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HIGH EFFICIENCY PLATEN FOR STREAM FEED SCANNER

IP.com Disclosure Number: IPCOM000024624D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 61K

Publishing Venue

Xerox Disclosure Journal

Abstract

The radiometric efficiency of a CCD Scanner with a fluorescent lamp is very poor due to the difficulty encountered in focusing the broad but relatively low radiance of the fluorescent source. Mirrors have been used to increase the efficiency, but the gain is not very high. The problem of using a mirror (or mirrors) is that the mirror cannot be placed at the most efficient position due to vignetting.

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XEROX DISCLOSURE JOURNAL

HIGH EFFICIENCY PLATEN FOR

STREAM FEED SCANNER Philip L. Chen

PLATEN, F

I

Proposed Classification
U.S. Cl. 350/171 Int. CI. G02b 27/14

The radiometric efficiency of a CCD Scanner with a fluorescent lamp is very poor due to the difficulty encountered in focusing the broad but relatively low radiance of the fluorescent source.

Mirrors have been used to increase the efficiency, but the gain is not very high. The problem of using a mirror (or mirrors) is that the mirror cannot be placed at the most efficient position due to vignetting.

This disclosure suggests making the platen glass of a stream feed scanner into a trapezoid of cross-section ABCD so that surfaces AB and DC become internal reflection surfaces. Point E will be reflected by surface AB and fall on Point

0, and Point F will be reflected by surface DC and fall on Point 0. Point 0, E.

Volume 6 Number 3 May/June 1981 127

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HIGH EFFICIENCY PLATEN FOR STREAM FEED SCANNER (Cont'd)

and F are all within the peak illumination region of the aperture lamp and the reflectivity of internal reflection is nearly 100%. It is possible that the irradiance gain at Point o can approach as high as 3.0 with two flat reflective surfaces.

The two reflective surfaces need not be flat, they can be curved to improve the efficiency further. The underside BC may also be made curved so that it has cylindrical power. This may give an additional i...