Abstract: An electronic pen transmits pen information to a controller corresponding to detection of a touch condition, and thereafter turns ON a connecting switch that disconnects electrical connection between the tip portion and the grip portion of the pen that are provided in a state of being electrically disconnected from each other so as to cause a pen input acceptance state. The controller determines that position detection information is from the electronic pen when the position detection information is received from a position detecting device after the pen information is received from the electronic pen, while the controller determines that position detection information is from a finger when the position detection information is received from the position detecting device without receiving the pen information from the electronic pen.

Abstract: An electronic pen transmits pen information to a controller corresponding to detection of a touch condition, and thereafter turns ON a connecting switch that disconnects electrical connection between the tip portion and the grip portion of the pen that are provided in a state of being electrically disconnected from each other so as to cause a pen input acceptance state. The controller determines that position detection information is from the electronic pen when the position detection information is received from a position detecting device after the pen information is received from the electronic pen, while the controller determines that position detection information is from a finger when the position detection information is received from the position detecting device without receiving the pen information from the electronic pen.

Abstract: The optical scanning device includes a deflector 22 for deflecting plural laser beams in batch, first and second f&thgr; lenses 24, 25 for converting the laser beams from the deflector 22 into uniform speed linear motion, reflection mirrors 23a to 23g for reflecting the laser beams from the first and second f&thgr; lenses 24, 25, photoreceptor drums 2a, 2b, 2c, 2d on which latent images are formed by laser beams, and third f&thgr; lenses 26a to 26d for focusing the laser beams reflected by the reflection mirrors 23a to 23g and guiding onto the photoreceptor drums 2a, 2b, 2c, 2d. The laser beam 9a reflected by the reflection mirror 23 remotest from the deflector 23 is the laser beam for forming a yellow image.

Abstract: An optical scanning apparatus is configured to comprise (a) a deflector for deflecting and scanning a plurality of bundled incident laser beams, (b) a conversion optical system for converting the bundle of laser beams moving at a constant angular velocity into a bundle of laser beams moving at a constant linear velocity, (c) reflection mirrors for separating the bundled laser beams into four corresponding to respective colors, (d) photosensitive members for forming respective electrostatic latent images by means of the laser beams corresponding to the respective colors, wherein one of the photosensitive members is disposed on a plane parallel to an area defined by the laser beams traveling between the deflector and the conversion optical system and (e) a correction optical system for correcting curvatures of field with respect to the respective laser beams and leading the laser beams to the photosensitive members.

Abstract: The optical scanning device comprises a deflector 22 for deflecting plural laser beams in batch, first and second f&thgr; lenses 24, 25 for converting the laser beams from the deflector 22 into uniform speed linear motion, reflection mirrors 23a to 23g for reflecting the laser beams from the first and second f&thgr; lenses 24, 25, photoreceptor drums 2a , 2b , 2c , 2d on which latent images are formed by laser beams, and third f&thgr; lenses 26a to 26d for focusing the laser beams reflected by the reflection mirrors 23a to 23g and guiding onto the photoreceptor drums 2a , 2b , 2c , 2d. The laser beam 9a reflected by the reflection mirror 23 remotest from the deflector 23 is the laser beam for forming a yellow image.