JPH09250926A - Laser device for horizontal marking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser device with which the laser beam is, as horizontal continuous laser projection line of high precision, definitely displayed on a surrounding wall surface, etc. SOLUTION: On a horizontal supporting body 2 supported to/fixed with a pillar 14, an adjustment plate 36 which is supported while free oscillation in both orthogonal and horizontal axes directions is allowed is provided. In addition, on the adjustment plate 36, a laser projection device 39 wherein the laser beam projected in horizontal direction is diffused with a vertical rod lens 38 wherein a center passes through an optical axis so that laser projection line is formed, and two single axis horizontal sensors 40, which effectively adjust/control horizontality in two axis directions, wherein the bubble position is outputted as analogue signal by an electric detection means, and a control motor 25 is driven/controlled with it, are provided. Here, the diffused laser beam from the laser projection device 39 is projected through a horizontal slit SL of a cover cap B, and displayed on an outer periphery wall surface, etc., as horizontal and continuous laser projection line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal marking laser device used for marking in a room layout or partitioning.

[0002]

2. Description of the Related Art In a conventional horizontal marking laser device of this type, a laser irradiating device itself or a supporting body supporting the laser irradiating device can be freely swung in a vertical plane by a gyro means. The rod lens is pivotally supported on the optical axis of the irradiated laser beam and the reflected optical axis or on the optical axis with its central axis being horizontal and vertical, and the beam emitted through the rod lens to the vertical plane is directly or The structure is basically based on the structure in which the slits for radiating light rays of the cover body are radiated to the outside, and those disclosed in Japanese Utility Model Laid-Open No. 3-88678 or Japanese Patent Laid-Open No. 6-297350 are known. .

[0003]

Problems to be Solved by the Invention
The ink-marking laser device described in Japanese Patent No. 2943 supports a laser tube (a helium gas laser type 1 mmW straight deflection type installed in a cylindrical protection tube made of aluminum) so as to be automatically vertical by a gyro. The laser tube is placed inside the windshield suspended from the head, and the windshield is equipped with a plurality of screw-in type fixtures for fixing the protective tube of the laser tube. Although it can be prevented, the work is very troublesome because the plurality of fixtures must be rotated separately from the power connection.

Further, in the marking-out device described in Japanese Patent Laid-Open No. 6-297350, since the support body pivotally supported like a weight supporting the laser irradiation device is in a free state, the device can be transported and delivered to the site. The laser irradiation device collides with the inner wall of the cover or the columns during transporting or when moving from place to place on the site, causing damage to them or damage to the pivots, which causes a deviation in the projection of the vertical or horizontal marking line. There were challenges.

According to the present invention, a highly accurate horizontality is automatically set only by setting a laser irradiation direction to a desired wall surface direction at a predetermined position, and a laser beam from a laser irradiation device adjusted and fixed to a horizontal support is An object of the present invention is to provide a horizontal marking-out laser device capable of clearly displaying at a predetermined position such as an inner peripheral wall of a room as a highly precise and accurate horizontal continuous laser irradiation line.

[0006]

According to the laser device for marking out in the horizontal direction of the present invention, a horizontal support member is fixed to a supporting column standing on a base of a main body, and a support shaft standingly fixed on the horizontal supporting member is attached to the support shaft. An adjusting plate swingable in at least two orthogonal horizontal axis directions is connected to the horizontal support, and rotations of a plurality of control motors mounted on the horizontal support at positions corresponding to the swinging direction of the adjusting plates. In the apparatus main body equipped with means for controlling the swing of the adjusting plate, a laser beam emitted in a direction parallel to one axis of the two orthogonal horizontal two axes is vertically moved by a vertical rod lens whose center passes through the optical axis. A laser irradiation device that diffuses to form a laser irradiation line, and a plurality of angle information signals detected by electrical detection means corresponding to the position of a bubble are output as analog signals. It consists of two horizontal sensors or a two-axis horizontal sensor, and the laser irradiation device and two single-axis horizontal sensors or two-axis horizontal sensors are fixed on the adjusting plate of the main body of the device by aligning them in the orthogonal horizontal two-axis direction. The control motor is driven so that the analog signal from any one of the horizontality detecting devices becomes zero.

As means for transmitting control motion to the adjusting plate by a control motor, horizontal pins orthogonal to the respective axis lines can swing freely at two positions on the same radial line of the adjusting plate which coincide with the two orthogonal horizontal axis lines. A supported nut is provided, and a screw shaft integrated with the drive shaft of the control motor fixed to the horizontal support is screwed into the nut, or two positions on the same radius line that coincide with the two orthogonal horizontal axes of the adjusting plate. A means for abutting the spherical surface of the tip of the control rod, which is provided with an abutting concave portion on the back surface, and in which the rotation of the drive shaft of the control motor fixed to the horizontal support is converted into vertical movement by the linear motion converting means. Adopted. In either case, in order to eliminate the error due to the backlash in the vertical direction caused by the screwing of the male and female screws, the swing side adjustment plate and the fixed side horizontal support are connected by a tension spring.

In the uniaxial horizontal sensor, an electrode installation chamber for enclosing an electrolytic solution and bubbles has a predetermined radius centered on a point on a vertical line and an arc line that is bisected by the vertical line is orthogonal to the vertical line. A spindle-shaped rotary body obtained by rotating around a horizontal center line, which has a circular three-dimensional cross section perpendicular to the horizontal center line and has a three-dimensional surface roughness of the inner peripheral wall and a sealing end body. The electrode holder made of an insulating material, which is formed by the common electrode protruding in the radial direction inside the electrode placement chamber at a position corresponding to the vertical line, and symmetrical about the common electrode along the horizontal center line. At the position, a peripheral electrode that protrudes higher in the radial direction than the common electrode in the radial direction and has a uniform surface area penetrates in a liquid-tight state, and bubbles and surface tension in the electrode installation chamber are small. In between electrodes The common electrode is always immersed in the electrolyte solution without mixing the bubbles with the common electrode, and the surrounding electrodes do not touch the bubbles in the horizontal state. It is used by encapsulating each of them and outputting an analog signal from this.

In the biaxial horizontal sensor, the bottom surface is a horizontal surface, and the common electrode is located at the center of the inner bottom of the liquid chamber recess of the electrode holder made of an insulating material having the liquid chamber recess at the center of the plane. While penetrating in a dense state and piercing vertically,
Peripheral electrodes having a uniform surface area projecting higher than the common electrode are provided at the intersections of a predetermined radius circle whose center is the center of the inner bottom of the liquid chamber recess and two horizontal orthogonal axes passing through the center. A window plate made of an insulating material, such as glass, which is vertically penetrated in a liquid-tight state and has an upper opening portion of the electrode holder formed in a central portion or a spherical concave portion having a high surface roughness in the entire surface thereof. The spherical concave portion is the inner surface and the center is aligned with the central axis of the common electrode so as to be closed in a liquid-tight state. In the closed liquid chamber concave portion, bubbles and surface tension are small and impedance between electrodes is horizontal. The electrolytic solution mixed in such a ratio as to have a predetermined value in the state is sealed so that the common electrode is always immersed in the electrolytic solution, and an analog signal is output from this.

[0010]

DETAILED DESCRIPTION OF THE INVENTION AND

【Example】

(Embodiment) FIG. 1 is a schematic exploded front view showing an apparatus main body portion A of a horizontal marking-out laser device according to an embodiment of the present invention, which is roughly divided into three parts, and FIG. 2 is an adjustment block portion in FIG.
FIG. 3 is a schematic plan view of a portion (3), FIG. 3 is a plan view showing a switch and a shutter provided in a cover cap B portion to be covered with the apparatus main body portion, FIG. 4 is a vertical sectional view of a uniaxial horizontal sensor, and FIG. FIG. 6 is a cross-sectional view of the uniaxial horizontal sensor, and FIG. 7 is an explanatory diagram of sensor up of the uniaxial horizontal sensor.

A horizontal marking laser device according to an embodiment of the present invention will be described with reference to the above-mentioned drawings. It is composed of an apparatus main body portion A and a cover cap B which covers the apparatus main body portion A. Also, as shown in FIG. 3, a device activation switch (SW) and a slit (SL) for irradiating a laser irradiation line horizontally formed along the circumference on the body portion.
And a shutter (S) for opening and closing the slit (SL) by operating the device start switch (SW), and a hook (F) for equipping the body with a portable band (not shown). The apparatus main body portion A shown in solid line in FIG.
Is roughly divided into a main body base (1), a horizontal support (2), and an adjustment block (3) .The horizontal support (2) is fixed to the main body base (1), and the adjustment block (3 ) Is connected to and supported by the horizontal support (2) by means that allows swinging in at least two horizontal directions at right angles to the horizontal.

The main body base (1) is provided with three straight rods lower than the female screw cylinder (11) around the female screw cylinder (11) for mounting on a stand such as a tripod provided at the center of the bottom surface. Standing leg (12)
The main pillar (13) has a screw hole on the top surface at the center of the upper surface, and the space around the main pillar (1) is screwed through the main body base (1) to make the bottom side a replacement port. The battery storage cylinder (14) is provided upright.

The horizontal support (2) is an edge portion of the base plate (21) having mounting holes corresponding to the screw holes, and the center of the mounting holes is an intersection point. A motor shaft hole (22) is drilled at each of the constant radial positions on the two horizontal axes, and a drive shaft (26) having a screw shaft (27) at its tip is provided from below the motor shaft hole (22). The control motor (25) is fixed to the board (21) in a state where it is projected upward through the above, and further, the drive control of the control motor (25) is performed by the analog signal from the two uniaxial horizontal sensors (40) described below. Circuits and laser irradiation equipment (39)
The control circuit board C on which the power supply circuit is formed is fixed to the main pillar (13), and the guide pillar (23) for guiding the swinging direction of the adjusting block (3) is fixed.

Further, the adjustment block portion (3) has a hole for swinging support formed at the center thereof, and on the orthogonal horizontal two-axis line (31) which coincides with the orthogonal horizontal two-axis line of the horizontal support plate (2). At each position corresponding to the motor shaft hole (22),
An adjustment plate (36) with a smooth upper surface, which is equipped with a nut (35) swingably by a horizontal pin (34) parallel to each of the two orthogonal horizontal axes (31).
And the optical axis of the upper surface of the orthogonal horizontal two-axis line (31) is aligned with the plane, and the laser beam from the laser diode is horizontally transmitted by the rod lens (38) through the collimator lens. A laser irradiation device (39) fixed via a horizontal adjustment metal fitting so as to diffuse to form a laser irradiation line, and a bubble fixed in a plane T shape in parallel with each of the orthogonal horizontal biaxial lines (31). And a uniaxial horizontal sensor (40) for controlling the control motor (25) by detecting the position of the.

Since the laser irradiation device (39) has a well-known structure, the description of the structure within the range of the above description will be omitted, and the detailed structure description will be omitted.

The adjusting block part (3) is a spherical pair of a fulcrum shaft (28) of the tip spherical surface of the support fixed on the horizontal support (2) and the cap fixed on the adjusting plate (36). Means and the drive shaft of the control motor (25) fixed to the horizontal support (2)
The screw shaft (27) connected to (26) and the nut (35) supported by the adjusting plate (36) are screwed together on the horizontal support (2) so as to be swingably adjustable. , Screw shaft (27) and nut (3
In order to eliminate the backlash error in the vertical direction caused by the screwing in (5), the adjustment plate (36) on the swing side and the horizontal support (2) on the fixed side are connected by a tension spring (24). Has become.

In the uniaxial horizontal sensor (40), as shown in FIGS. 4 to 6, the inner wall of the electrode arrangement chamber (43) for enclosing the electrolytic solution (41) and the air bubbles (42) passes through the center. Point (P) on vertical line (V)
An arc line (AL) that has a predetermined radius centered at and is bisected by the vertical line (V) is a horizontal center line (H) that is orthogonal to the vertical line (V).
An inner wall surface of JIS Rmax 0.2S or less, which is a rotating body shape obtained by rotating around, and has a three-dimensional surface roughness with a circular cross section perpendicular to the horizontal center line (H) and a high three-dimensional surface roughness. The electrode holder (44) made of an insulating material (for example, made of polycarbonate, etc.) formed by the surrounding wall (44a) and the sealing end body (44b) has a metal material with a low ionization tendency such as 18K (Au). The vertical line where the surface of the
A common electrode (45) that projects radially through the electrode placement chamber (43) at a position corresponding to (V), and is symmetrical about the common electrode (45) along the horizontal center line (H) At the position, the peripheral electrode (46), which protrudes higher than the common electrode (45) in the radial direction in the electrode arrangement chamber (43) and has a uniform surface area, is provided in a liquid-tight manner, and the electrode arrangement is also provided. In the installation room (43),
The common electrode (45) is always mixed with the electrolyte solution (41) in which the bubbles (42) and the surface tension are small and the impedance between the electrodes is a predetermined value in a horizontal state.
Soaked in the air bubble (42) so that the surrounding electrode (46) does not touch the air bubble (42) in the horizontal state.
The structure is that it is sealed from (47) and sealed (48).

As the electrolytic solution (41), purified water is used as a solvent, magnesium sulfate is used as a solute, and anhydrous methanol or anhydrous ethanol is mixed as a solution at a ratio such that the impedance between electrodes is about 40 to 50 KΩ. Then
A material having a high boiling point and a low freezing point was used.

In the uniaxial horizontal sensor (40), as shown in the sensor-up explanatory diagram of FIG. 7, an alternating current (OSC) oscillator is used to form a predetermined 4 KHz basic pulse, and a frequency divider F / F outputs a duty of 50%. 2 KHz pulse, and this pulse is buffer amplifier SP1 and its opposite phase pulse buffer amplifier SP2
Is applied to the surrounding electrode (46) by means of the common electrode (45) in order to extract information from it, and the signal is drawn from the common electrode (45) to the signal amplifying circuit AMP1, and its output is passed through the amplifying circuit AMP2 having the zero drift correction function by the variable resistor VR1. The analog signal MP from the frequency divider F / F to the analog switch, and the analog signal synchronized by the analog switch is sent to the amplifier AMP3 via the sample-and-hold circuit SH1 and the amplifier AMP3. In the above, it is possible to output a predetermined analog signal in accordance with the inclination and control the analog signal to zero by the mechanical control means as described above using the analog signal to obtain a highly accurate horizontal degree of the inclination angle of zero. However, the mechanical control means is not limited to the above-mentioned means, and it is needless to say that the conversion means may be replaced with a known conversion means. No.

The slit (SL) is aligned with the laser irradiation direction of the laser irradiation device (39) on the device main body portion A having the above-mentioned configuration and the impedance between the electrodes is set to a predetermined value in the horizontal state. In this state, the cover cap B is capped and fixed to complete the horizontal marking laser device.

The horizontal marking-out laser device according to the present invention having the above-described structure is mounted on an arbitrary surface such as a room or fixed on a tripod base and turned on to turn on the horizontal support.
(2) The adjusting plate (36) swingably supported on the adjusting plate
The control motor (25) is driven by the output signals from the two uniaxial horizontal sensors (40) on the (36), which controls the adjusting plate (36) to be horizontal, and on the adjusting plate (36). Laser is emitted from the laser irradiator (39) fixed to the, and this is diffused by the horizontal rod lens (38) that passes through the optical axis and is radiated to the outside from the slit (SL) of the cover cap B, and the correct horizontal direction is obtained. The laser irradiation line is used to irradiate the wall surface, etc., and this line is used as a reference when performing work such as room layout and partitioning.

In the above embodiment, the case where two uniaxial horizontal sensors (40) are used has been described. Instead of this, the structure is shown in FIGS. 8 and 9, and the sensor up description is shown in FIG. Similar effects can be achieved by using the two-axis horizontal sensor (60) shown in the figure.

This biaxial horizontal sensor (60) will be described with reference to FIGS. 8 and 9. An electrode holder made of an insulating material in which the bottom surface (67) is a horizontal surface and a liquid chamber recess is formed in the center of the flat surface. At the center of the inner bottom of the liquid chamber recess (65) of (61), the common electrode (45) is pierced vertically in a liquid-tight manner,
A horizontal orthogonal biaxial line passing through the center of the inner bottom of the liquid chamber recess (65)
At the intersection of (X), (Y) and the circle with the specified radius, the common electrode (4
The four surrounding electrodes (46) having a uniform surface area protruding higher than that of (5) are pierced vertically in a liquid-tight manner so that the restricting body (6
8), and also the opening of the electrode holder (61), a window plate (63) made of an insulating material such as glass in which a central portion or the entire surface is formed into a spherical concave portion (62) having a high surface roughness, The spherical recess (62) of the window plate (63) is used as the inner surface, and the center is aligned with the central axis of the common electrode (45), and the holding screw frame (6
The liquid chamber is closed in 6) and mixed in the closed liquid chamber recess (65) with the bubble (42) and the surface tension is small and the impedance between the electrodes is a predetermined value in a horizontal state. The common electrolytic solution (41) is sealed and sealed from the sealing port (27) by an amount such that the common electrode (45) is always immersed in the electrolytic solution.

As shown in FIG. 10, the above-mentioned biaxial horizontal sensor (60) constitutes a basic pulse of 4 KHz with an oscillator OSC, and has a frequency divider F / F of two kinds of 1 KHz and 2 KHz with a duty of 50%. Pulses and each pulse is a buffer amplifier
Reverse phase alternating current pulse (X +, X-, Y +,
Y−) is applied to the peripheral electrode (46), and a signal is drawn from the common electrode (45) to the signal amplification circuit AMP1 in order to extract information, and its output has a zero drift correction function by the variable resistors VR1 and VR2. Two amplifier circuits AMP2 ・ AM
In addition to being drawn into the analog switch MP via P3, the two different types of pulses from the frequency divider F / F are drawn into the analog switch MP in the biaxial direction in the logic circuit G in synchronization with each other. Sampled the two-axis analog signals separated in
It is sent to the amplifiers AMP4 and AMP5 via the hold circuits SH1 and SH2, and individually output from the amplifiers AMP4 and AMP5 as analog signals according to each axis direction, and the mechanical control as described above using the analog signals. By controlling the analog signal to zero by means, it is possible to obtain a highly accurate horizontality with a tilt angle of zero.

[0025]

According to the horizontal marking-out laser device of the present invention having the above-described structure, at least two uniaxial horizontal sensors on the adjusting plate supported swingably in at least two orthogonal horizontal biaxial directions, or The biaxial horizontal sensor directly converts the change in impedance between the electrodes, which changes due to the position variation of the bubbles according to the placement surface, into an electrical signal and outputs it as an angle information signal as an analog signal. The mechanical control means automatically and accurately and rapidly controls the horizontal level of the analog signal so that the analog signal becomes zero, so that the laser irradiation should be performed at a predetermined position in the work place where horizontal marking is required. The laser beam from the laser irradiation device, which is adjusted and fixed on the adjustment plate, is diffused by the horizontal rod lens and the highly accurate positive direction is obtained only by setting the direction to the desired wall surface direction. As a horizontal continuous laser irradiation line, it is clearly displayed on a predetermined surface such as the surrounding wall surface, and can be used as a horizontal reference line when performing work such as room layout and partitioning, which enables efficient horizontal marking work. It can be carried out.

[Brief description of drawings]

FIG. 1 is a schematic exploded front view showing an apparatus main body portion A of a horizontal squeeze-out laser device according to an embodiment of the present invention, which is divided into approximately three parts.

FIG. 2 is a schematic plan view of an adjustment block section (3) in FIG.

FIG. 3 is a partial plan view showing a switch and a shutter provided in a cover cap B portion covered with the apparatus main body portion.

FIG. 4 is a vertical cross-sectional view of a uniaxial horizontal sensor used in the horizontal marking laser device according to the embodiment of the present invention.

FIG. 5 is a side view of the same-axis horizontal sensor.

FIG. 6 is a cross-sectional view of the same axis horizontal sensor.

FIG. 7 is an explanatory diagram of sensor up of a uniaxial horizontal sensor.

FIG. 8 is a vertical cross-sectional view of a biaxial horizontal sensor used in the horizontal marking laser device according to the embodiment of the present invention.

9 is a horizontal sectional view of the biaxial horizontal sensor of FIG.

FIG. 10 is an explanatory diagram of sensor up of the same two-axis horizontal sensor.

[Explanation of symbols]

 A Device body part B Cover cap C Wiring board (SW) Device start switch (SL) Slit (1) Main body base (2) Horizontal support (3) Adjustment block part (12) Direct mounting leg (13) Strut (14) Battery case with lid (21) Board (22) Hole for motor shaft (23) Guide post (24) Extension spring (25) Control motor (26) Drive shaft (27) Screw shaft (28) Shaft shaft (35) Nut (36) Adjustment plate (37) Mounting reference straight line (39) Laser irradiation device (40) Uniaxial horizontal sensor (41) Electrolyte solution (42) Bubble (44) Electrode holder (45) Common electrode (46) Surrounding electrode (60 ) Biaxial horizontal sensor

Claims (5)

[Claims] 1. A horizontal support body is fixed to a support column which is erected on a body base, and a support shaft which is erected and fixed on the horizontal support body is swingable in at least two horizontal axis directions orthogonal to the horizontal support body. A main body of the apparatus, further comprising means for controlling the swing of the adjusting plate by rotation of a plurality of control motors attached to the horizontal support at positions corresponding to the swing direction of the adjusting plate. And a laser irradiation device configured to form a laser irradiation line by horizontally diffusing a laser beam irradiated in a direction parallel to one of the two orthogonal horizontal axis lines with a vertical rod lens whose center passes through the optical axis, Consisting of two uniaxial horizontal sensors or two uniaxial horizontal sensors each of which outputs as an analog signal a plurality of angle information signals detected by electrical detection means corresponding to the position of the bubble, A laser irradiation device and two uniaxial horizontal sensors, or two uniaxial horizontal sensors, are fixed so as to be aligned in the directions of the two orthogonal horizontal biaxial lines on the adjusting plate of the main body of the device, and the control motor is controlled by a control signal from any one of the horizontal sensors. A laser device for horizontal marking out, which is characterized by driving a laser. 2. The adjusting means by the control motor of the adjusting plate,
At two points on the same radial line of the adjusting plate which coincide with the two orthogonal horizontal axes, nuts swingably supported by horizontal pins orthogonal to the respective axes are provided, and the control motor fixed to the horizontal support body is provided on the nuts. 2. A horizontal marking laser device according to claim 1, wherein a screw shaft integral with the drive shaft is screwed, and the peripheral edge of the adjusting plate and the horizontal support are connected by a tension spring. 3. The adjusting means by the control motor of the adjusting plate,
The adjustment plate is provided with contact recesses at two rear surfaces on the same radial line that coincides with the two orthogonal horizontal axes, and the rotation of the drive shaft of the control motor fixed to the horizontal support is fixed to the contact recesses by the linear motion conversion means. 2. The horizontal marking laser device according to claim 1, wherein the tip spherical surface of the control rod converted into vertical movement is brought into contact with the peripheral edge of the adjusting plate and the horizontal support member is connected by a tension spring. 4. A uniaxial horizontal sensor is characterized in that an electrode installation chamber for enclosing an electrolyte and air bubbles has an arc line having a predetermined radius centered on a point on the vertical line and bisected by the vertical line. A rotating body shape obtained by rotating around a horizontal centerline orthogonal to the horizontal centerline, wherein the horizontal centerline has a circular cross-section at a right angle, and the surrounding wall of the inner peripheral wall surface with high three-dimensional surface roughness and the sealing end body. The electrode holder made of an insulating material, which is formed by the common electrode protruding in the radial direction inside the electrode placement chamber at a position corresponding to the vertical line, and symmetrical about the common electrode along the horizontal center line. At the position, a peripheral electrode that protrudes higher in the radial direction than the common electrode in the radial direction and has a uniform surface area penetrates in a liquid-tight state, and bubbles and surface tension in the electrode installation chamber are small. Impedance between electrodes The common electrode is always immersed in the electrolytic solution without touching the air bubbles, and the surrounding electrodes do not touch the air bubbles in the horizontal state. 4. The horizontal marking-out laser device according to claim 1, 2 or 3, which is encapsulated and outputs a control signal for controlling the control motor. 5. The biaxial horizontal sensor has a bottom surface as a horizontal plane,
A common electrode is vertically penetrated through the common electrode in a liquid-tight state at the center of the inner bottom of the liquid chamber recess of the electrode holder made of an insulating material having a liquid chamber recess formed in the center of the plane. At the intersection of a predetermined radius circle whose center is the center of the inner bottom of the recess and a horizontal orthogonal biaxial line passing through the center, outer peripheral electrodes having a uniform surface area protruding higher than the common electrode are liquid-tightly sealed. Of a window plate made of an insulating material such as glass having a spherical recess having a high surface roughness formed in the central opening or the entire upper opening of the electrode holder, The inner surface is closed in a liquid-tight state with its center aligned with the central axis of the common electrode, and the closed cavity for liquid chamber has a predetermined surface tension and a small surface tension and a horizontal impedance between the electrodes. The electrolytic solution mixed in the ratio Enclosed by an amount that emissions electrode immersed always in the electrolyte, horizontal marking laser device and outputs a control signal for controlling the control motor according to claim 1, 2 or 3 wherein.