JPH0217610U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of the magnetic rotary encoder according to this invention, Figures 2a and b are waveform diagrams of the magnetization signal of the one in Figure 1, and Figures 2c and d are the waveform diagrams of the one in Figure 1. Explanatory diagram of magnetic pattern, Figure 2 e
is an explanatory diagram of the magnetoresistive element shown in Fig. 1, Fig. 2 f is a waveform diagram of the output signal of Fig. 1, Fig. 3 is a perspective view showing an example of a conventional magnetic rotary encoder, and Fig. 4 a is a waveform diagram of the magnetization signal as in Figure 3, Figure 4b is an explanatory diagram of the magnetic pattern as in Figure 3, Figure 4c is an explanatory diagram of the magnetoresistive element as in Figure 3, and Figure 4d is an explanatory diagram of the magnetoresistive element as in Figure 3. FIG. 4 is a waveform diagram of the output signal of FIG. 3; 1, 11... Magnetic disk, 2, 12... Magnetic head, 3a, 3b, 13... Magnetic pattern, 4
a, 4b, 14... Magnetization signal, 5a, 5b, 15
a, 15b... Magnetoresistive element, 6, 16... Output signal.

Claims (1)

[Scope of utility model registration request] A pair of magnetoresistive elements provided in the magnetic head now detect magnetization signals generated as the magnetic disk rotates, on which a magnetic pattern with a predetermined magnetization pitch is formed along the circumferential direction. In the magnetic rotary encoder, two sets of the magnetic patterns are formed on the magnetic disk, separated from each other in the axial direction, and with magnetized pitches of both the magnetic patterns being shifted from each other along the circumferential direction, A magnetic rotary encoder characterized in that each magnetization signal generated from a magnetic pattern is combined and detected by the pair of magnetoresistive elements.