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Патент USA US3100433

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Aug. 13, 1963
Filed Nov. 14, 1960
I5 Sheets-Sheet 1
Aug. 13, 1963 -
Filed Nov. 14, 1960
3 Sheets-Sheet 2
In v5 mark
Aug. 13, 1963
Filed Nov. 14. 1960
3 Sheets-Sheet 3
45 ‘
45 39
UnitedjStates PatentfO " ice.
Patented Aug. 13,‘ 1963
ginal ?ange portion 28 at its upper end-which rides on a
plush orieltannular gasket 29 that seats in an annular
groove in the upper face of the setting knob 22. The
upper face of the clutch member 26 :is milled out at op
posite sides-of its axis, as denoted at 30' and ‘3:1 in FIG.
' Johannes G‘. Padelt, Rochester, N.Y.,.assignor to Grades,
Inc., Rochester, N.Y., a corporation of Delaware 1
,j ' Filed N‘ov.'14,,1960, seem. 69,071
‘' l. “ ‘I.
9 Claims.
(Cl."‘95"-—1‘0)‘ ‘
3, ‘to-provide .‘ upwardly projecting key portions 32 by
means of'which the clutch member 26 is keyed to cam
20. . The .key portions '32 project radially inwardly and
The presentinvention relates to photographicyjcamerasgj ' engagein notches 33 formed in the upper end of the hub
and more ‘particularly! to photographic cameras having’a v10 19 or cam 20.,
built-in ‘exposure ‘meter for controlling the exposure aperi v1' ‘ Secured to the upper end of the post 18 as by means
of a screw 35 is a clutch release disc‘36. This disc is
ture or diaphragm opening‘. More speci?cally,» the‘ inven
ti-on relates to a- camera having‘ a‘ built-in exposure meter, ‘ '
knurled on its upper face around its marginal edge as de
where ‘the exposure meter is used in manually setting the
noted at 34; and it has anarcuate, marginal, depending
diaphragm aperture by adjusting the diaphragm to match 1,5 rim 37 which engages in a correspondingly-shaped arou
ate groove in the clutch member 26. Opposite ends of
the arcuate
37, whichgare denoted at 38 and‘ 39, re;
spectively, in FIG. 3, are spaced angularly‘ from'one
the'plosition of the needle of the exposure meter. ; ' T
. “For ‘top-‘quality photography,‘ consideration should
always“ be given to the'?lm speed when taking pictures.
Different types of ?lm have differentspeeds and are given
di?ereritstandard ASA- rratings. For proper control. of
The clutch member 26 has a‘ peripheral surface: 40'
the diaphragm aperture, therefore,
a camera, which is - ' which is cylindrical lfor the greater part of its extent, but
which is formed arounda portion thereof with an arcuate.
equipped with a built-in exposure meter, means should be
provided for adjusting the diaphragm aperture relative to
'cam surface 41. Disposed between the cam surface 41
of the member 26 and the confronting internal surface
speed to ?lm of another speed, thereby to‘ compensate 25 43 of the setting knob .22 are two cylindrical ‘rollers 45‘,
/ a which are constantly urged apart by the downturned, free
for the ?lm speed of thei?lm 'to‘be'used.
the exposure meter, when changing‘?lm from ?lm of one
The ‘primarylobject' of the present invention is topro- 2
vide manually operable means which can be located con
veniently on a'carnera, for adjustingthe diaphragm aper- .
' tu‘re' relative‘toithe exposure‘meter off the camera to com; 30
' Another‘ objectiof the invention is to provide manual;
lyadjustablémechanismi of the character :described which
will'be simple in construction, relatively inexpensive, and
which lwill-i‘permitireadily and easily adjusting. the dia
phragmopeningi‘for ditferent'rAsA ?lm'ratings. ~
millcdeout portions 31} and '31. ‘It straddles the hub‘ por
tion 19 of cam 20.; Its bight portion seats against the
inside wall of rim 37 of release ‘disc 36; and itsvfrce ends
are disposed
space between cam surface 41 of disc
. 2,6 and the opposed surface 43‘ of setting knob‘ 22. The
free ends of the spring tend constantly to urge the rollers
pensate for change in speed of the type of?lrn used in the
ends Off a U-shaped spring I27. The spring 27‘is disposed ‘
in. the upper recessed portion of the disc 26' above its
35 ‘45 apart to wedge them between the surface 43‘ of the
setting knob 22 and the opposed surface ‘41 of the clutch
member 26, thereby frictionally coupling the member 26
‘ ‘vOther objects of ‘the invention willsbc apparent herein+
after ‘fromthe speci?cation and‘ from the recital of the
to the setting knob 22.
‘appended claims,‘ particularly‘ when‘ read in' conjunction
with ithe'accompanying drawings;
In‘the drawings:
i. 4
_ Engraved-on the upper face of the'?ange 28 of the
‘clutch ‘member 26 is ‘an ASA scale graduated for ?lm
speed. Engraved on the upper race of the setting knob
22 is an index point 44- which reads against‘ this scale.
By holding the setting knob 22 in place and turning the
rFIG-f'l ‘is :'a fragmentary sectional; view of a camera '
release member 36, or vice vcrs-a, one end 38 or 5-9‘ ofthe
havingia. built-in exposure meter‘ and equipped with ap
paratus “constructed "according ‘to; one embodiment of .tliis 45 rim 37 of the release member 36, depending upon‘ the di- ‘
‘ invention‘ for manually: adjusting the diaphragm aperture
g ‘relative‘ to the‘ exposure meterto‘compensatev for ,the'?lm
speedi‘ofithe ?lm whichj-istobeused in .theYcam'era; 1 "
isja section on the line z-znrrio. Hooking
directiongof the"§3.?1'\I“0WS;,.»v 1i.
' '
‘rection of rotation, will force one of the rollers 45 out.
of its'locking position against the resistance‘ or spring 27,
and, operating through that roller andyth‘e spring, will
cause the ‘clutch member 26 to be turned, thus changing
the, ‘position- of the index point on the setting knob 22
relative to the ASA vscale on, the clutch member 26.
" By releasing the coupling, then, the positions’ of the
index point and the ASA scale relative to each other can
FIG; .3? is a ‘fragmentary sectionhon , the-line» 3-3‘, hr ‘
rFIQ-l‘looking inthei-directionoiflthe arrows; and
V, ‘j
- P‘FIGL 4-isv a diagrammatic view illustrating" the opera
iti'onof the apparatus of this invention. .
j ‘Referring ,nowgtoithe drawings ._ by numerals
of- refer
‘be changed; in conformity with the ?lm speed of the ?lm
55 vinthe camera.
Sincethe two rollers 45 work in opposite
directions, the release ‘knob 36 can be turned in either
.:ence,- 10“ ,(FIG; 1), :denotes ‘thegtop- ‘ ‘cover’ ofj ‘a camera;
.111‘ ‘.rlesigrmles;the-j1v camera- 'body; and #12 the camera '
direction to line up any.v ASA graduation with the‘ index
chassis. Mounted on the chassis f1-2_;b.y meansgof: screws
14 is a right angular shaped bracketi1v5_;. Rivetedtogthe
‘point. The coupling of the clutch member 26 to the set
.tingknob 22 will be effected automatically under action
lproje'cting-endof thisbraclcetis aipost l8; Journaled
60 of the spring 27, as soon as the release knob ‘36 is
non-the post 18‘‘ is agcam 20"whpsehu'b portion 19‘ sur-.
~ roundsthe post. ' The cam is atacercam and is provided' “
- on its bottom 'sideiacejwith a>spiral cant groove '21. .. .
A pin or follower 5%} rides in the cam groove 21 of the
cam 20. This pin or follower is carried by a bell crank
-_ 1 Rotatablypmountedi aroundv the hub ‘portion ‘119'. of. the
;cam‘20 isfaisetting knob 221 . _-"I»‘his knob isknurled, as
(denoted at 23,.v around the upper portion ofrits periphery. 1
lever 51_ which is pivoted‘intermediate its ends by means
‘ spur gear teeth24. The upper face/of theknob 22 is re
. cessed to-receive awasher 25 and a rotary clutch mem
to a stud 58 which is fastened rigidly to the housing of an
exposure meter 6% that is mounted within the camera.
651 of a pin 52 on the bracket 15.’ At its opposite end, the bell
' crank carries a pin 54 which engages in a slot 55 in a ‘split
~ It is formed around thelowerpart of its periphery with ‘ clamp member 56 that is secured by a bolt 57 around‘ and
ber 126. The clutch member 26 seats on washer 25‘ and 70 A coil spring 53, which is. wound around pin 52, and
is recessed on’ its upper face to receive a generally
which bears at one ‘end against pin 50 and at its opposite
"Ill-shaped spring 27. The clutch‘member‘ 26 has a man“
end against the housing of the exposuremeter, serves to
ring ‘82 will remain stationary'since diaphragm setting , v
knob 22 is uncoupled from coupling member 26. ,Thus,
the rotary position of the exposure meter'will be changed
' maintain the pin 50 in engagement with one side of‘the
cam slot 21, and to take up any backlash between the pin
and the cam slot.
The exposure meter may be of conventional construc
tion, containinga photoelectric cell and a‘ galvanometer
relative to the‘ diaphragm aperturelto conform to they .
?lm speed of the ?lm to be used in the camera.
operated by that cell, and maybe mounted in the camera
As soon as the release knob-136 is released,‘ though,
the, spring 27 will force the rollers/t5 back into coupling
by means of’the end plate v62 and the screws 63 which
fasten the end plate to the bracket 15. Secured to the i
position to again couple cam ‘20' to1_the exposure knob 22 ~
galvanometer shaft at the end opposite where. clamp 56
through coupling member v26‘ and‘r'ollers 45,.therebycou
'is secured to the galvanometer housing is a pointer 70. 10 pling'the diaphragm ,to'_ the exposure meter againv so that
the diaphragm aperture will again be adjusted ‘with the_ex-' ‘
The'pointer 70 is positioned to be viewed through aprism
p'osure meter when the’knob 2121s adjusted to rotate, the j
72 forming‘ part of the view?nder system of the‘car'nerra.
galvanometer until‘ its pointer 79» reads at'zero againsttthe
In the camera illustrated,.the prism 72, or a viewing'screen ’ v
behind the prism, has ‘an index mark on it as denoted at a
"zerojmark73 on the viewinggscreen, as viewed through
V 73. (PEG, 4‘); and the pointer 70‘ moves in front of, the 15
theview?nder 75. -»—Hence, thereafter, as the prevailing‘
prism so that the image of the index mark 73 will be seen '
light conditions cause the galvanoineteri needle 70 to move '
in the view?nder 75 of the camera at 73’-and the. pointer
in one direction or theother ,fromthezero position, there _
will beseen also as denoted, for instance, at 70'.
will be compensation for the ?lm speed in vthe adjustment
of the diaphragm aperture. ‘
The mechanism is illustrated diagrammatically in FIG.’
4,‘ where some liberties have been taken in order to show 20 I have, therefore, provided a'_simple,,compa_ct,_ conhen: the mechanism in one plane. Here the diaphragm, whose . ient mechanism ‘for: adjusting the diaphragm aperturegrelaf
tive to the exposure meter to compensatefqr any change
aperture is to‘beregulated, is denoted at 80, and itsleaves
in speed of the ?lm being used in the camera. Since the
are designated at_81. The diaphragm setting ring,‘which
two rollers 45 operate in opposite directions, turning of
- operates’ the diaphragm leaves to open or close down the
diaphragm aperture,v depending upon the rotation of the 25 r'elease'knob 36 can be 'eiiected in either direction .to line up any ASA number with index point 44; The trackjZ-I,
ring 82, is shown, as geared, by gearteeth 83 on the rin.g,_
of cam 26 can be made to any suitable curvature to com
_ pensate for the relative turning motions of galvanometer .
an idler gear ‘84, which meshes with teeth 33, and the gear
teeth 24, to the setting knob 22. which, as stated, has its
upper’face 23 graduated forthe ASA ?lmspeeds. In the
‘6-0 and diaphragm ring ’82, this depending, of course, upon
‘actual construction, the coupling member 26 is keyed to 30 the gear ratio between them. The outstanding feature. of
the apparatus disclosed is the ease {of changing for dif
' the cam 20.‘ For the purposes of the diagrammatic illus
\ferent ASAratings-by just holding one. member of a
tration in. FIG. 4, however, the member 26 is shown
coupling in place‘ while turning. the other to the-ASA
as geared to the cam 20. "
number ofYthe ?lm used. The coupling will uncouple
~ ‘ In operation, as light conditions change, the galvanom
eter coil will move pointer or needle 70 in one direction 35
and couple automatically.
‘ 1
or theother, depending upon prevailing light conditions.
While the invention has been described in connection
The photographer will adjust the diaphragm aperture to
match the pointer. This he does by turning setting knob
22‘ until the galvanometer needle 70 registers with the
that it is capable of funther modi?cation, and this applica~
with a speci?c embodiment thereof, it will be understood '
tion is intended to cover any variations, uses, or adapta
tions of the invention following, in general, the principles .
index mark 73 on the'viewing screen as seen at 73’
of the invention and including such departures. from the
through the view?nder. Rotationiof the setting knob 22
presentdisclosure as come within known or customary
practice in the art to which the invention pertains and as
may lbe applied to. the essential features‘ hereinbeforeset ,
causes the exposure meter 60* to be rotated and simul
taneously causes the diaphragm ring 82 which sets the
diaphragm aperture, to be rotated in proper proportion.
The exposure meter is rotated, upon rotation of the setting 45 forth, and as tall within the scope oi the invention or the
limits of the appended claims.
‘knob 22, through keys 32 (FIG. 3), slots 33 in hub 19v of
Having thus described my invention, what I claim is:
20, pin 50 which engages in cam 'slot 21, lever 51,
1. In a camera having an exposure meter and adia
pin 541(FIG. ‘2),slot 55, split clamp .56 and stud 58.
7' .Thfediaphragmring '82 (FIG. 4) is rotated, upon rotation
phragm, Isaid exposure meterxincluding a rotatable galva
nometer and a‘pointer for indicating the galvanometer‘ ‘
. of setting knob 22, through gear 24, idler 84, and gear’
teeth 83‘. The ring 82 is connected, in conventional
manner through 1a diiierential (not shown) to the shutter
"speed sttting' ring of the camerasothat at both ends of j
the movement of the diaphragm ring 182, the shutter speed‘
can be set. ‘Thus, the setting knjob can be used to. set
both diaphragm aperture and shutter‘ speed.
When a change in type of ?lm, which is usedin thev
camera, is made, the position of the setting ring 82 rela
reading, a manually-rotatable» setting knob, means-con
necting-said knob with the diaphragm to adjust? the‘dia
phragm aperture‘upon rotation of said. knob,.mean's~for
rotating said igalvanormeter to ‘bring the pointer into-a‘
predetenmined position, ‘means coupling the‘ lastfnamed'
means with said knob torota-te said :galvanometer upon
, rotationfof said knob, and rneansfor disconnecting :said
coupling means to permit said last-named means to? be
actuated independently'ofsa'id knob to change the rela
tive to the exposure meter setting is, changedto com
pensate for the change in speed of the new ?lm. For this 60 tive positions of theexposure 'meter and said knobito
compensate for '-change' in speed of the-photosensitiye purpose, the release member 36 is rotated while holding
medium'u-sed in the camera.
the setting knob 22, or vice versa, the setting knob 22 is
2; "In a camera having an exposure meter and a dia-' ‘
rotated while holding the release member 36. The end
phragrmsaid- exposure meter including ‘a rotatable: galé
38' or 39 of the rim 37 of the release .member 36 will
thereupon force one of the rollers 45 out of its ‘locked posi 65 vanorneter and a pointer'for indicating'the galvanometer 7
tion, andpart 36 and coupling member 26 will then be
turned together until the ‘ graduation on the ASAv scale,
reading, a manually-rotatable setting knob, means con
meeting said knob with the diaphragmto adjust the dia
phragm aperture upon rotation'of said knob, means for. '
which indicates the ASAFspeed rating of the new ?lm,
rotating’ said igalvanorrieter to bring’ said pointer into a '
registers against'the index mark 44 on the knob 22.
Thereby the coupling member 26 will be rotated to 70 predetermined position, means ‘for coupling the last-i
named means with said knob to rotate said 'galvanormeter .
rotate the cam 20, which through iever 51, link 56 and
upon rotation of said knob, means constantly ungin'g said
stud 58 will rotate the galvanometer and its needle 70 to
' proper zero position to conform to the new setting of the
ASA scale relative to the index on the knob 22. During
coupling means into operative position, and means opera
ble manually to disconnect said, coupling'means to ‘per
this adjustment, setting knob 22, gear 24, and diaphragm 75 mit said last-named means to be actuated independently
i "
3,100,428 ‘
of said knob to change the relative positions of said gal
?rst member to said galvanometer to rotate said galva- ,
vanometer and said knob to compensate ‘for change in
nometer’ upon rotation of said ?rst member to bring said
‘pointer into a predetermined position, a pair of rollers
; intenposedbetween con-fronting surfaces of said knob and
said ?rst member, one of said surfaces being eccentric of
the other surface, spring means for constantly urging both
speed of thephotosensitive medium used in the camera. .
3. In a camera having an exposure meteryand a dia
phragm, said exposure metersincluding a rotatable gal
vanometer and a pointen tor indicating the galvanometer
reading, a manually~rotatable setting knob, means con
neoting said knobiwith the diaphragmtto adjust the dia- ‘
- said ‘rollers apart into wedging positions between said
surfaces to couple said ?rst member to said knob, where
by said ?rst member is rotated upon rotation of said knob,
a second member mounted on said knob but rotatable
relative thereto, disengaging means carried by said sec
ond member positioned'upon rotation of said second
phragm aperture upon rotation of said knob, means for
rotating said galvanometer to bring said pointer into a
,predeterminedposition, "means for coupling the last
named' means withsaid knob to rotate said g’alvanometer
upon rotation of said‘; knob, resilient means constantly
unging said coupling means into operative position,‘ a
' member relative to said knob'to move said rollers toward
, one another against the resistance of said spring means
member mounted on said knob but rota-table relative 15 thereby to unconple said ?nst member from said knob,
thereto, means carried by'said member positioned upon
saidldisengaging meansbeing positioned thereupon to
rotation of said member relative tor-said‘ knob to disengage
said coupling means against the resistance of said resilient
' second member thereby to change the relative positions
drive said ?rst member upon continued rotation of said
means ‘and for thereupon actuating said last-named means
of said galvanometer and said knob to compensate for
independently of said knob to change the relative posi 20 change in speed of the photosensitive medium used in the
tions of said galvanometer and said knob to compensate
for change in speed {of the photosensitive medium used
I 6. A camena as claimed in claim 5 wherein said spring
in the
meansiis a U-shaped spring whose free ends are disposed
4. In a camera having an exposure meter ‘and a dia
‘ between said rollers, and wherein said second member
25 drives said ?rst member through one or other of said
phragm, said exposure meter including a rotatable gal
vanometer and a pointer tor indicating the galvanometer
rollers depending upon the direction of rotation of said
reading, a 'manually-rotatable setting knob‘, means con
second member relative to said knob, and through said
neoting said knob with the diaphragm to adjust the dia- ‘Y spring.
' ,
phragm aperture upon rotation of said knob, a ?rst mem
7 . A camera as claimed in claim 5 wherein said camera
ber rotatable relative’ to said knob, means connecting said 30 has a view?nder system including a prism, and said pre
?rst member to said galvanometer to rotate said galvan‘
determined position is ?xed by an index mark that'is
ometer upon rotation of said ?rst member to bring said
visible in said view?nder system.
pointer into a. predetenmined'position, ‘friction coupling
8. A camera as claimed in claim 5 wherein the means
means releasably' connecting said knob to said member
connecting said ?rst member to said .galvanometer includes
to rotate said ?rst member upon rotation of said-knob, a
a rotary cam that is connected to, rotate upon rotation
second member mounted on said knob but rotatable rela~
of said'?rs-t member, a lever, and a follower carried by
tive thereto, means carried by’ said second member posi
' said lever and engagingsaid cam, and means connecting
tioned upon rotation of said second member relative to
said lever to said galwanometer.
said knob to disengage said coupling means ‘and for there
9. A camera as claimed in claim 5 wherein one or said
upon rotating said ?rst member-independently of said 40 ,?nstmember and said knob is graduated for ?lm speed
knob to change the relative‘ positions of said galvanome
ratings and the other has an index mark readable against
ter and said knob to compensate tor change in speed of
said graduations.
the photosensitive medium used in the camera.
5. In acamera having an exposure meter and a dia
phragm, said exposure meter including a rotatable galva 45
References Cited in the ?le of this patent
nometer, and a pointer for indicating the ‘galvanometer
reading, a manually-rotatable setting knob, means con
meeting said knob to said diaphragm to adjust the dia
phragm aperture upon rotation of said knob, a ?rst mem
ber rotatable relative to said knob, means connecting
'Ilonnies ______________ __ July 29, 1941
Rentsohler ____________ __ May 19, 1959
Barthru? ______ ...‘ _____ __ Sept. 8, 1959
Sauer _______________ __ Apr. 26, 1960
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