Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-08-18
1990-09-25
Arnold, Bruce Y.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
350522, 2502013, 2502014, G02B 2126, G01J 120
Patent
active
049589202
ABSTRACT:
Fast and versatile autofocusing for microscopes is achieved by the interaction of two known systems: a first, active autofocusing system (12) which projects at least one light dot on the object and develops a focusing signal dependent upon the character of a reflection of the dot; and a second, passive autofocusing system which creates a video signal representative of an image of the object and then uses the image contrast of that video signal as a focusing criterion. Provided for both systems is a joint control unit (45) to which the signals (g), (f) of both focusing systems are transmitted and which, successively, activates first the active and then the passive autofocusing system. The process can be used to focus on both covered and uncovered objects illuminated by transmitted as well as reflected light. Quick, automatic focusing is accomplished in that the active focusing system rapidly focuses first on either the cover glass surface or the object surface and then control is switched to the passive autofocusing system which only needs to travel a very short distance to achieve accurate final focus of a preselected plane of the object.
REFERENCES:
patent: 3883689 (1975-05-01), Mansour et al.
patent: 4600832 (1986-07-01), Grund
patent: 4639587 (1987-01-01), Chadwick et al.
patent: 4737022 (1988-04-01), Faltermeier et al.
patent: 4897537 (1990-01-01), Miyamoto et al.
patent: 4902101 (1990-02-01), Fujihara et al.
Faltermeier Bernd
Jorgens Reinhard
Arnold Bruce Y.
Carl-Zeiss-Stiftung
Kachmarik Ronald M.
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