JP5583268B2 - Coating apparatus and coating method - Google Patents

Description

  Embodiments described herein relate generally to a coating apparatus and a coating method.

  When a coating film is formed on the inner surface of a three-dimensional object to be coated, generally, brush coating, spray coating, dip coating, or the like is used. In the case of the spray coating method, in order to apply uniformly, it is necessary to apply the spray nozzle away from several cm to several tens of cm from the application target surface. However, when the object to be applied is smaller than the above-described distance, uniform application to the inner surface becomes difficult. Further, in the dip coating method, it is necessary to discharge a large amount of coating liquid into an object to be applied and adhere to the inner surface, and then discharge unnecessary coating liquid, resulting in low material utilization efficiency and high production cost. Moreover, when applying a high viscosity coating liquid by the dip coating method, it takes time to discharge the unnecessary coating liquid because the flow rate is low.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a coating apparatus capable of efficiently coating a coating liquid on the inner surface of a three-dimensional coating object. Moreover, an object of this invention is to provide the coating method which can apply | coat a coating liquid efficiently to the inner surface of a three-dimensional application | coating object using such a coating device.

The coating apparatus according to the embodiment relates to a coating apparatus that applies a coating liquid to an inner surface of a coating target having a space inside. The coating apparatus of the embodiment includes a holding mechanism, a first mechanism, and a second mechanism. The holding mechanism holds the application object. The first mechanism rotates the application object around a first rotation axis that passes through the inside of the application object. The second mechanism rotates the application object one or more times around the second rotation axis that intersects the first rotation axis. The distance from the intersection of the first rotation axis and the second rotation axis to the inner surface of the bottom of the application target is 0 to 90 mm. The application object is a light emitting device, and the coating liquid contains a phosphor.

The coating method of the embodiment relates to a coating method in which a coating liquid is applied to the inner surface of an object to be coated using the coating apparatus of the above-described embodiment. The coating method of the embodiment has a first step and a second step in order. In the first step, the application object is rotated around the first rotation axis without rotating the application object around the second rotation axis. In the second step, the application object is rotated around the second rotation axis while the application object is rotated around the first rotation axis. The distance from the intersection of the first rotation axis and the second rotation axis to the inner surface of the bottom of the application target is 0 to 90 mm. The application object is a light emitting device, and the coating liquid contains a phosphor.

Sectional drawing which shows an example of the coating device of embodiment. Sectional drawing which shows the inside of a coating target object. Explanatory drawing explaining the centrifugal force in a coating liquid. Sectional drawing which shows the coating device which has an injection nozzle. Sectional drawing which shows the coating device which has a heating apparatus. The figure which shows the coating device which has a rotational speed control mechanism. Sectional drawing which shows the modification of the coating device of embodiment. The figure which shows an example of an application result. The figure which shows the other example of an application result. The figure which shows the relationship between the viscosity of a coating liquid, and the average film thickness of a coating film. The figure which shows the relationship between the revolution speed at the time of a self-revolution, and the average film thickness of a coating film. The figure which shows the relationship between the rotation time at the time of self-revolution, and the average film thickness of a coating film.

  Hereinafter, the coating apparatus and the coating method of the embodiment will be described in detail.

  The coating apparatus according to the embodiment relates to a coating apparatus that applies a coating liquid to an inner surface of a coating target having a space inside. The coating apparatus of the embodiment includes a holding mechanism, a first mechanism, and a second mechanism. The holding mechanism holds the application object. The first mechanism rotates the application object around a first rotation axis that passes through the inside of the application object. The second mechanism rotates the application target around a second rotation axis that intersects the first rotation axis. According to the application apparatus of the embodiment, the application liquid can be efficiently applied to the inner surface of the three-dimensional application object by rotating the application object around two different rotation axes.

  The coating method of the embodiment relates to a coating method in which a coating liquid is applied to the inner surface of an object to be coated using the coating apparatus of the above-described embodiment. The coating method of the embodiment has a first step and a second step in order. In the first step, the application object is rotated around the first rotation axis without rotating the application object around the second rotation axis. In the second step, the application object is rotated around the second rotation axis while the application object is rotated around the first rotation axis. According to the coating method of the embodiment, while using the above-described coating apparatus, only rotation around the first rotation axis is performed in the first step, and then rotation around the first rotation axis and second rotation are performed. By simultaneously performing the rotation around the rotation axis, the coating liquid can be efficiently applied to the inner surface of the three-dimensional application object.

  FIG. 1 is a cross-sectional view illustrating an example of a coating apparatus according to an embodiment. The coating device 1 is used to apply a coating liquid to the inner surface of the coating object 2. A coating apparatus 1 shown in FIG. 1 is mainly composed of a holding unit 3, a rotation rotating machine 4, and a revolution rotating machine 5.

  For example, as shown in FIG. 2, the application object 2 is a substantially hemispherical object having a space inside, and a circular opening 21, and an annular shape provided on the outer peripheral part one step down from the opening 21. It has a flat portion 22 and a bottom portion 23 provided on the opposite side of the opening 21. The application object 2 is not necessarily limited to a substantially hemispherical shape, and may be, for example, a substantially spherical shape or a substantially cylindrical shape, and the shape thereof is not particularly limited.

  As such an application target object 2, for example, a lighting device, in particular, a cover that covers the light emitting portion, and the like are preferable, but the application target object 2 is not necessarily limited to the cover of the lighting device. Examples of the coating liquid include luminescent paints and fluorescent paints applied to the inner surface of the cover in the lighting device, but are not necessarily limited to these luminescent paints and fluorescent paints.

  The revolution rotating machine 5 mainly constitutes a second mechanism that rotates the application target object 2 around a second rotation axis R2 that intersects the first rotation axis R1. In the following, the rotation of the application object 2 around the second rotation axis R2 is referred to as revolution. The revolution rotating machine 5 is composed of, for example, a motor or the like. The rotating machine body 51 is fixedly arranged, and extends upward from the rotating machine body 51 and rotates with respect to the rotating machine body 51. Rotating shaft 52. The rotating shaft 52 and its extension line correspond to the second rotating shaft R2.

  The rotating machine 4 for rotation constitutes a first mechanism that rotates the application object 2 around the first rotation axis R1 that passes through the inside of the application object 2. In addition, the rotating machine 4 for rotation also comprises a part of 2nd mechanism which rotates the coating target object 2 centering on 2nd rotating shaft R2. Hereinafter, the rotation of the application object 2 around the first rotation axis R1 is referred to as rotation. The rotating machine 4 for rotation is fixed to the rotating shaft 52 of the rotating machine 5 for revolution through a connecting member 6.

  The connecting member 6 constitutes a part of a second mechanism that rotates the application target 2 around the second rotation axis R2, and is, for example, a substantially plate-shaped member, and includes a horizontal portion 61, It is comprised from the inclination part 62 which inclines upwards at the edge part of this horizontal part 61, and is provided. The connecting member 6 is fixed by inserting the rotating shaft 52 of the revolving rotating machine 5 into a revolving machine fixing hole 61 a provided in the horizontal portion 61. In addition, the rotating machine 4 for rotation is inserted into and fixed to the connection member 6 in a fixing hole 62 a for rotation machine provided in the inclined portion 62.

  The rotating machine 4 for rotation is composed of, for example, a motor or the like. The rotating machine body 41 is fixedly disposed on the connection member 6 and is extended from the rotating machine body 41 so as to rotate with respect to the rotating machine body 41. And a rotating shaft 42. The rotating shaft 42 and its extension line correspond to the first rotating shaft R1.

  The angle θ formed by the rotating shaft 42 (first rotating shaft R1) of the rotating rotating machine 4 and the rotating shaft 52 (second rotating shaft R2) of the rotating rotating machine 5 is, for example, 45 degrees. It is not necessarily limited to such an angle, and can be appropriately changed within a range of more than 0 degree and 90 degrees or less. Adjustment of angle (theta) can be performed by adjusting the inclination-angle of the inclination part 62 in the connection member 6, for example.

  The holding unit 3 constitutes a holding mechanism that holds the application object 2. The holding unit 3 includes, for example, a holding unit main body 31 that holds the bottom 23 side of the application target object 2 and a holding cover 32 that holds the application target object 2 on the holding unit main body 31.

  The holding part main body 31 includes, for example, a disk-shaped rotating machine fixing part 31a and a holding part 31b including a cylindrical part fixed on the rotating machine fixing part 31a. The rotating machine fixing part 31a is fixed by inserting the rotating shaft 42 of the rotating machine 4 for rotation into a fixing hole 31c for the rotating machine provided at the center thereof.

  The holding cover 32 has, for example, a cylindrical shape, and has an opening hole portion 32 a into which the opening portion 21 of the application target object 2 is inserted at one end portion, and the other end portion is a rotation machine of the holding portion main body 31. It is extended so that the fixed part 31a may be reached. According to such a holding cover 32, by covering the application target object 2, the application target object 2 can be held by pressing the flat portion 22 of the application target object 2 by the outer peripheral portion of the opening hole portion 32 a. . The holding cover 32 can be fixed, for example, by tightening the bottom of the holding cover 32 in the thickness direction with a screw portion 33 provided on the rotating machine fixing portion 31a of the holding portion main body 31.

According to such a coating apparatus 1, for example, as shown in FIG. 2, by rotating the rotation shaft 42 of the rotation rotating machine 4, the application target object 2 is rotated about the first rotation axis R <b> 1 (autorotation). ). Further, by rotating the rotating shaft 52 of the revolving rotating machine 5, the application object 2 can be rotated (revolved) around the second rotating shaft R2. Thus, for example, as shown in the following formula and FIG. 3, the resultant force F _total (= F _rot + F _rev ) of the centrifugal force (F _rot ) due to rotation and the centrifugal force (F _rev ) due to revolution is added to the coating liquid 7. The coating liquid 7 can be applied not only to the bottom 23 of the application object 2 but also to the inner surface of the opening 21. 2 and 3 both show the coating apparatus 1 as viewed from above.

Formula 1

  The angle θ formed by the rotating shaft 42 (first rotating shaft R1) of the rotating rotating machine 4 and the rotating shaft 52 (second rotating shaft R2) of the rotating rotating machine 5 is preferably 10 to 90 degrees, for example. 20-80 degrees is more preferable. By setting the angle θ to 10 degrees or more, the coating liquid 7 can be easily applied to the inner surface of the opening 21 in the coating object 2. Moreover, application of the coating liquid 7 to the inner surface of the bottom 23 is facilitated by setting it to 90 degrees or less.

  The position of the application target object 2 on the rotating shaft 42 (first rotating shaft R1) of the rotating machine 4 for rotation is not necessarily limited. For example, the intersection of the first rotating shaft R1 and the second rotating shaft R2 It is preferable that the distance from the inner surface of the bottom part 23 of the application | coating target object 2 is 0-90 mm, and it is more preferable that it is 0-10 mm. If the distance is 90 mm, the coating liquid 7 can be sufficiently applied to the inner surface of the application object 2, and an increase in the size and stability of the coating apparatus 1 can be suppressed.

  In addition, it is preferable that the application target 2 normally does not overlap the second rotation axis R2, that is, the opening 21 and the bottom 23 are on the same side with respect to the second rotation axis R2. It is preferable that the opening 21 and the bottom 23 are positioned on the rotation axis R1 and that the bottom 23 side is the second rotation axis R2 side.

  The coating apparatus 1 is preferably provided with a coating liquid supply mechanism for injecting the coating liquid 7 into the coating target 2. Examples of the coating liquid supply mechanism include an injection nozzle 11 that injects the coating liquid 7 into the opening 21 of the application target 2 as shown in FIG. By providing the coating liquid supply mechanism, the operation of injecting the coating liquid 7 into the application object 2 can be made efficient, and the application operation can be made efficient.

  Further, depending on the composition of the coating liquid 7, such as when the coating liquid 7 contains a thermosetting resin, a heat treatment or an ultraviolet irradiation process for curing the coating liquid 7 after application may be necessary. For this reason, it is preferable to provide the coating device 1 with a heating device 12 that covers the holding unit 3 as shown in FIG. As the heating device 12, for example, a device in which a heater 12b is provided on the entire inner surface of a bottomed cylindrical device main body 12a can be mentioned, but it is not necessarily limited to such a device.

  Further, in the application of the coating liquid 7 using the coating apparatus 1, only the rotation shaft 42 of the rotation rotating machine 4 is rotated to rotate only the object 2 to be rotated, as will be described later, and then the rotation rotating machine. It is preferable to simultaneously rotate and revolve the coating object 2 by simultaneously rotating the rotation shaft 42 of the fourth rotation shaft 52 and the rotation shaft 52 of the revolving rotating machine 5. Therefore, in the coating apparatus 1, for example, as shown in FIG. 6, the rotation for controlling one or both of the rotational speed of the rotating shaft 42 in the rotating rotating machine 4 and the rotating speed of the rotating shaft 52 in the rotating rotating machine 5 is controlled. A speed control mechanism 13 is preferably provided.

  FIG. 7 is a cross-sectional view showing a modification of the coating apparatus 1. The coating apparatus 1 is not necessarily limited to the one that applies the coating liquid 7 to one application target 2, and may be one that applies the coating liquid 7 to two or more application targets 2 at the same time. The coating apparatus 1 of the modification uses a substantially cylindrical one as the connecting member 6 so that the two rotating machines 4 can be fixed.

  The rotation rotating machine 4 and the revolution rotating machine 5 in the coating apparatus 1 can be substantially the same as the rotation rotating machine 4 and the revolution rotating machine 5 in the coating apparatus 1 shown in FIG. The connecting member 6 includes a cylindrical tube main body 63, a diameter reducing portion 64 provided above the tube main body 63 and gradually reducing the diameter, and a bottom 65 provided at a lower portion of the tube main body 63. The rotating shaft 52 of the revolving rotating machine 5 is inserted and fixed in the revolving machine fixing hole 65a provided in the bottom 65. The rotating machine 4 for rotation is inserted and fixed in the two fixing holes 64a for the rotating machine provided in the reduced diameter portion 64, respectively.

  The number of the rotating machines 4 to be fixed to the connecting member 6 is not necessarily limited to two. For example, three or more rotating machine fixing holes 64a are provided, and the rotating machines 4 are inserted and fixed in each. May be. When two or more rotating machines 4 for rotation are provided, it is preferable to arrange them at equal intervals in the circumferential direction. The angle θ formed by the rotating shaft 42 (first rotating shaft R1) of the rotating rotating machine 4 and the rotating shaft 52 (second rotating shaft R2) of the rotating rotating machine 5 is, for example, the inclination of the reduced diameter portion 64. This can be done by adjusting the corners.

  The angle θ formed by the rotating shaft 42 (first rotating shaft R1) of the rotating rotating machine 4 and the rotating shaft 52 (second rotating shaft R2) of the rotating rotating machine 5 is, for example, 45 degrees. It is not necessarily limited to such an angle, and can be appropriately changed within a range of more than 0 degree and 90 degrees or less. For example, the angle θ is preferably 10 to 90 degrees, and more preferably 20 to 80 degrees.

  The position of the application target object 2 on the rotating shaft 42 (first rotating shaft R1) of the rotating machine 4 for rotation is not necessarily limited. For example, the intersection of the first rotating shaft R1 and the second rotating shaft R2 If the distance from the inner surface of the application object 2 to the inner surface of the bottom 23 is about 90 mm, the coating liquid 7 can be sufficiently applied to the inner surface of the application object 2, and the application apparatus 1 is increased in size and stability is reduced. Can also be suppressed. Also in this coating apparatus 1, the coating object 2 is arranged such that the opening 21 and the bottom 23 are located on the first rotation axis R1, and the bottom 23 side is the second rotation axis R2 side. It is preferred that

  Also for the coating apparatus 1, the coating liquid supply mechanism for injecting the coating liquid 7 into the coating object 2, the heating device 12 for curing the coating liquid 7, and the rotation of the rotating shaft 42 in the rotating rotating machine 4. It is preferable to provide a rotation speed control mechanism 13 or the like that controls one or both of the speed and the rotation speed of the rotating shaft 52 in the revolution rotating machine 5.

  As described above, the application apparatus 1 according to the embodiment has been described by way of example. However, the connecting member 6 does not necessarily need to be directly connected to the revolving rotating machine 5 (rotating shaft 52) and rotate. For example, in the coating apparatus 1 shown in FIG. 1, a rotation auxiliary member on a circular plate is fixed to the lower part of the connection member 6, and a shaft portion and this instead of the revolving rotating machine 5 (rotating shaft 52) are centered on these members. A bearing (revolution bearing) comprising a bearing for supporting the rotation is arranged, and instead a revolution rotating machine 5 (rotating shaft 52) is arranged in the vicinity of the outer peripheral portion of the rotation auxiliary member, and this revolution rotating machine 5 (rotating shaft) 52) may be directly or indirectly brought into contact with the vicinity of the outer peripheral portion of the rotation assisting member, and the connecting member 6 may be rotated via the rotation assisting member.

  Further, the holding unit 3 is not necessarily required to rotate with the rotating machine 4 for rotation. For example, in the case having the above-described rotation assisting member, a bearing (rotating bearing) including a shaft portion and a bearing supporting the shaft portion is connected to the holding portion 3 instead of the rotation device 51, and instead of a revolving bearing. The rotating shaft 42 of the rotating rotating machine 4 is used as the shaft section, and the shaft section of the revolving bearing (the rotating shaft 42 of the rotating rotating machine 4) and the shaft section of the rotating bearing approach each other, for example, the first rotation. A bevel gear is provided in the shaft portion of the rotating bearing and the shaft portion of the revolving bearing (the rotating shaft 42 of the rotating rotating machine 4) in the vicinity where the shaft R1 and the second rotating shaft R2 intersect with each other. Thus, the holding unit 3 may be indirectly rotated by the shaft portion of the revolving bearing (the rotating shaft 42 of the rotating rotating machine 4).

  Next, the coating method of the embodiment will be described. The coating method of the embodiment uses the above-described coating apparatus 1 and sequentially performs the following first and second steps. In the first step, the rotation (revolution) of the application object 2 around the first rotation axis R1 is performed without the rotation (revolution) of the application object 2 around the second rotation axis R2. Do. In the second step, the application object 2 is rotated (revolved) around the second rotation axis R2 while the application object 2 is rotated (rotated) around the first rotation axis R1. . Hereinafter, the coating method of the embodiment will be specifically described.

  First, the coating liquid 7 is injected into the application target 2. The coating liquid 7 is injected, for example, by using an injection nozzle 11 as shown in FIG. The injection amount of the coating liquid 7 is not particularly limited as long as it is an amount that can be applied to the entire inner surface of the coating object 2, and the composition of the coating liquid 7 and the desired thickness of the coating film are taken into consideration. Can be selected as appropriate.

  After injecting the coating liquid 7, only the rotating shaft 42 of the rotating rotating machine 4 is rotated to rotate (spin) the application object 2 (first process). By performing only the rotation of the application object 2 without performing the revolution of the application object 2, the coating liquid 7 can be efficiently applied to the bottom 23 of the application object 2 and the vicinity thereof.

  The rotation speed of the rotating machine 4 for rotation (rotating shaft 42) can be appropriately selected depending on the shape and size of the coating object 2, the viscosity of the coating liquid 7, the desired thickness of the coating film, and the like.

  The rotation time can also be appropriately selected depending on the shape and size of the application object 2, the viscosity of the coating liquid 7, the desired thickness of the coating film, and the like.

  After coating the coating liquid 7 on the bottom 23, the rotating shaft 52 of the rotating rotating machine 4 is rotated while the rotating shaft 52 of the rotating rotating machine 4 is rotated to rotate the application object 2 (spinning and revolving, (Hereinafter also referred to as self-revolution) (second step). By simultaneously rotating and revolving the application target object 2, the coating liquid 7 can be applied to the side surface and the inner surface of the opening 21.

  The rotational speed of the rotating machine 4 (rotating shaft 42) and the rotating machine 5 (rotating shaft 52) depends on the shape and size of the coating object 2, the viscosity of the coating liquid 7, and the desired coating thickness. It can be appropriately selected depending on the above.

  Regarding the rotation time of the rotating machine 4 for rotation (rotating shaft 42) and the rotating machine 5 for rotation (rotating shaft 52), the shape and size of the object 2 to be applied, the viscosity of the coating liquid 7, and the desired coating thickness It can be appropriately selected depending on the size.

  After coating the coating liquid 7 on the inner surface of the coating object 2, for example, the coating liquid 7 is naturally dried. For example, when the coating liquid 7 contains a thermosetting resin or an ultraviolet curable resin, heat treatment or ultraviolet irradiation is performed. By carrying out, the coating liquid 7 can be hardened and a film can be formed in the inner surface of the application target object 2. FIG. For example, the heat treatment can be performed using a heating device 12 as shown in FIG.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to examples.

Example 1
A coating film was formed on the inner surface of the coating object 2 using the coating apparatus 1 shown in FIG. For the object 2 to be applied, a substantially hemispherical product made of polycarbonate (inner length (length in the first rotation axis R1 direction) 50 mm, inner diameter (maximum diameter) 60 mm, inner diameter (opening) 45 mm) is used. As the coating liquid 7, a dispersion of a phosphor in a thermosetting silicone resin (solid content concentration 80 mass%, viscosity 100 [Pa · s]) was used.

  In the coating apparatus 1, the distance from the intersection of the first rotation axis R1 and the second rotation axis R2 to the inner surface of the bottom 23 of the coating object 2 was set to 0 mm. The application condition was that the coating liquid 7 was dropped (8 ml) inside the application object 2 and then only 600 rpm rotation was performed for 5 seconds, followed by 200 rpm rotation and 600 rpm revolution simultaneously for 60 seconds. The results are shown in Table 1.

(Comparative Example 1)
A coating film was formed on the inner surface of the coating object 2 in the same manner as in Example 1 except that only rotation at 600 rpm was performed for 5 seconds and then rotation at 200 rpm and revolution at 600 rpm were not performed. The results are shown in Table 1.

(Comparative Example 2)
A coating film was formed on the inner surface of the coating object 2 in the same manner as in Example 1 except that only 600 rpm rotation was performed for 5 seconds and then only 600 rpm revolution was performed without rotation. The results are shown in Table 1.

  After performing only rotation, according to the method of Comparative Example 1 in which rotation was not performed, the coating liquid 7 could not be applied up to the opening 21 of the application object 2, and after performing only rotation, It can be seen that uneven application of the coating liquid 7 also occurs in Comparative Example 2 in which only revolution was performed without rotation. On the other hand, according to the method of Example 1 in which the autorotation was performed after only the autorotation, it was found that the coating liquid 7 could be applied up to the opening 21 of the application object 2 and the application unevenness could be suppressed.

