| 摘要 |
A indicator dial having a plurality of shutters disposed on a base portion and movable between radially retracted and extended positions, an at least partially arcuate visual indicator disposed on the base portion and located radially outwardly of the shutters when the shutters are in the retracted position, a cover portion having a cam groove disposed on a side thereof adjacent the plurality of shutters, a portion of the shutters protruding into the cam groove of the cover portion, the cover portion rotatable relative to the base portion to move the shutters between the retracted and extended positions so that the shutters cover the portions of the light emitting ring when the shutters are in the extended position.
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