CN103324020A - Automatic focusing control system for projector - Google Patents

Automatic focusing control system for projector Download PDF

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Publication number
CN103324020A
CN103324020A CN2013102428940A CN201310242894A CN103324020A CN 103324020 A CN103324020 A CN 103324020A CN 2013102428940 A CN2013102428940 A CN 2013102428940A CN 201310242894 A CN201310242894 A CN 201310242894A CN 103324020 A CN103324020 A CN 103324020A
Authority
CN
China
Prior art keywords
projection
projector
controller
automatic focusing
camera lens
Prior art date
Application number
CN2013102428940A
Other languages
Chinese (zh)
Inventor
晏正涛
杨聚庆
玉敏燕
Original Assignee
中山市众盈光学有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中山市众盈光学有限公司 filed Critical 中山市众盈光学有限公司
Priority to CN2013102428940A priority Critical patent/CN103324020A/en
Publication of CN103324020A publication Critical patent/CN103324020A/en

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Abstract

The invention discloses an automatic focusing control system for a projector. The automatic focusing control system for the projector comprises a projector head and a projection lens, wherein a filtering reflector is arranged between the projector head and the projection lens, the reflection output end of the filtering reflector is connected with an image collecting chip, the signal output end of the image collecting chip is connected with a controller, the controller is used for calculating the contrast ratio of a projection picture which is reflected back, the control signal input end of the projector head is connected with the controller, and a driving motor which is used for adjusting the position of the projection lens is arranged between the controller and the projection lens. The automatic focusing control system for the projector is used for achieving closed-loop control over focusing of the projector, the picture projected on a screen is converted into a digital image signal again through the projection lens and the image collecting chip, the controller calculates the contrast ratio, then, the projection lens is adjusted to be at an appropriate position through the driving motor to improve the contrast ratio so as to enable an image projected on the screen to be clear, and the process of automatic focusing is accomplished.

Description

A kind of projector automatic focusing control system

[technical field]

The present invention relates to a kind of projector automatic focusing control system, belong to Digital Image Processing and the optical lens field of focusing automatically.

[background technology]

For a long time, the focusing of projector all is the form appearance with manual focusing, and after the distance that changes between projector and the screen, ambiguous phenomenon often appears in the picture that casts out.And to watch clearly picture to focus again, this brings certain inconvenience to people.

Therefore, be necessary to address the above problem.

[summary of the invention]

The present invention has overcome the deficiency of above-mentioned technology, and projector's automatic focusing control system a kind of simple in structure, easy to use is provided.

For achieving the above object, the present invention has adopted following technical proposal:

A kind of projector automatic focusing control system, include for the digital signal image with want projection and convert the projection head 2 of light image output to and be used for the light image enlarging projection of the projection head 2 outputs projection camera lens 3 to the screen, described projection head 2 and projection are provided with between the camera lens 3 be used to the optical filtering catoptron 4 of choosing the projected picture information of reflected back projection camera lens 3 from the screen, described optical filtering catoptron 4 reflection output terminals are connected with image collection chip 5, described image collection chip 5 signal output parts are connected with the controller 1 of the projected picture contrast that reflects for calculating, described projection head 2 control signal input ends are connected with controller 1, are provided with between described controller 1 and the projection camera lens 3 for adjusting projection camera lens 3 makes the screen prjection clear picture with the raising contrast to correct position drive motor 6.

Also be connected with the input button 7 that arranges for manually on the described controller 1.

Compared with prior art, the invention has the beneficial effects as follows:

1, realizes the closed-loop control of projector's focusing, the picture that projects on the screen converts data image signal to again through projection camera lens, optical filtering catoptron, image collection chip, controller calculates contrast, throw camera lens to correct position by the drive motor adjustment then, make the screen prjection clear picture to improve contrast, finish the automatic focusing process.

2, controller is provided with the input button, realizes the combination of manual focusing and automatic focusing, is convenient to actual use.

3, one-piece construction is simple, and control is simple, and is easy to use, easy to utilize.

[description of drawings]

Fig. 1 is structure principle chart of the present invention.

[embodiment]

Be described in further detail by the feature of the present invention of embodiment and other correlated characteristic below in conjunction with accompanying drawing, so that technician's of the same trade understanding:

As shown in Figure 1, a kind of projector automatic focusing control system, include for the digital signal image with want projection and convert the projection head 2 of light image output to and be used for the light image enlarging projection of the projection head 2 outputs projection camera lens 3 to the screen, described projection head 2 and projection are provided with between the camera lens 3 be used to the optical filtering catoptron 4 of choosing the projected picture information of reflected back projection camera lens 3 from the screen, described optical filtering catoptron 4 reflection output terminals are connected with image collection chip 5, described image collection chip 5 signal output parts are connected with the controller 1 of the projected picture contrast that reflects for calculating, described projection head 2 control signal input ends are connected with controller 1, are provided with between described controller 1 and the projection camera lens 3 for adjusting projection camera lens 3 makes the screen prjection clear picture with the raising contrast to correct position drive motor 6.

Also be connected with the input button 7 that arranges for manually on the aforesaid controller 1.

The course of work and the principle of work of this case are as follows:

Projection head 2 by projection camera lens 3 with image projection to screen, reflection ray is through 3 incidents of projection camera lens, after the reflection of optical filtering catoptron 4, enter image collection chip 5, obtain the current feedback digital image that is incident upon picture on the screen, this feedback digital image is sent into controller 1 degree of comparing calculate, adjust projection camera lens 3 positions by drive motor 6, after projected picture is clear, just finish the automatic focusing process, wherein, automatic focusing process and principle are as follows in detail:

After opening initialization is finished, the running of controller 1 control drive motor 6, projection camera lens 3 is walked one time at whole focusing stroke, controller 1 selects the most tangible zone of projected picture contrast as sample area, the calculating contrast is also noted, and after finishing the data that obtain is compared, and finds a highest position of contrast and gives drive motor 6 corresponding signals, make it run to the highest position of contrast, finish first automatic focusing process.In use gather the contrast of current picture in real time, when contrast starts the automatic focusing process again when great changes have taken place, remember that current contrast value is G0, at first give drive motor 6 signals to certain direction running, the calculating contrast is designated as G1 after gathering projected picture information at this moment, compares G0 and G1 size then; If G0〉G1, then illustrate and current drive motor 6 traffic directions focus with projector direction is opposite clearly, so give drive motor 6 signals toward the reverse direction operation, find a contrast for the highest position in that this side up, the automatic focusing process was finished after control drive motor 6 ran to this position; If G0<G1, illustrate that then current direction is projector's direction clearly of focusing, continue control drive motor 6 in this side up operation, find a contrast to be the highest position, drive motor 6 is run to this position after the automatic focusing process finish.

As mentioned above, what this case was protected is a kind of New Projection Display automatic focusing control device, and all technical schemes identical or close with this case structure all should be shown in the protection domain that falls into this case.

Claims (2)

1. projector's automatic focusing control system, it is characterized in that including for the digital signal image with want projection and convert the projection head (2) of light image output to and be used for the light image enlarging projection of projection head (2) the output projection camera lens (3) to the screen, be provided with between described projection head (2) and projection camera lens (3) be used to the optical filtering catoptron (4) of choosing the projected picture information of reflected back projection camera lens (3) from the screen, described optical filtering catoptron (4) reflection output terminal is connected with image collection chip (5), described image collection chip (5) signal output part is connected with the controller (1) of the projected picture contrast that reflects for calculating, described projection head (2) control signal input end is connected with controller (1), is provided with between described controller (1) and the projection camera lens (3) for adjusting projection camera lens (3) makes the screen prjection clear picture with the raising contrast to correct position drive motor (6).
2. a kind of projector according to claim 1 automatic focusing control system is characterized in that also being connected with on the described controller (1) the input button (7) that arranges for manually.
CN2013102428940A 2013-06-18 2013-06-18 Automatic focusing control system for projector CN103324020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013102428940A CN103324020A (en) 2013-06-18 2013-06-18 Automatic focusing control system for projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013102428940A CN103324020A (en) 2013-06-18 2013-06-18 Automatic focusing control system for projector

Publications (1)

Publication Number Publication Date
CN103324020A true CN103324020A (en) 2013-09-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103489338A (en) * 2013-09-29 2014-01-01 国家电网公司 Three-dimensional scene projection player
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11119183A (en) * 1997-10-20 1999-04-30 Fujitsu General Ltd Automatic focusing device for liquid crystal projector
JP2005037774A (en) * 2003-07-17 2005-02-10 Sanyo Electric Co Ltd Projection type video display device
CN1655000A (en) * 2004-02-13 2005-08-17 中国科学院力学研究所 Angular automatic focusing system and method for optical imaging system
CN1713068A (en) * 2004-06-23 2005-12-28 精工爱普生株式会社 Automatic focus adjustment for projector
CN101178535A (en) * 2006-11-10 2008-05-14 鸿富锦精密工业(深圳)有限公司 Automatic focus porjector and automatic focus method thereof
CN201926858U (en) * 2010-12-31 2011-08-10 深圳展景世纪科技有限公司 Projector
CN102375316A (en) * 2010-08-27 2012-03-14 鸿富锦精密工业(深圳)有限公司 Projector and automatic focusing method thereof
CN203397073U (en) * 2013-06-18 2014-01-15 中山市众盈光学有限公司 Projector automatic focusing control device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11119183A (en) * 1997-10-20 1999-04-30 Fujitsu General Ltd Automatic focusing device for liquid crystal projector
JP2005037774A (en) * 2003-07-17 2005-02-10 Sanyo Electric Co Ltd Projection type video display device
CN1655000A (en) * 2004-02-13 2005-08-17 中国科学院力学研究所 Angular automatic focusing system and method for optical imaging system
CN1713068A (en) * 2004-06-23 2005-12-28 精工爱普生株式会社 Automatic focus adjustment for projector
CN101178535A (en) * 2006-11-10 2008-05-14 鸿富锦精密工业(深圳)有限公司 Automatic focus porjector and automatic focus method thereof
CN102375316A (en) * 2010-08-27 2012-03-14 鸿富锦精密工业(深圳)有限公司 Projector and automatic focusing method thereof
CN201926858U (en) * 2010-12-31 2011-08-10 深圳展景世纪科技有限公司 Projector
CN203397073U (en) * 2013-06-18 2014-01-15 中山市众盈光学有限公司 Projector automatic focusing control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103489338A (en) * 2013-09-29 2014-01-01 国家电网公司 Three-dimensional scene projection player
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

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C10 Entry into substantive examination
CB03 Change of inventor or designer information

Inventor after: Liu Jiaoyue

Inventor after: Yan Zhengtao

Inventor after: Yang Juqing

Inventor after: Tian Lei

Inventor after: Wang Minyan

Inventor before: Yan Zhengtao

Inventor before: Yang Juqing

Inventor before: Yu Minyan

C53 Correction of patent for invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: YAN ZHENGTAO YANG JUQING YU MINYAN TO: LIU JIAOYUE YAN ZHENGTAO YANG JUQING TIAN LEI WANG MINYAN

RJ01 Rejection of invention patent application after publication

Application publication date: 20130925

C12 Rejection of a patent application after its publication