# US 10,320,159 B2 · High frequency discharge ignition device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,320,159 B2 - Document ID: US10320159B2 - Status: Granted - Kind: B2 - Application number: 15/710,899 - Filed: 2017-09-21 - Published: 2018-09-27 - Granted: 2019-06-11 - Earliest claimed: 2017-03-23 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Yasuyuki Shimizu; Takaaki Tanaka; Akira Nakagawa - Web page: https://patentgrep.com/patent/US10320159B2 ## CPC - H01T 13/41: with interference suppressing or shielding means - F02P 3/01: Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator (with magneto- or dynamo-electric generators F02P1/00; piezoelectric ignition F02P3/12; with continuous electric spark F02P15/10) - H01T 13/06: Covers forming a part of the plug and protecting it against adverse environment - H01T 13/08: Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber - H01T 13/44: with transformers, e.g. for high-frequency ignition - F02P 3/02: having inductive energy storage, e.g. arrangements of induction coils {(ignition coils structurally combined with sparking plugs F02P13/00; constructional details of ignition coils H01F38/12)} - F02P 9/007: {by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition} - F02P 15/001: {Ignition installations adapted to specific engine types (ignition of jet propulsion plants F02K9/95; for rotary piston engines F02B53/12)} - H01F 38/12: Ignition, e.g. for IC engines - H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H) - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract By grounding a metal first housing, radiation noise generated from the coupling circuit is shielded. Further, by enclosing the first housing in a metal second housing in a manner such that the first housing and the second housing do not come into contact with each other, and grounding the second housing by connecting the second housing to an engine block, radiation noise generated by the capacitive component between the coupling circuit and the first housing is shielded by the second housing. As a result, the influence of this noise on peripheral devices of the high frequency discharge ignition device can be suppressed. ## Claims ### Claim 1 A high frequency discharge ignition device in which high frequency energy supplied from a high frequency energy supply circuit is coupled to a high voltage pulse supplied from an ignition coil and supplied to a spark plug connected to an engine block, the high frequency discharge ignition device comprising: an output device that includes a coupling circuit supplying the coupled energy to the spark plug; a first housing in which the output device is housed; and a second housing that is connected to the engine block, the second housing and the engine block being formed separately from each other, wherein the output device is directly attached to the spark plug, the first housing and the second housing are respectively formed from metal, the first housing is grounded, the first housing is enclosed in the second housing, and the first housing is separated from the second housing by a gap such that the first housing is not in electrical contact with the second housing in a portion other than through the engine block. ### Claim 2 (depends on 1) The high frequency discharge ignition device according to claim 1, wherein the first housing is grounded by being electrically connected to the spark plug or the engine block. ### Claim 3 (depends on 1) The high frequency discharge ignition device according to claim 1, wherein the coupling circuit is resin-molded inside a resin inner housing, and the inner housing is housed in the first housing. ### Claim 4 (depends on 2) The high frequency discharge ignition device according to claim 2, wherein the coupling circuit is resin-molded inside a resin inner housing, and the inner housing is housed in the first housing. ### Claim 5 (depends on 1) The high frequency discharge ignition device according to claim 1, wherein the second housing includes a main body portion and a cover portion, and the high frequency energy supply circuit is built into the cover portion. ### Claim 6 (depends on 2) The high frequency discharge ignition device according to claim 2, wherein the second housing includes a main body portion and a cover portion, and the high frequency energy supply circuit is built into the cover portion. ### Claim 7 (depends on 3) The high frequency discharge ignition device according to claim 3, wherein the second housing includes a main body portion and a cover portion, and the high frequency energy supply circuit is built into the cover portion. ### Claim 8 (depends on 4) The high frequency discharge ignition device according to claim 4, wherein the second housing includes a main body portion and a cover portion, and the high frequency energy supply circuit is built into the cover portion. ### Claim 9 (depends on 5) The high frequency discharge ignition device according to claim 5, wherein the cover portion is fixed to the main body portion. ### Claim 10 (depends on 6) The high frequency discharge ignition device according to claim 6, wherein the cover portion is fixed to the main body portion. ### Claim 11 (depends on 7) The high frequency discharge ignition device according to claim 7, wherein the cover portion is fixed to the main body portion. ### Claim 12 (depends on 8) The high frequency discharge ignition device according to claim 8, wherein the cover portion is fixed to the main body portion. ### Claim 13 (depends on 1) The high frequency discharge ignition device according to claim 1, wherein a ventilation hole is provided in the second housing. ### Claim 14 (depends on 2) The high frequency discharge ignition device according to claim 2, wherein a ventilation hole is provided in the second housing. ### Claim 15 (depends on 3) The high frequency discharge ignition device according to claim 3, wherein a ventilation hole is provided in the second housing. ### Claim 16 (depends on 4) The high frequency discharge ignition device according to claim 4, wherein a ventilation hole is provided in the second housing. ### Claim 17 (depends on 5) The high frequency discharge ignition device according to claim 5, wherein a ventilation hole is provided in the second housing. ### Claim 18 (depends on 6) The high frequency discharge ignition device according to claim 6, wherein a ventilation hole is provided in the second housing. ### Claim 19 (depends on 7) The high frequency discharge ignition device according to claim 7, wherein a ventilation hole is provided in the second housing. ### Claim 20 (depends on 12) The high frequency discharge ignition device according to claim 12, wherein a ventilation hole is provided in the second housing.