US4973995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera system and attachment lens with integral lens sections
Assignee: Canon Inc
•
Filing: 1989-09-05
•
Granted: 1990-11-27
•
Expires: 2009-09-05
Abstract
Abstract An attachment lens and a camera system, comprising an attachment lens adapted to be attached to the subject side of a camera which is equipped with separate optical openings for the photography system, the finder system, the photometry system, and the colorimetry system. The attachment lens includes an optical element which is on the camera side and which is equipped with a plurality of integrally formed sections facing the optical openings of the camera and having different refractive power configurations, thereby allowing the optical systems to be arranged close to each other.
Inventors
- 👤 Masatake Kato
- 👤 Shohei Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:07
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B13/00; G03B13/02; G03B13/10; G03B13/12; G03B7/00; G03B7/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A camera system comprising: a camera body including a subject side and at least first and second optical openings; and an attachment lens unit mean having at least first and second built-in lens units that is adapted to be detachably attached to the subject side of said camera body; said first lens unit having a predetermined refractive power, said second lens unit being opposed to said at least first and second optical openings and having a plurality of sections which respectively face each of said optical openings at certain positions, wherein each of said sections has a predetermined different configuration in accordance with the position at which each section faces one of said optical openings.
Claim 2
Dependent Claim
115 words
A camera system comprising: a camera body including a subject side and at least first and second optical openings; and an attachment lens unit mean having at least first and second built-in lens units that is adapted to be detachably attached to the subject side of said camera body; said first lens unit having a predetermined refractive power, said second lens unit being opposed to said at least first and second optical openings and having a plurality of sections which respectively face each of said optical openings at certain positions, wherein each of said sections has a predetermined different configuration in accordance with the position at which each section faces one of said optical openings.
Claim 3
Dependent Claim
30 words
A camera system according to claim 1, wherein the predetermined different configurations of the sections are determined such that each of said plurality of sections exhibits a different refractive power.
Claim 4
Dependent Claim
35 words
A camera system according to claim 1, wherein said first lens unit is positioned on the subject side of said second lens unit in such a manner as to cover all of said optical openings.
Claim 5
Dependent Claim
33 words
A camera system according to claim 1, wherein said first optical opening is an opening for a photography lens system, and wherein said second optical opening is an opening for a colorimetry system.
Claim 6
Dependent Claim
37 words
A camera system according to claim 1, wherein said first optical opening is an opening for a photography lens system and wherein said second optical opening is an opening for a finder system within said camera body.
Claim 7
Dependent Claim
36 words
A camera system according to claim 4, wherein said camera body is further equipped with a third optical opening for a photometry system and a fourth optical opening for a finder system within said camera body.
Claim 8
Dependent Claim
26 words
A camera system according to claim 1, wherein said second lens unit includes a section having positive refractive power and a section having negative refractive power.
Claim 9
Dependent Claim
16 words
A camera system according to claim 7, wherein said first lens unit has positive refractive power.
Claim 10
Dependent Claim
92 words
An attachment lens adapted to be detachably attached to a subject side of a camera body that is equipped with at least first and second optical openings, comprising: a first lens unit having a predetermined refractive power; and a second lens unit that is arranged on the camera body side of said first lens unit and including a plurality of integrally formed sections which have different refractive powers and are arranged in such a manner as to respectively face said optical openings when the attachment lens is attached to said camera body.
Claim 11
Dependent Claim
92 words
An attachment lens adapted to be detachably attached to a subject side of a camera body that is equipped with at least first and second optical openings, comprising: a first lens unit having a predetermined refractive power; and a second lens unit that is arranged on the camera body side of said first lens unit and including a plurality of integrally formed sections which have different refractive powers and are arranged in such a manner as to respectively face said optical openings when the attachment lens is attached to said camera body.
Claim 12
Dependent Claim
96 words
An attachment lens according to claim 9, wherein said first optical opening is an opening for a photography lens system, said second opening being an opening for a photometry system, wherein a camera body for use with the attachment lens further includes a third optical opening for a colorimetry system and a fourth optical opening for a finder system, and the second lens unit of said attachment lens further includes sections having different refractive powers and each section is arranged at a position that will be opposed to the four optical openings of said camera body.
Claim 13
Dependent Claim
16 words
An attachment lens according to claim 9, wherein said first lens unit has positive refractive power.
References Cited (Backward Citations)
US2730024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |