Title:
【発明の名称】EVFレンズ
Document Type and Number:
Japanese Patent JP2806104
Kind Code:
B2
Abstract:
PURPOSE:To provide a small-sized optical system with superior optical performance by suppressing an increase in the overall length of the electronic viewfinder(EVF) lens, used as the viewfinder of a video camera, due to a decrease in magnifying rate. CONSTITUTION:A 1st lens 1 in a right-left symmetrical negative aspherical surface shape and a 2nd lens 2 in a right-left symmetrical positive aspherical surface shape are arranged between a side which is close to an object plane 3 and an eye point 4, and then -2.0<=epsilon1h1.0 and epsilon2=0.5Xepsilon1-0.5 hold, where epsilon1 and epsilon2 are cone coefficients representing the aspherical surface shapes of the 1st and 2nd lenses.
More Like This:
| JPH0273324 | COLLIMATOR LENS |
| JPS5232345 | OBJECTIVE LENS |
Inventors:
Tadao Kawamoto
Application Number:
JP28436891A
Publication Date:
September 30, 1998
Filing Date:
October 30, 1991
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G02B9/10; G02B13/18; G02B25/00; H04N5/225; (IPC1-7): G02B25/00; H04N5/225
Domestic Patent References:
| JP4168408A | ||||
| JP1257817A |
Attorney, Agent or Firm:
Tomoyuki Takimoto (1 person outside)