Light supplementing device of iris instrument

Abstract

The utility model discloses a light supplementing device of an iris instrument. The light supplementing device comprises a light source, an outer lens cone and an inner lens cone, the light source is arranged on the back face of a camera of the iris instrument, the inner lens cone is arranged on the peripheral side of the camera, the light source, the camera and the inner lens cone are all arranged in the outer lens cone, and the opening direction of the outer lens cone is consistent with the shooting direction of the camera; according to the device, the light source is arranged on the back of the camera, the outer lens cone is arranged outside the camera, the inner lens cone is arranged inside the camera to wrap the camera, light emitted by the light source is reflected by the inner wall of the outer lens cone and the outer wall of the inner lens cone to finally form light rays at a certain angle to enter eyeball irises, and therefore high-brightness light spots can be avoided; therefore, the image collected by the camera is free of light spots, and the accuracy and efficiency of eyeball iris information collection by the iris instrument are improved.

Description

Technical Field

[0001] This utility model relates to the field of iris scanners, and in particular to a supplementary lighting device for an iris scanner. Background Technology

[0002] Traditional iris scanners have a camera coaxial with the eyeball. The iris is part of the eyeball, and one or more light sources on the side provide supplemental lighting. The light source and the optical axis are at a certain angle. Light is emitted from the light source, reflected by the eyeball, and then enters the camera. See details. Figure 1 However, during use, it was found that because the lens of the eye is a highly reflective object, the light from the light source is always uneven, with the brightest areas appearing as bright spots on the captured iris image. To solve this problem with traditional iris scanners, multiple photos are often taken, the light source is turned on sequentially, and the multiple photos are then combined in post-processing. However, this combination also introduces certain errors and can lead to inaccurate autofocus. Therefore, there is an urgent need to provide a supplementary lighting device for iris scanners to solve the above problems. Summary of the Invention

[0003] Therefore, there is a need for an iris scanner supplementary lighting device with a simple structure that can effectively avoid the generation of bright light spots.

[0004] To achieve the above objectives, the inventors provide a supplementary lighting device for an iris scanner, comprising: a light source, an outer lens tube, and an inner lens tube;

[0005] The light source is located on the back of the iris scanner's camera, the inner endoscope is located around the camera, and the light source, camera, and inner endoscope are all located inside the outer endoscope. The opening direction of the outer endoscope is consistent with the shooting direction of the camera.

[0006] As a preferred structure of this utility model, the outer lens tube includes a cylindrical lens tube arranged coaxially with the light source, and a trapezoidal stage lens tube, a parabolic lens tube, or a flared lens tube connected to the cylindrical lens tube. The cylindrical lens tube is located around the light source and the camera, and the trapezoidal stage lens tube, parabolic lens tube, or flared lens tube is the bottom of the cylindrical lens tube.

[0007] As a preferred structure of this utility model, it also includes a convex lens. The outer lens tube includes a cylindrical lens tube and a parabolic lens tube arranged coaxially with the light source. The cylindrical lens tube is located around the light source and the camera. The parabolic lens tube is the bottom of the cylindrical lens tube. The convex lens is located at the opening of the cylindrical lens tube.

[0008] As a preferred structure of this utility model, the light source is located at the focal point of the parabolic lens barrel, the focal point of the convex lens is located behind the lens of the eye, and a through hole is provided at the axis of the convex lens.

[0009] As a preferred structure of this utility model, the two sides of the endoscope tube are arranged parallel to the two sides of the cylindrical endoscope tube.

[0010] As a preferred structure of this utility model, the convex lens is a double-sided convex lens, a single-sided convex lens, or a Fresnel lens.

[0011] As a preferred structure of this utility model, the outer lens tube is an ellipsoidal lens tube arranged coaxially with the light source, the light source is located at the left focal point of the ellipsoidal lens tube, and the lens of the eye is located between the right focal point of the ellipsoidal lens tube and the camera, and close to the right focal point.

[0012] As a preferred structure of this utility model, the light source is fixedly disposed at the bottom of the inner wall of the outer lens barrel.

[0013] As a preferred structure of this utility model, a planar support is provided on the inner side of the outer lens tube. The planar support coincides with the optical axis of the light source. One end of the planar support is connected to the outer lens tube, and the other end is connected to the inner lens tube and the camera, respectively.

[0014] As a preferred structure of this utility model, it also includes a moving mechanism, which is located on the outside of the outer lens barrel. A sliding groove is provided on the side wall of the outer lens barrel, and a planar support extending into the outer lens barrel is provided in the sliding groove. The planar support coincides with the optical axis of the light source. One end of the planar support is connected to the moving mechanism, and the other end is connected to the inner lens barrel and the camera respectively.

[0015] As a preferred structure of this utility model, it also includes a moving mechanism, which is located on the outside of the outer lens tube and connected to the outer lens tube. A planar support is provided on the inside of the outer lens tube. The planar support coincides with the optical axis of the light source. One end of the planar support is connected to the outer lens tube, and the other end is connected to the inner lens tube and the camera, respectively.

[0016] As a preferred structure of this utility model, it also includes an outer sleeve, which is sleeved on the outside of the outer lens tube, and the fixed end of the moving mechanism is connected to the outer sleeve.

[0017] Unlike existing technologies, the above-mentioned technical solution achieves the following beneficial effects: This device sets up a light source behind the camera, with an outer lens tube on the outside and an inner lens tube inside to enclose the camera. The light emitted by the light source is reflected by the inner wall of the outer lens tube and the outer wall of the inner lens tube, ultimately forming a certain angle of light that enters the iris of the eye. This effectively avoids the generation of bright spots, making the image captured by the camera free of spots, and effectively improving the accuracy and efficiency of the iris scanner in collecting information from the iris of the eye. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the traditional iris scanner used in the background technology to collect images of the iris structure of the eyeball;

[0019] Figure 2 This is a schematic diagram of the trapezoidal stage mirror tube structure described in a specific embodiment;

[0020] Figure 3 Schematic diagram of the parabolic mirror tube structure described in the specific embodiment Figure 1 ;

[0021] Figure 4 Schematic diagram of the parabolic mirror tube structure described in the specific embodiment Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the ellipsoidal mirror tube structure described in a specific embodiment;

[0023] Figure 6 Schematic diagram of the light source mounting structure for a specific implementation. Figure 1 ;

[0024] Figure 7 Schematic diagram of the light source mounting structure for a specific implementation. Figure 2 ;

[0025] Figure 8 Schematic diagram of the planar support connection structure described in the specific embodiment Figure 1 ;

[0026] Figure 9 Schematic diagram of the planar support connection structure described in the specific embodiment Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the lead screw motor connection structure described in a specific embodiment. Figure 1 ;

[0028] Figure 11 This is a schematic diagram of the lead screw motor connection structure described in a specific embodiment. Figure 2 ;

[0029] Figure 12 This is a schematic diagram of the outer sleeve connection structure described in a specific embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Eyeball; 2. Light source; 3. Outer tube; 301. Cylindrical tube; 302. Trapezoidal stage tube; 303. Parabolic tube; 304. Ellipsoidal tube; 4. Inner tube; 5. Camera; 501. Data cable; 6. Convex lens; 601. Through hole; 7. Planar support; 8. Lead screw motor; 9. Outer sleeve. Detailed Implementation

[0032] To explain in detail the technical content, structural features, objectives, and effects of the technical solution, the following description is provided in conjunction with specific embodiments and accompanying drawings.

[0033] like Figures 2 to 8 As shown, this embodiment provides a supplementary lighting device for an iris scanner, including: a light source 2, an outer lens tube 3, and an inner lens tube 4; the light source 2 is located on the back of the iris scanner's camera 5, and the inner lens tube 4 is located around the camera 5. The light source 2, camera 5, and inner lens tube 4 are all located inside the outer lens tube 3, and the opening direction of the outer lens tube 3 is consistent with the shooting direction of the camera 5. This embodiment sets up a light source on the back of the camera, with an outer lens tube on the outside and an inner lens tube inside to enclose the camera. The light emitted by the light source is reflected by the inner wall of the outer lens tube and the outer wall of the inner lens tube, ultimately forming a certain angle of light that enters the iris of the eye. This effectively avoids the generation of bright spots, making the image captured by the camera free of spots, and effectively improving the accuracy and efficiency of the iris scanner in collecting information from the iris of the eye.

[0034] like Figure 2 As shown, in this embodiment, the outer lens tube 3 includes a cylindrical lens tube 301 and a trapezoidal stage lens tube 302 arranged coaxially with the light source. The cylindrical lens tube 301 is located around the light source and the camera, and the trapezoidal stage lens tube 302 is the bottom of the cylindrical lens tube 301. In this embodiment, a light source 2 is used and is located on the back of the camera 5. There is an outer lens tube 3, which is composed of a cylindrical lens tube 301 and a trapezoidal stage lens tube 302. Inside, there is an inner lens tube 4 (enclosing the camera 5). The light emitted by the light source 2 is reflected by the inner walls of the cylindrical lens tube 301 and the trapezoidal stage lens tube 302 and the outer wall of the inner lens tube 4, and finally forms a certain angle of light that enters the iris of the eyeball 1. Of course, in different embodiments, such as Figure 3 As shown, the trapezoidal stage tube can also be replaced by a parabolic tube or a flared tube, which can achieve the same good results.

[0035] like Figure 4 As shown, in some embodiments, the supplementary lighting device of this iris scanner further includes a convex lens 6. The outer lens tube includes a cylindrical lens tube 301 and a parabolic lens tube 303 arranged coaxially with the light source. The cylindrical lens tube 301 is located around the light source and the camera, and the parabolic lens tube 303 is the bottom of the cylindrical lens tube 301. The convex lens 6 is located at the opening of the cylindrical lens tube. In this embodiment, the bottom of the outer lens tube uses a combination of a parabolic surface and a cylindrical surface. A convex lens is added to the opening of the outer lens tube. The light source is located at the focal point of the parabolic surface, and the focal point of the convex lens is located behind the lens. A through hole 601 is hollowed out in the middle of the convex lens. The light emitted by the light source forms a straight line parallel to the lens tube after passing through the parabolic surface, and converges after passing through the convex lens to provide supplementary lighting for the iris scanner. The iris reflects the light and enters the camera for imaging through the through hole 601 of the convex lens. The convex lens 6 can be a double-sided convex lens, a single-sided convex lens, or a Fresnel lens. Figure 3 As shown, in different embodiments, when using a parabolic lens barrel, a convex lens may not be required, and the same good effect can be achieved.

[0036] like Figure 5 As shown, in different embodiments, the outer lens tube 3 is an ellipsoidal lens tube 304 coaxial with the light source. The light source is located at the left focal point of the ellipsoidal lens tube 304, and the lens of the eye is located between the right focal point of the ellipsoidal lens tube 304 and the camera, close to the right focal point. Specifically: the inner wall of the outer lens tube is a semi-ellipsoidal surface, the light source is located at the left focal point of the ellipsoidal surface, and the iris of the eye being photographed is located between the right focal point and the camera, close to the right focal point. The light source is emitted from the left focal point, reflected by the ellipsoidal surface, and converges to the right focal point, forming a certain angle to supplement the iris light, and finally reflected into the camera.

[0037] In the above embodiments, the light source 2 can be an LED light source or a halogen lamp, etc., and its installation position only needs to be behind the camera. The camera can also be an autofocus (AF) lens or a fixed-focus (FF) lens.

[0038] like Figure 6 and Figure 7 As shown, the light source can also be fixed at the bottom of the inner wall of the outer lens barrel, forming a cavity between it and the camera.

[0039] like Figure 8 and Figure 9 As shown, a planar support 7 is provided inside the outer lens barrel. The planar support 7 coincides with the optical axis of the light source 2. One end of the planar support 7 is connected to the outer lens barrel, and the other end is connected to the inner lens barrel and the camera, respectively. In this embodiment, the surface of the camera's data cable 501, the structure of the planar support 7 that fixes the camera's inner lens barrel, and the optical axis are aligned as much as possible. This can minimize the obstruction of the light source and reduce the size of the shadow.

[0040] like Figure 10 As shown, in some embodiments, a moving mechanism is also included. In this embodiment, the moving mechanism is a lead screw motor 8, which is located outside the outer endoscope tube 3. A sliding groove (not shown in the figure) is provided on the side wall of the outer endoscope tube 3. A planar support 7 extending into the outer endoscope tube is provided in the sliding groove. The planar support coincides with the optical axis of the light source. One end of the planar support 7 is connected to the lead screw motor 8, and the other end is connected to the endoscope tube and the camera, respectively. By setting the lead screw motor 8, the movement and adjustment of the endoscope tube and the camera are realized, so that the camera of the iris scanner can be located in the most appropriate position when acquiring images, that is, with good lighting and no light spots.

[0041] like Figure 11As shown, in some embodiments, a moving mechanism is also included. In this embodiment, the moving mechanism is a lead screw motor 8, which is located outside the outer lens barrel 3 and connected to it. A planar support 7 is provided inside the outer lens barrel, and the planar support 7 coincides with the optical axis of the light source. One end of the planar support 7 is connected to the outer lens barrel, and the other end is connected to the inner lens barrel and the camera, respectively. That is, the entire assembly of the outer lens barrel, inner lens barrel, and camera is moved by the lead screw motor 8.

[0042] In the above Figure 10 and Figure 11 In both embodiments, this is to adapt to different object distances. Because the distance between the eyeball and the camera is not fixed during shooting, automatic adjustment of the object distance (for fixed focus) or automatic focusing (for zoom) is needed to ensure clear images. In the above embodiments, the moving mechanism can also be moved by a motor-driven gear, rack, or other similar means. Figure 12 As shown, the device also includes an outer sleeve, which is fitted over the outer side of the outer lens tube. The fixed end of the moving mechanism is connected to the outer sleeve, allowing the outer lens tube to move axially within the outer sleeve under the action of the moving mechanism.

[0043] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of patent protection for this utility model.

Claims

1. A supplementary lighting device for an iris scanner, characterized in that, include: Light source, outer tube, and inner tube; The light source is located on the back of the iris scanner's camera, the inner endoscope is located around the camera, and the light source, camera, and inner endoscope are all located inside the outer endoscope. The opening direction of the outer endoscope is consistent with the shooting direction of the camera.

2. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: The outer lens tube includes a cylindrical lens tube arranged coaxially with the light source, and a trapezoidal stage lens tube, a parabolic lens tube, or a flared lens tube connected to the cylindrical lens tube. The cylindrical lens tube is located around the light source and the camera, and the trapezoidal stage lens tube, parabolic lens tube, or flared lens tube is the bottom of the cylindrical lens tube.

3. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: It also includes a convex lens. The outer lens tube includes a cylindrical lens tube and a parabolic lens tube arranged coaxially with the light source. The cylindrical lens tube is located around the light source and the camera. The parabolic lens tube is the bottom of the cylindrical lens tube. The convex lens is located at the opening of the cylindrical lens tube.

4. The supplementary lighting device for an iris scanner according to claim 3, characterized in that: The light source is located at the focal point of the parabolic lens barrel, the focal point of the convex lens is located behind the lens of the eye, and a through hole is provided at the axis of the convex lens.

5. The supplementary lighting device for an iris scanner according to claim 3, characterized in that: The two sides of the endoscope tube are arranged parallel to the two sides of the cylindrical endoscope tube.

6. The supplementary lighting device for an iris scanner according to claim 3, characterized in that: The convex lens is a double-sided convex lens, a single-sided convex lens, or a Fresnel lens.

7. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: The outer lens tube is an ellipsoidal lens tube arranged coaxially with the light source. The light source is located at the left focal point of the ellipsoidal lens tube, and the eye lens is located between the right focal point of the ellipsoidal lens tube and the camera, and close to the right focal point.

8. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: The light source is fixedly located at the bottom of the inner wall of the outer lens barrel.

9. The supplementary lighting device for an iris scanner according to any one of claims 1 to 8, characterized in that: The outer lens tube is provided with a planar support inside. The planar support is aligned with the optical axis of the light source. One end of the planar support is connected to the outer lens tube, and the other end is connected to the inner lens tube and the camera, respectively.

10. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: It also includes a moving mechanism located on the outside of the outer endoscope tube. A sliding groove is provided on the side wall of the outer endoscope tube, and a planar support extending into the outer endoscope tube is provided in the sliding groove. The planar support is aligned with the optical axis of the light source. One end of the planar support is connected to the moving mechanism, and the other end is connected to the inner endoscope tube and the camera, respectively.

11. The supplementary lighting device for an iris scanner according to claim 1, characterized in that: It also includes a moving mechanism located on the outside of the outer lens tube and connected to the outer lens tube. A planar support is provided on the inside of the outer lens tube. The planar support is aligned with the optical axis of the light source. One end of the planar support is connected to the outer lens tube, and the other end is connected to the inner lens tube and the camera, respectively.

12. The supplementary lighting device for an iris scanner according to claim 10 or 11, characterized in that: It also includes an outer sleeve, which is fitted onto the outside of the outer lens tube, and the fixed end of the moving mechanism is connected to the outer sleeve.

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