CN202330967U

CN202330967U - Laser illumination device of laser light filling and homogenizing

Info

Publication number: CN202330967U
Application number: CN2011204362569U
Authority: CN
Inventors: 庄敏
Original assignee: Shenzhen Protruly Electronic Co Ltd
Current assignee: Shenzhen Toyani Special Equipment Technology Co Ltd
Priority date: 2011-11-07
Filing date: 2011-11-07
Publication date: 2012-07-11
Anticipated expiration: 2021-11-07

Abstract

The utility model discloses a laser illumination device of laser light filling and homogenizing, which comprises a semiconductor laser device, a homogenizing device and a lens set, wherein the semiconductor laser device is used for transmitting lasers for illumination; the homogenizing device is used for homogenizing energy distribution on the vertical plane at the laser transmission conduction direction; the lens set at least comprises a beam expanding lens and a focusing lens which are used for expanding beams and focusing lasers for illumination, wherein a vibration or rotary device is arranged and is used for keeping the relative vibration or rotation among at least two of the semiconductor laser device, the homogenizing device and the lens set, and the vibration and rotation period is less than or equal to the electronic shutter time of a camera. According to the laser illumination device of laser light filling and homogenizing provided by the utility model, because the vibration or rotation homogenizing method and the laser illumination device are adopted, light and shade strip patterns in images and the laser speckle phenomenon in the images are eliminated.

Description

The laser illuminator system of a kind of laser light filling homogenize

Technical field

The utility model relates to a kind of image capturing system servicing unit, and the laser illuminator system of laser light filling homogenize improves in particular a kind of infrared laser shooting process.

Background technology

In the prior art, along with the development of camera technique at night, requiring of infrared laser light filling (or claiming the infrared laser illumination) is increasingly high, and most in the market employing semiconductor laser lightings carry out the infrared photography light filling.

Because there is the uneven defective of light energy distribution in semiconductor laser; Generally adopt all kinds of light beam dispensers or optical fiber that laser beam is carried out homogenize in the market; But because the high coherence of laser itself; Though the part light and shade striped in above-mentioned all homogenizing methods or the device meeting removal of images all can produce serious laser speckle (promptly having regional light and shade problem of non-uniform), has a strong impact on the sharpness of institute's image recording.

Do not have the thoroughly effective homogenizing method or the device of eliminate laser speckle in the market, therefore, prior art awaits to improve and development.

The utility model content

The purpose of the utility model is to provide the laser illuminator system of a kind of laser light filling homogenize; Can solve because the defective of laser speckle (being that the staggered brightness irregularities situation of light and shade appears in the light projection surface) appears in the image recording at night that high coherence brought of laser; Make image more clear, thoroughly eliminate laser speckle.

The technical scheme of the utility model is following:

The laser illuminator system of a kind of laser light filling homogenize, it comprises the semiconductor laser instrument, and a homogenizer and a lens combination;

Said semiconductor laser is used for the emission irradiation and uses laser; Said homogenizer is used for energy distribution homogenising on the vertical plane of laser conduction orientation; And a lens combination, comprise beam expanding lens and focus lamp at least, be respectively applied for to expand bundle and focus on irradiation and use laser; Wherein,

Also be provided with a vibration or a wheelwork, be used for keeping vibrating relatively or rotating of said semiconductor laser, homogenizer and said lens combination three at least between the two, and the cycle of its vibration or rotation be smaller or equal to the electronic shutter time of video camera.

Described laser illuminator system, wherein, said semiconductor laser adopts the laser diode of laser diode or the output of band optical fiber.

Described laser illuminator system, wherein, said homogenizer adopts at least a in optical fiber, frosted glass, multifaceted prism and the sieve aperture.

Described laser illuminator system, wherein, said vibration or wheelwork are arranged on the arbitrary device in said laser instrument, homogenizer or the lens combination.

The laser illuminator system of a kind of laser light filling homogenize that the utility model provided; Because the homogenizer that has adopted vibration or rotated; Realized simultaneously the elimination of light and shade striped in the image and the laser speckle phenomenon in the image; Make image need not to increase the sharpening of having realized image under the too expensive prerequisite, reached the actual market requirement of product.The utility model has solved fully because the laser speckle defective that high coherence produced of laser, has greatly promoted make a video recording at the night effect in field of infrared laser light filling, makes the image more clear.

Description of drawings

Fig. 1 is the structure function synoptic diagram of the laser illuminator system preferred embodiment of the utility model laser light filling homogenize.

What Fig. 2 a, Fig. 2 b and Fig. 2 c illustrated respectively is the laser illuminator system principle of work synoptic diagram of the utility model laser light filling homogenize.

Fig. 3 is the laser illuminator system principle schematic of the utility model laser light filling homogenize.

Fig. 4 is the preferred embodiment synoptic diagram of the laser illuminator system of the utility model laser light filling homogenize.

One two field picture of being shot with video-corder when the no homogenize that Fig. 5 a, Fig. 5 b and Fig. 5 c are respectively prior art is handled and the image recording effect when adopting light beam dispenser, optical fiber homogenizer respectively.

Fig. 5 d is the laser illuminator system image recording effect of the utility model laser light filling homogenize.

Fig. 6 is the experimental provision synoptic diagram of the laser illuminator system of the utility model laser light filling homogenize.

Embodiment

Below in conjunction with accompanying drawing, will carry out more detailed explanation to each preferred embodiment of the utility model.

The laser illuminator system of the laser light filling homogenize of the utility model; As shown in Figure 1, be the complete light path theory of constitution figure of laser illuminator, wherein A is a semiconductor laser; Comprise the laser diode of laser diode, the output of band optical fiber etc., be used for sending the laser of irradiation; B is a homogenizer, comprises at least a in optical fiber, frosted glass, multifaceted prism and the sieve aperture etc., is used for that laser is carried out the energy homogenize and handles; C is a lens combination, and its composition comprises beam expanding lens, focus lamp etc., is used for respectively irradiation is expanded bundle and focused on processing with laser; It is noted that, in the said lens combination of the utility model preferably set-up mode be beam expanding lens preceding, focus lamp after, promptly need to expand bundle earlier and focus on again.

Be provided with a vibration or a wheelwork in the utility model preferred embodiment simultaneously; As shown in Figure 1; This vibration or wheelwork are more in the implementation of prior art; For example can adopt the eccentric wheel interlock of motor driven, perhaps rotate through motor driven, for example can gear drive or belt gear etc.The utility model is through vibration or wheelwork vibration or rotates at least one among A, B, the C; Make and produce relative motion at least between the two among the three; Make irradiation is carried out further homogenize processing with laser; Thereby the laser light and shade zone fast crosstalk that is superimposed upon on the light projection surface is changed, so that the every bit on the light projection surface is all projected equably within a certain period of time.

Suppose that the video camera electronic shutter time that is used for shooting with video-corder is T; And said vibration or wheelwork to keep the cycle of the relative motion at least between the two in A, B, three parts of C be t, i.e. the assembly of relative motion returns the used time of initial position once more by the motion of initial position generating period property.When satisfying t≤T, camera acquisition to laser light filling image because the staggered accumulation stack in light and shade zone all becomes fully evenly the brightness in any zone, so the not fogging clear defective that causes of eliminate laser speckle fully.

Therefore; The laser illuminator system of the utility model laser light filling homogenize can solve owing to laser speckle defective in the image recording that high coherence produced of laser fully; Greatly promoted make a video recording at the night effect in field of infrared laser light filling, made the image more clear.

Shown in Fig. 2 a and Fig. 2 b; When among A, B, the C relative motion takes place at least between the two the time; Will make staggered variation the in laser speckle light and shade zone that is superimposed upon on the light projection surface; Shown in Fig. 2 c, so at a complete relative motion cycle t in the time, laser speckle is in the variation that will take place on the light projection surface shown in Fig. 2 a to Fig. 2 c: the laser speckle distribution schematic diagram of half period before being relative motion shown in Fig. 2 a; Fig. 2 b is the laser speckle distribution schematic diagram of half period after the relative motion; It shown in Fig. 2 c the accumulation stack of the laser speckle field in the complete t time in relative motion cycle.When t≤T, the utility model can solve the not fogging clear defective that laser speckle causes.

Adopt the principle of work of the utility model,, the technique effect of the preferred embodiment of the utility model is described to be example only to vibration or rotation homogenizer.

As shown in Figure 3, what semiconductor laser 110 was corresponding in the laser illuminator system of the utility model laser light filling homogenize is the A part among Fig. 1, and what homogenizer 120 was corresponding is the B part among Fig. 1; What beam expanding lens 131 and condenser lens 132 were corresponding is the C part lens combination among Fig. 1; Dash area below said homogenizer 120 is illustrated as vibration or wheelwork 140 simultaneously; This vibration or wheelwork realize adopting common vibrating motor or revolution driving mechanism at present; For example gear or belt drives; Through vibration or rotation homogenizer, to eliminate the laser speckle in the video camera institute images acquired.

As shown in Figure 4; In the laser illuminator system of the utility model laser light filling homogenize one is than specific embodiment; Said semiconductor laser 110 has been arranged on the end of a cartridge type shell 210; In the tube chamber 211 of this cartridge type shell 210, be disposed with a homogenizer 120 and a lens combination 130; Below this homogenizer 120, be provided with a vibrating device 140, concrete can be to drive said homogenizer 120 through vibrating motor, and this homogenizer 120 passes through a vibrating spring 121 flexible fastenings in said tube chamber 211.

As shown in Figure 6 is the utility model Experimental equipment, and wherein laser instrument 110, homogenizer 120 and lens combination 130 set gradually and form an optical system, and a vibrating device 140 is set below said homogenizer 120.What said homogenizer 120 adopted here is frosted glass.What laser instrument 110 wherein was corresponding is the A part among Fig. 1; What homogenizer 120 was corresponding is the B part among Fig. 1; What lens combination was corresponding is the C part among Fig. 1; Through the vibration homogenizer, experimental result shows, has eliminated the defective of laser speckle really.

In the preferred embodiment of the homogenizing method of the utility model laser light filling; Utilize above-mentioned vibration or wheelwork to realize vibrating relatively arbitrarily or rotate among laser instrument, homogenizer and the lens combination three between the two exactly; The cycle of its vibration or rotation is less than or equal to the aperture time of video camera; The process that the laser that so just can realize laser illumination is gone out carries out rapid homogenize guarantees the uniform irradiation of light and shade luminance area, eliminates the laser speckle in the video camera image recording.

It shown in Fig. 5 a to Fig. 5 d the treatment effect contrast synoptic diagram of the laser illuminator system of each processing mode of prior art and the homogenize of the utility model laser light filling.Prior art is not when carrying out any processing, and shown in Fig. 5 a, its image is extremely unintelligible and the light and shade striped is very obvious; Shown in Fig. 5 b and Fig. 5 c; Be the image after employing light beam dispenser (like frosted glass) homogenize or the optical fiber homogenize, its light and shade striped makes moderate progress, but the laser speckle phenomenon is serious; Therefore only can eliminate part light and shade striped in the prior art; But because laser itself has the coherence, it is not considered or realizes the elimination problem to laser speckle, causes the impracticable of the technology of shooting with video-corder present night.Shown in Fig. 5 d, be the image after employing the utility model (like vibration frosted glass) homogenize, its clear no significant defect has reached the requirement of practicability.

Above experiment effect image is still image, but its contrast effect is very obvious, in the application of reality, and contrast dynamic video effect, the homogenize technique effect of the utility model is then more outstanding.

Should be understood that above-mentioned description to the utility model preferred embodiment is comparatively concrete, can not therefore think the restriction to the utility model scope of patent protection, the scope of patent protection of the utility model should be as the criterion with accompanying claims.

Claims

1. the laser illuminator system of laser light filling homogenize, it comprises the semiconductor laser instrument, and a homogenizer and a lens combination;

Said semiconductor laser is used for the emission irradiation and uses laser; Said homogenizer is used for energy distribution homogenising on the vertical plane of laser conduction orientation; And a lens combination, comprise beam expanding lens and focus lamp at least, be respectively applied for to expand bundle and focus on irradiation and use laser; It is characterized in that,

2. laser illuminator system according to claim 1 is characterized in that, said semiconductor laser adopts the laser diode of laser diode or the output of band optical fiber.

3. laser illuminator system according to claim 1 is characterized in that, said homogenizer adopts at least a in optical fiber, frosted glass, multifaceted prism and the sieve aperture.

4. laser illuminator system according to claim 1 is characterized in that, said vibration or wheelwork are arranged on the arbitrary device in said laser instrument, homogenizer or the lens combination.