LV15649B - Device for particle adhesion prevention on optical element surfaces - Google Patents
Device for particle adhesion prevention on optical element surfaces Download PDFInfo
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- LV15649B LV15649B LVP-20-88A LVP2020000088A LV15649B LV 15649 B LV15649 B LV 15649B LV P2020000088 A LVP2020000088 A LV P2020000088A LV 15649 B LV15649 B LV 15649B
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Description
IZGUDROJUMA APRAKSTSDESCRIPTION OF THE INVENTION
[001] Izgudrojums attiecas uz optikas nozari, konkrētāk lāzertehnoloģijām, vēl konkrētāk uz lēcu un citu optisku elementu aizsardzību.[001] The invention relates to the field of optics, more specifically to laser technologies, more specifically to the protection of lenses and other optical elements.
Zināmais tehnikas līmenisThe known state of the art
[002] Stiklu un lēcu tīrības uzturēšanai optiskajām sistēmām pielieto vairākas metodes, piemēram, tvaiku un putekļu nosūkšanas sistēmas (piem. https://www.ult.de/en/products-andservices/process-solutions/laser-smoke/cartridge-filter/las-2500-laser-fume-and-dustextractor.html) vai virzītu saspiestā gaisa plūsmu griešanas lāzeriem (https://www.troteclaser.com/en/knowledge/tips-for-laser-users/selection-nozzle/). Bet šīs metodes nav piemērotas, lai uzturētu tīru lāzera lēcu, kurai ir liels virsmas laukums un caur kuru tiek virzīts lāzera stars, piemēram, lāzerravēšanas iekārtās, veicot augu apstrādi ar lāzeri, un vienlaikus pārvietojot lēcas tiešā tuvumā augsnei. Putekļi vēja ietekmē var lidot un nonākt uz lēcā ar kurām tiek uzņemts attēls vai vadīts lāzers. Uzņemot attēlus, putekļi un citas sīkas daļiņas var radīt attēlu kropļojumus. Uz lāzera lēcas putekļi var radīt mazāku gaismas caurlaidību, kā arī lāzera stara ietekmē sabojāt lēcas virsmu neatgriezeniski.[002] Optical systems use several methods to keep glasses and lenses clean, such as steam and dust extraction systems (e.g. https://www.ult.de/en/products-andservices/process-solutions/laser-smoke/cartridge- filter/las-2500-laser-fume-and-dustextractor.html) or directed compressed air flow for cutting lasers (https://www.troteclaser.com/en/knowledge/tips-for-laser-users/selection-nozzle/ ). But these methods are not suitable for keeping clean a laser lens that has a large surface area through which the laser beam is directed, such as in laser weeding machines, when lasering plants while moving the lenses in close proximity to the soil. Dust can fly under the influence of the wind and end up on the lens with which the image is captured or the laser is guided. When taking pictures, dust and other small particles can distort the pictures. Dust on the laser lens can cause less light transmission, as well as damage the surface of the lens permanently under the influence of the laser beam.
[003] CNC tipa lāzergriešanas iekārtās parasti izmanto maza izmēra (diametrā 5 mm - 20 mm) lēcas lāzera stara fokusēšanai uz materiāla griešanas virsmu. Sajās iekārtās lēcas aizsardzībai izmanto piltuves veida sprauslu, kur vienā pusē ir atvērums izejošajam lāzera staram, bet pretējā pusē slēgti atrodas lēcas virsma. Piltuvē, pievadot saspiesto gaisu, tas izkļūst pa atvērto piltuves galu, tādā veidā nepieļaujot daļiņu nokļūšanu uz lēcas virsmas. Pēc šāda principa lielām lēcām, ar diametru 35 mm un lielākām būtu nepieciešamas lielas sprauslas un liels saspiestā gaisa daudzums, kā arī tiktu radīta liela gaisa plūsma uz ar lāzeru apstrādājamo objektu.[003] CNC type laser cutting machines usually use small lenses (diameter 5 mm - 20 mm) to focus the laser beam on the cutting surface of the material. In these devices, a funnel-shaped nozzle is used to protect the lens, where on one side there is an opening for the outgoing laser beam, and on the opposite side the surface of the lens is closed. When compressed air is introduced into the funnel, it escapes through the open end of the funnel, thus preventing particles from reaching the surface of the lens. According to this principle, large lenses, 35 mm in diameter and larger, would require large nozzles and a large amount of compressed air, and would create a large air flow to the object to be lasered.
[004] Mazās CNC lāzeriekārtās vēl tiek izmantoti ventilatori, kas veido virzītu gaisa plūsmu lāzera stara virzienā, tādā veidā kavējot putekļu un tvaika nokļūšanu uz lāzera lēcas. Šis risinājums nodrošina tikai ļoti sīku daļiņu (dūmu) novirzīšanu no lēcas virmas.[004] Small CNC laser machines still use fans, which create a directed air flow in the direction of the laser beam, thus preventing dust and steam from reaching the laser lens. This solution ensures that only very small particles (smoke) are diverted from the surface of the lens.
[005] Apstrādājot augus ar lāzeri, uz lauksamniecības zemes, iepriekš minētie lēcu aizsardzības risinājumi nav piemēroti. Tie veido lielu gaisa plūsmu uz lāzera apstrādes virmas, kas paceļ gaisā augsnes daļiņas. Ari apstrādājamie augi gaisa plūsmas ietekme sāk svārstīties un traucē precīzai auga apstrādei.[005] When treating plants with a laser, on agricultural land, the above-mentioned lens protection solutions are not suitable. They create a large air flow on the laser treatment surface, which lifts the soil particles into the air. Also the plants to be processed, the effect of the air flow starts to fluctuate and interferes with the precise processing of the plant.
Izgudrojuma mērķis un būtībaPurpose and essence of the invention
[006] Piedāvātais izgudrojums apraksta risinājumu, kas aizsargā relatīvi lielus (35 mm un lielāki) optiskos elementus (to lēcas, aizsargstiklus) no mazām daļiņām, piemēram, bet ne tikai: putekļi, tvaiki, augsnes daļiņas, smilšu graudi un vienlaikus nerada papildus gaisa plūsmu uz apstrādājamo objektu.[006] The proposed invention describes a solution that protects relatively large (35 mm and larger) optical elements (their lenses, protective glasses) from small particles, for example, but not limited to: dust, steam, soil particles, sand grains and at the same time does not create additional air flow to the processed object.
[007] Problēma, kas tiek risināta: kā pasargāt optisko elementu (piemēram, bet ne tikai: lēcu, fotokameras aizsargstikliņu) no daļiņu adhēzijas vienlaikus neradot gaisa plūsmu tajā pat virzienā, uz kuru optiskais elements ir pavērsts (darba virziens). Risinājumam tiek izmantots virzītas gaisa plūsmas avots - centrbēdzes ventilators ar augstu gaisa plūsmas ražību. Gaisa plūsma tiek vadīta pa īpaši izveidotu kanālu, kurā ir iestiprināts optiskais elements tā, ka gaisa plūsma pārvietojas paralēli tā darba virsmai (lēcai, stiklam). Tieši pretī lēcai vai stiklam tunelī izveidots otrs atvērums - optiskā elementa darba (attēla uzņemšanas vai lāzera apstrādes) diapazona lielumā.[007] Problem to be solved: how to protect an optical element (eg, but not limited to: lens, protective glass of a camera) from particle adhesion while not creating an air flow in the same direction that the optical element is facing (working direction). The solution uses a source of directed air flow - a centrifugal fan with high air flow productivity. The air flow is guided through a specially created channel in which the optical element is fixed so that the air flow moves parallel to its working surface (lens, glass). Directly opposite the lens or glass, a second opening is created in the tunnel - in the size of the working range of the optical element (image capture or laser processing).
[008] Kanāla turpinājums tiek veidots tik tālu, lai izvadītu virzīto gaisa plūsmu ārā no sistēmas tādā attālumā, kurā tas vairs netraucē optiskā elementa darbībai, piemēram, lāzera apstrādei vai attēlu uzņemšanai. Lai nodrošinātu tīra gaisa padevi, ventilatora gaisa iesūci var aprīkot ar atbilstošas klases daļiņu filtru. Kanāla konstrukcija nodrošina to, ka neliela daļa (0,1-5%) no gaisa plūsmas turpina ceļu ārā no kanāla caur atvērumu kurš atrodas pretī lēcai, tādā veidā virzot daļiņu kustību prom no lēcas darba atvēruma un lēcas. Ja lēcas darba atvērumā ielido kāda no daļiņām, tad virzītā gaisa plūsma šo daļiņu virza uz kanāla izvadu, tādā veidā nepieļaujot tās adhēziju uz lēcas skat. 1.zīm.[008] The continuation of the duct is formed far enough to lead the directed airflow out of the system at a distance where it no longer interferes with the operation of the optical element, such as laser processing or imaging. To ensure a clean air supply, the fan air intake can be equipped with a particle filter of the appropriate class. The design of the channel ensures that a small part (0.1-5%) of the air flow continues its way out of the channel through the opening opposite the lens, thus directing the movement of particles away from the working opening of the lens and the lens. If any of the particles fly into the working opening of the lens, then the directed air flow directs this particle to the outlet of the channel, thus preventing its adhesion to the lens, see Fig. 1
Izgudrojuma īstenošanas piemēriExamples of implementation of the invention
[009] Piemērs. Lai aizsargātu F-Theta lēcu ar diametru 80 mm, caur kuru tiek virzīts lāzera stars tiek izmantots polimēra materiāla (piemēram, bet ne tikai: PVC, PE, PP) kanāls, veidots atbilstoši iepriekš aprakstītajam paņēmienam, skat. 2. zīm. Kanālam ir šādi galvenie elementi: 1 - atvērums lēcas pievienojumam; 2 - darba atvērums lēcas funkcijas nodrošināšanai; 3 - atvērums ventilatora pieslēgumam; 4 - atvērums gaisa plūsmas aizvadīšanai. Kanāla izmēri veidoti tā, lai ņemot vērā darba atvēruma izmērus un izmantotā ventilatora jaudu, tiku nodrošināts pietiekošs spiediens (70 000 Pa vai lielāks) un gaisa plūsma (vismaz 150 m3/h), un tādā veidā nepieļautu 0,5 mm un mazāku augsnes daļiņu adhēziju uz lēcas virsmas. Tiek izmantots centrbēdzes ventilators, kas veido lamināru gaisa plūsmu ar ražību 200 m3/h un lēca atrodas 300 mm attālumā no daļiņu avota. 0,5 mm izmēra smilšu graudi, kas virzās augšup uz lēcu ar ātrumu 2,7 m/s un mazāku tiek aizpūsti prom no lēcas.[009] Example. To protect the F-Theta lens with a diameter of 80 mm, through which the laser beam is guided, a channel of polymer material (for example, but not limited to: PVC, PE, PP) is used, made according to the technique described above, see Fig. 2 The channel has the following main elements: 1 - opening for lens attachment; 2 - working opening to ensure the function of the lens; 3 - opening for fan connection; 4 - opening for air flow. The dimensions of the channel are designed in such a way that, taking into account the dimensions of the working opening and the power of the fan used, sufficient pressure (70,000 Pa or more) and air flow (at least 150 m 3 /h) were provided, and thus preventing 0.5 mm and less soil particle adhesion on the lens surface. A centrifugal fan is used, creating a laminar air flow with a capacity of 200 m 3 /h and the lens is located 300 mm from the particle source. A 0.5 mm grain of sand moving up the lens at 2.7 m/s or less is blown away from the lens.
Claims (5)
Priority Applications (1)
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LVP-20-88A LV15649B (en) | 2020-12-07 | 2020-12-07 | Device for particle adhesion prevention on optical element surfaces |
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LVP-20-88A LV15649B (en) | 2020-12-07 | 2020-12-07 | Device for particle adhesion prevention on optical element surfaces |
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LV15649A LV15649A (en) | 2022-06-20 |
LV15649B true LV15649B (en) | 2022-11-20 |
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LVP-20-88A LV15649B (en) | 2020-12-07 | 2020-12-07 | Device for particle adhesion prevention on optical element surfaces |
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Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002229110A (en) * | 2001-01-31 | 2002-08-14 | Olympus Optical Co Ltd | Camera |
US6890080B2 (en) * | 2002-01-25 | 2005-05-10 | Ircon, Inc. | Air purge system for optical sensor |
DE10305258A1 (en) * | 2002-02-08 | 2003-08-21 | Creo Inc | Optical element protection device for laser imaging e.g. on lithographic plates, has flow collimation element arranged in path of fluid source |
DE10225151A1 (en) * | 2002-06-06 | 2003-12-18 | Bosch Gmbh Robert | Dust deposition prevention device for preventing the deposition of particles on the surface of the sensor of an optical unit, e.g. a video unit, whereby an airflow is created over the sensor surface to prevent deposition |
US20190310470A1 (en) * | 2018-04-10 | 2019-10-10 | Visteon Global Technologies, Inc. | System to maintain a clear lens on a camera |
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