Browse Prior Art Database

LENTICULAR SCREEN FOR REPRODUCING CONTINUOUS TONE

IP.com Disclosure Number: IPCOM000023955D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 298K

Publishing Venue

Xerox Disclosure Journal

Abstract

Line screening enables continuous tone images to be reproduced in a half-tone effect. When reproducing microfilm, it is necessary that the line screen be placed in the magnified image plane adjacent a reproduction medium since a fine enough

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 71% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

LENTICULAR SCREEN FOR REPRODUCING CONTINUOUS TONE
Melvin E. Swanberg

/8

~7 -20

~22

Proposed Classification

U.S. Ci. 96/45 Int. CL G03f 5/00

Line screening enables continuous tone images to be reproduced in a half~tone effect. When reproducing microfilm, it is necessary that the line screen be placed in the magnified image plane adjacent a reproduction medium since a fine enough

line screen cannot be readily obtained for use in the object plane.

Placing the line screen at the image plane causes the following problems: (a) the image is focused on the recording medium, not on the line screen; (b) the closeness

of the line screen to the recording medium may cause contamination of the line screen by the developer utilized to develop the images formed on the recording medium; and (c) the line screen blocks about 50% of the image light which reduces

image contrast.

To overcome these problems, a lenticular screen 10 comprising a plurality of lens elements 12, 14, .. is positioned adjacent recording medium 16, which may be a xerographic drum, to redistribute the image light in a line pattern. In order to increase the focal length of the lenticular screen 10, the screen is formed in transparent material 18, which has a slightly lower index of refraction than the lens

material, The increased focal length allows the lenticular screen 10 to be placed its own focal distance from recording medium 16.

/

/0

Volume 4 Number 3 May/lune 1979 295

[This page co...