CN100510523C

CN100510523C - Lamps

Info

Publication number: CN100510523C
Application number: CNB011049669A
Authority: CN
Inventors: 梁栋; 郑根全
Original assignee: BenQ Corp
Current assignee: Qisda Corp
Priority date: 2001-02-26
Filing date: 2001-02-26
Publication date: 2009-07-08
Anticipated expiration: 2021-02-26
Also published as: CN1370951A

Abstract

A lamp includes a lamp bulb with outer side wall and a heat dissipating guide hood with a heat dissipating air flow passage being formed in the gap between the outer side wall and the heat dissipating guide hood for the air flow to flow through. The heat dissipating guide hood has an outer edge to form a first ventilation plane together with the outer side wall, so that heat dissipating air flow is centralized to flow into the heat dissipating air flow passage for high heat dissipating efficiency. The present invention also discloses the outer kind of lamp including a lamp bulb, a heat insulating board outside the bulb and a heat dissipating board outside the heat insulating board with one isolating layer being formed between the two boards to reduce the surface temperature.

Description

Light fixture

Technical field

The present invention relates to a kind of light fixture, more particularly, relate to a kind of light fixture with high cooling efficiency.

Background technology

Present many equipment that utilize light fixture to come projection source, for example projector is just trending towards compact design, to adapt to and to meet the requirement of various occasions for convenience.Yet, when the light fixture reduced volume, employed red-hot bulb can make the skin temperature of light fixture raise greatly in the middle of the light fixture, make the equipment surface temperature surpass the higher limit of standards for safe use, may cause burn to human body, make product fail safety standards, and finally cause product to go on the market.

When the size of light fixture is big, because heat-dissipating space is big, do not have the too high problem of surface temperature, yet, when the size of light fixture continues to dwindle,, just become very important subject under discussion owing to heat-dissipating space is too small to cause the too high problem of its surface temperature.For example, general as the employed light fixture of the projection source of projector, its appearance and size, just around the size of the outer bulb envelope in the bulb outside, have the space up to 1 to 2 centimetre, under so big size, heat dissipation problem more easily overcomes, as long as rely on the design of general radiator fan and general air admission hole that the heat radiation air is provided, the mode that the type of flow of radiating airflow, use of heat sink or the like influence radiating efficiency does not need to consider optimization.But, for undersized light fixture, the size of outer bulb envelope may narrow down to several centimeter square significantly, at this moment not only decline to a great extent for the conduction surface that dispels the heat, and owing to the distance of outer bulb envelope and bulb furthers, more strengthened the width of cloth and penetrated fuel factor, the surface temperature of light fixture can raise significantly thus.

In the prior art, because projector typically uses large-sized light fixture, so the radiating mode of light fixture also only limits to the simple radiating mode.After for example being fixed on shell on the outer bulb envelope, provide radiating airflow to get final product with radiator fan, owing to adopt this mode just can reach enough radiating effects at an easy rate, therefore to the restriction and the water conservancy diversion of radiating airflow, do not need to spend too big time design, be exactly shell to be enclosed within on the outer bulb envelope to get final product simply purely, so radiating airflow almost is to flow between these two uncommittedly, most like this radiating airflow is the maximum radiating effect of performance not.

In addition, prior art also is to adopt fairly simple mode for photothermal obstruct, and reason is the same.Normally adopt heat-barrier material or heat reflection sheet to block thermal source.Yet, use the heat-barrier material expense higher, if improve heat-insulating efficiency, the cost that is increased becomes a square direct ratio haply with heat-insulating efficiency, does not calculate on the volume production.Moreover, because selected heat-barrier material also must possess suitable thickness, just can provide enough effect of heat insulation, and the small size light fixture often requires within the thickness of short 1mm, will reach enough radiant heat and block effect, this is that general heat insulation material is unapproachable.

Can't overcome the small size light fixture at above prior art and particularly block difficulty on the problems such as effect, be necessary to provide a solution in heat conduction, radiating airflow and heat radiation.The present invention is and addresses the above problem, and a light fixture with high cooling efficiency is provided.

Summary of the invention

Disclosed a kind of light fixture comprises a bulb, and described bulb has a lateral wall; And a heat radiation kuppe, be positioned at the outside of described bulb, and keep a distance with the lateral wall of described bulb, be formed with a radiating airflow passage that is used for limiting radiating airflow between heat radiation kuppe and the bulb lateral wall; Wherein, described heat radiation kuppe has an outer rim, is formed with one between the lateral wall of described outer rim and described bulb and supplies radiating airflow to flow into first ventilating surface of described radiating airflow passage.

By above-mentioned radiating airflow passage, can limit and utilize all radiating airflows to take away heat effectively, thereby raising radiating efficiency, and, by above-mentioned first ventilating surface, the outside of all radiating airflows be can effectively limit, mobile without restriction caused air-flow waste of radiating airflow and low heat emission efficient avoided by bulb.

The peripheral edge portion of above-mentioned heat radiation kuppe preferably also comprises a sunk area, is formed with one between the lateral wall of described sunk area and described bulb and supplies radiating airflow to flow into second ventilating surface of described radiating airflow passage.

By above-mentioned second ventilating surface, can work in coordination with first ventilating surface, except the influent stream amount that increases radiating airflow, can also increase the ability that radiating airflow is directly taken away the bulb heat.

Above-mentioned heat radiation kuppe preferably also comprises a constriction, is formed with the diminishing quick heat radiating gas channel of a sectional area between the lateral wall of described constriction and described bulb.

For avoiding shell overheated, the present invention has also disclosed a kind of light fixture, comprises that thermal insulation board and that a bulb, is positioned at the bulb outside is positioned at the heat sink in the thermal insulation board outside, forms one first separation layer between thermal insulation board and the heat sink.In addition, light fixture comprises that also one is positioned at the shell in the heat sink outside, is formed with one second separation layer between heat sink and the shell.

By the insulation layer structure that adopts above-mentioned heat sink and therefore produced, an air layer particularly, can utilize heat conducting principle that a large amount of heats is taken away by heat sink effectively, described separation layer also can seal becomes a vacuum layer, the characteristic that is difficult to heat conduction by the vacuum insulation layer, heat radiation is further blocked, thereby in limited space, the temperature of lamp outer casing is lowered significantly.

Under thermal insulation board and situation that outer bulb envelope partly contacts, thermal insulation board preferably also has a heat conduction blocking-up district that is positioned at the outside of thermal insulation board and bulb contact portion.

Thermal insulation board is the thermal insulation board with high-heating radiation reflectance factor and low thermal conductivity, for example an alloy heat sink or a corrosion resistant plate preferably.Heat sink is the heat sink with high thermal conductivity coefficient, for example a metallic plate, copper metallic plate or an aluminium metal sheet etc. preferably.

The design of heat radiation deflector, thermal insulation board and heat sink by disclosed light fixture can make light fixture in minimum space, heat radiation fast and effeciently, thus produce the light fixture that meets standards for safe use.

Description of drawings

Below in conjunction with accompanying drawing the present invention is explained in further detail.Wherein:

Figure 1 shows that the outside drawing of light fixture provided by the present invention;

Figure 2 shows that the structural representation of light fixture provided by the present invention;

Figure 3 shows that the decomposing schematic representation of light fixture provided by the present invention;

Fig. 4 briefly is depicted as the profile of the light fixture that has installed heat sink additional.

The specific embodiment

At first, please refer to Fig. 1, in first kind of light fixture provided by the present invention, light fixture 10 comprises a bulb 11, and bulb 11 has a lateral wall 12, also comprises an illuminating part (not shown) in the bulb, and lateral wall 12 inboards can be set to a reflecting surface (not shown); An and heat radiation kuppe 13 that is positioned at lateral wall 12 outsides.Radiating airflow is to be provided by bleeding by a radiator fan (not shown in Fig. 1, as to please refer to component symbol 15 shown in Figure 3) that is fixed in the radiator fan holder 14.

Below, please refer to Fig. 2, describe the structure of light fixture 10 in detail.Heat radiation kuppe 13 keeps a distance with bulb lateral wall 12, forms a radiating airflow passage 131 therebetween, thereby the restriction radiating airflow makes its radiating airflow passage 131 of flowing through.By this radiating airflow passage 131, can limit and utilize all radiating airflows to take away heat effectively, avoid radiating airflow to run helter-skelter and can't effectively take away the heat of bulb 11, thereby effectively carry radiating efficiency.

