Patent US4864651A successfully refreshed from Google Patents.
US4864651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light communication apparatus with tracking ability
Assignee: Canon Inc
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Filing: 1986-10-17
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Granted: 1989-09-05
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Expires: 2006-10-17
Abstract
Abstract A light signal receiver comprises a plurality of photo-sensors, a detector for detecting signal levels of light signals sensed by the photo-sensors, a selector for selecting those photo-sensors which result in a proper output signal, and output means for combining the signals sensed by the selected photo-sensors to produce the output signal.
Inventors
- 👤 Satoshi Ogiwara
- 👤 Izumi Ichikawa
- 👤 Haruo Imano
- 👤 Genmei Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:27
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A light signal receiver comprising: a plurality of photo-sensors; detection means for detecting signal levels of light signals sensed by said photo-sensors; selection means for selecting those photo-sensors which result in a proper signal based on the signal levels detected by said detection means; and output means for combining the signals from the ones of said photo-sensors selected by said selection means to produce a reception signal, wherein said selection means calculates a ratio of a sum of signal levels of the sensed signals as summed in descending order and a noise level corresponding to the number of summed photo-sensors and selects a set of photo-sensors which assures the highest ratio.
Claim 2
Dependent Claim
111 words
A light signal receiver comprising: a plurality of photo-sensors; detection means for detecting signal levels of light signals sensed by said photo-sensors; selection means for selecting those photo-sensors which result in a proper signal based on the signal levels detected by said detection means; and output means for combining the signals from the ones of said photo-sensors selected by said selection means to produce a reception signal, wherein said selection means calculates a ratio of a sum of signal levels of the sensed signals as summed in descending order and a noise level corresponding to the number of summed photo-sensors and selects a set of photo-sensors which assures the highest ratio.
Claim 3
Dependent Claim
18 words
A light signal receiver according to claim 1, wherein said output means analog-adds the signals of the photo-sensors.
Claim 4
Dependent Claim
90 words
A light signal receiving comprising: a plurality of photo-sensors; detection means for detecting signal levels of light signals sensed by said photo-sensors; and selection means for selecting those photo-sensors with result in a proper signal based on the signal levels detected by said detection means, wherein said selection means calculates a ratio of a sum of signal levels of the sensed signals as summed in descending order and a noise level corresponding to the number of summed photo-sensors and selects a set of said photo-sensors which assures the highest ratio.
Claim 5
Dependent Claim
90 words
A light signal receiving comprising: a plurality of photo-sensors; detection means for detecting signal levels of light signals sensed by said photo-sensors; and selection means for selecting those photo-sensors with result in a proper signal based on the signal levels detected by said detection means, wherein said selection means calculates a ratio of a sum of signal levels of the sensed signals as summed in descending order and a noise level corresponding to the number of summed photo-sensors and selects a set of said photo-sensors which assures the highest ratio.
Claim 6
Dependent Claim
41 words
A light signal receiver according to claim 3, further comprising combining means for combining the signals sensed by the ones of said photo-sensors which are selected by said selection means and means for outputting the combined signal as a reception signal.
Claim 7
Dependent Claim
28 words
A light signal receiver according to claim 4, wherein said combining means analog-adds the signals of the ones of said photo-sensors which are selected by said selection means.
Claim 8
Dependent Claim
114 words
A light communication system comprising: a transmitter for transmitting information by means of a light signal; and a receiver for receiving the light signal from said transmitter, including detection means for detecting a displacement of the light signal on the receiver, and means for sending a detection signal of said detection means to said transmitter, said transmitter adjusting the transmission signal in accordance with the detection signal sent from said receiver; wherein said receiver includes a plurality of photo-sensing means, and said detection means prepares light intensity distribution data based on the light signals sensed by said photo-sensing means and detects the displacement of the light signal based on the light intensity distribution data.
Claim 9
Dependent Claim
114 words
A light communication system comprising: a transmitter for transmitting information by means of a light signal; and a receiver for receiving the light signal from said transmitter, including detection means for detecting a displacement of the light signal on the receiver, and means for sending a detection signal of said detection means to said transmitter, said transmitter adjusting the transmission signal in accordance with the detection signal sent from said receiver; wherein said receiver includes a plurality of photo-sensing means, and said detection means prepares light intensity distribution data based on the light signals sensed by said photo-sensing means and detects the displacement of the light signal based on the light intensity distribution data.
Claim 10
Dependent Claim
27 words
A light communication system according to claim 6, wherein said light intensity distribution data contains information regarding positions of said photo-sensing means and their corresponding light intensities.
Claim 11
Dependent Claim
26 words
A light communication system according to claim 6, wherein the transmission signal is adjusted by adjusting a transmission position of the light signal from the transmitter.
Claim 12
Dependent Claim
27 words
A light communication system according to claim 6, wherein the transmission signal is adjusted by adjusting the light intensity of the light signal transmitted from the transmitter.
Claim 13
Dependent Claim
23 words
A light communication system according to claim 6, wherein the detection signal is sent from the receiver to the transmitter through a line.
Claim 14
Dependent Claim
23 words
A light communication system according to claim 6, wherein the detection signal is sent from the receiver to the transmitter by light communication.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |