Illumination Angle Adjusting Device and Illuminating Device Technical Field

The present invention relates to an illumination angle adjusting device and an illuminating device comprising the illumination angle adjusting device.

Background Art The spot light is a common illuminating device and widely used in, for instance, exhibition instruments.

In recent years, with the wide applications of LED lamps, LED lamp light sources also start to be used in spot lights. The spot light usually needs to be rotated to change an illumina- tion area. The traditional spot light has no problem in rotation, but an LED spot light has some problem in rotation. As a heat sink is needed for heat dissipation of the LED, the LED spot light will use aluminum alloy as the heat sink, then the LED spot light is heavier than the traditional spot light due to such heat sink. Therefore, an operator should rotate the whole heavy LED spot light when the rotating direction should be adjusted.

Summary of the Invention

The object of the present invention lies in providing an illumination angle adjusting device, with which an illumination area can be adjusted without rotating the whole spot light.

An illumination angle adjusting device for an illuminating device is provided according to the present invention, wherein the illuminating device comprises a light source, characterized in that the illumination angle adjusting device comprises a base accommodating the light source and a ro- tatable optical device mounted on the base and rotated with respect to the light source.

The present invention provides a rotatable optical device that is rotated with respect to the light source, so that an illumination region can be adjusted via rotation of the optical device. Moreover, a base is provided for arranging the rotatable optical device.

Preferably, the base is a reflective cup. As the base is a reflective cup, light incident on the base will be reflected to further emerge through the rotatable optical device, so that the optical efficiency is further improved. Preferably, the rotatable optical device comprises a lens. Consequently, the illumination area is adjusted via rotation of the lens .

Preferably, the lens is at least partially accommodated in the reflective cup, and is offset around a rotating axis lo- cated in a surface perpendicular to an optical axis of the light source. As a result, light in the reflective cup can emerge as much as is possible through the lens. By offsetting the lens around the rotating axis located in a surface perpendicular to the optical axis of the light source, dif- ferent orientations of the lens with respect to the optical axis can be adjusted, and further the illumination area is adjusted .

Preferably, the reflective cup is rotated with respect to the lens to jointly define an enclosed cavity for accommodating the light source, which thereby will assure light from the light source not to leak from the enclosed cavity, and further improves the optical efficiency.

Preferably, the reflective cup is a hemispherical body open- ing in a light-emitting direction, and the rotating axis of the lens is a diameter of the hemispherical body.

In one preferred solution of the present invention, the ro- tatable optical device comprises a trunnion, and the reflective cup has a hole on an edge of the reflective cup for ac- commodating the trunnion, therefore, the lens is rotated via support from the trunnion in the hole.

Preferably, the illumination angle adjusting device further comprises an adjusting piece anti-torsionally connected with the trunnions via the hole. Thereby, the rotation of the lens is adjusted by adjusting the adjusting piece.

Preferably, the reflective cup further comprises a protrusion on the edge of the reflective cup, and respective hole is opened in respective protrusion.

In one preferred solution of the present invention, the ro- tatable optical device further comprises a reflective region as a sidewall region around the lens. The reflective region can complementarily adjust the illumination area; accordingly, it is more flexible to adjust the illumination area by using the reflective region. The present invention further relates to an illuminating device, and specifically, a spot light. Preferably, the spot light is an LED spot light. Preferably, the illuminating device comprises a circuit board for arranging the light source and the base thereon. The present invention further relates to an exhibition instrument comprising the illuminating device .

The illumination angle adjusting device of the present appli- cation can adjust the illumination area by merely rotating the lens, and has the prominent advantage of convenient adjustment .

It shall be understood that both the above general description and the following detailed description are for illustra- tive and explanative purposes in order to provide further description of the claimed present invention.

Brief Description of the Drawings

Next, preferred embodiments according to the present invention will be illustratively described hereinafter with refer- ence to the figures. As shown in the drawings:

Fig. 1 is a 3D view of an illuminating device of one embodiment of the present invention;

Fig. 2 is a 3D view of an illumination angle adjusting device of one embodiment of the present invention; Fig. 3 is a local sectional view of an illumination angle adjusting device of one embodiment of the present invention;

Fig. 4 and Fig. 5 are schematic diagrams of rotation of a lens of an illumination angle adjusting device of one embodiment of the present invention; Fig. 6 shows an adjusting piece of an illumination angle adjusting device of one embodiment of the present invention; Fig. 7 is a sectional view of assembling an illuminating device of one embodiment of the present invention; and

Fig. 8a and Fig. 8b are comparative schematic diagrams of rotations of a lens with respect to a reflective cup in an il- lumination angle adjusting device of one embodiment of the present invention.

Detailed Description of the Embodiments

Fig. 1 is a 3D view of an illuminating device 100 of one embodiment of the present invention. The illuminating device 100 comprises a heat sink 16, a mounting ring 15 and other parts of the illuminating device 100 that are not shown in Fig. 1. The illuminating device 100 of the present invention differs from prior illuminating devices in that the illuminating device 100 of the present invention comprises an illu- mination angle adjusting device 10, in which a rotatable optical device 2 is arranged.

Fig. 2 is a 3D view of the illumination angle adjusting device 10 of one embodiment of the present invention. The rotatable optical device 2 comprises a lens, and preferably, can further comprise a reflective region 13 as a sidewall region around the lens 12. Besides, the illumination angle adjusting device 10 further comprises a base enclosing a light source 4. The base herein can be configured as a reflective cup 1. The lens 12 can be at least partially accommodated in the reflective cup 1 and is offset around a rotation axis 14 in a surface perpendicular to an optical axis of the light source 4. In other preferred embodiments, the reflective cup 1 is a hemispherical body opening in a light-emitting direction. The rotation axis 14 of the lens 12 is a diameter of the hemispherical body. Besides, the lens 12 comprises trun- nions 6, and the reflective cup 1 has holes 8 on an edge 7 of the reflective cup 1 for accommodating the trunnions 6, such that the lens 12 is rotatably supported on the reflective cup 1. The reflective cup 1 further comprises protrusions 9 on the edge 7 of the reflective cup 1, and respective hole 8 is opened in respective protrusion 9. For facilitating adjustment, the illumination angle adjusting device 10 further comprises an adjusting piece 11 anti-torsionally connected with the trunnion 6 via the hole 8. Fig. 3 is a local sectional view of the illumination angle adjusting device 10 of one embodiment of the present invention. It can be seen from Fig. 3 that the reflective cup 1 is rotated with respect to the lens 12 so as to jointly define an enclosed cavity 5 for accommodating the light source 4. Rotation of the reflective cup 1 with respect to the lens 12 is in an angle range that assures the enclosed cavity 5 to be enclosed to prevent light from leaking therefrom.

Fig. 4 and Fig. 5 are schematic diagrams of rotation of the lens 12 of the illumination angle adjusting device 10 of one embodiment of the present invention. The lens 12 is rotated around the rotating axis 14. As mentioned above, the rotating axis 14 is located in the surface perpendicular to the optical axis of the light source 4 or is a straight line on an opening edge of the reflective cup 1 passing through an opening center. It can be seen from Fig. 4 and Fig. 5 that the position of a center of the lens 12 is changed when the lens 12 is rotated.

Fig. 6 shows the adjusting piece 11 of the illumination angle adjusting device 10 of one embodiment of the present inven- tion. The adjusting piece 11, seen more clearly form Fig. 6, is configured for facilitating manual operations. Fig. 7 is a sectional view of assembling the illuminating device 100 of one embodiment of the present invention. The base of the illumination angle adjusting device 10 of the present invention, which is the reflective cup 1 in the pre- sent embodiment, is arranged on the circuit board 3, and a heat sink 16 is provided below the circuit board 3.

Fig. 8a and Fig. 8b are comparative schematic diagrams of rotations of the lens 12 with respect to the reflective cup 1 in the illumination angle adjusting device 10 in one embodi- ment of the present invention. It can be seen from Fig. 8a and Fig. 8b that the illumination area is adjusted after the lens 12 is rotated with respect to the base (which is the reflective cup 1 in the present embodiment) . Apart from the lens 12, the reflective region 13 as the sidewall region around the lens 12 also can serve a complementary function of adjusting the illumination area.

The above is merely preferred embodiments of the present invention but not to limit the present invention. For the person 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

100 illuminating device

10 illumination angle adjusting device 1 reflective cup

2 rotatable optical device

3 circuit board

4 light source

5 enclosed cavity

6 trunnion

7 edge of reflective cup

8 hole

9 protrusion

11 adjusting piece

12 lens

13 reflective region

14 rotating axis

15 mounting ring

16 heat sink