A stray light shielding structure and an ultra-macro imaging module including the same

Abstract

The present invention discloses a stray light shielding structure, which is characterized in that: the stray light shielding structure includes a front protection window with silk printing in front of the object side end face of a super-macro lens disposed in the lens mounting through hole of the light guide structure, and a light shielding ring disposed between the edge side wall of the front protection window and the lens mounting through hole and extending in the front-rear direction, etc. The present invention uses a light shielding ring to surround the protection window with silk printing, eliminating the influence of imaging flare caused by a large amount of illumination light entering the protection window and then hitting the lens, and eliminating the influence of the scattered light illuminating surface impurities on the imaging quality after the illumination light enters the protection window. Further, the back protection window of the module uses silk printing and back glue to shield stray light, eliminating the influence of stray light between the super-macro module and the device lens on the imaging effect, and improving the overall imaging quality.

Description

Technical Field

[0001] The present invention belongs to the field of external optical imaging, and particularly relates to a stray light shielding structure and a super-macro imaging module including the same. Background Art

[0002] With the development of optical imaging technology, more and more instrument devices and consumer products are added with imaging devices, and the diversity and importance of their functions are also increasing. There are various imaging modules emerging on the market, but in the field of super-macro imaging, there are currently no mature modular products.

[0003] Regarding imaging modules, current ordinary macro modules are mostly manual focus modules equipped with wide-angle macro lenses. To make up for the defect of insufficient illumination, lighting beads are often simply arranged around the lens to illuminate the imaging field of view. For example, the Chinese utility model patent publication documents with application numbers CN200720057106.0 and CN201320093315.6. The main disadvantages of this solution are:

[0004] 1) Due to the limitation of its own wide-angle macro lens, the module cannot achieve autofocus by moving the lens of the mobile device itself. In actual use, manual focusing operation is inconvenient, and it is difficult to directly capture clear images.

[0005] 2) The illumination light source is directly irradiated by the lighting beads. During the movement of the object, the actual illumination effect uniformity will change greatly. Especially in the super-macro imaging environment where the object surface is extremely close, the illumination will be seriously insufficient, and there will be strong and relatively concentrated reflections when observing high-reflectivity surfaces in this illumination mode, affecting the imaging quality.

[0006] 3) The lighting element needs to be powered separately, rather than directly using the common flash LED light source on current mobile devices. There is a situation where the battery needs to be charged or replaced with the same type of battery after the battery runs out, and the use is relatively inconvenient.

[0007] Changing the exit angle of the illumination light source, adding a guiding component to the light, and controlling the LED emission angle and other methods can all improve the illumination problem. For example, the Chinese utility model patent with application number CN201720470643.1 discloses a case of improving the illumination of a macro imaging module through a structure similar to an optical fiber, and specific requirements for the emission angle of its lighting beads are also made. The advantage of this solution is that it solves the problem of limited supplementary light for the macro imaging module, but it has more components, the structure is too complex, the installation difficulty is high, which is not conducive to the miniaturization and integration of the module, and the cost increases.

[0008] The Chinese utility model patent with the application number CN201920098694.5 discloses a solution for improving the macro imaging module through a light guide structure. The advantage of this solution is that it makes the illumination of the macro imaging module uniform and controls the overall volume. However, there is currently no finished product for the optical lens with a symmetrical structure integrated with the autofocus module involved in this solution. Moreover, since the module is integrally arranged inside the device, consideration needs to be given to the occupation of the overall volume of the device and the shielding of stray light inside the body, resulting in relatively high design and manufacturing difficulty and cost. The Chinese invention patent with the application number CN201811055795.0 discloses a macro module externally connected to the device camera and using a light guide structure for illumination. In this solution, the illumination light source is an internal circuit and light-emitting diodes, and the LED flash of the device itself is not directly utilized, which increases the cost of the product itself and requires battery replacement, making it inconvenient to use.

[0009] The Chinese invention patent with the application number CN201811003701.5 discloses a macro imaging module that illuminates the object surface through a light guide structure. Its lens is externally connected to the device camera for imaging, and the light source used is the flash light source of the device itself, achieving compatibility with multiple models and having a simple and easy-to-use structure. However, a common defect shared by this invention and the above-mentioned utility model or invention is that the module lenses are all directly in contact with the outside world, and the outermost lens is vulnerable to damage or contamination, resulting in low reliability.

[0010] The Chinese patents with the application numbers CN201922072118.6 and CN201922072041.2 disclose a mobile terminal, in which at least one of the multiple lenses is a main camera lens and at least one is a super macro lens, capable of realizing super macro shooting and meeting the needs of close-range super macro shooting; however, this solution requires the mobile terminal itself to have a super macro lens and cannot meet the super macro shooting needs of ordinary mobile phones without a super macro lens.

[0011] Miniaturized super macro imaging modules and imaging devices applying the same have great application prospects and value in the fields of biomedicine, intelligent manufacturing, and consumer electronics. Currently, there is a lack of products that can comprehensively solve the above problems. Summary of the Invention

[0012] In view of at least one of the above-mentioned defects or improvement requirements in the prior art, the present invention provides a stray light shielding structure and a super macro imaging module including the same. A light-shielding ring surrounds the protection window with silk printing, eliminating the influence of imaging flare caused by a large amount of illumination light entering the protection window and then hitting the lens, and eliminating the influence of the scattered light illuminating surface impurities on the imaging quality after the illumination light enters the protection window. Further, the back protection window of the module uses silk printing and back glue to shield stray light, eliminating the influence of stray light between the super macro module and the device lens on the imaging effect, and overall imaging quality is improved.

[0013] To achieve the above object, according to one aspect of the present invention, a stray light shielding structure is provided. The stray light shielding structure includes a front protection window disposed in front of the object-side end face of the ultra-macro lens in the lens mounting through-hole of the light guiding structure.

[0014] The light guiding structure is made of a semi-transparent or transparent solid material, and is detachably connected to a portable imaging device having a camera and an illuminator. Its lens mounting through-hole is directly opposite to the camera. The object-side end face of the light guiding structure protrudes forward closer to the object surface than the front protection window, and the inner annular surface of the protrusion forms a light output surface. The light guiding structure covers the illuminator, guides the irradiation light of the illuminator, and exports it to the object surface from the light output surface.

[0015] The front protection window is made of a light-transmitting solid material. The outer periphery of the image-side end face and the edge side wall of the front protection window have a front protection window silk screen, and the front protection window silk screen does not block the viewing angle of the lens.

[0016] The stray light shielding structure further includes a light shield, which is disposed between the edge side wall of the front protection window and the lens mounting through-hole, extends in the front-rear direction, and the distance from the object-side end face of the light shield to the object surface is less than or equal to the distance from the object-side end face of the front protection window to the object surface.

[0017] Preferably, the front protection window is made of a solid material with good light-transmitting performance such as glass, sapphire or transparent plastic, has a uniform thickness, and is located in front of the object-side end face of the lens. And its thickness should not affect the focal plane range and imaging quality of the lens. Its size should not make its edge enter the lens field of view. The protection window can be bonded to the lens or other structures using back glue or dot glue, or can be directly mechanically fitted or embedded in other structures.

[0018] Preferably, the light shield can be a part of the object-side of the lens package, or can be an independent component. Its material is an opaque solid such as metal or non-transparent plastic. Its structure surrounds the edge side wall of the protection window, and can also have a stepped surface to surround a part of the surface of the edge area of the image-side end face of the protection window. The distance from the object-side end face of the light shield to the object surface is less than or equal to the distance from the object-side end face of the protection window to the object surface.

[0019] Preferably, the stray light shielding structure further includes a rear protection window, which is made of a light-transmitting solid material and is disposed behind the image-side end face of the lens. The front and rear protection windows enclose the lens in the light guiding structure, and the edge of the rear protection window does not enter the field of view of the camera of the portable imaging device. Specifically, the rear protection window is made of a solid material with good light-transmitting performance such as glass, sapphire or transparent plastic, has a uniform thickness, and is located behind the image-side end face of the lens. And its thickness should not affect the focal plane range and imaging quality of the lens. Its size should not make its edge enter the field of view of the camera of the portable imaging device in the installed state.

[0020] Preferably, the object-side end face of the back protection window has a screen printing for the back protection window, and the screen printing for the back protection window does not enter the field of view of the camera of the portable imaging device, forming a through hole for the screen printing lens. If the back protection window covers the illuminator of the portable imaging device in the installed state, there should be no screen printing in the front part of the illuminator.

[0021] Preferably, the screen printing for the back protection window does not cover the illuminator of the portable imaging device, forming a through hole for the screen printing illumination.

[0022] Preferably, the object-side end face of the back protection window has an adhesive for bonding the back protection window to the light guide structure, and the projected area of the adhesive is not larger than the area of the screen printing for the back protection window.

[0023] Preferably, the front and back end faces of the front protection window and / or the back protection window have functional coatings, such as an antireflection coating (AR coating), a hard coating, a hydrophobic and oleophobic coating, etc.

[0024] Preferably, a first groove is formed on the image-side end face of the light guide structure, facing the illuminator, and a condensing surface is formed at the bottom of the groove;

[0025] Multiple reflecting surfaces are arranged in the light guide structure, including:

[0026] A splitting and reflecting surface formed at the bottom of a second groove opened on the object-side end face of the light guide structure in front of the first groove;

[0027] A backward reflecting surface formed at the bottom of a third groove opened on the image-side end face of the light guide structure on the side of the first groove;

[0028] An outgoing pre-reflecting surface formed on the object-side wall surface of the light guide structure outside the outgoing surface in front of the third groove;

[0029] The optical path includes light from the illuminator entering the light guide structure through the condensing surface, and sequentially passing through the splitting and reflecting surface, the backward reflecting surface, and the outgoing pre-reflecting surface, and finally exiting from the outgoing surface and hitting the object surface.

[0030] Preferably, the multiple reflecting surfaces further include:

[0031] An opposite reflecting surface formed on the outer wall of the light guide structure above and below the first groove;

[0032] Two-side supplementary light reflecting surfaces formed at the bottom of a fourth groove opened on the image-side end face of the light guide structure above and below the lens mounting through hole;

[0033] The optical path further includes light from the illuminator that enters the light guide structure through the condenser surface, and sequentially passes through the beam splitting and reflecting surface, the opposing reflecting surface, the side supplementary light reflecting surfaces, and the pre-emission reflecting surface, and finally exits from the light emitting surface and hits the object surface.

[0034] Preferably, the multiple reflecting surface further includes:

[0035] The opposing secondary reflecting surface formed on the distal side of the lens mounting through hole away from the condenser surface and the outer wall of the light guide structure;

[0036] The back-facing symmetric reflecting surface formed on the bottom of the fifth groove opened on the image side end face of the light guide structure, and the fifth groove is symmetrically arranged with respect to the third groove relative to the lens mounting through hole;

[0037] The optical path further includes light from the illuminator that enters the light guide structure through the condenser surface, and the opposing secondary reflecting surface reflects the light incident on it to the back-facing symmetric reflecting surface, and finally exits from the light emitting surface and hits the object surface.

[0038] To achieve the above object, according to one aspect of the present invention, there is provided a super macro imaging module, including a super macro lens, a light guide structure mounted on a housing, and a stray light shielding structure mounted on the light guide structure.

[0039] To achieve the above object, according to one aspect of the present invention, there is provided a light guide structure with multiple reflecting surfaces. The light guide structure is made of a semi-transparent or transparent solid material, and is detachably connected to a portable imaging device having a camera and an illuminator. It is provided with a lens mounting through hole, facing the camera. The object side end face of the light guide structure protrudes forward more than the object side end face of the lens package and is closer to the object surface. The inner side of the protruding ring forms a light emitting surface, and the illumination light entering the light guide structure finally hits the object surface through the refraction or scattering of this surface;

[0040] The lens mounted in the lens mounting through hole is a super macro lens; the lens includes a lens group and a lens package, which is located directly in front of the camera of the portable imaging device in the connected state during use; the lens mounting through hole is a circular through hole, and the internal structure of this through hole can have steps. The light guide structure and the lens are connected by gluing or other means, and the diameter of any position in the through hole is larger than the diameter of the lens package at this position in the installed state;

[0041] A first groove is opened on the image side end face of the light guide structure, facing the illuminator, and the bottom of the groove forms a condenser surface;

[0042] A multiple reflecting surface is provided inside the light guide structure for reflecting the illumination light propagating inside the light guide structure to optimize the illumination situation and imaging effect on the object side; specifically including:

[0043] The spectral reflection surface formed at the bottom of the second groove opened on the front side of the first groove and the front end face of the light guide structure;

[0044] The back reflection surface formed at the bottom of the third groove opened on the side of the first groove and the image side end face of the light guide structure;

[0045] The pre-emission reflection surface formed on the front side of the third groove, outside the light-emitting surface, and on the object side wall surface of the light guide structure;

[0046] The optical path includes the light from the illuminator entering the light guide structure through the light-condensing surface, and successively passing through the spectral reflection surface, the back reflection surface, the pre-emission reflection surface, and finally exiting from the light-emitting surface and hitting the object surface.

[0047] Preferably, the multiple reflection surfaces further include:

[0048] The opposite reflection surfaces formed above and below the first groove and on the outer wall of the light guide structure;

[0049] The two-side supplementary light reflection surfaces formed at the bottom of the fourth groove opened above and below the lens mounting through hole and on the image side end face of the light guide structure;

[0050] The optical path further includes the light from the illuminator entering the light guide structure through the light-condensing surface, and successively passing through the spectral reflection surface, the opposite reflection surfaces, the two-side supplementary light reflection surfaces, the pre-emission reflection surface, and finally exiting from the light-emitting surface and hitting the object surface.

[0051] Preferably, the multiple reflection surfaces further include:

[0052] The opposite secondary reflection surface formed on the outer wall of the light guide structure at the distal side of the lens mounting through hole away from the light-condensing surface;

[0053] The back symmetric reflection surface formed at the bottom of the fifth groove opened on the image side end face of the light guide structure, and the fifth groove is symmetrically arranged with respect to the third groove relative to the lens mounting through hole;

[0054] The optical path further includes the light from the illuminator entering the light guide structure through the light-condensing surface, and the light incident on the opposite secondary reflection surface is reflected by the opposite secondary reflection surface to the back symmetric reflection surface, and finally exits from the light-emitting surface and hits the object surface.

[0055] Preferably, the light-emitting surface is a conical surface, or an arc surface, or a combination of both.

[0056] Preferably, the light-condensing surface is a curved surface, or a combination of different curved surfaces, or a combination of flat surfaces, or a combination of a curved surface and a flat surface.

[0057] Preferably, each of the multiple reflection surfaces is independently selected from a plane, a curved surface, and a combination of a plane and a curved surface.

[0058] Preferably, a scattering layer is partially or entirely provided on the outer surface of the light guide structure, which can be a white coating or covering material for fully reflecting and scattering the internal light. The scattering layer shall not cover the light-condensing surface and the light-emitting surface of the light guide structure.

[0059] Preferably, the light guide structure is symmetrically arranged with respect to the longitudinal section passing through the centers of the lens mounting through-hole and the first groove.

[0060] Preferably, the two opposite reflecting surfaces are symmetrically arranged on both sides of the second groove.

[0061] Preferably, an even number of the opposite secondary reflecting surfaces are integrally in a symmetric wave shape, and the paired opposite secondary reflecting surfaces form an outward bulge.

[0062] Preferably, the lens package in front of the ultra-macro lens includes a front protection window.

[0063] To achieve the above object, according to another aspect of the present invention, there is also provided an ultra-macro imaging module, including a lens and the multi-reflecting surface light guide structure, a front protection window, and a back protection window mounted on a housing;

[0064] The lens is installed in the lens mounting through-hole of the light guide structure, and the front protection window and the back protection window are sequentially arranged in front and at the back.

[0065] Preferably, the housing is made of a solid material with a certain rigidity such as metal or plastic, or a structural member formed by connecting a variety of the above materials. It has a cavity inside for accommodating and connecting the light guide structure and the above structures such as the lens, the aperture stop, and the protection window mounted thereon, and the object-side end face of the housing shall not exceed the object surface.

[0066] Preferably, it further includes a connector, which is located on the housing and can be a magnet, an adhesive, or other mechanical structures for positioning and fastening the ultra-macro imaging module on a portable imaging device.

[0067] The multi-reflecting surface light guide structure of the present invention and the ultra-macro imaging module including it, through the optimized design of the structure, make the imaging module small, light, highly reliable, and with good imaging quality.

[0068] The multi-reflecting surface light guide structure of the present invention and the ultra-macro imaging module including it, by constructing multi-reflecting surfaces to form multiple light guide optical paths, make the illumination from the illuminator of the portable imaging device sufficient and with high uniformity, and at the same time, it is easy to manufacture and assemble.

[0069] The above technical features can be combined with each other as long as they do not conflict with each other.

[0070] Generally speaking, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0071] 1. For the stray light shielding structure of the present invention and the ultra-macro imaging module including the same, an aperture stop surrounds the protective window with silk printing, eliminating the influence of imaging flare caused by a large amount of illumination light entering the protective window and then hitting the lens, and also eliminating the influence of the scattered light illuminating surface impurities on the imaging quality after the illumination light enters the protective window.

[0072] 2. For the stray light shielding structure of the present invention and the ultra-macro imaging module including the same, the back protective window of the module uses silk printing and back glue to shield stray light, eliminating the influence of stray light between the ultra-macro module and the device lens on the imaging effect, and improving the overall imaging quality.

[0073] 3. For the stray light shielding structure of the present invention and the ultra-macro imaging module including the same, the adopted back protective window completely encloses the lens with the object-side protective window from the other end, avoiding external contamination and damage to the lens itself, and having high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 is a schematic cross-sectional view of the use state of an ultra-macro imaging module of the present invention in a certain form;

[0075] Figure 2 is Figure 1 a partial illumination light path schematic diagram of the light guiding structure of this imaging module in a certain form;

[0076] Figure 3 is Figure 1 another partial illumination light path schematic diagram of the light guiding structure of this imaging module in a certain form;

[0077] Figure 4 is a schematic cross-sectional view of the structure of an ultra-macro imaging module of the present invention;

[0078] Figure 5 is Figure 4 a partially enlarged schematic cross-sectional view of the stray light shielding structure;

[0079] Figure 6 is a schematic cross-sectional view of the use state of another form of the ultra-macro imaging module of the present invention;

[0080] Figure 7 is a partial illumination light path schematic diagram of the light guiding structure in another form;

[0081] Figure 8 is another partial illumination light path schematic diagram of the light guiding structure in another form. DETAILED DESCRIPTION OF THE INVENTION

[0082] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be further described in detail below in conjunction with the specific embodiments.

[0083] As Figures 1-5 shown, the present invention provides a super-macro imaging module, which is detachably connected to a portable imaging device having a camera and an illuminator. The imaging device 3 is, for example, a digital product such as a smart phone or a tablet computer, which has a camera 301 and an illuminator 302. The camera 301 can be a fixed-focus camera module or an AF autofocus camera module, and the illuminator 302 can be a flash of the device or other fill lights.

[0084] The lens 101 of the super-macro imaging module 1 includes a lens group 1011 and a lens package 1012; in the connected state during use, the lens 101 of the super-macro imaging module 1 is located directly in front of the camera 301 of the portable imaging device 3, and the lens 101 is installed in the lens mounting through hole 1021 on the light guide structure 102.

[0085] The light guide structure 102 is made of transparent plastic. At the same time, the lens mounting through hole 1021 on the light guide structure 102 is a stepped hole, and its through hole step surface is 10211. The light guide structure 102 and the lens 101 are bonded with glue (not shown in the figure). After installation, the image-side end surface 1022 of the light guide structure is flush with the image-side end surface 1013 of the lens, and the distance between the object-side end surface 1023 of the light guide structure and the object-side end surface 1014 of the lens is 0.1 - 20 mm. Preferably, the distance is 0.8 - 1 mm.

[0086] An outgoing light surface 1024 is provided on the circular edge where the lens mounting through hole 1021 of the light guide structure 102 intersects with its object-side end surface 1023. Its shape is a conical surface, as Figure 2 、 4 shown. The angle between the generatrix 10241 and the object-side end surface of the light guide structure is 20° - 45°. Preferably, the angle is 33°. The illumination light is refracted or scattered by this outgoing light surface 1024 to emit the outgoing light 10242 that hits the object surface, so that the object surface forms uniform illumination.

[0087] The light guide structure 102 is provided with a multiple reflection surface 1025, as Figure 2 in the sectional view of Figure 3As shown, in this embodiment, this multiple reflection surface includes: a beam splitting reflection surface 10251, an opposed reflection surface 10252, an opposed secondary reflection surface 10253, a back reflection surface 10254, side supplementary light reflection surfaces 10255, a pre-emission reflection surface 10256, and a back symmetric reflection surface 10257. The optical path of the reflected light inside it is as Figures 2-4 shown. In this embodiment, the above multiple reflection surface 1025 is a plane.

[0088] Preferably, the image-side end face 1023 of the light guide structure 102 has a condenser surface 1026, and its condensed light 10261 is as Figure 4 shown. In this embodiment, the surface is a partial spherical surface. In the installation state as Figure 1 shown, the center of this surface is located in the front area directly in front of the illuminator 302 of the portable imaging device.

[0089] Details are described below.

[0090] A first groove is formed in the image-side end face of the light guide structure, facing the illuminator, and the bottom of the groove forms a condenser surface 1026;

[0091] A multiple reflection surface 1025 is arranged inside the light guide structure for reflecting the illumination light propagating inside the light guide structure to optimize the illumination condition and imaging effect on the object side; specifically including:

[0092] The beam splitting reflection surface 10251 formed at the bottom of the second groove opened on the object-side end face of the light guide structure in front of the first groove;

[0093] The back reflection surface 10254 formed at the bottom of the third groove opened on the image-side end face of the light guide structure on the side of the first groove;

[0094] The pre-emission reflection surface 10256 formed on the object-side wall surface of the light guide structure in front of the third groove and outside the light-emitting surface;

[0095] The optical path includes the light from the illuminator entering the light guide structure through the condenser surface, and successively passing through the beam splitting reflection surface, the back reflection surface, and the pre-emission reflection surface, and finally exiting from the light-emitting surface and hitting the object surface.

[0096] Preferably, the multiple reflection surface further includes:

[0097] The opposed reflection surface 10252 formed on the outer wall of the light guide structure above and below the first groove;

[0098] The side supplementary light reflection surfaces 10255 formed at the bottom of the fourth groove opened on the image-side end face of the light guide structure above and below the lens mounting through hole;

[0099] The optical path further includes light from the illuminator entering the light guide structure through the condenser surface, and successively passing through the beam splitting and reflecting surface, the opposing reflecting surface, the side supplementary light reflecting surfaces, and the pre-emission reflecting surface, and finally exiting from the light emitting surface and hitting the object surface.

[0100] Preferably, the multiple reflecting surfaces further include:

[0101] The opposing secondary reflecting surface 10253 formed on the distal side of the lens mounting through hole away from the condenser surface and the outer wall of the light guide structure;

[0102] The back symmetric reflecting surface formed on the bottom of the fifth groove opened on the image side end face of the light guide structure, and the fifth groove is symmetrically arranged with respect to the third groove relative to the lens mounting through hole;

[0103] The optical path further includes light from the illuminator entering the light guide structure through the condenser surface, and the light incident on the opposing secondary reflecting surface is reflected by the opposing secondary reflecting surface to the back symmetric reflecting surface, and finally exits from the light emitting surface and hits the object surface.

[0104] Preferably, the light emitting surface 1024 is a conical surface, or an arc surface, or a combination of both.

[0105] Preferably, the condenser surface 1026 is a curved surface, or a combination of different curved surfaces, or a combination of flat surfaces, or a combination of a curved surface and a flat surface.

[0106] Preferably, each of the surfaces in the multiple reflecting surfaces 1025 is independently selected from a plane, a curved surface, and a combination of a plane and a curved surface.

[0107] Preferably, a scattering layer is provided locally or entirely on the outer surface of the light guide structure, which can be a white coating or covering material for making the light inside it fully reflected and scattered, and the scattering layer shall not cover the condenser surface and the light emitting surface of the light guide structure.

[0108] Preferably, the light guide structure is symmetrically arranged with respect to the longitudinal section passing through the center of the lens mounting through hole and the first groove.

[0109] Preferably, the two opposing reflecting surfaces 10252 are symmetrically arranged on both sides of the second groove.

[0110] Preferably, an even number of the opposing secondary reflecting surfaces 10253 are integrally in a symmetric wave shape, and the paired opposing secondary reflecting surfaces form an outward bulge.

[0111] Preferably, the lens package in front of the ultra-macro lens includes a protective window 103.

[0112] Such as Figure 5In this case, the protective window 103 is made of glass material, with a thickness of 0.3 mm - 0.8 mm, which does not affect the focal plane range and imaging quality of the lens. Its position is in front of the object side end 1014 of the lens. Its appearance is circular, with a diameter of 7 - 15 mm, and its edge does not enter the lens field of view.

[0113] The distance from the object side end face 1031 of the protective window to the object surface is greater than the distance from the object side end face 1023 of the light guiding structure to the object surface, and the distance between the two parallel end faces is 0.1 - 1 mm. The image side end face 1032 of the protective window has a silk screen 1033, whose color is black. There is no silk screen obstruction directly in front of the lens field of view range of the object side end face 1031 of the protective window, and the edge of the silk screen does not enter the lens 101 field of view.

[0114] In this embodiment, a double-sided adhesive 1034 is pasted on the image side end face 1032 of the protective window, whose color is black, and the overall thickness is 0.05 - 0.3 mm. The double-sided adhesive 1034 has a through hole larger than or equal to the lens field of view range in front of the lens 101 field of view range, and its edge does not block the lens

[0115] In this embodiment, the object side end face 1031 surface of the protective window has a hydrophobic and oleophobic film (not shown in the figure).

[0116] As Figures 4-5 In this case, the light shield 104 is made of an opaque solid material such as metal or non-transparent plastic. In this embodiment, the light shield 104 is independent of the lens package, and its shape is a two-end through-cylindrical tube with a stepped surface. Its side wall 1041 surrounds the edge side wall of the protective window. The distance from the object side end face 1042 in its installed state to the object surface is less than or equal to the distance from the object side end face 1031 of the protective window to the object surface, and the projection of its stepped surface 1043 coincides with the projection area of the edge part of the image side end face 1032 of the protective window.

[0117] As Figures 4-5 In this case, the back protective window 105 is made of a solid material with good light transmission performance such as glass, sapphire or transparent plastic, and has a uniform thickness. In this embodiment, its thickness is 0.3 - 0.8 mm, and its thickness does not affect the focal plane range and imaging quality of the lens. Its position is behind the image side end face 1013 of the lens, and its size should meet the requirement that its edge does not enter the field of view range of the camera 301 of the portable imaging device in the installed state.

[0118] In this embodiment, the object-side end face 1051 of the back protection window may have a silk screen 1052, and the silk screen 1052 should not enter the field of view of the camera 301 of the portable imaging device in the installed state. That is, the silk screen in the area behind the lens has a through hole 10521. In this embodiment, the diameter of the through hole 10521 of the silk screen lens is smaller than the diameter of the image-side end face 1014 of the lens and larger than the diameter of the circle formed by the intersection of the image-side field angle of the lens and the object-side end face 1051 of the back protection window. That is, the silk screen 1052 can block a part of the image-side end face 1013 of the lens and does not affect the normal imaging of the lens 101.

[0119] In this embodiment, in the installed state, the back protection window 105 covers the illuminator 302 of the portable imaging device, and a silk screen illumination through hole 10522 is provided in the silk screen of a partial area in front of the illuminator 302.

[0120] In this embodiment, the object-side end face 1051 of the back protection window has a back glue 1053 of the back protection window for connecting the back protection window to the housing 106 or the light guide structure 102. The back glue does not cover the circle formed by the intersection of the image-side field angle 1015 of the lens and the object-side end face 1051 of the back protection window, and its projection does not cover the necessary light-transmitting area above the device illuminator 302 in the installed state.

[0121] Preferably, the colors of the back glue and silk screen of the back protection window and the lens protection window are black.

[0122] In this embodiment, the image-side end face 1054 of the back protection window may have a hydrophobic and oleophobic film (not shown in the figure).

[0123] As Figure 5 shown (the optical path in the figure is the original optical path without shielding to highlight the shielding effect), in this embodiment, the light-shielding ring 104 blocks all stray light reflected from the side and image-side end face of the lens protection window 103 and enters. The silk screen 1033 of the protection window blocks most of the large-angle light entering from the edge of the object-side end face of the lens protection window 103, and the back glue 1053 of the back protection window blocks most of the stray light that may enter the device camera and is emitted from the image-side end face of the light guide structure 102 and the hole wall of the lens installation through hole.

[0124] As Figure 1 shown, in this embodiment, the housing 106 is made of a solid material with a certain rigidity such as metal or plastic, and has a cavity inside for accommodating and connecting the light guide structure and the above-mentioned structures such as the lens, light-shielding ring, and protection window installed thereon, and the object-side end face of the housing shall not exceed the object surface.

[0125] In this embodiment, the connecting member 107 is a magnet 1071. The two parts of the magnet are respectively located in the module housing and the device, with opposite magnetic poles and corresponding positions. The magnetic force after they are close to each other laterally positions and longitudinally fastens the ultra-macro imaging module at the corresponding position of the portable imaging device 3. At this position, the lens 1 of the ultra-macro imaging module is directly in front of the camera 301 of the portable imaging device, and the light-condensing surface 1026 of the light guide structure 102 is in the front area directly in front of the illuminator 302 of the portable imaging device.

[0126] As another form, as Figures 6-8 shown, the present invention provides an ultra-macro imaging module that is detachably connected to a portable imaging device having a camera and an illuminator. Compared with the foregoing, the following changes are provided.

[0127] The light guide structure 102 is made of transparent plastic. At the same time, the lens mounting through-hole 1021 on the light guide structure 102 is a stepped hole. The light guide structure 102 and the lens 101 are mechanically fitted through the thread 10212 of the lens mounting hole of the light guide structure and the lens thread 1015. After installation, the distance between the image-side end face 1022 of the light guide structure and the image-side end face 1013 of the lens is controlled by a mounting jig (not shown in the figure), and the distance dimension is 0.8 - 1 mm.

[0128] An outgoing light surface 1024 is provided on the circular edge where the lens mounting through-hole 1021 of the light guide structure 102 intersects with its object-side end face 1023. Its form is an annular curved surface. As Figure 2 shown in the sectional view, the illumination light passes through the outgoing light surface 1024 and refracts or scatters to emit the outgoing light 10242 that hits the object surface, making the object surface form uniform illumination.

[0129] A multiple reflection surface 1025 is provided on the light guide structure 102. As Figure 2 shown in the sectional view and Figure 3 shown, in this embodiment, this multiple reflection surface includes: a splitting and reflecting surface 10251, an opposing reflection surface 10252, an opposing secondary reflection surface 10253, a back reflection surface 10254, side supplementary light reflection surfaces 10255, a pre-emission reflection surface 10256, a back symmetric reflection surface 10257. The schematic diagram of the internal reflected light optical path is as Figures 6-8 shown. The above multiple reflection surfaces 1025 are curved surfaces in this embodiment.

[0130] In this embodiment, the outer surface of the light guide structure 102 has a scattering layer, which can be the oil spray on the outer surface of the light guide structure or the coated solid material or the cavity surface where the housing fits with the light guide structure. This scattering layer is a color with a high reflectivity such as white or silver.

[0131] Preferably, the image-side end face 1023 of the light guide structure 102 has a light-condensing surface 1026. In this embodiment, the surface is a pyramid surface composed of multiple inclined planes. As shown in Figure 6 In the installed state shown, the center of this surface is located in the area directly in front of the illuminator 302 of the portable imaging device.

[0132] In this embodiment, the protective window 103 is made of glass material, with a thickness of 0.3 mm - 0.8 mm, which does not affect the focal plane range and imaging quality of the lens. Its position is in front of the object-side end face 1014 of the lens. Its appearance is circular, with a diameter of 7 - 15 mm, and its edge does not enter the lens field of view. The distance from the object-side end face 1031 of the protective window to the object surface is greater than the distance from the object-side end face of the light guide structure to the object surface, and the distance between the two parallel end faces is 0.1 - 1 mm. In this embodiment, the object-side end face 1031 of the protective window has a hydrophobic and oleophobic film and an antireflection film (not shown in the figure).

[0133] In this embodiment, the aperture stop 104 is integrated with the lens package. Its shape is an annular thin wall with a stepped surface. Its material is the same as that of the lens package, which is an opaque plastic material. The side wall 1041 of the aperture stop surrounds the edge side wall of the protective window. The distance from the object-side end face 1042 of the aperture stop to the object surface is less than or equal to the distance from the object-side end face 1031 of the protective window to the object surface. The image-side end face 1032 of the protective window is adhesively bonded to the stepped surface 1043 of the aperture stop 104 by dispensing glue.

[0134] The back protective window 105 is made of a solid material with good light transmission performance such as glass, sapphire or transparent plastic, and has a uniform thickness. In this embodiment, its thickness is 0.3 - 0.8 mm, and its thickness does not affect the focal plane range and imaging quality of the lens. Its position is behind the image-side end face 1013 of the lens, and its size should meet the requirement that its edge does not enter the field of view of the camera 301 of the portable imaging device in the installed state.

[0135] Preferably, the object-side end face 1051 of the back protective window may have a silk screen 1052, and the silk screen should not enter the field of view of the camera of the portable imaging device in the installed state. If the back protective window only covers the image-side end face 1013 of the lens 101 in the installed state.

[0136] In this embodiment, the image-side end face 1054 of the back protective window may have a hydrophobic and oleophobic film (not shown in the figure).

[0137] In this embodiment, the connector 107 is a double-sided adhesive 1072, which is located in the slot of the housing or the light guide structure, pre-bonded and pressed against the imaging module. When in use, the other side is pasted on the protective window outside the device camera, and the lens 1 of the ultra-macro imaging module is located directly in front of the camera 301 of the portable imaging device in the aligned situation, and the light-condensing surface 1026 of the light guide structure 102 is located in the area directly in front of the illuminator 302 of the portable imaging device.

[0138] In summary, compared with the prior art, the solution of the present invention has the following remarkable advantages:

[0139] With the optimized design of the structure, the light guide structure with multiple reflecting surfaces of the present invention and the ultra-macro imaging module including the same make the imaging module small, light, highly reliable and with good imaging quality.

[0140] With the multiple reflecting surfaces constructed, the light guide structure with multiple reflecting surfaces of the present invention and the ultra-macro imaging module including the same form multiple light guide optical paths, ensuring sufficient and highly uniform illumination from the illuminator of the portable imaging device, and being easy to manufacture and assemble at the same time.

