The present invention relates to an illuminating device. Background Art

As everyone knows, LED illumination has irreplaceable advan ^¬ tages, such as energy saving, low power consumption, and electrical-to-optical conversion efficiency near to 100%. It can save no less than 80% energy and has a longer service lifetime compared with the traditional light source with the same illuminating efficiency. In view of the above advan ^¬ tages, the LED is used more and more as a light source such as a lot of LED retrofit lamps available in the market. Such LED retrofit lamps have the same appearance and profile as the traditional light source such as incandescent lamp, thus they can be more applicable to the existing illuminating sys ^¬ tems as a light source. LED has been widely used in current illuminating device.

With the technology development, LED package itself can reach high efficiency, such as 1401m/W for cold white and 901m/W for warm white and they are supposed to have a long lifetime as to 50,000 hours, but when the LED is integrated into a retrofit lamp together with an LED driver, a thermal management device and an optical component, the efficiency and the service lifetime of the retrofit lamp are highly dependent upon how to design the driver, the heat sink device and the optical component. Some of the electrical power consumed in the LED is converted to heat rather than light. According to statistics of U.S. Department of Energy, 75% to 85% of energy used to drive the LED is converted to heat, and the heat must be conducted from the LED die to the underlying PCB and heat sink device. If the heat cannot be conducted timely, the light output performance of the LED will be reduced and a color shift will be produced in a short term, and the service lifetime of the LED will be shortened in a long term.

Various heat sinks have been designed in order to improve the heat dissipating capability of the illuminating device. How- ever, for the sake of industrial protection, the LED is usu ^¬ ally arranged in a housing of the illuminating device or in a enclosed space of the heat sink, but the space between the lens and the circuit board bearing the LED is small, and ef ^¬ fective air convection cannot be carried out in this space, thus, heat exchange between the LED as heat source and the outside is hindered, which reduces the heat dissipating per ^¬ formance of the illuminating device to a great extent, and further reducing the efficiency and the service lifetime of the illuminating device. Summary of the Invention

In order to solve the above technical problems, the present invention provides an illuminating device. The illuminating device in accordance with the present invention can particu ^¬ larly well perform air convection with the environment and has excellent heat dissipating performance.

The object of the present invention is accomplished with an illuminating device. The illuminating device comprises: a base, the base comprises a partition board dividing the base into a first accommodating cavity and a second accommodating cavity; a circuit board having light sources and arranged in the first accommodating cavity; and an optical assembly ar ^¬ ranged at an opening end of the first accommodating cavity, wherein the partition board, the circuit board and the opti ^¬ cal assembly each have at least one air communication struc- ture to enable air from environment to flow into the first accommodating cavity and the second accommodating cavity. In solutions of the present invention, air from the environment can form an air communication passage, running through the whole illuminating device, by the air communication struc- tures formed on the partition board, the circuit board and the optical assembly, so that heat from the light sources can be directly brought outwardly by convective air from inside of the illuminating device and the object of improving the heat dissipating performance of the illuminating device is achieved.

In accordance with one preferred solution of the present in ^¬ vention, the air communication structure of the partition board is configured as first openings, the air communication structure of the circuit board is configured as second open- ings, and the air communication structure of the optical as ^¬ sembly is configured as third openings, wherein the first openings, the second openings and the third openings form at least one air communication passage. By directly forming openings on the partition board, the circuit board and the optical assembly, the convective air can be enabled to di ^¬ rectly flow into the inside of the illuminating device, so as to bring away heat from heat sources of the illuminating de ^¬ vice. In addition, such simple opening configuration reduces the manufacturing difficulty of the illuminating device.

Preferably, the first openings and the second openings are configured as slots extending radially, respectively. Such slots reduce resistance of air when flowing inside the illu minating device to a great extent, and accelerate speed of air flow, as a result, the speed of heat exchange is enhanced and the heat dissipating performance of the illuminating de ^¬ vice is further improved. Advantageously, the first openings and the second openings have the same size. Since the circuit board should be dis ^¬ posed on the partition board in practical assembling, no pro ^¬ jection hindering air flow is present between the first openings and the second openings that have the same size, which decreases the resistance of air when flowing inside the illu ^¬ minating device and accelerates the speed of air flow and further the speed of heat exchange, and improves the heat dissipating performance of the illuminating device.

Preferably, the third openings are configured as holes, wherein respective first opening and respective second open ^¬ ing is assigned to at least two third openings. Since the third openings configured as holes are opened on the optical assembly, and the optical assembly directly faces the outside environment, small holes can prevent, to some extent, exter- nal pollutants from flowing into the inside of the illuminat ^¬ ing device. In addition, in solutions of the present inven ^¬ tion, the first opening, the second opening and the third opening in the same air communication passage should be on the same straight line, that is to say, they are aligned with each other. The convective air from the environment can pass through these openings in sequence and will not be blocked, which accelerates the speed of air flow, and improves the heat exchange capability and the heat dissipating perform ^¬ ance . In accordance with another preferred solution of the present invention, the circuit board is configured to comprise a plu- rality of first blade portions, the light sources are ar ^¬ ranged on the first blade portions, and the air communication structure of the circuit board is configured as first cuts between the first blade portions. In addition, the optical assembly is configured to comprise a plurality of second blade portions, and the air communication structure of the optical assembly is configured as second cuts between the second blade portions, wherein the first cuts and the second cuts have the same size, and the second blade portions are enclosed by the first blade portions, respectively, to define enclosed spaces for accommodating respective light sources. In the present solution of the present invention, a plurality of independent closed spaces is defined by the optical assem ^¬ bly and the circuit board, and each enclosed space is ar- ranged with at least one light source. Heat emitted from these light sources will not interfere other light sources. Moreover, such configuration of independent enclosed spaces elevates the industrial protection level of the illuminating device of the present invention. At the same time, the con- vective air from environment can directly flow through a cut defined by one first cut and one second cut formed between adjacent enclosed spaces and bring away heat generated by the light sources in respective independent enclosed spaces.

Preferably, the air communication structure of the partition board is configured as first openings extending radially, the first openings, the first cuts and the second cuts form at least one air communication passage, through which, air from the environment can further flow into the second accommodat ^¬ ing cavity of the illuminating device so as to bring away heat emitted from the heat sources in said accommodating cav ^¬ ity.

Optionally, third cuts are opened on a base wall of the base defining the first accommodating cavity, and the third cuts extend from the opening end of the base to the partition board. In solutions of the present invention, angular posi ^¬ tions of the third cuts in a circumferential direction of base are corresponding to angular positions of the respective first openings in the circumferential direction, thus, air from the environment can more freely flow into between the first cuts and the second cuts in a lateral direction of the base wall, which improves the air convection capability and the heat dissipating effect of the illuminating device in ac ^¬ cordance with the present invention.

Preferably, the base is configured as a housing or a heat sink of the illuminating device, the optical assembly is lens, and the light sources are LED chips. 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 compo ^¬ nents are represented by the same reference numbers. As shown in the drawings :

Fig. 1 is an exploded schematic diagram of a first embodiment of an illuminating device in accordance with the present in ^¬ vention ;

Fig. 2 is a cross-sectional view of the illuminating device as shown in Fig. 1; Fig. 3 is an exploded schematic diagram of a second embodi ^¬ ment of the illuminating device in accordance with the pre ^¬ sent invention; and

Fig. 4 is a cross-sectional view of the illuminating device as shown in Fig. 3.

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 "top", "bottom", "front", "back", "laterally", is used in reference to the orientation of the figures 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 an exploded schematic diagram of a first embodiment of an illuminating device 100 in accordance with the present invention. It can be seen from Fig. 1 that the illuminating device 100 in accordance with the present invention com ^¬ prises: a base 1, the base 1 comprises a partition board 13 dividing the base 1 into a first accommodating cavity 11 and a second accommodating cavity 12 (see Fig. 2); a circuit board 2 having light sources 21 and being arranged in the first accommodating cavity 11: and an optical assembly 3 ar ^¬ ranged at an opening end of the first accommodating cavity 11, and wherein the partition board 13, the circuit board 2 and the optical assembly 3 each have at least one air commu- nication structure to enable air from environment to flow into the first accommodating cavity 11 and the second accom ^¬ modating cavity 12. In the present embodiment, the air commu ^¬ nication structure of the partition board 13 is configured as first openings 131, the air communication structure of the circuit board 2 is configured as second openings 22, and the air communication structure of the optical assembly 3 is con ^¬ figured as third openings 31, wherein the first openings 131, the second openings 22 and the third openings 31 form at least one air communication passage. In addition, it can be seen from Fig. 1 that the first openings 131 and the second openings 22 are configured as slots extending radially. The first openings 131 and the second openings 22 have the same size. In a situation of completing practical assembling, since the circuit board 2 is placed on the partition board 13, the first opening 131 and the second opening 22 actually jointly form one opening with each other, and since the first openings 131 and the second openings 22 are configured as slots, flowing resistance of convective air inside the illuminating device 100 is reduced as much as is possible, accelerating the flowing speed of the convective air and improving the heat exchanging capability.

In addition, in the first embodiment shown in Fig. 1, the third openings 31 formed on the optical assembly 3 are con ^¬ figured as holes. In the present embodiment, one first open- ing 131, one second opening 22 and two third openings 31 form one air communication passage, that is to say, each first opening 131 and each second opening 22 in each air communica- tion passage are correspondingly provided with two third openings 31. These third openings 31 configured as holes, on one hand, satisfy requirements of convective air flowing into or flowing out from the inside of the illuminating device 100, and on the other hand, prevent external pollutants from flowing into the inside of the illuminating device 100 to some extent, because it is hard for external pollutants to pass through the small-sized holes to flow into inside of the illuminating device 100. Of course, in order to further im- prove the convective capability of the illuminating device 100 in accordance with the present invention, each first opening 131 and each second opening 22 also can be corre ^¬ spondingly provided with more third openings 31, e.g. three or four third openings 31. In the first embodiment of the illuminating device 100 in ac ^¬ cordance with the present invention as shown in Fig. 1 and the second embodiment of the illuminating device 100 in ac ^¬ cordance with the present invention as further described in Fig. 3, the base 1 is configured as a housing of the illumi- nating device 100, and of course, the base 1 also can be con ^¬ figured as a heat sink of the illuminating device 100 accord ^¬ ing to requirements, the optical assembly 3 is configured as lens, and the light sources 21 are configured as LED chips, and of course, the light sources 21 also can be other types of light sources, such as Xenon lamp or halogen lamp. The above specific definitions of the base 1, the optical assem ^¬ bly 3 and the light sources 21 are merely used to help under ^¬ standing the present invention without limiting the technical solutions of the present invention. Fig. 2 is a cross-sectional view of the illuminating device 100 as shown in Fig. 1. It can be seen clearly from said cross-sectional view the positional relations between various components in an assembled state of the illuminating device 100. The circuit board 2 arranged with the light sources 21 is directly arranged on the partition board 13 formed in one piece with the base 1. The second openings 22 formed on the circuit board 2 and the first openings 131 formed on the par ^¬ tition board 13 are aligned with each other, respectively. In addition, third openings 31 are opened on the optical assem ^¬ bly 3, wherein each of the first openings 131 and each of the second openings 22 are corresponding to two third openings 31. Further, it can be seen from arrows in Fig. 2 flowing directions of air. Convective air from environment flows into the second accommodating cavity 12, and then passes through the first openings 131 on the partition board 13 and the sec ^¬ ond openings 22 on the circuit board 2 to flow into the first accommodating cavity 11. The convective air brings away heat dissipated from the light sources 21 in the first accommodat ^¬ ing cavity 11 and discharges the same to external environment through the third openings 31 on the optical assembly 3. Cer ^¬ tainly, the convective air also can flow in a reverse direc- tion, i.e. the convective air flows into the first accommo ^¬ dating cavity 11 from the third openings 3, and then passes through the second openings 22 and the first openings 131 to flow into the second accommodating cavity 12, and further is discharged into the external environment. Fig. 3 is an exploded schematic diagram of a second embodi ^¬ ment of the illuminating device in accordance with the pre ^¬ sent invention. It can be seen from Fig. 3 that the circuit board 2 is configured to comprise a plurality of blade por ^¬ tions 23 similar to structure of fan blade, the light sources 21 are arranged on the first blade portions 23, and the air communication structure of the circuit board 2 is configured as first cuts 24 between the first blade portions 23. The op ^¬ tical assembly 3 is configured to comprise a plurality of second blade portions 32, and the air communication structure of the optical assembly 3 is configured as second cuts 33 be ^¬ tween the second blade portions 32. The optical assembly 3 in accordance with the present invention is configured as lens as mentioned in the preceding. The cross section of the opti ^¬ cal assembly 3 is configured to be blade-shaped, as a result, the optical assembly 3, as viewed on the whole, comprises a plurality of blade portions 32 having a certain thickness. In addition, it can seen further from Fig. 3 that the first cuts 24 and the second cuts 33 have the same size, and the second blade portions 32 are enclosed by the first blade portions 23, respectively, so as to define enclosed spaces for accom ^¬ modating respective light sources 21. In the present embodi ^¬ ment, the lens as the optical assembly 3 actually comprises a top surface and a circumferential wall extending from edges of the top surface, so that a cover-shaped structure is formed. The first blade portions 23 actually close the cover- shaped opening end of the optical assembly 3, so that en ^¬ closed spaces are formed. It can be seen further from Fig. 3 that the air communication structure of the partition board 13 is configured as first openings 131 extending radially. Said first openings 131 have no difference from the first openings 131 in the embodiment as shown in Fig. 1. In the present embodiment, respective first opening 131 has a profile matching that of respective first cut 24 and that of respective second cut 33, so that the first openings 131, the first cuts 24 and the second cuts 33 form a smooth air communication passage. Moreover, third cuts 111 are formed on a base wall of the base 1 defining the first accommodating cavity 11, and the third cuts 111 extend from the opening end of the base 1 to the partition board 13. angular positions of the third cuts 111 in a circumferential direction of base are corresponding to angular positions of the respective first openings 131 in the circumferential di ^¬ rection, thus, after the optical assembly 3 is mounted into the first accommodating cavity 11 of the base 1 of the illu ^¬ minating device 100, a mouth of a groove jointly formed by the first cut 24 and the second cut 33 of the optical assem ^¬ bly 3, opened to the base wall, will not be blocked by the base wall to further hinder air flowing.

