TWI422784B - Illumination apparatus - Google Patents

Description

Lighting device

The present invention relates to a lighting device, and more particularly to a lighting device for a road and a shoulder, which can meet both lighting safety requirements and energy saving requirements.

In the outdoor dim ambience at night, the lighting safety requirements and lighting requirements of lighting devices (such as street lamps) are contradictory. Further, it is possible to provide a safe driving environment by sufficiently illuminating the road, but the time spent by the person and the car does not cause a waste of lighting energy. On the other hand, the waste of lighting energy can be reduced by shortening the time for lighting the street lamp and reducing the number of lighting of the street lamp, but insufficient lighting causes safety concerns of traffic and public security.

Figure 1 is a schematic illustration of a lighting device illuminating roads and shoulders. Referring to FIG. 1 , the main illumination area of the illumination device 100 is the road R, and the secondary illumination area is the shoulder F. If the illumination of the shoulder F is not sufficient, the driving 110 may be unresponsive to things that suddenly appear from the shoulder F, which may reduce driving safety. However, the above situation is usually an incident, for which long-term, high-brightness, wide-range illumination of the shoulder F can cause energy waste, and the surrounding environment of the shoulder F can also cause light damage, reducing the sleep quality of the surrounding residents 120. .

Embodiments of the present invention provide a lighting device that utilizes a visual effect of a human eye to design a light source module of a lighting device, which can meet both lighting safety requirements and energy saving requirements.

Embodiments of the present invention provide a lighting device for illuminating a first area and a second area. The first area is for example a road and the second area is for example a road shoulder. The lighting device comprises: a first light source module and a second light source module. The first light source module provides a first light having a first spectral composition. The first ray has a visual ratio (S/P) of less than 2, and the visual ratio is defined as the ratio of dark visual luminosity (S) to bright visual luminosity (P). The second light source module provides a second light having a second spectral composition. The second light has a visual ratio greater than two, wherein the color temperature of the second light is approximately the color temperature of the first light, and the dark visual effect of the second light is greater than the dark visual effect of the first light. Dark visual efficacy is defined as the ratio of dark visual luminosity to power.

In an embodiment of the invention, the color temperature of the first light and the color temperature of the second light are less than 4,000K.

In an embodiment of the invention, the second light source module includes: a red light source, a blue light source, and a green phosphor. The red light source provides a red light. The blue light source provides a blue light. The green phosphor is excited by blue light to provide a green light. The red, blue, and green lights described above form the second spectral composition.

In an embodiment of the invention, the wavelength distribution of the green light is 500 nm to 560 nm.

In an embodiment of the invention, the wavelength main component distribution selection of the green light is determined according to the ambient brightness of the second region, when the second region is The smaller the ambient brightness is, the main component of the green light wavelength shifts to 500 nm, and the greater the ambient brightness of the second region, the main component of the green wavelength shifts to 560 nm.

In an embodiment of the invention, the second light source module includes: a blue light source, a green phosphor, and a red phosphor. The blue light source provides a blue light. The green phosphor is excited by blue light to provide a green light. The red phosphor is excited by blue light to provide a red light. The red, blue, and green lights described above form the second spectral composition.

In an embodiment of the invention, the second light source module includes: a red light source, a blue light source, and a green light source. The red light source provides a red light. The blue light source provides a blue light. The green light source provides a green light. The red, blue, and green lights described above form the second spectral composition.

In an embodiment of the invention, the second light source module includes: a red light source, a blue light source, a green light source, and a white light source. The red light source provides a red light. The blue light source provides a blue light. The green light source provides a green light. The white light source provides a white light. The red, blue, green, and white light described above form the second spectral composition.

In an embodiment of the invention, the first light source module includes: a blue light source and a yellow phosphor. The blue light source provides a blue light. The yellow phosphor is excited by blue light to provide a yellow light. The blue light and the yellow light described above form the first spectral composition.

In an embodiment of the invention, the first light source provided by the first light source module is illuminated to a portion of the second region and partially overlaps the second light.

In an embodiment of the invention, the first light provided by the first light source module is illuminated to the first area, and the second light provided by the second light source module is illuminated to the second area.

Based on the above, the illumination device of the present invention has a first light source module and a second light source module. The first light source module and the second light source module respectively provide: a first light having a first spectral composition and a second light having a second spectral composition; and a visual ratio of the second light is greater than a visual ratio of the first light; The color temperature of the second light is approximated to the color temperature of the first light; and the dark visual effect of the second light is greater than the dark visual effect of the first light. In this way, the design of the light source module of the lighting device can be performed by utilizing the visual effect of the human eye, and the lighting safety requirement and the energy saving demand can be balanced.

In order to make the above-described features of the present invention more comprehensible, the following detailed description of the embodiments will be described in detail below.

2 is a schematic view of a lighting device in accordance with a preferred embodiment of the present invention. Referring to FIG. 2, the illumination device 200 is configured to illuminate the first region R and the second region F, for example, a road, and the second region F is, for example, a shoulder. The illumination device 200 includes a first light source module 210 and a second light source module 220. The first light source module 210 provides a first light ray L1 having a first spectral composition. The first ray L1 has a visual ratio (S/P ratio) of less than 2, and the visual ratio is defined as the ratio of dark visual luminosity (S) to bright visual luminosity (P). The second light source module 220 provides a second light ray L2 having a second spectral composition. The second light ray L2 has a visual ratio greater than 2, wherein the second The color temperature of the light L2 is similar to the color temperature of the first light L1, and the dark visual effect of the second light L2 is greater than the dark visual effect of the first light L1. Dark visual efficacy is defined as the ratio of dark visual luminosity to power.

FIG. 3 is a schematic diagram of a visual effect curve of a light vision (Photopic, P), a Mesopic, and a Scotopic (S) as a function of wavelength according to an embodiment of the present invention. Referring to FIG. 3, the photoreceptor cells in the human eye may have different effects under different visual states. For example, for light having a wavelength distribution of 505 nm, the light-sensing efficiency in a dark visual state is high. The visual effect curve of the inter-visual is between the visual state and the dark visual state, and it has dynamic characteristics, which will vary with the background brightness of the light environment.

The light source evaluation of the visual environment is evaluated by visual ratio (S/P) as a parameter. The so-called visual ratio (S/P) is the ratio of the lumen calculated by the spectrum to the visual visual effect curve and the dark visual visual effect curve, respectively. In general, light with a higher visual ratio is suitable for use in a low-light dark visual environment, and a lower visual ratio is suitable for use in a high-brightness visual environment. The source spectrum of the appropriate visual ratio can be adjusted based on the measured ambient brightness values. Generally, white light of high color temperature has a higher visual ratio, and white light of low color temperature has a lower visual ratio. The visual ratio can be described by the following formula (1):

Where S(λ) is the spectral radiant of wavelength λ (spectral radiant Intensity), V(λ) is photopic vision visual spectral sensitivity, and V'(λ) is scotopic vision visual spectral sensitivity.

In view of the above, please refer to FIG. 2 again, since the brightness requirement of the second area F (such as the shoulder) does not need to be higher than the brightness of the first area R (such as a road), the brightness of the second area F can be controlled in the medium vision. Within the scope of. Using the effect of the human eye on the intervening vision, the second spectral composition of the second light ray L2 illuminating the second region F is adjusted, although the light energy projected in the second region F is reduced, but the human eye can be generated for the second light ray L2. Higher brightness. In short, the visual ratio (greater than 2) of the second ray L2 at the second region F is higher than the visual ratio (less than 2) of the first ray L1 at the first region R, and the dark ray of the second ray L2 The effect is greater than the dark visual effect of the first light L1, and sufficient lighting requirements can be achieved. In this way, it is possible to meet the lighting safety requirements and achieve the effects of energy saving and light reduction at the same time due to low irradiation energy and brightness.

In addition to considering the visual ratio, the illumination device 200 of the embodiment of the present invention can also satisfy the actual lighting demand by considering the output light color (color temperature consideration) having white light characteristics and the light flux efficiency of dark vision. Referring to FIG. 2, the color temperature of the first light L1 and the color temperature of the second light L2 may be less than 4,000K. In other words, the first light L1 and the second light L2 may have a uniform color temperature performance. In this way, the light colors of the first region R and the second region F can be close to low color temperature illumination, and the color temperatures of the two regions are not excessively large, and can give a comfortable lighting experience for the human eye.

Furthermore, it is not enough to consider only the above visual ratio, by further Step by consideration: "The dark visual effect of the second light L2 is greater than the dark visual effect of the first light L1", and a good dark-lens luminous flux efficiency can be achieved. In more detail, the dark visual luminosity caused by the unit power of light is the dark visual effect. If the dark visual effect of the second light L2 is greater than the dark visual effect of the first light L1, then the dark visual luminosity (dark visual lumen) of the second light L2 will be greater than the first light L1 at the same light power. Dark visual luminosity (dark visual lumens), in other words, the dark visual luminosity perceived by the human eye for the second light is higher than the dark visual luminosity perceived by the human eye for the first light. In this way, the second light L2 can use relatively low power (to meet the energy saving demand), and still achieve a good lighting effect (to meet the lighting safety requirements).

For example, an example of the second light ray L2 is: a color temperature of 3033K, a color rendering value of 8.84, a visual ratio of 2.33, a clear visual lumen of 43.6, and a dark visual lumen of (43.6 x 2.33) = 101.59; a corresponding first ray An example of L1 is: color temperature is 2986K, color rendering is 70.7, visual ratio is 1.12, bright visual lumen is 76, and dark visual lumen is (76 x 1.12) = 85.12. Obviously, after considering the visual scale and the luminous flux efficiency of the dark vision, the dark visual lumen of the second ray L2 (101.59) can be made larger than the dark visual lumen of the first ray L1 (85.12).

4 is a schematic diagram of a first light source module and a second light source module according to a preferred embodiment of the present invention. Referring to FIG. 2 and FIG. 4 simultaneously, the second light source module 220 can include a plurality of light emitting diode packages 222, each of which can emit low temperature white light by using multicolor light mixing. For example, each of the light emitting diode packages 222 can include: a blue light source 222A, red Light source 222B and green phosphor 222C. The blue light source 222A provides a blue light. Red light source 222B provides a red light. Green phosphor powder 222C is excited by blue light to provide a green light. The red, blue and green light described above form a second spectral composition of the second light L2.

As shown in FIG. 4, the red light source may be a red LED chip, and the blue light source may be a blue LED chip. The green phosphor may be a person skilled in the art. The fluorescent powder selected for the design needs. By using a combination of red light, blue light and green light, the spectral composition of the second light L2 can have a higher ratio of red light components and form a white light with a low color temperature. In particular, for the second area F, there is often a traffic warning sign, and by making the second light ray L2 have a higher ratio of red light components, it is possible to clearly see the red warning attention mark by driving.

Further, the wavelength distribution of the green light of the second light ray L2 may be 500 nm to 560 nm. The distribution of the main components of the wavelength of the green light can be adjusted, and the intervening visual effect caused by the second light L2 on the human eye can be adjusted. For example, the wavelength main component distribution selection of the green light of the second light L2 may be determined according to the ambient brightness of the second region F, and the smaller the ambient brightness of the second region F (such as the shoulder), the distribution of the main components of the wavelength of the green light. Moving to 500 nm, and when the ambient brightness of the second region F is larger, the main component of the wavelength of green light moves toward 560 nm. Tables 1 to 3 are related data between the visual brightness (nit) set in the light environment of the second area F (shoulder) and the luminescence peak setting (ie, green wavelength) (nm) of the green fluorescent powder, depending on the application. The field situation is chosen for use.

It can be seen that the peak value (nm) of the green phosphor is changed according to the visual brightness (nit) set by the shoulder light environment, and the darker the setting brightness, the closer the peak of the green phosphor powder is to 500 nm; The brighter the set brightness, the closer the peak of the wavelength of the green phosphor is to 560 nm. Thereby, the second visual light effect can be controlled by the second light ray L2, and even if the light source energy of the second light ray L2 is low, the human eye can still be quite sensitive to the second light ray L2. The above-mentioned roadside light environment setting is the visual brightness of each country. According to the relevant regulations of road lighting, the spectral characteristics (visual ratio) of the lighting device and the light source can be designed according to the relevant regulations or usage requirements of road lighting in various countries, and the required road lighting brightness can be satisfied, and the lighting safety can be considered. Demand and energy saving needs.

Referring to FIG. 4 again, the first light source module 210 can include a plurality of light emitting diode packages 212. Each of the light emitting diode packages 212 can emit low temperature white light by using multicolor light mixing. For example, each of the light emitting diode packages 212 can include a blue light source 212A and a yellow phosphor powder 212B. The blue light source 212A provides a blue light. Yellow phosphor powder 212B is excited by blue light to provide a yellow light. The blue light and the yellow light described above form the first spectral composition.

5A-5C are schematic diagrams of three other second light source modules according to a preferred embodiment of the present invention. Referring to FIG. 5A to FIG. 5C , the second light source module 220 can also be used with other low-temperature white light emitting diode chips and phosphor powder. For example, the following three combinations can be adopted, as shown in FIG. 5A . The first type of second light source module 220 can include a plurality of light emitting diode packages 222. Each of the light emitting diode packages 222 may include a blue light source 222A, a green phosphor powder 222C, and a red phosphor powder 222D. The blue light source 222A provides a blue light. Green phosphor powder 222C is excited by blue light to provide a green light. Red phosphor 222D is excited by blue light to provide a red light. The red, blue, and green lights described above form the second spectral composition.

As shown in FIG. 5B , the second second light source module 220 can include a plurality of light emitting diode packages 222 . Each of the light emitting diode packages 222 can include a red light source 222B, a blue light source 222A, and a green light source 222E. Red light source 222B provides a red light. The blue light source 222A provides a blue light. Green light Source 222E provides a green light. The red, blue, and green lights described above form the second spectral composition.

As shown in FIG. 5C , the third second light source module 220 can include a plurality of light emitting diode packages 222 . Each of the light emitting diode packages 222 can include a red light source 222B, a blue light source 222A, a green light source 222E, and a white light source 222F. The red light source provides a red light. The blue light source provides a blue light. The green light source provides a green light. The white light source provides a white light. The red, blue, green, and white light described above form the second spectral composition.

The second light source module 220 of the above-mentioned FIG. 5A to FIG. 5C can also be combined with the first light source module 210 illustrated in FIG. 4 to create a lighting device 200 that can meet both lighting safety requirements and energy saving requirements.

As shown in FIG. 2 above, the first light L1 provided by the first light source module 210 is illuminated to the first region R, and the second light L2 provided by the second light source module 220 is illuminated to the second region F. However, there are also different illumination modes as shown in FIG. 6. Figure 6 is a schematic illustration of another illumination device in accordance with a preferred embodiment of the present invention. Referring to FIG. 6 , the lighting device 202 is substantially the same as the lighting device 200 described above, except that in the lighting device 202 shown in FIG. 6 , the first light source module 210 provides the first The light ray L1 is illuminated to a portion of the second region F and partially overlaps the range of the second light ray L2. This optical design also meets both lighting safety requirements and energy saving requirements.

In summary, the illumination device of the present invention has at least the following features: the illumination device has a first light source module and a second light source module. The first light source module provides a first light having a first spectral composition, and the second light source mode The group has a second ray of a second spectral composition. In particular, the visual ratio of the second ray is greater than the visual ratio of the first ray; the color temperature of the second ray is approximately the color temperature of the first ray; and the dark visual effect of the second ray is greater than the dark visual effect of the first ray. In this way, the design of the light source module of the lighting device can be performed by utilizing the visual effect of the human eye, and the lighting safety requirement and the energy saving demand can be balanced.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 200, 202‧‧‧ lighting fixtures

110‧‧‧ Driving

120‧‧ ‧ households

210‧‧‧First light source module

212, 222‧‧‧Light Emitter Package

212A, 222A‧‧‧ blue light source

212B‧‧‧Yellow Fluorescent Powder

220‧‧‧Second light source module

222B‧‧‧Red light source

222C‧‧‧Green Fluorescent Powder

222D‧‧‧Red Fluorescent Powder

222E‧‧‧Green light source

222F‧‧‧White light source

L1‧‧‧First light

L2‧‧‧second light

R‧‧‧First area (road)

F‧‧‧Second area (shoulder shoulder)

Figure 1 is a schematic illustration of a lighting device illuminating roads and shoulders.

2 is a schematic view of a lighting device in accordance with a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram showing visual effects curves of bright vision, medium vision, and dark vision as a function of wavelength, which are considered by the illumination device according to the embodiment of the present invention.

4 is a schematic diagram of a first light source module and a second light source module according to a preferred embodiment of the present invention.

5A-5C are schematic diagrams of three other second light source modules according to a preferred embodiment of the present invention.

Figure 6 is a schematic illustration of another illumination device in accordance with a preferred embodiment of the present invention.

200‧‧‧Lighting device

210‧‧‧First light source module

220‧‧‧Second light source module

L1‧‧‧First light

L2‧‧‧second light

R‧‧‧First area (road)

F‧‧‧Second area (shoulder shoulder)

Claims (10)

An illumination device for illuminating an adjacent first region and a second region, the illumination device comprising: a first light source module, providing a first light having a first spectral composition, the first light having a visual ratio (S/P) of less than 2, the visual ratio being defined as a ratio of dark visual luminosity (S) to bright visual illuminance (P); and a second light source module providing a second spectral composition a second light having a visual ratio greater than 2; wherein a color temperature of the second light is approximate to a color temperature of the first light, and a dark visual effect of the second light is greater than a dark vision of the first light The effect of the dark visual function is defined as the ratio of the dark visual luminosity to the power; wherein the first light provided by the first light source module is illuminated to the first area, and the second light source module provides the first Two rays are illuminated to the second area. The lighting device of claim 1, wherein the color temperature of the first light and the color temperature of the second light are less than 4,000K. The illuminating device of claim 1, wherein the second light source module comprises: a red light source providing a red light; a blue light source providing a blue light; and a green fluorescent powder The blue light is excited to provide a green light, and the red light, the blue light and the green light form the second spectral composition. The illumination device according to claim 3, wherein the green light has a wavelength main component distribution of 500 nm to 560 nm. The illuminating device of claim 4, wherein the wavelength main component distribution of the green light is determined according to the ambient brightness of the second region, and the green light of the second region is smaller, the green light is The main component of the wavelength shifts to 500 nm, and as the ambient brightness of the second region increases, the distribution of the main component of the wavelength of the green light moves toward 560 nm. The illuminating device of claim 1, wherein the second light source module comprises: a blue light source providing a blue light; a green fluorescent powder excited by the blue light to provide a green light; and a red color The phosphor powder is excited by the blue light to provide a red light; the red light, the blue light and the green light form the second spectral composition. The illuminating device of claim 1, wherein the second light source module comprises: a red light source providing a red light; a blue light source providing a blue light; and a green light source providing a green color Light; the red light, the blue light and the green light form the second spectral composition. The illuminating device of claim 1, wherein the second light source module comprises: a red light source providing a red light; a blue light source providing a blue light; and a green light source providing a green light And a white light source providing a white light; The red light, the blue light, the green light, and the white light form the second spectral composition. The illuminating device of claim 1, wherein the first light source module comprises: a blue light source providing a blue light; and a yellow fluorescent powder excited by the blue light to provide a yellow light, the blue light The first spectral composition is formed with the yellow light. The illumination device of claim 1, wherein the first light provided by the first light source module illuminates a portion of the second region and partially overlaps the second light.