CN206930429U - The device and virtual reality helmet of lens back focal length are determined using camera - Google Patents
The device and virtual reality helmet of lens back focal length are determined using camera Download PDFInfo
- Publication number
- CN206930429U CN206930429U CN201720760458.6U CN201720760458U CN206930429U CN 206930429 U CN206930429 U CN 206930429U CN 201720760458 U CN201720760458 U CN 201720760458U CN 206930429 U CN206930429 U CN 206930429U
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- lens
- camera
- display screen
- focal length
- back focal
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Abstract
The utility model discloses a kind of device and virtual reality helmet that lens back focal length is determined using camera, the device is applied to lens module, and the lens module includes lens and display screen；Described device also includes being used for the moving control mechanism for controlling the display screen movement；The camera and the display screen are located at the front and rear sides of lens respectively, and make the camera lens optical axis of the camera and the normal parallel of the display screen, the camera lens of the camera conllinear with the optical axis of the lens；The focal length when calibrated focal length of the camera is the theoretical virtual image that the camera shoots the lens generation.It is arranged such, the device provided by the utility model that lens back focal length is determined using camera, it can accurately and accurately detect the back focal length of VR lens.
Description
Technical field
Optical technical field is the utility model is related to, lens back focal length is determined using camera more specifically to one kind
Device and virtual reality helmet.
Background technology
With the development of micro display technology, software and hardware technology and optical design process technology, VR (Virtual Reality,
Virtual reality) technology and industry be also further ripe.In the prior art, VR is often (saturating using the lens of a diameter of 30~60mm bores
Mirror) magnifying glass is used as, the image on display screen is projected in human eye.
For image on display screen by lens projects into human eye, the actual back focal length of lens is to influence eye-observation to figure
The major influence factors of image sharpness, therefore, how high efficiency and the back focal length of lens is accurately detected out, turn into this area
Technical staff's important technological problems to be solved.
Utility model content
The purpose of this utility model is to provide a kind of device for determining lens back focal length using camera, its can efficiently,
Accurately detect out the back focal length of VR lens.The purpose of this utility model, which also resides in, provides a kind of virtual reality helmet.
The utility model additionally provides a kind of device that lens back focal length is determined using camera, and described device is applied to lens
Module, the lens module include lens and display screen；
Described device also includes being used for the moving control mechanism for controlling the display screen movement；
The camera and the display screen are located at the front and rear sides of lens respectively, and make camera lens optical axis and the institute of the camera
Normal parallel, the camera lens of the camera for stating display screen are conllinear with the optical axis of the lens；
The focal length when calibrated focal length of the camera is the theoretical virtual image that the camera shoots the lens generation.
Preferably, the test board of the calibrated focal length for aiding in determining the camera is included.
Preferably, the display screen is arranged within one times of focal length of the lens.
The utility model additionally provides a kind of virtual reality helmet, including at least one lens module, the lens
Module includes lens and display screen, and the display location is in the preset range of back focal length for being arranged at the lens, wherein institute
The back focal length for stating lens is determined using the device described in any of the above-described.
Preferably, the display screen is arranged in the back focal length of the lens.
Preferably, pad is provided between the display screen and the lens, the display screen is arranged at the lens
In back focal length.
Preferably, the virtual reality helmet includes the first lens module and the second lens module, and described first is saturating
Mirror module, which includes the first lens and the first display screen, the second lens module, includes the second lens and second display screen；It is described
First lens are identical with second lens and are located at same horizontal line, and first display screen is identical with the second display screen
And it is located at same horizontal line.
In technical scheme provided by the utility model, first, the position of camera and display screen is adjusted, so that lens are located at phase
Between machine and display screen, and it is total to the camera lens optical axis of camera and the optical axis of the normal parallel of display screen, the camera lens of camera and lens
Line, so, the light that display screen is sent are emitted approximately parallel light after lens transmission, and camera can photograph normally
Amplify the virtual image.
Then, calibrated focal length during the theoretical virtual image of camera capture lens generation is obtained, the theoretical virtual image refers to display screen
The position for the virtual image that can be generated, it is the theoretical virtual image position when being placed on the theoretical back focal length position of lens.
Then, the display screen is adjusted to the distance of the lens by moving control mechanism, and by camera to lens
The virtual image of the display screen of generation is shot, and record the distance between rear surface of display screen and lens and with this apart from right
The photo for the camera shooting answered, such as, when display screen often moves 0.001 millimeter forward or backward, the virtual image is entered by camera
Row is once shot.
Finally, the distance between rear surface of display screen and lens corresponding to definition highest photo is determined, is
The back focal length of lens.It should be noted that camera shoots multiple pictures, when determining definition highest photo, each need to be contrasted
The definition of photo, and then definition highest photo can be determined, such as, (it can be adjusted by contrasting the MTF of each photo
Modulation trnasfer function) clear photograph the most is determined, certainly, also can be by contrasting other technologies that can reflect image definition
Parameter is determined, and is no longer introduced one by one herein.
In this way, according to device provided by the utility model, VR lens back focal length can be quickly and accurately detected.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram for the device for determining lens back focal length in the utility model embodiment using camera；
Fig. 2 is the relation schematic diagram of the distance between display screen and lens and image definition；
Fig. 3 is camera focus and image definition relation schematic diagram.
In Fig. 1：
Camera -11, lens -12, display screen -13.
Embodiment
The purpose of this utility model is to provide a kind of device for determining lens back focal length using camera, its can efficiently,
Accurately detect out the back focal length of VR lens.
Hereinafter, embodiment is illustrated referring to the drawings.In addition, embodiments illustrated below is not to described in claim
Utility model content rise any restriction effect.In addition, the full content of the composition represented by example below is not limited to conduct
Necessary to the solution of utility model described in claim.
In order to make it easy to understand, Fig. 1 is refer to, and the device that lens back focal length is determined using camera that the present embodiment provides, bag
Include camera 11, display screen 13 and the moving control mechanism moved for control display screen 13；
Camera 11 and display screen 13 are located at the front and rear sides of lens 12 respectively, and make the camera lens optical axis and display screen of camera 11
13 normal parallel, the camera lens of camera 11 are conllinear with the optical axis of lens 12；
The focal length when calibrated focal length of camera 11 is the theoretical virtual image of the capture lens 12 of camera 11 generation.
It is arranged such, the device provided by the present embodiment, can determine the back focal length of lens, specifically can be as described below.
First, adjust the position of camera 11 and display screen 13, be located at the front and rear sides of lens 12 respectively, and make camera 11
The normal parallel of camera lens optical axis and display screen 13, the camera lens of camera 11 are conllinear with the optical axis of lens 12, and so, display screen 13 is sent
Light be emitted approximately parallel light after the transmission of lens 12, camera 11 can photograph the void of the display screen of lens generation
Picture.
Then, calibrated focal length during the theoretical virtual image that the capture lens 12 of camera 11 generate is obtained, the theoretical virtual image refers to show
The position for the virtual image that can be generated, it is the theoretical virtual image position when display screen 13 is placed on the theoretical back focal length position of lens 12.
Then, display screen 13 is moved forward and backward along normal direction, to adjust display screen to the distance of lens, and passes through camera 11
The virtual image generated to lens 12 is shot, and record the distance between rear surface of display screen 13 and lens 12 and with this away from
From the photo of corresponding camera 11 shooting, such as, when display screen 13 often moves 0.001 millimeter forward or backward, pass through camera
11 pairs of virtual images are once shot.
Finally, the distance between display screen 13 and lens corresponding to definition highest photo are determined, as lens
Back focal length, as shown in Fig. 2 Fig. 2 is the relation schematic diagram of the distance between display screen and lens and image definition.
In this way, according to device provided by the utility model, VR lens back focal length can be quickly and accurately detected.
It should be noted that above-mentioned test process is focused in the theoretical virtual image distance of Lens Design to be tested based on camera 11
Place, and need to carry out calibration processing to camera 11 before this.Specifically, a testing standard plate is positioned over theoretical virtual image distance first
Place, then control camera 11 to focus testing standard plate, obtain the relation of focal length and definition, find definition peak
Calibrated focal length during the theoretical virtual image of corresponding focal length value, as camera capture lens generation, as shown in figure 3, Fig. 3 is that camera is burnt
Away from image definition relation schematic diagram.
In addition, in the present embodiment, in order to improve testing efficiency, the initial position of display screen 13 is arranged at one times of lens 12
Within focal length, i.e. display screen 13 is apart from lens 12, in this way, the initial position of display screen 13 is close to the back focal length position of lens 12
Put, can rapidly test the back focal length of lens 12.
Further, in the present embodiment, when moving forward and backward display screen 13 along normal direction, display screen 13 shows RGB figures
Picture, the virtual image is away from corresponding wavelength size when can specifically combine the design of lens 12.
In addition, in the present embodiment, display screen 13 can be driven by stepper motor and be moved.Stepper motor can be controlled accurately
The movement of display screen 13 processed, and then the back focal length of lens can be accurately detected out.
In order to facilitate different lens are tested, in the present embodiment, can also include being used for the bearing fixture for carrying lens 12,
To change different lens 12.
Below, the present embodiment will combine specific data, and this programme is described in detail.
In the present embodiment, if the effective focal length design load of lens is 42mm, the virtual image is lens corresponding to 1.5M away from design load
Afterwards surface to the distance between display screen 13 be 40.55mm.The effective focal length of the camera 11 of selected test system is 160mm,
F#3.5,3 μm of Pixel Dimensions, allow disperse circular diameter to take 6 μm, adjust camera focal distance 1.5m, the camera depth of field can be calculated
Scope is 1498mm-1502mm.According to object-image relation as object distance change ± 0.005mm, the virtual image can be caused away from changing about 6mm,
The precision of camera 11 is enough to identify the variable quantity.
Same lens are detected by the above-mentioned test system, obtain image definition corresponding to each stepping position
Information.It is as shown in the table：
According to the above results, then the stepping position of stepper motor and the functional relation of definition, the maximum of definition are obtained
Step corresponding to value is then optimum state.The now measurement calibration information of binding test system, then can directly read measured lens
Back focal length numerical value.The step motion control precision of the precision of the test system and display screen 13, the camera 11 of test system are relevant.
In the parameter of camera 11 that the present embodiment refers to, when the precision of step motion control reaches ± 0.005mm precision, the essence of the test system
Spend about 0.01mm.
The present embodiment additionally provides a kind of virtual reality helmet, including at least one lens module, lens module bag
Lens and display screen are included, display location is in the preset range of back focal length for being arranged at lens, and wherein the back focal length of lens uses
Device in above-described embodiment determines.
Further, display screen is just arranged in the back focal length of lens, is arranged such, and can reach preferable vision effect
Fruit.In order to facilitate regulation the distance between display screen and lens, pad is provided between display screen and lens, display screen is arranged at
In the back focal length of lens.So, can be real by the thickness of adjust pad when needing to adjust the distance between display screen and lens
The distance regulation of existing display screen and lens.
In the present embodiment, virtual reality helmet can include the first lens module and the second lens module, and first is saturating
Mirror module, which includes the first lens and the first display screen, the second lens module, includes the second lens and second display screen.
Wherein, the first lens and the second lens are identical and be located at same horizontal line, the first display screen and second display screen phase
With and be located at same horizontal line.It is arranged such, the stereo display effect of virtual reality helmet can be realized.
Progressive mode is used to carry out this programme above for example, the scheme in above-mentioned each embodiment can be only
Vertical technical scheme can be also overlapped mutually.The foregoing description of the disclosed embodiments, make professional and technical personnel in the field
It can realize or using the utility model.A variety of modifications to these embodiments will be for those skilled in the art
It will be apparent that generic principles defined herein can in the case where not departing from spirit or scope of the present utility model,
Realize in other embodiments.Therefore, the utility model is not intended to be limited to the embodiments shown herein, but to accord with
Close the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (7)
1. a kind of device that lens back focal length is determined using camera, it is characterised in that described device is applied to lens module, described
Lens module includes lens and display screen；
Described device also includes being used for the moving control mechanism for controlling the display screen movement；
The camera and the display screen are located at the front and rear sides of lens respectively, and the camera lens optical axis of the camera is shown with described
The normal parallel of display screen, the camera lens of the camera are conllinear with the optical axis of the lens；
The focal length when calibrated focal length of the camera is the theoretical virtual image that the camera shoots the lens generation.
2. the device of lens back focal length is determined using camera as claimed in claim 1, it is characterised in that also include being used to aid in
Determine the test board of the calibrated focal length of the camera.
3. the device of lens back focal length is determined using camera as claimed in claim 2, it is characterised in that the display screen is set
Within one times of focal length of the lens.
4. a kind of virtual reality helmet, it is characterised in that including at least one lens module, the lens module includes saturating
Mirror and display screen, the display location in the preset range of back focal length for being arranged at the lens, wherein, after the lens
Focal length is determined by the device as described in claim any one of 1-3.
5. virtual reality helmet according to claim 4, it is characterised in that the display screen is arranged at the lens
Back focal length on.
6. virtual reality helmet according to claim 5, it is characterised in that between the display screen and the lens
Pad is provided with, the display screen is arranged in the back focal length of the lens.
7. according to the virtual reality helmet described in claim any one of 4-6, it is characterised in that the virtual reality is worn
Equipment includes the first lens module and the second lens module, the first lens module include the first lens and the first display screen,
The second lens module includes the second lens and second display screen；First lens are identical with second lens and are located at
Same horizontal line, first display screen is identical with the second display screen and is located at same horizontal line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720760458.6U CN206930429U (en) | 2017-06-27 | 2017-06-27 | The device and virtual reality helmet of lens back focal length are determined using camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720760458.6U CN206930429U (en) | 2017-06-27 | 2017-06-27 | The device and virtual reality helmet of lens back focal length are determined using camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206930429U true CN206930429U (en) | 2018-01-26 |
Family
ID=61353810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720760458.6U Withdrawn - After Issue CN206930429U (en) | 2017-06-27 | 2017-06-27 | The device and virtual reality helmet of lens back focal length are determined using camera |
Country Status (1)
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| CN (1) | CN206930429U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101808A (en) * | 2017-06-27 | 2017-08-29 | 歌尔科技有限公司 | Method, device and the virtual reality helmet of lens back focal length are determined using camera |
| CN108769668A (en) * | 2018-05-31 | 2018-11-06 | 歌尔股份有限公司 | Method for determining position and device of the pixel in VR display screens in camera imaging |
| CN111965781A (en) * | 2020-08-28 | 2020-11-20 | 广东九联科技股份有限公司 | VR lens barrel focal length electric adjustment control method, system and device |
-
2017
- 2017-06-27 CN CN201720760458.6U patent/CN206930429U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101808A (en) * | 2017-06-27 | 2017-08-29 | 歌尔科技有限公司 | Method, device and the virtual reality helmet of lens back focal length are determined using camera |
| CN107101808B (en) * | 2017-06-27 | 2023-07-14 | 歌尔光学科技有限公司 | Method and device for determining lens back focal length by adopting camera and virtual reality headset |
| CN108769668A (en) * | 2018-05-31 | 2018-11-06 | 歌尔股份有限公司 | Method for determining position and device of the pixel in VR display screens in camera imaging |
| CN111965781A (en) * | 2020-08-28 | 2020-11-20 | 广东九联科技股份有限公司 | VR lens barrel focal length electric adjustment control method, system and device |
| CN111965781B (en) * | 2020-08-28 | 2022-02-25 | 广东九联科技股份有限公司 | VR lens barrel focal length electric adjustment control method, system and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201016 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 266100 Qingdao, Laoshan District, North House Street investment service center room, Room 308, Shandong Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180126 Effective date of abandoning: 20230714 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180126 Effective date of abandoning: 20230714 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |