Claims
- 1. A beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU30##
- 2. A beam splitter according to claim 1, wherein the first and second transparent bases have the same refractive index n.sub.G.
- 3. A beam splitter according to claim 2, wherein the refractive index n.sub.G satisfies the following equation:
- 4. A beam splatter according to claim 1 having the following construction: (first transparent base)
- .vertline.(H/2.multidot.L.multidot.H/2).sup.m .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, .lambda..sub.0 denotes a center wavelength of a splittable wavelength range, and m denotes a repeat cycle.
- 5. A beam splitter according to claim 4, wherein the repeat cycle m is 5 or more.
- 6. A beam splitter according to claim 1 having the following construction:
- (first transparent base)
- .vertline.(H/2.multidot.(H/2.multidot.L.multidot.H/2).sup.m .multidot.H/2.vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, .lambda..sub.0 denotes a center wavelength of a splittable wavelength range, and m denotes a repeat cycle.
- 7. A beam splitter according to claim 6, wherein the repeat cycle m is 5 or more.
- 8. A beam splitter according to claim 1 having the following construction:
- (first transparent base)
- .vertline.(L/2.multidot.H.multidot.L/2).sup.m .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, .lambda..sub.0 denotes a center wavelength of a splittable wavelength range, and m denotes a repeat cycle.
- 9. A beam splitter according to claim 8, wherein the repeat cycle m is 5 or more.
- 10. A beam splitter according to claim 1 having the following construction:
- (first transparent base)
- .vertline.(L/2.multidot.(L/2.multidot.H.multidot.L/2).sup.m .multidot.L/2.vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, .lambda..sub.0 denotes a center wavelength of a splittable wavelength range, and m denotes a repeat cycle.
- 11. A beam splitter according to claim 10, wherein the repeat cycle m is 5 or more.
- 12. A beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU31##
- 13. A beam splitter according to claim 12, wherein the first and second transparent bases have the same refractive index n.sub.G.
- 14. A beam splitter according to claim 13, wherein the refractive index n.sub.G satisfies the following equation:
- 15. A beam splitter according to claim 12 having the following construction: (first transparent base)
- .vertline.(H/2.multidot.(H/2.multidot.L.multidot.H/2).sup.m ].multidot.A[(H/2.multidot.L.multidot.H/2).sup.n .multidot.H/2].vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, and A denotes a coefficient greater than 1 and equal to or smaller than 1.38.
- 16. A beam splitter according to claim 15, wherein the repeat cycles m and n are 5 or more, respectively.
- 17. A beam splitter according to claim 12 having the following construction:
- (first transparent base)
- .vertline.(H/2.multidot.L.multidot.H/2).sup.m .multidot.A(H/2.multidot.L.multidot.H/2).sup.n .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, and A denotes a coefficient greater than 1 and equal to or smaller than 1.38.
- 18. A beam splitter according to claim 17, wherein the repeat cycles m and n are 5 or more, respectively.
- 19. A beam splitter according to claim 12 having the following construction:
- (first transparent base)
- .vertline.(L/2.multidot.(L/2.multidot.H.multidot.L/2).sup.m ].multidot.A[(L/2.multidot.H.multidot.L/2).sup.n .multidot.L/2].vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, and A denotes a coefficient greater than 1 and equal to or smaller than 1.38.
- 20. A beam splitter according to claim 19, wherein the repeat cycles m and n are 5 or more, respectively.
- 21. A beam splitter according to claim 12 having the following construction:
- (first transparent base)
- .vertline.(L/2.multidot.H.multidot.L/2).sup.m .multidot.A(L/2.multidot.H.multidot.L/2).sup.n .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, and A denotes a coefficient greater than 1 and equal to or smaller than 1.38.
- 22. A beam splitter according to claim 21, wherein the repeat cycles m and n are 5 or more, respectively.
- 23. A beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a third alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.2 greater than the center wavelength .lambda..sub.1, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU32##
- 24. A beam splitter according to claim 23, wherein the first and second transparent bases have the same refractive index n.sub.G.
- 25. A beam splitter according to claim 24, wherein the refractive index n.sub.G satisfies the following equation:
- 26. A beam splitter according to claim 23 having the following construction: (first transparent base)
- .vertline.[H/2.multidot.(H/2.multidot.L.multidot.H/2).sup.m ].multidot.A[(H/2.multidot.L.multidot.H/2).sup.n .multidot.H/2].multidot.B[(H/2.multidot.L.multidot.H/2).sup.P .multidot.H/2].vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, p denotes a repeat cycle, A denotes a coefficient greater than 1 and equal to or smaller than 1.38, and B denotes a coefficient greater than 1.22 and smaller than 1.49.
- 27. A beam splitter according to claim 26, wherein the repeat cycles m,n, and p are 5 or more, respectively.
- 28. A beam splitter according to claim 23 having the following construction:
- (first transparent base)
- .vertline.(H/2.multidot.L.multidot.H/2).sup.m .multidot.A(H/2.multidot.L.multidot.H/2).sup.n .multidot.B(H/2.multidot.L.multidot.H/2).sup.p .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, p denotes a repeat cycle, A denotes a coefficient greater than 1 and equal to or smaller than 1.38, and B denotes a coefficient greater than 1.22 and smaller than 1.49.
- 29. A beam splitter according to claim 28, wherein the repeat cycles m,n, and p are 5 or more, respectively.
- 30. A beam splitter according to claim 23 having the following construction:
- (first transparent base)
- .vertline.[L/2.multidot.(L/2.multidot.H.multidot.L/2).sup.m ].multidot.A[(L/2.multidot.H.multidot.L/2).sup.n .multidot.L/2].multidot.B[(L/2.multidot.H.multidot.L/2).sup.p .multidot.L/2].vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, m denotes a repeat cycle, n denotes a repeat cycle, p denotes a repeat cycle, A denotes a coefficient greater than 1 and equal to or smaller than 1.38, and B denotes a coefficient greater than 1.22 and smaller than 1.49.
- 31. A beam splitter according to claim 30, wherein the repeat cycles m,n, and p are 5 or more, respectively.
- 32. A beam splitter according to claim 23 having the following construction:
- (first transparent base)
- .vertline.(L/2.multidot.H.multidot.L/2).sup.m .multidot.A(L/2.multidot.H.multidot.L/2).sup.n .multidot.B(L/2.multidot.H.multidot.L/2).sup.p .vertline.
- (second transparent base)
- wherein H denotes a .lambda..sub.0 /4 layer having the high refractive index n.sub.H, L denotes a .lambda..sub.0 /4 layer having the low refractive index n.sub.L, in denotes a repeat cycle, n denotes a repeat cycle, p denotes a repeat cycle, A denotes a coefficient greater than 1 and equal to or smaller than 1.38, and B denotes a coefficient greater than 1.22 and smaller than 1.49.
- 33. A beam splitter according to claim 32, wherein the repeat cycles m,n, and p are 5 or more, respectively.
- 34. An illumination optical system comprising:
- a light source which generates light having a visible wavelength range;
- a beam splatter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU33##
- 35. An illumination optical system according to claim 34, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
- 36. An illumination optical system comprising: a light source which generates light having a visible wavelength range;
- a beam splitter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising: a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers belong alternately laminated to one another,
- the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU34##
- 37. An illumination optical system according to claim 36, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
- 38. An illumination optical system comprising: a light source which generates light having a visible wavelength range;
- a beam splitter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a third alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.2 greater than the center wavelength .lambda..sub.1, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU35##
- 39. An illumination optical system according to claim 38, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
- 40. A projector comprising: an illumination optical system which produces light including a visible wavelength and having an aligned polarization direction;
- a color separator which separates the light from the illumination optical system into rays of a plurality of primary colors;
- a plurality of imaging members which are operable to produce a plurality of color light images utilizing the rays of the plurality of primary colors from the color separator;
- a projection optical system which introduces the plurality of color light images from the plurality of imaging members to a screen, respective optical axes of the plurality of color light images coinciding with one another;
- the illumination optical system including:
- a light source which generates light having a visible wavelength range;
- a beam splitter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU36##
- 41. A projector according to claim 40, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
- 42. A projector comprising: an illumination optical system which produces light including a visible wavelength and having an aligned polarization direction;
- a color separator which separates the light from the illumination optical system into rays of a plurality of primary colors;
- a plurality of imaging members which are operable to produce a plurality of color light images utilizing the rays of the plurality of primary colors from the color separator;
- a projection optical system which introduces the plurality of color light images from the plurality of imaging members to a screen, respective optical axes of the plurality of color light images coinciding with one another;
- the illumination optical system including:
- a light source which generates light having a visible wavelength range;
- a beam splitter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising: a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU37##
- 43. A projector according to claim 42, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
- 44. A projector comprising: an illumination optical system which produces light including a visible wavelength and having an aligned polarization direction;
- a color separator which separates the light from the illumination optical system into rays of a plurality of primary colors;
- a plurality of imaging members which are operable to produce a plurality of color light images utilizing the rays of the plurality of primary colors from the color separator;
- a projection optical system which introduces the plurality of color light images from the plurality of imaging members to a screen, respective optical axes of the plurality of color light images coinciding with one another;
- the illumination optical system including:
- a light source which generates light having a visible wavelength range;
- a beam splitter which splits a light beam from the light source into two components; and
- a converter which converts the polarization direction of one component to the polarization direction of the other component;
- the beam splitter comprising:
- a first transparent base;
- a second transparent base; and
- a polarizing multilayered film placed between the first and second transparent bases, the polarizing multilayered film including:
- a first alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- a second alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.1 greater than the center wavelength .lambda..sub.0, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another, and
- a third alternately laminated film for splitting a light beam of wavelength range having a center wavelength .lambda..sub.2 greater than the center wavelength .lambda..sub.1, and having high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H, the high refraction layers and the low refraction layers being alternately laminated to one another,
- the refractive index n.sub.H and the refractive index n.sub.L satisfying the following equation: ##EQU38##
- 45. A projector according to claim 44, wherein the light beam from the light source is incident onto the polarizing multilayered film at 45.degree..
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-178591 |
Jul 1997 |
JPX |
|
9-194161 |
Jul 1997 |
JPX |
|
Parent Case Info
This application is based on patent application Nos. 9-178591 and 9-194161 filed in Japan, the contents of which are hereby incorporated by reference.
US Referenced Citations (5)