Browse Prior Art Database

LOW NOISE MICROWAVE DRYING

IP.com Disclosure Number: IPCOM000026391D
Original Publication Date: 1991-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 68K

Publishing Venue

Xerox Disclosure Journal

Abstract

A low noise power supply circuit of a microwave generator used in drying liquid ink jet prints is disclosed. A conventional microwave generator circuit shown in Figure 1, uses a center-tapped full-wave rectifier circuit 1 to power a magnetron 2. This circuit produces excess noise at an AC wave form generated at 6OHz and 120Hz. The noise produced at such modulations interferes with the microwave source heat generation uniformity. This interference may result in non-uniform drying of ink jet printed sheets, particularly at high process speeds through a microwave drying region.

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XEROX DISCLOSURE JOURNAL

LOW NOISE MICROWAVE DRYING

Proposed Richard H. Tuhro U.S. C1.346/075 Classification

Int. C1. Gold 15/18

DFIG. 2

c

I 7 3 3

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 5 SeptembedOctober 1991 301

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LOW NOISE MICROWAVE DRYING(Cont'd)

A low noise power supply circuit of a microwave generator used in drying liquid ink jet prints is disclosed.

A conventional microwave generator circuit shown in Figure 1, uses a center- tapped full-wave rectifier circuit 1 to power a magnetron 2. This circuit produces excess noise at an AC wave form generated at 6OHz and 120Hz. The noise produced at such modulations interferes with the microwave source heat generation uniformity. This interference may result in non-uniform drying of ink jet printed sheets, particularly at high process speeds through a microwave drying region.

A low noise power supply circuit, as shown in Figure 2, utilizes a ferroresonant transformer combined with a tuning capacitor 3 in a variation of a center- tapped full-wave rectifier circuit 1 to power a magnetron 2.

The circuit reduces the ripple voltage at 6OHz and 120Hz thus increasing the magnetron's ability to create uniform microwaves. The reduction in noise enhances the uniformity of drying characteristics in ink jet created documents.

302 XEROX DISCLOSURE JOURNAL - Vol. 16, No. 5 September/October 1991

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