US3864713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal plane shutter blade support device
Assignee: Seiko Koki KK
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Filing: 1973-05-08
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Granted: 1975-02-04
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Expires: 1993-05-08
Abstract
Abstract A focal plane shutter blade arrangement in which two separate groups of shutter blades are independently mounted and operated in parallel relationships for opening and closing the shutter aperture. Each of the two shutter blade groups has a parallel link mechanism including shutter blades of the respective groups for operating the shutter blades. Each shutter blade group has a slit-forming shutter blade. One of these slit-forming blades has a straight trailing edge and the other a straight leading edge for forming an accurate slit uniformly as the shutter aperture is opened and closed. A baseboard pivotally supporting the two parallel link mechanisms and shutter blades has a single arcuate slot in which pins mounted on slit-forming blades and the parallel links are guided for maintaining the slit-forming blades accurately during travel to maintain their respective straight edges defining uniformly varying slits as the shutter aperture is opened and closed.
Inventors
- 👤 Kiyoshi Kitai
- 👤 Eiichi Onda
- 👤 Mitsuo Koyama
- 👤 Tadashi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
286 words
In a focal plane shutter, support means having a shutter aperture, a first plurality of shutter-opening blades closing the shutter when in a cocked condition, a first parallel link mechanism comprising two parallel link mechanism comprising two parallel links and said shutter-opening blades for supporting and operating the blades from a shutter-closing position to a shutter-opening position, a second plurality of shutter-closing blades disposed in a superposed relationship clear of said exposure aperture when said cocked condition exists and operable to a shutter-closing position closing the shutter aperture, a second parallel link mechanism comprising two parallel links and said shutter-closing blades for supporting and operating the shutter-closing blades, each of the first plurality of shutteropening blades and said second plurality of shutter-closing blades having a slit-defining shutter blade having a straight edge for defining a slit of varying width as the shutter aperture is opened, and closed, each link mechanism comprising a rotationally driven main link and an auxiliary link parallel with a portion of said main link, each link mechanism haing a plate pivotally supporting the auxiliary link on a respective main link, each said plate mounting the slit-defining blade of its corresponding plurality of shutter blades on a corresponding auxiliary link, pivOt means rotatably supporting the main link only of each link mechanism independently on said support means on a common side of said shutter aperture, a guide on each of the parallel links of each link mechanism for maintaining each respective straight edge of a corresponding slit-defining shutter blades in a plane normal to a medial plane passing through said aperture, and an arcuate slot on said support means within which said guide means are guided during travel of the slit-forming shutter blades.
Claim 2
Dependent Claim
286 words
In a focal plane shutter, support means having a shutter aperture, a first plurality of shutter-opening blades closing the shutter when in a cocked condition, a first parallel link mechanism comprising two parallel link mechanism comprising two parallel links and said shutter-opening blades for supporting and operating the blades from a shutter-closing position to a shutter-opening position, a second plurality of shutter-closing blades disposed in a superposed relationship clear of said exposure aperture when said cocked condition exists and operable to a shutter-closing position closing the shutter aperture, a second parallel link mechanism comprising two parallel links and said shutter-closing blades for supporting and operating the shutter-closing blades, each of the first plurality of shutteropening blades and said second plurality of shutter-closing blades having a slit-defining shutter blade having a straight edge for defining a slit of varying width as the shutter aperture is opened, and closed, each link mechanism comprising a rotationally driven main link and an auxiliary link parallel with a portion of said main link, each link mechanism haing a plate pivotally supporting the auxiliary link on a respective main link, each said plate mounting the slit-defining blade of its corresponding plurality of shutter blades on a corresponding auxiliary link, pivOt means rotatably supporting the main link only of each link mechanism independently on said support means on a common side of said shutter aperture, a guide on each of the parallel links of each link mechanism for maintaining each respective straight edge of a corresponding slit-defining shutter blades in a plane normal to a medial plane passing through said aperture, and an arcuate slot on said support means within which said guide means are guided during travel of the slit-forming shutter blades.
Claim 3
Dependent Claim
33 words
In a focal plane shutter according to claim 1, in which the slit-forming shutter blade of each group of shutter blades is longer than the remainder of the blades within its respective groups.
Claim 4
Dependent Claim
17 words
In a focal plane shutter according to claim 1, in which the shutter blades are substantially rectangular.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |