Printing apparatus, printing method, and computer storage medium

A method, comprising:

• emitting, by a light-emitting device of a printing apparatus, printing light;
• reflecting, by a concave arc surface of a reflector of the printing apparatus, the printing light;
• changing an emission direction of the printing light to a plurality of directions to cause the printing light being reflected at different positions of the concave arc surface to generate reflected light having different exit directions;
• and
• directly sensing, by a light-sensing surface of a light-sensing device of the printing apparatus, the reflected light without being refracted by an intermediate optical component to generate a plurality of continuously distributed light spots on the light-sensing surface with any adjacent light spots equally spaced apart.

A method, comprising:

• emitting, by a light-emitting device of a printing apparatus, printing light;
• reflecting, by a concave arc surface of a reflector of the printing apparatus, the printing light at different positions of the concave arc surface to generate reflected light having different exit directions;
• driving the reflector to rotate, wherein a rotation round of the reflector corresponds to row-printing cycles that have a cycle number same as a number of concave arc surfaces in the reflector;
• and
• directly sensing, by a light-sensing surface of a light-sensing device of the printing apparatus, the reflected light without being refracted by an intermediate optical component to generate a plurality of continuously-distributed light spots on the light-sensing surface with any adjacent light spots equally spaced apart.