TWM558941U - Image capture apparatus - Google Patents

Abstract

An image capture apparatus is provided in the instant disclosure. The image capture apparatus includes a light guide device an image capture device and a light emitting device. The light guide device having a first side, a second side and a light emitting portion located at the second side. The light emitting portion includes a plurality of enhanced transmission structures. The image capture device is disposed at the second side of the light guide device corresponding to the position of the enhanced transmission structures. A light beam, which is generated by the light emitting device and transmitted at least by the light guide device, is totally reflected to form a signal light beam. Thereafter, the signal light beam passes through the enhanced transmission structures and then received by the image capture device.

Description

Image capture device

The present invention relates to an optoelectronic device, and more particularly to an imaging device.

Existing optical biometric systems can be used to detect and identify faces, sounds, irises, retinas or fingerprints. Taking an optical fingerprint identification system as an example, an image capturing device in an optical fingerprint identification system generally includes a substrate, a light emitting member, a light transmitting member, a light guiding member, and an image sensor, wherein the light emitting member and the image sensor are The light guide is disposed on the substrate, and the light guide is disposed on the light guide and the image sensor, and the light transmissive member is disposed on the light guide.

The light beam generated by the illuminating member is transmitted to the light transmitting member through the light guiding member, and is totally reflected at the interface between the light transmitting member and the environmental medium, and then projected to the image sensor to be received. Since the finger has a plurality of irregular ridges and indentations, when the user places the finger on the light-transmitting member, the ridge will contact the light-transmitting member, but the concave groove will not contact the light-transmitting member. Therefore, the ridges contacting the light transmitting member may destroy the total reflection of the light beam in the light transmitting member, and the concave lines not contacting the light transmitting member will not affect the total reflection of the light beam, thereby causing the fingerprint captured by the image sensor. The pattern has dark lines corresponding to the ridges and bright lines corresponding to the indentations. Then, the fingerprint pattern captured by the image sensor is processed by the image processing device to further determine the identity of the user.

In addition, in the conventional image capturing device, an optical glue is further used to fill a gap between the light guide and the substrate, and to fill a gap between the light guide and the image sensor.

However, due to limitations in process conditions, the optical glue may have tiny bubbles or may not be fully cured. If there is air bubbles in the optical glue between the light guide and the image sensor, or because the optical glue is not fully cured, it is empty. The gap causes the light beam after the light-transmitting member is totally reflected to be totally reflected again before entering the image sensor, and cannot be received by the image sensor. This will make the fingerprint pattern captured by the image sensor incomplete and reduce the recognition.

The technical problem to be solved by the present invention is to provide an image capturing device for the deficiencies of the prior art, which solves the problem that the signal beam is totally reflected again before entering the image capturing component, resulting in a decrease in the visibility of the image capturing device.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide an image capturing device including a light guiding element, an image capturing element, and a light emitting element. The light guiding element has a first side and a second side, the light guiding element has a light exiting portion on the second side, and the light emitting portion is provided with a plurality of antireflection microstructures. The image capturing element is disposed on the second side of the light guiding element corresponding to the plurality of antireflection microstructures. The illuminating element is configured to generate a light beam transmitted in the light guiding element, the light beam forming at least one total reflection in the light guiding element to form a signal beam directed to the plurality of antireflection microstructures, and the signal beam passes through the plurality of antireflection micro The structure is directed to the image capture component.

One of the beneficial effects of the present invention is that the image capturing device provided by the present invention can pass through "the light guiding element has a plurality of antireflection microstructures disposed in the light exiting portion" and the "image capturing component corresponds to a plurality of antireflection The technical solution of the microstructure is disposed on the second side of the light guiding element to prevent the signal beam from being totally reflected again before entering the image capturing component, thereby improving the image recognition degree of the image capturing device.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are provided for reference and description only, and are not intended to limit the present invention.

1, 1', 1" ‧‧‧ image capture device

10‧‧‧Light guiding elements

S1‧‧‧ first side

S2‧‧‧ second side

100‧‧‧Enhanced microstructure

100R‧‧‧ ridgeline

100C‧‧‧ culmination

101‧‧‧Light-receiving area

102‧‧‧Backlight area

C1‧‧‧The first depression

C2‧‧‧second depression

14‧‧‧Substrate

15‧‧‧First reflective element

16‧‧‧Second reflective element

17‧‧‧ Third reflective element

19‧‧‧fourth reflective element

18, 18a, 18b‧‧‧ light absorbing elements

20‧‧ ‧block

F‧‧‧ objects

D1‧‧‧ first direction

D2‧‧‧ second direction

D3‧‧‧ third direction

E1‧‧‧Into the Department of Light

E2‧‧‧Lighting Department

103‧‧‧Optical microstructure

11‧‧‧Lighting components

110‧‧‧ outer surface

12‧‧‧Image capture component

120‧‧‧Light receiving surface

13‧‧‧Lighting elements

G1‧‧‧Optical adhesive

P1‧‧‧Vertical reference plane

Θ1‧‧‧ first angle

Θ2‧‧‧second angle

P2‧‧‧ connection

L‧‧‧beam

L’‧‧‧Signal beam

L1‧‧‧ stray light

C3‧‧‧Depression

FIG. 1 is a schematic cross-sectional view of an image taking device according to an embodiment of the present invention.

