DRIVE APPARATUS FOR OPTICAL ELEMENT ARRAY

• Main Authors: TAKANASHI, ITSUO, TATSUMI, FUJIKO, NAKAGAKI, SHINTARO, NEGISHI, ICHIRO, SUZUKI, TETSUJI, TAKAHASHI, RYUSAKU, MAENO, KEIICHI, YOSHIMURA, TSUYOSHI
• Format: Patent
• Language: English
• Published: 14.07.1993
• Edition: 5
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

A drive apparatus for an optical element array includes a counter counting clock pulses and being periodically reset at a horizontal scanning period. The counter outputs first and second counter signals out of phase with each other. A latch holds a pixel-corresponding segment of an input image signal. One of clock signals out of phase with each other is selected in response to the pixel-corresponding input-signal segment held by the latch. A first comparator compares the first counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a first identity signal when the first counter signal and the pixel-corresponding input-signal segment are equal to each other. A second comparator compares the second counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a second identity signal when the second counter signal and the pixel-corresponding input-signal segment are equal to each other. A drive pulse is generated which starts in synchronism with a start of a horizontal scanning period and which ends in response to the selected clock signal and in response to the first and second identity signals. An optical element in the array is driven in response to the drive pulse.