What Is a Rotary Solenoid?

The deflection coil is an important component of the CRT picture tube, which is used to realize the image field scanning function. The deflection coil is sleeved on the cone portion of the picture tube and connected to the scanning circuit on the substrate.

The deflection coil is composed of a pair of horizontal coils and a pair of vertical coils. Each pair of coils has the same number of turns and the shapes are exactly the same

The replacement of the deflection coil needs to pay attention to the following points:

1. Before removing the deflection yoke, first record the connection position and static convergence of the four different colored wires of the yoke

The deflection magnetic field is formed by a sawtooth current flowing through the deflection coil. carry out

The principle of television imaging The ordinary picture tube of a television is also called a cathode ray tube. The cathode ray tube is mainly composed of five parts: an electron gun, deflection coils, and a shadow mask. Phosphor layer and glass shell. The display image is generated by the electron gun emitting electrons moving at high speed to excite the phosphor on the fluorescent screen to generate light. After the electrons are emitted from the electron gun, we must constrain the trajectory of the electron to make the electron reach a specific point on the screen. The deflection yoke of the image displayed on the control screen is this function. The changing magnetic field generated by the deflection yoke controls the running direction of the electrons and thus the running trajectory of the electrons. ^[3]