Projection type video display apparatus

Details Projection type video display apparatus Projection type video display apparatus

2011-08-16

2011-08-16

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Temperature control

C353S037000, C353S058000, C353S055000, C353S056000, C353S119000, C353S060000, C353S122000, C362S285000, C362S287000, C362S345000, C362S373000, C362S294000, C362S060000, C362S060000, C362S086000, C348S789000, C348S086000, C349S161000

Reexamination Certificate

active

07997736

ABSTRACT:
A projector comprises: a cooling fan for sucking ambient air through a filter; switching means for switching the operational mode of the cooling fan between a lowland mode and a highland mode; and control means adapted to obtain current fan voltage to determine the normal rpm value for that current fan voltage in reference to a highland voltage-rpm characteristic when the switching means is in the highland mode, obtain current fan rpm, and enables alarming means to issue a filter clogging alarm in the event that the current fan rpm is larger than the normal rpm value plus a predetermined value. Thus, filter clogging can be detected with precision in highlands.

REFERENCES:
patent: 6111630 (2000-08-01), Watanuki et al.
patent: 6837583 (2005-01-01), Gishi et al.
patent: 7484852 (2009-02-01), Kuraie
patent: 7527680 (2009-05-01), Horiguchi et al.
patent: 7654697 (2010-02-01), Yoshimura et al.
patent: 2010/0141853 (2010-06-01), Yuyama et al.
patent: 2000-153121 (2000-06-01), None

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