Position detection sensor and position detection device

Patent metadata

Field	Value
Publication number	US-11725963-B2
Application number	US-202217583986-A
Country	US
Kind code	B2
Filing date	Jan 25, 2022
Priority date	Mar 15, 2021
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

The present disclosure is directed to a position detection sensor of an electromagnetic induction type connected to a position detection circuitry. The position detection sensor includes a circular substrate, a plurality of first loop coils arranged in a first direction on the circular substrate, and a plurality of second loop coils arranged in a second direction on the circular substrate, the second direction intersecting the first direction. Each of the plurality of first loop coils includes a straight portion extending in the second direction and a circumferential portion disposed along an outer edge of the circular substrate, and each of the plurality of second loop coils includes a straight portion extending in the first direction and a circumferential portion disposed along the outer edge of the circular substrate.

First claim

The invention claimed is:

1. A position detection sensor of an electromagnetic induction type connected to a position detection circuitry, comprising:
a circular substrate;
a plurality of first loop coils arranged in a first direction on the circular substrate; and
a plurality of second loop coils arranged in a second direction on the circular substrate, the second direction intersecting the first direction,
wherein each of the plurality of first loop coils includes a straight portion extending in the second direction and a circumferential portion extending along an outer edge of the circular substrate, and
each of the plurality of second loop coils includes a straight portion extending in the first direction and a circumferential portion extending along the outer edge of the circular substrate.

2. The position detection sensor according to claim 1 , wherein, among the plurality of first loop coils,
each of first and second loop coils, which are positioned at opposite sides of the circular substrate, includes the straight portion and the circumferential portion having an arc shape, and
each of other loop coils, which are positioned between the first and second loop coils, includes a plurality of the straight portions opposed to each other and a plurality of the circumferential portions opposed to each other.

3. The position detection sensor according to claim 1 ,
wherein each of the plurality of first loop coils has a plurality of turns,
the plurality of first loop coils include first and second end loop coils arranged at opposite sides of the circular substrate, and other loop coils arranged between the first and second end loop coils,
each of the first and second end loop coils includes a plurality of the straight portions and a plurality of the circumferential portions, each having an arc shape and extending along the outer edge of the circular substrate,
among the plurality of the straight portions of each of the first and second end loop coils, straight portions of different turns are arranged at determined intervals in the first direction,
among the plurality of the circumferential portions of each of the first and second end loop coils, circumferential portions of the different turns are arranged so as to be close to each other,
each of the other loop coils includes a plurality of the straight portions opposed to each other and a plurality of the circumferential portions opposed to each other, and,
among the plurality of straight portions of each of the other loop coils, straight portions of different turns are arranged at determined intervals in the first direction.

4. The position detection sensor according to claim 1 , wherein, among the plurality of second loop coils,
each of first and second loop coils, which are positioned at opposite sides of the circular substrate includes the straight portion and the circumferential portion having an arc shape, and
each of other loop coils, which are positioned between the first and second loop coils, includes a plurality of the straight portions opposed to each other and a plurality of the circumferential portions opposed to each other.

5. The position detection sensor according to claim 1 ,
wherein each of the plurality of second loop coils has a plurality of turns,
the plurality of second loop coils include first and second end loop coils arranged at opposite sides of the circular substrate, and other loop coils arranged between the first and second end loop coils,
each of the first and second end loop coils includes a plurality of the straight portions and a plurality of the circumferential portions each having an arc shape and extending along the outer edge of the circular substrate,
among the plurality of the straight portions of each of the first and second end loop coils, straight portions of different turns are arranged at determined intervals in the second direction,
among the plurality of the circumferential portions of each of the first and second end loop coils, circumferential portions of the different turns are arranged so as to be close to each other,
each of the other loop coils includes a plurality of the straight portions opposed to each other and a plurality of the circumferential portions opposed to each other, and,
among the plurality of straight portions of each of the other loop coils, straight portions of different turns are arranged at determined intervals in the second direction.

6. The position detection sensor according to claim 1 , wherein the plurality of first loop coils and the plurality of second loop coils are arranged on different surfaces of the circular substrate.

7. The position detection sensor according to claim 1 , wherein each of the plurality of first and second loop coils includes a sensor portion disposed on the circular substrate and a routing portion routed from the circular substrate and connected to the position detection circuitry.

8. The position detection sensor according to claim 1 , wherein the circular substrate, the plurality of first loop coils, and the plurality of second loop coils are configured as a flexible printed circuit.

9. The position detection sensor according to claim 1 , further comprising:
one or more outermost loop coils with one or more turns that are arranged on an outer side of the plurality of first and second loop coils arranged on the circular substrate and that are extending along the outer edge of the circular substrate.

10. The position detection sensor according to claim 1 , further comprising:
one or more outermost loop coils with one or more turns that are arranged on an outer side of the plurality of first and second loop coils arranged on the circular substrate and that are extending along the outer edge of the circular substrate,
wherein the one or more outermost loop coils are used to check whether or not an electronic pen is present on an inner side of the one or more outermost loop coils.

11. The position detection sensor according to claim 1 , further comprising:
one or more outermost loop coils with one or more turns that are arranged on an outer side of the plurality of first and second loop coils arranged on the circular substrate and that are extending along the outer edge of the circular substrate,
wherein the one or more outermost loop coils are configured to transmit magnetic signals, and the plurality of first loop coils and the plurality of second loop coils are configured to receive magnetic signals.

12. A position detection device of an electromagnetic induction type, comprising:
a position detection sensor; and
a position detection circuitry,
wherein the position detection sensor includes
a circular substrate,
a plurality of first loop coils arranged in a first direction on the circular substrate, and
a plurality of second loop coils arranged in a second direction on the circular substrate, the second direction intersecting the first direction,

each of the plurality of first loop coils includes a straight portion extending in the second direction and a circumferential portion extending along an outer edge of the circular substrate,
each of the plurality of second loop coils includes a straight portion extending in the first direction and a circumferential portion extending along the outer edge of the circular substrate, and
the position detection circuitry includes
a signal supply circuit configured to sequentially supply signals to the plurality of first loop coils and the plurality of second loop coils in a transmission period, and
a tilt detection circuit configured to sequentially receive signals from the plurality of first loop coils and the plurality of second loop coi

Assignees

• Wacom Co Ltd

Inventors

• Matsuura Hikaru
• Izumisawa Takeru
• Ito Masamitsu

Classifications

• G05G9/047

  the controlling member being movable by hand about orthogonal axes, e.g. joysticks {(for switches H01H25/04)} · CPC title

• G06F3/046

  by electromagnetic means · CPC title

• G06F3/03545 Primary

  Pens or stylus · CPC title

• G01D5/20 Primary

  by varying inductance, e.g. by a movable armature · CPC title

• G01B7/30

  for measuring angles or tapers; for testing the alignment of axes · CPC title