`
`The following listing is the entire set of pending claims pursuant to 37 C.F.R.
`
`§l.121(c)(3)(i), with any mark—ups showing the changes made by the present preliminary
`
`amendment.
`
`1—20.
`
`(Cancelled)
`
`21.
`
`(New) A polarization conversion system operable to direct time—sequential left and right
`
`stereo images onto an overlapping area of a cinema projection screen, the system comprising:
`
`a polarization beam splitter (PBS) operable to receive from a projector lens randomly—
`
`polarized, diverging image light bearing the time—sequential left and right stereo images, to direct
`
`first diverging image light having a first state of polarization (SOP) along a first image light path,
`
`and to direct second diverging image light having a second SOP along a second image light path;
`
`a reflector located on one of the first and second image light paths and positioned to
`
`receive either of the first diverging image light or the second diverging image light, the reflector
`
`positioned so as to direct the received first or second diverging image light toward the cinema
`
`projection screen;
`
`a first polarization switch located on the first image light path, the first polarization
`
`switch operable to receive the first diverging image light from the first image light path, and to
`
`selectively translate the polarization state of the first diverging image light to one of a first output
`
`circular SOP and a second output circular SOP;
`
`a second polarization switch located on the second image light path, the second
`
`
`
`polarization switch operable to receive the second diverging image light from the second image
`
`light path, and to selectively translate the polarization state of the second image light to one of
`
`the first output circular SOP and the second output circular SOP;
`
`wherein the first polarization switch and the second polarization switch are located such
`
`that the first diverging image light received at the first polarization switch does not overlap with
`
`the second diverging image light received at the second polarization switch; and
`
`alignment optics configured such that the time—sequential left and right stereo images are
`
`overlaid on the cinema projection screen.
`
`22.
`
`(New) The polarization conversion system of claim 21, wherein the alignment optics are
`
`configured such that the time—sequential left and right stereo images are overlaid on the cinema
`
`projection screen within four—pixel accuracy.
`
`23.
`
`(New) The polarization conversion system of claim 21, wherein the polarization
`
`conversion system is configured to maintain spots sizes on the cinema projection screen within a
`
`fraction of a pixel.
`
`24.
`
`(New) The polarization conversion system of claim 21, wherein the polarization
`
`conversion system is configured to maintain lateral color within a pixel.
`
`25.
`
`(New) The polarization conversion system of claim 21, wherein the polarization
`
`conversion system is configured such that the time—sequential left and right stereo images are
`
`overlaid on the cinema projection screen within two—pixel accuracy.
`
`
`
`26.
`
`(New) The polarization conversion system of claim 21, wherein the first polarization
`
`switch and the second polarization switch select between the first output circular SOP and the
`
`second output circular SOP in synchronization with transmission of an image frame by a
`
`projector.
`
`27.
`
`(New) The polarization conversion system of claim 21, wherein the reflector comprises a
`
`prism.
`
`28.
`
`(New) The polarization conversion system of claim 21, wherein the reflector comprises a
`
`mirror.
`
`29.
`
`(New) The polarization conversion system of claim 21, wherein the reflector is located on
`
`the second image light path, and wherein the reflector is tiltable so that the reflector can direct
`
`image light on the second image light path.
`
`30.
`
`(New) The polarization conversion system of claim 21, further comprising a contrast
`
`enhancing element located on one of the first and second image light paths and operable to
`
`enhance contrast of the images projected on the cinema projection screen.
`
`31.
`
`(New) The polarization conversion system of claim 30, wherein the contrast enhancing
`
`element comprises a polarization rotator.
`
`
`
`32.
`
`(New) The polarization conversion system of claim 30, wherein the contrast enhancing
`
`element comprises a half—wave plate.
`
`33.
`
`(New) The polarization conversion system of claim 30, wherein the contrast enhancing
`
`element comprises a retarder stack with a plurality of polymer films having retardance.
`
`34.
`
`(New) The polarization conversion system of claim 30, wherein the contrast enhancing
`
`element comprises a polymer film.
`
`35.
`
`(New) The polarization conversion system of claim 21, wherein the reflector located on
`
`one of the first and second image light paths is tilted to overlay the time—sequential left and right
`
`stereo images onto the projection screen.
`
`36.
`
`(New) The polarization conversion system of claim 21, wherein the reflector is located on
`
`the second image light path.
`
`37.
`
`(New) The polarization conversion system of claim 36, wherein the second polarization
`
`switch is located after the reflector.
`
`38.
`
`(New) The polarization system of claim 21, wherein the polarization beam splitter
`
`comprises a wire grid polarization beam splitter.
`
`39.
`
`(New) The polarization system of claim 21, wherein the polarization beam splitter
`
`
`
`comprises a glass polarization beam splitter cube having first and second glass prisms.
`
`40.
`
`(New) The polarization conversion system of claim 21, wherein the polarization beam
`
`splitter comprises a tilted plate.
`
`41.
`
`(New) The polarization conversion system of claim 40, further comprising a flat plate
`
`positioned after the tilted plate polarization beam splitter, the flat plate being configurable in the
`
`system to reduce or correct astigmatism of an image at the projection screen.
`
`42.
`
`(New) The polarization conversion system of claim 21, further comprising one or more
`
`de—centered optical elements located after the polarization beam splitter.
`
`43.
`
`(New) The polarization conversion system of claim 42, wherein the one or more de—
`
`centered optical elements reduce astigmatism of an image at the projection screen.
`
`44.
`
`(New) The polarization conversion system of claim 21, wherein the reflector has a curved
`
`surface.
`
`45.
`
`(New) The polarization conversion system of claim 44 wherein the curved surface
`
`provides optical power that compensates for path length difference between the first and second
`
`image light paths.
`
`46.
`
`(New) The polarization conversion system of claim 21, wherein the reflector has a
`
`
`
`Fresnel lens or diffractive surface that provides optical power that compensates for path length
`
`difference between the first and second image light paths.
`
`47.
`
`(New) The polarization conversion system of claim 21, further comprising a refractive
`
`element on one of the first and second image light paths.
`
`48.
`
`(New) The polarization conversion system of claim 21, further comprising one of a lens
`
`having positive power on the first image light path and a lens having negative power on the
`
`second image light path.
`
`49. (New) The polarization conversion system of claim 21, further comprising a lens pair located
`
`on one of the first and second image light paths.
`
`50. (New) The polarization conversion system of claim 49, wherein the lens pair is operable to
`
`adjust a magnification difference between the first image light and the second image light.
`
`51. (New) The polarization conversion system of claim 49 wherein the lens pair comprises a first
`
`lens having positive power and a second lens having negative power.
`
`52. (New) The polarization conversion system of claim 49 wherein the lens pair comprises a
`
`doublet lens.
`
`53. (New) The polarization conversion system of claim 49 wherein the lens pair comprises a
`
`
`
`telephoto lens.
`
`54. (New) The polarization conversion system of claim 49 wherein the lens pair is adjustable by
`
`mechanically decentering a lens or element with optical power.
`
`55.
`
`(New) The polarization conversion system of claim 47, wherein the refractive element is
`
`located between the polarization beam splitter and one of the first and second polarization
`
`switches .
`
`56.
`
`(New) The polarization conversion system of claim 21, wherein the polarization beam
`
`splitter comprises a polarizing surface that is oriented at other than a 45 degree orientation from
`
`an optical axis of the diverging image light received from the projector.
`
`57.
`
`(New) The polarization conversion system of claim 21, wherein the reflector comprises a
`
`reflecting surface that is oriented at other than a 45 degree orientation from an optical axis of the
`
`one of the first and second image light paths that it receives.
`
`58.
`
`(New) The polarization conversion system of claim 21, wherein the alignment optics
`
`comprise mechanical components operable to tilt either of the polarization beam splitter or the
`
`reflector.
`
`59.
`
`(New) The polarization conversion system of claim 58, wherein the mechanical
`
`components are operable to tilt the polarization beam splitter.
`
`
`
`60.
`
`(New) The polarization conversion system of claim 58, wherein the mechanical
`
`components are operable to tilt the reflector.
`
`61.
`
`(New) The polarization conversion system of claim 21, wherein the alignment optics
`
`comprise a lens or other element with optical power in one of the first and second image light
`
`paths to adjust the overlap of the time—sequential left and right stereo images on the projection
`
`SCI'CCl’l .
`
`62.
`
`(New) The polarization conversion system of claim 61, wherein the lens or other element
`
`with optical power comprises a telephoto lens pair.
`
`63.
`
`(New) The polarization conversion system of claim 61, wherein the alignment optics
`
`further comprise mechanical components operable to de—center the lens or other element with
`
`optical power.
`
`64.
`
`(New) The polarization conversion system of claim 21, wherein at least one of the
`
`polarization beam splitter and the alignment optics include an anti—reflection coating thereon to
`
`minimize stray light reflection.
`
`65.
`
`(New) The polarization conversion system of claim 21, further comprising:
`
`a means, located on the first image light path, for correcting a magnification of images
`
`produced by the first diverging image light on the first image light path so that the magnification
`
`
`
`becomes substantially the same on the cinema projection screen as a projection of images
`
`produced by the second image light on the second image light path.
`
`66.
`
`(New) The polarization conversion system of claim 21, further comprising:
`
`a means for adjusting locations of images from the first image light and locations from
`
`the second image light so that the locations become substantially the same on the cinema
`
`projection screen.
`
`67.
`
`(New) The polarization conversion system of claim 21, further comprising:
`
`a means for adjusting one of size of images from the first image light and size of images
`
`from the second image light so that the size of images become substantially the same on the
`
`cinema projection screen.
`
`68.
`
`(New) The polarization conversion system of claim 67, wherein the means for adjusting
`
`the locations is achieved by at least one of (i) tilting the polarization beam splitter and (ii)
`
`mechanically de—centering at least one of the polarization beam splitter, the polarization rotator,
`
`and the reflector with optical power.
`
`69.
`
`(New) The polarization conversion system of claim 21, further comprising a telephoto
`
`lens pair located on the first image light path, wherein the telephoto lens pair is configured to
`
`collimate the first diverging image light on at least a portion of the first image light path.
`
`70.
`
`(New) The polarization conversion system of claim 21, further comprising a telephoto
`
`10
`
`
`
`lens pair located on the first image light path, wherein the telephoto lens pair is configured to
`
`converge the first diverging image light on at least a portion of the first image light path.
`
`71.
`
`(New) The polarization conversion system of claim 21, wherein the reflector has optical
`
`power.
`
`72.
`
`(New) The polarization conversion system of claim 21, wherein an optical component of
`
`the system is configured to collimate diverged image light passing therethrough in at least a
`
`portion of its path.
`
`73.
`
`(New) The polarization conversion system of claim 21, wherein an optical component of
`
`the system is configured to diverge collimated image light passing therethrough in at least a
`
`portion of its path.
`
`74.
`
`(New) The polarization conversion system of claim 21, wherein image light passing
`
`between the polarization beam splitter and the cinema projection screen comprises collimated
`
`image light in at least a portion of its path.
`
`75.
`
`(New) The polarization conversion system of claim 21, wherein image light passing
`
`through the system comprises collimated image light.
`
`76.
`
`(New) A polarization conversion system operable to direct time—sequential left and right
`
`stereo images onto an overlapping area of a cinema projection screen, the system comprising:
`
`ll
`
`
`
`a polarization beam splitter (PBS) operable to receive from a projector lens randomly—
`
`polarized, diverging image light bearing the time—sequential left and right stereo images, to direct
`
`first diverging image light having a first state of polarization (SOP) along a first image light path,
`
`and to direct second diverging image light having a second SOP along a second image light path;
`
`a reflector located on one of the first and second image light paths and positioned to
`
`receive either of the first diverging image light or the second diverging image light, the reflector
`
`positioned so as to direct the received first or second diverging image light toward the cinema
`
`projection screen;
`
`a first polarization switch located on the first image light path, the first polarization
`
`switch operable to receive the first diverging image light from the first image light path, and to
`
`selectively translate the polarization state of the first diverging image light;
`
`a second polarization switch located on the second image light path, the second
`
`polarization switch operable to receive the second diverging image light from the second image
`
`light path, and to selectively translate the polarization state of the second image light; and
`
`alignment optics configured such that the time—sequential left and right stereo images are
`
`overlaid on the cinema projection screen.
`
`77.
`
`(New) The polarization conversion system of claim 76, wherein the alignment optics are
`
`configured such that the time—sequential left and right stereo images are overlaid on the cinema
`
`projection screen within four—pixel accuracy.
`
`78.
`
`(New) The polarization conversion system of claim 76, wherein the first polarization
`
`switch selectively translates the polarization state of the first diverging image light to one of a
`
`12
`
`
`
`first output circular SOP and a second output circular SOP.
`
`79.
`
`(New) The polarization conversion system of claim 77, wherein the second polarization
`
`switch selectively translates the polarization state of the second diverging image light to one of
`
`the first output circular SOP and the second output circular SOP.
`
`80.
`
`(New) The polarization conversion system of claim 78, wherein the first polarization
`
`switch and the second polarization switch select between the first output circular SOP and the
`
`second output circular SOP in synchronization with transmission of an image frame by a
`
`projector.
`
`81.
`
`(New) The polarization conversion system of claim 76, further comprising:
`
`a means, located on the second image light path, for correcting a magnification of images
`
`produced by second diverging image light on the second image light path so that the
`
`magnification becomes substantially the same on a projection screen as a magnification of
`
`images produced by the first image light on the first image light path.
`
`82.
`
`(New) The polarization conversion system of claim 78, further comprising:
`
`a means for adjusting locations of images from the first image light and locations from
`
`the second image light so that the locations become substantially the same on the cinema
`
`projection screen.
`
`83.
`
`(New) The polarization conversion system of claim 82, wherein the means for adjusting
`
`l3
`
`
`
`the locations is achieved by at least one of (i) tilting the reflector and (ii) mechanically de—
`
`centering at least one of the polarization beam splitter, the polarization rotator, and the reflector
`
`with optical power.
`
`84.
`
`(New) The polarization conversion system of claim 76, further comprising a telephoto
`
`lens pair located on the first image light path, wherein the telephoto lens pair is located before
`
`the first polarization switch.
`
`85.
`
`(New) The polarization conversion system of claim 76, further comprising a telephoto
`
`lens pair located on the first image light path, wherein the telephoto lens pair is configured to
`
`collimate the first diverging image light on the first image light path in at least a portion of its
`
`path.
`
`86.
`
`(New) The polarization conversion system of claim 76, further comprising a telephoto
`
`lens pair located on the first image light path, wherein the telephoto lens pair is configured to
`
`converge the first diverging image light on at least a portion of the first image light path.
`
`87.
`
`(New) The polarization conversion system of claim 76, wherein the reflector has optical
`
`power.
`
`88.
`
`(New) The polarization conversion system of claim 76, wherein an optical component of
`
`the system is configured to collimate diverged image light passing therethrough in at least a
`
`portion of its path.
`
`14
`
`
`
`89.
`
`(New) The polarization conversion system of claim 76, wherein an optical component of
`
`the system is configured to diverge collimated image light passing therethrough in at least a
`
`portion of its path.
`
`90.
`
`(New) The polarization conversion system of claim 76, wherein image light passing
`
`between the polarization beam splitter and the cinema projection screen comprises collimated
`
`image light in at least a portion of its path.
`
`91.
`
`(New) The polarization conversion system of claim 76, wherein image light passing
`
`through the system comprises collimated image light in at least a portion of its path.
`
`92.
`
`(New) A polarization conversion system operable to direct time—sequential left and right
`
`stereo images onto an overlapping area of a cinema projection screen, the system comprising:
`
`a beam—splitting means for receiving from a projector lens randomly polarized and
`
`diverging image light bearing the time—sequential left and right stereo images, so as to direct first
`
`diverging image light having a first state of polarization (SOP) along a first image light path, and
`
`to direct second diverging image light having a second SOP along a second image light path;
`
`a reflecting means, located on one of the first and second image light paths, for receiving
`
`either of the first diverging image light or the second diverging image light and reflecting the
`
`received first or second diverging image light so that the received first or second diverging image
`
`light is directed towards the cinema project screen;
`
`a first switching means, located on the first image light path, for receiving the first
`
`15
`
`
`
`diverging image light from the first image light path so as to selectively translate the polarization
`
`state of the first diverging image light to one of a first output circular SOP and a second output
`
`circular SOP;
`
`a second switching means, located on the second image light path, for receiving the
`
`second diverging image light from the second image light path so as to selectively translate the
`
`polarization state of the second image light to one of the first output circular SOP and the second
`
`output circular SOP;
`
`wherein the first switching means and the second switching means are located such that
`
`the first diverging image light received at the first switching means does not overlap with the
`
`second diverging image light received at the second switching means; and
`
`optic alignment means for aligning the time—sequential left and right stereo images such
`
`that the time—sequential left and right stereo images are overlaid on the cinema projection screen.
`
`93.
`
`(New) The polarization conversion system of claim 92, wherein the optic alignment
`
`means are configured such that the time—sequential left and right stereo images are overlaid on
`
`the cinema projection screen within four—pixel accuracy.
`
`94.
`
`(New) The polarization conversion system of claim 92, wherein the reflecting means has
`
`optical power.
`
`95.
`
`(New) The polarization conversion system of claim 92, further comprising a collimating
`
`means for collimating diverged image light passing therethrough in at least a portion of its path.
`
`16
`
`
`
`96.
`
`(New) The polarization conversion system of claim 92, further comprising a converging
`
`means for converging diverged image light passing therethrough in at least a portion of its path.
`
`97.
`
`(New) The polarization conversion system of claim 92, further comprising:
`
`a means, located on the second image light path, for correcting a magnification of images
`
`produced by second diverging image light on the second image light path so that the
`
`magnification becomes substantially the same on the cinema projection screen as a magnification
`
`of images produced by the first image light on the first image light path.
`
`98.
`
`(New) The polarization conversion system of claim 92, wherein the optic alignment
`
`means is achieved by at least one of (i) tilting the polarization beam splitter and (ii) mechanically
`
`de—centering at least one of the polarization beam splitter, the polarization rotator and the
`
`reflector with optical power.
`
`17
`
`