Claims
- 1. A zoom lens comprising at least, from an object side to an image side, first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power and a fourth lens unit of positive refractive power zooming from a wide-angle end to a telephoto end being performed by moving at least said first, second and fourth lens units in such a way that an air separation between said first and second lens units decreases, an air separation between said second and third lens units increases and an air separation between said third and fourth lens units decreases, said first lens unit consisting of a negative lens having a meniscus shape having a concave surface facing the image side, a negative lens and a positive lens having a meniscus shape having a convex surface facing the object side, said third lens unit having a positive lens and a negative lens and said fourth lens unit consisting of a negative lens and a positive lens, and having an aspheric surface.
- 2. A zoom lens according to claim 1, wherein said second lens unit includes, from the object side to the image side, a negative lens of meniscus shape having a strong negative refracting surface facing the image side, a positive lens and a positive lens having a convex surface facing the object side.
- 3. A zoom lens according to claim 1, wherein said third lens unit remains stationary during zooming.
- 4. A zoom lens according to claim 1, wherein said second and fourth lens units move in unison toward the object side when zooming from the wide-angle end to the telephoto end.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-078433 |
Feb 1992 |
JPX |
|
4-144746 |
May 1992 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/022,156, filed Feb. 23, 1993, abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (8)
Number |
Date |
Country |
49-23912 |
Jun 1974 |
JPX |
53-34539 |
Mar 1978 |
JPX |
54-14403 |
Apr 1980 |
JPX |
57-163213 |
Oct 1982 |
JPX |
58-4113 |
Jan 1983 |
JPX |
63-241511 |
Oct 1988 |
JPX |
1193709 |
Aug 1989 |
JPX |
2201310 |
Aug 1990 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
22156 |
Feb 1993 |
|