A solder alloy is a tin-silver-copper solder alloy containing tin, silver, copper, nickel, antimony, bismuth, and indium, and substantially does not contain germanium, wherein relative to the total amount of the solder alloy, the silver content is more than 0. In the storage mode, the receptacle can easily be carried in a pocket or purse until needed to receive undesirable material for disposal. In which an optical waveguide including a periodic structure is formed between the emission regions and the optical waveguide includes a surface which is opposite to the substrate and is more repellent to a light emitting material liquid for forming the emission layer than the emission region. The first and second components, respectively, are polarized lights having first and second polarization directions, which are perpendicular to each other. However, the increase of the drive braking torque is limited to a predefined amount when the wheel braking system is loaded less highly or the vehicle velocity changes. This pressure is supplied to one side of a double check valve, while the other side receives a delivery from the foot valve to assure delivery for normal service braking.