Detection device and illumination switching device

Patent metadata

Field	Value
Publication number	US-11831308-B2
Application number	US-202016847308-A
Country	US
Kind code	B2
Filing date	Apr 13, 2020
Priority date	Nov 6, 2018
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A detection device includes a panel having opposed main surfaces including an operation surface and a rear surface. A support structure is located on at least one of the main surfaces and prevents warping of the panel while permitting the operation surface to be deformed in response to a pressing operation applied to the operation surface. A sensor for sensing the pressing operation applied to the operation surface is provided on one of the main surfaces at a location where at least a portion of the sensor does not overlap the support structure in plan view.

First claim

The invention claimed is:

1. A detection device comprising:
a panel having opposed main surfaces including an operation surface and a rear surface;
a support structure which prevents warping of the panel while permitting the operation surface to be deformed in response to a pressing operation applied to the operation surface, the support structure comprising first, second and third supports, each located on a respective one of the main surfaces of the panel, the third support being located between the first and second supports in plan view; and
first and second sensors provided on respective ones of the main surfaces of the panel for sensing the pressing operation applied to the operation surface, the first sensor being located between the first and third supports in plan view, the second sensor being located between the second and third supports in plan view, at least a portion of the first sensor does not overlap the support structure in plan view.

2. The detection device according to claim 1 , wherein:
the first and second sensors provide respective outputs indicative of the pressing operation applied to the operation surface; and
the detection device further includes a transmitter receiving the respective outputs of the first and second sensors and transmitting an output signal, indicative of the pressing operation, to a remote receiver.

3. The detection device according to claim 1 , wherein the first, second and third supports are located on the rear surface.

4. The detection device according to claim 3 , wherein the supports are located at opposed lateral ends of the rear operation surface.

5. The detection device according to claim 1 , wherein the panel lies in a plane and the first and second supports extend parallel to the plane and parallel to each other.

6. The detection device according to claim 5 , wherein the first and second supports are located at opposite lateral ends of the panel.

7. The detection device according to claim 1 , wherein the first and second sensors are respective portions of a single sensor that overlaps and straddles the third support in plan view.

8. The detection device according to claim 7 , wherein the single sensor comprises:
a piezoelectric member which overlaps and straddles the third support in plan view; and
first and second electrodes provided on a main surface on the piezoelectric member on opposite sides of the third support, respectively.

9. The detection device according to claim 1 , wherein the support structure is integrally formed with the panel.

10. The detection device according to claim 1 , wherein:
the first and second sensors provide respective outputs that are indicative of the pressing operation applied to the operation surface; and
the outputs of the first and second sensors are connected to a transmitter that transmits a signal to a remove receiver, the transmitter includes a signal comparison unit that compares the outputs of the first and second sensors and the transmitter generates the transmitted signal as a function of the comparison.

11. The detection device according to claim 1 , wherein:
the first sensor generates an output indicative of the pressing operation applied to the operation surface; and
the detection device includes a transmitter connected to the first sensor and transmitting a signal to a remote receiver, the transmitter including a frequency discriminator that determines whether the output generated by the first sensor is indicative of an intended pressing operation as a function of a frequency of the output of the sensor.

12. The detection device according to claim 1 wherein:
the first, second and third supports extend in a first direction;
the first sensor includes a piezoelectric member that comprises a chiral polymer; and
a uniaxial stretching direction of the piezoelectric member is not parallel to the first direction.

13. An illumination switching device comprising:
a light source;
a switch for turning the light source on and off; and
the detection device according to claim 10 , wherein the switch is controlled by the remote receiver as a function of the transmitted signal .

14. The illumination switching device according to claim 13 , wherein a determination is made as to whether to turn the light source on or off by (a) the signal comparison unit, (b) a frequency discriminator that determines whether the output generated by the fist sensor is indicative of an intended pressing operation as a function of a frequency of the output of the sensor, or (c) both the signal comparison unit and the frequency discriminator.

15. The detection device according to claim 1 , wherein:
the first and second sensors are located on the operation surface; and
the detection device further comprises a surface film which is provided on the operation surface in such a manner that the first and second sensors are sandwiched between the operation surface and the surface film.

16. The detection device according to claim 15 , wherein the surface film covers the entire operation surface.

Assignees

• Murata Manufacturing Co

Inventors

• Mori Kenichi
• Ando Masamichi

Classifications

• H03K17/9643 Primary

  using a plurality of detectors, e.g. keyboard · CPC title

• H10N30/10513

  Electricity · mapped topic

• H10N30/302

  Sensors · CPC title

• H10N30/857

  Macromolecular compositions · CPC title

• H03K17/964 Primary

  Piezoelectric touch switches · CPC title