Browse Prior Art Database

Optical Binary Information Input Device

IP.com Disclosure Number: IPCOM000082188D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Ludeman, CP: AUTHOR

Abstract

Described is an apparatus to permit the electrooptical readout of binary data recorded upon a film strip, in an interactive teaching machine.

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Optical Binary Information Input Device

Described is an apparatus to permit the electrooptical readout of binary data recorded upon a film strip, in an interactive teaching machine.

Fig. 1 shows a typical layout of the optical elements in an conventional teaching machine comprising the light source 1, film image 2, lens systems 3, mirror 4, and frosted rear projection screen 5, onto which the image of the film 2 is projected.

Fig. 2 illustrates a portion of the film 2 which bears a sequence of optically encoded data pattern frames containing information, which serves to control the selection of the next optical image to be displayed in the interactive operational mode for the teaching machine.

Fig. 3 illustrates a cross-sectional view of the mirror 4 comprising the transparent protective coating 8, the 90 percent reflective surface 9, and the glass plate 10. Light transmitted to the film 2 is 90 percent reflected as beam 12 from the reflective surface 9 and directed to the frosted rear projection screen 5, and 10 percent transmitted as beam 11 through plate 10 to the light-sensitive pattern 6 attached to the back side of the mirror 4.

A plan view of the arrangement of the light-sensitive pattern 6 and the conductive pattern 7 is shown in Fig. 4. The light-sensitive pattern 6 receives the transmitted portion 11 of the light incident upon the mirror 4, which contains the optically encoded pattern for the data frames on the film shown in Fig. 2. In the example shown...