DE3117359A1 - Attachment system for a camera lens - Google Patents

Description

EQMIG Electricity and. ^: . ^ _- ' ^: ' - ,,} ' ^: .Λ .1? ⁰⁷² / ^be

Metal goods industry

society with limited

Liability ■ "April 30, 1981

Eurnigstrasse 2-8

A-2351 Wiener Neudorf

"Attachment system for a photo lens"

The invention relates to an attachment system for a taking lens, for use in air and / or in water, consisting of a negative member facing the object and one facing the taking lens positive link, with water optionally penetrating between the attachment system and the taking lens when it is used.

From the German Auslegeschrift 10 45 682 an attachment system for shortening the focal length of a riding angle lens has become known, that of two menisci convexly curved towards the object side, which enclose an air lens between them, and from one of these through there is a larger air gap between the collecting meniscus, v / elcher is designed as a putty member, became known. But AT-PS 334.108 also describes an attachment system that is similar to the The attachment system according to the invention is constructed, namely from a negative and a positive member, each with planar outer surfaces.

In the literature "Proceedings of the SPIE, Vol. 7, Oct. 1966, C-XIII ¹¹ and" Journal of the SMPTE, Vol. 69, April 1960, pg. 264-266 "by Rebikoff and Ivanoff, an underwater wide-angle attachment is described, which is placed in front of a fixed-focal photographic lens, which is supposed to compensate for the loss of expansion of the object field caused by a transfer of air in the wall. This known attachment is such

Qi ι 7 Ί ζ ο • ■ * - --- ^ V * "" "'■ · ■ ·: ·

create that the medium in the object space is water, in the space between Vor ^ and taking lens is air. The combination of the front lens and the photo lens is only intended for taking pictures under water and only anastigmatic for light beams inclined slightly to the optical axis corrected.

The invention is based on the object of creating an afocal wide-angle attachment for a taking lens, whereby objects located in air as well as in water are imaged in a sharp, flat and high-contrast manner. When used under water, a correction state comparable to that of conventional attachment systems for underwater cameras should be achieved both in the case of a flooded space and in the case of a sealed space between the attachment and the taking lens. This is achieved in that the outer surfaces, as is known per se, the outer surfaces of the attachment system are essentially flat and the negative member is made up of two negative individual lenses, and that the absolute value of the sum of the surface powers of the through the concave surface of the first negative lens and the air flow in the negative member formed by the convex surface of the second negative lens is smaller than the absolute value of half the sum of all surface powers of the negative member. The surface of the front element facing the object and the surface of the positive refractive element facing the taking lens are preferably planar or only slightly curved. If the outer surfaces of the attachment are exactly flat, it is strictly afocal, regardless of the refractive index of the medium surrounding it in the lens space or in the space between the attachment and the taking lens, since the axially parallel bundles of rays that hit the outer surfaces perpendicularly and run parallel to the axis do not refract on the flat surfaces suffer. Furthermore ar. the flat or only slightly curved outer surfaces when immersed from one medium into another no change in the -i-.tigmaticche ¹ "

COPY

3117353

Image errors on. So was the field curvature for the image of a If the object is in the air, the image field remains flat even when changing into another medium, if the outer surfaces of the attachment are only flat or only slightly curved. In the case of strong curvatures of the outer surfaces, on the other hand, a clear change is made when the medium is changed Noticeable curvature of field.

An optimal elimination of all aberrations over the entire image field, independent of the medium surrounding the attachment, can be achieved. if the above-mentioned condition between the surface powers is met:

g ' ²

Further advantages and features of the invention emerge from the description of the three shown in FIGS Embodiments of wide-angle attachments according to the invention.

The attachment system shown in FIG. 1 consists of the object-side front element 1, which is made up of the two negatively refractive individual lenses L ₁ and L. L is designed as a planoconcave lens or as a negative meniscus with an only very weakly curved positive refractive surface, the planar or weakly curved surface facing the object. Although the level of the refractive index of the lens L _{1 has} little influence on the image quality of the system and the use of media with refractive indices around η = 1.5 also eliminates the image errors, the lens L .. should only be made of optical glass and not made of plastic, as the latter does not have the necessary resistance to use in air and water. The lens L "

COPY

Link 1 can occasionally be made of plastic werrton, wodurc ' a relatively simple way of aspherical deformation of a of the two surfaces is given.

The positively refractive element adjacent to the taking lens is constructed according to FIG. 1 from two positively refractive individual lenses L_ and L., which each turn their more curved surfaces towards the link 1. Here, too, what has been said for member 1 applies, that in some cases the water Exposed lens L only made of optical glass, the inner lens L however, can be made of plastic. A possible aspherical deformation is also a suitable one in the positive refractive link 2 Area provided. Execution data for this system shown in FIG. 1 can be found in subclaims 2 to 6.

