×

Apparatus for measuring the position of a light source disposed inside a lighthouse

  • US 4,630,909 A
  • Filed: 02/14/1985
  • Issued: 12/23/1986
  • Est. Priority Date: 02/15/1984
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for measuring a position of an elongated light source in a lighthouse used in the manufacture of luminescent screens of color picture tubes, comprising:

  • a base plate capable of being placed onto the lighthouse in place of a face-plate and aperture-mask unit;

    first and second optical projection devices carried on said base plate, each projecting an image of said light source on first and second imaging planes, respectively;

    at least two first position diodes disposed in said first imaging plane;

    at least two second position diodes disposed in said second imaging plane; and

    an evaluating circuit coupled to said first and second position diodes.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×