Granted Patent B2

US 12,267,068 · App. 18/579,835 · Granted Apr 1, 2025

Inventors: Ryo Nakae (Okayama, JP); Takehiko Nara (Okayama, JP); Naoki Tanaka (Okayama, JP)

Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

H03K17/962H01H13/00H01H13/52H03K17/975H04N23/51G06F3/0414G06F2203/04105H03K2217/96071

Abstract

Claims (23)

1. A detection method comprising:

obtaining periodically and repeatedly sensor values output from a capacitive sensor, and storing, in memory, the sensor values obtained as sensor data, the sensor data being time-series data;

determining whether the sensor values obtained exceed a first threshold;

calculating, as a first difference value of each of target sensor values, a difference between the target sensor value and a sensor value immediately before the target sensor value, the target sensor values including a sensor value determined to exceed the first threshold and past sensor values in reverse chronological order from the sensor value determined to exceed the first threshold;

calculating, as a second difference value of each of the target sensor values, a difference between (i) the first difference value of the target sensor value and (ii) the first difference value of the sensor value immediately before the target sensor value;

comparing each of the second difference values calculated and a second threshold, and selecting one sensor value from the sensor data based on a result of the comparing; and

outputting the one sensor value selected.

2. The detection method according to claim 1 , wherein

in the comparing, a sensor value immediately before a target sensor value corresponding to a second difference value that exceeds the second threshold is selected based on the result of the comparing.

3. The detection method according to claim 1 , wherein

in the comparing, when there are a plurality of second difference values that exceed the second threshold based on the result of the comparing, a sensor value immediately before an oldest sensor value is selected from among target sensor values corresponding to the plurality of second difference values.

4. The detection method according to claim 1 , wherein

the outputting includes further outputting a result of the determining.

5. A detection device comprising:

an obtainer that obtains periodically and repeatedly sensor values output from a capacitive sensor, and stores, in memory, the sensor values obtained as sensor data, the sensor data being time-series data;

a determiner that determines whether the sensor values obtained exceed a first threshold;

a first calculator that calculates, as a first difference value of each of target sensor values, a difference between the target sensor value and a sensor value immediately before the target sensor value, the target sensor values including a sensor value determined to exceed the first threshold and past sensor values in reverse chronological order from the sensor value determined to exceed the first threshold;

a second calculator that calculates, as a second difference value of each of the target sensor values, a difference between (i) the first difference value of the target sensor value and (ii) the first difference value of the sensor value immediately before the target sensor value;

a comparator that compares each of the second difference values calculated and a second threshold, and selects one sensor value from the sensor data based on a result of the comparison; and

an outputter that outputs the sensor value selected.

6. A detection system comprising:

the detection device according to claim 5 ; and

the capacitive sensor.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (17)