| 摘要 |
An aperture device includes: a board including an opening; a step motor capable of stopping every predetermined rotational angle; an output member including first and second pins and rotating a predetermined range by the step motor; and first and second blades driven by the output member with first and second blades respectively engaging with the first and second pins, linearly moving in opposite directions, and covering the opening to adjust an aperture area of the opening; wherein an X-axis indicates a phantom line passing through a rotational center of the output member and extending in the moving directions of the blades, and when the aperture area is a minimum, an angle between a directional line, which connects the rotational center with the first pin, and the X-axis is from minus 20 degrees to plus 30 degrees.
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