PROJECTION TYPE VIDEO DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a projection type video display device in which reduction in a projection distance (a wider angle) and miniaturization of a projection optical system are achieved.

SOLUTION: A projection optical system 1 comprises: a lens group 10 which is arranged in a traveling direction of light relative to an image display element 8 and includes a plurality of lenses; a first lens 11 which is arranged in the traveling direction of light relative to the lens group 10; a second lens 12 which is arranged in the traveling direction of light relative to the first lens; and a mirror 13 which reflects light emitted from the second lens 12 and projects the light onto a screen at an angle. A lens 100 closest to the first lens 11 of the lens group 10 is a meniscus lens with a convex surface facing in the first lens 11 direction, the first lens 11 is a meniscus lens with a convex surface facing in the second lens 12 direction, and the second lens 12 is a meniscus lens with a convex surface facing in the mirror 13 direction.

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