US4644149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric transducer element
Assignee: Canon Inc
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Filing: 1984-04-16
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Granted: 1987-02-17
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Expires: 2004-04-16
Abstract
Abstract A photoelectric transducer element responsive to ambient light and a combination of ambient and projected light from light emitting apparatus operates with a predetermined cycle by signals from an oscillator. This produces respective output signals which are then stored on first and second storing apparatus. Signals from the storing apparatus provide information necessary for photographing, since the storing operation is synchronized with the oscillating operation.
Inventors
- 👤 Tokuichi Tsunekawa
- 👤 Takashi Kawabata
- 👤 Yuichi Sato
- 👤 Susumu Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:49
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/48; G01S7/481; G01S7/4816; G01S7/491; G01S7/4912; G01S7/4913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
247 words
A photoelectric transducer device comprising: (a) light sensitive means for receiving the reflected light from an object to produce an electrical signal corresponding to the reflected light from the object, said light sensitive means having an output to produce the electrical signal; (b) first memory means for memorizing an amplified electrical signal; (c) second memory means for memorizing an amplified electrical signal; (d) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means, the first amplifying transistor means having a control electrode; (e) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means, the second amplifying transistor means having a control electrode; (f) means for connecting both control electrodes of the first and second amplifying transistor means to the output of the light sensitive means; (g) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of a light emitting means; (h) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (i) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
Claim 2
Dependent Claim
247 words
A photoelectric transducer device comprising: (a) light sensitive means for receiving the reflected light from an object to produce an electrical signal corresponding to the reflected light from the object, said light sensitive means having an output to produce the electrical signal; (b) first memory means for memorizing an amplified electrical signal; (c) second memory means for memorizing an amplified electrical signal; (d) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means, the first amplifying transistor means having a control electrode; (e) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means, the second amplifying transistor means having a control electrode; (f) means for connecting both control electrodes of the first and second amplifying transistor means to the output of the light sensitive means; (g) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of a light emitting means; (h) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (i) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
Claim 3
Dependent Claim
20 words
A photoelectric transducer device according to claim 1, wherein the first and second amplifying transistor means form a current mirror.
Claim 4
Dependent Claim
30 words
A photoelectric transducer according to claim 1, wherein said first control means includes a transistor having a main electrode connected to a main electrode of said first amplifying transistor means.
Claim 5
Dependent Claim
31 words
A photoelectric transducer device according to claim 1, wherein said second control means includes a transistor having a main electrode connected to a main electrode of said second amplifying transistor means.
Claim 6
Dependent Claim
16 words
A photoelectric transducer device according to claim 1, wherein said output means includes a differential amplifier.
Claim 7
Dependent Claim
27 words
A photoelectric transducer device according to claim 1, wherein said first memory means includes a capacitor connected to a main electrode of said first amplifying transistor means.
Claim 8
Dependent Claim
194 words
A photoelectric transducer device comprising: (a) light sensitive means for receiving the reflected light from an object to produce an electrical signal corresponding to the reflected light from the object; (b) first memory means for memorizing an amplified electrical signal; (c) second memory means for memorizing an amplified electrical signal; (d) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means; (e) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means; (f) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of a light emitting means; (g) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (h) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
Claim 9
Dependent Claim
194 words
A photoelectric transducer device comprising: (a) light sensitive means for receiving the reflected light from an object to produce an electrical signal corresponding to the reflected light from the object; (b) first memory means for memorizing an amplified electrical signal; (c) second memory means for memorizing an amplified electrical signal; (d) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means; (e) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means; (f) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of a light emitting means; (g) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (h) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
Claim 10
Dependent Claim
205 words
A photoelectric transducer device comprising: (a) light emitting means for intermittently projecting light to an object; (b) light sensitive means for receiving the reflected light from the object to produce an electrical signal corresponding to the reflected light from the object; (c) first memory means for memorizing an amplified electrical signal; (d) second memory means for memorizing an amplified electrical signal; (e) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means; (f) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means; (g) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of the light emitting means; (h) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (i) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
Claim 11
Dependent Claim
205 words
A photoelectric transducer device comprising: (a) light emitting means for intermittently projecting light to an object; (b) light sensitive means for receiving the reflected light from the object to produce an electrical signal corresponding to the reflected light from the object; (c) first memory means for memorizing an amplified electrical signal; (d) second memory means for memorizing an amplified electrical signal; (e) first amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal to the first memory means; (f) second amplifying transistor means for amplifying the electrical signal and transmitting the amplified electrical signal therefrom to the second memory means; (g) first control means connected to the first amplifying transistor means for permitting the energization of the first amplifying transistor means in synchronism with energization of the light emitting means; (h) second control means connected to the second amplifying transistor means for permitting the energization of the second amplifying transistor means in synchronism with de-energization of the light emitting means; and (i) output means connected to the first and second memory means for producing an output signal corresponding to the difference between the electrical signal memorized in the first memory means and the electrical signal memorized in the second memory means.
References Cited (Backward Citations)
US4274735A
Cited
US4319133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |