US4423470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens barrel suitable for flash photography
Assignee: Nikon Corp
•
Filing: 1981-08-26
•
Granted: 1983-12-27
•
Expires: 2001-08-26
Abstract
Abstract In a lens barrel to which a flashlight-emitting device is mounted or may be mounted and which enables a very proximate object to be photographed, there is provided a light-intercepting member interposed in the path of the light emitted by the flashlight-emitting device in response to the operation of a lens optical system for rendering the lens barrel capable of effecting very proximate photography, the light-intercepting member being for intercepting part of the light emitted from the flashlight-emitting device and travelling toward the optical axis of the lens optical system.
Inventors
- 👤 Hideshi Naito
- 👤 Hideyo Nozawa
- 👤 Kazuyuki Kazami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517; G03B2215/0539
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
In an apparatus including, in combination, a lens barrel having photographic lens means and a stop, and flashlight-emitting means which is mounted at an outer peripheral portion of said lens barrel and produces flashlight for illuminating a subject to be photographed, the improvement for very proximate photography in which the subject is positioned at a short film-to-subject distance and is illuminated by said flashlight to effect phototaking via said lens barrel, comprising: light-intercepting means for intercepting a part of the flashlight emitted from said flashlight-emitting means and directed to the optical axis of said lens means, the light-intercepting means being positioned so as to enlarge an area that provides little illumination by said flashlight of said subject to be photographed, the area being defined by both said lens barrel and the illumination pattern of said flashlight; said light-intercepting means being interposed in the path of the flashlight so that it is effective during said very proximate photography.
Claim 2
Dependent Claim
157 words
In an apparatus including, in combination, a lens barrel having photographic lens means and a stop, and flashlight-emitting means which is mounted at an outer peripheral portion of said lens barrel and produces flashlight for illuminating a subject to be photographed, the improvement for very proximate photography in which the subject is positioned at a short film-to-subject distance and is illuminated by said flashlight to effect phototaking via said lens barrel, comprising: light-intercepting means for intercepting a part of the flashlight emitted from said flashlight-emitting means and directed to the optical axis of said lens means, the light-intercepting means being positioned so as to enlarge an area that provides little illumination by said flashlight of said subject to be photographed, the area being defined by both said lens barrel and the illumination pattern of said flashlight; said light-intercepting means being interposed in the path of the flashlight so that it is effective during said very proximate photography.
Claim 3
Dependent Claim
53 words
The improvement according to claim 1, wherein said lens barrel has mounted thereon a close-up lens used in said very proximate photography, and said light-intercepting means is fixed to said close-up lens so that it is interposed in said path of the flashlight when the close-up lens is mounted on said lens barrel.
Claim 4
Dependent Claim
93 words
The improvement according to claim 1, wherein said lens barrel is further provided with focusing means capable of focusing relative to the film-to-subject distance at said very proximate photography and relative to film-to-subject distance at normal photography in which the film-to-subject distance is longer than said film-to-subject distance at very proximate photography, and wherein said light-intercepting means is constructed to advance in said path of the flashlight when focusing is effected at said very proximate photography and to retract from the path of said flashlight when focusing is effected at said normal photography.
Claim 5
Dependent Claim
72 words
The improvement according to claim 3, wherein cam means is provided between said focusing means and said light-intercepting means, and said cam means causes the amount of the advance of said light-intercepting means in the path of said flashlight to be adjustable in response to the displacement of said focusing means at said very proximate photography, so that the area that provides little illumination may be changed depending upon the film-to-subject distance.
Claim 6
Dependent Claim
21 words
The improvement according to claim 1, wherein said stop is set at a predetermined aperture appropriate to said very proximate photography.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |