Aspherical eyepiece

Details Aspherical eyepiece Aspherical eyepiece

1995-05-15

1996-10-22

Look, Edward K.

Optical: systems and elements

Lens

Eyepiece

359645, G02B 2500

Patent

active

055683193

ABSTRACT:
An aspherical eyepiece has a positive lens group and a correction plate positioned on the light incident side of the positive lens group and having an aspherical surface. The correction plate is positioned between the positive lens group and the front side focal plane of the positive lens group or in front of the front side focal plane of the positive lens group. Thus, although the eyepiece is constructed by a reduced number of optical members including an aspherical optical member, distortion can be favorably corrected even with a wide field angle.

REFERENCES:
patent: 2234716 (1941-03-01), Wood
patent: 3158677 (1964-11-01), Lacomme et al.
patent: 3788732 (1974-01-01), Shoemaker
patent: 3975088 (1976-08-01), Shoemaker
patent: 4650293 (1987-03-01), Kimura et al.
patent: 5162945 (1992-11-01), Matsuo et al.
Richard A. Buchroeder, "Distortionless Eyepiece", Applied Optics, vol. 27, No. 16, pp. 3327-3328.
B. L. Nefedov, "Eyepieces With an Imaginary Front Focal Plane and a Negative Collection Lens", Sov. J. Opt. Technol. 46(7), Jul. 1979, pp. 422-430.

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