Abstract: A light source apparatus include a light guide plate, a plurality of optical sheets and a frame, wherein one of the optical sheets is a prism sheet having a plurality of prisms on one surface and one or more integrally formed dark part suppressing projecting pieces engaging the frame. A pair of dark part suppressing sides adjoin the dark part suppressing projecting piece and form a first angle equal to or smaller than a dark part suppressing angle. Second angles making a pair of angles formed with a straight line and each of dark part suppressing sides are equal to or smaller than half of the dark part suppressing angle. The straight line passes through a region formed between the pair of dark part suppressing sides, passes through an intersection point of the pair of dark part suppressing sides and is parallel or perpendicular to ridge lines of the prisms.

Abstract: Disclosed is a light source apparatus including a light guide plate, a plurality of optical sheets and a frame, wherein one of the plurality of optical sheets is a prism sheet, the prism sheet having (i) a plurality of prisms formed on one surface thereof and (ii) one or more projecting pieces which are integrally formed with the prism sheet, the one or more projecting pieces engage to the frame, at least one of the one or more projecting pieces is a dark part suppressing projecting piece, sides making a pair of sides adjoining the dark part suppressing projecting piece are dark part suppressing sides, a first angle formed by the pair of dark part suppressing sides is equal to or smaller than a dark part suppressing angle, and second angles making a pair of angles formed with a straight line and each of sides making a pair of dark part suppressing sides are equal to or smaller than half of the dark part suppressing angle, the straight line (i) passing through a region formed between the pair of dark part supp

Abstract: A portable receiver includes an antenna to which at least FM broadcast wave is inputted, a matching circuit to which the signal input to the antenna is supplied via minute resistance component, an FM receiver unit with the output of the matching circuit connected thereto, and an earphone connected to the output of the FM receiver unit. The antenna is formed from rigid metal, and its length is shorter than the quarter wavelength of the FM broadcast wave. The matching circuit is formed by reactance element having fine DC resistance. The impedance value of the resistance component as viewed via the resistance component from the matching circuit is nearly equal to the impedance of the matching circuit.

Abstract: A portable receiver includes an antenna to which at least FM broadcast wave is inputted, a matching circuit to which the signal input to the antenna is supplied via minute resistance component, an FM receiver unit with the output of the matching circuit connected thereto, and an earphone connected to the output of the FM receiver unit. The antenna is formed from rigid metal, and its length is shorter than the quarter wavelength of the FM broadcast wave. The matching circuit is formed by reactance element having fine DC resistance. The impedance value of the resistance component as viewed via the resistance component from the matching circuit is nearly equal to the impedance of the matching circuit.