CN215814198U - Fingerprint imaging module and electronic equipment - Google Patents
Fingerprint imaging module and electronic equipment Download PDFInfo
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- CN215814198U CN215814198U CN202120972859.4U CN202120972859U CN215814198U CN 215814198 U CN215814198 U CN 215814198U CN 202120972859 U CN202120972859 U CN 202120972859U CN 215814198 U CN215814198 U CN 215814198U
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Abstract
The utility model provides a fingerprint imaging module and electronic equipment, the fingerprint imaging module includes: a point light source assembly for generating incident light; a sensing assembly having a photosurface; a first contact surface for inputting first fingerprint information; the plane of the light sensing surface of the sensing assembly and the plane of the first contact surface form a preset included angle; incident light generated by the point light source assembly is reflected on the first contact surface and then received by the photosensitive surface of the sensing assembly to obtain a fingerprint image. Compared with the scheme that the photosensitive surface and the first contact surface are parallel to each other, the technical scheme of the utility model can obtain a fingerprint image with a larger area by using the sensing assembly with a smaller area, and is beneficial to increasing the fingerprint acquisition area and/or providing the fingerprint image definition.
Description
Technical Field
The utility model relates to the field of fingerprint imaging, in particular to a fingerprint imaging module and electronic equipment.
Background
The fingerprint identification is to compare the fingerprint image with the existing fingerprint information in the fingerprint identification system after the human fingerprint image is collected, so as to realize the identity identification. Due to convenience of use and uniqueness of human fingerprints, fingerprint identification technology has been widely used in various fields, such as police, customs, personal computers, and the like.
In the existing fingerprint identification method, a human body fingerprint image is mostly collected through an optical sensor. Specifically, the light source can generate incident light, when the incident light is projected to the surface layer of the finger, reflected light with fingerprint information can be formed through reflection of the finger, and the reflected light is received by the optical sensor to obtain a fingerprint image.
However, the fingerprint image that current fingerprint imaging module obtained, or the fingerprint acquisition area is less, or fingerprint image definition is relatively poor, is difficult to satisfy user's demand betterly.
SUMMERY OF THE UTILITY MODEL
The problems solved by the utility model are as follows: the fingerprint acquisition area is increased or the fingerprint image definition is improved.
In order to solve the above problems, the present invention provides a fingerprint imaging module, comprising:
a point light source assembly for generating incident light; a sensing assembly having a photosurface; a first contact surface for inputting first fingerprint information; the plane of the light sensing surface of the sensing assembly and the plane of the first contact surface form a preset included angle; incident light generated by the point light source assembly is reflected on the first contact surface and then received by the photosensitive surface of the sensing assembly to obtain a fingerprint image.
Optionally, the method further includes: the light-transmitting cover plate is positioned on one side of the sensing assembly, and the surface of the light-transmitting cover plate, which is back to the sensing assembly, is the first contact surface.
Optionally, the method further includes: and the supporting component is filled between the sensing assembly and the light-transmitting cover plate.
Optionally, the refractive index of the supporting member is equal to or close to that of the light-transmitting cover plate.
Optionally, the material of the supporting member is optical cement.
Optionally, the light-transmitting cover plate or the supporting part has a preset inclined surface, the point light source assembly is located on the inclined surface, and incident light generated by the point light source assembly is incident on the light-transmitting cover plate through the inclined surface.
Optionally, the method further includes: the right-angle prism comprises two mutually orthogonal right-angle side surfaces and an oblique side surface positioned between the two right-angle side surfaces; the photosensitive surface of the sensing assembly faces to one right-angle side surface of the right-angle prism; the other right-angle side surface of the right-angle prism is the first contact surface, and incident light generated by the point light source assembly enters the right-angle prism from the oblique side surface of the right-angle prism, is reflected on the first contact surface, and then is projected to the right-angle side surface towards which the photosensitive surface faces.
Optionally, far-field light is transmitted through the oblique side surface and the first contact surface in sequence.
Optionally, after the incident light generated by the point light source assembly is reflected on the first contact surface, the incident light is reflected again on the inclined side surface, and then is projected to the right-angle side surface where the light sensing surface faces.
Optionally, the method further includes: the second contact surface is used for inputting second fingerprint information, and the second contact surface is arranged opposite to the first contact surface; the sensing assembly is positioned between the second contact surface and the first contact surface, and the plane of the photosensitive surface is intersected with the plane of the first contact surface and the plane of the second contact surface; the point light source assembly is positioned between the first contact surface and the second contact surface and is opposite to the sensing assembly; incident light generated by the point light source component is reflected on the first contact surface and the second contact surface respectively and then received by the light sensing surface of the sensing component.
Optionally, the method further includes: the waveguide component is provided with a first surface, a second surface, a first side surface and a second side surface, wherein the first surface and the second surface are opposite, and the first side surface and the second side surface are positioned between the first surface and the second surface and are opposite; the first surface is the first contact surface; the second surface is the second contact surface; the point light source assembly is located on the first side face, incident light generated by the point light source assembly is incident to the waveguide component through the first side face, and a light sensing face of the sensing assembly faces the second side face.
Optionally, the method further includes: the right-angle prism comprises two mutually orthogonal right-angle side surfaces and an oblique side surface positioned between the two right-angle side surfaces; the photosensitive surface of the sensing assembly faces to one right-angle side surface of the right-angle prism; the oblique side surface of the right-angle prism is the first contact surface, and incident light generated by the point light source assembly enters the right-angle prism from the other right-angle side surface of the right-angle prism, is reflected on the first contact surface, and then is projected to the right-angle side surface towards which the photosensitive surface faces.
Optionally, the point light source assembly includes 2 point light sources, and the 2 point light sources are located in a perpendicular plane of an intersection line of a plane where the photosensitive surface is located and a plane where the first contact surface is located, and are distributed on two sides of the sensing assembly.
Optionally, the magnification of the position point X on the fingerprint image is
Wherein g does the sensitization face with minimum distance between the first contact surface, alpha does sensitization face place plane with the planar contained angle in first contact surface place, d point light source subassembly with distance between the first contact surface, X do distance between position point X and the origin line O, wherein origin line O does the sensitization face with minimum distance's line between the first contact surface.
Optionally, a plane of the photosensitive surface is orthogonal to a plane of the first contact surface.
Optionally, the sensing assembly is in contact with the light-transmitting cover plate, and the surface of the light-transmitting cover plate in contact with the sensing assembly and the first contact surface form the preset included angle.
Correspondingly, the utility model also provides an electronic device, comprising: the utility model discloses a fingerprint imaging module.
Optionally, the lock comprises a mobile phone, a computer, a vehicle-mounted electronic device, a control device of an instrument or a meter, or an electronic lock.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
in the technical scheme of the utility model, a preset included angle is formed between the plane of the photosensitive surface of the sensing assembly and the plane of the first contact surface, and incident light generated by the point light source assembly is reflected on the first contact surface and then received by the photosensitive surface of the sensing assembly to obtain a fingerprint image. The amplification rate of the fingerprint information is influenced by the size of the preset included angle between the plane of the photosensitive surface and the plane of the first contact surface, and the amplification rate of the fingerprint information is related to the definition of the fingerprint acquisition surface and the definition of the fingerprint image. Compared with the scheme that the photosensitive surface and the first contact surface are parallel to each other, the technical scheme of the utility model can obtain a fingerprint image with a larger area by using the sensing assembly with a smaller area, and is beneficial to increasing the fingerprint acquisition area and/or providing the fingerprint image definition.
Drawings
FIG. 1 is a schematic diagram of a fingerprint imaging module;
FIG. 2 is a schematic structural diagram of another fingerprint imaging module;
FIG. 3 is a schematic cross-sectional view of a fingerprint imaging module according to a first embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a fingerprint imaging module according to a second embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a fingerprint imaging module according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of the optical path of the far-field light in the fingerprint imaging module of fig. 5 according to the present invention.
FIG. 7 is a schematic cross-sectional view of a fingerprint imaging module according to a fourth embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of a fingerprint imaging module according to a fifth embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a fingerprint imaging module according to a sixth embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of a fingerprint imaging module according to a seventh embodiment of the present invention
FIG. 11 is a schematic cross-sectional view of a fingerprint imaging module according to an eighth embodiment of the present invention;
fig. 12 is a schematic cross-sectional view of a fingerprint imaging module according to a ninth embodiment of the utility model.
Detailed Description
Known by the background art, there is the less or the relatively poor problem of fingerprint image definition in fingerprint collection area in the fingerprint imaging module among the prior art.
Referring to fig. 1, a schematic structural diagram of a fingerprint imaging module is shown.
Fingerprint formation of image module includes: a point light source assembly 14 for generating incident light; a sensing assembly 12 having a photosurface 15; a contact surface 13 for inputting fingerprint information. Wherein the contact surface 13 is the surface of the light-transmitting cover plate 11 facing away from the sensing component 12.
After the incident light generated by the point light source assembly 14 transmits through the transparent cover plate 11, the incident light is projected onto the contact surface 13, and is modulated and reflected by the fingerprint information at the contact surface 13; the resulting reflected light is received by the photosensitive surface 15 of the sensing assembly to obtain a fingerprint image.
The distance between the point light source assembly 14 and the contact surface 13 is d, and the distance between the photosensitive surface 15 and the contact surface 13 is g. Specifically, when the photosensitive surface 15 faces the light-transmitting cover plate 11, the distance g between the photosensitive surface 15 and the contact surface 13 is approximately equal to the thickness of the light-transmitting cover plate 11.
Referring to fig. 2 in combination, a schematic structural diagram of another fingerprint imaging module is shown.
The difference between the fingerprint imaging module shown in fig. 2 and the fingerprint imaging module shown in fig. 1 is that a distance d between the point light source assembly 24 and the contact surface 23 is greater than a distance g between the photosensitive surface 25 and the contact surface 23.
In the fingerprint imaging module shown in fig. 1 and 2, the photosensitive surface 15/25 and the contact surface 13/23 are parallel to each other, so that the fingerprint image obtained by the sensor assembly 12/22 has no deformation, and the magnification at any position on the photosensitive surface 15/25 is calculated as (g + d)/d.
In the fingerprint imaging module shown in fig. 1, the point light source assembly 14 is located between the photosensitive surface 15 and the contact surface 13, that is, when d is smaller than g, the magnification at any position on the photosensitive surface 15 is within a range greater than 2; in the fingerprint imaging module shown in fig. 2, the point light source assembly 24 is located on a side of the photosensitive surface 25 away from the contact surface 23, that is, when d is greater than g, the magnification at any position on the photosensitive surface 15 is in a range greater than 1 and less than 2; when the point light source assembly is located on the plane of the light-sensing surface, namely d is equal to g, the magnification at any position on the light-sensing surface is equal to 2.
Therefore, the amplification ratio of the fingerprint image relative to the original fingerprint information is related to the relative positions of the point light source, the contact surface of the fingerprint and the light-transmitting cover plate and the light-sensitive surface of the sensing assembly, and therefore the amplification ratio of the fingerprint image relative to the original input fingerprint information can be adjusted by changing the position relationship of the point light source, the contact surface of the fingerprint and the light-transmitting cover plate and the light-sensitive surface of the sensing assembly.
In order to solve the technical problem, the present invention provides another fingerprint imaging module, including: a point light source assembly for generating incident light; a sensing assembly having a photosurface; a first contact surface for inputting first fingerprint information; the plane of the light sensing surface of the sensing assembly and the plane of the first contact surface form a preset included angle; incident light generated by the point light source assembly is reflected on the first contact surface and then received by the photosensitive surface of the sensing assembly to obtain a fingerprint image.
The amplification rate of the fingerprint information is influenced by the size of the preset included angle between the plane of the photosensitive surface and the plane of the first contact surface, and the amplification rate of the fingerprint information is related to the fingerprint acquisition area and the definition of a fingerprint image. Compared with the scheme that the photosensitive surface and the first contact surface are parallel to each other, the technical scheme of the utility model can obtain a fingerprint image with a larger area by using the sensing assembly with a smaller area, and is beneficial to increasing the fingerprint acquisition area and/or providing the fingerprint image definition.
Since the required sensor area will be reduced when the fingerprint image magnification is small. The photosensitive surface of the prior fingerprint identification device is parallel to the first contact surface used for inputting fingerprint information, namely the amplification rate of each point fingerprint image on the first contact surface is the same and is generally about 2 times. When the photosensitive surface and the first contact surface form an included angle, the amplification rate of the fingerprint image acquired by the sensor is gradually changed, and the amplification rate of some parts is less than 2 times, so that the area of the sensor required for acquiring the fingerprint information with the same area is reduced on the whole, and on the other hand, if the sensor with the same area is adopted, more fingerprint information can be borne.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 3, a schematic cross-sectional structure diagram of a fingerprint imaging module according to an embodiment of the utility model is shown.
Fingerprint formation of image module includes: a point light source assembly 110, the point light source assembly 110 for generating incident light; a sensing component 120, the sensing component 120 having a photosensitive surface 121; a first contact surface 130, the first contact surface 130 being used for inputting first fingerprint information; a preset included angle is formed between the plane of the photosensitive surface 121 of the sensing component 120 and the plane of the first contact surface 130; the incident light generated by the point light source assembly 110 is reflected by the first contact surface 130 and then received by the photosensitive surface 121 of the sensing assembly 120 to obtain a fingerprint image.
The amplification rate of the fingerprint information is affected by the size of the preset included angle between the plane of the photosensitive surface 121 and the plane of the first contact surface 130, and the amplification rate of the fingerprint information is related to the fingerprint acquisition area and the definition of the fingerprint image. Compared with the scheme that the photosensitive surface and the first contact surface are parallel to each other, the technical scheme of the utility model can obtain a fingerprint image with a larger area by using the sensing assembly with a smaller area, and is beneficial to increasing the fingerprint acquisition surface and/or providing the definition of the fingerprint image.
As shown in fig. 3, in some embodiments of the present invention, the fingerprint imaging module further includes: and the light-transmitting cover plate 140 is positioned on one side of the sensing component 120, and the surface of the light-transmitting cover plate 140, which faces away from the sensing component 120, is the first contact surface 130.
In addition, in some embodiments of the present invention, the fingerprint imaging module further includes: and a supporting member 150, wherein the supporting member 150 is filled between the sensing assembly 120 and the transparent cover plate 140, so that a dihedral angle α is formed between the photosensitive surface 121 and the first contact surface 130.
In some embodiments of the present invention, the refractive index of the supporting member 150 is equal to the refractive index of the transparent cover plate 140, so as to reduce the optical energy loss at the interface between the supporting member 150 and the transparent cover plate 140. Generally, the material of the light-transmissive cover plate 140 is glass; therefore, the material of the supporting member 150 may be an optical cement having a refractive index close to that of glass.
In other embodiments, the refractive index of the support member is similar to the refractive index of the light transmissive cover plate. Specifically, when the refractive index of the glass is larger than that of the support member, the difference in refractive index between the glass and the support member should be smaller than that between the glass and air (about 0.5); when the refractive index of the glass is smaller than the refractive index of the support member, then the refractive index of the support member is within about 0.3 of the refractive index of the glass.
In other embodiments, the sensing assembly is in contact with the light-transmitting cover plate, and the surface of the light-transmitting cover plate in contact with the sensing assembly and the first contact surface form the preset included angle. Specifically, can be directly with the structure that two upper and lower surfaces of printing opacity apron burnishing and polishing become and have the predetermined contained angle, promptly the printing opacity apron is two upper and lower surface nonparallel structures, and for example the upper surface does first contact surface is used for contacting the fingerprint, just so can directly with sensing component pastes on the lower surface of printing opacity apron, and need not to set up the backup member. Specifically, the first surface of the light-transmitting cover plate may be a plane, the second surface of the light-transmitting cover plate may be an inclined plane, the first surface is opposite to the second surface, the first surface is used as the first contact surface, and the second surface of the light-transmitting cover plate is in contact with one side of the sensing surface of the sensing assembly, that is, the thickness of the light-transmitting cover plate is gradually reduced from one end of the surface of the light-transmitting cover plate to the other end of the surface of the light-transmitting cover plate.
In some embodiments of the present invention, the transparent cover plate 140 has a preset inclined surface 141, the point light source assembly 110 is located on the preset inclined surface 141, and incident light generated by the point light source assembly 110 is incident into the transparent cover plate 140 through the preset inclined surface 141, so that light beams of the incident light generated by the point light source assembly 110 are utilized more effectively and more extensively, a fingerprint imaging effect is improved, and energy consumption is reduced.
In some embodiments of the present invention, the magnification of the position point X on the fingerprint image is
Wherein g is the minimum distance between the photosensitive surface 121 and the first contact surface 130, α is the included angle between the plane where the photosensitive surface 121 is located and the plane where the first contact surface 130 is located, d is the distance between the point light source assembly 110 and the first contact surface 130, and X is the distance between the position point X and the origin point line O, wherein the origin point line O is the connecting line of the minimum distance between the photosensitive surface 121 and the first contact surface 130.
As shown in fig. 3, a preset included angle α is formed between the sensing element 120 and the transparent cover plate 140, the sensing element 120 is attached to the surface of the transparent cover plate 140 at an origin line O, that is, the sensing element 120 rotates by an angle α with the origin line O as a rotation axis, with the position parallel to the transparent cover plate 140 as a starting point. And establishing a one-dimensional coordinate system by taking the original point line O as a circular point and taking a straight line perpendicular to the original point line O as an X axis in the sensing surface 120, wherein a distance X between a position point X on the fingerprint image and the original point line O is a coordinate value of the position point X in the one-dimensional coordinate system. It can be seen that the magnification of the position point X on the fingerprint image is the local magnification, i.e. the magnification when a certain coordinate point X is close to Δ X → 0 in the one-dimensional coordinate system.
It should be noted that a portion of the photosensitive surface 121 contacting the transparent cover plate 140, that is, a point of the photosensitive surface 121 having the smallest distance from the first contact surface 130, is connected to form a straight line, x in the fingerprint image magnification represents a distance between a position on the photosensitive surface 121 and the straight line, and positions parallel to the straight line in the photosensitive surface 121 have the same magnification, that is, positions on the photosensitive surface 121 having the same distance from the straight line have the same magnification.
It should be noted that, as shown in fig. 3, in the present embodiment, the point light source assembly 110 is located between the first contact surface 130 and the position on the photosensitive surface 121 where the distance from the first contact surface 130 is the smallest, that is, g is greater than d, that is, the point light source assembly 110 is located between the lowest point of the sensing assembly 120 and the first contact surface 130.
In other embodiments of the present invention, as shown in fig. 4, the distance d between the point light source assembly 210 and the first contact surface 230 may also be greater than the minimum distance g between the light-sensing surface 221 and the first contact surface 230.
In the fingerprint image, the magnification is related to the position of the position point X on the photosensitive surface 221, that is, the distance X between the position point X and the original point line O, that is, the magnification of the fingerprint image is related to the position of the position point X on the photosensitive surface 221, so that the obtained fingerprint image generates a certain deformation, but because the structure of the fingerprint imaging module is fixed, the relationship between the magnification and the position is also fixed, so that the deformation can be recovered by an image correction method. On the other hand also can be through the setting of fingerprint imaging module structure, obtain suitable fingerprint image magnification to reach the purpose that obtains the fingerprint image of bigger area with the sensing subassembly of less area, with increase fingerprint collection area and or improve fingerprint image definition.
Referring to fig. 5, a schematic cross-sectional view of another embodiment of the fingerprint imaging module of the present invention is shown
The present embodiment is the same as the previous embodiments, and the description of the present invention is omitted. The difference between the above embodiments is that in this embodiment, the plane of the photosensitive surface 321 is orthogonal to the plane of the first contact surface 330. Because the amplification rate of the fingerprint image is related to the included angle alpha between the plane of the photosensitive surface 321 and the plane of the first contact surface 330, the fingerprint acquisition area is increased or the fingerprint image definition is improved by enabling the plane of the photosensitive surface 321 to be orthogonal to the plane of the first contact surface 330.
In some embodiments of the present invention, the fingerprint imaging module further comprises: a right-angle prism 340, wherein the right-angle prism 340 has two mutually orthogonal right-angle side surfaces 340a/340b and an oblique side surface 340c between the two right-angle side surfaces 340a/340 b; the photosensitive surface 321 of the sensing component 320 faces one right-angle side 340a of the right-angle prism 340. Specifically, the photosensitive surface 321 is attached to the right-angle surface 340 a.
As shown in fig. 5, in the present embodiment, another right-angled side surface 340b of the right-angled prism 340 is the first contact surface 330, and the incident light generated by the point light source assembly 310 enters the right-angled prism 340 from an oblique side surface 340c of the right-angled prism 340, is reflected on the first contact surface 330, and then is projected to the right-angled side surface 340a toward which the light-sensing surface 321 faces.
The orthogonal photosensitive surface 321 and the first contact surface 330 are formed by the orthogonal right-angle side surfaces 340a/340b of the right-angle prisms 340, so that the structure is simple and compact, and the assembly difficulty can be reduced. As shown in fig. 6, far-field light ray 350 can also transmit through the inclined side surface 340c and the first contact surface 330 in sequence, and does not interfere with incident light generated by the point light source assembly 310. The application scene of this embodiment can be used for transparent glass door and window for example, will fingerprint imaging module group embedding door and window both can the fingerprint unblock, does not influence door and window's transparency again.
It should be noted that, as shown in fig. 5 and fig. 6, in the present embodiment, the right-angle prism 340 is a right-angle triangular prism, and the right-angle prism 340 includes 3 side surfaces, i.e., 2 right-angle side surfaces and 1 oblique side surface. In other embodiments of the present invention, the right angle prism may include more than 3 sides.
In the embodiment of the fingerprint imaging module shown in fig. 7, the rectangular prism 540 is a rectangular prism, the rectangular prism 540 includes 4 side surfaces, the rectangular side surface 540a and the rectangular side surface 540b are orthogonal to each other, and the inclined side surface 540c is located between 2 rectangular side surfaces 540a/540 b; the sensing surface 521 of the sensing element 520 faces the right-angled side 540a, the right-angled side 540b is the first contact surface 530, the point light source assembly 510 is located on the oblique side 540c, and the incident light generated by the point light source assembly 510 is incident on the right-angled prism from the oblique side 540c of the right-angled prism 540.
Further, since the distance between the incident point of the incident light on the inclined side surface 540c and the right-angled side surface 540a to which the photosensitive surface 521 faces is large, a part of the incident light reflected by the first contact surface 530 is projected onto the inclined side surface 540c, and is reflected again by the inclined side surface 540 and then projected onto the right-angled side surface 540a to which the photosensitive surface 521 faces.
In addition, the sensing surface and the first contact surface may be orthogonal to each other by a rectangular prism, and the sensing surface and the first contact surface may be oblique to each other by a rectangular prism. As shown in fig. 8, in the embodiment of the fingerprint imaging module, the light-sensing surface 421 of the sensing element 420 faces one right-angled side surface 440a of the right-angled prism 430, the point light source element 410 is located on the other right-angled side surface 440b of the right-angled prism 430, and the oblique side surface 440c of the right-angled prism is the first contact surface 430. The incident light generated by the point light source assembly 410 is incident on the right-angle prism 440 from the other right-angle side 440b of the right-angle prism 440, reflected on the first contact surface 430, and then projected to the right-angle side, toward which the photosensitive surface 421 faces, to be received by the photosensitive surface 421.
It should be noted that the fact that the light-sensing surface is orthogonal to the first contact surface by the right-angle prism is only an example. In other embodiments of the present invention, the two may be orthogonal to each other by other structures. As shown in fig. 9, the fingerprint imaging module includes: the light-transmitting cover plate 640 has two opposite surfaces, one of the surfaces is the first contact surface 630, and the supporting part 650 is located on the other surface. The light sensing surface 621 of the sensing element 620 is attached to one surface of the supporting member 650, and the surface to which the light sensing surface 621 is attached is perpendicular to the first contact surface 630, so that the light sensing surface 621 is perpendicular to the first contact surface 630. The light-transmissive cover 640 further has a side surface (not shown) between the two surfaces, and the point light source assembly 610 is located on the side surface. Incident light generated by the point light source assembly 610 is incident into the light-transmitting cover plate 640 through the side surface and is projected to the first contact surface 630; the light is reflected by the first contact surface 630, projected into the supporting member 650 through a surface opposite to the first contact surface 630, and further projected onto a surface attached to the photosensitive surface 621 to be received by the photosensitive surface 621. In some embodiments, the support member 650 may be glass, or the support member 650 and the light transmissive cover plate 640 may be an integral piece formed of one piece of glass. In addition, in some embodiments, the point light source assembly 610a may also be disposed on a side surface of the support part 650a (as shown in fig. 10). Referring to fig. 11, a schematic cross-sectional structure diagram of another embodiment of the fingerprint imaging module of the present invention is shown.
The present embodiment is the same as the previous embodiments, and the description of the present invention is omitted. The difference between this embodiment and the foregoing embodiment is that, in this embodiment, the fingerprint imaging module further includes: a second contact surface 730b, the second contact surface 730b is used for inputting second fingerprint information, and the second contact surface 730b is arranged opposite to the first contact surface 730 a.
The sensing element 720 is located between the second contact surface 730b and the first contact surface 730a, and the plane of the light-sensing surface 721 intersects with the plane of the second contact surface 730b and the plane of the first contact surface 730 a; the point light source assembly 710 is located between the first contact surface 730a and the second contact surface 730b, and is disposed opposite to the sensing assembly 720; incident light generated by the point light source module 710 is reflected by the first contact surface 730a and the second contact surface 730b, and then received by the photosensitive surface 721 of the sensor module 720.
In some embodiments of the present invention, the fingerprint imaging module further comprises: a waveguide member 740, the waveguide member 740 having a first surface (not labeled) and a second surface (not labeled) opposite to each other, and a first side surface (not labeled) and a second side surface (not labeled) opposite to each other and located between the first surface and the second surface; the first surface is the first contact surface 730 a; the second surface is the second contact surface 730 b; the point light source assembly 710 is located on the first side surface, the incident light generated by the point light source assembly 710 is transmitted into the waveguide assembly 740 through the first side surface, and the photosensitive surface 721 of the sensing assembly 720 faces the second side surface.
Referring to fig. 12, a schematic structural diagram of another embodiment of the fingerprint imaging module of the present invention is shown.
The present embodiment is the same as the previous embodiments, and the description of the present invention is omitted. The difference between this embodiment and the foregoing embodiments is that, in this embodiment, the point light source assembly of the fingerprint imaging module includes 2 point light sources 810a/810b, and the 2 point light sources 810a/810b are located in a perpendicular plane of a line intersecting a plane where the light sensing surface 821 is located and a plane where the first contact surface 830 is located and are distributed on two sides of the sensing assembly 820. The fingerprint image is obtained by adopting the point light source assembly comprising the point light sources 810a/810b, so that the area of fingerprint imaging can be increased, and the signal intensity of the fingerprint imaging can be improved.
In some embodiments, the 2 point light sources may not be located in the same plane, and the two point light sources are independent from each other in position relationship, so that dual fingerprint collection may be implemented, as shown in fig. 12, the position where the point light source 810a irradiates on the first contact surface 830 and the position where the point light source 810b irradiates on the first contact surface 830 may be respectively used for collecting two fingerprints, or multi-position collection may be implemented, that is, when the fingerprint imaging module senses that a left side position in fig. 12 is pressed, the point light source 810a emits light for fingerprint imaging, and when the fingerprint imaging module senses that a right side position in fig. 12 is pressed, the point light source 810b emits light for fingerprint imaging.
In addition, the embodiment of the utility model also provides electronic equipment. The electronic equipment comprises the fingerprint imaging module.
In a specific implementation, the electronic device may be a terminal such as a mobile phone, a computer, or the like, or an electronic lock, an intelligent lock (e.g., an intelligent door lock), a fingerprint lock, or the like, which is not limited in particular.
In summary, the magnitude of the dihedral angle between the plane of the photosensitive surface and the plane of the first contact surface affects the magnification of the fingerprint information, and the magnification of the fingerprint information is related to the fingerprint acquisition area and the definition of the fingerprint image. Compared with the scheme that the photosensitive surface and the first contact surface are parallel to each other, the technical scheme of the utility model can obtain a larger-area fingerprint image by using the sensing assembly with a smaller area, and is beneficial to increasing the fingerprint acquisition area or improving the fingerprint image definition.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (18)
1. The utility model provides a fingerprint imaging module which characterized in that includes:
a point light source assembly for generating incident light;
a sensing assembly having a photosurface;
a first contact surface for inputting first fingerprint information;
the plane of the light sensing surface of the sensing assembly and the plane of the first contact surface form a preset included angle; incident light generated by the point light source assembly is reflected on the first contact surface and then received by the photosensitive surface of the sensing assembly to obtain a fingerprint image.
2. The fingerprint imaging module of claim 1, further comprising: the light-transmitting cover plate is positioned on one side of the sensing assembly, and the surface of the light-transmitting cover plate, which is back to the sensing assembly, is the first contact surface.
3. The fingerprint imaging module of claim 2, further comprising: and the supporting component is filled between the sensing assembly and the light-transmitting cover plate.
4. The fingerprint imaging module of claim 3, wherein the refractive index of the support member is equal to or similar to the refractive index of the transparent cover plate.
5. The fingerprint imaging module of claim 4 wherein the material of the support member is an optical glue.
6. The fingerprint imaging module of claim 3, wherein the transparent cover plate or the supporting member has a predetermined slope, the point light source assembly is located on the slope, and incident light generated by the point light source assembly is incident on the transparent cover plate through the slope.
7. The fingerprint imaging module of claim 1, further comprising: the right-angle prism comprises two mutually orthogonal right-angle side surfaces and an oblique side surface positioned between the two right-angle side surfaces;
the photosensitive surface of the sensing assembly faces to one right-angle side surface of the right-angle prism;
the other right-angle side surface of the right-angle prism is the first contact surface, and incident light generated by the point light source assembly enters the right-angle prism from the oblique side surface of the right-angle prism, is reflected on the first contact surface, and then is projected to the right-angle side surface towards which the photosensitive surface faces.
8. The fingerprint imaging module of claim 7, wherein far field light is transmitted through the angled side and the first contact surface in sequence.
9. The fingerprint imaging module of claim 7, wherein the incident light generated by the point light source assembly is reflected by the first contact surface, and then reflected again by the inclined side surface and projected to the right-angled side surface facing the photosensitive surface.
10. The fingerprint imaging module of claim 1, further comprising: the second contact surface is used for inputting second fingerprint information, and the second contact surface is arranged opposite to the first contact surface;
the sensing assembly is positioned between the second contact surface and the first contact surface, and the plane of the photosensitive surface is intersected with the plane of the first contact surface and the plane of the second contact surface;
the point light source assembly is positioned between the first contact surface and the second contact surface and is opposite to the sensing assembly;
incident light generated by the point light source component is reflected on the first contact surface and the second contact surface respectively and then received by the light sensing surface of the sensing component.
11. The fingerprint imaging module of claim 10, further comprising: the waveguide component is provided with a first surface, a second surface, a first side surface and a second side surface, wherein the first surface and the second surface are opposite, and the first side surface and the second side surface are positioned between the first surface and the second surface and are opposite;
the first surface is the first contact surface; the second surface is the second contact surface;
the point light source assembly is located on the first side face, incident light generated by the point light source assembly is incident to the waveguide component through the first side face, and a light sensing face of the sensing assembly faces the second side face.
12. The fingerprint imaging module of claim 1, further comprising: the right-angle prism comprises two mutually orthogonal right-angle side surfaces and an oblique side surface positioned between the two right-angle side surfaces;
the photosensitive surface of the sensing assembly faces to one right-angle side surface of the right-angle prism;
the oblique side surface of the right-angle prism is the first contact surface, and incident light generated by the point light source assembly enters the right-angle prism from the other right-angle side surface of the right-angle prism, is reflected on the first contact surface, and then is projected to the right-angle side surface towards which the photosensitive surface faces.
13. The fingerprint imaging module of claim 1, wherein the point light source assembly comprises 2 point light sources, and the 2 point light sources are located in a plane perpendicular to an intersection line of the plane of the photosensitive surface and the plane of the first contact surface and distributed on two sides of the sensing assembly.
14. The fingerprint imaging module of claim 1 wherein the magnification of the location point X on the fingerprint image is
Wherein g does the sensitization face with minimum distance between the first contact surface, alpha does sensitization face place plane with the planar contained angle in first contact surface place, d point light source subassembly with distance between the first contact surface, X do distance between position point X and the origin line O, wherein origin line O does the sensitization face with minimum distance's line between the first contact surface.
15. The fingerprint imaging module of claim 1, 3, 7, or 10, wherein the plane of the photosensitive surface is orthogonal to the plane of the first contact surface.
16. The fingerprint imaging module of claim 2, wherein the sensing element is in contact with the transparent cover plate, and a surface of the transparent cover plate in contact with the sensing element is at the predetermined angle with respect to the first contact surface.
17. An electronic device, comprising:
the fingerprint imaging module of any one of claims 1 to 16.
18. The electronic device of claim 17, comprising a cell phone, a computer, an onboard electronic device, a control device for an instrument or meter, or an electronic lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120972859.4U CN215814198U (en) | 2021-05-08 | 2021-05-08 | Fingerprint imaging module and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120972859.4U CN215814198U (en) | 2021-05-08 | 2021-05-08 | Fingerprint imaging module and electronic equipment |
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| Publication Number | Publication Date |
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| CN215814198U true CN215814198U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120972859.4U Active CN215814198U (en) | 2021-05-08 | 2021-05-08 | Fingerprint imaging module and electronic equipment |
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| Country | Link |
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| CN (1) | CN215814198U (en) |
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2021
- 2021-05-08 CN CN202120972859.4U patent/CN215814198U/en active Active
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