Patent US5164757A successfully refreshed from Google Patents.
US5164757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens barrel and camera incorporating such barrel
Assignee: Pentax Corp
•
Filing: 1992-01-31
•
Granted: 1992-11-17
•
Expires: 2012-01-31
Abstract
Abstract The invention relates to an apparatus for a camera for selectively positioning a correcting optical element (61) used during macro-photography in front of the light receiver (72) of a distance measuring device. The camera has a generally cylindrical rotatable cam ring (22) as a part of its lens. The cam ring (22) has a plurality of threads (69) on an exterior cam ring surface, said threads (69) comprising means for selectively engaging said optical element (61) during rotation of said cam ring (22).
Inventors
- 👤 Hiroshi Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:03
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B7/102; G02B13/00; G02B13/001; G02B13/009; G02B15/00; G02B15/14; G02B15/142; G03; G03B; G03B17/00; G03B17/02; G03B17/04; G03B17/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
A mechanism for operating a close distance correcting optical element in a lens shutter type of zoom lens camera which has an optical axis and which includes a zoom lens for effecting macro photography, an object distance measuring device having a light emitter and a light receiver, and having an optical axis, for detecting an object distance, a close distance correcting optical element which can be retractably positioned in front of said light receiver, and a cam ring for moving said zoom lens between a normal photographing range and a macro-photographing range, said cam ring being connected to a stationary barrel via a helicoid positioned on said cam ring, said optical element being associated with said cam ring helicoid such that said mechanism comprises means for moving said close distance correcting optical element away from the optical axis of said light receiver when said zoom lens is located in said normal photographing range, and for bringing said close distance correcting optical element into the optical axis of said light receiver when said zoom lens is located in said macro photographic range.
Claim 2
Dependent Claim
181 words
A mechanism for operating a close distance correcting optical element in a lens shutter type of zoom lens camera which has an optical axis and which includes a zoom lens for effecting macro photography, an object distance measuring device having a light emitter and a light receiver, and having an optical axis, for detecting an object distance, a close distance correcting optical element which can be retractably positioned in front of said light receiver, and a cam ring for moving said zoom lens between a normal photographing range and a macro-photographing range, said cam ring being connected to a stationary barrel via a helicoid positioned on said cam ring, said optical element being associated with said cam ring helicoid such that said mechanism comprises means for moving said close distance correcting optical element away from the optical axis of said light receiver when said zoom lens is located in said normal photographing range, and for bringing said close distance correcting optical element into the optical axis of said light receiver when said zoom lens is located in said macro photographic range.
Claim 3
Dependent Claim
54 words
A mechanism in accordance with claim 1, further comprising a lens guide ring adapted to move along the optical axis of said camera together with said cam ring, said cam ring being rotatable with respect to said lens guide ring in association with axial movement of said cam ring and said lens guide ring.
Claim 4
Dependent Claim
41 words
A mechanism in accordance with claim 2, further comprising a light intercepting plate positioned on a rear end of said lens guide ring, said plate comprising means for preventing harmful light from reaching a film plane of said zoom lens camera.
Claim 5
Dependent Claim
59 words
A mechanism in accordance with claim 3, wherein said lens guide ring includes a linear movement guide plate which is adapted to be movably guided along said optical axis direction by an inner surface of said stationary barrel, wherein said light intercepting plate comprises an extension of said linear movement guide plate which extends towards said camera optical axis.
Claim 6
Dependent Claim
60 words
Apparatus for selectively positioning a correcting optical element used during macro-photography in front of a light receiver of a distance measuring device, said apparatus comprising a generally cylindrical cam ring, said cam ring having a plurality of threads on an exterior cam ring surface, said threads comprising means for selectively engaging said optical element during rotation of said cam ring.
Claim 7
Dependent Claim
60 words
Apparatus for selectively positioning a correcting optical element used during macro-photography in front of a light receiver of a distance measuring device, said apparatus comprising a generally cylindrical cam ring, said cam ring having a plurality of threads on an exterior cam ring surface, said threads comprising means for selectively engaging said optical element during rotation of said cam ring.
Claim 8
Dependent Claim
43 words
Apparatus in accordance with claim 5, wherein said optical element is naturally biased by a spring into a position in front of said light receiver, said optical element having a frame including a projection which is selectively engaged by said cam ring threads.
Claim 9
Dependent Claim
52 words
A device in accordance with claim 6, wherein said threads are adapted to engage said optical element projection, against the force exerted by said spring, when in a normal photographing position, thereby moving said optical element into a position away from said light receiver when said threads engage said optical element projection.
Claim 10
Dependent Claim
54 words
A device in accordance with claim 6, wherein said light receiver and said optical element are positioned in a recess on a stationary lens barrel, said recess having a lower opening through which said projection is adapted to extend, such that said projection will selectively engage said threads upon rotation of said cam ring.
References Cited (Backward Citations)
US3619202A
Cited
US4043642A
Cited
US4281907A
Cited
US4275952A
Cited
US4324457A
Cited
US4346967A
Cited
US4627691A
Cited
US4367934A
Cited
US4445756A
Cited
US4506959A
Cited
US4560237A
Cited
US4564264A
Cited
US4508443A
Cited
US4585313A
Cited
US4639083A
Cited
US4681406A
Cited
US4671622A
Cited
US4660954A
Cited
US4748466A
Cited
JPS62127513A
Cited
US4822153A
Cited
US5012273B1
Cited
US5012273A
Cited
WO1987007038A1
Cited
US4944030B1
Cited
US5016032A
Cited
US4944030A
Cited
JPS6326832A
Cited
JPS6380534A
Cited
JPS63148213A
Cited
US4848884A
Cited
US4833497A
Cited
US4911542A
Cited
JPS63271306A
Cited
US4864348A
Cited
US4974949A
Cited
US4974949B1
Cited
US4962399A
Cited
US5043752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |