Method and apparatus for measuring eccentricity of optical lens, and method and apparatus for centering and edging optical lens

• US 7,046,351 B2
• Filed: 05/19/2003
• Issued: 05/16/2006
• Est. Priority Date: 05/20/2002
• Status: Expired due to Fees

• Current Assignee: Pentax Corporation (Hoya Corporation)
• Original Assignee: Pentax Corporation (Hoya Corporation)
• Inventors: Ito, Takayuki
• Primary Examiner(s): Pham, Hoa Q.
• Application Number:
  US10/440,122
• Publication Number:
  US 20030214646A1
• Time in Patent Office: 1,093 Days
• Field of Search: 356124-127
• US Class Current: 356/127
• CPC Class Codes: B29D 11/00942 where the lens material is mounted in a support for mounting onto a cutting device, e.g. a lathe, and where the support is of machinable material, e.g. plastics
• CPC Class Codes: G01M 11/0221 by determining the optical axis or position of lenses

Abstract

An apparatus for measuring eccentricity of an optical lens includes a rotary lens holder which supports a first lens surface of an optical lens by vacuum aspiration; a first determining device for determining whether a curvature center of a central portion of the first lens surface is positioned on the rotational axis; a second determining device for determining whether a curvature center of a peripheral portion of the first lens surface is positioned on the rotational axis; and an eccentricity detection device which detects an eccentricity of the optical lens with respect to the rotational axis to calculate an eccentricity of a vertex of the first lens surface with respect to the radial center of the optical lens, including a detector contacts a rim of the optical lens to detect the eccentricity of the optical lens with respect to the rotational axis.

Claims

1. An apparatus for measuring eccentricity of an optical lens, comprising:

a rotary lens holder which rotates about a rotational axis thereof while supporting a first lens surface of an optical lens by vacuum aspiration;

a first determining device that determines whether a curvature center of a central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder;

a second determining device that determines whether a curvature center of a peripheral portion of said first lens surface is positioned on said rotational axis of said rotary lens holder; and

an eccentricity detection device which detects an eccentricity of said optical lens with respect to said rotational axis of said rotary lens holder to calculate an eccentricity of a vertex of said first lens surface with respect to the radial center of said optical lens, said eccentricity detection device including a detector having a contact which comes in contact with a rim of said optical lens to detect said eccentricity of said optical lens with respect to said rotational axis of said rotary lens holder.

2. The eccentricity measuring apparatus according to claim 1, wherein said detection of said eccentricity of said optical lens, with said contact of said eccentricity detection device in contact with said rim of said optical lens, is performed upon achieving a state wherein said first determining device determines that said curvature center of said central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder and upon achieving a state wherein said second determining device determines that said curvature center of said peripheral portion of said first lens surface is positioned on said rotational axis of said rotary lens holder.

3. The eccentricity measuring apparatus according to claim 1, wherein said second determining device comprises a second detector that detects the degree of deviation of said peripheral portion of said first lens surface with respect to said rotational axis of said rotary lens holder, said second detector including a second contact which comes in contact with said peripheral portion of said first lens surface to detect said degree of deviation of said peripheral portion of said first lens surface.

4. The eccentricity measuring apparatus according to claim 1, wherein said first determining device comprises:

an adjustment phototransmitter which projects light to be incident on said central portion of said first lens surface; and

a first light-receiving and determining device which receives incident light thereon, said incident light being projected from said adjustment phototransmitter to be vertically incident on said central portion of said first lens surface and vertically reflected by said central portion of said first lens surface, to determine whether said curvature center of said central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said received incident light on a light receiving surface of said first light-receiving and determining device.

5. The eccentricity measuring apparatus according to claim 1, wherein said second determining device comprises:

a deviation detector that detects the degree of deviation of said central portion of said first lens surface with respect to said rotational axis of said rotary lens holder, said deviation detector including a contact which comes in contact with said central portion of said first lens surface to detect said degree of deviation of said central portion of said first lens surface;

a confirmation phototransmitter which projects light to be incident on said central portion of said first lens surface; and

a light-receiving and determining device which receives incident light thereon, which is projected from said confirmation phototransmitter to be vertically incident on said central portion of said first lens surface to be vertically reflected by said central portion of said first lens surface, to determine whether said curvature center of said central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said received incident light on a light receiving surface of said light-receiving and determining device.

6. The eccentricity measuring apparatus according to claim 1, further comprising:

a measurement phototransmitter which projects light to be incident on a second lens surface of said optical lens;

a light-receiving device which receives incident light thereon that is projected from said measurement phototransmitter to be vertically incident on said second lens surface to be vertically reflected by said second lens surface, wherein said light-receiving device can sense an incident position of said received incident light on a light receiving surface of said light-receiving device; and

a processor that determines whether said curvature center of said second lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said incident light received by said light-receiving device on said light receiving surface thereof to measure an eccentricity of said curvature center of said second lens surface with respect to said rotational axis of said rotary lens holder.

7. The eccentricity measuring apparatus according to claim 1, further comprising:

a measurement phototransmitter which projects light to be incident on a central portion of a second lens surface of said optical lens;

a light-receiving device which receives incident light thereon that is projected from said measurement phototransmitter to be firstly vertically incident on a central portion of said second lens surface and to be subsequently vertically reflected by said central portion of said second lens surface to be incident on said light-receiving device, wherein said light-receiving device can sense an incident position of said received incident light on a light receiving surface of said light-receiving device;

a processor that determines whether said curvature center of said central portion of said second lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said incident light received by said light-receiving device on said light receiving surface thereof to measure an eccentricity of said curvature center of said second lens surface with respect to said rotational axis of said rotary lens holder; and

a fourth detector that detects the degree of deviation of a peripheral portion of said second lens surface with respect to said rotational axis of said rotary lens holder, said fourth detector comprising a fourth contact which comes in contact with said peripheral portion of said second lens surface to detect said degree of deviation of said peripheral portion of said second lens surface.

