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Патент USA US2411777

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Nov; 26, 1946.
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G. K. ,CZARNIKOW
7
2,411,777
IRIS DIAPHRAGM MECHANISM FOR PROJECTION LENSES
Filed Sept. 28,‘ 1944
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2,411,777
Patented Nov. 26,1946
i UNITED STATE s
PATENT OFFICE '
2,411,777
IRIS DIAPHRAGM MECHANISM FOR
PROJECTION LENSES
N. Y., assignor
George K. Czarnikow, Rochester,
Company, Rochester,
to Wollensak Optical’
N. Y., acorporation of New York
Application September 28, 1944, Serial No. 556,120
2 Claims. (01. 95-64),
1
a
for holding the usual lens system at the rearend
This invention relates -to an iris diaphragm
mechanism for a projection lens and has for its
purpose, to provide a projection lens mount with a
of the barrel,
It has been found desirable to mount an iris
diaphragm adjacent to the rear lens system and
to control the diaphragm from a position at the
front of the barrel adjacent to the front vlens
commercially practical and simple iris diaphragm
and controlling means for regulating the intensity
mount to be described presently, and according
to the present invention, this objective is attained‘
by providing an iris diaphragm indicated at 5 and
preferably positioned immediately in front of the
of light in a projection lens.
. A more particular purpose of the invention is
to, afford anre?icientand durable diaphragm op
erating means which can be quickly and eco
nomically assembled in’ aprojection lens mount
and easily adjusted to‘regulate the size of the
light opening, -
»
'
10 rear lens system. The diaphragm 5' is of conven
tional form and includes a control ring 6 suitably
connected to the movable leaves ‘of the diaphragm
h
- A further object of the invention is to provide
and rotatably arranged on the cylindrical support
‘I that is spaced from the wall of the barrel and
diaphragm adjacent to the rear lens mount of a 15 forms part of a mount 8 supported within the
projection lens system and to control the dia
barrel
place byI the
against
threaded
a shoulder
fasteningxring
9 and held
Hi. ?xedly
In order
phragm from a position at the front of the lens
barrel adjacent to the front lens of the system.
to position the cylindrical support ‘I properly
Another purpose of the invention is to afford a
within the barrel when assembling, the flange 8
construction in which the front portion of the 20 is slottedto engage a projection on a positioning
anjarrangement makingit possible to position a
operating member is spaced substantially end
wise from. the ‘rear portion thereof and from vthe
diaphragm, while being held ?rmly in proper
rotativelyadjustable relation to the frontlen-s
so asto permit easy movement, quick adjustment,
and accurate control of the diaphragm.
-
Still an additional object of the invention is to
provide a construction that utilizes a minimum
number of parts and can‘be. economically manu
factured, while lending itself also to an easy and
accurate assembly.
‘To these and other ends, the invention consists
in the construction and arrangement of parts that
screw I I secured in an opening in the lens barrel.
The control ring 6 of the diaphragm is con~
nected by’ means of a pin l2'to a rear cylindrical
portion 13 of an operating member, said - rear
25 cylindrical portion being slotted endwise to en
gage .thepin 12 while the cylindrical support ‘I is
slotted annularly to permit the movement of the
[2 necessary to effect turning of the control
' pin
30 ring 6 and opening orclosing of the diaphragm.
The operating member includes the previously
mentioned cylindrical rear portion 13, a cylindri
I cal front portion [4, and a tapered sleeve-like
body l5 which is connected to the cylindrical front
will appear clearly from the following descrip
portion M by means of a ?ange or shoulder is.
tion when read in conjunction with the accom 35 The cylindrical front portion M of the oper
panying drawing, the novel features being pointed
ating member is seated against a corresponding
out in the claims at the end of the speci?cation.
cylindrical surface formed in the barrel, which
In the drawing:
'
,
'
Fig. 1 is a side elevation of a projection lens
mount, incorporating an irisv diaphragm and oper
ating means constructed in accordance with a
40
has a shoulder l1 against which engages the flange
or ‘shoulder [B of the operating member to limit
endwise movement of the latter, in one direction.
Movement of the operating member forwardly is
limited by the attaching portion [8 of the front
lensamount which includes a lens supporting por
-Fig. 2-is a longitudinal sectionalview of the
tion [9 that is spaced from the wall of the barrel
same, and
_ _
45 and overlies the front cylindrical portion 14 of
Fig. 3 is a transverse vertical sectional view on
the operating member, and receives the front
preferred embodiment. of the invention; ‘
the line 3-3 of Fig. 2.
lens 20.
The lens is held in place by the threaded fas
ring 2|, and the mount is held in place
parts throughout the several views, I designates a 50 tening
by the attaching portion 18 which is threaded .
lens barrel adapted to be positioned in an opening
exteriorly to engage the barrel and interiorly to
of a projection apparatus with the shoulder 2
‘ receive the fastening ring 2 I. >With this arrange
Referring more particularly to the drawing, in _
which like reference numerals refer to the same
against the front wall surrounding such opening,
as usual with the conventional projection lens
ment. the front cylindrical portion M of them»
erating member is properly supported and guided
assembly, while 3 designates the rear lens mount 55
2,411,777
for uniformly smooth rotative adjustment be
tween the cylindrical supporting surface of the
at the front of the barrel of larger diameter than
the rear lens mount, of an iris diaphragm located
barrel and the cylindrical lens supporting por
in front of and adjacent to said rear lens mount
tion IQ of the front lens mount, affording a
smooth action of the operating member and ac 5 and including a control ring, the diaphragm be
ing approximately the same diameter as the rear
curate, easy control of the diaphragm, while the
lens mount and of less diameter than the front
parts are held with su?icient tightness to prevent
lens mount, an operatingmember independent
excessive loos'eness or play while permitting the‘
of the diaphragm and including a cylindrical
required movement for adjustment.
rear portion surrounding said control ring, a pin'
The operating member is turned by means of
carried by the control ring, said cylindrical rear
an adjusting ring 22 that is rotatable on the bar
portion of the operating member having a lon
rel and to this end engages a threaded portion
on the exterior of the barrel at a point surround
gitudinal slot engaging said pin, the operating
member also including a cylindrical front por
is provided with a pin 23 extending through an,
tion of greater diameter than said rear portion
and rotatably supported on the interior of the
arcuate slot 24 in the lens barrel and having its
barrel adjacent to said front lens mount, an ad
inner end engaging a longitudinal slot in the
justing ring threaded and rotatable on the ex
front cylindrical portion [4 of the operating
terior of the barrel around the front lens mount
member. The adjusting ring 22 carries suitable
indicia on the bevelled edge 26.! for cooperation 20 and having a pin extending through an opening
in the barrel, said cylindrical front portion of the
with the index 25 to enable positioning it and
operating member having a longitudinal slot en—
to indicate the selected position of the diaphragm,
gaging said pin, and an elongated tapering sleeve
which can thus be adjusted to any degree of
portion connecting said cylindrical front and rear
opening by turning the operating ring 22.
This effects corresponding turning of the front 25 portions of the operating member.
2. In a projection lens, the combination with
cylindrical portion Hi, the connecting sleeve-like
an elongated lens barrel, a rear lens mount at
body !5, and the rear cylindrical portion [3 which
the rear of the barrel, and a front lens mount
in turn rotates the control ring of the diaphragm
at the front of the barrel of larger diameter than
and opens or closes the leaves of the latter. The
rear edge of the adjusting ring 22 is spaced some— 30 the rear lens amount, of an iris diaphragm located
in front of andadjacent to said rear lens mount‘
what forwardly of the shoulder 2 to afford clear
and. including a control ring, the diaphragm be
ance between the adjusting ring and the adja
ing approximately the same diameter as the rear
cent surface of the front Wall of the projection
lens mount and of less diameter than the front
apparatus to permit the necessary turning of the
adjusting ring on the lens barrel for controlling 35 lens mount, a mount for said-diaphragm attached
the diaphragm.
to the barrel and including a cylindrical sup
port'for the control ring spaced from the wall
With this arrangement, the diaphragm can be
of the barrel, he control n'ng being seated and
located at the rear of the barrel immediately ad
rotatable within said cylindrical support, an op
jacent to the rear lens system and adjusted from
ing the front lens mount. The adjusting ring 22
a position at the front of the barrel, forwardly
erating member independent of the diaphragm
regulated by adjustment of the diaphragm, the
slot engaging‘ said spin, the operating _memb‘er
40
and including a cylindrical rear portion sur
of the front wall of the projector apparatus, and
rounding and rotatable on the exterior of said
surrounding the front lens mount, and the ar
cylindrical support, a pin carried by the control
rangement is such that the parts are securely
ring and extending through an opening in said
held against excessive play and in a manner that
cylindrical support, said cylindrical rear portion
insures a free, easy adjustment of the diaphr agm
45
of the operating member‘ having a longitudinal
at all times, and while the light intensity can be
also including a ‘cylindrical front portion of
location and arrangement of the operating mech
greater diameter than said rear portion and ro
anism is such as not to interfe're‘with the nor
mal passage of light from the rear lens system
tatably supported on the interior of the barrel
to the front lens system so that there is no result 50 adjacent to and surrounding a portion‘ of said‘
ing loss of light efliciency‘ from the combining
of the diaphragm controlling mechanism- with
the projection lens.
While the invention has been disclosed herein
with reference to a particular embodiment, it is
not con?ned to the details or arrangement set
forth, and this application is intended to cover
front lens mount, the barrel having an interior
shoulder against which the rear edge of said'cy
lindrical front‘ portion of the operating member
is seated while the front edge of said cylindrical
front portion is retained by the front lens mount,
an adjusting ring’ threaded and rotatable ‘on the
exterior of the barrel around the front- lens
such modi?cations or changes as may come with
mount and having a pin extending through- an
in the purposes of the improvement and the scope
opening in the barrel, said cylindrical front por
of the following claims.
'
I claim:
1. In a projection lens, the combination with
an elongated lens barrel, a rear lens mount at
the rear of the barrel, and a front lens mount
60 tion of‘the operating member having a longitudi
nal slot engaging said pin, and an elongated‘
tapering sleeve portion connecting thev front and
rear cylindrical portions of the operating mem
ber.
GEORGE K. CZARNIKOW;
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