Title:
【発明の名称】焦点検出装置
Document Type and Number:
Japanese Patent JP3371500
Kind Code:
B2
Abstract:
A focus detection device includes a sensor for detecting focus in at least two regions of an image field. The device further includes a photographic lens for receiving light from a source in the image field, and a field lens for receiving light from the photographic lens. The field lens is disposed between the photographic lens and the sensor, and includes a plurality of field lens elements for receiving light from the regions of the image field. At least two of the field lens elements are adjacent field lens elements corresponding to adjacent regions of the image field. The adjacent field lens elements are separated by a space to deflect stray light. A method of use also is described.
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Inventors:
Keiji Ohsawa
Application Number:
JP33045493A
Publication Date:
January 27, 2003
Filing Date:
December 27, 1993
Export Citation:
Assignee:
NIKON CORPORATION
International Classes:
G03B13/36; G02B7/28; G02B7/34; (IPC1-7): G02B7/34; G02B7/28; G03B13/36
Domestic Patent References:
| JP5150156A | ||||
| JP63131111A | ||||
| JP61119135U |