Patent Grant
8558125
The present invention relates to a button-key structure and an electric device having the button-key structure. More specifically, the present invention relates to a button-key structure disposed in an operation panel of an electric device such as a copier, a printer, a facsimile, a personal computer, a telephone, a game machine, and the likes.
A conventional operation panel of an electric device such as a copier, a printer, a facsimile, a personal computer, a telephone, a game machine, and the likes is provided with various button-keys for operating the electric device. The button-keys include a selection key for receiving a selection of various settings of the electric device; an input key for receiving an input; and a back key for receiving an input for retuning to a previous process. The various button-keys with different functions are generally arranged with next to each other in view of a design or a function. Further, the various button-keys are connected to a frame through an elastic arm, thereby being supported (refer to Patent Reference).
Patent Reference: Japanese Patent Publication No. 2001-236852
In the conventional operation panel with the button-keys described above, when a user pushes one of the button-keys, another of the button-keys arranged adjacent to the one of the button-keys may inadvertently moves and contacts due to deformation of the elastic arm. Accordingly, the one of the button-keys may not properly contact with a switch disposed below the one of the button-keys.
In view of the problems described above, an object of the present invention is to provide a button-key structure and an electric device having the button-key structure capable of solving the problems. In the button-key structure, it is possible to push a button-key in a wide range of a downward direction. Accordingly, even when the button-key is pushed down in an oblique direction, it is possible to smoothly push the button-key without moving or interfering with another button-key arranged next to the button-key.
Further objects and advantages of the invention will be apparent from the following description of the invention.
In order to attain the objects described above, according to a first aspect of the present invention, a button-key structure includes a plurality of button-keys arranged next to each other and a button-key supporting portion disposed on a downstream side in a direction that the button-keys move. The button-key supporting portion includes a guide portion disposed between the button-keys in parallel to the direction that the button-key move.
According to a second aspect of the present invention, an electric device includes a button-key structure. The button-key structure includes a plurality of button-keys arranged next to each other and a button-key supporting portion disposed on a downstream side in a direction that the button-keys move. The button-key supporting portion includes a guide portion disposed between the button-keys in parallel to the direction that the button-key move.
According to a third aspect of the present invention, a button-key structure includes a first button-key arranged to be movable in a first direction; a second button-key arranged adjacent to the first button-key to be movable in the first direction; and a button-key supporting portion disposed on a downstream side of the first button-key and the second button-key in the first direction. The button-key supporting portion includes a wall portion disposed between the first button-key and the second button-key and extending in the first direction.
In the button-key structure of the present invention, it is possible to push the button-key in a wide range of a downward direction. Accordingly, even when the button-key is pushed down in an oblique direction, it is possible to smoothly push the button-key without moving or interfering with another button-key arranged next to the button-key.
In the electric device having the button-key structure of the present invention, it is possible to push the button-key in a wide range of a downward direction. Accordingly, even when the button-key is pushed down in an oblique direction, it is possible to smoothly push the button-key without moving or interfering with another button-key arranged next to the button-key.
a) and 9(b) are views showing an entire supporting structure of the button-key structure according to the first embodiment of the present invention;
a) is a view showing the button-key structure according to the second embodiment of the present invention; and
b) showing an entire supporting structure of the button-key structure taken along a line 19-19′ in
Hereunder, embodiments of the present invention will be explained with reference to the accompanying drawings.
First Embodiment
A first embodiment of the present invention will be explained. In the following description, a printer 101 will be explained first as an electric device having a button-key structure of the present invention. Then, the button-key structure will be explained.
As shown in
In the embodiment, the printer 101 further includes the image forming units 108 (108K, 108Y, 108M, 108C) having photosensitive drums 107 (107K, 107Y, 107M, 107C) for forming developer images according to input print data; LED (Light Emitting Diodes) heads 109 (109K, 109Y, 109M, 109C) for forming static latent images on surfaces of the photosensitive drums 107 (107K, 107Y, 107M, 107C); a transfer belt 110 for attaching the sheet through static electricity and transporting the sheet in an arrow direction Y; transfer rollers 111 (111K, 111Y, 111M, 111C) for transferring the developer images formed in the image forming units 108 (108K, 108Y, 108M, 108C) to the sheet; and a belt idle roller 112 and a belt drive roller 113 for driving the transfer belt 110.
