Abstract: A photovoltaic collector includes a photovoltaic cell including a first conduction layer, a second conduction layer, and a photovoltaic layer absorbing incident light and generating electric current. The photovoltaic layer is electrically connected to the first conduction layer on a first side of the photovoltaic layer and to the second conduction layer on a second side opposite to the first side. The first conduction layer is an ultrastatic conducting layer being made using ultrasonic spray technology. The photovoltaic collector further includes a plurality of connection units disposed along on an outer peripheral edge of the photovoltaic collector. Each connection unit is adapted to connect with an adjacent connection unit of an adjacent photovoltaic collector to tessellate and electrically interconnect and interlock the photovoltaic collector with a plurality of adjacent photovoltaic collectors without requiring additional cable wires.

Abstract: The present invention proposes an external-coupled electronic angle measurement apparatus including a housing, a display element, an angle detection system and a coupling portion. The housing is movable through the coupling portion to fasten the external-coupled electronic angle measurement apparatus to a desired location of different hand tools to accurately measure turning angles of a screw driven by the hand tool through the angle detection system and display the result on the display element.

Abstract: The present invention proposes an external-coupled electronic angle measurement apparatus including a housing, a display element, an angle detection system and a coupling portion. The housing is movable through the coupling portion to fasten the external-coupled electronic angle measurement apparatus to a desired location of different hand tools to accurately measure turning angles of a screw driven by the hand tool through the angle detection system and display the result on the display element.