| 摘要 |
A lens extension and retracting mechanism for use in a photographic camera of a folding type, including a lens board guided between a photographing position at a forward portion of a camera body and an accommodating position within the camera body, sun gears provided on the camera body, planetary arms coaxially rotating with respect to the sun gears, planetary gears provided on the planetary arms so as to be engaged with the sun gears, extension and retracting arms arranged to rotate simultaneously with the planetary gears and pivotally connected to the lens board, and an operating lever. The extension and retracting mechanism is capable of holding the lens board stably and positively.
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