DE2714497B1 - Symmetrical objective lens for photography or copying - has two lens groups totalling four lenses and aperture ratio of 1 to 10 and focal length of 600 mm - Google Patents

Symmetrical objective lens for photography or copying - has two lens groups totalling four lenses and aperture ratio of 1 to 10 and focal length of 600 mm

Info

Publication number
DE2714497B1
DE2714497B1 DE19772714497 DE2714497A DE2714497B1 DE 2714497 B1 DE2714497 B1 DE 2714497B1 DE 19772714497 DE19772714497 DE 19772714497 DE 2714497 A DE2714497 A DE 2714497A DE 2714497 B1 DE2714497 B1 DE 2714497B1
Authority
DE
Germany
Prior art keywords
lenses
lens
aperture ratio
aperture
focal length
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.)
Granted
Application number
DE19772714497
Other languages
German (de)
Other versions
DE2714497C2 (en
Inventor
Franz Schlegel
Josef Weiss
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.)
Optische Werke G Rodenstock
Original Assignee
Optische Werke G Rodenstock
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 Optische Werke G Rodenstock filed Critical Optische Werke G Rodenstock
Priority to DE19772714497 priority Critical patent/DE2714497C2/en
Publication of DE2714497B1 publication Critical patent/DE2714497B1/en
Application granted granted Critical
Publication of DE2714497C2 publication Critical patent/DE2714497C2/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/24Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances

Landscapes

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

Abstract

The objective lens for photographic or reproduction purposes is symmetric towards the diaphragm and has two lens groups totalling four lenses with an aperture ratio of 1:10. The lenses consist of two converging lenses and two diverging lenses which enclose the diaphragm. The small air gaps between the two lenses on the left and the right of the diaphragm facilitate a simple but very precise assembly of the lenses in the holder with the aid of spacer rings. The specification of the objective includes the radii (r) of individual lens surfaces, the thicknesses (d) of lenses, air gaps (1), and the Abbe numbers. The refractive indices are 1.6615 for the outer lenses and 1.6167 for the inner lens pair.

Description

Im Rahmen der Erfindung sind geringe Abweichungen von den in der Zahlentabelle des Patentanspruches angegebenen Werten möglich, soweit hierdurch die optischen Leistungswerte des Objektivs nicht wesentlich beeinflußt werden. In the context of the invention, slight deviations from those in the Table of figures of the patent claim specified values possible, as far as this the optical performance values of the lens are not significantly affected.

Claims (1)

Patentanspruch: Vierlinsiges, zur Blende symmetrisches Aufnahme- oder Reproduktionsobjektiv, bestehend aus einer Sammellinse, zwei den Blendenraum einschließenden Streulinsen sowie einer weiteren Sammellinse, mit einem Offnungsverhältnis von 1:10, gekennzeichnet durch folgende, auf eine Brennweite f' = 100 bezogene Daten: Ve r1 = + 20,26 dl = 2,76 1,6615 50,59 r2 = - 29,34 = = 930 r3 = - 25,23 d2 = 1,35 1,6167 44,07 r4 = +21,69 12 = 1,08 + 1,08 = 2,16 r5 = -21,69 d3 = 1,35 1,6167 44,07 r6 = +25,23 13 = 930 r7 = +29,34 d4 = 2,76 1,6615 50,59 r8 = - 20,26 Die Erfindung bezieht sich auf ein vierlinsiges, zur Blende symmetrisches Aufnahme- oder Reproduktionsobjektiv, bestehend aus einer Sammellinse, zwei den Blendenraum einschließenden Streulinsen sowie einer weiteren Sammellinse und einem Uffnungsverhältnis von 1:10. Claim: four-lens, symmetrical to the aperture or reproduction lens, consisting from a converging lens, two the aperture space including scattering lenses and a further converging lens with an aperture ratio of 1:10, characterized by the following data related to a focal length f '= 100: Ve r1 = + 20.26 dl = 2.76 1.6615 50.59 r2 = - 29.34 = = 930 r3 = - 25.23 d2 = 1.35 1.6167 44.07 r4 = +21.69 12 = 1.08 + 1.08 = 2.16 r5 = -21.69 d3 = 1.35 1.6167 44.07 r6 = +25.23 13 = 930 r7 = +29.34 d4 = 2.76 1.6615 50.59 r8 = - 20.26 The invention refers to a four-lens recording or reproduction lens symmetrical to the aperture, consisting of a converging lens, two diffusing lenses enclosing the diaphragm space as well as a further converging lens and an aperture ratio of 1:10. Objektive dieser Art sind bekannt. Lenses of this type are known. Aufgabe der Erfindung ist es, ein Objektiv zu schaffen, das gegenüber den bekannten Objektiven bessere Bildfeldebnungen und günstigere Komalage für den gesamten Abbildungsbereich bietet, verbesserte Farbabweichung aufweist und dabei eine besonders rationelle Fertigung zuläßt. The object of the invention is to create a lens that is opposite the known lenses better image field flattening and cheaper Komalage for the offers the entire imaging range, has improved color deviation and thereby allows a particularly efficient production. Diese Aufgabe wird durch Ausbildung des Objektivs mit den im Kennzeichen des Patentanspruches aufgeführten Konstruktionsdaten gelöst. This task is accomplished by training the lens with the features in the license plate of the claim listed construction data solved. Durch die geringen Luftabstände zwischen den beiden jeweils eine Linsengruppe rechts und links der Blende bildenden Linsen ist eine einfache und trotzdem sehr präzise Montage der Linsen in der Fassung mit Hilfe von Abstandsringen möglich. Due to the small air gap between the two, one each Lens group to the right and left of the diaphragm forming lenses is a simple and nevertheless very precise assembly of the lenses in the frame with the help of spacer rings possible. Bei bekannten Objektiven liegen die Linsen an mit hoher Präzision gefertigten Ansätzen der Fassung an.In known lenses, the lenses are in contact with high precision manufactured approaches of the frame. Durch die Einführung von Gläsern mit den Glaskonstanten n, = 1,6615, Ve 50,95 und ne = 1,6167, re 44,07 wird eine wesentlich verbesserte Farbabweichung des erfindungsgemäßen Objektivs ermöglicht. Es ergibt sich eine Verbesserung von Auflösung und Kontrast bei ein- und dreifacher Vergrößerung. By introducing glasses with the glass constants n = 1.6615, Ve 50.95 and ne = 1.6167, re 44.07 results in a significantly improved color deviation of the lens according to the invention allows. There is an improvement of Resolution and contrast at single and triple magnification. Ein erfindungsgemäßes Objektiv kann vorzugsweise eine Brennweite von etwa 600 mm aufweisen. An objective according to the invention can preferably have a focal length of about 600 mm. Die Zeichnung zeigt einen axialen Schnitt durch das erfindungsgemäße Objektiv, wobei die Radien der einzelnen Linsenflächen mit r, die Dicken der Linsen mit d und die Luftabstände mit l bezeichnet sind. The drawing shows an axial section through the inventive Objective, where the radii of the individual lens surfaces with r, the thicknesses of the lenses with d and the air gaps with l. ne gibt die Brechzahl, ve die Abbesche Zahl der verwendeten Gläser jeweils für den Spektralbereich e an.ne is the refractive index, ve is the Abbe number of glasses used each for the spectral range e.
DE19772714497 1977-03-31 1977-03-31 Four-lens recording or reproduction lens symmetrical to the aperture Expired DE2714497C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772714497 DE2714497C2 (en) 1977-03-31 1977-03-31 Four-lens recording or reproduction lens symmetrical to the aperture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772714497 DE2714497C2 (en) 1977-03-31 1977-03-31 Four-lens recording or reproduction lens symmetrical to the aperture

Publications (2)

Publication Number Publication Date
DE2714497B1 true DE2714497B1 (en) 1977-12-22
DE2714497C2 DE2714497C2 (en) 1978-08-24

Family

ID=6005299

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772714497 Expired DE2714497C2 (en) 1977-03-31 1977-03-31 Four-lens recording or reproduction lens symmetrical to the aperture

Country Status (1)

Country Link
DE (1) DE2714497C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949761A1 (en) * 1978-12-15 1980-06-26 Canon Kk REPRODUCTION LENS SYSTEM
EP0990935A2 (en) * 1998-09-30 2000-04-05 Canon Kabushiki Kaisha Lens for copying and image copying apparatus using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949761A1 (en) * 1978-12-15 1980-06-26 Canon Kk REPRODUCTION LENS SYSTEM
EP0990935A2 (en) * 1998-09-30 2000-04-05 Canon Kabushiki Kaisha Lens for copying and image copying apparatus using the same
EP0990935A3 (en) * 1998-09-30 2001-10-31 Canon Kabushiki Kaisha Lens for copying and image copying apparatus using the same

Also Published As

Publication number Publication date
DE2714497C2 (en) 1978-08-24

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8339 Ceased/non-payment of the annual fee