Abstract: A buckling device of a scanning head is installed at an initial position of an optic module of the scanner. A slot is formed on the casing of a scanner for being positioned and inserted by a swingable piece. Two lateral surfaces of the swingable piece are pivotally installed to a pair of shaft grooves on the casing by respective projecting shafts. The swingable piece has an upper stopper for being inserted into an engaging hole of the optic module. The swingable piece is installed with a lower stopper and a sliding groove is installed on the casing. A gate is installed in the sliding groove. A hooking piece protrudes from one end of the sliding groove for hooking one end of the spring at one side of the gate; another end of the spring is connected to a hook portion at an end surface of the sliding rod passing through another end of the gate. A transverse piece and a straight piece are installed on the sliding rod. The straight piece is buckled to a resisting surface at a bottom of the optic module.

Abstract: The present invention provides a ring-opened polymer, which is prepared by reacting at least one pericyclic olefin elected from those represented by formulae (I) and (II) through ring-opening metathesis polymerization wherein A and B may be the same or different and are independently selected from the group consisting of halogen, hydrogen, C3-20 cyclic or pericyclic alkyl, C1-20 linear and branched alkyl, C6-20 aryl, C7-20 arylalkyl, C7-20 alkylaryl, silyl, alkylsilyl, germyl, alkylgermyl, alkoxycarbonyl, acyl, and a heterocylic group; or, A and B are linked together to form a C3-20 saturated or unsaturated cyclic hydrocarbon group or a substituted or unsubstituted heterocyclic group; C is selected from the group consisting of oxygen, sulfur,  —CH2—, and —SiH2—, wherein each R1 is independently selected from C1-20 alkyl and phenyl; each R is independently selected from hydrogen, halogen, and C1-20 alkyl; and each n is an integer from 1 to 6