CN105842972A - Method for adjusting projection focal length of projector and projector - Google Patents
Method for adjusting projection focal length of projector and projector Download PDFInfo
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- CN105842972A CN105842972A CN201610278669.6A CN201610278669A CN105842972A CN 105842972 A CN105842972 A CN 105842972A CN 201610278669 A CN201610278669 A CN 201610278669A CN 105842972 A CN105842972 A CN 105842972A
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- projection
- projector
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- current
- projection focal
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
The invention discloses a method for adjusting the projection focal length of a projector and the projector. The method includes establishing a correspondence relation between the projection distance between the projector and a projection screen and the optimal projection focal length of the projector in advance; detecting the current projection distance between the projector and the current projection screen when the projector is used for projecting; obtaining the optical projection focal length corresponding to the current projection distance according to the correspondence relation; adjusting the projection focal length of the projector to the optimal projection focal length corresponding to the current projection distance. By adopting the above method, automatic focal length adjustment of the projector can be realized and one-step focal length adjustment of the projector can be implemented more conveniently and quickly.
Description
Technical field
The present invention relates to projection art, particularly relate to method and the projection of a kind of projection focal length adjusting projector
Instrument.
Background technology
Projector, be a kind of can be by the equipment on image or VIDEO PROJECTION to projection screen, it projects to projection screen
On image or video keeping presenting several times in the case of definition or decades of times is amplified, be convenient for people to viewing,
Also giving the visual field that people are open, therefore, projector is welcome by user deeply.
When mobile projector instrument or projection screen, when the distance between projector and projection screen changes, projection is extremely
Easily there is fuzzy sense in the projected picture of projection screen, needs again to focus projector.In prior art, to projector
The method carrying out focusing is mainly image focusing method, is: projector projection as time, then shoot this projection by photographic head
Image, and detect the degree of understanding of this projector, when degree of understanding meet require time, finely tune Jiao of projector towards a direction
Away from, shooting projection picture again, and detect the degree of understanding of projection picture, when the degree of understanding of projection picture improves, then continue
Towards former directional trim focal length, if clearly spending dimmed, finely tuning projector the most in the opposite direction, so repeating, until projection picture is clear
Chu Du meets requirement, then projector has been focused.Image focusing method needs to adjust the most back and forth the focal length of projector, speed of focusing
Slower.
Summary of the invention
The technical problem that present invention mainly solves is to provide method and the projector of a kind of projection focal length adjusting projector,
It is capable of projector automatic focusing, and projector is capable of step Jiao and puts in place, more convenient, faster.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of throwing adjusting projector
The method of shadow focal length, including: pre-build the optimal throwing of the described projector projector distance to projection screen and described projector
Corresponding relation between shadow focal length；When described projector, detect working as between described projector and Current projection screen
Front projection distance；According to described corresponding relation, obtain described Current projection apart from corresponding best projection focal length；By described throwing
The projection focal length of shadow instrument is adjusted to described Current projection apart from corresponding best projection focal length.
Wherein, described by the Focussing of described projector to described Current projection apart from corresponding best projection focal length
Step include: obtain described projector Current projection focal length；Calculate described Current projection focal length and Current projection distance institute is right
Difference between the best projection focal length answered；According to described difference, calculate the treating of focusing ring of the projection lens of described projector
Rotate the number of turns；Judge that described Current projection focal length is greater than also being less than described Current projection burnt apart from corresponding best projection
Away from；If being more than, the focusing ring of the projection lens controlling described projector is rotated in a first direction the number of turns to be rotated；If being less than, control
The focusing ring of the projection lens making described projector is rotated in a second direction, the number of turns to be rotated.
Wherein, described first direction is counterclockwise, and described second direction is clockwise.
Wherein, described method also includes: during the projection focal length adjusting described projector, make described projector
Display lamp lights the first color；When the projection focal length described projector being detected is adjusted to described Current projection apart from corresponding
During best projection focal length, the display lamp of described projector is made to light the second color.
Wherein, the step of the Current projection distance between the described projector of described detection and Current projection screen includes: logical
Cross laser ranging system or supersonic range finder, detect Current projection between described projector and Current projection screen away from
From.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide a kind of projector, including:
Projection lens, focusing ring, processor, range unit, tumbler and memorizer, described focusing ring is arranged at described projection lens
On, for adjusting the projection focal length of described projection lens, described range unit is arranged on described projection lens, described processor
Being connected with projection lens, range unit, tumbler and memorizer respectively, described memorizer storage has projection lens to projection screen
Corresponding relation between projector distance and the best projection focal length of described projection lens of curtain；Described processor is used for: when described
When projector needs projection, by described range unit detect Current projection between described projector and Current projection screen away from
From；According to described corresponding relation, obtain described Current projection apart from corresponding best projection focal length；Control described tumbler
Drive described focusing ring to rotate, until the projection focal length of described projection lens be adjusted to described Current projection apart from corresponding
Till good projection focal length.
Wherein, described processor controls described tumbler and drives described focusing ring to rotate, until described projection lens
Projection focal length is adjusted to described Current projection step till corresponding best projection focal length and specifically includes: obtain described
Projector Current projection focal length, calculates described Current projection focal length and Current projection between corresponding best projection focal length
Difference, according to described difference, calculate the number of turns to be rotated of the focusing ring of the projection lens of described projector, it is judged that described currently
Projection focal length is greater than also being less than described Current projection apart from corresponding best projection focal length, if being more than, controls described turning
Dynamic device drives described focusing ring to be rotated in a first direction the number of turns to be rotated, if being less than, controlling described tumbler and driving described
Focusing ring is rotated in a second direction, the number of turns to be rotated.
Wherein, described first direction is counterclockwise, and described second direction is clockwise.
Wherein, described projector also includes light color driving means and display lamp, described light color driving means respectively with instruction
Lamp and processor connect；Described processor is additionally operable to: during the projection focal length adjusting described projector, control described lamp
Color driving means drives display lamp to light the first color；When the projection focal length described projector being detected is adjusted to described current throwing
Shadow, when corresponding best projection focal length, controls described light color driving means and drives display lamp to light the second color.
Wherein, described range unit is laser range finder or ultrasonic range finder.
The invention has the beneficial effects as follows: be different from the situation of prior art, the present invention pre-builds that projector is to projection screen
Corresponding relation between projector distance and the best projection focal length of projector of curtain, when projector, by the throwing of projector
Shadow Focussing is to Current projection best projection focal length corresponding to distance between projector with Current projection screen, thus realizes
Projector automatic focusing, and projector is capable of step Jiao and puts in place, more convenient, faster.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention adjusts method first embodiment of the projection focal length of projector；
Fig. 2 is the flow chart that the present invention adjusts in method first embodiment of the projection focal length of projector；
Fig. 3 is that the present invention adjusts the projection focal length of projector in method first embodiment of the projection focal length of projector
It is adjusted to the Current projection flow chart apart from corresponding best projection focal length；
Fig. 4 is the schematic diagram of projector embodiment of the present invention.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1, the method for the projection focal length automatically adjusting projector includes:
Step S201: pre-build that projector is between the projector distance and the best projection focal length of projector of projection screen
Corresponding relation；
Best projection focal length refers to want when the degree of understanding of the projected picture on projector to projection screen reaches predetermined
Focal length residing for the projection lens of projector when asking.Distance between projector and projection screen differs, best projection focal length
Differ, and best projection focal length corresponding to projector distance can detect in advance, and store.
Step S202: when projector, the Current projection distance between detection projector and Current projection screen；
Current projection distance between projector and Current projection screen can be obtained by laser or ultrasound examination
, then step S202 can detect projector throw with current specifically by laser ranging system or supersonic range finder again
Current projection distance between shadow screen.Certainly, in other alternate embodiments, when detecting Current projection distance, it is also possible to
Identify whether the shelter before projection lens is projection screen, if it is not, such as: shelter is the people before standing in projection lens,
Do not process, when Direct Recognition to shelter is projection screen, the just current throwing between detection projector and Current projection screen
Shadow distance, it is to avoid error detection.
Step S203: according to corresponding relation, obtains Current projection apart from corresponding best projection focal length；
Step S204: the projection focal length of projector is adjusted to Current projection apart from corresponding best projection focal length；
Distance between projector and projection screen is Current projection distance, and the projection focal length of projector is current
During best projection focal length corresponding to projector distance, the degree of understanding of the projected picture on projector to projection screen reaches pre-
Provisioning request, thus realize the automatic focusing of projector.
When projector is focused, mainly the projection lens of projector is focused.Projection lens for convenience
Focusing, projection lens is usually provided with focusing ring, focuses by rotating focusing ring.Certainly, when projection lens and tune
After Jiao Quan sets, can have corresponding relation by the length of the rotation number of turns that rotation focuses with adjusting focal length, please join
Readding Fig. 2, step S204 includes again:
Step S2041: obtain projector Current projection focal length, and calculate Current projection focal length and Current projection apart from institute
The corresponding difference between best projection focal length；
Difference is the length of the required focal length adjusted of projection lens.
Step S2042: according to difference, calculate the number of turns to be rotated of the focusing ring of the projection lens of projector；
Step S2043: judge Current projection focal length to be greater than also and be less than Current projection apart from corresponding best projection
Focal length, if being more than, then enters step S2044, no is less than, then enter step S2045；
Step S2044: the focusing ring of the projection lens controlling projector is rotated in a first direction the number of turns to be rotated；
Step S2045: the focusing ring of the projection lens controlling projector is rotated in a second direction, the number of turns to be rotated；
Current projection focal length, apart from corresponding best projection focal length then needs Current projection focal length more than Current projection
Shorten, make focusing ring be rotated in a first direction, Current projection focal length less than Current projection apart from corresponding best projection focal length,
Then needing to amplify Current projection focal length, make focusing ring be rotated in a second direction, wherein, first direction and second direction are contrary
Both direction, in the present embodiment, first direction is counterclockwise, and described second direction be clockwise direction.
Further, identify the state that projector is presently in for convenience, can display lamp be set on projector, passes through
The state of the color indicating projector of display lamp, then refer to Fig. 3, and method also includes:
Step S205: during the projection focal length adjusting projector, make the display lamp of projector light the first color；
First color is during indicating projector is currently in focusing.
Step S206: when projection focal length projector being detected is adjusted to Current projection apart from corresponding best projection Jiao
Away from time, make the display lamp of projector light the second color；
Second color has currently been focused for indicating projector, and projector can open projection work.
In embodiments of the present invention, the optimal throwing of the projector projector distance to projection screen and projector is pre-build
Corresponding relation between shadow focal length, when projector, adjusts the projection focal length of projector to projector and Current projection
The best projection focal length of the Current projection distance correspondence between screen, thus realize projector automatic focusing, and projector energy
Enough realize step Jiao to put in place, more convenient, faster.
The present invention provides again projector embodiment.Refer to Fig. 4, projector 30 include projection lens 31, focusing ring 32,
Processor 33, range unit 34, tumbler 35 and memorizer 36, focusing ring 32 is arranged on projection lens 31, is used for adjusting
The projection focal length of projection lens 31, range unit 34 is arranged on projection lens 31, processor 33 respectively with projection lens 31, survey
Connect away from device 34, tumbler 35 and memorizer 36, memorizer 36 storage have the projection of projection lens 31 to projection screen away from
Corresponding relation between the best projection focal length of projection lens 31.
Processor 33 is used for: when projector needs projection, detect projector and Current projection screen by range unit 34
Current projection distance between Mu, according to corresponding relation, obtains Current projection and turns apart from corresponding best projection focal length, control
Dynamic device 35 drives focusing ring 32 rotation, until the projection focal length of projection lens 31 be adjusted to Current projection apart from corresponding
Till good projection focal length.
Pre-build that projector is to the corresponding pass between the projector distance and the best projection focal length of projector of projection screen
System, when reality projects, directly adjusts the projection focal length of projector to the current throwing between projector and Current projection screen
Shadow is on corresponding best projection focal length, it is achieved projector settles focusing at one go, more convenient, faster.
Further, range unit 34 is when the Current projection distance detected between projector and Current projection screen, permissible
Being to be detected by laser or ultrasound wave, therefore, range unit 34 can be laser range finder or ultrasonic range finder.
The number of turns of focusing ring 32 rotation has corresponding relation with the variation length of projection focal length, therefore, it can first calculate tune
Jiao encloses the number of turns to be rotated of 32, then control focusing ring 32 rotates the number of turns to be rotated, then processor 33 controls tumbler 35
Drive focusing ring 32 rotation, until the projection focal length of projection lens 31 is adjusted to Current projection apart from corresponding best projection Jiao
Step till away from specifically includes: obtain projector Current projection focal length, calculates Current projection focal length and Current projection apart from institute
The corresponding difference between best projection focal length, according to difference, calculate the projection lens 31 of projector focusing ring 32 wait turn
Moving-coil number, it is judged that Current projection focal length is greater than also being less than Current projection apart from corresponding best projection focal length, if being more than,
Controlling tumbler 35 drives focusing ring 32 to be rotated in a first direction the number of turns to be rotated, if being less than, controlling tumbler 35 and driving
Focusing ring 32 is rotated in a second direction, the number of turns to be rotated.First direction is relative both direction with second direction, in this enforcement
In mode, first direction is counterclockwise, and second direction is clockwise.
Further, projector 30 also includes light color driving means 37 and display lamp 38, light color driving means 37 respectively with
Display lamp 38 and processor 33 connect.
Processor 33 is additionally operable to: during the projection focal length adjusting institute's projector, controls light color driving means 37 and drives
Dynamic display lamp 38 lights the first color, when projection focal length projector being detected is adjusted to Current projection apart from corresponding optimal
During projection focal length, control light color driving means 37 and drive bright 38 the second colors of display lamp.By the first color of display lamp 38
With two different conditions of the second color mark projector, in the present embodiment, the first color is preferably redness, the second color
It is preferably green.
In embodiments of the present invention, memorizer 36 is previously stored with projector to the projector distance of projection screen and projection
Corresponding relation between the best projection focal length of instrument, when projector, the projection focal length of projector is adjusted by processor 33
To the best projection focal length that the Current projection distance between projector with Current projection screen is corresponding, thus it is automatic to realize projector
Focus, and projector is capable of step Jiao and puts in place, more convenient, faster.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization is originally
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or are directly or indirectly used in what other were correlated with
Technical field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the method for the projection focal length adjusting projector, it is characterised in that including:
Pre-build right between the projector distance and the best projection focal length of described projector of projection screen of described projector
Should be related to；
When described projector, detect the Current projection distance between described projector and Current projection screen；
According to described corresponding relation, obtain described Current projection apart from corresponding best projection focal length；
The projection focal length of described projector is adjusted to described Current projection apart from corresponding best projection focal length.
Method the most according to claim 1, it is characterised in that
Described by the Focussing of described projector to described Current projection apart from the step bag of corresponding best projection focal length
Include:
Obtain described projector Current projection focal length；
Calculate described Current projection focal length and the Current projection difference between corresponding best projection focal length；
According to described difference, calculate the number of turns to be rotated of the focusing ring of the projection lens of described projector；
Judge that described Current projection focal length is greater than also being less than described Current projection apart from corresponding best projection focal length；
If being more than, the focusing ring of the projection lens controlling described projector is rotated in a first direction the number of turns to be rotated；
If being less than, the focusing ring of the projection lens controlling described projector is rotated in a second direction, the number of turns to be rotated.
Method the most according to claim 2, it is characterised in that
Described first direction is counterclockwise, and described second direction is clockwise.
Method the most according to claim 1, it is characterised in that described method also includes:
During the projection focal length adjusting described projector, the display lamp of described projector is made to light the first color；
When the projection focal length described projector being detected is adjusted to described Current projection apart from corresponding best projection focal length,
The display lamp making described projector lights the second color.
Method the most according to claim 1, it is characterised in that between the described projector of described detection and Current projection screen
The step of Current projection distance include:
By laser ranging system or supersonic range finder, that detects between described projector and Current projection screen is current
Projector distance.
6. a projector, it is characterised in that including: projection lens, focusing ring, processor, range unit, tumbler and deposit
Reservoir, described focusing ring is arranged on described projection lens, and for adjusting the projection focal length of described projection lens, described range finding fills
Installing and be placed on described projection lens, described processor is respectively with projection lens, range unit, tumbler and memorizer even
Connect, described memorizer storage have projection lens to projector distance and the described projection lens of projection screen best projection focal length it
Between corresponding relation；
Described processor is used for:
When described projector needs projection, detected between described projector and Current projection screen by described range unit
Current projection distance；
According to described corresponding relation, obtain described Current projection apart from corresponding best projection focal length；
Controlling described tumbler drives described focusing ring to rotate, and works as until the projection focal length of described projection lens is adjusted to described
Front projection is till corresponding best projection focal length.
Projector the most according to claim 6, it is characterised in that
Described processor controls described tumbler and drives described focusing ring to rotate, until the projection focal length of described projection lens is adjusted
The whole step for described Current projection till corresponding best projection focal length specifically includes:
Obtain described projector Current projection focal length, calculate described Current projection focal length and Current projection apart from corresponding optimal
Difference between projection focal length, according to described difference, calculates the number of turns to be rotated of the focusing ring of the projection lens of described projector,
Judge that described Current projection focal length is greater than also being less than described Current projection apart from corresponding best projection focal length, if greatly
In, controlling described tumbler and drive described focusing ring to be rotated in a first direction the number of turns to be rotated, if being less than, controlling described rotation
Device drives described focusing ring to be rotated in a second direction, the number of turns to be rotated.
Projector the most according to claim 7, it is characterised in that
Described first direction is counterclockwise, and described second direction is clockwise.
Projector the most according to claim 6, it is characterised in that described projector also includes light color driving means and instruction
Lamp, described light color driving means is connected with display lamp and processor respectively；
Described processor is additionally operable to:
During the projection focal length adjusting described projector, control described light color driving means and drive display lamp to light first
Color；
When the projection focal length described projector being detected is adjusted to described Current projection apart from corresponding best projection focal length,
Controlling described light color driving means drives display lamp to light the second color.
Projector the most according to claim 6, it is characterised in that
Described range unit is laser range finder or ultrasonic range finder.
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| CN201610278669.6A CN105842972A (en) | 2016-04-28 | 2016-04-28 | Method for adjusting projection focal length of projector and projector |
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| CN201610278669.6A CN105842972A (en) | 2016-04-28 | 2016-04-28 | Method for adjusting projection focal length of projector and projector |
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| CN107908061A (en) * | 2017-11-20 | 2018-04-13 | 北京数码视讯软件技术发展有限公司 | Set-top box and its projecting method |
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| CN109856902A (en) * | 2017-11-30 | 2019-06-07 | 中强光电股份有限公司 | Projection arrangement and Atomatic focusing method |
| CN110493582A (en) * | 2019-09-05 | 2019-11-22 | 无锡视美乐激光显示科技有限公司 | A kind of projecting method with automatic Focussing, device |
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| 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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| WO2021128599A1 (en) * | 2019-12-26 | 2021-07-01 | 成都极米科技股份有限公司 | Projector focusing method, projector focusing apparatus, and projector |
| WO2021128601A1 (en) * | 2019-12-26 | 2021-07-01 | 成都极米科技股份有限公司 | Projection focusing method and device, projector, and readable storage medium |
| US11849263B2 (en) | 2019-12-26 | 2023-12-19 | Chengdu Xgimi Technology Co., Ltd. | Projection focusing method, projection focusing apparatus, projector, and readable storage medium |
| CN113079360A (en) * | 2020-05-22 | 2021-07-06 | 上海六联智能科技有限公司 | Method for automatically adjusting projection focal length of projector |
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