Illumination system and illumination unit

• US 20020114155A1
• Filed: 11/21/2001
• Published: 08/22/2002
• Est. Priority Date: 11/24/2000
• Status: Active Grant

• Current Assignee: Moriyama Sangyo Kabushiki Kaisha
• Original Assignee: Moriyama Sangyo Kabushiki Kaisha
• Inventors: Iso, Naohisa, Katogi, Masayuki
• Granted Patent: US 6,659,622 B2
• Time in Patent Office: Days
• US Class Current: 362/219
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21S 8/033 the surface being a wall or like vertical structure, e.g. building facade
• CPC Class Codes: F21V 14/08 by movement of the screens or filters
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 21/005 for several lighting devices in an end-to-end arrangement, i.e. light tracks
• CPC Class Codes: F21V 21/088 Clips; Clamps
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines

Abstract

An illumination system of the invention comprises: a first illumination unit comprising a pair of power supply contacts for connection to a commercial AC power source, a light source connected between the pair of power supply contacts, a control circuit connected in series to the light source to control electric current flowing through the light source, and a connection cord connected to the light source; and a second illumination unit comprising a light source and a connection cord connected to the light source, wherein the connection cord of the first illumination unit and the connection cord of the second illumination unit are connected to each other so that the light source of the first illumination unit and the light source of the second illumination unit are connected in parallel to each other.

Claims

1. An illumination system, comprising:

a first illumination unit comprising a pair of power supply contacts for connection to a commercial AC power source, a light source connected between the pair of power supply contacts, a control circuit connected in series to the light source to control electric current flowing through the light source, and a first connection cord connected to the light source; and

a second illumination unit comprising a light source and a first connection cord connected to the light source,

wherein the first connection cord of the first illumination unit and the first connection cord of the second illumination unit are connected to each other so that the light source of the first illumination unit and the light source of the second illumination unit are connected in parallel to each other.

2. An illumination system according to claim 1, wherein the first illumination unit further comprises a second connection cord connected to the light source commonly with the first connection cord;

the system further comprises a third illumination unit comprising a light source and a first connection cord connected to the light source; and

the second connection cord of the first illumination unit is connected to the first connection cord of the third illumination unit so that the light source of the first illumination unit and the light source of the third illumination unit are connected in parallel to each other.

3. An illumination system according to claim 1, wherein the second illumination unit further comprises a second connection cord connected to the light source commonly with the first connection cord.

4. An illumination system according to claim 1, wherein each of the illumination units comprises a longitudinal support member for supporting the light source, and each connection cord is provided in a vicinity of an associated longitudinal end of the support member of each illumination unit.

5. An illumination system, comprising:

first and second illumination units, each having a light source and first and second connection cords commonly connected to the light source; and

a control unit separate from the first and second illumination units, the control unit having a pair of power supply contacts and a control circuit,

wherein the first illumination unit is connected to the control unit via its first connection cord so that the light source of the first illumination unit is connected between the pair of power supply contacts of the control unit via the control circuit of the control unit;

wherein the second connection cord of the first illumination unit is connected to the first connection cord of the second illumination unit so that the light source of the first illumination unit and the light source of the second illumination unit are connected in parallel to each other; and

wherein each of the first and second illumination unit has a longitudinal support member for supporting the light source and each connection cord is provided in a vicinity of an associated end of the support member of each illumination unit.

6. An illumination system according to claim 5, wherein each of the first and second illumination units further comprises a light-transmissive tubular member for accommodating the support member and the light source, and a cap member having a bottom wall and a cylindrical side wall and attached to an end of the tubular member, with the bottom wall being formed with a groove or slit for receiving an associated end of the support member.

7. An illumination system according to claim 6, wherein the side wall of the cap member is formed with a hole through which an associated connection cord is passed.

8. An illumination system according to claim 6, wherein the light source of each of the first and second illumination units comprises a plurality of light emitting elements, and the longitudinal support member consists of a printed circuit board on which the plurality of light emitting elements are mounted.

9. An illumination system according to claim 5, wherein:

the light source of each of the first and second illumination units comprises a red light source, a green light source and a blue light source;

the control circuit comprises first, second and third control elements connected in series to the red light source, green light source and blue light source, respectively, of the first illumination unit; and

the second connection cord of the first illumination unit and the first connection cord of the second illumination unit are connected to each other so that light sources of a same color in these illumination units are connected in parallel to each other.

10. An illumination system according to claim 5, wherein:

the light source of each of the first and second illumination units comprises a red light source, a green light source and a blue light source;

the control circuit comprises first, second and third control elements connected in series to the red light source, green light source and blue light source, respectively, of the first illumination unit; and

the second connection cord of the first illumination unit and the first connection cord of the second illumination unit are provided with respective connectors, the connectors being adapted so that light sources of different colors in the first and second illumination units can be connected in parallel to each other via the connectors.

11. An illumination system according to claim 9, wherein the red light source comprises a red LED set having a series-connected plurality of red LEDs, the green light source comprises a green LED set having a series-connected plurality of green LEDs, and the blue light source comprises a blue LED set having a series-connected plurality of blue LEDs, and wherein each of the first, second and third control elements consists of a switching element.

12. An illumination system according to claim 10, wherein the red light source comprises a red LED set having a series-connected plurality of red LEDs, the green light source comprises a green LED set having a series-connected plurality of green LEDs, and the blue light source comprises a blue LED set having a series-connected plurality of blue LEDs, and wherein each of the first, second and third control elements consists of a switching element.

15. An illumination unit according to claim 14, wherein the light source comprises a red light source, a green light source and a blue light source, and each of the connection cord is provided with a connector which has a first pin connected to a common line, a second pin connected to the red light source, a third pin connected to the green light source and a fourth pin connected to the blue light source.

16. An illumination unit according to claim 15, further comprising a longitudinal support member for supporting the light source, wherein at least one of the connection cords is provided in a vicinity of one end of the support member and at least one of the other connection cords is provided in a vicinity of the other end of the support member.

13. An illumination unit, comprising:

a pair of power supply contacts for connection to a commercial AC power source;

a light source comprising a plurality of LEDs mounted on one side of a longitudinal printed circuit board, the light source being connected between the pair of power supply contacts;

a control circuit attached on the other side of the printed circuit board and connected in series to the light source;

a transformer-less AC/DC converter attached on the other side of the printed circuit board and connected to the power supply contacts in order to supply a DC voltage to the control circuit; and

a light transmissive tubular member for accommodating the light source, printed circuit board, control circuit and transformer-less AC/DC converter.

14. An illumination unit, comprising:

a light source, and

at least three connection cords commonly connected to the light source so as to enable the illumination unit to make a bifurcation connection with other illumination units.