| 摘要 |
<p>An optical lens device is provided with a first lens (10) having a positive focal length and a second lens (20) having a negative focal length and the lenses (10, 20) are disposed so as to be laminated with their optical axes aligned. In the lenses (10, 20) the radius of curvature of the lens surface on the side to which light is incident is smaller than that on the side from which light exits, and the peripheries thereof are provided with edge parts (18, 28). Furthermore, in the edge parts (18, 28), axial direction center parts (Q1, Q2), which are parallel to the optical axis at the peripheral part of the edge parts, are formed so as to be positioned more to the light exiting side than the lens center parts (O1, O2) and the center parts (P1, P2) in the axial direction at the peripheral parts of the lenses. Thus, changes in lens characteristics accompanying changes in temperature are suppressed without increasing the number of components.</p> |
