Patent Grant
6894260
1. Field of the Invention
The present invention is related to a mounting/dismounting structure of an air-exhausting grill of a hanging type, or wall-embedding type high frequency heating apparatus. The present invention is also related to a U-shaped body and a structure of an upper lid, which construct a housing of a hanging type microwave oven.
2. Description of the Related Art
Referring now to FIG. 1 and
In such a conventional hanging type high frequency heating apparatus as shown in
Then, the claw portions 12 of the lower surface guide 11 of the above-described air-exhausting grill 8 is inserted into the slit holes 16, the screw fixing hole 10 of the upper surface guide 9 is fitted to the screw portion formed in the upper mounting plate 13, and then, the claw portions 12 are fastened by using a plurality of mounting screws 17 so as to be fixed.
In the related art shown in
However, in the above-described conventional hanging type, or wall-embedding type high frequency heating apparatus, mixture gas is sucked by the air-exhausting fan mounted at the upper portion of this high frequency heating apparatus, and then is conducted via the filter from the air-intake port so as to be exhausted by the air-exhausting grill mounted at the upper portion, while this mixture gas is produced by mixing oil components, smoke components, water vapor, seasonings, and the like with each other, which are produced when a cooking is performed by using the gas burners, or the electric burners, which are located at the lower portion.
At this time, however, although a portion of the above-described mixture gas made of the oil/smoke components, the water vapor, and the seasonings may be removed by the filter, the remaining exhausted mixture gas is conducted to the air-exhausting grill 8, so that oil components and dirt are adhered to an air-passage within the air-exhausting grill 8. To remove these oil components and dirt, this air-exhausting grill 8 is dismounted so as to be cleaned. Unless the mounting screws are removed by employing a tool, this air-exhausting grill 8 cannot be dismounted. Also, since these mounting screws are located at higher portions, the air-exhausting grill 8 cannot be dismounted unless a stand is employed. Thus, there are such problems that cumbersome works of preparing the tool are necessarily required, and also a care should be taken as to safety aspects such as injuries.
Moreover, in the microwave oven of the related art, a joint is made between the bottom plate and the lower portion of the body, and the head portion of the screw is projected, and also, the joint and the screw are present in the air-exhausting paths of the ventilation-purpose fan. As a result, noise is produced by wind-killing sound, ventilation capabilities are lowered by resistances, and oil components which are generated from the cooking instrument provided under the microwave oven are adhered to the joint and also the peripheral portions of the screws. Thus, dirt can be hardly removed, which deteriorates the cleaning characteristic. Also, since the joint and the screws are observed, in the case of the hanging type microwave oven, the body of this microwave oven under installation condition is located at eye-levels of users, so that this microwave oven owns a very poor design. Also, when a component is brought into a malfunction condition and this malfunction component is replaced by a normal component, if the body is not completely removed from the microwave oven, then this malfunction component cannot be replaced. Therefore, there is a problem that many steps of replacement operations are required.
The present invention has been made to solve the above-described conventional problems, and therefore, has an object to avoid a high frequency heating apparatus capable of simply mounting and/or dismounting an air-exhausting grill mounted on an upper portion of a main body without any tool to improve a detachability of the air-exhausting grill, capable of detaching the air-exhausting grill in safety and simple manners, and also capable of cleaning the air-exhausting grill in an easy manner, which may solve problems as to cumbersome tool-seeking works and dismounting of the air-exhausting grill by setting a stand.
To solve the above-described problems, such a construction is employed. That is to say, screwing of an air-exhausting grill to a main body of a high frequency heating apparatus is avoided; a fixing claw portion is provided at an upper portion on the side of the air-exhausting grill; this fixing claw portion is inserted into a slit hole of the main body; and also, a fixing hooking portion provided a lower portion on the side of the air-exhausting grill is hooked to a hooking flange of the main body. Also, magneto joint plates are mounted in the vicinity of both side surfaces of the air-exhausting grill; and magneto fixing plates containing magnetos are arranged at a place located opposite to the magneto joint plates, so that the air-exhausting grill is fixed/mounted.
In accordance with the above-described high frequency heating apparatus of the present invention, a plurality of fixing claw portions having plurality of bent Z-shaped flanges are formed on an upper surface guide of said air-exhausting grill, and a plurality of fixing hooking portions having a plurality of notch portions are formed on a lower surface guide. Furthermore, a means for mounting the air-exhausting grill is arranged by utilizing these fixing claw portion and fixing hooking portion and by a slit hole and a hooking flange, which are provided on the main body. Also, another means for fixing the air-exhausting grill in a close contact manner is arranged by magneto joint plates and magneto fixing plates provided within both side surface guides. The use of fixing screws is avoided, the air-exhausting grill can be simply and easily mounted/dismounted without using any tool. As a result, the air-exhausting grill can be easily cleaned, and the clean high frequency heating apparatus can be obtained.
Moreover, the present invention has also another object to provide a hanging type microwave oven constructed in such a manner that an integral type body having a U-shape and having no joint and no screw-fastening is constituted under the hanging type microwave oven; when a ventilating operation is performed by using a ventilation-purpose fan, a ventilating capability can be improved in low noise, and also, the hanging type microwave oven can be easily cleaned and can be made in a smart design, resulting in a good outer view thereof. Also, components under malfunction states can be readily replaced by normal components.
To solve the above-described problems, a high frequency heating apparatus, according to the present invention, is featured by that while a flat upper lid is arranged at an upper portion of a hanging type microwave oven, a body formed in a U-shape is mounted on both edge planes thereof, so that a replacement of a component can be easily carried out, and also, when the hanging type microwave oven is installed above a cooking instrument, a lower portion of this microwave oven has no joint portion.
In accordance with the present invention, approximately 90% of all components which constitute the microwave oven can be replaced by merely removing such an upper lid that the U-shaped body is mounted to be screwed to flanges of both edge planes of this upper lid. Thus, the components can be simply replaced and also can be easily repaired within short time. Also, since the body which is positioned above the cooking instrument is made in a U-shape and in an integral form, such a flat bottom plane having no joint at a lower portion and no projection such as a fixing screw is constituted, so that oil components attached to the U-shaped body, which are caused by oil and smoke components produced during cooking, can be cleaned in a simple manner.
In accordance with one aspect of the present invention, a high frequency heating apparatus, is arranged by such a high frequency heating apparatus comprising: an air-exhausting grill having an air-exhausting port; a magneto joint plate mounted/fixed on an inner side of the air-exhausting grill; and a magneto fixing plate containing a magneto, which is located at a plane opposite to the magneto joint plate. As a consequence, the air-exhausting grill can be simply mounted/dismounted without using any tool, as compared with the method for fastening the air-exhausting grill by way of screws and the like so as to fix this air-exhausting grill.
In accordance with yet another aspect of the present invention, a high frequency heating apparatus is arranged by such a high frequency heating apparatus comprising: an air-exhausting grill having an air-exhausting port, in which a fixing claw portion is provided on an upper surface guide of the air-exhausting grill, and a fixing hooking portion is provided on a lower surface guide; a magneto joint plate mounted/fixed on inner sides of both side surface guides; and a magneto fixing plate containing a magneto, which is located at a plane opposite to the magneto joint plate. As a consequence, the magneto joint plate can be mechanically made in close contact to the magneto fixing plate due to the absorbing force of the magnetos, so that the air-exhausting grill can be mounted without any play, and furthermore, the air-exhausting grill can be simply mounted/dismounted without using any tool, as compared with the method for fastening the air-exhausting grill by way of screws and the like so as to fix this air-exhausting grill.
In accordance with still yet another aspect of the present invention, a high frequency heating apparatus, is featured by that an air-exhausting grill having a large number of segmented air-exhaust ports is arranged at an upper portion of a door and a control panel; a plurality of fixing claw portions having plurality of bent Z-shaped flanges are formed on an upper surface guide of the air-exhausting grill; a plurality of fixing hooking portions having a plurality of notch portions are formed on a lower surface guide; a plurality of slit holes having rectangular shapes, into which the fixing claw portions are inserted, are formed in upper planes located opposite to a rear side of the air-exhausting grill, which is constituted by mounting/fixing magneto joint plates made of a sheet metal on inner sides of both side surface guides; a plurality of hooking flanges into which the fixing/hooking portions are inserted are formed on a lower surface portion; and magneto fixing plates containing magnetos are located at planes opposite to the magneto joint plates of the both side surfaces.
Then, while plural sets of the fixing claw portions are formed on the upper surface guide of the air-exhausting grill and plural sets of the fixing hooking portions are formed on the lower surface guide thereof, the fixing claw portions having the bent Z-shapes are firstly inserted into the slits having the rectangular shapes formed in the main body and located opposite to the fixing claw portion along an upper inclined direction. Then, under such a condition that the fixing claw portions have been engaged with the slits, these fixing claw portions are rotated along a lower direction, while the slits are used as a fulcrum. As a result, the fixing hooking portion partially having a notched concave portion is engaged into the hooking flange formed in the lower portion of the main body, so that such a mechanical fixing means is constituted with respect to force along an upper/lower direction, a right left direction, and a forward/backward direction. Under this condition, since plays are produced due to a play of the slits, and a play dimension of the hook flange, the air-exhausting grill can be finally mounted without any play by the mechanical close-fitting means by employing the magneto absorbing force between the magneto joint plate and the magneto fixing plate. As a consequence, the air-exhausting grill can be simply mounted/dismounted without using any tool, as compared with the method for fastening the air-exhausting grill by way of screws and the like so as to fix this air-exhausting grill.
In accordance with still yet another aspect of the present invention, a high frequency heating apparatus, is arranged by either a hanging type or a wall-embedding type high frequency heating apparatus featured in that an electric burner, or a gas burner is installed at a lower portion; an air-intake port is provided via a filter on a lower surface; an air-exhausting passage is constituted around a heating chamber of a main body of the high frequency heating apparatus; an air-exhausting fan equipped with an air-exhausting fan motor is arranged at an upper portion of the main body; and an air-exhausting grill is mounted on a front surface of the upper portion of the main body. As a result, water vapor passes through the air-exhausting fan from the air-exhausting passage via the filter provided on the air-intake port, and then, is exhausted from the air-exhausting grill arranged at the upper front portion when the air-exhausting fan motor of the main body is driven for ventilation. This water vapor contains oil/smoke components and seasonings, which are produced from cooking by using the burner. Then, the air-exhausting grill is dirtied with oil components due to oil/smoke components and food remainders, so that the air-exhausting grill unit becomes disclosed due to dirt. The air-exhausting grill unit of the high frequency heating apparatus which is installed near eye levels of humans in either the hanging type or the wall-embedding type, can be simply mounted/dismounted without using any tool. The air-exhausting grill unit need not be mounted/dismounted, while the user steps on the stand, so that the safety mounting/dismounting operation can be carried out by the user. Therefore, the cleaning work of the air-exhausting grill can be improved, and the clean appliance can be provided.
In accordance with still yet another aspect of the present invention, a high frequency heating apparatus comprising: a heating chamber for heating food; a magnetron for generating high-frequency electromagnetic waves and for supplying the high-frequency electromagnetic waves into the heating chamber; and a waveguide on which an air-feeding fan for cooling the magnetron is mounted, and which guides the high-frequency electromagnetic waves generated from the magnetron into the heating chamber; an inverter power supply for supplying electric power to the magnetron so as to oscillate the high-frequency electromagnetic waves therefrom; and the air-feeding fan for cooling the inverter power supply, in which a front portion of the heating chamber is constructed of a door and a control panel for driving the above-described electronic components. Then, a body which covers an outer peripheral portion of the above-described high frequency heating apparatus is mounted in a U-shape, and an upper portion of this body is covered by a flat upper lid. Then, this body is fastened to edge planes of this flat upper lid by employing a screw. Ventilation-purpose air-intake ports are formed in both side surfaces of a bottom plane of this U-shaped body, and filters are mounted on these ventilation-purpose air-intake ports. In the hanging type high frequency heating apparatus arranged in such a manner that an air-exhausting path is formed on an outer peripheral wall of the heating chamber by the ventilation-purpose air-intake ports, and a ventilation-purpose fan is arranged at a center of the upper portion within the heating chamber, the body is made in the U-shape and is fastened to the edge planes of the upper lid provided at the upper portion by employing the screw. Thus, the high frequency heating apparatus having the smart design can be provided under hanging condition. Moreover, since there is neither the joint, nor the screw, wind-cutting sound and wind resistance in the air-exhausting path can be reduced, and also, the air ventilating efficiency can be improved in low noise when oil and smoke components, and water vapor, which are produced from a burner located under this high frequency heating apparatus, are sucked from the ventilation-purpose air-intake ports.
Still yet another aspect of the present invention can provide a hanging type high frequency heating apparatus having a high safety characteristic, since the U-shaped body is fabricated as an integral-processed U-shaped body without any joint up to an upper lid. Thus, under hanging condition of this high frequency heating apparatus, there is neither a joint, nor a screw in an eye-level portion, and this high frequency heating apparatus may have a smart design, but has no such a sharp edge, and no projection of a screw. Furthermore, dirt caused by oil and smoke components produced from the lower burner is not deposited on the above-described joint and screw, but may be cleaned by simply wiping this dirt. Thus, the cleaning characteristic of this high frequency heating apparatus can be improved.
Finally, another aspect of the present invention can provide such a hanging type heating apparatus which is arranged in such a manner that an upper edge surface of the U-shaped body is fastened to L-shaped bending portions of both edge planes of a flat upper lid from side surfaces thereof by using screws. When a repairing work is carried out, while the entire body of this hanging type microwave oven need not be disassembled, only the upper lid portion is merely disassembled, so that the troubled electronic components arranged on the upper portion of the heating chamber can be simply repaired, and replaced by normal electronic components. Accordingly, service characteristic of this hanging type microwave oven can be improved by reducing a total manipulation step.
In the drawings, a reference numeral 1 shows a burner; 3 to a high frequency heating apparatus; 4 to a filter; 5 to an air-intake port; 6 to a door; 7 to a control panel; 8 to an air-exhausting grill; 9 to a heating chamber; 11 to an air-exhausting passage; 12 to an air-exhausting fan motor; 13 to an air-exhausting fan; 18 to an upper surface guide; 19 to a fixing claw portion; 20 to a lower surface guide; 21 to a fixing hooking portion; 22 to a side surface guide; 23 to a magneto joint plate; 25 to a slit hole; 27 to a hooking flange; 28 to a magneto fixing plate; 114 to a heating chamber; 125 to a ventilation-purpose fan; 126 to a body; 127 to an upper lid; 128 to a ventilation-purpose air-intake port; and 130 to an air exhaust path.
Referring now to drawings, embodiments of the present invention will be described in detail.
(Embodiment 1)
In
Next, operations and effects as to the high frequency heating apparatus with employment of the above-described arrangement will now be explained.
First, water vapor containing oil/smoke components and seasonings, which are produced when cooking is performed by using the burner 1 which is located at the lower portion and constitutes the cooking instrument, is penetrated through the filter 4 and is then conducted to the air-exhausting passages 11 formed between the heating chamber 9 and the body 10 by such a manner that the air-exhausting motor 12 is driven so as to rotate the air-exhausting fans 13 provided on both edges thereof. This air-exhausting motor 12 is assembled in the upper portion of the high frequency heating apparatus 3 which is arranged at the upper portion via the cooking space 2. The filter 4 is mounted on the air-intake port 5 of the lower portion. This conducted water vapor passes through the air-exhausting fan 13, and then is exhausted from the air-exhausting grill 8 arranged at the upper front portion into the room.
At this time, although the water vapor and like, which contain the oil/smoke components and the seasonings, are absorbed by the filter 4, all of dirt cannot be completely removed, so that the air-exhausting grill 8 is dirtied by the oil components for a long time period, is sticky with the oil components, and becomes disclosed. Thus, values of appliances would be lowered. Similarly, in such a case that desirable cooking is carried out by using the control panel 7 in the heating chamber 9 within the door 6 of the high frequency heating apparatus 3, electromagnetic waves are supplied from the high frequency generating apparatus 16 in response to a signal derived from the controller 14, and at this time, the controller 14 is cooled by the controller cooling fan 15, and also the high frequency generating apparatus 16 are cooled by the cooling fan 17. Also, in this case, when cooking is performed by using the lower burner 1, since the controller cooling fan 15 is driven, the oil/smoke components and the like are sucked from the lower portion. Also, the oil/smoke components and the like produced by performing cooking within the heating chamber 9 are also conducted via the air-exhausting port form the heating chamber 9 into the air-exhausting grill 8 in combination with air sucked from the cooling fan 17, so that dirt of the air-exhausting grill 8 is accelerated. In order to simply and quickly mount/dismount the air-exhausting grill 8 when the air-exhausting grill 8 is dirtied, as explained above, the fixing claw portions 19 