CN109426060A - Projector automatic focusing method and projector - Google Patents
Projector automatic focusing method and projector Download PDFInfo
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- CN109426060A CN109426060A CN201710716797.9A CN201710716797A CN109426060A CN 109426060 A CN109426060 A CN 109426060A CN 201710716797 A CN201710716797 A CN 201710716797A CN 109426060 A CN109426060 A CN 109426060A
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
The present invention provides a kind of projector automatic focusing methods, the projector includes the camera lens that can be moved forward and backward along optical axis, the drive motor for driving the camera lens mobile, the projector automatic focusing method include the following steps: to obtain the best projection position of corresponding camera lens when clearest projected image；The camera lens is driven to be moved to the best projection position from current location by drive motor.The present invention also provides a kind of projectors.Compared with the relevant technologies, projector automatic focusing method of the invention and projector can fast implement the automatic focusing of projection, and user experience is good and this method is simple.
Description
Technical field
The invention belongs to projection arts, and in particular to a kind of projector automatic focusing method and projector.
Background technique
Currently, shadow casting technique obtains universal application in people's daily life.No matter in meeting, teaching or public place of entertainment
All it is seen everywhere the use of optical projection system.
In the related technology, family, education middle-size and small-size projector, when needing to re-focuse, the projector is first looked into
It looks for and determines the clearest focusing parameter of camera lens when can get clearest projected image, camera lens adjustment is then returned to zero
Point, then the camera lens is moved up to stopping position corresponding to the clearest focusing parameter since the zero point, it completes certainly
Dynamic focusing.
However, in the focus adjustment method, after the projector obtains the clearest focusing parameter of the camera lens, regardless of described
Where is the present position of camera lens, the camera lens need be all moved to zero point, then move since the zero point, until described
Camera lens stops to position corresponding to the clearest focusing parameter.On the one hand make the focus adjustment method complicated, on the other hand should
Focus adjustment method is moved in zero point step in camera lens expends the time, so that the focusing speed of projector is slow, sensitivity is low.
Therefore, it is really necessary to provide one kind new projector automatic focusing method and projector to solve the above problems.
Summary of the invention
For the above the deficiencies in the prior art, the present invention proposes a kind of projector automatic focusing method and projector, can be fast
Speed realizes the automatic focusing of projection, and user experience is good and this method is simple.
The present invention provides a kind of projector automatic focusing method, the projector includes the mirror that can be moved forward and backward along optical axis
Head, the drive motor for driving the camera lens mobile, the projector automatic focusing method include the following steps:
Obtain the best projection position of corresponding camera lens when clearest projected image；
The camera lens is driven to be moved to the best projection position from current location by drive motor.
Preferably, in the clearest projected image of the acquisition in the best projection position step of the corresponding camera lens,
The best projection position is obtained using image analytical method, is included the following steps:
The camera lens is adjusted to zero；
It focuses since the zero point, and detection is synchronized to the clarity of projected image, until obtaining clearest figure
Picture, the camera lens corresponding best projection position when record obtains the clearest projected image.
Preferably, the zero point is the focusing starting point or focusing terminal of the camera lens.
Preferably, the zero point is the mechanical zero or electronics zero point or optoelectronic induction zero point or electromagnetism of the lens focus
Incude zero point.
Preferably, in the clearest projected image of the acquisition in the best projection position step of the corresponding camera lens,
The best projection position is obtained using telemetry, is included the following steps:
It pre-establishes corresponding to clearest projected image of the projector distance of the camera lens to projection screen with the camera lens most
The corresponding relationship of good projected position；
Current projection distance when detection projection between the camera lens and Current projection screen；
Best projection position of the Current projection apart from the corresponding camera lens is obtained according to the corresponding relationship.
Preferably, the Current projection in the detection projection between the camera lens and Current projection screen apart from the step of
In, further include following steps:
Analysis obtains two adjacent projector distances in the corresponding relationship, and the Current projection distance is located at this two
Between the adjacent projector distance；
Compare in the two adjacent projector distances obtained in the corresponding relationship and is more leaned on the Current projection distance
Close one；
By in two adjacent projector distances with the Current projection distance closer to one be equal and be confirmed as institute
State Current projection distance.
