JP2008126208A - Coating apparatus and coating method, molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus and a coating method, by which a mixing ratio of mixing materials different in specific gravity can be kept constant. <P>SOLUTION: The coating apparatus 1 is provided with a syringe 2 for housing mixing materials different in specific gravity. The coating apparatus 1 is further provided with an agitator comprised of agitation blades 3 and an agitation shaft 4 and a precipitation-inhibiting valve, which are used as mixing ratio-adjusting members for keeping the mixing ratio of mixing materials housed within the syringe 2 constant. The agitator exerts an agitation effect, so as to be able to prevent a mixing material which has a specific gravity higher than the other mixing material from being precipitated. The coating apparatus 2 is further provided with cooling members 7 as other members for adjusting the mixing ratio. The viscosity of a viscous material can be increased by cooling mixing materials with the cooling members 7 when the mixing materials contain such a viscous material, so that a mixing material with a specific gravity higher than that of the other mixing material can be prevented from being precipitated. Therefore, the mixing ratio of such mixing materials differing in specific gravity can be kept constant. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating apparatus and a coating method, and a mold product manufactured using the coating apparatus or the coating method.

  Conventionally, as an apparatus for applying an object to be coated such as a liquid material or a viscous material, the object to be coated is housed in a syringe, and the object to be coated is discharged by a predetermined amount from a nozzle provided at the tip of the syringe and applied. A coating device is used. In particular, when applying liquid materials containing granular, powdery or other additives, or mixed materials mixed with multiple materials with different specific gravities, to prevent separation and settling of the mixed material over time in the syringe. In addition, a coating device is used in which a stirrer is disposed inside the syringe.

  FIG. 14 is a schematic diagram showing a configuration of a conventional coating apparatus. As shown in FIG. 14, the coating apparatus includes a syringe 32 that stores a liquid material or a viscous material therein, and a stirring blade 33 that is rotatably disposed inside the syringe 32. The stirring blade 33 is connected to a stirring shaft 34 that penetrates the lid member 39, and the stirring shaft 34 is connected to a motor 38. The liquid material and the viscous material are agitated inside the syringe 32 by the rotation of the agitation blade 33 accompanying the drive of the motor 38. As a result, separation / sedimentation of the liquid material and viscous material inside the syringe is suppressed. The stirred liquid material or viscous material is discharged through the nozzle 36 connected to the syringe 32 by the screwing member 35.

Furthermore, in the liquid ejection device in which the nozzle for ejecting the liquid material to the outside is configured as a flexible needle, for example, by arranging the flexible needle eccentrically with respect to the stirrer, the inside of the flexible needle syringe There has been proposed a liquid ejecting apparatus in which the end portion on the side can be brought into contact with a stirrer and the liquid material at the end portion of the flexible needle is prevented from being dried and fixed (see, for example, Patent Document 1). In addition, a die bonding apparatus has been proposed in which a needle valve can be freely opened and closed at a nozzle at the tip of a syringe, and liquid dripping from the nozzle can be suppressed (see, for example, Patent Document 2). In addition, a temperature control mechanism is provided to maintain the temperature of the viscous material such as resin at a temperature higher than room temperature, for example, about 40 ° C., thereby reducing the viscosity of the viscous material and improving the resin breakage during resin application. Some devices can do this.
JP-A-6-126227 JP-A-9-115928

  In a conventional coating apparatus for coating mixed materials having different specific gravities (hereinafter abbreviated as mixed materials in the present specification), even if a stirrer is disposed inside the syringe, It is difficult to stir the mixed material in a portion having no width that can effectively stir the mixed material. For example, in FIG. 14, when a part of the mixed material separates and settles and settles on the tip portion of the syringe 32 on the nozzle 36 side or inside the nozzle 36, the mixed material that has settled is sufficient even if the stirring blade 33 is rotated. It cannot be stirred. As a result, a mixed material having a mixing ratio different from a desired mixing ratio is applied, which is a cause that the mixing ratio of the mixed material cannot be kept constant.

  Further, when the mixed material is one or a plurality of different materials from the viscous material, the viscosity of the viscous material inside the syringe varies depending on the ambient temperature. As a result, since the mixing state of the mixed material, that is, the state in which a different kind of material having a specific gravity larger than that of the viscous material settles inside the syringe continues to change due to a change in ambient temperature, the mixing ratio of the mixed material applied to the product It was difficult to keep the constant.

  Therefore, a main object of the present invention is to provide a coating apparatus and a coating method capable of keeping a mixing ratio of mixed materials having different specific gravities constant. Another object of the present invention is to provide a molded product that is manufactured by using the coating apparatus or the coating method and that can reduce product quality variation and facilitate quality control.

  The coating apparatus according to the present invention includes a syringe for storing mixed materials having different specific gravities, and a mixing ratio adjusting member for keeping the mixed ratio of the mixed materials constant for the entire mixed materials stored in the syringe. In this case, the mixing ratio adjusting member can keep the mixing ratio of the mixed material inside the syringe constant, and can suppress sedimentation of the mixed material inside the syringe. For example, the mixing ratio of the mixed materials can be kept within a range of less than ± 3% with respect to a predetermined value, and more preferably within a range of less than ± 1% with respect to the predetermined mixing ratio. In particular, the coating apparatus of the present invention is effective in a manufacturing process of a product in which it is desirable to use a mixed material having a large specific gravity and to separate the mixed material in a product state.

  Preferably, the mixing ratio adjusting member is a viscosity increasing member that increases the viscosity of the mixed material. In this case, when the viscous material and one or a plurality of different materials are mixed and used as the mixed material, the viscosity of the viscous material can be increased by the viscosity increasing member. Thereby, even when the specific gravity of a different material is larger than a viscous material, it can suppress that a different material sinks.

  Preferably, the viscosity increasing member is a cooling member that cools the mixed material. In this case, the viscosity of the viscous material in the liquid state can be increased by cooling the mixed material using a device capable of adjusting the temperature, such as a Peltier element.

  Preferably, the cooling member has a temperature of the mixed material under a condition where the set values of the coating pressure and the coating time are constant, and the change in the coating amount of the mixed material due to the change in the viscosity of the mixed material with respect to the temperature change is 2.5% The mixed material is cooled so as to keep the temperature range within. In this case, since the cooling of the mixed material by the cooling member can be controlled based on the application amount of the mixed material, the mixing ratio of the mixed material can be kept constant.

  Preferably, the cooling member cools the mixed material so as to keep the temperature of the mixed material in a temperature range in which no dew condensation occurs in the mixed material. If the temperature of the mixed material is too low, ambient atmospheric moisture can mix into the mixed material. By setting the temperature of the mixed material in a temperature range that does not cause condensation in the mixed material, mixing of moisture into the mixed material can be prevented.

  Preferably, the coating apparatus further includes a stirrer disposed inside the syringe. The cooling member cools the mixed material so that the temperature of the mixed material is maintained in a temperature range in which viscosity is not generated in the mixed material when the mixed material is stirred by the stirrer. By suppressing mixing of bubbles into the mixed material, the mixed material can be kept in a more suitable state.

  Preferably, in the coating apparatus, the syringe includes a nozzle unit for discharging the mixed material to the outside. The mixing ratio adjusting member includes a stirrer disposed inside the syringe and a settling suppression valve that suppresses settling of the mixed material into the nozzle portion. In this case, due to the stirring effect of the stirrer, it is possible to prevent sedimentation of a material having a higher specific gravity among the mixed materials in the syringe.

  Preferably, the agitator and the sedimentation suppression valve are integrally provided so as to be separable from the syringe. In this case, the replenishment of the material by exchanging the syringe and the operation at the time of washing the stirrer and the sedimentation suppression valve can be facilitated.

  Preferably, the coating apparatus further includes a shaft provided through the stirrer and connected to the settling suppression valve so as to operate the settling suppression valve. In this case, the sedimentation suppression valve can be operated without affecting the stirring motion of the stirrer.

  Preferably, the sedimentation suppression valve is connected to the tip of the stirrer. In this case, the settling suppression valve can be operated by reciprocating the stirrer by a predetermined amount or more.

  Preferably, the sedimentation suppression valve is connected to the stirrer via a spherical body. When the sedimentation suppression valve is in the closed state pressed against the nozzle portion, the force for pressing the sedimentation suppression valve against the nozzle portion is transmitted from the stirrer to the sedimentation suppression valve via a spherical body. When the sedimentation suppression valve is in a closed state, the frictional force at the contact point between the stirrer and the spherical body and the contact point between the sedimentation suppression valve and the spherical body is greater than the frictional force at the contact point between the sedimentation suppression valve and the nozzle part. small. According to this configuration, even when the mixed material is stirred by the rotating motion of the stirrer, the sedimentation suppression valve is not affected by the rotating motion of the stirrer. That is, it is possible to keep the settling suppression valve stationary while being pressed against the nozzle portion. Therefore, it is possible to prevent the occurrence of a problem that the settling suppression valve is rubbed into the nozzle portion. The contact point means that the stirrer and the spherical body (or the sedimentation suppression valve and the spherical body, or the sedimentation suppression valve and the nozzle portion) are in point contact with each other at one point or a plurality of points. And the case where

  Preferably, the sedimentation suppression valve is connected to the stirrer via an elastic body. When the sedimentation suppression valve is closed against the nozzle portion, the force that presses the sedimentation suppression valve against the nozzle portion is transmitted from the stirrer to the sedimentation suppression valve via an elastic body. When the sedimentation suppression valve is in the closed state, a compressive stress of a predetermined value or more is applied to the elastic body. According to this configuration, even when the mixed material is stirred by the reciprocating motion of the stirrer, the sedimentation suppression valve is not affected by the reciprocating motion of the stirrer. That is, it is possible to keep the settling suppression valve stationary while being pressed against the nozzle portion. Therefore, it is possible to prevent the occurrence of a problem that the sedimentation suppression valve is separated from the nozzle portion and the sedimentation suppression valve is in an open state.

  Preferably, the sedimentation suppression valve is connected to the stirrer via an elastic body and a spherical body. When the sedimentation suppression valve is in the closed state pressed against the nozzle portion, the force for pressing the sedimentation suppression valve against the nozzle portion is transmitted from the stirrer to the sedimentation suppression valve via the elastic body and the spherical body. When the sedimentation suppression valve is in the closed state, a compressive stress of a predetermined value or more is applied to the elastic body. According to this configuration, even when the mixed material is stirred by both the rotational motion and the reciprocating motion of the stirrer, the sedimentation suppression valve is not affected by the rotational motion or the reciprocating motion of the stirrer. That is, it is possible to keep the settling suppression valve stationary while being pressed against the nozzle portion. Therefore, it is possible to prevent the occurrence of problems such as rubbing of the sedimentation suppression valve on the nozzle portion and opening of the sedimentation suppression valve away from the nozzle portion.

  Preferably, a magnet is fixed to the stirrer. Another magnet is fixed to the settling suppression valve. When the sedimentation suppression valve is closed against the nozzle, the interaction force between the magnet fixed to the stirrer and the other magnets fixed to the sedimentation suppression valve presses the sedimentation suppression valve against the nozzle. It acts on the sedimentation control valve as a force. When the sedimentation suppression valve is in the closed state, an interaction force greater than a predetermined value is applied to the sedimentation suppression valve. In addition, an interaction force shows the force which a magnet and other magnets repel, or attracts. According to this configuration, even when the mixed material is stirred by both the rotational motion and the reciprocating motion of the stirrer, the sedimentation suppression valve is not affected by the rotational motion or the reciprocating motion of the stirrer. That is, it is possible to keep the settling suppression valve stationary while being pressed against the nozzle portion. Therefore, it is possible to prevent the occurrence of problems such as rubbing of the sedimentation suppression valve on the nozzle portion and opening of the sedimentation suppression valve away from the nozzle portion.

  Preferably, the apparatus further includes a control unit that intermittently discharges the mixed material from the nozzle unit. When the sedimentation suppression valve is in the closed state pressed against the nozzle portion, the volume of the portion of the mixed material path inside the nozzle portion that is not occupied by the sedimentation suppression valve is intermittently discharged. The syringe is formed so as to be equal to or less than the discharge volume per time. In this case, even if the mixed material has settled in a portion of the mixed material path inside the nozzle portion that is not occupied by the sedimentation suppression valve, when the mixed material is discharged, the mixed material exceeds the volume of the portion. Apply. Therefore, the fluctuation | variation of the mixing ratio of the mixed material applied to a product can be suppressed.

  The coating method according to the present invention includes a nozzle portion for discharging the mixed material to the outside, a syringe for storing the mixed material having a different specific gravity, and a stirrer disposed inside the syringe and the nozzle portion. An application apparatus comprising a mixing ratio adjusting member configured to keep a mixing ratio of the mixed material constant with respect to the entire mixed material housed in the syringe, which is configured by a settling suppression valve that suppresses settling of the mixed material of The coating method used. And it has the process of stirring the mixed material inside a syringe with a stirrer. In addition, there is provided a step of applying the mixed material by opening the sedimentation suppression valve that is in a closed state except during application, and opening the predetermined amount of the mixed material from the inside of the syringe through the nozzle portion. In this case, in the step of stirring the mixed material, the mixing ratio of the mixed material inside the syringe can be made constant. Therefore, in the coating step, the coating can be performed with a constant mixing ratio of the mixed material applied to the product.

  Preferably, in the step of applying a predetermined volume of the mixed material, a constant application pressure is constantly applied to the inside of the syringe, and the application pressure and the opening / closing amount and opening / closing time of the sedimentation suppression valve are controlled, respectively. Apply. Here, the application pressure indicates the pressure of gas applied to the space inside the syringe where the mixed material is not accommodated. The opening / closing amount indicates the opening degree of the sedimentation suppression valve, and the larger the opening degree of the sedimentation suppression valve, the larger the amount of the mixed material discharged from the inside of the syringe through the nozzle unit per unit time. The opening / closing time indicates the time during which the sedimentation suppression valve is kept open, that is, the time during which the sedimentation suppression valve is separated from the nozzle portion. In this case, the influence of the water head difference of the mixed material can be reduced. Therefore, the mixing ratio of the mixed material applied to the product can be made constant regardless of the amount of the mixed material stored in the syringe.

  Preferably, the method further includes a step of discharging the mixed material from the inside of the nozzle portion after the step of stirring the mixed material stored in the syringe and before the step of applying the mixed material. Immediately after the mixed material is stored in the syringe, the mixing ratio of the mixed material is not constant. Therefore, immediately after the mixed material is stored in the syringe, application is not started, and the mixed material is first stirred. Furthermore, even when a non-uniform mixed material remains in the nozzle portion, the mixing ratio can be adjusted by providing a step of discharging the mixed material from the inside of the nozzle portion before the step of applying the mixed material. A constant mixed material can be applied to the product.

  The molded product according to the present invention is manufactured by applying mixed materials having different specific gravities using the above-described coating apparatus or coating method. In a molded product manufactured by applying mixed materials having different specific gravities, sedimentation of the mixed material may not be preferable. For example, when a plurality of phosphors having different colors with respect to excitation light are applied, the plurality of phosphors should be evenly mixed in the resin so as not to cause uneven color emission. In that case, by using the above-described coating apparatus or coating method, it is possible to apply the mixed material to the product while keeping the mixing ratio of the mixed material inside the syringe constant. Therefore, it is possible to provide a molded product that can reduce quality variations of products and facilitate quality control.

  As described above, in the coating apparatus and the coating method according to the present invention, the mixing ratio of mixed materials having different specific gravities can be kept constant. And using the said coating device or the coating method, the mold product which reduced the quality variation of the product and made quality control easy can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a configuration of a coating apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing the vicinity of region II in FIG. 1 in an enlarged manner. As shown in FIG. 1, the coating device 1 includes a syringe 2 that stores mixed materials having different specific gravities. The syringe 2 is a container having a bottom (lower side in FIG. 1) and an opening (upper side in FIG. 1), and is formed into a cylindrical shape, for example. A lid member 10 is provided over the opening of the syringe 2.

As the mixed material, for example, a material in which a translucent resin such as an epoxy resin or a silicone resin and a phosphor having a specific gravity larger than that of the translucent resin can be used. A phosphor is a material that is excited by primary light having a peak in the wavelength range of blue to near-ultraviolet light and emits a wavelength longer than that of the primary light. For example, there is a silicate yellow light emitting phosphor (Sr, Ba) ₂ SiO ₄ ; Eu activated by divalent europium. The phosphors to be mixed are not limited to one type, and a plurality of types of phosphors may be mixed.

  The specific gravity of translucent resin such as silicone resin and epoxy resin is about 1. Further, for example, europium-activated alkaline earth metal orthosilicate can be used as the phosphor, and its specific gravity is, for example, about 5.4. The mixing ratio of the mixed materials is, for example, a mixing ratio in which the volume of the phosphor is 1 when the volume of the translucent resin is 4 (that is, the volume of the translucent resin: Volume = 4: 1).

  The coating apparatus 1 includes a stirrer disposed inside the syringe 2. As shown in FIG. 1, a stirrer is constituted by the stirring shaft 4 provided through the lid member 10 and the plurality of stirring blades 3 fixed to the stirring shaft 4. Moreover, as shown in FIG. 2, the syringe 2 includes a nozzle portion 6 for discharging the mixed material to the outside at the bottom thereof. A nozzle 6 a that communicates the inside of the syringe 2 and the outside of the coating apparatus 1 is formed in the nozzle portion 6. Furthermore, a sedimentation suppression valve 5 that suppresses the sedimentation of the mixed material into the nozzle portion 6 is disposed so as to occupy a part of the interior of the nozzle 6a. The sedimentation suppression valve 5 is connected to a sedimentation suppression valve shaft 12 provided through the stirring shaft 4. The stirrer and the sedimentation suppression valve 5 constitute one mixing ratio adjusting member.

  The stirring shaft 4 is held by a pulley 15 outside the opening side of the syringe 2. The pulley 15 is connected to the motor 13. The motor 13 rotates in response to a signal from the control unit 9, and the rotational movement of the motor 13 is transmitted to the stirring shaft 4 through the belt 16 to rotate the stirring shaft 4. Due to the rotational movement of the stirring shaft 4, the stirring blade 3 moves so as to draw a circular orbit around the rotational axis of the stirring shaft 4. By the movement of the stirring blade 3, a portion having a width that can effectively stir the mixed material inside the syringe 2, that is, in the inside of the syringe 2 excluding the inside of the nozzle 6 a partitioned by the settling suppression valve 5. The mixed material is agitated.

  The coating apparatus 1 includes a cooling member 7 provided so as to cover the outer periphery of the side wall of the syringe 2. Further, a temperature measuring body 8 for measuring the temperature of the mixed material is provided inside the syringe 2. The control unit 9 controls the cooling member 7 based on the temperature of the mixed material measured by the temperature measuring body 8. The mixed material is cooled by operating the cooling member 7. In the case of using a mixed material in which a viscous material such as an epoxy resin or a silicone resin is mixed with one or more different kinds of materials as the mixed material, the mixed material in a liquid state is cooled by cooling the mixed material. The viscosity can be increased. That is, the cooling member 7 that cools the mixed material functions as a viscosity increasing member that increases the viscosity of the mixed material. The cooling member 7 as the viscosity increasing member constitutes another mixing ratio adjusting member. In addition to providing the cooling member 7 as the viscosity increasing member, a member for adding an additive such as fumed silica (dry silica) to the resin material may be provided. Further, for example, a resin material having a property that a curing reaction starts when the temperature is raised to a certain temperature or higher may be used.

  For the cooling member 7, for example, a Peltier element that performs cooling by passing a direct current can be used. Further, for example, a water cooling jacket that performs cooling by supplying cooling water to a pipe provided inside the cooling member 7 can be used. Further, for example, a configuration in which fins are provided on the outer periphery of the side wall of the syringe 2 and cooling air is supplied by a fan can be used. Further, the cooling member is not limited to the structure provided on the outer periphery of the side wall of the syringe 2. For example, the mixed material may be cooled by cooling the stirring shaft 4 and the stirring blade 3.

  When the mixed material is applied under the condition that the set values of the application pressure and the application time are constant, the amount of application also changes when the viscosity of the mixed material changes due to the temperature change of the mixed material. That is, when the viscosity of the mixed material is high, the coating amount decreases, and when the viscosity is low, the coating amount increases. Therefore, the mixed material can be cooled such that the temperature of the mixed material is maintained within a temperature range in which the change in the coating amount of the mixed material due to the change in the viscosity of the mixed material with respect to the temperature change is within 2.5%. It is more preferable if the change in the coating amount can be kept within a temperature range of 2.0% to 2.2%. Accordingly, the cooling of the mixed material by the cooling member 7 can be controlled based on the application amount of the mixed material, and as a result, the mixing ratio of the mixed material can be kept constant. In addition, when the application amount of the mixed material is applied so as to completely fill a concave shape such as a cavity of a white LED lighting package, the unevenness due to the surface tension of the surface of the mixed material is a member having the concave shape. It can be confirmed by changing the inclination of the visual observation. Moreover, the weight before and after application | coating of the member to which a mixed material is apply | coated can also be measured, and the application amount can also be obtained with the weight difference.

  The relationship between the change in temperature of the mixed material and the change in viscosity varies depending on the composition of the mixed material. In accordance with the composition of the mixed material, a viscosity change amount ΔV that can change the coating amount of the mixed material within, for example, 2% under the condition that the set values of the coating pressure and the coating time are constant is derived. A Peltier element or the like has a temperature control range. For example, when the temperature control range is ± 1 ° C., the viscosity change amount is ΔV or less in a temperature range of 2 ° C. based on the relationship between the temperature of the mixed material and the viscosity change. The temperature T that can be determined can be determined. In order to suppress sedimentation of the mixed material, the viscosity of the mixed material is preferably high. Therefore, it is more preferable that the temperature T is determined as high as possible, that is, as a low temperature side.

  In addition, the mixed material can be cooled so that the temperature of the mixed material is maintained in a temperature range in which no dew condensation occurs in the mixed material. If the temperature of the mixed material is too low, condensation may occur due to a temperature difference between the atmospheric temperature outside the syringe 2 and the temperature of the mixed material, and moisture in the surrounding air may be mixed with the mixed material. For example, the case where the dew condensation generated inside the syringe 2 is mixed into the mixed material, or the case where the dew condensation generated outside the syringe 2 is mixed into the mixed material during application of the mixed material can be considered. Therefore, by setting the temperature of the mixed material to a temperature range that does not cause condensation in the mixed material, it is possible to prevent moisture from being mixed into the mixed material.

