JP2011071059A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturizable display device for a vehicle with excellent heat discharge performance. <P>SOLUTION: The display device 1 for a vehicle is mounted on a mount part at the upper front side or the upper rear side of the vehicle, and includes a plurality of LED lamps 20, a substrate 30 on which the LED lamps are mounted linearly and which is arranged tilted to the mount part so that the optical axes of the LED lamps are parallel to the moving direction of the vehicle, an inner lens 40 attached to the substrate to cover the light emitting side of the LED lamps and having slits 41, 42 formed so that their ends along the layout direction of the LED lamps are partially separated from the substrate, and an electronic circuit element forming the circuit for the LED lamps and mounted at the position facing the slits of the substrate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of a vehicle display device.

  2. Description of the Related Art Conventionally, large vehicles such as buses and trucks are provided with a light emitting device at the upper front or rear upper portion of the vehicle to display the vehicle height position at night. Examples of this light emitting device are disclosed in Patent Documents 1 and 2. In addition, although it is not the light-emitting device which displays a vehicle height position, the example of the light-emitting device for vehicles which distributes the light of a light source to a several direction with an outer lens is disclosed by patent document 3. FIG.

JP-A-2005-302307 JP 2007-214094 A JP 2005-280657 A

Since the resistor between the LED lamps is arranged in the configuration of Patent Document 1, if the device is downsized, the LED lamp and the resistor are too close to each other, and the LED lamp is easily affected by the heat of the resistor. Therefore, it is not preferable. Further, if the inner lens is simply provided in the configuration of Patent Document 1, the heat of the electronic circuit elements such as the LED lamp and the resistor is trapped in the inner lens, which causes a problem. Furthermore, when not lit, the resistor disposed between the LED lamps is visually recognized from the outside, and the appearance is poor. In the configuration of Patent Document 2, an LED lamp is disposed on the front surface of the substrate using a double-sided substrate, and an electronic circuit element such as a resistor is disposed on the back surface of the substrate, thereby separating the LED lamp from the electronic circuit element. Although the apparatus is downsized, using a double-sided substrate is expensive. In the configuration of Patent Document 3, the influence of the heat of the electronic circuit element on the LED lamp is not particularly taken into consideration, and if the inner lens is simply provided as in Patent Document 1, heat is accumulated in the inner lens, which causes a problem. It becomes.
Accordingly, an object of the present invention is to provide a vehicle display device that can be downsized and has excellent heat dissipation. Another object is to provide a vehicle display device that is advantageous in terms of cost. Another object is to provide a highly visible structure as a display device for vehicle height display.

In order to achieve the above object, a first aspect of the present invention has the following configuration. That is,
A display device for a vehicle having a front upper part or a rear upper part of a vehicle as an installation part,
A plurality of LED lamps;
A plurality of LED lamps arranged in a line and mounted; and a substrate disposed inclined with respect to the installation portion so that an optical axis of the plurality of LED lamps is parallel to a traveling direction of the vehicle; ,
An inner lens provided with a slit portion that is attached to the substrate so as to cover the light emission side of the plurality of LED lamps, and is formed with a part of an end portion along the arrangement direction of the plurality of LED lamps being separated from the substrate. When,
An electronic circuit element that forms a circuit of the plurality of LED lamps is mounted at a position facing the slit portion of the substrate.

  According to the vehicle display device of the present invention, the inner lens includes a slit portion formed such that a part of the end portion along the arrangement direction of the plurality of LED lamps is separated from the substrate, and the circuit of the plurality of LED lamps is provided. The electronic circuit element to be formed is provided at a position facing the slit portion of the substrate. As a result, the electronic circuit element is arranged along the arrangement direction of the plurality of LED lamps and is arranged in the slit portion. Thereby, it is promoted that the heat of the electronic circuit element is radiated from the inner lens to the outside through the slit portion, and the heat is prevented from being accumulated in the inner lens portion. Thereby, it becomes the structure excellent in heat dissipation. Further, by arranging the LED lamp and the electronic circuit element in this way, even if the apparatus is downsized, the LED lamp and the electronic circuit element are not excessively close to each other, and the influence of heat on the LED lamp is reduced. Moreover, even if it is mounted on one side of the substrate, the LED lamp and the electronic circuit element are not excessively close to each other, so that it is not necessary to use a double-sided substrate and the cost can be reduced.

FIG. 1A is a front perspective view of a bus 100 including a vehicle display device 1 according to an embodiment of the present invention, and FIG. 1B is a front view of the vehicle display device 1. 2 is a cross-sectional view taken along line AA in FIG. 1B. 3A is a rear view of the outer lens 50, FIG. 3B is a sectional view taken along line BB in FIG. 3A, and FIG. 3C is a sectional view taken along line CC.

  The vehicle display device of the present invention uses the front upper part or the rear upper part of the vehicle as an installation part. Thereby, it functions as a display device that displays the height (vehicle height) of the vehicle in a dark place such as at night. The vehicle display device of the present invention can be provided, for example, at the upper left and right corners of the front of the vehicle.

  The vehicle display device of the present invention includes a plurality of LED lamps as light sources. The type of the LED lamp is not particularly limited, and may be a surface mount type (SMD type) LED lamp, a bullet type LED lamp, etc., among which the surface mount type LED is preferable. This is because the surface mount type LED lamp has a larger directivity angle than the bullet type LED lamp and can illuminate light over a wide range. The number of LED lamps to be used is not particularly limited, and can be determined in consideration of the size and shape of the substrate.

  In the vehicle display device of the present invention, the plurality of LED lamps are linearly arranged and mounted on the substrate. The kind of board | substrate is not specifically limited, The board | substrate made from high heat dissipation, such as the product made from ceramics, the product made from AlN, can be used. The substrate is disposed to be inclined with respect to the installation portion so that the optical axes of the plurality of LED lamps are parallel to the traveling direction of the vehicle. For example, by arranging the board to be inclined at about 30 ° to about 60 ° with respect to the installation part, the optical axes of a plurality of LED lamps mounted on the board may be parallel to the traveling direction of the vehicle. it can. The plurality of LED lamps are linearly arranged in the width direction of the vehicle.

  An inner lens is attached to the substrate so as to cover the light emission side of the plurality of LED lamps. The inner lens is made of a translucent material. An inner lens is provided with the slit part in which a part of edge part along the sequence direction of a some LED lamp is spaced apart and formed from a board | substrate. You may provide the said slit part in the whole region of the edge part along the sequence direction of a some LED lamp. In the slit portion, the distance between the substrate and the inner lens (also referred to as “separation distance” in this specification) is about 1.0 mm to about 20.0 mm, preferably about 2, 0 mm to about 15 mm, more preferably It can be about 3, 0 mm to about 10.0 mm. The said separation distance may be uniform over the whole slit part, and the separation distance of a one part area | region may differ from the separation distance of another area | region. For example, the said separation distance may become large gradually toward the center part from the edge part of a slit part. You may form a slit part intermittently along the sequence direction of a some LED lamp. For example, a plurality of slit portions can be provided at predetermined intervals along the arrangement direction of the plurality of LED lamps.

  The slit portions are preferably formed at both end portions along the arrangement direction of the plurality of LED lamps so as to sandwich the plurality of LED lamps. According to such an arrangement, the slit portions are arranged above and below the plurality of LED lamps, and an air flow is generated from the lower slit portion toward the upper slit portion, thereby improving heat dissipation. is there.

  Electronic circuit elements that form a plurality of LED lamp circuits are mounted at positions facing the slits on the substrate. Thereby, it is promoted that the heat of the electronic circuit element is radiated from the inner lens to the outside through the slit portion, and the heat is prevented from being accumulated in the inner lens portion. Thereby, it becomes the structure excellent in heat dissipation. In addition, by arranging the LED lamp and the electronic circuit element in this manner, the LED lamp and other electronic circuit elements can be mounted on one side of the board, so that it is not necessary to use a double-sided board and the cost is reduced. it can.

