Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J1/00—Photometry, e.g. photographic exposure meter
  • G01J1/02—Details
  • G01J1/04—Optical or mechanical part supplementary adjustable parts
  • G01J1/06—Restricting the angle of incident light
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J1/00—Photometry, e.g. photographic exposure meter
  • G01J1/02—Details
  • G01J1/04—Optical or mechanical part supplementary adjustable parts
  • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
  • G01J1/0448—Adjustable, e.g. focussing
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
  • G01J5/02—Constructional details
  • G01J5/07—Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
  • G01J5/02—Constructional details
  • G01J5/08—Optical arrangements
  • G01J5/0831—Masks; Aperture plates; Spatial light modulators
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
  • G01J5/02—Constructional details
  • G01J5/08—Optical arrangements
  • G01J5/084—Adjustable or slidable
  • G01J5/0843—Manually adjustable
• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B13/00—Burglar, theft or intruder alarms
  • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
  • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
  • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
  • G08B13/193—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using focusing means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
  • G01J1/00—Photometry, e.g. photographic exposure meter
  • G01J1/02—Details
  • G01J1/04—Optical or mechanical part supplementary adjustable parts
  • G01J1/06—Restricting the angle of incident light
  • G01J2001/063—Restricting the angle of incident light with selectable field of view
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/005—Diaphragms

Definitions

• the invention relates to a container housing for an IR detecting device.
• the invention relates in particular, though not exclusively, to a container housing for a detecting device, for example of the kind used in alarm systems, which can house a sensor (PIR) with infrared technology (IR) and possibly a sensor with microwave technology (MW).
• PIR sensor
• IR infrared technology
• MW sensor with microwave technology
• Detecting devices exploiting the light emission in the infrared (IR) field have long been known. These detectors are also referred to as pyroelectric or PIR (“passive infrared”) detectors.
• PIR detectors do not emit energy in any form, but they work exclusively by detecting the energy emitted by the objects and, for this reason, they are defined as passive. PIR detectors are mainly used in the field of environmental surveillance, for the activation of burglar alarms, or in the field of automated lighting and control systems for switching on and off lamps or other devices.
• PIR detectors are known to be installed electrically connected to a control unit capable of generating an alarm signal, for example through a siren, when at least one of the detectors associated with the control unit, revealed a movement.
• Detecting devices are known to be housed in a plastic housing with a transparent lens that defines the coverage area, or field of view of the device. Radiations coming from the surrounding environment and which do not reach the lens but affect, for example, the other parts of the housing, are generally not able to activate the IR sensor of the detecting device. Devices of this kind are therefore generally made to obtain the widest possible field of view. A wide field of view indeed facilitates the installation of the devices and reduces the cost of the systems, thanks to the lower number of devices needed to cover the entire volume to be monitored. On the other hand, in numerous installations, it is necessary to prevent one or more areas of the environment surrounding the device from being covered by the field of view of the sensor.
• installers are used to shield the lens of the device with homemade means, such as strips of adhesive tape, or with other material impervious to IR rays.
• This arrangement artificially reduces the field of view of the detecting device and allows the installation of detectors in particular environments, where there are areas to be left unmonitored, for example due to the presence of people in motion when the alarm system is in operation.
• adhesive strips detach easily, particularly in damp environments, and are therefore unsuitable for professional installations.
• adhesive strips are not able to guarantee the width of the window opening angle with the desired precision, either because of the material used, always different depending on the installer’s contingent availability, or because of the intrinsic imprecision of manual installation.
• US4960995 (A) describes a radiation detector sensitive to thermal radiation, comprising a housing having a window receiving the radiation and a set of optics, equipped with means for varying the width of the window.
• the window has a size adapted to the angle of coverage of the optics placed behind it.
• the window is associated with a frame for receiving and guiding at least one masking element consisting of a strip-shaped plastic film, which reduces the field of view of the sensor by reducing the infrared radiation passing through the housing of the device.
• the strip or film is slidably movable in a guide channel along the window.
• An object of the invention is therefore to provide a solution to the aforementioned problem, which does not have the disadvantages of the known solutions.
• Another object of the invention is to provide a container housing for an IR detecting device, provided with a field of view having precisely variable coverage.
• a not least object of the invention is to provide a housing of the aforementioned type, which can be made with industrial techniques and which therefore lends itself to a large- scale manufacturing.
• the container housing for an IR detecting device mainly comprises a pair of half-shells that can be firmly associated with each other in order to make a whole shell defining the container housing.
• first half- shell or rear half- shell or base half- shell
• a first chamber adapted to receive an electronic printed circuit board or the like, for controlling an IR detecting device.
• Printed circuit boards and IR detectors are known in the art and will, therefore, not be described further.
• an opening or window is provided defining the maximum width of the field of view for the IR detecting device accommodated in the housing.
• a cradle is firmly associated to the first and/or second half-shell, at least a second chamber adapted to receive an IR detecting device controlled by said printed circuit board being defined in said cradle.
• the cradle preferably comprises a pair of chambers separated by a transverse screen, a first one of said chambers being adapted to receive an IR detecting device and a second one of said chambers being adapted to receive a microwave detector.
• the window houses a transparent screen or lens, transparent to IR rays.
• the screen engages at least the surface of the opening or window and separates the IR detector received in the cradle from the environment outside the housing.
• the transparent screen is arranged in front of the chamber receiving the IR detector and separates said chamber from the outer environment.
• the housing further comprises a shutter assembly comprising, in turn, a supporting and guiding frame or chassis attached to the cradle, and a pair of movable screens or curtains or skirts, slidably supported by said supporting and guiding frame.
• the movable screens are adapted to move towards or away from each other, preferably along a curved path substantially coincident with a cylindrical surface parallel to the transparent screen, which, similarly, will correspond to a cylindrical surface portion.
• the movable screens are adapted to close at least partially the opening or window by means of a discrete step-by-step movement. Still according to the invention, the discrete steps of movement of the movable screens are determined by the mutual influence between abutment elements provided on the screens and in the guiding and supporting frame.
• each movable screen comprises a pair of mutually facing parallel walls, arranged on the inner surface of the movable screen and perpendicular to the surface of the transverse fixed screen associated with the cradle.
• the facing walls comprise at least one tooth capable of engaging corresponding abutment surfaces, preferably notched, provided on the supporting and guiding frame.
• the abutment surfaces are defined on a removable portion or cross-bar of said supporting and guiding frame.
• facing walls having a plurality of teeth capable of engaging at least one tooth provided on said frame portion.
• the teeth may further be provided on either or both of the facing walls of the movable screen.
• the facing walls are capable of an elastic movement relative to each other in order to be kept in contact with the corresponding abutment surfaces during movement of the movable screens of the shutter relative to the frame.
• the shutter frame preferably comprises a pair of opposite bases, each having corresponding grooves defining as many guiding grooves for the opposite ends of the movable screens.
• the guiding grooves are advantageously curved in order to determine a corresponding movement of the movable screens along a substantially cylindrical imaginary surface.
• the movable screens are adapted to assume at least a first configuration in which the window is completely open, and a second configuration in which the window is partially closed.
• the movement of the movable screens will preferably be independent, whereby only one or both of the movable screens can be moved.
• the body of the half-shells is preferably elongated with a substantially rectangular plan.
• the two half-shells can be coupled to each other by known means such as interlocking, screwing, welding, adhesive.
• the shell or housing obtained by coupling together the two half-shells accommodates therein the cradle and the shutter assembly and, advantageously, all the components of the IR detecting device, and possibly the components of a second MW detector.
• the first and second half-shells, the cradle, the lens or transparent screen and the shutter assembly are preferably made of plastic material, for example acrylonitrile- butadiene- styrene or ABS.
• Fig.1 is a partially exploded perspective top view of a housing according to a preferred embodiment according to the invention.
• Fig.2 is an exploded view of the housing of Fig.1 ;
• Fig.3 A is an exploded view of the shutter assembly of the housing of Fig.l;
• Fig.3B is an enlarged view of a first detail of Fig.3A;
• Fig.3C is an enlarged view of a second detail of Fig.3A;
• Fig.4 is a rear view of the shutter assembly mounted in the second half-shell of the housing of Fig. l;
• Figs. 5 A to 5C show respective configurations of the movable screens in the housing of
• Figs. 6A to 6D schematically show respective positions of the two movable screens. Description of a Preferred Embodiment
• the container housing for an IR detecting device has been indicated as a whole by reference numeral 11.
• the housing 11 mainly comprises a pair of half-shells 13,15.
• a first half-shell 13, or rear half-shell there is defined a first chamber 17 adapted to receive a printed circuit board 19 for controlling an IR detecting device accommodated in the housing 11.
• a second half-shell 15 there is defined an opening or window 21 defining the maximum width of the field of view for the IR detecting device (not shown) accommodated in the housing 11.
• a cradle 23 is firmly associated, by interlocking in the shown embodiment, with the first half-shell 13, a pair of chambers 25,27 separated by a possibly removable transverse screen 29 being defined in said cradle.
• a first one 25 of the chambers of the cradle 23 is arranged to accommodate an IR detecting device controlled by said printed circuit board 19.
• a second one 27 of said chambers is arranged to accommodate a microwave detector.
• An IR transparent screen or lens 31 is housed in the window 21.
• the lens 31 engages at least the surface of the opening or window 21 and separates the IR detector accommodated in the cradle 23 from the environment outside the housing 11, thus protecting the housing from dust.
• the housing further comprises a shutter assembly 33.
• the shutter assembly 33 comprises a supporting and guiding frame or chassis 35 attached by interlocking to the cradle 23, and a pair of movable screens or curtains 37,39, slidably supported by said supporting and guiding frame 35.
• the movable screens 37,39 are adapted to close, like a pair of curtains, at least partially the opening or window 21 by means of a discrete step-by-step movement. Still according to the invention, and as will become more apparent from the ensuing detailed description, the discrete steps of the movement of the movable screens 37,39 is determined by the mutual influence between corresponding abutment surfaces 41 provided in the movable screens 37,39 and a corresponding abutment surface 43 provided in the supporting and guiding frame 35.
• each movable screen 37,39 comprises a pair of mutually facing parallel walls 45,47, arranged on the inner surface 49, perpendicular to the surface of the transverse screen 29 associated with the cradle 23, of each movable screen 37,39.
• Said facing walls 45,47 comprise opposed inner teeth 49 adapted to engage the abutment surfaces 43 provided on a transverse connecting portion or cross-bar 35a of the frame 35.
• said cross-bar 35a is separable from the frame 35 and is attached to the frame 35 by interlocking.
• Said abutment surfaces 43 may advantageously comprise at least one tooth or more preferably a plurality of teeth capable of engaging the teeth 49 provided on the inner sides adjacent to the walls 45,47.
• the facing walls 45,47 are provided each with a plurality of teeth 49 adapted to engage the abutment surfaces 43 arranged on the transverse screen 29.
• the facing walls 45,47 are slightly elastic and are capable of an elastic movement relative to each other in order to be kept in contact with the corresponding abutment surfaces 43 during movement of the movable screens 37,39 of the shutter assembly 33 relative to the removable cross-bar 35a.
• the frame 35 of the shutter assembly 33 preferably comprises a pair of opposite bases 51,53, each having corresponding grooves 55 defining as many guiding grooves for the opposite ends 57,59 of the movable screens 37,39.
• the guiding grooves 55 are advantageously curved in order to determine a corresponding movement of the movable screens 37,39.
• each movable screen 37,39 is provided with a radial protrusion or handle 61 in order to easily enable sliding of the movable screen 37,39 within the shutter assembly 33 by means of a hand finger.
• the handles 61 are advantageously accessible from the rear relative to the shutter assembly 33, when the housing 11 is open and the two half-shells 13,15 are separated.
• the opening of the window 21 can be determined upon installation, thus reducing the risk of tampering.
• the movable screens 37,39 are adapted to assume at least a first configuration in which the window 21 is completely open (Fig. 1), and a second configuration in which the window 21 is partially closed (Figg.5A,5B,5C).
• the movement of the movable screens 37,39 will preferably be independent, whereby only one or both of the movable screens 37,39 can be moved.
• FIG.5A shows a first configuration in which the window 21 is partially closed, the movable screen 37 located on the left in the figure completely closing the corresponding left portion of the window 21, and the screen 39 located on the right in the figure being completely open and hidden within the shutter assembly 33.
• the window 21 is transparent to IR rays only in the right-hand half indicated by reference numeral 2 la.
• Fig. 5B shows a second configuration in which the window 21 is partially closed, the screens 37,39 being both partially open towards the center of the window 21.
• Fig.5C shows a third configuration in which the window 21 is partially closed, the movable screen 37, located on the left in the figure, being completely open and hidden within the shutter assembly, and the screen 39, located on the right in the figure, completely closing the corresponding right-hand portion of the window 21.
• the window 21 is transparent to IR rays only in the left half indicated by reference numeral 2lc.
• each movable screen 37,39 is advantageously larger than the longitudinal extension of the window 21, whereby the entire length of the window is obscured by the screen 37,39 when this is moved towards the window 21.
• the transverse width of each movable screen 37,39 is preferably chosen so that the sum of the transverse widths of the two movable screens is smaller than the width or angular extension of the window 21, whereby the window 21 is always at least partially open, irrespective of the position taken by the two movable screens 37,39.
• the transverse width of each movable screen is approximately a quarter of the extension of the window 21.
• the window 21 has a width such to ensure a coverage angle of about 180° for the sensor accommodated in the chamber 25 and each movable screen 37,39 has a transverse development such to obscure a portion of approximately 30° of the window 21.
• FIGs. 6A to 6D these schematically show respective positions of the two movable screens 37,39.
• both movable screens 37,39 are completely withdrawn within the shutter assembly 33, whereby the whole lens 31 is penetrated through by the radiation coming from the outer environment.
• the IR sensor accommodated in the housing has a coverage of about 180°.
• the right-hand screen 37 is brought against the left-hand screen 39, which is entirely within the shutter assembly 33.
• the IR sensor accommodated in the housing has a coverage of about 57° on the right.
• both screens 37,39 are brought towards the center of the 21 so as to cover the corresponding right-hand and left-hand portions of the window 21.
• the IR sensor accommodated in the housing has a coverage of about 60° at its center.
• the left- hand screen 39 is brought against the right-hand screen 37, which is entirely within the shutter assembly 33.
• the IR sensor accommodated in the housing has a coverage of about 57° on the left.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Burglar Alarm Systems (AREA)
• Fire-Detection Mechanisms (AREA)
• Geophysics And Detection Of Objects (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=62530420

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (7)

• 2018
  • 2018-03-15 IT IT102018000003637A patent/IT201800003637A1/it unknown
• 2019
  • 2019-03-15 WO PCT/IB2019/052109 patent/WO2019175841A1/en not_active Ceased
  • 2019-03-15 EP EP19721028.9A patent/EP3766052A1/de active Pending

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