JPH05187798A - Method and apparatus for exploding with semiconductor laser - Google Patents

Abstract

PURPOSE:To prevent erroneous explosion due to electrostatic failure such as leakage current, lightning, etc. CONSTITUTION:A method for and an apparatus for exploding with a semiconductor laser comprise the steps of guiding a convergent light obtained by converging laser lights from a plurality of semiconductor lasers 6 through an optical fiber 13 and igniting an initiator 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for initiating a semiconductor laser and an apparatus therefor, and more particularly to a novel improvement for preventing erroneous explosion due to electrostatic damage such as leakage current and lightning.

[0002]

2. Description of the Related Art Conventionally, the most commonly used detonator such as a detonator energizes a thin resistance wire arranged inside, and its Joule heat ignites a detonator arranged around the resistance wire. It had a detonating structure and its structure was extremely simple.

[0003]

Since the conventional detonator is constructed as described above, there are the following problems. That is, since the resistance wire to the power supply section is electrically connected through the switch section,
When electrostatic damage such as leakage current or lightning occurs, the current flows into the resistance wire and immediately generates Joule heat.
I always had the risk of accidental explosion.

The present invention has been made to solve the above problems, and in particular, provides a semiconductor laser detonation method and apparatus for preventing accidental explosion due to electrostatic damage such as leakage current and lightning. The purpose is to

[0005]

In the method for initiating a semiconductor laser according to the present invention, converged light obtained by converging laser beams from a plurality of semiconductor lasers is guided to an initiator through an optical fiber and the initiator is ignited. It is a method to let.

A semiconductor laser detonator according to the present invention comprises a compound eye projector for converging laser light from a plurality of semiconductor lasers to form converged light, an optical fiber for carrying the converged light, and a tip of the optical fiber. A heat absorber provided to absorb the heat energy of the convergent light;
The initiator is arranged around the heat absorber, and the initiator is ignited by the heat generated in the heat absorber.

More specifically, the compound-eye floodlight includes a first holding plate provided on a shaft, and a second holding plate arranged coaxially with the shaft and parallel to the first holding plate. It is configured to include a plurality of rods that penetrate through the through holes formed in each of the holding plates and that are arranged non-parallel to the shaft, and a semiconductor laser provided at an end of each of the rods.

[0008]

In the method and apparatus for initiating a semiconductor laser according to the present invention, the converged light obtained by converging laser light from a plurality of semiconductor lasers propagates through the optical fiber,
The thermal energy is guided to the detonator, and the thermal agent ignites the detonator, so that erroneous explosion due to electrostatic damage can be avoided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a semiconductor laser detonation method and apparatus according to the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a reference numeral 10 indicates a power source section for supplying a current to the compound eye projector 11, and the power source section 10 and the compound eye projector 11 are connected via a switch section 12. There is. An optical fiber 13 for transmitting the converged light generated in the compound eye projector 11 to the outside is provided at the tip of the compound eye projector 11. A heat absorber 14 that absorbs the thermal energy of the convergent light and radiates heat by itself is provided at the tip of the optical fiber 13. Further, a known detonator 15 is arranged so as to be in contact with the heat absorber 14. The detonator 15 and the heat absorber 14 are housed in a case 16 to eliminate external interference.

The compound eye projector 1 shown enlarged in FIG.
1 has a first holding plate 1 provided in a vertical state, and a shaft 2 formed in a direction orthogonal to the first holding plate 1 is provided at a central position of the first holding plate 1. There is.

A cylindrical body 3 is provided on the outer periphery of the shaft 2 coaxially therewith, and a front end 3a of the cylindrical body 3 has a second holding plate formed in parallel with the first holding plate 1. The plate 4 is integrally formed. Each of the holding plates 1 and 4 is formed with through holes 1a and 4a having expanded portions 1aA and 4aA whose both ends are expanded in a trumpet shape, and these through holes 1a and 4a are formed.
A plurality of rods 5 are arranged between the holding plates 1 and 4 so as to be non-parallel to each other and non-parallel to the axis of the shaft 2, and each rod 5 can be operated between the through holes 1a and 4a. Held in.

A projecting small diameter portion 1aB, 4aB is formed at a central position in the axial direction of each through hole 1a, 4a, and each rod 5 is joined to and held by each small diameter portion 1aB, 4aB. At the same time, it is configured so that it can be tilted in accordance with the expanding portions 1aA and 4aA. At the end 5a of each rod 5, a semiconductor laser 6 which is connected to the power supply unit 10 and emits a laser beam by using this current is provided, and the optical axis 6a from each semiconductor laser 6 is: It is configured so that it converges at the end of the optical fiber 13 and coincides with the focal point 7.

The operation of the compound eye projector 11 described above will now be described. First, in the state of FIG.
Alternatively, the shaft 1 is moved in the axial direction. Due to this movement, the relative distance D between the holding plates 1 and 4 changes, and the tilt angle of each rod 5 changes via the expansion portions 1aA and 4aA in accordance with the change in the relative distance D. The angle of the optical axis 6a of the semiconductor laser 6 can be changed.

Therefore, when each optical axis 6a of each semiconductor laser 6 is made to coincide with the focal point 7, each optical axis 6a is changed by changing the relative distance D while each semiconductor laser 6 is operated. Can be visually confirmed, and the optical axis 6a can be adjusted extremely easily. In the above embodiment, the case where the holding plates 1 and 4 are manually moved relative to each other has been described. For example, a driving device (not shown) driven by a current from the power source unit 10 such as a motor is used. In the above description, the configuration is such that the second holding plate 4 is formed remotely, and the case where the second holding plate 4 is formed on the tubular body 3 has been described. However, without using the tubular body 3, only the second holding plate 4 is moved onto the shaft 2. The configuration may be freely provided.

The semiconductor laser detonation method by the semiconductor laser detonation device of the present invention will be described below. Case 1 containing heat absorber 14 and detonator 15 for blasting work
6 is first loaded into the explosive. Then, the power supply unit 10 and the compound-eye projector 11 are separated to an appropriate place to prepare for the blast.

In this state, when the switch section 12 is turned on, a current is supplied from the power source section 10 to the semiconductor laser 6,
Laser light is emitted from the tip of the semiconductor laser 6.
The laser light is converged at the end of the optical fiber 13, and the converged light is sent to the heat absorber 14 through the optical fiber 13. The heat energy of the convergent light that is constantly transmitted through the optical fiber 13 is absorbed by the heat absorber 14, and the temperature rises at this portion. At the moment when the temperature of the heat absorbing body 14 reaches the ignition temperature of the detonator 15, detonation occurs, and at the same time, blasting occurs and the blasting work is completed.

Since the compound-eye projector 11 of this embodiment is of the auto-focus type, the focus 7 of the semiconductor laser is not always aligned with the end of the optical fiber 13, and if necessary, for example, immediately before turning on the power. By adjusting to, it is possible to better prevent accidental explosion due to electrostatic damage.

Since the energy required for the initiation is about 2 joules, if a plurality of 1 watt semiconductor lasers are used to initiate the ignition in 0.1 seconds, about 20 semiconductor lasers are required, which is the present. It is very expensive at the stage, but if you decide to detonate in 1 second, the
Only about one piece is required, the price is only 1/10, and it can be economically versatile.

[0020]

Since the semiconductor laser detonation method and the apparatus therefor according to the present invention are configured as described above, the following effects can be obtained. That is, since the convergent light obtained by converging the laser beams from the plurality of semiconductor lasers is guided to the initiator through the optical fiber and the initiator is ignited, the device can be miniaturized due to the characteristics of the semiconductor laser. Moreover, it is possible to prevent erroneous explosion due to electrostatic current damage such as leakage current and lightning, and to enable safe ignition.

[Brief description of drawings]

FIG. 1 is a schematic view showing a semiconductor laser detonator of the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of a compound eye projector.

[Explanation of symbols]

 6 semiconductor laser 11 compound eye projector 13 optical fiber 14 heat absorber 15 detonator

Claims (3)

[Claims] 1. Converged light obtained by converging laser light from a plurality of semiconductor lasers (6) is used for an optical fiber (1).
3) to the initiator (15), and the initiator (1
5) A method for initiating a semiconductor laser, which comprises igniting 2. A compound eye projector (11) for converging laser light from a plurality of semiconductor lasers (6) to form convergent light.
And an optical fiber (1
3) and a heat absorber (1) provided at the tip of the optical fiber (13) for absorbing the heat energy of the convergent light.
4) and a detonator (15) arranged around the heat absorber (14), and the detonator (15) is ignited by the heat generated in the heat absorber (14). Laser detonator. 3. The compound eye projector (11) comprises: a first holding plate (1) provided on a shaft (2); and a first holding plate (1) arranged coaxially with the shaft (2). The second holding plate (4) arranged in parallel and the through holes (1a, 4a) formed in the respective holding plates (1, 4) are penetrated and arranged non-parallel to the shaft (2). 3. A semiconductor laser detonator as claimed in claim 2, characterized in that it comprises a plurality of rods (5) formed and a semiconductor laser (6) provided at the end of each rod (5).