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:
Oct. 10, 1978
Filed:
Jul. 30, 1976
Howard J Morrison, Deerfield, IL (US);
Donald K Fletchic, Arlington Heights, IL (US);
Ralph H Baer, Manchester, NH (US);
Marvin Glass & Associates, Chicago, IL (US);
Abstract
A phonograph cartridge is provided for use on a programmable phonograph turntable or changer. The cartridge includes a housing for mounting an electro-mechanical transducer on the end of a phonograph tone arm and a stylus connected to the electro-mechanical transducer for the reproduction of audio information contained in the groove of a record carrier. A sensor including a light source and a photodetector is mounted on the housing in a position in close proximity to the stylus to provide a unitary cartridge and sensor assembly. The stylus and sensor elements are mounted on a subframe portion which is removable from the housing to facilitate replacement of the stylus or sensor without requiring replacement of the entire phonograph cartridge.