JPS6085727U - information reading device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional information reading device, Figure 2 is an operational explanatory diagram showing the relationship between the polarization planes of the incident light and reflected light on the recording medium in Figure 1, and Figure 3 and the following figures are respectively Embodiments of the information reading device of this invention are shown; FIG. 3 is a block diagram of one embodiment, FIG. 4 is a block diagram of another embodiment, and FIG. 5 is a block diagram of another embodiment.
The figure is a front view of a recording medium of still another embodiment. 1... Laser, 5... Magneto-optical recording medium, 8a. 8b...Photodetector, 9...Differential amplifier, 10...-Adder, 11...Connection section. Figure 2 Figure 3

Claims (1)

[Scope of utility model registration request] A semiconductor laser that irradiates a recording medium on which information is recorded with a laser beam, a detection unit that detects a reflected light beam from the medium and outputs a detection signal, and reproduces the information recorded on the medium using the received light signal. An information reading device comprising: a differential reproducing circuit for reproducing a magneto-optical recording medium which is reproduced based on the magnetic Kerr effect; and an optical recording medium which is optically reproduced. a non-differential reproducing circuit for reproduction, and a connection for selectively connecting the differential reproducing circuit and the non-differential reproducing circuit to the detection section depending on whether the medium is a magneto-optical recording medium. An information reading device composed of parts.