CN101260987A

CN101260987A - Polarization type LED luminous tube

Info

Publication number: CN101260987A
Application number: CNA2008100360957A
Authority: CN
Inventors: 程德诗; 周士康; 王彪; 章琴华
Original assignee: Shanghai Sansi Technology Co Ltd
Current assignee: Shanghai Sansi Technology Co Ltd
Priority date: 2008-04-16
Filing date: 2008-04-16
Publication date: 2008-09-10

Abstract

The invention relates to a polarizing type LED luminotron, comprising a bracket, a reflecting cup, a chip and a packaging lens which packages the bracket and the reflective cup, wherein, the packaging lens comprises a column part and a convex part; a plane where the center line of the bracket is positioned or a plane which is parallel to the plane where the center line of the bracket is taken as a horizontal reference plane; an upper curved surface and a lower curved surface of the convex part of the packaging lens, taking the reference plane as a boundary, are unsymmetrical; a plane which is vertical to the horizontal reference plane and passes through an axial center line of the column part is taken as a vertical reference plane; a left curved surface and a right curved surface of the convex part, taking the vertical reference plane as a boundary, are symmetrical; in addition, the curvature of one point on the upper curved surface of the convex part taking the horizontal reference plane as the boundary is less than the curvature of a point which is positioned on the lower curved surface and corresponding to the point on the upper curved surface vertically. The invention adopts unsymmetrical design through changing the curvature of curved surfaces of a transmission body, so that an optical axis and a mechanical axis are separated in the vertical direction, visual angles of luminous rays are deviated in the vertical direction, a viewer can watch pictures facing to the optical axis direction, thereby achieving optimization of the brightness and the effect.

Description

Polarization type LED luminous tube

Technical field

The present invention relates to LED light emitting diode field, particularly a kind of polarization type LED luminous tube of inclined light shaft.

Background technology

Along with the progressively universal and application of LED light emitting diode in illumination and demonstration field, it day by day by people is approved also that in the advantage aspect energy-conservation, efficient and the environmental protection people also take the whole bag of tricks further to improve light efficiency and the performance of LED simultaneously.

Common LED light emitting diode construction comprises two metallic supports as the both positive and negative polarity pin, one of them support top is provided with a bowl-shape reflector, chip places the reflector bottom, and the lens that make with epoxy resin the outside of metallic support and reflector are sealed.Rays pass through lens refraction and reflective cup reflects that chip sends are come out.Lens are modal cylinder or the oval cylinder that is bullet shaped, and the top is round end or ellipsoid head, and its light distribution axisymmetricly or the plane symmetry shape; Its optical axis and mechanical axis also all coincide together.We know, along on the optical axis direction, the light that chip sends is the brightness maximum, and visual effect is also best.

The applicant was ZL200720068630.8 in the patent No. once also, name is called in the utility model patent of " a kind of encapsulating structure of novel perforations plug-in type light emitting diode ", disclose the light that originally comparatively to disperse on the display screen vertical direction and adjusted polymerization, improved with the brightness of pursuing optical axis direction.But the position of optical axis does not change in vertical direction, promptly overlaps with mechanical axis yet.

Under a lot of situations, the LED display installation site is all than higher, thereby optical axis direction is always departed from beholder's visual angle yet in actual use.So just cause the significant wastage of light source, also influenced viewing effect.

For solving above problem, common way has two kinds: a kind of the LED giant-screen is made inclination.This just requires the intensity of screen mount enough big, so there is very big potential safety hazard in the dangerous property of this way; Another kind is made inclination with the LED display module, and the display screen of dressing up with these module spliced is from seeing indentation in appearance, and is very not attractive in appearance, and complex structure, and the process and assemble difficulty is also very big.So,, also all have very big drawback though two kinds of methods all can be implemented in optical axis deviation on the vertical direction and point to the beholder position.

A kind of like this way is also arranged, and the shape by changing the LED light-emitting diode reflective cup is in the hope of solving the problem of above-mentioned existence, and its way is: reflector is made asymmetric in vertical direction shape.Because support and radiation cup profile are all very little, this design not only die cost is high, and its required precision is too high, control gets up to have great difficulty, so in use find, its intensity distribution curve is unsmooth, inhomogeneous, the light source wasting phenomenon, and therefore, this way is afterwards also by having eliminated slowly.

Summary of the invention

For effectively addressing the above problem, the objective of the invention is to design a kind of polarization type LED luminous tube, change by package lens structure the LED light emitting diode, make that optical axis direction has a down dip on the vertical direction.

For achieving the above object, concrete technical scheme of the present invention is as follows:

Polarization type LED luminous tube comprises support, reflector and chip and the package lens that support and reflector are sealed; This package lens comprises trunk portion and convex shaped part; Wherein, be horizontal reference plane with plane, carriage center line place or to be parallel to plane, carriage center line place, this package lens convex shaped part is that two curved surfaces up and down on boundary are asymmetric with this horizontal reference plane; Being the vertical reference face perpendicular to horizontal reference plane and the plane by the trunk portion longitudinal center line, convex shaped part with this vertical reference face be the boundary about two curved surfaces be symmetry; And, convex shaped part with described horizontal reference plane be on the upper curved surface on boundary certain any curvature less than on the lower curved face with the curvature of the vertical corresponding point of this point.

Further, described trunk portion is that two curved surfaces up and down on boundary can be symmetry with described horizontal reference plane, also can be asymmetric.

Again, the optical axis of luminous tube of the present invention becomes an inclination angle with horizontal reference plane; This inclination angle is 3 °～30 °.

LED light emitting diode when work,, make that optical axis direction has a down dip on the vertical direction because the design of two curved surfaces of package lens convex shaped part changes.

Beneficial effect of the present invention

The present invention is by changing the curvature of two curved surfaces of LED package lens convex shaped part, be designed to respect to asymmetric shape about the horizontal reference plane, make that optical axis separates with mechanical axis on the vertical direction, depart from vertical direction at the visual angle of realization light, allow the beholder watch picture, reach the best of brightness and effect facing to the direction of optical axis.Reaching under the situation of same brightness, the power supply of LED luminous tube can reduce, thereby the power that entire display screen need be used also can reduce, and has reduced production cost, realizes energy-saving effect.Because the size of lens is next much bigger with respect to reflector, thereby compare with the way of change reflector shape, control can be more accurate, and cost is much smaller.

Description of drawings

Fig. 1 is the stereogram of polarization type LED luminous tube one embodiment of the present invention;

Fig. 2 is the three-dimensional exploded view of polarization type LED luminous tube embodiment of the present invention;

Fig. 3 is the stereogram of polarization type LED luminous tube package lens of the present invention;

Fig. 4 is that the A of Fig. 3 is to view;

Fig. 5 is the vertical view of Fig. 4;

Fig. 6 is the curve of light distribution figure of the embodiment of the invention.

The specific embodiment

Referring to Fig. 1～Fig. 5, one embodiment of polarization type LED luminous tube of the present invention, this LED luminous tube comprises two

supports

2,3 that couple together by lead-in wire, place the reflector 4 of

support

2,3 front ends and place the chip 5 of reflector 4 bottoms, and the package lens 1 that support 2,3 and reflector 4 are sealed;

This package lens 1 comprises trunk portion 11 and convex shaped part 12, is horizontal reference plane 100 with the plane, place of

support

2,3 center lines, and this package lens 1 convex shaped part 12 is that two curved surfaces 121,122 up and down on boundary are asymmetric with this horizontal reference plane 100; With vertical direction plane, trunk portion 11 longitudinal center line place is vertical reference face 101, convex shaped part 12 with this vertical reference face 101 be the boundary about two curved surfaces 123,124 be symmetry; And, convex shaped part 12 with the curvature of certain 1 a on described horizontal reference plane 100 upper curved surface 121 that is the boundary less than on the lower curved face 122 with the curvature of the vertical corresponding some b of this point.

In the present embodiment,

support

2,3 is positioned on the horizontal plane at package lens 1 trunk portion 11 longitudinal center line places.Certainly, can also be horizontal reference plane to be parallel to plane, support 2,3 center line place.

Referring to Fig. 4,100 one-tenth one inclined angle alpha of the optical axis 103 and the horizontal reference plane of luminous tube of the present invention; This inclined angle alpha is 3～30 °, can select the arbitrary value in 5 °, 10 °, 15 °, 25 ° or the like the aforementioned range as required.

In addition, described trunk portion 11 is that two curved surfaces 111,112 up and down on boundary can be asymmetrical design with horizontal reference plane 100.

During LED work, because the variation of upper curved surface 121 curvature of package lens 1 convex shaped part 12, make LED optical axis 103 downward-sloping, be light downward bias from, can make the beholder's who is positioned at LED luminous tube below visual angle face the luminous tube optical axis direction like this, compare light with existing LED luminous tube more in beholder's direction set, luminosity obviously increases than before.

Referring to Fig. 6, it is the curve of light distribution figure of the embodiment of the invention.Curve L1 is the distribution of light of horizontal direction, and the LED luminous tube of itself and conventional shape is as broad as long.Curve L2 is the distribution of light on the vertical direction, and its optical axis has occurred departing from respect to mechanical axis, and finds out from curve, and on the optical axis direction after depart from the edge, luminosity obviously increases.So not only realize making beholder's visual angle to face optical axis direction and watched, avoiding the waste of light source, and can improve brightness; Perhaps reaching under the situation of equal brightness, reducing the used power of display screen, realizing energy-conservation effect.

Claims

1. polarization type LED luminous tube comprises support, reflector, chip and the package lens that support and reflector are sealed; This package lens comprises trunk portion and convex shaped part; It is characterized in that: with plane, carriage center line place or to be parallel to plane, carriage center line place is horizontal reference plane, and this package lens convex shaped part is that two curved surfaces up and down on boundary are asymmetric with this horizontal reference plane; Being the vertical reference face perpendicular to described horizontal reference plane and the plane by the trunk portion longitudinal center line, convex shaped part with this vertical reference face be the boundary about two curved surfaces be symmetry; And, convex shaped part with described horizontal reference plane be on the upper curved surface on boundary certain any curvature less than on the lower curved face with the curvature of the vertical corresponding point of this point.

2. polarization type LED luminous tube as claimed in claim 1 is characterized in that, described trunk portion is that two curved surfaces up and down on boundary can be symmetry with described horizontal reference plane, also can be asymmetric.

3. polarization type LED luminous tube as claimed in claim 1 is characterized in that, the optical axis of this luminous tube becomes an inclination angle with horizontal reference plane.

4. polarization type LED luminous tube as claimed in claim 3 is characterized in that, described inclination angle is 3 °～30 °.