Symmetrical optical lens system

Claim 2

An optical lens system, comprising in combination, a converging element, first, second and third lens means; said first lens means including a diverging compound meniscus component, said second lens means being a double concave component having radii within a proportional range of two to one, said third lens means includinG a diverging compound meniscus component, said first and third lens means being substantially identical, and means establishing said first and third lens means with said compound components of said first and third lens means substantially symmetrically disposed about said second lens means.

Claim 3

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through third components, said first component being a double convex element, said second component being a positive meniscus element, said third component being a negative meniscus compound component, said second lens means being a double concave element having radii within a proportional range of two to one, said third lens means being substantially identical to said first lens means, and means establishing said first and third lens means with said compound components of said first and third lens means symmetrically spaced from said second lens means.

Claim 4

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through third components, said first component being a double convex element, said second component being a positive meniscus element, said third component being a negative meniscus compound component, said second lens means being a double concave element having radii within a proportional range of two to one, said third lens means being substantially identical to said first lens means, and means establishing said first and third lens means with said compound components of said first and third lens means symmetrically spaced from said second lens means.

Claim 5

An optical lens system as set forth in claim 2, wherein said third component includes a positive meniscus element in contact with a negative meniscus element.

Claim 6

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing of S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1 -t4, indices of refraction N1-N4 and Abbe numbers Nu 1- Nu 4, respectively, and the optical lens system having an effective focal length of F and said indices of refraction are substantially: N1, N2 < N3.

Claim 7

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing of S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1 -t4, indices of refraction N1-N4 and Abbe numbers Nu 1- Nu 4, respectively, and the optical lens system having an effective focal length of F and said indices of refraction are substantially: N1, N2 < N3.

Claim 8

An optical lens system as set forth in claim 4 wherein said indices of refraction are substantially: N1, N2 < or = 1.52 N3 > or = 1.65.

Claim 9

An optical lens system as set forth in claim 4, wherein said indices of refraction are substantially: N1, N2 < N4, N5 < N3.

Claim 10

An optical lens system as set forth in claim 4, wherein said radii magnitudes are substantially: R8 < R5 < R3 < R1 < R2.

Claim 11

An optical lens system as set forth in claim 4, wherein said radii magnitudes are substantially: R8 < R5 < R6, R7 < R3 < R1 < R2 < R4.

Claim 12

An optical lens system as set forth in claim 4, wherein said Abbe numbers are substantially: Nu 1, Nu 2 > 75.0 Nu 4, Nu 5 > 36.0.

Claim 13

An optical lens system as set forth in claim 4, wherein said Abbe numbers are substantially: Nu 4, Nu 5 < Nu 3 < Nu 1, Nu 2.

Claim 14

An optical lens system as set forth in claim 4, wherein said thicknesses are substantially: t3 + t4 > 0.09F

Claim 15

An optical lens system as set forth in claim 4, wherein said thicknesses are substantially: t3 > 0.06 F.

Claim 16

An optical lens system as set forth in claim 4, wherein said thicknesses are substantially: t1, t2, t4 < t5 < t3. 14. An optical lens system as set forth in claim 4, wherein said spacing S4 is substantially: 0.06 F < S4 < 0.10 F.

Claim 17

An optical lens system as set forth in claim 4, wherein said spacings are substantially: S1, S2 < S4.

Claim 18

An optical lens system as set forth in claim 4, wherein said radii magnitude, said indices of refraction, said spacings, said thicknesses and said Abbe numbers are substantially: R8 < R5 < R9 < R6, R7 < R3 < R10 < R1 < R2 < R4 N1, N2 < N4, N5 < N3; N1, N2 < or = 1.52; N3 > or = 1.65 Nu 4, Nu 5 < 3 < Nu 1, Nu 2; Nu 1, Nu 2 > 75.0; Nu 4, Nu 5 > 36.0 t1, t2, t4 < t5 < t3; t3 > 0.06 F; t3 + t4 > 0.09 F S1, S2 < S4; 0.06 F < S4 < 0.10 F.

Claim 19

An optical lens system as set forth in claim 4, wherein said R9 and R10 radii are proportional to one another within a range of two to one.

Claim 20

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1 -t4, indices of refraction N1-N4 and Abbe numbers Nu 1 - Nu 4 respectively, the optical lens system having an effective focal length of F and said radii magnitudes, said indices of refraction, said spacings, said thicknesses, and said Abbe numbers being substantially: R1 +1.22 F t1 t2 t4 0.030 F R2 +2.54 F t3 0.080 F R3 +0.65 F t5 0.032 F R4 -3.99 F R5 +0.39 F N1 N2 1.49 R6 -0.62 F N3 1.69 R7 +0.62 F N4 N5 1.58 R8 -0.30 F R9 -0.62 F Nu 1 Nu 2 84.5 R10 -0.90 F Nu 3 54.7 Nu 4 Nu 5 40.8 S1 S2 0.0030 F S4 0.072 F wherein a positive radius indicates a convex surface and a negative radius indicates a concave surface.

Claim 21

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1 -t4, indices of refraction N1-N4 and Abbe numbers Nu 1 - Nu 4 respectively, the optical lens system having an effective focal length of F and said radii magnitudes, said indices of refraction, said spacings, said thicknesses, and said Abbe numbers being substantially: R1 +1.22 F t1 t2 t4 0.030 F R2 +2.54 F t3 0.080 F R3 +0.65 F t5 0.032 F R4 -3.99 F R5 +0.39 F N1 N2 1.49 R6 -0.62 F N3 1.69 R7 +0.62 F N4 N5 1.58 R8 -0.30 F R9 -0.62 F Nu 1 Nu 2 84.5 R10 -0.90 F Nu 3 54.7 Nu 4 Nu 5 40.8 S1 S2 0.0030 F S4 0.072 F wherein a positive radius indicates a convex surface and a negative radius indicates a concave surface.

Claim 22

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing of S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1-t4, indices of refraction N1-N4 and Abbe numbers Nu 1 - Nu 4, respectively, the optical lens system having an effective focal length of F and and said radii, said thicknesses, said indexes of refraction and said Abbe numbers being substantially: R1 +1.2173 F t1 t2 t4 0.02994 F R2 +2.5432 F t3 0.07985 F R3 +0.6492 F t5 0.03176 F R4 -3.9927 F R5 +0.3876 F N1 N2 1.48656 R6 -0.6219 F N3 1.69100 R7 +0.6219 F N4 N5 1.58144 R8 -0.2989 F R9 -0.6186 F Nu 1 Nu 2 84.47 R10 -0.8964 F Nu 3 54.71 Nu 4 Nu 5 40.85 S1 S2 0.00299 F S4 0.07186 F wherein a positive radius indicates a convex surface and a negative radius indicates a concave surface.

Claim 23

An optical lens system, comprising in combination, first, second and third lens means; said first lens means having first through fourth elements arranged in sequence, said first element being double convex having radii of R1 and R2, said second element being a positive meniscus having radii of R3 and R4 and being spaced from said first element by an amount S1, said third element being a positive meniscus element having radii of R5 and R6 and being spaced from said second element by an amount S2, said fourth element being a negative meniscus having radii of R7 and R8 and in contact with said third element, said second lens means having a double concave element with radii of R9 and R10, an axial thickness t5, an index of refraction N5 and an Abbe number Nu 5, said third lens means being substantially identical to said first lens means, means establishing said first and third lens means substantially symmetrically spaced about said second lens means at a spacing of S4 with said fourth elements of said first and third lens means adjacent to said second lens means, said first through fourth elements having axial thicknesses t1-t4, indices of refraction N1-N4 and Abbe numbers Nu 1 - Nu 4, respectively, the optical lens system having an effective focal length of F and and said radii, said thicknesses, said indexes of refraction and said Abbe numbers being substantially: R1 +1.2173 F t1 t2 t4 0.02994 F R2 +2.5432 F t3 0.07985 F R3 +0.6492 F t5 0.03176 F R4 -3.9927 F R5 +0.3876 F N1 N2 1.48656 R6 -0.6219 F N3 1.69100 R7 +0.6219 F N4 N5 1.58144 R8 -0.2989 F R9 -0.6186 F Nu 1 Nu 2 84.47 R10 -0.8964 F Nu 3 54.71 Nu 4 Nu 5 40.85 S1 S2 0.00299 F S4 0.07186 F wherein a positive radius indicates a convex surface and a negative radius indicates a concave surface.