1. A lighting device comprising:
a first light source section;
a second light source section; and
a light combining section for combining light emitted from the first light source section and light emitted from the second light source section, wherein
a first region on which the light emitted from the first light source section is incident and a second region on which the light emitted from the second light source section is incident do not overlap each other, on an incident surface of the light combining section, and
the surface area of the first region and the surface area of the second region are different from each other.
2. The lighting device according to claim 1, further comprising a first rod integrator for guiding the light emitted from the first light source section, onto the light combining section, wherein:
the light combining section is a second rod integrator;
the surface area of an incident surface of the second rod integrator is larger than the surface area of an exit surface of the first rod integrator;
the light emitted from the first light source section is converged on an incident surface of the first rod integrator; and
the light emitted from the second light source section is converged on the second region.
3. The lighting device according to claim 2, wherein;
the first rod integrator is a rectangular-columnar optical element with the exit surface being inclined relative to its central axis, longitudinally;
the exit surface of the first rod integrator is in contact with the incident surface of the second rod integrator;
the first rod integrator is disposed such that the central axis is inclined relative to the incident surface of the second rod integrator, thereby forming a space to the second light source section side of the first region and the second region; and
the light emitted from the second light source section converges within the formed space.
4. The lighting device according to claim 2, wherein
a plurality of pairs of the first light source section and the first rod integrator is provided;
each first rod integrator is a rectangular-columnar optical element with the exit surface inclined relative to its central axis, longitudinally;
the exit surface of each first rod integrator is in contact with the incident surface of the second rod integrator;
the first rod integrators are disposed such that the central axes are inclined relative to the incident surface of the second rod integrator, and so as to spread apart with increasing distance from the incident surface of the second rod integrator, thereby forming a space to the second light source section side of the first region and the second region; and
the light emitted from the second light source section converges within the formed space.
5. The lighting device according to claim 2, wherein a converging angle of the light emitted from the first light source section and a converging angle of the light emitted from the second light source section are substantially equal to each other.
6. The lighting device according to claim 1, wherein
the light combining section includes a first multi-lens array integrator that the lights emitted from the first light source section and the second light source section enter, and a second multi-lens array integrator having a plurality of lenses each corresponding to each lens constituting the first multi-lens array integrator, and
the lighting device further comprises a reflecting member having a reflecting surface for reflecting at least once the light emitted from the first light source section and for guiding the light emitted from the first light source section, to the first multi-lens array integrator.
7. The lighting device according to claim 6, wherein, in the second multi-lens array integrator, the size of each lens in a portion corresponding to the first region is substantially equal to the size of each lens in a portion corresponding to the second region.
8. The lighting device according to claim 6, wherein:
the reflecting member is disposed such that the reflecting surface thereof is inclined relative to an incident surface of the first multi-lens array integrator, thereby forming a space to the second light source section side of the first region and the second region; and
the light from the second light source section passes within the formed space.
9. The lighting device according to claim 6, wherein:
a plurality of pairs of the first light source section and the reflecting member are provided;
the reflecting members are disposed such that the reflecting surfaces thereof are inclined relative to an incident surface of the first multi-lens array integrator, and so as to spread apart with increasing distance from the incident surface of the first multi-lens array integrator, thereby forming a space to the second light source section side of the first region and the second region; and
the light from the second light source section passes within the formed space.
10. The lighting device according to claim 1, wherein:
the etendue of the first light source section is different from the etendue of the second light source section; and
the surface area of the first region and the surface area of the second region are proportional to the etendue of the first light source section and the etendue of the second light source section, respectively.
11. The lighting device according to claim 1, wherein:
an image of the first light source section is similar in shape to the first region; and
an image of the second light source section is similar in shape to the second region.
12. The lighting device according to claim 1, wherein the first light source section and the second light source section respectively include light-emitting sections for emitting light having one of three primary colors and having different spectral characteristics.
13. The lighting device according to claim 1, wherein:
each of the first light source section and the second light source section includes:
a laser element; and
a fluorescent material for emitting light by being excited by a laser beam emitted from the laser element.
14. The lighting device according to claim 1, wherein at least the one of the first light source section and the second light source section having the higher etendue, includes an LED.
15. The lighting device according to claim 1, wherein:
the etendue of the first light source section is lower than the etendue of the second light source section;
the first light source section includes a laser element and a fluorescent material for emitting light by being excited by a laser beam emitted from the laser element; and
the second light source section includes an LED.
16. The lighting device according to claim 1, wherein:
the etendue of the first light source section is lower than the etendue of the second light source section;
the first light source section includes a laser element and a diffusion section for diffusing a laser beam emitted from the laser element; and
the second light source section includes an LED.
17. The lighting device according to claim 1, wherein at least one of either the first light source section or the second light source section includes:
a laser element;
a fluorescent material for emitting light by being excited by a laser beam emitted from the laser element; and
an LED.
18. The lighting device according to claim 1, wherein:
one of either the first light source section or the second light source section includes a laser element and a fluorescent material for emitting green light by being excited by a laser beam emitted from the laser element; and
the other of the first light source section and the second light source section includes an LED that emits green light.
19. The lighting device according to claim 1, wherein at least one of either the first light source section or the second light source section includes:
a laser element;
a fluorescent material for emitting green light by being excited by a laser beam emitted from the laser element; and
an LED.
20. A projection type image display apparatus comprising:
a lighting device according to claim 1;
an image display element on which light emitted from the lighting device is incident and that modulates the incident light in accordance with a video signal; and
a projection lens for projecting onto a screen the light modulated by the image display element.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A photographing optical lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric;
a third lens element with negative refractive power having a concave image-side surface on which at least one inflection point is formed, the object-side and image-side surfaces thereof being aspheric; and
a stop disposed between an imaged object and the second lens element; wherein there are only three lens elements with refractive power; and wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a thickness of the first lens element near the optical axis is CT1, a thickness of the second lens element near the optical axis is CT2, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relations: |V1\u2212V2|<35, |V1\u2212V3|<15, 0.10 mm<CT1<1.30 mm, 0.10 mm<CT2<1.00 mm, \u221210.0<(R1R2)*10 <\u22120.61.
2. The photographing optical lens assembly according to claim 1, wherein the second and third lens elements are made of plastic material.
3. The photographing optical lens assembly according to claim 2, wherein at least one of the object-side and image-side surfaces of the first lens element is aspheric, and wherein the third lens element has a convex object-side surface.
4. The photographing optical lens assembly according to claim 2, wherein a focal length of the photographing optical lens assembly is f, a focal length of the first lens element is f1, and they satisfy the relation: 1.00<ff1<2.00.
5. The photographing optical lens assembly according to claim 4, wherein the focal length of the photographing optical lens assembly is f, the focal length of the first lens element is f1, and they satisfy the relation: 1.20<ff1<1.70.
6. The photographing optical lens assembly according to claim 2, wherein the thickness of the second lens element near the optical axis is CT2, the focal length of the photographing optical lens assembly is f, and they satisfy the relation: 0.05<CT2f<0.22.
7. The photographing optical lens assembly according to claim 6, wherein the thickness of the second lens element near the optical axis is CT2, the focal length of the photographing optical lens assembly is f, and they satisfy the relation: 0.05<CT2f<0.19.
8. The photographing optical lens assembly according to claim 3, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: \u221210.0<(R1R2)*10<\u22122.0.
9. The photographing optical lens assembly according to claim 2, wherein the photographing optical lens assembly is provided with a stop and an electronic sensor for image formation of an imaged object, wherein the stop is disposed between the imaged object and the first lens element, and wherein a spacing near the optical axis between the stop and the electronic sensor is SL, a spacing near the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they
satisfy the relation: 0.93<SLTTL<1.07.
10. The photographing optical lens assembly according to claim 9, wherein the radius of curvature of the object-side surface of the first lens element is R1, the focal length of the photographing optical lens assembly is f, and they satisfy the relation: 0.25<R1f<0.63.
11. The photographing optical lens assembly according to claim 10, wherein the radius of curvature of the object-side surface of the first lens element is R1, the focal length of the photographing optical lens assembly is f, and they satisfy the relation: 0.30<R1f<0.50.
12. The photographing optical lens assembly according to claim 3, wherein a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, and they satisfy the relations: 1.52<N1<1.58, 1.52<N2<1.58, 1.52<N3<1.58.
13. The photographing optical lens assembly according to claim 12, wherein the focal length of the photographing optical lens assembly is f, a focal length of the second lens element is f2, and they satisfy the relation: 0.70<ff2<2.00.
14. The photographing optical lens assembly according to claim 13, wherein the focal length of the second lens element is f2, a focal length of the third lens element is f3, and they satisfy the relation: \u22121.5<f2f3 <\u22120.5.
15. The photographing optical lens assembly according to claim 3, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation: |V1\u2212V2|<15.
16. The photographing optical lens assembly according to claim 3, wherein the focal length of the photographing optical lens assembly is f, an entrance pupil diameter of the photographing optical lens assembly is EPD, and they satisfy the relation: 1.60<fEPD<3.20.
17. The photographing optical lens assembly according to claim 3, wherein a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, and they satisfy the relation: 3.0<(R3+R4)(R3\u2212R4)<7.0.
18. The photographing optical lens assembly according to claim 2 further comprising an electronic sensor for image formation of an imaged object, wherein the spacing near the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relation: TTLImgH<2.10.
19. A photographing optical lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric;
a third lens element with negative refractive power having a concave image-side surface on which at least one inflection point is formed, the object-side and image-side surfaces thereof being aspheric; and
a stop disposed between an imaged object and the second lens element; wherein there are only three lens elements with refractive power; and wherein a thickness of the second lens element near the optical axis is CT2, a focal length of the photographing optical lens assembly is f, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and they satisfy the relations: 0.05<CT2f<0.19, \u221210.0<(R1R2)*10 <\u22120.61, |V1\u2212V2|<35, |V1\u2212V3|<35, 0.25<R1f<0.63.
20. The photographing optical lens assembly according to claim 19, wherein at least one of the object-side and image-side surfaces of the first lens element is aspheric, and wherein the third lens element has a convex object-side surface.
21. The photographing optical lens assembly according to claim 19, wherein a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, and they satisfy the relations: 1.52<N1<1.58, 1.52<N2<1.58, 1.52<N3<1.58.
22. The photographing optical lens assembly according to claim 21, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, and they satisfy the relations: |V1\u2212V2|<15, |V1\u2212V3|<15.
23. The photographing optical lens assembly according to claim 20, wherein the photographing optical lens assembly is provided with a stop and an electronic sensor for image formation of an imaged object, wherein the stop is disposed between the imaged object and the first lens element, and wherein a spacing near the optical axis between the stop and the electronic sensor is SL, a spacing near the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation: 0.93<SLTTL<1.07.
24. The photographing optical lens assembly according to claim 23, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: \u221210.0<(R1R2)*10<\u22122.0.
25. The photographing optical lens assembly according to claim 19, wherein the radius of curvature of the object-side surface of the first lens element is R1, the focal length of the photographing optical lens assembly is f, and they satisfy the relation: 0.30<R1f<0.50.