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ERIC Number: ED051671
Record Type: RIE
Publication Date: 1971-May-31
Pages: 70
Abstractor: N/A
Microfilm Viewer Experiments. Final Report.
Reintjes, J. F.; And Others
Two new designs for microfilm viewers are described. Both viewers are front projection viewers utilizing matte surface display screens. One viewer with an adjustable horizontal screen has a normal magnification rate and is mounted on a desk top. The other viewer has a high (4x) magnification rate in a mini-theater configuration with remote microfiche positioning controls. The matte surface screen is believed to be an improvement over conventional screens. Both viewers utilize conventional projection optics to maintain image contrast in controlled lighting environments. Interference between the user and the projected light is virtually eliminated by oblique projection achieved by simple, practical techniques. A survey of users shows a marked preference for the mini-theater viewer over conventional near projection viewers. Two control modes for positioning microfiche were developed for the mini-theater viewer: a velocity-control system and a position-control system. A comparison of these two modes shows that users prefer the position-control system. A survey of fiber optics, photochromic materials, and conventional optics for possible use in a small portable, and self-powered viewer shows that conventional optics with clever packaging will best meet the design needs. (JY)
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: Office of Education (DHEW), Washington, DC. Bureau of Research.
Authoring Institution: Massachusetts Inst. of Tech., Cambridge. Electronic Systems Lab.