Showing papers on "Bimorph published in 1979"
TL;DR: In this paper, a flexible mirror constructed from plates of glass and lead zirconium titanate (PZT) piezoelectric ceramic glued together is described, which is activated by a series of electrodes on the reverse side.
Abstract: We describe a flexible mirror constructed from plates of glass and lead zirconium titanate (PZT) piezoelectric ceramic glued together. It is activated by a series of electrodes on the reverse side. An equation of state is derived, giving the surface profile as a function of the electrode voltages, and the experimental behavior of the mirror is illustrated.
104 citations
TL;DR: An ultrasonic transducer comprises a composite vibrator, which comprises a bimorph vibrator and a resin made additional resonator of a frustum of a cone provided at the central portion of the bimomorph vibrator as discussed by the authors.
Abstract: An ultrasonic transducer comprises a composite vibrator, which comprises a bimorph vibrator and a resin made additional resonator of a frustum of a cone provided at the central portion of the bimorph vibrator. The composite vibrator gives rise to the first resonance by a piston vibration mode at the lower frequency region and the second resonance by a bending vibration mode at the higher frequency region as compared with the central frequency. The composite vibrator is fixed to an insulating base through a ring shaped elastic member, whereby a resonance characteristic by virtue of a piston vibration mode is enhanced. Preferably a protrusion of the diameter slightly smaller than the nodal circle by virtue of a bending vibration mode is formed on the transducing surface of the resin made additional resonator of a frustum of a cone. The protrusion serves to reduce the quality factor of the second resonance by virtue of a bending vibration mode.
43 citations
TL;DR: By adding mechanical advantage to a bender bimorph beam scanner, its angular excursion can be greatly increased with little loss in frequency response as discussed by the authors, and several alternative designs are considered.
Abstract: By adding mechanical advantage to a bender bimorph beam scanner, its angular excursion can be greatly increased with little loss in frequency response. Several alternative designs are considered. Because of their simplicity, infinite life, and improved performance, these piezoelectric bimorph beam scanners are viable alternatives to electromagnetic scanners.
28 citations
Patent•
06 Feb 1979
TL;DR: In this paper, the diaphragm plates 3a∼3c which open and close according to the volume of incident rays are distributed at mobile part 6 between object lens 1 and main lens 2 provided on the incident ray path.
Abstract: PURPOSE: To realize the miniature and light-weight automatic stop-down device by installing the diaphragm driving means which gives the control to the aperture area of the diaphragm plate in accordance with the deviation of the piezoelectric element plus the voltage control means which controls the voltage applied to the piezoelectric element in accordance with the volume of incident rays CONSTITUTION: Diaphragm plates 3a∼3c which open and close according to the volume of incident rays are distributed at mobile part 6 between object lens 1 and main lens 2 provided on the incident ray path At the same time, bimorph 13 which converts the electric energy into the mechanical energy is connected to axle 10 via connection component 11, and part 6 is connected to the other side of component 11 Then part 6 is controlled by the output of bimorph 13 in order to control the aperture areas of plates 3a∼3c In addition, secondary windings 15b and 15b 1 of the power transformer 15 which supplies the deflecting acceleration and the power for focusing are connected to the electrodes of bimorph 13 Thus the apertures of plates 3a∼3c are controlled by the differential voltage between winding 15b and 15b 1 COPYRIGHT: (C)1980,JPO&Japio
12 citations
Patent•
04 Sep 1979TL;DR: In this article, a light deflector with a bimorphic backplate combined with an array of spherical linear piezoelectric actuators for supporting a mirrored faceplate for electrically controlled changes in the spherical radius and focal length was presented.
Abstract: A light deflector apparatus comprising a bimorph piezoelectric backplate combined with an array of spherical linear piezoelectric actuators for supporting a mirrored faceplate for electrically controlled changes in the spherical radius and the focal length as well as localized variations on the surface of the mirror. The bimorph backplate forms part of a supporting structure including a bellows which, with the backplate and faceplate, form a chamber to contain the spherical actuators and which is partially evacuated to hold the faceplate in engagement with the spherical actuators.
9 citations
Patent•
31 Jul 1979
TL;DR: In this paper, a head support structure has an element 12, which can be deflected in accordance with the voltage applied, such as bimorph, which is composed of upper and lower layers 14 and 16 and is equipped with electrodes 18, 20, 22 and 24.
Abstract: PURPOSE:To simultaneously vary the azimus positional condition and displacement positional condition of a head by deflecting a head supporting structure by the voltage impressed. CONSTITUTION:A head support structure 10 has an element 12, which can be deflected in accordance with the voltage applied, such as bimorph. This bimorph 12 is composed of upper and lower layers 14 and 16 and is equipped with electrodes 18, 20, 22 and 24. When different voltages A and B are applied to those electrodes, the free end of the structure 10 is turned counter-clockwise or clockwise so that the head carried on the free end of the structure 10 has such an azimus as accords to the rotations of the free end of the structure. Moreover, if the electrodes 20 and 22 are grounded to the earth whereas the electrodes 18 and 24 are supplied with the voltages A and B, it is possible to deflect the head widthwise of the track.
7 citations
Patent•
10 Apr 1979
TL;DR: In this article, a bimorph type piezoelectric vibrator is used to obtain a miniature, lightweight and low cost actuator by using a BIMOVE vibrator of good follow-up control characteristics which comprises laminating piezolectric materials on one or both surfaces symmetrical to the center in the longitudinal direction of an elastic metal plate and mounting braking plates at both ends.
Abstract: PURPOSE:To obtain a miniature, lightweight and low cost actuator by using a bimorph type piezoelectric vibrator of good follow-up control characteristics which comprises laminating piezoelectric materials on one or both surfaces symmetrical to the center in the longitudinal direction of an elastic metal plate and mounting braking plates at both ends. CONSTITUTION:The piezoelectric type actuator consists of a magnetic head assembly 6 and a bimorph type piezoelectric vibrating element 14. The assembly 6 comprises a slider 8 which holds an integrated head 7 including a multiplicity of magnetic head elements and floats in the opposing face of a magnetic disc 1, a gimbal spring 9 for holding the same, a load spring 10 which maintains the floating quantity of the slider constant in balance with the buoyancy produced in the slider and a support arm 11 for the spring 9. The vibrator 14 comprises laminating piezoelectric materials 13 on one or both surfaces of an elastic metal plate 12, mounting braking plates 15 at both ends and fixing to a stand 14 by means of holders 16, 17 in its central part. The braking elements 20 are added to the outside and the braking plates 15 are inserted into the gaps of the magnetic circuits consisting of permanent magnets 18 and yokes 19, whereby braking effect is obtained.
6 citations
11 Jul 1979
TL;DR: In this article, discrete bimorph actuators were designed at Itek for a deformable mirror, which has a dilatation sensitivity of 6 microns at 1.5 KV.
Abstract: Discrete, bimorph actuators have been designed at Itek for a deformable mirror, which has a dilatation sensitivity of 6 microns at 1.5 KV. The bimorph actuators, mechanically designed to accommodate flexibility while bending, provide surface deformation, which depends upon the actuator length and faceplate stiffness. Mechanical resonances have been measured at frequencies well above bandwidths required for wavefront correction. Life test data indicates that less than λ/5 PP wavefront change occurred after exercising the bimorph device for 100 hours at 6 microns.© (1979) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
5 citations
Patent•
23 Mar 1979
TL;DR: In this paper, a bimorph element is prepared at low cost, with a process of assembly not required, by such means that after punching a raw sheet of layer-built type piezo-electric ceramic, having a construction of filling density such as denseness-sparseness-denseness, into a desired shape, a firing be processed, then followed by an electrode construction.
Abstract: PURPOSE:To prepare a bimorph element at low cost, with a process of assembly not required, by such means that after punching a raw sheet of layer-built type piezo-electric ceramic, having a construction of filling density such as denseness-sparseness-denseness, into a desired shape, a firing be processed, then followed by a construction of electrode.
5 citations
Patent•
28 May 1979
TL;DR: An improved drive circuitry for controlling the deflection of a bimorph comprising a pair of electrically poled piezo-ceramic elements bonded to a common substrate is disclosed in this article.
Abstract: An improved drive circuitry for controlling the deflection of a bimorph comprising a pair of electrically poled piezo-ceramic elements bonded to a common substrate is disclosed which applies deflection voltage in a manner whereby the polarity is always in the poling direction of each of the elements so that depolarization of the piezo-ceramic elements does not occur. The circuitry applies a common polarity D. C. biasing voltage to both of the piezo-ceramic elements of the bimorph and also applies oppositely phased A. C. deflection signals to the respective piezo-ceramic elements.
2 citations
Patent•
18 Apr 1979
TL;DR: In this paper, a bimorph piezoelectric vibrator is supported to a stand by way of the insulated knife edges holders at the two fulcrames A, B symmetrical to the center in the lengthwise direction of an elastic diaphragm.
Abstract: PURPOSE:To achieve the reduction in size and weight of the actuator which performs high-density and high-speed locating by performing such thing as vibrating the elastic diaphragm supporting bimorph type piezoelectric vibrator symmetrically to the center at high frequencies and relatively large amplitudes. CONSTITUTION:A bimorph piezoelectric vibrator 14 is supported to a stand 18 by way of the insulated knife edges holders 16, 17 at the two fulcrames A, B symmetrical to the center in the lengthwise direction of an elastic diaphragm 12 and comprises affixing three sets of bimorph type piezoelectrics 13a having been bored to the diaphragm 12. Braking plates 15, 15 are provided to its both ends. This cnstitutin causes the vibrator 14 to be vibrated at high frequencies by bimorph type piezoelectric elements 13a... and at relatively large amplitudes by the composite displacements by the deflections centering at the fulcrums A, B and the deflections of the elements 13a... and at the same time to be vibrated stably by way of the braking plates 15. Hence, high-speed high-density track locating by the magnetic head 6 which is connected to the vibrator 14 by a gimbal spring 9, etc. and whose gap width is parallel with the vibrating direction is accomplished and the miniature and lightweight device of not requiring voice coils, etc. may be provided.
Patent•
21 Jul 1979
TL;DR: In this paper, an electro-mechanical transducer is used to improve response characteristics by detecting the displacement of an electromechanically transducerer, applying the signal thereof and an envelope signal to a multiplier and adding the output thereof to the signal which drives the transducers, whereby the delay required for detection of the error signal is elminated and responsiveness is improved.
Abstract: PURPOSE:To improve response characteristics by detecting the displacement of an electro-mechanical transducer, applying the signal thereof and an envelope signal to a multiplier and adding the output thereof to the signal which drives the electro- mechanical transducer. CONSTITUTION:The device is so constituted that the drums 18 and 19 of a head drum device 17 rotate by way of a slit 20, that a bimorph plate 2 is mounted to the bottom of the drum 18, that a reproduction amplifier 23 for the head 1 and an amplifier 22 for strain gauge 21 detecting the deflection of the bimorph plate 2 are provided and that the signal containing only the information of tracking errors having been removed of excitation frequency components and unnecessary frequency components is obtained by inputting the output signals of these to a multiplier 38 via filters 37, 39 and this signal added with the signal of the oscillator 6 is supplied to the bimorph plate 2, whereby the delay required for detection of the error signal is elminated and responsiveness is improved.
Patent•
30 Jun 1979
TL;DR: In this article, a dynamic type vibrator and an electrostrictive type bimorph vibrator were used to remove disturbing sound waves other than the target bearing by using two kinds of pressure gradient type transducers.
Abstract: PURPOSE:To remove disturbing sound waves other than the target bearing by using two kinds of pressure gradient type transducers. CONSTITUTION:A dynamic type vibrator 1 as a pressure gradient type transducer which electromagnetically performs electro-mechanical conversion and electrostrictive type bimorph vibrators 2a, 2b as pressure gradient type transducers which electrostatically perform electro-mechanical conversion are contained together with a medium of good sound wave transmittivity in a case of good sound wave transmittivity.Then the electric signal of the dynamic type vibrator 1 from output terminal 4a is removed of disturbing sound waves other than the target bearing as the electric signal being the difference of the two electrostrictive type bimorph vibrators 2a, 2b are outputted from output terminal 5a and at the same time the phase comparison for the purpose of bearing determination without phase shifter is made possible.
TL;DR: The property that the bimorph deformation is generated along a quadratic curve is used to form a variable quadratics mirror surface so that an effective dynamic-focusing mirror system is realized.
Abstract: The property that the bimorph deformation is generated along a quadratic curve is used to form a variable quadratic mirror surface so that an effective dynamic-focusing mirror system is realized. The effectiveness and the limitations of the method are examined numerically with some comparisons with the COAT system. A typical simple dynamic-focusing mirror system is constructed using this method. The results of numerical analysis and experiment show the usefulness of the method for dynamic focusing of laser beams.