Showing papers on "Bimorph published in 1988"

Graphics display using biomorphs

Abstract: A bimorph using ultraviolet setting glue to laminate a piezoelectric film structure, having etched-back metalization patterns on the surfaces of the piezoelectric film The bimorph is used in a bimorph light modulator including a substrate on which fiber optic input and output light guides are mounted A gap between the light guides serve as an optical coupling A bimorph is affixed to the substrate with a shutter attached to one end thereof and positioned within the gap for blocking the light coupling when the bimorph is in the unenergized state When the bimorph is energized, it pulls the shutter out of the gap, thereby allowing light coupling Top and bottom stops are used to limit the bimorph movement to damp resonant vibrations and improve on and off times Viscous air damping is used to eliminate or minimize bounce of the top and bottom stops and to help damp resonant vibration An array of the bimorphs may be utilized for providing a video or other display, with electrode connections being made to the bimorphs by means of conductors which contact the bimorph electrodes at small surface areas, with the conductors being attached to circuit boards carrying signals for operating the bimorph array The optical fibers may be coupled to different light sources and filters to provide color images, and groups of optical fibers may be arranged to form pixels for providing a broad range of intensities

High stability bimorph scanning tunneling microscope

Abstract: A novel scanning tunneling microscope (STM) is described which is constructed almost entirely of one metal e.g. aluminum and uses bimorph piezoelectric disks as the x, y, z drive elements. The design uses a simple, rugged tirpod configuration for the fine motion drive arms. Coarse motion of the sample, which is mounted on an aluminum holder, is achieved by pushing, or pulling, with a piezoelectric louse. Differential thermal expansion effects are avoided by design, to first order, and the resulting drift is ≦0.5 Å per minute after only a short warm-up period. It is easy to build and operate, and has good immunity to mechanical vibrations.

High impedance piezoelectric transducer

Abstract: An improved bimorph piezoelectric transducer provides higher input impedance and allows operation at higher operating voltages. First and second piezoelectric elements have opposing electrode patterns which define a plurality of capacitors connected in series. This allows such transducers to be directly connected to high voltage audio distribution systems without the need for an impedance matching circuit.

Piezoelectic relay module to be utilized in an appliance or the like

Abstract: A piezoelectric relay module having a plurality of relays of different load ratings is disclosed. Each relay is constructed from a portion of a single bimorph structure by cutting the bimorph structure to form bimorph actuators. The widths of the various bimorph actuators is varied to provide the different load ratings.

Bimorph electro optic light modulator

Abstract: There is disclosed herein a bimorph using ultraviolet setting glue to laminate the structure and having etched back metalization patterns on the surfaces of the piezoelectric film used to make the bimorph to minimize the possibility of shorting and to eliminate electrostatic pinning and to increase the mechanical reliability and lifetimes of the electrical contacts. Also disclosed is a method for making the bimorph and a method for registering the bimorph on a light modulator. There is also disclosed a bimorph light modulator consisting of a substrate on which there is attached an fiber optic input light guide and a fiber optic output light guide. There is a gap between these light guides through which light passes as it is coupled between said light guides. A bimorph is affixed to the substrate with a shutter attached to one end of the bimorph such that the shutter is registered in the gap so as to block light coupling when the bimorph is in the unenergized state. When the bimorph is subjected to electrical fields of the proper polarity, the bimorph bends thereby pulling the shutter out of the gap and allowing light coupling. Top and bottom stops are used to limit the bimorph movement to damp resonant vibrations and improve on and off times. Viscous air damping is used to eliminate or minimize bounce of the top and bottom stops and to help damp resonant vibration.

Latching piezoelectric relay

Abstract: An improved piezoelectric relay based on a bimorph actuator is described. The relay maintains its state in the absence of power thereto. The relay operates by changing the residual polarization of the piezoelectric strips used in the bimorph actuator.

Imaging of tip‐sample compliance in STM

Abstract: SUMMARY An STM was built, in which the substrate is mounted on a piezoelectric bimorph. The compliance of the tip-surface contact region is measured by modulating the vertical position of the tip and detecting the induced deflection of the bimorph. Tip-surface compliances between 5 and 200 N/m were measured during STM operation. It is possible to use the compliance signal for operating the microscope's feedback loop. Stable feedback loop operation can be achieved for tip-surface distances up to about 200 nm. By operating the microscope in this constant compliance mode, surfaces of arbitrary conductance can be imaged. For conductive surfaces the tunnelling current can be recorded simultaneously. On a Nb3Sn film conducting and isolating patches were detected using this method.

Imaging of laser generated surface ripples on silicon

Abstract: A scanning tunneling microscope is presented which is able to supply image data from the micrometer range down to atomic scales. By laser annealing corrugations can be generated on semiconductor surfaces with periodicities close to 1 μm. A bimorph scanner has been used to obtain large‐scale topographic maps of these structures.

Piezoelectric sounding body

Abstract: PURPOSE:To obtain a sounding body high in sound pressure level by making the thickness in the boundary of the fixed support part and the free part of the piezoelectric bimorph type sounding body or in a part adjacent thereto thinner than a bimorph forming part. CONSTITUTION:An electrode 14 taken out in three directions different from an electrode 13 in direction is added to piezoelectric material green sheets 11, 12. The sheet 11 is punched at the position of R2=50-80 % of R1 with respect to the position of the radius R1 on which a pheripheral fixed body 15 is formed, aligned with the center of the sheet 12 and temporarily fixed under pressure. On the electrode end of the sheet 11, the electrode 14 of the sheet 12, a connecting through hole 21, and a connecting electrode 22 are disposed. A peeling film 31 and a spacer 32 are together laminated, pressed to obtain an integrated material with the peripheral fixed body 15. The piezoelectric sounding body is formed via removal of a binder and burning. According to this constitution, the boundary part of the free part and the fixed body part is made only of one layer and thinned, the displacement in a diaphragm is enlarged and the sounding body high in sound pressure level is obtained.

Gas laser having a piezoelectric fan

Abstract: A piezoelectric fan is comprised of two counter-oscillating flexible blades that are driven at resonance by a bimorph comprised of two piezoceramic bending elements. The fan is provided within the flow duct of a circulating gas laser. The operation of the piezoelectric fan serves to create a flow of a laser gas medium in a desired direction through the flow duct, thereby replenishing the gas medium between a pair of laser electrodes. The fan has no wearing elements, such as bearings, and requires no bearing lubricant resulting in the elimination of lubricant hydrocarbon and bearing particulate contamination of the laser gas medium.

Diaphragm apparatus for camera

Abstract: A diaphragm apparatus is disclosed including a piezoelectric actuator of bimorph type. A drive circuit associated with the actuator applies a voltage corresponding to a diaphragm aperture which is calculated in accordance with a photometric value to the actuator to produce a displacement thereof, which is transmitted through a diaphragm operating member to open or close diaphragm blades so as to control a diaphragm aperture. The drive circuit applies a reset voltage which resets the diaphragm blades to a predetermined reset condition, to the piezoelectric actuator, and after the resetting operation, it applies a voltage corresponding to a given diaphragm aperture to the piezoelectric actuator.

Manufacture of piezoelectric polymeric sheet with bimorph structure

Abstract: PURPOSE:To increase a yield by forming conductive films on one side of two films made of a polarized piezoelectric polymeric material and then adhering the side surfaces to each other by an adhesive. CONSTITUTION:Two films 2 and 3 made of a piezoelectric polymeric material are prepared and polarized by a high electric field. Then, conductive coating 6 are deposited on one side of the two polarlized films 2 and 3 by evaporation. Then, these films are bonded together with an adhesive 9 in such a manner that their coated faces are in contact with each other. Thus, by performing the polarization processing in an initial stage, if a dielectric breakdown occurs during the polarization processing, the defective unit is discarded before it is carried to the next process, so that a yield can be improved. Further, since the adhesive is used for adhesion, a flexibility proper to the piezoelectric polymeric material is not damaged.

Device for driving shutter

Abstract: In a device for driving a shutter having a bimorph element displaceable or deformable by the application of a voltage thereto, and so constructed as to open and close the shutter by using the displacing or deforming effect of the bimorph element, the device comprises a first switching means for short-circuiting the bimorph element at a usual time and a second switching means for releasing the bimorph element from the short-circuited state caused by the first switching means only at the time of opening the shutter and at the same time charging the bimorph element with a voltage from an electric source for the bimorph element, so that the shutter can be surely closed at the usual time.

Device for the presentation of Braille

Abstract: By supplementing the conventional bimorph bending strip with a mechanically stable metal or non-metal intermediate layer, which can be used for coupling the tracer pin (feeler), it is made possible to move the tracer pin through the action of the force of the actuator in two directions. An appropriate design of the actuator bearing increases the service life.

Shock preventing apparatus

Abstract: In a vibration preventing apparatus, there are provided a supporting plate on which an object to be supported is mounted; and a member fixed on the supporting plate, for supporting the supporting plate. In this apparatus, a piezoelectric effect element, to which electrodes a resistor is connected, is attached to a surface of the supporting plate. This piezoelectric effect element is a bimorph.

Objective lens driver

Abstract: PURPOSE:To attain small sized and thin profile optical pickup by providing a focus adjusting piezoelectric element and a track adjusting piezoelectric element linearly between a support member for an objective lens and a stationary member. CONSTITUTION:The objective lens 21 and a holder 23 including a support cylinder 22 are supported by the stationary member 26 via two piezoelectric elements (bimorph) 27, 28 connected and arranged linearly at an upper position from the face of the base 25. The voltage impressed state to both the piezoelectric elements 27, 28 is controlled to adjust the focus and track of the objective lens 21. The height of the entire device is lowered to miniature the device.

Loading mechanism for floating head

Abstract: PURPOSE:To perform a stable loading and to improve a reliability by connecting a negative pressure floating head slider to the end of a magnetic head attaching arm through a bimorph piezoelectric element. CONSTITUTION:At the time of rotating a magnetic recording medium 6, a voltage is impressed to a pair of bimorph piezoelectric elements 2 attached between the magnetic head attaching arm 1 and a supporting spring 4. The elements 2 are deformed so as to approach the negative pressure floating head slider 5 to the surface of the medium in parallel. Therefore, the slider 5 can be moved to the surface of the medium 6 with the parallel state maintained to execute the stable loading. Accordingly, according to the use of a self loading mechanism of an actuator mechanism and a negative pressure floating head, the floating head can be started and stopped to improve a reliability.

Control of spatial characteristics of excimer laser radiation by an intracavity controlled mirror

Abstract: An experimental study was made of intracavity control of the spatial structure of excimer laser radiation with the aid of a semipassive bimorph mirror

Piezo-electric bimorph element

Abstract: PURPOSE:To manufacture a piezo-electric actuator in high reliability due to easy manufacture eliminating the bonding process by a method wherein the polarization levels of two phases are differentiated to make the piezo-electric constant different by two ceramics bordered on a central line having respectively different dielectric constant ratios due to the difference in the dielectric constant of the two ceramic layers. CONSTITUTION:One composition of piezo-electric ceramics is selected from a part high in dielectric constant and high in electromechanical bonding coefficient as well as another part of the same level of dielectric constant or exceeding the same but of a low electromechanical bonding coefficient. A compound laminated layer ceramics sheet can be manufactured by laminating two component sheets of this powder thermal pressure-fixed in specified thickness and size as well as stamping in rectangular shape and firing for several hours. Electrodes are formed on both surfaces of this compound laminated sheet by firing-finish silver paste, etc., and then the space between electrodes is impressed with DC current at specified temperature to be polarization-processed. The piezo-electric ceramics layers 1.2 of different dielectric constant are mutually bonded to form electrodes 3 on upper and lower surfaces as a fundamental structure with one end thereof fixed by fixtures 4, 4 for application. Thus, respective electrodes 3 connected to lead terminals 5 are impressed with specified voltage.

