PROJECTION OPTICAL SYSTEM AND PROJECTION TYPE DISPLAY DEVICE
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United States of America Patent
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Issued Date -
Aug 8, 2024
app pub date -
Jan 8, 2024
filing date -
Jan 30, 2023
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status (Latency Note)
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Abstract
The projection optical system projects an image, which is displayed on a display surface of a display element on a reduction side, to a projection surface on a magnification side, does not include a reflecting surface having a power, and includes at least one optical path deflection surface, which deflects an optical path by 90 degrees, in the optical path. Assuming that a sum of thicknesses of all optical elements on an optical axis included in a range from a lens surface closest to the magnification side in the projection optical system to a lens surface closest to the reduction side in the projection optical system is ΣTHe, a height of a maximum effective ray on the display surface from the optical axis is Imax, and a focal length of the projection optical system is f, the projection optical system satisfies ΣTHe<70 mm and 1.7
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