Image capturing device integrated with multiple detectors

Abstract

The invention discloses an image capturing device integrating multiple detectors, which comprises a cover plate for protecting the device, the cover plate is transparent, the two sides of the lower part of the cover plate are respectively provided with a light source part and an image capturing part, and the light source part is isolated from the image capturing part through a first infrared filter; the light source part comprises an infrared light source and two reflectors, when a finger covers the cover plate, light emitted by the infrared light source is sequentially reflected by the two reflectors and finally enters the image taking part after being subjected to third reflection on the surface, and the image taking part completes the image taking process. The light source part and the image capturing part are separately arranged, the reflection angle of the light is adjusted, the propagation path of the light is effectively controlled, the utilization rate of the light is improved, later image capturing is facilitated, meanwhile, the sizes of light transmitting openings of different shading layers and the sizes of a plurality of detectors are modulated, and crosstalk in the phase forming process can be effectively solved.

Description

Technical Field

[0001] This invention application is a divisional application of an invention patent application with an application date of April 3, 2019, application number: 201910264337.6, and named “An imaging device with integrated multiple detectors”.

[0002] The present invention relates to the technical field of image capture, and in particular to an image capture device integrating multiple detectors. Background Art

[0003] Biometrics is a technology that relies on the biological characteristics of the human body to authenticate identity. The biological characteristics of the human body include face, iris, retina, palm print, etc. Since human characteristics cannot be copied, common passwords, smart cards, keys, etc. have many disadvantages such as loss, forgetting, copying and theft. Therefore, biometrics can replace personal passwords and passwords to prevent unauthorized access. Identification is currently the least intrusive to the human body, and it is convenient, practical and reliable. It is currently the most representative and promising technology. For detection, commonly used technical means include ultrasonic scanning, crystal sensing, optical scanning, etc. Optical imaging equipment has a long history, which can be traced back to the 1970s. Optical imaging equipment is based on the principle of total reflection of light (FTIR). Light shines on the glass surface pressed, and the reflected light is obtained by the optical detector. The amount of reflected light depends on the depth of the ridges and valleys pressed on the glass surface and the oil and moisture between the skin and the glass. When the light passes through the glass and hits the valley, it is totally reflected at the interface between the glass and the air. The light is reflected to the optical detector and received. However, the light that hits the ridge does not undergo total reflection, but is absorbed by the contact surface between the ridge and the glass or diffusely reflected to other places, thus forming an image on the optical detector.

[0004] In recent years, with the continuous improvement of optical imaging technology, the imaging devices designed using this method have been continuously improved. However, in the actual imaging process, the reflected light is easily scattered in the process of reflection in the device, and crosstalk problems occur, affecting the recognition results. At the same time, traditional imaging devices all use a photodetector to collect images. A single detector is prone to problems such as incomplete imaging or poor quality. Summary of the invention

[0005] The purpose of the present invention is to provide an imaging device with integrated multiple detectors. By separating the light source part and the imaging part, the reflection angle of the light is adjusted and the propagation path of the light is effectively controlled, which is beneficial to improving the utilization rate of light and facilitating the subsequent imaging. It solves the problem that traditional imaging devices all use one photoelectric detector to collect images, and a single detector is prone to incomplete imaging or poor quality.

[0006] According to an embodiment of the present invention, an imaging device with integrated multiple detectors includes a cover plate for protecting the device, the cover plate is transparent and has a light source part and an imaging part respectively arranged on both sides of the lower part, and the light source part and the imaging part are isolated from each other by a first infrared filter; the light source part includes an infrared light source and two reflectors, when a finger covers the cover plate, the light emitted by the infrared light source is reflected by the two reflectors in sequence, and finally enters the imaging part after the third reflection on the surface, and the imaging part completes the imaging process; the imaging part includes an imager and an image acquisition card, the imager is arranged in the imaging device and the output end is electrically connected to the image acquisition card through a wire.

[0007] Furthermore, the imager includes a first light-shielding layer, a first detector, a second light-shielding layer, and a second detector. A first light-transmitting port and a second light-transmitting port are respectively provided in the middle of the first light-shielding layer and the second light-shielding layer. A first detector is provided at the lower side of the first light-transmitting port, and a second detector is provided at the lower side of the second light-transmitting port.

[0008] Furthermore, the imager also includes a second infrared filter, and the second infrared filter is arranged under the first shading layer or the second shading layer.

[0009] Furthermore, the number of the first detector and the number of the second detector are one or two respectively.

[0010] Furthermore, the diameters of the first light-transmitting opening and the second light-transmitting opening are not completely the same.

[0011] Furthermore, the size of the first detector is smaller than the size of the first light-transmitting opening, the size of the second light-transmitting opening is equal to the size of the first light-transmitting opening, the size of the second detector is smaller than the size of the second light-transmitting opening, and two parallel second detectors are arranged under the second light-shielding layer.

[0012] Furthermore, the size of the first detector is larger than the size of the first light-transmitting opening, the size of the second light-transmitting opening is equal to the size of the first light-transmitting opening, the size of the second detector is larger than the size of the second light-transmitting opening, and two first detectors are arranged under the first light-shielding layer. The two detectors are placed side by side with a 0.2-1 cm long gap in the middle.

[0013] Furthermore, the size of the first detector is smaller than the size of the first light-transmitting opening, the size of the second light-transmitting opening is smaller than the size of the first light-transmitting opening, the size of the second detector is equal to the size of the second light-transmitting opening (11), and two first detectors are arranged below the first light-shielding layer, namely the first detector A and the first detector B. The first detector A and the first detector B are placed side by side, with a 0.2-1 cm long gap exposed in between.

[0014] Furthermore, the first detector and the second detector include a plurality of light sensing areas for receiving infrared light beams reflected by the object to be detected.

[0015] Furthermore, the light sensing area includes a charge coupled device and a complementary metal oxide semiconductor group. The charge coupled device and the complementary metal oxide semiconductor group both utilize photodiodes to perform photoelectric conversion to convert images into digital data.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By separating the light source part from the imaging part and adjusting the reflection angle of the light, the propagation path of the light can be effectively controlled, which is beneficial to improving the light utilization rate and facilitating subsequent imaging. At the same time, by adjusting the sizes of the light-transmitting ports of different shading layers and multiple detectors, the crosstalk during imaging can be effectively solved. The present invention is provided with two shading layers and multiple detectors to solve the problem of a single shading layer and a single sensor in traditional imaging devices. The multiple detectors are all connected to the image acquisition card and work together to improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached picture: Figure 1 This is a schematic structural diagram of an imaging device integrating multiple detectors proposed by the present invention.

[0019] Figure 2 It is a cross-sectional schematic diagram of Embodiment 1 of an imaging part in an imaging device with integrated multiple detectors proposed by the present invention.

[0020] Figure 3 It is a cross-sectional schematic diagram of Embodiment 2 of an imaging part in an imaging device with integrated multiple detectors proposed by the present invention.

[0021] Figure 4 It is a cross-sectional schematic diagram of Embodiment 3 of the imaging part of an imaging device with integrated multiple detectors proposed by the present invention.

[0022] Figure 5 It is a cross-sectional schematic diagram of embodiment 4 of the imaging part of an imaging device with integrated multiple detectors proposed by the present invention.

[0023] Figure 6 It is a cross-sectional schematic diagram of Embodiment 5 of the imaging part of an imaging device with integrated multiple detectors proposed by the present invention.

[0024] Figure 7 It is a cross-sectional schematic diagram of Example 6 of an imaging part in an imaging device with integrated multiple detectors proposed by the present invention.

[0025] Figure 8 It is a cross-sectional schematic diagram of Example 7 of the imaging part of an imaging device with integrated multiple detectors proposed by the present invention.

[0026] Fig. 9 It is a cross-sectional schematic diagram of Example 8 of an imaging part in an imaging device with integrated multiple detectors proposed by the present invention.

[0027] In the figure: 1-cover plate, 2-reflector, 3-infrared light source, 4-first infrared filter, 5-image finder, 6-image acquisition card, 7-first light shielding layer, 8-second light shielding layer, 9-second infrared filter, 10-first light transmission port, 11-second light transmission port, 12-first detector, 1201-first detector A, 1202-first detector B, 13-second detector, 1301-second detector A, 1302-second detector B. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0029] Reference Figure 1 , an imaging device with integrated multiple detectors, including a cover plate 1 for protecting the device, the cover plate 1 is transparent and has a light source part and an imaging part respectively arranged on both sides of the lower part, and the light source part and the imaging part are isolated by a first infrared filter 4; the light source part includes an infrared light source 3 and two reflectors 2, when a finger covers the cover plate 1, the light emitted by the infrared light source 3 is reflected by the two reflectors 2 in sequence, and finally enters the imaging part after the third reflection on the surface, and the imaging part completes the imaging process; the imaging part includes an imager 5 and an image acquisition card 6, the imager 5 is arranged in the imaging device and the output end is electrically connected to the image acquisition card 6 through a wire.

[0030] Reference Figure 2 , the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the size of the second light-transmitting port 11 is equal to the size of the first light-transmitting port 10, and the size of the second detector 13 is larger than the size of the second light-transmitting port 11. In this embodiment, the first light-shielding layer 7, the first detector 12, the second light-shielding layer 8, the second infrared filter 9, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10, is received by the first detector 12, and then passes through the second light-transmitting port 11 to continue to capture images. Example 2

[0031] Reference Figure 3 , the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the size of the second light-transmitting port 11 is equal to the size of the first light-transmitting port 10, the size of the second detector 13 is smaller than the size of the second light-transmitting port 11, and two parallel second detectors 13 are arranged below the second light-shielding layer 8. In this embodiment, the first light-shielding layer 7, the first detector 12, the second light-shielding layer 8, the second infrared filter 9, the second detector 13, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10, is received by the first detector 12, then passes through the second light-transmitting port 11, and reaches the two parallel second detectors 13 to continue to capture images.

[0032] The remaining technical features are the same as those of Example 1. Example 3

[0033] Referring to FIG4 , the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the size of the second light-transmitting port 11 is equal to the size of the first light-transmitting port 10, and the size of the second detector 13 is larger than the size of the second light-transmitting port 11. Two first detectors 12 are arranged below the first light-shielding layer 7, and the two detectors are placed side by side, with a 0.2-1 cm long gap in the middle. In this embodiment, the first light-shielding layer 7, the two first detectors 12, the second light-shielding layer 8, the second infrared filter 9, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10, then passes through the gap between the two first detectors 12 and the second light-transmitting port 11, and is continuously imaged by the second detector 13.

[0034] The remaining technical features are the same as those of Example 1. Example 4

[0035] 5 , the size of the first detector 12 is smaller than that of the first light-transmitting opening 10 , and two first detectors are arranged below the first light-shielding layer ( 7 ), and the two detectors 12 are placed side by side, with a gap of 0.2-1 cm in length exposed in between.

[0036] The size of the second light-transmitting port 11 is equal to the length of the gap between the two first detectors 12, and the size of the second detector 13 is equal to the length of the gap between the two first detectors, so as to facilitate continued imaging. In this embodiment, the first light-shielding layer 7, the second infrared filter 9, the two first detectors 12, the second light-shielding layer 8, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10 and is received by the two first detectors 12 respectively, and then passes through the gap between the two detectors and the second light-transmitting port 11 to continue imaging.

[0037] The remaining technical features are the same as those of Example 1. Example 5

[0038] Reference Figure 6, the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the size of the second light-transmitting port 11 is larger than the size of the first light-transmitting port 10, and the size of the second detector 13 is equal to the size of the second light-transmitting port 11. In this embodiment, the first light-shielding layer 7, the first detector 12, the second light-shielding layer 8, the second infrared filter 9, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10, is received by the first detector 12, and then passes through the second light-transmitting port 11 to continue to capture images.

[0039] The remaining technical features are the same as those of Example 1. Example 6

[0040] Reference Figure 7 , the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the size of the second light-transmitting port 11 is larger than the size of the first light-transmitting port 10, the size of the second detector is smaller than the size of the second light-transmitting port 11, and two second detectors are arranged under the second light-shielding layer 8, namely, the second detector A (1301) and the second detector B (1302). In this embodiment, the first light-shielding layer 7, the first detector 12, the second light-shielding layer 8, the second infrared filter 9, and the second detector are arranged from the cover plate downward. The reflected light passes through the first light-transmitting port 10, is received by the first detector 12, and then passes through the second light-transmitting port 11, and reaches the two parallel second detectors A1301 and the second detector B1302 to continue to capture images.

[0041] The remaining technical features are the same as those of Example 1. Example 7

[0042] Reference Figure 8 The size of the first detector is smaller than the size of the first light-transmitting opening 10, the size of the second light-transmitting opening 11 is smaller than the size of the first light-transmitting opening 10, the size of the second detector 13 is equal to the size of the second light-transmitting opening 11, and two first detectors are arranged below the first light-shielding layer (7), namely the first detector A (1201) and the first detector B (1202). The first detector A (1201) and the first detector B (1202) are placed side by side, with a gap of 0.2-1 cm in length exposed in the middle.

[0043] In this embodiment, the first light shielding layer 7, the first detector A1201 and the first detector B1202 arranged in parallel, the second light shielding layer 8, the second infrared filter 9, and the second detector 13 are arranged downward from the cover plate. The reflected light passes through the first light transmission port 10, and then passes through the gap between the first detector A1201 and the first detector B1202, the second light transmission port 11, and is continuously imaged by the second detector 13.

