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Patent US4658129A successfully refreshed from Google Patents.
US4658129A
Expired / Lapsed
US
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Photoelectric control device which detects changes in light intensity
Assignee: Individual
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Filing: 1985-07-25
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Granted: 1987-04-14
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Expires: 2005-07-25
Abstract
Abstract A photoelectric control device having a photoelectric sensing unit for delivering an output voltage in response to changes of the intensity of light, the output voltage being applied to a capacitor for operating a SCR. When the output voltage reaches a predetermined level the SCR is caused to become conductive or non-conductive. The SCR is connected to a bridge rectifier which causes a triac to become conductive or non-conductive when the SCR becomes conductive or non-conductive, so as to allow electric power to be supplied to a load or to be cut off in response to changes in the intensity of light.
Inventors
- 👤 Jenn-Kang Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:58
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/081
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A photoelectric control device, comprising: a photoelectric sensing unit capable of delivering an output voltage in response to changes of the intensity of light cast on said photoelectric sensing unit; a trigger unit having a capacitor and a silicon controlled rectifier having a gate connected to said capacitor to which said output voltage delivered by said photoelectric sensing unit is applied; a first switching unit capable of supplying a rectified voltage from an A.C. source to said photoelectric sensing unit and said trigger unit and operable by said trigger unit; and a second switching unit operable by said trigger unit in cooperation with said first switching unit when said output voltage varies and reaches a predetermined level, second to selectively allow or cut off the supply of electric current.
Claim 2
Dependent Claim
129 words
A photoelectric control device, comprising: a photoelectric sensing unit capable of delivering an output voltage in response to changes of the intensity of light cast on said photoelectric sensing unit; a trigger unit having a capacitor and a silicon controlled rectifier having a gate connected to said capacitor to which said output voltage delivered by said photoelectric sensing unit is applied; a first switching unit capable of supplying a rectified voltage from an A.C. source to said photoelectric sensing unit and said trigger unit and operable by said trigger unit; and a second switching unit operable by said trigger unit in cooperation with said first switching unit when said output voltage varies and reaches a predetermined level, second to selectively allow or cut off the supply of electric current.
Claim 3
Dependent Claim
69 words
A photoelectric control device as recited in claim 1, wherein said first switching unit is a bridge rectifier having a pair of first terminals adapted to be connected to an A.C. power source, and a pair of second terminals from which said rectified voltage is delivered to said trigger unit and said photoelectric sensing unit; and said second switching unit is a triac operatively connected to said bridge rectifier.
References Cited (Backward Citations)
US3176189A
Cited
US3529214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |