Optical image lens, image capturing device and electronic device

Abstract

The present application discloses an optical image lens, an image capturing device and an electronic device. The optical image lens comprises a plurality of optical lenses, including a plurality of plastic optical lenses. The optical image lens is provided with a long-wavelength red light absorbing optical lens. The long-wavelength red light absorbing optical lens transmits visible light and filters out long-wavelength red light, and is plastic and has refractive power. When certain conditions are met, better imaging results can be obtained. The present application also discloses an image capturing device having the above optical image lens and an electronic device having the above image capturing device.

Description

[0001] This application is a divisional application of the patent application filed on September 25, 2018, with application number 201811116744.4 and title "Optical Imaging Lens, Image Capture Device and Electronic Device". Technical Field

[0002] This invention relates to an optical imaging lens and an image capturing device, and more particularly to a miniaturized optical imaging lens and an image capturing device having an optical lens that can absorb long-wavelength red light and can be applied to electronic devices. Background Technology

[0003] Existing color image sensing elements exhibit increased response in the long-wavelength red light region of 650~700 nm and the infrared light region of 700 nm~1000 nm in the blue and green channels. If this light is not filtered out, it will result in poor image color reproduction and color saturation.

[0004] Traditional technologies use infrared cut coating filters (IRCF) or infrared absorbing plates (commonly known as blue glass, hereinafter referred to as BG) to filter out long-wavelength red light and near-infrared light above 650 nm. However, these methods have drawbacks. Although IRCF filters have a cost advantage, when the incident light angle increases, the filtered wavelength shifts towards shorter wavelengths, reducing the amount of red light entering the periphery and causing a color shift in the peripheral area relative to the center area. While the center / periphery color shift problem of infrared absorbing plates is less severe than that of IRCF filters, they are expensive and limited by the types of materials used. They cannot fully filter out infrared light, and an infrared cut coating still needs to be applied to the infrared absorbing plate. Summary of the Invention

[0005] The optical imaging lens, image capturing device, and electronic device provided by the present invention are equipped with a plastic lens that absorbs long-wavelength red light, and the penetration distance through which the main light rays pass is appropriately configured, which helps to obtain better imaging results.

[0006] According to the present invention, an optical imaging lens is provided, characterized in that it comprises a plurality of optical lenses. The optical imaging lens includes a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light, and is made of plastic and has refractive power. The optical imaging lens satisfies the following conditions: FNO ≤ 2.0; and 0.5 ≤ CP / CP0 ≤ 1.88, where FNO is the aperture value of the optical imaging lens, CP is the transmission distance of the principal ray within the imaging area of ​​the optical imaging lens in the range from the center field of view to 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the transmission distance of the principal ray in the center field of view of the optical imaging lens through the long-wavelength red light absorbing optical lens.

[0007] According to the present invention, an image capturing device is provided, characterized in that it includes an optical imaging lens as described above and an electronic photosensitive element disposed on an imaging surface of the optical imaging lens.

[0008] According to the present invention, an electronic device is provided, which is a mobile device, characterized in that it includes the image capturing device as described above.

[0009] According to the present invention, an optical imaging lens is provided, characterized in that it comprises a plurality of optical lenses. Among them, a long-wavelength red light absorbing optical lens is provided, which allows visible light to pass through and filters out long-wavelength red light, and is made of plastic and has refractive power. The optical imaging lens satisfies the following conditions: CRAmax ≥ 35.0; and 0.5 ≤ CP / CP0 ≤ 1.88; wherein the maximum principal ray angle of the optical imaging lens is CRAmax, CP is the penetration distance of the principal ray in the imaging area of ​​the optical imaging lens from the center field of view to the 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the penetration distance of the principal ray in the center field of view through the long-wavelength red light absorbing optical lens.

[0010] According to the present invention, an optical imaging lens is further provided, characterized in that it comprises a plurality of optical lenses, wherein the third optical lens from the object side to the image side has negative refractive power. The optical imaging lens includes a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light, and is made of plastic and has refractive power. The optical imaging lens satisfies the following condition: 0.5 ≤ CP / CP0 ≤ 1.88; where CP is the penetration distance of the principal ray in the imaging region of the optical imaging lens from the central field of view to the 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the penetration distance of the principal ray in the central field of view through the long-wavelength red light absorbing optical lens.

[0011] When FNO meets the above conditions, it helps to effectively increase the amount of light entering the sensor.

[0012] When CP / CP0 meets the above conditions, it helps to obtain better local color saturation, avoids off-axis imaging color shift, and helps to filter out infrared light, thus obtaining better imaging results. Attached Figure Description

[0013] To make the above and other objects, features, advantages and embodiments of the present invention more apparent and understandable, the accompanying drawings are described below:

[0014] Figure 1 This is a schematic diagram illustrating an image-capturing device according to a first embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram illustrating an image-capturing device according to a second embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram illustrating an electronic device according to a third embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram illustrating an electronic device according to a fourth embodiment of the present invention; and

[0018] Figure 5 This is a schematic diagram illustrating an electronic device according to a fifth embodiment of the present invention.

[0019] [Symbol Explanation]

[0020] Electronic devices: 10, 20, 30

[0021] Image capturing devices: 11, 21, 31

[0022] Aperture: 100, 200

[0023] Entry point center: 101, 201

[0024] First optical lens: 110

[0025] Object side surface: 111

[0026] Image side surface: 112

[0027] Second optical lens: 120, 220

[0028] Object-side surfaces: 121, 221

[0029] Side surfaces: 122, 222

[0030] Third optical lens: 230

[0031] Object side surface: 231

[0032] Image side surface: 232

[0033] Fourth optical lens: 140, 240

[0034] Object-side surfaces: 141, 241

[0035] Image side surface: 142, 242

[0036] Fifth optical lens: 150, 250

[0037] Object side surface: 151, 251

[0038] Image side surface: 152, 252

[0039] Sixth optical lens: 260

[0040] Object side surface: 261

[0041] Image side surface: 262

[0042] Long-wavelength red light absorbing optical lenses: 170, 270

[0043] Object side surface: 171, 271

[0044] Image side surface: 172, 272

[0045] Infrared filter coating: 180, 280

[0046] Protective glass: 190, 290

[0047] Imaging planes: 195, 295

[0048] Electronic photosensitive elements: 196, 296

[0049] CP: The distance by which the principal ray passes through the long-wavelength red light absorbing optical lens within the imaging area of ​​an optical imaging lens, from the center field of view to the 1.0 field of view.

[0050] CP0: The distance along the optical axis from which the principal ray of an optical imaging lens passes through a long-wavelength red light-absorbing optical lens.

[0051] T: Transmittance of long-wavelength red light absorbing optical lens

[0052] IT: Transmittance of infrared filter coating

[0053] T4560: Overall average transmittance of all long-wavelength red light absorbing optical lenses in optical imaging lenses at wavelengths of 450 nm to 600 nm.

[0054] IT4560: Infrared filter coating with overall average transmittance of 450 nm to 600 nm wavelengths.

[0055] T6570: Overall average transmittance of all long-wavelength red light absorbing optical lenses in optical imaging lenses at wavelengths of 650 nm to 700 nm.

[0056] IT6570: Infrared filter coating with overall average transmittance at wavelengths of 650 nm to 700 nm.

[0057] T6771: Overall average transmittance of all long-wavelength red light absorbing optical lenses in optical imaging lenses at wavelengths of 670 nm to 710 nm.

[0058] IT6771: Infrared filter coating with overall average transmittance at wavelengths of 670 nm to 710 nm

[0059] A550: Absorption value of long-wavelength red light absorbing optical lens at a wavelength of 550 nm.

[0060] A700: Absorption value of long-wavelength red light absorbing optical lens at 700 nm.

[0061] WLT50: Infrared filter coating at wavelengths with 50% transmittance.

[0062] FNO: Aperture value of the optical imaging lens

[0063] CRAmax: Maximum principal ray angle of an optical imaging lens

[0064] TTL: The distance from the surface of an optical imaging lens closest to the object side to the imaging plane.

[0065] IMGH: Maximum image height of an optical imaging lens Detailed Implementation

[0066] This invention provides an optical imaging lens comprising multiple optical lenses, including multiple plastic optical lenses that are refractive and aspherical. The optical imaging lens includes a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light, and is made of plastic and has refractive power.

[0067] Long-wavelength red light absorbing optical lenses satisfy the following condition: 0.5 ≤ CP / CP0 ≤ 2.0, where CP is the transmission distance of the principal ray within the imaging region of the optical imaging lens in the range from the center field of view to 1.0 through the long-wavelength red light absorbing optical lens, and CP0 is the transmission distance of the principal ray within the center field of view of the optical imaging lens through the long-wavelength red light absorbing optical lens. Therefore, CP / CP0 approaching 1 is optimal. When CP / CP0 is less than the lower limit, it leads to reduced image color saturation, while when CP / CP0 is greater than the upper limit, it causes color shift in the off-axis field of view, failing to achieve the existing infrared light filtering level. Preferably, it satisfies the following condition: 0.8 ≤ CP / CP0 ≤ 1.2. This limits the wavelength with 50% transmittance of the optical lens to an appropriate range (±7 nm).

[0068] According to the optical imaging lens of the present invention, the overall average transmittance of all long-wavelength red light absorbing optical lenses at wavelengths of 650 nm to 700 nm is T6570, and the overall average transmittance of all long-wavelength red light absorbing optical lenses at wavelengths of 450 nm to 600 nm is T4560, which can satisfy the following conditions: T6570 ≤ 50%; and T4560 ≥ 80%. This allows for the filtering of long-wavelength red light, thereby avoiding image color distortion and facilitating the miniaturization of the optical imaging lens.

[0069] According to the optical imaging lens of the present invention, the overall average transmittance of all long-wavelength red light absorbing optical lenses at wavelengths of 670 nm to 710 nm is T6771, the absorption value of the long-wavelength red light absorbing optical lenses at wavelength of 700 nm is A700, and the absorption value of the long-wavelength red light absorbing optical lenses at wavelength of 550 nm is A550, which satisfies the following conditions: T6771 ≤ 20%; and A700 / A550 ≥ 10. This suppresses the color shift problem of the infrared filtering coating.

[0070] According to the optical imaging lens of the present invention, it may be provided with an aperture to control the maximum amount of light entering the lens at the center of the imaging area. A long-wavelength red light absorbing optical lens is adjacent to the aperture, and the long-wavelength red light absorbing optical lens may have positive refractive power on the near-optical axis. This allows for a more favorable CP / CP0 variation, avoiding peripheral color shift problems.

[0071] According to the optical imaging lens of the present invention, the long-wavelength red light absorbing optical lens can have refractive power and an aspherical surface, and the long-wavelength red light absorbing optical lens can be manufactured by injection molding. This helps the optical imaging lens achieve a better CP / CP0 value while simultaneously reducing aberration loss.

[0072] According to the optical imaging lens of the present invention, the long-wavelength red light absorbing optical lens can be made of thermoplastic plastic. This effectively improves the optical processing precision of the long-wavelength red light absorbing optical lens.

[0073] According to the optical imaging lens of the present invention, the long-wavelength red light absorbing optical lens may have a long-wavelength red light absorbing component, which is uniformly distributed within the long-wavelength red light absorbing optical lens. This achieves better surface accuracy and processing stability. The long-wavelength red light absorbing component may be an organic compound or an organometallic compound, and may be a commercially available product suitable for thermoplastics, such as QCR Solutions Corp's NIR Absorb Materials for Plastic (Thermal Resin) series, or similar or equivalent products from other suppliers.

[0074] According to the optical imaging lens of the present invention, an imaging surface is provided on the image side, and an infrared filtering coating may be provided in the optical imaging lens or between the optical imaging lens and the imaging surface. This helps to filter out infrared light, reduces the material complexity of long-wavelength red light absorbing optical lenses, and improves production stability. The infrared filtering coating may be provided on a flat element between the optical imaging lens and the imaging surface, or it may be provided on the surface of a relatively flat optical lens within the optical imaging lens with a small principal ray incident angle.

[0075] In addition, cesium-based oxide materials such as CsWOx can also be added to plastic optical lenses to replace the aforementioned infrared filtering coating, which can help reduce the thickness of optical imaging lenses.

[0076] According to the optical imaging lens of the present invention, the infrared filtering coating transmits in the visible light spectrum and filters in the near-infrared spectrum. The wavelength at which the infrared filtering coating has 50% transmittance is WLT50, which satisfies the following condition: WLT50 ≥ 670 nm. This allows the short-wavelength drift of the infrared filtering coating in the peripheral field of view to be covered by a long-wavelength red light absorbing optical lens, thereby reducing the significant center / peripheral color shift. Preferably, it satisfies the following condition: WLT50 ≥ 690 nm, and uses an infrared filtering coating with a higher number of coating layers. This allows the short-wavelength drift problem of the infrared filtering coating to be sufficiently covered by the long-wavelength red light absorbing optical lens. Preferably, it satisfies the following condition: WLT50 ≤ 730 nm. This helps to simplify the composition of the long-wavelength red light absorbing optical lens and improves production stability. In addition, the wavelength range of 50% transmittance for the aforementioned infrared filtering coating refers to the visible red light region to the near-infrared light region.

[0077] According to the optical imaging lens of the present invention, a protective glass may be additionally provided, and an infrared filtering coating is provided on at least one surface of the protective glass. This facilitates the reduction of CP / CP0 variation and avoids peripheral color shift problems.

[0078] The optical imaging lens according to the present invention may include one of the aforementioned long-wavelength red light absorbing optical lenses. This maintains the filtering effect of long-wavelength red light while being cost-effective. Furthermore, the optical imaging lens may include one long-wavelength red light absorbing optical lens, or two or more long-wavelength red light absorbing optical lenses, to increase the filtering bandwidth.

