Patent US4416519A successfully refreshed from Google Patents.
US4416519A
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Objective for video disks
Assignee: Olympus Corp
•
Filing: 1981-08-21
•
Granted: 1983-11-22
•
Expires: 2001-08-21
Abstract
Abstract An objective for video disks comprising a first, second and third lenses in which the first lens is a positive lens, the second lens is a negative lens and the third lens is a positive meniscus lens having a concave surface on the video disk side. This objective is small, light in the weight and has a large N.A.
Inventors
- 👤 Yuko Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:16
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12; G02B13/00; G02B13/24; G02B9/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
294 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5700
d.sub.1 = 0.3355
n.sub.1 = 1.69981
ν.sub.1 = 29.51
r.sub.2 = -4.5434
d.sub.2 = 0.0530
r.sub.3 = -2.8939
d.sub.3 = 0.1395
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = -28.7100
d.sub.4 = 0.0698
r.sub.5 = 0.6472
d.sub.5 = 0.3070
n.sub.3 = 1.76300
ν.sub.3 = 25.68
r.sub.6 = 1.2643
f = 1
t = 0.3349
##STR8##
D (= d.sub.1 + d.sub.2 + d.sub.3 + d.sub.4 + d.sub.5) = 0.905
s = 0.48
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 2
Dependent Claim
294 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5700
d.sub.1 = 0.3355
n.sub.1 = 1.69981
ν.sub.1 = 29.51
r.sub.2 = -4.5434
d.sub.2 = 0.0530
r.sub.3 = -2.8939
d.sub.3 = 0.1395
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = -28.7100
d.sub.4 = 0.0698
r.sub.5 = 0.6472
d.sub.5 = 0.3070
n.sub.3 = 1.76300
ν.sub.3 = 25.68
r.sub.6 = 1.2643
f = 1
t = 0.3349
##STR8##
D (= d.sub.1 + d.sub.2 + d.sub.3 + d.sub.4 + d.sub.5) = 0.905
s = 0.48
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 3
Dependent Claim
283 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5769
d.sub.1 = 0.3353
n.sub.1 = 1.69981
ν.sub.1 = 29.51
r.sub.2 = -4.5846
d.sub.2 = 0.0530
r.sub.3 = -2.8770
d.sub.3 = 0.1395
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = -33.3617
d.sub.4 = 0.1675
r.sub.5 = 0.6308
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.2879
f = 1
t = 0.3349
##STR9##
D = 1.002
s = 0.44
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 4
Dependent Claim
283 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5769
d.sub.1 = 0.3353
n.sub.1 = 1.69981
ν.sub.1 = 29.51
r.sub.2 = -4.5846
d.sub.2 = 0.0530
r.sub.3 = -2.8770
d.sub.3 = 0.1395
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = -33.3617
d.sub.4 = 0.1675
r.sub.5 = 0.6308
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.2879
f = 1
t = 0.3349
##STR9##
D = 1.002
s = 0.44
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 5
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.3601
d.sub.1 = 0.4177
n.sub.1 = 1.6728
ν.sub.1 = 31.08
r.sub.2 = -4.5817
d.sub.2 = 0.053
r.sub.3 = -2.8417
d.sub.3 = 0.1954
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 43.4851
d.sub.4 = 0.1675
r.sub.5 = 0.6087
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.2493
f = 1
t = 0.3349
##STR10##
D = 1.14
s = 0.39
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 throudh d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 6
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.3601
d.sub.1 = 0.4177
n.sub.1 = 1.6728
ν.sub.1 = 31.08
r.sub.2 = -4.5817
d.sub.2 = 0.053
r.sub.3 = -2.8417
d.sub.3 = 0.1954
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 43.4851
d.sub.4 = 0.1675
r.sub.5 = 0.6087
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.2493
f = 1
t = 0.3349
##STR10##
D = 1.14
s = 0.39
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 throudh d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 7
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.4005
d.sub.1 = 0.4186
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = ∞
d.sub.2 = 0.0698
r.sub.3 = -2.6447
d.sub.3 = 0.1954
n.sub.2 = 1.52331
ν.sub.2 = 48.90
r.sub.4 = ∞
d.sub.4 = 0.1786
r.sub.5 = 0.7064
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 2.5599
f = 1
t = 0.4186
##STR11##
D = 1.169
s = 0.43
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 8
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.4005
d.sub.1 = 0.4186
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = ∞
d.sub.2 = 0.0698
r.sub.3 = -2.6447
d.sub.3 = 0.1954
n.sub.2 = 1.52331
ν.sub.2 = 48.90
r.sub.4 = ∞
d.sub.4 = 0.1786
r.sub.5 = 0.7064
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 2.5599
f = 1
t = 0.4186
##STR11##
D = 1.169
s = 0.43
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 9
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.4177
d.sub.1 = 0.4996
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -6.3926
d.sub.2 = 0.0636
r.sub.3 = -2.9891
d.sub.3 = 0.2344
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 7.7025
d.sub.4 = 0.2009
r.sub.5 = 0.6097
d.sub.5 = 0.3684
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.5251
f = 1
t = 0.3349
##STR12##
D = 1.37
s = 0.39
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 and d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 10
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.4177
d.sub.1 = 0.4996
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -6.3926
d.sub.2 = 0.0636
r.sub.3 = -2.9891
d.sub.3 = 0.2344
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 7.7025
d.sub.4 = 0.2009
r.sub.5 = 0.6097
d.sub.5 = 0.3684
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.5251
f = 1
t = 0.3349
##STR12##
D = 1.37
s = 0.39
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 and d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 11
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.6389
d.sub.1 = 0.4189
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -4.6948
d.sub.2 = 0.0698
r.sub.3 = -2.1398
d.sub.3 = 0.1954
n.sub.2 = 1.52331
ν.sub.2 = 48.90
r.sub.4 = 6.7465
d.sub.4 = 0.1675
r.sub.5 = 0.6569
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 2.0347
f = 1
t = 0.3349
##STR13##
D = 1.16
s = 0.42
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers or respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 12
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.6389
d.sub.1 = 0.4189
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -4.6948
d.sub.2 = 0.0698
r.sub.3 = -2.1398
d.sub.3 = 0.1954
n.sub.2 = 1.52331
ν.sub.2 = 48.90
r.sub.4 = 6.7465
d.sub.4 = 0.1675
r.sub.5 = 0.6569
d.sub.5 = 0.307
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 2.0347
f = 1
t = 0.3349
##STR13##
D = 1.16
s = 0.42
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers or respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 13
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5597
d.sub.1 = 0.5994
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -9.8509
d.sub.2 = 0.0763
r.sub.3 = -3.0851
d.sub.3 = 0.2813
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 35.5353
d.sub.4 = 0.2411
r.sub.5 = 0.6066
d.sub.5 = 0.4421
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.6564
f = 1
t = 0.3349
##STR14##
D = 1.64
s = 0.24
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
Claim 14
Dependent Claim
284 words
An objective for video disks consisting of a first, second and third lenses, said first lens being a positive lens, said second lens being a negative lens, said third lens being a positive meniscus lens having a concave surface on the video disk side, said objective for video disks satisfying the following conditions: (1) 1.5<f 12 /f 3 <3.0 (2) 0.7f<D<1.65f wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f 12 represents the composite focal length of the first and second lenses, reference symbol f 3 represents the focal length of the third lens, and reference symbol D represents the overall length of the lens system, and in which said objective for video disks has the following numerical data: ______________________________________
r.sub.1 = 1.5597
d.sub.1 = 0.5994
n.sub.1 = 1.763
ν.sub.1 = 25.68
r.sub.2 = -9.8509
d.sub.2 = 0.0763
r.sub.3 = -3.0851
d.sub.3 = 0.2813
n.sub.2 = 1.74132
ν.sub.2 = 26.52
r.sub.4 = 35.5353
d.sub.4 = 0.2411
r.sub.5 = 0.6066
d.sub.5 = 0.4421
n.sub.3 = 1.763
ν.sub.3 = 25.68
r.sub.6 = 1.6564
f = 1
t = 0.3349
##STR14##
D = 1.64
s = 0.24
______________________________________ wherein reference symbols r 1 through r 6 respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 through d 5 respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 and n 3 respectively represent refractive indices of respective lenses at λ=830 nm, reference symbols ν 1 , ν 2 and ν 3 respectively represent Abbe's numbers of respective lenses for d-line, reference symbol t represents the thickness of cover glass, reference symbol s represents the working distance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |