Image acquisition device

Abstract

This application provides an image acquisition device, which includes a mounting bracket, a camera, a light source, and a light guide. The mounting bracket has a receiving hole and a light guide groove, with the light guide groove surrounding the receiving hole. The first opening of the receiving hole and the second opening of the light guide groove face the same side of the mounting bracket. The camera is disposed in the receiving hole, with its lens facing the first opening. The light source is disposed in the light guide groove, with its light source facing the second opening. The light guide is disposed around the camera, opposite to the light source, and blocks the second opening. The image acquisition device of this application captures better images and has higher working efficiency.

Description

Technical Field

[0001] This application relates to the field of smart terminal technology, and in particular to an image acquisition device. Background Technology

[0002] Image acquisition devices are commonly used in daily life. They can capture images and convert them into digital signals. However, existing image acquisition devices often produce images of poor quality and have low efficiency. Utility Model Content

[0003] This application provides an image acquisition device that can solve the problems of poor image quality and low work efficiency in image acquisition devices.

[0004] The technical solution is as follows:

[0005] An image acquisition device includes a mounting bracket, a camera, a light source, and a light guide. The mounting bracket has a receiving hole and a light guide groove, the light guide groove being arranged around the receiving hole, and a first opening of the receiving hole and a second opening of the light guide groove facing the same side of the mounting bracket. The camera is disposed in the receiving hole, with the camera lens facing the first opening. The light source is disposed in the light guide groove, with the light source facing the second opening. The light guide is arranged around the camera, opposite to the light source, and blocks the second opening.

[0006] The beneficial effects of the technical solution provided in this application include at least the following:

[0007] In this embodiment, when the camera of the image acquisition device captures an image, the light source is turned on. The light from the light source passes through the light guide and illuminates the target object. The light guide controls the path of the light, allowing the light to illuminate the target object evenly. This results in better brightness on the target object, which improves the image quality captured by the camera. It also facilitates the conversion of the image into a digital signal by the image acquisition device, thereby improving the working efficiency of the image acquisition device. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a three-dimensional structural diagram of an image acquisition device provided in one embodiment of this application.

[0010] Figure 2 yes Figure 1A three-dimensional exploded view of the image acquisition device.

[0011] Figure 3 yes Figure 1 One of the cross-sectional views of the image acquisition device in the image.

[0012] Figure 4 yes Figure 3 The image acquisition device in the image is magnified at point A.

[0013] Figure 5 yes Figure 1 This is a simulation of the light spot formed when the light source of the image acquisition device illuminates the target object.

[0014] Figure 6 yes Figure 5 The grayscale curve of one of the light spots in the image.

[0015] Figure 7 yes Figure 5 Another grayscale curve of the light spot in the image.

[0016] Figure 8 yes Figure 1 Another simulation image showing the light spot formed by the light source of the image acquisition device shining on the target object.

[0017] Figure 9 yes Figure 8 The grayscale curve of one of the light spots in the image.

[0018] Figure 10 yes Figure 8 Another grayscale curve of the light spot in the image.

[0019] Figure 11 yes Figure 1 Another simulation image showing the light spot formed by the light source of the image acquisition device shining on the target object.

[0020] Figure 12 yes Figure 11 The grayscale curve of one of the light spots in the image.

[0021] Figure 13 yes Figure 11 Another grayscale curve of the light spot in the image.

[0022] Figure 14 yes Figure 1 Another simulation image showing the light spot formed by the light source of the image acquisition device shining on the target object.

[0023] Figure 15 yes Figure 14 The grayscale curve of one of the light spots in the image.

[0024] Figure 16 yes Figure 14 Another grayscale curve of the light spot in the image. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," etc., indicate directions based on the appendix. Figure 1 The orientations shown are for the purpose of facilitating and simplifying the description of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0027] Please refer to Figure 1 , Figure 2 and Figure 3 This application provides an image acquisition device 100, which includes a mounting frame 30, a camera 40, a light-emitting lamp 50, and a light guide 60. The mounting frame 30 has a receiving hole 31 and a light guide groove 32. The light guide groove 32 surrounds the receiving hole 31, and the first opening 311 of the receiving hole 31 and the second opening 321 of the light guide groove 32 face the same side of the mounting frame 30. The camera 40 is disposed in the receiving hole 31, and the lens 41 of the camera 40 faces the first opening 311. The light-emitting lamp 50 is disposed in the light guide groove 32, and the light-emitting lamp 50 faces the second opening 321. The light guide 60 is disposed around the camera 40, opposite to the light-emitting lamp 50, and blocks the second opening 321. In this embodiment, the light guide 60 is embedded in the light guide groove 32 to block the second opening 321. In other embodiments, the light guide 60 may not be embedded in the light guide groove 32, and the light guide 60 may be stacked on the surface of the mounting frame 30 away from the light-emitting lamp 50.

[0028] In this embodiment, when the camera 40 of the image acquisition device 100 acquires an image, the light source 50 is turned on. The light from the light source 50 passes through the light guide 60 and illuminates the target object. The light guide 60 can control the path of the light, so that the light can be evenly illuminated on the target object, resulting in better brightness of the target object. This improves the image quality acquired by the camera 40, facilitates the conversion of the image into a digital signal by the image acquisition device 100, and thus improves the working efficiency of the image acquisition device 100.

[0029] In some embodiments, the image acquisition device 100 further includes a housing 10, a cover plate 20, and a circuit board 70. The housing 10 has a mounting cavity 11, with an opening on one side. The mounting bracket 30, camera 40, light-emitting lamp 50, light guide 60, and circuit board 70 are all disposed within the mounting cavity 11. The mounting bracket 30 is connected to the housing 10, and the first opening 311 of the receiving hole 31 and the second opening 321 of the light guide groove 32 both face the opening of the mounting cavity 11.

[0030] Circuit board 70 is connected to the side of mounting bracket 30 away from the second opening 321. Camera 40 is electrically connected to circuit board 70, and is disposed in receiving hole 31, with lens 41 facing the opening of mounting cavity 11. Light lamp 50 is disposed in light guide groove 32, facing the opening of mounting cavity 11. Cover plate 20 is connected to housing 10, and covers the opening of mounting cavity 11. Cover plate 20 is opposite to light guide 60 and camera 40, and the area of ​​cover plate 20 facing the first opening 311 and second opening 321 is transparent. In this embodiment, cover plate 20 is made of transparent glass, and the entire cover plate 20 is transparent.

[0031] For example, in this embodiment, the image acquisition device 100 is a palm-scanning device, and the target acquisition object is the palm print of the user's hand. The camera 40 is used to acquire the palm print of the user's hand. When the user performs the palm scan, the user places their palm above the cover plate 20, and the camera 40 can capture the user's palm print. During the capture process, the light source 50 is turned on, and the light from the light source 50 passes through the light guide 60 and illuminates the user's palm. The light guide 60 is a microprism film, which can control the path of the light so that the light can be concentrated in the user's palm area, resulting in better brightness in the user's palm area. This improves the effect of the palm print captured by the camera 40, helps the image acquisition device 100 to recognize the user's palm print, and thus improves the palm-scanning efficiency of the image acquisition device 100. In other embodiments, the image acquisition device 100 can also be a scanner or an industrial camera, etc.

[0032] In some embodiments, the outer casing 10 is rectangular and includes a first surface 12 and a second surface 13 disposed opposite to each other, with the first surface 12 inclined relative to the second surface 13. A mounting cavity 11 is disposed on the first surface 12, and a plurality of fixing posts 111 are provided on the bottom surface of the mounting cavity 11, with the plurality of fixing posts 111 arranged in a rectangular pattern.

[0033] The mounting bracket 30 includes a first isolation ring 33, a second isolation ring 34, a connecting portion 35, and a support portion 36. The first isolation ring 33 surrounds the circumference of the camera 40 to form a receiving hole 31. The second isolation ring 34 surrounds the circumference of the first isolation ring 33, and the second isolation ring 34 is spaced apart from the first isolation ring 33, forming a light guide groove 32 between the second isolation ring 34 and the first isolation ring 33. The connecting portion 35 connects the side of the first isolation ring 33 away from the light guide member 60 and the side of the second isolation ring 34 away from the light guide member 60. The connecting portion 35 surrounds the circumference of the camera 40. The connecting portion 35 is plate-shaped and has multiple through holes 351. The multiple through holes 351 penetrate the connecting portion 35 along its thickness direction and are evenly spaced in a circle along the circumference of the light guide groove 32. The support portion 36 is plate-shaped and is fixedly connected to the end of the outer circumference of the second isolation ring 34 away from the connecting portion 35. The support portion 36 surrounds the second isolation ring 34 in a circumferential manner.

[0034] In this embodiment, the circuit board 70 is stacked on one side of the thickness direction of multiple fixing posts 111, and the circuit board 70 is threadedly connected to the multiple fixing posts 111. The circuit board 70 is also connected to the side of the connecting portion 35 opposite to the first isolation ring 33. The connecting portion 35 of the mounting bracket 30 is stacked with the circuit board 70, saving space and facilitating miniaturization. The support portion 36 is fixedly connected to the outer shell 10, and the surface of the support portion 36 opposite to the connecting portion 35 is flush with the first surface 12. The cover plate 20 is fixedly stacked on the first surface 12 and the support portion 36 by means including but not limited to welding, bonding, or threaded connection.

[0035] The camera 40 is disposed on the side of the circuit board 70 away from the fixing post 111 and is electrically connected to the circuit board 70. The end of the camera 40 away from the lens 41 is stacked with the circuit board 70. The entire camera 40 is located inside the receiving hole 31. The lens 41 of the camera 40 faces the cover plate 20. The camera 40 can capture images of the outside of the image acquisition device 100 through the cover plate 20.

[0036] Multiple LEDs 50 are arranged in a circle around the camera 40. One end of each LED 50 is located on the side of the circuit board 70 away from the fixing post 111 and is electrically connected to the circuit board 70. The other end of each LED 50 passes through the connecting part 35 and protrudes out of the light guide groove 32. Specifically, each LED 50 is housed in multiple through holes 351, with the ends of each LED 50 away from the circuit board 70 correspondingly protruding from the through holes 351 and housed within the light guide groove 32. The connecting part 35 protects the LEDs, which helps improve the product's lifespan. In other embodiments, the number of LEDs 50 can also be one, and the LED 50 can be configured as a ring light, covering the entire light guide groove 32.

[0037] The light guide 60 is located at the end of the light guide groove 32 away from the light-emitting lamp 50. The light guide 60 is fixedly connected to the cover plate 20 on the surface away from the light-emitting lamp 50 by means including but not limited to adhesive bonding. In other words, the light guide 60 and the cover plate 20 are stacked, saving space and facilitating miniaturization. The light guide 60 closes the second opening 321 of the light guide groove 32. In this embodiment, the distance between the light guide 60 and the light-emitting lamp 50 is 13mm. The distance between the light guide 60 and the light-emitting lamp 50 is related to the number of light-emitting lamps 50 and the diameter of the circle formed by the multiple light-emitting lamps 50. The more light-emitting lamps 50 there are and the smaller the diameter of the circle formed by the multiple light-emitting lamps 50, the smaller the distance between the light guide 60 and the light-emitting lamp 50. Conversely, the fewer light-emitting lamps there are and the larger the diameter of the circle formed by the multiple light-emitting lamps 50, the larger the distance between the light guide 60 and the light-emitting lamp 50.

[0038] In this embodiment, by setting a first isolation ring 33, the light source 50 and the camera 40 can be isolated, preventing the light from the light source 50 from shining into the receiving hole 31 and affecting the shooting of the camera 40. By setting a second isolation ring 34, the second isolation ring 34 and the first isolation ring 33 form a light guide groove 32, and the light from the light source 50 can be focused in the light guide groove 32, preventing the light from scattering, so that the light source 50 can provide better illumination when the image acquisition device 100 is working.

[0039] In this embodiment, the outer shell 10 and the cover plate 20 can protect the components inside the mounting cavity 11. In other embodiments, the outer shell 10 and the cover plate 20 can be omitted, and the light guide 60 is fixedly connected to the mounting frame 30.

[0040] Please refer to Figure 4 In some embodiments, the light guide 60 is a microprism film. The light guide 60 includes a substrate 61 and a plurality of protrusions 62. The substrate 61 blocks the second opening 321 of the light guide groove 32, and the substrate 61 closes the second opening 321. The plurality of protrusions 62 are disposed on the side of the substrate 61 facing the light-emitting lamp 50, and the plurality of protrusions 62 are evenly spaced. For example, the substrate 61 is made of a polymer material such as polyester (PET), which has good flexibility, transparency and mechanical strength, and can provide stable support for the plurality of protrusions 62, ensuring that the plurality of protrusions 62 maintain the stability of their shape and position during use. The plurality of protrusions 62 are respectively a plurality of tiny prisms, the size of which ranges from 10-300um. The prisms are mainly attached and transferred to the film in batches by photoresist imprinting.

[0041] The protrusions 62 are in the shape of triangular pyramids or other shapes. Multiple protrusions 62 are arranged in a regular array with close and uniform intervals to form a continuous, highly ordered microstructure surface. When light shines on the light guide 60, it is refracted and reflected at the interface between the protrusions 62 and the air. By precisely designing the shape, angle, and arrangement of the protrusions 62, the direction of light propagation can be controlled, so that the light shines evenly on the user's palm area, improving the brightness of the palm area and thus improving the effect of the palm print captured by the camera 40. This is beneficial for the image acquisition device 100 to recognize the user's palm print, thereby improving the palm scanning efficiency of the image acquisition device 100.

[0042] Please refer to Figure 5 In some embodiments, the light from the lamp 50 passes through the light guide 60 and the cover plate 20 and illuminates a target object outside the image acquisition device 100 to form a light spot on the target object. The distance between the target object and the light guide 60 is a first preset value. The light spot includes a central area A and an annular area B, with the annular area B surrounding the central area A. The brightness of the central area A is less than the brightness of the annular area B, and the brightness of the central area A gradually decreases from the side closer to the annular area B towards the center; the brightness of the annular area B first gradually increases and then gradually decreases from the side closer to the central area A towards the side farther from the central area A. Figure 5 This is a simulation of the light spot formed when the light from the illuminator 50 shines on the target object at a preset height of 3cm. It's important to understand that in actual use, when a user places their palm at a height of 3cm from the light guide 60, the light spot formed when the illuminator 50 shines on the palm will be different from... Figure 5 The displayed light spot effect is the same.

[0043] Figure 6 This is the grayscale curve of the light spot when the first preset value is 3cm. Figure 6 The horizontal axis in the middle represents Figure 5 The image shows the horizontal position of the light spot. A value of 0 on the horizontal axis represents the center of the light spot, negative values ​​represent the area to the left of the center, and positive values ​​represent the area to the right of the center. The vertical axis represents the brightness of the light spot at the corresponding position. Figure 5 and Figure 6 It can be seen that the brightness of the area to the left of the light spot is the same as that of the area to the right of the light spot. The areas to the left and right of the light spot are symmetrical.

[0044] Figure 7 This is another grayscale curve of the light spot when the first preset value is 3cm. Figure 7 The vertical axis in the diagram represents Figure 5The vertical axis represents the position of the light spot. A value of 0 on the vertical axis indicates the center of the light spot; negative values ​​indicate the area above the center; and positive values ​​indicate the area below the center. The horizontal axis represents the brightness of the light spot at the corresponding position. Figure 5 and Figure 7 It can be seen that the brightness of the area above the light spot is the same as the brightness of the area below the light spot. The areas above and below the light spot are symmetrical.

[0045] In some embodiments, please refer to Figure 8 The distance between the target object and the light guide 60 is greater than or equal to a second preset value. The brightness of the light spot gradually decreases from the center to the edge. Figure 8 This is a simulation of the light spot formed when the light from lamp 50 illuminates the target object at a preset distance of 5cm. Figure 8 It can be concluded that the brightness gradually decreases from the center to the edge of the light spot.

[0046] Figure 9 This is the grayscale curve of the light spot when the second preset value is 5cm. Figure 9 The horizontal axis in the middle represents Figure 8 The image shows the horizontal position of the light spot. A value of 0 on the horizontal axis represents the center of the light spot, negative values ​​represent the area to the left of the center, and positive values ​​represent the area to the right of the center. The vertical axis represents the brightness of the light spot at the corresponding position. Figure 8 and Figure 9 It can be seen that the brightness of the area to the left of the light spot is the same as that of the area to the right of the light spot. The areas to the left and right of the light spot are symmetrical.

[0047] Figure 10 This is another grayscale curve of the light spot when the second preset value is 5cm. Figure 10 The vertical axis in the diagram represents Figure 8 The vertical axis represents the position of the light spot. A value of 0 on the vertical axis indicates the center of the light spot; negative values ​​indicate the area above the center; and positive values ​​indicate the area below the center. The horizontal axis represents the brightness of the light spot at the corresponding position. Figure 8 and Figure 10 It can be concluded that the brightness of the upper region of the light spot is the same as the brightness of the lower region of the light spot. The upper region of the light spot and the lower region of the light spot are symmetrical.

[0048] Figure 11 This is a simulation of the light spot formed when the light from lamp 50 illuminates the target object at a preset distance of 8cm. Figure 11 It can be concluded that the brightness gradually decreases from the center to the edge of the light spot. Figure 12 The grayscale curve of the light spot when the second preset value is 8cm is shown. Figure 12 The horizontal axis in the middle represents Figure 11 The image shows the horizontal position of the light spot. A value of 0 on the horizontal axis represents the center of the light spot, negative values ​​represent the area to the left of the center, and positive values ​​represent the area to the right of the center. The vertical axis represents the brightness of the light spot at the corresponding position. Figure 11 and Figure 12 It can be concluded that the brightness of the area to the left of the light spot is the same as the brightness of the area to the right of the light spot. The area to the left of the light spot and the area to the right of the light spot are symmetrical.

[0049] Figure 13 This is another grayscale curve of the light spot when the second preset value is 8cm. Figure 13 The vertical axis in the diagram represents Figure 11 The vertical axis represents the position of the light spot. A value of 0 on the vertical axis indicates the center of the light spot; negative values ​​indicate the area above the center; and positive values ​​indicate the area below the center. The horizontal axis represents the brightness of the light spot at the corresponding position. Figure 11 and Figure 13 It can be concluded that the brightness of the upper region of the light spot is the same as the brightness of the lower region of the light spot. The upper region of the light spot and the lower region of the light spot are symmetrical.

[0050] Figure 14 This is a simulation of the light spot formed when the light from lamp 50 illuminates the target object at a preset distance of 12cm. Figure 14 It can be concluded that the brightness gradually decreases from the center to the edge of the light spot. Figure 15 This is the grayscale curve of the light spot when the second preset value is 12cm. Figure 15 The horizontal axis in the middle represents Figure 14 The image shows the horizontal position of the light spot. A value of 0 on the horizontal axis represents the center of the light spot, negative values ​​represent the area to the left of the center, and positive values ​​represent the area to the right of the center. The vertical axis represents the brightness of the light spot at the corresponding position. Figure 14 and Figure 15 It can be concluded that the brightness of the area to the left of the light spot is the same as the brightness of the area to the right of the light spot. The area to the left of the light spot and the area to the right of the light spot are symmetrical.

[0051] Figure 16 This is another grayscale curve of the light spot when the second preset value is 12cm. Figure 16 The vertical axis in the diagram represents Figure 14 The vertical axis represents the position of the light spot. A value of 0 on the vertical axis indicates the center of the light spot; negative values ​​indicate the area above the center; and positive values ​​indicate the area below the center. The horizontal axis represents the brightness of the light spot at the corresponding position. Figure 14 and Figure 16It can be concluded that the brightness of the upper region of the light spot is the same as the brightness of the lower region of the light spot. The upper region of the light spot and the lower region of the light spot are symmetrical.

[0052] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An image acquisition device, characterized in that, The image acquisition device includes: Mounting bracket; the mounting bracket is provided with a receiving hole and a light guide groove, the light guide groove is arranged around the receiving hole, and the first opening of the receiving hole and the second opening of the light guide groove face the same side of the mounting bracket; A camera, wherein the camera is disposed in the receiving hole and the lens of the camera faces the first opening; A light source, wherein the light source is disposed in the light guide groove and faces the second opening; and A light guide is provided, which is arranged around the camera and is opposite to the light-emitting lamp, and blocks the second opening.

2. The image acquisition device according to claim 1, characterized in that, The mounting bracket includes a first isolation ring and a second isolation ring. The first isolation ring surrounds the circumference of the camera to form the receiving hole. The second isolation ring surrounds the circumference of the first isolation ring. The second isolation ring is spaced apart from the first isolation ring, and the light guide groove is formed between the second isolation ring and the first isolation ring.

3. The image acquisition device according to claim 2, characterized in that, The mounting bracket further includes a connecting part, which connects the side of the first isolation ring away from the light guide and the side of the second isolation ring away from the light guide; the connecting part surrounds the circumference of the camera. The image acquisition device further includes a circuit board connected to the side of the connecting portion away from the first isolation ring; one end of each of the plurality of light-emitting lamps is disposed on the circuit board and electrically connected to the circuit board, and the other end of each of the plurality of light-emitting lamps passes through the connecting portion and protrudes from the light guide groove; the camera is disposed on the circuit board and electrically connected to the circuit board.

4. The image acquisition device according to claim 3, characterized in that, The connecting part is provided with multiple through holes, which are evenly spaced along the light guide groove, and the multiple light-emitting lamps are respectively housed in the multiple through holes.

5. The image acquisition device according to claim 1, characterized in that, The image acquisition device also includes a housing and a cover plate. The housing has a mounting cavity, and the mounting bracket, the camera, the light-emitting lamp, and the light guide are all disposed inside the mounting cavity. The cover plate is connected to the outer shell and closes the opening of the mounting cavity; the area of ​​the cover plate facing the first opening and the second opening is made transparent.

6. The image acquisition device according to claim 5, characterized in that, The light guide is connected to the cover plate on the surface away from the light-emitting lamp.

7. The image acquisition device according to any one of claims 1 to 6, characterized in that, The light guide is a microprism film.

8. The image acquisition device according to any one of claims 1 to 6, characterized in that, The light guide includes a substrate and a plurality of protrusions. The substrate blocks the second opening of the light guide groove, and the plurality of protrusions are disposed on the side of the substrate facing the light-emitting lamp, and the plurality of protrusions are evenly spaced.

9. The image acquisition device according to any one of claims 1 to 6, characterized in that, The number of light-emitting lamps is multiple, and the multiple light-emitting lamps are arranged around the circumference of the camera.

10. The image acquisition device according to any one of claims 1 to 6, characterized in that, The light from the lamp passes through the light guide and illuminates the target object outside the image acquisition device to form a light spot on the target object; the distance between the target object and the light guide is a first preset value; the light spot includes a central area and a ring area, and the ring area surrounds the central area; The brightness of the central area is less than that of the annular area, and the brightness of the central area gradually decreases from the side closer to the annular area to the center; the brightness of the annular area first gradually increases and then gradually decreases from the side closer to the central area to the side farther from the central area.

11. The image acquisition device according to any one of claims 1 to 6, characterized in that, The light from the lamp passes through the light guide and illuminates the target object outside the image acquisition device to form a light spot on the target object; the distance between the target object and the light guide is greater than or equal to a second preset value. The brightness of the light spot gradually decreases from the center to the edge.

Images