Optics: measuring and testing – Lens or reflective image former testing – Optical center – cylinder axis – or prism measuring or...
Patent
1977-07-05
1979-12-25
Clark, Conrad J.
Optics: measuring and testing
Lens or reflective image former testing
Optical center, cylinder axis, or prism measuring or...
G01B 900
Patent
active
041803256
ABSTRACT:
An automated readout for a lens meter is disclosed in combination with a light beam deflecting type of lens meter such as that of a Hartman test. In such a light beam deflecting type of lens meter, a light source having one or more beams is passed through a suspect optical system and deflected by the suspect optical system to a deviated path. Measurement of the deviated path within a preselected area of excursion is typically equated to various powers of the suspect optical system in sphere, cylinder, cylinder axis, and prism. The invention provides for a means of measurement of deviated paths and includes a moving boundary locus with edges of distinctly different shape placed to intercept and occult said deflected beam in a known plane within the area of excursion at a distance from the suspect optical system. The moving boundary locus is typically arranged for movement along a predetermined path at a velocity within the known plane. The boundary locus includes a first substantially transparent portion, a second substantially opaque portion, and at least two boundaries between the opaque and transparent portions. Each of the two boundaries defines a unique non-ambiguous intersection within the area of excursion for each position of the beam and sweeps the preselected area of excursion at differing angularities with respect to the predetermined path of said moving boundary locus. The beam, after leaving the moving boundary locus, is reimaged to a photosensitive detector. By the expedient of measuring the position of the moving boundary locus when the moving boundary occults the beam for two of the boundaries, the amount of beam excursion can be measured and related to optical system measurement. The detector is provided with a circuit which averages the two detector states provided by occultation. This enables lens systems of varying light transmissivity to be measured.
REFERENCES:
patent: 2997699 (1961-08-01), Lovell
patent: 3446559 (1969-05-01), Astheimer et al.
patent: 3606548 (1971-09-01), Dyson
patent: 3614239 (1971-10-01), Kissell
patent: 3880525 (1975-08-01), Johnson
Clark Conrad J.
Humphrey Instruments Inc.
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