Patent US3884556A successfully refreshed from Google Patents.
US3884556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrofocus wide-angle lens system
Assignee: Olympus Corp
•
Filing: 1973-05-04
•
Granted: 1975-05-20
•
Expires: 1993-05-04
Abstract
Abstract A compact retrofocus wide-angle lens systems for which aberrations are corrected favourably by using a positive meniscus lens with a large power as the first lens, negative meniscus lenses as second and third lenses and a thick positive lens as a fourth lens.
Inventors
- 👤 Jihei Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:53
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
159 words
A retrofocus wide-angle lens system consisting of a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component means having a positive refractive power, a fifth lens component means having a negative refractive power, a sixth lens component being a positive lens, and said retrofocus wide-angle lens system satisfying the following conditions: 0.4f < f123 < 0.8f, f123 < 0 0.5f < D4 + D5 < f where reference symbol f represents the total focal length of the lens system as a whole, reference symbol f123 represents the total focal length of said first, second and third lens components, reference symbol D4 represents the distance from the front surface to the rear surface of said fourth lens component means and reference symbol D5 represents the distance from the front surface to rear surface of said fifth lens component means.
Claim 2
Dependent Claim
159 words
A retrofocus wide-angle lens system consisting of a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component means having a positive refractive power, a fifth lens component means having a negative refractive power, a sixth lens component being a positive lens, and said retrofocus wide-angle lens system satisfying the following conditions: 0.4f < f123 < 0.8f, f123 < 0 0.5f < D4 + D5 < f where reference symbol f represents the total focal length of the lens system as a whole, reference symbol f123 represents the total focal length of said first, second and third lens components, reference symbol D4 represents the distance from the front surface to the rear surface of said fourth lens component means and reference symbol D5 represents the distance from the front surface to rear surface of said fifth lens component means.
Claim 3
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, a sixth lens component being a positive single lens, and said retrofocus wide-angle lens system having the following numerical data:
Claim 4
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, a sixth lens component being a positive single lens, and said retrofocus wide-angle lens system having the following numerical data:
Claim 5
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, a sixth lens component being a positive single lens, and said retrofocus wide-angle lens sysTem having the following numerical data:
Claim 6
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, a sixth lens component being a positive single lens, and said retrofocus wide-angle lens sysTem having the following numerical data:
Claim 7
Dependent Claim
69 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a negative lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 8
Dependent Claim
69 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a negative lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 9
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 10
Dependent Claim
71 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 11
Dependent Claim
72 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive meniscus lens, a fifth lens component being a cemented negative doublet lens, and sixth aNd seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 12
Dependent Claim
72 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a positive meniscus lens, a fifth lens component being a cemented negative doublet lens, and sixth aNd seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 13
Dependent Claim
73 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a cemented positive doublet lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens systems having the following numerical data:
Claim 14
Dependent Claim
73 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a cemented positive doublet lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens systems having the following numerical data:
Claim 15
Dependent Claim
73 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a cemented positive triplet lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 16
Dependent Claim
73 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a cemented positive triplet lens, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 17
Dependent Claim
85 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a combined lens comprising a positive doublet lens and a positive lens arranged leaving a small airspace, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 18
Dependent Claim
85 words
A retrofocus wide-angle lens system comprising a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, a fourth lens component being a combined lens comprising a positive doublet lens and a positive lens arranged leaving a small airspace, a fifth lens component being a cemented negative doublet lens, and sixth and seventh lens components being positive lenses, and said retrofocus wide-angle lens system having the following numerical data:
Claim 19
Dependent Claim
167 words
A retrofocus wide-angle lens system consisting of a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, fourth lens component means having a positive refractive power, fifth lens component means Having a negative refractive power, a sixth lens component being a positive lens, and a seventh lens component being a positive lens, and said retrofocus wide-angle lens system satisfying the following conditions: 0.64f < f123 < 0.72f, f123 < 0 0.65f < D4 + D5 < 0.84f where reference symbol f represents the total focal length of the lens system as a whole, reference symbol f123 represents the total focal length of said first, second and third lens components, reference symbol D4 represents the distance from the front surface to the rear surface of said fourth lens component means and reference symbol D5 represents the distance from the front surface to the rear surface of said fifth lens component means.
Claim 20
Dependent Claim
167 words
A retrofocus wide-angle lens system consisting of a first lens component being a positive meniscus lens, a second lens component being a negative meniscus lens, a third lens component being a negative meniscus lens, fourth lens component means having a positive refractive power, fifth lens component means Having a negative refractive power, a sixth lens component being a positive lens, and a seventh lens component being a positive lens, and said retrofocus wide-angle lens system satisfying the following conditions: 0.64f < f123 < 0.72f, f123 < 0 0.65f < D4 + D5 < 0.84f where reference symbol f represents the total focal length of the lens system as a whole, reference symbol f123 represents the total focal length of said first, second and third lens components, reference symbol D4 represents the distance from the front surface to the rear surface of said fourth lens component means and reference symbol D5 represents the distance from the front surface to the rear surface of said fifth lens component means.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |