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Focal plane shutter for camera

a technology for camera shutters and focal planes, applied in shutters, instruments, optics, etc., can solve problems such as fine wear debris generation

Inactive Publication Date: 2014-10-02
COPAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration effectively prevents wear debris from entering the blade chamber, enabling miniaturization of the camera's surface and ensuring stable operation of the shutter mechanism.

Problems solved by technology

Thus, when the shutter is operated, the sliding, contact etc. in proximity to the elongated hole results in the generation of fine wear debris.

Method used

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  • Focal plane shutter for camera
  • Focal plane shutter for camera
  • Focal plane shutter for camera

Examples

Experimental program
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Effect test

embodiment 1

[0023]Embodiment 1 is described with reference to FIGS. 1 to 4. First, the configuration of the present embodiment is described with reference to FIGS. 1 and 2. As illustrated in FIG. 1, a base plate 1 has formed therein a rectangular aperture 1a. Note that because, as mentioned above, FIG. 1 shows only the left side half of the driving portion with the shutter seen from the subject side, the same applies to the aperture 1a. As illustrated in FIG. 2, a predetermined gap is provided on the back side of the base plate 1, and an intermediate plate 2 and an auxiliary base plate 3 are attached in sequence by appropriate means, thereby a forming a rear blade chamber between the base plate 1 intermediate plate 2 and a front blade chamber between the intermediate plate 2 and the auxiliary base plate 3. Apertures similar to aperture 1a, but not shown in the drawing, are also formed the intermediate plate 2 and the auxiliary base plate 3. Note that intermediate plate 2 and auxiliary base plat...

embodiment 2

[0040]Next, the configuration of embodiment 2 is described using FIGS. 5 to 8. First, the configuration of the present embodiment will be described with references to FIGS. 5 to 7. In the present embodiment, a rail is provided on the base plate 1 described in embodiment 1 so that the rear blade-use arm 15 operates in stable manner. Hence, the present embodiment will be described simply, and descriptions of areas already described in embodiment 1 will be omitted.

[0041]As illustrated in FIG. 5, the base plate 1 has a rail 1m formed on a back side thereof, between the elongated hole 1b and the elongated hole 1c. The rail 1m is formed to follow an operation path of the rear blade-use arm 15. As illustrated in FIG. 6, the rail 1m has end portions 1m-1 formed in a tapered shape and a central portion 1m-2 formed to be flat. The central portion 1m-2 of the rail 1m is formed to be higher than the wall portion 1k formed at the edge of the elongated hole 1c. In other words, the central portion...

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PUM

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Abstract

A focal plane shutter for a camera which is suitable for miniaturization and arranged to prevent wear debris from entering into a blade chamber via a base plate hole. Wall portions (1j and 1k) are formed protruding towards the blade chamber side surface from edges of the elongated holes (1b and 1c) provided in a base plate (1). Rear blade-use arms (14 and 15) have step-like bent portions (14b and 15a) formed therein so that a tip end side of the arms is positioned further toward the base plate (1) than the rotation center side. During operation, the bent portions (14b and 15b) allow a small gap to be maintained between the wall portion (1k) and the rear blade-use arms (14 and 15). The freedom in determining the layout is not restricted so that miniaturization of the device is possible and entry of debris into the blade chamber is suppressed.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a focal plane shutter for a camera in which light-shielding blades are constructed from a plurality of arms pivotally attached to a base plate with at least one blade pivotally supported by each arm.BACKGROUND ART[0002]The light-shielding blades in the focal plane shutter for a camera are constructed from a plurality of arms pivotally attached to a base plate with at least one blade pivotally supported by each arm. When the arms are caused to rotate back and forth within a predetermined angular range, the blades operate between a position at which the focal plane is covered and a position of withdrawal from in front of the focal plane. The light-shielding blade constructed in this way is caused to operate through a linkage to a driving member that is attached to the base plate and rotates back and forth through a predetermined angle. Since the driving member is attached to a surface outside the blade chamber of the base pl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03B9/10
CPCG03B9/10G03B9/20G03B9/36
Inventor KAWAKAMI, KENTA
Owner COPAL CO LTD