The present invention relates to a glass fusing method for manufacturing a glass fusing structure by fusing glass members together.
Known as a conventional glass fusing method in the above-mentioned technical field is one comprising burning a glass layer containing a laser-absorbing pigment onto one glass member along a region to be fused, then overlaying the other glass member on the former glass member such that the glass layer is interposed therebetween, and irradiating the region to be fused therealong with a laser beam, so as to fuse one glass member and the other glass member together.
Meanwhile, a typical technique for burning a glass layer onto a glass member is one removing an organic solvent and a binder from a paste layer containing a glass frit, a laser-absorbing pigment, the organic solvent and the binder, so as to fix the glass layer firmly to the glass member; and then heating the glass member having the glass layer firmly attached thereto in a firing furnace, so as to melt the glass layer, thereby burning the glass layer onto the glass member (see, for example, Patent Literature 1).
On the other hand, proposed from the viewpoint of suppressing the increase in energy consumption and burning time caused by the use of the firing furnace (i.e., the viewpoint of higher efficiency) is a technique which irradiates a glass layer firmly attached to a glass member with a laser beam, so as to melt the glass layer, thereby burning the glass layer onto the glass member (see, for example, Patent Literature 2).
Patent Literature 1: Japanese Translated International Patent Application Laid-Open No. 2006-524419
Patent Literature 2: Japanese Patent Application Laid-Open No. 2002-366050
However, when a glass layer is burned onto a glass member by irradiation with a laser beam, the glass member may incur damages such as cracks occurring therein at the time of burning or fusing of glass members thereafter.
In view of such circumstances, it is an object of the present invention to provide a glass fusing method which can efficiently fuse glass members by preventing the glass members from being damaged.
For achieving the above-mentioned object, the inventor conducted diligent studies and, as a result, has found out that the burning of the glass layer by irradiation with a laser beam leads to damages in the glass members because of the fact that the laser absorptance of the glass layer drastically increases when the temperature of the glass layer exceeds its melting point Tm at the time of burning as illustrated in
The glass fusing method in accordance with the present invention is a glass fusing method for manufacturing a glass fusing structure by fusing first and second glass members together, the method comprising the steps of disposing a glass layer on the first glass member along a region to be fused, the glass layer being formed by removing an organic solvent and a binder from a paste layer containing a glass powder, a laser-absorbing material, the organic solvent and the binder; irradiating the region to be fused therealong with a first laser beam having a first heat input, so as to melt the glass layer, switching the first heat input to a second heat input smaller than the first heat input when the melting ratio of the glass layer in a direction intersecting a moving direction of the first laser beam exceeds a predetermined level, and irradiating the region to be fused therealong with the first laser beam having the second heat input, so as to melt the glass layer, thereby fixing the glass layer to the first glass member; and overlaying the second glass member on the first glass member having the glass layer fixed thereto such that the glass layer is interposed therebetween, and irradiating the region to be fused therealong with a second laser beam, so as to fuse the first and second glass members together.
In this glass fusing method, when irradiating the region to be fused therealong with the first laser beam so as to melt the glass layer, the region to be fused is irradiated therealong with the first laser beam having the first heat input, so as to melt the glass layer, the heat input is switched when the melting ratio of the glass layer in a direction intersecting the moving direction of the first laser beam exceeds a predetermined level, and the region to be fused is irradiated therealong with the first laser beam having the second heat input smaller than the first heat input, so as to melt the glass layer, thereby the glass layer is fixed to the first glass member. Though the laser absorption of the glass layer drastically rises when the melting ratio of the glass layer exceeds a predetermined level at the time of fixing the glass layer, the first laser beam having the second heat input smaller than the first heat input is emitted thereafter, whereby the glass layer is deterred from falling into an excessive heat input state. Even when the glass layer is fixed to the first glass member by irradiation with the first laser beam, such switching of heat input can prevent glass members from incurring damages such as cracks occurring therein at the time of fixing the glass layer and fusing the glass members together thereafter. Therefore, this glass fusing method can efficiently fuse the glass members together by preventing the glass members from being damaged. Here, the “heat input” is the energy density of the first laser beam in its irradiation region. The “melting ratio of the glass layer” is the ratio of the width of the melted part of the glass layer to the whole width of the glass layer in a direction intersecting the moving direction of the first laser beam.
Preferably, in the glass fusing method in accordance with the present invention, the first heat input is switched to the second heat input by lowering the irradiation power of the first laser beam. In this case, since the heat input is changed by lowering the irradiation power, the first heat input can reliably be switched to the second heat input.
Preferably, in the glass fusing method in accordance with the present invention, the first heat input is switched to the second heat input by raising the moving speed of the first laser beam with respect to the glass layer. In this case, since the heat input is changed by raising the moving speed of the first laser beam with respect to the glass layer, the first heat input can reliably be switched to the second heat input. Also, since the switching is effected by raising the moving speed, the time required for fixing the glass layer can be shortened. Here, the “moving speed of the first laser beam with respect to the glass layer” means the relative moving speed of the first laser beam and encompasses each of the cases where the glass layer moves while the first laser beam is stationary, the first laser beam moves while the glass layer is stationary, and both of the laser beam and the glass layer move.
Preferably, in the glass fusing method in accordance with the present invention, the first heat input is switched to the second heat input when a predetermined time lapses from starting irradiation with the first laser beam. In this case, the first heat input can easily be switched to the second heat input by a simple method of controlling the predetermined time defined beforehand and the like. Since substantially the same predetermined time can be used for glass layers having the same structure as long as they are irradiated with the first laser beam under the same condition, a plurality of glass layers having the same structure can easily be melted continuously or simultaneously, which can improve the manufacturing efficiency.
Preferably, in the glass fusing method in accordance with the present invention, the first heat input is switched to the second heat input when the intensity of thermal radiation light radiating from the glass layer rises to a predetermined level. In this case, the heat input can accurately be switched upon detecting the intensity of the thermal radiation light that is related to the melting ratio of the glass layer such as to increase gradually as the latter rises.
Preferably, in the glass fusing method in accordance with the present invention, the first heat input is switched to the second heat input when the intensity of reflected light of the first laser beam reflected by the glass layer decreases to a predetermined level. In this case, the heat input can accurately be switched upon detecting the intensity of the reflected light that is related to the melting ratio of the glass layer such as to decrease gradually as the latter rises.
The present invention can efficiently fuse glass members together by preventing the glass members from being damaged.
In the following, preferred embodiments of the present invention will be explained in detail with reference to the drawings. In the drawings, the same or equivalent parts will be referred to with the same signs while omitting their overlapping descriptions.
The glass fusing method for manufacturing the above-mentioned glass fusing structure 1 will now be explained.
First, as illustrated in
Subsequently, the paste layer 6 is dried, so as to eliminate the organic solvent, and further heated, so as to remove the binder, thereby firmly attaching the glass layer 3 onto the surface 4a of the glass member 4 along the region to be fused R. Here, voids formed by the removal of the binder and the graininess of the glass frit 2 produce scattering of light exceeding the absorption characteristic of the laser-absorbing pigment, so that the glass layer 3 firmly attached to the surface 4a of the glass member 4 is in a low laser absorptance state (e.g., appears whiter under visible light).
Next, as illustrated in
Subsequently, as illustrated in
In the unstable region, the melting of the glass layer 3 does not extend over the whole width, so that the laser absorptance is not completely high. Therefore, as illustrated in
Heat input (J/mm2)=power density (J·S/mm2)/moving speed (S). (1)
Thereafter, when the stable region where the glass layer 3 is melted throughout the width is formed at the stable region initiation position B, the temperature of the glass layer 3 is at the melting point Tm or higher throughout the width, so that the glass fit melts to fill voids, while causing the glass layer 3 to lose the graininess, thus allowing the laser-absorbing pigment to exhibit its absorption characteristic remarkably, thereby drastically raising the laser absorptance of the glass layer 3 throughout the width and yielding the melting ratio of near 100% (e.g., appearing darker under visible light). This makes the glass layer 3 absorb the laser beam L1 more than expected, thereby inputting heat to the glass layer 3 in excess.
Therefore, as illustrated in
Thereafter, the irradiation of the glass layer 3 with the laser beam L1 is carried out with the irradiation power of 8 W, which is the second heat input, and continued along the region to be fused R until returning to the irradiation initiation position A, so as to complete burning. The laser irradiation may be performed in an overlapping manner such that the unstable region is irradiated with the laser beam L1 again so as to become a stable region as necessary.
Burning the glass layer 3 while performing such control as to switch the heat input melts and resolidifies the glass layer 3 disposed between the glass member 4 and the mount table 7 while inhibiting it from crystallizing. Since the burning is effected by irradiation with the laser beam L1 from the glass member 4 side in this embodiment, the glass layer 3 is reliably fixed to the glass member 4, while the surface 3a of the glass layer 3, which becomes a fusing surface when fusing the glass members 4, 5 together, is further deterred from crystallizing. The glass layer 3 burned onto the surface 4a of the glass member 4 loses the graininess as the glass frit 2 melts to fill voids, so as to allow the laser-absorbing pigment to exhibit its absorption characteristic remarkably, thereby attaining a high laser absorptance state (e.g., appearing darker under visible light).
When the burning of the glass layer 3 inhibited from crystallizing throughout the region to be fused is completed, the glass member 4 having the glass layer 3 burned thereonto is removed from the mount table 7. Here, the difference between the coefficients of linear expansion of the glass frit 2 and thermal conductor 7 is greater than the difference between the coefficients of linear expansion of the glass frit 2 and glass member 4, whereby the glass layer 3 does not firmly attach to the surface 7a of the mount table 7. Since the surface 7a of the mount table 7 is polished, the glass layer 3 burned onto the surface 4a of the glass member 4 is in a state where irregularities on the surface 3a on the side opposite from the glass member 4 are made flat.
Subsequent to the burning of the glass layer 3, as illustrated in
Then, as illustrated in
As explained in the foregoing, when melting the glass layer 3 by irradiating the region to be fused R therealong with the laser beam L1, the glass fusing method for manufacturing the glass fusing structure 1 irradiates the region to be fused R therealong with the laser beam L1 having the first heat input, so as to melt the glass layer 3, switches the heat input when the melting ratio of the glass layer 3 in a direction substantially orthogonal to the moving direction of the laser beam L1 becomes near 100%, and irradiates the region to be fused R therealong with the first laser beam having the second heat input smaller than the first heat input, so as to melt the glass layer 3 and fix the glass layer 3 to the first glass member 4. Though the laser absorptance of the glass layer 3 rises drastically when the melting ratio of the glass layer 3 reaches near 100% at the time of fixing the glass layer 3, the laser light L1 having the second heat input smaller than the first heat input is emitted thereafter, whereby the glass layer 3 is inhibited from falling into an excessive heat input state. Even when the glass layer 3 is fixed to the glass member 4 by irradiation with the laser beam L1, such switching of heat input can prevent the glass members 4, 5 from incurring damages such as cracks occurring therein at the time of fixing the glass layer 3 and fusing the glass members 4, 5 together thereafter. Therefore, this glass fusing method can efficiently fuse the glass members 4, 5 together by preventing the glass members 4, 5 from being damaged.
The above-mentioned glass fusing method switches the first heat input to the second heat input by lowering the irradiation power of the laser beam L1. Since the heat input is thus switched by lowering the irradiation power, the first heat input can reliably be switched to the second heat input.
In the above-mentioned glass fusing method, the melting ratio becomes near 100% after the lapse of the predetermined time X from starting irradiation with the laser beam L1, and then the first heat input is switched to the second heat input. Therefore, the first heat input can easily be switched to the second heat input by a simple method of controlling the predetermined time X defined beforehand and required for the melting ratio to become near 100%. Since substantially the same predetermined time X can be used for glass layers having the same structure as long as they are irradiated with the laser beam L1 under the same condition, glass layers 3 having the same structure can easily be melted continuously or simultaneously, which can improve the manufacturing efficiency during making a plurality of glass fusing structures 1.
Meanwhile, organic EL packages and the like have a small size themselves, for which thinner glass members 4, 5 are used, so that low expansion glass is often chosen as a material for the glass members 4, 5 in order to make them harder to break. Here, in order for the glass layer 3 to have a coefficient of linear expansion matching that of the glass members 4, 5 (i.e., in order to lower the coefficient of linear expansion of the glass layer 3), the glass layer 3 is made to contain a large amount of a filler constituted by ceramics or the like. By containing the large amount of the filler, the glass layer 3 changes its laser absorptance greatly between before and after irradiation with the laser beam L1. Therefore, the above-mentioned glass fusing method is effective in particular when low expansion glass is chosen as the material for the glass members 4, 5.
The present invention is not limited to the above-mentioned embodiment.
For example, though the above-mentioned embodiment switches from the first heat input to the second heat input when the melting ratio becomes near 100% after the lapse of the predetermined time X from the irradiation initiation position A for the laser beam L1, the first heat input may be switched to the second heat input when the intensity of thermal radiation light radiating from the glass layer 3 rises to a predetermined level Q as illustrated in
Though the above-mentioned embodiment controls the heat input to the glass layer 3 by changing the irradiation power of the laser beam L1, the relative irradiation speed of the laser beam L1 (i.e., the moving speed of the laser beam L1 with respect to the glass layer 3) may be raised while keeping the irradiation power of the laser beam L1 constant as illustrated in the above-mentioned expression (1), so as to switch the heat input to the glass layer 3. In this case, since the heat input is changed by raising the moving speed of the laser beam L1, the first heat input can reliably be switched to the second heat input. Also, since the switching is effected by raising the moving speed, the time required for fixing the glass layer 3 can be shortened. Here, since switching the heat input by raising the moving speed often includes a speed acceleration step, it will be preferred from the viewpoint of inhibiting the glass layer 3 from crystallizing if the switching control for the moving speed is started before the timing for switching arrives (the lapse of the predetermined time X or the intensity of heat radiation light or reflected light becomes a predetermined level) and has completed at the timing for actual switching.
Though the above-mentioned embodiment moves the laser beams L1, L2 with respect to the secured glass members 4, 5, it is sufficient for the laser beams L1, L2 to move relative to the glass members 4, 5. The glass members 4, 5 may be moved while securing the laser beams L1, L2, or each of the glass members 4, 5 and the laser beams L1, L2 may be moved.
Though the above-mentioned embodiment switches the heat input at a predetermined level of the melting ratio such as 100%, the heat input may be switched at a predetermined level of the melting ratio such as 90%, for example, if the glass layer is melted appropriately, so as to reliably inhibit the glass layer 3 from crystallizing.
Though the above-mentioned embodiment irradiates the glass layer 3 with the laser beam L1 through the glass member 4, the glass layer 3 may directly be irradiated with the laser beam L1.
The present invention can efficiently fuse glass members together by preventing the glass members from being damaged.
1 . . . glass fusing structure; 2 . . . glass frit (glass powder); 3 . . . glass layer; 4 . . . glass member (first glass member); 5 . . . glass member (second glass member); 6 . . . paste layer; 7 . . . mount table; A . . . irradiation initiation position; B . . . stable region initiation position; R . . . region to be fused; L1 . . . laser beam (first laser beam); L2 . . . laser beam (second laser beam)
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