| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an autofocus device improved in accuracy in specifying a focal position.SOLUTION: First and second amplifiers amplify a first signal voltage level to generate first and second amplified signals. Third and fourth amplifiers amplify a second signal voltage level to generate third and fourth amplified signals. A correction unit: generates a first corrected signal or a second corrected signal by correcting the first amplified signal or the second amplified signal using a first correction function representing a relationship between a voltage level of the first amplified signal and a voltage level of the second amplified signal; and generates a third corrected signal or a fourth corrected signal by correcting the third amplified signal or the fourth amplified signal using a second correction function representing a relationship between a voltage level of the third amplified signal and a voltage level of the fourth amplified signal.</p> |
