NEAR-ULTRAVIOLET IMAGING LENS AND NEAR-ULTRAVIOLET CAMERA

摘要

PPROBLEM TO BE SOLVED: To provide a near ultraviolet imaging lens that secures sufficient transmissivity, exhibits satisfactory aberration performance in a near ultraviolet area, and can be easily formed. PSOLUTION: This near ultraviolet imaging lens 1 includes a front group FR, a diaphragm St, and a rear group RE in this order from an object side. The lenses L6 and L7 of the respective front group lens FR and rear group RE, which are the closest to the diaphragm, are negative lenses having concave faces directed to the diaphragm St. The front group FR has a positive lens L1 and a negative lens L2 in this order from the object side. The lenses L8 to L10 of the rear group RE, other than the lens L7 closest to the diaphragm, are all positive lenses. Further, the glass material constituting the lenses L1 to L10 has transmissivity of 70% in the case of a thickness of 10 mm with respect to an i-line. PCOPYRIGHT: (C)2007,JPO&INPIT