In Fig. 2 the positive refractive member 2 ^{1 is designed} as cemented achromatic, such that an almost equilateral biconvex element L 'faces the front member 1' and an almost plano-concave element L 'faces the taking lens. Data for such an embodiment are given in dependent claim 7.

Finally, FIG. 3 shows an embodiment of the invention Attachment system in which the lens L "and the lens L" are not cemented to one another, so that an additional one in a known manner Parameters for the elimination of the image defects is obtained. Data for such an embodiment are given in subclaims 8 and 9. In the context of the invention, it is also possible to design the positive member 2 as a simple planoconvex lens, for example the curved Side facing the link 1 of the attachment system. Relevant data are the Referring to dependent claim 10. Execution dates for ei ~ Pancratic taking lens indicated how it works for the interaction is possible with the intent according to the invention.

BATH ORIGfNAL "

Recording object active;

119.2

33.44

44 _f 69
- 231.74
29.51

d, =

1, =

d "=

1 =

d "=

r, - 1714.61
6th

1. =

r _? - 1170.38
r ₈ 13.21
r _g - 38.52
r ₁₀ 14.70
r _{± 1} 45.63

d, =

1. =

d. =

d "=

1.805 / 25.4 1.620 / 60.3 1.720 / 50.4

16.58

11.66

2.87

33.64
- 186.74

d, = 2.2 /

"1 -

r ₁₄ 16.52
r ₁₅ - 168.08
r ₁₆ 13.07
TC ₁₁ 27.08
r ₁₈ - 24.67

d =

1_ =

α _Λ ⁼

1 "=

r ₁₉ 12.43

10 1- =

- 913.86

- 12.64

"11 ¹ IO =

^r 22 ¹³ ' ^7S
r 23 ³⁷ ' ⁹ °

'12

1.713 /

1.717 /

53.8

61.3 25.4

64.2

60.3

47.0

1.847 / 23.8

53.8

48.0

COPY

Taking lens; 1.2 / 3 - 27 in air

12 - 36 in water

Photo lens with WW attachment: 1 ^ 2/6 - 16.6 in air

8 - 22.5 in water

The claims that the intent according to the invention to remedy the Image errors are set, are much higher than with conventionally known attachment systems, since the image is both in air and in water the entire focal length range is to take place when using a pancratic recording lens.

copy

Claims (1)

Patent Attorney -Sng. i £ / s! * er,! acWsc ^ 311735 EUMIG Electricity and ·:. "":: ":;" * - & 37 072 / be metal goods industry "* _" * limited liability company 10. "4.10131 Eumigstrasse 2-8 A-2351 Wiener Neudorf patent claims 1. Attachment system for a taking lens for use in air and / or in water, consisting of a negative member facing the object and a positive member facing the taking lens, the space between the ancillary system and the taking lens can optionally be flooded, characterized in that how known per se, the outer surface of the attachment system are essentially flat and the negative member (l _f l ¹ , l ") is made up of two negative individual lenses (L, L), and that the absolute value of the sum of the surface powers of the concave Area of the first negative lens (L) and the air lens formed by the convex surface of the second negative lens (L) in the negative member is smaller than the absolute value of half the sum of all surface powers of the negative member (1, 1 ', 1 "). 2. Attachment system according to claim 1, characterized by the following data, understood with a deviation df> r curvature o.irr / .rinr-r surfaces and the thicknesses up to - 10 % of the refractive power of the corresponding member, the refractive indices up to - 0, 03 and the abbe ¹ see numbers up to - 5: ⁿ d ^v d r plan L d = 3.0 / 1.517 / 64.2 r 33.159 1 = 5.0
r 61.27 L ₂ ^J d ₂ = 5.0 / 1.492 / 54.7 r aspherical I ₂ = 28.53 r aspherical L d = 5.0 / 1.492 / 54.7 r. - 2041.56 ⁶ 1, = 0.1
r 153.284 L ₄ d ₄ = 3.0 / 1.517 / 64.2 r _g plan 1 = 4.5 distance to the recording lens Reproduction scale: ß ¹ = 0.63 where for by the formula cy ² 1 + 1 1 - (K + 1) c y (K + 1) c y defined asphere, in which formula χ the one related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and c corresponds to the reciprocal value of the radius R, the following data apply: ^{R a} 4 ^a 6 ^a 8 ^a l0. ^K r ₄ 59.82 - 0.2218E-O5 - 0.55OOE-O8 0.380OE-II.0 O.75OOE + OO r 74.472 0 0 0 0 - 0.4000E + 00 3. Attachment system according to claim 1, characterized by the following data, understood with a deviation of the curvature of individual surfaces and the thicknesses up to - 10% of the refractive power of the corresponding member, the refractive indices up to - 0.03 and the Abbe ¹ see numbers up to - 5: ⁿ d ^v d r 500.0
L d = 3.0 / 1.517 / 64.2 r 33.159 1 = 5.0 r 61.27
L ₂ d ₂ = 5.0 / 1.492 / 54.7 r, aspherical 1 ₂ = 27.42
r aspherical L. do = 5.0 / 1.492 / 54.7 r_ - 2041.57 1 ₃ = 0.1
r 153.284 L- d = 3.0 / 1.517 / 64.2 r _g 1608.1 1 = 4.5 distance to the recording lens Image scale: ß ¹ = 0.63
being for by the formula cy ² , 4 ^ 6 ^ 8 _, _ 10 - r =. + a y + a y + a y + a y 1 ₊ Vl- (K ₊ I) c2y ^ ¹ 4 6 8 10 defined asphere, in which formula χ the one related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and c corresponds to the reciprocal value of the radius R, the following data apply: ^{R a} 4 ^a 6 ^a 8 ^a l0 ^K r ₄ 59.82-0.2218E-O5-0.55OOE-08 0.380OE-II 0, 75ΟΟΞ + ΟΟ r 74.472 0 0 0 0 -0.4000E ₊ OO 4. Attachment system according to claim 1, characterized by the following Ώζ ¹ ·? - understood with a deviation of the curvature of individual surfaces and the thicknesses up to - 10% of the refractive power of the corresponding member, the refractive indices up to ~ 0.03 and the Abbe ¹ see Numbers up to - 5: η, ν, d d r - 500.0 L ₁ d = 3.0 / 1.517 / 64.2 ¹ r 33,159 ^X 1 ₁ = 5.0
r, 61.27 L ₂ ^J d ₂ = 5.0 / 1.492 / 54.7 r. aspherical 1 ₂ = 29.28
r _r aspherical L ^J d = 5.0 / 1.492 / 54.7 r. - 2041.56 ⁶ - i, = o, i r 153.284 L 'd = 3.0 / 1.517 / 64.2 r - 1608.1 1 = 4.5 distance to the recording lens Image scale: ß ¹ = 0.63
being for by the formula 4 6, 8, 10 defined asphere, in which formula χ the-related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and c corresponds to the reciprocal value of the radius R, the following data apply: ^{R a} 4 ^a 6 ^a 8 ^a l0 ^K r 59.82-0.2218E-05-0.55OOE-08 0.380OE-II.0.0.75OOE + 00 r 74.472 0 0 0 0 - 0.4000E + 00 5. Attachment system according to claim 1, characterized by the following data, understood with a deviation of the curvature of individual surfaces and the thicknesses up to -10% of the refractive power of the corresponding member, the refractive indices up to -0.03 and the Abbe ¹ see numbers up to - 5: _ 5 - · ⁿ d ^V d r 250.0
L d = 3.0 / 1.517 '/ 64.2 r 33.159 I ₁ = 5.0 r 61.27
