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JP-7855925-B2 - Lighting fixtures

JP7855925B2JP 7855925 B2JP7855925 B2JP 7855925B2JP-7855925-B2

Inventors

  • 石川 隼
  • 三上 貴裕

Assignees

  • 岩崎電気株式会社

Dates

Publication Date
20260511
Application Date
20220531

Claims (8)

  1. In a lighting fixture comprising a light source, a lens covering the light source, and a first support member and a second support member supporting the lens, The aforementioned lens is made of a heat-resistant material with a coefficient of linear expansion of 10 × 10⁻⁵ /K or higher. The first support member has a pair of first engaging portions that restrict the movement of the lens , and a second engaging portion that restricts the movement of the lens . The pair of first engaging portions are provided on or near a first axis that extends in a direction along the mounting surface to which the lens is attached, passing through a predetermined reference position of the lens, and restrict the movement of the lens from the reference position in a direction perpendicular to the first axis . The second engaging portion is provided on or near the first direction along the second axis perpendicular to the first axis with respect to the reference position, and restricts the movement of the lens from the reference position in the direction perpendicular to the second axis . The lens further comprises a reflective portion that reflects light, located in the direction opposite to the first direction with respect to the reference position when viewed from the thickness direction of the lens. A lighting fixture characterized by the following features.
  2. The lighting fixture according to claim 1, characterized in that one of the first engaging portion and the lens, and one of the second engaging portion and the lens, have a boss that protrudes in the thickness direction of the lens, and the other has a fitting portion into which the boss fits.
  3. The lighting fixture according to claim 1, characterized in that it comprises clamping portions that sandwich a flat portion parallel to the mounting surface provided on the lens from both sides in the thickness direction of the lens.
  4. The lighting fixture according to claim 3 , characterized in that the clamping portion has a predetermined gap between it and the flat portion.
  5. The lighting fixture according to claim 3 , characterized in that the clamping portion is made by sandwiching the planar portion between the first support member and the second support member, which are separate entities.
  6. The lighting fixture according to claim 1, characterized in that the reference position is the center of the lens or its vicinity.
  7. Having multiple light sources, The lighting fixture according to claim 1, characterized in that the lenses are provided in a one-to-one ratio with the light source, and each of the lenses is independently supported by the first support member and the second support member.
  8. The lighting fixture according to any one of claims 1 to 7 , characterized in that the lens is a lens made of silicone material.

Description

This invention relates to lighting fixtures. Generally, lighting fixtures comprise a light source, a lens covering the light source, and a support member for the lens and other components. These types of lenses include those molded from resin using materials such as acrylic (PMMA) or polycarbonate (PC) (see, for example, Patent Document 1). Japanese Patent Publication No. 2021-158078 This is a diagram showing lighting fixtures.This is a plan view of the light source unit.This is a diagram showing the lens unit.This is a diagram of a lens.This is a diagram showing the first support member.This diagram shows the lens being held, as viewed from the second support member side.This is a side cross-sectional view with the lens held in place.This diagram shows the case where other fitting parts and other bosses are provided on the Y-axis. Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows lighting fixture 1. More specifically, Figure 1(A) is a side view of lighting fixture 1, and Figure 1(B) is a top view (viewed from below) of lighting fixture 1. Lighting fixture 1 is mounted at a high position such as on a pole or roof and illuminates a competition area such as a tennis court from above. The competition area can also be called the lighting area or the illuminated surface. Lighting fixture 1 comprises a light source unit 2 and a housing 3 that covers the light source unit 2 from above, and the housing 3 is adjustable in angle θK by a U-shaped arm 4. The housing 3 has a hollow shape with an opening at the bottom, and houses the light source unit 2 inside the housing 3. The light source unit 2 emits illumination light downwards and forwards from the housing 3. The fixture angle θK is set, for example, within a range of 0° to 20° upwards with respect to the horizontal plane. By setting the fixture angle θK to an appropriate value, the light from the light source unit 2 can be directed towards the competition area. The fixture angle θK may be changed as appropriate within the range of 0° to 20°, or it may be changed to an angle outside the above range depending on the installation conditions of the lighting fixture 1. Unless otherwise specified, directions in this description are relative to lighting fixture 1. In each figure, the symbol FR indicates the forward direction of lighting fixture 1, and the symbol UP indicates the upward direction. Figure 2 is a plan view of the light source unit 2. The light source unit 2 comprises multiple light sources 5 and multiple lens units 11 that control the light distribution from each light source 5. Each light source 5 is a planar light source that emits planar light in a roughly circular (possibly square) shape when viewed from above, by densely arranging multiple (four in this configuration) light-emitting elements, such as a COB type LED. The lens unit 11 is a component that integrally includes multiple (eight in this embodiment) lenses 21 that cover the light source 5. A lens 21 is provided for each light source 5, and the lenses 21 are spaced apart from each other. In other words, there is a one-to-one relationship between the light source 5 and the lens 21, and gaps are provided between the lenses 21. This prevents heat from the light source 5 from affecting a lens 21 other than the one into which the light from the light source 5 enters. Furthermore, even if a lens 21 expands due to the heat from the light source 5, this expansion is prevented from affecting adjacent lenses 21. Since the lens unit 11 has multiple lenses 21 integrated into one unit, the multiple lenses 21 can be attached and detached together, which is advantageous for improving ease of assembly and other aspects. In this configuration, each lens unit 11 is made of the same part, but the number of lens units 11 and the number of lenses 21 in each lens unit 11 may be changed as appropriate. Also, any of the lens units 11 or lenses 21 may have different shapes. By the way, if the lighting fixture 1 is miniaturized or its power consumption increases, the temperature of the lens 21 may rise, and PMMA or PC may not have sufficient heat resistance. To ensure sufficient heat resistance, it is conceivable to use a silicone material for the lens 21, which has a higher heat resistance temperature than PMMA or PC. However, since the coefficient of thermal expansion of silicone materials is 25 × 10⁻⁵ to 40 × 10⁻⁵ /K, it is approximately 5 to 8 times higher than that of PMMA (5 × 10⁻⁵ to 9 × 10⁻⁵ /K) and PC (6 × 10⁻⁵ to 7 × 10⁻⁵ /K), which may result in the expected optical performance not being met due to displacement caused by thermal expansion. Thus, prioritizing heat resistance increases the coefficient of thermal expansion, resulting in significant displacement due to thermal expansion in conventional lens support structures. This configuration, however, uses a lens support structure that is less affected by the coefficient of thermal expansion, making it