CN204116693U - A kind of illuminator that is used for disappears yellow circle and macula lutea low-angle light-distribution lens group - Google Patents

Abstract

The utility model provides and a kind of to disappear yellow circle and macula lutea low-angle light-distribution lens group for illuminator, and comprise lens I and lens II, described lens I and lens II plane of incidence are plane, and exit facet is curved surface; The plane of lens I is relative with the curved surface of lens II, and described lens I and lens II are placed with optical axis; H ₁with H ' ₁lens I object space principal point and image space principal point, H ₂with H ' ₂lens II object space principal point and image space principal point; Wherein, lens I image space principal point H ' ₁with lens II object space principal point H ₂between distance be the half of the image space focal length of lens I and the image space focal length sum of lens II, light source emitted light mixes at shadow surface after two lens outgoing, thus eliminate the problem that the shadow surface caused by form luminous intensity distributions such as simple lenses has yellow circle and macula lutea, realize the consistance of institute's shadow surface light colour temperature.

Description

A kind of illuminator that is used for disappears yellow circle and macula lutea low-angle light-distribution lens group

Technical field

The utility model belongs to optical technical field, particularly relates to a kind of to disappear yellow circle and macula lutea low-angle light-distribution lens group for illuminator.

Background technology

Prior art, the simple lens applying single optical material can not eliminate Huang circle and the macula lutea of light field periphery, or single lens inside surface or outside surface do microstructure process etc. and well can not eliminate yellow circle and macula lutea.

Utility model content

The purpose of this utility model is to provide a kind of and disappears yellow circle and macula lutea low-angle light-distribution lens group for illuminator, and the simple lens being intended to solve single optical material can not eliminate the Huang circle of light field periphery and the problem of macula lutea.

The utility model is achieved in that and a kind of disappears yellow circle and macula lutea low-angle light-distribution lens group for illuminator, and comprise lens I and lens II, described lens I and lens II plane of incidence are plane, and exit facet is curved surface, is namely all plano-convex lens; The plane of lens I is relative with the curved surface of lens II, and described lens I and lens II are placed with optical axis; H ₁with H ' ₁lens I object space principal point and image space principal point, H ₂with H ' ₂lens II object space principal point and image space principal point; Wherein, lens I image space principal point H ' ₁with lens II object space principal point H ₂between distance be the half of the image space focal length of lens I and the image space focal length sum of lens II.

Compared to the shortcoming and defect of prior art, the utility model has following beneficial effect: the utility model is made up of former and later two lens, two lens sizes and distance must meet computing formula requirement, light source emitted light mixes at shadow surface after two lensings, thus eliminate the problem that the shadow surface caused by form luminous intensity distributions such as simple lenses has yellow circle and macula lutea, realize the consistance of institute's shadow surface light colour temperature.

Accompanying drawing explanation

Structure, the position view of Fig. 1 to be the utility model for illuminator disappear yellow circle and macula lutea low-angle light-distribution lens group;

Fig. 2 is that the luminous intensity distribution in the utility model embodiment irradiates light field figure;

Fig. 3 is the CIE color space chromatic diagram in the utility model embodiment.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

A kind of illuminator that is used for disappears yellow circle and macula lutea low-angle light-distribution lens group, and as shown in Figure 1, comprise lens I and lens II, described lens I and lens II plane of incidence are plane, and exit facet is curved surface, and namely lens I and lens II are all plano-convex lens; The plane of lens I is relative with the curved surface of lens II, and described lens I and lens II are placed with optical axis; H ₁with H ' ₁lens I object space principal point and image space principal point, H ₂with H ' ₂lens II object space principal point and image space principal point; Wherein, lens I image space principal point H ' ₁with lens II object space principal point H ₂between distance be the half of the image space focal length of lens I and the image space focal length sum of lens II.

Actual luminous intensity distribution principle of the present utility model is described in detail as follows:

S1, lens I and lens II placed with optical axis, lens I and lens II plane of incidence are plane, and exit facet is curved surface, and the plane of lens I is relative with the curved surface of lens II.

In step sl, the position relationship between lens I and lens II as shown in Figure 1, wherein, o ₁, o ' ₁and o ₂, o ' ₂be respectively the curved surface summit, left and right of lens I and lens II; L is the spacing of lens I image space principal point and lens II object space principal point; On the left of lens I and lens II, curved surface (plane of incidence) is the plane of radius-of-curvature r=∞, and it is r that right side curved surface (exit facet) is respectively radius-of-curvature ₁, r ₂curved surface.

S2, according to the index of refraction in lens, plane of incidence radius-of-curvature, exit facet radius-of-curvature and lens thickness, calculate the image space focal length of lens I and lens II respectively.

In step s 2, according to the geometric optical theory of thick lens, image space focal length formula is:

$f^{\′}=\frac{1}{(n-1)\×[\frac{1}{r_1}+\frac{1}{r_2}+\frac{d\×(n-1)}{r_1\×r_2}]}$

Work as r ₁=r, r ₂=∞, then formula can be changed into therefore, (1) lens I image space focal length formula: (2) lens II image space focal length formula:

S3, according to described image space focal length determination lens I and the distance between lens II image space principal point and object space principal point

In step s3, lens I and the distance between lens II image space principal point and object space principal point this formula is the achromatism condition of image optics, that is non-imaged luminous intensity distribution eliminates the necessary requirement of yellow circle and macula lutea.

S4, to place lens I and lens II according to the distance between described principal point and eliminate Huang circle in illuminator and macula lutea.

In step s 4 which, simulated with macula lutea colourity by above-mentioned steps S1 ~ S3 step yellow circle that carries out disappearing, first the radius-of-curvature r of two lens is set ₁and r ₂, then according to the image space focal length formulae discovery of lens go out the focal distance f of two lens ' ₁with f ' ₂, the spacing of two lens is then calculated according to achromatism principle in ray-tracing software TracePro, according to lens radius of curvature, focal length and spacing arrange two lens respectively, then add three primary colours (white light) light source and carry out simulation of following spot, through TracePro ray-tracing software analog result as shown in Figures 2 and 3, border circular areas in Fig. 2 is that luminous intensity distribution irradiates light field, Fig. 3 is CIE color space chromatic diagram (X-axis, Y-axis represents the chromaticity of color, CCT is correlated color temperature of light source), light source through disappearing yellow circle and the lens combination of macula lutea project receive optical screen after form hot spot as Fig. 2, chromatic diagram through Fig. 3 represents, the hot spot colour temperature CCT=5306K formed, inside circular light spot and periphery there is no yellow circle and macula lutea, illustrate that light source defines low-angle and the Huang circle eliminated because simple lens luminous intensity distribution is formed and macula lutea through lens combination.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent replace and improve, three lens combination and four lens combination etc., all should be included within protection domain of the present utility model.

Claims (1)

1. to disappear yellow circle and a macula lutea low-angle light-distribution lens group for illuminator, it is characterized in that, comprise lens I and lens II, described lens I and lens II plane of incidence are plane, and exit facet is curved surface, is namely all plano-convex lens; The plane of lens I is relative with the curved surface of lens II, and described lens I and lens II are placed with optical axis; H ₁with H ' ₁lens I object space principal point and image space principal point, H ₂with H ' ₂lens II object space principal point and image space principal point; Wherein, lens I image space principal point H ' ₁with lens II object space principal point H ₂between distance be the half of the image space focal length of lens I and the image space focal length sum of lens II.