Velocity modulation device and projection type display unit

It is capable of independently modulating the scanning velocities of multiple electron beams having a beam interval. Allowing a current to pass through the velocity modulation coils results in modulation of the scanning velocities of the multiple electron beams ( 19 A, 19 B) emitted from electron guns contained in a neck portion of a cathode ray tube to sharpen the outline of picture. The velocity modulation coils have a coil configuration including three upper coils ( 27 A, 27 B, and 27 C) and lower three coils ( 28 A, 28 B, and 28 C) for respectively generating asymmetrical quadri-pole magnetic fields. The magnetic fields independently generated by these two types of the velocity modulation coils allows the scanning velocities of the multiple electron beams ( 19 A, 19 B) to be almost independently modulated.