WO2005057266A1 - Objectif pour des images a grande profondeur de champ - Google Patents

Objectif pour des images a grande profondeur de champ Download PDF

Info

Publication number
WO2005057266A1
WO2005057266A1 PCT/DE2003/004091 DE0304091W WO2005057266A1 WO 2005057266 A1 WO2005057266 A1 WO 2005057266A1 DE 0304091 W DE0304091 W DE 0304091W WO 2005057266 A1 WO2005057266 A1 WO 2005057266A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
images
refractive power
field
focal depth
Prior art date
Application number
PCT/DE2003/004091
Other languages
German (de)
English (en)
Inventor
Jürgen GEFFE
Norbert Schuster
Original Assignee
Vision & Control Gmbh
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 Vision & Control Gmbh filed Critical Vision & Control Gmbh
Priority to DE20321310U priority Critical patent/DE20321310U1/de
Priority to DE10394368T priority patent/DE10394368D2/de
Priority to AU2003299266A priority patent/AU2003299266A1/en
Priority to PCT/DE2003/004091 priority patent/WO2005057266A1/fr
Publication of WO2005057266A1 publication Critical patent/WO2005057266A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G02B9/10—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only one + and one - component

Definitions

  • the invention relates to a lens for images with a large depth of field.
  • the invention can preferably be used for images with electronic cameras.
  • Stopping down corresponds to a magnification of the f-number k. Large depths of field are achieved for k> 5.6. Since lenses with a variable aperture are designed for the maximum aperture, the optics schemes require at least five lenses. Such lenses are complex and expensive.
  • the invention has for its object to provide a lens of the type mentioned, that for use in electronic cameras is suitable, allows a large depth of field with a minimal number of refractive surfaces and is inexpensive to produce.
  • the lens consists of an optical system with an f-number k> 5.6 to achieve a large depth of field with at least one collecting component that dominates the refractive power between the aperture diaphragm and the image plane and at least one correction element that improves distortion and image field curvature, with additional ones
  • Correction elements e.g. to correct color errors
  • the correction element preferably consists of a diverging lens and / or an aspherical deformation of a refractive surface.
  • the invention is characterized by a number of advantages. These include, in particular: 1.
  • the objective manages with a minimal number of optical elements, in particular lenses, and with a fixed diaphragm.
  • the lens enables an image quality that is tailored to the digital receiver. 3. All embodiments can be used in monochrome light.
  • a design that can also be used in polychrome light can be created with simple means.
  • FIG. 1 shows an optical arrangement with a Smythian field flattening lens as a correction element
  • FIG. 2 shows an arrangement with a plano-concave lens as a correction element
  • FIG. 3 shows an arrangement with an aspherical deformation of the collecting optical element as a correction element
  • FIG. 4 shows an arrangement with an aspherical deformation of the collecting optical element as a correction element and with an additional chromatic radius for correcting the color errors.
  • the optical arrangement consists of at least one collecting element and the refractive power dominating optical element 2, which is attached behind the aperture 1.
  • An astigmatism-corrected image is achieved by the suitable choice of the aperture spacing, the refractive index, the radii and the thickness of the collecting element 2.
  • the remaining disturbing aberrations in the image field curvature and distortion are reduced to a harmless level by at least one correction element 3.
  • Smythsche field flattening lens is used, the curvature of which is derived from the Petzval condition. This achieves a flat image field and corrects the distortion well. This arrangement is particularly suitable for images on analog image recorders.
  • FIG. 2 shows an exemplary embodiment in which a plano-concave lens is arranged as correction element 3, the position and curvature of which is determined in such a way that the main beam inclination behind the optical system does not exceed a predetermined maximum value.
  • An optimum between image field leveling and residual distortion can be set. This arrangement is particularly suitable for imaging on digital image recorders with microlens arrays.
  • FIG. 3 A further embodiment is shown in FIG. 3.
  • an aspherical deformation of the vertex sphere of the refractive power-determining surface of the collecting optical element 2 serves as correction element 3. Since the curvature of the convex surface of the collecting optical element 2 decreases with increasing field angle, the field curvature also decreases compared to the embodiment as shown in Figure 2. At the same time, the distortion is corrected and the main jet tendency is kept low.
  • a suitable choice of the conical constants of the surface determining the force of the collecting optical element 2 and the aperture spacing a minimal circle of confusion is achieved with completely compensated distortion in the entire image field.
  • This arrangement is particularly suitable for monochrome imaging on digital image recorders with microlens arrays. With this arrangement, large field-side object angles can be realized.
  • the arrangement shown in FIG. 4 has all the structural features and thus all the advantages of the arrangement shown in FIG. 3.
  • Optical element 2 determining refractive power introduced.
  • This chromatic radius 4 separates optical media with the same main refractive index and different dispersions.
  • the outstanding properties of the arrangement according to FIG. 3 thus also become effective for polychromatic light (for example white light).
  • This arrangement is particularly suitable for the color projection onto digital image recorders. With this arrangement, large field angles on the object side can also be realized.

Abstract

L'invention vise à créer un objectif pour des images à grande profondeur de champ, qui puisse être utilisé dans des caméras électroniques, qui permette une grande profondeur de champ pour un nombre minimum de surfaces réfringentes et qui puisse être produit à bon marché. A cet effet, on place, entre le diaphragme d'ouverture et le plan focal, au moins un élément focalisant dominant le pouvoir réfringent et au moins un élément correcteur servant à réduire la distorsion d'image et la courbure de champ d'image. L'invention concerne ainsi un objectif pour des images à grande profondeur de champ.
PCT/DE2003/004091 2003-12-11 2003-12-11 Objectif pour des images a grande profondeur de champ WO2005057266A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE20321310U DE20321310U1 (de) 2003-12-11 2003-12-11 Objektiv für Abbildungen mit großer Schärfentiefe
DE10394368T DE10394368D2 (de) 2003-12-11 2003-12-11 Objektiv für Abbildungen mit großer Schärfentiefe
AU2003299266A AU2003299266A1 (en) 2003-12-11 2003-12-11 Lens for images having great focal depth
PCT/DE2003/004091 WO2005057266A1 (fr) 2003-12-11 2003-12-11 Objectif pour des images a grande profondeur de champ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2003/004091 WO2005057266A1 (fr) 2003-12-11 2003-12-11 Objectif pour des images a grande profondeur de champ

Publications (1)

Publication Number Publication Date
WO2005057266A1 true WO2005057266A1 (fr) 2005-06-23

Family

ID=34672380

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/004091 WO2005057266A1 (fr) 2003-12-11 2003-12-11 Objectif pour des images a grande profondeur de champ

Country Status (3)

Country Link
AU (1) AU2003299266A1 (fr)
DE (1) DE10394368D2 (fr)
WO (1) WO2005057266A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701207A (en) * 1994-12-28 1997-12-23 Konica Corporation Camera with a fixed focal length lens
US5999334A (en) * 1997-01-14 1999-12-07 Minolta Co., Ltd. Fixed focal length lens system
US6067196A (en) * 1996-01-16 2000-05-23 Minolta Co., Ltd. Zoom lens system
EP1302801A1 (fr) * 2001-10-12 2003-04-16 Milestone Co., Ltd. Système d'imagerie à deux lentilles
EP1357414A1 (fr) * 2002-04-16 2003-10-29 Konica Corporation Objectif miniature de capture d'images et terminal mobile équipé avec un tel objectif
EP1367422A2 (fr) * 2002-05-29 2003-12-03 Enplas Corporation Système optique à grand angle pour dispositif de prise d'images à semiconducteurs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701207A (en) * 1994-12-28 1997-12-23 Konica Corporation Camera with a fixed focal length lens
US6067196A (en) * 1996-01-16 2000-05-23 Minolta Co., Ltd. Zoom lens system
US5999334A (en) * 1997-01-14 1999-12-07 Minolta Co., Ltd. Fixed focal length lens system
EP1302801A1 (fr) * 2001-10-12 2003-04-16 Milestone Co., Ltd. Système d'imagerie à deux lentilles
EP1357414A1 (fr) * 2002-04-16 2003-10-29 Konica Corporation Objectif miniature de capture d'images et terminal mobile équipé avec un tel objectif
EP1367422A2 (fr) * 2002-05-29 2003-12-03 Enplas Corporation Système optique à grand angle pour dispositif de prise d'images à semiconducteurs

Also Published As

Publication number Publication date
AU2003299266A1 (en) 2005-06-29
DE10394368D2 (de) 2006-10-26

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