GB611636A - Improvements in and relating to lens systems - Google Patents

Improvements in and relating to lens systems

Info

Publication number
GB611636A
GB611636A GB12367/46A GB1236746A GB611636A GB 611636 A GB611636 A GB 611636A GB 12367/46 A GB12367/46 A GB 12367/46A GB 1236746 A GB1236746 A GB 1236746A GB 611636 A GB611636 A GB 611636A
Authority
GB
United Kingdom
Prior art keywords
cement
lenses
layer
refractive
aspherical surface
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
GB12367/46A
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 Industrie de Oude Delft NV
Original Assignee
Optische Industrie de Oude Delft NV
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 Industrie de Oude Delft NV filed Critical Optische Industrie de Oude Delft NV
Publication of GB611636A publication Critical patent/GB611636A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Landscapes

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

Abstract

611,636. Lenses. NAAMLOOZE VENNOOTSCHAP OPTISCHE INDUSTRIE DE OUDE DELFT. April 24, 1946, No. 12367. Convention date, Sept. 5, 1942. [Class 97 (i)] In lenses having at least one aspherical surface, the difference in the refractive indicies of the media on either side of the surface for the mean wavelength of light used is at the most 0.3. This minimizes refractive errors due to errors in the aspherical surface. As shown, a planoconcave lens C is separated from a lens E having an aspherical surface 4 by a layer D of cement such as Canada balsam, synthetic resin or gelatine or a layer of liquid such as water, the refractive indices fulfilling the above condition. The lenses may be formed by coating a surface with cement and pressing the other to the cement. Alternatively, two complementary aspherical surfaces may be formed by a thin layer of cement.
GB12367/46A 1942-09-05 1946-04-24 Improvements in and relating to lens systems Expired GB611636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL611636X 1942-09-05

Publications (1)

Publication Number Publication Date
GB611636A true GB611636A (en) 1948-11-02

Family

ID=19788117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12367/46A Expired GB611636A (en) 1942-09-05 1946-04-24 Improvements in and relating to lens systems

Country Status (1)

Country Link
GB (1) GB611636A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4911538A (en) * 1989-07-13 1990-03-27 Lockheed Missiles & Space Company, Inc. Lens system comprising plastic and liquid lens elements with aspherical surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4911538A (en) * 1989-07-13 1990-03-27 Lockheed Missiles & Space Company, Inc. Lens system comprising plastic and liquid lens elements with aspherical surfaces

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