US3733991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens shutter
Assignee: Minolta Co Ltd
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Filing: 1970-05-28
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Granted: 1973-05-22
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Expires: 1990-05-28
Abstract
Abstract In a camera lens shutter apparatus having an exposure time setting member, an exposure setting member, and shutter blades, and structure for opening and closing the shutter blades, a first control mechanism controls the speed of the shutter blades at a maximum aperture setting and a second control mechanism additionally controls the speed of the shutter blades so that the opening and closing time interval thereof corresponds to a settable exposure time setting. A retarding mechanism is interlocked with the blade driving means for varying the opening and closing speed of the shutter blades in accordance with the setting of an exposure time setting member.
Inventors
- 👤 T Kobayashi
- 👤 M Mino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18; G03B9/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
Camera lens shutter apparatus comprising: an exposure time setting member; an aperture setting member; at least one blade member; a first driven member for opening said blade member to a maximum aperture and for closing said blade member from said maximum aperture as a function of position thereof; a second driven member; means for driving said second driven member; means for retarding said second driven member; means for controlling the acceleration and for varying the speed of said second driven member in accordance with an exposure time set by said exposure time setting member; means for transmitting the movement of said second driven member to said first driven member; and means for adjusting said means for transmitting to change the rate of transmission of movement of said second driven member in accordance with the aperture set by said aperture setting member.
Claim 2
Dependent Claim
141 words
Camera lens shutter apparatus comprising: an exposure time setting member; an aperture setting member; at least one blade member; a first driven member for opening said blade member to a maximum aperture and for closing said blade member from said maximum aperture as a function of position thereof; a second driven member; means for driving said second driven member; means for retarding said second driven member; means for controlling the acceleration and for varying the speed of said second driven member in accordance with an exposure time set by said exposure time setting member; means for transmitting the movement of said second driven member to said first driven member; and means for adjusting said means for transmitting to change the rate of transmission of movement of said second driven member in accordance with the aperture set by said aperture setting member.
Claim 3
Dependent Claim
25 words
Camera lens shutter apparatus as in claim 1 wherein said first driving member closes said at least one blade member subsequent to the opening thereof.
Claim 4
Dependent Claim
76 words
Camera lens shutter apparatus as in claim 2 wherein said means for retarding further includes a first lever connected to said first driven means, a second lever, delay means connected to said second lever for controlling the speed of movement thereof, and means adjustable in accordance with the setting of said exposure time setting member and connected to said first and second levers whereby the movement of said first lever is transmitted to said second lever.
Claim 5
Dependent Claim
44 words
Camera lens shutter apparatus as in claim 3 wherein said delay means includes a rotatable disc of electrically conductive material, a gear train coupled between said second lever and said disc, electromagnetic means for braking said disc, and means for controlling said electromagnetic member.
Claim 6
Dependent Claim
72 words
Camera lens shutter apparatus as in claim 3 wherein said first driven member includes an intermediate ring rotatable for a predetermined amount from a start position and returnable to said start position, a sector ring movable with said at least one blade member, and an intermediate lever connected between said intermediate ring and said sector ring and rotatable about an axis movable in accordance with the setting of said aperture setting member.
Claim 7
Dependent Claim
126 words
Camera lens shutter apparatus as in claim 1 wherein said first driven member includes an operating member biased to close said at least one blade member, means for retaining said operating member in a rest position, means for releasing said means for retaining, means for actuating said means for releasing, said releasing means including an electromagnet, said means for actuating including means for switching to control said electromagnet, means for actuating said means for switching movable with said at least one blade member, said means for switching is connected to said first control means and moved in accordance with the setting of said aperture setting member, and said first control means controls said means for retarding in accordance with the positioning of said means for switching.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |