JP2009109798A - Headup display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headup display device having little possibility that backlash of a reflection member occurs. <P>SOLUTION: The headup display device is equipped with a liquid crystal display element 22 emitting display light L, a cold mirror 31 reflecting the display light L and a case member 32 having a housing wall 33c in which the cold mirror 31 is housed, and projects the display light L reflected by the cold mirror 31 to a windshield 13 so as to display a virtual image. The housing wall 33c is equipped with a pair of opposed walls 60 and 61 provided along a pair of opposed side surface parts P1 and P2 of the cold mirror 31 and opposed to each other while putting the cold mirror 31 in between. One opposed wall 60 out of the pair of opposed walls 60 and 61 has an elastic piece 60a, formed thereon, for pressing the cold mirror 31 to the other opposed wall 61 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a head-up display device that displays a virtual image by projecting display light emitted from a display (display element) onto a projection member such as a windshield using a reflective member.

  Conventionally, in this type of head-up display device, for example, as described in Patent Document 1 below, there is a device that projects a display light from a display onto a windshield (projection member) of a vehicle to display a virtual image. Are known.

Such a head-up display device described in Patent Document 1 is mounted inside an instrument panel (hereinafter referred to as an instrument panel) of a vehicle, and is positioned directly above the display element that emits display light, A cold mirror (reflecting member) that reflects display light emitted from the element to the concave mirror side, a concave mirror for projecting display light reflected by the cold mirror to the projection member side, a display element, a cold mirror, and a concave mirror A housing that houses the display light, and the display light reflected by the cold mirror and the concave mirror is projected onto a projection member through an emission portion (translucent cover) formed on the housing to display a virtual image.
JP 2003-344801 A

  By the way, the cold mirror K has a case member 3 composed of an upper case body (first case body) 1 and a lower case body (second case body) 2 made of, for example, black synthetic resin as shown in FIG. The structure attached in the state sandwiched by each case body 1 and 2 is common. The cold mirror K and the case member 3 constitute a reflector.

  The upper case body 1 has an opening 1a composed of a substantially rectangular window for facing a required portion of a reflection surface (reflection surface for reflecting display light from the display) K1 provided on the cold mirror K. And a substantially frame-shaped frame portion 1b formed so as to cover the peripheral portion of the required portion, and a storage wall (storage portion) 1c for storing the cold mirror K is provided on the back side of the frame portion 1b. It will be. In addition, the opening width of the opening part 1a is narrower than the opening width of the storage wall 1c. The reflection surface K1 of the cold mirror K is formed on a rectangular glass substrate K2.

  In addition, a plurality of engaging portions (not shown) are provided at appropriate locations on the outer peripheral portion of the upper case body 1, and a plurality of engaging portions are provided on the lower case body 2. The upper case body 1 and the lower case body 2 are fitted and fixed (hook fixed). On the other hand, the lower case body 2 includes a cover portion that covers the back side of the cold mirror K, and includes a support portion 2 a that supports the back surface of the cold mirror K.

  When attaching (fixing) the cold mirror K using both the case bodies 1 and 2, first, for example, the cold mirror 31 is stored in the storage wall 33c with the back side of the upper case body 1 facing up. (Accommodates). At this time, the cold mirror K is accommodated so that a required portion of the reflecting surface faces the opening 1a.

  Next, the lower case body 2 is placed on the storage wall 1c (upper case body 1) formed by storing and fixing the cold mirror K so that the support portion 2a contacts the back surface of the cold mirror K and the back surface of the frame portion 1b. Place. At this time, the respective engagement portions provided in the upper case body 1 are respectively engaged with the respective engagement portions provided in the lower case body 2, so that the cold mirror 31 is in the thickness direction thereof. It is fixed between the frame 1b and the support 2a. As described above, the cold mirror K is attached using the case bodies 1 and 2.

  In the case of the head-up display device described above, the cold mirror K is housed and fixed by the case bodies 1 and 2. At this time, the cold mirror K is stored and fixed by the case bodies 1 and 2 so that the side surfaces (four side surfaces) of the cold mirror K abut against the inner wall surface of the storage wall 1c without clearance. Although it is preferable, there is a dimensional tolerance in the dimensions of each part in the cold mirror K, the upper case body 1 and the lower case body 2, and thus the clearance cannot be eliminated.

  That is, in FIG. 6, the inner wall surfaces 1d and 1e of the storage wall 1c, which are side surfaces K3 and K4 of the cold mirror K and a pair of opposed surfaces (opposing walls) facing the side surfaces K3 and K4 with the cold mirror K interposed therebetween. In some cases, a slight clearance S1, S2 may occur between the two. Even if the side surface portion K3 and the inner wall surface 1d are brought into close contact with each other and the minute clearance S1 is eliminated, the minute clearance S2 generated between the side surface portion K4 and the inner wall surface 1e is necessarily generated.

Accordingly, the head-up display including the reflector in which the minute clearance S1 and the minute clearance S2 due to the dimensional tolerance are generated between the side surfaces K3 and K4 and the inner wall surfaces 1d and 1e of the storage wall 1c as described above. When the device is mounted inside the instrument panel of the vehicle, the cold mirror K, which is a reflecting member, may move slightly along the surface direction of the cold mirror K between the inner wall surfaces 1d and 1e due to the vibration of the vehicle, As a result, the cold mirror K may be rattled.
Therefore, the present invention is directed to providing a head-up display device that is less likely to cause backlash of a reflecting member in order to cope with the above-described problems.

  The present invention includes a display element that emits display light, a reflective member that reflects the display light, and a case member that has a storage portion that stores the reflective member, and projects the display light reflected by the reflective member. In the head-up display device that projects onto a member and displays a virtual image, the storage portion is provided along a pair of opposite side surfaces of the reflecting member, and a pair of opposing walls that face each other with the reflecting member interposed therebetween. In addition, an elastic piece for pressing the reflecting member against the other opposing wall is formed on one of the pair of opposing walls.

  ADVANTAGE OF THE INVENTION According to this invention, the initial objective can be achieved and the head-up display apparatus with little possibility that the reflection member will rattle can be provided.

  Hereinafter, an embodiment in which the present invention is applied to a head-up display device for a vehicle will be described with reference to the accompanying drawings. 1 to 5 show an embodiment of the present invention, FIG. 1 is a schematic view of a head-up display device according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view of the head-up display device according to the embodiment. 3 is a cross-sectional view of the first reflector according to the embodiment, FIG. 4 is a rear view of the first case body according to the embodiment, and FIG. 5 is a first view when viewed from the direction of arrow Z in FIG. It is a figure which shows a part of case body.

  As shown in FIG. 1, the head-up display device uses the windshield 13 of the vehicle 10 that is a projection member to emit the display light L that is projected by the display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10. The virtual image V is displayed by reflecting in the direction of the driver (user) 14. In other words, the head-up display device emits (projects) display light L emitted from a liquid crystal display (to be described later) of the display device 12 onto the windshield 13 (the projection member), and a display image ( Virtual image) V is made visible to the user 14. Thereby, the user 14 can observe the virtual image V superimposed on the landscape.

  As shown in FIG. 2, the display device 12 mainly includes a liquid crystal display 20, a first reflector 30, a second reflector 40, and a housing 50.

  The liquid crystal display 20 has a light source 21 formed of a light emitting diode mounted on the wiring board R and a front side (directly above) the light source 21 so as to transmit the illumination light from the light source 21 and form the display light L. It is mainly composed of a TFT-type liquid crystal display element (display element) 22 positioned. This means that the light source 21 is disposed behind (directly below) the liquid crystal display element 22, and the liquid crystal display element 22 displays predetermined information (information to be described later) by the light emitted from the light source 21. I mean. The liquid crystal display 20 is provided in the housing 50 such that the surface on the emission side of the display light L faces a cold mirror (to be described later) of the first reflector 30, and the optical axis of the display light L is on the cold mirror. Fixed and held at a crossing position and orientation.

  Further, the liquid crystal display element 22 emits and displays information (for example, the speed of the vehicle and the engine speed) to be displayed by an element driving circuit (not shown) by numerical values. The liquid crystal display 20 outputs display light L composed of light in the visible wavelength range. For example, a light source 21 that emits red light (mainly emission wavelength range of 610 to 640 nm) can be applied. Needless to say, the information to be displayed is not limited to the speed of the vehicle and the engine speed, and any display form can be adopted.

  The first reflector 30 includes a cold mirror (reflective member) 31 and a case member 32 that is an attachment member for attaching the cold mirror 31.

  The cold mirror 31 includes a substantially rectangular glass substrate 31a and a first reflecting layer (reflecting surface) 31b formed on one surface of the glass substrate 31a (a surface facing a concave mirror described later of the second reflector 40). It will be. The first reflective layer 31b is composed of multilayer interference films having different film thicknesses, and is formed by a method such as vapor deposition. The cold mirror 31 is disposed in an inclined state at a position where the display light L emitted from the liquid crystal display 20 is reflected to the second reflector 40 (the concave mirror) side.

  The cold mirror 31 reflects light in the visible wavelength range (450 to 750 nm) including the emission wavelength range of the liquid crystal display 20 with a high reflectance (for example, 80% or more), and lowers light outside the visible wavelength range. It reflects with reflectivity. In this case, a cold mirror 31 that reflects light in the infrared wavelength region other than the visible wavelength region (infrared rays or heat rays of sunlight) with a low reflectance (for example, 15% or less) is applied. The light that is not reflected by the first reflective layer 31 b is configured to pass through the cold mirror 31.

  In the case of the present embodiment, the cold mirror 31 and the liquid crystal display 20 are arranged at a position where they cannot directly face a translucent cover (to be described later) of the housing 50, and light from outside such as sunlight (external light). Is a structure that does not directly hit.

  The case member 32 is made of, for example, a black synthetic resin material, and includes a first case body 33 and a second case body 34 in the case of the present embodiment. The case member 32 is fixed to the housing 50 by a predetermined fixing means.

  As shown in FIGS. 3 and 4, the outer shape of the first case body 33 is formed in a substantially frame shape, and the first case body 33 has a substantially rectangular shape for facing a required portion of the first reflective layer 31 b in the cold mirror 31. An opening 33a formed of a window portion and a frame portion 33b formed so as to cover the peripheral portion of the required portion are provided, and a storage wall (storage portion) for storing the cold mirror 31 is provided on the back side of the frame portion 33b. 33c is provided. In this case, the opening width of the opening 33a is narrower than the opening width of the storage wall 33c.

  In addition, the storage wall 33c is formed on the pair of first and second side portions (side portions) P1 and P2 opposed to the cold mirror 31 in the longitudinal direction of the cold mirror 31 in FIG. And a pair of opposing walls 60, 61 facing each other with the cold mirror 31 in between, and a pair of third walls facing each other in a direction substantially perpendicular to the longitudinal direction (the arrow Y direction in FIG. 4). It is provided along the fourth side surface portions (side surface portions) P3 and P4, and is composed of a pair of opposing walls 62 and 63 facing each other with the cold mirror 31 interposed therebetween.

  In the following description, one opposing wall 60 of the pair of opposing walls 60 and 61 facing in the direction of the arrow X is referred to as a first opposing wall 60, and the other opposing wall 61 is referred to as a second opposing wall 61. To do. Similarly, one opposing wall 62 of the pair of opposing walls 62 and 63 facing in the arrow Y direction will be described as a third opposing wall 62, and the other opposing wall 63 will be described as a fourth opposing wall 63.

  In the case of this embodiment, as shown in FIG. 5 when viewed from the direction of the arrow Z in FIG. 4, a first elastic piece (1) that can be elastically deformed is formed in the substantially central portion of the first opposing wall 60. Elastic piece) 60a is provided. The first elastic piece 60a includes a first raised portion (bumped portion) 60b having a substantially semi-cylindrical shape on the tip side (see FIG. 4). A slit 60c is provided between the first elastic piece 60a having the first raised portion 60b and the frame portion 33b so that the elastic piece 60a can be elastically deformed.

  In addition, the second opposing wall 62 is also provided with two second elastic pieces (elastic pieces) 62a having the same shape as the first elastic piece 60a described above. The second elastic pieces 62a are each provided with a second raised portion (bump portion) 62b having a curved shape or the like on the tip side. A slit having the same shape as the slit 60c described above that enables the second elastic piece 62a to be elastically deformed also between the second elastic piece 62a having the second raised portion 62b and the frame portion 33b. It goes without saying that (not shown) is provided.

