JP2015184401A5

JP2015184401A5 -

Info

Publication number: JP2015184401A5
Application number: JP2014059531A
Authority: JP
Filing date: 2014-03-24
Publication date: 2017-04-27
Anticipated expiration: 2034-03-24

Description

即ち、マイクロレンズ１１２の略厚みである一方の面の端部から他方の面の光軸上点までの距離ｌとマイクロレンズ１１２の口径の大きさである距離ｈの関係において、
ｌ>ｈ√（４ｎ ² −１）（式１）
を満たすようにしている。
That is, in the relationship between the distance l from the end of one surface, which is substantially the thickness of the microlens 112, to the point on the optical axis of the other surface, and the distance h, which is the size of the aperture of the microlens 112,
l> h√ (4n ² −1) (Formula 1)
To meet.

また、出射面における入射角θと出射角θ'とは、レンズの硝材の屈折率をｎとすると、
ｎ・ｓｉｎθ＝ｓｉｎθ' （式３）
で表されることになる。
更に、θ'は最大角が３０度あるため、
０．５>ｓｉｎθ' （式３）
となる。
Further, the incident angle θ and the exit angle θ ′ on the exit surface are expressed as follows:
n · sin θ = sin θ ′ (Formula 3)
It will be represented by
Furthermore, since θ ′ has a maximum angle of 30 degrees,
0.5> sin θ ′ (Formula 3)
It becomes.

従って、
０．５>ｓｉｎθ'＝ｎ・ｓｉｎθ＝ｎ・ｈ／√（ｈ²＋ｌ²）（式４）
となり、ｌとｈとの関係は（式１）で表され、レンズの厚さｌが、入射面の口径２ｈとの関係において、ｈ√（４ｎ²−１）よりも大きいとき、各マイクロレンズ１１２からの出射光における光軸からの傾きを３０度以内とすることができる。
Therefore,
0.5> sin θ ′ = n · sin θ = n · h / √ (h ² + l ² ) (Formula 4)
The relationship between l and h is expressed by (Equation 1). When the lens thickness l is larger than h√ (4n ² −1) in relation to the aperture 2h of the incident surface, each microlens The inclination of the emitted light from 112 from the optical axis can be within 30 degrees.

以下に、本願出願の最初の特許請求の範囲に記載された発明を付記する。
［１］光源と、
前記光源から出射された光を均一化するマイクロレンズアレイと、
このマイクロレンズアレイを透過した光を屈折させる照明光学系と、
を備え、
前記照明光学系は、２枚の凸レンズの間に１枚の凹レンズが配置されている３枚のレンズを含むことを特徴とする光源光学装置。
［２］前記マイクロレンズアレイの各マイクロレンズは、入射面の焦点及び出射面の焦点が、それぞれ前記出射面付近及び前記入射面付近にある凸レンズであることを特徴とする前記［１］に記載の光源光学装置。
［３］前記各マイクロレンズは、入射面の有効部端部から出射面の光軸上点までの光軸に沿った距離をｌとし、入射面の光軸上点から入射面の有効部端部までの最大距離をｈとし、硝材の屈折率をｎとするとき、
ｌ>ｈ√（４ｎ ² −1）（式１）
を満足することを特徴とする前記［２］に記載の光源光学装置。
［４］前記マイクロレンズアレイの前記各マイクロレンズは、表示素子の矩形と相似形状とされていることを特徴とする前記［１］乃至前記［３］の何れかに記載の光源光学装置。
［５］前記３枚のレンズの内の前記マイクロレンズアレイから最も離れたレンズは、光軸がシフトされていることを特徴とする前記［１］乃至前記［４］の何れかに記載の光源光学装置。
［６］前記光源は、赤色波長帯域光を出射する半導体発光素子と、緑色波長帯域光を出射する半導体発光素子と、青色波長帯域光を出射する半導体発光素子と、を含むことを特徴とする前記［１］乃至前記［５］の何れかに記載の光源光学装置。
［７］前記光源は、赤色波長帯域光を出射する半導体発光素子と、青色波長帯域光を出射する半導体発光素子と、励起光源及び緑色蛍光体による緑色波長帯域光を出射する発光手段と、を含むことを特徴とする前記［１］乃至前記［５］の何れかに記載の光源光学装置。
何れかに記載の光源光学装置。
［８］前記［１］乃至前記［７］の何れか記載の光源光学装置と、
前記光源光学装置からの出射光が照射されて投影光を生成する表示素子と、
前記表示素子で形成された画像光をスクリーンに投影する投影光学系と、
前記表示素子や前記光源光学装置の制御を行うプロジェクタ制御手段と、
を有することを特徴とするプロジェクタ。
The invention described in the first claim of the present application will be appended below.
[1] a light source;
A microlens array for uniformizing the light emitted from the light source;
An illumination optical system that refracts light transmitted through the microlens array;
With
The illumination optical system includes a light source optical device including three lenses in which one concave lens is disposed between two convex lenses.
[2] Each microlens of the microlens array is a convex lens in which the focal point of the incident surface and the focal point of the emission surface are in the vicinity of the emission surface and the vicinity of the incident surface, respectively. Light source optical device.
[3] In each microlens, a distance along the optical axis from the effective portion end of the incident surface to the point on the optical axis of the output surface is set to l, and the effective portion end of the incident surface from the point on the optical axis of the incident surface. When the maximum distance to the part is h and the refractive index of the glass material is n,
l> h√ (4n ² −1) (Formula 1)
The light source optical device according to [2], wherein:
[4] The light source optical device according to any one of [1] to [3], wherein each of the microlenses of the microlens array has a shape similar to a rectangle of the display element.
[5] The light source according to any one of [1] to [4], wherein a lens farthest from the microlens array among the three lenses has an optical axis shifted. Optical device.
[6] The light source includes a semiconductor light emitting element that emits red wavelength band light, a semiconductor light emitting element that emits green wavelength band light, and a semiconductor light emitting element that emits blue wavelength band light. The light source optical device according to any one of [1] to [5].
[7] The light source includes: a semiconductor light emitting element that emits red wavelength band light; a semiconductor light emitting element that emits blue wavelength band light; and a light emitting unit that emits green wavelength band light from an excitation light source and a green phosphor. The light source optical device according to any one of [1] to [5], including:
The light source optical device according to any one of the above.
[8] The light source optical device according to any one of [1] to [7],
A display element that emits light emitted from the light source optical device to generate projection light;
A projection optical system that projects image light formed by the display element onto a screen;
Projector control means for controlling the display element and the light source optical device;
A projector comprising:

Claims

A light source;
A microlens array for uniformizing the light emitted from the light source;
An illumination optical system that refracts light transmitted through the microlens array;
With
The illumination optical system includes a light source optical device including three lenses in which one concave lens is disposed between two convex lenses.

2. The light source optical device according to claim 1, wherein each microlens of the microlens array is a convex lens having a focal point of an incident surface and a focal point of an output surface in the vicinity of the output surface and in the vicinity of the incident surface, respectively. .

Each of the microlenses has a distance along the optical axis from the end of the effective portion of the entrance surface to the point on the optical axis of the exit surface, and is from the point on the optical axis of the entrance surface to the end of the effective portion of the entrance surface. When the maximum distance is h and the refractive index of the glass material is n,
l> h√ (4n ² −1) (Formula 1)
The light source optical device according to claim 2, wherein:

4. The light source optical device according to claim 1, wherein each of the microlenses of the microlens array has a shape similar to a rectangle of a display element. 5.

5. The light source optical device according to claim 1, wherein an optical axis of a lens farthest from the microlens array among the three lenses is shifted.

The light source includes a semiconductor light emitting element that emits red wavelength band light, a semiconductor light emitting element that emits green wavelength band light, and a semiconductor light emitting element that emits blue wavelength band light. The light source optical device according to claim 5.

The light source includes a semiconductor light emitting element that emits red wavelength band light, a semiconductor light emitting element that emits blue wavelength band light, and a light emitting unit that emits green wavelength band light by an excitation light source and a green phosphor. 6. The light source optical device according to claim 1, wherein the light source optical device is a light source optical device.

A light source optical device according to any one of claims 1 to 7,
A display element that emits light emitted from the light source optical device to generate projection light;
A projection optical system that projects image light formed by the display element onto a screen;
Projector control means for controlling the display element and the light source optical device;
A projector comprising: