| 摘要 |
PURPOSE:To give effect to mass-production and cost reduction by specifying the constitution of a main record disk body. CONSTITUTION:Center part 3a provided with spiral sound groove 3b, difference 3c in level nearly concentric with sound groove 3b, and ring circumference part 3d are made of resin, etc., in one to form main record disk body 3. Then, printed matter 4 such as a lable is stuck to the top and reverse surfaces of circumference part 3d. As a result, a stationary record disk consists of two parts, main body 3 and printed matter 4, and its mass-production and reduction in cost are realized. Further, a player and sound groove 3b can be positioned with accuracy by matching difference 3c in level with the outside diameter of the stationary record player. |
