# US 2010/0164907 A1 · Stylus and electronic device using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164907 A1 - Document ID: US20100164907A1 - Status: Published application - Kind: A1 - Application number: 12/489,538 - Filed: 2009-06-23 - Published: 2010-07-01 - Earliest claimed: 2008-12-27 - Assignees: Shenzhen Futaihong Precision Industry Co., Ltd.; Chi Mei Communication Systems, Inc. - Inventors: RUI-XUE ZHAO - Web page: https://patentgrep.com/patent/US20100164907A1 ## CPC - G06F 1/1626: {with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]} - G06F 2200/1632: Pen holder integrated in the computer - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A stylus includes a tube body, a touch end connected to the tube body, an inflatable balloon enwrapping the tube body such that the tube body and the balloon cooperatively define a sealed chamber, and an inflating mechanism for inserting gas into the sealed chamber to inflate the balloon and therefore, the size of the stylus is adjustable and convenient for using. ## Claims ### Claim at position 1 1 A stylus, comprising: a tube body; a touch end connected to the tube body; an inflatable balloon enwrapping the tube body such that tube body and the balloon cooperatively define a sealed chamber; and an inflating mechanism for inserting gas into the sealed chamber to inflate the balloon. ### Claim 2 (depends on 1) The stylus of claim 1, wherein the stylus further comprises a gas intake through which the inflating mechanism inserts gas into the sealed chamber and a gas outlet through which the gas may be vented out of the sealed chamber to allow the balloon to return to an original shape. ### Claim 3 (depends on 1) The stylus of claim 1, wherein the tube body is a substantially hollow metallic cylinder, and defines a gas conduit extending therethrough and a hole communicating the gas conduit and the sealed chamber. ### Claim 4 (depends on 3) The stylus of claim 3, wherein the tube body further comprises a first end, a second end opposite to the first end, and a circumferential surface defining two annular grooves adjacent to the first and second ends respectively for attaching the balloon to the tube body. ### Claim 5 (depends on 4) The stylus of claim 4, wherein the inflating mechanism comprises a piston, a piston shaft connected to the piston, and a sealing member sleeved on the piston. ### Claim 6 (depends on 5) The stylus of claim 5, wherein the sealing member is elastic and substantially bowl-shaped, with an opening towards the touch end. ### Claim 7 (depends on 5) The stylus of claim 5, wherein the inflating mechanism comprises an elastic member positioned between the touch end and the piston. ### Claim 8 (depends on 7) The stylus of claim 7, wherein the elastic member is substantially metallic and coiled, and has an outer diameter smaller than a diameter of the gas conduit. ### Claim 9 (depends on 1) The stylus of claim 1, wherein the balloon is made of rubber, latex, polychloroprene, or nylon fabric. ### Claim 10 (depends on 1) The stylus of claim 1, wherein the balloon is substantially pipe-shaped. ### Claim 11 (depends on 4) The stylus of claim 4, wherein the gas intake comprises a valve member and an obstructing member movably received in the valve member for controlling the gas to flow into the sealed chamber. ### Claim 12 (depends on 11) The stylus of claim 11, wherein the valve member defines a hole for communicating the gas conduit and the sealed chamber, and the obstructing body is movably received in the hole. ### Claim 13 (depends on 12) The stylus of claim 12, wherein the valve member comprises a conical inner surface whose largest diameter is adjacent to the sealed chamber, and the obstructing member is substantially spherical and movably received in a chamber defined by the inner surface. ### Claim 14 (depends on 13) The stylus of claim 13, wherein the gas intake further comprises a protruding portion mounted in the inner surface, and the protruding portion extends into the hole to prevent the obstructing body from sliding out of the valve member. ### Claim 15 (depends on 2) The stylus of claim 2, wherein the gas outlet comprises a connecting member connected to the balloon and a snap button seal-connected to the connecting member, the connecting member defines an opening communicating with the sealed chamber. ### Claim 16 An electronic device, comprising: a main body defining an accommodating hole; a touch panel mounted on the main body; and a stylus received in the accommodating hole, the stylus comprising: a tube body; a touch end connected to the tube body; an inflatable balloon enwrapping the tube body such that tube body and the balloon cooperatively define a sealed chamber; and an inflating mechanism for inserting gas into the sealed chamber to inflate the balloon. ### Claim 17 (depends on 16) The electronic device of claim 16, wherein the accommodating hole substantially extends along the longitudinal axis of the main body. ### Claim 18 (depends on 16) The electronic device of claim 16, wherein the stylus further comprises a gas intake through which the inflating mechanism insert gas into the sealed chamber and a gas intake through which the gas venting out of the sealed chamber to allow the balloon to return to an original shape. ### Claim 19 (depends on 16) The electronic device of claim 16, wherein the inflating mechanism comprises a piston, a piston shaft connected to the piston, a sealing member sleeved on the piston, and an elastic member positioned between the touch end and the piston. ### Claim 20 An electronic device, comprising: a stylus; a main body defining an accommodating hole to receive the stylus; and a touch panel mounted on the main body; wherein the stylus comprising: a tube body; a touch end connected to the tube body; an inflatable balloon enwrapping the tube body such that tube body and the balloon cooperatively define a sealed chamber; an inflating mechanism for inserting gas into the sealed chamber to adjust the external diameter of the stylus.