CN114565948A

CN114565948A - Optical identification device

Info

Publication number: CN114565948A
Application number: CN202210129183.1A
Authority: CN
Inventors: 王炯翰; 洪浚郎; 林碧辉
Original assignee: Yihong Technology Co ltd; Yihong Technology Chengdu Co ltd
Current assignee: Yihong Technology Co ltd; Yihong Technology Chengdu Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-05-31
Also published as: TWI806428B; TW202332952A

Abstract

An optical identification device includes a plurality of sets of lens sets, an optical filter and a sensing component. The array lens assembly includes optical lens elements. Each of the optical lens sets comprises at least two lenses. The optical filter is located at one side of the group lens group. The sensing component is positioned at one side of the optical filter far away from the group of lens groups. The sensing component is optically coupled with the optical lens group through the optical filter. The effect is to amplify the signal receiving area of the optical identification device and obtain clear optical signals at the same time.

Description

Optical identification device

Technical Field

The present disclosure relates to an optical identification device.

Background

The fingerprint recognition system applied to touch screens of electronic devices (such as mobile phones and flat panels) reflects light from a light-emitting screen to an optical recognition system installed inside the electronic device mainly through a fingerprint of a finger, and further converts the light into an electric signal for recognition so as to achieve the effect of protecting personal data. However, because of the physical structure of the conventional optical recognition system, fingerprint recognition can be performed only in a specific area of the screen. The large-scale (e.g., the entire screen of the electronic device) fingerprint recognition area is still difficult to achieve at low manufacturing cost.

Therefore, how to provide an optical recognition device capable of solving the above problems is one of the problems that the industry needs to invest in research and development resources to solve.

Disclosure of Invention

In view of the above, an objective of the present disclosure is to provide an optical recognition device that can effectively solve the above problems.

The disclosure relates to an optical identification device comprising a plurality of groups of lens sets, an optical filter and a sensing component. The array lens assembly includes optical lens elements. Each of the optical lens sets comprises at least two lenses. The optical filter is located at one side of the group lens set. The sensing component is positioned at one side of the optical filter far away from the group of lens groups. The sensing component is optically coupled with the optical lens group through the optical filter.

In some embodiments, the sensing element has an image sensing area, and an optical axis of one of the optical lens groups is parallel to a central axis perpendicular to the image sensing area.

In some embodiments, each of the optical lens groups includes at least one aspherical lens.

In some embodiments, the optical lens assembly further includes another optical lens assembly disposed beside the central axis, and at least two of the lenses of the another optical lens assembly have curvatures and at least one of an aspherical mirror and a free-form surface.

In some embodiments, the other optical lens group further includes a reflective mirror disposed on a side of the other optical lens group adjacent to the sensing device.

In some embodiments, the other optical lens group further includes a collimating lens disposed on a side of the other optical lens group adjacent to the sensing device and between the at least two lens elements and the reflecting mirror.

In some embodiments, the optical lens assemblies are arranged in a rectangular array, and each lens of the optical lens assemblies has a rectangular outer edge.

In some embodiments, the optical identification device further includes a vignetting diaphragm disposed at one side of the plurality of lens groups, the vignetting diaphragm corresponding to one of the plurality of lens groups, and the vignetting diaphragm is a rectangular opening.

In some embodiments, the optical lens assemblies are arranged in a hexagonal array, and each lens of the optical lens assemblies has a hexagonal outer edge.

In some embodiments, the optical identification device further includes a vignetting diaphragm disposed at one side of the plurality of lens groups, the vignetting diaphragm corresponding to one of the plurality of lens groups, the vignetting diaphragm being a hexagonal opening.

In some embodiments, the optical lens elements of the array lens assembly are arranged randomly.

In summary, in the optical identification device of the present disclosure, the array lens sets are arranged in different manners (e.g., rectangular arrangement, hexagonal arrangement, combined arrangement, and random arrangement) to provide different optical information receiving areas, and the array lens sets are composed of a plurality of optical lens sets to provide the expanded optical information receiving areas at the same time. In addition, the outer edge shape of the optical lens group and the matching vignetting diaphragm can further control the optical information imaging area, so that one sensing component can be used for correctly splicing a plurality of optical lens groups and acquiring optical signals. And through the synergistic effect of the optical lens group and the vignetting diaphragm, the optical identification device can obtain correct and clear optical signals only by using one sensing component corresponding to a plurality of optical lens groups.

Drawings

Aspects of the present disclosure are best understood from the following detailed description when read in connection with the accompanying drawings. It should be noted that, in accordance with standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

Fig. 1 is a side schematic view of an optical recognition device according to some embodiments of the present disclosure.

Fig. 2 is an image field of view of an optical recognition device according to some embodiments of the present disclosure.

Fig. 3A is a front view of an optical recognition device according to some embodiments of the present disclosure.

Fig. 3B is a front view of an optical recognition device according to other embodiments of the present disclosure.

FIG. 4A is a schematic side view of an optical recognition device according to other embodiments of the present disclosure.

FIG. 4B is a schematic side view of an optical recognition device according to other embodiments of the present disclosure.

Fig. 5 is a usage scenario of an optical recognition device according to some embodiments of the present disclosure.

Reference numerals:

100 optical identification device

110 group type lens group

112,114,116,412,414,416,418,512,513,514,515,516,517,518 optical lens group

112a,112b,114a,114b,116a,116b lenses

114c,116c mirrors

114d,116d collimating lens

120 optical filter

130,320 sensing assembly

140 lens barrel

150 vignetting diaphragm

200 display screen

310 imaging circle

152,154,156,412a,414a,416a,418a,512a,513a,514a,515a,516a,517a,518a opening

A is a shaft

Detailed Description

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided objects. Specific examples of components and arrangements are described below to simplify the present disclosure. Of course, these are merely examples and are not intended to be limiting. For example, formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Also, for simplicity of description, spatially relative terms, such as "below … …," "below … …," "below," "over … …," "above," and similar terms, may be used herein to describe one element or feature's relationship to another (additional) element or feature as illustrated in the figures. These spatially relative terms are intended to encompass different orientations of the component in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As used herein, "about," "approximately," or "substantially" generally means falling within twenty percent, or within ten percent, or within five percent of a given value or range. The numerical values given herein are approximations that may vary depending upon the particular terminology used, such as "about", "approximately" or "substantially", unless otherwise specifically indicated.

Fig. 1 is a side view of an optical recognition device 100 according to some embodiments of the present disclosure. Referring to fig. 1, an optical identification device 100 includes a plurality of sets of lens groups 110, an optical filter 120 and a sensing element 130. The array lens assembly 110 includes optical lens elements 112,114, 116. Each of the optical lens groups 112,114,116 comprises at least two

lenses

112a,112b,114a,114b,116a,116 b. The optical filter 120 is located at one side of the group lens assembly 110. The sensing element 130 is located on a side of the optical filter 120 away from the lens assembly 110. The sensing device 130 is optically coupled to the optical lens assembly 112,114,116 via the optical filter 120.

The optical recognition device 100 can be disposed on the display screen 200, and receives the optical signal in a specific area in front of the optical recognition device 100, and then the optical signal is received by the array lens assembly 110 and transmitted to the sensing element 130. In some embodiments, the optical recognition device 100 further includes a lens barrel 140. The lens barrel 140 accommodates and fixes the group lens assembly 110, the optical filter 120, and the sensing assembly 130. Specifically, the lens barrel 140 may be a separate structure or may be a part of another housing. For example, if the optical recognition device 100 is installed in a housing, the portion of the housing covering the optical recognition device 100 may be regarded as the lens barrel 140 of the optical recognition device 100.

