US4745294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photocoupler with light emitting and receiving elements coupled through a soft resin
Assignee: Sharp Corp
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Filing: 1986-03-14
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Granted: 1988-05-17
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Expires: 2006-03-14
Abstract
Abstract A photocoupler comprises a light-emitting element and a light-receiving element which are optically coupled through a soft light-transmissive resin and covered by a light-blocking resin. The light-emitting element is covered by a light-transmissive protective hard resin and hence is protected against external pressure.
Inventors
- 👤 Ikuo Kohashi
- 👤 Hajime Kashida
- 👤 Shin Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:11
CPC Classifications
H; H10; H10F; H10F55/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A photocoupler comprising an assembly including a light-emitting element, a hard light-transmissive protective resin covering said light-emitting element, a light-receiving element and a soft light-transmissive resin, said light-emitting element and said light-receiving element being optically coupled through said soft light-transmissive resin, and a light-blocking resin which is formed by transfer molding and encapsulates said assembly therein.
Claim 2
Dependent Claim
56 words
A photocoupler comprising an assembly including a light-emitting element, a hard light-transmissive protective resin covering said light-emitting element, a light-receiving element and a soft light-transmissive resin, said light-emitting element and said light-receiving element being optically coupled through said soft light-transmissive resin, and a light-blocking resin which is formed by transfer molding and encapsulates said assembly therein.
Claim 3
Dependent Claim
41 words
The photocoupler of claim 1 further comprising a lead frame to which said light-emitting element is attached, said lead frame having an indentation of depth greater than the height of said light-emitting element, said light-emitting element being disposed in said indentation.
Claim 4
Dependent Claim
18 words
The photocoupler of claim 2 wherein said light-emitting element is attached to said lead frame by die bonding.
References Cited (Backward Citations)
US4160308A
Cited
US4412135A
Cited
JPS5688383A
Cited
US4418284A
Cited
JPS57169279A
Cited
JPS59130487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |