Varifocal optical system

Claim 2

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movement laws which are different from each other, the attachment comprises a first and a second partial system, each said partial system has two displaceable said lens members, at least said first partial system is afocal, a base objective, said first partial system in the attachment comprises, a stationary first member, a means comprising a second member displaceable for the focal length variation, means constituting a third member for bringing about an image position compensation, said second partial system comprises a fourth member following said third member, a moveable fifth lens member, said fourth member constitutes means for compensating wandering of the image which is produced by movement of said fifth lens member, said second partial system includes an additional stationary member adjacent said base objective.

Claim 3

The optical system as set forth in claim 1, wherein the movement laws for displacing said second and third lens members are related to each other.

Claim 4

The optical system as set forth in claim 1, wherein the four said lens members are adjacent one another.

Claim 5

The optical system as set forth in claim 1, wherein said means constitute a displacement device for said lens members which are moveable along the optical axis with the focal length adjustment, said displacement device comprises a rotatably mounted cam body, said cam body is operatively coordinated to said second and third lens members, said cam body in radial direction has two cam section means each extending over 180° thereof for controlling the movements of said second and third lens members, respectively.

Claim 6

The optical system as set forth in claim 4, wherein both said cam section means are arranged axially opposite.

Claim 7

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movement laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the indexes of refraction up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r 1[d] n.sub.d v.sub.d ______________________________________ aspheric 5.0 1.492 54.67 81.69 5.0 88.00 3.5 1.784 26.08 43.00 8.0 -140.00 3.0 1.784 26.08 120.00 8.0 -31.00 2.0 1.784 26.08 -83.76 1.sub.I -80.00 5.5 1.744 44.77 -35.32 0.1 196.20 6.0 1.744 44.77 -85.00 0.1 54.00 6.0 1.744 44.77 886.95 1.sub.II -45.00 1.0 1.781 37.09 58.79 1.sub.III -25.38 1.0 1.781 37.09 ∞ 1.sub.IV 348.10 4.2 1.563 60.80 -27.00 0.1 37.26 3.4 1.563 60.80 ∞ 1.sub.V -40.00 1.65 1.781 37.09 78.85 2.0 ∞ 5.0 1.568 56.13 ∞ 2.0 33.33 3.3 1.640 60.10 -194.60 0.1 22.14 3.8 1.640 60.10 45.29 5.1 -21.14 3.7 1.846 23.83 21.14 4.15 -408.30 5.0 1.691 54.71 -14.90 0.1 25.87 3.0 1.691 54.71 -300.00 16.18 ______________________________________ whereby r is the radius, d is the lens thickness, n.sub.d is the index of refraction and v.sub.d is the Abbe number, whereby the non-spherical-ness is defined by the following formula: ______________________________________ aspheric: R a.sub.2 a.sub.4 a.sub.6 ______________________________________ 30.0 0 4.10.sup.-6 1.10.sup.-9 ______________________________________

Claim 8

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movement laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the indexes of refraction up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r 1[d] n.sub.d v.sub.d ______________________________________ aspheric 5.0 1.492 54.67 81.69 5.0 88.00 3.5 1.784 26.08 43.00 8.0 -140.00 3.0 1.784 26.08 120.00 8.0 -31.00 2.0 1.784 26.08 -83.76 1.sub.I -80.00 5.5 1.744 44.77 -35.32 0.1 196.20 6.0 1.744 44.77 -85.00 0.1 54.00 6.0 1.744 44.77 886.95 1.sub.II -45.00 1.0 1.781 37.09 58.79 1.sub.III -25.38 1.0 1.781 37.09 ∞ 1.sub.IV 348.10 4.2 1.563 60.80 -27.00 0.1 37.26 3.4 1.563 60.80 ∞ 1.sub.V -40.00 1.65 1.781 37.09 78.85 2.0 ∞ 5.0 1.568 56.13 ∞ 2.0 33.33 3.3 1.640 60.10 -194.60 0.1 22.14 3.8 1.640 60.10 45.29 5.1 -21.14 3.7 1.846 23.83 21.14 4.15 -408.30 5.0 1.691 54.71 -14.90 0.1 25.87 3.0 1.691 54.71 -300.00 16.18 ______________________________________ whereby r is the radius, d is the lens thickness, n.sub.d is the index of refraction and v.sub.d is the Abbe number, whereby the non-spherical-ness is defined by the following formula: ______________________________________ aspheric: R a.sub.2 a.sub.4 a.sub.6 ______________________________________ 30.0 0 4.10.sup.-6 1.10.sup.-9 ______________________________________

Claim 9

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movement laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the refractive indexes up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r d[1] n.sub.d v.sub.d ______________________________________ 129.83 5.0 1.788 47.39 ∞ 0.05 49.00 12.5 1.719 50.41 -73.10 2.0 1.721 29.25 65.84 1.sub.I 150.0 1.85 1.620 60.33 31.05 2.85 114.0 1.5 1.620 60.33 26.10 5.5 -53.0 6.5 1.784 26.08 -18.5 1.0 1.788 47.39 -3076.27 1.sub.II -155.0 1.5 1.625 35.70 52.0 1.25 91.0 9.0 1.696 56.18 -37.39 1.sub.III 28.9 7.5 1.589 61.27 -62.5 2.0 1.620 36.37 75.0 1.sub.IV ∞ 1.35 1.691 54.71 28.75 2.5 -142.0 0.85 1.620 60.33 9.4 3.5 1.620 36.37 28.63 1.sub.V 935.0 2.0 1.647 33.85 28.75 6.0 1.623 58.06 -44.60 1.0 ∞ 5.0 1.568 56.13 ∞ 3.3 39.15 7.0 1.744 44.77 248.55 12.35 -50.0 13.75 1.805 25.43 50.0 1.55 667.0 7.45 1.670 47.11 -38.7 0.25 40.0 7.25 1.620 60.33 -194.55 32.10 ______________________________________

Claim 10

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movement laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the refractive indexes up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r d[1] n.sub.d v.sub.d ______________________________________ 129.83 5.0 1.788 47.39 ∞ 0.05 49.00 12.5 1.719 50.41 -73.10 2.0 1.721 29.25 65.84 1.sub.I 150.0 1.85 1.620 60.33 31.05 2.85 114.0 1.5 1.620 60.33 26.10 5.5 -53.0 6.5 1.784 26.08 -18.5 1.0 1.788 47.39 -3076.27 1.sub.II -155.0 1.5 1.625 35.70 52.0 1.25 91.0 9.0 1.696 56.18 -37.39 1.sub.III 28.9 7.5 1.589 61.27 -62.5 2.0 1.620 36.37 75.0 1.sub.IV ∞ 1.35 1.691 54.71 28.75 2.5 -142.0 0.85 1.620 60.33 9.4 3.5 1.620 36.37 28.63 1.sub.V 935.0 2.0 1.647 33.85 28.75 6.0 1.623 58.06 -44.60 1.0 ∞ 5.0 1.568 56.13 ∞ 3.3 39.15 7.0 1.744 44.77 248.55 12.35 -50.0 13.75 1.805 25.43 50.0 1.55 667.0 7.45 1.670 47.11 -38.7 0.25 40.0 7.25 1.620 60.33 -194.55 32.10 ______________________________________

Claim 11

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movememt laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the refractive indexes up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r d[1] n.sub.d v.sub.d ______________________________________ 124.0 ∞ 6.5 1.744 44.77 ∞ 0.1 65.54 14.0 1.719 50.41 -54.0 2.0 1.721 29.25 116.65 1.sub.I 150.0 1.85 1.623 58.06 31.05 3.5 114.0 1.5 1.623 58.06 26.10 6.5 -53.0 6.5 1.784 26.08 -18.5 1.0 1.788 47.39 -838.1 1.sub.II -428.14 1.5 1.784 26.08 57.0 1.25 91.0 7.0 1.691 54.71 -37.36 1.sub.III 28.9 5.0 1.589 61.27 71.46 1.sub.IV ∞ 1.35 1.691 54.71 28.75 2.5 -142.0 0.85 1.620 60.33 9.4 3.5 1.620 36.37 28.63 1.sub.V 935.0 1.0 1.623 58.06 ∞ 4.0 1.623 58.06 -47.34 1.0 ∞ 5.0 1.568 56.13 ∞ 3.3 31.55 7.7 1.623 58.06 -67.50 1.4 -43.47 10.5 1.762 26.53 19.68 2.65 27.10 6.5 1.788 47.39 -44.44 30.46 ______________________________________

Claim 12

An optical system for extremely high focal length variation, comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change, comprising (viewed in the incoming direction of the light) first and fourth displaceable lens members, second and third lens members, means for displacing said first and fourth displaceable lens members according to the same movement law, means for displacing said second and third lens members according to movememt laws which are different from each other, the optical system having the following data, within a deviation of the curvature of individual surfaces and of the thicknesses of up to ±10% of the optical power of the corresponding member, of the refractive indexes up to ±0.03 and of the Abbe numbers up to ±5: ______________________________________ r d[1] n.sub.d v.sub.d ______________________________________ 124.0 ∞ 6.5 1.744 44.77 ∞ 0.1 65.54 14.0 1.719 50.41 -54.0 2.0 1.721 29.25 116.65 1.sub.I 150.0 1.85 1.623 58.06 31.05 3.5 114.0 1.5 1.623 58.06 26.10 6.5 -53.0 6.5 1.784 26.08 -18.5 1.0 1.788 47.39 -838.1 1.sub.II -428.14 1.5 1.784 26.08 57.0 1.25 91.0 7.0 1.691 54.71 -37.36 1.sub.III 28.9 5.0 1.589 61.27 71.46 1.sub.IV ∞ 1.35 1.691 54.71 28.75 2.5 -142.0 0.85 1.620 60.33 9.4 3.5 1.620 36.37 28.63 1.sub.V 935.0 1.0 1.623 58.06 ∞ 4.0 1.623 58.06 -47.34 1.0 ∞ 5.0 1.568 56.13 ∞ 3.3 31.55 7.7 1.623 58.06 -67.50 1.4 -43.47 10.5 1.762 26.53 19.68 2.65 27.10 6.5 1.788 47.39 -44.44 30.46 ______________________________________