JPWO2020152688A5

JPWO2020152688A5 -

Info

Publication number: JPWO2020152688A5
Application number: JP2020506787A
Authority: JP
Publication date: 2023-10-31
Anticipated expiration: 2040-01-26

Description

本発明の実施形態のさらなる特徴によれば、少なくとも部分的に反射する表面の第３のセットが、連続的に増加する反射率の第１のシーケンスを、画像照明がその少なくとも部分的に反射する表面に到達する順序で有し、部分反射表面の第１のセットが、連続的に増加する反射率の第２のシーケンスを、画像照明がその部分反射表面に到達する順序で有し、第２のシーケンスが、第１のシーケンスの最後の反射率よりも小さい反射率で始まる。

According to further features in embodiments of the invention, the third set of at least partially reflective surfaces causes the image illumination to at least partially reflect the first sequence of successively increasing reflectances. a first set of partially reflective surfaces having a second sequence of successively increasing reflectances in order of image illumination reaching the partially reflective surfaces ; sequence starts with a lower reflectance than the last reflectance of the first sequence.

光学開口にわたって比較的均一な画像照明強度を提供するために、部分反射表面のセットの１つ以上、そして好ましくは各セットが、連続的に増加する反射率のシーケンスを、画像照明がその部分反射表面に到達する順序で有していることが、最も好ましい。例として、導波管領域（２００）については、３３％、５０％および１００％の反射率を有する３つのファセットのシーケンスは、連続する各面からの入射照明の凡そ１／３を反射するのに有効である。同様に４つのファセットのシーケンスについて、２５％、３３％、５０％および１００％の値は、各面からの入射照明の凡そ１／４を反射するのに有効である。観察者がそれを通して外部シーンを観察する視認領域内にあるファセットについては、反射率の値はより低く、また、ファセット間の比例的な増加はより小さいが、伝播する画像照明内に残る照明の強度のより低い割合を補うための増加シーケンスという、根本的な概念は、同じままである。（連続するファセットの理想的な反射率値が比較的近い場合、ＬＯＥの領域内の２つ以上の連続するファセットは、製造の簡略化として、同じ反射率値を実装し得るが、シーケンスは均一性を向上させる上記の効果を提供するために単調に増加しているため、シーケンスは依然として「連続的に増加している」と称される。）したがって、例えば、ファセット（２０４）は、連続的に増加する反射率の第２のシーケンスを、画像照明がそのファセットに到達する順序で有し、その状態では、第２のシーケンスは、（ファセット（２０４）の）第１のシーケンスの最後の反射率よりも小さい反射率から開始する。
In order to provide a relatively uniform image illumination intensity across the optical aperture, one or more of the sets of partially reflective surfaces, and preferably each set, has a sequence of successively increasing reflectances such that the image illumination has its partially reflective surface . It is most preferred to have them in the order that they reach the surface . As an example, for a waveguide region (200), a sequence of three facets with reflectivities of 33%, 50% and 100% reflects approximately 1/3 of the incident illumination from each successive facet. It is effective for Similarly for a sequence of four facets, values of 25%, 33%, 50% and 100% are effective to reflect approximately 1/4 of the incident illumination from each facet. For facets that are within the viewing area through which the observer observes the external scene, the reflectance values are lower, and the proportional increase between facets is smaller, but the proportion of the illumination remaining in the propagating image illumination is lower. The fundamental concept remains the same: an increasing sequence to compensate for a lower percentage of intensity. (If the ideal reflectance values of consecutive facets are relatively close, then two or more consecutive facets within the region of the LOE may implement the same reflectance value as a manufacturing simplification, but the sequence is uniform) (The sequence is still referred to as "successively increasing" because it increases monotonically to provide the above effect of increasing the in the order in which the image illumination reaches that facet , in which case the second sequence has a second sequence of reflectances that increases to Start with a reflectance that is less than the reflectance.

Claims

An optical system for directing image illumination injected at a coupling-in region towards a user for viewing, the optical system comprising a light guiding optical element (LOE) formed from a transparent material; The LOE is
(a) a first region comprising a first set of planar, mutually parallel partially reflective surfaces having a first orientation;
(b) a second region comprising a second set of planar, mutually parallel partially reflective surfaces having a second orientation that is not parallel to the first orientation;
(c) one set of mutually parallel major exterior surfaces, said major exterior surfaces being such that said first set of partially reflective surfaces and said second set of partially reflective surfaces are both said major exterior surfaces; extending across the first region and the second region so as to be located between;
The second set of partially reflective surfaces are obliquely inclined with respect to the major external surface, so that the LOE A portion of the image illumination propagating in the LOE is adapted to be coupled out from the LOE towards the user, and the first set of partially reflective surfaces is arranged to couple out the main external light from the coupling-in area. a portion of image illumination propagating within the LOE by internal reflection at a surface is oriented to be deflected toward the second region;
The optical system includes a third planar, mutually parallel, at least partially reflective surface integrated as part of the LOE in the coupling-in region and located between the main external surfaces. further comprising a third set of at least partially reflective surfaces arranged to receive image illumination injected into the LOE from a projector for propagation by internal reflection at the major external surface. , the projector injects the image illumination with an optical aperture having a first width measured parallel to the major external surface, and the third set of at least partially reflective surfaces is configured to propagating the image illumination by internal reflection at the major external surface, via reflection of at least a portion of the image illumination on a third set of partially reflective facets, parallel to the major external surface; redirecting the first set of partially reflective surfaces with an effective optical aperture having a measured second width, the second width being greater than the first width; An optical system featuring:

the third set of at least partially reflective surfaces has a first sequence of successively increasing reflectances in the order in which the image illumination reaches the at least partially reflective surfaces ; A first set of partially reflective surfaces has a second sequence of successively increasing reflectances in the order in which the image illumination reaches the partially reflective surfaces , and the second sequence differs from the first 2. The optical system of claim 1, starting with a reflectance smaller than the last reflectance of the sequence.

3. The optical system of claim 2, wherein the last reflectance of the first sequence of successively increasing reflectances is greater than 90%.

2. The optical system of claim 1, wherein a majority of the image illumination directed towards the first set of partially reflective surfaces receives exactly one reflection from the third set of at least partially reflective surfaces. system.

The optical system of claim 1, wherein a majority of the image illumination directed toward the first set of partially reflective surfaces receives two reflections from the third set of at least partially reflective surfaces. .

2. The optical system of claim 1, wherein the third set of at least partially reflective surfaces is parallel to the first set of partially reflective surfaces.

2. The optical system of claim 1, wherein the third set of at least partially reflective surfaces is not parallel to the first set of partially reflective surfaces.

2. The optical system of claim 1, wherein the mutual surface spacing of the third set of at least partially reflective surfaces is less than the mutual surface spacing of the first set of partially reflective surfaces.

5. Each at least partially reflective surface of the third set of at least partially reflective surfaces has a surface area that is less than the surface area of each partially reflective surface of the first set of partially reflective surfaces. The optical system according to item 1.

The optical system of claim 1, wherein the first region and the second region are non-overlapping.