Patent Description:
In recent years, the portable electronic devices have developed rapidly. For example, the intelligent electronic devices and the tablets have been filled in the lives of modern people, and the camera modules employed in the portable electronic devices have also prospered. However, as technology advances, the quality requirements of the camera modules are becoming higher and higher.

Please refer to <FIG>, which is a schematic view of a camera module <NUM> of the conventional art. In the conventional art, when an imaging light enters the camera module <NUM>, an optical plate <NUM> of the camera module <NUM> will reflect the imaging light and generate the stray lights, and at least three light paths of the stray lights P1, P2, P3 will be generated, but is not limited thereto. When the imaging light enters the camera module <NUM>, the imaging light will be reflected by the optical plate <NUM>, and then the imaging light will be reflected by an imaging lens element <NUM> and generates an optical surface reflection or an optical surface total reflection, and the stray light P1 will be generated on an optical image. When the imaging light enters the camera module <NUM>, the imaging light will pass through the optical plate <NUM> and generates a secondary reflection in the optical plate <NUM>, and then the stray light P2 will be generated on the optical image. When the imaging light enters the camera module <NUM>, the imaging light will be diffracted by a micro lens of an image sensor <NUM>, and then the imaging light will be reflected by the optical plate <NUM>, finally, the stray light P3 will be generated on an optical image. For example, the reference <CIT> discloses an imaging device capable of miniaturization and reduction in height of a device configuration, reduction in generation of flare or ghosting. Furthermore, the references <CIT> and <CIT> disclose an optical member having an antireflection effect on the substrate. Moreover, the reference <CIT> discloses an optical element that has an anti-reflection film formed on a substrate. The reference <CIT> discloses an imaging optical system and imaging device, wherein transmission of ultraviolet rays and a color change of a resin material are suppressed by arranging UV-cutting coat on a resin lens. Therefore, the development of a camera module which can effectively eliminate the stray lights has become an important and urgent issue in the industry.

According to one aspect of the present disclosure, a camera module includes an imaging lens assembly, an image sensor and an optical plate. The image sensor is disposed on an image surface of the imaging lens assembly. The optical plate is disposed between the imaging lens assembly and the image sensor, and includes a substrate and at least one anti-reflection layer. The substrate has an object-side surface and an image-side surface, the object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The at least one anti-reflection layer is disposed on the image-side surface of the substrate, the at least one anti-reflection layer includes a nanocrystal structure layer and an optical-connecting layer, wherein the nanocrystal structure layer includes a metal oxide crystal, the optical-connecting layer connects the substrate and the nanocrystal structure layer, and the nanocrystal structure layer is physically contacted with the optical-connecting layer. An upper side of the optical-connecting layer is partly contacted with air. When a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf, a height of the nanocrystal structure layer is Hc, a thickness of the optical-connecting layer is Hf, and a total height of the anti-reflection layer is H, the following conditions are satisfied: Nf < Nc; Hf+Hc=H; and Hf < Hc.

According to the camera module of the foregoing aspect, a number of the at least one anti-reflection layer is two which are disposed on the object-side surface and the image-side surface of the substrate, respectively.

According to the camera module of the foregoing aspect, the optical plate is a polarizer.

According to the camera module of the foregoing aspect, an image-side optical surface of the imaging lens assembly is an optical aspheric surface, and the optical aspheric surface has at least one inflection point.

According to the camera module of the foregoing aspect, when the thickness of the optical-connecting layer is Hf, the following condition is satisfied: <NUM> < Hf < <NUM>. Further, the following condition is satisfied: <NUM> < Hf < <NUM>.

According to the camera module of the foregoing aspect, when the material refractive index of the nanocrystal structure layer is Nc, and a material refractive index of the substrate is Ns, the following condition is satisfied: Ns < Nc.

According to the camera module of the foregoing aspect, when the height of the nanocrystal structure layer is Hc, the following condition is satisfied: <NUM> < Hc < <NUM>. Further, the following condition is satisfied: <NUM> < Hc < <NUM>.

According to the camera module of the foregoing aspect, the nanocrystal structure layer is arranged irregularly.

According to the camera module of the foregoing aspect, the substrate of the optical plate is a glass substrate.

According to one aspect of the present disclosure, an electronic device includes the camera module of the aforementioned aspect.

According to one aspect of the present disclosure, a camera module includes an imaging lens assembly, an image sensor and an optical plate. The image sensor is disposed on an image surface of the imaging lens assembly. The optical plate is disposed between the imaging lens assembly and the image sensor, and includes a substrate and at least one anti-reflection layer. The substrate has an object-side surface and an image-side surface, the object-side surface faces towards an object side, the image-side surface faces towards an image side, the object-side surface is parallel with the image-side surface. The at least one anti-reflection layer is disposed on the object-side surface of the substrate, the at least one anti-reflection layer includes a nanocrystal structure layer and an optical-connecting layer, wherein the nanocrystal structure layer includes a metal oxide crystal, the optical-connecting layer connects the substrate and the nanocrystal structure layer, and the nanocrystal structure layer is physically contacted with the optical-connecting layer. An upper side of the optical-connecting layer is partly contacted with air. When a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf, a height of the nanocrystal structure layer is Hc, a thickness of the optical-connecting layer is Hf, and a total height of the anti-reflection layer is H, the following conditions are satisfied: Nf < Nc; Hf+Hc=H; and Hf < Hc.

According to the camera module of the foregoing aspect, the optical plate is an infrared filter.

The present disclosure provides a camera module which includes an imaging lens assembly, an image sensor and an optical plate. The image sensor is disposed on an image surface of the imaging lens assembly. The optical plate is disposed between the imaging lens assembly and the image sensor, and includes a substrate and at least one anti-reflection layer. The substrate has an object-side surface and an image-side surface, the object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The anti-reflection layer is disposed on the object-side surface or the image-side surface of the substrate and includes a nanocrystal structure layer and an optical-connecting layer. The nanocrystal structure layer includes a metal oxide crystal. The optical-connecting layer connects the substrate and the nanocrystal structure layer, and the nanocrystal structure layer is physically contacted with the optical-connecting layer. When a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf, a height of the nanocrystal structure layer is Hc, a thickness of the optical-connecting layer is Hf, and a total height of the anti-reflection layer is H, the following conditions are satisfied: Nf < Nc; Hf+Hc=H; and Hf < Hc. Therefore, it is favorable for reducing the stray lights of the camera module by disposing the anti-reflection layer on the optical plate so as to enhance the image quality. Further, it is favorable for enhancing the transmittance of the optical plate by using the nanocrystal structure layer with higher material refractive index as an outer layer of the optical plate so as to reduce the reflective lights of the optical plate. Moreover, it will be easier for the nanocrystal structure layer to deposit on the optical plate by the arrangement of the optical-connecting layer.

In the present disclosure, the material refractive index represents the material refractive index of the material which is presented in the form of an optical flat layer. Further, when the material is formed into a layer of a nanocrystal structure, part of the volume of the layer will be substituted by the air due to the shape of the nanocrystal structure, and an equivalent material refractive index of the entire layer will change in the direction of <NUM> according to the density of the nanocrystal structure.

During the manufacturing process, it is favorable for enhancing the structural stability of the anti-reflection layer by plating the optical-connecting layer on the substrate first, and then plating the nanocrystal structure layer. There is no gap between the upper side of the optical-connecting layer and the bottom side of the nanocrystal structure layer, and both of the layers are connected tightly. The nanocrystal structure layer is not formed as a complete plane. Therefore, it is favorable for contacting parts of the optical-connecting layer with the air.

A number of the anti-reflection layer can be two, and the anti-reflection layers are disposed on the object-side surface and the image-side surface of the substrate, respectively. By using the double-sided coating technology, both of the object-side surface and the image-side surface of the optical plate are coated with the anti-reflection layer, so that the reflective lights of the optical plate can be more effectively reduced.

In detail, the optical plate can be an infrared light filter (IR filter), a blue glass (BG), a polarizer, a liquid crystal display (LCD) panel, a neutral density filter (ND filter) and a Fresnel lens. When the optical plate is the polarizer, it is favorable for obtaining the function of light filtering by absorbing the light with specific electric field directions. When the optical plate is the IR filter, it is favorable for filtering the infrared light.

