Abstract: An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film, wherein in the ultraviolet band, the difference of between the wavelength with the transmittance at 80% of the absorbing film and the wavelength with the reflectivity at 80% of the first multilayer film falls in the range between 25 nm and 37 nm, the difference of between the wavelength with the transmittance at 50% of the absorbing film and the wavelength with the reflectivity at 50% of the first multilayer film falls in the range between 6 nm and 14 nm, and the difference of between the wavelength with the transmittance at 20% of the absorbing film and the wavelength with the reflectivity at 20% of the first multilayer film falls in the range between ?6 nm and 2.5 nm.

Abstract: The wall fastener for a wireless transmission module includes a supporting frame and a case. The supporting frame has a front face, a rear face, a first engagement portion and a slot. The case has a rear plate which has an outer face, an inner face, a second engagement portion and a stopper. The stopper partially projects out of the outer face. The first and second engagement portions mate and the stopper is received by the slot. The wireless transmission module and the supporting frame are tightly engaged and easily disengaged by a tool.

Abstract: A fixing structure for a metal unit and a plastic unit includes a metal unit, a metal engagement portion, a plastic unit and a plastic engagement portion. The metal unit has a metal main body and a base body formed on one side of the metal main body. The metal engagement portion is a metal body fixed by welding to the base body of the metal unit. The plastic unit has a plastic main body. The plastic engagement portion is integrally formed as one piece on the plastic main body. The plastic unit is accommodated in the metal main body of the metal unit, and the metal engagement portion and the plastic engagement portion are mutually engaged. Aesthetics is increased and thermal cycle tests can be passed.

Abstract: The wall fastener for a wireless transmission module includes a supporting frame and a case. The supporting frame has a front face, a rear face, a first engagement portion and a slot. The case has a rear plate which has an outer face, an inner face, a second engagement portion and a stopper. The stopper partially projects out of the outer face. The first and second engagement portions mate and the stopper is received by the slot. The wireless transmission module and the supporting frame are tightly engaged and easily disengaged by a tool.