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A wireless user-interface method and arrangement having a light source and a circuit arrangement that detects the presence and position of the light source. A light source emits modulated light having a first modulation frequency that is captured by a camera circuit arrangement. A circuit arrangemen

A wireless user-interface method and arrangement having a light source and a circuit arrangement that detects the presence and position of the light source. A light source emits modulated light having a first modulation frequency that is captured by a camera circuit arrangement. A circuit arrangement uses relative pixel luminances and differences in pixel luminances between frames to detect the presence of modulated light from the light source. The position of the light source is tracked from frame to frame and the position information is output for use by application software or circuitry to direct movement of a pointer in a computer display, for example. Modulated light having a second modulation frequency from the light source is detected by the circuit arrangement and interpreted as selection of a control function, which is provided as output to application software or circuitry. The application uses the position of the light source along with control signals to identify an operation to perform.

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A wireless user-interface method and arrangement having a light source and a circuit arrangement that detects the presence and position of the light source. A light source emits modulated light having a first modulation frequency that is captured by a camera circuit arrangement. A circuit arrangemen

A wireless user-interface method and arrangement having a light source and a circuit arrangement that detects the presence and position of the light source. A light source emits modulated light having a first modulation frequency that is captured by a camera circuit arrangement. A circuit arrangement uses relative pixel luminances and differences in pixel luminances between frames to detect the presence of modulated light from the light source. The position of the light source is tracked from frame to frame and the position information is output for use by application software or circuitry to direct movement of a pointer in a computer display, for example. Modulated light having a second modulation frequency from the light source is detected by the circuit arrangement and interpreted as selection of a control function, which is provided as output to application software or circuitry. The application uses the position of the light source along with control signals to identify an operation to perform. anning direction; and a lens attitude adjusting device including a tilting device to rotate at least one lens of the plurality of lenses around an axis parallel to the length of the one lens to adjust the characteristic of a scan line image, and wherein at least one of the tilting devices rotates the one lens so that the characteristic of the first scan line image and the characteristic of the second scan line image substantially become the same. 2. The apparatus of claim 1, wherein the deflector includes a polygon mirror. 3. The apparatus of claim 1, further comprising: third and fourth image forming devices including respective scanning optical devices and respective developing devices, wherein each of the scanning optical devices comprises the light source, the deflector, the plurality of lenses, and the lens attitude adjusting device. 4. The apparatus of claim 3, further comprising: an adjustment device adjusting at least one of the first, second, third and fourth scanning optical devices so that the scanned images formed by of the first, second, third and fourth scanning optical devices are superposed on a recording sheet. 5. The apparatus of claim 1, wherein one of the plurality of lenses is a fθ lens. 6. The apparatus of claim 1, wherein one lens of the plurality of lenses is a cylindrical lens. 7. The apparatus of claim 1, wherein the plurality of lenses comprise a fθ lens and a cylindrical lens. 8. The apparatus of claim 7, wherein the tilting device rotates the cylindrical lens around an axis parallel to the length of the cylindrical lens so as to scan a straight line on the image forming surface. 9. The apparatus of claim 7, wherein the tilting device of each of the first scanning device and the second scanning device comprises two tilting mechanisms to rotate the fθ lens and the cylindrical lens around an axis parallel to the length of each lens respectively so that the deflected light scans a straight line on the image forming surface. 10. The apparatus of claim 1, wherein the one lens is positioned closest to the image forming surface among the plurality of lenses. 11. The apparatus of claim 1, wherein the lens attitude adjusting device comprises first, second and third supporting members to rotate at least one of the lenses around the axis parallel to the length of the one lens, wherein the first and second supporting members are located at both end portions of the one lens for supporting the one lens respectively, and the third supporting member is located at middle portion of the one lens for supporting the one lens so that the supporting point of the third supporting member is distant with respect to an imaginary line connecting the supporting points of the first and second supporting members. 12. The apparatus of claim 1, wherein the lens attitude adjusting device comprises a screw. 13. The apparatus of claim 1, wherein the characteristic of the image is a straight line. 14. The apparatus of claim 1, wherein each of the first and second images is a line image and the characteristic of the image is the shape of the line image. 15. The apparatus of claim 14, wherein the tilting device of each of the first and second optical devices rotates the respective one lens so as to make the respective line image to become a desired line. 16. The apparatus of claim 15, wherein the tilting device of each of the first and second optical devices rotates the respective one lens so as to make deviations between the respective line image and the desired line smaller than 200 μm. 17. The apparatus of claim 16, wherein the deviations are made smaller than 120 μm. 18. The apparatus of claim 14, wherein the tilting device of at least one of the first and second optical devices rotates the respective one lens so as to make the first and second images to conform to each other. 19. The apparatus of claim 1, further comprising: an adjustment device adjusting at least one of the first and second scanning optical