Piezoelectric acceleration sensor

Abstract: PURPOSE:To eliminate the temperature dependency of sensitivity and to detect acceleration with high accuracy by deflecting a bimorph structure element according to the acceleration to be detected, and adding the release voltage of a piezoelectric element to the output of short-circuit charges. CONSTITUTION:Two piezoelectric elements 1a and 1b are arranged on a metallic plate 2 to constitute the bimorph structure element, which is supported by a fixing member 3. When the fixing member 3 is loaded with the acceleration, the bimorph element deflects and the piezoelectric elements 1a and 1b generates an electric signal corresponding to the deflection. The signal of the piezoelectric signal 1a is inputted to a voltage amplifier 4 to generate an output proportional to the release voltage of the piezoelectric element, and the signal of the piezoe lectric element 1b is inputted to a charge amplifier 5 to generate an output proportional to short-circuit charges of the piezoelectric element. Then an adder 6 adds the release voltage and the electric signal of short-circuit charges to detect the acceleration. Then an electric signal proportional to the release voltage and an electric signal proportional to the short-circuit charges are added, so the temperature variation of material characteristics of the piezoelec tric elements is canceled and the acceleration is accurately detected.

Piezo-electric bimorph element

Abstract: PURPOSE:To enable the carrier speed to exceed the reference value easily subject to minimum fluctuation by a method wherein an intermediate plate is made of SK steel containing carbon to be hardened. CONSTITUTION:An intermediate plate 1 made of SK steel containing carbon to be hardened shall exceed Rockwell hardness HRC 40 for the better while HRC 50 for the best. Through these procedures, the carrier speed of parts feeder items used as an oscillation source of piezo-electric bimorph element can be accelerated markedly simultaneously minimizing the relative fluctuation in the carrier speed to the load fluctuation of a carrier driven at specified voltage furthermore the carrier speed of parts feeder can exceed the preferable required value exceeding 5 m/min reversely if this value is specified as reference value, any applied voltage can be reduced lower than conventional value.

Piezoelectric displacement element

Abstract: PURPOSE:To perform a large rotary angle displacement generating mechanism having a small size and a high speed response possibility by providing a plate thickness step on the opposed side of piezoelectric substrates of both sides split by a slit, forming electrodes on four surfaces of the substrate in thicknesswise direction, and disposing a shim on one end face of thicknesswise direction CONSTITUTION:A basic piezoelectric element is formed pi-shape as a whole configuration to have a structure having thicknesswise difference in the deflection displacing direction of a piezoelectric element 1, electrodes 2a, 2b are formed on both side surfaces of the element 1 in thicknesswise direction, and a reinforcing shim 3 is bonded to one side of the electrode 2b Further, a plurality of basic piezoelectric elements are bonded in zigzag shape through the shim 3 in a laminated structure That is, a unimorph deformed in deflection is structured in a bimorph type, and positive and negative voltages are applied in zigzag to the deflection deforming sections of the respective bimorphs to generate normal and reverse deflection deformations alternately in laminating direction to provide a movable mechanism having small size, high speed and low power consumption

Piezo-electric actuator

Abstract: PURPOSE: To enable favorable application to a small and thin device and to enable manufacture at low cost, by a method wherein a spring member and a piezo-electric element of bimorph structure are combined, and contact portion of the spring member is moved in elliptic motion. CONSTITUTION:A spring member 7 is provided on center portion with a contact portion 10 projecting to contact with a drive object, and on both ends with two legs 11, 12 bent in acute angle to cross to each other, and top end of the two legs 11, 12 is fixed to a stationary portion. Piezo-electric elements 13, 14 of bimorph structure are contacted with the two legs 11, 12 of the spring member 7, respectively. Voltage of prescribed polarity is selectively applied to these piezo-electric elements 13, 14, thereby the drive object is moved.

Floating head mechanism

Abstract: PURPOSE:To attain the start/stop of a floating head without using the CSS system by using an actuator mechanism comprising a couple of bimorph piezoelectric elements formed on a thin plate beam structure load beam together with a self loading mechanism possessed in a negative pressure floating head. CONSTITUTION:The thin plate beam structure load beam 1 with a piezoelectric element 5 adhered thereto is effectively of a couple of bimorph structures and since the tips are coupled by a binder 4, the assembly comprising a negative pressure utilizing floating head slider 3 and a tougue gimbal spring 2 fitted to a binder 4 is displaced in parallel with a recording medium face 6. Thus, accessing the recording medium face 6, the slider 3 is moved while keeping the state in parallel with the surface of the recording medium 6. Thus, the start/stop is applied to/from the recording medium without employing the contact start/stop (CSS) and excellent record/reproduction is attained.

Connecting device for optical fiber core

Abstract: PURPOSE:To align individual core conductors with high accuracy by driving and controlling a bimorph piezoelectric element according to axis deviation measured by an axis deviation measuring means and minimizing the axis deviation between individual core conductors CONSTITUTION:An optical fiber core connecting device consists of a V-groove substrate 12 which holds the core conductors 1A of optical fibers, the bimorph piezoelectric element 13, an axis deviation quantity measuring instrument 16, a controller 17, and an amplifier 18 which amplifies the signal from the controller 17 Then the instrument 16 measures the quantity of the axis deviation between the tips of the core conductors A; when the axis deviation is comparatively large the elements 13 provided to both sides of V groove 11 of the substrate 12 are moved finely to perform control and when the axis deviation is not so large, the core conductor 1A on one side is moved finely while the core conductor 1A on the other side is held as it is When a fine movement adjustment is made, the element 13 on one side of the V-groove 11 where a core conductor 1A to be adjusted is controlled according to information regarding to the axis deviation fed back to a controller 17 so that the axis deviation is minimum

Head positioning mechanism in magnetic disk storage device

Abstract: PURPOSE:To attain high speed accessing by providing the 1st head positioning actuator using a stepping motor as a drive source and the 2nd head positioning actuator mounted on the 1st actuator and using a piezoelectric substance as its drive source. CONSTITUTION:The 2nd head positioning actuator 2 exclusive for microstep is mounted on a swing arm 1 being a component of the 1st head positioning actuator. The 2nd head positioning actuator 2 consists of an asymmetrical bimorph 3 and an Eden spring extension mechanism 4. When a tip of the asymmetrical bimorph 3 is deflected to a fixed edge, the quantity of deflection is expanded by the Eden spring expansion mechanism 4 without friction and play and a head assembly 13 fixed by a screw 10 via a spacer 9 is moved nearly straightforward in a direction of arrow. Thus, the linear movement of the head assembly 13 causes each head to be moved straightforward simultaneously.

Camera having bimorph driving element

Abstract: PURPOSE:To exactly control driving of a shutter and a photographic lens by operating a driving part by impressing a prescribed voltage to a bimorph driving element, impressing a voltage reverse to the prescribed voltage after the operation, and stopping the reverse voltage, when a reset of the driving part to its initial position has been detected. CONSTITUTION:For instance, in a lens driving circuit, a voltage Va corresponding to the displacement quantity required for feeding a ratchet is accumulated in a capacitor C5, and also, a voltage Vb required for resetting a lens to its initial position is accumulated in a capacitor C4. In this state, when a transistor Tr24 is turned 'ON', the voltage Va which has been accumulated in the capacitor C5 is impressed to a bimorph driving element Bi2, and the bimorph driving element Bi2 is displaced in order to driving a lens for focusing. Subsequently, this transistor Tr24 is turned 'OFF' once, and also, a transistor Tr23 is turned 'ON', and to the bimorph driving element Bi2, the voltage Vb which has been accumulated in the capacitor C4 is applied in the reverse direction, and the bimorph driving element Bi2 is reset to its initial position.

Two-dimensional infrared sensor

Abstract: PURPOSE:To reduce the size and the weight of a two-dimensional infrared sensor without using a rotational driving system, such as a motor, by providing a modulating plate provided with slits in proximity to the sensor and vibrating the modulating plate. CONSTITUTION:A modulating plate 12 and a two-dimensional infrared sensor 11 are proximately arranged so that the slit 17 of the modulating plate 12 and one lateral row of the sensor 11 coincide with each other. The slits 17 are slit-wise formed in alignment with the line pitches A of the sensor 11. Infrared rays incident via through the slits 17 are incident L1 and L3 at every one line. When the modulating plate 12 is vibrated in a vertical direction at a stroke corresponding to the pitch A by using a bimorph vibrator 13, the infrared rays alternately modulated by L1, L3- and L2, L4- are inputted. Thus, the size and the weight of the sensor 11 can be reduced without using a rotational driving system, such as a motor.

Device to diffuse distribution by blowing-out

Abstract: PURPOSE:To diffuse a distribution by blowing-out uniformly by providing a piezo-electric vibrating body which vibrates with the change in applied voltage at an open port section for discharging gas, liquid, powder, sound waves, or light beams. CONSTITUTION:When a device to diffuse a distribution by blowing-out is applied to the blowing-out port 1 of a ventilator used for vehicles, a voltage which changes periodically, for instance that in an AC current at 150V, and 60 Hz. is applied to the piezo-electric bimorph 7 of a piezo-electric vibrator 6. Because the upstream side of the piezo-electric bimorph 7 is supported by a ventilator grill 2 through a stay 5, its downstream side end vibrates in the up-and-down directions 60 times per second. This vibration is transmitted to a vibrating plate 9 through an attachment 8. The vibrating plate 9 has elasticity, and because it is installed with an inclination of 45 deg. with respect to the face of the piezo-electric bimorph 7, the direction of the vibration amplitude changes 45 deg., so that two vibrating plates 9 of the piezo-electric vibrating body vibrate with 90 deg. phase difference. When the air is discharged from the blowing-out port 1 of the ventilator, the air stream which passes between the vibrating plates 9 changes the direction of its blowing-out 120 times per second in the up-and-down directions and right and left directions, so that the air is diffused and attains a distribution of wind velocity which is close to uniformity.

Driving device equipped with bimorph driving element

Abstract: PURPOSE:To remove assembling errors or fluctuation or the like in the characteristics of a bimorph and to attain accurate driving by providing the titled device with a means for rotatably holding the bimorph by a shaft vertical to the face in parallel with the bending direction of the bimorph and finely adjusting the direction of the bimorph centering around the shaft. CONSTITUTION:A bimorph holder 25 is freely rotatably held on a shutter board 6 through a shaft 6f and engaged with an eccentric pin 31. When the pin 31 is rotated, a fitting part 25b is rotated around the shaft 6f and the tip part of the bimorph 14 is moved in the operating direction of the tip of the bimorph, i.e. to a replaced position based upon voltage impression. When the positional adjustment is executed, positional relation between the tip replacing range of the bimorph and the receiving part of a driven mechanism is adjusted, shutter blades 2, 4 are adjusted so as to be set up to prescribed initial positions and the bimorph 14 is adjusted so as to drive the shutter blades 2, 4 most efficiently. Thus, the driving accuracy of the bimorph can be stabilized.