EP2939221A1

EP2939221A1 - Light-emitting device for detecting passage or smoke and method for manufacturing such a device

Info

Publication number: EP2939221A1
Application number: EP13827029.3A
Authority: EP
Inventors: Christophe Bonazzi; Andrew GUILMOUR
Original assignee: Finsecur SAS
Current assignee: Finsecur SAS
Priority date: 2012-12-28
Filing date: 2013-12-30
Publication date: 2015-11-04
Also published as: WO2014102519A1; US9599465B2; FR3000589A1; FR3000589B1; US20150362313A1

Abstract

The invention relates to a light-emitting device (10) for detecting passage or smoke in the emitted beam, which comprises: a source (110) of invisible radiation, a source (115) of visible laser radiation, a means (155, 160) for aligning the central axis of the visible radiation with an axis parallel to the central axis of the invisible radiation, and a switch (140) for turning off the visible laser source. In certain embodiments of the invention, the device comprises a housing containing both sources of radiation, the switch being controlled by the closing of the housing and controlling the turning off of the source of visible laser radiation when the housing is closed.

Description

LIGHT EMITTING DEVICE FOR PASSING OR SMOKE DETECTION AND METHOD FOR MANUFACTURING SUCH DEVICE

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a light emitting device for the detection of passage or smoke, a method of manufacturing such a device and a passage or smoke detection device comprising it. It applies, in particular, to the detection of fire and / or intrusion and / or the surveillance of premises or sites.

STATE OF THE ART

Fire detection is done in different ways, at least one of which is optical. In this case, a light signal is emitted into the room, preferably infrared for the detection of smoke, the light radiation emitted after passing through part of the room atmosphere is detected and the presence of smoke is detected when the amount of light received is less than a limit value. The greater the distance traveled by the light beam in the room, the faster the smoke detection. However, the orientation tolerances of the light emitting components are important and the insertion of these detectors into housings adds additional dispersion. It is thus difficult to correctly position the light sensor opposite the light emitter or, in the case where a single housing comprises the emitter and the sensor, to position a retro-reflector in the emitted light beam. As a result, either the distance traveled is reduced or the installation takes a long time.

The prevention of the risk of third party intrusion or fire in premises or sites is a strong constraint for the safety of the property and people present inside these sites and premises. The known detection systems use either cameras or light ray sensors emitted by light sources. The cameras and image processing required to detect the passage of an intruder are complex, expensive and unreliable because they are sensitive to the movements of shadows, such as trees set in motion by the wind or birds. In addition, the light rays to be used must be invisible to prevent an intruder from seeing them and thus bypass them, or in the case of fire detection be the least invasive possible. However, pointing an invisible ray on a target is very difficult, which increases the installation time of such systems. OBJECT OF THE INVENTION The present invention aims to remedy all or part of these disadvantages.

For this purpose, according to a first aspect, the present invention aims at a light emitting device for the detection of passage in the emitted beam, which comprises:

a source of visible laser radiation,

a means for aligning the central axis of the visible radiation on a reference axis parallel to the central axis of the invisible radiation and

- a switch to turn off the visible laser source.

Thanks to these arrangements, during the installation of a passage detection system, the light-emitting device is installed by switching on the visible laser radiation source. The aiming of the laser on a target, for example a light sensor or a retro-reflector, is thus easy since the operator sees the visible laser radiation.

In embodiments, the visible laser radiation source emits light of wavelength between 497 and 560 nm. These arrangements make the laser radiation particularly visible.

In embodiments, the device that is the subject of the present invention comprises means for controlling a cyclic ignition of the visible laser source downstream of the switch.

Thanks to these provisions, the visible laser beam is all the more visible since the eye of the operator sees the changes in brightness better than the constant lights. In addition, the power consumption of the device is reduced since, during installation, the visible laser radiation source is ignited only during part of the ignition cycle.

In embodiments, the device of the present invention comprises a housing containing the two radiation sources and a switch, the switch to turn off the visible laser source being controlled by the switch of the housing configured to control the activation of the laser source visible when opening the housing and controlling the extinction of the visible laser radiation source when the housing is closed.

Thanks to these provisions, during installation, the housing is opened and the radiation is tracked on the target by pointing means contained in the housing. On the other hand, when pointing is performed, the housing is closed, which has the effect of extinguishing the visible laser radiation source and protect the pointing means from any manipulation.

In embodiments, the visible laser radiation source has a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, and the alignment means comprises: an outer part having a cylindrical or conical inner bore of revolution, the axis of the bore being offset with respect to the reference axis by a first angle at least equal to half the predetermined angular tolerance and

an intermediate piece having a cylindrical or conical outer surface of revolution corresponding to a portion of the internal bore of the outer piece and a cylindrical or conical internal bore of revolution corresponding to a portion of the external surface of the visible laser radiation source; , the axis of the outer surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle.

Thanks to these arrangements, once the two sources of laser radiation implanted on a plane support, at the factory, their optical axes are made parallel by rotating the intermediate piece and the visible laser radiation source, which has the effect of varying continuously and regularly the orientation of the optical axis of the visible laser radiation source.

In embodiments, the invisible radiation source has a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, and the alignment means comprises:

an outer part having a cylindrical or conical inner bore of revolution, the axis of the bore being offset with respect to the reference axis by a first angle at least equal to half the predetermined angular tolerance and

an intermediate piece having a cylindrical or conical outer surface of revolution corresponding to a portion of the internal bore of the outer piece and a cylindrical or conical internal bore of revolution corresponding to a part of the external surface of the invisible radiation source, the axis of the outer surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle.

Thanks to these arrangements, once the two laser radiation sources implanted on a plane support, at the factory, their optical axes are made parallel by rotating the intermediate piece and the invisible radiation source, which has the effect of continuously varying and regularly the orientation of the optical axis of the visible laser radiation source.

In embodiments, the support of the visible laser radiation source comprises at least one outer part comprising a cylindrical recess and an inner part whose outer surface corresponds to the recess of the outer part provided with a recess. a cylindrical circular base corresponding to the external surface of the visible laser radiation source, the axes of the outer and inner cylindrical surfaces of the inner part forming, between them, an angle greater than a degree of angle and less than ten degrees of angle.

Thanks to these characteristics, by rotating the inner cylinder in the outer cylinder and the visible laser radiation source in the inner cylinder, it is possible to compensate, in a solid angle, any difference between the mechanical and optical axes of the visible radiation source. . It is thus possible to use visible radiation sources having high manufacturing tolerances and therefore a low cost price.

According to a second aspect, the present invention provides an alarm device comprising a light emitting device object of the present invention, a means for receiving light emitted by said light emitting device and a means for generating light. alarm configured to emit an alarm signal when the light receiving means receives a light intensity less than a predetermined limit value.

According to a second aspect, the present invention aims a smoke detection device comprising a light emitting device object of the present invention, a means for receiving the light emitted by said light emitting device and a means for generating a signal representative of the smoke detection configured to emit a smoke detection signal when the light receiving means receives a light intensity less than a predetermined limit value.

According to a third aspect, the present invention provides an intrusion detection device comprising a light emitting device object of the present invention, a means for receiving the light emitted by said light emitting device and a means of generating a signal indicative of an intrusion configured to transmit an intrusion detection signal when the light receiving means receives a light intensity less than a predetermined limit value.

According to a fourth aspect, the present invention provides a method of manufacturing a light emitting device object of the present invention, which comprises:

a step of implantation on a plane support of the invisible radiation source,

a step of implantation on the plane support of the source of visible laser radiation and

a step of parallel alignment of the optical axes of the laser radiation sources. In embodiments, during the parallel alignment step, the following are performed:

a step of rotation, in an outer part comprising a cylindrical recess, of an inner part whose outer surface corresponds to the recess of the outer part provided with a cylindrical recess with a circular base corresponding to the external surface of the source; of visible laser radiation, the axes of the outer and inner cylindrical surfaces of the inner part forming, between them, an angle greater than a degree of angle and less than ten degrees of angle and

a step of rotation of the laser radiation source visible in the internal part.

In embodiments, the visible laser radiation source having a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, during the parallel alignment step, is carried out:

a step of rotation of an intermediate part in an external part,

the outer part having a cylindrical or conical internal bore of revolution, the axis of the bore being offset with respect to the reference axis by a first angle at least equal to half the predetermined angular tolerance and

the intermediate piece having a cylindrical or conical external surface of revolution corresponding to a portion of the internal bore of the outer piece and a rotation of the source of visible laser radiation in the intermediate piece,

the intermediate piece having a cylindrical or conical internal bore of revolution corresponding to a part of the external surface of the visible laser radiation source, the axis of the external surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle. In embodiments, the invisible radiation source having a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, during the parallel alignment step, is carried out:

a step of rotation of an intermediate part in an external part,

the intermediate piece having a cylindrical or conical outer surface of revolution corresponding to a portion of the internal bore of the outer piece and

a rotation of the invisible radiation source in the intermediate piece, the intermediate piece having a cylindrical or conical inner bore of revolution corresponding to a portion of the outer surface of the invisible radiation source, the axis of the outer surface and the axis of the internal bore of the intermediate piece having them an angle equal to the first angle.

The advantages, aims and particular characteristics of these detection devices and this method being similar to those of the light emitting device object of the present invention, they are not recalled here.

Another problem that certain embodiments of the present invention solve is that of the alignment of an axis of a mechanical part parallel to a predetermined axis, when said axis of the mechanical part has an angular tolerance.

For example, the mechanical part is a light source whose optical axis, which has an angular tolerance with respect to the mechanical axis, must be aligned parallel to an optical axis.

To overcome this difficulty of parallel alignment, the present invention aims, according to a fifth aspect, an alignment device parallel to a reference axis of an axis of a part having a cylindrical outer surface or conical revolution and a predetermined angular tolerance, which comprises:

an intermediate piece having a cylindrical or conical external surface of revolution corresponding to a portion of the internal bore of the outer piece and a cylindrical or conical inner bore of revolution corresponding to a part of the outer surface of the piece whose axis must be aligned, the axis of the external surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle,

the part whose axis must be aligned sliding in rotation in the internal bore of the intermediate piece.

Note that the two surfaces "corresponding" means two surfaces identical to a close mechanical play that allows the rotation of one surface in another.

Thanks to these arrangements, by rotating the intermediate part in the outer part and a rotation of the part whose axis must be aligned in the intermediate piece, it is possible to compensate for any angle of the axis which must be aligned with the mechanical axis of the workpiece less than the angular tolerance. In embodiments, the first angle is at least equal to the sum of one-half of the predetermined angular tolerance and the angular tolerance of mechanical positioning of the axis of the outer part.

Thanks to these arrangements, even if the outer part has an offset axis, within the limit of the positioning tolerance, offset from its nominal position, alignment can be achieved.

BRIEF DESCRIPTION OF THE FIGURES

Other advantages, aims and features of the present invention will emerge from the description which follows, for an explanatory and non-limiting purpose, with reference to the appended drawings, in which:

FIG. 1 represents, in four sectional views, elements of a particular embodiment of the light emitting device object of the present invention,

FIG. 2 represents an implementation diagram of an alarm device that is the subject of the present invention,

FIG. 3 represents, in the form of a logic diagram, the steps implemented in a particular embodiment of the method that is the subject of the present invention,

FIGS. 4 to 6 show, respectively, two pieces of optical axis alignment means and a source of visible laser radiation, and

- Figures 7 to 9 show successive respective positions of the parts illustrated in Figures 4 to 6 and the visible laser radiation source.

DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION

It is noted that the figures are not to scale.

FIG. 1 shows a particular embodiment of a light emitting device 10 of the present invention, out of the box, from the front, at the top left, in section along the axis AA, at the bottom at left and in section along the BB axis, on the right and, for a case, on the bottom right.

This device 10 comprises:

a source 1 10 of invisible radiation,

a source 1 15 of visible laser radiation,

a means 155 and 160 for aligning the central axis of the visible radiation on a reference axis parallel to the central axis of the invisible radiation and

a switch 140 for turning off the visible laser source 1. In this device 10, a plane support 105 carries the invisible light source 1 10, the visible laser light source 1 15, a photoreceptor 120. Each of these photoelectronic components is surrounded by a cylinder 145 for protection against parasitic lights. The protective cylinders are formed of a black plastic mechanical part fixed on the plane support 105 by screws 125.

The photoreceptor 120 is surmounted by a chromatic filter 150 configured to pass a narrow band of wavelengths around the emission wavelength of the invisible laser light source 1 10.

The invisible light source 1 10 is, for example, an infrared diode emitting in the infrared wavelength domain. The visible laser light source 1 emits, preferably, a green light beam, color for which the human eye is particularly sensitive. It is recalled that the primary green is visible in a wavelength range of approximately 497-560 nm. The sensitivity of a dark-adapted human eye is greatest for a wavelength of about 507 nm, a bluish green, while a light-adapted eye is the most sensitive for a length of 60 minutes. wave of 550-555 nm is a yellowish green.

The photoreceptor 120 is, for example, a phototransistor. In variants, the invisible light source 1 10 is an infrared laser diode.

A switch 140 makes it possible to turn on the visible laser light source 1 15. A cyclic control means 135 is placed between the switch 140 and the invisible light source 1 15. When the housing of the device 10 is open and the switch 140 is closed, the visible laser light source 1 15 cyclically emits a visible light beam. For example, the cycle time is one second and the light emission duration is half a second.

A switch 130, controlled by the closure of the housing switches the light emission between the visible laser light source 1 15, when the housing is open and the invisible light source 1 10, when the housing is closed.

To make the light rays coming from the two light sources 1 10 and 1 15 parallel, the device 10 comprises means for adjusting the orientation of the optical axis of the light source 1 15. In the embodiment represented in FIG. Figure 1, the invisible light source 1 10 is a surface mounted component ("CMS"). Its orientation is therefore fixed relative to the plane support 105. On the other hand, the visible light source 1 15 is a low-cost component, in the form of a cylinder with a circular base. The means for parallel alignment of the optical axes of the radiation sources 1 10 and 1 15 comprises, in the embodiment shown in FIG. 1, forming a support for the visible radiation source 1 15:

an outer part 155 comprising a cylindrical recess and

an inner part 160 whose outer surface corresponds to the recess of the outer part provided with a cylindrical recess with a circular base corresponding to the external surface of the visible laser radiation source, the axes of the outer and inner cylindrical surfaces of the an inner part preferably forming, between them, an angle greater than a degree of angle and less than ten degrees of angle; preferably less than five degrees of angle.

The alignment means is described with reference to FIGS. 4 to 9.

Thus, by rotating the inner part 160 in the cylindrical recess of the outer part 155, on the one hand, and the visible laser radiation source 1 15 in the inner recess of the inner part 160, on the other hand, the optical axis of the visible laser radiation source 1 is oriented in any direction of a solid angle.

This compensates for the difference between the mechanical and optical axes of the visible radiation source 1 15. It is thus possible to use visible radiation sources having high manufacturing tolerances, for example three degrees of angle, and therefore a low cost price.

Each device 10 is coupled to a reflector, for example a retro-reflector, positioned at one end of an optical path corresponding to the optical axis of the invisible light source 1 10. The reflected light is partially captured by the photoreceptor 120. output signal of the photoreceptor 120 is processed by an electronic circuit (not shown but preferably coincides with the plane support 105) which compares it to a predetermined limit value. The limit value is either fixed or adaptive, that is to say slowly variable depending on the output signal of the photoreceptor 120. When the signal from the photoreceptor 120 corresponds to a reflected light intensity lower than a limit value, the electronic circuit triggers a signal representative of the passage of an object, a person or an animal in the optical path from the light source 1 10 to the reflecting surface.

At the bottom right of FIG. 1 is a casing lid 165, in section, having a transparent window 170 for the wavelengths perceived by the photoreceptor 120.

This housing 165 also comprises a support 175 configured to actuate the switch 130 when closing the housing on the plane support 105 so that the visible light source 1 15 can no longer emit light and the invisible light source 1 10 can emit light. Conversely, as soon as the housing 165 is open, the switch 130 is released and the visible light source 1 15 can emit light and the invisible light source 1 10 can no longer emit light. Of course, during the manufacture and adjustment phase of the device, the two light sources can emit simultaneously, under the control of a program dedicated to this step.

As seen in FIG. 2, to monitor a site by detecting intrusions, an alarm device 20 is installed comprising at least one light emitting device that is the subject of the present invention. In Figure 2, two light-emitting devices 205 and 210 are used. The light emitting device 205 emits, first, a visible light beam 215, which is reflected on a retro-reflector 225. The positioning of the device 205 and / or the catadiopter 225 is facilitated by the fact that the light emitted by the source 1 15 is visible and in that this emission of light is intermittent. Once the positions of the device 205 and the reflex reflector 225 are fixed, the housing of the device 205 is closed, which has the effect of extinguishing the source 1 15. During its operation, the device 205 emits an invisible ray 220, which also reflects on the reflex reflector 225.

In the same way, the device 210 emits successively a visible light beam 230 and an invisible light beam 235 in the direction of a retro-reflector 240. After comparison with a predetermined limit value, the signal coming from the photoreceptors 120 of the devices 205 and 210 are transmitted 245. The alarm control unit 245 follows the instructions of a program to trigger actions following the detection of passage in the light beams 220 and 235. For example, the central alarm 245 sends messages. calls and / or sounds an audible alarm by sounding a tone to a loudspeaker 250.

In embodiments, the device 20 is incorporated in a smoke or fire detection device, which also includes a means for generating a signal representative of the smoke detection configured to emit a smoke detection signal when the light receiving means receives a light intensity lower than a predetermined limit value.

In embodiments, the device 20 is incorporated in an intrusion detection device, which also includes means for generating a signal representative of an intrusion configured to transmit an intrusion detection signal when the light reception receives a light intensity less than a predetermined limit value. As seen in FIG. 3, the manufacture of a light emitting device which is the subject of the present invention comprises:

a step 300 of implantation on a plane support of the invisible radiation source 1 15 and of the visible laser radiation source 1 10 and

a step 305 to 315 for aligning the parallelism of the optical axes of the laser radiation sources 1 10 and 1 15.

During step 305, the invisible radiation source 1 10 is turned on and it is verified that the direction of the optical axis of the invisible radiation source 1 10 is perpendicular to the plane support 105. Otherwise, the orientation is changed. of the plane support 105 until the optical axis of the invisible radiation source 1 10 corresponds to a predetermined optical axis. For example, the radiation reflected on the photoreceptor 120 is measured for a first retro-reflector, placed close to the plane support 105, then, once the orientation has been set, to a second, further, retro-reflector, and so on.

Note that for some laser diodes, the optical axis is normalized as perpendicular to the plane of the surface-mounted circuit ("CMS") and step 305 is unnecessary.

During step 310, the source of visible laser radiation 1 15 is turned on and the parallelism of the optical axes of the radiation sources 1 10 and 1 15 is adjusted by carrying out:

a step of rotation of the laser radiation source visible in the internal part.

During step 315, the position of the visible laser radiation source 1 15 is fixed, for example by welding or gluing. During a step 320, the light-emitting device 10 is implanted on the site to be monitored without putting the housing cover on the plane support 105. During a step 325, the laser radiation source is turned on. visible 1 15.

During a step 330, the relative positioning of the device 10 and the reflex reflector is carried out, which must reflect its invisible radiation. For this purpose, either the device 10 is held in place and the reflex reflector is positioned at the location indicated by the visible laser radiation, or the reflex reflector is first fixed and then the orientation of the device 10 is shifted or changed. modification of the orientation of the device 10 is achieved by the use of adjustment screws configured to allow adjustment of the angle causing the alignment of the visible laser radiation source 1.

During a step 335, the housing of the device 10 is closed, positioning the cover. During a step 340, the closing of the housing of the device 10 causes the extinction of the visible laser radiation source 1 15.

During a step 345, the monitoring of the site is triggered. This monitoring is triggered by the alarm center 245. During a step 350, the invisible radiation source 1 10 is turned on. During a step 355, the passage of an object, a animal, a person or obscuration by smoke in the ray emitted by the invisible laser radiation source by processing the signal from the photoreceptor 120. During a step 360, if a passage is detected, the Central alarm triggers actions depending on the program that makes it work.

As illustrated in FIG. 4, the outer part 155 of the parallel alignment means of the optical axes of the radiation sources 1 10 and 1 15 has an internal bore 156 which is cylindrical or conical of revolution. In Figure 4, this bore 156 is a truncated cylinder of revolution.

The axis of the bore 156 is offset from the reference axis by a first angle at least half of the predetermined angular tolerance of the visible laser light source 1.

Preferably, the first angle is at least equal to the sum of the half of the predetermined angular tolerance and the angular tolerance of mechanical positioning of the axis of the outer part 155 and the angular tolerance of the mechanical positioning of the axis. the source of radiation 1 10 invisible.

As illustrated in FIG. 5, the intermediate piece 160 of the alignment means has:

a cylindrical or conical outer surface 162 of revolution corresponding to a part of the internal bore 156 of the outer part 155 and

a cylindrical or conical internal bore 161 of revolution (cylindrical in FIG. 5) corresponding to a part of the external surface 1 18 of the source 1 15 of visible laser radiation, the axis of the external surface 161 and the axis of the internal bore 162 of the intermediate piece 160 having, between them, an angle preferably equal to the first angle.

As illustrated in FIG. 6, the source 1 15 of visible laser radiation has a cylindrical or conical external surface 1 18 of revolution (cylindrical in FIG. predetermined angular tolerance between its mechanical axis 1 17 (the axis of revolution of the outer surface 1 18) and its optical axis 1 16, that is to say the axis along which the laser radiation propagates. Note that if the source 1 15 of visible laser radiation does not have a cylindrical or conical outer surface of revolution, the source 1 15 is secured to a part having these missing geometrical characteristics.

In order to align the optical axis of the radiation source 1 15 in parallel with the axis of the invisible radiation source 1 10, starting from the configuration illustrated in FIG. 7, during step 310, it is rotated simultaneously or successively :

the intermediate piece 160 in the outer piece 155, as illustrated in FIG. 8, and the visible laser light source 1 15 in the intermediate piece 160, as illustrated in FIG. 9.

It will be noted that the alignment means presented with reference to FIGS. 4 to 9 are alternatively applied to the source 1 10 of invisible radiation or to each of the two radiation sources 1 10 and 1 15.

In a more general manner, the characteristics of the alignment means illustrated in FIGS. 4 to 9 make it possible to obtain the alignment of an axis of a mechanical part parallel to a predetermined axis, when said axis of the mechanical part presents angular tolerance.

In the example above, the mechanical part is a light source whose optical axis, which has an angular tolerance with respect to the mechanical axis, must be aligned parallel to a reference optical axis, that is, ie the optical axis of the invisible radiation source.

In a more general way, to overcome the difficulty of parallel alignment of two axes, the present invention aims, in a fifth aspect, an alignment device parallel to a reference axis of an axis of a part having a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, which comprises:

an intermediate piece having a cylindrical or conical external surface of revolution corresponding to a portion of the internal bore of the outer piece and a cylindrical or conical inner bore of revolution corresponding to a part of the outer surface of the piece whose axis must be aligned, the axis of the external surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle, the part whose axis must be aligned sliding in rotation in the internal bore of the intermediate piece.

Thanks to these arrangements, by rotating the intermediate part in the outer part and a rotation of the part whose axis must be aligned in the intermediate piece, it is possible to compensate for any angle of the axis which must be aligned with the mechanical axis of the workpiece less than the angular tolerance.

In embodiments, the first angle is at least equal to the sum of one-half of the predetermined angular tolerance and the angular tolerance of mechanical positioning of the axis of the outer part.

Claims

1. Apparatus (10) for transmitting light or smoke in the transmitted beam, characterized in that it comprises:

a source (1 10) of invisible radiation,

a source (1 15) of visible laser radiation,

means (155, 160) for aligning the central axis of the visible radiation on a reference axis parallel to the central axis of the invisible radiation and

a switch (140) for switching off the visible laser source.

The light-emitting device (10) according to claim 1, wherein the source (1-15) of visible laser radiation emits light having a wavelength of between 497 and 560 nm.

3. Device (10) according to one of claims 1 or 2, which comprises means (135) for controlling a cyclic ignition of the source (1 15) of visible laser radiation downstream of the switch (140). .

4. Device (10) according to one of claims 1 to 3, which comprises a housing containing the two sources (1 10, 1 15) of radiation and the switch (140) configured to control the activation of the laser source visible when opening the housing and controlling the extinction of the visible laser radiation source when the housing is closed.

5. Device (10) according to one of claims 1 to 4, wherein the source (1 15) of visible laser radiation has a cylindrical outer surface or conical revolution and a predetermined angular tolerance, and the alignment means comprises :

an outer part (155) presenting a cylindrical or conical internal bore of revolution, the axis of the bore being offset with respect to the reference axis, by a first angle at least equal to half of the angular tolerance predetermined and

an intermediate piece (160) having a cylindrical or conical outer surface of revolution corresponding to a portion of the internal bore of the outer piece and a cylindrical or conical inner bore of revolution corresponding to a portion of the external surface of the source of visible laser radiation, the axis of the outer surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle.

6. Device (10) according to one of claims 1 to 4, wherein the invisible radiation source has a cylindrical outer surface or conical revolution and a predetermined angular tolerance, and the alignment means comprises: an outer part having a cylindrical or conical inner bore of revolution, the axis of the bore being offset with respect to the reference axis by a first angle at least equal to half the predetermined angular tolerance and

A smoke detection device comprising a light-emitting device (10) according to one of claims 1 to 6, means for receiving light emitted by said light-emitting device, and means for generating light. a signal representative of the smoke detection configured to emit a smoke detection signal when the light receiving means receives a light intensity less than a predetermined limit value.

An intrusion detection device comprising a light emitting device (10) according to one of claims 1 to 6, means for receiving light emitted from said light emitting device and generating means a signal representative of an intrusion configured to transmit an intrusion detection signal when the light receiving means receives a light intensity less than a predetermined limit value.

9. A method of manufacturing a light emitting device according to one of claims 1 to 8, characterized in that it comprises:

a step (300) of implantation on a plane support of the invisible radiation source,

a step (300) of implantation on the plane support of the source of visible laser radiation and

a step (305, 310) of parallel alignment of the optical axes of the laser radiation sources.

The method of claim 9, wherein during the parallel alignment step (305, 310), the following steps are performed:

a step of rotation, in an outer part comprising a cylindrical recess, of an inner part whose outer surface corresponds to the recess of the outer part provided with a cylindrical recess with a circular base corresponding to the external surface of the source; visible laser radiation, the axes of the outer and inner cylindrical surfaces of the inner part forming, between them, an angle greater than one degree of angle and less than ten degrees of angle and

a step of rotation of the laser radiation source visible in the internal part.

The method of claim 9, wherein, the source (1-15) of visible laser radiation having a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, in the step (305, 310) of parallel alignment, we perform:

a step of rotation of an intermediate part in an external part,

- the outer part (155) having a cylindrical internal bore or conical revolution, the axis of the bore being offset from the reference axis, a first angle at least equal to half of the angular tolerance predetermined and

the intermediate piece (160) having a cylindrical or conical external surface of revolution corresponding to a portion of the internal bore of the outer piece and

a rotation of the visible laser radiation source in the intermediate piece,

the intermediate piece having a cylindrical or conical internal bore of revolution corresponding to a part of the external surface of the visible laser radiation source, the axis of the external surface and the axis of the internal bore of the intermediate piece having between them an angle equal to the first angle.

The method of claim 9, wherein, the source (1 10) of invisible radiation having a cylindrical or conical outer surface of revolution and a predetermined angular tolerance, during the step (305, 310) of parallel alignment we carry out:

a step of rotation of an intermediate part in an external part,

a rotation of the invisible radiation source in the intermediate piece,

the intermediate piece having a cylindrical or conical inner bore of revolution corresponding to a portion of the outer surface of the invisible radiation source, the axis of the outer surface and the axis of the internal bore of the intermediate piece having them an angle equal to the first angle.