JP2006134707A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lighting fixture with the small number of components, capable of easily obtaining parallel beams and convergent beams from its outgoing beam, uniformly irradiating on a targeted range, and facilitating positional adjustment of a reflector and a positive lens. <P>SOLUTION: In the lighting fixture provided with at least one light source LD having divergence, a curve-surface mirror reflector reflecting light from the light source toward the front, and the plus lens LZ arranged inside the curved-surface mirror reflector RS, the curved-surface mirror reflector is provided with an opening part RO, arranged at a position where the light flux irradiated from the light source can be horizontal or become converged, and an opening at a position extended forward by a given length from the light source, the plus lens is arranged at a given position of the curved-surface mirror reflector by at least one support member LS, and the support member is extended nearly vertically in the irradiation direction of the light flux reflected by the curved-surface mirror reflector, with its tip adhering to the curved-surface mirror reflector. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pocket light, an external illumination system of a moving body, portable and non-portable illumination devices, and an optical system of an illumination device not classified elsewhere, and a light source unit including a light emitting element such as a light emitting diode The present invention relates to a curved reflection reflector, and a lighting apparatus that efficiently emits a light beam by a lens placed in the light emission direction inside the reflector.

  Patent Document 1 discloses a plaque detection light including a light source, a power source, a parabolic reflector that emits uniformly conical light, and a lens that uniformly emits conical light. Disclose.

  Patent Document 2 discloses an optical device that forms, at a front interface of a mold resin that seals a light emitting element, a direct emission region that directly emits light from the light emitting element and a total reflection region that totally reflects light from the light emitting element. Is disclosed. In this optical device, the direct emission region is formed in a convex lens shape. In addition, a light reflecting portion having a concave mirror shape is provided on the back surface of the mold resin. Thus, a part of the light emitted from the light emitting element is emitted forward by receiving a lens action when passing through the direct emission area, and another part of the light emitted from the light emitting element is totally reflected area. Then, the light is reflected by the light reflecting portion and emitted forward from the total reflection region.

Patent Document 3 is composed of a rod-shaped resonator having a light-emitting tube at the tip, and a reflector that has an opening for inserting the resonator and reflects discharge light emitted from the light-emitting tube and radiates it to the outside. A convex lens is arranged in front of the arc tube to emit discharge light, and when the reflector is a paraboloid, the reflector is elliptical so that it is parallel to the optical axis of the convex lens. When it is a surface, an electrodeless discharge lamp is disclosed that is focused on the focal point of the elliptical surface. Further, it is disclosed that a conductor ring for holding the convex lens is provided around the convex lens.
U.S. Pat. No. 4,292,664 JP 2002-94129 A JP 2003-272565 A

  Conventionally, according to the above-mentioned patent documents, a positive lens having a lens diameter smaller than the aperture diameter of the reflector or a lens whose central portion is a positive lens and whose power decreases as it goes to the periphery is attached to the central portion of the reflector. An optical system in which a light beam irradiated on the output side is irradiated as a parallel light beam by the lens, and a light beam irradiated on the side surface from the light source and a light beam irradiated behind the light source are projected as a parallel light beam on the output side by the reflecting mirror It has been known.

  In recent years, high-illuminance type LEDs have been developed as light sources, and pocket lights, mobile external illumination systems, portable and non-portable illumination devices, and the like have been made using this as a light source. Since such an LED has a small amount of heat generation, it is possible to use a heat-sensitive optical material such as a plastic glass material, which is very advantageous for downsizing and cost reduction.

  However, the high illuminance type LED has a very wide divergence angle, and in the positive lens and the reflector configured as described above, the light beam passing between the positive lens and the reflector (hereinafter referred to as “light beam emitted obliquely”). .) Is not emitted as a parallel light beam, and the light beam diffuses.

  In order to prevent this, in Patent Document 2 described above, the reflector is filled with resin so that light emitted in an oblique direction can be efficiently extracted, and the light emitted in the oblique direction is a flat portion around the positive lens. A method is disclosed in which the light is totally reflected and then reflected by a reflector to become parallel rays.

  However, in order to obtain a stable lighting device with a high luminous flux utilization efficiency, the reflector and the positive lens must be made of resin and integrally molded, and the tolerance must be strictly manufactured. It is very difficult to satisfy this. Met. In addition, the movement of the luminous flux inside the lens is complicated, and there is a problem that the design is very difficult.

  For this reason, the present invention does not diffuse the emitted light beam, and can easily obtain a parallel light beam and a condensed light beam, and can uniformly irradiate the target range. An object of the present invention is to provide a lighting apparatus that can be easily adjusted in position and is compact and has few components.

  Therefore, the present invention includes at least one divergent light source, a curved mirror reflector that reflects the light beam diverging from the light source forward, and a positive lens disposed inside the curved mirror reflector. In the lighting fixture, the curved mirror reflector is disposed in a position where the light beam emitted from the light source can be horizontally or converged, and extends forward from the light source by a predetermined length. The positive lens is disposed at a predetermined position in the curved mirror reflector by at least one support member, and the support member reflects the light beam reflected by the curved mirror reflector. It extends in a direction substantially perpendicular to the direction of light emission, and its tip is bonded to the curved mirror reflector.

  In addition, it is desirable that the support member has a narrow surface that is perpendicular to the emission direction of the light beam, and may be formed of a transparent material. Further, the support member may be formed integrally with the positive lens.

  Furthermore, it is desirable that the positive lens is fixed to the curved mirror reflector at a desired position by a fixing means. The fixing means is preferably a mounting groove or a mounting hole formed in the curved mirror reflector. As a result, a mounting groove that defines the lens setting position is formed simultaneously with the formation of the curved mirror reflector, and the tip of the support member molded integrally with the positive lens is bonded to the mounting groove to correct the positive lens. Since it can arrange | position in a position, the manufacture operation | work of a lighting fixture can be made very easy. Furthermore, by securing a certain length of the mounting groove, it is possible to finely adjust the bonding position of the positive lens.

  Further, a cone whose top is the light source and whose bottom is a circle concentric with the exit side opening of the curved mirror reflector is a reference cone, and the positive lens cuts the reference cone almost vertically at a set position of the positive lens. It is desirable to include the surface to do. The reference cone is preferably a concentric circle whose bottom surface has a diameter of 50% or more of the diameter of the exit side opening. Furthermore, the reference cone may be a cone having an apex angle that is 70% of the apex angle of the cone with the light source as the apex and the exit side opening of the curved mirror reflector as the bottom surface.

  Further, when the opening diameter of the exit side opening of the curved mirror reflector is D and the depth of the curved mirror reflector is h, the conditional expression of 0 <D / h ≦ 3.0 (conditional expression 1) is satisfied. When the depth of the curved mirror reflector is h and the distance from the exit opening to the first surface of the positive lens is H, 0.2 ≦ H / h (Condition 2) It is desirable to satisfy the conditional expression The conditional expression 1 is an expression that defines the depth of the curved mirror reflector, and the conditional expression 2 is an expression that defines the position of a positive lens installed in the curved mirror reflector.

  Therefore, according to the present invention, by simultaneously forming the mounting groove that defines the lens setting position when forming the curved mirror reflector, the tip of the support member molded integrally with the positive lens is adhered to the mounting groove. Since the positive lens can be arranged at the correct position, the manufacturing operation of the lighting fixture can be made very easy and the manufacturing error can be reduced, so that the number of work steps and the manufacturing cost can be reduced.

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

  The lighting fixture LT according to the embodiment of the present invention includes at least one divergent light source (specifically, an LED lamp) LD and a curved mirror reflector RS that reflects a light beam emitted from the light source LD. Reflector block LB and a positive lens LZ arranged in the curved mirror reflector RS.

  The reflector block LB is formed of a synthetic resin such as acrylic, and as shown in FIGS. 2A and 2B, a mounting opening LDO for the light source LD is formed on one side surface. An emission opening RO is formed facing the mounting opening LDO. The curved mirror reflector RS is a parabolic surface or an elliptical surface formed with a predetermined curvature provided between the mounting opening LDO and the emission opening RO, and the surface thereof is an aluminum vacuum. It is formed by vapor deposition.

  Further, as shown in FIG. 1, the curved mirror reflector RS has 0 <D / h ≦ 3, where D is the diameter of the exit opening RO, and h is the depth of the curved mirror reflector RS. 0.0 (conditional expression 1) is preferably formed. This is set by a value γ that achieves a predetermined relative illuminance ε from a characteristic line showing a relationship between D / h and relative illuminance RI shown in FIG. In the characteristic line shown in FIG. 4, γ is set to 3.0 or less as a value for achieving a relative illuminance ε of about 0.3 [W] or more. In Example 1 described below, D / h = 1.0 is set.

  Further, the curved mirror reflector RS of the reflector block LB is formed with a mounting groove G to which a tip of a support member LS that supports the positive lens LZ is bonded at a predetermined position (setting position of the positive lens LZ). .

  As shown in FIGS. 3A, 3B, and 3C, the positive lens LZ is integrally formed with the support member LS by an acrylic material in this embodiment. Further, when the support member LS is formed as a member different from the positive lens LZ, the support member LS is formed so that a surface perpendicular to the optical axis of the light source LD is as small as possible, and is emitted from the light source LD. The emission of the light beam reflected by the curved mirror reflector RS is not affected. Further, when the support member LS is formed integrally with the positive lens LZ, the support member LS is formed of a transparent member, so that the influence on the emission of the light beam is small.

  The positive lens LZ is disposed at a position that satisfies a conditional expression of 0.2 ≦ H / h, where H is a distance from the exit-side opening RO to the first surface of the positive lens. .

  Further, the diameter d of the positive lens LZ is based on a conical surface Cn connecting the light source LD and the emission side opening RO, for example, a cone with the apex angle θ of the cone reduced by about 50%, or the emission. When a conical circle whose bottom surface is a concentric circle whose diameter of the side opening RO is reduced by about 50% is used as a reference cone, and the reference cone is cut in parallel to the emission side opening RO at the position where the positive lens LZ is disposed. Of a circular cross section. Specifically, the diameter d of the positive lens LZ is a value that minimizes the diameter of the circular cross section.

  Further, as shown in FIG. 5, the positive lens LZ ′ has a predetermined thickness in the emission direction of the light beam, and the support member LS ′ also has a predetermined thickness in the emission direction. good.

  Tables 1 and 2 show the shape of the positive lens and the shape of the reflector according to the examples of the present invention. In Tables 1 and 2 below, K is a conic coefficient, and A and B are coefficients indicated by Expression 1 below.

  As a positional condition, the light source LD is disposed 2.51 mm from the vertex of the curved mirror reflector RS, and the first surface (light source side) of the positive lens LZ is 11.4 mm from the vertex of the curved mirror reflector RS. Arranged on the exit side. Further, the curvature of the cover of the light source LD is set to 3.29, and the light source is set at the center of curvature of the cover of the light source LD.

  Further, the aspherical surface of the lens is formed by Equation 1 below.

It is a schematic block diagram of the lighting fixture which concerns on embodiment of this invention. (A) is a perspective view of the reflector block which concerns on embodiment of this invention, (b) is the front view. (A) is a perspective view of the positive lens according to the first embodiment of the present invention, (b) is a front view thereof, and (c) is a side view thereof. It is a characteristic diagram which showed the relationship between the ratio of the exit side opening part D and the depth h of the said curved mirror reflector, and relative illuminance. It is a perspective view of the positive lens which concerns on 2nd Embodiment of this invention.

Explanation of symbols

Cn Conical surface G Mounting groove LB Reflector block LD Light source LDO Mounting opening LS, LS 'Support member LT Lighting fixture LZ, LZ' Positive lens RO Output side opening RS Curved mirror reflector

Claims (11)

In a luminaire comprising at least one light source having a divergence, a curved mirror reflector that reflects a light beam emitted from the light source forward, and a positive lens disposed inside the curved mirror reflector,
The curved mirror reflector is disposed in a position where the light beam emitted from the light source can be horizontally or converged inside the curved mirror reflector, and is emitted to a position extending forward by a predetermined length from the light source. Having side openings,
The positive lens is disposed at a predetermined position in the curved mirror reflector by at least one support member;
The illuminating device, wherein the support member extends substantially perpendicularly to an emission direction of a light beam reflected by the curved mirror reflector, and a tip thereof is bonded to the curved mirror reflector.   The lighting apparatus according to claim 1, wherein the support member has a narrowed width of a surface perpendicular to an emission direction of the light beam.   The lighting apparatus according to claim 1, wherein the support member is made of a transparent material.   4. The lighting fixture according to claim 1, wherein the support member is formed integrally with the positive lens.   The lighting apparatus according to claim 2, wherein the positive lens is fixed to a desired position on the curved mirror reflector by a fixing unit.   6. The lighting fixture according to claim 5, wherein the fixing means is a mounting groove formed in the curved mirror reflector.   6. The lighting fixture according to claim 5, wherein the fixing means is a mounting hole formed in the curved mirror reflector.   A cone whose top is the light source and whose bottom is a circle concentric with the exit side opening of the curved mirror reflector is a reference cone, and the positive lens is a surface that cuts the reference cone substantially perpendicularly at a set position of the positive lens. The lighting fixture according to claim 1, wherein the lighting fixture is included.   The lighting fixture according to claim 8, wherein a bottom surface of the reference cone is a concentric circle having a diameter of 50% or more of a diameter of the emission side opening.   The conditional expression of 0 <D / h ≦ 3.0 is satisfied, where D is an opening diameter of an exit side opening of the curved mirror reflector, and h is a depth of the curved mirror reflector. Item 10. The lighting device according to any one of Items 1 to 9.   When the depth of the curved mirror reflector is h and the distance from the exit opening to the first surface of the positive lens is H, the conditional expression of 0.2 ≦ H / h is satisfied. The lighting fixture according to any one of claims 1 to 10.

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