SU1392533A1 - Reproduction objective - Google Patents

Description

(21) 4137966 / 24-10

(22) 10/24/86

(46) 04/30/88. Bul Number 16

(72) Yu. I. Sverchkov, S. V. Pozdnov

and A. A. Sergeev

(53) 771.351.6 (088.8)

(56) USSR Author's Certificate No. 970293, cl. G 02 B 11/34, 1981.

U.S. Patent No. 4,143,944, Cl. 350-214, publ. 1979

(54) REPRODUCTIVE OBJECTIVE

(57) The invention relates to optical instrument making and allows improving the image quality and the uniform distribution of illumination across its field. The negative lens component consists of a positive 1 and negative 2, 3 menisci formed by concavity to the image. In the positive component, in front of the positive lens, glued together from a two-convex lens 5 and a negative meniscus 6, a negative meniscus 4 is placed, facing its concavity towards the object. The aperture diaphragm is installed in front of the negative lens 8, 9, followed by the positive menisci 10, 11 and the two-fold lens 12. The lens is designed for imaging microfilming equipment. 3 il.

i

(L

with

 5 S 7 8 d Ш ff 12

with

CD ate

with

WITH

FIG. /

The invention relates to instrumentation, in particular to reproduction lenses, and can be used in reprographic instruments.

The purpose of the invention is to improve the image quality and uniform distribution of illumination across the image field.

FIG. Figure 1 shows the principal optical scheme of the reproduction lens; in fig. 2 shows the transmission function of the lens modulation for the center of the field of view; in fig. 3 - the same for the edge of the field of view.

The optical scheme of the lens contains a positive 1 and two negative 2 and 3 menisci facing in concavity to the image, a negative meniscus 4 facing in concavity to the object, a doublet glued together, consisting of a two-convex lens 5 and a negative meniscus 6, an aperture diaphragm 7, a glued doublet, states of a positive meniscus 8 and two covukes. sy lenses 9, two positive meniscus 10 and 11, facing the concavity to the object, and two-convex; Inza 12.

Lenses 1-3 form a negative component, the rest are positive.

The introduction of a negative meniscus 4, facing the concavity of the object, helps to correct aberrations of broad oblique beams in the meridional and sagittal sections, as well as a better correction of distression.

The lens is prednazhchennya for ed.emochny microfiche. 1) moving apnaratura working with an increase of 1/24. Lens has

ABOUT

30 6O 90 20 i50

at -25b

(Reg. 2

focal length 3 mm, relative aperture 1: 4, angular field of view 56 °, lens optics length 59 mm, optics diameter not more than 36 mm.

Item size 768 mm.

For the main wavelength (546-1 nm), the longitudinal spherical aberration does not exceed 0.026 mm, the chromatism of the position in the spectral range 520-580 nm does not exceed 0.0722 mm, the curvature of the image in the meridional plane is not more than 0.011 mm, in the sagittal one no more than 0.071 mm, astigmatism is not more than 0.0821 nm, distortion is not more than 0.3%, aberrations of a wide meridional beam do not exceed 0.0084 nm.

Claims (1)

Invention Formula 0 A reproduction lens containing a negative component of the vocative and two negative menisci facing inward to the image, and a positive component of a positive lens, glued together from a two-convex lens and a negative meniscus, an aperture diaphragm, a negative lens, a glued 5 from a positive meniscus and a two-concave lens, two positive menisci facing inward towards the object, and a two-convex lens, distinguish {instem that, in order to improve the image quality and uniformity of the illumination distribution over the image field, in the positive component in front the negative glued contact with the concavity of the object is fixed with a glued positive lens. 160 210 C mm - / before 60 120 150 Vua. 3 i80 210 D6 Mff -one