KR19980024342A - Polarizing device and projection optical device using same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing device and a projection optical device using the same, and has an object of increasing the illuminance of a display screen to 1000 to 1200 lumen. The solution includes a 350W metal halide lamp 11, a polarizing device 13, a light valve 15, an analyzer 16, and a projection lens 19 in the order that light travels. In the polarizer 13, the reflective first polarizing element 20 and the absorption type second polarizing element 21 in which the dye-based molecules are dispersed are simultaneously aligned with each of the transmission axes 22 and 24 in the X-axis direction. It is a structure arranged in accord. The first polarization element 20 does not absorb light and is difficult to heat. Absorption of the second polarization element 21 is limited to Y polarization remaining without being reflected by the first polarization element 20, and the second polarization element 21 is also difficult to heat. The second polarization element 21 is configured to send out polarized light having a high degree of polarization.

Description

Polarizing device and projection optical device using same

The present invention relates to a polarizing device and a projection optical device using the same.

In recent years, projection optical devices using light valves have been required to have high illumination in order to improve the quality of surface screens. Conventionally, the illuminance of a display screen is about 600 lumens, but in recent years, the illuminance of 1000-1200 lumens is calculated | required. In order to increase the brightness of the display screen, it is necessary to increase the brightness of the light source. In the past, a 250W metal halide lamp was used, but for example, a 350W metal halide lamp was used. The illuminance at the surface of the polarizer disposed between the light valve and the metal halide lamp is approximately doubled from conventional maximum 1 million lux to maximum 2 million lux. Therefore, the polarizer had to be made a structure strong against heat.

The projection science apparatus using the conventional light valve is a structure in which a 250W metal halide lamp, a polarizer, a light valve, an analyzer, and a projection lens are arranged in the order in which light travels.

The polarizer has a structure in which dye-based molecules are dispersed or oxo-based molecules are dispersed. This polarizing device is a so-called absorption type which mainly absorbs unnecessary polarization unnecessary in the light valve and mainly transmits the necessary polarization necessary in the light valve.

When unnecessary unnecessary polarization is absorbed in the light valve, it is converted into heat and the temperature of the polarizer is raised. In order to ensure reliability, such as lifetime, in polarizer which disperse | distributed dye type injection, it is necessary to set the temperature of polarizer itself to 70 degrees C or less, and in the polarizer which disperse | distributed oxo type molecule, it is necessary to set the temperature of polarizer itself to 60 degrees C or less. When the 250W metal halide lamp is a 350W metal halide lamp, the polarizer is irradiated with light of up to 2 million lux, and the temperature rises above the allowable temperature by absorbing about half of this unnecessary polarization. Therefore, in order to suppress the temperature of a polarizer below the said allowable temperature, a large-scale cooling structure is needed, As a result, a projection optical apparatus becomes large and expensive.

Therefore, an object of the present invention is to provide a polarizing device that solves the above problems and a projection optical device using the same. A more specific problem of the present invention is to provide a polarizer which reflects unnecessary light from a light source and passes only a desired polarization component, and a projection optical device using such a polarizer.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a projection optical device as a first embodiment of the present invention.

FIG. 2 shows a first polarization element of FIG. 1; FIG.

3 is a view showing a modification of the first polarization element of FIG.

4 shows the transmittance characteristics of the first polarization element.

5 shows reflectance characteristics of a first polarization element.

6 shows transmittance characteristics of a second polarization element.

7 is a view showing transmittance characteristics of a polarizer.

8 is a diagram showing a configuration example of a first polarization element and reflection characteristics thereof;

9 is a diagram showing another configuration example of the first polarization element and its reflection characteristics.

10 is a view showing still another configuration example of the first polarization element.

11 is a view showing still another configuration example of the first polarization element.

Fig. 12 is a view showing a projection optical device according to the second embodiment of the present invention.

Fig. 13 is a view showing a projection optical device as a third embodiment of the present invention.

Fig. 14 is a view showing a projection optical device as a fourth embodiment of the present invention.

Fig. 15 is a view showing a projection optical device as a fifth embodiment of the present invention.

Fig. 16 is a view showing a projection optical device as a sixth embodiment of the present invention.

FIG. 17 is a view showing the polarizer 80B shown in FIG. 12 taken out.

FIG. 18 is a view showing a transmittance characteristic of required polarization of the polarizer of FIG. 17; FIG.

FIG. 19 is a view showing line I in FIG. 4 and line IV in FIG. 6 side by side;

20 is a view showing a projection optical device according to the seventh embodiment of the present invention.

Fig. 21 is a view showing a projection optical device as an eighth embodiment of the present invention.

22 illustrates generation of stray light.

Fig. 23 is a detailed diagram illustrating stray light.

24 is a ninth embodiment of the present invention;

Fig. 25 is a view showing a part of a projection optical device according to the tenth embodiment of the present invention.

Fig. 26 is a view showing a part of a projection optical device according to the eleventh embodiment of the present invention.

Fig. 27 is a view showing a part of a projection optical device according to the twelfth embodiment of the present invention.

Fig. 28 is a view showing a part of a projection optical device according to the thirteenth embodiment of the present invention.

Fig. 29 is a view showing a part of a projection optical device as a fourteenth embodiment of the present invention.

30 is a view showing a part of a projection optical device as a fifteenth embodiment of the present invention.

Fig. 31 is a view showing a part of a projection optical device according to the sixteenth embodiment of the present invention.

32 is a diagram showing a part of a projection optical device as a seventeenth embodiment of the present invention;

Fig. 33 is a view showing a part of a projection optical device according to the eighteenth embodiment of the present invention.

Fig. 34 is a view showing a part of a projection optical device as a nineteenth embodiment of the present invention.

Fig. 35 is a view showing a part of a projection optical device according to the twentieth embodiment of the present invention.

Fig. 36 is a view showing a part of a projection optical device as a twenty-first embodiment of the present invention.

Fig. 37 is a view showing a part of a projection optical device as a twenty-second embodiment of the present invention.

Fig. 38 is a diagram showing a part of a projection optical device as a twenty-third embodiment of the present invention.

FIG. 39 shows a part of a projection optical device as a twenty-fourth embodiment of the present invention;

40 is a diagram showing a part of a projection optical device as a twenty-fifth embodiment of the invention;

Fig. 41 is a view showing a part of a projection optical device according to the 26th embodiment of the present invention.

Fig. 42 is a view showing a part of a projection optical device as a twenty-seventh embodiment of the present invention.

Fig. 43 is a view showing a part of a projection optical device according to the 28th embodiment of the present invention.

Fig. 44 is a view showing a part of a projection optical device as a twenty-ninth embodiment of the present invention.

45 (a) and 45 (b) show the configuration of a polarization processing apparatus according to a thirtieth embodiment of the present invention.

46 is a diagram showing the configuration of a polarization processing apparatus according to a thirty-first embodiment of the present invention.

Fig. 47 is a diagram showing the construction of a polarization processing apparatus according to a thirty-first embodiment of the present invention.

48 is a diagram showing the configuration of a polarization processing apparatus according to a thirty-second embodiment of the present invention.

Fig. 49 is a diagram showing the construction of a polarization processing device according to a thirty-third embodiment of the present invention.

50 is a diagram showing the configuration of a polarization processing apparatus according to a thirty-fourth embodiment of the present invention.

Fig. 51 is a diagram showing the construction of a polarization processing device according to a thirty-fifth embodiment of the invention.

Fig. 52 is a diagram showing the construction of a polarization processing apparatus according to a thirty sixth embodiment of the present invention.

Fig. 53 is a diagram showing the configuration of a polarization processing apparatus according to a thirty-seventh embodiment of the present invention.

54 is a diagram showing the configuration of a polarization processing apparatus according to a thirty eighth embodiment of the present invention.

Fig. 55 is a diagram showing the construction of a projection optical apparatus according to a 39th embodiment of the present invention.

56 is a diagram showing the configuration of a projection optical device according to a forty embodiment of the present invention.

FIG. 57 is a diagram showing the configuration of a direct type liquid crystal display device according to a forty-first embodiment of the present invention; FIG.

58 is a diagram showing the configuration of a direct type liquid crystal display device according to a forty-second embodiment of the present invention;

Fig. 59 is a view showing a spectrum of white light beams emitted from a conventional light source.

60 shows the characteristics of an infrared cut filter;

FIG. 61 shows a spectrum in the case where the light beam of the spectrum of FIG. 59 is passed through the filter of FIG. 60; FIG.

FIG. 62 shows a spectrum obtained when a light beam of the spectrum of FIG. 61 is passed through a reflective polarizing element; FIG.

Fig. 63 is a diagram showing the configuration of a projection optical apparatus according to a 43rd embodiment of the present invention.

64 is a diagram showing the configuration of a projection optical device according to a 44th embodiment of the present invention.

65 is a diagram showing the configuration of a projection optical device according to a forty-fifth embodiment of the invention.

66 is a diagram showing the configuration of a projection optical device according to a forty-sixth embodiment of the present invention;

67 is a diagram showing the configuration of a projection optical device according to a forty-seventh embodiment of the present invention.

68 is a diagram showing the configuration of a projection optical device according to a forty-eighth embodiment of the present invention.

69 (a) and (b) are diagrams for explaining the action of the ultraviolet cut filter used in the configuration shown in FIG. 68;

FIG. 70 is another diagram illustrating the action of the ultraviolet cut filter used in the configuration of FIG. 68; FIG.

71 is a diagram showing the configuration of an ultraviolet cut filter according to a forty-ninth embodiment of the present invention;

72 (a) and (b) are diagrams showing the structure of an ultraviolet cut filter according to a fifty embodiment of the present invention.

73 (a) and (b) are diagrams showing the structure of an ultraviolet cut filter according to a fifty-first embodiment of the present invention;

The present invention,

As described in claim 1

It is a polarizer which irradiates incident light and converts it into the polarization which has a predetermined polarization plane,

A first polarizing element for selectively passing a polarizing component having the predetermined polarization plane among the polarization components included in the incident light and reflecting another polarization component;

It becomes a 2nd polarization element which permeate | transmits the polarization component which has the said predetermined polarization surface, and absorbs another polarization component,

The first polarization element and the second polarization element are arranged to be aligned with each transmission axis,

In this case, the first polarization element is configured to be positioned on the optical path, the upstream side of the incident light with respect to the second polarization element, or

As described in claim 2, the first polarizing element and the second polarizing element are formed in close contact with each other.

As described in claim 3

The polarizing apparatus according to claim 1 or 2, further comprising a condenser lens disposed on an upstream side of the incident path than the first polarizing element.

As described in claim 4,

The polarizing device according to claim 3, wherein the condenser lens is formed in close contact with the first polarization element.

Or as described in claim 5,

The first polarizing element includes a liquid crystal layer for selectively reflecting one of circularly polarized light in a right direction and circularly polarized light in a left direction, and an optical beam formed adjacent to the liquid crystal layer through an optical path of a light beam passing through the first polarized light element. According to any one of claims 1 to 4, characterized in that the phase difference compensation plate for changing the phase of about 1/4 wavelength or

As described in claim 6,

The first piece and the element act on a light beam of three primary colors, and include a first liquid crystal layer selectively reflecting one of a circularly polarized component of right rotation and a circularly polarized component of left rotation, and a second primary color of three primary colors. A second liquid crystal layer which acts on the light beam and selectively reflects one of the right-handed circularly polarized light component and the left-handed circularly polarized light component, and the three-color primary light beam acts on the right-handed circularly polarized light component and the left-right circularly polarized light A lamination structure in which a third liquid crystal layer selectively reflecting one of the components is laminated, and a phase difference compensation layer formed on one side of the lamination structure to change the phase of the light beam passing through the lamination structure by a quarter wavelength. By the polarizing apparatus of Claim 1 set forth, or as described in Claim 7,

The first polarization element is a first liquid crystal layer which acts on the light beam of the three primary colors and selectively reflects one of the right-handed circularly polarized light component and the left-handed circularly polarized light component, and with respect to the first color light beam. A first phase difference compensation layer that acts to change its phase by about a quarter wavelength, and a second that selectively reflects one of the right-handed circularly polarized light component and the left-handed circularly polarized light component by acting on a light beam of three primary colors; A liquid crystal layer, a second phase difference compensation layer which acts on the light beam of the second color and changes its phase by about a quarter wavelength, and a circularly polarized light component of right rotation and left rotation by acting on the light beam of three primary colors; A third liquid crystal layer selectively reflecting one side of the circularly polarized light component, and a third phase difference compensation layer which acts on the light beam of the third color and changes its phase by about a quarter wavelength. of By polarizing device or

As described in claim 8,

Said 1st polarizing element is equipped with the filter which blocks an ultraviolet-ray at the side which the said incident light injects, The polarizing apparatus of any one of Claims 1-7 characterized by the above, or

As described in claim 9,

The said filter is a multilayer film, and is a ultraviolet-ray reflection filter which reflects an ultraviolet-ray by the polarizing apparatus of Claim 8, or

As described in claim 10,

The filter is disposed in the optical path of the incident light, and is made up of a plurality of filter elements each reflecting ultraviolet rays, by the polarizing apparatus according to claim 8 or 9, or

As described in claim 11,

Of the plurality of filter elements, one of the filter elements is arranged inclined with respect to the other filter element, and according to the polarizing apparatus of claim 10, or

As described in claim 12,

Said filter is formed in close contact with the said 1st polarizing element, The polarizing apparatus of any one of Claims 8-10 characterized by the above-mentioned, or

As described in claim 13,

With a light source,

A color separation optical system arranged in an optical path of the output light beam emitted from the light source and separating it into a plurality of color light beams, and a color light beam arranged in one optical path of the plurality of color light beams respectively and passing through the optical path A plurality of light valves to form a modulated color light beam;

A plurality of polarization means each inserted into an incident optical path of the color light beam incident on one of the plurality of light valves, and polarizing the color light beam passing through the incident light path on a predetermined polarization plane;

A projection optical device comprising a projection optical system for projecting a synthesized light beam formed by synthesizing the modulated color light beam on a screen,

At least one of the plurality of polarizing means selectively passes a predetermined linear polarization component having the predetermined polarization plane among polarization components in the incident color light beam, and substantially reflects polarization components other than the linear polarization component. By a projection optic, characterized by having a reflective polarizing element, or

As described in claim 14,

Each of the plurality of polarizing means has the reflective polarizing element, by the projection optical device according to claim 13, or

As described in claim 15,

The polarizing means having the reflective polarizing element selectively absorbs the linearly polarized light component in the advancing direction of the color light beam and behind the reflective polarizing element, and absorbs substantially the polarized light component other than the linearly polarized light component. The projection polarizing element according to claim 13 or 14, wherein the polarizing element is further disposed so that the transmission axis of the reflective polarization element and the transmission axis of the absorption polarization element substantially coincide with each other.

As described in claim 16,

The reflective polarizing element comprises a reflective layer including a liquid crystal and a phase difference layer for shifting a phase of a color light beam laminated and passing on the reflective layer by about a quarter wavelength. By projection optics of the substrate, or

As described in claim 17,

At least one of the plurality of polarization means selectively passes a predetermined linear polarization component having the predetermined polarization plane among the polarization components in the incident light beam toward the side where the color light beam is incident, and polarization components other than the linear polarization component. By the projection optical device of claim 13, having an absorption polarizing element that substantially absorbs or

As described in claim 18,

The absorption type polarizing element is provided by the projection optical apparatus according to claim 17, wherein the absorption light polarizing element is provided for the lowest illuminance among the color light beams separated by the color separation optical system, or

As described in claim 19,

The absorption type polarizing element is provided for a blue light beam by the projection optical device according to claim 17, or

As described in claim 20,

The projection optical apparatus according to any one of claims 13 to 19, further comprising a mask provided to block the stray light on an optical path of stray light that reaches the reflective polarizing element from a light source. By device, or

As described in claim 21,

The plurality of color light beams formed by the separation optical system include a first color light beam and a second color light beam,

The plurality of light valves include a first light valve acting on the first color light beam, and a second light valve acting on the second color light beam,

The fraudulent polarization means includes first polarization means acting on the first color light beam, and second polarization means acting on the second color light beam,

Of said first and second polarization means, at least a first polarization means comprises said reflective polarizing element,

The first polarization means and the second polarization means may include an unknown polarization plane in which the transmission axis of the second polarization means is reflected by the reflective polarization element in the first polarization means and is incident on the second polarization means. The projection optical device according to any one of claims 13 to 19, characterized in that it is formed so as to intersect, or

As described in claim 22,

The first polarization means and the second polarization means are formed so that the transmission axis of the first polarization means intersects the transmission axis of the second polarization means when the same direction of the passing light beam is compared. By the projection optics of claim 21, or

As described in claim 23,

When the first polarization means and the second polarization means compare the same direction of the passing light beam, the transmission axis of the first polarization means and the second transmission axis of the second piece and the means are at an angle of about 90 degrees. By projection optics as set forth in claim 21 or 22, characterized in that they are formed to intersect; or

As described in claim 24,

At least one of the first and second polarization means is a phase of stray light that is disposed in an optical path of stray light reflected by the reflective polarization element in the first polarization means and incident on the second polarization means. By a projection optics device as claimed in claim 21 comprising a phase change means for changing

As described in claim 25,

The phase shift means changes the phase of light passing by approximately half the wavelength, or by the projection optical device as set forth in claim 24, or

As described in claim 26,

The phase shifting means is included in either one of the first polarization means and the second polarization means.

As described in claim 27,

The phase shifting means may be first and second quarter wave retardation plates that respectively change the phase of light passing by about one quarter wavelength, and the first polarization means is the first quarter wave retardation plate. Wherein the second polarization means comprises the second quarter-wave retardation plate, or by the projection optical device as claimed in claim 24, or

As described in claim 28,

The phase change means may be a 1/3 wavelength retardation plate for changing the phase of light passing by about 1/3 wavelength and a 1/6 wavelength retardation plate for changing the phase of light passing by about 1/6 wavelength, respectively, The first polarization means includes one of the 1/3 wavelength retardation plate and the 1/6 wavelength retardation plate, and the second polarization means includes the other of the 1/3 wavelength retardation plate and the 1/6 wavelength retardation plate. By the projection optical device according to claim 24, or

As described in claim 29,

The first polarizing means includes an absorption type polarizing element on an optical path of the first color light beam and behind the reflective type polarizing element, and according to the projection optical device according to any one of claims 21 to 23. , or

As described in claim 30,

The absorption type polarizing element has a transmission axis substantially coincident with the transmission axis of the reflective polarization element, or according to the projection optical device as set forth in claim 29, or

As described in claim 31,

The first polarizing means further comprises a phase difference plate for changing a phase of light passing between the reflective polarizing element and the absorbing polarizing element, or according to the projection optical device according to claim 29, or

As described in claim 32,

The projection polarizing device according to any one of claims 21 to 23, wherein the second polarization means includes an absorption type polarization element on an optical path of the second color light beam and behind the reflective polarization element. , or

As described in claim 33,

The projection optical device according to claim 32, wherein the absorption polarizing element has a transmission axis substantially coincident with the transmission axis of the reflective polarization element, or

As described in claim 34,

The second polarizing means further comprises a phase changing means for changing a phase of light passing between the reflective polarizing element and the absorbing polarizing element, or according to the projection optical device according to claim 32, or

As described in claim 35,

One of the plurality of light valves has a polarization axis intersecting the transmission axis of the corresponding polarization means, by the projection optical device of claim 13, or

As described in claim 36,

The projection liquid crystal device according to claim 35, wherein the one liquid crystal light valve is driven in an inverted drive mode in which the driving mode of the other liquid crystal light valve is inverted.

As described in claim 37,

The reflective polarizing element constituting the first polarization means is formed by dispersing reflected light on its reflection surface to form an irregular shape, or according to the projection optical device according to claim 21, or

As described in claim 38,

The reflective polarization element constituting the first polarization means is formed by a projection optical device as set forth in claim 21, characterized in that to form a regular shape by dispersing the reflected light on the reflective surface.

As described in claim 39

The first polarization means and the second polarization means are present on the trajectory of each color light beam separated from each other by the same half mirror constituting the separation optical system,

Or by the projection optical apparatus of claims 21 to 26, characterized in that they are disposed adjacent to each other.

As described in claim 40,

A first phase change means and a second phase change means are disposed on an optical path of the first polarization means and the second polarization means, respectively, and the first phase change means and the second phase change means are provided with light passing through them. The projection optical apparatus according to any one of claims 21 to 23 and 39, wherein the first and second phase changes are respectively given to be added to each other so that the phase change is about 1/2 wavelength.

As described in claim 41,

The phase shift means is formed by being in close contact with the reflective polarizing element by the projection optical device according to any one of claims 24 to 28, 31, 34, 39, 40, or

As described in claim 42,

The retardation plate is formed between the reflective polarizing element and the absorbing polarizing element in close contact, and is formed by the projection optical device according to claim 31 or 34, or

As described in claim 43,

The reflective polarizing element is provided with a filter for blocking ultraviolet rays on the side from which the emitted light beam from the light source is incident, by the projection optical device according to any one of claims 13 to 42, or

As described in claim 44,

The filter is a projection optical device according to claim 43, wherein the filter is a multilayer reflective film and is an ultraviolet reflection filter that reflects ultraviolet rays.

As described in claim 45,

The filter is disposed in the optical path of the incident light, and is provided by a plurality of filter elements reflecting ultraviolet rays, respectively, by the projection optical device according to claim 43 or 44, or

As described in claim 46,

The projection optical device according to claim 45, wherein one filter element of the plurality of filter elements is disposed inclined with respect to the other filter element.

As described in claim 47,

The filter is formed by being in close contact with the first polarizing element by the projection optical device according to any one of claims 43 to 46, or

As described in claim 48,

With a light source,

A color separation optical system disposed in an optical path of the output light beam emitted from the light source, and separating the light into a plurality of color light beams;

A plurality of light valves arranged in one optical path of the plurality of color light beams, respectively, for spatially modulating the color light beams passing through the optical path to form a modulated color light beam;

A plurality of polarization means each inserted into an incident optical path of the color light beam incident on one of the plurality of light valves, and polarizing the color light beam passing through the incident light path on a predetermined polarization plane;

A projection optical apparatus comprising a projection optical system for projecting a synthesized light beam formed by synthesizing the modulated color light beam on a screen,

At least one of the plurality of polarizing means selectively passes a predetermined linear polarization component having the predetermined polarization plane among the polarization components in the incident color light beam, and substantially reflects polarization components other than the linear polarization component. By a projection optics device having a reflective polarizing element inclined with respect to an optical path of the incident color light beam, or

As described in claim 49,

The projection optical device according to claim 48, wherein the inclined reflective polarization element is set to an inclination angle at which the stray light in which the reflective polarization element is formed is deviated from the second light valve with respect to the optical path of the incident color light beam. or

As described in claim 50,

The reflective polarizing element is provided by a projection optical device as set forth in claim 48 or 49, characterized in that a filter for blocking ultraviolet rays is provided on the side from which the emitted light beam from the light source is incident.

As described in claim 51,

The filter is a multilayer film and is a UV reflecting filter that reflects ultraviolet rays.

As described in claim 52,

The projection optical device according to claim 50 or 51, wherein the filter is disposed in an optical path of the incident light and is a plurality of filter elements that respectively reflect ultraviolet rays, or

As described in claim 53,

The projection optical device according to claim 52, wherein one filter element of the plurality of filter elements is arranged to be inclined with respect to the other filter element.

As described in claim 54,

The filter is formed on the first polarizing element in close contact with the projection optical device according to any one of claims 50 to 53, or

As described in claim 55,

With a light source,

A plurality of condensing elements disposed in an optical path of the light beam emitted from the light source, each condensing element condensing the light beam;

Reflective polarized light which is arranged in each optical path of the light beam passing through the plurality of light collecting elements and selectively passes a polarization component having a predetermined flat surface, and reflects the polarization component having a polarization surface other than the predetermined polarization surface. Element,

A spatial modulation element disposed in an optical path of the passing light beam passing through the reflective polarization element and spatially modulating the passing light beam;

Reflecting means for reflecting in the direction of the spatial modulation element a reflected light beam which is formed in an optically ineffective region in which the light beam collected by the multi-condensing element does not reach and is a polarization component reflected by the reflective polarizing element;

By an optical display device disposed in an optical path of the reflected light beam and having polarization plane rotating means for rotating the polarization plane of the reflected light beam incident on the spatial modulation element; or

As described in claim 56,

The reflective polarizing element is formed by the optical display device according to claim 55, wherein the reflective light beam is formed to be inclined with respect to the optical axes of the plurality of light collecting elements so that the reflected light beam is incident on the reflecting means.

As described in claim 57,

The optical collecting device according to claim 52 or 56, wherein each condensing element is a convex lens, or

As described in claim 58,

Each of the light collecting elements is a cylindrical lens, or by the optical display device according to claim 52 or 56, or

59. The optical display device according to claim 58, wherein the cylindrical lens is formed asymmetrically on only one side of the optical axis, or

As described in claim 60,

The plurality of condensing elements are disposed so that the optical axis is inclined with respect to the optical path of the incident light, according to the scientific display device according to any one of claims 55 to 59, or

As described in claim 61,

The reflective polarizing element comprises a scattering layer for scattering the reflected light beam, by the optical display device according to any one of claims 55 to 60, or

As described in claim 62,

The optical element according to any one of claims 55 to 61, wherein an optical element for converting the light beam focused by the plurality of light collecting elements into substantially parallel light is provided between the reflective polarization element and the spatial modulation element. By the display device, or

As described in claim 63,

The said polarization plane rotating means is arrange | positioned in the optical path of the light beam reflected by the said reflection means, and is a phase difference compensating plate which changes about 1/2 wavelength of the phase of the light beam which passes, The any of Claims 55-62 characterized by the above-mentioned. By the optical display device according to the claim, or

As described in claim 64,

The said polarization plane rotating means is a phase difference compensating plate which changes the phase of the light beam which is arrange | positioned between the said reflection type polarizing element and the said reflection means about 1/4 wavelength, The any one of Claims 55-62 characterized by the above-mentioned. By the optical display device according to the claim, or

As described in claim 65,

64. The optical device according to claim 64, wherein the plurality of condensing elements form an integral optical member coupled to each other, and wherein the reflective polarizing element and the phase difference compensator extend in succession, respectively, covering an area corresponding to the optical member. By the display device, or

As described in claim 66,

Each of the plurality of light collecting elements is formed on a side wall, and a reflection film is formed on the side wall, by the optical display device according to any one of claims 55 to 63, or

As described in claim 67,

The optical display device according to any one of claims 55 to 66, wherein the optical display device further comprises a projection optical system for projecting a light beam passing through the spatial modulation element on a screen to form a projection optical device. or

As described in claim 68,

The plurality of condensing elements, the reflective polarizing element, the reflecting means, and the polarizing plane rotating means form an optical processing device for converting incident light into a polarized light beam having a polarizing plane in which substantially all energy is desired; The projection optical device has a color separation optical system for separating the light beam formed by the light source into a plurality of color light beams, the spatial modulating element is provided for each of the plurality of color light beams, and the light processing device comprises: The optical display device according to claim 67, which is provided between the light processing devices.

As described in claim 69,

The plurality of condensing elements, the reflective polarizing element, the reflecting means, and the polarizing plane rotating means form an optical processing device for converting incident light into a polarized light beam having a polarizing plane in which substantially all energy is desired; The projection optical apparatus has a color separation optical system for separating the light beam formed by the light source into a plurality of color light beams, the spatial modulation element is provided for each of the plurality of color light beams, and the light processing apparatus is provided with the plurality of light processing apparatuses. By an optical display device as set forth in claim 67, characterized in that it is provided for each of the spatial modulation elements, or

As described in claim 70,

The optical display device is a direct-view display device, characterized by the optical display device according to claims 55 to 66, or

As described in claim 71,

The reflective polarizing element is provided with an optical display device according to claim 55 or 70, characterized in that a filter for blocking ultraviolet rays is provided on the side from which the emitted light beam from the light source is incident.

As described in claim 72,

The optical filter according to claim 71, wherein the filter is a multilayer film and is an ultraviolet reflecting filter reflecting ultraviolet rays.

As described in claim 73,

The filter is disposed in the optical path of the incident light, and is further provided by the optical display device according to claim 71 or 72, which is a plurality of filter elements each reflecting ultraviolet rays.

As described in claim 74,

The optical display device according to claim 73, wherein one filter element of the plurality of filter elements is disposed inclined with respect to the other filter element.

As described in claim 75,

The filter is solved by the optical display device according to any one of claims 71 to 74, wherein the filter is formed in close contact with the first polarization element.

According to the polarizing device of the present invention, by disposing the reflective polarizing element in front of the absorbing polarizing element, unnecessary polarization energy incident on the absorbing polarizing element can be substantially reduced, and as a result, the polarizing device of the present invention has a high output. A projection optical device using a light source can be used without a special cooling mechanism. Further, by arranging the absorbing polarizing element behind the reflective polarizing element, even if the polarizing property of the reflective polarizing element is insufficient, it is possible to obtain linearly polarized light having excellent linearity by the absorbing polarizing element.

In addition, when forming a projection optical apparatus using the polarizing apparatus of this invention, an absorption type polarizing element can be used for the color component with a small amount of light, and a reflective polarizing element can be used for the color component with a large amount of light. That is, the present invention makes it possible to appropriately design the projection optical device.

In the case of forming a projection optical device using the polarizing device of the present invention, the polarization direction of each polarized optical system is determined in consideration of the polarization direction of the unnecessary polarization component reflected by the reflective polarization element, thereby reflecting polarized light. It becomes possible to substantially eliminate the effects of stray light formed of the element.

In addition, in the present invention, by rotating the polarization plane of the unnecessary polarization component reflected by the reflective polarization element, the light beam formed by the light source can use substantially all of the energy for the formation of the necessary polarization component, thereby significantly improving the display quality. have.

Further, by forming a UV cut filter on the light source side in front of the reflective polarizing element, deterioration of the reflective polarizing element generated by the ultraviolet rays emitted from the light source can be avoided.

(Example 1)

1 shows a projection optical apparatus 10 as a first embodiment of the present invention. In the order in which the light proceeds, the polarizing device 13 which enters the metal halide lamp 11, the natural light 12 from the metal halide lamp 11, and the planar polarization 14 which has transmitted through the polarizing device 13. ), The light valve 15 into which the light is incident, the analyzer 16 through which the plane polarization transmitted through the light valve 15 is incident, and the light 17 through the analyzer 16 are transmitted onto the screen 18. It has a projection lens 19 for projecting. The wattage of the metal halide lamp 11 is higher than the conventional wattage, for example, 350W. In FIG. 1, the X-axis is horizontal and the Y-axis is vertical and orthogonal. The Z axis coincides with the optical axis 10a of the projection optical device 10.

The light valve 15 is a liquid crystal panel in which a liquid crystal layer, such as a twisted nematic liquid crystal or a vertical alignment mode liquid crystal, is enclosed between a pair of glass substrates. When the voltage is not applied, the light valve 15 rotates a vibration plane of polarized light by 90 degrees. It does not rotate the vibrating plane of polarization.

The polarizer 13 is composed of the first polarization element 20 located on the metal halide lamp 11 side and the second polarization element 21 located on the light valve 15 side, and is the same as one polarizer. Are treated.

The first polarization element 20 has a transmission axis 22 and a reflection axis 23 that are orthogonal to the reflection type. The structure of the 1st polarizing element 20 is mentioned later. The second polarization recess 21 has a transmission axis 24 and an absorption axis 25 orthogonal to the absorption type. The second polarization element 21 has a configuration in which oxo-based molecules are dispersed, and the degree of polarization is high. The first polarization element 20 and the second polarization element 21 are arranged so that their transmission axes 22 and 24 coincide in the X-axis direction together. The 1st polarization element 20 is equipped in order to reflect the Y-polarization 31 mentioned later, and not to heat the polarizing apparatus 13 (2nd polarization element 21). In other words, the second polarization element 21 absorbs the Y polarization remaining without being reflected by the first polarization element 20 to extract the X polarization 30 having a high degree of polarization. Equipped to get

In addition, the polarizing device 13 has a configuration in which a plurality of first polarization elements 20 are provided in parallel, or a configuration in which a plurality of second polarization elements 21 are provided in parallel, or a first polarization element 20 and a second polarization element ( 21) may be provided with a plurality of components side by side.

The analyzer 16 has an orthogonal transmission axis 26 and an absorption axis 27. The analyzer 6 arrange | positions the transmission axis 26 to the direction toward the Y-axis direction. The first polarization element 20 and the second polarization element 21 and the analyzer 16 may include the transmission axes 22 and 24 of the first polarization element 20 and the second polarization element 21 and the analyzer. The transmission axis 26 of (16) is in an orthogonal positional relationship.

The natural light 12 from the meta halide lamp 11 is composed of a polarized light (hereinafter referred to as X polarization) 30 as the vibration plane and a polarized light (hereinafter referred to as Y polarization) 31 as the vibration plane YZ plane. I can think of it.

The analyzer 16 and the polarizing device 13 are arrange | positioned as mentioned above, and the light valve 15 rotates the oscillation surface of polarization 90 degrees, when voltage is not applied, and does not rotate the oscillation surface of polarization when voltage is applied. Therefore, the necessary polarization required in the light valve 15 is X polarization 30, and the unnecessary unnecessary polarization in the light valve 15 is Y polarization 31. Necessary polarization means a polarization necessary for forming an image on the screen 18. Unnecessary polarization means the polarization which degrades the quality of the image on the screen 18. FIG.

Next, the operation of the projection optical device 10 will be described.

Natural light 12 is incident on the polarizing device 13 from the metal halide lamp 11. The natural light 12 first enters the first polarization element 20, and the Y polarization 31 is reflected as indicated by reference numeral 31a, so that only the X polarization 30 passes through the first polarization element 20. The polarized light 32 transmitted through the first polarized light element 20 includes the small Y polarized light remaining in the X polarized light 30 without being reflected by the first polarized light element 20. This polarized light 22 is then: Y polarized light is absorbed by the second polarization element 21 and only the X polarization is projected, where the transmission axis 24 of the second polarization element 21 is the transmission axis 22 of the first polarization element 20. X polarization transmits without attenuating the second polarization element 21.

The polarized light (necessary polarization) 14 transmitted through the polarizing device 13 enters the light valve 15, and when the voltage is not applied, the oscillating surface of the polarized light is rotated by 90 degrees, becomes the polarized light indicated by reference numeral 33, and is a voltage. Visible light transmits in the state of the polarization shown by reference numeral 34 without rotating the oscillating surface of the polarization. The polarization 33 passes through the analyzer 16 and is projected onto the screen 18 by the projection lens 19. Polarized light 34 may not penetrate the analyzer 16. In this way, the transmission and non-transmission of the light are controlled by applying or not applying the voltage to the light valve 15, the light is modulated, and an image is displayed on the screen 18.

Here, the characteristic of the projection optical apparatus 10 (polarizing device 13) is demonstrated.

Since the first polarization element 20 does not absorb and reflect the Y polarization 31, the first polarization element may be used even if the 350W metal halide lamp 11 of higher wattage is used or if no special cooling device is provided. The rise of the temperature of (20) is suppressed and does not rise above the use limit temperature.

Looking at the second polarization element 21, and absorbs the remaining Y polarization 31 is not reflected from the first polarization element (20). However, as will be described later, most of the Y polarization 31 is reflected by the first polarization element 20, and the Y polarization 31 absorbed by the second polarization element 21 is small, so that the first polarization element 21 is Almost no fever Therefore, even if the 350W metal halide lamp 11 of higher wattage is used or a special cooling device is not provided, the rise of the temperature of the second polarization element 21 is suppressed and does not rise above the service temperature. .

Therefore, the polarizing device 13 is unlikely to generate heat significantly more conventionally. Thereby, the 350W metal halide lamp 11 can be used without installing a special cooling device, and the projection optical device 10 is a structure which does not have a special cooling device built-in. A display screen of lumen roughness can be formed.

In addition, by providing the second polarization element 21, the Y polarized light remaining without being reflected by the first polarization element 20 is absorbed, and the X polarization 30 having high polarization degree is taken out, and the projection optical device 10 A display screen with a large contrast can be formed.

Next, the structure and operation of the first polarization element 20 will be described.

As shown in FIG. 2 (a), the first polarization element 20 includes a cholesteric liquid crystal layer 41 and a 1 / 4λ plate 42 stacked on a glass substrate 40. Structure. The first polarization element 20 is provided in a direction in which the cholesteric liquid crystal layer 41 is located on the metal halide lamp 11 side, and the 1/4 lambda plate 42 is located on the light valve 15 side.

2 (b) shows the action of the first polarization element 20. The natural light 12 can be considered to be formed of the circularly polarized light 45 of the right rotation and the circularly polarized light 46 of the left rotation. The cholesteric liquid crystal layer 41 reflects the circularly polarized light 45 of right rotation and transmits the circularly flat light 46 of left rotation. The left circularly polarized light 46 that has passed through passes through the 1/4? Plate 42 to form X polarized light 32 which is linearly polarized light.

As shown in FIG. 2A, since the first polarization element 20 has a structure in which a cholesteric liquid crystal layer 41 and a 1/4 lambda plate 42 are stacked on a glass substrate 40, t1) is thin. Thus, by using the first polarization element 20 of the structure shown in Fig. 2A, the polarizing device 13 is compact.

3 shows a modification of the first polarization element. The first polarizing element 20A is formed by laminating a 1/4 lambda plate 43, a cholesteric liquid crystal layer 41, and a 1/4 lambda plate 42 on a glass substrate 40. Since the one polarizing element 20A has a configuration having 1/4 lambda plates 42 and 43 on both sides of the Cholesteric liquid crystal layer 41, the direction shown in FIG. 3 (a) and the direction shown in FIG. 3 (b) It can be used in either direction. In other words, the second polarization element 20A has no directivity.

Next, the characteristics of the first polarizing element 20, the first polarizing element 21, and the polarizing device 13 will be described.

4 to 7 is a notation for one polarization, and according to this notation, the light emitted from the metal halide lamp 11 is a sum of two orthogonal polarizations, that is, 200%.

4 and 5 show the characteristics of the first polarization element 20, and FIG. 6 shows the characteristics of the second polarization element 21. 7 shows the characteristics of the polarizer 13.

In FIG. 4, the line I represents the wavelength dependency of the transmittance ｛Tla (λ): ≒ 90%｝ of the required polarization (X polarization) of the first polarization element 20, and the line II represents the unnecessary polarization (Y polarization). The wavelength dependence of transmittance ｛Tlb (λ): ≒ 5%｝ is shown.

Line III in FIG. 5 shows the reflectance wavelength dependence of the unnecessary polarization (Y polarization) of the first polarization element 20. In Fig. 6, line IV shows a wavelength dependency of transmittance ｛T2b (λ): ≒ 95%｝ of polarization (X polarization) for which the second polarization element 21 is required, and line V shows transmittance of unnecessary polarization (Y polarization). Represents a wavelength dependency of? T2b (?):? 0.5% ?. 6, it can be seen that the second polarization element 21 has a high degree of polarization.

Of the light emitted from the polarizing device 13, the required polarization (X polarization) is a product for each wavelength of the transmittance shown by the line I of FIG. 4 and the transmittance shown by the line IV of FIG. 6 "= T1a (λ) × T2a (λ): # 85.5%], as shown by the line VI in FIG. 7, and emitted almost without attenuation. Unnecessary polarization (Y polarization) is equally multiplied by the respective wavelengths of the transmittance shown by the line II of FIG. 4 and the transmittance shown by the line V of FIG. 6 "= T1b (λ) x T2b (λ):? 0.25% It is displayed as shown by the line 중 in FIG. 7 and almost disappears.

In FIG. 7, it can be seen that the polarizer 123 has a high degree of polarization.

In addition, the amount of light absorbed by the polarizing device 13 and converted into heat is only the unnecessary polarization component (Y polarization) absorbed by the second polarization element 21, that is, T1b (λ) × (100% -T2b (λ)). : It becomes 5.0% and hardly generates heat.

As described above, in the first polarizing element 20 (reflective type), part of the unnecessary polarization (several%) and part of the necessary polarization are absorbed. Also in the second polarization element 21 (absorption type), part of the required polarized light (several%) is absorbed, and part of the unnecessary polarized light is transmitted (several%).

8 (a) shows a more detailed configuration of the first polarization element 20.

Referring to FIG. 8 (a), a polarization element 20 is formed on the glass substrate 40, and passes only one circularly polarized component, for example, a left-rotated component, to the blue light component of the incident light, and the other circularly polarized light. A component, for example, is formed on the first cholesteric liquid crystal layer 41B and the cholesteric liquid crystal layer 41B, which reflects the right-turn component, and passes only the left-turn component to the green light component of the incident light. A second cholesterol formed on the second cholesteric liquid crystal layer 41G and the cholesteric liquid crystal layer 41G to reflect, and passing only the left turn component in the same manner with respect to the red light component of the incident light and reflecting the right turn component. The liquid crystal layer 41R is included, and the λ / 4 plate 42 is formed on the cholesteric liquid crystal layer 41R.

In the polarization element 20 having such a configuration, since the right-turn component is reflected and removed for each of the three primary colors of red, blue, and green, the linearly polarized light components of red, blue, and green are formed on the exit side of the λ / 4 plate 42. Obtained.

FIG. 8B shows the wavelength dependence of the reflectance with respect to the right-turn light component in the cholesteric liquid crystal layers 41B, 41G, and 41R.

Referring to FIG. 8B, the line B is for the liquid crystal layer 41B, the line G is for the liquid crystal layer 41G, and the line R is for the liquid crystal layer 41R. However, it can be seen that each liquid crystal layer exhibits a reflectance close to 100% in the corresponding wavelength range. Referring to FIG. 6, that is, by stacking the liquid crystal layers 41B, 41B, and 41R as shown in FIG. 8A, it is possible to almost completely reflect and remove the right-turning light component in the wavelength range of 400 nm to 700 nm. Able to know.

FIG. 9A shows a variation of the polarization element 20 ₁ of FIG. 8A.

Referring to Fig. 9A, the illustrated polarizing element 20 has a configuration in which the λ / 4 plate 42 is disposed between the glass substrate 40 and the Cholesteric liquid crystal layer 41B, and thus the substrate Enter 40. Incident light including the right-turn and left-turn circularly polarized light components first rotates the polarization plane in the λ / 4 plate 42 and enters the liquid crystal layer stack which becomes the cholesteric liquid crystal layers 41B to 41R. In this case, the liquid crystal layer 41B reflects the right-turning circularly polarized light component among the light components of the blue wavelength constituting the incident light, and converts the left-turning circularly polarized light component into linearly polarized light. Similarly, the liquid crystal layer 41G reflects the incident light passing through the liquid crystal layer 41B to the right-turning circularly polarized light component among the light components of the green wavelength, thereby converting the left-turning circularly polarized light component into linearly polarized light. Further, the liquid crystal layer 41R reflects the right rotating circularly polarized light component among the red wavelength light components constituting incident light passing through the liquid crystal layer 41G, and converts the left rotating circularly polarized light component into linearly polarized light.

FIG. 9B shows the relationship between the conversion efficiency and the wavelength when the circularly polarized light is converted into linearly polarized light for each of the liquid crystal layers 41B to 41R of FIG. 9A.

Referring to FIG. 9 (b), similarly to FIG. 8 (b), each of the cholesteric liquid crystal layers 41B to 41R exhibits conversion efficiency close to 100% at each wavelength. In other words, the polarization element 20 ₁ reflects the circularly polarized light component of the right rotation of the incident light in the natural circularly polarized state incident on the substrate 20 with a reflectance close to 100% over a wide wavelength range, and at the same time the left rotating circle of the incident light. The polarization component is efficiently converted into the desired linearly polarized light.

10 shows the configuration of another polarization element 20 ₂ .

Referring to FIG. 10, the polarization element 20 ₂ has a configuration in which a stack of a Cholesteric liquid crystal layer is formed on the glass substrate 40 like the polarization element 20 ₁ , but in this embodiment, the substrate 40 is formed. ) And the cholesteric liquid crystal layer 41B, a λ / 4 plate 41B which acts on blue light and rotates the polarization plane is formed, and the liquid crystal layer 41B and the cholesteric liquid crystal layer 41G thereon. Is formed between?) And 42G to act on green light and rotate the polarization plane. Further, between the liquid crystal layer 41G and the cholesteric liquid crystal layer 41R thereon, a λ / 4 plate 42R which acts on red light and rotates the polarization plane is formed.

Also in this structure, the right-turning circularly polarized light component is selectively reflected with respect to the wavelength of each color in incident light, and the linearly polarized light from which the left-rotating circularly polarized light component originates is obtained on the emission side of the liquid crystal layer 41R.

11 shows a configuration of another polarization element 20 ₃ .

In the embodiment of FIG. 11, the glass substrate 40 used in the foregoing polarizing elements 20, 20 ₁ to 20 ₂ is omitted, and the structure in which the droplet 42D of the cholesteric liquid crystal is dispersed in the resin matrix 40F. Has Even in such a configuration, one circularly polarized light component of the incident light is selectively reflected, and the other circularly polarized light component passes.

As described later, the polarizing element 20 ₃ is flexible and can be used by being attached to other optical elements as necessary.

Example 2

Next, a projection optical device 10A according to the second embodiment of the present invention will be described with reference to FIG.

The projection optical device 10A is the same as the projection optical device 10 shown in FIG. 1 except for the polarizing device 13A. In FIG. 12, the same code | symbol is attached | subjected to the same component as the component shown in FIG.

The polarizing device 13A is a structure in which the second polarizing element 21 is adhered to the light valve 15 by an adhesive made of an acrylic ester copolymer.

According to this configuration, the surface reflection of about 4% caused by the refractive index difference between the glass and the air on the surface 50 opposite to the second polarization element 21 of the light valve 50 in FIG. There is no 2-4% surface reflection occurring on the surface 51 opposite the light valve 50 of the polarizing element 21, and the polarizing device 13A is compared with the polarizing device 13 in FIG. 1. The transmittance of the required polarized light (X polarization) is improved by that amount. As a result, the projection optical apparatus 10A can form a display screen with a slightly higher illuminance than the projection optical apparatus 10 in FIG. 1.

In addition, since the second polarization element 21 does not generate heat as described above, even if it adheres to the light valve 50, no problem occurs.

In addition, when the second polarization element 21 itself is a film or the like (see FIG. 11), distortion is likely to occur, but the second polarization element 21 is adhered to the light valve 50 so that distortion does not occur.

In addition, the object to which the second polarizing element 21 is bonded is a light valve 50 which is an existing component, and the glass substrate used for bonding the second polarizing element 21 becomes unnecessary, and the number of parts can be reduced. .

Example 3

Next, the projection optical device 60 according to the third embodiment of the present invention will be described with reference to FIG.

The projection optical device 60 is the same as the projection optical device 10 shown in FIG. 1 except for the polarizing device 61. In FIG. 13, the same code | symbol is attached | subjected to the component same as the component shown in FIG. 1, and description of the part which operates like FIG. 1 is abbreviate | omitted.

The polarizing device 61 includes a first polarization element 20 positioned on the metal halide lamp 11 side, a second polarization element 21 positioned on the light valve 15 side, and a first polarization element 20. It becomes the flat convex condenser lens 62 located in the metal halide lamp 11 side, and is handled similarly to one polarizer.

Natural light 12 from the metal halide lamp 11 is parallel to the optical axis 60a and enters the polarizing device 61. The natural light 12 is first refracted by the condenser lens 62 and collected to face the projection lens 19, and is then inclined to the first polarization element 20 to be incident. The Y polarization 31 is reflected as indicated by the numeral 31b, is refracted by the condenser lens 62 to become the Y polarization 31c, and is directed from the metal halide lamp 11 to the light shielding plate 63.

Since the reflected Y polarization 31c does not return to the metal halide lamp 11, the metal halide lamp 11 is unnecessarily heated by the reflected Y polarization 31c, and thus the metal halide lamp 11 The lifespan of) does not become unduly short. The reflected Y polarization 31c reaches the light shielding plate 62 and is absorbed here.

Example 4

Next, a projection optical device 60A according to the fourth embodiment of the present invention will be described with reference to FIG.

The projection optical device 60A is the same as the projection optical device 60 shown in FIG. 9 except for the polarizing device 61A. In Fig. 14, the same components as those shown in Fig. 13 are assigned the same reference numerals.

The polarizing device 61A is a structure in which the first polarizing element 20 is bonded to the convex condenser lens 62 by an adhesive made of an acrylic ester copolymer.

According to this configuration, the surface reflection of about 4% and the first polarization generated by the refractive index difference between the glass and the air on the surface 52 opposite the first polarization element 20 of the condenser lens 62 in FIG. There is no 2-4% surface reflection occurring in the surface 53 opposite to the light valve 50 of the element 21, so that the polarizing device 61A is as much as the polarizing device 61 in FIG. The transmittance of the required polarized light (X polarization) is improved. As a result, the projection optical device 60A can form a display screen with slightly higher illuminance than the projection optical device 10 in FIG. 1.

In addition, as described above, since the first polarization element 20 does not generate heat or does not generate much heat, the problem does not occur even if it is adhered to the condenser lens 62.

In addition, when the first polarizing element 20 itself is thin with a film or the like, even if distortion is easily generated, the first polarizing element 20 is adhered to the condenser lens 62 so that no distortion or the like occurs. In addition, the object to which the first polarizing element 20 is adhered is a condenser lens 62 which is an existing component, and the glass substrate required for bonding the first polarizing element 20 is unnecessary, so that the number of parts can be reduced.

Example 5

Next, a projection optical device 70 according to the fifth embodiment of the present invention will be described with reference to FIG.

The projection optical device 70 includes a 350W metal halide lamp 11, a dichroic mirror 71 that transmits light of 500 nm or less and reflects other light, and light of 600 nm or more. The dichroic mirror 72, the reflecting mirror 73, and the polarizing devices 61R, 61G, and 61B and the light valves 15R, 15G, and 15B of the structure shown in FIG. And the dichroic mirror 74 and the reflecting mirror 75 that transmit light of 500 nm or less with the analyzers 16R, 16G, and 16B and reflect other light, and transmit light of 500 nm to 600 nm, The dichroic mirror 76 which reflects other light and the projection lens 19 which enlarges and projects the image of the light valve on the screen 18 are provided.

The polarizing devices 61R, 61G, and 61B have condenser lenses 62R, 62G, and 62B, first polarizing elements 20R, 20G, and 20B of type reflecting unnecessary polarization, and second polarizing elements of type absorbing unnecessary polarization. It is comprised by combining (21R, 21G, 21B).

The white light W emitted from the metal halide lamp 11 is colored by R light having a wavelength of 600 nm or more, G light having a wavelength of 500 to 600 nm, and B light having a wavelength of 500 nm or less by the dichroic mirrors 71 and 72. After separation, they are modulated by light valves of each color. Thereafter, color is synthesized by the dichroic mirrors 74 and 76, and then magnified and projected onto the screen 18 by the projection lens 19.

The R light passes through the polarizing device 61R. Since the light amount of the R light is 1/3 of the light amount of the white light W emitted from the metal halide lamp 11, and the light absorption amount of the second polarization element 21R is small, the second polarization element 21R is almost Not heated The first polarization element 20R is hardly heated because it is of reflection type.

The G light passes through the polarizing device 61G. For the above reason, the second polarizing element 21G and the first polarizing element 20G are hardly heated. The B light passes through the polarizing device 61B. For the above reason, the second polarization element 21B and the first polarization element 20B are hardly heated.

Instead of the polarizing devices 61R, 61G, and 61B, a configuration in which the polarizing device 13 having the configuration shown in FIG. 1 is provided may be provided.

Example 6

Next, a projection optical device 70A according to the sixth embodiment of the present invention will be described with reference to FIG.

The projection optical apparatus 70A is a structure which changed the polarizing apparatus 61B into the polarizing apparatus 80B among the three polarizing apparatus 61R, 61G, 61B in FIG. In FIG. 16, the same code | symbol is attached | subjected to the component same as the component shown in FIG. 11, and the description is abbreviate | omitted. As shown in FIG. 17, the polarizing device 80B sequentially turns the condenser lens 62B, the first second polarizing element 21-1, and the second second from the metal halide lamp 11 side. It is a structure which has the polarizing element 21-2.

The first second polarization element 21-1 and the second second polarization element 21-2 are both absorption type and have orthogonal transmission axis 24 and absorption axis 25. In other words, the polarizing device 80B is an absorption type polarizing device which is different from the polarizing device 61R or 61G, and is absent in the reflective polarizing device. The first second polarization element 21-1 is made of a resin in which dye-based molecules that absorb 50% of unnecessary polarization and transmit nearly 100% of the necessary polarization are dispersed. The second second polarization element 21-2 is made of a resin in which dye-based molecules that absorb almost 100% of unnecessary polarization and transmit nearly 100% of the necessary polarization are dispersed. The first second polarization element 21-1 and the second second polarization element 21-2 are in a state where the respective transmission axes 24 and 24 are aligned with each other in the X-axis direction and coincide with each other. Side by side.

The transmittance characteristic with respect to the required polarization (X polarization) of the polarizing device 80B is the square for each wavelength of the transmittance shown by the line IV of FIG. 5, and is shown by the line VII in FIG.

Comparing the line X with the line VI in FIG. 7 (indicated by the broken line in FIG. 15), the transmittance of the polarizer 80B is a% higher in the wavelength range of about 500 nm or more than the transmittance of the polarizers 13 and 61. In addition, the wavelength is b% high in the range of about 400-500 nm. That is ba. The a% higher is due to line 1 in FIG. 19 being a1% higher than line I. FIG. The higher b% is due to the slightly lower wavelength of the portion where the line IV is rising than the wavelength of the portion where the line I is rising.

Regarding B light having a wavelength of 500 nm or less, the transmittance with respect to the required polarization (X polarization) of the polarizing device 80B is slightly higher than the transmission with respect to the required polarization (X polarization) of the polarizing device 61B in FIG. 15. Thus, the projection optics 70A can project an image on the screen 18 which is slightly brighter than the projection optics 70 of FIG. 15.

Moreover, according to the structure of equipping a cooling apparatus, you may make it the structure which changed the polarizing apparatus 61R, 61G in FIG. 15 into the polarizing apparatus of the same structure as the polarizing apparatus 80B shown in FIG. According to the configuration in which the polarizing device 61R is changed to a polarizing device having the same configuration as that of the polarizing device 80B shown in FIG. 17, an image with slightly light R light can be projected compared to the projection optical device 70 of FIG. 15. have. According to the configuration in which the polarizing device 61G is changed to a polarizing device having the same configuration as that of the polarizing device 80B shown in FIG. 17, an image with slightly lighter G light can be projected than the projection optical device 70 of FIG. 15.

In general, the absorption type polarizing device has a higher degree of polarization obtained than the reflection type polarizing device. Therefore, in the present invention, in the polarizing device 13 or the polarizing devices 61G and 61R of FIG. 16, the absorption type polarizing device is absorbed behind the reflective polarizer 20. The type polarizer 21 is arranged so that the polarization state of the emitted light beam emitted from the polarizer can be further adjusted. In addition, the absorbing polarizer 21 is used for light components having a small amount of light such as blue light (B), while the reflective polarizer and absorbing polarizer are used in sequence for a light component having a large amount of light. The display can be realized.

Example 7

Next, a projection optical device 90 as a seventh embodiment of the present invention will be described with reference to FIG. In FIG. 20, the same code | symbol is attached | subjected to the part same as the structural part shown in FIG. 1 and FIG.

The projection optics 90 includes 350W metal halide lamp 11, polarizer 13, polarizer 100, light valves 15-1, 15-2, analyzers 16-1, 16-2. ), The color separation optical system 91 is disposed between the metal halide lamp 11, the polarizing device 13, and the polarizing device 100 in the optical system including the projection lenses 19-1 and 19-2. The color separation optical system 91 is a dichroic mirror 92 and a mirror 93. The dichroic mirror 92 transmits light having a wavelength of 600 nm or less, and otherwise reflects it. The polarizer 13 is composed of a first polarization element 20 of a type that reflects unnecessary polarization and a second polarization element 21 of a type that absorbs unnecessary polarization. In addition, the polarizing device 100 is a state in which the first second polarization element 21 and the second second polarization element 21-2 are aligned with each other in the X axis direction. It is a side by side configuration. The polarizing apparatus 100 has a transmission characteristic shown by the line X in FIG.

The white light W emitted from the metal halide lamp 11 goes straight through by the dichroic mirror 92 and the light A of 600 nm or less, and the light B of 600 nm or more is reflected and bent at right angles. The light B of 600 nm or more is changed in direction by the mirror 93. Thereafter, the light ray B is incident on the polarizing apparatus 100, and 50% of the unnecessary polarizations are absorbed by the first second polarization element 21-1 to turn into heat. Almost 100% of the required polarization and 50% of the undesired polarization emitted from the first second polarization element 21-1 are incident on the second second polarization element 21-2, and the necessary polarization is transmitted. And unnecessary polarizations are all absorbed. The absorbed unnecessary polarization is converted into heat in the second second polarization element 21-2. Only the light exiting the second second polarization element 21-2 and the required polarization are irradiated and modulated by the light valve 15-2, and then the projection lens 19 passes through the analyzer 16-2. Projected onto screen 18 by -2).

Similarly, the light ray A is incident on the first polarization element 20 of the polarizing device 13, and almost 100% of the unnecessary polarization is reflected in the dichroic mirror 92 direction, and the necessary polarization is projected. The necessary polarization exiting the first polarization element 20 is incident on the second polarization element 21, all of the remaining unnecessary polarization is absorbed, and the necessary polarization is transmitted. The necessary polarization exiting the second polarization element 21 is irradiated with the light valve 15-1, and after being modulated, passes through the analyzer 16-1, and the screen 18 by the projection lens 19-1. Projected onto. An image is formed on the screen 18 by the projection from the projection lens 19-2 and the projection from the projection lens 19-1.

At this time, the polarizing device 100 equally absorbs half of the light of 600 nm or more light, that is, the total amount of light, into two second polarizing elements 21-1 and 21-2, and converts them into heat. However, if the total light amount of 400 nm to 700 nm is 100%, the light beam B is 600 nm or more light, the light amount is 1/3, the unnecessary polarization is 1/2 of this light amount, and the amount of light absorbed by each polarization element is 1/2 of the amount. For this reason, heat generation at each polarizing element is not a problem thermally at 1/12 of the total amount of light. Moreover, in the piece and element of the type which reflects the unnecessary polarization like the polarization element 20 of the polarizing device 13, the transmittance of the required polarization is about 85%, and the combination of the transmittance of the required polarization of the polarization element 21 by 90% Although the transmittance of the required polarization of the phosphor polarizer 13 is about 77%, in the polarizer 100 which is a combination of the polarization element 21-1 and the polarization element 21-2, the transmittance of the required polarization of each polarization element Since it is about 90%, the transmittance | permeability will be about 81%, and higher transmittance | permeability can be expected than the polarizing device 13.

As in this embodiment, a combination of polarizing elements of a type that absorbs unnecessary polarization is used for the polarizing device 100 for light rays which are not particularly troublesome thermally. By using a combination of polarizing elements of the type that reflect unnecessarily polarized light, a high transmittance optical projection device 90 can be realized. The thermally troublesome light rays here mean wavelength components having a large amount of light, and correspond to the spectrum of red (R) to green (G) in the actual liquid crystal display device. On the other hand, even if an absorption type polarization element is used in a spectral component with a small amount of light such as blue light (B), the heat generation of the polarization element is not preferable but it is not a big problem. Therefore, by using an absorption type polarization element, With respect to light, it is possible to obtain excellent linearly polarized light that cuts off a circular or elliptic polarization component.

In the above, the example of changing the polarizing device by selecting by the amount of light of the light beam has been described, but the same effect can be expected even if the polarizing device is changed due to the difference in the cooling capacity generated from the positional relationship of the cooling fan.

Example 8

Next, the projection optical apparatus according to the eighth embodiment of the present invention will be described with reference to Figs. 21 (a) and (b). However, the same reference numerals are attached to the above-described parts, and description thereof is omitted.

Referring to Fig. 21A, the projection optical apparatus according to the present embodiment has the same configuration as that shown in the block diagram of Fig. 15 on the block diagram of Fig. 21A, but the polarizing devices 61G and 61R of Fig. 15 are shown. Instead of using 61B), the polarizers 61G ', 61R', 61B 'using the reflective polarizer having the configuration shown in Fig. 21B are used.

Referring to Fig. 21 (b), the reflective polarizer, for example 20G ', forms a λ / 4 plate 42G of green light on the substrate 40 and acts on the green light thereon. It has a configuration in which only the side 42G is formed. The reflective polarizers 20R 'and 20B' also have the same configuration.

In a configuration in which white light from the light source shown in Fig. 21A is decomposed into three primary colors of RGB by a dichroic mirror, and is changed after each path, the cholesteric liquid crystal as shown in Fig. 8A is synthesized. The structure which laminated | stacked the layers 41B-41R is unnecessary, and the structure of polarizing device 61G ', 61R', 61B 'is simplified.

Example 9

By the way, in the projection optical apparatus of the present invention, since a reflective polarizing element is used for the liquid crystal light valve, a part of the strong light emitted from the high luminance light source 11 is reflected by such a polarizing element and becomes a stray light. When the stray light reaches the screen, the image quality of the displayed image is deteriorated. In the conventional projection optical apparatus, the reflection type is not used for the polarizing element, and the luminance of the light source is also relatively low, so the problem of stray light is not so serious. However, in the projection optical device of the present invention, it is preferable to take countermeasures for blocking such stray light.

FIG. 22 is a diagram illustrating generation of stray light in the full-color projection optical device of FIG. 15, 16, or 21, and FIG. 23 is an enlarged view of a portion of FIG. 22 in detail. However, the same reference numerals are attached to the above-described parts, and description is omitted.

Referring to FIGS. 22 and 23, when a part of the natural light inclined from the light source 11 is incident as the stray light L under the condenser lens 62R, the stray light L is the liquid crystal by the condenser lens 62r. It is bent in the direction of the light valve 15R and enters the reflective polarizing element 20R. The polarizing element 20R has a transmission axis indicated by an arrow in FIGS. 22 and 23, and the transmission axis of the absorption type polarizing element 21R and the orientation of the liquid crystal light valve 15R are determined as indicated by the arrow in accordance with this transmission axis. It is. In addition, said "direction" means the orientation direction of the molecular orientation film carried by the incident side board | substrate among a pair of board | substrates which sandwich a liquid crystal layer here. Thus, the incident light L is reflected by the polarization element 20R, and stray light L 'is formed, which is linearly polarized light having a polarization plane indicated by an arrow. However, as shown in Fig. 21B, the polarizing element 20R has a configuration in which a 1/4 lambda plate 42R is formed on the incidence side and the cholesteric liquid crystal layer 41R is arranged on the corner side thereof.

The formed stray light L 'is incident on the light valve 15G as shown in Fig. 22, which forms an image on the screen by the after-optical system 19, but at this time, a colored spot is formed on the screen.

Therefore, in the present embodiment, in order to block such stray light, the light shielding portion 62X is formed by the attachment piece 62Y on the condenser lens 62R as shown in FIG. Since the light shielding portion 62X formed in the lens 62R reduces the amount of light passing through the light valve 15R, the area forming the light shielding portion 62X is formed from the lower portion of the condenser lens 62R, that is, from the light source 11. It is limited only to the part where stray light L is incident directly.

According to this embodiment, the projection light projected on the screen is somewhat sacrificed in light quantity, but it is possible to effectively block stray light by at least changing the configuration of Fig. 21 (a) and the like.

Example 10

FIG. 25 shows the configuration of a full-color projection optical apparatus according to the tenth embodiment of the present invention capable of blocking stray light L 'in the configuration of FIG. However, the same reference numerals are attached to the above-described parts, and description is omitted.

Referring to FIG. 25, in the present embodiment, the direction of the polarization axis (transmission axis) of the polarization elements 20R and 21R is set in the direction orthogonal as shown in FIG. It rotates 90 degrees with respect to the state of FIGS. However, in the present embodiment and the following embodiments, the transmission axis or the direction of the polarization plane is the transmission axis when viewed in the plane perpendicular to the optical path of the beam with respect to each light beam or stray light L 'of R, G, and B'. The R, G, and B appear at angles opposite to the plane defined by the optical path of each light beam. Therefore, in the present embodiment, the transmission axis of the polarizing element 20R has the same direction as the direction of the transmission axis of the polarizing element 20G.

In this configuration, the polarization plane of the stray light L 'reflected by the reflective polarization element 20R is orthogonal to the polarization plane of the stray light L' shown in FIG. 22, and therefore, the stray light L 'is a light valve ( It is interrupted by the polarization elements 20G and 21G arranged on the incidence side of 15G), and incident on the light valve 15 is avoided. However, in the present embodiment, the transmission axis of the polarizing element 20G does not have to be strictly orthogonal to the transmission axis of the polarizing element 20R, and is orthogonal to the intensity of the stray light L 'or the display quality depending on the target display quality. What is necessary is just to set it to the appropriate range near a state.

Example 11

Fig. 26 shows a part of the full color projection optical device according to the eleventh embodiment of the present invention. It should be noted that the same reference numerals are given to the parts described above in Fig. 26, and description thereof is omitted.

Referring to FIG. 26, in this embodiment, the absorbing polarizing element 21R and the light valve 15R are oriented in the same direction as in FIG. 22 or 23, and only the reflective polarizing element 20R reflects the stray light L '. To be oriented as in the case of FIG. 25. In this case, since the direction of the transmission axis of the reflective polarization element 20R and the direction of the transmission axis of the absorption polarization element 21R and the absorption polarization element 21R are orthogonal as indicated by arrows in Fig. 26, respectively, A polarization plane of polarized light having passed through the reflective polarization element 20R by inserting a λ / 2 phase difference plate 2 / λ between the reflective polarization element 20R and the transmission axis of the absorption polarization element 21R. Rotate to match. However, the λ / 2 retardation plate has a function of delaying λ / 2 only in the phase of the light whose wavelength passes through λ.

Also in this configuration, since the polarization plane of the stray light L 'reflected by the reflective polarization element 20R is orthogonal to the transmission axis of the next polarization element 20G, 21G, it is effectively blocked by the polarization elements 20G, 21G. do. Also in this embodiment, the transmission axis of the polarizing element 20G does not need to be strictly orthogonal to the transmission axis of the polarizing element 20R, and the orthogonal state depends on the intensity of stray light L 'or on the target display quality. It is sufficient to set the appropriate range of the root of. In addition, the phase difference plate need not be exactly to form a phase difference of lambda / 2.

Example 12

Fig. 27 shows a part of a full color projection optical device according to a twelfth embodiment of the present invention. In FIG. 27, the same reference part is attached to the above-described part, and description is omitted.

Referring to Fig. 27, the present embodiment sets the directions of the transmission axes of the polarizing elements 20R and 21R as in the case of Figs. 22 and 23, and accordingly, the direction of the light valve 15R is also shown in Figs. 22 and 23. Set the same as in the case of. In addition, the directions of the polarizing element 21G and the light valve 15G are also set similarly to FIGS. 22 and 23.

On the other hand, in order to block the stray light L 'generated by the reflective polarizing element 20R, in the embodiment of FIG. 27, the direction of the reflective polarizing element 20G is set to the direction orthogonal to FIGS. In addition, since the polarization passing through the polarization element 20G rotates the polarization plane to coincide with the transmission axis of the polarization element 21G, the polarization element 20R and the polarization element 21R in the embodiment of FIG. The λ / 2 positioning plate λ / 2 that has been disposed is interposed between the polarizing element 20G and the polarizing element 21G.

In the present embodiment, as described above, the stray light L 'formed in the reflective polarization element 20R may be blocked by the polarization element 20G. Moreover, it is not necessary to strictly orthogonally cross the transmission axis of the polarization element 20R of the transmission axis of the polarization element 20G, and it is suitable range in the vicinity of the said orthogonal state according to the intensity of stray light L 'or the target display quality. Set to. In addition, the phase difference plate need not be exactly to form a position image of lambda / 2.

Example 13

Fig. 28 shows a part of a full color projection optical apparatus according to the thirteenth embodiment of the present invention. In Fig. 28, the same reference numerals are given to the above-described parts, and description thereof is omitted.

Referring to FIG. 28, in this embodiment, in the same configuration as in FIG. 22 or 23, the lambda / 2 phase difference plate (λ / 2) used to rotate the polarization plane of stray light L 'by 90 degrees in the previous embodiment Arrangement is provided between the condenser lens 62G and the reflective polarizing element 20G.

In this configuration, the stray light L 'is polarized because the polarization plane of the stray light L' formed at the polarization element 20R is rotated 90 degrees by the retardation plate λ / 2 orthogonal to the transmission axis of the polarization element 20G. Substantially completely blocked by element 20G and the polarizing element 21G thereafter. In addition, the transmission axis of the polarizing element 20G does not need to be strictly orthogonal to the transmission axis of the polarizing element 20R, and is suitable for the vicinity of the orthogonal state depending on the intensity of stray light L 'or the target display quality. Set it to a range. Moreover, the phase difference plate (lambda) / 2 does not need to generate | occur | produce phase difference (lambda) / 2 strictly, either.

Example 14

Fig. 29 shows a part of a full color projection optical apparatus according to the fourteenth embodiment of the present invention. In FIG. 29, the same reference numerals are given to the above-described parts, and description thereof is omitted.

Referring to Fig. 29, in this embodiment, Fig. 22 is the same configuration as Fig. 23, and the lambda / 2 retardation plate lambda / 2 used to rotate the polarization plane of stray light L 'by 90 degrees in the previous embodiment. Arrangement is provided between the condenser lens 62R and the reflective polarizing element 20R.

Even in such a configuration, since the polarization plane of the stray light L 'formed at the polarization element 20R is rotated 90 degrees by the retardation plate λ / 2 so that the polarization element 20G is orthogonal to the transmission axis, the stray light L' ) Is substantially completely blocked by the polarizing element 20G and the polarizing element 21G behind it. In addition, the transmission axis of the polarizing element 20G does not need to be strictly orthogonal to the transmission axis of the polarizing element 20R, and according to the intensity of stray light L 'or the desired display quality, it is appropriate that the transmission axis of the polarizing element 20G is near the orthogonal state. Set it to a range. Moreover, the phase difference plate (lambda) / 2 does not need to generate | occur | produce phase difference (lambda) / 2 strictly, either.

Example 15

Fig. 30 shows the construction of a part of the full color projection optical apparatus according to the fifteenth embodiment of the present invention.

Referring to FIG. 30, this embodiment is similar to the configuration of FIG. 25, but simplifies the configuration in which the absorption type polarizing elements 21R and 21G are omitted. In the structure of this embodiment, since the polarization element is only 21R or 21G, the linearity of the polarization of the R or G light beam obtained is not good, but since the configuration is simple, it can be configured at low cost. Other features of this embodiment are apparent in the foregoing description, and thus description thereof is omitted.

Example 16

Fig. 31 shows the construction of a part of the full color projection optical apparatus according to the sixteenth embodiment of the present invention.

Referring to FIG. 31, the present embodiment is similar to the configuration of FIG. 26, but the structure of the present invention is simplified by omitting the same absorption type polarizing elements 21R and 21G as the embodiment of FIG. 30. In the configuration of this embodiment, since the polarization element is only 21R or 21G, the linearity of the polarization of the light beam of R or G obtained is not good, but since the configuration is simple, it can be configured at low cost. Other features of this embodiment are apparent in the foregoing description, and description thereof will be omitted.

Example 17

32 shows the configuration of a part of a full color projection optical apparatus according to the seventeenth embodiment of the present invention.

Referring to FIG. 32, the present embodiment is a modification of the embodiment of FIG. 30, and the λ / 2 phase difference plate λ / 2 is inserted between the reflective polarizing element 20G and the light valve 15G of FIG. 30. have. Accordingly, the light valve 15G is arranged to be rotated by 90 degrees with respect to the case of FIG. 30 in the embodiment of FIG. 32. Other features of this embodiment are apparent from the above-described embodiment, and thus description thereof is omitted.

Example 18

Fig. 33 shows the construction of a part of the full color projection optical apparatus according to the eighteenth embodiment of the present invention.

Referring to FIG. 33, this embodiment is a modification of the embodiment of FIG. 28, and has a configuration in which the absorption type polarizing elements 21R and 21G are omitted from the apparatus of FIG. Other features of this embodiment are apparent from the above-described embodiment, and thus description thereof is omitted.

Example 19

Fig. 34 shows the construction of a part of the full color projection optical apparatus according to the nineteenth embodiment of the present invention.

Referring to FIG. 34, this embodiment is a modification of the embodiment of FIG. 29, and has a configuration in which the absorbing polarizing elements 21R and 21G are omitted from the apparatus of FIG. 29. Other features of this embodiment are apparent from the above-described embodiment, and thus description thereof is omitted.

Example 20

In each of the embodiments under the ninth embodiment described above, as shown in Fig. 35A, the stray light L 'reflected by the reflective polarization element 20R is emitted at an angle β while the light valve 15G is released. Is incident on the left half of the mirror, which is reflected off the mirror 75 and projected onto the screen. In the example of FIG. 35A, the center of stray light L 'passes through approximately the bottom edge of the mirror 75.

Therefore, the present embodiment is configured as shown in Fig. 35B to avoid such incidence of stray light L 'into the light valve 15G. However, the same reference numerals are given to the above-described parts in FIG. 35 (b), and description is omitted.

Referring to Fig. 35 (b), the polarizing element 20R is inclined by the angle α from the left to the counterclockwise in the plane perpendicular to the optical path of the R light passing through the light valve 15R. For example, in the case of Fig. 35A, by setting the angle α to 1/2 or more of the divergence angle β (α ≧ β / 2), the stray light L 'is completely removed from the mirror 75. It is possible to remove.

The inclination of the polarizing element 20R is not limited to the above example, but the reflected stray light L 'is deflected from the mirror 75, and may be set how. However, when the angle α is gradually increased, since the direction of the apparent transmission axis of the polarizing element 20R when viewed from the direction parallel to the optical path of the R light is slightly shifted from the direction, the polarization element of the polarizing element 20R It is necessary to correct it so that the direction of a transmission axis may not shift.

Other features of this embodiment are apparent from the foregoing description, and thus description thereof is omitted. Note that corresponding reference numerals are given to the above-described parts in Figs. 35A and 35B.

Example 21

36 shows a part of a full color projection optical device according to a twenty-first embodiment of the present invention. However, the same reference numerals are given to the above-described parts in FIG. 36, and description thereof is omitted.

This embodiment omits the absorbing polarizing element 21R or 21G disposed behind the reflective polarizing element 20R or 20G as a modification of the embodiment of FIG. 35.

Also in this embodiment, since the reflective polarization element 20 into which stray light L is incident is disposed to be inclined by an angle α, the reflected stray light L 'is reflected from the mirror 75, and the projection optical system ( 19) can avoid the problem projected on the screen.

Other features of this embodiment are apparent from the foregoing description, and thus description thereof is omitted.

Example 22

Fig. 37 shows a part of a full color projection optical device according to a twenty-second embodiment of the present invention. If so, the same reference numerals are given to the above-described parts in FIG. 37, and description thereof is omitted.

This embodiment is a variation of the embodiment of Fig. 28 described above, and instead of the lambda / 2 phase difference plate of the embodiment of Fig. 28, the? / 4 phase difference plate? / 4 is delayed by? / 4 of the phase of the light beam passing through. It is arranged between the condenser lens 62G and the reflective polarizing element 20G, and the phase of stray light L 'reflected by the polarizing element 20R and the phase of stray light L' incident on the polarizing element 20G. (Lambda) / 4 phase difference plate ((lambda) / 4) is also inserted between the condenser lens 62R and the polarizing element 20R so that the phase difference between them may be (lambda) / 2. Also in this configuration, since the polarization plane of the stray light R 'reflected by the polarization element 20R is orthogonal to the transmission axes of the polarization elements 20G and 21G, the stray light L' incident on the light valve 15G is Effectively blocked.

Example 23

38 shows a part of a full color projection optical apparatus according to a twenty-third embodiment of the present invention. However, the same reference numerals are given to the above-described parts in FIG. 38, and description is omitted.

In this embodiment, as a variation of the embodiment of FIG. 37 described above, a λ / 6 retardation plate (λ / 6) that has delayed the phase of the light beam passing by λ / 6 instead of one of the λ / 4 retardation plates of the embodiment of FIG. Instead of the other λ / 4 retardation plate, a λ / 3 retardation plate λ / 3 is provided to delay the phase of the light beam passing by λ / 3. Since the sum of the phase differences formed by the retardation plate λ / 3 and the retardation plate λ / 6 is λ / 2 as in the previous embodiment, the stray light reflected by the polarizing element 20R also in this configuration. The polarization plane of R ') is orthogonal to the transmission axis of the polarization element 20G or 21G. That is, in this embodiment, stray light L 'incident on the light valve 15G is effectively blocked. As shown in parentheses in FIG. 38, the retardation plate λ / 3 and the retardation plate λ / 6 may be interchanged with each other.

Example 24

39 shows a part of a full color projection optical device according to a twenty-fourth embodiment of the present invention. However, the same reference numerals are attached to the above-described parts, and description is omitted.

The embodiment of Fig. 39 omits the absorbent pieces and elements 21R and 21G in the configuration of Fig. 37 as one variation of the embodiment of Fig. 37. Even in such a configuration, the stray light L 'reflected by the reflective polarizing element 20R passes through the retardation plate λ / 4 twice so that the polarization plane rotates by 90 degrees, and as a result, is effectively blocked by the polarizing element 20G. do.

(Example 25)

Fig. 40 shows a part of a full color projection optical device according to a twenty fifth embodiment of the present invention. However, the same reference numerals are attached to the above-described parts, and description is omitted.

The embodiment of FIG. 40 omits the absorption type polarization elements 21R and 21G in the configuration of FIG. 38 as a heat deformation example of the embodiment of FIG. 38. The stray light L 'reflected by the reflection type polarizing element 20R sequentially passes through the retardation plate λ / 3 and the retardation plate λ / 6, and the polarization plane rotates by 90 degrees. It is effectively blocked at element 20G. As in the previous embodiment, the order of the retardation plates λ / 3 and λ / 6 may be changed.

Example 26

41 (a) and 41 (b) show the configuration of the retardation plate in particular as part of the full color projection optical device according to the twenty-sixth embodiment of the present invention.

Referring to FIG. 41A, the reflective polarizing element 20R or 20G is formed in close contact with one side of the glass substrate 20S, and any of λ / 2, λ / 3, λ / 4, and λ / 6. The retardation plate which is good even if it adheres to the other side of the glass substrate 20 similarly is formed. In such a configuration, light loss due to reflection at the interface is reduced as compared with the case where the polarizing element and the retardation plate are separately arranged in the air.

FIG. 41B shows the absorption type polarizing element 21R or 21G in close contact with one side of the glass substrate 21S, and the retardation plate λ / 2, λ / 3, λ / 4 or λ / on the other side. The structure which formed 6) is shown. In this case as well, light loss due to reflection at the interface can be reduced.

Example 27

42A and 42B show the configuration of the reflective polarization element 21R according to the twenty-seventh embodiment of the present invention.

Referring to Fig. 42 (a), the polarizing element 21R is formed on the glass substrate 21S in the same manner as the example of Fig. 41 (a), but the polarizing element 21R of the present embodiment is arranged on the reflective surface thereof. Irregular unevenness 21r is formed, and the reflected light is diffusely reflected by such unevenness 21r. As a result, stray light L 'is uniformly diffused and incident on the light valve 15G, and becomes inconspicuous even when projected onto the screen.

Fig. 42B is a modification of Fig. 42A, in which grooves 21g are formed uniformly in place of the unevenness 21r. Also in this case, the effect of diffusing the same stray light L 'can be obtained.

Example 28

Fig. 43 shows the construction of a full color projection optical device according to a twenty-eighth embodiment of the present invention. However, the same reference numerals are attached to the above-described parts, and description is omitted. This embodiment can be seen as a modification of the embodiment of FIG. 25.

Referring to FIG. 43, the projection optical apparatus of this embodiment has a configuration in which the direction of the light valve 15R is rotated 90 degrees with respect to the case of FIG. 25 in the embodiment of FIG. 25. In this case, since the direction of the polarization plane of the light beam incident on the light valve 15R is orthogonal to the direction of the light valve 15R, when the light valve 15R is driven in the so-called normal white mode like the light valve 15G, Conversely, it operates in normal black mode.

For this reason, in the present embodiment, the light valve 15R is driven by the drive signal in the normal black mode, so that the image signal of the R light obtained by the light valve 15R is converted to normal white as the image signal of the G light obtained by the light valve 15G. It is. Also with the structure of this embodiment, stray light L 'can be blocked from the embodiment of FIG.

Example 29

Fig. 44 shows the construction of a full color projection optical apparatus according to the twenty-ninth embodiment of the present invention. However, the same reference numerals are attached to the above-described parts, and description is omitted.

Referring to FIG. 44, the device of the present embodiment is a variation of omitting the absorbing polarizing elements 21R and 21G in the device of FIG. 43, and the light valve 15R is in the normal black mode as in the embodiment of FIG. It is driven by the drive signal of. Other features of the present embodiment are the same as those in the embodiment of Fig. 43, and description thereof will be omitted.

Example 30

45A shows the configuration of the polarization processing apparatus 110 according to the thirtieth embodiment of the present invention.

In the above embodiment, any of the outgoing light beams emitted from the light source, only the necessary polarization component passes through the reflective polarization element and is used for displaying image information, but the unnecessary polarization component reflected by the reflective polarization element disappears. Therefore, even when using a light source with a high angle of brightness, only half of its capacity was used.

On the other hand, in the polarization processing apparatus 110, the optical member 111 including the flat convex lens elements 111a and 111b is disposed on the optical paths l, m and n of the light beams incident from the light source. And the reflective polarization element 20 corresponding to the reflective polarization element 20 described above with reference to FIGS. 8 (a), (b), 9 (a), (b) or 10 (a), (b). 112a and 112b are disposed so as to be inclined with respect to the optical axis of the lens element 111a or 111b on the optical path of the light beam focused on the lens element 111a and 111b, respectively. In the optical element 111 including the lenses 111a and 111b, an optically invalid region is formed in which the light beams collected by the lenses 111a and 111b do not reach. A mirror 113 is arranged to reflect the unnecessary polarization component reflected by the reflective polarization element 112a.

The mirror 113 deflects the unnecessary polarization component in the gap formed between the reflective optical element 112a and the adjacent reflective optical element 112b and only shifts the phase of the light beam passing through this gap by about λ / 2. A slowing lambda / 2 phase difference compensation plate 114 is formed.

According to this structure, the necessary polarization components la, ma, na of light rays l, m, n that are focused by the lens element 111a and incident on the reflective polarization element 112a pass as they are. Unnecessary polarization components 1b, mb and nb are reflected by reflective polarization element 112a and then deflected to mirror 113, passing through the phase difference compensating plate 114. In this case, the polarization planes of the deflection components lb, mb, and nb rotate about 90 degrees by the phase difference compensating plate 114 to substantially coincide with the polarization planes of the necessary deflection components la, ma, and na. As a result, by providing such a deflection processing apparatus 110, substantially all energy except for absorbing the emitted light formed by a light source can be used for display, and bright display with high brightness is attained especially.

45 (b) shows a modification of the deflection processing apparatus 110.

Referring to FIG. 45 (b), in the present embodiment, instead of the lambda / 2 phase difference compensation plate 114, a lambda / 4 phase difference compensation plate 114a for delaying the phase of the passing light beam by? / 4 and the reflection (Lambda) / 4 phase (s) difference plate 114b which rotates the phase of the required polarization component which passed the mold deflection elements 112a and 112b, and therefore the polarization plane by 90 degrees is provided. Even in such a configuration, the polarization plane of the necessary polarization components la, ma, na and the polarization plane of the light beam passing through the phase difference compensating plate 114a can be matched.

Example 31

46 and 47 show the configuration of the polarization processing apparatus 120 according to the thirty-first embodiment of the present invention.

46 and 47, in the present embodiment, the mirror 113 is formed on the output side flat surface of the optical member 111, which becomes the flat convex lenses 111a and 111b, and the reflective polarization element 112a. , 112b is formed on the transparent substrate 115 formed on the emission-side flat surface of the optical member. In this case, the reflective polarizing elements 112a and 112b may pass through the λ / 2 retardation compensator 114 after the reflected unnecessary polarization component is reflected from the mirror 113 on the flat surface. The angle of inclination is optimized.

In the configuration of the present embodiment, as shown in FIG. 47, the emission-side flat surface of the optical member 111 corresponds to the optical path of the light beam condensed by the lens elements 111a and 111b to be a reflective film constituting the mirror 113. A plurality of openings or pinholes 113a are formed in the mirror 113. In such a configuration, since the optical member 111 and the mirror 113 are integrally formed, the manufacturing cost can be reduced. As shown in Fig. 47, the lens elements 111a, 111b, ... are formed in the so-called most hermetically charged state, and as a result, the area of the invalid region 113X shown in Fig. 47 is minimized. That is, the light utilization efficiency of the polarization processing apparatus 120 is maximized by the arrangement of the lens elements shown in FIG.

Example 32

48 shows the configuration of a polarization processing apparatus 130 according to a thirty-second embodiment of the present invention. However, in the above-described part of FIG. 48, the corresponding reference numerals are attached, and description thereof is omitted.

Referring to FIG. 48, the polarization processing apparatus 130 is a variation of the polarization processing apparatus 120 of FIG. 46. Instead of the optical member 111 including the flat convex lens elements 111a and 111b, An optical member 131 is used that includes convex lens elements 131a and 131b. The cylindrical lens elements 131a and 131b extend in parallel, and correspondingly, the mirror 113 is formed in a stripe shape in parallel. The mirror 113 is formed corresponding to the optically invalid area formed by the lens elements 131a and 131b. In the present embodiment, the reflective polarizing elements 112a and 112b are formed on the transparent substrate 115. Respectively, the lens elements 131a and 131b are formed in parallel stripes to correspond to the optical paths of the focused light beams. In addition, corresponding to the stripe mirror 113, a stripe λ / 4 phase difference compensating plate 114 is formed on the transparent substrate 115 in a stripe shape. The reflective polarization elements 112a and 112b optimize the inclination angle so that the reflected unnecessary polarization component is incident on the mirror 113 and passes through the λ / 4 phase difference compensation plate 114 after being reflected.

Example 33

49 shows a polarization processing apparatus 140 according to a thirty-third embodiment of the present invention. However, the same reference numerals are given to the above-described parts in Fig. 49, and description is omitted.

Referring to FIG. 49, the polarization processing apparatus 140 is a variation of the polarization processing apparatus 130 of FIG. 48, instead of the cylindrical lens elements 131a and 131b, the optical axis surface of the cylindrical lens elements 131a or 131b. An optical member 141 is used that includes asymmetric cylindrical lens elements 141a and 141b that are formed only in a portion located on one side of the. Since the lens elements 141a and 141b are asymmetrical with respect to the optical axis, the lens elements 141a and 141b focus the incident light beam obliquely, and as a result, even if the reflective polarizing element 112a or 112b is not inclined with respect to the optical axis. The reflected unnecessary polarization component is incident on the mirror 113 and is reflected to pass through the [lambda] / 4 phase difference compensation plate 114 formed between the polarization elements 112a and 112b.

Since the polarization processing apparatus 140 does not need to tilt the reflective polarization elements 112a and 112b, the polarization processing apparatus 140 is easier to manufacture than the polarization processing apparatus 130.

Example 34

50 shows the configuration of a polarization processing apparatus 150 according to a thirty-fourth embodiment of the present invention. However, the same reference numerals are given to parts corresponding to the above-described parts in FIG. 50, and description thereof will be omitted.

Referring to FIG. 50, the polarization processing apparatus 150 has a configuration similar to that of the polarization processing apparatus 130 of FIG. 48, but is arranged so that the optical axis surfaces of the lens elements 131a and 131b are inclined with respect to the optical path of the incident light beam. The reflective polarizing elements 112a and 112b are formed on the transparent substrate 115 so as to be orthogonal to the optical axis surfaces of the lens elements 131a and 131b, in other words, to have an inclination angle of zero.

In this configuration, since the incident light beam is inclined with respect to the optical axis planes of the lens elements 131a and 131b even if the inclination angles of the reflective polarization elements 112a and 112b are zero, the reflections from the reflective polarization elements 112a and 112b are reflected. After the incident unnecessary polarization component is incident on the mirror 113, it passes through the [lambda] / 4 phase difference complementary plate 114.

Example 35

51 shows the configuration of a polarization processing apparatus 160 according to a thirty-fifth embodiment of the present invention. However, the same reference numerals are given to parts corresponding to the above-described parts in FIG. 51, and description thereof will be omitted.

Referring to FIG. 51, the polarization processing apparatus 160 has a configuration similar to that of the polarization processing apparatus 150 of FIG. 50, but includes a scattering element 117 that scatters incident light on the reflective polarization elements 112a and 112b. It differs in that point. By providing the scattering element 117, the unnecessary polarization component reflected by the reflective polarization elements 112a and 112b can be surely incident on the mirror 13 and the λ / 2 retardation compensator 114.

Example 36

52 shows the configuration of a polarization processing apparatus 170 according to a thirty sixth embodiment of the present invention. If not, the same reference numerals are given to parts corresponding to the above-described parts in FIG. 52, and description thereof is omitted.

Referring to FIG. 52, the polarization processing apparatus 170 has a configuration similar to that of the polarization processing apparatus 130 of FIG. 48, but the lens element 131a in the optical path of the polarized light beam passing through the reflective polarization elements 112a and 112b. , 131b differs in that the optical member 118 including the lens elements 118a and 118b respectively corresponds to the arrangement.

By arranging the optical member 118, it is possible to bring the light beam emitted from the polarization processing apparatus 170 closer to the parallel light beam.

Similarly, the constitution is also effective for the polarization processing apparatus 120 in FIG. 46 using the ordinary flat convex lens array 111 instead of the cylindrical lens.

Example 37

53 shows the configuration of a polarization processing apparatus 180 according to a thirty seventh embodiment of the present invention. It should be noted that the same reference numerals are given to parts corresponding to the above-described parts in FIG. 53, and description is omitted.

Referring to FIG. 53, the polarization processing apparatus 180 is a variation of the polarization processing apparatus 140 of FIG. 49, but the lower surface of the transparent substrate 115 is continuously covered by the reflective polarization element 112. Among the transparent substrates 115 between the reflective polarizing element 112 and the mirror 113, a λ / 4 phase difference compensating plate 119 which delays the phase of a passing light beam by approximately λ / 4 is provided. Intervening so that it extends continuously in parallel to).

In this configuration, the light beam incident on the lens element 141a and reflected on the reflective polarization element 112 is converted into a circularly polarized beam when passing through the λ / 4 phase difference compensation plate 119 toward the mirror 113. And passing the phase difference compensating plate 119 from the mirror 113 toward the reflective polarizing element 112 a second time, the linearly polarized beam having a polarizing plane rotated about 90 degrees with respect to the original polarizing plane. Is changed. The obtained linearly polarized beam passes through the reflective polarizing element 112 because it has a polarization plane that coincides with the transmission axis of the reflective polarizing element 112.

The polarization processing apparatus 180 of FIG. 53 is particularly simple in structure and can be manufactured at low cost.

Example 38

54A and 54B show different configurations of the optical member 11 according to the thirty eighth embodiment of the present invention, respectively.

54 (a) and (b), each of the planar lens elements 111a and 111b constituting the optical member 111 is covered by a reflective film whose sidewall surface forms an extension of the mirror 113. As a result, the proportion of the light beams that arrive and block the optically invalid region corresponding to the mirror 113 is reduced.

In the configuration of Fig. 54 (a), it is more effective to reduce the ratio of the light rays blocked by the mirror 113, while the sidewall surface is inclined, and the construction having the vertical sidewall surface of Fig. 54 (b) is easier to manufacture. It is easy.

54 (a) and 54 (b) are effective for the optical member 131 serving as the cylindrical lens array in addition to the optical member 111.

Example 39

FIG. 55 shows a projection optical device 200 according to the thirty-ninth embodiment of the present invention in which the polarization processing apparatus 190 of the present invention is applied to the color projection optical device 70 shown in FIG. In Fig. 55, parts corresponding to those described above are denoted by corresponding reference numerals, and description thereof is omitted.

Referring to FIG. 55, the polarization processing apparatus 190 may be any of the polarization processing apparatuses 110 to 180 described above, and an emission side of the light source 11, that is, the light source 11 and the dichroic mirror 71. ) Is arranged between. By forming the polarization processing apparatus 190, the light energy emitted from the light source 11 can be converted into a polarized light beam having substantially all of the desired polarization planes, and thus not shown by the projection optical system 19. The erection of the image projected onto the image is greatly improved as compared to the case where the conventional unnecessary polarization component is eliminated.

Other features of FIG. 55 are as described above, and descriptions thereof are omitted. In FIG. 55, the light valves 15R, 15G, and 15B include an incident side polarization element and an exit side polarization element, in which none is shown, and the polarization plane of the incident side polarization element exits the polarization processing apparatus 190. It is coincided with the polarization plane of the polarized light beam.

Example 40

56 shows the configuration of a polarization processing apparatus 210 according to a 40th embodiment of the present invention. In FIG. 56, the same reference numerals are attached to the same parts as those described above, and description thereof is omitted.

Referring to FIG. 56, the projection optical device 210 has a configuration similar to that of the projection optical device 200 of FIG. 55, but corresponds to each of the light valves 15R, 15G, and 15B and the polarization processing devices 190R, 190G, and 190R. Is formed. In such a configuration, since the polarized light beam emitted from the polarization processing device, for example, the polarization processing device 190R directly enters the corresponding light valve 15R, it is possible to omit the incident side polarization element of the light valve.

Other features of the present embodiment are as described above and description thereof is omitted.

Example 41

As mentioned above, although the application of the polarization processing apparatus by this invention to the projection optical apparatus was demonstrated, the polarization processing apparatus using the reflective polarization element by this invention is not only a high output projection optical apparatus but also a direct view type liquid crystal display device, It is also effective for increasing display brightness.

Fig. 57 shows the configuration of the direct view side liquid crystal display device 220 using the polarization processing apparatus of the present invention.

Referring to FIG. 57, the liquid crystal display device 220 includes a surface light source 221 and a liquid crystal panel 229 disposed to face the surface light source 221, and the liquid crystal panel 229 is normally used. And a liquid crystal layer 225 enclosed between a pair of opposing glass substrates 224 and 227, and an incident side polarizing plate 223 on the side facing the light source 221 of the lower glass substrate 224. Moreover, the emission side polarizing plate 228 which has a polarization plane orthogonal to the polarization plane of the said incident side polarizing plate 223 is formed in the emission side of the upper glass substrate 227. As shown in FIG. In addition, the emission-side glass substrate 227 forms a color filter 226 on the side encapsulating the liquid crystal layer 225. In FIG. 57, the glass substrates 224 and 227 are not shown on the side in contact with the liquid crystal layer 225, but form a normal molecular alignment film and an electrode.

The liquid crystal display device 220 of FIG. 57 further arranges the polarization processing device 222 which may be any of the polarization processing devices 110 to 180 described above between the surface light source 221 and the liquid crystal panel 229. Equip. At this time, the polarization plane of the incident-side polarizing plate 223 is matched with the polarization plane of the polarized light beam emitted from the polarization processing apparatus 222. As a result, all of the energy of the light beam formed by the surface light source 221 is converted into a polarized light beam having a polarization plane substantially coincident with the polarization plane of the incident side polarizing plate 223, and is then viewed by the direct-view display device 220. The display brightness obtained is greatly improved.

Example 42

58 shows the construction of a direct-view liquid crystal display 230 according to a forty-second embodiment of the present invention. It should be noted that the same reference numerals are given to parts corresponding to the above-described parts in FIG. 58, and description thereof is omitted.

Referring to FIG. 58, the liquid crystal display device 230 has a configuration similar to that of the liquid crystal display device 220 of FIG. 57, but is disposed between the polarization processing device 222 and the liquid crystal panel 229. It differs in that the scattering plate 231 which spreads the light beam radiate | emitted from ()) is arrange | positioned. By arranging and providing the scattering plate 231, the liquid crystal panel 229 can be uniformly illuminated.

In the direct view type liquid crystal display devices 220 and 230 of the forty-first or forty-second embodiments, the required brightness can also be obtained, and a light source having a lower power can be used, and when applied to a portable information processing device or the like, the battery can be operated for a longer time with a limited battery. do.

Example 43

In each of the above embodiments, the reflective polarization element is formed by lamination of the liquid crystal layer, for example, as described in FIG. 8 (a). When used with respect to a light source, a problem may occur in which the liquid crystal layer is deteriorated by the ultraviolet component included in the light beam emitted from the light source.

59 shows the emission spectrum of the W lamp.

Referring to FIG. 59, the spectrum includes an ultraviolet component (UV) having a wavelength of about 400 nm or less and a visible light component having a wavelength of about 400 to 700 nm and an infrared component (IR) having a wavelength of 700 nm or more, but includes an ultraviolet component (UV). It can be seen that the ratio of reaches several percent.

Therefore, in the present embodiment, the spectrum ultraviolet blocking filter shown in FIG. 60 is disposed between the light source and the reflective polarizing element to block the ultraviolet component UV of FIG. Sunscreen Filter Reflects more than 99% of the UV component. For example, a SiO ₂ film and the Al ₂ O ₃ alternately stacked in a multi-layer film filter film, an ultraviolet component as a result the transmission can be suppressed to 1% or less.

Fig. 61 shows the spectrum of the light beam from the light source passed through this ultraviolet cut filter. As can be seen from FIG. 61, it can be seen that the light beam passing through the filter contains almost no ultraviolet component. In the ultraviolet blocking filter using the multilayer film, the dependency of the transmission characteristic on the polarization of the incident beam does not occur.

62 shows the spectrum obtained when the light beam having the spectrum of FIG. 61 is passed through the reflective polarization element.

FIG. 63 shows the configuration of the projection optical apparatus 300 according to the 43rd embodiment of the present invention using such an ultraviolet cut filter. However, the same reference numerals are given to parts corresponding to the above-mentioned parts, and description is omitted.

Referring to FIG. 63, the projection optical device 300 has a similar phrase as the projection optical device shown in FIG. 1, but between the light source 11 and the reflective polarizing element 20, a UV blocking filter 301 having a multilayer film structure is formed. It differs in the point of installation. The ultraviolet cut filter 301 has the spectrum shown in FIG. 60 and reflects an ultraviolet component having a wavelength of about 400 nm or less in the direction of the light source 11. As a result, the degradation by the ultraviolet rays of the reflective polarizing element 20 can be avoided.

Other features of the projection optical device 300 are as described above with reference to FIG. 1, and descriptions thereof are omitted.

Example 44

64 shows the configuration of the projection optical apparatus 310 in the 44th embodiment of the present invention. In FIG. 64, parts corresponding to those described above are denoted by the same reference numerals and description thereof will be omitted.

Referring to FIG. 64, the projection optics 310 has a configuration similar to that of FIG. 13, but between the lens 62 and the reflective polarizing element 20, the same as that of FIG. The filter 301 is arrange | positioned.

In the projection optical device 310 of FIG. 64, in addition to avoiding deterioration due to the ultraviolet component of the reflective polarizing element 20, by installing the lens 62, the reflective polarizing element 20 is reflected by the reflective polarizing element 20, thereby filtering the filter. Unnecessary polarization, which is returned via 301, is removed from the light source so that the temperature rise of the light source 11 is avoided.

Example 45

65 shows a configuration of a projection optical device 320 according to the 45th embodiment of the present invention. It should be noted that the same reference numerals are given to parts corresponding to the above described parts in FIG. 65, and description thereof will be omitted.

Referring to FIG. 65, the projection optical device 320 may be considered to be a modification of the projection optical device 70 of FIG. 15, and the white light beam W including the ultraviolet component (UV) emitted from the light source 11 may be considered. After the silver dichroic mirror 71A, only the red light beam component R is polarized and reflected by the mirror 73A, the light is sequentially modulated through the reflective polarizing element 20R and the absorbing polarizing element 21R. Element 15R is reached. The red light beam R having passed through the spatial variation element 15R also passes through the exit-side polarizing element 16R and then reaches the transmission lens 19 (not shown) through a synthetic optical system (not shown).

On the other hand, the blue component (B), green component (G), and ultraviolet component (UV) in the white light beam pass straight through the dichroic mirror 1A, enter the ultraviolet blocking filter 301, and enter ultraviolet light. The component (UV) is reflected and removed. As a result, the blue component B and the green component G pass through the reflective polarization element 20BG and the absorption polarization element 21BG, and then reach and spatially modulate the spatial modulation element 15BG. The spatially modulated light beam also passes through the exit-side polarization element 16BG and then reaches the projection lens 19 (not shown) through a synthetic optical system (not shown).

In the present embodiment, since the ultraviolet cut filter 301 is formed only at a necessary place behind the color separation optical system, the configuration is simplified.

Example 46

66 shows a configuration of a projection optical device 330 according to the forty-sixth embodiment of the present invention. It should be noted that the same reference numerals are given to parts corresponding to the above described parts in FIG. 66, and description thereof will be omitted.

Referring to FIG. 66, the projection optical device 330 may be regarded as one variation of the projection optical device 300 of FIG. 63, and the light source 11 is adjacent to the light exit opening, and thus separate UV blocking filter ( 302 is disposed to face the ultraviolet cut filter 301. According to this structure, the ultraviolet rays are blocked by the filters 301 and 302 twice. For example, if the filters 301 and 302 each reflect 99% of the ultraviolet light, the combination of the filters 301 and 302 may reflect 99.9% of the ultraviolet light.

In this embodiment, it is also possible to combine a plurality of UV blocking filters. In this case, the intensity of the ultraviolet rays reaching the reflective polarization element 20 decreases in proportion to the N power when the number of ultraviolet blocking filters is N.

Example 47

67 shows a configuration of a projection optical device 340 according to the forty-seventh embodiment of the present invention. In FIG. 67, parts corresponding to those described above are denoted by the same reference numerals and description thereof will be omitted.

Referring to FIG. 67, the projection optical device 340 is a variation of the projection optical device of FIG. 15, and the UV blocking filter 302 is formed in the opening of the light source 11, and the UV blocking filter 301 is formed. It is formed behind the condenser lens 62B so as to face the reflective polarizing element 20B.

In the configuration of FIG. 67, the ultraviolet component in the white light beam formed by the light source 11 is first reflected by the filter 302, but the remaining ultraviolet component passes through the dichroic mirror 71 together with the blue light beam B and is mirrored. After being reflected at 73, it is further reflected by the filter 301 on the back of the condenser lens 62B. As a result, the ultraviolet component reaching the reflective polarizing element 20B is almost completely blocked.

On the other hand, the red or green light beams R and G deflected by the dichroic mirror 71 do not contain ultraviolet components, and thus it is not necessary to form an ultraviolet cut filter on the condenser lens 62G or 62R.

According to such a structure, the structure of a projection optical device does not need to be complicated, and deterioration of the reflective deflection element exposed to an ultraviolet-ray can be suppressed effectively.

Example 48

68 shows a configuration of a projection optical device 350 according to the 48th embodiment of the present invention. It should be noted that the same reference numerals are given to parts corresponding to the above-described parts in FIG. 68, and description thereof is omitted.

Referring to FIG. 68, the projection optical device 350 is a variation of the projection optical device 330 of FIG. 66. The UV blocking filter 302 formed in the opening of the light source 11 includes the size of the light source opening. It is formed by the ultraviolet blocking filters 302a and 302b of the same configuration, which are separated by approximately the same distance as L).

FIG. 69 (a) shows the reflection by the filters 302a and 302b of the ultraviolet component when these filters 302a and 302b are arranged in close proximity.

Referring to Fig. 69 (a), when the distance between the filters 302a and 302b is narrow, the ultraviolet component is repeatedly reflected between the filters 302a and 302b, and at a constant rate to a certain degree, for example, 0.01% of ultraviolet rays. A component leaks outwards from the filters 302a and 302b. The more the repetition is, the more the ultraviolet component leaks from the filter.

In contrast, Fig. 69 (b) shows a case where the interval between the filters 302a and 302b is increased. In the case of Fig. 69 (b), since the distance between the filters 302a and 302b is large, the number of multiple reflections of the ultraviolet component is reduced and the leakage of the ultraviolet component from the filter is also reduced.

FIG. 70 shows the transmittance of the ultraviolet component emitted from the filter 302b when the distance between the filters 302a and 302b is varied in the configuration of FIG. 68.

Referring to FIG. 70, as indicated by the solid line, the ultraviolet component transmittance of the ultraviolet cut filter serving as the filters 302a and 302b decreases as the distance between the filters 302a and 302b increases, and the filter as shown in FIG. 68. The distance between 302a and 302b becomes substantially zero in that the size of the opening of the light source 11 is approximately the same.

Example 49

FIG. 71 shows another embodiment of the ultraviolet cut filter 302 as the filters 302a and 302b.

Referring to FIG. 71, the filter 302b is inclined with respect to the filter 302a, and as a result, the ultraviolet component reflected between the filter 302a and the filter 302b is guided laterally and scatters quickly. As a result, as shown by the broken line in FIG. 70, when the filters 302a and 302b are inclined to each other, even when the distance between the filters is shorter, ultraviolet transmittance can be reduced.

Example 50

72 (a) and (b) show the configuration of the reflective polarization elements 360 and 370 according to the fifty embodiment of the present invention. However, the same reference numerals are attached to parts corresponding to the above-mentioned parts, and description thereof is omitted.

Referring to FIG. 72 (a), the reflective polarizing element 360 may include the ultraviolet blocking filter 301 as the modified polarizing element 20 as one modification of the reflective polarizing element 20 shown in FIG. 2 (a). It forms directly in the incidence side of the glass substrate 40 which comprises a part of. As described above, since the filter 301 is formed by alternately stacking SiO ₂ films and Al ₂ O ₃ films, the filter 301 can be easily formed on the glass substrate 40.

In the example of FIG. 72 (b), the reflective polarization element 370 has the UV cut filter 301 at the glass substrate 40 at the exit side, and the filter 301 at the exit side of the substrate 40 and the liquid crystal layer 41. It includes so as to describe between. An antireflection film 371 is formed on the incident side of the substrate 40. In any of the configurations of FIGS. 72 (a) and 72 (b), the ultraviolet cut filter 301 is in close contact with the glass substrate 40, and the light reflection by the free surface of the filter 301 and the light thereof Loss is avoided.

Example 51

73 (a) and 73 (b) show examples of the ultraviolet cut filter according to the fifty-ninth embodiment of the present invention. However, the same reference numerals are given to the parts corresponding to the above-mentioned parts in Figs. 73 (a) and (b), and the description is omitted.

In the example of FIG. 73A, the ultraviolet cut filter 301 is, for example, an SiO ₂ film and an Al ₂ O ₃ on the incident side of the lens 62, which may be any of the condenser lenses 62R, 62G, and 62B. It is coated as a stack of films. In addition, in the example of FIG. 73 (b), the filter 301 is formed so as to be interposed between the element 20 and the lens 62 on the flat surface of the planar convex lens 62 in which the reflective polarizing element 20 is formed. have.

Also in these configurations, the problem of light loss due to the free surface is minimized.

As mentioned above, although this invention was demonstrated about the preferable Example, this invention is not limited to said Example, A various deformation | transformation and a change are possible within the summary of this invention.

According to the characteristic of this invention of Claim 1, in the polarizing apparatus which irradiates incident light and converts it into the polarization which has a predetermined polarization plane, among the polarization components contained in the said incident light, A first polarization element selectively passing through and reflecting another polarization component, and a second polarization element that transmits the polarization component having the predetermined polarization plane and absorbs the other polarization component, thereby providing the first polarization element and the first polarization component. By arranging two polarizing elements so that their transmission axes coincide with each other, and arranging the first polarizing element with respect to the second polarizing element upstream of the incident light on the optical path, cooling of the temperature of the polarizer is exceptionally cooled even when strong incident light is incident. It is possible to avoid effectively without using the device.

According to a feature of the invention of claim 2,

By forming the first polarization element and the second polarization element in close contact with each other, light loss due to reflection at each polarization element interface is avoided.

According to the characteristic of this invention of Claim 3,

In addition, by providing a condenser lens on the optical path and the upstream side of the incident light than the first polarization element, the optical path with the incident light to the polarizing device can be optimized.

According to a feature of the invention as set forth in claim 4,

By forming the condenser lens in close contact with the first polarization element, reflection at the interface between the lens and the polarization element may be minimized.

According to a feature of the invention as set forth in claim 5,

A phase of a liquid crystal layer for selectively reflecting the first polarized light element to one of circularly polarized light and left polarized light, and a light beam formed adjacent to the liquid crystal layer on an optical path of a light beam passing through the first polarized light element; By configuring the phase difference compensation plate to change the wavelength by about 1/4, linearly polarized light can be obtained by the phase difference compensation plate from the circularly polarized light that has passed through the liquid crystal layer.

According to a feature of the invention of claim 6,7,

A first liquid crystal layer that acts on the first polarized light beam of the three primary colors and selectively reflects one of the right-handed circularly polarized light component and the left-handed circularly polarized light component, and the three-primary color light beam The second liquid crystal layer which selectively acts to reflect one of the right-handed circularly polarized light component and the left-handed circularly polarized light component, and the third color of the three primary colors acts on the light beam, so that the right-handed circularly polarized light component and the left-handed circularly polarized light component It consists of a lamination structure in which a third liquid crystal layer selectively reflecting one side is laminated, and a phase difference compensation layer formed on one side of the lamination structure to change the phase of the light beam passing through the lamination structure by about a quarter wavelength. There is obtained a reflective polarizer that works effectively over all of the wavelength ranges.

According to a feature of the present invention as set forth in Claims 8 to 11, 43 to 47, 50 to 54, or 71 to 75, a UV blocking filter is provided on the incident side of the reflective polarizing element, whereby Deterioration can be avoided.

According to the characteristic of this invention of Claim 12-16,

A color separation optical system arranged in a light source, an optical path of an exit light beam emitted from the light source, and separating the light into a plurality of color light beams, and arranged in one optical path of each of the plurality of color light beams, respectively, to pass through the optical path. A plurality of light valves which spatially modulate the color light beams to form a modulated color light beam, and a color light beam which is inserted into an incident light path of the color light beams incident on one of the plurality of light valves and passes through the incident light path, respectively; A projection optical apparatus comprising a plurality of polarizing means for polarizing a light beam and a projection optical system for projecting a synthesized light beam formed by synthesizing the modulated color light beam on a screen, wherein at least one of the plurality of polarizing means is one of the incident color light beams. Among the polarization components of, a predetermined linear polarization component having the predetermined polarization plane is selectively passed through so that the linear polarization component By having a reflective polarization element that substantially reflects other polarization components, a compact and inexpensive projection optical device is obtained that does not require cooling of the polarization means while using a high output light source.

According to a feature of the present invention as described in claims 17 to 19,

At least one of the plurality of polarizing means selectively passes a predetermined linear polarization component having the predetermined polarization plane among the polarization components in the incident light beam on the side where the color light beam is incident, By providing an absorbing polarizing element that substantially absorbs the polarizing component, it is possible to use the absorbing polarizing element for color components having a small amount of light, thereby simplifying the construction of the projection optical device and increasing the degree of freedom of construction.

According to a feature of the invention as set forth in claim 20,

In addition, by providing a mask to block the aesthetic light on the optical path of stray light reaching the reflective polarizing element from the light source, even if the stray light accompanying the use of the combination of the high power light source and the reflective polarizing element is produced, Can be blocked to avoid damage.

In the features of the present invention described in claims 21 to 23, 39

The plurality of color light beams formed by the separation optical system include a first color light beam and a second color light beam, and the plurality of light valves act on the first light beam and the second color light beam. A second light valve acting, wherein said polarizing means includes first polarizing means acting on said first color light beam, and second polarizing means acting on said second color light beam; Among the second polarization means, in the case where at least the first polarization means includes the reflective polarization element, the transmission axis of the first and second polarization means and the second polarization means and the second polarization means are defined by the first polarization means. The second light valve is polarized by the reflective polarization element and formed so as to intersect with the polarization plane of stray light incident on the second polarized means. Beauty entering It is possible to block.

According to a feature of the invention as set forth in claims 24 to 28,

In addition, a stray light phase is provided in at least one of the first and second polarization means and installed in an optical path of stray light reflected by the reflective polarization element in the first polarization means and incident on the second polarization means. By forming the phase change means for changing the polarization, it is possible to effectively block stray light while freely setting the polarization axis directions of the first and second polarization means.

According to the characteristic of this invention of Claim 29-30,

By forming the first polarization means behind the reflective polarization element on the optical path of the first color light beam to include an absorption polarization element, the degree of deviation of the polarization light beam formed of the reflective polarization element can be further improved. .

According to a feature of the invention as set forth in claim 31,

Among the first polarizing means, by equipping a phase difference plate that changes the phase of light passing between the reflective polarizing element and the absorbing polarizing element, the transmission axis of the reflective polarizing element and the absorbing polarizing element must be matched. There is no need to increase the design freedom of the projection optics.

According to a feature of the invention as set forth in claims 32 to 33,

The polarization degree of the polarized light beam formed by the reflective polarization element may be further improved by forming the second polarization means on the optical path of the second color light beam and behind the reflective polarization element to include the absorption polarization element.

According to a feature of the invention as described in claims 34 and 35,

Of the second polarizing means, the phase shifting means for changing the phase of the light passing between the reflective piece and the element and the absorption type polarizing element is provided so that the transmission axis of the reflective type polarizing element and the absorption type polarizing element must be provided. There is no need for matching, which increases the design freedom of the projection optics.

According to a feature of the present invention as recited in Claims 35 and 35,

A projection optical apparatus by configuring one of the plurality of light valves to have a polarization axis intersecting the transmission axis of the corresponding polarizing means, and driving the one liquid crystal light valve in an inverted drive mode in which the driving mode of the other liquid crystal light valve is inverted The degree of freedom of construction is further improved.

According to a feature of the invention as set forth in claims 37 and 38,

By forming a phenomenon in which the reflected light is dispersed on the reflective surface of the reflective polarizing element constituting the first polarizing means, stray light formed by the reflective polarizing element can be made inconspicuous.

According to a feature of the invention as set forth in claims 41 and 42,

By forming the phase shifting means in close contact with the reflective polarization element or the absorption polarization element, light loss due to reflection can be reduced.

According to a feature of the invention as set forth in claims 39 and 40,

By arranging the reflective polarization element constituting the first polarization means inclined with respect to the optical path of the first color light beam, stray light formed of the reflective polarization element can be easily removed from the second light valve.

According to a feature of the invention as set forth in claims 55 to 69,

With a light source,

A plurality of condensing elements disposed in an optical path of the light beam emitted from the light source, each of which condenses the light beam;

A reflection type disposed in each optical path of the light beam passing through the plurality of light converging elements, selectively passing a polarization component having a predetermined polarization plane, and reflecting polarization components having a polarization plane other than the predetermined polarization plane. With polarizing elements,

A spatial modulation element disposed in an optical path of the passing light beam passing through the reflective polarization element and spatially modulating the passing light beam;

Reflecting means for reflecting, in the direction of the spatial modulation element, a reflected light beam which is formed in an optically ineffective region in which the light beam collected by the multi-condensing element does not reach and is a polarization component reflected by the reflective polarizing element;

Necessary polarization which is arranged in the optical path of the reflected light beam and is blocked by the reflective polarization element by an optical display device having polarization plane rotating means for rotating the polarization plane of the reflection light bin incident on the spatial modulation element. The brightness of the display on the screen can be improved.

According to a feature of the invention as set forth in claim 70,

By converting the unnecessary polarization component blocked by the reflective polarization element into the necessary polarization component, the brightness of the direct-view liquid crystal display device can be greatly improved.

Claims (75)

It is a polarizing device which irradiates incident light and converts it into the polarization which has a predetermined polarization plane, A first polarization element which selectively passes a polarization component having the predetermined polarization plane and reflects another polarization component among polarization components included in the incident light; A second polarization element that transmits a polarization component having the predetermined polarization plane and absorbs another polarization component, The first polarization element and the second polarization element are arranged so as to coincide with each transmission axis, In this case, the first polarizing element is configured to be positioned on the optical path, the upstream side of the incident light with respect to the second polarizing element. The method of claim 1, The first polarizing element and the second polarizing element are formed in close contact with each other. The method according to claim 1 or 2, And a condenser lens disposed on the upstream side of the optical path of incident light between the first polarizing element. The method of claim 3, The condenser lens is formed in close contact with the first polarization element. The method according to any one of claims 1 to 4, The first polarization element is a liquid crystal layer for selectively reflecting one of circularly polarized light in a right direction and circularly polarized light in a left direction, and an optical beam formed adjacent to the liquid crystal layer and passing through an optical path of a light beam passing through the first polarized light element. And a phase difference compensating plate for changing the phase of about 1/4 wavelength. The method of claim 1, The first polarization element acts on a light beam of three primary colors and selectively reflects one of a right polarization component and a left rotation circular polarization component and a light beam of three primary colors. A second liquid crystal layer which selectively acts to reflect one of the right-handed circularly polarized light component and the left-handed circularly polarized light component and the three primary colors of the third color light beam to act on the right-handed circularly polarized light component and the left-handed circularly polarized light component And a retardation structure in which a third liquid crystal layer that selectively reflects light is laminated, and a phase difference compensation layer formed on one side of the lamination structure to change a phase of the light beam passing through the red structure by about a quarter wavelength. Polarizer. The method of claim 1, The first polarization element acts on a light beam of three primary colors, so as to oppose a first liquid crystal layer selectively reflecting one of a circularly polarized component of right rotation and a circularly polarized component of left rotation, and a light beam of the first color. A first phase compensation layer that acts to change its phase by about a quarter wavelength and a second that selectively reflects one of the right-handed circularly polarized light component and the left-handed circularly polarized light component by acting on the second light beam of the three primary colors; A liquid crystal layer, a second phase difference compensation layer applied to the light beam of the second color to change its phase by about a quarter wavelength, a circularly polarized light component of right rotation and a circle of left rotation to act on the third color light beam of three primary colors; A third liquid crystal layer for selectively reflecting one side of the polarization component, and a third phase difference compensation layer which acts on the third color light beam and changes its phase by about a quarter wavelength. The method according to any one of claims 1 to 7, The first polarization element is a polarizing device, characterized in that provided with a filter for blocking the ultraviolet light on the incident side of the incident light. The method of claim 8, And said filter is a multilayer film and is an ultraviolet reflecting filter reflecting ultraviolet rays. The method according to claim 8 or 9, And said filter is a plurality of filter elements arranged in an optical path of said incident light and reflecting ultraviolet rays, respectively. The method of claim 10, Wherein one filter element is disposed to be inclined with respect to the other filter element among the plurality of filter elements. The method according to any one of claims 8 to 10, And said filter is formed in close contact with said first polarization element. With a light source, A color separation optical system disposed in an optical path of the output light beam emitted from the light source and separating the light into a plurality of color light beams; A plurality of light valves disposed in one optical path of the plurality of color light beams to form a modulated color light beam by spatially modulating the color light beam passing through the optical path; Polarizing means for polarizing the color light beams, which are inserted into the incident light paths of the color light beams incident on one of the plurality of light valves, and which pass through the incident light paths, on a predetermined polarization plane; A projection optical apparatus comprising a projection optical system for synthesizing the modulated color light beam and projecting the formed composite light beam onto a screen, At least one of the plurality of polarizing means selectively passes a predetermined linear polarization component having the predetermined polarization plane among the polarization components in the incident color light beam, and substantially reflects polarization components other than the linear polarization component. And a reflective polarizing element. The method of claim 13, Each of the plurality of polarizing means has the reflective polarizing element. The method according to claim 13 or 14, The polarizing means having the reflective polarizing element is configured to selectively pass the linearly polarized light component and to substantially absorb polarization components other than the linearly polarized light component in the advancing direction of the color light beam, behind the reflective polarizing element. And an absorption type polarizing element further disposed so that the transmission axis of the reflective polarization element and the transmission axis of the absorption polarization element substantially coincide with each other. The method according to any one of claims 13 to 15, And said reflective polarizing element comprises a reflective layer comprising liquid crystal and a phase difference layer for changing a phase of a color light beam laminated and passing on the reflective layer by about a quarter wavelength. The method of claim 13, At least one of the plurality of polarizing means selectively passes a predetermined linear polarization component having the predetermined polarization component among the polarization components in the incident light on the side where the color light beam is incident, and polarization components other than the polarization component. And an absorption type polarizing element that absorbs substantially. The method of claim 17, And said absorption type polarization component element is provided for the lowest illuminance among the color light beams separated by said color separation optical system. The method of claim 17, The absorption type polarizing element is provided for a blue light beam. The method according to any one of claims 13 to 19, And the projection optical device comprises a mask arranged to block the stray light on an optical path of stray light reaching the reflective polarizing element from a light source. The method according to claim 13, wherein The plurality of color light beams formed by the separation optical system include a first color light beam and a second color light beam, The plurality of light valves include a first light valve acting on the first color light beam, and a second light valve acting on the second color light beam, The polarizing means includes first polarizing means acting on the first color light beam and second polarizing means acting on the second color light polarizing beam, At least a first polarization means of said first and second polarization means comprises said reflective polarizing element, The first polarization means and the second polarization means intersect the transmission axis of the second polarization means with the polarization plane of stray light reflected by the reflective polarization element in the first polarization means and incident on the second polarization means. And a projection optical device, characterized in that it is formed to be. The method of claim 21, And the first polarizing means and the second polarizing means are formed such that the transmission axis of the first polarization means crosses the transmission axis of the second polarization means when the same directions of the passing light beams are compared. Device. The method of claim 21 or 22, When the first polarization means and the second polarization means compare the passing light beams in the same direction, the transmission axis of the first polarization means and the second transmission axis of the second polarization means are alternated at an angle of about 90 degrees. And a projection optical device, wherein the projection optical device is configured to The method of claim 2, At least one of the first and second polarization means is reflected by the reflective piece and the element in the first polarization means so that the first polarization means is disposed in an overwork of incident stray light and changes the phase of stray light passing therethrough. And a phase shifting means. The method of claim 24, And said phase change means changes the phase of light passing by about half wavelength. The method of claim 25, The phase shifting means is included in any one of the first polarization means and the second polarization means. The method of claim 24, The phase shifting means may be first and second quarter-wave retardation plates that respectively change the phase of light passing by about one-quarter wavelength, and the first polarization means comprises the first quarter-wave phase difference. And a second polarization means comprising said second quarter-wave retardation plate. The method of claim 24, The phase change means may be a 1/3 wavelength retardation plate for changing the phase of light passing by about 1/3 wavelength, and a 1/6 wavelength retardation plate for changing the phase of light passing by about 1/6 wavelength, The first polarization means includes one of the 1/3 wavelength retardation plate and the 1/6 wavelength retardation plate, and the second polarization means comprises the other of the 1/3 wavelength retardation plate and the 1/6 wavelength retardation plate. And a projection optical device comprising: The method according to any one of claims 21 to 23, wherein And the first polarization means includes an absorption type polarization element on an optical path of the first color light beam and behind the reflective polarization element. The method of claim 29, And the absorbing polarizing element has a transmission axis substantially coincident with the transmission axis of the reflective polarizing element. The method of claim 29, The first polarizing means further comprises a phase difference plate for changing the phase of light passing between the reflective polarizing element and the absorbing polarizing element. The method according to any one of claims 21 to 23, wherein And the second polarization means includes an absorption type polarization element on an optical path of the second color light beam and behind the reflective polarization element. 33. The method of claim 32, And the absorption type polarizing element has a transmission axis substantially coincident with the transmission axis of the reflective polarization element. 33. The method of claim 32, And said second polarizing means further comprises phase changing means for changing a phase of light passing between the reflective polarizing element and the absorbing polarizing element. The method of claim 13, One of the plurality of light valves has a polarization axis intersecting the transmission axis of the corresponding polarization means. 36. The method of claim 35 wherein And the one liquid crystal light valve is driven in an inverted drive mode in which the driving mode of the other liquid crystal light valve is inverted. The method of claim 21, The reflective type polarizing element constituting the first polarizing means has an irregular penetrating scattering of reflected light on its reflection surface. The method of claim 21, The reflection type polarizing element constituting the first polarization means has a regular shape for dispersing reflected light on its reflection surface. The method according to any one of claims 21 to 26, The first polarizing means and the second polarizing means exist on the trajectories of the respective color light beams separated from each other by the same half mirror constituting the separation optical system, and are arranged adjacent to each other. Device. The method according to any one of claims 21 to 23 or 39, A first phase change means and a second phase change means are disposed on an optical path of the first polarization means and the second polarization means, respectively, and the first phase change means and the second phase change means are provided with respect to the light passing through. And adding each of the first and second phase shifts which, when summed, becomes a phase shift by about one-half wavelength, respectively. The method according to any one of claims 24-28 or 31, 34, 39, 40, And said phase shifting means is formed in close contact with said reflective polarizing element. The method of claim 31 or 34, The retardation plate is formed in close contact with the reflective polarizing element and the absorption polarizing element. The method according to any one of claims 31 to 42, And said reflective polarizing element is provided with a filter for blocking ultraviolet rays on the side on which the exiting light beam from said light source is incident. The method of claim 43, The filter is a multilayer optical film, and the projection optical device, characterized in that the ultraviolet reflector for reflecting the filter. The method of claim 43 or 44, And said filter is a plurality of filter elements arranged in an optical path of said incident light and reflecting ultraviolet rays, respectively. The method of claim 45, One of said plurality of filter elements is arranged obliquely with respect to another filter element. The method of any one of claims 43-46, And said filter is formed in close contact with said first polarization element. With a light source, A color separation optical system arranged in an optical path of the output light beam emitted from the light source, and separating the plurality into color light beams; A plurality of light valves arranged in one optical path of the plurality of color light beams to spatially modulate the color light beams passing through the optical path to form a modulated color light beam; A plurality of polarization means each inserted into an incident light path of the color light beam incident on one of the light valves to polarize the color light beam passing through the incident light path on a predetermined polarization plane; A projection optical device comprising a projection optical system for projecting a synthesized light beam formed by synthesizing the modulated color light beam on a screen, At least one of the plurality of polarizing means selectively reflects a predetermined linear polarization component having the predetermined polarization plane among the polarization components in the incident color light beam and substantially reflects polarization components other than the linear polarization component. And a type polarizing element inclined with respect to the optical path of the incident color light beam. The method of claim 48, And said inclined reflective polarizing element is set to an inclination angle at which stray light formed by said reflective polarizing element with respect to the optical path of said incident color light beam is out of said second light valve. The method of claim 48 or 49, The reflection type polarizing element includes a filter for blocking ultraviolet rays on the side where the light beam emitted from the light source is incident. 51. The method of claim 50, The filter is a multilayer optical film, and the projection optical device, characterized in that the ultraviolet reflector for reflecting the filter. The method of claim 50 or 51, And said filter is a plurality of filter elements arranged in an optical path of said incident light and reflecting ultraviolet rays, respectively. The method of claim 52, wherein A projection optical device according to claim 1, wherein one filter element is disposed to be inclined with respect to the other first filter element. The method of any one of claims 50-53, And said filter is formed in close contact with said first polarizing element. With a light source, A plurality of condensing elements disposed in an optical path of the light beam emitted from the light source and condensing the light beam, respectively; Disposed in each optical path of the light beam passing through the plurality of light collecting elements to selectively pass a polarization component having a predetermined polarization plane, and reflect the polarization component having a polarization component having a polarization plane other than the predetermined polarization plane A reflective polarization element, A spatial modulation element disposed in an optical path of the passing light beam passing through the reflective polarization element and spatially modulating the passing light beam; Reflecting means for reflecting in the direction of the spatial modulation element a reflected light beam which is formed in an optically ineffective region in which the light beam collected by the multi-condensing element does not reach and is a polarization component reflected by the reflective polarizing element; And polarizing plane rotating means arranged in the optical path of the reflected light beam to rotate the polarization plane of the reflected light beam incident on the spatial modulation element. The method of claim 55, And the reflective polarization element is formed to be inclined with respect to the optical axes of the plurality of condensing elements so that the reflected light beam is incident on the reflecting means. The method of claim 55 or 56, wherein And each of said condensing elements is a convex lens. The method of claim 55 or 56, wherein And each of said light collecting elements is a cylindrical lens. The method of claim 58, The cylindrical lens is formed asymmetrically on only one side of the optical axis. The method of any one of claims 55-59, The plurality of light collecting elements are disposed so that the optical axis is inclined with respect to the optical path of the incident light. 61. The method of any of claims 55-60, And the reflective polarization element carries a scattering layer for scattering the reflected light beam. 63. The method of any of claims 55-61, And an optical element for converting the light beams collected by the plurality of light collecting elements into substantially parallel light between the reflective polarization element and the spatial modulation element. 63 or 62 And said polarization plane rotating means is a phase difference compensating plate arranged to be arranged in the optical path of the light beam reflected by said reflecting means to change the phase of the light beam passing through about 1/2 wavelength. 63. The method of any of claims 55-62, And said polarizing plane rotating means is arranged between said reflective polarizing element and said reflecting means and comprises a phase difference compensating plate for changing the phase of the light beam passing by about a quarter of a wavelength. 65. The method of claim 64, The plurality of light collecting elements form an integral optical member coupled to each other, and wherein the reflective polarizing element and the phase difference compensating plate cover an area corresponding to the optical member, and each extends continuously. Device. The method of any one of claims 55-63, And each of the plurality of light collecting elements is formed of a sidewall, and a reflective film is formed on the sidewall. The method of any one of claims 55-66, And the optical display device further comprising a projection optical system for projecting a light beam passing through the spatial modulation element on a screen. The method of claim 67, And forming a light processing apparatus in which the plurality of condensing elements, the reflective polarizing element, the reflecting means and the polarizing plane rotating means convert a substantially all energy of incident light into a polarized light beam having a desired polarizing plane, and the projection The optical apparatus has a color separation optical system for separating the light beam formed by the light source into a plurality of color light beams, the spatial modulating element is provided for each of the plurality of color light beams, and the light processing apparatus comprises the light source and the light processing An optical display device provided between the devices. The method of claim 67, The plurality of light converging elements, the reflective polarizing element, the reflecting means, and the polarizing plane rotating means form an optical processing device for converting substantially all energy of incident light into a polarized light beam having a desired polarizing plane; And the projection optical device comprises a color separation optical system for separating the light beam formed by the light source into a plurality of color light beams, the spatial modulation element being provided for each of the plurality of color light beams, and the light processing device And each of the spatial modulation elements of the optical display device. The method of any one of claims 55-66, And the optical display device is a direct view display device. The method of claim 55 or 70, The reflective polarizing element includes a filter for blocking ultraviolet rays on the side where the exiting light beam from the light source enters. The method of claim 72, And said filter is a multilayer film and is an ultraviolet reflecting filter that reflects ultraviolet rays. The method of claim 71 or 72, wherein And said filter is made up of a plurality of filter elements arranged in an optical path of said incident light and reflecting ultraviolet rays, respectively. The method of claim 73, One filter element among the said plurality of filter elements is arrange | positioned inclined with respect to the other filter element, The optical display apparatus characterized by the above-mentioned. The method of any one of claims 71-74, wherein And the filter is formed in close contact with the first polarization element.