Patent US3195966A successfully refreshed from Google Patents.
Patent US4793000A successfully refreshed from Google Patents.
US4793000A
Expired / Lapsed
US
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Light signal receiver
Assignee: Canon Inc
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Filing: 1986-10-17
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Granted: 1988-12-20
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Expires: 2006-10-17
Abstract
Abstract A light signal receiver comprises a photo-sensing element for sensing a modulated light signal, conversion means for converting the light signal sensed by the photosensing element to an electrical signal, and resonance means having a filter element or resonator connected in parallel with a load resistor of the photo-sensing element.
Inventors
- 👤 Haruo Imano
- 👤 Izumi Ichikawa
- 👤 Satoshi Ogiwara
- 👤 Genmei Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:03
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A light signal receiver for detecting information carried on a modulated light signal, said receiver comprising: light-sensitive receiving means for receiving the modulated light signal; converting means for converting the light signal received by said receiving means to an electrical signal; and resonance means connected to said receiving means and said converting means, for providing a resonant frequency in said receiver, said resonance means having a mechanical vibration element whose resonant frequency is tuned to a modulation frequency of the received signal, thereby to improve detection of the information carried on the modulated light signal.
Claim 2
Dependent Claim
95 words
A light signal receiver for detecting information carried on a modulated light signal, said receiver comprising: light-sensitive receiving means for receiving the modulated light signal; converting means for converting the light signal received by said receiving means to an electrical signal; and resonance means connected to said receiving means and said converting means, for providing a resonant frequency in said receiver, said resonance means having a mechanical vibration element whose resonant frequency is tuned to a modulation frequency of the received signal, thereby to improve detection of the information carried on the modulated light signal.
Claim 3
Dependent Claim
40 words
A light signal receiver according to claim 1, wherein said receiving means is a photo-sensing element, and said resonance means is a resonance circuit having the mechanical vibration element connected in parallel with a load resistor of said photo-sensing element.
Claim 4
Dependent Claim
39 words
A light signal receiver according to claim 1, wherein said receiving means is a photo-sensing element, and said resonance means is a resonance circuit having a crystal resonator connected in parallel with a load resistor of said photo-sensing element.
Claim 5
Dependent Claim
15 words
A light signal receiver according to claim 1, wherein said receiving means is a photo-diode.
Claim 6
Dependent Claim
48 words
A light signal receiver comprising: a photo-sensing element for sensing a modulated light signal; conversion means for converting the light signal sensed by said photo-sensing element to an electrical signal; and resonance means having a filter element connected in parallel with a load resistor of said photo-sensing element.
Claim 7
Dependent Claim
48 words
A light signal receiver comprising: a photo-sensing element for sensing a modulated light signal; conversion means for converting the light signal sensed by said photo-sensing element to an electrical signal; and resonance means having a filter element connected in parallel with a load resistor of said photo-sensing element.
Claim 8
Dependent Claim
47 words
A light signal receiver comprising: a photo-sensing element for sensing a modulated light signal; conversion means for converting the light signal sensed by said photo-sensing element to an electrical signal; and resonance means having a resonator connected in parallel with a load resistor of said photo-sensing element.
Claim 9
Dependent Claim
47 words
A light signal receiver comprising: a photo-sensing element for sensing a modulated light signal; conversion means for converting the light signal sensed by said photo-sensing element to an electrical signal; and resonance means having a resonator connected in parallel with a load resistor of said photo-sensing element.
Claim 10
Dependent Claim
40 words
A light signal receiver according to claim 1, wherein said receiving means is a photo-sensing element, and said resonance means is a resonance circuit having a ceramic vibrating element connected in parallel with a load resistor of said photo-sensing element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |