H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/78
H04R 7/02 (2006.01) H04R 1/22 (2006.01) H04R 9/06 (2006.01)
Patent
CA 1203014
ABSTRACT OF THE DISCLOSURE A dynamic type headphone in which a diaphragm having a bobbin for a voice coil located within a magnetic circuit is formed of one sheet made of polyethylene terephthalate resinous material is disclosed, in which if a diameter of a vibrating portion of the sheet is taken as .PHI. and a thickness thereof is taken as t, its ratio Image is selected in a range of 4 x 10-4 to 5 x 10-4.
413722
Kakiuchi Tsutomu
Kamon Yoshiyuki
Gowling Lafleur Henderson Llp
Sony Corporation
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