An image-side optical surface of the imaging lens assembly can be an optical aspheric surface, and the optical aspheric surface has at least one inflection point. Therefore, it is favorable for providing the imaging lens assembly with higher optical specification.

When the thickness of the optical-connecting layer is Hf, the following condition is satisfied: <NUM> < Hf < <NUM>. Therefore, it is favorable for enhancing the plating yield rate of the nanocrystal structure layer and enhancing the optical transmittance by arranging the optical-connecting layer with specific thickness range. Further, the following condition can be satisfied: <NUM> < Hf < <NUM>. Therefore, it is favorable for providing the thickness range with better uniformity.

When the material refractive index of the nanocrystal structure layer is Nc, and a material refractive index of the substrate is Ns, the following condition is satisfied: Ns < Nc. Therefore, it is favorable for reducing the secondary reflection in the optical plate by cooperating the substrate with low material refractive index with the nanocrystal structure layer with high material refractive index.

When the height of the nanocrystal structure layer is Hc, the following condition is satisfied: <NUM> < Hc < <NUM>. Therefore, it is favorable for enhancing a height range of the transmittance by cooperating the nanocrystal structure layer with the optical-connecting layer. Further, the following condition can be satisfied: <NUM> < Hc < <NUM>. Therefore, it is favorable for providing a nanocrystal with evener size and also providing higher coating quality.

The nanocrystal structure layer can be arranged irregularly, which can be a non-periodic arrangement. Therefore, it is favorable for avoiding the optical diffraction generated from the nanocrystal structure layer by the non-periodic arrangement, so that the actual light path of the imaging light can further meet the predetermined light path.

The substrate of the optical plate can be a glass substrate. Therefore, it is easier for the mass production.

The imaging lens assembly can be a main lens assembly, a telephoto lens assembly or a wide angle lens assembly. The camera module can be a vehicle camera module, a portable device camera module or a head-mounted device camera module, but is not limited thereto.

Each of the aforementioned features of the camera module can be combined with each other and reach the corresponded effect.

The present disclosure provides an electronic device which includes the aforementioned camera module. Therefore, it is favorable for enhancing the image quality.

According to the aforementioned embodiment, specific examples with figures are provided as follows.

<FIG> is a schematic view of a camera module <NUM> according to the 1st embodiment of the present disclosure. <FIG> shows a part of the light paths of the camera module <NUM> according to <FIG> of the 1st embodiment. In <FIG>, the camera module <NUM> includes an imaging lens assembly <NUM>, an optical plate <NUM>, and an image sensor <NUM>. The camera module <NUM> includes, in order from an object side to an image side along an optical axis X, the imaging lens assembly <NUM>, the optical plate <NUM>, and the image sensor <NUM>. The image sensor <NUM> is disposed on an image surface <NUM> of the imaging lens assembly <NUM>. The optical plate <NUM> is disposed between the imaging lens assembly <NUM> and the image sensor <NUM>. Therefore, as shown in <FIG>, it is favorable for reducing the reflectivity by the arrangement of the optical plate <NUM> so as to reduce the stray light.

The imaging lens assembly <NUM> can be disposed in a lens barrel <NUM> and include a plurality of lens elements. The lens element which is closest to the image side of the camera module <NUM> is a most image side lens element <NUM>, and an image-side surface of the most image side lens element <NUM> is an image-side optical surface <NUM> of the imaging lens assembly <NUM>. The image-side optical surface <NUM> is an optical aspheric surface, and the optical aspheric surface has at least one inflection point IP. Further, other optical elements can be disposed in the lens barrel <NUM> according to specific requirements, for example, a light blocking sheet, a spacer, a retainer, etc., and will not be described herein.

The optical plate <NUM> includes a substrate <NUM> and at least one anti-reflection layer <NUM>. The substrate <NUM> has an object-side surface and an image-side surface. The object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The anti-reflection layer <NUM> is disposed on at least one of the object-side surface and the image-side surface of the substrate <NUM>. <FIG> is a schematic view of the optical plate <NUM> according to the 1st example of the 1st embodiment of the present disclosure. In <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two, which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, in the 1st example of the 1st embodiment, the optical plate <NUM> can be an infrared filter which can further include an infrared filter layer <NUM>. The infrared filter layer <NUM> is disposed between the image-side surface of the substrate <NUM> and the optical-connecting layer <NUM> of the anti-reflection layer <NUM>. In the anti-reflection layer <NUM> of the object-side surface of the substrate <NUM>, the optical-connecting layer <NUM> connects the substrate <NUM> and the nanocrystal structure layer <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layer <NUM>. The substrate <NUM> can be a glass substrate, each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide, the infrared filter layer <NUM> can absorb the infrared light and reflect the infrared light, but is not limited thereto.

In the 1st example of the 1st embodiment, when a material refractive index of the substrate <NUM> is Ns, a material refractive index of the nanocrystal structure layers <NUM> is Nc, a material refractive index of the optical-connecting layers <NUM> is Nf, a height of the nanocrystal structure layers <NUM> is Hc, a thickness of the optical-connecting layers <NUM> is Hf, and a total height of the anti-reflection layer <NUM> is H, the detailed optical data of the 1st example of the 1st embodiment are shown in Table <NUM>.

According to Table <NUM>, the following conditions of the 1st example of the 1st embodiment are satisfied: Nf < Nc; Hf+Hc=H; Hf < Hc; and Ns < Nc. It should be noted that, other examples of the 1st embodiment are also satisfied with the aforementioned conditions, and the actual parameter values can be the same or different from Table <NUM>, and will not describe in the following examples.

<FIG> shows an electron microscope picture of the nanocrystal structure layer <NUM> on the optical plate <NUM> in <FIG>, <FIG> shows another electron microscope picture of the nanocrystal structure layer <NUM> on the optical plate <NUM> in <FIG>. In <FIG>, <FIG> and <FIG>, the nanocrystal structure layers <NUM> are arranged irregularly. Therefore, it is favorable for avoiding the optical diffraction generated from the nanocrystal structure layers <NUM> by the non-periodic arrangement, so that the actual light path of the imaging light can further meet the predetermined light path.

<FIG> shows an electron microscope picture of a cross-sectional view of the anti-reflection layer <NUM> in <FIG>, <FIG> shows another electron microscope picture of a cross-sectional view of the anti-reflection layer <NUM> in <FIG>. In <FIG>, when the height of the nanocrystal structure layers <NUM> is Hc, and the thickness of the optical-connecting layers <NUM> is Hf, the following conditions are satisfied: Hc = <NUM>; and Hf = <NUM>. In <FIG>, when the height of the nanocrystal structure layers <NUM> is Hc, and the thickness of the optical-connecting layers <NUM> is Hf, the following conditions are satisfied: Hc = <NUM>; and Hf = <NUM>. In <FIG>, <FIG> and <FIG>, there is no gap between the upper side of the optical-connecting layer <NUM> and the bottom side of the nanocrystal structure layer <NUM>, and both of the layers are connected tightly. The nanocrystal structure layers <NUM> are not formed as a complete plane. Therefore, it is favorable for contacting parts of the upper side of the optical-connecting layers <NUM> with the air. Furthermore, the optical-connecting layers <NUM> are plated on the substrate <NUM> first, and then the nanocrystal structure layers <NUM> are plated thereon. Therefore, the nanocrystal structure layers <NUM> can be deposited on the optical plate <NUM> easier by disposing the optical-connecting layers <NUM> so as to enhance the structural stability of the anti-reflection layer <NUM>.

According to different requirements, different optical plates <NUM> in the 2nd, 3rd, 4th, 5th, 6th examples are provided herein. In order to clearly describe, the optical plates <NUM> and the corresponding elements in the 2nd, 3rd, 4th, 5th, 6th examples are labeled with the same numbers, other elements and arrangements thereof in the 2nd, 3rd, 4th, 5th, 6th examples are the same with the 1st example of the 1st embodiment, and will not be described again herein.

<FIG> is a schematic view of an optical plate <NUM> according to the 2nd example of the 1st embodiment of <FIG>. In <FIG>, <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two, which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, according to the 2nd example of <FIG>, the substrate <NUM> can be a blue glass substrate which is favorable for absorbing the infrared light, and let the optical plate <NUM> being an infrared light filter. In the anti-reflection layers <NUM> of the object-side surface and the image-side surface of the substrate <NUM>, the optical-connecting layers <NUM> connect the substrate <NUM> and the nanocrystal structure layers <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layers <NUM>. Each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide.

<FIG> is a schematic view of an optical plate <NUM> according to the 3rd example of the 1st embodiment of <FIG>. In <FIG>, <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, according to the 3rd example of the 1st embodiment, the optical plate <NUM> can be a filter which can further include a polarizer layer <NUM>. The polarizer layer <NUM> is disposed between the object-side surface of the substrate <NUM> and the optical-connecting layer <NUM> of the anti-reflection layer <NUM>. In the anti-reflection layer <NUM> of the image-side surface of the substrate <NUM>, the optical-connecting layer <NUM> connects the substrate <NUM> and the nanocrystal structure layer <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layers <NUM>. The substrate <NUM> can be a glass substrate, each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide, the polarizer layer <NUM> can obtain the function of light filtering by absorbing the lights with specific electric field directions so as to filter the light, but is not limited thereto.

<FIG> is a schematic view of an optical plate <NUM> according to the 4th example of the 1st embodiment of <FIG>. In <FIG>, <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, according to the 4th example of the 1st embodiment, the substrate <NUM> can be a ND filter which is favorable for absorbing the light in specific proportion, and let the optical plate <NUM> being a filter which can absorb the light in specific proportion. In the anti-reflection layers <NUM> of the object-side surface and the image-side surface of the substrate <NUM>, the optical-connecting layers <NUM> connect the substrate <NUM> and the nanocrystal structure layers <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layers <NUM>. Each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide.

<FIG> is a schematic view of an optical plate <NUM> according to the 5th example of the 1st embodiment of <FIG>. In <FIG>, <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, according to the 5th example of the 1st embodiment, the substrate <NUM> can be a liquid crystal layer. Therefore, it is favorable for the liquid crystal layer to filter or transmit the light in specific electric field directions by tuning the voltage, and let the optical plate <NUM> be a filter. In the anti-reflection layers <NUM> of the object-side surface and the image-side surface of the substrate <NUM>, the optical-connecting layers <NUM> connect the substrate <NUM> and the nanocrystal structure layers <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layers <NUM>. Each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide.

<FIG> is a schematic view of an optical plate <NUM> according to the 6th example of the 1st embodiment of <FIG>. In <FIG>, <FIG> and <FIG>, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively. Each anti-reflection layer <NUM> includes a nanocrystal structure layer <NUM> and an optical-connecting layer <NUM>.

In detail, according to the 6th example of the 1st embodiment, the optical plate <NUM> can be a filter which can further include a Fresnel lens <NUM>. The Fresnel lens <NUM> is disposed between the object-side surface of the substrate <NUM> and the optical-connecting layer <NUM> of the anti-reflection layer <NUM>. In the anti-reflection layer <NUM> of the image-side surface of the substrate <NUM>, the optical-connecting layer <NUM> connects the substrate <NUM> and the nanocrystal structure layer <NUM>, and the nanocrystal structure layers <NUM> of both sides of the substrate <NUM> are physically contacted with the optical-connecting layer <NUM>. The substrate <NUM> can be a glass substrate, each of the nanocrystal structure layers <NUM> includes a metal oxide crystal, and the nanocrystal structure layers <NUM> are arranged irregularly. The optical-connecting layers <NUM> can be made of the silicon dioxide, and the Fresnel lens <NUM> is favorable for adjusting the angle of the light, but is not limited thereto.

<FIG> is a schematic view of a camera module <NUM> according to the 2nd embodiment of the present disclosure. In <FIG>, the camera module <NUM> includes an imaging lens assembly <NUM>, an optical plate <NUM>, and an image sensor <NUM>. The camera module <NUM> includes, in order from an object side to an image side along an optical axis X, the imaging lens assembly <NUM>, the optical plate <NUM>, and the image sensor <NUM>. The image sensor <NUM> is disposed on an image surface <NUM> of the imaging lens assembly <NUM>. The optical plate <NUM> is disposed between the imaging lens assembly <NUM> and the image sensor <NUM>. Therefore, it is favorable for reducing the reflectivity by disposing the optical plate <NUM> so as to reduce the stray light.

The camera module <NUM> can further include a light path folding element <NUM> which is disposed on a most object side of the imaging lens assembly <NUM>. Therefore, it is favorable for adjusting the light path and let the lights entering the image sensor <NUM> along the optical axis X.

The imaging lens assembly <NUM> can be disposed in a lens barrel <NUM> and include a plurality of lens elements. Further, other optical elements can be disposed in the lens barrel <NUM> according to specific requirements, for example, a light blocking sheet, a spacer, a retainer, etc., and will not be described herein.

The optical plate <NUM> includes a substrate <NUM> and at least one anti-reflection layer <NUM>. The substrate <NUM> has an object-side surface and an image-side surface. The object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The anti-reflection layer <NUM> is disposed on at least one of the object-side surface and the image-side surface of the substrate <NUM>. In the 2nd embodiment, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively.

The optical plate <NUM> of the camera module <NUM> in the 2nd embodiment can be any optical plate in the 1st, 2nd, 3rd, 4th, 5th, 6th examples of the 1st embodiment according to different requirements, but is not limited thereto.

In the 1st example of the 2nd embodiment, when a material refractive index of the substrate <NUM> is Ns, a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf, a height of the nanocrystal structure layer is Hc, a thickness of the optical-connecting layer is Hf, and a total height of the anti-reflection layers <NUM> is H, the detailed optical data of the 1st example of the 2nd embodiment are shown in Table <NUM>.

According to Table <NUM>, the following conditions of the 1st example of the 2nd embodiment can be satisfied: Nf < Nc; Hf+Hc=H; Hf < Hc; and Ns < Nc.

<FIG> is a schematic view of a camera module <NUM> according to the 3rd embodiment of the present disclosure. In <FIG>, the camera module <NUM> includes an imaging lens assembly <NUM>, an optical plate <NUM>, and an image sensor <NUM>. The camera module <NUM> includes, in order from an object side to an image side along an optical axis X, the imaging lens assembly <NUM>, the optical plate <NUM>, and the image sensor <NUM>. The image sensor <NUM> is disposed on an image surface <NUM> of the imaging lens assembly <NUM>. The optical plate <NUM> is disposed between the imaging lens assembly <NUM> and the image sensor <NUM>. Therefore, it is favorable for reducing the reflectivity by disposing the optical plate <NUM> so as to reduce the stray light.

The imaging lens assembly <NUM> can be disposed in a lens barrel <NUM> and include a plurality of lens elements. The lens elements are disposed in order from the object side to the image side along the optical axis X of the camera module <NUM>. The lens element which closest to the image side of the camera module <NUM> is a most image side lens element <NUM>, and an image-side surface of the most image side lens element <NUM> is an image-side optical surface <NUM> of the imaging lens assembly <NUM>. The image-side optical surface <NUM> is an optical aspheric surface, and the optical aspheric surface has at least one inflection point IP. Further, other optical elements can be disposed in the lens barrel <NUM> according to specific requirements, for example, a light blocking sheet, a spacer, a retainer, etc., and will not be described herein.

The optical plate <NUM> is disposed on an image side of the lens barrel <NUM>, and the optical plate <NUM> can be disposed on an image-side surface of the lens barrel <NUM>. The optical plate <NUM> includes a substrate <NUM> and at least one anti-reflection layer <NUM>. The substrate <NUM> has an object-side surface and an image-side surface. The object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The anti-reflection layer <NUM> is disposed on at least one of the object-side surface and the image-side surface of the substrate <NUM>. In the 3rd embodiment, a number of the anti-reflection layer <NUM> is two which are disposed on the object-side surface and the image-side surface of the substrate <NUM>, respectively.

The optical plate <NUM> of the camera module <NUM> in the 3rd embodiment can be any optical plate in the 1st, 2nd, 3rd, 4th, 5th, 6th examples of the 1st embodiment according to different requirements, but is not limited thereto.

In the 1st example of the 3rd embodiment, when a material refractive index of the substrate <NUM> is Ns, a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf, a height of the nanocrystal structure layer is Hc, a thickness of the optical-connecting layer is Hf, and a total height of the anti-reflection layers <NUM> is H, the detailed optical data of the 1st example of the 3rd embodiment are shown in Table <NUM>.

According to Table <NUM>, the following conditions of the 1st example of the 3rd embodiment can be satisfied: Nf < Nc; Hf+Hc=H; Hf < Hc; and Ns < Nc.

<FIG> is a schematic view of an electronic device <NUM> according to the 4th embodiment of the present disclosure. <FIG> is another schematic view of the electronic device <NUM> according to the 4th embodiment of the present disclosure. In <FIG> and <FIG>, the electronic device <NUM> in the 4th embodiment is a smart phone. The electronic device <NUM> includes a camera module (its reference numeral is omitted) and an image sensor (not shown). The image sensor is disposed on an image surface (not shown) of the camera module. The camera module includes a wide angle camera module <NUM>, a high resolution camera module <NUM>, and a telephoto camera module <NUM>.

Further, the telephoto camera module <NUM> can be any camera module in the 1st embodiment, the 2nd embodiment, and the 3rd embodiment, but is not limited thereto. Therefore, it is favorable for satisfying the mass production requirement and the appearance requirement in the electronic device market nowadays.

The user enters the shooting mode through a user interface <NUM> of the electronic device <NUM>. The user interface <NUM> in the 4th embodiment can be a touch screen with a touch control function, and the touch screen is for displaying the screen, and for adjusting the shooting angle manually so as to change the camera module. Finally, the camera module will converge the imaging light on the image sensor and output an electronic signal of the image to an image signal processor (ISP) <NUM>.

In <FIG>, in order to meet the camera specification of the electronic device <NUM>, the electronic device <NUM> can further include an optical anti-shake mechanism (not shown). Further, the electronic device <NUM> can further include at least one focusing assisting module (its reference numeral is omitted) and at least one sensing element (not shown). The focusing assisting module can be a flash module <NUM> which is favorable for compensating a color temperature, an infrared distance measurement component, and a laser focusing module, etc. The sensing element is favorable for sensing the physical momentum and the kinetic energy, for example, an accelerator, a gyroscope, and a Hall Effect Element so as to sense the shaking or the jitters applied by hands of the user or external environments, further, it is favorable for acquiring a better image quality by disposing the optical anti-shake mechanism and the focusing assisting module in the camera module of the electronic device <NUM>. Further, the electronic device <NUM> according to the present disclosure has a capturing function with multiple modes, for example, optimizing the selfies, high dynamic range (HDR) under a low light condition, <NUM> resolution recording, etc. Furthermore, the user can visually see a captured image on the shooting screen of the camera by the user interface <NUM>. Moreover, the user interface <NUM> is capable of operate the view finding range manually to achieve the autofocus function of what you see is what you get.

Further, the camera module, the image sensor, the optical anti-shake mechanism, the sensing element, and the focusing assisting module can be disposed on a Flexible Printed Circuitboard (FPC) (not shown). Therefore, it is favorable for shooting the pictures by connecting the image signal processor <NUM> with a connector (not shown) electrically. Current electronic devices such as smart phone have a tendency to be thinner and lighter. Therefore, it is favorable for satisfying the limited space mechanism design and the circuit layout requirement in the electronic devices by disposing the camera module and the related elements on the Flexible Printed Circuitboard, and using the connector to integrate the circuit to the main board of the electronic device so as to acquire a bigger allowance. On the other hand, it is favorable for the autofocus function of the camera to be controlled more flexible by the touch screen of the electronic device. In the 4th embodiment, the electronic device can include a plurality of sensing elements and a plurality of focusing assisting modules. The sensing elements and the focusing assisting modules are disposed on the Flexible Printed Circuitboard and another at least one Flexible Printed Circuitboard (not shown). Therefore, it is favorable for shooting the pictures by connecting the image signal processor <NUM> with a connector electrically. In other examples of the 4th embodiment (not shown), the sensing element and the focusing assisting module can be disposed on the main board of the electronic device or other forms of board according to the mechanism design and the circuit layout requirement.

Further, the electronic device <NUM> can further include, but not limited to a display unit, a control unit, a storage unit, a RAM, a ROM or other combinations.

<FIG> is a schematic view of a picture shot by the electronic device <NUM> according to <FIG> of the 4th embodiment. In <FIG>, it is favorable for capturing a wider angle photo by the wide angle camera module <NUM> so as to accommodate more scenes.

