Mitsubishi Denki Kabushiki Kaisha

Kiyohiko Sato

Takashi Sugahara

In a cathode-ray tube, in order to readily and inexpensively reduce an alternating electric field irradiated by a deflection yoke to a front of the cathode-ray tube through a funnel part and a face panel, a conductive film for forming an electric field shield is formed from a neck part to a cone part of a glass bulb and is electrically connected to another conductive film formed on a funnel body part. The deflection yoke is mounted on the conductive film via an insulation sheet interposed therebetween. The conductive film is grounded to form an equipotential surface of 0 V in front of the deflection yoke. A transparent conductive film can be also formed on the external surface of the face panel to raise the reduction of the alternating electric field.

Cathode-ray tube having alternating electric field reduction device

A compound corrective lens for use in light exposure in the manufacture of color CRTs includes plurality of lens elements, each having an elementary surface, formed in combination a compound surface on the exit side of the lens, with steps formed at the boundaries between adjacent lens elements to connect edges of the elementary surfaces of the adjacent lens elements. The surfaces are so arranged that the steps falls from the elementary surface on the inner side closest to the optical axis of the lens) to the elementary surface on the outer side (farthest from the optical axis). With such an arrangement, the adverse effect of the steps covered with a light-absorbing layer is reduced. That is, the effective areas of the elementary surfaces are enlarged, and thus the distortion of the lens surface is suppressed.

Growing community of inventors

Nagaokakyo, Japan

Kiyohiko Sato