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2、。。 'F:' Ffa ,, ..., '' '' ',' ν inventing name 'speaker, address Tokyo, Chiyoda-ku, Marunouchi5th No. 1 Co., Ltd. 1 "" I (I made fl. ■ Japan patent Government office 0 特 開 昭 51-113727 ■
Patent application to to well to, tr 6 ψ 6! 0 Japan Class @ Int, CI 2 ° / 192/7 j j / Hot 7-R 710
65 0038 r + 鷺 1 名称 Name of the invention A part made of a good conductor with a cylindrical
part in the lower part of the speaker and a spherical part or near it in the upper part The speaker
which is characterized by fitting to a center ball.
2, the scope of claims
3. Detailed description of the invention The present invention relates to an electrodynamic
speaker, but a short circuited around a magnetic circuit center ball until a distortion is reduced
and an input impedance is flattened as a component of a conventional speaker. Two parts of a
nearly hemispherical equalizer placed on a canter ball for flattening of the output sound pressure
frequency characteristics valleys resulting from the disturbance of the wave front caused by the
ring being a ring and the diaphragm shape not being a handboard was there. Each of these has
the disadvantage of having a large number of parts carpenters, each of which is made separately
and fixed to a magnetic circuit. An object of the present invention is to provide an equalizer and a
short ring integrally, which are cheaper than conventional speakers. Embodiments of the present
invention will be described in detail with reference to the drawings. The figure shows a cross
section of the main part of the inventive speaker. 1 is a magnet, 2 is a center ball, and the bottom
is a yoke. A plate 3 is a yoke of the magnetic circuit. 4 is an equalizer and 5 is a magnetic air gap.
The upper part of the equalizer 4 is substantially hemispherical, and the lower part is cylindrical.
The material is copper. It is made of good conductor such as aluminum and brass. The
manufacturing method is formed from the above-mentioned metal plate by drawing or the like.
The position where the equalizer 4 is placed is such that the cylindrical portion fits with the
center ball 2 and covers the side surface of the center ball at the magnetic gap portion. The bond
with the center ball 2 is firmly bonded to the center ball by bonding or press-fitting. As described
above, according to the present invention, the action as the action ring as the short ring is
sufficient, and since the conventional one composed of two parts is made into 1 EndPage: 1 part,
the part price can be reduced. Further, the conventional equalizer can be fixed to the center pole
by screwing, or the bonding operation can be omitted, and the number of man-hours can be
reduced. As a result, an inexpensive speaker can be provided.
4 is a cross-sectional view of the main part of the speaker of the present invention. Explanation
of symbols 1: Magnet 2: Center ball 3 nibrates 4: Equalizer 5: magnetic gap agent patent attorney
thin 1) Inventory of items such as an index member (1) Details, IJ 1 sheet (2) screen, 1
Communication (3) Commission r [Like 1 (4) Bamboo correction request copy 1 copy □-only
one--怜 EndPage: 2
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description, jps51113727
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