Abstract: A titanium catalyst and a synthesizing method of polyester resins are provided in the present disclosure. The titanium catalyst has a chemical structure represented by Formula (I), Formula (II) or Formula (III). The symbols shown in the Formula (I), the Formula (II) or the Formula (III) are defined in the description. The synthesizing method of polyester resins includes providing the titanium catalyst, performing a feeding step, performing a heating and pressurizing step and performing a heating and vacuuming step. The titanium catalyst and a heat stabilizer are added into an autoclave before the feeding step or before the heating and vacuuming step.

Abstract: A light source fixing assembly includes an optical engine housing, a circuit board, a light emitting element, a flexible circuit board, a fixing element and an abutting element. The circuit board has a bearing surface, a first fixing region and a first conductive bonding region. The first bonding region and the light emitting element are on the bearing surface. The flexible circuit board is between the optical engine housing and the circuit board. The flexible circuit board has a first surface, a second surface opposite to the first surface, and a second fixing region. The second surface has a second bonding region. The fixing element fixes the circuit board and the flexible circuit board onto the optical engine housing. The abutting element abuts against the flexible circuit board and corresponds to the second bonding region, so that the first bonding region is electrically connected to the second bonding region.

Abstract: A titanium catalyst and a synthesizing method of polyester resins are provided in the present disclosure. The titanium catalyst has a chemical structure represented by Formula (I), Formula (II) or Formula (III). The symbols shown in the Formula (I), the Formula (II) or the Formula (III) are defined in the description. The synthesizing method of polyester resins includes providing the titanium catalyst, performing a feeding step, performing a heating and pressurizing step and performing a heating and vacuuming step. The titanium catalyst and a heat stabilizer are added into an autoclave before the feeding step or before the heating and vacuuming step.