Ophthalmic optical apparatus having an alignment optical system

Details Ophthalmic optical apparatus having an alignment optical system Ophthalmic optical apparatus having an alignment optical system

1992-08-21

1994-02-08

Bertsch, Richard A.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, A61B 314

Patent

active

052852237

ABSTRACT:
An ophthalmic optical apparatus having an alignment optical system comprises two conical optical elements for forming an alignment light beam into a ring-shaped collimated light beam centered on an optical axis and directing it to a focusing optical system, an in-focus state is determined based on a light pattern formed by the focusing optical system from the ring-shaped collimated light beam on an object plane.

REFERENCES:
patent: 3842254 (1973-08-01), Dianetti
patent: 4264153 (1981-04-01), Ito
patent: 4499897 (1985-02-01), Roussel
patent: 4564273 (1986-01-01), Iba et al.
patent: 4673264 (1987-06-01), Takahashi
patent: 4848896 (1989-07-01), Matsumoto
patent: 4917486 (1990-11-01), Rinklake et al.
patent: 5101826 (1990-04-01), Katsuragi

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