G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/00 (2006.01) H04N 9/31 (2006.01)
Patent
CA 2161840
A projection type image display apparatus using a small light valve, particularly a liquid crystal light valve, to achieve high brightness, a sharp contrast and excellent uniformity in image displaying. The apparatus includes a light source with a light emitting area, an oval mirror to reflect the light from the light source and a light valve to control the reflected light. The oval mirror possesses two focal points, a first focal point located on one side of the light valve near the oval mirror and a second focal point located on the opposite side of the light valve. The light emitting area is situated at a position so as to include the first focal point of the oval mirror. When the distance, from the first focal point to the light valve which governs the effective light flux area of the light valve is defined as 'L' and the distance from the first focal point to the second focal point is defined as '2C', the relationship between 'L' and 'C' satisfies the following inequality : 0.6 (L/C) 1.1 .
Fetherstonhaugh & Co.
Matsushita Electric Industrial Co. Ltd.
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