Package for a temperature-sensitive optical component with inner

Details Package for a temperature-sensitive optical component with inner Package for a temperature-sensitive optical component with inner

1997-12-04

1999-07-06

Jeffery, John A.

Electric heating

Heating devices

Combined with diverse-type art device

219385, H05B 300

Patent

active

059193832

ABSTRACT:
A package for a temperature sensitive optical component (20) includes inner (14) and outer (12) containers of low thermal conductivity plastics material, a foam insulation (18) being situated between the two containers. Within the inner container (14) are a thermally conductive plate to which the component (20), a temperature sensitive resistor, and a resistive heating element are affixed. A temperature compensating circuit (16) is located outside the inner container. The temperature sensitive resistor is part of a Wheatstone bridge at the input of the circuit (16), whereby the circuit compensates for variations in operating voltage. The output transistor of the circuit regulates the current through the resistive heating element in response to variations in the resistance of the temperature sensitive resistor. This transistor extends into the inner container (14) and is in contact with the thermally conductive plate, whereby heat from the transistor is dissipated into the plate. This maintains the temperature of the transistor substantially constant.

REFERENCES:
patent: 3028473 (1962-04-01), Dyer et al.
patent: 3237173 (1966-02-01), Chamberlain et al.
patent: 3662150 (1972-05-01), Hartung
patent: 3838248 (1974-09-01), Uchida et al.
patent: 3883715 (1975-05-01), Gebo
patent: 3962559 (1976-06-01), Drda et al.
patent: 4216371 (1980-08-01), Marotel
patent: 5530408 (1996-06-01), Vig et al.
patent: 5729181 (1998-03-01), Cutler et al.

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