JP2011150099A - Mirror unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mirror unit capable of realizing reduction in cost, in the mirror unit used for a display device, such as, a head-up display. <P>SOLUTION: The mirror unit 40 includes a reflecting mirror 41, with a reflecting film 44a formed on the front part 44 of a substrate 43 made of resin; and a driving means 42 for adjusting the angle of inclination of the reflecting mirror 41, by making the reflecting mirror 41 drive rotationally about a rotation axis line RA; and in the mirror unit, the side-face part 46 of the substrate 43 is configured to form a mounting part 47 for attaching the reflecting mirror 41 to a housing 50, which is a predetermined mounting member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mirror unit used in a display device such as a head-up display.

  Conventionally, as a display device using a mirror unit having a reflection mirror that reflects display light, there is a head-up display, which is disclosed in Patent Document 1, for example. Such a head-up display described in Patent Document 1 is attached to the inside of an instrument panel (hereinafter referred to as an instrument panel) of a vehicle, and projects display light emitted from a display device onto a windshield (projection member) of the vehicle. A virtual image is displayed to a vehicle user (driver).

  The display device described above includes a light source, a display that emits display light as the light source emits light, a mirror unit that reflects the display light emitted from the display to the windshield, a light source, a display, and a mirror unit. And a housing having a translucent part that transmits display light reflected by the mirror unit (the reflection mirror), and the display light reflected by the reflection mirror is transmitted through the translucent part. A virtual image is displayed by projecting on the windshield through the unit.

  The mirror unit, which is a component of the display device, includes a concave mirror that is a reflection mirror, a mirror holder that holds the concave mirror, and the mirror holder that is driven to rotate about a predetermined rotation axis, thereby tilting the mirror holder. In this case, the driving means is composed of a stepping motor and an output gear attached to the tip of the driving shaft of the stepping motor, and is fixed to the housing using a fixing means as appropriate. .

  The concave mirror includes a substrate that is a base material of the concave mirror and a reflective film that is formed on the front surface of the substrate (the surface facing the display). The substrate is made of a resin such as polycarbonate having a predetermined plate thickness, and the front surface portion and the back surface portion opposite to the front surface portion are formed so as to form a concave curved surface having a predetermined curvature.

  The reflective film is made of a metal such as aluminum and is formed on the front surface of the substrate by means such as vapor deposition. Therefore, the front surface portion of the concave mirror after the formation of the reflective film is a reflective surface composed of a concave curved surface (that is, a concave surface). Thus, the concave mirror in which the reflective film is formed on the front surface portion of the substrate has a function of expanding the display light emitted from the display and projecting the expanded display light onto the windshield through the light transmitting portion.

  The mirror holder is made of a synthetic resin material, and includes a substantially rectangular flat plate-shaped main body portion that holds the concave mirror. On both sides of the main body portion, substantially cylindrical shaft portions are respectively formed so as to protrude. A gear portion is provided at the tip of one of the shaft portions. The two shaft portions are formed so as to protrude outward from both side wall portions of the main body portion so that their axis lines coincide with the rotation axis line, and the gear portion is an output gear attached to the tip of the drive shaft of the stepping motor. Are integrally formed with the main body portion.

  Of the two shaft portions, the other shaft portion where the gear portion is not formed is pivotally supported by a shaft support portion having a hollow shape provided in the housing, so that the mirror unit is attached and fixed to the housing.

  When the stepping motor is driven, the driving force by the stepping motor is transmitted to the gear portion via the output gear. Along with the transmission of power (driving force) to the gear portion, the gear portion rotates about the shaft portion (that is, the rotation axis of the mirror holder), and the concave mirror held by the mirror holder and the mirror holder thereby rotates the rotation axis. Is configured to rotate by a predetermined angle around the center. Thus, the projection direction with respect to the windshield of display light can be adjusted by changing the inclination angle of the concave mirror.

JP 2006-119384 A

By the way, when paying attention to the mirror unit provided in the display device described in Patent Document 1, the concave mirror (reflecting mirror) constituting the main part of the mirror unit is attached and fixed to the housing via the mirror holder that holds the mirror. It has a configuration. In such a configuration, when the reflection mirror is attached to the housing, a dedicated mirror holder for holding the reflection mirror is separately required. Therefore, the number of parts constituting the mirror unit increases, and the assembling cost and the part cost increase. , Which was the cause of the cost increase.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mirror unit that can realize cost reduction in order to cope with the above-described problems.

  The present invention provides a mirror unit having at least a reflection mirror having a reflection film formed on a front surface portion of a resin substrate, wherein the reflection mirror is attached to a predetermined mounting member at a predetermined position of the substrate excluding the front surface portion. A mounting portion for mounting is formed.

  Further, the present invention is characterized in that the attachment portion is provided at a side portion of the substrate at a position away from the front surface portion.

  ADVANTAGE OF THE INVENTION According to this invention, the mirror unit which can achieve an initial objective and can implement | achieve cost reduction can be provided.

1 is a schematic diagram of a head-up display according to a first embodiment of the present invention. The side view of the display apparatus by the embodiment. The figure which expands and shows a mirror unit in FIG. The front view of a reflective mirror when it sees from the arrow A direction in FIG. BB sectional drawing of FIG. Sectional drawing of the reflective mirror by 2nd Embodiment of this invention.

(First Embodiment) An embodiment in which the mirror unit of the present invention is applied to a head-up display for a vehicle will be described below with reference to FIGS.

  As shown in FIG. 1, the head-up display is configured such that the display light L projected by the display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10 is the windshield 13 of the vehicle 10 that is a projection member. The virtual image V is displayed by reflecting in the direction of the driver (user) 14. In other words, the head-up display emits (projects) display light L emitted from a liquid crystal display (described later) of the display device 12 onto the windshield 13 (the projection member), and a display image (virtual image) obtained by the emission. ) V is made visible to the driver 14. Thus, the driver 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 that is a mirror unit, and a housing 50.

  The liquid crystal display 20 has a light source 21 composed of a light emitting diode mounted on the wiring board H and a front side (directly above) the light source 21 so as to transmit the illumination light from the light source 21 to form display light L. It is mainly comprised from the TFT type liquid crystal display element 22 located. 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 has a cold mirror 31 and a fixing member 32 for mounting and fixing the cold mirror 31 using a predetermined fixing means. The cold mirror 31 includes a substantially rectangular glass substrate 31a and a 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 reflective layer 31b is made 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 reflective layer 31 b is configured to pass through the cold mirror 31. The fixing member 32 is made of a synthetic resin material and is fixed to the housing 50.

  As shown in detail in FIG. 3, the second reflector 40 which is a mirror unit is a concave mirror 41 which is a reflection mirror disposed so as to be inclined in the housing 50 so as to reflect the display light L from the cold mirror 31. And a driving means 42 for rotating the concave mirror 41 and adjusting the inclination angle of the concave mirror 41.

  The concave mirror 41 includes a substrate 43 made of resin (for example, polycarbonate), and a reflective film 44a made of a metal such as aluminum formed on the front surface 44 of the substrate 43 (that is, the surface facing the reflective layer 31b of the cold mirror 31). The front surface 44 and the back surface 45 of the substrate 43 positioned on the opposite side of the front surface 44 are both concave curved surfaces (concave surfaces) having a predetermined curvature. In this case, the substrate 43 is formed by injection molding.

  Accordingly, when the reflection film 44a is formed on the front surface portion 44 of the substrate 43 formed as the concave surface, the front surface portion 44 reflects the display light L from the cold mirror 31 toward the light-transmitting cover side described later of the housing 50. It becomes the light reflection surface for making it. The concave mirror 41 is inclined in a position where the front surface portion 44 (that is, the light reflecting surface) on which the reflecting film 44a is formed faces the cold mirror 31 and the light transmitting cover and faces the light transmitting cover. Arranged.

  Further, the concave mirror 41 in which the reflective film 44a is formed on the front surface portion 44 of the substrate 43 reflects the light L from the cold mirror 31 toward the translucent cover (the windshield 13 of the vehicle 10) ( Projection). 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.

  Incidentally, FIG. 4 shows a front view of the reflection mirror 41 when viewed from the direction of arrow A in FIG. In this case, the external shape of the reflection mirror 41 when the reflection mirror 41 is viewed from the front is formed in a substantially rectangular shape as shown in FIG. 4, and the four side surfaces on the top, bottom, left and right of the substrate 43 that is the base material of the reflection mirror 41. In the portion 46, a substantially cylindrical first shaft portion 47 is formed so as to protrude from a substantially central portion of the side portion 46 located on the left side in FIG. The first shaft portion 47 is pivotally supported by a later-described shaft support portion formed integrally with the housing 50.

  In addition, among the four side surface portions 46, a substantially cylindrical second shaft portion so as to form a pair with the first shaft portion 47 is formed at a substantially central portion of the side surface portion 46 located on the right side in FIG. 4. 48 is formed in a projecting manner, and a gear portion 48 a that meshes with an output gear, which will be described later, provided in the driving means 42 is integrally formed on the distal end side of the second shaft portion 48. In the present embodiment, the central axis of each of the shaft portions 47 and 48 is rotated by the concave mirror 41 receiving the driving force from the driving means 42 as shown in FIG. 5 which is a BB sectional view of FIG. It is assumed that it coincides with the rotation axis RA of the concave mirror 41 at the time of driving.

  Each of the shaft portions 47 and 48 has 46 side surface portions located at a predetermined distance from the front surface portion 44 of the substrate 43 on which the reflective film 44a is formed, in this case, about a few millimeters below the front surface portion 44. It is provided in a substantially central region of the side surface portion 46. Thus, by providing the shaft portions 47 and 48 in a substantially central region of the side surface portion 46 located away from the front surface portion 44, the front surface portion 44 near the shaft portions 47 and 48 when the substrate 43 is injection molded. There is a merit that distortion occurring in the place is prevented, and the substrate 43 without distortion deformation can be obtained on the front surface portion 44.

  On the other hand, the driving means 42 includes a stepping motor 42a that generates a driving force by energization, and an output gear 42c that is attached to the tip of the driving shaft 42b of the stepping motor 42a. The output gear 42c and the second shaft portion 48 are provided. The gear portion 48a attached to the tip is engaged with the gear portion 48a.

  Further, in this case, as shown in FIG. 5, a support body, which will be described later, integrally formed with the housing 50 fixes and supports the stepping motor 42a constituting the main part of the drive means 42 in an immobile state. That is, the second shaft portion 48 is fixed to the housing 50 through a gear portion 48a attached to the tip of the second shaft portion 48 and a driving means 42 provided with an output gear 42c engaged with and fixed to the gear portion 48a. .

  The housing 50 is made of, for example, a black light-shielding synthetic resin material, and is formed in a substantially box shape. The housing 50 holds the liquid crystal display 20 and the first and second reflectors 30 and 40 in the space 51 that is the internal space. And includes an opening window 52 in which an upper portion (on the side of the windshield 13) of the concave mirror 41 in the second reflector 40 is opened.

  The housing 50 is provided with a translucent cover 53 which is a translucent part so as to close the opening window part 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. In other words, the display light L reflected by the concave mirror 41 is projected onto the windshield 13 through the translucent cover 53 formed in the housing 50, whereby the virtual image V is displayed to the driver 14.

  Furthermore, in the case of this embodiment, the boss part 54 and the support body 55 are integrally formed in the housing 50 toward the space part 51 side (second reflector 40 side) (see FIG. 5). 54 has a convex shape, and a shaft support portion 54a having a hollow shape for supporting the first shaft portion 47 is provided at the tip thereof. The support body 55 has a boss shape, and a stepping motor 42a is placed on the tip portion.

  Here, when attention is paid to the housing 50 and the substrate 43 which is a base material of the reflection mirror 41, the reflection film 44a is formed on the side surface portion 46 of the substrate 43 which is a predetermined portion of the substrate 43 except the front surface portion 44. The above-described first shaft portion 47 that is an attachment portion for attaching the substrate 43 (that is, the reflection mirror 41) to the housing 50 that is an attachment member is formed. Specifically, the first shaft portion 47, which is an attachment portion, is supported by the shaft support portion 54 a of the housing 50, whereby the reflection mirror 41 is attached to the housing 50.

  When the stepping motor 42a is driven with the reflection mirror 41 attached to the housing 50, the driving force by the stepping motor 42 is transmitted to the gear portion 48a via the output gear 42c. Along with the transmission of power (driving force) to the gear portion 48a, the gear portion 48a rotates about the rotation axis RA, whereby the concave mirror 41 rotates (rotates) by a predetermined angle about the rotation axis RA. It has a configuration. Thus, the projection direction with respect to the windshield 13 of the display light L can be adjusted because the inclination-angle of the concave mirror 41 changes.

  As described above, in this embodiment, in the mirror unit 40 having the reflection mirror 41 in which the reflection film 44a is formed on the front surface portion 44 of the resin substrate 43, the substrate that is a predetermined portion of the substrate 43 excluding the front surface portion 44. A first shaft portion 47 that is an attachment portion for attaching the reflection mirror 41 to the housing (attachment member) 50 is formed on the side face portion 46 of the reference numeral 43.

  Therefore, the reflection mirror 41 can be attached to the housing 50 by using the first shaft portion (attachment portion) 47 formed integrally with the substrate 43 which is the base material of the reflection mirror 41, and the reflection mirror is held as in the prior art. Therefore, it is unnecessary to pivotally support the shaft portion formed integrally with the mirror holder to the shaft support portion provided in the housing. According to such a configuration, a mirror holder for holding a reflection mirror, which has been conventionally necessary as a component of the mirror unit, is not necessary, so that the number of components can be reduced and cost reduction can be realized. .

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals are used for the same or corresponding parts as in the first embodiment, and the detailed description thereof will be made. Omitted. In the second embodiment, a first shaft portion 49 corresponding to the first shaft portion (attachment portion) 47 employed in the first embodiment is provided on the back surface portion 45 of the substrate 43, and the first shaft portion 49 is provided. The shaft portion 49 is pivotally supported by a shaft support portion 56 a of a boss portion 56 formed integrally with the housing 50.

  As shown in FIG. 6, the first shaft portion 49 is composed of a substantially cylindrical projecting portion that projects from the left end side of the back surface portion 45 in a direction opposite to the projecting direction of the second shaft portion 48. The axial direction substantially coincides with the axial direction of the second shaft portion 48 (or the drive shaft 42b of the stepping motor 42a).

  Also, the housing 50 is integrally formed with a boss portion 56 having substantially the same shape as the boss portion 54 employed in the first embodiment toward the reflecting mirror 41, and is provided at the tip of the boss portion 56. The first shaft portion 49 is pivotally supported by a shaft support portion 56a having a hollow shape.

  According to the second embodiment, the first shaft portion 49 that is an attachment portion is supported by the shaft support portion 56 a of the housing 50, whereby the reflection mirror 41 is attached to the housing 50. According to such a configuration, a mirror holder for holding a reflection mirror, which has been conventionally necessary as a component of the mirror unit, is not necessary, so that the number of components can be reduced, and the same effect as the first embodiment. Can be obtained.

  In each of the above embodiments, the example in which the concave mirror 41 is employed as the reflection mirror has been described. However, for example, a convex mirror or a plane mirror may be employed in place of the concave mirror 41.

  In each of the above embodiments, the example in which the display light L emitted from the liquid crystal display element 22 is projected onto the windshield 13 has been described. For example, the display light L is favorably reflected in the direction of the driver 14 on the windshield 13. A combiner film may be provided, or the display light L may be projected onto a dedicated reflector different from the windshield 13.

12 Display Device 20 Liquid Crystal Display 30 First Reflector 40 Second Reflector (Mirror Unit)
41 Concave mirror
42 Driving means 42a Stepping motor 42c Output gear 43 Substrate 44 Front surface (first concave surface)
44a Reflective film 45 Back surface (second concave surface)
46 Side surface portion 47, 49 First shaft portion (mounting portion)
48 Second shaft portion 48a Gear portion 50 Housing (mounting member)
54, 56 Boss part 54a, 56a Shaft support part 55 Support body L Display light RA Rotation axis

Claims (2)

In a mirror unit having at least a reflection mirror in which a reflection film is formed on the front surface portion of a substrate made of resin,
A mirror unit, wherein a mounting portion for mounting the reflection mirror to a predetermined mounting member is formed at a predetermined portion of the substrate excluding the front surface portion. 2. The mirror unit according to claim 1, wherein the attachment portion is provided at a side portion of the substrate at a position away from the front surface portion.

Images