CN115561880A

CN115561880A - Optical image lens, image capturing device and electronic device

Info

Publication number: CN115561880A
Application number: CN202211357379.2A
Authority: CN
Inventors: 张沛颀; 黄有执
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2018-04-11
Filing date: 2018-09-25
Publication date: 2023-01-03
Also published as: CN110361831A; TWI721397B; TWI751898B; TW202119065A; TW201944116A; CN110361831B; TW201944102A; TWI687717B

Abstract

The invention discloses an optical image lens, an image capturing device and an electronic device. The optical image lens comprises a plurality of optical lenses, wherein the optical lenses comprise a plurality of plastic optical lenses. The optical image lens is provided with a long-wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power. When a specific condition is satisfied, it is helpful to obtain a better imaging effect. The invention also discloses an image capturing device with the optical image lens and an electronic device with the image capturing device.

Description

Optical image lens, image capturing device and electronic device

The present application is a divisional application of patent applications with application number 2018, 09 and 25, and application number 201811116744.4 entitled "optical imaging lens system, image capturing device and electronic device".

Technical Field

The present invention relates to an optical imaging lens and an image capturing device, and more particularly, to a compact optical imaging lens and an image capturing device having an optical lens capable of absorbing long wavelength red light and being applied to an electronic device.

Background

The existing color image sensing device has the phenomenon of increased response in the areas of red light with long wavelength of 650-700 nm and infrared light with 700-1000 nm of blue channel and green channel, and the color reproduction and color saturation of the image are not good because the part of light is not filtered.

The conventional technology uses an IR Cut Coating Filter (IRCF) or an IR absorbing plate (BG) to Filter red light and near infrared light with a wavelength longer than 650nm, but the above method has its drawbacks, and although the IR filtering Coating Filter has a cost advantage, when the incident light angle is increased, the filtering wavelength will move to the short wavelength direction, so that the incident light amount of the peripheral red light is reduced, which causes the color shift phenomenon in the peripheral area relative to the central area. The problem of color cast at the center/periphery of the infrared absorption plate is slight compared with the infrared filtering and coating filter, but the cost is high and limited by the material type, the infrared light cannot be filtered sufficiently, and the infrared filtering and coating film still needs to be arranged on the infrared absorption plate.

Disclosure of Invention

The optical image lens, the image capturing device and the electronic device provided by the invention are provided with the plastic lens absorbing the long-wavelength red light, and the transmission distance of the plastic lens for the main light to pass through is properly configured, so that a better imaging effect is favorably obtained.

According to the present invention, an optical image lens is provided, which comprises a plurality of optical lenses. The optical image lens is provided with a long-wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power. The optical image lens satisfies the following conditions: FNO is less than or equal to 2.0; and the ratio of CP/CP0 is more than or equal to 0.5 and less than or equal to 2.32, wherein FNO is the aperture value of the optical image lens, CP is the penetration distance of the chief ray of the optical image lens in the imaging area of the central field of view to the range of 1.0 field of view through the long-wavelength red light absorption optical lens, and CP0 is the penetration distance of the chief ray of the optical image lens in the central field of view through the long-wavelength red light absorption optical lens.

According to another aspect of the present invention, an image capturing apparatus is provided, which includes the optical image lens described in the previous paragraph and an electronic sensor disposed on an image plane of the optical image lens.

According to the present invention, an electronic device is a mobile device, which is characterized by comprising the image capturing device as described in the previous paragraph.

According to another aspect of the present invention, an optical imaging lens includes a plurality of optical lenses. The optical image lens is provided with a long-wavelength red light absorption optical lens, wherein the long-wavelength red light absorption optical lens is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power. Wherein, the optical image lens satisfies the following conditions: CRAmax is more than or equal to 34.98; and CP/CP0 is more than or equal to 0.5 and less than or equal to 2.32; the maximum chief ray angle of the optical image lens is CRAmax, CP is the transmission distance of the chief ray in the imaging area of the optical image lens from the central view field to the range of 1.0 view field through the long-wavelength red light absorption optical lens, and CP0 is the transmission distance of the chief ray in the central view field through the long-wavelength red light absorption optical lens.

According to another aspect of the present invention, an optical image lens assembly includes a plurality of optical lenses, and a third optical lens from an object side to an image side of the optical image lens assembly has negative refractive power. The optical image lens is provided with a long-wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power. Wherein, the optical image lens satisfies the following conditions: CP/CP0 is more than or equal to 0.5 and less than or equal to 2.32; the CP is a transmission distance of a chief ray of the optical imaging lens in the central field of view to 1.0 field of view through the long-wavelength red-light absorbing optical lens, and the CP0 is a transmission distance of a chief ray of the optical imaging lens in the central field of view through the long-wavelength red-light absorbing optical lens.

When the FNO satisfies the above conditions, it contributes to an effective increase in the amount of light entering.

When the CP/CP0 meets the conditions, the method is favorable for obtaining better local color saturation, avoiding the imaging color cast of the off-axis field of view, and being favorable for filtering the infrared light to obtain better imaging effect.

Drawings

In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view illustrating an image capturing device according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an image capturing device according to a second embodiment of the present invention;

FIG. 3 is a schematic view of an electronic device according to a third embodiment of the invention;

FIG. 4 is a schematic view illustrating an electronic device according to a fourth embodiment of the invention; and

fig. 5 is a schematic view illustrating an electronic device according to a fifth embodiment of the invention.

[ notation ] to show

An electronic device: 10. 20, 30

An image taking device: 11. 21, 31

Aperture: 100. 200 of a chemical formula

Center of entrance pupil: 101. 201 (a-n) of the formula

A first optical lens: 110

An object-side surface: 111

Image-side surface: 112

A second optical lens: 120. 220 of a glass fiber reinforced plastic

An object-side surface: 121. 221 a

Image-side surface: 122. 222 to x-ray diffraction grating

A third optical lens: 230

An object-side surface: 231

Image-side surface: 232

A fourth optical lens: 140. 240 of the formula

An object-side surface: 141. 241,241, a method for producing the same

Image-side surface: 142. 242 and

a fifth optical lens: 150. 250 (R) and (B)

Object-side surface: 151. 251 (R)

Image-side surface: 152. 252 to k

A sixth optical lens: 260

An object-side surface: 261

Image-side surface: 262

Long wavelength red light absorbing optical lens: 170. 270 to k

An object-side surface: 171. 271A

Image-side surface: 172. 272 a chemical compound

Infrared ray filtering and coating film: 180. 280A

And (3) protecting glass: 190. 290 (a) of (b) of (c) and (d) of (d) 290

Imaging surface: 195. 295, and (295)

An electron-sensitive element: 196. 296 to et al

And (3) CP: the chief ray in the imaging area of the optical image lens penetrates through the penetration distance of the long wavelength red light absorption optical lens in the range from the central visual field to 1.0 visual field

CP0: the principal ray of the optical image lens passes through the transmission distance of the long wavelength red light absorption optical lens on the optical axis

T: transmittance of long wavelength red light absorbing optical lens

IT: penetration rate of infrared filtering coating film

T4560: the comprehensive average transmittance of all long wavelength red light absorbing optical lenses in the optical image lens at the wavelength of 450 nm-600 nm

IT4560: the comprehensive average penetration rate of the infrared filtering coating film at the wavelength of 450 nm-600 nm

T6570: the comprehensive average transmittance of all long wavelength red light absorbing optical lenses in the optical image lens at the wavelength of 650 nm-700 nm

IT6570: the comprehensive average penetration rate of the infrared filtering coating film at the wavelength of 650 nm-700 nm

T6771: the comprehensive average penetration rate of all long wavelength red light absorbing optical lenses in the optical image lens at the wavelength of 670 nm-710 nm

IT6771: the comprehensive average penetration rate of the infrared filtering coating film at the wavelength of 670 nm-710 nm

A550: absorption value of long wavelength red light absorption optical lens at wavelength of 550nm

A700: absorption value of long wavelength red light absorption optical lens at wavelength of 700nm

WLT50: the infrared ray filtering coating film has a wavelength of 50% transmittance

FNO: aperture value of optical image lens

CRAmax: maximum chief ray angle of optical image lens

TTL: the distance from one surface closest to the object side to an imaging surface of the optical image lens

IMGH: maximum image height of optical image lens

Detailed Description

The invention provides an optical image lens, which comprises a plurality of optical lenses, wherein the optical lenses comprise a plurality of plastic optical lenses and have refractive power and aspheric surfaces. The optical image lens is provided with a long-wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power.

The long wavelength red light absorbing optical lens satisfies the following conditions: CP/CP0 is more than or equal to 0.5 and less than or equal to 2.0, wherein CP is the penetration distance of the chief ray of the optical imaging lens in the central visual field to the range of 1.0 visual field through the long-wavelength red light absorption optical lens, and CP0 is the penetration distance of the chief ray of the optical imaging lens in the central visual field through the long-wavelength red light absorption optical lens. Therefore, the optimal state is achieved when the CP/CP0 tends to 1, when the CP/CP0 is smaller than the lower limit, the imaging color saturation is reduced, and when the CP/CP0 is larger than the upper limit, the imaging color of the off-axis field is deviated, and the existing infrared light filtering degree cannot be achieved. Preferably, it may satisfy the following condition: CP/CP0 is more than or equal to 0.8 and less than or equal to 1.2. Therefore, the wavelength of the optical lens with 50% transmittance is limited in a proper range (+ -7 nm).

According to the optical imaging lens of the present invention, the total average transmittance of all the long wavelength red light absorbing optical lenses at a wavelength of 650nm to 700nm is T6570, and the total average transmittance of all the long wavelength red light absorbing optical lenses at a wavelength of 450nm to 600nm is T4560, which satisfies the following conditions: t6570 is less than or equal to 50 percent; and T4560 is more than or equal to 80 percent. Therefore, the long-wavelength red light can be filtered, so that the image color distortion can be avoided, and the miniaturization of the optical image lens is facilitated.

According to the optical imaging lens of the present invention, the integrated average transmittance of all the long wavelength red light absorbing optical lenses at the wavelength of 670nm to 710nm is T6771, the absorption value of the long wavelength red light absorbing optical lens at the wavelength of 700nm is a700, and the absorption value of the long wavelength red light absorbing optical lens at the wavelength of 550nm is a550, which satisfies the following conditions: t6771 is less than or equal to 20%; and A700/A550 is not less than 10. Therefore, the color cast problem of the infrared filtering coating film can be inhibited.

The optical image lens according to the present invention may further include an aperture for controlling a maximum incident light amount at a center of the imaging area, and the long wavelength red light absorbing optical lens may have a positive refractive power at a paraxial region thereof. Therefore, the method can obtain the superior CP/CP0 change degree and avoid the problem of peripheral color cast.

According to the optical image lens of the present invention, the long wavelength red light absorbing optical lens can have refractive power and aspheric surface, and the long wavelength red light absorbing optical lens can be manufactured by injection molding. Therefore, the optical image lens is favorable for reducing the aberration loss degree when the optical image lens achieves the better CP/CP0 value.

According to the optical imaging lens of the present invention, the long wavelength red light absorbing optical lens can be made of thermoplastic plastics. Therefore, the optical processing precision of the long-wavelength red light absorption optical lens can be effectively improved.

According to the optical imaging lens of the present invention, the long wavelength red light absorbing optical lens can have long wavelength red light absorbing components uniformly distributed therein. Therefore, better surface precision and processing stability can be achieved. The long wavelength red absorbing component may be organic or organometallic and is commercially available as a product suitable for thermoplastics, such as the NIR adsorbent Materials for plastics (Thermal Resin) series of QCR Solutions Corp, or similar or equivalent products from other suppliers.

According to the optical image lens of the present invention, an image side is disposed with an image plane, wherein an infrared filtering coating film may be disposed in the optical image lens or between the optical image lens and the image plane. Therefore, the infrared light can be filtered, the material complexity of the long-wavelength red light absorption optical lens is reduced, and the production stability is improved. The infrared filtering coating can be arranged on a flat plate element between the optical image lens and the imaging surface, and also can be arranged on the surface of an optical lens which is relatively flat and has a relatively small incident angle of a chief ray in the optical image lens.

In addition, cesium-based oxide material such as CsWOx can also be added to the plastic optical lens to replace the above-mentioned infrared filtering coating film, which can help to reduce the thickness of the optical image lens.

According to the optical image lens of the present invention, the ir-cut coating film is transparent to visible light and is near-ir-cut, and the wavelength of the ir-cut coating film at 50% transmittance is WLT50, which satisfies the following conditions: WLT50 is more than or equal to 670nm. Therefore, the infrared filtering coating can drift in the short wavelength direction of the peripheral visual field and be covered by the long wavelength red light absorption optical lens, so that the central/peripheral color cast obvious degree is reduced. Preferably, it can satisfy the following conditions: WLT50 is more than or equal to 690nm, and infrared rays with more coating layers are used for filtering and coating. Therefore, the problem of the drift of the infrared filtering coating film in the short wavelength direction can be fully covered by the long wavelength red light absorption optical lens. Preferably, it can satisfy the following conditions: WLT50 is less than or equal to 730nm. Therefore, the method is beneficial to the component purification of the long-wavelength red light absorption optical lens and improves the production stability. In addition, the wavelength range of the ir-cut coating with 50% transmittance is from the visible red region to the near infrared region.

According to the optical image lens of the present invention, a protective glass may be further disposed, and the infrared ray filtering coating film is disposed on at least one surface of the protective glass. Therefore, the method is beneficial to the CP/CP0 change degree and avoids the problem of peripheral color cast.

According to the optical image lens of the present invention, the optical image lens may have one of the above-mentioned long wavelength red light absorbing optical lenses. Therefore, the filtering effect of the long wavelength red light is maintained, and the cost benefit is met. In addition, the optical image lens can be provided with a long-wavelength red light absorption optical lens according to the requirement, and can also be provided with more than two long-wavelength red light absorption optical lenses, so that the filtering wavelength band width is improved.

According to the present invention, an f-number of the optical image lens is FNO, a maximum chief ray angle of the optical image lens is CRAmax, a distance from an object side to an image plane of the optical image lens is TTL, and a maximum image height of the optical image lens is IMGH, which can satisfy the following conditions: FNO is less than or equal to 2.4; CRAmax is more than or equal to 20; and TTL/IMGH is more than or equal to 0.8 and less than or equal to 3.0. Therefore, the light inlet quantity is effectively improved, the effect of long-wavelength red light absorption components cannot be exerted due to too low light inlet quantity, the proportion of the total length and the image height of the optical image lens is properly controlled, the size of the optical image lens can be favorably reduced, and the miniaturization is realized.

All technical features of the optical image lens of the invention can be combined and configured to achieve corresponding effects.

In the optical image lens provided by the present invention, if the optical image lens includes two long wavelength red light absorbing optical lenses, the comprehensive average transmittance T6570 of all the long wavelength red light absorbing optical lenses at a wavelength of 650nm to 700nm is obtained by respectively calculating respective T6570 values by the two long wavelength red light absorbing optical lenses and then multiplying the calculated values, and so on if the plurality of long wavelength red light absorbing optical lenses are included.

In the optical image lens provided by the invention, a chief ray of the optical image lens is a light ray passing through the center of the entrance pupil, and the maximum image height in the image capturing area is defined as a 1.0F field of view.

In the optical image lens of the present invention, the arrangement of the diaphragm may be a front diaphragm or a middle diaphragm, and the arrangement of the diaphragm is used for controlling the maximum light entering amount of the optical image lens at the center position of the imaging area. The front diaphragm means a diaphragm disposed at an object side of the first optical lens in the imaging lens system, and the middle diaphragm means a diaphragm disposed between the first optical lens and the imaging surface. If the diaphragm is a front diaphragm, a longer distance can be generated between the Exit Pupil (Exit Pupil) and the imaging surface, so that the Exit Pupil has a Telecentric (telecentricity) effect, and the image receiving efficiency of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased; if the diaphragm is arranged in the middle, the wide-angle lens is beneficial to enlarging the field angle of the imaging lens system, so that the optical image lens has the advantage of a wide-angle lens.

In the optical image lens of the present invention, at least one aperture may be disposed before the first optical lens, between the optical lenses or behind the last optical lens, and the type of the aperture, such as flare aperture (Glare Stop) or Field Stop, can be used to reduce stray light, which is helpful to improve image quality.

The optical image lens of the present invention may be provided with an aperture, a lens barrel, a light-shielding element, a fixing element, a protective glass, a filter element, etc. according to requirements.

In the optical image lens of the present invention, the optical lens and the long wavelength red light absorbing optical lens may be made of plastic. When the optical lens is made of plastic, the production cost can be effectively reduced. In addition, the object-side surface and the image-side surface of the optical image lens can be Aspheric Surfaces (ASP), which can be easily made into shapes other than spherical surfaces to obtain more control variables for reducing the aberration and further reducing the number of optical lenses, thereby effectively reducing the total track length of the optical image lens. In addition, the plastic material can be replaced by Resin (Resin) material.

In the optical image lens provided by the invention, if the surface of the optical lens is a convex surface and the position of the convex surface is not defined, the surface of the optical lens can be a convex surface at a paraxial region; if the optical lens surface is concave and the concave position is not defined, it means that the optical lens surface can be concave at the paraxial region. In the optical image lens system provided by the present invention, if the optical lens element has positive refractive power or negative refractive power, or the focal length of the optical lens element can refer to the refractive power or focal length of the optical lens element at the paraxial region, the off-axis region, or the peripheral region thereof.

The image plane of the optical image lens of the present invention may be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing to the object side, depending on the corresponding electronic photosensitive element.

The optical image lens of the invention can also be applied to electronic devices such as three-dimensional (3D) image capturing, digital cameras, mobile products, digital flat panels, smart televisions, network monitoring equipment, motion sensing game machines, automobile data recorders, backing developing devices, wearable products and the like in many aspects. The electronic device disclosed in the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the image capturing device of the present invention.

The invention provides an image capturing device, which comprises the optical image lens and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on an imaging surface of the optical image lens. The long wavelength red light absorbing optical lens is arranged in the optical image lens, and the penetrating distance for the main light to pass through is properly configured, so that better local color saturation is obtained, imaging color cast of an off-axis field is avoided, and the infrared light filtering degree is facilitated. Preferably, the image capturing device may further include a Barrel (Barrel Member), a Holder (Holder Member), or a combination thereof.

The invention provides an electronic device, which can be a mobile device, comprising the image capturing device described in the previous section. Therefore, the imaging quality can be effectively improved. Preferably, the electronic device may further include a Control Unit (Control Unit), a Display Unit (Display), a Storage Unit (Storage Unit), a Random Access Memory (RAM), or a combination thereof.

The following provides a detailed description of the embodiments with reference to the accompanying drawings.

< first embodiment >

Fig. 1 is a schematic diagram illustrating an image capturing device according to a first embodiment of the invention. As shown in fig. 1, the image capturing device of the first embodiment includes an optical image lens (not shown) and an electronic photosensitive element 196. The optical image lens includes an entrance pupil center 101. The optical image lens includes, in order from an object side to an image side, an aperture stop 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 ir-cut coating 180, a cover glass 190, and an image plane 195, and the electronic photosensitive element 196 is disposed on the image plane 195 of the optical image lens.

The first optical lens element 110 with positive refractive power has an object-side surface 111 and an image-side surface 112 that are both aspheric, and the first optical lens element 110 is made of a plastic material, such as COC/COP material, for example, APL series of mitsui chemistry or ZEONEX series of ZEON.

The second optical lens element 120 with negative refractive power has an object-side surface 121 and an image-side surface 122 which are both aspheric, and the second optical lens element 120 is made of plastic material.

The long-wavelength red light absorbing optical lens element 170 with negative refractive power has an object-side surface 171 and an image-side surface 172 which are aspheric. The long wavelength red light absorbing optic 170 is a thermoplastic plastic material made by injection molding, the plastic material is a high refractive Polycarbonate (PC) material, such as EP series by MGC or SP series by imperial, which can also be replaced with Polyester (Polyester) materials, such as OKP series by OGC. The long wavelength red light absorbing optical lens 170 contains a long wavelength red light absorbing component, and the long wavelength red light absorbing component is a commercially available injection molding grade organometallic compound absorbing component, and the long wavelength red light absorbing component is uniformly mixed in the long wavelength red light absorbing optical lens 170.

The fourth optical lens element 140 with positive refractive power has an object-side surface 141 and an image-side surface 142 which are both aspheric, and the fourth optical lens element 140 is made of plastic material.

The fifth optical lens element 150 with negative refractive power has an object-side surface 151 and an image-side surface 152 which are both aspheric, and the fifth optical lens element 150 is made of plastic material.

The cover glass 190 is disposed between the fifth optical lens 150 and the image plane 195 and does not affect the focal length of the optical image lens.

The ir-cut coating 180 is disposed on an object-side surface (not labeled) of the protective glass 190, and is located between the optical image lens and the image plane 195, wherein the ir-cut coating 180 is transparent to visible light and filters near infrared light.

The FNO of the optical image lens is 2.00, the maximum CRA of the optical image lens is 35.8 degrees, and the TTL/IMGH of the optical image lens is 1.36.

Refer to table one below.

The first table shows the CP and CP/CP0 data of each optical lens element in the first embodiment of fig. 1, wherein P1-P5 sequentially represent the first optical lens element 110, the second optical lens element 120, the long wavelength red light absorbing optical lens element 170, the fourth optical lens element 140 and the fifth optical lens element 150 from the object side to the image side.

In the first embodiment, the long wavelength red light absorbing optical lens in the optical imaging lens is disposed on the third optical lens, and the CP/CP0 value thereof falls within a range of 0.98 to 1.04, which is the best choice for this embodiment, but if considering the production factor, the long wavelength red light absorbing optical lens 170 may be configured as the first optical lens, and the CP/CP0 value thereof falls within a range of 1.0 to 1.09, which is also an excellent choice.

