摘要:
The invention provides a lens transfer device including at least one lens and a lens barrel. The lens barrel has a lens receiving part with the lens arranged in an inner space thereof and an extension extending radially from an outer surface of the lens receiving part. An actuator has a body and an output member at a leading end of the actuator to contact the extension, and is adapted to expand/contract and bend in response to an external supply voltage to provide a driving force necessary for transfer of the lens barrel through the output member. A pressing member has a free end contacting a rear end of the actuator to force the actuator against the extension, and a guide guides the transfer of the lens barrel along an optical axis.
摘要:
The present invention relates to a lens driving device includes a lens receiving part with a lens disposed therein, having first and second extension parts formed at opposed sides in a predetermined interval from each other. The lens driving device also includes an actuator having a body between the first and second extension parts. The actuator body has first and second output members contacting the first and second extension parts of the lens receiving part at opposed ends thereof, and thereby expands, contracts and bends when power is applied. The lens driving device also includes a preload member compressing the first and second extension parts against the actuator body to maintain a status of pressed contact. The lens driving device further includes a guide part for guiding the movement of the lens receiving part in an optical axis direction.
摘要:
A piezoelectric ultrasonic motor includes a piezoelectric stator including a metal tube with an inner space and piezoelectric elements mounted on the outer circumference of the metal tube, a rotary shaft including a rotation bar inserted into the inner space of the metal tube, and a rotation member provided around the rotation bar in contact with the piezoelectric stator. The piezoelectric stator strains with an electric field applied thereto, and the rotation member rotates in response to the strain of the piezoelectric stator. A power transmission member is provided at one portion of the rotation bar to transmit the rotation of the rotation member to an object to be transported. With face contact the motor achieves stable actuation together with enhanced force and sufficient strain, and a flexibility to be applied to various apparatuses such as a camera module.
摘要:
There is provided a flat type piezoelectric ultrasonic motor for generating a rotation force to a rotor by ultrasonic vibrations. In the piezoelectric ultrasonic motor, a vibrator is formed of elastic material at a given size, a plurality of piezoelectric plates are attached on the vibrator, a rotor is drivingly connected to the vibrator thereby to be rotated, and a power source unit applies driving voltages to the piezoelectric plates. The piezoelectric plates are arranged on quartered surface areas of the vibrator in such a way that longitudinal axes of neighboring piezoelectric plates form a given angle therebetween and opposing piezoelectric plates have opposite polarizations, and the power source unit applies alternating driving voltages to the piezoelectric plates thereby to make the rotor rotated, thereby making it possible to simplify the piezoelectric plates' shape, minimize its size and enhance its driving efficiency.
摘要:
A piezoelectric motor for generating an elliptic motion by adding a longitudinal vibration to a bending-direction vibration is provided. The piezoelectric motor includes a piezoelectric member which generates a first vibration mode and a second vibration mode simultaneously by an applied power and a frictional member of which a portion is insertedly attached into a concave portion indentedly formed on one side of the piezoelectric member, wherein the frictional member is in an elliptic motion by the vibration generated by the piezoelectric member, so that an influence of the attachment of the frictional member to a resonance frequency can be minimized. Accordingly, a driving efficiency of the piezoelectric motor can be improved. In addition, attachment strength of the frictional member can be improved.
摘要:
The invention relates to a piezoelectric vibrator easily manufactured and mass-produced. The piezoelectric vibrator includes the piezoelectric bar having a plurality of piezoelectric plates alternately stacked and a plurality of vibration sectors divided vertically and horizontally with respect to the direction in which the piezoelectric plates are stacked. Electrode terminals are formed on each of surface regions of the piezoelectric plate, divided in a longitudinal direction thereof, and jump terminals corresponding to electrode terminals are formed on a surface of an adjacent one of the piezoelectric plates. On side surfaces of the piezoelectric plates, a plurality of side electrodes are formed, connecting the electrode terminals and the corresponding jump terminals to power the vibration sectors, by which a pair of the vibration sectors diagonally disposed from each other are simultaneously powered. The piezoelectric vibrator is small and easily manufactured and mass-produced with a simple structure.
摘要:
The present invention relates to a ceramic tube type ultrasonic motor having a stator including a tube-type elastic body that is formed of a ceramic material; and a plurality of piezoelectric diaphragms that are attached on the outer peripheral surface of the elastic body in a longitudinal direction thereof and to which voltages having a phase difference are respectively applied and a rotor that is rotated by the friction with the elastic body flexurally vibrating due to the voltages applied to the plurality of piezoelectric diaphragms.
摘要:
The present invention provides a piezoelectric ultrasonic motor driver which can perform self-oscillation, adjust the rotational direction of the motor, and be easy to manufacture. The motor includes a metal body having a desired shape; a plurality of piezoelectric plates attached to surfaces of the metal body, contracted and expanded to rotate the metal body; a self-oscillation unit for oscillating at an electromechanical frequency of the piezoelectric plates an electrical signal; and a delay unit for delaying an oscillation signal of the self-oscillation unit in phase by 90 or −90 degrees according to a desired rotational direction.
摘要:
The present invention relates to a lens driving device, more particularly, capable of adjusting an effective focal length determined by the relative distance of lenses in an optical device having a zooming function. In the lens driving device, a barrel unit has an internal space for containing a lens therein and a guide slot for allowing forward and backward movement of the lens through rotation of the barrel unit. A ring-shaped piezoelectric actuator unit is arranged adjacent to the barrel unit for being contracted or expanded radially in response to an external input signal. A drive member is mounted on the piezoelectric actuator unit and having a plurality of segments projected toward the barrel unit to contact the same.
摘要:
A lens driving device including: a lens barrel having at least one lens therein; an actuator having a tip friction member provided at a leading end of a body thereof to be in contact with a friction member of the lens barrel, the actuator being flexed and bent upon application of power to provide a driving force necessary for driving the lens barrel in an optical axis direction; a preload member compressing the actuator against the lens barrel to keep the friction member and the tip friction member in contact with each other; and a guiding part guiding the lens barrel to move in the optical axis direction, wherein the friction member and the tip friction member are formed of a super-hard alloy.