Patent US3834802A successfully refreshed from Google Patents.
US3834802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter blade operation mechanism for focal plane shutter
Assignee: Seiko Koki KK
•
Filing: 1973-05-14
•
Granted: 1974-09-10
•
Expires: 1993-05-14
Abstract
Abstract A focal plane shutter having a set or group of shutter-opening shutter blades and a set or group of shutter-closing shutter blades each consisting of a plurality of shutter blades for opening a shutter exposure aperture and closing it. Driving mechanism is provided for each group with a driving main lever supported on one side of the exposure aperture. A shutter blade operating auxiliary lever is supported on a corresponding one of the driving main levers and one end of this auxiliary lever is rotatably connected with a slit-forming shutter blade and a slot guides the travel of this end of the auxiliary lever to operate the slit-forming blade in parallel motion to define a uniform rectangular slit as the aperture is opened and closed.
Inventors
- 👤 M Koyama
- 👤 S Nagaoka
- 👤 K Kitai
- 👤 E Onda
- 👤 T Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:19
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
221 words
On a focal plane shutter, a first group or shutter-opening shutter blades, a second group of shutter-closing shutter blades, means defining a shutter aperture, a pair of paired levers for actuating the first and second group of shutter blades independently to operative positions for opening and closing the shutter aperture, each pair of paired levers comprising a main pivotally driven lever and an auxiliary lever mounted on the corresponding main lever, baseboard means supporting said levers and said first group and said second group of shutter blades, said baseboard means having for each auxiliary lever two guide slots for guiding travel of a corresponding auxiliary lever during actuation of the corresponding main lever, means for each auxiliary lever connecting it to a corresponding one of said shutter blades of a corresponding group for actuating it to move said one shutter blade of a corresponding group to define a rectangular slit when the shUtter aperture is being opened and closed, said one blade constituting a slit-forming shutter blade, means for each auxiliary lever cooperative with said guide slots for guiding movement of the auxiliary levers for actuating said slit-forming blade of a corresponding group for defining said rectangular slit, and means for each shutter group connecting the shutter blades to a corresponding main lever for actuation thereof by a corresponding main lever.
Claim 2
Dependent Claim
221 words
On a focal plane shutter, a first group or shutter-opening shutter blades, a second group of shutter-closing shutter blades, means defining a shutter aperture, a pair of paired levers for actuating the first and second group of shutter blades independently to operative positions for opening and closing the shutter aperture, each pair of paired levers comprising a main pivotally driven lever and an auxiliary lever mounted on the corresponding main lever, baseboard means supporting said levers and said first group and said second group of shutter blades, said baseboard means having for each auxiliary lever two guide slots for guiding travel of a corresponding auxiliary lever during actuation of the corresponding main lever, means for each auxiliary lever connecting it to a corresponding one of said shutter blades of a corresponding group for actuating it to move said one shutter blade of a corresponding group to define a rectangular slit when the shUtter aperture is being opened and closed, said one blade constituting a slit-forming shutter blade, means for each auxiliary lever cooperative with said guide slots for guiding movement of the auxiliary levers for actuating said slit-forming blade of a corresponding group for defining said rectangular slit, and means for each shutter group connecting the shutter blades to a corresponding main lever for actuation thereof by a corresponding main lever.
Claim 3
Dependent Claim
66 words
On a focal plane shutter according to claim 1 in which said two guide slots have an arcuate configuration and both are configured to effect jointly guided travel of said slit-forming shutter blade of each group parallel to a side boundary of said shutter aperture, said side boundary being striaght, and each said slit-forming shutter blade having a straight edge moved parallel to said side boundary.
Claim 4
Dependent Claim
17 words
On a focal plane shutter according to claim 2, in which both said guide slots are J-shaped.
Claim 5
Dependent Claim
16 words
On a focal plane shutter according to claim 2, in which said guide slots are rectilinear.
Claim 6
Dependent Claim
50 words
On a focal plane shutter according to claim 1, in which said each main lever comprises a guide slot axially thereof, means mounting the corresponding auxiliary lever for axial travel thereon axially of the main lever, and said auxiliary lever having an arm extending away from the corresponding main lever.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |