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:
Apr. 23, 2002
Filed:
Aug. 08, 2000
Nobuaki Yokoyama, Tokyo, JP;
General Research of Electronics, Inc., Tokyo, JP;
Abstract
A power supply unit which has charging function enables error charging of a non-charged-type battery to be prevented, which battery is used as a power supply of an electric circuit device. Such the power supply unit is materialized with simple constitution and a low price. The power supply unit in the electric circuit device includes an external power supply connecting power supply jack, a protection circuit, and so forth. A charged-type battery case is provided with a positive electrode terminal of the power supply unit, a positive terminal corresponding to a first and a second negative electrode terminals, and a first and a second negative terminals. While a non-charged-type battery case is only provided with a positive terminal and a first negative terminal. A terminal corresponding to the second terminal is not provided for the non-charged-type battery case. Consequently, when the charged-type battery is employed, the charged-type battery is charged on the occasion of connection of the external battery, while the non-charged-type battery is not charged as the non-charged-type battery is employed, it is capable of preventing failure charging of the non-charged-type battery.