GB2183352A - Focal plane leaf shutter - Google Patents

Focal plane leaf shutter Download PDF

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Publication number
GB2183352A
GB2183352A GB08625394A GB8625394A GB2183352A GB 2183352 A GB2183352 A GB 2183352A GB 08625394 A GB08625394 A GB 08625394A GB 8625394 A GB8625394 A GB 8625394A GB 2183352 A GB2183352 A GB 2183352A
Authority
GB
United Kingdom
Prior art keywords
auxiliary plate
spring shackle
camera housing
shutter
plate
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.)
Granted
Application number
GB08625394A
Other versions
GB2183352B (en
GB8625394D0 (en
Inventor
Ingenieur Hans Zimmet
Ingenieur Herbert Welzel
Ingenieur Gerhard Liebscher
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.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
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 Pentacon Dresden VEB filed Critical Pentacon Dresden VEB
Publication of GB8625394D0 publication Critical patent/GB8625394D0/en
Publication of GB2183352A publication Critical patent/GB2183352A/en
Application granted granted Critical
Publication of GB2183352B publication Critical patent/GB2183352B/en
Expired 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
    • G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
    • G03B9/18—More than two members

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)

Abstract

A focal plane leaf shutter, adapted for connection to the housing of a photographic camera, comprising a main plate (3) on which are mounted the groups of leading opening and trailing closing leaves (4,5) together with their drive members, an auxiliary plate (7) connected to the main plate by spacer bolts (6) and a cocking lever (9) for the drive members which is rotatable about a cocking spindle which has an end mounted in the auxiliary plate. A spring shackle (11) is provided which is fixed by means of a journal (12) on the auxiliary plate (7) to pivot parallel with the plane thereof. The spring shackle (11) may be bent at a right-angle to the plane of the said auxiliary plate (7), the free end of the spring shackle (11) being provided with an eccentrically inclined elongated hole (13) for securement to the camera housing. <IMAGE>

Description

SPECIFICATION Focal plane leaf shutter The invention relates to a focal plane leaf shutter comprising, adapted to be connected to the housing of a photographic camera, a main plate on which are mounted the groups of leading opening and trailing closing leavestogetherwith their drive members, an auxiliary plate connected to the main plate by spacer bolts and a cocking leverforthe drive members which is rotatable about a cocking spindle which has at least one end mounted inthe auxiliary plate.
Known shutters of this type (DE-AS 2645652) are fixed in the camera housing by means of their main plate, while the auxiliary plate provided to form bearing points particularly for the cocking lever, is con nected to the main plate by spacer bolts. The force needed to cockthe shutter provides, due to the distance from the cocking lever to the main plate, a bending momentforthe spacer bolts and thus the danger of an elastic variation in the location ofthe auxiliary plate. This stress is particularly critical when a motorised winder is used. This necessitates a strong construction ofthe auxiliary plate and of the spacer bolts.
By avoiding the said bending stresses, the inven tion sets out to achieve a lighter construction ofthe said type of shutter.
The object of the invention is to provide a stable fitment of the shutter in the camera housing. Accord- ing to the invention, this is achieved in that fixed by means of a journal on the auxiliary plate and adapted to pivot parallel with the planethereofthere is a spring shackle which can be bent at a right-angletothe plane of the said auxiliary plate, the free end ofthe spring shackle being provided with an eccentrically inclined elongated hole. Such a spring shackle braces the auxiliary plate against the camera hous- ing and can atthesametimecompensateforany production-based positional differences between the auxiliary plate and its point of attachment in the camera housing.It is expedientforthe spring shackle to be disposed in rotatable fashion in the camera housing, by the use of a fixing screw. As a result of a different embodiment, the spring shackle is rotatable on the auxiliary plate by means of a rivet.
The invention is explained with reference to an embodiment which is described hereinafter and which is shown in the accompanying drawings, in which: Figure 1 is an overall view of a shutter according to the invention; Figure2 is an enlarged section in the region ofthe cocking lever; Figure 3 is an enlarged individual view of the spring shackle and Figure4shows a further disposition ofthe spring shackle.
Fixed by means of the screw2 in a partially illustrated camera housing 1 (Figure 2) is the main plate 3 on which, in known manner, are mounted the groups of leading opening leaves 4 and trailing closing leaves 5 together with their drive mechanism (Figure 1). Spa cer bolts 6 rigidly connect the auxiliary plate 7 to the main plate3. Mounted inthe main plate3and inthe auxiliary plate 7 is the cocking spindle 8 aboutwhich the cocking lever 9 for the drive mechanism is rotatable. The auxiliary plate 7 furthermore serves for mounting ofthecontrol members 10forthedrive mechanism which operates under spring force. Con nected by the rivet 12to the auxiliary plate7 istheflat spring shackle 11 (Figure 3), which is rotatable with difficulty about the rivet 12.At its other end, the spring shackle 11 comprises an elongated hole 13which extends eccentrically at an angle (x of 90 . The el- ongated hole 13 serves to accommodate a further fixing screw 14which is likewise anchored in the camera housing 1.
The arrangement operates in the following way: The shutter is fixed in the camera housing by means of its main plate 3 and the screws 2. Thus, the shutter has assumed its function-dictated location in the camera housing 1. Without varying this location, it is possible by stiff pivoting of the spring shackle 11, to bring the elongated hole 13 into a position coincident with the threaded bore provided in the camera housing 1 for the fixing screw 14.Differences in height which may occurthereby between the plane ofthe auxiliary plate 7 and the plane of the camera housing 1 in the region ofthe said threaded bore are compensated by the spring shackle 11 which, by virtue of its elastic property, can move aside at a right-angletothe plane ofthe auxiliary plate 7. Inthis position the spring shackle 11 is fixed by means of thefurtherfixing screw 14. Thus, also theauxiliary plate 7 is anchored in respect of the camera housing 1 sufficiently that upon movement of the cocking lever 9 against the drive springs for the shutter mechanism,the bending moment arising is absorbed by the spring shackle 11.
In accordance with a further embodiment (see Figure 4), the spring shackle 11 is anchored in the camera housing 1 by means ofthefurtherfixing screw 14, while the eccentrically inclined elongated hole 13 is connected to the auxiliary plate 7 the screw 15. With this arrangement, an easy pivoting of the spring shackle 11 is possible until such time as the fixing screw 14has beentightened.
1. Focal plane leaf shutter, adapted for connec tiontothehousing of a photographic camera, comprising a main plate on which are mounted the groups of leading opening and trailing closing leaves together with their drive members, an auxiliary plate connected to the main plate by spacer bolts and a cocking leverforthe drive members which is rotatable about a cocking spindle which has at least one end mounted in the auxiliary plate, char acterisedinthatfixed by means of a journal on the auxiliary plate (7) and adapted to pivot parallel with the planethereofthere is is a spring shackle (11) which can be bent at a right-angletothe plane of the said auxiliary plate (7),thefree end of the spring shackle (11) being provided with an eccentrically inclined elongated hole (13).
2. Focal plane leaf shutter according to claim 1, charadterised in that the spring shackle (11) is rotat
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Focal plane leaf shutter The invention relates to a focal plane leaf shutter comprising, adapted to be connected to the housing of a photographic camera, a main plate on which are mounted the groups of leading opening and trailing closing leavestogetherwith their drive members, an auxiliary plate connected to the main plate by spacer bolts and a cocking leverforthe drive members which is rotatable about a cocking spindle which has at least one end mounted inthe auxiliary plate. Known shutters of this type (DE-AS 2645652) are fixed in the camera housing by means of their main plate, while the auxiliary plate provided to form bearing points particularly for the cocking lever, is con nected to the main plate by spacer bolts. The force needed to cockthe shutter provides, due to the distance from the cocking lever to the main plate, a bending momentforthe spacer bolts and thus the danger of an elastic variation in the location ofthe auxiliary plate. This stress is particularly critical when a motorised winder is used. This necessitates a strong construction ofthe auxiliary plate and of the spacer bolts. By avoiding the said bending stresses, the inven tion sets out to achieve a lighter construction ofthe said type of shutter. The object of the invention is to provide a stable fitment of the shutter in the camera housing. Accord- ing to the invention, this is achieved in that fixed by means of a journal on the auxiliary plate and adapted to pivot parallel with the planethereofthere is a spring shackle which can be bent at a right-angletothe plane of the said auxiliary plate, the free end ofthe spring shackle being provided with an eccentrically inclined elongated hole. Such a spring shackle braces the auxiliary plate against the camera hous- ing and can atthesametimecompensateforany production-based positional differences between the auxiliary plate and its point of attachment in the camera housing.It is expedientforthe spring shackle to be disposed in rotatable fashion in the camera housing, by the use of a fixing screw. As a result of a different embodiment, the spring shackle is rotatable on the auxiliary plate by means of a rivet. The invention is explained with reference to an embodiment which is described hereinafter and which is shown in the accompanying drawings, in which: Figure 1 is an overall view of a shutter according to the invention; Figure2 is an enlarged section in the region ofthe cocking lever; Figure 3 is an enlarged individual view of the spring shackle and Figure4shows a further disposition ofthe spring shackle. Fixed by means of the screw2 in a partially illustrated camera housing 1 (Figure 2) is the main plate 3 on which, in known manner, are mounted the groups of leading opening leaves 4 and trailing closing leaves 5 together with their drive mechanism (Figure 1). Spa cer bolts 6 rigidly connect the auxiliary plate 7 to the main plate3. Mounted inthe main plate3and inthe auxiliary plate 7 is the cocking spindle 8 aboutwhich the cocking lever 9 for the drive mechanism is rotatable. The auxiliary plate 7 furthermore serves for mounting ofthecontrol members 10forthedrive mechanism which operates under spring force. Con nected by the rivet 12to the auxiliary plate7 istheflat spring shackle 11 (Figure 3), which is rotatable with difficulty about the rivet 12.At its other end, the spring shackle 11 comprises an elongated hole 13which extends eccentrically at an angle (x of 90 . The el- ongated hole 13 serves to accommodate a further fixing screw 14which is likewise anchored in the camera housing 1. The arrangement operates in the following way: The shutter is fixed in the camera housing by means of its main plate 3 and the screws 2. Thus, the shutter has assumed its function-dictated location in the camera housing 1. Without varying this location, it is possible by stiff pivoting of the spring shackle 11, to bring the elongated hole 13 into a position coincident with the threaded bore provided in the camera housing 1 for the fixing screw 14.Differences in height which may occurthereby between the plane ofthe auxiliary plate 7 and the plane of the camera housing 1 in the region ofthe said threaded bore are compensated by the spring shackle 11 which, by virtue of its elastic property, can move aside at a right-angletothe plane ofthe auxiliary plate 7. Inthis position the spring shackle 11 is fixed by means of thefurtherfixing screw 14. Thus, also theauxiliary plate 7 is anchored in respect of the camera housing 1 sufficiently that upon movement of the cocking lever 9 against the drive springs for the shutter mechanism,the bending moment arising is absorbed by the spring shackle 11. In accordance with a further embodiment (see Figure 4), the spring shackle 11 is anchored in the camera housing 1 by means ofthefurtherfixing screw 14, while the eccentrically inclined elongated hole 13 is connected to the auxiliary plate 7 the screw 15. With this arrangement, an easy pivoting of the spring shackle 11 is possible until such time as the fixing screw 14has beentightened. CLAIMS
1. Focal plane leaf shutter, adapted for connec tiontothehousing of a photographic camera, comprising a main plate on which are mounted the groups of leading opening and trailing closing leaves together with their drive members, an auxiliary plate connected to the main plate by spacer bolts and a cocking leverforthe drive members which is rotatable about a cocking spindle which has at least one end mounted in the auxiliary plate, char acterisedinthatfixed by means of a journal on the auxiliary plate (7) and adapted to pivot parallel with the planethereofthere is is a spring shackle (11) which can be bent at a right-angletothe plane of the said auxiliary plate (7),thefree end of the spring shackle (11) being provided with an eccentrically inclined elongated hole (13).
2. Focal plane leaf shutter according to claim 1, charadterised in that the spring shackle (11) is rotat able in the camera housing (1) by means of a fixing screw (14).
3. Focal plane leaf shutter according to claim 1, characterised in that the spring shackle (11) is rotatable on the auxiliary plate (7) by means of a rivet (12),
4. Focal plane leafshutter as claimed in claim 1 substantially as described with reference to Figures 1-4 of the accompanying drawings.
GB8625394A 1985-11-21 1986-10-23 Focal plane leaf shutter Expired GB2183352B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD28307585A DD242876A1 (en) 1985-11-21 1985-11-21 BLADES SLOT CLOSURE

Publications (3)

Publication Number Publication Date
GB8625394D0 GB8625394D0 (en) 1986-11-26
GB2183352A true GB2183352A (en) 1987-06-03
GB2183352B GB2183352B (en) 1989-10-04

Family

ID=5573239

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8625394A Expired GB2183352B (en) 1985-11-21 1986-10-23 Focal plane leaf shutter

Country Status (3)

Country Link
DD (1) DD242876A1 (en)
DE (1) DE3635995A1 (en)
GB (1) GB2183352B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249188A (en) * 1990-10-05 1992-04-29 Asahi Optical Co Ltd Camera body construction

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645652C3 (en) * 1975-10-13 1980-06-12 Copal Co. Ltd., Tokio Focal plane shutter for a photographic camera

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249188A (en) * 1990-10-05 1992-04-29 Asahi Optical Co Ltd Camera body construction
GB2249188B (en) * 1990-10-05 1994-04-06 Asahi Optical Co Ltd Camera
US5732302A (en) * 1990-10-05 1998-03-24 Asahi Kagaku Kogyo Kabushiki Kaisha Camera having deformable shock dampening members

Also Published As

Publication number Publication date
DD242876A1 (en) 1987-02-11
GB2183352B (en) 1989-10-04
DE3635995C2 (en) 1992-07-16
GB8625394D0 (en) 1986-11-26
DE3635995A1 (en) 1987-06-04

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PCNP Patent ceased through non-payment of renewal fee