发明名称 |
Automatic focusing apparatus |
摘要 |
An automatic focusing apparatus repetitively detects a defocus amount of a photographing lens, discriminates whether or not an object is moving, and calculates a pursuit correction amount for a moving object on the basis of present and previous defocus amounts. When a non-moving object is discriminated, a drive amount of the lens is calculated on the basis of the present defocus amount, and when a moving object is discriminated the drive amount is calculated on the basis of a pursuit drive amount as a sum of the present defocus amount and the pursuit correction amount. A pursuit enable/disable determining device determines whether the drive amount is calculated on the basis of the discrimination result or on the basis of the present defocus amount. When a drive direction of the lens is reversed, the pursuit enable/disable determining device causes calculation of the drive amount of the photographing lens on the basis of the present defocus amount for driving the lens in a predetermined number of drive operations after the reversal.
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申请公布号 |
US5510873(A) |
申请公布日期 |
1996.04.23 |
申请号 |
US19950442878 |
申请日期 |
1995.05.17 |
申请人 |
NIKON CORPORATION |
发明人 |
KUSAKA, YOSUKE;MURAMATSU, MASARU;UTAGAWA, KEN;YAMANO, SHOZO |
分类号 |
G02B7/36;(IPC1-7):G03B13/00 |
主分类号 |
G02B7/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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