DE2416400A1 - ZOOM LENS - Google Patents

Description

Applicant: Cäion Kabushiki Kai'sha, 30-2, 3-chome, Shimomaruko, Ohta-ku, Tokyo, Japan

Zoomobj ective

The invention relates to a zoom lens for film cameras, with which sharp recordings both at close range and in the usual Adjustment range of the lens can be made.

With zoom lenses, with which so-called macroscopic Recordings can be made, the focusing element is divided into two lens groups, one of which is out of its normal position is moved, or either the compensator member or the variator member or both members are out of their normal position emotional. For lenses that allow close-up photography by using a magnification changing member, however, there is a problem that focusing cannot be performed unless a special adjustment is made is present, or that the zoom member can be operated after an adjustment has been made in the close-up range.

The invention therefore aims to improve a zoom lens in such a way that the relay element does not take part in the change in the Magnification takes part and is divided into two groups, one of which is moved to focus in the close-up area.

40984 3/0827

2416A00

It is the object of the invention to provide a compact zoom lens with which the subject can be observed through the viewfinder, to form such that the relay member in a front group and a rear group is subdivided, between which a beam splitter for the beam path for the finder optics is arranged is. Furthermore, a good observation image should be achieved by the front group, in which the splitter of the object in the beam incoming light beam is made afocal or almost afocal.

This object is achieved by the characterizing part of claim 1. Advantageous further developments of the invention are the subject of the subclaims.

The invention is to be explained in more detail, for example, with the aid of the drawing. Show it:

1 shows a schematic exemplary embodiment of a zoom lens according to the invention;

2 shows an embodiment of a zoom lens according to the invention;

Figures 3A, 3B and 3C are graphical representations of various Aberrations at infinite distance setting at the end of the wide-angle range of the lens in FIG. 2 with different numerical Values;

Figures 4A, 4B and 4C are graphical representations of various Aberrations in setting a distance of 23 mm from the lens; and

5 shows a further exemplary embodiment of a zoom lens according to the invention.

The embodiment of a zoom lens shown in Fig. 1 contains a positive focusing element 10, which is used when the focal length is set within a conventional focal length range of the lens, and a negative variator element H ₁ a negative compensator element 12, whereby

409843/0827

a total of a zoom member 13 is formed. Furthermore, a positive front group 14 and a positive rear group 15 of a relay element are provided. A beam splitter 16 can, for example, be a semitransparent mirror which is arranged inclined in a glass block and enables beam splitting to a finder optics 17. The front group 14 of the relay member is moved on the optical axis from the outside of the lens barrel. The light beam between the front group 14 and rear group 15 is afocal or nearly afocal and the beam splitter 16 between the groups 14 and 15 is arranged so that a viewfinder optical system is formed. This front group 14 can have either a positive or a negative refractive power according to the composition of the zoom member which is arranged in front of the front group 14. The inclination of the light beam, which enables particularly good observation, is between -4 diopters and +4 diopters. A numerical example I yet to be explained relates to the case with 0 diopters, while a numerical example II relates to the case with -4 diopters. The +4 diopter case results as the symmetrical embodiment of the -4 diopter case.

The front group 14 approaches the imaging side accordingly when the object distance is small, while it remains stationary in a position close to the compensator element 12 when the object is in the usual focal length range of the lens is recorded.

When carrying out macroscopic recordings with this zoom lens, it is practically not necessary to make an adjustment of the focusing member 10, which can usually be focused at infinity, while the maximum macroscopic Effect can be achieved when the zoom position is selected on the wide-angle side.

In addition, recordings with several focal lengths can be carried out if, in macroscopic recordings, part of the Relay member is moved. When the zoom member 13 is set to wide-angle

P416400

Operation is set, while the front group 14 for setting a very short distance is moved, and the zoom member 13 is set to the telephoto range while the focusing member is set such that a focus is made on an object at an optional distance, a focus adjustment on objects that lie between the two objects mentioned, take place one after the other when the zoom operation is carried out will. In embodiments according to the invention, it is therefore possible to make the entire lens compact without the To reduce the efficiency with which the observation of the focusing through the viewfinder optics is possible by in the relay element a beam splitter is provided through which light is deflected into the viewfinder optics.

In the following, numerical examples of the components of the exemplary embodiment according to the invention are given in FIG will. It means:

R: radius of curvature of the refractive plane, where R- and R _{2 are} the radii of curvature of the beam splitter for the viewfinder optics, while R _ and R_ are the radii of curvature of the beam splitter for a light measurement.

d: The thickness of the air gap along the optical axis

between adjacent refractive planes. N: The refractive index of the glass (d-line). V: Abbe «see number of the glass,
f: focal length of the entire optics.

f = 7.49085 - 25.19674 - 58.22425 F = 1.4

R ₁ = 131,918

ä _± = 1.72 N ₁ = 1.80518 ν _χ = 25.4

R ₂ = 55,365

d ₂ = 8.50 N ₂ = 1.64000 V ₃ = 60.2

R ₃ = -198.061
d "= 0.10

4098Λ3 / 08

? 41 R A O

R ₄ = 43,354

d ₄ = 5.00 N ₃ = 1.64000 V ₃ = 60.2

R ₅ = 94,875

dj- = changeable

R ₆ = 104,043

dg = ^- 0.70 N ₄ = 1.71300 V ₄ = 54.0

= 19,844

d = 3.20

R ₈ = -3 8,740

d _p = 0.70 N- = 1.77250 V _c = 49.6 ob b

R ₉ = 36,985

d ₉ = 2.30

= -101,786

d _{n /} _ = 0.70 N._ = 1.72342 V, = 38.0 JO 6 6

R ₁₁ = 16,543

d., = 4.50 N "= 1.78470 V" = 26.2 11 7 7

R ₁₂ = -72.3 04

d ₁₂ = changeable

R ₁₃ = -27,427

d ,,. = 0.60 N _Q = 1.78590 V ₀ = 44.2

R ₁₄ = 24,284

d _l4 = 2.50 N ₉ = 1.75520 V ₉ = 27.5

R ₁₅ = -199,487

d ₁₅ = changeable

R ₁₆ = -319,952

d ₁₆ = 0.60 N ₁ = 1.69895 V ₁ = 30.1

R ₁₇ = 276,454

d ₁₇ = 2.50 N ₁₁ = 1.69680 V ₁₁ = 55.7 = -33.288

d ₁₈ = 0.10

= 224.854

d ₁₉ = 1.50 N ₁₂ = 1.64000 V ₁₃ = 60.2

409843/0877

^R 20 ⁼ -59,960 ^N 13 = 1.63854 ^V 13 R ₂₁ = d = changeable OO N ₁₄ = 1.75700 ^V 14 ^R 22 = d ₂₁ = 11.00 ^R 23 ⁼ OO
d ₂₂ = 5.50 N ₁₅ = 1.71300 ^V 15 21,700 R ₂₄ = d ₂₃ = 3.15 ^N 16 = 1.80518 ^V 16 ^R 25 ⁼ 65,650
d ₂₄ = o.io ^R 26 = 11,500
d ₂₅ = 3.88 36,600 ^N 17 = 1.78470 ^V 17 ^R 27 = d ₂₆ = 1.59 ^R 28 ⁼ 8,130
d ₂₇ = 6.29 * 1 Q
1 ₁ Q = 1.67790 ^V 18 -13 .800 ^R 29 = d ₂₈ = 1.72 49,460 ^R 30 ⁼ d ₂₉ = 3.90 ^N 19 = 1.66446 ^V 19 -18,660 ^R 31 ⁼ d ₃₀ = 1.76 137,390 ^R 32 = d ₃₁ = 2.36 ^N 20 = 1.59270 ^V 20 -31,920 ^R 33 ⁼ d ₃₂ = o.io 21,420 ^R 34 = d ₃₃ = 1.80 ^N 21 = 1.63854 V ₁ 1051.429 R ₃₅ = d ₃₄ = 1.20 OO ^d 35 ^{= 6} * ⁸⁰

= 55.4

= 47.9

= 54.0

= 25.4

= 26.2

= 53.3

= 35.8

= 35.6

= 55.4

409843/0877

^R 36 =

9416400

-7-

Variable distances

7.49085

25.19674

48.22425

d _c 1.03 822
d ₁₂ 41.98886
d ₁₅ 1.67046
d ₂₀ 2.00000

29.05507

10.85437

4.78811

2,000,000

39.72751 3.68058 1.28946 2.00000

The above values for the variable distances relate to an infinite distance, while in an example for a close-up the object can also be focused at a distance of 23 mm in front of the first level of the optics if optics IV 1 _# 3 mm at the end of the wide-angle range is moved to the imaging side in such a way that d ₅ 1.03 822, α _χ2 41.98886, d ₁₅ 2.97046 and d _2o 0.70000.

3A, 3B and 3C show graphs of FIG Aberrations in the case of infinite distance adjustment at the end of the wide-angle range in the above-described embodiment .

FIGS. 4A, 4B and 4C show graphs of FIG Aberrations in the case of focusing at a distance of 23 mm from the object.

From these graphical representations it can be seen that in macroscopic recordings with such short distances the aberration compensation efficiency is not significantly reduced.

The following is a numerical example of the embodiment can be given in FIG. 5. It means:

4098 ^ 3/0877

/ 416400

R: radius of curvature of the refracting plane, where 16 is a small NEN totally reflecting mirror referred to, which is arranged in the beam path.

d: The thickness of the air jet along the optical axis between adjacent refractive planes.

N: refractive index of the glass (d-line).

V: Abbe's number of the glass.

f: focal length of the entire optics.

f = 8.36571 - 12.62154 - 19.68136 F = 1.4

^R l = 196,669 1.75520 V ₁ = 27.5 d _x = 1.20 N = 1.58913 ^V 2 = 61.1 ^R 2 = 38.182
d "= 9.32 N, = ^R 3 = -68,346
d ₃ = 3 p.m. 1.58913 V ₃ » i 61.1 ^R 4 = 28,633
d ₄ = 5.35 N ₃ = ^R 5 = 138,699
d ,. = changeable 1.58913 ^V 4 = 61.1 ^R 6 = -98,983
d _c = 0.70 N. = ^R 7 = 14,566
d ₇ = 4.46 1.51633 ^V 5 = 64.1 ^R 8 = -30.902
d _Q = 0.70 N_ =
it b 1.80518 ^V 6 = 25.4 . ^R 9 = 16,716
d _g = 2.56 N ₆ = * 10 = 27.607
d ^ = changeable 1.58913 ^V 7 = 61.1 * 11 = 172,499
O ₁₁ = 3.36 N ₇ =

/ 416400

^R 12 ~ -24,701 1.62299 ^V 8 ⁼ 58.2 d ₁₂ = o.io ^R 13 ⁼ 16,344 1.80518 ^V 9 ⁼ 25.4 d ₁₃ = 5.68 N ₈ = ^R 14 = -25,088 d ₁₄ = 0.80 N ₉ = ^R 15 ⁼ -56.207 1.51633 ^v io = 64.1 d, _c = changeable
Ib ^R 16 ⁼ -40.147 1.77250 ^V ll = 49.7 ^d 16 = ¹ ^ ⁰⁰ ' ^N 10 = ^R 17 = 11,433
d, - = changeable ^R 18 ⁼ 17,108
d ₁₈ = 4.05 N ₁₁ = ^R 19 ⁼ -68,089 1.80518 ^V 12 = 25.4 d ₁₉ = 0.83 ^R 20 ⁼ -21,643 1.77250 ^V 13 = 49.7 d ₂₀ = 1.00 N ₁₂ = ^R 21 ⁼ 13,976
d ₂₁ = 2.59 ^R 22 ⁼ 43,687
d ₂₂ = 3.97 N ₁₃ = 1.77250 ^V 14 = 49.7 ^R 23 ⁼ -16,313 d ₂₃ = o.io ^R 24 ⁼ 13,924
d ₂₄ = 5.60 N ₁₄ = ^R 25 = -752,855

4098A3 / Q877 ORIGINAL INSPECTED

/ 416400

-lO-

Change the spacing

8.36571

12.62154

19.68136

IO

15th

17th

0.86243 13.03903

0.28864 12.00000

4.87184

7.11852

2.19974

12.00000

8.14022 1.10440 4.94549

12.00000

The values given above for the variable distances relate to an object at an infinite distance, while in an example for a close-up with an object distance of 75.6 mm in front of the first level of the optics, focusing can take place when the optics 14 2.0 mm to the imaging side is moved in such a way that d _{5 is} 0.86243, d ₁₀ 13.03903, ά _{± 5} 2.28864 and d _ly 10.00000.

Claims (1)

-11- claims ./Zoom lens that allows you to take close-up pictures, characterized in that the zoom member (13) has a focusing member (10), a variator member (11) and a Compensator element (12) contains that a relay element (14) is arranged closer to the imaging side than the zoom element (13) and a lens group movable along the optical axis, and that includes a fixed lens group and a beam splitter (16) are provided in order to deflect a light beam into the viewfinder optics. 2. Zoom lens according to claim 1, characterized in that the movable lens group (14) between the zoom member (13) and the beam splitter (16) is arranged so that the light beam emerging from these lens groups at least is approximately afocal, and that the fixed lens group has a positive refractive power and splitter between the beam and the image level is arranged. 3. Zoom lens according to claim 2, characterized in that that the refractive power for the light beam emerging from the movable lens group is between +4 and -4 Diopter is. 4. Zoom lens according to claim 3, characterized by: f = 7.49085 - 25.19674 - 58.22425 F = 1.4 R ₁ = 131,918 α _χ = 1.72 N ₁ = 1.80518 V _± = 25.4 R ₂ = 55,365 d _o = 8.50 N ₀ = 1.64000 V ₀ = 60.2 R ₃ = -198.061
d ₃ = 0.10 4 0 9 8 L 3/0 8? 7th 2M6400 R ₄ = 43,354 = 5.00 N ₃ = 1.64000 V ₃ = 60.2 R ₅ = 94,875 d, - = changeable R, = 104,043 ο dg = 0.70 N ₄ = 1.71300 V ₄ = 54.0 R ₇ = 19,844 d ₇ = 3.20 R ₈ = -38,740 d _Q = 0.70 N _K = 1.77250 V _c = 49.6 ob R _g = 36.985 d _g = 2.30 R ₁₀ = -101,786 ^d 10 ⁼ ° ^{70 N} 6 ⁼ 1-72342 V _g = 38.0 R ₁₁ = 16,543 ^d ll ^{= 4} · ^{50 N} 7 ^{= 1} ^ ^{78470 V} 7 = 26.2 R ₁₂ = -72,304 d ₂ = variable R ₁₃ = -27,427 d ₁₃ = 0.60 Ng = 1.78590 V _g = 44.2 R ₁₄ = 24.284 d ₁₄ = 2.50 N ₉ = 1.75520 V ₉ = 27.5 R ₁₅ = -199,487 d = changeable R _1C = -319,952 Xb ^d 16 ⁼ ° * ^{60 N} 10 ^{= 1} ^ ^{69895 v} io ^{= 30} * ¹ R ₁₇ = 276,454 d ₁₇ = 2.50 N ₁₁ = 1.69680 ν _χ1 = 55.7 R ₁₈ = -33.288 d ₁₈ = 0.10 409843 / G877 / 416400 -11- = 60.2 ^R 19 ⁼ 224.854 N ₁₂ = 1.64000 V ₁₂ N ₁₃ = 1.63 854 V ₁₃ d _ig = 1.50 ^R 20 ⁼ -59,960 d_ = changeable ^R 21 ⁼ d ₂₁ = 11.00 N ₁₄ = 1.75700 V ₁₄ ^R 22 = d ₂₂ = 5.50 • 21,700 ^R 23 ⁼ d ₂₃ = 3.15 N _{1 c} = 1.71300 .V ₁₁ -
io Ib 65,650 ^R 24 ⁼ d ₂₄ = o.io N ₁₆ = 1.80518 V ₁₆ 11,500 ^R 25 ⁼ d ₂₅ = 3.88 36,600 ^R 26 = ^d 26 ^{= X 59} N ₁₇ = 1.78470 V ₁₇ 8,130 ^R 27 ⁼ d ₂₇ = 6.29 N ₁₈ = 1.67790 V ₁₈ -13,800 ^R 28 ⁼ d ₂₈ = 1.72 49,460 ^R 29 ⁼ d ₂₉ = 3.90 N ₁₉ = 1.66446 V ₁₉ -18,660 ^R 30 ^{= d} 30 ^{= 1} ^ ⁷⁶ 137,390 ^R 31 = d ₃₁ = 2.36 N ₂₀ = 1.59270 V ₂₀ -31,920 ^R 32 ^{= d} 32 ⁼ ° ¹⁰ 21,420 ^R 33 ⁼ d ₃₃ = 1.80 1051.429 ^R 34 ⁼ d ₃₄ = 1.20 = 55.4 = 47.9 = 54.0 = 25.4 = 26.2 = 53.3 = 35.8 = 35.6 40984 3/08 ?? Variable distances 7.49085 25.19674 58.22425 12th 15th 2O 1.03822 41.98886 1.67046 2,000,000 29.05507 10.85437 4.78811 2,000,000 39.72751 3.6 8058 1.28946 2.00000 R: radius of curvature of the breaking EbBnC ₇ R. and R _{33 are} the radii of curvature of the beam splitter for the viewfinder optics and R ^ c ^and R-3C are the radii of curvature of the beam splitter for the light measurement. d: The thickness of the air gap along the optical axis between adjacent refractive planes. N: refractive index of the glass (d-line). V: Abbe »see number of the glass. f: focal length of the entire optics. 409843 / Ö877