Referring to the following two tables, T is the transmittance of the long wavelength red light absorbing optical lens, IT is the transmittance of the infrared filtering coating film, T4560 is the comprehensive average transmittance of the long wavelength red light absorbing optical lens at a wavelength of 450nm to 600nm, T6570 is the comprehensive average transmittance of the long wavelength red light absorbing optical lens at a wavelength of 650nm to 700nm, T677 is the comprehensive average transmittance of the long wavelength red light absorbing optical lens at a wavelength of 670nm to 710nm, a550 is the absorption value of the long wavelength red light absorbing optical lens at a wavelength of 550nm, and a700 is the absorption value of the long wavelength red light absorbing optical lens at a wavelength of 700 nm.

Table two shows transmittance data of the long wavelength red light absorbing optical lens 170 and the ir-filtered coating film 180 in the first embodiment, where the WLT50 of the ir-filtered coating film 180 is 709nm, but if it is desired to reduce the cost of the ir-filtered coating film 180, the WLT50 can be adjusted to 680-690 nm to relax the requirement of the coating layer number of the ir-filtered coating film 180 and the production specification. In addition, the definitions of the data in the tables of the following embodiments are the same as those of the tables one to two of the first embodiment, and are not repeated hereinafter.

< second embodiment >

Fig. 2 is a schematic view of an image capturing device according to a second embodiment of the invention. As shown in fig. 2, the image capturing device of the second embodiment includes an optical image lens (not labeled) and an electronic photosensitive element 296. The optical image lens includes an entrance pupil center 201. The optical image lens includes, in order from an object side to an image side, an aperture stop 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 ir-cut coating 280, a protective glass 290, and an image plane 295, and the electronic sensing element 296 is disposed on the image plane 295 of the optical image lens.

The stop 200 is used to control the maximum light-entering amount of the optical imaging lens at the center position of the imaging area.

The long wavelength red light absorbing optical lens 270 with positive refractive power has an object-side surface 271 and an image-side surface 272 that are aspheric, and the long wavelength red light absorbing optical lens 270 is adjacent to the aperture 200. The long wavelength red light absorbing optical lens 270 is made of a thermoplastic plastic material, and is manufactured by an injection molding technique, wherein the plastic material is a cyclic olefin polymer (COC/COP) material. The long-wavelength red-light absorbing optical lens 270 contains a long-wavelength absorbing component, and the long-wavelength red-light absorbing component is an organic absorbing component of a commercially available injection molding grade, and the long-wavelength red-light absorbing component is uniformly mixed in the long-wavelength red-light absorbing optical lens 270.

The second optical lens element 220 with negative refractive power has an object-side surface 221 and an image-side surface 222 which are both aspheric, and the second optical lens element 220 is made of a plastic material with high refractive index (PC), such as EP series of MGC or SP series of imperial people.

The third optical lens element 230 with negative refractive power has an object-side surface 231 and an image-side surface 232 which are both aspheric, and the third optical lens element 230 is made of plastic material.

The fourth optical lens element 240 with positive refractive power has an object-side surface 241 and an image-side surface 242 which are both aspheric, and the fourth optical lens element 240 is made of plastic material.

The fifth optical lens element 250 with negative refractive power has an object-side surface 251 and an image-side surface 252 which are both aspheric, and the fifth optical lens element 250 is made of plastic material.

The sixth optical lens element 260 with negative refractive power has an object-side surface 261 and an image-side surface 262 which are both aspheric, and the sixth optical lens element 260 is made of plastic material.

The cover glass 290 is disposed between the sixth optical lens 260 and the image plane 295 without affecting the focal length of the optical image lens.

The ir-cut film 280 is disposed on an object-side surface (not numbered) of the protection glass 290, and is located between the optical image lens and the image plane 295, and the ir-cut film 280 is transparent to visible light and filters near infrared rays.

The cesium-based oxide material may also be used to replace an infrared filtering coating, such as a cesium tungsten oxide (CsWOx) compound, which may be disposed on the surface of the optical lens or uniformly dispersed in the optical lens to achieve an infrared filtering effect and a low absorption effect on visible light, and may selectively replace the infrared filtering coating 280 when the material is used in an optical imaging lens.

The FNO of the optical image lens is 1.80, the maximum CRA of the optical image lens is 35.0 degrees, and the TTL/IMGH of the optical image lens is 1.48.

See table three below.

Table three shows CP and CP/CP0 data of each optical lens of the second embodiment, wherein P1 to P6 sequentially 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.

In the first embodiment, the long wavelength red light absorbing optical lens in the optical imaging lens is disposed on the first optical lens, and the CP/CP0 value thereof falls within 1.00 to 1.09, which is the best choice for this embodiment, but if considering the production factor, the long wavelength red light absorbing optical lens 270 may be disposed on the second optical lens, and the CP/CP0 value thereof falls within 1.00 to 1.14, which is also an excellent choice.

