Zoom lens system
AssigneePanavision International, L.P.
InventorIain A. Neil
Life of this patent
Estimating the term…
Abstract
A zoom lens system is disclosed. The zoom lens system forms a final image of an object and a first intermediate real image between the object and the final image. The zoom lens system includes a first optical unit located between the object and the first intermediate real image. The first optical unit comprises at least one optical subunit which is moved to change the size (magnification) of the first intermediate real image. The zoom lens system also includes a second optical unit located between the first intermediate real image and the final image, at least a portion of which is moved to change the size (magnification) of the final image. The zoom lens system provides a wide zoom range of focal lengths with continuous zooming between the focal lengths.
Claims11
An infrared zoom lens system for forming a final image of an object, said system having an object side and an image side and forming a first intermediate real image between the object and the final image, said system comprising:
- a first lens group including at least two lens elements and located between the object and the first intermediate real image, said first lens group comprising at least one zoom subgroup which is moved to change the size (magnification) of the first intermediate real image;
- a second lens group including at least two lens elements and located between the first intermediate real image and the final image, at least a portion of which is moved to change the size (magnification) of the final image;
- and
- an optical stop located between the intermediate image and the final image;
- wherein off-axis field beam chief rays first cross an optical axis of the infrared zoom lens system on the object side of the intermediate image and then cross the optical axis again at the optical stop;
- and
- wherein a ratio of a maximum off-axis field beam rim ray to an axial field beam rim ray at a lens surface of the first lens group adjacent to object space at a longest focal length of the zoom lens system is less than about 1.25.
An infrared zoom lens system for forming a final image of an object, said system having an object side and an image side and forming a first intermediate real image between the object and the final image, said system comprising:
- a first lens group including a first five lens elements and located between the object and the first intermediate real image, said first lens group comprising at least one zoom subgroup which is moved to change the size (magnification) of the first intermediate real image;
- a second lens group including a second five lens elements and located between the first intermediate real image and the final image, at least a portion of which is moved to change the size (magnification) of the final image;
- and
- an optical stop located between the intermediate image and the final image;
- wherein off-axis field beam chief rays first cross an optical axis of the infrared zoom lens system on the object side of the intermediate image and then cross the optical axis again at the optical stop;
- wherein a ratio of a maximum off-axis field beam rim ray to an axial field beam rim ray at a lens surface of the first lens group adjacent to object space at a longest focal length of the zoom lens system is less than about 1.25;
- and
- wherein lens element surfaces, a location of an object on the object side identified as (Object), a location of the optical stop identified as (Stop), a location of the final image identified as (Image), radii of corresponding surfaces, distances from one surface to a next surface, material between a corresponding surface and the next surface, and a maximum diametric diameter of light rays passing through the corresponding surface have the following order, relationships and characteristics:
- Radius of
- Thickness or
- Aperture
- Sub-
- Zoom
- Curvature
- Separation
- Refractive
- Diameter
- Item
- Group
- Group
- Surface
- Position
- (mm)
- (mm)
- Material
- (mm)
- S0 (Object)
- Infinity
- 25.000
- 120
- 151
- 152
- S1
- All
- 215.343
- 28.544
- Silicon
- 317.642
- S2
- Z1
- 269.106*
- 9.864
- 308.262
- Z2
- 57.468
- Z3
- 108.517
- Z4
- 117.957
- Z5
- 132.937
- Z6
- 135.615
- 122
- 151
- 153
- S3
- All
- 637.888
- 9.000
- Germanium
- 187.169
- S4
- All
- 247.226
- 11.642
- 174.123
- 124
- 151
- 153
- S5
- All
- 228.929
- 8.000
- Silicon
- 166.617
- S6
- Z1
- 161.278
- 244.587
- 157.148
- Z2
- 220.842
- Z3
- 150.487
- Z4
- 74.335
- Z5
- 22.911
- Z6
- 11.974
- 126
- 151
- 154
- S7
- All
- 288.682
- 15.448
- Silicon
- 176.490
- S8
- Z1
- 1321.765*
- 212.856
- 174.473
- Z2
- 233.828
- Z3
- 270.854
- Z4
- 362.883
- Z5
- 443.606
- Z6
- 460.309
- 128
- 151
- 155
- S9
- All
- 83.756*
- 11.053
- Silicon
- 105.651
- S10
- Z1
- 159.357
- 160.888
- 103.666
- Z2
- 115.791
- Z3
- 97.933
- Z4
- 72.886
- Z5
- 28.278
- Z6
- 20.171
- S11 (dummy)
- Z1
- Infinity
- 74.210
- Z2
- 46.803
- Z3
- 3.191
- Z4
- 3.253
- Z5
- 57.219
- Z6
- 19.714
- 130
- 156
- 157
- S12
- All
- −32.997
- 12.500
- Silicon
- 29.867
- S13
- Z1
- −45.308
- 1.830
- 36.698
- Z2
- 29.317
- Z3
- 74.625
- Z4
- 73.197
- Z5
- 0.800
- Z6
- 1.897
- 132
- 156
- 158
- S14
- All
- −28.877
- 10.206
- Germanium
- 23.882
- S15
- Z1
- −44.286
- 1.917
- 30.694
- Z2
- 0.995
- Z3
- 0.100
- Z4
- 0.926
- Z5
- 4.846
- Z6
- 18.907
- 134
- 156
- 159
- S16
- All
- 6208.244
- 13.998
- Germanium
- 37.741
- S17
- All
- 264.338
- 0.400
- 40.076
- 136
- S18
- All
- 171.855
- 11.452
- Silicon
- 41.269
- S19
- All
- −84.226
- 0.400
- 42.354
- 138
- S20
- All
- −128.685
- 1.000
- Silicon
- 41.072
- S21
- Z1
- −156.416*
- 1.254
- 41.075
- Z2
- 1.696
- Z3
- 0.750
- Z4
- 1.699
- Z5
- 15.734
- Z6
- 38.441
- S22 (Stop)
- All
- Infinity
- 79.221
- S23 (Image)
- All
- Infinity
- 0.000.
Dependencies are inferred from the claim text.