Apparatus for measuring the position of a light source disposed inside a lighthouse
First Claim
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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.
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Abstract
Measuring apparatus for measuring the position of a light source inside a lighthouse as used in the manufacture of phosphor screens of color picture tubes comprises a base plate and two optical projection devices which are directed on to the light source, and which each contain at least two position diodes. An evaluating circuit connected thereto ascertains the position of the light source and the result is fed to a display device.
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Citations
6 Claims
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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:
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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 Dependent Claims (2, 3, 4, 5, 6)
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Specification