DD222426B5 - Optical system - Google Patents

Description

Radii refractive indices thicknesses and distances

T ₁ = -43.5 п., = 1

r ₂ = + 56.2 n ₂ = 1.531870 O ₁ = 2.0

r ₃ = -16.4 n ₃ = 1.55440 d ₂ = 6.0

r ₄ = + 55.7 n ₄ = 1 I ₁ = 0.1

r ₅ = +23.9 n ₅ = 1.694160 d ₃ = 2.0

r ₆ = -33.5 n ₆ = 1.47586 d ₄ = 6.0

X ₁ = + 48.0 n ₇ = 1 I ₂ = 38.4

r ₈ = +21.0 n ₈ = 1.531870 d ₅ = 3.5

r ₉ = -21.0 n ₉ = 1.47586 d ₆ = 10.0

r ₁₀ = -104.6 n ₁₀ = 1.531870 d ₇ = 3.5

T ₁₁ = +15.1 n _{11 =} 1 I ₃ = 93.6

r ₁₂ = -51.7 n ₁₂ = 1.727940 d ₈ = 3.73

r ₁₃ = + 20.4 n ₁₃ = 1.531870 d ₉ = 1.4

r ₁₄ = -30.8 n ₁₄ = 1 I ₄ = 2.0

r ₁₅ = + 28.8 n ₁₅ = 1.734438 d ₁₀ = 1.86

n ₁₆ = 1

For this 1 page drawing

Field of application of the invention

The invention can be used in imaging high-performance systems in the wavelength range 150 to <10,000 nm.

Characteristic of the known technical solutions

Known technical solutions for optical imaging high performance systems based on the use of optical glass and individual, selected single crystals such. The use of optical glass has its limitation in limiting the transmission to the wavelength range of about 380 to 1500 nm and the small deviations of the relative partial dispersion of the normal line, whereby the correction of the secondary spectrum is limited.

The commonly used single crystals have transmissions that allow the modeling of optical systems even in more extreme spectral ranges (UV, IR). The deviation from the normal line of relative partial dispersion is generally higher than that of optical glasses. The difficulty is to find partner glasses that sufficiently allow the correction of the secondary spectrum and other aberrations.

As a result, a large number of lenses are needed in optical systems. There are also problems in the processing technology of crystals.

Object of the invention

The aim of the invention is an optical system which eliminates the disadvantages of the known prior art.

Explanation of the essence of the invention

The invention has for its object to provide an optical system in which the same or reduced lens number compared to optical glass, the secondary spectrum is corrected depending on the application over a wide spectral range. This object is achieved by an optical system according to the invention in that barium fluoride BaF _{2 is} used as monocrystalline optical medium.

In conjunction with other optical glasses, the secondary spectrum can be additionally corrected by the use of BaF ₂ to the deep UV compared to optical glass of the same or reduced number of lenses. In this case, it is easier to find favorable partner glasses with respect to the optical characteristics and a comparable to the fluorspar

Apply processing technology. The correction of the secondary spectrum according to the invention extends over a wavelength range of 150 to 2,000 mm, depending on the intended use.

The characteristic values of a solution according to the invention are given in Table 1.

embodiment

The essence of the invention will be explained in more detail with reference to a Feinmeßobjektives 0.3 / 20 shown in the drawing, the schematic structure of Fig, I shows.

Along the optical axis 0-0, lenses L 1 ... L 10 are arranged in four cement groups and as a single biconcave lens. The individual lenses are d by their center thickness _; , their radii η and the refractive indices n, while the required air distances are denoted by Ij. By using BaF ₂ as the optical medium for lens L 4 and L 6, a planapochromate for the wavelength range of 480 to 800 nm can be calculated, with the secondary spectrum being almost zero over the entire range.

A hitherto known solution was a plan achromate of the same number of lenses and magnification, which was corrected in the wavelength range from 480 to 643.87 nm, the secondary spectrum was 2.8 λ / Α ² .

Table 1

S = -13.691 -43.5 nm BK 7 - and 56 mm = 1 BaK4 glass path 2.0 S '= 144.62 with 39 = + 56.2 = 1.531870 6.0 = ep  χ. = -16.4 = 1.55440 0.1 radius = +55.7 Refractive index n _e = 1 distance 2.0 r. = +23.9 "ι = 1.694160 6.0 ^r 2 = -33.5 n ₂ = 1.47586 bi = 38.4 = +48.0 ⁿ 3 = 1 d ₂ = 3.5 U = +21.0 n ₄ = 1.531870 I ₁ = 10.0 r ₅ = -21,0 n ₅ = 1.47586 d ₃ = 3.5 ^r 6 = -104.6 "б = 1.531870 d ₄ = 93.6 ₇ = +15.1 n ₇ = 1, I ₂ = 3.73 ₈ = -51.7 "8th = 1.727940 d ₅ = 1.4 ^r 9 = +20.4 n ₉ = 1.531870 d ₆ = 2.0 r " = -30.8 ⁿ io = 1 d ₇ = 1.86 Гц = +28.8 1.1 = 1.734438 I ₃ = Γΐ2 n ₁₂ = 1 d ₈ = "13 d ₉ = "14 I ₄ = Гі5 dio- n "

Claims (2)

1. An optical system in which optical glasses and single crystals are used as optical media, characterized in that BaF 2 is used as the single-crystal medium. 2. Optical system according to claim 1, characterized by the following design data: cutting width: s = -13.691 s' = 144.62 with 39 mm BK7 and 56 mm BaK4 glass path entrance pupil Ep = χ