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US4777662A
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Optical communication process
Assignee: Canon Inc
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Filing: 1987-05-26
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Granted: 1988-10-11
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Expires: 2007-05-26
Abstract
Abstract An optical communication processs is capable of avoiding errors resulting from stray reflection of the transmitted optical signals. For this purpose, the optical receptor of an apparatus is disabled during the transmission of optical signals from the optical transmitter of this apparatus.
Inventors
- 👤 Shinichi Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:37
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/114; H04B10/1143; H04L; H04L1/00; H04L1/12; H04L1/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
An optical communication apparatus comprising: a transmission unit having a light emitting element for transmitting a light signal containing information into an open area; an optical receptor element for receiving a light signal containing information from the open area; a reception unit including a detection circuit for receiving from said optical receptor element a data signal containing the information in the received light signal; memory means for storing information contained in the received light signal; comparing means for comparing the information in the light signal provided by said transmission unit of a first communication apparatus with the information in a light signal received by said optical receptor element from a second optical communication apparatus; control means responsive to said comparing means for re-transmitting information in the data signal, received by said reception unit and stored in said memory means, by means of said transmission unit and said light-emitting element; and counter means for counting the number of re-transmissions made by said transmission unit, said counter means cooperating with said control means to limit the number of re-transmissions of the information in the data signal.
Claim 2
Dependent Claim
184 words
An optical communication apparatus comprising: a transmission unit having a light emitting element for transmitting a light signal containing information into an open area; an optical receptor element for receiving a light signal containing information from the open area; a reception unit including a detection circuit for receiving from said optical receptor element a data signal containing the information in the received light signal; memory means for storing information contained in the received light signal; comparing means for comparing the information in the light signal provided by said transmission unit of a first communication apparatus with the information in a light signal received by said optical receptor element from a second optical communication apparatus; control means responsive to said comparing means for re-transmitting information in the data signal, received by said reception unit and stored in said memory means, by means of said transmission unit and said light-emitting element; and counter means for counting the number of re-transmissions made by said transmission unit, said counter means cooperating with said control means to limit the number of re-transmissions of the information in the data signal.
Claim 3
Dependent Claim
21 words
An optical communication apparatus according to claim 1, further comprising display means for displaying the result obtained from said comparing means.
Claim 4
Dependent Claim
187 words
An optical communication apparatus comprising: a transmission unit having a light emitting element for transmitting a light signal containing information into an open area; an optical receptor element for receiving a light signal containing information from the open area. a reception unit including a detection circuit for receiving from said optical receptor element a data signal containing the information in the received light signal, said reception unit including memory means for storing the information in the data signal; comparing means for comparing the information in the light signal provided by said transmission unit of a first communication apparatus with the information in a light signal received by said optical receptor element from a second optical communication apparatus; control means responsive to said comparing means for re-transmitting information in the data signal, received by said reception unit and stored in said memory means, by means of said transmission unit and said light-emitting element; and counter means for counting the number of re-transmissions made by said transmission unit, said counter means cooperating with said control means to limit the number of re-transmissions of the information in the data signal.
Claim 5
Dependent Claim
187 words
An optical communication apparatus comprising: a transmission unit having a light emitting element for transmitting a light signal containing information into an open area; an optical receptor element for receiving a light signal containing information from the open area. a reception unit including a detection circuit for receiving from said optical receptor element a data signal containing the information in the received light signal, said reception unit including memory means for storing the information in the data signal; comparing means for comparing the information in the light signal provided by said transmission unit of a first communication apparatus with the information in a light signal received by said optical receptor element from a second optical communication apparatus; control means responsive to said comparing means for re-transmitting information in the data signal, received by said reception unit and stored in said memory means, by means of said transmission unit and said light-emitting element; and counter means for counting the number of re-transmissions made by said transmission unit, said counter means cooperating with said control means to limit the number of re-transmissions of the information in the data signal.
Claim 6
Dependent Claim
21 words
An optical communication apparatus according to claim 3, further comprising visualizing means for visualizing the result obtained from said comparing means.
References Cited (Backward Citations)
US4063220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |