초록 ▼

A focus detection system for detecting a focus state of an object lens, includes an optical device for forming first and second light distributions corresponding to first and second images having light fluxes passing through the different parts of a pupila of the object lens. The positional relation

A focus detection system for detecting a focus state of an object lens, includes an optical device for forming first and second light distributions corresponding to first and second images having light fluxes passing through the different parts of a pupila of the object lens. The positional relationship between the two light distributions varies in accordance with the focus state of the object lens. First and second sensors sense the first and second light distributions. A signal processor for processing output signals from the first and second sensors detect the focus state of the object lens in accordance with the positional relationships between the two light distributions. The signal processor processes the signals from the first and second sensors in accordance with a predetermined formula to obtain the positional relationship between the two images to determine a degree of coincidence of the two light distributions. The signal processing means provides an output signal in accordance with the degree of coincidence of the two light distributions.

대표청구항 ▼

A focus detection system for detecting a focus state of an object lens, comprising: optical means for forming first and second light distributions respectively corresponding to first and second images having light reflective fluxes passing through the different parts of the object lens, whereby the

A focus detection system for detecting a focus state of an object lens, comprising: optical means for forming first and second light distributions respectively corresponding to first and second images having light reflective fluxes passing through the different parts of the object lens, whereby the positional relationship between said first and second light distributions varies in accordance with the focus state of the object lens; first and second sensing means for sensing said first and second light distributions, said first and second sensing means each having a plurality of sensor elements; and signal processing means for processing output signals from said first and second sensing means to detect the focus state of the object lens in accordance with the positional relationship between the two light distributions; said signal processing means processing the signals from said first and second sensing means in accordance with a predetermined formula to determine a degree of coincidence of the said light distributions, said signal processing means providing an output signal in accordance with the degree of similarity of said two light distributions, and said signal processing means detecting a focus state of the object lens by processing signals from two groups of sensor elements being provided in corresponding positions, and each having the same number of sensor elements, which number is smaller than the total number thereof.