LED retrolift lamp for exit signs
First Claim
Patent Images
1. An LED retrofit lamp for exit signs, comprising:
- a cylindrical glass envelope associated with a screw base, the base adapted for insertion in a standard bulb socket;
an illumination means having circuitry for connection with an A/C source through a nondissipative voltage dropping element, the illumination means comprising a plurality of LEDs arranged in two serial LED strings, comprising first and second LED strings, each string connected in parallel with the other, enclosed in the glass envelope;
a rotatable assembly for rotating the illumination means against a frictional contact with the envelope, within a rotating range of less than 160 degrees with reference to the base; and
,a means for anchoring the illumination means in a desired optimal view, rotative position with reference to the base.
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Abstract
A retrofit lamp having light emissive diodes, and more particularly, to a retrofittable lamp configured as a standard incandescent lamp which can be used effectively in illuminated signs, such as an exit sign, for operation on each cycle of A/C voltage applied. The newly designed solid-state lamp features a base that can be rotated, approximately 160 degrees, to allow for the optimal positioning of the LED array to maximize the light intensity directed toward the illuminated area.
465 Citations
27 Claims
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1. An LED retrofit lamp for exit signs, comprising:
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a cylindrical glass envelope associated with a screw base, the base adapted for insertion in a standard bulb socket; an illumination means having circuitry for connection with an A/C source through a nondissipative voltage dropping element, the illumination means comprising a plurality of LEDs arranged in two serial LED strings, comprising first and second LED strings, each string connected in parallel with the other, enclosed in the glass envelope; a rotatable assembly for rotating the illumination means against a frictional contact with the envelope, within a rotating range of less than 160 degrees with reference to the base; and
,a means for anchoring the illumination means in a desired optimal view, rotative position with reference to the base. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An improved solid-state lamp, comprising:
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a glass envelope associated with a screw base, the base adapted for insertion in a standard bulb socket; an illumination means having circuitry for connection with an A/C source, the illumination means enclosed in the glass envelope; a rotatable assembly for rotating the illumination means with reference to the base; a means for anchoring the illumination means in a desired optimal view, rotative position with reference to the base; wherein the illumination means further comprises a dual sided printed circuit board assembly having an upper surface and a lower surface and a plurality of serially connected LEDs mounted on both the upper and lower surfaces of the circuit board; wherein the plurality of LEDs comprises first and second serial arrays of LEDs connected in parallel, each array connected in series with a half wave rectifier, such that the first array conducts in the opposite direction of the second array; further comprising a means for limiting current connected in series to the LED arrays which are connected in parallel; wherein the means for limiting current comprises a capacitor; wherein the means for limiting current further comprises a varistor positioned in parallel with the LED arrays; wherein the rotatable assembly for rotating the illumination means comprises the glass envelope fixed to a molded base, a plastic insert secured to the screw base by fasteners, and a frictional retainer positioned intermediate the insert and the glass envelope for frictional contact with, and retention of, the glass envelope and enclosed illumination means in a desired rotative position. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An improved solid state-lamp, comprising:
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an illuminating means communicating with an A/C power source; the illuminating means comprising a first string of serial LEDs connected in series with a half wave rectifier to the A/C source for conducting current in a first direction;
a second string of serial LEDs connected in series with a half wave rectifier to the A/C source for conducting current in a second direction opposite to the first current direction of the first string;
the first string and second string connected in parallel;
a nondissipative voltage dropping element positioned between the A/C source and the first and second LED strings; and
, both strings of serial LEDs connected across the power source, whereby a positive half cycle of A/C voltage provides conduction with consequent illumination of the first string and a nonconductive state in the second string; and
, an alternate negative half cycle of A/C voltage provides conduction with consequent illumination of the second string and a nonconductive state in the first string, for constant illumination of the lamp. - View Dependent Claims (19, 20)
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- 24. Improvements for an LED lamp for use in exit signs as a retrofittable replacement lamp in a standard incandescent bulb socket and powered by standard A/C voltage mounted in a glass envelope, said improvements embodied by said lamp comprising two strings of serially connected LEDs, that are oppositely directed and mounted on opposite sides of a dual sided printed circuit board, the strings connected in parallel and each string in series with a half-wave rectifier forward of a parallel voltage suppressing means that is also forward of a series connected, nondissipative current limiting means, having a screw base connected with a rotatable insert, and a plastic base adhered to the envelope and in frictional contact with a retainer positioned between the envelope and said insert, said lamp adapted for rotation to an optimum position to produce a maximum constant illumination area.
Specification