the optical surface sucked by the suction rotating device. It is practical to be a step.

  The inner curvature center position determining step includes contacting the second surface runout detecting unit with the vicinity of the central portion of the optical surface sucked by the suction rotating unit to reduce the amount of surface runout near the central portion of the optical surface. It can be a detecting step.

  Further, the step of irradiating light toward the vicinity of the center of the optical surface sucked by the suction rotating means, and light incident substantially perpendicularly near the center of the optical surface, and reflected by the optical surface, It is preferable that the method further comprises a step of receiving light from a light receiving position by a confirmation determining means for determining whether or not a center of curvature of a central portion of the optical surface is located on the rotation axis.

  The step of determining the center position of the inner curvature center is a step of irradiating light toward a central portion of the optical surface sucked by the suction rotating means; Receiving light reflected by the first adjusting means for determining whether the center of curvature near the center of the optical surface is located on the rotation axis from the light receiving position. May be provided.

  The outer curvature center position determining step is a step of irradiating light toward a peripheral portion of the optical surface sucked by the suction rotating means; and the light is incident on the peripheral portion of the optical surface substantially perpendicularly and reflected by the optical surface. Receiving the received light, and causing the second adjustment determining means for determining whether the center of curvature of the peripheral portion of the optical surface is located on the rotation axis from the light receiving position. It is also possible.

  Further, after the step of adjusting the position, the step of irradiating light toward the optical surface opposite to the sucked optical surface, the light is incident on the opposite optical surface substantially perpendicularly, and is reflected by the optical surface. Receiving the reflected light by the curvature center shake amount measuring light receiving means capable of recognizing the light receiving position, and based on the light receiving position of the reflected light by the curvature center shake amount measuring light receiving means, based on the light receiving position of the opposite optical surface. Calculating a curvature center shake amount.

  Irradiating light near the center of the optical surface opposite to the optical surface adsorbed after the position adjusting step; and substantially perpendicularly entering near the center of the optical surface on the opposite side. Receiving the light reflected by the optical surface by the center-curvature-measurement-quantity light-receiving unit capable of recognizing the light-receiving position, based on the light-receiving position of the reflected light by the center-curvature-measurement-quantity light-receiving unit. Calculating a center deflection amount near the center of the optical surface on the opposite side with respect to the rotation axis of the suction rotating means, and, after the position adjusting step, a third surface deflection on a peripheral portion of the opposite optical surface. Detecting the surface runout amount of the peripheral portion by contacting the detection means.

  It is practical that the fixing step is a step of fixing the lens to be processed to the suction rotating means with an adhesive.

  According to the present invention, the centering can be performed so as to reduce the decenter amount, and the centering can be performed even with a tilted aspheric lens.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

  In this embodiment, an aspheric lens (worked lens) L1 having one surface forming an aspheric surface r1 and the other surface forming a spherical surface r2 is centered such that the decenter amount of the aspheric surface r1 becomes zero. It is.

  Here, the decenter amount of the aspherical surface r1 is the intersection of the aspherical axis of the aspherical surface r1 (a straight line connecting the centers of curvature O2o and O2as at respective positions of the aspherical surface r1; see FIG. 1) A1 and the aspherical surface r1. It is defined as a radial distance between the vertex P of the aspheric surface r1 and the center of the outer diameter (not shown) of the aspheric lens L1. Further, the decentering amount of zero means not only that the decentering amount is strictly zero, but also that the decentering amount is slightly larger than zero (also in the second to ninth embodiments). The same is true).

  First, the configuration of the centering device for the aspheric lens L1 of the present embodiment will be described.

  A mounting hole 1a is formed in the upper surface of the hollow box-shaped base 1A. Inside the base 1, a fixing member 3A having a central hole 3a extending in the vertical direction and having a closed bottom is provided. A substantially cylindrical first rotating member 5 linked to a motor (not shown) is rotatably fitted to the upper part of the fixed member 3A around a vertical axis via a bearing. The upper part of the first rotating member 5 protrudes above the base 1 from the mounting hole 1a, and the first rotating member 5 is provided with a center hole 5a concentric with and communicating with the center 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 center hole 7 a concentric with and communicating with the center hole 5 a. 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 1.

  On the upper surface of the second rotating member 7, a substantially cylindrical lens holder (suction rotating means) 11A, which supports the vicinity of the center of the aspherical surface r1 of the aspherical lens L1 and has an open upper surface, is fixed. A center hole 11a is formed in the holder 11A so as to be concentric with and communicate with the center hole 7a.

  A vacuum device 15 communicating with the center hole 3a of the fixing member 3A via a suction pipe 13 is provided on a bottom surface inside the base 1. The vacuum device 15 sucks the aspherical lens L1, which is the lens to be processed, mounted on the upper surface of the lens holder 11A to the lens holder 11A by evacuating the center holes 3a, 5a, 7a, 11a. Is what you do.

