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:
Jan. 25, 1977
Filed:
Dec. 26, 1974
John A Gallagher, Barrington, IL (US);
Milan A Broderick, Riverwoods, IL (US);
Bell & Howell Company, Chicago, IL (US);
Abstract
An automatic focusing mechanism for adjusting the focus setting of the objective lens of an optical instrument such as a photographic camera. The adjustable focusing cell of the objective lens is coupled to a pivotal reception means so that the focus setting of the objective lens is maintained coincident with the distance between the camera and an object to be photographed when the longitudinal axis of the reception means is in alignment with a reflected light beam image transmitted from the camera to the object from an emission means spaced from the reception means. A rangefinder circuit controls the pivotal motion of the reception means so as to maintain its longitudinal axis in alignment with the reflected light beam image through variations in camera-to-object distance.