Hitachi Maxell, Limited

Hitoshi Kawamura

Susumu Aoki

Ikuo Shinta

Takashi Hasuda

Keisuke Taguchi

Eiji Takahashi

Manabu Tani

A drive device in which the frequency of a drive waveform applied to a piezoelectric element is easily settable with less obligation to consider resonance in a stationary member. The device includes a piezo element that expands and contracts according to a drive voltage, a transmission shaft that receives vibration produced by the piezo element, a stationary member that holds the transmission shaft in a slidable state along the longitudinal direction of the transmission shaft, and a lens holder that is displaced together with the piezo element and transmission shaft relative to the stationary member according to drive of the piezo element. The piezo element and the transmission shaft move in the moving direction of the lens holder in synchronization with the lens holder according to drive of the piezo element in the state where the piezo element is spaced from the stationary member. By employing this structure, the frequency of the drive waveform applied to the piezo element can be set easily without considering resonance in the stationary member.

Drive device, image acquisition device, and electronic apparatus

A drive device capable of engaging a drive shaft and a part holding the drive shaft with a suitable force without accompanying increase in the size of the drive device. The drive device includes a couple member with a piezoelectric element and a transmission shaft coupled together, a lens holder that holds a lens and to which the couple member is secured, a biasing member that biases the transmission shaft in a direction intersecting a placement direction of the transmission shaft viewed from the lens holder (excluding a lengthwise direction of the transmission shaft), and a link member (link body) that holds the transmission shaft in a slidable manner together with the biasing member.

Drive device, lens part, and camera module

An ultrasonic actuator according to an embodiment of the present invention includes: a stator generating a rotational driving force in accordance with a driving signal having a train pulse, which is used, for example, an AF mechanism; and a rotor converting the rotational driving force into actual movement. In the thus-structured ultrasonic actuator of the present invention, the driving signal is obtained by removing a predetermined number of pulses from the pulse train upon deceleration, and the remaining number of consecutive pulses is set to at least 2 or 4 or more.

Growing community of inventors

Ibaraki, Japan

Hitoshi Kawamura