Digital tape measure

Details Digital tape measure Digital tape measure

1985-09-11

1987-04-14

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33140, G01D 534, G01B 312

Patent

active

046581340

ABSTRACT:
A digital tape measure comprising a tape stored in a casing body being wound on a reel so as to be movable corresponding to a length of measuring object when drawn out and on which a detection mark is indicated and a photoelectric transfer element for receiving a light projected to the tape and reflected therefrom and converting the light to an electric signal, the combination with a control roller for controlling a moving state of the tape on the moving passage which is disclosed between the reel and photoelectric transfer element to form a spacing corresponding to an allowance of the focal distance of the photoelectric transfer element between the roller surface and the tape surface.

REFERENCES:
patent: 4242574 (1980-12-01), Grant

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