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Патент USA US2505469

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Apri? 25, [email protected]
M. GERARDIN
CAMERA FOR TAKING ULTRA-FAST MOVING PICTURES
Filed May 5, 1947
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2,505,469
Patented Apr. 25, 1950
UNITED STATES PATENT OFFICE
CAMERA FOR TAKING ULTRA-FAST
-1
r
‘MOVING PICTURES
‘1
-
wMaurice Gerardin,lGrenoblel-France, assignor to
" “ Société pour l’Exploitation des'Bre'vets M. 'G. D.,
Grenoble; {France "
’ Application May 5,1947, Serial No. 746,017
1
I -
In France May 214, 1946
-
'
{1 Claims. (01. sir-16$
1
2
with that of the optical axes of the lenses. Yet,
said primary real ‘image may form anywhere else
As a carrier for the movable in cameras de
sighed for the taking " o'i'ultra-fast moving pic;
providedthe optical centres of the secondary
lenses fbelo'cated on the torie surface generated
airesmwhieh the ?lm'isfed through continu
ously/it is well known to use a drum ‘revolved
behind a ?xed primary lens‘, ‘the ?nal image re
sult'ing ‘from the composition of the primary‘ ?xed
image‘ formed by s'a'id‘lens with the secondary
moving image formed‘ by ‘the secondary movable
lensesl' Such a camera is described in my Patent
by the rotation about the axis of the drum of a
sphere tangent to a ‘cylinder having a diameter
No." 2,466,411‘, ‘issued April 5, 1949, entitled: f‘lm
provem'ents in apparatus for’ taking cinemato;
‘ According to a further feature of my invention,
' with the film pressed against the inside of the
g'rapliic'pictures' on continuously fed film.”
'
equal to the mean diameter of the drum and
whose centre coincides with the point where said
primary real image is formed. '
drum by the e?ectof the centrifugal force, the
possibility of esposing any portion of the ?lm
more than once is excluded by the provision of an
'
It is'also known to avail one’s self for the same
purpose of drums carrying several rows of lenses
angularly displaced t'v'i'th respect to one another ‘" opaque drum acting as a mask which vsurrounds
and through each of which a separate image of ‘ the lens-carrying drum and which has an aper
tiii‘e'cut‘therein; said opaque drum is revolved at
the subject to be'photog'raphed is recorded as the
a speed bearing thesame ratio to that of the lens
lens-moves past the ?xed primary lens.
carrying drum’as the angular extent of the aper
5A capital difficulty with such cameras resides
ture to the whole circumference.
in the fact that a certain-parallax exists between
‘ That ‘ embodiment of my camera for taking
the ‘said images, due’ to the lateral o?set existing
ultra-fast moving pictures will be described here—
between the various lens rows. With a View to
mean in which the real image is formed at the
overcome this dif?ciilty cameras have been de
geometrical centre of the lens-carrying drum; the
signed in which the lenses in each row are so
5. latte-rv is ?tted with three rows of lenses and is
' surrounded with an opaque drum revolved at a
arranged» that their optical axes shall converge
on thesubjeot to beiphotographed. This however
involves the necessity of photographing from an
invariable distance fronrthe-‘subject since any
speed’ eight times less, the angular extent of the
deviationfrom the said distance would involve
circumference. 'I-Iowever, it would remain within
aperture therein being 45°, that is, 1/8 of the whole
the scope of the invention to vary the number
of lens rows, the relative speeds of the drums, the
arrangement of the parts or the drum-driving
an increased difference "in‘the parallaxes.
My invention aims at overcoming this diniculty.
It is concerned with’ improvements ‘in cameras
means‘. My invention will be more speci?cally de
for taking ultraefast moving ‘pictures in which
a-rotatabledrum is provided on‘ which several
scribed by having reference to the appended draw
rows‘ OI" lenses angularly offset with respect tonne ‘
another are ‘mounted.
‘
ing ‘which however is‘ given for the purpose of
-' exempli?cation and by no means of limitation.
‘In the‘ drawing:
Figure ‘l is an elevational view of the lens—car
= A first feature of my invention resides therein
that a ?xed lens system is provided that spans
the total width of v"said rows, the purpose of the
rying
drum;
‘‘
"
'
‘
'
"
primary image'formed bye-said ?xed lenssystem
Figure 2 is an elevational and partly sectional
view of an apparatus ‘according to my invention,
which may be constituted by one single lens or by
the section through the lens-carrying drum being
movablellenses being to photograph the single
in
as many lenses as movable lens rows are pro
taken on line II—II in Fig. 1 for the sake of con
vided.
venience in the description;
Figure 3 is a perspective view of the two drums
of the camera, the outer casing being removed
for the sake of clearness in the drawing.
In the drawing, I designates the primary ?xed
lens, 2 the drum that carries the movable lenses
3, 4 the opaque drum surrounding the drum 2, It!
the aperture in the said opaque drum and ‘l the
casing of the camera closed by its removable lid 8.
A further feature of my invention resides in
the fact that the secondary lenses are so mounted
that their optical axes meet at the centre of the
primary real image. Where the said primary real
image is formed at the geometrical centre of the
drum, that is, where its centre coincides with the
point of intersection of the optical axis of the
?xed primary lens with the axis of rotation of the
drum, the optical centres of the movable lenses
Prior to photographing a ?lm band 9 indicated
in chain lines in Fig. 2 and whose length is equal
both with the aforesaid point of intersection and 55 to the circumference of the inside of drum 2 is
are to be located on a zone whose centre coincides
2,505,469
4
inserted in the latter; due to the rotational move
ing pictures, in combination, a rotary drum, a ?lm
ment imparted to the drum the ?lm band is
band arranged within said drum, a plurality of
pressed against the inner periphery of the drum.
lenses mounted in rows on said drum, and a pri
For the sake of simplicity the various lenses
are represented diagrammatically by simple bi
mary lens system arranged in front of said drum
and cooperating with the said secondary lenses,
the ?eld of the primary lens system covering the
convex lenses; it is to be understood that they
may be replaced by any other lens commonly used
in cinematographic cameras without thereby de
parting from the scope of the invention.
The operation of the camera can thus be un
derstood easily. Once said camera is aimed at
the subject to be photographed and the drum
driving motor 5 is started and is running at the
total width of the secondary lens rows carried
I by said drum, to form a primary real image of
the subject to be photographed, the centers of the
10 secondary lenses being located on a tore gener
ated by the rotation about the axis of the drum of
a sphere which is tangent to a cylinder having as
diameter the mean diameter of said drum and
whose center is located at the point Where the
desired speed, the shutter 6 is opened for no more
than the time taken by drum 4 to accomplish one
real image is formed, and said real image being
full revolution, which corresponds to eight rev
intercepted by the secondary lenses and projected
olutions of the lens-carrying drum 2. A mech- ' thereby upon the ?lm.
anism of conventional type (not shown) is pro
3. In a camera for the taking of ultra-fast mov
vided to exclude the possibility for the shutter 6
ing pictures, in combination, a ?rst rotary drum,
of opening or closing during the time the aper
a ?lm hand arranged within said ?rst drum, a
ture in the opaque drum 4 is moving past the ?xed 20 plurality of lenses mounted in rows on said ?rst
lens I.
drum, a primary lens system arranged in front of
As the aperture ill in the opaque drum sweeps
said ?rst drum and cooperating with the said
the space behind the ?xed lens the image formed
secondary lenses, the ?eld of the primary lens
by the latter is intercepted successively by a lens
25 system covering the total width of the said sec
in each row.
ondary lenses, a second rotary drum acting as a
It follows that during the time the ?eld of
mask surrounding the said ?rst drum in coaxial
the ?xed lens I is cleared by the aperture Hi the
relation therewith, and an aperture provided in
lens-carrying drum will accomplish one complete
said second rotary drum, the ratio of the periph
revolution and that consequently the ?lm band
eral angle of said aperture to the circumference
9 within the camera will be exposed over the 30 being equal to the speed ratio between the two
whole length of the same.
drums.
As already pointed out, the lens system may be
ll. In a camera for the taking of ultra~fast mov
composed of as many ?xed lenses as rows of sec
ing pictures, in combination, a ?rst rotary drum,
ondary lenses are present on the drum.
a ?lm band arranged within said ?rst drum, a
Moreover, it is by no means necessary that 35 plurality of secondary lenses mounted in rows on
the primary real image should form at the geo
said first drum, a primary lens system arranged
metrical centre of the drum, since it may be
in front of said ?rst drum covering the total width
formed at any other point provided the secondary ,
of the said secondary lenses, a second drum act
lenses have their optical centres located on a toric
ing as a mask surrounding the said ?rst drum in
surface generated by a sphere tangent to a cylin
coaxial relation therewith, an aperture provided
der having a diameter equal to the mean diameter
in said second drum, the peripheral angle of said
of the drum and having its centre located at the
aperture being equal to the speed ratio between
point Where the primary virtual image is formed.
the two drums, and a shutter arranged between
What I claim is:
said primary lens system and said second drum.
1. In a camera for the taking of ultra~fast mov
45
MAURICE GERARDIN.
ing pictures, in combination, a rotary drum, a
?lm band arranged within said drum, a plurality
REFERENCES CITED
of lenses mounted in rows on said drum, and a
The following references are of record in the
primary lens system arranged in front of said
?le of this patent:
drum and cooperating with the said secondary 50
UNITED STATES PATENTS
lenses, the ?eld of the primary lens system cov
ering the total width of the said secondary lenses
Number
Name
Date
and adapted to form the primary real image at
1,488,542
Heape et a1. ______ __ Apr. 1, 1924
the geometrical centre of the drum, the centers
1,520,559
Buchner _________ __ Dec. 23, 1924
f the movable secondary lenses being located
2,088,536
Ryland __________ _- July 27, 1937
on a spherical zone whose centre is located on the
2,259,228
axis of rotation of the drum, and the said real
image being intercepted by the secondary lenses
and projected thereby upon the ?lm.
2. In a camera for the taking of ultra-fast mov
so
Number
238,973
Rankin __________ __ Oct. 14, 1941
FOREIGN PATENTS
Country
Date
Great Britain _____ __ Sept. 3, 1925
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