Light emitting module, lighting device, and lighting apparatus
View Patent ↗A light-emitting module includes: a first light-emitting element that emits light from an upper surface and side surfaces thereof; a second light-emitting element that mainly emits light from an upper surface thereof; a first sealer; and a second sealer. A first ratio, defined as a ratio of a heightwise distance from a top of the first sealer to the upper surface of the substrate with respect to a width of the first sealer at the upper surface of the substrate, is larger than a second ratio, defined as a ratio of a heightwise distance from a top of the second sealer to the upper surface of the second light-emitting element with respect to a width of the second sealer at a position corresponding to the upper surface of the second light-emitting element. A ratio of the first ratio to the second ratio is less than 1.85.
1. A light-emitting module, comprising:
a substrate;
a first light-emitting element and a second light-emitting element that are each provided on an upper surface of the substrate and each emit light having a different peak wavelength;
a first sealer that covers the first light-emitting element and includes a light-transmissive material; and
a second sealer that covers the second light-emitting element wherein
the first light-emitting element emits light from an upper surface and side surfaces thereof,
the second light-emitting element mainly emits light from an upper surface thereof,
a first ratio that is defined as, in a vertical cross section of the first sealer that passes through a center of the upper surface of the first light-emitting element, a ratio of a heightwise distance from a top of the first sealer to the upper surface of the substrate with respect to a width of the first sealer at the upper surface of the substrate, is larger than a second ratio that is defined as, in a vertical cross section of the second sealer that passes through a center of the upper surface of the second light-emitting element, a ratio of a heightwise distance from a top of the second sealer to the upper surface of the second light-emitting element with respect to a width of the second sealer at a position corresponding to the upper surface of the second light-emitting element, and
a ratio of the first ratio to the second ratio is less than 1.85.
2. The light-emitting module of claim 1 , wherein
the ratio of the first ratio to the second ratio is at least 1.25 and at most 1.65.
3. The light-emitting module of claim 1 , further comprising:
a third light-emitting element that emits light having the same peak wavelength as the first light-emitting element; and
a fourth light-emitting element that emits light having the same peak wavelength as the second light-emitting element, wherein
the third light-emitting element is provided on the upper surface of the substrate and aligned with the first light-emitting element to form a first light-emitting element column,
the fourth light-emitting element is provided on the upper surface of the substrate and aligned with the second light-emitting element to form a second light-emitting element column, and
the first sealer and the second sealer have a strip-like shape, and respectively cover the first light-emitting element column and the second light-emitting element column.
4. The light-emitting module of claim 1 , wherein
the light emitted by the first light-emitting element is blue light, and the light emitted by the second light-emitting element is red light.
5. A lighting device including the light-emitting module of claim 1 .
6. A lighting apparatus including the light-emitting module of claim 1 .
7. The light-emitting module of claim 2 , wherein
the ratio of the first ratio to the second ratio is at least 1.5 and at most 1.65.
8. The light-emitting module of claim 4 , wherein
the first sealer includes a wavelength conversion material, the wavelength conversion material converting a wavelength of a portion of the blue light into a wavelength of light having a different color, so as to emit, as light from the light-emitting module as a whole, white light obtained by mixing the blue light, the red light, and the light having the different color.
9. The light-emitting module of claim 4 , wherein
the peak wavelength of the blue light is at least 440 nm and at most 470 nm, and the peak wavelength of the red light is at least 600 nm and at most 660 nm.