Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1986-09-15
1987-10-13
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250201, G03B 300, G01J 120
Patent
active
046994939
ABSTRACT:
A device for detecting the focused state of an objective lens comprises a re-imaging lens unit arranged to distribute light from a primary image formed by the objective lens to form secondary images which have their relative positions varying with the focused state of the objective lens, the re-imaging lens unit including a plurality of re-imaging lenses having a plurality of lens surfaces; and sensing means arranged to sense the light distributions made for the secondary images and to produce signals to be used in computing information on the focused state of the objective lens according to the relative positional relation between light distributions for the secondary images, the sensing means having a plurality of photosensors. In detecting the focused state of the objective lens, the optical axis of at least one of the lens surfaces of each of the re-imaging lenses is decentered relative to other lens surfaces in parallel with the direction in which the photosensors are arrayed.
REFERENCES:
patent: 4634255 (1987-01-01), Suda et al.
Koyama Takeshi
Ohtaka Keiji
Canon Kabushiki Kaisha
Perkey W. B.
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