Development and characteristics of Petzval type objective including field shaping lens for focusing light of specified wavelength band on curved photorecepto

Coniglio, G. V.

English

NASA Technical Reports Server

July 30, 1968 
PETZVAL TYPE OBJECTIVE INCLUDING FIELD SHAPING LENS 
Fi led  Sept . 25, 1963 
V. COMIOLIB 
INVENTOR 
https://ntrs.nasa.gov/search.jsp?R=19710020551 2020-03-17T03:11:53+00:00Z
3,394,975 United States Patent Office ,, ,, ,,
3,394,975 
PETZVAL TYPE OBJECTIVE INCLUDING 
FIELD SHAPING LENS 
ments are designated successively St to  SS. The symbol 
- -  -. - 
Guy V. Coniglio, Rochester, N . Y ~  aspignor to tbe United 
States of America as represented by the Administrator ' 
of the National Aeronautics and Space Administration 
Filed Sept. 25, 1963, Ser. No. 311,387 
2 cla~ms.  (CI. 350-2) 
The present invention relates to optical objectives and 
more particularly relates to an objective for focusing light 
of a specified wavelength band upon a curved photorecep- 
F designates th; equivalent focai length of the objective 
10 herebelow. 
tor. 
Generally, the optical objective here disclosed follows . 0 7 0 8 < ~ ~ 1 . 0 7 8 2  (absolute value) 
the Petzval form of objective and it is an object of this I j 
invention to provide such an objective which is useful .laOBF<-R~<.1698B 
in collecting and focusing distant radiation in a curved R ~ a > f  Z.OF 
image surface such that its shape corresponds closely to .OglF<t~<.laBF 
the shape of a photoreceptor plate or the like. .0516F<ta<.063F 
.0368F<ta<.WF It is a further object to provide such a device which 20 .059~<t(<  .07zF 
is composed of simple optical components, and further- .01116<t6<.0135B 
more it is an abject to provide an optical system which .Om5F<S1<.0461F 
is capable of wide band transmission of the order of -32 .557F<Sa<.@lP 
.0412F<Sa<.0504F 
micron to .6 micron. .398F<S~<.481F 
Further objects and advantages will be apparent from 2.i .01577F<Ss< ,01827F 
a study of the specification herebelow taken in connec- One of the novel features of this invention concerns 
tion with the accompanying drawing wherein the single the optical materials from which the lens elements are 
figure represents an optical diagram of an objective con- made and in this regard the lens elements designated I, 
structed according to the present invention. IV and V are constructed of fused quartz having a re- 
A preferred form of the objective is designated gen- :{() fractive index of substantially 1.4754 with respect to radi- 
erally by the numeral 10 in the drawing and said objec- ation having a wavelength A=.36 micron. Furthermore, 
tive is composed of three succes\ive and mutually spaced the remaining two lens elements I1 and 111 are made of 
groups of lenses, the front group of lcnses nearest to en- CsI (cesium iodide) which has a refractive index of sub- 
trant light as shown by the arrow being designated suc- stantially 1.8832 for wavelength radiations k=.36 micron. 
cessively I and 11, the second lens member being desig- In a more specific manner the constructional data for 
nated 111 and IV and the third member being designated the objective 10 may be stated with regard to  the con- 
V. The lens V is so constructed along with the other two struction data above mentioned as given in the table of 
lens members that a curved field o r  image having the mathematical expressions herebelow. 
radius r is produced whereby said objective may be used 
in a device such as a star tracker having a photosensi- 40 RI=.762F 
tive plate located in conformity to the image P. It will -Rz=2.665F 
be understood that the objective 10 is corrected for the -RS=1.160F 
ordinary chromatic, spherical and astigmatic aberrations -R4= 1.857F 
as well as coma and distortion within good and acceptable R5=.396F 
optical requirements. R6=.325F 
The front lens member is composed of a double con- 46 R7=.378F 
vex lens element which is designated I, this element be- -R8=5.070F 
ing spaced from a rearward meniscus lens element which -RB=.1453F 
is designated I1 by an axial distance Sl. Spaced rearwardly R1,=Plano 
from the front lens member by a distance Sz is the sec- 60 tI=.115F 
ond lens member which is composed of a meniscus lens t2=.0573F 
whith is designated III and is separated from a rearward t3= .0409F 
double convex lens element IV by an axial distance which t,=.0655F 
is designated Sa. Spaced rearwardly of the second lens t5=.0123F 
member by a distance S4 is a field shaping singlet lens 65 S1=.0328F 
element designated V which is located at an axial dis- Sz= .6 19F 
tance of S5 ahead of the curved image surface P. S3=.0458F 
For properly attaining the objects of this invention the S4=.437F 
constructional data for the objective 10 should be speci- S5=.0175F 
fied according to the values stated in the table of math- 6O It  is to be understood that the above given values are 
ematical statements herebelow wherein RI to Rlo desig- determined for an objective which transmits radiation 
nate the radii of the lens surfaces of the successive lens in a wave band of substantially k=.36 micron as above 
members I-V and the minus (--) sign used therewith is mentioned, and the designations for various data have 
