DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR

摘要

A driving circuit to drive a vibration member comprising an electro-mechanical energy conversion element includes a transformer connected in parallel to the electro-mechanical energy conversion element. The transformer includes a primary coil configured such that an alternating voltage is applied to the primary coil, and a secondary coil connected to the electro-mechanical energy conversion element in parallel, and an inductor connected to the primary coil in series, Parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied.

主权项

1. A driving circuit configured to drive a vibration member comprising an electro-mechanical energy conversion element, the driving circuit comprising:
a transformer connected in parallel to the electro-mechanical energy conversion element and comprising: a primary coil configured such that an alternating voltage is applied to the primary coil; and a secondary coil connected to the electro-mechanical energy conversion element in parallel; and an inductor connected to the primary coil in series, wherein parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied.