Patent US3918077A successfully refreshed from Google Patents.
US3918077A
Expired / Lapsed
US
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Translational shutter system
Assignee: Terminal Data Corp
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Filing: 1974-05-06
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Granted: 1975-11-04
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Expires: 1994-05-06
Abstract
Abstract A translational bi-directional shutter system, electrically operable, and having control logic coactive with exposure-timedetermination instrumentalities. Sensors detect the end positions of a blade shutter. A large central aperture allows exposure, and the alignment thereof with the optical path is sensed by counting actuation pulses, or by a third sensor. Typically the blade is moved by a stepper motor.
Inventors
- 👤 John S Burton
- 👤 Ronald L Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A translational bi-directional shutter system comprising; a. a shutter blade (4) having an aperture (5), b. means to reciprocate (9,10,11) said blade transversely of an optical path to selectively moved said aperture into and out of alignment with said optical path to define open closed positions respectively, c. plural sensors (16,17) spaced to sense the position of said blade, and d. logic means (35-56) controlled by said sensors to actuate said means to reciprocate said blade, whereby said blade is selectively translated from a first closed position to said open position with respect to said optical path, thereafter farther to a second closed position, and thereafter to selectively repeat this sequence with the blade moving in the opposite direction.
Claim 2
Dependent Claim
119 words
A translational bi-directional shutter system comprising; a. a shutter blade (4) having an aperture (5), b. means to reciprocate (9,10,11) said blade transversely of an optical path to selectively moved said aperture into and out of alignment with said optical path to define open closed positions respectively, c. plural sensors (16,17) spaced to sense the position of said blade, and d. logic means (35-56) controlled by said sensors to actuate said means to reciprocate said blade, whereby said blade is selectively translated from a first closed position to said open position with respect to said optical path, thereafter farther to a second closed position, and thereafter to selectively repeat this sequence with the blade moving in the opposite direction.
Claim 3
Dependent Claim
82 words
The shutter system of claim 1, in which; a. one sensor (17) is positioned at an extremity of the traverse of said blade such that the blade affects it at said first closed position and one sensor (16) is positioned at another extremity of the traverse of said blade such that the blade affects it at said second closed position, and b. said shutter blade has an opaque portion (15,14) to affect each sensor when it is in the corresponding closed position.
Claim 4
Dependent Claim
54 words
The shutter system of claim 1, in which; a. said means to reciprocate said blade includes a stepper motor (9), and b. said logic means includes counting means (53) programmed to supply to said stepper motor a selected number of pulses to translate said blade from a closed (5'') to the open (5) position.
Claim 5
Dependent Claim
124 words
The shutter system of claim 3, in which said logic means includes; a. a pair of flip-flops (36,40), b. a pair of gates (41,44), c. a pair of counters (51,53) having carry outputs, d. amplifier means (42) to drive said stepper motor, e. a connection (J) from one said sensor to one said flip-flop (36) and therethrough to a said gate (41) whereby said amplifier means is energized to drive said stepper motor in the appropriate direction to open the shutter, and f. a connection from a said counter (51) to said gates whereby a carry output therefrom stops said stepper motor when substantially half of the steps required to translate said blade from said first to said second closed positions have been executed.
Claim 6
Dependent Claim
73 words
The shutter system of claim 2, in which; a. each said sensor is comprised of a light-emitting (16'') and a light-sensitive (16'''') means, b. each extremity of said shutter blade has a projection (14), which blocks the path between said light-emitting and said light-sensitive means when said blade is at an extremIty of travel, and c. intermediate the extremities said shutter blade includes rack means (11) for traversing the blade between said extremities.
Claim 7
Dependent Claim
84 words
The shutter system of claim 4, which additionally includes; a. a first gate (45) connected to one (41) of said pair of gates and to a said sensor (17,35), b. a second gate (46) connected to the other (44) of said pair of gates and to an other sensor (16,37), c. a third gate (47) connected to the outputs of said first and second gates and to relaxation logic (50) to logically state that said shutter blade is at the end of a traverse.
Claim 8
Dependent Claim
26 words
The shutter system of claim 1, which additionally includes; a. plural oppositely disposed grooved rollers (7) positioned to carry said shutter blade in the translation thereof.
Claim 9
Dependent Claim
54 words
The shutter system of claim 1, in which; a. one said sensor (16 or 17) is positioned at each extremity of traverse of said shutter and one said sensor (18) is positioned intermediate these extremities, and b. said blade has opaque portions (14,15,19) to selectively influence only one said sensor at any one time.
Claim 10
Dependent Claim
73 words
The shutter system of claim 8, in which said logic means includes; a. a counter (51), b. relaxation and gating logic (36,40 & 41,44) connected to each extremity sensor (16,17) and to said counter to control the traverse of said shutter blade (4), and c. further relaxation logic (55'') connected to the intermediate sensor (18) and to said counter (51) to interrupt the traverse of said shutter blade intermediate the extremity positions thereof.
References Cited (Backward Citations)
US1366158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |