| 摘要 |
PURPOSE:To relatively increase the quantity of received light and to increase reading speed even in high resolution, by displacing light receiving elements confronting with each other interposing a light emitting element string within the range of 1/3-1/2 of an arranging pitch. CONSTITUTION:An original 10 being carried with a platen roller 9 is illuminated by a light emitting element 3 in the light emitting element string 4, and reflected light is sent to light receiving element strings 6A and 6B through rod array lenses 7A and 7B. At this time, in an image sensor 16, the arranging pitches P of the light receiving elements 5A and 5B are set at 125mum which generates resolution of 8 dots/mm to obtain the resolution of 16 dots/mm, and sizes in directions of main scan and sub scan W and D are set at 62.5mum. Then, a deviated quantity (d) between the light receiving elements 5A and 5B is displaced within the range of 1/3-1/2 of the arranging pitch P. At this time, it is possible to obtain more exact reading accuracy as the deviated quantity (d) approaches nearer to 1/2.
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