DE1945360U - PHOTOGRAPHIC LENS. - Google Patents

Description

RA, 3B3 71 e * 7/12/66 I /

.. -PATBNTANWÄITE DIPL. -X] STG. C. STOEPEL · DIPL. ING. W. 6OLLWITZEB 1ANBAÜ / PALATINATE AJtSCHfTZEmOI ¹

8 _β July 1966

Wild Heerbrugg Aktiengesellschaft Dr. Ludwig Bertele, Heerbrugg (Switzerland)

^ t ^ T ¹ ^ '*** »". ■ * «* ■" *** · fa * »** der Ab ^

"Photographic lens"

The innovation relates to a bright lens with a relatively small angle of view, even with longer focal lengths a great wealth of detail in To achieve image. This can be made possible by an extremely "far-reaching correction of the image errors, especially the spherical aberration for all heights of incidence of the imaging rays.

The objective comprises: in a known manner four lens members each ^; the lens face facing the object represents a simple converging lens, the second is a converging meniscus that is bent after the lens = too bent, t! The third lens element is a jnacb / dem Otrjeki;. "" - too bent simple lens with a diffusing refractive power and the fourth; .Linseiigiieä ^ wexiigs ^ ens from three 5-islands in such a way ^: put together --- is> j :: that two diffusing lenses are pure bikoiivexe Llns ^ em with higher

■ - 2 -

Include refractive index. The new thing is that the lens follows the conditions in their entirety is equivalent to:

a) dividing the sum of the thicknesses of the second and third lens elements and the enclosed air space through the opening number results in a value that is greater than - 0.10 F and less than 0.18 F.

b) the radius of curvature of the cement surface located in the last lens element and bent towards the image is greater than 0.16 F and less than 0.28 F.

c) is the third and destructive lens element a meniscus bent towards the object and the difference in the reciprocal values of the radii of curvature delimiting the second air space is greater than 0.50 F. and less than 1.20 F.

d) the refractive index forming the third lens element . '. The diffusing lens is between 1.65 and 1.76.

e) the quotient of the values for the first and last radius of curvature of the lens is within the limits of 0.60 and 1.25.

Known objectives with such a lens sequence generally result in a larger angle of view of about 40 °. However, if you limit yourself to a smaller one Angle of view and strives for an unusually favorable one

Course of the spherical aberration curve, so result opt for such a lens, especially with smaller ones Petzval sum, other dimensions. In contrast to one lens that has become known is thereby on the use dispensed with a type of glass, which is suitable for diverging lenses in long focal length lenses with regard to the chromatic correction is not suitable because this glass has a strong blue extension of the spectrum.

Studies have shown that it is possible to meet the requirements placed on such a lens will be largely complied with if the under a - e_. noted conditions are met at the same time.

The size of the angles of refraction at the after Object to bent putty surface in the fourth link makes it possible to dispense with cement. It is within the scope of the innovation if then the third The diffusing lens following the air space remains unsealed with the next following lenses and also through it an airspace is separated.

The innovation should then be based on the at -. lying drawing are explained in more detail. Show it:

1 shows a first embodiment of the new one Lens with an aperture of f / 1.8 and an angle of view of about 18 °,

Fig. 2 shows a second embodiment of the innovation according to the invention Lens with an aperture of 1: 1.8 and, an angle of view of about ± 8 °. · ■ ■

In FIG. 1, the lenses are designated rait L. to Lg. The thicknesses of the individual lenses correspond to the reference symbols d 1 to dg. The individual lenses have radii of curvature v. until r _1Q . The air spaces between the individual lenses are shown with X ₁ , ^ ₂ , ^ x. The lenses Lu, Lp-, Lg are combined into one lens. \ The lens L ₂ consists of a simple lens. ; :

In FIG. 2, the lenses are ^{denoted by L. 1} to Lg 'and -. ".; ■ L _7. The thicknesses of the individual lenses correspond to the reference characters d.,' To dg * and d". The individual LIn- sen have radii of curvature r ^ ^f to r ₁₀ ^f and r ,, Anf. The air spaces between the individual lenses are shown with Jl ·, & ', JL ^ . In this second embodiment, in contrast to the first example, the second lens element, from two lenses L 'and L, ¹ cemented together. The lenses. "■ _.' L ₁ - ¹ , Lg ·, L ₇ are combined into a single lens.

