Abstract: The micro-lens array is a micro-lens array in which a plurality of micro-lenses are arranged in a matrix in a plan view, wherein each of the plurality of micro-lenses has four main sides in a plan view, and 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.

Abstract: To reduce unevenness in a luminance distribution in two directions of microlenses disposed in a form of a rectangular grid to improve uniformity of light distribution. Provided is a diffuser plate of a microlens array type including a base material, and a microlens array composed of a plurality of microlenses disposed on an X-Y plane on at least one surface of the base material using a rectangular grid as a reference, in which grid intervals Wx in an X direction of the microlenses disposed in the X direction of the rectangular grid are different from each other, grid intervals Wy in a Y direction of the microlenses disposed in the Y direction of the rectangular grid are different from each other, and surface shapes of the plurality of microlenses are different from each other.

Abstract: Spectral noise produced by a diffraction phenomenon of a periodic structure can be reduced to improve homogeneity of intensity of straight diffusion light, and noise of zero-order diffraction light is reduced to improve light distribution properties as well. A diffusion plate 1 of a microlens array type that emits straight diffusion light includes a base material 10, and a plurality of cylindrical lenses 21 arranged in an X direction on an X-Y plane of the base material 10 and composed of elongated convex portions or elongated concave portions extending in a Y direction.

Abstract: The optical system includes: a coherent light source; and a fixed diffusion plate and a relative movement diffusion plate which intersect with a traveling direction of light emitted from the coherent light source, wherein the fixed diffusion plate emits a light having a rectangular shape from an incident light, and wherein, in the relative movement diffusion plate, a diffusion surface of the light moves relative to the incident light.

Abstract: Provided is a laser device, comprising a laser light source, a collimating lens that collimates the light output from the laser light source, and a diffuser plate that diffuses the light from the laser light source before collimating the light.

Abstract: Provided is a laser device, comprising a laser light source, a collimating lens that collimates the light output from the laser light source, and a diffuser plate that diffuses the light from the laser light source before collimating the light.

Abstract: The micro-lens array is a micro-lens array in which a plurality of micro-lenses are arranged in a matrix in a plan view, wherein each of the plurality of micro-lenses has four main sides in a plan view, and 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.