摘要:
A vibrator of a vibration wave linear motor comprises two and one driving contacting parts respectively on top and bottom surfaces. A first guide member contacts the two driving contacting parts on the top surface, and both ends of a second guide member are pressed upward by spiral springs, and pressing forces are applied respectively between the driving contacting parts and the first and the second guide members. The three driving contacting parts convert elliptical vibrations, which are generated by applying a voltage to a vibrator unit, into driving force, whereby the vibrator self-runs in a direction indicated by a bidirectional arrow d with reference to the first and the second guide members. the self-running of the vibrator is conveyed, via a pin member and an engaging protruding part, to the lens frame, which then slides.
摘要:
In an ultrasonic vibrator in which ultrasonic elliptical vibration is caused at a friction-projection by the simultaneous generation of a first vibration mode and a second vibration mode in a piezoelectric element, the friction-projection is formed by burning so as to be integrated with the piezoelectric element.
摘要:
An ultrasonic piezoelectric transducer and an ultrasonic actuator for performing enhanced elliptical vibration comprise a first laminated piezoelectric element having a first fixed end, a resonator mounted to the opposite end of the first laminated piezoelectric element, a second laminated piezoelectric element having one end thereof fixedly mounted to the resonator in a direction other than a vibrating direction of the first laminated piezoelectric element, and a load mass fixedly mounted to the opposite end of the second laminated piezoelectric element. This structure permits the enhanced elliptical vibration of the transducer to have a large, controllable amplitude.
摘要:
An actuator apparatus for driving a focus adjusting lens of a focus adjusting mechanism of an endoscope comprises a moving member put in slidable frictional engagement with a base of the endoscope, the moving member having coupling means for coupling with the movable portion within the endoscope, a piezoelectric element coupled to the moving member, the piezoelectric element and the moving member alone constituting a body of the actuator apparatus, and actuator control circuit for causing quick deformation in the piezoelectric element, enabling the piezoelectric element to apply an impulse force to the moving member, thereby moving the moving member against a frictional engagement force acting between the base and the moving member.
摘要:
An electrophotographic apparatus for producing one or more copied images of an original by forming an electrostatic latent image of the original on a photosensitive member whose width is narrower than that of a recording paper, developing the latent image, and transferring the developed image onto the recording paper, the apparatus including a device for removing electric charge from edge portions of the photosensitive member after said transferring but before next succeeding development of said latent image in the course of repeating developments and transferrings of one electrostatic latent image formed on said photosensitive member.
摘要:
An ultrasonic motor, which drives a driven member using an elliptical vibration produced by synthesizing a longitudinal vibrational mode and a flexural vibrational mode as a drive force, is configured as follows. Namely, the ultrasonic motor includes a piezoelectric device, and a feed member feeding the piezoelectric device. An extensional axis of the feed member is set to an axis different from main vibrational axes of the longitudinal vibrational mode and the flexural vibrational mode.
摘要:
With the invention, both a longitudinal vibration mode and a flexural vibration mode are independently detected, or only the longitudinal vibration mode is detected, without using a special device. The invention provides an ultrasonic motor including electromechanical transducers for driving, electromechanical transducers for vibration detection, and an ultrasonic vibrator in which, by supplying two-phase alternating voltages with a predetermined phase difference and predetermined driving frequency to the electromechanical transducers for driving, two different vibration modes are simultaneously generated to produce a substantially elliptical vibration at an output. It is possible to independently detect both the longitudinal vibration mode and the flexural vibration mode with the electromechanical transducers for vibration detection.
摘要:
An ultrasonic motor that is capable of stable driving by preventing uneven rotation of a driven body and maintaining the drive efficiency is provided. The ultrasonic motor includes a plurality of ultrasonic transducers including alternately stacked first piezoelectric elements and second piezoelectric elements, and a control unit for applying the same two-phase driving AC voltages to the plurality of ultrasonic transducers. The ultrasonic motor simultaneously generates longitudinal vibration and flexural vibration at the ultrasonic transducers to generate substantially elliptic vibration at output ends of the ultrasonic transducers and relatively moves the ultrasonic transducers and a driven body in contact with the ultrasonic transducers. The control unit includes a vibration detection circuit that detects the vibrations of the ultrasonic transducers and outputs an average-vibration detection signal, a phase comparator circuit that detects a phase difference between one of the two-phase driving AC voltages applied to the ultrasonic transducers and the average-vibration detection signal, and a frequency control circuit that controls the frequency of the driving AC voltages such that the phase difference detected by the phase comparing part is a predetermined value.
摘要:
A vibrator of a vibration wave linear motor comprises two and one driving contacting parts respectively on top and bottom surfaces. A first guide member contacts the two driving contacting parts on the top surface, and both ends of a second guide member are pressed upward by spiral springs, and pressing forces are applied respectively between the driving contacting parts and the first and the second guide members. The three driving contacting parts convert elliptical vibrations, which are generated by applying a voltage to a vibrator unit, into driving force, whereby the vibrator self-runs in a direction indicated by a bidirectional arrow d with reference to the first and the second guide members. The self-running of the vibrator is conveyed, via a pin member and an engaging protruding part, to the lens frame, which then slides.
摘要:
An ultrasonic transducer in which internal electrodes and piezoelectric elements are alternately layered includes outer electrodes, each being connected to the corresponding internal electrodes. The ultrasonic transducer has a first layered part, a second layered part, a first outer-electrode group, and a second outer-electrode group. The first layered part includes at least the internal electrodes, each being divided in half in a second direction orthogonal to a layering direction, which is a first direction. The second layered part includes at least the internal electrodes, each being divided in half in a third direction orthogonal to the first direction and the second direction. The first outer-electrode group is provided so as to be connected to predetermined internal electrodes in the first layered part. The second outer-electrode group is provided so as to be connected to predetermined internal electrodes in the second layered part.