CN2456011Y - Uniform high performance lumination system wire relative orifile diameters - Google Patents

Abstract

The utility model relates to an energy compression process, which is characterized in that micro array lenses are used for firstly differentiating light energy generated by a light source and then integrating the light energy to superimpose an intermediate image S' of which the area is much smaller than that of a primary light source while the energy density is much larger than the that of the primary light source. Finally, a uniform and effective illuminating quality with a small relative aperture is obtained. The utility model is suitable for a star point collimator which is used for precision optical check, and is also applied in a starlight simulator, etc.

Description

The lamp optical system of the little relative aperture of uniform high-efficiency

The utility model uniform high-efficiency, little relative aperture lamp optical system, it belongs to optical system in the optical field.

For the utility model desired efficient, evenly, the condition of small-bore, small field of view, conventional in the past lighting system (critical illumination, Kohler illumination) all can't satisfy.For critical illumination, at first it can't satisfy inhomogeneity requirement, and the light source utilization rate is low, needs the system of high-energy, even light to be suitable for to some; For Kohler illumination, still the low problem of energy exist, though and Kohler illumination can obtain the result of throwing light on more uniformly, but if the relative aperture of illuminated optical system hour, it is long that Kohler illumination structurally just seems.

Therefore, we have designed the lighting system of microlens array, come reasonable addressing this problem.

The purpose of this utility model is for a kind of efficient, even lamp optical system that is applicable to little relative aperture being provided, improving lighting quality.

The concrete structure of the even lamp optical system of the utility model is seen accompanying drawing 1 (connecing the critical illumination mode only is example).

It comprises: S light source, L ₁Collimating mirror (also being the stop position), H ₁Array lens, H ₂Array lens, L ₂Condenser, L ₃Condenser, S ' light source intermediate image plane, S " light source image planes

Among Fig. 1, from the light that light source S sends, process collimating mirror L ₁, with directional light irradiation array lens H ₁, H ₁This directional light is focused on, and light source S is imaged in the second block array lens H ₂On, H ₁With H ₂In lenslet number with arrange identical, H ₁The energy that impinges upon the light on the diaphragm L1 is divided into several portions, i.e. " differential " is then through H ₂, L ₂" integration ", stack each several part luminous energy is located in S ', obtain be one more much smaller than primary source area, and the much bigger intermediary image S ' of energy density, re-use the critical illumination mode this moment is light source with S ', through L ₃Be imaged as the picture S of satisfactory little relative aperture ".At last, " pin hole of locating to place required size gets final product at S.

Here, we compare itself and conventional lighting system and illustrate:

In the native system " S '-L ₃The mode that this part of-S " " adopts is critical illumination (also can be a Kohler illumination) mode, and the light source of this partial illumination is S '.

And directly use critical illumination (also Kohler illumination) the used light source of mode is S.

Suppose u=u ', so, other condition is identical.

So as long as we are with S, S ' relatively, the difference of end product as can be seen just.Introduce us and know that S ' is through the microarray lens combination by S by top, " differential " earlier, back " integration ", the light source picture of a high-energy-density in small size that obtains, on its area than S much smaller (being that the visual field is less than S), at the energy of unit are again far above S, and has good uniformity, therefore know by top comparison condition, that with S " it is certain higher than directly making the efficient that light source obtains with S behind critical illumination (or Kohler illumination) to make light source, and uniformity is better.

If lenslet has several or dozens of in the array lens, then S ' locate just to be thrown light on uniformly, smaller picture and higher energy density, the interval of each lens of design alternative and focal length then can " locate to obtain smaller angular aperture at S again.

Array lens H wherein ₁And H ₂In lenslet can be optical glass or crystalline material, also can be optical fiber lens.

The advantage of the even lamp optical system of the utility model is that it provides a kind of uniform high-efficiency lamp optical system that is suitable for little relative aperture (D/F), and the light source utilization rate is higher relatively, and there is good illuminance at the image planes place; The image planes good uniformity.Compare and improved lighting quality with critical (or Ke Le) illumination.Be applicable to the asterism parallel light tube of precision optics check usefulness, also can be used for starlight analog device.Shortcoming is that system is complicated, compares with conventional lighting system in the past, and cost is higher.

Description of drawings:

Fig. 1 is even lamp optical system optical texture schematic diagram (being example to connect the critical illumination mode behind the S ' only).

Reference example:,, make L with optical glass with the area source of φ 3mm with reference to accompanying drawing 1 ₁Collimating mirror, and H ₁, H ₂Each 9 of array lenses.The interval of each lens is respectively with focal length:

S is to L ₁Distance be 20mm, H ₁To H ₂Distance be 20mm, L ₂Distance to S ' is about 20mm, and S ' is to H ₃Distance be 20mm, L ₃Distance to S ' is 60mm, and each aperture of lens is φ 6mm.

The focal length of each lens is

F ＇ _L1=f ＇ _H1=f ＇ _L2=20mm, f ＇ _L3=15mm obtains the result $u\″=\frac{1}{20}\mathrm{rad}$

Claims (2)

1, even lamp optical system is characterized in that it is a kind of uniform high-efficiency lamp optical system that is applicable to little relative aperture, and it comprises: S light source, L ₁Collimating mirror, H ₁Array lens, H ₂Array lens, L ₂Condenser, L ₃Condenser, S ' light source intermediate image plane, S " light source image planes.The light that sends from light source S passes through collimating mirror L ₁, arrive array lens H with parallel light ₁, H ₁This directional light focusing is also imaged in the second block array lens H to light source S ₂On, through H ₂, L ₂, stack each several part luminous energy is located in S ', critical illumination again, the light source that obtains a little relative aperture is as S ".

2, according to the described even lamp optical system of claim 1, it is characterized in that array lens H ₁And H ₂In lenslet number with arrange identical, H ₁And H ₂In lenslet can make of optical glass or crystalline material, also can be optical fiber lens.