[0141] It can be understood that the embodiments of the system described above are merely illustrative. The units described as separate components may or may not be physically separated, and may be located in one place or distributed to different network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0142] In addition, those skilled in the art should understand that in the application documents of the embodiments of the present invention, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0143] In the description of the embodiments of the present invention, a large number of specific details are set forth. However, it should be understood that the embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description. Similarly, it should be understood that, in order to streamline the disclosure of the present invention and assist in understanding one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof.

[0144] However, the disclosed methods should not be construed as reflecting an intention that the claimed embodiments of the present invention require more features than are expressly recited in each claim. Rather, as the claims reflect, the inventive aspects lie in less than all of the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into that detailed description, with each claim standing on its own as a separate embodiment of the present invention.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A super-macro imaging module, characterized in that, It includes an ultra-macro lens, a light guide structure mounted on the housing, and a stray light shielding structure mounted on the light guide structure. The stray light shielding structure includes a front protection window disposed in front of the object-side end face of the ultra-macro lens in the lens mounting through-hole of the light guide structure; The light guide structure is made of a semi-transparent or transparent solid material, which is detachably connected to a portable imaging device having a camera and an illuminator. Its lens mounting through-hole is directly opposite to the camera. The object-side end face of the light guide structure protrudes forward closer to the object surface than the front protection window. The convex front annular inner side forms a light-emitting surface. The light guide structure covers the illuminator, guides the irradiation light of the illuminator, and exports it from the light-emitting surface to the object surface. The image-side end face of the light guide structure is flush with the image-side end face of the lens; The front protection window is made of a light-transmitting solid material. The outer periphery of the image-side end face and the edge side wall of the front protection window have a front protection window silk screen, and the front protection window silk screen does not block the viewing angle of the lens; The stray light shielding structure further includes a light-shielding ring, which is disposed between the edge side wall of the front protection window and the lens mounting through-hole, extends forward and backward, and the distance from the object-side end face of the light-shielding ring to the object surface is less than or equal to the distance from the object-side end face of the front protection window to the object surface.

2. The super-macro imaging module according to claim 1, characterized in that: The stray light shielding structure further includes a back protection window, which is made of a light-transmitting solid material and is disposed behind the image-side end face of the lens. The front and back protection windows enclose the lens in the light guide structure, and the edge of the back protection window does not enter the field of view of the camera of the portable imaging device.

3. The super-macro imaging module according to claim 2, characterized in that: The object-side end face of the back protection window has a back protection window silk screen, and the back protection window silk screen does not enter the field of view of the camera of the portable imaging device, and a silk screen lens through-hole is formed.

4. The super-macro imaging module according to claim 3, characterized in that: The back protection window silk screen does not cover the illuminator of the portable imaging device, and a silk screen illumination through-hole is formed.

5. The super-macro imaging module according to claim 3, characterized in that: The object-side end face of the back protection window has an adhesive for bonding the back protection window to the light guide structure, and the projected area of the adhesive is not larger than the area of the back protection window silk screen.

6. The super-macro imaging module according to claim 2, characterized in that: The front and / or back end faces of the front protection window and the back protection window have a functional coating.

7. The super-macro imaging module according to claim 1, characterized in that: A first groove is opened on the image-side end face of the light guide structure, directly opposite to the illuminator, and the bottom of the groove forms a light-condensing surface; Multiple reflection surfaces are provided in the light guide structure, including: A beam-splitting reflection surface formed at the bottom of a second groove opened on the object-side end face of the light guide structure in front of the first groove; A backward reflection surface formed at the bottom of a third groove opened on the image-side end face of the light guide structure on the side of the first groove; An outgoing pre-reflection surface formed on the object-side wall surface of the light guide structure outside the light-emitting surface in front of the third groove; The optical path includes light from the illuminator entering the light guide structure through the light-condensing surface, and sequentially passing through the beam-splitting reflection surface, the backward reflection surface, and the outgoing pre-reflection surface, and finally exiting from the light-emitting surface and hitting the object surface.

8. The super-macro imaging module according to claim 7, characterized in that: The multiple reflection surfaces further include: An opposite reflection surface formed on the outer wall of the light guide structure above and below the first groove; Two-side supplementary light reflection surfaces formed at the bottom of a fourth groove opened on the image-side end face of the light guide structure above and below the lens mounting through-hole; The optical path further includes light from the illuminator entering the light guide structure through the condenser surface, and sequentially passing through the beam splitting and reflecting surface, the opposing reflecting surface, the side supplementary light reflecting surfaces, and the pre-emission reflecting surface, and finally exiting from the light emitting surface and hitting the object surface.

9. The super-macro imaging module according to claim 8, characterized in that: The multiple reflecting surface further includes: The opposing secondary reflecting surface formed on the distal side of the lens mounting through hole away from the condenser surface and the outer wall of the light guide structure; The back-facing symmetric reflecting surface formed on the bottom of the fifth groove opened on the image side end face of the light guide structure, and the fifth groove is symmetrically arranged with respect to the third groove relative to the lens mounting through hole; The optical path further includes light from the illuminator entering the light guide structure through the condenser surface, and the opposing secondary reflecting surface reflects the light incident on it to the back-facing symmetric reflecting surface, and finally exits from the light emitting surface and hits the object surface.

Images