EP 1133212 A3 20060111 - Acoustic device
Title (en)
Acoustic device
Title (de)
Akustisches Gerät
Title (fr)
Dispositif acoustiqué
Publication
Application
Priority
- EP 98907080 A 19980227
- GB 9704486 A 19970304
Abstract (en)
[origin: WO9839947A1] Acoustic devices have members extending transversely of thickness and capable of sustaining bending waves causing consequential acoustic action by reason of areal distribution of resonant modes of natural bending wave vibration consonant with required achievable acoustic action of said member over a desired operative acoustic frequency range. Areal distribution of stiffness including variation(s) therein is used to get desired locations for bending wave transducers and/or good resonant mode acoustic action from inherently unfavourable shapes of members. Members with combined pistonic action drive and bending wave excitement at centres of mass and geometry are featured.
IPC 8 full level
CPC (source: EP KR)
H04R 7/045 (2013.01 - EP); H04R 7/10 (2013.01 - EP KR); H04R 2440/07 (2013.01 - EP)
Citation (search report)
- [Y] WO 9203024 A1 19920220 - SECR DEFENCE BRIT [GB]
- [A] GB 2074812 A 19811104 - MATSUSHITA ELECTRIC IND CO LTD
- [A] FR 2441981 A1 19800613 - SONY CORP [JP]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 14, no. 112 (E - 0897) 28 February 1990 (1990-02-28)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE
DOCDB simple family (publication)
WO 9839947 A1 19980911; AR 011920 A1 20000913; AT E231677 T1 20030215; AU 6305398 A 19980922; AU 735051 B2 20010628; BG 103669 A 20000331; BR 9808169 A 20000516; CA 2283381 A1 19980911; CN 1157999 C 20040714; CN 1249892 A 20000405; CZ 310299 A3 19991215; DE 69810905 D1 20030227; DE 69810905 T2 20031224; EA 002480 B1 20020627; EA 199900793 A1 20000424; EE 9900386 A 20000417; EP 0965245 A1 19991222; EP 0965245 B1 20030122; EP 1133212 A2 20010912; EP 1133212 A3 20060111; ES 2191925 T3 20030916; GB 9704486 D0 19970423; GE P20022748 B 20020725; HK 1022398 A1 20000804; HU P0002652 A2 20001228; HU P0002652 A3 20011128; ID 20143 A 19981008; IL 131485 A0 20010128; JP 2001513967 A 20010904; KR 20000075889 A 20001226; NO 994288 D0 19990903; NO 994288 L 19990903; NZ 336943 A 20010223; PL 335366 A1 20000425; SK 119499 A3 20000814; TR 199902177 T2 20000121; TW 462199 B 20011101; YU 39599 A 20011226; ZA 981662 B 19980903
DOCDB simple family (application)
GB 9800621 W 19980227; AR P980100939 A 19980303; AT 98907080 T 19980227; AU 6305398 A 19980227; BG 10366999 A 19990818; BR 9808169 A 19980227; CA 2283381 A 19980227; CN 98803056 A 19980227; CZ 310299 A 19980227; DE 69810905 T 19980227; EA 199900793 A 19980227; EE P9900386 A 19980227; EP 01202058 A 19980227; EP 98907080 A 19980227; ES 98907080 T 19980227; GB 9704486 A 19970304; GE AP1998005011 A 19980227; HK 00101212 A 20000228; HU P0002652 A 19980227; ID 980309 A 19980302; IL 13148598 A 19980227; JP 53826298 A 19980227; KR 19997007968 A 19990902; NO 994288 A 19990903; NZ 33694398 A 19980227; PL 33536698 A 19980227; SK 119499 A 19980227; TR 9902177 T 19980227; TW 87103082 A 19980303; YU 39599 A 19980227; ZA 981662 A 19980227