POINTER DETECTION SENSOR AND POINTER DETECTION APPARATUS

• US 20160239125A1
• Filed: 02/11/2016
• Published: 08/18/2016
• Est. Priority Date: 08/16/2013
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Wacom Co Limited (Wacom)
• Inventors: Tsutsumi, Yuji
• Granted Patent: US 9,489,100 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A plurality of first conductors and a plurality of second conductors disposed in first and second directions crossing with each other are disposed in an opposing relationship to each other and in a spaced relationship by a determined distance from each other, and a variation of a capacitance formed between any of the first conductors and any of the second conductors based on a variation of a distance between the first conductor and the second conductor when one of the first conductor and the second conductor is deflected by pressing by a pointer is detected to detect a position pointed to by the pointer. A spacer is disposed between the first and second conductors in a region of a cross point such that a deflection amount of one of the first conductor and the second conductor by the pressing by the pointer has a value higher in a region other than the region of the cross point than in the region of the cross point at which the first conductor and the second conductor cross and overlap with each other.

Claims

1. A pointer detection sensor of a capacitance type, comprising:

a plurality of first conductors disposed in a first direction;

a plurality of second conductors disposed in a second direction crossing with the first direction, the plurality of first conductors and the plurality of second conductors disposed in an opposing relationship to each other and spaced apart from each other, wherein, in operation, a variation of a capacitance formed between any of the first conductors and any of the second conductors based on a variation of a distance between the first conductor and the second conductor when one of the first conductor and the second conductor is deflected by pressing by a pointer is detected to indicate a position pointed to by the pointer; and

one or more spacers disposed only in regions of cross points between conductors of the plurality of first conductors and conductors of the plurality of second conductors.

2. The pointer detection sensor according to claim 1, wherein, in operation, a deflection amount of one of the first and second conductors in response to pressing by the pointer has a value higher in a region other than a cross point region than in a cross point region.

3. The pointer detection sensor according to claim 1, wherein the one or more spacers are positioned in central regions of the cross point regions.

4. The pointer detection sensor according to claim 1, wherein two or more spacers are formed in a central region of a cross point region.

5. The pointer detection sensor according to claim 3, wherein the central regions have a quadrangular shape, and spacers are positioned at each of four corners of the central regions of the quadrangular shape.

6. The pointer detection sensor according to claim 3, wherein the one or more spacers have a pillar shape and a single spacer is positioned in the central regions of each cross point region.

7. The pointer detection sensor according to claim 3, wherein lengths between the central regions in the regions of adjacent ones of the cross points in the first direction and the second direction are greater than lengths of the central regions in the region of the cross points in the first direction and the second direction.

8. The pointer detection sensor according to claim 1, wherein the one or more spacers are positioned on first conductors of respective cross points and have a height, which, in operation, maintains a space between the first conductor and the second conductor of the respective cross points.

9. The pointer detection sensor according to claim 1, wherein the one or more spacers are made of a hard material.

10. The pointer detection sensor according to claim 1, wherein the one or more spacers have elastic bodies.

11. The pointer detection sensor according to claim 10, wherein the one or more spacers bridge a first conductor and a second conductor of a respective cross point and are bonded to each of the first conductor and the second conductor of the respective cross point.

12. The pointer detection sensor according to claim 1, wherein transparent liquid is enclosed between the first conductor and the second conductor.

13. The pointer detection sensor according to claim 12, wherein

the transparent liquid comprises an ultraviolet-curable optical elastic resin, and

the one or more spacers comprise portions of the ultraviolet-curable optical elastic resin cured by irradiation of ultraviolet rays.

14. The pointer detection sensor according to claim 1, wherein the plurality of first conductors are positioned on a first substrate and the plurality of second conductors are positioned on a second substrate, and the first substrate and the second substrate are sealed at peripheral portions thereof by a member, the member maintaining a distance between the first conductors and the second conductors at the peripheral portions of the first and second substrates.

15. A pointer detection apparatus, comprising:

a pointer detection sensor of a capacitance type, having;

a plurality of first conductors disposed in a first direction;

a plurality of second conductors disposed in a second direction crossing with the first direction, the plurality of first conductors and the plurality of second conductors disposed in an opposing relationship to each other and spaced apart from each other, wherein, in operation, a variation of a capacitance formed between any of the first conductors and any of the second conductors based on a variation of a distance between the first conductor and the second conductor when one of the first conductor and the second conductor is deflected by pressing by a pointer is detected to indicate a position pointed to by the pointer; and

one or more spacers disposed only in regions of cross points between conductors of the plurality of first conductors and conductors of the plurality of second conductors;

an alternating current signal supplying circuit, which, in operation, supplies an alternating current signal to one or more of the plurality of first conductors; and

signal reception circuitry, which, in operation, determines a position pointed to by the pointer based on one or more signals received from the plurality of second conductors indicative of the variation of the capacitance in response to pressing corresponding to the position pointed to by the pointer.

16. The pointer detection apparatus according to claim 15, wherein the signal reception circuitry determines pressing force by the pointer based on the one or more signals indicative of the variation of the capacitance.