US3532046A - Photographic shutter - Google Patents

Photographic shutter Download PDF

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Publication number
US3532046A
US3532046A US719006A US3532046DA US3532046A US 3532046 A US3532046 A US 3532046A US 719006 A US719006 A US 719006A US 3532046D A US3532046D A US 3532046DA US 3532046 A US3532046 A US 3532046A
Authority
US
United States
Prior art keywords
blade
blades
exposure
shutter
closing
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
US719006A
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English (en)
Inventor
Otto Wienchol
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.)
Compur Werk GmbH and Co
Original Assignee
Compur Werk GmbH and Co
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 Compur Werk GmbH and Co filed Critical Compur Werk GmbH and Co
Application granted granted Critical
Publication of US3532046A publication Critical patent/US3532046A/en
Anticipated expiration legal-status Critical
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
    • G03B9/36—Sliding rigid plate
    • G03B9/40—Double plate
    • G03B9/42—Double plate with adjustable slot; with mechanism controlling relative movement of plates to form slot

Definitions

  • the mask- PHOTOGRAPHIC SHUTTER ing blade is parallel to and slightly spaced from the main blade 4 Claims 2 Drawing Figs with which it is associated, to form a thin pocket between the U.S.Cl. 95/55 m in blade n i associated ng blade. which p ke lnt.Cl G03b 9/36 receives a portion of the sup lementary blade of the same Field of Search 95/55 g up of blades.
  • the present invention relates to focalplane shutters, as distinguished from objective shutters or between-the-lens shutters.
  • Focal plane shutters are located just in front of, and as near as possible to, the focal plane or film plane of the camera.
  • the shutter normally blocks off passage of light to the focal plane.
  • the shutter parts are moved to provide an opening through which light may reach the sensitized film in the focal plane.
  • focal plane shutters sometimes called curtain shutters
  • the light obstructing material is flexible, and is unwound from one roller and wound up on another roller.
  • blades which may also be called slides
  • one blade having a trailing edge which may be called the opening edge
  • another blade having an advancing edge which may be called the closing edge and which follows along after the opening edge, leaving a space between them which may be called the exposure slot.
  • An object of the present invention is to avoid this, and to provide a simple, economical, and especially a compact construction affording safe protection against entry of light at the overlap of the blades, even if the stray light comes laterally, from directions at a great angle to the optical axis.
  • FIG. 2 is a horizontal section through the unit, taken approximately on the line ll-ll ofFIG. l.
  • the shutter unit comprises a housing having two approximately rectangular portions of similar outline, a rear portion 22 and a front portion 24 connected to each other by a few screws 26.
  • the two parts of the housing have openings or picture windows 22b and 24b, respectively, which are alined with each other and which define the exposure aperture or picture area through which light may pass rearwardly to impinge upon the sensitized photographic film located immediately behind the shutter unit.
  • the usual lens (not shown) of the camera has an optical axis which extends centrally through the exposure area or picture window defined by the openings 22b and 24b.
  • the exposure aperture is under the control of flat blades or slides which are vertically movable and alternately open and close the exposure aperture.
  • each blade is secured, as for example by screws, to its own individual guide element or carrier 130, 132, 134, and 136, respectively, the blades and their carriers being movable vertically in a hollow space between the rear section 22 and the from section 24 of the housing.
  • guide rods 38 and 40 which serve as tracks or rails on which the guide elements or carriers 130, 132, 134, and 136 may move vertically.
  • the blades 30 and 32 collectively constitute the opening group of blades, of which the blade 30 is the main opening blade and the blade 32 is the trailing or supplementary opening blade.
  • the horizontally extending upper edge of the blade 30 constitutes the opening edge of the exposure slot, during the exposure operation.
  • the blades 34 and 36 collectively constitute the closing group of blades, of which the blade 34 is the main closing blade and 36 is the trailing or supplementary closing blade.
  • the horizontally extending lower edge of the blade 34 is the closing edge of the exposure slot.
  • each guide element or carrier of each individual slide has a web to which the slide itself is fastened. Laterally projecting portions or flanges at the top and bottom of each guide element are slidably engaged with the guide rods 38 and 40.
  • the carriers and and 132 for the respective opening blades 30 and 32 have webs 130a and 132a to which the respective blades are attached, and have flanges 13% and 132b which completely encircle the guide rod 38 and have holes through which the guide rod extends slidably but snugly, and also have flanges 130s and 132s, respectively, with open sided notches for engaging the other guide rod 40 sufficiently to prevent these respective carriers from swinging on the guide rod 38, but not completely encircling the guide rod 40.
  • the blades are accurately guided for movement in planes parallel to and relatively close to each other. Only a very short length of guidance on the rods 38 and 40 is necessary, as a result of which the guiding accuracy is very high and the constructional size is reduced. Also, the guidance and the retention against rotary movement takes place under low-friction conditions, since the carriers 130, 132, 134, and 136, or at least the parts thereof which engage the rods 38 and 40, are preferably molded from low friction plastic material, such as Delrin" or Teflon, both of which are well known per se, and which have a very low coefficient of sliding friction when sliding on the rods 38 and 40 which are of metal. Moreover, the plastic material may preferably be impregnated or coated with a friction-reducing compound such as molybdenum disulphide.
  • a friction-reducing compound such as molybdenum disulphide.
  • both of the closing blades 34 and 36 lie above the top edge of the picture window 22b, and the window is covered by the two opening blades 30 and 32, the blade 30 closing the upper part and the blade 32 closing the lower part of the picture area, with the blades overlapping each other to some extent across the center of the picture.
  • This tensioned or cocked position of the blades is not illustrated in the drawings of the present application, but will be readily understood by those skilled in the art, and is illustrated in FIG. of the drawings of said prior application, although the blades in the prior application do not have the additional features which form the subject matter of the present invention.
  • the masking or auxiliary blade 300 lying flat against and riveted to the blade 30 at their right hand ends, is bent so that the main part of the length of the blade 300 lies parallel to and slightly spaced from the blade 30. forming a thin pocket between the blades 30 and 300.
  • the effective light-blocking part of the length of the supplementary opening blade 32 throughout substantially its entire height, lies within this pocket between the blades 30 and 300.
  • the right hand end of the masking blade 340 lies against the right hand end of the main closing blade 34 and is blade 34, to provide a pocket between them.
  • the blade 36 lies, throughout substantially its entire height, within the pocket between the blades 34 and 340.
  • only the lower edge portion or overlapping portion of the height of the blade 36 lies within the pocket formed between the blades 34 and 340.
  • the masking blades or auxiliary blades 300 and 340 thus provide what may be called a labyrinth-type overlapping arrangement with their respective trailing or supplementary blades 32 and 36, effectively preventing stray light from passing between the respective blades where they are overlapped, even if such stray light comes from the side or obliquely, rather than coming in the general direction of the optical axis. Since the masking blades 300 and 340 are very thin, these masking blades even with their rivets represent only a very trivial and entirely acceptable increase in the weight and size of the shutter assembly.
  • the slides are moved upwardly from the rest or run down positions shown shown shown FIG. 1, as for example by means of a pinion which engages the gear teeth of a rack bar 1302 which is mounted on the carrier and extends parallel to the guide rods 38 and 40.
  • the pinion is coupled to the film advancing mechanism of the camera, so that when the film is advanced the pinion will be rotated to raise the carrier 130 to its cocked or tensioned position, and this upward movement of the carrier 130 also raises the carriers 132, 134, and 136 of the other blades, because of cooperating parts on one carrier overlying parts on another, as will be readily understood by those familiar with said priorapplication.
  • each masking blade is riveted at one end to one end of the respective main blade on which it is mounted, and extends therefrom in a direction toward the opposite end of the respective main blade on which it is mounted, spaced from and substantially parallel to such blade.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
US719006A 1967-04-11 1968-04-05 Photographic shutter Expired - Lifetime US3532046A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC0042009 1967-04-11

Publications (1)

Publication Number Publication Date
US3532046A true US3532046A (en) 1970-10-06

Family

ID=7024793

Family Applications (1)

Application Number Title Priority Date Filing Date
US719006A Expired - Lifetime US3532046A (en) 1967-04-11 1968-04-05 Photographic shutter

Country Status (2)

Country Link
US (1) US3532046A (enrdf_load_stackoverflow)
FR (1) FR1557504A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964078A (en) * 1973-11-07 1976-06-15 Asahi Kogaku Kogyo Kabushiki Kaisha Electro-mechanical arrangement in a single lens reflex camera having a detachable bottom cover plate for providing access to a circuit board of the arrangement
US4147418A (en) * 1977-10-11 1979-04-03 Polaroid Corporation Photographic exposure control system with independent ambient and artificial illumination control modes
US4220409A (en) * 1977-01-11 1980-09-02 Copal Company Limited Focal plane shutter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964078A (en) * 1973-11-07 1976-06-15 Asahi Kogaku Kogyo Kabushiki Kaisha Electro-mechanical arrangement in a single lens reflex camera having a detachable bottom cover plate for providing access to a circuit board of the arrangement
US4220409A (en) * 1977-01-11 1980-09-02 Copal Company Limited Focal plane shutter
US4147418A (en) * 1977-10-11 1979-04-03 Polaroid Corporation Photographic exposure control system with independent ambient and artificial illumination control modes

Also Published As

Publication number Publication date
FR1557504A (enrdf_load_stackoverflow) 1969-02-14

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