DE202012011954U1 - Device for escape route marking - Google Patents

Abstract

Device for escape route marking by laser projection of safety characteristics comprising - a housing (7) with a light exit opening (15), - a laser module (9) for generating a laser beam, and - an optical component for shaping the laser beam and generating a projection (3) through the Light exit opening (15), characterized in that the optical component is designed as a diffractive optical element (12).

Description

The invention relates to a device for escape route marking by laser projection of safety markings.

In order to ensure quick orientation in emergencies, the legal requirement in many countries to mark the course of escape routes by means of standardized pictograms or symbols. Usually, this marking takes the form of luminescent, illuminating or backlit safety signs which are mounted overhead (> 2 meters) in the wall, ceiling or door area.

In certain applications, this type of escape route orientation has decided disadvantages such. As the poor visibility in smoke or the limited installation options for high halls. But also in terms of visibility, there are test series which prove that an escape route marking on the ground or near the ground, depending on the environmental situation is perceived much faster than an escape route marking in the ceiling area.

Consequently, there are already a number of systems which are used for escape route marking on the ground or near the ground. Depending on the system, however, these escape route markings have distinct disadvantages.

So z. B. luminescent adhesive films or paints under heavy use (eg forklift traffic) only limited durability or visibility is limited by pollution. The installation of actively illuminated systems in the ground is again very complex and costly and only associated with structural interventions.

Also, devices for escape route marking are known in which the escape route marking is done by laser projection of safety mark. Such devices include a housing having a light exit opening, a laser module or a comparable light source, and an optical mask for generating a projection through the light exit opening onto the floor or the wall.

However, such devices have the disadvantage that the mask blocks off a portion of the generated light and thus the device is not efficient enough, especially during battery operation.

The invention is therefore based on the object to represent the escape route marking on the floor so that the above-mentioned disadvantages do not come to fruition.

This is inventively achieved in that the optical component, which is used for shaping and generating the projection, is designed as a diffractive optical element.

The diffractive optical element can be designed to produce a first projection and a second projection, wherein a surface mirror can be arranged such that the second projection is emitted at an angle of preferably approximately 90 ° to the first projection through a second light exit opening.

According to the invention, an accumulator integrated in the device can be provided which ensures operation in the event of mains voltage failure.

Furthermore, a laser module is provided with a heat sink, wherein the heat sink is connected by a thermally conductive foam with a circuit board and / or the housing of the device.

The heat sink may be connected to the printed circuit board by at least two spaced apart and by the foam acted upon by mechanical pressure screws, by tightening and loosening the screws, the position and angle of the laser module relative to the circuit board and / or the housing of the device is variable.

Furthermore, it can be provided that at least two diffractive optical elements are provided, which can be exchanged by an electromechanical drive, preferably a servo drive.

The laser module may be oriented such that upon operation of the device and destruction or removal of the diffractive optical element, the primary laser beam of the laser module does not exit the housing. This can be achieved by making the exit opening from the housing small enough that the primary laser beam just can not pass through the exit opening when the diffractive optical element is removed.

The device may further include control electronics that places the device in a sleep mode when the power is off or when a button is pressed.

The invention further comprises an escape route orientation light with a device according to the invention for escape route marking. The escape route marking device can be integrated in the housing of the escape route orientation light and use its control electronics and / or supply electronics for control and / or supply.

Further features of the invention will become apparent from the claims, the drawings and the description.

The device according to the invention will now be explained with reference to an embodiment. Show it

1 a door with an embodiment of a device according to the invention;

2 : An embodiment of a device according to the invention in sectional view;

3 : Variants of security tags to be projected.

1 shows an inventive device 1 for escape route marking by laser projection of safety signs in the form of a projected symbol 2 on the ground 4 , The assembly of the device 1 can on a wall 6 or the ceiling or on appropriate columns and carriers. Illustrated is the mounting on the wall 6 above a doorway 5 which also serves as an emergency exit. Usually it will be above the door opening 5 already have a conventional escape route orientation light or escape route orientation sign and the device 1 is mounted next to or below this luminaire or shield. The assembly of the device 1 takes place by a ball head holder which a flexible alignment of the laser beam 3 guaranteed. The projection size of the icon 2 depends on the distance between the device 1 and the projection plane (the ground 4 ).

Optional is also the installation of the device 1 or its components without housing 7 directly into the housing of an escape route orientation light possible. The escape route orientation light contains in this case a corresponding laser exit opening via which the respective symbol 2 is projected. Parts of the electronic components and control or the accumulator can be omitted if necessary.

2 shows an embodiment of a device according to the invention 1 in section. The device 1 includes a housing 7 and a laser module 9 , At the laser module 9 It is a semiconductor laser which is selected depending on the desired color. The diffractive optical element 12 will be right in front of the laser module 9 mounted in a fixed or rotatable holder and ensures the appropriate shaping of the laser beam.

Due to the system, the diffractive optical element forms 12 the laser beam so that one to the optical axis 18 of the emitted laser beam symmetrical double projection (projections 3 . 17 ) is produced.

In a preferred design, this double projection ( 3 . 17 ) exploited once on the front side via a first outlet opening 15 to be radiated (first projection 3 ) and again through a surface mirror 14 deflected at a longitudinal outlet opening 16 is emitted (second projection 17 ).

The through the diffractive optical element ( 12 ) resulting double projection ( 17 ) is represented by a surface mirror ( 14 ) and at the longitudinal side of the housing via an exit window ( 16 ). An optional electrically rotatable holder or servo-driven removable holder of the diffractive optical element ( 12 ) allows a rotation or change of the symbol to be projected ( 2 ) and can be used with appropriate control for dynamic escape route guidance. In addition to the use of the escape route marking can with the device ( 1 ) depending on the diffractive optical element used ( 12 ) or laser module ( 9 ) different symbols in different colors are projected.

The laser module 9 is through a heat sink 8th which in turn held by mounting screws 19 with the circuit board 11 connected is. The connection is not rigid, but it is located between the circuit board 11 and the heat sink 8th a thermally conductive foam 10 which on the one hand for heat dissipation from the heat sink 8th to the cooling surfaces of the circuit board 11 serves and on the other hand in connection with the mounting screws 19 an exact alignment of the optical axis 18 of the laser module 9 allowed.

The heat sink can vary depending on the laser module used 9 be supplemented by a Peltier element or a fan, which supports the heat dissipation temperature controlled.

The shape of the case 7 with the housing outlet openings 15 and 16 as well as the orientation of the laser module 9 is done so that even with no existing diffractive optical element 12 the laser beam can not escape unhindered from the housing. This is achieved by the laser module and the housing are coordinated so that the optical axis 18 not through the opening 15 occurs.

The distance between the diffractive optical element 12 and the housing outlet openings 15 and 16 depends on the shape of the symbol to be projected ( 2 . 20 . 21 . 22 ) and the optical power of the laser module 9 , The reason is that right at the outlet openings 15 and 16 a maximum radiation power may not be exceeded so that the device meets the laser safety regulations. Due to this requirement, the housing size 7 essentially from the optical power of the laser module 9 and the shape of the symbol to be projected 2 dependent.

The device 1 has an accumulator 13 which ensures temporary operation even if the mains supply fails. Through a switch which is accessible from the outside, the device 1 between continuous operation (projection even if mains power supply is available) or standby mode (projection only in case of mains supply failure). The device 1 also has a button with which the device can be put in a sleep mode with switched off mains power supply. This sleep mode is automatically terminated by an electronic circuit as soon as the mains power supply is restored. Sleep mode deactivates laser projection 3 if the device z. B. is transported. With another button, this sleep mode can be deactivated again.

Optionally, the device can 1 with a rotatable holder of the diffractive optical element 12 which allows the symbol to be projected 2 along the optical axis 18 to turn manually. Optionally, the device can 1 with an electrically rotatable holder of the diffractive optical element 12 which allows the symbol to be projected 2 along the optical axis 18 to turn electromechanically. In conjunction with a corresponding control can thus be achieved a dynamic escape route guidance.

Optionally, the device can 1 be equipped with a servo drive which the diffractive optical element 12 electromechanically changes, whereby display directions and symbols can be changed arbitrarily. In conjunction with the appropriate control can be achieved hereby a dynamic escape route guidance.

The device 1 can be equipped with different symbols which exemplifies in 3 with the reference numerals 20 . 21 and 22 are shown. Also just the projection of an arrow 21 without frame is with the device 1 possible.

However, there is also the possibility of the diffractive optical element 12 according to the customer's wishes and z. B. to use for the projection of advertising logos. The color of the symbol or logo can be selected by choosing the appropriate laser module 9 be amended accordingly.

LIST OF REFERENCE NUMBERS

1

Device for escape route marking

2

Projected icon

3

First projection

4

ground

5

doorway

6

wall

7

casing

8th

heatsink

9

laser module

10

Thermally conductive foam

11

circuit board

12

Diffractive optical element

13

accumulator

14

surface level

15

First outlet

16

Second exit opening

17

Second projection

18

Optical axis

19

mounting screws

20

First safety mark

21

Second safety mark

22

Third security code

Claims (10)

Escape route identification device comprising laser projection of safety markings comprising - a housing ( 7 ) with a light exit opening ( 15 ), - a laser module ( 9 ) for generating a laser beam, and - an optical component for shaping the laser beam and generating a projection ( 3 ) through the light exit opening ( 15 ), characterized in that the optical component as a diffractive optical element ( 12 ) is executed. Apparatus according to claim 1, characterized in that the diffractive optical element ( 12 ) for generating a first projection ( 3 ) and a second projection ( 17 ), wherein a surface level ( 14 ) is arranged such that the second projection ( 17 ) at an angle of preferably about 90 ° to the first projection ( 3 ) through a second light exit opening ( 16 ) is radiated. Device according to one of the preceding claims, characterized in that an accumulator integrated in the device ( 13 ) is provided, which ensures operation in case of failure of the mains voltage. Device according to one of the preceding claims, characterized in that a laser module ( 9 ) with a heat sink ( 8th ) is provided, wherein the heat sink ( 8th ) by a heat-conducting Foam ( 10 ) with a printed circuit board ( 11 ) and / or the housing of the device is connected. Apparatus according to claim 4, characterized in that the heat sink ( 8th ) with the printed circuit board ( 11 ) by at least two spaced apart and by the foam ( 10 ) with mechanical pressure applied screws ( 19 ), wherein by tightening and loosening the screws, the position and the angle of the laser module ( 9 ) relative to the printed circuit board ( 11 ) and / or the housing of the device is changeable. Device according to one of the preceding claims, characterized in that at least two diffractive optical elements ( 12 ) are provided, which are interchangeable by an electromechanical drive, preferably a servo drive. Device according to one of claims 4 to 6, characterized in that the laser module ( 9 ) is aligned such that when operating the device, the optical axis ( 18 ) of the laser module ( 9 ) does not exit the housing. Device according to one of the preceding claims, characterized in that the device comprises an electronic control unit which places the device in a sleep mode when the mains supply is switched off or when a pushbutton is actuated. Escape route orientation light comprising an escape route marking device ( 1 ) according to one of claims 1 to 9. Escape route orientation light according to claim 9, characterized in that the device for escape route marking ( 1 ) is integrated in the housing of the escape route orientation light and uses the control electronics and / or supply electronics for control and / or supply.

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