JPH11297009A5 - - Google Patents

Description

The stator substrate 22 on which the spindle motor 15 is supported has screw insertion holes 25, 25, 25 formed at positions corresponding to the three support posts 23a, 23b, 23c (see Figure 5), and of these screw insertion holes 25, 25, 25, the screw insertion hole (hereinafter referred to as the "reference screw insertion hole") 25b corresponding to the support post 23b erected on the right edge of the pickup opening 21a is positioned with high precision using the spindle shaft 24 of the spindle motor 15 as a reference.

In this state, the reference screw insertion hole 25b is aligned with the screw hole of the support post 23b erected on the right edge of the pickup opening 21a , so the position of the support post 23b is accurately positioned in relation to the spindle shaft 24. As a result, the support post 23b functions as a positioning member that serves as a reference for the mounting positions, dimensions, etc. of each part and component on the chassis 13, and therefore will hereinafter be referred to as the reference support post 23b.

A motor support plate 42 supporting the sled motor 19 is fixed to the underside of the chassis 13 via three support columns 43, 43, 43, and the sled motor 19 is positioned in the sled motor opening 21c . A drive gear portion 44 is formed on the outer periphery of the rotor 19a of the sled motor 19, extending over approximately half of the circumference (see FIG. 13).

A pressing piece 55 is integrally formed on the opening edge 53a facing the front right of the mounting piece 53, extending diagonally downward, and a positioning piece 54 is integrally formed on the opening edge 53b facing the front left, bending downward and protruding (see Figures 19 and 20). The positioning piece 54 is formed with high positional accuracy relative to the spindle shaft 24, and the left edge 54a of the positioning piece 54 is particularly formed with high positional accuracy.