Title:
【発明の名称】焦点検出用光学装置
Document Type and Number:
Japanese Patent JP2586044
Kind Code:
B2
Abstract:
A focus detecting optical system is disclosed which includes an objective lens for forming an image of an object, a plurality of focus detecting blocks, and a focus condition calculating device for calculating a focus condition of the objective lens in accordance with the light intensity distribution signals produced by the plurality of the focus detecting blocks. Each of the focus detecting blocks includes a condenser lens located nearby a predetermined focal plane of the objective lens, a pair of image re-forming lenses located behind the condenser lens for reforming a pair of secondary images of the image formed by the objective lens, a mask plate having a pair of apertures through which light fluxes forming the secondary images pass and a light receiving unit for receiving the pair of the secondary images formed by the pair of image re-forming lenses to produce a light intensity distribution signal representative of the light intensity distribution of the secondary images. The apertures in the mask plate of at least one specified focus detecting block has a configuration different from that of the other focus detecting blocks.
More Like This:
| JP2004341040 | PHOTOGRAPHING DEVICE |
| WO/2007/073691 | IMAGE PICK-UP SYSTEM AND FOCUSING DEVICE |
| WO/2016/035643 | IMAGING DEVICE, IMAGING DEVICE BODY, AND LENS BARREL |
Inventors:
KARASAKI TOSHIHIKO
SUGITANI KAZUMI
SUGITANI KAZUMI
Application Number:
JP11936187A
Publication Date:
February 26, 1997
Filing Date:
May 15, 1987
Export Citation:
Assignee:
MINOLTA CO LTD
International Classes:
G03B13/36; G02B7/28; G02B7/34; (IPC1-7): G02B7/34; G03B13/36
Domestic Patent References:
| JP6280635A | ||||
| JP61295520A | ||||
| JP6031109A | ||||
| JP6060612A | ||||
| JP6096618U | ||||
| JP6036615U |
Attorney, Agent or Firm:
Aoyama Ryo (2 outside people)