Abstract: A method for driving a piezo actuator includes detecting consumption current by stepwise sweeping the frequency of an actuator driving signal to drive the piezo actuator vibrated in response to first and second vibration modes from a first reference frequency and determining a frequency at which the consumption current is inflected to be a first resonant frequency, detecting consumption current by stepwise sweeping the frequency of the actuator driving signal from a second reference frequency and determining a frequency at which the consumption current is inflected to be a second resonant frequency, and outputting an actuator driving signal in response to the first resonant frequency and the second resonant frequency.

Abstract: A vibrator includes: a housing having an interior space; a vibrating member installed within the housing; a piezoelectric element installed on a top surface of the vibrating member; and space forming parts disposed to face side surfaces of the piezoelectric element, respectively, and forming a space in which a filler is provided, together with the side surfaces of the piezoelectric element.

Abstract: A vibrator includes: a housing having an interior space; a vibrating member having a plate shape, having both end portions fixedly installed within the housing, and including space forming parts disposed on both side surfaces thereof; a piezoelectric element fixedly installed on the vibrating member so as to be disposed inwardly of the space forming parts; and a weighting body disposed on the piezoelectric element and linked to the vibrating member to be vibrated, wherein the piezoelectric element is installed on the vibrating member so as to be disposed to be spaced apart from inner surfaces of the space forming parts at predetermined intervals, and the piezoelectric element includes a main electrode formed by an electrode pair and at least one preliminary electrode formed by an electrode pair and disposed to be spaced apart from the main electrode.

Abstract: There is provided a piezoelectric vibration actuator including: a flat cover member; a vibration portion including a vibration plate that is spaced apart from the cover member in parallel by a predetermined distance and a piezoelectric element that generates a vibration force by repeatedly expanding and contracting according to power applied from the outside; a weight portion disposed on the vibration portion to increase the vibration force of the piezoelectric element; and a binding member fixing the vibration portion and the weight portion. In addition, an enclosure portion is interposed between the weight portion and the vibration portion to enclose the center areas of the vibration portion, thereby making it possible to protect the piezoelectric element.

Abstract: There is provided a vibration generating device including: a housing having an internal space; a vibration member having one end fixedly attached to the housing; a piezoelectric element installed on the vibration member; and a mass body fixedly attached to the vibration member, wherein the vibration member includes an installation part on which the piezoelectric element is installed, and an extension part extended from at least one side surface of the installation part, and a maximum displacement portion of the vibration member is changed depending on a vibration mode.

Abstract: There is provided a vibration generating apparatus including: a housing having an internal space; a vibration member having both end portions thereof fixed to the housing; and a piezoelectric element installed on the vibration member, wherein the vibration member includes a first member having the piezoelectric element installed thereon and second members disposed at both end portions of the first member, the second members being formed of a material having a higher degree of tensile strength than the first member.

Abstract: There is provided a vibration generating apparatus including: an elastic member having both end portions fixed to a housing; a piezoelectric element installed on one surface of the elastic member; and a circuit board connected to the piezoelectric element, wherein the elastic member has support parts formed on both side surfaces of both end portions thereof and bent downwardly in order to be installed in the housing, and a portion of the circuit board passing between the support parts has a flat panel shape.

Abstract: There is provided a vibrator including: an elastic member of which both end portions are fixedly attached to a housing; a piezoelectric element installed on one surface of the elastic member; and a circuit board attached to the elastic member to be connected to the piezoelectric element, wherein an opening portion for a connection between the piezoelectric element and the circuit board is provided in the elastic member, and a step portion insertedly disposed in the opening portion is formed at the circuit board.

Abstract: A piezoelectric element includes an element layer, an electrode layer including one or more positive electrode layers and one or more negative electrode layers repeatedly stacked to alternate with each other on the element layers in a vertical direction, a primary positive electrode connection member connecting the positive electrode layers, a primary negative electrode connection member connecting the negative electrode layers, at least one secondary positive electrode connection member, at least one secondary negative electrode connection member, and a primary electrode connected to the primary positive electrode connection member and the primary negative electrode connection member and configured of a pair of electrodes, and at least one secondary electrode spaced apart from the primary electrode and configured of a pair of electrodes.

Abstract: Disclosed herein is a piezo vibration module, including: a piezo element having a pattern of an internal electrode printed therein and having an external electrode connected to the internal electrode disposed on an outer surface thereof; a flexible printed circuit board (FPCB) having each terminal and applying power to the external electrodes of the piezo element; and a conductive adhesive interposed between the piezo element and the FPCB to electrically connect the piezo element to the flexible printed circuit board.

Abstract: A piezoelectric element includes an element layer, an electrode layer including one or more positive electrode layers and one or more negative electrode layers repeatedly stacked to alternate with each other on the element layers in a vertical direction, a primary positive electrode connection member connecting the positive electrode layers, a primary negative electrode connection member connecting the negative electrode layers, at least one secondary positive electrode connection member, at least one secondary negative electrode connection member, and a primary electrode connected to the primary positive electrode connection member and the primary negative electrode connection member and configured of a pair of electrodes, and at least one secondary electrode spaced apart from the primary electrode and configured of a pair of electrodes.

Abstract: A method for driving a piezo actuator includes detecting consumption current by stepwise sweeping the frequency of an actuator driving signal to drive the piezo actuator vibrated in response to first and second vibration modes from a first reference frequency and determining a frequency at which the consumption current is inflected to be a first resonant frequency, detecting consumption current by stepwise sweeping the frequency of the actuator driving signal from a second reference frequency and determining a frequency at which the consumption current is inflected to be a second resonant frequency, and outputting an actuator driving signal in response to the first resonant frequency and the second resonant frequency.

Abstract: A piezoelectric element includes an element layer, an electrode layer including one or more positive electrode layers and one or more negative electrode layers repeatedly stacked to alternate with each other on the element layers in a vertical direction, a primary positive electrode connection member connecting the positive electrode layers, a primary negative electrode connection member connecting the negative electrode layers, at least one secondary positive electrode connection member, at least one secondary negative electrode connection member, and a primary electrode connected to the primary positive electrode connection member and the primary negative electrode connection member and configured of a pair of electrodes, and at least one secondary electrode spaced apart from the primary electrode and configured of a pair of electrodes.

Abstract: There is provided a vibration generating apparatus including: an elastic member having both end portions thereof fixedly installed on a support part of a lower case; a piezoelectric element installed on one surface of the elastic member; and a mass body part connected to the elastic member to increase an amount of vibrations, wherein the mass body part is provided with protrusion portions for first contacting the lower case at the time of an external impact.

Abstract: A vibration generating apparatus may include a housing having an internal space, an elastic member mounted in the internal space, a piezoelectric element having one surface thereof mounted on the elastic member, and a mass body fixed to the other surface of the piezoelectric element by a buffering adhesive.

Abstract: Disclosed herein is a piezoelectric vibration module including a vibration plate that is surrounded by an upper case and a lower case, and includes a stopper capable of preventing direct collision between a piezoelectric element and an internal constituent member, for example, a lower case while vibrating linearly therein.

Abstract: There is provided a piezoelectric vibration actuator including: a flat cover member; a vibration portion including a vibration plate that is spaced apart from the cover member in parallel by a predetermined distance and a piezoelectric element that generates a vibration force by repeatedly expanding and contracting according to power applied from the outside; a weight portion disposed on the vibration portion to increase the vibration force of the piezoelectric element; and a binding member fixing the vibration portion and the weight portion. In addition, an enclosure portion is interposed between the weight portion and the vibration portion to enclose the center areas of the vibration portion, thereby making it possible to protect the piezoelectric element.

Abstract: There is provided a vibration generating device including: a housing having an internal space; a vibration member having one end fixedly attached to the housing; a piezoelectric element installed on the vibration member; and a mass body fixedly attached to the vibration member, wherein the vibration member includes an installation part on which the piezoelectric element is installed, and an extension part extended from at least one side surface of the installation part, and a maximum displacement portion of the vibration member is changed depending on a vibration mode.

Abstract: There is provided a vibration generating device including: a housing having an internal space and including installation bars; a vibration member having through holes which are formed in both end portions thereof and which is fixedly attached to the installation bars by allowing upper end portions of the installation bars to penetrate through the through holes; a piezoelectric element installed on the vibration member; and a fixing unit fixing the vibration member to the installation bars.

Abstract: A full body drying system is an apparatus that can dry a full body with forced air, measure the weight of the body, and provide other health enhancing functions. The apparatus comprises a lower frame, and an upper frame, a blower unit, a foot plate, and a weighing scale. The lower frame and the upper frame provide the other components of the apparatus with the proper structural support. Once the user steps onto the foot plate, the blower unit provides the motorized forced air carrying massive amount of anions, which is used to dry and also to invigorate the body, and simultaneously the body weight is measured and displayed. In addition, around the user's feet area, UV light combined with antimicrobial plastic material used for the foot plate provide effective disinfection of the user's feet, which is further enhanced by the disinfecting ability of anions in the forced air stream.