JPS5817977B2 - Hikari Yomitori Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Some types of information reproducing apparatuses that handle video information have an information recording disk as shown in FIG.

This information recording disk 1 will be explained based on the partial cross-sectional view of FIG. 3...
is further formed.

Since the deformed portions 3, 3, .

The present invention relates to a reading device that optically reads the deformed portion in the groove, and is an optical reading device that is capable of sufficiently extracting even weak reflected light from the deformed portion as an output, and has a simple structure and low loss. The main purpose is to provide equipment.

Other objects, advantages and features of the present invention will become apparent from the following description.

Hereinafter, the present invention will be explained in detail using Examples.

FIG. 2 is a perspective view of an optical reading device according to the present invention, which is equipped with a mechanism for irradiating the spiral groove 2 of the recording disc 1 shown in FIG. 1 and detecting the reflected light. FIG. 3 is a side cross-sectional view of the illustrated device;

Next, the same parts in FIG. 2 and FIG. A light-emitting element 23 such as a small-area light-emitting diode having a P-N junction and a light-receiving element 24 such as a photodiode are formed by diffusion on this substrate 22 using integrated circuit technology. Insulating layer 25 on top of it
The light guides 26 and 27 are provided through the light guides 2 and 27.
6 and 27, the light emitting element 23, and the light receiving element 24 are coupled by wedge coupling 28 or lattice coupling.

In this case, the light guides 26 and 27 may be formed of a transparent material such as quartz or glass by a known thin film technique such as vapor deposition or etching.

The needle electrode 21 configured in this way is attached to the arm 29 with an adhesive 30, and the needle electrode 21 is used for supplying voltage to the light emitting and light receiving elements 23 and 24 and for deriving signals. A lead wire 31 is provided.

In this way, in order to detect information in the grooves 2 provided on the recording disc 1, an optical reading device irradiates the grooves 2 with light and electrically converts and reads the reflected light in the grooves 2 of the irradiated light. Since each component is integrally integrated on the substrate, mass productivity and reliability are dramatically improved, needle electrodes can be easily replaced, and light loss is reduced.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an information recording disc, FIG. 2 is a perspective view of an optical reading device according to the present invention, and FIG. 3 is a side sectional view of the device shown in FIG. 21: needle electrode, 22: substrate, 23: light emitting element, 24: light receiving element, 25: edge layer, 26, 27: light guide, 29:
Arm, 31: Lead wire.

Claims (1)

[Claims] 1. A substrate is provided on the needle electrode, a light emitting element and a light receiving element are formed on this substrate using integrated circuit technology, and a first light guide body guides light from the light emitting element to an information recording section on a recording medium. a second guiding light reflected from the information recording section to a light receiving element;
and a light guide body provided on the substrate, and a means for supplying a power voltage to the light emitting element and the light receiving element, and a signal detecting means for the light receiving element and the light receiving element are connected to each other via a lead wire.