Apparatus for measuring optical characteristic of spectacles

Details Apparatus for measuring optical characteristic of spectacles Apparatus for measuring optical characteristic of spectacles

1990-04-20

1991-07-09

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356244, 33200, G01B 900

Patent

active

050300032

ABSTRACT:
A spectacle lens right/left determination apparatus used in an optical characteristic measurement apparatus for checking and measuring optical characteristic of spectacle lenses, comprises a contact plate which has contact surfaces which are brought into contact with an eye-rim of one spectacle lens to be measured and an eye-rim of the other spectacle lens not to be measured when the spectacle lens to be measured, whose central portion is mounted on and fixed to the optical characteristic measurement apparatus, is inserted in a measurement optical path of the optical characteristic measurement apparatus; a first strain sensor, fixed to the contact plate, for, when a left-eye lens is present on the measurement optical path and the eye-rim of a right-eye lens is brought into contact with the contact surface, detecting a strain of the contact plate; a second strain sensor, fixed to the contact plate, for, when the right-eye lens is present on the measurement optical path and the eye-rim of the left-eye lens is brought into contact with the contact surface, detecting a strain of the contact plate; and electrical circuit for determining the right- or left-eye lens in the measurement optical path on the basis of the outputs from the first and second strain sensors.

REFERENCES:
patent: 3002285 (1961-10-01), Wright
patent: 4098002 (1978-07-01), Campbell et al.
patent: 4410267 (1983-10-01), Shindow et al.

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