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An image forming apparatus, having a plurality of image forming cartridges arranged one above another and configured to form an image on a medium; a plurality of optical writing devices arranged one above another respectively corresponding to the plurality of image forming cartridges and configured

An image forming apparatus, having a plurality of image forming cartridges arranged one above another and configured to form an image on a medium; a plurality of optical writing devices arranged one above another respectively corresponding to the plurality of image forming cartridges and configured to emit light beams to the plurality of image forming cartridges so as to form the image on the medium; and a vertical stay disposed between the plurality of image forming cartridges and optical writing devices and including slots configured to allow the light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges.

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1. An image forming apparatus, comprising:a plurality of optical writing devices arranged one above another respectively corresponding to a plurality of image forming cartridges; anda vertical stay including slots and being disposed between the plurality of image forming cartridges and optical writi

1. An image forming apparatus, comprising:a plurality of optical writing devices arranged one above another respectively corresponding to a plurality of image forming cartridges; anda vertical stay including slots and being disposed between the plurality of image forming cartridges and optical writing devices. 2. The image forming apparatus according to claim 1, wherein the slots are arranged to allow light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges. 3. The image forming apparatus according to claim 1, further comprising:a housing configured to house the plurality of image forming cartridges and optical writing devices. 4. The image forming apparatus according to claim 3, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of optical writing devices. 5. The image forming apparatus according to claim 3, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 6. The image forming apparatus according to claim 3, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 7. The image forming apparatus according to claim 1, wherein each of the slots of the vertical stay substantially match in size with a diameter and a scanning width of a respective light beam emitted by the plurality of optical writing devices. 8. The image forming apparatus according to claim 1, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices. 9. The image forming apparatus according to claim 1, further comprising:a vertically arranged belt disposed adjacent to the plurality of image forming cartridges. 10. The image forming apparatus according to claim 9, wherein:the vertically arranged belt is configured to convey a medium to each of the plurality of image forming cartridges in order to form an image on the medium. 11. An image forming apparatus, comprising:a plurality of image forming cartridges arranged one above another and configured to form an image on a medium;a plurality of optical writing devices arranged one above another respectively corresponding to the plurality of image forming cartridges and configured to emit light beams to the plurality of image forming cartridges so as to form the image on the medium; anda vertical stay disposed between the plurality of image forming cartridges and optical writing devices and including slots configured to allow the light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges. 12. The image forming apparatus according to claim 11, further comprising:a housing configured to house the plurality of image forming cartridges and optical writing devices. 13. The image forming apparatus according to claim 12, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of optical writing devices. 14. The image forming apparatus according to claim 12, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 15. The image forming apparatus according to claim 12, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 16. The image forming apparatus according to claim 11, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plur ality of optical writing devices. 17. The image forming apparatus according to claim 11, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices to support the respective optical writing devices. 18. The image forming apparatus according to claim 11, further comprising:a vertically arranged belt disposed adjacent to the plurality of image forming cartridges. 19. The image forming apparatus according to claim 18, wherein:the vertically arranged belt is configured to convey the medium to each of the plurality of image forming cartridges in order to form the image on a transfer medium. 20. An image forming apparatus, comprising:a plurality of image forming cartridges arranged one above another, each containing a different color toner and a photoconductive drum;a plurality of optical writing devices arranged one above another respectively corresponding to the plurality of image forming cartridges, each including at least one mirror and a light source; anda vertical stay disposed between the plurality of image forming cartridges and optical writing devices and including slots arranged to allow light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges. 21. The image forming apparatus according to claim 20, further comprising:a housing configured to house the plurality of image forming cartridges and optical writing devices. 22. The image forming apparatus according to claim 21, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of optical writing devices. 23. The image forming apparatus according to claim 21, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 24. The image forming apparatus according to claim 21, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 25. The image forming apparatus according to claim 20, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plurality of optical writing devices. 26. The image forming apparatus according to claim 20, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices. 27. The image forming apparatus according to claim 20, further comprising:a vertically arranged belt disposed adjacent to the plurality of image forming cartridges. 28. The image forming apparatus according to claim 27, wherein:the vertically arranged belt is configured to convey a medium to each of the plurality of image forming cartridges in order to form the image on the medium. 29. An image forming apparatus, comprising:a plurality of image forming cartridges arranged one above another;a plurality of optical writing devices arranged one above another respectively corresponding to the plurality of image forming cartridges; anda vertical stay including slots and being disposed between the plurality of image forming cartridges and optical writing devices. 30. The image forming apparatus according to claim 29, wherein the slots are arranged to allow light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges. 31. The image forming apparatus according to claim 29, further comprising:a housing configured to house the plurality of image forming cartridges and optical writing devices. 32. The image forming apparatus according to claim 31, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area includin g the plurality of image forming cartridges from an optical writing area including the plurality of optical writing devices. 33. The image forming apparatus according to claim 31, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 34. The image forming apparatus according to claim 31, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 35. The image forming apparatus according to claim 29, wherein each of the slots of the vertical stay substantially match in size with a diameter and a scanning width of a respective light beam emitted by the plurality of optical writing devices. 36. The image forming apparatus according to claim 29, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices. 37. The image forming apparatus according to claim 29, further comprising:a vertically arranged belt disposed adjacent to the plurality of image forming cartridges. 38. The image forming apparatus according to claim 37, wherein:the vertically arranged belt is configured to convey a medium to each of the plurality of image forming cartridges in order to form an image on the medium. 39. An image forming system, comprising:a plurality of image forming means arranged one above another for forming an image on a transfer medium;a plurality of optical writing means arranged one above another respectively corresponding to the plurality of image forming means and for emitting light beams to the plurality of image forming means so as to form the image on the transfer medium; anda vertical stay means for supporting and disposed between the plurality of image forming means and optical writing means for allowing the light beams emitted from the plurality of optical writing means to pass therethrough to the plurality of image forming means. 40. The image forming system according to claim 39, wherein the vertical stay means includes slot means for allowing the light beams emitted from the plurality of optical writing means to pass therethrough to the plurality of image forming means. 41. The image forming system according to claim 39, further comprising:housing means for housing the plurality of image forming means and optical writing means. 42. The image forming system according to claim 41, wherein the vertical stay means is disposed substantially at a center position of the housing means and separates an image forming area including the plurality of image forming means from an optical writing area including the optical writing means. 43. The image forming system according to claim 41, wherein the vertical stay means has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming means and optical writing means. 44. The image forming system according to claim 41, wherein the vertical stay means extends from a top portion of the housing means to a bottom portion of the housing means. 45. The image forming system according to claim 39, wherein the vertical stay means includes slot means substantially matching in size with a scanning width of a respective light beam emitted by the plurality of optical writing means. 46. The image forming system according to claim 39, further comprising:a plurality of horizontal bottom plate means connected to the vertical stay means and disposed underneath respective optical writing means and for supporting the respective optical writing means. 47. The image forming system according to claim 46, further comprising:a vertically arranged image transfer means disposed adjacent to the plurality of image forming means. 48. The image forming system according to claim 47, wherein:the vertically arranged image transfer means is for conveying a transfer medium to each of the plurality of image forming means so as to form the image on the transfer medium. 49. A method of forming an image, comprising:emitting a plurality of light beams from a plurality of vertically arranged light emitting devices;passing the plurality of light beams through corresponding slots of a vertical stay;receiving the plurality of light beams which have passed through the corresponding slots of the vertical stay;forming a toner image using the plurality of light beams which have been received. 50. The image forming method according to claim 49, further comprising the step of:transferring the toner image from a light sensitive medium to another medium. 51. The image forming method according to claim 49, further comprising the step of:housing the plurality of light emitting devices in a housing. 52. The image forming method according to claim 51, further comprising the step of:housing a plurality of image forming cartridges, used to form the toner image, in the housing. 53. The image forming method according to claim 52, wherein the vertical stay is disposed at an interior position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of light emitting devices. 54. The image forming method according to claim 52, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 55. The image forming method according to claim 49, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of a plurality of image forming cartridges and light emitting devices. 56. The image forming method according to claim 49, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plurality of light emitting devices. 57. The image forming method according to claim 50, further comprising:moving a vertically arranged belt which is adjacent to a plurality of image forming cartridges. 58. The image forming method according to claim 57, wherein said moving step comprises:moving the vertically arranged belt to convey said another medium to each of the plurality of image forming cartridges so as to form the image on said another medium. 59. An image forming apparatus, comprising:a plurality of photosensitive drums arranged one above another and configured to form an image on a medium;a plurality of optical writing devices arranged one above another, said plurality of optical writing devices respectively corresponding to the plurality of photosensitive drums and configured to emit light beams to the plurality of photosensitive drums so as to form the image on the medium; anda vertical stay disposed between the plurality of photosensitive drums and optical writing devices and including slots configured to allow the light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of photosensitive drums. 60. The image forming apparatus according to claim 59, further comprising:a housing configured to house a plurality of image forming cartridges and the plurality of optical writing devices. 61. The image forming apparatus according to claim 60, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area in the housing, the image forming area configured to house the plurality of image forming cartridges, from an optical writing area in the housing, the optical writing area configured to house the plurality of optical writing devices. 62. The image forming apparatus according to claim 60, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 63. The image forming apparatus according to claim 60, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 64. The image forming apparatus accordi ng to claim 59, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plurality of optical writing devices. 65. The image forming apparatus according to claim 59, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices to support the respective optical writing devices. 66. The image forming apparatus according to claim 59, further comprising:a vertically arranged belt. 67. The image forming apparatus according to claim 66, wherein:the vertically arranged belt is configured to convey the medium to each of a plurality of image forming cartridges in order to form the image on a transfer medium. 68. An image forming apparatus, comprising:a plurality of optical writing devices arranged one above another respectively corresponding to a plurality of image forming cartridges, each optical writing device including at least one mirror and a light source; anda vertical stay disposed between the plurality of image forming cartridges and optical writing devices and including slots arranged to allow light beams emitted from the plurality of optical writing devices to pass therethrough to the plurality of image forming cartridges. 69. The image forming apparatus according to claim 68, further comprising:a housing configured to house the plurality of image forming cartridges and optical writing devices. 70. The image forming apparatus according to claim 69, wherein the vertical stay is disposed substantially at a center position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of optical writing devices. 71. The image forming apparatus according to claim 69, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming cartridges and optical writing devices. 72. The image forming apparatus according to 69 , wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 73. The image forming apparatus according to claim 68, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plurality of optical writing devices. 74. The image forming apparatus according to claim 68, further comprising:a plurality of horizontal bottom plates connected to the vertical stay and disposed underneath respective optical writing devices. 75. The image forming apparatus according to claim 68, further comprising:a vertically arranged belt disposed adjacent to the plurality of image forming cartridges. 76. The image forming apparatus according to claim 75, wherein:the vertically arranged belt is configured to convey a medium to each of the plurality of image forming cartridges in order to form the image on the medium. 77. An image forming system, comprising:a plurality of optical writing means arranged one above another respectivelycorresponding to a plurality of image forming means and for emitting light beams to the plurality of image forming means so as to form an image on a transfer medium; anda vertical stay means for supporting and disposed between the plurality of imageforming means and optical writing means for allowing the light beams emitted from the plurality of optical writing means to pass therethrough to the plurality of image forming means. 78. The image forming system according to claim 77, wherein the vertical stay means includes slot means for allowing the light beams emitted from the plurality of optical writing means to pass therethrough to the plurality of image forming means. 79. The image forming system according to claim 78, wherein the slot means are substantially matching in size with a scanning width of a respective light beam emitted by the plurality of optical writing means. 80. The image forming system according to claim 77, further comprising:housing means for housing the plurality of image forming means and optical writing means. 81. The image forming system according to claim 80, wherein the vertical stay means is disposed substantially at a center position of the housing means and separates an image forming area including the plurality of image forming means from an optical writing area including the optical writing means. 82. The image forming system according to claim 80, wherein the vertical stay means has a sufficient rigidity to bear a buckling load ascribable to a weight of the plurality of image forming means and optical writing means. 83. The image forming system according to claim 80, wherein the vertical stay means extends from a top portion of the housing means to a bottom portion of the housing means. 84. The image forming system according to claim 77, further comprising:a plurality of horizontal bottom plate means connected to the vertical stay means and disposed underneath respective optical writing means and for supporting the respective optical writing means. 85. The image forming system according to claim 84, further comprising:a vertically arranged image transfer means disposed adjacent to the plurality of image forming means. 86. The image forming system according to claim 85, wherein:the vertically arranged image transfer means is for conveying a transfer medium to each of the plurality of image forming means so as to form the image on the transfer medium. 87. A method of forming an image, comprising:emitting a plurality of light beams from a plurality of vertically arranged light emitting devices;passing the plurality of light beams emitted from a corresponding plurality of vertically arranged light emitting devices through corresponding slots of a vertical stay; andreceiving the plurality of light beams which have passed through the corresponding slots of the vertical stay. 88. The image forming method according to claim 87, further comprising the step of:forming a toner image using the plurality of light beams which have been received; andtransferring the toner image from a light sensitive medium to another medium. 89. The image forming method according to claim 87, further comprising the step of:housing the plurality of light emitting devices in a housing. 90. The image forming method according to claim 89, further comprising the step of:housing a plurality of image forming cartridges, used to form the toner image, in the housing. 91. The image forming method according to claim 90, wherein the vertical stay is disposed at an interior position of the housing and separates an image forming area including the plurality of image forming cartridges from an optical writing area including the plurality of light emitting devices. 92. The image forming method according to claim 90, wherein the vertical stay extends from a top portion of the housing to a bottom portion of the housing. 93. The image forming method according to claim 87, wherein the vertical stay has a sufficient rigidity to bear a buckling load ascribable to a weight of a plurality of image forming cartridges and light emitting devices. 94. The image forming method according to claim 87, wherein each of the slots of the vertical stay substantially match in size with a scanning width of a respective light beam emitted by the plurality of light emitting devices. 95. The image forming method according to claim 88, further comprising:moving a vertically arranged belt which is adjacent to a plurality of image forming cartridges. 96. The image forming method according to claim 95, wherein said moving step comprises:moving the vertically arranged belt to convey said another medium to each of the plurality of image forming cartridges so as to form the image on said another medium.