Digital tape measure

Details Digital tape measure Digital tape measure

1987-04-10

1990-01-02

Shoap, Allan N.

Geometrical instruments

Distance measuring

By flexible tape

377 18, G01B 310

Patent

active

048903922

ABSTRACT:
A digital tape measure comprising a tape stored in a case when it is not used and drawn out of an aperture of the case when it is used and onto which a plurality of detection marks are affixed at equivalent interval, a detector of detecting the detection marks by photoelectric transfer elements, a counter of counting the detected signal being output from the detector corresponding to the volume of movement of the tape, a display of displaying the result counted by the counter, and in which a length of each detection mark is established to be a length twice as long as the minimum scale of the tape, the distance between each detection mark is established to be equivalent to the length of each detection mark in the direction of measurement, and the detector comprises two photoelectric transfer elements arranged at the phase difference of 90.degree. and a discriminator of discriminating the output signal from the photoelectric transfer elements.

REFERENCES:
patent: 3718807 (1973-02-01), Bracken et al.
patent: 4161781 (1979-07-01), Hildebrandt et al.
patent: 4164816 (1979-08-01), Bergkvist
patent: 4242574 (1980-12-01), Grant
patent: 4395630 (1983-07-01), Ramsden et al.
patent: 4438431 (1984-03-01), Toyomura

Affiliated with

Also associated with

Rating

Digital tape measure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital tape measure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital tape measure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1376885