In addition, heat radiation kuppe 13 also has an outer rim 132, forms one first ventilating surface 133 between outer rim 132 and the bulb lateral wall 12, enters radiating airflow passage 131 for the radiating airflow circulation.By this first ventilating surface 133, can effectively limit radiating airflow, make can both the flow through outside of lateral wall 12 of main radiating airflow take away heat, thereby avoid because of radiating airflow flow without restriction caused air-flow waste and low heat emission efficient.

Be preferably, heat radiation kuppe 13 also comprises a sunk area 134 in outer rim 132 parts, forms one second ventilating surface 135 between sunk area 134 and the bulb lateral wall 12, enters radiating airflow passage 131 for the radiating airflow circulation.This second ventilating surface 135 can make radiating airflow blow to the lateral wall 12 of bulb 11 in fact forward, thereby takes away heat more.

Therefore,, not only can increase the influent stream amount of radiating airflow, can also increase the ability that radiating airflow is directly taken away the heat of bulb 11 by working in coordination of above-mentioned second ventilating surface 135 and first ventilating surface 133.

In addition, heat radiation kuppe 13 preferably also comprises a constriction 136, its sectional area dwindles gradually, thereby the distance between heat radiation kuppe 13 and the bulb lateral wall 12 is dwindled gradually, between bulb lateral wall 12 and constriction 136, form a radiating airflow passage 131 fast thus, wherein the flow velocity of radiating airflow can increase because of dwindling of actual internal area, whereby, under the requirement of the size of as far as possible dwindling light fixture 10, in limited space, take away heat fast, thereby improve radiating efficiency effectively.

Figure 3 shows that each element decomposing schematic representation of light fixture 10, cooperate above-mentioned explanation, can more clearly illustrate the relation between each element.

Below, please refer to Fig. 1 equally.In another kind of light fixture provided by the present invention, light fixture 10 comprises a bulb 11, a thermal insulation board (not shown among Fig. 1, as to please refer to component symbol 23 shown in Fig. 2 and 3) and a heat sink 24.

Below, please refer to Fig. 2 and 3, describe it in detail and form structure.

Thermal insulation board 23 is positioned at the outside of bulb 11, and thermal insulation board 23 has several holes 231, can be socketed in respectively on several support portions 137 of heat radiation kuppe 13, fixes thermal insulation board 23.Thermal insulation board 23 is a thermal insulation board with high-heating radiation reflectance factor and low thermal conductivity preferably, an alloy thermal insulation board or a corrosion resistant plate for example, the heat that comes from outer bulb envelope 12 so as to the reflection major part, thereby block heat, to prevent that heat from further outwards scattering, and by the radiating airflow that radiator fan produced the heat that this is blocked edge is taken away, thereby the surface temperature that prevents equipment is too high.

Usually, in order to dwindle the size of light fixture 10, outer bulb envelope 12 all has an outer cover contraction flow region 111, as shown in Figure 3, thus the height of reduction light fixture.Under these circumstances, thermal insulation board 23 contacts with each other with bulb 11, and contact portion is this outer cover contraction flow region 111.Under the situation that thermal insulation board 23 and bulb 11 contact with each other, thermal insulation board 23 preferably also has a heat conduction blocking-up that is positioned at the outer rim of outer cover contraction flow region 111 and distinguishes 232, limit the heat of thermal insulation board 23 with this, make heat concentrate on the upper section of outer cover contraction flow region 111, to reduce the temperature of thermal insulation board 23 other parts, reduce the effect that heat radiation is expanded outward whereby, thereby avoid the rising of the surface temperature of equipment.

Heat sink 24 is positioned at the outside of thermal insulation board 23, keeps a distance between heat sink 24 and the thermal insulation board 23, and this distance can be withstood heat sink 24 and obtains by protruding in the support portion 137 of thermal insulation board more than 23.Between thermal insulation board 23 and heat sink 24, form one first separation layer (please refer to symbol shown in Figure 4 17) whereby.

