Patent ID: 7534986

Claim:
An optical wireless transmission system for performing data communication by using light transmitted in free space, the optical wireless transmission system comprising: a transmission terminal having at least one light emission section operable to emit light; a reception terminal having at least one light reception section operable to receive light; and a terminal fixing auxiliary component for allowing the transmission terminal and the reception terminal to be mounted thereon, and fixing the at least one light emission section and the at least one light reception section so as to satisfy a predetermined positional relationship therebetween, wherein when the transmission terminal and the reception terminal are mounted on the terminal fixing auxiliary component, the at least one light emission section and the at least one light reception section are positioned such that light emitted by the at least one light emission section is prevented from being reflected by the at least one light reception section in a direction of the at least one light emission section, wherein a light emission section of the at least one light emission section and a light reception section of the at least one light reception section operate in conjunction with each other, and wherein in a case where the at least one light emission section and the at least one light reception section are positioned in parallel and facing each other by mounting the transmission terminal and the reception terminal on the terminal fixing auxiliary component, and L is a distance in a perpendicular direction between the light emission section and the light reception section operating in conjunction with each other, W is a distance in a parallel direction between the light emission section and the light reception section operating in conjunction with each other, θ is a directivity angle of light emitted by the light emission section operating in conjunction with the light reception section, and α is an illuminating angle of light emitted by the light emission section operating in conjunction with the light reception section with respect to the perpendicular direction between the transmission terminal and the reception terminal, α satisfies α>tan −1 (W/2L)+θ.