8. A method for measuring eccentricity of an optical lens with an eccentricity detection device, comprising:

rotating an optical lens, having a first lens surface and a second lens surface, about a rotational axis of a rotary lens holder while supporting said first lens surface by vacuum aspiration;

determining whether a curvature center of a central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder;

determining whether a curvature center of a peripheral portion of said first lens surface is positioned on said rotational axis of said rotary lens holder;

adjusting a position of said optical lens with respect to said rotary lens holder so that said curvature center of said central portion and said curvature center of said peripheral portion are positioned on said rotational axis of said rotary lens holder; and

detecting an eccentricity of said optical lens with respect to said rotational axis of said rotary lens holder, in state wherein said curvature centers of said central portion and said peripheral portion of said first lens surface are positioned on said rotational axis of said rotary lens holder, to calculate an eccentricity of a vertex of said first lens surface with respect to the radial center of said optical lens, said eccentricity detection device including a contact which comes in contact with a rim of said optical lens to detect said eccentricity of said optical lens with respect to said rotational axis of said rotary lens holder.

9. The eccentricity measuring method according to claim 8, wherein determining whether a curvature center of a peripheral portion of said first lens surface is positioned on said rotational axis of said rotary lens holder comprises making a first contact sensor come in contact with said peripheral portion of said first lens surface to detect an amount of deviation of said peripheral portion of said first lens surface.

10. The eccentricity measuring method according to claim 8, wherein determining whether a curvature center of a central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder comprises making a contact sensor come in contact with said central portion of said first lens surface to detect an amount of deviation of said central portion of said first lens surface.

11. The eccentricity measuring method according to claim 10, wherein determining whether a curvature center of a central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder comprises:

making a second detector come in contact with said central portion of said first lens surface to detect said degree of deviation of said central portion of said first lens surface; and

after adjusting the position of said optical lens with respect to said rotary lens holder, making a first light-receiving and determining device receive incident light which is projected from a phototransmitter to be vertically incident on said central portion of said first lens surface to be vertically reflected by said central portion of said first lens surface, said first light-receiving and determining device determining whether said curvature center of said central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said received incident light on a light receiving surface of said first light-receiving and determining device.

12. The eccentricity measuring method according to claim 8, wherein determining whether a curvature center of a central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder comprises:

projecting light to be incident on said central portion of said first lens surface; and

making a first light-receiving and determining device receive the incident light which is projected to be vertically incident on said central portion of said first lens surface to be vertically reflected by said central portion of said first lens surface, said first light-receiving and determining device determining whether said curvature center of said central portion of said first lens surface is positioned on said rotational axis of said rotary lens holder from an incident position of said received incident light on a light receiving surface of said first light-receiving and determining device.

13. The eccentricity measuring method according to claim 8, further comprising:

projecting light to be vertically incident on a second lens surface of said optical lens after adjusting the position of said optical lens with respect to said rotary lens holder;

receiving incident light which is vertically reflected by said second lens surface; and

determining an eccentricity of said curvature center of said second lens surface with respect to said rotational axis of said rotary lens holder.

14. The eccentricity measuring method according to claim 8, further comprising:

projecting light to be vertically incident on a central portion of said second lens surface of said optical lens after adjusting the position of said optical lens with respect to said rotary lens holder;

receiving incident light which is vertically reflected by said central portion of said second lens surface; and

determining an eccentricity of said curvature center of said central portion of said second lens surface with respect to said rotational axis of said rotary lens holder.

15. The eccentricity measuring method according to claim 8, wherein at least said first lens surface of said optical lens, which is supported by said rotary lens holder, is formed as an aspherical surface.

16. An apparatus for measuring eccentricity of an optical lens, comprising:

a rotary lens holder which rotates about a rotational axis and supports a first lens surface of an optical lens by vacuum aspiration so that an aspherical-surface axis of said optical lens substantially coincides with said rotational axis;

a first contact sensor which comes in contact with a central portion of said first lens surface;

a second contact sensor which comes in contact with a peripheral portion of said first lens surface;

a third contact sensor which comes in contact with a rim of said optical lens; and

a processor that determines whether a curvature center of said central portion of said first lens surface is positioned on said rotational axis from a signal output from said first contact sensor, determines whether a curvature center of said peripheral portion of said first lens surface is positioned on said rotational axis from a signal output from said second contact sensor, and determines an eccentricity of said rim of said optical lens with respect to said rotational axis of said rotary lens holder from a signal output from said third contact sensor to calculate an eccentricity of a vertex of said first lens surface with respect to the radial center of said optical lens.

17. A method for measuring eccentricity of an optical lens, comprising:

rotating a lens holder which supports an optical lens about a rotational axis, said lens holder supporting a first lens surface of said optical lens by vacuum aspiration so that an aspherical-surface axis of said optical lens substantially coincides with said rotational axis;

making a first contact sensor come in contact with a central portion of said first lens surface;

making a second contact sensor come in contact with a peripheral portion of said first lens surface;

making a third contact sensor come in contact with a rim of said optical lens;

determining whether a curvature center of said central portion of said first lens surface is positioned on said rotational axis from a signal output from said first contact sensor;

determining whether a curvature center of said peripheral portion of said first lens surface is positioned on said rotational axis from a signal output from said second contact sensor; and

determining an eccentricity of said rim of said optical lens with respect to said rotational axis of said rotary lens holder from a signal output from said third contact sensor to calculate an eccentricity of a vertex of said first lens surface with respect to the radial center of said optical lens.