CN205594647U - A iris device for mobile client equipment - Google Patents
A iris device for mobile client equipment Download PDFInfo
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- CN205594647U CN205594647U CN201620302532.5U CN201620302532U CN205594647U CN 205594647 U CN205594647 U CN 205594647U CN 201620302532 U CN201620302532 U CN 201620302532U CN 205594647 U CN205594647 U CN 205594647U
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- iris
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Abstract
The utility model relates to an iris device for mobile client equipment, at least including the tight shot optical components that is used for the formation of image with arrange the image planes that this tight shot optical components rear end is used for catching the image in, still include to be used for increasing the object distance, to reduce the image distance, arrange in tight shot optical components front end, rear end or arrange in parallel refraction optical element between the tight shot optical components. Can can realize closely iris recognition function when taking into account functions such as the making a video recording basically of mobile client phone lens such as cell -phone, flat board, video recording through this iris device, improve the image quality of built -in camera lens simultaneously, improve the performance of whole system.
Description
Technical field
This utility model belongs to bio-identification and imaging field, particularly relates to a kind of iris device for mobile client device.
Background technology
The method of bio-identification is based on facial characteristics at present, such as iris.Iris identification method is the template identification technology by contrasting iris picture and the previous iris picture i.e. obtained, so that it is determined that and identify this target.
Encode iris imaging digital template, iris imaging digital template and the iris imaging digital template contrast of previous coding first with mathematics and statistical algorithms specifically, be used for positioning pairing, so that it is determined that and identify target.Corresponding iris identification equipment includes the imaging device capturing target iris and contrast capture picture and had previously stored iris as the image processor of information.Imaging device and image processor can be separation equipment or unit equipment.
Along with the mankind are to privacy and the attention of safety, need urgently to add iris identification device in the mobile client devices such as mobile phone, panel computer or notebook.It is well known, however, that the mobile client device camera lens such as mobile phone, panel computer is generally general camera lens, it is mainly used in photographed and people.The most different with the iris imaging of bio-identification.Given iris dimensions, the Pixel Dimensions of the specific sensor of the mobile client device camera lens such as mobile phone, flat board, given object distance (iris distance iris identification setting position is fixed), configuring this camera lens goes capture to have the iris picture of suitable iris radius in image space, and specific capture region defines identification distance (typically this distance is much smaller than photo distance) of iris imaging.According to long-term design experiences, focusing imaging device for embedded in mobile phone, the imaging device for iris imaging requires that the target iris optimal moving range in optical module thing side is within 250mm.By contrast, it is desirable within target object is placed on the 250mm of optical module thing side of Optical devices, the basic function for mobile client camera lens modules such as photography, video recordings is the most inappropriate.
The seizure of iris image depends on infrared wavelength, rather than the seizure of iris image generally utilizes IR-cut filter part to go to weaken infrared light, arrives sensor by visible wavelength, it is achieved the function of imaging.
Existing change camera object plane technical scheme many employings Zoom lens apparatus, now lens subassembly includes multiple single lens, and these lens can slide axially along lens subassembly, thus changes focal length and amplification.But zoom lens group price comparison is expensive and with tight shot group phase specific volume relatively greatly, is not suitable for the built-in application at cell phone apparatus.Therefore in the mobile client device such as mobile phone, panel computer, often utilize tight shot.For tight shot, if changing object plane, image plane also can be moved.When image plane is not at sensor surface, this will cause collecting defocused image at sensor surface.Configuring a camera lens module seizure one has the iris image of suitable diameter to need a specific target range obviously in iris image plane.The iris demand of main body (distance depend on), the object plane of the object plane photographic objects to be much smaller than at iris place, now suppose that the image plane of iris is exactly the imaging surface of detector, the object plane of photographic objects is more remote than iris object plane, according to optical imaging concept, before now the image planes of photographic objects are positioned at detector i.e. iris image plane, a disc of confusion will be formed the most on the detector, the movement of object plane causes the movement of image plane, and this moves and can not be compensated by fixed-focus system.This problem will be produced, because object plane is significantly different relative to the optical module position of Optical devices under both patterns in commonness photograph pattern and iris identification pattern when switching when configuring a photographic head.Now, reference object removes to obtain the image of suitable definition and details, and mobile phone arranges middle Built-in lens can not realize the integrated application of iris imaging and the function such as photography, video recording.
Utility model content
In view of in the mobile client imaging device such as mobile phone, flat board, optical lens module relative sensors is irremovable, this utility model provides a kind of effective and cheap method, object distance is changed, it is achieved in same object distance to iris and the purpose of photography blur-free imaging by inserting refraction optical element (such as parallel flat).Premise is that (1) lens subassembly focal length is constant, and the spacing of (2) rear surface lens and sensor surface is constant.Meanwhile, this utility model also illustrates the difference same impact on light path of parallel flat position in the optical path.
For achieving the above object, the technical scheme that this utility model provides is:
A kind of iris device for mobile client device, at least include for the tight shot optical module of imaging and be placed in this tight shot optical module rear end in order to catch the image planes of image, it is characterized in that, also includes increasing object distance, reduces image distance and be placed in the refraction optical element between described tight shot optical module front end, rear end or described tight shot optical module.
This utility model uses technique scheme, having the advantage that can be while the function such as basic shooting, the video recording that take into account the mobile client mobile lens such as mobile phone, flat board, realize iris identification, improve the image quality of Built-in lens simultaneously, thus improve the performance of total system.The universality applied in lens design in view of optical filter, and belong to the one of parallel flat, therefore this utility model is as a example by optical filter, illustrates.
Accompanying drawing explanation
Fig. 1 a: the optical module schematic diagram of built-in mobile phone camera lens free of light filter；
Fig. 1 b: built-in mobile phone lens optical assembly free of light filter is through zemax software emulation result figure；
The combinative optical system sketch of Fig. 2: built-in camera free of light filter；
The mobile device built-in camera optical module model of Fig. 3 a: prefilter；
The mobile device built-in camera optical module of Fig. 3 b: prefilter is through the emulation datagram of zemax；
The combinative optical system sketch of the mobile device built-in camera of Fig. 3 c: prefilter；
The mobile device built-in camera optical module model of Fig. 4 a: rearmounted optical filter；
The mobile device built-in camera optical module of Fig. 4 b: rearmounted optical filter is through the emulation datagram of zemax；
The combinative optical system sketch of the mobile device built-in camera light of Fig. 4 c: rearmounted optical filter.
In figure: I, convex lens；II, concavees lens；III, the second convex lens；IV, image planes；V, refraction optical element；1., first surface of I, 2., second surface of I；3., first surface of II, 4., second surface of II；5., first surface of III, 6., second surface of III；1, focal plane, thing side；Focal plane, thing side after 1', prefilter；2, thing side's principal plane；3, the thing side's principal plane after prefilter；4, image space principal plane, 5, the image space principal plane of rearmounted optical filter；6, image space focal plane；6', the image space focal plane of rearmounted optical filter；7 (IV), image planes.
Detailed description of the invention
The identification of iris imaging is apart from the photo distance of the most common intelligent mobile terminal Built-in lens, cause mobile device can not realize when focusing camera assembly shooting at close range simultaneously commonly image the problem with iris identification, a kind of effective and cheap method is provided for explanation this utility model, go to change object distance by inserting parallel flat, realize in same object distance iris and the purpose of photography blur-free imaging, simultaneously in order to the difference same impact on light path of parallel flat position in the optical path is described.Now enumerate each embodiment.According to relation between image in Gauss formulaUnderstanding: in the case of focal length is constant, object distance increases, and image distance reduces.Image distance reduces, and object distance increases.I.e. there is the parallel flat of certain refractive index by focusing imaging optics increases existing mobile terminal device built-in, to change object distance or image distance, realize changing image distance or object distance on the premise of not increasing the existing built-in size focusing imaging optics, finally realize while the functions such as basic shooting, the video recording taking into account the mobile client camera lens such as mobile phone, flat board, it is achieved iris identifying function.
Zemax simulation software is utilized to carry out emulating mobile lens model free of light filter, it is the optical module (including imaging lens group and image planes) of built-in mobile phone camera lens free of light filter as shown in Figure 1a, it is characterized in that there is the angle of visual field 58 °, focal length is 1.9mm, overall length is 2.26mm, and relative aperture is the mobile lens of f/2.4.Wherein I is first eyeglass, for convex lens, near thing side, is 1. first surface of I, is 2. second surface of I；II be second eyeglass be concavees lens, be 3. first surface of II, be 4. second surface of II；III be the 3rd eyeglass be convex lens, be 5. first surface of III, be 6. second surface of III；IV is image planes (sensor covers).And Fig. 1 b is the simulation result through zemax.
Knowable to Fig. 1 b, optics principal plane locations is: thing side: 0.193410mm, image space :-1.609625mm, according to optical theory, as in figure 2 it is shown, any combinative optical system can simply be seen as having a thing side principal point H, thing side's principal plane 2 from composition, one object focus F, focal plane, one thing side 1, an image space principal point H', 4, rear focus F' of an image space principal plane, one image space focal plane 6 and the system of image planes 7, the most as shown in Figure 2.Wherein AB is the vertical axle object with certain altitude, F, object focus and rear focus it is respectively at F' place, the perpendicular plane crossing object focus F and rear focus F' is focal plane, thing side 1 and image space focal plane 6, the plane at QH and Q'H' place is referred to as thing side's principal plane 2 and image space principal plane 4, corresponding H, H' is respectively thing side's principal point and image space principal point, f, f' is respectively thing side's focal length and image space focal length, it is positive and negative determines with principal point for initial point, if consistent with radiation direction to the direction of corresponding focus from principal point, be just, otherwise be then negative.L and l' is called object distance and image distance, and it is positive and negative determines with principal point for initial point, if the direction of object point is consistent with radiation direction on from principal point to axle, is just, otherwise is then negative.A'B' is object AB imaging after combinative optical system.Fig. 3 c, 4c is parallel flat (the i.e. refraction optical element V inserting respectively before and after combinative optical system and having certain refractive index, its material is optical glass or optical plastic, thickness is between 0.7mm～3.0mm) light path sketch, in the case of the focal length of holding means aforementioned mobile lens model and rear cut-off distance are constant, philosophy according to light, when currently putting parallel flat, thing side principal plane QH and thing side principal point H occurs rearmounted, object distance increases Δ l, when the rearmounted parallel flat with certain refractive index, image space principal plane occurs rearmounted, image distance reduces Δ l'.According to relation between image in Gauss formulaUnderstanding: image distance reduces, object distance increases.I.e., the no matter parallel flat object distance that all can increase preposition, rearmounted, thus realize for the mobile client device such as mobile phone, flat board taking into account in the same function apart from the common shooting of realization and iris identification.
A point different detailed description of the invention is described in detail below.
Embodiment 1
A kind of iris device for mobile client device as shown in Figure 3 a, at least include the imaging system of mobile client device, this imaging system is included refraction optical element V, convex lens I successively by left-to-right, concavees lens II, second convex lens III and image planes IV composition, wherein, 1. it is first surface of I, is 2. second surface of I；II be second eyeglass be concavees lens, be 3. first surface of II, be 4. second surface of II；III be the 3rd eyeglass be convex lens, be 5. first surface of III, be 6. second surface of III；7 is image planes (sensor covers).The central point of convex lens I, concavees lens II, the second convex lens III, image planes 7 and parallel flat V is located on the same line, wherein, the concave surface position of concavees lens II and the second convex lens III is contrary, refracting element V is in order to increase object distance, to realize in the case of less object distance, the function such as basic shooting, video recording taking into account the mobile client mobile lens such as mobile phone, flat board realizes the function of iris identification simultaneously.
Simulation result such as Fig. 3 b that device shown in Fig. 3 a is corresponding.In comparison diagram 3b and Fig. 1 b, the position of principal plane understands, and the position of thing side's principal plane 2 there occurs change, becomes 0.616158mm from 0.193410mm, and about 0.423mm is moved relative to original side's principal plane 2 position in thing side's principal plane 3 position.When optical filter (one of refraction optical element V) is preposition, compared with light path free of light filter, object distance increases.The optics that device shown in Fig. 3 a is corresponding simplifies figure such as Fig. 3 c, in the case of the focal length of this device aforementioned mobile lens model and rear cut-off distance are constant, understand refraction optical element V preposition time object distance increase, thus can solve closely to realize commonly imaging the problem taken into account with iris identifying function；In the present embodiment, refraction optical element V uses optical filter to have the property that the erect image that object always becomes equal size, and thing and picture are always at the homonymy of flat board, and deficiency and excess is inconsistent；No matter why object distance is worth, as the position relative to thing does not changes, represent as the distance relative to thing have with Δ l'
Analytical formula understands, Δ l' >=0, simultaneously by controlling the thickness of optical filter and selecting suitable material, candidate that can be artificial away from, and then while selecting suitable iris identification distance, take into account the basic camera function such as the imaging of mobile device, photography.
Embodiment 2
As Fig. 4 a be by rearmounted for optical filter to mobile phone or flat board photographic head the phantom after Zemax software processes, Fig. 4 b is simulation result, Fig. 4 c is optical filter rearmounted light path sketch, wherein H' is image space principal point, the plane at H'Q' place is image space principal plane 4, and F' is rear focus, and 6 is image space focal plane, f' is image space focal length, fs' for optical filter image space focal length time rearmounted, corresponding E' be optical filter rearmounted time rear focus, 5 be optical filter rearmounted time image space principal plane, 6' is the image space focal plane of rearmounted optical filter, and 7 is image planes i.e. sensitive detector receiving plane.A'B', AS'BS' be respectively the most free of light filter time picture and the picture of rearmounted optical filter.Knowable to Fig. 4 b, 4c, during rearmounted optical filter, image distance decreases, according to relation between image in Gauss formulaUnderstanding: image distance reduces, object distance increases, and simultaneously according to image-forming principle, actual pointing object should be a disc of confusion at the picture that detector face is formed, therefore, when as, during closer to detector face, the disc of confusion of single picture point is less, point picture element is apparent.Simultaneously, the position of principal plane in comparison diagram 4b and Fig. 1 b, when optical filter is rearmounted, image space principal plane 4 moves after there occurs, mobile size is 0.423mm, when optical filter is rearmounted, compared with light path free of light filter, image distance reduces, and object distance increases, thickness and the selection of material according to optical filter can reach increase object distance, and solve current mobile phone or panel computer closely cannot be carried out iris identification and defect that basic camera function is taken into account.
Embodiment 3
By embodiment 1 and 2, it is not difficult to draw by preposition for refraction optical element and the rearmounted scheme implemented simultaneously, the i.e. merging of the technical scheme that embodiment 1 and 2 provides, the further change to object distance can be realized further, it is easier to increase the object distance of iris imaging, while guaranteeing the functions such as shooting, video recording that existing intelligent mobile terminal equipment often has, it is achieved iris identification.In addition improve the image quality of Built-in lens, thus improve the overall performance of system.
In the various embodiments described above, refraction optical element V realizes the change to object distance and image distance, depend primarily on the physical characteristic of refraction optical element V itself, if its material can be optical glass or optical plastic, refractive index span is between 1.47～1.94, the more commonly used (such as SiO at 1.56 especially2).Thickness is between 0.7mm～3mm.
In view of the spectral distribution of natural light is relatively wide, for realizing mobile client product closely iris imaging and basic photography, imaging function simultaneously, refraction optical element V should possess certain filtering functions.
Claims (8)
1., for an iris device for mobile client device, at least include for imaging
Tight shot optical module and be placed in this tight shot optical module rear end in order to catch image
Image planes (IV), it is characterised in that: also include increasing object distance, reducing image distance, be placed in institute
State tight shot optical module front end, rear end or be placed between described tight shot optical module
Refraction optical element (V).
2., for an iris device for mobile client device, at least include for imaging
Tight shot optical module and after being placed in this tight shot optical module front end, rear end or be placed in institute
State the refraction optical element (V) between tight shot optical module, it is characterised in that: also wrap
Include to increase object distance, at least one refraction optical element (V) of minimizing image distance, this refraction
Optical element (V) is placed in described tight shot optical module front end, rear end or be placed in described fixed
Between zoom lens optical module.
3. the iris device for mobile client device as claimed in claim 1 or 2,
It is characterized in that: refraction optical element (V) material is optical glass or optical plastic.
4. the iris device for mobile client device as claimed in claim 1 or 2,
It is characterized in that: the thickness of refraction optical element (V) is between 0.7mm～3.0mm.
5. the iris device for mobile client device as claimed in claim 1 or 2,
It is characterized in that: the refractive index of refraction optical element (V) is between 1.47～1.94.
6. the iris device for mobile client device as claimed in claim 5, it is special
Levy and be: the refractive index of refraction optical element (V) is 1.56.
7. the iris device for mobile client device as claimed in claim 1 or 2,
It is characterized in that: refraction optical element (V) is parallel flat.
8. the iris device for mobile client device as claimed in claim 3, it is special
Levy and be: the thickness of refraction optical element (V) is between 0.7mm～3.0mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620302532.5U CN205594647U (en) | 2016-04-12 | 2016-04-12 | A iris device for mobile client equipment |
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| CN201620302532.5U CN205594647U (en) | 2016-04-12 | 2016-04-12 | A iris device for mobile client equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3612078A4 (en) * | 2016-10-17 | 2020-12-30 | Eyeque Inc. | An optical method to assess the refractive properties of an optical system |
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2016
- 2016-04-12 CN CN201620302532.5U patent/CN205594647U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3612078A4 (en) * | 2016-10-17 | 2020-12-30 | Eyeque Inc. | An optical method to assess the refractive properties of an optical system |
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