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    • 7. 发明专利
    • Improvements in or relating to sound amplifiers
    • GB291862A
    • 1928-06-08
    • GB646727
    • 1927-03-08
    • HERMANN FISCHER
    • H04R1/22
    • 291,862. Fischer, H. March 8, 1927. Loud-speakers; magnetic instruments; diaphragms.-The large diaphragm or resonator 9 of a sound amplifier or loud-speaker is carried exterior to its centre by a ring or webs projecting from the magnetic diaphragm 3. Fig. 1 shows a loud-speaker construction in which the upper end of a standard A is formed as a chamber 1 which receives the magnets 2 and has the diaphragm 3 clamped against a shoulder 4 by a ring 5. A plurality of spaced webs 6 connect the diaphragm 3 to a conical head 7 secured to the apex of the resonator 9 by cap 10 and nut 11. The webs 6, which may be made separate from the head 7 and diaphragm 3 or formed integrally with either of these members, are preferably covered with sound absorbing material 12. Fig. 4 shows a modified construction in which a plurality of webs 19 are employed having their tops bent angularly as at 19x for connection to the resonator 20 or their bases formed with feet as at 21 for connection with the diaphragm 22. In a further modification, Fig. 2, the connecting member is in the form of a ring 12 having transversely extending tongues 13, 14 for connection to the resonator and diaphragm respectively, whilst in the construction shown in Fig. 7 a connecting member of truncated conical form is employed.