Fresnel lens and die for the same

Details Fresnel lens and die for the same Fresnel lens and die for the same

2005-11-08

2005-11-08

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Diffraction

From grating

C359S569000, C359S573000, C359S574000, C362S338000

Reexamination Certificate

active

06963450

ABSTRACT:
Provided is a Fresnel lens the manufacture of that is unlikely to be affected by the working errors of the die in the optical axis and its neighborhood. Two lens surfaces11, 11that are disposed in the vicinity of the optical axis are disposed in the way they are shifted from each other in a direction along the optical axis, whereby the height Ha in this direction of the optical axis of a non-lens surface12located at the boundary between the two lens surfaces11, 11is made greater than an original height Ha of the non-lens surface12in a case where it is assumed that the lower ends11a, 11aof each of these lens surfaces11, 11has been placed on the same flat plane intersecting the optical axis OA at a right angle with respect thereto. Also, the lens angle θa of at least one piece of lens surface21that is disposed in the vicinity of the optical axis is set to be greater than the original lens angle that should be given according to the focus calculation with respect to the lens angle21.

REFERENCES:
patent: 1500185 (1924-07-01), Gage
patent: 5121980 (1992-06-01), Cohen
patent: 5551042 (1996-08-01), Lea et al.
patent: 5581405 (1996-12-01), Meyers et al.
patent: 5806955 (1998-09-01), Parkyn, Jr. et al.
patent: 5969862 (1999-10-01), Maruyama
patent: 6252724 (2001-06-01), Scheer
patent: WO 9950596 (1999-10-01), None

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