  The saturated water vapor pressure can be approximately calculated by the following Tetens equation. However, the saturated water vapor pressure E (T) (unit: hPa) and temperature T (unit: ° C.) are used.

E (T) = 6.11 × 10 ^ {7.5 × T / (T + 237.3)}
For example, when the temperature of the atmosphere around the coating apparatus 1 is 28 ° C., the saturated water vapor pressure is calculated as 37.8 hPa by the above equation, and when the atmospheric humidity is 50%, the water vapor pressure is 18.9 hPa. Considering that the humidity in the syringe 2 is 85% or less in order to prevent the occurrence of condensation, a temperature of 19.2 ° C. at which the saturated water vapor pressure is 22.3 hPa (= 18.9 / 0.85) is the minimum required. It becomes temperature. Therefore, when the temperature control width of the Peltier element is ± 1 ° C., the temperature set value can be determined as 20.2 ° C. (= 19.2 + 1).

  In addition, in order to maintain the coating device 1 in the dry environment, it is also possible to provide another device that can control the temperature and humidity of the atmosphere around the coating device 1. The temperature range in which dew condensation does not occur in the mixed material varies depending on the environment around the coating apparatus 1, that is, the temperature and humidity of the atmosphere around the coating apparatus. In other words, if the coating apparatus 1 can be maintained in a dry environment, the temperature at which no condensation occurs in the mixed material can be lowered, so that the mixed material is kept at a lower temperature and the viscosity of the mixed material is further increased. The coating apparatus 1 can be operated in a state where

  In addition, the mixed material can be cooled so that the temperature of the mixed material is maintained in a temperature range in which viscosity is not generated in the mixed material when the mixed material is stirred by the stirrer. If the temperature of the mixed material is lowered too much, that is, the viscosity of the viscous material is increased too much, bubbles may be mixed into the mixed material when the mixed material is stirred. The above temperature range can vary depending on the shape of the stirrer and the number of rotations, and an example is given below. For example, when organically modified silicone and a phosphor are used as the mixed material, by setting the lower limit value of the temperature of the mixed material to 13 ° C., mixing of bubbles into the mixed material can be suppressed. If the lower limit value of the temperature of the mixed material is set to 19 ° C., both the mixing of bubbles into the mixed material and the occurrence of condensation can be suppressed, and the mixed material can be kept in a more suitable state.

  As for the standard for the presence or absence of bubbles in the mixed material, it is ideal that there are no bubbles at all. In practice, however, the mixed material applied to a product such as a light-emitting device should be observed with a microscope from above. Can be determined. For example, it can be determined on the basis that the maximum diameter of bubbles is 200 μm or less and the total volume of bubbles is less than or equal to the volume of a sphere having a diameter of 200 μm. The reference value can be changed depending on the size of a product such as a light emitting device.

  As described above, the entire mixed material stored in the syringe 2 by the action of the agitator and the sedimentation suppression valve 5 as one mixing ratio adjusting member and the cooling member 7 as another mixing ratio adjusting member. The mixing ratio of the mixed material can be kept constant. That is, it is possible to obtain an effect of stirring and mixing the mixed material with the stirrer in a state where the sedimentation suppression valve 5 is closed. Moreover, the mixed material can be cooled by the cooling member 7 as a viscosity increasing member, and the viscosity of the mixed material can be increased. Thereby, when using a mixed material in which a viscous material and one or more different types of materials are mixed, even if the specific gravity of the different types of materials is greater than that of the viscous material, Sedimentation to the bottom of the can be suppressed. Therefore, the mixing ratio of the mixed material can be kept constant. Note that it is preferable to use a silicone resin as the viscous material because it is a resin having a high viscosity, so that sedimentation of the mixed material can be further suppressed.

  The mixed material whose mixing ratio becomes constant by the mixing ratio adjusting member is discharged to the outside of the syringe 2 through the nozzle 6a. By opening and closing the sedimentation suppression valve 5, the discharge of the mixed material can be controlled. In this embodiment, as shown in FIG. 1, in order to control the opening and closing of the settling suppression valve 5, a settling suppression valve shaft 12 is provided through the stirring shaft 4. One end of the sedimentation suppression valve shaft 12 is connected to the sedimentation suppression valve 5, and the other end of the sedimentation suppression valve shaft 12 is coupled to the actuator 14 outside the opening side of the syringe 2. The actuator 14 receives a signal from the control unit 9 and reciprocates the sedimentation suppression valve shaft 12 in the axial direction. By the reciprocating motion of the sedimentation suppression valve shaft 12, the sedimentation suppression valve 5 connected to one end of the sedimentation suppression valve shaft 12 opens and closes. As the actuator 14, for example, an air cylinder, a linear motion motor, an eccentric cam, or the like can be used.

  By providing the sedimentation suppression valve shaft 12, the opening / closing of the sedimentation suppression valve 5 is controlled independently of the rotational motion of the stirring shaft 4. That is, the sedimentation suppression valve 5 can be operated without affecting the stirring motion of the stirrer. Therefore, even when the sedimentation suppression valve 5 is in the open state, the mixed material inside the syringe 2 can be agitated, so that the mixing ratio of the mixed material can be kept constant while the mixed material is discharged. As shown in FIG. 1, the sedimentation suppression valve shaft 12 that penetrates the stirring shaft 4 needs to be thin and long. However, the sedimentation suppression valve shaft has a structure that penetrates only a part of the stirring shaft, and is shorter. A sedimentation control valve shaft with improved strength may be used. Furthermore, since it is only necessary to control the operation of the settling suppression valve independently of the stirring motion of the stirrer, for example, a configuration in which the settling suppression valve is opened by a member such as a pin urged by an elastic body may be used. Further, for example, the sedimentation suppression valve may be operated by electromagnetic driving.

  Further, as shown in FIG. 1, the syringe 2 and the lid member 10 are coupled by a plurality of bolts 11. The syringe 2 and the lid member 10 can be separated by removing the bolt 11. The syringe 2 and the lid member 10 are not limited to the coupling by the bolt 11, for example, the syringe 2 and the lid member 10 may be threaded, and the syringe 2 may be directly screwed and coupled to the lid member 10. In this case, it is not necessary to use the bolt 11. When the syringe 2 is separated from the lid member 10, the agitation shaft 4, the sedimentation suppression valve shaft 12 provided through the agitation shaft 4, and the sedimentation suppression valve 5 connected to one end of the sedimentation suppression valve shaft 12. Is integrated with the lid member 10 and separated from the syringe 2. That is, the stirrer and the sedimentation suppression valve 5 are provided so as to be separable from the syringe 2 as one body. Therefore, when the mixed material is replenished to the syringe 2, a method of replacing the syringe 2 in which the mixed material is stored can be used. Moreover, since the stirrer and the sedimentation suppression valve 5 can be washed in a state where the syringe 2 is separated during maintenance of the coating apparatus 1, it is possible to facilitate the operation at the time of washing the agitator and the sedimentation suppression valve 5. it can.

  Next, an application method for applying mixed materials having different specific gravities to products using the above-described application apparatus will be described. FIG. 3 is a flowchart showing an example of a coating method. An example of the coating method will be described with reference to FIG. First, in step (S10), a mixed material such as a material in which a translucent resin such as an epoxy resin or a silicone resin and a phosphor having a specific gravity greater than that of the translucent resin are mixed inside the syringe 2. Store. For example, the syringe 2 in which the mixed material is stored can be coupled to the lid member 10 by the bolt 11. Further, for example, the mixed material can be supplied into the syringe 2 through the supply path formed in the lid member 10. The cooling member 7 may be activated and continuously operated before the mixed material is stored in the syringe 2, or may be activated after the mixed material is stored in the syringe 2.

  Next, in step (S20), stirring is started. Specifically, the motor 13 is started, and the rotational motion of the motor 13 is transmitted to the stirring shaft 4 through the belt 16 to rotate the stirring shaft 4. Due to the rotational movement of the stirring shaft 4, the stirring blade 3 moves so as to draw a circular orbit around the rotational axis of the stirring shaft 4. By the movement of the stirring blade 3, the mixed material inside the syringe 2 is stirred. Next, in step (S30), the sedimentation control valve 5 is opened. Specifically, the sedimentation suppression valve shaft 12 is moved to the opening side of the syringe 2 by the actuator 14. Then, the sedimentation suppression valve 5 connected to one end of the sedimentation suppression valve shaft 12 is opened.

  Next, in step (S40), the mixed material is applied. Specifically, the opening of the sedimentation suppression valve 5 (how much the sedimentation suppression valve 5 is opened) is set to a predetermined value. That is, the movement distance for moving the sedimentation suppression valve shaft 12 to the opening of the syringe 2 by the actuator 14 is set to a predetermined value. In addition, the time during which the sedimentation suppression valve 5 is kept open is a predetermined time. If the sedimentation suppression valve 5 is in the open state, the mixed material can be discharged from the inside of the syringe 2 through the nozzle 6a by the action of gravity. Therefore, a predetermined volume of the mixed material can be applied to the product by controlling the opening degree of the sedimentation suppression valve 5 and the time for keeping it in the open state. In accordance with physical properties such as the viscosity and specific gravity of the mixed material to be applied, a relationship between the volume of the mixed material discharged and the control set value of the settling suppression valve 5 is obtained in advance, and the control set value of the settling suppression valve 5 is obtained. Can be determined. As a result, a predetermined volume of the mixed material required for product manufacture can be applied to the product with high accuracy.

  Next, in step (S50), the sedimentation control valve 5 is closed. Specifically, the sedimentation suppression valve shaft 12 is moved to the bottom side of the syringe 2 by the actuator 14. And the sedimentation suppression valve 5 will be in an open state by pressing the sedimentation suppression valve 5 connected with the end of the sedimentation suppression valve axis | shaft 12 to the nozzle part 6 by the side of the bottom part of the syringe 2, and blocking the nozzle 6a. Next, in step (S60), stirring is stopped. Specifically, by stopping the motor 13, the rotational motion of the stirring shaft 4, that is, the motion of the stirring blade 3 is stopped.

  In the coating method described above, the mixed material is cooled by the cooling member 7 and stirred by the stirrer (that is, the stirring blade 3 and the stirring shaft 4) inside the syringe 2, so that the mixing ratio of the mixed material is constant. can do. Therefore, the mixed material can be applied to the product with the mixing ratio of the mixed material applied to the product being constant. In addition, regarding stirring of the mixed material, it is possible to continuously operate the stirrer, but it is also possible to operate the stirrer intermittently at intervals so as not to cause sedimentation of the mixed material.

  FIG. 4 is a flowchart showing a modification of the coating method. A modification of the coating method will be described with reference to FIG. The coating method shown in FIG. 4 and the coating method shown in FIG. 3 described above basically include the same steps. However, the modification of the coating method shown in FIG. 4 is different from the coating method shown in FIG. 3 in that steps (S21), (S22), and (S51) are added.

  Specifically, as shown in FIG. 4, after starting stirring in the step (S20), pressurized gas is supplied into the syringe 2 in the step (S21). For example, an air passage can be formed in the lid member 10 and pressurized gas can be supplied via the air passage. For example, a pressurized gas can be supplied by providing a valve in a path that communicates a supply source of the pressurized gas and the ventilation path and opening the valve. Application pressure is given to the inside of the syringe 2 by supply of the pressurized gas. Here, the application pressure indicates the pressure of gas applied to the space inside the syringe where the mixed material is not accommodated.

  Next, in step (S22), the mixed material is discharged from the inside of the nozzle portion 6. Specifically, the sedimentation suppression valve 5 is opened before the mixed material is applied to the product. Then, the sedimentation suppression valve 5 is set to a predetermined opening for a predetermined time determined in order to discharge the mixed material from the inside of the nozzle portion 6 (that is, to discharge the mixed material remaining in the nozzle 6a). Then, the sedimentation suppression valve 5 is closed. Thereafter, in step (S30), the sedimentation suppression valve 5 is opened to apply the mixed material to the product.

  Further, after the sedimentation control valve 5 is closed in the step (S50), the pressurized gas is stopped in the step (S51). For example, the pressurized gas can be stopped by closing a valve provided in a path connecting the supply source of the pressurized gas and the ventilation path formed in the lid member 10. Then, stirring is stopped in a process (S60). The other steps shown in FIG. 4 are the same as described in FIG. 3, and therefore description thereof will not be repeated.

  In the modification of the application method described above, the influence of the water head difference of the mixed material can be reduced by applying the application pressure to the inside of the syringe 2. That is, the mixing ratio of the mixed material applied to the product can be made constant regardless of the amount of the mixed material stored in the syringe 2. If the sedimentation suppression valve 5 is in the closed state, the mixed material will not be discharged even if an application pressure is applied to the inside of the syringe 2, so that the pressurized gas can be continuously supplied. In addition, if a packing is installed in the coupling | bond location of the syringe 2 and the cover member 10, a leak of pressurized gas can be prevented. Further, by discharging the mixed material from the inside of the nozzle 6a before applying the mixed material to the product, the mixing ratio is made constant even when the non-uniform mixed material remains in the nozzle 6a. The mixed material can be applied to the product. When the mixed material is discharged from the inside of the nozzle 6a, the mixed material stored in the syringe 2 is already sufficiently mixed by cooling and stirring. Therefore, even if the mixed material remains in the nozzle 6a after the step (S22), the mixed material remaining in the nozzle 6a has the same mixing ratio as the mixing ratio applied to the product. Therefore, the mixing ratio of the mixed material applied to the product is not affected. That is, a mixed material with a constant mixing ratio can be applied to the product.

  As shown in FIG. 2, the sedimentation suppression valve 5 is disposed so as to occupy a part of the inside of the nozzle 6 a when being closed and pressed against the nozzle portion 6. At this time, the volume of the portion not occupied by the sedimentation control valve 5 in the nozzle 6a, which is the path of the mixed material in the nozzle section 6, is discharged intermittently for the mixed material discharged once. The syringe 2 can be formed so as to be equal to or smaller than the volume. If the syringe 2 is formed in this way, even if the mixed material has settled in a portion of the inside of the nozzle 6a that is not occupied by the settling suppression valve, when the mixed material is discharged, the volume exceeding the volume of the portion is mixed. Material can be applied. That is, the degree to which the mixed material that has settled inside the nozzle 6a affects the mixing ratio of the mixed material applied to the product can be reduced. Therefore, fluctuations in the mixing ratio of the mixed material applied to the product can be further suppressed.

  As described above, in the coating apparatus and the coating method according to this embodiment, it is possible to suppress sedimentation of a material having a higher specific gravity among the mixed materials by the stirring effect of the stirrer inside the syringe 2. . When using a mixed material in which a viscous material and one or more different materials are mixed, the viscosity of the viscous material can be increased by the viscosity increasing member, so even if the specific gravity of the different material is greater than that of the viscous material. It is possible to prevent the dissimilar materials from settling. Therefore, the mixing ratio of the mixed materials having different specific gravities accommodated in the syringe 2 can be kept constant. That is, sedimentation of the mixed material, that is, retention of a material having a higher specific gravity on the bottom side of the syringe 2 can be suppressed inside the syringe 2. For example, the mixing ratio of the mixed materials can be kept within a range of less than ± 3% with respect to a predetermined value, and more preferably within a range of less than ± 1% with respect to the predetermined mixing ratio. In particular, the coating apparatus of this embodiment is effective in a manufacturing process of a product in which it is desirable to use a mixed material having a large specific gravity and to separate the mixed material in a product state.

  Then, by using the coating apparatus and the coating method of this embodiment, it is possible to manufacture a molded product by applying mixed materials having different specific gravities. FIG. 10 is a schematic diagram showing the appearance of white illumination as an example of a molded product. In the process of manufacturing the white illumination 27 shown in FIG. 10, a blue LED (not shown) is installed in advance on the bottom side of the mixed material application unit 28, and then a mixed material 29 containing a phosphor is applied. Thus, when the white illumination 27 is turned on, the white light appears to be white by simultaneously viewing the yellow light from the phosphor excited by the blue LED and the blue light of the LED, so that a white emission color can be obtained. it can. When the mixed material 29 including the phosphor is applied, the mixing ratio of the mixed material can be kept constant by using the coating apparatus and the coating method of this embodiment. As a result, it is possible to reduce the quality variation of the white illumination 27 and facilitate quality control.

(Embodiment 2)
FIG. 5 is a schematic diagram showing a configuration of a coating apparatus according to Embodiment 2 of the present invention. As shown in FIG. 5, in the coating apparatus 1 of Embodiment 2, the sedimentation suppression valve 5 is connected to one end of the stirring shaft 4 constituting the stirrer. The other end of the stirring shaft 4 is connected to the motor 13 outside the opening side of the syringe 2. The agitation shaft 4 can be reciprocated in the axial direction by the actuator 14.

  When the motor 13 rotates in response to a signal from the control unit, the stirring shaft 4 connected to the motor 13 also rotates. Due to the rotational movement of the stirring shaft 4, the stirring blade 3 moves so as to draw a circular orbit around the rotational axis of the stirring shaft 4. By the movement of the stirring blade 3, the mixed material inside the syringe 2 is stirred. Further, the actuator 14 receives a signal from the control unit and reciprocates the stirring shaft 4 in the axial direction. The reciprocating motion of the stirring shaft 4 opens and closes the settling suppression valve 5 connected to one end of the stirring shaft 4. Therefore, compared with the coating apparatus of the first embodiment, the coating apparatus 1 of this embodiment can perform the stirring of the mixed material and the operation of the sedimentation suppression valve with a simple structure, thereby reducing the manufacturing cost of the apparatus. can do. Since the other configuration of the coating apparatus 1 is as described in the first embodiment including the cooling member not shown in FIG. 5, the description thereof will not be repeated.

(Embodiment 3)
FIG. 6 is a schematic diagram illustrating a configuration around a sedimentation suppression valve of the coating apparatus according to the third embodiment. The coating apparatus of Embodiment 3 and the coating apparatus of Embodiment 2 described above basically have the same configuration. However, the third embodiment is different from the second embodiment in that the configuration around the sedimentation control valve is as shown in FIG. Specifically, as shown in FIG. 6, a space is formed inside the stirring shaft 4, and a spherical body 21 is included inside the space. The sedimentation suppression valve 5 is in contact with the spherical body 21 at the end of the syringe 2 on the opening side (the upper side in FIG. 6). The sedimentation suppression valve 5 is connected to the stirring shaft 4 with a spherical body 21 interposed therebetween.

  As shown in FIG. 6, when the sedimentation suppression valve 5 is closed against the nozzle portion 6, the force that presses the sedimentation suppression valve 5 against the nozzle portion 6 is spherical from the stirring shaft 4 constituting the stirrer. It is transmitted to the sedimentation suppression valve 5 through the body 21. When the sedimentation suppression valve 5 is in the closed state, the frictional force at the contact 24 between the stirring shaft 4 and the spherical body 21 and at the contact 25 between the sedimentation suppression valve 5 and the spherical body 21 is the sedimentation suppression valve 5 and the nozzle portion. 6 is configured to be smaller than the frictional force at the contact point 26 with respect to 6. For example, the optimum surface roughness, material, etc. of the spherical body 21 can be selected in accordance with the magnitude of the force required to press the sedimentation suppression valve 5 against the nozzle portion 6.

  With the configuration of the coating apparatus of the third embodiment, even when the mixed material is agitated by the rotational motion of the stirring shaft 4, the sedimentation suppression valve 5 is not affected by the rotational motion of the stirring shaft 4. That is, the settling suppression valve 5 can be kept stationary while being pressed against the nozzle portion 6. Therefore, it is possible to prevent the sedimentation suppression valve 5 from rubbing on the nozzle portion 6 and the occurrence of a problem that the sedimentation suppression valve 5 or the nozzle portion 6 is worn.

(Embodiment 4)
FIG. 7 is a schematic diagram illustrating a configuration around the sedimentation suppression valve of the coating apparatus according to the fourth embodiment. The coating apparatus according to the fourth embodiment and the coating apparatus according to the third embodiment described above basically have the same configuration. However, in the fourth embodiment, as shown in FIG. 6, the spring 22 is provided instead of the spherical body, and the sedimentation suppression valve 5 is connected to the stirring shaft 4 through the spring 22. This is different from the third form.

  As shown in FIG. 7, when the sedimentation suppression valve 5 is closed against the nozzle portion 6, the force that presses the sedimentation suppression valve 5 against the nozzle portion 6 is transmitted from the stirring shaft 4 constituting the stirrer to the spring. 22 is transmitted to the sedimentation suppression valve 5 through the medium 22. When the sedimentation suppression valve 5 is in the closed state, the spring 22 is configured so that a compressive stress of a predetermined value or more is applied. For example, the optimum spring constant corresponding to the magnitude of the force required to press the sedimentation control valve 5 against the nozzle portion 6 and the length of the spring 22 in the expansion / contraction direction of the space where the spring 22 is installed. Can be selected. It is also possible to use an elastic body such as rubber instead of the spring 22.

  With the configuration of the coating apparatus according to the fourth embodiment, even when the mixed material is agitated by the reciprocating motion of the agitation shaft 4, the agitation shaft 4 is reciprocated within a range in which the compression stress can be maintained on the spring 22. In this case, the sedimentation control valve 5 is not affected by the reciprocating motion of the stirring shaft 4. That is, the settling suppression valve 5 can be kept stationary while being pressed against the nozzle portion 6. Therefore, the sedimentation suppression valve 5 is separated from the nozzle portion 6, the sedimentation suppression valve 5 is opened, and it is possible to prevent a problem that the mixed material leaks from the nozzle 6a.

(Embodiment 5)
FIG. 8 is a schematic diagram showing the configuration around the sedimentation suppression valve of the coating apparatus according to the fifth embodiment. The coating apparatus according to the fifth embodiment and the coating apparatus according to the third embodiment described above basically have the same configuration. However, in the fifth embodiment, as shown in FIG. 8, a spring 22 is provided in addition to the spherical body 21, and the sedimentation suppression valve 5 is connected to the stirring shaft 4 with the spherical body 21 and the spring 22 interposed therebetween. This is different from the third embodiment.

  When the sedimentation suppression valve 5 is pressed against the nozzle portion 6, the sedimentation suppression valve 5 is forced to press the sedimentation suppression valve 5 against the nozzle portion 6 via the spring 22 and the spherical body 21 from the stirring shaft 4. Is transmitted to. When the sedimentation suppression valve 5 is in the closed state, the frictional force at the contact point between the sedimentation suppression valve 5 and the spherical body 21 is smaller than the frictional force at the contact point between the sedimentation suppression valve 5 and the nozzle portion 6. In addition, the coating apparatus is configured so that a compressive stress of a predetermined value or more is applied to the spring 22.

  Even when the mixed material is stirred by both the rotational motion and the reciprocating motion of the stirring shaft 4 due to the configuration of the coating apparatus of the fifth embodiment, the sedimentation suppression valve 5 is affected by the rotational motion or the reciprocating motion of the stirring shaft 4. There is nothing. That is, the settling suppression valve 5 can be kept stationary while being pressed against the nozzle portion 6. Therefore, it is possible to prevent the occurrence of problems such as rubbing of the sedimentation suppression valve 5 on the nozzle portion 6 and the opening of the sedimentation suppression valve 5 away from the nozzle portion 6. In FIG. 8, the spherical body 21 and the spring 22 are arranged so that the spherical body 21 contacts the sedimentation control valve 5 and the spring 22 contacts the stirring shaft 4. The spherical body 21 may contact the stirring shaft 4 and the spring 22 may contact the settling suppression valve 5.

(Embodiment 6)
FIG. 9 is a schematic diagram showing the configuration around the sedimentation suppression valve of the coating apparatus according to the sixth embodiment. The coating apparatus of Embodiment 6 and the coating apparatus of Embodiment 5 described above basically have the same configuration. However, in the sixth embodiment, as shown in FIG. 9, instead of the spherical body and the spring, a pair of permanent magnets 23 whose magnetizing directions are opposite to each other are arranged, and one of the permanent magnets 23 is the rotating shaft 4. The second embodiment is different from the fifth embodiment in that the other permanent magnet 23 is fixed to the sedimentation suppression valve 5.

  When the sedimentation suppression valve 5 is closed against the nozzle portion 6, the interaction force between the one permanent magnet 23 fixed to the stirring shaft 4 and the other permanent magnet 23 fixed to the sedimentation suppression valve 5. However, it acts on the sedimentation suppression valve 5 as a force that presses the sedimentation suppression valve 5 against the nozzle portion 6. Then, when the sedimentation suppression valve 5 is in the closed state, the coating apparatus is configured so that an interaction force of a predetermined value or more is applied to the sedimentation suppression valve 5. In other words, the agitation shaft 4 reciprocates in the axial direction with the amplitude within a range where the interaction force of the permanent magnet 23 becomes a predetermined value or more. In FIG. 9, the force of repulsion between one permanent magnet 23 and the other permanent magnet 23 acts as an interaction force. In addition, by changing the arrangement of the permanent magnets (for example, one permanent magnet is arranged on the bottom side of the syringe 2 in the space formed inside the stirring shaft 4), the force attracted by the permanent magnets is the interaction force. It can be made to act as.

  With the configuration of the coating apparatus according to the sixth embodiment, even when the mixed material is stirred by both the rotational motion and the reciprocating motion of the stirring shaft 4, the stirring shaft 4 is reciprocated within a range in which the interaction force of the permanent magnet 23 can be maintained. If it is made to move, the sedimentation control valve 5 will not be affected by the rotational motion or reciprocating motion of the stirring shaft 4. That is, the settling suppression valve 5 can be kept stationary while being pressed against the nozzle portion 6. Therefore, it is possible to prevent the occurrence of problems such as rubbing of the sedimentation suppression valve 5 on the nozzle portion 6 and the opening of the sedimentation suppression valve 5 away from the nozzle portion 6.

Embodiment 1 of the present invention will be described below. An experiment for producing white illumination using a blue LED and a phosphor was performed by the coating apparatus and the coating method of the present invention. Silicone resin is used as the translucent resin, and silicate yellow light emitting phosphor (Sr, Ba) ₂ SiO ₄ ; Eu activated with divalent europium is used as the phosphor, and the volume of the translucent resin is increased. In a mixing ratio (volume of translucent resin: volume of phosphor = 4: 1) in which the volume of the phosphor was 1 when the volume was 4, the syringe was housed. Using a Peltier element, the temperature of the mixed material of the translucent resin and the phosphor was controlled to be maintained at 23 ° C. And the chromaticity dispersion | variation of the light-emitting device (about 3900 pieces) manufactured by apply | coating a mixed material on blue LED was investigated.

  FIG. 11 is a graph in which the chromaticity of the light emitting device is plotted on an xy chromaticity diagram. In FIG. 11, the horizontal axis indicates chromaticity coordinates x, and the vertical axis indicates chromaticity coordinates y. In FIG. 11, (a) is the chromaticity of the light-emitting device manufactured by controlling the mixed material to be kept at 23 ° C. As a comparative example, the chromaticity of a light emitting device manufactured without performing temperature control using a Peltier element is shown in (b), and the chromaticity of a light emitting device manufactured by controlling the mixed material to be kept at 40 ° C. ( Each is shown in c). In addition, in the graph of FIG. 11, the specification rank which can be used as white illumination of the chromaticity of a light-emitting device was shown as a target frame.

  As shown in FIG. 11A, as a result of plotting the chromaticity of the light emitting device manufactured by controlling the mixed material so as to be kept at 23 ° C., it was in the vicinity of the center of the target frame. Then, the chromaticity plots deviating from a certain curve were smaller than in FIG. 11B. Further, as shown in FIG. 11C, the curve formed by the chromaticity plot does not show a tendency to extend and spread over a very wide range. From this result, it was confirmed that by controlling the temperature of the mixed material optimally, it was possible to apply the mixed material with a constant mixing ratio to the product, thereby reducing the product variation of the light emitting device.

  Embodiment 2 of the present invention will be described below. Silicone resin is used as the translucent resin, silicate yellow light emitting phosphor (Sr, Ba) 2SiO4; Eu activated with divalent europium is used as the phosphor, and the volume of the translucent resin is 4 Then, a mixed material having a mixing ratio (volume of translucent resin: volume of phosphor = 4: 1) with a phosphor volume of 1 was prepared. In this case, the relationship between the temperature change and the viscosity change of the mixed material and the relationship between the viscosity change of the mixed material and the change in the coating amount were clarified.

  FIG. 12 is a graph showing the relationship between the temperature change and the viscosity change of the mixed material. In FIG. 12, the horizontal axis represents the temperature (unit: ° C) of the mixed material, and the vertical axis represents the viscosity (unit: mPa · s) of the mixed material. As shown in FIG. 12, the viscosity increases as the temperature of the mixed material decreases. Further, the amount of change in the viscosity varies depending on the temperature range even if the temperature range is constant. That is, when the temperature of the mixed material is lowered, the amount of change in viscosity in a certain temperature range is increased. FIG. 13 shows the coating conditions (for example, coating pressure, coating time, coating cycle of the coating apparatus (that is, processes such as a descending speed, a lower end stop time, a coating timing, a rising speed, a rising distance, etc.) It is a graph which shows the relationship between the viscosity of a mixed material, and the application quantity in the case of being constant. In FIG. 13, the horizontal axis represents the viscosity of the mixed material, and the vertical axis represents the coating amount of the mixed material. As shown in FIG. 13, when the coating conditions are constant, the coating amount decreases as the viscosity of the mixed material increases, and the coating amount increases as the viscosity increases.

  Based on the above relationship, the relationship between the temperature of the mixed material and the coating amount was determined. When the target application amount range is determined, the application condition is determined by a viscosity that does not sink the mixture or exceeds the allowable viscosity for sedimentation of the mixture, and the use viscosity range is determined by the relationship between the application condition and the viscosity. The temperature can be set so that this viscosity range is used. For example, the viscosity change amount ΔV that can change the coating amount of the mixed material within 2% is about 67 mPa · s. Assuming that the temperature control width of the Peltier element is ± 1 ° C., a temperature range in which the amount of change in viscosity ΔV can be about 67 mPa · s or less in a temperature range of 2 ° C. may be determined. This temperature range was derived to be 19 ° C. or higher and 21 ° C. or lower.

  Note that the coating apparatus and the coating method of the present invention are not limited to mold products such as white illumination, and can be used for various applications. For example, it can be used for the purpose of bonding a semiconductor to a substrate or the like using a die bond paste, or for the purpose of quantitatively discharging an adhesive, a sealing material, paint, ink or the like.

  The embodiments and examples disclosed herein are illustrative in all respects and should not be construed as being restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram which shows the structure of the coating device of Embodiment 1 of this invention. It is a schematic diagram which expands and shows the area | region II area | region of FIG. It is a flowchart which shows an example of the coating method. It is a flowchart which shows the modification of the coating method. 6 is a schematic diagram illustrating a configuration of a coating apparatus according to Embodiment 2. FIG. FIG. 6 is a schematic diagram illustrating a configuration around a sedimentation suppression valve of a coating apparatus according to a third embodiment. FIG. 10 is a schematic diagram showing a configuration around a sedimentation suppression valve of a coating apparatus according to a fourth embodiment. FIG. 10 is a schematic diagram showing a configuration around a sedimentation suppression valve of a coating apparatus according to a fifth embodiment. FIG. 10 is a schematic diagram illustrating a configuration around a sedimentation suppression valve of a coating apparatus according to a sixth embodiment. It is a schematic diagram which shows the external appearance of white illumination. It is the graph which plotted the chromaticity of the light-emitting device on xy chromaticity diagram. It is a graph which shows the relationship between the temperature change of a mixed material, and a viscosity change. It is a graph which shows the relationship between the viscosity of a mixed material, and the application quantity. It is a schematic diagram which shows the structure of the conventional coating device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Coating device, 2 Syringe, 3 Stirring blade, 4 Stirring shaft, 5 Sedimentation suppression valve, 6 Nozzle part, 6a Nozzle, 7 Cooling member, 8 Temperature measuring body, 9 Control part, 10 Lid member, 11 Bolt, 12 Sedimentation suppression Valve shaft, 13 Motor, 14 Actuator, 15 Pulley, 16 Belt, 21 Spherical body, 22 Spring, 23 Permanent magnet, 24, 25, 26 Contact, 27 White illumination, 28 Mixed material application part, 29 Mixed material, 32 Syringe, 33 stirring blades, 34 stirring shafts, 35 screwing members, 36 nozzles, 38 motors, 39 lid members.

Claims (20)

A syringe containing mixed materials of different specific gravity,
An application apparatus comprising: a mixing ratio adjusting member for keeping a mixing ratio of the mixed material constant for the entire mixed material housed in the syringe.   The coating apparatus according to claim 1, wherein the mixing ratio adjusting member is a viscosity increasing member that increases the viscosity of the mixed material.   The coating apparatus according to claim 2, wherein the viscosity increasing member is a cooling member that cools the mixed material.   In the cooling member, the temperature of the mixed material is set to be 2.5% with a change in the coating amount of the mixed material due to a change in the viscosity of the mixed material with respect to a temperature change under the condition that the set values of the coating pressure and the coating time are constant. The coating apparatus according to claim 3, wherein the mixed material is cooled so as to be maintained within a temperature range within a range.   The said cooling member is a coating device of Claim 3 which cools the said mixed material so that the temperature of the said mixed material may be maintained in the temperature range which does not raise | generate condensation on the said mixed material. A stirrer disposed inside the syringe;
The cooling member cools the mixed material so that the temperature of the mixed material is kept in a temperature range in which viscosity is not generated in the mixed material when the mixed material is stirred by the stirrer. The coating device according to claim 3. The syringe includes a nozzle portion for discharging the mixed material to the outside,
The mixing ratio adjusting member is
A stirrer disposed inside the syringe;
The coating apparatus of Claim 1 containing the sedimentation suppression valve which suppresses sedimentation of the said mixed material to the inside of the said nozzle part.   The coating device according to claim 7, wherein the stirrer and the settling suppression valve are integrally provided so as to be separable from the syringe.   The coating apparatus according to claim 7 or 8, further comprising a shaft provided through the stirrer and connected to the settling suppression valve so as to operate the settling suppression valve.   The coating apparatus according to claim 7 or 8, wherein the settling suppression valve is connected to a tip of the stirrer. The sedimentation suppression valve is connected to the stirrer with a spherical body interposed therebetween,
When the settling suppression valve is in a closed state pressed against the nozzle portion, the force pressing the settling suppression valve against the nozzle portion is transmitted from the stirrer to the settling suppression valve via the spherical body. ,
When in the closed state, the frictional force at the contact point between the stirrer and the spherical body and the contact point between the sedimentation suppression valve and the spherical body is greater than the frictional force at the contact point between the sedimentation suppression valve and the nozzle part. The coating apparatus according to claim 10, which is also small. The settling suppression valve is connected to the stirrer with an elastic body interposed therebetween,
When the settling suppression valve is in a closed state pressed against the nozzle portion, the force pressing the settling suppression valve against the nozzle portion is transmitted from the stirrer to the settling suppression valve via the elastic body. ,
The coating apparatus according to claim 10, wherein a compressive stress of a predetermined value or more is applied to the elastic body when in the closed state. The settling suppression valve is connected to the stirrer with an elastic body and a spherical body interposed therebetween,
When the sedimentation suppression valve is in a closed state pressed against the nozzle part, the force that presses the sedimentation suppression valve against the nozzle part is transmitted from the stirrer through the elastic body and the spherical body to suppress the sedimentation. Transmitted to the valve,
The coating apparatus according to claim 10, wherein a compressive stress of a predetermined value or more is applied to the elastic body when in the closed state. A magnet is fixed to the stirrer,
Another magnet is fixed to the settling suppression valve,
When the sedimentation suppression valve is in a closed state pressed against the nozzle portion, the interaction force between the magnet and the other magnet is applied to the sedimentation suppression valve as a force pressing the sedimentation suppression valve against the nozzle portion. Acting,
The coating apparatus according to claim 10, wherein the interaction force greater than or equal to a predetermined value is applied to the settling suppression valve when in the closed state. A control unit that intermittently discharges the mixed material from the nozzle unit;
When the sedimentation suppression valve is in a closed state pressed against the nozzle portion, the volume of the portion of the mixed material path inside the nozzle portion that is not occupied by the sedimentation suppression valve is discharged intermittently. The coating device according to any one of claims 7 to 14, wherein the syringe is formed so as to be equal to or less than a discharge volume per one time of the mixed material. A coating method using the coating apparatus according to any one of claims 7 to 15,
The mixed material inside the syringe is stirred by the stirrer,
The sedimentation suppression valve is in a closed state except during application, and is opened during application, and the mixed material is applied by discharging a predetermined volume of the mixed material from the inside of the syringe through the nozzle portion. Application method. Always apply coating pressure inside the syringe,
The coating method according to claim 16, wherein a predetermined volume of the mixed material is coated by controlling the coating pressure and the opening / closing amount and opening / closing time of the settling suppression valve.   The mixed material is housed in the syringe, and after the mixed material is stirred, the mixed material is discharged from the inside of the nozzle portion before applying the mixed material. The coating method as described.   A mold product manufactured by applying mixed materials having different specific gravities using the coating apparatus according to any one of claims 1 to 15.   A molded product produced by applying mixed materials having different specific gravities using the coating method according to any one of claims 16 to 18.

Images