TWI767395B - Optical imaging capturing lens assembly and electronic imaging capturing device containing the same - Google Patents

Abstract

An optical imaging capturing lens assembly is disclosed, including a first lens to a tenth lens and an aperture. The optical imaging capturing lens assembly disclosed in the present invention has the characteristics of a high resolution capable of resolving a pixel size of 3.5 microns, an ultra-low distortion rate of less than 0.01%, a large viewing angle of 52 degrees, and a variable magnification of 0.14 to 0.025. With the linear sensor, its high resolution and ultra-low distortion rate characteristics can detect the current highest level of 8k TV LCD panels, and because of the variable magnification, it can detect panels from 17 inches to 98 inches. Due to the optical imaging capturing lens assembly disclosed in the present invention has a large viewing angle characteristic, and the maximum detection distance can be controlled to 2.4 meters when detecting a 98-inch panel.

Description

Optical imaging lens assembly and electronic imaging device including the same

The present invention relates to an optical image pickup lens assembly and an electronic image pickup device including the same, in particular to an optical image pickup lens assembly with high resolution, ultra-low distortion, large field of view and variable magnification, etc. A characteristic optical imaging lens combination and an electronic imaging device comprising the same.

The TV panel resolution has gradually developed from 1920x1080 to 3840x2160 with 4k resolution, and the latest 7680x4320 display with 8k resolution. Machine vision inspection is necessary for defect inspection of up to 33 million pixels on a 98-inch 8k panel, and the inspection lens is the key component of machine vision inspection.

The specification of the inspection lens must be higher than that of the general commercial lens. For example, the ultra-low distortion is conducive to the detection and judgment of defects, while the distortion of the general commercial lens is only about 1%. If it can have an ultra-low distortion rate of less than ±0.01%, it can resolve the pixel size of 3.5 microns, which means that it can resolve the pixel defects of the 8k TV LCD panel. Generally, the detection lenses are mostly fixed magnifications, and can only detect fixed size panels. If the magnification of the detection lens is variable, it is more economical. If the detection lens has a large viewing angle, the detection distance can be effectively controlled within an acceptable range, so as to avoid the factory building being unable to accommodate due to the long detection distance.

It can be understood from the above description that the technical problem to be solved is to provide an optical imaging lens combination with characteristics such as high resolution, ultra-low distortion (distortion), large viewing angle (field of view, FOV) and variable magnification, and the combination thereof. The electronic imaging device.

Based on the above purpose, the present invention provides an optical imaging lens combination suitable for detecting pixel defects of 17-inch to 98-inch TV liquid crystal panel displays, comprising ten lenses and apertures, from the object side to the image side, the order is the first lens to tenth lens. The first lens, the fifth lens and the tenth lens are aspherical lenses and are plastic lenses, and the other lenses are spherical lenses and are glass lenses.

The aperture is set between the fourth lens and the fifth lens, the effective focal length (EFL) of the optical image-taking lens combination is 60 mm, and the focal ratio (f-number, F/#) of the optical image-taking lens combination is greater than equal to 5 and less than or equal to 7. The viewing angle of the optical image taking lens combination is 52 degrees.

According to the embodiment of the present invention, the focal lengths of the first lens to the tenth lens are negative 45.5 mm, negative 123.4 mm, positive 47.9 mm, positive 131.5 mm, positive 39.8 mm, negative 17.8 mm, positive 26.1 mm, negative 20.3 mm , is 38.6 mm and is 66.1 mm.

According to the embodiment of the present invention, the Abbe numbers of the first lens, the fifth lens and the tenth lens are equal, the Abbe numbers of the second lens and the ninth lens are equal, and the Abbe numbers of the fourth lens and the seventh lens are equal. The number of shells is equal.

According to the embodiment of the present invention, the Abbe numbers of the first lens to the tenth lens are 57.4, 23.8, 29.8, 81.5, 57.4, 33.8, 81.5, 37, 23.8 and 57.4 in sequence.

According to an embodiment of the present invention, the refractive indices of the first lens, the fifth lens and the tenth lens are equal, the refractive indices of the second lens and the ninth lens are equal, and the refractive indices of the fourth lens and the seventh lens are equal.

According to the embodiment of the present invention, the refractive indices of the first lens to the tenth lens are 1.49, 1.85, 1.8, 1.5, 1.49, 1.65, 1.5, 1.61, 1.85 and 1.49 in sequence.

According to an embodiment of the present invention, the radius of curvature of the first lens to the tenth lens on the object side is positive 200 mm, positive 173.75 mm, positive 49.82 mm, positive 25.53 mm, and positive 45 mm. , minus 30.58 mm, plus 19.07 mm, minus 14.73 mm, plus 85.38 mm and minus 195.22 mm, and the curvature radius of the first lens to the tenth lens on the image side is plus 20.04 mm, plus 64.83 mm, minus 160.02 mm mm, plus 40.23 mm, minus 33.34 mm, plus 19.07 mm, minus 37.09 mm, plus 85.38 mm, minus 51.93 mm and minus 28.12 mm.

According to an embodiment of the present invention, the fifth lens to the tenth lens are moving groups, and the total track length (TTL) of the first lens to the tenth lens is between 78.3 mm and 79 mm, and the first lens to The back focal length (BFL) of the tenth lens is between 71.9 mm and 79 mm, and the image circle of the combination of the optical imaging lenses is between 55 mm and 65 mm.

According to the embodiment of the present invention, the working distance of the optical imaging lens combination is in the range of 438 mm to 2415 mm, and the corresponding magnification is in the range of 0.14 to 0.025.

Based on the above objective, the present invention also provides an electronic imaging device, comprising the above-mentioned optical imaging lens group and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the optical imaging lens group.

Based on the above objective, the present invention also provides an optical imaging lens combination, which includes a fixed lens group, a movable lens group, and an aperture. The movable lens group is disposed on the image side of the fixed lens group, wherein the effective focal length of the combination of the fixed lens group and the movable lens group is 60 mm.

The focal ratio of the combination of the fixed lens group and the movable lens group is greater than or equal to 5 and less than or equal to 7. The combined viewing angle of the fixed lens group and the movable lens group is 52 degrees, and the aperture is set between the fixed lens group and the movable lens group.

Based on the above, the optical image pickup lens assembly and the electronic image pickup device including the optical image pickup lens assembly according to the embodiments of the present invention have the following advantages:

(1) It has the advantages of high resolution capable of resolving pixel size of 3.5 microns, ultra-low distortion of less than 0.01%, large viewing angle of ±26 degrees, and variable magnification of 0.14 to 0.025.

(2) Due to the above variable magnification, it is possible to detect pixel defects in panels ranging from 17 inches to 98 inches. Compared with most fixed magnification inspection lenses, the construction cost of inspection equipment can be greatly reduced.

(3) Due to the above variable magnification, when inspecting panels from 17 inches to 98 inches, the working distance can be maintained in the range of 438 mm to 2415 mm, so as to avoid the over-long inspection distance that will cause the workshop to be unable to accommodate.

10: Optical image taking lens combination

20: Acquisition electronics

100: Move groups

L1~L10: Lens

STO: Aperture

SUM: Imaging plane

In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

FIG. 1 is a schematic structural diagram of an optical image pickup lens assembly and an electronic image pickup device including the optical image pickup lens assembly according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the calculation of the total distortion of the Seed aberration of the optical imaging lens combination according to an embodiment of the present invention.

FIG. 3 is a simulation diagram of the distortion rate of the object to be detected on the imaging surface of the optical imaging lens combination according to the embodiment of the present invention.

FIG. 4 is a schematic diagram of working distances of objects to be detected with different sizes of the optical imaging lens combination according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 . The descriptions are not intended to limit the embodiments of the present invention, but are merely examples of the present invention.

Referring to FIG. 1 , it is a schematic structural diagram of an optical image pickup lens assembly and an electronic image pickup device including the optical image pickup lens assembly according to an embodiment of the present invention. As shown in the figure, the optical image pickup lens assembly 10 disclosed in the embodiment of the present invention is suitable for detecting pixel defects of 17-inch to 98-inch TV LCD panel displays, including ten lenses (ie L1 to L10) and aperture STO, The first lens L1 to the tenth lens L10 are sequentially from the object side to the image side.

The first lens L1 , the fifth lens L5 and the tenth lens are aspherical lenses and are plastic lenses, and the other lenses are spherical lenses and are glass lenses. The aperture STO is disposed between the fourth lens L4 and the fifth lens L5. The effective focal length of the optical image taking lens assembly 10 is 60 mm. The focal ratio of the optical imaging lens assembly 10 is greater than or equal to 5 and less than or equal to 7. The viewing angle of the optical imaging lens assembly 10 is 52 degrees.

The above-mentioned effective focal length can be used to evaluate the ability of the optical system to collect or diverge light. Usually, the optical system with a short focal length has a greater light-gathering ability than an optical system with a long focal length. Light diverges. Focal ratio, also known as F-number, relative aperture or aperture value, is usually a parameter used by optical systems to evaluate light-gathering power. It refers to the ratio of focal length to aperture diameter. The smaller the value, the greater the light-gathering power.

