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Ambient Light Indicator Disclosure Number: IPCOM000053458D
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-12

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Related People

Williams, SS [+details]


On typewriters with clear margin scale windows, a carrier position indicator may be formed of an optical fiber or light pipe and attached to the carrier of the typewriter. The light pipe 10 will have one end 12 positioned close to the margin window 14. The upper or light gathering end 16 should be exposed to a region of ambient light such that the light collected by it will be transmitted to the margin scale end, thereby giving the effect of a small pin point of light behind the margin scale. This point will then move as the carrier 18 of the typewriter translates.