Light beam emitting device, optical scanner, and image forming apparatus

摘要: PROBLEM TO BE SOLVED: To maintain perpendicularity of a light source member with respect to an optical axis beam emitting device.SOLUTION: A device includes 2 having plurality spots 2a 2h, and holding 1 that regulates emission directions beams emitted from the upon contact first part 1m, second 1j, third 1k source; part, such that: angle β1 formed by straight line K1 connecting, spots, most separated two K2 connecting becomes smaller than β2 K3 β3 fourth K4 line, distance D1 between longer D2 D3 part.