Browse Prior Art Database

Photoprinter with Variable Character Size

IP.com Disclosure Number: IPCOM000090489D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Noell, NG: AUTHOR [+2]

Abstract

Images of characters from font 10 are projected through variable magnification lens 11 onto photographic film 12 in response to depression of print key 13. The magnification of lens 11 is controlled by screw thread adjustment 14 which also repositions fulcrum pin 15 relative to space control linkage 16. Each character 17 on font 10 is provided with exposure control spot 18 that is projected, through lens 11 to phototransistor 19 to control the exposure duration in response to variations in the light source and in magnification.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 88% of the total text.

Page 1 of 2

Photoprinter with Variable Character Size

Images of characters from font 10 are projected through variable magnification lens 11 onto photographic film 12 in response to depression of print key 13. The magnification of lens 11 is controlled by screw thread adjustment 14 which also repositions fulcrum pin 15 relative to space control linkage 16. Each character 17 on font 10 is provided with exposure control spot 18 that is projected, through lens 11 to phototransistor 19 to control the exposure duration in response to variations in the light source and in magnification.

During exposure of a character, feed control 20 energizes electromagnet 2l to engage clutch 22 and pivot link 23 clockwise about pin 15 by winding cord 24 on capstan 25. During this motion, spring 26 is stretched and cord 27 is allowed to be wound on capstan 28 by clock spring 29. Feed wheel 30 is not moved due to one-way clutch 31. As link 23 pivots, slide 32 carries phototransistor 33 to the right until it intercepts the path of light from a spacing mark 34 on font 10 that is geometrically associated with the character 17 being printed.

Mark 34 is projected through fixed magnification lens system 35. When phototransistor 33 senses spacing mark 34, electromagnet 21 is deactivated to release clutch 22. Spring 26 draws link 36 rightwardly and pulls cord 27 to drive feed wheel 30 counterclockwise an amount measured by the initial displacement of phototransistor 33 from fixed stop 37. As lens 11 is ad...