# US 9,519,271 B2 · Acoustic radiating membrane arrangement for a striking watch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,271 B2 - Document ID: US9519271B2 - Status: Granted - Kind: B2 - Application number: 14/879,288 - Filed: 2015-10-09 - Published: 2016-04-21 - Granted: 2016-12-13 - Earliest claimed: 2014-10-15 - Assignees: Montres Breguet S.A. - Applicants: Montres Breguet S.A. - Inventors: Polychronis Nakis Karapatis; Davide Sarchi; Younes Kadmiri - Web page: https://patentgrep.com/patent/US9519271B2 ## CPC - G04B 37/0075: {with means to enhance sound transmission (sonorous means for chimes G04B21/08; for alarm clocks G04B23/028; clockworks combined with musical devices G04B47/025)} - G04B 21/00: Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; {indicating the time by means other than acoustically, or by combined means G04B25/00; indicating the time by visual means G04B19/00, G04C17/00; acoustic signalling arrangements G08B3/00}) - G04B 21/08: Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, {G04B23/08; sounding arrangements in alarm clocks G04B23/028; cases with arrangements for enhancing sound production G04B37/0075; carillons and sounding boards G10F1/08, G04B1/10, G10D13/08}) - G10K 1/10: Sounding members; Mounting thereof; Clappers or other strikers - G10K 13/00: Cones, diaphragms, or the like, for emitting or receiving sound in general (for electromechanical transducers H04R7/00) - G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## Abstract There is provided an acoustic radiating membrane arrangement for a striking or musical watch. The arrangement includes a first membrane arranged superposed on a second membrane. Peripheral edge portions of the two membranes are intended to hold the membranes inside a watch case. The first acoustic radiating membrane is configured to radiate efficiently the frequencies in a first frequency band. The second acoustic radiating membrane is configured to radiate efficiently the frequencies in a second frequency band that is different from the first frequency band. A spacer ring is also disposed between the peripheral edge portions of the first membrane and of the second membrane to define an acoustic cavity. ## Claims ### Claim 1 An acoustic radiating membrane arrangement for a striking or musical watch, the arrangement including a first membrane arranged superposed on a second membrane, a first peripheral edge portion of the first membrane and a second peripheral edge portion of the second membrane being intended to hold the membranes inside a watch case, the first acoustic radiating membrane being configured to radiate efficiently the frequencies in a first frequency band, and the second acoustic radiating membrane being configured to radiate efficiently the frequencies in a second frequency band that is different from the first frequency band, wherein a spacer ring is disposed between the first membrane and the second membrane to define a cavity between the two membranes, which is tuned to at least one of the two natural vibration frequencies of the two membranes. ### Claim 2 (depends on 1) The acoustic radiating membrane arrangement according to claim 1, wherein the first membrane is configured to radiate efficiently in a frequency band between 2 kHz and 4 kHz, and wherein the second membrane is configured to radiate efficiently in a frequency band between 1 kHz and 2 kHz. ### Claim 3 (depends on 1) The acoustic radiating membrane arrangement according to claim 1, wherein the first membrane is configured in the form of a dome with a central portion connected to a lateral wall, which is connected to the first peripheral edge portion. ### Claim 4 (depends on 3) The acoustic radiating membrane arrangement according to claim 3, wherein the lateral wall is of cylindrical shape. ### Claim 5 (depends on 4) The acoustic radiating membrane arrangement according to claim 4, wherein the central portion includes a base defining a bottom, and an annular portion at the periphery of the base so as to form a single piece. ### Claim 6 (depends on 5) The acoustic radiating membrane arrangement according to claim 5, wherein the base is of circular flat shape, and wherein the annular portion is conic. ### Claim 7 (depends on 3) The acoustic radiating membrane arrangement according to claim 3, wherein the central portion includes at least a first hollow area in the form of an ellipse. ### Claim 8 (depends on 7) The acoustic radiating membrane arrangement according to claim 7, wherein the central portion includes two elliptical hollow areas, which are of different thickness. ### Claim 9 (depends on 1) The acoustic radiating membrane arrangement according to claim 1, wherein the second membrane is configured in the form of a dome with a central portion connected to a lateral wall, which is connected to the second peripheral edge portion. ### Claim 10 (depends on 9) The acoustic radiating membrane arrangement according to claim 9, wherein the lateral wall is of cylindrical shape. ### Claim 11 (depends on 9) The acoustic radiating membrane arrangement according to claim 9, wherein the central portion includes a base defining a bottom, and an annular portion at the periphery of the base so as to form a single piece. ### Claim 12 (depends on 11) The acoustic radiating membrane arrangement according to claim 11, wherein the base is of circular flat shape, and wherein the annular portion is conic. ### Claim 13 (depends on 9) The acoustic radiating membrane arrangement according to claim 9, wherein the base of the second membrane includes one or more pierced portions or openings. ### Claim 14 (depends on 13) The acoustic radiating membrane arrangement according to claim 13, wherein the pierced portions or openings define suspended sectors, which are U-shaped, and whose arms are oriented towards the centre of the base. ### Claim 15 (depends on 13) The acoustic radiating membrane arrangement according to claim 13, wherein the base of the second membrane is connected to an annular portion of the central portion by means of connecting sectors, and wherein the connecting sectors are made in the material of the base with a thickness reduced by a factor of at least two compared to the central portion of the base. ### Claim 16 (depends on 15) The acoustic radiating membrane arrangement according to claim 15, wherein the central portion includes four connecting sectors, which are regularly spaced from each other, with one pierced portion between two successive sectors. ### Claim 17 (depends on 1) The acoustic radiating membrane arrangement according to claim 1, wherein at least one of the two membranes is transparent.