GB1196817A - Fresnel Field Lens for Reflex Cameras. - Google Patents

Fresnel Field Lens for Reflex Cameras.

Info

Publication number
GB1196817A
GB1196817A GB3135768A GB3135768A GB1196817A GB 1196817 A GB1196817 A GB 1196817A GB 3135768 A GB3135768 A GB 3135768A GB 3135768 A GB3135768 A GB 3135768A GB 1196817 A GB1196817 A GB 1196817A
Authority
GB
United Kingdom
Prior art keywords
field lens
fresnel
reflex cameras
heidecke
july
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
GB3135768A
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.)
Rollei Werke Franke und Heidecke GmbH and Co KG
Original Assignee
Rollei Werke Franke und Heidecke GmbH and Co KG
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 Rollei Werke Franke und Heidecke GmbH and Co KG filed Critical Rollei Werke Franke und Heidecke GmbH and Co KG
Publication of GB1196817A publication Critical patent/GB1196817A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

1,196,817. Fresnel Lenses. FRANKE & HEIDECKE G.m.b.H. [trading as ROLLEI-WERKE FRANKE & HEIDECKE]. July 1, 1968 [July 12, 1967], No.31357/68. Heading G2J. A Fresnel field lens for a reflex camera has a range of focal lengths and comprises Fresnel stages consisting of surfaces 1, 2 of the two extreme focal lengths which merge continuously into one another in the peripheral direction by formation of a series of undulations. In a modification each convex surface 1, 2 is replaced by two inclined surfaces forming an inverted V shape or the two inclined surfaces may be transposed to form a shallow V-shape.
GB3135768A 1967-07-12 1968-07-01 Fresnel Field Lens for Reflex Cameras. Expired GB1196817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP1267A DE1267966B (en) 1967-07-12 1967-07-12 Fresnel field lens for single lens reflex cameras

Publications (1)

Publication Number Publication Date
GB1196817A true GB1196817A (en) 1970-07-01

Family

ID=5659689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3135768A Expired GB1196817A (en) 1967-07-12 1968-07-01 Fresnel Field Lens for Reflex Cameras.

Country Status (4)

Country Link
CH (1) CH485237A (en)
DE (1) DE1267966B (en)
GB (1) GB1196817A (en)
SE (1) SE338708B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041969A1 (en) * 1979-11-07 1981-05-21 Canon K.K., Tokyo ADJUSTING DISC
DE3714830A1 (en) * 1987-05-05 1988-11-17 Leitz Ernst Gmbh COMBINED LIGHT-FIELD-DARK-FIELD REFLECTED LIGHTING DEVICE
DE4023192A1 (en) * 1990-07-20 1992-01-30 Heckler & Koch Gmbh AFOCAL OPTICAL IMAGING SYSTEM
SE9500746D0 (en) * 1995-03-01 1995-03-01 Hasselblad Ab Victor Device and method for facilitating this focusing of a camera

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171728B (en) * 1962-09-17 1964-06-04 Elbe Kamera Gmbh Field lens with different focal lengths for single lens reflex cameras

Also Published As

Publication number Publication date
DE1267966B (en) 1968-05-09
CH485237A (en) 1970-01-31
SE338708B (en) 1971-09-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee