Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1994-11-15
1996-05-28
Hille, Rolf
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, 356125, G01B 900
Patent
active
055217001
ABSTRACT:
The present invention provides a lens meter capable of accurately measuring the optical characteristics of a lens including additive diopter and of providing highly reliable data representing the optical characteristics of the lens. The lens meter projects measuring light through a target mark on a lens, focuses an image of the target mark in a target image on a photo-detecting device, and determines the optical characteristics of the lens on the basis of a locus of the target image detected by the photo-detecting device. The lens meter comprises an additive diopter measuring mode selector switch, a control means for shifting the lens to position measuring points distributed at predetermined intervals on the lens successively on a measuring optical axis and measuring the refractive power of the lens at each measuring point, a position detecting means for detecting the distance of each measuring point from a predetermined reference point, and a display means for displaying the relation between the distance of the measuring point from the reference point and the variation of the spherical refractive power of the lens.
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Nidek LM-870 Auto-Lensmeter Operation Manual.
Fujieda Masanao
Kajino Tadashi
Kurachi Mikio
Nozawa Noritsugu
Hille Rolf
Nidek Co. Ltd.
Williams Alexander Oscar
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