Geometrical instruments – Area integrators – Electrical
Patent
1982-08-23
1984-07-17
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33143L, 33147N, 33DIG3, 250237G, G01B 702, G01B 1102
Patent
active
044597495
ABSTRACT:
A hand-held measuring implement comprises a transparent scale-carrying member provided with a graduated scale. A reading unit is movable along said scale in unison with a feeler and comprises photoelectric receivers, which scan the graduated scale through respective line screens. The graduated scale is illuminated by light sources, which are disposed on the same side of the graduated scale as the receivers and are movable with the latter. Signal-processing circuitry is provided for processing the indicating signals generated by the receivers. The implement comprises also a display device and power supply means. To improve the light efficiency and to reduce the power consumption of the light sources and to reduce the effects of an ageing and soiling of the scale-carrying member, the latter is wider than the graduated scale and provided on the side opposite to the line screens with a reflecting covering. The light sources are arranged to direct light against that portion of the scale-carrying member which is laterally spaced from the graduated scale so that said light is reflected by the reflecting covering and subsequently transmitted to the receivers through the graduated scale, which is provided on that side of the scale-carrying member which faces the line screens, and through the line screens.
REFERENCES:
patent: 3142121 (1964-07-01), Stefanov
patent: 3344700 (1967-10-01), Brake
patent: 3816003 (1974-06-01), Litke
patent: 4031595 (1977-06-01), Welker
patent: 4037325 (1977-07-01), Weber et al.
patent: 4229883 (1980-10-01), Kobashi
patent: 4238885 (1980-12-01), Lendi et al.
Rieder Heinz
Schwaiger Max
Kelman Kurt
Stearns Richard R.
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