KR20110060560A - Actuator module of haptic device - Google Patents

Abstract

PURPOSE: An actuator module of a haptic device is provided to increase a vibration generating performance of the actuator module by improving the material of a plate. CONSTITUTION: An actuator module has a structure in which a piezoelectric actuator(120) is attached to a plate(110). The piezoelectric actuator generates vibration through a deformation force. The poisson ratio of the plate is 0.25 or greater. The plate is made of SUS(Stainless Use Steel), brass, aluminum, phosphor bronze, silver cold rolled steel sheet, and plastic. The piezoelectric actuator is attached to the plate using an adhesive tape or adhesive material.

Description

Actuator module of haptic device

The present invention relates to an actuator module of a haptic device.

Various methods are used to make it easier and more convenient for a user to communicate with a computer or a program. Recently, in addition to the concept of inputting by the user, the interface reflects the user's intuitive experience and diversifies the feedback. Haptic devices (haptic device) including a lot has been adopted.

The haptic device can save space, improve operability and simplicity, and can easily change specifications and have high user recognition. Due to these advantages, they are widely used in various fields such as industry, transportation, service, medical care, and mobile.

In general, a haptic device is disposed in close contact with an image display device such as an LCD that displays an image of a touch panel having transparency, and a vibration motor when a user presses the touch panel while viewing an image through the touch panel. Or a vibration feeling is applied to the touch panel by a vibration generating means such as a piezoelectric actuator.

However, the vibration motor as a vibration generating means has a problem that the vibration feeling transmitted to the user through the touch panel is reduced because the entire mobile phone operates to apply tactile feedback to the user in a shaking manner. Therefore, in recent years, a lot of piezoelectric actuators that can improve the feeling of vibration by vibrating predetermined portions are used.

The piezoelectric actuator is a structure in which a plurality of ceramic piezoelectric sheets with electrode patterns are stacked inside and outside, and when the user's input is transmitted, the ceramic piezoelectric sheet contracts or expands due to a power applied to the electrode pattern. Let's go. The piezoelectric actuator is characterized as shown in Table 1 according to the polling (polling) direction for the ceramic piezoelectric sheet.

Polling direction Displacement Generating force % Conversion Same direction 0.36 0.42 8.4 opposite direction 43 0.08 4.9

As can be seen in Table 1, it can be seen that the displacement and the generating force varies depending on the polling direction. That is, when it is necessary to increase the displacement, the polling direction is reversed, and when it is necessary to increase the generating force, the polling direction is the same, so that the piezoelectric actuator can be realized in a desired form.

On the other hand, the haptic device needs to increase the generating force in order to increase the amount of vibration applied to the touch panel, etc., piezoelectric actuators having the same polling direction are used a lot, and FIG. 1A to FIG. 1C have the same polling direction. A diagram for explaining a driving principle of the piezoelectric actuator module according to the drawings is illustrated.

As can be seen in Figures 1a to 1c, the piezoelectric actuator module according to the prior art has a structure in which a piezoelectric actuator 14 having the same polling direction is attached to the plate 12. At this time, since the piezoelectric actuator 14 is elastically deformed in the longitudinal direction when the power is applied, and the piezoelectric actuator 14 is attached to the plate 12, the piezoelectric actuator module becomes longer when the length of the piezoelectric actuator 14 is increased. Bends down (see FIG. 1B), and shrinks up (see FIG. 1C). That is, by using this principle, the piezoelectric actuator module is driven up and down, thereby generating a vertical vibration force.

However, conventionally, copper or beryllium material was used as the plate 12, and this material causes a problem of reducing the vertical vibration force of the piezoelectric actuator module because of its high resistance to the expansion and contraction displacement of the piezoelectric actuator 14. It was. For example, since the beryllium copper has a Poisson's ratio in the range of 0.07 to 0.18, the longitudinal strain with respect to the transverse strain is small, and the resistive force lowers the vertical vibration force of the piezoelectric actuator module. As described above, in spite of the elastic deformation of the piezoelectric actuator 14, when the plate 12 is not deformed, the driving deformation force of the piezoelectric actuator 14 serves as a separating force that separates the piezoelectric actuator 14 from the plate 12. This caused a problem that both members were separated.

On the other hand, Figure 2 shows the results of simulating the deformation state of the piezoelectric actuator module in the state that the rubber plate is used. As shown in FIG. 2, since the rubber material plate absorbs the elastic deformation force of the piezoelectric actuator by its own deformation, it can be seen that the vertical deformation force of the entire piezoelectric actuator module is small.

The present invention has been made to solve the above problems, an object of the present invention is to provide an actuator module of the haptic device that can increase the vibration generating force of the actuator module through the material improvement of the plate.

Another object of the present invention is to provide an actuator module of a haptic device that can increase the bonding between the plate and the piezoelectric actuator through improving the material of the plate.

The present invention relates to an actuator module of a haptic device, wherein the actuator module applies vibration to a touch panel or an image display unit of the haptic device, wherein the actuator module has a structure in which a piezoelectric actuator for generating vibration by deformation force is attached to a plate. The plate has a Poisson's ratio of 0.25 or more.

Here, the plate is characterized in that formed of one material selected from sus (SUS), brass, aluminum, phosphor bronze, silver, cold rolled steel (SPCC), plastic.

In addition, the piezoelectric actuator is characterized in that attached to the plate via an adhesive tape or adhesive.

In addition, the additive piezoelectric actuator has a structure in which a plurality of ceramic piezoelectric sheets on which electrode patterns are printed are stacked, and each ceramic piezoelectric sheet has the same polling direction.

In addition, the actuator module is characterized in that the oscillation up and down according to the longitudinal expansion and contraction of the piezoelectric actuator.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be interpreted in a conventional and dictionary sense, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. On the basis of the principle that it can be interpreted as meaning and concept corresponding to the technical idea of the present invention.

According to the present invention, since the plate is formed of a material having a Poisson's ratio of 0.25 or more, the resistance to the driving displacement of the piezoelectric actuator is small, thereby increasing the amount of vibration generated in the actuator module.

In addition, since the plate has good ductility due to the high Poisson's ratio of the piezoelectric actuator, and it bends well, deformation of the plate together with the piezoelectric actuator can increase the bonding between the plate and the piezoelectric actuator.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic perspective view of a haptic device having an actuator module according to a preferred embodiment of the present invention, and FIG. 4 is a cross-sectional view of the actuator module shown in FIG. Hereinafter, the actuator module of the haptic device according to the present embodiment will be described with reference to this.

As shown in FIGS. 3 and 4, the actuator module of the haptic device according to the present embodiment has a structure in which a piezoelectric actuator 120 that generates vibration by deformation force is attached to the plate 110, and the plate 110. Is characterized in that the Poisson's ratio is 0.25 or more.

Here, the actuator module is applied to the vibration generated by being attached to the image display unit 140, such as the touch panel 130 or the LCD to input and display the user's request, is received (fastened) in the set mechanism unit 150 used do. For example, the touch panel 130 is formed by stacking an outer film layer, an ITO film layer, and a base film layer. Here, the external film layer is mounted on the front surface of the mobile communication terminal, and may be divided into a viewing area capable of touch input and a dead space area formed around the display area. On the other hand, the outer film layer is made of a transparent film material such as, for example, poly ethylene terephtalate (PET) to see through the screen of the image display unit 140. Although not shown in detail, an ITO film layer (Indium Tin Oxide film) is laminated in two upper and lower film layers, and a dot spacer is provided between them to maintain a constant gap therebetween. Each film layer is provided with an electrode film having conductive X-axis patterns and Y-axis patterns formed along edges, and the X-axis pattern and Y-axis pattern are electrically separated by an insulator (not shown). The electrode film is exposed to the outside of the ITO film layer through the FPC cable and electrically connected to the portable terminal. The base film layer serves to support the entire touch panel. For example, a glass substrate having excellent transmittance and touch response speed may be used.

The plate 110 serves to transmit a vibration generated from the piezoelectric actuator 120 to the touch panel 130 or the image display unit 140 while providing a space in which the piezoelectric actuator 120 is mounted. It is attached to the panel 130 or the image display unit 140.

Here, the Poisson's ratio is the ratio of the transverse strain (within the elastic limit) and the longitudinal strain, which is stretched in the direction when the elastic body is pulled in the transverse direction and at the same time contracted in the longitudinal direction. In this case, since the resistance to deformation of the piezoelectric actuator 120 is small, the vibration generating force can be increased by deforming together with the deformation of the piezoelectric actuator 120.

Here, the plate 110 is a material having a Poisson's ratio of 0.25 or more, for example, sus (SUS) (a Poisson's ratio of about 0.25), brass (A Poisson's ratio of about 0.307), aluminum (Poisson's ratio of about 0.25 or more), phosphor bronze ( 0.34), silver (Poisson ratio of about 0.37 ~ 0.39), cold rolled steel (SPCC) (Poisson ratio of about 0.29), plastic (about 0,25 or more) may be formed of one material selected.

The piezoelectric actuator 120 is for applying vibration to the touch panel 130 or the image display unit 140 by generating vibration, and is bonded to the plate 110 through an adhesive tape or an adhesive.

Here, the piezoelectric actuator 120 has a structure in which a plurality of ceramic piezoelectric sheets are stacked, and an electrode pattern is printed on the inside and outside of the ceramic piezoelectric sheet. When power is applied to the electrode pattern, the ceramic piezoelectric sheet is bent and deformed. At this time, each ceramic piezoelectric sheet has the same polling direction, and thus the ceramic piezoelectric sheet is stretched and deformed in the longitudinal direction when the power is applied.

5A and 5B are diagrams for describing a driving principle of the actuator module illustrated in FIG. 3. As shown in FIGS. 5A and 5B, when power is applied to the piezoelectric actuator 120 and the piezoelectric actuator 120 is stretched and deformed, the piezoelectric actuator 120 has a structure attached to the plate 110. When the length of the actuator 120 is long, the piezoelectric actuator module is bent downward (see FIG. 5A), and when it is reduced, it is bent upwards (see FIG. 5B). At this time, since the plate 110 is formed of a material having a Poisson's ratio of 0.25 or more, the resistance to deformation of the piezoelectric actuator 120 is smaller than that of the conventional structure, thereby increasing the vertical vibration deformation amount.

6 is a result of simulating a deformation state of the actuator module in a state where a plate of sus material is used according to a preferred embodiment of the present invention. As can be seen in Figure 6, when the plate 110 is formed with a suspo ratio of about 0.25, compared to the plate formed of a rubber material (see Figure 2), it can be seen that the upper and lower vibration deformation amount is large. Although only a simulation result of the sus material is shown in FIG. 6, even when the plate 110 is made of a material having a Poisson's ratio of about 0.25 or more, the upper and lower vibration amounts are larger than those of the rubber material or the beryllium copper. .

Although the present invention has been described in detail through specific embodiments, this is for explaining the present invention in detail, and the actuator module of the haptic device according to the present invention is not limited thereto, and the technical features of the present invention may be used. It is clear that modifications and improvements are possible by those with knowledge of the world.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

1A to 1C are diagrams for describing a driving principle of a piezoelectric actuator module having the same polling direction according to the related art.

2 is a result of simulating a deformation state of the piezoelectric actuator module in a state where a rubber plate is used.

3 is a schematic perspective view of a haptic device with an actuator module according to a preferred embodiment of the present invention.

4 is a cross-sectional view of the actuator module shown in FIG. 3.

5A and 5B are diagrams for describing a driving principle of the actuator module illustrated in FIG. 3.

6 is a result of simulating a deformation state of the actuator module in a state where a plate of sus material is used according to a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110; Plate 120: Piezo Actuator

130: touch panel 140: image display unit

Claims (5)

An actuator module for applying vibration to a touch panel or an image display unit of a haptic device, The actuator module has a structure in which a piezoelectric actuator for generating vibration by the deformation force is attached to the plate, The plate has a Poisson's ratio of 0.25 or more actuator module of the haptic device. The method according to claim 1, The plate is made of one material selected from sus (SUS), brass, aluminum, phosphor bronze, silver, cold rolled steel (SPCC), plastic, the actuator module of the haptic device. The method according to claim 1, The piezoelectric actuator is an actuator module of the haptic device, characterized in that attached to the plate via an adhesive tape or adhesive. The method according to claim 1, The malleable piezoelectric actuator has a structure in which a plurality of ceramic piezoelectric sheets on which electrode patterns are printed are stacked, and each of the ceramic piezoelectric sheets has the same polling direction. The method according to claim 1, The actuator module is an actuator module of the haptic device, characterized in that the oscillating up and down according to the longitudinal expansion and contraction of the piezoelectric actuator.

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