Re-imaging optical system

Claim 2

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image of desired size, including, in succession from the object side, a first lens unit which is a field lens constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other, a second lens unit comprising forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power, and an optical member for making said second image formed by said re-imaging optical system erect, said re-imaging optical system satisfying the following condition: 1.5|β|<|β.sub.F |<2.5|β|, where β: magnification of said re-imaging optical system; β F : magnification of said forward sub-unit.

Claim 3

A re-imaging optical system according to claim 1, further satisfying the following condition: ##EQU2## where f F : focal length of said forward sub-unit; f R : focal length of said rearward lens sub-unit; e 2 : the spacing between the image side principal point of said forward sub-unit and the object side principal point of said second rearward lens sub-unit.

Claim 4

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image of desired size, including, in succession from the object side, a first lens unit which is a field lens constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other, a second lens unit comprising forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power, and an optical member for making said second image formed by said re-imaging optical system erect, said re-imaging optical system being characterized by the following data: ______________________________________ Radius of Center thick- Abbe curvature ness and Refractive number No. r space d index n ν ______________________________________ 1 -1661.828 5.400 1.90265 35.76 2 -64.690 0.100 G.sub.1 3 44.991 5.800 1.90265 35.76 4 158.416 46.342 5 -265.897 1.000 1.51118 50.91 6 15.822 3.500 7 -40.800 1.000 1.51118 50.91 G.sub.2F 8 24.101 3.000 1.90265 35.76 9 -93.381 0.996 10 ∞ 76.620 1.56883 56.04 P.sub.1 11 ∞ 2.000 12 107.999 1.700 1.86074 23.00 13 29.543 5.200 1.67025 57.58 14 -100.572 3.670 G.sub.2R 15 70.377 3.000 1.90265 35.76 16 -138.283 3.228 ______________________________________ β = -0.26416 β.sub.F = 0.54663 e.sub.2 = 90.70367 f.sub.F = -55.58730 f.sub.R = 37.76313 ##STR3## ______________________________________

Claim 5

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image of desired size, including, in succession from the object side, a first lens unit which is a field lens constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other, a second lens unit comprising forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power, and an optical member for making said second image formed by said re-imaging optical system erect, said re-imaging optical system being characterized by the following data: ______________________________________ Radius of Center thick- Abbe curvature ness and Refractive number No. r space d index n ν ______________________________________ 1 -1661.828 5.400 1.90265 35.76 2 -64.690 0.100 G.sub.1 3 44.991 5.800 1.90265 35.76 4 158.416 46.342 5 -265.897 1.000 1.51118 50.91 6 15.822 3.500 7 -40.800 1.000 1.51118 50.91 G.sub.2F 8 24.101 3.000 1.90265 35.76 9 -93.381 0.996 10 ∞ 76.620 1.56883 56.04 P.sub.1 11 ∞ 2.000 12 107.999 1.700 1.86074 23.00 13 29.543 5.200 1.67025 57.58 14 -100.572 3.670 G.sub.2R 15 70.377 3.000 1.90265 35.76 16 -138.283 3.228 ______________________________________ β = -0.26416 β.sub.F = 0.54663 e.sub.2 = 90.70367 f.sub.F = -55.58730 f.sub.R = 37.76313 ##STR3## ______________________________________

Claim 6

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image of desired size, including, in succession from the object side, a first lens unit which is a field lens constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other, a second lens unit comprising forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power, and an optical member for making said second image formed by said re-imaging optical system erect, said re-imaging optical system being characterized by the following data: ______________________________________ Radius of Center thick- Abbe curvature nesss and Refractive number No. r space d index n ν ______________________________________ 1 1555.419 5.50 1.90265 35.7 2 -103.087 1.00 G.sub.1 3 41.840 8.50 1.90265 35.7 4 432.930 25.50 5 93.787 6.00 1.86074 23.0 6 -51.472 1.50 7 -30.505 1.50 1.51680 64.1 G.sub.2F 8 13.863 10.00 9 -14.181 1.50 1.72825 28.3 10 93.203 7.00 1.79668 45.4 11 -18.807 1.50 12 ∞ 79.00 1.90265 35.7 P.sub.1 13 ∞ 31.10 14 169.708 2.50 1.61266 44.4 15 108.088 5.00 1.49782 82.6 16 -46.362 .70 G.sub.2R 17 53.378 5.00 1.59319 67.9 18 -44.517 2.00 1.84042 43.3 19 -272.067 13.64 20 ∞ 1.50 1.54440 70.7 3-color 21 ∞ 7.00 1.51680 64.1 resolv- 22 " 50.50 1.69680 55.6 ing 23 ∞ 10.00 1.51680 64.1 prism 24 ∞ 10.23 ______________________________________ β = -0.3697 β.sub.F = 0.673 e.sub.2 = 105.4162 f.sub.F = -57.3 f.sub.R = 45.992 ##STR4## ______________________________________

Claim 7

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image of desired size, including, in succession from the object side, a first lens unit which is a field lens constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other, a second lens unit comprising forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power, and an optical member for making said second image formed by said re-imaging optical system erect, said re-imaging optical system being characterized by the following data: ______________________________________ Radius of Center thick- Abbe curvature nesss and Refractive number No. r space d index n ν ______________________________________ 1 1555.419 5.50 1.90265 35.7 2 -103.087 1.00 G.sub.1 3 41.840 8.50 1.90265 35.7 4 432.930 25.50 5 93.787 6.00 1.86074 23.0 6 -51.472 1.50 7 -30.505 1.50 1.51680 64.1 G.sub.2F 8 13.863 10.00 9 -14.181 1.50 1.72825 28.3 10 93.203 7.00 1.79668 45.4 11 -18.807 1.50 12 ∞ 79.00 1.90265 35.7 P.sub.1 13 ∞ 31.10 14 169.708 2.50 1.61266 44.4 15 108.088 5.00 1.49782 82.6 16 -46.362 .70 G.sub.2R 17 53.378 5.00 1.59319 67.9 18 -44.517 2.00 1.84042 43.3 19 -272.067 13.64 20 ∞ 1.50 1.54440 70.7 3-color 21 ∞ 7.00 1.51680 64.1 resolv- 22 " 50.50 1.69680 55.6 ing 23 ∞ 10.00 1.51680 64.1 prism 24 ∞ 10.23 ______________________________________ β = -0.3697 β.sub.F = 0.673 e.sub.2 = 105.4162 f.sub.F = -57.3 f.sub.R = 45.992 ##STR4## ______________________________________

Claim 8

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image, wherein said re-imaging optical system is detachable from an apparatus which transforms said second image into a picture signal, comprising: a first lens unit, which has a positive refractive power, for constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugated with each other; a second lens unit having forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power; and an optical system disposed between said forward and said rearward sub-units; said first lens unit, said forward sub-unit, said optical system, and said rearward sub-unit being disposed in succession from the object side, said optical system causing said second image formed by said re-imaging optical system to be erect with respect to said first image without re-imaging said first image into another image in the optical path between said forward and said rearward sub-units.

Claim 9

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image, wherein said re-imaging optical system is detachable from an apparatus which transforms said second image into a picture signal, comprising: a first lens unit, which has a positive refractive power, for constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugated with each other; a second lens unit having forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power; and an optical system disposed between said forward and said rearward sub-units; said first lens unit, said forward sub-unit, said optical system, and said rearward sub-unit being disposed in succession from the object side, said optical system causing said second image formed by said re-imaging optical system to be erect with respect to said first image without re-imaging said first image into another image in the optical path between said forward and said rearward sub-units.

Claim 10

A re-imaging optical system according to claim 5, wherein said optical system is an erecting prism.

Claim 11

A re-imaging optical system according to claim 6, wherein said re-imaging optical system reduces said first image to said second image.

Claim 12

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image to which said first image is reduced comprising: a first lens unit, which has a positive refractive power, for constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other; a second lens unit having forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power; and an optical system disposed between said forward and said rearward sub-units; said first lens unit, said forward sub-unit, said optical system, and said rearward sub-unit being disposed in succession from the object side, said optical system causing said second image formed by said re-imaging optical system to be erect with respect to said first image without re-imaging said first image into another image in the optical path between said forward and said rearward sub-units.

Claim 13

A re-imaging optical system for re-imaging a first image formed by an objective lens into a second image to which said first image is reduced comprising: a first lens unit, which has a positive refractive power, for constructing the exit pupil of said objective lens and the entrance pupil of said re-imaging optical system so as to be substantially conjugate with each other; a second lens unit having forward and rearward sub-units, said forward sub-unit having a negative refractive power and said rearward sub-unit having a positive refractive power; and an optical system disposed between said forward and said rearward sub-units; said first lens unit, said forward sub-unit, said optical system, and said rearward sub-unit being disposed in succession from the object side, said optical system causing said second image formed by said re-imaging optical system to be erect with respect to said first image without re-imaging said first image into another image in the optical path between said forward and said rearward sub-units.

Claim 14

A re-imaging optical system according to claim 8, wherein said optical system is an erecting prism.