JP5895191B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture that controls light distribution by arranging a Fresnel lens in front of a light source.

Conventionally, a Fresnel lens arranged in front of a light source in a spotlight used in a stage or a studio is known (for example, see Patent Document 1).
As shown in FIG. 6, the Fresnel lens 100 described in Patent Document 1 is arranged in front of the irradiation direction of the lamp 101, which is a light source (upward in FIG. 6).
Here, the lamp 101 is disposed in a lamp body (not shown) whose one surface is open, and the Fresnel lens 100 is disposed so as to close the opening portion of the lamp body.

The Fresnel lens 100 includes a central lens portion 103 having a plano-convex lens shape with an optical axis 102 passing through the center thereof, and a plurality of concentric circles provided on the outer side of the central lens portion 103 with respect to the optical axis 102 and having a peak portion 104 on the front surface side. It is comprised with the ring-shaped lens part 105. FIG.
The central lens portion 103 and the plurality of annular lens portions 105 are integrally formed.

The crest 104 of each ring-shaped lens unit 105 has a rising surface 104A formed by a side surface on the optical axis 102 side, and an effective surface 104B formed by a convex curved surface intersecting the rising surface 104A.
In the Fresnel lens 100, the rising surface 104A of the peak portion 104 and the rear surface 106 of the Fresnel lens 100 are subjected to diffusion processing such as embossing.

Japanese Patent Laid-Open No. 2004-12808 (FIG. 1)

  However, in the conventional Fresnel lens 100 as described above, the rising surface 104A and the rear surface 106 are subjected to diffusion processing to control the light distribution in the optical axis direction, but this is sufficient in the direction orthogonal to the optical axis. There was a problem that light distribution control was not performed.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a luminaire that can control luminance and glare in a direction orthogonal to the optical axis.

The luminaire of the present invention has an LED light source and a Fresnel lens provided in front of the LED light source in the irradiation direction, and performs light diffusion processing on an elevation surface of the Fresnel lens and transmits the outer peripheral edge of the Fresnel lens. While providing a light rising wall along the irradiation direction and providing an uneven portion on the outer peripheral surface of the rising wall, the rising wall protrudes on the incident side and the output side of the Fresnel lens, the uneven portion The cross section is substantially triangular, and the surface on the irradiation direction side is substantially orthogonal to the optical axis, and the outside thereof is a convex curved surface .

  Furthermore, in the lighting fixture of the present invention, the lens is a hybrid lens.

  The present invention performs a light diffusion process on the rising surface of the Fresnel lens provided in front of the LED light source in the irradiation direction, and provides a translucent rising wall along the irradiation direction on the outer peripheral edge of the Fresnel lens. Since the concavo-convex part is provided on the outer peripheral surface, not only the irradiation light in the optical axis direction but also the brightness and glare in the direction orthogonal to the optical axis can be controlled, and the liveliness can be produced while suppressing glare. The lighting fixture which has the effect of being can be provided.

The side view of the lighting fixture of embodiment which concerns on this invention Cross section of the lamp Lens cross section Enlarged cross-sectional view of the fresnel lens peak and uneven wall (A) is a perspective view which shows another example of a standing wall, (B) is the front view seen from B direction in (A) Cross section of a conventional Fresnel lens

Hereinafter, the lighting fixture of embodiment which concerns on this invention is demonstrated using drawing.
As shown in FIG. 1, the luminaire 10 according to the embodiment of the present invention can be movably attached to a duct rail (not shown) attached to a mounted portion such as a ceiling to change the illumination direction. Can be used as a spotlight.

  The luminaire 10 includes a luminaire base 11 that is movable along a duct rail, an arm 20 that is pivotable on the lower surface of the luminaire base 11 (see arrow A in FIG. 1), and a lower end of the arm 20. The lamp 30 is rotatably provided.

The lighting fixture base 11 accommodates a ballast (not shown) inside, and a plug 12 projects upward from one end of the upper surface 11A, and a locking body 13 projects upward from the other end. Provided.
The plug 12 has a pair of terminal portions. When the plug 12 is attached to the duct rail, the plug 12 comes into contact with a current-carrying plate (not shown) provided inside along the opening of the terminal portion duct rail, and is used for lighting. While being supplied with electric power, the lighting fixture 10 is locked to the duct rail.
The locking body 13 moves along the opening of the duct rail.
Thereby, when moving the luminaire 10 along the duct rail, the luminaire base 11 can maintain the orientation along the opening of the duct rail.

The lamp 30 has a lamp body 31 that is a substantially truncated cone-shaped container that opens forward in the irradiation direction, and the lamp body 31 is moved in the vertical direction (arrow B in FIG. Reference) is supported rotatably.
Therefore, since the lamp 30 is rotatably supported in the horizontal plane and the vertical plane, it is possible to illuminate a desired direction.

As shown in FIG. 2, the lamp body 31 has an internal space 31A, and a base 32 is accommodated in the internal space 31A.
A mounting substrate 34 on which the LED light source 33 is mounted is attached to the front surface 32 </ b> A of the base 32. In addition, a reflector 35 is attached to the front surface 32A of the base 32 around the LED light source 33, and reflects light emitted from the LED light source 33 in the irradiation direction.

A lens 40 is attached in front of the irradiation direction of the LED light source 33. Further, a translucent cover 50 is attached in front of the lens 40.
As shown in FIG. 3, the lens 40 includes a Fresnel lens 41 that faces the LED light source 33, and a rising wall 45 that is provided on the entire outer periphery of the Fresnel lens 41 along the irradiation direction. The rising wall 45 is provided on the front side and the rear side in the irradiation direction with respect to the Fresnel lens 41.
The lens 40 is not limited to glass or plastic, and a hybrid lens made of glass and plastic can be used.

The Fresnel lens 41 has a plano-convex lens-like central lens portion 42 through which the optical axis CL passes through the center, and a plurality of peak portions 43 provided concentrically with respect to the optical axis CL outside the central lens portion 42. It is composed of an annular lens portion 44.
The crest 43 has an upright surface 43A that is on the optical axis CL side and has a small crossing angle with the optical axis CL, and an effective surface 43B that is, for example, an arc surface that intersects the upright surface 43A.

As shown in FIG. 4, in each peak portion 43 of the annular lens portion 44, the elevating surface 43 </ b> A is subjected to light diffusion processing such as embossing, for example.
This prevents uneven irradiation caused by the Fresnel lens 41 having a plurality of annular ridges 43.

Further, an uneven portion 46 is provided on the outer peripheral surface of the rising wall 45. The concavo-convex portion 46 can be formed in, for example, a substantially triangular shape with the front side surface 46B on the front side in the irradiation direction as a base. In addition, the outer surface 46A of the concavo-convex portion 46 can have a curved shape such as a circle convex outward.
Thereby, the light LB incident on the rising wall 45 from the LED light source 33 is totally reflected by the outer surface 46A of the concavo-convex portion 46, and is refracted and irradiated in the irradiation direction.
Note that a light diffusion process such as embossing can also be performed on the front side surface 46B substantially orthogonal to the optical axis CL in the concavo-convex portion 46.

As described above, according to the lighting fixture 10 of the embodiment according to the present invention described above, the elevation surface 43 </ b> A of the Fresnel lens 41 provided in front of the irradiation direction of the LED light source 33 is subjected to light diffusion processing. In addition, a translucent rising wall 45 is provided on the outer peripheral edge of the Fresnel lens 41 along the irradiation direction, and an uneven portion 46 is provided on the outer peripheral surface of the rising wall 45.
For this reason, it is possible to control not only the irradiation light in the direction of the optical axis CL but also the brightness and glare of the light irradiated in the direction orthogonal to the optical axis CL, and it is possible to produce liveliness while suppressing glare. .

  Further, since the rising wall 45 protrudes to the incident side and the emission side of the Fresnel lens 41, light distribution control can be performed by the rising wall 45 even for light that does not reach the Fresnel lens 41.

  Further, the concavo-convex portion 46 has a substantially triangular cross section, and the front side surface 46B on the irradiation direction side is substantially orthogonal to the optical axis. For this reason, the light LB incident on the rising wall 45 from the LED light source 33 is totally reflected by the outer surface 46A of the concavo-convex portion 46 and is refracted and irradiated in the irradiation direction, so that the light distribution efficiency is improved.

  Furthermore, since a hybrid lens can be used for the lens 40, highly accurate processing is possible.

In addition, the lighting fixture of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
For example, in the above-described embodiment, the case where the uneven portion 46 formed on the outer peripheral surface of the rising wall 45 is provided in a ring shape orthogonal to the optical axis CL is exemplified. In addition, as shown in FIGS. 5 (A) and 5 (B), an uneven portion 47 parallel to the optical axis CL can be provided on the rising wall 45B.

DESCRIPTION OF SYMBOLS 10 Lighting fixture 33 LED light source 41 Fresnel lens 43A Elevation surface 45, 45B Elevation wall 46, 47 Concavity and convexity 46B Front side surface (surface on the irradiation direction side)

Claims (2)

An LED light source;
A Fresnel lens provided in front of the irradiation direction of the LED light source,
Light diffusing treatment of the elevation surface of the Fresnel lens,
While providing a translucent rising wall along the irradiation direction on the outer peripheral edge of the Fresnel lens, providing an uneven portion on the outer peripheral surface of the rising wall ,
The rising wall protrudes on the incident side and the emission side of the Fresnel lens,
The concavo-convex portion has a substantially cross-sectional triangle shape, and the surface on the irradiation direction side is substantially orthogonal to the optical axis, and the outside thereof has a convex curved shape . The lighting fixture according to claim 1,
A lighting fixture in which the lens is a hybrid lens .

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