In the embodiment shown in fig. 1, the array lens assembly 110 includes three optical lens elements 112,114, 116. However, in practice, the lens assembly 110 may have other numbers of lens groups. In some embodiments, the array lens assembly 110 has a radial symmetry. The axis of symmetry may be substantially defined by a central axis a of the image sensing area of the sensing element 130, but the disclosure is not limited thereto. The lens assembly 110 is illustrated in a simplified version in fig. 1, and for simplicity and convenience of illustration, the optical lens elements in the upper half of the optical lens elements 112 are omitted. However, in other embodiments, the optical lens elements of the array lens assembly 110 can be combined in other manners according to requirements. The different optical lens groups have independent optical axes respectively.

The optical axis is an imaginary line and defines a path of light conducted by the optical system, and the light propagates along the optical axis after passing through the optical axis. By calculating the respective optical axes of each of the optical lens assemblies (e.g., the optical lens assemblies 112,114, 116), the plurality of optical lens assemblies 112,114,116 are further arranged at suitable positions in the multi-lens assembly 110, so that the optical signals received by each of the optical lens assemblies 112,114,116 can be faithfully transmitted to the sensing element 130. For example, in some embodiments, the sensing element 130 has an image sensing area, and the optical axis of one of the optical lens assemblies 112,114,116 is parallel to a central axis a perpendicular to the image sensing area. Specifically, in the embodiment shown in fig. 1, the optical axis of the optical lens assembly 112 is coincident with the central axis a of the image sensing area (therefore, the optical lens assembly 112 may also be referred to as a coaxial optical lens assembly 112), but the disclosure is not limited thereto. The foregoing description provides only one arrangement basis for the optical lens groups 112,114,116 in the multi-group lens group 110, but other suitable arrangements may be used.

The calculation of the optical axis is also related to the shape and position of the

lenses

112a,112b,114a,114b,116a,116b comprised in the optical lens group 112,114, 116. For example, in fig. 1, the two

lenses

112a and 112b included in the optical lens assembly 112 have rotational symmetry, that is, when the relative positions of the

lenses

112a and 112b are not changed and the

lenses

112a and 112b are rotated respectively by using the central axes of the lenses as the rotation axes, the optical axis of the optical lens assembly 112 will not be changed. However, for other optical lens groups without rotational symmetry, the calculation of the optical axis is relatively more complicated. In addition to the symmetry of the lenses (e.g.,

lenses

112a,112 b) affecting the position of the optical axis, the curvature of the lens surfaces will also alter the optical path. In some embodiments, the optical lens assembly 112 includes an aspherical mirror. Specifically, referring to the optical lens assembly 112 shown in fig. 1, both

lenses

112a and 112b are aspheric lenses. The use of an aspherical mirror has better aberration correction than a spherical mirror and thus provides better and ideal optical signals. However, the lenses constituting the optical lens assembly 112 are not limited to aspheric lenses, and various suitable lenses can be used in combination with other lenses included in the optical lens assembly 112 to achieve the best imaging effect, such as a free-form surface.

On the other hand, as can be seen from fig. 1, the optical axes of the

optical lens assemblies

114 and 116 are not coincident with the central axis a of the image sensing area (therefore, the

optical lens assemblies

114 and 116 can also be referred to as non-coaxial optical lens assemblies 114 and 116). The areas corresponding to the

optical lens elements

114 and 116 are the periphery of the image sensing area, compared to the central area of the image sensing area corresponding to the optical lens element 112. Therefore, the

lenses

114a,114b,116a,116b used in the optical lens assemblies 114,116 need to focus more on reducing the aberration in the peripheral area to maintain the fidelity of the optical signal. One solution is to reduce the imaging difference by using a lens of a specific shape. For example, in some embodiments, the optical lens assembly 112 further includes another optical lens assembly 114 (or optical lens assembly 116) arranged beside the central axis a, two of the at least two

lenses

114a,114b of the another optical lens assembly 114 have curved surfaces, and the curved surfaces have two areas with two curvatures respectively. Specifically, the

lenses

114a,114b,116a,116b included in the optical lens assemblies 114,116 are multi-curved lenses that can have multiple curvatures at different areas on the same surface. For example, since the lens 116a is likely to generate aberration or distortion near the edge of the image capture range, a surface with a first curvature may be designed in the lens 116a for the region receiving the edge of the image capture range to improve the aberration or distortion. Moreover, the central area (or other areas not prone to aberration) of the lens 116a adopts the surface with the second curvature to take both the image capturing range and the image quality into consideration, but this disclosure is only directed to one possible embodiment and is not limited thereto. It should be noted that the number of different areas included on the surface of each

lens

114a,114b,116a,116b is not limited to two, and the curvature of the different areas and the curvature of the areas can be adjusted as required to obtain the best imaging effect. The combination of the optical lens elements 112,114,116 (i.e., the combination of the on-axis optical lens element 112 and the off-axis optical lens elements 114, 116) can be used to form a prototype of the multi-lens assembly 110. However, the design details of the respective optical lens assembly still need to be changed according to the present application.

An optical filter 120 is disposed between the group lens assembly 110 and the sensing assembly 130. The optical filter 120 only allows light with a specific wavelength to pass through, so as to highlight the optical signal with a specific wavelength, which is further received by the sensing element 130. The optical filter 120 is disposed to relatively increase the optical signal with a specific wavelength to optimize the quality of the optical signal received by the sensing element 130. For example, the form of the optical filter 120 is not particularly limited to a specific type, and the selection principle is mainly determined by considering the requirement of the sensor assembly 130 and the wavelength distribution of the received light.

Fig. 2 is an image field of view diagram of an optical recognition device 100 according to some embodiments of the present disclosure. Referring to fig. 1 and fig. 2, it can be seen that the circular area in fig. 2 is the imaging circle 310. Specifically, the range of the image circle 310 varies according to the image range formed by all the optical lens elements 112,114,116 in the array lens assembly 110. For example, the imaging circle 310 shown in fig. 2 corresponds to the array lens assembly 110 having a circular imaging range. In addition, FIG. 2 also illustrates the relationship between the sensing element 320 and the imaging ring 310, where the sensing element 320 is the same as the sensing element 130 described above. The sensing element 320 is rectangular in this embodiment, however, the sensing element 320 may have other shapes to correspond to a suitable sensing range. The sensing device 320 may determine the shape of the image to be generated, for example, the rectangular sensing device 320 in FIG. 2 will generate a rectangular image. The arrangement of the imaging ring 310 and the sensing assembly 320 need to be able to cooperate with each other to avoid dead zones of the sensing field of view, in addition to taking into account the shape of the sensing area. In the embodiment shown in fig. 2, the area covered by the imaging circle 310 even exceeds the sensing range of the sensing element 320, but the disclosure is not limited thereto. Generally, the range of the imaging ring 310 for receiving the light signal only needs to cover the sensing range of the sensing element 320.

In addition, in addition to changing the overall combination range of the lens assembly 110, the vignetting stop 150 may be mounted on the corresponding optical lens assembly (e.g., the optical lens assemblies 112,114,116 of fig. 1) to change the imaging range, so as to further reshape the image circle 310. The above two methods for controlling the shape of the image ring 310 can be used together or individually modulated, and the details will be described later.

Fig. 3A is a front view of an optical recognition device 100 according to some embodiments of the present disclosure. Referring to fig. 1, fig. 2 and fig. 3A, fig. 3A is a front view of the optical identification device 100 shown in fig. 1, which illustrates an arrangement method of the group lens assembly 110. In this embodiment, the optical lens elements 412,414,416,418 are arranged in a rectangular array, and each lens of the optical lens elements 412,414,416,418 has a rectangular outer edge. It should be noted that fig. 3A is a front view so that only the outer edge shape of the frontmost lens of the optical lens groups 412,414,416,418 can be seen, but actually the rest of the lenses located behind the illustrated lens have rectangular outer edges. In addition, the optical lens groups 412,414,416,418 are similar to or the same as the optical lens groups 112,114,116 in fig. 1. The number of rectangular optical lens groups 412,414,416,418 is not limited to four, and the number of optical lens groups used will depend on the requirement. Since the rectangular array arrangement is used, the optical lens elements 412,414,416,418 of the array lens assembly 110 also have rectangular outer edges to fully cover the optical signal receiving range, so as to optimize the overall arrangement. However, if other requirements are required, the image circle 310 with rectangular outer edge can be assembled by using optical lens sets with different shapes. In addition, the arrangement basis mentioned in the previous paragraph is combined with the arrangement basis that the optical axis coincides with the central axis a perpendicular to the image sensing area. One of the optical lens groups 412,414,416,418 may have an optical axis parallel to a central axis a (see fig. 1) of the sensing element 130, but the disclosure is not limited thereto.

