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Focal-plane shutter and optical apparatus

A focal plane shutter, electromagnet technology, applied in the shutter, optics, aperture and other directions, can solve problems such as blade speed changes, and achieve the effect of suppressing blade speed changes

Active Publication Date: 2012-05-23
SCI ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause changes in blade speed

Method used

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  • Focal-plane shutter and optical apparatus
  • Focal-plane shutter and optical apparatus
  • Focal-plane shutter and optical apparatus

Examples

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Embodiment Construction

[0024] Embodiments will be described below with reference to the drawings. In this embodiment, a focal plane shutter is described as an example of a blade drive device. figure 1 is a front view of the focal plane shutter according to the present embodiment. Such as figure 1 As shown, focal plane shutter 1 includes: plate 10; blades 21a to 24a and 21b to 24b; drive arms 31a, 32a, 31b and 32b; and electromagnets 70A and 70B. The board 10 is made of synthetic resin, and has an opening 11 in a rectangular shape. Each blade 21a to 24a and 21b to 24b is made of synthetic resin, and is formed thinly. In addition, each driving arm 31a, 32a, 31b, and 32b is made of a metal plate to maintain its strength. Each blade 21 a to 24 a and 21 b to 24 b moves between a position withdrawn from the opening 11 and a position covering at least a part of the opening 11 .

[0025] The four blades 21a to 24a constitute the front blade 20A. The four blades 21b to 24b constitute the rear blade 2...

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Abstract

A focal-plane shutter includes an electromagnet (70B), a board 10 having an aperture (11), a back curtain (20B) for opening or closing the aperture (11), and a back curtain driving lever (40B). The back curtain driving lever (40B) holds an iron piece (46b) to be attracted by the electromagnet (70B), is capable of moving such that the iron piece (46b) is in contact with or away from the electromagnet (70B), is biased by a spring (54B) such that the iron piece (46b) is away from the electromagnet (70B), and drives the back curtain (20B). Furthermore, the focal-plane shutter includes a holding plate (90) provided with a pair of elastic-deformable holding parts (92b) and (95b) for holding the electromagnet (70B) therebetween, and this holding plate (90) is placed facing the board (10). In addition, the electromagnet (70B) has limitation parts (72b4) that are fitted in the board (10), thereby limiting the movement of the electromagnet (70B) in a direction where the iron piece (46b) is away from the electromagnet (70B).

Description

technical field [0001] The invention relates to a focal plane shutter and an optical device. Background technique [0002] A focal plane shutter includes: an electromagnet; a plate having an opening; blades capable of opening and closing the opening; and a driving element that drives the blades. The drive element holds an iron piece that is attracted by the electromagnet and is movable so that the iron piece moves towards and away from the electromagnet and is biased by a drive spring so that the iron piece moves away from the electromagnet. Patent Document 1 discloses such a focal plane shutter. [0003] prior art literature [0004] patent documents [0005] Patent Document 1 Japanese Unexamined Patent Application Publication 9-133944. Contents of the invention [0006] The problem to be solved by the present invention [0007] High speeds of the blades are required in incoming focal plane shutters. In the case where the spring force of the driving spring is incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B9/36
CPCG03B9/36G03B9/02G03B9/08
Inventor 高桥裕士中野洋一
Owner SCI ENERGY CO LTD
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