The above-mentioned spherical lens and aspherical lens refer to whether the radius of curvature of each point on the lens surface is constant. In addition, considering the difficulty and cost of fabrication, a lens made of plastic material that is easier to fabricate and has a lower cost can also be used.

According to the embodiment of the present invention, the focal lengths of the first lens L1 to the tenth lens L10 are negative 45.5 mm, negative 123.4 mm, positive 47.9 mm, positive 131.5 mm, positive 39.8 mm, negative 17.8 mm, positive 26.1 mm, negative 20.3mm, plus 38.6mm and plus 66.1mm.

According to the embodiment of the present invention, the Abbe numbers of the first lens L1, the fifth lens L5 and the tenth lens L10 are the same, the Abbe numbers of the second lens L2 and the ninth lens L9 are the same, the fourth lens L4 and the seventh lens are the same The Abbe numbers of L7 are equal.

The above Abbe number can be used to evaluate the degree of dispersion caused by the use of different materials for the lens. It is usually evaluated by three fixed wavelengths of light (helium yellow line 587.56 nm, hydrogen blue line 486.1 nm and hydrogen The red line is 656.3 nm), when the degree of dispersion is larger, the Abbe number is smaller. Generally, the Abbe number of glass materials is between 20 and 90.

According to the embodiment of the present invention, the Abbe numbers of the first lens L1 to the tenth lens L10 are 57.4, 23.8, 29.8, 81.5, 57.4, 33.8, 81.5, 37, 23.8 and 57.4 in sequence.

According to the embodiment of the present invention, the first lens L1, the fifth lens L5 and the tenth lens L10 have the same refractive index, the second lens L2 and the ninth lens L9 have the same refractive index, and the fourth lens L4 and the seventh lens L7 have the same refractive index. The refractive indices are equal.

The above-mentioned refractive index is also similar to the Abbe number, which also describes the degree of dispersion caused by the use of different materials for the lens, that is, the light entering the lens from the air has different degrees of deflection for different wavelengths. Generally, the refractive index of a lens made of glass is between 1 and 2. When the refractive index of the refractive index relative to the vacuum is larger, it means that when the light enters the lens, the deviation angle is larger.

According to the embodiment of the present invention, the refractive indices of the first lens L1 to the tenth lens L10 are 1.49, 1.85, 1.8, 1.5, 1.49, 1.65, 1.5, 1.61, 1.85 and 1.49 in sequence.

According to the embodiment of the present invention, the curvature radii of the first lens L1 to the tenth lens L10 on the object side are in sequence plus 200 mm, plus 173.75 mm, plus 49.82 mm, plus 25.53 mm, plus 45 mm, minus 30.58 mm, plus 19.07mm, minus 14.73mm, plus 85.38mm and minus 195.22mm.

The curvature radii of the first lens L1 to the tenth lens L10 on the image side are in sequence plus 20.04 mm, plus 64.83 mm, minus 160.02 mm, plus 40.23 mm, minus 33.34 mm, plus 19.07 mm, minus 37.09 mm, plus 85.38 mm, minus 51.93 mm and minus 28.12 mm.

The aforementioned curvature radius of the object side and the curvature radius of the image side respectively represent the degree of curvature of the side of the lens surface to be detected, and the degree of curvature of the side of the lens surface facing the imaging surface SUM. When the shape of the lens is asymmetrical, two radii of curvature are required to represent the geometry of the lens.

The value of the radius of curvature on the object side, if it is a positive value, it means that the side of the lens on the object side is convex, and if it is a negative value, it means that the side of the lens on the object side is concave. The definition on the image side is the opposite. If the value of the radius of curvature on the image side is positive, it means that the lens is concave on the object side, and if it is negative, it means the lens is convex on the object side. Generally, the smaller the value of the radius of curvature, the greater the curvature, and when the value of the radius of curvature approaches infinity, it represents a plane.

According to the embodiment of the present invention, the fifth lens L5 to the tenth lens L10 are the moving group 100, and the total track length (TTL) of the first lens L1 to the tenth lens L10 is between 78.3 mm and 79 mm, And the back focal length (BFL) of the first lens L1 to the tenth lens L10 is between 71.9 mm and 79 mm, and the image circle of the optical imaging lens combination 10 is between 55 mm and 65 mm.

