Lens of variable focal length

Application Number: 00108906
Application Date: 2000.05.19
Publication Number: 1274858
Publication Date: 2000.11.29
Priority Information: 1999/5/20 JP 139759/1999; 1999/9/27 JP 272312/1999
International: G02B15/14
Applicant(s) Name: Konica Corp.
Inventor(s) Name: Ota Kohei;Yokota Minoru;Ito Masae
Patent Agency Code: 11038
Patent Agent: zhang zuchang
Abstract A zoom lens to form an image of an object with variable magnification, is provided with a first lens group having a positive refracting power, and a second lens group positioned closer to the image than the first lens group and having a negative refracting power. When the magnification is changed, a distance between the first lens group and the second lens group is changed. The first lens group comprises a 1-1 lens, a 1-2 lens and a 1-3 lens aligned in this order from the object. The zoom lens comprises at least two plastic lenses.