Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1980-05-19
1982-02-16
Griffin, Donald A.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250201, 354 53, G03B 708, G01J 120, G03B 1720
Patent
active
043156746
ABSTRACT:
A focal point detection system for detecting the focus adjusting state of an image forming lens during its focusing operation on an object is disclosed. The system comprises a focus detection circuit which produces a detection output that varies with focusing of the lens on the object; a plurality of display elements are provided for display of the focusing state of the lens; and a display control circuit which enables the display elements to display a greater number of focusing states than the number of these display elements through selective combinations of these elements on the basis of the output of the focus detection circuit. The system is capable of displaying intermediate focusing states such as a slightly near-focus state, a slightly far-focus state, and the like in addition to in-focus, near-focus, and far-focus states, so that the focusing state can be displayed stepwise in a detailed manner.
REFERENCES:
patent: 3504610 (1970-04-01), Donitz
patent: 3529528 (1970-09-01), Leitz
patent: 3776639 (1973-12-01), Stauffer
patent: 4117325 (1978-09-01), Holle et al.
patent: 4230401 (1980-10-01), Tokutomi et al.
Fukuda Minoru
Hosoe Kazuya
Ito Tadashi
Kawabata Takashi
Kinoshita Takao
Canon Kabushiki Kaisha
Griffin Donald A.
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