Method and apparatus for measuring eccentricity of optical lens, and method and apparatus for centering and edging optical lens
First Claim
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 for 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;
a second determining device for 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; 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.
1 Assignment
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Accused Products
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.
9 Citations
19 Claims
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1. An apparatus for measuring eccentricity of an optical lens, comprising:
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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 for 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;
a second determining device for 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; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for centering and edging an optical lens having an eccentricity measuring apparatus, comprising:
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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 for 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;
a second determining device for 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;
a fixing device for firmly fixing said optical lens to said rotary lens holder; and
a grinding device for grinding said rim of said optical lens, wherein said grinding device is movable between a first position where said grinding device is in contact with said rim of said optical lens and a second position where said grinding device is not in contact with said rim of said optical lens.
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9. A method for measuring eccentricity of an optical lens with an eccentricity detection device, comprising:
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(a) 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;
(b) 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;
(c) 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;
(d) 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
(e) 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for centering and edging an optical lens having an eccentricity measuring apparatus, comprising:
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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;
firmly fixing said optical lens to said rotary lens holder after determining 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
bringing a grinding device into contact with said rim of said optical lens while rotating said optical lens to grind said rim of said optical lens to thereby remove said eccentricity of said optical lens, wherein said grinding device is movable between a first position where said grinding device is in contact with said rim of said optical lens and a second position where said grinding device is not in contact with said rim of said optical lens.
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18. An apparatus for measuring eccentricity of an optical lens, comprising:
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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 for 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, for 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 for 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.
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19. A method for measuring eccentricity of an optical lens, comprising:
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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.
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Specification