Provided is a collector sheet for a solar cell, wherein the collector sheet for solar cell can prevent short circuiting between a non-photoreception surface side element and a wiring section, as well as cushioning shocks. The retarding mechanism continuously retards the opening and closing movements of the dipper door by controllably braking or slowing the at least one braking arm using the compressive action of at least one hydraulic piston mounted to the braking assembly. The varainductor further includes an array of switches, the array of switches is configured to selectively connect the ground ring to the floating ring. 9, a figure well achievable in the state of the art. 0 m, and the flectional elasticity module is it least 700 Nmm2 in the main loading direction.