Patent ID: 8582189
Filing Date: 2013-11-12
Classification: B81B,G02B,Y10T

Abstract:
1. A mirror device comprising: a mirror which is supported to be pivotable with respect to a mirror substrate; a driving electrode which is formed on an electrode substrate facing said mirror substrate; and a control circuit which applies a voltage to said driving electrode, wherein said driving electrode comprises a plurality of driving electrodes formed on said electrode substrate, and said control circuit controls pivotal movement of said mirror by applying a single bias voltage to said plurality of driving electrodes, and simultaneously, individually applying, to each of said plurality of driving electrodes, a driving voltage necessary for making said mirror pivot, a pivot which is formed on said electrode substrate to support a pivotal center of said mirror, wherein said plurality of driving electrodes are arranged around said pivot, wherein said control circuit comprises: a storage unit which stores in advance a relationship between a tilt angle of said mirror and the driving voltage applied to each driving electrode; an acquisition unit which acquires, from said storage unit, a value of the driving voltage necessary for obtaining a desired tilt angle of said mirror in correspondence with each driving electrode; and a power supply which individually applies, to each driving electrode, a voltage having a value corresponding to a sum of the predetermined bias voltage and the acquired driving voltage for each driving electrode.