Browse Prior Art Database

Dispersion Image Formation With Improved Light Throughput

IP.com Disclosure Number: IPCOM000095858D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Lohmann, AW: AUTHOR

Abstract

This is a spectrometric image transmission system for transmitting the information on record 20 to screen 21. The system includes point light source 1, narrow slot 2, lens 3, spectroprism 4, lens 5, light collecting and transmitting device 6, second narrow slot 7, lens 8, second spectroprism 9 and lens 10.

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Dispersion Image Formation With Improved Light Throughput

This is a spectrometric image transmission system for transmitting the information on record 20 to screen 21. The system includes point light source 1, narrow slot 2, lens 3, spectroprism 4, lens 5, light collecting and transmitting device 6, second narrow slot 7, lens 8, second spectroprism 9 and lens 10.

The first spectroscope divides the light from source 1 into a spectrum by which light of a different frequency is directed to each different x coordinate on record 20. All of the light passing through record 20 is then collected and transmitted via device 6. This light is passed through slot 7 and is again divided into its spectrum by prism 9, each frequency being sent to a different position along the x axis of screen 21. Those light frequencies which are blocked by record 20 do not illuminate the associated area on screen 21. Hence, information on record 20 can be transmitted to screen 21.

The light throughput of the system is severely limited by the use of narrow slots 2 and 7. The light throughput can be increased by using Fresnel masks in place of slots 2 and 7. A Fresnel mask is a mask such as mask 31 (lower drawing) in which the transparency varies according to the Fresnel formula. Alternately, the light throughput of the system can be increased by using a noise mask such as mask 32 in place of slots 2 and 7. A noise mask is a mask which has a random variation in transparency in one direction. Ano...