Polarizer apparatus for producing a generally polarized beam of light

• US 6,710,921 B2
• Filed: 01/15/2002
• Issued: 03/23/2004
• Est. Priority Date: 05/14/1998
• Status: Expired due to Fees

• Current Assignee: Moxtek (Polatechno Co.,Ltd.)
• Original Assignee: Moxtek (Polatechno Co.,Ltd.)
• Inventors: Hansen, Douglas P., Gunther, John
• Primary Examiner(s): Shafer, Ricky D.
• Application Number:
  US10/050,301
• Publication Number:
  US 20020101659A1
• Time in Patent Office: 798 Days
• Field of Search: 359/352, 359/486, 359/487, 359/495, 353/20, 362/19
• US Class Current: 359/485.05
• CPC Class Codes: F21V 9/14 for producing polarised light
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles

Abstract

A polarizing device has an arrangement of generally parallel elements disposed in an unpolarized source light beam for transmitting polarizations perpendicular to the elements and reflecting polarizations parallel to the elements. The elements may be disposed at substantially any incidence angle and may reflect the reflected beam at substantially any angle. The elements may be disposed on a substrate or embedded in a substrate. The elements may be disposed in a curved layer. The substrate may also have a curved surface. A polarizer apparatus may also have a mirror or the like for redirecting or recapturing the transmitted or reflected beam so they have similar directions or are directed to a common area. The device may also have a wave plate or the like for changing the polarization of the transmitted or reflected beams so they have the same polarization.

Claims

1. A polarizer device adapted for physically decoupling two orthogonal polarizations of a source light beam into two generally polarized beams and further treating at least one of the two beams, the device comprising:

a substrate comprising a single element configured for disposition in the source light beam and having a first generally planar surface and a second generally curved surface opposite the first surface;

a generally parallel arrangement of thin, elongated elements configured for disposition on the first generally planar surface of the substrate, the elements having a pitch less than approximately 0.4 micrometers, and a width and length sized to interact with the electromagnetic waves of the source light beam to generally (i) transmit light having a polarization oriented perpendicular to the length of the elements and defining a transmitted beam, and (ii) reflect light having a polarization oriented parallel with the length of the elements and defining a reflected beam, thereby providing two generally polarized beams;

a light recapture means physically positioned in a different location from a light source and configured for disposition in the reflected beam for intercepting and redirecting the reflected beam so that the reflected beam is not directed back into the light source; and

a polarization reorientation means configured for disposition in the reflected beam for changing the polarization orientation of substantially all the reflected beam so that both the reflected and transmitted beams have generally the same polarization, thereby substantially converting all the source light beam to a single polarization.

2. The polarizer device of claim 1, wherein the curved layer is parabolic.

3. The polarizer device of claim 1, wherein the curved layer is elliptical.

4. The polarizer device of claim 1, wherein the curved layer is cylindrical.

5. The polarizer device of claim 1, wherein the curved layer is spherical.

6. The polarizer device of claim 1, wherein the substrate is a lens.

7. The polarizer device of claim 1, wherein the substrate is a prism.

8. The polarizer device of claim 1, wherein the arrangement of elements is disposed on the first surface of the substrate and the second surface of the substrate.

9. The polarizer device of claim 1, wherein the arrangement of elements may be oriented with respect to the source light beam at substantially any incidence angle.

10. The polarizer device of claim 1, wherein the elements are equally spaced.

11. The polarizer device of claim 1, wherein the elements have a pitch of less than approximately 0.13 micrometers.

12. The polarizer device of claim 1, wherein the elements have a width and a pitch, and wherein the ratio of the width to pitch is approximately 40% to 60%.

13. The polarizer device of claim 1, wherein the elements have a length generally greater than approximately 0.7 micrometers.

14. The polarizer device of claim 1, wherein the elements have a pitch and a width generally between 90% to 10% of the pitch.

15. The polarizer device of claim 1, wherein the light recapture means comprises at least two optical elements.

16. The polarizer device of claim 1, wherein the light recapture means includes means for redirecting the at least one beam so that both the reflected and transmitted beams are parallel to one another.

17. The polarizer device of claim 16, wherein the reflected and transmitted beams have portions which are substantially collinear.

18. The polarizer device of claim 16, wherein the reflected and transmitted beams have generally the same divergence.

19. The polarizer device of claim 1, further comprising image projection components optically coupled to the polarizer device and operable as an image projection system.

20. The polarizer device of claim 1, further comprising light projection components optically coupled to the polarizer device and operable as a light projection system.

21. The polarizer device of claim 1, further comprising image display components optically coupled to the polarizer device and operable as an image display system.

22. A polarizer apparatus adapted for physically decoupling two orthogonal polarizations of a source light beam into two generally polarized beams and further treating at least one of the two beams, the device comprising:

a substrate comprising a single optical element configured for disposition in the source light beam and having a first generally planar surface and a second generally curved surface opposite the first surface;

a generally parallel arrangement of thin, elongated elements configured for disposition on the first generally planar surface of the substrate, the elements having a pitch less than approximately 0.13 micrometers, and a width and length sized to interact with the electromagnetic waves of the source light beam to generally (i) transmit light having a polarization oriented perpendicular to the length of the elements and defining a transmitted beam, and (ii) reflect light having a polarization oriented parallel with the length of the elements and defining a reflected beam, thereby providing two generally polarized beams;

a light recapture means physically positioned in a different location from a light source and configured for disposition in the reflected beam for intercepting and redirecting the reflected beam so that the reflected beam is not directed back into the light source; and

a polarization reorientation means configured for disposition in the reflected beam for changing the polarization orientation of substantially all the reflected beam so that both the reflected and transmitted beams have generally the same polarization, thereby substantially converting all the source light beam to a single polarization.

23. A polarizer device adapted for physically decoupling two orthogonal polarizations of a source light beam into two generally polarized beams and further treating at least one of the two beams, the device comprising:

a substrate comprising a single optical element configured for disposition in the source light beam and having a first generally planar surface and a second generally curved surface opposite the first surface;

a generally parallel arrangement of thin, elongated elements configured for disposition on the first generally planar surface of the substrate, the elements having a length, a pitch, and width generally between 90% to 10% of the pitch, the width and length being sized to interact with the electromagnetic waves of the source light beam to generally (i) transmit light having a polarization oriented perpendicular to the length of the elements and defining a transmitted beam, and (ii) reflect light having a polarization oriented parallel with the length of the elements and defining a reflected beam, thereby providing two generally polarized beams;

a light recapture means physically positioned in a different location from a light source and configured for disposition in the reflected beam for intercepting and redirecting the reflected beam so that the reflected beam is not directed back into the light source; and

a polarization reorientation means configured for disposition in the reflected beam for changing the polarization orientation of substantially all the reflected beam so that both the reflected and transmitted beams have generally the same polarization, thereby substantially converting all the source light beam to a single polarization.