US4792822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera with changeable focal length
Assignee: Fujifilm Holdings Corp
•
Filing: 1987-12-15
•
Granted: 1988-12-20
•
Expires: 2007-12-15
Abstract
Abstract An automatic focusing camera which is equipped with a taking lens system changeable in focal length between at least two different focal lengths: a relatively short focal length suitable for wide-angle photography, and a relatively long focal length suitable for telephotography. When the taking lens system is changed to have the relatively short focal length, the taking lens is further changed to be able to take close-up photographs and the automatic focusing is simultaneously changed to cover a short subject distance range between, for example 0.1 and 1.0 m.
Inventors
- 👤 Kazuhiro Akiyama
- 👤 Takao Koda
- 👤 Masao Shoji
- 👤 Toshio Yodhida
- 👤 Masayoshi Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:28
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/30; G03; G03B; G03B3/00; G03B3/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
175 words
A camera having an automatic focusing device which has a taking lens system changeable in focal length between at least first and second focal lengths and which allows close-up photography when said taking lens system is changed to have said second focal length, said camera comprising: movable means by which at least a part of said taking lens system is supported for axial movement; mechanical shifting means actuated by an electric motor for axially moving said movable member to change said taking lens system so as to have said first or said second focal length; means allowing said electric motor to rotate excessively after said axial movement of said movable member to change said taking lens system so as to have said second focal length, thereby moving axially said part of said taking lens system so as to change said taking lens system suitable for close-up photography; and focusing range changing means that coact with said means for changing a focusing range of said automatic focusing device to a range suitable for said close-up photography.
Claim 2
Dependent Claim
175 words
A camera having an automatic focusing device which has a taking lens system changeable in focal length between at least first and second focal lengths and which allows close-up photography when said taking lens system is changed to have said second focal length, said camera comprising: movable means by which at least a part of said taking lens system is supported for axial movement; mechanical shifting means actuated by an electric motor for axially moving said movable member to change said taking lens system so as to have said first or said second focal length; means allowing said electric motor to rotate excessively after said axial movement of said movable member to change said taking lens system so as to have said second focal length, thereby moving axially said part of said taking lens system so as to change said taking lens system suitable for close-up photography; and focusing range changing means that coact with said means for changing a focusing range of said automatic focusing device to a range suitable for said close-up photography.
Claim 3
Dependent Claim
27 words
A camera as defined in claim 1, wherein said movable means is supported by a movable lens barrel for axial movement relative to said movable lens barrel.
Claim 4
Dependent Claim
57 words
A camera as defined in claim 2, wherein said taking lens system includes a conversion lens supported by said movable lens barrel, ane means for removing said conversion lens from said taking lens system upon said axial movement of said movable lens barrel to change said taking lens system so as to have said first focal length.
Claim 5
Dependent Claim
45 words
A camera as defined in claim 1, wherein said automatic focusing device has light projecting means and light receiving means, said light projecting means including a light projecting lens which is shiftable toward said light receiving means by said excessive rotation of said electric motor.
References Cited (Backward Citations)
US4367934A
Cited
US4536068A
Cited
US4627699A
Cited
US4688919A
Cited
US4582411A
Cited
US4643555A
Cited
US4696559A
Cited
US4660954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |