# US 2017/0287670 A1 · Emitter and x-ray tube > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0287670 A1 - Document ID: US20170287670A1 - Status: Published application - Kind: A1 - Application number: 15/473,888 - Filed: 2017-03-30 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: Toshiba Electron Tubes & Devices Co., Ltd. - Applicants: Toshiba Electron Tubes & Devices Co., Ltd. - Inventors: Masataka UEKI; Masahiko Tezuka - Web page: https://patentgrep.com/patent/US20170287670A1 ## CPC - H01J 35/064: {Details of the emitter, e.g. material or structure (H01J35/065 takes precedence)} - H01J 35/10: Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) ## Abstract According to one embodiment, an emitter comprise a base portion including an electron emission surface from which electrons are emitted, a pair of leg portions applying a voltage to the electron emission surface, and a rib portion formed by bending an edge of the base portion to a side opposite to the electron emission surface, on at least a part of an outline of the electron emission surface. ## Claims ### Claim 1 An emitter comprising: a base portion including an electron emission surface from which electrons are emitted; a pair of leg portions applying a voltage to the electron emission surface; and a rib portion formed by bending an edge of the base portion to a side opposite to the electron emission surface, on at least a part of an outline of the electron emission surface. ### Claim 2 (depends on 1) The emitter of claim 1, wherein a slit for forming a current path on the electron emission surface is formed at the base portion. ### Claim 3 (depends on 2) The emitter of claim 2, wherein the slit is formed along the rib portion to divide the rib portion. ### Claim 4 (depends on 3) The emitter of claim 3, wherein the pair of leg portions are provided at opposed portions at the outline of the electron emission surface, the rib portions are provided at right and left parts between the pair of leg portions, and the slits are alternately formed on right and left sides between the pair of leg portions. ### Claim 5 (depends on 1) The emitter of claim 1, wherein through holes are formed on the electron emission surface. ### Claim 6 (depends on 5) The emitter of claim 5, wherein the through holes are formed at positions close to the rib portions. ### Claim 7 (depends on 1) The emitter of claim 1, wherein the outline of the electron emission surface is formed in a rectangular shape, the leg portions are provided on two opposed rectangular sides, and the pair of rib portions are provided on two other sides. ### Claim 8 An emitter comprising: a base portion including an electron emission surface from which electrons are emitted; a pair of leg portions applying a voltage to the electron emission surface; and a rib portion protruding from the base portion toward a side surface opposite to the electron emission surface, on at least a part of an outline of the electron emission surface. ### Claim 9 (depends on 8) The emitter of claim 8, wherein a slit for forming a current path on the electron emission surface is formed at the base portion. ### Claim 10 (depends on 9) The emitter of claim 9, wherein the slit is formed along the rib portion to divide the rib portion. ### Claim 11 (depends on 10) The emitter of claim 10, wherein the pair of leg portions are provided at opposed portions at the outline of the electron emission surface, the rib portions are provided at right and left parts between the pair of leg portions, and the slits are alternately formed on right and left sides between the pair of leg portions. ### Claim 12 (depends on 8) The emitter of claim 8, wherein through holes are formed on the electron emission surface. ### Claim 13 (depends on 12) The emitter of claim 12, wherein the through holes are formed at positions close to the rib portions. ### Claim 14 (depends on 8) The emitter of claim 8, wherein the outline of the electron emission surface is formed in a rectangular shape, the leg portions are provided on two opposed rectangular sides, and the pair of rib portions are provided on two other sides. ### Claim 15 An X-ray tube, comprising: a vacuum envelope; a cathode provided in the vacuum envelope to emit electrons, the cathode comprising an emitter, the emitter comprising a base portion including an electron emission surface from which electrons are emitted, a pair of leg portions applying a voltage to the electron emission surface, and a rib portion formed by bending an edge of the base portion to a side opposite to the electron emission surface, on at least a part of an outline of the electron emission surface; and an anode provided in the vacuum envelope, allowing the electrons emitted from the cathode to collide and generating X rays. ### Claim 16 (depends on 15) The emitter of claim 15, wherein a slit for forming a current path on the electron emission surface is formed at the base portion. ### Claim 17 (depends on 16) The emitter of claim 16, wherein the slit is formed along the rib portion to divide the rib portion. ### Claim 18 An X-ray tube, comprising: a vacuum envelope; a cathode provided in the vacuum envelope to emit electrons, the cathode comprising an emitter, the emitter comprising a base portion including an electron emission surface from which electrons are emitted, a pair of leg portions applying a voltage to the electron emission surface, and a rib portion protruding from the base portion toward a side surface opposite to the electron emission surface, on at least a part of an outline of the electron emission surface; and an anode provided in the vacuum envelope, allowing the electrons emitted from the cathode to collide and generating X rays. ### Claim 19 (depends on 18) The emitter of claim 18, wherein a slit for forming a current path on the electron emission surface is formed at the base portion. ### Claim 20 (depends on 18) The emitter of claim 18, wherein the slit is formed along the rib portion to divide the rib portion.