KR20160025857A - Design method of lamp for vehicle and lamp for vehicle - Google Patents

Abstract

The present invention relates to a method for designing an automobile lamp including a light source; a lens arranged in front of a light source; and a bezel part including a thermal radiation surface while connecting the light source with the lens. The method of the present invention comprises: a) a step for performing a regression analysis, with the surface temperature change of the lens as a dependent variable, and spacing distance between the lens and thermal radiation surface as an independent variable; b) a step for detecting a standard spacing distance which corresponds to a defrosting temperature change among the surface temperature changes through the regression analysis; c) and a step for deriving the correlation between the standard spacing distance and the output of the light source. While reducing the spatial limit of the lamp design, the defrosting effect of the lens can be maximized.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of designing a vehicle lamp,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of designing a vehicle lamp and a vehicle lamp, and more particularly, to a vehicle lamp having a cooling structure for radiating heat generated from a light source through a conductive material .

BACKGROUND OF THE INVENTION [0002] Vehicle lamps are broadly divided into headlamps installed at the front of the vehicle and taillamps installed at the rear of the vehicle. Generally, a headlamp is mounted on both sides of a front side of a vehicle to secure a view direction of the driver in the nighttime driving.

Recently, a light emitting diode (LED) (hereinafter referred to as an LED) can be used as a light source of such a vehicle lamp. In general, automotive lamps using LEDs have a color temperature of about 5500K, which is close to sunlight, which has the advantage of minimizing fatigue in human eyes. In addition, since the size of the vehicle lamp is small, the design freedom of the lamp is high and the life span of the lamp is economical.

These LEDs are typically fabricated in module form. The LED module is assembled with an LED heat sink module to properly cool the heat emitted from the LED. Generally, the LED heat dissipation module has a flat plate shape and a plurality of cooling fins protruding from one side. And cooling by the convection is performed while the cooling fin is cooled by the air introduced through the fan disposed behind the lamp.

However, such a cooling structure of a vehicle lamp has a problem that space limitation is great in designing a design of a lamp because a fan and a convection space must be provided behind the lamp.

In addition, in order to melt the ice of the lamp or the snow or frost accumulated in the lamp, a separate device such as a heater and a fan must be additionally provided in the lamp. In addition, have.

Accordingly, it is an object of the present invention to provide a lamp for a vehicle which can eliminate the spatial restriction of the lamp design while securing the heat radiation efficiency.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a vehicular lamp design method including a light source, a lens disposed in front of the light source, and a bezel portion including a thermally conductive material and connecting the light source and the lens, A regression analysis is performed using a) a change in the surface temperature of the lens as a dependent variable and a separation distance between the lens and the thermal radiation surface as independent variables; b) And c) deriving a correlation between the reference distance detected for each light source and the output of the light source. The present invention also provides a method of designing a lamp for a vehicle.

Preferably, the surface temperature change means a difference between a surface temperature of the lens when the light source is turned off and a surface temperature of the lens when the light source is turned on.

Preferably, the change in the ice making temperature means a difference between a surface temperature of the lens in a state in which the light source is turned off and a surface temperature of the lens in which the ice making is performed in a state in which the light source is turned on.

Preferably, the spacing distance is a distance between the lens and the thermal radiation surface with respect to the optical axis direction.

Preferably, the light source is a light emitting diode.

According to another aspect of the present invention, there is provided an image forming apparatus including a light source, a lens disposed in front of the light source, and a bezel portion connecting the light source and the lens, the bezel portion being made of a thermally conductive material and including a thermal- And the reference distance is detected through a regression analysis in which a change in the surface temperature of the lens is a dependent variable and a separation distance between the lens and the thermal barrier is an independent variable, Wherein the temperature of the ice making chamber corresponds to the change of the ice making temperature at which ice making is performed during the change.

Preferably, the vehicle lamp is characterized in that a change in surface temperature means a difference between a surface temperature of the lens in a state in which the light source is turned off and a surface temperature of the lens in a turned-on state of the light source .

Preferably, the vehicular lamp may have a change in the ice making temperature, the difference between a surface temperature of the lens in a state in which the light source is turned off and a surface temperature of the lens in which the ice making is performed in a state in which the light source is turned on.

Preferably, the vehicle lamp may be a distance between the lens and the thermal radiation surface with respect to an optical axis direction.

Preferably, the vehicular lamp is characterized in that the light source is a light emitting diode.

According to an embodiment of the present invention, heat generated from a light source is emitted through a heat-radiation surface of a bezel portion made of a thermally conductive material, By providing the lens and the thermal protection surface at the optimum positions, it is possible to maximize the effect of the ice making of the lens while eliminating the space limitation of the lamp design design.

According to an embodiment of the present invention, a reference distance is detected through a regression analysis, a correlation between the detected reference distance and the output of the light source is derived, and a general formula for lamp design is modeled. Thereby providing an advantageous effect of facilitating the operation.

1 and 2 show a lamp for a vehicle according to a preferred embodiment of the present invention,
3 is a view illustrating a method of designing a lamp for a vehicle according to a preferred embodiment of the present invention.
Fig. 4 is a graph showing a result of a regression analysis of the distance and the surface temperature change in a light source having an output of 3W,
5 is a graph showing a result of a regression analysis of the distance and surface temperature change in a light source having an output of 5W.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms and the inventor should properly define the concept of the term in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

When the LED is used as a light source of a lamp for a vehicle, it is necessary to provide a means for emitting heat generated from the LED. This is because the LEDs are parts that generate a lot of heat, and the lifetime of the LEDs may be lowered due to high heat emission. A structure including a fan for blowing air with a radiating fin added to the LED substrate as a heat dissipating means is provided at the rear of the lamp. However, such a heat dissipating means has caused many spatial restrictions in designing the design of the lamp to enhance the aesthetics, resulting in an increase in weight and manufacturing cost. In order to solve such a spatial limitation, increase in weight, and increase in manufacturing cost, the vehicle lamp according to the preferred embodiment of the present invention removes the existing radiating fins and the fan, and dissipates the heat generated from the LED to the outside of the vehicle In this case, the device is designed to dissolve the snow or frost accumulated in the lens disposed on the outer side of the lamp by using the heat radiated from the outside.

1 and 2 are views showing a lamp for a vehicle according to a preferred embodiment of the present invention. It will be apparent to those skilled in the art from this disclosure that Fig. 1 clearly shows only the main feature parts in order to clearly illustrate the invention, and as a result various variations of the illustration are to be expected and the scope of the invention There is no.

The vehicle lamp shown in Fig. 1 exemplifies a head lamp installed in front of the vehicle, and the vehicle lamp shown in Fig. 2 exemplifies a tail lamp installed in the rear of the vehicle.

1 and 2, a vehicle lamp according to an exemplary embodiment may include a light source 110, a lens 120, and a bezel 120 formed of a thermally conductive material. 1 and 2 clearly illustrate only the major feature parts for the purpose of a clear understanding of the present invention and as a result various variations of the illustrations are to be expected and the scope of the invention Need not be limited.

The light source 110 may be a light emitting diode (LED). The light source 110 may have a single light source, or a plurality of light sources 110 may be arranged in a horizontal direction or a vertical direction. When a plurality of light sources 110 are disposed, light emitted from each light source 110 may be combined to realize a predetermined light distribution pattern.

The lens 120 may be disposed in front of the light source 110.

In the case of the head lamp, the bezel 120 may be formed to have a socket having a reflector formed inside thereof corresponding to the position of the light source 110. In the case of a tail lamp, it may be arranged in a frame shape corresponding to the position of the light source 110.

The bezel 120 may be made of a thermally conductive material and may include a certain heat radiation surface 131. The thermal radiation surface 131 is disposed to face the lens 120 and radiates heat transferred from the light source 110 to the atmosphere through thermal radiation. The heat generated by the light source 110 is transmitted to the thermal barrier 131 through the heat dissipation path formed in the bezel 130 and may be discharged to the atmosphere in the form of thermal radiation from the thermal barrier 131.

As a result, there is no need to provide a facility for heat dissipation such as a separate fan or a convection space behind the lamp, thus eliminating the space limitation in designing the design of the lamp.

On the other hand, the heat radiated through the thermal radiation surface 131 passes through the lens 120 and is emitted to the outside. In a vehicle lamp according to an embodiment, radiant heat transmitted through the lens 120 is transmitted to the lamp 120, (Hereinafter, referred to as " ice-making operation ").

For the ice-making operation, the reference temperature value of the surface temperature change of the lens 120 should be abnormal. The surface temperature change of the lens 120 refers to a change in the surface temperature of the lens 120 in a state in which the light source 110 is turned off and a change in the surface temperature of the lens 120 in a state in which the light source 110 is turned on in a state in which the light source 110 is turned on 120). ≪ / RTI >

The surface temperature change of the lens 120 (hereinafter referred to as the ice making temperature change) capable of melting the lens 120 or melting the snow or frost accumulated in the lens may be approximately 10 °.

At this time, an element that can affect the surface temperature of the lens 120 is the distance between the output of the light source 110 and the lens 120. In designing the lamp for a vehicle, when the output of the light source 110 is low Or the distance to the lens 120 is long, there is a problem that it is difficult to realize the change of the ice making temperature.

The optimum value of the lens 120 and the thermal barrier surface 131 corresponding to the output of the light source 110 that can realize the change of the ice making temperature by using the radiation heat emitted through the thermal barrier surface 131 of the bezel 130 Describe how to design the positional relationship.

3 is a view illustrating a method of designing a lamp for a vehicle according to a preferred embodiment of the present invention.

As shown in Fig. 3, first, the surface temperature change of the lens 120 is used as a dependent variable, and the distance between the lens 120 and the thermal barrier surface 131 (hereinafter referred to as a separation distance) The distance D may be a distance between the lens 120 and the thermal radiation surface 131 with reference to the direction of the optical axis.

FIG. 4 is a graph showing a result of a regression analysis of a distance between a light source and a surface temperature change in a light source having an output of 3 W. FIG. 5 is a graph showing a result of a regression analysis of a separation distance and a surface temperature change to be.

Referring to FIGS. 4 and 5, when the output of the light source 110 is 3 W and 5 W, the surface temperature change? T of the lens 120 according to the separation distance D is regression analyzed, (Hereinafter referred to as a reference separation distance D1) for realizing the ice making temperature change A for each light source 110 (S200)

For example, referring to FIG. 5, when the output of the light source 110 is 5W, the separation distance at 10 ° which is the ice making temperature change (A) corresponds to 30 mm, and this distance corresponds to the reference separation distance D1 . Therefore, in the case of the 5W light source 110, if the spacing distance D is designed to be 30 mm, the effect of the ice making can be maximized. Since the ice making temperature change (A) is realized by using the radiant heat emitted through the bezel part (130) made of the thermally conductive material, the space for the lamp design can be secured by removing the accessory device for the ice making operation, .

Next, the correlation between the reference separation distance D1 detected for each light source 110 and the output of the light source 110 is derived (S300)

Specifically, as shown in Table 1 below, reference separation distances D1 are obtained for each light source having different outputs (for example, 5W, 4W, 3W, and 2W).

The output (W) Reference separation distance (D1) Deicing temperature change (ΔT) 5 50.382 10 ° 4 39.682 10 ° 3 28.532 10 ° 2 17.382 10 °

Then, a correlation between the output of the light source 110 and the reference separation distance D1 is derived. Based on the derived correlation, the following equation (1) can be derived through modeling.

&Quot; (1) "

D1 = -A + BW

Here, D1 denotes a reference separation distance, and W denotes an output of the light source.

A and B are constant values satisfying the correlation based on the data on the output of the light source 110 and the reference distance D1 measured in the condition of the lamp applied to various vehicles, And B may be any constant value between 11.0 and 12.0.

For example, when A is 4.918 and B is 11.15 and the output of the light source W of the vehicle is 3.26W, the reference separation distance D1 is calculated by the following equation (1) -4.198 + 11.15 * 3.26 = 31.4), it is confirmed that the ice making performance can be ensured when the lens 120 of the vehicle and the heat radiation surface 131 are designed to be separated by 31.4 m.

Since the reference distance D1 between the lens 120 of the vehicle and the thermal radiation surface 131 can be easily calculated through the equation (1), the radiation heat emitted from the thermal radiation surface 131 can be used There is an advantage that the lamp design for securing the ice-making performance of the lens 120 can be facilitated.

As described above, a method of designing a vehicle lamp and a vehicle lamp according to a preferred embodiment of the present invention have been described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

110: Light source
120: lens
130: Bezel portion
131: Thermal radiation face

Claims (10)

1. A method for designing a lamp for a vehicle, comprising: a light source; a lens disposed in front of the light source; and a bezel portion comprising a thermally conductive material and connecting the light source and the lens,
a) performing a regression analysis using a change in surface temperature of the lens as a dependent variable and a separation distance between the lens and the thermal barrier surface as independent variables;
b) detecting a reference separation distance corresponding to a change in ice making temperature during the surface temperature change through the regression analysis;
c) deriving a correlation between the reference separation distance detected for each light source and the output of the light source
Wherein the lamp is a lamp. The method according to claim 1,
Wherein the surface temperature change means a difference between a surface temperature of the lens when the light source is turned off and a surface temperature of the lens when the light source is turned on. 3. The method of claim 2,
Wherein the change in the ice making temperature means a difference between a surface temperature of the lens in a state in which the light source is turned off and a surface temperature of the lens in which the ice making is performed in a state in which the light source is turned on. The method according to claim 1,
Wherein the distance is a distance between the lens and the heat-radiation surface with respect to the optical axis direction. The method according to claim 1,
Wherein the light source is a light emitting diode. Light source;
A lens disposed in front of the light source;
And a bezel portion connecting the light source and the lens, the bezel portion being made of a thermally conductive material and including a thermal barrier surface,
Wherein the lens and the thermal barrier are spaced apart from each other by a reference separation distance and the reference separation distance is detected through a regression analysis using a change in the surface temperature of the lens as a dependent variable and a separation distance between the lens and the thermal barrier surface as independent variables Wherein the temperature of the surface of the lamp corresponds to a change in the temperature of the ice making operation in which the ice making is performed during the surface temperature change. The method according to claim 6,
Wherein the surface temperature change means a difference between a surface temperature of the lens when the light source is off and a surface temperature of the lens when the light source is turned on. 8. The method of claim 7,
Wherein the change in the ice making temperature means a difference between a surface temperature of the lens in a state in which the light source is turned off and a surface temperature of the lens in which the ice making is performed in a state in which the light source is turned on. The method according to claim 6,
Wherein the spacing distance is a distance between the lens and the heat-radiation surface with respect to an optical axis direction. The method according to claim 6,
Wherein the light source is a light emitting diode.

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