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US3366024A - Diaphragm actuating mechanism - Google Patents

Diaphragm actuating mechanism Download PDF

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Publication number
US3366024A
US3366024A US461893A US46189365A US3366024A US 3366024 A US3366024 A US 3366024A US 461893 A US461893 A US 461893A US 46189365 A US46189365 A US 46189365A US 3366024 A US3366024 A US 3366024A
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US
United States
Prior art keywords
diaphragm
blades
ring
slots
pins
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US461893A
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English (en)
Inventor
Franz W R Starp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hittech Prontor GmbH
Original Assignee
Prontor Werk Alfred Gauthier GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prontor Werk Alfred Gauthier GmbH filed Critical Prontor Werk Alfred Gauthier GmbH
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Publication of US3366024A publication Critical patent/US3366024A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/08—Shutters

Definitions

  • the present invent-ion relates to a lens diaphragm actuating mechanism by means of which a plurality of diaphragm blades, or lamellae, are pivotedabout moving points between maximum and minimum diaphragm aperture settings by means of a setting ring which 1s obliged to move through only a relatively small operating angle, the blades being so arranged that, in spite of being set by a small movement of the setting ring, they operate with a relatively low moment of adjustment:
  • cams have been provided with different slopes for setting the diaphragm blades.
  • the blades In the positions of these blades corresponding to the largest values of the diaphragm apertures, for example from 2.8 to 4, the blades have to travel a comparatively long distance, and the operating cams therefore have comparatively steep slopes, reaching almost the limit of being self-arresting. As a result the forces required for moving the diaphragm blades must be relatively large.
  • the present invention solves the problem of permitting relatively large movement of the diaphragm blades with relatively small movement of the control, or setting, member and with relatively small torque on the setting member and on the blades by providing two adjusting pins for each of the blades. These pins extend through guide slots, of which there is at least one, or one section, for each diaphragm blade. In addition the pins extend through more or less radially extending slots.
  • radially extending slots are in one member and the guide slots are in another member and relative rotational movenient of one of these members with respect to the other causes the two pins for each blade to move in such a way as to'pivot the'blade inwardly or outwardly, depending on the direction of the relative motion of the one member.
  • the blades thus have no iixed pivot axle and the two movable pivot points may be relatively far apart, which tends to reduce the force required to pivo't'v the blades while at the same time the oatin-g pivot point of each of the blades ⁇ permits Vfull movement of the blades between maximum and minimum aperture settings with only a relatively small motion of one of the setting members with-respect to the other.
  • the invention provides guide slots arranged in a ring which is firmly connected to the diaphragm housingwhile radial slots are provided in a diaphragm setting ring.
  • the ring in which the guide slots are formed maycomprise the bottom of the diaphragm housing.
  • a variant ofthe foregoing arrangement is set forthin which the radial slots are formed in a'ring firmly connected in the diaphragm housing whereas the guide slots are yarranged in the ring that is used as the diaphragm setting member.
  • the ring in which the radial slots are formed also be the bottom of the diaphragm housing.
  • these slots may be formed either as a single slot or as two slots for each diaphragm blade.
  • FIG. 1 is a plan view of a diaphragm housing with its cover removed and with parts broken away to show a diaphragm setting ring and two diaphragm blades in their open position, the guide slots by which the blades are set being arranged in the bottom of the housing and being in the form of continuous slots;
  • FIG. 2 shows the housing of FIG. l with the cover removed and the diaphragm blades set to the position corresponding to the smallest diaphragm aperture;
  • FIG. 3 shows a cross-sectional view of the diaphragm housing of FIG. l along the line 3-3 of FIG. 1;
  • FIG. 4 is an enlarged cross-sectional view of a da phragm blade along the line 4 4 of FIG. 1;
  • FIG. 5 is another embodiment of the invention cor responding to FIG. 1 but with a modification of the control members;
  • FIG. 6 ⁇ shows the apparatus of FIG. 5 with the diaphragm blades set for the smallest aperture
  • FIG. 7 is a cross-sectional view of the housing of FIG. 5 along the line 7 7.
  • FIGS. l to 3 show the bottom 1 of a housing for a lens diaphragm having an edge 1a for concentrically guiding a diaphragm setting ring 2.
  • a cover 3 is attached to the edge la by means of several machine screws 4'.
  • the diaphragm housing may be built into a shutter housing of a photographic camera in accordance with known forms of construction, although the shutter housing is not shown for reasons of clarity.
  • Several diaphragm blades 5, each rotatably mounted, are associated with the diaphragm setting ring 2.
  • the adjusting movements of the diaphragm blades 5 are effected by turning the diaphragm setting ring 2 which has an arm 2a provided for this purpose.
  • This arm may be operatively connected to a manually operable diaphragm member, or control, on the camera shutter or to a sensing slide of an automatic exposure system built into the camera.
  • the arm 2a extends through an opening 1b in the edge 1a of the housing bottom 1. The circumferential dimension of this opening is determined by the movement of the arm necessary for setting the range of diaphragm values, for example, values from 2.8 to 22.
  • Each of the blades 5 is connected to the diaphragm setting ring 2 and to the housing 1 by a pair of adjusting pins 5a and 5b, which engage in separate slots, one for each diaphragm blade, 1c formed in the bottom of the housing 1. While the slots shown are in the form of an elongated S, these slots may also be developed as two individual slots. The curvature of each of the slots 1c is calculated to transform the rotary motion of the diaphragm setting ring 2 and its arm 2a with respect to the motion of the diaphragm bladesV 5 into a linear relationship.
  • the latter slot extends lapproximately radially with respect to the center of the diaphragm.
  • the second pin 5b of each blade 5 extends through a slot 2c which is'large enough so that it merely serves as a passage for the pinion and does not interfere with the motion thereof.
  • FIG. l the blades 5, of which only two of the ve actually included in a preferred embodiment, are shown, and these lblades are in positions corresponding to the full diaphragm aperture 6.
  • the arm 2a engages one end of the opening 1b while the adjusting pins 5a and 5b occupy the positions shown in the guide slots 1c.
  • the arm 2a may be rotated to rotate the diaphragm ring either manually or by means of engagement with a sensing slide of an automatic exposure system, as stated hereinabove. This rotation causes the pins w to move radially outwardly in the slots 2b as these pins, together with the pins 5b traverse the guide slots 1c.
  • FIGS. 5 to 7 the arrangement of the slots is reversed from the arrangement in FIGS. l to 3.
  • the bottom of the diaphragm housing is indicated by reference numeral 11 and is provided with an edge 11a.
  • a diaphragm setting ring 12 the motion of which is guided and constrained by the bottom 11 and the edge 11a, has an arm 12a which extends through an opening 11b in the edge.
  • the diaphragm blades of which there are five in the embodiment of FIGS. 5 to 7, although only two are shown for the sake of clarity, are associated with the diaphragm setting ⁇ ring 12 to be controlled thereby.
  • each of the blades 13 is controlled by a pair of adjusting pins 13a and 13b which extend into the guide slots 12b.
  • Each adjusting pin 13a extends into a substantially radially extending slot 11o in the bottom 11 of the diaphragm housing.
  • another slot 11d is formed in the bottom 11 adjacent to each of the blades 13, and a second adjusting pin 13b extends through the slot 11d.
  • the slot 11d is large enough so that it does not obstruct the motion of the adjusting pin 13b during the setting of the diaphragm blades 13. Because of the arrangement of a slot 11d for each of the adjusting pins 13b, the latter can be made just as long as each of the adjusting pins 13a, which prevents the pins 13b from being removed from engagement with the guide slot 12b.
  • the slots 11d may be dispensed with if the dimensions of the adjusting pins 13b are shortened accordingly.
  • the guide slot 12b is so shaped that the motion of the diaphragm blades 13 is made relatively linear.
  • a cover 14 fixed by means of screws 15 to the edge 11a of the bottom 11 is provided for the axial guiding of the diaphragm setting ring 12 and the blades 13.
  • the function of the diaphragm shown in FIGS. 5 to 7 is similar to that of the arrangement of FIGS. 1 to 4, so that no special explanation is deemed to be necessary.
  • Diaphragm control apparatus comprising: a plurality of diaphragm blades; a first ring; a second ring concentric with said first ring, at least one of said rings being yrotatable with respect to the other; a guide slot in said first ring; a substantially radial slot in said second ring; a first pin attached to each of said diaphragm blades and extending through both of said slots; and a second pin attached to each of said blades and extending into said guide slot to be engaged thereby.
  • the apparatus of claim 1 comprising a diaphragm housing and in which said first ring is fixedly connected to said housing and said second ring moves with respect to said first ring.
  • Diaphragm control apparatus comprising: a plurality of diaphragm blades; a first ring; a second ring concentric with said first ring, at least one of said rings being rotatable with respect to the other; a separate guide slot in said first ring for each of said blades; a separate radial slot in said second ring for each of said blades; a plurality of first pins, each of said first pins being attached to one of said diaphragm blades and extending through one of said radial slots and one of said guide slots; a plurality of second pins, each of said second pins being attached to one of said diaphragm blades and extending into the same guide slot as the first pin of the same blade, whereby relative rotation of one of said rings with respect to the other of said rings forces both pins of each of said blades to move along the respective one of said slots to pivot said blades.
  • Diaphragm control apparatus comprising: a plurality of diaphragm blades; a first ring; a second ring concentric with said first ring, at least one of said rings being rotatable with respect to the other; a plurality of rst and second guide slots in said first ring arranged so that there is one first and one second guide slot for each of said diaphragm blades; a plurality of substantially radial slots in said second ring, the number of said radial slots being equal to the number of said blades; a plurality of rst pins, one of said first pins being attached to each of said diaphragm blades and extending through one of said substantially radial slots and one of said first guide slots; a plurality of second pins, one of said second pins being attached to each of said diaphragm blades and extending into one of said second guide slots corresponding to the diaphragm blade to which said secl ond pin is attached, whereby relative motion of one of said first

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
US461893A 1964-06-06 1965-06-07 Diaphragm actuating mechanism Expired - Lifetime US3366024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG40784A DE1214529B (de) 1964-06-06 1964-06-06 Objektivblende, insbesondere fuer photographische Kameras

Publications (1)

Publication Number Publication Date
US3366024A true US3366024A (en) 1968-01-30

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ID=7126512

Family Applications (1)

Application Number Title Priority Date Filing Date
US461893A Expired - Lifetime US3366024A (en) 1964-06-06 1965-06-07 Diaphragm actuating mechanism

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US (1) US3366024A (de)
DE (1) DE1214529B (de)
GB (1) GB1069616A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478662A (en) * 1966-12-15 1969-11-18 Polaroid Corp Multiple-axis folded optical system for a photographic camera
US3511157A (en) * 1967-08-30 1970-05-12 Polaroid Corp Camera shutter and diaphragm apparatus
US3727531A (en) * 1971-07-21 1973-04-17 Schneider Co Optische Werke Iris diaphragm with linear aperture scale
US4335947A (en) * 1979-11-21 1982-06-22 Balda-Werke Photographische Gerate Und Kunststoff Gmbh & Co., Kg Camera shutter assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB268049A (en) * 1925-12-28 1927-03-28 Herbert Hill Improvements in and relating to anti-dazzle devices for vehicle lamps
FR1281533A (fr) * 1961-01-06 1962-01-12 Compur Werk Friedrich Deckel Diaphragme pour objectifs photographiques
US3055282A (en) * 1958-09-22 1962-09-25 Agfa Ag Iris diaphragm

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142751B (de) * 1961-03-14 1963-01-24 Agfa Ag Blende

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB268049A (en) * 1925-12-28 1927-03-28 Herbert Hill Improvements in and relating to anti-dazzle devices for vehicle lamps
US3055282A (en) * 1958-09-22 1962-09-25 Agfa Ag Iris diaphragm
FR1281533A (fr) * 1961-01-06 1962-01-12 Compur Werk Friedrich Deckel Diaphragme pour objectifs photographiques

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478662A (en) * 1966-12-15 1969-11-18 Polaroid Corp Multiple-axis folded optical system for a photographic camera
US3511157A (en) * 1967-08-30 1970-05-12 Polaroid Corp Camera shutter and diaphragm apparatus
US3727531A (en) * 1971-07-21 1973-04-17 Schneider Co Optische Werke Iris diaphragm with linear aperture scale
US4335947A (en) * 1979-11-21 1982-06-22 Balda-Werke Photographische Gerate Und Kunststoff Gmbh & Co., Kg Camera shutter assembly

Also Published As

Publication number Publication date
DE1214529B (de) 1966-04-14
GB1069616A (en) 1967-05-24

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