JPH04221438A - Jig for measuring laser power of optical disk device - Google Patents

Abstract

PURPOSE:To enable measurement to be made with an improved working efficiency and accurately by the use of a measuring jig for laser power of an optical disk device. CONSTITUTION:The body of a jig 21 has virtually the same shape as that of a cartridge where an optical disk is housed. A surface 30a of a photoelectric conversion element 30 within the body 21 of the jig is slanted for a center line 46 of a laser 9. a laser 92 which is reflected on the surface 30a advances in a deflected direction for an optical heat 6 and does not return to the optical head 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for measuring the power of a laser emitted from an optical head of an optical disk device.

[0002] In an optical disc device, the power of the laser emitted from the optical head affects the S/N ratio of recording and reproduction of the optical disc. This is one of the important management items for later maintenance. Based on the laser power measurement results, various adjustments are made as necessary.

[0003] Before the laser emitted from the laser diode exits from the objective lens of the optical head, the laser passes through a plurality of optical elements and is attenuated in various ways.

[0004] Therefore, in order to obtain measurement results for proper adjustment, measurements are made at the position of the surface of the optical disc loaded in the optical disc device, and all errors, attenuation, etc. in the optical system of the optical head are included. It is necessary to measure the laser power.

[0005] Also, when considering actual measurement,
It is desirable to be able to perform measurements efficiently.

Furthermore, it is necessary that the measurement accuracy be good.

[0007]

2. Description of the Related Art Conventionally, measurements have been made using a commercially available sensor 1, as shown in FIG. In the measurement, first, the exterior cover 3 of the optical disk device 2 is removed, and then the upper printed wiring board assembly 4 is removed to expose the inside of the device 2.

In this state, the sensor 1 connected to the power meter 5 is held in the hand and placed above the objective lens 7 of the optical head 6 as shown in FIG. 9 for measurement.

[0009]

[Problems to be Solved by the Invention] As described above, it takes time and effort to prepare for measurement, and it is difficult to perform measurement efficiently.

Furthermore, since the sensor 1 is held in the hand for positioning, the positioning during measurement is unstable, the measurement accuracy is poor, and the reliability of the measurement results is low.

Further, as shown in FIG. 10, the laser diode 8 emits light upward, and the objective lens 7 of the optical head 6
A part 91 of the laser 9 that has been emitted and irradiated the sensor 1
is reflected by the sensor 1, returns to the optical head 6, enters the optical head 6, returns to the laser diode 8, and further passes through the laser diode 8 to reach the monitor section 10.

Therefore, the monitor unit 10 is irradiated with the laser 91 reflected by the sensor 1 in addition to the laser 11 emitted downward from the laser diode 8, making it impossible to correctly monitor the operation of the laser diode 8 itself. It disappears.

[0013] If the monitor unit 10 does not monitor correctly, the operating state of the laser diode 8 will be different from that during actual recording and reproduction of the optical disc, and the measurement results by the sensor 1 and power meter 5 described above may be unreliable. It was a low value.

SUMMARY OF THE INVENTION An object of the present invention is to provide a jig for measuring the laser power of an optical disk device, which makes it possible to measure the power of a laser emitted from an optical head with high efficiency and accuracy.

[0015]

[Means for Solving the Problems] The invention as claimed in claim 1 provides a jig body having the same shape as a cartridge containing an optical disk, a photoelectric conversion element being provided in the jig body, and a surface of the photoelectric conversion element being exposed to a laser beam. It is constructed by arranging it at an angle with respect to a plane perpendicular to the center line.

According to the second aspect of the invention, the jig main body has the same shape as the cartridge containing the optical disk, the photoelectric conversion element is provided in the jig main body, and the surface of the glass cover on the surface of the photoelectric conversion element is covered with a laser beam. It is constructed by arranging it at an angle with respect to a plane perpendicular to the center line.

[0017]

In the first and second aspects of the invention, the jig main body has the same shape as the cartridge, so that the jig can be installed into the optical disc device in the same way as the cartridge.

In the first and second aspects of the invention, the photoelectric conversion element is arranged with respect to the laser so that the reflected laser faces in a direction different from that of the optical head, thereby preventing the reflected laser from returning into the optical head.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show a laser power measuring jig 20 according to a first embodiment of the present invention.

Reference numeral 21 denotes a jig main body, which has substantially the same shape and dimensions as the optical disk cartridge installed in the apparatus 2 shown in FIGS. 1 and 6. For this reason, the measurement jig 2
0 is the optical disc device 2 as well as the optical disc cartridge.
It can be installed on.

The jig main body 21 has a shutter 23 that is the same as the shutter attached to the optical disc cartridge.

Note that when the shutter 23 shown in FIG. 4 is open, in the case of an optical disk cartridge, the approximately rectangular opening 14 shown by the two-dot chain line is exposed, whereas in the jig main body 21, the turn is exposed. An opening 25 for the table and an opening 26 for introducing the laser beam are formed.

This laser beam introduction opening 26 is located at a portion P1 facing the objective lens of the optical head located at the standby position when the jig 20 is mounted, specifically near the front edge of the jig body 11. It is formed at the site of a(=10
It has a small size of mm)×b (=20 mm).

The inside of the jig main body 21 has a structure shown in FIG. In FIG. 1, 30 is a disk-shaped photoelectric conversion element, which is connected to the top plate 31 of the jig main body 21 via a support 34 on the surface.
It is fixed to a portion of the lower surface of the laser beam that faces the laser beam introduction opening/closing opening 26.

The wire 32 from the photoelectric conversion element 30 is pulled out to the outside of the jig main body 21, and is connected to a power meter 33.
It is connected to.

The support 34 has a triangular cross section, and the surface 30a of the photoelectric conversion element 30 is inclined with respect to the top plate 31.

Next, a method of measuring the laser power emitted from the optical head 6 of the optical disc device 2 using the laser power measuring jig 20 having the above structure will be described. The measurement was carried out without disassembling the optical disk device 2.
As shown in FIG.
The device is inserted through the insertion port 42 of No. 1, and is stably attached as shown in FIG.

Thereby, the power of the laser emitted from the optical head 6 can be measured with good workability.

The jig 20 has an opening 26 as shown in FIG.
is mounted facing the objective lens 7 of the optical head 6, and the photoelectric conversion element 30 optically faces the objective lens 7.

The laser 44 emitted from the laser diode 8 in the optical head 6 is transmitted through a plurality of optical elements (not shown).
After passing through the objective lens 7, the light is emitted from the optical head 6 as a laser beam 9 in the form of a focused beam. The laser 9 emitted from the optical head 6 enters the jig 20 through the opening 26. The laser 9 is once focused, and then becomes a divergent bundle of light rays and irradiates the photoelectric conversion element 30 as a spot 45.

When the photoelectric conversion element 30 is irradiated, it outputs a current. This current is supplied via a wire 32 to a power meter 33 installed outside the optical disc device 2.

The laser power emitted from the optical head 6 can be measured from the value displayed on the power meter 33.

[0033] After the measurement is completed, perform an eject operation. Thereby, the jig 20 is removed from the optical disc device 2.

As can be seen from the above, it is only necessary to handle the jig 20 in the same way as an ordinary optical disc case, and there is no need to partially disassemble the optical disc device 2. Therefore, it is possible to measure the power of the laser emitted from the optical head. is carried out with good workability.

Referring to FIG. 6, the surface 30a of the photoelectric conversion element 30 is also inclined at an angle θ with respect to a plane 47 perpendicular to the center line 46 of the laser 9. As shown in FIG.

For this reason, the photoelectric conversion element 3 of the laser 9
The laser beam 92 reflected from the surface 30a of the laser beam 92 is directed in a direction at an angle 2θ with respect to the center line 46, that is, in a direction deviated from the optical head 6, but not toward the optical head 6.
It does not fit into the optical head 6.

Therefore, the monitor section 10 receives only the laser beam 11 emitted from the laser diode 8, and correctly monitors the operation of the laser diode 8. As a result, the laser diode 8 operates normally as in the case of actual optical disc recording and reproduction.

[0038] Thereby, the power of the laser emitted from the optical head 6 is the same as that during recording and reproduction of the optical disc, and the laser power emitted from the optical head 6 can be measured accurately and reliably.

FIG. 7 shows a jig 50 for measuring laser power of an optical disk device, which is a second embodiment of the present invention.

This jig 50 attaches a photoelectric conversion element 51 to a photoelectric conversion element body 52 with a glass cover 53 on a surface 52a.
This photoelectric conversion element 51 is fixed to the lower surface of the top plate 31 of the jig main body 21.

The surface 53a of the cover 53 is inclined with respect to the top plate 31. With the jig 50 attached to the optical disc device 2, the laser 9 emitted from the optical head 6 is
Enter the jig 50 through the opening 26 and close the glass cover 53.
The photoelectric conversion element 52 is irradiated as a spot 54 through the light.

Referring to FIG. 8, the surface 53a of the glass cover 53 of the photoelectric conversion element 51 is inclined at an angle θ with respect to a plane 47 perpendicular to the center line 46 of the laser 9. As shown in FIG.

For this reason, the glass cover 5 of the laser 9
The laser beam 93 reflected from the surface 53a of
It heads in a direction at an angle 2θ with respect to the optical head 6, but does not head toward the optical head 6, but heads in a direction deviated from this, and does not enter the optical head 6.

Therefore, as in the above embodiment, the optical head 6 operates in the same manner as when recording and reproducing an optical disc.
The power of the laser emitted from the optical head 6 can be measured with good reliability.

[0045]

As explained above, according to the invention of claim 1, it is possible to easily measure the laser power of the optical head of an optical disc device, and the optical disc device actually records and plays back the optical disc. The laser power of the optical head can be measured with high reliability.

According to the invention of claim 2, it is possible to easily measure the laser power of the optical head of an optical disc device, and also to measure the laser power of the optical head when the optical disc device is actually recording and reproducing an optical disc. It has the advantage of being able to measure with high reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing how a first embodiment of a laser power measurement jig for an optical disk device according to the present invention is used (the internal structure of the jig is a cross section taken along line I-I in FIG. 2); .

FIG. 2 is a plan view of the jig shown in FIG. 2;

FIG. 3 is a bottom view of the jig in FIG. 1;

4 is a bottom view showing a state in which the shutter in FIG. 3 is open; FIG.

FIG. 5 is a diagram illustrating how to use the jig shown in FIGS. 1 to 3;

FIG. 6 is a diagram illustrating laser reflection when the jig shown in FIG. 1 is used.

FIG. 7 is a diagram showing a jig according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating laser reflection when the jig shown in FIG. 7 is used.

FIG. 9 is a diagram showing a conventional measuring jig and a method of using the same.

FIG. 10 is a diagram for explaining problems with a conventional measuring jig.

[Explanation of symbols]

2 Optical disk device 6 Optical head 7 Objective lens 8 Laser diode 9 Lasers 92, 93 Reflected laser 10 Monitor parts 20, 50 Laser power measurement jig 21 Jig body 26 Laser beam introduction openings 30, 35 Photoelectric conversion element 30a Surface 34 Support stand 41 Front bezel 45, 54 Spot 46 Center line 47 of laser 9 Vertical surface 52 Photoelectric conversion element main body 52a Surface 53 Glass cover 53a Cover surface

Claims (2)

[Claims] 1. A jig main body having substantially the same shape as a cartridge in which an optical disc is housed, and installed in an optical disc device like the cartridge; A jig for measuring laser power of an optical disc device, comprising a photoelectric conversion element provided at a portion optically facing an objective lens of an optical head in the optical disc device when installed in the optical disc device,
A jig for measuring laser power of an optical disc device, characterized in that the photoelectric conversion element is arranged such that its surface is inclined with respect to a plane perpendicular to a center line of a laser beam irradiating the surface. 2. A jig main body having substantially the same shape as a cartridge in which an optical disc is accommodated and installed in an optical disc device like the cartridge; A jig for measuring laser power of an optical disc device, comprising a photoelectric conversion element provided at a portion optically facing an objective lens of an optical head in the optical disc device when installed in the optical disc device,
The photoelectric conversion element has a structure in which a glass cover is provided on the surface of the photoelectric conversion element body, and the surface of the glass cover is perpendicular to the center line of the laser that irradiates the photoelectric conversion element. A jig for measuring laser power of an optical disc device, characterized in that the jig is arranged at an angle with respect to a surface.