US4070098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fisheye projection lens system for 35mm motion pictures
Assignee: University of Arizona Foundation
•
Filing: 1976-04-28
•
Granted: 1978-01-24
•
Expires: 1996-04-28
Abstract
Abstract A 180 DEG high resolution fisheye projection lens suitable for projecting images onto a hemispherical dome, such as a planetarium dome, includes a nine-element projection lens and a six-element relay lens. The relay lens serves to increase the distance between the film plane and the lens and eliminates the need for modifying the projector to provide clearance between the lens and the projector shutter mechanism. In addition, the relay lens may be modified to make the fisheye lens compatible with various film sizes without modifying the fisheye lens. A focused iris is used to mask portions of the projected image, and a nonuniformly acting fader is used to reduce back scatter and to stop down the lens to adjust the brightness of the projected image.
Inventors
- 👤 Richard A. Buchroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:06
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
260 words
A fisheye lens system having the design parameters, normalized for an 8mm focal length, F 8 , represented in the following table: ______________________________________
ELE- THICK- SEPAR-
MENT n.sub.d
ν RADIUS NESS ATION
______________________________________
I 1.607 56.7 R.sub.1 = 8.853
t.sub.1 = .220
S.sub.1 = 1.037
R.sub.2 = 1.181
II 1.607 56.7 R.sub.3 = 4.463
t.sub.2 = .150
S.sub.2 = 1.486
R.sub.4 = 1.181
III 1.620 36.4 R.sub.5 = 5.798
t.sub.3 = .300
S.sub.3 = 1.062
R.sub.6 = 3.308
IV 1.620 36.4 R.sub.7 = 6.869
t.sub.4 = .150
S.sub.4 = .100
R.sub.8 = 2.536
V 1.607 56.7 R.sub.9 = 2.018
t.sub.5 = .500
S.sub.5 = .100
R.sub.10 = 2.638
VI 1.607 56.7 R.sub.11 = 6.440
t.sub.6 = .550
S.sub.6 = .100
R.sub.12 = 1.309
VII 1.755 27.6 R.sub.13 = 1.113
t.sub.7 = .150
R.sub.14 = 4.728
______________________________________ wherein the Roman numerals I-VII identify the respective lens element from the long conjugate side to the short conjugate side, n d is the refractive index; ν d is the dispersion number, R 1 -R 14 represent the radii of successive surfaces from the long conjugate side to the short conjugate side, and t 1 -t 7 and S 1 -S 6 represent the thicknesses of lens element and air spaces, respectively, from the long conjugate side to the short conjugate side, with all dimensions being expressed in inches, and wherein the design parameters may be renormalized to any other focal length, F n , by multiplying each of the surface radii, thicknesses and air spaces by the ratio F n /F 8 .
Claim 2
Dependent Claim
260 words
A fisheye lens system having the design parameters, normalized for an 8mm focal length, F 8 , represented in the following table: ______________________________________
ELE- THICK- SEPAR-
MENT n.sub.d
ν RADIUS NESS ATION
______________________________________
I 1.607 56.7 R.sub.1 = 8.853
t.sub.1 = .220
S.sub.1 = 1.037
R.sub.2 = 1.181
II 1.607 56.7 R.sub.3 = 4.463
t.sub.2 = .150
S.sub.2 = 1.486
R.sub.4 = 1.181
III 1.620 36.4 R.sub.5 = 5.798
t.sub.3 = .300
S.sub.3 = 1.062
R.sub.6 = 3.308
IV 1.620 36.4 R.sub.7 = 6.869
t.sub.4 = .150
S.sub.4 = .100
R.sub.8 = 2.536
V 1.607 56.7 R.sub.9 = 2.018
t.sub.5 = .500
S.sub.5 = .100
R.sub.10 = 2.638
VI 1.607 56.7 R.sub.11 = 6.440
t.sub.6 = .550
S.sub.6 = .100
R.sub.12 = 1.309
VII 1.755 27.6 R.sub.13 = 1.113
t.sub.7 = .150
R.sub.14 = 4.728
______________________________________ wherein the Roman numerals I-VII identify the respective lens element from the long conjugate side to the short conjugate side, n d is the refractive index; ν d is the dispersion number, R 1 -R 14 represent the radii of successive surfaces from the long conjugate side to the short conjugate side, and t 1 -t 7 and S 1 -S 6 represent the thicknesses of lens element and air spaces, respectively, from the long conjugate side to the short conjugate side, with all dimensions being expressed in inches, and wherein the design parameters may be renormalized to any other focal length, F n , by multiplying each of the surface radii, thicknesses and air spaces by the ratio F n /F 8 .
Claim 3
Dependent Claim
177 words
A fisheye lens system as recited in claim 1 further including lens elements having the design parameters represented in the following table: ______________________________________
Element
n.sub.d
ν Radius Thickness
Separation
______________________________________
VIII 1.607 56.7 R.sub.15 = PLANO
t.sub.8 = .750
S.sub.7 = 2.409
R.sub.16 = 5.002
K = - 7.32
IX 1.620 36.4 R.sub.17 = 5.002
t.sub.9 = .750
S.sub.8 = 1.253
R.sub.18 = PLANO
______________________________________ wherein VII-IX identify two additional lens elements added in sequence from the long conjugate side to the short conjugate side, R 15 -R 18 represent the radii of successive surfaces of the additional lens elements from the long conjugate side to the short conjugate side, t 8 -t 9 and S 7 -S 8 represent the thicknesses of the additional lens elements and air spaces, respectively from the long conjugate side to the short conjugate side, and K represents the asphericity constant with which the surface shape is defined by the equation ##EQU2## where R = radius of curvature Y = zonal radius of the surface Z = axial departure from flatness
Claim 4
Dependent Claim
20 words
A fisheye lens system as recited in claim 2 further including a focused iris disposed between elements VIII and IX.
Claim 5
Dependent Claim
206 words
A fisheye lens system as recited in claim 2 further including lens elements having the design parameters represented in the following table: ______________________________________
Element
n.sub.d
ν Radius Thickness
Separation
______________________________________
X 1.607 56.7 R.sub.19 = 2.127
t.sub.10 = .6450
S.sub.9 = 20.087
R.sub.20 = 35.712 NOM-
INAL
XI 1.607 56.7 R.sub.21 = 1.909
t.sub.11 = .6648
S.sub.10 = .008
R.sub.22 = 4.288
XII 1.755 27.6 R.sub.23 = 13.018
t.sub.12 = .1400
S.sub.11 = .140
R.sub.24 = 1.212
XIII 1.620 36.4 R.sub.25 = 1.212
t.sub.13 = .1400
S.sub.12 = 1.066
R.sub.26 = 2.071
XIV 1.607 56.7 R.sub.27 = 4.809
t.sub.14 = .6066
S.sub.13 = .070
R.sub.28 = 1.997
XV 1.607 56.7 R.sub.29 = 5.718
t.sub.15 = .5450
S.sub.14 = .144
R.sub.30 = 5.718
______________________________________ wherein X-XV identify six additional respective lens elements forming a relay lens system added in sequence from the long conjugate side to the short conjugate side, R 19 -R 30 represent the radii of successive surfaces of the additional lens elements from the long conjugate side to the short conjugate side, and t 10 -t 15 and S 9 -S 14 represent the thicknesses of the additional lens elements and air spaces, respectively, from the long conjugate side to the short conjugate side.
Claim 6
Dependent Claim
22 words
A fisheye lens system as recited in claim 4 further including a pivotably mounted fader leaf disposed between elements IX and X.
Claim 7
Dependent Claim
51 words
A fisheye lens system as recited in claim 5 wherein said fader leaf is movable over a limited range of rotation from a first position substantially parallel to the longitudinal axis of the lens system to a second position substantially at a 45° angle to the longitudinal axis of the lens.
Claim 8
Dependent Claim
26 words
A fisheye lens system as recited in claim 4 further including means for supporting said lens system at an angle displaced approximately 20° from the vertical.
Claim 9
Dependent Claim
16 words
A fisheye lens system as recited in claim 7 wherein said supporting means includes a projector.
Claim 10
Dependent Claim
33 words
A fisheye lens system as recited in claim 8 wherein said projector includes means for positioning a circular image having a diameter of approximately 23mm in a focal plane adjacent the element XV.
Claim 11
Dependent Claim
18 words
A fisheye lens system as recited in claim 9 wherein said projector is a 35mm motion picture projector.
References Cited (Backward Citations)
US3366436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |