Imaging lens system

Abstract

A camera lens system includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged sequentially from the object side; and an aperture stop, disposed on the image side of one of the first to sixth lenses, wherein one or more of the second to seventh lenses disposed on the image side of the aperture stop each has a positive refractive power and a negative temperature coefficient of refractive index.

Description

Technical Field

[0001] The following description relates to an imaging lens system that can implement constant optical performance regardless of changes in ambient temperature. Prior Art

[0002] The small surveillance camera is configured to obtain image information from the surveillance area. For example, the small surveillance camera can be installed on the front bumper and the rear bumper of the vehicle and can provide the obtained image to the driver.

[0003] Since early models of small surveillance cameras are configured to photograph obstacles near the vehicle, they have relatively low resolution, and the resolution may vary depending on the temperature change between -40° C. and 80° C. Recently, vehicles are required to have a self-driving function, and there has been a demand for surveillance cameras with high resolution and constant optical properties that can be implemented under harsh temperature conditions. Summary of the invention

[0004] This summary is provided to introduce a series of concepts that are further described in the detailed description below in a simplified form. This summary is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0005] A camera lens system that can implement constant optical properties regardless of ambient temperature.

[0006] In a general aspect, an imaging lens system includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in order from the object side; and an aperture, which is arranged on the image side of one of the first lens to the sixth lens, and one or more of the second lens to the seventh lens arranged on the image side of the aperture each has a positive refractive power and a negative refractive index temperature coefficient.

[0007] The aperture stop may be disposed between the third lens and the fourth lens.

[0008] The fourth lens or the sixth lens may have positive refractive power.

[0009] The fourth lens or the sixth lens may have a negative temperature coefficient of refractive index.

[0010] A refractive index temperature coefficient of the fourth lens or the sixth lens may be greater than -10*10 -6 / °C and less than -0.5*10 -6 / °C.

[0011] The second lens may have a concave object-side surface.

[0012] The sixth lens may have a convex image-side surface.

[0013] The seventh lens may have negative refractive power.

[0014] The seventh lens may have a concave object-side surface.

[0015] In another general aspect, an imaging lens system includes: a first lens group disposed on an object-side surface of an aperture; and a second lens group disposed between the aperture and the image-side surface. A sum DTnT of a refractive index temperature coefficient of a lens included in the first lens group and a refractive index temperature coefficient of a lens included in the second lens group is -3.5 [10 -6 / °C] or greater and 3.5 [10 -6 / °C] or less.

[0016] A sum DTnF of refractive index temperature coefficients of the lenses included in the first lens group may be 5.0 [10 -6 / ° C.] or more and 15 [10 -6 / ° C.] or less.

[0017] The sum DTnR of refractive index temperature coefficients of the lenses included in the second lens group may be -20 [10 -6 / ° C.] or more and -8.0 [10 -6 / ° C.] or less.

[0018] A sum DTnF of the refractive index temperature coefficients of the lenses included in the first lens group and a sum DTnR of the refractive index temperature coefficients of the lenses included in the second lens group may satisfy 0.8 ≤ |DTnF / DTnR| ≤ 1.2.

[0019] Among the lenses included in the first lens group, a lens most adjacent to the aperture stop may have a positive refractive power.

[0020] Among the lenses included in the second lens group, a lens most adjacent to the aperture stop may have a positive refractive power.

[0021] Among the lenses included in the second lens group, a lens most adjacent to the image-side surface may have a negative refractive power.

[0022] In another general aspect, a camera lens system includes: an aperture; a first lens group disposed on the object side of the aperture and including two or more lenses, the two or more lenses of the first lens group each having a positive refractive index temperature coefficient; and a second lens group disposed between the image side of the aperture and an image sensor and including two or more lenses, the two or more lenses of the second lens group each having a negative refractive index temperature coefficient.

[0023] The first lens group may include three lenses, and the second lens group may include four lenses.

[0024] A lens of the second lens group disposed most adjacent to the aperture stop may have a positive temperature coefficient of refractive index.

[0025] At least two of the lenses of the first lens group may each have a negative refractive power, and at least two of the lenses of the second lens group may each have a negative refractive power.

[0026] Other features and aspects will become apparent from a review of the following detailed description, drawings, and claims. Simple diagram description

[0027] FIG. 1 is a diagram showing a first example of an imaging lens system. FIG. 2 shows aberration curves of the image pickup lens system shown in FIG. 1 . FIG. 3 shows a modulation transfer function (MTF) curve of the imaging lens system shown in FIG. 1 . FIG. 4 shows a graph showing changes in back focal length (BFL) of the imaging lens system shown in FIG. 1 as a function of temperature. FIG. 5 is a diagram showing a second example of the imaging lens system. FIG. 6 shows aberration curves of the image pickup lens system shown in FIG. 5 . FIG. 7 shows an MTF curve of the image pickup lens system shown in FIG. 5 . FIG. 8 shows a graph representing the change in back focus (BFL) of the imaging lens system shown in FIG. 5 as a function of temperature. FIG. 9 is a diagram showing a third example of the imaging lens system. FIG. 10 shows aberration curves of the image pickup lens system shown in FIG. 9 . FIG. 11 shows an MTF curve of the image pickup lens system shown in FIG. 9 . FIG. 12 shows a graph representing the change in back focus (BFL) of the imaging lens system shown in FIG. 9 as a function of temperature. FIG. 13 is a diagram showing a fourth example of the imaging lens system. FIG. 14 shows aberration curves of the image pickup lens system shown in FIG. 13 . FIG. 15 shows an MTF curve of the image pickup lens system shown in FIG. 13 . FIG. 16 shows a graph representing the change in back focus (BFL) of the imaging lens system shown in FIG. 13 as the temperature changes. FIG. 17 is a diagram showing a fifth example of the imaging lens system. FIG. 18 shows aberration curves of the image pickup lens system shown in FIG. 17 . FIG. 19 shows an MTF curve of the image pickup lens system shown in FIG. 17 . FIG. 20 shows a graph representing the change in back focus (BFL) of the imaging lens system shown in FIG. 17 as a function of temperature. FIG. 21 is a diagram showing a sixth example of the imaging lens system. FIG. 22 shows aberration curves of the image pickup lens system shown in FIG. 21 . FIG. 23 shows an MTF curve of the image pickup lens system shown in FIG. 21 . FIG. 24 shows a graph representing the change in back focus (BFL) of the imaging lens system shown in FIG. 17 as a function of temperature. In all drawings and throughout the detailed description, the same reference numerals refer to the same elements. The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of the elements in the drawings may be exaggerated for clarity, illustration, and convenience. Implementation

[0028] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent to those having ordinary knowledge in the art. The order of operations described herein is merely an example and is not intended to be limited to the order of operations described herein, but as will be apparent to those having ordinary knowledge in the art, operations other than those that must be performed in a particular order may also be varied. In addition, for clarity and brevity, descriptions of functions and configurations that would be well known to those having ordinary knowledge in the art may be omitted.

[0029] The features described herein may be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those having ordinary knowledge in the art.

[0030] Note that herein, use of the term "may" with respect to an example or embodiment (e.g., with respect to what an example or embodiment may include or implement) means that there is at least one example or embodiment that includes or implements such feature, and all examples and embodiments are not limited thereto.

[0031] Throughout the specification, when an element such as a layer, a region or a substrate is described as being "on", "connected to" or "coupled to" another element, the element may be directly "on", "connected to" or "coupled to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on", "directly connected to" or "directly coupled to" another element, there may be no other elements in between.

[0032] As used herein, the term “and / or” includes any one of the relevant listed items or any combination of any two or more of the relevant listed items.

[0033] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Specifically, these terms are only used to distinguish between various components, elements, regions, layers, or sections. Therefore, without departing from the teaching content of the examples, the first component, component, region, layer, or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer, or section.

[0034] For ease of description, spatially relative terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element shown in a figure relative to another element. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, an element described as being "above" or "upper" relative to another element would now be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0035] The terms used herein are only for the purpose of illustrating various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include the plural forms as well. The terms "comprises", "includes" and "has" specify the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0036] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacturing.

[0037] As will be apparent after understanding the disclosure of the present application, the features of the examples described herein can be combined in various ways. In addition, as will be apparent after understanding the disclosure of the present application, although the examples described herein have multiple configurations, other configurations may exist.

[0038] In the example, the first lens refers to the lens closest to the object, and the seventh lens refers to the lens closest to the image side surface (or image sensor). In the example, the unit of the radius of curvature, thickness, the distance from the object side surface to the image side surface (TTL) of the first lens, half the diagonal length of the image side surface (IMG HT), and focal length is expressed in millimeters (mm).

[0039] The thickness of the lens, the gap between the lenses, and the TTL refer to the distance of the lenses in the optical axis direction. In addition, in the description of the shape of the lens, a configuration in which one surface is convex indicates that the paraxial region of the surface is convex, and a configuration in which one surface is concave indicates that the paraxial region of the surface is concave. Therefore, even when one surface of the lens is described as convex, the edge of the lens may be concave. Similarly, even when one surface of the lens is described as concave, the edge of the lens may be convex.

[0040] The imaging lens system includes seven lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side surface. The first lens to the seventh lens may be arranged to have a certain gap between each of the adjacent lenses. For example, the image side surface and the object side surface of the adjacent lenses may not contact each other in the paraxial region. Therefore, even when the image side surface of the lens on one side and the object side surface of the lens on the other surface are shown to contact each other in the figure, the image side surface and the object side surface do not contact each other between the two lenses.

[0041] The first lens has a refractive power. For example, the first lens has a negative refractive power. A surface of the first lens may be convex. For example, an object-side surface of the first lens may be convex.

[0042] The first lens includes a spherical surface. For example, both surfaces of the first lens may be spherical. The first lens may be made of a material having high light transmittance and excellent workability. For example, the first lens may be made of a glass or plastic material. The first lens has a high refractive index. For example, the refractive index of the first lens may be 1.7 or greater. As another example, the refractive index of the first lens may be 1.7 or greater and 1.8 or less.

[0043] The second lens has a refractive power. For example, the second lens may have a negative refractive power. One surface of the second lens may be concave. For example, an object-side surface or an image-side surface of the second lens may be concave.

[0044] The second lens may include a spherical surface. For example, both surfaces of the second lens may be spherical. The second lens may be made of a material having high light transmittance and excellent processability. For example, the second lens may be made of a glass or plastic material. The second lens may have a refractive index greater than that of the first lens. For example, the refractive index of the second lens may be 1.8 or greater. As another example, the refractive index of the second lens may be 1.8 or greater and less than 2.0.

[0045] The third lens may have refractive power. For example, the third lens may have positive refractive power. One surface of the third lens may be convex. For example, the object-side surface of the third lens may be convex.

[0046] The third lens may include a spherical shape. For example, both surfaces of the third lens may be spherical. The third lens may be made of a material having high light transmittance and excellent processability. For example, the third lens may be made of a glass or plastic material. The third lens may have a refractive index similar to that of the second lens. For example, the refractive index of the third lens may be 1.8 or greater. As another example, the refractive index of the third lens may be 1.8 or greater and less than 2.0.

[0047] The fourth lens may have refractive power. For example, the fourth lens may have positive refractive power. One surface of the fourth lens may be convex. For example, the object-side surface of the fourth lens may be convex.

