JP2018076071A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display device capable of suppressing reduction in detection accuracy of external light by an external light detection element.SOLUTION: A head-up display device comprises: a light emission type display 20 for emitting display light L; a concave mirror 31 for reflecting the display light L; a circuit board 42 having an optical sensor (an external light detection element) 41 mounted thereon; and a housing 50 for accommodating them. In the housing 50, there is formed a light shielding part 56 for preventing external light from entering the light emission type display 20. The optical sensor 41 is mounted through a sensor holder 43 on the circuit board 42. The sensor holder 43 includes an enclosure 45 having pores 44 for enclosing the optical sensor 41. A penetration part 57 is formed in such a portion of the light shielding part 56 corresponding to the pores 44. The sensor holder 43 is fixed to the light shielding part 56.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a head-up display device that projects display light emitted from a light-emitting display device onto a projection member such as a windshield of a vehicle and displays a virtual image to an observer.

  Conventionally, as this type of head-up display device, for example, one described in Patent Document 1 below is known. The head-up display device described in Patent Document 1 includes a light-emitting display that emits display light, a reflective member that reflects display light, and an external light detection element that detects illuminance of external light and outputs illuminance data. A housing having a mounted (arranged) circuit board, a housing for accommodating the light emitting display, the reflecting member, and the circuit board; and a control means for adjusting the light emission luminance of the light emitting display based on the illuminance data. The light shielding portion for preventing the outside light such as sunlight from entering the light emitting display through the light transmitting portion formed in the housing is formed, and the display light reflected by the reflecting member is transmitted to the vehicle through the light transmitting portion. Is projected onto a projection member such as a windshield, and a virtual image is displayed to an observer.

  In this case, the external light detection element is mounted (arranged) on the circuit board through the holder, and the holder has an enclosing portion having a hole for enclosing the external light detection element. A corresponding light shielding portion is provided with a through portion for guiding external light to the hole.

JP 2004-338578 A

  In the case of the above-described head-up display device, the external light detection element is disposed in the hole portion of the surrounding portion provided in the holder, while the light shielding portion of the housing has a through hole made of a through hole so as to correspond to the hole portion of the holder. The outside light detection element is arranged in the hole through the light transmitting part of the housing, the penetrating part of the light shielding part, and the hole of the holder. Detected by.

By the way, when the holder is fixed to the housing using a screw, due to an attachment error when attaching the holder to the housing, the hole portion of the holder is displaced with respect to the penetrating portion of the light shielding portion, and as a result, The detection range of the external light by the external light detection element is narrowed, and there is a possibility that the detection accuracy by the external light detection element is lowered.
Accordingly, an object of the present invention is to provide a head-up display device capable of suppressing a decrease in detection accuracy of external light by an external light detection element in order to cope with the above-described problems.

  The present invention includes a light-emitting display that emits display light, a reflective member that reflects the display light, a circuit board on which an external light detection element that detects illuminance of external light and outputs illuminance data is provided, A housing that houses at least the reflecting member and the circuit board; and a control unit that adjusts the light emission luminance of the light emitting display based on the illuminance data, wherein the external light is transmitted to the housing. A light shielding portion that prevents the light from being incident on the light emitting display through the formed light transmitting portion is formed, the external light detection element is disposed on the circuit board through a holder, and the holder is connected to the external light. A surrounding portion having a hole portion for surrounding the detection element, and a penetrating portion for guiding the external light to the hole portion is provided at the light shielding portion corresponding to the hole portion, and the reflection Anti-material Is obtained by projecting the display light to the projection member through the transparent portion, in the head-up display apparatus for performing virtual image display to the viewer, the holder is characterized in that it is fixed to the light shielding portion.

  In the invention, it is preferable that the housing has a restricting portion for restricting the position of the circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, the initial objective can be achieved and the head-up display apparatus which can suppress the fall of the detection accuracy of the external light by an external light detection element can be provided.