  In the vicinity of the lens holder 11A, an oscillating first contact sensor (outside curvature) that comes into contact with the periphery and the vicinity of the center of the aspherical surface r1 of the aspherical lens L1 adsorbed on the upper surface of the lens holder 11A, respectively. A center position determining means) (first surface runout detecting means) S1 and a second contact sensor (inner curvature center position determining means) (second surface runout detecting means) S2 are provided. These contact sensors S1 and S2 are provided to a processor (outside curvature center position determination unit) (inner curvature center position determination unit) (first surface runout detection unit) (second surface runout detection unit) not shown. The processor is connected to a television monitor (not shown).

  A disk-shaped rotary grinding tool having a rotation axis C1 parallel to the center axis (rotation axis) A2 of each of the center holes 3a, 5a, 7a, 11a is provided at a position laterally of the lens holder 11A and slightly higher than the lens holder 11A. (Processing means) C is provided. The rotary grinding tool C is located at a stop position (the position in FIG. 1) separated from the aspherical lens L1 when a switch (not shown) is OFF, and is omitted when the switch is turned ON. A contact position where the outer peripheral surface C2 contacts the outer peripheral surface L1a of the aspherical lens L1 while linearly moving toward the central axis A1 while rotating around the rotation axis C1 under the driving force of the motor (illustrated in FIG. (Omitted). Further, when the switch is turned off thereafter, the rotary grinding tool C stops rotating and linearly moves toward the stop position.

  Next, a method of centering the aspheric lens L1 using such a centering device will be described.

  After the aspherical lens L1 machined so that the aspherical surface r1 has an accurate aspherical shape is placed on the upper surface of the lens holder 11A, the vacuum device 15 is operated to operate the central holes 3a, 5a, 7a, and 11a. Is brought into a vacuum state, and the aspherical surface r1 of the aspherical lens L1 is attracted to the lens holder 11A.

  In this state, the motor is operated to rotate the first rotating member 5, the second rotating member 7, the lens holder 11A, and the aspheric lens L1 around the central axis A2 of each of the center holes 3a, 5a, 7a, 11a.

  At this time, if the centers of curvature O2o and O2as in the vicinity of the center and the periphery of the aspheric surface r1 are not located on the center axis A2, the contacts S1a and S2a of the first and second contact sensors S1 and S2 will not be formed. The processor swings up and down, and the processor calculates the swing amount (surface shake amount), and the calculated swing amount is displayed on a television monitor.

  When the position and direction of the aspherical lens L1 with respect to the lens holder 11A are changed so that the swing amounts of the contacts S1a and S2a of the first and second contact sensors S1 and S2 become zero, and the swing amount becomes zero. , The aspheric lens L1 is held in that state. By adjusting the position and orientation of the aspheric lens L1 in this manner, the centers of curvature O2o and O2as are located on the center axis A2, and the aspheric axis A1 and the center axis A2 coincide.

  Here, the swing amount of the contacts S1a and S2a is zero when the contacts S1a and S2a are completely stationary and the contact S1a slightly swings within a predetermined allowable range. This also includes the state in which it is present (the same applies to the second to ninth embodiments).

  When the aspherical axis A1 and the central axis A2 coincide in this way, an adhesive (fixing means) S is applied to the contact portion between the lens holder 11A and the aspherical lens L1 to fix the aspherical lens L1 to the lens holder 11A. Then, the aspheric lens L1 is brought into an immobile state.

  When the aspheric lens L1 is completely fixed to the lens holder 11A, the switch is turned ON, and the rotary grinding tool C at the stop position is moved to the contact position while rotating, and the outer peripheral surface C2 of the rotary grinding tool C is moved. The entire outer peripheral surface L1a of the aspherical lens L1 is cut by contacting the outer peripheral surface L1a of the aspherical lens L1. When the entire outer peripheral surface L1a of the aspheric lens L1 has been cut, the switch is turned off and the rotary grinding tool C is returned to the stop position.

  Finally, the lens holder 11A is removed from the second rotating member 7, and the adhesive S is dissolved by dipping in a solvent (not shown), and the aspheric lens L1 is removed from the lens holder 11A. Note that depending on the type of the adhesive S, the lens holder 11A may be heated to melt the adhesive S.

  When the entire outer peripheral surface L1a of the aspheric lens L1 is cut in this way, the center of the outer diameter of the aspheric lens L1 is positioned on the aspheric axis A1, and the decenter amount becomes zero. The aspherical lens L1 thus processed hardly affects the aberration deterioration of the entire lens system even if it is incorporated in the lens system (especially near the stop).

  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 denoted by the same reference numerals, and detailed description thereof is omitted.

  Also in this embodiment, an aspheric lens L1 having one surface forming an aspheric surface r1 and the other surface forming a spherical surface r2 is centered such that the decenter amount of the aspheric surface r1 becomes zero.

  First, components that are not included in the first embodiment of the centering device for the aspheric lens L1 of the present embodiment will be described.

  The base 1B is wider than that of the first embodiment, and a lighting hole 1b is formed on the upper surface thereof in addition to the mounting hole 1a. On the bottom surface inside the base 1B, a pair of left and right total reflection prisms 17 and 19 respectively located right below the mounting hole 1a and the lighting hole 1b are installed. The bottom of the fixing member 3B is open, and a transparent cover glass G is provided in this opening.

  A light transmitting device for confirmation (confirming light transmitting means) 21 is disposed above the lighting hole 1b.

