Title:
OPHTHALMIC IMAGING APPARATUS
Document Type and Number:
Japanese Patent JP3630795
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately and simply perform alignment by automatically performing the fine adjustment of alignment and reducing the load of a subject to avoid the failure of photographing.
SOLUTION: When a fine adjustment starting switch 5 is pushed after the completion of rough adjustment, the fundus image by fundus illumination light passes through an object lens 8, a perforated mirror 9, a focus matching lens 10, a photographing lens 11, a changeover mirror 12, a field lens 18, a half mirror 19 and a television lens 22 to be formed on the imaging element of a television camera 23 and the formed fundus image is inputted to an image processing part 24 to be displayed on a television monitor 26. The image processing part 24 measures the brightnesses of a plurality of the regions in the fundus image to transmit these brightness data to a judge processing part 25. The judge processing part 25 compares a preliminarily stored threshold value with the quantities of light of the respective regions or mutually compares the brightness of the respective regions to determine the moving direction of a measuring part 3 to move the measuring part 3.
Inventors:
Tetsuji Ogawa
Application Number:
JP25024595A
Publication Date:
March 23, 2005
Filing Date:
September 04, 1995
Export Citation:
Assignee:
Canon Inc
International Classes:
A61B3/14; A61B3/10; (IPC1-7): A61B3/14; A61B3/10
Domestic Patent References:
| JP5095905A | ||||
| JP62189045A | ||||
| JP64058238A |
Attorney, Agent or Firm:
Yasuhiko Hibiya