JP2009067352A - Head-up display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device capable of improving productivity of a housing by eliminating a troublesome work such as masking. <P>SOLUTION: This head-up display device includes a liquid crystal display element 22 emitting display light L, a cold mirror 31 reflecting the display light L, the housing 50 storing the liquid crystal display element 22 and cold mirror 31, and a shielding member 60 preventing irradiation of light from the outside to the liquid crystal display element 22 and cold mirror 31, and performs display by projecting the display light L reflected by the cold mirror 31 onto a projecting member 13 through an emitting part 53 provided for the housing 50. The shielding member 60 is formed separately from the housing 50, and the shielding member 60 and housing 50 are fixed by a screw S. <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 of a vehicle.

  Conventionally, in this type of head-up display device, for example, as described in Patent Document 1 below, a device that projects a display light from a display on 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 emitting portion formed on the housing to display a virtual image.

In this case, the housing has an opening on the front wall, and the transparent cover made of a curved surface for transmitting the display light reflected by the concave mirror to the opening (corresponding to the emission part). Is configured to be attached. In addition, the housing has a shielding wall (shielding member) made of an inclined wall for preventing light from outside such as sunlight from being irradiated to the display element disposed in the internal space of the housing and the cold mirror. The housing is integrally formed (integrated) with the housing so as to hang down from the front wall of the housing toward the internal space.
JP 2006-91489 A

  Thus, in the case of the head-up display device described in Patent Document 1, the housing is integrally provided with an inclined shielding wall for preventing the display element and the cold mirror from being irradiated with external light such as sunlight. It has a molded configuration. By the way, in such a configuration, when light from the outside passes through the curved light-transmitting cover and hits the shielding wall, the light hitting the shielding wall becomes reflected light and transmits again through the light-transmitting cover. Then, an unnecessary image that should not be displayed may be generated by being projected on the projection member (the windshield of the vehicle).

Therefore, in order to solve such a problem, for example, in the housing before the translucent cover is attached, the reflected light is generated on the surface of the inclined shielding wall (surface located on the translucent cover side). In order to suppress this, matte paint must be applied. However, when matte coating is applied only to the shielding wall surface of the housing, the shielding wall (shielding member) is formed integrally with the housing. Masking is necessary and the work becomes complicated. As a result, when mass-producing a housing which is one component in the head-up display device, there is a problem that the productivity of the housing is reduced, and there is still room for further improvement in this respect.
Accordingly, the present invention is directed to providing a head-up display device capable of improving the productivity of the housing by eliminating the complicated work such as masking 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, a housing that houses the display element and the reflective member, and light from the outside that is applied to the display element and the reflective member. A head-up display device for performing display by projecting the display light reflected by the reflecting member onto a projection member through an emitting portion formed on the housing. It is formed separately from the housing, and the shielding member and the housing are fixed by a predetermined fixing means.

  According to the present invention, it is possible to provide a head-up display device capable of achieving the initial purpose, eliminating the need for complicated work such as masking, and improving the productivity of the housing.

  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 and 2 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. FIG. 2 is a cross-sectional view of the head-up display device according to the embodiment. FIG.

  As shown in FIG. 1, the head-up display device uses the windshield 13 of the vehicle 10 that is a projection member to project 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, a housing 50, and a shielding member 60.

  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 an attachment member 32 for attaching and fixing the cold mirror 31 using predetermined attachment means. The cold mirror 31 includes a substantially rectangular glass substrate 31a and a first reflective layer 31b formed on one surface of the glass substrate 31a (a surface facing a concave mirror described later of the second reflector 40). . 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. Further, 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 (liquid crystal display element 22) is reflected toward the second reflector 40 (the concave mirror). .

  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. The attachment member 32 is made of, for example, a black synthetic resin material and is fixed to the housing 50.

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

  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 (liquid crystal display element 22) or the first reflector 30 (cold) is formed in the space 51 that is the internal space. The mirror 31) and the second reflector 40 are held and accommodated, and an opening window 52 is provided in which an upper portion (on the windshield 13 side) of the concave mirror 41 in the second reflector 40 is opened. Become.

  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. In the case of the present embodiment, when external light such as sunlight (that is, external light) is reflected by the translucent cover 53, the reflected light is reflected to the user 14 side through the windshield 13. It is assumed that the curved shape of the translucent cover 53 is set so as to have a curvature that is not performed.

  The front wall 54 of the housing 50, which is the upper part of the position where the cold mirror 31 is disposed, is provided with a substantially cylindrical boss portion 55 protruding toward the cold mirror 31 side. The boss portion 55 includes a screw screw portion 56 for screwing a screw S as a fixing means.

  The shielding member 60 is made of, for example, a black light-shielding synthetic resin material, and is disposed in the space 51 in the housing 50. In this case, the shielding member 60 is formed as a separate body (separate member) from the housing 50.

  The shielding member 60 includes a flat plate portion 61 disposed along the back surface of the boss portion 55, and the translucent cover 53 and the front wall 54 from the end of the flat plate portion 61 on the translucent cover 53 side. An inclined wall 62 provided so as to form an inclined shape toward the boundary portion of the liquid crystal display device, and a slanting wall 62 formed so as to hang obliquely from the boundary portion toward the concave mirror 41 side. The first reflector 30 (cold mirror 31) includes a shielding wall 63 for preventing the external light from being irradiated.

  In this case, the shielding part 63 extends in a direction substantially orthogonal to the inclined wall 62, and in addition to the function as a shielding part for preventing the external light from being irradiated, the liquid crystal display 20 and It has a function as a concealing unit for concealing the first reflector 30. The flat plate portion 61 is formed in a substantially circular opening so as to communicate with the screw threaded portion 56, and is formed with a screw hole 61a for allowing the screw portion of the screw S to pass therethrough.

  Then, the entire surface of the shielding member 60 having the flat plate portion 61, the inclined wall 62, and the shielding wall 63 is matted. Specifically, the matte coating is performed on the surface portion P of the shielding member 60 in FIG. At this time, since the shielding member 60 is formed separately from the housing 50, the matte coating can be performed on the entire surface portion P of the shielding member 60 alone. In other words, when the shielding member (shielding wall) and the housing are integrally formed as in the prior art, a complicated operation such as masking other parts of the housing other than the shielding wall that does not require matte coating is unnecessary. Thus, the matte coating can be performed on the entire surface portion P of the shielding member 60 alone.

  Thereafter, the shielding member 60 on which the matte coating has been performed and the housing 50 are fixed to the surface portion P with screws S. That is, when fixing the shielding member 60 to the housing 50, first, the shielding member 60 and the housing 50 are aligned so that the screw hole 61 a of the flat plate portion 61 corresponds to the screw threaded portion 56 of the boss portion 55. At this time, the shielding member 60 and the housing 50 are aligned so that the surface portion P of the shielding member 60 faces the translucent cover 53 and the front wall 54 of the housing 50.

  Then, the screw portion of the screw S is passed through the screw hole 61a, and a required portion of the screw portion that passes through the screw hole 61a is screwed into a screw screwing portion 56 provided in the boss portion 55. The fixing operation between the housing 50 and the shielding member 60 is completed. In addition, although detailed illustration is abbreviate | omitted, in this embodiment, the screw hole 61a is provided in the flat plate part 61 at two places, and the screw screwing part 56 is provided in two places so as to correspond to each screw hole 61a. Shall. This means that the housing 50 and the shielding member 60 are fixed using the two screws S.

  As described above, in the present embodiment, the liquid crystal display element 22 that emits the display light L, the cold mirror 31 that reflects the display light L, the liquid crystal display element 22, the housing 50 that houses the cold mirror 31, and the liquid crystal display element 22. And a shielding member 60 for preventing the cold mirror 31 from being irradiated with the external light, and the display light L reflected by the cold mirror 31 and the concave mirror 41 is projected onto the windshield 13 through the emitting portion 53 to perform display. In the head-up display device, the shielding member 60 is formed separately from the housing 50, and the shielding member 60 and the housing 50 are fixed with screws S.

  That is, after the matte coating is performed without masking the shielding member 60 formed separately from the housing 50, the screw S is attached to the housing 50 with the mating shielding member 60 alone. Since it is configured to be used and fixed, the complicated operation of masking, which has been necessary in the past, is unnecessary, and the housing can be easily manufactured. As a result, it is possible to improve the productivity of the housing when mass-producing the housing which is one component in the head-up display device.

  In the present embodiment, the example in which the housing 50 and the shielding member 60 are fixed by the fixing means including the screw S has been described. However, the fixing means is not limited to the screw S, and for example, instead of the screw S. It is also possible to fix the housing 50 and the shielding member 60 by fixing by welding or fixing by a hook.

  In the present embodiment, an example in which the display light L emitted from the liquid crystal display element 22 is projected onto the windshield 13 has been described. However, for example, a combiner that favorably reflects the display light L toward the user 14 on the windshield 13. A film may be provided, or the display light L may be projected onto a dedicated reflecting member different from the windshield 13.

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.

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)
40 Second reflector 41 Concave mirror 50 Housing 51 Space part 52 Opening window part 53 Translucent cover (outgoing part)
60 shielding member 63 shielding wall L display light S screw (fixing means)

Claims (1)

A display element that emits display light, a reflective member that reflects the display light, a housing that houses the display element and the reflective member, and prevents the display element and the reflective member from being irradiated with external light. A shielding member,
In a head-up display device that performs display by projecting the display light reflected by the reflective member onto a projection member through an emission portion formed in the housing,
The head-up display device, wherein the shielding member is formed separately from the housing, and the shielding member and the housing are fixed by a predetermined fixing means.

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