FOCAL POINT ADJUSTING METHOD AND FOCAL POINT ADJUSTING DEVICE IN IMAGING APPARATUS

摘要

First and second test charts (CH1, CH2) each having an imaging pattern defined by white color and black color are set in front and rear of the target position (P) of an object, a focus lens (3) is moved in the direction of optical axis X, focal point evaluation value of the imaging pattern focused on an image element (5) is determined for each of the first and second test charts (CH1, CH2) in correspondence with the movement quantity of the focus lens (3), and the position of the focus lens (3) is set such that the focal point evaluation value in the first test chart (CH1) coincides with the focal point evaluation value in the second test chart (CH2).