摘要:
The present invention relates to a multilayer optical disc having, as an intermediate layer, a cured product layer of an ultraviolet-curable resin composition containing an urethane (meth)acrylate (A) having one or two (meth)acrylate groups in one molecule obtained by reacting a monofunctional or bifunctional organic isocyanate (a) having a molecular weight of 350 or less with a mono(meth)acrylate (b) having a hydroxy group, a (meth)acrylate monomer (B) and a photopolymerization initiator (C), where the content of the (A) component is 5 to less than 40% by weight based on the total amount of the (A) component and the (B) component and the rest is (B), and to a resin composition for said cured product layer. Said resin composition has characteristics that it has a smaller variation in warp before and after curing the above-described resin composition when it is formed into the above-described intermediate layer, it is suitable for shaping a substrate by a 2P method because it allows good detachability of a stamper after curing, it is excellent in mass production of multilayer optical discs, and that the obtained optical disc therefrom has a smaller variation in warp before and after durability test under high temperature and high humidity.
摘要:
The UV-curable resin compositions for optical discs are characterized in that they comprise (A) 15-70 wt % of a (meth)acrylate monomer that has an ethylene oxide chain in the molecule, (B) 5-50 wt % of a urethane (meth)acrylate, (C) 2-50 wt % of an epoxy (meth)acrylate, and (D) 1-10 wt % of a photopolymerization initiator, in the resin composition. The glass transition temperature of cured films thereof is 10-65° C., and the maximum value of the dynamic loss factor tan δ of the cured films is in the range of 0.35-0.73.
摘要:
When the change speed is instructed, without changing value of a suppressing vibration flag set to value 1 as initial value, a fast fill as the preparation of a brake to be engaged when the change speed is executed and low pressure standby of hydraulic pressure to set the brake in a half-engaged state. Then the suppressing vibration flag is set to value 0 when a predetermined time passed since the change speed is instructed, a sum of a drive torque required for driving and a suppressing vibration torque, which is in the same direction as suppressing rotational fluctuation of a drive shaft, is output from a motor when the suppressing vibration flag is set to value 1.
摘要:
When the change speed is instructed, without changing value of a suppressing vibration flag set to value 1 as initial value, a fast fill as the preparation of a brake to be engaged when the change speed is executed and low pressure standby of hydraulic pressure to set the brake in a half-engaged state. Then the suppressing vibration flag is set to value 0 when a predetermined time passed since the change speed is instructed, a sum of a drive torque required for driving and a suppressing vibration torque, which is in the same direction as suppressing rotational fluctuation of a drive shaft, is output from a motor when the suppressing vibration flag is set to value 1.
摘要:
A rotating heating roller includes a laminated core and four circumferential yokes provided on the core. A three-phase winding is mounted on the leg core between the yokes. The winding is divided into three coils and adjacent end parts of the coils are overlapped. These overlapped coil parts generate a higher induced electromotive force when excited than that of the non-overlapped coil parts. The higher electromotive force contributes to a uniform distribution of the surface temperature of the rotating roller.