<FIG> is a schematic view of another picture shot by the electronic device <NUM> according to <FIG> of the 4th embodiment. In <FIG>, it is favorable for capturing a high resolution image in a limited range by the high resolution camera module <NUM> so as to meet the features of high resolution and low distortion.

<FIG> is a schematic view of another picture shot by the electronic device <NUM> according to <FIG> of the 4th embodiment. In <FIG>, the telephoto camera module <NUM> has high amplification function, which can capture the long distance image and amplify to the high amplification.

In <FIG>, it is favorable for zooming the image of the electronic device <NUM> by capturing the image in different focal lengths of the camera module with the image processing techniques.

<FIG> is a schematic view of an electronic device <NUM> according to the 5th embodiment of the present disclosure. In <FIG>, the electronic device <NUM> is a smart phone. The electronic device <NUM> includes a camera module (its reference numeral is omitted) and an image sensor (not shown). The image sensor is disposed on an image surface (not shown) of the camera module. The camera module includes ultra-wide angle camera modules <NUM>, <NUM>, wide angle camera modules <NUM>, <NUM>, telephoto camera modules <NUM>, <NUM>, <NUM>, <NUM>, and a TOF (Time-Of-Flight) module <NUM>. The TOF module <NUM> can be displaced to other imaging devices, but is not limited thereto.

Further, the telephoto camera modules <NUM>, <NUM>, <NUM>, <NUM> can be any camera module in the 1st embodiment, the 2nd embodiment, and the 3rd embodiment, but is not limited thereto. Therefore, it is favorable for satisfying the mass production requirement and the appearance requirement in the electronic device market nowadays.

Moreover, the telephoto camera modules <NUM>, <NUM> are favorable for folding the light path, but are not limited thereto.

In order to meet the camera specification of the electronic device <NUM>, the electronic device <NUM> can further include an optical anti-shake mechanism (not shown). Further, the electronic device <NUM> can further include at least one focusing assisting module (not shown) and at least one sensing element (not shown). The focusing assisting module can be a flash module <NUM> which is favorable for compensating a color temperature, an infrared distance measurement component, and a laser focusing module, etc. The sensing element is favorable for sensing the physical momentum and the kinetic energy, for example, an accelerator, a gyroscope, and a Hall Effect Element so as to sense the shaking or the jitters applied by hands of the user or external environments, further, it is favorable for acquiring a better image quality by disposing the optical anti-shake mechanism and the focusing assisting module in the camera module of the electronic device <NUM>. Further, the electronic device <NUM> according to the present disclosure has a capturing function with multiple modes, for example, optimizing the selfies, high dynamic range (HDR) under a low light condition, <NUM> resolution recording, etc..

Claim 1:
A camera module (<NUM>), comprising:
an imaging lens assembly (<NUM>);
an image sensor (<NUM>) disposed on an image surface (<NUM>) of the imaging lens assembly (<NUM>); and
an optical plate (<NUM>) disposed between the imaging lens assembly (<NUM>) and the image sensor (<NUM>), comprising:
a substrate (<NUM>) having an object-side surface and an image-side surface, the object-side surface facing towards an object side, the image-side surface facing towards an image side, and the object-side surface being parallel with the image-side surface; and
at least one anti-reflection layer (<NUM>) disposed on the image-side surface of the substrate (<NUM>), the at least one anti-reflection layer (<NUM>) comprising a nanocrystal structure layer (<NUM>) and an optical-connecting layer (<NUM>), wherein the nanocrystal structure layer (<NUM>) comprises a metal oxide crystal, the optical-connecting layer (<NUM>) connects the substrate (<NUM>) and the nanocrystal structure layer (<NUM>), the nanocrystal structure layer (<NUM>) is physically contacted with the optical-connecting layer (<NUM>), and an upper side of the optical-connecting layer (<NUM>) is partly contacted with air;
wherein a material refractive index of the nanocrystal structure layer (<NUM>) is Nc, a material refractive index of the optical-connecting layer (<NUM>) is Nf, a height of the nanocrystal structure layer (<NUM>) is Hc, a thickness of the optical-connecting layer (<NUM>) is Hf, a total height of the anti-reflection layer (<NUM>) is H, and the following conditions are satisfied: <MAT> <MAT> and <MAT>