Position indicator of electromagnetic induction system and electronic ink cartridge

Patent metadata

Field	Value
Publication number	US-9297633-B2
Application number	US-201313924381-A
Country	US
Kind code	B2
Filing date	Jun 21, 2013
Priority date	Sep 13, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

An electronic ink cartridge includes, in a direction of a central axis within a cylindrical body, a core body extended out from a distal end of the cylindrical body, a coupling member disposed on a side of a proximal end of the cylindrical body, a coil housed between the core body and the coupling member and having a predetermined inductance, and a pressure sensitive element whose capacitance changes according to pressure applied to the core body. Two terminals of the coil are electrically connected respectively to two terminals of the pressure sensitive element to thereby form two terminals of a resonance circuit formed by the coil and the pressure sensitive element. A connecting terminal electrically connected to at least one of the two terminals of the resonance circuit is disposed on a proximal end surface side of the coupling member to be accessible thereon from outside.

First claim

The invention claimed is:

1. An electronic ink cartridge of an electromagnetic induction system, the electronic ink cartridge being structured to be replaceably inserted in a pen-shaped position indicator that electromagnetically indicates a position on a sensor surface, the electronic ink cartridge comprising:
a cylindrical body structured to be replaceably inserted in a casing of the pen-shaped position indicator;
a core body partially housed in the cylindrical body and extended out from a distal end of the cylindrical body;
a coupling member disposed inside the cylindrical body proximal to the core body, the coupling member having a generally cylindrical shape including proximal and distal end surfaces and a peripheral side surface defined between the proximal and distal end surfaces, wherein the peripheral side surface defines at least one recessed portion;
a coil housed inside the cylindrical body between the core body and the coupling member, the coil having a predetermined inductance; and
a pressure sensitive element housed in the cylindrical body proximal to the core body, whose capacitance changes according to pressure applied to the core body,
wherein one terminal and another terminal of the coil are electrically connected respectively to one terminal and another terminal of the pressure sensitive element to thereby form one terminal and another terminal, respectively, of a resonance circuit that is formed by the coil and the pressure sensitive element inside the cylindrical body, and
a connecting terminal electrically connected to at least one of the one terminal and the another terminal of the resonance circuit is disposed on the proximal end surface side of the coupling member to be accessible thereon from outside, wherein at least one of the one terminal and the another terminal of the coil is electrically connected with the connecting terminal at the at least one recessed portion defined in the peripheral side surface of the coupling member.

2. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein a pair of connecting terminals electrically connected respectively to the one terminal and the another terminal of the resonance circuit is disposed on the proximal end surface side of the coupling member.

3. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein a capacitor circuit is coupled to the connecting terminal disposed on the proximal end surface side of the coupling member, and the capacitor circuit is connected in parallel with the resonance circuit, whereby a resonance frequency of the resonance circuit is made changeable.

4. The electronic ink cartridge of the electromagnetic induction system according to claim 3 ,
wherein the capacitor circuit is housed in the cylindrical body.

5. The electronic ink cartridge of the electromagnetic induction system according to claim 3 ,
wherein the capacitor circuit includes a first capacitor circuit and a second capacitor circuit, and a plurality of resonance frequencies can be set by the first capacitor circuit and the second capacitor circuit.

6. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the coil is disposed adjacent to the core body, and the pressure sensitive element is disposed adjacent to or inside of the coupling member.

7. The electronic ink cartridge of the electromagnetic induction system according to claim 6 ,
wherein at least the pressure sensitive element and the coupling member have a unitized structure.

8. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the pressure sensitive element is disposed adjacent to the core body, and the coil is disposed adjacent to the coupling member.

9. The electronic ink cartridge of the electromagnetic induction system according to claim 8 ,
wherein at least the pressure sensitive element and the coil have a unitized structure.

10. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the cylindrical body is formed by coupling a plurality of cylindrical bodies to each other, the core body is extended out from a distal end of one cylindrical body, and the coupling member is disposed adjacent to a proximal end of said one cylindrical body.

11. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the pressure sensitive element is formed by a semiconductor device.

12. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein a biasing member for biasing the core body in a distal-to-proximal direction is disposed inside of the cylindrical body adjacent to the distal end of the cylindrical body.

13. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the core body has a rod shape, and the core body is extended out from the cylindrical body so as to be replaceable.

14. The electronic ink cartridge of the electromagnetic induction system according to claim 1 ,
wherein the connecting terminal electrically connected to the one terminal of the resonance circuit is disposed on the proximal end surface side of the coupling member, the cylindrical body is made of a conductive non-magnetic material, and the another terminal of the resonance circuit is connected to the conductive cylindrical body, whereby the connecting terminal and the cylindrical body form a pair of connecting terminals.

15. The electronic ink cartridge of the electromagnetic induction system according to claim 1 , further comprising an information transmitting circuit storing predetermined information,
wherein the information transmitting circuit is connected to the one terminal and the another terminal of the resonance circuit to transmit the predetermined information via the coil.

16. A pen-shaped position indicator of an electromagnetic induction system that electromagnetically indicates a position on a sensor surface, the position indicator comprising:
a) a cylindrical indicator casing;
b) an electronic ink cartridge replaceably inserted inside the cylindrical indicator casing, the electronic ink cartridge including:
a cylindrical cartridge body,
a core body partially housed in the cylindrical cartridge body and extended out from a distal end of the cylindrical cartridge body,
a coupling member disposed inside the cylindrical cartridge body proximal to the core body, the coupling member having a generally cylindrical shape including proximal and distal end surfaces and a peripheral side surface defined between the proximal and distal end surfaces, wherein the peripheral side surface defines at least one recessed portion,
a coil housed inside the cylindrical cartridge body between the core body and the coupling member, the coil having a predetermined inductance, and
a pressure sensitive element housed in the cylindrical cartridge body proximal to the core body, whose capacitance changes according to the pressure applied to the core body,
in which one terminal and another terminal of the coil are electrically connected respectively to one terminal and another terminal of the pressure sensitive element to thereby form one terminal and another terminal, respectively, of a resonance circuit that is formed by the coil and the pressure sensitive element inside the cylindrical cartridge body, and
a connecting terminal electrically connected to at least one of the one terminal and the another terminal of the resonance circuit

Assignees

• Wacom Co Ltd

Inventors

• Obata Masayuki

Classifications

• G06F3/03545 Primary

  Pens or stylus · CPC title

• Y10T137/8242

  Electrical · CPC title

• G06F3/046

  by electromagnetic means · CPC title

• G01B7/003 Primary

  for measuring position, not involving coordinate determination (coordinate measuring G01B7/004) · CPC title

• G06F3/033 Primary

  Pointing devices displaced or positioned by the user {, e.g. mice, trackballs, pens or joysticks}; Accessories therefor (digitisers characterised by the transducing means G06F3/041) · CPC title