CN203178574U - Light beam homogenization apparatus for laser night-vision device - Google Patents
Light beam homogenization apparatus for laser night-vision device Download PDFInfo
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- CN203178574U CN203178574U CN 201320237423 CN201320237423U CN203178574U CN 203178574 U CN203178574 U CN 203178574U CN 201320237423 CN201320237423 CN 201320237423 CN 201320237423 U CN201320237423 U CN 201320237423U CN 203178574 U CN203178574 U CN 203178574U
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Abstract
The utility model relates to a light beam homogenization apparatus for a laser night-vision device. The light beam homogenization apparatus comprises a semiconductor laser and a lens set; and a micro lens array, a polygon prism and a piece of ground glass are successively arranged between the semiconductor laser and the lens set. The lens set includes a beam expanding lens and a focusing lens. When the laser emitted by the semiconductor laser is irradiated on the micro lens array, many luminous spots are formed after the laser passes through the micro lens array, wherein each of the luminous spots is equal to a small light source; and all the small light sources pass through the polygon prism and the ground glass and then are mutually overlapped at a distance, thereby realizing spot homogenization and effectively eliminating coherence of the laser beams. The light beam that has been homogenized by homogenization device sets is expanded by the beam expanding lens and is focused by the focusing lens, so that the energy centralization is realized, the irradiation distance is long, the laser speckle phenomenon is eliminated completely, and the image is clear.
Description
Technical field
The utility model relates to a kind of laser night-vision device, specifically, relates to a kind of laser night-vision device light beam homogenizer that becomes the even distribute light in space for the infrared beam that the multimode space distribution is inhomogeneous.
Background technology
Video monitoring system has experienced the simulation epoch, after the development of digital Age, cybertimes, stepped into gradually the high definition epoch now.The high definition monitoring can provide high-definition image, and outstanding picture quality more is conducive to details and observes and the intellectual analysis algorithm.But all these advantages all are based under imaging on daytime or the good situation of illumination, when surround lighting is more weak at night, because the image-forming principle of high-definition camera has determined that its low-light (level) is poor, therefore, monitoring image does not reach high-definition effect at all, even effective not as good as traditional analog video camera, the application at night of high definition monitoring is had a greatly reduced quality.
Laser night vision system is paid attention to by increasing people just gradually as a kind of emerging technology, the sharpest edges that laser is used in lighting field are that laser has high luminescence efficiency and luminous intensity, the electro-optical efficiency of semiconductor laser reaches as high as 80%, cut down the consumption of energy greatly, increase illumination distances, and because the selectivity of the control technology of laser makes the life-span of laser product guarantee to some extent.
At present, the most basic laser night vision system by semiconductor laser as light source, because there is the characteristic of energy Gaussian distribution (being that light energy distribution is inhomogeneous) and many transverse modes (being light and dark striped) in semiconductor laser, night is when making a video recording, have light and dark striped in the image in the field of illumination, and the luminous energy intensity of image is successively decreased by middle mind-set edge.
Chinese patent 201210309070.6 discloses a kind of laser beam homogenizer, described laser beam homogenizer comprises semiconductor laser, microlens array and diversing lens, described microlens array is made up of a plurality of lenticules, this microlens array is positioned on the luminous light path of laser instrument, described diversing lens is positioned at after the microlens array and is positioned on the luminous light path of semiconductor laser and microlens array, described laser beam homogenizer can evenly be launched laser beam, be significantly improved aspect even at hot spot, the laser energy decay is low, and realizes that difficulty is little.
Chinese patent 201120384585.3 discloses a kind of laser illuminator that adopts the homogenize of many frostings frosted glass, described laser illuminator, comprise semiconductor laser, homogenizer and lens combination, described semiconductor laser is used for emissive lighting laser, described homogenizer is arranged between described semiconductor laser and the described lens combination, be used for energy distribution homogenising on the vertical plane of laser conduction orientation, described lens combination comprises that wherein said homogenizer is set to two-layer at least frosting for the beam expanding lens that laser beam is expanded with for the focus lamp that laser beam is carried out focus illumination.Described laser illuminator, owing to adopted the technology of two-layer at least frosting homogenize, realized 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, solved to a certain extent because the laser speckle defective that the high coherence of laser produces, promoted make a video recording at the night effect in field of infrared laser light filling, image definition is improved.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem, and laser speckle is eliminated not thorough, the image definition deficiency.
The utility model content
The technical problems to be solved in the utility model is at above deficiency, a kind of laser night-vision device light beam homogenizer is provided, having overcome in the prior art laser speckle eliminates not thorough, the image definition defect of insufficient, after adopting beam homogenization device of the present utility model, have laser speckle and eliminate thoroughly the advantage of clear picture.
For solving above technical matters, the utility model is by the following technical solutions: a kind of laser night-vision device light beam homogenizer, it is characterized in that: described beam homogenization device comprises semiconductor laser and lens combination, is disposed with microlens array, polygon prism and frosted glass on the luminous light path of the semiconductor laser between semiconductor laser and the lens combination;
Described lens combination comprises beam expanding lens and the focus lamp that is positioned on the luminous light path of semiconductor laser.
A kind of prioritization scheme, described microlens array comprises several lenticules.
