Automatic focussing apparatus for microscope

Details Automatic focussing apparatus for microscope Automatic focussing apparatus for microscope

1978-03-13

1980-05-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

042030315

ABSTRACT:
An automatic focussing apparatus for microscopes includes a pair of photoelectric transducer elements disposed short of and beyond the imaging position, respectively, of an optical system which is used for the purpose of focussing. Each element is connected with a separate loop comprising an A/D converter which converts an output signal from the associated element corresponding to each picture element into a digital quantity, a sample-and-hold circuit, a calculation circuit which responds to the digital signal to derive an evaluation function, and an accumulator which stores the resulting value. The individual accumulators are connected with a comparison circuit, which is in turn connected with a focus control circuit controlling the optical system.

REFERENCES:
patent: 3857031 (1974-12-01), Sinclair et al.
patent: 3967110 (1976-06-01), Rogers et al.
patent: 4078171 (1978-03-01), Stauffer

Affiliated with

Also associated with

Rating

Automatic focussing apparatus for microscope does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic focussing apparatus for microscope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focussing apparatus for microscope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-931162