US1786916A

US1786916A - Objective corrected spherically, chromatically, astigmatically, and for coma

Info

Publication number: US1786916A
Application number: US304470A
Authority: US
Inventors: Merte Willy
Original assignee: Carl Zeiss SMT GmbH
Current assignee: Carl Zeiss SMT GmbH; Carl Zeiss AG
Priority date: 1927-09-29
Filing date: 1928-09-07
Publication date: 1930-12-30
Anticipated expiration: 1947-12-30

Description

Dea 3o, 1930.

ASTIGMATICALLY, AND FOR COMA 'iff' 164L66'- fca/ lang/#400' 8 41232.? 46! Y 'car/V /engmf Filed Sept. '7,

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Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE WILLY MERTE, OF JENA, GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS, OF JENA, I

GERMANY OBJECTIVE CORRECTED SPHERICALLY, CHROMATICALLY, ASTIGMATICALLY, AND FOR COMA Application led September 7, 1928, Serial No. 304,470, and in Germany September 29, 1927.

The present invention relates to photoafter relate to a focal length of the objecgraphic objectives consisting of four lenses, tives of 100 units.

separated by air, of which the two outer` ones Example 1 (Fig. 1) are collective and the two inner ones disper- .r sive and d1st1nctly men1sc1, their concave Rad Thiernesses "0 surfaces facing each other. and dlstans According to the present mventlon 1t 1s possible to obtain objectives with unusually gij: Sli @i113 large aperture, ail'ordlng the utmost sharpr5=+ 45.35 dn=1ao7 r4=111s.1s dm= 2.22 55 ness and brllliancy of the images produced, r5=+ 29.10 z2=19.5s by maklng dlstlnctly biconvex that one of 2; '1532253 the two collective lenses facing the lmage, r= 55.00 1F11. 74 .i Tn=+ 109.69 dv1=11.62 and by so chooslng the proportlon 1n whlch, rw= 68.20 n= 2. 74 1n the other collective lens, the curvature "F" 124'13 (.0

1" radius of the strongest curved boundary surp.

face stands to the curvature radius of the KINDS 0F GLASS other boundary surface, that it is algebraical- Lens nd v ly larger than the correspondmg proportlon 9 of the collectlve lens faclng the image. I 1 64238 48 o 65 o AAs d1st1nctly blconvex and distinctly {egg} 5310 menlscal one intends to des1gnate 1n this case 1v 1I457S jg such lenses lnwhlch, accordlng to the abso- XI jgg lute amount, the one radius is at most the VII 1-67292 32.2 centuple of the other. '70

I norder to eliminate certain d eiinlte re- Example 2 (F,g 2) malnlng aberratlons 1n the ob]ect1ves corresponding to the lnventlon a part of the four Rad 'rhicignesses lenses or also all four of them may be suband @stances divided lnto several members cemented to g .-5 30 each other. F+ 83's d10'75 2+ 321.0 li- 1.65 In the annexed drawing Figs. l and 2 each f=+ 44-8 d11=15-55 n=1150 dm= 5.05 Show an example of the lnventlon 1n a longlr5=+ ggg d z2=1g5 tudlnal sectlon. El; 5015 $221122 The two ob]ect1ves shown 1n the drawlng gi; lgj dvlg 80 and further explained in the subjoined tables r1o= 120.0

are destmed for use at a relative aperture of y 1:1.4. At this large aperture the spherical KINDS 0E GLASS aberrations of the two objectives are very l 40 slight. In the objective shown in Fig. 1, e. g. Le n 85A the maximum of the spherical aberrations I. l 64238 480 for the D: line only amounts to one thoun 1152300 5519 sandth of the focal length, whereby the cor' V 1.64238 48.0 rectlon of the obllque penclls 1s earned out VI 1.64238 4&0 90

415 quite satisfactorily. The values given herelce I claim:

l. Photographic objective corrected spherically, chromatically, astigma-tically and for coma, consisting of four lenses separated byl air, of which the two outer ones are collective, while the two inner ones are dispersive and distinctly menisci whose concave surfaces face each other, of the two collective lenses the one facing the image being distinctly biconvex and the proportion in which, in thev other collective lens, the curvature radius of the strongest curved boundary surface stands to the curvature radius of the other boundary surface, being algebraically larger than the corresponding proportion of the collecting lens facing the image. 'i

2. An objective comprising fourcomponents separated by air spaces, the two outer components being collective, the two inner components being dispersive, each of said inner components comprising two elements, the inner elements of the inner components having concave surfaces whichv face each other and provide an intermediate air lens, said front component being distinctly meniscus, both the surfaces of said rear component being convex.

3. Photographic objective corrected spherically, chromatically, astigmatically and for coma, consisting of four lenses separated by air, of which the twoouter ones are collective, while the two inner ones are dispersive and distinctly menisci whose concave surfaces face each other, of the two collective lenses the one facingthe image being distinctly biconvex and the other collective lens being a meniscus, the proportion in which, in this collective lens, the curvature radius of the strongest curved'boundary surface stands coma, consisting of four lenses separated byl air, of which the two outer ones are collec*y tive, while the two inner ones are dispersive and distinctly menisci whose concave sur-- ture radius of the strongest curved boundary surface stands to the curvature radius of the other boundary surface, being algebraically larger than the corresponding proportion of thecollecting lens facing the image.

6. Photographic objective corrected spherically, chromatically astigmatically and for coma, consistingV of: our" lenses separated by air, of which the two o'uter ones are collective, while the two inner ones are dispersive and distinctly inenisci whose concave surfaces, face each other, of the two collective lenses the one facing the image being distinctly biconvex, the refractive indices pertaining .to the D-line of the members contained in this lens amounting to at least 1.61, and the proportion in which, in the other collective lens, the Vcurvature radius of the strongest curved boundary surface stands 4to the curvature radius of the other boundary surface, being algebraically larger than the corresponding proportion of the icollecting lens facing the image.

i WILLY MERT.

to the curvature radius of the other boundary surface, being algebraically larger than the corresponding proportion of the collecting lens facing the image. v

4. Photographic objective corrected s herically, chromatically, astigmatically an for coma, consisting of four lenses separated by-V air, of which the two outerones are collective, while the two inner ones are dispersive j and distinctly menisci whose concave surfaces face eachother, of the two collective lenses the one facing the image bein distinctly biconvex and the curvature radius of the one boundary surface of this lens, according to the absolute values, being not larger than twice the curvature radius of the other boundary line of this lens, the proportion in which, in the other collective lens, thel curvature radius of the strongest curved boundary surface stands-to the curvature radius of the other boundary surface, beingy algebraically larger than the corresponding proportion of thecollecting lens facing the image.

5. Photographic objective corrected spherically, chromatically, astigmatically and forA www" wat