Transmission-type screen and image display device using the transmission-type screen

Patent metadata

Field	Value
Publication number	US-2016266283-A1
Application number	US-201615161686-A
Country	US
Kind code	A1
Filing date	May 23, 2016
Priority date	Jan 6, 2014
Publication date	Sep 15, 2016
Grant date	—

Abstract

A transmission-type screen includes: a first lens array surface on which a plurality of first microlenses are arrayed; and a second lens array surface that is provided at a distance in a direction perpendicular to the first lens array surface and on which a plurality of second microlenses whose shape is different from the shape of the first microlenses are arrayed. A level line near a vertex is circular or elliptical in the first microlenses, and a level line near a vertex is elliptical with ellipticity different from the ellipticity of the level line of the first microlenses in the second microlenses.

First claim

What is claimed is:

1 . A transmission-type screen comprising:
a first lens array surface on which a plurality of first microlenses are arrayed; and a second lens array surface that is provided at a distance in a direction perpendicular to the first lens array surface and on which a plurality of second microlenses whose shape is different from the shape of the first microlenses are arrayed; wherein a level line near a vertex is circular or elliptical in the first microlenses, and wherein a level line near a vertex is elliptical with ellipticity different from the ellipticity of the level line of the first microlenses in the second microlenses.

2 . The transmission-type screen according to claim 1 , comprising:
a first light diffusion plate that has the first lens array surface and a first flat surface that faces away from the first lens array surface; and a second light diffusion plate that has the second lens array surface and a second flat surface that faces away from the second lens array surface, wherein the second light diffusion plate is arranged such that the second lens array surface faces the first flat surface.

3 . The transmission-type screen according to claim 1 ,
wherein the transmission-type screen has a shape where the width thereof in an x-axis direction is longer than the width thereof in a y-axis direction in an orthogonal coordinate system where a direction perpendicular to the first lens array surface is set to be a z-axis direction, wherein the level line of the first microlenses is circular, and wherein the level line of the second microlenses is elliptical having a short axis in the x-axis direction and a long axis in the y-axis direction.

4 . The transmission-type screen according to claim 3 , configured such that light that enters the transmission-type screen enters the second lens array surface after entering the first lens array surface.

5 . The transmission-type screen according to claim 1 ,
wherein the distance between the first lens array surface and the second lens array surface is not less than 200 μm nor more than 400 μm.

6 . An image display device comprising:
an image projection unit that projects image display light; an intermediate image formation unit that forms a real image that is based on the image display light projected from the image projection unit; and a projection mirror that reflects, toward a virtual image presenting surface, the image display light that has passed through the intermediate image formation unit; wherein the intermediate image formation unit includes: a first lens array surface on which a plurality of first microlenses are arrayed; and a second lens array surface that is provided at a distance in a direction perpendicular to the first lens array surface and on which a plurality of second microlenses whose shape is different from the shape of the first microlenses are arrayed, wherein a level line near a vertex is circular or elliptical in the first microlenses, and wherein a level line near a vertex is elliptical with ellipticity different from the ellipticity of the level line of the first microlenses in the second microlenses.

Assignees

• Jvc Kenwood Corp

Inventors

• Segawa Masaru

Classifications

• H04N9/315

  Modulator illumination systems (general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20) · CPC title

• G03B21/62

  Translucent screens · CPC title

• G02B3/0062 Primary

  Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between · CPC title

• G03B21/006

  using LCD's · CPC title

• G02B2027/0118

  comprising devices for improving the contrast of the display / brillance control visibility · CPC title