Diffusion plate

A diffusion plate and diffusion characteristic technology, applied in the field of diffusion plate, can solve the problems of uneven color, uneven brightness, etc., and achieve the effect of less uneven color, less uneven brightness, and simple structure

Active Publication Date: 2017-12-01
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of using only one microlens array, it is easy to produce uneven brightness and uneven color

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0047] (shape of diffuser plate)

[0048] figure 1 It is a figure which shows the cross-sectional profile of the diffuser plate 1 of this embodiment in the cross-section perpendicular|vertical to the main surface S1. like figure 1As shown, the diffusion plate 1 is a light diffusion plate in which a plurality of microlenses 2 are arranged on the main surface S1 of the substrate. The plurality of microlenses 2 are arranged in a grid on the principal surface S1. figure 1 The vertical axis of represents the height of the main surface S1 of the lens shape with the height of the main surface S1 of the substrate being 0. figure 1 The horizontal axis of represents the position parallel to the direction of the main surface S1. Moreover, the optical axis of the microlens array which consists of several microlenses 2 faces the direction perpendicular to main surface S1. ...

Embodiment

[0115] Hereinafter, based on the example of the diffuser plate 1 of this embodiment, this invention is demonstrated in more detail.

[0116] In the diffuser plate 1 of this embodiment, as described above, the microlens array including the plurality of microlenses 2 on the main surface S1 is designed by dividing the phase modulation shape 4 and the plurality of reference microlenses 3 .

[0117] Across the entire microlens array, a phase modulation shape 4 is set. In the phase modulation shape 4, the maximum height difference from the main surface S1 for imparting a phase difference is ΔH=1.5 μm. On the main surface S1, uniform random numbers corresponding to the respective positions of the plurality of microlenses 2 are generated, and a raised height (raised portion) for imparting a phase difference is set. However, when a different raised height is set only for each microlens 2 among the plurality of microlenses 2 , the phase difference between adjacent microlenses 2 becomes...

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Abstract

A diffusion plate (1) according to the present invention is characterized by having a plurality of fine structures (microlenses (2)) each having at least two lens functions arranged on the principle surface (S1) thereof, and enabling diffused light within a desired diffusion angle range to have substantially uniform intensity, wherein when the average pitch of the fine structures is P and the standard deviation of relative luminance of the fine structures in the respective front surface directions is Sk, P<=200 [mu]m, Sk >= 0.005, and P * P * Sk <= 400 [mu]m2 are satisfied. Accordingly, the present invention can provide a diffusion plate having a simple configuration which exhibits optical properties of low luminance unevenness and low color unevenness, and also exhibits favorable exterior appearance quality at a time of image projection.

Description

technical field [0001] The invention relates to a diffuser plate. Background technique [0002] Diffusion plates using microlens arrays are used as screens for head-up displays, laser projectors, and the like. Compared with the case of using a diffuser such as a translucent plate or ground glass, the use of a microlens array has the advantage that speckle noise of laser light can be suppressed. [0003] Patent Document 1 describes an image forming apparatus having a diffuser plate using a laser projector and a microlens array formed by arranging a plurality of microlenses. The laser projector uses laser light as a light source to The image formed by the arrangement of multiple pixels is projected. When a microlens array is used, incident light can be appropriately diffused, and a desired diffusion angle can be freely designed. [0004] In Patent Document 2, Patent Document 3, and Non-Patent Document 1, screens using two microlens arrays are described. In the case where o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02B3/00G02B27/01
CPCG02B5/0221G02B27/0101G02B27/48G02B5/0215G02B5/0284G02B5/0278G02B3/0056G02B3/0006G02B5/021G02B27/01G02B5/02G02B3/00G02B3/0043G02B2027/013
Inventor 内田厚唐井贤渡边淳史
Owner KURARAY CO LTD
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