TWI704386B - Image capturing apparatus - Google Patents

Abstract

An image capturing apparatus includes a cover plate, a first lens element, a second lens element, a third lens element, and a sensor arranged sequentially from an object side to an image side along an optical axis. The number of lens elements in the image capturing apparatus is only three. The image capturing apparatus satisfies: f/imgH ＜ 0.45, and 2 ＜ (OTL-d)/imgH ＜ 9, wherein f is an effective focal length of the image capturing apparatus, imgH is a maximum image height of the image capturing apparatus, OTL is a distance from an object to an image plane on the optical axis, and d is a thickness of the cover plate.

Description

Imaging device

The invention relates to an electronic device, and more particularly to an image capturing device.

Most of the biometric identification systems of electronic devices on the market today use the capacitance principle. Although it can reduce the size of the electronic device, the complicated circuit structure leads to high manufacturing costs, which makes the product unit price high and difficult to popularize. Although there are biometric systems that use optical imaging principles (such as fingerprint recognition, palmprint recognition or vein recognition, etc.), the existing optical imaging system has the problem of being too large, making the electronic device difficult to miniaturize and thin, and thus reducing the size of the electronic device Portability. Therefore, how to reduce the volume of the optical imaging system in the electronic device while maintaining good optical imaging quality has become an important goal of the industry's current research and development.

The present invention provides an image capturing device, which can realize thinning while maintaining good optical imaging quality.

An image capturing device of the present invention includes a cover plate, a first lens, a second lens, a third lens, and a sensor that are sequentially arranged along the optical axis from the object side to the image side. The number of lenses in the imaging device is only three. The imaging device satisfies: f/imgH <0.45 and 2 <(OTL-d)/imgH <9, where f is the effective focal length of the imaging device, imgH is the maximum imaging height of the imaging device, and OTL is the object to be measured to the imaging The distance of the surface on the optical axis, and d is the thickness of the cover plate.

In an embodiment of the present invention, the refractive powers of the first lens, the second lens, and the third lens are negative, positive, and negative in order. The first lens, the second lens and the third lens each have an object side surface and an image side surface. The object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, and the image side surface of the third lens are all aspherical. The image capturing device further includes an aperture arranged between the first lens and the second lens.

In an embodiment of the present invention, the image capturing device satisfies (OTL-d) <3.5 mm.

In an embodiment of the present invention, the refractive index of the first lens is N1, the refractive index of the second lens is N2, and the refractive index of the third lens is N3, and the imaging device satisfies 4.5 <N1+N2+N3 < 5.4.

In an embodiment of the present invention, the dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, and the dispersion coefficient of the third lens is V3, and the image capturing device further satisfies V1+V2+V3<75.

In an embodiment of the present invention, the entrance pupil aperture of the imaging device is EPD, and the imaging device satisfies f/EPD <3.7.

。In an embodiment of the present invention, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the imaging device is more satisfactory

.

In an embodiment of the present invention, the angle of view of the image capturing device is FOV, and the image capturing device satisfies 100˚<FOV<180˚.

In an embodiment of the present invention, the distance on the optical axis from the image side surface of the third lens to the imaging surface is greater than 0.29 mm.

In an embodiment of the present invention, the image capturing device further includes a light source disposed under the cover plate, and the wavelength of the light source is between 400 nm and 600 nm.

In an embodiment of the present invention, the image capturing device further includes an infrared light source arranged under the display panel.

In an embodiment of the present invention, the cover plate includes a finger pressure plate, a display panel, a touch display panel, or a combination of at least two of the foregoing.

In an embodiment of the present invention, the fixing member fixes the display panel on the carrier.

In an embodiment of the present invention, the fixing member is an adhesive material.

In an embodiment of the present invention, the adhesive material is filled between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the sensor.

In an embodiment of the present invention, the adhesive material is filled between the display panel and the first lens, between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the sensor. between.

In an embodiment of the present invention, the adhesive material is filled between the display panel and the first lens, between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the sensor. between.

In an embodiment of the present invention, the carrier includes an accommodation space, and the packaging component is accommodated in the accommodation space.

In an embodiment of the present invention, the carrier includes an accommodation space, and the display panel and the packaging component are accommodated in the accommodation space.

Based on the above, the beneficial effect of the imaging device of the embodiment of the present invention is that by setting the cover plate and the optical parameter design and arrangement of the three lenses, the imaging device is easier to manufacture, and the thickness is reduced while still having the ability to Optical performance to overcome aberrations. Therefore, the imaging device can maintain good image quality while achieving thinner profile.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

The directional terms mentioned in the embodiments, such as "up", "down", "front", "rear", "left", "right", etc., are only directions with reference to the drawings. Therefore, the directional terms used are used to illustrate, but not to limit the present invention. In the drawings, each drawing depicts the general features of methods, structures, and/or materials used in specific exemplary embodiments. However, these drawings should not be interpreted as defining or limiting the scope or nature covered by these exemplary embodiments. For example, for clarity, the relative thickness and position of each layer, region, and/or structure may be reduced or enlarged.

In the embodiments, the same or similar elements will use the same or similar reference numerals, and the redundant description will be omitted. In addition, the features in different exemplary embodiments can be combined without conflict, and simple equivalent changes and modifications made in accordance with this specification or the scope of the patent application still fall within the scope of this patent. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name discrete components or to distinguish different embodiments or ranges, and are not used to limit the number of components. The upper limit or lower limit is not used to limit the manufacturing sequence or the arrangement sequence of the components.

In an embodiment, each image capturing device is suitable for capturing the biological characteristics of the test object. For example, when the test object is a finger, the biometric feature can be a fingerprint or a vein. When the test object is a palm, the biological feature may be palm prints.

Fig. 1 is a schematic diagram of an image capturing device according to a first embodiment of the present invention. 1, the image capturing device 100 of the first embodiment of the present invention includes a cover 101, a first lens 102, an aperture 103, a second lens 104, and a first lens 102, a first lens 102, an aperture 103, a second lens 104, and a cover 101 arranged in order from the object side to the image side along the optical axis Three lenses 105 and a sensor 106. The object side is the side where the test object 10 is located, and the image side is the side where the imaging surface S9 is located. In this disclosure, the imaging surface S9 is the sensing surface of the sensor 106 in the image capturing device 100. When the imaging light beam from the object 10 (ie, light beams with biometric information, such as imaging light beam B1 and imaging light beam B2) enters the imaging device 100, it passes through the cover 101, the first lens 102, the aperture 103, The second lens 104 and the third lens 105 are then transferred to the sensing side of the sensor 106 (ie, the imaging surface S9), and an image is formed on the imaging surface S9.

The cover 101, the first lens 102, the second lens 104, and the third lens 105 each include an object side (such as the object side S1, S3, S5, S7) and an image side (such as the image side S2, S4, S6, S8). The object side is a surface that faces the object side (or the object 10) and allows the imaging light beam to pass, and the image side is a surface that faces the image side (or the imaging surface S9) and allows the imaging light to pass.

The cover 101 is suitable for protecting the components located under it. In this embodiment, the cover plate 101 is a finger pressure plate. When performing biometric identification, the object side S1 of the cover 101 is the surface that the object 10 contacts. In other words, the object 10 to be tested contacts the object side S1 of the cover 101 to perform biometric identification. The finger pressure plate may include a light-transmitting or semi-transmitting body to facilitate the transmission of the imaging light beam to the sensor 106. The main body may include a glass plate, a plastic plate, or a combination of the two, but is not limited to this. In addition, the finger pressure plate may optionally include a decorative layer, which is disposed on the cover plate 101 to hide the undesired elements below it.

In another embodiment, the cover 101 may include a finger pressure plate, a display panel, a touch display panel, or a combination of at least two of the foregoing. For example, the cover 101 may be a display panel, such as an organic light emitting display panel, but it is not limited to this. Alternatively, the cover 101 may be a touch display panel, such as an organic light emitting display panel with multiple touch electrodes. The multiple touch electrodes can be formed on the outer surface of the organic light emitting display panel or embedded in the organic light emitting display panel, and the multiple touch electrodes can perform touch detection in a self-capacitive or mutual-capacitive manner . Alternatively, the cover 101 may be a combination of a finger pressure plate and a display panel or a combination of a finger pressure plate and a touch display panel.

In addition, when the image capturing device 100 is integrated with a liquid crystal display (including a liquid crystal display panel and a backlight module), the cover 101 can be arranged above the liquid crystal display panel, or the opposite substrate in the liquid crystal display panel can be used as an image capturing device. The cover 101 of the device 100. The liquid crystal display may be formed with an opening for accommodating the optical imaging system (including the first lens 102, the second lens 104, the third lens 105 and the sensor 106). The backlight module is located under the liquid crystal display panel to provide illumination beams. In order to prevent the illumination beam from the backlight module from being directly transmitted to the sensor 106, a light shielding structure may be formed between the backlight module and the optical imaging system to maintain ideal imaging quality. Under the above structure, multiple touch electrodes can be further provided to provide a touch detection function.

The first lens 102 is suitable for enlarging the field of view (FOV) of the imaging device 100, so that the sensor 106 of the imaging device 100 can capture a larger image range. In this embodiment, the first lens 102 has negative refractive power. In addition, the object side surface S3 of the first lens 102 is concave at the near optical axis, and the image side surface S4 of the first lens 102 is concave at the near optical axis. The first lens 102 can be made of plastic material to meet the requirement of light weight, but it is not limited thereto.

The aperture 103 is suitable for reducing stray light to improve image quality. In this embodiment, the aperture 103 is arranged between the first lens 102 and the second lens 104, which helps to expand the angle of view, so that the imaging device 100 has the advantage of a wide-angle lens.

The second lens 104 is suitable for correcting the aberration generated by the first lens 102, and helps to reduce the generation of spherical aberration, so as to improve the imaging quality. In this embodiment, the second lens 104 has positive refractive power. In addition, the object side surface S5 of the second lens 104 is convex at the near optical axis, and the image side surface S6 of the second lens 104 is convex at the near optical axis. The second lens 104 can be made of plastic material to meet the requirements of light weight, but is not limited to this.

The third lens 105 is also suitable for correcting aberrations, and helps to reduce the occurrence of spherical aberration, so as to improve the image quality. In addition, by using multiple lenses (such as the second lens 104 and the third lens 105) to jointly correct aberrations, in addition to effectively correcting aberrations, it can also reduce the manufacturing difficulty of each lens used to correct aberrations. In this embodiment, the third lens 105 has negative refractive power. In addition, the object side surface S7 of the third lens 105 is concave at the near optical axis, and the image side surface S8 of the third lens 105 is convex at the near optical axis. The third lens 105 can be made of plastic material to meet the needs of lightweight, but not limited to this. In any exemplary embodiment of the present invention, the image side surface S8 of the third lens 105 may be coated with an infrared filter material. Alternatively, an infrared light filter layer (not shown) may be disposed between the third lens 105 and the second lens 104. Alternatively, an infrared light filter layer (not shown in the figure) may be provided between the third lens 105 and the imaging surface S9.

The sensor 106 is adapted to receive the imaging beam from the object 10 to be measured. In this embodiment, the sensor 106 can be, for example, a Charge-Coupled Device (CCD) or a Complementary Metal-Oxide-Semiconductor (CMOS), but the invention is not limited.

In the imaging device 100, only the first lens 102, the second lens 104 and the third lens 105 have refractive power, and the only two lenses with refractive power in the imaging device 100. In other words, the number of lenses in the imaging device 100 is only three.

表一 在表一中： f為取像裝置100的有效焦距(Effective Focal Length, EFL)； Fno為取像裝置100的光圈值(f-number)，即f/EPD，其中EPD為取像裝置100的入瞳孔徑； HFOV為取像裝置100的半視場角(Half Field Of View, HFOV)，即FOV的一半； imgH為取像裝置100的最大成像高度(即取像裝置100中感測器106的有效感光區域的對角線長度的一半)。 「曲率半徑(mm)」為無限大，代表對應表面為平面。 「距離(mm)」表示的是對應表面至下一表面在光軸I上的距離。舉例來說，待測物10的「距離(mm)」為0，代表待測物10面向蓋板101的表面S10至蓋板101的物側面S1在光軸I上的距離為0 mm。蓋板101的物側面S1的「距離(mm)」為1.800，代表蓋板101的物側面S1至蓋板101的像側面S2在光軸I上的距離為1.800 mm。第三透鏡105的像側面S8的「距離(mm)」為0.565，代表第三透鏡105的像側面S8至感測器106的成像面S9在光軸I上的距離為0.565 mm。其他欄位依此類推，於此不再贅述。The detailed optical data of the first embodiment is shown in Table 1.

Table 1 In Table 1: f is the effective focal length (Effective Focal Length, EFL) of the imaging device 100; Fno is the f-number of the imaging device 100, namely f/EPD, where EPD is the imaging device Entrance pupil aperture of 100; HFOV is the half field of view (Half Field Of View, HFOV) of the imaging device 100, that is, half of the FOV; imgH is the maximum imaging height of the imaging device 100 (that is, the sensor in the imaging device 100 Half of the diagonal length of the effective photosensitive area of the sensor 106). The "radius of curvature (mm)" is infinite, which means that the corresponding surface is flat. "Distance (mm)" means the distance on the optical axis I from the corresponding surface to the next surface. For example, the "distance (mm)" of the test object 10 is 0, which means that the distance from the surface S10 of the test object 10 facing the cover 101 to the object side S1 of the cover 101 on the optical axis I is 0 mm. The "distance (mm)" of the object side S1 of the cover 101 is 1.800, which means that the distance from the object side S1 of the cover 101 to the image side S2 of the cover 101 on the optical axis I is 1.800 mm. The "distance (mm)" of the image side surface S8 of the third lens 105 is 0.565, which means that the distance from the image side surface S8 of the third lens 105 to the imaging surface S9 of the sensor 106 on the optical axis I is 0.565 mm. Other fields can be deduced by analogy, so I won’t repeat them here.

...................(1) 在公式(1)中： Y表示非球面上的點與光軸I的垂直距離； Z表示非球面之深度(非球面上距離光軸I為Y的點，與相切於非球面光軸I上頂點之切面，兩者間的垂直距離)； R表示透鏡表面近光軸處的曲率半徑； K表示錐面係數(conic constant)；

表示第i階非球面係數。In this embodiment, the object side S3 of the first lens 102, the image side S4 of the first lens 102, the object side S5 of the second lens 104, the image side S6 of the second lens 104, and the object side S7 of the third lens 105 , The image side surface S8 of the third lens 105 is aspherical. The aspheric surface is defined by formula (1):

.........(1) In formula (1): Y represents the vertical distance between a point on the aspheric surface and the optical axis I; Z represents the depth of the aspheric surface (The vertical distance between the point Y from the optical axis I on the aspheric surface and the tangent to the vertex on the optical axis I of the aspheric surface); R represents the radius of curvature of the lens surface near the optical axis; K represents the cone Conic constant;

Represents the i-th order aspheric coefficient.

表二The object side S3 of the first lens 102, the image side S4 of the first lens 102, the object side S5 of the second lens 104, the image side S6 of the second lens 104, the object side S7 of the third lens 105, and the The aspheric coefficients of the image side S8 in formula (1) are shown in Table 2.

Table II

表三 在表三中： N1為第一透鏡102的折射率； N2為第二透鏡104的折射率； N3為第三透鏡105的折射率； OTL為待測物10至成像面S9在光軸I上的距離，也是蓋板101的物側面S1至成像面S9在光軸I上的距離； d為蓋板101的厚度； V1是第一透鏡102的色散係數，色散係數也可稱為阿貝數(Abbe number)； V2是第二透鏡104的色散係數； V3是第三透鏡105的色散係數； f1是第一透鏡102的焦距； f2是第二透鏡104的焦距； f3是第三透鏡105的焦距。The relationship between the important parameters in the imaging device 100 of the first embodiment is shown in Table 3.

Table 3 is in Table 3: N1 is the refractive index of the first lens 102; N2 is the refractive index of the second lens 104; N3 is the refractive index of the third lens 105; OTL is the object 10 to the imaging surface S9 on the optical axis The distance on I is also the distance from the object side S1 of the cover 101 to the imaging surface S9 on the optical axis I; d is the thickness of the cover 101; V1 is the dispersion coefficient of the first lens 102, which can also be called A Abbe number; V2 is the dispersion coefficient of the second lens 104; V3 is the dispersion coefficient of the third lens 105; f1 is the focal length of the first lens 102; f2 is the focal length of the second lens 104; f3 is the third lens The focal length of 105.

2A to 2C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the first embodiment. Figure 2A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm, where the sagittal direction and The curvature of field aberration in the tangential direction is represented by a curve S and a curve T, respectively. FIG. 2B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 2C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.0577 mm. It can be seen from FIGS. 2A to 2C that the imaging device 100 of the first embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100 of the first embodiment can be thinned (the OTL is reduced to 4.698 mm) while still providing good imaging quality.

According to different requirements, the imaging device 100 may further include other elements/layers, or omit the elements/layers in FIG. 1. For example, the imaging device 100 may further include a light source 107 to provide a light beam B3 that illuminates the object 10 to be measured. The light source 107 is arranged under the cover 101. In other words, the light source 107, the first lens 102, the aperture 103, the second lens 104, the third lens 105, and the sensor 106 are located on the same side of the cover 101.

The light source 107 may be a visible light source. For example, the wavelength of the light source 107 is between 400 nm and 600 nm, but not limited to this. Alternatively, the light source 107 may be a non-visible light source, such as an infrared light source. In another embodiment, when the image capturing device 100 is equipped with a display module, a part of the display light beam emitted by the display module can be used for biometric identification, so that the arrangement of the light source 107 can be omitted. In another embodiment, when the cover 101 is a display panel, a part of the display light beam emitted by the display panel can be used for biometric identification, so that the arrangement of the light source 107 can be omitted. In still another embodiment, when the cover 101 is a display panel, the light source 107 may be disposed under the display panel, and the light source 107 may be a non-visible light source, such as an infrared light source.

In this embodiment, the first lens 102, the aperture 103, the second lens 104, the third lens 105, and the sensor 106 of the image capturing device 100 may constitute the package assembly 108. By encapsulating these components together, it is helpful to improve the convenience of assembling the imaging device 100 and reduce the time required for assembly.

In this embodiment, the imaging device 100 may optionally include a fixing member 109 and a carrier 110. The fixing member 109 is disposed between the packaging component 108 and the carrier 110 to fix the packaging component 108 on the carrier 110. For example, the fixing member 109 may be light-curing adhesive, heat-curing adhesive, silicone resin or other materials, or a structure such as a slot structure, a spiral structure, etc., so that the package component 108 is fixed to the carrier 110 through the fixing member 109 on. In this embodiment, the fixing member 109 can be further disposed in the packaging component 108. That is, the fixing member 109 may be located between the first lens 102 and the aperture 103, between the aperture 103 and the second lens 104, between the second lens 104 and the third lens 105, and the third lens 105 and the sensor 106. between. For example, the fixing member 109 provided in the packaging component 108 may be, for example, a transparent adhesive material to fix the first lens 102, the aperture 103, the second lens 104, the third lens 105, and the sensor 106 on At the same time, and maintain the original imaging quality, the packaging component 108 is made of a light-transmissive material.

In another embodiment, when the cover 101 is a display panel, the display panel, the first lens 102, the aperture 103, the second lens 104, the third lens 105, and the sensor 106 may constitute a package component. The fixing member 109 may be located between the display panel and the first lens 102, between the first lens 102 and the aperture 103, between the aperture 103 and the second lens 104, between the second lens 104 and the third lens 105, and the third lens 105 and the sensor 106.

In this embodiment, the carrier 110 includes an accommodation space 110s, and the packaging component 108 can be accommodated in the accommodation space 110s. However, the shape of the carrier 110 is not limited to this. For example, the carrier 110 may also be a flat plate, and the packaging component (including or not including the display panel, including or not including the cover 101) is fixed on the carrier 110 by the fixing member 109.

Fig. 3 is a schematic diagram of an image capturing device according to a second embodiment of the present invention. Please refer to FIG. 3, the difference between the imaging device 100A of the second embodiment and the imaging device 100 of FIG. 1 is that the optical data, aspheric coefficients, and the parameters between these lenses are more or less different. In addition, the object side surface S1 of the first lens 102 is convex at the near optical axis, and the image side surface S8 of the third lens 105 is concave at the near optical axis.

表四The detailed optical data of the second embodiment is shown in Table 4.

Table Four

表五In the second embodiment, the aspheric coefficients of the object side surface and the image side surface of each lens in formula (1) are shown in Table 5.

Table 5

表六The relationship between the important parameters in the second embodiment is shown in Table 6.

Table 6

4A to 4C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the second embodiment. FIG. 4A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm. FIG. 4B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 4C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.0629 mm. It can be seen from FIGS. 4A to 4C that the imaging device 100A of the second embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100A of the second embodiment can be thinned (OTL reduced to 4.733 mm) while still providing good imaging quality.

Fig. 5 is a schematic diagram of an image capturing device according to a third embodiment of the present invention. Referring to FIG. 5, the difference between the image capturing device 100B of the third embodiment and the image capturing device 100 of FIG. 1 lies in that the optical data, aspheric coefficients, and the parameters between these lenses are more or less different. In addition, the object side surface S1 of the first lens 102 is convex at the near optical axis, and the image side surface S8 of the third lens 105 is concave at the near optical axis.

表七The detailed optical data of the third embodiment is shown in Table 7.

Table Seven

表八In the third embodiment, the aspheric coefficients of the object side surface and the image side surface of each lens in formula (1) are shown in Table 8.

Table 8

表九The relationship between the important parameters in the third embodiment is shown in Table 9.

Table 9

6A to 6C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the third embodiment. FIG. 6A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm. FIG. 6B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 6C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.0422 mm. It can be seen from FIGS. 6A to 6C that the imaging device 100B of the third embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100B of the third embodiment can be thinned (the OTL is reduced to 4.394 mm) while still providing good imaging quality.

Fig. 7 is a schematic diagram of an image capturing device according to a fourth embodiment of the present invention. Please refer to FIG. 7, the difference between the image capturing device 100C of the fourth embodiment and the image capturing device 100 of FIG. 1 is that the optical data, aspheric coefficients and the parameters between these lenses are more or less different. In addition, the object side surface S1 of the first lens 102 is convex at the near optical axis, and the image side surface S8 of the third lens 105 is concave at the near optical axis.

表十The detailed optical data of the fourth embodiment is shown in Table 10.

Table 10

表十一In the fourth embodiment, the aspheric coefficients of the object side surface and the image side surface of each lens in formula (1) are shown in Table 11.

Table 11

表十二The relationship between the important parameters in the fourth embodiment is shown in Table 12.

Table 12

8A to 8C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the fourth embodiment. FIG. 8A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm. FIG. 8B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 8C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.039 mm. It can be seen from FIGS. 8A to 8C that the imaging device 100C of the fourth embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100C of the fourth embodiment can provide good imaging quality while achieving a thin profile (OTL reduced to 4.704 mm).

Fig. 9 is a schematic diagram of an image capturing device according to a fifth embodiment of the present invention. Please refer to FIG. 9, the difference between the imaging device 100D of the fifth embodiment and the imaging device 100 of FIG. 1 is that the optical data, aspheric coefficients, and the parameters between these lenses are more or less different. In addition, the object side surface S1 of the first lens 102 is convex at the near optical axis.

表十三The detailed optical data of the fifth embodiment is shown in Table 13.

Table 13

表十四In the fifth embodiment, the aspheric coefficients of the object side surface and the image side surface of each lens in formula (1) are shown in Table 14.

Table 14

表十五The relationship between the important parameters in the fifth embodiment is shown in Table 15.

Table 15

10A to 10C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the fifth embodiment, respectively. FIG. 10A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm. FIG. 10B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 8C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.0585 mm. It can be seen from FIGS. 10A to 10C that the imaging device 100D of the fifth embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100D of the fifth embodiment can be thinned (the OTL is reduced to 4.457 mm) while still providing good imaging quality.

Fig. 11 is a schematic diagram of an image capturing device according to a sixth embodiment of the present invention. Please refer to FIG. 11, the difference between the image capturing device 100E of the sixth embodiment and the image capturing device 100 of FIG. 1 is that the optical data, aspheric coefficients, and the parameters between these lenses are more or less different. In addition, the object side surface S1 of the first lens 102 is convex at the near optical axis.

表十六The detailed optical data of the sixth embodiment is shown in Table 16.

Table 16

表十七In the sixth embodiment, the aspheric coefficients of the object side surface and the image side surface of each lens in formula (1) are shown in Table 17.

Table 17

表十八The relationship between the important parameters in the sixth embodiment is shown in Table 18.

Table 18

12A to 12C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the sixth embodiment, respectively. FIG. 12A illustrates the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane S9 when the wavelength is 550 nm. FIG. 12B illustrates the distortion aberration on the imaging surface S9 when the wavelength is 550 nm. Figure 12C illustrates the longitudinal spherical aberration when the wavelength is 550 nm and the pupil radius is 0.0481 mm. It can be seen from FIGS. 12A to 12C that the imaging device 100E of the sixth embodiment can significantly improve spherical aberration, effectively eliminate aberrations, and maintain distortion aberrations within the imaging quality requirements. Accordingly, it is explained that the imaging device 100E of the sixth embodiment can provide good imaging quality while being thinner (OTL reduced to 4.716 mm).

In each embodiment of the present invention, considering the ease of manufacture, process cost, overall thickness, and imaging quality at the same time, if at least one of the following conditional expressions is satisfied, a better setting can be made. f/imgH <0.45; 4.5 ＜ N1+N2+N3 ＜ 5.4; 2 ＜ (OTL-d)/imgH ＜ 9; Fno <3.7 or f/EPD <3.7; (OTL-d) <3.5 mm; V1+V2+V3 ＜75; 0.7＜ |f/f1|+|f/f2|+|f/f3| ＜ 1.7; 100 degrees ＜ FOV ＜ 180 degrees; and The distance on the optical axis I from the image side surface S8 of the third lens 105 to the imaging surface S9 is greater than 0.29 mm.

In detail, by satisfying f/imgH <0.45, it is helpful to collect a large-angle beam, so that the image capturing device can capture a larger image range in a short distance. By satisfying 4.5 <N1+N2+N3 <5.4, it is helpful to reduce the volume of the imaging device, thereby achieving a thin profile. By satisfying at least one of 2 <(OTL-d)/imgH <9 and (OTL-d) <3.5 mm, thinning can be achieved. By satisfying Fno <3.7 or f/EPD <3.7, a larger aperture can be achieved. In this way, it can also have a good imaging effect in an environment with insufficient light. By satisfying V1+V2+V3 <75, it helps to correct the chromatic aberration. By satisfying 0.7< |f/f1|+|f/f2|+|f/f3| <1.7, in addition to effectively correcting aberrations, the sensitivity of the optical system can also be reduced. By satisfying 100 degrees <FOV <180 degrees, the required imaging range can be obtained and the degree of distortion can be appropriately controlled.

In view of the unpredictability of the optical system design, under the framework of the present invention, at least one of the above-mentioned conditional formulas can better reduce the thickness of the imaging device, increase the available aperture, improve the imaging quality, or improve assembly. Rate increases to improve the shortcomings of the prior art.

In summary, the imaging device of the embodiment of the present invention has at least one of the following functions and advantages:

1. Compared with using two or less lenses to intercept the light beam reflected by the object to be measured, using three lenses to capture the light beam reflected by the object to be measured will help correct aberrations and reduce the difficulty of lens manufacturing.

Both the object side and the image side of the three lenses are designed with aspherical surfaces, which helps reduce aberrations.

3. The three-lens image capturing device can help to collect a large-angle beam, and then the image capturing device can receive a wide range of images. In addition, it also helps to reduce the distance between the object to be measured and the orientation device, effectively reducing the volume of the imaging device, and achieving a thinner profile.

4. The distance on the optical axis from the image side surface of the third lens to the imaging surface is greater than 0.29 mm. In this way, an element/film layer, such as a filter element, can be arranged between the third lens and the imaging surface as required, but not limited to this.

5. The aperture can be set selectively to reduce stray light and improve image quality. In one embodiment, by setting the aperture between the first lens and the second lens, it helps to expand the field of view, so that the image capturing device has the advantage of a wide-angle lens.

6. The longitudinal spherical aberration, field curvature, and distortion of the various embodiments of the present invention are in compliance with the usage specifications.

7. In the above-mentioned exemplary limited condition formulas, the numerical range within the maximum value/minimum value can be implemented accordingly. An unequal number of exemplary limited conditional expressions can also be optionally combined and applied to the embodiments of the present invention.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

10‧‧‧Object to be tested 100, 100A, 100B, 100C, 100D, 100E‧‧‧Image capture device 101‧‧‧Cover plate 102‧‧‧First lens 103‧‧‧Aperture 104‧‧‧Second lens 105‧‧‧Third lens 106‧‧‧Sensor 107‧‧‧Light source 108‧‧‧Packaging components 109‧‧‧Fixture 110‧‧‧Carrier Board 110s‧‧‧accommodating space B1, B2‧‧‧imaging beam B3‧‧‧Beam d‧‧‧Thickness I‧‧‧Optical axis S, T‧‧‧curve S1, S3, S5, S7‧‧‧Object side S2, S4, S6, S8‧‧‧Image side S9‧‧‧Image surface S10‧‧‧surface

Fig. 1 is a schematic diagram of an image capturing device according to a first embodiment of the present invention. 2A to 2C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the first embodiment. Fig. 3 is a schematic diagram of an image capturing device according to a second embodiment of the present invention. 4A to 4C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the second embodiment. Fig. 5 is a schematic diagram of an image capturing device according to a third embodiment of the present invention. 6A to 6C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the third embodiment. Fig. 7 is a schematic diagram of an image capturing device according to a fourth embodiment of the present invention. 8A to 8C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the fourth embodiment. Fig. 9 is a schematic diagram of an image capturing device according to a fifth embodiment of the present invention. 10A to 10C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the fifth embodiment, respectively. Fig. 11 is a schematic diagram of an image capturing device according to a sixth embodiment of the present invention. 12A to 12C are graphs of longitudinal spherical aberration and various aberrations of the imaging device of the sixth embodiment, respectively.

10‧‧‧Object to be tested

100‧‧‧Image capture device

101‧‧‧Cover plate

102‧‧‧First lens

103‧‧‧Aperture

104‧‧‧Second lens

105‧‧‧Third lens

106‧‧‧Sensor

107‧‧‧Light source

B1, B2‧‧‧imaging beam

B3‧‧‧Beam

d‧‧‧Thickness

I‧‧‧Optical axis

S1, S3, S5, S7‧‧‧Object side

S2, S4, S6, S8‧‧‧Image side

S9‧‧‧Image surface

S10‧‧‧surface

Claims (29)

An image capturing device includes a display panel and a packaging component. The packaging component includes a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a sensor, wherein the display The panel, the first lens, the second lens, the third lens, and the sensor are arranged in sequence along the optical axis from the object side to the image side, wherein the effective focal length of the image capturing device is f, and the The entrance pupil aperture is EPD, and the imaging device also satisfies: f/EPD<3.7. An image capturing device includes a display panel, a packaging component, a carrier, and a fixing member. The packaging component includes a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a A sensor, wherein the display panel, the first lens, the second lens, the third lens, and the sensor are arranged in order from the object side to the image side along the optical axis, the carrier carries the packaging component, and the fixing The packaging component is fixed on the carrier, wherein the effective focal length of the imaging device is f, the entrance pupil aperture of the imaging device is EPD, and the imaging device also satisfies: f/EPD<3.7. According to the imaging device described in item 2 of the scope of patent application, the fixing member fixes the display panel on the carrier. In the imaging device described in item 2 of the scope of patent application, the fixing member is an adhesive material. The imaging device according to claim 4, wherein the adhesive material is filled between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the third lens Between the sensors. In the imaging device described in item 3 of the scope of patent application, the fixing member is an adhesive material. The imaging device according to item 6 of the scope of patent application, wherein the adhesive material is filled between the display panel and the first lens, between the first lens and the second lens, and the second lens and the first lens Between the three lenses and between the third lens and the sensor. According to the image capturing device described in items 2, 4, and 5 of the scope of patent application, the carrier includes an accommodation space, and the packaging component is accommodated in the accommodation space. According to the image capturing device described in items 3, 6, and 7 of the scope of patent application, the carrier includes an accommodating space, and the display panel and the packaging component are accommodated in the accommodating space. Such as the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, wherein the imaging device satisfies: f/imgH<0.45; and 2<(OTL-d)/imgH<9, where imgH is the The maximum imaging height of the imaging device, OTL is the distance from the object to be measured to the imaging surface on the optical axis, and d is the thickness of the display panel. According to the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, the first lens, the second lens, and the third lens each have an object side surface and an image side surface, and the object side of the first lens The side surface, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, and the image side surface of the third lens are all aspherical , And the image capturing device further includes: an aperture set between the first lens and the second lens. Such as the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, wherein the imaging device also satisfies: (OTL-d)<3.5mm, where OTL is the object to be measured to the imaging surface on the optical axis And d is the thickness of the display panel. The imaging device as described in items 1, 2, 3, and 4 of the scope of patent application, wherein the refractive index of the first lens is N1, the refractive index of the second lens is N2, and the refractive index of the third lens is N3 , And the imaging device also satisfies: 12.5<N1+N2+N3<5.4. The imaging device as described in items 1, 2, 3, and 4 of the scope of patent application, wherein the dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, and the dispersion coefficient of the third lens is V3 , And the imaging device also satisfies: V1+V2+V3<75. According to the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the The imaging device also satisfies:

For the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, the field of view of the imaging device is FOV, and the imaging device also satisfies: 100°<FOV<180°. According to the imaging device described in items 1, 2, 3, and 4 of the scope of patent application, the distance from the image side surface of the third lens to the imaging surface on the optical axis is greater than 0.29 mm. The imaging device as described in items 1, 2, 3, and 4 of the scope of patent application further includes: an infrared light source arranged under the display panel. An image capturing device includes a cover plate, a first lens, a second lens, a third lens, and a sensor arranged in order from the object side to the image side along the optical axis, wherein the lens in the image capturing device The number is only three. The refractive powers of the first lens, the second lens, and the third lens are negative, positive, and negative in sequence, and the imaging device satisfies: f/imgH<0.45; and 2<(OTL- d)/imgH<9, where f is the effective focal length of the imaging device, imgH is the maximum imaging height of the imaging device, OTL is the distance from the object to be measured to the imaging surface on the optical axis, and d is the The thickness of the cover. The imaging device according to item 19 of the scope of patent application, wherein the first lens, the second lens and the third lens each have an object side surface and an image side surface, and the object side surface and the first lens side of the first lens The image side surface of a lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, and the image side surface of the third lens are all aspherical, and the The imaging device further includes: an aperture set between the first lens and the second lens. The imaging device described in item 19 of the scope of patent application is more satisfactory: (OTL-d)<3.5mm. The imaging device according to item 19 of the scope of patent application, wherein the refractive index of the first lens is N1, the refractive index of the second lens is N2, the refractive index of the third lens is N3, and the imaging device More satisfied: 4.5<N1+N2+N3<5.4. The imaging device according to item 19 of the scope of patent application, wherein the dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the imaging device More satisfied: V1+V2+V3<75. For the imaging device described in item 19 of the scope of patent application, the entrance pupil aperture of the imaging device is EPD, and the imaging device is more satisfied: f/EPD<3.7. The imaging device according to item 19 of the scope of patent application, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the imaging device further satisfies:

For the imaging device described in item 19 of the scope of patent application, the field of view of the imaging device is FOV, and the imaging device is more satisfied: 100°<FOV<180°. According to the imaging device described in item 19 of the scope of patent application, the distance from the image side surface of the third lens to the imaging surface on the optical axis is greater than 0.29 mm. As described in item 19 of the scope of patent application, the imaging device further includes: a light source disposed under the cover plate, and the wavelength of the light source is between 400 nm and 600 nm. The imaging device according to item 19 of the scope of patent application, wherein the cover plate includes a finger pressure plate, a display panel, a touch display panel, or a combination of at least two of the foregoing.

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