JPH0249556Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention This invention enables continuous measurement without changing the orientation of each laser diode when measuring the radiation characteristics of multiple laser diodes. The present invention relates to a measuring device.

(b) Prior Art and Problems The light emitted from a laser diode spreads to the front and back of the laser diode 1 as shown in FIG. Normally, only the forward light emission is used, but when the intensity of the laser diode 1 is measured on the X-axis and the Y-axis, the results are shown in FIGS. 3 and 4, respectively.

The width of 1/2 the intensity in Fig. 3 is the horizontal spread angle Θh,
The width of the 1/2 intensity point in FIG. 4 is called the vertical spread angle Θv, and is one of the important factors that indicate the characteristics of a laser diode.

A typical example is horizontal spread angle Θh=
10°, and the vertical spread angle Θv = 30°.

Next, FIG. 5 shows an external view of a conventional laser diode radiation characteristic measuring device.

In FIG. 5, 2 is a sensor, 3 is an arm, and 4 is a drive mechanism.

To make the explanation easier to understand, a perspective view is used in Figure 5, and the laser diode 1 appears to be floating, but the laser diode 1 in Figure 5
is placed on a stand (not shown).

The sensor 2 detects the radiation output of the laser diode 1, and is attached to the arm 3.

The drive mechanism 4 rotates the arm 3 so that the sensor 2 rotates around the light emitting point of the laser diode 1. The drive mechanism 4 uses a motor or the like.

Therefore, the direction of the laser diode 1 in FIG. 5 is set so that the light emission from the laser diode 1 is on the X axis in FIG. 2 with respect to the sensor 2, and in this state, while rotating the arm 3, If the output is recorded, data like the one shown in Figure 3 can be obtained.

Next, change the direction of the laser diode 1 in FIG. 5 by 90 degrees so that the light emission from the laser diode 1 is on the Y axis in FIG. If you record the output of , you will get data like the one shown in Figure 4.

In this way, when using the measuring device shown in FIG. 5, after rotating the arm 3 and measuring one divergence angle Θ shown in FIG. Rotate arm 3 and measure another divergence angle Θ.

Note that if the laser diode 1 is fixed and FIG. 5 is a state diagram in which the divergence angle Θ on the X axis is measured, the sensor 2 in FIG. A method may also be used in which the orientation of the arm 3 and the drive mechanism 4 is changed by 90 degrees and the next spread angle Θ on the Y axis is measured.

If the number of laser diodes is small, a measuring device like the one shown in Figure 5 can also be used.
When measuring a large number of laser diodes in a mass production factory, etc., the following problems arise.

In other words, first rotate arm 3 to measure one divergence angle Θ, then change the direction of the laser diode.
90°, then rotate arm 3 and measure another divergence angle Θ. This completes the measurement of the radiation angle of one laser diode. In order to measure a large number of laser diodes, such operations must be repeated, but the problem is that the orientation of the laser diodes must be changed each time, which is time-consuming.

(c) Purpose of the invention This invention is a method to continuously measure the radiation characteristics on the X-axis and Y-axis without changing the direction of the laser diode or the rotation direction of the sensor when measuring the radiation characteristics of a large number of laser diodes. The purpose is to provide measuring equipment that can perform measurements.

(d) Example of the invention A configuration diagram of an example of this invention is shown in Fig. 1.

11 to 17 in FIG. 1 are laser diodes, 21
and 22 are sensors, 31 and 32 are arms, 41 and 4
2 is a drive mechanism, 5 is an arm mount, and 6 is a component mount.

Sensor 21 and sensor 22 in FIG. 1 are the same as sensor 2 in FIG. 5, and arms 31 and 32 in FIG. 1 are also the same as arm 3 in FIG. 5.

Further, the drive mechanism 41 and drive mechanism 42 in FIG. 1 are also the same as the drive mechanism 4 in FIG. 5.

That is, in FIG. 1, there are two sets of measurement mechanisms that are the same as the sensor 2, arm 3, and drive mechanism 4 in FIG. .

A sensor 21 is attached to the arm 31, and a sensor 22 is attached to the arm 32.

The sensors 21 and 22 are shown in dotted lines in FIG. 1 because they are mounted facing the laser diodes 15 and 16, respectively.

Arm 31 and arm 32 are rotated by drive mechanism 41 and drive mechanism 42, respectively, in the same manner as in FIG. 5.

The laser diodes 11 to 17 are arranged on the component mounting base 6 at an interval between the sensors 21 and 22.

FIG. 1 shows a state in which the sensor 21 is placed above the laser diode 15 and the sensor 22 is placed above the laser diode 16. Therefore,
In FIG. 1, laser diode 15 and laser diode 16 are hidden by arms 31 and 32.

In FIG. 1, the component mounting base 6 is moved so that the laser diodes 11 to 17 are located below the sensor 21 and the sensor 22. After measuring the radiation characteristics of the laser diodes 11 to 17 in this state, the component mounting base 6 is moved to the position of the next laser diode.

Note that the component mounting base 6 may be fixed and the arm mounting base 5 may be moved. That is, the arm mount 5 and the component mount 6 only need to be able to move relative to each other.

In FIG. 1, the arms 31 and 32 are arranged at right angles, so when the sensor 21 measures the divergence angle Θh on the X-axis, the sensor 22 measures the divergence angle Θv on the Y-axis. It turns out. Therefore, in the sensor 22 of FIG.
After measurement 6 is completed, move the diode mount 6 in the direction of the arrow so that the laser diode 16 is under the sensor 21 and take the next measurement. It will be completed.

In Figure 5, laser diode 1 is connected to sensor 2.
The radiation angle of the laser diode 1 is measured by changing the direction of the arm 31.
Since the arms 32 and 32 are arranged at right angles, the direction is changed by the measuring mechanism.

Therefore, the component mounting base 6 is moved so that the laser diodes 11 to 17 are sequentially placed below the sensor 21 and the sensor 22 without changing the orientation of the laser diodes 11 to 17. and sensor 22 on the X axis or Y
If it is placed on the axis, the radiation angle of each laser diode can be measured continuously.

(e) Effects of the invention According to this invention, since two sets of measuring mechanisms arranged at right angles are used, the radiation characteristics of a large number of laser diodes can be measured without changing the orientation of the laser diodes. The radiation angle of the laser diode can be measured continuously.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an embodiment according to this invention, Figure 2
The figure shows the light emitting state of the laser diode.
4 and 4 are diagrams showing beam divergence angles, and FIG. 5 is a configuration diagram of a conventional radiation angle measuring device. 1...Laser diode, 2...Sensor, 3...
...Arm, 4...Drive mechanism, 5...Arm mount, 6...Component mount, 11-17...Laser diode, 21...Sensor, 22...Sensor, 3
1... Arm, 32... Arm, 41... Drive mechanism, 42... Drive mechanism.

Claims (1)

[Claims for Utility Model Registration] Radiation characteristics of a laser diode that has a sensor that detects the radiation output of the laser diode, an arm to which the sensor is attached, and a drive mechanism that rotates the arm around the light emitting point of the laser diode. The measuring device includes: a first measuring mechanism having the sensor, the arm and the driving mechanism; a second measuring mechanism having the sensor, the arm and the driving mechanism; an arm of the first measuring mechanism and a second measuring mechanism; an arm mount for attaching the arm of the measurement mechanism at a right angle; and a component mount for arranging a plurality of laser diodes at intervals between the sensors of the first measurement mechanism and the sensor of the second measurement mechanism, the arm; By moving the component mounting base with respect to the mounting base, the laser diode placed on the component mounting base is moved to the position of the sensor of the first measurement mechanism and the sensor of the second measurement mechanism, and the A laser diode radiation characteristic measuring device characterized in that after measuring the radiation characteristics of a laser diode, the next laser diode is moved to the position of each sensor.