Capacitive device for detecting an electrically floating object
US-2019346288-A1 · Nov 14, 2019 · US
Capacitive button
US12587194B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12587194-B2 |
| Application number | US-202118286772-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 6, 2021 |
| Priority date | May 6, 2021 |
| Publication date | Mar 24, 2026 |
| Grant date | Mar 24, 2026 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A capacitive button capable of improving tolerance to electrostatic discharge is provided. The capacitive button includes: a pair of sensor electrodes which are provided side by side; a floating electrode which is arranged on a front side of the pair of sensor electrodes via an insulating layer; and a ground electrode which is arranged so as to surround the floating electrode, and is grounded without being electrically connected with the pair of sensor electrodes and the floating electrode. By providing the configuration, the tolerance to the electrostatic discharge of the capacitive button can be improved.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A capacitive button comprising: a pair of sensor electrodes which are provided side by side; a floating electrode which is arranged on a front side of the pair of sensor electrodes via an insulating layer; and a ground electrode which is arranged so as to surround the floating electrode and is grounded without being electrically connected with the pair of sensor electrodes and the floating electrode, wherein capacitances of the pair of sensor electrodes are detected by a mutual capacitance system each as an excitation electrode and a detection electrode, and the capacitive button further comprising: a holding body which holds the pair of sensor electrodes and the floating electrode from a back side; and a tactile switch which is provided on the back side of the holding body, and is pressed when the holding body is moved from the front side to the back side. 2 . The capacitive button according to claim 1 , wherein the pair of sensor electrodes are each divided and capacitance between the pair of sensor electrodes and the floating electrode is the same. 3 . The capacitive button according to claim 1 , wherein the floating electrode has an area corresponding to an area of the pair of sensor electrodes. 4 . The capacitive button according to claim 1 , wherein the pair of sensor electrodes are connected to a circuit to which a microcomputer, a regulator and a regulated power supply are connected, via a resistor and a suppressor, and are set such that a characteristic impedance is electrically uniform with the microcomputer, the regulator and the regulated power supply. 5 . The capacitive button according to claim 1 , wherein the pair of sensor electrodes are connected to a circuit to which a microcomputer, a regulator and a regulated power supply are connected in a state where a power terminal of the microcomputer is connected via a bypass capacitor in the circuit, and are set such that a characteristic impedance is electrically uniform with the microcomputer, the regulator and the regulated power supply. 6 . A capacitive button comprising: a pair of sensor electrodes which are provided side by side; a floating electrode which is arranged on a front side of the pair of sensor electrodes via an insulating layer; and a ground electrode which is arranged so as to surround the floating electrode and is grounded without being electrically connected with the pair of sensor electrodes and the floating electrode, wherein capacitances of the pair of sensor electrodes are detected by a mutual capacitance system each as an excitation electrode and a detection electrode, and the capacitive button further comprising an antenna electrode which is provided side by side with the pair of sensor electrodes in a state of forming a gap with the floating electrode more on a back side than the floating electrode, and is grounded. 7 . The capacitive button according to claim 6 , wherein the pair of sensor electrodes are each divided and capacitance between the pair of sensor electrodes and the floating electrode is the same. 8 . The capacitive button according to claim 6 , wherein the floating electrode has an area corresponding to an area of the pair of sensor electrodes. 9 . The capacitive button according to claim 6 , wherein the pair of sensor electrodes are connected to a circuit to which a microcomputer, a regulator and a regulated power supply are connected, via a resistor and a suppressor, and are set such that a characteristic impedance is electrically uniform with the microcomputer, the regulator and the regulated power supply. 10 . The capacitive button according to claim 6 , wherein the pair of sensor electrodes are connected to a circuit to which a microcomputer, a regulator and a regulated power supply are connected in a state where a power terminal of the microcomputer is connected via a bypass capacitor in the circuit, and are set such that a characteristic impedance is electrically uniform with the microcomputer, the regulator and the regulated power supply.
Assignees
Inventors
Classifications
comprising an electrode which is floating · CPC title
Power supply means, e.g. to the switch driver · CPC title
characterised by the number of electrodes · CPC title
Capacitive touch switches · CPC title
constructional details · CPC title
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Frequently asked questions
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- What does patent US12587194B2 cover?
- A capacitive button capable of improving tolerance to electrostatic discharge is provided. The capacitive button includes: a pair of sensor electrodes which are provided side by side; a floating electrode which is arranged on a front side of the pair of sensor electrodes via an insulating layer; and a ground electrode which is arranged so as to surround the floating electrode, and is grounded w…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification H03K17/955. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 24 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).