SU1374168A1 - Catadioptric lens - Google Patents

Abstract

FIELD: optical instrumentation; Used in low-light recording devices. The purpose of the invention is to simplify the design and manufacturing technology of the lens. The device contains a correction element, performed in the form of an object facing a positive meniscus 1 with a thickness of 0.5-0.7 of the focal length of the lens. The light beam transmitted through the meniscus 1 is reflected from the primary concave spherical mirror 2 and passes through the central zone of the meniscus 1 to the secondary mirror 3 applied to its convex surface. Reflected from the mirror 2 3 the beam is collected in the focal plane of the lens. The longitudinal spherical lens objectivity does not exceed 0.0008 mm, the chromatism of the position Q is 0.0059 mm, the astigmatism is 0.053 mm, and the bottom-SS of the torsi is 0.017%. 1 il. (L

Description

with

four

O5 CX)

The invention relates to high-aperture mirror-lens lenses and can be used in various optical devices, including those recording low levels of illumination.

The aim of the invention is to simplify the design and manufacturing technology of the lens while maintaining the light chromaticism of the position of 0.0059 mm, measurement power and image quality. 0.005 mm diagonal curvature, sagit The drawing shows the optical scheme of the proposed lens.

Along the beam, a correction element is sequentially arranged in the form15 of a wide meridional beam of a non-positive meniscus 1, the primary one being more than 0.0093 mm. concave spherical mirror 2 and secondary mirror 3, applied to the central part of the convex meniscus surface, facing the object. 20

The lens works as follows.

The light beam, having passed through the positive meniscus, falls on a concave image in the center of the diffraction quality floor.

The field of view, lens with corrected line for the spectrum of 589.3 nm and achromatized in the spectral range of 486.1 - 656.3 nm.

The longitudinal spherical aberration of the lens does not exceed 0.0008 mm.

total curvature of 0.061 mm, astigmatism of 0.053 mm, distortion of 0.017%, chromatism of an increase of 0.051%, aberration

Claims (1)

Invention Formula A mirror-lens lens containing a correction element, a primary concave spherical mirror and a secondary mirror, corrective chromaticism of the position of 0.0059 mm applied to the central part of the surface, 0.005 mm meridional curvature, sagit wave image in the center of diffraction quality. The field of view, lens corrected for the line of the spectrum of 589.3 nm and achromatized in the spectral range of 486.1 - 656.3 nm. The longitudinal spherical aberration of the lens does not exceed 0.0008 mm. position chromaticity is 0.0059 mm, meridional curvature is 0.005 mm, sagitshirovy meridional beam is not more than 0.0093 mm. total curvature of 0.061 mm, astigmatism of 0.053 mm, distortion of 0.017%, chromatism of an increase of 0.051%, aberration wide meridional beam not more than 0,0093 mm. Invention Formula wide meridional beam not more than 0,0093 mm. A mirror-lens lens containing a correction element, a primary concave spherical mirror and a secondary mirror applied to the central part of the correction surface This spherical mirror 2, and, reflecting a 25-element, facing the object, differing topics from it, it passes through the central zone of the positive meniscus twice, in order to simplify construction 1 — before and after reflection. from the secondary and manufacturing technology, the correction mirror 3 and assembled into a focal element is completed in the form of a positive plane F. One of the variants of the lens with aperture ratio of 1: 0.8 and a focal length of 80 mm has in the visible range of lengths 30 tel meniscus, turned with a curved surface to the object, with a thickness of 0.5-0.7 of the focal length of the lens. meta different topics that, in order to simplify the design and manufacturing technology, the correction element is implemented in the form of  that, in order to simplify the design and manufacturing technology, the correction element is implemented as a positive 30 tel meniscus, turned with a curved surface to the object, with a thickness of 0.5-0.7 of the focal length of the lens.