Zoom lens device and optical apparatus provided with the same
First Claim
Patent Images
1. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
- a first lens unit having a positive refractive power and including a diffraction optical element;
a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image;
a stationary third lens unit having a positive refractive power; and
a fourth lens unit, wherein during zooming said fourth lens unit is moved to correct changes in an image plane occurring as the magnification changes, wherein the condition;
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Abstract
A zoom lens device including a diffraction optical element constructed in a new way. In a basic form of the invention, the zoom lens device includes in order of lens units from a long conjugate side, at least a first lens unit including the diffraction optical element, a second lens unit which is moved during zooming in order to change the size of an image, and a third lens unit. In this zoom lens device, during zooming at least one of the lens units from the third lens unit onwards is moved in order to correct a change in an image plane which occurs as the magnification changes.
100 Citations
104 Claims
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1. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
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a first lens unit having a positive refractive power and including a diffraction optical element;
a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image;
a stationary third lens unit having a positive refractive power; and
a fourth lens unit, wherein during zooming said fourth lens unit is moved to correct changes in an image plane occurring as the magnification changes, wherein the condition;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
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a first lens unit having a positive refractive power and including a diffraction optical element;
a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image; and
a third lens unit having a positive refractive power, wherein during zooming (i) said third lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said third lens unit, at least one lens unit of said third lens unit and said one or more lens unit, is moved to correct changes in an image plane occurring as the magnification changes, and wherein said diffraction element comprises a first annular diffraction grating, and a second annular diffraction grating formed on said first annular diffraction grating, with said first annular diffraction grating and said second annular diffraction grating being made of different materials. - View Dependent Claims (103)
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17. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
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a first lens unit;
a second lens unit which is moved during zooming in order to change the size of an image, said second lens unit including a diffraction optical element;
a third lens unit which is stationary during zooming; and
a fourth lens unit, wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, is moved in order to correct a change in an image plane which occurs as the magnification changes, and wherein the condition;
- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 97)
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27. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
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a first lens unit;
a second lens unit which is moved during zooming in order to change the size of an image;
a third lens unit which is stationary during zooming and which includes a diffraction optical element; and
a fourth lens unit;
wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, is moved to correct a change in an image plane which occurs as the magnification changes. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 98)
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31. A zoom lens device according to claim 27, wherein the condition:
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32. A zoom lens device according to claim 27, wherein the conditions:
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33. A zoom lens device according to claim 27, wherein the condition:
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34. A zoom lens device according to claim 27, wherein the condition:
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35. A zoom lens device according to claim 27, wherein the condition:
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36. A zoom lens device according to claim 27, wherein the condition:
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37. A zoom lens device according to claim 27, wherein said first lens unit has a positive refractive power, said second lens unit has a negative refractive power, said third lens unit has a positive refractive power, and said fourth lens unit has a negative refractive power.
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38. A zoom lens device according to claim 27, wherein said diffraction optical element comprises a first annular diffraction grating and a second annular diffraction grating formed on said first annular diffraction grating, with said first annular diffraction grating and said second annular diffraction grating being made of different materials.
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98. A zoom lens device according to claim 27, wherein during zooming said fourth lens unit is moved.
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39. A zoom lens device comprising in order of lens units from a long conjugate side, at least:
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a first lens unit;
a second lens unit which is moved during zooming in order to change the size of an image;
a third lens unit which is stationary during zooming; and
a fourth lens unit including a diffraction optical element;
wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, is moved to correct changes in an image plane occurring as the magnification changes. - View Dependent Claims (40, 41, 42, 43, 80, 99)
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44. An optical apparatus, comprising:
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a zoom lens device; and
means for holding said zoom lens device, wherein said zoom lens device comprises in order of lens units from a long conjugate side, at least;
(a) a first lens unit having a positive refractive power and including a diffraction optical element;
(b) a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image;
(c) a stationary third lens unit having a positive refractive power; and
(d) a fourth lens unit, wherein during zooming said fourth lens unit is moved to correct changes in an image plane occurring as the magnification changes, wherein the condition;
- View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. An optical apparatus comprising in order of lens units from a long conjugate side, at least:
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a first lens unit having a positive refractive power and including a diffraction optical element;
a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image; and
a third lens unit having a positive refractive power, wherein during zooming (i) said third lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said third lens unit, at least one lens unit of said third lens unit and said one or more lens unit, is moved to correct changes in an image plane occurring as the magnification changes, and wherein said diffraction element comprises a first annular diffraction grating, and a second annular diffraction grating formed on said first annular diffraction grating, with said first annular diffraction grating and said second annular diffraction grating being made of different materials. - View Dependent Claims (104)
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53. An optical apparatus, comprising:
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a zoom lens device; and
means for holding said zoom lens device;
wherein said zoom lens device comprises in order of lens units from a long conjugate side, at least;
(a) a first lens unit;
(b) a second lens unit which is moved during zooming in order to change the size of an image, said second lens unit including a diffraction optical element;
(c) a third lens unit which is stationary during zooming; and
(d) a fourth lens unit;
wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, is moved in order to correct a change in an image plane which occurs as the magnification changes, and wherein the condition - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 100)
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62. An optical apparatus, comprising:
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a zoom lens device; and
means for holding said zoom lens device;
wherein said zoom lens device comprises, in order of lens units from a long conjugate side, at least;
(a) a first lens unit;
(b) a second lens unit which is moved during zooming in order to change the size of an image;
(c) a third lens unit which is stationary during zooming and which includes a diffraction optical element; and
(d) a fourth lens unit;
wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, onwards is moved to correct a change in an image plane which occurs as the magnification changes. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 101)
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65. An optical apparatus according to claim 62, wherein the condition:
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66. An optical apparatus according to claim 62, wherein the conditions:
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67. An optical apparatus according to claim 62, wherein the condition:
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68. An optical apparatus according to claim 62, wherein the condition:
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69. An optical apparatus according to claim 62, wherein the condition:
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70. An optical apparatus according to claim 62, wherein the condition:
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71. An optical apparatus according to claim 62, wherein said first lens unit has a positive refractive power, said second lens unit has a negative refractive power, said third lens unit has a positive refractive power, and said fourth lens unit has a negative refractive power.
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72. An optical apparatus according to claim 62, wherein said diffraction optical element comprises a first annular diffraction grating and a second annular diffraction grating formed on said first annular diffraction grating, with said first annular diffraction grating and said second annular diffraction grating being made of different materials.
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101. An optical apparatus according to claim 62, wherein during zooming said fourth lens unit is moved.
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73. An optical apparatus, comprising:
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a zoom lens device; and
means for holding said zoom lens device;
wherein said zoom lens device comprises, in order of lens units from a long conjugate side, at least;
(a) a first lens unit;
(b) a second lens unit which is moved during zooming in order to change the size of an image;
(c) a third lens unit which is stationary during zooming; and
(d) a fourth lens unit including a diffraction optical element;
wherein during zooming (i) said fourth lens unit or (ii) in the case where there is one or more lens unit on the short conjugate side of said fourth lens unit, at least one lens unit of said fourth lens unit and said one or more lens unit, is moved to correct changes in an image plane occurring as the magnification changes. - View Dependent Claims (74, 75, 76, 102)
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76. An optical apparatus according to claim 73, wherein the following condition is met:
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102. An optical apparatus according to claim 73, wherein during zooming said fourth lens unit is moved.
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77. A zoom lens device comprising in order from the object side to the image side:
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a first lens unit having a positive refractive power, wherein said first lens unit includes from the object side to the image side a meniscus negative first lens having a convex surface facing the object side, a positive second lens, and a positive third lens;
a second lens unit having a negative refractive power, said second lens unit being moved during zooming in order to change the size of an image;
a third lens unit having a positive refractive power;
a fourth lens unit having a negative refractive power, wherein said fourth lens unit is moved during zooming; and
a fifth lens unit having a positive refractive power, wherein said first lens unit further includes a diffractive optical element. - View Dependent Claims (78, 79)
wherein during change of magnification from the wide angle end toward the telephoto end, said second lens unit moves toward the image side and said fourth lens unit moves along a locus which is convex towards the image side, wherein during focusing from a nearest object to an object at infinity, said fourth lens unit moves toward the object side, wherein said first, third, and fifth lens units are fixed, and wherein the following conditions are satisfied:
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81. A zoom lens system comprising, in order from an object side to an image side,
a first lens unit of positive optical power; -
a second lens unit of negative optical power which moves along an optical axis for zooming;
a third lens unit of positive optical power; and
a fourth lens unit which moves along an optical axis for zooming, wherein at least one of said first, second, third and fourth lens unit includes a diffraction optical element, and wherein the product of the refractive power due to the curvature of a surface corresponding to a diffraction optical surface of said diffraction optical element and the optical power due to the diffractive action of said diffraction optical surface is a positive value. - View Dependent Claims (82, 83, 84, 85, 86, 87, 89, 90, 91, 92)
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88. A camera, comprising:
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a zoom lens system for forming an image; and
an image pick-up element for receiving said image;
wherein said zoom lens system comprises in order from an object side to an image side, (a) a first lens unit of positive optical power;
(b) a second lens unit of negative optical power which moves along an optical axis for zooming;
(c) a third lens unit of positive optical power; and
(d) a fourth lens unit which moves along an optical axis for zooming, wherein at least one of said first, second, third and fourth lens units includes a diffraction optical element, and wherein the product of the refractive power due to the curvature of a surface corresponding to a diffraction optical surface of said diffraction optical element and the optical power due to the diffractive action of said diffraction optical surface is a positive value.
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93. A zoom lens system comprising, in order from the object side to the image side:
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a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power;
a third lens unit having a positive refractive power; and
a fourth lens unit having a positive or negative refractive power, wherein during zooming, said second lens unit and said fourth lens unit move and said third lens unit is stationary, and wherein a diffraction optical surface is included in said third lens unit or a diffraction optical surface is included in said fourth lens unit. - View Dependent Claims (94, 95, 96)
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Specification