JP5584598B2 - Lighting fixture with Doppler sensor - Google Patents

Description

  The present invention relates to a lighting fixture with a Doppler sensor.

  2. Description of the Related Art Conventionally, there has been provided a luminaire with a Doppler sensor that detects a human body with a Doppler sensor and switches the light source on and off according to the detection of the human body (see, for example, Patent Document 1). In this type of luminaire, useless power consumption due to the user forgetting to turn off the light source can be suppressed as compared with the case where the light source is turned on / off manually.

  The Doppler sensor described above transmits (irradiates) a radio wave (transmission wave) such as a millimeter wave to a detection range, receives a radio wave (reflected wave) reflected in the detection range, and obtains an electric wave obtained by the reception. The signal is mixed (multiplied) with an electric signal having the same frequency as the transmission wave, and a Doppler signal is obtained by extracting a frequency band component corresponding to the moving speed of the human body from the obtained electric signal. By comparing the amplitude of the Doppler signal with a predetermined determination threshold, it is possible to determine the presence or absence of a human body within the detection range.

  Other sensors that detect the human body include, for example, a heat ray sensor (so-called PIR sensor) that detects heat rays emitted from the human body. Compared with a heat ray sensor, the Doppler sensor has an advantage that it is less susceptible to an environmental temperature change and an advantage that it can detect a human body at a relatively long distance. Due to the above advantages, the Doppler sensor is suitable for use in a place where the temperature changes more rapidly than in the case of a heat ray sensor, or for a usage pattern in which the Doppler sensor is attached to the ceiling in a building with a high ceiling.

JP 2009-168778 A

  However, when a fluorescent lamp that is lit with AC power is used as a light source, radiation noise generated by the fluorescent lamp may enter the Doppler sensor and cause malfunction.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture with a Doppler sensor in which the radiation noise which generate | occur | produced with the fluorescent lamp is hard to inject into a Doppler sensor.

  The present invention relates to a fluorescent lamp, a Doppler sensor that transmits and receives radio waves with respect to a predetermined detection range, an instrument main body that holds the fluorescent lamp, a fluorescent material, and the fluorescent lamp and the Doppler sensor. A cover fixed to the instrument body in a form that forms a space to be accommodated between the instrument body, and a distance between the instrument body and the cover interposed between the instrument body and the cover The support body is arranged between the Doppler sensor and the fluorescent lamp.

  In the above-described lighting fixture with a Doppler sensor, the support is preferably made of a material having at least one of conductivity and magnetism.

  In the lighting fixture with a Doppler sensor, the distance between the Doppler sensor and the cover is preferably an integral multiple of a half wavelength of the radio wave transmitted by the Doppler sensor.

  Furthermore, in the above-described lighting fixture with a Doppler sensor, it is desirable that the Doppler sensor is in close contact with the cover.

  Moreover, in said lighting fixture with a Doppler sensor, there exists a clearance gap between the said Doppler sensor and the said cover, and the said support body may be made into the dimension shape which does not enter into the said detection range.

  Furthermore, in the above-described lighting fixture with a Doppler sensor, the support may be connected to a central portion of the fixture main body.

  In the above-described lighting fixture with a Doppler sensor, the Doppler sensor may be fixed to the support.

  Furthermore, in the lighting apparatus with a Doppler sensor described above, a light shielding body made of a material that does not have translucency may be attached to the cover.

  Further, it is desirable that the light shield covers the support and the Doppler sensor as viewed from the direction in which the detection range is formed.

  According to the present invention, since the radiation noise generated in the fluorescent lamp is shielded by the support, the incidence of the radiation noise from the fluorescent lamp to the Doppler sensor can be suppressed.

It is sectional drawing in the AA cross section of FIG.2 (b) which shows embodiment. (A) and (b) show the same as above, (a) is a front view seen through the cover, and (b) is a bottom view. It is sectional drawing which shows the example of a change same as the above. It is a front view which shows the principal part of another example of a change same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In this embodiment, as shown in FIGS. 1 and 2, a straight tube type fluorescent lamp 1 having a cylindrical light-emitting portion, a Doppler sensor 2, a fluorescent lamp 1, and a Doppler sensor 2 are respectively held on the wall surface. An instrument body 3 fixed to a construction surface (not shown) such as a cover, and a cover 4 that sandwiches the fluorescent lamp 1 and the Doppler sensor 2 between the instrument body 3. Hereinafter, the vertical and horizontal directions are based on FIG. 2A, and the vertical direction in FIG. That is, the direction in which the cover 4 is positioned with respect to the fluorescent lamp 1 is referred to as the front, and the direction in which the instrument body 3 is positioned with respect to the fluorescent lamp 1 is referred to as the rear. Note that the above directions are defined for convenience of explanation only, and do not necessarily match the directions in the actual use state.

  The fluorescent lamp 1 is specifically a hot cathode type discharge lamp that is turned on with alternating current power. Since such a fluorescent lamp 1 is well known, detailed illustration and description thereof will be omitted.

  In the Doppler sensor 2, the surface from which the radio wave is emitted and incident is directed forward, and the detection range 20 is, for example, a truncated cone shape having the Doppler sensor 2 as a vertex and penetrating the cover 4. Since the Doppler sensor 2 can also be realized by a well-known technique, detailed illustration and description thereof will be omitted.

  The instrument main body 3 has an elongated rectangular parallelepiped shape, and holds a lighting device (not shown) that lights the fluorescent lamp 1 and a socket 31 that is electrically connected to the lighting device. As the lighting device, for example, a known copper iron ballast or electronic ballast can be used. The lighting device determines the presence or absence of a human body within the detection range based on the output of the Doppler sensor 2, and turns on the fluorescent lamp 1 when it is determined that a human body exists within the detection range while the fluorescent lamp 1 is extinguished. When the duration of the state in which it is determined that no human body exists within the detection range while the lamp 1 is lit reaches a predetermined control delay time, the fluorescent lamp 1 is turned off. The sockets 31 correspond to the bases (not shown) provided at both ends in the axial direction of the light emitting part of the fluorescent lamp 1 in a one-to-one correspondence, one at each end in the longitudinal direction of the instrument body 3, two in total. It is hold | maintained and it couple | bonds with each one nozzle | cap | die detachably. That is, when the socket 31 is coupled to each base, electrical connection between the fluorescent lamp 1 and the lighting device is achieved via the socket 31, and in this state, the longitudinal direction of the fixture body 3 and the light emitting portion of the fluorescent lamp 1 are achieved. The axial directions of the two coincide with each other in the left-right direction. Since the lighting device and the socket 31 as described above can be realized by a well-known technique, detailed illustration and description are omitted.

  The cover 4 is made of a material having translucency such as glass, for example, and covers the fluorescent lamp 1 when viewed from the front, which is the direction illuminated by the fluorescent lamp 2. The purpose of providing the cover 4 includes, for example, protection of the fluorescent lamp 1 and improvement of appearance by diffusing the light of the fluorescent lamp 1.

  The cover 4 is, for example, an elongated rectangular flat plate, and the longitudinal direction of the cover 4 coincides with the longitudinal direction of the instrument body 3, and one surface in the thickness direction faces the fluorescent lamp 1 and the Doppler sensor 2. It is connected to the instrument body 3 with a gap in between. Specifically, support walls 32 protruding forward from the instrument body 3 are fixed to both ends in the longitudinal direction of the instrument body 3, and the cover 4 has both ends in the longitudinal direction at the front end portions of the support walls 32. It is fixed to. As means for fixing the support wall 32 to the instrument body 3 and the cover 4, known means such as screwing and fitting can be used as appropriate.

  Further, a support 5 that secures a distance between the instrument body 3 and the cover 4 is interposed between the longitudinal center portions of the instrument body 3 and the cover 4 as shown in FIG. The support 5 is formed by bending a metal plate, for example, and includes a fixture side fixing portion 51 fixed to the central portion of the front surface of the fixture main body 3 and a cover fixed to the central portion of the rear surface of the cover 4. It has the side fixing | fixed part 52 and the connection part 53 interposed between the upper end of the instrument side fixing | fixed part 51, and the upper end of the cover side fixing | fixed part 52. FIG. The instrument side fixing part 51 and the cover side fixing part 52 are each directed in the thickness direction in the front-rear direction, the connecting part 53 is directed in the thickness direction in the up and down direction, and the support body 5 is generally U-shaped. Yes. As means for fixing the instrument side fixing part 51 to the instrument body 3 and means for fixing the cover side fixing part 52 to the cover 4, for example, screwing can be used. The fluorescent lamp 1 is positioned below the connecting portion 53 and is sandwiched between the instrument side fixing portion 51 and the cover side fixing portion 52 in the front-rear direction (left-right direction in FIG. 1).

  The present embodiment is characterized in that the Doppler sensor 2 is arranged on the upper side of the connecting portion 53 of the support body 5, that is, on the opposite side of the fluorescent lamp 1 with respect to the support body 5. The Doppler sensor 2 is fixed to the upper surface of the connecting portion 53 of the support 5 by appropriate means such as screwing. The Doppler sensor 2 may be fixed to the instrument main body 3 on the upper side of the support body 5 away from the support body 5.

  According to the above configuration, since the radiation noise generated in the fluorescent lamp 1 is shielded by the support 5, the incidence of radiation noise from the fluorescent lamp 1 to the Doppler sensor 2 can be suppressed. For this effect, the support 5 is desirably made of a material (for example, metal) having at least one of conductivity and magnetism so that radiation noise (radio waves) can be easily blocked.

  Here, in the example of FIG. 1, since the Doppler sensor 2 is in close contact with the cover 4 and the detection range 20 is directed to the cover 4, radio waves transmitted and received by the Doppler sensor 2 are shielded by the support 5. There is no end. On the other hand, for example, as shown in FIG. 3, when a gap is provided between the Doppler sensor 2 and the cover 4, it is desirable that the support 5 has a shape that avoids the detection range 20 of the Doppler sensor 2. In the example of FIG. 3, the front end of the connecting portion 53 is inclined downward toward the front (right side in FIG. 1) to prevent the front end of the support 5 from entering the detection range 20. . Further, when a gap is provided between the Doppler sensor 2 and the cover 4 as shown in FIG. 3, in order to suppress attenuation when radio waves transmitted by the Doppler sensor 2 pass through the cover 4, the Doppler sensor 2 and the cover 4. Is preferably a natural number (that is, a positive integer) times a half wavelength of the radio wave transmitted by the Doppler sensor 2. For example, when the frequency of the radio wave transmitted by the Doppler sensor 2 is 24.15 GHz (wavelength 12.4 mm), the distance between the Doppler sensor 2 and the cover 4 is, for example, 6.2 mm.

  Further, as shown in FIG. 4, a sheet-like light shielding body 6 made of a material having no translucency and covering the Doppler sensor 2 and the support body 5 when viewed from the front (that is, the direction in which the detection range 20 is formed). May be attached to the cover 4. As the light shielding body 6, for example, an acrylic resin film having a thickness of several hundred μm can be used. If the light shielding body 6 as described above is provided, the appearance can be improved.

DESCRIPTION OF SYMBOLS 1 Fluorescent lamp 2 Doppler sensor 3 Instrument body 4 Cover 5 Support body 6 Shading body 20 Detection range

Claims (9)

With fluorescent lights,
A Doppler sensor that transmits and receives radio waves for a predetermined detection range;
An instrument body for holding the fluorescent lamp;
A cover made of a light-transmitting material and fixed to the instrument body in a form that forms a space between the instrument body and the fluorescent lamp and the Doppler sensor;
A support body that is interposed between the instrument body and the cover and secures a distance between the instrument body and the cover;
The said fixture is arrange | positioned between the said Doppler sensor and the said fluorescent lamp, The lighting fixture with a Doppler sensor characterized by the above-mentioned.   The lighting device with a Doppler sensor according to claim 1, wherein the support is made of a material having at least one of conductivity and magnetism.   The lighting apparatus with a Doppler sensor according to claim 1 or 2, wherein a distance between the Doppler sensor and the cover is an integral multiple of a half wavelength of a radio wave transmitted by the Doppler sensor.   The lighting apparatus with a Doppler sensor according to claim 3, wherein the Doppler sensor is in close contact with the cover.   The gap between the Doppler sensor and the cover is provided, and the support is dimensioned so as not to enter the detection range. The lighting fixture with a Doppler sensor as described in 2.   The lighting device with a Doppler sensor according to claim 1, wherein the support is connected to a central portion of the device main body.   The said Doppler sensor is being fixed with respect to the said support body, The lighting fixture with a Doppler sensor of any one of Claims 1-6 characterized by the above-mentioned.   The light fixture with a Doppler sensor according to claim 1, wherein a light shielding body made of a material that does not have translucency is attached to the cover.   The lighting apparatus with a Doppler sensor according to claim 8, wherein the light shielding body covers the support and the Doppler sensor as viewed from a direction in which the detection range is formed.

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