Unauthorized use preventing system of projection-type projector
First Claim
1. An unauthorized use preventing system of a projection-type projector, the system comprising:
- an unauthorized use preventing device which is separate and remote from said projection-type projector; and
a security section provided in said projection-type projector,wherein said unauthorized use preventing device includes;
a first GPS receiver that measures a global position thereof and outputs the global position as first position information; and
a first radio transmitter that wirelessly transmits said first position information to an outside,said security section includes;
a second GPS receiver that measures a global position thereof and outputs the global position as second position information;
a first radio receiver that receives said first position information;
a processor configured to perform a process including;
a position comparison operation that receives said first position information and said second position information, determines whether an inter-instrument distance calculated based on both pieces of said information is less than a threshold distance or equal to or more than said threshold distance, and outputs a result of the determination as a position comparison result signal; and
a logical product calculation operation that receives said position comparison result signal and a power supply turning-on signal indicating whether or not a power supply of said projection-type projector is turned on, and calculates and outputs a logical product of both of said signals, andan output signal of said logical product calculation operation is decisive of whether or not to light a light source of said projection-type projector, so that unauthorized use of said projection-type projector is prevented.
1 Assignment
0 Petitions
Accused Products
Abstract
An unauthorized use preventing device includes: a first measuring unit that measures a global position thereof and outputs the global position as first position information; and a first transmission unit that wirelessly transmits the first position information to an outside. The security section includes: a second measuring unit that measures a global position thereof and outputs the global position as second position information; a first receiving unit that receives the first position information; a position comparison unit that determines whether an inter-instrument distance calculated based on the first and second position information is less than a threshold distance or equal to or more than the threshold distance, and outputs a result of the determination as a position comparison result signal; and a logical product calculation unit that calculates and outputs a logical product of the position comparison result signal and a power supply turning-on signal.
7 Citations
11 Claims
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1. An unauthorized use preventing system of a projection-type projector, the system comprising:
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an unauthorized use preventing device which is separate and remote from said projection-type projector; and a security section provided in said projection-type projector, wherein said unauthorized use preventing device includes; a first GPS receiver that measures a global position thereof and outputs the global position as first position information; and a first radio transmitter that wirelessly transmits said first position information to an outside, said security section includes; a second GPS receiver that measures a global position thereof and outputs the global position as second position information; a first radio receiver that receives said first position information; a processor configured to perform a process including; a position comparison operation that receives said first position information and said second position information, determines whether an inter-instrument distance calculated based on both pieces of said information is less than a threshold distance or equal to or more than said threshold distance, and outputs a result of the determination as a position comparison result signal; and a logical product calculation operation that receives said position comparison result signal and a power supply turning-on signal indicating whether or not a power supply of said projection-type projector is turned on, and calculates and outputs a logical product of both of said signals, and an output signal of said logical product calculation operation is decisive of whether or not to light a light source of said projection-type projector, so that unauthorized use of said projection-type projector is prevented. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification