Device with vibration function

Abstract

To provide an on-vehicle "device with a vibration function" for suppressing transmission of vibration to a vehicle body.SOLUTION: The natural frequency f0 of the actuators 12 that generate vibration having the same frequency as the frequency ω / 2 π of the drive signal Fsin (ω t) is 110Hz, the natural frequency f0 of the display 11 to which vibration is applied by the actuators 12 is 110Hz, and the natural frequency f0 of the vehicle body 3 to which the display 11 is fixed is 50Hz. When the phase difference between the vibration of the vehicle body (3) and that of the display (11) exceeds about 150 Hz and becomes 90 ° or more (b1), a frequency of 150 Hz or more (for example, 200 Hz) at which the phase difference between the vibration of the vehicle body (3) and that of the display (11) becomes 90 ° or more is used as the frequency of the drive signal of the actuator (12) to attenuate the acceleration transmitted from the display (11) to the vehicle body (3) (b2).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a device with a vibrating function. [Background technology]

[0002] Known devices with a vibrating function include in-vehicle touch panel displays that provide tactile feedback by vibrating when a user makes a touch operation (for example, Patent Document 1). Here, in this touch panel display, the display is elastically mounted on the housing, and a movable counter mass is provided to suppress transmission of vibrations to the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-535062 Summary of the Invention [Problem to be solved by the invention]

[0004] Typically, an in-vehicle device with a vibrating function is fixed to the vehicle body, and the vibration of the device is transmitted to the vehicle body. Therefore, if the vibration of the device is large, the vehicle body may vibrate significantly, resulting in unpleasant vibrations and abnormal noises, which has been an obstacle to increasing the vibration of the device. Therefore, an object of the present invention is to suppress the transmission of vibration from a device having a vibrating function to a base on which the device is fixed. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention provides a device with a vibration function, which comprises a device fixed to a base and an actuator that vibrates the device, wherein the actuator generates vibrations at a frequency such that the phase difference between the vibration of the device, which is caused by the actuator as a vibration source, and the vibration of the base is 90° or more, and the generated vibrations vibrate the device.

[0006] In this vibrating device, the natural frequency of the actuator is preferably the same as or close to the frequency of the generated vibration. Furthermore, the actuator may generate vibrations at the same frequency as a drive signal applied to the actuator, and the frequency of the drive signal applied to the actuator may be set to a frequency that results in a phase difference of 90° or more between the vibration of the device, which uses the actuator as a vibration source, and the vibration of the base.

[0007] Furthermore, in the above-described device with vibration function, the base may be the body of an automobile, and the device may be an in-vehicle device that is operated by contact with the user. In this case, the device may be a touch panel display or a switch. With the above-described device with vibration function, a deviation occurs in the direction of the load input from the device to the base relative to the direction of movement of the base, so that the acceleration transmitted from the device to the base is attenuated and the transmission of vibration to the base is suppressed. [Effects of the Invention]

[0008] As described above, according to the present invention, it is possible to suppress the transmission of vibration from a device having a vibrating function to a base on which the device is fixed. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are diagrams illustrating an example of a vibrating function device according to an embodiment of the present invention. [Figure 2]1A and 1B are diagrams illustrating a display according to an embodiment of the present invention and a spring-mass-damper system model thereof. [Figure 3] FIG. 10 is a diagram illustrating the effects of the embodiment of the present invention. [Figure 4] 10A and 10B are diagrams illustrating another example of a display according to an embodiment of the present invention and its spring-mass-damper system model. [Figure 5] FIG. 10 is a diagram illustrating the effects of another example according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described. This embodiment is applied to an in-vehicle device with a vibration function, which is fixed to the vehicle body and is operated by a user's touch. Examples of such in-vehicle devices include a display unit 1 with a touch panel located on the center dashboard of an automobile, and a multi-function switch 2 located on the center console, as shown in Fig. 1. Note that such in-vehicle devices may also include any other in-vehicle devices that are operated by touch by the user, such as switches for operating the air conditioner or audio system, or in-vehicle devices that integrate the display unit 1 and multi-function switch 2.

[0011] In either case, the vibration function of the in-vehicle device is basically used to provide tactile feedback by vibration when a touch operation is performed by the user. Hereinafter, this embodiment will be described by taking as an example a case where it is applied to a display unit 1 with a touch panel. FIG. 2a shows a schematic diagram of an example of the structure of the display unit 1 with a touch panel and the relationship between the display 11 and the vehicle body 3. As shown in FIG. As shown in the figure, the display unit 1 includes a display 11 and an actuator 12 fixed to the display 11 for generating vibrations. The display 11 includes a display touch panel 111 that serves as both a touch panel and a display panel, and a housing 112 to which the display touch panel 111 is fixed, and the housing 112 of the display 11 is fixed to the vehicle body 3 with screws or the like. The actuator 12, the display 11, and the car body 3 can be modeled as a spring-mass-damper system model shown in FIG. 2b in terms of the vibration generated by the actuator 12. Hereinafter, the present embodiment will be described with a specific example of a verification configuration, in which the configuration of the actuator 12, the display 11, and the vehicle body 3 used by the inventors to verify the present invention is used. In the verification configuration, the actuator 12 used had a natural frequency f0 of 110 Hz. In the verification configuration, the natural frequency f0 of the actuator 12 was 110 Hz, the natural frequency f0 of the display 11 was 110 Hz, and the natural frequency f0 of the car body 3 was 50 Hz. The actuator 12 is driven by an externally applied drive signal Fsin(ωt), and generates vibrations with the same frequency as the frequency ω / 2π of the drive signal Fsin(ωt). The frequency of the drive signal is variable.

[0012] In this case, the inertance (acceleration / load) of the actuator 12, display 11, and car body 3 relative to the frequency of the drive signal is as shown in Figure 3a1, and it can be seen that setting the frequency of the drive signal to around 110 Hz is the most efficient way to vibrate the display 11.

[0013] On the other hand, when a drive signal with a frequency of 110 Hz is used, the time waveform of the acceleration of the display 11 and the vehicle body 3 is as shown in Figure 3a2, and the acceleration transmitted from the display 11 to the vehicle body 3 is relatively large, causing relatively large vibrations in the vehicle body 3. Next, FIG. 3b1 shows the phases of vibrations of the actuator 12, the display 11, and the vehicle body 3, and the phase difference between the vibrations of the vehicle body 3 and the display 11, with respect to frequency. As shown in the figure, the phase difference between the vibrations of the car body 3 and the display 11 increases as the frequency increases, and becomes 90° or more when the frequency exceeds approximately 150 Hz. Here, if the phase difference between the vibrations of the body 3 and the display 11 becomes 90° or more, a shift occurs in the direction of the load input from the display 11 to the body 3 relative to the direction of movement of the body 3, and the acceleration transmitted from the display 11 to the body 3 is attenuated. Therefore, in this embodiment, a frequency at which the phase difference between the vibrations of the car body 3 and the display 11 is 90° or more is used as the frequency of the drive signal for the actuator 12. Figure 3b2 shows the time waveform of the acceleration of the display 11 and the vehicle body 3 when a drive signal with a frequency of 220 Hz is used, and the acceleration transmitted from the display 11 to the vehicle body 3 is attenuated compared to when a drive signal with a frequency of 110 Hz is used as shown in Figure 3a2. Therefore, Figure 3b2 confirms that the vibration occurring in the vehicle body 3 can be suppressed by setting the frequency of the drive signal of the actuator 12 to a frequency that results in a phase difference between the vibrations of the vehicle body 3 and the display 11 of 90° or more. Furthermore, the mutual influence between the display 11 and the vehicle body 3 is reduced, making the display 11 more susceptible to vibration.

[0014] Now, as shown in the inertance (acceleration / load) in Figure 3a1, when actuator 12 with a natural frequency f0 of 110 Hz is driven with a drive signal of a frequency that results in a phase difference of 90° or more between the vibrations of car body 3 and display 11, the efficiency of vibrating display 11 is lower than when driven with a drive signal of a frequency around 110 Hz.

[0015] Therefore, it is possible to use an actuator 12 whose natural frequency f0 is a frequency at which the phase difference between the vibrations of the car body 3 and the display 11 is 90° or more, and to drive the actuator 12 with a drive signal having a frequency around the natural frequency f0. Fig. 4 shows an example of a spring-mass-damper system model when such an actuator 12 is used, and in this example, an actuator 12 whose natural frequency f0 is 200 Hz is used as the actuator 12.

[0016] 5a shows the inertance (acceleration / load) of the actuator 12, display 11, and vehicle body 3 relative to the frequency of the drive signal when the natural frequency f0 of the actuator 12 is set to 200 Hz. As shown in the figure, in this case, by driving the actuator 12 with a drive signal having a frequency around 200 Hz, which is the natural frequency f0, the display 11 can be vibrated efficiently.

[0017] FIG. 5b shows the phases of vibration of the actuator 12, display 11, and vehicle body 3, and the phase difference between the vibrations of the vehicle body 3 and display 11, relative to frequency when the natural frequency f0 of the actuator 12 is set to 200 Hz. As shown in the figure, in this case too, the phase difference between the vibrations of the car body 3 and the display 11 increases as the frequency increases, and becomes 90° or more when the frequency exceeds approximately 145 Hz. Therefore, when a frequency around 200 Hz, which is the natural frequency f0, is used as the frequency of the drive signal, the frequency of the drive signal is a frequency at which the phase difference between the vibrations of the car body 3 and the display 11 is 90° or more. Figure 5c shows the time waveforms of the acceleration of the vehicle body 3 and the display 11 when the frequency of the drive signal is 200 Hz. Compared to the case where a drive signal with a frequency of 110 Hz shown in Figure 3a2 is used, the acceleration of the display 11 is almost the same, but the acceleration transmitted from the display 11 to the vehicle body 3 is greatly attenuated.

[0018] Therefore, by setting the natural frequency f0 of actuator 12 to a frequency at which the phase difference between the vibrations of the vehicle body 3 and display 11 is 90° or more, and driving actuator 12 with a drive signal having a frequency around the natural frequency f0, it is possible to efficiently vibrate display 11 while suppressing vibrations occurring in the vehicle body 3.

[0019] The embodiments of the present invention have been described above. Although the above describes application to a device with a vibration function that is fixed to the vehicle body 3 and operated by the user through contact, this embodiment can be similarly applied to any device with a vibration function that is fixed to any base. In other words, in this case, the actuator 12 that vibrates the device can be driven with a drive signal having a frequency that results in a phase difference between the device and the base of 90° or more, or the natural frequency of the actuator 12 can be set to a frequency that results in a phase difference between the device and the base of 90° or more, and the actuator 12 can be driven with a drive signal having a frequency close to the natural frequency of the actuator 12. [Explanation of symbols]

[0020] 1...display unit, 2...multifunction switch, 3...vehicle body, 11...display, 12...actuator, 111...display touch panel, 112...casing.

Claims

1. A device with a vibration function includes a device fixed to a base and an actuator that vibrates the device, The actuator generates vibrations at a frequency such that the phase difference between the vibration of the device caused by the actuator as a vibration source and the vibration of the base is 90° or more, and the generated vibrations vibrate the device.

2. The vibrating device according to claim 1, A device with a vibration function, wherein the natural frequency of the actuator is the same as or close to the frequency of the vibration generated.

3. The vibrating device according to claim 1, The actuator generates vibrations at the same frequency as a drive signal applied to the actuator, and the frequency of the drive signal applied to the actuator is a frequency at which the phase difference between the vibration of the device, which uses the actuator as a vibration source, and the vibration of the base is 90° or more.

4. 4. The device with vibration function according to claim 1, 2 or 3, the base is a car body, The device is a device with a vibration function, which is mounted on a vehicle and is operated by a user's touch.

5. The vibrating device according to claim 4, The device with vibration function is characterized in that the device is a display with a touch panel or a switch.

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