having the bent Z-shape are formed on both sides of the upper surface guide 18 employed in the air-exhausting grill 8. Also, the fixing hooking portions 21 are formed on the both sides of the lower surface guide 20, while a tip portion of this fixing hooking portion 21 owns a concave-shaped notch portion. Then, a magneto joint plate 23 is fixed on the inner plane of the side surface guide 22 by using the screws, and also, a slit hole 25 having a rectangular shape is formed in the front portion of the top plate 24 at the position opposite to the main body. Furthermore, a hooking flange 27 having an inversed L-shape is formed on the upper plane flange of the door mounting plate 26 provided in the lower portion, and also, the flange is provided in the vicinity of the upper edge plane of the body 10, so that a magneto fixing plate 28 containing a magneto is constituted. Under mount condition of the air-exhausting grill 8, the fixing claw portion 19 is inserted into the slit hole 25, and the fixing hooking portion 21 is brought into such a condition that the notch portion of the concave portion is entered into the inversed L-shaped portion of the hooking flange 27. Under this condition, since a play is produced due to a play of the hole and a fluctuation of dimensions thereof, the magneto joint plate 23 is attached to the magneto fixing plate 28, so that the magneto joint plate 23 can be fixed in close contact with the magneto fixing plate 28 by utilizing magnetic force of the magneto, and thus, the air-exhausting grill 8 can be mounted with completely no play.
As previously described, the air-exhausting grill 8 can be simply mounted and also can be easily mounted without using any tool. Also, this air-exhausting grill 8 can be mounted without using any screw. As a result, the user need not mount/dismount the air-exhausting grill 8 while the user steps on the stand, resulting in safety mounting of the air-exhausting grill 8. Also, since the air-exhausting grill 8 can be mounted/dismounted in an easy and quick manner, such a clean appliance can be provided with easy cleaning work, while dirt is continuously removed. Then, although the air-exhausting grill 8 can be mounted/dismounted by using no tool and also no screw, the mechanical mounting/dismounting effects of the air-exhausting grill 8 can be maintained by such a manner that since the fixing claw portion having the bent Z-shape and the fixing hooking portion are provided, the air-exhausting grill 8 cannot be dismounted until this air-exhausting grill 8 is rotated along the upper direction, and furthermore, the bent Z-portion is released from the slit hole in a stepped manner.
Even when the high frequency heating apparatus is installed at the higher position in either the hanging mode or the wall-embedding mode, such a detachability having a higher safety characteristic can be provided under such a condition that even if the air-exhausting grill 8 is tensioned along the upper/lower direction, the right/left direction, as well as the forward/backward direction, this air-exhausting grill 8 is not dismounted.
(Embodiment 2)
In
Next, operations of the microwave oven will now be explained. When the door 132 is opened, an article to be heated is set on the table 124 provided inside the heating chamber 114, and then, a cooking mode is selected to start the microwave oven by the operation unit 133. As a result, high frequency electromagnetic waves which are generated from the magnetron 115 by a high frequency generating apparatus such as the inverter power supply 121 are penetrated through the waveguide 116 and then are conducted to the rotary antenna 118 which is rotated by the rotary motor 117, so that while the electromagnetic waves are stirred, the stirred electromagnetic waves may heat the article to be heated so as to cook this article. At this time, both the propeller fan motor 130 is driven so as to cool electronic components of the inverter power supply 121, and also the scirocco fan motor 120 is driven in order to cool the magnetron 115.
Next, in such a case that cooking is carried out by employing the gas burner 135, the ventilation-purpose fan 125 provided in the microwave oven installed on the cabinet shelves 131 is driven by operating the operation unit 133 so as to ventilate exhaust gas produced during cooking, and also water vapor, oil components, smoke components etc., which are produced during cooking. The exhaust gas which is collected via the filters 129 is penetrated through the air exhaust paths 130 formed on both sides of the heating chamber 114, and then, is conducted to the ventilation-purpose fan 125, while the filters 129 are mounted in the ventilation-purpose air-intake ports 28 which are formed in both lower sides of the inverse U-shape body 126. The exhaust gas conducted by the ventilation-purpose fan 125 is exhausted from the outlet port of this ventilation-purpose fan 125 via the exhaust grill 134 provided on the front plane of the microwave oven to an indoor area.
In this case, the ventilation-purpose fan 125 may exhaust the exhausted air along an outdoor direction, depending upon installation way thereof. Apparently, when the exhausted air is exhausted to the indoor area, oil components, smoke components, and impurities may be removed by the filters 129.
Also, the ventilation-purpose fan 125 may be controlled to prevent electronic components of the microwave oven main body from being electronically destroyed in the case that this ventilation-purpose fan 125 is forcibly driven by key-operating the operation unit 133, and/or in such a case that when temperatures of heat exhausted from the gas burner 135 is increased and thus the temperatures of the electronic components of this microwave oven located above this gas burner 135 are increased, the ventilation-purpose fan 125 is automatically controlled by a temperature detecting element (not shown) such as a thermistor so as to be driven.
As previously explained, while the body of the microwave oven is constructed in the U-shape, there is neither a joint, nor a screw connecting the bottom plate. Also, an abutting plane against the joint is the plane having no screw, and a space is not made. As a result, when the ventilation-purpose fan is driven, the exhaust gas which is conducted from the ventilation-purpose air-intake port formed in the lower portion may be exhausted under very low noise, since the wind-cutting sound and the air resistance within the air exhaust path are low, so that the exhausting efficiency can be increased.
Also, when the U-shaped body is set on the cabinet shelf, neither the joint, nor the screw is formed on the eye-level portion, and since the U-shaped body has the rounded portion having the U-shape without the sharp edge corner, this U-shaped body having a smart design can avoid a risk of injuries which are caused by the sharp edge corner and the projected screw, and thus can secure the safety requirement. Furthermore, dirt caused by oil and smoke components supplied from the lower gas burner can be simply wiped away, because of the U-shaped body, so that the clean characteristic and the cleaning effect of this U-shaped body can be improved.
Also, when the electronic components and the like are brought into malfunction conditions, the main body of the hanging type microwave oven is taken down from the cabinet shelf. In this malfunction case, while the entire body of this hanging type microwave oven need not be disassembled, only the upper lid portion is merely disassembled, so that the troubled electronic components arranged on the upper portion of the heating chamber can be repaired, and replaced by normal electronic components. Accordingly, service characteristic of this hanging type microwave oven can be improved by reducing a total manipulation step.
As previously described, the high frequency heating apparatus according to the present invention owns such a construction that the fixing claw portion is inserted into the slit hole at the upper portion of the air-exhausting grill, the fixing hooking portion is inserted into the hooking flange by the rotating operation at the lower portion of the air-exhausting grill, and furthermore, the magneto joint plate is absorbed to the magneto fixing plate. As a consequence, the air-exhausting grill 8 can be simply mounted and also can be easily mounted without using any tool, the user need not mount/dismount the air-exhausting grill 8 while the user steps on the stand, resulting in safety mount of the air-exhausting grill 8. Also, since the air-exhausting grill 8 can be mounted/dismounted in an easy and quick manner, such a clean appliance can be provided with easy cleaning work.
Furthermore, as previously described, in the high frequency heating apparatus of the present invention, as such an appliance in which the outer housing is arranged by the U-shaped body and the flat upper lid and which is hung from the cabinet shelf, the joint can be eliminated from the lower portion of the appliance main body, fastening by the screw can be avoided, and dirt caused by oil and smoke components supplied from the lower gas burner can be simply wiped away due to the U-shaped integral body. As a result, the clean characteristic of this U-shaped body can be secured, and since the disturbing articles such as the joint and the screw are eliminated, the wind-cutting sound and the resistance of the air exhaust path can be reduced, so that the ventilation efficiency can be improved under low noise. Furthermore, when the high frequency heating apparatus is mounted on the cabinet self, such a smart design of the U-shaped body having no joint and no screw can be provided. Then, when the electronic components are repaired, while the U-shaped main body of the high frequency heating apparatus remains stationary, these troubled electronic components can be repaired and/or replaced by the normal electronic components by merely removing the upper lid. As a consequence, the repairing steps can be decreased and the service characteristic can be improved.
| Number | Date | Country | Kind |
|---|---|---|---|
| P.2001-369836 | Dec 2001 | JP | national |
| P.2002-135155 | May 2002 | JP | national |
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|---|---|---|---|
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| 5534681 | Hwang | Jul 1996 | A |
| 5886328 | Yun | Mar 1999 | A |
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| 6512214 | Jeong et al. | Jan 2003 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20030111464 A1 | Jun 2003 | US |
