CN101281289A - Automatic focusing method - Google Patents
Automatic focusing method Download PDFInfo
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- CN101281289A CN101281289A CNA2007101145722A CN200710114572A CN101281289A CN 101281289 A CN101281289 A CN 101281289A CN A2007101145722 A CNA2007101145722 A CN A2007101145722A CN 200710114572 A CN200710114572 A CN 200710114572A CN 101281289 A CN101281289 A CN 101281289A
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Abstract
The present invention provides an automatic focus method, using an active mode range measurement method to measure the distance between a projecting lens and a projection screen, and executing focusing alignment to the projector equipment based on the distance. The method includes measuring the distance between the projecting lens and screen; determining the focal distance of the projecting lens based on the distance between the projecting lens and screen; and regulating the projecting lens based on the determined focal distance. Compared with the prior technology, the invention provides an automatic focus method which can automatically, accurately and conveniently regulate focal distance of lens, and can obtain a clear image without affect from the ambient light.
Description
Technical field
The present invention relates to a kind of auto focusing method, relate to a kind of auto focusing method that is used for projector equipment more specifically.
Background technology
Along with the raising day by day of living standard and the continuous development of video technique, the projection video product also more and more causes the concern in market.At present, though be portable small-business demonstration, multimedia conferencing chamber, classroom, stadiums, church, commercial location, large-scale auditorium all may use the projection video product, some virtual demonstration even arrive the jumbotron optical projection system of cinema greatly, they otherwise adopt before the throwing mode, or adopt the rear-projection mode.Throwing before so-called, briefly, is exactly the installation site and the homonymy of spectators at screen of projector equipment, and the ray cast that projector equipment sends arrives screen, forms image on screen, and light reflexes to eye more then.The preceding screen of throwing can be made arbitrary dimension, and the advantage of preceding throwing is only to throw screen before one, can do very greatly, just as the screen of cinema.But preceding throwing requires to turn off the bulb of projection chamber, just can obtain the image that seems very comfortable, cans be compared to cinema, and the light that need control environment is highly suitable for having a lot of spectators' darkroom environment.
Because these characteristics of preceding throwing, front projection equipment generally can only focus on adjustment by manual method to it by the visual inspection screen when focusing on, so that its picture is clear.Not only there is defective in this manual focus method mostly based on user's subjective judgement and experience on accuracy, its adjusting itself is also inconvenient.There is a kind of self-focusing method to address this problem, promptly by the passive ranging technology, measure the distance of projection lens and projection screen, come projector equipment is focused on adjustment according to this distance, yet the passive ranging technology is subjected to ambient light interference, the result who measures is often inaccurate, can't fundamentally address this problem.This area is consulted and is treated a kind of self-focusing method, and the focusing process of front projection equipment can be finished automatically.
Summary of the invention
In order to address the above problem, the invention provides a kind of auto focusing method, by active distance-finding method the distance between projection lens and the projection screen is measured, come projector equipment is focused on adjustment according to this distance.
Concrete, the invention provides the auto focusing method of a kind of projector equipment of class, comprising: measure the distance between projection lens and the screen; Determine the focal length of projection lens according to the distance between projection lens and the screen; According to determining good focal length projection lens is regulated.
Distance between above-mentioned measurement projection lens and the screen can be for passing through the distance between laser measurement projection lens and the screen.Described laser can be visible light.
Above-mentionedly determine according to projection lens and the distance between the screen that the focal length of projection lens can comprise the distance between projection lens and the screen is compared with the lens data of storage in advance, determine the focal length of projection lens.
The present invention also provides a kind of projection arrangement, comprise projection lens, screen, distance measuring equipment, controller and focus control, distance measuring equipment is used to measure the distance between projection lens and the screen, and measurement result sent to controller, controller is determined the focal length of projection lens according to this distance, and according to determining that good focal length controls focus control, the control focus control is regulated the focal length of projection lens.
The above distance measuring equipment is a laser range finder, uses visible light to find range.
Above-mentioned controller is compared with the distance between the screen projection lens with the lens data of storage in advance, determine the focal length of projection lens.
Compared with prior art, automatic focusing method provided by the invention can be adjusted lens focus automatically, accurately, easily, is not subjected to the influence of surround lighting, obtains distinct image.
Description of drawings
Figure 1 shows that the synoptic diagram of a projector.
Figure 2 shows that the synoptic diagram of the embodiment of a projector that uses auto focusing method.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can being become apparent more, is example with the projector below, and the present invention is further detailed explanation with embodiment in conjunction with the accompanying drawings.
Figure 1 shows that the synoptic diagram of a projector.Projector 100 comprises projection lens 110 and screen 120.When the relative position of projection lens 110 and screen 120 changed, it was fuzzy to know originally that the image of demonstration may become.If projector 100 adopts the manual focusing mode, when distance changes between reception screen 110 and screen 120, all need user's manual focusing, to guarantee clear picture.
Figure 2 shows that the synoptic diagram of the embodiment of a projector that uses auto focusing method.As shown in the figure, projector 200 also comprises distance measuring equipment 230, controller 240 and focus control 250 except comprising projection lens 210 and screen 220.Distance measuring equipment 230 is used to test the distance between projection lens 210 and the screen 220, and measurement result sent to controller 240, controller 240 is determined the focal length of projection lens 210 according to this distance, and according to determining that good focal length controls focus control 250, the focal length of 250 pairs of projection lens 210 of control focus control is regulated.
Concrete, distance measuring equipment 230 can be a laser range finder, and is preferred for the ease of regulating, it is the interior laser of visible-range that laser range finder adopts wavelength, such as ruddiness, green glow etc.Can when the assembling distance measuring equipment, adjust its radiation direction more easily like this, make it parallel, obtain the distance between viameter and the picture centre accurately with camera lens optical axis.Like this, no matter projector be tilt or just putting, can accurately obtain the distance between optical center on the camera lens optical axis and image.
Wherein, X is the distance that image is arrived in the optical center on the camera lens optical axis direction.
D is on the camera lens optical axis direction, and the distance at airborne laser range finder and projection lens center has positive and negative branch.
L be on the camera lens optical axis direction airborne laser range finder to the distance of image.
Like this, the active laser range finding by distance measuring equipment 230 can accurately obtain the distance between distance measuring equipment 230 on the camera lens optical axis direction and screen 220, and be scaled the distance between projection lens 210 and the screen 220.
Range data between projection lens 210 and the screen 220 has been arranged, and distance measuring equipment 230 can be determined the focal length of projection lens 210 by several different methods.A kind of simple method is to be stored in a form the inside in advance by the corresponding relation with the focal length of distance between projection lens 210 and the screen 220 and projection lens 210, distance measuring equipment 230 is by tabling look-up, current projection lens 210 is compared with the data in the tabulation with the distance between the screen 220, find out the focal length data of corresponding projection lens 210.According to the difference of projection lens, the data in the tabulation also can be different, and these data can be the data that projection lens provider provides, and also can be one group of data calculating.
At last, controller 240 is controlled focus control 250 according to determining good focus data, and the focal length of 250 pairs of projection lens 210 of control focus control is regulated.Focus control 250 can be a motor, also can be other similar propulsion system.And for some projection lens that can focus automatically, 240 need of controller will determine that good focus data sends to projection lens and gets final product, and be regulated automatically by projection lens.That is to say that focus control 250 can be the part of projection lens 210.
User's operation for convenience, projector 200 can also be provided with button on panel, and the user triggers the automatic focusing action by operation push-button.Cause not foggingly when clear when distance between projection lens and the screen changes, press the automatic focusing button on the lower panel, can trigger automatic focusing and move.
Projector 200 also can be provided with by LED light, shows the automatic focusing progress.In order to show the automatic focusing progress more clearly, on the panel of projector 200, LED light is set, the control section of this pilot lamp and controller 240 join, and show the focusing progress by LED light change in color or bright dark variation.
Compared with prior art, Atomatic focusing method provided by the invention can be automatically, accurately, transfer easily Whole lens focus obtains clearly image.
Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited in above-mentioned giving an example, The variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation Or replace, also should belong to protection scope of the present invention.
Claims (10)
1, a kind of auto focusing method of projector equipment comprises:
Measure the distance between projection lens and the screen;
Determine the focal length of projection lens according to the distance between projection lens and the screen;
According to determining good focal length projection lens is regulated.
2, the auto focusing method of projector equipment according to claim 1 is characterized in that: the distance between described measurement projection lens and the screen is for passing through the distance between laser measurement projection lens and the screen.
3, the auto focusing method of projector equipment according to claim 2 is characterized in that: described laser is visible light.
4, according to the auto focusing method of the arbitrary described projector equipment of claim 1-3, it is characterized in that: describedly determine according to projection lens and the distance between the screen that the focal length of projection lens comprises the distance between projection lens and the screen is compared with the lens data of storage in advance, determine the focal length of projection lens.
5, a kind of projection arrangement, comprise projection lens and screen, it is characterized in that: described projection arrangement also comprises distance measuring equipment, controller and focus control, distance measuring equipment, be used to measure the distance between projection lens and the screen, and measurement result is sent to controller, controller is determined the focal length of projection lens according to this distance, and according to determining that good focal length controls focus control, the control focus control is regulated the focal length of projection lens.
6, projection arrangement according to claim 5 is characterized in that: described distance measuring equipment is a laser range finder.
7, projection arrangement according to claim 6 is characterized in that: described laser range finder uses visible light to find range.
8, projection arrangement according to claim 5 is characterized in that: described controller is compared with the distance between the screen projection lens with the lens data of storage in advance, determine the focal length of projection lens.
9, projection arrangement according to claim 5 is characterized in that: described focus control is the part of described projection lens.
10, projection arrangement according to claim 5 is characterized in that: described projection arrangement comprises the focusing button, and described controller is controlled described focusing button, receives the instruction of described focusing button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101145722A CN101281289A (en) | 2007-12-29 | 2007-12-29 | Automatic focusing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101145722A CN101281289A (en) | 2007-12-29 | 2007-12-29 | Automatic focusing method |
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| Publication Number | Publication Date |
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| CN101281289A true CN101281289A (en) | 2008-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101145722A Pending CN101281289A (en) | 2007-12-29 | 2007-12-29 | Automatic focusing method |
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Cited By (31)
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| CN102354079A (en) * | 2011-09-23 | 2012-02-15 | 海信集团有限公司 | Projection device and automatic focusing method |
| CN102385235A (en) * | 2010-08-25 | 2012-03-21 | 亚洲光学股份有限公司 | Projection device with automatic focusing function and automatic focusing method thereof |
| CN102430858A (en) * | 2011-10-10 | 2012-05-02 | 华中科技大学 | Automatic focusing adjustor for laser processing |
| CN102648389A (en) * | 2009-05-19 | 2012-08-22 | 生物纳米基因公司 | Devices and methods for dynamic determination of sample spatial orientation and dynamic repositioning |
| CN103402057A (en) * | 2013-08-07 | 2013-11-20 | 深圳波粒科技股份有限公司 | Camera focusing method and camera |
| CN103424974A (en) * | 2012-05-22 | 2013-12-04 | 宏碁股份有限公司 | Projecting device and focusing method |
| CN103576724A (en) * | 2012-08-08 | 2014-02-12 | 联想(北京)有限公司 | Image acquirer, electronic device and light adjusting method |
| CN103744259A (en) * | 2013-12-25 | 2014-04-23 | 苏州佳世达光电有限公司 | Projection apparatus and projection apparatus light path difference compensation method |
| CN104184977A (en) * | 2013-05-27 | 2014-12-03 | 联想(北京)有限公司 | Projection method and electronic equipment |
| CN104503188A (en) * | 2014-12-31 | 2015-04-08 | 信利光电股份有限公司 | Automatic focusing module and mobile equipment |
| CN104503189A (en) * | 2014-12-31 | 2015-04-08 | 信利光电股份有限公司 | Automatic focusing method |
| CN104536249A (en) * | 2015-01-16 | 2015-04-22 | 深圳市中兴移动通信有限公司 | Method and device for regulating focal length of projector |
| CN104767953A (en) * | 2014-01-08 | 2015-07-08 | 联想(北京)有限公司 | Control method and electronic equipment |
| WO2015131688A1 (en) * | 2014-10-09 | 2015-09-11 | 中兴通讯股份有限公司 | Method and apparatus for automatic projector focusing, and projector |
| CN104935849A (en) * | 2015-06-08 | 2015-09-23 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| WO2016000330A1 (en) * | 2014-06-30 | 2016-01-07 | 中兴通讯股份有限公司 | Focal length adjustment method, device and terminal, and computer storage medium |
| CN105301885A (en) * | 2015-11-30 | 2016-02-03 | 成都市极米科技有限公司 | Focus determining system, focus determining method and remote controller pairing method of projection device |
| CN105444060A (en) * | 2015-12-29 | 2016-03-30 | 佛山市毅丰电器实业有限公司 | Automatic focusing lamp and focusing method thereof |
| CN105721842A (en) * | 2016-04-08 | 2016-06-29 | 北京海尔广科数字技术有限公司 | Projection method and device for robot with projection function as well as robot |
| CN105842972A (en) * | 2016-04-28 | 2016-08-10 | 乐视控股（北京）有限公司 | Method for adjusting projection focal length of projector and projector |
| WO2016145872A1 (en) * | 2015-09-07 | 2016-09-22 | 中兴通讯股份有限公司 | Distance measurement and focusing method and device |
| CN106950782A (en) * | 2017-05-12 | 2017-07-14 | 高树坤 | A kind of method and device for being used to determine screen prjection automatic Proofreading |
| CN107124566A (en) * | 2017-05-27 | 2017-09-01 | 四川长虹电器股份有限公司 | TV with concealed LOGO |
| CN107561841A (en) * | 2017-09-29 | 2018-01-09 | 无锡昊瑜节能环保设备有限公司 | The automatic focusing method of the projecting apparatus adaptively adjusted |
| CN107911690A (en) * | 2017-12-21 | 2018-04-13 | 陕西天和照明设备工程有限公司 | A kind of bore hole 3D projecting methods and system based on pseudo-classic architecture alien invasion |
| CN108513156A (en) * | 2018-03-27 | 2018-09-07 | 深圳市火乐科技发展有限公司 | A kind of control method and device based on Intelligent Laser TV |
| CN108710251A (en) * | 2018-04-20 | 2018-10-26 | 广景视睿科技（深圳）有限公司 | A kind of Atomatic focusing method, device and projecting apparatus |
| CN109188843A (en) * | 2018-10-24 | 2019-01-11 | 泉州市新锐极光科技有限公司 | It is a kind of can auto-focusing ultrashort out-of-focus projection's device and method thereof |
| CN110769234A (en) * | 2019-09-29 | 2020-02-07 | 深圳市火乐科技发展有限公司 | Projector focusing method based on ultrasonic waves, projector and related product |
| US10698308B2 (en) | 2015-04-27 | 2020-06-30 | Zte Corporation | Ranging method, automatic focusing method and device |
| US11204543B2 (en) | 2017-11-30 | 2021-12-21 | Coretronic Corporation | Projection apparatus and auto-focusing method |
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2007
- 2007-12-29 CN CNA2007101145722A patent/CN101281289A/en active Pending
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| CN102648389A (en) * | 2009-05-19 | 2012-08-22 | 生物纳米基因公司 | Devices and methods for dynamic determination of sample spatial orientation and dynamic repositioning |
| CN102648389B (en) * | 2009-05-19 | 2015-04-29 | 生物纳米基因公司 | Devices and methods for dynamic determination of sample spatial orientation and dynamic repositioning |
| CN102385235A (en) * | 2010-08-25 | 2012-03-21 | 亚洲光学股份有限公司 | Projection device with automatic focusing function and automatic focusing method thereof |
| CN102385235B (en) * | 2010-08-25 | 2013-07-24 | 亚洲光学股份有限公司 | Projection device with automatic focusing function and automatic focusing method thereof |
| CN102354079B (en) * | 2011-09-23 | 2013-08-07 | 海信集团有限公司 | Projection device and automatic focusing method |
| CN102354079A (en) * | 2011-09-23 | 2012-02-15 | 海信集团有限公司 | Projection device and automatic focusing method |
| CN102430858B (en) * | 2011-10-10 | 2014-10-29 | 华中科技大学 | Automatic focusing adjustor for laser processing |
| CN102430858A (en) * | 2011-10-10 | 2012-05-02 | 华中科技大学 | Automatic focusing adjustor for laser processing |
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| CN103424974B (en) * | 2012-05-22 | 2015-09-23 | 宏碁股份有限公司 | Projection arrangement and focusing method |
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| CN103744259A (en) * | 2013-12-25 | 2014-04-23 | 苏州佳世达光电有限公司 | Projection apparatus and projection apparatus light path difference compensation method |
| CN104767953A (en) * | 2014-01-08 | 2015-07-08 | 联想(北京)有限公司 | Control method and electronic equipment |
| WO2016000330A1 (en) * | 2014-06-30 | 2016-01-07 | 中兴通讯股份有限公司 | Focal length adjustment method, device and terminal, and computer storage medium |
| CN105573041A (en) * | 2014-10-09 | 2016-05-11 | 中兴通讯股份有限公司 | Method and device for realizing automatic focusing of projector, and projector |
| WO2015131688A1 (en) * | 2014-10-09 | 2015-09-11 | 中兴通讯股份有限公司 | Method and apparatus for automatic projector focusing, and projector |
| CN104503189A (en) * | 2014-12-31 | 2015-04-08 | 信利光电股份有限公司 | Automatic focusing method |
| CN104503188A (en) * | 2014-12-31 | 2015-04-08 | 信利光电股份有限公司 | Automatic focusing module and mobile equipment |
| CN104536249A (en) * | 2015-01-16 | 2015-04-22 | 深圳市中兴移动通信有限公司 | Method and device for regulating focal length of projector |
| CN104536249B (en) * | 2015-01-16 | 2016-08-24 | 努比亚技术有限公司 | The method and apparatus of regulation projector focal length |
| US10698308B2 (en) | 2015-04-27 | 2020-06-30 | Zte Corporation | Ranging method, automatic focusing method and device |
| CN104935849A (en) * | 2015-06-08 | 2015-09-23 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN106502031A (en) * | 2015-09-07 | 2017-03-15 | 中兴通讯股份有限公司 | Range finding, focusing process method and device |
| WO2016145872A1 (en) * | 2015-09-07 | 2016-09-22 | 中兴通讯股份有限公司 | Distance measurement and focusing method and device |
| CN105301885A (en) * | 2015-11-30 | 2016-02-03 | 成都市极米科技有限公司 | Focus determining system, focus determining method and remote controller pairing method of projection device |
| CN105444060A (en) * | 2015-12-29 | 2016-03-30 | 佛山市毅丰电器实业有限公司 | Automatic focusing lamp and focusing method thereof |
| CN105721842A (en) * | 2016-04-08 | 2016-06-29 | 北京海尔广科数字技术有限公司 | Projection method and device for robot with projection function as well as robot |
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| CN105842972A (en) * | 2016-04-28 | 2016-08-10 | 乐视控股（北京）有限公司 | Method for adjusting projection focal length of projector and projector |
| CN106950782A (en) * | 2017-05-12 | 2017-07-14 | 高树坤 | A kind of method and device for being used to determine screen prjection automatic Proofreading |
| CN107124566A (en) * | 2017-05-27 | 2017-09-01 | 四川长虹电器股份有限公司 | TV with concealed LOGO |
| CN107561841A (en) * | 2017-09-29 | 2018-01-09 | 无锡昊瑜节能环保设备有限公司 | The automatic focusing method of the projecting apparatus adaptively adjusted |
| US11204543B2 (en) | 2017-11-30 | 2021-12-21 | Coretronic Corporation | Projection apparatus and auto-focusing method |
| CN107911690A (en) * | 2017-12-21 | 2018-04-13 | 陕西天和照明设备工程有限公司 | A kind of bore hole 3D projecting methods and system based on pseudo-classic architecture alien invasion |
| CN108513156A (en) * | 2018-03-27 | 2018-09-07 | 深圳市火乐科技发展有限公司 | A kind of control method and device based on Intelligent Laser TV |
| CN108710251A (en) * | 2018-04-20 | 2018-10-26 | 广景视睿科技（深圳）有限公司 | A kind of Atomatic focusing method, device and projecting apparatus |
| CN109188843A (en) * | 2018-10-24 | 2019-01-11 | 泉州市新锐极光科技有限公司 | It is a kind of can auto-focusing ultrashort out-of-focus projection's device and method thereof |
| CN110769234A (en) * | 2019-09-29 | 2020-02-07 | 深圳市火乐科技发展有限公司 | Projector focusing method based on ultrasonic waves, projector and related product |
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