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BRIEF DESCRIPTION OF THE DRAWINGS The attached drawing is a longitudinal front view of the
present converter. In the figure, 1 indicates a housing, 2 indicates a core, 3 indicates a vibrating
film, 4 and 5 indicate magnetic legs, and 6 indicates an excitation coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
transducer which converts all electrical signals into acoustics. In the drawings, reference numeral
1 denotes a housing, which is housed in a core 2 inside and a diaphragm 3 stretched in an
opening. A magnetic leg 4 protruding toward the center of the vibrating film 3 is provided at the
central portion Kh of the core 2, and a magnetic leg 5 projecting toward the magnetic leg 4 is
provided at the center of the peristaltic film 3. It is installed opposite. In the upper cocoa, the
magnetic legs 4 above all centers the excitation core (1), 5 knees, 1 (# 6 # 4! * 1 p 1: WA, et 7) °
(# 6 P, etc.)-The magnetic flux generated is a bump i * t. One or both of the four-character-in-one
magnetic pole 4 and 5 may be made of a magnet, and a suction force acts on the magnetic legs
between the magnetic legs, so that vibration can be made as it is. Also, the smaller the gap
between the magnetic legs 4 and 5 is, the smaller the reluctance is, so it goes without saying that
the sensitivity is improved, and in some cases, the magnetic legs mutually interact due to the
vibration of the vibrating film 3! ! The gap may be made small enough to touch. Furthermore,
when the converter according to the present invention is used as a buzzer, the output of the
oscillator is added, or an appropriate number of coils 6 are divided to form a correct feedback
circuit, so that automatic oscillation is performed. It is As described above, the converter
according to the present invention is provided with magnetic legs 4 and 5 facing each other
between the central portion of the core 2 and the central portion of the vibrating membrane 3 to
reduce magnetic resistance and at the central portion of the vibrating membrane 3 Since it is
configured to act magnetically effectively, there is an effect that the conversion efficiency can be
totally improved as compared with the conventional product, and hence it is practically used as a
seed type converter whose demand will increase in the future from the board (2). It is useful.
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