Browse Prior Art Database

Fiber Optic Lamp

IP.com Disclosure Number: IPCOM000052924D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Lawson, FM: AUTHOR [+2]

Abstract

It is from time to time desirable to provide enhanced illumination at or near the writing line of a typewriter. One technique for accomplishing such enhanced illumination is the provision of a light pipe positioned on an axis parallel to the platen 12. The light pipe is provided with illumination from light-emitting members 14 positioned at the end of the light pipe. In order to effect illumination of the writing line region, it is necessary to cause the light rays emitting from light-emitting members 14 to exit the confines of the light pipe 10 and thereby impinge upon the writing page.

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 77% of the total text.

Page 1 of 2

Fiber Optic Lamp

It is from time to time desirable to provide enhanced illumination at or near the writing line of a typewriter. One technique for accomplishing such enhanced illumination is the provision of a light pipe positioned on an axis parallel to the platen 12. The light pipe is provided with illumination from light-emitting members 14 positioned at the end of the light pipe. In order to effect illumination of the writing line region, it is necessary to cause the light rays emitting from light- emitting members 14 to exit the confines of the light pipe 10 and thereby impinge upon the writing page.

This may be accomplished, as seen in Figs. 2 and 3, by forming into the periphery of the light pipe notches of increasing dimension with increased displacement along the axis of the light pipe from the light emitting member 14. As light travels through the light pipe, it will exit through any face which is perpendicular to the general path of light, but will be reflected by those surfaces which are positioned at an angle to the path of the light rays. Thus, the slanted surfaces of notches 16 will act as reflecting mirrors and divert the light from the pipe. The light which has been deflected onto the page by the small notches will, in substantial quantity, not be passed to the succeeding notches, thus requiring additional depth on each succeeding notch to intercept additional light rays.

This device can also be utilized, by mounting feed rolls on the light pipe,...