Projection type image display apparatus

Details Projection type image display apparatus Projection type image display apparatus

Filed on

2006-08-30

Date issued

2008-10-07

Examiner

Mahoney, Christopher E (Department: 2862)

Patent Class

Optical: systems and elements

SubClass

Projection screen

Type

Reexamination Certificate

Status

active

Patent number

07433121

Description

ABSTRACT:
A screen is hung from a screen frame with hanging members bonded to the upper side of a front sheet. Supporting members are disposed on the lower side of the front sheet and, by mounting a Fresnel lens sheet on the supporting members, a tension is given by its weight to the front sheet in the vertical direction. Further, a tension in the horizontal direction is given to the front sheet. Long holes are so formed in the hanging members that the hanging members on the right and left sides of the screen by expansion or contraction of the screen are made greater in the extent of shifting in the horizontal direction than the hanging member in the central part.

REFERENCES:
patent: 2001-154274 (2001-06-01), None

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