[0048] The fourth lens may include an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material having high light transmittance and excellent processability. For example, the fourth lens may be made of a glass or plastic material. Among the first to seventh lenses, the fourth lens may have the lowest refractive index. As an example, the refractive index of the fourth lens may be less than 1.6. As another example, the refractive index of the fourth lens may be 1.2 or greater than 1.2 and less than 1.6.

[0049] The fifth lens may have refractive power. The fifth lens may have negative refractive power. One surface of the fifth lens may be concave. For example, the object-side surface of the fifth lens may be concave.

[0050] The fifth lens may include a spherical shape. For example, both surfaces of the fifth lens may be spherical. The fifth lens may be made of a material having high light transmittance and excellent processability. For example, the fifth lens may be made of a glass or plastic material. The fifth lens may have a refractive index similar to that of the third lens. For example, the refractive index of the fifth lens may be 1.8 or greater. As another example, the refractive index of the fifth lens may be 1.8 or greater and less than 2.0.

[0051] The sixth lens may have refractive power. For example, the sixth lens may have positive refractive power. One surface of the sixth lens may be convex. For example, the image side surface of the sixth lens may be convex.

[0052] The sixth lens may include a spherical surface. For example, both surfaces of the sixth lens may be spherical. The sixth lens may be made of a material having high light transmittance and excellent processability. For example, the sixth lens may be made of a glass or plastic material. The sixth lens may have a refractive index similar to that of the fourth lens. For example, the refractive index of the sixth lens may be 1.5 or greater than 1.5 and less than 1.7.

[0053] The seventh lens may have refractive power. For example, the seventh lens may have negative refractive power. At least one surface of the seventh lens may be concave. For example, the object-side surface of the seventh lens may be concave.

[0054] The seventh lens may include an aspherical shape. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may be made of a material having high light transmittance and excellent processability. For example, the seventh lens may be made of a glass or plastic material. The seventh lens may have a refractive index similar to that of the first lens. For example, the refractive index of the seventh lens may be 1.7 or greater. As another example, the refractive index of the seventh lens may be 1.7 or greater and less than 1.9.

[0055] The fourth lens and the seventh lens may include aspherical surfaces as described above. The aspherical surfaces of the fourth lens and the seventh lens may be represented by the following Equation 1. Equation 1:

[0056] In Equation 1, "c" is the inverse of the radius of curvature of the corresponding lens, "k" is the cone constant, "r" is the distance from a point on the aspheric surface of the lens to the optical axis, "A", "B", "C" and "D" are aspheric constants, and "Z" (or SAG) is the height from a point on the aspheric surface of the lens to the vertex of the aspheric surface obtained in the direction of the optical axis.

[0057] The imaging lens system may include a filter, an image sensor, and an aperture. The imaging lens system may further include a cover glass.

[0058] The filter may be disposed between the seventh lens and the image sensor. The filter may block light having a specific wavelength. For example, the filter may block light having an infrared wavelength. The image sensor may form an image side surface. The aperture may be configured to adjust the amount of light incident on the lens. For example, the aperture may be disposed between the third lens and the fourth lens. The cover glass may be disposed between the filter and the image sensor, and may prevent contamination and damage to the image sensor caused by foreign matter.

[0059] Each of the first to seventh lenses may have a certain refractive index temperature coefficient (10 -6 / °C). The refractive index temperature coefficients (DTn) of the lenses may be distinguished from each other by a stop disposed between the lenses. As an example, most of the lenses disposed on the object-side surface of the stop (first lens group) may have a positive refractive index temperature coefficient, and most of the lenses disposed between the stop and the image-side surface (second lens group) may have a negative refractive index temperature coefficient. However, not all lenses included in the second lens group may have a negative refractive index temperature coefficient. As an example, among the lenses included in the second lens group, the lens disposed most adjacent to the object-side surface may have a positive refractive index temperature coefficient.

[0060] The lens having positive refractive power among the lenses included in the second lens group may have a negative refractive index temperature coefficient. For example, the fourth lens or the sixth lens among the lenses included in the second lens group may have positive refractive power and may have a negative refractive index temperature coefficient.

[0061] The lenses included in each of the lens groups may have specific refractive power in a specific position. As an example, among the lenses included in the first lens group, the lens most adjacent to the stop may have a positive refractive power. As another example, among the lenses included in the second lens group, the lens most adjacent to the stop may have a positive refractive power. As another example, among the lenses included in the second lens group, the lens most adjacent to the image-side surface may have a negative refractive power.

[0062] The lens included in the imaging lens system may satisfy one or more of the following conditional equations regarding a temperature coefficient of refractive index (hereinafter referred to as “DTn”). Conditional equation 1: -3.5 ≤ DTnT ≤ 3.5 [10 -6 / ℃] Conditional equation 2: 5.0 ≤ DTnF ≤ 15 [10 -6 / ℃] Conditional equation 3: -20 ≤ DTnR ≤ -8.0 [10 -6 / ℃] Conditional equation 4: 0.8 ≤ |DTnF / DTnR| ≤ 1.2 [10 -6 / ℃]

[0063] In conditional equations 1-4, "DTnT" is the sum of DTn of the lenses included in the imaging lens system, "DTnF" is the sum of DTn of the lenses (first lens group) arranged on the object side of the aperture, and "DTnR" is the sum of DTn of the lenses (second lens group) arranged between the aperture and the image side.

[0064] The DTn of the lenses included in the second lens group may have a certain range. As an example, the refractive index temperature coefficient (DTn4) of the fourth lens or the refractive index temperature coefficient (DTn6) of the sixth lens may be greater than -10*10 -6 / °C and less than -0.5*10 -6 / °C.

[0065] The lenses included in the imaging lens system may have a certain constant of thermal expansion (CTE) (10 -6 / °C). For example, the thermal expansion constant (CTE) of the first to seventh lenses may be 2.0 [10 -6 / °C] or greater and 20 [10 -6 / °C] or less. At least one of the lenses included in the imaging lens system may have a thermal expansion constant different from the thermal expansion constants of the other lenses. As an example, the thermal expansion constant (CTE6) of the sixth lens may be greater than the thermal expansion constants (CTE1, CTE2, CTE3, CTE4, CTE5, and CTE7) of the other lenses. As another example, the thermal expansion constant (CTE7) of the seventh lens may be less than the thermal expansion constant (CTE6) of the sixth lens.

[0066] The difference (CTE6-CTE7) between the thermal expansion constant (CTE6) of the sixth lens and the thermal expansion constant (CTE7) of the seventh lens may be 1.0 [10-6 / °C] or more and 5.0 [10-6 / °C] or less.

[0067] Each of the lenses included in the imaging lens system may have a focal length temperature coefficient (VT) that changes with temperature. The focal length temperature coefficient (VT) of each of the lenses may be obtained by the following equation. VTi = [DTni / (Ndi-1)-CTEi]-1

[0068] In the equation, "VTi" is the focal length temperature coefficient of the i-th lens, "DTni" is the refractive index temperature coefficient of the i-th lens, "Ndi" is the refractive index of the i-th lens, and "CTEi" is the thermal expansion constant of the i-th lens.

[0069] The focal length temperature coefficient obtained from the above equation can satisfy the following conditional equation. Conditional equation 5: VT5 < VT4 Conditional equation 6: |1 / (f5*VT5)| < |1 / (f4*VT4)| Conditional equation 7: 1 / (F4*VT4) + 1 / (F6*VT6) < -2 / (F5*VT5)

[0070] In conditional equations 5-7, "f4" is the focal length of the fourth lens, "f5" is the focal length of the fifth lens, "f6" is the focal length of the sixth lens, "VT4" is the focal length temperature coefficient of the fourth lens, "VT5" is the focal length temperature coefficient of the fifth lens, and "VT6" is the focal length temperature coefficient of the sixth lens.

[0071] Each of the lenses included in the imaging lens system may have a negative focal temperature coefficient. The negative focal temperature coefficient may be represented by the following conditional equation. Condition Equation 8: VTi < 0

[0072] The focal temperature coefficient of the lenses disposed with the aperture stop interposed therebetween in the imaging lens system may satisfy the following conditional equation. Conditional equation 9:100 < VTS1-VTS2 < 400[10 -6 / ℃]

[0073] In conditional equation 9, "VTS1" is the focal temperature coefficient of the lens disposed most adjacent to the object side of the stop, and "VTS2" is the focal temperature coefficient of the lens disposed most adjacent to the image side of the stop.

[0074] In the imaging lens system, the focal temperature coefficient of the lens adjacent to the image side surface may satisfy the following conditional equation. Conditional equation 10: 300 < VTM2-VTM1 < 900 [10 -6 / ℃]

[0075] In the imaging lens system, the focal temperature coefficient between the lenses adjacent to the image side surface may be greater than the focal temperature coefficient of the lenses adjacent to the object. The configuration may be expressed by the following conditional equation. Conditional equation 11: 0 < (VTO1-VTO2) / (VTM1-VTM2) < 1.0

[0076] In conditional equations 10 and 11, "VTO1" is the focal temperature coefficient of the lens disposed closest to the object, "VTO2" is the focal temperature coefficient of the lens disposed second closest to the object, "VTM1" is the focal temperature coefficient of the lens disposed closest to the image side surface, and "VTM2" is the focal temperature coefficient of the lens disposed second closest to the object side surface.

[0077] The imaging lens system may satisfy one of the following conditional equations. Conditional equation 12:30 < V4 - V5 Conditional equation 13: |f4| < 2*f Conditional equation 14: |f5| < 2*f

[0078] In conditional equations 12-14, "V4" is the Abbe number of the fourth lens, "V5" is the Abbe number of the fifth lens, and "f" is the focal length of the imaging lens system.

[0079] In the following description, an imaging lens system will be described according to one or more examples.

[0080] A first example of an imaging lens system will be described with reference to FIG. 1 .

[0081] The camera lens system 100 may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , a sixth lens 160 , and a seventh lens 170 .

[0082] The first lens 110 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 120 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 130 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 140 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 150 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 160 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 170 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0083] The camera lens system 100 may further include a filter 182, a cover glass 184, an image sensor 190, and an aperture ST. The filter 182 and the cover glass 184 may be disposed between the seventh lens 170 and the image sensor 190. The aperture ST may be disposed between the third lens 130 and the fourth lens 140.

[0084] 2 and 3 show the aberration properties and MTF properties of the imaging lens system 100. FIG4 shows the amount of change in the back focus of the imaging lens system 100 as a function of temperature (ΔBFL: μm). As shown in FIG4 , the amount of change in the back focus of the imaging lens system is 2.2 μm at or below -40°C and 2.6 μm at or above 80°C, respectively, but is 1.5 μm or less in the range of -20°C to 60°C.

[0085] Tables 1 and 2 list the lens properties and aspherical surface values of the imaging lens system 100 .

