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. 15, 1986
Filed:
May. 26, 1983
Hiroshi Ishida, Tokyo, JP;
Shigeyuki Ushiyama, Hino, JP;
Fanuc Ltd., , JP;
Abstract
A pulse encoder having a circuit for diagnosing abnormalities such as the breaking of wire in LEDs or lowering of a power supply voltage, the pulse encoder comprising LEDs, a rotary lattice plate, a stationary lattice plate, light-receiving elements, and a driving unit for driving the electric signals from the light-receiving elements, the driving unit having a control terminal for controlling the output signal of the driving unit, wherein the anode of one of the LEDs connected to the ground is connected to the control terminal so that when the potential of the control terminal is lowered to a level lower than a predetermined value an alarm signal is output from the driving unit.