L ₂ d ₂ = 5.0 / 1.492 / 54.7 3117 3 5 r aspherical = 28.448 r aspherical L α = 5.0 / 1.492 / 54.7 r - 2041.56 • ⁶ ι = ο, ι r 153.284 L d = 3.0 / 1.517 / 64.2 T 590.0 I ₄ = 4.5 distance to the recording. lens Image scale: ß ¹ = 0.63
being for by the formula cy ² . 4, 6, 8 10 x = - = Ti ^{+ a} a ^{v + a} fi ^{v + a} R ^{v + a} in ^Y 1 + Vl- (K ₊ I) cV 4 6 8 10 defined asphere, in which formula χ the one related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and, c corresponds to the reciprocal value of the radius R, the following data apply: • ^{R a} 4 ^a 6 ^a 8 ³ IO ^K r 59.82-0.2218E-05-0.55OOE-08 0.380OE-II.0.0.75OOE + CO r 74.472 0 0 0 0 -0.400CE + 00 6. attachment system according to claim 1, characterized by the following Data, understood with a deviation of the curvature individual ·· bleach unc of thicknesses up to - 10% of the refractive power the corresponding GLicdo ::. · -! ·> ' Refractive indices up to - 0.03 and the Abbe's numbers up to - 5: BAD QRIGIMä! COPY r - 250.0
L d = 3.0 / 1.517 / 64.2 r 33.159 1 = 5.0 r 61.27
L ₂ ^J d ₂ = 5.0 / 1.492 / 54.7 r aspherical 1 ₂ = 17.898 r aspherical L d = 5.0 / 1.492 / 54.7 r, - 2041.56 1 ₃ = 0.1
r 109.789 L d = 3.0 / 1.517 / 64.2 r _{8 to} 590.0 1. = 4.5 distance to the recording lens Reproduction scale: ß ¹ = 0.63 where for by the formula CV 4 6 8 x = - == - + ay + ay + ay + ay iy 1 - (K + 1) cV 4 6 8 defined asphere, in which formula χ the one related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and c corresponds to the reciprocal value of the radius R, the following data apply: ^a 6 ^a 8 ³ OK ^K r ₄ 59.82 - 0.2218E-O5 - 0.55OOE-O8 0.380OE-II 0 O, 7500E + 0O r 74.472 0 0 0 0 -0.4000E + 00 7. attachment system according to claim 1, characterized by the following Data, understood with a deviation of the curvature of individual surfaces and the thicknesses up to - "10% of the refractive power of the corresponding link, the refractive indices up to - 0.03 and the Abbe ¹ see numbers up to - 5: Copy 311735- ⁿ d ^v d r plan L a = 3.3 / 1.517 / 64.2 r 39.26 1 = 6.0
r 84.66 L ₂ . <3 ₂ = 4.0 / 1.492 / 54.7 r. aspherical I ₂ = 34.04
r aspherical
L a = 11.4 / 1.562 / 35.0 r - 32.03 L ₄ x a ₄ = 2.38 / 1.673 / 32.2 r plan I. = 4.5 distance to the recording. lens Image scale: ß ¹ - = 0.63
being for by the formula cy ² , 4, 6, 8, 10 7 ^{vvv Y v v v loY} defined asphere, in which formula χ the one related to a reference plane Deflection of the asphere at the respective distance y from the optical axis and c corresponds to the reciprocal value of the radius R, the following data apply: ^{R a} 4 ^a 6 ^a 8 ³ IO ^K r 62.24-O, 17OOE-O5-O, 2OOOE-O8 0 0 O, 3OOOE-5-O r ₅ 43.44 0 0 0 0 0.330OEJ-O 8. Attachment system according to claim 1, characterized by the following data, understood with a deviation of the curvature of individual surfaces and the thicknesses up to -10% of the refractive power of the corresponding member, the refractive indices up to -0.03 and the Ab.be ¹ see numbers up to - 5: r .. plan L d = 3.3 / 1.658 / 50.9 r 135.42 1 = 6.0
r 205.95 L d = 4.0 / 1.658 / 50.9 ^Δ r ₄ 53.07 1 = 33.7
r 59.01 L d = 11.44 / 1.617 / 53.9 r - 48.64 1, = 2.0
r - 43.68
L ₄ d ₄ = 2.38 / 1.620 / 36.4 plan 1 = 4.5 distance to the recording lens Image scale: ß ¹ = 0.63 .9. Attachment system according to Claim 1, characterized by the following data, understood as a deviation in the curvature of individual surfaces and the thicknesses up to - 10% of the refractive power of the corresponding link, the refractive indices up to - 0.03 and the disregarded numbers up to - 5: ⁿ d ^v d r. plan L d = 3.3 / 1.517 / 64.2 r 68.18 I ₁ = 6.0
r 425.12 L d = 4.0 / 1.517 / 64.2 r ₄ 70.93 1 = 33.7
r 56.80 L d = 11.44 / 1.607 / 49.4 r - 46.40 ⁶ I ₃ - 2.0 r - 41.09
L, d, = 2.38 / 1.620 / 36.4 r _g plan Figure scale; β ¹ = 0.63 1 = 4.5 distance to the recording lens Copy .. .. _ 311735 '.- 10. Attachment system according to claim 1, characterized by f , - τ- 1 data, understood with a deviation of the curvature of individual surfaces and the thicknesses up to - 10% of the refractive power of the corresponding member, the refractive indices up to - 0.03 and the Abbe 'see numbers up to - 5: "d ^V d r plan L d = 3.3 / 1.517 / 64.2 r 65,594 1 = 6.0
r 156.68 L · ■ d = 4.0 · / 1.517 / 64.2 r 68.45 , 1 = 33.7 r 69.64 L ₃ d ₃ = 11.44 / 1.607 / 49.4 r plan 1 = 4.5 distance to the recording lens Image scale: ß ¹ - 0.63