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MarketScreener Homepage  >  Equities  >  TAIWAN STOCK EXCHANGE  >  Largan Precision Co., Ltd.    3008   TW0003008009

LARGAN PRECISION CO., LTD.

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Patent Application Titled “Imaging Optical Lens Assembly, Imaging Apparatus And Electronic Device” Published Online (USPTO 20190227277): Largan Precision Co. Ltd.

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08/14/2019 | 05:53pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Taiwan Daily Report -- According to news reporting originating from Washington, D.C., by NewsRx journalists, a patent application by the inventors TANG, HSIANG-CHI (Taichung City, Taiwan); Hsueh, Chun-Che (Taichung City, Taiwan); Chen, Chun-Yen (Taichung City, Taiwan); Tseng, Yu-Tai (Taichung City, Taiwan); Chen, Wei-Yu (Taichung City, Taiwan), filed on July 3, 2018, was made available online on July 25, 2019.

The assignee for this patent application is Largan Precision Co. Ltd. (Taichung City, Taiwan).

Reporters obtained the following quote from the background information supplied by the inventors: “Technical Field

“The present disclosure relates to an imaging optical lens assembly and an imaging apparatus, and more particularly, to an imaging optical lens assembly and an imaging apparatus applicable to electronic devices.

“Description of Related Art

“As semi-conductor manufacturing technology advances, the performance of image sensors has improved along with smaller pixels. Hence, optical lenses with high image quality are becoming an indispensable part of the specification of modem electronic devices. Given the rapid development of technologies, applications of electronic devices with an optical lens imaging apparatus are expanding tremendously and the demands for optical lenses have diversified. It is difficult for conventional optical lenses to obtain a good balance among imaging quality, sensitivity, aperture size, volume, and field of view, this present application provides an imaging optical lens assembly aiming to meet the aforementioned requirements.”

In addition to obtaining background information on this patent application, NewsRx editors also obtained the inventors’ summary information for this patent application: “According to the present disclosure, an imaging optical lens assembly includes seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seven lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The seventh lens element has an image-side surface being concave in a paraxial region thereof and having at least one critical point in an off-axis region thereof, wherein the image-side surface and an object-side surface of the seventh lens element are both aspheric. An Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a focal length of the imaging optical lens assembly is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the fifth lens element is R10, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the sixth lens element and the seventh lens element is T67, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the imaging optical lens assembly is ImgH, and the following conditions are satisfied:

“V2+V3.ltoreq.60;

“0.ltoreq.f/R5;

“0.ltoreq.f/R10;

“T67/T45<8.0; and

“TL/ImgH<1.80.

“According to another aspect of the present disclosure, an imaging apparatus includes the aforementioned imaging optical lens assembly and an image sensor.

“According to another aspect of the present disclosure, an electronic device includes the aforementioned imaging apparatus.

“According to another aspect of the present disclosure, an imaging optical lens assembly includes seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof; the second lens element has negative refractive power; the seventh lens element has an object-side surface being convex in a paraxial region thereof, an image-side surface being concave in a paraxial region thereof and having at least one critical point in an off-axis region thereof, wherein the image-side surface and the object-side surface of the seventh lens element are both aspheric. An Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a focal length of the imaging optical lens assembly is f, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:

“V2+V3 70;

“0.ltoreq.f/R5; and

“0.ltoreq.f/R10.”

The claims supplied by the inventors are:

“1. An imaging optical lens assembly, comprising seventh lens elements, the seventh lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element; wherein the first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof; the second lens element has negative refractive power; and the seventh lens element has an image-side surface being concave in a paraxial region thereof and at least one critical point in an off-axis region thereof, while the image-side surface and an object-side surface of the seventh lens element being both aspheric; wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a focal length of the imaging optical lens assembly is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the fifth lens element is R10, an axial distance between the fourth lens element and the fifth lens element on the optical axis is T45, an axial distance between the sixth lens element and the seventh lens element is T67, an axial distance between the first lens element and an image surface is TL, a maximum image height of the imaging optical lens assembly is ImgH, and the following conditions are satisfied: V2+V3.ltoreq.60; 0.ltoreq.f/R5; 0.ltoreq.f/R10; T67/T45<8.0; and TL/ImgH<1.80.

“2. The imaging optical lens assembly of claim 1, wherein the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, and the following condition is satisfied: 20<V2+V3<50.

“3. The imaging optical lens assembly of claim 1, wherein a vertical distance between a convex critical point farthest away from the optical axis within a maximum effective diameter of an image-side surface of the sixth lens element and the optical axis is Yc62; a vertical distance between a convex critical point farthest away from the optical axis within a maximum effective diameter of the image-side surface of the seventh lens element and the optical axis is Yc72, and the following condition is satisfied: 0.20<Yc62/Yc72<1.70.

“4. The imaging optical lens assembly of claim 1, wherein the sixth lens element has positive refractive power.

“5. The imaging optical lens assembly of claim 1, wherein a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, and the following condition is satisfied: 0.75<CT4/(CT2+CT3)<2.5.

“6. The imaging optical lens assembly of claim 1, wherein the fourth lens element has an object-side surface being convex in a paraxial region thereof.

“7. The imaging optical lens assembly of claim 1, wherein an Abbe number of one lens elements is V, a refractive index of the said lens element is N, an Abbe number of the first element is V1, and the following conditions are satisfied: 50<V1; and at least one of the lens elements satisfies 8.0<V/N<12.5.

“8. The imaging optical lens assembly of claim 1, wherein the focal length of the imaging optical lens assembly is f, a focal length of the sixth lens element is f6, and the following condition is satisfied: 0.50<f/f6<1.80.

“9. The imaging optical lens assembly of claim 1, wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, the axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, the axial distance between the sixth lens element and the seventh lens element is T67, and the following condition is satisfied: (T12+T34+T45+T56)/(T23+T67)<1.0.

“10. The imaging optical lens assembly of claim 1, wherein the third lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the third lens element has at least one critical point in an off-axis region thereof.

“11. The imaging optical lens assembly of claim 1, wherein a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of an image-side surface of the sixth lens element is R12, and the following condition is satisfied: (R11+R12)/(R11-R12)<0.65.

“12. The imaging optical lens assembly of claim 1, wherein the second lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.

“13. The imaging optical lens assembly of claim 1, wherein a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of an image-side surface of the first lens element is Y12, a maximum effective radius of an object-side surface of the second lens element is Y21, a maximum effective radius of an image-side surface of the second lens element is Y22, a maximum effective radius of the object-side surface of the third lens element is Y31, a maximum effective radius of an object-side surface of the fourth lens element is Y41, a maximum effective radius of an image-side surface of the fourth lens element is Y42, a maximum effective radius of an object-side surface of the fifth lens element is Y51, a maximum effective radius of the image-side surface of the fifth lens element is Y52, a maximum effective radius of an object-side surface of the sixth lens element is Y61, a maximum effective radius of an image-side surface of the sixth lens element is Y62, a maximum effective radius of the object-side surface of the seventh lens element is Y71, a maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following conditions are satisfied: Y31/Y11<1.0; Y31/Y12<1.0; Y31/Y21<1.0; Y31/Y22<1.0; Y31/Y41<1.0; Y31/Y42<1.0; Y31/Y51<1.0; Y31/Y52<1.0; Y31/Y61<1.0; Y31/Y62<1.0; Y31/Y71<1.0; and Y31/Y72<1.0.

“14. The imaging optical lens assembly of claim 1, wherein a total number of the lens elements having an Abbe number less than 25 is V25, and the following condition is satisfied: 3.ltoreq.V25.

“15. The imaging optical lens assembly of claim 1, wherein an Abbe number of a lens element is V, a refractive index of the said lens element is N, and at least one of the seven lens elements satisfies the following condition: 8.0<V/N<12.0.

“16. The imaging optical lens assembly of claim 1, wherein an entrance pupil diameter of the imaging optical lens assembly is EPD, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following condition is satisfied: 4.50<EPD/(CT2+CT3)<9.0.

“17. The imaging optical lens assembly of claim 1, wherein a highest refractive index of a lens element among the seven lens elements is Nmax, and the following condition is satisfied: 1.650<Nmax<1.750.

“18. The imaging optical lens assembly of claim 1, wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fifth lens element is CT5, and the following condition is satisfied: 0.75<CT1/(CT2+CT3+CT5)<2.0.

“19. The imaging optical lens assembly of claim 1, wherein the focal length of the imaging optical lens assembly is f, a focal length of a lens element is fx, a parameter of the refractive power of the said lens element is Px, and the following conditions are satisfied: Px=f/fx,x=2.about.7; and 0.25<(|P2|+|P3|+|P4|+|P5|)/(|P6|+|P7|)<1.0.

“20. The imaging optical lens assembly of claim 1, wherein an f-number of the imaging optical lens assembly is Fno, the axial distance between the object-side surface of the first lens element and the image surface is TL, the maximum image height of the imaging optical lens assembly is ImgH, and the following conditions are satisfied: 1.0<Fno.ltoreq.1.70; and 1.0<TL/ImgH<1.60.

“21. An imaging apparatus, comprising the imaging optical lens assembly of claim 1 and an image sensor disposed on the image surface of the imaging optical lens assembly.

“22. An electronic device, comprising the imaging apparatus of claim 21.

“23. An imaging optical lens assembly, comprising seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element; wherein the first lens element has positive refractive power and an object-side surface being convex in a paraxial region thereof; the second lens element has negative refractive power; and, the seventh lens element has an object-side surface being convex in a paraxial region thereof, an image-side surface being concave in a paraxial region and having at least one critical point in an off-axis region thereof; the image-side surface and the object-side surface of the seventh lens element are both aspheric; wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a focal length of the imaging optical lens assembly is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the fifth lens element is R10, and the following conditions are satisfied: V2+V3.ltoreq.70; 0.ltoreq.f/R5; and 0.ltoreq.f/R10.

“24. The imaging optical lens assembly of claim 23, wherein a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of an image-side surface of the first lens element is Y12, a maximum effective radius of an object-side surface of the second lens element is Y21, a maximum effective radius of an image-side surface of the second lens element is Y22, a maximum effective radius of the object-side surface of the third lens element is Y31, a maximum effective radius of an object-side surface of the fourth lens element is Y41, a maximum effective radius of an image-side surface of the fourth lens element is Y42, a maximum effective radius of an object-side surface of the fifth lens element is Y51, a maximum effective radius of the image-side surface of the fifth lens element is Y52, a maximum effective radius of an object-side surface of the sixth lens element is Y61, a maximum effective radius of an image-side surface of the sixth lens element is Y62, a maximum effective radius of the object-side surface of the seventh lens element is Y71, a maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following conditions are satisfied: Y31/Y11<1.0; Y31/Y12<1.0; Y31/Y21<1.0; Y31/Y22<1.0; Y31/Y41<1.0; Y31/Y42<1.0; Y31/Y51<1.0; Y31/Y52<1.0; Y31/Y61<1.0; Y31/Y62<1.0; Y31/Y71<1.0; and Y31/Y72<1.0.

“25. The imaging optical lens assembly of claim 23, wherein a highest refractive index of a lens element among the seven lens elements is Nmax, and the following condition is satisfied: 1.650<Nmax<1.750.

“26. The imaging optical lens assembly of claim 23, wherein the focal length of the imaging optical lens assembly is f, a focal length of a lens element is fx, a parameter of the refractive power of the said lens element is Px, and the following conditions are satisfied: Px=f/fx,x=2.about.7; and 0.25<(|P2|+|P3|+|P4|+|P5|)/(|P6|+|P7|)<1.0.

“27. The imaging optical lens assembly of claim 23, wherein a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, and the following condition is satisfied: 0.75<CT4/(CT2+CT3)<2.0.

“28. The imaging optical lens assembly of claim 23, wherein a total number of the lens elements having an Abbe number less than 25 is V25, and the following condition is satisfied: 3.ltoreq.V25.

“29. The imaging optical lens assembly of claim 23, wherein an entrance pupil diameter of the imaging optical lens assembly is EPD, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following condition is satisfied: 4.50<EPD/(CT2+CT3)<9.0.

“30. The imaging optical lens assembly of claim 23, wherein an Abbe number of a lens element is V and a refractive index of the said lens element is N, and at least one lens element of the seven lens elements satisfies the following condition: 8.0<V/N<12.0.”

For more information, see this patent application: TANG, HSIANG-CHI; Hsueh, Chun-Che; Chen, Chun-Yen; Tseng, Yu-Tai; Chen, Wei-Yu. Imaging Optical Lens Assembly, Imaging Apparatus And Electronic Device. Filed July 3, 2018 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190227277%22.PGNR.&OS=DN/20190227277&RS=DN/20190227277

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Taiwan Daily Report, source Geographic Newsletters

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