JP2012028272A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which is capable of enhancing visibility obtained by irradiation light.SOLUTION: The lighting device includes: a turn-on circuit unit 2 for turning on a light source unit 1 which applies light to a predetermined irradiation area S; a human detection sensor unit 3 for detecting the presence of a passerby H at least in the irradiation area S; and a color temperature control unit 4 which, when the presence of the passerby H is not detected by the human detection sensor 3, performs control so that the light applied from the light source unit 1 has a first color temperature and, when the presence of the passerby H is detected by the human detection sensor 3, performs control so that the light applied from the light source unit 1 has a second color temperature lower than the first color temperature.

Description

  The present invention relates to a lighting device that detects the presence of a person and switches lighting.

  In recent years, with the conclusion and effectuation of the “Kyoto Protocol”, there has been a demand for significant reductions in greenhouse gas emissions, and efforts have been made to reduce the power consumption of various electrical devices. For this reason, there is no exception to lighting devices used for street lights or road lighting fixtures, which are outdoor public lights provided for the safety of passersby, and further reduction in power consumption is required.

  As this type of lighting device 610, for example, as shown in FIG. 6, a light source unit 61 that irradiates light within a predetermined irradiation range, a lighting circuit unit 62 that supplies power for lighting the light source unit 61, The average horizontal illuminance in the irradiation range is set to the first illuminance when the presence of the person (passerby H) is detected by the human detection sensor unit 63, and the presence of the passerby H is detected by the human detection sensor unit 63. When it is not done, what is provided with the illumination intensity control part 64 which controls to 2nd illumination intensity which is lower than 1st illumination intensity and is 20%-50% of 1st illumination intensity is known (for example, patent documents) 1).

  As shown in FIG. 6A, the lighting device 610 has a light source unit 61 connected to a lighting circuit unit 62 and a lighting circuit unit 62 connected to an illuminance control unit 64. Further, the illuminance control unit 64 of the lighting device 610 controls the lighting circuit unit 62 according to the output of the illuminance sensor 65 that detects the average horizontal illuminance of the irradiation range irradiated from the human detection sensor unit 63 and the light source unit 61. ing. As illustrated in FIG. 6B, the lighting device 610 is installed on the utility pole P, and when the presence of the passerby H is detected by the human detection sensor unit 63, the light source unit 61 is brightly lit to turn on the lighting device 610. Increase the illuminance of the light emitted from In addition, the illumination device 610 reduces the illuminance of light emitted from the illumination device 610 by lowering the brightness of the light source unit 61 when the presence detection sensor unit 63 does not detect the presence of the passerby H. .

  The lighting device 610 detects the presence of the passerby H and changes the illuminance of the light emitted from the light source unit 61 within a specific illuminance range, so that the passerby H does not feel uncomfortable, and the crime on the road It is possible to have a threatening effect that suppresses the occurrence of In the above-described lighting device 610, when the presence of the passerby H is not detected, the illuminance of the light emitted from the light source unit 61 is reduced, which contributes to suppression of power consumption.

JP 2005-251724 A

By the way, in the brightness under the environment where the lighting device 610 such as a street lamp is lit, the sensitivity state of the human eye is in a state called twilight vision. The twilight vision is a visual state intermediate between photopic vision and scotopic vision, and the brightness of the surrounding environment is, for example, 0.001 to 10 cd / m ^2. .

  The photoreceptors of the human eye include photoreceptors called cones with low light sensitivity that distinguish colors in bright places, and photoreceptors called rods with high photosensitivity that work in dark places that distinguish light and dark. .

  Spectral luminous efficiency differs between a rod-shaped body that functions in an environment of dark place vision and a cone that functions in a bright environment called photopic vision. The human eye generally has a spectral characteristic that peaks at 555 nm in photopic vision and 507 nm in dark vision. Moreover, in the human eye, both the cones that are active in photopic vision and the rods that are active in dark vision are active in mesopic vision.

  For this reason, the brightness perceived by humans differs between the photopic vision state and the scotopic vision state due to the spectral distribution of the irradiated light. In particular, in the case of dimming, the sensitivity characteristics of the human eye tend to change depending on the brightness of the surrounding environment to which the human is adapting.

  That is, when the illumination device 610 changes the brightness of light irradiated with the same spectral distribution from the light source unit 61 of the illumination device 610, the brightness perceived by the passerby H is different from the change in the amount of light flux. .

  Even if the light source unit 61 is designed on the basis of photometric values such as luminous flux, illuminance, and luminance with reference to the visibility in photopic vision, the illumination device 610 is dim for human eyes. There may be cases where it is not perceived as bright enough for visual observation. In addition, when the lighting device 610 is simply controlled to be lit with an illuminance that a human feels to have a predetermined sufficient brightness, the lighting device 610 may consume unnecessary power. Therefore, if the visibility of the light irradiated from the light source unit 61 is increased, the illumination device 610 can also reduce power consumption as a result.

  This invention is made | formed in view of the said reason, The objective is to provide the illuminating device which can make the visibility by irradiation light higher.

  An illumination device of the present invention includes a lighting circuit unit that turns on a light source unit that emits light within a predetermined irradiation range, a human detection sensor unit that detects the presence of a person within at least the irradiation range, and the human detection When the presence of a person is not detected by the sensor unit, the light emitted from the light source unit is controlled to the first color temperature, and the light source is detected when the presence of the person is detected by the human detection sensor unit. And a color temperature control unit that controls the light emitted from the unit to a second color temperature that is lower than the first color temperature.

  In this illumination device, the light source unit includes at least a first light source and a second light source that emits light having a color temperature relatively lower than light emitted from the first light source. The temperature control unit changes the light emitted from the light source unit to the second color temperature by causing the light emitted from the second light source to be the first output, and the light emitted from the second light source. It is preferable that the light emitted from the light source unit is controlled to the first color temperature by making the value lower than the first output.

  In the illumination device, the light source unit has a lower color temperature on the center side in the irradiation range than the light emitted from the second light source, and the first light source. The light emitted from one light source preferably has a higher color temperature on the peripheral side in the irradiation range than the light emitted from the second light source.

  In the illumination device, the first light source and the second light source of the light source unit may include a light emitting unit having a high color temperature and a light emitting unit having a color temperature lower than that of the light emitting unit. The second light source has a light emitting part having a color temperature lower than that of the first light source in the same region from the peripheral part side to the central part side. It is preferable.

  In the illuminating device of this invention, there exists an effect that the visibility by irradiation light can be made higher.

The illuminating device of Embodiment 1 is shown, (a) is a schematic block diagram, (b) is a schematic explanatory drawing, (c) is a principal part top view. The lighting operation of the illumination device is shown, (a) is an operation explanatory diagram, (b) is a timing diagram showing the operation timing. The principal part of the illuminating device of Embodiment 2 is shown, (a) is a principal part top view, (b) is a principal part structure top view, (c) is another principal part structure top view. It is a schematic block diagram of an illuminating device same as the above. It is operation | movement explanatory drawing of an illuminating device same as the above. The conventional illuminating device is shown, (a) is a structural block diagram, (b) is operation | movement explanatory drawing.

(Embodiment 1)
Hereinafter, the illumination device of the present embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the illumination device 10 according to the present embodiment includes at least an illumination circuit unit 2 connected to an external commercial power source for lighting the light source unit 1 that irradiates light within a predetermined illumination range S, and the like. The human detection sensor unit 3 that detects the presence of a person (for example, a passer-by H) within the range S, and the light source unit 1 emits light when the presence of the passer-by H is not detected by the human detection sensor unit 3 The first color temperature (for example, daylight color) is controlled, and the light emitted from the light source unit 1 when the presence detection sensor unit 3 detects the presence of the passerby H is the first color. And a color temperature control unit 4 that controls to a second color temperature (for example, a light bulb color) having a color temperature lower than the temperature.

  More specifically, as shown in FIG. 1B, the lighting device 10 of the present embodiment is attached to a pole P such as a utility pole or an iron pole standing on a roadside, a park or a parking lot. The lighting device 10 holds the light source unit 1 inside a rectangular parallelepiped lamp body 21. The illuminating device 10 is provided with a cover 22 on the front side of the lamp body 21 so as to be detachable. In addition, the human detection sensor unit 3 in the lighting device 10 is attached at a high position of the support column P in order to easily detect the presence of the passerby H within the irradiation range S of the light irradiated from the light source unit 1. It is provided at the tip of the lighting device 10.

  As shown in FIG.1 (c), the illuminating device 10 of this embodiment is used as the light source part 1 in the lamp main body 21, and at least from the 1st light source 1a and the light irradiated from this 1st light source 1a. A second light source 1b that emits light having a relatively low color temperature is held. The first light source 1a is a light emitting device 11 capable of emitting daylight light, and a plurality of (here, twelve) light sources are provided on one surface side of the rectangular wiring board 1c. The second light source 1b is a light emitting device 12 that can emit light bulb-colored light, and a plurality of (here, twelve) light sources are provided on one surface side of the rectangular wiring board 1c. The light emitting device 11 that is the first light source 1a of the light source unit 1 and the light emitting device 12 that is the second light source 1b are arranged in two rows in a nested manner in a plan view. Although not illustrated, the lighting device 10 includes a lighting circuit unit 2 and a color temperature control unit 4 as power supply units that can supply power to the light source unit 1, and a lamp on the opposite side of the cover 22 via the light source unit 1. It is housed inside the main body 21.

  The light source unit 1 used in such an illuminating device 10 can be configured using light emitting devices 11 and 12 each including a solid light emitting element capable of emitting light when energized. Examples of the solid light emitting element include an LED (light emitting diode) chip and an organic EL (electroluminescent) element. Examples of the light emitting devices 11 and 12 include an LED chip that emits blue light and a phosphor that absorbs blue light and emits fluorescent light having a longer wavelength and can emit white light. Such light-emitting devices 11 and 12 use the same kind of LED chip that emits blue light, and change the phosphor content and the type of the phosphor to change the light emitted from the light-emitting devices 11 and 12 to a predetermined level. The color temperature can be changed.

  In the illuminating device 10 of the present embodiment, the color temperature of the light source unit 1 is changed in accordance with the sensitivity of a human receptor in a low vision environment. Therefore, when the light emitting devices 11 and 12 having the same kind of LED chip that emits blue light are used as the first light source 1a and the second light source 1b of the light source unit 1, the light emitting device 11 and the light emitting device 12 are: Those that can emit light having different color temperatures using different types of phosphors are preferred. That is, the light-emitting devices 11 and 12 mainly emit light from the light-emitting device 11 among the light emitted from the light-emitting device 11. It is preferable to use a phosphor having a shorter wavelength than the emission spectrum of fluorescence emitted from the phosphor. Alternatively, each of the light emitting devices 11 and 12 can be configured to include a plurality of types of phosphors. In this case, the light emitting devices 11 and 12 are mainly light emitting devices out of the light emitted from the light emitting device 11, and the light emission spectrum of the fluorescence emitted mainly from the phosphor of the light emitting device 11 is mainly emitted from the light emitting device 12. It is preferable to increase the content of phosphors that emit fluorescence having a shorter wavelength so as to be on the shorter wavelength side than the emission spectrum of the fluorescence emitted from the 12 phosphors.

  LED chips capable of emitting blue light include, for example, an n-type gallium nitride compound semiconductor layer on a SiC substrate, a light emitting layer made of a gallium nitride compound semiconductor containing In, and a p-type gallium nitride compound semiconductor. What laminated | stacked the layer in order can be used. The LED chip may be provided with an anode electrode electrically connected to the p-type gallium nitride compound semiconductor layer and a cathode electrode formed on the SiC substrate.

As a phosphor that absorbs blue light from the LED chip and emits light of a different color tone, for example, a Y ₃ Al ₅ O ₁₂ phosphor activated with Ce or a Tb ₃ Al ₅ O activated with Ce _In addition to aluminate phosphors such as ₁₂ phosphors, silicate phosphors such as Ba ₂ SiO ₄ phosphors activated by Eu and (SrBa) ₂ SiO ₄ phosphors activated by Eu, CaAlSiN ₃ phosphor activated by Eu, Sr ₂ Si ₅ N ₈ phosphor activated by Eu, Ca ₂ Si ₅ N ₈ phosphor activated by Eu, SrSi ₇ N activated by Eu A nitride-based phosphor such as a CaSi ₇ N ₁₀ phosphor activated by the ₁₀ phosphor Eu can also be employed.

  For example, the light emitting devices 11 and 12 appropriately combine LED chips and phosphors, for example, a daylight color light having a correlated color temperature of 6510K, a daylight white light of 5030K, a white light of 4170K, a warm white of 3460K. And 2840K light bulb color light can be emitted.

The light source unit 1 in the illumination device 10 of the present embodiment includes, as the first light source 1a, an LED chip having a gallium nitride compound semiconductor capable of emitting blue light, and Ce that emits yellow-green light by absorbing blue light. The light emitting device 11 including the Y ₃ Al ₅ O ₁₂ phosphor activated in step 1 is used. The light source unit 1 is used as a second light source 1b for an LED chip having a gallium nitride compound semiconductor capable of emitting blue light and a light emitting device 11 that absorbs blue light and becomes the first light source 1a. An SrCaSiN phosphor activated with Eu that emits longer-wavelength fluorescence than a phosphor; a Y ₃ Al ₅ O ₁₂ phosphor activated with Ce that absorbs blue light and emits yellow-green light; Is used.

  Each of the light emitting devices 11 and 12 can be configured by mounting an LED chip on a mounting substrate (not shown). The LED chip is sealed with a translucent resin that contains the above-described phosphors. The translucent resin can improve the light extraction efficiency from the LED chip, and when the LED chip is electrically connected by a wire (not shown) or the like to form a power feeding path, It can also be protected.

  The light emitting devices 11 and 12 are not limited to the above-described configuration. For example, the light emitting devices 11 and 12 have a common outer shape, and are formed with a recessed portion recessed inside and a pair of conductor patterns (not shown) on the inner bottom surface of the recessed portion. You may use what was stored in the inside of a package. In the light emitting devices 11 and 12, an LED chip may be mounted on the inner bottom surface of the recess in the package. Moreover, the light-emitting devices 11 and 12 should just arrange | position the translucent resin in which the above-mentioned fluorescent substance contained in the said recessed part.

  The light emitting devices 11 and 12 constitute a power supply path for the LED chip using the pair of conductor patterns (for example, a conductor pattern plated with Au on the outermost surface) on the inner bottom surface of the recess in the package. Can do.

  For the packages of the light emitting devices 11 and 12, a ceramic substrate using alumina, aluminum nitride, or the like, a metal base substrate using a metal material such as Cu, Al, or Fe, an epoxy resin substrate, or the like can be used. Further, as the package of the light emitting devices 11 and 12, for example, a package in which a pair of metal conductors are integrally formed of a resin material such as an acrylic resin or an epoxy resin may be used. In this case, the light emitting devices 11 and 12 may cause the LED chip and the pair of metal conductors to be electrically connected to each other so that the pair of metal conductors exposed from the resin material function as external electrodes of the light emitting devices 11 and 12. .

  The light emitting devices 11 and 12 may be appropriately electrically connected by a wiring pattern (not shown) formed on one surface of the wiring substrate 1c with AuSn or the like to form a power feeding path. In the light source unit 1, a plurality of light emitting devices 11 as first light sources 1 a arranged on the wiring board 1 c are connected in series. Similarly, the light source unit 1 has a plurality of light emitting devices 12 as second light sources 1b arranged on the wiring board 1c connected in series. The 1st light source 1a and the 2nd light source 1b are electrically connected with the said wiring pattern of the wiring board 1c so that it can light each independently by electric power feeding.

  Lighting of the first light source 1 a and the second light source 1 b of the light source unit 1 is controlled by power feeding from the lighting circuit unit 2 based on a signal from the color temperature control unit 4. The light source unit 1 is not limited to the light emitting devices 11 and 12 using LED chips, and a discharge lamp such as a fluorescent lamp, a mercury lamp or an incandescent lamp can be used. When a discharge lamp such as a fluorescent lamp is used, the light source unit 1 can set the color temperature of the light source unit 1 to a predetermined color temperature by changing the type of phosphor to change the color temperature. When using an incandescent lamp, the light source unit 1 can change the color temperature of the light source of the incandescent lamp provided with the color filter to a predetermined color temperature. When a fluorescent lamp or an incandescent lamp is used as the light source unit 1, the light reflected from the fluorescent lamp or the incandescent lamp is reflected on the lamp body 21 in order to efficiently irradiate the irradiation range S with the light from the fluorescent lamp or the incandescent lamp. A plate may be provided as appropriate.

  Note that the first light source 1a and the second light source 1b constituting the light source unit 1 are not necessarily the same type of light source. For example, the first light source 1a that emits daylight white light is used. In addition to the light emitting device 11 using an LED chip, the second light source 1b that emits warm white light may be a fluorescent lamp.

  The lighting circuit unit 2 may be appropriately set according to the type of the light source unit 1. For example, when the light emitting devices 11 and 12 using LED chips are used as the first light source 1 a and the second light source 1 b, What is necessary is just to comprise suitably by the AC-DC converter which converts the commercial alternating current power supplied from DC into direct current power, the current limiting resistance, the drive control part which controls the electric current which flows into each light-emitting device 11 and 12, etc. Note that the lighting circuit unit 2 of the lighting device 10 is configured using a DC-DC converter instead of the above-described AC-DC converter when connected to a solar cell, a wind power generator, or the like as a power source supplied to the light source unit 1. That's fine. When a fluorescent lamp is used as the light source unit 1, the lighting circuit unit 2 of the lighting device 10 may be an electronic ballast using an inverter circuit.

  In the illumination device 10 of the present embodiment, the light source unit 1 is disposed inside a lamp body 21 having a cover 22 made of a light-transmitting material and covering the front side of the light source unit 1. The light source unit 1, the lighting circuit unit 2, and the color temperature control unit 4 may be appropriately stored in the lamp body 21, but are not necessarily stored in the lamp body 21 integrally with the light source unit 1. That is, the lighting device 10 includes a lamp body 21 that houses the light source unit 1 and a human detection sensor so that the light source unit 1, the lighting circuit unit 2, the human detection sensor unit 3, and the color temperature control unit 4 can be easily inspected. It is good also as a separate body from the container which accommodates the part 3, the color temperature control part 4, etc. FIG.

  The human detection sensor unit 3 used in the lighting device 10 of the present embodiment can be configured by a sensor unit including a pyroelectric sensor that detects a heat ray emitted from a passerby H, for example. The pyroelectric sensor which is a sensor constituting the human detection sensor unit 3 is attached to a support column P which is a high place in order to easily detect the presence of a passerby H in the irradiation range S of the light irradiated from the light source unit 1. The illumination device 10 is provided at the tip portion. Note that the irradiation range S of the light emitted from the light source unit 1 may be arbitrarily set, and does not necessarily have to be a range in which all the light from the light source unit 1 reaches, and the light emitted from the light source unit 1 is predetermined. You may set to the range which maintains the illumination intensity.

  Note that the number of sensors of the human detection sensor unit 3 is not limited to one, and a plurality of sensors may be arranged. In this case, the lighting device 10 may input the output of each sensor to the color temperature control unit 4. The direction of each sensor is variable with respect to the lamp body 21, and the detection range can be changed by changing the direction of each sensor. That is, by making the directions of the sensors different from each other, it is possible to widen the detection range of the human detection sensor unit 3. Therefore, the human detection sensor unit 3 may be wider than the irradiation range S where light is emitted from the light source unit 1.

  For example, when arranging a plurality of lighting devices 10 adjacent to each other as street lamps, the lighting devices 10 have a detection range wider than the irradiation range S irradiated with light from the light source unit 1 of each lighting device 10. It is also possible to overlap the detection ranges. Thereby, the illuminating device 10 can change the color temperature irradiated from the light source part 1 of each illuminating device 10 in the moving direction of the passer-by H before the passer-by H moves.

  The human detection sensor unit 3 is not limited to the one provided with the pyroelectric sensor, and may be provided with an image sensor such as a CCD or a CMOS. Similarly, as the human detection sensor unit 3, an infrared camera, a thermal image sensor, or the like can detect the presence or absence of a passerby H and transmit a detection result signal to the color temperature control unit 4 wirelessly or by wire. Good.

  The color temperature control unit 4 used in the lighting device 10 of the present embodiment controls the lighting circuit unit 2 to be supplied to the first light source 1a and the second light source 1b of the light source unit 1 when the light source unit 1 is turned on. It is possible to adjust the power.

  For example, the color temperature control unit 4 of the lighting device 10 of the present embodiment turns on only the first light source 1a of the light source unit 1 when the passerby H is not detected by the human detection sensor unit 3. Thereby, the color temperature of the light in the irradiation range S of the illumination device 10 becomes the first color temperature. Further, the color temperature control unit 4 of the lighting device 10 turns on the second light source 1b in addition to the first light source 1a of the light source unit 1 when the passerby H is detected by the human detection sensor unit 3. Let Thereby, the color temperature of the light in the irradiation range S of the illumination device 10 becomes the second color temperature in which the color temperature of the light in the irradiation range S is lower than the first color temperature.

  In other words, the color temperature control unit 4 changes the light emitted from the light emitting device 12 serving as the second light source 1b to the first output by setting the light emitted from the light source unit 1 to the second color temperature. The light emitted from the light emitting device 21 as the second light source 1b is made lower than the first output so that the light emitted from the light source unit 1 is controlled to the first color temperature.

  That is, the color temperature control unit 4 used in the lighting device 10 of the present embodiment can simultaneously adjust the illuminance of light emitted from the light source unit 1 and the color temperature of light emitted from the light source unit 1. . Such a color temperature control unit 4 can be configured using a microcomputer or the like. That is, the color temperature control unit 4 controls the lighting circuit unit 2 based on a signal indicating the presence / absence of a passerby H from the human detection sensor unit 3 by a microcomputer or the like, and is irradiated from the light source unit 1. The color temperature of the light to be adjusted can be adjusted.

  The color temperature control unit 4 in the illumination device 10 of the present embodiment functions as a color temperature control unit. In addition to this, the color temperature control unit 4 in the illumination device 10 may include an illuminance sensor made of a photodiode (not shown). The color temperature control unit 4 can also be used as illuminance control means for determining the brightness of the surrounding environment of the lighting device 10 based on a signal from the illuminance sensor and adjusting the intensity of light emitted from the light source unit 1. For example, the color temperature control unit 4 turns off the light source unit 1 when the output of the illuminance sensor is equal to or higher than a predetermined threshold, that is, in the daytime when the surroundings are bright, and the output of the illuminance sensor is lower than the predetermined threshold, that is, It can be set as the structure provided with the electronic circuit which lights the light source part 1 at the night etc. where the circumference | surroundings are dark.

  Next, the case where a plurality of lighting devices 10 of the present embodiment are used as street lights will be described with reference to FIG.

  The illuminating device 10 shown in FIG. 2 is installed in the upper part of the support | pillar P as a street light. A plurality (two in this case) of the illumination devices 10 are arranged adjacent to each other so that the irradiation ranges S of the light emitted from the light source unit 1 of the illumination device 10 overlap each other.

  For example, as shown in the right side lighting device 10 in FIG. 2A, the lighting device 10 is irradiated by the first light source 1a regardless of whether the human detection sensor unit 3 detects the presence or absence of the passerby H. The range S is illuminated with daylight-colored light (see the dashed arrow in FIG. 2A) to ensure a minimum brightness as a street light. That is, the lighting device 10 always outputs power from the lighting circuit unit 2 when the light source unit 1 is lit (see the broken line in FIG. 2B), and the lighting device 10 has a relatively high color temperature. The light source 1a always emits light of daylight color.

  In addition, as shown in the left side lighting device 10 in FIG. 2A, the lighting device 10 detects that the passerby H is detected by the human detection sensor unit 3, and the lighting circuit unit 2 is added to the first light source 1a. The second light source 1b having a color temperature relatively lower than that of the first light source 1a is turned on to irradiate light bulb color light (see the dashed line arrow in FIG. 2A). That is, the lighting device 10 outputs power from the lighting circuit unit 2 only when the human detection sensor unit 3 detects a passerby (refer to the alternate long and short dash line in FIG. 2B) and has a relatively low color temperature. The second light source 1b is turned on. Thereby, the illuminating device 10 makes the brightness of the light emitted from the light source 1 when the first light source 1a and the second light source 1b irradiate the irradiation range S brighter than when there is no passerby H. In addition, the color temperature can be lowered.

  In the illumination device 10 of the present embodiment, when the human detection sensor unit 3 does not detect the passerby H, the light source unit 1 lights only the first light source 1a. Although the brightness is lower than when the light source 1a and the second light source 1b are turned on, the power consumption can be suppressed.

  However, in the illumination device 10 according to the present embodiment, when the first light source 1a is relatively bright in the state of mesopic vision, the first light source 1a emits daylight color light having a high color temperature that increases human mesopic sensitivity. As a result, the illumination device 10 simply increases the visibility of the human eye in dimmed vision as compared with the case where the output of the light source unit designed with the visibility of the human eye in the photopic vision state is reduced. It becomes possible to do.

  Therefore, the illuminating device 10 of the present embodiment has a light source that matches the sensitivity of the eyes in photopic vision in thin vision, compared to the case where the output of the light source unit matched to the sensitivity of the eyes in photopic vision is simply reduced. It is also possible to suppress power consumption while ensuring the same visibility.

  Further, in the illumination device 10, the brightness in the irradiation range S is increased when the second light source 1b emits light in addition to the first light source 1a. The illuminating device 10 has a light source so that the twilight sensitivity at the brightness when the first light source 1a and the second light source 1b are turned on is higher than that when only the first light source 1a has the same brightness. The spectral distributions of the first light source 1a and the second light source 1b of the unit 1 are set. Thereby, the illuminating device 10 can make it feel brighter even in the same amount of light flux by increasing the amount of light having a short wavelength component in a dimmed state under darker conditions than in a brighter state. .

  Note that, as shown in FIG. 2B, the lighting device 10 has the color temperature control unit 4 intermittently control the turning on and off of the second light source 1b every time the passer-by H passes. In addition to performing abruptly, the color temperature control unit 4 may control the lighting circuit unit 2 so that the lighting of the second light source 1b can be faded in. Similarly, the color temperature control unit 4 may control the lighting circuit unit 2 so that the turn-off of the second light source 1b can be faded out.

  Thereby, the lighting device 10 causes the second light source 1b of the light source unit 1 to smoothly turn on and off by the lighting circuit unit 2 fading in and fading out the turning on and off of the second light source 1b. It is possible to reduce the sense of discomfort of the passerby H when the light source 1b is turned on or the second light source 1b is turned off.

  Since the lighting circuit unit 2 causes the lighting circuit unit 2 to fade in and fade out the lighting and extinguishing of the second light source 1b, for example, the color temperature control unit 4 changes the ratio between the lighting time and the lighting time in a predetermined time, What is necessary is just to provide the circuit which carries out PWM control of the output of the 2nd light source 1b.

  In addition, when the passer-by H is no longer detected by the human detection sensor unit 3, the lighting device 10 not only immediately turns on the first light source 1 a but also the passer-by H passes through the human detection sensor unit 3. Even after no longer being detected, the second light source 1b may be kept on for a predetermined holding time (for example, 10 seconds).

  The lighting device 10 of the present embodiment always turns on the first light source 1a, and adds the second light source 1b to the first light source 1a only when the human detection sensor unit 3 detects a passerby H. It is not limited to lighting up. That is, the lighting device 10 turns on the first light source 1a when the passerby H is not detected, and turns on only the second light source 1b when the human detection sensor unit 3 detects the passerby H. Alternatively, the color temperature control unit 4 may control the lighting circuit unit 2.

  The illumination device 10 of the present embodiment is not limited to changing the brightness of light emitted from the light source unit 1 depending on the presence or absence of a passerby H, and the color temperature of the light emitted from the light source unit 1 is set to each brightness. The spectral distribution is adapted to the state of dimming. Thereby, the illuminating device 10 of this embodiment can make the visibility by illumination light higher, and can reduce power consumption under the state of thin vision.

(Embodiment 2)
The illuminating device 10 of the present embodiment uses a plurality of types (here, four types) shown in FIG. 3 instead of using the light source unit 1 including the two types of light emitting devices 11 and 12 of the first embodiment shown in FIG. ) Is different in that the light source unit 1 including the light emitting devices 11, 12, 13, and 14 is used. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 1, and description is abbreviate | omitted suitably.

  As shown in FIG. 3A, the light source unit 1 used in the lighting device 10 of the present embodiment has a plurality of light emitting devices 11, 12, 13, and 14 as a light source unit 1 in a lamp main body 21. The wiring board 1c is arranged on one surface side. The light source unit 1 of the illuminating device 10 emits at least a first light source 1a (see FIG. 3B) and light having a color temperature relatively lower than the light emitted from the first light source 1a. The second light source 1b (see FIG. 3C) is held. The light source unit 1 includes a light emitting device 11 capable of emitting daylight color light, a light emitting device 13 capable of emitting daylight white light, and a light emitting device 14 capable of emitting warm white light as the first light source 1a. . Each of the light emitting devices 11, 13, and 14 of the first light source 1a is provided in plural (here, twelve in each case) on one surface side of the rectangular wiring board 1c. The light source unit 1 includes, as the second light source 1b, a light emitting device 12 capable of emitting light bulb light, a light emitting device 13 capable of emitting daylight white light, and a light emitting device 14 capable of emitting warm white light. I have. A plurality of light emitting devices 12, 13, and 14 of the second light source 1b are provided on the one surface side of the rectangular wiring board 1c (here, twelve in each case).

  The first light source 1a of the light source unit 1 includes light emitting devices 11 and 13 that are light emitting units having a relatively higher color temperature than white light, and a light emitting device 14 that is a light emitting unit having a lower color temperature than the light emitting unit. 1 from the peripheral part side toward the central part side of the light source part. The second light source 1b of the light source unit 1 includes a light emitting device 13 that is a light emitting unit having a relatively higher color temperature than white light, and light emitting devices 12 and 14 that are light emitting units having a lower color temperature than the light emitting unit. The light source unit 1 is provided from the peripheral side to the center side of the light source unit.

  Further, in the same region from the peripheral side to the central side, the second light source 1b has a light emitting device 13 having a color temperature lower than that of the light emitting device 11 of the first light source 1a. In the same region from the peripheral side to the central side, the second light source 1b has a light emitting device 14 having a lower color temperature than the light emitting device 13 of the first light source 1a. Similarly, in the same region from the peripheral portion side to the central portion side, the second light source 1b has a light emitting device 12 having a color temperature lower than that of the light emitting device 14 of the first light source 1a.

  The illuminating device 10 is generally designed so that the brightness of the central portion, which is substantially directly under the light irradiated from the light source unit 1 in the irradiation range S, is bright and becomes darker as it goes from directly under the light source unit 1 to the periphery. . For this reason, the illumination device 10 has different human eye sensitivities in accordance with the brightness even within the irradiation range S of the light source unit 1.

As shown in FIG. 3A, the light source unit 1 in the illumination device 10 of the present embodiment includes a first light source 1a and a second light source 1b. The first light source 1 a of the light source unit 1 includes a light emitting device 11 as a light emitting unit having a high color temperature, and a light emitting device 14 as a light emitting unit having a color temperature lower than that of the light emitting device 11. Between the light emitting device 11 and the light emitting device 14, a light emitting device 13 that emits a color temperature between the color temperature of light emitted from the light emitting device 11 and the color temperature of light emitted from the light emitting device 14 is disposed. . The second light source 1 b of the light source unit 1 includes a light emitting device 13 as a light emitting unit having a high color temperature, and a light emitting device 12 as a light emitting unit having a lower color temperature than the light emitting device 13. Between the light emitting device 13 and the light emitting device 12, a light emitting device 14 that emits a color temperature between the color temperature of the light emitted from the light emitting device 13 and the color temperature of the light emitted from the light emitting device 12 is disposed. . The light source unit 1 is a light emitting unit having a color temperature lower than that of the light emitting devices 11, 13, and 14, which are light emitting units of the first light source 1 a, on the center side of the light source unit 1 in the plan view. Therefore, the light source unit 1 of the illuminating device 10 of the present embodiment is configured so that the light emitted from the second light source 1b is more than the light emitted from the first light source 1a. Also, the color temperature is lower on the center side in the irradiation range S, and the light emitted from the first light source 1a is more colored on the peripheral side in the irradiation range S than the light emitted from the second light source 1b. The temperature rises. That is, the light source unit 1 includes the second light source 1b and the first light source 1a in the irradiation range S so that the color temperature increases from the central part side to the peripheral part in accordance with each brightness level. The light distribution is designed.

  As a result, the lighting device 10 according to the present embodiment has a traveling direction on the road surface of the passer-by H (in FIG. 4) when the lighting devices 10a and 10b having the same configuration are arranged adjacent to each other as in the street lamp shown in FIG. The left side to the right side of the light source section 1 so that the color temperature increases in the order of the areas A, B, and C (areas a, b, and c) from the center side to the outer peripheral side of the irradiation range S. Can be irradiated with light.

  Here, the lighting device 10 is, for example, each light-emitting device that is the first light source 1a having a relatively high color temperature of the lighting device 10 regardless of whether the human detection sensor unit 3 detects the presence or absence of the passerby H. 11, 13, and 14 are always lit. Each light-emitting device 11, 13, and 14 which is the 1st light source 1a is radiating | emitting to the area | region a of FIG. 4, the area | region b, and the area | region c, respectively (refer the illuminating device 10a of the right side of FIG. 4). Note that a large amount of warm white light from the light-emitting device 14 is radiated in the region a surrounded by the dashed line in FIG. Further, in the region b surrounded by the one-dot chain line and the two-dot chain line in FIG. 4, much white light from the light emitting device 13 is emitted. Further, in the region c surrounded by the two-dot chain line and the broken line in FIG. 4, a lot of daylight color light is emitted from the light emitting device 11.

  Thereby, as for the illuminating device 10, the 1st light source 1a irradiates the irradiation range S, and has ensured the minimum brightness as a street lamp (refer the illuminating device 10a on the right side of FIG. 4).

  In addition, when the human detection sensor unit 3 detects a passerby H, the lighting device 10 has a light emitting device 12, which is a second light source 1b whose lighting circuit unit 2 has a relatively lower color temperature than the first light source 1a. 13 and 14 are turned on. The light-emitting devices 12, 13, and 14 as the second light source 1b radiate to the region A, the region B, and the region C in FIG. 4 (see the illumination device 10b on the left side in FIG. 4). Here, in the region A surrounded by the one-dot chain line in FIG. 4, a lot of light bulb color light is emitted from the light emitting device 12. Further, in the region B surrounded by the alternate long and short dash line in FIG. 4, much warm white light from the light emitting device 14 is emitted. Further, in the region C surrounded by the two-dot chain line and the broken line in FIG. 4, a lot of white light from the light emitting device 13 is emitted.

  Thereby, the illuminating device 10 makes the brightness of the light emitted from the light source 1 when the first light source 1a and the second light source 1b irradiate the irradiation range S brighter than when there is no passerby H. In addition, the color temperature can be lowered.

  As shown in FIG. 5, the lighting device 10 according to the present embodiment includes two lighting circuit units 2 connected to an external commercial power source that lights a light source unit 1 that emits light within a predetermined irradiation range S, A human detection sensor unit 3 that detects the presence of a person (for example, a passer-by H) at least within the irradiation range S, and a light source unit 1 when the presence of the passer-by H is not detected by the human detection sensor unit 3 The light emitted from the light source unit 1 is controlled to a first color temperature (for example, daylight color) and the light emitted from the light source unit 1 when the presence detection sensor unit 3 detects the presence of the passer-by H. And a color temperature control unit 4 that controls the color temperature to a second color temperature (for example, a light bulb color) that is lower than the color temperature.

  Thereby, the illuminating device 10 of this embodiment is not restricted only to changing the brightness of the light irradiated from the light source part 1 by the presence or absence of the passer-by H similarly to the illuminating device 10 of Embodiment 1, but the light source The color temperature of the light emitted from the unit 1 is a spectral distribution that matches the state of dimming at each brightness. Moreover, in the irradiation range S where the light source unit 1 of the illumination device 10 emits light, the light source unit 1 has a spectral distribution that matches the state of dimming at each brightness. Therefore, the illumination device 10 according to the present embodiment can have higher visibility by illumination light and can reduce power consumption under the condition of thin vision.

S Irradiation range H Passerby (person)
DESCRIPTION OF SYMBOLS 1 Light source part 1a 1st light source 1b 2nd light source 2 Lighting circuit part 3 Human detection sensor part 4 Color temperature control part 10 Illumination device

Claims (4)

  A lighting circuit unit that turns on a light source unit that emits light within a predetermined irradiation range, a human detection sensor unit that detects the presence of a person within at least the irradiation range, and presence of a human by the human detection sensor unit The light emitted from the light source unit when it is not detected is controlled to the first color temperature, and the light emitted from the light source unit when the presence of a human being is detected by the human detection sensor unit. An illumination device comprising: a color temperature control unit configured to control a second color temperature lower than the first color temperature.   The light source unit includes at least a first light source and a second light source that emits light having a color temperature relatively lower than light emitted from the first light source, and the color temperature control unit includes: The light emitted from the light source unit is set to the first output by causing the light emitted from the second light source to be the first output, and the light emitted from the second light source is changed to the first output. The illumination device according to claim 1, wherein the light emitted from the light source unit is controlled to the first color temperature by making the output lower than the output.   The light source unit emits light from the second light source having a lower color temperature on the central portion side in the irradiation range than light emitted from the first light source and from the first light source. The illumination device according to claim 2, wherein the color temperature is higher on the peripheral side in the irradiation range than the light emitted from the second light source. The first light source and the second light source of the light source unit respectively include a light emitting unit having a high color temperature and a light emitting unit having a color temperature lower than that of the light emitting unit from the peripheral side of the light source unit. The second light source has a light emitting part having a color temperature lower than that of the first light source in the same region from the peripheral part side to the central part side. The illumination device according to claim 1.

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