In a vibration wave motor disclosed in this specification, at least one straddling member is coupled to a vibration member along the direction of travel of a traveling vibration wave in such a manner as to straddle between two points having a spacing corresponding to (.lambda./2+n.lambda.) (n being an integer including zero), and the straddling member is rotatably coupled to a fixed member at the central position between the two coupling points of the straddling member.
An ultrasonic motor has a stator having a piezoelectric member vibrated by a drive signal, and an elastic member for generating traveling vibration wave in a drive surface thereof upon vibration of the piezoelectric member, a rotor which is urged against the drive surface of the elastic member and is driven by the generated traveling vibration wave, a support member integrally molded on the elastic member, and a fixing member for holding the support member. In the ultrasonic motor, one end face of the support member is formed at the same level as the drive surface or the junction surface of the elastic member, an electrode of the piezoelectric member is grounded through the support member, a plurality of holes are regularly formed in the circumferential direction of the support member, or the support member is fixed to the fixing member by an adhesive, thereby improving drive efficiency.
An ultrasonic motor has a stator and a rotor which is pressure-contacted to be in contact with the stator and is driven by a travelling oscillatory wave. The stator comprises: a second layer having an electromechanical energy conversion element; a first layer having an elastic member to be excited by the electromechanical energy conversion element to generate the travelling oscillatory wave; and a one or more ply third layer between the first and the second layers whose spring modulus is smaller than those of the two layers and which is made of the same material as or different material from those of the two layers.
In an ink drop let jetting method and an apparatus therefor, by setting a printing frequency used when continuous dots are printed to a predetermined value, a stable jetting becomes possible, and jetting speeds and volumes of second ink droplets and subsequent droplets may be prevented from being fluctuated. A frequency of a jet pulse signal applied to an actuator in accordance with a printing command of a plurality of consecutive dots is set to be a reciprocal of the product of a sum (integer +0.5) and the time T in which a pressure wave propagates within an ink chamber in one propagation direction. Thus, it is possible to prevent speeds and volumes of the second ink droplets and subsequent ink droplets from being fluctuated.
A heat-sensitive transfer image-receiving sheet comprising at least one receiving layer containing a polymer latex and at least one heat insulating layer containing a hollow polymer on a support, wherein the polymer latex contained in the receiving layer comprises two or more dyable polymers having different glass transition temperatures.
An ultrasonic motor comprises a rotor and a stator between which a pressurized face-to-face contact is established. The stator includes a longitudinal vibrator for producing a longitudinal thrust in the axial direction thereof and a torsional vibrator for transmitting a torsional thrust to the rotor in response to a longitudinal thrust timely generated by the longitudinal vibrator. The stator is supported by a structure which comprises a ring portion secured to the stator and a plurality of limb portions radially extending from the ring portion. Each of the limb portions has such an effective length and a width that the oscillation frequency of the motor matches the primary resonant frequency of a vibration of the limb portion generated on a plane normal to the axial direction of the stator and has such a thickness that the oscillation frequency matches an intermediate point between adjacent antiresonant frequencies of a vibration of the limb portion generated in the axial direction of the stator.
