FIELD OF THE INVENTION
The present invention generally relates to led lamp apparatus, more particularly to a rotatable led lamp apparatus providing precise bi-directional rotation and uniform illumination from diffuser.

BACKGROUND OF THE INVENTION
LED or Light Emitting Diodes are a type of solid state lighting becoming preferred way of lighting across the globe due to associated advantages of energy efficiency, extended life, cold temperature operation etc. The popularity of LEDs in the lighting market and décor world has led to use of the LED light/bulb in different forms of lamps majorly characterized into linear and non-linear LED lamps.
[003] The demand for LED linear lamps is now huge and continues to grow. The linear architectural lighting and LED technology have broadened the applications of linear fixtures. The lighting industry continues to evolve with improvements in aesthetics and performance, moving away from the old, traditional housings.
[004] However, a problem associated with linear LED lamps is their alignment, even a small rotation/loosing with respect to holder may cause an unsymmetrical look which may poses problem both in terms of aesthetics and illumination. A further problem associated with the LED lamps of the prior arts is of non-uniform illumination. A number of LED lamps with rotation mechanism have been provided in the prior art. However, the lamps of the prior art fail to provide adequate and precise rotation and further also fail to provide uniform illumination.
[005] One such rotatable LED florescent lamp is disclosed in published Chinese utility model no. CN203731284U. However, the rotatable lamp of CN203731284U provides limited rotation, complex assembly and does not address the problem of non-uniform illumination at the edges. Published Chinese utility model no. CN203703842U also disclose a rotation limit mechanism for LED lamps, however the disclosed mechanism is complex to manufacture and use. Also, said Chinese
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utility model makes no addressal to the problem of non-uniform illumination at the edges. Another LED lamp is disclosed in the Chinese patent application no. CN103836404, alike the mentioned prior arts the LED lamp of CN103836404 fail to provide uniform illumination at the edges.
[006] Thus, there is a requirement of a LED lamp apparatus which provides precise bi-direction rotation with uniform illumination from diffuser.
OBJECTIVES OF THE INVENTION
[007] The primary objective of the invention is to provide a LED lamp apparatus that adapted to rotate in bi-direction.
[008] Another objective of the invention is to provide a LED lamp apparatus adapted for precise rotation.
[009] Yet another objective of the invention is to provide a LED lamp apparatus with uniform illumination throughout.
[010] Yet another objective of the invention is to provide a LED lamp apparatus that has simple construction, fewer parts and which is convenient to assemble.
SUMMARY OF THE INVENTION
[011] The present invention provides a LED lamp apparatus to attain the abovementioned objectives of the invention. In accordance with an embodiment of the present invention, there is provided a rotatable LED lamp apparatus comprising a housing base comprising a front end and a rear end, a diffuser adapted to be mounted on the front end of said housing base, a lamp holder, and a rotation assembly to rotatably couple the housing base with the lamp holder. In accordance with said embodiment, wherein said rotation assembly comprises of a base arrangement and a pinion.
[012] In accordance with said embodiment, base arrangement comprises of a cavity preferably in center of the rear end of the base housing, a base protrusion extending
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from the rear end of the base housing, and plurality of gear teeth arranged within the protrusion adjacent to periphery of the protrusion. In accordance with said embodiment, the shape of the cavity and protrusion is selected from the group of circle, square, hexagonal, pentagonal, rectangle, elongated rectangle, oval, triangular, star-shaped, trefoil shaped, trapezoid-shape, polygonal and the like.
[013] In accordance with said embodiment, shape of the pinion is complementary to the shape of the cavity.
[014] In accordance with said embodiment, the pinion comprises a front end and a rear end.
[015] In accordance with said embodiment, the front end of the pinion comprises a protrusion adapted to be received in the cavity of the base arrangement to secure attachment.
[016] In accordance with said embodiment, the rear end is adapted to secure attachment with the holder.
[017] In accordance with said embodiment, the pinion comprises a pinion tooth on the front end to mesh with the plurality of gear teeth to provide bi-directional rotation upon application of force in the desired direction.
[018] In accordance with said embodiment, the diffuser comprises an illuminating front end, top end and bottom end.
[019] In accordance with said embodiment, the diffuser cross section thickness gradually increases in a direction from center toward outer edges.
[020] In accordance with said embodiment, the diffuser height gradually decrease in a direction from center toward outer edges.
BREIF DESCRIPTION OF THE DRAWINGS
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[021] The following drawings are illustrative of preferred embodiment for enabling the present invention, are descriptive of some methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Figure 1: illustrates a perspective view of an exemplary rotatable LED lamp apparatus, according to the present invention.
Figure 2: illustrates an exploded view of an exemplary rotatable LED lamp apparatus, according to the present invention.
Figure 3: illustrates a perspective view of an exemplary rotatable LED lamp apparatus, according to the present invention.
Figure 4(a): illustrates a front view of an exemplary housing base, according to the present invention.
Figure 4(b): illustrates a rear view of an exemplary housing base, according to the present invention.
Figure 5(a): illustrates a perspective view of an exemplary diffuser, according to the present invention.
Figure 5(b): illustrates a perspective cross section view of an exemplary diffuser, according to the present invention.
Figure 6: illustrates a perspective view of an exemplary pinion, according to the present invention.
Figure 7(a): illustrates a top view of an exemplary base arrangement, according to the present invention.
Figure 7(b): illustrates a perspective view of an exemplary rotation assembly, according to the present invention.
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LIST OF REFERENCE NUMERALS
With regard to reference numerals used, the following numbering is used throughout the drawing.
(100) rotatable LED lamp apparatus
(10) housing base
(11) front end of hosing base
(12) rear end of housing base
(20) diffuser
(21) illuminating front end
(22) illuminating top and bottom end
(30) holder
(40) cavity
(41) base protrusion
(42) gear teeth
(43) pinion
(44) pinion front end
(45) pinion rear end
(46) pinion locking protrusion
(47) pinion tooth
DETAILED DESCRIPTION OF THE INVENTION
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[022] The preferred embodiments of the disclosed subject matter are described in more detail hereinafter with reference to the accompanying drawings. The disclosed subject matter may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, the exemplary embodiments are provided so that this disclosure is thorough and complete, and will convey the scope of the disclosed subject matter to those skilled in the art. Like reference numerals in the drawings denote like elements.
[023] It is to be noted that, as used in the specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be noted that the term “or” is generally employed in its sense including “and/or”, unless the content clearly dictates otherwise. It should also be noted that by the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, [021] [023] including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those skilled in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
[024] Hereinafter, a rotatable LED lamp apparatus will be explained in more detail. The same reference numerals are given to the same parts as those of the aforementioned embodiments and their minute explanation has been omitted.
[025] Figure 1 and 2 illustrate a rotatable LED lamp apparatus (100) according to the preferred embodiment of the present invention in assembled and exploded view respectively. The rotatable LED lamp apparatus (100) comprises of a housing base (10), a diffuser (20), a holder (30), and a rotating mechanism. The rotatable LED lamp apparatus (100) is adapted to rotate in bi-direction about the central axis (C) of the apparatus as depicted in Figure 3. According to a preferred embodiment the rotatable LED lamp apparatus (100) is adapted to rotate 320 ° around the central axis.
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[026] The components of the rotatable LED lamp apparatus (100) are hereinafter discussed in more detail. Figure 4 (a) illustrates front end (11) of the housing base (10) and figure 4(b) illustrates the rear end (12) of the housing base (10). The housing base (10) can be made up of any suitable material such as polycarbonate and the like and is preferably opaque. The housing base is adapted to house lamp driver, MCPCB (Metal Core PCB) and LED according to an embodiment of the invention. The housing base (10) further comprises of a base arrangement at the rear end (12), wherein the base arrangement comprises of a cavity (40), base protrusion (41) and plurality of gear teeth (42). The base arrangement is explained in detail below with reference to figure 7(a) and 7(b).
[027] Referring to figure 5(a) and 5(b), shown therein is the diffuser (20) according to the preferred embodiment of the invention. The diffuser (20) comprises of an illuminating front end (21), top and bottom end (22). The diffuser (20) has height (h) at the center. The height (h) gradually increases in a direction from center toward outer edges (E1, E2) which provides a curve diffuser. For uniform illumination throughout from diffuser, the diffuser cross section thickness gradually increases in a direction from center toward the outer edges.
[028] Referring to figure 6, shown therein is the pinion (43) according to the preferred embodiment of the invention. It comprises a pinion front end (44) and a pinion rear end (45). The pinion front end (44) facilitates rotatable attachment of the housing base (10) with the holder (30). The pinion (43) further comprises of a pinion locking protrusion (46). The pinion front end (44) is adapted to be received in the cavity (40) of the base arrangement (48) to secure attachment. The pinion locking protrusion (46) further comprises of a pinion tooth (47) to mesh with the plurality of gear teeth (42) to provide bi-directional rotation upon application of force in the desired direction.
[029] Referring to figure 7(a) and 7(b), shown therein is base arrangement (48) and locking assembly (50) according to the preferred embodiment of the invention.
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[030] The base arrangement (48) comprises of a cavity (40), base protrusion (41) and plurality of gear teeth (42). The cavity is preferably at the center of the rear end of the housing base. The cavity can be of any suitable shape preferably circular. The base protrusion is also preferred to be of circular shape, in accordance with the embodiment the diameter of the base protrusion (41) is greater than the diameter of the cavity (40).
[031] The base arrangement (48) further comprises of plurality of gear teeth (42) arranged within the protrusion adjacent to periphery of the protrusion (41) as depicted in figure 7(a). According to a preferred embodiment the base arrangement has more than 25 gear teeth (42) preferably 28 spaced 2.4 mm apart, the greater number of teeth facilitate precise rotation.
[032] Figure 7(b) illustrates the locking assembly (50) comprising the base arrangement and pinion as discussed in detail above.
[033] The above-described embodiment is merely exemplary illustrations of implementations set forth for a clear understanding of the principles of the invention. Variations, modifications, and combinations may be made to the above-described embodiment without departing from the scope of the claims. All such variations, modifications, and combinations are included herein by the scope of this disclosure and the following claims.

WE CLAIM:
1. A rotatable LED lamp apparatus (100) comprising:
 a housing base (10) comprising a front end (11) and a rear end (12);
 a diffuser (20) adapted to be mounted on the front end (11) of said housing base (10), wherein the diffuser comprises an illuminating front end (21), top end and bottom end (22) and gradually variable height and cross section thickness (t), wherein the cross section thickness (t) gradually increases in a direction from center toward outer edges (E1, E2);
 a lamp holder (30); and
 a rotation assembly (50) to rotatably couple the housing base with the lamp holder.
2. The rotatable LED lamp apparatus (100) as claimed in claim 1, wherein said rotation assembly comprises of a base arrangement and a pinion (43).
3. The rotatable LED lamp apparatus (100) as claimed in claim 2, wherein the base arrangement comprises of
 a cavity (40) preferably in center of the rear end (12) of the base housing (10),
 a base protrusion (41) extending from the rear end (12) of the base housing (10), and
 plurality of gear teeth (42) arranged within the protrusion adjacent to periphery of said base protrusion (41).
4. The rotatable LED lamp base apparatus (100) as claimed in claim 3, wherein the shape of the cavity (40) and protrusion (41) is selected from the group of circle, square, hexagonal, pentagonal, rectangle, elongated rectangle, oval, triangular, star-shaped, trefoil shaped, trapezoid-shape, polygonal and the like.
5. The rotatable LED lamp apparatus (100) as claimed in claim 2, wherein shape of the pinion (43) is complementary to the shape of the cavity (40).
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6. The rotatable LED lamp apparatus (100) as claimed in claim 2 or 5, wherein the pinion (43) comprises a pinion front end (44) and a pinion rear end (45).
7. The rotatable LED lamp apparatus (100) as claimed in claim 6, wherein the pinion front end (44) comprises a protrusion (46) adapted to be received in the cavity (40) of the base arrangement to secure attachment.
8. The rotatable LED lamp apparatus (100) as claimed in claim 6, wherein the pinion rear end (45) is adapted to secure attachment with the holder (30).
9. The rotatable LED lamp apparatus (100) as claimed in claim 2, 5 or 6, wherein the pinion (43) comprises a pinion tooth (47) to mesh with the plurality of gear teeth (42) to provide bi-directional rotation upon application of force in the desired direction.