Heat sink 24 is a heat sink with high thermal conductivity coefficient preferably, and for example a metallic plate such as copper metallic plate or aluminium metal sheet etc. can promptly be conducted the high-temperature region of leaving outer bulb envelope 12 peripheries with heat with this.As shown in Figure 3, the area of heat sink 24 is greater than thermal insulation board 23, and extends backward, therefore can be with a large amount of heat bands from the high-temperature region, and large tracts of land increase heat sink 24 is distributed to heat the chance of ambient air whereby.

Generally speaking, light fixture 10 can comprise that also one is positioned at the shell (please refer to symbol shown in Figure 4 16) in heat sink 24 outsides, this shell 16 is in order to packaging lamp 10, the application apparatus that simultaneously also is general light fixture for example uses layer in the surface of projector, shell 16 is touched by the user usually easily, also is the measure portion that institute's requirement must be lower than a temperature limit in the product standard safe in utilization simultaneously.

Please refer to Fig. 4.Form one second separation layer 18 between heat sink 24 and the shell 16.Prior art does not disclose has one deck thermal insulation board and one deck heat sink between shell 16 and bulb 11, the present invention is by adopting thermal insulation board and the heat sink through particular design and collocation, just thermal insulation board 23 and heat sink 24, thereby particularly thermal insulation board 23 does not outwards disperse heat the heat limitation, and heat sink 24 can be further with heat by hot conduction band from, thereby reduce heat radiation effect to shell 16.In other words, by the many one decks separation layer that adopts thermal insulation board 23, heat sink 24 and therefore produced, can heat radiation be blocked and utilize heat conducting principle that a large amount of heats is taken away by thermal insulation board 23 by heat sink 24.Like this, can within limited space, temperature be lowered significantly.

First separation layer 17 and second separation layer 18 be air layer or vacuum layer preferably, does not need to use any insulating materials, just can reduce surface temperature effectively.In one embodiment of this invention, thermal insulation board 23 is metallic plates, and heat sink 24 is the thick aluminium alloy plates of a 0.2mm, and with thermal insulation board 23 and shell 16 each 0.5mm at interval.The measurement result of temperature is that thermal insulation board 23 about 100 ℃, heat sink 24 are reduced to about 60 ℃, and the temperature of shell 16 is reduced to about 45 ℃ especially, far below 60 ℃ of the higher limits of safety standard.

By the disclosed heat radiation deflector and the structural design of heat sink, can be in minimum space, effective quick heat radiating, thus obtain meeting the light fixture of safety standard.Use and comprise the equipment of above disclosed light fixture, projector for example is also within protection domain of the presently claimed invention.

Above preferred embodiment is to be used for more clearly describing feature of the present invention and spirit, but not is used for limiting protection scope of the present invention.And after those of ordinary skill in the art comprehended spirit of the present invention, can do a little change retouching and the variation that is equal to is replaced.Therefore protection scope of the present invention should be as the criterion with the desired protection domain of claims of the present invention

Claims

1. light fixture comprises:

One bulb, described bulb has a lateral wall;

One is used to provide the radiator fan of radiating airflow; And

One heat radiation kuppe is positioned at the outside of described bulb, and keeps a distance with the lateral wall of described bulb, is formed with a radiating airflow passage that is used for limiting radiating airflow between heat radiation kuppe and the bulb lateral wall; Wherein, described heat radiation kuppe has an outer rim, is formed with first ventilating surface that a confession radiating airflow flows into described radiating airflow passage between the lateral wall of described outer rim and described bulb,

Wherein, the peripheral edge portion of described heat radiation kuppe also comprises one from the outer rim of this heat radiation kuppe sunk area to this radiator fan direction depression, is formed with second ventilating surface that a confession radiating airflow flows into described radiating airflow passage between the lateral wall of described sunk area and described bulb.

2. light fixture according to claim 1, wherein, described heat radiation kuppe also comprises a constriction, is formed with a sectional area between the lateral wall of described constriction and described bulb along the diminishing quick heat radiating gas channel of the radiating airflow flow direction between the lateral wall of described constriction and described bulb.

3. projector, wherein, described projector has light fixture as claimed in claim 1.