【発明の名称】映像光学系

Title:

【発明の名称】映像光学系

Document Type and Number:

Japanese Patent JP2846821

Kind Code:

B2

Abstract:

An optical imaging system having a simple optical shading filter for reducing various aberrations is disclosed. The optical imaging system includes one or more lenses, a stop installed between the lenses, and an optical shading filter for reducing the extra axial aberrations. The optical shading filter is an gradual optical shading filter having a transmittance which deceases cuing toward the peripheral portions. The optical imaging system is simple in its structure, and is effective in its function. Further, the manufacturing is easy, and the manufacturing cost is low.

Inventors:

SAI KANBUN

Application Number:

JP28383294A

Publication Date:

January 13, 1999

Filing Date:

November 17, 1994

Export Citation:

Click for automatic bibliography generation Help

Assignee:

DAIU DENSHI KK

International Classes:

G02B9/04; G02B5/00; G02B5/20; G02B27/00; G02B27/58; (IPC1-7): G02B9/04; G02B5/00

Domestic Patent References:

JP4211215A

Attorney, Agent or Firm:

Tadahiko Ito (1 outside)

Previous Patent: 光ピックアップシステムにおける焦点エラーを検出する凸凹状の非点収差�...

Next Patent: ２層フローティングゲート構造のマルチビット対応セルを有する不揮発性�...