Apparatus for detecting focus from astigmatism

Details Apparatus for detecting focus from astigmatism Apparatus for detecting focus from astigmatism

1986-10-14

1988-10-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

047789840

ABSTRACT:
Disclosed is a focus detection apparatus including a light source; focusing means for focusing a light beam emitted from the light source onto an object; a prism for reflecting the light beam from the light source by its surface and for allowing return light from the object to pass therethrough to cause an astigmatism; and detection means for detecting a focusing state of the light beam on the object from the astigmatism of the return light. In this apparatus, the detection means is arranged at a position opposite to the light source to sandwich the prism therebetween, and the return light emerges from a surface thereof different from the incident surface to be guided to the detection means.

REFERENCES:
patent: 4079247 (1978-03-01), Bricot et al.
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4368526 (1983-01-01), Harigae et al.
patent: 4376303 (1983-03-01), Lurie
patent: 4390781 (1983-01-01), Musha
patent: 4482803 (1984-11-01), Lacotte et al.
patent: 4505584 (1985-03-01), Kato et al.

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