Patents by Inventor Chun Shan Chen

Chun Shan Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20110115962
    Abstract: This invention provides an image-capturing lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; a fourth lens element with negative refractive power having a concave image-side surface on which at least one inflection point is formed, the object-side and image-side surfaces thereof being aspheric; and a stop disposed between an imaged object and the first lens element; wherein there are four lens elements with refractive power. Such an arrangement of optical elements can effectively reduce the size of the lens assembly, mitigate the sensitivity of the optical system and enable the lens assembly to obtain a higher resolution.
    Type: Application
    Filed: May 25, 2010
    Publication date: May 19, 2011
    Applicant: LARGAN PRECISION CO., LTD.
    Inventors: Chun Shan Chen, Hsiang Chi Tang, Tsung Han Tsai
  • Patent number: 7916401
    Abstract: An optical lens system for taking image comprises, in order from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a plastic second lens element with negative refractive power having a concave object-side surface, a convex image-side surface and at least one aspheric surface; a plastic third lens element with negative refractive power having a convex object-side surface, a concave image-side surface and at least one aspheric surface. The number of the lens elements with refractive power being limited to three. Focal lengths of the optical lens system, the first lens element, the second lens element and the third lens element are f, f1, f2, f3 respectively; Abbe numbers of the first and second lens elements are V1, V2 respectively, an on-axis distance between second and third lens elements is T23, and they satisfy the relations: 0.8<f/f1<1.8; 0<|f/f2|<0.8; 0<|f/f3|<0.
    Type: Grant
    Filed: September 19, 2009
    Date of Patent: March 29, 2011
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun-Shan Chen, Tsung-Han Tsai
  • Publication number: 20110013069
    Abstract: This invention provides an imaging lens system including, in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power; a third lens having a concave image-side surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power having a concave image-side surface, at least one surface thereof having at least one inflection point; and an aperture stop disposed between an imaged object and the third lens. The on-axis spacing between the first lens and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<(T12/f)×100<15.
    Type: Application
    Filed: January 8, 2010
    Publication date: January 20, 2011
    Applicant: LARGAN PRECISION CO., LTD.
    Inventor: Chun-Shan Chen
  • Patent number: 7869142
    Abstract: An optical lens system for taking image has, in order from the object side to the image side: a positive first lens element with a convex object-side surface; a negative plastic second lens element with a concave object-side surface; a negative plastic third lens element with a concave object-side surface; a positive fourth lens element with a concave image-side surface; and an aperture stop located between an object to be photographed and the second lens element. The second lens element is provided with at least one aspheric surface, the third lens element is provided with at least one aspheric surface, and the fourth lens element is formed with inflection points. An on-axis distance between the first and second lens elements is T12, a focal length of the optical lens system for taking image is f, they satisfy the relation: (T12/f)*100>0.7.
    Type: Grant
    Filed: January 10, 2009
    Date of Patent: January 11, 2011
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun-Shan Chen, Hsiang-Chi Tang, Tsung-Han Tsai
  • Patent number: 7864454
    Abstract: The present invention provides an imaging lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; a fourth lens element, the image-side surface thereof being aspheric and provided with at least one inflection point; a fifth lens element having a concave object-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and an aperture stop disposed between an imaged object and the second lens element. Such an arrangement of optical elements can effectively reduce the total track length and sensitivity of the optical system, and image quality can also be improved.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: January 4, 2011
    Assignee: Largan Precision Co., Ltd.
    Inventors: Hsiang-Chi Tang, Chun-Shan Chen, Ming-Ching Lin
  • Publication number: 20100321798
    Abstract: An optical lens system for taking image comprises, in order from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a plastic second lens element with negative refractive power having a concave object-side surface, a convex image-side surface and at least one aspheric surface; a plastic third lens element with negative refractive power having a convex object-side surface, a concave image-side surface and at least one aspheric surface. The number of the lens elements with refractive power being limited to three. Focal lengths of the optical lens system, the first lens element, the second lens element and the third lens element are f, f1, f2, f3 respectively; Abbe numbers of the first and second lens elements are V1, V2 respectively, an on-axis distance between second and third lens elements is T23, and they satisfy the relations: 0.8<f/f1<1.8; 0<|f/f2|<0.8; 0<|f/f3|<0.
    Type: Application
    Filed: September 19, 2009
    Publication date: December 23, 2010
    Inventors: Chun-Shan Chen, Tsung-Han Tsai
  • Patent number: 7848032
    Abstract: This invention provides an imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface, both being aspheric; a fourth lens element with positive refractive power having a convex object-side surface, both its two surfaces being aspheric; and a stop disposed between the first and second lenses.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: December 7, 2010
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun Shan Chen, Tsung Han Tsai
  • Publication number: 20100284094
    Abstract: An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave image-side surface and an object-side surface cemented to an image-side surface of the first lens element; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a concave image-side surface and at least one inflection point; and an aperture stop located between an object to be photographed and the third lens element. In the optical lens system for taking image, the number of the lens elements with refractive power being limited to four. A focal length of the optical lens system for taking image is f, a focal length of the first lens element is f1, they satisfy the relation: 0.8<f/f1<2.1.
    Type: Application
    Filed: October 16, 2009
    Publication date: November 11, 2010
    Inventors: Chun-Shan CHEN, Tsung-Han Tsai
  • Publication number: 20100208359
    Abstract: The present invention provides an imaging optical lens assembly including, in order from the object side to the image side: a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and a second lens group comprising, in order from the object side to the image side: a second lens element with negative refractive power; a third lens element; and a fourth lens element; wherein focusing adjustment is performed by moving the first lens element along an optical axis, such that as a distance between the imaged object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far; and wherein the number of the lens elements with refractive power in the imaging optical lens assembly is N, and it satisfies t
    Type: Application
    Filed: June 12, 2009
    Publication date: August 19, 2010
    Applicant: LARGAN PRECISION CO., LTD.
    Inventors: Chun-Shan CHEN, Hsiang-Chi TANG
  • Patent number: 7777972
    Abstract: The present invention provides an imaging optical lens assembly including, in order from the object side to the image side: a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and a second lens group comprising, in order from the object side to the image side: a second lens element with negative refractive power; a third lens element; and a fourth lens element; wherein focusing adjustment is performed by moving the first lens element along an optical axis, such that as a distance between the imaged object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far; and wherein the number of the lens elements with refractive power in the imaging optical lens assembly is N, and it satisfies t
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: August 17, 2010
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun-Shan Chen, Hsiang-Chi Tang
  • Publication number: 20100149659
    Abstract: An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power has a convex object-side surface; a plastic second lens element with negative refractive power has a concave object-side surface and is provided with at least one aspheric surface; a plastic third lens element with negative refractive power has a concave object-side surface and is provided with at least one aspheric surface; a fourth lens element with positive refractive power has a concave image-side surface and is formed with inflection points; and an aperture stop is located between an object to be photographed and the second lens element. An on-axis distance between the first and second lens elements is T12, a focal length of the optical lens system for taking image is f, they satisfy the relation: (T12/f)*100>0.7.
    Type: Application
    Filed: January 10, 2009
    Publication date: June 17, 2010
    Inventors: Chun-Shan Chen, Hsiang-Chi Tang, Tsung-Han Tsai
  • Patent number: 7738186
    Abstract: An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave image-side surface and at least one aspheric surface; a meniscus third lens element with negative refractive power having a convex image-side surface; and a fourth lens element with negative refractive power having a convex object-side surface and an aspheric image-side surface. The above configurations and arrangements of the lens elements can effectively reduce the size of the optical system while improving its resolution.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: June 15, 2010
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun Shan Chen, Hsiang Chi Tang
  • Patent number: 7722517
    Abstract: A plastic bag sealing device includes a work table, a sealing device having a silicon rubber roller, a material intake press roller and a material outlet press roller fixed beside the silicon rubber roller to press thereon, plural rotating shafts fixed outside around the silicon rubber roller and respectively mounted with a sealing blade, plural guide rollers employed to conduct plastic bags, a dot-cutting device, an opening-cutting device, and a press roller fixed beside the dot-cutting device and the opening-cutting device. With the sealing blades to carry out multiple sealing at the same location, a plastic bag can be quickly and firmly sealed, and with the dot-cutting device and the opening-cutting device installed on the work table to respectively execute dot-cutting and opening-cutting, the work table can be comparatively downsized, thus greatly elevating economic gain.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: May 25, 2010
    Inventor: Chun-Shan Chen
  • Publication number: 20100118417
    Abstract: An optical system for taking image comprises three lens elements with refractive power, wherein a first lens element with positive refractive power includes at least one aspheric surface, a second lens element with negative refractive power, and a third lens element with negative refractive power includes at least one aspheric surface, which are mounted orderly from the object side to the image side. By such arrangements, the volume of the lens assembly can be reduced, and can obtain high resolution.
    Type: Application
    Filed: January 18, 2010
    Publication date: May 13, 2010
    Inventors: Chun-Shan Chen, Hsiang-Chi Tang, Yeo-Chih Huang, Sayuri Noda
  • Patent number: 7692877
    Abstract: An optical lens system for taking image comprises four lens elements from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, at least one of the object-side surface and the image-side surface of the second lens element being aspheric, inflection points being formed on the image-side surface of the second lens element; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with negative refractive power; and an aperture stop being located between the object side and the second lens element.
    Type: Grant
    Filed: August 2, 2008
    Date of Patent: April 6, 2010
    Assignee: Largan Precision Co., Ltd.
    Inventors: Hsiang Chi Tang, Chun Shan Chen
  • Patent number: 7679841
    Abstract: An optical system for taking image comprises three lens elements with refractive power, wherein a first lens element with positive refractive power includes at least one aspheric surface, a second lens element with negative refractive power, and a third lens element with negative refractive power includes at least one aspheric surface, which are mounted orderly from the object side to the image side. By such arrangements, the volume of the lens assembly can be reduced, and can obtain high resolution.
    Type: Grant
    Filed: November 13, 2006
    Date of Patent: March 16, 2010
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chun Shan Chen, Hsiang Chi Tang, Yeo Chih Huang, Sayuri Noda
  • Publication number: 20090251802
    Abstract: An optical system for taking image comprises three lens elements with refractive power, wherein a first lens element with positive refractive power includes at least one aspheric surface, a second lens element with negative refractive power, and a third lens element with negative refractive power includes at least one aspheric surface, which are mounted orderly from the object side to the image side. By such arrangements, the volume of the lens assembly can be reduced, and can obtain high resolution.
    Type: Application
    Filed: May 23, 2009
    Publication date: October 8, 2009
    Inventors: Chun-Shan CHEN, Hsiang-Chi Tang, Yeo-Chih Huang, Sayuri Noda
  • Publication number: 20090242683
    Abstract: An automatic fast winding machine includes a machine table, a support frame, a feeding tank, a rotary disk, plural guide rollers, a press roller, a saw-teeth cut device and a collect frame. A large roll of packing film is hung on the support frame. Packing film extends from the large roll, guided by the guide rollers pressed tightly by the press roller, and wound around a cylinder that falls down from the guide hole and supported on one of the support rods, and then the rotary disk turns for 90 degrees once to let the packing film cut by the saw-teeth cut device. Then the cylinder wound with packing film becomes a small roll of packing film to fall down along the collect frame and received and collected therein. All the operations are automatically performed by the machine with fast speed, enhancing production.
    Type: Application
    Filed: March 27, 2008
    Publication date: October 1, 2009
    Inventor: Chun-Shan CHEN
  • Publication number: 20090215601
    Abstract: A plastic bag sealing device includes a work table, a sealing device having a silicon rubber roller, a material intake press roller and a material outlet press roller fixed beside the silicon rubber roller to press thereon, plural rotating shafts fixed outside around the silicon rubber roller and respectively mounted with a sealing blade, plural guide rollers employed to conduct plastic bags, a dot-cutting device, an opening-cutting device, and a press roller fixed beside the dot-cutting device and the opening-cutting device. With the sealing blades to carry out multiple sealing at the same location, a plastic bag can be quickly and firmly sealed, and with the dot-cutting device and the opening-cutting device installed on the work table to respectively execute dot-cutting and opening-cutting, the work table can be comparatively downsized, thus greatly elevating economic gain.
    Type: Application
    Filed: February 25, 2008
    Publication date: August 27, 2009
    Inventor: Chun-Shan CHEN
  • Publication number: 20090207506
    Abstract: An optical lens system for taking image comprises four lens elements from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, at least one of the object-side surface and the image-side surface of the second lens element being aspheric, inflection points being formed on the image-side surface of the second lens element; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with negative refractive power; and an aperture stop being located between the object side and the second lens element.
    Type: Application
    Filed: August 2, 2008
    Publication date: August 20, 2009
    Inventors: Hsiang Chi TANG, Chun Shan Chen