JP2015162420A - Illumination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination apparatus capable of preventing a lighting state of a light source from being controlled undesirably by radiant light of the light source.SOLUTION: An illumination apparatus 11 includes: a light-emitting unit 29 having a light source 40 disposed on one side thereof, a light sensor 31 that is disposed on the other side of the light-emitting unit 29 and that senses ambient brightness without operating upon receipt of radiant light of the light source 40; a lighting device 30 to light the light source 40 according to sensing of the light sensor 31; and an apparatus body 12 to accommodate therein the light-emitting unit 29 and the light sensor 31.

Description

  The present embodiment relates to a lighting device using a light source such as an LED or an organic EL.

  Some crime prevention lights, street lights, road lights, and the like control the lighting state of a light source according to ambient brightness (illuminance). That is, the brightness of the surroundings is sensed by a light sensor, the light source is turned off or dimmed when the surroundings are bright, such as during the daytime, and the light source is turned on when the surroundings are dark. And the optical sensor is arrange | positioned in the apparatus main body at the back side of a light source so that the emitted light of a light source may not be sensed (for example, refer patent document 1).

Japanese Patent Laying-Open No. 2013-125673 (5th page, FIG. 1)

  However, for example, when snow accumulates on the outer surface side of the apparatus main body, the emitted light of the light source is reflected by the snow and enters the light sensor, and the light sensor senses the brightness and turns off or dims the light source. There was a problem.

  An object of the present embodiment is to provide an illumination device that can prevent the lighting state of the light source from being undesirably controlled by the emitted light of the light source.

  The illuminating device of this embodiment includes a light emitting unit, a light sensor, a lighting device, and a device body. The light emitting unit has a light source disposed on one side thereof. The optical sensor senses the brightness of the surroundings without operating by receiving light emitted from the light source, and is disposed on the other side of the light emitting unit.

  The lighting device turns on the light source in response to detection by the optical sensor. The apparatus main body contains at least a light emitting unit and an optical sensor.

  According to the illumination device of the present embodiment, the light sensor senses the surrounding brightness without operating by receiving light emitted from the light source, and therefore it can be expected that the lighting state of the light source is not controlled by the light emitted from the light source.

It is a schematic perspective view of the illuminating device which shows embodiment of this invention. FIG. 2 is a side sectional view of FIG. FIG. 2 is a longitudinal sectional view of FIG. It is explanatory drawing which shows the spectrum of LED same as the above. It is explanatory drawing which shows the sensitivity with respect to the wavelength of an optical sensor same as the above. It is explanatory drawing which shows the spectrum of sunlight same as the above.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing an example of a lighting device showing an embodiment of the present invention. FIG. 1 shows a case where the lighting device is a security light. The illuminating device 11 includes a translucent cylindrical cover 12 as a device main body, a base portion 14 attached to the base end portion 13 side of the cylindrical cover 12, and an arm 15.

  As for the cylindrical cover 12, the top part 16 is obstruct | occluded, the opening part 17 is formed in the base end part 13 side, and forms the cylinder shape as a whole. The cylindrical cover 12 is composed of a cylinder body 18 on the top 16 side and a flange 19 on the base end 13 side. The flange 19 of the base end 13 has a cylindrical outer periphery, The outline of the opening 17 is also circular. The cylinder body 18 is formed to extend from the flange portion 19 to the top portion 16 side, and is provided integrally with the flange portion 19 in a cylindrical shape slightly smaller than the outer diameter of the flange portion 19.

  A housing space that communicates with the opening 17 is formed inside the cylindrical cover 12, and this housing space is a substantially closed space that does not communicate with anything other than the opening 17. A light emitting unit 29 described later and a lighting circuit 30 as a lighting device are housed in the housing space.

  The cylindrical cover 12 is integrally formed of a translucent resin such as acrylic or polycarbonate, and has translucency as a whole. In addition, a white pigment and a light diffusing material are added to the translucent resin for forming the cylindrical cover 12, and the whole has a milky white appearance. In addition, the whole cylindrical cover 12 may be transparent, and a part may have a form which has translucency.

  The cylindrical main body 18 of the cylindrical cover 12 functions as a light projecting unit 20 that transmits the irradiation light to the road surface whose lower side is an irradiation surface, and the upper side functions as a shade 21. A wall portion 22 having a U-shaped cross section is formed to protrude above the flange portion 19 side of the cap portion 21. The wall portion 22 is formed at such a height that the tips thereof are aligned and flat.

  On the periphery of the cylindrical body 12 in the width direction of the cylindrical body 18, a step portion 23 that protrudes slightly outward from the outer peripheral surfaces of the light projecting portion 20 and the shade portion 21 is continuously formed in a band shape. By projecting the step portion 23 to the outside, the step portion 23 functions as a ridge of the light projecting unit 20, and it becomes difficult for water droplets during rainfall to flow down to the light projecting unit 20. Dirt is difficult to adhere to. Further, since the step portion 23 is continuously formed around the longitudinal direction of the cylinder body 18, the mechanical strength of the cylinder body 18 is also improved.

  The base portion 14 is attached to the cylindrical cover 12, closes the opening 17 of the cylindrical cover 12, and is connected to a lead wire 24 that supplies power to the light emitting unit 29 housed inside the cylindrical cover 12. ing. That is, the base portion 14 has a wiring portion 36 as will be described later, and power is supplied from the lead wire 24 to the lighting circuit 30 via the wiring portion 36.

  The arm 15 is detachably attached to the base portion 14 with screws or the like, and the cylindrical cover 12 to which the base portion 14 is attached is attached to a pole such as a utility pole installed on the road surface. The arm 15 has a curved portion 25 in which an intermediate portion of a U-shaped metal piece is curved in an approximately L shape, and a mounting band wound around a utility pole is passed through the rear end portion of the curved portion 25. A hole 26 and a dart hole 27 for locking the mounting screw are formed.

  At this time, the long axis direction of the cylindrical cover 12 is installed at an angle of about 20 ° to 50 ° with respect to the horizontal plane so that the top portion 16 side is directed upward by the curved portion 25 of the arm 15. Therefore, the opening 17 of the cylindrical cover 12 is always directed downward by about 20 ° to 50 ° in the installed state of the cylindrical cover 12, so that water droplets due to rain hardly enter the opening 17 and the waterproof performance is improved. To do. Furthermore, since the efficiency of the convection and heat exchange in the shade part 21 with a comparatively large surface area improves by making the top part 16 side of the cylindrical cover 12 face upwards, a heat dissipation characteristic can also be improved.

  Here, the distal end portion of the arm 15 is disposed so as to form a slight gap with the distal end of the wall portion 22 of the shade portion 21. This tip portion functions to maintain sufficient strength even with a load when used as a scaffold for the worker on the pole.

  FIG. 2 is a sectional side view of FIG. As shown in FIG. 2, the cylinder main body 18 of the cylindrical cover 12 is a tapered cylinder whose outer diameter decreases toward the top 16. In particular, the outer diameter dimension in the vertical direction of the cylinder body 18 has a larger rate of decreasing toward the top portion 16 than the outer diameter dimension in the width direction, and the cross-sectional shape of the cylinder body 18 in the vicinity of the top portion 16 is longer in the width direction. It becomes a flat, substantially elliptical shape.

  A housing space 28 communicating with the opening 17 is formed inside the cylindrical cover 12, and a light emitting unit 29, a lighting circuit 30 as a lighting device, and a light sensor 31 are housed in the housing space 28. The lighting circuit 30 and the optical sensor 31 are attached to the light emitting unit 29.

  Inside the step portion 23 of the cylindrical cover 12, a groove portion 32 for mounting the light emitting unit 29 in the accommodation space 28 is formed. The groove portions 32 are provided in the width direction at least along the longitudinal direction of the cylindrical cover 12, and a pair of groove portions 32 are formed when viewed from the opening 17. The pair of grooves 32 guides the insertion of the light emitting unit 29 when the light emitting unit 29 is mounted inside the cylindrical cover 12, and is below the center position of the cross section perpendicular to the longitudinal direction of the cylindrical cover 12. It is arranged at the side position. Therefore, when the light emitting unit 29 is attached to the cylindrical cover 12, the light emitting unit 29 is positioned below the center position of the cross section perpendicular to the longitudinal direction of the cylindrical cover 12.

