Shutter device

Abstract

Provided is a shutter unit which performs secure shutter operation while deterring shutter blades from bounding in opening / closing operation and is arranged in a small space. This shutter unit has main blades 3 and 5 and subordinate blades 4 and 6 which can rotate and travel in the space formed of a shutter case 1 and a case lid 2 in opening / closing directions; and the main blades 3 and 5 are provided with extension projection parts 3d and 5d and braking members 2g and 1g made of shock-absorbing raw materials are arranged opposite closure-state termination positions of the extension projection parts 3d and 5d separately from their movement traces across slight gaps. When this shutter unit is driven from the opening state to the closure state, the main blades 3 and 5 suddenly stop at their termination positions and when the extension projection parts 3d and 5d are displaced along the optical axis, they abut against the braking members 2g and 1g to be braked, so that the main blades 3 and 5 and subordinate blades 4 and 6 are deterred from bounding.

Description

technical field [0001] The present invention relates to a structure of a shutter device that opens and closes an exposure opening through which photographic light passes. Background technique [0002] In the past, in the shutter device that drives the blade switch of the shutter to open and close the opening for exposure, after the blade of the shutter rotates (moves) at a high speed, when it reaches the open position or the closed position, it is very difficult to quickly stop the blade. prone to rebound. The bounce of the shutter blades is the cause of changes in the exposure level or light leakage, which is undesirable. Therefore, various shutter devices equipped with a mechanism for preventing the rebound of the shutter blades have been proposed. [0003] The curtain shutter disclosed in Japanese Unexamined Patent Application Publication No. 9-5831 has an elastic buffer member, and this buffer member drives the rear curtain slit blades or the front curtain slit blades ...

AI Technical Summary

Problems solved by technology

In this case, the relative positional relationship between the above-mentioned elastic buffer member and the above-mentioned shutter opening plate and shutter closing plate also has a great influence on the rebound effect, so it is also difficult to expect the specified effect of preventing rebound.

[0008] In addition, in the various devices disclosed in the above-mentioned Japanese Patent Application Publication No. 9-5831, the above-mentioned Patent Publication No. 2627904, and the above-mentioned Publication No. 62-3792, in order to arrange the above-mentioned elastic buffer member to be connected to the blade and the shutter plate member Relatively, it is necessary to increase the space in the direction of movement of the blades near the terminal position, which is disadvantageous for the miniaturization of the shutter device.

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