2 is a partially enlarged schematic view of a plurality of antireflection microstructures of FIG. 1 in a region II.

FIG. 3 is a partial bottom plan view of a light guiding element according to an embodiment of the present invention.

4 is a partial bottom plan view of a light guiding element according to another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a light guiding element according to another embodiment of the present invention.

Fig. 6 is a cross-sectional view showing the image taking device of another embodiment of the present invention.

FIG. 7 is a cross-sectional view of the image taking device according to still another embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of an image taking device according to still another embodiment of the present invention.

FIG. 9 is a cross-sectional view of the image taking device according to still another embodiment of the present invention.

FIG. 10 is a cross-sectional view of the image taking device according to still another embodiment of the present invention.

Figure 11 is a cross-sectional view showing the image taking device of still another embodiment of the present invention.

The following is a description of an embodiment of the "image taking device" disclosed in the present disclosure by a specific embodiment, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in the present specification. The present invention can be implemented or applied in various other specific embodiments. The details of the present specification can also be variously modified and changed without departing from the concept of the present invention. In addition, the drawings of the present creation are only for the purpose of simple illustration, and are not stated in advance according to the actual size. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the scope of protection of the present invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another, or one signal and another. In addition, the term "or" as used herein may include a combination of any one or more of the associated listed items, depending on the actual situation.

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a cross-sectional view showing the image capturing apparatus of one embodiment of the present invention. 2 is a partially enlarged schematic view of a plurality of antireflection microstructures of FIG. 1 in a region II.

One embodiment of the present invention provides an image taking device 1. The image taking device 1 is used in an environmental medium. In one embodiment, the aforementioned environmental medium is, for example, air, water, or other types of environmental media. The image capturing device 1 can be used to capture an image of an object F for identification. The aforementioned object F is, for example, a user's finger, The palm, the wrist or the eyeball, and the image captured by the image capturing device 1 is, for example, a fingerprint, a palm print, a vein, a pupil, or an iris, but the present invention is not limited thereto.

As shown in FIG. 1, the image capturing apparatus 1 of one embodiment of the present invention includes a substrate 14, a light emitting element 13, a light guiding element 10, a light transmitting element 11, and an image capturing element 12.

The light guiding element 10 is used to transmit a light beam therein. Therefore, the material of the light guiding element 10 can be selected according to the light beam to be transmitted, for example, glass for transmitting visible light, polymethymethacrylate (PMMA) or polycarbonate (PC). In other embodiments, when the light beam to be transmitted by the light guiding element 10 is infrared light or other invisible light, the material of the light guiding element 10 can also be selected according to actual needs. In an embodiment, the refractive index of the light guiding element 10 may be greater than or equal to 1.4 and less than or equal to 1.6, but the creation is not limited.

The light guiding element 10 of the present embodiment has a first side S1 and a second side S2 opposite to the first side S1, and the light guiding element 10 has a light entering portion E1 and a light emitting portion on the second side S2. E2. The light beam L enters the light guiding element 10 from the light entering portion E1 and is transmitted in the light guiding element 10, and then forms a signal light beam L' by at least one total reflection, and then exits the light guiding element from the light exiting portion E2 of the light guiding element 10. 10. In the present embodiment, a plurality of antireflection microstructures 100 are provided in the light exit portion E2 of the light guiding element 10.

It should be noted that when the signal beam L' is entered into the environmental medium (such as air or air bubbles) by the light guiding element 10, the angle of the light beam projected to the light exiting portion E2 is greater than the critical angle of the total reflection of the light guiding element 10. Therefore, the signal beam L' which should originally be emitted by the light exit portion E2 is again totally reflected. Therefore, in the present embodiment, the light-emitting portion E2 has a plurality of anti-transmission microstructures 100 to destroy the total reflection of the signal light beam L'.

Specifically, each of the anti-reflection microstructures 100 has a light receiving area 101 and a backlight area 102. In the present embodiment, the light receiving area 101 makes the incident angle of the signal light beam L' smaller than the total reflection critical angle of the light guiding element 10, and the backlight area 102 causes the incident angle of the signal light beam L' to be larger than the total reflection critical angle. In one embodiment, backlight region 102 will be substantially parallel to the main direction of travel of signal beam L' such that signal beam L' is less likely to be projected in backlight region 102. On the other hand, the light receiving region 101 is substantially perpendicular to the main beam. The traveling direction, and the area of the light receiving area 101 is larger than the area of the backlight area 102, so that most of the signal light beam L' is projected to the light receiving area 101, and the signal light beam L' projected to the light receiving area 101 is less likely to be fully reflection.

Here, please continue to refer to FIG. 1 to FIG. 2. It should be noted that although a small amount of stray light may be projected to the backlight region 102, the stray light projected to the backlight region 102 may be totally reflected without being emitted from the light. The signal emitted by the portion E2 that interferes with the image capturing element 12 causes a ghost. In addition, after the signal beam L' passes through the light receiving area 101, part of the light beam will refract into a light beam of another angle when passing through the backlight area 102 after the light receiving surface 120 of the image capturing element 12, and the light beam will be in the light transmitting element. The outer surface 110 of the 11 is totally reflected, so that the total reflected beam angle is larger than that of the original path, so that the beam travels the route farther than the original path, so that it will not enter the light receiving surface 120 of the image capturing element 12 again. Thereby avoiding the phenomenon of signal aliasing.

Referring to FIG. 2, in the embodiment, the plurality of anti-reflection microstructures 100 are connected to each other, and the cross-sectional shape of each of the anti-transmission microstructures 100 may be mountain-shaped, wavy or zigzag. In the embodiment of FIG. 2, the cross-sectional shape of each of the anti-reflection microstructures 100 is zigzag. In addition, the light receiving region 101 and the backlight region 102 of the present embodiment are both inclined planes.

Please refer to FIG. 2 and FIG. 3 together. Fig. 3 is a partial bottom plan view showing a light guiding element of one embodiment of the present invention. Further, in the embodiment, each of the anti-reflection microstructures 100 is an asymmetric protrusion, and the asymmetric protrusions extend along the first direction D1 and are arranged side by side along the second direction D2.

Each of the asymmetric studs has a ridgeline 100R, that is, a boundary line between the light receiving region 101 and the backlight region 102. In the present embodiment, a vertical reference plane P1 passing through the ridgeline 100R is defined. As shown in FIG. 2, the vertical reference plane P1 is parallel to the third direction D3, that is, parallel to the thickness direction of the light guiding element 10. The light receiving area 101 and the backlight area 102 are respectively located on opposite sides of the vertical reference plane P1. The light receiving area 101 forms a first angle θ1 with the vertical reference plane P1, and the backlight area 102 forms a second angle θ2 with the vertical reference plane P1. In the present embodiment, the first included angle θ1 is greater than the second included angle θ2 to ensure that most of the light beam can be projected to the light receiving region 101 and is not totally reflected again.

In addition, in the present embodiment, for two adjacent anti-reflection microstructures 100, the edge of the light-receiving region 101 of one of the anti-reflection microstructures 100 coincides with the edge of the backlight region 102 of the other anti-reflection microstructure 100. . That is, a connection region for connecting the two anti-reflection microstructures 100 is not formed between two adjacent anti-reflection microstructures 100 to further reduce the probability of the beam being totally reflected. However, in other embodiments, as long as the angle of inclination of the connection region with respect to the vertical reference plane P1 can prevent the beam from being totally reflected or does not affect the path of the beam, it can also be between every two adjacent anti-reflection microstructures 100. Set the connection area.

In addition, the appearance of the anti-reflection microstructure 100 of the present embodiment is not limited to the asymmetric stud, and the light-receiving area 101 and the backlight area 102 may also be curved surfaces, wherein the curved surface includes, for example, a concave surface or a convex surface. Referring to FIG. 4, a partial bottom view of a light guiding element of another embodiment of the present invention is shown. In the present embodiment, the plurality of anti-reflection microstructures 100 are arranged in an array, and each of the anti-reflection microstructures 100 is an eccentric microlens.

As shown in FIG. 4, the bottom cross-sectional shape of each of the anti-reflection microstructures 100 is circular, however, the center of the apex 100C of the anti-reflection microstructure 100 is offset from the center of the bottom cross-sectional shape (circular) as viewed from the bottom direction. . That is, the apex 100C of the anti-reflection microstructure 100 is not aligned to the center of the bottom cross-sectional shape (circular). In this embodiment, the edges of each of the anti-reflection microstructures 100 and the edges of the other anti-reflection microstructures 100 are connected to each other.

In addition, in the present embodiment, the apex 100C of all the anti-reflection microstructures 100 defining the same row arranged along the first direction D1 forms a line P2, and the connection line P2 can surface the surface of each of the anti-reflection microstructures 100. The area is divided into a light receiving area 101 and a backlight area 102. Specifically, the light receiving area 101 is a surface area located at the right half of the line P2, and the backlight area 102 is a surface area located at the left half of the line P2. As can also be seen from FIG. 4, the area of the light receiving area 101 may be larger than the area of the backlight area 102.

Referring to FIG. 5, a partial cross-sectional view of a light guiding element of another embodiment of the present invention is shown. Specifically, FIG. 5 may be a schematic cross-sectional view of the plurality of anti-reflection microstructures 100 of FIG. 4 in the second direction D2. In this embodiment, the cross-sectional shape of the anti-reflection microstructure 100 is substantially wavy or mountain-shaped, that is, the light-receiving area 101 and the backlight. Zones 102 are all curved surfaces.

In addition, a first angle θ1 is formed between a tangent plane passing through an arbitrary point of the light receiving region 101 and a vertical reference plane P1 passing through the vertex 100C, and a tangent plane passing through any point of the backlight region 102 and a vertical reference plane P1 passing through the vertex 100C form a The second angle is, and the first angle is greater than the second angle. Accordingly, when the light beam is projected to the light receiving region 101, it is ensured that the incident angle of the light beam is smaller than the total reflection critical angle of the light guiding element 10 to prevent the light beam from being totally reflected.

In other embodiments, the anti-reflection microstructures 100 can also be other types of eccentric cones, such as eccentric polygonal cones, that is, the bottom cross-sectional shape of the anti-reflection microstructures 100 is triangular, quadrangular, or other polygonal shape. The presently-created embodiment does not limit the shape of the anti-reflection microstructure 100 as long as it can reduce the proportion of the total reflection of the light beam (or increase the proportion of the light beam that passes through the light exit portion E2).

Please refer to Figure 1 again. The image taking device 1 of the present embodiment further includes a light transmitting member 11. The light transmissive element 11 is disposed on the first side S1 of the light guiding element 10 and has an outer surface 110 that is in contact with the environmental medium and that is opposite to the light element 10. If the image capturing device 1 is used in an optical fingerprinting system for capturing fingerprints and/or vein images, the outer surface 110 of the light transmitting member 11 can be touched or pressed by a finger for detection and identification.

The material of the light transmissive element 11 may be the same as the material of the light guiding element 10 and have similar refractive indices. According to this, when the light beam is transmitted from the light guiding element 10 to the light transmitting element 11, refraction of the light beam can be prevented. In an embodiment, the material of the light transmissive element 11 may be selected from the group consisting of glass, polymethymethacrylate (PMMA) or polycarbonate (PC) or other suitable materials. In addition, the light transmissive element 11 can be disposed on the light guiding element 10 by using a suitable optical glue (not shown) or other fixing means. In the present case, the light transmissive element may be an OLED display panel or an OLED display panel with a touch layer, and the structure thereof can be referred to the applicant's U.S. Patent No. 62/533,632, the patent name is biological sensing. The relevant part of the context of the device. It should be understood that the outer surface of the OLED display panel with the touch layer has a protective layer, and further, it is not limited to the display being rigid or Flexible panels are described here.

The image capturing device 1 further includes a substrate 14 on the second side of the light guiding element 10, a light emitting element 13 and an image capturing element 12, wherein the light emitting element 13 and the image capturing element 12 are both disposed on the substrate 14. The substrate 14 can be a circuit board that already has pre-configured lines. In addition, the material of the substrate 14 is a light absorbing material.

The image capturing component 12 is disposed on the substrate 14 corresponding to the plurality of antireflection microstructures 100 of the light guiding component 10 for capturing an image of the object F. In other words, the light guiding element 10 is located between the image capturing element 12 and the light transmitting element 11.

The image capturing element 12 has a light receiving surface 120 for receiving the light beam L emitted by the light exiting portion E2 of the light guiding element 10. In other words, after the light beam passes through the plurality of anti-reflection microstructures 100, it is projected onto the light-receiving surface 120 of the image capturing element 12. The image capturing element 12 is, for example, a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). However, in other embodiments, the image capture component 12 can also use other image sensors.

The light-emitting element 13 is disposed on the substrate 14 adjacent to the light-input portion E1 of the light-guiding element 10 for generating a light beam L transmitted in the light guiding element 10. In the present embodiment, the light-emitting element 13 is disposed outside the light-guiding element 10, and the light beam L generated by the light-emitting element 13 is projected to a light-injecting portion E1 of the light-guiding element 10. The light beam L generated by the light-emitting element 13 may be visible light or infrared light, and the light-emitting element 13 may be a light-emitting diode or other suitable light-emitting element, and the creation is not limited.

Further, the second side S2 of the light guiding element 10 of the present embodiment further has a first recess C1 for accommodating the light emitting element 13 and a second recess C2 for accommodating the image capturing element 12. The light incident portion E1 of the light guiding element 10 is located at the first recess portion C1, and the light exit portion E2 of the light guiding element 10 is located at the second recess portion C2.

As shown in FIG. 1, when the light-emitting element, the light-guiding element 10, and the image capturing element 12 are all disposed on the substrate 14, the light-emitting element 13 can be accommodated and clamped in the first recess C1, and the image is captured. Element 12 is just accommodating and is stuck in the Two recesses inside C2. In addition, in the present embodiment, the plurality of anti-reflection microstructures 100 are located at the bottom of the second recessed portion C2. In this way, the overall volume of the image taking device 1 can be reduced. However, in other embodiments, the first recess C1 and the second recess C2 may also be omitted. In another embodiment, the light emitting element 13 may be embedded within the light guiding element 10. Specifically, after the light-emitting element 13 is fixed on the substrate 14 , the light-guiding element 10 is formed by a step of potting and curing, and the light-emitting element 13 is embedded in the light-guiding element 10 . At this time, the light beam L generated by the light-emitting element 13 is directly transmitted through the light guiding element 10 without passing through other medium.

In addition, the light-emitting elements 13 of the present embodiment are disposed on the second side S2 of the light-guiding element 10, but in other embodiments, the light-emitting elements 13 may also be disposed on the first side S1 of the light-guiding element 10. .

In addition, the image taking device 1 of the present embodiment further includes a first reflective element 15 and a second reflective element 16. The first reflective element 15 and the second reflective element 16 are disposed on the first side S1 and the second side S2 of the light guiding element 10, respectively. Specifically, the first reflective element 15 is located between the light transmissive element 11 and the light guiding element 10 , and the second reflective element 16 is located between the substrate 14 and the light guiding element 10 . In an embodiment, the first reflective element 15 and the second reflective element 16 may be a reflective sheet or a reflective film layer formed on the surface of the light guiding element 10, which is not limited in the present invention.

In addition, in the present embodiment, the first reflective element 15 and the second reflective element 16 may be disposed offset from each other and at least partially overlapped in the thickness direction of the light guiding element 10 to guide the light beam L to the light transmitting element 11 . In other embodiments, the first reflective element 15 and the second reflective element 16 may also be completely staggered without overlapping. Therefore, the present invention does not limit the relative position of the first reflective element 15 and the second reflective element 16 or the form in which the light beam L is reflected as long as the light beam L can be guided to the light transmitting element 11.

For example, in other embodiments, the light beam L can also be totally reflected between the light guiding element 10 and the environmental medium by designing the direction of travel of the light beam L. In this case, the second reflective element 16 can be omitted.

In general, after the light beam L generated by the light-emitting element 13 enters the light-guiding element 10 from the light-input portion E1, the reflection of the first reflective element 15 and the reflection of the second reflective element 16 are sequentially performed, and the light-guiding element 10 is The inwardly transmissive element 11 is transferred, and at the interface of the light transmissive element 11 with the environmental medium, that is, the outer surface 110 of the light transmissive element 11, total reflection occurs.

When the object F (eg, a finger) contacts the outer surface 110 of the light transmissive element 11, the convex line of the finger contacts the outer surface 110, so that a part of the light beam L cannot generate total reflection, so that the image capturing element 12 obtains a corresponding finger convex. Dark lines of grain. On the other hand, the concave of the finger does not contact the outer surface 110 of the light transmitting member 11, but the other partial light beam L can still be totally reflected to form a signal light beam L'. The signal light beam L' is projected toward the light exit portion E2 of the light guiding element 10, and is directed to the light receiving surface 120 of the image capturing element 12 through the plurality of antireflection microstructures 100 of the light guiding element 10. Subsequently, an image processing component is used to perform image processing on the signal beam L' received by the image capturing component 12 to obtain a fingerprint image of the object F.

That is to say, in the present embodiment, by providing the anti-reflection microstructure 100 in the light-emitting portion E2 of the light guiding element 10, it is possible to prevent the signal light beam L' from being totally totally reflected before entering the image capturing element 12, thereby reducing the taking. Image recognition of the image device 1.

Please refer to FIG. 6. FIG. 6 is a cross-sectional view of the image capturing apparatus according to another embodiment of the present invention. The same or corresponding elements of the image capturing device 1 of FIG. 6 and the image capturing device 1 of FIG. 1 have the same reference numerals, and the same portions will not be described again.

In the embodiment of Fig. 6, the image taking device 1 further comprises a third reflective element 17 on the second side S2 of the light guiding element 10. That is, the second reflective element 16 and the third reflective element 17 are located on the same side of the light guiding element 10, but are spaced apart from each other. In the present embodiment, the light beam L is reflected by the first reflective element 15, the second reflective element 16, and the third reflective element 17 to be transmitted within the light guiding element 10 and projected to the light transmitting element 11.

In the present embodiment, the first reflective element 15 and the second reflective element 16 are completely overlapped in the thickness direction of the light guiding element 10, and the first reflective element 15 and the third opposite element The radiation elements 17 are only partially overlapped in the thickness direction of the light guiding element 10.

In addition, the image taking device 1 of the embodiment further includes a light absorbing element 18 disposed between the second reflective element 16 and the third reflective element 17. In the present embodiment, the light absorbing element 18 and the first reflective element 15 overlap in the thickness direction of the light guiding element 10. Further, the vertical projection of the first reflective element 15 can at least partially overlap the light absorbing element 18.

In other embodiments, the light absorbing element 18 may also be disposed in other regions of the light guiding element 10, that is, regions where the first reflective element 15, the second reflective element 16, and the third reflective element 17 are not disposed. For example, the image capturing device 1 may further include a plurality of light absorbing elements 18 disposed on opposite side wall surfaces of the light guiding element 10, wherein the side wall surface refers to the first side S1 and the first side connected to the light guiding element 10. The surface between the two sides S2. The light absorbing element 18 may be an opaque layer that is opaque to the light beam L and is non-reflective, such as an ink layer or an adhesive layer, or a masking sheet, but the foregoing illustrations are not intended to limit the scope of the present invention.

The light absorbing element 18 can absorb and reduce stray light that does not follow the predetermined optical path, thereby preventing the image capturing element 12 from receiving stray light from the signal light beam L'. In addition, the arrangement of the light absorbing element 18 can increase the image taking area and make the signal light beam L' transmitted to the image capturing element 12 more uniform, which is advantageous for improving the image quality.

Please refer to FIG. 7. FIG. 7 is a schematic cross-sectional view of the image taking device according to another embodiment of the present invention. The same or corresponding elements of the image capturing device 1 of FIG. 7 and the image capturing device 1 of FIG. 6 have the same reference numerals, and the same portions will not be described again.

In the embodiment of Fig. 7, the image taking device 1 further comprises a fourth reflective element 19 on the first side S1 of the light guiding element 10. That is, the first reflective element 15 and the fourth reflective element 19 are located on the same side of the light guiding element 10, but are disposed apart from each other. In the present embodiment, the light beam L is sequentially reflected by the first reflective element 15, the second reflective element 16, the fourth reflective element 19, and the third reflective element 17 to be transmitted and projected in the light guiding element 10. To the light transmissive element 11.

In the embodiment, the first reflective element 15 and the second reflective element 16 are guided by light. The element 10 at least partially overlaps in the thickness direction, and the fourth reflective element 19 and the third reflective element 17 also partially overlap in the thickness direction of the light guiding element 10. However, the first reflective element 15 and the third reflective element 17 do not overlap at all in the thickness direction of the light guiding element 10.

In addition, the image capturing device 1 of the present embodiment further includes a first reflective component 15 and a third reflective component in addition to a light absorbing component 18a disposed between the second reflective component 16 and the third reflective component 17. Another light absorbing element 18b between 17. In the present embodiment, the two light absorbing elements 18a, 18b and the first reflective element 15 at least partially overlap in the thickness direction of the light guiding element 10.

Similar to the embodiment of Fig. 6, the two light absorbing elements 18a, 18b can absorb and reduce stray light that does not follow the predetermined optical path, thereby preventing the image capturing element 12 from receiving stray light from the signal beam L'. In addition, the arrangement of the light absorbing element 18 can increase the image taking area and make the signal light beam L' transmitted to the image capturing element 12 more uniform, which is advantageous for improving the image quality.

In addition, in the embodiment, the image capturing apparatus 1 further includes a stopper 20 disposed in the first recessed portion C1. The stop 20 is located between the light-emitting element 13 and the image capturing element 12 to prevent the light beam L from being directly projected onto the image capturing element 12. On the other hand, the stopper 20 can limit the divergence angle of the light beam L generated by the light-emitting element 13, so that the light beam L can be more accurately controlled to enter the light guiding element 10 at a predetermined incident angle. In this way, the optical path of the light beam L can be further precisely controlled, and it is ensured that most of the light beam L can be projected toward the object F, and the image quality of the image capturing element 12 is improved.

Please refer to FIG. 8. FIG. 8 is a schematic cross-sectional view of the image capturing apparatus according to still another embodiment of the present invention. The same or corresponding elements of the image capturing device 1 of FIG. 8 and the image capturing device 1 of FIG. 6 have the same reference numerals, and the same portions will not be described again.

In the embodiment of FIG. 8, light directing element 10 includes a plurality of optical microstructures 103 disposed between second reflective element 16 and third reflective element 17. In the present embodiment, the range in which the plurality of optical microstructures 103 are distributed and the first reflective element 15 at least partially overlap in the thickness direction of the light guiding element 10. Further, the first reflective element 15 The vertical projection can at least partially overlap the extent of the distribution of the plurality of optical microstructures 103.

The shape of each of the optical microstructures 103 can be the same as the aforementioned anti-reflection microstructures 100. For example, the cross-sectional shape of the optical microstructure 103 may also be zigzag, wavy or mountain shape, but the present invention is not limited thereto.

The plurality of optical microstructures 103 may cause a portion of the light beam reflected by the first reflective element 15 to pass through the plurality of optical microstructures 103 to be projected from the light guiding element 10. Further, the stray light L1 that does not travel according to the predetermined path can be projected by the optical microstructure 103 to the outside of the light guiding element 10 and absorbed by the substrate 14, thereby preventing the image capturing element 12 from receiving the signal light beam L'. The stray light L1. In addition, the configuration of the optical microstructures 103 can increase the image taking area and make the signal beam L' transmitted to the image capturing element 12 more uniform, which is advantageous for improving the image quality.

In addition, similar to the embodiment of FIG. 7, in the embodiment of FIG. 8, the image capturing device 1 further includes a stopper 20 disposed in the first recess C1 to prevent the light beam L from being directly projected to the image capturing member. 12, and the divergence angle of the light beam L generated by the light-emitting element 13 can be limited, so that the light beam L can be more accurately controlled to enter the light guiding element 10 at a predetermined incident angle.

Please continue to refer to FIG. 9. FIG. 9 is a cross-sectional view of the image taking device according to still another embodiment of the present invention. The same or corresponding elements of the image capturing device 1 of FIG. 9 and the image capturing device 1 of FIG. 7 have the same or similar reference numerals, and the same portions will not be described again.

In the embodiment of FIG. 9, the image capturing device 1 includes light absorbing elements 18 disposed on the first reflective element 15 and the fourth reflective element 19, and the light guiding element 10 includes a second reflective element 16 and a third reflective element. A plurality of optical microstructures 103 between 17.

In the present embodiment, the range in which the plurality of optical microstructures 103 are distributed and the first reflective element 15 and the fourth reflective element 19 do not overlap at all in the thickness direction of the light guiding element 10. Further, the light absorbing element 18 and the second reflective element 16 at least partially overlap in the thickness direction of the light guiding element 10, but the light absorbing element 18 and the third reflecting element do not overlap at all in the thickness direction of the light guiding element 10.

The light absorbing element 18 and the optical microstructure 103 of the present embodiment can be made unscheduled The stray light L1 traveling through the path is emitted from the light guiding element 10, is absorbed by the substrate 14, or is directly absorbed by the light absorbing element 18, thereby preventing the image capturing element 12 from receiving stray light from the signal light beam L'. In addition, the arrangement of the light absorbing element 18 and the optical microstructures 103 can increase the image taking area and make the signal light beam L' transmitted to the image capturing element 12 more uniform, which is advantageous for improving the image quality.

Please refer to FIG. 10. FIG. 10 is a cross-sectional view of the image capturing apparatus according to still another embodiment of the present invention. The same or corresponding elements of the image capturing device 1' of Fig. 10 and the image capturing device 1 of Fig. 1 have the same or similar reference numerals, and the same portions will not be described again.

In the present embodiment, the image pickup device 1' omits the light transmitting member 11 as shown in Fig. 1. Accordingly, after the light beam L generated by the light-emitting element 13 enters the light-guiding element 10 by the light-input portion E1, it is sequentially reflected by the first reflective element 15 and reflected by the second reflective element 16 in the light-guiding element 10. The transfer, and at the interface of the light guiding element 10 with the environmental medium, that is to say on the surface of the first side S1 of the light guiding element 10, produces total reflection.

That is, the surface on the first side S1 of the light guiding element 10 can serve as a contact surface that is contacted by the object F. When the object F (eg, a finger) is in contact with the light guiding element 10 by the first side S1 of the light guiding element 10, the convexity of the finger causes a part of the light beam L to be unable to generate total reflection, so that the image capturing element 12 obtains the corresponding finger convex. Dark lines of grain. On the other hand, the concave of the finger does not contact the surface of the first side S1 of the light guiding element 10, but the other partial light beam L can still be totally reflected to form a signal light beam L'. The signal light beam L' is projected toward the light exit portion E2 of the light guiding element 10, and is directed to the light receiving surface 120 of the image capturing element 12 through the plurality of antireflection microstructures 100 of the light guiding element 10. Then, through the image processing component, the signal beam L' received by the image capturing component 12 is subjected to image processing, and the fingerprint image of the object F can be obtained and the identity recognition can be performed according to the fingerprint image.

Figure 11 is a cross-sectional view showing the image taking device of still another embodiment of the present invention. The same or corresponding elements of the image capturing device 1" of the present example and the image capturing device 1' of Fig. 10 have the same or similar reference numerals, and the same portions will not be described again.

In the present embodiment, the second side S2 of the light guiding element 10 does not have the first recessed portion C1 and the second recessed portion C2. That is, the light guiding element 10 is planar on the surface of the second side S2, but the plurality of antireflection microstructures 100 are still disposed on the light exiting portion E2 located on the second side S2.

In addition, the image capturing device 1 ′ of the embodiment further includes an optical glue G1. The optical glue G1 is connected between the light guiding element 10 and the substrate 14 to fix the light guiding element 10 on the substrate 14 , and the light emitting element 13 and the image The capturing element 12 is embedded in the optical glue G1. In addition, the refractive index of the optical glue G1 may be substantially the same as that of the light guiding element 10, for example, may be greater than or equal to 1.4 and less than or equal to 1.6. Therefore, the light beam L is from the light guiding element. When 10 enters the optical glue G1 or enters the light guiding element 10 by the optical glue G1, it advances according to a predetermined optical path without causing refraction.

It should be noted that the optical glue G1 does not fill the gap defined between the image capturing element 12 and the light exiting portion E2 (the plurality of anti-reflecting microstructures 100). Therefore, by the plurality of anti-transmission microstructures 100 provided in the light-emitting portion E2, the probability that the signal light beam L' is again totally reflected by the light-emitting portion E2 can be greatly reduced, thereby improving the image quality of the image capturing element 12.

In addition, in the embodiment, the light guiding element 10 is located on the surface of the first side S1 of the light guiding element 10 and has another recessed portion C3, and the position of the recessed portion C3 is corresponding to the position of the first reflective element 15 to reduce the guide. The partial thickness of the light element 10 facilitates providing a thinner image capture device for different products.

[Advantageous Effects of Embodiments]

One of the beneficial effects of the present invention is that the image capturing device 1 provided by the present invention can pass the "light guiding element 10 has a plurality of antireflection microstructures 100 located in the light exit portion E2" and the "image capturing element 12 corresponds to The plurality of anti-reflection microstructures 100 are disposed on the second side S2 ′ of the light guiding element 10 to prevent the signal beam L′ from being totally reflected again before entering the image capturing component 12 , thereby improving the image of the image capturing device 1 . Further, in the image capturing apparatus 1 of the present embodiment, since a plurality of anti-transmission microstructures 100 are disposed in the light-emitting portion E2 of the light guiding element 10, signal light can be avoided. The beam L' is again totally reflected, thus allowing the optical glue to be unfilled between the substrate 14 and the light guiding element 10. Therefore, in addition to further avoiding the problem that the optical glue contains fine bubbles or incomplete curing, the light beam is scattered, and the cost can be further reduced.

For an embodiment (such as the image capturing device 1) that needs to apply the optical glue G1 to be filled between the light guiding element 10 and the substrate 14, even if the image capturing element 12 and the light exiting portion E2 are not filled with the optical glue G1, by the plurality of anti-transmission microstructures 100 provided in the light-emitting portion E2, the probability that the signal light beam L' is again totally reflected by the light-emitting portion E2 can be greatly reduced, thereby improving the image quality of the image capturing element 12.

On the other hand, by providing at least one of the light absorbing element 18 or the optical microstructure 103 on the first side S1 or the second side S2 of the light guiding element 10, the stray light received by the image capturing element 12 can be reduced. L1, and the imaging area can be increased to make the signal beam L' transmitted to the image capturing element 12 more uniform, which is advantageous for improving the imaging quality of the image capturing apparatus 1.

The above disclosure is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, any equivalent technical changes made by using the present specification and the content of the schema are included in the application for this creation. Within the scope of the patent.

Claims (20)

An image capturing device comprising: a light guiding element having a first side and a second side, wherein the light guiding element has a light exiting portion on the second side, and the light emitting part is provided a plurality of antireflection microstructures; an image capture element disposed on the second side of the light guiding element corresponding to the plurality of the antireflection microstructures; and a light emitting element for generating a a light beam transmitted within the light guiding element; wherein the light beam forms at least one total reflection in the light guiding element to form a signal beam directed to a plurality of the antireflection microstructures, and the signal beam A plurality of the anti-reflection microstructures are passed through to the image capture element. The image capturing device of claim 1, further comprising a light transmissive element disposed on the first side of the light guiding element, and the light beam is guided by the light guiding element and the light transmitting element, And forming the signal beam by total reflection of an outer surface of the light transmissive element. The image capturing device of claim 1, wherein the light guiding element has a total reflection critical angle, and each of the antireflection microstructures comprises an incident angle of the signal beam that is smaller than the total reflection critical angle a light receiving area and a backlight area for causing an incident angle of the signal beam to be greater than a critical angle of the total reflection, and an area of the light receiving area is larger than an area of the backlight area. The image capturing device of claim 3, wherein each of the antireflection microstructures is an asymmetric protrusion, the asymmetric protrusion has a ridge line, the light receiving area and a vertical line passing through the ridge line A first angle is formed between the reference surfaces, the backlight region and the vertical reference surface form a second angle, and the first angle is greater than the second angle. The image capturing device of claim 4, wherein the light receiving area and the backlight area are respectively located on opposite sides of the vertical reference surface. The image capturing device of claim 3, wherein the plurality of antireflection microstructures are arranged in an array, and each of the antireflection microstructures is an eccentric microlens, the eccentric microlens having a vertex Forming a first angle between a cut surface of any point of the light receiving area and a vertical reference surface passing through the vertex, and forming a second angle by the cut surface of any point of the backlight area and the vertical reference surface, and The first angle is greater than the second angle. The image capturing device of claim 3, wherein the light receiving area of each of the antireflection microstructures and the backlight area are an inclined plane or a curved surface. The image capturing device of claim 1, wherein the plurality of the antireflection microstructures are connected to each other, and the cross-sectional shape of the antireflection microstructure is a mountain shape, a wave shape or a zigzag shape. The image capturing device of claim 1, further comprising: a first reflective element disposed on the first side and a second reflective element disposed on the second side, wherein the light beam is sequentially The reflection of the first reflective element and the second reflective element is performed within the light guiding element. The image taking device of claim 9, wherein the first reflective element and the second reflective element at least partially overlap in a thickness direction of the light guiding element. The image capturing device of claim 10, further comprising: a third reflective element disposed on the second side, the second reflective element and the third reflective element being spaced apart from each other, the light beam passing Reflection of the first reflective element, the second reflective element, and the third reflective element to enter the light guiding element Line pass. The image capturing device of claim 11, further comprising: a light absorbing element disposed between the second reflective element and the third reflective element, wherein the first reflective element and the second The reflective elements at least partially overlap in the thickness direction of the light guiding elements. The image capturing device of claim 12, further comprising: a fourth reflective element disposed on the first side, the first reflective element and the fourth reflective element being spaced apart from each other, the light beam passing Reflections of the first reflective element, the second reflective element, the third reflective element, and the fourth reflective element are transmitted within the light directing element. The image capturing device of claim 13, further comprising: another light absorbing element disposed between the first reflective element and the fourth reflective element, and the two light absorbing elements are at the light guiding The elements overlap at least partially in the thickness direction. The image capturing device of claim 11, wherein the light guiding element further comprises a plurality of optical microstructures between the second reflective element and the third reflective element to enable passage of the first A portion of the light beam after reflection by a reflective element is projected from the light directing element through a plurality of the optical microstructures. The image capturing device of claim 15, further comprising: a fourth reflective element disposed on the first side, the first reflective element and the fourth reflective element being spaced apart from each other, the light beam passing Reflections of the first reflective element, the second reflective element, the third reflective element, and the fourth reflective element are transmitted within the light directing element. The image capturing apparatus of claim 16, further comprising: a setting in the a light absorbing element between the first reflective element and the fourth reflective element, and the region of the light absorbing element and the plurality of optical microstructures at least partially overlap in a thickness direction of the light guiding element. The image capturing device of claim 1, further comprising: a substrate, wherein the light emitting element, the light guiding element, and the image capturing element are all disposed on the substrate, and the light guiding element is in the The second side has a first recess for receiving the light emitting element and a second recess for receiving the image capturing element, and the plurality of the antireflection microstructures are located at the second The surface of the recess. The image capturing device of claim 18, further comprising a stopper disposed in the first recess, wherein the stopper is located between the light emitting element and the image capturing component to avoid The beam is projected directly onto the image capture element. The image capturing device of claim 1, further comprising: a substrate, the light emitting element, the light guiding element and the image capturing element are all disposed on the substrate; and an optical glue connected Between the substrate and the light guiding element, the light guiding element is fixed on the substrate, wherein the light emitting element and the image capturing element are embedded in the optical glue, and A gap is defined between the light portion and the image capturing element.