Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1993-04-26
1995-01-03
Pham, Hoa Q.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, G01B 900
Patent
active
053791118
ABSTRACT:
A lens meter projects measuring light onto a lens, detects the measuring light traveled through the lens at a light detecting element, and determines the optical characteristics of the lens on the basis of the detected data obtained from the light detecting element. The lens meter provides a display device for displaying the relation to adjust the lens to the optical axis of the measuring optical path, measuring mode selector device for selecting a measuring mode from a single focus lens measuring mode to a progressive focus lens measuring mode, a control device for measuring the lens at 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 dislocation between a vertical standard line, on which a measuring position of the refractive power of the far viewing section, crossing a horizontal standard line on a progressive focus lens and passing through a geometrical center thereof is calculated based on the refractive power of the progressive focus lens at each measured position, and a measuring optical axis of the measuring optical path, and a movement conducting mark is displayed on the display device to conduct the measuring to the vertical standard line direction based on the calculated data.
REFERENCES:
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4730924 (1988-03-01), Allard et al.
patent: 5152067 (1992-10-01), Kurachi et al.
patent: 5173739 (1992-12-01), Kurachi et al.
patent: 5247341 (1993-09-01), Kurachi et al.
Kajino Tadashi
Kurachi Mikio
Nidek Co. Ltd.
Pham Hoa Q.
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