Patent US4124545A successfully refreshed from Google Patents.
Patent US4614873A successfully refreshed from Google Patents.
US4614873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal isolator with optical fiber grounding means
Assignee: Toshiba Corp
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Filing: 1983-11-04
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Granted: 1986-09-30
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Expires: 2003-11-04
Abstract
Abstract There is provided an optically controlling apparatus including light emitting diodes and optical fiber bundles which transmit light signals from these light emitting diodes to photothyristors in a controlled circuit and control the conduction states of these photothyristors. The optical fiber bundles are electrically grounded.
Inventors
- 👤 Tadashi Umeji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:51
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/79; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/092
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
An electro-optical system to optically control a circuit comprising: light elmitting means operatively connectible to a first voltage; light receiving means provided in the circuit and operatively connectible to a second voltage souce having a higher voltage than said first voltage source; optical fiber means arranged electrically isolated from said light emitting means and operable to transmit light signals from said light emitting means to said light receiving means to control the conduction states of said light receiving means; and grounding means for electrically grounding said optical fiber means to cause leakage currents flowing through said optical fiber means to be discharged to ground.
Claim 2
Dependent Claim
104 words
An electro-optical system to optically control a circuit comprising: light elmitting means operatively connectible to a first voltage; light receiving means provided in the circuit and operatively connectible to a second voltage souce having a higher voltage than said first voltage source; optical fiber means arranged electrically isolated from said light emitting means and operable to transmit light signals from said light emitting means to said light receiving means to control the conduction states of said light receiving means; and grounding means for electrically grounding said optical fiber means to cause leakage currents flowing through said optical fiber means to be discharged to ground.
Claim 3
Dependent Claim
43 words
An electro-optical system to optically control a circuit according to claim 1, wherein said optical fiber means has a connector portion attached to one end portion thereof and said grounding means has a grounded chassis which is electrically connected to said connector portion.
Claim 4
Dependent Claim
45 words
An electro-optical system to optically control a circuit according to claim 2, wherein said light emitting means comprises a series circuit of a plurality of light emitting elements and switching mean and a control signal generator for controlling the conduction state of said switching means.
Claim 5
Dependent Claim
31 words
An electro-optical system to optically control a circuit according to claim 3, further comprising an insulating member for electrically isolating and holding said light emitting elements from said optical fiber means.
Claim 6
Dependent Claim
45 words
An electro-optical system to optically control a circuit according to claim 1, wherein said light emitting means comprises a series circuit of a plurality of light emitting elements and switching means and a control signal generator for controlling the conduction state of said switching means.
Claim 7
Dependent Claim
31 words
An electro-optical system to optically control a circuit according to claim 5, further comprising an insulating member for electrically isolating and holding said light emitting elements from said optical fiber means.
Claim 8
Dependent Claim
29 words
An electro-optical system to optically control a circuit as recited in claim 3, wherein said light receiving means comprises a series circuit of a plurality of light receiving elements.
Claim 9
Dependent Claim
29 words
An electro-optical system to optically control a circuit as recited in claim 4, wherein said light receiving means comprises a series circuit of a plurality of light receiving elements.
Claim 10
Dependent Claim
29 words
An electro-optical system to optically control a circuit as recited in claim 5, wherein said light receiving means comprises a series circuit of a plurality of light receiving elements.
Claim 11
Dependent Claim
29 words
An electro-optical system to optically control a circuit as recited in claim 6, wherein said light receiving means comprises a series circuit of a plurality of light receiving elements.
References Cited (Backward Citations)
US3524986A
Cited
US3590344A
Cited
US3809908A
Cited
US3859536A
Cited
US4222629A
Cited
US4273413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |