English to French Tech/Engineering Patents imaging apparatus

a SHIFT pattern determining unit configured to determine a SHIFT pattern of the image-space distance, such that the focal point moves from one end to an other end of a predetermined range of focus during an exposure period of which duration is the exposure time, the image-space distance being SHIFTED by said shift control unit, and the shift pattern being found in a frame period including the exposure period,

"a shift speed of the image-space distance increases from zero during an acceleration period included in the frame period;
the image-space distance shifts at a constant speed during a constant speed period included in the frame period and following the acceleration period;"

"une vitesse de changement de la distance espace-image augmente de zéro pendant une période d’accélération incluse dans la période de trame ;
la distance espace-image CHANGE à une vitesse constante pendant une période à vitesse constante incluse dans la période de trame et suivant la période d’accélération ;

j'ai traduit shift par changer !!