JPWO2020111033A1 - Display forming device - Google Patents

Abstract

In a configuration in which a heat dissipation part such as a heat sink is formed as a part of a case, the heat of the light source is transferred to the heat dissipation part by assembling with good workability. A substrate including a housing including a heat radiating portion, a substrate on which a light source is mounted, a lens member through which light radiated from the light source is transmitted, and a holding member fixed to the housing by a fastening member to hold the lens member. Is provided so that a force in the first direction is transmitted to and from the holding member, the housing has a first mounting portion, and the first mounting portion has a first direction and a fastening direction of the fastening member. The surface of the holding member is inclined toward the forward side in the fastening direction as it is closer to the heat radiation portion in the first direction when viewed in the second direction intersecting with the holding member, and the holding member has a surface along the surface of the first mounting portion. Disclosed is a display forming apparatus that has a mounting portion and the holding member is fastened to the first mounting portion via a fastening member that passes through a hole or notch formed in the second mounting portion.

Description

The present disclosure relates to a display forming apparatus.

A lighting device for a display forming device in which a substrate on which a light source is mounted is thermally connected to a heat sink via a heat conductive sheet is known.

JP-A-2017-126468

In the conventional technique as described above, since the heat sink forms a part of the lighting device and is separate from the case in which the lighting device is housed, the subassembly in which the substrate on which the light source is mounted is fastened to the heat sink. Can be easily formed.

However, in a configuration in which a heat radiating portion such as a heat sink is formed as a part of the case, the substrate on which the light source is mounted is fastened from the inside to the outside toward the inner surface of the case, so that workability is not good.

Therefore, on one aspect, in the display forming apparatus of the present disclosure, in a configuration in which a heat radiating portion such as a heat sink is formed as a part of a case, the heat of the light source is transferred to the heat radiating portion by assembling with good workability. The purpose is to do so.

On one side, the housing including the heat dissipation part and
The board on which the light source is mounted and
A lens member through which the light emitted from the light source is transmitted, and
It is provided with a holding member that is fixed to the housing by a fastening member and holds the lens member.
The substrate is provided in such a relationship that a force in the first direction is transmitted to the holding member.
The housing has a first mounting portion and has a first mounting portion.
The first mounting portion is viewed in a second direction that intersects the first direction and intersects the fastening direction of the fastening member, and the closer to the heat radiation portion in the first direction, the more toward the forward side in the fastening direction. The surface is inclined in the aspect,
The holding member has a second mounting portion having a surface along the surface of the first mounting portion.
A display forming device is provided in which the holding member is fastened to the first mounting portion via the fastening member that passes through a hole or a notch formed in the second mounting portion.

On one side, according to the present disclosure, in a configuration in which a heat radiating portion such as a heat sink is formed as part of a case, the heat of the light source is transferred to the heat radiating portion by assembling with good workability. Is possible.

It is a perspective view which shows the internal structure of the display forming apparatus by one Example from the upper side. It is a figure which shows roughly the vehicle-mounted state of the display forming apparatus in the vehicle side view. It is a perspective view of the TFT panel unit in a single item state. It is an exploded perspective view of the TFT panel unit. It is a perspective view of the backlight unit in a single item state. It is an exploded perspective view of the backlight unit. It is a top view which shows the state which the backlight unit is assembled to a case. It is sectional drawing which follows the line AA of FIG. It is a schematic cross-sectional view along the line BB of FIG. It is explanatory drawing of the force generated by screw tightening. It is a perspective view for demonstrating the method of assembling the backlight unit to a case. It is explanatory drawing of the structure of the back side (negative side in the Y direction) of the backlight unit. It is a cross-sectional perspective view of a part when cut in the XY plane including the line CC of FIG. It is a perspective view of the 2nd lens spring in a single item state. It is explanatory drawing of the assembling method of a substrate. It is explanatory drawing of the assembling method of a heat transfer sheet.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. In addition, in FIG. 1A and the like, for the sake of easy viewing, there are cases where a reference reference numeral is only partially attached to a plurality of parts having the same attribute.

[Configuration of display forming device]
FIG. 1A is a perspective view showing the internal configuration of the display forming apparatus 1 according to the embodiment from above. FIG. 1B is a diagram schematically showing a vehicle mounting state of the display forming device 1 when viewed from the side of the vehicle. Note that, in FIG. 1A, the illustration of some components of the display forming apparatus 1 is omitted. In FIG. 1A, the X direction (an example of the second direction), the Y direction (an example of the first 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 display forming device 1 is for a head-up display and is mounted in the instrument panel 9 of the vehicle. The display forming device 1 may be mounted in a direction in which the Y direction of FIG. 1A substantially corresponds to the vehicle width direction.

The display forming apparatus 1 includes a case 2, a TFT (Thin Film Transistor) panel unit 3 (an example of an image forming unit), mirrors 4 and 5, and a backlight unit 6.

The case 2 forms the housing of the display forming apparatus 1. The case 2 is a lower case that forms the lower part of the housing of the display forming apparatus 1. The case 2 is combined with an upper case (not shown in FIG. 1A).

The case 2 is made of a material having high heat conductivity such as aluminum. Case 2 includes a heat radiating portion 21 as shown in FIG. 1A. The heat radiating portion 21 is formed on the outer surface of the case 2 (the surface exposed to the outside). The heat radiating portion 21 has a function of radiating heat generated from the backlight unit 6. The heat radiating portion 21 releases heat to the air flowing outside the case 2.

The heat radiating portion 21 is formed integrally with the case 2. For example, the heat radiating portion 21 may be formed by casting together with the case 2. However, the heat radiating portion 21 may be formed separately from the case 2 and integrated with the case 2.

The heat radiating portion 21 is in the form of fins. The form of the fin is arbitrary and may be a columnar form or a straight fin form as shown in FIG. 1A. In FIG. 1A, the heat radiating portion 21 is formed in such a manner that straight fins extending in the vertical direction are arranged in the X direction.

The TFT panel unit 3 is a display device that uses the light from the backlight unit 6 as a backlight to emit image light according to the display image. The display image is arbitrary, and may be, for example, an image representing navigation information, various vehicle information, and the like.

The TFT panel unit 3 is fixed to the case 2. For example, as shown in FIG. 1A, the TFT panel unit 3 is fastened with screws 90 at two locations on both sides in the X direction.

FIG. 2 is a perspective view of the TFT panel unit 3 in a single item state, and FIG. 3 is an exploded perspective view of the TFT panel unit 3.

The TFT panel unit 3 includes a TFT holder 31, a TFT panel 32, a diffusion sheet 33, and a TFT cover 34. The TFT holder 31 is fixed to the case 2 as described above. The TFT holder 31 holds the TFT panel 32. The TFT panel 32 is a dot matrix type TFT (Thin Film Transistor) panel or the like. The TFT panel 32 is provided so that the long side direction corresponds to the X direction. The TFT cover 34 is fitted and coupled to the TFT holder 31. The TFT panel 32 and the diffusion sheet 33 are held between the TFT cover 34 and the TFT holder 31 in the Y direction.

The mirrors 4 and 5 reflect the image light emitted from the TFT panel unit 3 and emit the image light from the outlet provided in the upper case (not shown), and the windshield glass WS of the vehicle VC (FIG. (See 1B). In this embodiment, two mirrors 4 and 5 are provided, but the number of mirrors is arbitrary. In this embodiment, as an example, the mirror 4 is a flat mirror and the mirror 5 is a concave mirror. The mirror 5 may be rotatably supported with respect to the case 2 so that the vertical position of the area exposed to the image light on the windshield glass WS can be adjusted.

When the windshield glass WS is irradiated with the image light, as shown in FIG. 1B, for the driver driving the vehicle VC, the display image obtained by the irradiation is displayed in front of the windshield glass WS. 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.

The backlight unit 6 is provided behind the TFT panel unit 3 (on the negative side in the Y direction). The backlight unit 6 cooperates with the TFT panel unit 3 to generate image light. The backlight unit 6 is fixed to the case 2.

FIG. 4 is a perspective view of the backlight unit 6 in a single item state, and FIG. 5 is an exploded perspective view of the backlight unit 6.

The backlight unit 6 has a function of emitting light from the light source 8 to the TFT panel unit 3 and transferring the heat generated by the light source 8 to the heat radiating portion 21.

The backlight unit 6 includes a lens cover 61, a first lens spring 62, a condenser lens 63, a diffuser plate 64, a lens holder 65 (an example of a holding member), and a second lens spring 66 (a leaf spring member). An example), a lens array 67 (an example of a lens member), a substrate 68, and a heat transfer sheet 69.

The lens cover 61 covers the front surface (positive side in the Y direction) of the backlight unit 6. The lens cover 61 has an opening 611 from which the condenser lens 63 is exposed. The lens cover 61 is fitted and coupled to the lens holder 65. In this embodiment, as an example, the lens cover 61 has claws 612 extending in the negative direction in the Y direction at four corners, and is fitted and coupled to the lens holder 65 by the claws 612.

The first lens spring 62 is in the form of a leaf spring and is provided between the lens cover 61 and the condenser lens 63 in the Y direction. The first lens springs 62 are provided in pairs in the vertical direction. Each of the first lens springs 62 is fixed to the upper side and the lower side side surfaces of the lens cover 61. Each of the first lens springs 62 urges the condenser lens 63 together with the diffuser plate 64 toward the lens holder 65. As described above, the first lens spring 62 has a function of defining the positions of the condenser lens 63 and the diffuser plate 64 in the Y direction with respect to the lens holder 65.

The diffuser plate 64 and the condensing lens 63 diffuse and condense the light from the light source 8 that is incident through the lens array 67 toward the front surface (positive side in the Y direction) of the backlight unit 6. It has a function to emit light. The diffusion plate 64 is, for example, a plate shape formed of a translucent resin material and having at least one surface subjected to fine unevenness processing.

The diffuser plate 64 and the condenser lens 63 are held on the positive side of the lens holder 65 in the Y direction. For example, the diffuser plate 64 and the condenser lens 63 each have through holes 641 and 631 through which the pin portion 650 of the lens holder 65 passes, and the positions in the Z direction and the X direction with respect to the lens holder 65 are defined.

The lens holder 65 holds the diffuser plate 64 and the condenser lens 63, and also holds the lens array 67. The lens holder 65 is fixed to the case 2. The backlight unit 6 is fixed to the case 2 by fixing the lens holder 65 to the case 2. A preferred example of a method for fixing the backlight unit 6 (lens holder 65) to the case 2 will be described later.

The second lens spring 66 is in the form of a leaf spring and is fixed to the lens holder 65. The second lens spring 66 has a function of urging the lens array 67 toward the substrate 68. Further, in the present embodiment, the second lens spring 66 further has a function of urging the heat conductive sheet 69 toward the substrate 68 (hereinafter, also referred to as “heat conductive sheet holding function”). The details of the configuration of the second lens spring 66 and the details of the heat transfer sheet holding function by the second lens spring 66 will be described later.

The lens array 67 is formed of a translucent resin material and is arranged so as to cover the positive side of the substrate 68 in the Y direction. The lens array 67 includes a collimator portion 671 having a conical convex outer peripheral surface obtained by rotating a substantially parabolic disconnection. The lens array 67 is located so as to face the light source 8 mounted on the substrate 68, and transmits the light emitted from the light source 8 to the positive side in the Y direction. The outer shape of the lens array 67 is a rectangle (a rectangle whose long side is in the X direction) that is substantially the same as the outer shape of the TFT panel unit 3 (and the TFT panel 32).

The substrate 68 is provided behind the lens array 67 (on the negative side in the Y direction). The light source 8 is mounted on the surface of the substrate 68 on the side facing the lens array 67. The light source 8 is an LED (Light Emitting Diode). The arrangement method and number of the light sources 8 are arbitrary. The light source 8 is provided so that the direction of the optical axis is perpendicular to the substrate 68. In this embodiment, the optical axis direction is the Y direction. The substrate 68 may be a glass epoxy substrate, a glass composite substrate, or the like. The substrate 68 may be positioned by the lens array 67 by being positioned by the lens holder 65.

The heat conductive sheet 69 is a sheet-like member having heat conductive properties. The heat transferable sheet 69 may be formed of a thermal sheet, TIM (Thermal Interface Material) or the like. The heat transferable sheet 69 may have a characteristic that the thermal resistance decreases as the pressure in the thickness direction increases. It should be noted that this characteristic may be linear or non-linear.

The heat conductive sheet 69 is sandwiched between the case 2 and the substrate 68 in the Y direction. In particular, the heat transfer sheet 69 is sandwiched on the case 2 side in such a manner that it abuts on the surface 2a (FIG. 10) of the case 2.

The heat conductive sheet 69 does not have adhesiveness on the surface. That is, the heat transferable sheet 69 does not have an adhesive layer on its surface. Therefore, the heat transferable sheet 69 comes into contact (surface contact) in a manner that does not adhere to the other member (in this embodiment, the substrate 68 and the case 2) that comes into surface contact. In general, the heat transferable sheet 69 having no adhesive layer is cheaper than the heat transferable sheet having an adhesive layer.

[How to fix the backlight unit (lens holder) to the case]
Next, a preferable example of the method of fixing the backlight unit 6 (lens holder 65) to the case 2 and the heat dissipation principle of the backlight unit 6 according to the present embodiment will be described with reference to FIGS. 6 to 10.

FIG. 6 is a top view showing a state in which the backlight unit 6 is assembled to the case 2, FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6, and FIG. 8 is a line of FIG. It is a schematic cross-sectional view along BB. FIG. 9 is an explanatory diagram of the force generated by tightening the screws. FIG. 10 is a perspective view for explaining a method of assembling the backlight unit 6 to the case 2.

As shown in FIG. 10, the backlight unit 6 is provided in a manner adjacent to the heat radiating portion 21 of the case 2 in the Y direction. In this embodiment, as an example, in the case 2, the surface 2a on the positive side in the Y direction of the heat radiating portion 21 projects to the positive side in the Y direction. The surface 2a of the heat radiating portion 21 is a surface on which the heat transfer sheet 69 comes into surface contact. Further, in this embodiment, as an example, the case 2 has recesses 2b on both sides of the heat radiating portion 21 in the X direction. The recess 2b receives the second urging portion 663 of the second lens spring 66, which will be described later.

As shown in FIG. 10, the backlight unit 6 is fixed to the case 2 at two points by screws 94 (an example of a fastening member). The screw 94 is tightened in the vertical direction (fastening direction) so as to proceed downward from the opening covered by the upper case toward the bottom surface of the case 2. In this case, it is easier to secure a work area and the workability of tightening the screw 94 is significantly improved as compared with the case where the tightening is performed in the direction in the XY plane.

Specifically, the case 2 has first screw receiving portions 70 (an example of the first mounting portion) on both sides of the mounting space of the backlight unit 6 in the X direction, and the lens holder 65 of the backlight unit 6 has a lens holder 65. The first screw fastening portion 651 (an example of the second mounting portion) is provided on both sides in the X direction, and the first screw fastening portion 651 is fastened to the first screw receiving portion 70 by the screws 94.

The first screw fastening portion 651 has a seat portion 6511 that receives the lower surface of the head portion of the screw 94. The seat portion 6511 includes a notch 6512 that is open on the positive side in the Y direction. Therefore, the lens holder 65 can be displaced to the negative side in the Y direction with respect to the screw 94 until it is completely fastened.

As shown in FIG. 8, the first screw receiving portion 70 is viewed in the X direction (the long side direction of the lens array 67), and the downward direction is toward the negative side in the Y direction (= the optical axis direction of the light source 8). The surface 72 is inclined (in a mode close to the heat radiation portion 21). That is, the upper surface of the first screw receiving portion 70 is inclined downward when viewed from the positive side in the Y direction. The inclination angle is arbitrary, but is, for example, about 45 degrees.

As shown in FIG. 8, the first screw fastening portion 651 has a lower surface 6513 along the surface 72 of the first screw receiving portion 70. Therefore, the lower surface 6513 is inclined downward when viewed from the positive side in the Y direction. Therefore, the first screw fastening portion 651 can be displaced along the surface with respect to the first screw receiving portion 70 until the lens holder 65 is completely fastened to the case 2 by the screw 94.

Therefore, as schematically shown in FIG. 9, when fastened by the screw 94, the force F1 due to the screw tightening is a component (component) Fy in the Y direction facing the negative side and a component (component) Fz downward. It occurs in a mode including. At this time, the component force Fy acts to displace the lens holder 65 on the negative side in the Y direction with respect to the case 2. That is, when the tightening torque becomes relatively large during screw tightening, the lens holder 65 is displaced diagonally downward and negatively in the Y direction with respect to the case 2.

In this way, in this embodiment, when the lens holder 65 is fastened to the case 2 with the screw 94, the lens holder 65 can be displaced slightly to the negative side in the Y direction with respect to the case 2. The displacement of the lens holder 65 to the negative side in the Y direction with respect to the case 2 at the time of such fastening functions to appropriately compress the heat conductive sheet 69 between the substrate 68 and the heat radiating portion 21 of the case 2.

In this embodiment, the substrate 68 is provided in such a manner that a force in the Y direction is transmitted to and from the lens holder 65. Specifically, as shown in FIG. 7, the lens holder 65 has a portion 654 that abuts on the substrate 68 in the Y direction (hereinafter, also referred to as “contact portion 654”). In this case, the substrate 68 has a relationship in which the force in the Y direction is transmitted to and from the lens holder 65 via the contact portion 654. In addition, a plurality of contact portions 654 may be provided on the substrate 68 so that the heat conductive sheet 69 is evenly compressed in the plane. As a result, when the lens holder 65 is displaced to the negative side in the Y direction, the gap in the Y direction (that is, the thickness of the heat transfer sheet 69) between the substrate 68 and the heat radiating portion 21 of the case 2 is reduced. In the modified example, the lens holder 65 may not have the contact portion 654, and the lens array 67 may have the same contact portion 654. In this case as well, the substrate 68 is in a relationship in which the force in the Y direction is transmitted to and from the lens holder 65 via the lens array 67 and the second lens spring 66. Therefore, also in this case, when the lens holder 65 is displaced to the negative side in the Y direction, the gap in the Y direction between the substrate 68 and the heat radiating portion 21 of the case 2 via the lens array 67 (that is, the thickness of the heat transfer sheet 69). Is reduced.

Here, as shown in FIG. 7, a heat transfer sheet 69 is interposed between the substrate 68 and the heat radiating portion 21 of the case 2. Therefore, the heat of the substrate 68 (heat generated by the light source 8) is transferred to the heat radiating portion 21 via the heat transmitting sheet 69 and released to the outside. In order to properly establish such a heat transfer path, it is useful that the heat transfer sheet 69 is in surface contact with both the substrate 68 and the heat radiation portion 21 of the case 2 over the entire surface. Is usefully compressed in the Y direction toward the side surface of the case 2 (the side surface on the surface 2a side).

Then, in this embodiment, as described above, when the lens holder 65 is fastened to the case 2 with the screw 94, the lens holder 65 is slightly displaced to the negative side in the Y direction with respect to the case 2. The gap in the Y direction (that is, the thickness of the heat transfer sheet 69) between the substrate 68 and the heat radiating portion 21 of the case 2 can be reduced by the amount of reduction according to the displacement. Thereby, the heat conductive sheet 69 between the substrate 68 and the heat radiating portion 21 of the case 2 can be appropriately compressed.

In this way, in this embodiment, when the lens holder 65 is fastened to the case 2 with the screw 94, even when the screw 94 is fastened in the downward direction, the substrate 68 and the heat radiating portion 21 of the case 2 are fastened. The heat transferable sheet 69 between can be appropriately compressed. That is, when the lens holder 65 is fastened to the case 2 with screws, the heat transfer sheet between the substrate 68 and the heat radiating portion 21 of the case 2 does not have to be tightened in the direction in which the screws go in the negative direction in the Y direction. 69 can be appropriately compressed. As a result, in this embodiment, when the lens holder 65 is fastened to the case 2, the screw tightening in the negative direction in the Y direction can be eliminated, so that the number of screws can be reduced and the work at the time of fastening can be reduced. You can improve your sex. Regarding workability, when the screw is tightened in the negative direction in the Y direction, the workability is not good from the viewpoint of the work space. When the screw 94 is fastened in the downward direction, the workability is good because the space above the lens holder 65 is an open space.

By the way, if the tightening amount of the screw 94 is excessive, the gap in the Y direction between the substrate 68 and the heat radiating portion 21 of the case 2 (that is, the thickness of the heat transfer sheet 69) may be excessively reduced. It is desirable to provide a stopper mechanism that mechanically prevents such excessive tightening.

Such a stopper mechanism is arbitrary as long as it can regulate an excessive displacement (displacement exceeding the upper limit value) of the lens holder 65 in the negative direction in the Y direction with respect to the case 2.

In this embodiment, as an example, the case 2 has second screw receiving portions 74 on both sides of the mounting space of the backlight unit 6 in the X direction, and the lens holder 65 of the backlight unit 6 is located in the center of the X direction. It has a screw passing portion 652 on the upper side and on the negative side in the Y direction. The screw passing portion 652 is formed at a position corresponding to the second screw receiving portion 74. A screw hole for receiving the screw 95 is formed in the first screw receiving portion 70 and the second screw receiving portion 74. The screw passing portion 652 is in the form of a notch that opens on the negative side in the Y direction, and the shaft portion of the screw 95 can pass through. The positional relationship between the screw passing portion 652 and the second screw receiving portion 74 in the Y direction is adapted so that the above-mentioned stopper mechanism functions properly. Specifically, when the tightening amount of the screw 94 increases and the lens holder 65 is displaced to the negative side in the Y direction with respect to the case 2, the screw passing portion 652 of the lens holder 65 is Y with respect to the shaft portion of the screw 95. Contact in the direction. When the screw passing portion 652 of the lens holder 65 abuts on the shaft portion of the screw 95 in the Y direction, the lens holder 65 is unlikely to be displaced to the negative side in the Y direction with respect to the case 2, so that the stopper mechanism is at this position. Will work.

In the modified example, a stopper mechanism may be provided separately, and the lens holder 65 may be fastened to the case 2 at a location corresponding to the second screw receiving portion 74. Even in this case, although the number of screws as the fastening member is three, the screw tightening in the negative direction in the Y direction can be eliminated, so that the workability at the time of fastening can be improved.

Further, in another modification, as another stopper mechanism, the above-mentioned contact portion 654, a positioning protrusion that may be provided on the back surface (the surface on the negative side in the Y direction) of the lens holder 65, or the like is a stopper mechanism. May function as.

[Details of the configuration of the second lens spring and the heat transfer seat holding function]
Next, the configuration of the second lens spring 66 and the details of the heat transfer sheet holding function by the second lens spring 66 will be described.

FIG. 11 is an explanatory view of the configuration of the back surface side (negative side in the Y direction) of the backlight unit 6, and is a perspective view showing a part of the display forming apparatus 1 excluding the case 2. FIG. 12 is a partial cross-sectional perspective view when cut in the XY plane including the lines CC of FIG. FIG. 13 is a perspective view of the second lens spring 66 in a single item state. FIG. 14 is an explanatory view of an assembling method of the substrate 68, and FIG. 15 is an explanatory view of an assembling method of the heat conductive sheet 69. 14 and 15 show the substrate 68 very schematically for illustration purposes.

As described above, the second lens spring 66 has a function of urging the lens array 67 toward the substrate 68 and a function of holding a heat-conducting sheet. As shown in FIG. 11, the second lens spring 66 is provided on both side portions 658 of the lens holder 65 in the X direction, respectively. That is, the second lens springs 66 are located on both sides of the lens holder 65 in the X direction and form a pair. The second lens springs 66 on both sides in the X direction are symmetrical in the X direction. In the following, unless otherwise specified, one of the second lens springs 66 will be described.

As shown in FIG. 13, the second lens spring 66 includes a fixed portion 661, a first urging portion 662 (an example of a first portion), a second urging portion 663 (an example of a second portion), and a protrusion. Includes part 664 and.

The fixing portion 661 is a portion fixed to the lens holder 65. The fixing portion 661 has a pair of holding portions 6611 that sandwich the side portion 658 of the lens holder 65, and a fitting portion 6612 that fits into the convex portion 6581 of the side portion 658 of the lens holder 65.

The first urging unit 662 urges the lens array 67 toward the substrate 68. The first urging portion 662 is formed in a manner continuous with the fixed portion 661. The first urging portion 662 extends in the X direction and is elastically deformed by receiving a force from the lens array 67 toward the positive side in the Y direction. The first urging portion 662 is provided at two upper and lower positions centered on the center in the vertical direction on the side portion 658 of the lens holder 65. In this case, the first urging unit 662 can urge the lens array 67 toward the substrate 68 substantially evenly in the vertical direction. This is because the vertical center of the lens holder 65 and the vertical center of the lens array 67 substantially coincide with each other.

The second urging unit 663 realizes the heat transmitting sheet holding function by urging the heat transmitting sheet 69 toward the substrate 68. The second urging portion 663 is formed in a manner continuous with the fixed portion 661. The second urging portion 663 is bent at a position farther from the lens array 67 than the heat transfer sheet 69 in the Y direction (hereinafter, also referred to as “bending position”, see P1 in FIG. 12) (an example of the first position). Then, it extends toward a position where it comes into contact with the heat transfer sheet 69 (hereinafter, also referred to as "contact position", see P2 in FIG. 12) (an example of the second position). Therefore, the second urging portion 663 includes a portion extending on the negative side in the Y direction with respect to the heat conductive sheet 69, and a part of the portion is located in the recess 2b (see FIG. 10) of the case 2.

The second urging portion 663 has an inclined surface 6632. As shown in FIG. 12, the inclined surface 6632 is formed between the bending position (see P1 in FIG. 12) and the contact position (see P2 in FIG. 12). When viewed in the Z direction (vertical direction), the inclined surface 6632 is closer to the center of the lens array 67 in the X direction at the contact position (see P2 in FIG. 12) than at the bending position (see P1 in FIG. 12). Inclination in the embodiment. As shown in FIG. 12, the inclined surface 6632 may be formed over the entire area between the bending position (see P1 in FIG. 12) and the contact position (see P2 in FIG. 12). However, in the modified example, the inclined surface 6632 may be formed only in a part between the bending position (see P1 in FIG. 12) and the contact position (see P2 in FIG. 12). Having such an inclined surface 6632 facilitates the assembly of the substrate 68.

Specifically, after assembling the second lens spring 66 or the like to the lens holder 65, as shown by the arrow R1 in FIG. 14, when the substrate 68 is attached in the Y direction from the negative side in the Y direction, the substrate 68 has an inclined surface 6632. It is possible to proceed to the positive side in the Y direction along the inclined surface 6632. That is, the second lens spring 66 can be elastically deformed in a manner in which the substrate 68 is attracted to the positive side in the Y direction. At this time, the second urging portion 663 is elastically deformed in the direction in which the bending angle is narrowed (see arrow R2 in FIG. 14), and the substrate 68 can be further advanced (assembled) in the positive direction in the Y direction. Finally, the substrate 68 reaches the positive side in the Y direction with respect to the second urging portion 663, and the second urging portion 663 is restored in such a manner that the bending angle returns to the original. However, even in this state (the state in which the assembly of the substrate 68 is completed), the second urging portion 663 is in a state in which the substrate 68 is urged toward the lens array 67. Alternatively, in the state where the assembly of the substrate 68 is completed (the state before the assembly of the heat transfer sheet 69), the second urging unit 663 contacts the substrate 68 without urging the substrate 68 toward the lens array 67. It may be in a state of just being.

The protrusion 664 is formed on the surface of the second urging portion 663 on the negative side in the Y direction (the side far from the lens array 67). The protrusion 664 is formed in a manner continuous with the second urging portion 663.

The protrusion 664 has a function of improving the assembling property when assembling the heat conductive sheet 69 on the substrate 68. Specifically, the heat conductive sheet 69 is assembled after the substrate 68 is assembled to the lens holder 65 as described above, and the second urging portion 663 places the heat conductive sheet 69 on the substrate 68. It extends in a manner that overlaps the surface. Therefore, the second urging portion 663 becomes an obstacle when assembling the heat conductive sheet 69. In other words, in order to assemble the heat transfer sheet 69 on the substrate 68, the second biasing portion 663 is temporarily elastically deformed to the negative side in the Y direction (see the dotted line in FIG. 15), and the substrate 68 and the second attachment are attached. It is necessary to form a gap Δ1 (see FIG. 15) into which the heat conductive sheet 69 enters with the force portion 663.

At this point, when the protrusion 664 is provided, as shown by the arrow R3 in FIG. 15, a force is applied to the protrusion 664 to temporarily elastically deform the second urging portion 663 to the negative side in the Y direction. As a result, even when the second lens spring 66 has the second urging portion 663 for the heat transmitting sheet holding function, the heat transmitting sheet 69 can be easily assembled.

The protrusion 664 is preferably inclined in the same direction as the inclined surface 6632 of the second urging portion 663 when viewed in the Z direction. That is, the protrusion 664 has an embodiment in which the root position (see P3 in FIG. 13) on the second urging portion 663 side is closer to the center of the lens array 67 in the X direction than the tip position (see P4 in FIG. 13). It slopes and extends. In this case, a force is applied to the protrusion 664 to temporarily elastically deform the second urging portion 663 to the negative side in the Y direction.

In this way, in this embodiment, the backlight unit 6 in the assembled state in which the heat conductive sheet 69 is held by the second lens spring 66 can be configured. As a result, it is not necessary to add an adhesive layer to the heat transferable sheet 69, and the cost of the heat transferable sheet 69 can be reduced.

More specifically, in the configuration in which the heat radiating portion 21 is formed as a part of the case 2 as in the present embodiment, the heat radiating portion 21 of the case 2 and the substrate 68 are formed before the backlight unit 6 is assembled to the case 2. The heat transfer sheet 69 cannot be held between the and the heat transfer sheet 69. In this respect, unlike the second lens spring 66 of the present embodiment, even if the second urging portion 663 is not provided, if the heat conductive sheet 69 is provided with adhesiveness, the heat radiating portion 21 or the substrate is provided. It is also possible to assemble the backlight unit 6 to the case 2 with the heat conductive sheet 69 attached to the 68. However, using the heat conductive sheet 69 having such adhesiveness is disadvantageous from the viewpoint of cost and the like.

In this regard, according to the present embodiment, as described above, since the second lens spring 66 includes the second urging portion 663, the backlight unit in the assembled state in which the heat transfer sheet 69 is held by the second lens spring 66. 6 can be assembled to the case 2. That is, the heat transferable sheet 69 can be appropriately assembled without imparting adhesiveness to the heat transferable sheet 69. As a result, the cost of the heat transferable sheet 69 can be reduced.

Although each embodiment has been described in detail above, the present invention 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.

For example, in the above-described embodiment, the lens holder 65 has a notch 6512 in the first screw fastening portion 651 so that the lens holder 65 can be displaced to the positive side in the Y direction with respect to the case 2. An elongated hole having a longitudinal direction may be formed.

Further, in the above-described embodiment, the heat transfer sheet 69 is provided between the substrate 68 and the heat radiating portion 21, but the heat transfer sheet 69 may be omitted. In this case, the lens holder 65 may be fixed to the case 2 so that the substrate 68 comes into direct contact with the heat radiating portion 21 (the surface 2a of the case 2). In this case, the method of fixing the lens holder 65 to the case 2 may be the same as that of the above-described embodiment.

1 Display forming device 2 Case 2a Surface 2b Recess 3 TFT panel unit 4 Mirror 5 Mirror 6 Backlight unit 8 Light source 9 Instrument panel 21 Heat dissipation part 31 TFT holder 32 TFT panel 33 Diffusion sheet 34 Cover 61 Lens cover 62 First lens spring 63 Condensing lens 64 Diffusing plate 65 Lens holder 66 Second lens spring 67 Lens array 68 Substrate 69 Heat transfer sheet 70 First screw receiving part 72 Surface 74 Second screw receiving part 90 Screw 94 Screw 95 Screw 611 Opening 612 Claw 631 Through hole 641 Through hole 650 Pin part 651 First screw fastening part 652 Screw passing part 654 Contact part 658 Side part 661 Fixing part 662 First urging part 663 Second urging part 664 Protrusion part 671 Collimator part 6511 Seat part 6512 Notch 6513 Bottom surface 6581 Convex part 6611 Holding part 6612 Fitting part 6632 Inclined surface

Claims (5)

The housing including the heat dissipation part and
The board on which the light source is mounted and
A lens member through which the light emitted from the light source is transmitted, and
It is provided with a holding member that is fixed to the housing by a fastening member and holds the lens member.
The substrate is provided in such a relationship that a force in the first direction is transmitted to the holding member.
The housing has a first mounting portion and has a first mounting portion.
The first mounting portion is viewed in a second direction that intersects the first direction and intersects the fastening direction of the fastening member, and the closer to the heat radiation portion in the first direction, the more toward the forward side in the fastening direction. The surface is inclined in the aspect,
The holding member has a second mounting portion having a surface along the surface of the first mounting portion.
A display forming device in which the holding member is fastened to the first mounting portion via the fastening member that passes through a hole or a notch formed in the second mounting portion. The display forming apparatus according to claim 1, wherein two sets of the first mounting portion and the second mounting portion are provided. A leaf spring member fixed to the holding member and urging the lens member toward the substrate is further provided.
The display forming apparatus according to claim 1 or 2, wherein the leaf spring member has a first portion that urges the lens member toward the substrate. Further provided with a heat-conducting sheet sandwiched between the heat-dissipating portion and the substrate in the first direction.
The display forming apparatus according to claim 3, wherein the leaf spring member further includes a second portion for urging the heat transfer sheet toward the substrate. For head-up displays,
The display forming apparatus according to any one of claims 1 to 4, further comprising an image forming unit fixed to the housing and forming an image using light from the display forming apparatus.

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