1. Field of the Invention
The present invention relates to a lighting system and more particularly, a cold cathode lighting system.
2. Description of the Related Art
Cold cathode lighting is commonly used as an indirect light source that provides a very appealing glow that evenly wash adjacent surfaces & or objects such as walls, ceiling, book cases, furniture, etc. It is used for many different interior and exterior architectural applications. It is used as hidden light source in coves accentuate corner transition between walls and ceilings. In any application it can be used as decorative, supplemental and or functional lighting.
Other light sources that are used in cove lighting systems include in part hot cathode fluorescent lamps, incandescent lamps, PL lamps and LED. The following lists why these lamp configurations have many disadvantages.
Hot cathode fluorescent lamps are only sold in standard straight sizes and not easily made to conform to curves in a cove. They come in limited colors and are not easily made to be dimmable. The lamps cannot be illuminated end to end. They have a relatively short life span.
Incandescent lamps are not energy efficient. Their lifespan is short and need replacement often. A row of bulbs does not produce smooth continuous glow of illumination.
PL lamps also produce uneven illumination. They cannot be dimmed easily and come in only a few colors. They have short life spans.
LED standard output systems for coves have very low light out levels and have a very limited choice of colors.
Cold cathode lighting has many advantages by comparison. Cold cathode lighting has a much longer life span then other light sources. Each lamp illuminates from end to end with no socket interruption and positioned with a small fraction of space between each lamp end resulting continuous shadow free illumination. The lamps can be easily made curved to fit any shape cove and are dimmable. They come in a multitude of colors. There are additional advantages when using low voltage cold cathode lighting systems in that individual fixtures can be produced to achieve the same advantages as mentioned above.
Cold cathode lamps are commonly constructed from 3 tubular glass sections that are fused together. The first tubular glass section is the main body which produces end-to-end illumination. The main body can be produced in almost any specified length that are straight or formed to match the contours of the lamps mounting surfaces such as curved and angular building surfaces. Cold cathode lamps bodies have a maximum length of 8′ and cross sectional diameter ranging from 18 mm to 25 mm. The second tubular glass section is a pair of electrodes, each of which are located on both of the furthermost ends of the lamp body. The third tubular glass section is fused between the electrode and main body as means to extend the distance and orientation of the electrode in relation to the main body as required. Various orientations of the electrodes are required to accommodate the range of configurations including right angles, bend backs, double right angles, etc., that are dictated by different devices including prior art. These devices have been developed to insulate, cover, support, interconnect and/or other related requirements to assist in protecting the electrode from being damaged and/or causing any electrical safety hazards. The electrode is the means for transferring electricity from an external power source through the interior of the lamp between the electrodes to produce the necessary power to excite and illuminate gases such as argon mercury vapor. The construction of each electrode includes leads that are hermetically sealed so that they can extend from the interior of the lamp to its exterior through tip of the electrode. There are various means to safely and securely assist in the continuity between the connection of the electrode leads and electrical wire that originate from the required power source. Depending upon the type of said power source they can be located remotely at varying distances such as 10′, 20′, 30′ or more with the intent that the power sources must still be positioned as close to the cold cathode lamps as possible.
Other types of power sources are located in close proximity of the cold cathode lamps in various types of metal casings that commonly support the main body of the cold cathode lamp mention above. There is an industry standard designation between these two types of power sources used for cold cathode lamps, based on output voltage. The two designations are a) high voltage over 1000 volts such as a high voltage magnetic transformer each of which commonly operate as many as 10 lamps and b) low voltage power source under 1000 volts such as an electronic power supply sometimes referred as a ballast each of which commonly operates one lamp.
Advantages for using low voltage cathode lighting is that it is much safer and therefore complies to the NEC for use in residential applications, whereas high voltage systems are not allowed. Low voltage cathode lighting provides the ability to produce individual fixtures that include one or more casings that support the cold cathode lamp. These fixtures can be prefabricated, eliminating the need to ship separate components to be installed in the field, which is one of the disadvantages for high voltage cold cathode lighting systems. Each low voltage cathode light fixture includes one or more power supply to energize one cathode lamp. There is one cold cathode lamp per fixture. Low voltage cold cathode lighting has a much longer life span then other light sources. The lamps evenly illuminate from end-to-end with no socket interruption. Therefore each lamp can be positioned with a small fraction space between each lamp end, resulting in even, shadow-free illumination. The lamps can be easily curved to fit any cove shape and are dimmable.
There are various devices used to insulate, cover, support, interconnect and/or other related requirements to assist in protecting the cold cathode lamp electrodes from being damaged and/or causing any electrical safety hazards. However what all of these devices have in common is that they all fall short in avoiding damage or breakage of the electrodes as intended. The components of these devices have not been produced to be foolproof from damaging the electrode, tubular extension &/or main lamp body. Such damage can be caused by twisting, applying tension or compression resulting in direct fractures, or tiny hairline cracks, [generally during installation?]. All of which will cause the lamps to become inoperable. The cathode lamp components that have these drawbacks are cold electrode receptacles commonly called lamp holders, polymeric insulator boots, glass insulator cups, double right angle electrode lamp base, amongst others. These drawbacks are described below.
Disadvantages to the right angle orientation are that the lamp is pushed into an electrode receptacle or lamp holder, forcing it until it makes positive contact between the ferrule or button shaped electrode. The lamp can break and cause injury. The lamp also extends out of the lampholder high into the cove requiring a higher cove lip to hide the lamp.
A bend back orientation is where the electrode extension is bent and returns the electrode to the same parallel position as the main glass lamp. A glass cup can be used in place of the polymeric boot, but is large and bulky and requires a clip to keep it from slipping off and is extremely difficult to attach to a mounting surface so that it is positioned correctly.
Glass insulator cups have to manually twist the wire from the power source to the electrode leads and then manually cover that connection with a polymeric boot for insulation with a risk of breakage from the resistance when force is applied.
The disadvantage to a double right angle bend back that uses a bridge support between the main body of lamp and electrode is that physical force has to be applied with the hand to mount it to a contact located at the end of a metal mounting enclosure.
In an embodiment of the invention, a lighting system is disclosed, with a unique method of connecting a cold cathode lamp to electrode covers that properly insulate and securely interconnects the electrical wire from the power source to the lamp electrode in a manner that eliminates any pressure, torque, stress that could damage or break the electrodes.
In this embodiment, a low voltage cold cathode lamp is utilized. This lamp has electrodes on either end of the lamp oriented such that it includes an electrode extension in order to return the electrode to the same parallel position as the main body of the lamp. This electrode configuration is practical and simple to produce for those familiar with producing cold cathode lamps compared to other electrode configurations.
This lighting system has two sliding access doors (called casing cover end segments) with U shaped notches on the outboard edges. They may be slid into the open position to allow for the insertion of the lamp's electrodes, at both ends. The sliding access doors slide in a linear motion and to a controlled position. This controlled position is to accommodate precise alignment and spacing for the lamp electrode tip to be seated and engaged properly.
An electrode cover assembly is located in the interior of the casing below the sliding access door. This assembly includes a base that supports the electrode cover and interfaces with a track in order to properly slide back the electrode cover in a linear motion to the exact position required. The electrode cover consists of a ceramic insulator in the shape of a cylinder that is open on one end to allow the entry of the lamp's electrode. The electrode cover includes an internal electrical contact spring that interconnects with a metal cap that is located at the tip of the lamp's electrode. The base that supports the electrode cover is attached to a spring or alternate tensioning device. The base automatically retracts the electrode cover to its proper position for insertion of the electrode when the sliding door is moved to the open position. The base support of the electrode cover slides along a rail or track as the sliding door is opened in order to maintain the correct alignment when the electrodes are positioned in the interconnect location below the sliding door.
After the lamps electrodes are in position, the base of the electrode covers automatically slide towards the electrode as the sliding doors are being closed. The electrode cover gently engages the electrode and the electrode contact interconnects with the electrode cap. Thereafter, the lamp is ready for operation.
The positioning and engaging of the electrode cover with the lamp's electrode is accomplished without applying any force pressure, torque, or stress that could damage or break the cold cathode lamp and/or the electrodes, both of which would cause the lamp to be inoperable. Further, during the process of positioning the cold cathode lamp and electrodes there is no requirement to physically handle or manipulate any components necessary for interconnecting power to the said electrodes. This is also advantageous for the reverse operation and removal of the lamps and electrodes.
In an alternate assembly, a small portion of the top cover, known as the detachable casing cover segment, is disengaged from the lower housing and removed from the casing at opposing ends of the system. This open space now allows the end access covers (or casing cover end segments) with the attached electrode cover assemblies to be slid into said vacated space. The electrode cover assemblies can now interface with the lamp electrodes as above and slide within integral tracks located on the underside of the above mentioned end covers.
A more complete appreciation of the invention and many of the advantages thereof will be readily obtained as the same becomes better understood by reference to the detailed description when considered in connection with the accompanying drawings, wherein:
a is a perspective view of the hybrid lighting system of
b is a perspective view of the hybrid lighting system of
c is a perspective view of the hybrid lighting system of
d is a perspective view of the hybrid lighting system of
The flexible lighting system 200700 have flexible raceway hoses 260760 and is comprised of multiple casings. The casings may be arranged to allow for other than a straight-line lamp to accommodate the specific requirements for architectural conditions in which they are being used.
In these embodiments, the power supply generally sits in the middle of the lighting system, and is covered by a power supply access panel. This power supply access panel can be seen in 135 in
The lighting system in all of the present embodiments accommodate a cathode lamp 110 with its electrodes 320 connected through a bend back 310 on both ends. The electrodes 320 are terminated with an electrode cap 330. A casing cover end segment 170240 may be slid open so that the electrode 320 may be inserted into the lighting system. The sliding casing cover end segment has a thumb/pull screw 160250, that may be used to fasten the segment in the closed position, and may also serve as a knob in order to slide the segment manually open. The upper box 140230 incorporates two opposing horizontal tracks for the casing cover end segment 170240 to slide along.
There is a track 340 attached to the lower box 150 that provides a linear path for the U Chamber 360 to move along. The electrode cover 350 has one end fitted within the U chamber 360. There is a U chamber end plate 370 that extends beyond the upper (top) portion of the U chamber 360, such that it is in the path of the push back screw 180 attached to the casing cover end segment 170. The U chamber end plate 370 and U chamber 360 are known as electrode cover adapters, since they attach to the electrode cover for various functional purposes. As the casing cover end segment 170 slides into the open position, the push back screw 180 travels towards the U chamber end plate 370. As the casing cover end segment 170 continues sliding open, the push back screw 180 will come in contact with the U chamber end plate 370, pushes the U chamber end plate 370. This force causes the attached U chamber 360 and electrode cover 350 to slide inward along the track 340, putting the U chamber 360 and electrode cover 350 in their retracted position. While in this retracted position, the cold cathode lamp 110 with the lamp electrode 320 facing down towards the lamp light system can be inserted through the opening left by the retracted casing cover end segment 170.
As discussed earlier,
An exploded view of an end of the mini flexible fixture 700 end is shown in
a, 13b, 13c, and 13d demonstrate the removal of the lamp 1110. In
Referring back to the exploded view in
There is a post 1210 attached to the underside of the casing cover end segment 1130 and is centered between the opposing “L” shaped tracks of the casing cover end segment 1130. This post 1210 acts as a stop to prevent the U chamber 1220 from sliding out of the track and becoming disengaged.
In
The present invention has been described in an illustrative manner. It is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation. While there have been described herein, what are considered to be preferred and exemplary embodiments of the present invention, other modifications of the invention shall be apparent to those skilled in the art from the teachings herein and, it is, therefore, desired to be secured in the appended claims all such modifications as fall within the true spirit and scope of the invention.
This patent application claims the benefit of, priority of, and incorporates by reference U.S. Non-Provisional patent application Ser. No. 13/275,275 by Eric K. Zimmerman filed on Oct. 17, 2011, which in turns claims the benefit of U.S. Provisional Patent Application Ser. No. 61/394,346, entitled “Cold Cathode Light Fixture” by Eric K. Zimmerman filed on Oct. 18, 2010.
Number | Date | Country | |
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61394346 | Oct 2010 | US |
Number | Date | Country | |
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Parent | 13275275 | Oct 2011 | US |
Child | 13564709 | US |