Focal plane shutter for cameras

Abstract

In the focal plane shutter for cameras, a shutter base plate, an shank for attaching the first blade drive component and the second blade drive component respectively so as to enable to be rotated, an shank for attaching a set component so as to enable to be rotated, and an shank for attaching the first blade and the second blade so as to enable to be rotated respectively are made of synthetic resins. Each of the shanks is fabricated after a shutter base plate was fabricated beforehand, and grooves for sump having cross section of V letter shape are formed at the same interval of angle extending toward the axial direction of the shank at the circumferential side surfaces of the shanks.

1 . A focal plane shutter for cameras
 comprising,   a shutter base plate having an aperture for exposure which is made of synthetic resin;   at least one shutter blade in which each end of arms is individually attached rotatably to two or more blade attachment shanks which consist of two or more arms and at least one blade pivoted on these arms, and is installed upright to the shutter base plate;   and   at least one drive component which is rotatably attached to the shutter base plate, and makes opening and closing operations of the aperture by the shutter blade by swinging one of the arms, wherein   at least one attachment shank of two or more attachment shanks which is installed upright in order to install a rotation component including the blade attachment shank is made of the synthetic resin,   and   the shutter base plate and the attachment shank are formed by such way that after either of them is fabricated, the other is fabricated.   
   
   
       2 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   in case that the attachment shank is fabricated on the shutter base plate after the shutter base plate was fabricated,   the shutter base plate has a circular pore at a position where the attachment shank is installed upright before the attachment shank is fabricated and after the shutter base plate was fabricated.   
   
   
       3 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   in case that the attachment shank is fabricated on the shutter base plate after the shutter base plate was fabricated,   the shutter base plate has a non-circular pore at a position where the attachment shank is installed upright before the attachment shank is fabricated, and after the shutter base plate was fabricated.   
   
   
       4 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   in case that the shutter base plate is fabricated on the attachment shank after the attachment shank was fabricated, the attachment shank is formed so that a cross section of the shank part installed upright to the shutter base plate is formed as a circular shape before the shutter base plate is fabricated and after the attachment shank was fabricated.   
   
   
       5 . The focal plane shutter for cameras according to  claim 1 , wherein
 in case that the shutter base plate is fabricated on the attachment shank after the attachment shank was fabricated, the attachment shank is formed so that a cross section of the shank part installed upright to the shutter base plate is formed as a non-circular shape before the shutter base plate is fabricated and after the attachment shank was fabricated.   
   
   
       6 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   when the shutter base plate and the attachment shank are fabricated, the shutter base plate is inserted between two flange parts formed by fabrication of the attachment shank.   
   
   
       7 . The focal plane shutter for cameras according to  claim 1 ,
 when the shutter base plate and the attachment shank are fabricated, the attachment shank is arranged so that the shank part installed upright to this shutter base plate may be laid under the shutter base plate.   
   
   
       8 . The focal plane shutter for cameras according to  claim 7 , wherein
 as for the attachment shank, at least a part of the shank part being laid under the shutter base plate is formed thicker than the shank part which is not laid under the shutter base plate.   
   
   
       9 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   the rotation component attached to the attachment shank is a component which is energized by a spring to a direction of rotation.   
   
   
       10 . The focal plane shutter for cameras according to  claim 6 , wherein
 the rotation component attached to the attachment shank is a component which is energized by a spring to a direction of rotation.   
   
   
       11 . The focal plane shutter for cameras according to  claim 7 , wherein
 the rotation component attached to the attachment shank is a component which is energized by a spring to a direction of rotation.   
   
   
       12 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   at least one of the rotation components is the drive component;   at least one of the attachment shank is a drive component attachment shank installed upright to the shutter base plate in order that the drive component is attached so as to enable to be rotated;   and   the drive component attachment shank has the blade attachment shank in the blade room side.   
   
   
       13 . The focal plane shutter for cameras according to  claim 6 , wherein
 at least one of the rotation components is the drive component;   at least one of the attachment shank is a drive component attachment shank installed upright to the shutter base plate in order that the drive component is attached so as to enable to be rotated;   and   the drive component attachment shank has the blade attachment shank in the blade room side.   
   
   
       14 . The focal plane shutter for cameras according to  claim 7 , wherein
 at least one of the rotation components is the drive component;   at least one of the attachment shank is a drive component attachment shank installed upright to the shutter base plate in order that the drive component is attached so as to enable to be rotated;   and   the drive component attachment shank has the blade attachment shank in the blade room side.   
   
   
       15 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   at least one of the rotation components is the drive component, which is rotatably attached to the drive component attachment shank of the attachment shanks, and is rotated by the energized power of a drive spring at the time of photographing;   and   another of the rotation components is a set component which is rotatably attached to the set component attachment shank of the attachment shanks,   wherein   the set component starts rotation from an initial position while resisting the energized power of a return spring at the time of setting, and rotates the drive component to a set position while resisting the energized power of the drive spring;   and   at the time of photographing, it returns to the initial position by the energized power of the return spring in advance of start of rotation start of the drive component.   
   
   
       16 . The focal plane shutter for cameras according to  claim 6 , wherein
 at least one of the rotation components is the drive component, which is rotatably attached to the drive component attachment shank of the attachment shanks, and is rotated by the energized power of a drive spring at the time of photographing;   and   another of the rotation components is a set component which is rotatably attached to the set component attachment shank of the attachment shanks,   wherein   the set component starts rotation from an initial position while resisting the energized power of a return spring at the time of setting, and rotates the drive component to a set position while resisting the energized power of the drive spring;   and   at the time of photographing, it returns to the initial position by the energized power of the return spring in advance of start of rotation start of the drive component.   
   
   
       17 . The focal plane shutter for cameras according to  claim 7 , wherein
 at least one of the rotation components is the drive component, which is rotatably attached to the drive component attachment shank of the attachment shanks, and is rotated by the energized power of a drive spring at the time of photographing;   and   another of the rotation components is a set component which is rotatably attached to the set component attachment shank of the attachment shanks,   wherein   the set component starts rotation from an initial position while resisting the energized power of a return spring at the time of setting, and rotates the drive component to a set position while resisting the energized power of the drive spring;   and   at the time of photographing, it returns to the initial position by the energized power of the return spring in advance of start of rotation start of the drive component.   
   
   
       18 . The focal plane shutter for cameras according to  claim 12 , wherein
 the drive component and the set component are made of synthetic resins,   and   the synthetic resin materials are almost the same to the synthetic resin materials of the drive component attachment shank and the set component attachment shank.   
   
   
       19 . The focal plane shutter for cameras according to  claim 13 ,
 wherein   the drive component and the set component are made of synthetic resins,   and   the synthetic resin materials are almost the same to the synthetic resin materials of the drive component attachment shank and the set component attachment shank.   
   
   
       20 . The focal plane shutter for cameras according to  claim 15 , wherein
 the drive component and the set component are made of synthetic resins,   and   the synthetic resin materials are almost the same to the synthetic resin materials of the drive component attachment shank and the set component attachment shank.   
   
   
       21 . The focal plane shutter for cameras according to  claim 16 ,
 wherein   the drive component and the set component are made of synthetic resins,   and   the synthetic resin materials are almost the same to the synthetic resin materials of the drive component attachment shank and the set component attachment shank.   
   
   
       22 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   the synthetic resin material of the attachment shank has almost same coefficient of expansion of the synthetic resin material of the shutter base plate.   
   
   
       23 . The focal plane shutter for cameras according to  claim 6 , wherein
 the synthetic resin material of the attachment shank has almost same coefficient of expansion of the synthetic resin material of the shutter base plate.   
   
   
       24 . The focal plane shutter for cameras according to  claim 7 , wherein
 the synthetic resin material of the attachment shank has almost same coefficient of expansion of the synthetic resin material of the shutter base plate.   
   
   
       25 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   the synthetic resin material of the attachment shank is a material having lubricity.   
   
   
       26 . The focal plane shutter for cameras according to  claim 6 , wherein
 the synthetic resin material of the attachment shank is a material having lubricity.   
   
   
       27 . The focal plane shutter for cameras according to  claim 7 , wherein
 the synthetic resin material of the attachment shank is a material having lubricity.   
   
   
       28 . The focal plane shutter for cameras according to  claim 1 ,
 wherein   the shutter base plate and the attachment shank are manufactured by two color molding.   
   
   
       29 . The focal plane shutter for cameras according to  claim 6 , wherein
 the shutter base plate and the attachment shank are manufactured by two color molding.   
   
   
       30 . The focal plane shutter for cameras according to  claim 7 , wherein
 the shutter base plate and the attachment shank are manufactured by two color molding.