An approaching vehicle warning speaker device includes a diaphragm that generates sound, an edge section joined to an outer edge of the diaphragm, and a frame supporting an outer periphery of the edge section. The diaphragm is made of a film containing polyimide. The edge section includes a base member made of fiber and rubber-containing waterproof layers provided on both sides of the base member.
APPROACHING VEHICLE WARNING SPEAKER DEVICE
2017-04-20
Patent
Electronic Resource
English
IPC: | H04R LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS , Lautsprecher, Mikrofone, Schallplatten-Tonabnehmer oder ähnliche akustische, elektromechanische Wandler / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein |
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European Patent Office | 2021
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