| 摘要 |
PURPOSE:To easily compensate a spherical aberration for colors at low cost by composing an aspherical cemented lens of a lens which has an aspherical cemented surface, a lens which forms a gap part with the aspherical cemented surface at the time of cementing, and a filler, etc., having nearly the same refractive index with the lens. CONSTITUTION:The aspherical cemented lens consists of the lens 12 which has the aspherical cemented surface 12a, the lens 11 which has the aspherical cemented surface 11a for forming the proper gap part with the aspherical cemented surface 12a when cemented, and the filler 13 or a cementing agent which is charged in the gap part at the time of the cementing and has nearly the same refractive index with the lens 11 having the spherical cemented surface 11a. Consequently, the aspherical cemented lens is obtained which has its spherical aberration compensated for colors effectively while the spherical aberration on a long-wavelength side (g ray) is easily prevented from being overcompensated by an inexpensive method.
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