Another kind of prioritization scheme, described polygon prism adopts polygon prism or conscope.
Another prioritization scheme, described beam expanding lens is between frosted glass and focus lamp.
After the utility model adopts above technical scheme, compared with prior art, have the following advantages: comprise semiconductor laser and lens combination, be provided with the homogenize set of devices between semiconductor laser and the lens combination, the homogenize set of devices comprises the microlens array that sets gradually, polygon prism and frosted glass, described lens combination comprises beam expanding lens and focus lamp, when the laser that semiconductor laser sends shines on the microlens array, through forming a lot of luminous luminous points behind the microlens array, each luminous luminous point is equivalent to a little light source, each little light source is through overlapping mutually a long way off after polygon prism and the frosted glass then, thereby realize the hot spot homogenize, effectively overcome the coherence of laser beam, expand focusing with focus lamp through beam expanding lens again through the light beam after the homogenize of homogenize set of devices, thereby can realize that energy is more concentrated, irradiation distance is farther, laser speckle is eliminated thoroughly, clear picture.
Below in conjunction with drawings and Examples the utility model is elaborated.
Description of drawings
Accompanying drawing 1 is the structured flowchart of beam homogenization device among the utility model embodiment.
Embodiment
Embodiment, as shown in Figure 1, a kind of laser night-vision device light beam homogenizer, comprise semiconductor laser and lens combination, be provided with the homogenize set of devices between semiconductor laser and the lens combination, described semiconductor laser is used for sending the laser that the illumination light filling is used, described homogenize set of devices comprises the microlens array that sets gradually, polygon prism and frosted glass, described microlens array is made up of a plurality of lenticules, described polygon prism adopts polygon prism or conscope, polygon prism is selected for use one or more, described frosted glass is selected for use one or more, described homogenize set of devices is used for laser that noise spectra of semiconductor lasers sends carries out the energy homogenize and handles, and described lens combination comprises for the beam expanding lens that laser beam is expanded and is used for laser beam is carried out the focus lamp of focus illumination.
Described microlens array is positioned on the luminous light path of semiconductor laser, described polygon prism is positioned at after the microlens array and is positioned on the luminous light path of semiconductor laser, described frosted glass is positioned at after the polygon prism and is positioned on the luminous light path of semiconductor laser, when the laser that semiconductor laser sends shines on the microlens array, through forming a lot of luminous luminous points behind the microlens array, each luminous luminous point is equivalent to a little light source, each little light source is through overlapping mutually a long way off after polygon prism and the frosted glass then, thereby realize the hot spot homogenize, effectively overcome the coherence of laser beam.
Described beam expanding lens is positioned at after the frosted glass and is positioned on the luminous light path of semiconductor laser, described focus lamp is positioned at after the beam expanding lens and is positioned on the luminous light path of semiconductor laser, expand focusing more earlier through the laser after the homogenize of homogenize set of devices, thereby can realize that energy is more concentrated, irradiation distance is farther.
The above is giving an example of the utility model preferred forms, and the part of wherein not addressing in detail is those of ordinary skills' common practise.Protection domain of the present utility model is as the criterion with the content of claim, and any equivalent transformation that carries out based on technology enlightenment of the present utility model is also within protection domain of the present utility model.
Claims (4)
1. laser night-vision device light beam homogenizer, it is characterized in that: described beam homogenization device comprises semiconductor laser and lens combination, is disposed with microlens array, polygon prism and frosted glass on the luminous light path of the semiconductor laser between semiconductor laser and the lens combination;
Described lens combination comprises beam expanding lens and the focus lamp that is positioned on the luminous light path of semiconductor laser.
2. a kind of laser night-vision device light beam homogenizer as claimed in claim 1, it is characterized in that: described microlens array comprises several lenticules.
3. a kind of laser night-vision device light beam homogenizer as claimed in claim 1, it is characterized in that: described polygon prism adopts polygon prism or conscope.
4. as one of them described a kind of laser night-vision device light beam homogenizer of claim 1-3, it is characterized in that: described beam expanding lens is between frosted glass and focus lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237423 CN203178574U (en) | 2013-05-06 | 2013-05-06 | Light beam homogenization apparatus for laser night-vision device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237423 CN203178574U (en) | 2013-05-06 | 2013-05-06 | Light beam homogenization apparatus for laser night-vision device |
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| Publication Number | Publication Date |
|---|---|
| CN203178574U true CN203178574U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320237423 Expired - Lifetime CN203178574U (en) | 2013-05-06 | 2013-05-06 | Light beam homogenization apparatus for laser night-vision device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105404079A (en) * | 2014-09-09 | 2016-03-16 | 山东华光光电子有限公司 | Semiconductor laser lighting module with multiple divergence angles |
| CN105759444A (en) * | 2016-05-10 | 2016-07-13 | 中国科学技术大学 | Static speckle removal device based on lens array and laser projector |
-
2013
- 2013-05-06 CN CN 201320237423 patent/CN203178574U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105404079A (en) * | 2014-09-09 | 2016-03-16 | 山东华光光电子有限公司 | Semiconductor laser lighting module with multiple divergence angles |
| CN105759444A (en) * | 2016-05-10 | 2016-07-13 | 中国科学技术大学 | Static speckle removal device based on lens array and laser projector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |