The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2020
Filed:
Jan. 16, 2020
Applicant:
Hamanakodenso Co., Ltd., Kosai, Shizuoka-pref., JP;
Inventors:
Tatsuya Kawai, Kosai, JP;
Yuuya Maebashi, Kosai, JP;
Assignee:
HAMANAKODENSO CO., LTD., Shizuoka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 1/30 (2006.01); G08B 3/10 (2006.01); H04R 7/16 (2006.01); H04R 9/02 (2006.01); H04R 7/12 (2006.01); H04R 9/06 (2006.01);
U.S. Cl.
CPC ...
H04R 1/30 (2013.01); G08B 3/10 (2013.01); H04R 7/12 (2013.01); H04R 7/16 (2013.01); H04R 9/025 (2013.01); H04R 9/06 (2013.01);
Abstract
An alarm sound generating apparatus includes a spiral pipe extending from a sound wave inlet to a sound wave outlet, and a cover including a reflecting wall configured to reflect a sound wave released from the sound wave outlet. The reflecting wall is distanced from and faces to the sound wave outlet. A distance between the sound wave outlet and the reflecting wall falls within ±10% of an odd multiple of one-fourth of a wavelength calculated from a fundamental frequency of the alarm sound or a multiple harmonic thereof.