Motorized video projection screen control with digital interface
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-001/22
H02J-001/00
출원번호
US-0305100
(1989-02-02)
발명자
/ 주소
Walter Arthur P. (216 Tremont Ave. S. Plainfield NJ 07080)
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A device for controlling a motorized video projection screen, which allows for remote to the screen adjustability for repeatable positioning of the viewing surface, with the ability to interface, via digital logic, with any device capable of sinking enough current at 5 volts to hold the logic lines
A device for controlling a motorized video projection screen, which allows for remote to the screen adjustability for repeatable positioning of the viewing surface, with the ability to interface, via digital logic, with any device capable of sinking enough current at 5 volts to hold the logic lines in the low state; most notably by computer interface cards.
대표청구항▼
A device for controlling the electric motor in a video projection screen to drive the screen both up and down to its full mechanical limits, which comprises an electronic circuit with: first up/down drive initiation means including: first switch means comprising a first pair of switches, one for up
A device for controlling the electric motor in a video projection screen to drive the screen both up and down to its full mechanical limits, which comprises an electronic circuit with: first up/down drive initiation means including: first switch means comprising a first pair of switches, one for up initiation kand one for down initiation, to provide a manual pulse when momentarily actuated; first gate means comprising a first pair of gates, one for up control and one for down control, each gate having a first input and a second input and an output, said first input of said first up gate, being connected to said first up switch, said first input of said first down gate, being connected to said first down switch; second gate means comprising a second pair of gates, one for up control and one for down control, each gate having a first input and a second input and an output, said first input of said second up gate, being connected to said output of said first up gate, said first input of said second down gate, being connected to said output of said first down gate, functioning along with first gate means to lock out initiation from first up switch means during down initiation and to lock out initiation from first down switch means during up initiation; timer means comprising a pair of adjustable timers, one for up control and one for down control, each timer having an input and an output, said input of said up timer being connected to said output of said second up gate, said input of said down timer being connected to said output of said second down gate, functioning to provide an adjustable length pulse on its output when a pulse appears on its input; third gate means comprising a third pair of gates, one for up control and one for down control, each gate having a first input and a second input and a third input and an output, said first input of said third up gate being connected to said up timer output, said first input of said third down gate being connected to said down timer output, functioning to allow drive initiation and input from several sources, also along with first and second gate means to lock out first up/down drive initiation means during all other drive initiation means; second up/down drive initiation means including: switch means comprising a switch, having a first pole and a second pole, one pole for up initiation and one pole for down initiation, each of said poles having a first throw and a second throw, said first pole being connected to said second input of said third up gate, said first throw of said first pole being connected to circuit common, said second pole being connected to said second input of said third down gate, said first throw of said second pole being connected to circuit common, functioning to provide a mutually exclusive manual signal to either the up or the down circuit for the duration of actuation; digital interface for up/down drive initiation including: first inverter means comprising a first pair of inverters, one for up control and one for down control, each inverter having an input and an output, said input of said first up inverter being connectable to an external signal capable of sinking the required current to change said first up inverter input to the low state, said output of said first up inverter being connected to said third input of said third up gate, said input of said first down inverter being connectable to an external signal capable of sinking the required current to change said first down inverter input to the low state, said output of said first down inverter being connected to said third input of said third down gate; alternating current motor control means including: alternating current trigger means comprising a pair of current triggers, one for up triggering and one for down triggering, having an input and an output, said input of said up alternating current trigger being connected to said output of said third up gate and said second input of said first up gate and said second input of said second down gate, said input of said down alternating current trigger being connected to said output of said third down gate and said second input of said first down gate and said second input of said second up gate; alternating current switch means comprising a pair of current switches, one for up switching and one for down switching, having a gate input and an alternating current input and an alternating current output, said gate input of said up alternating current switch being connected to said up alternating current trigger output, said up alternating current switch input being connectable to an alternating current power line, said up alternating current output being connectable to an up winding on the motor of a video projection screen, said gate input of said down alternating current switch being connected to said down alternating current trigger output, said down alternating current switch input being connectable to an alternating current power line, said down alternating current switch output being connectable to a down winding on the motor of a video projection screen, functioning to apply an alternating current to either of the motor windings during the period that its associated gate input is triggered.
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이 특허에 인용된 특허 (4)
Hansen ; Donald H. ; Waltuck ; Morey H., Automatic remote controlled opthalmic refracting chart projector.
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