| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection zoom lens which is compact and has high optical performance optimum for enlarging and projecting a bright and high-definition image. SOLUTION: The projection zoom lens 100 is configured to arrange, in order from an enlargement side, a first lens group G<SB>11</SB>having negative refractive power, a second lens group G<SB>12</SB>having positive refractive power, a third lens group G<SB>13</SB>having positive refractive power, a fourth lens group G<SB>14</SB>having negative refractive power, a fifth lens group G<SB>15</SB>having positive refractive power and a sixth lens group G<SB>16</SB>having positive refractive power. The second lens group G<SB>12</SB>, the third lens group G<SB>13</SB>, the fourth lens group G<SB>14</SB>, and the fifth lens group G<SB>15</SB>are moved to the enlargement side along an optical axis, to vary the power from the wide angle end to the telephoto end. Further, the projection zoom lens 100 satisfies a predetermined condition to thereby have higher optical performance. COPYRIGHT: (C)2008,JPO&INPIT
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