In the embodiment, the printer 101 further includes a fixing unit 116 having a fixing roller 114 and a backup roller 115 for applying heat and pressure to the sheet transported with the transfer belt 110 to fix the developer images thus transferred; a discharge roller 117 for discharging the sheet passing through the fixing unit 116 to outside the printer 101; a sheet stacker 118 for placing the sheet discharged with the discharge roller 117; a waste toner box 119 for collecting toner as developer remaining on the transfer belt 110; and an operation panel 120 for receiving an operation input of the printer 101 from an operator. Each component described above except the operation panel 120 is arranged along a sheet transportation path formed substantially in an S character shape.
In the embodiment, the sheet cassette 102 is detachably attached to a lower portion of the printer 101, so that the sheet cassette 102 retains the sheet in a stacked state. The sheet supply roller 103 is disposed at an upper portion of the sheet cassette 102 for separating and picking up the sheet one by one. The sheet supply roller 103 is arranged at a start end side of the sheet transportation path. A drive source (not shown) drives the sheet supply roller 103 to rotate, so that the sheet picked up from the sheet cassette 102 is transported in the arrow direction X.
In the embodiment, the inlet sensor 104 detects a leading edge of the sheet, and notifies a detection result to a print control unit (not shown). The inlet sensor 104 is not limited to any particular sensor, and may be formed of a photo interrupter of a light transmission type or a light reflection type.
In the embodiment, the transport roller 105 is provided for correcting skew of the sheet. Further, a drive source (not shown) drives the transport roller 105 to rotate, so that the sheet is transported to the image forming units 108 (108K, 108Y, 108M, 108C).
In the embodiment, similar to the inlet sensor 104, the writing sensor 106 detects the leading edge of the sheet, and notifies a detection result to the print control unit (not shown). When the print control unit receives the detection result, the print control unit controls the image forming units 108 (108K, 108Y, 108M, 108C) to start forming an image.
In the embodiment, each of the photosensitive drums 107 (107K, 107Y, 107M, 107C) is formed of a conductive supporting member and a photo conductive layer. More specifically, each of the photosensitive drums 107 (107K, 107Y, 107M, 107C) is an organic photosensitive member, in which a charge generation layer and a charge transportation layer as the photo conductive member are sequentially laminated on a metal pipe formed of aluminum as the conductive supporting member. A charge roller (not shown) uniformly charges a surface of each of the photosensitive drums 107 (107K, 107Y, 107M, 107C), so that the LED heads 109 (109K, 109Y, 109M, 109C) irradiate to form the static latent images.
In the image forming units 108 (108K, 108Y, 108M, 108C), the static latent images are formed on the surfaces of the photosensitive drums 107 (107K, 107Y, 107M, 107C). Then, the static latent images are developed with developer or toner corresponding to four colors of black (K), yellow (Y), magenta (M), and cyan (C), thereby forming the developer images.
In the embodiment, the image forming units 108 (108K, 108Y, 108M, 108C) include the photosensitive drums 107 (107K, 107Y, 107M, 107C), respectively. Further, the image forming units 108 (108K, 108Y, 108M, 108C) include the charge rollers for uniformly charging the surfaces of the photosensitive drums 107 (107K, 107Y, 107M, 107C); developing rollers for supplying toner to the photosensitive drums 107 (107K, 107Y, 107M, 107C); and toner supply rollers for supplying toner to the developing rollers. The image forming units 108 (108K, 108Y, 108M, 108C) are detachably arranged over the transfer belt 110 along the sheet transportation path.
In the embodiment, each of the LED heads 109 (109K, 109Y, 109M, 109C) includes an LED light emitting element and a lens array. The LED heads 109 (109K, 109Y, 109M, 109C) are arranged to irradiate the surfaces of the photosensitive drums 107 (107K, 107Y, 107M, 107C) according to the input print data, thereby forming the static latent images.
In the embodiment, the transfer belt 110 is an endless belt member for attaching and transporting the sheet. The belt idle roller 112 and the belt drive roller 113 extend end portions of the transfer belt 110. A drive source (not shown) drives the belt drive roller 113 to rotate, so that the transfer belt 110 moves in the arrow direction Y to transport the sheet.
In the embodiment, each of the transfer rollers 111 (111K, 111Y, 111M, 111C) is formed of a metal shaft and a semi-conductive rubber layer of an epichlorohydrin rubber and the likes. The transfer rollers 111 (111K, 111Y, 111M, 111C) are arranged to contact with the surfaces of the photosensitive drums 107 (107K, 107Y, 107M, 107C) through the transfer belt 110. When the transfer belt 110 moves, the transfer rollers 111 (111K, 111Y, 111M, 111C) rotate.
Further, a transfer roller power source (not shown) is connected to the transfer rollers 111 (111K, 111Y, 111M, 111C) for applying a bias voltage with a polarity opposite to that of toner. When the transfer roller power source (not shown) applies the bias voltage, the transfer rollers 111 (111K, 111Y, 111M, 111C) transfer the developer images formed on the photosensitive drums 107 (107K, 107Y, 107M, 107C) to the sheet.
In the embodiment, the fixing roller 114 and the backup roller 115 constitute a roller pair of the fixing unit 116. After the sheet passes through the image forming units 108 (108K, 108Y, 108M, 108C), the fixing unit 116 applies heat and pressure to toner on the sheet, thereby fixing the developer images. The fixing roller 114 is formed of a core shaft with a hollow cylindrical shape formed of aluminum; a heat resistant elastic layer formed of a silicone rubber and disposed on the core shaft; and a PFA (tetrafluoro perfluoroalkylvinylether copolymer) tube disposed on the heat resistant elastic layer. A heating heater such as a halogen lamp is disposed in the core shaft.
In the embodiment, the backup roller 115 is formed of a core shaft formed of aluminum; a heat resistant elastic layer formed of a silicone rubber and disposed on the core shaft; and a PFA tube disposed on the heat resistant elastic layer. The fixing roller 114 is pressed against the backup roller 115 to form a pressing portion. After the transfer rollers 111 (111K, 111Y, 111M, 111C) transfer the developer images to the sheet, when the sheet passes through the pressing portion, heat and pressure are applied to the sheet, thereby fixing the developer images.
In the embodiment, a drive source (not shown) drives the discharge roller 117 to rotate, so that the discharge roller 117 discharges the sheet to the sheet stacker 118 after the sheet passes through the fixing unit 116. The sheet stacker 118 is formed using an housing outer surface of the printer 101, and retains the sheet discharged from the discharge roller 117.
In the embodiment, the waste toner box 119 includes a cleaning blade (not shown) for scraping off toner remaining on the transfer belt 110, so that the waste toner box 119 collects waste toner collected from the transfer belt 110. The operation panel 120 is disposed on a front surface of the transfer belt 110, and functions as an interface for receiving an operation input of the printer 101 from an operator. The operation panel 120 will be explained in more detail later.
In the embodiment, in addition to the components described above, the printer 101 further includes the print control unit having a microprocessor, an ROM (Read Only Memory), an RAM (Random Access Memory), an input-output port, a timer, and the likes; an interface control unit for receiving print data and a control command and controlling an entire sequence of the printer 101 to perform a printing operation; and various sensors such as a temperature-humidity sensor and a density sensor for monitoring an operational state of the printer 101.
Further, the printer 101 includes a head drive control unit for controlling drive of the LED heads 109 (109K, 109Y, 109M, 109C); a temperature control unit for controlling a temperature of the fixing unit 116; a sheet transportation motor control unit for controlling a drive motor as a drive source for rotating each roller to transport the sheet; a drive control unit for controlling a drive motor for rotating each roller of the image forming units 108 (108K, 108Y, 108M, 108C); and a power source for applying a voltage to each roller.
With the configuration described above, according to an instruction that the operator inputs through the operation panel 120, the printer 101 is capable of forming an image of the print data thus received on the sheet.
A button-key structure of the operation panel 120 will be explained next.
As shown in
Further, the operation panel 120 includes an upper menu key 208 and a lower menu key 209 for the operator to push when the operator selects a print number and a setting of the sheet for the printing operation of the printer 101; an enter key 210 for the operator to push when the operator confirms the selection of the print number and the setting of the sheet selected with the upper menu key 208 and the lower menu key 209; and a back key 211 for the operator to push when the operator chooses to change a display screen on the display portion 201 from a current step to a previous step.
In the embodiment, a case member 205 as a cover member covers the display portion 201 and the button-keys such as the online key 206 and the likes. Further, the upper menu key 208, the lower menu key 209, the enter key 210, and the back key 211 are arranged in one single location next to each other.
As shown in
Components of the button-key structure will be explained. As shown in
The button-keys will be explained next in more detail. Each of the button-keys has a similar structure, and the upper menu key 208 and the lower menu key 209 will be explained as an example with reference to
As shown in
In the embodiment, each of the upper menu key 208 and the lower menu key 209 further includes a protruding portion 227 on a contact surface 250 thereof for covering an upper portion of an adjacent component guide 218 of the button-key supporting portion 217 (described later). The contact surface 250 of each of the upper menu key 208 and the lower menu key 209 is formed in an arc shape similar to an outer shape of the case member 205.
In the embodiment, each of the upper menu key 208 and the lower menu key 209 further includes a sliding rib 234 at a lower portion of a button outer wall 224, and the sliding rib 234 has a surface flush with the button outer wall 224. Each of the upper menu key 208 and the lower menu key 209 further includes a flange portion 223 at an obliquely upper portion of the push-up portion 222, and the flange portion 223 functions as an abutting portion for abutting against the case member 205 through an elastic force of the push-up arm 220 of the button-key supporting portion 217 applied to the push-up portion 222.
As shown in
In the embodiment, the button-key supporting portion 217 further includes through holes 219 and the push-up arms 220. As shown in
In the embodiment, the adjacent component guide 218 is arranged such that a surface of the adjacent component guide 218 extends in parallel to a direction that the switches 235 of the circuit board 204 are pushed, so that the button outer walls of the button-keys such as the upper menu key 208 and the lower menu key 209 slide against the surface of the adjacent component guide 218 to move the button-keys in parallel to the direction that the switches 235 of the circuit board 204 are pushed.
As shown in
In the embodiment, similar to the adjacent component guide 218, the button guide 226 is arranged such that a surface of the button guide 226 extends in parallel to the direction that the switches 235 of the circuit board 204 are pushed, so that the button inner walls of the button-keys such as the upper menu key 208 and the lower menu key 209 slide against the surface of the button guide 226 to move the button-keys in parallel to the direction that the switches 235 of the circuit board 204 are pushed. The button guide 226 includes sandwiching portions 226a as branch portions thereof extending from the adjacent component guide 218 in the direction that the switches 235 are pushed, so that the button guide 226 sandwiches the button inner walls of the button-keys.
As shown in
In the embodiment, the button-keys are arranged such that the button-keys are away from the adjacent component guide 218 and the button guide 226 of the button-key supporting portion 217, so that the button-keys move toward the switches 235. Accordingly, depending on a pushing direction, the button-keys may move in a direction other than toward the switches 235. To this end, the space t is set so that the button-keys arranged next to each other do not contact with each other regardless of the pushing direction.
In particular, in the embodiment, the adjacent component guide 218 is arranged between the button-keys arranged next to each other, so that the adjacent component guide 218 restricts one of the button-keys arranged next to each other from moving toward another of the button-keys arranged next to each other. Accordingly, it is possible to prevent one of the button-keys arranged next to each other from contacting with another of the button-keys to be pushed when one of the button-keys arranged next to each other is pushed.
Further, in the embodiment, the sandwiching portions 226a of the button guide 226 and the adjacent component guide 218 sandwich the button inner walls of the button-keys to prevent the button-keys from being inclined toward the pushing direction. Accordingly, it is possible to move the button-keys linearly toward the switches 235 to be pushed. As a result, it is possible to minimize the space between the button keys and the space t.
In the embodiment, the through holes 219 function as a moving space for the push-up arms 220 to freely deform when the push-up arms 220 abut against the push-up portions 222 disposed at the lower portions of the upper menu key 208 and the lower menu key 209 at specific positions. As shown in
In the embodiment, the push-up arms 220 extend from a base portion of the adjacent component guide 218 toward the flange portions 223 of the upper menu key 208 and the lower menu key 209. As described above, the flange portions 223 are arranged to abut against a circumferential edge of the button hole 233 of the case member 205 from inside. Accordingly, when the push-up arms 220 abut against the push-up portion 222 at the effective points 221, the push-up arms 220 deform. A deformation amount of the push-up arms 220 is not limited to any specific level, and is set to 0.2 mm in the embodiment in consideration of mechanical strength of the push-up arms 220 and pushing feeling with respect to the operator.
The entire supporting structure of the button-key structure will be explained with reference to
As shown in
In the embodiment, the button-keys are arranged with the specific space therebetween through the adjacent component guide 218. It is possible to adjust the space t between the button-keys through adjusting dimensions of the adjacent component guide 218 and the button outer walls 224. The space t is set to 0.8 mm in the embodiment.
As shown in
As described above, the switches 235 are disposed on the circuit board 204 at the positions corresponding to the button-keys. As shown in
As shown in
An operation of the button-key structure will be explained next. When the operator selects the print number or the setting of the sheet, the operator pushes one of the upper menu key 208, the lower menu key 209, the enter key 210, and the back key 211 on the operation panel 120 shown in
As shown in
When the operator pushes the upper menu key 208 in the direction B, the upper menu key 208 rotates in the arrow direction D around the effective point 221 due to the elastic force applied to the push-up portion 222 at the effective point 221 of the push-up arm 220. As a result, the button inner wall 225 abuts against the button guide 226 and the button outer wall 224 abuts against the adjacent component guide 218, and the upper menu key 208 moves along the surface of the adjacent component guide 218, so that the pressing portion 212 pushes the switch 235.
When the operator pushes the lower menu key 209 in the direction B, the lower menu key 209 rotates in the arrow direction E around the effective point 221 due to the elastic force applied to the push-up portion 222 at the effective point 221 of the push-up arm 220. As a result, the button outer wall 224 and the sliding rib 234 abut against the adjacent component guide 218, and the lower menu key 209 moves along the surface of the adjacent component guide 218, so that the pressing portion 212 pushes the switch 235.
In the embodiment, when the operator pushes one of a left end portion and a right end portion of the upper menu key 208, the upper menu key 208 moves in a way similar to that of the lower menu key 209. Further, the enter key 210 or the back key 211 moves in a way similar to that of the lower menu key 209.
As described above, in the embodiment, the push-up arm 220 for pushing up the button-key is arranged to protrude from the end portion of the adjacent component guide 218 of the button-key supporting portion 217 in the direction that the button-key moves, or toward just below the button-key.
In general, when a button-key with the configuration described above is pushed from above, the button-key rotates around a base portion of the push-up arm 220. In the embodiment, the flange portion 223 is provided on the surface opposite to the surface contacting with the adjacent component guide 218 (the base portion of the push-up portion 222) for abutting against the inner surface of the case member 205. Further, the push-up portion 222 of the push-up arm 220 is arranged near just below the flange portion 223. Accordingly, when the button-key is pushed, the button-key rotates around the flange portion 223 relative to the case member 205.
Accordingly, with the combination of the rotational directions of the push-up arm 220 and the flange portion 223 described above, the push-up arm 220 and the flange portion 223 generate the force for guiding the button-key toward the corresponding switch even when the operator pushes the button-key in any directions. As a result, it is possible to linearly move the button-key relative to the circuit board 204, thereby smoothly pushing the switch 235 on the circuit board 204.
In the embodiment, information according to pushing down the switch is transmitted to the print control unit (not shown) of the printer 101 through the circuit board 204. Then, the print control unit (not shown) controls each component constituting the printer 101 to perform the printing operation according to the setting of the operator.
As described above, in the button-key structure in the embodiment, it is possible to push the button-key in a wide range. When the operator pushes the button-key in any directions, the button-key moves along the surface of the button-key supporting portion 217 toward the switch 235 on the circuit board 204. Accordingly, the button-key thus pushed does not interfere with the adjacent button-key, thereby making it possible to smoothly push the button-key. Further, the sliding rib of the button-key contacts with the button-key supporting portion 217 over a small area, thereby reducing contact resistance and a pushing load during the operation.
Further, in the embodiment, it is possible to image operational feeling upon pushing the button-key and maintain the contact surface on one single surface due to the elastic force applied with the push-up arm 220 of the button-key supporting portion 217. Further, the button-keys are arranged within the plan view projected area (depth D×width W) similar to the surface area of the button-key supporting portion 217. Accordingly, it is possible to arrange the button-keys with a maximum dimension within a mounting area even when the operation panel 120 has a minimum area.
Further, in the embodiment, the button-keys are arranged in a separated independent arrangement, not in an integrated see-saw arrangement, thereby making it possible to concurrently push a plurality of the button-keys. Accordingly, it is possible to select a function through concurrently pushing a plurality of the button-keys such as a special function or a maintenance mode invisible to a general user.
Further, in the embodiment, it is possible to integrally produce the button-key supporting portion 217 and the button-keys as a single part integrated through the frame 236. Accordingly, it is possible to handle the button-keys as a single part just before assembly, thereby reducing the number of steps in parts assembly or maintenance. Further, the button-keys are produced as a single part using a material in a single lot. Accordingly, it is possible to reduce a cost of a mold. Further, it is possible to prevent mismatch in color that tends to occur due to different lots when the button-keys are produced separately. Further, it is possible to easily match color of the button-keys arranged next to each other.
Second Embodiment
A second embodiment of the present invention will be explained. A button-key structure in the second embodiment is similar to that in the first embodiment. Only difference from the first embodiment will be explained.
The button-keys will be explained next. Each of the button-keys has a similar structure, and an upper menu key 208′ and a lower menu key 209′ will be explained as an example with reference to
As shown in
In the embodiment, in addition to the components in the first embodiment, a button-key supporting portion 217′ includes fixing holes 301 at a base portion of a button guide 226′ of an adjacent component guide 218′ for engaging the protruding portions 302 of the upper menu key 208′ and the lower menu key 209′. Further, the button-key supporting portion 217′ includes slit portions 303 as a moving space for the protruding portions 302 to freely deform.
An operation of the button-key structure will be explained next. In the following description, an operation of attaching the button-keys to the button-key supporting portion 217′ will be explained.
When the upper menu key 208′ and the lower menu key 209′ are installed in the adjacent component guide 218′ of the button-key supporting portion 217′, the protruding portion 302 of the upper menu key 208′ or the lower menu key 209′ abuts against the adjacent component guide 218′. Accordingly, the protruding portion 302 is inserted while deforming toward the slit portion 303.
Just before the upper menu key 208′ is the lower menu key 209′ is inserted into a standard position, the protruding portion 302 reaches the fixing hole 301. Then, the deformation of the protruding portion 302 due to abutting against the adjacent component guide 218′ is released, so that the protruding portion 302 engages the fixing hole 301.
In the embodiment, the button-keys have the protruding portions 302, and the button-key supporting portion 217′ includes the slit portions 303. Alternatively, the button-keys may have the slit portions 303, and the button-key supporting portion 217′ includes the protruding portions 302.
The operation of the button-key structure is substantially the same as that in the first embodiment, and an explanation thereof is omitted. In the second embodiment, the push-up arm 220 and the flange portion 223 generate the force for guiding the button-key toward the corresponding switch even when the operator pushes the button-key in any directions. As a result, it is possible to linearly move the button-key relative to the circuit board 204, thereby smoothly pushing the switch 235 on the circuit board 204.
As described above, in the second embodiment, the protruding portion 302 engages the fixing hole 301, so that the button-key does not come off the button-key supporting portion 217′. Accordingly, it is possible to prevent the button-key from coming off during the assembly process, thereby improving operation efficiency during the assembly process.
In the embodiments described above, the button-key structure has four button-keys, and the invention is not limited thereto. Further, the button-keys arranged next to each other are separated into four pieces having an oval shape, and are not limited thereto. As far as the button-keys are arranged next to each other, the button-keys may have any shape.
Further, in the embodiments described above, the operation panel of the printer is explained as an example. The present invention is applicable to other electric devices such as a copier, a facsimile, a personal computer, a telephone, a game machine, and the likes.
The disclosure of Japanese Patent Application No. 2008-289478, filed on Nov. 12, 2008, is incorporated in the application by the reference.
While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2008-289478 | Nov 2008 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5172114 | Bedoya et al. | Dec 1992 | A |
| 7332681 | Wohlfart | Feb 2008 | B2 |
| Number | Date | Country |
|---|---|---|
| 60-110933 | Jul 1985 | JP |
| 2001-236852 | Aug 2001 | JP |
| 2002-324454 | Nov 2002 | JP |
| 3105098 | Aug 2004 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20100116637 A1 | May 2010 | US |