  The confirmation light transmission device 21 includes a case 23 having a hole 23a formed in the lower surface, a light source 25 disposed inside the case 23, a mirror M1, a prism P1, and three lenses L2 and L3. , L4 and a confirmation sensor (confirmation determination means) 27.

  The confirmation sensor 27 is connected to the processor (confirmation determination means).

  Next, a method of centering the aspheric lens L1 using such a centering device will be described.

  After the aspheric lens L1 is placed on the upper surface of the lens holder 11A and sucked, the motor is operated to move the first rotating member 5, the second rotating member 7, the lens holder 11A, and the aspheric lens L1 around the central axis A2. When the rotation of the contacts S1a and S2a of the first and second contact sensors S1 and S2 is reduced to zero, the aspheric lens L1 is held in that state, and the aspheric axis A1 and the central axis A2 are held. Are the same as in the first embodiment.

  When the swing amounts of the contacts S1a and S2a become zero, it is confirmed whether or not the center of curvature O2o near the center of the aspheric surface r1 is located on the center axis A2 in the following manner.

  When light is emitted from the light source 25, the light is reflected by the mirror M1 of the light transmitting device 21 for confirmation, then passes through the lens L2, the prism P1, the lens L3, and the lens L4, and is reflected by the total reflection prisms 19 and 17. Then, the light passes through the cover glass G and is substantially perpendicularly incident near the center of the aspherical surface r1. Then, the light reflected by the vicinity of the central portion of the aspherical surface r1 is reflected by the total reflection prisms 17 and 19, goes to the inside of the light transmitting device 21 for confirmation, passes through the lenses L4 and L3, and changes its direction by the prism P1. The processor is changed and guided to the confirmation sensor 27, and the processor determines whether or not the light is received at the reference position of the confirmation sensor 27. As described above, the state in which “light is incident substantially perpendicularly near the center of the aspherical surface r1 and reflected” is such that the focal point of the light beam emitted from the light source 25 is close to the center of the aspherical surface r1. By setting the centering device so as to coincide with the position of the center of curvature (O2o).

  If the light is received at the reference position, the fact that the center of curvature O2o is located on the center axis A2 is displayed on the television monitor. If the light is received at a place other than the reference position, the center of curvature O2o is detected. It is displayed that it is not located on the center axis A2.

  When it is confirmed that the center of curvature O2o is located on the central axis A2 in this manner, an adhesive S is applied to a contact portion between the lens holder 11A and the aspherical lens L1, and the aspherical lens L1 is attached to the lens holder. 11A, the outer peripheral surface L1a of the aspheric lens L1 is entirely shaved by the rotary grinding tool C, the decenter amount of the aspheric lens L1 is reduced to zero, and then the aspheric lens L1 is removed from the lens holder 11A.

  According to this embodiment, when the aspheric lens L1 is centered, it can be easily visually confirmed that the center of curvature O2o is located on the central axis A2. Centering can be performed 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 denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, an aspheric lens L1 having one surface forming an aspheric surface r1 and the other surface forming a spherical surface r2 is centered such that the decenter amount of the aspheric surface r1 becomes zero, and the spherical surface r2 is formed. Is to measure the amount of deflection of the center of curvature.

  Here, the amount of deflection of the center of curvature of the spherical surface r2 is defined as a distance between the aspherical axis A1 and the center of curvature O1o of the spherical surface r2 in the radial direction of the aspherical lens L1.

  First, components of the centering device for the aspheric lens L1 according to the present embodiment that are not included in the second embodiment will be described.

  A prism P2 is provided inside the confirmation light transmitting device 21 of this embodiment instead of the mirror M1.

  Above the lens holder 11A, a light transmitting device 29 for measuring the center fluctuation of the curvature (light transmitting means for measuring the center fluctuation of the curvature) is provided. The light transmitting device 29 for measuring the amount of deflection of the center of curvature includes a case 31 having holes 31a and 31b formed on the lower surface and side surfaces, a mirror M2 disposed inside the case 31, a prism P3, and three plates. , Lenses L5, L6, and L7, and a curvature center shake amount measurement sensor (curvature center shake amount measurement light receiving unit) 33. The curvature center shake amount measuring sensor 33 is connected to the processor (curvature center shake amount calculation means).

  Above the lighting hole 1b, the structure is substantially the same as that of the light transmitting device 21 for confirmation, but a prism P2 is provided instead of the mirror M1 and a hole 23b is formed in the case 23 for confirmation. A light transmitting device 21A is provided.

  The procedure for matching the aspherical axis A1 with the rotation axis A2, the procedure for confirming that the aspherical axis A1 and the rotation axis A2 match, and the procedure for shaving the outer peripheral surface L1a of the aspherical lens L1 by this centering device are as follows. The second embodiment is the same as the second embodiment except that a part of the light emitted from the light source 25 is changed in direction by the prism P2 and passes through the lens L2, the prism P1, and the like. different).

  The amount of deflection of the center of curvature of the spherical surface r2 is measured in the following manner.

