Lens meter
AssigneeKabushiki Kaisha TOPCOM
InventorsYukio Ikezawa, Eiichi Yanagi, Takeyuki Kato
Life of this patent
Estimating the term…
Abstract
A lens meter having a projection system (5) provided with a projection light source (7) adapted to project a measuring beam onto a lens (14) to be examined, and a light receiving system (6) provided with a light receiving element (15) adapted to receive the measuring beam which has passed through the test lens (14), the optical characteristics of the test lens (14) being determined on the basis of a position in which the light receiving element (15) receives the measuring beam which has passed through the test lens, comprising a test lens turning mechanism (16) adapted to turn the test lens (14) around a center (0) of a turning movement corresponding to that of a turning movement of an eyeball in a spectacle lens-worn state.
Claims13
A lens meter including:
- a projection system provided with a projection light source adapted to project a measuring beam onto a lens to be tested, or a test lens, and a light receiving system provided with a light receiving element adapted to receive the measuring beam which has passed through said test lens, optical characteristics of the test lens being determined on the basis of a position in which said light receiving element receives the measuring beam which has passed through the test lens,
- the lens meter further including a test lens turning mechanism adapted to turn said test lens around a center of a turning movement corresponding to that of a turning movement of an eyeball in a spectacle lens-worn state.
A lens meter including a projection system provided with a projection light source adapted to project a measuring beam onto a lens to be tested, or a test lens, and a light receiving system provided with a light receiving element adapted to receive the measuring beam which has passed through said test lens, optical characteristics of the test lens being determined on the basis of a position in which said light receiving element receives the measuring beam which has passed through the test lens,
- the lens meter further including a test lens holding mechanism adapted to hold said test lens and turn the test lens around a center of a turning movement corresponding to that of a turning movement of an eyeball in a spectacle lens-worn state, said center of a turning movement for turning the test lens being positioned on an optical axis of said light receiving system.
A lens meter including:
- a projection system provided with a projection light source adapted to project a measuring beam onto a lens to be tested, or a test lens, and a light receiving system provided with a light receiving element adapted to receive the measuring beam which has passed through said test lens, optical characteristics of the test lens being determined on the basis of a position in which said light receiving element receives the measuring beam which has passed through the test lens,
- the lens meter further including a measuring section turning mechanism adapted to turn a measuring section as if said test lens were turned around a center of a turning movement corresponding to that of a turning movement of an eyeball in a spectacle lens-worn state, said measuring section comprising said projection system and said light receiving system.
A lens meter including:
- a projection system provided with a projection light source adapted to project a measuring beam from a surface side of a lens to be tested, or a test lens, said measuring beam being used to determine optical characteristics of said test lens;
- and
- a light receiving system provided with a light receiving element adapted to receive the measuring beam from a back side of said test lens after passage of the beam through the test lens, the optical characteristics of the test lens being determined on the basis of a position in which said light receiving element receives the measuring beam after passage through the test lens,
- wherein a center of a turning movement corresponding to that of a turning movement of an eyeball is defined by an intersecting point between a light receiving axis orthogonal to a light receiving surface of the light receiving element and said light receiving surface, either said test lens or said light receiving system is constructed so that it can turn around said center of a turning movement, and said projection system is constructed so as to permit a turning movement thereof.
A lens meter including:
- a projection system provided with a projection light source adapted to project a measuring beam from a surface side of a lens to be tested, or a test lens, said measuring beam being used to determine optical characteristics of said test lens;
- and a light receiving system provided with a light receiving element adapted to receive said measuring beam from a back side of said test lens after passage of the measuring beam through the test lens, the optical characteristics of the test lens being determined on the basis of a position in which said light receiving element receives the measuring beam after passage through the test lens,
- wherein a center of a turning movement corresponding to that of a turning movement of an eyeball is defined by an intersecting point between a light receiving axis orthogonal to a light receiving surface of said light receiving element and said light receiving surface, either said test lens or said light receiving system is constructed so that it can turn around said center of a turning movement, and said projection system is provided with a prism compensator for obtaining a measuring beam equal to that obtained by turning the projection system around said center of turning movement.
Dependencies are inferred from the claim text.