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Stationary Lamp Illumination for Use With Translating Mirror Scan System

IP.com Disclosure Number: IPCOM000078831D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Ralston, JC: AUTHOR

Abstract

In any electrophotographic system where the imaging is done by light reflected from the original document, it is desirable to utilize the available light as efficiently as possible. In a translating mirror scan system where a scanning mirror moves parallel to the document, probably the most efficient illumination system is a tungsten-halogen lamp at the focus of an elliptical reflector mounted on top of the scanning mirror. In such a system the lamp moves with the mirror scanning the document. Considerable heat is generated by the lamp. Without a fairly complicated cooling system, the document plane becomes quite warm in a multiple copy mode. For long copy runs the temperature may reach a level where the document becomes scorched. Another detrimental effect is mechanical vibration on lamp life.

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Stationary Lamp Illumination for Use With Translating Mirror Scan System

In any electrophotographic system where the imaging is done by light reflected from the original document, it is desirable to utilize the available light as efficiently as possible. In a translating mirror scan system where a scanning mirror moves parallel to the document, probably the most efficient illumination system is a tungsten-halogen lamp at the focus of an elliptical reflector mounted on top of the scanning mirror. In such a system the lamp moves with the mirror scanning the document. Considerable heat is generated by the lamp. Without a fairly complicated cooling system, the document plane becomes quite warm in a multiple copy mode. For long copy runs the temperature may reach a level where the document becomes scorched. Another detrimental effect is mechanical vibration on lamp life.

The structures described allow the lamp to be held stationary at a distance from the document plane. Simpler, adequate cooling can be employed, and the available light is utilized quite efficiently. A lamp 1, (or lamps) with a linear filament, is placed at the focus of a cylindrical parabolic reflector 2 so that the greater portion of the light emitted from the lamp is reflected from the cylindrical parabolic reflector, in a direction parallel to a line from the vertex to the focus of the parabola. The light is directed onto a second cylindrical parabolic reflector 3, the focus of which is located in...