CN212483960U

CN212483960U - Optical system, imaging module and electronic equipment

Info

Publication number: CN212483960U
Application number: CN202021147536.3U
Authority: CN
Inventors: 吴云昆
Original assignee: Nanchang OFilm Optoelectronics Technology Co Ltd
Current assignee: Nanchang OFilm Optoelectronics Technology Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-02-05
Anticipated expiration: 2030-06-19

Abstract

The utility model relates to an optical system and including optical system's formation of image module and electronic equipment. The optical system comprises a lens group, and the lens group comprises at least one filter lens. The filter lens comprises a lens part and filter substances distributed in the lens part. The lens part has refractive power, and the light filtering substance can absorb light rays in partial wave bands and transmit light rays in other wave bands. In the optical system, the filtering material is distributed in the lens part, so that the filtering lens has the capability of refracting light and the filtering capability of absorbing light in partial wave bands at the same time, and further, the function of filtering interference light can be realized in the optical system without additionally configuring a filter, so that the size of the optical system is reduced, and the assembly of the optical system is easier.

Description

Optical system, imaging module and electronic equipment

Technical Field

The utility model relates to a field of making a video recording especially relates to an optical system, formation of image module and electronic equipment.

Background

In a conventional imaging device, the exposure effect of the photosensitive element on infrared light is generally weak, and if more infrared light enters the imaging device to participate in imaging, image distortion is caused, and imaging quality is affected. Therefore, the conventional imaging device usually needs to be configured with an infrared cut-off filter to filter the infrared light and transmit the visible light, so as to prevent the infrared light from reaching the photosensitive element and affecting the normal imaging.

However, the inventors have found in studies on an image pickup apparatus that the size of an infrared cut filter is generally large at present, and the use of the infrared cut filter in the image pickup apparatus increases the size of an optical system and also increases the difficulty in assembling the optical system. Moreover, most of the existing liquid lenses do not have the function of filtering infrared light, so that the infrared light is easy to participate in imaging to influence the imaging quality. In view of the above problems, the inventors have studied and made creative efforts to solve the problems of the current imaging apparatuses.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide an optical system, an imaging module, and an electronic apparatus, which are capable of increasing the size of the optical system and increasing the difficulty of assembling the optical system when an infrared cut filter is used in an imaging device.

An optical system comprises a lens group, wherein the lens group comprises at least one piece of filter lens, the filter lens comprises a lens part and filter substances distributed in the lens part, the lens part has refractive power, and the filter substances can absorb light rays of a partial waveband and transmit light rays of other wavebands.

In the optical system, the filter lens with refractive power is arranged to adjust light, and the filter substance in the filter lens can enable the filter lens to have the function of absorbing light in a partial waveband. Therefore, the filter lens has the function of adjusting light rays by the common lens and the filtering function of the common optical filter, namely in the optical system, the function of filtering interference light can be realized without additionally arranging the optical filter when the light rays are adjusted by the filter lens, so that the size of the optical system is reduced, and the assembly of the optical system is easier.

In one embodiment, the lens part is a solid lens or a liquid lens with adjustable focal length. The use of different lens portions allows more options for the design of the optical system. Also, when the lens portion is a liquid lens, the optical system can also realize a zoom function by changing the focal length of the lens portion.

In one embodiment, when the lens portion is a liquid lens, a liquid storage cavity is disposed in the lens portion, an optical liquid is disposed in the liquid storage cavity, the optical liquid enables the lens portion to have refractive power, and the filter material is doped in the optical liquid. The different lens parts are adopted to enable the arrangement of the light filtering substance to be more selective, and when the lens parts are liquid lenses, the light filtering substance can be distributed in liquid forming the lens parts in the manufacturing process of the lens parts. In addition, the shape or the volume of the optical liquid in the lens part is changed, so that the focal length of the lens part can be changed, the zooming function is realized, and the size and the structural complexity of the zooming structure are reduced.

In one embodiment, the optical liquid includes two mutually insoluble solutions, one is a conductive solution, the other is an oily insulating solution, an interface is formed between the conductive solution and the insulating solution, the shape of the interface between the conductive solution and the insulating solution can be changed by changing the magnitude of the voltage applied to the lens part, so as to change the focal length of the lens part, and the light filtering substance is distributed in the conductive solution and the insulating solution; or

The liquid storage cavity is used for drawing out or filling in the optical liquid, and the volume of the optical liquid in the liquid storage cavity can be changed by drawing out or filling in the optical liquid so as to change the focal length of the lens part. The different structures of the liquid lens allow more options for the distribution process of the filter substance. In addition, good zooming performance and optical performance are realized by a voltage applying mode or a mode of extracting and filling optical liquid, and the size and the structural complexity of the zooming structure can be reduced.

In one embodiment, when the lens portion is a solid lens, the lens portion is made of a solid material, and the filter substance is doped in the solid material making up the lens portion. The different distribution of the filter substance allows more options in the manufacturing process of the filter substance. When the light filtering substance is distributed on the whole lens part, the light filtering substance can be directly doped in the raw material for forming the lens part in the manufacturing process of the lens part. And the type of the filtering substance is changed, so that the filtering function of the lens part can be controlled, and the lens part can filter light rays with different wave bands.

In one embodiment, the filtering substance is uniformly distributed in the lens portion. The uniform distribution of the filter material enables the lens portion to have more excellent filter performance.

In one embodiment, when the lens portion is a solid lens, the filtering substance is distributed in a portion of the lens portion near the outer surface. When the filtering substance is distributed in the part of the lens part close to the outer surface, a surface penetration process can be adopted to enable the filtering substance to enter the molded lens part.

In one of the embodiments, the first and second electrodes are,

the lens group further comprises at least one imaging lens with refractive power, and the filter lens is arranged on the object side of the imaging lens; or

The lens group also comprises at least one imaging lens with refractive power, and the filter lens is arranged on the image side of the imaging lens; or

The lens group further comprises at least two imaging lenses with refractive power, and the filter lens is arranged between the two imaging lenses. Different position settings allow more options for the setting of the filter lens. In addition, a filter lens with refractive power is arranged in the optical system to replace part of the imaging lens, the filter lens can play a role in refracting light rays by the imaging lens and also can play a role in filtering interference light, so that the optical system can have a filtering function without additionally arranging an optical filter, the size of the optical system is favorably reduced, and the miniaturization design is realized.

An imaging module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed on an image side of the optical system. The optical system of any one of the embodiments is adopted in the imaging module, the imaging module has a light filtering function without additionally arranging a light filter, the size of the imaging module can be reduced, and meanwhile, the assembly of the imaging module is easier.

An electronic device comprises a shell and the imaging module, wherein the imaging module is arranged in the shell. The imaging module is adopted in the electronic equipment, so that the electronic equipment can have a light filtering function without additionally configuring a light filter, the electronic equipment can be designed in a miniaturized mode, and meanwhile the electronic equipment is easier to assemble.

Drawings

FIG. 1 is a schematic diagram of an optical system in an embodiment of the present application;

FIG. 2 is a schematic diagram of an electronic device in an embodiment of the present application;

FIG. 3 is a schematic diagram of an electronic device in another embodiment of the present application;

FIG. 4 is a schematic diagram of an electronic device in yet another embodiment of the present application;

fig. 5 is a schematic view of an imaging module according to an embodiment of the present disclosure.

100, an optical system; 110. a lens group; 111. an imaging lens; 120. a filter lens; 121. A lens section; 122. an optical liquid; 130. an imaging plane; 200. an imaging module; 210. a photosensitive element; 300. An electronic device; 310. a housing; 311. a lens barrel; 312. a light entrance hole; 320. a circuit board.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, an optical system 100 includes a lens assembly 110, wherein the lens assembly 110 includes a filter lens 120 and an imaging lens 111, the imaging lens 111 and the filter lens 120 both have refractive power and jointly function to adjust light, and the light is adjusted by the lens assembly 110 and then imaged on an imaging surface 130 of the optical system 100.

Specifically, the number of the imaging lenses 111 in the lens group 110 and the type of the refractive power of the imaging lenses 111 are not limited. For example, in the embodiment shown in fig. 1, the lens group 110 has three imaging lenses 111, and the refractive power types of the three imaging lenses 111 are positive refractive power, negative refractive power and positive refractive power sequentially from the object side to the image side. In other embodiments, the lens group 110 may further include one, two or four imaging lenses 111, and each of the imaging lenses 111 in the lens group 110 may be a positive refractive power lens or a negative refractive power lens, which may be specifically configured according to the function of the optical system 100 to adjust the light, as long as the light can be adjusted by the optical system 100 to form an image on the imaging surface 130 of the optical system 100.

The filter lens 120 includes a lens portion 121 and a filter material distributed in the lens portion 121. The filter material can absorb light in a partial wavelength band and transmit light in the remaining wavelength band, and the filter lens 120 has refractive power to adjust the light and has a filter function of absorbing light in the partial wavelength band.

It is understood that the wavelength band that the filter material in the filter lens 120 can absorb is not limited, and can be selected according to the actual use requirement. For example, in some embodiments, the optical system 100 is used in the field of visible light imaging, and in this case, in order to filter infrared light and prevent the infrared light from reaching the imaging surface 130 of the optical system 100 and interfering with normal imaging, the filter substance may be set as an infrared light absorbing substance. Specifically, in some embodiments, the filter substance may be a polymer molecule such as a rare earth ion or polyaniline that is capable of absorbing infrared light. Further, in some embodiments, the filter substance is capable of absorbing light in the near infrared band, e.g., the filter substance is capable of absorbing light having a wavelength between 780nm and 2526nm, and further, in some embodiments, the filter substance is capable of absorbing light in the near infrared short wavelength band, e.g., the filter substance is capable of absorbing light having a wavelength between 780nm and 1100 nm. Of course, in other embodiments, the filter material may also absorb some portion of the near infrared light.

It should be noted that, in the present application, the description that the filtering material can absorb light of a certain wavelength band and transmit light of the rest wavelength bands does not mean that the filtering material can completely absorb light of the certain wavelength band and completely transmit light of the rest wavelength bands. For example, when it is described that the filter substance can absorb light in the infrared band, it is understood that, in actual use, the filter substance has a large absorbance in the infrared band, and thus, after passing through the filter lens 120, the light in the infrared band of the light occupies a small percentage, while the filter substance has a small absorbance in the visible band, that is, the filter lens 120 has a large transmittance in the visible light, and after passing through the filter lens 120, the light in the visible band of the light occupies a large percentage.

In the optical system 100, the filtering material is distributed in the lens portion 121 of the filtering lens 120, so that the filtering lens 120 has both the ability to refract light and the ability to absorb light in a partial wavelength band. Therefore, in the optical system 100, while the light is adjusted by the filter lens 120, the function of filtering out the interference light can be realized without additionally configuring a filter, so that the size of the optical system 100 can be reduced, the assembling steps of the optical system 100 can be reduced, and the assembling of the optical system 100 is easier.

Further, referring to fig. 2, fig. 3 and fig. 4, the relative position relationship between the filter lens 120 and the imaging lens 111 in the lens group 110 is not limited. For example, in the embodiment shown in fig. 2, the filter lens 120 is disposed on the image side of the imaging lens 111, and is capable of filtering out the interference light in the light before the light reaches the imaging plane 130. In the embodiment shown in fig. 3, the filter lens 120 is disposed on the object side of the imaging lens 111, and even though the lens closest to the object side of the optical system 100 has the filtering function, the interference light is filtered by the filter lens 120 and cannot reach the imaging lens 111. In addition, in the embodiment of fig. 4, the filter lens 120 may also be disposed between two of the imaging lenses 111 of the lens group 110 to better adapt to different lens designs in the optical system 100. The setting of the filter lens 120 can be selected differently depending on the relative positions of the filter lens 120 and the imaging lens 111. For example, when the filter lens element 120 is disposed on the image side of the imaging lens element 111, the lens element with refractive power closest to the image side of the lens group 110 may be replaced by the filter lens element 120. By directly replacing the lens with refractive power in the lens group 111 with the filter lens 120, the optical system 100 can filter out the interference light without additionally disposing a filter, thereby reducing the size of the optical system 100, and reducing the assembly steps of the optical system 100, so that the assembly of the optical system 100 is easier. In other embodiments, any one, two or more of the refractive lenses of the lens group 110 may be replaced by the filter lens 120.

The selection of the lens portion 121 is not limited, and may be a liquid lens or a solid lens, and the process of distributing the filter material in the lens portion 121 may be selected differently according to the selection of the lens portion 121. Specifically, referring to fig. 2 and 3, in some embodiments, lens portion 121 is a liquid lens. More specifically, in some embodiments, the lens portion 121 is a liquid-filled lens, the lens portion 121 includes an inner optical liquid 122 and a lens material surrounding the optical liquid 122 and limiting the optical liquid 122, that is, a liquid storage cavity is disposed in the lens portion 121, and the optical liquid 122 is disposed in the liquid storage cavity. The lens material for limiting the optical liquid 122 may be a glass material or a plastic material. In some embodiments, the optical liquid 122 in the lens portion 121 includes two mutually insoluble solutions, one being a conductive solution and the other being an insulating solution. Specifically, in some embodiments, the conductive solution in the lens portion 121 can be an aqueous solution, and the insulating solution can be an oily solution, such as a silicone oil solution. In this case, in the process of manufacturing the lens portion 121, the optical filtering material may be distributed in one of the aqueous solution and the oily solution by dissolving, for example, phosphate particles are dissolved in the aqueous solution or the oily solution, or dissolved in the conductive solution and the insulating solution at the same time, and then the lens portion 121 is formed by limiting the two solutions by using a lens material. At this time, the filtering material is distributed in the optical liquid 122 in the lens portion 121.

In addition, in other embodiments, the lens portion 121 may also be a liquid-filled lens, and the volume of the optical liquid 122 can be changed by drawing out or filling the optical liquid 122 in the liquid storage tank of the lens portion 121, so as to change the focal length of the lens portion 121, thereby implementing the zoom function.

It is understood that, when the optical filtering substance is doped in only one of the aqueous solution and the oily solution during the manufacturing process, the optical filtering substance may penetrate into the other solution from the boundary between the two solutions after the lens part 121 is molded, since the two solutions contact each other, i.e., the optical filtering substance is doped in the two solutions during the use process. In addition, when the lens part 121 is a liquid lens, the shape of the interface between the two solutions in the lens part 121 can be changed by changing the voltage applied to the lens part 121, so that the surface shape of the lens part 121 can be changed, and the focal length of the lens part 121 can be changed. In other words, the focal length of the filter lens 120 is adjustable, and the zoom function of the optical system 100 can be realized by adjusting the focal length of the filter lens 120, thereby widening the application range of the optical system 100.

As shown in fig. 4, in some embodiments, the lens portion 121 may also be a solid lens, and in this case, the material of the lens portion 121 may be plastic or glass. In some embodiments, the lens part 121 is made by injection molding, in which case, the optical filtering substance may be directly doped in a molten injection molding material, and after the injection molding material is cooled and solidified to form the lens part 121, the optical filtering substance is distributed in the whole lens part 121, that is, in this case, the lens part 121 is made of a solid material, and the optical filtering substance is doped in the solid material forming the lens part 121. In particular, in some embodiments, the filter substance may be phosphate particles capable of absorbing light in the infrared band. At this time, phosphate particles may be added to the injection material, and heated and melted in the injection molding machine together with the injection material, and the phosphate particles are distributed in the melted injection material by stirring, and then the injection material with the distributed phosphate particles is injected into the injection mold, and cooled and solidified to form the lens portion 121. Of course, in other embodiments, the filtering substance may be permeated into the lens part 121 by applying a surface permeation process on the already molded lens part 121. At this time, the filtering material is mainly distributed in a portion of the lens part 121 near the outer surface, and the density of the filtering material is higher the closer to the outer surface of the lens part 121. For example, in some embodiments, the filter material phosphate particles are made into a phosphate solution, and the molded lens portion 121 is placed in the phosphate solution, and the phosphate molecules in the phosphate solution are heated to enter the surface of the lens portion 121 by thermal diffusion.

Further, in some embodiments, when the filtering material is distributed in the optical liquid 122 in the filtering lens 120 or distributed in the whole lens portion 121, the filtering material is uniformly distributed in the lens portion 121. Therefore, each part of the filter lens 120 can have similar filtering performance to better filter out the interference light. It should be noted that, in the present application, when it is described that the filtering substance is uniformly distributed in the lens portion 121, it does not mean that the densities of the filtering substance in different portions of the lens portion 121 are completely the same. In the actual production and use process, due to the influence of factors such as precipitation, there may be a certain deviation in the density of the filtering material in different parts of the lens portion 121, and as long as the density of the filtering material in different parts of the lens portion 121 is not greatly different, that is, there is no uneven area where the filtering material is distributed very little or very much, the filtering material can be considered to be uniformly distributed in the lens portion 121.

Furthermore, in some embodiments, the filter lens 120 may further include a filter layer (not shown), and the filter layer and the filter material can absorb light in the same wavelength band and transmit light in the remaining wavelength bands. For example, in some embodiments, the filter layer is an infrared cut filter layer capable of absorbing light in the infrared band and transmitting light in the visible band. Therefore, the filtering film layer can be matched with the filtering material, and the filtering performance of the filtering lens 120 is further improved.

Referring to fig. 5, in some embodiments, the optical system 100 can be assembled with a photosensitive element 210 to form an imaging module 200, the photosensitive element 210 has a photosensitive surface, and the photosensitive element 210 can receive an image formed on the photosensitive surface. At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the image forming surface 130 of the optical system 100, and the light is adjusted by the optical system 100 to form an image on the photosensitive surface of the photosensitive element 210. Specifically, the light sensing element 210 may be a Charge Coupled Device (CCD) or a complementary metal oxide semiconductor device (CMOS). By adopting the optical system 100 in the imaging module 200, the imaging module 200 can have a filtering function without additionally configuring a filter, so that the size of the imaging module 200 can be reduced, and the assembling steps of the imaging module 200 are reduced, so that the assembly of the imaging module 200 is easier.

Referring to fig. 2, 3 and 4, the imaging module 200 may be mounted in a housing 310 of an electronic device 300. Specifically, the electronic apparatus 300 may be, but is not limited to, a wearable device such as a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image capturing apparatus such as a car recorder, or a smart watch. By adopting the imaging module 200 in the electronic device 300, the electronic device 300 can have the function of filtering out interference light without additionally configuring an optical filter, so that the size of the imaging module 200 in the electronic device 300 is reduced, the electronic device 300 can be more easily miniaturized, and the electronic device 300 can be more easily assembled.

More specifically, in some embodiments, the imaging module 200 is disposed on the lens barrel 311 of the housing 310, and the electronic device 300 further includes a circuit board 320, the photosensitive element 210 is disposed on the circuit board 320, and the circuit board 320 transmits the image received by the photosensitive element 210. In the optical system 100, when the relative positions of the filter lens 120 and the imaging lens 111 are different, the arrangement of the filter lens 120 and the imaging lens 111 on the lens barrel 311 of the housing 310 can be selected differently. For example, referring to fig. 2, in some embodiments, the filter lens 120 is disposed on the image side of the imaging lens 111, in which case, a portion of the lens barrel 311 close to the circuit board 320 may extend to form a bracket for fixing the filter lens 120, and the imaging lens 111 is fixed in the lens barrel 311 by gluing or the like. As shown in fig. 3, when the filter lens 120 is disposed on the object side of the imaging lens 111, the lens barrel 311 is provided with an entrance hole 312, and light enters the optical system 100 from the entrance hole 312. At this time, the filter lens 120 may be disposed outside the lens barrel 311 and cover the light entrance hole 312, so that the filter lens 120 can filter the interference light at the light entrance hole 312 to prevent the interference light from entering the optical system 100 and interfering with normal imaging. In addition, referring to fig. 4, when the filter lens 120 is disposed between two of the imaging lenses 111 of the lens group 110, the filter lens 120 and the imaging lenses 111 of the lens group 110 can be in a cemented state and fixed together in the lens barrel 311.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical system, comprising a lens set, wherein the lens set comprises at least one filter lens, the filter lens comprises a lens portion and a filter material distributed in the lens portion, the lens portion has refractive power, and the filter material can absorb light in a partial waveband and transmit light in the rest wavebands.

2. The optical system of claim 1, wherein the lens portion is a solid lens or a liquid lens with adjustable focal length.

3. The optical system of claim 2, wherein when the lens portion is a liquid lens, a liquid storage cavity is disposed in the lens portion, an optical liquid is disposed in the liquid storage cavity, the optical liquid provides the lens portion with refractive power, and the optical filtering material is distributed in the optical liquid.

4. The optical system of claim 3, wherein the optical liquid includes two mutually immiscible solutions, one is a conductive solution and the other is an oily insulating solution, an interface is formed between the conductive solution and the insulating solution, the shape of the interface between the conductive solution and the insulating solution can be changed by changing the magnitude of the voltage applied to the lens portion to change the focal length of the lens portion, and the filter material is distributed in the conductive solution and the insulating solution; or

The liquid storage cavity is used for drawing out or filling in the optical liquid, and the volume of the optical liquid in the liquid storage cavity can be changed by drawing out or filling in the optical liquid so as to change the focal length of the lens part.

5. The optical system according to claim 2, wherein when the lens portion is a solid lens, the lens portion is composed of a solid material, and the filter substance is doped in the solid material constituting the lens portion.

6. The optical system of claim 5, wherein the filter substance is uniformly distributed in the lens portion.

7. The optical system of claim 2, wherein when the lens portion is a solid lens, the filter substance is distributed in a portion of the lens portion near the outer surface.

8. The optical system according to any one of claims 1 to 7,

The lens group further comprises at least two imaging lenses with refractive power, and the filter lens is arranged between the two imaging lenses.

9. An imaging module comprising a photosensitive element and the optical system of any one of claims 1-8, wherein the photosensitive element is disposed on an image side of the optical system.

10. An electronic device comprising a housing and the imaging module of claim 9, the imaging module disposed within the housing.