US3568582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic shutter
Assignee: Konica Minolta Inc
•
Filing: 1968-09-10
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Granted: 1971-03-09
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Expires: 1988-09-10
Abstract
Abstract An electronic shutter comprising a time control circuit for maintaining the shutter open for a variable period of time inversely related to the intensity of the light reflected from the subject and sensed at the camera, a flash discharge circuit which initiates illumination upon opening of the shutter, and a flash control circuit operative to cause said flash discharge circuit to cease illumination when the timing control circuit generates a shutter-closing signal.
Inventors
- 👤 Yasuo Uchida
- 👤 Hideo Akimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:40
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; H05B41/325; G; G03; G03B; G03B9/00; G03B9/70
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
118 words
The combination with a camera including a shutter and a shutter release mechanism of: 1. first circuit means for controlling the period of time said shutter is open according to a plurality of variables including the intensity of light reflected from the subject, said first circuit means including a switch controlled by the shutter release mechanism; 2. second circuit means for providing illumination of the subject for a variable period of time beginning substantially simultaneously with the closing of said switch of said first circuit means; and 3. third circuit means controlled by a shutter-closing signal from said first circuit means and operative in response thereto to cause said second circuit means to cease illumination of the subject.
Claim 2
Dependent Claim
118 words
The combination with a camera including a shutter and a shutter release mechanism of: 1. first circuit means for controlling the period of time said shutter is open according to a plurality of variables including the intensity of light reflected from the subject, said first circuit means including a switch controlled by the shutter release mechanism; 2. second circuit means for providing illumination of the subject for a variable period of time beginning substantially simultaneously with the closing of said switch of said first circuit means; and 3. third circuit means controlled by a shutter-closing signal from said first circuit means and operative in response thereto to cause said second circuit means to cease illumination of the subject.
Claim 3
Dependent Claim
30 words
second circuit means for providing illumination of the subject for a variable period of time beginning substantially simultaneously with the closing of said switch of said first circuit means; and
Claim 4
Dependent Claim
30 words
second circuit means for providing illumination of the subject for a variable period of time beginning substantially simultaneously with the closing of said switch of said first circuit means; and
Claim 5
Dependent Claim
16 words
The combination according to claim 1 wherein said first circuit means includes a charging circuit comprising:
Claim 6
Dependent Claim
13 words
a photovoltaic cell connected across the emitter-base junction of said first transistor; and
Claim 7
Dependent Claim
13 words
a photovoltaic cell connected across the emitter-base junction of said first transistor; and
Claim 8
Dependent Claim
15 words
a first normally charged capacitance connected across said first and second load current electrodes; and
Claim 9
Dependent Claim
15 words
a first normally charged capacitance connected across said first and second load current electrodes; and
Claim 10
Dependent Claim
85 words
a triggering circuit comprising a pulse transformer having a primary and secondary windings, said primary winding being connected in series with a normally open switch and a second normally charged capacitance, said normally open switch being closed substantially simultaneously with the closing of said switch of said first circuit means to initiate illumination of the subject by said second circuit means substantially simultaneously with the opening of the shutter by inducing a triggering pulse in said secondary winding which is connected to said control electrode.
Claim 11
Dependent Claim
85 words
a triggering circuit comprising a pulse transformer having a primary and secondary windings, said primary winding being connected in series with a normally open switch and a second normally charged capacitance, said normally open switch being closed substantially simultaneously with the closing of said switch of said first circuit means to initiate illumination of the subject by said second circuit means substantially simultaneously with the opening of the shutter by inducing a triggering pulse in said secondary winding which is connected to said control electrode.
Claim 12
Dependent Claim
34 words
a capacitance connected in series with the collector-base junction of said first transistor; whereby the shutter is maintained open for the period of time required for said capacitance to charge to a predetermined level.
Claim 13
Dependent Claim
34 words
a capacitance connected in series with the collector-base junction of said first transistor; whereby the shutter is maintained open for the period of time required for said capacitance to charge to a predetermined level.
Claim 14
Dependent Claim
12 words
The combination according to claim 1 wherein said second circuit means comprises:
Claim 15
Dependent Claim
30 words
third circuit means controlled by a shutter-closing signal from said first circuit means and operative in response thereto to cause said second circuit means to cease illumination of the subject.
Claim 16
Dependent Claim
30 words
third circuit means controlled by a shutter-closing signal from said first circuit means and operative in response thereto to cause said second circuit means to cease illumination of the subject.
Claim 17
Dependent Claim
43 words
The combination according to claim 1 wherein said third circuit means includes a normally nonconductive semiconductor switch having anode, cathode and gate electrodes, said cathode and gate electrodes being connected to said first circuit means for application of bias and triggering signals thereto.
Claim 18
Dependent Claim
55 words
The combination according to claim 4 wherein said bias signal is applied across said gate and cathode electrodes when the shutter is opened by closing said switch of said first circuit means, and said triggering signal is applied across said gate and cathode electrodes when said shutter-closing signal is generated by said first circuit means.
Claim 19
Dependent Claim
40 words
The combination according to claim 4 wherein said semiconductor switching means controls a discharge path for a third normally charged capacitance through the primary winding of a second pulse transformer, the secondary winding of which controls a low-impedance discharge tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |