Title:
TELEPHONE HANDSET
Document Type and Number:
Japanese Patent JPH04322543
Kind Code:
A
Abstract:
PURPOSE: To realize a broad band telephone set by mounting an elastic cover whose frequency characteristic is freely improved to a contact face of a mouse piece with respect to an ear shell.
CONSTITUTION: When an elastic cover NO is covered to an ear shell contact part 9 of a mouse piece 8, almost the same sensitivity as 1kHz is obtained even at 100Hz to improve the low frequency characteristic. Moreover, a sound absorption member 6 is filled in a transmitter unit 3 and an expiration flow attenuation screen 2 is provided to the unit 3. Thus, a broad band telephone set is realized and sound quality deterioration due to puff noise is prevented.
Inventors:
IRII HIROSHI
OGAWA MINEYOSHI
OGAWA MINEYOSHI
Application Number:
JP9057391A
Publication Date:
November 12, 1992
Filing Date:
April 22, 1991
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04M1/03; (IPC1-7): H04M1/03
Attorney, Agent or Firm:
Takahiko Suga