| 摘要 |
An optical lens unit comprises an optical lens for focusing a light beam, a hollow cylindrical lens holder having, on an inner circumferential surface, a support section contacting one surface of the optical lens and supporting a circumferential part thereof, an elastic member interposed between the support section and the optical lens, and a lens fastener movable along an optical axis of the optical lens, clamping the optical lens jointly with the lens holder, and contacting, at one end, the other surface of the optical lens. The lens fastener pushes the circumferential part of the optical lens, thereby to deform the elastic member to adjust the position of a focal point of the optical lens.
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