GB2419936A

GB2419936A - LED Table lamp

Info

Publication number: GB2419936A
Application number: GB0520650A
Authority: GB
Inventors: John Se-Kit Yuen
Original assignee: John Manufacturing Ltd
Current assignee: John Manufacturing Ltd
Priority date: 2004-10-11
Filing date: 2005-10-11
Publication date: 2006-05-10
Anticipated expiration: 2025-10-11
Also published as: EP1645795A3; EP1645795A2; GB0520650D0; GB2419936B; HK1072163A2

Abstract

An table lamp having light-emitting diode. The lamp comprises housing with a front and a rear wall, a protective cover making up a part of the housing and including an optical component for focusing and scattering light from an LED to a required light strength. The lamp has an AC-DC converter that provides means of direct power from any outlets and charges an inserted lead acid chargeable battery. In the event of a power cut in direct operation of the converter, the inserted battery could be used as simultaneous emergency power for the product. A circuitry lowers down the main voltage to a level that activates the LED's. The lamp comprises an arm which has the LED's and is foldable connected to the housing.

Description

LED Table Lamp

BACKGROUND OF THE PRESENT INVENTION

Field of Invention

The present invention relates to an LED table lamp such as an LED table lamp with a rechargeable lithium ion battery which powers a simple lightemitting diode (LED) as a source of illumination. When LED light passes through a circuit board, it generates clear light.

Description of Related Arts

A conventional table lamp is often in a form of small, convenient and mobile "puck" lights. These puck light are so called because they are often round and can be mounted and moved with a minimum of effort. These lights generally utilize fluorescent or incandescent lamps as a light source. Fluorescent and incandescent lamps typically require filaments and cathode tubes for operation. As such, they are fragile and have a relatively short operating life. Furthermore, filament lamps are not the most economical to operate. In addition, by producing light by heating a filament, incandescent lamps generate a great deal of heat. This heat builds up and limits the effectiveness of a traditional nightlight due to safety considerations and the possibility of unintentionally and adversely heating items on countertops. This heat generation also makes traditional puck lights less versatile in that some places in which such a light would be desired cannot accommodate a large buildup of heat (e.g. closets, shelves, etc.). Moreover, traditional incandescent and fluorescent lights are quite inefficient. An incandescent light converts a large amount of energy to heat rather than light and fluorescent lamps have a relatively high start-up power consumption.

Accordingly, new ways to provide more efficient lighting are desired.

As disclosed in U.S. Patent No. 4,343,032, a nightlight generally consists of a base portion having prongs, which directly plug into a wall outlet. The base portion has a neck extension, which receives a small wattage bulb. A plastic shade or canopy fits over the bulb and such structure provides a nightlight which is very bulky.

White-light LED systems provide significant benefits over traditional fluorescent and incandescent lamps. As white-light producing LED systems become more refined and efficient, a need exists to expand the use of such systems into other areas, such as nightlights. Conventional fluorescent and incandescent lamps used in nightlight have multiple components (increasing the cost to manufacture), are fragile, and have a relatively short operating life.

U.S. Patent No. 6,641,283 discloses an illumination system which includes an LED module or housing and a mounting base. A plurality of LEDs are mounted on the module to serve as a light source and generate a light pattern. At least one optical assembly is operatively associated with the housing for focusing and dispersing the light pattern. The housing can be easily mounted and removed from the base unit to provide a flexible mounting architecture. However, again due to the base required by this LED illumination system, cost of production is higher and it is bulky in size.

U.S. Patent No. 6,648,496 provides a nightlight assembly including a wall plate adapted to fit over a switch plate extending from a substantially planar surface. The wall plate engages and abuts the substantially planar surface upon mounting the nightliglit in its final operating position. At least one light emitting diode (LED) is mounted within the wall plate, which serves as the light source for the nightlight. This patent suggests providing a slimmer nightlight but, due to the nature of conventional LEDs, a relatively short-time-life of such LED illumination remains an unsolved problem.

SUMMARY OF THE PRESENT INVENTION

A preferable object of the present invention is to provide an LED table lamp by utilizing a simple light-emitting diode (LED) as a source of illumination to provide a reliable lighting means.

Another preferable object of the present invention is to provide an LED table lamp by utilizing a simple light-emitting diode (LED) as a source of illumination and a simple light-emitting diode (LED) as a source of illumination. When LED light passes through a circuit board, it generates speeding clear light.

Another preferable object of the present invention is to provide an LED table lamp by eliminating all unnecessary components to a table lamp.

Accordingly, the present invention provides an LED table lamp, which comprises: a housing having a front panel and a back panel; a protective cover including an optical assembly for focusing and dispersing LED emitted light to a desired light contour enclosing at least a portion of the housing; at least one light-emitting diode (LED) as a illuminant; and a plurality of circuit boards with a plurality of polyester cover capacitors, a plurality of resistances, a plurality of metal power plug.

BRIEF DESCRIPTION OF THE DRAWINGS

A non-limiting preferred embodiment of the present invention will now be described with reference to the accompanying diagrammatic drawings, in which:- Figure 1 is a front view of an LED table lamp in accordance with a preferred embodiment of the present invention; Figure 2 is a front sectional view of the table lamp; Figure 3 is a plan sectional view of the table lamp; Figure 4 is a plan view of the table lamp; Figure 5 is an underneath view of the table lamp; Figure 6 is a rear view of the table lamp; Figure 7 is a side view of the table lamp; Figure 8 is another side view of the table lamp; Figure 9 is an isometric view of the table lamp; and Figure 10 is an exploded view of the table lamp.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to Figure 10, this LED table lamp has a housing consisting of a front or upper panel (1) and a back or lower panel (2). The panels have no predetennined shape. They can be rectangular, round or any other shape depending on any specification ordered. Left and right parts (3) of a fixed arm project upwards from said housing (1, 2). A handle (4) extends across the top of said housing (1, 2) from said fixed arm (3) at one side to the opposite side of said housing (1, 2) to enable the table lamp to be carried. A pivot (5) at the top of said fixed arm (3) supports a rotatable arm (6) which includes an elongate reflector plate (10) behind a strip of LEDs (12) on a circuit board and covered by a transparent front cover (11) . Said housing (1, 2) contains a lead acid rechargable battery (8) and a DC electric socket (9). An on/off switch (7) is affixed to said handle (4) . It passes through two holes in the two side portions of said handle (4) as said handle (4) is assembled and fixed in position between said fixed arm (3) and said upper panel (1).

The lead acid rechargable battery and the DC electric socket are installed within the master shield, and the switch on the handle bar. The upright arm and the rotation arm are connected by a revolving shaft. The reflector plate, the transparent front cover and the circuit board having twelve emitting diodes are installed onto the rotation arm.

As an AC-DC converter is plugged into an AC power socket, the output end of the converter is connected to the DC electric socket on the master shield. Push the switch down to directly drive the diodes to emit light. The light passes through the transparent plastic cover to cause the table lamp to give out light. Otherwise the converter charges the lead acid battery through an electric circuit in the master shield at the output end. After charging, the battery can be used as a direct power source. In the event of power failure during direct operation by the converter, the battery can provide power to the product as an emergency source. The intensity of light can be adjusted to alternative high and low intensities by a switching operation. The battery can provide continuous operation up to 32 hours at low light-intensity or 16 hours at high light- intensity.

Said LED wall plate nightlight provides an ability to adopt power source directly from any wall outlet of AC (alternating current), which is provided by any public utility provider. As electricity passes through said circuit board (9) inside of said front panel (1) and back panel (2), the 120 v AC is converted down to activate the light-emitting diodes to illuminate.

The LEDs are driven through a circuit board, and they generate clear white light which can remain stable over an extended period of time and will not be affected by any weather condition. The circuit board allows the light to form an evenly distributed glow. The electric circuit module includes a circuit board, a metal like polyester covering capacitor, two resistances, one diode and two light-emitting diodes.

It is the lifespan of said LEDs (12) to offer at least 100,000 light hours.

Therefore, said LED table lamp provides a relative longer usage than conventional nightlights.

Claims

1. An LED table lamp comprising: a housing; a protective cover including an optical assembly for focusing and directing LED emitted light to produce a desired light contour; and at least one light-emitting diode (LED) as a light source.

2. An LED table lamp according to Claim 1, further comprising: one or more circuit boards with a plurality of capacitors and a plurality of resistors; and one or more metal power plugs affixed on said circuit board.

3. An LED table lamp as recited in Claim 2, wherein said circuit board further comprises: a plurality of metal polyester covering capacitors, a plurality of resistors, and at least one diode and a plurality of lightemitting diodes.

4. An LED table lamp as recited in any preceding claim, wherein said LED table lamp has an ability to adopt as a power source any wall outlet of AC (alternating current), which is provided by any public utility provider.

5. An LED table lamp as recited in any preceding claim, wherein said housing comprises a front panel and a back panel.

6. An LED table lamp as recited in Claim 5, wherein said front panel has a display window with a predetermined size and shape, which contains a circuit board conforming with said predetermined size and shape of said hole.

7. An LED table lamp as recited in at least Claim 2, wherein, as electrical current passes through said metal power plug into circuitry that lowers down a mains voltage to a voltage level that activates said light-emitting diodes to emit light, said light passes through said circuit board, generates white light, and said circuit board allows light to form an evenly distributed glow, making it a safe and reliable way of illumination.

8. An LED table lamp comprising: a base housing which contains power circuitry connectable to an external power source, and preferably an internal battery rechargeable by the external power source and arranged to power the power circuitry in the absence of the external power source; a first arm extending upwardly from the base housing; and an adjustable second arm pivotably connected to an upper end of the first arm and including a circuit board which has one or more white-light emitting LEDs and is driven by the power circuitry, and an optical assembly for focusing and directing the LED-emitted light.

9. An LED table lamp according to Claim 8, wherein: the optical assembly comprises an elongate rear reflector and an elongate transparent front cover which extend along the second arm and between which is located an elongate arrangement of a plurality of the LEDs extending along the second arm.

10. An LED table lamp according to Claim 8 or 9, wherein: the second arm is foldable to a stowed position against the first arm.

11. An LED table lamp according to Claim 9 and 10, wherein: in the stowed position the transparent cover faces the first arm.

12. An LED table lamp according to Claim 11, wherein: the first and second arms are of substantially the same length and cross-section.

13. An LED table lamp according to Claim 12, wherein: the base housing has a rectangular base plate and a cover mounted on the base plate and containing the internal battery with a first corner of the base plate being left uncovered by the cover; a lower end of the first arm is fixed in position at the inner half of the uncovered first cover; and the free end of the second arm when folded to its stowed position occupies the outer half of the uncovered first corner.

14. An LED table lamp according to Claim 13, wherein the internal battery is symmetrically disposed about a diagonal line of the base plate passing through the first corner and does not occupy a second corner opposite to the first corner.

15. A circuit board for an LED table lamp, comprising: a plurality of metal power plugs, a plurality of metal polyester covering capacitors, a plurality of resistances, and at least one diode and a plurality of lightemitting diodes, arranged such that electrical current passes through said metal power plug into a circuitry that lowers down a mains voltage to a voltage level that activates said light-emitting diodes to emit light.

16. A circuit board for an LED table lamp as recited in Claim 15, wherein said circuit board has an ability to adopt as a power source any wall outlet of AC (alternating current), which is provided by any public utility provider.

17. An LED table lamp substantially as herein described with reference to, or with reference to and as illustrated in, the accompanying drawings.