CN1885083A - Zooming apparatus of long-distance large-range semiconductor laser lighting device - Google Patents

Abstract

The invention relates to an application technique of semi-conductor laser, especially providing a semi-conductor laser lighting variable-focus device used in remote distance and wide range, wherein the invention comprises a semi-conductor laser; it is characterized in that: the front of laser is arranged with rectify light device, the thin lens group with positive refraction, the rectified light source S at the light axis of thin lens group, and the distance L between thin lens groups between 0 and f, while f is the focus of thin lens group; the lower end of thin lens group is arranged with mechanical transmission device connected to motor. The invention can electrically control the lighting angle and realize wide variation, with small volume and low cost.

Description

Zooming apparatus of long-distance large-range semiconductor laser lighting device

(1) technical field under

The present invention relates to the application technology of semiconductor laser, be meant a kind of Zooming apparatus of long-distance large-range semiconductor laser lighting device that is used for especially, the application apparatus when especially laser instrument is used as lighting source.

(2) background technology

With the device of semiconductor laser as light source, its light angle is generally all fixed, and both made design the time leave certain range of adjustment, but range of adjustment is all smaller, and is manual, in case after regulating when installing, just be completely fixed in the dust.The laser illuminator that is used for the railway locomotive monitor that relates among the patent Z972157018 is in order to see 2000 meters scenery signals clearly, with fixing very little of light angle.The laser illuminator product of Gao Bo, domestic Beijing video signal company and Beijing coherent light electronics corporation, its light angle all has certain range of adjustment, the back is fixing in the dust well by manual adjustments, in use can not change with the video camera zoom but when mounted.The semiconductor laser illuminating product of external Eagle Technology company, light angle can only manual adjustments in 1 °-3 °.

In the bigger application scenario of far and near distance, the illumination of fixed angle is just not too suitable.Because target need be amplified when remote, pick-up lens changes to long burnt, and the visual field is little, requires light angle also smaller, just enough illumination can be arranged; And it is short burnt to need closely the time big visual field, pick-up lens to change to, and requires light angle also enough greatly, just can be full of whole visual field.If light angle is fixed, when being easy to cause pick-up lens length burnt, light angle is excessive, surpasses the visual field, and object illumination is not enough; And pick-up lens is when short burnt, and light angle is too little, can not be full of the visual field.The laser illuminator that is used for auxiliary automobile lighting that relates among the patent CN99104568.6 scans illumination though can drive luminaire integral body by the mechanical scanning arm, and its sweep velocity is slow, has the shadow region, and the mechanical arm structure is also unstable.The miniature zooming structure (patent CN200310118153.8) that is used for the semiconductor laser illumination of Institute of Semiconductors,Academia Sinica's invention, can realize the bigger variation of light angle, but it has used special GRIN Lens, be difficult to reduce cost, and zoom moving range too little (5mm), the accuracy requirement height is difficult for realizing electronic automatic control.

For the night vision illumination more than 1000 meters, a proper light angle scope should be not less than 0.5 °-20 °.A kind of compromise solution is to improve Laser emission power, and light angle is fixed on bigger value (as 10 °), and can guarantee like this has enough illumination when remote, and enough illumination field of view are arranged in the time of closely.The semiconductor laser lighting (patent CN2005101083653.8) and the U.S. ALS-20 laser illuminator of the high-power optical fiber coupled output of inventions such as Zuo Fang are taked this mode exactly, and their optical output power is more than 20W, and power consumption is all more than 60W.But the unfavorable factor that this mode is brought is more, and power consumption increases quite high to cooling system and power requirement, otherwise can influence laser life-span, and its volume and weight also increases thereupon, is unfavorable for installing.Also have high power laser generally to want optical fiber coupling output, need use expensive optical element such as microlens array and GRIN Lens, cause its cost very high.When remote imaging, laser also keeps the wide-angle irradiation in addition, and energy dissipation is serious.

(3) summary of the invention

The present invention is in order to remedy the deficiencies in the prior art, provides a kind of and can realize the electronic control of light angle, continually varying Zooming apparatus of long-distance large-range semiconductor laser lighting device on a large scale.

The present invention is achieved through the following technical solutions:

A kind of Zooming apparatus of long-distance large-range semiconductor laser lighting device, comprise semiconductor laser, its special character is: the front end of described semiconductor laser is provided with shaping optical devices successively, has the thin lens group of positive light coke, light source S after the shaping is positioned on the optical axis of thin lens group, and and the interval L between the thin lens group satisfies: 0≤L≤f, wherein f is the focal length of thin lens group.

Zooming apparatus of long-distance large-range semiconductor laser lighting device of the present invention, it further improves and is: the lower end of described thin lens group is provided with one and drives the mechanical transmission mechanism that the thin lens group seesaws, and mechanical transmission mechanism is connected with motor.This mechanical transmission mechanism can control that spacing changes continuously between thin saturating group and the LASER Light Source, is used to control thin lens group and semiconductor laser light source relative position.

Zooming apparatus of long-distance large-range semiconductor laser lighting device of the present invention, the concavees lens of placement one further divergent beams between described shaping optical devices and the thin lens group.

Zooming apparatus of long-distance large-range semiconductor laser lighting device of the present invention, described thin lens group are simple lens, cemented doublet or air-spaced doublet or other more complicated thin lens group.

Described mechanical transmission mechanism is lead screw transmission, rack-and-pinion transmission or cam drive or other kind of drive.

Become continuously by mechanical electric structure control thin lens group and semiconductor laser light source relative position, change continuously on a large scale thereby reach the control light angle.

Its principle is as follows:

The light beam that semiconductor laser sends is generally about 10 ° of (level) * 40 ° (vertically), by the shaping optical devices, level and vertical divergence angle is made into basically identical (needed angle).After the thin lens group angle compression of light beam through having positive light coke, with the outgoing beam outgoing, the emergent light angle is relevant with distance L after the shaping, and L is a distance between light source s and the lens.Motor will rotatablely move by mechanical transmission mechanism and be converted to rectilinear motion, and drive lens seesaws, adjustable range L, thereby the shooting angle of control outgoing beam.Lens seesaw in the process, guarantee that all the time light source S is positioned on the optical axis of lens, and whole optical system is coaxial.

The angle of outgoing beam by shaping after interval L size decision between focal distance f, lens and the light source of angle of divergence θ, lens of light source S.As shown in Figure 2, special, light source S is positioned within the preceding some F of lens, becomes virtual image light source S ' behind lens, and the angle of outgoing beam is exactly the angle of divergence θ ' of light source S '.Because the LASER Light Source dimension is very little, can regard pointolite as, according to geometrical optics image formula, the outgoing beam angle is:

${\mathrm{\θ}}^{\′}=2{\mathrm{tg}}^{-1}\left[(1-\frac{L}{f})\mathrm{tg}\left(\frac{\mathrm{\θ}}{2}\right)\right]$

According to above-mentioned formula, when lens when the light source S, L reduces, outgoing beam angle θ ' increases, when L was decreased to 0, outgoing beam angle θ ' equaled θ, reached maximum.When lens during away from light source S, L increases, and outgoing beam angle θ ' reduces.Especially, when L increases to when identical with focal length of lens f, be that front focus F that light source S is positioned at lens is when going up, it is minimum that beam divergence angle reaches, though LASER Light Source is very little, but certain dimension is arranged, can not calculate this moment with the following formula formula, the angle of divergence of this moment is big or small and focal length of lens decision by light source, as shown in the formula:

${{\mathrm{\θ}}^{\′}}_{\min }=2{\mathrm{tg}}^{-1}\frac{d}{2f}$

D is the LASER Light Source dimension, and f is the focal length of lens.F is big more as can be seen from the above equation, and the minimum angles that can reach is more little.

When lens continue away from light source S, when surpassing focal point F, the emission light beam becomes have been assembled, and has exceeded scope.So in 0≤L≤f scope, moving of special requirement lens.The light angle variation range is $\mathrm{\θ}\≥{\mathrm{\θ}}^{\′}\≥2{\mathrm{tg}}^{-1}\frac{d}{2f}.$ Big inadequately as maximum angle θ, can also after shaping lens, place concavees lens, further divergent beams.

The present invention proposes and a kind ofly can realize the electronic control of light angle, the semiconductor laser illumination zoom lens control device of wide variation, all optical device all adopt conventional spherical lens, and volume is little, and cost is low, realizes simple.

(4) description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1, Fig. 2 are structural principle synoptic diagram of the present invention;

Fig. 3 is a kind of embodiment of the present invention;

A kind of embodiment of Fig. 4 during for band concavees lens of the present invention.

Among the figure, 1 semiconductor laser, 2 shaping optical devices; light beam after 3 shapings, 4 thin lens groups, 5 outgoing beams; 6 motors, 7 mechanical transmission mechanisms, 12 pairs of gummed spherical lenses; 13 optical filtering cover glasses, 14 turn-screws, 15 direct current generators; 16 lens sleeves, 17 web members, 18 laser instruments protection outer cover; 22 concavees lens, 23 simple lenses.

(5) embodiment

Embodiment 1:

As shown in Figure 1, the light beam that semiconductor laser 1 sends is generally about 10 ° of (level) * 40 ° (vertically), by shaping optical devices 2, level and vertical divergence angle is made into basically identical.After the thin lens group 4 angles compression of light beam 3 through having positive light coke, with outgoing beam 5 outgoing, the emergent light angle is relevant with distance L after the shaping, and L is a distance between light source s and the thin lens group 4.Motor 6 will rotatablely move by mechanical transmission mechanism 7 and be converted to rectilinear motion, and drive lens 4 seesaws, adjustable range L, thereby the shooting angle of control outgoing beam 5.Thin lens group 4 seesaws in the process, guarantees that all the time light source S is positioned on the optical axis of thin lens group 4, and whole optical system is coaxial.

Embodiment 2:

The angle of outgoing beam by shaping after interval L size decision between focal distance f, lens and the light source of angle of divergence θ, lens of light source S.As shown in Figure 2, special, light source S is positioned within the front focus F of lens, becomes virtual image light source S ' behind lens, and the angle of outgoing beam is exactly the angle of divergence θ ' of light source S '.

Embodiment 3:

Fig. 3 is a kind of specific embodiment of the present invention.The semiconductor laser 1 of this embodiment is fixed in lens sleeve 16 inner rear ends by screw, semiconductor laser 1 shaping itself, and the angle of divergence is 30 °.Two gummed spherical lenses 12, focal length 30mm, relative aperture 0.5 is positioned at lens sleeve 16 inside, and slide in front and back therein, and sliding distance and lens sleeve 16 inner length equate.Optical filtering cover glass 13 is fixed in lens sleeve 16 front ends by trim ring.Turn-screw 14 is fixed in lens sleeve 16 bottoms by ball bearing, and right-hand member links to each other with 12V direct current generator 15, and the middle web member 17 that passes through links to each other with cemented doublet 12 fixed frames.Laser instrument protection outer cover 18 is fixed in outside, lens sleeve 16 rear end.

During work, the power lead of direct current generator 15 is linked to each other with controller (the zoom lens control enclosure or the demoder of available routine) control output end mouth, manual or computer control direct current generator 15 rotates forward or backwards, drive cemented doublet 12 by turn-screw 14 and web member 17 and seesaw the about 30mm of move distance.When moving to lens sleeve 16 rear ends, and the distance between the laser instrument is 0.5mm, and when moving to lens sleeve 16 front ends, and distance is 30mm between the laser instrument.Like this, can realize that light angle is 0.5 ° of-20 ° of wide variation.

Embodiment 4:

The semiconductor laser 1 of this embodiment is fixed in lens sleeve 16 inner rear ends by screw, semiconductor laser 1 shaping itself, and the angle of divergence is 20 °.In order to obtain bigger light angle, placed concavees lens 22 behind the laser instrument, focal length is 8mm, can obtain 30 ° Laser emission angle.Simple lens 23, focal length 25mm, relative aperture 0.5 is positioned at lens sleeve 16 inside, therein front and back slip 25mm.Optical filtering cover glass 13 is fixed in lens sleeve 16 front ends by trim ring.Turn-screw 14 is fixed in lens sleeve 16 bottoms by ball bearing, and right-hand member links to each other with 12V direct current generator 15, and the middle web member 17 that passes through links to each other with cemented doublet 12 fixed frames.Laser instrument protection outer cover 18 is fixed in outside, lens sleeve 16 rear end.Can obtain 0.5 °-30 ° the continuous variation range of light angle during this system works.

For mechanical transmission mechanism, can select alternate manner, as cam drive, rack-and-pinion transmission etc. are to obtain more compact structure.

Claims (5)

1. Zooming apparatus of long-distance large-range semiconductor laser lighting device, comprise semiconductor laser (1), it is characterized in that: the front end of described semiconductor laser (1) is provided with shaping optical devices (2) successively, has the thin lens group (4) of positive light coke, light source S after the shaping is positioned on the optical axis of thin lens group (4), and and the interval L between the thin lens group (4) satisfies: 0≤L≤f, wherein f is the focal length of thin lens group (4).

2. Zooming apparatus of long-distance large-range semiconductor laser lighting device according to claim 1, it is characterized in that: the lower end of described thin lens group (4) is provided with one and drives the mechanical transmission mechanism (7) that thin lens group (4) seesaws, and mechanical transmission mechanism (7) is connected with motor (6).

3. Zooming apparatus of long-distance large-range semiconductor laser lighting device according to claim 1 and 2 is characterized in that: the concavees lens of placing further divergent beams between described shaping optical devices (2) and the thin lens group (4).

4. Zooming apparatus of long-distance large-range semiconductor laser lighting device according to claim 1 is characterized in that: described thin lens group (4) is simple lens, cemented doublet or air-spaced doublet.

5. Zooming apparatus of long-distance large-range semiconductor laser lighting device according to claim 2 is characterized in that: described mechanical transmission mechanism (7) is lead screw transmission, rack-and-pinion transmission or cam drive.

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