JPS6445324U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a bottom view of a metal substrate, Figure 2 is an enlarged sectional view of the main part, and Figure 3 is a partially cutaway view. 4 to 6 show a conventional example, in which FIG. 4 is a partially cutaway front view, FIG. 5 is a bottom view of the metal substrate, and FIG. 6 is a front view of the metal substrate. FIG. 3 is an enlarged cross-sectional view of main parts. 4 is a metal substrate (substrate), 4a is the substrate body, 4b
8 is a protrusion, 8 is a frequency detection signal generation pattern,
9 is a pattern for generating a phase detection signal, 19 is a magnet for frequency and phase detection signals, 19a is a magnetized surface for frequency detection signals, and 19b is a magnetized surface for phase detection signals.

Claims (1)

[Scope of utility model registration request] A substrate having a substrate body, a protrusion protruding radially outward from the outer periphery of the substrate body and bent at a substantially right angle to the substrate body, and a frequency detection signal formed on the surface of the substrate body. A generation pattern, a phase detection signal generation pattern formed on the surface of the protrusion, and a frequency detection signal generation pattern arranged so as to be relatively rotatable facing the substrate body and the protrusion, and a frequency detection signal generation pattern formed on the surface facing the substrate body. 1. A direct-coupled motor for a rotary head drum, comprising a frequency and phase detection signal magnet, which is magnetized and a phase detection signal magnetic field is magnetized on a surface facing the protrusion.