[0079] According to the optical imaging lens of the present invention, the aperture value (f-number) of the optical imaging lens is FNO, the maximum principal ray angle of the optical imaging lens is CRAmax, the distance from the object side to the imaging plane of the optical imaging lens is TTL, and the maximum image height of the optical imaging lens is 1MGH, which can satisfy the following conditions: FNO ≤ 2.4; CRAmax ≥ 20; and 0.8 ≤ TTL / 1MGH ≤ 3.0. This effectively increases the amount of light entering the lens. Since too little light entering the lens will prevent the absorption of long-wavelength red light components from being utilized, appropriately controlling the ratio of the total length to the image height of the optical imaging lens can help reduce its size and achieve miniaturization.

[0080] The various technical features in the optical imaging lens of the present invention can be combined and configured to achieve the corresponding effects.

[0081] In the optical imaging lens provided by the present invention, if the optical imaging lens contains two long-wavelength red light absorbing optical lenses, the comprehensive average transmittance T6570 of all the aforementioned long-wavelength red light absorbing optical lenses at wavelengths of 650 nm to 700 nm is obtained by multiplying the individual T6570 values ​​calculated for each of the two long-wavelength red light absorbing optical lenses. If there are multiple absorbing lenses, the same principle applies.

[0082] In the optical imaging lens provided by the present invention, the principal ray of the optical imaging lens is a ray that passes through the center of the entrance pupil, and the maximum image height in the imaging area is defined as the 1.0F field of view.

[0083] In the optical imaging lens of this invention, the aperture can be configured as a front aperture or a center aperture. The aperture configuration is used to control the maximum amount of light entering the optical imaging lens at the center of the imaging area. A front aperture means the aperture is located at the object-side end of the first optical lens in the imaging lens system, while a center aperture means the aperture is located between the first optical lens and the imaging plane. If the aperture is a front aperture, a longer distance can be created between the exit pupil and the imaging plane, giving it a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS sensor. If the aperture is a center aperture, it helps to expand the field of view of the imaging lens system, giving the optical imaging lens the advantages of a wide-angle lens.

[0084] In the optical imaging lens of the present invention, at least one aperture stop may be provided, which may be located in front of the first optical lens, between each optical lens, or after the last optical lens. The aperture stop may be of the type such as a glare stop or a field stop, which can be used to reduce stray light and help improve image quality.

[0085] The optical imaging lens of the present invention may be provided with elements such as aperture, lens barrel, light-shielding element, fixing element, protective glass, and light-filtering element as required.

[0086] In the optical imaging lens provided by this invention, the optical lenses and long-wavelength red light absorbing optical lenses can be made of plastic. Using plastic for the optical lenses effectively reduces production costs. Furthermore, the object-side and image-side surfaces of the optical imaging lens can be aspherical (ASP). Aspherical surfaces can be easily manufactured into shapes other than spherical surfaces, providing more controllable variables to reduce aberrations and thus reduce the number of optical lenses used, thereby effectively reducing the overall length of the optical imaging lens of this invention. Additionally, the plastic material can also be replaced with resin.

[0087] In the optical imaging lens provided by this invention, if the surface of the optical lens is convex and the position of the convex surface is not defined, it means that the surface of the optical lens can be convex near the optical axis; if the surface of the optical lens is concave and the position of the concave surface is not defined, it means that the surface of the optical lens can be concave near the optical axis. In the optical imaging lens provided by this invention, if the optical lens has positive or negative refractive power, or the focal length of the optical lens, it can refer to the refractive power or focal length of the optical lens near the optical axis, and the position of the refractive power of the optical lens can be near the optical axis, off-axis, or peripheral.

[0088] The imaging surface of the optical imaging lens of the present invention can be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, especially a curved surface with a concave surface facing the object side.

[0089] The optical imaging lens of this invention can also be widely applied to electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile products, digital tablets, smart TVs, network monitoring equipment, motion-sensing game consoles, dashcams, reversing cameras, and wearable products. The aforementioned electronic devices are merely illustrative examples of practical applications of this invention and are not intended to limit the scope of application of the imaging device of this invention.

[0090] This invention provides an image-capturing device comprising the aforementioned optical imaging lens and an electronic photosensitive element, the electronic photosensitive element being disposed on an imaging surface of the optical imaging lens. By arranging a long-wavelength red light-absorbing optical lens in the optical imaging lens and appropriately configuring the transmission distance through which the main light ray passes, it is helpful to obtain better local color saturation and avoid off-axis color shift in the imaging field of view, and to improve the degree of infrared light filtering. Preferably, the image-capturing device may further include a barrel member, a holder member, or a combination thereof.

[0091] This invention provides an electronic device, which can be a mobile device, comprising the image capturing device described above. This effectively improves image quality. Preferably, the electronic device may further comprise a control unit, a display unit, a storage unit, random access memory (RAM), or a combination thereof.

[0092] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0093] <First Embodiment>

[0094] Please refer to Figure 1 This is a schematic diagram illustrating an image-capturing device according to a first embodiment of the present invention. Figure 1 As can be seen, the imaging device of the first embodiment includes an optical imaging lens (not otherwise labeled) and an electronic photosensitive element 196. The optical imaging lens includes an entrance pupil center 101. From the object side to the image side, the optical imaging lens sequentially includes an aperture 100, a first optical lens 110, a second optical lens 120, a long-wavelength red light absorbing optical lens 170, a fourth optical lens 140, a fifth optical lens 150, an infrared filter coating 180, a protective glass 190, and an imaging surface 195, while the electronic photosensitive element 196 is disposed on the imaging surface 195 of the optical imaging lens.

[0095] The first optical lens 110 has positive refractive power, and its object-side surface 111 and image-side surface 112 are both aspherical. The first optical lens 110 is made of plastic material, such as COC / COP material, like Mitsui Chemicals' APL series or ZEON's ZEONEX series.

[0096] The second optical lens 120 has negative refractive power, and its object-side surface 121 and image-side surface 122 are both aspherical. The second optical lens 120 is made of plastic material.

[0097] The long-wavelength red light absorbing optical lens 170 has negative refractive power, and both its object-side surface 171 and image-side surface 172 are aspherical. The long-wavelength red light absorbing optical lens 170 is made of thermoplastic plastic material using injection molding technology. The plastic material is high-refractive-index polycarbonate (PC), such as MGC's EP series or Teijin's SP series. Alternatively, the plastic material can be replaced with polyester, such as OGC's OKP series. The long-wavelength red light absorbing optical lens 170 contains a long-wavelength red light absorbing component, which is a commercially available injection-molded grade organometallic compound absorbing component. This long-wavelength red light absorbing component is uniformly mixed within the long-wavelength red light absorbing optical lens 170.

[0098] The fourth optical lens 140 has positive refractive power, and its object-side surface 141 and image-side surface 142 are both aspherical. The fourth optical lens 140 is made of plastic material.

[0099] The fifth optical lens 150 has negative refractive power, and both its object-side surface 151 and image-side surface 152 are aspherical. The fifth optical lens 150 is made of plastic material.

[0100] The protective glass 190 is positioned between the fifth optical lens 150 and the imaging surface 195 and does not affect the focal length of the optical imaging lens.

[0101] An infrared filtering coating 180 is disposed on the object-side surface (unspecified) of the protective glass 190, located between the optical imaging lens and the imaging surface 195. The infrared filtering coating 180 allows visible light to pass through while filtering out near-infrared light.

[0102] The optical imaging lens has an FNO of 2.00, a maximum CRA of 35.8 degrees, and a TTL / IMGH of 1.36.

[0103] Refer to Table 1 below.

[0104]

[0105] Table 1 is... Figure 1 The first embodiment provides detailed CP and CP / CP0 data for each optical lens, where P1-P5 sequentially represent the first optical lens 110, the second optical lens 120, the long-wavelength red light absorbing optical lens 170, the fourth optical lens 140, and the fifth optical lens 150 from the object side to the image side.

[0106] In the first embodiment, the long-wavelength red light absorbing optical lens in the optical imaging lens is set as the third optical lens, and its CP / CP0 value falls within the range of 0.98 to 1.04, which is the optimal choice for this embodiment. However, if production factors are considered, the long-wavelength red light absorbing optical lens 170 can also be configured as the first optical lens, and its CP / CP0 value is between 1.0 and 1.09, which is also an excellent choice.

[0107] Referring to Table 2 below, T represents the transmittance of the long-wavelength red light absorbing optical lens, IT represents the transmittance of the infrared filtering coating, T4560 represents the comprehensive average transmittance of the long-wavelength red light absorbing optical lens at wavelengths of 450 nm to 600 nm, T6570 represents the comprehensive average transmittance of the long-wavelength red light absorbing optical lens at wavelengths of 650 nm to 700 nm, T6771 represents the comprehensive average transmittance of the long-wavelength red light absorbing optical lens at wavelengths of 670 nm to 710 nm, A550 represents the absorption value of the long-wavelength red light absorbing optical lens at wavelength 550 nm, and A700 represents the absorption value of the long-wavelength red light absorbing optical lens at wavelength 700 nm.

[0108]

[0109]

[0110] Table 2 shows the transmittance data of the long-wavelength red light absorbing optical lens 170 and the infrared filtering coating 180 in the first embodiment. Here, the WLT50 of the infrared filtering coating 180 is 709 nm. However, if it is desired to reduce the cost of the infrared filtering coating 180, the WLT50 can be adjusted to 680~690 nm to relax the coating layer requirements and production specifications of the infrared filtering coating 180. In addition, the definitions of the data in the tables of the following embodiments are the same as those in Tables 1 to 2 of the first embodiment, and will not be repeated hereafter.

[0111] <Second Embodiment>

[0112] Please refer to Figure 2 This is a schematic diagram illustrating an image-capturing device according to a second embodiment of the present invention. Figure 2 As can be seen, the imaging device of the second embodiment includes an optical imaging lens (not otherwise labeled) and an electronic photosensitive element 296. The optical imaging lens includes an entrance pupil center 201. From the object side to the image side, the optical imaging lens sequentially includes an aperture 200, a long-wavelength red light absorbing optical lens 270, a second optical lens 220, a third optical lens 230, a fourth optical lens 240, a fifth optical lens 250, a sixth optical lens 260, an infrared filtering coating 280, a protective glass 290, and an imaging surface 295, while the electronic photosensitive element 296 is disposed on the imaging surface 295 of the optical imaging lens.

[0113] Aperture 200 is the maximum amount of light that can be captured by an optical imaging lens at the center of the imaging area.

[0114] The long-wavelength red light absorbing optical lens 270 has positive refractive power. Both its object-side surface 271 and image-side surface 272 are aspherical. The long-wavelength red light absorbing optical lens 270 is adjacent to an aperture 200. The long-wavelength red light absorbing optical lens 270 is made of thermoplastic material using injection molding technology. The plastic material is a cyclic olefin polymer (COC / COP). The long-wavelength red light absorbing optical lens 270 contains long-wavelength absorbing components. These components are commercially available injection-molded grade organic absorbers, and the long-wavelength red light absorbing components are uniformly mixed within the long-wavelength red light absorbing optical lens 270.

[0115] The second optical lens 220 has negative refractive power. Its object-side surface 221 and image-side surface 222 are both aspherical. The second optical lens 220 is made of plastic material and is manufactured by injection molding technology. The plastic material is high refractive polycarbonate (PC) material, such as MGC's EP series or Teijin's SP series.

[0116] The third optical lens 230 has negative refractive power, and its object-side surface 231 and image-side surface 232 are both aspherical. The third optical lens 230 is made of plastic material.

[0117] The fourth optical lens 240 has positive refractive power, and its object-side surface 241 and image-side surface 242 are both aspherical. The fourth optical lens 240 is made of plastic material.

[0118] The fifth optical lens 250 has negative refractive power, and both its object-side surface 251 and image-side surface 252 are aspherical. The fifth optical lens 250 is made of plastic material.

[0119] The sixth optical lens 260 has negative refractive power, and both its object-side surface 261 and image-side surface 262 are aspherical. The sixth optical lens 260 is made of plastic material.

[0120] The protective glass 290 is positioned between the sixth optical lens 260 and the imaging surface 295 and does not affect the focal length of the optical imaging lens.

[0121] An infrared filtering coating 280 is disposed on the object-side surface (unspecified) of the protective glass 290, located between the optical imaging lens and the imaging surface 295. The infrared filtering coating 280 allows visible light to pass through while filtering out near-infrared light.

[0122] Cesium-based oxide materials can also be used to replace infrared filtering coatings, such as tungsten cesium oxide compounds (CsWOx), which can be applied to the surface of optical lenses or uniformly distributed in optical lenses to achieve the effect of filtering infrared light and have low absorption of visible light. When the material is used in an optical imaging lens, it can selectively replace the infrared filtering coating 280.

[0123] The optical imaging lens has an FNO of 1.80, a maximum CRA of 35.0 degrees, and a TTL / IMGH of 1.48.

[0124] Refer to Table 3 below.

[0125]

[0126] Table 3 shows the CP and CP / CP0 data of each optical lens in the second embodiment, where P1-P6 represent the long-wavelength red light absorbing optical lens 270, the second optical lens 220, the third optical lens 230, the fourth optical lens 240, the fifth optical lens 250, and the sixth optical lens 260 from the object side to the image side.

[0127] In the first embodiment, the long-wavelength red light absorbing optical lens in the optical imaging lens is set in the first optical lens, and its CP / CP0 value falls within 1.00~1.09, which is the optimal choice for this embodiment. However, considering production factors, the long-wavelength red light absorbing optical lens 270 can also be set in the second optical lens, and its CP / CP0 value is between 1.00~1.14, which is also an excellent choice.

[0128] See Table 4 below.

