Patent US4601548A successfully refreshed from Google Patents.
US4601548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microlens
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1983-10-28
•
Granted: 1986-07-22
•
Expires: 2003-10-28
Abstract
Abstract A microlens for use with an optical fiber or the like. It comprises a single lens having a diameter of about 0.5 mm. It provides an ideal combination of the length of the lens with the refractive index of its opposite surfaces for a minimum curvature of field.
Inventors
- 👤 Mitsuru Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:39
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/02; G02B3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A microlens for forming in the air the image of an object present in the air, said microlens comprising a single lens having a diameter of not more than 0.58 mm and made of a material having a refractive index of 1.75 to 1.85 both inclusive, said microlens meeting the following conditions: 0.58≦r 1 ≦0.60 (mm) 0.42≦r 2 ≦0.44 (mm) 0.45≦l≦0.55 (mm) wherein r 1 is the radius of curvature of one of the opposite surfaces of said microlens facing the object, r 2 being the radius of curvature of the other of its opposite surfaces on the side where an image is formed, and l being the axial length of said microlens.
Claim 2
Dependent Claim
113 words
A microlens for forming in the air the image of an object present in the air, said microlens comprising a single lens having a diameter of not more than 0.58 mm and made of a material having a refractive index of 1.75 to 1.85 both inclusive, said microlens meeting the following conditions: 0.58≦r 1 ≦0.60 (mm) 0.42≦r 2 ≦0.44 (mm) 0.45≦l≦0.55 (mm) wherein r 1 is the radius of curvature of one of the opposite surfaces of said microlens facing the object, r 2 being the radius of curvature of the other of its opposite surfaces on the side where an image is formed, and l being the axial length of said microlens.
Claim 3
Dependent Claim
62 words
A microlens for forming in the air the image of an object present in the water, said microlens comprising a single lens having a diameter of not more than 0.58 mm and made of a material having a refractive index of 1.75 to 1.85 both inclusive, said microlens meeting the following conditions: 0.29≦r 1 ≦0.31 (mm) 0.37≦r 2 ≦0.39 (mm) 0.52≦l≦0.62 (mm)
Claim 4
Dependent Claim
62 words
A microlens for forming in the air the image of an object present in the water, said microlens comprising a single lens having a diameter of not more than 0.58 mm and made of a material having a refractive index of 1.75 to 1.85 both inclusive, said microlens meeting the following conditions: 0.29≦r 1 ≦0.31 (mm) 0.37≦r 2 ≦0.39 (mm) 0.52≦l≦0.62 (mm)
References Cited (Backward Citations)
US3656832A
Cited
US4354734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |