Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-05-16
1995-07-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502015, 356400, G01J 120
Patent
active
054323304
ABSTRACT:
A two-stage detection noncontact positioning apparatus comprises a light position-detecting mechanism 3 which includes a first light position detector 15 having a slit 17 at a central location corresponding to an optical axis K.sub.4, and a light position detector 16 for receiving a measuring beam S.sub.9 having passed through the slit 17. The first light position detector 15 can be switchably operated such that while the second light position detector 16 receives the measuring beam, the first light position detector 15 is made inoperative not to detect light. The apparatus also includes an optical mechanism 2 having focusing lenses 13 and 14 provided in a manner corresponding to the first and second light position detectors 15 and 16, respectively. As the measuring beam, a semiconductor laser beam, a He-Ne laser beam or the like is suitably employed, which enables the two-stage detection noncontact positioning apparatus to perform highly accurate positioning without being adversely affected by scattered lights.
REFERENCES:
patent: 4556964 (1985-12-01), Trethewey
patent: 4684797 (1987-08-01), Ando et al.
patent: 4843228 (1989-06-01), Nakamura
Bednarek Michael D.
Le Que T.
Mitaka Kohki Co. Ltd.
Nelms David C.
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