Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1997-09-29
2000-05-09
Font, Frank G.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, G01B 900
Patent
active
060611235
ABSTRACT:
A lens meter is provided in which a measurement light beam emitted from a light source (21) is projected onto a lens (L) to be inspected, an amount in travel of the measurement light beam which has passed through the lens (L) is then detected by a TV camera (34), and the refractive characteristics of the lens (L) based on the detection result are computed by an arithmetic and control circuit (35) and are displayed by a display unit (3). In the lens meter, the arithmetic and control circuit (35) computes cylindrical power of a distance portion (40) of the lens (L) in consideration of cylindrical power and a direction of a cylindrical axis from the detection result of the TV camera (34), and then computes cylindrical power in distortion areas (42, 43) except the distance portion (40), a progressive portion (41), and a near portion (41') in consideration of the cylindrical power and the direction of the cylindrical axis. After that, the arithmetic and control circuit (35) subtracts the cylindrical power of the distance portion (40) from the cylindrical power of the distortion areas (42, 43). Based on the obtained subtraction results, the arithmetic and control circuit (35) computes boundary lines (44, 45) between the distance, progressive, and near portions (40, 41, 41') and the distortion areas (42, 43) except these portions, and allows the display unit (3) to display the boundary lines (44, 45).
REFERENCES:
patent: 5414505 (1995-05-01), Ikezawa et al.
patent: 5521700 (1996-05-01), Kajino et al.
patent: 5525836 (1996-06-01), Minix
Fukuma Yasufumi
Ikezawa Yukio
Kato Takeyuki
Yanagi Eiichi
Font Frank G.
Kabushiki Kaisha Topcon
Punnoose Roy M.
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