The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 1986
Filed:
Jun. 27, 1983
Nippon Kogaku K. K., Tokyo, JP;
Abstract
A focus detecting apparatus having an optical device movable to cause the light from an object to be imaged on a predetermined plane and comparing the different imaged conditions of the light from the object on the predetermined plane comprises a light intensity distribution detecting device for detecting the distribution of the intensity of light on the predetermined plane and putting out a detection signal indicative of the distribution of the intensity of light on the predetermined plane, a device for taking out a high frequency component from the detection signal, a device for rectifying the taken out high frequency component, a device for forming the envelope of the rectified high frequency component, a device for integrating the envelope at any time and putting out an integrated value, and a focus detecting device for detecting, on the basis of the integrated value of the envelope, the amount of movement necessary for the imaging optical device to cause the light from the object to be imaged on the predetermined plane.