Fig. 4 is a cross-sectional view of the illuminating device as shown in Fig. 3. It can be seen from Fig. 4 that the lens as the optical assembly 3 is buckled with the circuit board 2 so that a plurality of independent enclosed spaces are formed between the optical assembly 3 and the circuit board 2. The light sources 21 are arranged in said enclosed spaces, re ^¬ spectively. In an assembled state, the optical assembly 3 is completely inserted into the first accommodating cavity 11 of the base 1, and the first openings 131, the first cuts 24, the second cuts 33 and the third cuts 111 are aligned with each other, respectively, so as to form a smooth air communication passage. Arrows in Fig. 4 show a flowing direction of the convective air, that is to say, the convective air from environment flows into the second accommodating cavity 12, and then passes through the first openings 131 to flow into between the first cuts 24 and the second cuts 23, and is dis ^¬ charged upwardly and laterally passing though the third cuts 111. Of course, the flowing direction of the convective air also can be reversed. The illuminating device 100 in accor ^¬ dance with the present embodiment not only has good heat dis ^¬ sipating performance but also has high industrial protection level . 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. Although specific embodiments have been illustrated and de ^¬ scribed herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equiva ^¬ lent implementations may be substituted for the specific em- bodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific em ^¬ bodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equiva- lents thereof.

List of reference signs

1 base

II first accommodating cavity

III third cut

12 second accommodating cavity

13 partition board

131 first opening

2 circuit board

21 light source

22 second opening

23 first blade portion

24 first cut

3 optical assembly

31 third opening

32 second blade portion

33 second cut

100 illuminating device