One aspect of the present invention relates to a driver of a vibrator including: a control section; and an alternating current signal generation section configured to generate an alternating current signal based on an output from the control section, and to apply the alternating current signal to the vibrator, wherein the control section is configured to lower a frequency of the alternating current signal, and to change, after the frequency change, at least one of a voltage ratio and a phase difference of the alternating current signal such that the ellipse ratio of the elliptical motion changes from a first ellipse ratio to a second ellipse ratio, the second ellipse ratio has a larger ratio of a component in a moving direction in the elliptical motion to a component in a direction perpendicular to the moving direction in the elliptical motion than the first ellipse ratio.

A device may comprise a substrate formed of a first semiconductor material and a trench formed in the substrate. A second semiconductor material may be formed in the trench. The second semiconductor material may have first and second portions that are isolated with respect to one another and that are isolated with respect to the first semiconductor material.

An optical system is provided, including a first optical module, a second optical module, and a light-quantity adjustment module. The first optical module, the second optical module, and the light-quantity adjustment module are arranged in a direction of an optical axis. The first optical module and the second optical module are movable in the direction of the optical axis.

A vibrating device includes a tubular vibrating body and a lens cover coupled to a first surface of the tubular vibrating body. The tubular vibrating body includes a tubular member and piezoelectric vibrators. The lens cover includes a mode changing coupler and a light transmitting body unit disposed in front of a lens of a camera. The mode changing coupler includes a thin portion having a thickness smaller than a thickness of the tubular member.

A vibration actuator includes a vibrator including an elastic body and an electro-mechanical energy conversion element; a contact body provided so as to be brought into contact with the vibrator; a flexible printed board configured to feed power to the electro-mechanical energy conversion element; and a temperature detection unit provided on a region of the flexible printed board, in which the flexible printed board and the electro-mechanical conversion element overlap each other.

There is provided a drive controller including a determination part that compares a target stop position of a movable body, which is driven by a piezoelectric actuator driven by a piezoelectric element expanded and contracted in response to an applied voltage, with a real position of the movable body acquired on the basis of a position sensor, and determines whether or not the target stop position matches with the real position, and a drive control part that turns off energization of the piezoelectric actuator when the target stop position matches with the real position while the movable body is being driven by the piezoelectric actuator.

A lens driving device includes: a movable part for accommodating a lens; and an ultrasonic motor having a resonance part configured to move the movable part by motion of the resonance part of the ultrasonic motor. The resonance part has a pair of arms, and is disposed such that only one of the arms is in contact with the movable part.

A camera module is provided. The camera module includes a lens module; a carrier coupled to the lens module, and configured to rotate using an optical axis as a rotation axis; a housing configured to accommodate and support the carrier; and a guide unit disposed between the carrier and the housing, wherein the guide unit includes a ball member that is configured to perform a rolling movement between the carrier and the housing, and a first substrate connected to the lens module, wherein at least a portion of the first substrate is configured to bend as the carrier is rotated.

A vibration actuator capable of adjusting the position of a vibration element with respect to a contact body. The vibration actuator includes a vibration element unit and a contact body capable of relative movement to each other. The vibration element unit includes a first vibration element in contact with the contact body, an urging unit that brings the first vibration element and the contact body into contact with each other with predetermined pressure force, a first holding member that holds the first vibration element, a base, a first supporting member that slidably supports the first holding member in a direction in which the first vibration element is pressed against the contact body, and a first connection member that is rotatably connected to the first supporting member and rotatably connected to the base about an axis parallel to a direction of the relative movement.

A vibration device includes a protective cover, a first cylindrical body, a plate spring, a second cylindrical body, a piezoelectric element, and a vibrating plate. The vibration device further includes a non-equilibrium structure that removes a mass of a portion of or adds a mass to at least one of the protective cover, the first cylindrical body, the plate spring, the second cylindrical body, and the vibrating plate.