  When the light source (curvature center shake amount measuring light transmitting means) 25 emits light, a part of the light passes through the prism P2 and is guided to the inside of the case 31 through the holes 23b and 31b (the remaining light is The light passes through the prism P1 toward the lens L2), is reflected by the mirror M2, passes through the lens L5, the prism P3, the lens L6, and the lens L7, and is incident on the spherical surface r2 substantially perpendicularly. The light incident on the spherical surface r2 is reflected by the spherical surface r2, passes through the two lenses L7 and L6, is changed in direction by the prism P3, and is guided to the curvature center shake amount measuring sensor 33. As described above, the state in which “light is incident on the spherical surface r2 almost perpendicularly and reflected” is such that the focal point of the light beam emitted from the light source 25 coincides with the position of the center of curvature (O1o) of the spherical surface r2. In this way, it can be constructed by setting the centering device.

  The processor calculates the amount of center deflection of the spherical surface r2 in accordance with the position on the light receiving surface of the sensor 33 for measuring the amount of center deflection of the curvature, and displays the result on a television monitor. If the light is received at the reference position on the light-receiving surface, the TV monitor displays that the center deflection of the curvature is zero, and if the light is received at a position other than the reference position, the center deflection of the curvature is displayed numerically. Is done.

  Then, after measuring the amount of deflection of the center of curvature of a large number of aspherical lenses in this way, examining the lens performance of these aspherical lenses, and examining the correlation between the amount of deflection of the center of curvature and the lens performance, the center of curvature is determined. It is possible to know how the shake amount affects the lens performance.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  The same members as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, centering is performed so that the decenter amount of the aspherical surface r1 of the aspherical lens (workpiece lens) L8 having two aspheric surfaces is zero, and the center fluctuation of the curvature near the center of the aspherical surface r3 is performed. The method for measuring the amount and the amount of surface runout in the peripheral portion is as follows. How to match the aspherical axis A1 of the aspherical surface r1 with the central axis A2 using the first and second contact sensors S1 and S2, The procedure for confirming that the aspheric axis A1 and the central axis A2 match and the procedure for centering the aspheric lens L8 are the same as those in the third embodiment. Accordingly, these points and detailed description of the same members as those in the third embodiment are omitted, and the members not in the third embodiment and the curvature center shake amount near the center of the aspherical surface r3 of the aspherical lens L8 are omitted. And the procedure for measuring the amount of surface runout in the peripheral portion will be described in detail.

  Note that Ot in the figure is the center of curvature near the center of the aspherical surface r3.

  Above the first contact-type sensor S1, a third contact-type sensor (third surface runout detecting means) S3 is provided, in which the contact S3a swings freely around the periphery of the aspherical surface r3 on the front surface side. The third contact sensor S3 is connected to the processor (third runout detecting means).

  In order to measure the center fluctuation amount of the curvature near the center of the aspherical surface r3 of the aspherical lens L8, first, the light emitted from the light source 25 is transmitted through the light transmitting device 29 for measuring the center fluctuation amount of the center of the aspherical surface r3. The light is substantially perpendicularly incident near the portion, and the light reflected by the aspheric surface r3 is guided to the curvature center shake amount measurement sensor 33. If the light is received at the reference position of the curvature center shake amount measuring sensor 33, the television monitor displays that the curvature center shake amount is zero, and if the light is received at a position other than the reference position, the TV monitor The numerical value of the amount of deflection of the center of curvature is displayed, and this is confirmed.

  Further, the amount of surface runout around the aspherical surface r3 calculated by the processor based on the swing amount of the contact S3a of the third contact sensor S3 is confirmed on a television monitor.

  After measuring the amount of center deflection of the curvature and the amount of surface deflection of many aspherical lenses in this way, the lens performance of these aspherical lenses is examined, and the correlation between the amount of center deflection of the curvature and the amount of surface deflection and the lens performance is determined. By investigating, it is possible to know how each of the curvature center shake amount and the surface shake amount affects the lens performance.

  Next, a fifth embodiment of the present invention will be described with reference to FIG.

  The same members as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, an aspheric lens L1 whose one surface forms an aspheric surface r1 and the other surface forms a spherical surface r2 is centered such that the decenter amount of the aspheric surface r1 becomes zero.

  A third rotating member 8a having a center hole 8a1 formed concentrically with the center hole 7a is fixed to a concave portion 7b formed on the upper surface of the second rotating member 7; A fourth rotating member 8b having a center hole 8b1 formed concentrically with the center holes 7a and 8a1 is fixed to the upper surface of the rotating member 8a. A substantially cylindrical lens holder (adsorption rotating means) 11B, which supports the inner surface of the aspherical lens L1 slightly inward from the peripheral portion of the aspherical surface r1 and has an open upper surface, is fixed to the upper surface of the fourth rotating member 8b. In addition, a center hole 11b which is concentric with the center hole 7a and communicates with the center hole 8b1 is formed inside the lens holder 11B.

  A light transmitting device for adjustment (first light transmitting means for adjustment) 35 having substantially the same components as the light transmitting device for confirmation 21 is provided directly above the light collecting hole 1b. An adjusting sensor (first adjusting determining means, inner curvature center position determining means) 37 is provided inside the adjusting light transmitting device 35 instead of the confirmation sensor 27.

