WO2014056988A1

WO2014056988A1 - Illuminating device

Info

Publication number: WO2014056988A1
Application number: PCT/EP2013/071067
Authority: WO
Inventors: Jing Lin; Zhang LIU; Junhua Zeng; Tingbiao LAN
Original assignee: Osram GmbH
Current assignee: Osram GmbH
Priority date: 2012-10-10
Filing date: 2013-10-09
Publication date: 2014-04-17
Anticipated expiration: 2015-04-10
Also published as: CN103727415A

Description

Description Illuminating Device Technical Field

The present invention relates to an illuminating device. Background Art

A lamp designer usually will not consider the appearance of optical parts of the illuminating device designed, but puts emphasis on the optical performances of the optical parts.

As a result, a large number of optical parts having different mechanical shapes are designed, and these optical parts often are reflectors or lenses. However, when the illuminating de^¬ vice is observed, the interior of the illuminating device can be easily seen through these optical parts, for instance, even the light source itself can be seen. There are a lot of such monotonous illuminating devices with traditional appear^¬ ance available in the market. These illuminating devices themselves only have the illumination function, and when they are turned off, the optical parts in the interior of the il^¬ luminating device can be seen directly.

Summary of the Invention

In order to solve the above technical problem, the present invention provides an illuminating device. Such illuminating device has a good appearance, and when it does not operate, users cannot easily seen the interior of the illuminating de^¬ vice, moreover, the illuminating device also has other addi^¬ tional functions, such as use as a mirror. In addition, the illuminating device according to the present invention fur- ther has quite good optical distribution performance.

The object of the present invention is accomplished via an illuminating device. The illuminating device comprises a re^¬ flector and a light source, wherein the reflector defines an accommodation cavity having an opening, the light source is arranged in the accommodation cavity, and the opening is used as a light emergent opening of the light source, wherein the illuminating device further comprises an enclosing cover for enclosing the opening, the enclosing cover permits part of light among incident light to directly emerge through the en^¬ closing cover, and remaining light to be reflected to the re^¬ flector, and reflected again by the reflector to the enclos^¬ ing cover, and the remaining light is used to be incident light such that the incident light is incident on the enclos- ing cover in a degressive tendency. The enclosing cover used in the illuminating device according to the present invention only permits part of light to pass through the enclosing cover, thus, when a user observes the illuminating device, it is hard for him to see the interior of the illuminating de- vice through the enclosing cover. In addition, as the light emitted from the light source is cyclically reflected multi^¬ ple times between the reflector and the enclosing cover, an emergent angle of emergent light emitted is changed, which greatly improves the optical distribution performance of the light emitted from the illuminating device, such that the emergent light looks more uniform.

According to the present invention, the enclosing cover is configured to be semitransparent , wherein the semitransparent enclosing cover is capable of preventing interior of the ac- commodation cavity from being observed. Such semitransparent enclosing cover permits the light emitted from the illuminat^¬ ing device to be partially emergent and partially reflected, and also serves the same function for light from the outside; therefore, it is not easy for the observer to see the inte^¬ rior of the accommodation cavity of the illuminating device, improving the aesthetics of the illuminating device. Preferably, the enclosing cover is configured in such a man^¬ ner that 50% of light incident on the enclosing cover di^¬ rectly emerges through the enclosing cover and 50% of the light is reflected to the reflector. In this solution, the enclosing cover both can permit a small optical loss when the light transmits the enclosing cover and can effectively pre^¬ vent the observer from seeing the interior of the accommodation cavity of the illuminating device.

According to the present invention, the reflector is configured in such a manner that light reflected back by the en- closing cover is incident on the enclosing cover, after reflected by the reflector, at a changed incident angle. Dif^¬ fusive reflection effect is created for the light through co^¬ operative use of the reflector and the enclosing cover, thereby quite uniform optical distribution is obtained. Further according to the present invention, the enclosing cover has a first surface facing to the light source and a second surface facing to ambient environment, wherein the second surface is a planar surface. Since the enclosing cover itself is semitransparent and has certain reflective capability, the second surface can be used as a mirror, espe^¬ cially as a make-up mirror, when the second surface is a pla^¬ nar surface, especially when the illuminating device is in an off state.

Preferably, the enclosing cover is configured to be in a plate shape, wherein the first surface is parallel to the second surface. Such type of enclosing cover does not have a complex structure, and therefore it is more easily manufac^¬ tured, so that the manufacturing cost of the illuminating de^¬ vice is reduced. Preferably, the first surface and/or the second surface is coated or bonded with a semitransparent film. The semitrans- parent enclosing cover can be obtained just by simply coating or bonding a semitransparent film on the first surface and/or the second surface, which further decreases the manufacturing hardship of the enclosing cover.

According to the present invention, the reflector is configured as a holophote reflector. Light could be totally re^¬ flected by the so called holophote reflector but not re^¬ fracted by the same. Of course, designers also can choose other types of reflectors, such as diffuse reflector, accord^¬ ing to different illumination effects desired.

Preferably, the light source is an LED light source. The LED light source has the advantages of long service lifetime, high lighting efficiency and environmental friendliness. It is to be understood that the features of the various exem^¬ plary embodiments described herein may be combined with each other, unless specifically noted otherwise.

Brief Description of the Drawings

The accompanying drawings constitute a part of the present Description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention and are used to de^¬ scribe the principles of the present invention together with the Description. In the accompanying drawings the same components are represented by the same reference numbers. As shown in the drawings :

Fig. 1 is a schematic section diagram of an illuminating de- vice according to the present invention;

Fig. 2 is a principle schematic diagram of the illuminating device according to the present invention;

Fig. 3 is an optical pathway diagram of light reflected by the illuminating device according to the present invention; and

Fig. 4 is a schematic diagram of the illuminating device ac^¬ cording to the present invention used as a mirror.

Detailed Description of the Embodiments

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, direc^¬ tional terminology, such as "front", "back", "inner",

"outer", is used in reference to the orientation of the fig- ures being described. Because components of embodiments of the present invention can be positioned in a number of dif^¬ ferent orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

Fig. 1 is a schematic section diagram of an illuminating device 100 according to the present invention. It can be seen from the figure that the illuminating device 100 comprises a reflector 1 and a light source 2, wherein the reflector 1 defines an accommodation cavity 11 having an opening 12, and the light source 2 is arranged in the accommodation cavity 11. In the present embodiment, the light source 2 is config^¬ ured as an LED light source and is arranged right in a center of a bottom of the accommodation cavity 11, and the reflector 1 is configures as a holophote reflector, and of course, the reflector 1 also can be configured as a diffuse reflector ac^¬ cording to requirements. It can be seen from the figure that the opening 12 is used as a light emergent opening of the light source 2, wherein the illuminating device 100 further comprises an enclosing cover 3 for enclosing the opening 12, wherein the enclosing cover 3 is configured to be semitrans- parent, and the semitransparent enclosing cover 3 can prevent the interior of the accommodation cavity 11 from being ob- served. It can be seen from the figure that the enclosing cover 3 has a first surface 31 facing to the light source 2 and a second surface 32 facing to ambient environment, wherein the second surface 32 is a planar surface. In the present embodiment, the enclosing cover 3 is configured to be in a plate shape, the first surface 31 is parallel to the second surface 32, wherein the first surface 31 and/or the second surface 32 is coated or bonded with a semitransparent film so as to form the semitransparent enclosing cover 3. The enclosing cover 3 permits part of light among incident light to directly emerge through the enclosing cover 3, and the remaining light to be reflected to the reflector 1, and then again reflected by the reflector 1 to the enclosing cover 3, and part of light among the remaining light to di- rectly emerge through the enclosing cover 3 such that the incident light is incident on the enclosing cover 3 in a de^¬ gressive tendency.

In order simply illustrate the operation principle of the il- luminating device 100 of the present invention, Fig. 1 merely shows an optical pathway diagram of one beam of light re^¬ flected by LED chips. Further explanations and illustrations will be made in reference to the principle schematic diagram of the illuminating device according to the present invention shown in Fig. 2. In the present embodiment, the enclosing cover 3 is configured in such a manner that 50% of light in^¬ cident on the enclosing cover 3 directly emerges through the enclosing cover 3, and 50% of light is reflected to the re^¬ flector 1. In reference to Fig. 2, in an ideal situation that optical loss is not taken into consideration, assume that incident light of IT is incident on the enclosing cover 3, and then 50% of the light, i.e. 0.5T of the light, di^¬ rectly emerges through the enclosing cover 3, and 50% of light is reflected by the enclosing cover 3 to the reflector 1. The reflector 1 reflects the 0.5T of light to the enclos^¬ ing cover 3, at which time 0.25T of light directly emerges through the enclosing cover 3, and 0.25T of light is reflected by the enclosing cover 3 to the reflector 1. The light is cyclically reflected and emerges in a degressive tendency. Thus, such type of semitransparent enclosing cover 3 can achieve certain mirror effects due to certain reflec^¬ tive capability so as to be used as a mirror. Moreover, it is not easy for an observer to see the interior of the illu^¬ minating device 100 when the illuminating device 100 does not operate.

Fig. 2 shows an optical pathway diagram of light reflected by the illuminating device 100 in an ideal situation. The re- flector 1 in Fig. 2 has a structural profile different from that in Fig. 1, such that light reflected to the reflector 1 is incident on the enclosing cover 3, after reflected by the reflector 1, at a changed incident angle. Diffusive reflec- tion effect is created for the light through cooperative use of the reflector 1 and the enclosing cover 3, thereby quite uniform optical distribution is obtained. Fig. 3 shows a complete optical pathway diagram of the illuminating device 100 according to the present invention, from which it can be seen that the light emitted from the illuminating device 100 according to the present invention has more uniform optical distribution .

Fig. 4 is a schematic diagram of the illuminating device 100 according to the present invention used as a mirror. When the illuminating device 100 does not operate, that is, it does not emit light, when a user observes the illuminating device 100, light is incident on the semitransparent enclos^¬ ing cover 3 from ambient environment, wherein 50% of the light passes through the enclosing cover 3 to strike the in- terior of the illuminating device 100, the reflector 1 deflects this part of light to another direction and prevents this part of light, in cooperation with the enclosing cover 3, from entering user's eyes, and 50% of light will be re^¬ flected to the user's eyes, thus, the user can see a rela- tively clear image of himself or the ambient environment on the enclosing cover 3. Moreover, the semitransparent enclos^¬ ing cover 3 prevents the user from seeing the interior of the illuminating device 100 to a great extent, so as to serve a good function of shielding internal structures of the illumi- nating device 100.

The above is merely preferred embodiments of the present in^¬ vention but not to limit the present invention. For the per- son skilled in the art, the present invention may have vari^¬ ous alterations and changes. Any alterations, equivalent substitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.

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List of reference signs

1 reflector

11 accommodation cavity

12 opening

2 light source

3 enclosing cover

31 first surface

32 second surface

100 illuminating device

Claims

An illuminating device (100), comprising a reflector (1) and a light source (2), the reflector (1) defining an accommodation cavity (11) having an opening (12), the light source (2) is arranged in the accommodation cavity

(11), and the opening (12) is used as a light emergent opening of the light source (2), characterized in that the illuminating device (100) further comprises an enclosing cover (3) for enclosing the opening (12), the enclosing cover (3) permits part of light among incident light to directly emerge through the enclosing cover

(3) , and remaining light to be reflected to the reflec^¬ tor (1), and reflected again by the reflector (1) to the enclosing cover (3) , and the remaining light is use to be incident light such that the incident light is inci^¬ dent on the enclosing cover (3) in a degressive tendency .

The illuminating device (100) according to Claim 1, characterized in that the enclosing cover (3) is config^¬ ured to be semitransparent, the semitransparent enclos^¬ ing cover (3) is capable of preventing interior of the accommodation cavity (11) from being observed.

The illuminating device (100) according to Claim 1 or 2, characterized in that the enclosing cover (3) is config^¬ ured in such a manner that 50% of light incident on the enclosing cover (3) directly emerges through the enclos^¬ ing cover (3) and 50% of the light is reflected to the reflector ( 1 ) .

The illuminating device (100) according to Claim 1 or 2, characterized in that the reflector (1) is configured in such a manner that light reflected back by the enclosing cover (3) is incident on the enclosing cover (3) , after reflected by the reflector (1), at a changed incident angle .

5. The illuminating device (100) according to Claim 1 or 2, characterized in that the enclosing cover (3) has a first surface (31) facing to the light source (2) and a second surface (32) facing to ambient environment, and the second surface (32) is a planar surface.

6. The illuminating device (100) according to Claim 5,

characterized in that the enclosing cover (3) is config^¬ ured to be in a plate shape, and the first surface (31) is parallel to the second surface (32) .

7. The illuminating device (100) according to Claim 5,

characterized in that the first surface (31) and/or the second surface (32) is coated or adhered with a semi- transparent film.

8. The illuminating device (100) according to Claim 1 or 2, characterized in that the reflector (1) is configured as a holophote reflector.

9. The illuminating device (100) according to Claim 1 or 2, characterized in that the light source (2) is an LED light source.