Login| Sign Up| Help| Contact|

Patent Searching and Data

Document Type and Number:
Japanese Patent JP3290467
Kind Code:

PURPOSE: To make the depression angle range large and make operation possible at ease by arranging an image erecting means closely by a reflection optical member so that the luminous flux from the reflection optical member can be made incident.
CONSTITUTION: A prism 33 consists of a D prism 33a and a depression-view prism 33b for twice reflection and has a surface S which splits the incident luminous flux at a 45° and a 0° angle of transmission and deflection. A Porro prism 35 is constituted into a Porro prism type 2 by using an incidence-side right-angled prism 35a, an intermediate right-angled prism 35b, and a projection- side right-angled prism 35c. This Porro prism 35 is arranged closely by the depression view prism 33b so that the luminous flux from the depression-view prism 33b can be made incident. Further, the reflecting surface (c) of the projection-side right-angled prism 35c is set to larger area than the reflecting surface (a) of the incidence-side right-angled prism 35a and the optical member from this Porro prism 35 to an ocular 38 is stored in an ocular lens barrel.

Nobuaki Kitajima
Kazutoshi Takagi
Application Number:
Publication Date:
June 10, 2002
Filing Date:
June 15, 1992
Export Citation:
Click for automatic bibliography generation   Help
Topcon Co., Ltd.
International Classes:
A61F9/00; A61B19/00; G02B21/20; G02B21/22; (IPC1-7): G02B21/20; A61B19/00; A61F9/00
Domestic Patent References:
Attorney, Agent or Firm:
Tamio Nishiwaki