JPS5224543A - Fresnel lens system for overhead projectors - Google Patents

Fresnel lens system for overhead projectors

Info

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
Application number
JP8795175A
Other languages
Japanese (ja)
Inventor
Zenjiro Doi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOKYO PLAST LENS KK
TOKYO PURASUCHITSUKU RENZU KK
TOUKIYOU PURASUCHITSUKU RENZU KK
Original Assignee
TOKYO PLAST LENS KK
TOKYO PURASUCHITSUKU RENZU KK
TOUKIYOU PURASUCHITSUKU RENZU KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TOKYO PLAST LENS KK, TOKYO PURASUCHITSUKU RENZU KK, TOUKIYOU PURASUCHITSUKU RENZU KK filed Critical TOKYO PLAST LENS KK
Priority to JP8795175A priority Critical patent/JPS5224543A/en
Publication of JPS5224543A publication Critical patent/JPS5224543A/en
Pending legal-status Critical Current

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
JP8795175A 1975-07-18 1975-07-18 Fresnel lens system for overhead projectors Pending JPS5224543A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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