[0086] Table 1 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 65.772 2.500 1.7725 49.62 3.60 8.00 -301.8 2 13.56 9.131 3 Second lens -25.204 6.049 1.8348 42.72 3.80 8.00 -284.2 4 -35.65 15.173 5 The third lens 62.362 4.599 1.8042 46.5 3.70 8.00 -292.8 6 -62.362 6.918 7 Aperture infinity 4.000 8 The fourth lens 19.35 6.496 1.4971 81.56 -6.80 8.00 -46.4 9 -34.344 3.768 10 Fifth lens -90.178 2.550 1.8081 22.76 -3.70 8.00 -79.5 11 18.264 4.535 12 The sixth lens 26.083 7.204 1.5928 68.62 -7.00 11.10 -43.7 13 -31.09 8.682 14 Seventh lens -45.976 3.050 1.7555 45.59 4.90 8.00 -658.8 15 -120 0.500 16 filter infinity 1.100 1.5168 64.17 17 infinity 0.500 18 Cover glass infinity 1.100 1.5168 64.17 19 infinity 3.388 20 Image side surface infinity 0.000

[0087] Table 2 Surface number K A B C D 8 -7.7205E-01 5.2940E-06 3.4185E-08 - - 9 -3.4660E+00 2.7021E-05 -3.4495E-08 - - 15 - -7.9572E-05 -2.2783E-07 -9.8448E-10 1.3392E-11 16 - -7.5011E-05 -3.6238E-07 1.9905E-09 5.4521E-13

[0088] A second example of the imaging lens system will be described with reference to FIG. 5 .

[0089] The camera lens system 200 may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , a sixth lens 260 , and a seventh lens 270 .

[0090] The first lens 210 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 220 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 230 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 240 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 250 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 260 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 270 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0091] The camera lens system 200 may further include a filter 282, a cover glass 284, an image sensor 290, and an aperture ST. The filter 282 and the cover glass 284 may be disposed between the seventh lens 270 and the image sensor 290. The aperture ST may be disposed between the third lens 230 and the fourth lens 240.

[0092] 6 and 7 show the aberration properties and MTF properties of the imaging lens system 200. FIG. 8 shows the amount of change (ΔBFL: micrometer) of the back focus of the imaging lens system 200 with temperature change. As shown in FIG. 8, the amount of change of the back focus of the imaging lens system is expected to be approximately 2.2 micrometers at or below -40°C and 2.8 micrometers at or above 80°C, respectively. However, by using the lens property (ΔLENS BACK) that the focal length can change with temperature change, the substantial amount of change (defocus) of the back focus of the imaging lens system 200 is reduced to ±0.5 micrometers even in the range of -40°C to 80°C.

[0093] Tables 3 and 4 list the lens properties and aspherical surface values of the imaging lens system 200 .

[0094] Table 3 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 62.561 2.518 1.773 49.62 3.60 8.00 -301.8 2 13.565 9.077 3 Second lens -27.214 5.900 1.835 42.72 3.80 8.00 -284.2 4 -42.497 15.027 5 The third lens 61.159 4.691 1.804 46.50 3.70 8.00 -292.8 6 -61.159 7.788 7 Aperture infinity 4.000 8 The fourth lens 19.140 6.496 1.497 81.56 -6.80 8.00 -46.4 9 -35.374 3.858 10 Fifth lens -96.821 2.550 1.808 22.76 -3.70 8.00 -79.5 11 18.101 4.458 12 The sixth lens 26.191 7.327 1.593 68.62 -7.00 11.10 -43.7 13 -29.622 8.772 14 Seventh lens -42.943 3.050 1.756 45.59 4.90 8.00 -658.8 15 -120.000 0.500 16 filter infinity 1.100 1.517 64.17 17 infinity 0.500 18 Cover glass infinity 1.100 1.517 64.17 19 infinity 3.388 20 Image side surface infinity 0.000

[0095] Table 4 Surface number K A B C D 8 -7.72E-01 5.01E-06 3.53E-08 - - 9 -3.47E+00 2.80E-05 -3.40E-08 - - 15 - -8.19E-05 -1.97E-07 -7.33E-10 1.23E-11 16 - -8.14E-05 -3.05E-07 1.95E-09 4.71E-13

[0096] A third example of the imaging lens system will be described with reference to FIG. 9 .

[0097] The camera lens system 300 may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , a sixth lens 360 , and a seventh lens 370 .

[0098] The first lens 310 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 320 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 330 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 340 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 350 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 360 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 370 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0099] The camera lens system 300 may further include a filter 382, a cover glass 384, an image sensor 390, and an aperture ST. The filter 382 and the cover glass 384 may be disposed between the seventh lens 370 and the image sensor 390. The aperture ST may be disposed between the third lens 330 and the fourth lens 340.

[0100] FIG. 10 and FIG. 11 show the aberration property and MTF property of the imaging lens system 300. FIG. 12 shows the amount of change (ΔBFL: micrometer) of the back focus of the imaging lens system 300 with temperature change. As shown in FIG. 12, the amount of change of the back focus of the imaging lens system is expected to be approximately 1.0 micrometer at or below -40°C and 4.6 micrometer at or above 80°C, respectively. However, by using the lens property (ΔLENS BACK) that the focal length can change with temperature change, the substantial amount of change (defocus) of the back focus of the imaging lens system 300 is reduced to ±2.0 micrometers even in the range of -40°C to 80°C.

[0101] Tables 5 and 6 list the lens properties and aspherical surface values of the imaging lens system 300 .

[0102] Table 5 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 24.328 2.598 1.773 49.62 3.60 8.00 -301.8 2 15.264 9.725 3 Second lens 500.000 2.500 1.835 42.72 3.80 8.00 -284.2 4 20.273 21.609 5 The third lens 49.060 4.691 1.804 46.50 3.70 8.00 -292.8 6 -85.802 10.081 7 Aperture infinity 6.266 8 The fourth lens 20.279 6.546 1.497 81.56 -6.80 8.00 -46.4 9 -36.788 4.915 10 Fifth lens -302.321 2.500 1.808 22.76 -3.70 8.00 -79.5 11 17.125 1.521 12 The sixth lens 22.180 6.392 1.593 68.62 -7.00 11.10 -43.7 13 -37.145 11.003 14 Seventh lens -53.514 3.050 1.756 45.59 4.90 8.00 -658.8 15 -120.000 0.500 16 filter infinity 1.100 1.517 64.17 17 infinity 0.500 18 Cover glass infinity 1.100 1.517 64.17 19 infinity 3.390 20 Image side surface infinity 0.000

[0103] Table 6 Surface number K A B C D 8 -7.72E-01 3.51E-06 4.83E-08 - - 9 -3.47E+00 2.82E-05 -1.04E-08 - - 15 - 1.33E-05 -4.56E-07 2.63E-10 -4.37E-12 16 - 1.04E-05 -6.41E-07 1.66E-10 2.85E-12

[0104] A fourth example of the imaging lens system will be described with reference to FIG. 13 .

[0105] The camera lens system 400 may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , a sixth lens 460 , and a seventh lens 470 .

[0106] The first lens 410 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 420 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 430 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 440 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 450 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 460 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 470 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0107] The camera lens system 400 may further include a filter 482, a cover glass 484, an image sensor 490, and an aperture ST. The filter 482 and the cover glass 484 may be disposed between the seventh lens 470 and the image sensor 490. The aperture ST may be disposed between the third lens 430 and the fourth lens 440.

[0108] FIG. 14 and FIG. 15 show the aberration property and MTF property of the imaging lens system 400. FIG. 16 shows the amount of change (ΔBFL: micrometer) of the back focus of the imaging lens system 400 with temperature change. As shown in FIG. 16, the amount of change of the back focus of the imaging lens system 400 is approximately -6.0 micrometers at or below -40°C and approximately 12 micrometers at or above 80°C. However, by using the lens property (ΔLENS BACK) that the focal length can change with temperature change, the substantial amount of change (defocus) of the back focus of the imaging lens system 400 is reduced to 3.0 micrometers even in the range of -40°C to 80°C.

[0109] Tables 7 and 8 list the lens properties and aspherical surface values of the imaging lens system 400 .

[0110] Table 7 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 73.796 2.549 1.773 49.62 3.60 8.00 -301.8 2 13.356 9.898 3 Second lens -21.157 6.310 1.835 42.72 3.80 8.00 -284.2 4 -27.375 12.715 5 The third lens 74.491 4.790 1.835 42.72 3.80 8.00 -284.2 6 -74.491 5.794 7 Aperture infinity 4.847 8 The fourth lens 19.719 6.925 1.497 81.56 -6.80 8.00 -46.4 9 -30.988 3.171 10 Fifth lens -121.884 2.500 1.808 22.76 -3.70 8.00 -79.5 11 20.397 1.792 12 The sixth lens 25.066 6.017 1.593 68.62 -7.00 11.10 -43.7 13 -67.459 10.091 14 Seventh lens -86.229 6.000 1.770 49.35 3.80 7.40 -401.9 15 -120.000 0.500 16 filter infinity 1.100 1.517 64.17 17 infinity 0.500 18 Cover glass infinity 1.100 1.517 64.17 19 infinity 3.388 20 Image side surface infinity 0.000

[0111] Table 8 Surface number K A B C D 8 -7.72E-01 4.69E-06 2.63E-08 - - 9 -3.47E+00 1.96E-05 -2.34E-08 - - 15 - -5.35E-05 -3.29E-07 -9.15E-10 -4.88E-12 16 - -3.68E-05 -3.84E-07 3.62E-10 1.79E-12

[0112] A fifth example of the imaging lens system will be described with reference to FIG. 17 .

[0113] The camera lens system 500 may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , a sixth lens 560 , and a seventh lens 570 .

[0114] The first lens 510 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 520 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 530 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 540 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 550 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 560 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 570 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0115] The camera lens system 500 may further include a filter 582, a cover glass 584, an image sensor 590, and an aperture ST. The filter 582 and the cover glass 584 may be disposed between the seventh lens 570 and the image sensor 590. The aperture ST may be disposed between the third lens 530 and the fourth lens 540.

[0116] FIG. 18 and FIG. 19 show the aberration properties and MTF properties of the imaging lens system 500. FIG. 20 shows the amount of change (ΔBFL: micrometer) of the back focus of the imaging lens system 500 with temperature change. As shown in FIG. 20, the amount of change of the back focus of the imaging lens system is expected to be approximately -4.0 micrometers at or less than -20°C and approximately 10 micrometers at or greater than 80°C. However, by using the lens property (ΔLENS BACK) that the focal length can change with temperature change, the substantial amount of change (defocus) of the back focus of the imaging lens system 500 is reduced to 2.5 micrometers even in the range of -20°C to 80°C.

[0117] Tables 9 and 10 list the lens properties and aspheric surface values of the imaging lens system 500.

[0118] Table 9 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 73.449 2.590 1.773 49.62 3.60 8.00 -301.8 2 13.367 9.679 1.000 0.00 3 Second lens -21.099 6.296 1.835 42.72 3.80 8.00 -284.2 4 -27.339 12.933 1.000 0.00 5 The third lens 70.821 4.826 1.835 42.72 3.80 8.00 -284.2 6 -70.821 5.420 1.000 0.00 7 Aperture infinity 5.435 1.000 0.00 8 The fourth lens 19.439 6.942 1.497 81.56 -6.80 8.00 -46.4 9 -30.510 2.682 1.000 0.00 10 Fifth lens -94.519 2.500 1.808 22.76 -3.70 8.00 -79.5 11 21.323 2.469 1.000 0.00 12 The sixth lens 25.687 6.178 1.593 68.62 -7.00 11.10 -43.7 13 -62.987 9.450 1.000 0.00 14 Seventh lens -72.856 6.000 1.770 49.35 3.80 7.40 -401.9 15 -120.000 0.500 1.000 0.00 16 filter infinity 1.100 1.517 64.17 17 infinity 0.500 1.000 0.00 18 Cover glass infinity 1.100 1.517 64.17 19 infinity 3.389 1.000 0.00 20 Image side surface infinity 0.000 1.000 0.00

[0119] Table 10 Surface number K A B C D 8 -7.72E-01 6.35E-06 2.83E-08 - - 9 -3.47E+00 2.19E-05 -3.10E-08 - - 15 - -5.36E-05 -3.43E-07 -1.03E-09 -2.78E-12 16 - -3.30E-05 -4.21E-07 6.41E-10 1.35E-12

[0120] A sixth example of the imaging lens system will be described with reference to FIG. 21 .

[0121] The camera lens system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , a sixth lens 660 , and a seventh lens 670 .

[0122] The first lens 610 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 620 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 630 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 640 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 650 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 660 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The seventh lens 670 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface.

[0123] The camera lens system 600 may further include a filter 682, a cover glass 684, an image sensor 690, and an aperture ST. The filter 682 and the cover glass 684 may be disposed between the seventh lens 670 and the image sensor 690. The aperture ST may be disposed between the third lens 630 and the fourth lens 640.

[0124] FIG. 22 and FIG. 23 show the aberration properties and MTF properties of the imaging lens system 600. FIG. 24 shows the amount of change in the back focus of the imaging lens system 600 with temperature change (ΔBFL: micrometer). As shown in FIG. 24, the amount of change in the back focus of the imaging lens system is expected to be approximately -4.0 micrometers at or below -20°C and approximately 10 micrometers at or above 80°C. However, by using the lens property (ΔLENS BACK) that the focal length can change with temperature change, the substantial amount of change (defocus) in the back focus of the imaging lens system 600 is reduced to 2.5 micrometers even in the range of -20°C to 80°C.

[0125] Tables 11 and 12 list the lens properties and aspherical surface values of the imaging lens system 600.

[0126] Table 11 Surface number Remark Radius of curvature Thickness / Gap Refractive Index Abbe number DT CTE VT(10 3) 1 First lens 69.503 1.500 1.773 49.62 3.60 8.00 -301.8 2 12.132 6.891 1.000 0.00 3 Second lens -19.552 6.214 1.835 43.13 3.80 8.00 -289.7 4 -27.113 3.304 1.000 0.00 5 The third lens 52.797 3.324 1.835 43.13 3.80 8.00 -289.7 6 -55.126 9.687 1.000 0.00 7 Aperture infinity 2.811 1.000 0.00 8 The fourth lens 17.961 5.432 1.553 71.68 -7.40 8.00 -46.9 9 -23.868 1.423 1.000 0.00 10 Fifth lens -101.211 1.500 1.808 22.76 -3.70 8.00 -79.5 11 19.934 6.972 1.000 0.00 12 The sixth lens 20.272 6.096 1.619 63.85 -4.20 8.80 -64.3 13 -34.491 5.846 1.000 0.00 14 Seventh lens -22.863 3.000 1.810 40.95 5.60 7.40 -888.4 15 -120.000 0.500 1.000 0.00 16 filter infinity 0.500 1.517 64.17 17 infinity 0.500 1.000 0.00 18 Cover glass infinity 0.500 1.517 64.17 19 infinity 4.006 1.000 0.00 20 Image side surface infinity -0.012 1.000 0.00

[0127] Table 12 Surface number K A B C D 8 -7.72E-01 4.99E-08 6.95E-09 - - 9 -3.47E+00 2.45E-05 -5.69E-08 - - 15 - -9.06E-05 -2.41E-07 1.27E-09 8.58E-12 16 - -4.84E-05 -3.36E-07 2.69E-09 -4.94E-12

[0128] The imaging lens system in the example may have the following optical properties. For example, the total length TTL of the imaging lens system may be in the range of 60 to 100 mm, the focal length f may be in the range of 12.0 to 16.0 mm, the focal length f1 of the first lens may be in the range of -18 mm or less, the focal length f2 of the second lens may be in the range of -20 mm or less, the focal length f3 of the third lens may be in the range of 30 to 50 mm, the focal length f4 of the fourth lens may be in the range of 17 to 30 mm, the focal length f5 of the fifth lens may be in the range of -30 to -10 mm, the focal length f6 of the sixth lens may be in the range of 15 to 40 mm, and the focal length of the seventh lens may be in the range of -20 mm or less.

[0129] FIG. 13 lists optical properties of the imaging lens systems according to the first to sixth examples.

[0130] Table 13 Remark First Example Second Example Third Example Fourth Example Fifth Example Sixth Example f1 -22.583 -22.935<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -60.605<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -21,505<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -21.558<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -19.245<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f2<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -139,896<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -109.963<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -25.371<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -207,282<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -204,707<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -134.125<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f3<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 39,421<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 38,686<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 39,424<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 45,278<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 43,086<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 32,756<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f4<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 25,940<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 26,014<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 27,339<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 25,393<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 25,042<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 19,421<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f5<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -18,599<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -18.686<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -19.986<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -21.454<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -21.324<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -20.495<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f6<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 25.104<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 24,653<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 24,406<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 31,594<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 31,599<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> 21,550<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> f7<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -100.433<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -90,051<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -130.420<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -431,523<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -255.117<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> -35.358<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> TTL<h2 style=";text-align:left;direction:ltr"> 91.243 92.100 99.987 89.987 89.989 70.006 BFL 6.588 6.588 6.590 6.588 6.589 6.006 f 14.257 14.268 14.236 14.189 14.186 14.110

[0131] Table 14 lists the values of conditional equations of the imaging lens systems according to the first example to the sixth example.

[0132] Table 14 equation First Example Second Example Third Example Fourth Example Fifth Example Sixth Example DT -1.500 -1.500 -1.500 -2.500 -2.500 1.500 FWf 11.100 11.100 11.100 11.200 11.200 11.200 DT -12.600 -12.600 -12.600 -13.700 -13.700 -9.700 |DTnF / DTnR| 0.8810 0.8810 0.8810 0.8175 0.8175 1.1546 CTE6-CTE7 3.1000 3.1000 3.1000 3.7000 3.7000 1.4000 1 / (f4*Vt4) -0.0008 -0.0008 -0.0008 -0.0008 -0.0009 -0.0011 1 / (f5*Vt5) 0.0007 0.0007 0.0006 0.0006 0.0006 0.0006 1 / (f6*Vt6) -0.0009 -0.0009 -0.0009 -0.0007 -0.0007 -0.0007 VT4-VT3 246.4 246.4 246.4 237.8 237.8 242.8 VT6-VT7 615.1 615.1 615.1 358.2 358.2 824.1 |(VT1-VT2) / (VT6-VT7)| 0.0286 0.0286 0.0286 0.0491 0.0491 0.0147 V4-V5 58.80 58.80 58.80 58.80 58.80 48.92

[0133] According to the aforementioned examples, an imaging lens system can be provided that can implement constant optical properties at high or low ambient temperatures.

[0134] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made to the examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are intended to be considered illustrative only and not for limiting purposes. The description of features or aspects in each example is intended to be considered applicable to similar features or aspects in other examples. Appropriate results may be achieved if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in a different manner and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not defined by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are intended to be understood to be included in the present disclosure.

[0135] 100, 200, 300, 400, 500, 600: Camera lens system 110, 210, 310, 410, 510, 610: first lens 120, 220, 320, 420, 520, 620: Second lens 130, 230, 330, 430, 530, 630: Third lens 140, 240, 340, 440, 540, 640: fourth lens 150, 250, 350, 450, 550, 650: Fifth lens 160, 260, 360, 460, 560, 660: Sixth lens 170, 270, 370, 470, 570, 670: seventh lens 182, 282, 382, 482, 582, 682: Filter 184, 284, 384, 484, 584, 684: Cover glass 190, 290, 390, 490, 590, 690: Image sensor IMG HT: half the length of the diagonal ST: Aperture ΔBFL: Change ΔLENS BACK: Lens properties

Claims

1. A camera lens system, comprising: A first lens group, comprising a first lens, a second lens, and a third lens; A second lens group, comprising a fourth lens, a fifth lens, a sixth lens, and a seventh lens; An aperture stop is disposed between the first lens group and the second lens group, wherein the first lens group, the aperture stop, and the second lens group are arranged sequentially from an object side toward an imaging plane, wherein the first lens group and the second lens group have a total of seven lenses with refractive power, wherein the first lens has negative refractive power, wherein the sum of the temperature coefficients of the refractive index of the first lens to the third lens in the first lens group, DTnF, is greater than or equal to 5.0 [10-6 / ℃] and less than or equal to 15 [10-6 / ℃], and wherein the sum of the temperature coefficients of the refractive index of the fourth lens to the seventh lens included in the second lens group, DTnR, is greater than or equal to -20 [10-6 / ℃] and less than or equal to -8.0 [10-6 / ℃].

2. The camera lens system as claimed in claim 1, wherein the first lens has a convex object-side surface.

3. The camera lens system as claimed in claim 1, wherein the second lens has a concave object-side surface.

4. The camera lens system as claimed in claim 1, wherein the third lens has a convex object-side surface.

5. The camera lens system as claimed in claim 1, wherein the fourth lens has a convex object-side surface.

6. The camera lens system as claimed in claim 1, wherein the fifth lens has a concave object-side surface.

7. The camera lens system as claimed in claim 1, wherein the sixth lens has a convex object-side surface.

8. The camera lens system as claimed in claim 1, wherein the seventh lens has a concave object-side surface.

9. A camera lens system, comprising: A first lens group, comprising a first lens, a second lens, and a third lens; A second lens group, comprising a fourth lens, a fifth lens, a sixth lens, and a seventh lens; An aperture stop is disposed between the first lens group and the second lens group, wherein the first lens group, the aperture stop, and the second lens group are arranged sequentially from an object side toward an imaging plane, wherein the first lens group and the second lens group have a total of seven lenses with refractive power, wherein the second lens has negative refractive power, wherein the sum of the temperature coefficients of the refractive index of the first lens to the third lens in the first lens group, DTnF, is greater than or equal to 5.0 [10-6 / ℃] and less than or equal to 15 [10-6 / ℃], and wherein the sum of the temperature coefficients of the refractive index of the fourth lens to the seventh lens included in the second lens group, DTnR, is greater than or equal to -20 [10-6 / ℃] and less than or equal to -8.0 [10-6 / ℃].

10. The camera lens system of claim 9, wherein the first lens has a convex object-side surface.

11. The camera lens system of claim 9, wherein the second lens has a concave object-side surface.

12. The camera lens system of claim 9, wherein the third lens has a convex object-side surface.

13. The camera lens system of claim 9, wherein the fourth lens has a convex object-side surface.

14. The camera lens system of claim 9, wherein the fifth lens has a concave object-side surface.

15. The camera lens system of claim 9, wherein the sixth lens has a convex object-side surface.

16. The camera lens system of claim 9, wherein the seventh lens has a concave object-side surface.

Images