JP2014049251A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture structured such that light emitted from an inside light source and propagating through a cover does not enter a light receiving part receiving outside light.SOLUTION: A translucent cover 2, with which a lens 9 is integrated, is attached to a case while housing a light source 3, an illuminance sensor 7 and the like. A step part 2c is formed at a border part between a central rectangular part 2a and one edge part 2b of the cover 2. The illuminance sensor 7 exists at an edge side further than the step part 2c. Part of the light from the light source 3 (an LED module 3b) is guided to the cover 2 and propagates to the edge part side while repeating total reflection. The propagating light is inflected on the outer surface of the cover 2 and emitted outside without being totally reflected because the condition for the total reflection collapses at the step part 2c. The light propagating through the cover 2 is not made incident on the illuminance sensor 7.

Description

  The present invention relates to an illumination device that detects light from the outside and controls the light emission state of a light source in accordance with the detection result.

  An illuminating device that controls turning on / off of a light source provided in accordance with the state of external brightness has been developed (for example, Patent Document 1). The illumination device of Patent Document 1 has a configuration in which a discharge lamp that illuminates a road surface and a sensor that detects the brightness of the road surface illuminated by the discharge lamp are integrally covered with a translucent glove. Etc. are provided. In this lighting device, when the brightness detected by the sensor is less than the predetermined brightness, the discharge lamp is turned on, and when the brightness is more than the predetermined brightness, the discharge lamp is turned off, Providing appropriate brightness to the road surface according to the environment.

JP 2003-187987 A

  In such an illuminating device, when the light from its own light source (discharge lamp) is received by the sensor, the brightness of the surroundings cannot be accurately detected. It becomes impossible to do. Therefore, in the illumination device described in Patent Document 1, a partition wall is provided to block direct light from the discharge lamp and reflected light from the inner surface of the globe from entering the sensor.

  However, since the partition wall of the lighting device described in Patent Document 1 only blocks light propagating in the air outside the structural member of the lighting device, the partition wall from the discharge lamp (the globe in Patent Document 1) ) Propagated (guided) is incident on the sensor without being blocked by the partition wall, and there is a problem that proper lighting / extinguishing control cannot be performed.

  The present invention has been made in view of such circumstances, and an illuminating device that can suppress light propagating (guiding) from a light source through a component member from being incident on a light receiving unit that receives light from the outside. The purpose is to provide.

  The illumination device according to the present invention includes a light source, a light receiving unit that receives light from the outside, and a light-transmitting cover that covers the light source and the light receiving unit, and according to the amount of light received by the light receiving unit. In the illumination device that controls the light emission state of the light source, the cover has a stepped portion between the light source and the light receiving unit in the cover.

  In the illuminating device of the present invention, the step portion is formed in a part of the cover between the light source and the light receiving portion that receives light from the outside. A part of the light emitted from the light source propagates (guides light) through the inside of the cover while repeating total reflection on the outer and inner surfaces of the cover. The light reaching the step portion of the cover is refracted and emitted to the outside of the cover because the condition of total reflection is broken due to the formation of the step portion. As a result, the light propagated inside the cover does not reach the light receiving unit. Therefore, light from the light source is not incident on the light receiving unit.

  In the illumination device according to the present invention, the light receiving unit has a light receiving surface for receiving light, and the light receiving surface is provided so as to face a direction opposite to a direction in which the light source is located. .

  In the illuminating device of the present invention, the light receiving surface of the light receiving unit is provided on the side opposite to the light source (the side not facing the light source). Therefore, the probability that the light propagating from the light source through the inside of the cover is incident on the light receiving unit is reduced.

  The illumination device according to the present invention is characterized in that a lens that distributes light to the light source is formed integrally with the cover.

  In the illuminating device of the present invention, the lens for distributing light to the light source is formed integrally with the cover, so that the number of parts can be reduced and the size can be reduced.

  The illumination device according to the present invention is characterized in that the step portion is uneven.

  In the illuminating device of the present invention, the step portion is uneven. Therefore, the condition of total reflection is more likely to be lost at the stepped portion, and the incidence of light propagating from the light source through the inside of the cover to the light receiving portion can be more reliably suppressed.

  The illumination device according to the present invention is characterized in that a rough surface treatment is performed on an outer surface of the stepped portion.

  In the illumination device of the present invention, the outer surface of the step portion is roughened. Therefore, the condition of total reflection is more easily broken on the outer surface of the cover at the position where the step portion is formed, and light propagated inside the cover can be more reliably emitted from the outer surface of the cover.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the light which is emitted from a light source and propagates (guides light) inside the translucent cover enters into a light-receiving part.

It is a whole perspective view of the illuminating device of this invention. It is a disassembled perspective view of the illuminating device of this invention. It is sectional drawing which shows the part which accommodated the illumination intensity sensor. It is a top view which shows the other example of an illuminating device. It is a schematic diagram which shows the shape of a cover. It is a schematic diagram which shows the light distribution of an illuminating device.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is an overall perspective view of the lighting device of the present invention, and FIG. 2 is an exploded perspective view of the lighting device of the present invention.

  The illumination device 1 includes a cover 2, a light source 3, a heat sink 4, a packing 5, a case body 6, an illuminance sensor 7, and an attachment body 8. In addition, illustration of the attachment body 8 is abbreviate | omitted in FIG.

  The cover 2 is a plate-shaped member made of a translucent resin such as an acrylic resin or a polycarbonate resin. The cover 2 protects the surface of the light source 3 and the illuminance sensor 7 housed in the space between the case body 6 and the like so that dust or rainwater from the outside air does not adhere.

  The cover 2 has a rectangular portion 2a at the center in the longitudinal direction, and both end portions 2b in the longitudinal direction of the cover 2 connected to the rectangular portion 2a have a semicircular shape in plan view. In the rectangular portion 2a, four lenses 9 in each row are integrally formed at approximately equal intervals over two rows in the longitudinal direction. The size and curvature of the lens 9 are set so that a desired light distribution can be obtained. By forming the lens 9 integrally with the cover 2, the number of parts is reduced.

  Further, a stepped portion 2c is formed at a boundary portion between the one end portion 2b and the rectangular portion 2a. An illuminance sensor 7 to be described later is provided on the end side in the longitudinal direction of the cover 2, that is, at a position facing the one end 2 b further than the step 2 c. The stepped portion 2c is continuously formed from one end to the other end in a direction orthogonal to the longitudinal direction of the cover 2 in plan view. Further, the step 2 c causes the end 2 b facing the illuminance sensor 7 to be positioned on the light emission direction side of the light source 3 relative to the rectangular portion 2 a facing the light source 3.

  The light source 3 of the illuminating device 1 has two long LED substrates 3a and 3a arranged side by side. On each LED substrate 3a, four LED modules 3b are mounted at substantially equal intervals in a row in the longitudinal direction. The mounting position of each LED module 3 b corresponds to the position where each lens 9 is formed on the cover 2. The LED module 3b has, for example, a configuration in which an LED chip that emits blue light is molded with a resin containing a yellow fluorescent material. The phosphor is excited by blue light from the LED chip and excitation by the blue light. Mixed with yellow light generated from the white light.

  The heat sink 4 has a plate shape having substantially the same shape as the cover 2 in plan view, and is made of aluminum or an aluminum alloy. The heat sink 4 is in contact with both LED substrates 3a and has a function of radiating heat associated with light emission of the LED module 3b to the case body 6 side.

  Each LED board 3 a is fixed to the heat sink 4 by screws 11, and both the integrated LED board 3 a and the heat sink 4 are fixed to the case body 6 by screws 12.

  The illuminance sensor 7 as a light receiving unit is a photosensor, and is configured by providing a sensor body 7a on the substrate 7b that receives and detects light from the outside of the lighting device 1. The light receiving surface 7c of the sensor body 7a is provided to face the side opposite to the direction in which the light source 3 is located, in other words, the non-opposing side of the light source 3. The illuminance sensor 7 is fixed to the case body 6 with screws 13.

  A flange 6a is formed in the entire peripheral portion of the case body 6 having substantially the same shape as the cover 2 in plan view, and a flexible flexible member is provided between the flange 6a and the peripheral portion of the cover 2. A packing 5 as a property material is interposed. By inserting the packing 5, the space between the cover 2 and the case body 6 can be sealed, thereby improving the waterproofness of the lighting device 1. The packing 5 is made of, for example, foamed silicone.

  With the light source 3, the heat sink 4, the illuminance sensor 7 and the packing 5 housed in the space between the cover 2 and the case body 6, the cover 2 is fixed to the case body 6 with the two screws 14 and 14, The cover 2 is attached to the case body 6. The lens 9 is positioned with respect to the light source 3 by pressing and deforming the cover 2 with a screw 14 for attaching the cover 2 to the case body 6. At this time, the illuminance sensor 7 is stored in a state of being covered by one end 2 b of the cover 2.

  Furthermore, the attachment body 8 is provided in the case body 6, and the illuminating device 1 is comprised. The lighting device 1 is attached to the utility pole by the attachment body 8.

  In the lighting device 1 configured as described above, when the LED module 3b mounted on the LED substrate 3a is driven by energizing the light source 3, white light emitted from the LED module 3b is integrally formed with the cover 2. The light is emitted to the outside through the lens 9 with a desired light distribution, and the periphery of the illumination device 1 is illuminated with the emitted light.

  The illuminating device 1 is attached to the telephone pole of a road end, and functions as a security light. The illuminance sensor 7 receives light from outside the lighting device 1 and detects the brightness around the lighting device 1. When the detected brightness is less than the predetermined brightness, the light source 3 (LED module 3b) is turned on, and the light from the light source 3 is emitted to the outside through the lens 9 to illuminate the surroundings. On the other hand, when the detected brightness is equal to or higher than the predetermined brightness, the light source 3 (LED module 3b) is turned off and the surroundings are not illuminated. That is, the lighting device 1 is turned off in the daytime and does not illuminate the surroundings, and is turned on at night to illuminate the surroundings.

  Thus, in the configuration in which the light emission state is controlled by turning on / off or dimming the light source 3 according to the intensity (external brightness) of the external light detected by the illuminance sensor 7, In order to increase the accuracy, it is desired that the light from the light source 3 does not enter the illuminance sensor 7.

  Part of the light emitted from the light source 3 (LED module 3b) guides (propagates) the cover 2. Therefore, it is necessary to prevent the light propagating through the cover 2 from entering the illuminance sensor 7. In the lighting device 1 of the present invention, the light propagating through the cover 2 is prevented from entering the illuminance sensor 7 by devising the shape of the cover 2. Hereinafter, this feature will be described in detail.

  FIG. 3 is a cross-sectional view showing a portion housing the illuminance sensor 7. A step 2c is formed at the boundary between the one end 2b of the cover 2 and the rectangular portion 2a. The stepped portion 2 c suppresses light propagating through the cover 2 from entering the illuminance sensor 7.

  The arrows shown in FIG. 3 indicate the path of light propagating through the cover 2. A part of the light from the LED module 3b (light source 3) guides (propagates) the cover 2, but this light repeats total reflection on the outer surface and the inner surface of the rectangular portion 2a at the center of the cover 2. However, the light propagates toward the end 2b of the cover 2 without being emitted from the cover 2 to the outside (A in FIG. 3).

  However, when the propagated light reaches the stepped portion 2c, the condition of total reflection is lost due to the shape change of the cover 2, so that it is not totally reflected and is refracted on the outer surface of the cover 2 before the illuminance sensor 7. The light is emitted to the outside of the cover 2 (lighting device 1) (B in FIG. 3). Therefore, the light propagated through the cover 2 is not incident on the illuminance sensor 7.

  With respect to the shape of the stepped portion 2c, it is preferable that the surface is uneven or the outer surface is roughened. When the stepped portion 2c is uneven, the conditions for total reflection at the stepped portion 2c are more likely to break down, making it easier to extract light to the outside and making light incident on the illuminance sensor 7 from the light source 3 Can be suppressed more reliably. In addition, even when the outer surface of the stepped portion 2c is roughened, the condition of total reflection easily breaks down on the outer surface of the cover 2 at the position where the stepped portion 2c is formed. Incident to the illuminance sensor 7 can be more reliably suppressed. In addition, it is preferable that the inner surface of the cover 2 at the position where the stepped portion 2c is formed is subjected to reflection processing that reflects light such as mirror processing in order to enhance reflection. By applying the reflection processing to the inner surface of the stepped portion 2c, that is, the surface on which the light source 3 and the illuminance sensor 7 are arranged, the total reflection condition is broken at the stepped portion 2c, and the illuminance sensor 7 side of the light emitted from the cover 2 Can be reduced.

  Moreover, it is preferable not to form the level | step-difference part 2c in the vicinity of the illumination intensity sensor 7 so that the illumination intensity sensor 7 may not receive the influence of the optical path change in the level difference part 2c. That is, it is preferable to provide the illuminance sensor 7 far away from the stepped portion 2c.

  In addition, in the portion where the surface shape of the cover 2 changes (the portion where the shape changes from a flat shape to a curved surface like the portion C in FIG. 3), the guided light is likely to leak. It is preferable to provide the illuminance sensor 7 at a distance.

  Since the light receiving surface 7c of the illuminance sensor 7 is provided on the side opposite to the light source 3, the probability that the light from the light source 3 is incident on the illuminance sensor 7 becomes lower.

  In the illumination device 1 of the present invention, the step 2c is formed in the cover 2 and only the shape of the cover 2 is changed, thereby preventing light propagating through the cover 2 from entering the illuminance sensor 7. it can. Therefore, since only the shape of the cover 2 needs to be changed, the incident on the illuminance sensor 7 can be easily suppressed without providing a special member, that is, without increasing the number of components.

  The shape of the stepped portion 2c is not limited to the above-described example, and may be any shape as long as the condition of total reflection is broken and light is refracted to the outside.

  FIG. 4 is a plan view showing another example of a lighting device provided with such a stepped portion. It is a lighting device having a circular shape in plan view, and an illuminance sensor 7 is provided in the vicinity of the center thereof, and a plurality of LED modules 3b are provided in a peripheral portion thereof, and a cover 2 is provided so as to cover them. Yes. In such a configuration, the step 2c is formed in the area of the cover 2 (the hatched area in FIG. 4) between the illuminance sensor 7 and the LED module 3b, so that the cover 2 propagates from the LED module 3b. It is possible to prevent the light (guided) from entering the illuminance sensor 7.

  In the embodiment shown in FIG. 3, the step portion 2 c is provided so that the end 2 b facing the illuminance sensor 7 is located on the light emission direction side of the light from the light source 3 with respect to the rectangular portion 2 a facing the light source 3. However, the step portion 2c may be provided so that the rectangular portion 2a is closer to the light emission direction side of the light source 3 than the end portion 2b.

  By the way, as described above, the cover 2 is attached and fixed to the case body 6 with the screws 14 as attachment members in a state where the light source 3 and the like are housed inside. At this time, since there is a gap between the cover 2 and the case body 6, the flexible cover 2 is symmetrical with a line perpendicular to the line connecting the plurality of screws 14 by tightening with the screws 14. As an axis, it bends in line symmetry.

  In particular, when the packing 5 is interposed between the cover 2 and the flange 6 a of the case body 6, the gap is further increased, so that the amount of deformation of the cover 2 due to pressing when the screw 14 is tightened is further increased. That is, when the packing 5 is interposed between the cover 2 and the case body 6, the cover 5 is pressed and deformed by the cover 2 by tightening the screws 14 so that the cover 2 and the case body 6 are sealed. Therefore, the cover 2 is inevitably pressed and deformed, and bending occurs. Therefore, there is a possibility that the positional relationship between the lens 9 and the light source 3 (LED module 3b) changes due to this bending, and a desired light distribution cannot be obtained.

  Therefore, in the lighting device of the present invention, the shape of the cover 2 before being attached with the screw 14 is different from that of the cover 2 after being attached with the screw 14. FIG. 5 is a schematic diagram showing the shape of the cover 2, and FIGS. 5A and 5B show the shape of the cover 2 before and after attachment, respectively.

  Specifically, when the cover 2 of the manufactured lighting device 1 is intended to be horizontal, the shape of the cover 2 before the fixing with the screw 14 is such that the central part in the longitudinal direction is lighter than the both ends in the longitudinal direction. 3 is formed in a high “C” shape on the light emission direction side (FIG. 5A). If it does so, when it fixes with the bis | screw 14, the cover 2 will deform | transform by fastening with the bis | screw 14, and will become substantially horizontal (FIG. 5B). At this time, how much “C” shape is set in advance may be appropriately set based on the material of the cover 2, the tightening amount with the screw 14, and the like.

  In the above-described example, since the two screws 14 are separated from each other in the longitudinal direction of the cover 2, the shape of the cover 2 before being attached is the same as that of the light source 3 over the width direction at the center in the longitudinal direction of the cover 2. Although it has a “C” shape that is convex in the light emitting direction side, when the two screws 14 are separated in the width direction of the cover 2, the shape of the cover 2 before mounting is changed to that of the cover 2. If the cover 2 is attached with the screw 14, the cover 2 becomes substantially horizontal when it has a “C” shape that is a mountain in the longitudinal direction at the center in the width direction. As described above, by deforming the cover 2 by pressing the cover 2 when the screw 14 is attached, the lens 9 is appropriately positioned with respect to the light source 3 and a desired light distribution can be obtained.

  In the above-described example, the shape of the cover 2 before installation is “C” and the shape of the cover 2 after installation is “horizontal”. 2 is “V-shaped”, the shape of the cover 2 after installation is “horizontal”, the shape of the cover 2 before installation is “C-shaped”, and the shape of the cover 2 after installation is “V-shaped”. It is possible to select a combination of arbitrary shapes of the cover 2 before and after attachment according to the desired light distribution.

  In this way, by taking into account the bending of the cover 2 accompanying the installation, by setting the shape of the cover 2 before the installation, the shape of the cover 2 after the installation can be made a desired shape, A desired light distribution characteristic by the lens 9 integrally formed with the cover 2 can be realized.

  In the lighting device 1 of the present invention, a flexible packing 5 is interposed between the flange 6 a at the peripheral edge of the case body 6 and the peripheral edge of the cover 2. The packing 5 can be used to easily control the light distribution by changing the degree of bending of the cover 2. Hereinafter, this control example will be described.

  FIG. 6 is a schematic diagram showing the light distribution of the lighting device 1. FIGS. 6A and 6B show the light distribution when the packing 5 does not exist and the light distribution when the packing 5 exists, respectively. 6A and 6B, the same parts as those in FIGS.

  When the packing 5 is not present, as shown in FIG. 6A, the cover 2 attached to the case body 6 is horizontal, and the light distribution angle from the lens 9 is 2α. On the other hand, when the packing 5 is present, as shown in FIG. 6B, the amount of deflection of the cover 2 attached to the case body 6 is larger than when the packing 5 is not present (FIG. 6A). As a result, the light distribution angle from the lens 9 is 2β, and the light distribution is narrow (2β <2α).

  Since the cover 2 is bent by the packing 5 provided under the cover 2, the amount of bending of the cover 2 can be adjusted according to the size and hardness of the packing 5 to be used. Therefore, according to the size and hardness of the packing 5. Light distribution can be controlled.

  Conventionally, in order to obtain a desired light distribution, each of the plurality of LED modules has a different light distribution, and the output of those LED modules is controlled to obtain a desired light distribution. For example, in order to obtain an LED module having a light distribution angle of 60 degrees and an LED module having a light distribution angle of 120 degrees and obtaining a light distribution angle of 100 degrees, the output ratio of the former and the latter is set to 1: 2. Therefore, since the desired light distribution is realized by changing the outputs of the plurality of LED modules, the life of the plurality of LED modules varies.

  On the other hand, in the present invention, a plurality of light distributions can be realized by one lens 9 by changing the amount of deflection and the direction (“Ha-shaped” or “V-shaped”) of the cover 2. Can do. Therefore, since all LED modules 3b are used with the same output, there is no variation in lifetime.

  In the above-described embodiment, an example in which the lighting device is used as a crime prevention light that is turned off in the daytime and turned on at night has been described. However, the lighting device of the present invention is not limited to such an example, and may be used for other purposes. For example, the lighting device can be applied to a lighting device that controls the lighting state of a light source so that ambient brightness is constant.

  Moreover, although LED was used as a light source, it is not limited to this, You may use EL (Electro Luminescence) etc.

  Further, the cover is attached to the case body with screws, but the cover may be attached to the case body using an attachment member other than screws, for example, a resin rivet.

  Furthermore, it goes without saying that the present invention can be implemented in variously modified forms within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Cover 2c Step part 3 Light source 3b LED module 5 Packing 6 Case body 7 Illuminance sensor (light-receiving part)
7c Light-receiving surface 9 Lens 14 Screw

Claims (5)

A light source, a light receiving unit that receives light from the outside, and a translucent cover that covers the light source and the light receiving unit are provided, and the light emission state of the light source is controlled according to the amount of light received by the light receiving unit. In the lighting device to
The said cover has a level | step-difference part between the said light source and the said light-receiving part in this cover, The illuminating device characterized by the above-mentioned.   The illumination device according to claim 1, wherein the light receiving unit includes a light receiving surface that receives light, and the light receiving surface is provided to face a side opposite to a direction in which the light source is located. .   The illumination device according to claim 1, wherein a lens that distributes light to the light source is formed integrally with the cover.   The lighting device according to any one of claims 1 to 3, wherein the step portion is uneven.   The illuminating device according to any one of claims 1 to 4, wherein an outer surface of the stepped portion is subjected to a rough surface treatment.

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