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oct. 15,1946.
2,409,364
H. F. KURTZ EI'AL
OPTICAL INSTRUMENT
Filed OGLA 13, 1943
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FIG .2.
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ROBERT @MORRISON Y
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Patented Oct. 15, 1946
2,409,364
UNITED STATES PATENT OFFICE
-
2,409,364
OP‘TÍCAL INSTRUMENT v
Henry F. Kur‘t‘i, Rochester;` ‘a?dëlt‘öbert G. More
risen, Greece,- N. Y., as'signo?sl to' Bausch &
Lomb Optical Company, Rochester,
Y.,l Aa
corporation of New York
Application 'october 13, 194e", serial No. 506,676
8 Claims.
2
determined desired position merely bythe as
This invention relates to optical instruments,
sembly of the cap to the body. Thus the align
men-t of the ‘optical axis ofthe eyepiece With the
axis of the other optical'elements of the instruf
such' as telescopes; and more particularly to bi--
nocular telescopes; This application is a con*
tinuatiön-i'n-part of our co-pendingmapplication
Serial No.- 456,238 filed August 26, 1942.
rne'n‘t is not left' to the skill of the workman but
s
, is reduced to a simple assembly operation easily
Inf binoculars heretofore proposed, the eyepiece
completed by the ordinary Worker.
or ocular tube has been carried by a mounting"
tube usually threaded into the end‘wall or a de
tachable cap forming an end Wall of the body
of the instrument. `I-n the instrument of" the
present invention, the mountingtube is made in;
tegra‘l with a detachable cap forming the end
Wall óf the‘sam‘e and the threaded joint on the
10
.
n
.
,
,
_
agasiï-‘et is placed on the end face of the body and
ce'mpiîesse'd when the surface on the ñange of the
cïap" is brengt-'iii into close engagement with the
uniplanar suria'ceßoi thev body;- In previously
proposed binoculars, Where tl'ie end surface of
the body' has been used as'v the reference plane,
exterior surface of> the` instrument is thus climi;
Hated»
_
To seal the jointure between the cap and body,`
15
The ocular tube is‘telescopica-lly mounted w'itl‘ie
inthe mounting tube and the axis of the ocular’
tube is hel'dï coincident with the axis of the
mounting tube through guide surfaces formed
cate had te betalàen 'that the gasket was of con
stant thicknessl and that `it Was evenly corn
pressed over ‘its entirety,> 'för otherwise the cap
would not'be disposed in the desired angular pc
sition relative t‘o` the optical»` axis cf the objec
0% the exterior" of the' ocfu'lar‘tube and the >in 20 ti-Vè.
At the objective; the line of jointure between all
terio’r of the mounting tube. The guide surfaces
suriaees óithe" objective mounting are sealed by
not' onlyV hold» the axis of the‘` ocularv tube coin
means oi- >alg‘a'sk'et held in place by a locking ring
cident with the axis of the mounting tube during
which locks the" objective in position. This ring,
the axial» movement of the ocular but also tend to
seal- th'e telescopic connection between the two 25 in the now preferred form of thepresent inven
tion,A isïhe‘ld against movement byv a guard cap
secui'ed t’oth‘eîbbdy‘ ofthe instrument, which fur
As* the VAmounting tube actually carries' and is'
ther seals the body againstv entrance of» moisture.
used to'po‘sitiontlie optical elements of the ocular
Other features and advantages' Aof the' present
relativ‘eßto the body, means arep‘rovided for 1o
niloes‘l.`
'
Y
_
-
catingtneïcapi?elative toÁa uniplanar surface es
invention will‘be“ apparent Vfrom- the-sfollowing ~
tablishïing 'ai- reference plane used to locate> and
mount the' optical elements of the> instrument.
panying drawing, in which:
description' takenli’nïconjunction with the accom*
of the binocular illustrative ofthe present inven
surface held AnormalA to the axis of the mounting
tube and adapted to engage the surface’ of the
body defining the reference plane'. In‘ the eln
bodiment of the invention now preferred, this"
surface is formed on a shoulder of thebody‘ ad'
j‘a‘cen't the end closed by the cap and the en-V
gaging'sur’face of the cap is» formed on the end
face of a flange adapted to clrcumscribe the‘o‘pen
end of the body. As the axis ofthe mounting
tube is normal to the plane of the endface of
the iiange,~ the axis of the tubular member and
consequently the axis of the ocular will be'no'r'f
mal to the reference plane when the cap is
mounted to the body.
1
‘f Fig.` 2i Ísg'á.' SeGÜÍOhal‘VîeW' partly ltr elevation 0f
the upper endlof thebi'n‘cc'ular.
`
4
~ Fig. 4v is a ViewÁ similari to nig”. z’but‘ snowingA
the: 4objc-active endf ‘ci the? binocular-.
As both" E'Ody units' Gif the instrument CifI the ‘
present invention are‘iden‘ticalà only one unit has*
been illustrated although itisïtc‘f b’e‘understood
that'
instrument v’comprises 'two body units
which; `if desired; -I-‘n’a‘y be» pivotally secured to
gether'toÄ allov'v the units'tc be adjusted so that
'
the‘eyep'ieces may be spacedf- apart the necessary
pupilla'ry' distance' to meet the requirementsof a
in thence preferred form of the presenpl- iri
vention, the body is preferably molded Withthe
opposite ends' open to permit the prism elements `
onlthemounting» tube-when thecapfis-secured to n
mounting'i tube‘r-Will -be located and heidi -ilnf a pre-4
)
8 istia‘ section taken alc'ngl- line: 3-¿1-3 of
To locate the axis of the ocular in apredeter
minedI desired position, a locating surface‘- is
formed on the walllof the body' of the' instrument
and is engaged by a cooperating surface formed
th‘e‘bl'ady.` The locating surfaceis- so formedire‘l‘
ati‘ver` to thelreference plane thatv the axis of`
Y
Fig. 1` is an elevational yievv of one body unit
s To this end, the cap isff'ormed with a uniplanar'
to ` b'elr'no'í‘e easily’ assembled therewith.
ai
The one
2,409,364
3
4
integrally formed therewith a mounting tube I2
normally projecting outwardly on opposite sides
termined distance from the reference plane es
tablished by the-face I9.
thereof. The interior surface of the outer por
tion of the tube I2 is threaded and takes a
To locate the axis of the ocular in a predeter
mined desired position, a locating surface is
threaded ocular tube I3 carrying eyepiece lens CR formed on the mounting tube I2 which, when
elements, one of which is indicated at I4 and
brought into engagement with a correlated sur
shown locked in position within the same by a
threaded band I5. The eyepiece elements are
face on the body, ñxes thev axis of the mounting
tube in the desired position.
As the ocular tube
accurately mounted within the tube I3 with the
will have already been positioned in the mount
optical axes thereof coincident with the axis of lO ing tube, the assembly of the body and cap brings
the tube.
.
the optical axis of the ocular tube into the de
To align the axis of the ocular tube I3 with
sired relationship with the reference plane de
that of the mounting tube I2, an accurately
termined by the surface I9. Although the lo
formed cylindrical surface I‘I is machined-on the , eatingA surfaces may be formed in any manner
interior of the tube I2 and this surface, together
desired, it is now preferred to form the same
with a cylindrical surface I8 concentric there
cylindrical and, in the illustrated embodiment of
with and formed on the interior of a ring I8'
the invention, the one surface 2| is formed on
threaded into the opposite end 'of the tube I2, '
the adjacent faces of the blocks 22 cast integral
engages spaced portions of the exterior surface
with the wall of the body Il) and the inner por
of the ocular tube I3 and holds the same in the 20 tion of the wall of the body intermediate the
desired position relative to the mounting tube I2.
blocks. The axis of the surface 2| is normal to
The annular passage between the two tubes is
the plane of the surface 2U and forms a relatively
very effectively sealed due to the threaded con
large locating surface cooperating with a similar
nection and the close engagement between the
machined surface 23, formed on the exterior of
exterior surface of the tube I3 and the spaced
the lower portion of the tube I2. Thus, when the
bearing surfaces I 'I and I3.
cap is placed in position on the body I0 with the
In the assembly operation, the ocular tube is
two surfaces 2I and 23 in engagement, the axis
merely threaded into the mounting tube and as
of the ,tube I3, and consequently the optical axis
the two surfaces I'I and I8 will align and hold in
of the eyepiece, will not only be held normal to
alignment the assembled tubes, the step of align 30 the reference plane but will be also located in
ing the ocular tube with the mounting tube is
the desired position relative to the same.
`
reduced to a simple assembly operation easily
To seal the body at the end closed by the cap
completed by the ordinary workman.
I I, a gasket 2li is seated on the end face 25 of the
Furthermore, in prior devices, where the
body Ill and is clamped against the same by the
mounting tube was threaded into the body, small
cap I I as the latter is drawn up against the body
chips, out by the meshing threads as the tube
by screws 25 received in tapped holes formed in
and body were assembled, dropped into the body
the blocks 22 and a boss 2l integrally formed
and if not remo-ved tended to foul the surfaces
with the body during its forming operation. The
of the optical elements of the body.
gasket has a greater thickness than the distance
After the ocular tube I3 has been assembled
between the end face of the body member and
with the mounting tube I2, the cap can then be
the inner surface of the ycap after the uniplanar
secured to the body I0 of the instrument. As the
surfaces of the body and cap are in facewise en
mounting tube I3 actually carries and is used to
gagement so that the the gasket is compressed
align the eyepiece of the instrument relative to
after the cap is mounted to the body. In previ
the same, it is important that the cap be so 45 ously proposed binoculars where the end face of
mounted to the body that the axis of the mount
the body has been used as the reference method,
ing >tube will be located in a predetermined posi
care had to be taken that the gasket was of con
tion relative to the optical axis of the other
stant thickness and that it was evenly com-,-elements carried by the body, for unless this is so,
pressed over its entirety, for otherwise the cap
the optical axis of the eyepiece will not be in 50 would not be disposed in the desired'angular po
proper alignment with the optical axis of the
sition relative to the optical axis. It will be ob
other elements.
vious that this diñ‘lculty has been obviated by the
To insure that the axis of the mounting tube
construction of the present invention.
I2 will be in the desired position after the cap
The tube I3 carries an eyecup 30 andra diopter
is assembled to the body, the body is formed with 55 band 3| which telescopes the upper portion of
a shoulder adjacent the end enclosed by l¿he cap
the tube I2. The tube I2 is marked with an in
and the face I9 of the shoulder is accurately ma
dex line 32 cooperating with the usual gradua
chined uniplanar. In the preferred form of the
tions. 33 of the diopter band. The diopter band
present invention, the face I9 is used to establish
rotates with the tube I3 during the adjustment
a reference plane for mounting and locating the 60 thereof longitudinally-ofthe tube I2 and will in
optical elements of the instrument. The cap is
dicate to the user the particular settingV of the
eyepiece in diopters. I
formed with a depending flange and the end face
2i! of the flange is machined uniplanar, and is
In the now preferred embodiment of the device
adapted to engage the surface I9 when the cap
of the present invention,V the ring I8’ forms a
is mounted on the body. The plane of the face 65 stop collar for limiting movement of the ocular
2l) is maintained normal to the axis of the mount
tube I 3 and will prevent the same from being
ing tube I2 so that when the cap is mounted to
threaded out of the tube I2. The ring in one
the body with the surfaces I9 and 2U in facewise
limit of adjustment limits the movement of the
engagement, the axis of the tubular member,
and consequently the axis of the ocular, will be
normal to the reference plane established by the
tube I3 by engaging the exterior threads thereof,
and in the other limit, the underneath surface
of the flange 34 of the diopter band 3 I.
surface I9._ ’
The objective 35 of the binocular of the presenty
Furthermore, itwill be obvious that the flange,
if held to a predetermined length, will space the
elements o-f the ocular tube the proper prede
75.
invention is carried by a cell 36 and held in place
on the cell 36 by a bezel ring 31. The cell 36
engages an annular seat 38 formed' Within the
2,409,364
7
8
formed on said body adjacent said open end, said
shoulder comprising a uniplanar surface forming
a reference plane; a flanged cap for closing said
open end; a tubular member formed integral with
said cap; a uniplanar surface on the flange of
said cap adapted to engage the uniplanar surface
of said body when said cap is mounted thereon
for holding the axis of said tubular member nor
mal to said reference plane; a locating surface
carried byv said tubular member; and a locating
surface formed on said body and adapted to en
ing the axis of said tubular member in a prede
termined position relative to a predetermined
axis norma1 to said plane; and a gasket of com
pressible material carried by the end face of
said body, said gasket being compressed when
saidcap is secured to said body with the uni
planar surfaces in facewise engagement.
8. In an instrument of the type described, a
body having an open end; a shoulder formed on
10
said body adjacent said open end, said shoulder
comprising a uniplanar surface forming a refer
ence plane: a cap for closing said open end; a
gage the locating surface of said tubular member
for holding the axis of said tubular member in
tubular member formed integral with said cap;
a predetermined position relative to a predeter
a flange on said cap adapted to circumscribe said
mined axis normal to said plane.
15 body adjacent the open end thereof; a um‘planar
7. In an instrument of the type described, a
surface on said flange adapted to engage the
body having an open end; an exterior shoulder
uniplanar surface of said body when the cap is
formed on said body adjacent said open end,
secured thereto for holding the axis of said tubu
said shoulder comprising a uniplanar surface
lar member in a'prédetermined angular position
forming a reference plane; a cap for closing said 20 relative to said reference plane; and a gasket
openrend; a depending flange carried by said
of compressible material carried by the end wall
cap; a tubular member formed integral with said
of said body, said gasket having a thickness great
cap; a uniplanar surface on the iiange of said
er than the distance between said end Wall of
cap adapted to engage the uniplanar surface of
the body and the interior surface of the cap so
said body when said cap is mounted thereon for
that said gasket is compressed when the cap is
holding the axis of said tubular member normal
secured to said body and the uniplanar surfaces
to said reference plane; a locating surface car
are in facewise engagement.
ried by said tubular member; a locating surface
HENRY F. KURTZ.
formed on said body and adapted to engage the
ROBERT G. MORRISON.
locating surface of said tubular member for hold 30
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