assigned to those surfaces having their centers of cur- the same meaning as used in the previous tables. 
vature located on the entrant side of their vertices, the 66 The values for the constructional data of said objec- 
axial thicknesses of said successive lens elements are rep- tive are stated numerically in the chart of values appear- 
resented by tl to t ~ ,  and the axial spaces between the ele- ing herebelow, the designations for radii, lens thickness 
designated JV, 
she third lees member which is a singlet negative field 
3,394,975 
3 4 
and lens spaeang as tvell as the refractive index being the t4=.0655F 
same as gavrn hereabove except that the refractive index t,=.0123F 
rs desagnated by no. S1=.0328F 
S2=.619F 
E P =12? CL~ rnm when X= 36 mlclon ) S3=.0458F 
shaping lens being of concave plan; form-and being 
debignaicd V, 
the s,pecific optical data for constructing said objective 
be:ng given in  the table of mathematical expressions 
he iehr l : ,~  wbercin R,  to Ri0  designate the radii of the 
lens sarfsces of the successive lens members I to V, 
a d  t h s  r n l i ~ i ~ s  ( - - )  \ign used therewith is assigned to 
thoie i,rrlacc\ hiiviny their- ccnters of curvature lo- 
catcti on thc entrant side o f  their vertices, the axial 
ihicknclxez of said \~~ccessive icns clcmcnts are repr-e- 
senled by rl 10 r 5 .  ~ t n d  the axial spaces between thc 
c!crnenti are deiignated succc\sivcly Sl to S5, 
References Cited 
UNITED STATES PATENTS 
T o  2.541,484 2/1951 Schade 88-57 
FORLION PATENTS 
S4=.437F 
na SS=.0175F 
said object~ve further be~ng  characterized by its 
1 4754 quartz lens elements I, IV and V hav~ng a refractive 
11) lndex for ~ t s  optlcal material of substantially 1.4754, 
and 1ts Csl lens elements I1 and I11 having a refrac- 
1 88.52 
t ~ v e  index for ~ t s  optlcal material o t  substantsally 
1 8832 for A=.36 micron. 
1 88 2. A Petzval type of projection objective for focusing 
32 1: a beam of rad~atlon of A=nomlnaliy .36 micron forming 
47 a curved image surface having a radius of substant~ally 
5 
.256F, where F represents the equivalent focal length of 
said objective, sald objective compr~sing three lens mem- 
1 47 bers which are optically al~gned with and spaced from 
54 20 each other, 
- 
the front lens member on the entrant side including a 
Leas 1 Ralla 1 Thicknesses 1 Spaces 
710,126 Y/1941 Germany. 
;a JOHN K. COKHIN, Plitnnry Examiner. 
front double convex lens element wh~ch  is made of 
A i :b ,~~gh  only certain forms of t h ~ s  invention have fused quartz and 1s designated I, and further includ- 
been shown 2nd described in detatl. it wlll be understood ing a redr concavo-convex lens element whlch is 
forms arc poss,ble and changes may be made ''' spaced from elements I and 1s folmed of CsI and 
in the values of the op t t~a l  data wlthln the stated ranges 1s designated 11, 
hlehorn~ departing from the spirit of the invent~on as the second lens member including a front convex- 
s;i,iimed hereoelow concavo lens elcmenl wh~cll r i  m'ide of Csl dnd 15 
I eldarn daignated 111, and t~trther includes a double  onv vex 
1 A Petrb,al fype plojeilion objective fol focu>rng "I' lens element which 15 spaced from element 111 and 
9. ~ e d m  of saJution of A=nomin,illy .36 micron form- 1s formed from fused quartz, satd element being 
~ q g  a c~irved ,;aagc s ~ i f a c e  having a rad~us  of substantial- designated 1V, 
Bv 364~. wBlere F repreients t h e  equivalent focal length the thtrd lenr member which 1s a singlet negntlve field 
of saib oblectlve, 5 d i J  object~ve cornpnsing three lens .,_ shaping Lens be~ng of c o n a v o  pldno form and being 
members wkich are optically aligned with and spaced " des'gnated "3 
from each other, the constructron~l dnt'i for said objective being given 
the front Bells member on the entrant side including a in numerical values ~n the chart herebelow wherein 
ermt double cantex lens element which is made of R1 to R,, designate the r a d ~ i  of the lens surfaces of 
fused qua:tz and 1s designated I, and further ~nclud- 4,, the successive lens elements I to V and the minus 
lag a r:,nr concavo-convex lens element which 1s (-1 slgn used therewith means that the center of 
>paced from element I and 1s formed of Csl dnd 1s cllrvdture l ~ e s  on the entrant stde of the vertex of 
designatizd 11, such surfaces, the axial thicknesses of said lens ele- 
the second lens member including a front convex- ments are repre5ented by f, to t5, the axial spaces 
concavo lens element whlch 1s made of Csl and IS between the elements are designated successively 
destgnated BIL and further lncludes a double convex 43 S1 to S5, and n~ denotes the refractive index of the 
:ens element which is spaced from element 111 and optical materlali ~n said elements for transmitted 
ns formed from fused quartz, said element being rad~atlon of A =  36 mlcron, 
s1=4 o 
S , = i 5  7 
S 3 = 5  6 
& = 5 3  45 
S<=L 14 
---- - - --- 
i~t ,  -92 897 I i \  -P> -325 09 
il I!- di'~ = 141 50 
\ - -R~ - LL' 01 
Rd-48'25 
B1I i Ru -3 4 b92 
' i  R =4b13.! I )  
I -b19 44 ku i7701 I ilo - iiii"o 
- 
11=14 0 
t z = i  0 
t3=5 0 
t r=S  o 
tn= l  5 


Petzval type objective including field shaping lens Patent

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