JP2003012345A - Method for coloring heat protection glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To draw a character or a pattern with color on a heat protection glass with good positional precision. SOLUTION: This method for coloring heat protection glass obtained by coating the surface of a plate glass with a thin film laminated of Ag film and a metal oxide film comprises the steps of irradiating a laser light by a laser light irradiating device in scanning manner to melt the heat protection film, then revealing a scattering phenomenon or diffraction phenomenon of a visible light due to microparticles obtained by coagulation or a diffraction grating consisting of the microparticles to develop color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing a heat ray-shielding glass by irradiating it with a laser beam for drawing.

[0002]

2. Description of the Related Art A heat ray blocking film (Lo) having a function of reflecting infrared rays, which is formed by laminating a metal oxide film such as a tin oxide film or a zinc oxide film and a silver film (Ag film) on a surface of a plate glass.
The heat ray-shielding glass coated with w-E film is Low-E.
It is commonly called glass.

Hereinafter, a heat ray shielding film formed by laminating a metal oxide thin film such as a tin oxide film or a zinc oxide film and an Ag film is referred to as a Low-E film, and a heat ray shielding film formed by covering the Low-E film is cut off. The glass is called Low-E glass.

Usually, the Low-E film has a structure of three or more layers in which the Ag film is sandwiched between metal oxide thin films such as zinc oxide or tin oxide in order to prevent deterioration due to oxidation and migration of the Ag film. And is formed by a sputtering method or a CVD method using a plate glass as a base. The Ag film layer of the Low-E film has a film thickness of about 10 to 20 nm and is transparent because it is extremely thin, and metal oxides such as zinc oxide and tin oxide are transparent as long as it is a thin film of about 100 nm. Therefore, since the Low-E film transmits visible light, the Low-E film obtained by coating the clear glass with the Low-E film is used.
The E glass is colorless and transparent when visually observed.

On the other hand, a method of irradiating a transparent object such as a plate glass with a laser beam to perform laser marking is disclosed in JP-A-3-124486, JP-A-4-71792 and JP-A-11-156568. It is disclosed.

Japanese Unexamined Patent Publication (Kokai) No. 3-124486 discloses a laser marking method in which laser light is focused on the inside of an object to mark the inside of the object without damaging the surface. However, in the laser marking method described in the publication, when the object is glass, there is a problem that when the laser light is focused inside, a crack may occur and reach the surface, which makes the object fragile. It was

Further, in Japanese Patent Laid-Open No. 4-71792,
There is disclosed a method of marking by selectively opaqueizing the inside of the transparent substrate by irradiating the inside of the transparent substrate with a laser beam so as to focus. However, in the marking method described in this publication, it is possible to mark the inside of the glass by laser irradiation,
Since the focus position of the laser beam cannot be strictly controlled in the depth direction of the material, there is a problem that it is not suitable for marking a thin transparent material.

Further, in Japanese Patent Laid-Open No. 11-156568, laser light in a wavelength range which transmits a marking object is
A method of marking by focusing on the inside of an object using an fθ lens is disclosed. However, in the marking method described in the publication, since the marking is due to internal cracks caused by irradiation with laser light,
There is a problem that marking objects are limited to transparent materials.

[0009]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
No. 0, JP-A-3-124486, JP-A-4-124
The method described in Japanese Patent No. 71792 or Japanese Patent Laid-Open No. 11-156568 is a method of laser-marking characters, patterns, etc. on a transparent material such as glass. Since it is a method of marking by opacity due to cracks generated inside, there is a problem that it is difficult to write extremely fine particles in the unit of micron (μm), and chromatic coloring cannot be performed.

An object of the present invention is to provide a method for coloring a heat-shielding glass which enables fine drawing by coloring the heat-shielding glass with a laser beam.

[0011]

The present inventors have moved the irradiation position of laser light when irradiating the heat ray blocking film, so-called Low-E film, coated on a glass substrate with laser light, that is, laser. By scanning the light, Low-
By aggregating the E film into fine particles, visible light can be scattered to color the Low-E glass, or the visible light is diffracted by a diffraction grating formed by the fine particles.
It was found that the glass with the ow-E film can be colored. L
When the ow-E film is irradiated with laser light, for example, the zinc oxide thin film and the Ag film, which are metal oxide thin films, melt. After the laser beam scanning, the drawing line which is the laser beam scanning portion was observed with a laser microscope. As a result, amorphous fine particles in which zinc oxide and silver were aggregated were formed on the drawing line. It is assumed that the amorphous fine particles in which zinc oxide and silver are aggregated scatter visible light due to the aggregated silver.

With the laser irradiation device used in the present invention,
When the beam diameter of the laser light was narrowed down to 60 μm on the Low-E film surface and the laser light was scanned, a stripe-shaped irradiation portion with a width of 30 μm, that is, a drawing in which the Low-E film with a film thickness of 100 nm was melted Fine particles were generated in the line. It was also found that by scanning with a laser beam, the fine particles are regularly arranged in the drawing line to form a diffraction grating, which causes coloring.

The present invention relates to Low-E of Low-E glass.
That the film is scanned with laser light to once melt the Low-E film, and then the fine particles generated by aggregating on the scanning line or the diffraction grating formed by the fine particles scatter or diffract visible light. Is a method of coloring Low-E glass for drawing characters and patterns.

The present invention irradiates a laser beam to a heat ray-shielding glass obtained by coating a thin film obtained by laminating an Ag film and a metal oxide film on the surface of a plate glass with a laser beam irradiation device,
A method for coloring a heat ray-shielding glass, characterized in that after the heat ray-shielding film is melted, the fine particles produced by aggregating silver and a metal oxide cause a visible light scattering phenomenon to appear and be colored.

Furthermore, the present invention irradiates a heat ray shielding glass obtained by coating a thin film obtained by laminating an Ag film and a metal oxide film on the surface of a plate glass with a laser light irradiating device while irradiating with laser light while scanning. Coloring of heat ray-shielding glass characterized by forming a diffraction grating by the fine particles generated by aggregating silver and metal oxides after melting the heat ray-shielding film, and causing the visible light diffraction phenomenon to appear and to be colored. Is the way.

Furthermore, the present invention is the above method for coloring heat-ray shielding glass, characterized in that the laser beam irradiation device is a laser beam irradiation device comprising a laser oscillator, a light modulator, a galvanometer mirror and an fθ lens. .

Furthermore, the present invention is characterized in that the laser light irradiation device is a laser irradiation device including a laser oscillator, an optical modulator, a condenser lens mounted on a linear translator, an objective lens, and a galvanometer mirror. This is a method for coloring the above heat ray-shielding glass.

Further, according to the present invention, the laser oscillator is a continuous laser oscillator or a pulse laser oscillator, and the type of laser light used is infrared light, near infrared light or ultraviolet light. It is a method of coloring glass.

Further, the present invention is the above method for coloring a heat-ray shielding glass, characterized in that the light modulator is an acousto-optic modulator or an electro-optic modulator.

Furthermore, the present invention is the above-mentioned method for coloring a heat-ray shielding glass, characterized in that the irradiation position of the laser light on the heat-ray shielding glass is moved by a plurality of galvanometer mirrors.

Furthermore, the present invention is the method for coloring a heat ray-shielding glass as described in any one of the above, characterized in that the heat ray-shielding glass is moved by a stage movable in the horizontal or vertical direction.

Further, the present invention is the heat ray-shielding glass characterized in that characters and patterns are drawn by the above-mentioned method of coloring the heat ray-shielding glass.

Furthermore, the present invention is a heat ray-shielding glass which is wholly or partially colored by the above-mentioned method for coloring a heat ray-shielding glass.

Further, the present invention is a method of erasing the drawn or colored portion of the above heat ray-shielding glass by heating it to a temperature above the softening point of the glass.

The laser oscillator, which is a component of the laser irradiation device used in the method for coloring the heat-shielding glass of the present invention, comprises:
Either a continuous laser oscillator that emits laser light continuously or a pulsed laser oscillator that emits laser light in a pulsed manner may be used.

The type of laser light used is infrared light,
Near-infrared light, visible light or ultraviolet light can be mentioned, and a wavelength of 100
Light having a wavelength of not less than 1 nm and not more than 1 mm (10 ⁶ nm) can be used, and for example, an argon ion laser oscillator or a UV pulse laser oscillator can be used.

The optical modulator, which is a component of the laser irradiation apparatus used in the method for coloring the heat ray-shielding glass of the present invention, serves as a switching element. That is, the ON / OFF of the irradiation of the laser beam to the workpiece is accurately controlled by changing the traveling direction of the laser beam or switching between blocking and transmitting. By turning on / off,
Characters and drawings are non-continuous, and various drawing can be supported. The optical modulator is an acousto-optical modulator (hereinafter abbreviated as AOM).
Alternatively, either an electro-optic modulator (hereinafter abbreviated as EOM) may be used.

The AOM is an element that changes the optical path of laser light. In the ON state, a radio frequency RF signal is emitted, input to a piezoelectric element, that is, a transducer, converted into ultrasonic waves, and compression waves are generated in the quartz glass. A diffraction grating formed in the quartz glass by the compressional wave diffracts the laser light to change its optical path. On the other hand, in the OFF state, since the RF wave is not emitted, the diffraction grating due to the compressional wave is not formed, and the laser light goes straight in the quartz glass.

The EOM is a switching element that passes or blocks laser light by applying a voltage to the electro-optical element to change the polarization direction.

The galvanometer mirror, which is a component of the laser irradiation apparatus used in the method for coloring the heat ray-shielding glass of the present invention, comprises a plurality of mirrors, usually an X mirror and a Y mirror, and the laser beam is changed by changing the inclination of the mirror. It is possible to shake the optical axis of. The X mirror and the Y mirror change the direction while controlling the angle, and oscillate the optical axis of the laser light to scan the laser light on the Low-E film of the Low-E glass which is the object. On the scanning line, fine particles produced by aggregating silver and metal oxide after the Low-E film was melted,
Alternatively, a fine diffraction grating can be formed by the fine particles. The fine particles or the diffraction grating scatters or diffracts the incident light to the Low-E glass to color the heat ray blocking glass.

The laser irradiation device used in the present invention narrows down the laser light, scans it on the Low-E glass while swinging the optical axis of the laser light with a galvanometer mirror,
Since the ow-E film has a resolution capable of writing several tens or more lines within a 1 mm interval and can scan a laser beam at a high speed of 1 mm / s or more, it is suitable for writing a diffraction grating. It is suitable.

According to the method of coloring Low-E glass of the present invention, characters or patterns can be drawn on Low-E plate glass. For example, on the heat shield glass, the serial number in rainbow color,
Character information such as manufacturing date and manufacturer name can be easily written.

Further, the method for coloring a heat ray-shielding glass of the present invention using laser light irradiation has a small energy loss, a short tact time in actual production, and is excellent in economical production.

As the components of the laser irradiation device used in the method for coloring the heat ray-shielding glass of the present invention, an fθ lens or a condenser lens (hereinafter abbreviated as Z lens) mounted on a linear translator and an objective lens are used. , Plays a role of correcting the focal position of the laser beam scanned in an arc shape by the galvanometer mirror.

A stage which is a constituent of a laser irradiation device used in the method for coloring a heat-shielding glass of the present invention and which is movable in a horizontal direction or a vertical direction, for example, an X-Y axis movable in a horizontal direction with respect to an irradiation surface. The Z-axis stage that can move in the direction perpendicular to the stage can efficiently color the heat-ray shielding glass by moving the heat-ray shielding glass when scanning the laser light at high speed. In addition, by moving the heat-shielding glass attached to the movable stage at regular intervals and then leaving it stationary, the laser beam is scanned by the galvanometer mirror described above to perform drawing, and thus multiple diffraction gratings are arranged at regular intervals. Can be drawn.

According to the method of coloring the heat ray-shielding glass of the present invention, the L-E glass is colored on the entire surface or on a part thereof.
The ow-E glass can be obtained by using a plurality of laser devices used in the present invention. In addition, Low
Even if the -E film is scanned with laser light to melt and aggregate the Low-E film to generate fine particles, the fine particles are scattered in the laser light irradiation part, and silver is aggregated in the fine particles. , There is a concern that the heat ray reflection function of the Low-E film may be deteriorated, but it is not lost.

The colored Low-obtained thus obtained
When the E glass is heated to a softening point or higher and melted, the agglomerated silver diffuses inside the glass in the colored portion and returns to colorless and transparent, which facilitates recycling.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an example of a laser irradiation apparatus used in the present invention which uses an fθ lens for controlling the focal position of laser light. The fθ lens 5 targets the laser light scanned by the galvanometer mirror 6
Focus on.

The laser light emitted from the argon ion laser oscillator 1 which is the continuous laser oscillator 1 passes through the AOM 2 which is a switching element and is then reflected by the X mirror 3 and the Y mirror 4 which are galvanometer mirrors.
After passing through the fθ lens 5, the target 6 is Low
Irradiate the E glass 6. By moving the X mirror 3 and the Y mirror 4 while controlling them to reciprocate the optical axis,
Fine particles produced by melting and then aggregating the Low-E film of the -E glass 6 or the fine particles form a diffraction grating. The fine particles or diffraction grating scatters or diffracts incident light to color the heat ray-shielding glass.

When coloring the Low-E glass 6, a heat ray blocking film is formed on the XYZ-stage 7 consisting of an XY axis stage movable horizontally with respect to the irradiation surface and a Z axis stage movable vertically. By mounting the attached glass substrate and moving the stage 7, the portion to be colored is moved.

The digital command data input to the computer 10 is transferred to the digital-analog converter 11
(Hereinafter abbreviated as DAC) is converted into an analog signal. The AOM driver 8 converts a laser modulation signal, which is transmitted from the computer 10 and converted into an analog signal by the DAC 11, into a radio frequency signal, that is, an RF signal, and a piezoelectric element, that is, a transducer (not shown) in the AOM 2 To generate ultrasonic waves.
The laser light incident on the AOM 2 is diffracted by the diffraction grating formed by the ultrasonic waves, and its optical path changes. As a result, the laser light is turned on / off. On the other hand, it is input to the computer 10 as digital command data and the DAC
The control signal converted into an analog signal by 11 is received by the servo driver 9, and the servo driver 9 causes the X mirror 3 and the Y mirror which are galvanometer mirrors.
The operation of the mirror 4 is controlled, and the Low-E glass 6 is Low.
After the laser beam is scanned on the -E film to dissolve the Low-E film, fine particles produced by aggregating or a diffraction grating formed by the fine particles are produced. The pattern written on the heat ray blocking glass 6 by the laser light can be easily changed by changing the digital command data.

FIG. 2 is an explanatory view of an example of a laser irradiation apparatus used in the present invention which uses a Z lens and an objective lens for controlling the focal position of laser light. Of the Z lens 12 and the objective lens 13, the Z lens 12 mounted on the linear translator is moved along the optical axis by the linear translator to control the laser beam diameter on the irradiation surface of the heat ray blocking glass 6.

In the UV pulse laser oscillator 1 which is the pulse laser oscillator 1, an optical modulator made of AOM or EOM is usually already incorporated as a so-called Q switch. The laser light emitted from the UV pulse laser oscillator 1 passes through the Z lens 12 and then the objective lens 13, is reflected by the X mirror 3 and the Y mirror 4 which are galvanometer mirrors, and then is the target 6, Lo.
Irradiate the w-E glass 6. The X and Y mirrors are controlled to move to reciprocally move the optical axis, thereby
Fine particles or a diffraction grating formed of the fine particles is formed on the Low-E film of the -E glass 6. The fine particles or diffraction grating scatters or diffracts incident light to color the heat ray blocking glass.

When coloring the heat ray-shielding glass 6, an XYZ-stage 7 consisting of an XY axis stage movable in the horizontal direction and a Z axis stage movable in the vertical direction with respect to the irradiation surface is provided with a heat ray shielding film. Glass substrate mounted, stage 7
The part to be colored is moved by moving.

The control signal input to the computer 10 as digital command data and converted into an analog signal by the DAC 11 is received by the servo driver 9, and the servo driver 9 causes the Z lens 12 and the X mirror 3 which is a galvanometer mirror. The Y-mirror 4 is driven while controlling the operation of the Low-E glass 6.
The diffraction grating is formed by reciprocating the irradiation position of the laser light on the -E film while scanning. The contents of writing on the heat-shielding glass 6 by laser light can be easily changed by changing the digital command data.

The method of coloring the heat-shielding glass of the present invention is more durable than the heat-shielding glass without damaging the heat-shielding glass, as compared with the conventional method of marking a plate glass which causes a crack in the laser light condensing portion. Excel.

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following examples.

Further, the method of the present invention for drawing a periodic structure, that is, a diffraction grating by scanning the laser beam on the glass with a thin film by reciprocating the optical axis is not limited to the Low-E film.
In the case of film-coated glass capable of forming a fine structure by irradiation with laser light, visible light can be scattered or diffracted by the diffraction grating to color the plate glass.

The Low-E glass used in the present invention is
It is a glass coated with a Low-E film composed of an Ag film and a metal oxide thin film, and a metal nitride thin film or the like may be added to the film structure in order to improve the durability of the film and the heat ray reflection performance.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, it is possible to move in a horizontal direction with respect to an argon ion laser oscillator 1 and an AOM 2 which are continuous laser oscillators, an X mirror 3 which is a galvanometer mirror, a Y mirror 4, an fθ lens 5 and an irradiation surface. X-
It consists of a holder attached to an XYZ-stage 7 consisting of a Y-axis stage and a Z-axis stage movable in the vertical direction,
The Low-E glass 6 which is the target 6 is attached to the holder.

FIG. 3 is an explanatory view of the laser irradiation device used in the embodiment.

The laser beam oscillated from the argon ion laser oscillator 1, that is, the laser beam 14 is the AOM.
After passing 2, it is reflected by the X mirror 3 and the Y mirror 4,
Then, it passed through the fθ lens 5 and was irradiated onto the heat ray blocking film surface of the Low-E glass 6 which is the target 6 attached to the holder.

The Low-E glass 6 was formed on a soda-lime silicate glass substrate having a plate thickness of 5 mm and a size of 100 mm × 100 mm by a low-E method by a sputtering method.
A film is coated so that the film constitution is 40 nm zinc oxide / 20 n silver
A Low-E glass having a three-layer structure of m / zinc oxide 40 nm and a total film thickness of 100 nm was prepared.

The laser light output is 2.2 W, and Low-
The laser beam 14 was focused on the E film. The optical axis of the laser beam 14 was swung by ON / OFF of the laser beam by the AOM 2 and the angle control of the X mirror 3 and the Y mirror 4, and the Low-E film was scanned at a scanning speed of 100 mm / sec. In this way, a diffraction grating of 10 lines / mm was drawn in a range of 10 mm × 80 mm. Then XY
By manipulating the Z-stage 7 to move it horizontally at intervals, for example, and then stopping it, a plurality of 10 mm × 80 mm diffraction gratings could be drawn at equal intervals. The part irradiated with the laser beam 14 was colored from red to purple depending on the viewing angle of the reflected color.

FIG. 4 is a laser microscope photograph of the leading end of a writing line obtained by scanning the Low-E film with laser light.

Further, FIG. 5 is a laser microscope photograph of the center portion of the drawing line obtained by scanning the Low-E film with laser light.

The drawing line 15 when the low-E film was irradiated with laser light was observed with a laser microscope, and FIG.
As shown in FIG. 5, fine particles 16 with an average size of about 600 nm are generated due to the aggregation of the Low-E film after melting in a single drawing line having a width of 30 μm. Size 3000nm on the periphery
A fine periodic structure in which fine particles 16 'of about 1000 nm were regularly arranged was observed. The fine particle portion is observed brightly, contains a large amount of silver, and scatters visible light.

[0058]

According to the method of coloring a heat ray-shielding glass of the present invention, a heat ray-shielding glass obtained by coating the surface of a sheet glass with a thin film obtained by laminating an Ag film and a metal oxide film, that is, L
The beam diameter of the laser light is narrowed to the surface of the Low-E film of the ow-E glass, the laser light is scanned while reciprocating the optical axis, and the Low-E film is melted, and then fine particles aggregated and deposited,
Alternatively, a diffraction grating made of the fine particles may be formed, and the laser light scanning portion may be colored by interference when scattering or diffracting visible light, so that characters and patterns can be drawn on the Low-E glass.

With the laser irradiation apparatus used in the present invention,
Characters and designs can be drawn with precision. Further, by moving the stage at equal intervals, it is possible to draw a plurality of characters, patterns, etc. at equal intervals. The colored portion colored with a chromatic color is highly decorative.

The heat ray-shielding glass (Low-E glass) colored by the heat ray-shielding glass coloring method of the present invention is
When heated and melted above the softening point, the silver in the colored part diffuses inside the glass and returns to colorless and transparent, which facilitates recycling.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a laser irradiation apparatus used in the present invention, which uses an fθ lens for controlling a focus position of laser light.

FIG. 2 is an explanatory diagram of an example of a laser irradiation apparatus used in the present invention, which uses a Z lens and an objective lens for controlling the focal position of laser beam light.

FIG. 3 is an explanatory diagram of a laser irradiation device used in an example.

FIG. 4 is a laser micrograph of a leading end of a drawing line obtained by scanning a Low-E film with laser light.

FIG. 5 is a laser microscope photograph of a central portion of a drawing line in which a Low-E film is scanned with laser light.

[Explanation of symbols]

1. Laser oscillator 2. Acousto-optic modulator (AOM) 3. X mirror 4. Y mirror 5. fθ lens 6. Target (Low-E glass) 7. XYZ-stage

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Nishikawa             Central, 1510 Oguchi-cho, Matsusaka City, Mie Prefecture             Glass Co., Ltd. Glass Research Center (72) Inventor Hiroyuki Tamon             Central, 1510 Oguchi-cho, Matsusaka City, Mie Prefecture             Glass Co., Ltd. Glass Research Center (72) Inventor Hiroshi Uemura             Central, 1510 Oguchi-cho, Matsusaka City, Mie Prefecture             Glass Co., Ltd. Glass Research Center (72) Inventor Kohei Kakuno             1-83-1 Midorigaoka, Ikeda, Osaka Prefecture             AIST Kansai Center             Within (72) Inventor Tomoko Akai             1-83-1 Midorigaoka, Ikeda, Osaka Prefecture             AIST Kansai Center             Within (72) Inventor Masaru Yamashita             1-83-1 Midorigaoka, Ikeda, Osaka Prefecture             AIST Kansai Center             Within (72) Inventor Tetsuo Yazawa             1-83-1 Midorigaoka, Ikeda, Osaka Prefecture             AIST Kansai Center             Within F-term (reference) 4G059 AA01 AB05 AB11 AC06 AC08                       DA01 DB02 EA01 EA02 EB01                       EB04 GA02 GA04 GA14

Claims (11)

[Claims] 1. A laser beam irradiating device irradiates a laser beam to a heat beam blocking glass obtained by coating a flat glass surface with a thin film obtained by laminating an Ag film and a metal oxide film, thereby melting the heat beam blocking film. Then, a method for coloring a heat ray-shielding glass is characterized in that a fine particle formed by aggregating silver and a metal oxide causes a visible light scattering phenomenon to appear to be colored. 2. A heat ray-shielding glass, which is obtained by coating a thin film obtained by laminating an Ag film and a metal oxide film on the surface of a plate glass, is irradiated with a laser beam while scanning with a laser beam irradiating device to form the heat ray-shielding film. A method for coloring heat-shielding glass, which comprises melting and then forming a diffraction grating by fine particles produced by aggregating silver and metal oxides, and causing a diffraction phenomenon of visible light to appear to be colored. 3. The laser light irradiation device is a laser oscillator,
A laser light irradiation device comprising an optical modulator, a galvanometer mirror, and an fθ lens.
Alternatively, the method for coloring the heat ray-shielding glass according to claim 2. 4. The laser light irradiation device is a laser oscillator,
The method for coloring a heat ray-shielding glass according to claim 1 or 2, which is a laser irradiation device including a light modulator, a condenser lens mounted on a linear translator, an objective lens, and a galvanometer mirror. 5. The laser oscillator is a continuous laser oscillator or a pulse laser oscillator, and the type of laser light used is infrared light, near infrared light or ultraviolet light. The method for coloring a heat ray-shielding glass according to any one of claims. 6. The optical modulator according to claim 1, wherein the optical modulator is an acousto-optic modulator or an electro-optic modulator.
The method for coloring the heat ray-shielding glass according to any one of 1. 7. By a plurality of galvanometer mirrors,
The method for coloring a heat ray-shielding glass according to any one of claims 1 to 6, wherein the irradiation position of the laser beam on the heat ray-shielding glass is moved. 8. The method of coloring a heat ray-shielding glass according to claim 1, wherein the heat ray-shielding glass is moved by a stage movable in a horizontal direction or a vertical direction. 9. A heat ray-shielding glass, wherein characters and patterns are drawn by the method for coloring the heat ray-shielding glass according to any one of claims 1 to 8. 10. A heat ray-shielding glass which is wholly or partly colored by the method for coloring a heat ray-shielding glass according to any one of claims 1 to 9. 11. A method of erasing a drawn or colored portion of the heat ray-shielding glass according to claim 9 or 10 by heating it to a temperature equal to or higher than the softening point of the glass.