Wide-angle lens

• US 3,132,199 A
• Filed: 04/11/1961
• Issued: 05/05/1964
• Est. Priority Date: 04/16/1960
• Status: Expired due to Term

• Current Assignee: Eugen Hermanni, Heinz Marquardt, Otto Zimmermann
• Original Assignee: Eugen Hermanni, Heinz Marquardt, Otto Zimmermann
• Inventors: Zimmermann, Otto, HEINZ MARQUARDT, EUGEN HERMANNI
• Application Number:
  US04/102,166
• Time in Patent Office: 1,120 Days
• US Class Current: 359/755
• CPC Class Codes: G02B 13/04 Reversed telephoto objectives

Claims

1. A WIDE-ANGLE LENS FOR TRANSMITTING THE IMAGE OF AN OBJECT THROUGH AN APERTURE TO AN IMAGE-RECEIVING PLANE, COMPRISING A FIRST MENISCUS LENS MEANS HAVING AT LEAST ONE MENISCUS LENS OF NEGATIVE REFRACTIVE POWER AND CONCAVE IN THE DIRECTION OF THE APERTURE, SAID FIRST MENISCUS LENS MEANS BEING ARRANGED BETWEEN THE OBJECT AND THE APERTURE;

A FIRST POSITIVE LENS MEANS BETWEEN THE SAID MENISCUS LENS MEANS AND THE APERTURE, SIAD POSITIVE LENS MEANS HAVING AN AXIAL THICKNESS BETWEEN 35% AND 50% OF THE FOCAL LENGTH OF THE WIDE-ANGLE LENS;

A LENS ARRANGEMENT BETWEEN THE APERTURE AND THE IMAGE-RECEIVING PLANE, THE FIRST POSITIVE LENS MEANS AND THE LENS ARRANGEMENT DEFINING AN APERTURE AIR SPACE LARGER THAN 9% OF SAID FOCAL LENGTH, SAID LENS ARRANGEMENT CONSISTING OF A NEGATIVE LENS MEANS ADJACENT THE APERTURE AND CONSTITUTING A MENISCUS HAVING A CONCAVE SURFACE FACING THE APERTURE, THE RADIUS OF CURVATURE OF THE CONCAVE SURFACE BEING SMALLER THAN HE FOCAL LENGTH OF THE WIDE-ANGLE LENS, THE AXIAL THICKNESS OF THE NEGATIVE LENS MEANS BEING BETWEEN 10% AND 30% OF SAID FOCAL LENGTH, AND A SEPARATE LENS GROUP HAVING AT LEAST ONE POSITIVE LENS BETWEEN THE NEGATIVE LENS MEANS AND THE IMAGE-RECEIVING PLANE;

AND A SECOND MENISCUS LENS MEANS HAVING AT LEAST ONE MENISCUS LENS WITH A CONCAVE SURFACE OF NEGATIVE REFRACTIVE POWER IN THE DIRECTION OF THE APERTURE, SAID SECOND MENISCUS LENS MEANS BEING ARRANGED BETWEEN SAID LENS ARRANGEMENT AND THE IMAGE RECEIVING PLANE, THE AXIAL DISTANCES BETWEEN THE FIRST MENISCUS LENS MEANS AND THE FIRST POSITIVE LENS MEANS, ON THE ONE HAND, AND BETWEEN THE LENS ARRANGEMENT AND THE SECOND MENISCUS LENS MEANS, ON THE OTHER HAND, BEING BETWEEN 30% AND 70% OF SAID FOCAL LENGTH.