CN210776001U - Optical imaging system, image capturing device and electronic equipment - Google Patents
Optical imaging system, image capturing device and electronic equipment Download PDFInfo
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- CN210776001U CN210776001U CN201921816284.6U CN201921816284U CN210776001U CN 210776001 U CN210776001 U CN 210776001U CN 201921816284 U CN201921816284 U CN 201921816284U CN 210776001 U CN210776001 U CN 210776001U
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Abstract
The utility model provides an optical imaging system, it includes in proper order to look like the survey by the thing side: a light filter film, a lens group and an antireflection film; the lens group comprises a first lens … … and an Nth lens which are sequentially arranged at intervals, wherein N is a non-zero natural number; the filter film is covered on the object side surface of the first lens; the antireflection film is covered on the image side surface of the Nth lens. The utility model discloses an optical imaging system covers the filter coating in the object side of first lens, covers the antireflection coating in the image side of last lens simultaneously, when guaranteeing optical imaging system formation of image quality for optical imaging system is more miniaturized, and the equipment process is simplified more. The utility model also provides an get for instance device and electronic equipment.
Description
Technical Field
The utility model relates to an optical imaging technique, in particular to optical imaging system, get for instance device and electronic equipment.
Background
In a conventional optical imaging system, a lens and a filter are generally separately stacked. Therefore, in the assembly process, the lens and the filter need to be assembled separately, which increases the number of assembly steps. In addition, the height of the optical imaging system is increased due to the presence of the optical filter, which in turn limits the size of the imaging area on the chip.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide an optical imaging system, which can reduce the assembling process of the optical imaging system, and can reduce the assembling height of the optical imaging system, thereby facilitating the miniaturization of the optical imaging system.
An optical imaging system comprising, in order from object side to image side: a light filter film, a lens group and an antireflection film; the lens group comprises a first lens … … and an Nth lens which are sequentially arranged at intervals, wherein N is a non-zero natural number; the filter film is covered on the object side surface of the first lens; the antireflection film is covered on the image side surface of the Nth lens.
The object side surface of the first lens of the optical imaging system is usually a simple convex lens, the curve is flat, and the surface area is small, so that the filter coating is plated on the object side surface of the first lens, so that the preparation process of the whole optical imaging system is simpler and more convenient and is easy to realize. The antireflection film is arranged on the image side surface of the Nth lens of the optical imaging system, so that the light path of the whole optical imaging system cannot be influenced, the light passing through the Nth lens directly reaches the surface of the sensor, and the light energy is prevented from being attenuated through other media, so that the imaging is influenced. Meanwhile, the optical filter can absorb light in certain wavelength ranges to darken an object, so that the increase of the antireflection film can play an antireflection role and strengthen the intensity of light penetrating through the optical imaging system.
Wherein the thickness of the filter film is an odd multiple of 1/4 of the wavelength of the allowable transmission light. Therefore, the optical imaging system can achieve a good light filtering effect, the imaging quality of the optical imaging system is better, the integral thickness of the optical imaging system can be effectively controlled, and the miniaturization is facilitated.
The light filtering film is an infrared light filtering film, an ultraviolet light filtering film or a visible light filtering film. Through the selection of the filter film, the requirements of the optical imaging system on various imaging qualities can be met.
When the filter film is an infrared filter film, the thickness of the infrared filter film is 570nm-750 mu m;
when the light filtering film is an ultraviolet light filtering film, the thickness of the ultraviolet light filtering film is 150 nm-300 nm;
when the filter film is a visible light filter film, the thickness of the visible light filter film is 285 nm-585 nm. Therefore, the optical imaging system can achieve a good light filtering effect, the imaging quality of the optical imaging system is better, the integral thickness of the optical imaging system can be effectively controlled, and the miniaturization is facilitated.
When the filter film is an infrared filter film, the antireflection film is a visible light antireflection film; when the filter film is a visible light filter film, the antireflection film is an infrared antireflection film; when the light filtering film is an ultraviolet light filtering film, the antireflection film is a visible light and infrared light antireflection film. The type of the antireflection film is selected according to the type of the filter film, so that the optical imaging system can have better imaging quality.
When the antireflection film is a visible light antireflection film, the thickness of the visible light antireflection film is 95-185 nm;
when the antireflection film is an infrared antireflection film, the thickness of the infrared antireflection film is 190 nm-250 um;
when the antireflection film is a visible light and infrared light antireflection film, the thickness of the visible light and infrared light antireflection film is 95 nm-250 um.
When the thickness of the anti-reflection film is within the range, the anti-reflection effect is better, and the later image is brighter.
Wherein the thickness of the antireflection film is 1/4 of the wavelength of light which can be transmitted through the antireflection film. When the thickness of the antireflection film is 1/4 that can transmit light wavelength, light reflected back from two sides of the antireflection film can better interfere with each other, so that the light to be antireflection can completely pass through the antireflection film.
When the lens assembly only comprises the first lens, the filter film and the antireflection film respectively cover the object side surface and the image side surface of the first lens. The filter film and the antireflection film are arranged in the optical imaging system with only one lens, so that the optical imaging system has better imaging quality and is more miniaturized.
The utility model also provides a get for instance device, it includes:
the optical imaging system described above; and
and the photosensitive element is positioned on an imaging surface of the optical imaging system.
The utility model also provides an electronic equipment, it includes:
an apparatus main body and;
the image capturing device is mounted on the main body of the apparatus.
Therefore, the utility model discloses an optical imaging system covers the filtering membrane in the object side of first lens, covers the antireflection coating in the image side of last lens simultaneously, when guaranteeing optical imaging system formation of image quality for optical imaging system is more miniaturized, and the equipment process is simplified more.
Drawings
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of an optical imaging system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an optical imaging system according to still another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an image capturing device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
The optical filter can be divided into an ultraviolet filter, a visible filter and an infrared filter according to spectral bands. The filter may allow light of certain wavelength ranges to pass through the filter and filter light of certain wavelength ranges to act as a monochromator, but it is impossible to obtain monochromatic light.
An infrared cut filter (also called infrared filter or heat absorption filter) is a filter used for filtering infrared wave band.
The ultraviolet cut filter (also called ultraviolet filter) refers to a filter which is not penetrated by ultraviolet light, mainly absorbs ultraviolet light with the wavelength of below 400nm, and has no filtering effect on other visible/invisible light rays. I.e. the ultraviolet light is cut off and visible and near infrared light is transmitted.
The visible cut-off filter (also called visible filter) refers to a filter which is absorbed at the wavelength of 380 nm-780 nm and is transparent to other wavelengths of light. I.e. white light is cut off and infrared light is transmitted. Anti-Reflective coating (AR) is a surface optical coating that increases the transmission of light at the surface by reducing the reflected light. The antireflection film utilizes the principle of light interference to enable light reflected by the front surface and the back surface of the film to generate interference effect.
Referring to fig. 1, the optical imaging system 100 of the present invention includes, in order from an object side to an image side, a filter 10, a lens set 30, and an antireflection film 50. The lens group 30 includes first lenses L1, … … arranged in sequence at intervals, and an nth lens LN, N is a non-zero natural number. The filter 10 covers the object-side surface S1 of the first lens element L1, and the anti-reflection film 50 covers the image-side surface SN' of the nth lens element LN.
The object-side surface S1 of the first lens L1 of the optical imaging system 100 is generally a simple convex lens with a flat curve and a small surface area, and therefore the filter film 10 is coated on the object-side surface S1 of the first lens L1, so that the whole manufacturing process of the optical imaging system 100 is simpler and easier to implement. The antireflection film 50 is disposed on the image side SN' of the nth lens LN of the optical imaging system, so that the optical path of the entire optical imaging system 100 is not affected, and the light passing through the nth lens LN directly reaches the surface of the sensor, and does not pass through another medium, thereby avoiding attenuation of light energy, and thus affecting imaging. Meanwhile, since the optical filter 10 absorbs light in a certain wavelength range to darken an object, the addition of the antireflection film can play an antireflection role to enhance the intensity of light transmitted through the optical imaging system 100.
In some embodiments, the thickness of the filter 10 is an odd multiple of 1/4 of the wavelength of light that the filter 10 allows transmission. The filter film 10 includes, but is not limited to, an infrared filter film, an ultraviolet filter film, and a visible light filter film. In some embodiments, when the filter 10 is an infrared filter, the thickness of the infrared filter 10 is 570nm to 750 um. In some embodiments, when the filter is an ultraviolet filter, the thickness of the ultraviolet filter 10 is 150nm to 300 nm. In some embodiments, when the filter is a visible light filter, the thickness of the visible light filter 10 is 285nm to 585 nm. Therefore, a good light filtering effect can be achieved, the imaging quality of the optical imaging system 100 is better, the overall thickness of the optical imaging system 100 can be effectively controlled, and the miniaturization is facilitated.
In some embodiments, when the filter 10 is an infrared filter, the antireflection film 50 is a visible light antireflection film. When the filter 10 is a visible light filter, the antireflection film 50 is an infrared antireflection film. When the filter film 10 is an ultraviolet filter film, the antireflection film 50 is a visible light and infrared light antireflection film. The type of the antireflection film 50 is selected according to the type of the filter film 10, so that the optical imaging system can have better imaging quality.
In some embodiments, antireflection film 50 has a thickness of 1/4, which is the wavelength of the light that is transmitted. When the thickness of the antireflection film 50 is 1/4 that can transmit light with a wavelength, light reflected from both sides of the antireflection film 50 can better interfere with each other, so as to cancel each other out, and light to be antireflection can completely pass through the antireflection film 50.
More specifically, when the antireflection film 50 is a visible light antireflection film, the thickness of the visible light antireflection film 50 is 95nm to 185 nm. When the antireflection film 50 is an infrared antireflection film, the thickness of the infrared antireflection film is 190nm to 250 um. When the anti-reflection film 50 is a visible light and infrared light anti-reflection film, the thickness of the visible light and infrared light anti-reflection film is 95 nm-250 um. This ensures a good anti-reflection effect and also allows a good control of the thickness of the optical imaging system 100.
Referring to fig. 2, in some embodiments, when the lens assembly 30 includes only the first lens element L1, the filter 10 and the antireflection film 50 respectively cover the object-side surface S1 and the image-side surface S1' of the first lens element L1. The filter film and the antireflection film are arranged in the optical imaging system with only one lens, so that the optical imaging system has better imaging quality and is more miniaturized.
In some embodiments, the number of lens groups 30 includes 2, 3, or 4 lenses. When the number of the plurality of lens groups 30 is the above number, the imaging quality of the optical imaging system can be ensured, and the miniaturization of the optical imaging system is facilitated.
Referring to fig. 3, the present invention further provides an image capturing device 200, which includes the optical imaging system 100 and the photosensitive element 210 of the present invention. The photosensitive element 210 is located on the imaging surface of the optical imaging system 100.
The photosensitive element 210 of the present invention is a photosensitive coupling element (CCD) or a Complementary Metal-Oxide Semiconductor (cmos) element.
For the description of other features of the image capturing apparatus 200, please refer to the description of the above embodiments, which is not repeated herein.
Referring to fig. 4, the present invention further provides an electronic device 300, which includes a device main body 310 and the image capturing device 200 according to the embodiment of the present invention. The orientation device 200 is mounted on the apparatus body 310.
The utility model discloses an electronic equipment 300 includes but not limited to computer, notebook computer, panel computer, cell-phone, camera, intelligent bracelet, intelligent wrist-watch, intelligent glasses etc..
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An optical imaging system, comprising, in order from an object side to an image side: a light filter film, a lens group and an antireflection film; the lens group comprises a first lens … … and an Nth lens which are sequentially arranged at intervals, wherein N is a non-zero natural number; the filter film is covered on the object side surface of the first lens; the antireflection film is covered on the image side surface of the Nth lens.
2. The optical imaging system of claim 1, wherein the thickness of the filter film is an odd multiple of 1/4 of the wavelength of the light that it can allow to pass through.
3. The optical imaging system of claim 1, wherein the filter is an infrared filter, an ultraviolet filter, or a visible light filter.
4. The optical imaging system of claim 3, wherein when the filter is an infrared filter, the infrared filter has a thickness of 570nm to 750 μ ι η;
when the light filtering film is an ultraviolet light filtering film, the thickness of the ultraviolet light filtering film is 150 nm-300 nm; when the filter film is a visible light filter film, the thickness of the visible light filter film is 285 nm-585 nm.
5. The optical imaging system of claim 1, wherein when the filter is an infrared filter, the antireflective film is a visible light antireflective film;
when the filter film is a visible light filter film, the antireflection film is an infrared antireflection film;
when the light filtering film is an ultraviolet light filtering film, the antireflection film is a visible light and infrared light antireflection film.
6. The optical imaging system of claim 5, wherein when the antireflective film is a visible light antireflective film, the visible light antireflective film has a thickness of 95nm to 185 nm;
when the antireflection film is an infrared antireflection film, the thickness of the infrared antireflection film is 190 nm-250 um;
when the antireflection film is a visible light and infrared light antireflection film, the thickness of the visible light and infrared light antireflection film is 95 nm-250 um.
7. The optical imaging system of claim 1, wherein the antireflective film is 1/4 thick at the wavelength of light it is transparent to.
8. The optical imaging system of claim 1, wherein when the lens assembly includes only the first lens, the filter and the anti-reflection film respectively cover an object-side surface and an image-side surface of the first lens.
9. An image capturing apparatus, comprising:
the optical imaging system of any one of claims 1-8; and
and the photosensitive element is positioned on an imaging surface of the optical imaging system.
10. An electronic device, comprising:
an apparatus main body and;
the image capturing device as claimed in claim 9, wherein the image capturing device is mounted on the main body of the apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921816284.6U CN210776001U (en) | 2019-10-25 | 2019-10-25 | Optical imaging system, image capturing device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921816284.6U CN210776001U (en) | 2019-10-25 | 2019-10-25 | Optical imaging system, image capturing device and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210776001U true CN210776001U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921816284.6U Active CN210776001U (en) | 2019-10-25 | 2019-10-25 | Optical imaging system, image capturing device and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN210776001U (en) |
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- 2019-10-25 CN CN201921816284.6U patent/CN210776001U/en active Active
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Address after: 510660 No.7, Shenzhou Road, Science City, high tech Industrial Development Zone, Guangzhou City, Guangdong Province Patentee after: Guangzhou delta Imaging Technology Co.,Ltd. Address before: 510660 No.7, Shenzhou Road, Science City, high tech Industrial Development Zone, Guangzhou City, Guangdong Province Patentee before: O-FILM IMAGE TECHNOLOGY (GUANGZHOU) Co.,Ltd. |