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Patent Searching and Data


Title:
OPTICAL SYSTEM WITH GRATING ELEMENT AND IMAGE PICKUP DEVICE USING THE SYSTEM
Document Type and Number:
Japanese Patent JP2000028913
Kind Code:
A
Abstract:

To compensate chromatic aberration without increasing the constituting number of a lens by arranging a 1st lens having negative refractive power and a 2nd lens having positive refractive power in order from an object side and forming a grating element surface on at least one surface of the 2nd lens.

The 1st lens 1, the 2nd lens 2, and a glass plate 4 and an image surface 5 optically equivalent to a crystal filter and the face plate of the image pickup device are arranged in this order from the object side. This optical system with a grating element is constituted by using the 1st lens 1 whose emitting surface is concave and which has the negative refractive power and the 2nd lens 2 whose incident surface is convex and which has the positive refractive power. In such a case, the grating element surface 40 having the positive refractive power is provided on the emitting surface of the 2nd lens 2. The 2nd lens 2 having the grating element surface 40 constituted in kinoform shape is formed by glass molding. Thus, a lens excellent in transferability is obtained.


Inventors:
BOKU KAZUTAKE
ONO SHUSUKE
Application Number:
JP15760299A
Publication Date:
January 28, 2000
Filing Date:
September 13, 1996
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G02B9/00; G02B13/18; (IPC1-7): G02B9/00; G02B13/18
Attorney, Agent or Firm:
Hiroyuki Ikeuchi (1 person outside)