JPS5224543A - Fresnel lens system for overhead projectors - Google Patents
Fresnel lens system for overhead projectorsInfo
- Publication number
- JPS5224543A JPS5224543A JP8795175A JP8795175A JPS5224543A JP S5224543 A JPS5224543 A JP S5224543A JP 8795175 A JP8795175 A JP 8795175A JP 8795175 A JP8795175 A JP 8795175A JP S5224543 A JPS5224543 A JP S5224543A
- Authority
- JP
- Japan
- Prior art keywords
- lens system
- fresnel lens
- overhead projectors
- aberration
- concurrent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To obtain the second uniform light source of a right cylinder and of white color obtained by the mixing due to an additive color process, by eliminating spherical aberration of a principal wavelength with the use of a plurality of the Fresnel planes having the same shape, and taking the advantage of the concurrent great frame aberration.
COPYRIGHT: (C)1977,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8795175A JPS5224543A (en) | 1975-07-18 | 1975-07-18 | Fresnel lens system for overhead projectors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8795175A JPS5224543A (en) | 1975-07-18 | 1975-07-18 | Fresnel lens system for overhead projectors |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5224543A true JPS5224543A (en) | 1977-02-24 |
Family
ID=13929180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8795175A Pending JPS5224543A (en) | 1975-07-18 | 1975-07-18 | Fresnel lens system for overhead projectors |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5224543A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5942741A (en) * | 1994-03-04 | 1999-08-24 | Welch Allyn, Inc. | Apparatus for optimizing throughput in decoded-output scanners and method of using same |
-
1975
- 1975-07-18 JP JP8795175A patent/JPS5224543A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5942741A (en) * | 1994-03-04 | 1999-08-24 | Welch Allyn, Inc. | Apparatus for optimizing throughput in decoded-output scanners and method of using same |
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