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:
Jul. 19, 1983
Filed:
Feb. 23, 1981
Gerd-Wolfgang Gotze, Berlin, DE;
Manfred Muller, Berlin, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To provide for tuning of an oscillator circuit, a plurality of resistors are selectively connectable in the circuit. To provide for reproducible, accurate oscillation frequency in accordance with switching of a respective resistor in dependence on a digital input signal, electronic switches are respectively connected to the resistors to connect them in circuit in the oscillator to thereby eliminate variable contact resistances of mechanical switches. A digital frequency control signal is generated by placing a movable mask or pattern with openings therein between an array, for example a linear strip of light emitting diodes, and a similar strip of photo transistors, the respective energization of which is determined by openings in the diaphragm. The signals from the photo transistors are stored in a memory, typically a group of flip-flops, for application to the electronic switches controlling connection of the respective resistors in the oscillator circuit.