CN212965587U - Optical lens and electronic device - Google Patents

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises from an object side to an image side along an optical axis: a front lens group; the optical filter comprises a cut-off layer, the cut-off layer is used for filtering imaging light transmitted by the front lens group, and the maximum clear aperture D of the object side surface of the optical filter and the image height IMA corresponding to the maximum field angle on the imaging surface of the optical lens meet the following requirements: D/IMA is more than or equal to 0.3 and less than or equal to 1.8; and a rear lens group. This optical imaging lens is through setting up the light filtering piece between leading lens battery and rearmounted lens battery for the radial dimension of light filtering piece reduces, and then makes optical imaging lens have miniaturized characteristics, and has at least one beneficial effect such as low cost, structural strength height, ghost image intensity weak, wave band skew are little.

Description

Optical lens and electronic device

Technical Field

The present disclosure relates to the field of optical elements, and more particularly, to an optical lens and an electronic device.

Background

An automobile is a very popular vehicle on which a vehicle-mounted lens can be arranged to acquire information outside the automobile. Especially, with the continuous development of the automatic driving technology, the demand of the vehicle-mounted lens on the automobile is more and more demanding.

Since the driving environment of the automobile is complicated and changeable, the ambient light is complicated. In order to avoid the interference of the vehicle-mounted lens from the ambient light during the process of capturing light for imaging, a filtering device is usually provided to reserve the corresponding wavelength band and filter out other wavelength bands. Meanwhile, the optical lens is generally designed in a direction of miniaturization due to a limitation of an installation space, for example, the shorter the total optical length is, the better.

The filtering is usually performed by disposing a filter between the lens assembly and the chip. However, the chip is generally provided with a cover glass on the object side. The distance between the protective glass and the optical filter is short, so that convergent halos are easily generated, and further imaging pictures are interfered. In addition, due to the requirement of miniaturization of the optical lens, when the optical lens is used, the incident angle of the marginal ray is relatively large at the rear end lens, and further, when the marginal ray passes through the color filter at the rear end, the transmittance and the reflectivity are greatly deviated. The high reflectivity of the edge rays at the color filter causes ghost images, halos, and loss of transmittance.

Therefore, an optical lens that is small in size and weak in ghost intensity is desired.

SUMMERY OF THE UTILITY MODEL

An aspect of the present disclosure provides an optical lens assembly, in order from an object side to an image side along an optical axis, comprising: a front lens group; the optical filter comprises a cut-off layer, the cut-off layer is used for filtering imaging light transmitted by the front lens group, and the maximum clear aperture D of the object side surface of the optical filter and the image height IMA corresponding to the maximum field angle on the imaging surface of the optical lens can meet the following requirements: D/IMA is more than or equal to 0.3 and less than or equal to 1.8; and a rear lens group.

In one embodiment, the filter is formed by an integral cut-off layer.

In one embodiment, the cut-off layer has optical power.

In one embodiment, the cut-off layer has no optical power.

In one embodiment, the filter further comprises a light transmissive substrate for carrying the cut-off layer.

In one embodiment, the light transmissive substrate has optical power. A light-transmissive substrate having optical power may be used as one lens element in the lens stack. By disposing the cut-off layer on the lens, the substrate of the filter can be saved and the number of assembly processes can be reduced, thereby reducing the cost.

In one embodiment, the front lens group includes a first lens, a second lens, and a third lens disposed in order from an object side to an image side along an optical axis; wherein the first lens has a negative focal power; the second lens has negative focal power; the third lens has positive focal power; the light-transmissive substrate has positive optical power.

In one embodiment, the light transmissive substrate is flat glass.

In one embodiment, the front lens group includes a first lens, a second lens, and a third lens disposed in order from an object side to an image side along an optical axis; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from the object side to the image side along the optical axis; the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has positive focal power, and has a convex object-side surface and a concave image-side surface.

In one embodiment, the front lens group includes a first lens, and the rear lens group includes a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are disposed in order from an object side to an image side along an optical axis; the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has positive focal power, and the sixth lens has negative focal power; the second lens and the third lens form a first cemented lens, and the fifth lens and the sixth lens form a second cemented lens.

In one embodiment, the front lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens; the rear lens group comprises a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from the object side to the image side along the optical axis; the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the sixth lens has positive focal power, and the seventh lens has negative focal power; the object side surface of the seventh lens and the image side surface of the seventh lens are respectively provided with an inflection point.

In one embodiment, the cut-off layer is an infrared cut-off film, an infrared band-pass film, or a visible-light infrared double-pass film.

In one embodiment, the cut-off layer has a pass-through region having a transmittance of greater than 50%, the pass-through region including a high-transmittance region having an average transmittance of greater than 90%.

In one embodiment, the chief ray angle CRA of the maximum field of view at the cut-off layer and the image height IMA corresponding to the maximum field angle on the imaging plane of the optical lens may satisfy: CRA/IMA is more than or equal to 1 and less than or equal to 8.

In one embodiment, the total optical length TTL of the optical lens and the total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 10.

In one embodiment, the chief ray angle CRA of the maximum field of view at the cutoff layer and the maximum field angle FOV of the optical lens may satisfy 1 ≦ FOV/CRA ≦ 7.

In one embodiment, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height IMA corresponding to the maximum field angle on the imaging plane of the optical lens may satisfy: TTL/IMA/FOV is less than or equal to 0.2.

In one embodiment, the back focus BFL of the optical lens and the total optical length TTL of the optical lens may satisfy: BFL/TTL is less than or equal to 0.35.

In one embodiment, the chief ray angle CRA of the maximum field of view at the cutoff layer may satisfy: CRA is less than or equal to 40.

In one embodiment, the optical lens further includes a stop disposed between the optical filter and the front lens group.

In one embodiment, the lens barrel further comprises a mounting cavity; the front lens group, the rear lens group and elements arranged on the optical axis between the front lens group and the rear lens group are all arranged in the mounting cavity.

In one embodiment, the filter is located at a midpoint on the optical axis between the object side surface of the front lens group to the imaging surface of the optical lens.

