AU2015222487B2

AU2015222487B2 - Infrared motion detector

Info

Publication number: AU2015222487B2
Application number: AU2015222487A
Authority: AU
Inventors: Lothar Blomberg; Dirk Petrus Gijsbertus DE JAGER; Jurgen Kemper; Werner Lisson; Ortwin Schrage
Original assignee: ABB Schweiz AG
Current assignee: ABB Schweiz AG
Priority date: 2014-02-28
Filing date: 2015-01-20
Publication date: 2017-12-07
Anticipated expiration: 2035-01-20
Also published as: WO2015128114A1; CN106461456A; EP3111176A1; EP3111176B1; DE102014002686A1; DE102014002686B4; AU2015222487A1; CN106461456B

Abstract

The invention relates to a passive infrared motion detector comprising a base part (9) which holds a printed circuit board (7) with at least four passive IR sensors (8), IR receiver (7.1), brightness sensor (7.3) and further electronic components, a mirror arrangement (5) and a rectangular lens arrangement (3). The base part (9) is covered by a cover part (1), wherein preferably four spherical-cap-shaped and/or frustum-shaped lenses (3.1) with in each case a plurality of lens segments for registering motion are arranged in the corner regions of the rectangular lens arrangement (3). The mirror arrangement are arranged under the lens arrangement (3) is provided to increase the optical resolution of the lens arrangement (3), wherein the effective surfaces (5.1) of said mirror arrangement are provided with a reflecting coating. The cover part (1) situated over the lens arrangement (3) comprises a centrally arranged plastic web (1.1) with at least two openings (1.3), into which transparent cap parts (2) are inserted. Light channels (5.2), (5.3), which interact with the IR receiver (7.1) and brightness sensor (7.3) lying therebelow, are arranged under the cap parts (2).

Description

Infrared motion detector Field of the Invention

The invention relates to an infrared motion detector having at least one externally visible lens arrangement.

Background to the Invention

Infrared motion detectors, in which thermal radiation originating from persons is focused via an externally visible lens and guided to internal passive infrared sensors, are generally known and are described, for example, in EP 1 148 455 B1. The output voltage arising at the sensors in this case is converted into a switching signal via analysis electronics and used for switching external lighting or room lighting, for example .

Known motion detectors, also referred to as presence detectors hereafter, typically have lenses in the form of spherical caps, which protrude downward out of the housing enclosing the lens, so that unobstructed detection of the thermal radiation, which is supplied to the passive infrared sensors, is possible.

The presence detectors and motion detectors also require information about the ambient brightness, since a switching action is possibly only to be performed upon falling below a specific light threshold. For this purpose, corresponding ambient light sensors are integrated into the motion detector, wherein the light is supplied to the light sensor either via the fraction which is scattered in via the lens or via a light guide rod separately provided for this purpose, also referred to as an optical spherical cap, and analyzed accordingly.

An (active) infrared receiver and a signal LED are optionally also integrated into the housing of the presence detector, to trigger specific actions, such as turning the light on and off, via an infrared (IR) remote control or to transmit items of status information so they are externally visible, respectively. In this case, depending on the embodiment, the signals (incoming IR signal or outgoing LED signal, respectively) are also guided via the lens or via separate IR or light guides.

In the known arrangements, which use spherical caps or light guide rods, these are situated in the edge region of the housing, which comprises the protruding lens.

The conventional arrangements, in which the signals for the detection of the ambient brightness, the detection of IR remote control signals, and the output of LED light signals are guided via the lens bodies, are subject to the following disadvantages in particular: - If transparent lenses are used, there is restricted IR remote control capability, which is caused due to transmission losses of the lens in the relevant wavelength range. A diffuse LED light signal is also not well recognizable during the day. - If colored lenses are used, detection of the ambient brightness and recognizable output of an LED light signal via the lens bodies are provided only inadequately or not at all.

If the signals for the detection of the ambient brightness, the detection of IR remote control signals, and the output of the LED light signals are guided via light guides in the lens-comprising edge region of the housing, the lens body protruding from the housing therefore causes optical shading and thus restricted detection of the ambient brightness, the IR remote control capability, and the recognition of the LED light signal.

Summary of the Invention

The infrared motion detector according to the invention comprises a housing part or base part, which accommodates a printed circuit board having at least four passive IR sensors, an IR receiver, a brightness sensor, and further electronic components, a mirror arrangement, and a rectangular lens arrangement and is covered by the cover part. The cover part is preferably latched on the base part by means of a catch connection .

Preferably four lenses, in the form of spherical caps and/or truncated cones, each having multiple lens segments are arranged in the corner regions of the rectangular lens arrangement for the motion detection. The lenses of the lens arrangement can be embodied as arbitrarily formed sections of Fresnel lenses.

According to the invention, the cover part forms a centrally arranged plastic web, which has at least two openings, into which transparent cap parts are incorporated. Light channels, which can optionally be equipped with light guides, and which are located above IR receiver and brightness sensor and interact with them, are located below the cap parts. The detection of ambient brightness, remote control signals, and the output of the light signals provided by the motion detector, which are preferably LED light signals, takes place via the web, which engages centrally in the lens arrangement and is formed from plastic, and which interacts with the relevant light channels and/or light guides for this purpose. Due to the introduction of the light guides into the plane of the lowest protruding lens surface, symmetrical and unrestricted detection and output of the described signals is provided.

The rectangular lens arrangement is formed from two opposing multilens parts in the form of truncated cones and/or spherical caps, which each have two lenses having multiple lens segments. A middle region, which accommodates the web of the cover part, and is embodied as a recess, is provided between the multilens parts.

In one preferred embodiment, the cover part is equipped with multiple, preferably four holding ribs, which hold the cover part in the base part. The holding ribs engage for this purpose in holding pockets provided on the cover part. Centering ribs are optionally provided on the cover part for exact positioning of the cover part in relation to the base part, which ribs engage in corresponding centering recesses of the base part.

The mirror arrangement, which is located below the lens arrangement and/or is covered thereby, is provided to increase the optical resolution of the lens arrangement. The active surfaces of the mirror arrangement and the respective associated passive IR sensors are arranged in relation to one another so that the active surfaces of the lens arrangement supply mirror images of the associated IR sensors. Furthermore, the active surfaces of the mirror arrangement are provided with a high-quality coating, to achieve the highest possible degree of reflection.

In one preferred embodiment, the mirror arrangement has support surfaces, which support and stabilize the rear of the lens arrangement arranged above it. Furthermore, the mirror arrangement forms a receptacle device for a programming plunger and the light channels for brightness sensor and IR receiver.

The programming plunger interacts with a programming button of the motion detector, which is arranged on the printed circuit board, and is provided to put the motion detector in a programming mode, optionally also via an IR remote control.

Brief Description of the Drawings

The invention, further embodiments, and further advantages will be described in greater detail on the basis of the exemplary embodiments illustrated in the drawings .

In the figures:

Figure 1 shows an exemplary perspective "exploded view" of the motion detector according to the invention,

Figure 2 shows a perspective view of a first embodiment of the lens arrangement,

Figure 3 shows a perspective view of a second embodiment of the lens arrangement,

Figure 4 shows a sectional view of an exemplary embodiment of the motion detector according to the invention,

Figure 5 shows a top view of an exemplary embodiment of the motion detector according to the invention,

Figure 6 shows an exemplary embodiment of the cover of the base part by means of a catch connection between the base part and the cover part, Figure 7 shows an exemplary embodiment of the fastening of the motion detector according to the invention,

Figure 8 shows a further exemplary embodiment of the fastening of the motion detector according to the invention.

Detailed Description

Figure 1 shows an exemplary perspective "exploded view" of the motion detector according to the invention, which is primarily composed of a cover part 1, a lens arrangement 3, a mirror arrangement 5, a printed circuit board 7, and a base part 9.

The cover part 1 is equipped with a centrally arranged plastic web 1.1, which can be placed on a recess 3.2 of the lens arrangement 3.

The plastic web 1.1 has openings 1.3, into which transparent caps 2 can be introduced. Light channels 5.2, 5.3, which can optionally accommodate light guides, are guided below the transparent caps 2, wherein the light guides plunge through the lens arrangement 3 geometrically in a region in which no motion detection is required.

The mirror arrangement 5, the primary object of which is to increase the optical resolution of the optical

system, is located below the lens arrangement 3. The active surfaces 5.1 of the mirror arrangement are positioned exactly in relation to four passive IR sensors 8 located in the corner regions of the lens arrangement 3, so that the infrared radiation which is emitted from a moving body (person) is relayed very precisely to the passive IR sensors 8.

The passive IR sensors 8 are situated with an IR receiver, a brightness sensor, and further electronic components on the printed circuit board 7. A further function of the mirror arrangement 5 is based on the stabilization of the lens arrangement 3. Since typically thin-walled lenses are preferred, the mirror arrangement 5 securely supports the lenses of the lens arrangement 3 on the rear with its support surfaces 5.4, to thus prevent unintentional pressing in of the lens arrangement 3, for example, during the installation of the motion detector in a false ceiling, also known as a suspended ceiling.

In addition, the mirror arrangement 5 forms a receptacle 5.5 in its center for a programming plunger 4 and for the light channels 5.2, 5.3 for optionally accommodating the light guides.

The light channel 5.2, which interacts with the IR receiver, is extendable with a cap 6 up to the printed circuit board 7, so that the IR receiver is completely enclosed by the cap 6. Therefore, only those signals which pass through the light channel 5.2 are received by the IR receiver. The IR receiver therefore has a very narrow reception characteristic and the motion detector can be advantageously aimed at intentionally using a remote control, whereby unintentional addressing of adjacent presence detectors is nearly precluded.

For installation of the motion detector, for example, in the false ceiling or in a surface box, a power connection terminal 12, a line tension relief 13, and mounting springs 10 are required and are provided as accessories .

Figures 2 and 3 show two exemplary embodiments of the lens arrangement 3, also referred to as a multilens hereafter, of the motion detector according to the invention, which merely influence the external dimensions and the detection range of the motion detector. In both embodiments, the multilens 3 has a flat shape, in the corner regions of which four lenses 3.1 and four corresponding passive IR sensors 8 for the motion detection are located.

The recess 3.2, also called the central region, of the multilens 3 is slightly set back, so that the web 1.1 of the cover part 1 plunges therein. The analogous openings to the openings in the plastic web 1.1 are also located in the middle region 3.2 of the lens arrangement 3.

The multilens 3 according to the first embodiment (see Figure 2) has the form of a 1/4 spherical cap having 12 lens segments 3.1.1.

The multilens 3 according to the second embodiment (see Figure 3) has the form of a 1/4 spherical cap having 1/4 truncated cone having 18 lens segments 3.1.1. The motion detector according to Figure 3 is thus constructed somewhat taller and wider as a whole, whereby the detection range thereof is enlarged.

Figure 4 shows a sectional view of the motion detector having the base part 9, which accommodates the printed circuit board 7 having the four passive IR sensors 8, the IR receiver 7.1, the brightness sensor 7.3, and a programming button 7.2, the mirror arrangement 5, and the rectangular multilens 3, which are covered using the cover part 1. The base part 9 is fastenable by means of two mounting springs 10 in a false ceiling opening.

The plastic web 1.1 of the cover part 1 is arranged centrally above the lens arrangement 3. The cover part 1 is not screwed onto the base part 9 as is typical, but rather is latched onto the base part 9. This reduces the manufacturing passage times and therefore the production costs of the motion detector.

Furthermore, this solution has the advantage that the cover part 1 is held at four points in the base part 9. This can be inferred from Figure 6.

Two openings 1.3 are shown in the middle region in the web 1.1 of the cover part 1. A transparent cap 2 for IR receiver 7.1 and for brightness sensor 7.3 are each attached in the openings 1.3 below the web 1.1. Light channels 5.2 and 5.3 for the IR receiver 7.1 and for the brightness sensor 7.3 are located directly below the two caps 2.

The light channels 5.2 and 5.3 are fixed components of the mirror arrangement 5. The length of the light channel 5.2 for the IR receiver 7.1 is somewhat shorter than the length of the light channel 5.3 for the brightness sensor 7.3. A presence detector variant having a broad reception characteristic (active IR) may thus be implemented, since additional signals may be received by the IR receiver 7.1, which penetrate the multilens 3.

The light channel 5.2 is extended using a cap 6 up to the printed circuit board 7, so that the IR receiver 7.1 is completely enclosed by the cap 6. Therefore, only the signals which pass through the light channel 5.2 are received by the IR receiver 7.1.

The light channel 5.3 is designed so that it completely encloses the brightness sensor 7.3 and does not permit the entrance of scattered light through the multilens 3 to the brightness sensor 7.3. A desired restriction of the field of vision of the brightness detection is thus performed. A further opening 1.4 for the programming plunger 4, by means of which the programming button 7.2 is actuable and which, after the actuation, returns by way of the two spring arms 4.1 shown in Figure 5 into the starting position, is located in the center of the motion sensor between the openings 1.3.

Figure 5 shows a top view of an exemplary embodiment of the motion detector according to the invention before the mounting of the cover part 1 and the multilens 3.

The 2x4 support surfaces 5.4 of the mirror arrangement 5 are used to stabilize the multilens 3. In addition, the mirror arrangement 5, as already mentioned, forms the receptacle for the programming plunger 4 and the light channels 5.2, 5.3.

Figure 6 shows an example of how the cover of the base part 9 is embodied by means of a catch connection between the base part 9 and the cover part 1. For this purpose, four holding ribs 9.1 are located on the base part 9, which engage in corresponding holding pockets 1.5 provided on the cover part 1. Preferably two centering ribs 1.2 are attached to the cover part 1 for exact positioning of the cover part 1 in relation to the base part 9, which engage in corresponding centering recesses 9.2 of the base part 9.

Figure 7 shows a view of the rear of the motion detector according to the invention, which is inserted into a false ceiling 15 by means of the two mounting springs 10 in a false ceiling opening. In order that the motion detector provides the flattest possible appearance after its installation, a substantial part of the motion detector plunges similarly to a flush-mounted insert into the wall or ceiling 15. A corresponding recess/bore hole in the wall 15 is used for this purpose, which accommodates the lower circular region of the base part 9, after the lines protruding out of the ceiling 15 have been connected by means of the line connection terminal 12 and the tension relief 13 to the motion detector.

This recess/borehole is not present in a solid ceiling and also cannot be introduced later. Figure 8 shows for this purpose a solution according to the invention for the installation of the motion detector on a solid ceiling 15. For this purpose, firstly the surface box 14 is fastened on the ceiling, for example, screwed on. After the connection of the line, the motion detector is mounted on the surface box 14 using a quarter turn according to the bayonet fitting principle by means of holding tabs 14.1 provided in the surface box 14 and associated holding tongues 14.2 provided in the base part 9 of the motion detector. The mounting springs 10 are no longer required here.

The installed surface box 14 is also advantageously provided, in addition to the receptacle of the motion detector, as a storage space for required lines and can additionally function as a further design part.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention .

Reference herein to background art does not constitute an admission that the art forms a part of the common general knowledge in the art, in Australia or any other country.

List of reference numerals 1 cover part 1.1 web 1.2 centering rib 1.3 opening 1.4 further opening 1.5 holding pocket 2 transparent cap 3 lens arrangement, multilens 3.1 lens 3.1.1 lens segment 3.2 recess, center region 4 programming plunger 4.1 spring arm 5 mirror arrangement 5.1 active surface of the mirror arrangement 5.2 light guide, light channel for brightness sensor 5.3 light guide, light channel for IR receiver 5.4 support surface 6 cap 5.5 receptacle for programming plunger 7 printed circuit board 7.1 receiver 7.2 programming button 7.3 brightness sensor 8 passive IR sensors 9 base part 9.1 holding rib 9.2 centering recesses 10 mounting spring 12 line connection terminal 13 line tension relief 14 surface box 14.1 holding tab 14.2 holding tongue 15 false ceiling, suspended ceiling

Claims

The claims defining the invention are as follows:

1. A passive infrared motion detector having a base part, which accommodates a printed circuit board having at least four passive IR sensors, an IR receiver, a brightness sensor, and further electronic components, a mirror arrangement, and a rectangular lens arrangement, which are covered using a cover part, wherein - four lenses, in the form of spherical caps and/or truncated cones, each having multiple lens segments, are arranged in the corner regions of the rectangular lens arrangement for the motion detection, - the mirror arrangement arranged below the lens arrangement is provided for increasing the optical resolution of the lens arrangement, wherein the active surfaces thereof are provided with a reflective coating, wherein - the cover part located above the lens arrangement has a centrally arranged plastic web having at least two openings, into which transparent cap parts are incorporated, and - light channels are arranged under the cap parts which interact with the IR receiver and brightness sensor located underneath.
2. The passive infrared motion detector as claimed in claim 1, characterized in that the detection of ambient brightness and IR remote control signals takes place through the web formed from plastic, which interacts with the relevant light channels for this purpose.
3. The passive infrared motion detector as claimed in claim 1 or 2, characterized in that the rectangular lens arrangement is formed from two opposing multilens parts in the form of truncated cones and/or spherical caps, which each have two lenses having multiple lens segments, and a recess is provided between the multilens parts, which accommodates the web of the cover part.
4. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the lens arrangement has the form of a 1/4 spherical cap having 12 lens segments.
5. The passive infrared motion detector as claimed in any one of claims 1 to 3, characterized in that the lens arrangement has the form of a 1/4 spherical cap having a 1/4 truncated cone having 18 lens segments.
6. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the cover part is fastened by means of a catch connection on the base part.
7. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that multiple ribs are arranged on the base part to hold the cover part in the base part.
8. The passive infrared motion detector as claimed in claim 7, having four holding ribs.
9. The passive infrared motion detector as claimed in claim 7 or claim 8, characterized in that the cover part has holding tabs, in which the holding ribs engage .
10. The passive infrared motion detector as claimed in any one of claims 6 to 8, characterized in that the cover part has centering ribs for exact positioning in relation to the base part, which engage in a corresponding centering recess of the base part.
11. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the active surfaces of the mirror arrangement and the respective associated passive IR sensors are arranged in relation to one another so that the active surfaces of the mirror arrangement supply mirror images of the associated IR sensors.
12. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the mirror arrangement has support surfaces, which support the lens arrangement on the rear and stabilize the lens arrangement.
13. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the mirror arrangement forms a receptacle device for a programming plunger and the light channels and.
14. The passive infrared motion detector as claimed in claim 12, characterized in that an actuation of the programming plunger puts the motion detector into a programming mode .
15. The passive infrared motion detector as claimed in claim 12 or 13, characterized in that the programming plunger returns into its starting position after the actuation by way of preferably two provided spring arms .
16. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the length of the light channel for the IR receiver is shorter than the length of the light channel for the brightness sensor, and the light channel for the brightness sensor and optionally also for the IR sensor is formed so that this light channel completely encloses the brightness sensor and prevents the entrance of scattered light through the lens arrangement to the brightness sensor.
17. The passive infrared motion detector as claimed in claim 15, characterized in that the length of the light channel for the brightness sensor is extendable accordingly by a cap.
18. The passive infrared motion detector as claimed in any one of the preceding claims, characterized in that the base part is insertable by means of mounting springs into a recess or false ceiling opening or into a surface box, which is fastened on a solid ceiling.
19. The passive infrared motion detector as claimed in claim 18, wherein the surface box is fastened by means of a bayonet fitting principle
20. The passive infrared motion detector as claimed in any one of the preceding claims, wherein the light channels accommodate light guides.