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Патент USA US2135996

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Nov. s, 1938.
Filed Aug. 11, 1936
Patented Nov. 8, 1938
Donald L. Wood, Rochester, N. Y., assignor, by
mesne assignments, to Eastman Kodak Com
pany, Jersey City, N. J., a corporation of New
Application August 11, 1936,’ Serial No. 95,379
4 Claims. (01. 88-24)
This invention relates to motion picture pro
jectoraand more particularly to the cooling and
ventilating of the lamphouse thereof.
20 is looped at ‘2i and 22 on'opposite sides of the .
?lm gate, and is fed to the'loop 2i by means of
a continually rotating sprocket 28, which draws
One object of the invention is to provide a new
the ?lm 20 from a supply reel 25, ‘rotatably
mounted on the spindle 26 carried by the up- 5
and improved lamphouse arrangement in which
the heat radiated by the lamp ?lament is readily
and effectively removed from the lamphouse.
wardly projecting arm 21. -
fere with the free flow of cooling air there-‘
through. 'A further object is to provide a lamp
house of this class in which the hottest portion
of the lamp is in the section of highest air ve
locity so as to be effectively cooled thereby. Still
another object is to provide such a lamphouse in
in which the streams of cooling air ?ow in the
same direction as the natural air movement, thus
effectively cooling the lamphous and ventilating
A still further object is to provide
such a lamphouse arrangement which‘ is simple
in construction, relatively inexpensive to manu
facture, and highly effective when used.
To these and other ends the invention resides
25 in certain improvements and combinations of
parts, as will be hereafter more fully described,
the novel features to be pointed out in the claims
at the end of the speci?cation.
In the drawing:
Figure 1 is a side elevation of a motion pic-_
ture projector equipped with a lamphouse con
23, moves the ?lm 20 from the loop 22 to a takeup
reel 35 rotatably-mounted on a'spindle 36 car
10 is exterior of the lamphouse so as not to inter
20 the same.
A second sprocket 30, similar to the sprocket
Another object is to provide such a lamphouse
in which the lamp holding or supporting member
ried by the arm 31. The takelup reel is operated 10
by means of a power driven belt 38 which is con
nected to a motor, not shown, positioned within
‘a housing i2, as is well known.
The above described mechanism, with the ex
ception of the lamphouse it, may be of the usual 15
or any construction well-known to those in the
art, and does not constitute a part of the pres
ent invention.
_ ;
Referring now to Figures 2 and 3"wherein is _
shown a lamphouse l5 constructed in accordance 20
with the preferred embodiment of the invention.
This lamphouse comprises, in general, a sub
stantially vertical tubular member of fluid con
duit having an enlarged lower end 40 which
forms a fan casing or scroll, an intermediate con- 25
verging section 42, and a ?ared out discharge
opening 43, all will be hereinafter more fully de
scribed: It is apparent from an inspection of
Figure 3 that the upper portion of the lamp
house constitutes a substantial Venturi nozzle of 30
which ‘the converging section 42 is the throat
throat 42 is formed with laterally extend
Figure 2 is a side elevation of the preferred ingThe
tubular sleeves l5 and 46 which are in optical
35 type of lamphouse.
alignment with the front lens barrel 48 of the as
Figure 3 is a vertical sectional view of the projector; and in which are respectively mounted,
lamphouse taken substantially of the line 3—3 in
the manner shown, a re?ector 50, and a rear
of Figure 2.
lens barrel ii in which are suitably secured the
Similar reference numerals throughout the lenses 52. The re?ector I0 and the lenses 52
40 several views indicate the same parts. »
provide means for directing light rays from a 40
A lamphouse constructed in accordance with source of illumination, such as the lamp 55,
thepresent invention is herein illustrated as ap
through an image on a ?lm 20, and then through
plied to a motion picture projector having a base suitable lenses in the front barrel 48 to an image
Ii which supports a motor housing l2. the ?lm ' receiving screen.
45 operating mechanism which is enclosed in a
suitable housing It positioned above the motor such, for example, as the electric lamp 5!, is 45
housing i2, and a chamber it in which the'lamp
used, a large amount of heat is radiated into the
house, generally indicated by the numeral I! and lamphouse.