[0129]

[0130]

[0131] Table 4 shows detailed transmittance data for the long-wavelength red light absorbing optical lens 270 and the infrared filtering coating 280 in the second embodiment, wherein the infrared filtering coating 280 has a 50% transmittance wavelength of approximately 709 nm.

[0132] In the second embodiment, the definitions of the parameters are the same as in the first embodiment, and will not be repeated here.

[0133] <Third Embodiment>

[0134] Please refer to Figure 3 This is a schematic diagram illustrating an electronic device 10 according to a third embodiment of the present invention. The electronic device 10 of the third embodiment is a smartphone. The electronic device 10 includes an image capturing device 11, which includes an optical image lens (not shown) according to the present invention and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on the imaging surface of the optical image lens.

[0135] <Fourth Embodiment>

[0136] Please refer to Figure 4This is a schematic diagram illustrating an electronic device 20 according to a fourth embodiment of the present invention. The electronic device 20 of the fourth embodiment is a tablet computer. The electronic device 20 includes an image capturing device 21, which includes an optical image lens (not shown) according to the present invention and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on the imaging surface of the optical image lens.

[0137] <Fifth Embodiment>

[0138] Please refer to Figure 5 This is a schematic diagram illustrating an electronic device 30 according to a fifth embodiment of the present invention. The electronic device 30 of the fifth embodiment is a wearable device, and the electronic device 30 includes an image capturing device 31, which includes an optical imaging lens (not shown) according to the present invention and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on the imaging surface of the optical imaging lens.

[0139] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An optical imaging lens, characterized in that, Include: Multiple optical lenses; The optical imaging lens is equipped with a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light. It is made of plastic and has refractive power. The optical imaging lens satisfies the following conditions: FNO ≤ 2.0; and 0.5 ≤ CP / CP0 ≤ 1.88; Wherein, FNO is the aperture value of the optical imaging lens, CP is the penetration distance of the main ray in the imaging area of ​​the optical imaging lens from the center field of view to the 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the penetration distance of the main ray in the center field of view of the optical imaging lens through the long-wavelength red light absorbing optical lens.

2. The optical imaging lens according to claim 1, characterized in that, It meets the following conditions: 0.68 ≤ CP / CP0 ≤ 1.

22.

3. The optical imaging lens according to claim 2, characterized in that, It meets the following conditions: 0.8 ≤ CP / CP0 ≤ 1.

2.

4. The optical imaging lens according to claim 3, characterized in that, It meets the following conditions: 0.98 ≤ CP / CP0 ≤ 1.

09.

5. The optical imaging lens according to claim 3, characterized in that, The overall average transmittance of all these long-wavelength red light absorbing optical lenses in the wavelength range of 650 nm to 700 nm is T6570, and the overall average transmittance of all these long-wavelength red light absorbing optical lenses in the wavelength range of 450 nm to 600 nm is T4560, which satisfies the following conditions: T6570 ≤ 15%; and T4560 ≥ 80%。 6. The optical imaging lens according to claim 3, characterized in that, The overall average transmittance of all these long-wavelength red light absorbing optical lenses in the wavelength range of 670 nm to 710 nm is T6771, the absorption value of the long-wavelength red light absorbing optical lens at a wavelength of 700 nm is A700, and the absorption value of the long-wavelength red light absorbing optical lens at a wavelength of 550 nm is A550. They satisfy the following conditions: T6771 ≤ 20%; and A700 / A550 ≥ 30.

37.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens is provided with an aperture, and the long-wavelength red light absorbing optical lens is adjacent to the aperture, and the long-wavelength red light absorbing optical lens has a positive refractive force on the near optical axis.

8. The optical imaging lens according to claim 1, characterized in that, The first or third optical lens of the optical imaging lens, from the object side to the image side, is the long-wavelength red light absorbing optical lens.

9. The optical imaging lens according to claim 3, characterized in that, The long-wavelength red light absorbing optical lens is manufactured by injection molding and is made of thermoplastic plastic.

10. The optical imaging lens according to claim 9, characterized in that, The thermoplastic is selected from at least one of cyclic olefin polymers, high-refractive-index polycarbonates, or polyesters.

11. The optical imaging lens according to claim 1, characterized in that, An imaging surface is provided on the image side of the optical imaging lens, and an infrared filtering coating is provided in the optical imaging lens or between the optical imaging lens and the imaging surface.

12. The optical imaging lens according to claim 11, characterized in that, The infrared filtering coating is transparent to visible light and filters out near-infrared light. The infrared filtering coating has a 50% transmittance at a wavelength of WLT50, and it meets the following conditions: WLT50 ≥ 670 nm.

13. The optical imaging lens according to claim 12, characterized in that, The infrared filtering coating has a transmittance of 50% at a wavelength of WLT50 and meets the following conditions: WLT50 ≥ 690 nm.

14. The optical imaging lens according to claim 12, characterized in that, The infrared filtering coating has a transmittance of 50% at a wavelength of WLT50 and meets the following conditions: WLT50 ≤ 730 nm.

15. The optical imaging lens according to claim 12, characterized in that, A protective glass is provided in front of the imaging lens of the optical imaging lens, and the infrared filtering coating is provided on at least one surface of the protective glass.

16. The optical imaging lens according to claim 1, characterized in that, The distance from the object side to the imaging plane of the optical imaging lens is TTL, and the maximum image height of the optical imaging lens is 1MGH. It satisfies the following conditions: 0.8 ≤ TTL / IMGH ≤ 3.

0.

17. An image capturing device, characterized in that, Include: The optical imaging lens as described in claim 1; and An electronic photosensitive element is disposed on an imaging surface of the optical imaging lens.

18. An electronic device, which is a mobile device, characterized in that, Include: The imaging device as described in claim 17.

19. An optical imaging lens, characterized in that, Include: Multiple optical lenses; The optical imaging lens is equipped with a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light. It is made of plastic and has refractive power. The optical imaging lens satisfies the following conditions: CRAmax ≥ 35.0; and 0.5 ≤ CP / CP0 ≤ 1.88; The maximum principal ray angle of the optical imaging lens is CRAmax, CP is the penetration distance of the principal ray in the imaging area of ​​the optical imaging lens from the center field of view to the 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the penetration distance of the principal ray in the center field of view of the optical imaging lens through the long-wavelength red light absorbing optical lens.

20. The optical imaging lens according to claim 19, characterized in that, It meets the following conditions: 0.8 ≤ CP / CP0 ≤ 1.

2.

21. The optical imaging lens according to claim 20, characterized in that, It meets the following conditions: 0.98 ≤ CP / CP0 ≤ 1.

09.

22. The optical imaging lens according to claim 20, characterized in that, The optical imaging lens is provided with an aperture, and the long-wavelength red light absorbing optical lens is adjacent to the aperture, and the long-wavelength red light absorbing optical lens has a positive refractive force on the near optical axis.

23. The optical imaging lens according to claim 20, characterized in that, The first or third optical lens of the optical imaging lens, from the object side to the image side, is the long-wavelength red light absorbing optical lens.

24. The optical imaging lens according to claim 23, characterized in that, The material of the long-wavelength red light absorbing optical lens is selected from at least one of cyclic olefin polymers, high-refractive-index polycarbonate, or polyesters.

25. The optical imaging lens according to claim 19, characterized in that, An imaging surface is provided on the image side of the optical imaging lens, and an infrared filtering coating is provided in the optical imaging lens or between the optical imaging lens and the imaging surface.

26. An optical imaging lens, characterized in that, Include: Multiple optical lenses, the third optical lens from the object side to the image side of the optical imaging lens has negative refractive power; The optical imaging lens is equipped with a long-wavelength red light absorbing optical lens, which allows visible light to pass through and filters out long-wavelength red light. It is made of plastic and has refractive power. The optical imaging lens satisfies the following conditions: 0.5 ≤ CP / CP0 ≤ 1.88; Wherein, CP is the penetration distance of the main ray in the imaging area of ​​the optical imaging lens from the center field of view to the 1.0 field of view through the long-wavelength red light absorbing optical lens, and CP0 is the penetration distance of the main ray in the center field of view of the optical imaging lens through the long-wavelength red light absorbing optical lens.

27. The optical imaging lens according to claim 26, characterized in that, It meets the following conditions: 0.8 ≤ CP / CP0 ≤ 1.

2.

28. The optical imaging lens according to claim 27, characterized in that, It meets the following conditions: 0.98 ≤ CP / CP0 ≤ 1.

09.

29. The optical imaging lens according to claim 27, characterized in that, The optical imaging lens is provided with an aperture, and the long-wavelength red light absorbing optical lens is adjacent to the aperture, and the long-wavelength red light absorbing optical lens has a positive refractive force on the near optical axis.

30. The optical imaging lens according to claim 27, characterized in that, The first or third optical lens of the optical imaging lens, from the object side to the image side, is the long-wavelength red light absorbing optical lens.

31. The optical imaging lens according to claim 30, characterized in that, The material of the long-wavelength red light absorbing optical lens is selected from at least one of cyclic olefin polymers, high-refractive-index polycarbonate, or polyesters.

32. The optical imaging lens according to claim 26, characterized in that, An imaging surface is provided on the image side of the optical imaging lens, and an infrared filtering coating is provided in the optical imaging lens or between the optical imaging lens and the imaging surface.

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