Patent US4549314A successfully refreshed from Google Patents.
US4549314A
Expired / Lapsed
US
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Optical communication apparatus
Assignee: Canon Inc
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Filing: 1982-12-16
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Granted: 1985-10-22
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Expires: 2002-12-16
Abstract
Abstract An optical communication apparatus has the transmission/reception modules which perform conversion of a light signal from an LED into an electric signal and vice versa. A movable shutter is located above the monitoring window of a light guide so as to allow prevention of crosstalk. A monitoring light-receiving element can be included to allow monitoring of the status of the light signal. A signaling device such as an indicator, a buzzer or the like can be operated in accordance with an output signal from the monitoring light-receiving element.
Inventors
- 👤 Shunichi Masuda
- 👤 Yukio Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/80; H04B10/85; H04B10/07; H04B10/075; H04B10/077; H04B10/0779
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
An optical communication apparatus comprising: conversion means for converting an electric signal representing predetermined data to a visible light signal in order to transmit the predetermined data as the light signal; transmission means comprising an optical fiber for transmitting the light signal from the conversion means to a terminal therethrough; light guide means for guiding leaked light from the light signal from the conversion means, which leaked light is not transmitted through the transmission means; window means for enabling visual monitoring of the state of operation of the conversion means by means of the leaked light guided by the light guide means; and shield means for shielding the window means from the exterior so that exterior light entering through the light guide means does not have harmful influence on the light signal from the conversion means.
Claim 2
Dependent Claim
136 words
An optical communication apparatus comprising: conversion means for converting an electric signal representing predetermined data to a visible light signal in order to transmit the predetermined data as the light signal; transmission means comprising an optical fiber for transmitting the light signal from the conversion means to a terminal therethrough; light guide means for guiding leaked light from the light signal from the conversion means, which leaked light is not transmitted through the transmission means; window means for enabling visual monitoring of the state of operation of the conversion means by means of the leaked light guided by the light guide means; and shield means for shielding the window means from the exterior so that exterior light entering through the light guide means does not have harmful influence on the light signal from the conversion means.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |