Device for generating plane beam/conical shape beam and security device using generated plane beam/cone beam
View Patent ↗Disclosed are an apparatus of converting a laser beam traveling straight to a beam propagated in all directions and a security system using the laser beam propagated in all directions. The laser beam traveling straight is incident on a cylindrical prism and repeatedly reflected and transmitted to be converted to the laser beam propagated in all directions. The laser beam is converted to a plane beam or a conical beam by controlling an incident angle of the laser beam incident on the cylindrical prism. The security system is constructed using the apparatus of generating the plane, beam or conical beam.
1. A security system using a cylindrical prism, comprising:
a plane beam generator using a hollow cylindrical prism with a predetermined diameter;
a signal detector ( 1240 ) located a predetermined distance from the plane beam generator and detects a plane beam generated by the plane beam generator;
a central processing unit ( 1260 ) for judging whether there is an intrusion from a signal detected by the signal detector; and
an output unit ( 1270 ) for outputting the judgment result of the central processing unit.
2. A security system using a cylindrical prism, comprising:
a plane beam generator using a hollow cylindrical prism with a predetermined diameter;
a reflector ( 1230 ) for reflecting a plane beam generated by the plane beam generator;
a signal detector ( 1240 ) for detecting a beam reflected from the reflector;
a central processing unit ( 1260 ) for judging whether there is an intrusion from a signal detected by the signal detector; and
an output unit ( 1270 ) for outputting the judgment result of the central processing unit.
3. A security system in which a plurality of security systems are respectively arranged on a plurality of planes to detect intrusions for the plurality of planes, wherein each of the plurality of security systems comprises:
a plane beam generator using a hollow cylindrical prism with a predetermined diameter;
a reflector ( 1230 ) for reflecting a plane beam generated by the plane beam generator;
a signal detector ( 1240 ) for detecting a beam reflected from the reflector;
a central processing unit ( 1260 ) for judging whether there is an intrusion from a signal detected by the signal detector; and
an output unit ( 1270 ) for outputting the judgment result of the central processing unit.
4. The security system as claimed in claim 2 or 3 , wherein the reflector includes a corner cube to generate a reflective beam that is propagated in parallel with an incident beam incident on the corner cube.
5. A security system using a cylindrical prism, comprising:
a plane beam generating apparatus using a hollow cylindrical prism having a predetermined diameter; and
light-receiving elements for receiving a plane beam generated by the plane beam generating apparatus, the light-receiving elements are arranged in a row at one side such that they can receive the plane beam,
wherein intersecting points of the light-receiving elements and boundary lines ( 1301 , 1302 , 1303 and 1304 ) generated when an intruder ( 1300 ) blocks the plane beam are obtained, equations of the boundary lines are obtained from the position of the plane beam generating apparatus and the intersecting points, and positions (P 1 , P 2 , P 3 and P 4 ) at which the intruder meets the boundary lines are determined to obtain information about the intruder.
6. The security system as claimed in claim 5 , wherein the security system employs two plane beam generating apparatuses, the equations of the four boundary lines are as follows
[
〈
PSTYLELSPACE
=
130
〉
]
y
-
d
=
d
c
-
L
1
(
x
-
c
)
(
a
)
[
〈
PSTYLELSPACE
=
130
〉
]
y
-
d
=
d
c
-
L
2
(
x
-
c
)
(
b
)
[
〈
PSTYLELSPACE
=
130
〉
]
y
-
b
=
b
a
-
M
1
(
x
-
a
)
(
c
)
[
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PSTYLELSPACE
=
130
〉
]
y
-
b
=
b
a
-
M
2
(
x
-
a
)
(
d
)
(here, x is a definite straight line on which the light-receiving elements are arranged, y is an imaginary straight line perpendicular to the line x, (a, b) means x and y coordinates of one of the plane beam generating apparatuses, (c, d) means x and y coordinates of the other plane beam generating apparatus, L 1 and L 2 are intersecting points of boundary lines generated from one of the plane beam generating apparatuses and the line x, and M 1 and M 2 are intersecting points of boundary lines generated from one of the plane beam generating apparatuses and the line x), and the positions at which the intruder meets the boundary lines are determined from the equations (a), (b), (c) and (d) to obtain the information about the intruder.
7. The security system as claimed in claim 5 or 6 , wherein the information about the intruder includes the size, moving speed and moving direction of the intruder.