Title:
【発明の名称】撮像光学系
Document Type and Number:
Japanese Patent JP3128125
Kind Code:
B2
Abstract:
PURPOSE:To make a camera thin in the front-rear direction by using a prism which receives and reflects image pickup incident luminous flux by an incidence surface and projects it from a reflecting projection surface, and providing a light shield part except in the effective luminous flux passing area of the prism. CONSTITUTION:The optical system consists of an objective optical system 1 and the prism 2 which receives the luminous flux projected by the objective optical system 1 on the incidence surface 2a, reflects the light totally by the reflecting projection surface 2b toward a reflecting surface 2c, are further projecting the light from the reflecting projection surface 2b after the reflection, and the luminous flux projected from the reflecting projection surface 2b is imaged on an image pickup surface 3. Then light shield films 4 and 5 are provided except in the effective luminous flux passing areas of the incidence surface 2a and reflecting projection surface 2b to cut harmful light which strikes on the image pickup surface 3 after being reflected by the internal surfaces in the prism 2 repeatedly. Consequently, the optical axis is bent in the prism 2, so the front-rear thickness of the camera is reducible.
Inventors:
Hiroshi Takase
Application Number:
JP2769590A
Publication Date:
January 29, 2001
Filing Date:
February 07, 1990
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
G02B9/16; G02B17/08; G02B27/00; H04N5/225; (IPC1-7): G02B17/08; G02B9/16; G02B27/00; H04N5/225
Domestic Patent References:
| JP1200316A | ||||
| JP57180301U | ||||
| JP59109321U | ||||
| JP59184102U |
Attorney, Agent or Firm:
Taiji Shinohara (1 person outside)