In order to protect the various parts
hereinafter more fully described, is positioned.
of the projector, it is highly essential that this ,
The operating mechanism may be of the’usual heat be readily and effectively carried away or 50
and well-known construction driven by power , dissipated as fast as radiated, for obvious reasons.
through a motor positioned in the housing i2, Such heat is usually carried away by means of a
and consisting of a pull-down claw, not shown,’ stream of cooling air which flows through the
for intermittently moving a ?lm 20 past a ?lm
66 gate through which light may pass. The film lamphouse and over the lamp itself to cool the
latter'and to remove the heat radiated thereby. 55
structed in accordance with the preferred em
bodiment of the invention.
It is well known, however, that the most effec
tive air cooling is secured when the coolest air
is directed into intimate contact with the hottest
portion of the object'tc be cooled; and when the
free passage of the air over the object is not ob
structed nor de?ected by various objects such,
for example, as the lamp supporting socket or
In prior lamp lamphouse constructions, the
10 cooling air ?rst contacts the base of the lamp,
and, after being somewhat raised in temperature,
it ?nally reaches the hot ?lament area of the
lamp. Furthermore, the lamp socket is usually
positioned directly in the path of the ?owing air,
and thus de?ects the latter so as to cause eddy
current, thus not only materially reducing the
cooling effect of the air, but also decreasing the
fan efficiency.
The present invention overcomes these objec
20 tionable features by placing the lamp supporting
socket outside of the lamphouse proper, and by
inverting the lamp within the lamphouse so that
the lamp extends directly into the path of the
cooling air, thus bringing the hot ?lament area
25 of the lamp into the direct path of the coldest
air, as will be apparent from inspection of Fig
ures 2 and 3.
In the speci?c embodiment of the invention,
the lamp 55 extends downwardly through the
?ared-out discharge opening 43, and has the axis
thereof in substantial alignment with the vertical
axis of the Venturi nozzle. The ?lament area 55
of the lamp is arranged within the converging
section on throat 42 of the lamphouse, and in
35 alignment with the optical axis of the re?ector
50 and the lenses 52. The lamp is connected to
and supported by a suitable receptacle or socket
60, which is arranged above and exteriorally of
and ventilate the latter. -By reason of this
stream-line ?ow, not only is more effective cool
ing secured, but the fan efficiency is also thereby
As pointed out above, the upper portion of the
lamphouse is in the form of a Venturi nozzle, sec
tion 42 of which constitutes a Venturi throat.
Such a throat provides a means‘ for converting
a portion of the static head of the air leaving the
fan into velocity head so that the velocity of the
air streams passing through the throat 42 is there
by greatly increased. As the ?lament area 55 of
the lamp is substantially concentrically posi
tioned within the throat 42, it is obvious that the
high velocity air streams will readily and e?ec
tively carry away the heat radiated by the lamp
?lament. The static head of the air is substan
tially restored by reason of the ?ared out dis
charge opening 43, as is well known by those fa 20
miliar with the art.
The entire lamphouse l5 may be suitably se- -
cured in vertical position within the chamber l4,
in any well-known manner. To permit replace
ment of the lamp 55, as well as the cleaning of 25
the optical members 50 and 52, a portion of the
lamphouse i5 is preferably secured to and mov
able with the door 64. In the present embodi
ment, the lamphouse is split along the line 50 to
form a narrow side portion ll, ‘see Figure 2,
which is rigidly secured to and movable as a unit
with the door 64. Rivets or other securing
means 85 are provided for mounting the portion
8| on the door 54, as clearly illustrated in Figs.
1 and 2.
It is also apparent from an inspection of Fig
ure 2, that when the door 64 is swung open, the
lamp 55 as well as the portion ll are moved into
house, as will be apparent from an inspection of
the position shown by the dotted line, thus fa
cilitating the replacing of the lamp 55 and/or the 40
cleaning of the optical members 50 and 52.
Fig. 3.
In the preferred embodiment, the socket 80 is
full line, the portion ll abuts the lamphouse l5
the lamp house and out of the direct path of the
40 streams of cooling air ?owing through the lamp
preferably mounted on and supported by an L
45 shaped bracket 6|, the shorter leg 52 of which is
‘secured by rivets or other fastening means 63 to
the door 64'0f the chamber l4. The door 64 is
hingedly connected along the line 65 to the lamp
house, so that the door may be swung to open
line relation through the entire lamphouse to cool
position to permit removal and replacement of
the lamp 55, as well as cleaning of the optical
members 50 and 52, all as will hereinafter be more
fully described. The socket 55 is connected to a
suitable source of electrical current, not shown,
55 by which the lamp ?lament 56 may be illuminated
to project the image on the ?lm 20, as is well
known to those of the art.
A continuous supply of cooling air is provided
by a fan 58 rotatably mounted on a shaft 59 in
60 the fan casing 40. This fan forces streams of
cooling air upwardly through the lamphouse and
over the lamp 55 to effectively cool the latter, as
well as. the adjacent optical members. This fan
is operatively connected to and driven by a motor
within the housing i2. Air is admitted to the
fan through grilles 10 at the bottom of the cham
ber l4 as clearly illustrated in Figure 1.
When, however, the door is closed, as shown in
along the line III to forman air tight connection
therewith. A small knob 85 permits easy open 45
ing of the door.
It is apparent from the above description that
by inverting the lamp 55, not only are obstruc
tions entirely eliminated within the lamphouse so
that the air can pass therethrough in de?nite
stream-lines; but also the coolest air ?rst engages
the hottest portion of the lamp, thus insuring
the maximum cooling effect. Furthermore, the
movement of the cooling air is in the direction of
the natural air movement through the lamphouse
‘thus assisting in the proper ventilation of the
‘While one embodiment of the invention has
been disclosed, this is by way of illustration only,
as it is understood that the inventive idea may
be carried out in a number of ways. This appli
cation is, therefore, not to be limited to the pre
cise details disclosed, but is‘ intended to cover all
modi?cations and variations thereof falling with
in the spirit of the invention and the scope of the
appended claims.
I claim:
Referring now to Figure 3, it is apparent that
‘when the lamp is inverted so as to extend down
70 wardly into the lamphouse, the cooling air ?rst
1. In a motion picture projector, the combina
tion with a chamber, of a lamphouse positioned
within said chamber and comprising a ?uid con
duit, means for forcing strea ‘of cooling ?uid
is also apparent that by placing the light sup
porting socket 60 outside of the lamphouse, no ob
structions are present in the path of the air, so
75 that the latter may travel in substantially stream
upwardly through said cond?, a door opera
engages the hot ?lament area 55 of the lamp. It
tively connected to said chamber, a lamp sup
ported on said chamber and inverted within said
conduit and in the path of said streams so as to 75
be cooled thereby, and a part or said conduit ad
jacent said lamp secured to' and movable as ‘a
unit with said door to facilitate replacement or
said lamp.
2. In a motion picture projector, the combina~ ‘
tion with a chamber, of a lamphouse positioned
connected to said chamber, an inverted lamp in
cluding a ?lament area mounted on said door ex
teriorly of said conduit and extending downward
ly into said nozzle and with the ?lament area
thereof in said throat whereby said area is cooled
within said chamber and comprising a ?uid con
by said high velocity streams, and a part of said
conduit adjacent said throat secured to and
duit, means foryforcing streams of cooling ?uid
movable with said door to facilitate the replace
upwardly through said conduit, a door hingedly
ment of said lamp.
10 connected to said chamber, a lamp inverted with
in said conduit and in the path of said streams
so as to be cooled thereby, lamp supporting
means mounted on said door, and a portion 01'
said conduit adjacent said supporting means
15 mounted on and movable with said door to facil
4. In a motion picture projector, the combina 10
tion with a chamber, of a lamphouse within said
chamber and comprising a stream-line ?uid pas
sageway, a lamp within said lamphouse and po
sitioned in said passageway and including a ?la
ment which heats a portion 'of said lamp to a 15
itate replacement of said lamp.
3. In a motion picture projector, the combina
high temperature, a restricted area in said pas
sageway surrounding the ?lament section of said
tion with a chamber, of a lamphouse positioned
within said chamber and comprising a ?uid con
lamp, a fan rotatably mounted in said lamphouse
to force streams of air through said passageway,
a door operatively connected to said chamber, 20
20 duit, a converging portion between the ends of
said conduit to form a Venturi nozzle having a
throat, a fan for forcing streams of cooling air
through said nozzle, said throat providing a sec~
tion'of high velocity streams, a door hingedly
and lamp supporting means mounted on said
door and movable therewith to move said lamp
into and out of projecting position.
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