Refer to table four below.

Table four shows detailed transmittance data of the long wavelength red light absorbing optical lens 270 and the ir-cut coating 280 in the second embodiment, wherein the ir-cut coating 280 has a 50% transmittance of about 709nm.

In the second embodiment, the definition of the parameters is the same as that of the first embodiment, and is not described herein.

< third embodiment >

Fig. 3 is a schematic diagram illustrating an electronic device 10 according to a third embodiment of the invention. The electronic device 10 of the third embodiment is a smart phone, and the electronic device 10 includes an image capturing device 11, where the image capturing device 11 includes an optical image lens (not shown) and an electronic photosensitive element (not shown) according to the present invention, where the electronic photosensitive element is disposed on an image plane of the optical image lens.

< fourth embodiment >

Fig. 4 is a schematic view showing an electronic device 20 according to a fourth embodiment of the invention. The electronic device 20 of the fourth embodiment is a tablet computer, and the electronic device 20 includes an image capturing device 21, where the image capturing device 21 includes an optical image lens (not shown) and an electronic photosensitive element (not shown) according to the present invention, where the electronic photosensitive element is disposed on an image plane of the optical image lens.

< fifth embodiment >

Fig. 5 is a schematic view illustrating an electronic device 30 according to a fifth embodiment of the invention. The electronic Device 30 of the fifth embodiment is a Wearable Device (Wearable Device), the electronic Device 30 includes an image capturing Device 31, the image capturing Device 31 includes an optical image lens (not shown) and an electronic photosensitive element (not shown) according to the present invention, wherein the electronic photosensitive element is disposed on an image plane of the optical image lens.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An optical imaging lens, comprising:

a plurality of optical lenses;

wherein, the optical image lens is provided with a long wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long wavelength red light, is made of plastic and has refractive power;

wherein, the optical image lens satisfies the following conditions:

FNO is less than or equal to 2.0; and

0.5≤CP/CP0≤2.32；

wherein FNO is an aperture value of the optical imaging lens, CP is a transmission distance of a chief ray of the optical imaging lens in the central field of view to 1.0 field of view through the long wavelength red light absorbing optical lens, and CP0 is a transmission distance of a chief ray of the optical imaging lens in the central field of view through the long wavelength red light absorbing optical lens.

2. The optical imaging lens according to claim 1, characterized in that it satisfies the following conditions:

0.68≤CP/CP0≤2.0。

3. the optical imaging lens according to claim 2, characterized in that it satisfies the following conditions:

0.8≤CP/CP0≤1.2。

4. the optical imaging lens according to claim 3, wherein the following condition is satisfied:

0.98≤CP/CP0≤1.09。

5. the lens for optical imaging as claimed in claim 3, wherein the combined average transmittance of all the long wavelength red-light absorbing optical lens at wavelengths of 650nm to 700nm is T6570, and the combined average transmittance of all the long wavelength red-light absorbing optical lens at wavelengths of 450nm to 600nm is T4560, which satisfies the following conditions:

t6570 is less than or equal to 15 percent; and

T4560≥80％。

6. the lens assembly as claimed in claim 3, wherein the total average transmittance of all the long wavelength red-light absorbing optical lens elements at 670-710 nm is T6771, the absorption value of the long wavelength red-light absorbing optical lens element at 700nm is A700, the absorption value of the long wavelength red-light absorbing optical lens element at 550nm is A550, and the following conditions are satisfied:

t6771 is less than or equal to 20%; and

A700/A550≥30.37。

7. the lens system as claimed in claim 1, wherein an aperture is disposed on the lens system, the long wavelength red light absorbing optic is adjacent to the aperture, and the long wavelength red light absorbing optic has positive refractive power at a paraxial region.

8. The optical image lens assembly as claimed in claim 1, wherein the first or third optical lens from the object side to the image side of the optical image lens assembly is the long wavelength red light absorbing optical lens assembly.

9. The lens assembly as claimed in claim 3, wherein the long wavelength red light absorbing optical lens is manufactured by injection molding and is made of thermoplastic plastic.

10. The optical imaging lens of claim 9, wherein the thermoplastic is selected from at least one of a cycloolefin polymer, a high refractive polycarbonate, and a polyester.

11. The optical image lens assembly as claimed in claim 1, wherein an image plane is disposed on the image side of the optical image lens assembly, and an IR-cut coating is disposed in the optical image lens assembly or between the optical image lens assembly and the image plane.

12. The optical imaging lens of claim 11, wherein the ir-cut coating is transparent to visible light and near-ir-cut, and the wavelength of 50% transmittance of the ir-cut coating is WLT50, which satisfies the following conditions:

WLT50≥670nm。

13. the optical image lens as claimed in claim 12, wherein the ir-cut film has a wavelength WLT50 at 50% transmittance, which satisfies the following condition:

WLT50≥690nm。

14. the optical imaging lens as claimed in claim 12, wherein the ir-cut film has a wavelength WLT50 at 50% transmittance, which satisfies the following condition:

WLT50≤730nm。

15. the optical imaging lens of claim 12, wherein a protective glass is disposed in front of the imaging surface of the optical imaging lens, and the ir-cut coating is disposed on at least one surface of the protective glass.

16. The optical image lens system of claim 1, wherein a distance from an object side to an image plane of the optical image lens system is TTL, a maximum image height of the optical image lens system is IMGH, and the following conditions are satisfied:

0.8≤TTL/IMGH≤3.0。

17. an image capturing apparatus, comprising:

the optical imaging lens of claim 1; and

an electronic photosensitive element is arranged on an imaging surface of the optical image lens.

18. An electronic device, being a mobile device, comprising:

the image capturing apparatus of claim 17.

19. An optical imaging lens, comprising:

a plurality of optical lenses;

wherein, the optical image lens is provided with a long-wavelength red light absorption optical lens which is transparent to visible light and capable of filtering long-wavelength red light, is plastic and has refractive power;

wherein, the optical image lens satisfies the following conditions:

CRAmax is more than or equal to 34.98; and

0.5≤CP/CP0≤2.32；

the maximum chief ray angle of the optical image lens is CRAmax, CP is a transmission distance of a chief ray in the central field of view to 1.0 field of view in the imaging area of the optical image lens through the long-wavelength red light absorbing optical lens, and CP0 is a transmission distance of a chief ray in the central field of view through the long-wavelength red light absorbing optical lens.

20. The optical imaging lens of claim 19, wherein the following condition is satisfied:

0.8≤CP/CP0≤1.2。

21. the optical imaging lens of claim 20, wherein the following condition is satisfied:

0.98≤CP/CP0≤1.09。

22. the lens system as claimed in claim 20, wherein an aperture is disposed on the lens system, the long wavelength red light absorbing optic is adjacent to the aperture, and the long wavelength red light absorbing optic has positive refractive power at a paraxial region.

23. The optical image lens assembly as claimed in claim 20, wherein the first or third optical lens from the object side to the image side of the optical image lens assembly is the long wavelength red light absorbing optical lens assembly.

24. The optical imaging lens according to claim 23, wherein the material of the long wavelength red light absorbing optical lens is selected from at least one of a cycloolefin polymer, a high refractive polycarbonate, and a polyester.

25. The optical image lens assembly of claim 19, wherein an image plane is disposed on the image side of the optical image lens assembly, and wherein an IR-cut film is disposed in the optical image lens assembly or between the optical image lens assembly and the image plane.

26. An optical imaging lens, comprising:

a plurality of optical lenses, wherein a third optical lens from the object side to the image side of the optical image lens has negative refractive power;

wherein, the optical image lens satisfies the following conditions:

0.5≤CP/CP0≤2.32；

the CP is a transmission distance of a chief ray of the optical imaging lens in the range from the central field of view to 1.0 field of view through the long-wavelength red-light absorbing optical lens, and the CP0 is a transmission distance of a chief ray of the optical imaging lens in the central field of view through the long-wavelength red-light absorbing optical lens.

27. The optical imaging lens of claim 26, wherein the following condition is satisfied:

0.8≤CP/CP0≤1.2。

28. the optical imaging lens of claim 27, wherein the following conditions are satisfied:

0.98≤CP/CP0≤1.09。

29. the optical image lens as claimed in claim 27, wherein an aperture is disposed on the optical image lens, the long wavelength red light absorbing optical lens is adjacent to the aperture, and the long wavelength red light absorbing optical lens has positive refractive power at a paraxial region.

30. The lens assembly as claimed in claim 27, wherein the first or third optical lens from the object side to the image side of the lens assembly is the long wavelength red light absorbing lens.

31. The optical imaging lens according to claim 30, wherein the material of the long-wavelength red-light-absorbing optical lens is selected from at least one of cycloolefin polymer, high refractive polycarbonate, and polyester.

32. The optical image lens of claim 26, wherein an image plane is disposed on the image side of the optical image lens, and wherein an IR-cut film is disposed in the optical image lens or between the optical image lens and the image plane.