Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1988-11-04
1991-02-19
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502012, G03B 1336, G02B 728
Patent
active
049948415
ABSTRACT:
An automatic focus condition detecting device comprising an objective lens; a unit for receiving light from an object through the objective lens; a focus detecting unit responsive to the output of the receiving unit for detecting a focusing condition of the objective lens; a unit responsive to the output of the receiving unit for judging whether or not it is possible for the focus detecting unit to detect a focusing condition of the objective lens; a lens position detecting unit for detecting whether or not the objective lens is positioned within a predetermined range included in the lens driving range; a unit for driving the objective lens; and a unit for controlling the driving unit to drive the objective lens when the judging judges that it is impossible for the focus detecting unit to detect a focusing condition and, moreover, the lens detecting unit detects that the objective lens is positioned within the predetermined range, for the purpose of a search a lens position where the focus detecting unit can detect a focusing condition.
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Hamada Masataka
Ishida Tokuji
Norita Toshio
Ootsuka Hiroshi
Minolta Camera Kabushiki Kaisha
Perkey W. B.
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