Blade driving device, camera, and portable electronic device

Abstract

The present invention relates to a blade driving device, a camera, and a portable electronic device. In an optical device having a blade mounted on a lens or a space in the lens, the use of a shape memory alloy in the driving portion enables miniaturization and weight reduction of the entire mounted device, simplified driving, and simplified assembly. The blade driving device (100) includes: a base member (10) supporting the blade; a blade (21); a plate member (22) having a diameter and constituting a blade chamber; a plate member (23) with a caliber that constitutes a blade chamber and coversthe blade; a ring member (30) which is rotatably supported by a shaft and includes a connection portion (31) connected to the blade; an elastic member (40) held by the base member and the ring member; a shape memory alloy (50) held on the base member and the ring member; a holding member (51) for holding the shape memory alloy; and a wiring (70) for power supply.

Description

technical field [0001] The present invention relates to an invention related to a blade driving device and the like used in an imaging device and the like. Background technique [0002] With the rapid development of photographic technology, blade drive devices and lens drive devices are widely used in numerous photographic devices. The application of optical devices with blade drive devices to various portable electronic devices, such as cellular phones, tablet computers, etc., is especially accepted by consumers. [0003] The blade drive device is a device that drives one or more blades to change the state of the opening. It is used in various optical units such as cameras as shutters, apertures, apertures and shutters, filters, etc. The blade driving device mounted on or in the lens driving device, etc., on an optical device that moves the lens, due to the size and weight of the driving part of the blade driving device, protrusions in multiple directions depending on the ...

AI Technical Summary

Problems solved by technology

[0004] Although there are moving units using shape memory alloys with a small structural footprint, it is necessary to increase the length of shape memory alloys when a large amount of change is required

[0005] In addition, when using a shape memory alloy, if one of the two ends is directly fixed to the member for driving the blade, it must be movable together with the energization path, thereby requiring an inefficient space for the movable amount of the energization path. The path may become a disturbance factor beyond the necessary amount of stretching, thus potentially affecting the actuation of the member used for blade actuation

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