Title:
IMAGE PICKUP UNIT FOR OCULAR IMAGE
Document Type and Number:
Japanese Patent JP3401502
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an image pickup unit for an ocular image by which the image is precisely photographed with simple constitution.
SOLUTION: This image pickup unit for the ocular image incorporates an objective lens 1, an imaging device 2 such as a CCD constituting an image pickup part, a light shielding part 3 and a light guiding part 4 as a basic constitution. The light shielding part 3 intercepts a part of a photographing optical path, and is concentrically provided with the optical axis 5 of a photographing optical system. The light guiding part 4 guides visible light from a visible light source to the side of the objective lens 1 from the middle of the photographing optical path. The cross section of the guided visible light 6 has a shape similar to the light shielding part 3, and a center thereof coincides with the optical axis 5. Also, the area rations of the cross section of the visible light 6 and the light shielding part 3 to the effective optical path cross section of the photographing optical system are set nearly equal or the area ratio of the visible light 6 is set to be a little larger.
Inventors:
Shuichi Horiguchi
Takayoshi Hasegawa
Takayoshi Hasegawa
Application Number:
JP2001209550A
Publication Date:
April 28, 2003
Filing Date:
July 10, 2001
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G03B15/00; A61B3/10; A61B3/14; A61B5/117; G06K9/00; G06T1/00; H04N5/225; (IPC1-7): A61B3/10; A61B3/14; A61B5/117
Domestic Patent References:
| JP114807A | ||||
| JP614884A | ||||
| JP105196A | ||||
| JP11347016A | ||||
| JP63197434A | ||||
| JP10505180A |
Attorney, Agent or Firm:
Shohei Oguri (4 outside)
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