JPH0171311U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a plan view of the optical card showing an enlarged view of the state of light irradiation on the optical card, Figure 2 is a perspective view showing the optical system of the optical head, and Figure 3 is an electrical circuit diagram showing an example of the circuit configuration of the defect determination section. 4 is a time chart of the circuit shown in FIG. 3, FIG. 5 is a circuit block diagram showing another embodiment of the defect determination section, FIG. 6 is a time chart of the circuit shown in FIG. 5, and FIG. 7 is a circuit diagram of the circuit shown in FIG. 8 is an enlarged plan view of an optical card showing how light is irradiated onto the optical card according to another embodiment of this invention, and FIG. 9 is an enlarged plan view showing the information recording section of a conventional optical card. It is a diagram. _A1 ...First optical system, _A2 ...Second optical system, 1...Optical card, 3, 3a, 3b...Information recording track, 14...Light receiving section, 15...Defect determination section .

Claims (1)

[Scope of Claim for Utility Model Registration] A first optical system for writing information by irradiating light onto an information recording track of an optical card to be recorded, and a first optical system for irradiating light onto an information recording track of an optical card to be reproduced. In an optical card recording/reproducing device, the second optical system is capable of individually and simultaneously taking in reflected lights from a plurality of information recording tracks. A light receiving section is provided, and the light receiving section includes:
When recording information on a certain information recording track,
An optical card recording and reproducing device connected to a defect determining section for determining whether or not there is a defect in a subsequent information recording track based on a light reception signal from a light receiving section. The optical card recording and reproducing apparatus according to claim 1, wherein the first optical system uses a laser diode as a light source. The second optical system uses a light emitting diode as a light source for irradiating a single spot light onto a plurality of information recording tracks, and a light receiving section for individually receiving reflected light from each information recording track. The optical card recording and reproducing device according to claim 1, which is comprised of a plurality of photodiodes. The second optical system uses a laser diode as a light source for simultaneously irradiating individual spot lights onto a plurality of information recording tracks, and the light receiving section receives reflected light from each information recording track individually. The optical card recording and reproducing device according to claim 1, which is comprised of a plurality of photodiodes. The second optical system uses a light emitting diode as a light source for irradiating a single spot light onto a plurality of information recording tracks, and a light receiving section for individually receiving reflected light from each information recording track. The optical card recording and reproducing device according to claim 1, which is constituted by a CCD having a plurality of pixels. The defect determination section includes an analog comparator that generates a defect detection signal by comparing the signal level of the electrical signal obtained by photoelectric conversion in the light receiving section with a reference level;
A utility model registration request that includes a counter that measures the pulse width of the defect detection signal output by this analog comparator, and a digital comparator that compares the measured value by this counter with a discrimination reference value and outputs a discrimination result. The optical card recording/reproducing device according to scope 1.