  Further, the number of first elastic pieces 60a and second elastic pieces 62a formed on the first opposing wall 60 and the third opposing wall 62 is arbitrary. Three elastic pieces 60 a may be provided, or two second elastic pieces 62 a may be provided on the third opposing wall 62.

  In addition, the external dimension of the cold mirror 31 in this embodiment is a lateral dimension (dimension with respect to the arrow X direction) when the first case body 33 is viewed in a state where the cold mirror 31 is not stored in the storage wall 33c. Is set to be larger than the distance (shortest distance) from the tip of the first raised portion 60b to the second opposing wall 61 and smaller than the distance between the opposing walls 60 and 61, and its vertical dimension (arrow Y) The dimension with respect to the direction) is set to be larger than the distance (shortest distance) from the tip of the second raised portion 62b to the fourth opposing wall 63 and smaller than the distance between the opposing walls 62 and 63. To do.

  In the present embodiment, a plurality of engaging portions (not shown) are provided at appropriate positions on the outer peripheral portion of the first case body 33, and the engaging portions are described later of the second case body. The first case body 33 and the second case body 34 are fitted and fixed (hook fixed) by being respectively locked by the plurality of locking portions. At this time, the cold mirror 31 has front and back surfaces (that is, the front surface of the cold mirror 31 on the first reflective layer 31b side and the back surface of the cold mirror 31 on the opposite side to the first reflective layer 31b side). The first case body 33 is sandwiched between the frame portion 33b and the second case body 34, which will be described later.

  On the other hand, the 2nd case body 34 consists of a cover part which covers the back side of the cold mirror 31, and is provided with the substantially rectangular flat plate-shaped support part 34a which supports the said back surface of the cold mirror 31 (refer FIG. 3). The second case body 34 is formed with a plurality of locking portions (not shown) corresponding to the respective engaging portions of the first case body 33.

  When attaching (fixing) the cold mirror 31 using the first and second case bodies 33 and 34, detailed illustration is omitted as an example, but first, the back surface of the first case body 33 as shown in FIG. The side surfaces P1, P2, P3, and P4 of the cold mirror 31 are along the opposing walls 60, 61, 62, and 63 of the storage wall 33c with the side (respective elastic pieces 60a and 62a side) facing up. Then, the cold mirror 31 is accommodated (accommodated) in the accommodation wall 33c. At this time, the cold mirror 31 is accommodated so that the required portion of the first reflective layer 31b faces the opening 33a.

  By the way, in this embodiment, the 1st elastic piece 60a which has the 1st protruding part 60b is provided in the 1st opposing wall 60 in the storage wall 33c, and the 2nd protrusion is provided in the 3rd opposing wall 62 in the storage wall 33c. The second elastic piece 62a having the portion 62b is provided.

  And since the said external dimension of the cold mirror 31 is set as mentioned above, when the cold mirror 31 is accommodated in the storage wall 33c, the 1st side surface part P1 of the cold mirror 31 is the 1st elastic piece 60a. (I.e., the first raised portion 60b) is bent outward, and the third side surface P3 of the cold mirror 31 is bent outward while the second elastic piece 62a (i.e., the second raised portion 62b) is bent outward. The side portions P1 to P4 of 31 are housed and fixed along the opposing walls 60 to 63 of the housing wall 33c.

  After the cold mirror 31 is housed in the housing wall 33c, each elastic piece 60a, 62a has a force to return them to the side opposite to the outside (that is, the elastic pieces 60a, 62a are returned to their original positions). A return force that causes the position to return is applied.

  This is because the first raised portion 60b of the first elastic piece 60a formed in contact with the first side surface portion P1 has the cold mirror 31 on the second opposing wall 61 side opposite to the outer side. It means that a pressing force is applied, and the cold mirror 31 is placed on the second protruding portion 62b of the second elastic piece 62a in contact with the third side surface portion P3 on the side opposite to the outer side. This means that a pressing force acts on the fourth facing wall 63 side.

  That is, in the present embodiment, the first raised portion 60b (first elastic piece 60a) presses the first side surface portion P1 of the cold mirror 31 against the second opposing wall 61 side, so that the first At the same time that the second side surface portion P2 is in close contact with the second opposing wall 61, the second raised portion 62b (second elastic piece 62a) causes the third side surface portion P3 of the cold mirror 31 to face the fourth opposing wall 63. By pressing, the fourth side surface portion P4 of the cold mirror 31 is in close contact with the fourth facing wall 63.

  In other words, the cold mirror 31 is housed and fixed in the housing wall 33c by the first raised portion 60b and the second opposing wall 61 without moving in the arrow X direction, and the second raised portion 62b and the second raised wall 62b. 4 is stored and fixed in the storage wall 33c without moving in the direction of the arrow Y (see FIG. 4). As a result, it is possible to suppress backlash (collapse in the surface direction) of the cold mirror 31 with respect to the arrow X direction and the arrow Y direction.

  The plate thickness dimension of the cold mirror 31 and the height dimension of the storage wall 33c (that is, the height dimension of each of the opposing walls 60 to 63) are set to substantially the same dimension. When housed in the housing, the rear surface of the frame 33b and the rear surface of the cold mirror 15 are substantially flush with each other.

  Next, on the storage wall 33c (first case body 33) formed by storing and fixing the cold mirror 31 in which backlash is suppressed in the surface direction as described above, the support portion 34a, the back surface of the cold mirror 31, and The 2nd case body 34 is mounted so that the frame part 33b back surface may contact | abut. At this time, the respective engagement portions provided in the first case body 33 are respectively engaged with the respective engagement portions provided in the second case body 34, so that the cold mirror 31 In the plate thickness direction (the direction orthogonal to the arrow X and Y directions), it is fixed between the frame portion 33b and the support portion 34a. As described above, the cold mirror 31 is attached using the case bodies 33 and 34.

  The second reflector 40 includes a concave mirror 41 that reflects the display light L from the cold mirror 31 (that is, the liquid crystal display element 22), and a mirror holder 42 that holds the concave mirror 41 (see FIG. 2).

  The concave mirror 41 is formed by vapor-depositing a second reflective layer 41a on a resin substrate made of polycarbonate having a concave surface. The concave mirror 41 is disposed in an inclined state at a position where the second reflective layer 41a faces the cold mirror 31 and the translucent cover and faces the translucent cover.

  The concave mirror 41 is for reflecting (projecting) the display light L from the cold mirror 31 toward the translucent cover (the windshield 13 of the vehicle 10). This means that the concave mirror 41 enlarges the display light L reflected by the cold mirror 31 and projects the enlarged display light L onto the windshield 13 through the translucent cover. The concave mirror 41 is bonded to the mirror holder 42 with a double-sided adhesive tape. The mirror holder 42 is made of synthetic resin (for example, ABS resin) and is fixed to the housing 50.

  The housing 50 is made of, for example, a black light-shielding synthetic resin material, is formed in a substantially box shape, and the liquid crystal display 20, the first reflector 30, and the second reflector 40 are placed in a space 51 that is an internal space of the housing 50. The second reflector 40 is provided with an opening window portion 52 that is open at an upper portion (on the windshield 13 side) where the concave mirror 41 is disposed.

  Further, the housing 50 is provided with a translucent cover 53 that is an emitting portion so as to close the opening window portion 52. The translucent cover 53 is made of a translucent synthetic resin material (for example, acrylic resin), is formed in a curved shape (curved surface shape), and transmits light that allows the display light L reflected by the concave mirror 41 to pass (pass). It has a function as a sex member. That is, the display light L reflected by the cold mirror 31 and the concave mirror 41 is projected onto the windshield 13 through the translucent cover 53 formed on the housing 50, thereby displaying the virtual image V.

  As described above, the present embodiment includes the liquid crystal display element 22 that emits the display light L, the cold mirror 31 that reflects the display light L, and the case member 32 that includes the storage wall 33c that stores the cold mirror 31. In the head-up display device that projects the display light L reflected by the cold mirror 31 onto the windshield 13 and displays a virtual image, the storage wall 33c has a pair of first and second side portions P1 opposed to the cold mirror 31, A pair of first and second opposing walls 60 and 61 that are provided along P2 and are opposed to each other with the cold mirror 31 interposed therebetween, and of the pair of first and second opposing walls 60 and 61 One opposing wall (first opposing wall) 60 has a first raised portion 60 b that presses the cold mirror 31 toward the other opposing wall (second opposing wall) 61. 1 of the elastic pieces 60a is formed.

  The storage wall 33c is provided along a pair of third and fourth side surface portions P3 and P4 facing each other of the cold mirror 31, and a pair of third and fourth opposing walls facing each other with the cold mirror 31 interposed therebetween. 62, 63, and one of the pair of third and fourth opposing walls 62, 63 has one opposing wall (third opposing wall) 62 and the cold mirror 31 on the other opposing wall (fourth). A second elastic piece 62a having a second raised portion 62b that is pressed to the opposite wall 63) side is formed.

  Accordingly, the cold mirror 31 is housed and fixed in the housing wall 33c by the first raised portion 60b (first elastic piece 60a) and the second opposing wall 61 without moving in the direction of the arrow X, and the second The raised portion 62b (second elastic piece 62a) and the fourth opposing wall 63 are housed and fixed in the housing wall 33c without moving in the arrow Y direction. It is possible to provide a head-up Y display device that is less likely to cause rattling.

  In the present embodiment, among the four opposing walls 60 to 63 constituting the storage wall 33c, the first and second opposing walls 60 and 62 that are not in a positional relationship facing each other are respectively connected to the first and second opposing walls 60 and 62. Although the example which provided the elastic pieces 60a and 62a was demonstrated, the 1st elastic piece 60a is abolished among each elastic pieces 60a and 62a, for example, and the cold mirror 31 is made into 4th by the 2nd elastic piece 62a. The opposing wall 63 side is pressed, or the second elastic piece 62a is eliminated from the elastic pieces 60a and 62a, and the cold mirror 31 is moved to the second opposing wall 61 by the first elastic piece 60a. Even if it is the case where it is the structure pressed against the side, the effect similar to this embodiment can be acquired.

  In the present embodiment, an example in which each raised portion 60b, 62b has a substantially semi-cylindrical shape has been described. However, the shape of each raised portion 60b, 62b includes the cold mirror 31 in the second and fourth opposing walls 61, Any shape can be adopted as long as it can be pressed against the 63 side. For example, the shapes of the raised portions 60b and 62b may be prismatic shapes.

1 is a schematic view of a head-up display device according to an embodiment of the present invention. It is sectional drawing of the head-up display apparatus by the same embodiment. It is sectional drawing of the 1st reflector by the embodiment. It is a rear view of the 1st case body by the embodiment. It is a figure which shows a part of 1st case body when it sees from the arrow Z direction in FIG. It is sectional drawing of the reflection member and case member by a prior art.

Explanation of symbols

13 Windshield (projection member)
20 Liquid crystal display 22 Liquid crystal display element (display element)
30 1st reflector 31 Cold mirror (reflective member)
32 Case member 33 1st case body 33a Opening part 33b Frame part 33c Storage wall (storage part)
34 Second case body 60 First opposing wall (one opposing wall)
60a First elastic piece (elastic piece)
60b First raised portion 61 Second opposing wall (the other opposing wall)
62 3rd opposing wall (one opposing wall)
62a Second elastic piece (elastic piece)
62b Second raised portion 63 Fourth opposing wall (the other opposing wall)
L Display light P1 First side surface (side surface)
P2 Second side surface (side surface)
P3 Third side (side)
P4 4th side surface (side surface)

Claims (1)

A display element that emits display light, a reflective member that reflects the display light, and a case member that has a storage portion that stores the reflective member;
In the head-up display device that projects the display light reflected by the reflecting member onto a projection member and displays a virtual image,
The storage portion is provided along a pair of opposing side surface portions of the reflective member, and includes a pair of opposed walls that are opposed to each other with the reflective member interposed therebetween.
One of the pair of opposing walls is formed with an elastic piece that presses the reflecting member against the other opposing wall side.

Images