Patents by Inventor Toyohiko Kashiwagi

Toyohiko Kashiwagi 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).

  • Aspherical lens, method of producing the lens and apparatus for producing the lens
    Patent number: 5191366
    Abstract: The present invention relates to an aspherical lens as a refracting and correcting means for an eye, such as an intraocular lens and a contact lens, a method of producing the lens, and an apparatus for producing the lens. According to the present invention, it is possible to produce a lens which entirely removes a spherical aberration by arbitrarily controlling the spherical aberration and has an arbitrary focal depth and resolving power.In the present invention, ray tracing is performed for an incident ray, a final passing point of the ray is compared with a preset desired final passing point, and a slope of a curved surface corresponding to the ray is determined so that both final passing points coincide with each other.Furthermore, the shape of a lens is found by determining surface slopes respectively corresponding to heights of rays with respect to the optical axis as described above.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: March 2, 1993
    Inventor: Toyohiko Kashiwagi