| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive scanning optical device which shortens a cylinder adjustment time and lower the cost for cylinder adjustment as a scanning optical device which performs the cylinder adjustment. SOLUTION: The scanning optical device which performs the cylinder adjustment is provided with cylindrical lens abutting surfaces, formed integrally with an optical box, along the optical axis of a cylindrical lens; and three specific positions of the cylindrical lens are constituted while the cylindrical lens is abutting against one abutting surface or including a specific position between the abutting surfaces and the position of the cylindrical lens is determined among the three positions.
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