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Film Disc and Mechanism for Slide Projection

IP.com Disclosure Number: IPCOM000044759D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Rohen, JE: AUTHOR

Abstract

A low cost operator guidance display is provided for an interactive terminal such as a point of sale or cash issuing terminal by means of a rear projection display utilizing a step motor driven disc. Transparencies are mounted in the disc and rotated under control of a microcomputer program.

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Film Disc and Mechanism for Slide Projection

A low cost operator guidance display is provided for an interactive terminal such as a point of sale or cash issuing terminal by means of a rear projection display utilizing a step motor driven disc. Transparencies are mounted in the disc and rotated under control of a microcomputer program.

The figure shows a rear projection display including a projection lamp 11 and two mirrors 13 and 15. Light from the projection lamp is reflected by mirror 13 through condenser lens 17, a transparency projection lens 19, to mirror 15 which directs the image from the transparency onto screen 21.

A number of transparencies are mounted in disc 23, which is supported for rotation by step motor 25. A flange on disc 23 includes emitter apertures and a home position aperture which are detected by photo source and detector pair 27 to provide disc position feedback to the microcomputer. Disc 23 has two parts, a removable outer rim which supports the transparencies and a central hub fixed to the shaft of the step motor. Being removable, the terminal owner can conveniently replace transparencies in the outer rim of disc 23 in order to change the guidance messages presented to the terminal user. In order to keep cost low and disc diameter small, a common small format such as Kodak 110 is preferred so that transparencies can be made by existing camera equipment. Because the disc is supported on the motor shaft, it is simple and reliable, having...