JP2010205537A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a lighting device as well as attachment and positioning of a light guide lens, to say nothing of cost reduction aimed at. <P>SOLUTION: The system includes a casing 2 having a substantially cylindrical shape and having an opening 2A at one end, a light source 5 fitted inside the casing 2 and emitting light toward the opening 2A, and a light guide lens 3 fitted at the opening 2A. The casing 2 is equipped with: a lens-contact face 23P provided at a folded part 23 formed by inwardly bending an end part forming the opening 2A; and a positioning protrusion 24 for positioning and fixing the light guide lens in a state in which the light guide lens is insertion-fitted into the lens-contact face 23P so that the light guide lens comes into contact with the latter 23P. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device that facilitates assembly of the illumination device.

  As this type of illumination device, for example, as shown in Patent Literature 1 and Patent Literature 2, a light source, a Fresnel lens that converts light emitted from the light source into, for example, substantially parallel light, a light source, and a Fresnel lens are accommodated. And a lighting device including a casing.

  These illuminating devices are configured to form a recess or groove in a casing by cutting, and fix by fitting a Fresnel lens into the recess or groove.

  However, not only manufacturing cost is required for forming the recess or groove in the casing, but also cutting debris is generated, which is not environmentally preferable.

  In addition, there is a fixing member that fastens and fixes the Fresnel lens to the casing, but it is necessary to provide a fixing member separately from the casing, which not only increases the number of parts but also increases the manufacturing cost. is there.

JP 2005-257993 A JP 2005-259474 A

  Therefore, the present invention has been made to solve the above problems all at once, simplifying the mounting and positioning of an optical element such as a Fresnel lens while simplifying the configuration of the lighting device and reducing the cost. Doing it is the main desired task.

  That is, the illumination device according to the present invention is provided in a casing having a substantially cylindrical shape and having an opening at one end, a light source provided in the casing and emitting light toward the opening, and the opening. An optical element, and the casing is provided in a folded portion formed by folding an end portion forming the opening inward, and a contact surface that contacts the optical element; and And a positioning projection for positioning and fixing the optical element in a state where the optical element is moved toward the contact surface in the casing and the optical element is in contact with the contact surface.

  In such a case, the optical element can be positioned not only by fitting the optical element so as to come into contact with the abutment surface, but at that time, the optical element is fixed by the positioning protrusion, so that the casing is cut. The optical element can be positioned and fixed to the casing without providing a separate fixing member (clamping tool). Therefore, it is possible to easily attach and position the optical element to the casing while simplifying the configuration of the lighting device and reducing the cost.

  As a specific embodiment of the contact surface, it is desirable that the contact surface is a tip surface of the folded portion. If it is this, the contact area to an optical element can be made small, and positioning of an optical element can be performed easily.

  In order to prevent the folded portion from blocking the light emitted from the optical element and to reduce the light amount loss, it is desirable that the folded portion is formed in close contact with the inner surface of the side wall of the casing.

  In order to simplify the positioning protrusion, reduce the number of parts of the lighting device, and reduce the manufacturing cost, it is desirable that the positioning protrusion is configured by indenting the side wall of the casing.

  In order to easily realize the above configuration, it is desirable that the casing is made of sheet metal.

In order to reduce the irradiation unevenness on the irradiation surface as much as possible when combining a plurality of illumination devices, the optical element is preferably a Fresnel lens that converts light from the light source into substantially parallel light. .
Further, it is desirable that a flat plate member is provided so as to be in close contact with the light exit surface of the Fresnel lens. At this time, the flat member is a member having optical transparency, and examples thereof include a Fresnel lens, a cylindrical Fresnel lens, an optical filter, and a protective cover.

  The flat plate member is a cylindrical Fresnel lens that condenses light that has been made substantially parallel light by the Fresnel lens into linear light, and the Fresnel lens and the cylindrical Fresnel lens can sandwich an optical filter. It is desirable to be.

  Here, “providing so as to be in close contact with” means that the Fresnel lens and the cylindrical Fresnel lens are provided so as to be in direct contact with each other, and that another member is interposed between the Fresnel lens and the cylindrical Fresnel lens. It is provided that the Fresnel lens and the cylindrical Fresnel lens are in contact with other members.

  In this case, the lighting device can be reduced in size by providing the Fresnel lens and the cylindrical Fresnel lens (flat plate member) so as to be in close contact with each other. Further, since the optical filter can be sandwiched between the Fresnel lens and the cylindrical Fresnel lens (flat plate member), the optical filter can be fixed to the casing without using a fixing member for fixing the optical filter to the casing separately. Therefore, it is possible to reduce the size while simplifying the configuration of the lighting device.

  According to the present invention configured as described above, it is possible to simplify the mounting and positioning of an optical element such as a Fresnel lens while simplifying the configuration of the lighting device and reducing the cost.

It is a perspective view of the illuminating device which concerns on this embodiment. It is typical sectional drawing of the illuminating device in the embodiment. It is a figure which shows the effect | action of the position adjustment mechanism in the embodiment. It is typical sectional drawing of the illuminating device in the embodiment.

  An embodiment of the present invention will be described below with reference to the drawings.

<Device configuration>
As shown in FIG. 1, the illumination device 100 according to the present embodiment includes a casing 2, a light guide lens (Fresnel lens) 3, a cylindrical Fresnel lens 4, a light source 5, and a position adjustment mechanism 6. Is.

  Hereinafter, each part 2-5 is demonstrated.

  The casing 2 has a substantially rectangular parallelepiped rectangular tube shape having an opening 2A on one surface, and specifically has a cubic hollow box shape with the entire surface open. The casing 2 is made of sheet metal. Further, the inner peripheral surface of the casing 2 is subjected to a light shielding process (for example, a black surface process) for preventing reflection of light.

  Furthermore, the protective cover 7 for protecting the Fresnel lens 3, the cylindrical Fresnel lens 4, and the cylindrical Fresnel lens 4, which are light guide lenses, is disposed in the opening 2 </ b> A of the casing 2 in this order toward the front. Is provided. The protective cover 7 is a transparent thin plate made of an acrylic resin, and is provided in close contact with the cylindrical Fresnel lens 4.

  The Fresnel lens 3 that is a light guide lens is provided in the opening 2A of the casing 2 and converts light emitted from the light source 5 into substantially parallel light. The Fresnel lens 3 is provided in the opening 2A of the casing 2 (the entire front surface of the casing 2), has substantially the same shape as the front view of the opening 2A, and has a rectangular shape when viewed from the optical axis direction. It is. In the present embodiment, the casing 2 has a cubic shape, and the Fresnel lens 3 has a square shape when viewed from the optical axis direction. That is, the illumination device 100 of the present embodiment emits light from the entire surface of the cube. The Fresnel lens 3 is preferably a lightweight and thin resin lens in order to reduce the weight of the entire lighting device 100.

  The cylindrical Fresnel lens 4 is provided in front of the light exit side of the Fresnel lens 3 in the opening 2A of the casing 2, and condenses light that has been made substantially parallel by the Fresnel lens 3 into linear light. is there. Similar to the Fresnel lens 3, the cylindrical Fresnel lens 4 is provided in the opening 2A of the casing 2 (the entire front surface of the casing 2), and has a rectangular shape when viewed from the optical axis direction. In the present embodiment, the casing 2 has a cubic shape, and the cylindrical Fresnel lens 4 has a square shape when viewed from the optical axis direction.

  The cylindrical Fresnel lens 4 is provided so as to be in close contact with the Fresnel lens 3 in the opening 2 </ b> A of the casing 2. Thus, by providing the Fresnel lens 3 and the cylindrical Fresnel lens 4 in close contact with each other, the lighting device can be reduced in size, and an optical filter (for example, a polarizing filter) is provided between the Fresnel lens 3 and the cylindrical Fresnel lens 4. ), The optical filter can be sandwiched and fixed to the casing 2 by the Fresnel lens 3 and the cylindrical Fresnel lens 4 without using a fixing member for fixing the optical filter to the casing 2 separately. This also makes it possible to reduce the size of the lighting device 100 while simplifying the configuration.

  The light source 5 is provided in the casing 2 and emits light toward the Fresnel lens 3. Specifically, the light source 5 is provided in the vicinity of the focal position of the Fresnel lens 3. The light source 5 of this embodiment is a monochromatic or white LED. Note that a plurality of LEDs 5 may be provided, or only a single LED 5 may be provided.

  The position adjusting mechanism 6 is provided with a gripping portion 64 outside the casing 2 and adjusts the position of the LED 5 by operating the gripping portion 64. The configuration includes a light source holding part 61, an operation connecting part 62, and a support part 63.

  The light source holding unit 61 holds the LED 5 and is disposed in the casing 2. In the present embodiment, the light source holding unit 61 further functions as a heat radiating unit that radiates heat generated by the LED 5. The light source holding part 61 may be formed of a highly heat conductive material such as aluminum, or may be provided with a heat radiating fin, in order to exhibit a function as a heat radiating part.

  One end of the operation connecting portion 62 is connected to the light source holding portion 61 and a grip portion 64 is provided at the other end. The operation connecting portion 62 has a rod shape that is inserted into the through hole 21 h provided in the rear wall 21 of the casing 2. Note that a heat radiating mechanism such as a heat radiating fin may be provided in the operation connecting portion 62.

  The grip portion 64 has a substantially spherical shape provided at the outer end portion of the casing 2 of the operation connecting portion 62. Further, the grip portion 64 is colored in the same color as the light emission color of the LED 5. Thereby, at the time of an assembly, the color of the illumination light of each illuminating device 100 can be grasped | ascertained visually easily and the workability | operativity of an assembly can be improved.

  The support part 63 is provided between the casing 2 and the operation connecting part 62 and supports the operation connecting part 62 so that the light source holding part 61 moves when the grip part 64 is operated. The support portion 63 of the present embodiment is provided in the vicinity of the periphery of the through hole 21 provided in the rear wall of the casing 2, and the operation connecting portion 62 is fixed to the rear wall of the casing 2, and the grip portion 64 is operated. The operation connecting portion 62 is slidably supported, and the support portion 63 is rotatably supported around the rotation center. It is conceivable that the support portion 63 is constituted by a spherical plain bearing (for example, a pillow ball). Moreover, the support part 63 may be comprised with the set screw which press-fixes the operation connection part 62 from the circumferential direction, and may be comprised with an elastic member.

  Specifically, as shown in FIG. 3, by pushing the grip portion 64 forward, the operation connecting portion 62 slides on the support portion 63, and the LED 5 can be brought closer to the Fresnel lens 3. Thereby, the light emitted from the Fresnel lens 3 becomes light that is slightly expanded more than substantially parallel light. Further, as shown in FIG. 4, by moving the grip portion 64 in the vertical direction, the operation connecting portion 62 rotates around the support portion 63, and the LED 5 can be moved in the vertical direction. Thereby, the irradiation direction of the light emitted from the Fresnel lens 3 can be changed. In addition, the support part 63 of this embodiment also has a function which prevents the light from LED5 from leaking from the through-hole 21. FIG.

<About positioning and fixing structure>
Thus, as shown in the partially enlarged view of FIG. 2, the casing 2 of the lighting device according to the present embodiment is provided in a folded portion 23 formed by folding the end portion of the side wall 22 forming the opening 2 </ b> A inward. A lens contact surface 23P, and a positioning protrusion 24 for positioning and fixing the Fresnel lens 3 in a state where the Fresnel lens 3 is fitted toward the lens contact surface 23P and the Fresnel lens 3 is in contact with the lens contact surface 23P. Have

  The folded portion 23 of the present embodiment is formed by folding the casing side wall 22 approximately 180 degrees, and the side surface of the folded portion 23 is formed so as to be in close contact with the inner surface of the casing side wall 22. Further, the folded portion 23 is formed over the entire side wall 22 of the casing 2.

  By configuring the folded portion 23 in this way, the lens contact surface 23 </ b> P is configured by the tip surface of the folded portion 23.

  Moreover, the positioning protrusion 24 is comprised by denting the side wall 22 of the casing 2 inside by press work. Specifically, a plurality of side walls 22 of the casing 2 are provided. The positioning projection 24 is provided so as to be separated from the front end surface (lens contact surface 23P) of the folded portion 23 by a thickness of the Fresnel lens 3 to be fixed. As a result, the Fresnel lens 3 fixed by the positioning protrusion 24 receives a pressing force from the positioning protrusion 24 toward the lens contact surface 23P while being in contact with the lens contact surface 23P.

  Finally, a method for attaching the Fresnel lens 3, the cylindrical Fresnel lens 4 and the protective cover 7 in the illumination device 100 configured as described above will be described.

  First, the casing 2 is formed using sheet metal. At this time, the folded portion 23 is formed by folding the end portion that forms the opening 2 </ b> A by pressing, and the positioning protrusion 24 is formed.

  Then, after the Fresnel lens 3 is accommodated in the casing 2, the inside of the casing 2 is moved from the positioning projection 24 side to the lens contact surface 23P side. Then, the Fresnel lens 3 moves over the positioning protrusion 24 and immediately contacts the lens contact surface 23P when the positioning protrusion 24 is exceeded. As a result, the Fresnel lens 3 is positioned and fixed. Next, the cylindrical Fresnel lens 4 is fitted into the opening 2 </ b> A formed by the folded portion 23 from the front side of the light emission side of the Fresnel lens 3, and is fixed in a state in contact with the Fresnel lens 3. Further, the protective cover 7 is fitted from the front side of the light exit side of the cylindrical Fresnel lens 4 into the opening 2 </ b> A formed by the folded-back portion 23, and is fixed in contact with the cylindrical Fresnel lens 4.

  <Effects of the present embodiment> According to the illumination device 100 according to the present embodiment configured as described above, the Fresnel lens 3 can be positioned as much as possible by simply fitting the Fresnel lens 3 into contact with the lens contact surface 23P. Instead, since it is fixed by the positioning protrusion 24, the Fresnel lens 3 can be positioned and fixed to the casing 2 without cutting the casing 2 or without providing a separate fixing member (clamping tool). it can. Therefore, it is possible to easily attach and position the Fresnel lens 3 to the casing 2 while simplifying the configuration of the lighting device 100 and reducing the cost.

<Other modified embodiments>
The present invention is not limited to the above embodiment. In the following description, the same reference numerals are given to members corresponding to the above-described embodiment.

  For example, in the above-described embodiment, only the Fresnel lens is sandwiched between the lens contact surface and the positioning projection. Filter or polarizing filter) and protective cover, Fresnel lens and resin lens (cylindrical Fresnel lens or cylindrical Fresnel lens), Fresnel lens and optical filter and resin lens, Fresnel lens, optical filter, resin lens and protective cover, Fresnel lens and optical filter In addition, the resin lens, the optical filter, and the protective cover may be sandwiched. In addition, when clamping each said member, let the distance of a lens contact surface and a positioning protrusion match | combine the thickness of each member. Further, an AR coating may be applied to the flat surface of the lens or the protective plate, or an antireflection treatment may be performed by providing an AR film.

  In addition, the lens contact surface of the embodiment is configured by the tip surface of the folded portion. However, when the folded portion is formed by bending the folded portion substantially at a right angle with respect to the side wall of the casing, You may comprise by a side surface.

  Furthermore, the positioning protrusion of the above embodiment is configured by denting the side wall of the casing inward by press working. However, by attaching a member constituting the positioning protrusion separately to the inner surface of the casing side wall, It may be configured.

  In addition, the casing according to the above embodiment has a rectangular tube shape such as a cubic shape whose entire surface is open, but may have a cylindrical shape.

  In addition, some or all of the above-described embodiments and modified embodiments may be combined as appropriate, and the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .

DESCRIPTION OF SYMBOLS 100 ... Illuminating device 2 ... Casing 22 ... Side wall 2A of casing ... Opening 3 ... Fresnel lens (light guide lens)
5 ... Light source 23 ... Folded part 23P ... Lens contact surface (tip surface of the folded part)
24 ... Positioning protrusion

Claims (9)

A casing having a substantially cylindrical shape and having an opening at one end, a light source provided in the casing and emitting light toward the opening, and an optical element provided in the opening,
The casing is
A contact surface that is provided in a folded portion formed by folding an end portion that forms the opening inward, and that abuts on the optical element;
And a positioning protrusion for positioning and fixing the optical element in a state where the optical element is moved toward the contact surface in the casing and the optical element is in contact with the contact surface.   The lighting device according to claim 1, wherein the contact surface is a front end surface of the folded portion.   The lighting device according to claim 1, wherein the folded portion is formed in close contact with the inner surface of the side wall of the casing.   The lighting device according to claim 1, 2, or 3, wherein the positioning protrusion is configured by denting a side wall of the casing inward.   The lighting device according to claim 1, wherein the casing is made of sheet metal.   The lighting device according to claim 1, wherein the optical element is a Fresnel lens that converts light from the light source into substantially parallel light.   The lighting device according to claim 6, wherein a flat plate-like member is provided so as to be in close contact with the light exit surface of the Fresnel lens. The flat plate member is a cylindrical Fresnel lens that condenses light that has been made substantially parallel light by the Fresnel lens into linear light,
The lighting device according to claim 7, wherein the Fresnel lens and the cylindrical Fresnel lens can sandwich an optical filter.   The illumination device according to claim 8, wherein an optical filter is sandwiched between the Fresnel lens and the cylindrical Fresnel lens.