US3672282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for driving camera shutter curtains
Assignee: Nikon Corp
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Filing: 1970-01-16
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Granted: 1972-06-27
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Expires: 1990-01-16
Abstract
Abstract The working energy discharged by a driving spring for accelerating the shutter curtains and their associated moving members is mostly recovered by said springs during the deceleration stage for using the recovered energy for the next acceleration operation. The work required for the shutter charging is extremely reduced, while the shutter curtain travelling time is rather shortened.
Inventors
- 👤 Takeo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A focal plane shutter for a camera comprising an exposure aperture, a first shutter member and a second shutter member, means mounting each of said shutter members for movement along a path to open and close said aperture, and first and second means for separately actuating said respective shutter members to effect high speed exposure; each of said actuating means comprising a. an operating lever connected to said shutter member and moved therewith; b. a main spring for storing shutter driving energy; c. means for transferring said driving energy to said operating lever to accelerate said shutter member rapidly to its final velocity during movement along a first portion of said path; d. means for terminating actuation of said energy transferring means during movement of said shutter member along the remaining portion of said path; e. means for controlling said operating lever to decelerate said shutter member to zero velocity while charging said main spring with a part of the kinetic energy of said shutter member during movement along said remaining portion of said path; and f. a shutter charging lever operable by hand for moving said operating lever to its starting position.
Claim 2
Dependent Claim
193 words
A focal plane shutter for a camera comprising an exposure aperture, a first shutter member and a second shutter member, means mounting each of said shutter members for movement along a path to open and close said aperture, and first and second means for separately actuating said respective shutter members to effect high speed exposure; each of said actuating means comprising a. an operating lever connected to said shutter member and moved therewith; b. a main spring for storing shutter driving energy; c. means for transferring said driving energy to said operating lever to accelerate said shutter member rapidly to its final velocity during movement along a first portion of said path; d. means for terminating actuation of said energy transferring means during movement of said shutter member along the remaining portion of said path; e. means for controlling said operating lever to decelerate said shutter member to zero velocity while charging said main spring with a part of the kinetic energy of said shutter member during movement along said remaining portion of said path; and f. a shutter charging lever operable by hand for moving said operating lever to its starting position.
Claim 3
Dependent Claim
98 words
A focal plane shutter according to claim 1, wherein said energy transferring means includes a pivotable lever biased by said main spring and a roller provided on said pivotable lever; said operating lever having a first arm connected to said shutter member, a second arm engageable with said roller during movement of said shutter member over said said first portion of said path to accelerate said shutter member and a third arm engageable with said roller against said main spring during movement of said shutter member over said remaining portion of said path to decelerate said shutter member.
Claim 4
Dependent Claim
64 words
A focal plane shutter according to claim 2, wherein said actuation terminating means includes a detent pawl biased toward said pivotable lever and first and second detents formed on said pivotable lever; the first detent engaging said detent pawl when said second arm disengages said roller, the second detent engaging said detent pawl after said pivoted lever has been moved by said third arm.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |