Title:
広角レンズ及び広角レンズを搭載するシステム
Document Type and Number:
Japanese Patent JP4797115
Kind Code:
B2
Abstract:
Conventional wide angle lenses each do not have such features that an optical length is short, a back focus is long to the extent possible, a good image is obtained, and sufficient brightness is provided. In other words, it is difficult to perform sufficient correction of chromatic aberration and achieve sufficient downsizing. Provided is a wide angle lens provided with a first lens L1, a second lens L2, a third lens L3, an aperture stop S, and a fourth lens L4. The wide angle lens is configured by arranging the first lens L1, the second lens L2, the third lens L3, the aperture stop S, and the fourth lens L4 in this order from the side of an object toward the side of an image. The first lens L1 is a meniscus lens having a negative refractive power, the convex surface of which faces the side of the object. The second lens L2 is a meniscus lens having a positive refractive power, the convex surface of which faces the side of the image. The third lens L3 and the fourth lens L4 are lenses having the positive refractive power.
Inventors:
Do Satoshi
Application Number:
JP2010276603A
Publication Date:
October 19, 2011
Filing Date:
December 13, 2010
Export Citation:
Assignee:
Do Satoshi
International Classes:
G02B13/04; G02B13/18
Domestic Patent References:
| JP2005173346A | ||||
| JP11326757A |
Foreign References:
| US5504618 |
Attorney, Agent or Firm:
Takashi Ogaki
Hiroyuki Okada
Hiroyuki Okada