Photocell structure

• US 2,839,646 A
• Filed: 11/14/1955
• Issued: 06/17/1958
• Est. Priority Date: 11/14/1955
• Status: Expired due to Term

• Current Assignee: Frank A. Hester
• Original Assignee: Frank A. Hester
• Inventors: Hester, Frank A.
• Application Number:
  US03/546,494
• Time in Patent Office: 946 Days
• US Class Current: 338/16
• CPC Class Codes: H01L 31/08 in which radiation controls flow of current through the device, e.g. photoresistors

Claims

1. A CELL HAVING ELECTRICAL CONDUCTIVITY RESPONSIVE TO THE INTENSITY OF RAYS INCIDENT THEREON, COMPRISING A TRANSPARENT CYLINDRICAL BODY, AN OPAQUE COATING COVERING THE BODY WITH ONE END OF THE BODY BEING UNCOATED TO LEAVE A WINDOW THEREIN TRNSPARENT TO SAID RAYS, A RIGID FLAT OPAQUE CYLINDRICAL PLATFORM EMBEDDED IN THE BODY, SAID PLATFORM HAVING A FLAT RAY REFLECTIVE END SURFACE DISPOSED PARALLEL TO SAID ONE END OF THE BODY, A PAIR OF ELECTRODES PAINTED ON OPPOSITE SIDES OF THE PLATFORM, A CRYSTAL ELEMENT DISPOSED ON THE BODY AND SPACED FROM SAID REFLECTIVE SURFACE THEREOF, SOLDER MEANS SECURING THE CRYSTAL ELEMENT TO THE PLATFORM, A CAP TRANSPARENT TO SAID RAYS EMBEDDED IN SAID BODY OVER SAID PLATFORM AND SPACED FROM SAID CRYSTAL ELEMENT, SAID CAP ENCLOSING THE CRYSTAL ELEMENT IN A GAS-TIGHT CHAMBER IN SAID BODY, A PAIR OF ELECTRICALLY CONDUCTIVE WIRES EXTENDING THROUGH SAID BODY AND TERMINATING AT THE OPPOSITE FLAT END OF THE PLATFORM, SAID WIRES BEING ELECTRICALLY CONNECTED TO SAID ELECTRODES, SAID ELECTRODES HAVING A HEAT CONDUCTIVITY CHARACTERISTIC SUBSTANTIALLY LESS THAN THAT OF SAID CONDUCTIVE MEMBERS, AND A GASEOUS MEDIUM CHEMICALLY INERT WITH RESPECT TO THE CRYSTAL ELEMENT FILLING SAID CHAMBER, SO THAT THE CRYSTAL ELEMENT IS INSULATED BY SAID CAP AND SAID ELECTRODES FROM THERMAL AND MECHANICAL SHOCKS APPLIED TO THE BODY.