Electronic device

An electronic device includes a housing having an accommodation space, a first support body being slidably insertable into the accommodation space in parallel with a predetermined plane, a second support body coupled with the first support body rotatably around a rotation axis parallel to a front side of the housing and being rotatable between a reference attitude disposed in the same plane with respect to the first support body and an inclined attitude disposed at a given angle with respect to the first support body, and a drive mechanism for changing the attitude of the second support body.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2009-235429, filed on Oct. 9, 2009, the entire contents of which are incorporated herein by reference.

FIELD

The embodiments discussed herein are related to a technology for an electronic device.

BACKGROUND

Conventionally, for example, a storage blade is mounted in a rack of a server computer apparatus. A plurality of hard disk drives (HDDs) are inserted into a housing of the storage blade from front side of the housing in parallel. A front end of the HDD is received by an assisted panel that extends upward in parallel with the front side of the housing. For example, two control units that control the HDDs are inserted into the housing in parallel with the HDDs. Each of the control units includes a printed circuit board on which a connector is mounted at a front end of the printed circuit board. When the control unit is inserted into the housing from the front end of the control unit, the connector of the printed circuit board is received by a back panel that extends upward in parallel with the back side of the housing. An interconnecting board connects the back panel to the assisted panel. As a result, the HDDs are controlled by an electronic circuit component which is mounted on the printed circuit board.

Japanese Laid-open Patent Publication No. 9-171874 and No. 2008-47019 are examples in conventional technique.

The storage blade is connected to the large back panel arranged in the rack of the server computer apparatus. A connector which is mounted on the back panel in the housing of the storage blade is used to connect the storage blade to the large back panel. The connector is received by the large back panel. With the arrangement of the connector, a predetermined depth of the housing is secured. That is, the depth of the housing is determined according to the depth of the rack of the server computer apparatus. On the other hand, the depth of the HDD from the front side of the housing is smaller than the depth of the housing. As a result, a dead space is formed between the back side of the assisted panel and the back panel.

SUMMARY

According to an aspect of the invention, an electronic device includes a housing having an accommodation space, a first support body being slidably insertable into the accommodation space in parallel with a predetermined plane, a second support body coupled with the first support body rotatably around a rotation axis parallel to a front side of the housing and being rotatable between a reference attitude disposed in the same plane with respect to the first support body and an inclined attitude disposed at a given angle with respect to the first support body, and a drive mechanism for changing the attitude of the second support body from the reference attitude to the inclined attitude in the accommodation space, upon the first support body being inserted into the accommodation space.

DESCRIPTION OF EMBODIMENT

Hereafter, an electronic device according to an embodiment is described in detail with reference to the accompanying drawings.

FIG. 1schematically illustrates a perspective view of a server computer apparatus11as an example of one embodiment of an apparatus mounting a plurality of electronic devices. The server computer apparatus11includes a rack12that is disposed on the floor face that extends along a horizontal plane. The rack12mounts a plurality of the electronic device13. The electronic device13, for example, is formed in a vertically-elongated box shape in a direction perpendicular to the horizontal plane. The electronic device13, for example, is a server blade or a storage blade. The various data are transmitted and received between the server blades or between the server blade and the storage blade. The storage blade operates on the basis of the instruction of the server blade. This server computer apparatus11is connected to, for example, the RAID (Redundant Arrays Inexpensive Disks).

FIG. 2schematically illustrates a perspective view of an electronic device13that is removed forward from a rack12of the server computer apparatus11. Refer also toFIG. 2. A storage rack14that accommodates the electronic device13is disposed in the rack12. The storage rack14extends along the horizontal plane. For example, a guide member (not illustrated) that extends in front-back direction of the rack12is fixed on the storage rack14. The electronic device13is slidably inserted into or removed from the rack12along the horizontal plane from the front side of the rack12that extends in a vertical direction according to the operation of the guide member. A main back panel described later is disposed at the back side of the rack12that extends in a vertical direction. The main back panel is disposed in the rack12. The main back panel keeps in a vertical attitude that extends in a vertical direction in parallel with the front side of the rack12. When the electronic device13is inserted into the storage rack14, the connector of the back side of the electronic device13is connected to the connector of the main back panel.

FIG. 3schematically illustrates a perspective view of a structure of the electronic device13. As illustrated inFIG. 3, the storage blade, that is, the electronic device13includes a housing16that is formed in a box shape. A back side of the housing16is received by a main back panel17that is disposed in the rack12. A plurality of storage device units18are accommodated in the accommodating space of the housing16. Each of the storage device units18keeps a horizontal attitude that extends along a horizontal plane. The storage device units18in the horizontal attitude are arranged in a vertical direction. The each storage device unit18is slidably inserted into or removed from the accommodating space along the horizontal plane through an insertion port19that is formed in the front side of the housing16. The storage device unit18is guided by, for example, guide rails (not illustrated) that are secured on the inner surface of side walls16aof the housing16. The side walls16aextend in parallel with each other.

In the accommodating space of the housing16, a respective control board unit21is accommodated on the uppermost storage device unit18and under the lowermost storage device unit18. One of the control board units21controls a plurality of the HDDs22. The redundancy is secured by the two control board units21. The control board unit21that arranged on the uppermost storage device unit18is disposed along a top plate16bof the housing16. The control board unit21that arranged under the lowermost storage device unit18is disposed along a bottom plate16cof the housing16. The top plate16band the bottom plate16cextend in parallel with each other. The control board unit21keeps a horizontal attitude that extends along in the horizontal plane. The control board unit21is slidably inserted into or removed from the accommodating space through the insertion port19that is formed in the front side of the housing16along the horizontal plane.

FIG. 4schematically illustrates a transparent perspective view of a structure of the electronic device13. As illustrated inFIG. 4, the storage device unit18includes a hard disk drive (HDD)22as an example of a storage device. A rotation shaft of a magnetic disk as an example of a storage medium in the HDD22is provided in vertical direction perpendicular to the horizontal plane. The storage device unit18includes an ejector unit23that is disposed on the rear end of the HDD22. The ejector unit23, for example, is disposed in the insertion port19. The front end of the HDD22is received by an assisted panel such as a front panel24. The front panel24keeps a vertical attitude that extends in a vertical direction parallel to the front side of the housing16. For example, the front panel24is fixed to the side walls (16a,16a). For example, the front panel24is made of a plastic board.FIG. 5schematically illustrates a transparent side view of a structure of the electronic device13. Refer also toFIG. 5. A connector (not illustrated) provided on the front end of the HDD22is connected to a connector that is provided on the front surface of the front panel24. Thus the HDD22is connected to the front panel24.

A back panel26that extends in parallel with the front panel24is disposed in the back of the housing16. For example, the back panel26is made of a plastic board. A predetermined accommodating space is provided between the back panel26and the front panel24. A rear connector27is mounted on the back side of the back panel26. The rear connector27is connected to a connector28that is mounted on the main back panel17of the server computer apparatus11. An interconnecting board29is disposed in the accommodating space between the back panel26and the front panel24. For example, the interconnecting board29is a flexible printed circuit board. The interconnecting board29extends in parallel with the side wall16a. The interconnecting board29is provided so that the distance between the top plate16band the interconnecting board29is equal to the distance between the bottom plate16cand the interconnecting board29. The side walls (16a,16a) are located at the same distance from the interconnecting board29.

FIG. 5schematically illustrates a transparent side view of a structure of the electronic device13. As illustrated inFIG. 5, a connector31and a connector32are mounted on a rear end and a front end of the interconnecting board29, respectively. The connector31is connected to a connector33that is mounted on the back side of the front panel24. The connector32is connected to a connector34that is mounted on the front side of the back panel26. Thus the front panel24and the back panel26are connected through the interconnecting board29. The HDD22is connected to the back panel26and the main back panel17. As a result, for example, when the server blade issues a read instruction or a write instruction to the electronic device13through the main back panel17, the read instruction or the write instruction is given to the each HDD22trough the back panel26, the interconnecting board29and the front panel24.

The control board units21are formed into the same shape. In this embodiment, one of the control board units21is disposed to be upside down relative to the other control board unit21. As a result, the control board units21are disposed in symmetry with respect to a centerline extending in front-back direction of the housing16on a virtual plane that is located at the same distance from the top plate16band the bottom plate16cand extends in parallel with the horizontal plane. The centerline is located at the same distance from the side walls (16a,16a). Therefore when the upper control board unit21is changed for the lower control board unit21, the each control board unit21may be similarly accommodated in the housing16. And the one of the control board units21operates similarly to the other control board unit21.

