CN2743853Y - Mirror type light source system - Google Patents

Abstract

The utility model belongs to the technical field of projection display optical technology, relating to a mirror type light source system, comprising a light source (1) and a square rod (6). The mirror type light source system is also characterized in that a semi-sphere reflecting mirror (2) and a semi-ellipsoidal reflecting mirror (3) are comprised. The light source (1) is placed on the first focus (4) of the semi-ellipsoidal reflecting mirror (3) whose opposite face is provided with the semi-sphere reflecting mirror (2), and thus the image of the light source (1) is formed on the second focus (5) of the semi-ellipsoidal reflecting mirror (3). The square rod (6) is placed in the vicinity of the second focus (5) of the semi-ellipsoidal reflecting mirror (3). The square rod (6) relative to an axial trace is placed and a slope angle an is formed, which satisfies the equation a an arctan ((1-e<2>)/2e). An average rectangle lighting is formed at the end of the square rod (6) after the light emitted from the light source (1) enters the square rod (6) and is multiply reflected. Compared with the standard ellipsoidal-typed square rod lighting system, the adoption of the double-casting-typed lighting system has the advantages of high efficiency in solar energy utilization for lighting, simple structure, practicability requirement satisfaction, simple art work and low price.

Description

Reflection mirror light-source system

One, technical field

The utility model belongs to the Projection Display optical technical field, relates to a kind of illuminator that has cold reflector design.

Two, background technology:

The projection display system that with the spatial light modulator is image source had obtained develop rapidly in recent years, in commercial affairs, scientific research, education, amusement and family life, be widely used, digital micro-mirror array (DMD) technology particularly, utilize the incoherent light modulator techniques of microfabrication and large scale integrated circuit technological development, with its simple principle, outstanding performance has realized commercial applications.Because DMD has the new feature that is different from other photomodulator, therefore research is applicable to that the illuminator of DMD Projection Display becomes more important.

In order to reduce cost, reduce the volume and the weight of projection display system, TI company of the manufacturer development product size of DMD is more and more littler, has experienced 1.3,0.9,0.7 inch evolution, and has developed towards 0.55,0.5 inch direction.Guarantee the optical efficiency of system, must improve illuminator, according to the nonimaging optics theory, under the constant condition of other conditions, must reduce the optical extend of illuminator synchronously, and the design of existing lighting source, in the research that reduces dimension of light source, obtained progress, but only can not meet the demands, and guarantee safety by reducing the light source arc length, cheaply under the prerequisite dimension of light source reduce also become more and more difficult.Therefore the optical extend that will reduce light source just must improve design to reflector with the requirement that adapts to undersized spatial light modulator.

At present traditional reflector design is to adopt the paraboloid of revolution or revolution ellipsoid reflector, as shown in Figure 1, bring bigger aberration inevitably into owing to controllable parameter is limited, spherical aberration particularly, directly have influence on the optical extend of system, thereby the optical extend of illuminator is increased, when using the photomodulator of large-size (for example 0.9 inch), this problem is also not outstanding, when using with the photomodulator coupling of reduced size (for example 0.55 inch), because optical extend is limited, the efficient of system further reduces.

Three, summary of the invention:

In order to overcome above-mentioned optical system big aberration is arranged, spherical aberration particularly, the optical extend of illuminator is increased, the shortcoming that system effectiveness is low, the purpose of this utility model is by the reflector design that improves light source the optical extend of illuminator to be reduced, and to satisfy the spatial light modulator needs of reduced size, improves the illumination efficiency of system, for this reason, the utility model provides a kind of light-source system that is suitable for the reduced size photomodulator.

Content of the present utility model: comprising: light source, hemisphere face catoptron, half ellipsoidal surface catoptron, first focus, second focus and square rod, light source is placed on first focus in the half ellipsoidal surface catoptron, the hemisphere face catoptron is placed on opposite at the half ellipsoidal surface catoptron, according to a some image-forming principle, make light source imaging on second focus of half ellipsoidal surface catoptron, square rod is placed near second focus of half ellipsoidal surface catoptron, allows square rod with respect to axes O--and the inclined angle alpha of O ' placement is:

$\mathrm{\&alpha;}=\arctan \left(\frac{1-e^2}{2e}\right)$

E is the eccentricity of half ellipsoidal surface catoptron, and the light that light source sends enters square rod through repeatedly reflection, forms uniform rectangular illumination at the end of square rod.

The further improved design of the utility model: comprising: light source, hemisphere face catoptron, half ellipsoidal surface catoptron, first focus, second focus, square rod, the 3rd focus and half hyperboloidal mirror, on light source is placed on first focus in the half ellipsoidal surface catoptron along optical axis, the hemisphere face catoptron is placed on opposite at the half ellipsoidal surface catoptron, according to a some image-forming principle, make light source imaging on second focus of half ellipsoidal surface catoptron, square rod is placed near the 3rd focus of half hyperboloidal mirror; The plane of incidence of square rod overlaps with the focal plane of half hyperboloidal mirror, and the light that light source sends enters square rod through repeatedly reflection, forms uniform rectangular illumination at the end of square rod.

Light source sends among the utility model Fig. 2 light through hemisphere face catoptron, half ellipsoidal surface catoptron after the incident square rod, after sparing light from the even rectangular illumination light of square rod outgoing.Light source sends among Fig. 3 light through hemisphere face catoptron, half ellipsoidal surface catoptron, half hyperboloidal mirror after the incident square rod, after sparing light from the even rectangular illumination light of square rod outgoing.

Good effect:

Because adopted the form of hemisphere face catoptron, half ellipsoidal surface arrangement of mirrors catoptron, like this, most of luminous energy concentrates on the little ranges of incidence angles of square rod, obviously solid angle Solid Angle has reduced.From another perspective, by adopting the hemisphere face catoptron, the area of light beam in the transmission way reduces half, the end of square rod forms uniform rectangular illumination, be imaged onto on the spatial light modulator by the outer relay lens of light-source system then, then be scaled to the size of spatial light modulator and the F/# of projection lens and be complementary.

The utility model reduces the optical extend of illuminator by the method that reduces imaging size and light beam solid angle, to satisfy the spatial light modulator needs of reduced size, the illumination efficiency of raising system satisfies the needs that reduced size DMD throws light on, and relatively simple for structure.

We adopt the spatial light modulator of 0.5,0.55,0.7,0.78,0.9,1.3 inch F/#=2 respectively under guaranteeing that illumination uniformity on the spatial light modulator is greater than 90% condition, realize 14 ° of subtended angle telecentric lights.Utilize LightTools software lighting module modeling and simulation, by calculating 200, article 000, with glazed thread, obtained the design result of optimizing on analog slm, the optical efficiency that obtains ellipsoid hyperbolic secondary imaging type and standard spheroid type square rod illuminator is relatively as Fig. 4.Fig. 4 illustrates and adopts double parabolic type square rod illuminator than standard spheroid type square rod illuminator the higher illumination efficiency of light energy utilization to be arranged.And, ellipsoid hyperbolic secondary imaging type square rod illuminator simple in structure satisfies the practicality requirement, and technology and price are not problems, adopt novel, high-level efficiency, combination from the cold reflector design of shaft type, realize high efficiency light-source system by suitably choosing face shape parameter and relative position.

Four, description of drawings:

Fig. 1 is the structural representation of prior art standard spheroid type square rod illuminator;

Fig. 2 is the structural representation of the utility model embodiment semielliptical type square rod illuminator;

Fig. 3 is the synoptic diagram of the utility model embodiment ellipsoid hyperbolic secondary imaging type square rod illuminator;

Fig. 4 is the optical efficiency performance comparison figure of the standard spheroid type square rod illuminator of the utility model ellipsoid hyperbolic secondary imaging type and prior art.

Five, embodiment:

Design a kind of cold reflector formula light-source system that is suitable for the spatial light modulator of reduced size, can satisfy 0.7,0.55,0.5 inch DMD illumination.

The utility model by light source 1, hemisphere face catoptron 2, half ellipsoidal surface catoptron 3, square rod 6 and or half hyperboloidal mirror 8 form.

Embodiment 1: the utility model is implemented by structure as shown in Figure 2: be made up of light source 1, hemisphere face catoptron 2, half ellipsoidal surface catoptron 3, square rod 6.

Light source 1 adopts short-arc lamp; Hemisphere face catoptron 2 and half ellipsoidal surface catoptron 3 adopt the microcrystal glass material moldings formed therefrom to realize, and are coated with the cold reflective membrane of wide spectrum in hemisphere face catoptron 2 and half ellipsoidal surface catoptron 3, filter the infrared and ultraviolet spectral coverage harmful to Projection Display.Square rod 6 adopts hollow wide spectrum high reflection mirror or solid K9 glass to realize.

Embodiment 2: the utility model is implemented by structure as shown in Figure 3, is made up of light source 1, hemisphere face catoptron 2, half ellipsoidal surface catoptron 3, square rod 6 and half hyperboloidal mirror 8.Light source 1, hemisphere face catoptron 2, half ellipsoidal surface catoptron 3 and square rod 6 can be identical with embodiment 1.The material of half hyperboloidal mirror 8 adopts the devitrified glass moldings formed therefrom to realize.

Claims (2)

1, reflection mirror light-source system, comprise: light source (1), square rod (6), it is characterized in that also comprising: hemisphere face catoptron (2), half ellipsoidal surface catoptron (3), light source (1) is placed on interior first focus (4) of half ellipsoidal surface catoptron (3), hemisphere face catoptron (2) is placed on opposite at half ellipsoidal surface catoptron (3), make light source (1) go up imaging in second focus (5) of half ellipsoidal surface catoptron (3), square rod (6) is placed near second focus (5) of half ellipsoidal surface catoptron (3), allows square rod (6) with respect to axes O--and the inclined angle alpha of O ' placement is:

$\mathrm{\&alpha;}=\arctan \left(\frac{1-e^2}{2e}\right)$

The light that light source (1) sends enters square rod (6) through repeatedly reflection, forms uniform rectangular illumination at the end of square rod (6).

2, reflection mirror light-source system, comprise: light source (1), square rod (6), it is characterized in that also comprising: hemisphere face catoptron (2), half ellipsoidal surface catoptron (3) and half hyperboloidal mirror (8), light source (1) is placed on interior first focus (4) of half ellipsoidal surface catoptron (3) along optical axis, hemisphere face catoptron (2) is placed on opposite at half ellipsoidal surface catoptron (3), make light source (1) go up imaging in second focus (5) of half ellipsoidal surface catoptron (3), square rod (6) is placed near the 3rd focus (7) of half hyperboloidal mirror (8); The plane of incidence of square rod (6) overlaps with the focal plane of half hyperboloidal mirror (8), and the light that light source (1) sends enters square rod (6) through repeatedly reflection, forms uniform rectangular illumination at the end of square rod (6).

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