JP2003055006A - Laminated glass and edge light device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make colored door glass usable and to emit light at sufficient luminance at its ends. SOLUTION: The sandwich glass 1 laminated with a plurality of glass panes and an intermediate film 1e disposed between the respective glass panes includes the first glass pane (inner sheet 1b) of >=87% in visible ray transmittance when a sheet thickness is converted to 5 mm and the colored second glass pane (outer sheet 1a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass and an edge light device, and more particularly to a laminated glass and an edge light device used as a door glass of an automobile.

[0002]

2. Description of the Related Art Conventionally, door glass for automobiles is designed to reduce the inflow of heat energy from solar radiation into the passenger compartment.
In addition, colored glass is sometimes used to protect the inside of the vehicle from the outside and protect privacy.

On the other hand, some automobile doors in which the upper end portion of the door glass is not covered by the window frame, so-called hardtop doors, have an edge light function. This is a device in which a light source such as an LED (light emitting diode) is housed in the door body, and light emitted from this light source is incident from the lower end portion of the door glass to cause the upper end portion to emit light, such as at night. It is possible to inform passengers that the door glass is open.

However, when colored glass is used for the door glass, since the colored glass has a lower light transmittance than the transparent glass, the light incident from the lower end portion is guided while being guided inside the glass plate. It is attenuated, and the emission brightness at the upper end is reduced. As a result, there has been a problem that the function as an edge light cannot be fully achieved.

Therefore, in order to solve such a problem, in Document 1 (Japanese Patent Laid-Open No. 2000-264679, "Green Coated Glass Substrate and Manufacturing Method Thereof"), instead of using colored glass, the surface of a transparent glass plate is used. Patent Document 1 discloses a technique for coating a door glass with a film made of a metal oxide and improving the brightness at the edge. Further, Document 2 (Japanese Patent Laid-Open No. 2001-10584).
9 "edge light device"), a technique is disclosed in which all two glass plates constituting the laminated glass are colored and the light from the light source is guided into the interlayer film.

[0006]

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention
As described above, when a coating is applied to the surface of the glass plate, there is a problem that when the door glass is slid up and down, it is rubbed with surrounding parts and the coating is easily scratched.

In order to guide light into the intermediate film as in Reference 2, it is necessary to use an organic resin film having an extremely excellent light transmittance as a material of the intermediate film, and such a material is usually used. Is expensive, which increases the manufacturing cost of door glass. Further, even if any intermediate film having excellent light transmittance is used, it is inferior to transparent glass, and in order to easily guide light, it is necessary to increase the thickness of the intermediate film as much as possible. is there. As a result, there is a problem that the thickness of the door glass becomes thicker than the conventional one, and new restrictions are imposed on the designability and design viewpoint of the automobile door.

The present invention has been made to solve the above problems and allows colored door glass to be used, and
It is an object of the present invention to provide a laminated glass and an edge light device capable of emitting light with sufficient brightness at an end portion.

[0009]

In order to achieve such an object, the present invention provides a laminated glass in which a plurality of glass plates and an intermediate film provided between the respective glass plates are laminated. Provided is a laminated glass comprising a first glass plate having a visible light transmittance of 87% or more in terms of a thickness of 5 mm and a colored second glass plate. Further, as another aspect of the present invention, it is preferable to use it as a door glass for an automobile.

Further, it is preferable that the intermediate film contains infrared ray shielding fine particles. Further, the infrared shielding fine particles are preferably made of at least one selected from tin-doped indium oxide and antimony-doped tin oxide.

The present invention also provides an edge light device comprising the laminated glass and a light source for making light incident on an end portion of the first glass plate.
By using the present invention, it is possible to emit light with sufficient brightness at the end portion, and there is no problem such as scratches during ascent / descent.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing one embodiment of the present invention. As shown in the figure, a laminated glass 1 used as a door glass is an outer plate 1a that is a glass plate on the outside of the vehicle, an intermediate film 1c made of an organic resin such as polyvinyl butyral, and a glass plate on the inside of the vehicle. It is composed of a plate 1b.

A light source 2 such as an LED is installed at the lower end of the laminated glass 1, and the light emitted from the light source 2 is applied to the inner plate 1b.
The light enters the inner plate 1b from the lower end thereof and guides the light inside the inner plate 1b, and the upper end thereof emits light. The laminated glass 1 is fixed to a vertically slidable support member (not shown), and the portion fixed to the support member is housed in an automobile door (not shown). The vertical movement of the support member is performed by a drive unit (not shown) including a motor and the like. Known techniques are used for the support member, the drive unit, and the like.

The outer plate 1a is a colored glass plate, and for example, soda lime silica glass colored in green is used. The inner plate 1b is made of a transparent glass plate, and its visible light transmittance is 87% especially when the plate thickness is converted to 5 mm.
Made of the above materials. The visible light transmittance Tv [%] of the standard light D65 (average daylight including the ultraviolet region specified by the International Commission on Illumination) in the plate thickness direction when the plate thickness is converted to 5 mm is calculated by the formula (1). Is required by using.

[0015]

[Equation 1]

Here, Tva is the visible light transmittance [%] measured with a glass plate having a thickness of ta, and ta is the actual thickness [mm] of the measured glass plate.

Thus, the visible light transmittance Tv of the inner plate 1b is
By adjusting, it is possible to cause the upper end portion to emit light with sufficient brightness. For example, in a door glass having a height of 40 cm, the visible light transmittance Tv in the plate thickness direction is 8
When it is 7% or more, the visible light transmittance from the lower edge where light is incident to the upper edge where light is emitted is 1
%, The edge can be illuminated with a sufficient amount of light. On the other hand, the visible light transmittance T in the plate thickness direction
When v is less than 87%, the visible light transmittance decreases from the lower side to the upper side of the glass plate, so that the edge cannot be illuminated with a sufficient light amount.

The inner plate 1b may be colored so that the visible light transmittance of the outer plate 1a becomes 87% or more when the plate thickness is converted to 5 mm. Further, instead of coloring the glass plate, the intermediate film 1c is colored, and the visible light transmittance of the glass plate (either the outer plate 1a or the inner plate 1b or both) is 87 when the plate thickness is converted to 5 mm. You may make it more than%.

[Infrared shielding fine particles] On the other hand, if the visible light transmittance Tv is large, the heat ray shielding may not be good, so the infrared shielding fine particles are dispersed and blended in the interlayer film so that the infrared rays contained in the solar radiation can enter the vehicle. It is preferable to prevent the light from entering. Examples of the material of the infrared ray shielding fine particles include Sn, Ti, Si, Zn, Zr, Fe, Al, Cr,
Co, Ce, In, Ni, Ag, Cu, Pt, Mn, T
Examples thereof include fine particles made of a metal such as a, W, V, and Mo, an oxide, a nitride, a sulfide, or a dopant obtained by doping these with Sb or F. These fine particles can be used alone or as a composite.

Further, the use of a mixture obtained by mixing these alone or a composite with an organic resin, or a coating obtained by coating the above alone or a composite with an organic resin has various effects on window glass for automobiles. It is effective for obtaining performance.

Further, as the infrared ray shielding fine particles, antimony-doped tin oxide (ATO) fine particles and / or tin-doped indium oxide (ITO).
It is preferable to use fine particles. ATO fine particles and I
Both TO fine particles have excellent infrared shielding performance, and a small amount of them may be added to the interlayer film. When comparing the ATO fine particles and the ITO fine particles, it is particularly preferable to use the ITO fine particles as the infrared shielding fine particles because the ITO fine particles have a better infrared shielding performance.

[Type of Glass Plate] One of the glass plates 1a and 1b is preferably made of soda lime silica glass containing a larger amount of iron than ordinary float glass. As the other glass plate, a glass plate having a visible light transmittance Tv calculated by the formula (1) of 87% is used.

By using the soda lime silica glass containing iron, the near infrared rays can be absorbed in the glass plate, and the infrared shielding performance can be maintained even if the amount of the infrared shielding fine particles added is small. Specifically, the Japanese Industrial Standards (JIS R31) of the glass plates 1a and 1b are used.
06-1998), and the content of iron is adjusted so that the product of the solar radiation transmittances obtained in accordance with (06-1998) is 0.3 to 0.6.

ITO fine particles are used as infrared ray shielding fine particles.
If used, 1c cut from laminated glass
m^TwoIncluded in each glass plate that makes up the laminated glass piece
Fe _TwoO_ThreeThe total sum of the converted total iron contents is 2 to 7 mg /
cm^Two(Preferably 3-6 mg / cm^Two)
Then, adjust the iron content. In this case, a piece of laminated glass
Fe contained in each glass plate of_TwoO_ThreeConverted FeO (2
Of total iron content) is 0.5-2.5 mg / cm
^TwoIs more preferable, and the temperature inside the vehicle is increased.
70 of the 1100 nm wavelength infrared light
% Or more can be shielded.

As a specific composition of the soda lime silica glass, a soda lime silica base glass containing 0.2 to 1% of total iron in terms of mass percentage expressed as Fe ₂ O ₃ is preferable. The absorption of near-infrared rays is predominantly due to the absorption of divalent iron out of total iron, and therefore Fe ₂ O ₃
The converted mass of divalent iron is preferably 20 to 40% of the mass of total iron converted to Fe ₂ O ₃ .

Since iron, FeO, ITO fine particles and the like are basically uniformly dispersed in the laminated glass, the laminated glass piece may be cut out at any position on the laminated glass.

