US4015149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensating device for devices having semiconductors
Assignee: Canon Inc
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Filing: 1975-06-03
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Granted: 1977-03-29
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Expires: 1995-06-03
Abstract
Abstract A temperature compensating device for devices comprising semiconductors. The temperature compensating device comprises a temperature compensating circuit, such as a circuit including a diode, and a current control circuit which adjusts the quantity of the electric current flowing through the temperature compensating circuit. The temperature characteristic of the temperature compensating circuit is mutually compensatory with that of the output of the device comprising semiconductors. When the temperature characteristic of the output of said temperature compensating circuit differs from that of the output of such semiconductor device, the current control circuit causes a current which corresponds to the difference between the temperature coefficient of the compensating circuit and that of the semiconductor device to flow through the temperature compensating circuit, so that satisfactory temperature compensation can be accomplished.
Inventors
- 👤 Tokuichi Tsunekawa
- 👤 Masanori Uchidoi
- 👤 Tetsuya Taguchi
- 👤 Yoshiyuki Takishima
- 👤 Tadashi Ito
- 👤 Hiroshi Aizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:07
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; G03; G03B; G03B7/00; G06; G06G; G06G7/00; G06G7/12; G06G7/24; H; H03; H03F; H03F1/00; H03F1/30; H03F3/00; H03F3/04; H03F3/08; H03F3/087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
In a temperature compensating device wherein a semiconductor circuit has a signal input terminal and a bias terminal and wherein a signal output terminal, a signal source is connected to the signal input terminal and a bias voltage is impressed on said bias terminal and wherein said circuit includes a first temperature responsive semiconductor diode for adjusting an input signal from said signal source to a varying degree of adjustment according to the variation of temperature, wherein said temperature compensating device also includes a temperature compensating circuit which comprises a second temperature responsive semiconductor diode which lowers voltage as temperature varies and an output terminal which is connected to the bias terminal of said semiconductor circuit in such a manner that the voltage reduction by said second temperature responsive diode serves to minimize the variation of the output signal from the signal output terminal of said semiconductor circuit due to temperature variation, an improvement comprising: an electric current source for feeding said second temperature responsive semiconductor diode with an electric current i c which corresponds to the difference in operating characteristics between said first temperature responsive diode and said second diode and which is based on the following formula: ##EQU7##
Claim 2
Dependent Claim
200 words
In a temperature compensating device wherein a semiconductor circuit has a signal input terminal and a bias terminal and wherein a signal output terminal, a signal source is connected to the signal input terminal and a bias voltage is impressed on said bias terminal and wherein said circuit includes a first temperature responsive semiconductor diode for adjusting an input signal from said signal source to a varying degree of adjustment according to the variation of temperature, wherein said temperature compensating device also includes a temperature compensating circuit which comprises a second temperature responsive semiconductor diode which lowers voltage as temperature varies and an output terminal which is connected to the bias terminal of said semiconductor circuit in such a manner that the voltage reduction by said second temperature responsive diode serves to minimize the variation of the output signal from the signal output terminal of said semiconductor circuit due to temperature variation, an improvement comprising: an electric current source for feeding said second temperature responsive semiconductor diode with an electric current i c which corresponds to the difference in operating characteristics between said first temperature responsive diode and said second diode and which is based on the following formula: ##EQU7##
Claim 3
Dependent Claim
16 words
The temperature compensating device according to claim 1, wherein said signal source is a photovoltaic cell.
Claim 4
Dependent Claim
50 words
The temperature compensating device according to claim 2, wherein said temperature compensating device includes an element which has a positive temperature coefficient connected to the signal output terminal of said semiconductor circuit device for the purpose of stabilizing the operating characteristic of the semiconductor circuit device over a wide range.
Claim 5
Dependent Claim
21 words
The temperature compensating device according to claim 3, wherein said element having a positive temperature coefficient is composed of a resistor.
Claim 6
Dependent Claim
20 words
The temperature compensating device according to claim 4, wherein said resistor having a positive temperature coefficient is a copper winding.
Claim 7
Dependent Claim
35 words
The temperature compensating device according to claim 1, wherein in the case where ioc(T) = iop(T) said electric current source supplies electric current I c = i pM to said second temperature responsive semiconductor diode.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |