JP4337826B2 - Lighting device and projector - Google Patents

Description

  The present invention relates to a lighting device and a projector.

FIG. 9 is a diagram for explaining a conventional projector 1000a and illumination device 100a. FIG. 9A is a diagram showing an optical system of a conventional projector 1000a, and FIG. 9B is a diagram showing a main part of an illumination device 100a used in the conventional projector 1000a.
FIG. 10 is a diagram for explaining display shadows in the conventional projector 1000a.

  As shown in FIG. 9A, the conventional projector 1000a separates the illumination device 100a and the illumination light flux from the illumination device 100a into three color lights of red light, green light, and blue light, and guides them to the illuminated area. The color separation light guide optical system 200, the three liquid crystal devices 400R, 400G, and 400B that modulate the illumination light beams from the color separation light guide optical system 200, and the three liquid crystal devices 400R, 400G, and 400B that are modulated respectively. A cross dichroic prism 500 that combines color lights, and a projection optical system 600 that projects an illumination light beam synthesized by the cross dichroic prism 500 onto a projection surface such as a screen SCR (see FIG. 10) are provided.

  The illumination device 100a includes a light source device 110a that emits a substantially parallel illumination light beam toward the illuminated region side, and a first plurality of first small lenses that divide the illumination light beam from the light source device 110a into a plurality of partial light beams. The light is emitted from a lens array 130a, a second lens array 140a having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array 130a, and a plurality of second small lenses of the second lens array 140a. A polarization conversion element 150a for converting each partial light beam into linearly polarized light, and a superimposing lens 160a for superimposing each partial light beam from the polarization conversion element 150a in the illuminated region. The light source device 110a includes an arc tube 112 (not shown) and a paraboloid reflector 114a that reflects light from the arc tube 112 toward an illuminated area. In such an illuminating device 100a, the outline shape of the first small lens of the first lens array 130a is set to be similar to the shape of the illuminated region, and each first small lens of the first lens array 130a is set. Are superimposed on the illuminated area by the second lens array 140a and the superimposing lens 160a. That is, the first small lens of the first lens array 130a and the illuminated area are conjugate.

  In the conventional projector 1000a, as shown in FIG. 9B, the first small lens in the first lens array 130a is such that each illumination light beam from the first lens array 130a is only the effective incident portion 153a in the polarization conversion element 150a. So that the light utilization efficiency in the projector is improved (for example, refer to Patent Document 1). .

  However, in the conventional projector 1000a, there is a step S (see FIG. 9B) between the decentered first small lenses of the first lens array 130a. Since the first small lens and the illuminated area are conjugate, shadows, irregular reflections, and the like due to such a level difference S significantly affect the illuminated area. Further, since the step S exists, surface sagging (the corner portion of the lens periphery is not formed at a predetermined angle but is formed in a curved shape) occurs during the manufacture of the first lens array 130a, and the surface is covered. In some cases, the periphery of the illumination area becomes dark. As a result, as shown in FIG. 10, there is a problem that display shadows are generated in the outer peripheral portion of the display area.

For this reason, another illumination device 100b (not shown) in which the first lens array has no step has been proposed (see, for example, Patent Document 1).
FIG. 11 is a diagram showing a main part of another illumination device 100b. As shown in FIG. 11, the other illumination device 100 b can suppress the problem that a display shadow is generated in the outer peripheral portion of the display area because there is no step in the first lens array 130 b.

JP 2002-23108 A

  However, the projector is required to further improve the light use efficiency and further reduce the cost.

  SUMMARY An advantage of some aspects of the invention is that it provides a lighting device capable of further improving the light use efficiency and further reducing the cost of a projector. Moreover, it aims at providing the projector provided with such an illuminating device.

The illuminating device of the present invention includes: (1) a light source device that emits an illuminating light beam toward the illuminated region;
A first lens array having a plurality of first small lenses for dividing an illumination light beam emitted from the light source device into a plurality of partial light beams;
A lighting device having at least a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array;
The first lens array and the second lens array are formed integrally with one translucent member,
The plurality of first small lenses are aligned eccentrically in the horizontal direction for each row, and the optical axis and geometric center position of each of the plurality of first small lenses constituting the same row are horizontal. In the same direction,
The plurality of first small lenses are not decentered in the vertical direction, and the thickness of the first small lens is adjusted for each row so as to reduce a step at the boundary of the rows,
The plurality of second small lenses are eccentric in the vertical direction for each row, and the optical axis and geometric center position of each of the plurality of second small lenses constituting the same row are in the vertical direction. In the same position,
The plurality of second small lenses are not decentered in the lateral direction, and the thickness of the second small lenses is adjusted for each row so as to reduce a step at a boundary portion of the rows. To do.
(2) a light source device that emits an illumination light beam toward the illuminated region side;
A first lens array having a plurality of first small lenses for dividing an illumination light beam emitted from the light source device into a plurality of partial light beams;
A lighting device having at least a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array;
The first lens array and the second lens array are formed integrally with one translucent member,
The plurality of first small lenses are aligned eccentrically in the vertical direction for each row, and the optical axis and geometric center position of each of the plurality of first small lenses constituting the same row are in the vertical direction. In the same position,
The plurality of first small lenses are not decentered in the lateral direction, and the thickness of the first small lens is adjusted for each row so as to reduce a step at a boundary portion of the rows,
The plurality of second small lenses are aligned eccentrically in the horizontal direction for each row, and the optical axis and geometric center position of each of the plurality of second small lenses constituting the same row are horizontal. In the same direction,
The plurality of second small lenses are not decentered in the vertical direction, and the thickness of the second small lenses is adjusted for each row so as to reduce a step at a boundary portion of the rows. And
Further, the following configuration may be used.
A light source device that emits an illumination light beam toward the illuminated region; a first lens array that includes a plurality of first small lenses for dividing the illumination light beam emitted from the light source device into a plurality of partial light beams; A second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the lens array, and each partial light beam emitted from the plurality of second small lenses of the second lens array is illuminated. A superimposing lens for superimposing in a region, wherein the plurality of first small lenses are decentered along a certain direction, and the plurality of second small lenses are in the certain direction or the certain direction The first lens array and the second lens array are formed integrally with one translucent member.

  For this reason, according to the illumination device of the present invention, the first lens array and the second lens array are formed integrally with one translucent member, whereby two interfaces (the first lens) between the air and the optical member are formed. Since the light emitting surface of the array and the light incident surface of the second lens array can be eliminated, unnecessary reflection can be reduced, and light utilization efficiency can be improved. Further, since the number of optical members can be reduced (from two (first lens array and second lens array) to one (translucent member)), further cost reduction can be achieved.

  As a material for the translucent member, for example, quartz glass, hard glass, crystallized glass, sapphire, crystal, plastic, and the like can be suitably used.

  In the illumination device of the present invention, the first lens array is a first lens array in which a thickness of each first small lens is adjusted so as to reduce a step at a boundary portion between the first small lenses, The second lens array is preferably a second lens array in which a thickness of each second small lens is adjusted so as to reduce a step at a boundary portion between the second small lenses.

  When the first lens array and the second lens array are integrally formed as a translucent member as in the present invention, the thickness is larger than that of a normal lens or the like. When the translucent member in which the first lens array and the second lens array of the present invention are integrally formed is formed by, for example, a press method, a boundary portion between each first small lens of the first lens array, and If the step at the boundary between the second small lenses of the second lens array is large, the mold separation becomes worse. As a result, surface sagging and chipping easily occur, and there is a problem that it is impossible to manufacture a lens array having a desired shape as the first lens array and the second lens array.

  On the other hand, according to the illumination device of the present invention, the first lens array is a first lens array in which the thickness of each first small lens is adjusted so as to reduce the step at the boundary between the first small lenses. The second lens array is a second lens array in which the thickness of each second small lens is adjusted so as to reduce the step at the boundary portion between each second small lens. The problem that a lens array having a desirable shape as a two-lens array cannot be manufactured is also solved.

  By the way, when the plurality of first small lenses or the plurality of second small lenses are not decentered, of course, it is easy to reduce the step on the entire surface of the first lens array and the second lens array. When one small lens or a plurality of second small lenses are decentered both along the vertical direction and along the horizontal direction, the level difference is reduced on the entire surface of the first lens array and the second lens array. Since it is not easy, it is not easy to manufacture a lens array having a desired shape as the first lens array and the second lens array.

  On the other hand, according to the illumination device of the present invention, as described above, both the plurality of first small lenses and the plurality of second small lenses are decentered only in any one of the vertical and horizontal directions. Therefore, it is possible to reduce the step on the entire surface of the first lens array and the second lens array, and it is possible to manufacture a lens array having a desirable shape as the first lens array and the second lens array.

  In this specification, the “small lens thickness” means the maximum distance between the light incident surface and the light exit surface of the small lens.

  In the illumination device of the present invention, a polarization conversion element that converts an incident light beam into one type of linearly polarized light and emits it between the second lens array and the superimposing lens, and the polarization conversion element includes: It has an effective incident part, and at least a part of the first small lens and at least a part of the second small lens are decentered so that the partial light beam enters the effective incident part of the polarization conversion element. Is preferred.

  With this configuration, the illumination device of the present invention is an illumination device suitable for a projector including an electro-optic modulation device of a type that modulates polarized light like a liquid crystal device.

  In the illuminating device of the present invention, the light source device is a light source device that emits an illumination light beam that is substantially parallel to the illuminated region side, and the decentering direction of the plurality of first small lenses and the plurality of second small lenses. The eccentric direction is preferably the same direction.

  In the case of an illuminating device having a polarization conversion element, it is necessary that the image of the first small lens is incident only on the area of the effective incident portion of the polarization conversion element so that the light utilization efficiency does not decrease. For this reason, it is important to better separate the image of the first small lens along a certain direction of the first lens array, for example, the lateral direction, as compared with the case of the illumination device having no polarization conversion element.

Therefore, in the illumination device of the present invention, when the plurality of first small lenses are decentered along a certain direction (for example, the lateral direction) of the first lens array, each partial light beam from the first lens array is the first. The light is directed outward toward the second lens array in a plane parallel to the eccentric direction of the lens array and parallel to the illumination optical axis.
As a result, according to the illumination device of the present invention, the image of the first small lens can be satisfactorily separated along the eccentric direction (for example, the lateral direction) of the first lens array, and the illumination having the polarization conversion element A decrease in light utilization efficiency in the case of the apparatus can be minimized.

In the illuminating device of the present invention, the partial light flux from the first lens array becomes light traveling outward in a plane parallel to the eccentric direction (for example, the lateral direction) of the first lens array and parallel to the illumination optical axis. However, since the second lens array needs to make this light parallel to the illumination optical axis, the second lens array is parallel to the eccentric direction of the first lens array and along the opposite direction (for example, the lateral direction). The plurality of second small lenses are decentered.
In the illumination device of the present invention, in order to reduce a step at the boundary between the first small lenses, a plurality of first lenses are arranged along a direction (for example, the vertical direction) other than a certain direction of the first lens array. The small lens is not decentered. Further, in order to reduce the step at the boundary between the second small lenses, the plurality of second small lenses are not decentered along a direction (for example, the vertical direction) other than a certain direction of the second lens array.
As a result, in the illumination device of the present invention, when the decentering direction of the plurality of first small lenses and the decentering direction of the plurality of second small lenses are the same direction, the dimension of the second lens array in the decentering direction (for example, lateral direction) (Direction dimension) is larger than the eccentric dimension (for example, lateral dimension) of the first lens array, and the dimension (for example, vertical dimension) in the direction orthogonal to the eccentric direction of the second lens array is eccentric direction of the first lens array. It is substantially the same as the dimension in the direction orthogonal to (for example, the vertical dimension).

  In the illuminating device of the present invention, each of the plurality of first small lenses has a substantially rectangular shape having a long side and a short side, and the decentering direction of the plurality of first small lenses and the plurality of first small lenses. The decentering direction of the two small lenses is preferably a direction orthogonal to the long side direction of each first small lens.

  For example, when the illuminated area of the illumination device of the present invention has a horizontally long shape, the first small lens also has a horizontally long external shape. For this reason, in the illumination device, it is also important to favorably separate the image of the first small lens along the longitudinal direction of the first lens array.

Therefore, in the illumination device of the present invention, along the direction orthogonal to the long side direction of the first small lens of the first lens array (for example, the vertical direction if the outer shape of the first small lens is a horizontally long shape). The plurality of first small lenses are decentered. Therefore, each partial light beam from the first lens array is in a direction orthogonal to the long side direction of the first small lens of the first lens array (for example, the vertical direction if the outer shape of the first small lens is a horizontally long shape). ) In the plane parallel to the illumination optical axis and toward the second lens array.
As a result, an image of the first small lens is taken along a direction orthogonal to the long side direction of the first small lens of the first lens array (for example, the vertical direction if the outer shape of the first small lens is a horizontally long shape). The illumination device of the present invention can be separated satisfactorily. In the illumination device of the present invention, each partial light beam is favorably incident on each second small lens of the second lens array, and the illuminated region (for example, the illuminated light of the electro-optic modulation device) is obtained. It will be more suitable for the shape of the area.

  In the illuminating device of the present invention, the light source device is a light source device that emits an illuminating light beam that diverges toward the illuminated region, and the eccentric direction of the plurality of first small lenses and the eccentricity of the plurality of second small lenses. The direction is preferably an orthogonal direction.

With this configuration, the light source device emits an illuminating light beam that diverges toward the illuminated region, while the decentering direction of the first lens array is decentered only along a certain direction (for example, the lateral direction). Therefore, each partial light beam from the first lens array becomes parallel light parallel to the illumination optical axis in a plane parallel to the eccentric direction (for example, the lateral direction) of the first lens array and parallel to the illumination optical axis. In a plane parallel to the direction orthogonal to the decentering direction of one lens array (for example, the vertical direction) and parallel to the illumination optical axis, the light travels outward toward the second lens array.
Each partial light beam from the first lens array becomes light that travels outward in a plane that is parallel to a direction orthogonal to the eccentric direction of the first lens array (for example, the vertical direction) and parallel to the illumination optical axis. Since the lens array needs to make this light parallel to the illumination optical axis, the decentering direction of the second lens array is a plurality of second directions along a direction (for example, the vertical direction) orthogonal to the decentering direction of the first lens array. The small lens is decentered.
For this reason, according to the illuminating device of the present invention, it is possible to satisfactorily separate the image of the first small lens along two orthogonal directions in the illuminating device, and in the case of the illuminating device having the polarization conversion element. A decrease in light utilization efficiency can be minimized.

  In the illumination device of the present invention, the first small lens of the first lens array is decentered only in a certain direction in order to reduce the step at the boundary between the small lenses, and the second lens array The two small lenses are also decentered only in a certain direction. However, since the illumination light beam that diverges from the light source device to the illuminated region side is emitted and the eccentric direction of the first small lens and the eccentric direction of the second small lens are orthogonal to each other, they are orthogonal to each other in the illumination device. The image of the first small lens can be separated in two directions, and the light beam emitted from the translucent member can be parallel light parallel to the illumination optical axis.

  As a result, in the illumination device of the present invention, the eccentric directions of the plurality of first small lenses are along the lateral direction of the translucent member, and the eccentric directions of the plurality of second small lenses are the longitudinal direction of the translucent member. , The dimension of the second lens array in the eccentric direction (for example, the vertical dimension) is larger than the dimension in the direction orthogonal to the eccentric direction of the first lens array (for example, the vertical dimension). The dimension in the direction orthogonal to the eccentric direction of the array (for example, lateral dimension) is substantially the same as the dimension in the eccentric direction of the first lens array (for example, lateral dimension). Further, if the decentering direction of the plurality of first small lenses is along the longitudinal direction of the translucent member and the decentering direction of the plurality of second small lenses is along the lateral direction of the translucent member, The dimension of the two lens arrays in the eccentric direction (for example, the lateral dimension) is larger than the dimension in the direction orthogonal to the eccentric direction of the first lens array (for example, the lateral dimension), and the dimension in the direction orthogonal to the eccentric direction of the second lens array. The dimension (for example, the longitudinal dimension) is substantially the same as the eccentric dimension (for example, the longitudinal dimension) of the first lens array.

  In the illumination device of the present invention, the light source device that emits a substantially parallel illumination light beam toward the illuminated region is reflected by the arc tube, the ellipsoidal reflector that reflects light from the arc tube, and the ellipsoidal reflector. A light source device having a concave lens that makes light substantially parallel light is preferable.

  In the illumination device of the present invention, the light source device that emits the illumination light beam that diverges toward the illuminated region is reflected by the arc tube, the elliptical reflector that reflects light from the arc tube, and the elliptical reflector. It is preferable that the light source device has a concave lens that makes divergent light whose center axis is the illumination optical axis.

  By comprising in this way, a more compact light source device is realizable compared with the light source device using a paraboloid reflector.

  In the illuminating device of the present invention, it is preferable that the arc tube is provided with an auxiliary mirror that reflects the light emitted from the arc tube toward the illuminated area toward the arc tube.

  With this configuration, light emitted from the arc tube toward the illuminated area is reflected toward the arc tube, so that the elliptical reflector is sized to cover the illuminated area side end of the arc tube. Therefore, the size of the ellipsoidal reflector can be reduced, and the projector can be reduced in size. This also means that the size of the first lens array, the size of the second lens array, the size of the polarization conversion element, the size of the superimposing lens, etc. can be further reduced. Miniaturization can be achieved.

  The projector according to the present invention includes an illumination device, an electro-optic modulation device that modulates an illumination light beam from the illumination device according to image information, and a projection optical system that projects the illumination light beam modulated by the electro-optic modulation device. It is a projector provided, The said illuminating device is the illuminating device of this invention, It is characterized by the above-mentioned.

  For this reason, the projector of the present invention is a projector capable of further improving the light use efficiency and further reducing the cost.

  In the projector according to the aspect of the invention, the electro-optic modulation device includes a plurality of electro-optic modulation devices that modulate each of the plurality of color lights according to image information, and separates the illumination light beam from the illumination device into the plurality of color lights. It is preferable to further include a color separation light guide optical system that leads to each of the plurality of electro-optic modulation devices, and a cross dichroic prism that synthesizes the respective color lights modulated by the plurality of electro-optic modulation devices.

  With such a configuration, a projector capable of further improving the light use efficiency and further reducing the cost can be a full color projector having excellent image quality (for example, a three-plate type).

  Hereinafter, an illumination device and a projector according to the present invention will be described based on embodiments shown in the drawings.

Embodiment 1
FIG. 1 is a diagram for explaining an illumination device 100 and a projector 1000 according to the first embodiment. FIG. 1A is a diagram illustrating an optical system of the projector 1000, FIG. 1B is a diagram of a translucent member 120 used in the projector 1000, as viewed from above, and FIG. It is the figure which looked at the translucent member 120 used for 1 from the side.
FIG. 2 is a diagram for explaining the polarization conversion element 150. 2A is a view of a part of the polarization conversion element 150 as viewed from above, and FIG. 2B is a perspective view of the polarization conversion element 150.

  FIG. 3 is a diagram for explaining the effect of the lighting apparatus 100 according to the first embodiment. FIG. 3A is a diagram illustrating an image of the first small lens 132 on the light incident surface of the polarization conversion element 150 in the first embodiment, and FIG. 3B is a light incidence of the polarization conversion element 150c in the comparative example. It is a figure which shows the image of the 1st small lens on a surface. An illumination device 100c (not shown) according to a comparative example is an illumination device having small lenses in which neither the first lens array nor the second lens array is decentered.

  In the following description, the three directions orthogonal to each other are defined as the z-axis direction (illumination optical axis 100ax direction in FIG. 1A) and the x-axis direction (parallel to the paper surface in FIG. And a direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis.

  As shown in FIG. 1A, the projector 1000 according to the first embodiment separates the illumination device 100 and the illumination light flux from the illumination device 100 into three color lights of red, green, and blue, and guides them to the illumination area. The three color liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices that modulate the light-separated color separation light guide optical system 200 and the three color lights separated by the color separation light guide optical system 200 according to image information. The cross dichroic prism 500 that combines the color lights modulated by the three liquid crystal devices 400R, 400G, and 400B, and the light that is combined by the cross dichroic prism 500 is projected onto a projection surface such as a screen SCR (not shown). And a projection optical system 600.

  As shown in FIGS. 1A to 1C, the illumination device 100 according to the first embodiment is emitted from the light source device 110 that emits an illumination light beam that is substantially parallel to the illuminated region side, and the light source device 110. The first lens array 130 having a plurality of first small lenses 132 for dividing the illumination light beam to be divided into a plurality of partial light beams, and a plurality of second small lenses corresponding to the plurality of first small lenses 132 of the first lens array 130 A translucent member 120 integrally formed with a second lens array 140 having 142, a polarization conversion element 150 that aligns an illumination light beam emitted from the light source device 110 with a non-uniform polarization direction into one type of linearly polarized light, It has a superimposing lens 160 for superimposing each partial light beam emitted from the polarization conversion element 150 in the illuminated region.

The light source device 110 includes a parabolic reflector 114 and an arc tube 112 having a light emission center near the focal point of the parabolic reflector 114.
The arc tube 112 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion.
The parabolic reflector 114 reflects light emitted from the light emission center of the arc tube 112 and emits it as an illumination light beam parallel to the illumination optical axis 100ax.

The illumination light beam emitted from the parabolic reflector 114 is incident on the translucent member 120. The translucent member 120 is configured such that the illumination light beam enters from each first small lens 132 of the first lens array 130 and is divided into a plurality of partial light beams according to the number of the first small lenses 132. . Each partial light beam emitted from the first lens array 130 is emitted from the second lens array 140 having the second small lenses 142 respectively corresponding to the first small lenses 132 after passing through the translucent member 120. The
Details of the translucent member 120 will be described later.

Each partial light beam emitted from the second lens array 140 is condensed in the vicinity of the polarization separation layer 152 of the polarization conversion element 150 that aligns light in a random polarization direction with one kind of linearly polarized light.
As shown in FIG. 2A, the polarization conversion element 150 has a configuration in which polarization separation layers 152 and reflection layers 154 that are inclined with respect to the illumination optical axis 100ax are alternately arranged. The polarization separation layer 152 transmits one polarized light beam among the P-polarized light beam and S-polarized light beam included in each partial light beam, and reflects the other polarized light beam. The other polarized light beam reflected by the polarization separation layer 152 is bent by the reflective layer 154 and emitted in the emission direction of the one polarized light beam, that is, the direction along the illumination optical axis 100ax. A phase difference plate 156 is disposed on the light exit surface of the polarization conversion element 150, and one of the emitted polarized light beams is polarized and converted by the phase difference plate 156, and the polarization directions of almost all the polarized light beams are aligned. It is done.
In addition, on the light incident surface side of the polarization conversion element 150, as shown in FIG. 2B, a rectangular plate is used so that light is incident only on the area of the effective incident portion 153 corresponding to the polarization separation layer 152. A light shielding plate 157 provided with an opening 158 and a light shielding part 159 is disposed in the body.
By using such a polarization conversion element 150, it is possible to align the illumination light beam emitted from the light source device 110 with linearly polarized light in approximately one direction, so that the light used in the liquid crystal devices 400R, 400G, and 400B is used. Efficiency can be improved.

  A plurality of partial light beams whose polarization directions are aligned by the polarization conversion element 150 enter the superimposing lens 160 and are superimposed so as to overlap each other on the illuminated areas of the liquid crystal devices 400R, 400G, and 400B described later. .

The light beam emitted from the superimposing lens 160 is bent by the reflection mirror 170 and enters the color separation light guide optical system 200.
The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270.

  The dichroic mirrors 210 and 220 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that transmits a red light component and reflects other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that reflects the green light component and transmits the blue light component.

  The red light component transmitted through the dichroic mirror 210 is bent by the reflection mirror 230 and enters the liquid crystal device 400R for red light through the condenser lens 280R. On the other hand, of the green light component and the blue light component reflected by the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220 and enters the liquid crystal device 400G for green light through the condenser lens 280G. The blue light component transmitted through the dichroic mirror 220 is condensed and bent by the incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250, and is incident on the blue light liquid crystal device 400B through the condensing lens 280B. To do. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 have a function of guiding the blue light transmitted through the dichroic mirror 220 to the blue light liquid crystal device 400B. Note that the condensing lenses 280R, 280G, and 280B provided in the preceding stage of the light paths of the respective color lights of the liquid crystal devices 400R, 400G, and 400B are configured to convert the partial light beams emitted from the second lens array 140 of the translucent member 120 to the respective portions. It is provided in order to convert the light into a light substantially parallel to the principal ray of the light beam.

  The reason that the incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 are provided in the optical path of blue light is that the length of the optical path of blue light is longer than the length of the optical paths of other color lights. For this reason, a decrease in light use efficiency due to light divergence or the like is prevented. The projector 1000 according to the first embodiment has such a configuration because the length of the optical path of the blue light is long, but the length of the optical path of the red light is increased to make the incident side lens 260, the relay lens 270, and A configuration in which the reflection mirrors 240 and 250 are used in the optical path of red light is also conceivable.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the incident illumination light beam according to image information to form a color image, and are the illumination target of the illumination device 100. Although not shown, incident side polarizing plates are interposed between the condenser lenses 280R, 280G, 280B and the liquid crystal devices 400R, 400G, 400B, respectively, and the liquid crystal devices 400R, 400G, 400B Between the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, incident side polarization is performed according to a given image signal using a polysilicon TFT as a switching element. The polarization direction of one type of linearly polarized light emitted from the plate is modulated.
As the liquid crystal devices 400R, 400G, and 400B, a liquid crystal device having an image forming region having a planar shape of “longitudinal dimension along the y-axis direction: lateral dimension along the x-axis direction = 3: 4 rectangle”. Used.

The cross dichroic prism 500 is an optical element that forms a color image by synthesizing optical images modulated for the respective color lights emitted from the emission-side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.
The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form a large screen image on the screen.

The illumination device 100 according to the first embodiment includes a translucent member 120 in which a first lens array 130 and a second lens array 140 are integrally formed.
Hereinafter, the translucent member 120 in the illumination device 100 according to the first embodiment will be described in detail.

  As described above, the translucent member 120 includes the first lens array in which the first small lenses 132 having a rectangular outline are arranged in a matrix in the vertical direction (y-axis direction) and the horizontal direction (x-axis direction). 130 and a second lens array 140 in which second small lenses 142 corresponding to the first small lenses 132 are arranged in a matrix in the vertical direction (y-axis direction) and the horizontal direction (x-axis direction) face each other. And an optical element integrally formed by, for example, a press method. In the following embodiments, the vertical direction (y-axis direction) will be described as a column, and the horizontal direction (x-axis direction) will be described as a row.

  As a material of the translucent member 120, for example, quartz glass, hard glass, crystallized glass, sapphire, crystal, plastic, and the like can be suitably used.

The translucent member 120 divides the illumination light beam from the light source device 110 into a plurality of partial light beams, and each partial light beam is near the position of the polarization separation layer 152 (see FIG. 2A) of the polarization conversion element 150. It is comprised so that it may condense. Therefore, a condensed image by each partial light beam is formed near the position of the polarization separation layer 152. These condensed images are images of the light emitting portion in the arc tube 112.
Here, if the light emitting part of the arc tube is an ideal point light source and the illumination device is an ideal optical system free of design errors and assembly errors, the position of the polarization separation layer of the polarization conversion element A condensed image formed in the vicinity becomes a point. However, actually, since the light emitting portion of the arc tube 112 has a certain size, the condensed image formed near the position of the polarization separation layer 152 also has a certain size. Therefore, the size of the effective incident portion 153 for effectively making light incident on the polarization separation layer 152 is set so that these condensed images can enter the polarization separation layer 152 effectively. That is, the partial light beam incident on the effective incident portion 153 becomes one type of linearly polarized light and is emitted from the polarization conversion element 150.

  In the translucent member 120 in the illumination device 100 according to the first embodiment, the plurality of first small lenses 132 of the first lens array 130 and the plurality of second small lenses 142 of the second lens array 140 include the effective incident portion 153. Is formed of an eccentric lens (an eccentric lens in which the lens optical axis is shifted from the geometric center position of the lens) that forms a condensed image near the position of the polarization separation layer 152.

  In the illumination device 100 according to the first embodiment, as shown in FIGS. 1B and 1C, the plurality of first small lenses 132 are arranged in the horizontal direction (x-axis) among the vertical and horizontal directions of the first lens array 130. The plurality of second small lenses 142 are eccentric along the horizontal direction (x-axis direction) in the vertical and horizontal directions of the second lens array 140.

In the illumination device 100 according to the first embodiment, the partial light flux from the first lens array 130 is parallel to the lateral direction (x-axis direction) of the first lens array 130 and parallel to the illumination optical axis 100ax (z-axis direction). However, since the second lens array 140 needs to make this light parallel to the illumination optical axis 100ax, the lateral direction of the second lens array 140 (in the xz plane) A plurality of second small lenses 142 are decentered along the x-axis direction.
Further, in the illumination device 100 according to the first embodiment, in order to reduce the step at the boundary between the first small lenses 132, a plurality of first lenses are arranged along the longitudinal direction (y-axis direction) of the first lens array 130. The 1 small lens 132 is not decentered. Further, in order to reduce a step at the boundary between the second small lenses 142, the plurality of second small lenses 142 are not decentered along the longitudinal direction (y-axis direction) of the second lens array 140. As described above, the decentering direction of the first small lens 132 and the second small lens 142 (the shift direction between the lens optical axis and the geometric center position of the lens) is a direction facing each other along an axis in a certain direction. ing.
As a result, in the illumination device 100 according to the first embodiment, as shown in FIGS. 1B and 1C, the lateral dimension A ₂ of the second lens array 140 is the lateral direction of the first lens array 140. It is larger than the dimension A ₁ , and the longitudinal dimension B ₂ of the second lens array 140 is substantially the same as the longitudinal dimension B ₁ of the first lens array 130.

  The first small lenses 132 of the first lens array 130 are eccentrically aligned in the same direction (x-axis direction) for each column. That is, the positions of the optical axes of the first small lenses 132 constituting the same row are the same in the x-axis direction, and the geometric center position of the lens is also the same in the x-axis direction. . On the other hand, the first small lens 132 is not decentered in the y-axis direction. As described above, the first lens array 130 is aligned and decentered only for each column as described above, and the surface shape of the first small lens is different for each column. The thickness of the first small lens 132 is adjusted for each of these columns.

  Similarly to the first lens array 130, the second small lens 142 of the second lens array 140 is eccentrically aligned only in the same direction (x-axis direction) for each column. In order to reduce the thickness, the thickness of the second small lens 142 is adjusted for each of these columns.

  In the illumination device 100 according to the first embodiment, the external shape when the first small lenses 132 are viewed along the illumination optical axis 100ax (z-axis direction) is the covered shape of the liquid crystal devices 400R, 400G, and 400B. It is set so as to be almost similar to the shape of the illumination area. For example, since the aspect ratio (ratio between the vertical and horizontal dimensions) of the image forming areas of the liquid crystal devices 400R, 400G, and 400B is 3: 4, the aspect ratio of each first small lens 132 is also set to 3: 4. ing.

  For this reason, according to the illuminating device 100 which concerns on Embodiment 1, it becomes possible to reduce a level | step difference in the whole surface of the 1st lens array 130 and the 2nd lens array 140. FIG. Of course, it is possible to eliminate steps on the entire surface of the first lens array 130 and the second lens array 140.

  In the illumination device 100 according to the first embodiment, the light source device 110 is a light source device that emits an illumination light beam substantially parallel to the illumination optical axis 100ax toward the illuminated region.

  For this reason, according to the illuminating device 100 which concerns on Embodiment 1, the illumination light beam parallel to the illumination optical axis 100ax emitted from the light source device 110 is decentered only in the horizontal direction (x-axis direction) for each column. The one lens array 130 moves toward the second lens array 140 in a plane (in the xz plane) parallel to the lateral direction (x-axis direction) of the first lens array 130 and parallel to the illumination optical axis 100ax (z-axis direction). In the plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of the first lens array 130 and parallel to the illumination optical axis 100ax (z-axis direction), the partial light beam is directed to the illumination optical axis 100ax as it is. On the other hand, it becomes a partial light beam directed in parallel to the second lens array 140.

  The partial light flux that has entered from the first lens array 130 and has passed through the translucent member 120 is transferred to the first lens array 130 by the second lens array 140 that is decentered only in the lateral direction (x-axis direction) for each column. In a plane parallel to the illumination optical axis 100ax (within the xz plane) parallel to the lateral direction (x-axis direction) and parallel to the illumination optical axis 100ax (z-axis direction), it is emitted again from the second lens array 140 as a partial light beam parallel to the illumination optical axis 100ax In a plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of the first lens array 130 and parallel to the illumination optical axis 100ax (z-axis direction), the second lens is directly converted into a partial light beam parallel to the illumination optical axis 100ax. Ejected from array 140.

  As a result, according to the illumination device 100 according to the first embodiment, as shown in FIG. 3A, the image of the first small lens 132 is excellent along the horizontal direction (x-axis direction) of the first lens array 130. Even if the condensing image of the partial light beam has a certain size, it is partially in the region of the effective incident portion 153 (see FIG. 2A) of the polarization conversion element 150. It is possible to improve the light utilization efficiency in the illumination device 100 by reliably entering the light beam and forming a condensed image near the position of the polarization separation layer 152.

  As described above, in the lighting device 100 according to the first embodiment, as illustrated in FIGS. 1A to 1C, the first lens array 130 and the second lens array 140 are integrated with one translucent member 120. Formed.

  For this reason, according to the illuminating device 100 which concerns on Embodiment 1, the 1st lens array 130 and the 2nd lens array 140 are integrally formed in one translucent member 120, and the 1st lens like the past is formed. Since the two interfaces between the air and the optical member when the array and the second lens array are configured as separate bodies (the light exit surface of the first lens array and the light entrance surface of the second lens array) can be eliminated, Unnecessary reflection can be reduced, and light utilization efficiency can be improved. Further, since the first lens array 130 and the second lens array 140 are integrally formed, there is no need to adjust the relative position between the first lens array and the second lens array as in the prior art, and after assembly. No shift occurs. For this reason, alignment with the other optical component of the illuminating device 100 becomes easy. Furthermore, since the number of optical members can be reduced (from two (first lens array and second lens array) to one (translucent member)), further cost reduction can be achieved.

  In the illumination device 100 according to the first embodiment, the first lens array 130 is a first lens in which the thickness of each first small lens 132 is adjusted so as to reduce a step at a boundary portion between each first small lens 132. The second lens array 140 is a second lens array in which the thickness of each second small lens 142 is adjusted so as to reduce a step at a boundary portion between each second small lens 142.

  When the first lens array and the second lens array are integrally formed as a translucent member as in the illumination device 100 according to the first embodiment, the thickness is larger than that of a normal lens or the like. When the step between the first small lenses and the boundary between the second small lenses in the second lens array are large, the mold release becomes worse. As a result, surface sagging and chipping easily occur, and there is a problem that it is impossible to manufacture a lens array having a desired shape as the first lens array and the second lens array.

  On the other hand, according to the illumination device 100 according to the first embodiment, the thickness of each first small lens 132 is adjusted in the first lens array 130 so as to reduce the step at the boundary between the first small lenses 132. The second lens array 140 is a second lens array in which the thickness of each second small lens 142 is adjusted so as to reduce the step at the boundary between the second small lenses 142. Therefore, the problem that a lens array having a desirable shape as the first lens array and the second lens array cannot be manufactured is also solved.

  Furthermore, in the illumination device 100 according to the first embodiment, the plurality of first small lenses 132 are eccentric along the lateral direction (x-axis direction), and the plurality of second small lenses 142 are laterally (x-axis direction). ) Is eccentric along.

  If the plurality of first small lenses or the plurality of second small lenses are not decentered, of course, it is easy to reduce the step on the entire surface of the first lens array and the second lens array. When the lens or the plurality of second small lenses are decentered both along the vertical direction and along the horizontal direction, it is not easy to reduce the step on the entire surface of the first lens array and the second lens array. Therefore, it is not easy to manufacture a lens array having a desirable shape as the first lens array and the second lens array.

  On the other hand, according to the lighting device 100 according to the first embodiment, as described above, both the plurality of first small lenses 132 and the plurality of second small lenses 142 are only along the horizontal direction (x-axis direction). Since it is decentered, it is possible to reduce the step on the entire surface of the first lens array 130 and the second lens array 140, and it is possible to manufacture a lens array having a desired shape as the first lens array and the second lens array. become.

  As described above, the projector 1000 according to the first embodiment includes the above-described illumination device 100, the liquid crystal devices 400R, 400G, and 400B that modulate the illumination light flux from the illumination device 100 according to image information, and the liquid crystal devices 400R and 400G. , 400B and the projection optical system 600 that projects the illumination light flux modulated by 400B, the projector can achieve further improvement in light utilization efficiency and further cost reduction.

[Embodiment 2]
FIG. 4 is a diagram for explaining the illumination device 100A and the projector 1000A according to the second embodiment. 4A is a diagram showing an optical system of the projector 1000A, FIG. 4B is a diagram of the translucent member 120 used in the projector 1000A, as viewed from above, and FIG. 4C is a diagram of the projector 1000A. It is the figure which looked at the translucent member 120 used for 1 from the side.

The illumination device 100A according to the second embodiment basically has a configuration that is very similar to the illumination device 100 according to the first embodiment, but as illustrated in FIG. 4A, the illumination according to the first embodiment. The configuration of the light source device is different from that of the device 100.
That is, the illuminating device 100A according to the second embodiment is arranged as the light source device on the ellipsoidal reflector 114A, the arc tube 112A disposed near the first focal point of the ellipsoidal reflector 114A, and the illuminated region side of the arc tube 112A. The auxiliary mirror 116A that reflects the light emitted from the arc tube 112A toward the illuminated area toward the ellipsoidal reflector 114A, and the collimated light reflected by the ellipsoidal reflector 114A is parallel light that is substantially parallel to the illumination optical axis 100Aax. A light source device 110A having a concave lens 118A is used.

The arc tube 112A has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion.
The ellipsoidal reflector 114A emits the light emitted from the light emission center of the light emitting portion in the arc tube 112A disposed in the vicinity of the first focal position as the focused light that converges to the second focal position. The ellipsoidal reflector 114A is inserted and fixed in one sealing portion.

As shown in FIG. 4A, the auxiliary mirror 116A is a reflecting member that covers substantially half of the bulb portion of the arc tube 112A and is disposed to face the reflective concave surface of the ellipsoidal reflector 114A. The other sealing portion is inserted and fixed.
By using such an auxiliary mirror 116A, light emitted from the light emitting portion of the arc tube 112A toward the opposite side (illuminated area side) of the ellipsoidal reflector 114A is emitted from the arc tube 112A by the auxiliary mirror 116A. Reflected toward the part. The light reflected by the auxiliary mirror 116A is emitted again from the light emitting portion of the arc tube 112A toward the ellipsoidal reflector 114A, is further reflected by the reflecting concave surface of the ellipsoidal reflector 114A, and is focused on the second focal position. Therefore, by using the auxiliary mirror 116A, the light emitted from the light emitting portion of the arc tube 112A toward the opposite side (illuminated area side) of the ellipsoidal reflector 114A is also directed from the arc tube 112A toward the ellipsoidal reflector 114A. Similarly to the light directly emitted, the light can be focused on the second focal position of the ellipsoidal reflector 114A.

  The light from the ellipsoidal reflector 114 </ b> A is converted into parallel light substantially parallel to the illumination optical axis 100 </ b> Aax by the concave lens 118 </ b> A and emitted to the first lens array 130 of the translucent member 120.

  As described above, the illumination device 100A according to the second embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the light source device, but as illustrated in FIGS. Since the first lens array 130 and the second lens array 140 are formed integrally with one translucent member 120, two air / optical members between the air and optical members are formed as in the case of the illumination device 100 according to the first embodiment. The interface can be eliminated. For this reason, unnecessary reflection can be reduced, and the light utilization efficiency can be improved. Moreover, since the number of optical members can be reduced, further cost reduction can be achieved.

  Further, according to the illumination device 100A according to the second embodiment, in the first lens array 130, the thickness of each first small lens 132 is adjusted so as to reduce the step at the boundary portion between each first small lens 132. The second lens array 140 is a first lens array, and the second lens array 140 is a second lens array in which the thickness of each second small lens 142 is adjusted so as to reduce a step at a boundary portion between each second small lens 142. As in the case of the illumination device 100 according to the first embodiment, the problem that a lens array having a desired shape as the first lens array and the second lens array cannot be manufactured is also solved.

  Furthermore, according to the illuminating device 100A according to the second embodiment, since the plurality of first small lenses 132 and the plurality of second small lenses 142 are both decentered only along the lateral direction (x-axis direction). As in the case of the illumination device 100 according to the first embodiment, it is possible to reduce a step on the entire surface of the first lens array 130 and the second lens array 140, and lenses having desirable shapes as the first lens array and the second lens array. An array can be manufactured.

  Therefore, the illumination device 100A according to the second embodiment is an illumination device capable of further improving the light use efficiency and further reducing the cost in the projector, as in the case of the illumination device 100 according to the first embodiment.

  The projector 1000A according to the second embodiment is modulated by the illumination device 100A, the liquid crystal devices 400R, 400G, and 400B that modulate the illumination light flux from the illumination device 100A according to image information, and the liquid crystal devices 400R, 400G, and 400B. Since the projector includes the projection optical system 600 that projects the illumination light flux, the projector can further improve the light utilization efficiency and further reduce the cost.

[Embodiment 3]
FIG. 5 is a diagram for explaining the illumination device 100B and the projector 1000B according to the third embodiment. FIG. 5A is a diagram illustrating an optical system of the projector 1000B, FIG. 5B is a diagram of a translucent member 120B used in the projector 1000B, and FIG. 5C is a diagram illustrating the projector 1000B. It is the figure which looked at the translucent member 120B used for 1 from the side.

As illustrated in FIGS. 5A to 5C, the illumination device 100 </ b> B according to the third embodiment is different from the illumination device 100 </ b> A according to the second embodiment in the configuration of the light source device, the polarization conversion element, and the translucent member. Is different.
That is, the illuminating device 100B according to the third embodiment uses the light source device 110B that emits an illuminating light beam that diverges toward the illuminated region as the light source device, and the polarization conversion element in the illuminating device 100A according to the second embodiment. A polarization conversion element 150B having a different effective incident part range from the polarization conversion element 150A is used, and a plurality of first small lenses are arranged as a translucent member along the longitudinal direction (y-axis direction) of the first lens array 130B. The translucent member 120B in which the second small lens 142B is eccentric along the lateral direction (x-axis direction) of the second lens array 140B is used.

The illumination device 100B according to the third embodiment differs from the illumination device 100A according to the second embodiment only in the action of the lens provided on the illuminated region side of the ellipsoidal reflector.
That is, in the illumination device 100A according to the second embodiment, as shown in FIG. 4A, the concave lens 118A is provided on the illuminated area side of the ellipsoidal reflector 114A, and the converging light emitted from the ellipsoidal reflector 114A is provided. The light is configured to be emitted from the light source device 110A as parallel light substantially parallel to the illumination optical axis 100Aax by the concave lens 118A.
On the other hand, in the illumination device 100B according to the third embodiment, as shown in FIG. 5A, a concave lens 118B is provided on the illuminated region side of the ellipsoidal reflector 114A and emitted from the ellipsoidal reflector 114A. The focused light is configured to be emitted from the light source device 110 </ b> B as divergent light that diverges outward from the illumination optical axis 100 </ b> Bax as a central axis by the concave lens 118 </ b> B.

In the illumination device 100B according to the third embodiment, as shown in FIG. 5B, the partial light flux from the first lens array 130B is parallel to the lateral direction (x-axis direction) of the first lens array 130B and is the illumination optical axis. In the plane parallel to 100 Bax (z-axis direction) (in the xz plane), the light travels outward. However, the second lens array 140B needs to convert this light into light parallel to the illumination optical axis 100Bax. A plurality of second small lenses 142B are decentered along the lateral direction (x-axis direction) of the two-lens array 140B.
Further, in the illumination device 100B according to the third embodiment, in order to reduce the step at the boundary between the second small lenses 142B, as shown in FIG. 5C, the longitudinal direction (y A plurality of second small lenses 142B are not decentered along the axial direction. Accordingly, the illumination light beam that diverges from the light source device 110B to the illuminated region side needs to be parallel light that is substantially parallel to the illumination optical axis 100Bax, and therefore the vertical direction (y-axis direction) of the first lens array 130B. ) Are decentered along the first small lens 132B. As described above, the decentering direction of the first small lens 132B and the second small lens 142B (the shift direction between the lens optical axis and the geometric center position of the lens) is along the axes orthogonal to each other.
As a result, in the illuminating device 100B according to Embodiment 3, the lateral dimension A ₂ of the second lens array 140B is larger than the lateral dimension A ₁ of the first lens array 130B, and the longitudinal dimension of the second lens array 140B. B ₂ is substantially the same as the longitudinal dimension B ₁ of the first lens array 130B.

  The first small lenses 132B of the first lens array 130B are eccentrically aligned in the same direction (y-axis direction) for each row. That is, the positions of the lens optical axes of the first small lenses 132B constituting the same row are the same in the y-axis direction, and the geometric center positions of the lenses are also the same in the y-axis direction. . On the other hand, the first small lens 132B is not decentered in the x-axis direction. As described above, the first lens array 130B is eccentrically aligned only for each row as described above, and the surface shape of the first small lens is different for each row, so that the step at the boundary portion of the row is reduced. As described above, the thickness of the first small lens 132B is adjusted for each of these rows.

  The second small lenses 142B of the second lens array 140B are eccentrically aligned in the same direction (x-axis direction) for each column. That is, the positions of the lens optical axes of the second small lenses 142B constituting the same row are the same in the x-axis direction, and the geometric center positions of the lenses are also the same in the x-axis direction. . On the other hand, the second small lens 142B is not decentered in the y-axis direction. As described above, the second lens array 140B is eccentrically aligned only for each column as described above, and the surface shape of the second small lens is different for each column. The thickness of the second small lens 142B is adjusted for each of these columns.

  For this reason, according to the illuminating device 100B which concerns on Embodiment 3, it becomes possible to reduce a level | step difference in the whole surface of the 1st lens array 130B and the 2nd lens array 140B. Of course, it is possible to eliminate the step on the entire surface of the first lens array 130B and the second lens array 140B.

  According to the illuminating device 100B according to the third embodiment, as shown in FIGS. 5B and 5C, the illuminating optical axis 100Bax emitted from the light source device 110B diverges outward as the central axis. The illumination light beam is parallel to the lateral direction (x-axis direction) of the first lens array 130B and illuminating optical axis 100Bax (z-axis direction) by the first lens array 130B decentered only in the vertical direction (y-axis direction) for each row. ) In the plane parallel to (xz plane) as it is, it becomes a partial light beam directed outward toward the second lens array 140B as it is, parallel to the longitudinal direction (y-axis direction) of the first lens array 130B and the illumination optical axis 100Bax ( In a plane parallel to the (z-axis direction) (in the yz plane), a partial light beam is directed to the second lens array 140B in parallel to the illumination optical axis 100Bax.

  The partial light flux that has entered from the first lens array 130B and passed through the translucent member 120B is reflected by the second lens array 140B that is decentered only in the lateral direction (x-axis direction) for each column. A partial light beam parallel to the illumination optical axis 100Bax is emitted from the second lens array 140B in a plane parallel to the lateral direction (x-axis direction) and parallel to the illumination optical axis 100Bax (z-axis direction) (in the xz plane). In a plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of one lens array 130B and parallel to the illumination optical axis 100Bax direction (z-axis direction), the second lens is used as a partial light beam that is parallel to the illumination optical axis 100Bax. Ejected from array 140B.

  As described above, the illumination device 100B according to the third embodiment differs from the illumination device 100A according to the second embodiment in the configurations of the light source device, the polarization conversion element, and the translucent member, but the first lens array 130B and the second lens array 130B. Since the lens array 140B is formed integrally with one translucent member 120B, the two interfaces between the air and the optical member may be eliminated as in the case of the illumination device 100A according to the second embodiment. it can. For this reason, unnecessary reflection can be reduced, and the light utilization efficiency can be improved. Moreover, since the number of optical members can be reduced, further cost reduction can be achieved.

  Further, according to the illumination device 100B according to the third embodiment, in the first lens array 130B, the thickness of each first small lens 132B is adjusted so as to reduce the step at the boundary portion between each first small lens 132B. The second lens array 140B is a first lens array, and the second lens array 140B is a second lens array in which the thickness of each second small lens 142B is adjusted so as to reduce a step at a boundary portion between each second small lens 142B. As in the case of the illumination device 100A according to the second embodiment, the problem that a lens array having a desired shape as the first lens array and the second lens array cannot be manufactured is also solved.

  Furthermore, according to the illumination device 100B according to the third embodiment, the plurality of first small lenses 132B are decentered only along the vertical direction (y-axis direction), and the plurality of second small lenses 142B are laterally (x-axis direction). ), The step difference can be reduced on the entire surface of the first lens array 130B and the second lens array 140B as in the case of the illumination device 100A according to the second embodiment. It becomes possible to manufacture a lens array having a desired shape as the lens array and the second lens array.

  Therefore, the illuminating device 100B according to the third embodiment is an illuminating device capable of further improving the light use efficiency and further reducing the cost in the projector, similarly to the illuminating device 100A according to the second embodiment.

  In the illumination device 100B according to the third embodiment, as described above, the illumination light beam that diverges outward from the illumination optical axis 100Bax is emitted from the light source device 110B, and the first lens array 130B is in the vertical direction ( Since the second lens array 140B is eccentric only in the horizontal direction (x-axis direction), the illumination light beam emitted from the illumination device 100B is laterally (x-axis direction) and vertical. It is possible to emit a partial light beam that extends in both directions (y-axis direction) and is parallel to the illumination optical axis 100Bax.

  For this reason, according to the illuminating device 100B which concerns on Embodiment 3, the image of the 1st small lens 132B is further improved along the horizontal direction (x-axis direction) and the vertical direction (y-axis direction) of the 1st lens array 130B. And parallel light parallel to the illumination optical axis 100Bax can be emitted. As a result, even if the condensing image of the partial light beam has a certain size, the partial light beam surely enters the region of the effective incident portion of the polarization conversion element 150B and is condensed near the position of the polarization separation layer. It is possible to improve the light utilization efficiency in the lighting device 100B by forming an image.

  The projector 1000B according to the third embodiment is modulated by the illumination device 100B, the liquid crystal devices 400R, 400G, and 400B that modulate the illumination light beam from the illumination device 100B according to image information, and the liquid crystal devices 400R, 400G, and 400B. Since the projector includes the projection optical system 600 that projects the illumination light flux, the projector can further improve the light utilization efficiency and further reduce the cost.

[Embodiment 4]
FIG. 6 is a view for explaining an illumination device 100C and a projector 1000C according to the fourth embodiment. 6A is a diagram illustrating an optical system of the projector 1000C, FIG. 6B is a diagram of a translucent member 120C used in the projector 1000C, and FIG. 6C is a diagram illustrating the projector 1000C. It is the figure which looked at the translucent member 120C used for 1 from the side.

  FIG. 7 is a view for explaining the effect of the illumination device 100 </ b> C according to the fourth embodiment. FIG. 7A is a diagram illustrating an image of the first small lens 132C on the light incident surface of the polarization conversion element 150C according to the fourth embodiment, and FIG. 7B is a light incidence of the polarization conversion element 150c in the comparative example. It is a figure which shows the image of the 1st small lens on a surface.

As shown in FIGS. 6A to 6C, the illumination device 100C according to the fourth embodiment is different from the illumination device 100A according to the second embodiment in the configuration of the polarization conversion element and the translucent member. Yes.
That is, the illumination device 100C according to the fourth embodiment uses the polarization conversion element 150C having a different effective incident range from the polarization conversion element 150A in the illumination device 100A according to the second embodiment as the polarization conversion element. A plurality of first small lenses 132C are eccentric along the longitudinal direction (y-axis direction) of the first lens array 130C, and a plurality of structural members are arranged along the longitudinal direction (y-axis direction) of the second lens array 140C. The translucent member 120C in which the second small lens 142C is eccentric is used.

In the illumination device 100C according to the fourth embodiment, as shown in FIG. 6C, the partial light flux from the first lens array 130C is parallel to the longitudinal direction (y-axis direction) of the first lens array 130C and the illumination optical axis. The light is directed outward in a plane parallel to 100Cax (in the z-axis direction) (in the yz plane), but the second lens array 140C needs to make this light parallel to the illumination optical axis 100Cax. A plurality of second small lenses 142C are decentered along the longitudinal direction (y-axis direction) of the two-lens array 140C.
In the illumination device 100C according to the fourth embodiment, in order to reduce a step at the boundary portion between the first small lenses 132C, as shown in FIG. 6B, the lateral direction (x A plurality of first small lenses 132C are not decentered along the axial direction. Further, in order to reduce the step at the boundary between the second small lenses 142C, the plurality of second small lenses 142C are not decentered along the lateral direction (x-axis direction) of the second lens array 140C. Thus, the decentering direction of the first small lens 132C and the second small lens 142C (the direction of deviation between the lens optical axis and the geometric center position of the lens) is a direction facing each other along an axis in a certain direction. ing.
As a result, in the illumination device 100C according to the fourth embodiment, the vertical dimension B ₂ of the second lens array 140C is greater than the longitudinal dimension B ₁ of the first lens array 130C, the lateral dimensions of the second lens array 140C A ₂ is substantially the same as the lateral dimension A ₁ of the first lens array 130C.

  The first small lenses 132C of the first lens array 130C are eccentrically aligned in the same direction (y-axis direction) for each row. That is, the positions of the lens optical axes of the first small lenses 132C constituting the same row are the same in the y-axis direction, and the geometric center positions of the lenses are also the same in the y-axis direction. . On the other hand, the first small lens 132C is not decentered in the x-axis direction. As described above, the first lens array 130C is eccentrically aligned only for each row as described above, and the surface shape of the first small lens is different for each row, thereby reducing the step at the boundary portion of the row. Thus, the thickness of the first small lens 132C is adjusted for each of these rows.

  Similarly to the first lens array 130C, the second small lens 142C of the second lens array 140C is decentered by being aligned only in the same direction (y-axis direction) for each row, thus reducing the step at the boundary portion of the row. Thus, the thickness of the second small lens 142C is adjusted for each of these rows.

  For this reason, according to the illuminating device 100C which concerns on Embodiment 4, it becomes possible to reduce a level | step difference in the whole surface of the 1st lens array 130C and the 2nd lens array 140C. Of course, it is possible to eliminate steps on the entire surface of the first lens array 130C and the second lens array 140C.

  According to such an illuminating device 100C according to the fourth embodiment, as shown in FIGS. 6B and 6C, the illumination light flux parallel to the illumination optical axis 100Cax emitted from the light source device 110A is transmitted in each row. A plane parallel to the lateral direction (x-axis direction) of the first lens array 130C and parallel to the illumination optical axis 100Cax (z-axis direction) by the first lens array 130C decentered only in the vertical direction (y-axis direction) every time Inside (in the xz plane), it becomes a partial light beam directed to the second lens array 140C in parallel to the illumination optical axis 100Cax as it is, parallel to the vertical direction (y-axis direction) of the first lens array 130C and the illumination optical axis 100Cax (z In a plane parallel to the (axial direction) (in the yz plane), it becomes a partial light beam directed outward toward the second lens array 140C.

  The partial light flux that has entered from the first lens array 130C and passed through the translucent member 120C is lateral to the first lens array 130C by the second lens array 140C that is decentered only in the vertical direction (y-axis direction) for each row. In the plane parallel to the direction (x-axis direction) and parallel to the illumination optical axis 100Cax (z-axis direction) (in the xz plane), it is emitted from the second lens array 140C as a partial light beam parallel to the illumination optical axis 100Cax. In a plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of one lens array 130C and parallel to the illumination optical axis 100Cax (z-axis direction), the second lens array is again formed as a partial light beam parallel to the illumination optical axis 100Cax. Injected from 140C.

  As described above, the illumination device 100C according to the fourth embodiment differs from the illumination device 100A according to the second embodiment in the configuration of the polarization conversion element and the translucent member, but the first lens array 130C and the second lens array 140C. Is formed integrally with one translucent member 120C, and therefore, the two interfaces between the air and optical members can be eliminated as in the case of the illumination device 100A according to the second embodiment. For this reason, unnecessary reflection can be reduced, and the light utilization efficiency can be improved. Moreover, since the number of optical members can be reduced, further cost reduction can be achieved.

  Further, according to the illumination device 100C according to the fourth embodiment, in the first lens array 130C, the thickness of each first small lens 132C is adjusted so as to reduce the step at the boundary portion between each first small lens 132C. The second lens array 140C is a first lens array, and the second lens array 140C is a second lens array in which the thickness of each second small lens 142C is adjusted so as to reduce a step at a boundary portion between each second small lens 142C. As in the case of the illumination device 100A according to the second embodiment, the problem that a lens array having a desired shape as the first lens array and the second lens array cannot be manufactured is also solved.

  Furthermore, according to the illuminating device 100C according to the fourth embodiment, the plurality of first small lenses 132C and the plurality of second small lenses 142C are both decentered only along the vertical direction (y-axis direction). As in the case of the illumination device 100A according to the second embodiment, it is possible to reduce a step on the entire surface of the first lens array 130C and the second lens array 140C, and lenses having desirable shapes as the first lens array and the second lens array. An array can be manufactured.

  Therefore, the illuminating device 100C according to the fourth embodiment is an illuminating device capable of further improving the light use efficiency and further reducing the cost in the projector, as in the case of the illuminating device 100A according to the second embodiment.

In the illumination device 100C according to the fourth embodiment, the plurality of first small lenses 132C are decentered along the longitudinal direction (y-axis direction) of the first lens array 130C. Each partial light beam is outward toward the second lens array 140C in a plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of the first lens array 130C and parallel to the illumination optical axis 100Cax (z-axis direction). It becomes the light toward
For this reason, according to the illuminating device 100C which concerns on Embodiment 4, as shown to Fig.7 (a), the image of the 1st small lens 132C is favorable along the vertical direction (y-axis direction) of the 1st lens array 130C. Can be separated. As a result, even if the condensing image of the partial light beam has a certain size, the partial light beam surely enters the area of the effective incident portion of the polarization conversion element 150C and is condensed near the position of the polarization separation layer. An image can be formed to improve the light use efficiency in the lighting apparatus 100C. In addition, the illumination device 100C according to the fourth embodiment is suitable as an illumination device that illuminates the in-plane illuminance distribution in the illuminated region uniformly and with high brightness in the electro-optic modulator such as the liquid crystal devices 400R, 400G, and 400B. It will be a thing.

  The projector 1000C according to the fourth embodiment is modulated by the above-described illumination device 100C, the liquid crystal devices 400R, 400G, and 400B that modulate the illumination light flux from the illumination device 100C according to image information, and the liquid crystal devices 400R, 400G, and 400B. Since the projector includes the projection optical system 600 that projects the illumination light flux, the projector can further improve the light utilization efficiency and further reduce the cost.

[Embodiment 5]
FIG. 8 is a view for explaining an illumination device 100D and a projector 1000D according to the fifth embodiment. FIG. 8A is a view showing an optical system of the projector 1000D, FIG. 8B is a view of the translucent member 120D used in the projector 1000D, and FIG. 8C is a view of the projector 1000D. It is the figure which looked at translucent member 120D used for a side from the side.

As shown in FIGS. 8A to 8C, the illumination device 100D according to the fifth embodiment is different from the illumination device 100B according to the third embodiment in the configuration of the polarization conversion element and the translucent member. Yes.
In other words, the illumination device 100D according to the fifth embodiment uses the polarization conversion element 150D having a different effective incident part range from the polarization conversion element 150B in the illumination device 100B according to the third embodiment as the polarization conversion element. A plurality of first small lenses 132D are decentered along the lateral direction (x-axis direction) of the first lens array 130D, and the plurality of first small lenses 132D are arranged along the longitudinal direction (y-axis direction) of the second lens array 140D. The translucent member 120D in which the second small lens 142D is eccentric is used. As the light source device, a light source device 110B that emits an illumination light beam that diverges toward the illuminated area is used, as in the case of the illumination device 100B according to the third embodiment.

In the illumination device 100D according to the fifth embodiment, as illustrated in FIG. 8C, the partial light flux from the first lens array 130D is parallel to the longitudinal direction (y-axis direction) of the first lens array 130D and the illumination optical axis. The light is directed outward in a plane parallel to 100 Dax (z-axis direction) (in the yz plane), but the second lens array 140D needs to make this light parallel to the illumination optical axis 100Dax. A plurality of second small lenses 142D are decentered along the longitudinal direction (y-axis direction) of the two-lens array 140D.
In the illumination device 100D according to the fifth embodiment, as shown in FIG. 8B, in order to reduce a step at the boundary between the second small lenses 142D, the lateral direction (x A plurality of second small lenses 142D are not decentered along the axial direction. Accordingly, the illumination light beam diverging from the light source device 110B to the illuminated region side needs to be parallel light substantially parallel to the illumination optical axis 100Dax, so that the lateral direction (x-axis direction) of the first lens array 130D is required. ) Are decentered along the plurality of first small lenses 132D. As described above, the decentering direction of the first small lens 132D and the second small lens 142D (the shift direction between the lens optical axis and the geometric center position of the lens) is along axes orthogonal to each other.
Therefore, in the lighting apparatus 100D according to the fifth embodiment, the longitudinal dimension B ₂ of the second lens array 140D is larger than the longitudinal dimension B ₁ of the first lens array 130D, the lateral dimensions of the second lens array 140D A ₂ is substantially the same as the lateral dimension A ₁ of the first lens array 130D.

  The first small lenses 132D of the first lens array 130D are eccentrically aligned in the same direction (x-axis direction) for each column. That is, the positions of the lens optical axes of the first small lenses 132D constituting the same row are the same in the x-axis direction, and the geometric center positions of the lenses are also the same in the x-axis direction. . On the other hand, the first small lens 132D is not decentered in the y-axis direction. As described above, the first lens array 130D is aligned and decentered only for each column as described above, and the surface shape of the first small lens is different for each column. The thickness of the first small lens 132D is adjusted for each of these columns.

  The second small lenses 142D of the second lens array 140D are eccentrically aligned in the same direction (y-axis direction) for each row. That is, the positions of the lens optical axes of the second small lenses 142D constituting the same row are the same in the y-axis direction, and the geometric center positions of the lenses are also the same in the y-axis direction. . On the other hand, the second small lens 142D is not decentered in the x-axis direction. As described above, the second lens array 140D is aligned and decentered only for each row as described above, and the surface shape of the second small lens is different for each row, so that the step at the boundary portion of the row is reduced. Thus, the thickness of the second small lens 142D is adjusted for each of these rows.

  For this reason, according to the illuminating device 100D which concerns on Embodiment 5, it becomes possible to reduce a level | step difference in the whole surface of 1st lens array 130D and 2nd lens array 140D. Of course, it is possible to eliminate the step on the entire surface of the first lens array 130D and the second lens array 140D.

  According to such an illuminating device 100D according to the fifth embodiment, as shown in FIGS. 8B and 8C, the illuminating optical axis 100Dax emitted from the light source device 110B diverges to the outside as a central axis. The illumination light beam is parallel to the lateral direction (x-axis direction) of the first lens array 130D and illuminated by the illumination optical axis 100Dax (z-axis) by the first lens array 130D that is decentered only in the lateral direction (x-axis direction) for each column. In the plane parallel to the direction (in the xz plane), it becomes a partial light beam directed to the second lens array 140D parallel to the illumination optical axis 100Dax, and is parallel to the longitudinal direction (y-axis direction) of the first lens array 130D and illuminated. In a plane parallel to the optical axis 100Dax direction (z-axis direction) (in the yz plane), it becomes a partial light beam that goes outward toward the second lens array 140D as it is.

  The partial light flux that has entered from the first lens array 130D and passed through the translucent member 120D is lateral to the first lens array 130D by the second lens array 140D that is decentered only in the vertical direction (y-axis direction) for each row. In a plane parallel to the direction (x-axis direction) and parallel to the illumination optical axis 100Dax (z-axis direction) (in the xz plane), it is emitted from the second lens array 140D as a partial light beam parallel to the illumination optical axis 100Dax. In a plane (in the yz plane) parallel to the longitudinal direction (y-axis direction) of one lens array 130D and parallel to the illumination optical axis 100Dax (z-axis direction), the second lens array 140D is a partial light beam parallel to the illumination optical axis 100Dax. Is injected from.

  As described above, the illumination device 100D according to the fifth embodiment differs from the illumination device 100B according to the third embodiment in the configuration of the polarization conversion element and the translucent member, but the first lens array 130D and the second lens array 140D. Is formed integrally with one translucent member 120D, and therefore, the two interfaces between the air and the optical member can be eliminated as in the case of the illumination device 100B according to the third embodiment. For this reason, unnecessary reflection can be reduced, and the light utilization efficiency can be improved. Moreover, since the number of optical members can be reduced, further cost reduction can be achieved.

  Further, according to the illumination device 100D according to the fifth embodiment, the thickness of each first small lens 132D is adjusted in the first lens array 130D so as to reduce the step at the boundary between the first small lenses 132D. Since the second lens array 140D is a first lens array and the second lens array 140D is a second lens array in which the thickness of each second small lens 142D is adjusted so as to reduce the step at the boundary between the second small lenses 142D. As in the case of the illumination device 100B according to the third embodiment, the problem that a lens array having a desirable shape as the first lens array and the second lens array cannot be manufactured is also solved.

  Furthermore, according to the illumination device 100D according to the fifth embodiment, the plurality of first small lenses 132D are decentered only along the horizontal direction (x-axis direction), and the plurality of second small lenses 142D are arranged in the vertical direction (y-axis direction). ), The step difference can be reduced on the entire surface of the first lens array 130D and the second lens array 140D as in the case of the illumination device 100B according to the third embodiment. It becomes possible to manufacture a lens array having a desired shape as the lens array and the second lens array.

  Therefore, the illuminating device 100D according to the fifth embodiment is an illuminating device that can further improve the light use efficiency and further reduce the cost in the projector, similarly to the illuminating device 100B according to the third embodiment.

  In the illumination device 100D according to the fifth embodiment, as described above, the illumination light beam diverging outward is emitted from the light source device 110B with the illumination optical axis 100Dax as the central axis, and the first lens array 130D is in the lateral direction ( Since the second lens array 140D is decentered only in the vertical direction (y-axis direction), the illumination light beam emitted from the illumination device 100D is laterally (x-axis direction) and vertical. It is possible to emit a partial light beam that extends in both directions (y-axis direction) and is parallel to the illumination optical axis 100Dax.

  Therefore, according to the illumination device 100D according to the fifth embodiment, the image of the first small lens 132D is further improved along the horizontal direction (x-axis direction) and the vertical direction (y-axis direction) of the first lens array 130D. And parallel light parallel to the illumination optical axis 100Dax can be emitted. As a result, even if the condensed image of the partial light beam has a certain size, the partial light beam surely enters the region of the effective incident portion of the polarization conversion element 150D and is condensed near the position of the polarization separation layer. It is possible to improve the light use efficiency in the lighting device 100D by forming an image. The illumination device 100D according to the fifth embodiment is suitable as an illumination device that uniformly illuminates the in-plane illuminance distribution of the illuminated area in the electro-optic modulation device such as the liquid crystal devices 400R, 400G, and 400B with high luminance. It will be a thing.

  The projector 1000D according to the fifth embodiment is modulated by the illumination device 100D, the liquid crystal devices 400R, 400G, and 400B that modulate the illumination light flux from the illumination device 100D according to image information, and the liquid crystal devices 400R, 400G, and 400B. Since the projector includes the projection optical system 600 that projects the illumination light flux, the projector can further improve the light utilization efficiency and further reduce the cost.

  The projector of the present invention has been described based on each of the above embodiments. However, the present invention is not limited to each of the above embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

(1) In the projectors 1000 to 1000D of the above-described embodiments, the first small lenses 132, 132B, 132C, and 132D have a plane shape of “vertical dimension: horizontal dimension = 3: 4 rectangle”. The present invention is not limited to this. For example, when it is desired to set the aspect ratio of the illuminated area to 9:16, a “vertical dimension: horizontal dimension = 9: 16 rectangle” is preferably used. be able to.

(2) Although the projectors 1000 to 1000D in the above embodiments are transmissive projectors, the present invention is not limited to this. The present invention can also be applied to a reflection type projector. Here, “transmission type” means that an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means, such as a reflective liquid crystal device, is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(3) The projectors 1000 to 1000D of the above embodiments use a liquid crystal device as an electro-optic modulation device, but the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(4) In the above embodiments, the projector using the three liquid crystal devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this, and one, two, or four projectors are used. The present invention can also be applied to a projector using the above liquid crystal device.

(5) The present invention is applied to a rear projection projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection projector that projects from the side that observes the projected image. Is also possible.

FIG. 3 is a view for explaining the illumination device 100 and the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the polarization conversion element 150. FIG. The figure shown in order to demonstrate the effect of the illuminating device 100 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the illuminating device 100A and projector 1000A which concern on Embodiment 2. FIG. The figure shown in order to demonstrate the illuminating device 100B and projector 1000B which concern on Embodiment 3. FIG. The figure shown in order to demonstrate the illuminating device 100C and projector 1000C which concern on Embodiment 4. FIG. The figure shown in order to demonstrate the effect of 100 C of illuminating devices which concern on Embodiment 4. FIG. The figure shown in order to demonstrate the illuminating device 100D and projector 1000D which concern on Embodiment 5. FIG. The figure shown in order to demonstrate the conventional projector 1000a. The figure shown in order to demonstrate the display shadow in the conventional projector 1000a. The figure which shows the principal part of the other illuminating device 100b.

Explanation of symbols

100, 100A, 100B, 100C, 100D, 100a ... Illumination device, 100ax, 100Aax, 100Bax, 100Cax, 100Dax, 100aax, 100bax ... Illumination optical axis, 110, 110A, 110B, 110a ... Light source device, 112, 112A ... Arc tube 114, 114a ... Parabolic reflector, 114A ... Ellipsoidal reflector, 116A ... Auxiliary mirror, 118A, 118B ... Concave lens, 120, 120B, 120C, 120D ... Translucent member, 130, 130B, 130C, 130D, 130a, 130b ... 1st lens array, 132, 132B, 132C, 132D ... 1st small lens, 140, 140B, 140C, 140D, 140a, 140b ... 2nd lens array, 142, 142B, 142C, 142D ... 2nd small lens , 150, 150A, 150B, 150C, 150D, 150a, 150b, 150c ... polarization conversion element, 152, 152a, 152b ... polarization separation layer, 153, 153a, 153b ... effective incidence part, 154, 154a, 154b ... reflection layer, 156, 156a, 156b ... retardation plate, 157 ... light shielding plate, 158 ... opening, 159 ... light shielding part, 160, 160a ... superimposing lens, 170, 230, 240, 250 ... reflection mirror, 200 ... color separation light guide optics System 210, 220 ... Dichroic mirror, 260 ... Incident side lens, 270 ... Relay lens, 280R, 280G, 280B ... Condensing lens, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection optical system 1000, 1000A, 1000B, 1000C, 000D, 1000a, 1000b ... projector, A ₁ ... lateral dimension of the first lens array, A ₂ ... lateral dimension of the second lens array, B ₁ ... longitudinal dimension of the first lens array, B ₂ ... second lens Array vertical dimension, SCR ... screen, S ... step.

Claims (3)

A light source device that emits an illumination light beam toward the illuminated area;
A first lens array having a plurality of first small lenses for dividing an illumination light beam emitted from the light source device into a plurality of partial light beams;
A lighting device having at least a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array;
The first lens array and the second lens array are formed integrally with one translucent member,
The plurality of first small lenses are aligned eccentrically in the horizontal direction for each row , and the optical axis and geometric center position of each of the plurality of first small lenses constituting the same row are horizontal. In the same direction,
The plurality of first small lenses are not decentered in the vertical direction, and the thickness of the first small lens is adjusted for each row so as to reduce a step at the boundary of the rows,
Wherein the plurality of second small lenses are eccentric aligned in the longitudinal direction, the optical axis and the geometrical center position of each lens of the plurality of second small lenses of the same row for each row, longitudinal In the same position,
The plurality of second small lenses are not decentered in the lateral direction, and the thickness of the second small lenses is adjusted for each row so as to reduce a step at a boundary portion of the rows. Lighting device. A light source device that emits an illumination light beam toward the illuminated area;
A first lens array having a plurality of first small lenses for dividing an illumination light beam emitted from the light source device into a plurality of partial light beams;
A lighting device having at least a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array;
The first lens array and the second lens array are formed integrally with one translucent member,
The plurality of first small lenses are aligned eccentrically in the vertical direction for each row, and the optical axis and geometric center position of each of the plurality of first small lenses constituting the same row are in the vertical direction. In the same position,
The plurality of first small lenses are not decentered in the lateral direction, and the thickness of the first small lens is adjusted for each row so as to reduce a step at a boundary portion of the rows,
The plurality of second small lenses are aligned eccentrically in the horizontal direction for each row, and the optical axis and geometric center position of each of the plurality of second small lenses constituting the same row are horizontal. In the same direction,
The plurality of second small lenses are not decentered in the vertical direction, and the thickness of the second small lenses is adjusted for each row so as to reduce a step at a boundary portion of the rows. A lighting device. A lighting device;
An electro-optic modulation device that modulates illumination light flux from the illumination device according to image information;
A projector including a projection optical system that projects an illumination light beam modulated by the electro-optic modulation device,
3. The projector according to claim 1, wherein the lighting device is the lighting device according to claim 1.