Low-tension lighting device

• US 6,218,785 B1
• Filed: 03/19/1999
• Issued: 04/17/2001
• Est. Priority Date: 03/19/1999
• Status: Expired due to Fees

• Current Assignee: Incerti & Simonini Di Incerti Edda & C. S.N.C.
• Original Assignee: Incerti & Simonini Di Incerti Edda & C. S.N.C.
• Inventors: Incerti, Edda
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VO, TUYET THI
• Application Number:
  US09/272,047
• Time in Patent Office: 760 Days
• Field of Search: 315/57, 315/185.S, 315/200.A, 315/291, 315/307, 315/306, 315/209, 315/32, 315/112, 315/118, 315/225, 313/634, 313/512, 313/312, 313/318.01, 362/307, 362/311
• US Class Current: 315/185.00S
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21W 2121/00 Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/3574 Emulating the electrical or functional characteristics of incandescent lamps
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The low-tension lighting device is provided with at least one LED (2) having a control circuit (3) which governs functioning thereof and which is connected to a coupling element, for example a screw-type coupling element (4), by means of which the device (1) is insertable in a lamp-holder of known type. The LED (2) is protected by a body (8) also functioning as a uniform diffusor of light emitted by the LED (2). The device (1) can be used to substitute low tension filament lamps for illumination in cemeteries.

Claims

1. A low-tension lighting device comprising:

a first base adapted for engagement to a lamp holder;

a shaped printed control circuit connected to said base;

an adapter ring engaged to said base;

parts of said printed control circuit respectively extending into said base and said adapter ring;

at least one LED engaged to and supported by said printed control circuit and extending in part into said adapter ring;

a translucent body having an internal chamber and a second open base engaged to and supported by said adapter ring;

said at least one LED extending in part into said internal chamber;

wherein an axis of said internal chamber is coaxial with an optical axis of the LED;

wherein the translucent body includes a concave transparent wall portion around the axis of said internal chamber;

wherein a portion of the translucent body adjacent to the transparent wall portion is convex toward the LED and whitened and

wherein a wall thickness of the translucent body along the axis of the internal chamber and above the convex and concave portions of the translucent body is greater than that of other wall portions of the translucent body.

2. A low-tension lighting device according to claim 1, wherein an external shape of the translucent body is flame shaped.

3. The device of claim 1, wherein the control circuit comprises;

a circuit stage functioning as an input protection;

a circuit stage functioning as a suppressor of voltage transient interferences;

a circuit stage functioning as a double half-wave rectifier;

a circuit stage functioning as a constant current regulator for preventing LED electrical and thermal overload;

a circuit stage functioning as a constant voltage stabilizer for supply to a flashing circuit;

a circuit stage functioning as an oscillator for flashing function; and

a circuit stage functioning as a circuit breaker for the LED.

4. A low-tension lighting device according to claim 1, wherein the transparent portion wall facing the LED is concave away from the LED.

5. A low-tension lighting device according to claim 4, wherein the transparent wall portion facing the LED is spherically shaped.

6. A low-tension lighting device comprising:

a first base adapted for engagement to a lamp holder;

a printed control circuit connected to said base;

a translucent body having an internal chamber and a second open base engaged to and supported by said first base;

at least one LED engaged to and supported by said printed control circuit and extending into said internal chamber;

wherein an axis of said internal chamber is coaxial with an optical axis of the LED;

and wherein the translucent body includes a concave transparent wall portion around the axis of said internal chamber and a convex wall portion adjacent to the transparent wall portion, a wall thickness of the translucent body along the axis of the internal chamber and above the convex and concave portions of the translucent body being greater than that of other wall portions of the translucent body.

7. A low-tension lighting device according to claim 6, further comprising an adapter ring engaged to said base;

parts of said printed control circuit respectively extending into said base and said adapter ring.

8. A low-tension lighting device according to claim 6, wherein an external shape of the translucent body is flame shaped.

9. The device of claim 6, wherein the control circuit comprises;

a circuit stage functioning as an input protection;

a circuit stage function as a suppressor of voltage transient interfaces;

a circuit stage functioning as a double half-wave rectifier;

a circuit stage functioning as a constant current regulator for preventing LED elect and thermal overload;

a circuit stage functioning as a constant voltage stabilizer for supply to a flashing circuit, a circuit stage functioning as an oscillator for flashing function; and

a circuit stage functioning as a circuit b for the LED.

10. A low-tension lighting device according to claim 6, wherein the transparent portion wall facing the LED is concave away from the LED.

11. A low-tension lighting device according to claim 10, wherein the transparent wall portion facing the LED is spherically shaped.

12. A low-tension lighting device according to claim 10, wherein the portion of the translucent body adjacent to the transparent wall portion is convex toward the LED and whitened.