US PATENT SUBCLASS 242 / 331.4
.~.~.~.~ Photoelectric controller

Current as of: June, 1999
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242 /   HD   WINDING, TENSIONING, OR GUIDING

324  DF  UNWINDING AND REWINDING A MACHINE CONVERTIBLE INFORMATION CARRIER (E.G., MAGNETIC TAPE OR PHOTOGRAPHIC FILM) {13}
331  DF  .~ Intermediate storage (e.g., low inertia bin) {2}
331.1  DF  .~.~ Vacuum column {1}
331.2  DF  .~.~.~ Carrier responsive control {2}
331.4.~.~.~.~ Photoelectric controller

DEFINITION

Classification: 242/331.4

Photoelectric controller:

(under subclass 331.2) Subject matter wherein the regulator

comprises a radiation source (e.g., a light beam) and an electron emission receiving device for generating a signal proportionate to the length of carrier in the buffer zone.

SEE OR SEARCH CLASS

250, Radiant Energy, for a detail of a photoelectric device, per se, or in combination with generalized structure, particularly

200+, and 559.01.