In one embodiment, the bearing component is arranged in the installation cavity; the bearing part comprises a diaphragm hole penetrating along the optical axis direction and a mounting groove arranged on the image side of the diaphragm hole, and the mounting groove is used for mounting the optical filtering piece.

In one embodiment, when the cut-off layer is an infrared cut-off film, the cut-off layer may have a light-transmitting section having a transmittance of more than 50%, a left boundary frequency λ 1 of the light-transmitting section of the cut-off layer may satisfy λ 1 ═ 410nm ± 10nm, and a right boundary frequency λ 2 of the light-transmitting section of the cut-off layer may satisfy λ 2 ═ 680nm ± 30 nm. Illustratively, the light transmission interval includes a high transmission interval having an average transmittance of more than 90%, and the high transmission interval is a frequency interval of 420nm to 650 nm.

In one embodiment, when the cut-off layer is an infrared band-pass film, the cut-off layer may have a light-passing section having a transmittance of more than 50%, a left boundary frequency λ 1 of the light-passing section of the cut-off layer may satisfy λ 1 ═ 800nm ± 10nm, and a right boundary frequency λ 2 of the light-passing section of the cut-off layer may satisfy λ 2 ═ 1000nm ± 30 nm. Illustratively, the light-transmitting interval may include a high-transmittance interval having an average transmittance of more than 90%, the high-transmittance interval being a frequency interval of 830nm to 950 nm.

In one embodiment, when the cut-off layer is an infrared band-pass film, the cut-off layer may have a light-passing section having a transmittance of more than 50%, a left boundary frequency λ 1 of the light-passing section of the cut-off layer may satisfy λ 1 ═ 800nm ± 10nm, and a right boundary frequency λ 2 of the light-passing section of the cut-off layer may satisfy λ 2 ═ 900nm ± 10 nm. Illustratively, the light transmission interval may include a high transmission interval having an average transmittance of more than 90%, and the high transmission interval is a frequency interval of 830nm to 880 nm.

In one embodiment, when the cut-off layer is an infrared band-pass film, the cut-off layer may have a light-passing section having a transmittance of more than 50%, a left boundary frequency λ 1 of the light-passing section of the cut-off layer may satisfy λ 1 ═ 900nm ± 10nm, and a right boundary frequency λ 2 of the light-passing section of the cut-off layer may satisfy λ 2 ═ 1000nm ± 10 nm. Illustratively, the light-transmitting interval may include a high-transmission interval having an average transmittance of more than 90%, and the high-transmission interval is a frequency interval of 930nm to 980 nm.

In one embodiment, when the cut-off layer is a visible light and infrared double-pass film, the cut-off layer may have a visible light pass interval and an infrared pass interval, which have a transmittance of more than 50%; the left boundary frequency λ 1 of the visible light transmittance interval of the cut-off layer may satisfy λ 1 ═ 410nm ± 10nm, and the right boundary frequency λ 2 of the visible light transmittance interval of the cut-off layer may satisfy λ 2 ═ 680nm ± 30 nm. Illustratively, the visible light transmittance interval includes a visible light high transmittance interval having an average transmittance of more than 90%, and the visible light high transmittance interval is a frequency interval of 420nm to 650 nm. Illustratively, the infrared light transmission interval may include an infrared high-transmission interval having an average transmittance of greater than 90%, and the infrared high-transmission interval is a frequency interval of 845nm to 855 nm.

Another aspect of the present application provides an electronic device, which includes the optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

The application provides an optical imaging lens through set up the light filtering piece between leading battery of lens and rearmounted battery of lens, is favorable to reducing optical imaging lens's back burnt. The optical imaging lens meets the requirement of miniaturization, the usable focusing space is increased, and the optical imaging lens is convenient to assemble with a chip.

Also, light rays at the front or rear end of the lens group diverge. When the filter means is provided at these two places, the volume thereof is large. The application provides an optical imaging lens, its light filter sets up the inside at whole lens group. The light rays at the position of the light filtering piece are flat and gathered, and the volume of the light filtering piece is smaller, so that the cost can be reduced. Meanwhile, because the light at the position of the light filtering piece is flat, the band offset when the light is filtered is reduced, and the transmittance is improved.

The filter is arranged in front of the rear lens group, so that the filter can be far away from the protective glass. Because the light filtering piece and the protective glass both have higher reflectivity, the distance between the light filtering piece and the protective glass can reduce the energy level of ghost images generated by the light filtering piece and the protective glass.

In addition, the filter is thin and light, and thus is easily broken. The light filtering piece is arranged in the middle of the whole lens group, so that the risk of breakage can be reduced. And through the mechanism design, the breakage risk of the optical filter can be further reduced.

The application provides an optical imaging lens is through setting up the light filtering piece between leading battery of lens and rearmounted battery of lens for the radial dimension of light filtering piece reduces, and then makes optical imaging lens have miniaturized characteristics, and has at least one beneficial effect such as low cost, structural strength height, ghost image intensity are weak, the wave band skew is little.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

FIG. 1 illustrates a transmittance curve of an infrared cut film provided in accordance with the present application;

FIG. 2 illustrates a transmission curve for an infrared bandpass film provided in accordance with the present application;

FIG. 3 illustrates a transmission curve for another infrared bandpass film provided in accordance with the present application;

FIG. 4 illustrates a transmission curve for yet another infrared bandpass film provided in accordance with the present application;

FIG. 5 illustrates a transmittance curve for a visible-light infrared double pass film provided in accordance with the present application;

fig. 6 is a schematic structural view showing an optical lens according to embodiment 1 of the present application;

fig. 7 shows a cross-sectional view of an optical filter according to embodiment 1 of the present application;

fig. 8 is a schematic view showing an optical path structure of an optical lens according to embodiment 1 of the present application;

fig. 9 is a schematic structural view showing an optical lens according to embodiment 2 of the present application;

fig. 10 is a schematic structural view showing an optical lens according to embodiment 3 of the present application;

fig. 11 shows a schematic structural view of an optical lens according to embodiment 4 of the present application;

fig. 12 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 13 is a schematic structural view showing an optical lens according to embodiment 6 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the image side is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles and other aspects of the present application are described in detail below.

The application provides an optical lens includes: the lens system comprises a front lens group, a filter and a rear lens group. The front lens group, the light filtering element and the rear lens group are sequentially arranged along the object side to the image side on the optical axis. Imaging light rays collected by the optical lens sequentially pass through the front lens group, the light filtering piece and the rear lens group to irradiate on an imaging surface, and then image on the imaging surface.

In an exemplary embodiment, a stop is further included disposed between the front lens group and the filter. The distance between the diaphragm and the cut-off layer on the optical axis is less than 0.15 mm. In particular less than 0.12 mm. Illustratively, the diaphragm is disposed in an object-side direction of the cut-off layer. Exemplarily, the diaphragm is arranged at the filter. For example, a diaphragm is arranged at the cut-off layer of the filter, the inner circumference of which diaphragm matches the outer circumference of the cut-off layer. The arrangement of the diaphragm on the object side of the optical filter can further improve the imaging quality of the optical lens.

The filter includes a cut-off layer for filtering the imaging light propagating through the front lens group. Illustratively, the optical filter further comprises a light transmissive substrate for carrying the cut-off layer. The light-transmitting substrate may be a flat glass or plastic plate having no optical power, or may be a lens having optical power. The cut-off layer is arranged on the object side surface and/or the image side surface of the light-transmitting substrate and is used for filtering light transmitted from the object side direction, transmitting the light of the response waveband and intercepting the light of the non-response waveband. Illustratively, the optical power of the filter is determined by the light-transmitting substrate, but both the cut-off layer and the light-transmitting substrate may be set to have optical powers, and the optical power of the filter is the combined optical power of the cut-off layer and the light-transmitting substrate. Of course, the filter may include only the cut-off layer, and the thickness and shape of the cut-off layer may be adjusted according to the actual situation. The cut-off layer is made, for example, in the shape of a lens having optical power.

Illustratively, the optical lens further includes a lens barrel having a mounting cavity. The mounting cavity is used for mounting the front lens group, the rear lens group and each optical element arranged between the front lens group and the rear lens group on the optical axis. Specifically, these optical elements may include a filter, a lens having optical power, a diaphragm, and the like for adjusting the imaging light. The lens barrel can better define the position relation among the optical elements, and the image side end of the lens barrel can also be used for connecting with an external device, such as an imaging element. For example, the filter is located at a midpoint on the optical axis between the object side surface of the front lens group to the imaging surface. The object side surface of the front lens group may be an object side surface of a lens closest to the object side among the lenses. This midpoint is also exemplarily a midpoint of the lens barrel in the optical axis direction. Illustratively, the cut-off layer is located at the midpoint.

The application provides an optical lens is when formation of image, and imaging light is constantly adjusted after getting into leading battery of lens, and whole imaging light beam is constantly gathered together at marginal light, and has certain divergence again behind this mid point. Therefore, when the light filtering piece is arranged in the middle of the optical lens, the light rays passing through the light filtering piece can be folded and flattened, and if the light filtering piece is arranged in the front or the rear of the optical lens, the light rays passing through the light filtering piece are relatively diffused, so that the radial size required by the light filtering piece can be reduced by arranging the light filtering piece in the middle of the lens, the size of the light filtering piece is further reduced, and the manufacturing cost of the light filtering piece is reduced.

Simultaneously, the optical lens that this application provided still has at least one beneficial effect such as miniaturization, structural strength height, imaging quality are good. In particular, since the optical filter is located between the front lens group and the rear lens group, the optical lens can have a small back focus. Meanwhile, the optical lens meets the requirement of miniaturization, the available focusing space is increased, and the optical lens is convenient to assemble with a chip. And because the light filtering piece is lighter and thinner, the light filtering piece can be damaged or even broken under the action of stress when the optical lens is assembled or under the action of external force when the optical lens is used, and the risk of breakage of the light filtering piece can be reduced by arranging the light filtering piece in the middle of the lens. In addition, when the optical filter is disposed at the rear end of the optical lens, the light passing through the optical filter is relatively divergent, and the wide-angle light filtered by the optical filter generates a band shift. When the light filtering piece is arranged in the middle of the lens, light rays are flat, and the wave band deviation of the filtered light ray wave band is small, so that the final imaging quality is good.

In an exemplary embodiment, the optical lens further includes a bearing member. The bearing part comprises a diaphragm hole and a mounting groove. The diaphragm hole penetrates through the bearing part along the direction of the optical axis. The mounting groove is used for mounting the filter element, and the inner diameter of the mounting groove is generally larger than the aperture of the diaphragm hole. The mounting groove may be located image-side of the diaphragm aperture. The bearing part and the filter part are arranged in the lens barrel together. Specifically, the cut-off layer may be located approximately at the middle of the lens barrel in the optical axis direction.

The optical lens provided by the application can be well matched with an imaging element. The filter is located in the middle of the optical lens, and the filter is far away from the protective glass of the imaging element on the optical axis. Although both the filter and the cover glass have high reflectivity, the energy level of ghost images generated by the filter and the cover glass is reduced.

In an exemplary embodiment, the cut-off layer is an infrared cut-off film, an infrared band-pass film, or a visible-light infrared double-pass film. Different types of cut-off layers can make the optical lens of the present application suitable for different use environments or for dedicated devices.

Referring to fig. 1, in an exemplary embodiment, the cut-off layer is an infrared cut-off film, when the cut-off layer has a light-passing interval (response band) having a transmittance of more than 50%, the light-passing interval of the cut-off layer satisfies: λ 1 is 410nm ± 10nm, and λ 2 is 680nm ± 30nm, where λ 1 is a left boundary frequency (i.e., a low-frequency side boundary frequency) of the light-passing section, and λ 2 is a right boundary frequency (i.e., a high-frequency side boundary frequency) of the light-passing section of the cut-off layer. Illustratively, the pass interval is a frequency interval of 410nm to 670 nm. Specifically, the light-transmitting interval may include a high-transmittance interval having an average transmittance of more than 90%, and the high-transmittance interval is a frequency interval of 420nm to 650 nm. The infrared cut-off film can cut off infrared rays better and allow light in a response waveband in visible light to pass through better. The optical lens with the infrared cut-off film can have better imaging quality in the daytime or in the environment with sufficient illumination.

Referring to fig. 2, in an exemplary embodiment, the cut-off layer is an infrared band-pass film, when the cut-off layer has a light-passing interval with a transmittance greater than 50%, the light-passing interval of the cut-off layer satisfies: λ 1 is 800nm ± 10nm, and λ 2 is 1000nm ± 30nm, where λ 1 is a left boundary frequency (i.e., a low-frequency side boundary frequency) of the light-transmitting section, and λ 2 is a right boundary frequency (i.e., a high-frequency side boundary frequency) of the light-transmitting section of the cut-off layer. Illustratively, the pass interval is a frequency interval of 810nm to 980 nm. Specifically, the light-transmitting interval may include a high-transmittance interval having an average transmittance of more than 90%, and the high-transmittance interval is a frequency interval of 830nm to 950 nm. The infrared band-pass film can enable light in a response waveband in an infrared waveband to better pass through, and can better cut off visible light and light in a waveband of more than 980 nm.

Referring to fig. 3, in an exemplary embodiment, the cut-off layer is another infrared band-pass film, when the cut-off layer has a light-passing interval with a transmittance greater than 50%, and the light-passing interval of the cut-off layer satisfies: λ 1 ═ 800nm ± 10nm, λ 2 ═ 900nm ± 10 nm; where λ 1 is a left boundary frequency (i.e., a low-frequency side boundary frequency) of the light-passing section, and λ 2 is a right boundary frequency (i.e., a high-frequency side boundary frequency) of the light-passing section of the cut-off layer. Illustratively, the pass interval is a frequency interval of 800nm to 895 nm. Specifically, the light transmission interval may include a high transmission interval having an average transmittance of greater than 90%, and the high transmission interval is a frequency interval of 830nm to 880 nm. The infrared band-pass film can enable light in a smaller interval (near-infrared interval) in an infrared band to better pass through, and can cut off light in a non-response band.

Referring to fig. 4, in an exemplary embodiment, the cut-off layer is another infrared band-pass film, when the cut-off layer has a light-passing interval with a transmittance greater than 50%, and the light-passing interval of the cut-off layer satisfies: λ 1 is 900nm ± 10nm, and λ 2 is 1000nm ± 10nm, where λ 1 is a left boundary frequency (i.e., a low-frequency side boundary frequency) of the light-transmitting section, and λ 2 is a right boundary frequency (i.e., a high-frequency side boundary frequency) of the light-transmitting section of the cut-off layer. Illustratively, the pass interval is a frequency interval of 900nm to 1000 nm. Specifically, the light transmission interval may include a high transmission interval having an average transmittance of more than 90%, and the high transmission interval is a frequency interval of 930nm to 980 nm. The infrared band-pass film can enable light in a response waveband in an infrared waveband to better pass through and cut off light in a non-response waveband.

Referring to fig. 5, in an exemplary embodiment, the cut-off layer is a visible light infrared double-pass film when the cut-off layer has a visible light pass interval and an infrared pass interval having a transmittance of more than 50%; the visible light transmission interval of the cut-off layer satisfies: λ 1 is 410nm ± 10nm, and λ 2 is 680nm ± 30nm, where λ 1 is the left boundary frequency of the visible light transmission interval (i.e., the low-frequency side boundary frequency), and λ 2 is the right boundary frequency of the visible light transmission interval of the cut-off layer (i.e., the high-frequency side boundary frequency). Wherein, the visible light transmission interval can include a visible light high-transmission interval with the average transmittance of more than 90%, and the visible light high-transmission interval is a frequency interval from 420nm to 650 nm. Specifically, the infrared light transmission interval may include an infrared high-transmission interval having an average transmittance of greater than 90%, and the infrared high-transmission interval is a frequency interval of 845nm to 855 nm. The visible light infrared double-pass film can enable light in a response waveband to better pass through and cut off a non-response waveband.

In an exemplary embodiment, an optical lens according to the present application may satisfy 0.3 ≦ D/IMA ≦ 1.8, where D is a maximum clear aperture of an object side surface of the optical filter, and IMA is an image height on an imaging plane of the optical lens corresponding to a maximum angle of view. The optical lens satisfies that D/IMA is more than or equal to 0.3 and less than or equal to 1.8, the light-transmitting aperture of the optical filter is small, and the setting position is proper, so that the miniaturization of the optical lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy 1 ≦ FOV/CRA ≦ 7, where FOV is a maximum field angle of the optical lens and CRA is a chief ray angle of a maximum field of view at a cutoff layer. The FOV/CRA is more than or equal to 1 and less than or equal to 7, the size of the field of view of the optical lens can be effectively maintained, and the angle of light rays incident on the electronic photosensitive element matched with the optical lens can be reduced. And further, the photosensitive sensitivity of the electronic photosensitive element can be improved, so that the imaging quality is improved. More specifically, the FOV and CRA may satisfy: FOV/CRA is more than or equal to 1.5 and less than or equal to 6.

In an exemplary embodiment, an optical lens according to the present application may satisfy 1 ≦ CRA/IMA ≦ 8, where CRA is a chief ray angle of a maximum field of view at a cutoff layer and IMA is an image height on an imaging plane of the optical lens corresponding to a maximum field angle. The CRA/IMA is more than or equal to 1 and less than or equal to 8, the size of the visual field of the optical lens can be effectively maintained, and the angle of light rays incident on an electronic photosensitive element matched with the optical lens can be reduced. Thereby improving the sensitivity of the electronic photosensitive element. More specifically, CRA and IMA may satisfy: CRA/IMA is more than or equal to 1 and less than or equal to 7.

In an exemplary embodiment, an optical lens according to the present application may satisfy TTL/F ≦ 10, where TTL is the total optical length of the optical lens, i.e., the distance on the optical axis from the object side surface of the front lens group to the image plane, and F is the total effective focal length of the optical lens. The TTL/F is less than or equal to 10, the length of the optical lens can be shortened, and the optical lens has the characteristic of miniaturization. More specifically, TTL and F may satisfy: TTL/F is less than or equal to 8.

In an exemplary embodiment, an optical lens according to the present application may satisfy a CRA ≦ 40, where the CRA is a chief ray angle of a maximum field of view at a cutoff layer. The optical lens meets the condition that CRA is less than or equal to 40, so that light rays at the cut-off layer are gentle, the deviation of the light rays is small, and the imaging quality of the optical lens is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy BFL/TTL ≦ 0.35, where BFL is a back focus of the optical imaging lens, i.e., an on-axis distance from an image-side surface of a lens closest to an imaging surface in the rear lens group to the imaging surface, and TTL is an optical total length of the optical lens. The optical lens meets the condition that BFL/TTL is less than or equal to 0.35, can have shorter back focus, and further can have larger available focusing space while meeting the requirement of miniaturization.

In an exemplary embodiment, an optical lens according to the present application may satisfy TTL/IMA/FOV ≦ 0.2, where TTL is an optical total length of the optical lens, FOV is a maximum angle of view of the optical lens, and IMA is an image height on an imaging plane of the optical lens corresponding to the maximum angle of view. The optical imaging lens which meets the requirements that TTL/IMA/FOV is less than or equal to 0.2 has the characteristic of miniaturization.

In an exemplary embodiment, the front lens group and/or the rear lens group may include a lens having an aspherical mirror surface. The planar arrangement of the lens is beneficial to improving the resolution quality. Illustratively, all lenses have spherical mirror surfaces. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. The aspheric lens helps to correct system aberration and improve resolving power.

In some exemplary embodiments, the light transmissive substrate has optical power. I.e. the cut-off layer is arranged on the object-side and/or image-side surface of the lens having optical power. In other examples, the light-transmissive substrate is a flat glass sheet having no optical power. When the optical filter is an optical lens with a cut-off layer, the base body of the optical filter can be saved, the assembly procedures can be reduced, and the cost can be reduced.

Illustratively, the optical lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis. Illustratively, the filter is located between the third lens and the fourth lens and the filter is located at a midpoint between the object side surface of the first lens and the imaging surface. Illustratively, the first lens has a negative optical power; the second lens has negative focal power; the third lens has positive focal power; the light filtering part is positioned between the third lens and the fourth lens, and the light-transmitting substrate has positive focal power; the fourth lens has positive focal power; the fifth lens has a positive optical power.

Illustratively, the second lens and the third lens are cemented to form a cemented lens. The second lens with the concave object side surface and the concave image side surface and the third lens with the convex object side surface and the convex image side surface are glued, so that light rays emitted by the first lens are smoothly transited to an imaging surface, the total length of an optical system is reduced, various aberrations of the optical system are corrected, and the optical performances of improving the resolution of the system, optimizing distortion, CRA and the like are realized on the premise that the optical system is compact in structure. The gluing mode adopted between the lenses has at least one of the following advantages: self color difference is reduced, tolerance sensitivity is reduced, and the integral color difference of the system is balanced through the residual partial color difference; reducing the air space between the two lenses, thereby reducing the overall length of the system; the assembling parts between the lenses are reduced, so that the working procedures are reduced, and the cost is reduced; the tolerance sensitivity problems of inclination/core deviation and the like generated in the assembling process of the lens unit are reduced, and the production yield is improved; the light quantity loss caused by reflection among the lenses is reduced, and the illumination is improved; further reducing the curvature of field and effectively correcting the off-axis point aberration of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration so as to improve the resolving power, and enables the optical system to be compact as a whole and meet the miniaturization requirement. The aspherical lens of the cemented lens is used for further improving the resolution quality.

In other embodiments, the light-transmitting substrate has no optical power, and the optical lens may further include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are disposed in order from an object side to an image side along an optical axis. Illustratively, the first lens has a negative power, with a convex object-side surface and a concave image-side surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has positive focal power, and has a convex object-side surface and a concave image-side surface. The light filter can be arranged between any two lenses.

Illustratively, the fourth lens and the fifth lens are cemented to form a cemented lens. Cemented lenses can be used to minimize or eliminate chromatic aberration. The cemented lens used in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby realizing high resolution and improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

According to the optical lens of the above embodiment of the present application, through reasonable setting of each lens shape and focal power, at least one beneficial effect that the optical system has high resolution, good imaging quality and the like can be realized under the condition of only using six lenses. Meanwhile, the optical system also meets the requirements of small lens size, low sensitivity and high production yield and low cost. The optical lens also has the characteristic of smaller CRA (crazing code), stray light generated when the rear end of light rays is emitted to the lens barrel is avoided, the optical lens can be well matched with a vehicle-mounted chip, and color cast and dark corner phenomena cannot be generated. In an exemplary embodiment, each of the lenses having optical power in the optical lens may be made of glass. The optical lens made of glass can inhibit the deviation of the back focus of the optical lens along with the temperature change so as to improve the stability of the system. Meanwhile, the glass material is adopted, so that the problem that the normal use of the lens is influenced due to the imaging blur of the lens caused by high and low temperature changes in the use environment can be avoided. Specifically, when the resolution quality and reliability are focused, the lenses in the front lens group and the lenses in the rear lens group may be both glass aspherical lenses. Of course, in applications where temperature stability is less desirable, the lenses in the optical lens may also be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although two-piece and six-piece lenses are exemplified in the embodiments. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 6 to 8. Fig. 6 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 6, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a filter E8, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, and a protective glass E7. Among them, the first lens E1, the second lens E2, and the third lens E3 constitute a front lens group, and the fourth lens E4, the fifth lens E5, and the sixth lens E6 constitute a rear lens group.

The first lens element E1 is a meniscus lens element with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens element E2 is a meniscus lens element with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens element E3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The filter E8 has no optical power and its object side S8 and image side S9 may be planar. The fourth lens E4 is a biconcave lens with negative power, and has a concave object-side surface S10 and a concave image-side surface S11. The fifth lens element E5 is a biconvex lens with positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The sixth lens element E6 is a meniscus lens element with positive power, with the object side S13 being convex and the image side S14 being concave.

The fourth lens E4 and the fifth lens E5 may be cemented to constitute a cemented lens. The stop STO is disposed between the third lens E3 and the filter E8. Exemplarily, referring to fig. 7, the filter E8 includes a cut-off layer 81 and a light-transmissive substrate 82. Illustratively, the filter E8 may be other types of elements for filtering light.

Referring to fig. 8, the stop STO is used to limit marginal rays, and the maximum effective radius of the filter E8 is smaller than that of the adjacent lens.

Illustratively, the optical lens includes a cover glass E7 of no optical power, which includes an object side surface S15 and an image side surface S16. The protective glass E7 is used to protect the image sensing chip located at the imaging plane S17. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 1 shows a center radius of curvature R, a thickness T (it is understood that the thickness T of the row of S1 is the center thickness T1 of the first lens E1, the thickness T of the row of S2 is the air interval d12 between the first lens E1 and the second lens E2, and so on), a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

The value of the chief ray angle CRA at the cut-off layer 81 of this optical lens is 36.6 °, the value of the image height IMA is 6.24mm, the value of the maximum field angle FOV is 160.0 °, the value of the total optical length TTL is 17.2mm, and the value of the total effective focal length F is 2.28 mm.

In embodiment 1, the object-side surface S3 and the image-side surface S4 of the second lens element E2 and the object-side surface S10 of the fourth lens element E4 to the image-side surface S14 of the sixth lens element E6 may be aspheric, and the surface type x of each aspheric lens may be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The conic coefficient k and the high-order term coefficients a4, a6, A8, a10, and a12 that can be used for each aspherical mirror in example 1 are given in table 2 below.

TABLE 2

The optical lens provided by embodiment 1 has good imaging quality.

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 9. Fig. 9 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 9, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a filter E8, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, and a protective glass E7. The first lens E1, the second lens E2 and the third lens E3 form a front lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a rear lens group, and the protective glass E7 is used for protecting the image sensing chip 20 at the imaging surface S17. The lens group of this embodiment may be the lens group in embodiment 1.

The optical lens provided by the present embodiment further includes a lens barrel 13 and a bearing member 12. The bearing part 12 comprises a diaphragm STO, and the optical filter E8 is arranged in a mounting groove at the image side of the diaphragm STO. The first lens E1 to the sixth lens E6 are all provided in the lens barrel 13. The protective glass E7 and the image sensing chip 20 may be disposed outside the lens barrel 13.

Specifically, the first pressing ring 11 is screwed with the lens barrel 13, and presses the first lens E1 and the second lens E2. And the third lens E3, the bearing member 12, the fourth lens E4, the spacer 14, and the sixth lens E6 are arranged in this order and pressed by the second pressing ring 15. And the fifth lens E5 is cemented with the fourth lens E4, the outer diameter of the fifth lens E5 may be smaller than the inner diameter of the spacer 14.

The optical lens provided by the embodiment has the advantages of compact structure, higher strength after assembly and better imaging effect. The filter E8 is thin and the bearing member 13 can be used to increase the strength of the filter E8. Furthermore, the diaphragm STO is designed integrally with the bearing member 13 and can have a very close distance to the filter E8. On the one hand, the miniaturization of the optical lens is facilitated, and on the other hand, the field size is maintained and the imaging quality is improved.

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 10. Fig. 10 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 10, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a filter E8, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, and a protective glass E7. The first lens E1 constitutes a front lens group, and the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 constitute a rear lens group.

The first lens element E1 is a meniscus lens element with negative power, with the object side S1 being convex and the image side S2 being concave. The filter E8 has no optical power and its object side S4 and image side S5 may be planar. The second lens E2 is a biconcave lens with negative power, and has a concave object-side surface S6 and a concave image-side surface S7. The third lens element E3 is a biconvex lens with positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fourth lens element E4 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The fifth lens E5 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The sixth lens element E6 is a meniscus lens element with negative power, with the object side S12 being convex and the image side S13 being concave.

The stop STO is disposed between the first lens E1 and the filter E8. The second lens E2 and the third lens E3 may be cemented into a cemented lens, and the fifth lens E5 and the sixth lens E6 may also be cemented into a cemented lens. The light filter E8 may include a light-transmitting substrate and a cut-off layer disposed on an object side or an image side of the light-transmitting substrate.

Illustratively, the protective glass E7 has no optical power, and includes an object side surface S14 and an image side surface S15 for protecting the image sensing chip 20 at the imaging surface S16. The light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging surface S16.

The value of the chief ray angle CRA at the cut-off layer of the optical lens is 16.5 °, the value of the image height IMA is 9.0mm, the value of the maximum field angle FOV is 31.2 °, the value of the total optical length TTL is 44.0mm, and the value of the total effective focal length F is 16.4 mm.

Table 3 shows the central radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3. Table 4 shows the conic coefficient k and the high-order term coefficients a4, a6, A8, a10, and a12 which can be used for each aspherical mirror in example 3.

TABLE 3

TABLE 4

The optical lens provided by embodiment 3 has good imaging quality.

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 11. Fig. 11 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 11, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a filter E8, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, and a protective glass E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 form a front lens group, and the fifth lens E5, the sixth lens E6 and the seventh lens E7 form a rear lens group.

The first lens element E1 is a meniscus lens element with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens element E2 is a meniscus lens element with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens E3 is a meniscus lens with positive power, with the object side S5 being concave and the image side S6 being convex. The fourth lens element E4 is a biconvex lens with positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The filter E8 has no optical power and its object side S9 and image side S10 may be planar. The fifth lens element E5 is a meniscus lens element with negative power, with the object side S11 being convex and the image side S12 being concave. The sixth lens element E6 is a biconvex lens with positive refractive power, and has a convex object-side surface S12 and a convex image-side surface S13. The seventh lens E7 is a meniscus lens with positive power, with the object side S14 being convex and the image side S15 being concave.

The stop STO is disposed between the fourth lens E4 and the filter E8. The fifth lens E5 and the sixth lens E6 may be cemented into a cemented lens.

The light filter E8 may include a light-transmitting substrate and a cut-off layer disposed on an object side or an image side of the light-transmitting substrate. The object-side surface S14 and the image-side surface S15 of the seventh lens E7 each have an inflection point.

Illustratively, the protective glass E9 has no optical power, and includes an object side surface S16 and an image side surface S17 for protecting the image sensing chip 20 at the imaging surface S18. The light from the object sequentially passes through the respective surfaces S1 to S17 and is finally imaged on the imaging surface S18.

The value of the chief ray angle CRA at the cut-off layer of the optical lens is 19.0 °, the value of the image height IMA is 13.3mm, the value of the maximum field angle FOV is 80.0 °, the value of the total optical length TTL is 78.0mm, and the value of the total effective focal length F is 10.8 mm.

Table 5 shows the central radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4. Table 6 shows the conic coefficient k and the high-order term coefficients a4, a6, A8, a10, and a12 which can be used for each aspherical mirror in example 4.

TABLE 5

Flour mark

k

A4

A6

A8

A10

A12

S3

0.3884

3.7137E-05

-1.7109E-06

1.0417E-08

-1.0620E-11

-3.5708E-14

S4

-0.0300

6.6738E-05

-3.5816E-06

-5.7127E-09

2.1129E-10

-1.0992E-12

S5

-2.8404

-8.5885E-05

-1.2448E-07

-4.2328E-09

-3.6815E-11

6.7198E-13

S6

-3.5462

-3.4883E-05

-1.2163E-07

1.4873E-09

-7.2510E-12

2.0302E-14

S7

-2.8715

1.4572E-04

-5.9234E-07

6.6790E-09

-1.5171E-11

1.2929E-13

S8

-17.6078

2.8359E-05

1.3606E-06

-3.7829E-08

1.0364E-09

-9.3489E-12

S15

222.7882

-2.6511E-04

-7.4773E-07

3.4415E-09

-7.9982E-11

2.7361E-12

S16

38.9640

-1.0716E-03

-1.7119E-06

3.0826E-08

-2.0153E-10

8.2117E-13

TABLE 6

The optical lens provided by embodiment 4 has good imaging quality.

In an exemplary embodiment, the optical lens further includes a lens barrel 13. The lens barrel 13 includes an inner cavity penetrating along the optical axis, and a stopper is fixedly disposed at an image side end of the inner cavity.

The seventh lens E7 is mounted in the inner cavity and has an outer diameter larger than the inner diameter of the stopper, and the seventh lens E7 abuts against the object side surface of the stopper. Further, the first spacer 16, the fifth lens E5, the support member 15, the fourth lens E4, the second spacer 14, the third lens E3, the second lens E2, the third spacer 12, and the first lens E1 are sequentially disposed along the image side to the object side of the optical axis and are abutted against fixed positions. The pressing ring 11 is screwed with the lens barrel 13 and is pressed on the object side of the first lens E1.

The sixth lens E6 is glued with the fifth lens E5, and the filter E8 is arranged in the mounting groove of the bearing component 15. The bearing part comprises a diaphragm hole STO which is positioned on the object side of the mounting groove and penetrates through the mounting groove. The filter E8 is located approximately in the middle of both the object side surface S1 and the image plane S18 of the first lens E1.

The optical lens has good imaging quality, and is convenient for controlling the maximum light-passing aperture of the object side surface of the optical filter E8.

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 12. Fig. 12 is a schematic structural diagram showing an optical lens according to embodiment 5 of the present application.

As shown in fig. 12, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a filter E8, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, and a protective glass E7. Among them, the first lens E1, the second lens E2, and the third lens E3 constitute a front lens group, and the fourth lens E4, the fifth lens E5, and the sixth lens E6 constitute a rear lens group.

The first lens element E1 is a meniscus lens element with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens E2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The filter E8 includes a double-convex lens E82 having positive optical power and a cut-off layer E81 provided on an object-side surface S7 of the double-convex lens E82, and the object-side surface S7 of the double-convex lens E82 is convex and the image-side surface S8 is convex. The fourth lens element E4 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The fifth lens E5 is a biconcave lens with negative power, and has a concave object-side surface S10 and a concave image-side surface S11. The sixth lens element E6 is a biconvex lens with positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12.

The stop STO is disposed between the third lens E3 and the filter E8. The second lens E2 and the third lens E3 may be cemented into a cemented lens. The fourth lens E4, the fifth lens E5, and the sixth lens E6 may be cemented into a cemented lens.

Illustratively, the protective glass E7 has no optical power, and includes an object side surface S13 and an image side surface S14 for protecting the image sensing chip located at the imaging surface S15. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

The value of the chief ray angle CRA at the cut-off layer of the optical lens is 19.68 °, the value of the image height IMA is 9.76mm, the value of the maximum field angle FOV is 80.0 °, the value of the total optical length TTL is 30.0mm, and the value of the total effective focal length F is 7.247 mm.

Table 7 shows the central radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5. Table 8 shows the conic coefficient k and the high-order term coefficients a4, a6, A8, a10, and a12 which can be used for each aspherical mirror in example 5.

TABLE 7

Flour mark

k

A4

A6

A8

A10

A12

S1

-3.4205

-1.9543E-03

9.1771E-05

-2.7163E-06

5.4066E-08

-5.7267E-10

S2

-2.4597

1.3421E-03

1.2515E-05

-1.4363E-07

2.3140E-07

-6.5723E-09

S12

12.8050

2.8635E-04

6.8529E-05

-3.0503E-06

1.6977E-07

-3.4683E-09

TABLE 8

The optical lens provided by embodiment 5 has good imaging quality.

In summary, examples 1, 3, 4 and 5 can satisfy the relationship shown in table 9 below.

Conditional expression (A) example	Example 1	Example 3	Example 4	Example 5
					FOV/CRA	4.3716	1.8909	4.2105	4.0650
D/IMA	0.5128	1.5111	0.8571	1.0041
					CRA/IMA	5.8654	1.8333	1.4286	2.0164
TTL/F	7.5439	2.6829	7.2222	4.1396
					TTL/IMA/FOV	0.0172	0.1567	0.0733	0.0384
BFL/TTL	0.1779	0.2043	0.0851	0.2567

TABLE 9

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 13. Fig. 13 is a schematic structural diagram showing an optical lens according to embodiment 6 of the present application.

As shown in fig. 13, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a filter element E8, a fourth lens element E4, a fifth lens element E5, and a protective glass E6.

The first lens E1 is a meniscus lens having a negative power, which is curved toward the object side. The second lens E2 is a biconcave lens having a negative optical power. The third lens E3 is a double-convex lens having a positive optical power. The filter E8 is a biconvex lens with positive optical power, and the material of the filter E8 is, for example, colored glass. The fourth lens E4 is a double-convex lens having a positive optical power. The fifth lens E5 is a double-convex lens having a positive optical power.

The second lens E2 and the third lens E3 may be cemented to constitute a cemented lens. The stop STO is disposed between the third lens E3 and the filter E8. Illustratively, the optical lens may further include a cover glass E6 having no optical power. The protective glass E6 is used to protect the image sensing chip located at the imaging plane. The light from the object passes through the respective optical elements E1 to E6 in sequence and is finally imaged on the imaging plane. The optical lens has compact structure and good imaging quality.

The present application also provides an electronic device that may include the optical lens according to the above-described embodiments of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. Illustratively, the electronic device includes an imaging element disposed on an imaging surface of the optical lens. Alternatively, the imaging element provided on the imaging plane may be a photo-coupled device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).

The electronic device may be a stand-alone electronic device such as a range finding camera or may be an imaging module integrated on a device such as a range finding device. Furthermore, the electronic device may also be a stand-alone imaging device such as a vehicle-mounted camera, or may be an imaging module integrated on a driving assistance system such as a car.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (23)

1. The optical lens assembly, in order from an object side to an image side along an optical axis, comprises:

a front lens group;

the optical filter comprises a cut-off layer, the cut-off layer is used for filtering imaging light transmitted by the front lens group, and the maximum light-passing aperture D of the object side surface of the optical filter and the image height IMA corresponding to the maximum field angle on the imaging surface of the optical lens meet the following conditions: D/IMA is more than or equal to 0.3 and less than or equal to 1.8; and

a rear lens group.

2. An optical lens according to claim 1, characterized in that the filter is constituted by an integral cut-off layer.

3. An optical lens according to claim 2, characterized in that the cut-off layer has optical power.

4. An optical lens according to claim 2, characterized in that the cut-off layer has no optical power.

5. An optical lens according to claim 1, characterized in that the filter further comprises a light-transmissive substrate for carrying the cut-off layer.

6. An optical lens according to claim 5, characterized in that the light-transmitting substrate has optical power.

7. The optical lens barrel according to claim 6, wherein the front lens group includes a first lens, a second lens, and a third lens arranged in order from an object side to an image side along the optical axis;

wherein the first lens has a negative optical power; the second lens has a negative optical power; the third lens has positive optical power; the light-transmissive substrate has positive optical power.

8. An optical lens according to claim 5, characterized in that the light-transmitting substrate is a flat glass.

9. The optical lens barrel according to claim 8, wherein the front lens group includes a first lens, a second lens, and a third lens arranged in order from an object side to an image side along the optical axis;

the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from the object side to the image side along the optical axis;

the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;

the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface while the image side surface of the sixth lens is a concave surface.

10. An optical lens according to claim 8, wherein the front lens group comprises a first lens, and the rear lens group comprises a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along the optical axis;

the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, and the sixth lens has a negative optical power;

the second lens and the third lens constitute a first cemented lens, and the fifth lens and the sixth lens constitute a second cemented lens.

11. The optical lens barrel according to claim 8, wherein the front lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side to an image side along the optical axis;

the rear lens group comprises a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from the object side to the image side along the optical axis;

the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has a negative optical power, the sixth lens has a positive optical power, and the seventh lens has a negative optical power;

the object side surface of the seventh lens and the image side surface of the seventh lens are respectively provided with an inflection point.

12. An optical lens according to claim 1, wherein the cut-off layer is an infrared cut-off film, an infrared band-pass film, or a visible-light infrared double-pass film.

13. An optical lens according to claim 12, wherein the cut-off layer has a pass interval with a transmittance greater than 50%, the pass interval comprising a high-transmittance interval with an average transmittance greater than 90%.

14. An optical lens as claimed in any one of claims 1 to 13, characterized in that a chief ray angle CRA of the maximum field of view at the cut-off layer and an image height IMA on an imaging plane of the optical lens corresponding to a maximum field angle satisfy:

1≤CRA/IMA≤8。

15. an optical lens according to any one of claims 1 to 13, wherein the total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy:

TTL/F≤10。

16. an optical lens as claimed in any one of claims 1 to 13, characterized in that a Chief Ray Angle (CRA) of a maximum field of view at the cut-off layer and a maximum field angle (FOV) of the optical lens satisfy 1 ≦ FOV/CRA ≦ 7.

17. The optical lens according to any one of claims 1 to 13, wherein a total optical length TTL of the optical lens, a maximum field angle FOV of the optical lens, and an image height IMA on an imaging plane of the optical lens corresponding to the maximum field angle satisfy:

TTL/IMA/FOV≤0.2。

18. an optical lens according to any one of claims 1 to 13, characterized in that the back focus BFL of the optical lens and the total optical length TTL of the optical lens satisfy:

BFL/TTL≤0.35。

19. an optical lens according to any one of claims 1 to 13, characterized in that a chief ray angle CRA of the maximum field of view at the cut-off layer satisfies:

CRA≤40。

20. an optical lens barrel according to any one of claims 1 to 13, further comprising a stop disposed between the filter and the front lens group.

21. An optical lens according to any one of claims 1 to 13, further comprising a lens barrel having a mounting cavity;

the front lens group, the rear lens group and elements arranged on the optical axis between the front lens group and the rear lens group are all arranged in the mounting cavity.

22. An optical lens as recited in claim 21, further comprising a bearing member disposed in the mounting cavity;

the bearing part comprises a diaphragm hole penetrating along the optical axis direction and a mounting groove arranged on the image side of the diaphragm hole, and the mounting groove is used for mounting the optical filtering piece.

23. An electronic apparatus, characterized by comprising the optical lens according to any one of claims 1 to 22 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images