Protective film for a prism lens

Details Protective film for a prism lens Protective film for a prism lens

2005-09-27

2005-09-27

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

With reflector or additional screen

Reexamination Certificate

active

06950234

ABSTRACT:
A transparent synthetic resin protective film to be mounted on prisms (15) of a synthetic resin prism lens (14) where a light entering from the side face or the back face emerges from the prism forming face on the front side formed with ridge prisms (15) continuously. A rough surface (24) comprising micro protrusions and recesses for suppressing moire fringes, blur, glare, and inversion is provided at least to the protective film facing the prism (15). The top part of each protrusion (24a) constituting the rough surface (24) is a flat face substantially contained in a single plane (25) and having such a predetermined small extent not recognizable by naked eyes or a convex face of small curvature. The flat faces of the protrusions (24a) is continuous with the edges (15a) of the prisms (15) in any relative position of the protective film (20) and the prism lens (14) in the two-dimensional direction. Since the protrusions (24a) on the protective film (20) side slide smoothly on the prism (15) when the protective film (20) moves relatively to the prism lens (14), the conventional drawback that the edges (15a) of the prism (15) of the prism lens (14) is rubbed and worn by (the protrusions (24a) of) the rough surface (22) on the protective film (20) side is overcome.

REFERENCES:
patent: 3671101 (1972-06-01), Finch
patent: 5247390 (1993-09-01), Hed
patent: 5629784 (1997-05-01), Abileah et al.
patent: 5841572 (1998-11-01), Ando et al.
patent: 6700707 (2004-03-01), Kashima et al.
patent: 6771335 (2004-08-01), Kimura et al.
patent: 8-313708 (1996-11-01), None
patent: 11-174207 (1999-07-01), None
patent: 2000-284105 (2000-10-01), None
International Search Report, Nov. 14, 2000.

Affiliated with

Also associated with

Rating

Protective film for a prism lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protective film for a prism lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective film for a prism lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3419893