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US 4,050,066 AGranted
Buzzer
AssigneeSeikosha Co., Ltd.
InventorsTakeshi Yanagisawa, Motoyuki Osuga
Life of this patent
Estimating the term…
Abstract
A buzzer comprises an annular magnet, a coil disposed at the inside of the magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil and with its one end facing said vibration plate, a case and a yoke. Said magnet said vibration plate and said yoke are held by the magnetic attraction of the magnet.
Claims4
A buzzer comprising;
- an annular magnet, a coil disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet.
A buzzer comprising;
- an annular magnet, a coil wound about a bobbin disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, a yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet, and said magnet being provided with step portion for holding peripheral portion of a flange of said bobbin.
Dependencies are inferred from the claim text.