CA1065392A - Encapsulated neon lamp module - Google Patents
Encapsulated neon lamp moduleInfo
- Publication number
- CA1065392A CA1065392A CA264,528A CA264528A CA1065392A CA 1065392 A CA1065392 A CA 1065392A CA 264528 A CA264528 A CA 264528A CA 1065392 A CA1065392 A CA 1065392A
- Authority
- CA
- Canada
- Prior art keywords
- module
- contacts
- movable
- stationary
- terminals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
- H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements
Landscapes
- Push-Button Switches (AREA)
Abstract
Abstract of the Disclosure A light module comprises several neon lamps and resistors encapsul-ated in a translucent plastic material. Terminals accessible for impressing a voltage across the lamps are also provided. Preferably the lamps are pro-vided on one side of a printed circuit board and the resistors on the other.
Neon lamps do not generate as much heat as incandescent lamps and can thus be more closely confined without burning out than incandescent lamps. The use of several neon lamps introduces a redundancy feature which permits the device to operate satisfactorily even if one lamp burns out. The encapsula-tion protects the lamps, resistors and connections generally in handling. In a particular application, the encapsulated module operates as the light source in a push button elevator call switch, the module being movable and transmitting a manually applied force to the movable contacts.
Neon lamps do not generate as much heat as incandescent lamps and can thus be more closely confined without burning out than incandescent lamps. The use of several neon lamps introduces a redundancy feature which permits the device to operate satisfactorily even if one lamp burns out. The encapsula-tion protects the lamps, resistors and connections generally in handling. In a particular application, the encapsulated module operates as the light source in a push button elevator call switch, the module being movable and transmitting a manually applied force to the movable contacts.
Description
This invention relates to light modules and, more particularly, to light modules which can be used effectively to illuminate confined areas such as are present in push button switches.
Historically, all illuminated push buttons and small illuminated signs and devices have used incandescent lamps. Because of the heat these lamps produce they often have to be spaced from the symbol, such as a floor number in the case of an elevator call switch, they have to illuminate thus increasing the size of the device. Particularly because of the confined spaces in which these lamps have to operate the lamps tend to burn out quickly necessitating frequent replacement at high labor cost and incon-venience to the user.
These problems could be reduced by reducing the lamp voltage but this, naturally, reduces the illumination which could be problematic when the device is intended to operate in a brightly lit environment such as an elevator lobby.
In known push button switches which provide illumination of the button the lamp is stationarily mounted at the bottom of the switch assembly with push button actuator and contact carrier being movable above it.
Because of this arrangement holes must be provided in the bottom of the switch housing and the contact carrier to permit light to reach the push button. Furthermore, access to the lamp for replacement is difficult.
It is an object of the present invention to obviate or mitigate the above disadvantages.
According to the broadest aspect of the present invention, there is provided a compact light module for use with normal electrical utility supply voltage, the module comprising an assembly of a plurality of miniature neon lamps and resistors and two terminals, the lamps and resistors being connected to the terminals to provide a plurality of circuits connected permanently across the terminals, each circuit comprising a neon lamp and a resistor, the assembly being encapsulated in a rigid translucent plastics material through which the terminals project for connection to the supply voltage.
f . ~1, ~065392 Figure 1 is an exploded perspective view of a switch assembly incorporating a module embodying the in~ention;
-la-Figure 2 is a side assembled view of the switch assembly of Pigure l;
Pigure 3 is a circuit diagram showing the components and inter-connections in the module; and Pigure 4 is a side view of the module prior to encapsulation.
With reference firstly to Pigures 3 and 4, a module 1 comprises a substrate 2 carrying on one side thereof four neon lamps 3 and on the other side four resistors. The substrate 2 is, in this embodiment, a printod circuit board (PCB) having conductors on the underside of the board. The upper side of the board, i.e. the side bearing the lamps should preferably be light in colour, e.g. white. The leads 5 of the neon lamps pass through the substrate and are soldered to conductors of the PCB as are leads 6 of the resistors. The reference numeral 7 indicates such soldered connections.
Two metal tabs 10 project perpendicularly from the underside of the PCB, the tabs being provided at opposite edges of the PCB. Each tab has a tapped through hole 11. Alternatively the tabs may simply be formed with flat contact portions.
Tho interconnections of tho lamps, resistors and tabs can be soon in Figure 3 from which it is clear that each lamp 3 is serially con-nected to a respective 70 K.ohm resistor, thus forming four parallel branches each connected across the tabs 10.
The assembly of Figure 4 is then encapsulated in a clear, water-white casting resin such as the resin sold under the trade mark CANVS
C-32 to obtain the modular block 14 shown in Pigure 1. The encapsulation is carried out using a mould which ensures that there are two holes (not shown) provided in opposite surfaces of the dule 14 and registering, respectively, with the tapped holes 11 in the tabs 10. In the alternative arrangement the holes are provided in the bottom of the module and register with the flat contact portions.
Figures 1 and 2, which illustrate a switch assembly, show a typical application of the module 14. The switch assembly is a modification of the type used in calling elevators, and includes a plastic base portion 15 upon which the other components are assembled. The base 15 is generally U-shaped and carries two pairs of stationary contacts 16 and 17 projecting upwardly from the bight. The contacts are formed on two pairs of terminsl posts 18 and 19 which project through the material of the base downwardly from the bight. Another pair of terminal posts 20 project downwardly from the base 15.
A central boss 21 is formed centrally on the upper surface of the bight of the base 15 and two flat projections 22, are formed in opposed legs 23 of the base 15. Flange portions 24 projecting laterally from the top of the legs each have a through hole 25.
A contact carrier 28 is formed as a generally rectangular plastic plate having recesses 29 on two opposet edges. Two pairs of contacts 30 and 31 are carried on the underside of the carrier 28 for mating, respect-ively, with the contacts 16 and 17. The contacts 30 are formed at opposite ends of a slightly rosilient conductive strip 32 mounted on the underside of the carrier, ant the contacts 31 are similarly formed on a strip 33.
~ne ond of a helical compression spring 34 is unted centrally to the undersido of the carrier 28 and the other end of the spring is received round tho boss 21 on the base 15.
Tho carrior 28 is arranged to move to and from the base, the projections 22 being received in the recesses 29 and acting as guides.
The spring 34 normally urges the carrier away from the base but the carrier can be moved against the action of the spring 34 so that the contacts 30 and 31 engage, respectively, the contacts 16 and 17 to bridge each pair of contacts 16 and 17.
The light module 14 rests on the upper surface of the contact carrier 28. Two leads 36 are connected to the tabs 10 of the module by means of screws 37 received through ring terminals 38 and the tapped holes 11. The other ends of the leads 36 are connected by means of ring terminals 39 to the respective terminal posts 20. In the alternative configuration of the tabs, spring loaded contacts connected to the posts 20 replace the leads 36, the contacts engaging the flat tab portions of the module.
A transparent plastic cup 40 having a rim 41 around its open end is received over the top of the module 14. The cap 40 carries on its downward facing surface a number designating a floor.
An inverted generally U-shaped housing member 42 has a rectangular hole 43 extending through the bight of the U. The legs 44 of the member 42 each have a through hole 45, the holes 45 registering respectively with the holes 25 on the base 15.
A trim member 47 has a rectangular channel portion 48 and a per-ipheral flange 49, the flange having two through holes 50. The trim member is dimensioned to rest on the member 44 with the flange 49 abutting the bight of the member 44 and a portion of the rectangular channel 48 projecting through the hole 43. The holes 50 register with the holes 45 and 25.
The cap 40 is received in the lower end of the rectangular channel 48, the rim 41 abutting the lower edges of the channel 48 to limit upward sliding movement of the cap 41 relative to the channel 48. Two long screws 51 are received through holes 50, 45, and 25 and cooperate with nuts (not) shown to maintain the components in assembled condition.
As can be seen in Figure 2, the coil spring 34 acts on the underside of the contact carrier 28 to urge the contact carrier 28, module 14 and cap 40 upwardly. The downwardly facing surfaces 53 of the legs 44 of housing member 42 overlap the legs 23 of base 15 to define stops limiting upward movement of the contact carrier 28. Upward movement of the module 14 and cup 40 is limited, as indicated above, by abutment of the rim 41 with the channel 48. In this position, the contacts 30 and 31 are remote from the contacts 16 and 17, respectively.
On depressing temporarily the top of the cap 40, the cap together with the module 14 and contact carrier 28 are depressed causing momentary bridging of the contacts 16 by contacts 30 and of the contacts 17 by contacts 31. The termdnal posts 18, 19 and 20 would be connected in a conventional manner to the elevator control circuitsy so that this momentary bridging of the contact pairs 16 and 17 would summon the elevator and cause 110 volts to be applied to terminals 20 to illuminate the module 14.
If one or two of the neon lamps were to burn out the module would still give sufficient light at least under some environmental conditions.
If it is necessary to replace the module this can easily be done simply by removing the screws 51 and 37.
It is to be noted that a standard size module can be used effect-ively with various conventional trims 47 having different sized channel portions 48 and caps 40 providing the cap is big enough to fit over the end of the module.
Instead of using the modules as push-button actuators as described above, they may convienently be used to illuminate numbers or other indicia on an indicator board, such as an elevator indicator board.
Although, the module 14 has been described, in the above embodi-ment, as being encapsulated, it is envisaged that the module would operate effectively without encapsulation in the simple role as a stationasy light sou~ce. Moreoves, the module could be used as a push-button without encap-sulating it; it could for example be contained in a stainless steel container having perforations to allow illumination.
It should be noted that the gsouping of the neon lamps provides a high level of illumination with practically no generation of heat.
This pesmits close tolerances and pesmits the light source to be located vesy close or in contact with the symbol to be illuminated, thus reducing the overall size of the device.
The encapsulated module, whether os not in a push button switch, can be used in particular environments whese open bulbs and contacts may be hazardous.
Historically, all illuminated push buttons and small illuminated signs and devices have used incandescent lamps. Because of the heat these lamps produce they often have to be spaced from the symbol, such as a floor number in the case of an elevator call switch, they have to illuminate thus increasing the size of the device. Particularly because of the confined spaces in which these lamps have to operate the lamps tend to burn out quickly necessitating frequent replacement at high labor cost and incon-venience to the user.
These problems could be reduced by reducing the lamp voltage but this, naturally, reduces the illumination which could be problematic when the device is intended to operate in a brightly lit environment such as an elevator lobby.
In known push button switches which provide illumination of the button the lamp is stationarily mounted at the bottom of the switch assembly with push button actuator and contact carrier being movable above it.
Because of this arrangement holes must be provided in the bottom of the switch housing and the contact carrier to permit light to reach the push button. Furthermore, access to the lamp for replacement is difficult.
It is an object of the present invention to obviate or mitigate the above disadvantages.
According to the broadest aspect of the present invention, there is provided a compact light module for use with normal electrical utility supply voltage, the module comprising an assembly of a plurality of miniature neon lamps and resistors and two terminals, the lamps and resistors being connected to the terminals to provide a plurality of circuits connected permanently across the terminals, each circuit comprising a neon lamp and a resistor, the assembly being encapsulated in a rigid translucent plastics material through which the terminals project for connection to the supply voltage.
f . ~1, ~065392 Figure 1 is an exploded perspective view of a switch assembly incorporating a module embodying the in~ention;
-la-Figure 2 is a side assembled view of the switch assembly of Pigure l;
Pigure 3 is a circuit diagram showing the components and inter-connections in the module; and Pigure 4 is a side view of the module prior to encapsulation.
With reference firstly to Pigures 3 and 4, a module 1 comprises a substrate 2 carrying on one side thereof four neon lamps 3 and on the other side four resistors. The substrate 2 is, in this embodiment, a printod circuit board (PCB) having conductors on the underside of the board. The upper side of the board, i.e. the side bearing the lamps should preferably be light in colour, e.g. white. The leads 5 of the neon lamps pass through the substrate and are soldered to conductors of the PCB as are leads 6 of the resistors. The reference numeral 7 indicates such soldered connections.
Two metal tabs 10 project perpendicularly from the underside of the PCB, the tabs being provided at opposite edges of the PCB. Each tab has a tapped through hole 11. Alternatively the tabs may simply be formed with flat contact portions.
Tho interconnections of tho lamps, resistors and tabs can be soon in Figure 3 from which it is clear that each lamp 3 is serially con-nected to a respective 70 K.ohm resistor, thus forming four parallel branches each connected across the tabs 10.
The assembly of Figure 4 is then encapsulated in a clear, water-white casting resin such as the resin sold under the trade mark CANVS
C-32 to obtain the modular block 14 shown in Pigure 1. The encapsulation is carried out using a mould which ensures that there are two holes (not shown) provided in opposite surfaces of the dule 14 and registering, respectively, with the tapped holes 11 in the tabs 10. In the alternative arrangement the holes are provided in the bottom of the module and register with the flat contact portions.
Figures 1 and 2, which illustrate a switch assembly, show a typical application of the module 14. The switch assembly is a modification of the type used in calling elevators, and includes a plastic base portion 15 upon which the other components are assembled. The base 15 is generally U-shaped and carries two pairs of stationary contacts 16 and 17 projecting upwardly from the bight. The contacts are formed on two pairs of terminsl posts 18 and 19 which project through the material of the base downwardly from the bight. Another pair of terminal posts 20 project downwardly from the base 15.
A central boss 21 is formed centrally on the upper surface of the bight of the base 15 and two flat projections 22, are formed in opposed legs 23 of the base 15. Flange portions 24 projecting laterally from the top of the legs each have a through hole 25.
A contact carrier 28 is formed as a generally rectangular plastic plate having recesses 29 on two opposet edges. Two pairs of contacts 30 and 31 are carried on the underside of the carrier 28 for mating, respect-ively, with the contacts 16 and 17. The contacts 30 are formed at opposite ends of a slightly rosilient conductive strip 32 mounted on the underside of the carrier, ant the contacts 31 are similarly formed on a strip 33.
~ne ond of a helical compression spring 34 is unted centrally to the undersido of the carrier 28 and the other end of the spring is received round tho boss 21 on the base 15.
Tho carrior 28 is arranged to move to and from the base, the projections 22 being received in the recesses 29 and acting as guides.
The spring 34 normally urges the carrier away from the base but the carrier can be moved against the action of the spring 34 so that the contacts 30 and 31 engage, respectively, the contacts 16 and 17 to bridge each pair of contacts 16 and 17.
The light module 14 rests on the upper surface of the contact carrier 28. Two leads 36 are connected to the tabs 10 of the module by means of screws 37 received through ring terminals 38 and the tapped holes 11. The other ends of the leads 36 are connected by means of ring terminals 39 to the respective terminal posts 20. In the alternative configuration of the tabs, spring loaded contacts connected to the posts 20 replace the leads 36, the contacts engaging the flat tab portions of the module.
A transparent plastic cup 40 having a rim 41 around its open end is received over the top of the module 14. The cap 40 carries on its downward facing surface a number designating a floor.
An inverted generally U-shaped housing member 42 has a rectangular hole 43 extending through the bight of the U. The legs 44 of the member 42 each have a through hole 45, the holes 45 registering respectively with the holes 25 on the base 15.
A trim member 47 has a rectangular channel portion 48 and a per-ipheral flange 49, the flange having two through holes 50. The trim member is dimensioned to rest on the member 44 with the flange 49 abutting the bight of the member 44 and a portion of the rectangular channel 48 projecting through the hole 43. The holes 50 register with the holes 45 and 25.
The cap 40 is received in the lower end of the rectangular channel 48, the rim 41 abutting the lower edges of the channel 48 to limit upward sliding movement of the cap 41 relative to the channel 48. Two long screws 51 are received through holes 50, 45, and 25 and cooperate with nuts (not) shown to maintain the components in assembled condition.
As can be seen in Figure 2, the coil spring 34 acts on the underside of the contact carrier 28 to urge the contact carrier 28, module 14 and cap 40 upwardly. The downwardly facing surfaces 53 of the legs 44 of housing member 42 overlap the legs 23 of base 15 to define stops limiting upward movement of the contact carrier 28. Upward movement of the module 14 and cup 40 is limited, as indicated above, by abutment of the rim 41 with the channel 48. In this position, the contacts 30 and 31 are remote from the contacts 16 and 17, respectively.
On depressing temporarily the top of the cap 40, the cap together with the module 14 and contact carrier 28 are depressed causing momentary bridging of the contacts 16 by contacts 30 and of the contacts 17 by contacts 31. The termdnal posts 18, 19 and 20 would be connected in a conventional manner to the elevator control circuitsy so that this momentary bridging of the contact pairs 16 and 17 would summon the elevator and cause 110 volts to be applied to terminals 20 to illuminate the module 14.
If one or two of the neon lamps were to burn out the module would still give sufficient light at least under some environmental conditions.
If it is necessary to replace the module this can easily be done simply by removing the screws 51 and 37.
It is to be noted that a standard size module can be used effect-ively with various conventional trims 47 having different sized channel portions 48 and caps 40 providing the cap is big enough to fit over the end of the module.
Instead of using the modules as push-button actuators as described above, they may convienently be used to illuminate numbers or other indicia on an indicator board, such as an elevator indicator board.
Although, the module 14 has been described, in the above embodi-ment, as being encapsulated, it is envisaged that the module would operate effectively without encapsulation in the simple role as a stationasy light sou~ce. Moreoves, the module could be used as a push-button without encap-sulating it; it could for example be contained in a stainless steel container having perforations to allow illumination.
It should be noted that the gsouping of the neon lamps provides a high level of illumination with practically no generation of heat.
This pesmits close tolerances and pesmits the light source to be located vesy close or in contact with the symbol to be illuminated, thus reducing the overall size of the device.
The encapsulated module, whether os not in a push button switch, can be used in particular environments whese open bulbs and contacts may be hazardous.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A compact light module for use with normal electrical utility supply voltage, the module comprising an assembly of a plurality of miniature neon lamps and resistors and two terminals, the lamps and resistors being connected to the terminals to provide a plurality of circuits connected permanently across the terminals, each circuit comprising a neon lamp and a resistor, the assembly being encapsulated in a rigid translucent plastics material through which the terminals project for connection to the supply voltage.
2. A light source as claimed in claim 1, in which the lamps, resistors and terminals are mounted on a printed circuit board.
3. A light source as claimed in claim 2, in which the lamps are mounted on one side of the printed circuit board and the resistors on the other.
4. A light source as claimed in claim 3, in which the one side of the printed circuit board is highly reflective.
5. An illuminated push button switch assembly comprising the module as claimed in claim 1, 2 or 3, at least one movable contact mounted for movement with the module, at least one stationary contact aligned for engage-ment with the movable contact, the module being movable by manual engagement between a first position in which the stationary and movable contacts are open and a second position in which the stationary and movable contacts are closed, and resilient means urging the module and movable contact to one of the two positions.
6. An illuminated push button switch assembly comprising the module as claimed in claim 4, at least one movable contact mounted for movement with the module, at least one stationary contact aligned for engagement with the movable contact, the module being movable by manual engagement between a first position in which the stationary and movable contacts are open and a second position in which the stationary and movable contacts are closed, and resilient means urging the module and movable contact to one of the two positions.
7. An illuminated push button switch assembly comprising the module as claimed in claim 1, 2 or 3, a movable contact carrier carrying at least one pair of electrically interconnected movable contacts, at least one pair of stationary contacts mounted on a housing portion, the module engaging the contact carrier, a translucent cap bearing an alpha-numeric notation mounted on the module, the cap being movable by manual engagement between a first position in which the stationary contacts are not bridged by the movable contacts and a second position in which the stationary contacts are bridged by the movable contacts, resilient means urging the contact carrier, module and cap to one of the two positions, the light module having flexible leads interconnecting the terminals of the module with terminals on the housing portion.
8. An illuminated push button switch assembly comprising the module as claimed in claim 4, a movable contact carrier carrying at least one pair of electrically interconnected movable contacts, at least one pair of stationary contacts mounted on a housing portion, the module engaging the contact carrier, a translucent cap being an alpha-numeric notation mounted on the module, the cap being movable by manual engagement between a first position in which the stationary contacts are not bridged by the movable contacts and a second position in which the stationary contacts are bridged by the movable contacts, resilient means urging the contact carrier, module and cap to one of the two positions, the light module having flexible leads interconnecting the terminals of the module with terminals on the housing portion.
9. An illuminated push button switch assembly comprising the module as claimed in claim 1, 2 or 3, a movable contact carrier carrying at least one pair of electrically interconnected movable contacts, at least one pair of stationary contacts mounted on a housing portion, the module engaging the contact carrier, a translucent cap bearing an alpha-numeric notation mounted on the module, the cap being movable by manual engagement between a first position in which the stationary contacts are not bridged by the movable contacts and a second position in which the stationary contacts are bridged by the movable contacts, resilient means urging the contact carrier, module and cap to one of the two positions, the terminals of the module having flat contacts engaging spring loaded contacts connected with terminals on the housing portion.
10. An illuminated push button switch assembly comprising the module as claimed in claim 4, a movable contact carrier carrying at least one pair of electrically interconnected movable contacts, at least one pair of stationary contacts mounted on a housing portion, the module engaging the contact carrier, a translucent cap bearing an alpha-numeric notation mounted on the module, the cap being movable by manual engagement between a first position in which the stationary contacts are not bridged by the movable contacts and a second position in which the stationary contacts are bridged by the movable contacts, resilient means urging the contact carrier, module and cap to one of the two positions, the terminals of the module having flat contacts engaging spring loaded contacts connected with terminals on the housing portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,528A CA1065392A (en) | 1976-11-01 | 1976-11-01 | Encapsulated neon lamp module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,528A CA1065392A (en) | 1976-11-01 | 1976-11-01 | Encapsulated neon lamp module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1065392A true CA1065392A (en) | 1979-10-30 |
Family
ID=4107159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA264,528A Expired CA1065392A (en) | 1976-11-01 | 1976-11-01 | Encapsulated neon lamp module |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1065392A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002649A1 (en) * | 1980-03-11 | 1981-09-17 | G Saer | Electronic lock,switching and hold devices for telephones |
| US4496813A (en) * | 1982-11-18 | 1985-01-29 | Sun Dengyosha Company, Limited | Illumination type push button switch |
-
1976
- 1976-11-01 CA CA264,528A patent/CA1065392A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002649A1 (en) * | 1980-03-11 | 1981-09-17 | G Saer | Electronic lock,switching and hold devices for telephones |
| US4496813A (en) * | 1982-11-18 | 1985-01-29 | Sun Dengyosha Company, Limited | Illumination type push button switch |
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