Imaging system with optimized extended depth of focus

Patent metadata

Field	Value
Publication number	US-10175392-B2
Application number	US-201514841341-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Feb 9, 2010
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

An optical processor is presented for applying optical processing to a light field passing through a predetermined imaging lens unit. The optical processor comprises a pattern in the form of spaced apart regions of different optical properties. The pattern is configured to define a phase coder, and a dispersion profile coder. The phase coder affects profiles of Through Focus Modulation Transfer Function (TFMTF) for different wavelength components of the light field in accordance with a predetermined profile of an extended depth of focusing to be obtained by the imaging lens unit. The dispersion profile coder is configured in accordance with the imaging lens unit and the predetermined profile of the extended depth of focusing to provide a predetermined overlapping between said TFMTF profiles within said predetermined profile of the extended depth of focusing.

First claim

The invention claimed is:

1. An optical imaging arrangement, comprising:
an optical imaging element for acting upon light comprising visible wavelengths;
a phase coder associated with the optical imaging element; and
a dispersion coder associated with the optical imaging element,
the phase coder comprising a first pattern of features that induces a non-diffractive phase effect to the light comprising visible wavelengths, the first pattern of features comprising a first number of oscillations between radial coordinates of 0.5 mm and 2 mm,
the phase coder providing additional depth of focus in addition to a depth of focus of the optical imaging element,
the dispersion coder comprising a second pattern of features that induces a diffractive effect to the light comprising visible wavelengths, the second pattern of features comprising a second number of oscillations between radial coordinates of 0.5 mm and 2 mm,
the second number of oscillations being greater than the first number of oscillations,
the dispersion coder providing focus shifts of through focus modulation transfer function (TFMTF) profiles associated with the optical imaging element and the phase coder for multiple wavelengths of the light comprising visible wavelengths so as to increase an amount of overlap of the TFMTF profiles for the multiple wavelengths.

2. The optical imaging arrangement of claim 1 , wherein the optical Imaging element comprises a lens.

3. The optical imaging arrangement of claim 1 , wherein the phase coder provides the additional depth of focus without adding optical power beyond that of the optical imaging element.

4. The optical imaging arrangement of claim 1 , wherein the phase coder provides the additional depth of focus without reducing an aperture of the optical imaging element.

5. The optical imaging arrangement of claim 1 , wherein the phase coder provides the additional depth of focus without causing loss of energy.

6. The optical imaging arrangement of claim 1 , wherein the phase coder provides the additional depth of focus without causing loss of resolution.

7. The optical imaging arrangement of claim 1 , wherein the dispersion coder provides chromatic aberration correction.

8. The optical imaging arrangement of claim 1 , wherein the first pattern is a radial pattern and the second pattern is a radial pattern.

9. The optical imaging arrangement of claim 1 , wherein the first and second patterns are located at first and second sur aces, respectively, of the optical imaging element.

10. The optical imaging arrangement of claim 1 , wherein the first and second patterns are in the form of first and second surface reliefs, respectively.

11. The optical imaging arrangement of claim 1 , wherein the first and second patterns are incorporated in the optical imaging element.

12. The optical imaging arrangement of claim 1 , wherein one of the first and second patterns is incorporated in the optical imaging element, and the other of said first and second patterns comprises a mask located at a side of the optical imaging element.

13. The optical imaging arrangement of claim 1 , wherein the first and second patterns are disposed at a same surface and define together a combined pattern comprising a superposition of said first and second patterns.

14. The optical imaging arrangement of claim 1 , wherein the optical imaging arrangement is configured as a lens.

15. The optical imaging arrangement of claim 1 , wherein the imaging arrangement is configured as an ophthalmic lens.

16. The optical imaging arrangement of claim 15 , wherein the ophthalmic lens is a multi-focal lens.

17. The optical imaging arrangement of claim 1 , wherein the imaging arrangement is configured as a contact lens.

18. The optical imaging arrangement of claim 17 , wherein the contact lens is a multi-focal lens.

19. The optical imaging arrangement of claim 1 , wherein the optical imaging arrangement comprises multiple zones having different optical powers.

20. The optical imaging arrangement of claim 1 , wherein the first pattern of features of the phase coder comprises three oscillations between radial coordinates of 0.5 mm and 2 mm, and wherein the second pattern of features of the dispersion coder comprises seven oscillations between radial coordinates of 0.5 mm and 1.5 mm.

Assignees

• Holden Brien Vision Inst

Inventors

• Zalevsky Zeev
• Zlotnik Alex
• Raveh Ido
• Ben-Yaish Shai
• Limon Ofer
• Yehezkel Oren
• Lahav Karen

Classifications

• A61F2/16

  Intraocular lenses · CPC title

• G02B27/0075

  with means for altering, e.g. increasing, the depth of field or depth of focus · CPC title

• A61F2/1648

  Multipart lenses · CPC title

• Y10S977/902

  Specified use of nanostructure · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title