  Further, the centering device of the present embodiment is not provided with the second contact sensor S2.

  Next, a centering procedure using this centering device will be described.

  After placing the aspheric lens L1 on the upper surface of the lens holder 11B, the vacuum device 15 is operated to evacuate each of the central holes 3a, 5a, 7a, 8a1, 8b1, and 11b, and the aspheric surface of the aspheric lens L1 is set. r1 is adsorbed to the lens holder 11B.

  In this state, the motor is operated to rotate the first rotating member 5, the second rotating member 7, the third rotating member 8a, the fourth rotating member 8b, the lens holder 11B, and the aspheric lens L1 around the central axis A2.

  When light is emitted from the light source 25, the light is reflected by the mirror M1 in the adjusting light transmitting device 35, transmitted through the lens L2, the prism P2, the lens L3, and the lens L4, and then reflected by the total reflection prisms 19 and 17. , Approximately perpendicularly near the center of the aspherical surface r1. Then, the light reflected by the aspherical surface r1 is guided to the inside of the adjusting light transmitting device 35 by the total reflection prisms 17 and 19, passes through the lenses L4 and L3, and changes its direction by the prism P2, and is adjusted. It is led to 37.

  At this time, if the center of curvature O2o near the center of the aspheric surface r1 is not located on the central axis A2, light is received at a position other than the reference position of the adjustment sensor 37, and the center of curvature O2o is located on the central axis A2. Is received at the reference position of the adjustment sensor 37.

  Since the position of the center of curvature O2o with respect to the center axis A2 is displayed on the television monitor, the position and orientation of the aspheric lens L1 with respect to the lens holder 11B are adjusted while watching the television monitor. Then, when it is confirmed on the television monitor that light is received at the reference position of the adjustment sensor 37, the aspheric lens L1 is held in that state. By adjusting the position and orientation of the aspheric lens L1 in this manner, the center of curvature O2o is located on the central axis A2.

  Further, the direction of the aspheric lens L1 with respect to the lens holder 11B is adjusted while watching the television monitor so that the swing amount of the contact S1a of the first contact sensor S1 becomes zero, and the center of curvature O2as is set on the center axis A2. Position.

  When both the centers of curvature O2o and O2as are located on the central axis A2, the aspherical axis A1 coincides with the central axis A2.

  When the aspherical axis A1 and the central axis A2 coincide in this way, an adhesive S is applied to the contact portion between the lens holder 11B and the aspherical lens L1, and the aspherical lens L1 is fixed to the lens holder 11B, and the rotary type The entire outer peripheral surface L1a of the aspherical lens L1 is shaved by the grinding tool C to reduce the decenter amount of the aspherical surface r1 to zero, and then the aspherical lens L1 is removed from the lens holder 11B.

  According to this embodiment as well, the aspheric lens L1 can be centered so that the decenter amount of the aspheric surface r1 of the aspheric lens L1 becomes zero.

  Next, a sixth embodiment of the present invention will be described with reference to FIG.

  In this embodiment, an aspheric lens L1 in which one surface forms an aspheric surface r1 and the other surface forms a spherical surface r2 is centered such that the decenter amount of the aspheric surface r1 becomes zero, and This is for measuring the amount of deflection of the center of curvature.

  The basic configuration of the centering device of the present embodiment is almost the same as that of the third embodiment, but similarly to the fifth embodiment, instead of the confirmation light transmission device 21A, an adjustment light transmission device 35A and a small-diameter A large-diameter lens holder 11B is provided instead of the lens holder 11A.

  The procedure for centering using this centering device is the same as that of the fifth embodiment, and the procedure for measuring the amount of deflection of the center of curvature of the spherical surface r2 is the same as that of the third embodiment.

  According to the present embodiment as well, it is possible to center the decentering amount of the aspherical surface r1 of the one-sided aspherical aspherical lens L1 so as to be zero, and to easily measure the center fluctuation amount of the curvature of the spherical surface r2. it can.

  Next, a seventh embodiment of the present invention will be described with reference to FIG.

  In this embodiment, the aspherical lens L8 having two aspheric surfaces is centered such that the decenter amount of the aspheric surface r1 becomes zero, and the center fluctuation amount of the curvature near the central portion of the aspheric surface r3 and the peripheral portion are adjusted. This is for measuring the amount of surface runout.

  The basic configuration of the centering device of this embodiment is almost the same as that of the fourth embodiment, except that a light transmitting device 35A for adjustment is used instead of the light transmitting device 21 for confirmation, and a large diameter light source is used instead of the small diameter lens holder 11A. Is different in that the lens holder 11B is provided and the second contact sensor S2 is not provided.

  The centering procedure using this centering device is the same as that of the fifth embodiment (the difference is that a part of the light emitted from the light source 25 is guided to the aspheric surface r1 through the prism P2). The point of measurement of the center deflection of the curvature near the center of r3 and the surface deflection of the peripheral portion are the same as in the fourth embodiment.

  According to this embodiment as well, it is possible to center the aspherical surface r1 of the aspherical lens L1 having two aspheric surfaces so that the decenter amount of the aspherical surface r1 becomes zero, and also to determine the amount of the center fluctuation of the curvature near the center of the aspherical surface r3 and the periphery The surface runout of the part can be easily measured.

  Next, an eighth embodiment of the present invention will be described with reference to FIG.

  As shown in the drawing, the aspheric lens (workpiece lens) L9 to be centered in the present embodiment has one surface as a spherical surface r2, and the center of curvature of the spherical surface r2 is the aspherical axis A1 of the aspherical surface r1. This is a specially shaped tilt aspheric lens not located on the upper side, and its outer peripheral surface L9a has a wedge shape when viewed from the side.

  In the present embodiment, centering is performed so that the decenter amount of the aspheric surface r1 of the aspheric lens L9 becomes zero.

  The basic configuration of the centering device of the present embodiment is the same as that of the fifth embodiment, but does not include the third rotating member 8a and the fourth rotating member 8b, and the lens holder 11B is Is different in that it is directly fixed to the upper surface of the. In this embodiment as well, the aspherical surface r1 is placed on the lens holder 11B, the aspherical axis A1 is made coincident with the central axis A2 by using the adjusting light transmitting device 35, and the aspherical lens L9 is attached with the adhesive S. After being fixed to the lens holder 11B, the entire outer peripheral surface L9a of the aspherical lens L9 is ground by the rotary grinding tool C to perform centering.

  Even if the aspherical lens L9 has such a special shape, if the outer peripheral surface L9a of the aspherical lens L9 is ground with the aspherical axis A1 coincident with the central axis A2, the decenter amount becomes zero. You can keep in mind.

  Finally, a ninth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, the same aspherical lens L9 as in the eighth embodiment is centered so that the decentering amount of the aspherical surface r1 becomes zero, and the amount of curvature center fluctuation of the spherical surface r2 is measured. It is.

  The basic configuration of the centering device of the present embodiment is the same as that of the sixth embodiment. In the same manner as in the sixth embodiment, the centering to set the decenter amount to zero and the center deflection amount of the curvature of the spherical surface r2 are performed. Measurement.

  As shown in FIG. 10, a small-diameter lens holder 11C having a center hole 11c is employed in the centering devices of the eighth and ninth embodiments to make contact with the vicinity of the central portion and the peripheral portion of the aspheric surface r1. The aspherical axis A1 may be made to coincide with the central axis A2 by using the first and second contact sensors S1 and S2 (not shown in FIG. 10).

  Further, the aspheric lens L9 may be a tilt aspheric lens (not shown) having both aspheric surfaces. Here, the double-sided aspherical tilt aspherical lens is a lens of a special shape in which the aspherical axes on both sides are inclined with respect to each other, and its outer peripheral surface is wedge-shaped when viewed from the side. In this case, similarly to the fifth embodiment, the aspherical surface opposite to the aspherical surface r1 is irradiated with light and the third contact sensor S3 is brought into contact with the aspherical surface, so that the center fluctuation of the curvature near the central portion of the aspherical surface is achieved. The amount and the surface runout of the peripheral portion may be measured.

  Further, it is of course possible to center an optical lens (not shown) whose both surfaces are spherical.

  In any of the embodiments, even if the outer peripheral surface of the aspherical lens is ground, the decenter amount may not be zero due to a mechanical error or the like, but the decenter amount may be smaller than before the processing. If this is the case, it is possible to reduce the influence on the aberration deterioration of the entire lens system.

  Further, in the fifth to ninth embodiments, instead of using the first contact sensor S1, an adjustment light transmitting device that transmits light toward the peripheral part of the aspheric surface r1 of the aspheric lenses L1, L8, L9. An adjusting light transmitting device (second adjusting light transmitting means) (not shown) having the same configuration as that of the aspherical surface r1 is provided with an adjusting sensor (second adjusting determining means) therein. May be placed on the center axis A2.

1 is an overall view of a centering device according to a first embodiment of the present invention. It is an overall view of a centering device of a second embodiment of the present invention. It is an overall view of a centering device of a third embodiment of the present invention. It is an overall view of a centering device of a fourth embodiment of the present invention. It is an overall view of a centering device of a fifth embodiment of the present invention. It is an overall view of a centering device of a sixth embodiment of the present invention. It is an overall view of a centering device of a seventh embodiment of the present invention. It is the whole centering device of an 8th embodiment of the present invention. It is an overall view of a centering device of a ninth embodiment of the present invention. It is a modification of the lens holder of the centering device of the eighth and ninth embodiments.

Explanation of reference numerals

1A 1B Base 1a Mounting hole 1b Lighting hole 3A 3B Fixing member 3a Center hole 5 First rotating member 5a Center hole 7 Second rotating member 7a Center hole 9 Fixing members 11A 11B 11C Lens holder (adsorption rotating means)
11a 11b 11c Central hole 13 Suction pipe 15 Vacuum device 17 Total reflection prism 19 Total reflection prism 21 21A Light transmitting device for confirmation (light transmitting means for confirmation)
23 Case 23a 23b Hole 25 Light source (light transmitting means for measuring center deflection of curvature)
27 Confirmation sensor (confirmation means for confirmation)
29 Transmitter for measuring center deflection of curvature (sending means for measuring center deflection of curvature)
31 Case 31a 31b Hole 33 Sensor for measuring the center deflection of the curvature (light receiving means for measuring the center deflection of the curvature)
35 35A Adjusting light transmitter (first adjusting light transmitter)
37 Adjustment Sensor (First Adjustment Determination Means, Inner Curvature Center Position Determination Means)
A1 Aspherical axis A2 Central axis (rotary axis)
C Rotary grinding tool (processing means)
G Cover glass L1 Aspheric lens (worked lens)
L1a Outer peripheral surface L2 L3 L4 L5 L6 L7 Lens L8 Aspherical lens (worked lens)
L8a Outer peripheral surface L9 Aspheric lens (worked lens)
L9a Outer peripheral surface M1 Mirror M2 Mirror S Adhesive (fixing means)
O2o O2as O1o Ot Center of curvature P Vertex P1 P2 P3 Prism r1 Aspherical surface r2 Spherical surface r3 Aspherical surface S1 First contact sensor (first surface deflection detecting means) (outer curvature center position determining means)
S1a Contact S2 Second contact sensor (second surface runout detecting means) (inner curvature center position determining means)
S2a Contact S3 Third contact sensor (third runout detecting means)
S3a contact

Claims (19)

Suction rotating means for rotating around a predetermined rotation axis in a state where one surface of the lens to be processed consisting of two optical surfaces is suctioned,
Inner curvature center position determining means for determining whether the center of curvature with respect to the vicinity of the center of the optical surface sucked by the suction rotating means is positioned on the rotation axis,
Outer curvature center position determining means for determining whether the center of curvature with respect to the peripheral portion of the optical surface sucked by the suction rotating means is located on the rotation axis,
Fixing means for immobilizing the lens to be processed with respect to the suction rotating means,
A processing means which is reciprocally movable in a direction of coming and going to and away from the rotating shaft, and shaving the outer peripheral surface of the lens to be processed;
A centering device for an optical lens, comprising: 2. The centering device for an optical lens according to claim 1, wherein the fixing unit is configured such that the inner curvature center position determining unit and the outer curvature center position determining unit have a center of curvature with respect to a central portion and a peripheral portion of the optical surface, An optical lens centering device for making the lens to be processed immovable with respect to the suction rotating means when it is determined that the lens is positioned on the rotation axis. The centering device for an optical lens according to claim 1 or 2,
The outer-curvature-center-position determining unit is a first surface runout detecting unit that detects a surface runout amount of a peripheral portion of the optical surface by contacting the peripheral portion of the optical surface sucked by the suction rotating unit. Optical lens centering device. The centering device for an optical lens according to claim 3,
The inner curvature center position determining means contacts the vicinity of the central portion of the optical surface sucked by the suction rotating means, thereby detecting a surface shake amount near the center of the optical surface. Is an optical lens centering device. The centering device for an optical lens according to claim 4 further includes:
Confirmation light transmitting means for irradiating light toward the vicinity of the center of the optical surface sucked by the suction rotating means,
The light emitted from the confirmation light transmitting means is incident substantially perpendicularly near the center of the optical surface, receives light reflected by the optical surface, and from the light receiving position, the center of curvature of the center of the optical surface is Confirmation determination means for determining whether or not it is located on the rotation axis,
An optical lens centering device comprising: The centering device for an optical lens according to claim 1 or 2,
The inner curvature center position determining means is a first adjusting light transmitting means for irradiating light near a central portion of the optical surface sucked by the suction rotating means, and the adjusting light transmitting means emits the light. A first light that is incident on the optical surface substantially perpendicularly, receives light reflected by the optical surface, and determines from the light receiving position whether or not the center of curvature near the central portion is located on the rotation axis. An optical lens centering device including an adjustment determining unit. The centering device for an optical lens according to claim 6,
The outer curvature center position discriminating means includes a second adjusting light transmitting means for irradiating light to a peripheral portion of the optical surface sucked by the suction rotating means, and a light emitted from the second adjusting light transmitting means. A second light that enters the optical surface substantially perpendicularly, receives light reflected by the optical surface, and determines from the light receiving position whether or not the center of curvature of the peripheral portion is located on the rotation axis. An optical lens centering device comprising: an adjustment determining means for adjusting the optical lens. The centering device for an optical lens according to any one of claims 1 to 7, further comprising:
A light transmitting means for measuring the amount of curvature center deflection which irradiates light toward the optical surface opposite to the optical surface adsorbed,
A light emitting device for measuring the amount of curvature center fluctuation which is emitted from the light transmitting means for measuring the center fluctuation amount of the curvature and which is substantially perpendicularly incident on the optical surface on the opposite side and receives the light reflected by the optical surface. Light receiving means;
A curvature center shake amount calculating means for calculating a curvature center shake amount of the opposite optical surface based on a light receiving position of the reflected light by the curvature center shake amount measuring light receiving means;
An optical lens centering device comprising: The centering device for an optical lens according to any one of claims 1 to 7,
A light transmitting unit for measuring the amount of curvature center deflection that irradiates light toward the vicinity of the center of the optical surface opposite to the optical surface adsorbed,
A curvature center that is emitted from the curvature center deflection amount measuring light transmitting unit, is incident substantially perpendicularly near the center of the opposite optical surface, receives light reflected by the optical surface, and is capable of recognizing a light receiving position. Light receiving means for measuring the amount of shake,
A curvature center shake amount calculating means for calculating a curvature center shake amount of the center portion of the optical surface on the opposite side to the rotation axis of the suction rotating means, based on a light receiving position of the reflected light by the curvature center shake amount measuring light receiving means; ,
Third surface shake detection means for abutting on a peripheral portion of the opposite optical surface and detecting a surface shake amount of the peripheral portion;
An optical lens centering device comprising: The centering device for an optical lens according to any one of claims 1 to 9,
An optical lens centering device wherein the fixing means is an adhesive. A rotating step of adsorbing and rotating one side of a lens to be processed consisting of two optical surfaces by an adsorption rotating means,
An inner curvature center position determining step of determining whether or not the center of curvature with respect to the vicinity of the center of the optical surface sucked by the suction rotating means is positioned on the rotation axis of the suction rotating means;
An outer curvature center position determining step of determining whether a center of curvature with respect to a peripheral portion of the optical surface sucked by the suction rotating means is positioned on the rotation axis;
A position adjusting step of adjusting the position and orientation of the lens to be processed with respect to the suction rotating means, such that the center of curvature with respect to the central portion and the peripheral portion of the optical surface is located on the rotation axis;
A fixing step of making the lens to be processed immovable with respect to the suction rotating means in a state where the center of curvature with respect to the central portion and the peripheral portion of the optical surface is determined to be located on the rotation axis; A processing step of making the processing means capable of reciprocatingly moving in the direction of coming and going to the rotating shaft contact the outer peripheral surface of the lens to be processed, and shaving the outer peripheral surface;
A method for centering an optical lens, comprising: The method for centering an optical lens according to claim 11,
The outer curvature center position discriminating step detects a surface runout amount in a peripheral portion of the optical surface by bringing the first surface runout detecting device into contact with a peripheral portion of the optical surface sucked by the suction rotating device. How to center the optical lens, which is the step. The method for centering an optical lens according to claim 12,
The inner curvature center position determining step includes: bringing the second surface runout detecting unit into contact with the vicinity of the central portion of the optical surface sucked by the suction rotating unit to reduce the amount of surface runout near the central portion of the optical surface. An optical lens centering method, which is a detecting step. The method for centering an optical lens according to claim 13, further comprising:
Irradiating light near the center of the optical surface sucked by the suction rotating means; and receiving light substantially vertically incident near the center of the optical surface and reflected by the optical surface. From the position, the step of causing the confirmation discriminating means for discriminating whether or not the center of curvature of the central portion of the optical surface is located on the rotation axis;
An optical lens centering method comprising: The method for centering an optical lens according to claim 11,
The inner curvature center position determining step includes:
Irradiating light toward the vicinity of the center of the optical surface sucked by the suction rotating means, and substantially perpendicularly entering the vicinity of the center of the optical surface, receiving light reflected by the optical surface; From the light receiving position, the first adjustment determining means for determining whether or not the center of curvature near the center of the optical surface is positioned on the rotation axis;
An optical lens centering method comprising: The method for centering an optical lens according to claim 15,
The outer curvature center position determining step includes:
Irradiating light toward the peripheral portion of the optical surface sucked by the suction rotating means; and receiving light substantially perpendicular to the peripheral portion of the optical surface, receiving light reflected by the optical surface, and receiving the light. From the position, a step of causing the second adjustment determining means for determining whether the center of curvature of the peripheral portion of the optical surface is positioned on the rotation axis to receive light,
An optical lens centering method comprising: The method for centering an optical lens according to any one of claims 11 to 16, further comprising:
Irradiating light toward the optical surface opposite to the optical surface adsorbed after the position adjusting step,
Receiving substantially perpendicularly the optical surface on the opposite side, and receiving the light reflected by the optical surface by a center-curvature-curvature-amount measuring light-receiving unit capable of recognizing a light-receiving position; and Calculating a curvature center shake amount of the opposite optical surface based on a light receiving position of the reflected light by the light receiving unit;
An optical lens centering method comprising: The method for centering an optical lens according to any one of claims 11 to 16, further comprising:
After the position adjustment step, a step of irradiating light toward the vicinity of the center of the optical surface opposite to the optical surface adsorbed,
A step of substantially perpendicularly entering near the center of the opposite optical surface, and receiving the light reflected by the optical surface by a curvature center shake amount measuring light receiving unit capable of recognizing a light receiving position;
Calculating, based on a light receiving position of the reflected light by the curvature center shake amount measuring light receiving means, a curvature center shake amount near the center of the optical surface on the opposite side with respect to the rotation axis of the suction rotation means; and After the step, a step of contacting a third surface runout detecting means with a peripheral portion of the optical surface on the opposite side to detect a surface runout amount of the peripheral portion;
An optical lens centering method comprising: The method for centering an optical lens according to any one of claims 11 to 18,
The centering method of an optical lens, wherein the fixing step is a step of fixing the lens to be processed to the suction rotating means with an adhesive.