Table 1 lists the characteristics of the above-mentioned first lens L1 to tenth lens L10:

Referring to FIG. 2 , it is a schematic diagram of calculating the total distortion of the Seed aberration of the optical imaging lens combination according to an embodiment of the present invention. As shown in the figure, the characteristics from the first lens L1 to the tenth lens L10 The total image properties of the object to be detected, such as spherical aberration, coma aberration, astigmatism, field curvature and distortion.

After the above optical properties are calculated, a Seidel diagram representing the sum of the aberrations can be obtained. The numbers at the top of Figure 2, namely 1 to 8, STO, 10 to 21 and SUM, represent the object side of the first lens L1, the image side of the first lens L1 to the image side of the fourth lens L4, the aperture, the The object side of the five lens elements L5, the image side of the fifth lens element L5 to the image side of the tenth lens element L10, the imaging surface SUM calculates the results of the aforementioned optical characteristics, which is the optical imaging lens group 10 according to the embodiment of the present invention. the optical properties.

The optical characteristics, such as the resolution, of the optical image pickup lens group 10 according to the embodiment of the present invention can be evaluated using a modulation transfer function (MTF). The modulation transfer function represents the resolving power and reducing power of the optical system.

The unit of resolution is line pair/mm (lp/mm), and one black and one white line is a line pair. Usually, the resolution of the lens is measured by shooting a standard resolution plate/sine grating to see how much the highest resolution can be. Line density. By imaging with an optical system, the measured result of the object to be detected is the restoration of contrast or resolution. If the performance of the resulting image is exactly the same as the standard resolution version (representing the ability to restore, that is, the better the contrast), its MTF value is 1, and if it cannot be resolved at all, it is 0. The number of line pairs that can be resolved per millimeter is the value of resolution.

Referring to FIG. 3 , it is a simulation diagram of the distortion rate of the object to be detected on the imaging surface of the optical imaging lens combination according to the embodiment of the present invention. As shown in the figure, the object to be detected is focused on the imaging surface SUM through the optical imaging lens group 10, wherein the vertical axis represents different positions of the image, and the distortion rate is less than 0.01% at each position.

According to the modulation transfer function of the optical imaging lens group 10 of the embodiment of the present invention, the MTF contrast ratio of 30% can be achieved at 142lp/mm, and the MTF contrast ratio of 70% can be achieved at 47lp/mm.

Embodiments of the present invention also provide an electronic imaging device 20, such as the above-mentioned optical imaging lens group 10, and an electronic photosensitive element (not shown in the figure) disposed on the imaging surface SUM of the optical imaging lens group 10.

The above-mentioned optical imaging lens group 10 is matched with an electronic photosensitive element, so that the light emitted by the object to be detected can be focused on the electronic photosensitive element on the imaging surface SUM through the optical imaging lens group 10 to form a detection image.

In addition, the fifth lens L5 to the tenth lens L10 in the optical imaging lens group 10 according to the embodiment of the present invention are the moving group 100. By adjusting the distance between the moving group 100 and the fourth lens L4, the moving group is the moving group. The air gap between the group 100 and the aperture STO enables the object to be detected and the first lens L1 to be accurately focused on the imaging surface SUM even when the distance between the object to be detected and the first lens L1 varies.

In the electronic imaging device 20 according to the embodiment of the present invention, the magnification can be from 0.14x to 0.025x. With a 16k/3.5 micron line scan camera, or backward compatible with a 12k/5 micron line sensor, it can detect resolutions ranging from 25 microns to 140 microns, corresponding to 17-inch to 98-inch TVs Liquid crystal panel displays are used for optical inspection of pixel defects.

Referring to FIG. 4 , it is a schematic diagram of working distances of objects to be detected of different sizes of the optical imaging lens assembly 10 according to an embodiment of the present invention. As shown in the figure, when the distance between the object to be detected and the first lens L1 of the optical imaging lens combination 10 is 800 mm, the air gap between the fourth lens L4 and the aperture STO is about 0.78 mm, and the back focal length is about 75 mm, at this time The magnification is 0.07x.

When the size of the detection panel is 17 inches, it can be placed at a distance of 438 mm from the object side of the first lens L1 in the electronic imaging device 20. At this time, the air gap between the fourth lens L4 and the aperture STO is about 0.42 mm. The back focal length is about 79mm, and the magnification at this time is 0.14x.

When the size of the detection panel is 98 inches, it can be placed at a distance of 2415 mm from the object side of the first lens L1 in the electronic imaging device 20. At this time, the air gap between the fourth lens L4 and the aperture STO is about 1.09 mm. The back focal length is about 71.9 mm, and the magnification at this time is 0.025x.

The optical imaging lens assembly 10 according to the embodiment of the present invention is matched with the above-mentioned moving group 100, and the diameter of the imaging range is 62 mm, which can achieve a detection range with a viewing angle of 52 degrees.

The above description is exemplary only, not limiting. Any modifications or changes that do not depart from the spirit and scope of the present invention are included in the scope of the appended patent application.

10: Optical image taking lens combination

20: Acquisition electronics

100: Move groups

L1~L10: Lens

STO: Aperture

SUM: Imaging plane

Claims (11)

An optical imaging lens combination, suitable for detecting pixel defects of 17-inch to 98-inch TV liquid crystal panel displays, includes ten lenses and an aperture, and sequentially from an object side to an image side is a first lens to a first lens Ten lenses; wherein the first lens, the fifth lens and the tenth lens are aspherical lenses and are plastic lenses, and the remaining lenses are lenses with spherical surfaces and are glass lenses, wherein the aperture is arranged on the fourth lens and the fifth lens; an effective focal length (EFL) of the optical imaging lens combination is 60 mm; a focal ratio (f-number) of the optical imaging lens combination is greater than or equal to 5 and less than is equal to 7; a field of view (FOV) of the optical imaging lens combination is 52 degrees. The optical imaging lens combination as claimed in claim 1, wherein the focal lengths of the first lens to the tenth lens are negative 45.5 mm, negative 123.4 mm, positive 47.9 mm, positive 131.5 mm, positive 39.8 mm, negative 17.8 mm mm, plus 26.1 mm, minus 20.3 mm, plus 38.6 mm and plus 66.1 mm. The optical imaging lens combination as claimed in claim 1, wherein the Abbe numbers of the first lens, the fifth lens and the tenth lens are equal, and the Abbe numbers of the second lens and the ninth lens are equal If the numbers are equal, the Abbe numbers of the fourth lens and the seventh lens are equal. The optical imaging lens combination of claim 1, wherein the Abbe numbers of the first lens to the tenth lens are 57.4, 23.8, 29.8, 81.5, 57.4, 33.8, 81.5, 37, 23.8 and 57.4 in sequence. The optical imaging lens combination as claimed in claim 1, wherein the refractive indices of the first lens, the fifth lens and the tenth lens are equal, and the refractive indices of the second lens and the ninth lens are equal are equal, the refractive indices of the fourth lens and the seventh lens are equal. The optical imaging lens combination as claimed in claim 1, wherein the refractive indices of the first lens to the tenth lens are 1.49, 1.85, 1.8, 1.5, 1.49, 1.65, 1.5, 1.61, 1.85 and 1.49 in sequence. The optical imaging lens combination of claim 1, wherein the radius of curvature of the first lens to the tenth lens on the object side is positive 200 mm, positive 173.75 mm, positive 49.82 mm, plus 25.53mm, plus 45mm, minus 30.58mm, plus 19.07mm, minus 14.73mm, plus 85.38mm and minus 195.22mm; and the curvature radius of the first lens to the tenth lens on the image side in sequence is plus 20.04 mm, plus 64.83 mm, minus 160.02 mm, plus 40.23 mm, minus 33.34 mm, plus 19.07 mm, minus 37.09 mm, plus 85.38 mm, minus 51.93 mm and minus 28.12 mm. The optical imaging lens combination of claim 1, wherein the fifth lens to the tenth lens are a moving group, and a total track length (TTL) of one of the first lens to the tenth lens between 78.3 mm and 79 mm, and one of the back focal lengths (BFL) of the first lens to the tenth lens is between 71.9 mm and 79 mm, and an imaging range (image) of the combination of the optical imaging lenses circle) between 55mm and 65mm. The optical imaging lens combination as claimed in claim 1, wherein a working distance of the optical imaging lens combination is in the range of 438 mm to 2415 mm, and a corresponding magnification is in the range of 0.14 to 0.025. An electronic imaging device, comprising the optical imaging lens combination according to any one of claim 1 to claim 8; and an electronic photosensitive element disposed on an imaging surface of the optical imaging lens group. An optical imaging lens combination, comprising: a fixed lens group; a moving lens group, disposed on an image side of the fixed lens group; wherein an effective focal length of the combination of the fixed lens group and the moving lens group is 60 mm; the fixed lens group A focal ratio of the combination of the group and the movable lens group is greater than or equal to 5 and less than or equal to 7; a viewing angle of the combination of the fixed lens group and the movable lens group is 52 degrees; and an aperture is arranged on the fixed lens group between the lens group and the moving lens group.

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