# US 12,602,123 B2 · Electronic pen

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,602,123 B2
- Document ID: US12602123B2
- Status: Granted
- Kind: B2
- Application number: 18/968,945
- Filed: 2024-12-04
- Published: 2025-03-20
- Granted: 2026-04-14
- Earliest claimed: 2022-12-05
- Assignees: Wacom Co., Ltd.
- Applicants: Wacom Co., Ltd.
- Inventors: Naoya Nishizawa; Tatsunori Kato; Hiroaki Shiokawa; Kentaro Matsumoto
- Web page: https://patentgrep.com/patent/US12602123B2

## CPC

- G06F 3/039: Accessories therefor, e.g. mouse pads
- G06F 3/03545: {Pens or stylus}
- G06F 3/0414: {using force sensing means to determine a position}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

Provided is an electronic pen including an electronic pen main body unit having a pen shape, and having a pen tip that, in operation, performs a position indication, the pen tip being formed in an end portion on a first end side of the electronic pen main body unit in an axial direction of the electronic pen main body unit, a weight member; and an attachment portion that detachably attaches to the weight member, the attachment portion being formed in an end portion on a second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit.

## Claims

### Claim 1

An electronic pen comprising:
an electronic pen main body unit having a pen shape, and having a pen tip that, in operation, performs a position indication, the pen tip being formed in an end portion on a first end side of the electronic pen main body unit in an axial direction of the electronic pen main body unit;
a weight member;
an attachment portion that detachably attaches to the weight member, the attachment portion being formed in an end portion on a second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit; and
a cap case unit configured to be detachably engaged with the second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit such that the cap case unit covers the attachment portion in the end portion on the second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit,
wherein the cap case unit has a space portion configured to house the weight member attached to the attachment portion when the cap case unit is engaged with the second end side in the axial direction of the electronic pen main body unit,
wherein the attachment portion is provided with an elastic member configured to bias the weight member attached to the attachment portion to the second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit, and the weight member is configured not to move in the axial direction when the cap case unit is engaged with the second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit, and
wherein the elastic member is formed by a coil spring, and a first end of the coil spring, the first end being on a pen tip side in a direction in which the coil spring elastically extends or contracts, is fixed to the attachment portion of the electronic pen main body unit.

### Claim 2 (depends on 1)

The electronic pen according to claim 1, wherein:
a fitting portion configured to be fitted to the attachment portion is formed in the weight member, and
the fitting portion includes a fitting portion-diameter portion smaller than an inside diameter of the coil spring, the fitting portion-diameter portion being on an end side of an outside diameter portion larger than the inside diameter of the coil spring.

### Claim 3 (depends on 1)

The electronic pen according to claim 1, wherein:
the weight member is configured to change a gravity center position in the axial direction of the electronic pen main body unit to the second end side in the axial direction of the electronic pen main body unit.

### Claim 4 (depends on 1)

The electronic pen according to claim 1, wherein:
the weight member is configured to change a weight of the weight member, and to change a gravity center position in the axial direction of the electronic pen main body unit to the second end side of the electronic pen main body unit in the axial direction of the electronic pen main body unit.