The each control board unit21includes a first support body41that extends from the front side to the back side of the housing16. The first support body41is disposed on the top plate16bor the bottom plate16c. The first support body41includes a bottom plate41athat extends along the horizontal plane and a pair of side plates41bthat upstand from the side ends of the bottom plate41a, which are located between the front end and the rear end of the bottom plate41a. The bottom plate41aand the side plates41bare made of a metal plate such as a sheet metal. The ejector unit23is fixed on the rear end of the first support body41. For example, the side plate41bincludes a pair of guide components such as a pair of guide pins42that project from the outer surface of the side plate41b. For example, the guide pin42is formed into a circular cylindrical shape. As illustrated inFIG. 5, the central axis of the guide pin42is located in a virtual plane43parallel to the horizontal plane. Therefore the bottom plate41ais located in parallel with the virtual plane43.

FIG. 6schematically illustrates a perspective view of a structure of the control board unit21. The each control board unit21includes a second support body44. The rear end of the second support body44is coupled with the front end of the first support body41. The second support body44includes a bottom plate44aand a pair of side plates44bas well as the first support body41. The side plates44bupstand from the side ends of the bottom plate44athat are located between the front end and the rear end of the bottom plate44a. The bottom plate44aand the side plates44bare made of a metal plate such as a sheet metal. For coupling with the first support body41, the second support body44includes support shafts45that projects from the inner surface of the side plates44b.FIG. 6schematically illustrates a perspective view of a structure of the control board unit. Refer also toFIG. 6. The support shafts45are inserted through holes46that are formed on the side plates41b. The central axis of the support shaft45is coincident with the central axis of rotation axis47. The rotation axis47is located in parallel with the insertion port19on the virtual plane43. The rotation axis47is perpendicular to the side wall16a. Thus the second support body44is rotatably coupled with the first support body41about the rotation axis47. Therefore the central axis of the guide pin42is located in parallel with the rotation axis47.

The second support body44intersects with the first support body41, for instance, at an intersection angle alpha that is greater than 0 degrees and smaller than or equal to 180 degrees about the rotation axis47. For instance, the intersection angle alpha is specified between a plane including the surface of bottom plate41aand a plane including the surface of bottom plate44a. When the intersection angle alpha is set to 180 degrees, the first support body41is disposed coplanar with the second support body44as illustrated inFIG. 6. Thus, the first support body41and the second support body44keep a horizontal attitude, that is, a reference attitude. When the intersection angle alpha is set smaller than 180 degrees, the first support body41and the second support body44keeps an inclined attitude. As illustrated inFIGS. 4 and 5, when the control board unit21is disposed in the accommodated position in the accommodation space of the housing16, the second support body44keeps the inclined attitude that intersects, for instance, with the first support body41at the intersection angle alpha of 30 degrees.

The width of bottom plate41aof the first support body41that is located in a parallel with the rotation axis47is set equally to the width of bottom plate44aof the second support body44that is similarly located in a parallel with the rotation axis47. The height of the side plate41bmeasured from the bottom plate41aagrees with the height of the side plate44bmeasured from the bottom plate44a. The distance between the front end and the rear end of the bottom plate41ais set larger than the distance between the front end and the rear end of the bottom plate44a. For instance, the distance of bottom plate41ais set to the distance of more than twice the distance of the bottom plate44a. A guide pin48that projects from the outer surface of the side plate44bof the second support body44is formed. For instance, the guide pin48is formed into a circular cylindrical shape. The guide pin48has a central axis parallel to the central axis of the guide pin42. The guide pin48is set to the same size as the guide pin42. The central axis of the guide pin48is located in parallel with the rotation axis47as well as the guide pin42.

A first printed circuit board51is supported on the bottom plate41aof the first support body41as illustrated inFIG. 4andFIG. 6. The first printed circuit board51is fixed to the bottom plate41a. Similarly, a second printed circuit board52is supported on the bottom plate44aof the second support body44. The second printed circuit board52is fixed to the bottom plate44a. For instance, electronic circuit elements (not illustrated) such as a RAID controller or CPU (central processing unit) are mounted on the surface of the first printed circuit board51and on the surface of the second printed circuit board52. The electronic circuit element issues a read instruction or a write instruction to each of the HDDs22. The first printed circuit board51and the second printed circuit board52are interconnected, for instance, by a flexible printed circuit board53.

The second support body44has a slit54that is cut at a portion extending from a front end toward a rear end of the bottom plate44a. For instance, the slit54is set to an equal distance from the side plates (44b,44b). The second printed circuit board52that is mounted on the bottom plate44ahas the slit55that has the same outline as the slit54. On the other hand, the connector56is mounted on the front side of the first printed circuit board51. The connector56is provided outside the rotational orbit of the rear end of the bottom plate44aof the second support body44about the rotation axis47. As a result, the connector56does not interfere with a relative rotation of the second support body44relative to the first support body41. The connector56is connected with the connector57that is mounted on the front side of the back panel26. Thus, the first printed circuit board51of the control board unit21and the second printed circuit board52of the control board unit21are coupled with the HDD22through the back panel26.

The guide pins42of the first support body41and the guide pin48of the second support body44are arranged in a pair of guide rails58that are fixed to the inner surface of each side wall16a. The guide rails58include a pair of first guide rails59which linearly extend in parallel with the virtual plane43from rear ends of the first guide rails59located at the insertion port19toward the back side of the housing16. The front ends of the first guide rails59are arranged nearer the insertion port19than the front end of the first support body41. In addition, the front ends of the first guide rails59are arranged between the front panel24and the back panel26. When the control board units21are disposed in the accommodated position, the guide pins42are arranged in the first guide rails59. The guide pins42on the side plate41bof the first support body41are away from each other at a prescribed interval.

The guide rails58include a pair of second guide rails61. The first ends of the second guide rails61are coupled with the front ends of the first guide rails59. The second ends of the second guide rails61extend away from the virtual plane43toward the back side of the housing16from insertion port19.

Here, the second guide rails61are arranged along circular arc about central axis perpendicular to the side wall16a. The central axis is located in parallel with the rotation axis47. Here, the central angle of the circular arc is set to 90 degrees.

The distance from the insertion port19to the first end of one of the second guide rails61is set to be equal to the distance from the insertion port19to the first end of the other second guide rail61. The size of one of the second guide rails61is set to be equal to the size of the other second guide rail61. As a result, the distance from the insertion port19to the second end of one of the second guide rails61is set to be equal to the distance from the insertion port19to the second end of the other second guide rail61.

The guide rails58include a pair of third guide rails62. First ends of the third guide rails62are coupled with the second ends of the second guide rails61located at upper side of the housing16and second ends of the third guide rails62are coupled with the second ends of the second guide rails61located at lower side of the housing16. That is, the third guide rails62couple the upper second guide rails61with the lower second guide rails61each other. The third guide rails62extend in a vertical direction perpendicular to the virtual plane43. When the control board unit21is disposed in the accommodated space, the guide pin48is arranged in the third guide rails62. The guide rails58are formed from round bars or from square bars that are made of metal or the resin. The guide pins42,48and the guide rails58are corresponding to a drive mechanism in the claims.

FIG. 7illustrates a first partially enlarged sectional view of the electronic device13that schematically illustrates a structure of a storage device unit18. As illustrated inFIG. 7, the ejector unit23includes a case63that encloses the back side and the both sides of the HDD22. The case63is opened in front of the HDD22. The handle part65is coupled with the case63, which is arranged along the back side of the HDD22, so that the handle part65is rotatably about a rotation shaft64perpendicular to the virtual plane43. The handle part65extends along the front side of the case63. The rotation shaft64is arranged, for instance, next to the side of the case63. When the handle part65is arranged at the coupled position that keeps coupling between the case63and the handle part65, the handle part65extends along the front side of the case63. A pair of knobs66aand66bthat are separated each other at a prescribed reference interval on the handle part65are mounted. The knobs66aand66bproject forward from the front side of the handle part65. The knobs66aand66bmove toward and away from each other in parallel with the front side of the handle part65that are located in parallel with the horizontal plane.

FIG. 8illustrates a second partially enlarged sectional view of the electronic device13that schematically illustrates a structure of a storage device unit18.FIG. 8is also referred, and the knobs66aand66bengage with a projecting member67that projects forward from the front end of the case63at the coupled position. The rotation of the handle part65is restricted. When the knobs66aand66bmove toward one another from the position separated by prescribed reference interval, the engagement between the knobs66a,66band the projecting member67is released. The rotation of handle part65is allowed. The handle part65is arranged at the released position. The elastic member such as a plate spring68is fixed to the back side of the handle part65. The plate spring68projects from the back side of the handle part65on the basis of the bend of the plate spring68. The plate spring68is pressed on the front side of the case63at the coupled position. The plate spring68is charged with elastic energy. When the engagement between the knobs66a,66band the projecting member67is released, a drive force is given to the handle part65about the rotation shaft64on the basis of the elastic energy of the plate spring68.

The handle part65has a first side face69and a second side face71that are located on a plane parallel to the rotation shaft64. The first side face69and the second side face71intersect at a prescribed angle. On the other hand, the housing16includes a square pillar72that extends upward from the horizontal plane. As illustrated inFIG. 8, when the handle part65rotates about the rotation shaft64, the first side face69is pressed against the corner of the square pillar72. As a result, the drive force is given to the storage device unit18in forward direction from the insertion port19along a horizontal plane according to the rotation of the handle part65. The storage device unit18is slightly moved forward from the insertion port19.FIG. 9illustrates a third partially enlarged sectional view of the electronic device13that schematically illustrates a structure of the storage device unit18. As illustrated inFIG. 9, when the handle part65further rotates about the rotation shaft64, the second side face71is pressed against the front side of the square pillar72. Thus, the connection between the connector of the HDD22and the connector25is released. Subsequently, for instance, a manager may extract the storage device unit18in forward direction with gripping the handle part65.

On the other hand, when the storage device unit18is mounted, the front end of the storage device unit18is inserted from the insertion port19. At this time, the handle part65is arranged at the released position. The manager inserts the storage device unit18with gripping the handle part65. The handle part65rotates from the released position toward the coupled position when a large part of the HDD22is inserted in the housing16. As a result, the connector of HDD22is concurrently connected to the connector25of the front panel24when the knobs66aand66bengage with the projecting member67. Thus, the storage device unit18is accommodated in the accommodation space of the housing16. With regard to the ejector unit23of the control board unit21, the case63may be integrated at the rear end of the first support body41.

And now, assume that the lower control board unit21is removed from the electronic device13. When the first side face69of the handle part65of the ejector unit23is pressed against the corner of the square pillar72, the lower control board unit21is slightly removed forward.FIG. 10schematically illustrates a first transparent side view of the lower control board unit21that is removed from the housing16of the electronic device13. As a result, as illustrated inFIG. 10, the connection between the connector56of the lower control board unit21and the connector57of the back panel26is released. At this time, the guide pin42is guided to the first guide rails59. The first support body41moves slidably along the virtual plane43. The rotation axis47moves toward the insertion port19on the virtual plane43. The guide pin48of the second support body44moves upward along the third guide rails62according to the movement of the rotation axis47. The second support body44rotates about the rotation axis47while the guide pin48moves upward. The intersection angle alpha is increasing.

When the first support body41is further removed forward from the insertion port19along the virtual plane43, the second support body44further rotates about the rotation axis47.FIG. 11schematically illustrates a second transparent side view of the lower control board unit21that is removed from the housing16of the electronic device13. As a result, as illustrated inFIG. 11, the second support body44keeps a vertical attitude perpendicular to the virtual plane43. The guide pin48rises at the maximum height in the third guide rails62. The intersection angle alpha is kept at 90 degrees.FIG. 12schematically illustrates a transparent perspective side view of the lower control board unit21that is removed from the housing16of the electronic device13. At this time, the slit54of the second support body44and the slit55of the second printed circuit board52receive the interconnecting board29as illustrated inFIG. 12. The interconnecting board29doesn't interfere with the rotation of the second support body44. Afterward, the guide pin48descends in the third guide rails62on the basis of the sliding movement of the first support body41. The intersection angle alpha increases from 90 degrees.FIG. 13schematically illustrates a third transparent side view of the lower control board unit21that is removed from the housing16of the electronic device13. As illustrated inFIG. 13, the guide pin48is guided from the third guide rails62to the second guide rails61and the first guide rails59.

FIG. 14schematically illustrates a fourth transparent side view of the lower control board unit21that is removed from the housing16of the electronic device13. When the guide pin48moves in the first guide rails59as illustrated inFIG. 14, the second support body44is received by the bottom plate16c. The second support body44keeps the horizontal attitude along the horizontal plane. The first support body41and the second support body44extend in parallel with the virtual plane43. The intersection angle alpha is kept at 180 degrees. Thus, the second support body44is received between the lowermost HDD22and the bottom plate16c. The second support body44is concurrently removed from the insertion port19forward when the first support body41is further removed forward. As a result, the lower control board unit21is removed from the electronic device13. And the hot-swapping and the repair of the lower control board unit21are performed. At this time, the upper control board unit21controls the electronic device13to execute. Thus, the electronic device13can be continuously operated. Therefore it is avoided to be removed the electronic device13from the rack12. The upper control board unit21may be removed as well as the lower control board unit21.

Next, assume that the lower control board unit21is mounted on the electronic device13.FIG. 15schematically illustrates a transparent perspective side view of the lower control board unit21that is mounted on the housing16of the electronic device13. First of all, the first support body41and the second support body44are kept at the intersection angle alpha of 180 degrees. The first support body41and the second support body44keep the horizontal attitude. As illustrated inFIG. 15, the front end of the second support body44is inserted into the housing16through the insertion port19. The guide pin48is received by the first guide rails59. The second support body44is inserted into the housing16on the basis of the guide of the first guide rails59. The guide pin42of the first support body41is received by the first guide rails59.FIG. 16schematically illustrates a first transparent side view of the lower control board unit21that is mounted on the housing16of the electronic device13. When the guide pin48moves in the second guide rails61, the front end of the second support body44is lifted on the basis of the guide of the second guide rails61as illustrated inFIG. 16. The first support body41is kept in parallel with the bottom plate16c. The intersection angle alpha is decreasing from 180 degrees.

The second support body44is upstanding toward a vertical attitude while the first support body41is inserted into the housing16. The guide pin48moves from the second guide rails61into the third guide rails62. When the rotation axis47is positioned right under the third guide rails62, the second support body44keeps the vertical attitude. The intersection angle alpha is kept at 90 degrees. The slit54of the second support body44receives the interconnecting board29.FIG. 17schematically illustrates a second transparent side view of the lower control board unit21that is mounted on the housing16of the electronic device13. As illustrated inFIG. 17, the guide pin48descends in the third guide rails62in the direction opposite to the above-mentioned direction where the guide pin48moves when the lower control board unit21is removed. The intersection angle alpha is decreasing from 90 degrees. The connector56of the front end of the first support body41is connected to the connector57at the same time as the handle part65of the ejector unit23is coupled with the case63. Thus, the lower control board unit21is mounted in the electronic device13. The lower control board unit21operates the electronic device13. The upper control board unit21may be mounted as well as the lower control board unit21.

In the above-mentioned server computer apparatus11, the depth from the front side of the rack12to the main back panel17is similarly set to the server blade or the storage blade. As a result, the depth of the server blade and the depth of the storage blade are similarly set. On the other hand, the depth of the control board unit21is greatly different with respect to the depth of HDD22on the basis of the difference in the circuit scale. The depth of the control board unit21almost agrees with the depth of the rack12, as it is desirable for the control board unit21to mount as many electronic components as possible. As a result, the depth of the control board unit21increases more remarkably than the depth of HDD22. The dead space is formed between the front panel24and the back panel26. In the present embodiment, the second support body44, that is, the second printed circuit board52is accommodated in the accommodation space between the front panel24and the back panel26. The mounting area of the electronic components is secured for the second printed circuit board52in addition to the first printed circuit board51on the first support body41. The dead space is effectively used.

Moreover, a slit54on the bottom plate44aof the second support body44and a slit55on the second printed circuit board52are formed, respectively. When the second support body44is accommodated in the accommodation space, the slit54and the slit55receive the interconnecting board29. As a result, a relative rotation of the second support body44to the first support body41is allowed. Therefore, a largest possible area as a mounting area is secured for the second printed circuit board52. Additionally, the second support body44can easily change the attitude from the reference attitude to the inclined attitude using the guide rails58, when the control board unit21is inserted. As a result, the manager only needs to insert the control board unit21from the insertion port19into the accommodation space of the housing16. The manager may easily perform to mount the control board unit21on the electronic device13or remove the control board unit21from the electronic device13at the front side of the electronic device13. The mounting operation and the removing operation are simplified. For instance, the hot-swapping or the repair of the control board unit21are easily performed.