Patent ID: 11960103
Assignee: DEXERIALS CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. A projection type image display device comprising:
a light source;
a first diffusion plate;
a second diffusion plate; and
a screen;
wherein the first diffusion plate and the second diffusion plate are arranged in series between the light source and the screen on an optical path from the light source to the screen,
both the first diffusion plate and the second diffusion plate have a micro-lens array,
the micro-lens array has a plurality of micro lenses arranged in a matrix in a plan view,
each of the plurality of micro-lenses has four main sides in a plan view,
each of the four main sides is inclined with respect to a row virtual line parallel to a row direction or a column virtual line parallel to a column direction, and
the degree of variation of the intervals between the row virtual lines and between the column virtual lines, the positions of the vertices of the respective micro-lenses, and the radii of curvature of the respective micro-lenses with respect to a basic pattern is between 5% and 40%, respectively.