[Characteristics of Laminated Glass Pieces] Here, the total content of divalent iron converted to Fe ₂ O ₃ contained in the glass plate of the laminated glass pieces is 0.5 to 2.5 mg / cm ² . The reason why is preferable is explained. In order for infrared communication through glass (for example, an optical beacon) to operate normally, infrared light having a wavelength of about 850 nm needs to sufficiently pass through the laminated glass. When the total content of Fe ₂ O ₃ -converted divalent iron contained in each glass plate constituting the laminated glass piece exceeds 2.5 mg / cm ² , the laminated glass shows infrared light with a wavelength of about 850 nm. Of that, 25% or more will be blocked.

On the contrary, when the total content of Fe ₂ O ₃ -converted divalent iron contained in each glass plate constituting the laminated glass piece is less than 0.5 mg / cm ² , the solar radiation transmittance of the laminated glass is In order to reduce the amount to 50% or less, it becomes necessary to add a large amount of infrared shielding fine particles, which increases the haze of the laminated glass. Therefore, the total content of Fe ₂ O ₃ -converted divalent iron contained in each glass plate of the laminated glass piece is preferably 0.5 to ^2.5 mg / cm ² .

Next, the reason why it is preferable to use ITO fine particles as the infrared ray shielding fine particles will be described. When the total amount of Fe ₂ O ₃ -converted divalent iron contained in each glass plate of the laminated glass piece is 0.5 to 2.5 mg / cm ² , inclusion of ITO fine particles contained in the interlayer film of the laminated glass piece The amount is preferably 0.1 to 0.5 mg / cm ² .

In order to reduce the haze of the interlayer film,
The proportion of the ITO fine particles dispersed and mixed in the interlayer film needs to be 0.1 to 0.5 parts by mass based on 100 parts by mass of the total mass of the interlayer film. Therefore, for example, the thickness of the interlayer film is 0.3 to
When it is in the range of 1.0 mm, the content of the ITO fine particles contained in the interlayer film of the laminated glass piece is about 0.0.
The range is 5 to 0.5 mg / cm ² .

However, in the interlayer film of the laminated glass piece containing ITO fine particles less than 0.1 mg, 1,100 nm was obtained.
There is a problem in that 90% or more of the infrared light of the wavelength is transmitted. Therefore, in order to sufficiently shield infrared light having a wavelength of 1,100 nm, it is preferable that the interlayer film of the laminated glass piece contains 0.1 mg or more of ITO fine particles, and the interlayer film of the laminated glass piece contains it. It can be said that the content of the ITO fine particles is most preferably 0.1 to 0.5 mg / cm ² .

FIG. 2 is a sectional view showing another embodiment of the present invention. As shown in the figure, the laminated glass 1 is formed by laminating three or more glass plates (outer plate 1a, inner plate 1b, middle plate 1d) and an intermediate film 1c. In the laminated glass 1 of this configuration, the visible light transmittance (visible light transmittance when converting the plate thickness to 5 mm) of at least one glass plate is 87.
% Or more, and any or all other glass plates or interlayers are colored.

Further, the above-mentioned infrared ray shielding fine particles may be dispersed and blended in the intermediate film 1c. In that case, the intermediate film 1c
Infrared shielding fine particles may be blended in at least one of the above, and may be blended in a plurality of sheets.

[0034]

As described above, according to the present invention, the plate thickness is 5
It includes a first glass plate having a visible light transmittance of 87% or more in terms of mm, and a colored second glass plate. Therefore, the first light source does not attenuate the light from the light source.
It is possible to guide the light into the glass and to emit light with sufficient brightness at its end. Further, by providing the colored laminated glass, the door glass can be colored, thereby preventing the inflow of heat energy of solar radiation into the vehicle interior and protecting the privacy inside the vehicle interior.

Further, by dispersing and blending the infrared shielding fine particles in the interlayer film, it is possible to prevent infrared rays contained in the solar radiation from entering the inside of the vehicle, which is particularly effective in preventing an increase in the temperature inside the vehicle.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1: laminated glass 1a: Glass plate (outer plate) 1b: Glass plate (inner plate) 1c: Intermediate film 1d: Glass plate (middle plate) 2: Light source

Claims (5)

[Claims] 1. A laminated glass in which a plurality of glass plates and an interlayer film provided between the glass plates are laminated, and the visible light transmittance by standard light D65 when the plate thickness is converted to 5 mm is 87. % Of the first glass plate,
A laminated glass comprising a colored second glass plate. 2. The laminated glass according to claim 1, which is a door glass for automobiles. 3. The laminated glass according to claim 1, wherein the intermediate film contains infrared ray shielding fine particles. 4. The laminated glass according to claim 3, wherein the infrared ray shielding fine particles are made of at least one selected from indium oxide doped with tin and tin oxide doped with antimony. 5. An edge light device comprising the laminated glass according to claim 1 and a light source for making light incident on an end portion of the first glass plate.