TWI489661B - Light emitting device - Google Patents

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device that can improve chromatic aberration.

The light color of a conventional white light-emitting device including a light-emitting diode changes with the temperature of the light-emitting diode. For example, when the temperature of the light-emitting diode is high, the light color of the light-emitting device will be bluish; when the temperature of the light-emitting diode is low, the light color of the light-emitting device will be yellowish, thus causing the light color to follow The problem of variation due to temperature changes.

The present invention relates to a light-emitting device in which the light color of the light-emitting device is not changed by the temperature change of the light-emitting diode.

According to an embodiment of the present invention, a light-emitting device capable of improving chromatic aberration is proposed. The light emitting device comprises a base, a light emitting diode, a wavelength conversion layer, a cover body and a reflecting device. The base has an accommodation space. The light emitting diode is located on the bottom of the base for emitting a first wavelength of light. The wavelength conversion layer is located at the bottom of the pedestal and surrounds the light emitting diode. The cover is positioned on the base to cover the accommodation space. The reflecting device is connected to the cover body and located above the light emitting diode in the accommodating space and further comprises a reflection angle adjusting mechanism, a reflecting structure and a heat deformation element. The reflection angle adjustment mechanism pivots the cover. The reflective structure is pivotally connected to the reflection angle adjusting mechanism, and part of the first wavelength light is The reflective structure is reflected to the wavelength conversion layer and converted to produce a second wavelength of light, and the remaining first wavelength of light is then mixed with the second wavelength of light to form a spectrum. The heat deformation element is connected to the reflection angle adjustment mechanism, and the heat deformation element is deformed according to the temperature change, thereby driving the reflection angle adjustment mechanism to change the angle of the reflection structure, so that the ratio of the first wavelength light reflected to the wavelength conversion layer at different temperatures can be regulated. And adjusting the ratio of the remaining first wavelength light to the second wavelength light to maintain a spectrum of the first wavelength light and the second wavelength light at a different temperature.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

Referring to FIG. 1, a cross-sectional view of a light emitting device according to an embodiment of the present invention is shown. The light emitting device 100 includes a light emitting diode 110, a wavelength conversion layer 120, a susceptor 130, a cover 140, and a reflecting device 150.

The light emitting diode 110 is, for example, a blue LED, which is located on the bottom of the susceptor 130 and emits a first wavelength light L1. A part of the first wavelength light L11 is reflected by the reflecting device 150 to the wavelength conversion layer 120, and is converted. The second wavelength light L2 is generated, and the remaining first wavelength line L12 is further mixed with the second wavelength light L2 to form a spectrum conforming to the desired light color. In addition, the reflecting device 150 can change its reflection angle with temperature, so the ratio of the first wavelength light L1 reflected to the wavelength conversion layer 120 can be adjusted with different temperatures, thereby adjusting the remaining first wavelength light L12 and the second wavelength light. The ratio of L2 is such that the spectrum composed of the first wavelength light L1 and the second wavelength light L2 is maintained at a standard color at different temperatures. In this way, the light emitting device 100 The light color of the light is not greatly affected by the temperature change of the light emitting diode 110.

The wavelength conversion layer 120 is located at the bottom of the susceptor 130 and surrounds the light emitting diode 110. The wavelength conversion layer 120 is a closed or open circular wavelength conversion layer as seen in the top view of FIG. The wavelength conversion layer 120 comprises yellow, red, green phosphor or a combination thereof. In this embodiment, the wavelength conversion layer 120 contains yellow phosphor powder, so that the color of the converted second wavelength light L2 is yellow. In another embodiment, the wavelength conversion layer 120 contains both red and green phosphors, and the light color of the converted second wavelength light L2 is also yellow. In other embodiments, the wavelength conversion layer 120 may contain phosphors of other colors such that the color of the converted second wavelength light L2 is in a desired color.

Please refer to FIG. 2, which is a cross-sectional view showing the contraction of the reflecting device of FIG. 1. Taking the yellow phosphor powder of the wavelength conversion layer 120 as an example, when the temperature of the light emitting diode 110 is low, the reflection device 120 contracts (the angle A1 is reduced), so that less first wavelength light L11 (blue light) is reflected to Reacting with the wavelength conversion layer 120, excitation of less second wavelength light L2 (yellow light), and remaining more first wavelength light L12 (blue light) reacting with the second wavelength light L2 to synthesize a desired color light, such as white standard Light.

Please refer to FIG. 3, which is a cross-sectional view showing the expansion of the reflecting device of FIG. 1. When the temperature of the light-emitting diode 110 is high, the reflecting device 120 expands (the angle A1 is enlarged), so that more first-wavelength light L11 (blue light) is reflected to react with the wavelength conversion layer to excite more second-wavelength light. L2 (yellow light), the remaining less wavelength first light ray L12 (blue light) reacts with the second wavelength light ray L2 to synthesize a white standard light.

As can be seen from the above 2 and 3, the reflection device 150 changes with temperature. The angle A1 is changed so that the light color of the light-emitting device 100 does not greatly affect the temperature change, and is maintained in a desired color light such as white standard light or other color light.

Although the wavelength conversion layer 120 of the above embodiment is exemplified by the yellow phosphor-containing powder, when the light-emitting diode 110 is a light-emitting diode of other light colors, the wavelength conversion layer 120 contains phosphor powder of other colors to Obtain an expected light color (not limited to white light, but also other light colors).

The susceptor 130 has an accommodating space 131 for accommodating the light emitting diode 110, the wavelength conversion layer 120, and the reflecting device 150. The inner side wall 130s of the susceptor 130 is a reflecting surface that reflects light incident on the inner side wall 130s. In one embodiment, the light emitting device 100 can include a reflective sheet (not shown) disposed on the inner sidewall 130s of the base 130 to reflect light.

The cover body 140 is positioned on the base 130 to cover the accommodating space 131. The cover body 140 has a fixing rod 141 which is fixed to the cover body 140 so as to protrude from the cover body 140. In addition, the material of the cover 140 includes a light transmissive material, such as polymethylmethacrylate (PMMA) or polycarbonate (PC).

Please refer to Fig. 4, which is an enlarged schematic view showing a portion 4' of Fig. 1. The reflecting device 150 is connected to the cover 140 and located above the LED 201 in the accommodating space 131. The reflection device 150 includes a reflection angle adjustment mechanism 151, a reflection structure 152, and a heat deformation element 153.

The reflection angle adjusting mechanism 151 pivotally fixes the fixing rod 141 of the cover body 140. The reflection angle adjusting mechanism 151 includes a first rod member 1511 and a second rod member 1512 which are disposed in a crosswise manner, and the fixing rod 141 and the reflection rod of the cover body 140 are pivotally connected. Structure 152.

The reflective structure 152 is pivotally connected to the reflection angle adjustment mechanism 151. The reflective structure 152 includes a flexible structure 1521 and a reflective sheet 1522 in a V shape.

The flexible structure 1521 is pivotally connected to the reflection angle adjustment mechanism 151. Since the flexible structure 1521 has flexibility, when the reflection angle adjustment mechanism 151 is moved, the flexible structure 1521 can be deformed to change the size of the angle A1. In addition, the material of the flexible structure 1521 comprises a metal, a rubber or a high molecular polymer such as a plastic.

The reflection sheet 1522 is disposed on the flexible structure 1521, and can reflect the first wavelength light L1 (FIG. 1) incident on the reflection sheet 1522 into the first wavelength light L11 (FIG. 1) and the first wavelength light L12 (1st) Figure). Further, the material of the reflective sheet 1522 contains a metal or a high molecular polymer such as a plastic. The reflective sheet 1522 itself may be doped with reflective particles, or its surface may be coated or attached with a reflective layer.

The heat deformation element 153 connects the fixing rod 141 of the cover 140, the first rod 1511 and the second rod 1512. The heat-deformable element 153 has a Coefficient of Linear Thermal Expansion (CTE), which can be deformed with a change in temperature, thereby driving the first rod member 1511 and the second rod member 1512 of the reflection angle adjusting mechanism 151 to change the reflective structure 152. The angle A1 is such that the ratio of the first wavelength light L1 reflected to the wavelength conversion layer 120 at different temperatures can be adjusted, thereby adjusting the ratio of the remaining first wavelength light L12 to the second wavelength light L2, so that the first wavelength is at different temperatures. The spectrum of the light beam L12 and the second wavelength light L2 is maintained in a standard color.

In one embodiment, the thermal expansion element 153 may have a coefficient of thermal expansion greater than 20 (10 ^-6 /K), but may also be less than 20 (10 ^-6 /K). The material of the heat-deformable element 153 includes a metal or a non-metal, wherein the non-metal is, for example, a high molecular polymer such as nylon, polymethyl methacrylate (PMMA), polyvinyl chloride (PVC) or other suitable material. The heat distortion element 153 may be composed of at least one linear heat deformation element, at least one sheet heat deformation element, or a combination thereof. In the case of the sheet-shaped heat-deformable member, the heat-deformable member 153 has a circular or rectangular sheet shape with a constant hole therebetween for the fixing rod 141 to pass.

Please refer to Fig. 5, which is a cross-sectional view taken along line 5-5' in Fig. 4. The cover body 140 has two T-shaped sliding grooves 142 (only shown in FIG. 5), and the two ends of the flexible structure 152 each have a T-shaped sliding portion 1523 slidably disposed in the corresponding T-shaped sliding groove 142. Due to the T-shaped structure, the flexible structure 152 is not easily detached from the T-shaped sliding groove 142.

In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

4’‧‧‧Local

100‧‧‧Lighting device

110‧‧‧Lighting diode

120‧‧‧wavelength conversion layer

130‧‧‧Base

131‧‧‧ accommodating space

140‧‧‧ cover

141‧‧‧Fixed rod

142‧‧‧T-type sliding groove

150‧‧‧Reflecting device

151‧‧‧Reflecting angle adjustment mechanism

1511‧‧‧First member

1512‧‧‧second rod

1514‧‧‧Sliding section

152‧‧‧Reflective structure

1521‧‧‧Flexible structure

1522‧‧‧reflector

1523‧‧‧T-type sliding part

153‧‧‧Thermal deformation element

D1, D2‧‧‧ OD

L‧‧‧Standard light

L1‧‧‧first wavelength light

L11, L12‧‧‧ first wavelength light

L2‧‧‧second wavelength light

1 is a cross-sectional view of a light emitting device in accordance with an embodiment of the present invention.

Fig. 2 is a cross-sectional view showing the contraction of the reflecting device of Fig. 1.

Fig. 3 is a cross-sectional view showing the expansion of the reflecting device of Fig. 1.

Fig. 4 is an enlarged schematic view showing a portion 4' of Fig. 1.

Fig. 5 is a cross-sectional view taken along line 5-5' in Fig. 4.

4’‧‧‧Local

100‧‧‧Lighting device

110‧‧‧Lighting diode

120‧‧‧wavelength conversion layer

130‧‧‧Base

131‧‧‧ accommodating space

140‧‧‧ cover

150‧‧‧Reflecting device

L‧‧‧Standard light

L1‧‧‧first wavelength light

L11, L12‧‧‧ first wavelength light

L2‧‧‧second wavelength light

Claims (10)

An illuminating device capable of improving chromatic aberration comprises: a pedestal having an accommodating space; a illuminating diode on the bottom of the pedestal for emitting a first wavelength of light; and a wavelength conversion layer at the pedestal a bottom portion surrounding the light emitting diode; a cover body disposed on the base to cover the receiving space; and a reflecting device connected to the cover body and the light emitting diode in the receiving space The reflection device includes: a reflection angle adjustment mechanism pivotally connecting the cover body; a reflection structure having a contraction/expansion reflection angle, the reflection structure being pivotally connected to the reflection angle adjustment mechanism, and the portion a wavelength of light is reflected by the reflective structure to the wavelength conversion layer, and converted to generate a second wavelength of light, and the remaining first wavelength of light is further mixed with the second wavelength of light to form a spectrum; and a thermally deformable element, connected In the reflection angle adjusting mechanism, the heat deformation element is deformed according to a temperature change, thereby driving the reflection angle adjustment mechanism to contract/expand the reflection angle of the reflection structure, so that the temperature is different at different temperatures. The ratio of the wavelength of the light reflected to the wavelength conversion layer can be adjusted to adjust the ratio of the remaining first wavelength light to the second wavelength light to form the first wavelength light and the second wavelength light at different temperatures. This spectrum is maintained in a standard color. The illuminating device of claim 1, wherein the counter The angle adjustment mechanism comprises: a first rod member and a second rod member in a cross configuration, pivotally connecting the cover body and the reflective structure. The illuminating device of claim 2, wherein the heat distortion element connects the cover body, the first rod member and the second rod member. The illuminating device of claim 1, wherein the reflective structure comprises: a flexible structure pivotally connected to the reflection angle adjusting mechanism; and a reflective sheet disposed on the flexible structure. The illuminating device of claim 4, wherein the flexible structure and the reflective sheet are V-shaped. The illuminating device of claim 4, wherein the cover has two T-shaped sliding grooves, and each end of the flexible structure has a T-shaped sliding portion, and each of the T-shaped sliding portions is slidably disposed on Corresponding to the T-shaped sliding groove. The light-emitting device of claim 1, wherein the wavelength conversion layer contains yellow phosphor powder. The illuminating device of claim 1, wherein the wavelength conversion layer comprises red and green phosphor powder. The light-emitting device according to any one of claims 7 to 8, wherein the light-emitting diode system is a blue LED. The illuminating device of claim 1, wherein the thermally deformable element has a high coefficient of thermal expansion.