The above and other exemplary objects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
Throughout the drawings, the same drawing reference numerals will be understood to refer to the same elements, features and structures.
The matters defined in the description such as a detailed construction and elements are provided to assist in a comprehensive understanding of the embodiments of the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The first receive light sensor 100 receives light which is scanned by the resonant mirror controller 110. According to the received light, the first receive light sensor 100 outputs a first horizontal synchronization signal by which a start position of optical scanning can be determined, to the resonant mirror controller 110 and the video signal controller 120. The first receive light sensor 100 includes a photo diode.
The resonant mirror controller 110 scans light emitted from a laser diode (not shown) on a photoconductive drum (not shown). The resonant mirror controller 110, responding to the first horizontal synchronization signal provided by the first receive light sensor 100, resonates a resonant mirror (not shown) so that the light emitted from the laser diode is scanned on the photoconductive drum. The resonant mirror is resonated. The light corresponding to a video signal is scanned on the photoconductive drum.
The video signal controller 120, responding to the first horizontal synchronization signal received from the first receive light sensor 100, controls the laser diode so that light corresponding to the video signal is emitted. According to an exemplary implementation, the video signal controller 120 receives the first horizontal synchronization signal output from the first receive light sensor 100 through one input port.
When light is scanned in two directions, the video signal controller 120 may control the laser diode so that light is scanned in a first direction, and light is scanned in a second direction, which is opposite to the first direction after a predetermined time interval is passed. According to an exemplary implementation, the predetermined time interval is a sum of a time corresponding to a margin of a printing paper after completing the optical scanning in the first direction and a time corresponding to a margin of a printing paper before starting the optical scanning in the second direction.
The first receive light sensor 200 receives light which is scanned by the resonant mirror controller 220. According to the received light, the first receive light sensor 200 outputs a first horizontal synchronization signal, from which a start position of optical scanning can be determined, to the resonant mirror controller 220 and the signal composer 230. The first receive light sensor 200 includes a photo diode.
The second receive light sensor 210 receives light which is scanned by the resonant mirror controller 220. According to the received light, the second receive light sensor 210 outputs a second horizontal synchronization signal, from which a start position of optical scanning can be determined, to the resonant mirror controller 220 and the signal composer 230. The second receive light sensor 210 includes a photo diode.
The resonant mirror controller 220 scans light emitted from a laser diode on a photoconductive drum (not shown). The resonant mirror controller 220, responding to the first horizontal synchronization signal provided by the first receive light sensor 200, resonates a resonant mirror (not shown) so that light emitted from the laser diode may be scanned on the photoconductive drum. The resonant mirror is resonated. The light scanned on the photoconductive drum corresponds to a video signal.
The signal composer 230 mixes the first horizontal synchronization signal output from the first receive light sensor 200 and the second horizontal synchronization signal output from the second receive light sensor 210, and outputs the composed horizontal synchronization signal obtained by the signal composer 230 to the video signal controller 240.
The signal composer 230 receives the first horizontal synchronization signal and the second horizontal synchronization signal through the base terminals of two transistors, respectively. The signal composer 230 then mixes the first horizontal synchronization signal and the second horizontal synchronization signal. The signal composer 230 also receives the first horizontal synchronization signal and the second horizontal synchronization signal through an OR logic gate, and mixes the first horizontal synchronization signal and the second horizontal synchronization signal.
Meanwhile, the resonant mirror controller 220 generates identifying signals which are used to identify whether a horizontal synchronization signal composed by the signal composer 230 is the first horizontal synchronization signal or the second horizontal synchronization signal, and outputs the generated identifying signals to the video signal controller 240. The resonant mirror controller 220 generates the identifying signals using one of a SR Flip-Flop or a JK Flip-Flop. The resonant mirror controller 220 generates the identifying signals using an OR logic gate and a T Flip-Flop.
The video signal controller 240, responding to a composed horizontal synchronization signal obtained by mixing, which is output from the signal composer 230, controls the laser diode (not shown) so that light corresponding to the video signal may be emitted. According to an exemplary implementation, the video signal controller 240 receives the composed horizontal synchronization signal output from the signal composer 230 through one input port. Meanwhile, the video signal controller 240 receives an identifying signal from the resonant mirror controller 220. The identifying signal is used for identifying whether the composed horizontal synchronization signal obtained by mixing is the first horizontal synchronization signal or the second horizontal synchronization signal.
The video signal controller 240 receives the composed horizontal synchronization signal obtained by mixing through one input terminal, and simultaneously receives an identifying signal for identifying the composed horizontal synchronization signal. Accordingly, the light can be scanned in two directions based on the identification of whether the composed horizontal synchronization signal obtained by mixing is the first horizontal synchronization signal or the second horizontal synchronization signal.
The video signal controller 240 identifies the composed horizontal synchronization signal output from the signal composer 230 based on the identifying signal. When the identified signal is the first horizontal synchronization signal (SOS1), the video signal controller 240 controls the laser diode so that light of a video signal (VDO) corresponding to a first direction (forward) may be emitted. The video signal controller 240 identifies the mixed horizontal synchronization signal output from the signal composer 230 based on the identifying signal. When the identified signal is the second horizontal synchronization signal (SOS 2), the video signal controller 240 controls the laser diode so that light of a video signal (VDO) corresponding to a second direction (reverse) may be emitted.
The first receive light sensor 300 receives light which is scanned by the resonant mirror controller 320, and according to the received light, outputs a first horizontal synchronization signal, from which a start position of optical scanning can be determined, to the resonant mirror controller 320. The first receive light sensor 300 includes a photo diode.
The second receive light sensor 310 receives light which is scanned by the resonant mirror controller 320, and according to the received light, outputs a second horizontal synchronization signal, from which a start position of optical scanning can be determined, to the resonant mirror controller 320. The second receive light sensor 310 includes a photo diode.
The resonant mirror controller 320 scans light emitted from a laser diode (not shown) on a photoconductive drum (not shown). The resonant mirror controller 320, responding to the first horizontal synchronization signal provided by the first receive light sensor 300, resonates a resonant mirror (not shown) so that the light emitted from the laser diode may be scanned on the photoconductive drum. The resonant mirror is resonated. The light scanned on the photoconductive drum corresponds to the light emitted from the laser diode.
Meanwhile, the resonant mirror controller 320 mixes the first horizontal synchronization signal output from the first receive light sensor 300 and the second horizontal synchronization signal output from the second receive light sensor 310. The resonant mirror controller 320 then outputs a composed horizontal synchronization signal obtained by the mixing to the video signal controller 330.
The resonant mirror controller 320 receives the first horizontal synchronization signal and the second horizontal synchronization signal through base terminals of two transistors respectively. The resonant mirror-controller 320 then mixes the first horizontal synchronization signal and the second horizontal synchronization signal. The resonant mirror controller 320 receives the first horizontal synchronization signal and the second horizontal synchronization signal through an OR logic gate, and mixes the first horizontal synchronization signal and the second horizontal synchronization signal.
Meanwhile, the resonant mirror controller 320 generates an identifying signal for identifying the composed horizontal synchronization signal obtained by the mixing, and outputs the identifying signals to the video signal controller 330. The resonant mirror controller 320 generates the identifying signals using a SR Flip-Flop or a JK Flip-Flop. The resonant mirror controller 320 generates the identifying signals using the OR logic gate and a T Flip-Flop.
The video signal controller 330 controls the laser diode so that light corresponding to the video signal may be emitted. The laser diode is controlled in response to the composed horizontal synchronization signal and the identifying signal provided from the resonant mirror controller 320.
The video signal controller 330 receives the composed horizontal synchronization signal through one input terminal, and simultaneously receives the identifying signals for identifying the composed horizontal synchronization signal. Accordingly, the light can be scanned in two directions based on identifying whether the composed horizontal synchronization signal is the first horizontal synchronization signal or the second horizontal synchronization signal.
The optical scanning unit may be used in an image forming device such as a printer and a multifunctional embedded application platform, among others.
In the optical scanning unit, according to an exemplary embodiment of the present invention, a video signal controller can receive a plurality of horizontal synchronization signals (SOS; Start of Scan) by only one input pin irrespective of the number of received light sensors which generate horizontal synchronization signals (SOS; Start Of Scan) corresponding to a start position of optical scanning when light is scanned using a micro resonant scanning mirror (SOS; Start Of Scan). Accordingly, the video signal controller does not need to have a plurality pins, and thus manufacturing costs decrease.
While the present invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.
Number | Date | Country | Kind |
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2006-58885 | Jun 2006 | KR | national |