초록 ▼

A digital angle indicator for the measurement of predetermined angles. The indicator comprises a rotatably mounted gravity responsive opaque rotor having transparent slots therein for selectively passing light from light sources to light detectors, said light detectors being connected to a plurality

A digital angle indicator for the measurement of predetermined angles. The indicator comprises a rotatably mounted gravity responsive opaque rotor having transparent slots therein for selectively passing light from light sources to light detectors, said light detectors being connected to a plurality of visual indicators through a digital logic circuit for activating said visual indicators in response to said light detectors. The visual indicators provide an indication of the attainment of the angle being measure and values greater or lesser than the desired angle.

대표청구항 ▼

Ditigal angle indicator apparatus comprising: a housing; a disc freely rotatably mounted about an axis in said housing; a first light transmissive area disposed on said disc and spaced radially from said axis, said first light transmissive area being defined by an arcuate opening in said disc; a pai

Ditigal angle indicator apparatus comprising: a housing; a disc freely rotatably mounted about an axis in said housing; a first light transmissive area disposed on said disc and spaced radially from said axis, said first light transmissive area being defined by an arcuate opening in said disc; a pair of light emitter means disposed to direct light toward said gravity responsive means; a pair of light detecting means carried by said housing for detecting light from said light emitter means which is transmitted by said light transmissive areas, said light emitter means being circumferentially spaced from each other a distance equal to or less than the arc length of said opening such that both of said light detecting means detect light from said light emitter means transmitted from said first light transmissive area when said gravity responsive means is in a first orientation with respect to said housing; a second light transmissive area disposed on said disc and spaced radially from said axis a distance equal to the distance which said first light transmissive area is spaced from said axis, said second light transmissive area being angularly spaced from said first light transmissive area such that said disc blocks light from both of said light detecting means when said gravity responsive means is in a second orientation with respect to said housing and such that both of said light detecting means detect light from said light emitter means transmitted from said second light transmissive area when said gravity responsive means is in a third orientation with respect to said housing; and indicator means operatively associated with said light detecting means to provide a first indication in response to an illumination condition of both of said light detecting means, to provide a second indication in response to the illumination of neither light detecting means, and to provide at least one other indication denoting an illumination of only one of said light detecting means.