CN105090886A - Lens and lens system and purpose thereof - Google Patents

Abstract

The invention discloses a lens and a lens system and purposes thereof. The lens comprises a front surface, a rear surface, and a side surface extending between the front surface and the rear surface. The rear surface defines a cavity facing the rear part. The front surface comprises a central surface, and an edge surface connected with the central surface in a surrounding manner. The edge surface extends between the central surface and the side surface. The lens is an axisymmetric body and a central axis is defined. The lens is cooperatively placed on the central axis, and forms a lens system with an LED light source which can move in the cavity or other similar light sources. The lens system realizes high utilization rate of emergent light of the light source, and functions of collimation and focusing on incident light. The lens system can be used in a flashlight with a focusing function.

Description

A kind of lens and lens combination and uses thereof

Technical field

The present invention relates to a kind of optics, particularly relate to a kind of lens and lens combination and purposes.

Background technology

Along with the development of semi-conducting material and technique, light emitting diode (LED) replaces conventional light source just gradually.This to reach in equivalent brightness situation the required energy consumed well below ordinary incandescent lamp because principle of luminosity that light emitting diode is special is it, and it has the advantages such as the life-span is long, pollution-free, throwing light on and field of backlights has wide prospect.

In LED illumination product, people obtain suitable distribution of light and intensity of illumination, often needing lens are installed before LED lamp bead again, realize the convergence to light with this, can the light that place sends from its focus be changed into directional light as adopted Fresnel Lenses.

In addition, in order to be made full use of by LED light line further, current main stream approach is on lens, arrange a cavity, is arranged on by LED light source in this cavity.Because LED is only distributed in 180 degree of spaces as what send during spot light, the all light utilizing said method that LED can be made in theory to send can inject lens, adjust according to the exit direction of structure to incident light of lens, to reach the effects such as convergence, even light again.

Also have the requirement for emergent light hot spot in some usage scenarios, this can be realized by the relative position of adjustment LED light source and lens usually.

Realize all demands as above, need the shape being obtained lens by accurate analog computation.These type of lens generally all have front surface, side surface, rear surface at present, and rear surface can limit the put area that a cavity is used as LED light source, and all light sent to make LED can be limited in cavity.Now need to calculate according to the light path of design the arc shape deriving front surface, rear surface and side surface, this has also related to the mutual cooperation in each surface, and this is particularly important for the light path control realizing light.

Under the prerequisite not considering lens material cost, above this design is easier to achieve.Along with further considering for lens cost, various product design of more saving material constantly produces, and it is mainly through reducing the distance between front surface and rear surface, by lens do thinner, realize the saving for material.For the arc shape precision of front surface, rear surface and side surface and the requirement that coordinates each other even higher, thus design difficulty is larger, and the design cycle is also longer.

Equally for the processing of lens, the machined surface that needs accurately control or difficulty of processing is large is more, and the preparation for lens is more difficult, directly affects the yield rate of product thus.

Therefore, those skilled in the art is devoted to exploitation one and can realizes the high usage for LED light source (or being similar to the light source of LED) light and possess convergence, focusing function, and save material, structure simply, the lens of few high-precision requirement optical surface fall as far as possible.

Summary of the invention

For achieving the above object, the invention provides a kind of lens, and these lens coordinate lens combination of light source and uses thereof.

The side surface that lens comprise front surface, rear surface and extend between described front surface and described rear surface, described front surface is positioned at the front portion of described lens, and described rear surface is positioned at the rear portion of described lens; Described rear surface defines back-oriented chamber; Described front surface comprises central surface and around the edge surface connecting described central surface, described edge surface extends between described central surface and described side surface; Described lens define central axis; Described chamber comprises sidewall and bottom, and described sidewall and described bottom define cavity space, and described central axis is through described central surface and described bottom; The line segment that described edge surface is corresponding in described center cross-sectional, i.e. edge line segment, by being parallel to the line segment of described central axis and alternately connecting to form perpendicular to the line segment of described central axis, is similar to right angle stairstepping.

Further, described lens are by the arbitrary cross section of described central axis, i.e. center cross-sectional, figure is all identical, and namely defining lens is axisymmetric bodies, and central shaft is exactly central axis

Further, the line segment that described central surface is corresponding in described center cross-sectional, i.e. central line segment, in camber line.In other words, described central surface is cambered surface.

Further, the arc convex direction of described central line segment is away from described bottom, and namely described central surface is anterior protruding to described lens.

Further, the bearing of trend that described edge line segment is parallel to described central axis is identical with the arc convex direction of described central line segment, and described edge line segment is extending away from described central line segment perpendicular in described central axial direction.Namely described edge surface and described central surface roughly form bowl-type, and the opening of bowl is positioned at the front portion of described lens, contrary with the opening in described chamber.

Further, the line segment that described sidewall is corresponding in described center cross-sectional, i.e. sidewall line segment, linearly or camber line.

Further, described sidewall line segment is parallel to described central axis, and namely described sidewall is cylindrical.

Further, described bottom is cambered surface or plane, and when described bottom is cambered surface, the protrusion direction of cambered surface is not limit, can be identical with the protrusion direction of described central surface, also can be contrary with it.Principle matches with described central surface the effect forming convex lens or realize convex lens in described bottom.

Further, described sidewall matches to meet with described side surface: the reverberation reflected through described side surface after the incident light that the spot light being positioned at described central axis sends injects described lens by described sidewall is parallel to described central axis.Under the condition that the index of refraction in lens and light source position are determined, for refraction, the reflected light path of light, adopt the homologous thread of mathematical method contralateral surface in center cross-sectional to derive, obtain curvilinear equation, thus also just determine the curved surface pattern of side surface.

Further, the size of described edge surface meets: the reverberation reflected through described side surface is all direct to be penetrated from described edge surface.Reverberation in conjunction with described side surface is parallel to described central axis, and now the emergent light of described edge surface is collimated light beam.

Further, the shape of described side surface meets: described side surface is totally reflected the incident light entered by described sidewall.

Further, described central surface matches to meet with described bottom: the incident light that the spot light being positioned at described central axis sends injects described lens by described bottom, then corresponding emergent light only penetrates from described central surface.This is when the index of refraction in lens is determined, can draw the dimension combination of described central surface and described bottom simply by refractive index equation.

Further, the shape of described edge surface meets: the emergent light penetrated from described central surface can not be stopped by described edge surface.Namely the shoulder height of described edge surface can not stop the emergent light penetrated from described central surface.

Further, described side surface is coated with total reflection film.

Further, described total reflection film is silver.

Further, the material of described lens is polymethyl methacrylate (PMMA).

Adopt the lens combination of said lens, comprise described lens, light source, described light source provides the incident light of described lens.

Further, described light source is on the central axis of described lens.

Further, described light source can move along described central axis.

Further, the moving range of described light source is the inside in the chamber at described lens, and comprising with described chamber distance is the position of 0.

Further, the moving range of described light source is to going deep into 10mm in described chamber apart from described chamber 0mm.

Further, when described light source apart from described chamber 0mm to when going deep into moving in 10mm process in described chamber, the maximum angle of the emergent light penetrated from the central surface of described lens is 8-90 degree.

Further, described light source is LED light source, or the light source of similar LED, namely has LED light source monochromaticjty good, the light source characteristic such as being only distributed in 180 degree of spaces sent.

Said lens system can be used for the flashlight with adjustable focus function.

Lens of the present invention and lens combination have following advantage:

1, LED light source (or light source of similar LED) utilizing emitted light can be made full use of, achieve the high usage for luminous energy;

2, emergent light is divided into collimation emergent light and adjustable emergent light, design can adjusts very easily the ratio of two parts emergent light, to adapt to different user demand;

3, adjustable spot scope is large, can meet multiple instructions for use;

4, machining accuracy or the larger optical surface of difficulty only have side surface, thus reduce manufacture difficulty.

5, the similar bowl-type of lens, saves making material.

Accompanying drawing explanation

Fig. 1 is the front view of a preferred embodiment of lens of the present invention;

Fig. 2 be along A-A in Fig. 1 to sectional view;

Fig. 3 is incidence, the outgoing schematic diagram of the collimated ray of lens component shown in Fig. 2, merely illustrates the light on the right side of central axis;

Fig. 4 is incidence, the outgoing schematic diagram of the whole collimated ray of lens shown in Fig. 2;

Fig. 5 is incidence, the outgoing schematic diagram of the focused ray of lens component shown in Fig. 2, and light source is positioned at outside the chamber of lens, merely illustrates the light on the right side of central axis;

Fig. 6 is incidence, the outgoing schematic diagram of the whole focused ray of lens shown in Fig. 2, and light source is positioned at outside the chamber of lens;

Fig. 7 is incidence, the outgoing schematic diagram of the focused ray of lens component shown in Fig. 2, and light source is positioned at the chamber of lens, merely illustrates the light beam on the right side of central axis;

Fig. 8 is incidence, the outgoing schematic diagram of the whole focused ray of lens shown in Fig. 2, and light source is positioned at the chamber of lens;

Fig. 9 is incidence, the outgoing schematic diagram of all light of lens shown in Fig. 2, and light source is positioned at the chamber of lens;

Figure 10 is the coordinates computed figure of side surface homologous thread in center cross-sectional of lens shown in Fig. 2;

Figure 11 is the critical point schematic diagram of side surface homologous thread in center cross-sectional of lens shown in Fig. 2;

Figure 12 is the schematic diagram of another preferred embodiment of lens of the present invention, and the protrusion direction of bottom cambered surface is away from central surface;

Figure 13 is the schematic diagram of another preferred embodiment of lens of the present invention, and bottom is plane;

Figure 14 is the schematic diagram of a preferred embodiment of the flashlight adopting lens combination of the present invention, and LED light source is in the accent of lens;

Figure 15 is the schematic diagram that the LED light source of flashlight shown in Figure 14 is in the chamber of lens.

Detailed description of the invention

Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.

Lens 1 as depicted in figs. 1 and 2, the side surface 4 comprising front surface 2, rear surface 3 and extend between front surface 2 and rear surface 3; Rear surface defines back-oriented chamber 5; Front surface 2 comprises central surface 201 and around the edge surface 202 connecting central surface 201, edge surface 202 extends between central surface 201 and side surface 4; Lens 1 define central axis 6, and lens 1 pass through the arbitrary cross section of central axis 6, i.e. center cross-sectional, and figure is all identical, and namely defining lens 1 is an axisymmetric body, and central shaft is exactly central axis 6; Chamber 5 comprises sidewall 501 and bottom 502, and sidewall 501 and bottom 502 define cavity space, and central axis 6 is through central surface 201 and bottom 502; The line segment that edge surface 202 is corresponding in center cross-sectional, i.e. edge line segment 204, by being parallel to the line segment of central axis 6 and alternately connecting to form perpendicular to the line segment of described central axis 6.Be similar to right angle stairstepping, the line segment that namely edge surface 202 is corresponding in center cross-sectional is stairstepping line segment, and it is connected to form by the line segment that many are parallel or perpendicular to central axis 6.

The line segment that central surface 201 is corresponding in center cross-sectional, i.e. central line segment 203, in camber line, namely the cambered surface that central surface 201 is centrally axis 6 symmetries is defined, this cambered surface is a Surface of Sphere in the present embodiment, its protrusion direction is contrary with the opening direction in chamber 5, and identical with the bearing of trend of edge surface 202 centrally axis 6.Meanwhile, edge surface 202 along the extension perpendicular to central axis 6 away from central surface 201.The sidewall 501 in chamber 5 is parallel to central axis 6, and namely sidewall 501 is cylindrical.

Lens 1 need coordinate the light source be positioned on central axis 6 to use, the characteristic of lens 1 is further illustrated below for spot light, as shown in Figure 3 and Figure 4, the spot light 7 be positioned on central axis 6 provides incident light, the incident light of lens 1 is injected from sidewall 501, reverberation after side surface 4 reflects is parallel to central axis 6, and last reverberation all penetrates from edge surface 202.Because edge surface 202 only includes the vertical anchor ring with being parallel to central axis 6, the emergent light therefore penetrated from edge surface 202 is also parallel to central axis 6, achieves the collimation outgoing to incident light.Using sidewall 501, the edge surface 202 of above-mentioned pattern, under the prerequisite simultaneously determined at lens material (refractive index), design only needs the arc shape of accurate Calculation side surface 4 namely can realize above-mentioned alignment function, on side surface 4, realize total reflection (the deduction computational methods about side surface 4 describe in detail hereinafter) simultaneously.From difficulty of processing, sidewall 501 and the edge surface 202 of lens 1 have only included the face perpendicular or parallel with central axis 6, processing is relatively simple on realizing, and what need strict control accuracy only has side surface 4, greatly reduces the factor that optical surface affects each other.

Under the prerequisite that lens material (refractive index) is determined, for realizing the total reflection of side surface 4, pattern for side surface 4 has a definite limitation, so for some specific dimensional requirement, may cannot meet when designing and realize total reflection on side surface 4, at this moment can on side surface 4 plating total reflection film, such as silver.

As viewed in figures 5-8, spot light 7 is positioned on central axis 6, and spot light 7 centrally can move to the inside in chamber 5 by axis 6.Inject the incident light of lens 1 from bottom 502, under the prerequisite that lens material (refractive index) is determined, central surface 201 can be obtained from refraction equation and combine with the various sizes of bottom 502, all penetrate from central surface 201 to realize corresponding emergent light.In the present embodiment, central surface 201 and bottom 502 are Surface of Sphere and ellipsoidal surface respectively, and protrusion direction is identical, jointly forms convex lens, assembles incident light, to make the uniform light spots in emergent light formation certain limit.Now the shape (in other words the shoulder height of hierarchic structure) of edge surface 202 need meet, and can not stop the emergent light penetrated from central surface 201.When spot light 7 gos deep into inside, chamber 5 gradually, the maximum angle of emergent light also increases thereupon, achieves the adjustment to spot size.

The complete ray plot that the utilizing emitted light that Fig. 9 shows light source 7 focuses on through lens 1 and collimates.

Figure 10 is the coordinate diagram of side surface homologous thread equation in center cross-sectional, wherein namely Y-axis is central axis, also comprise light path 9, side surface curve 10 corresponding in center cross-sectional, the sidewall line segment 11 being parallel to Y-axis, angle a, b, c, d, below describe the computational methods of curvilinear equation in detail:

Setting lens parameter: r---chamber perforate radius, R bottom lens---lens bottom radius, n---index of refraction in lens.

Target: under above Parameter Conditions, forms curvilinear equation y=f (x) of total reflection collimated light

1, Pn point place tangential equation is asked:

∵f′(x)=tand

∵(90°-c)+2d=180°

∴

$n\sin c=\sin b=\cos a\→c=\arcsin \left(\frac{\cos a}{n}\right)$

So cross the linear equation slope of this point:

Substituted into by Pn (Xn, Yn) coordinate, then the tangent line crossing Pn meets equation:

Can be similar to and think that the adjoint point Pn+1 of Pn is also on this tangent line.

2, Pn+1 point place equations of light ray:

∵y=tanc?(x-r)+rcota

∵ $n\sin c=\sin b=\cos a\→c=\arcsin \left(\frac{\cos a}{n}\right)$

∴ $y=\tan \left[\arcsin \left(\frac{\cos a}{n}\right)\right](x-r)+r\cot a...\left(2\right)$

3, constraints:

Limit slope is determined by the cirtical angle of total reflection

So have:

Due to direct solution not easily, might as well suppose to get limiting case: during a → 90 °, try to achieve can be totally reflected, this can realize for conventional PMMA and PC material; During a → 0 °, substitution can obtain: as n>1, and curved surface can be totally reflected, and this is obviously set up; Order

This function is 0<a<90 ° of monotone decreasing.Therefore, under same refractive index n, if curved surface can be totally reflected for the light that initial incidence angle is a=θ, then the light for a '=θ-Δ θ (θ and Δ θ is all greater than 0) must also can be totally reflected.

Only need refractive index to be greater than 1.414 when judging known a → 90 ° by particular value above just can be totally reflected,

Therefore, also can be totally reflected for the angles of less than 90 °, the result verification of a → 0 ° correctness of this reasoning.

Therefore this curve can be totally reflected for arbitrary light initial incidence angle a, only needs to consider the requirement on lens arrangement height during design.

4, curvilinear equation discrete solution is asked:

To solve an equation the equation group of (1) and (2), using P0 coordinate as Pn, get a=1 ° of substitution, can about the equation group of X and Y.

The equation group of (3) and (4) of solving an equation can obtain P1(X1, Y1)

Again using P1(X1, Y1) coordinate as P0, get a=2 ° of substitution (1), (2) can obtain new equation group

In like manner, the equation group of (5) and (6) of solving an equation can obtain P2(X2, Y2)

By that analogy, can in the hope of a series of P point coordinates.

By discrete some P0->Pn, by statistical software, as Excel, MATLAB, fitting of a polynomial becomes curvilinear equation: y=f (x).

Equally also can pass through Program, program example is as follows:

clearall;clc

%TheFristStep defines regulated variable

R=6; % selects perforate radius

R=8.5; % defines curved bottom portion radius

N=1.49; % definition material refractive index

Angles=(90:-0.5:40); % definition calculates angular range

%TheSecondStep defines intermediate variable

num=length(angles);

Y0=R;Z0=0;

fori=1:num

a(i)=(angles(i)*pi/180);

c(i)=asin(cos(a(i))/n);

k1(i)=tan((pi/2+c(i))/2);

k2(i)=tan(c(i));

end

The circulation of %TheThirdStep equation solves

fori=1:num

symsy;

f1=k1(i)*(y-Y0)+Z0;

f2=k2(i)*(y-r)+r*cot(a(i));

f=f1-f2;

yy=solve(f);

y=double(yy);

z=k1(i)*(y-Y0)+Z0;

Y0=y;

Z0=z;

Py(i)=Y0;

Pz(i)=Z0;

end

%TheForthStep fitting of a polynomial asphericity coefficient

cftool

% notes, arranges x=Pyy=Pz. during matching

As shown in figure 11, the critical point 14 of curve 10 development length is determined by light path 12 and curve 10, and light path 12 is opticpaths that light produces from the incidence of sidewall bottommost, and it meets refraction relational expression:

Sin θ 1=n × sin θ 2, n is the refractive index of lens, and θ 1, θ 2 are incidence angle and the refraction angle of light respectively.Can arrive side surface to meet from the light of sidewall incidence, the terminal that curve 10 upwards extends should lower than critical point 14.Same critical point 14 also defines the size of edge surface.

Adopt and use the same method, also can analyze the matching relationship of central surface and bottom.Now Water demand light from bottom away from the light path of the most marginal incident of central axis, the extension width of central surface is made to be enough to cover the refract light in this light path, can meet the incident light that the spot light that is positioned at central axis sends and inject lens by bottom, then corresponding emergent light only penetrates from central surface.

The structure shown by above-described embodiment is not limited to based on lens shape of the present invention.As Figure 12 shows another kind of adoptable lens shape, now the protrusion direction of bottom 502 cambered surfaces is away from central surface 201.Another kind of adoptable lens shape as shown in fig. 13 that again, now bottom 502 is planes.

It is pointed out that the shape of sidewall 501 also can change arbitrarily equally, considering the curvilinear equation of sidewall line segment when calculating, by above-mentioned computational methods, side surface curved surface with matching can be calculated equally.

Above-mentioned various lens are especially applicable to coordinating with LED light source (or light source of similar LED) forming lens combination, can also obtain higher light intensity utilization rate while realizing the technique effects such as zoom collimation.When arranging LED light source on central axis 6, and moveable scope in chamber 5 time (comprising with the distance in chamber 5 is 0), the light that LED light source sends can completely by sidewall 501 and bottom 502 receive.Simultaneously by regulating the position of LED light source in chamber 5, the adjustment to emergent light spot size can be realized.

In one more specifically embodiment, the material that lens adopt is polymethyl methacrylate, refractive index is 1.49, and design realizes when the moving range of light source is when going deep into 0-10mm in chamber 5, and the excursion of the maximum angle of the emergent light of central surface 201 injection of lens 1 is 8-90 degree.

Said lens system can be used for the flashlight with adjustable focus function, as light source and the optical element of flashlight.As shown in Figure 14 and Figure 15, be a kind of flashlight adopting lens combination of the present invention, wherein flashlight 15 comprises handle 17 and lens barrel 18, and both adopt stretching structure, thus can stretch and indentation at spacing.Lens 1 and LED light source 16 are fixed on lens barrel 18 and handle 17 respectively, carry out relative movement by flexible between lens barrel 18 and handle 17, thus realize focusing function.Figure 14 and Figure 15 respectively illustrates in the accent and chamber that LED light source 16 is in lens 1.The relative movement of handle 17 and lens barrel 18 is not limited to above-mentioned mode, and it is flexible that both also can adopt helicitic texture to realize.Any connected mode making lens 1 and LED light source 16 produce relative movement can realize the focusing function of flashlight.

Said lens system can also be applied to other needs to regulate spot size (or focus on, the occasion that changes alternately of astigmatism), the flash system, stage lighting system etc. of such as camera.

It is to be noted in addition, by lens processing and flashlight assembly precision, LED light source size impact, in actual use, have some light in collimated light and cannot collimate outgoing, this will when LED light source mobile, there will be the bright ring that size changes thereupon in hot spot, this depends on actual processing and assembly precision and the selecting of size for LED light source completely.

More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (24)

1. lens, is characterized in that, the side surface that described lens comprise front surface, rear surface and extend between described front surface and described rear surface; Described rear surface defines back-oriented chamber; Described front surface comprises central surface and around the edge surface connecting described central surface, described edge surface extends between described central surface and described side surface; Described lens define central axis; Described chamber comprises sidewall and bottom, and described sidewall and described bottom define cavity space, and described central axis is through described central surface and described bottom; The line segment that described edge surface is corresponding in described center cross-sectional, i.e. edge line segment, by being parallel to the line segment of described central axis and alternately connecting to form perpendicular to the line segment of described central axis.

2. lens as claimed in claim 1, is characterized in that, described lens are by the arbitrary cross section of described central axis, i.e. center cross-sectional, figure is all identical.

3. lens as claimed in claim 2, is characterized in that, the line segment that described central surface is corresponding in described center cross-sectional, i.e. central line segment, in camber line.

4. lens as claimed in claim 3, it is characterized in that, the arc convex direction of described central line segment is away from described bottom.

5. lens as claimed in claim 4, it is characterized in that, the bearing of trend that described edge line segment is parallel to described central axis is identical with the arc convex direction of described central line segment, and described edge line segment is extending away from described central line segment perpendicular in described central axial direction.

6. the lens as described in as arbitrary in claim 1-5, is characterized in that, the line segment that described sidewall is corresponding in described center cross-sectional, i.e. sidewall line segment, linearly or camber line.

7. lens as claimed in claim 6, it is characterized in that, described sidewall line segment is parallel to described central axis.

8. lens as claimed in claim 5, it is characterized in that, described bottom is cambered surface or plane.

9. lens as claimed in claim 5, it is characterized in that, described sidewall matches to meet with described side surface: the reverberation reflected through described side surface after the incident light that the spot light being positioned at described central axis sends injects described lens by described sidewall is parallel to described central axis.

10. lens as claimed in claim 9, it is characterized in that, the size of described edge surface meets: the reverberation reflected through described side surface is all direct to be penetrated from described edge surface.

11. lens as claimed in claim 10, it is characterized in that, the shape of described side surface meets: described side surface is totally reflected the incident light entered by described sidewall.

12. lens as claimed in claim 11, it is characterized in that, described central surface matches to meet with described bottom: the incident light that the spot light being positioned at described central axis sends injects described lens by described bottom, then corresponding emergent light only penetrates from described central surface.

13. lens as claimed in claim 12, it is characterized in that, the shape of described edge surface meets: the emergent light penetrated from described central surface can not be stopped by described edge surface.

14. lens as claimed in claim 1, it is characterized in that, described side surface is coated with total reflection film.

15. lens as claimed in claim 13, is characterized in that, described total reflection film is silver.

16. lens as claimed in claim 1, it is characterized in that, the material of described lens is polymethyl methacrylates.

The lens combination of the arbitrary lens of 17. 1 kinds of employings as described in claim 9-16, it is characterized in that, comprise described lens, light source, described light source provides the incident light of described lens.

18. lens combinations as claimed in claim 17, it is characterized in that, described light source is on the central axis of described lens.

19. lens combinations as claimed in claim 18, it is characterized in that, described light source can move along described central axis.

20. lens combinations as claimed in claim 19, is characterized in that, the moving range of described light source is the inside in the chamber at described lens.

21. lens combinations as claimed in claim 20, is characterized in that, the moving range of described light source is to going deep into 10mm in described chamber apart from described chamber 0mm.

22. lens combinations as claimed in claim 21, is characterized in that, when described light source apart from described chamber 0mm to when going deep into moving in 10mm process in described chamber, the maximum angle of the emergent light penetrated from the central surface of described lens is 8-90 degree.

23. lens combinations as described in claim 18-22, it is characterized in that, described light source is LED light source.

The purposes of 24. arbitrary lens combinations as claimed in claim 23, is characterized in that, described lens combination is for having the flashlight of adjustable focus function.