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US4400065A
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Multi-purpose telescope
Assignee: Individual
•
Filing: 1981-05-18
•
Granted: 1983-08-23
•
Expires: 2001-05-18
Abstract
Abstract A multi-purpose telescope objective having a Petzval type lens configuration and including an iris diaphragm.
Inventors
- 👤 Albert Nagler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:09
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0025; G02B13/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A multi-purpose telescope comprising a Petzval type objective having a front achromat and a rear achromat widely spaced from each other, and an iris disphragm located between said achromats and proximate to said rear achromat, and wherein said Petzval type objective includes lens elements LI and LIII made of BK-7 glass having a refractive index of 1.5168 and an Abbe number of 64.2 and lens elements LII and LIV made of SF-12 glass having a refractive index of 1.6477 and an Abbe number of 33.8 and said lens elements have the parameters specified in the following table wherein all dimensions are given in millimeters: ______________________________________
Lens Lens Lens Clear
Ele- Thick- Separa-
Aper- Outside
ment Radii ness "d" tion "s"
ture Diameter
______________________________________
r1=+411.43
LI d1=16.0 126 132
r2=-544.15
s1=6.0
r3=-501.7
LII d2=12.0 126 132
r4=-6890.0
s2=480.0
r5=+253.263
LIII d3=8.0 60 64
r6=-253.263
s3=0.0
r6=-253.263
LIV d4=8.0 60 64
r7=-1386.0
______________________________________
Claim 2
Dependent Claim
151 words
A multi-purpose telescope comprising a Petzval type objective having a front achromat and a rear achromat widely spaced from each other, and an iris disphragm located between said achromats and proximate to said rear achromat, and wherein said Petzval type objective includes lens elements LI and LIII made of BK-7 glass having a refractive index of 1.5168 and an Abbe number of 64.2 and lens elements LII and LIV made of SF-12 glass having a refractive index of 1.6477 and an Abbe number of 33.8 and said lens elements have the parameters specified in the following table wherein all dimensions are given in millimeters: ______________________________________
Lens Lens Lens Clear
Ele- Thick- Separa-
Aper- Outside
ment Radii ness "d" tion "s"
ture Diameter
______________________________________
r1=+411.43
LI d1=16.0 126 132
r2=-544.15
s1=6.0
r3=-501.7
LII d2=12.0 126 132
r4=-6890.0
s2=480.0
r5=+253.263
LIII d3=8.0 60 64
r6=-253.263
s3=0.0
r6=-253.263
LIV d4=8.0 60 64
r7=-1386.0
______________________________________
Claim 3
Dependent Claim
125 words
A Petzval type objective including lens elements LI, LII, LIII, and LIV wherein lens elements LI and LIII are made of BK-7 glass having a refractive index of 1.5168 and an Abbe number of 64.2 and lens elements LII and LIV are made of SF-12 glass having a refractive index of 1.6477 and an Abbe number of 33.8, and wherein said lens elements have the parameters specified in the following table where all dimensions are given in millimeters: ______________________________________
Lens Lens Lens Clear
Ele- Thick- Separa-
Aper- Outside
ment Radii ness "d" tion "s"
ture Diameter
______________________________________
r1=+411.43
LI d1=16.0 126 132
r2=-544.15
s1=6.0
r3=-501.7
LII d2=12.0 126 132
r4=-6890.0
s2=480.0
r5=+253.263
LIII d3=8.0 60 64
r6=-253.263
s3=0.0
r6=-253.263
LIV d4=8.0 60 64
r7=-1386.0
______________________________________
Claim 4
Dependent Claim
125 words
A Petzval type objective including lens elements LI, LII, LIII, and LIV wherein lens elements LI and LIII are made of BK-7 glass having a refractive index of 1.5168 and an Abbe number of 64.2 and lens elements LII and LIV are made of SF-12 glass having a refractive index of 1.6477 and an Abbe number of 33.8, and wherein said lens elements have the parameters specified in the following table where all dimensions are given in millimeters: ______________________________________
Lens Lens Lens Clear
Ele- Thick- Separa-
Aper- Outside
ment Radii ness "d" tion "s"
ture Diameter
______________________________________
r1=+411.43
LI d1=16.0 126 132
r2=-544.15
s1=6.0
r3=-501.7
LII d2=12.0 126 132
r4=-6890.0
s2=480.0
r5=+253.263
LIII d3=8.0 60 64
r6=-253.263
s3=0.0
r6=-253.263
LIV d4=8.0 60 64
r7=-1386.0
______________________________________
Claim 5
Dependent Claim
30 words
A telescope comprising a Petzval type objective according to claim 2 an iris diaphragm located between lens elements LII and LIII and proximate to lens element LIII, and an eyepiece.
References Cited (Backward Citations)
GB209371A
Cited
US2500046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |