WO2007081099A1

WO2007081099A1 - Dome type infrared ray sensor

Info

Publication number: WO2007081099A1
Application number: PCT/KR2006/005748
Authority: WO
Inventors: Hwa-Sook Lee
Original assignee: SEMYUNG ELECTRONICS CO Ltd
Current assignee: SEMYUNG ELECTRONICS CO Ltd
Priority date: 2006-01-13
Filing date: 2006-12-27
Publication date: 2007-07-19
Anticipated expiration: 2008-07-13
Also published as: KR20070076404A; KR100749725B1

Abstract

This application relates to a dome type infrared ray sensor, which is not only simple and easy to assemble but is easy to install because a lens assembly having a lens unit whose lens is angle-adjustable in the vertical direction is mounted rotatably 360 ° left or right on the center of a base fixed on the ceiling so the directions can be easily and accurately adjusted with the said sensor assembled on the wall. The said sensor (1000) comprises a through hole (1130) of a predetermined diameter formed in the center of said base (1100); and a rotating plate (1300) mounted in a through hole (1130) of said base (1100) so as to rotate freely together with said lens assembly (1200), and combined with a lens unit holder (1210) of said lens assembly (1200) while inserted into said through hole (1130) on one side of said base (1100).

Description

Description DOME TYPE INFRARED RAY SENSOR

[1] TECHNICAL FIELD

[2] The present invention relates to a dome type infrared ray sensor, and more specifically to a dome type infrared ray sensor, which is not only simple and easy to assemble but also is easy to install because a lens assembly having a lens unit whose lens is angle-adjusted in the vertical direction is mounted rotatably 360 degrees left or right on the center of a base fixed on the ceiling so that the left and right directions of the lens can be easily and accurately adjusted with the dome type infrared ray sensor assembled on the wall.

[3] BACKGROUND ART

[4] In general, an infrared ray sensor is to sense moving bodies that radiate far infrared rays, and it has an optical system of a reflector or lens for determining the field of sensing the moving bodies, a pyroelectric element installed at the location of the focus of the optical system, and a signal processing circuit. The signal processing circuit outputs an alarm signal to indicate that it has sensed a moving body if the output level of the pyroelectric element exceeds the minimum physical quantity that causes reaction.

[5] Such an infrared ray sensor exists in various forms. In particular, the present invention relates to a dome type infrared ray sensor, which minimizes the interference with other things because the protruded height is low even if installed on the ceiling.

[6] The conventional dome type infrared ray sensor is disclosed in Japanese Patent

Laid-Open No. H05-113366. As shown in Figs. 3 to 5 of the H05-113366, the reflector is pivotably installed on the base by a light-receiving axis to make it possible to adjust the angle up or down. That is, when the reflector frame is rotated by the light-receiving axis, the upper lever moves along a long hole of the coordinate board to be guided into the engaging hole of the display board. Therefore, when the display board rotatably installed on the coordinate board by a fulcrum shaft is pivoted, it is possible to confirm whether the sensed field of the reflector is displayed through a window.

[7] However, a lens assembly provided with such a reflector is constructed not rotatably 360 degrees left or right on the base, so it has disadvantages that it is difficult not only to assemble the mounting board and the base during installation but also to match the angle and direction of the lens assembly, and its complicated structure causes many defectives during manufacture and lowers productivity.

[8] Also, another dome type infrared ray sensor for sensing things from 360 degrees of all directions is disclosed in Japanese Patent Laid-Open No. Hl 1-118600. As shown in Figs. 1 to 3 of the Hl 1-118600, the infrared ray sensor comprises a fixed axis fixed in the center of the sensor mounting board by a fixing member, and a rotating board rotatably mounted on the fixed axis, and three deformed slits formed on the rotating board for adjusting the angle of the sensor portion. The deformed slits consist of circumferential slits which are formed in such a manner that the distance from the center of the rotating board gradually decreases and radial slits which are formed in a long hole shape outward of the radius direction of the rotating board. Accordingly, when the rotating board is turned, the angle of the vertical direction of the reflector is adjusted, so that it is possible to adjust the angle of sensing things according to the height from the ceiling to the floor.

[9] However, such a construction has disadvantages in that since many reflectors are installed, the structure is complicated and manufacturing cost is high, and since it is constructed in such a way that the sensor mounting board or the base of the case are not rotated, the reflector cannot be rotated left or right, thereby it is not capable of being adjusted left or right.

[10] Furthermore, consumer's desire for improved performance of the dome type infrared ray sensor tends to increase continuously.

[11] DETAILED DESCRIPTION OF THE INVENTION

[12] (PROBLEM TO BE SOLVED BY THE INVENTION)

[13] In order to solve such problems, a first object of the present invention is to provide a dome type infrared ray sensor, in which a lens assembly having a lens unit whose lens is angle-adjusted in the vertical direction is mounted in such a manner that it can be rotated left or right from the center of the base fixed on the ceiling, so that it is possible to adjust the left and right directions of the lens with the dome type infrared ray sensor assembled on the ceiling and it is easy to install.

[14] A second object of the present invention is to provide a dome type infrared ray sensor, in which a main printed circuit board (hereinafter, PCB) provided with a power source, a microcomputer, and a driving circuit, etc. is mounted on one side of a lens unit holder that is combined with the base from another direction, and the main PCB is located between the bottom of the lens unit holder and a rotating plate, so that assembly is very simple.

[15] A third object of the present invention is to provide a dome type infrared ray sensor, in which a main PCB provided with a power source, a microcomputer, and a driving circuit, etc. is mounted on the top of one side of a lens unit holder that is combined with the base from the other direction of the base, so that the height of the infrared sensor can be adjusted.

[16] A fourth object of the present invention is to provide a dome type infrared ray sensor, in which the rotating plate includes a power supply unit that is formed so as to be connected with electric wire, and a holder-combining portion that is combined with a plate-combining portion formed around the power supply unit, so that the lens assembly can be firmly assembled without being disengaged from the base.

[17] A fifth object of the present invention is to provide a dome type infrared ray sensor, in which if a receiver for receiving a signal detected by the lens assembled on the base is rotated, the lens unit is also rotated together with the rotating plate, so that it is possible to easily adjust the sensing range of the lens unit with the base fixed on the ceiling during installation and maintenance.

[18] A sixth object of the present invention is to provide a dome type infrared ray sensor, in which if the sensing reach of the lens is short, the infrared ray sensor is installed in the center, so that it is possible to obtain an effect of installing two sensors with one sensor, and at this time, since the lens unit holder is rotatably installed on the base, the work is very simple when installing the infrared ray sensor on the ceiling or during maintenance.

[19] A seventh object of the present invention is to provide a dome type infrared ray sensor, in which a dome-shaped cover includes a cylinder portion of a predetermined length that is inserted vertically into the vertical combining portion of the base, a semi- spherical portion that is of hemispheric shape so as to protect the lens unit, and an extended portion extended to a given length inward of the radius direction from the top end of the cylinder portion to the bottom end of the semi-spherical portion, and the cylinder portion and the semi-spherical portion are formed in one body by the extended portion, so that the dome-shaped cover is constructed small and simple.

[20] A eighth object of the present invention is to provide a dome type infrared ray sensor, in which screws inserted into the lens unit holder pass through the PCB placed on the bottom of the lens unit holder to be fastened to the bosses of the rotating plate, so that it is easy to assemble the rotating plate and the lens unit holder.

[21] And, a ninth object of the present invention is to provide a dome type infrared ray sensor, which further comprises a ring-shaped portion that is inserted into the outer circumference of a lens assembly to be adhered to the top side of the base, and an insect- proof shield that is provided with a shielding portion protruding upward from a predetermined position on the inner circumference of the ring-shaped portion to cover the power source-connecting portion of the lens assembly so as to keep insects from infiltrating.

[22] (TECHNICAL SOLUTION)

[23] In accordance with a first aspect of the present invention, there is provided a dome type infrared ray sensor comprising a base fixed on the ceiling, a lens assembly having a lens unit that is combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with the base to protect the lens assembly, the sensor further comprising: a through hole of a predetermined diameter formed in the center of said base; and a rotating plate, which is mounted in a through hole of said base so as to rotate freely together with said lens assembly, and is combined with a lens unit holder of said lens assembly while inserted into said through hole on one side of said base.

[24] Preferably, said lens assembly comprises a lens unit holder mounted on one side of said base, a lens unit rotatably mounted in the lens unit holder, and a main PCB which is mounted on one side of said lens unit holder, and is provided with a power source, a microcomputer, and a driving circuit, etc., and said main PCB is located between the bottom side of the lens unit holder and the rotating plate.

[25] Preferably, said lens assembly comprises a lens unit holder mounted on one side of said base, a lens unit rotatably mounted on the lens unit holder, and a main PCB which is mounted on one side of said lens unit holder, and is provided with a power source, a microcomputer, and a driving circuit, etc., and said main PCB is mounted on the top of said lens unit holder.

[26] Preferably, said rotating plate is provided with a power supply unit connected with electric wire, and a holder-combining portion, which is formed on the circumference of said rotating plate while surrounding the power supply unit, and is combined with the plate-combining portion of said lens unit holder.

[27] Preferably, said base includes a stopper elastically protruded on the inner circumference of a through hole.

[28] In accordance with a second aspect of the present invention, there is provided a dome type infrared ray sensor comprising a base fixed on the ceiling, a lens unit combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with said base to protect said lens unit, the sensor further comprising: a through hole of a predetermined diameter formed on the center of said base; a rotating plate which rotates freely in the through hole of said base, and at the same time, is inserted to and combined with said through hole on one side of said base, so that said lens unit can be pivoted in the vertical direction; a receiver for receiving a signal detected by the lens, which is combined with the rotating plate while surrounding said lens unit located on the center of said base, and is connected with said lens unit, and includes a main PCB having a power source, a microcomputer, and a driving circuit, etc. so as to send the sensing signal wirelessly.

[29] Preferably, said dome-shaped cover is detachably combined in a hook method with said base.

[30] Preferably, said receiver for receiving a signal detected by the lens includes a receiver housing which is combined with the lens unit housing of said lens unit, a main PCB which is connected with an element board mounted in the lens unit housing of said lens unit and is provided with a microcomputer, driving circuit, etc. so as to send the sensing signal, wherein the element board is provided with a circuit for amplifying and adjusting the sensitivity of the element, an antenna which is connected to said main PCB and is protruded toward the dome-shaped cover so as to send the sensing signal wirelessly, and a power supply unit which supplies power to said main PCB.

[31] In accordance with a third aspect of the present invention, there is provided a dome type infrared ray sensor comprising a base fixed on the ceiling, a lens unit which is combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with said base and protect said lens unit, the sensor further comprising: a through hole of a predetermined diameter formed on the center of said base; a lens unit holder which is rotatably combined with the through hole of said base; and a pair of lens units pivotably mounted on said lens unit holder, wherein the lenses of said lens unit are placed in the opposite direction each other.

[32] In accordance with a fourth aspect of the present invention, there is provided a dome type infrared ray sensor comprising a base fixed on the ceiling, a lens assembly having a lens unit and a PCB that are combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with said base and protects said lens assembly, wherein said dome-shaped cover includes a cylinder portion of a predetermined length inserted vertically into the vertical combining portion of said base, a semi-spherical portion to protect said lens unit, and an extended portion which is extended to a given length inward of the radius direction from the top end of the cylinder portion to the bottom end of the semi- spherical portion, and is placed horizontally with respect to the vertical combining portion of the base; and the cylinder portion and the semi-spherical portion are formed in one unit by the extended portion.

[33] Preferably, said base has a through hole of a predetermined length formed in the center thereof, the sensor further comprises a rotating plate which is combined with the lens unit holder of said lens assembly while inserted into said through hole on one side of said base, so as to rotate freely in the through hole of said base.

[34] Preferably, said lens unit holder is combined with said rotating plate by screws which pass through the PCB mounted on the bottom of said lens unit holder and are fastened to the bosses of said rotating plate.

[35] Preferably, the dome type infrared ray sensor further comprises an inspect-proof shield which is composed of a ring-shaped portion that is inserted on the outer circumference of the lens assembly and is adhered to the top side of the base, and a shielding portion protruded upward from a predetermined position on the inner circumference of the ring-shaped portion, wherein the shielding portion of the insect- proof shield covers a power source-connecting portion formed in the lens unit holder of the lens assembly.

[36] (EFFECT OF THE PRESENT INVENTION)

[37] According to the dome type infrared ray sensor of the present invention, installation work of the sensor is very convenient, because a rotating plate is constructed on one side of the base provided with a through hole and stopper so as to rotate freely together with the lens unit of the lens assembly, thereby the dome type infrared ray sensor can be adjusted left or right in a temporary assembled state irrespective of the monitoring direction in front.

[38] And, according to the dome type infrared ray sensor of the present invention, assembly is very simple, because a main PCB provided with a power source, a microcomputer, and a driving circuit, etc. is mounted on one side of a lens unit holder that is combined with the base from another direction, and the main PCB is located between the bottom of the lens unit holder and the rotating plate.

[39] Also, according to the dome type infrared ray sensor of the present invention, the height of the infrared ray sensor can be adjusted, because a main PCB provided with a power source, a microcomputer, and a driving circuit, etc. is mounted on the top of one side of the lens unit holder that is combined from the other direction of the base.

[40] Moreover, according to the dome type infrared ray sensor of the present invention, the lens assembly can be assembled firmly without separation from the base, because the rotating plate is provided with a power supply unit that is formed connected with electric wire and a holder-combining portion that is combined with the plate- combining portion formed around the power supply unit.

[41] Moreover, according to the dome type infrared ray sensor of the present invention, the sensing range of the lens unit can be easily adjusted with the base fixed on the ceiling during installation and maintenance, because when the receiver for receiving a signal detected by the lens assembled on the base is rotated the lens unit is also rotated together with the rotating plate.

[42] Moreover, according to the dome type infrared ray sensor of the present invention, the work of installing the infrared ray sensor on the ceiling or during maintenance is very convenient, because it is possible to obtain the effect of installing two sensors with one sensor by installing the infrared ray sensor in the center if the sensing reach of the lens is short, and at this time the lens unit holder is rotatably installed on the base.

[43] Moreover, according to the dome type infrared ray sensor of the present invention, it is possible to prevent a thing like a wardrobe from getting caught when it is being moved, because it is possible to provide a dome type infrared ray sensor with a simple and small shape since the radius of curvature of the hemispheric shape on the top of the dome becomes small and space can be secured by that much by an extended portion formed on the dome-shaped cover. [44] Moreover, according to the dome type infrared ray sensor of the present invention, it is possible to freely adjust the sensing angle of the lens unit installed in the lens unit holder of the lens assembly, because the lens assembly and the rotating plate are rotating on the base. [45] Moreover, according to the dome type infrared ray sensor of the present invention, the work of the installation or maintenance for the sensor is easy because it is possible to assemble the lens unit holder and the rotating plate by inserting screws downward on the conveyor of the assembly line. [46] Moreover, according to the dome type infrared ray sensor of the present invention, it is possible to keep insects from infiltrating into the lens through the hole for fixing the base on the ceiling and the power source connector, by providing the ring-shaped portion and the cover portion of the insect-proof shield. [47] BRIEF DESCRIPTION OF THE DRAWINGS

[48] These and other features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description, taken accompanying drawings. In the drawings: [49] Fig. 1 is a sectional view of a dome type infrared ray sensor according to a first embodiment of the present invention; [50] Fig. 2 is a plan view showing how a rotating plate is inserted into the bottom of the base through a through hole of the base according to the first embodiment of the present invention; [51] Fig. 3 is an exploded perspective view of the dome type infrared ray sensor according to the first embodiment of the present invention; [52] Fig. 4 is an exploded view showing the assembled state of the dome type infrared ray sensor according to the first embodiment of the present invention; [53] Fig. 5 is an exploded perspective view of a dome-shaped cover in a dome type infrared ray sensor according to a second embodiment of the present invention; [54] Fig. 6 is an exploded perspective view of a dome type infrared ray sensor with the dome-shaped cover excluded from Fig. 5;

[55] Fig. 7 is a sectional view taken along line A-A of Fig. 5;

[56] Fig. 8 is a perspective view of the major parts showing a dome type infrared ray sensor according to a third embodiment of the present invention; [57] Fig. 9 is an exploded view of a dome type infrared ray sensor according to a fourth embodiment of the present invention; [58] Fig. 10 is an exploded view showing how an insect-proof shield is installed on a dome type infrared ray sensor according to the fourth embodiment of the present invention; and [59] Fig. 11 is a sectional view showing the assembled state of the infrared ray sensor of Fig. 10.

[60] BEST MODE FOR CARRYING OUT THE INVENTION

[61] Below will be given detailed description of the construction and operation of a dome type infrared ray sensor according to a first embodiment of the present invention with reference to the accompanying drawings. In the drawings, Fig. 1 is a sectional view of a dome type infrared ray sensor according to a first embodiment of the present invention, Fig. 2 is a plan view showing how a rotating plate is inserted into the bottom of the base through a through hole of the base according to the first embodiment of the present invention, Fig. 3 is an exploded perspective view of the dome type infrared ray sensor according to the first embodiment of the present invention, and Fig. 4 is an exploded view showing the assembled state of the dome type infrared ray sensor according to the first embodiment of the present invention.

[62] The dome type infrared ray sensor 1000 of the present invention is composed of a base 1100, a lens assembly 1200, a rotating plate 1300 and a dome-shaped cover 1400.

[63] Here, as shown in Figs. 1 to 4, the base 1100 includes cover mounting portions

1110 by which the dome-shaped cover 1400 is detachably installed and mounting slots 1120 which have rectangular shapes and long-hole shapes for easy fixing on the ceiling, while a through hole 1130 having a predetermined diameter is formed in the center. And, on the inner circumference of the through hole 1130 is formed a stopper 1140 for easy adjustment of the rotary quantity of a rotating plate 1300. In the first embodiment of the present, the stopper 1140 has an engaging protrusion protruded to a given height from the inner circumference of the through hole 1130, and is combined elastically with the rotating plate 1300. The stopper 1140 may be formed on the top side or bottom side around the through hole 1130 or in a concavely recessed form.

[64] And, the infrared ray sensor 1000 comprises a rotating plate 1300 which is inserted into the through hole 1130 from one side (for example, lower side in the drawing) of the base 1100, a lens unit holder 1210 which is joined to the base from one side (for example, upper side in the drawing) of the base 1100, a lens unit 1220 which is pivotably mounted on the lens unit holder 1210 by a hinge structure, and a main PCB 1230 which is joined with the rotating plate 1300 by screws 500 while placed on the top side of the lens unit 1210 and is provided with a power source, a microcomputer, and a driving circuit, etc.

[65] Here, the lens unit holder 1210 includes a plate-combining portion 1211 which is formed on the bottom side facing the rotating plate 1300 in such manner that it can be rotated 360 degrees within the through hole 1130 of the base 1100 while combined with the rotating plate 1300, and a lens mounting portion 1212 which is formed on the top side for mounting the lens unit 1220. In this embodiment, the plate-combining portion 1211, inserted in the through hole 1130, comprises a boss mounting portion 121 Ia in which one of saw-toothed positioning protrusions 1311 formed on the outer circumference of the base 1100 is placed, and a boss 1211b which is protruded toward the bottom side to be fastened by screws 500. The protrusion 1311 of the rotating plate 1300 is engaged by a hook, which is the stopper 1140 formed on the base 1110, enabling rotation in one direction of the lens unit 1220 while obstructing rotation in the opposite direction.

[66] The lens unit 1220 comprises a lens case member 1221 which is rotatably mounted on a lens mounting portion 1212 within a predetermined range of angle, a lens 1222 which is mounted on the lens case member 1221 and has a multi step reflector 1221a provided on the inner side, an element board 1223 which includes a circuit for amplifying and adjusting the sensitivity of an element to be described later, and a py- roelectric element 1224 which is installed on the element board 1223 facing the reflector 1221a.

[67] Meanwhile, in the main PCB 1230 are formed a screw hole 1231 for a screw to be inserted and a through hole 1232 for the power supply unit 1310 to pass through. In this embodiment, the main PCB 1230 is shown to be located under the lens unit holder 1210, but it can be mounted also over the lens unit holder 1210. If the main PCB 1230 is mounted over the lens unit holder 1210, as shown in Fig. 1, extra space for mounting the main PCB 1230 is not necessary unlike in the structure in which it is installed under the lens unit holder 1210 and on the rotating plate 1300, so the installation height of the lens unit 1220 can be made low.

[68] And, the plate-shaped rotating plate 1300 is provided with a power supply unit

1310, which is formed on the top connected with electric wire, and a holder-combining portion 1320, which is formed on the circumference of the rotating plate 1300 while surrounding the power supply unit 1310, and is combined with the plate-combining portion 1211 of the lens unit holder 1210. The holder-combining portion 1320 can use a combining method that uses a hook, but in this embodiment a screw method is used. For this, the holder-combining portion 1320 of the rotating plate 1300 are provided with fixing portions 1322 for the screws 500 to be inserted and one of saw-toothed positioning protrusions 1311 formed on the circumference of the rotating plate 1300 so as to be engaged with the stopper 1140 of the base 1100.

[69] And, the dome-shaped cover 1400 is of dome shape, and in the opened circumference portion are formed engaging slots 1410 for disengageable combination with the cover mounting portions 1110 of the base 1100.

[70] Meanwhile, Figs. 5 to 7 are drawings illustrating a dome type infrared ray sensor according to a second embodiment of the present invention. The dome type infrared ray sensor 2000 of this embodiment comprises a base 2100 fixed on the ceiling, a lens unit 2200 combined with the base 2100 so as to enable the sensing angle adjustment in the vertical direction, and a dome-shaped cover 2400 which is placed in the center of the base 2100 to protect the lens unit 2200. In the center of the base 2100 is formed a through hole 2130 having a predetermined diameter. And, the infrared ray sensor 2000 comprises a rotating plate 2300, which is inserted into the through hole 2130 from one side (for example, lower side in the drawing) of the base 2100 so as to freely rotate in the through hole 2130 of the base 2100 and, at the same time, is rotatably combined with the lens unit 2200 by a hinge structure, and a receiver 2500 for receiving a signal detected by a lens of the lens unit 2200, which is combined with the rotating plate 2300 while surrounding the lens unit 2200 located in the center of the base 2100. The receiver 2500 for receiving a signal detected by the lens has a main PCB, which is provided with a power source, a microcomputer, and a driving circuit, etc. that are connected with the lens unit 2200 so as to send the sensing signal wirelessly.

[71] Accordingly, if the receiver 2500 assembled to the base 2100 is rotated, the rotating plate 2300 is also rotated together with the lens unit 2200, so the sensing range can be easily adjusted with the base 2100 fixed during installation or maintenance of the sensor.

[72] Next, assemble the dome-shaped cover 2400 between the base 2100 and the receiver 2500 for receiving a signal detected by the lens.

[73] Here, the base 2100 are provided with mounting slots 2110 having rectangular shape and long hole shape for easy fixing on the ceiling and a hook 2120 for dis- engageable combination with engaging slots 2410 formed on the outer circumference of the dome-shaped cover 2400. In the center of the base 2100 is formed a through hole 2130 having a diameter of a predetermined size.

[74] And, the lens unit 2200 comprises a lens unit housing 2210, which is pivotably mounted on the rotating plate 2300 by a hinge structure, and an element board 2220 which is installed in the lens unit housing 2210, and lens 2230 which is installed in the lens unit housing 2210.

[75] Also, the rotating plate 2300 is provided with a support 2310, which has the lens unit housing 2210 installed pivotably by a hinge structure, and a circular rim 2320, which is formed on the circumference of the rotating plate 2300. When the rotating plate 2300 is mounted on the base 2100, the plate 2300 is prevented from breaking away from the base 2100 by the rim 320.

[76] Meanwhile, the dome-shaped cover 2400 has engaging slots 2410 formed on the bottom circumference for disengageable combination with the hook 2120 of the base 2100 during assembly.

[77] The receiver 2500 for receiving a signal detected by the lens comprises a receiver housing 2510 which is combined with the lens unit housing 2210 of the lens unit 2200, a main PCB 2520 which is connected with an element board 2220 mounted in the lens unit housing 2210 of the lens unit 2200 and is provided with a microcomputer, driving circuit, etc. so as to send the signal detected by the lens 2230, an antenna 2530 which is connected to the main PCB 2520 and is protruded toward the dome-shaped cover 2400 so as to send the sensing signal wirelessly, and a power supply unit 2540 which supplies power to the main PCB 2520. The element board 2220 is provided with a circuit for amplifying and adjusting the sensitivity of the element.

[78] Accordingly, when the receiver 2500 receives the signal that has detected a trespasser by the lens 2230 of the lens unit 2200, the element board 2220 amplifies the sensitivity and forwards it to the main PCB 2520, and the amplified signal is forwarded through the antenna 2520 to the home automation (not shown), for example.

[79] Fig. 8 is a perspective view of the major parts showing a dome type infrared ray sensor according to a third embodiment of the present invention. In this embodiment, the infrared ray sensor, in contrast to the aforementioned embodiments, has a structure in which two lens units are installed in the lens unit holder that is rotatably installed in the through hole of the base.

[80] Namely, the dome type infrared ray sensor according to the third embodiment comprises a lens unit holder 3300 which is rotatably installed on the base (for instance, 1100 and 2100 of the first embodiment and the second embodiment) fixed on the ceiling, and a pair of lens units 3400, which are pivotably installed in the lens unit holder 3300, and the lens 3410 installed in the pair of lens units 3410 are placed in the opposite direction each other.

[81] In the lens unit holder 3300 are formed two lenses mounting portions 3310 for the pair of lens units 3400 to be installed.

[82] Accordingly, if the sensing reach of the lens 3410 is short, the dome type infrared ray sensor of such a structure is installed in the center; thereby it is possible to obtain the effect of installing two infrared ray sensors with one infrared ray sensor. At this time, since the lens unit holder 3300 is rotatably installed on the base, it is possible to work very conveniently when installing the infrared ray sensor on the ceiling or during maintenance.

[83] Figs. 9 to 11 show a dome type infrared ray sensor according to a fourth embodiment of the present invention. A dome type infrared ray sensor according to this embodiment comprises a base 4100 fixed on the ceiling, a lens assembly 4200 which is having a lens unit 4210 and a PCB 4220 that are installed so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover 4300 which is installed in the center of base 4100 to protect the lens assembly 4200. The dome- shaped cover 4300 is provided with a cylinder portion 4310 of a predetermined length that is vertically inserted into the vertical combining portion of the base 4100, a semi- spherical portion 4330 to protect the lens unit 4210, and an extended portion 4320 which is extended to a given length inward in the direction of radius from the top end of the cylinder portion 4310 to the bottom end of the semi-spherical portion 4330 to be placed horizontally with respect to the vertical combining portion of the base 4100; and the cylinder portion 4310. The semi-spherical portion 4330 is formed in one body by the extended portion 4320.

[84] Here, in the cylinder portion 4310 are formed engaging slots 4311 for dis- engageable combination with the base 4100.

[85] Accordingly, since the radius of curvature of the semi-spherical portion 4330 is decreased by the extended portion 4320 formed on the dome-shaped cover 4300, a simple and small dome type infrared ray sensor is provided. Thus, the occupying space is reduced by as much as the decrease of the radius of curvature, so a thing such as a wardrobe won't get caught when it is being moved.

[86] And, the base 4100 has a through hole 4110 of a given diameter formed in the center, and in the through hole 4110 of the base is mounted a rotating plate 4400 so as to rotate freely. During assembly, the rotating plate 4400 is inserted into the through hole 4110 from one side (for example, lower side in the drawing) of the base 4100, and then it is combined with the lens unit holder 4230 of the lens assembly 4400.

[87] Accordingly, since the lens assembly 4200 is rotatably mounted on the base with the rotating plate 4400, it is possible to adjust the sensing angle of the lens unit 4210 installed in the lens unit holder 4230 of the lens assembly 4200 freely up and down or left and right.

[88] Also, the lens unit holder 4230 is combined with the rotating plate 4400 by screws that pass through the PCB 4220 mounted on the bottom of the lens unit holder 4230 and are fastened to bosses 4410 of the rotating plate 4400.

[89] Accordingly, since it is possible to fasten by inserting screws from up to down from the lens unit holder 4230 to the rotating plate 4400 on the conveyor of the assembly line unlike the dome type infrared ray sensor of the first embodiment, assembly work is easy.

[90] And, the dome type infrared ray sensor of this embodiment is provided further with a ring-shaped portion 4510, which is inserted into the outer circumference of the lens assembly unit 4220 and is adhered to the top side of the base 4100, and an insect-proof shield 4500, which is made of a shielding portion 4520 protruding upward from a predetermined location on the inner circumference of the ring-shaped portion 4510. The shielding portion 4520 of this insect-proof shield 4500 covers a power source- connecting portion 4231 formed in the lens unit holder 4230 of the lens assembly 4200.

[91] Therefore, insects are prevented from infiltrating through holes 4120 and 4130 for fixing the base 4100 on the ceiling and the power source-connecting portion 4231, by the ring-shaped portion 4510 and the shielding portion 4520 of the insect-proof shield 4500. [92] INDUSTRIAL APPLICABILITY

[93] As described above, installation work of the dome type infrared ray sensor is very convenient, because a rotating plate is constructed on one side of the base provided with a through hole and stopper so as to rotate freely together with the lens unit of the lens assembly, thereby the dome type infrared ray sensor can be adjusted left or right in a temporary assembled state irrespective of the monitoring direction in front.

[94] Although the present invention has been described in connection with the exemplary embodiments illustrated in the drawings, it is only illustrative. It will be understood by those skilled in the art that various modifications and equivalents can be made to the present invention. Therefore, the true technical scope of the present invention should be defined by the appended claims.

Claims

[1] A dome type infrared ray sensor comprising a base 1100 fixed on the ceiling, a lens assembly 1200 having a lens unit 1220 that is combined with the base 100 so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover 1400 which is detachably combined with the base 1100 to protect the lens assembly 1200, the sensor further comprising: a through hole 1130 of a predetermined diameter formed in the center of said base 1100; and a rotating plate 1300, which is mounted in a through hole 1130 of said base 1100 so as to rotate freely together with said lens assembly 1200, and is combined with a lens unit holder 1210 of said lens assembly 1200 while inserted into said through hole 1130 on one side of said base 1100.

[2] The dome type infrared ray sensor of claim 1, wherein said lens assembly 1200 comprises a lens unit holder 1210 mounted on one side of said base 1100, a lens unit 1220 rotatably mounted in the lens unit holder 1210, and a main PCB 1230 which is mounted on one side of said lens unit holder 1210, and is provided with a power source, a microcomputer, and a driving circuit, etc., and said main PCB 1230 is located between the bottom side of the lens unit holder 1210 and the rotating plate 1300.

[3] The dome type infrared ray sensor of claim 1, wherein said lens assembly 1200 comprises a lens unit holder 1210 mounted on one side of said base 1100, a lens unit 1220 rotatably mounted on the lens unit holder 1210, and a main PCB 1230 which is mounted on one side of said lens unit holder 1210, and is provided with a power source, a microcomputer, and a driving circuit, etc., and said main PCB 1230 is mounted on the top of said lens unit holder 1210.

[4] The dome type infrared ray sensor of claim 1 or 3, wherein said rotating plate 1300 is provided with a power supply unit 1310 connected with electric wire, and a holder-combining portion 1320, which is formed on the circumference of said rotating plate 1300 while surrounding the power supply unit 1310, and is combined with the plate-combining portion 1211 of said lens unit holder 1210.

[5] The dome type infrared ray sensor of claim 1, wherein said base 1100 includes a stopper 1140 elastically protruded on the inner circumference of a through hole 1130.

[6] A dome type infrared ray sensor comprising a base 2100 fixed on the ceiling, a lens unit 2200 combined with the base 2100 so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover 2400 which is detachably combined with said base 2100 to protect said lens unit 2200, the sensor further comprising: a through hole 2130 of a predetermined diameter formed on the center of said base 2100; a rotating plate 2300 which rotates freely in the through hole 2130 of said base

2100, and at the same time, is inserted to and combined with said through hole

2130 on one side of said base 2100, so that said lens unit 2200 can be pivoted in the vertical direction; a receiver 2500 for receiving a signal detected by the lens, which is combined with the rotating plate 2300 while surrounding said lens unit 2200 located on the center of said base 2100, and is connected with said lens unit 2200, and includes a main PCB having a power source, a microcomputer, and a driving circuit, etc. so as to send the sensing signal wirelessly.

[7] The dome type infrared ray sensor of claim 6, wherein said dome-shaped cover 2400 is detachably combined in a hook method with said base 2100.

[8] The dome type infrared ray sensor of claim 6 or 7, wherein said receiver 2500 for receiving a signal detected by the lens includes a receiver housing 2510 which is combined with the lens unit housing 2210 of said lens unit 2200, a main PCB 2520 which is connected with an element board 2220 mounted in the lens unit housing 2210 of said lens unit 2200 and is provided with a microcomputer, driving circuit, etc. so as to send the sensing signal, wherein the element board 2220 is provided with a circuit for amplifying and adjusting the sensitivity of the element, an antenna 2530 which is connected to said main PCB and is protruded toward the dome-shaped cover 2400 so as to send the sensing signal wirelessly, and a power supply unit 2540 which supplies power to said main PCB 2520.

[9] A dome type infrared ray sensor comprising a base fixed on the ceiling, a lens unit which is combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with said base and protect said lens unit, the sensor further comprising: a through hole of a predetermined diameter formed on the center of said base; a lens unit holder 3300 which is rotatably combined with the through hole of said base; and a pair of lens units 3400 pivotably mounted on said lens unit holder 3300, wherein the lenses of said lens unit 3400 are placed in the opposite direction each other.

[10] A dome type infrared ray sensor comprising a base 4100 fixed on the ceiling, a lens assembly 4200 having a lens unit 4210 and a PCB 4220 that are combined with the base so as to adjust the sensing angle of the vertical direction, and a dome-shaped cover which is detachably combined with said base 4100 and protects said lens assembly 4200, wherein said dome-shaped cover 4300 includes a cylinder portion 4310 of a predetermined length inserted vertically into the vertical combining portion of said base 4100, a semi-spherical portion 4330 to protect said lens unit 4210, and an extended portion 4320 which is extended to a given length inward of the radius direction from the top end of the cylinder portion 4310 to the bottom end of the semi-spherical portion 4330, and is placed horizontally with respect to the vertical combining portion of the base 4100; and the cylinder portion 4310 and the semi-spherical portion 4330 are formed in one unit by the extended portion 4320.

[11] The dome type infrared ray sensor of claim 10, wherein said base 4100 has a through hole 4110 of a predetermined length formed in the center thereof, the sensor further comprises a rotating plate 4400 which is combined with the lens unit holder 4230 of said lens assembly 4200 while inserted into said through hole 4110 on one side of said base 4100, so as to rotate freely in the through hole 4110 of said base 4100.

[ 12] The dome type infrared ray sensor of claim 11 , wherein said lens unit holder 4230 is combined with said rotating plate 4400 by screws which pass through the PCB 4220 mounted on the bottom of said lens unit holder and are fastened to the bosses 4410 of said rotating plate 4400.

[13] The dome type infrared ray sensor of any of claims 10 to 12, further comprising an inspect-proof shield which is composed of a ring-shaped portion 4510 that is inserted on the outer circumference of the lens assembly 4200 and is adhered to the top side of the base 4100, and a shielding portion 4520 protruded upward from a predetermined position on the inner circumference of the ring-shaped portion 4510, wherein the shielding portion 4520 of the insect-proof shield 4500 covers a power source-connecting portion 4231 formed in the lens unit holder 4230 of the lens assembly 4200.