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. 15, 1994
Filed:
Jan. 27, 1993
Sony Corporation, , JP;
Abstract
A DC power supply device for use with a video tape recorder with a built-in camera has a plurality of power supply blocks for supplying a plurality of voltages, each of the power supply blocks being composed of a switching circuit for being supplied with a DC voltage and a smoothing circuit connected to an output terminal of the switching circuit. The power supply blocks are mounted on a multilayer circuit board which includes a layer of a ground pattern with an electric conductor extending substantially fully thereover, the ground pattern being separated into a plurality of ground pattern portions by a plurality of recesses defined therein, the power supply blocks having respective ground terminals connected to the ground pattern portions, respectively. The multilayer circuit board may comprise at least a layer for mounting electronic parts thereon, a layer having a signal line pattern thereon, a layer having a power supply line pattern thereon, in addition to the layer of the ground pattern, and a plurality of insulating layers electrically separating and mechanically joining the layers.