PURPOSE:To provide a liquid crystal compsn which makes time division driving possible at a low voltage, consisting of the first liquid crystal (in which anisotropy of dielectric constant is negative), the second liquid crystal (in which said anisotropy is positive), and the third liquid crystal contg a specified liquid crystal compd exhibiting less temperature dependence of threshold voltage CONSTITUTION:The first liquid crystal (A) (which contains at least one compd of formula I wherein R1, R2 are each straight-chain alkyl and in which anisotropy of dielectric constant is negative), the second liquid crystal (B) (which consists of at least one compd of formula II, at least one compd of formula III and at least one compd of formula IV wherein R3, R4, R5 are each straight-chain alkyl and in which anisotropy of dielectric constant is positive), and the third liquid crystal (C) (which contains at least one compd of formula V wherein R6, R7 are each straight-chain alkyl), are mixed together to obtain a nematic liquid crystal compsn for an electric field effect type liquid crystal display apparatus which is applied watches, electronic calculators, etc This liquid crystal compsn makes time division driving possible at 3V or lower, exhibits excellent voltage margin, and further has excellent chemical stability, resistance to freeze at low temperature, etc

Liquid crystal composition

PURPOSE:To improve the workability, by mounting a plastic grill frame having a groove to a jig applied with high frequency heating, folding and inserting an end of a metallic net, melting the inside of the groove with welding through high frequency heating and welding the plastic and the metal. CONSTITUTION:The jig 2 having a high frequency induction heating coil 1 is mounted on a surface plate 3 and the plastic grill frame 4 is fitted to a prescribed position. The grill frame 4 has the groove 6 and a ridge 7 bending the end of the metallic net 5 is inserted into the groove 6. Then, a high frequency current flows to the coil 1 to heat up rapidly the bent ridge 7, which is pressed with a press plate 9 of a press machine 8 so as to protrude the bent ridge 7 of the metallic next to the lastic grill frame 4 and hardened with cooling. Thus, the workability and the yield are improved.

Method for fitting a metallic grill to plastic grill frame mounted on front surface of sound equipment

PURPOSE:To easily obtain a metal reinforcing rib without a special component part, supplement or particular process by bridging over a opening a metal wire for high-frequency induction heating to be installed along the surfaces to join a split semiconductor and by leaving the wire as a reinforcing rib after welding process. CONSTITUTION:In connection with a high-frequency induction welding for joining half cases 1a, 1b, a temporary fabrication is performed to hold a metal heating wire 6 along the jointing surfaces 5 and a high frequency is applied by a high frequency induction coil 7 and the metal wire 6 is heated and the joining surfaces 5 are welded. Then, the metal wire 6 is abandoned in the jointing surfaces 5 and is left without being cut at the edge surface 4a and remains as a reinforcing rib to bridge at the shorter diameter. The reinforcing rib as installed as above, being a thin metal wire, does not hinder air flow and can have a strength large enough.

Reinforcing device for hollow resin body

High frequency fusion welding method

Induction heating process

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High frequency fusion welding method

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Liquid crystal composition

Method for fitting a metallic grill to plastic grill frame mounted on front surface of sound equipment

Reinforcing device for hollow resin body

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Induction heating process

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