CN106295488A - Fingerprint sensor cover plate and preparation method thereof, fingerprint sensor module and mobile phone - Google Patents
Fingerprint sensor cover plate and preparation method thereof, fingerprint sensor module and mobile phone Download PDFInfo
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- CN106295488A CN106295488A CN201510359021.7A CN201510359021A CN106295488A CN 106295488 A CN106295488 A CN 106295488A CN 201510359021 A CN201510359021 A CN 201510359021A CN 106295488 A CN106295488 A CN 106295488A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
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Abstract
A kind of fingerprint sensor cover plate and preparation method thereof, fingerprint sensor module and mobile phone.Wherein, the manufacture method of described fingerprint sensor cover plate, including: using multifiber fusion pressure to become prismatic optical fibre rod, the length direction of described optical fiber is identical with the length direction of described prismatic optical fibre rod；Described prismatic optical fibre rod is processed into one or more cylindrical fiber rod, and the length direction of described optical fiber is identical with the length direction of described cylindrical fiber rod；Processing two tabular surfaces being parallel to each other in the side of described cylindrical fiber rod, described flat faces parallel is in the length direction of described optical fiber；The optical fibre rod with described tabular surface is cut, the vertical described tabular surface of facet, obtain fingerprint sensor cover plate.The manufacture method of described fingerprint sensor cover plate can improve the processing technology efficiency of fingerprint sensor cover plate, reduces cost.
Description
Technical field
The present invention relates to optical fingerprint sensor field, particularly relate to a kind of fingerprint sensor cover plate and preparation method thereof, fingerprint sensor module and mobile phone.
Background technology
Fingerprint imaging identification technology is a kind of fingerprint image being gathered human body by fingerprint sensor, then with system in existing fingerprint imaging information compare whether carry out correct judgment, and then realize the technology of identification.Fingerprint imaging identification technology, due to the convenience used and the uniqueness of somatic fingerprint, has been widely used in every field.The such as field of safety check such as public security bureau, customs, the gate control system of building and the consumer product area such as PC and mobile phone etc..
The implementation of fingerprint imaging identification technology has the multiple technologies such as optical finger print imaging, capacitive fingerprint imaging, ultrasonic fingerprint imaging.Comparatively speaking, the imaging effect of optical finger print imaging technique is relatively good, and equipment cost is relatively low, thus is widely applied.
In optical finger print imaging technique, it usually needs be provided above fingerprint sensor cover plate, described fingerprint sensor cover plate at corresponding fingerprint sensor.Owing to a fingerprint sensor cover plate at least surface is exposed to outside, therefore it is required that its intensity is good and scratch-resistant, so the material of existing fingerprint sensor cover plate is generally the material such as sapphire or special cermacis, relatively costly.And the difficulty of processing of these materials is big, the processing mode of existing fingerprint sensor cover plate is usually the mode such as cut, high pressure waterjet, uses monolithic processing, and processing cost is high, and efficiency comparison is low.
Summary of the invention
The problem that the present invention solves is to provide a kind of fingerprint sensor cover plate and preparation method thereof, fingerprint sensor module and mobile phone, to improve the working (machining) efficiency of existing fingerprint sensor cover plate, reduce cost, and reduce fingerprint sensor module and the cost of mobile phone accordingly, improve fingerprint sensor module and the working (machining) efficiency of mobile phone.
For solving the problems referred to above, the present invention provides the manufacture method of a kind of fingerprint sensor cover plate, including:
Using multifiber fusion pressure to become prismatic optical fibre rod, the length direction of described optical fiber is identical with the length direction of described prismatic optical fibre rod；
Described prismatic optical fibre rod is processed into one or more cylindrical fiber rod, and the length direction of described optical fiber is identical with the length direction of described cylindrical fiber rod；
Processing two tabular surfaces being parallel to each other in the side of described cylindrical fiber rod, described flat faces parallel is in the length direction of described optical fiber；
The optical fibre rod with described tabular surface is cut, the vertical described tabular surface of facet, obtain fingerprint sensor cover plate.
Optionally, use the method for multi-wire saw to cut the optical fibre rod with described tabular surface simultaneously, obtain multiple described fingerprint sensor cover plate once to cut.
Optionally, described prismatic optical fibre rod be shaped as four-prism or positive six prisms.
Optionally, described prismatic optical fibre rod is processed into multiple cylindrical fiber rod and includes: described four-prism or positive six prisms are cut into four identical quadrangulars, then described quadrangular are carried out round as a ball, form described cylindrical fiber rod.
Optionally, symmetrical grinding processing method is used to form described tabular surface.
Optionally, also include: the described fingerprint sensor cover plate obtained after multiple cuttings is put in beveler, add grinding sand and water to carry out chamfering.
Optionally, the thickness range of described fingerprint sensor cover plate is 0.1mm～8mm.
For solving the problems referred to above, the present invention provides a kind of fingerprint sensor cover plate:
The plan view shape of described fingerprint sensor cover plate is two identical arch and the combination of a rectangle, described rectangle is between two described arch, the center of circle of described arch overlaps with the centre of form of described rectangle, and first group of opposite side of described rectangle string with two described arch respectively overlaps, and the side that second group of opposite side of described rectangle is corresponding is flat surfaces；
The material of described fingerprint sensor cover plate is optical fiber, and the length direction of described optical fiber is perpendicular to the upper and lower surface of described fingerprint sensor cover plate.
Optionally, the thickness range of described fingerprint sensor cover plate is 0.1mm～8mm.
For solving the problems referred to above, the present invention provides a kind of fingerprint sensor module, including fingerprint sensor cover plate as above.
For solving the problems referred to above, the present invention provides a kind of mobile phone, including upper described fingerprint sensor module.
Compared with prior art, technical scheme has the advantage that
In technical scheme, it is initially formed prismatic optical fibre rod, prismatic optical fibre rod is processed into one or more cylindrical fiber rod again, afterwards, process two tabular surfaces being parallel to each other in the side of described cylindrical fiber rod, and the optical fibre rod with tabular surface is cut, corresponding fingerprint sensor cover plate can be formed, whole course of processing step is simple, and efficiency is high.Meanwhile, optical fiber is used to reduce as material, cost of manufacture.More importantly, in made fingerprint sensor cover plate, there are two tabular surfaces, it is easy to capture, make the assembly difficulty during assembling reduce.Simultaneously as be processed two tabular surfaces being parallel to each other by cylindrical fiber rod after directly cut the shape obtained, therefore, whole fingerprint sensor cover plate remains with the advantage that length of side Area comparison is big, is used in the identification of human finger.In addition, due in manufacturing process, the length direction of optical fiber is identical with the length direction of described prismatic optical fibre rod, understand, make in the fingerprint sensor cover plate obtained, the length direction of optical fiber can be perpendicular to the upper and lower surface of fingerprint sensor cover plate, and the length direction of optical fiber has good light conductive performance, can improve fingerprint recognition performance.
Accompanying drawing explanation
Fig. 1 is existing a kind of mobile phone schematic diagram；
Fig. 2 is existing another kind of mobile phone schematic diagram；
Fig. 3 is the vertical view structure for amplifying schematic diagram of fingerprint sender unit cap plate in mobile phone shown in Fig. 2；
Fig. 4 is existing another kind of mobile phone schematic diagram；
The existing fingerprint sensor cover plate schematic diagram with chamfering rectangular shape of Fig. 5；
Fig. 6 is the multifiber schematic diagram provided in the manufacture method that the embodiment of the present invention is provided；
Fig. 7 is the positive hexagon optical fibre rod bottom elevational view utilizing optical fiber shown in Fig. 6 to be formed；
Fig. 8 is the positive hexagon optical fibre rod schematic perspective view utilizing optical fiber shown in Fig. 6 to be formed；
Fig. 9 is the cylindrical fiber rod schematic perspective view utilizing positive hexagon optical fibre rod shown in Fig. 8 to be formed；
Figure 10 is the optical fibre rod schematic perspective view with tabular surface utilizing cylindrical fiber rod shown in Fig. 9 to become；
Figure 11 is the fingerprint sensor cover plate schematic perspective view utilizing optical fibre rod shown in Figure 10 to obtain after cutting；
Figure 12 is the schematic top plan view of fingerprint sensor cover plate shown in Figure 11；
Figure 13 is the schematic perspective view after fingerprint sensor cover plate shown in Figure 11 carries out chamfering；
Figure 14 is the cross-sectional view of a wherein optical fiber of composition Figure 11 middle finger stricture of vagina sensor cover plate；
Figure 15 is the fingerprint sensor modular structure schematic diagram that the embodiment of the present invention is provided；
Figure 16 is the part-structure schematic diagram of fingerprint sensor module shown in Figure 15；
Figure 17 is the mobile phone schematic diagram that the embodiment of the present invention is provided.
Detailed description of the invention
The fingerprint sensor cover plate of current finger print module typically has circle, the similar shape such as run-track shaped, rectangle and chamfering rectangle, sees Fig. 1 to Fig. 5 respectively.
It is circular fingerprint sensor cover plate 11 that Fig. 1 shows that mobile phone 10, mobile phone 10 have plan view shape.This fingerprint sensor cover plate 11 is less susceptible to capture during assembling, makes assembly difficulty increase, and typically requires and use the material slices such as sapphire to make, and working (machining) efficiency is low.
It is similar run-track shaped fingerprint sensor cover plate 21 that Fig. 2 shows that mobile phone 20, mobile phone 20 have plan view shape.Fig. 3 further illustrates the vertical view structure for amplifying of fingerprint sensor cover plate 21.In the plan view shape of fingerprint sensor cover plate 21, centre is a rectangle, and two semicircles at two ends are connected (in figure, dotted line shows round second half) respectively in the way of tangent with rectangle.In fingerprint sensor cover plate 21, two semi-circular portions in processing plan structure need the longer process time, and the shape of entirety is the most elongated, is unfavorable for the identification of finger print.
Fig. 4 has gone out mobile phone 30, and mobile phone 30 has the fingerprint sensor cover plate 31 that plan view shape is rectangle.This fingerprint sensor cover plate 31 length of side is relatively big, and has obvious four right angles, and feel is poor.
Fig. 5 shows the fingerprint sensor cover plate 41 with chamfering rectangular shape, and fingerprint sensor cover plate 41 can also regard the fingerprint sensor cover plate that another kind of plan view shape is track type as.The manufacturing process of fingerprint sensor cover plate 41, by being that to be first processed into plan view shape be rectangular configuration, carries out rounding process the most again.Owing to needs carry out chamfering to four angles, and chamfered part is relatively big, and therefore difficulty of processing is relatively big, and the process-cycle is longer.
For solving the deficiency of above-mentioned existing fingerprint sensor cover plate, the present invention provides a kind of new fingerprint sensor cover plate, the plan view shape of fingerprint sensor cover plate is two identical arch and the combination of a rectangle, described rectangle is between two described arch, the center of circle of described arch overlaps with the centre of form of described rectangle, and first group of opposite side of described rectangle string with two described arch respectively overlaps, and the side that second group of opposite side of described rectangle is corresponding is tabular surface；The material of described fingerprint sensor cover plate is optical fiber, and the length direction of described optical fiber is perpendicular to the upper and lower surface of described fingerprint sensor cover plate.Owing to the plan view shape of fingerprint sensor cover plate is two identical arch and the combination of a rectangle, and side corresponding to described second group of opposite side of rectangle is flat surfaces, therefore, when assembling, described flat surfaces can be utilized to capture, so that installation process is simpler.And, the center of circle of described arch overlaps with the centre of form of described rectangle, therefore, after whole described fingerprint sensor cover plate can utilize regular cylindrical barred body to process two flattened side being parallel to each other, directly carry out cutting and can be obtained by corresponding shape, simplify processing technology.Meanwhile, the material of described fingerprint sensor cover plate is optical fiber, not only reduces cost, and simplifies processing technique, improves working (machining) efficiency.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in detail.
The embodiment of the present invention provides the manufacture method of a kind of fingerprint sensor cover plate, incorporated by reference to reference to Fig. 6 to Figure 14.
Incorporated by reference to reference to Fig. 6 to Fig. 8, using multifiber fusion pressure to become prismatic optical fibre rod, the length direction of described optical fiber is identical with the length direction of described prismatic optical fibre rod.
Refer to Fig. 6, it is provided that multifiber 111.
Currently manufactured optical fiber mainly has the interior chemical vapor deposition method (CVD) of pipe, the interior CVD of rod, PCVD (Plasma Chemical Vapor Deposition) (PCVD) and axial vapor deposition method (VAD).No matter but use any method, the most at high temperature fibre core will be inserted in fine skin (fibre core and fine skin are referred to Figure 14) and make prefabricated rods (not shown), the most described prefabricated rods is heated softening in high temperature furnace, pulls into long filament by wire-drawing equipment, thus obtains optical fiber.It should be noted that the optical fiber 111 that the present embodiment is used does not includes that plastic sheath, i.e. optical fiber 111 are unencapsulated in plastic sheath.
Refer to Fig. 7 and Fig. 8, multifiber 111 fusion pressure is become positive hexagon optical fibre rod 113.Fig. 7 shows the bottom elevational view of positive hexagon optical fibre rod 113, and Fig. 8 shows the schematic perspective view of positive hexagon optical fibre rod 113.
The concrete manufacturing process of positive six prism optical fibre rods 113 includes the following stated step.
Draw composite filament: choosing multifiber 111 shown in Fig. 6, it is orthohexagonal bar-shaped for being arranged in cross section on the mould designed, and as shown in Figure 6, then they is stopped up, and two ends can be tied up with nonflammable copper cash.By they clampings on wire drawing machine, draw, thus obtain composite filament 112.
It should be noted that, in other embodiments, in the final composite filament 112 prepared, each internal optical fiber 111 can be (through once, twice or three the above drawing process once-combined silk i.e. can to carry out drawing process again and form secondary composite filament, secondary composite filament can also be carried out again drawing process and form three composite filaments), so that each optical fiber 111 within composite filament 112 is decreased to required diameter range, it is to say, internal optical fiber 111 number comprised of every composite filament 112 can be controlled.
It should be noted that the diameter of optical fiber 111 can control about 6 μm～12 μm after final wire drawing, the diameter of this diameter and wire drawing for the first time is relevant, and the diameter of first time wire drawing can be by mould and equipment controls.In turn, ultimately form in fingerprint sensor cover plate the size of required fibre diameter if it is determined that, the diameter of optical fiber 111 when determining wire drawing for the first time can be turned around.
Row's plate: the composite filament 112 being above drawn into is cut into certain length according to the length of fusion pressure mould, then at the radical of the requirement designing and arranging plate every limit composite filament 112 that can meet finished product optical fibre rod size and consideration allowance and fusion pressure amount of contraction.Composite filament 112 is discharged in corresponding mould in order, is spaced a distance and ties up with steel wire.
Fusion pressure: the composite filament 112 sequenced is combined shifting and installs in corresponding fusion pressure mould, and be put in fusion pressure stove.Then according to suitably, program carries out evacuation, design temperature time graph pressurizes, pressing process is by controlling amount of contraction 8%～9%, the combination fusion pressure lined up by composite filament 112 is become the one blank fitted tightly, after having suppressed, carry out cooling and move stove and the demoulding, form positive hexagon optical fibre rod 113.
Refer to Fig. 8, in the present embodiment, the distance (the most orthohexagonal height) on two limits that are parallel to each other, bottom surface of positive hexagon optical fibre rod 113 can be arranged on about 29mm, and the length of positive hexagon optical fibre rod 113 can be about 180mm.
In the present embodiment, positive hexagon optical fibre rod 113 has three sides to being parallel to each other, therefore, the most corresponding fusion pressure forming process.Further, prismatic optical fibre rod 113 compound with regular structure of formation, the technique being conducive to next step.
It should be noted that in other embodiments, it is also possible to multifiber fusion pressure is become the prismatic optical fibre rod of common shape.Such as, the shape of described prismatic optical fibre rod can also be four-prism.Described prismatic optical fibre rod being processed into four-prism and is processed into positive six prisms and has similar advantage, four-prism has two sides to being parallel to each other, therefore, be conducive to corresponding fusion pressure forming process, further, the prismatic optical fiber bar structure of formation is regular, the technique being conducive to next step.In other embodiments, the shape of described prismatic optical fibre rod can also be that other is prismatic, the most positive eight prismatic, positive 12 prismatic etc., it is also possible to be slant edge cylindricality, for example, tiltedly four prism type, oblique hexagon, oblique eight prismatic and oblique 12 prismatic etc..
Incorporated by reference to reference to Fig. 8 and Fig. 9, the hexagon optical fibre rod 113 positive shown in Fig. 8 cross point line along Fig. 8 is cut, every chain-dotted line represents a cutting planes, two cutting planes are each parallel to the length (i.e. two cutting planes are each perpendicular to bottom surface) of positive hexagon optical fibre rod 113, thus obtain four identical quadrangular (not shown).That is, in the present embodiment, described prismatic optical fibre rod is processed into multiple cylindrical fiber rod include: positive hexagon optical fibre rod 113 is cut into four identical described quadrangulars, then carries out round as a ball to described quadrangular, forms cylindrical fiber rod 114 shown in Fig. 9.
In the present embodiment, positive hexagon optical fibre rod 113 is cut into four identical described quadrangulars, to obtain four cylindrical fiber rods 114, improves the utilization rate of positive hexagon optical fibre rod 113.
In the present embodiment, control a diameter of 9mm～11mm of cylindrical fiber rod 114 bottom surfaces, think that following process provides allowance, and reduce the burden of following process simultaneously.The distance on two limits that are parallel to each other, bottom surface of positive hexagon optical fibre rod 113 mentioned above is arranged on about 29mm, it is possible to ensure that four cylindrical fiber rod 114 diameters are 9mm～11mm.And the length of cylindrical fiber rod 114 remains in that about 180mm.In other embodiments, each size of cylindrical fiber rod 114 can also be adjusted according to the actual requirements.
It should be noted that in other embodiments, it is also possible to other shapes of described prismatic optical fibre rod is processed into one or more cylindrical fiber rod 114, and the length direction of optical fiber 111 still keeps identical with the length direction of cylindrical fiber rod 114.
Refer to Figure 10, two tabular surfaces being parallel to each other are processed in the side of described cylindrical fiber rod 114, being respectively tabular surface 1151 and tabular surface 1152, tabular surface 1151 and tabular surface 1152 are parallel to the length direction of optical fiber 111, and now cylindrical fiber rod 114 is processed to optical fibre rod 115.
In the present embodiment, symmetrical grinding processing method can be used to form tabular surface 1151 and tabular surface 1152.Concrete, the pole both sides that basal diameter is 9mm～11mm obtained are carried out symmetrical grinding, is worked into tabular surface 1151 and tabular surface 1152 reaches the width requirement that needs, after the specific size of described width, extended meeting is chosen further.And the length of a length of cylindrical fiber rod 114 of tabular surface 1151 and tabular surface 1152, it is about 180mm, this that is the length of optical fibre rod 115.
Incorporated by reference to reference to figures 10 to Figure 12, the optical fibre rod 115 in Figure 10 with tabular surface 1151 and tabular surface 1152 is cut, the vertical described tabular surface of facet (not shown), thus obtain the fingerprint sensor cover plate 100 shown in Figure 11 and Figure 12.Wherein, Figure 11 shows the schematic perspective view of fingerprint sensor cover plate 100, and Figure 12 shows the schematic top plan view of fingerprint sensor cover plate 100.
In the present embodiment, the method for multi-wire saw can be used to cut the optical fibre rod 115 shown in Figure 10 with tabular surface 1151 and tabular surface 1152 simultaneously, obtain multiple fingerprint sensor cover plate 100 once to cut.Fingerprint sensor cover plate has thickness T, as shown in figure 11.The thickness T of fingerprint sensor cover plate 100 is required design thickness, it is also possible to bigger than design thickness, thinks the pre-made allowance of follow-up grinding.
Concrete, the thickness T magnitude range of fingerprint sensor cover plate 100 is 0.1mm～8mm.On the one hand, in view of processability, what the present embodiment was provided is needed to be arranged on more than 0.1mm by the fingerprint sensor cover sheet thickness T of optical fiber fabrication, if thickness T is less than 0.1mm, then fingerprint sensor cover plate is being easily broken, even and other material such as existing sapphire or special cermacis also has similar problem；On the other hand, increase thickness and contribute to increasing the intensity of fingerprint sensor cover plate 100, but the mobile phone thickness being generally used for assembling fingerprint sensor cover plate 100 is about 8mm～9mm, therefore, control the thickness T of fingerprint sensor cover plate 100 at below 8mm.
It should be noted that, existing use sapphire or special cermacis are substantially used on capacitive fingerprint sensing device as the fingerprint sensor cover plate of material, in order to ensure that electric capacity is bigger, the existing fingerprint sensor cover plate being used on capacitive fingerprint sensing device typically at about 0.25mm, usual thickness not over 0.3mm.And the existing fingerprint sensor cover sheet thickness being used on optical fingerprint sensor is typically not more than 0.3mm, since it is desired that ensure preferable fingerprint image.The fingerprint sensor cover sheet thickness used due to existing fingerprint sensor is generally not over 0.3mm, and it is typically larger than 0.3mm for assembling the mobile phone front shroud thickness of fingerprint sensor cover plate, therefore, after existing mobile phone assembling fingerprint recognition module, usual fingerprint sender unit cap plate can present the part that depression is gone down in the rigging position of mobile phone front shroud.
But, in the present embodiment, by the fingerprint sensor cover plate 100 using fiber optic materials to make, it is possible to the thickness breaking through 0.3mm limits.This is because, the material of existing fingerprint sensor cover plate is usually the material such as sapphire or special cermacis cover plate, and these materials all can have more serious light loss, it is impossible to that does is the thickest.And this enforcement uses fibre optic plate material to there are not these problems, the comparison that can be done by fingerprint sensor cover plate is thick.Specifically can be fabricated between 0.3mm to 8mm.Such as thickness T shown in Figure 11 can be controlled at 0.4mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm, 4.5mm, 5.0mm, 6.5mm, 7.0mm or 8.0mm etc..It is thicker that fingerprint sensor cover plate 100 can do, then himself intensity can improve.And more importantly, fingerprint sensor cover plate 100 can thicken to identical with the thickness of mobile phone front shroud, such that it is able to accomplish to make fingerprint recognition module and mobile phone front shroud smooth, do not have female.Simultaneously as optical fiber can have good optical property, therefore, even if the thickness T of fingerprint sensor cover plate reaches 8mm, remain able to effectively carry out optical finger print identification.
Incorporated by reference to reference to Figure 11 and Figure 12, the plan view shape of fingerprint sensor cover plate 100 is two identical arch 1007 and the combination of a rectangle 1008, rectangle 1008 is between two arch 1007, the center of circle of arch 1007 overlaps as some O with the centre of form of rectangle 1008, and first group of opposite side of rectangle 1008 string with two arch 1007 respectively overlaps (as shown in broken lines, do not mark), 1,008 second groups of sides that opposite side is corresponding of rectangle be flat surfaces (flat surfaces be in Figure 10 tabular surface 1151 and tabular surface 1152 cutting after corresponding part), second group of opposite side has length L.
Incorporated by reference to reference to Figure 11 and Figure 12, whole fingerprint sensor cover plate 100 has six surfaces, respectively upper surface 1001, lower surface 1002, front flat surfaces 1003, rear flat surfaces 1004 (i.e. flat surfaces includes front flat surfaces 1003 and rear flat surfaces 1004), left side curved surface 1005 and right side curved surface 1006 (left side curved surface 1005 and right side curved surface 1006 are referred to as curved sides surface).
Due to front flat surfaces 1003 and the existence of rear flat surfaces 1004, fingerprint sensor cover plate 100 can be made to be prone to capture, so that fingerprint sensor cover plate 100 is easily assembled, and two identical arch 1007 contribute to the increase fingerprint sensor cover plate 100 area for fingerprint recognition, simultaneously, use fiber optic materials to make the fingerprint recognition performance that can improve fingerprint sensor cover plate 100, and improve process efficiency, cost-effective.
In the present embodiment, the radius of the circle corresponding to arch 1007 is the radius R of the circle of fingerprint sensor cover plate 100 correspondence.The size of radius R controls in 4.5mm～5.5mm (for the half of cylindrical fiber rod 114 basal diameter).
In the present embodiment, as it was previously stated, the basal diameter of the cylindrical fiber rod 114 produced is 9mm～11mm, therefore, in Figure 12, radius R can should determine that mutually.And the length L length of 1,008 second groups of opposite side of rectangle (length L be), become a key element in design.Length L designs generally according to the resolution of fingerprint recognition module, and the resolution of fingerprint recognition module is determined by number of pixels.
In the present embodiment, when fingerprint recognition module has in 80 row and during the pixel of 200 row arrangements, and resolution now is 80 × 200, the most single pixel is when being 50 μm square in the length of side, the most whole pixel region width is 80 × 0.05=4mm, and length is 200 × 0.05=10mm.At this moment, it will usually following two designs:
The first, the diameter (twice of radius R in described a diameter of Figure 12) that design fingerprint sensor cover plate is corresponding is equal to the length of pixel region (in i.e. using the length of pixel region as the square of the length of side, the circle of radius R is just its inscribed circle), the most now radius R is 5.0mm, now, described rectangle 1008 shorter edge is set and controls as 4mm～4.4mm (more than or equal to whole pixel region width), the most now, can be calculated according to mathematical relationship, length L is 8.98mm～9.17mm.But in this design, just have small part at the pixel in four corners of pixel region and take less than.
The second, the circumscribed circle that circle is whole pixel region that design fingerprint sensor cover plate is corresponding, now, calculating the circular diameter understanding fingerprint sensor cover plate corresponding is 10.77mm.Corresponding, the most described rectangle 1008 shorter edge controls to be 4mm～4.4mm, and can be calculated according to mathematical relationship, length L is 9.83mm～10mm.
Refer to Figure 13, described manufacture method also includes: put in beveler by the fingerprint sensor cover plate 100 obtained after multiple cuttings, adds grinding sand with water to carry out chamfering, forms fingerprint sensor cover plate 100a.
Concrete, multi-slice fingerprint sensor cover plate 100 is put into beveler, adds grinding sand and water, by the grains of sand and the collision of product, corner sharp for fingerprint sensor cover plate perimeter is removed, arrives the purpose of chamfering, form the fingerprint sensor cover plate 100a that curved sides surface seamlessly transits with flat surfaces.
Refer to Figure 14, it is shown that the cross-section structure of a wherein optical fiber of composition fingerprint sensor cover plate 100 (may also mean that stricture of vagina sensor cover plate 100a).Optical fiber includes that fibre core 1111 and fine skin 1112, fibre core 1111 are generally made by the optical material that refractive index is different with fine skin 1112, and the refractive index of fine skin 1112 is big
In fibre core 1111.Thus ensure when light is propagated in fibre core 1111, except directly in fibre core 1111 straightline propagation, other the many light of the biggest number can utilize total reflection to propagate before fibre core 1111 infolding back, the light that i.e. overwhelming majority is incident in the range of at a certain angle, the other end can be traveled to from one end along optical fiber, and do not lose, as shown in figure 14.When the present embodiment uses optical fiber as the material of fingerprint sensor cover plate, the special characteristics propagated light due to optical fiber, can drop the loss of low light reflectivity, thus improve the performance of respective optical formula fingerprint sensor.
During the above-mentioned manufacture method of the present embodiment: the length direction of described optical fiber 111 is identical with the length direction of described prismatic optical fibre rod, and the length direction of described optical fiber 111 is identical with the length direction of described cylindrical fiber rod 114, described tabular surface (refer to Figure 10) is parallel to the length direction of described optical fiber, when the optical fibre rod with described tabular surface is cut, the vertical described tabular surface of facet, therefore, the length direction of final optical fiber can be perpendicular to upper surface 1001 and the lower surface 1002 of fingerprint sensor cover plate.
In the manufacture method that the present embodiment is provided, when after up to a million optical fiber permutation and combination of employing, fusion pressure becomes a barred body, i.e. obtain prism-shaped optical fibre rod, then carry out machining for this prism-shaped barred body, form cylindrical fiber rod 114, then cylindrical fiber rod 114 is carried out symmetrical grinding, form the special shape with the tabular surface that is parallel to each other, again by cutting, obtain corresponding fingerprint sensor cover plate, thus improve production efficiency.And can once carry out multi-wire saw and obtain multiple fingerprint sensor cover plate, improve production efficiency further.Additionally, due in described fingerprint sensor cover plate, be well-regulated cylindrical fiber rod 114 processing, therefore, the course of processing is easily controlled and size is easily accurate, reduces technology difficulty simultaneously.The fingerprint sensor cover plate obtained made by additionally, has flat surfaces, it is easy to capture, convenient for assembly.
Another embodiment of the present invention also provides for a kind of fingerprint sensor cover plate, the manufacture method that described fingerprint sensor cover plate is provided by previous embodiment is formed, therefore, the content of described fingerprint sensor cover plate is referred to previous embodiment corresponding contents, and combines with reference to figures 11 to Figure 14.
Concrete, incorporated by reference to reference to Figure 11 and Figure 12, the plan view shape of fingerprint sensor cover plate 100 is two identical arch 1007 and the combination of a rectangle 1008, rectangle 1008 is between two arch 1007, the center of circle of arch 1007 overlaps as some O with the centre of form of rectangle 1008, and first group of opposite side of rectangle 1008 string with two arch 1007 respectively overlaps, and 1,008 second groups of sides that opposite side is corresponding of rectangle are flat surfaces.Whole fingerprint sensor cover plate 100 has six surfaces, respectively upper surface 1001, lower surface 1002, front flat surfaces 1003, rear flat surfaces 1004, left side curved surface 1005 and right side curved surface 1006.More contents refer to previous embodiment corresponding contents.
Due to front flat surfaces 1003 and the existence of rear flat surfaces 1004, fingerprint sensor cover plate 100 can be made to be prone to capture, so that fingerprint sensor cover plate 100 is easily assembled, and two identical arch 1007 contribute to the increase fingerprint sensor cover plate 100 area for fingerprint recognition, simultaneously, use fiber optic materials to make the fingerprint recognition performance that can improve fingerprint sensor cover plate 100, and improve process efficiency, cost-effective.
In the present embodiment, the radius of the circle corresponding to arch 1007 is the radius R of the circle of fingerprint sensor cover plate 100 correspondence.The size of radius R controls in 4.5mm～5.5mm (for the half of cylindrical fiber rod 114 basal diameter).And length L can be 8.98mm～9.17mm, or being 9.83mm～10mm, its reason is referred to previous embodiment corresponding contents.The thickness T magnitude range of fingerprint sensor cover plate 100 can be 0.1mm～8mm, and its reason is referred to previous embodiment corresponding contents.
In the present embodiment, fingerprint sensor cover plate 100 is formed by optical fiber fabrication, and the length direction of optical fiber can be perpendicular to upper surface 1001 and the lower surface 1002 of fingerprint sensor cover plate.This fingerprint sensor cover plate 100 has good in optical property, intensity high (owing to can be fabricated to larger thickness, therefore intensity is high) and the advantage of low cost.
The embodiment of the present invention also provides for a kind of fingerprint sensor module, including fingerprint sensor cover plate 100 as above, incorporated by reference to reference to Figure 15 and Figure 16.Figure 15 shows the structure of fingerprint sensor module, the parts such as including fingerprint sensor cover plate 100, fingerprint sensor 204, light guide plate 206, light source 205, chip (IC) 203, flexible printed circuit board (FPC) 207, upper containment vessel 201 and lower containment vessel 202.Wherein, light source 205 can be LED.
Figure 16 is amplified display to the part-structure shown in Figure 15, the operation principle of fingerprint sensor module can be described in conjunction with Figure 16: the light that light source 205 sends is after light guide plate 206, it is converted to uniform incident illumination (light is in area source mutually), incident illumination (mark) is through fingerprint sensor 204, after fingerprint sensor cover plate 100, arrive finger 300, reflection light (mark) is become after finger 300 surface is reflected, reflection light is after fingerprint sensor cover plate 100, return to fingerprint sensor 204 surface, and accepted by the photo-sensitive cell (not shown) of fingerprint sensor 204.Uneven due to finger 300 fingerprint, the most different through its intensity of reflected light reflected.Reflected light information is passed through flexible printed circuit board 207 output after chip 203 (refer to Figure 15) processes and is arrived imaging after the such as system such as mobile phone or computer.
It should be noted that in other embodiments, fingerprint sensor module can also be to comprise the fingerprint sensor cover plate 100a that previous embodiment is provided.
In the fingerprint sensor module that the present embodiment is provided, owing to having fingerprint sensor cover plate 100, therefore, the optical identification performance of fingerprint sensor module can be improved, and reduce the assembly difficulty of fingerprint sensor module, reduce the processing technology difficulty of fingerprint sensor module, simultaneously, improve the process efficiency of fingerprint sensor module, reduce the cost of fingerprint sensor module.
Another embodiment of the present invention additionally provides a kind of mobile phone 400, and mobile phone 400 includes the fingerprint sensor module that example performed as described above is provided, and wherein, fingerprint sensor module includes the fingerprint sensor cover plate 100 that previous embodiment is provided.It should be noted that in other embodiments, mobile phone 400 can also be to comprise the fingerprint sensor cover plate 100a that previous embodiment is provided.
In the mobile phone 400 that the present embodiment is provided, owing to having the fingerprint sensor module that previous embodiment is provided, and fingerprint sensor module has fingerprint sensor cover plate 100.Therefore, can fingerprint sensor cover plate 100 to improve the optical identification performance of fingerprint sensor module in mobile phone, and reduce the assembly difficulty of mobile phone, reduce the processing technology difficulty of fingerprint sensor module in mobile phone, meanwhile, improve process efficiency, reduce the cost of mobile phone.
Although present disclosure is as above, but the present invention is not limited to this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (12)
1. the manufacture method of a fingerprint sensor cover plate, it is characterised in that including:
Using multifiber fusion pressure to become prismatic optical fibre rod, the length direction of described optical fiber is identical with the length direction of described prismatic optical fibre rod；
Described prismatic optical fibre rod is processed into one or more cylindrical fiber rod, and the length direction of described optical fiber is identical with the length direction of described cylindrical fiber rod；
Processing two tabular surfaces being parallel to each other in the side of described cylindrical fiber rod, described flat faces parallel is in the length direction of described optical fiber；
The optical fibre rod with described tabular surface is cut, the vertical described tabular surface of facet, obtain fingerprint sensor cover plate.
2. the manufacture method of fingerprint sensor cover plate as claimed in claim 1, it is characterised in that use the method for multi-wire saw to cut the optical fibre rod with described tabular surface simultaneously, obtain multiple described fingerprint sensor cover plate once to cut.
3. the manufacture method of fingerprint sensor cover plate as claimed in claim 1, it is characterised in that described prismatic optical fibre rod be shaped as four-prism or positive six prisms.
4. the manufacture method of fingerprint sensor cover plate as claimed in claim 3, it is characterized in that, described prismatic optical fibre rod is processed into multiple cylindrical fiber rod include: described four-prism or positive six prisms are cut into four identical quadrangulars, then described quadrangular is carried out round as a ball, form described cylindrical fiber rod.
5. the manufacture method of fingerprint sensor cover plate as claimed in claim 1, it is characterised in that use symmetrical grinding processing method to form described tabular surface.
6. the manufacture method of fingerprint sensor cover plate as claimed in claim 1, it is characterised in that also include: put in beveler by the described fingerprint sensor cover plate obtained after multiple cuttings, adds grinding sand and water to carry out chamfering.
7. the manufacture method of fingerprint sensor cover plate as claimed in claim 1, it is characterised in that the thickness range of described fingerprint sensor cover plate is 0.1mm～8mm.
8. a fingerprint sensor cover plate, it is characterised in that:
The plan view shape of described fingerprint sensor cover plate is two identical arch and the combination of a rectangle, described rectangle is between two described arch, the center of circle of described arch overlaps with the centre of form of described rectangle, and first group of opposite side of described rectangle string with two described arch respectively overlaps, and the side that second group of opposite side of described rectangle is corresponding is flat surfaces.
9. fingerprint sensor cover plate as claimed in claim 8, it is characterised in that the material of described fingerprint sensor cover plate is optical fiber, and the length direction of described optical fiber is perpendicular to the upper and lower surface of described fingerprint sensor cover plate.
10. fingerprint sensor cover plate as claimed in claim 8, it is characterised in that the thickness range of described fingerprint sensor cover plate is 0.1mm～8mm.
11. 1 kinds of fingerprint sensor modules, it is characterised in that include the fingerprint sensor cover plate as described in claim 8 to 10 any one.
12. 1 kinds of mobile phones, it is characterised in that include fingerprint sensor module as claimed in claim 11.
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| CN201510359021.7A CN106295488B (en) | 2015-06-25 | 2015-06-25 | Fingerprint sensor cover plate, manufacturing method thereof, fingerprint sensor module and mobile phone |
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| CN106295488B (en) | 2023-08-01 |
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