An embodiment of applying the vignetting stop 150 is also shown in fig. 1 and 3A. Specifically, in the embodiment of fig. 1, the optical identification apparatus 100 further includes a vignetting diaphragm 150 having openings 152,154,156 respectively, disposed at one side of the lens assembly 110, each of the openings 152,154,156 of the vignetting diaphragm respectively corresponding to one of the lens groups 112,114,116 (for example, the opening 152 of the vignetting diaphragm corresponds to the lens group 112). Further, the openings 152,154,156 of the vignetting diaphragm 150 may correspond to the

openings

412a,414a,416a,418a in fig. 3A, and the vignetting diaphragm is a

rectangular opening

412a,414a,416a,418 a. Specifically, referring to fig. 1 and fig. 3A, the vignetting diaphragms are disposed on the sides of the optical lens groups 412,414,416,418 close to the sensing element 130 and have

openings

412a,414a,416a,418a, respectively. In fig. 3A, a vignetting stop (e.g., a vignetting stop having an opening 412 a) is shielded by being located behind an optical lens group (e.g., the optical lens group 412), and thus the opening position and shape of the vignetting stop are illustrated only by dotted lines. However, the vignetting stop opening position in fig. 3A is intended to be illustrative only, and specifically, the position may be adjusted according to imaging requirements. The vignetting stop may be a separate opaque material with

openings

412a,414a,416a,418a, but it is not limited thereto. The vignetting stop may also be part of other housings in other embodiments. In addition, the arranged vignetting diaphragms do not necessarily directly contact with the optical lens groups 412,414,416,418, and whether they are directly contacted or not is determined according to the structures of the vignetting diaphragms themselves. For example, if the vignetting stop is a part of the housing for accommodating the lens assembly 110, the vignetting stop may not be in direct contact with the lens assembly. However, when the vignetting stop is arranged in a frame similar to the optical lens assembly, the vignetting stop may be in direct contact with the optical lens assembly.

Providing vignetting diaphragms with

rectangular openings

412a,414a,416a,418a further limits the range of optical signals received by the optics 412,414,416,418 and directed to the sensing element 130, and thereby controls the size and shape of the image ring 310 (shown in FIG. 2). For example, the vignetting stop illustrated in fig. 3A has

rectangular openings

412a,414a,416a,418a, so that the optical signal derived from each of the optical lens sets 412,414,416,418 will have a rectangular range. In other words, by setting the specific shape of the

vignetting opening

412a,414a,416a,418a, the range of each optical lens group 412,414,416,418 projected to the sensing element 130 can be controlled. Advantageously, since the optical signal receiving ranges of each of the optical lens assemblies 412,414,416,418 have overlapping areas, the optical signal receiving ranges of each of the optical lens assemblies 412,414,416,418 are controlled to be simple geometric figures, and the simple geometric figures have overlapping areas of optical signals that are easy to analyze and process, so that the overall optical signal finally received by the sensing assembly 130 can be adjusted or integrated more conveniently.

Fig. 3B is a front view of the optical recognition device 100 according to other embodiments of the present disclosure. Referring to fig. 1, fig. 2 and fig. 3B, fig. 3B is a front view of the optical identification device 100 shown in fig. 1, which illustrates another arrangement method of the array lens assembly 110. In this embodiment, the optical lens groups 512,513,514,515,516,517,518 are arranged in a hexagonal array, and the lenses of each of the optical lens groups 512,513,514,515,516,517,518 have hexagonal outer edges respectively. As in fig. 3A, since fig. 3B is a front view, only the shape of the outer edge of the frontmost lens of the optical lens group 512,513,514,515,516,517,518 can be seen, however, in reality, the remaining lenses located behind the depicted lens have hexagonal outer edges. The optical lens groups 512,513,514,515,516,517,518 are similar or identical to the optical lens groups 112,114,116 in fig. 1. For the same reason as in the previous paragraph with respect to fig. 3A, in order to achieve the optimal arrangement of the optical lens groups 512,513,514,515,516,517,518, each of them comprises a lens having a hexagonal outer edge. And ultimately forms an imaging collar 310 having a hexagonal outer edge.

The hexagonal optical lens groups 512,513,514,515,516,517,518 in fig. 3B can also be used with vignetting diaphragms (e.g., the vignetting diaphragm 150 in fig. 1 has

openings

512a,513a,514a,515a,516a,517a,518 a) respectively, to better control the range and shape of the projection of the optical lens groups 512,513,514,515,516,517,518 onto the sensing element 130. Specifically, in some embodiments, the optical recognition device 100 further includes a vignetting stop disposed at one side of the lens assembly 110, the vignetting stop corresponding to one of the optical lens groups 512,513,514,515,516,517,518 (e.g., the opening 512a of the vignetting stop corresponding to the optical lens group 512), the vignetting stop being a

hexagonal opening

512a,513a,514a,515a,516a,517a,518 a. The vignetting diaphragm with

hexagonal openings

512a,513A,514a,515a,516a,517a,518a mentioned here can have a similar or identical configuration and have a similar or identical arrangement position as the rectangular opening vignetting diaphragm described in the foregoing fig. 3A. The

hexagonal openings

512a,513a,514a,515a,516a,517a,518a of the vignetting stop can further limit the range of the optical signals derived by each optical lens group 512,513,514,515,516,517,518 so as to control the optical signals received by the sensing device.

It should be noted that the two embodiments illustrated in fig. 3A and fig. 3B are not intended to limit the embodiments of the disclosure, and the scope of the disclosure is not exceeded. In addition, in other embodiments, the optical lens elements in the array lens assembly 110 are randomly arranged. The optical lens assemblies can be randomly arranged non-adjacently as required to receive optical signals, or can be applied to some areas which are not adjacent but all have to receive optical signals. Other arrangements of optical lens elements in the array lens assembly 110, shapes of the vignetting stop 150 or arrangements of the vignetting stop 150, which are not shown in fig. 1-3B, can be used. And, which combination to use will depend on the reception range of the optical signal. For example, if the range of the emitted optical signal is a shape close to a rectangle, such as the shape of the screen of an electronic device (e.g., a mobile phone screen, a touch device screen), the optical lenses arranged in a rectangular arrangement can obtain the optical signal emitted by the electronic device without wasting the receiving range of the redundant optical signal, and the receiving range can be further expanded compared with that of a single optical lens.

Fig. 4A is a schematic side view of an optical recognition device 100 according to other embodiments of the present disclosure. Referring to fig. 1 and 4A, in some embodiments, the non-coaxial

optical lens assemblies

114 and 116 further include

mirrors

114c and 116c disposed on a side of the non-coaxial

optical lens assemblies

114 and 116 adjacent to the sensing element 130. Specifically, mirrors 114c,116c will correspond to non-coaxial optical lens sets 114,116, respectively. In other words, in combination with the array arrangement discussed in the previous paragraphs (e.g., the rectangular arrangement or the hexagonal arrangement shown in fig. 3A and 3B), the

reflectors

114c,116c are also disposed corresponding to the non-coaxial optical lens assemblies 114,116 according to the array arrangement. For example, the optical signal received by the non-coaxial optical lens assembly 114 passes through the mirror 114c and the filter 120 after passing through the

lenses

114a,114b to be received by the sensing element 130. However, the present disclosure is not limited thereto, and other suitable optical components may be added to the optical path without changing the optical path to achieve the effect of improving the quality of the optical signal. The direction of the light signal directed to the sensing element 130 can be further controlled by the

reflectors

114c,116c, so as to ensure that the light signal passing through the mirror (e.g., the

mirror

114a,114b or the

mirror

116a,116 b) can accurately reach and be received by the sensing element 130.

