LED filament lamp

Abstract

An LED filament lamp (1) configured in operation to provide LED filament light (8), and having a central lamp axis (CLA) and comprising a plurality of first LED filaments (3), each first LED filament (31-34) being an elongate element having a first length (L1) extending in a longitudinal direction (LD), a first width (W1) extending perpendicular to the longitudinal direction (LD), and a second length (L2) extending perpendicular to the longitudinal direction (LD), a first width (W1) extending perpendicular to the longitudinal direction (LD), a first thickness (T1) extending perpendicular to the longitudinal direction (LD) and perpendicular to the first width (W1), and a first aspect ratio (AR1), where AR1 = W1 / T1 and a plurality of second LED filaments (4), each second LED filament (41-44) being an elongated element having a second length (L2) extending in the longitudinal direction (LD), a second width (W2) extending perpendicular to the longitudinal direction (LD), a second thickness (T2) extending perpendicular to the longitudinal direction (LD) and perpendicular to the second width (W2), and a second aspect ratio (AR2), where AR2 = W2 / T2. Each first LED filament is configured, in operation, to provide first LED filament light (6) having a first luminous flux (LF1), each second LED filament is configured, in operation, to provide second LED filament light (7) having a second luminous flux (LF2), and the second aspect ratio (AR2) is at least twice greater than the first aspect ratio (AR1).

Description

Technical Field

[0001] The present invention relates to an LED filament lamp, which includes at least one first LED filament and at least one second LED filament. Background Technology

[0002] The lighting trend is towards LED filament lamps. An LED filament lamp is an LED lamp designed to resemble a traditional incandescent bulb, featuring a visible filament for aesthetic and light distribution purposes, but with the high efficiency of a light-emitting diode.

[0003] LED filaments provide LED filament light and include multiple light-emitting diodes (LEDs) arranged in a linear array. Preferably, the LED filament has a length L and a width W, where L > 5W. The LED filament can be arranged in a straight or non-straight configuration, such as, for example, a curved configuration, a 2D / 3D helix, or a spiral. Preferably, the LEDs are arranged on an elongated carrier, which can be rigid (e.g., made of polymer, glass, quartz, metal, or sapphire) or flexible (e.g., made of polymer or metal, such as a film or foil).

[0004] In the case where the carrier comprises a first main surface and an opposing second main surface, the LED is disposed on at least one of these surfaces. The carrier can be reflective or translucent, such as translucent, and preferably transparent.

[0005] As used herein, the terms carrier and elongated carrier are used interchangeably, so that an elongated carrier can also be simply referred to as a carrier.

[0006] LED filaments may include an encapsulation that at least partially covers at least a portion of a plurality of LEDs. The encapsulation may also at least partially cover at least one of a first main surface and a second main surface. The encapsulation may be a flexible polymeric material, such as, for example, silicone. Furthermore, the LEDs may be arranged to emit LED light, for example, having different colors or spectra. The encapsulation may include a light-emitting material configured to convert at least a portion of the LED light into converted light. The light-emitting material may be a phosphor, such as an inorganic phosphor and / or quantum dots or quantum rods (QDs).

[0007] LED filaments can include multiple sub-filaments.

[0008] US 2022 / 0186890 A1 discloses a lamp including a lamp holder, a semi-reflective enclosure, at least one first solid-state light source filament disposed within the semi-reflective enclosure, and a second solid-state light source disposed within the semi-reflective enclosure. The reflectivity of the semi-reflective enclosure is in the range of 30% to 70% for light emitted by the at least one first solid-state light source filament and the second solid-state light source. The at least one first solid-state light source filament is disposed at a first distance of less than 7 mm from the semi-reflective enclosure, and the second solid-state light source is disposed at a second distance of more than 15 mm from the semi-reflective enclosure.

[0009] The goal is to improve the performance, functionality, and / or appearance of LED filament lamps. Summary of the Invention

[0010] The purpose of this invention is to overcome this problem and to provide an LED filament lamp with one or more of improved performance, improved functionality and improved appearance.

[0011] According to a first aspect of the invention, this and other objectives are achieved by an LED filament lamp configured to provide illumination in operation, the LED filament lamp having a central lamp axis CLA and including at least one first LED filament, each first LED filament being an elongated element having a first length L1 extending in a longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD, a first thickness T1 extending perpendicular to the longitudinal direction LD and perpendicular to the first width W1, and a first aspect ratio AR1, wherein AR1 = W1 / T1; and at least one second LED filament, each first LED filament having a first length L1 extending in a longitudinal direction LD, a first width W ... the first width W1, and a first aspect ratio AR1, wherein AR1 = W1 / T1; and at least one second LED filament, each first LED filament having a first length L1 extending in a longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD and the first width W1, and a first aspect ratio AR1, wherein AR1 = W1 / T1; and at least one second LED filament, each first LED filament having a first length L1 extending in a longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD and the first width W1, and a first aspect ratio AR1, wherein AR1 = W1 / T1; and at least one second LED filament, each first LED filament having a first length L1 extending in a longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD, and a first aspect ratio AR1, wherein AR1 = W1 / T1; and at least one second LED filament, each first LED filament having a first length L1 extending in a longitudinal direction The two LED filaments are elongated elements having a second length L2 extending in the longitudinal direction LD, a second width W2 extending perpendicular to the longitudinal direction LD, a second thickness T2 extending perpendicular to the longitudinal direction LD and perpendicular to the second width W2, and a second aspect ratio AR2, wherein AR2 = W2 / T2, wherein each first LED filament is configured to provide first LED filament light with a first luminous flux LF1 in operation, wherein each second LED filament is configured to provide second LED filament light with a second luminous flux LF2 in operation, and wherein the second aspect ratio AR2 is at least twice as large as the first aspect ratio AR1.

[0012] Thus, and specifically by providing at least one first LED filament and at least one second LED filament, the at least one first LED filament being configured to provide first LED filament light having a first luminous flux LF1 in operation, the at least one second LED filament being configured to provide second LED filament light having a second luminous flux LF2 in operation, and the second aspect ratio AR2 of the at least one second LED filament being at least twice the first aspect ratio AR1 of the at least one first LED filament, an LED filament lamp having at least one of improved performance, improved functionality, and improved appearance is provided when the LED filament lamp is operated to provide low lumen light output and when the LED filament lamp is operated to provide high lumen light output.

[0013] We can choose the first aspect ratio AR1 such that 2≥AR1≥0.5.

[0014] A second aspect ratio AR2 can be chosen, such that 8 ≥ AR2 ≥ 2.5.

[0015] The corresponding thicknesses T1 and T2 can be selected as 1.5≥T1 / T2≥0.5.

[0016] Each of the three embodiments described above provides an LED filament lamp with further improved performance, functionality, and / or appearance in both low and high lumen output scenarios.

[0017] The length ratio between the first length L1 of each first LED filament and the second length L2 of each second LED filament is defined as L1 / L2, and can be selected such that 0.8 ≤ L1 / L2 ≤ 1.2.

[0018] Each first LED filament includes a plurality of first LEDs, and each second LED filament includes a plurality of second LEDs, wherein the plurality of second LEDs may have at least 1.5 times the number of first LEDs.

[0019] The ratio between the first luminous flux LF1 and the second luminous flux LF2 is defined as LF1 / LF2, and can be selected such that... .

[0020] Each of the three embodiments described above provides an LED filament lamp with further improved functionality and / or appearance.

[0021] At least one first LED filament and at least one second LED filament may be arranged along the central lamp axis CLA and distributed alternately and evenly around the central lamp axis CLA.

[0022] It should be noted that, in this respect, "along" is intended to indicate an angle of less than + / -20 degrees with respect to the center light axis CLA.

[0023] This provides an LED filament lamp with particularly uniform light output and thus a further improved appearance.

[0024] The at least one first LED filament is arranged at a first distance D1 from the central lamp axis CLA, and the at least one second LED filament is arranged at a second distance D2 from the central lamp axis CLA, and the distances D1 and D2 can be selected such that D1 > D2.

[0025] The effect achieved is improved decorative lighting. This is because a low aspect ratio filament is used at a low luminous flux level, and when the second LED filament is turned off, the first LED filament will not illuminate the larger second LED filament, which might otherwise be visible due to this light, for example, through phosphor conversion, i.e., crosstalk.

[0026] A gap may be provided in the tangential direction between adjacent LED filaments, and the gap may have a size or width in the range of at least twice W1 and at most twice W2.

[0027] Thus, even when one of the multiple first and second LED filaments is turned off and does not emit light, an LED filament lamp with particularly uniform light output and therefore a further improved appearance is provided.

[0028] Each first LED filament may include a plurality of first LEDs disposed on a first elongated carrier, wherein a first elongated encapsulation covers the plurality of first LEDs, the first elongated encapsulation including a first luminescent material and / or a first light-scattering material, the first luminescent material being configured to at least partially convert first LED light emitted by the plurality of first LEDs into first converted light, and the first light-scattering material being configured to at least partially scatter the first LED light emitted by the plurality of first LEDs into first scattered light. Each second LED filament may include a plurality of second LEDs disposed on a second elongated carrier, wherein a second elongated encapsulation covering the plurality of second LEDs. The second elongated encapsulation material includes a second luminescent material and / or a second light-scattering material, the second luminescent material being configured to at least partially convert second LED light emitted by the plurality of second LEDs into second converted light, the second light-scattering material being configured to at least partially scatter the second LED light emitted by the plurality of second LEDs into second scattered light, and / or (i) the thickness TC2 of the second elongated carrier is greater than the thickness TC1 of the first elongated carrier, and / or (ii) the material of the second elongated carrier has a higher thermal conductivity than the material of the first elongated carrier.

[0029] Therefore, in particular, by providing a second elongated carrier with a thickness TC2 greater than that of the first elongated carrier and / or by using a material with a higher thermal conductivity than that of the first elongated carrier, an LED filament lamp with exceptionally good heat dissipation and thus extended lifespan is provided. Furthermore, by providing a package, the LED is protected from external influences, resulting in a more robust LED filament lamp and ensuring more uniform LED filament lamp light output.

[0030] The transmittance of the second slender carrier can be lower than that of the first slender carrier. The reflectance of the second slender carrier can be higher than that of the first slender carrier.

[0031] Thus, an LED filament lamp with particularly uniform light output and therefore further improved functionality and appearance is provided, especially when multiple first and second LED filaments are turned on and emitting light.

[0032] Multiple first LEDs can be arranged in a first array with a single column, and multiple second LEDs can be arranged in a second array with multiple columns.

[0033] Thus, an LED filament lamp with particularly uniform light output and therefore further improved functionality and appearance is provided, especially when multiple first and second LED filaments are turned on and emitting light.

[0034] Each first LED filament may include a plurality of first LEDs disposed on a first elongated carrier, wherein a first elongated package covers the plurality of first LEDs, and the first elongated package includes a first light-emitting material configured to at least partially convert first LED light emitted by the plurality of first LEDs into first converted light; each second LED filament may include a plurality of second LEDs disposed on a second elongated carrier, wherein a second elongated package covers the plurality of second LEDs, and the second elongated package includes a second light-emitting material configured to at least partially convert second LED light emitted by the plurality of second LEDs into second converted light; and wherein one or more of the following are applicable:

[0035] (i) The thickness TE1 of the first package is lower than the thickness TE2 of the second package, and

[0036] (ii) The concentration of the first luminescent material in the first encapsulant is lower than the concentration of the second luminescent material in the second encapsulant, and

[0037] (iii) The first luminescent material is of type P1 and the second luminescent material is of type P2, wherein type P2 is different from type P1.

[0038] Therefore, an LED filament lamp with particularly uniform light output and thus further improved functionality and performance is provided, especially in allowing for a variety of different customized and / or possible light outputs.

[0039] Each first LED filament can be configured to provide first LED filament light with a first correlated color temperature (CCT1) less than or equal to 2500 K, and each second LED filament can be configured to provide second LED filament light with a second correlated color temperature (CCT2) greater than or equal to 3000 K.

[0040] Therefore, an LED filament lamp with a further improved appearance is provided, especially when multiple first and second LED filaments are switched on and illuminated.

[0041] The first length L1 of each first LED filament can be different from the second length L2 of each second LED filament.

[0042] Therefore, an LED filament lamp with a further improved appearance is provided, especially when multiple first and second LED filaments are switched on and illuminated.

[0043] The first and second LED filaments can be arranged adjacent to each other relative to the longitudinal direction.

[0044] The first and second LED filaments can be arranged in positions that are offset relative to each other in the longitudinal direction.

[0045] An LED filament lamp may include at least one first LED filament and multiple second LED filaments.

[0046] An LED filament lamp may include at least one second LED filament and multiple first LED filaments.

[0047] An LED filament lamp may include multiple first LED filaments and multiple second LED filaments.

[0048] The LED filament lamp may also include a controller configured to perform one or more of the following: dimming and brightening the at least one second LED filament and dimming and brightening the at least one first LED filament.

[0049] Thus, an LED filament lamp with further improved functionality and performance is provided when one of at least one first and at least one second LED filament is turned off and does not emit light, and when both of at least one first and at least one second LED filament are turned on and emit light.

[0050] The controller can be further configured to dim the at least one second LED filament until the light from the second LED filament is provided with a second luminous flux equal to the first luminous flux.

[0051] Therefore, an LED filament lamp with further improved appearance, function and performance is provided, particularly in the transition between at least one first and at least one second LED filament being turned on and at least one second LED filament being turned off while at least one first LED filament remains on.

[0052] The controller can also be configured to turn off the at least one second LED filament and turn on the at least one first LED filament when the at least one second LED filament dims, so as to provide second LED filament light with a second luminous flux lower than the first luminous flux.

[0053] Therefore, an LED filament lamp with further improved appearance, function and performance is provided, particularly when at least one second LED filament is dimming or has dimmed to provide second LED filament light with a second luminous flux lower than the first luminous flux.

[0054] The controller can be further configured to dim the at least one first LED filament when the at least one second LED filament is turned off and the at least one first LED filament is turned on.

[0055] The controller can be further configured to make the at least one first LED filament brighten when the at least one second LED filament is turned off and the at least one first LED filament is turned on.

[0056] Therefore, an LED filament lamp with further improved appearance, function and performance is provided, especially for LED light output with very low luminous flux.

[0057] The controller can be further configured to turn on the at least one second LED filament and turn off the at least one first LED filament when the at least one first LED filament becomes bright, so as to provide first LED filament light with a first luminous flux at the upper threshold of the first luminous flux.

[0058] Therefore, an LED filament lamp with further improved appearance, function and performance is provided, especially in the transition between at least one second LED filament being turned off while at least one first LED filament is still turned on and between at least one first and at least one second LED filament being turned on.

[0059] The controller can be further configured to brighten the at least one second LED filament until the second LED filament light is provided with a second luminous flux having a desired value greater than the upper threshold of the first luminous flux.

[0060] Therefore, an LED filament lamp with further improved appearance, function and performance is provided, especially for LED light output with very high luminous flux.

[0061] The controller can also be configured to gradually change one or both of the first correlated color temperature CCT1 and the second correlated color temperature CCT2.

[0062] Therefore, an LED filament lamp is provided that can provide LED light with different desired colors without adversely affecting the appearance, function and performance of the LED filament lamp.

[0063] The present invention also relates to luminaires comprising at least one LED filament lamp according to the present invention.

[0064] It should be noted that the present invention relates to all possible combinations of the features described in the claims. Attached Figure Description

[0065] This and other aspects of the invention will now be described in more detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

[0066] Figure 1 A schematic cross-sectional top view of an embodiment of an LED filament lamp according to the present invention is shown, the LED filament lamp comprising a plurality of first LED filaments and a plurality of second LED filaments.

[0067] Figure 2 A schematic cross-sectional top view of another embodiment of an LED filament lamp according to the present invention is shown.

[0068] Figure 3 It shows that according to Figure 2 A schematic cross-sectional side view of an LED filament lamp.

[0069] Figure 4 A schematic cross-sectional side view of a first LED filament among a plurality of first LED filaments is shown.

[0070] Figure 5 A schematic cross-sectional side view of a second LED filament among a plurality of second LED filaments is shown.

[0071] Figure 6 A cross-sectional side view of a luminaire including an LED filament lamp according to the present invention is shown.

[0072] As shown in the figures, the dimensions of layers and regions are exaggerated for illustrative purposes; therefore, these dimensions are provided to illustrate the general structure of embodiments of the invention. The same reference numerals consistently denote the same elements. Detailed Implementation

[0073] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0074] Figure 1 A schematic cross-sectional top view of an embodiment of an LED filament lamp 1 according to the present invention is shown. The LED filament lamp 1 is configured to provide an LED filament lamp light 8 in operation. The LED filament lamp 1 includes a central lamp axis CLA. Typically, and regardless of the embodiment, the LED filament lamp 1 also includes at least one first LED filament 3 and at least one second LED filament 4. Figure 1 In the specific embodiment shown, the LED filament lamp 1 includes a plurality of first LED filaments 3 and a plurality of second LED filaments 4.

[0075] The plurality of first LED filaments 3 include N first LED filaments, where N is an integer greater than 1. Figure 1 In the illustrated embodiment, three first LED filaments 31, 32, and 33 are provided. Typically, and regardless of the embodiment, each first LED filament 31-33 is an elongated element having a first length L1 extending along a longitudinal direction LD, a first width W1 extending perpendicular to the longitudinal direction LD, and a first thickness T1 extending perpendicular to both the longitudinal direction LD and the first width W1. The longitudinal direction LD extends parallel to the central lamp axis CLA. Each first LED filament 31-33 also includes a first aspect ratio AR1 defined as AR1 = W1 / T1. Each first LED filament 31-33 is configured to provide first LED filament light 6 with a first luminous flux LF1 during operation.

[0076] The plurality of second LED filaments 4 include a number of M second LED filaments, where M is an integer greater than 1. Note that N can be equal to M, or N can be different from M. In alternative embodiments, M and / or N can even be equal to 1. Figure 1In the illustrated embodiment, three second LED filaments 41, 42, and 43 are provided. Typically, and regardless of the embodiment, each second LED filament 41-43 is an elongated element having a second length L2 extending in the longitudinal direction LD, a second width W2 extending perpendicular to the longitudinal direction LD, and a second thickness T2 extending perpendicular to both the longitudinal direction LD and the second width W2. Each second LED filament 41-43 also includes a second aspect ratio AR2 defined as AR2 = W2 / T2. Each second LED filament is configured to provide second LED filament light 7 with a second luminous flux LF2 in operation.

[0077] Typically, and regardless of the embodiment, the second aspect ratio AR2 is at least twice the size of the first aspect ratio AR1. The first aspect ratio A1 can be selected as 2 ≥ AR1 ≥ 0.5. The second aspect ratio A2 can be selected as 8 ≥ AR2 ≥ 2.5.

[0078] The first thickness T1 and the second thickness T2 can be selected such that 1.5 ≥ T1 / T2 ≥ 0.5. The first length L1 and the second length L2 can be selected such that the length ratio (defined as L1 / L2) between the first length L1 of each first LED filament 31-33 and the second length L2 of each second LED filament 41-43 satisfies the relationship 0.8 ≤ L1 / L2 ≤ 1.2.

[0079] The first width W1 can be in the range of 1 mm to 4 mm. The first thickness T1 can be in the range of 1 mm to 4 mm. The first length L1 can be in the range of 4 mm to 20 cm. The second width W2 can be in the range of 5 mm to 20 mm. The second thickness T2 can be in the range of 1 to 5 mm. The second length L2 can be in the range of 4 cm to 20 cm. As an example, the first width W1 can be 3 mm, the first thickness T1 can be 3 mm, and the first length L1 can be 8 cm, while the second width W2 can be 10 mm, the second thickness T1 can be 3 mm, and the second length L2 can be 8 cm.

[0080] A first luminous flux LF1 and a second luminous flux LF2 can be selected such that the ratio between the first luminous flux LF1 and the second luminous flux LF2 (defined as LF1 / LF2) satisfies the relationship LF1 / LF2≤0.5.

[0081] like Figure 1 and Figure 3 As shown, the LED filaments 31-33 of the multiple first LED filaments 3 and the LED filaments 41-43 of the multiple second LED filaments 4 are arranged along the central lamp axis CLA—see also Figure 3In this respect, "along" means that the LED filaments 31-33 of the first LED filaments 3 and the LED filaments 41-43 of the second LED filaments 4 are arranged such that their respective length dimensions L1 and L2 extend at an angle of up to 20 degrees with respect to the central lamp axis CLA. Figure 3 In this context, the angle is displayed as zero degrees. Furthermore, multiple first LED filaments 31-33 and multiple second LED filaments 41-43 are alternately and evenly arranged around the central lamp axis CLA.

[0082] In addition, from Figure 1 It can also be seen that a plurality of first LED filaments 3 are arranged at a first distance D1 from the central lamp axis CLA, and a plurality of second LED filaments 4 are arranged at a second distance D2 from the central lamp axis CLA. The first distance D1 and the second distance D2 can be selected such that D1 is greater than D2. Moreover, a spacing S is provided in the tangential direction between adjacent LED filaments 31-33 and 41-43. The spacing S can be selected as a size or width having at least twice the first width W1 and at most twice the second width W2.

[0083] Figure 2 A schematic cross-sectional top view of another embodiment of the LED filament lamp 100 according to the present invention is shown. The LED filament lamp 100 and... Figure 1 The only difference of the LED filament lamp 1 shown is the specific arrangement of the LED filaments 31-34 of the plurality of first LED filaments 3 and the LED filaments 41-43 of the plurality of second LED filaments 4 relative to each other, and the number of LED filaments 31-34 of the plurality of first LED filaments 3 provided.

[0084] Specifically, Figure 2 A configuration is shown in which the LED filaments 31-34 of a plurality of first LED filaments 3 and the LED filaments 41-43 of a plurality of second LED filaments 4 are arranged such that the LED filaments 31-34 of the plurality of first LED filaments 3 emitting first LED light 6 having a first lower luminous flux LF1 are arranged around the LED filaments 41-43 of the plurality of second LED filaments 4 emitting second LED light 7 having a second higher luminous flux LF2. Furthermore, three LED filaments 41-43 of the plurality of second LED filaments 4 and four LED filaments 31-34 of the plurality of first LED filaments 3 are provided.

[0085] Still referencing Figure 4Each first LED filament 31-34 includes a plurality of first LEDs 310 disposed on a first elongated carrier 311. The plurality of first LEDs 310 may be arranged in a first array having a single row. When the first LED filament 31 is mounted in the LED filament lamp 1 according to the invention, the first elongated carrier 311 extends in the longitudinal direction LD. The first elongated carrier 311 includes a first carrier thickness TC1. The first elongated carrier 311 includes a first main surface 315 and a second main surface 316 opposite to the first main surface 315. The plurality of first LEDs 310 may be disposed on the first main surface 315 and / or the second main surface 316. The plurality of first LEDs 310 are configured to emit first LED light in operation. Each first LED filament 31-34 is configured to emit first LED filament light 6 composed of first LED light in operation. For example, each first LED filament 31-33 may be configured to provide first LED filament light 6 having a first correlated color temperature CCT1 less than or equal to 2500 K.

[0086] Each first LED filament 31-34 may further include a first elongated package 312. The first elongated package 312 is arranged to cover a plurality of first LEDs 310. The first elongated package 312 has a first package thickness TE1. The first elongated package 312 may include a first light-emitting material 313. The first light-emitting material 313 is configured to at least partially convert the first LED light emitted by the plurality of first LEDs 310 into first converted light. Alternatively or additionally, the first elongated package 312 may include a first light-scattering material 314. The first light-scattering material 314 is configured to at least partially scatter the first LED light emitted by the plurality of first LEDs into first scattered light.

[0087] exist Figure 4 In the illustrated embodiment, a plurality of first LEDs 310 are arranged on a first main surface 315 of a first carrier 311. The first LED filament 31 may also include another elongated package 317 arranged on a second main surface 316. The other elongated package 317 may be the same as or different from the first elongated package 312.

[0088] Now for reference Figure 5Each second LED filament 41-43 includes a plurality of second LEDs 410 disposed on a second elongated carrier 411. The plurality of second LEDs 410 may be arranged in a second array having multiple columns. The plurality of second LEDs 410 may include LEDs in number at least 1.5 times that of the plurality of first LEDs 310. When the second LED filament 41 is mounted in the LED filament lamp 1 according to the invention, the second elongated carrier 411 extends in the longitudinal direction LD. The second elongated carrier 411 includes a second carrier thickness TC2. The second elongated carrier 411 includes a first main surface 415 and a second main surface 416 opposite to the first main surface 415. The plurality of second LEDs 410 may be disposed on the first main surface 415 and / or the second main surface 416. The plurality of second LEDs 410 are configured to emit second LED light in operation. Each second LED filament 41-43 is configured to emit second LED filament light 7 composed of second LED light in operation. For example, each second LED filament 41-43 can be configured to provide second LED filament light 7 with a second correlated color temperature CCT2 greater than or equal to 3000 K.

[0089] As described above, the LED filament lamp 1 is configured to emit an LED filament lamp light 8 during operation. The LED filament lamp light 8 includes at least one of a first LED filament lamp light 6 and a second LED filament lamp light 7. The LED filament lamp light 8 may be a white LED filament lamp light having a correlated color temperature in the range of 1700 K to 6500 K and / or a color rendering index of at least 80.

[0090] Each second LED filament 41-43 may further include a second elongated package 412. The second elongated package 412 is arranged to cover a plurality of second LEDs 410. The second elongated package 412 includes a second package thickness TE2. The second elongated package 412 may include a second light-emitting material 413. The second light-emitting material 413 is configured to at least partially convert the second LED light emitted by the plurality of second LEDs 410 into second converted light. Alternatively or additionally, the second elongated package 412 may include a second light-scattering material 414. The second light-scattering material 414 is configured to at least partially scatter the second LED light emitted by the plurality of second LEDs into second scattered light.

[0091] exist Figure 5 In the illustrated embodiment, a plurality of second LEDs 410 are arranged on a first main surface 415 of a second carrier 411. The second LED filament 41 may also include another elongated package 417 arranged on a second main surface 416. The other elongated package 417 may be the same as or different from the second elongated package 412.

[0092] The second carrier thickness TC2 of the second elongated carrier 411 may be greater than the first carrier thickness TC1 of the first elongated carrier 311. Alternatively or additionally, the material of the second elongated carrier 411 may have a higher thermal conductivity than the material of the first elongated carrier 311. Alternatively or additionally, the light transmittance of the second elongated carrier 411 may be lower than the light transmittance of the first elongated carrier 311.

[0093] The thickness TE1 of the first encapsulation 312 may be lower than the thickness TE2 of the second encapsulation 412. Alternatively or additionally, the concentration of the first luminescent material 313 in the first encapsulation 312 may be lower than the concentration of the second luminescent material 413 in the second encapsulation 412. Alternatively or additionally, the first luminescent material 313 may be a first type P1, and the second luminescent material 413 may be a second type P2, wherein the second type P2 is different from the first type P1.

[0094] Now for specific reference Figure 3 The LED filament lamp 1;100 also includes a translucent enclosure 2 that at least partially encloses the at least one LED filament assembly. The translucent enclosure 2 can be formed into any feasible shape, such as resembling any of a standard light bulb, a spherical light bulb, a candle bulb, a custom light bulb, or even a spiral light bulb. The translucent enclosure 2 may include a luminescent material. The translucent enclosure 2 may be a glass enclosure.

[0095] The LED filament lamp 1;100 also includes a base 9, such as a cover. A translucent enclosure 2 is attached to or mounted on the base 9. The base 9 is configured to electrically and mechanically connect the LED filament lamp 1;100 to a socket of the luminaire (see [link]). Figure 6 The translucent cover 2 may include a neck, and where provided, the neck forms a portion of the translucent cover 2 that is attached to or attached to the base 9.

[0096] The LED filament lamp 1;100 may also include threads 10 for connection to a socket and terminals 11 for connection to an electrical power source. Threads 10 and terminals 11 may be formed part of the base 9 or disposed on the base 9.

[0097] The LED filament lamp 1; 100 may optionally include a driver or controller 5 configured to control the LED filament lamp 1; 100; the driver or controller 5 may be an external unit, a unit arranged within the LED filament lamp 1; 100, such as... Figure 3 As shown, or a combination of these two units.

[0098] The LED filament lamp 1;100 may also include an exhaust pipe 12. The exhaust pipe 12 is preferably centrally located in the core post 13 of the LED filament lamp 1; the exhaust pipe 12 is configured to seal the gas between the translucent housing 2 and the exhaust pipe 12. A controller 5 may be arranged between the translucent housing 2 and the exhaust pipe 12.

[0099] The LED filament lamp 1;100 may also include one or two conductive baselines 14. Figure 3 In the illustrated embodiment, the connection between one or two conductive baselines 14 and the conductive wires of each LED filament 31-34 and 41-43 is achieved by connecting a corresponding wire segment 15 to one or two conductive baselines 14 at a first end. One or two conductive baselines 14 pass through the exhaust pipe 12 to be electrically connected to the driver 52 (see figure) at a second end opposite the first end (not visible in the figure). Figure 6 ) or controller 5 or power supply.

[0100] Finally, go to Figure 6 An exemplary luminaire in the form of a chandelier 50 is shown. The chandelier 50 includes an LED filament lamp 1; 100 according to any embodiment of the invention. In the illustrated embodiment, the LED filament lamp 1; 100 is... Figure 1 The type shown includes a substantially straight filament. In other embodiments, the filament of this LED filament lamp 1;100 may be a filament having other shapes, such as, but not limited to, spiral, helical, zigzag, twisted, flat, and combinations thereof.

[0101] The chandelier 50 also includes a socket 51 for connecting the LED filament lamp 1; 100 to the chandelier 50. The socket 51 is adapted to mate with the base 9 of the LED filament lamp 1; the socket 51 may include threads adapted to mate with the threads 10 of the LED filament lamp 1; 100; the socket 51 may include terminals adapted to mate with the terminals 11 of the LED filament lamp 1; 100.

[0102] The chandelier 50 may also include a driver 52 configured to control the LED filament lamps 1; 100. The driver 52 may or may not be the same unit as the controller 5 described above. In other words, the driver 52 and the controller 5 may be integrated into the same driver or controller, or they may be separate units. The driver 52 is configured to power a plurality of LED filaments 31-34 and 41-43 via the conductive wires of the LED filament lamps 1; 100; the driver 52 may also be configured to control at least one of the CCT and CRI of the LED filament lamp light 8. The driver 52 may also be configured to control other parameters related to the LED filament lamp light source (i.e., a plurality of LEDs), a plurality of first LED filaments 3, a first LED filament light 6, a plurality of second LED filaments 4, a second LED filament light 7, and the LED filament lamp L3.

[0103] like Figure 6 As shown, the driver 52 is arranged on the reflector or screen 53 of the chandelier 50. The driver may also be arranged within or incorporated into the reflector or screen 53. The chandelier 50 also includes a wire 54 for connecting to a power source (such as AC power).

[0104] Notice, Figure 6 The chandelier 50 shown is merely one example of a luminaire according to the invention. Any suitable type of luminaire can be contemplated, such as, but not limited to, floor lamps, wall-mounted lamps, chandeliers, reading lamps, outdoor lamps, and table lamps.

[0105] Those skilled in the art will recognize that the present invention is by no means limited to the preferred embodiments described above. Rather, many modifications and variations are possible within the scope of the appended claims.

[0106] Furthermore, by studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. The fact that certain measures are recited in mutually different dependent claims does not imply that combinations of these measures cannot be advantageously used.

Claims

1. An LED filament lamp (1) configured to provide LED filament light (8) during operation, the LED filament lamp having a central lamp axis (CLA) and comprising: At least one first LED filament (3), each first LED filament (31-34) is an elongated element having a first length L1 extending in a longitudinal direction (LD), a first width W1 extending perpendicular to the longitudinal direction (LD), a first thickness T1 extending perpendicular to the longitudinal direction (LD) and perpendicular to the first width (W1), and a first aspect ratio AR1, wherein AR1=W1 / T1; as well as At least one second LED filament (4), each second LED filament (41-44) is an elongated element having a second length L2 extending in the longitudinal direction (LD), a second width W2 extending perpendicular to the longitudinal direction (LD), a second thickness T2 extending perpendicular to the longitudinal direction (LD) and perpendicular to the second width (W2), and a second aspect ratio AR2, wherein AR2=W2 / T2; Each of the first LED filaments is configured to provide first LED filament light (6) with a first luminous flux (LF1) during operation. Each of the second LED filaments is configured to provide second LED filament light (7) with a second luminous flux (LF2) during operation; and The second aspect ratio AR2 is at least twice as large as the first aspect ratio AR1.

2. The LED filament lamp according to claim 1, wherein one of the following is applicable: (i) The LED filament lamp includes at least one first LED filament and a plurality of second LED filaments; and (ii) The LED filament lamp includes at least one second LED filament and a plurality of first LED filaments.

3. The LED filament lamp according to claim 1 or 2, wherein the following are applicable: as well as 。 4. The LED filament lamp according to any one of the preceding claims, wherein the following applies: The length ratio between the first length L1 of each first LED filament (31-34) and the second length L2 of each second LED filament (41-43) is defined as L1 / L2, where 0.8 ≤ L1 / L2 ≤ 1.2; Each of the first LED filaments (3) comprises a plurality of first LEDs, and each of the second LED filaments (4) comprises a plurality of second LEDs, wherein the number of the plurality of second LEDs is at least 1.5 times the number of the plurality of first LEDs; and The ratio of the first luminous flux LF1 to the second luminous flux LF2 is defined as LF1 / LF2, where LF1 / LF2≤0.

5.

5. The LED filament lamp according to any one of the preceding claims, wherein the at least one first LED filament (3) and the at least one second LED filament (4) are arranged along the central lamp axis (CLA) and are alternately and uniformly distributed around the central lamp axis (CLA).

6. The LED filament lamp according to any one of the preceding claims, wherein the at least one first LED filament (3) is arranged at a first distance D1 from the central lamp axis (CLA), and the at least one second LED filament (4) is arranged at a second distance D2 from the central lamp axis (CLA), wherein D1>D2.

7. The LED filament lamp according to any one of the preceding claims, wherein the spacing between adjacent LED filaments in the tangential direction is in the range of at least twice W1 and at most twice W2.

8. The LED filament lamp according to any one of the preceding claims, Each of the first LED filaments (31-34) includes a plurality of first LEDs (310) arranged on a first elongated carrier (311), wherein a first elongated package (312) covers the plurality of first LEDs, the first elongated package including a first light-emitting material (313) and / or a first light-scattering material (314), the first light-emitting material being configured to at least partially convert the first LED light emitted by the plurality of first LEDs into first converted light, and the first light-scattering material being configured to at least partially scatter the first LED light emitted by the plurality of first LEDs into first scattered light; Each of the second LED filaments (41-43) includes a plurality of second LEDs (410) disposed on a second elongated carrier (411), wherein a second elongated encapsulation (412) covers the plurality of second LEDs, the second elongated encapsulation including a second light-emitting material (413) and / or a second light-scattering material (414), the second light-emitting material (413) being configured to at least partially convert the second LED light emitted by the plurality of second LEDs into second converted light, and the second light-scattering material (414) being configured to at least partially scatter the second LED light emitted by the plurality of second LEDs into second scattered light; and Wherein (i) the thickness (TC2) of the second elongated carrier (411) is greater than the thickness (TC1) of the first elongated carrier (311) and / or (ii) the material of the second elongated carrier (411) has a higher thermal conductivity than the material of the first elongated carrier (311).

9. The LED filament lamp according to claim 8, wherein the light transmittance of the second elongated carrier (411) is lower than that of the first elongated carrier (311).

10. The LED filament lamp according to claim 8 or 9, wherein the plurality of first LEDs (310) are arranged in a first array having a single column, and the plurality of second LEDs (410) are arranged in a second array having multiple columns.

11. The LED filament lamp according to any one of the preceding claims, Each of the first LED filaments (31-34) includes a plurality of first LEDs (310) arranged on a first elongated carrier (311), wherein a first elongated package (312) covers the plurality of first LEDs, the first elongated package including a first light-emitting material (313) configured to at least partially convert the first LED light emitted by the plurality of first LEDs into first converted light; Each of the second LED filaments (41-43) includes a plurality of second LEDs (410) arranged on a second elongated carrier (411), wherein a second elongated package (412) covers the plurality of second LEDs, the second elongated package including a second light-emitting material (413) configured to at least partially convert the second LED light emitted by the plurality of second LEDs into second converted light; and One or more of the following apply: (i) The thickness (TE1) of the first package (312) is less than the thickness (TE2) of the second package (412), and (ii) The concentration of the first luminescent material (313) in the first encapsulant is lower than the concentration of the second luminescent material (413) in the second encapsulant, and (iii) The first luminescent material (313) is of type P1 and the second luminescent material (413) is of type P2, wherein the second type P2 is different from the first type P1.

12. The LED filament lamp according to any one of the preceding claims, wherein each first LED filament (31-34) is configured to provide first LED filament light (6) having a first correlated color temperature (CCT1) less than or equal to 2500 K, and wherein each second LED filament (41-43) is configured to provide second LED filament light (7) having a second correlated color temperature (CCT2) greater than or equal to 3000 K.

13. The LED filament lamp according to any one of the preceding claims, wherein the LED filament lamp (1) further comprises a controller (5), and wherein the controller is configured to operate the at least one first LED filament (3) and the at least one second LED filament (4) separately from each other.

14. The LED filament lamp of claim 11, wherein the LED filament lamp (1) further comprises a controller (5), and wherein the controller is further configured to gradually change one or both of the first correlated color temperature (CCT1) and the second correlated color temperature (CCT2).

15. A luminaire comprising at least one LED filament lamp (1; 100) according to any one of the preceding claims.

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