Solar panel and timepiece including solar panel

摘要

A solar panel of the present invention, above which a pointer mounted on a pointer shaft inserted in a through hole in a center portion of the solar panel moves, includes a plurality of solar cells arranged in a substantially circular shape, and these solar cells have been divisionally formed into a substantially spiral shape so that the pointer is positioned over two of the plurality of solar cells. Accordingly, the pointer can always be positioned over two of the plurality of solar cells, and therefore a decrease of light-receiving area due to the pointer can be distributed between the two solar cells. As a result, a decrease in the output current of the plurality of solar cells over which the pointer is positioned can be suppressed, and the output current of the entire plurality of solar cells can be improved.

主权项

1. A solar panel formed into a substantially circular shape and having a through hole which is provided at a center portion thereof and into which a pointer shaft is inserted, and a pointer which is mounted on the pointer shaft and which moves above the solar panel, the solar panel comprising:
a plurality of solar cells arranged in a substantially circular shape, wherein the plurality of solar cells are divisionally formed into a substantially spiral shape such that the pointer moving above the plurality of solar cells is always positioned over at least two of the plurality of solar cells, and wherein the plurality of solar cells are formed into a curved spiral shape where a radius of curvature is gradually increased from the through hole side of the solar panel toward an outer circumferential side of the solar panel.