SU1413575A1 - Microscope ocular lens - Google Patents

Abstract

FIELD: optical instrumentation; used in various optical devices. The purpose of the invention is to improve image quality by compensating for chromatism of magnification, astigmatism and chromatic coma. A collective lens 1 with a front confocal surface builds a real image of the object in the front focal plane of the ophthalmic lens 2 near the field diaphragm 3. Eye The lens 2 builds an image of the object at infinity. Both lenses are convex-flat. Lens thickness} is not less than 0.6 of the focal length of the ocular, the difference in refractive indices of lens materials is not less than 0.09. 1 il.

Description

Kg SF

WITH

Sl

-h1

SL

The invention relates to optical instrumentation and can be used in optical devices.

The aim of the invention is to improve image quality by compensating for chromatism of magnification, astigmatism and chromatic coma.

The drawing shows the principal optical scheme of the eye of the microscope.

The ocular p consists of two components successively along the beam: the collective 1 and the ocular 2, which are convex to the object plane, and the field diaphragm -. 3, near the front focus of the ocular F,

The ocul p works as follows.

The front focus of the entire ocular system F is located between components 1 and 2, which is a feature of Huygens-type oculars. The actual image of the object, given to the lenses, is in the front focus of the ocular and is imaginary for the collective component 1, which gives a real image of the imaginary object in the front focus F, eye

R,

(do 2

R3

n, -1

-)

P5 +

 t

where d, R is the thickness of the air gap between the lenses 1 and 2; the radius of the spherical surface of the lens 2; respectively indicators

refractive lenses 1 and 2; d d - lens thickness 1. The proposed ocular has a focal length of 25 mm, a field angle of 30 °.

In the reverse direction of the rays, the longitudinal spherical aberration dp of the main wavelength does not exceed 0.2 mm, the astigmatism is less than 0.1 mm, the chromatism of the increase is positive and reaches 1%.

Claims (1)

Invention Formula The microscope's eyepiece, containing a collective lens in the form of a convex-flat lens made of flint, a field diaphragm and an eye lens in the form of a convex-flat lens from a crown, characterized in that in order to improve image quality by compensating for chromatism magnification, astigmatism and chromatic coma first lenses 2, where the field lens of the collective lens is the cusp. 3. The eye of the lens gives an image of a confocal, the thickness of the collective of the object at infinity, the lens is at least 0.6 (the first surface of the collection distance of the ocular distance and difference of the active lens 1 is determined by the shape of the refractive indices of materials mulelinz not less than 0.09