  In the second aspect of the present invention, in addition to the configuration of the first aspect, the intersection of the housing for housing the plurality of LED lamps, the substrate, and the inner lens, and the optical axis of the plurality of LED lamps is located at the lower end. An outer lens having a first region and a second region located below the first region, wherein a vertical step is formed in the first region, and a fly-eye step is formed in the second region. It is the display apparatus for vehicles.

  The first region of the outer lens is formed at the lower end of which the intersection of the outer lens and the optical axes of the plurality of LED lamps is positioned in parallel with the arrangement direction of the plurality of LED lamps (that is, the width direction of the vehicle). The vertical step formed in the first region is a step extending parallel to the vertical direction of the vehicle. The step width can be appropriately determined in consideration of the design properties and the light distribution characteristics of the LED lamp. For example, the step width is provided at equal intervals, or the step width of the area facing the LED lamp (LED lamp facing area) is narrowed. The step width of the area between the LED lamp facing areas may be increased. Due to the first region in which the vertical steps are formed, the light from the plurality of LED lamps is actively diffused in the width direction of the vehicle. Visibility from the outside is enhanced by positively diffusing in the width direction in the first region having a large amount of light to reach.

The second region of the outer lens is provided below the first region. The fly eye step formed in the second region is a grid-like step. The step interval (grating size) of the fly-eye step can be appropriately determined in consideration of the design properties and the light distribution characteristics of the LED lamp. For example, the step interval is intermittently set as the distance from the first region is increased. It may be enlarged continuously or continuously. Due to the second region in which the fly-eye step is formed, light from the plurality of LED lamps is diffused in the vertical direction as well as in the width direction. Accordingly, the display area of the display device is prevented from being observed in a line along the arrangement direction of the plurality of LED lamps, and is observed by emitting light in a planar shape, thereby increasing visibility from the outside.
In addition, the intersection of the plurality of LED lamps is located at the lower end of the first region, and the second region is located below the first region, so that the light of the plurality of LED lamps is positive in the width direction in the first region. In addition to being diffused in the vertical direction in the second region, the display region of the display device can be satisfactorily observed when viewed from below.

  Preferably, the outer lens includes a third region in which a fly-eye step is formed above the first region, and the second region and the third region are formed symmetrically with the first region interposed therebetween. This is because the appearance when turned off is improved.

The plurality of LED lamps are preferably arranged in parallel to the width direction of the vehicle, and the first region is preferably formed in a strip shape parallel to the width direction of the vehicle. This is because light is diffused from the first region in the width direction of the vehicle, and visibility from the width direction is improved.
Examples of the present invention will be described in detail below.

  FIG. 1A shows a front perspective view of a bus 100 including a vehicle display device 1 according to an embodiment of the present invention, and FIG. 1B shows a front view of the vehicle display device 1. As shown in FIG. 1A, the vehicle display device 1 is disposed at the left and right corners of the front upper portion of the bus 100. As shown in FIG. 1B, the vehicle display device 1 has an outer shape that is substantially rectangular in plan view, and is arranged such that its longitudinal direction is parallel to the width direction of the bus 100. Screws 10 are provided on the left and right short side edges of the vehicle display device 1 and are fixed to the bus 100 via the screws 10. A substrate 30 is provided inside the vehicle display device 1. The substrate 30 has a long plate shape, and the LED lamp 20 and resistors 31, 32, and 33 are mounted thereon. Five LED lamps 20 are mounted and arranged in the center of the substrate 30 in a line along the longitudinal direction at equal intervals. The LED lamp 20 is a surface mount type LED lamp. The resistor 31 is disposed at the upper center of the substrate 30, the resistor 32 is disposed at the lower right side, and the resistor 33 is disposed at the lower left side.

A cross-sectional view taken along line AA in FIG. 1B is shown in FIG. Since the left and right corners of the front upper portion of the bus 100 where the vehicle display device 1 is installed are inclined so as to be continuous with the vehicle ceiling, the substrate 30 has an optical axis 21 of the LED lamp 20 as shown in FIG. It is fixed to the housing 60 in an inclined state with respect to the front surface of the bus 100 so as to be parallel to the traveling direction of the bus 100. By inclining and fixing to the housing 60 in this manner, the lower edge portion of the substrate 30 is disposed in the dead space of the housing 60, and the space in the housing 60 is effectively utilized. This contributes to downsizing of the device.

  The substrate 30 is provided with an inner lens 40 that collectively covers the light emitting sides of the five LED lamps 20. The planar view shape of the inner lens 40 is substantially the same as the planar view shape of the substrate 30, and the longitudinal cross-sectional shape is substantially U-shaped. The surface opposite to the surface facing the LED lamp 20 (that is, the light emission surface) is a Fresnel lens surface. Of the end portions of the inner lens 40, both end portions on the side are bonded to the substrate 30. On the other hand, the upper end portion of the inner lens 40 along the arrangement direction of the LED lamps 20 is separated from the substrate 30 by about 5.0 mm to form an upper slit portion 41. Similarly, a lower slit portion 42 is formed at a lower end portion of the inner lens 40 along the arrangement direction of the LED lamps 20 so as to be separated from the substrate 30 by about 5.0 mm. The upper slit portion 41 and the lower slit portion 42 are formed so as to sandwich the six LED lamps along the arrangement direction of the LED lamps 20.

  The resistor 31 described above is disposed at a position facing the upper slit portion 41, and the resistors 32 and 33 described above are disposed at positions facing the lower slit portion 42, respectively. With such an arrangement, heat from the resistors 31, 32, and 33 is radiated to the outside of the inner lens 40 through the upper slit portion 41 and the lower slit portion 42, and heat dissipation is improved. Further, an air flow is generated in the direction from the lower slit portion 42 to the upper slit portion 41, so that heat is not trapped in the inner lens 40, and heat dissipation is further improved. In addition, according to such an arrangement, the LED lamp 20 and the resistors 31, 32, and 33 are arranged apart from each other as compared with the case where the resistors are arranged between the arranged LED lamps 20. Thus, the influence of the heat of the resistors 31, 32, 33 on the LED lamp 20 is reduced. Thus, even if the LED lamp 20 and the resistors 31, 32, 33 are arranged on the same surface of the substrate 30, sufficient heat dissipation is obtained, so there is no need to use a double-sided substrate, which is advantageous in terms of cost. It becomes. Further, according to such an arrangement, the LED lamps 20 can be arranged more densely than in the case where the resistors are arranged between the arranged LED lamps 20, which contributes to the miniaturization of the vehicle display device 1. To do.

  As shown in FIG. 2, the vehicle display device 1 includes an outer lens 50 that forms a design surface. The outer lens 50 includes a first area 51, a second area 52, and a third area 53. The first region 51 is formed in a belt shape in the vehicle width direction at the approximate center of the design surface of the outer lens 50. The design surface of the outer lens 50 is vertically divided into a first region 51, a lower region is a second region 52, and an upper region is a third region 53. Thereby, the second region 52 and the third region 53 are formed symmetrically with the first region 51 interposed therebetween. The intersection point 22 between the optical axis 21 and the outer lens 50 is located at the lower end of the first region 51 (that is, the boundary between the first region 51 and the second region 52).

A rear view of the outer lens 50 is shown in FIG. 3A, a cross-sectional view taken along line BB in FIG. 3A is shown in FIG. 3B, and a cross-sectional view taken along line CC is shown in FIG. As shown in FIG. 3A, in the first region 51, vertical steps having a width of about 3.0 mm parallel to the vertical direction of the bus 100 are formed at equal intervals. By the vertical step, the back surface of the first region 51 has a lenticular shape in which a cylindrical surface is continuous in the width direction. On the other hand, in the second region 52 and the third region 53, lattice-like fly eye steps having a side of about 3.0 mm are formed at equal intervals. Due to the fly-eye step, the convex lens surface has a continuous shape in a matrix.

  Next, the display mode of the vehicle display device 1 will be described. The LED lamp 20 is lit in conjunction with the lighting of the vehicle width lamp at night or in a dark place. Of the light from the LED lamp 20, the light that has passed through the inner lens 40 and reached the first region 51 is actively diffused in the width direction by the vertical step formed on the back surface of the first region 51, and the outer lens. 50 is discharged to the outside. Thereby, the visibility of the vehicle display device 1 from the width direction or the lateral direction of the bus 100 is improved. On the other hand, of the light from the LED lamp 20, the light that has passed through the inner lens 40 and reached the second region 52 is diffused widely in the vertical and width directions by the fly-eye step formed on the back surface of the second region 52. And is emitted from the outer lens 50 to the outside. Thereby, the 2nd field 52 is observed by carrying out sheet-like light emission, and visibility improves. Similarly, the light that has passed through the inner lens 40 and has reached the third region 53 among the light from the LED lamp 20 is also moved in the vertical direction and the width direction by the fly-eye step formed on the back surface of the third region 53. It is diffused widely and emitted to the outside, and the third region 53 is observed with planar light emission to improve visibility. Thus, by having the 1st field 51 in which the vertical step was formed, and the 2nd field 52 and the 3rd field 53 in which the fly eye step was formed, the vehicular display 1 is widely visible in the width direction. Since the visibility increases due to the planar light emission, the vehicle display device 1 with high visibility is obtained by these synergistic effects.

  Since the LED lamp 20 is disposed so that the optical axis 21 is positioned at the lower end of the first region 51, most of the light from the LED lamp 20 enters the first region 51 and the second region 52. Since the display device 1 disposed at the upper front portion of the bus 100 is normally viewed from below, the light is positively incident on the first first region 51 and the second second region 52 below the center in this way, Visibility from below is improved. In addition, since the substrate 30 is inclined with respect to the front surface of the bus 100, the LED lamp 20 is disposed in the vicinity of the first region 51. As a result, the loss of light incident on the first region 51 is reduced and the light utilization rate is improved.

  On the other hand, since the third region 53 and the second region 52 are formed symmetrically up and down with the first region 51 in between, the appearance when the light is turned off is good. Moreover, since each resistor 31,32,33 is located behind the upper side slit part 41 or the lower side slit part 42, it becomes difficult to visually recognize at the time of light extinction, and appearance looks good.

  The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

1 Vehicle display device 100 Bus 10 Screw 20 LED lamp 30 Substrate 31, 32, 33 Resistor 40 Inner lens 41 Upper slit portion 42 Lower slit portion 50 Outer lens 51 First region 52 Second region 53 Third region 60 Housing

Claims (6)

A display device for a vehicle having a front upper part or a rear upper part of a vehicle as an installation part,
A plurality of LED lamps;
The plurality of LED lamps are mounted in a linear arrangement, and are inclined with respect to the installation portion so that the optical axes of the plurality of LED lamps are parallel to the traveling direction of the vehicle. A substrate,
An inner lens provided with a slit portion that is attached to the substrate so as to cover the light emission side of the plurality of LED lamps, and is formed with a part of an end portion along the arrangement direction of the plurality of LED lamps being separated from the substrate. When,
An electronic display device for forming a circuit of the plurality of LED lamps is mounted at a position facing the slit portion of the substrate.   2. The vehicle display device according to claim 1, wherein, in the inner lens, the slit portion is formed at both end portions along an arrangement direction of the plurality of LED lamps so as to sandwich the plurality of LED lamps.   The vehicle display device according to claim 1, wherein the electronic circuit element is a resistor. A housing for housing the plurality of LED lamps, the substrate, and the inner lens;
An outer lens having a first region where an intersection with an optical axis of the plurality of LED lamps is located at a lower end, and a second region located below the first region;
With
The vehicle display device according to claim 1, wherein a vertical step is formed in the first region, and a fly-eye step is formed in the second region.   5. The outer lens includes a third region in which a fly-eye step is formed above the first region, and the second region and the third region are formed symmetrically across the first region. The vehicle display device described in 1.   The vehicle display device according to claim 5, wherein the plurality of LED lamps are arranged in parallel to the width direction of the vehicle, and the first region of the outer lens is formed in a belt shape parallel to the width direction of the vehicle. .

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