WO2021149793A1

WO2021149793A1 - Head-up display

Info

Publication number: WO2021149793A1
Application number: PCT/JP2021/002206
Authority: WO
Inventors: 文吉金子; 長谷川　達也; 航齋藤; 岳林; 舞伊藤
Original assignee: 日本精機株式会社
Priority date: 2020-01-23
Filing date: 2021-01-22
Publication date: 2021-07-29
Also published as: JPWO2021149793A1; CN218413059U

Abstract

A configuration in which a heat-radiating member is fixed to a housing via a retaining member, wherein stress that may be produced in the fastening part on the housing side is reduced. Disclosed is a head-up display (1) comprising: a housing (2); a heat-radiating member (7) having a planar substrate placement region (70A); a substrate (60) on which a light source (60A) is mounted and which is placed in the substrate placement region; one or more lens members (34, 36, 38) which face the substrate in a substrate-perpendicular direction perpendicular to the substrate placement region, light radiated from the light source being transmitted through the lens members (34, 36, 38); and a retaining member (30) for retaining the one or more lens members, the retaining member (30) being fixed to the housing and the heat-radiating member. The heat-radiating member has a plurality of first attachment leg parts (72) outside the substrate placement region as viewed in the substrate-perpendicular direction, each of the plurality of first attachment leg parts extends so as to overlap with the retaining member as viewed in the direction orthogonal to the substrate-perpendicular direction, and the retaining member has a plurality of fastening parts (302) fastened to end surfaces of the plurality of first attachment leg parts.

Description

Head-up display

This disclosure relates to a head-up display.

A technique is known in which a substrate is sandwiched between a holding member that holds a lens member and a heat sink (heat dissipation member), and the holding member is fixed to the mounting surface of the heat sink with screws.

JP-A-2017-126468

By the way, in the configuration in which the heat radiating member is fixed to the housing via the holding member, the fastening portion between the heat radiating member and the holding member (referred to as "the heat radiating member side fastening portion") is between the holding member and the housing. Since it is separated from the fastening portion (referred to as “housing side fastening portion”) by a relatively long distance in the vertical direction of the substrate, it is difficult to secure the required strength at the housing side fastening portion. Because of the large size, a relatively large load may be applied to the heat dissipation member side fastening part due to vibration or the like, and the moment arm length becomes relatively long with respect to the point of action of the applied load, so that the housing side fastening part is affected. The structure is such that relatively high stress is likely to occur.

Therefore, an object of the present disclosure is to reduce the stress that may occur at the fastening portion on the housing side in a configuration in which the heat radiating member is fixed to the housing via the holding member.

On one side, the housing and
A heat radiating member having a flat substrate mounting area and
A substrate on which a light source is mounted and mounted in the substrate mounting area,
One or more lens members that face the substrate in the direction perpendicular to the substrate, which is the direction perpendicular to the substrate mounting region, and transmit the light emitted from the light source.
It is provided with a holding member fixed to the housing and the heat radiating member and holding the one or more lens members.
The heat radiating member has a plurality of first mounting legs on the outside of the board mounting area when viewed in the vertical direction of the board.
Each of the plurality of first mounting legs extends so as to overlap the holding member when viewed in a direction orthogonal to the substrate vertical direction.
A head-up display is disclosed in which the holding member has a plurality of first fastening portions to be fastened to the end faces of the plurality of first mounting legs.

According to the present disclosure, in a configuration in which the heat radiating member is fixed to the housing via the holding member, it is possible to reduce the stress that may occur at the fastening portion on the housing side.

It is a perspective view which shows the internal structure of the head-up display by one Example from the upper side. It is a perspective view which shows the head-up display from the lower side. It is a perspective view which shows the TFT panel unit. It is a perspective view which shows the backlight unit and a heat dissipation member. It is a figure which shows roughly the vehicle-mounted state of the head-up display in the vehicle side view. It is a perspective view explaining the coupling mode of a TFT panel unit and a heat dissipation member. It is an exploded perspective view of a backlight unit and a heat dissipation member. It is a perspective view which shows the case and an assembly. It is an exploded perspective view which separated the assembly from a case. It is a perspective view which shows the internal structure of the TFT panel unit. It is explanatory drawing of the assembly procedure of the component on the A direction A1 side of a light box. It is explanatory drawing of the assembly procedure of the component on the A direction A2 side of a light box. It is a perspective view of the lenticular lens seen from the A1 side in the A direction. It is a perspective view of the lenticular lens seen from the A2 direction A2 side. It is explanatory drawing of the assembly of a lenticular lens. It is sectional drawing which shows the state of the selvage part of each lenticular lens in a positioning groove. It is a perspective view of the condenser lens seen from the A1 side in the A direction. It is a perspective view of the condenser lens seen from the A2 direction A2 side.

Hereinafter, each embodiment will be described in detail with reference to the attached drawings. In FIG. 1A and the like, for the sake of legibility, a plurality of parts or parts having the same attribute may have reference numerals only partially attached to them.

[Head-up display configuration]
FIG. 1A is a perspective view showing the internal configuration of the head-up display 1 according to the embodiment from above. FIG. 1B is a perspective view showing the head-up display 1 from below. FIG. 1C is a perspective view showing the TFT panel unit 3. FIG. 1D is a perspective view showing the backlight unit 6 and the heat radiating member 7. FIG. 2 is a diagram schematically showing a vehicle-mounted state of the head-up display 1 when viewed from the side of the vehicle. Note that in FIGS. 1A and 1B, the illustration of some components of the head-up display 1 is omitted. In FIG. 1A and the like, the X direction, the Y direction, and the Z direction, which are three directions orthogonal to each other, are defined in the right-handed system. In the following, formally, the Z direction is the vertical direction, the positive side is the upper side, and the negative side is the lower side.

The head-up display 1 is mounted in the instrument panel 9 of the vehicle VC. The head-up display 1 may be mounted in a direction in which the Y direction of FIG. 1A substantially corresponds to the vehicle width direction.

The head-up display 1 includes a case 2 (an example of a housing), a TFT (Thin Film Transistor) panel unit 3, a reflector unit 4, a concave mirror 5, a backlight unit 6, and a heat radiating member 7.

The case 2 forms the housing of the head-up display 1. The case 2 is a middle case that forms an intermediate portion of the housing of the head-up display 1. The case 2 is provided between the upper case and the lower case 2C (see FIG. 1B), which are not shown in FIG. 1A.

Case 2 is formed of, for example, resin. The case 2 may be formed of two or more members.

The TFT panel unit 3 is fixed to the case 2. The TFT panel unit 3 is a display device that uses the light from the backlight unit 6 as a backlight to emit display light according to the display image. The TFT panel unit 3 of this embodiment includes a dot matrix type TFT (Thin Film Transistor) panel 3A (see FIG. 1C). The display image is arbitrary, and may be, for example, an image representing navigation information, various vehicle information, and the like.

The reflector unit 4 is fixed to the case 2. The reflecting mirror unit 4 includes a plane mirror 41, and reflects the display light emitted from the TFT panel unit 3 toward the concave mirror 5.

The concave mirror 5 is fixed to the case 2. The concave mirror 5 is rotatably supported with respect to the case 2 so that the vertical position of the area exposed to the display light in the windshield WS can be adjusted. The concave mirror 5 reflects the display light reflected by the reflector unit 4 and emits it from an outlet provided in the upper case (not shown) so as to face the windshield WS of the vehicle VC.

The backlight unit 6 is provided behind the TFT panel unit 3 (negative side in the Y direction). The backlight unit 6 includes, for example, a substrate 60 on which an LED 60A (Light Emitting Diode) is mounted. The substrate 60 may be placed on the heat radiating member 7 as shown in FIG. 1D. The backlight unit 6 cooperates with the TFT panel unit 3 to generate display light.

The heat radiating member 7 is formed of a material having high heat transfer properties such as aluminum. The heat radiating member 7 is attached to the case 2 in such a manner that the fins 71 are exposed to the outside of the case 2. The heat radiating member 7 has a function of radiating heat generated from the backlight unit 6. The heat radiating member 7 releases heat to the air flowing outside the case 2.

In such a head-up display 1, as shown in FIG. 2, when the windshield WS is irradiated with the display light, the driver who drives the vehicle VC obtains the windshield WS in front of the windshield WS by the irradiation. The displayed display image (virtual image display) VI can be seen. As a result, the driver can visually recognize the displayed image VI by superimposing it on the front scenery, and can grasp the vehicle information and the like in a mode in which the line of sight movement is small, and the convenience and safety are improved.

[Structure of TFT panel unit 3 and heat dissipation member 7]
Next, the TFT panel unit 3, the backlight unit 6, and the heat radiating member 7 will be further described.

FIG. 3 is a perspective view illustrating a mode of connecting the TFT panel unit 3 and the heat radiating member 7. FIG. 4 is an exploded perspective view of the backlight unit 6 and the heat radiating member 7. In FIG. 3, only the light box 30 is shown as the TFT panel unit 3. Further, in FIG. 3, the A direction, the B direction, and the C direction, which are three directions orthogonal to each other, are defined, and the A1 side, the A2 side, and the like are defined in each direction. The A direction corresponds to the direction perpendicular to the substrate 60, the B direction corresponds to the lateral direction (longitudinal direction) of the TFT panel, and the C direction corresponds to the vertical direction (short direction) of the TFT panel.

The TFT panel unit 3 includes a light box 30. As will be described later, the light box 30 functions as a holding member for holding various components of the TFT panel unit 3. The TFT panel unit 3 is fixed to the case 2 by connecting the light box 30 to the case 2.

The light box 30 includes a main body 301, a fastening portion 302 (an example of a first fastening portion), a mounting leg portion 303 (an example of a second mounting leg portion), and a mounting portion 304 (a part of which is visible in FIG. 3). However, it includes (see FIG. 1C).

The main body 301 has a tubular shape and forms an internal space in which various components of the TFT panel unit 3 (components other than the light box 30 and the TFT panel 3A) are housed. Hereinafter, the inside of the main body 301 refers to the internal space side, and the outside of the main body 301 refers to the side opposite to the internal space side. The internal space of the main body 301 has a rectangular outer shape corresponding to the outer shape of the TFT panel 3A when viewed in the A direction.

A plurality of fastening portions 302 are provided (four in this embodiment). Each of the fastening portions 302 is arranged outside the main body portion 301. That is, each of the fastening portions 302 extends from the outer surface of the main body portion 301 to the outside (direction intersecting in the A direction). The four fastening portions 302 are arranged at four corners of the main body portion 301 (each corner of a rectangle corresponding to the outer shape of the TFT panel 3A) when viewed in the A direction.

Each of the fastening portions 302 has a fastening hole 302B penetrating in the A direction. Further, of the four fastening portions 302, the two fastening portions 302 that are diagonally related have a positioning projection 302A that protrudes in the A direction, as shown in FIG.

The mounting leg portion 303 is arranged outside the main body portion 301. The mounting leg 303 extends in a direction away from the heat radiating member 7 (that is, on the A1 side in the A direction). The mounting leg portion 303 is formed from one side surface of the main body portion 301 (a side surface related to one side of a rectangle corresponding to the outer shape of the TFT panel 3A), and extends in a manner toward the B direction B1 side as it goes toward the A direction A1 side. ..

The mounting leg portion 303 has a fastening portion 3031 at the end on the A1 side in the A direction. As shown in FIG. 3, the fastening portion 3031 may have a positioning hole 3031A and a fastening hole 3031B.

The mounting portion 304 is arranged outside the main body portion 301. The mounting portion 304 extends from the outer surface of the main body portion 301 to the outside (direction intersecting in the A direction). The mounting portion 304 is a side surface side facing the side surface on which the mounting leg portion 303 is formed among the four side surfaces of the main body portion 301 (side surfaces related to each side of the rectangle corresponding to the outer shape of the TFT panel 3A). It is provided in. For example, as shown in FIG. 1C, the mounting portions 304 may be arranged on both sides in the C direction related to the side surface. Each of the mounting portions 304 may have a positioning hole 3041A and a fastening hole 3041B, as shown in FIG. 1C.

The backlight unit 6 includes a substrate 60 on which a plurality of LEDs 60A (see FIG. 1D) are mounted. The substrate 60 is provided on the heat radiating member 7 in such a manner that the surface on the A direction A1 side of the heat radiating member 7 is in surface contact with the surface on the A direction A2 side. As shown in FIG. 4, the substrate 60 has a positioning hole 61, a fastening hole 62, and an insertion hole 64. In this embodiment, as an example, the positioning holes 61 are provided on both sides in the B direction, and the fastening holes 62 are provided in the center in the B direction and on the C1 side in the C direction.

The substrate 60 is fixed to the heat radiating member 7 by a fastener 90 (see FIG. 4) that passes through the fastening hole 62. The fastener 90 is, for example, in the form of a screw.

Further, the substrate 60 is provided with Z-shaped terminals 92 (two in the example shown in FIG. 4). The Z-shaped terminal 92 is electrically connected to a grounding conductor (not shown) of the substrate 60. The grounding conductor may be realized by a solid copper pattern or the like. In this case, the grounding conductor may be formed in the inner layer of the substrate 60. The Z-type terminal 92 is electrically connected to the display shield 39 (see FIG. 7) of the TFT panel unit 3 described later. As a result, the display shield 39 is grounded, and a shield function (for example, a function of protecting the TFT panel 3A from static electricity or the like) by the display shield 39 is realized.

Further, the connector 94 is mounted on the board 60. The connector 94 is an interface for electrically connecting the mounting component on the board 60 and an external device (not shown).

The heat radiating member 7 is coupled to the light box 30 by fixing the mounting legs 72, which will be described later, to the fastening portion 302 of the light box 30. The light box 30 is fixed to the case 2 as described above. Therefore, the heat radiating member 7 is fixed to the case 2 via the light box 30.

As shown in FIG. 4, the heat radiating member 7 includes a base 70, fins 71, and mounting legs 72 (an example of the first mounting legs). The base 70, the fins 71, and the mounting legs 72 may be integrally formed.

The base 70 extends in a plane perpendicular to the A direction, and forms a flat substrate mounting area 70A on the A1 side in the A direction. In the base 70, the substrate 60 is mounted on the substrate mounting area 70A.

In this embodiment, the heat radiating member 7 abuts on the substrate 60 along the surface within the substrate mounting area 70A of the base 70. That is, the heat radiating member 7 directly contacts the substrate 60 without interposing another member such as a thermal sheet. As a result, the number of parts and the cost can be reduced as compared with the case where another member such as a thermal sheet is interposed.

The surface of the base 70 is preferably post-processed by cutting in the substrate mounting area 70A. As a result, the surface accuracy is improved, and the thermal resistance between the base 70 and the substrate 60 can be effectively reduced. That is, when the substrate mounting region 70A of the base 70 has fine irregularities (relatively large surface roughness), the surface contact between the base 70 and the substrate 60 is impaired, and the surface contact between the base 70 and the substrate 60 is impaired. There is a risk that the desired surface contact will not be achieved. On the other hand, by increasing the smoothness of the surface in the substrate mounting area 70A by cutting, such inconvenience can be reduced.

The base 70 has a positioning hole 70B for positioning with the condenser lens 38, which will be described later. Each of the positioning holes 70B is provided at a position (two places in the embodiment) corresponding to the insertion hole 64 of the substrate 60.

The base 70 has protrusions 702 for positioning at positions corresponding to the positioning holes 61 of the substrate 60 (two locations in this embodiment). Each of the protrusions 702 projects toward the A1 direction in the A direction with respect to the surface of the substrate mounting area 70A. In this case, the substrate 60 is positioned with respect to the heat radiating member 7 by inserting each of the protrusions 702 into each of the positioning holes 61.

The base portion 70 preferably has a peripheral groove 703 recessed in the A direction A2 side around the protrusion 702. The peripheral groove 703 is in the form of a counterbore, and is provided for each of the protrusions 702. The protrusion 702 may be machined when cutting the substrate mounting area 70A of the base 70.

Here, since the protrusion 702 has a positioning function as described above, it is arranged in the substrate mounting area 70A. Therefore, when the protrusion 702 is formed, a slight angle R is inevitably formed at the root thereof (the side continuous with the surface forming the substrate mounting region 70A). In this case, if the area around the positioning hole 61 of the substrate 60 rides on the surface of the angle R, the substrate 60 may float (separate from the surface forming the substrate mounting region 70A).

In this respect, in this embodiment, the peripheral groove 703 is provided to prevent the substrate 60 from floating. That is, by providing the peripheral groove 703, the corner R at the base of the protrusion 702 is formed on the bottom side of the peripheral groove 703, and the contact between the substrate 60 and the corner R (and the accompanying floating of the substrate 60). Is prevented. As a result, the inconvenience caused by the floating of the substrate 60 (the inconvenience that the surface contact between the base 70 and the substrate 60 is impaired and the desired surface contact between the base 70 and the substrate 60 is not realized) can be reduced.

The fin 71 is erected on the surface of the base 70 on the A2 side in the A direction.

A plurality of mounting legs 72 are provided outside the board mounting area 70A when viewed in the A direction. The plurality of mounting legs 72 are fixed to the fastening portions 302 of the light box 30, respectively. In this embodiment, as an example, four mounting leg portions 72 are provided corresponding to the four fastening portions 302. The mounting legs 72 are arranged at four corners of the base 70 (each corner of a rectangle corresponding to the outer shape of the TFT panel 3A) when viewed in the A direction.

Each of the mounting legs 72 extends from the base 70 in the A direction. At this time, each of the mounting legs 72 extends so as to overlap the light box 30 when viewed in a direction orthogonal to the A direction. In this embodiment, the plurality of mounting legs 72 are adjacent to the outer surface of the main body 301 of the light box 30. Specifically, the main body 301 of the light box 30 has recesses 301A recessed inward at four corners (each corner of a rectangle corresponding to the outer shape of the TFT panel 3A) when viewed in the A direction, and the recess 301A has recesss 301A. Each of the mounting legs 72 is partially fitted (ie, except for the outer portion). The extension range of the recess 301A in the A direction substantially coincides with the extension range of the mounting legs 72 in the A direction. It should be noted that each of the mounting legs 72 may be adjacent to the outer surface of the main body 301 of the light box 30 in a direction intersecting the A direction and in contact with or slightly separated from each of the recesses 301A. .. By arranging the mounting legs 72 in this way, the mounting legs 72 also play a role of reinforcing the light box 30, and the rigidity of the light box 30 can be substantially increased.

Each of the mounting legs 72 has a fastening hole 72B on the end face formed on the A1 side in the A direction. Further, each of the two diagonal mounting legs 72 has a positioning hole 72A into which each of the positioning protrusions 302A of the fastening portion 302 fits into the end surface formed on the A1 side in the A direction. Fasteners (for example, screws, not shown) that pass through each of the fastening holes 302B of the fastening portion 302 of the fastening portion 302 of the light box 30 are fastened to each of the fastening holes 72B.

Each of the mounting legs 72 has an end face formed on the A1 side in the A direction extending in the same plane (hereinafter, also referred to as "first plane"). In this embodiment, as an example, the first plane is parallel to the surface of the substrate 60 (that is, extends in a plane including the B direction and the C direction).

In this way, the heat radiating member 7 to which the backlight unit 6 is fixed and the light box 30 are screwed into the fastening hole 72B through the fastening hole 302B of the fastening portion 302 while being positioned by the positioning hole 72A and the positioning projection 302A. It is fixed to each other by being fastened by a fastener to be worn (for example, a screw, not shown). Hereinafter, the backlight unit 6, the heat radiating member 7, and the light box 30 (and the TFT panel unit 3 accordingly) integrated by assembling in this way are also simply referred to as "assembly 67".

Next, a method of fixing the assembly 67 to the case 2 (fastening method) will be described with reference to FIGS. 5 and 6 in addition to FIGS. 3 and 4.

FIG. 5 is a perspective view showing the case 2 and the assembly 67. FIG. 6 is an exploded perspective view of the assembly 67 separated from the case 2.

As shown in FIG. 6, the case 2 has an opening forming portion 20 in a mounting area of the assembly 67 surrounded by the basic surface 201. The basic surface 201 extends in the internal space of the head-up display 1 in a manner of partitioning the space where the reflector unit 4 and the like are provided and the space where the assembly 67 is provided in the A direction.

The opening forming portion 20 has a tubular shape that protrudes from the peripheral basic surface 201 toward the A2 side in the A direction. The opening 20A forms the opening 20A at the end on the A2 side in the A direction. The assembly 67 is fixed to the case 2 in such a manner that the TFT panel 3A faces the opening 20A. At this time, the image forming range of the TFT panel 3A becomes visible from the A direction A1 side of the case 2 through the opening 20A.

Here, the orientation of the surface of the TFT panel 3A is determined from the viewpoint of forming the display image VI, and the mounting orientation of the case 2 is determined from the viewpoint of mountability on the vehicle body. Therefore, the surface of the TFT panel 3A and the basic surface 201 of the case 2 may form a relatively large angle (see, for example, the difference between the heights H1 and H2 in FIG. 6). The opening forming portion 20 has a function of absorbing such a difference in angle.

Case 2 has a fastening portion 22 (an example of a second fastening portion) and a fastening portion 23 (an example of a third fastening portion) around the opening forming portion 20 on the basic surface 201. The light box 30 of the assembly 67 is fastened to the fastening portion 22 and the fastening portion 23.

The fastening portion 22 is fastened to the end face of the mounting leg portion 303 on the A direction A1 side, and the fastening portion 23 is fastened to the end face of the mounting portion 304 on the A direction A1 side.

More specifically, the fastening portion 3031 (see also FIG. 3) of the light box 30 is fastened to the fastening portion 22. As shown in FIG. 6, the fastening portion 22 includes a positioning pin 22A and a boss portion 22B. The fastening portion 22 is positioned with respect to the fastening portion 3031 by passing the positioning pin 22A through the positioning hole 3031A of the fastening portion 3031. The fastening portion 22 and the fastening portion 3031 are fastened with a fastener (for example, a screw, not shown) screwed to the boss portion 22B through the fastening hole 3031B of the fastening portion 3031 in a positioned state. In this case, the fastener is screwed from the heat radiating member 7 side (A direction A2 side).

Two fastening portions 23 are provided corresponding to the two mounting portions 304. A mounting portion 304 (see FIG. 1C) of the light box 30 is fastened to each of the fastening portions 23. Each of the fastening portions 23 includes a positioning pin 23A and a boss portion 23B, as shown in FIG. Each of the fastening portions 23 is positioned with respect to the corresponding mounting portion 304 by the positioning pin 23A passing through the positioning hole 3041A (see FIG. 1C) of the corresponding mounting portion 304. The fastening portion 23 and the mounting portion 304 of each set are fastened to the boss portion 23B through the fastening hole 3041B (see FIG. 1C) of the mounting portion 304 in a positioned state (for example, a screw, not shown). Is concluded by. In this case, the fastener is screwed from the heat radiating member 7 side (A direction A2 side).

In this way, the light box 30 of the assembly 67 is firmly fixed to the case 2.

By the way, as described above, since the heat radiating member 7 has a relatively large mass, a relatively large load may act on the fastening portion between the heat radiating member 7 and the light box 30 due to vibration or the like. When the moment arm length is relatively long with respect to the point of action of such a load, relatively high stress is likely to occur in the fastening portions (

fastening portions

22 and 23 on the case 2 side) between the light box 30 and the case 2. It becomes a structure.

In this regard, according to the present embodiment, in a configuration in which the heat radiating member 7 is fixed to the case 2 via the light box 30 (an example of the holding member), the stress that may occur in the

fastening portions

22 and 23 on the case 2 side is reduced. can. Specifically, in this embodiment, the positions of the fastening portions between the heat radiating member 7 and the light box 30 are defined by the positions of the end faces (end faces formed on the A1 side in the A direction) of the four mounting legs 72. Due to the relatively long mounting legs 72, the position is relatively close to the case 2. More specifically, according to the present embodiment, the heat radiating member 7 and the heat radiating member 7 are compared with the case where the respective lengths H7 (length in the A direction, see FIG. 4) of the mounting legs 72 are substantially 0. The position of the fastening portion with the light box 30 can be set to the A1 side (the side closer to the case 2) in the A direction. As a result, according to the present embodiment, the force acting on the fastening portion between the heat radiating member 7 and the light box 30 is caused as compared with the case where the length of each of the mounting legs 72 is substantially 0. As a result, the moment acting on the fastening portions (

fastening portions

22 and 23 on the case 2 side) between the light box 30 and the case 2 can be reduced. This is because, according to the present embodiment, the moment arm length is reduced by the amount corresponding to the length H7 of the mounting leg portion 72.

Here, from the viewpoint that the longer each length H7 of the mounting legs 72 is, the more the moment acting on the fastening portions (

fastening portions

22 and 23 on the case 2 side) between the light box 30 and the case 2 is reduced. Is advantageous.

In this respect, in this embodiment, the end faces of the mounting legs 72 formed on the A1 side in the A direction are located on the A1 side in the A direction with respect to the condenser lens 38 of the TFT panel unit 3 described later. As a result, the moment acting on the fastening portion between the light box 30 and the case 2 (

fastening portions

22 and 23 on the case 2 side) can be effectively reduced.

Further, when each length H7 (length in the A direction, see FIG. 4) of the mounting legs 72 is substantially 0, each of the fastening portions 302 is arranged on the A2 side in the A direction by that amount. Need arises. In such an arrangement, the depth of each recess (pocket portion) on the A1 side in the A direction of the fastening portion 302 becomes deeper by that amount, and moldability (mold releasability, etc.) deteriorates. It is also disadvantageous from the viewpoint of mold strength. On the other hand, according to the present embodiment, as described above, the respective lengths H7 (length in the A direction, see FIG. 4) of the mounting legs 72 are relatively long, so that such inconvenience is reduced. can.

By the way, in the present embodiment, the end surface of the mounting leg portion 303 on the A direction A1 side and the end surface of the mounting portion 304 on the A direction A1 side extend in the same plane (hereinafter, also referred to as “second plane”). do. In this embodiment, as an example, the second plane is non-parallel to the surface of the substrate 60 (ie, the plane including the B and C directions), so that the second plane is the first plane described above. Tilt (make an angle greater than 0) with respect to (a plane including each end face of the mounting leg 72). As a result, the assembly 67 can be attached to the case 2 in an appropriate orientation while ensuring the necessary parallelism between the TFT panel 3A of the TFT panel unit 3 and the substrate 60 (and the array surface of the LED 60A accordingly). It will be easy.

In particular, in the present embodiment, the above-mentioned first plane and the second plane are inclined with respect to each other in such a manner that the fastening portion 22 has a longer separation distance from the first plane in the A direction than the fastening portion 23. Then, such a difference in separation distance is absorbed not by the fastening portion 22 and the fastening portion 23 on the case 2 side, but by the mounting leg portion 303 and the mounting portion 304 on the light box 30 side. That is, the mounting leg portion 303 extends toward the A1 side in the A direction with respect to the mounting portion 304, thereby absorbing the above-mentioned difference in separation distance. As a result, the case 2 can be easily molded as compared with the case where the above-mentioned difference in separation distance is absorbed by the difference in height (height from the basic surface 201) of the fastening portion 22 and the fastening portion 23 on the case 2 side. , Manufacturability is improved. For example, in a configuration in which the height (extending range in the A direction) of the boss portion 22B (and the positioning pin 22A) is increased instead of shortening the length of the mounting leg portion 303 (extending range in the A direction), the boss portion The structure for ensuring the required strength of 22B becomes complicated, and the moldability is easily impaired. This also applies to the configuration in which a convex portion for absorbing the difference is formed on the basic surface 201. On the other hand, in the present embodiment, as described above, by making the length of the mounting leg 303 of the light box 30 relatively long, the difference in the separation distance described above can be absorbed, so that the structure of the case 2 is constructed. Complexity can be suppressed.

Next, the TFT panel unit 3 will be further described with reference to FIGS. 7 and later, and the method of assembling the TFT panel unit 3 and the heat radiating member 7 will also be described.

FIG. 7 is a perspective view showing the internal configuration of the TFT panel unit 3. In FIG. 7, in order to show the internal configuration of the TFT panel unit 3, the TFT panel unit 3 with the light box 30 removed is shown.

In addition to the TFT panel 3A and the light box 30 (not shown in FIG. 7) described above, the TFT panel unit 3 includes a diffuser plate 32,

lenticular lenses

34 and 36, and a condenser lens 38, as shown in FIG. And include.

The diffusion plate 32 is provided on the back side (A direction A2 side) of the TFT panel 3A. The diffuser plate 32 diffuses and emits the light from the LED 60A (see FIG. 1D) of the backlight unit 6 that is incident through the condenser lens 38 and the

lenticular lenses

34 and 36 toward the A1 side in the A direction. Has the function of The light emitted from the diffuser plate 32 is incident on the TFT panel 3A.

The

lenticular lenses

34 and 36 diffuse and collect the light from the backlight unit 6 that is incident through the condenser lens 38 toward the front surface of the diffuser plate 32 (A1 side in the A direction) and emit the light. Has a function.

The condenser lens 38 is formed of a translucent resin material and is arranged so as to cover the A1 side of the substrate 60 in the A direction. The condenser lens 38 includes a collimator portion having a conical convex outer peripheral surface obtained by rotating a substantially parabolic disconnection. The condenser lens 38 is located so as to face the LED 60A mounted on the substrate 60, and transmits the light radiated from the LED 60A toward the A1 side in the A direction. The outer shape of the condenser lens 38 is a rectangle (a rectangle whose long side is in the B direction) which is substantially the same as the outer shape of the TFT panel unit 3 (and the TFT panel 3A).

FIG. 8 is an explanatory diagram of the procedure for assembling the components on the A1 side of the light box 30 in the A direction.

As shown in FIG. 8, first, the light box 30 is arranged so that the A1 side in the A direction faces upward (S81), and the peripheral edge is placed on the diffusion plate mounting surface 3032 of the light box 30. The diffuser plate 32 is placed on the light box 30 (S82). At this time, the diffuser plate 32 is engaged with the claw portion 30321 provided on the diffuser plate mounting surface 3032 of the light box 30. The diffusion plate mounting surface 3032 preferably has a step on the outer peripheral edge portion according to the outer shape of the diffusion plate 32. As a result, the diffuser plate 32 can be appropriately positioned and placed.

Next, the TFT panel 3A is placed on the upper side of the diffuser plate 32 (S83). At this time, the TFT panel 3A is appropriately positioned by the positioning portion 30323 around the diffusion plate mounting surface 3032 of the light box 30. After that, the cushioning material 300A is attached to the surface of the TFT panel 3A on the A1 side in the A direction (S84), and the display shield 39 is provided (S85). The cushioning material 300A has a function of protecting the surface of the TFT panel 3A on the A1 direction from the display shield 39. The display shield 39 has two legs 39A whose ends on the A2 side in the A direction abut on the Z-shaped terminal 92 on the substrate 60 described above.

FIG. 9 is an explanatory diagram of the procedure for assembling the components on the A2 side of the light box 30 in the A direction. The assembly of the components on the A-direction A2 side of the light box 30 may be executed before the assembly of the components on the A-direction A1 side of the light box 30 (FIG. 8).

As shown in FIG. 9, first, the light box 30 is arranged so that the A2 side in the A direction faces upward (S90), then the lenticular lens 34 is assembled (S91), the lenticular lens 36 is assembled (S92), and then. , Assemble the condenser lens 38 (S93).

10A and 10B are explanatory views of the assembly (S91) of the lenticular lens 34, FIG. 10A is a perspective view of the lenticular lens 34 viewed from the A direction A1 side, and FIG. 10B is a perspective view of the lenticular lens 34 from the A direction A2 side. It is a perspective view of the lenticular lens 34 seen.

The lenticular lens 34 is assembled to the light box 30 by using each positioning groove 3041 and each protrusion 3042 (see the picture of S90 in FIG. 9) provided in the light box 30. The positioning grooves 3041 are provided on both sides in the B direction and are deeply recessed in the A direction. Each of the positioning grooves 3041 realizes the positioning function in the A direction by changing the width in the C direction along the A direction (described later with reference to FIG. 12). The protrusion 3042 is erected on the back surface (the surface on the A2 side in the A direction) of the diffusion plate mounting surface 3032 in the light box 30.

Specifically, as shown in FIG. 10A, the lenticular lens 34 has a flat surface portion 34A that abuts on each of the protrusions 3042 of the light box 30 on the A1 side in the A direction. Further, the lenticular lens 34 has ear portions 34B to be fitted into the positioning groove 3041 on both sides in the B direction. At the time of assembly, each of the ear portions 34B is fitted into each of the positioning grooves 3041 and positioned, and each of the flat surface portions 34A abuts on each of the protrusions 3042 in the A direction, so that the lenticular lens 34 is the TFT panel 3A. It can be assembled properly in the desired orientation parallel to.

Further, the lenticular lens 34 has a protrusion 344 in contact with the lenticular lens 36 on the A2 side in the A direction, as shown in FIG. 10B, in relation to the assembly of the lenticular lens 36. The protrusions 344 are provided at the four corners of the lenticular lens 36.

11 and 12 are explanatory views of the assembly (S92) of the lenticular lens 36. FIG. 11 is a perspective view of the lenticular lens 36 viewed from the A1 side in the A direction, and FIG. 12 is a cross-sectional view showing the states of the

lenticular lenses

34, 36 and the

ears

34B, 36B in the positioning groove 3041. Corresponds to the cross section along the line PP of the picture of S92 of 9.

The lenticular lens 36 includes a fixing hook 3051 provided on the light box 30 (see the picture of S91 in FIG. 9), each positioning groove 3041 of the light box 30 (see the picture of S90 in FIG. 9), and the lenticular lens 34. It is assembled to the light box 30 by using each protrusion 344 (see the picture of S91 in FIG. 9). Two fixing hooks 3051 are provided on one side in the C direction and one on the other side, for a total of three. The fixing hook 3051 regulates the displacement of the lenticular lens 36 toward the A2 side in the A direction by engaging with the engaged portion 36C of the lenticular lens 36.

Specifically, as shown in FIG. 11, the lenticular lens 36 has a flat surface portion 36A that abuts on each of the protrusions 344 of the lenticular lens 34 on the A1 side in the A direction. Further, the lenticular lens 36 has ear portions 36B to be fitted into the positioning groove 3041 on both sides in the B direction. Further, the lenticular lens 36 has two engaged portions 36C on one side in the C direction and one on the other side, for a total of three engaged portions 36C. Each of the engaged portions 36C has a form in which the outer peripheral edge of the lenticular lens 36 projects outward, and is engaged with the fixing hook 3051 described above. At the time of assembly, each of the ear portions 36B is fitted into each of the positioning grooves 3041 and positioned, and each of the flat surface portions 36A abuts on each of the protrusions 3042 in the A direction, so that the lenticular lens 34 is the TFT panel 3A. It can be assembled properly in the desired orientation parallel to. Further, by engaging each of the engaged portions 36C with each of the fixing hooks 3051, the displacement of the lenticular lens 36 toward the A direction A2 side is restricted.

Here, the selvage portion 36B on one side of the lenticular lens 36 in the B direction has a wider width in the C direction than the selvage portion 34B on the one side of the lenticular lens 34 in the B direction. Correspondingly, as shown in FIG. 12, on one side in the B direction, the width of the positioning groove 3041 in the C direction differs depending on the position in the A direction, and the selvage portion 36B is larger than the position where the selvage portion 34B is held. The width in the C direction is wider at the position where the selvage is held, and the width in the C direction becomes narrower from the A2 side in the A direction toward the position where the selvage portion 34B is held. This also applies to the positioning groove 3041 on the other side in the B direction. Thereby, the lenticular lens 34 and the lenticular lens 36 can be held (positioned) in an appropriate positional relationship in the A direction by the positioning groove 3041.

13A and 13B are explanatory views of the assembly of the condenser lens 38 (S93), FIG. 13A is a perspective view of the condenser lens 38 viewed from the A direction A1 side, and FIG. 13B is a perspective view of the condenser lens 38 from the A direction A2 side. It is a perspective view of the condenser lens 38 seen.

The condenser lens 38 is assembled to the light box 30 by using each positioning contact portion 3052 (see the picture of S92 in FIG. 9) provided in the light box 30. The positioning contact portions 3052 are provided diagonally, one on each side in the C direction. Each of the positioning contact portions 3052 has an inclined surface for contact inside in the C direction. The inclination direction of the inclined surface is a direction that spreads outward in the C direction toward the A2 side in the A direction.

Specifically, as shown in FIGS. 13A and 13B, the condenser lens 38 has one contacted portion 382 on each side in the C direction, which abuts each of the positioning contact portions 3052. Each of the contacted portions 382 has an inclined surface for contact. Positioning is realized by abutting the inclined surface of the contacted portion 382 of each set and the inclined surface of the positioning contact portion 3052.

Further, as shown in FIG. 13B, the condenser lens 38 has a protrusion 38A that abuts on the substrate 60 and an insertion hole 64 of the substrate 60 on the A2 side in the A direction in relation to the assembly of the substrate 60 and the heat radiating member 7. It has a positioning protrusion 38B that fits into a positioning hole 70B (see FIG. 4) of the base 70 of the heat radiating member 7 through (see FIG. 4). The protrusions 38A are provided at each of the four corners, and one positioning protrusion 38B is provided on each side in the B direction.

Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

1 Head-up display 2 Case 3 TFT panel unit 3A TFT panel 4 Reflector unit 41 Planar mirror 5 Concave mirror 6 Backlight unit 60 Substrate 60A LED
61 Positioning hole 62 Fastening hole 64 Insertion hole 67 Assembly 7 Heat dissipation member 70 Base 70A Board mounting area 70B Positioning hole 71 Fin 72 Mounting leg

72A Positioning hole

72B Fastening hole 20 Opening forming part 20A Opening 22 Fastening part 22A Positioning pin 22B Boss 23 Fastening 23A Positioning pin 23B Boss 30 Light box 32 Diffusing plate 34 Wrenchular lens 34A Flat surface 34B Ear 36 Wrenchular lens 36A Flat surface 36B Ear 36C Engagement 38 Condenser lens 38A Protrusion 38B Positioning protrusion 39 Display shield 39A Leg 90 Fastener 92 Z-type terminal 94 Connector 201 Basic surface 300A Buffer material 301 Main body 301A Recessed 302 Fastening part

302A Positioning protrusion

302B Fastening hole 303 Mounting leg 304 Mounting part 344 Protrusion part 382 Contacted part 702 Protrusion 703 Peripheral groove 3031 Fastening part

3031A Positioning hole

3031B Fastening hole 3032 Diffusion plate mounting surface 3041 Positioning groove

3041A Positioning hole

3041B Fastening hole 3042 Projection 3051 Fixing hook 3052 Positioning contact part 30321 Claw part 30323 Positioning part

Claims

Housing (2) and
A heat radiating member (7) having a flat substrate mounting area (70A),
A substrate (60) on which a light source (60A) is mounted and mounted in the substrate mounting area, and a substrate (60).
One or more lens members (34, 36, 38) facing the substrate in the direction perpendicular to the substrate, which is the direction perpendicular to the substrate mounting region, and transmitting the light emitted from the light source.
A holding member (30) fixed to the housing and the heat radiating member and holding the one or more lens members is provided.
The heat radiating member has a plurality of first mounting legs (72) outside the board mounting area when viewed in the vertical direction of the board.
Each of the plurality of first mounting legs extends so as to overlap the holding member when viewed in a direction orthogonal to the substrate vertical direction.
The holding member is a head-up display (1) having a plurality of first fastening portions (302) fastened to the end faces of the plurality of first mounting legs.
The holding member has a tubular main body (301) that forms an internal space in which the one or more lens members are arranged.
The plurality of first fastening portions are arranged on the side opposite to the internal space side of the main body portion.
The head-up display according to claim 1, wherein the plurality of first mounting legs are adjacent to a surface of the main body portion opposite to the internal space side.
The holding member further has a second mounting leg portion (303) extending in a direction away from the heat radiating member on the side opposite to the internal space side of the main body portion.
The head-up display according to claim 2, wherein the housing has a second fastening portion (22) that is fastened to an end surface of the second mounting leg portion.
The holding member further has a mounting portion (304) on the side opposite to the internal space side of the main body portion.
The housing has a third fastening portion (23) that is fastened to the end face of the mounting portion.
The head-up display according to claim 3, wherein the second fastening portion has a longer distance in the vertical direction of the substrate from a plane including the substrate mounting area than the third fastening portion.
The end faces of the plurality of first mounting legs extend in the first plane, and the end faces of the second mounting legs and the end faces of the mounting portions are inclined with respect to the first plane. The head-up display according to claim 4, which extends in two planes.
The heat radiating member further
In the substrate mounting area, a protrusion (702) for positioning the substrate and
The head-up display according to any one of claims 1 to 5, which has a peripheral groove (703) recessed around the protrusion in a direction perpendicular to the substrate and away from the substrate.
The head-up display according to any one of claims 1 to 6, wherein the heat radiating member abuts on the substrate along the surface in the substrate mounting area.
The plurality of first mounting legs are located at positions of the one or more lens members that are closer to the substrate in the vertical direction of the substrate than the lens member (38) that is closest to the substrate in the vertical direction of the substrate. The head-up display according to any one of claims 1 to 7, further comprising the end face.