Fig. 4B is a side view of the optical recognition device 100 according to other embodiments of the present disclosure. Referring to fig. 1, 4A and 4B, in some embodiments, the non-coaxial

optical lens assemblies

114 and 116 further include

collimating lenses

114d and 116d disposed on a side of the non-coaxial

optical lens assemblies

114 and 116 adjacent to the sensing element 130 and between at least two lenses (e.g., the lenses 114A and 114B or the lenses 116a and 116B) and the

reflective mirrors

114c and 116 c. Specifically, the

collimating lenses

114d,116d are also disposed corresponding to the non-coaxial optical lens assemblies 114,116, respectively, and can also be arranged in combination with the array arrangement described above. For example, the optical signal received by the non-coaxial optical lens assembly 114 passes through the collimating lens 114d and the reflecting mirror 114c after passing through the

lenses

114a and 114b, and then passes through the optical filter 120 to be received by the sensing element 130. However, the present disclosure is not limited thereto, and other suitable optical components may be added to the optical path without changing the optical path to achieve the effect of improving the quality of the optical signal. The

collimating lenses

114d,116d may collect and enhance the discrete optical signals to provide a clearer single optical signal. Furthermore, the arrangement of the

collimating lenses

114d,116d based on the

reflectors

114c,116c can better ensure that the optical signals are all guided to the sensing element 130, and the optical signals have both high fidelity and high definition.

The actual operation of the optical identification apparatus 100 will be described below. Fig. 5 is a usage scenario of the optical recognition device 100 according to some embodiments of the present disclosure. Referring to fig. 5, the optical recognition device 100 is disposed at one side of the display screen 200. The display 200 may be illuminated by its own light source or by an additional light source (not shown). The user may approach or contact the display screen 200 by his/her own biometric features (e.g., fingerprint) to reflect light from the display screen 200 toward the optical recognition device 100, and further, the biometric features may have the effect of unlocking or operating the display screen 200 through optical recognition. It should be noted that, in fig. 5 and the following description, the group lens assembly 110, the optical filter 120 and the sensing element 130 included in the optical identification device 100 can be used in combination with similar or identical elements (e.g., arrangement of optical lens groups, vignetting stop) mentioned in the preceding paragraphs, and the description is not repeated here.

Referring to the usage illustrated in fig. 5, when the user's finger reflects the light, the light will have a unique reflection pattern in different areas according to the user's fingerprint characteristics. The reflection patterns are received by a plurality of optical lens elements 112,114,116 of the array lens assembly 110. Specifically, the optical signal receiving areas of each of the optical lens assemblies 112,114,116 are substantially different, but adjacent optical lens assemblies may have partially overlapped optical signal receiving areas. For example, the optical lens assemblies 112,114 or the optical lens assemblies 114,116 may have partially overlapped optical signal receiving areas at their boundaries. The light paths shown in FIG. 5 are only drawn to the extent that there is no overlap between each of the optical lens assemblies 112,114, 116. However, in practical applications, the optical signals of the overlapped areas among each of the optical lens assemblies 112,114,116 will be subtracted in the subsequent signal processing process to obtain the correct optical signals. The signals received by the optical lens assemblies 112,114,116 are guided to the image sensing area of the sensing element 130.

It should be noted that the objective of the above-mentioned lens assembly 110 is to make each of the optical lens groups 112,114,116 responsible for collecting high fidelity optical signals of different regions. The optical lens assemblies 112,114,116 can be optimized for imaging by the aforementioned lens shapes, arrangements and vignetting stop arrangements to produce as low distortion optical signals as possible. And further controlling the shape of the imaging circle by using the vignetting diaphragm so as to subsequently piece up the whole optical signal and process the optical signal of the overlapped area. In addition, the optical lens assemblies 112,114,116 further demagnify image the optical signals such that the complete image result obtained by the piecing of each optical lens assembly 112,114,116 can be completely received by the sensing assembly 130. The image sensing area converts the received optical signal into an electrical signal and transmits the electrical signal to an external operation unit for analysis so as to determine the fingerprint characteristics of the user.

The present disclosure uses a single sensing element 130 to receive a plurality of optical lens assemblies (e.g., the optical lens assemblies 112,114,116 shown in fig. 5), so as to reduce the manufacturing cost of the optical identification apparatus 100. However, the single sensing device 130 must be used with an optical imaging system (e.g., the array lens assembly 110) having a good imaging effect to obtain a clear optical signal matching the actual result. The optical signal can contain fingerprint information of the user, and further becomes a biometric key, so that the user can control the operation of the electronic component, and personal data can be protected from being stolen.

As will be apparent from the above description of the embodiments of the present disclosure, in the optical recognition device of the present disclosure, the array lens set is arranged in different ways (e.g., rectangular arrangement, hexagonal arrangement, combined arrangement, and random arrangement) to provide different optical information receiving areas, and the array lens set is composed of a plurality of optical lens sets and also provides an expanded optical information receiving area. In addition, the outer edge shape of the optical lens group is changed and the vignetting diaphragm used in cooperation can further control the area of optical information imaging, so that one sensing assembly is used for correctly splicing a plurality of optical lens groups and acquiring optical signals. And through the synergistic effect of the optical lens group and the vignetting diaphragm, the optical identification device can obtain correct and clear optical signals only by using one sensing component corresponding to a plurality of optical lens groups.

The foregoing has outlined features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions and alterations herein without departing from the spirit and scope of the present disclosure.

Claims

1. An optical identification device, comprising:

the lens group comprises a plurality of optical lens groups, and each of the optical lens groups comprises at least two lenses;

the optical filter is positioned on one side of the group type lens groups; and

and the sensing assembly is positioned on one side of the optical filter far away from the group of lens groups and is optically coupled with the optical lens group through the optical filter.

2. An optical recognition device according to claim 1, wherein the sensing element has an image sensing area, and an optical axis of one of the optical lens groups is parallel to a central axis perpendicular to the image sensing area.

3. An optical identification device according to claim 2 wherein the one of the optical lens groups comprises at least one aspherical lens.

4. An optical identification device according to claim 2 wherein the optical lens assembly further comprises another optical lens assembly arranged beside the central axis, the at least two lenses of the another optical lens assembly having curvatures and at least comprising an aspherical mirror or a free-form surface.

5. An optical identification device according to claim 4 wherein the other optical lens group further comprises a mirror on a side of the other optical lens group adjacent to the sensing element.

6. An optical identification device according to claim 5 wherein the other optical lens group further comprises a collimating lens on a side of the other optical lens group adjacent to the sensing element and between the at least two lenses and the mirror.

7. An optical recognition device according to claim 1, wherein the optical lens assemblies are arranged in a rectangular array, and the at least two lenses of each of the optical lens assemblies each have a rectangular outer edge.

8. The optical identification device as claimed in claim 7, further comprising a vignetting stop disposed at one side of the plurality of lens groups, the vignetting stop corresponding to one of the plurality of lens groups, and the vignetting stop being a rectangular opening.

9. An optical recognition device according to claim 1, wherein the optical lens groups are arranged in a hexagonal array, and the at least two lenses of each of the optical lens groups each have a hexagonal outer edge.

10. The optical identification device as claimed in claim 9, further comprising a vignetting stop disposed at a side of the plurality of lens groups, the vignetting stop corresponding to one of the plurality of lens groups, the vignetting stop being a hexagonal opening.

11. An optical identification device as claimed in claim 1 wherein the optical lens elements in the array lens elements are arranged randomly.