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US4101196A
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Objective optical system for endoscopes
Assignee: Olympus Corp
•
Filing: 1976-08-23
•
Granted: 1978-07-18
•
Expires: 1996-08-23
Abstract
Abstract An objective optical system for endoscopes comprising a cylindrical light-focusing heterogeneous medium, for which refractive index distribution is expressed by the following formula and which is arranged on the object side of an image-transmitting optical fiber bundle.
Inventors
- 👤 Toshihiro Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:34
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/02; G02B13/00; G02B13/04; G02B23/00; G02B23/24; G02B23/2407; G02B23/2423; G02B23/243; G02B3/00; G02B3/0087; G02B6/00; G02B6/04; G02B6/06; G02B9/04; G02B9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
An objective optical system for endoscopes comprising an optical fiber bundle for transmitting an image of an object and a cylindrical light-focusing heterogeneous medium arranged near the end face of said optical fiber bundle on the object side and having refractive index distribution n given by the following formula: n = n.sub.0 (1 - 1/2 α R.sup.2) wherein reference symbol n 0 represents refractive index on the optical axis, reference symbol α represents the coefficient of refractive index distribution and reference symbol R represents the distance from the optical axis, said optical system further comprising a negative lens arranged on the object side of said light-focusing heterogeneous medium.
Claim 2
Dependent Claim
108 words
An objective optical system for endoscopes comprising an optical fiber bundle for transmitting an image of an object and a cylindrical light-focusing heterogeneous medium arranged near the end face of said optical fiber bundle on the object side and having refractive index distribution n given by the following formula: n = n.sub.0 (1 - 1/2 α R.sup.2) wherein reference symbol n 0 represents refractive index on the optical axis, reference symbol α represents the coefficient of refractive index distribution and reference symbol R represents the distance from the optical axis, said optical system further comprising a negative lens arranged on the object side of said light-focusing heterogeneous medium.
Claim 3
Dependent Claim
88 words
An objective optical system for endoscopes according to claim 1, in which said objective optical system for endoscopes has the following numerical values: ______________________________________
r.sub.1 =
∞
d.sub.1 = 0.37
n.sub.d = 1.51633
ν.sub.d = 64.1
r.sub.2 =
1.869
d.sub.2 = 0.2
r.sub.3 =
∞
d.sub.3 = 2.7
Light-focusing hete-
μ.sub.d = 22.8
rogeneous medium
r.sub.4 =
∞
______________________________________ wherein said light-focusing heterogeneous medium has the following numerical values. ______________________________________
##STR4##
n.sub.Od = 1.63 , αd = 0.338
f = 1 , β = 0.3 ,
##STR5##
______________________________________
Claim 4
Dependent Claim
87 words
An objective optical system for endoscopes according to claim 1, in which said objective optical system for endoscopes has the following numerical values: ______________________________________
r.sub.1 =
d.sub.1 = 0.37
n.sub.d = 1.69895
ν.sub.d = 30.12
r.sub.2 =
2.53
d.sub.2 = 0.2
r.sub.3 =
∞
d.sub.3 = 2.7
Light-focusing hete-
μ.sub.d = 60.6
rogeneous medium
r.sub.4 =
∞
______________________________________ wherein said light-focusing heterogeneous medium has the following numerical values. ______________________________________
##STR6##
n.sub.Od = 1.63 , αd = 0.338
f = 1 , β = 0.3 ,
##STR7##
______________________________________
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |