Browse Prior Art Database

Color Filter Indexing Mechanism

IP.com Disclosure Number: IPCOM000079135D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 43K

Publishing Venue

IBM

Related People

Appel, A: AUTHOR [+4]

Abstract

There is described herein a mechanism, a control circuit for the mechanism, and a program for enabling the generation of color output with a black and white cathode-ray tube (CRT) plotter, such as the SC-4020 manufactured by the Stromberg-Carlson Corporation, San Diego, California. Figs. 1 and 2 are plan and partial perspective views, respectively, of the mechanism and its control circuitry. Referring to Figs. 1 and 2, a color wheel 10 has mounted therein different color filters generally designated by the numeral 12, wheel 10 being provided with cam extensions generally designated by the numeral 14. A microswitch 16 is provided to sense the positions of the cams 14. A microswitch 20 is provided to sense the position of the shutter 22, which changes position for film or paper recording.

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Color Filter Indexing Mechanism

There is described herein a mechanism, a control circuit for the mechanism, and a program for enabling the generation of color output with a black and white cathode-ray tube (CRT) plotter, such as the SC-4020 manufactured by the Stromberg-Carlson Corporation, San Diego, California. Figs. 1 and 2 are plan and partial perspective views, respectively, of the mechanism and its control circuitry. Referring to Figs. 1 and 2, a color wheel 10 has mounted therein different color filters generally designated by the numeral 12, wheel 10 being provided with cam extensions generally designated by the numeral 14. A microswitch 16 is provided to sense the positions of the cams 14. A microswitch 20 is provided to sense the position of the shutter 22, which changes position for film or paper recording. In the control circuit schematically depicted in Fig. 3, the microswitch 16 is in series with a relay coil 24 which, in turn, actuates clock motor 18. Microswitch 20 and its associated contacts are controlled by the position of the shutter 22. This shutter is positioned in the SC-4020 by the computer program.

The programmer can program the SC-4020 to alternately have the computer generated picture recorded on movie film or photographic paper. The SC-4020 interprets the computer generated commands by rotating the shutter 22 to block light from the CRT to the film camera, or to admit light to the film camera. The microswitch 20 is in a normally closed state when the shutter 20 is set for film and is in a normally open state when set for paper. When the shutter 22 is set for film, the relay 24 is closed and will drive the clock motor until one of the cams 14 contacts and opens microswitch 16 which in turn opens relay 24. The filter wheel 10 will immediately stop, because 60 V DC is applied to the clock motor 18 to dynamically brake the clock motor. While microswitch 16 is closed and the clock motor 18 was turning, the capacitor 30 is charged through resistor 26 and resistor 28. When under program control the shutter 22 is moved to paper position, the microswitch 20 is set in the normally open position and the capacitor 30 discharges through the relay coil 24 to turn the color wheel until none of the cams 14 open microswitch 16. A...