In both exemplary embodiments, the greatest deviation of the spherical longitudinal aberration from the -V Gaussian image plane is only -0.9 ^ of the focal length, the aperture number is 1.8, so-called long flint glasses have not been used. _Λ

The following values result for the individual conditions: -... ", ./ _: -""■": .-

example 1 _: Example 2

^a > ^d 2 ^{+ d} 3 * ^ 2 = - '0.118 F, d _o + d, + d _{i (} + A = 0.118 F

Opening number ^& '' ößL

b) / -0, l6 F / ^ 0.2136 F / 0.28 F b) -0, l6 F / »0.2136 F ^ ci _? 28 F.

c) 0 _r 50 P / O, 852l · F- / 1.20 P e) 0.50 ^ 0.9537. ^ 1.20 E.-;

d) 1.65. OvT1749'- '/ 1V76; ^J "d) 1.65 / 1.68893

e) 0.60 <0.896 ^ 1.25 e) Ο, βΌ / 0.907

The optical data of the two examples now follow
in the. Focal length = 1. It means:

the Abbe's number
n _{d are} the refractive indices for the d-line of the spectrum

~ the refractive power of the respective lens surface.

example 1

opening ratio 1: 1.8

n _d V

P ₁ = "+ 0.72 ⁴ F + 0.838 / 5, +0,; 20 / _F

Cl ₁ "= 0.0706'F 1.6031 65.6 '; -

\ - o, oo2 * fy,. /; ■

r ₃ = "+ O, 3782 ^# F + l, 996 / _p: + 0.20 / ^,

L ₂ d ₂ = 'O, 1275 * F 1.75496 53.4;

r ₄ = '+ O ₉ 6996'F -l, O79 / _F +0.,

& ₂ = '0.0456'F

L ₃ -d ₃ s'O, O395 "P 1.71749 29.55

r ₆ = + 0.2355-F -3 ^^^

L · - 0.2194 "F: i- ■■■■

V ₁ = "+ 12.6l * P +0.046 / ^^ 0.257 ^

L ₄ d ₄ = 0,0222'F 1.57492 41.5; v _::: /

r ₈ = + 0.5492'F + 0.202 / _p + 0 ^ 257 ^

L ₅ d ₅ = 0.1242'F 1.68609 53.5 '-' .. ' _: \ - ■■ -

V ₉ = -0.2136-F + 0.308 / _F + 0.20 / _p

L ₆ ; d ₆ = 0.0315 ^# F 1.62039 60.35. ; ^; ; V ''

V ₁₀ - - 0.8032'F. ■ - "':" + 0.772 / _f; * O _s 20 / _f

Distance r ₁₀ to image = 0.501 F ~ ;; :. :

Example 2
opening ratio 1: 1.8

ⁿ *

rj - + 0.7431'F. +0.1

L ₁ ^{1 d} li "Ό» Ο7Ο6 * Ρ 1.61720 54.04

r ₂ »= CX ^ +0.0 + 0.25 / _F

^ '= * Q, 002'F ■; -: ■ :.

r ₃ »="'+ 0.3768 "P + 1.975 / j, ^ 0.20 / ^

L ₂ '-dg ¹ -'0.1073'F 1.74400 44.9 v _:

r ₄ »= 'Oo 4-0.0 + 0.30 / _F

L ₃ ' ^d 3 ^{! = O} » ^O2O2 ' ^F !» 72151 29.28

V ₅ = '+ Ο, 6754 · Ρ -l, O68 / _p + 0.20 / _F

. -2 ⁼ 0.0456 * F
r ₆ "= + 1.898-F '+ 0.363 / _F + 0.30 / ^

L ₄ 'd ₄ ' = 0.0395 ^# F 1.68893 31.15

r ₇ »= + 0.2348-F -2.934 / _F + 0.40 / _F

X »= 0.2193'F
r ₈ »= + 13.83'F + 0.22 / _F + 0.25 / j,

L ₅ ' ^d 5 ^f = ° » ^O222 ' ^P 1 * 57492 41.5

^ ₉ '= + O, 5524 ^# F. + 0,201 ^ + 0.25 / 5,

Lg '.dg »= Q, 1242 * F 1.68609 53.5

r ₁₀ '= - 0.2136 * F .-- "-_.- ■" + 0.308 / j, + 0.20 / _F

L ₇ d ₇ O, O298 ^e F 1.62039 60.35

V ₁₁ = - 0.8193 ^# F,. + 0.757 / _F ; i0.20 / _F

Distance T ₁₁ to image = '0.501 ρ. .

Claims (4)

- 7 S. chu't-z claims 1. Bright lens with a small angle of view, consisting of four airspace-separated lens elements, of which the lens element facing the object is a simple converging lens, the second is a converging meniscus that is bent after the first lens, and the third, diffusing lens element, the more strongly curved surface faces the image and the fourth lens element is combined of at least three lenses and specifically such that two diverging lenses include a convex lens having a higher refractive index, characterized ge * ^-: indicates that the lens corresponds to the following conditions in its entirety: a) the sum of the thicknesses of the second and third lens elements and the enclosed air space divided by the number of openings results in a value that is greater than 0.10 B ¹ and less than 0.18 F. : ί b) the radius of curvature in the last lens element and after the picture too bent putty surface is bigger than 0.16 F and less than 0.28 F. c) the third divergent lens element is a post-object lens to bent miniscus and the difference in the reciprocal values of the radii of curvature delimiting the second air space is greater than 0.50 F and less than 1.20 F. d) the refractive index of the divergent lens forming the third lens element is between 1.65 and 1.76. e) the quotient of the values for the first and last radius of curvature of the objective lies within the limits of 0.60 and 1.25. .- ■ ''.'■''' ■ '- 2. Lens according to claim 1, characterized by the ^ training of the second lens element as a cemented element. 3. Lens according to claim 1 with the following data: ⁿ d ^v Au P ₁ = + Ο.72 · Ρ + 0.838 / _p +0 ,; L ₁ '"Cl ₁ ='0.0706" P 1.6031 65.6 ^r 2 ^{= 0} ^ ± 0.0 + 0.25 / Z ₁ = "0.002'P V ₃ = '+; 0.3782-p + 1.996 / _p + 0.25 / _p ^L 2. . d ₂ = 'O, 1275 ^# P 1.75496 53.4 r ₄ = + 0.6996.-F- -1.079 / p- ± 0.20 / _p 1.733'P + 0.4lÜ / _p ± Ö, 30 / _p d ₃ = "O, O395'P 1.71749 29.55 = O, 2194 ^# P + 0.26 / _p + _{0.25 / p} = 0.0222'F 1.57492 41.5 + 0.202 / _p + ρ? = '0.1242'P 1.68609 53.5 + 0.38 / _p + B _t ^L 6 ^d 6 -, = 0.0315 'F 1.62039 60.35 P ₁₀ = -0.8032-F + O.772 / _p ± 0.20 / _p ^r 7 = +12, 6l * P • F ^L 4 ^r 8 = + 0, 5492 • F ^L 5 ^r 9 = - 0, 2136 _ 9 4. Lens according to claim 1 with the following data: η, η ο Δ η 0.7431-F + O _s 831 / _p +0 ₅ 20 / _ρ (I ₁ '= Ο, Ο7Οβ · Ρ 1.61720 5 ^, 04 ± 0.0 +0 ₁ = ο, οο2 ρ
= + 0.3768-F + 1.975 / p ± 0 _ρ <V = O _S 1073 * P 1.74400 44.9 ^{f = 0} ^ ± 0.0 ± 0.30 / _p dj «= 0.0202'P 1.72151 29.28
»= + 0.6754-F -1.068 / p ± 0.20 / _F Λ2 '= O, O456 * P = + 1.898 * Ρ + 0.363 / _F ± 0.30 / _F * P 1.68893 31.15 -2.934 / _F ± 0.40 / _F r ₈ ^{f =>} 13.83'P + O, O42 / _p + 0/25 / p ^L ₅ ' ^d 5 ^! = '° »° 222'F 1.57492 4l, 5 r ₉ ^f = ■ + Ο, 5524 · Ρ + 0,201 / _p ± O, 257 _F : ^L 6 ^! . dg »a '0.1242'P 1.68609 53.5 ^d 7 ⁼ ° i ^O2 9 ^{8 # p} 1.62039 60.35 -0.757 / p- ± 0.20 / _p