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Cooling Projection System for Passive Display

IP.com Disclosure Number: IPCOM000038626D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Cox, AR: AUTHOR [+6]

Abstract

In a projection system for a passive reflective display, a lamp supplies light through a condenser to the display module from which it is reflected for projection by a lens. These components, together with a fan and power supply, are enclosed in a housing with two air inlets. The fan draws air through the inlets in two streams to cool critical items (module and lens assembly; lamp housing) and then combines the two streams to cool, to some degree, the power supply before exiting from the housing. The condenser is totally enclosed in a barrel to avoid contamination. A thermal heat barrier prevents heat conduction between the condenser barrel and the lens assembly. Fig. 1 is a sketch of the cooling system with air flows shown by arrows.

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Cooling Projection System for Passive Display

In a projection system for a passive reflective display, a lamp supplies light through a condenser to the display module from which it is reflected for projection by a lens. These components, together with a fan and power supply, are enclosed in a housing with two air inlets. The fan draws air through the inlets in two streams to cool critical items (module and lens assembly; lamp housing) and then combines the two streams to cool, to some degree, the power supply before exiting from the housing. The condenser is totally enclosed in a barrel to avoid contamination. A thermal heat barrier prevents heat conduction between the condenser barrel and the lens assembly. Fig. 1 is a sketch of the cooling system with air flows shown by arrows. A small axial fan 7 is located between the lamp 9, the housing of condenser 6 and the power supply 8, 10 and draws air into the housing 11 in two streams through inlets 12 and 13. Air at ambient temperature from inlet 13 is used to cool display module 1 and lens 4 assembly which is thermally isolated from the lamp housing 9 and condenser 6 by thermal barrier 3. A suitable material for thermal barrier 3 is glass-filled polycarbonate. The lamp 9 is cooled by the air entering inlet 12 at the top of the housing, the two cooling air flows combining at the fan 7. The combined airflow is then used to cool the

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power supply 8, 10 before leaving the housing 11 through slots 14 in the lower front face of the housing. A deflection plate is fitted below fan 7 to deflect the ...