Preferably, in described the step of driving the camera lens to be moved to the best projection position by drive motor,
Include the following steps:
Obtain the current location of the camera lens；
Calculate the camera lens the current location and the camera lens Current projection apart from corresponding best projection position it
Between lens location difference；
Camera lens moving distance to be moved is calculated according to the lens location difference；
Make the mobile moving distance of the camera lens by the drive motor, the camera lens is made to be located at the best projection
Position.
Preferably, the Current projection in the detection projection between the camera lens and Current projection screen apart from the step of
In, the Current projection distance is measured by distance measuring sensor.
Preferably, the distance measuring sensor is used to obtain the vertical range of the camera lens and projection screen, includes at least
Two, the first vertical range and the second vertical range of the camera lens and projection screen are obtained respectively, adjusts the projector
Position make first vertical range be equal to second vertical range when, first vertical range or described second vertically away from
From i.e. be determined as with a distance from the Current projection.
The present invention also provides a kind of projectors, comprising: camera lens, for going out to projection screen light emission to form perspective view
Picture；Drive motor, for driving the camera lens mobile；Distance measuring sensor, for measuring the camera lens to the projection screen
Vertical range；Memory, for storing the projector distance and the camera lens of the camera lens pre-established to the projection screen
Clearest projected image corresponding to best projection position corresponding relationship；And processor, for reading in the memory
The corresponding relationship and control the drive motor, the distance measuring sensor executes the step of above-mentioned projector automatic focusing method
Suddenly；The drive motor and distance measuring sensor and memory are connected to the processor respectively.
Compared with the relevant technologies, projector automatic focusing method of the invention and projector are by obtaining clearest perspective view
As when the corresponding camera lens best projection position, then to drive the camera lens to be directly moved to by drive motor described best
Projected position realizes automatic focusing, and this method directly acquires the best projection position of corresponding camera lens when clearest projected image
It sets, eliminates and be reconverted into the process of corresponding best projection position by obtaining best projection focusing parameter or focusing focal length,
So that this method is simpler, automatic focusing speed is fast；In addition, after this method obtains best projection position, it is directly that camera lens is mobile
It realizes and focuses to the best projection position, be moved to the best projection position again without returning to camera lens adjustment after zero point, realize
Faster automatic focusing function, so that the automatic focusing speed of the projector is fast, sensitivity is higher.
Detailed description of the invention
The invention will now be described in detail with reference to the accompanying drawings.By made detailed description in conjunction with the following drawings, of the invention is upper
It states or otherwise content will be apparent and be easier to understand.In attached drawing:
Fig. 1 is the flow chart of the automatic focusing method of projector automatic focusing method embodiment one of the present invention；
Fig. 2 is the sub-process figure of the step S11 of projector automatic focusing method embodiment one of the present invention；
Fig. 3 is the schematic diagram for obtaining the best projection location method in Fig. 2 using image analytical method；
Fig. 4 is the flow chart of the automatic focusing method of projector automatic focusing method embodiment two of the present invention；
Fig. 5 is the sub-process figure of the step S21 of the embodiment two of projector automatic focusing method of the present invention；
Fig. 6 is the structural schematic diagram of the method for a sub-process in Fig. 5；
Fig. 7 is the sub-process figure of the step S22 of the embodiment two of projector automatic focusing method of the present invention；
Fig. 8 is the structural block diagram of projector of the present invention.
Specific embodiment
The embodiment of the invention will now be described in detail with reference to the accompanying drawings.
Specific embodiment/the embodiment recorded herein is specific specific embodiment of the invention, for illustrating this
The design of invention, be it is explanatory and illustrative, should not be construed as the limitation to embodiment of the present invention and the scope of the invention.
In addition to the embodiment recorded herein, those skilled in the art can also be based on disclosed in the claim of this application book and specification
For content using obvious other technical solutions, these technical solutions include using taking the post as to the embodiment recorded herein
The technical solution of what obvious substitutions and modifications, all within protection scope of the present invention.
In projector automatic focusing method of the invention, following two embodiment is provided and is illustrated:
Embodiment one
Fig. 1 and Fig. 2 are please referred to, the present invention provides a kind of projector automatic focusing method, the projector includes can be along optical axis
The camera lens of back-and-forth motion, the drive motor for driving the camera lens mobile, the projector automatic focusing method include the following steps:
Step S11, the best projection position of corresponding camera lens when clearest projected image is obtained；
Specifically, obtaining the best projection position in this step S11 using image analytical method, including the following steps:
Step S111, the camera lens is adjusted to zero；
In present embodiment, the zero point is the focusing starting point or focusing terminal of the camera lens.Specifically, the zero point is described
The mechanical zero or electronics zero point or optoelectronic induction zero point or electromagnetic induction zero point of lens focus.
Step S112, it focuses since the zero point, and detection is synchronized to the clarity of projected image, until
Obtain clearest projected image, record obtains the corresponding best projection position of camera lens when the clearest image.
Incorporated by reference to shown in Fig. 3, in this step, using image analytical method specifically:
The camera lens, the mirror are moved by the drive motor in the focusing range (zero point O to terminal nn) of the camera lens
Head is often moved to a current location nx, that is, obtains a corresponding projected image, up within the scope of acquisition zero point o to terminal nn
Then n projected image of all positions is compared in the n projected image and is determined corresponding to clearest one
Lens location, i.e. the best projection position nbest of camera lens.
Step S12, the camera lens is driven to be moved to the best projection position from current location by drive motor.
Behind the best projection position for obtaining the camera lens, no matter the current location nx of the camera lens is where, will be described
Camera lens is directly moved to the best projection position nbest of the camera lens from current location nx, completes focusing.
For example, first obtaining the Current projection position of the camera lens of the projector；Calculate the Current projection of the camera lens
Difference between best projection position corresponding to position and the Current projection position of the camera lens；Institute is calculated according to the difference
State camera lens moving distance to be moved；Make the mobile moving distance of the camera lens by the drive motor, makes described
Camera lens is located at the best projection position.
It follows that in present embodiment, compared to the prior art, the camera lens is woth no need to expending current location nx to zero
Two-way time between point o or between best projection position nbest to zero point o, automatic focusing speed faster, imitate by user experience
Fruit is more preferable.
In present embodiment, it can appoint to whether focusing being needed to judge, specifically when appearance is following before step S1
When one situation, it can determine that need to re-focuse: (1) when projector starting up；(2) projector detect itself vibration or
When displacement, specifically can sense whether have vibration or displacement by the built-in sensors of projector；(3) by predetermined time intervals
When the clarity discovery current projected picture of detection projected image is unintelligible, for example, it is primary every detection in 30 seconds；(4) by every
When predetermined time detection projector distance discovery Current projection distance changes etc..
Embodiment two
It please join shown in Fig. 4, present embodiment is substantially the same with embodiment one, and difference, which is to obtain, is obtaining the best projection position
The method set is different:
Step S21, the best projection position of corresponding camera lens when clearest projected image is obtained；
Incorporated by reference to shown in Fig. 5, specifically, obtaining the best projection position using telemetry, including such as in this step S21
Lower step:
Step S211, the camera lens is pre-established to the projector distance of projection screen and the clearest projected image of the camera lens
The corresponding relationship of best projection position corresponding to (clearest focusing parameter).
In present embodiment, the corresponding relationship such as the following table 1 mapping table:
1 mapping table of table
| Serial number | The vertical range L of camera lens and projection screen | Lens location M corresponding to clearest focusing parameter |
| 1 | L1 | Mbest1 |
| 2 | L2 | Mbest2 |
| 3 | L3 | Mbest3 |
| …… | …… | …… |
| n-1 | Ln-1 | Mbestn-1 |
| n | Ln | Mbestn |
The i.e. described corresponding relationship have n position M:Mbest1, Mbest2 corresponding to n clearest focusing parameters,
Mbest3 ..., Mbestn-1, Mbestn, position corresponding to each clearest focusing parameter corresponds to a mirror
Head and vertical range L:L1, L2 of projection screen, L3 ..., Ln-1, Ln.Wherein n is the integer more than or equal to 2.
Step S212, Current projection distance when detection projection between the camera lens and Current projection screen.
Incorporated by reference to shown in Fig. 6, obtained specifically, Current projection distance surveys 61 by distance measuring sensor, the ranging passes
Sensor 61 is infrared distance sensor or ultrasonic distance-measuring sensor etc..
In present embodiment, the distance measuring sensor 61 is used to obtain the camera lens 63 and projection screen 64 of the projector 62
Vertical range, the distance measuring sensor 61 includes at least two, obtains the first of the camera lens 63 and projection screen 64 respectively
Vertical range d1 and the second vertical range d2, when adjusting the position of the projector 62 makes d1=d2, the first vertical range d1
Or the second vertical range d2 is determined as the Current projection distance Lx.
In this step, more preferably, including another situation: working as between the camera lens and Current projection screen when projecting
Front projection distance not equal to the camera lens and any one of vertical range L of projection screen in the corresponding relationship, then by with
Lower method is handled, and is for Lx with the Current projection of the detected camera lens and projection screen distance (practical projector distance)
Example, specifically includes:
Step A, analysis obtains two adjacent projector distances in the corresponding relationship, and the Current projection distance is located at
Between two adjacent projector distances.
Step B, compare in the two adjacent projector distances obtained in the corresponding relationship with the current throwing
Shadow distance closer to one.
Step C, by two adjacent projector distances with the Current projection distance closer to one etc.
It is same to be confirmed as the Current projection distance.
For example, the vertical range that Current projection distance Lx is located at the camera lens and projection screen in the corresponding relationship is
Between L50 and L51；It is closer which compares between Current projection distance Lx and two distances again, that is, judges that Lx and L50 is closer also
It is Lx and L51 closer (if Lx distance L51 is closer)；Then L51 is equal and thinks the Current projection distance Lx, that is, think Lx=
L51.The step makes the sensitivity of the projector automatic focusing method higher, and customer experience effect is more preferable.
Step S213, the Current projection is obtained apart from corresponding best projection position according to the corresponding relationship.
Continue with above-mentioned example explanation, at this point, according to corresponding relationship, can get Current projection distance Lx is L51, then when
Front projection is Mbest51 apart from corresponding best projection position.
Step S22, the camera lens is driven to be moved to the best projection position from current location by drive motor.
The camera lens, which is controlled, by drive motor is moved to the corresponding clearest focusing ginseng of projector distance L51 from current location
The best projection position Mbest51 of the corresponding camera lens of number, completes focusing.
Incorporated by reference to shown in Fig. 7, step S22 specifically comprises the following steps:
Step S221, the current location Mbestx of the camera lens is obtained；
Step S222, the Current projection distance Lx(of the current location Mbestx and the camera lens that calculate the camera lens are at this time
Lx=L51) corresponding to best projection position Mbest51 between lens location difference, i.e. Mbestx- Mbest51；
Step S223, camera lens moving distance to be moved is calculated according to the lens location difference；
Step S224, the mobile moving distance of the camera lens is made by the drive motor, the camera lens is made to be located at institute
State best projection position.
In present embodiment, it should be noted that: when projector is switched on, it can first control camera lens and be moved to a position, and
Using the corresponding projector distance in the position as the sensing the feedback of position of actual range Lx, automatic focusing above-mentioned is then carried out.
Please refer to shown in Fig. 8, the present invention also provides a kind of projectors 80, comprising: camera lens 81, drive motor 82,
Distance measuring sensor 83, memory 84 and processor 85, the drive motor 82, distance measuring sensor 83 and memory 84 respectively with institute
State the connection of processor 85.For above-described embodiment two in conjunction with the projector automatic focusing method:
The camera lens 81 is used to projection screen light emission to form projected image.
The drive motor 82 is for driving the camera lens 81 mobile.
The distance measuring sensor 83 is used to measure the vertical range of the camera lens 81 to the projection screen.Specifically, this
In embodiment, the distance measuring sensor 83 can be infrared distance sensor or ultrasonic distance-measuring sensor, its certain type is simultaneously
It is without being limited thereto.
The memory 84 is for storing projector distance and institute of the camera lens 81 pre-established to the projection screen
State the corresponding relationship of best projection position corresponding to the clearest projected image of camera lens 81.
It should be noted that the memory 84 can be individual hardware configuration, or be integrated in the processing
Functional module in device 85, this is all feasible.
The processor 85 for read the corresponding relationship in the memory 84 and control the drive motor 82,
The distance measuring sensor 83 executes the method and step of the implementation column two of above-mentioned projector automatic focusing method to realize automatic focusing.
Compared with the relevant technologies, projector automatic focusing method of the invention and projector are by obtaining clearest perspective view
As when the corresponding camera lens best projection position, then drive the camera lens to be directly moved to the institute of camera lens by drive motor
It states best projection position and realizes automatic focusing, this method directly acquires the best of corresponding camera lens when clearest projected image
Projected position eliminates and is reconverted into corresponding best projection position by obtaining best projection focusing parameter or focusing focal length
Process, so that this method is simpler, automatic focusing speed is fast；In addition, after this method obtains best projection position, directly by camera lens
It is moved to the best projection position and realizes focusing, be moved to the best projection position again without returning to camera lens adjustment after zero point,
Realize faster automatic focusing function, so that the automatic focusing speed of the projector is fast, sensitivity is higher.
It should be noted that each embodiment above by reference to described in attached drawing is only to illustrate the present invention rather than limits this
The range of invention, those skilled in the art should understand that, it is right under the premise without departing from the spirit and scope of the present invention
The modification or equivalent replacement that the present invention carries out, should all cover within the scope of the present invention.In addition, signified unless the context
Outside, the word occurred in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of in combination with any other embodiment all or part of come using.
Claims (10)
1. a kind of projector automatic focusing method, which is characterized in that the projector includes the camera lens that can be moved forward and backward along optical axis,
The drive motor for driving the camera lens mobile, the projector automatic focusing method include the following steps:
Obtain the best projection position of corresponding camera lens when clearest projected image；
The camera lens is driven to be moved to the best projection position from current location by drive motor.
2. projector automatic focusing method according to claim 1, which is characterized in that obtain clearest perspective view described
As when the corresponding camera lens best projection position step in, the best projection position, packet are obtained using image analytical method
Include following steps:
The camera lens is adjusted to zero；
It focuses since the zero point, and detection is synchronized to the clarity of projected image, until obtaining clearest figure
Picture, the camera lens corresponding best projection position when record obtains the clearest projected image.
3. projector automatic focusing method according to claim 2, which is characterized in that the zero point is the tune of the camera lens
Burnt starting point or focusing terminal.
4. projector automatic focusing method according to claim 3, which is characterized in that the zero point is the lens focus
Mechanical zero or electronics zero point or optoelectronic induction zero point or electromagnetic induction zero point.
5. projector automatic focusing method according to claim 1, which is characterized in that obtain clearest perspective view described
As when the corresponding camera lens best projection position step in, the best projection position is obtained using telemetry, including such as
Lower step:
It pre-establishes corresponding to clearest projected image of the projector distance of the camera lens to projection screen with the camera lens most
The corresponding relationship of good projected position；
Current projection distance when detection projection between the camera lens and Current projection screen；
Best projection position of the Current projection apart from the corresponding camera lens is obtained according to the corresponding relationship.
6. projector automatic focusing method according to claim 5, which is characterized in that the mirror in detection projection
Head Current projection screen between Current projection apart from the step of in, further include following steps:
Analysis obtains two adjacent projector distances in the corresponding relationship, and the Current projection distance is located at this two
Between the adjacent projector distance；
Compare in the two adjacent projector distances obtained in the corresponding relationship and is more leaned on the Current projection distance
Close one；
By in two adjacent projector distances with the Current projection distance closer to one be equal and be confirmed as institute
State Current projection distance.
7. projector automatic focusing method according to claim 6, holds sign and be, driven described by drive motor
The camera lens was moved in the step of best projection position, was included the following steps:
Obtain the current location of the camera lens；
Calculate the camera lens the current location and the camera lens Current projection apart from corresponding best projection position it
Between lens location difference；
Camera lens moving distance to be moved is calculated according to the lens location difference；
Make the mobile moving distance of the camera lens by the drive motor, the camera lens is made to be located at the best projection
Position.
8. projector automatic focusing method according to claim 5, which is characterized in that the mirror in detection projection
Current projection between head and Current projection screen apart from the step of in, Current projection distance passes through distance measuring sensor survey
?.
9. projector automatic focusing method according to claim 8, which is characterized in that the distance measuring sensor is for obtaining
The vertical range of the camera lens and projection screen includes at least two, obtains the first of the camera lens and projection screen respectively
Vertical range and the second vertical range, the position for adjusting the projector make first vertical range be equal to described second vertically
Apart from when, first vertical range or second vertical range are determined as the Current projection distance.
10. a kind of projector characterized by comprising
Camera lens, for going out to projection screen light emission to form projected image；
Drive motor, for driving the camera lens mobile；
Distance measuring sensor, for measuring the vertical range of the camera lens to the projection screen；
Memory, for store the camera lens pre-established to the projection screen projector distance and the camera lens it is most clear
The corresponding relationship of best projection position corresponding to clear projected image；And
Processor, for reading the corresponding relationship in the memory and controlling the drive motor and ranging sensing
Device executes the step of claim 1 ~ 9 described in any item projector automatic focusing methods；
The drive motor, distance measuring sensor and memory are connected to the processor respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710716797.9A CN109426060A (en) | 2017-08-21 | 2017-08-21 | Projector automatic focusing method and projector |
| PCT/CN2017/114732 WO2019037326A1 (en) | 2017-08-21 | 2017-12-06 | Automatic focusing method for projector and projector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710716797.9A CN109426060A (en) | 2017-08-21 | 2017-08-21 | Projector automatic focusing method and projector |
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| CN110996085A (en) * | 2019-12-26 | 2020-04-10 | 成都极米科技股份有限公司 | Projector focusing method, projector focusing device and projector |
| CN111464091A (en) * | 2020-04-08 | 2020-07-28 | 成都极米科技股份有限公司 | Control method and control device of shift motor and projection system |
| CN111504221A (en) * | 2020-05-15 | 2020-08-07 | 苏州精濑光电有限公司 | Screen image focus tracking device and method thereof |
| CN111970500A (en) * | 2020-08-13 | 2020-11-20 | 峰米(北京)科技有限公司 | Automatic distance step calibration method and system for projection equipment |
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| CN112799275B (en) * | 2019-11-13 | 2023-01-06 | 青岛海信激光显示股份有限公司 | Focusing method and focusing system of ultra-short-focus projection lens and projector |
| CN112799275A (en) * | 2019-11-13 | 2021-05-14 | 青岛海信激光显示股份有限公司 | Focusing method and focusing system of ultra-short-focus projection lens and projector |
| CN110996085A (en) * | 2019-12-26 | 2020-04-10 | 成都极米科技股份有限公司 | Projector focusing method, projector focusing device and projector |
| 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 |
| CN111464091B (en) * | 2020-04-08 | 2021-12-03 | 成都极米科技股份有限公司 | Control method and control device of shift motor and projection system |
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| CN111504221A (en) * | 2020-05-15 | 2020-08-07 | 苏州精濑光电有限公司 | Screen image focus tracking device and method thereof |
| CN111970500A (en) * | 2020-08-13 | 2020-11-20 | 峰米(北京)科技有限公司 | Automatic distance step calibration method and system for projection equipment |
| CN112367544A (en) * | 2020-10-31 | 2021-02-12 | 上海凝汐智能科技发展有限公司 | Control system and method for compensating projection distance of projector and laser television |
| CN113900346A (en) * | 2021-08-30 | 2022-01-07 | 安克创新科技股份有限公司 | Automatic focusing method of projector and projector |
| WO2023030066A1 (en) * | 2021-08-30 | 2023-03-09 | 安克创新科技股份有限公司 | Calculation method for non-inductive auto focus of projector |
| CN113900346B (en) * | 2021-08-30 | 2023-08-29 | 安克创新科技股份有限公司 | Automatic focusing method of projector and projector |
| CN114727079A (en) * | 2021-11-16 | 2022-07-08 | 海信视像科技股份有限公司 | Projection equipment and focusing method based on position memory |
| WO2023087960A1 (en) * | 2021-11-16 | 2023-05-25 | 海信视像科技股份有限公司 | Projection device and focusing method |
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