US-12624948-B2 - Physical quantity sensor and electronic device

US12624948B2US 12624948 B2US12624948 B2US 12624948B2US-12624948-B2

Abstract

Provided is a physical quantity sensor attached to an electronic device provided with an actuator. The physical quantity sensor includes: a sensor element configured to output a detection signal corresponding to a physical quantity; a memory configured to store a resonance characteristic of the electronic device; a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in vibrations of the electronic device indicated by the detection signal; and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal.

Inventors

Hideyuki Yamada
Hideo Haneda

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260512
Application Date: 20230623
Priority Date: 20220624

Claims (6)

1 . A physical quantity sensor attached to an electronic device provided with an actuator, the physical quantity sensor comprising: a sensor element configured to detect a first angular velocity around a first axis of the sensor element and output a detection signal corresponding to the first angular velocity, the first angular velocity being in a first direction; a memory configured to store a resonance characteristic of the electronic device, the resonance characteristic being obtained based on a second angular velocity around a second axis of the electronic device, the second angular velocity being caused by vibrations of the electronic device due to driving of the actuator, the second angular velocity being in a second direction; a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in the vibrations of the electronic device indicated by the detection signal; and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal, wherein the sensor element and the actuator are arranged at positions so that the first direction of the first angular velocity is the same as the second direction of the second angular velocity.
2 . The physical quantity sensor according to claim 1 , wherein the signal output circuit has a resonance characteristic measurement mode of outputting the actuator drive signal for measuring the resonance characteristic by vibrating the electronic device, and a vibration-damping mode of outputting, based on the resonance characteristic measured in the resonance characteristic measurement mode and stored in the memory, the actuator drive signal for reducing the vibration corresponding to the resonance characteristic.
3 . The physical quantity sensor according to claim 2 , wherein in the resonance characteristic measurement mode, an external device coupled to the physical quantity sensor is configured to acquire the actuator drive signal generated by vibrating the electronic device and the detection signal output according to the vibrations of the electronic device generated by the actuator drive signal, acquire the resonance characteristic based on the acquired actuator drive signal and the acquired detection signal, and store the acquired resonance characteristic in the memory.
4 . The physical quantity sensor according to claim 2 , wherein in the resonance characteristic measurement mode, an external device coupled to the physical quantity sensor is configured to acquire the actuator drive signal generated by vibrating the electronic device and the detection signal output according to the vibrations of the electronic device generated by the actuator drive signal, transmit the actuator drive signal and the detection signal to a server via a network, acquire, from the server via the network, the resonance characteristic acquired in the server based on the transmitted actuator drive signal and the transmitted detection signal, and store the acquired resonance characteristic in the memory.
5 . The physical quantity sensor according to claim 1 , wherein the signal output circuit includes an IIR filter configured to input the detection signal and adjust a signal in a frequency band indicated by a parameter, and the memory is configured to store the parameter for adjusting a signal of a resonance frequency of the electronic device as the resonance characteristic in the IIR filter.
6 . An electronic device comprising: an actuator; and a physical quantity sensor attached to the actuator and including: a sensor element configured to detect a first angular velocity around a first axis of the sensor element and output a detection signal corresponding to the first angular velocity, the first angular velocity being in a first direction; a memory configured to store a resonance characteristic of the electronic device, the resonance characteristic being obtained based on a second angular velocity around a second axis of the electronic device, the second angular velocity being caused by vibrations of the electronic device, due to driving of the actuator, the second angular velocity being in a second direction; a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in the vibrations indicated by the detection signal; and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal, wherein the sensor element and the actuator are arranged at positions so that the first direction of the first angular velocity is the same as the second direction of the second angular velocity.

Description

The present application is based on, and claims priority from JP Application Serial Number 2022-101664, filed Jun. 24, 2022, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a physical quantity sensor and an electronic device. 2. Related Art In the related art, a technique has been known in which an actuator is driven based on a detection signal detected by a physical quantity sensor such as a gyro sensor to perform posture control of an electronic device or the like. For example, JP-A-2019-82454 discloses a gyro sensor device that incorporates a circuit and improves responsiveness of control of an actuator. The circuit generates an actuator drive signal. A resonance characteristic of an electronic device may vary depending on a size, a material, and the like of the electronic device. When an installation environment of the electronic device changes, the resonance characteristic may vary. In the related art, it is difficult to change a control content of the actuator according to the resonance characteristic of the electronic device. SUMMARY According to an aspect of the present disclosure, there is provided a physical quantity sensor attached to an electronic device provided with an actuator. The physical quantity sensor includes: a sensor element configured to output a detection signal corresponding to a physical quantity; a memory configured to store a resonance characteristic of the electronic device; a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in vibrations of the electronic device indicated by the detection signal; and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal. According to another aspect of the present disclosure, an electronic device includes: an actuator; and a physical quantity sensor attached to the actuator and including a sensor element configured to output a detection signal corresponding to a physical quantity, a memory configured to store a resonance characteristic, a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in vibrations indicated by the detection signal, and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of use of a vibration-damping box including a physical quantity sensor. FIG. 2 is a block diagram of the vibration-damping box. FIG. 3 is a block diagram showing a configuration of a processor. FIG. 4 is a diagram showing an example of a gain. FIG. 5 is a diagram showing a configuration example of an IIR filter. FIG. 6 is a diagram showing an example of use of the vibration-damping box including the physical quantity sensor. DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described in detail with reference to drawings. First Embodiment FIG. 1 is a diagram showing an example of use of a vibration-damping box 1 including a physical quantity sensor 2 according to an embodiment of the present disclosure. FIG. 2 is a block diagram of the vibration-damping box 1 according to the embodiment of the present disclosure. FIG. 1 shows a state in which a projector P is attached to a ceiling C. The projector P is a device that projects a predetermined image onto a screen (not shown). The projector P is an example of an electronic device. The vibration-damping box 1 is attached to one surface of the projector P. The vibration-damping box 1 includes a housing, and includes the physical quantity sensor 2 and an actuator 40 in the housing. Therefore, in the embodiment, it can be said that the physical quantity sensor 2 and the actuator 40 are attached to the projector P. The physical quantity sensor 2 operates in a resonance characteristic measurement mode and a vibration-damping mode. Of course, the physical quantity sensor 2 may be possible to operate in another mode. When the physical quantity sensor 2 operates in the vibration-damping mode, the physical quantity sensor 2 can damp a vibration of the projector P by detecting a vibration generated in the course of use of the projector P and driving the actuator to reduce the vibration (details will be described later). The physical quantity sensor 2 can be coupled to a computer PC via a terminal to be described later. In the embodiment, the computer PC is used in the resonance characteristic measurement mode for measuring a resonance characteristic of the projector P. In the vibration-damping mode, the computer PC is not used. In the resonance characteristic measurement mode, the physical quantity sensor 2 excites the projector P