Multi-layer solid state meter having electroluminescent indication, breakdown diodes and constant-current controlling elements

• US 3,309,610 A
• Filed: 05/28/1963
• Issued: 03/14/1967
• Est. Priority Date: 05/28/1963
• Status: Expired due to Term

• Current Assignee: Yujiro Yamamoto
• Original Assignee: Yujiro Yamamoto
• Inventors: YUJIRO YAMAMOTO
• Application Number:
  US04/283,745
• Time in Patent Office: 1,386 Days
• US Class Current: 324/103.00R
• CPC Class Codes: G01R 13/405 using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs
• CPC Class Codes: H05B 33/00 Electroluminescent light sources

Claims

1. THE COMBINATION COMPRISING A STRIP OF ELECTROLUMINESCENT MATERIAL;

A PLURALITY OF CONSTANT-CURRENT-CONTROLLING MEMBERS;

A PLURALITY OF DIODES HAVING DIFFERENT BREAKDOWN VOLTAGES;

AND MEANS FOR SERIES-CONNECTING A DIODE, A MEMBER OF SAID PLURALITY, AND AN AREA OF SAID STRIP OF SAID ELECTROLUMINESCENT MATERIAL-WHEREBY INPUT SIGNALS OF DIFFERENT MAGNITUDES CAUSE VARIOUS PORTIONS OF SAID STRIP TO GLOW, SAID CONSTANT-CURRENT-CONTROLLING MEMBERS ACTING TO PROVIDE A COMBINATION HAVING A SUBSTANTIALLY CONSTANT INPUT IMPEDANCE.