CN102606906A

CN102606906A - Lighting device

Info

Publication number: CN102606906A
Application number: CN2011103928441A
Authority: CN
Inventors: 斋藤孝; 槻谷绫子; 野口公喜; 户田直宏; 山口萨亚卡
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2011-01-24
Filing date: 2011-12-01
Publication date: 2012-07-25
Anticipated expiration: 2031-12-01
Also published as: CN102606906B; JP2012155907A

Abstract

Provided is a lighting device, which can improve the visual recognition under the intermediate vision viewing environment and comprises a light-emitting part (11). The peak wavelength of the light-emitting part (11) exists within the range of 470 nm - 505 nm and the half-peak half-width thereof (B) relative to the peak wavelength thereof is 20 nm to 40 nm.

Description

Lighting device

Technical field

The present invention relates to a kind of lighting device.

Background technology

In fluorescent lamp, light emitting diode various lighting devices such as (LED elements), be employed in the design that improves photopic vision brightness in the bright environment (photopic vision) usually.This is because the cone of perception lightness is played a role, and through improving photopic vision brightness, the people can carry out perception more brightly.

Yet; In the space, street at night, the so-called mesopic vision (Japanese: dawn looking) of path space etc.; (Japanese: peak value beam split visual sense efficient) is the above-mentioned cone of 555nm except spectral luminous efficiency; The peak value of spectral luminous efficiency is that the body of rod of 507nm also plays a role, so also low even improve its effect of photopic vision brightness.

Therefore, for example in the lighting device of patent documentation 1, considered to be present in above-mentioned cone and the two situation of in mesopic vision, moving of the body of rod on people's the retina, manifested effect respectively and possessed a plurality of light sources in order to make the cone and the body of rod.And at least 1 in this light source constitutes peak value between 450nm～550nm, so that become the wavelength region may that the peak wavelength of the spectral luminous efficiency that comprises the above-mentioned body of rod is 507nm.

Patent documentation 1: TOHKEMY 2008-91232 communique

Yet; In above-mentioned such lighting device; Possessed and constituted the light source of peak value between 450nm～550nm, realized the raising of the visuognosis degree of mesopic vision, but also hoped to develop the lighting device that can further improve the visuognosis degree under the mesopic vision environment.

Summary of the invention

The present invention makes in order to solve above-mentioned problem, and its purpose is, a kind of lighting device that can further improve the visuognosis degree under the mesopic vision environment is provided.

In order to solve above-mentioned problem, lighting device of the present invention possess peak wavelength be present between about 470nm～505nm, with respect to the half width at half maximum of this peak value illuminating part for about 20nm～40nm.

In addition, in above-mentioned formation, be preferably, illuminating part has first peak wavelength that is present between about 470nm～505nm and compares second peak wavelength that is present in long wavelength's one side with about 530nm.

In addition, in above-mentioned formation, be preferably, second peak wavelength of illuminating part is about 555nm.

In addition, in above-mentioned formation, be preferably, above-mentioned illuminating part constitutes, and the spectral intensity of above-mentioned first peak wavelength is stronger than the spectral intensity of second peak wavelength.

In addition, in above-mentioned formation, be preferably, illuminating part constitutes, and above-mentioned second peak wavelength be in a ratio of between about 560nm～590nm of long wavelength's one side, luminous output reduces.

The invention effect

According to the present invention, a kind of lighting device that can improve the visuognosis degree can be provided.

Description of drawings

Fig. 1 is the schematic block diagram of the lighting device in this embodiment.

Fig. 2 is used to explain that difference by wavelength causes to the curve map of the degree of influence of S/P ratio.

Fig. 3 is based on the performance plot to the spectrum of the illuminating part of the degree of influence of S/P ratio.

Fig. 4 is the schematic block diagram of the lighting device in other examples.

Fig. 5 is the schematic block diagram of the lighting device in other examples.

Fig. 6 is the schematic block diagram of the lighting device in other examples.

Fig. 7 is the schematic block diagram of the lighting device in other examples.

Symbol description:

10 lighting devices

11 illuminating parts

The B half width at half maximum

The specific embodiment

Below, according to accompanying drawing a specific embodiment of the present invention is described.

As shown in Figure 1, the lighting device 10 of this embodiment possesses illuminating part 11 and the some brightening circuit 12 that is used to this illuminating part 11 is lighted.

Illuminating part 11 constitutes, and comprising: 1 the LED element 11a that is electrically connected with above-mentioned some brightening circuit 12, and with and this LED element 11a between be provided with voids state cover this LED element 11a and 1 roughly Yellow luminous fluorophor 11b.And, to supply with based on electric power from a brightening circuit 12, illuminating part 11 is lighted roughly whitely.

Then, the spectral characteristic to the illuminating part 11 of the lighting device under the mesopic vision environment 10 describes.

The present inventor at first is conceived to the S/P ratio; This S/P ratio is meant, the ratio of the photopic vision brightness Lp that the spectral luminous efficiency V ' under the noctovision (λ) multiply by the dichroism of lamp and calculates and the noctovision brightness Ls that calculates and the spectral luminous efficiency V (λ) under the photopic vision multiply by the dichroism of lamp.And through evaluation experimental, how the energy of also having investigated each wavelength of illuminating part 11 influences this S/P ratio.In addition, S/P for example is being made as Ls with noctovision brightness than the performance evaluation index that is the visuognosis degree under the mesopic vision, photopic vision brightness is made as under the situation of Lp, can calculate the S/P ratio through following formula.

S/P ratio=Ls/Lp ... (formula 1)

Based on above-mentioned formula 1, investigation makes the energy of specific wavelength increase to what S/P change such as under 2 times the situation by every 5nm, and the result of this investigation is as shown in Figure 2.

Can know that according to Fig. 2 at this, become at the energy that for example makes the wavelength about 500nm under 2 times the situation, the S/P ratio has increased about 3.5%.Like this, can know according to Fig. 2 that when energy is increased, the S/P ratio being had the wavelength of forward (plus) effect is about 405nm～530nm, the degree that in about 470nm～505nm, plays positive acting especially uprises.On the other hand, for negative sense (minus) effect is arranged under the situation of about 535nm～680nm, the degree that in about 560nm～590nm, plays negative role especially is high at wavelength.In addition, near the about 520nm～545nm of positive acting about 530nm～535nm that negative role changes, it is steep that this changes gradient in conduct.

Based on The above results, the illuminating part 11 of the lighting device 10 of this embodiment has the spectral characteristic that first peak wavelength of illuminating part 11 (lighting device 10) shown in Figure 1 in the wavelength region may of about 470nm～505nm as shown in Figure 3 exists.And illuminating part 11 constitutes, make as shown in Figure 3 in the wavelength region may A of about 470nm～505nm first peak value and relative spectral intensity become roughly peer-level.In addition, among Fig. 3 with the relative spectral intensity of first peak wavelength as 1, relatively show the spectral intensity of each wavelength with respect to first peak wavelength.

Illuminating part 11 constitutes, and as shown in Figure 3ly outside the wavelength region may and above-mentioned about 470nm～505nm zone of about 405nm～530nm, spectral intensity is sharply reduced, and is about 20nm～40nm with respect to the half width at half maximum B of above-mentioned first peak wavelength.

And then illuminating part 11 constitutes, and as shown in Figure 3ly begins till wavelength C (about 530nm) from above-mentioned first peak wavelength; Spectral intensity is reduced; As the place of turning back, till wavelength D (about 555nm), spectral intensity is raise this wavelength C as second peak wavelength.At this moment, illuminating part 11 constitutes, and makes the spectral intensity of spectral intensity＞second peak wavelength of this first peak wavelength.And illuminating part 11 constitutes, and as shown in Figure 3ly begins to make till at least about 590nm luminous output (spectral intensity) to reduce from the wavelength D as second peak wavelength.

The characteristic effect of this embodiment then, is described.

(1) possess illuminating part 11, the peak wavelength of this illuminating part 11 is present between about 470nm～505nm, is about 20nm～40nm with respect to the half width at half maximum B of this peak value.Through such formation, as shown in Figure 2, the ratio that can improve efficiently for noctovision brightness and photopic vision brightness is the degree of influence of S/P ratio.Therefore, can improve visuognosis degree and lightness sense under the mesopic vision environment, the result can provide a kind of lighting device that can improve security, feel at ease to feel 10.

(2) illuminating part 11 has first peak wavelength that is present between about 470nm～505nm and compares second peak wavelength that is present in long wavelength's one side with about 530nm.Like this, make illuminating part 11 have second peak wavelength being in a ratio of long wavelength's one side with about 530nm, thus, the cone in people's the retina plays a role and can improve photopic vision brightness.Particularly, because second peak wavelength of illuminating part 11 is about 555nm, therefore can improve photopic vision brightness more reliably.

(3) illuminating part 11 constitutes, and in about 560nm～590nm of long wavelength's one side of second peak wavelength, luminous output reduces.Through such formation, especially there is in the wavelength region may of about 560nm～590nm of negative sense side effect its luminous output low at degree of influence to the S/P ratio, therefore can suppress degree of influence to the negative sense side to the S/P ratio, can improve S/P.

In addition, embodiment of the present invention can also carry out following such change.

In the above-described embodiment, between LED element 11a and fluorophor 11b, be provided with the space of regulation, but also can on LED element 11a, apply fluorophor.

In the above-described embodiment, constituted illuminating part 11 by 1 LED element 11a and 1 fluorophor 11b, but be not limited thereto, also can carry out suitable change according to specification etc.As the variation of the illuminating part of lighting 11 roughly whitely, such formation below also can considering.But,, then be not limited thereto so long as can be suitable for formation of the present invention.

For example, as shown in Figure 4, also can adopt following formation, that is: except 1 fluorophor 11b of 1 LED element 11a and this element of covering 11a, also possess peak wavelength and the different LED element 20 of above-mentioned LED element 11a.

In addition; As shown in Figure 5; Also can adopt following formation, that is: except 1 LED element 11a and 1 the fluorophor 11b that covers this element 11a, also possess roughly same LED element 21a of peak wavelength and above-mentioned LED element 11a and the fluorophor 21b different with above-mentioned fluorophor 11b.

In addition, as shown in Figure 6, illuminating part 11 is constituted, comprising: blue LED element 22a and cover the fluorophor 22b of this element 22a and burn red; Blue LED element 23a and cover the fluorophor 23b of this element 23a and glow green; And blue LED element 24.

In addition, as shown in Figure 7, illuminating part 11 is constituted, comprising: the LED element 26 of blue LED element 25, green and red LED element 27.

In addition, also can use transmission/diffusion optical filter to constitute illuminating part 11, adopt the formation that satisfies spectral characteristic for example shown in Figure 3.

In the above-described embodiment, show spectral characteristic shown in Figure 3, but, then can carry out suitable change as long as in satisfying the scope of each condition as the light source that satisfies each condition 10.

Claims

1. a lighting device is characterized in that,

Possess peak wavelength be present between about 470nm～505nm, with respect to the half width at half maximum of this peak value illuminating part for about 20nm～40nm.

2. lighting device according to claim 1 is characterized in that,

Above-mentioned illuminating part has first peak wavelength that is present between about 470nm～505nm and compares second peak wavelength that is present in long wavelength's one side with about 530nm.

3. lighting device according to claim 2 is characterized in that,

Second peak wavelength of above-mentioned illuminating part is 555nm.

4. according to claim 2 or 3 described lighting devices, it is characterized in that,

Above-mentioned illuminating part constitutes, and the spectral intensity of above-mentioned first peak wavelength is stronger than the spectral intensity of second peak wavelength.

5. according to claim 2 or 3 described lighting devices, it is characterized in that,

Above-mentioned illuminating part constitutes, and above-mentioned second peak wavelength be in a ratio of between about 560nm～590nm of long wavelength's one side, luminous output reduces.