Projection zoom lens and projection display device

Abstract

A projection zoom lens has three negative, positive, and position group configuration in order from a magnification side. A first group G1 includes a positive L1, a negative meniscus lens L2, a negative lens L3, a positive L4, and a negative lens L5. The positive lens L4 and the negative lens L5 constitute a cemented lens. The second group G2 includes a biconvex lens L6 and a biconvex lens L7. The third group G3 includes an aspheric lens L8, a negative lens L9, a positive lens L10, and a positive lens L11. The first to third lens groups satisfy:

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a configuration of a projection zoom lens according to an example 1 of the invention.

FIG. 2 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 1 during varying of a power of the projection zoom lens.

FIG. 3 is a schematic view showing a configuration of a projection zoom lens according to an example 2 of the invention.

FIG. 4 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 2 during the varying of the power.

FIG. 5 is a schematic view showing a configuration of a projection zoom lens according to an example 3 of the invention.

FIG. 6 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 3 during the varying of the power.

FIG. 7 is a schematic view showing a configuration of a projection zoom lens according to an example 4 of the invention.

FIG. 8 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 4 during the varying of the power.

FIG. 9 is a schematic view showing a configuration of a projection zoom lens according to an example 5 of the invention.

FIG. 10 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 5 during the varying of the power.

FIG. 11 is a schematic view showing a configuration of a projection zoom lens according to an example 6 of the invention.

FIG. 12 is a schematic view showing a lens moving locus in the projection zoom lens according to the example 6 during the varying of the power.

FIG. 13 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 1.

FIG. 14 is a chart of transverse aberrations of the projection zoom lens of the example 1 at a wavelength of 546.07 nm at a wide-angle end.

FIG. 15 is a chart of transverse aberrations of the projection zoom lens of the example 1 at the wavelength of 546.07 nm in a middle range.

FIG. 16 is a chart of transverse aberrations of the projection zoom lens of the example 1 at the wavelength of 546.07 nm at a telephoto end.

FIG. 17 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 2.

FIG. 18 is a chart of transverse aberrations of the projection zoom lens of the example 2 at the wavelength of 546.07 nm at a wide-angle end.

FIG. 19 is a chart of transverse aberrations of the projection zoom lens of the example 2 at the wavelength of 546.07 nm in a middle range.

FIG. 20 is a chart of transverse aberrations of the projection zoom lens of the example 2 at the wavelength of 546.07 nm at a telephoto end.

FIG. 21 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 3.

FIG. 22 is a chart of transverse aberrations of the projection zoom lens of the example 3 at the wavelength of 546.07 nm at a wide-angle end.

FIG. 23 is a chart of transverse aberrations of the projection zoom lens of the example 3 at the wavelength of 546.07 nm in a middle range.

FIG. 24 is a chart of transverse aberrations of the projection zoom lens of the example 3 at the wavelength of 546.07 nm at a telephoto end.

FIG. 25 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 4.

FIG. 26 is a chart of transverse aberrations of the projection zoom lens of the example 4 at the wavelength of 546.07 nm at a wide-angle end.

FIG. 27 is a chart of transverse aberrations of the projection zoom lens of the example 4 at the wavelength of 546.07 nm in a middle range.

FIG. 28 is a chart of transverse aberrations of the projection zoom lens of the example 4 at the wavelength of 546.07 nm at a telephoto end.

FIG. 29 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 5.

FIG. 30 is a chart of transverse aberrations of the projection zoom lens of the example 5 at the wavelength of 546.07 nm at a wide-angle end.

FIG. 31 is a chart of transverse aberrations of the projection zoom lens of the example 5 at the wavelength of 546.07 nm in a middle range.

FIG. 32 is a chart of transverse aberrations of the projection zoom lens of the example 5 at the wavelength of 546.07 nm at a telephoto end.

FIG. 33 is an aberration chart showing various aberrations (spherical aberration, astigmatism, distortion, and lateral color) of the projection zoom lens of the example 6.

FIG. 34 is a chart of transverse aberrations of the projection zoom lens of the example 6 at the wavelength of 546.07 nm at a wide-angle end.

FIG. 35 is a chart of transverse aberrations of the projection zoom lens of the example 6 at the wavelength of 546.07 nm in a middle range.

FIG. 36 is a chart of transverse aberrations of the projection zoom lens of the example 6 at the wavelength of 546.07 nm at a telephoto end.

FIG. 37 is a schematic configurative view of a projection display device according to an embodiment of the invention.

Claims

1. A projection zoom lens comprises in order from a magnification side: a first lens group having a negative refractive power;a second lens group having a positive refractive power; anda third lens group for an aberration correction, wherein:all the first to third lens groups are configured to be moving groups, respectively,the second lens group and the third lens group are configured to move to the magnification side during varying of a power of the zoom lens from a wide-angle end to a telephoto end, andthe first to third lens groups satisfy: |M3/f3|<|M1/f1|<|M2/f2|  (1)0.40<M2/f2|<0.80  (2)

2. The lens according to claim 1, wherein: the second lens group includes two or more positive lenses, anda refractive index Npd of a glass material constituting the positive lens disposed on a most magnification side among the two or more positive lenses with respect to d-line satisfies: Npd>1.70  (3)

3. The lens according to claim 2, wherein an Abbe number νpd of the glass material constituting the positive lens on the most magnification side among the two or more positive lenses with respect to the d-line satisfies: νpd>40  (4)

4. The lens according to claim 1, wherein: the third lens group includes at least one negative lens, anda refractive index Nnd of a glass material, which constitutes the negative lens having the largest refractive power among the at least one negative lens, with respect to d-line satisfies: Nnd>1.75  (5)

5. The lens according to claim 1, wherein a lens, which is disposed on a most reduction side of the third lens group, is a positive lens whose convex surface is directed to the reduction side.

6. The lens according to claim 2, wherein a lens, which is disposed on a most reduction side of the third lens group, is a positive lens whose convex surface is directed to the reduction side.

7. The lens according to claim 3, wherein a lens, which is disposed on a most reduction side of the third lens group, is a positive lens whose convex surface is directed to the reduction side.

8. The lens according to claim 4, wherein a lens, which is disposed on a most reduction side of the third lens group, is a positive lens whose convex surface is directed to the reduction side.

9. The lens according to claim 1, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

10. The lens according to claim 2, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

11. The lens according to claim 3, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

12. The lens according to claim 4, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

13. The lens according to claim 5, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

14. The lens according to claim 6, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

15. The lens according to claim 7, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

16. The lens according to claim 8, wherein at least one surface of one of the lenses of the third lens group is formed of an aspheric surface.

17. A projection display device comprising: a light source;a light valve;an illumination optical portion that guides a luminous flux from the light source to the light valve; andthe projection zoom lens according to claim 1, wherein:the light valve optically modulates the luminous flux from the light source, andthe projection zoom lens projects the modulated luminous flux onto a screen.

18. A projection display device comprising: a light source;a light valve;an illumination optical portion that guides a luminous flux from the light source to the light valve; andthe projection zoom lens according to claim 2, wherein:the light valve optically modulates the luminous flux from the light source, andthe projection zoom lens projects the modulated luminous flux onto a screen.

19. A projection display device comprising: a light source;a light valve;an illumination optical portion that guides a luminous flux from the light source to the light valve; andthe projection zoom lens according to claim 3, wherein:the light valve optically modulates the luminous flux from the light source, andthe projection zoom lens projects the modulated luminous flux onto a screen.

20. A projection display device comprising: a light source;a light valve;an illumination optical portion that guides a luminous flux from the light source to the light valve; andthe projection zoom lens according to claim 4, wherein:the light valve optically modulates the luminous flux from the light source, andthe projection zoom lens projects the modulated luminous flux onto a screen.