[0044] The remaining technical features are the same as those of Example 1. Example 8

[0045] Reference Fig. 9 , the size of the first detector 12 is smaller than the size of the first light-transmitting port 10, the first detector 12 is arranged under the first light-shielding layer 7, the size of the first detector 12 is smaller than the size of the second light-transmitting port 11, and two second detectors are arranged under the second light-shielding layer 8, namely, the second detector A (1301) and the second detector B (1302). In this embodiment, the first light-shielding layer 7, the second infrared filter 9, the first detector 12, the second light-shielding layer 8, and the two second detectors are arranged downward from the cover plate. The reflected light passes through the first light-transmitting port 10 and is received by the first detector 12 respectively, then passes through the gaps on both sides of the first detector 12 and the second light-transmitting port 11, and continues to be imaged by the two parallel second detectors A 1301 and the second detector B 1302.

[0046] The remaining technical features are the same as those of Example 1.

[0047] In summary of the above embodiments 1-8, the first detector 12 and the second detector 13 include multiple light sensing areas to receive the infrared light beam reflected by the object to be detected. The light sensing area includes a charge coupled device and a complementary metal oxide semiconductor group; the charge coupled device and the complementary metal oxide semiconductor group both use photodiodes for photoelectric conversion to convert images into digital data.

[0048] It should also be noted that the imaging parts in Examples 3 and 4 are arranged from top to bottom as follows: a first light-shielding layer 7, a first detector 12, a second light-shielding layer 8, a second infrared filter 9, and a second detector 13. In another embodiment, they are arranged from top to bottom as follows: a first light-shielding layer 7, a second infrared filter 9, a first detector 12, a second light-shielding layer 8, and a second detector 13. It can be seen that the second infrared filter 9 can be placed under each light-shielding layer to filter out impurity light. The arrangement of the second infrared filter 9 in the present invention is not limited to this.

[0049] In other embodiments of the present invention, the imaging part may include more than two light-shielding layers. Furthermore, each light-shielding layer may have multiple light-transmitting openings, and other detectors are arranged underneath to improve the imaging quality. In addition, multiple detectors are connected to the image acquisition card 6, which collects information and completes information exchange with the processor. Then, the processor completes the image analysis to achieve imaging.

[0050] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An imaging device integrating multiple detectors, characterized in that: Comprising a cover plate (1) for protecting the device, the cover plate (1) is transparent and has a light source portion and an imaging portion respectively arranged on two sides of the lower portion, and the light source portion and the imaging portion are separated by a first infrared filter (4); The light source part comprises an infrared light source (3) and two reflectors (2). When a finger covers the cover plate (1), the light emitted by the infrared light source (3) is reflected by the two reflectors (2) in sequence, and finally enters the imaging part after being reflected for the third time on the surface, and the imaging part completes the imaging process. The image capturing part comprises an image capture device (5) and an image capture card (6); the image capture device (5) is arranged in the image capturing device and an output end thereof is electrically connected to the image capture card (6) via a wire; The imager (5) comprises a first light shielding layer (7), a first detector (12), a second light shielding layer (8), and a second detector (13); a first light-transmitting opening (10) and a second light-transmitting opening (11) are respectively provided in the middle of the first light shielding layer (7) and the second light shielding layer (8); the first detector (12) is provided at the lower side of the first light-transmitting opening (10), and the second detector (13) is provided at the lower side of the second light-transmitting opening (11); The imaging part is arranged from top to bottom as follows: a first light shielding layer (7), a first detector (12), a second light shielding layer (8), and a second detector (13); The image finder (5) further comprises a second infrared filter (9), wherein the second infrared filter (9) is arranged at the lower part of the second light shielding layer (8); The size of the first detector (12) is smaller than the size of the first light-transmitting opening (10), the size of the second light-transmitting opening (11) is larger than the size of the first light-transmitting opening (10), the size of the second detector (13) is smaller than the size of the second light-transmitting opening (11), and two second detectors are arranged below the second light-shielding layer (8), namely a second detector A (1301) and a second detector B (1302). The second detector A (1301) and the second detector B (1302) are placed side by side, with a long gap in between that is smaller than the size of the first detector (12).

2. The imaging device integrating multiple detectors according to claim 1, characterized in that: The first detector (12) and the second detector (13) comprise a plurality of light sensing areas for receiving infrared light beams reflected by the object to be detected.

3. The imaging device integrating multiple detectors according to claim 2, characterized in that: The light sensing area includes a charge coupled device and a complementary metal oxide semiconductor group. The charge coupled device and the complementary metal oxide semiconductor group both utilize photodiodes to perform photoelectric conversion to convert images into digital data.

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