(Example 2)
As a coating object 2, a drinking water bottle (PET bottle having a capacity of 350 ml) and a resin spherical member (inner diameter 60 mm) having a space inside were used, and a coating film was formed on the inner surface thereof. The coating apparatus 1 and the coating liquid 7 were substantially the same as those used in Example 1. About the bottle for drinking water, after dripping the coating liquid 7 inside, after performing only 600 rpm autorotation for 10 seconds, the autorotation of 255 rpm and the revolution of 850 rpm were simultaneously performed for 180 seconds. For the spherical member, after coating solution 7 was dropped inside, only rotation at 600 rpm was performed for 10 seconds, and then rotation at 255 rpm and revolution at 850 rpm were simultaneously performed for 120 seconds. 8 and 9 show the results of experimentally emitting light on the coating object 2 on which the coating film (phosphor layer) was formed. As is apparent from FIGS. 8 and 9, it can be seen that the coating film can be satisfactorily formed even when the coating object 2 is cylindrical or spherical.

(Example 3, Comparative Example 3)
The difference in application time and material utilization efficiency by the application method was evaluated. That is, as the coating object 2 and the coating liquid 7, the same coating object 2 and the coating liquid 7 used in Example 1 are used, coating using the coating apparatus 1 (Example 3), and dip coating method. Application (Comparative Example 3) was performed, and the time from application start to application end (application time) and material utilization efficiency were determined.

  Application by the coating apparatus 1 was performed by dropping the coating liquid 7 into the inside of the coating object 2 (8 ml), performing only 600 rpm rotation for 5 seconds, and then simultaneously performing 255 rpm rotation and 850 rpm revolution for 60 seconds. In addition, the application by dip coating is an operation in which the coating liquid 7 is dropped (6.4 ml) inside the coating object 2 and then the coating liquid 7 is adhered inside the coating object 2 and the unnecessary coating liquid 7 is discharged. Was repeated three times, and the time until the discharge of the unnecessary coating liquid 7 finally stopped was defined as the coating time. In addition, the material utilization efficiency was defined as the ratio of the amount of the coating liquid 7 attached to the coating object 2 with respect to the amount of the coating liquid 7 used (the total amount of the coating liquid 7). The results are shown in Table 2.

Example 4
The average film thickness of the coating film with respect to the viscosity of the coating liquid 7 was measured.
That is, as the coating apparatus 1 and the coating object 2, the same coating apparatus 1 and coating object 2 used in Example 1 were used, and the viscosity of the coating liquid 7 was changed to form a coating film. The film thickness was measured. The coating conditions were such that after the coating liquid 7 was dropped inside the coating object 2, only 600 rpm rotation was performed for 5 seconds, and then 255 rpm rotation and 850 rpm revolution were simultaneously performed for 60 seconds. The results are shown in FIG.

As shown in FIG. 10, it can be seen that the average film thickness increases as the viscosity increases. This is because the fluidity decreases as the viscosity increases, and it becomes difficult to stretch under the same centrifugal force. In addition, the continuous line of FIG. 10 represents the regression equation represented by the following formula (the same applies to FIGS. 11 and 12).
T = 955.34 · η _∞ ^0.405 · ω ^−0.378 · t ^−0.165
t: Revolution time [sec]
ω: Revolution speed [rpm]
η _∞ : Residual viscosity [Pa · s]
(Viscosity at shear rate ∞. Obtained from Casson equation)
T: Average film thickness [μm]

(Example 5)
The average film thickness of the coating film was measured with respect to the rotation speed of the revolution during the revolution. That is, as the coating apparatus 1 and the coating object 2, the same coating apparatus 1 and coating object 2 used in Example 1 were used, and the coating liquid 7 was dropped inside the coating object 2 to rotate at 600 rpm. After performing only for 5 seconds, the rotation speed of rotation was fixed at 255 rpm, the rotation speed of revolution was changed, application was performed for 60 seconds to form a coating film, and the average film thickness was measured. The viscosity of the coating liquid 7 was 16.5, 40.5, and 60.3 [Pa · s]. The results are shown in FIG.

  As is apparent from FIG. 11, regardless of the viscosity of the coating liquid 7, the average film thickness decreases as the rotational speed of revolution at the time of self-revolution increases. This is because the centrifugal force increases as the rotational speed increases, and the coating liquid 7 is stretched toward the opening 21 side of the application target 2.

(Example 6)
The average film thickness of the coating film was measured with respect to the rotation time during rotation.
That is, as the coating apparatus 1 and the coating object 2, the same coating apparatus 1 and coating object 2 used in Example 1 were used, and the coating liquid 7 was dropped inside the coating object 2 to rotate at 600 rpm. After only performing for 5 seconds, the rotation time was changed, and rotation at 255 rpm and revolution at 850 rpm were simultaneously performed to form a coating film, and the average film thickness was measured. The viscosity of the coating liquid 7 was 40.5 [Pa · s]. The results are shown in FIG.

  As is apparent from FIG. 12, the average film thickness of the coating film decreases as the rotation time during the self-revolution increases. This is because as the rotation time increases, a larger amount of the coating liquid 7 is shaken out of the application target 2.

  As is apparent from the results of Examples 3 to 5, it can be seen that the film thickness of the coating film changes depending on the viscosity of the coating liquid 7, the rotation speed and time. That is, it can be seen that a coating film having a desired film thickness can be obtained by appropriately adjusting the viscosity of the coating liquid 7 and the speed and time during rotation.

  As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Application | coating apparatus, 2 ... Application | coating object (21 ... Opening part, 22 ... Flat part, 23 ... Bottom part) 3 ... Holding part (31 ... Holding part main body, 32 ... Holding cover), 4 ... Rotating machine for rotation, 5: Revolving rotating machine, R1: First rotating shaft, R2: Second rotating shaft

Claims (8)

A coating apparatus for coating a coating liquid on the inner surface of a coating object having a space inside,
A holding mechanism for holding the application object;
A first mechanism for rotating the application object about a first rotation axis passing through the inside of the application object;
A second mechanism that rotates the application object one or more times around a second rotation axis that intersects the first rotation axis ;
The distance from the intersection of the first rotation axis and the second rotation axis to the inner surface of the bottom of the application object is 0 to 90 mm, the application object is a light emitting device, and the coating liquid is fluorescent An applicator comprising a body .   2. The second rotating shaft is extended in a substantially vertical direction, and an angle formed by the first rotating shaft and the second rotating shaft is more than 0 degree and less than 90 degrees. The coating apparatus as described. The application object has an opening and a bottom facing the opening,
The holding mechanism holds the application object so as not to overlap the second rotating shaft, and the opening and the bottom are positioned on the first rotating shaft, and the bottom side is the The coating apparatus according to claim 1, wherein the coating object is held so as to be on a second rotating shaft side.   The said holding mechanism has a holding part which consists of a holding | maintenance part main body and the holding cover which covers at least one part of the said application target object, and hold | maintains the said application | coating target object in the said holding | maintenance part main body. The coating apparatus as described.   And a rotation speed control mechanism for controlling at least one of a rotation speed of the application object around the first rotation axis and a rotation speed of the application object around the second rotation axis. The coating apparatus according to claim 1.   The coating apparatus according to claim 1, further comprising a coating liquid supply mechanism that supplies a coating liquid to the inside of the coating object.   The coating apparatus according to claim 1, wherein the object to be coated has a substantially hemispherical shape, a substantially spherical shape, or a substantially cylindrical shape. A holding mechanism for holding the application object, a first mechanism for rotating the application object around a first rotation axis that passes through the inside of the application object, and a first mechanism that intersects the first rotation axis A coating method for coating a coating liquid on the inner surface of the coating object using a coating apparatus having a second mechanism for rotating the coating object by one or more rotations about a rotation axis of 2;
A first step of rotating the application object around the first rotation axis without rotating the application object around the second rotation axis;
After the first step, a second step of rotating the application object around the first rotation axis and rotating the application object around the second rotation axis. It has a door,
The distance from the intersection of the first rotation axis and the second rotation axis to the inner surface of the bottom of the application object is 0 to 90 mm, the application object is a light emitting device, and the coating liquid is fluorescent A coating method comprising a body .

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