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:
Mar. 13, 2012
Filed:
Nov. 01, 2007
Masaki Otsuki, Yokohama, JP;
Satoshi Ejima, Tokyo, JP;
Masaki Otsuki, Yokohama, JP;
Satoshi Ejima, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A head band unit contains a bending sensor which detects bending of the head band unit. As shown in the figure, the bending degree of the head band unit when mounted on a user head is smaller than the bending degree of the head band unit when not mounted. Accordingly, the bending degree of the bending sensor is also smaller when mounted. Consequently, by using the output of the bending sensor, it is possible to judge whether the headphone is mounted on the user head. When the headphone is mounted on the user head, power supply to a secondary battery is stopped. Thus, it is possible to provide an output device which can safely charge the secondary battery and can continue operation by an external power source even if the electric capacity of the secondary battery has become zero.