CN105573041A - Method and device for realizing automatic focusing of projector, and projector - Google Patents
Method and device for realizing automatic focusing of projector, and projector Download PDFInfo
- Publication number
- CN105573041A CN105573041A CN201410529607.9A CN201410529607A CN105573041A CN 105573041 A CN105573041 A CN 105573041A CN 201410529607 A CN201410529607 A CN 201410529607A CN 105573041 A CN105573041 A CN 105573041A
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- Prior art keywords
- projector
- distance
- screen
- camera lens
- described projector
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
The invention discloses a method and a device for realizing automatic focusing of a projector, and a projector. The method is characterized in that a distance between the lens of the projector and a screen can be measured, and the distance between the lens of the projector and the screen can be adjusted according to the measured distance, and then the projector can be used for the clear projection on the screen. The automatic focusing of the projector can be realized by the actual measurement of the distance between the lens of the projector and the screen, and then the clear projection of the projector on the screen can be realized, and therefore the time-consuming problem of realizing the focusing by adjusting the projector manually can be effectively solved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method of projector auto-focusing, device and projector.
Background technology
Projector be a kind of can by image or VIDEO PROJECTION to a kind of equipment on curtain, it is widely used in the places such as teaching, meeting, report and family.Along with the development of modern electronic product, the volume of projector is more and more less and be more convenient for carrying, and further facilitates projector applications and popularization.
At present, in order to make projector projects to the clear picture on screen, user needs manually to adjust burnt ring and focuses, but the time that manual focus expends usually is longer.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide a kind of method of projector auto-focusing, device and projector, to expend time in long problem in order to solve in prior art manually adjustment projector focusing.
For solving the problem, the present invention is mainly achieved through the following technical solutions:
One aspect of the present invention provides a kind of method of projector auto-focusing, and the method comprises:
Distance between the camera lens of measuring projector to screen;
Adjust the distance between the camera lens of described projector and described screen according to the described distance measured, enable the clear projection on the screen of described projector.
Preferably, the distance between the described distance adjustment camera lens of described projector that described basis measures and described screen, enables the step of described projector clear projection on the screen specifically comprise:
Judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, adjust the position of described projector, make the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, the further camera lens measuring the described projector after adjustment is to the distance between described screen, and adjust the distance between the camera lens of described projector and described screen according to this distance, enable the clear projection on the screen of described projector.
Preferably, the distance between the camera lens of the described projector of described adjustment and described screen is s,
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is that the camera lens of described projector is to the distance between described screen.
Preferably, the camera lens of described measuring projector specifically comprises to the step of the distance between screen:
Distance between the camera lens being measured described projector by the distance measuring equipment on described projector to described screen.
The present invention additionally provides a kind of device of projector auto-focusing on the other hand, and this device comprises:
Measuring unit, for the camera lens of measuring projector to the distance between screen;
Processing unit, for adjusting the distance between the camera lens of described projector and described screen according to the described distance measured, enables the clear projection on the screen of described projector.
Preferably, described processing unit comprises further: judge module, coarse adjustment module and accurate adjustment module;
Described judge module, for judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, trigger described coarse adjustment module, otherwise trigger described accurate adjustment module;
Described coarse adjustment module, for adjusting the position of described projector, making the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, and triggering described measuring unit;
Described accurate adjustment module, the described distance for measuring according to described measuring unit adjusts the distance between the camera lens of described projector and described screen, enables the clear projection on the screen of described projector.
Preferably, described accurate adjustment module specifically for, distance between the described camera lens apart from the described projector of adjustment measured according to described measuring unit and described screen, enable the clear projection on the screen of described projector, distance between the camera lens of the described projector of described adjustment and described screen is s
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is that the camera lens of described projector is to the distance between described screen.
Preferably, described measuring unit is specifically for, the distance between the camera lens being measured described projector by the distance measuring equipment on described projector to described screen.
Further aspect of the present invention further provides a kind of projector, and this projector comprises above-mentioned device described in any one.
Beneficial effect of the present invention is as follows:
The present invention can carry out the focusing of projector automatically according to the distance between the camera lens of the actual projector recorded to screen, make projector can clear projection on screen, thus effectively to solve in prior art manually adjustment projector focusing and to expend time in long problem.
Other features and advantages of the present invention will be set forth in the following description, and the becoming apparent from instructions of part, or by implementing the present invention and understanding.Object of the present invention and other advantages realize by structure specifically noted in write instructions, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for a kind of projector auto-focusing of the embodiment of the present invention;
Fig. 2 is the process flow diagram of the method for the another kind of projector auto-focusing of the embodiment of the present invention;
Fig. 3 is the structural representation of the device of a kind of projector auto-focusing of the embodiment of the present invention;
Fig. 4 is the structural representation of the device of the another kind of projector auto-focusing of the embodiment of the present invention.
Embodiment
Specifically describe the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing forms the application's part, and together with embodiments of the present invention for explaining principle of the present invention.For purpose of clarity and simplification, when it may make theme of the present invention smudgy, illustrating in detail of known function and structure in device described herein will be omitted.
The fundamental purpose of the embodiment of the present invention is to provide a kind of method of projector auto-focusing, device and projector, by means of only the camera lens of actual measurement projector to the distance between screen, just can realize the auto-focusing of projector, make projector can clear projection on screen, thus effectively to solve in prior art manually adjustment projector focusing and to expend time in long problem.Just by several specific embodiment, technical scheme of the present invention is described in detail below.
Embodiments provide a kind of method of projector auto-focusing, see Fig. 1, the method comprises:
Distance between the camera lens of S101, measuring projector to screen;
Due to the being easy to carry property of portable projector, so the present invention is particularly useful for the timely focusing of portable projector.
Be embodied as, by arranging ultrasonic unit (or other distance measuring equipments on projector, as arranged laser instrument and the processor receiving the laser that screen is reflected back on projector, and corresponding laser reflection device is set on screen), by the distance between the camera lens of this ultrasonic unit measuring projector to screen, described ultrasonic unit is arranged on the camera lens of described projector on same vertical plane, and namely described ultrasonic unit is equal to the distance of described screen with described camera lens to the distance of described screen.
Distance between the camera lens of the described projector of described distance adjustment that S102, basis measure and described screen, enables the clear projection on the screen of described projector.
This step specifically comprises: judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, adjust the position of described projector, make the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, the further camera lens measuring the described projector after adjustment is to the distance between described screen, and adjust the distance between the camera lens of described projector and described screen according to this distance, enable the clear projection on the screen of described projector.
Namely when the camera lens of projector is beyond the maximum image distance of projector and minimum image distance, adjust the position of described projector, make the described camera lens that measures to screen distance between the maximum image distance of projector and minimum image apart between, again further the camera lens of measuring projector to the distance between screen, and adjust the distance between the camera lens of described projector and described screen according to the described distance measured, the camera lens of described projector can clearly be projected on the screen.
When projector camera lens to screen distance between the maximum image distance of projector and minimum image apart between time, the present invention can realize the auto-focusing of projector by adjustment automatically, and the displacement s of the camera lens of described projector is:
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is image distance, and namely the camera lens of described projector is to the actual range between described screen.
The present invention is mechanically connected particular by by the camera lens of projector and electro-motor, realizes camera lens move forward and backward along optical axis direction by electro-motor.Because ultrasonic unit and camera lens are on same vertical plane always, so during actual enforcement, the position being promoted camera lens and ultrasonic unit by electro-motor is moved simultaneously.
Fig. 2 is the process flow diagram of the method for the another kind of projector auto-focusing of the embodiment of the present invention, will be described in detail below for portable projector composition graphs 2 to method of the present invention:
S201, unlatching portable projector, ensure beam projection out;
S202, by the distance L of ultrasonic measurement projector lens to screen
0;
S203, according to Gauss formula 1/f=1/u+1/v, i.e. v=f/ (1-f/u), wherein f is focal length, u is object distance, v is image distance, calculates when projector can project picture rich in detail, and camera lens from screen farthest or nearest distance, namely the maximum image distance v (max) of projector and minimum image are apart from v (min), by L
0compare with v (max) and v (min);
S204, work as L
0time <v (min), reminding user on application interface, moves v (min)-L backward
0;
S205, work as L
0time >v (max), reminding user on application interface, moves forward L
0-v (min);
S206, v (min) <L
0time <v (max), calculate lens moving distance for s according to 1/f=1/ (u-s)+1/ (v+s),
V=L in this formula
0, and S has positive and negative point, can representative shot movable;
S207, end.
The embodiment of the present invention additionally provides a kind of device of projector auto-focusing, and see Fig. 3, this device specifically comprises the measuring unit 31 and processing unit 32 that intercouple and connect, concrete,
Measuring unit 31, for the camera lens of measuring projector to the distance between screen, the distance between the concrete embodiment of the present invention camera lens of being measured described projector by the distance measuring equipment on described projector to described screen;
Processing unit 32, for adjusting the distance between the camera lens of described projector and described screen according to the described distance measured, enables the clear projection on the screen of described projector.
Fig. 4 is the structural representation of the device of the another kind of projector auto-focusing of the embodiment of the present invention, compared with Fig. 3, as shown in Figure 4, the processing unit 32 of the device of the embodiment of the present invention comprises further: judge module 321, coarse adjustment module 322 and accurate adjustment module 323;
Described judge module 321, for judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, trigger described coarse adjustment module, otherwise trigger described accurate adjustment module;
Described coarse adjustment module 322, for adjusting the position of described projector, making the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, and triggering described measuring unit;
Described accurate adjustment module 323, the described distance for measuring according to described measuring unit adjusts the distance between the camera lens of described projector and described screen, enables the clear projection on the screen of described projector.
The described accurate adjustment module 323 of the embodiment of the present invention specifically for, distance between the described camera lens apart from the described projector of adjustment measured according to described measuring unit and described screen, enable the clear projection on the screen of described projector, distance between the camera lens of the described projector of described adjustment and described screen is s
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is that the camera lens of described projector is to the distance between described screen.
The embodiment of the present invention additionally provides a kind of projector, and this projector comprises above-mentioned device described in any one.The related content of projector of the present invention, see the related content of the method and apparatus described in instructions of the present invention, does not repeat them here.
The present invention at least can bring following beneficial effect:
The present invention can carry out the focusing of projector automatically according to the distance between the camera lens of the actual projector recorded to screen, make projector can clear projection on screen, thus effectively to solve in prior art manually adjustment projector focusing and to expend time in long problem.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (9)
1. a method for projector auto-focusing, is characterized in that, comprising:
Distance between the camera lens of measuring projector to screen;
Adjust the distance between the camera lens of described projector and described screen according to the described distance measured, enable the clear projection on the screen of described projector.
2. method according to claim 1, is characterized in that, the distance between the described distance adjustment camera lens of described projector that described basis measures and described screen, and the step of described projector clear projection on the screen is specifically comprised:
Judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, adjust the position of described projector, make the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, the further camera lens measuring the described projector after adjustment is to the distance between described screen, and adjust the distance between the camera lens of described projector and described screen according to this distance, enable the clear projection on the screen of described projector.
3. method according to claim 2, is characterized in that, the distance between the camera lens of the described projector of described adjustment and described screen is s,
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is that the camera lens of described projector is to the distance between described screen.
4. according to the method in claim 1-3 described in any one, it is characterized in that, the step of the distance between the camera lens of described measuring projector to screen specifically comprises:
Distance between the camera lens being measured described projector by the distance measuring equipment on described projector to described screen.
5. a device for projector auto-focusing, is characterized in that, comprising:
Measuring unit, for the camera lens of measuring projector to the distance between screen;
Processing unit, for adjusting the distance between the camera lens of described projector and described screen according to the described distance measured, enables the clear projection on the screen of described projector.
6. device according to claim 5, is characterized in that, described processing unit comprises further: judge module, coarse adjustment module and accurate adjustment module;
Described judge module, for judge distance between the camera lens of described projector to described screen whether the maximum image distance of described projector and minimum image apart between, when described distance is not between the maximum image distance and minimum image distance of described projector, trigger described coarse adjustment module, otherwise trigger described accurate adjustment module;
Described coarse adjustment module, for adjusting the position of described projector, making the distance between the camera lens of described projector to described screen between the maximum image distance and minimum image distance of described projector, and triggering described measuring unit;
Described accurate adjustment module, the described distance for measuring according to described measuring unit adjusts the distance between the camera lens of described projector and described screen, enables the clear projection on the screen of described projector.
7. device according to claim 6, is characterized in that,
Described accurate adjustment module specifically for, distance between the described camera lens apart from the described projector of adjustment measured according to described measuring unit and described screen, enable the clear projection on the screen of described projector, the distance between the camera lens of the described projector of described adjustment and described screen is s
Wherein, f is the focal length of described projector, and u is the object distance of described projector, and v is that the camera lens of described projector is to the distance between described screen.
8., according to the device in claim 5-7 described in any one, it is characterized in that,
Described measuring unit is specifically for, the distance between the camera lens being measured described projector by the distance measuring equipment on described projector to described screen.
9. a projector, is characterized in that, this projector comprises the device in claim 5-8 described in any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410529607.9A CN105573041A (en) | 2014-10-09 | 2014-10-09 | Method and device for realizing automatic focusing of projector, and projector |
| PCT/CN2015/071255 WO2015131688A1 (en) | 2014-10-09 | 2015-01-21 | Method and apparatus for automatic projector focusing, and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410529607.9A CN105573041A (en) | 2014-10-09 | 2014-10-09 | Method and device for realizing automatic focusing of projector, and projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105573041A true CN105573041A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410529607.9A Pending CN105573041A (en) | 2014-10-09 | 2014-10-09 | Method and device for realizing automatic focusing of projector, and projector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105573041A (en) |
| WO (1) | WO2015131688A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106488206A (en) * | 2016-11-18 | 2017-03-08 | 四川长虹电器股份有限公司 | Projection display apparatus and its auto focusing method |
| 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 |
| 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 |
| CN109856902A (en) * | 2017-11-30 | 2019-06-07 | 中强光电股份有限公司 | Projection arrangement and Atomatic focusing method |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301884A (en) * | 2015-11-13 | 2016-02-03 | 神画科技（深圳）有限公司 | Method and system for automatic focusing on multi-point reference image recognition |
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| JP5310266B2 (en) * | 2009-05-29 | 2013-10-09 | セイコーエプソン株式会社 | Projector and control method thereof |
| TWI436154B (en) * | 2011-01-31 | 2014-05-01 | Asia Optical Co Inc | The projector's autofocus system |
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- 2014-10-09 CN CN201410529607.9A patent/CN105573041A/en active Pending
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- 2015-01-21 WO PCT/CN2015/071255 patent/WO2015131688A1/en active Application Filing
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| US20040130685A1 (en) * | 2003-01-02 | 2004-07-08 | Lite-On Technology Corporation | Automatic focusing method for projector and projector using this method |
| CN1763630A (en) * | 2004-10-22 | 2006-04-26 | 惠普开发有限公司 | Projector alignment method and user interface |
| CN101281289A (en) * | 2007-12-29 | 2008-10-08 | 青岛海信电器股份有限公司 | 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106488206A (en) * | 2016-11-18 | 2017-03-08 | 四川长虹电器股份有限公司 | Projection display apparatus and its auto focusing method |
| 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 |
| CN109856902A (en) * | 2017-11-30 | 2019-06-07 | 中强光电股份有限公司 | Projection arrangement and Atomatic focusing method |
| US11204543B2 (en) | 2017-11-30 | 2021-12-21 | Coretronic Corporation | Projection apparatus and auto-focusing method |
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015131688A1 (en) | 2015-09-11 |
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Application publication date: 20160511 |