Patent Grant
9163798
[Not Applicable]
[Not Applicable]
[Not Applicable]
Generally, the present application relates to flameless candles. Particularly, the present application relates to techniques for illuminating an outer surface of a candle shell in a flameless candle.
Flameless candles may have candle shells that include wax or a waxen material. As used herein, a waxen material encompasses wax, a wax substitute, or similar materials. The waxen material may allow the flameless candle to appear more like a conventional flamed candle. While the waxen material may provide such benefits, it can be relatively expensive.
Because a flameless candle does not consume the wax, it may not be necessary to have a candle body that is solid. Instead, it may be preferable to have a hollow interior region within the candle body, such as a candle shell. Such a design requires less material. An electronics insert, including a lamp such as a light-emitting diode (“LED”), may then be inserted into the candle shell and at least partially into the interior region.
One desirable effect of a flameless candle is to provide an illusion of a conventional flamed candle. The conventional flamed candles are, typically, solid wax. As discussed above, flameless candles may have a hollow interior region. Consequently, the illumination pattern of a conventional candle may differ from that of a flameless candle with a hollow interior region. An example of an illumination pattern in a prior art flameless candle with a hollow interior region is illustrated in
One known technique for influencing the illumination pattern of the outer surface of a flameless candle is to place a light-blocking barrier between the hollow interior region and the light source. Such a technique is shown in European Patent No. 1,419,345. However, this technique is intended to block substantially all of the light from entering into the hollow interior region of the flameless candle. Consequently, this technique may not effectively illuminate the outer surface to generate the illusion of a solid wax candle. Thus, it may be desirable to have a flameless candle that solves these and other problems.
According to embodiments of the present invention, a flameless candle is claimed, depicted, and described. The candle has a hollow interior region, an inner surface having an radius, and an outer surface having an outer radius. The candle also has a riser located within the hollow interior region. A lamp (e.g., LED) is also located in the interior region and above the riser. A light shield is located within the hollow interior region. The light shield is below the lamp and has an outer bound with a radius. The light shield also has a sloped portion. The top surface of the light shield may be reflective. The radius of the outer bound of the light shield is less than the radius of the inner surface of the candle shell. The sloped portion of the light shield slopes downwardly towards the outer bound.
The candle shell may have an outer surface with an upper region at a height above the light shield and a lower region at a height below the light shield. The riser, the lamp, and the light shield are configured to shape an illumination pattern on the outer surface of the candle shell. The illumination pattern may have a focal band and a tapered band. As an example, the light shield can configured to shape the tapered band through selection of the slope of the sloped portion. The shaping can also be made by adjusting the width of the space between the outer bound of the light shield and the inner surface of the candle shell. The light shield may also be configured to shape the focal band through selection of the slope of the sloped portion.
In an embodiment, the flameless candle has a base portion configured to support the riser. The base portion may have an electronics portion that provides current to the lamp. The electronics portion may cause the lamp to flicker like a candle flame. In another embodiment, there is a simulated wick above the lamp (e.g., directly above the lamp).
According to embodiments of the present invention, a light shield is claimed, depicted, and described. The light shield is adapted for use within a hollow region of a flameless candle. The light shield has an outer bound having a radius. It also has an inner aperture having a height greater than a height of the outer bound. The inner aperture can accommodate a plurality of conductors for the LED. The light shield also has a sloped region between the inner aperture and the outer bound. The radius of the outer bound is less than a radius of an inner surface of the hollow region of the flameless candle. This forms a space between the outer bound of the light shield and the inner surface of the hollow region. The shape of the light shield can be selected to shape an illumination pattern that will project onto the outer surface of the flameless candle. For example, the light shield can shape a tapered band and a focal band in the illumination pattern. In an embodiment, the light shield has a reflector. In another embodiment, the light shield can mount on a riser.
The foregoing summary, as well as the following detailed description of certain embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purposes of illustration, certain embodiments are shown in the drawings. It should be understood, however, that the claims are not limited to the arrangements and instrumentality shown in the attached drawings. Furthermore, the appearance shown in the drawings is one of many ornamental appearances that can be employed to achieve the stated functions of the system.
The candle shell 110 may include an external surface with an upper region 112 and a lower region 114. The upper region 112 may be at a height above the light shield 140. The lower region 114 may be at a height below the light shield 140. The candle shell 110 may further include an interior region 116, which may be generally hollow. The candle shell 110 may further include a well 118. The simulated wick 170 may be located within the well 118. The candle shell 110 may include an opening on the bottom. The opening and the interior region 116 may be configured to accept the base 150, riser 120, lamp 130, and light shield 140.
The base 150 may support the riser 120. The light shield 140 and lamp 130 may be supported by the riser 120. A plurality of conductors may be inside or run alongside the riser 120. The plurality of conductors may provide electrical current to the lamp 130. Another illustrative example of the base 150, a riser 120, lamp 130, and light shield 140 is also shown in
Turning back to
The electronics may include an illumination circuit designed to illuminate the lamp 130. For example, an illumination circuit could be designed to vary the current flowing through the lamp 130 to cause the lamp 130 to approximate the behavior of a real candle flame. An illumination circuit could be implemented by one or more oscillator circuits and/or a microprocessor. As an example, the illumination circuit could be two or more oscillator circuits, each of which are capable of operating at different frequencies and/or phases. In this example, the sum of the outputs of the oscillation circuits could be employed to variably control the current flowing through the lamp 110, thereby creating a flickering illusion of a real candle flame. As another example, the illumination circuit may be a microprocessor executing one or more algorithms.
The light shield 140 may have an outer bound that is circular. The light shield 140 may have an outer bound with other shapes, such as a square, oval, etc. The light shield 140 may have a conical shape. The light shield 140 may have a sloped portion 142. The sloped portion 142 may slope downwardly towards the outer bound of the light shield 140. In an embodiment, the sloped portion 142 may be horizontal. In another embodiment, the sloped portion 142 may slope upwardly.
If the sloped portion 142 slopes downwardly, it may facilitate the manufacturing process of a flameless candle. For example, one manufacturing technique involves the use of hot glue which has a relatively low viscosity when hot. First, the candle shell 110 is turned upside down. Hot glue is poured into the interior region 116. A sub-assembly (e.g., the base 150, riser 120, lamp 130, and light shield 140) is then inserted into the hollow region 116. The candle shell 110 is then flipped right-side up. The hot glue then flows down the walls of the hollow region 116 and onto the base 150 where a seal is made once the glue cools. If the sloped portion 142 slopes downwardly, then the dripping hot glue may run off and down onto the base 150. Thus, a downwardly sloping sloped portion 142 may facilitate funneling the hot glue towards desirable locations and away from undesirable locations.
The upper surface of the light shield 140 may include a material that is reflective or a reflector. The light shield 140 may be configured and located to reflect light emitted from the lamp 130 and/or reflected from the inner surface of the candle shell 110. The light shield 140 may have in inner aperture to pass the conductors to the lamp 130. The light shield 140 may be configured to mount on the riser 120. In an embodiment, the light shield 140 may be mounted on the riser 120 when the light shield 140 and riser 120 are formed together.
Turning back to
Some light, however, can pass through the space between the light shield 140 and the interior surface of the candle shell 110. By selecting the shape, radius 164, and slope 142 of the light shield 140, it may be possible to control how light enters into the lower area of the interior region 116 and how light is reflected into the upper area of the interior region 116.
As shown in
The illumination pattern 180 may also be shaped to create unconventional effects. For example, a flameless candle may have a design located on the outer surface of the candle (or embedded or located on the candle in some other manner). The light shield 140 may be tailored to have dimensions that create a focal band 182 to customize or emphasize the illumination of such a design.
Generally speaking, the introduction of the light shield 140 will cause light to be more concentrated in the upper region 112 and less concentrated in the lower region 114 of the outer surface of the candle shell 110, as compared to a flameless candle without a light shield.
By changing the width of the space between the outer bound of the light shield 140 and the inner surface of the candle shell 110 (see, e.g.,
The illumination pattern 180 of the focal band 182 can also be changed by adjusting the slope of the sloped portion 142 of the light shield 140 and the size of the space between the outer bound of the light shield 140 and the inner surface of the candle shell 110. By increasing the slope, the focal band 182 may be lowered and broadened. By reducing the slope, the focal band 182 may be higher and compressed. Additionally, because the size of the space has an impact on how much light passes below the light shield 140, the size of the space may have an effect on the intensity of the light in the focal band 182 and may broaden the focal band 182.
Other factors may also influence the illumination pattern 180 on the outer surface of a flameless candle 100. Such factors include the height of the lamp 130, the brightness of the lamp 130, the radiation pattern of the lamp 130, the height of the light shield 140 with respect to the lamp 130, the thickness of the candle shell 110, the size of the hollow region 116, the reflectivity of the light shield 140, or the like.
While the invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. For example, using the techniques described herein, other aspects of the illumination pattern 180 may also be shaped, such as the tapering region above the focal band 182. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
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