Patents by Inventor Stig Berglund

Stig Berglund 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).

  • Patent number: 5730517
    Abstract: A projector which projects a flat picture or image in a horizintal plane onto a vertical screen. Because the projection optic used is arranged above one corner of a four cornered picture and can be rotated about a vertical axis the projector can be placed not only on one side of the projected picture, which is thus not obstructed by the projector and it's operator, but alternatively to the either side thereof. The picture can be square or rectangular. The invention can be applied both with overhead projectors and with TV type projectors.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: March 24, 1998
    Assignee: Optica Nova Onab AB
    Inventor: Stig Berglund
  • Patent number: 4988176
    Abstract: A projection lens comprises four coaxial, spherical surfaces with lenses (1-4 of which, in the direction from the object side (14) to the picture side (15), the first lens (1) has a convex surface facing the object side, the second lens (2) and the third lens (3) are located close together and spaced from the first lens (1) and the fourth lens (4), and the fourth lens (4) has a convex surface (41) facing the picture side. The surface (11) of the first lens (1) facing the picture side is planar. The surfaces (21, 31) of the second (2) and third (3) lenses facing the picture side are also planar. The surfaces (20, 30) of the second (2) and third (3) lenses facing the object side are concave. The surface (40) of the fourth lens (4) facing the object side is preferably slightly convex but may even be planar.
    Type: Grant
    Filed: August 30, 1989
    Date of Patent: January 29, 1991
    Assignee: Optica Nova Onab AB
    Inventor: Stig Berglund
  • Patent number: 4838686
    Abstract: Projector apparatus including a light source, a projection head and a projection stage aperture for an object, the image of which is to be produced. The aperture is situated in the ray path between the light source and the projection head. An ellipsoidal mirror is situated in the light path between the light source and the aperture. One focal point of the ellipsoidal mirror substantially coincides with the light source and the other focal point of the mirror substantially coincides with the projection head. The projection head includes a deflection means. The projection head is situated substantially in a plane constituting a normal plane to the aperture plane and containing the front edge line of the aperture, as observed in the generally horizontal projection direction.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: June 13, 1989
    Assignee: Optica Nova ONAB AB
    Inventor: Stig Berglund