Planar type electro-acoustic transducer and process for manufacturing same
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorsAkira Nakamura, Takao Nakaya
Life of this patent
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Abstract
A planar type electro-acoustic transducer having a disk-like inner diaphragm member to the top end inner side of a voice coil bobbin, and having an annular outer diaphragm member concentric with said inner diaphragm member and conjugated to the top end outer side of the voice coil bobbin, in such way that these two diaphragm members jointly constitute a single planar type diaphragm. This arrangement increases the conjugation strength of the diaphragm members to the voice coil bobbin and also enables a new manufacturing process for the transducer in which the diaphragm and the coil bobbin are easily centered.
Claims10
An electro-acoustic transducer, comprising:
- a vibration system assembly including:
- a planar type diaphragm concentrically divided into an inner diaphragm member and a ring-like outer diaphragm member;
- and
- a voice coil bobbin having said inner diaphragm member bonded to an inner side thereof by a bonding agent and having said outer diaphragm member bonded to an outer side thereof by a bonding agent and having a voice coil attached therearound;
- said inner diaphragm member having its outer diameter substantially equal to the inner diameter of said voice coil bobbin, and said outer diaphragm member having its inner diameter substantially equal to the outer diameter of said voice coil bobbin;
- and
- a magnetic circuit assembly including:
- a frame for vibratably supporting said vibration system assembly;
- a magnetic gap for receiving the voice coil;
- and a
- magnet for providing a magnetic field to said magnetic gap;
- an edge member for vibratably supporting said outer member;
- and a damper for vibratably supporting said voice coil bobbin, said edge member and said damper each having an end fixed relative to said frame.
A diaphragm assembly for electro-acoustic transducer, comprising:
- a planar honeycomb type diaphragm comprised of an inner substantially circular diaphragm portion and a separate outer annular diaphragm portion;
- a tubular voice coil bobbin having a first end thereof secured to the diaphragm, wherein the inner diaphragm portion is bonded to the inside of the bobbin and the outer diaphragm portion is bonded to the outside of the bobbin;
- and
- a voice coil secured to the bobbin near and second end thereof.
In an electro-acoustic transducer of the type having a planar honeycomb-type diaphragm secured to a tubular voice coil bobbin, the improvement wherein the diaphragm includes an inner honeycomb portion which is bonded to and extends into the inside of an end of the bobbin and a separate annular outer honeycomb portion, the inside surface of which is bonded to the outside of the bobbin.
Dependencies are inferred from the claim text.