Abstract: An over-current protection device includes first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer includes a polymer matrix, and a conductive filler. The polymer matrix has a fluoropolymer. The total volume of the PTC material layer is calculated as 100%, and the fluoropolymer accounts for 47-62% by volume of the PTC material layer. The fluoropolymer has a melt viscosity higher than 3000 Pa·s.

Abstract: An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a polymer matrix and a first conductive filler. The polymer matrix includes a polyolefin-based polymer and a fluoropolymer. The fluoropolymer has a melt flow index higher than 1.9 g/10 min, and the polyolefin-based polymer and the fluoropolymer together form an interpenetrating polymer network (IPN). The first conductive filler has a metal-ceramic compound dispersed in the polymer matrix.

Abstract: An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as ?-PVDF, ?-PVDF and ?-PVDF. The total amount of ?-PVDF, ?-PVDF and ?-PVDF is calculated as 100%, and the amount of ?-PVDF accounts for 48% to 55%. The conductive filler has a metal-ceramic compound.

Abstract: An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as ?-PVDF, ?-PVDF and ?-PVDF. The total amount of ?-PVDF, ?-PVDF and ?-PVDF is calculated as 100%, and the amount of ?-PVDF accounts for 33% to 42%.

Abstract: An inspection device for the position of trademark on integrated circuit board is disclosed. The inspection device comprises an inspection plate made from a transparent acrylic material having a plurality of inspection engraving lines thereon and a plurality of position holes; and a base seat having mounted with a plurality of position pegs which correspond to the position holes on the inspection plate; thereby a pin platform for inspection is positioned between the base seat and the inspection plate and the inspection line is corresponding to the trademark on the surface of the integrated circuit (IC) to proceed with the inspection.

Abstract: An optical subassembly includes an optical sleeve (1), a lens holder (2) having a cylindrical cavity (21) defined therein, and an optical element (4) received in the cavity. A stepped fixing hole (11) is longitudinally defined through the optical sleeve, for receiving an optical connector. The lens holder includes the cavity, a lens member (3), and a cylindrical protuberance (23) extending from a top surface of the lens holder. The protuberance is coupled into the fixing hole to ensure precise alignment of the optical connector, an optical axis of the lens member and the optical element. The optical sleeve is readily detachable from the lens holder. Therefore, when the optical connector needs to be changed to another kind of optical connector, the original optical sleeve can be replaced with a new suitable optical sleeve. The same lens holder can continue to be used.