  The base portion 14 has a closing portion 33 that closes the opening portion 17 of the cylindrical cover 12 and is formed in a bottomed cylindrical shape on the base end portion 13 side. The closing part 33 is inserted into the inside of the flange part 19 at the bottom side, and comes into contact with the joint part of the base end part 13 via the O-ring 34. The O-ring 34 is pressed and elastically deformed by the closing portion 33, and the inside of the opening portion 17 has a watertight structure to ensure waterproofness.

  A closing plate 35 that closes the opening 17 is provided on the distal end side of the closing portion 33, and the light emitting unit 29 is fixed by contacting the closing plate 35 and the end of the light emitting unit 29. The closing plate 35 is provided with a wiring portion 36 through which the lead wire 24 that supplies power to the light emitting unit 29 is inserted. The wiring part 36 is provided with a waterproof bushing 37, and the waterproofness of the wiring part 36 is ensured by inserting the lead wire 24 into the waterproof bushing 37. A cylindrical step portion 38 having substantially the same diameter as the flange portion 19 is formed integrally with the closing portion 33 on the rear end side of the base portion 14, and the arm 15 is fixed to the cylindrical step portion 38 with a screw (not shown). .

  The light emitting unit 29 has a light emitting substrate 39, and an LED (light emitting diode) 40 as a light source is mounted on the main surface side of the light emitting substrate 39. On the main surface side of the light emitting substrate 39, a wiring pattern (not shown) and a land for connecting terminals of the LED 40 are formed of copper foil. On the main surface side of the light emitting substrate 39, a plurality of LEDs 40 that emit white light are mounted at predetermined intervals. For example, four LEDs 40 in one row are mounted in two rows (eight in total).

  The light emitting unit 29 has a heat radiating means 41 such as an aluminum heat radiating plate. A light emitting substrate 39 is attached to one side (one surface side) of the heat radiating means 41 so as to be capable of conducting heat by screws or the like not shown. Yes. Heat generated by the LED 40 of the light emitting substrate 39 is radiated into the cylindrical cover 12 by the heat radiating means 41. The light emitting substrate 39 and the heat radiating means 41 may be provided integrally. Moreover, you may use a radiation fin etc. as a thermal radiation means.

  On the other side of the heat radiating means 41, a lighting circuit 30 is provided as a lighting device for lighting the LED 40. The lighting circuit 30 is configured by housing a circuit board (not shown) constituting a constant current circuit and the like inside a metal case 42. The lighting circuit 30 is attached to the heat dissipation means 41 by attaching the case 42 to the other side (other surface side) of the heat dissipation means 41 with screws or the like.

  The light emitting unit 29 is supported by the cylindrical cover 12 by being inserted with the light emitting substrate 39 facing downward in a pair of grooves 32 provided in the accommodation space 28 of the cylindrical cover 12 with the peripheral edge portion of the heat radiation means 41. Is done. Further, the tip of the heat radiating means 41 is also engaged with the groove 32 continuing to the top 16 side. As described above, in the housing space 28 of the cylindrical cover 12, the light projecting unit 20 side and the shade unit 21 side are substantially divided by the heat radiation means 41 of the light emitting unit 29.

  FIG. 3 is a longitudinal sectional view of FIG. As shown in FIG. 3, the light emitting unit 29 is accommodated in the cylindrical cover 12 so as to be positioned below the center position 43 of the cross section orthogonal to the longitudinal direction of the cylindrical cover 12. Thereby, the inner volume of the accommodation space 28A on the shade portion 21 side of the cylindrical cover 12 is divided by the light emitting unit 29 so as to be two to three times larger than the inner volume of the accommodation space 28B on the light projecting portion 20 side. Therefore, the accommodation space 28A on the side of the shade 21 is large in terms of heat capacity, and sufficient convection is performed. Therefore, heat transfer from the heat radiation means 41 and the case 42 of the lighting circuit 30 is performed using the outer surface of the shade 21. Heat can be dissipated satisfactorily by the exchange action. In FIG. 3, the optical sensor 31 does not appear in the cross section, but is shown by a dotted line in order to express the positional relationship in the horizontal direction for reference.

  On the other hand, the accommodating space 28B on the light projecting unit 20 side is relatively narrow, and the distance between the LED 40 mounted on the light emitting substrate 39 of the light emitting unit 29 and the light projecting unit 20 of the cylindrical cover 12 is shortened. Optical characteristics in which the emitted light of the light emitting unit 29 is efficiently irradiated from the light projecting unit 20 in a desired direction can be obtained. The distance between the LED 40 of the light emitting unit 29 and the light projecting unit 20 of the cylindrical cover 12 is such a distance that the light emitted from the light projecting unit 20 does not cause glare and does not cause the crushing of the LED 40 that is the light source. It is desirable to keep

  Further, the side edge portion of the heat radiating means 41 of the light emitting unit 29 is placed and attached to the pair of groove portions 32, and the side edge portion of the heat radiating plate 41 is connected to the outer peripheral surface of the light projecting portion 20 of the cylindrical cover 12. Also, the light projecting unit 20 side and the shade unit 21 side are substantially divided by being arranged so as to project outward. Thereby, the light from the LED 40 of the light emitting unit 29 is prevented from entering the accommodating space 28 </ b> A on the shade portion 21 side of the cylindrical cover 12.

  Further, the photosensor 31 of the present embodiment does not output a predetermined detection result in the emission spectrum of the LED 40 so that the LED 40 does not operate to be extinguished or dimmed by receiving the emitted light of the LED 40 as a light source. Those having characteristics are used. That is, as the optical sensor 31, as shown in FIG. 5, a sensor having sensitivity in the ultraviolet region in the wavelength range of 250 to 400 nm is used. As shown in FIG. 4, the emitted light of the LED 40 mainly emits light in the visible light region in a wavelength range of 400 to 800 nm having a peak wavelength at 465 nm. Therefore, the optical sensor 31 hardly senses the incident light emitted from the LED 40 of the light emitting unit 29. On the other hand, as shown in FIG. 6, the sunlight contains light in the ultraviolet region having a wavelength of 400 nm or less. The optical sensor 31 senses sunlight having a wavelength of 400 nm or less.

  Next, the operation of this embodiment will be described.

  In the daytime, the optical sensor 31 receives sunlight (external light) transmitted through the shade portion 21 of the cylindrical body 18 of the cylindrical cover 12. The optical sensor 31 senses sunlight having a wavelength of 400 nm or less. This sensing signal is input to the lighting circuit 30. The lighting circuit 40 turns off the LED 40 of the light emitting unit 29.

  Then, in the evening, when the sunlight incident on the optical sensor 31 is reduced or no sunlight is incident, the optical sensor 31 does not sense light. The lighting circuit 30 lights all the LEDs 40 of the light emitting unit 29.

  Even in the daytime, when the snow falls, the surroundings become dim and snow accumulates on the shade 21 of the cylindrical body 18 of the cylindrical cover 12, the sunlight is not incident on the optical sensor 31. The lighting circuit 30 lights all the LEDs 40 of the light emitting unit 29.

  Then, when snow is piled up on the tube body 18 of the tube cover 12, leakage light from the LED 40 of the light emitting unit 29 may be reflected by the snow and may enter the optical sensor 31. However, since the optical sensor 31 is not sensitive to the emitted light of the LED 40, it does not sense the light from the LED 40 and does not operate by receiving the emitted light of the LED 40. The optical sensor 31 does not malfunction due to the emitted light of the LED 40, and thus the lighting state of the LED 40 is not undesirably controlled.

  According to the illuminating device 11 of the present embodiment, the light sensor 31 senses the ambient brightness due to sunlight without operating by receiving the radiated light of the LED 40 of the light emitting unit 29. This has the effect of preventing the lighting state of the LED 40 from being undesirably controlled by the emitted light.

  Moreover, since the optical sensor 31 has sensitivity in a wavelength region of a wavelength of 250 to 400 nm, it has an effect that it does not malfunction due to illumination light from another illumination device.

The above-described embodiment of the present invention has been presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Illuminating device, 12 ... Cylindrical cover as apparatus main body, 29 ... Light emission unit, 30 ... Lighting circuit as lighting device, 31 ... Light sensor, 40 ... LED as light source

Claims (2)

A light emitting unit having a light source disposed on one side;
An optical sensor which is arranged on the other side of the light emitting unit and senses ambient brightness without being activated by receiving light emitted from the light source;
A lighting device for turning on the light source in response to sensing of the light sensor;
An apparatus main body for housing the light emitting unit and the optical sensor;
An illumination device comprising:   The illumination device according to claim 1, wherein the photosensor has sensitivity at a wavelength of 260 to 400 nm.