JP3187902U - Lighting device - Google Patents

Abstract

An illumination device having a simple structure, excellent durability, and capable of controlling the orientation of light is provided.
An illumination apparatus 1A according to the present invention includes a light source unit 2 that emits light, a planar lens 3 that emits the emitted light, and a housing 4 that supports the light source unit 2 and the planar lens 3. . The planar lens 3 forms a prism on at least one main surface. This prism includes a refractive prism having a refractive action and a reflective prism having a reflective action. The flat lens 3 is provided in the housing 4 so that it can be attached and detached and the front surface and the back surface can be reversed. The orientation distribution of the light emitted from the light source unit 2 can be changed by inverting the front and back surfaces of the flat lens 3 with respect to the housing 4.
[Selection] Figure 1

Description

  The present invention relates to a lighting device.

  Conventionally, as an illuminating device in which the orientation of light incident from a light source can be controlled, for example, in Patent Document 1, a plurality of LEDs are arranged in a straight line, and a plurality of frames arranged in a radial pattern as a whole are in a planar state. An illumination device is disclosed that can adjust the directivity of light by being configured to be mechanically deformable so as to be in a concave state or a convex state.

JP 2003-229014 A

  However, in the device described in Patent Document 1, since it is necessary to mechanically deform each frame, the structure becomes complicated and there is a concern about the durability of the lighting device.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an illumination device that has a simple structure, is excellent in durability, and can control the orientation of light.

(Mode of invention)
The following aspects of the present invention exemplify aspects of the present invention, and are described in sections to facilitate understanding of the various components of the present invention. Each of the following sections does not limit the technical scope of the present invention, and replaces, deletes, or further removes some of the components of each section while taking into account the best mode for carrying out the present invention. An aspect to which other components are added can also be an aspect of the present invention.

(1) a light source unit that emits light toward the front;
A plurality of prisms formed on at least one main surface, and arranged in front of the light source unit, thereby controlling an alignment of light emitted from the light source unit; and
A housing that holds the orientation control member,
The plurality of prisms include a reflecting prism configured to reflect light incident from the light source unit on an inclined surface and to be emitted from an emission surface of the orientation control member,
The said housing | casing is an illuminating device comprised so that the orientation control member can be attached or detached and the surface and the back surface of the orientation control member can be reversed (Claim 1).

  In the illuminating device according to this section, the plurality of prisms formed on at least one main surface of the orientation control member include a reflecting prism, and the surface and the back surface of the orientation control member are reversed with respect to the housing, thereby providing a light source. This changes the orientation distribution of the light emitted from the part. Moreover, a housing | casing reverse | inverts the surface and back surface of an orientation control member easily by comprising an orientation control member so that attachment or detachment is possible.

(2) In the above item (1), the orientation control member is formed in a circular shape,
The plurality of prisms are concentric circles centered on the optical axis of the light source unit (claim 2).

  In the illumination device according to this section, the plurality of prisms are formed concentrically around the optical axis of the light source unit, so that the light emitted from the light source unit has excellent rotational symmetry about the optical axis of the light source unit. Illuminance distribution.

(3) In the above items (1) and (2), the housing includes a first support part on which a step part for arranging an outer peripheral part of the orientation control part is formed;
A lighting device comprising: a second support portion that sandwiches the outer peripheral portion of the orientation control member together with the first support portion (Claim 3).

  In the illuminating device according to this aspect, the outer peripheral portion of the orientation control member is disposed at the step portion of the first support portion, and the second support portion is assembled to the first support portion, thereby securely holding the orientation control member. Can do.

(4) In the above items (1) to (3), the reflecting prism is formed on the outer peripheral side of the orientation control unit,
A refraction prism configured to refract light incident from the light source unit on an inclined surface and to be emitted from the exit surface of the orientation control member is formed on the inner peripheral side of the region where the reflection prism is formed. A lighting device (claim 4).

  In the illuminating device according to this section, the refractive prism is formed on the inner peripheral side of the region where the reflecting prism is formed, so that the light incident from the light source unit is refracted by the inclined surface, and the orientation control member has a predetermined direction. It emits efficiently.

  The present invention configured as described above can provide an illumination device that has a simple structure, is excellent in durability, and can control the orientation of light.

It is a schematic sectional drawing of the illuminating device which concerns on 1st Embodiment of this invention. It is the elements on larger scale of the plane lens of the state where the prism was arrange | positioned facing the light source part. It is the elements on larger scale of the plane lens in the state where the prism was arranged opposite to the light source part. It is a graph which shows test evaluation of the planar lens which concerns on this invention. It is a schematic sectional drawing of the illuminating device which concerns on 2nd Embodiment of this invention.

Hereinafter, the structure of the illuminating device according to the first embodiment of the present invention will be described in detail based on FIG. 1, FIG. 2, and FIG.
The lighting device 1A of the present invention is a lighting device that can change the orientation (irradiation range) of light. As shown in FIG. 1, the illuminating device 1A includes a light source unit 2 that emits light, a planar lens 3 (orientation control member) that emits light by controlling the orientation of light emitted from the light source unit 2, and a light source unit 2. And a housing 4 that supports the planar lens 3.

  The light source unit 2 includes an LED 6 and a substrate 7 on which the LED 6 is mounted. The LED 6 is a white LED that emits white light by combining a blue LED chip and a yellow phosphor. The board | substrate 7 is substantially disk shape, and has provided LED6 on the upper surface. Further, the substrate 7 is disposed on the first step portion 24 of the first opening 22 of the first support portion 18 constituting the housing 4.

  The planar lens 3 has a substantially disk shape and is formed using a transparent resin such as an acrylic resin or a polycarbonate resin. The planar lens 3 has a plurality of prisms 9 formed on one main surface, and the plurality of prisms 9 are concentrically centered on the optical axis of the LED 6 of the light source unit 2 (see the broken line arrow O in FIGS. 2 and 3). Is formed. Further, the planar lens 3 is detachably and reversibly disposed on the second step portion 25 of the second opening 23 of the first support portion 18 constituting the housing 4. In order to arrange the planar lens 3 on the second step portion 25, the outer peripheral side of the main surface where a plurality of prisms are appropriately formed is formed as a flat surface. Below, each component is demonstrated in detail.

  The plurality of prisms 9 includes a plurality of refraction prisms 10 formed in an inner peripheral region of the planar lens 3 and a plurality of reflections formed in an outer peripheral side region (outside the plurality of refraction prisms 10) of the planar lens 3. And a prism 11. The plurality of refraction prisms 10 and the plurality of reflection prisms 11 are formed so that the focal lengths of all the prisms are the same.

  The plurality of refraction prisms 10 are prisms having a refractive action, and when the planar lens 3 is disposed so that the main surface (prism surface) on which the plurality of prisms 9 are formed faces the LED 6 (see FIG. 2), the LED 6 The light emitted from the light enters the inclined surface 14 (surface facing away from the optical axis O of the LED 6) without passing through the vertical surface 13 (surface facing the optical axis O of the LED 6) of the refraction prism 10 and is refracted. To do. Then, the light is emitted (advanced) in a predetermined direction (in the illustrated example, the vertical direction (optical axis direction)) from the emission surface of the flat lens 3 (a flat surface that is the main surface opposite to the prism surface) (FIG. 2). (See two-dot chain line P). On the other hand, when the flat lens 3 is arranged so that the front surface and the back surface of the flat lens 3 are reversed and the flat surface faces the LED 6 (when light emitted from the LED 6 is incident on the flat surface, see FIG. 3), the LED 6 The light emitted from the light enters the inclined surface 14 without being incident on the vertical surface 13 and is refracted. And it radiates | emits from the output surface (prism surface) of the plane lens 3 in the substantially the same direction as the case where the plane lens 3 is arrange | positioned so that a prism surface may oppose LED6 (refer double-dot chain line P of FIG. 3).

  The plurality of reflecting prisms 11 are reflecting prisms. When the planar lens 3 is arranged so that the prism surface faces the LED 6 (see FIG. 2), the light emitted from the LED 6 is incident on the incident surface 15 (LED 6 Is incident on the prism from the surface facing the optical axis O and reflected by the inclined surface 16 (the surface facing away from the optical axis O of the LED 6). Then, the light exits from the exit surface of the planar lens 3 in a predetermined direction (vertical direction in the illustrated example) (see a two-dot chain line Q in FIG. 2). On the other hand, when the flat lens 3 is arranged so that the front surface and the back surface of the flat lens 3 are reversed and the flat surface faces the LED 6 (see FIG. 3), the light emitted from the LED 6 passes through the incident surface 15. Instead, the light is incident and refracted at an angle close to perpendicular to the inclined surface 16 (an angle smaller than the critical angle). And it radiate | emits from the output surface (prism surface) of the plane lens 3 in the direction different from the case where the plane lens 3 is arrange | positioned so that a prism surface may oppose LED6 (refer the dashed-two dotted line Q of FIG. 3).

  That is, when the prism 9 formed on the planar lens 3 is the refractive prism 10, the light emission direction (orientation distribution) is basically unchanged even if the front and back surfaces of the planar lens 3 are reversed. When the prism 9 formed on the planar lens 3 is the reflecting prism 11, the light emission direction changes. The inclined surface 16 of the reflecting prism 11 has a larger inclination angle with respect to the main surface of the planar lens 3 than the inclined surface 14 of the refractive prism 10.

  The housing 4 includes the first support 18 on which the light source unit 2 and the planar lens 3 are disposed as described above, and the second support 19 that sandwiches the planar lens 3 together with the first support 18. Yes. The 1st support part 18 is a flat cylinder shape which has the space 20 penetrated in the front-back direction in the center part, and is formed with resin which reflects light, such as white resin. The first support portion 18 has a male screw 21 formed on the outer peripheral portion on the top side (upper surface in FIG. 1), and a first opening 22 for placing the light source unit 2 on the bottom side (lower surface in FIG. 1). A second opening 23 for forming the planar lens 3 is formed on the top side. The first opening 22 is formed with a first step portion 24 that contacts the outer peripheral portion of the substrate 7 of the light source unit 2, and the second step portion 25 that contacts the outer peripheral portion of the planar lens 3 is formed in the second opening 23. Is formed. The first opening 22 and the second opening 23 are connected by an inclined surface 26 that expands toward the front. The inclined surface 26 has a function as a reflecting surface that reflects the light emitted from the light source unit 2 toward the flat lens 3.

  The second support portion 19 has a low cylindrical shape, and includes a wall portion 28 in which an internal thread 27 is formed on the inner peripheral portion, and a ring-shaped protruding portion 29 extending inward from the upper end of the wall portion 28. Yes. The wall portion 28 has an inner diameter that is substantially the same as or slightly larger than the outer diameter of the first support portion 18. The wall portion 28 is disposed so as to cover the outer peripheral portion at the upper end of the first support portion 18 when the second support portion 19 is assembled to the first support portion 18. That is, the first support portion 18 and the second support portion 19 are detachably fixed to each other when the male screw 21 of the first support portion 18 and the female screw 27 of the second support portion 19 are screwed together. The overhang portion 29 has a circular opening 30 formed inside. Further, when the second support portion 19 is assembled to the first support portion 18, the overhang portion 29 is between the second step portion 25 of the second opening portion 23 of the first support portion 19 and the planar lens 3. Clamp the outer periphery. The opening 30 exposes the exit surface excluding the outer periphery of the planar lens 3, and emits illumination light from the opening 30 through the exit surface of the planar lens 3.

  Note that, as a detachable fixing means between the first support portion 18 and the second support portion 19, the male screw 21 of the first support portion 18 and the female screw 27 of the second support portion 19 are screwed and fixed. It can also be fixed using a fixing means provided with a locking mechanism such as a hook.

  Next, an evaluation test of the illumination device 1 including the planar lens 3 on which the prism 9 is formed will be described with reference to FIG. In the evaluation test, when light is incident from the main surface (prism surface) side on which the prism 9 is formed, the three illuminance angles differ within a range of 13 ° to 39 ° (Nо.1, Nо.2 and Nо. Evaluation was performed using the planar lens 3 of 3). Here, the specific illumination angle of each sample is Nо. 1 is 13.0 °, Nо. 2 is 24.5 °, Nо. 3 is 39.0 °. In the evaluation test, light is incident on the main surface (front surface, prism surface) on which the prism 9 is formed and on the opposite main surface (back surface, flat surface) on which the prism 9 is formed. The incident state was evaluated. Nо. 1, Nо. 2 and Nо. 3 has different central illuminances corresponding to the illuminance angles. The illuminance angle can be adjusted by changing the focal length of each prism and the distance between the light source unit 2 and the flat lens 3.

  In the evaluation results of the three samples, referring to FIG. In the case of 1, the illuminance angle was expanded about twice by using the surface of the flat lens 3 with the front surface (light incident from the prism surface) and the rear surface (light output from the prism surface) reversed. Nо. In the case of 2, it was found that there was no change in characteristics other than the central illuminance. Nо. In the case of 3, it was found that the illuminance angle becomes narrower when the front and back surfaces of the flat lens 3 are reversed.

  As a result, the orientation of the light emitted from the illuminating device 1 can be controlled by using the planar lens 3 having the reflecting prism 11 so that the front and back surfaces of the planar lens 3 are reversed and attached to the illuminating device 1. It becomes. Also, Nо. 2, when the light exits from the prism 9 side, the light is not collected and the central illuminance decreases, but the chromaticity difference (Δx, Δy) does not change, so that it has no problem in appearance and functions as an illumination lens. Can do. In the plane lens 3, a light scattering element is formed on the main surface opposite to the main surface on which the prism 9 is formed in order to reduce color unevenness based on the structure of the white LED. Even if the front and back surfaces are reversed, the color unevenness hardly changes.

  According to the illuminating device 1 of the first embodiment of the present invention having the above-described configuration, the reflecting prism 11 is included in the plurality of prisms 9 formed on at least one main surface of the planar lens 3, and the planar surface with respect to the housing 4 is flat. By reversing the front and back surfaces of the lens 3, the orientation distribution of the light emitted from the light source unit 2 can be changed. Further, by forming the plurality of prisms 9 concentrically with the optical axis of the light source unit 2 as the center, the light emitted from the light source unit 2 has an illuminance with excellent rotational symmetry about the optical axis of the light source unit 2 Distribution. The housing 4 can easily reverse the front surface and the back surface of the flat lens 3 by configuring the flat lens 3 to be detachable. Further, the outer peripheral portion of the planar lens 3 is arranged on the first step portion 24 of the first support portion 18, and the second support portion 19 is assembled to the first support portion 18, so that the planar lens 3 is securely clamped. Can do.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same reference numerals are used for the same parts with respect to the first embodiment, and only different parts will be described in detail.

  As shown in FIG. 5, in the illuminating device 1B according to the second embodiment, the planar lens 33 is formed in a rectangular flat plate shape, and a plurality of prisms (not shown) are linearly formed on at least one main surface (so-called linear). Prism) is formed. In the illustrated example, the plurality of prisms extend in the direction perpendicular to the paper surface.

  The housing 34 is formed in a rectangular parallelepiped shape having a space 35 at the center corresponding to the outer diameter shape of the planar lens 33. The space 35 is formed so as to penetrate in the front-rear direction (optical axis direction) and in a direction orthogonal to the front-rear direction (optical axis direction). The housing 34 is formed with a pair of grooves 36, 36 for inserting and holding both ends of the flat lens 33 slightly below the second opening 23.

  Further, in the lighting device 1B, both ends of the casing 34 in the direction perpendicular to the plane of the paper surface in order to restrict the movement of the planar lens 33 with respect to the direction in which the prism extends and prevent foreign matter such as dust and dirt from entering the casing 34. A pair of end plates (not shown) are provided to close the door.

  According to the lighting device 1B according to the second embodiment, in addition to the same functions and effects as those of the first embodiment, the pair of groove portions 36 and 36 are formed in the housing 34, so that the flat lens 33 is detachably held. And the front and back surfaces of the flat lens 33 can be easily reversed. Further, since the second support portion 19 used in the first embodiment is not necessary, the structure is simple and the cost can be reduced.

  In the above embodiment, the plurality of refraction prisms 10 are formed in the inner peripheral region of the flat lenses 3 and 33, and the plurality of reflection prisms 11 are formed in the outer peripheral region of the flat lenses 3 and 33. Instead of providing the plurality of refraction prisms 10, only the plurality of reflection prisms 11 may be formed. In this case, a plurality of reflecting prisms 11 may be formed in the inner peripheral region of the planar lenses 3 and 33.

  Further, although the plurality of prisms 9 are formed on one main surface of the planar lenses 3 and 33, a plurality of prisms 9 may be formed on both surfaces. The focal length of each prism 9 does not need to be constant, and the focal length may be appropriately changed for each prism 9.

  Furthermore, in the above embodiment, when the flat lenses 3 and 33 are attached to the housings 2 and 34, not only the front and back surfaces of the flat lenses 3 and 33 are reversed, but also between the light source unit 2 and the flat lenses 3 and 33. The distance may be changed. Thereby, the orientation of light can be changed in a wider range.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Illuminating device, 2 ... Light source part, 3 ... Plane lens (orientation control member), 4 ... Housing | casing, 9 ... Prism, 11 ... Reflection prism

Claims (4)

A light source unit that emits light toward the front;
A plurality of prisms formed on at least one main surface, and arranged in front of the light source unit, thereby controlling an alignment of light emitted from the light source unit; and
A housing that holds the orientation control member,
The plurality of prisms include a reflecting prism configured to reflect light incident from the light source unit on an inclined surface and to be emitted from an emission surface of the orientation control member,
The said housing | casing is comprised so that the orientation control member can be attached or detached, and the surface and the back surface of the orientation control member can be reversed. The orientation control member is formed in a circular shape,
The lighting device according to claim 1, wherein the plurality of prisms are formed concentrically around the optical axis of the light source unit. The housing includes a first support portion on which a step portion for arranging an outer peripheral portion of the orientation control portion is formed,
The lighting device according to claim 1, further comprising: a second support portion that sandwiches an outer peripheral portion of the orientation control member together with the first support portion. The reflecting prism is formed on the outer peripheral side of the orientation control unit,
A refraction prism configured to refract light incident from the light source unit on an inclined surface and to be emitted from the exit surface of the orientation control member is formed on the inner peripheral side of the region where the reflection prism is formed. The lighting device according to any one of claims 1 to 3, wherein the lighting device is provided.

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