JP2015223462A5

JP2015223462A5 -

Info

Publication number: JP2015223462A5
Application number: JP2014111994A
Authority: JP
Filing date: 2014-05-30
Publication date: 2017-03-02
Anticipated expiration: 2034-05-30

Description

一方、光ファイバを束ねたバンドルファイバであるライトガイドの許容開口数ＮＡ_Ｌは、光ファイバのコア部の屈折率をｎ_１とし、クラッド部の屈折率をｎ_２としたときに、以下の式１０４で与えられ、一般的なライトガイドの許容開口数ＮＡ_Ｌは、０．５６≦ＮＡ_Ｌ≦０．８８の範囲にある。
On the other hand, the allowable numerical aperture NA _L of the light guide is a bundle fiber that bundles the optical fibers, the refractive index of the core portion of the optical fiber and n _1, the refractive index of the cladding portion is taken as n _2, the following formula 104, the allowable numerical aperture NA _L of a general light guide is in the range of 0.56 ≦ NA _L ≦ 0.88.

ここで、照明装置２が装着される内視鏡ユニット９００については特に限定されるものではなく、一般的なライトガイド９０１を備えた内視鏡ユニット９００であれば、任意のものが利用可能である。
Here, the endoscope unit 900 to which the lighting device 2 is attached is not particularly limited, and any endoscope unit 900 including a general light guide 901 can be used. is there.

また、内視鏡の先端部まで照明装置２の光ファイバ２２０を延伸し、拡散部材２４０を設置することで２次光源からの照明光で観察野に照明してもよい。
Alternatively, the observation field may be illuminated with illumination light from the secondary light source by extending the optical fiber 220 of the illumination device 2 to the distal end portion of the endoscope and installing the diffusion member 240.

以上、図２５を参照しながら、本実施形態に係る照明装置３の構成について、詳細に説明した。
The configuration of the illumination device 3 according to this embodiment has been described in detail above with reference to FIG.

ここで、照明装置３が装着される内視鏡ユニット９００については特に限定されるものではなく、一般的なライトガイド９０１を備えた内視鏡ユニット９００であれば、任意のものが利用可能である。逆に、特定のライトガイド９０１を有する内視鏡ユニット９００を利用したい場合には、ライトガイド９０１の許容入射開口数ＮＡ_Ｌに応じて、本実施形態に係る照明装置３の２次光源の像の大きさＹ’や、コンデンサ光学系３５０の近軸横倍率βを設定すればよい。
Here, the endoscope unit 900 to which the illumination device 3 is mounted is not particularly limited, and any endoscope unit 900 including a general light guide 901 can be used. is there. Conversely, if you want to use the endoscope unit 900 having a certain light guide 901, in response to the allowable incident numerical aperture NA _L of the light guide 901, the secondary light source image of the illumination device 3 according to this embodiment Y ′ and the paraxial lateral magnification β of the condenser optical system 350 may be set.

Claims

At least one laser light source for emitting laser light;
A coupling optical system for coupling the laser light emitted from the laser light source to an optical fiber;
A collimating optical system that collimates the laser light emitted from the optical fiber;
A diffusing member that is disposed near the rear focal position of the collimating optical system and generates a secondary light source by diffusing the parallel light flux;
A condenser optical system that forms an image of the secondary light source at a light guide incident end with a predetermined paraxial lateral magnification;
A lighting device.

When the size of the image of the secondary light source imaged on the incident end of the light guide by the condenser optical system is Y ′ and the diameter of the incident end of the light guide is φ _LG , The lighting device according to claim 1, wherein the represented relationship is established.

0.8 ≦ Y ′ / φ _LG ≦ 1.2 (Formula 1)

The paraxial lateral magnification of the condenser optical system is 0.4 to 2.3, the lighting device according to claim 1 or 2.

Y ′ = φ _LG where Y ′ is the size of the image of the secondary light source formed on the incident end of the light guide by the condenser optical system, and φ _LG is the diameter of the incident end of the light guide. relationship is established, the lighting device according to claim 2 or 3.

A plurality of the laser light sources are provided;
Wherein the coupling optical system, between each of said laser light source the laser beam emitted from, has a numerical aperture adjustment unit for aligning the incident numerical aperture to the optical fiber, according to any one of claims 1-4 Lighting equipment.

The numerical aperture adjuster is
Having at least a dichroic mirror or a dichroic prism,
6. The incident numerical aperture is adjusted according to an incident position of the laser beam on the dichroic mirror or dichroic prism or an arrangement position of the dichroic mirror or dichroic prism with respect to a central optical axis of the coupling optical system. Lighting equipment.

At least one of the laser beam transmitted through the coupling optical system, the incident end face of the optical fiber, is incident from an oblique direction with respect to the normal line of the incident end face, according to any one of claims 1 to 6 Lighting equipment.

A plurality of the laser light sources are provided;
In at least one of the laser light sources, when the size of the secondary light source imaged on the incident end of the light guide by the condenser optical system is Y ′ and the diameter of the incident end of the light guide is φ _LG The relationship represented by the following formula 1 is established,

0.8 ≦ Y ′ / φ _LG ≦ 1.2 (Formula 1)

In a laser light source other than the at least one laser light source, the coupling optical system includes a numerical aperture adjustment unit that aligns the numerical apertures incident on the optical fiber between the laser beams emitted from the laser light sources. The illumination device according to any one of claims 1 to 7 .

The condenser optical system, the surface on the side where the secondary light source is formed, and the surface where the image of the secondary light source is formed is made of a lens system is a plan, respectively, one of the claims 1-8 1 The lighting device according to item .

The condenser optical system includes, in order from the diffusion member side, a positive plano-convex lens having a plane directed toward the diffusion member side, one or more positive lenses, and a positive surface having the plane directed toward the rear stage side of the condenser optical system. The illumination device according to claim 9, comprising: a plano-convex lens.

The illumination device according to claim 9, wherein a surface of the plano-convex lens located closest to the side where the secondary light source is formed in the condenser optical system is an aspherical surface.

The illumination device according to any one of claims 1 to 11, wherein the laser light source is at least one of a semiconductor laser and a solid-state laser.

The illumination device according to any one of claims 1 to 12, wherein the diffusion member is a holographic diffusion plate or a microlens array on which a holographic pattern is applied.

Coupling laser light emitted from at least one laser light source to an optical fiber via a coupling optical system;
Making the laser light emitted from the optical fiber into a parallel light beam by a collimating optical system;
Generating a secondary light source by diffusing the parallel luminous flux with a diffusing member provided in the vicinity of a rear focal position of the collimating optical system;
Forming an image of the secondary light source at the incident end of the light guide at a predetermined paraxial lateral magnification;
Including a lighting method.

At least one laser light source that emits laser light; a coupling optical system that couples the laser light emitted from the laser light source to an optical fiber; a collimating optical system that uses the laser light emitted from the optical fiber as a parallel beam; A diffusing member disposed near the rear focal position of the collimating optical system and generating a secondary light source by diffusing the parallel light beam, and an image of the secondary light source with a predetermined paraxial lateral magnification of a light guide An illumination device having a condenser optical system that forms an image at the incident end;
A light guide into which laser light emitted from the illumination device is incident;
An endoscope comprising: