Patents by Inventor Liao Chen Cheng

Liao Chen Cheng 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).

  • Optical system for laser riflescope
    Patent number: 7142374
    Abstract: An optical system for a laser riflescope includes, an objective lens group (1), an eyepiece lens element (3) defining an optical axis with the objective lens group, and an erector lens group (2) positioned between the objective lens group and the eyepiece lens element. The eyepiece lens element includes an aspheric element having a diffractive configuration (33). The aspheric element combines with a spherical lens so as to form a hybrid lens. Thus, the spherical aberration of the optical system is eliminated by the aspheric element and the chromatic aberration is eliminated by the diffractive configuration.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 28, 2006
    Assignee: Asia Optical Co., inc.
    Inventor: Liao Chen Cheng