Mitsubishi Denki Kabushiki Kaisha

Hiroaki Nishino

Yoshinori Miyamoto

Hironobu Yasui

Akinori Heishi

Akira Ishimori

Yuji Nakahara

Nobuaki Miyake

Yutaka Ono

An image distortion correcting device with reduced cost and reduced consumption power is provided. Horizontal correction coils (L ) and (L ) are wound around partial cores ( ) and ( ). The two horizontal correction coils (L ) and (L ) are wound in such winding directions that they produce magnetic fields in opposite directions. A bobbin ( ) having an insulating property covers the partial cores ( ) and ( ) and magnets ( ) and ( ) in the winding direction of the horizontal correction coils (L ) and (L ), and a vertical correction coil (L ) is wound on the bobbin ( ) around the partial cores ( ) and ( ) along the windings of the horizontal correction coils (L ) and (L ). That is to say, the vertical correction coil (L ) is wound over the horizontal correction coils (L ) and (L ) along the periphery of their windings with the bobbin ( ) interposed therebetween. This vertical correction coil (L ) is wound in such a direction that it produces a magnetic field directed to cancel the bias magnetic field produced by the magnets ( ) and ( ).

Image distortion correcting device

An image distortion correction circuit is provided in which a horizontal deflection current (IH) flows through horizontal correction coils (L,, L,) and a vertical deflection current (IV) flows through either of vertical correction coils (L,, L,). The vertical correction coils (L,, L,) and the horizontal correction coils (L,, L,) are wound on the same core (,). A pair of magnets (,) on opposite ends of the core (,) apply a biased magnetic field from the north pole toward the south pole. The anode of a diode (D,), the cathode of a diode (D,) and a first end of a resistor (R,) are connected to an intermediate terminal (P,) through which the vertical deflection current (IV) flows. A first end of the vertical correction coil (L,) is connected to the cathode of the diode (D,). A second end of the resistor (R,) and a terminal (P,) are connected to a second end of the vertical correction coil (L,). A first end of the vertical correction coil (L,) is connected to the terminal (P,), and a second end of the vertical correction coil (L,) is connected to the anode of the diode (D,). The image distortion correction circuit minimizes the degradation of vertical deflection sensitivity to perform an intermediate pin distortion correction.

Image distortion correction circuit

A deflection yoke includes a hollow funnel-shaped tapered piece, a first set of winding hooks provided on a small-aperture portion of the tapered piece, a second set of winding hooks provided on a large-aperture portion of the tapered piece, and a deflection coil including first through n-th winding bundles. The first winding bundle includes a bundle of conductor wound onto a center winding hook at the center of the first set of winding hooks and onto the second winding hooks. The second winding bundle includes a bundle of conductor wound onto the center winding hook, the winding hooks adjacent thereto on either side, and onto the second winding hooks. The third and subsequent winding bundles include bundles of conductors wound onto the center winding hook, a plurality of winding hooks adjacent thereto on either side, and onto the second winding hooks. The first through n-th winding bundles are wound onto the first set of winding hooks in a same direction, and aligned on the first set of winding hooks. The first through n-th winding bundles are arranged in an order such that the first winding bundle is closest to an end of the small-aperture portion of the tapered piece, and the n-th bundle is farthest from the end of the small-aperture portion of the tapered piece.

Deflection yoke

Growing community of inventors

Tokyo, Japan

Hiroaki Nishino