GB970322A - Improvements in or relating to microfilm enlargers - Google Patents

Improvements in or relating to microfilm enlargers

Info

Publication number
GB970322A
GB970322A GB2117764A GB2117764A GB970322A GB 970322 A GB970322 A GB 970322A GB 2117764 A GB2117764 A GB 2117764A GB 2117764 A GB2117764 A GB 2117764A GB 970322 A GB970322 A GB 970322A
Authority
GB
United Kingdom
Prior art keywords
reflector
lens
enlarger
oct
light source
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.)
Expired
Application number
GB2117764A
Inventor
John Henry Jeffree
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.)
CAPS RES Ltd
Original Assignee
CAPS RES Ltd
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 CAPS RES Ltd filed Critical CAPS RES Ltd
Priority to GB2117764A priority Critical patent/GB970322A/en
Publication of GB970322A publication Critical patent/GB970322A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading
    • G03B21/118—Reader-printers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)

Abstract

970, 322. Enlarger projection systems. CAPS (RESEARCH) Ltd. Oct. 7, 1960 [Oct. 8, 1959], No. 21177/64. Divided out of 970,321. Headings G2A and G2J. An optical projection system for an enlarger comprises a light source, a semi-ellipsoidal reflector surrounding it, a film locating means, and a magnifying lens system, the reflector having surface reticulations or deformations in the area of the apex of its reflecting surface. The enlarger itself is generally as described in Specification 970,321. The light source 18 is preferably an ultra-violet lamp with a line discharge along the optical axis. It is surrounded by a reflector 19 of ellipsoidal shape, an approximate equation being given. The reflector is provided adjacent the aperture 9 at its vertex with smooth regular deformations to even out the illumination in the central part of the field. Then come, in order, a heat filter 20, shutter 21, condenser lens 56, and gate lens 54, of specified characteristics. The magnifying lens system is made up of a planoconvex lens 64, a cemented doublet 65 of a planoconcave and biconvex pair, an aspheric corrector plate 66, and a positive meniscus lens 67, all of specified characteristics and spacing, and including an aperture stop 68.
GB2117764A 1959-10-08 1959-10-08 Improvements in or relating to microfilm enlargers Expired GB970322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2117764A GB970322A (en) 1959-10-08 1959-10-08 Improvements in or relating to microfilm enlargers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2117764A GB970322A (en) 1959-10-08 1959-10-08 Improvements in or relating to microfilm enlargers

Publications (1)

Publication Number Publication Date
GB970322A true GB970322A (en) 1964-09-23

Family

ID=10158470

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2117764A Expired GB970322A (en) 1959-10-08 1959-10-08 Improvements in or relating to microfilm enlargers

Country Status (1)

Country Link
GB (1) GB970322A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems
US4642740A (en) * 1984-10-22 1987-02-10 General Electric Company Constant magnification light collection system

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