CN105138193A - Camera module for optical touch screen and lens thereof - Google Patents

Camera module for optical touch screen and lens thereof Download PDF

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Publication number
CN105138193A
CN105138193A CN201510569872.4A CN201510569872A CN105138193A CN 105138193 A CN105138193 A CN 105138193A CN 201510569872 A CN201510569872 A CN 201510569872A CN 105138193 A CN105138193 A CN 105138193A
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Prior art keywords
touch screen
camera module
optical touch
camera lens
lens
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CN201510569872.4A
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张扣文
俞丝丝
刘春梅
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Ningbo Sunny Opotech Co Ltd
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Ningbo Sunny Opotech Co Ltd
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Priority to CN201510569872.4A priority Critical patent/CN105138193A/en
Publication of CN105138193A publication Critical patent/CN105138193A/en
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Abstract

The invention discloses a camera module for an optical touch screen and a lens thereof. The lens of the camera module is designed in the mode that the focal length f of the lens is larger than 0.6 and smaller than 1.5. During MTF analysis, the space frequency is 651 p/mm; in a field range from 35 degrees to 60 degrees, testing data of the camera module meet the condition that MTFS is smaller than or equal to 0.05, and MTFT is larger than or equal to 0.3. Accordingly, during MTF presentation, the T direction is pulled up, and the S direction is pressed down. When the camera module is applied to the optical touch screen device, the optical touch screen device has the good sensitivity performance.

Description

For camera module and the camera lens thereof of optical touch screen
Technical field
The present invention relates to a camera module, particularly relate to the camera module of an optical touch screen, for utilizing optical image technology to obtain a touch-screen by the relative position of touch-control.
Background technology
Along with the development of mobile Internet and science and technology, and the growing with each passing day of multi-media information device, increasing equipment collocation uses touch-screen (touchscreen), is also called " touch screen " or " contact panel ".One of main application of touch-screen is the input media as a kind of computer installation, and it is regarded as a kind of simple, convenient and direct man-machine communication interface.Utilize this technology, when user directly use touch control component or use finger touching display screen on icon or word after, just can directly excite main frame to go to carry out operating or operating.So, make the use of man-machine communication interface more direct, also allow the various equipment of operation more easy and convenient simultaneously.Especially, after can taking the appearance of intelligent mobile device, touch technology, from the application of the original man-computer interface such as production board, computing machine, atm device, strides into the field of personal electric product.Further, touch screen technology is now constantly perfect so far, and current technology has allowed touch-screen reach to be easy to and used, sturdy and durable, reaction velocity fast, save space, be easy to the advantages such as interchange.
The nearly several large class of current touch screen technology: resistance-type (analogy or numerical digit), electric capacity (surface electrical is projected capacitive perhaps), optical profile type (infrared-type or optical image formula), electromagnetic type, surface acoustic wave type, liquid crystal panel are embedded etc.Wherein, resistive touch screen accurate positioning, but its price is quite high, and be afraid of to scrape rapid wear.Surface capacitance touch-screen does not have the mechanism structure of resistance-type, therefore without easily scraping the problem points of damage, but its maximum restriction is difficult to realize be the problem that multi-point touch and signal disturb.Projected capacitive touch screen is then when more large-sized touch-screen, needs more induction electrodes, and relative control wafer also needs more signal passage, therefore, at present still not generally in large scale touch-screen (similarly being televisor).The advantage of infrared touch panel is that transmittance is high, reaction is fast, accuracy is good, but limited resolution is not enough and Cost Problems, is replaced gradually by optical image formula.Surface acoustic wave touch screen solves the various defects of touch-screen in the past, is clearly not easy damaged, is suitable for various occasion, if its shortcoming is screen surface have water droplet and dust that touch-screen can be made to become blunt, even do not work.High and the reaction velocity of electromagnetical type touch screen accuracy is fast, but uses specific time writer, so range of application is relatively restricted due to needs.As mentioned above, in the technical field of touch-screen, every technology has its relative merits, does not have a technology to be all advantages included at present.
Wherein, optical image formula touch-screen is that a kind of optical image technology that utilizes obtains the touch panel device of touch location, grows up in accuracy, reaction velocity, serviceable life, size application aspect is all better than other touch-screens, and with low cost.Optical image formula touch-screen principle of work utilizes light to interdict principle.Wherein respectively there are a camera module and a LED in the left upper right corner of touch-screen, the LED of side is launched Infrared and is reflected through reflecting strips, received by opposite side camera module again, wherein, Infrared forms reticule in touch screen zone, and when touching a bit, the reflection ray of this point is blocked, calculated the coordinate of this point by software, realize touching reaction.Wherein, lens assembly is parts crucial in optical image formula touch-screen, and the present invention improves according to described camera module, makes it optimize.
In addition, at present in the imaging of resolving camera lens, the relatively method of science, via modulation transfer function (MTF, ModulationTransferFunction) resolve, this is a kind of method measuring optical frequency, and it is the line pair can present how many black and white two lines in the scope of a millimeter (mm).That is sinusoidal grating (chequered with black and white grid) is utilized to test.The lines density of sinusoidal grating is also called spatial frequency, and its unit is lp/mm.Further, resolution and the contrast of camera lens is namely resolved.Resolution is every millimeter of demand pairs that can tell is exactly resolution, its unit be line right/millimeter (lp/mm).Namely contrast is contrast, and the most highlighted value with the darkest difference in reflection grating, utilize the method representation contrast of modulation, namely suppose that the maximal value of the illumination of grating is Imax, the minimum value of-illumination is Imin.Therefore:
Contrast=(minimum value of the maximal value-illumination of illumination)/(minimum value of the maximal value+illumination of illumination)
Degree of modulation M=(Imax-Imin)/(Imax+Imin)
Be understandable that, degree of modulation can between 0 and 1.When degree of modulation is larger, contrast is larger, and namely the span of illumination maximal value and illumination minimum value is larger, and when illumination maximal value is equal with illumination minimum value, contrast disappears completely, and its degree of modulation equals 0.
In addition, the degree of modulation of lens imaging is called degree of modulation transport function (MTF, ModulationTransferFunction) with the function of spatial frequency variation.Be the sinusoidal grating of M for original degree of modulation, if the degree of modulation arrived as the picture of plane through camera lens is M ', then MTF functional value is:
Mtf value=M '/M
As can be seen here, mtf value must be greater than 0, is less than 1.Mtf value, more close to 1, illustrates that the performance of camera lens is more excellent.
In addition, it is worth mentioning that, the mtf value measured by the sinusoidal grating of tangential lines and lines is radially different.The MTF curve that the lines being parallel to diameter produce is called sagitta of arc curve, is designated as S, and the MTF curve that the lines being parallel to tangent line produce is called meridian curve, be designated as M or T.
Summary of the invention
An object of the present invention is to provide one for the camera module of optical touch screen, it can be applicable to an optical touch screen device of an electronic equipment, wherein said camera module is when the performance of MTF, present T direction to draw high, the state that S forces down in direction, when described like this camera module is applied on described optical touch screen device, described optical touch screen device has preferably sensitive performance.
Another object of the present invention is to provide one for the camera module of optical touch screen, wherein said camera module can only have a slice eyeglass to form, and its thing side and face, image side are aspheric surface, and it reaches excellent performance by simple structure.
Another object of the present invention is to provide one for the camera module of optical touch screen, its imageing sensor can be CCD (Charge-coupledDevice, charge coupled cell) or be Linear CMOS (ComplementaryMetal-OxideSemiconductor, complementary metal oxide silicon) sensitive chip, there is the advantage of high-performance, low-power consumption, low cost.Especially when described imageing sensor is Linear CMOS sensitive chip, therefore, when contacting described touch screen unit, because described Linear CMOS sensitive chip is very high relative to the requirement in X/Y direction, therefore described optical touch screen device has and preferably responds to usefulness.
Another object of the present invention is to provide one for the camera module of optical touch screen, it can guarantee stability in use and reliability, with improving product yield.
In order to achieve the above object, the invention provides one for the camera module of optical touch screen, it comprises:
One camera lens;
One saturating infrared fileter, passes to allow infrared light; And
One imageing sensor, wherein the light emitting diode of optical touch screen configuration sends infrared light and arrives described camera lens, arrive described imageing sensor further through described optical filter, the described lens design of wherein said camera module become to make its focal distance f meet as shown in the formula:
0.6<f<1.5。
According to one embodiment of present invention, wherein when MTF resolves, spatial frequency is 65lp/mm, and in 35-60 degree field range, the test data of described camera module meets following condition:
MTFS≦0.05;MTFT≧0.3。
According to one embodiment of present invention, wherein when MTF resolves, spatial frequency is 51-65lp/mm, and in 35-60 degree field range, the test data of described camera module meets following condition: MTFT is between 0.4-0.5.
According to one embodiment of present invention, the distance ttl value between the thing side of wherein said camera lens and described imageing sensor is between 2.5-4.
According to one embodiment of present invention, wherein said f value is 0.65,0.70,0.75,0.80,0.85,0.90,0.95,1.00,1.05,1.10,1.15,1.20,1.25,1.30,1.35,1.40 or 1.45.
According to one embodiment of present invention, wherein said f value is between 0.6-0.65, or between 0.65-0.70, or between 0.70-0.75, or between 0.75-0.80, or between 0.80-0.85, or between 0.85-0.90, or between 0.90-0.95, or between 0.95-1.00, or between 1.00-1.05, or between 1.05-1.10, or between 1.10-1.15, or between 1.15-1.20, or between 1.20-1.25, or between 1.25-1.30, or between 1.30-1.35, or between 1.35-1.40, or between 1.40-1.45, or between 1.45-1.5.
According to one embodiment of present invention, wherein said ttl value is 3.289, f value is 1.368.
According to one embodiment of present invention, the thing side of wherein said camera lens and face, image side are all aspheric surface.
According to one embodiment of present invention, focusing lens exempted from by wherein said camera lens, and it is made up of a slice eyeglass.
According to one embodiment of present invention, wherein said eyeglass is that plastic material is made.
According to one embodiment of present invention, the Refractive Index of Material of wherein said camera lens is between 1.45-1.6.
According to one embodiment of present invention, the Refractive Index of Material of wherein said camera lens is 1.544, and the radius-of-curvature of the thing side of described camera lens is-0.787, and the radius-of-curvature in the face, image side of described camera lens is 5.581.
According to one embodiment of present invention, the described camera module for optical touch screen also comprises the diaphragm being arranged at described camera lens front, for controlling or regulating the beam intensity entering described camera lens.
According to a further aspect of the invention, the present invention also provides one for the camera lens of the camera module of optical touch screen, and described lens design becomes to make the focal distance f of described camera module to meet as shown in the formula 0.6<f<1.5
The invention provides one for optical touch screen device, it comprises:
Two optical sensing apparatus, are arranged at the coboundary two ends of described optical touch screen device respectively, for utilizing optical image technology, obtaining described optical touch screen device by relative position during touch-control, wherein optical sensing apparatus described in each, comprising:
One light emitting diode, each described light emitting diode is arranged at the coboundary two ends of a touch screen unit of described optical touch screen device respectively, when described like this light emitting diode launches Infrared, via a reflector element reflection ray of described optical touch screen device, form a reticule in described touch screen unit, wherein said reflector element is arranged at both sides of the edge and the lower limb of described touch screen unit around ground;
One camera module, each described camera module is arranged at the coboundary two ends of the described touch screen unit of described optical touch screen device respectively, for the described light receiving described reticule, and forms an optical imagery; And
One microcontroller, wherein said camera module comprise camera lens and imageing sensor, described camera lens gathers light that described light emitting diode sends and is passed to described imageing sensor, and after carrying out the conversion of photosignal, be sent to the described microcontroller of described optical touch screen device, for the described optical touch screen device of confirmation by relative position during touch-control;
Wherein, described lens design becomes to meet following condition:
0.6<f<1.5
Wherein, when MTF resolves, spatial frequency is 65lp/mm, and is that, in 35-60 field range, test result meets following condition:
MTFS≦0.05
MTFT≧0.3。
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an optical touch screen device according to a preferred embodiment of the present invention.
Fig. 2 is the operation chart of above-mentioned optical touch screen device according to a preferred embodiment of the present invention.
Fig. 3 be a camera module according to a preferred embodiment of the present invention schematic diagram.
Fig. 4 is the MTF curve map of above-mentioned camera module according to a preferred embodiment of the present invention.
Embodiment
Below describe and realize the present invention for disclosing the present invention to enable those skilled in the art.Preferred embodiment in below describing only as an example, it may occur to persons skilled in the art that other apparent modification.The ultimate principle of the present invention defined in the following description can be applied to other embodiments, deformation program, improvement project, equivalent and not deviate from the other technologies scheme of the spirit and scope of the present invention.
As shown in Fig. 1 to Fig. 4, it is a camera module according to a preferred embodiment of the invention, it can be applicable to an optical touch screen device 20 of an electronic equipment, camera module described in it comprises two optical sensing apparatus 10, it is arranged at the coboundary two ends of described optical touch screen device 20 respectively, two ends, left and right as illustrated in the drawing, for utilizing optical image technology, obtain described optical touch screen device by the relative position of touch-control.In addition, described electronic equipment can be mancarried device, similarly is smart mobile phone, or Computer display unit is as desktop computer, notebook, platform computer etc.Described optical touch screen device 20 correspondingly arranges configuration touch-screen for described electronics, can complete intelligent operation to make user by described optical touch screen device 20.
Described optical touch screen device 20 comprises reflector element 21 and a touch screen unit 22, and wherein said reflector element 21 can be arranged at both sides of the edge and the lower limb of described touch screen unit 22 around ground, as shown in figs. 1 and 2.Optical sensing apparatus 10 described in each comprises a camera module 11, with a light emitting diode 12, wherein each described camera module 11 and each described light emitting diode 12, be arranged at the coboundary two ends of the described touch screen unit 22 of described optical touch screen device 20 respectively, as illustrated in the drawing two jiaos, the left and right of coboundary.It is worth mentioning that, in this preferred embodiment of the present invention, described camera module is at MTF (ModulationTransferFunction, modulation transfer function) performance time, present T direction to draw high, the state that S forces down in direction, when described like this camera module is applied on described optical touch screen device 20, described optical touch screen device 20 has preferably sensitive performance.When designing the camera lens of described camera module of the present invention, the performance in described camera module T direction when MTF tests mainly can be paid close attention to.
According to embodiments of the invention, described camera module 11 comprises the saturating infrared fileter 113 of diaphragm 111, camera lens 112, and an imageing sensor 114.Described camera lens 112 is arranged between described diaphragm 111 and described optical filter 113.Before described diaphragm 111 is placed in described camera lens 112, namely described diaphragm 111 is arranged between a glass 221 of described touch screen unit 22 and described camera lens 112, and described like this diaphragm 11 is for controlling or regulating by the light beam of described camera module 11 strong and weak.Described optical filter 113 is arranged between described camera lens 112 and sensor 114, only allows infrared light pass through for guaranteeing.In addition, described camera module 11 comprises an imageing sensor 114, and after it is arranged at described optical filter 113, wherein said optical imagery can be formed in described imageing sensor 114.Such as, when described camera module 11 vertical direction is arranged, described diaphragm 111, described camera lens 112, described infrared fileter 113 and described imageing sensor 114 arrange successively from top to bottom.Certainly it will be appreciated by persons skilled in the art that the arrangement of above-mentioned vertical direction only as an example, in actual applications also may level or arrange obliquely.It is worth mentioning that, described camera module 11, for exempting from focusing lens, produces error for when the difficulty avoiding assembling or regulation and control.In addition, described camera module 11 may be configured with corresponding independently microscope base, for the described camera lens of assembling and other opticses, as described in diaphragm 111, described optical filter 113 and described imageing sensor 114.Or described camera module 12 is directly assemblied in described electronic equipment, namely the inwall of described electronic equipment is used for assembling and locate these opticses of described camera module 11.
When the described light emitting diode 12 of described optical sensing apparatus 10 launches Infrared, reflection ray is formed after reflecting via described reflector element 21, the described camera module 11 of described optical sensing apparatus 10 receives described reflection ray, analyzes described imageing sensor 114 after last reflection ray arrives described camera module 11 for detecting.Be understandable that in a preferred embodiment, such as, each side have a described light emitting diode 12 and a described camera module 11.The infrared light that the described light emitting diode 12 in left side sends, the described camera module 11 on right side is arrived after described reflector element 21 reflects, and the infrared light that the described light emitting diode 12 on right side sends, after described reflector element 21 reflects, arrive the described camera module 11 in left side.Like this, infrared light gauze is formed above described touch screen unit 22, when user puts into finger or other shelters in described infrared light gauze, the processor of described touch panel device 20 or described electronic equipment can calculate touch location according to light information.
It is worth mentioning that, in this preferred embodiment, described imageing sensor 114 is connected to a microcontroller of described optical touch screen device 20, for carrying out required various related operations, certainly in other embodiments, described microcontroller also can be the microprocessor of whole electronic equipment.Particularly, the described infrared ray that described light emitting diode 12 is launched, via described reflector element 21, can form a reticule in described touch screen unit 22.Therefore, when an object contact is to a contact point of described touch screen unit 22, the described reflection ray of the described contact point on described reticule can be interdicted, at this moment the reflection ray that receives of described camera module 11 project described imageing sensor 114, and via a software computing of described microcontroller, the coordinate of described contact point can be judged, and then realize reacting at the associated touch of described touch screen unit.In other words, when a user utilizes touch screen unit 22 described in a touch control component or a finger touch, in the place that described finger or described touch control component contact with described touch screen unit 22, the reflection ray on described reticule can be interdicted, at this moment, when the reflection ray of described reticule is by described camera module 11, an optical imagery can be generated, described optical imagery projecting, described imageing sensor 114 carries out the conversion of electro-optical signal, finally via described microcontroller, go to confirm described touch control component or described finger, touch the relative position of described touch screen unit.
According to embodiments of the invention, described imageing sensor 114 is CCD or is Linear CMOS sensitive chip, and preferred Linear CMOS sensitive chip, it has the advantage of high-performance, low-power consumption, low cost.Therefore, when described camera lens 112 coordinates Linear CMOS sensitive chip, when the described finger of described user or described touch control component contact described touch screen unit 22, because described Linear CMOS sensitive chip is comparatively sensitive relative to the induction in X/Y direction, therefore described optical touch screen device 20 has and preferably responds to usefulness.
According to embodiments of the invention, described camera lens 112 can only have a slice eyeglass to form, and it has thing side 1121 and a face, image side 1122, and wherein said thing side 1121 and face, described image side 1122 are all aspheric surface.It is worth mentioning that, the design of aspherical lens, the light entered through the scope of the centerand edge of minute surface can be allowed to be all the same focal length, that is, the acceptable imaging light range of described eyeglass is comparatively large, and the light entered is more, to increase overall light sensitivity.In other words, when the described thing side 1121 of described camera lens 112 and face, described image side 1122 are aspheric surface, the aberration of described camera module 11 can be reduced, and make described camera lens 112 have more clear, thinner, lighter characteristic.It is worth mentioning that, described camera lens 112 can be that plastic material is made.Especially, the refractive index of its material is between 1.45-1.6, as 1.512, and 1.544,1.558 etc.
According in the present invention, the described thing side 1121 of described camera lens 112 is TTL to the distance of described imageing sensor 114 on optical axis, and the focal length of the lens combination of described camera module 11 is f.Resolve through modulation transfer function (MTF, ModulationTransferFunction), wherein MTFS is the mtf value on sagitta of arc direction, and MTFT is the mtf value on meridian direction.
Described lens assembly 11 camera module 11 in order to there be better usefulness, demand fulfillment following condition formulae:
0.6<f<1.5。Preferably, such as f value can be 0.65,0.70,0.75,0.80,0.85,0.90,0.95,1.00,1.05,1.10,1.15,1.20,1.25,1.30,1.35,1.40,1.45 or other point values within the scope of this.
When resolving through MTF, be 65lp/mm in spatial frequency (or claiming examination frequency), and be in 35-60 field range, described camera module 11 meets following relationship:
MTFS≦0.05
MTFT≧0.3。
The numerical value that it will be understood by those skilled in the art that above-mentioned examination frequency only as an example, is not limited to the present invention, the object of such setting of described camera lens 112 of the present invention be to make its when MTF tests T direction in drawing high state.
In a preferred embodiment of the invention, the detail parameters data of described camera module 11 can be illustrated fully and be disclosed in Table 1, and wherein the ttl value of a preferred embodiment of the present invention is 3.289, f value is 1.368.Thickness unit is millimeter.Material parameter comprises its refractive index and dispersive power.The characteristic on the surface of all parts between the glass on the surface of optical touch screen device 20 shown in table 1 to described imageing sensor 13 (corresponding last column).Wherein in following table 1, signal is the physical property that aspheric adjacent rows refers to described camera lens 112 of the present invention.
Table 1
Surface type Radius-of-curvature Thickness Material Effective diameter Circular cone coefficient
Sphere Infinite 1000 1733.260
Sphere Infinite 0.300 1.523/58.57 1.380
Sphere Infinite 0.500 1.171
Sphere Infinite 0.050 0.270
Aspheric surface 5.581 1.081 1.544/56.11 0.410 -150.004
Aspheric surface -0.787 1.009 0.803 -0.797
Sphere Infinite 0.300 1.523/58.57 1.369
Sphere Infinite 0.050 1.482
Sphere Infinite 0 1.483
It is worth mentioning that, as table 1, the radius-of-curvature of the described thing side 1121 of camera lens 112 described in it is 5.581, and the radius-of-curvature in the face, described image side 1122 of described camera lens 112 is-0.787.
Correspondingly, the setting of the described camera lens 112 of described camera module 11, its f value is 1.368 meet a following condition:
0.6<f<1.5。
Further, as shown in Figure 4, when resolving through MTF, be 51 to 65lp/mm in spatial frequency (or claiming examination frequency), and in 35-60 degree field range, the MTFT of described camera lens 112, between 0.4-0.5, meets following relationship:
MTFS≦0.05
MTFT≧0.3。
When examining frequency to be 42lp/mm, its MTFT direction is drawn high to peak value about about 0.65.
In a further embodiment, ttl value can between 2.5-4, and f value is preferably between 1.2 to 1.4.The refractive index of the eyeglass of described camera lens 112 is preferably between 1.45-1.6, and dispersive power is preferably between 50-60.Be understandable that, the example in the citing of above-mentioned numerical range and chart only as an example, and does not limit the present invention.
One skilled in the art will understand that the embodiments of the invention shown in foregoing description and accompanying drawing only limit the present invention as an example and not.Object of the present invention is complete and effectively realize.Function of the present invention and structural principle are shown in an embodiment and are illustrated, do not deviating under described principle, embodiments of the present invention can have any distortion or amendment.

Claims (19)

1. one for the camera module of optical touch screen, it is characterized in that, comprising:
One camera lens;
One saturating infrared fileter, passes to allow infrared light; And
One imageing sensor, wherein the light emitting diode of optical touch screen configuration sends infrared light and arrives described camera lens, arrive described imageing sensor further through described optical filter, the described lens design of wherein said camera module become to make its focal distance f meet as shown in the formula:
0.6<f<1.5。
2. the camera module for optical touch screen according to claim 2, wherein when MTF resolves, spatial frequency is 65lp/mm, and in 35-60 degree field range, the test data of described camera module meets following condition:
MTFS≦0.05;MTFT≧0.3。
3. the camera module for optical touch screen according to claim 1, wherein when MTF resolves, spatial frequency is 51-65lp/mm, and in 35-60 degree field range, the test data of described camera module meets following condition: MTFT is between 0.4-0.5.
4. the camera module for optical touch screen according to claim 1, the distance ttl value between the thing side of wherein said camera lens and described imageing sensor is between 2.5-4.
5. the camera module for optical touch screen according to claim 1, wherein said f value is 0.65,0.70,0.75,0.80,0.85,0.90,0.95,1.00,1.05,1.10,1.15,1.20,1.25,1.30,1.35,1.40 or 1.45.
6. the camera module for optical touch screen according to claim 1, wherein said f value is between 0.6-0.65, or between 0.65-0.70, or between 0.70-0.75, or between 0.75-0.80, or between 0.80-0.85, or between 0.85-0.90, or between 0.90-0.95, or between 0.95-1.00, or between 1.00-1.05, or between 1.05-1.10, or between 1.10-1.15, or between 1.15-1.20, or between 1.20-1.25, or between 1.25-1.30, or between 1.30-1.35, or between 1.35-1.40, or between 1.40-1.45, or between 1.45-1.5.
7. the camera module for optical touch screen according to claim 4, wherein said ttl value is 3.289, f value is 1.368.
8., according to the described camera module for optical touch screen arbitrary in claim 1 to 7, thing side and the face, image side of wherein said camera lens are all aspheric surface.
9. the camera module for optical touch screen according to claim 8, focusing lens exempted from by wherein said camera lens, and it is made up of a slice eyeglass.
10. the camera module for optical touch screen according to claim 9, wherein said eyeglass is that plastic material is made.
11. according to the described camera module for optical touch screen arbitrary in claim 1 to 7, and the Refractive Index of Material of wherein said camera lens is between 1.45-1.6.
12. camera modules for optical touch screen according to claim 11, the Refractive Index of Material of wherein said camera lens is 1.544, and the radius-of-curvature of the thing side of described camera lens is-0.787, and the radius-of-curvature in the face, image side of described camera lens is 5.581.
13., according to the described camera module for optical touch screen arbitrary in claim 1 to 7, wherein also comprise the diaphragm being arranged at described camera lens front, for controlling or regulating the beam intensity entering described camera lens.
14. 1, for the camera lens of the camera module of optical touch screen, is characterized in that, described lens design becomes to make the focal distance f of described camera module to meet as shown in the formula 0.6<f<1.5.
The camera lens of 15. camera modules for optical touch screen according to claim 14, thing side and the face, image side of wherein said camera lens are all aspheric surface.
The camera lens of 16. camera modules for optical touch screen according to claims 14 or 15, wherein said camera lens is made up of a slice eyeglass.
The camera lens of 17. camera modules for optical touch screen according to claim 16, focusing lens exempted from by wherein said camera lens, and be made up of plastic material.
The camera lens of 18. camera modules for optical touch screen according to claims 14 or 15, the Refractive Index of Material of wherein said camera lens is between 1.45-1.6, and dispersive power is between 50-60, and described f value is between 1.2-1.4.
The camera lens of 19. camera modules for optical touch screen according to claims 14 or 15, wherein when described camera module MTF resolves, spatial frequency is 65lp/mm, and in 35-60 degree field range, the test data of described camera module meets following condition:
MTFS≦0.05;MTFT≧0.3。
CN201510569872.4A 2015-09-09 2015-09-09 Camera module for optical touch screen and lens thereof Pending CN105138193A (en)

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