Imaging device
By using a combination of lenses with a specific arrangement and curvature design in the lens, aberration problems in near-object imaging are solved, achieving high-resolution and high-definition imaging effects.
Patent Information
- Application Number
- CN202423019515.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-06
AI Technical Summary
In existing technologies, lenses are prone to introducing aberrations when imaging close to objects, resulting in reduced image sharpness.
By employing a combination of plano-convex lenses, biconcave lenses, and biconvex lenses arranged sequentially at intervals along the first direction within the lens, and by controlling the curvature of the lenses and setting structures such as aperture stops and spacers, aberrations are reduced.
It achieves high-definition imaging at close range, improving image clarity, especially the imaging effect at the ocular surface.
Smart Images
Figure CN223539065U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of camera module technology, and more particularly to an imaging device. Background Technology
[0002] With the widespread adoption of smart products, cameras are no longer limited to mobile phones. They are increasingly used in smart homes, drones, smart security cameras, facial recognition, and other applications. Furthermore, cameras are used in industrial, medical, construction, and military fields. When imaging objects at close range, the photographer can adjust the lens focal length or focus to achieve a sharp and clear image.
[0003] In existing technologies, when shooting near objects, the lens uses multiple lenses to diverge or focus light. However, the process of the lenses diverging or focusing light can easily introduce spherical aberration, resulting in aberrations during imaging, reducing the clarity of the image and affecting the imaging effect. Utility Model Content
[0004] The purpose of this application is to provide an imaging device that reduces aberrations during near-object imaging, improves imaging clarity, and enhances imaging effects.
[0005] The imaging device provided in this application includes: a lens; within the lens, a plano-convex lens, a biconcave lens, and a biconvex lens are arranged sequentially at intervals along a first direction; wherein, the side of the plano-convex lens facing away from the biconcave lens is an outwardly convex curved surface and is used to face the object being photographed, the side of the plano-convex lens facing the biconcave lens is a flat surface, the two opposing sides of the biconcave lens are both inwardly concave curved surfaces and the curvature of the side facing the plano-convex lens is less than the curvature of the side of the biconcave lens facing the biconvex lens, and the two opposing sides of the biconvex lens are both outwardly convex curved surfaces and the side facing away from the biconcave lens is used to face the image plane.
[0006] Optionally, the lens further includes a lens barrel, and the plano-convex lens, the biconcave lens, and the biconvex lens are all disposed within the lens barrel; the lens barrel is also provided with an aperture stop disposed along a first direction between the plano-convex lens and the biconcave lens, and a spacer disposed along the first direction between the biconcave lens and the biconvex lens.
[0007] Optionally, the aperture stop is provided with a first blocking ring extending towards the center on the side near the biconcave lens, and the spacer is provided with a second blocking ring on the side near the biconcave lens.
[0008] Optionally, the end face of the first shielding ring facing away from the biconcave lens is a first inclined surface, and the end face of the second shielding ring facing away from the biconcave lens is a second inclined surface.
[0009] Optionally, the imaging device further includes a camera, the camera including a housing and a photosensitive part located within the housing, the photosensitive part including a photosensitive chip and a circuit board connected in circuit, the photosensitive chip being located in the light propagation path.
[0010] Optionally, the camera also includes a filter unit, which includes a filter and a filter base for mounting the filter. The filter base has a filter port. The filter, the filter port, and the photosensitive chip are arranged opposite to each other. The filter base is positioned inside the housing.
[0011] Optionally, the filtering part further includes a filter bracket, on which at least two filters are arranged vertically in sequence. The filter base has a slot for sliding the filter bracket and a control component for controlling the movement of the filter bracket, so as to control the required filter to move to be positioned opposite to the filter port, and the filter port is located in the slot.
[0012] Optionally, the control component includes a motor and a rocker arm connected to the drive. The filter bracket is also provided with a transverse opening. The rocker arm is provided with a bent section, which is limited to the transverse opening. When the rocker arm swings under the drive of the motor, it drives the filter bracket to slide in the slot to switch the filter.
[0013] Optionally, a flat lens is also mounted on the lens or the camera, the flat lens being located between the biconvex lens and the image plane.
[0014] Optionally, a light-transmitting hole is provided on the side of the housing facing the lens, and the flat lens is mounted on the light-transmitting hole.
[0015] The above technical solution has the following beneficial effects:
[0016] The imaging device provided in this application uses a plano-convex lens and a biconcave lens to initially focus external light, followed by a further convergence through the biconvex lens. This allows for a smooth transition of external light onto the image plane over a shorter distance, reducing the difficulty of aberration correction and achieving high-definition imaging at close object distances. The curvature difference between the two surfaces of the biconcave lens allows the larger curved surface facing the plano-convex lens to correct a significant amount of positive spherical aberration introduced by the plano-convex lens (compensating for negative spherical aberration), while the smaller curved surface facing away from the plano-convex lens corrects some spherical aberration and also corrects coma introduced by the preceding system. By controlling the curvature of these lenses, various aberrations are reduced, improving image sharpness. When the object being photographed is the ocular surface, the position of the ocular surface can be conjugated onto the image plane, increasing the image sharpness of the ocular surface. Attached Figure Description
[0017] Figure 1This is a path diagram of light within the lens in one embodiment of this application.
[0018] Figure 2 This is a path diagram of multiple beams within the lens in one embodiment of this application.
[0019] Figure 3 This is a longitudinal sectional view of the lens in one embodiment of this application.
[0020] Figure 4 This is a schematic diagram of the camera structure in one embodiment of this application.
[0021] Figure 5 This is a lateral sectional view of a camera in one embodiment of this application.
[0022] Figure 6 This is an exploded view of a camera in one embodiment of this application.
[0023] Figure 7 This is a schematic diagram of the structure of the photosensitive part in one embodiment of this application.
[0024] Figure 8 This is a schematic diagram of the structure of the filter bracket installed in the housing in one embodiment of this application.
[0025] Figure 9 This is an exploded view of the filter bracket and filter base in one embodiment of this application.
[0026] Attached icon number
[0027] 1-Lens, 10-Planar-convex lens, 11-Biconcave lens, 12-Biconvex lens, 13-Lens barrel, 14-Aperture stop, 140-First blocking ring, 141-First inclined surface, 15-Spacer ring, 150-Second blocking ring, 151-Second inclined surface.
[0028] 2-Image plane.
[0029] 3-Camera, 30-House, 300-Light-transmitting hole, 31-Photosensitive part, 310-Photosensitive chip, 311-Circuit board, 32-Filter part, 320-Filter, 321-Filter base, 322-Filter port, 323-Filter bracket, 324-Horizontal opening, 325-Slot, 326-Joystick, 327-Bent section, 33-Flat lens. Detailed Implementation
[0030] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0031] It is readily understood that, based on the technical solution of this utility model, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.
[0032] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.
[0033] The imaging device provided in this application includes: a lens 1, wherein a plano-convex lens 10, a biconcave lens 11 and a biconvex lens 12 are arranged sequentially at intervals along a first direction inside the lens 1.
[0034] Among them, such as Figures 1 to 3 As shown, the plano-convex lens 10 has a convex curved surface facing away from the biconcave lens 11 and is used to face the object being photographed. The plano-convex lens 10 has a flat surface facing the biconcave lens 11. The two opposing surfaces of the biconcave lens 11 are both concave curved surfaces, and the curvature of the side facing the plano-convex lens 10 is less than the curvature of the side facing the biconcave lens 11. The two opposing surfaces of the biconcave lens 12 are both convex curved surfaces, and the side facing away from the biconcave lens 11 is used to face the image plane 2.
[0035] In this embodiment, the curvature difference between the two surfaces of the biconcave lens 11 allows the large curved surface facing the plano-convex lens 10 to correct a large amount of positive spherical aberration introduced by the plano-convex lens 10 (compensating for negative spherical aberration), while the small curved surface facing away from the plano-convex lens 10 corrects not only a portion of the spherical aberration but also the coma introduced by the preceding system. By controlling the radius of curvature of each refractive surface, various aberrations are reduced, and images with high resolution and high definition can be obtained.
[0036] In this embodiment, the parameters of each lens can be set as follows: The radius of curvature of the plano-convex lens 10 facing the subject is 8.2 mm, and the vertical distance from the subject is 122 m. The thickness of the plano-convex lens 10 is 3 mm, the refractive index is 1.78, and the dispersion coefficient is 47.5.
[0037] The distance between the plano-convex lens 10 and the biconcave lens 11 is 1.852 mm. The radius of curvature of the biconcave lens 11 on the side facing the plano-convex lens 10 is 16.65 mm, and the radius of curvature on the side facing away from the plano-convex lens 10 is 6.509 mm. The refractive index of the biconcave lens 11 is 1.76, the dispersion coefficient is 26.6, and the thickness is 1.5 mm.
[0038] The distance between the biconcave lens 11 and the biconvex lens 12 is 3.948 mm. The radius of curvature of the biconvex lens 12 facing the biconcave lens 11 is 20.68 mm, and the radius of curvature of the biconvex lens 12 facing away from the biconcave lens 11 is 17.090 mm. The thickness of the biconvex lens 12 is 2.22 mm, the refractive index is 1.77, the dispersion coefficient is 49.6, and the perpendicular distance of the biconvex lens 12 from the image plane is 18.2 mm. It should be noted that the above parameters are not unique and should be adjusted adaptively according to the lens materials and imaging requirements.
[0039] In this embodiment, the first direction is the direction of the line connecting the photographed object and the image plane 2, which is parallel to or overlaps with the optical axes of the plano-convex lens 10, the biconcave lens 11, and the biconvex lens 12.
[0040] The imaging device provided in this application embodiment allows external light to pass through a plano-convex lens 10 and a biconcave lens 11 for initial focusing, and then further converged by a biconcave lens 12. This allows the external light to smoothly transition onto the image plane 2 over a shorter distance, reducing the difficulty of aberration correction and achieving high-definition imaging at close object distances. The curvature difference between the two surfaces of the biconcave lens 11 allows the larger curved surface facing the plano-convex lens 10 to correct a large amount of positive spherical aberration introduced by the plano-convex lens 10 (compensating for negative spherical aberration), while the smaller curved surface facing away from the plano-convex lens 10 corrects some spherical aberration and also corrects coma introduced by the preceding system. By controlling the curvature of these lenses, various aberrations are reduced, improving the image sharpness. When the object being photographed is the ocular surface, the position of the ocular surface can be conjugated onto the image plane 2, increasing the image sharpness of the ocular surface.
[0041] As an optional embodiment, the lens 1 further includes a lens barrel 13, within which the plano-convex lens 10, the biconcave lens 11, and the biconvex lens 12 are all disposed. The lens barrel 13 also includes an aperture stop 14 disposed along a first direction between the plano-convex lens 10 and the biconcave lens 11, and a spacer 15 disposed along the first direction between the biconcave lens 11 and the biconvex lens 12. Figure 3As shown, the lens barrel 13 provides positioning for the light-transmitting components (plano-convex lens 10, biconcave lens 11, and biconvex lens 12). Along the path of external light, the aperture stop 14 is positioned after the plano-convex lens 10, which reduces the tolerance sensitivity of the plano-convex lens 10 and the biconcave lens 11 and achieves better distortion correction. The spacer 15 is positioned after the biconcave lens 11 to block stray light and ensure that the distance between the biconcave lens 11 and the biconvex lens 12 remains at a preset distance. The plano-convex lens 10, aperture stop 14, biconcave lens 11, spacer 15, and biconvex lens 12 can be sequentially abutted to limit their position, thereby increasing their stability within the lens barrel 13.
[0042] In this embodiment, both the aperture stop 14 and the spacer 15 are annular, and their lengths along the first direction can be adjusted according to the desired imaging effect and the focusing distance of the light.
[0043] As an optional embodiment, the aperture stop 14 has a first blocking ring 140 extending towards the center on the side near the biconcave lens 11, and the spacer 15 has a second blocking ring 150 on the side near the biconcave lens 11. Figure 3 As shown, in this embodiment of the application, the first blocking ring 140 corrects part of the light entering the biconcave lens 11, and the second blocking ring 150 corrects part of the light passing through the biconcave lens 11.
[0044] As an optional embodiment, the end face of the first blocking ring 140 facing away from the biconcave lens 11 is a first inclined surface 141, and the end face of the second blocking ring 150 facing away from the biconcave lens 11 is a second inclined surface 151. Figure 3 As shown, the first inclined surface 141 on the first shielding ring 140 and the second inclined surface 151 on the second shielding ring 150 are both inclined toward the direction of the biconcave lens 11, which not only helps to reduce weight, but also reduces the obstruction of light entering and exiting the biconcave lens 11.
[0045] As an optional embodiment, the imaging device further includes a camera 3, which includes a housing 30 and a photosensitive unit 31 located within the housing 30. The photosensitive unit 31 includes a photosensitive chip 310 and a circuit board 311 connected in a circuit, and the photosensitive chip 310 is located in the light propagation path. Figures 4 to 7As shown, in this embodiment, the photosensitive chip 310 can serve as the image plane 2, converting the captured light signal into an electronic signal and transmitting it to the circuit board 311. The circuit board 311 then processes the received electronic signal to support imaging. In this embodiment, the photosensitive chip 310 can be a CCD (charge-coupled device), which features high sensitivity and low noise; alternatively, the photosensitive chip 310 can be a CMOS (metal-oxide-semiconductor) device, which features high integration, low power consumption, and low cost.
[0046] In an optional embodiment, the camera 3 further includes a light filter section 32, which includes a light filter 320 and a light filter base 321 for mounting the light filter 320. The light filter base 321 has a light filter opening 322. The light filter 320, the light filter opening 322, and the photosensitive chip 310 are disposed opposite to each other, and the light filter base 321 is positioned within the housing 30. Figure 6 As shown, the filter 320 in this embodiment only allows light of a specific wavelength to pass through. It can enhance or highlight colors according to the characteristics of the object being photographed. The filter 320 also helps reduce exposure and avoid overexposure during imaging. The filter base 321 can be installed inside the housing 30 by bolt connection or press-fitting.
[0047] In an optional embodiment, the filter unit 32 further includes a filter support 323, on which at least two filters 320 (which may be two, three, four, etc.) are arranged vertically in sequence. The filter base 321 has a slot 325 for sliding the filter support 323 and a control component for controlling the movement of the filter support 323, so as to control the required filters 320 to move to be opposite to the filter opening 322, the filter opening 322 being located within the slot 325, such as... Figure 6 , Figures 8 to 9 As shown. Different filters 320 allow light of different wavelengths to pass through. By switching between different filters 320, certain wavelengths of light can be selectively absorbed or reflected, thereby optimizing the color, contrast, and sharpness of the image. For example, the upper filter 320 only allows light with wavelengths between 650nm and 800nm to pass through, while the lower filter 320 only allows light with wavelengths greater than 810nm to pass through.
[0048] In an optional embodiment, the control unit includes a motor and a rocker arm 326 connected by a drive. The filter holder 323 also has a transverse opening 324. The rocker arm 326 is provided with a bent section 327, which is confined within the transverse opening 324. When the rocker arm 326 swings under the drive of the motor, it causes the filter holder 323 to slide within the slot 325 to switch the filter 320. In this embodiment, one end of the rocker arm 326 is fixedly sleeved on the output shaft of the motor. The motor can be controlled by the controller in the camera 3 to rotate forward or backward, so as to drive the rocker arm 326 to rotate clockwise or counterclockwise, pushing the bent section 327 to slide within the transverse opening 324 to move the filter holder 323 up and down, so that the upper or lower filter 320 is switched to face the filter port 322.
[0049] In an optional embodiment, a planar lens 33 is further mounted on the lens 1 or the camera 3, the planar lens 33 being located between the biconvex lens 12 and the image plane 2. Figures 1 to 2 As shown, the flat lens 33 in this embodiment can improve the chromatic aberration elimination effect and increase image quality. The flat lens 33 can be made of polyolefin material, and the chromatic aberration elimination effect can be further improved by manufacturing micro-diffraction chromatic aberration.
[0050] In an optional embodiment, a light-transmitting hole 300 is provided on the side of the housing 30 facing the lens 1, and the flat lens 33 is mounted on the light-transmitting hole 300. The flat lens 33 is mounted as follows: Figures 4 to 5 The light-transmitting hole 300 shown saves the components required for installing the flat lens 33, ensuring light transmission through the light-transmitting hole 300 while protecting the internal components of the housing 30.
[0051] The plano-convex lens 10, biconcave lens 11, biconvex lens 12, and plano lens 33 in the embodiments of this application can all be made of glass.
[0052] As needed, the above technical solutions can be combined to achieve the best technical effect.
[0053] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.
Claims
1. An imaging device, characterized in that, include: Lens; The lens contains a plano-convex lens, a biconcave lens, and a biconvex lens arranged sequentially at intervals along a first direction. In this configuration, the plano-convex lens has a convex curved surface facing away from the biconcave lens and is used to face the object being photographed. The plano-convex lens has a flat surface facing the biconcave lens. The two opposing surfaces of the biconcave lens are both concave curved surfaces, and the curvature of the side facing the plano-convex lens is less than the curvature of the side of the biconcave lens facing the biconvex lens. The two opposing surfaces of the biconvex lens are both convex curved surfaces, and the side facing away from the biconcave lens is used to face the image plane.
2. The imaging device according to claim 1, characterized in that, The lens also includes a lens barrel, and the plano-convex lens, the biconcave lens, and the biconvex lens are all disposed inside the lens barrel; The lens barrel is also provided with an aperture stop disposed along the first direction between the plano-convex lens and the biconcave lens, and a spacer disposed along the first direction between the biconcave lens and the biconvex lens.
3. The imaging device according to claim 2, characterized in that, The aperture stop is provided with a first blocking ring extending towards the center on the side near the biconcave lens, and the spacer is provided with a second blocking ring on the side near the biconcave lens.
4. The imaging device according to claim 3, characterized in that, The end face of the first shielding ring facing away from the biconcave lens is a first inclined surface, and the end face of the second shielding ring facing away from the biconcave lens is a second inclined surface.
5. The imaging device according to any one of claims 1-4, characterized in that, The imaging device further includes a camera, which includes a housing and a photosensitive part located within the housing. The photosensitive part includes a photosensitive chip and a circuit board connected in a circuit, and the photosensitive chip is located in the path of light propagation.
6. The imaging device according to claim 5, characterized in that, The camera also includes a filter unit, which includes a filter and a filter base for mounting the filter. The filter base has a filter port. The filter, the filter port, and the photosensitive chip are arranged opposite to each other. The filter base is positioned inside the housing.
7. The imaging device according to claim 6, characterized in that, The filtering unit also includes a filter bracket, on which at least two filters are arranged vertically in sequence. The filter base has a slot for the filter bracket to slide and a control component for controlling the movement of the filter bracket, so as to control the required filter to move to be positioned opposite to the filter port, and the filter port is located in the slot.
8. The imaging device according to claim 7, characterized in that, The control unit includes a motor and a rocker arm connected to the drive. The filter bracket is also provided with a horizontal opening. The rocker arm is provided with a bent section, which is limited to the horizontal opening. When the rocker arm swings under the drive of the motor, it drives the filter bracket to slide in the slot to switch the filter.
9. The imaging device according to claim 5, characterized in that, The lens or the camera is also equipped with a flat lens, which is located between the biconvex lens and the image plane.
10. The imaging device according to claim 9, characterized in that, A light-transmitting hole is provided on the side of the housing facing the lens, and the flat lens is mounted on the light-transmitting hole.