1 is a schematic view of a head-up display device according to an embodiment of the present invention. Sectional drawing of the display apparatus by the embodiment. Sectional drawing which shows the principal part which shows a part of housing and external light sensor unit by the same embodiment. The perspective view of the external light sensor unit by the embodiment. Schematic which shows the state by which the external light sensor unit was screw-fixed to the boss | hub part of the housing by the embodiment. The block diagram which shows the electric constitution of the display apparatus by the embodiment.

  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 FIGS.

  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. It is reflected in the direction of the driver (observer) 14 of the vehicle 10 to display the virtual image V on the driver 14. In other words, the head-up display device irradiates (projects) the display light L emitted from a later-described light emitting display of the display device 12 onto the windshield 13 (the projection member), and the virtual image ( Display image) V is visually recognized by the driver 14. Thus, the driver 14 can observe the virtual image V displayed in front of the driver's seat in a superimposed manner with the scenery.

  As shown in FIG. 2, the display device 12 mainly includes a light emitting display 20 that emits display light L, a reflector 30, an external light sensor unit 40, and a housing 50.

  The light emitting display 20 is mainly composed of, for example, a liquid crystal display element 21, a lens 22, a light source 23, a wiring board 24, and a housing 25.

  The liquid crystal display element 21 has, for example, a polarizing plate attached to both front and rear surfaces of a TFT type liquid crystal panel, and displays vehicle speed and the like. The lens 22 is made of a light-transmitting synthetic resin such as acrylic and is disposed between the liquid crystal display element 21 and the light source 23. The light source 23 includes a chip-type light emitting diode that emits light in an appropriate color, and illuminates the liquid crystal display element 21 via the lens 22. That is, when the light source 23 emits light, display light is emitted from the liquid crystal display element 21.

  Further, the wiring board 24 is made of a hard circuit board provided with a predetermined wiring pattern, and a control means, which will be described later, which is a microcomputer, is conductively connected to the wiring pattern. The housing 25 accommodates the liquid crystal display element 21, the lens 22, the light source 23, and the wiring substrate 24, and is an abbreviation for allowing the display light L to pass at a position corresponding to the display surface of the liquid crystal display element 21. A rectangular opening (not shown) is formed.

  The reflector 30 includes a concave mirror (reflecting member) 31 that reflects the display light L emitted from the liquid crystal display element 21 (light emitting display 20), and a mirror holder 32 that holds the concave mirror 31.

  The concave mirror 31 is formed by depositing a reflective film 31a on a resin substrate made of polycarbonate having a concave surface. The concave mirror 31 is disposed in an inclined state at a position where the reflective film 31a faces a translucent cover (described later) of the housing 50 and faces the translucent cover.

  The concave mirror 31 reflects (projects) the display light L from the liquid crystal display element 21 toward the translucent cover (the windshield 13 of the vehicle 10). This means that the concave mirror 31 enlarges the display light L from the liquid crystal display element 21 and projects the enlarged display light L onto the windshield 13 through the translucent cover. The concave mirror 31 is bonded to the mirror holder 32 with a double-sided adhesive tape. The mirror holder 32 is made of synthetic resin (for example, ABS resin), and is fixed to the housing 50.

  As shown in FIGS. 3 and 4, the external light sensor unit 40 includes an optical sensor 41 as an external light detection element, a circuit board 42 on which the optical sensor 41 is mounted (arranged), and a sensor holder 43 as a holder. In this case, the optical sensor 41 is mounted (arranged) on the circuit board 42 through (via) the sensor holder 43.

  For example, a photodiode can be applied to the optical sensor 41. The optical sensor 41 detects the illuminance of external light and outputs illuminance data to the control means. In addition, the optical axis of the optical sensor 41 faces the vehicle front side (the translucent cover side), and detects the illuminance in front of the vehicle.

  The circuit board 42 is formed of a hard circuit board on which a predetermined circuit pattern is applied, and the optical sensor 41 is conductively connected to the circuit pattern. In addition, although detailed illustration is abbreviate | omitted, the circuit board 42 and the wiring board 24 are electrically connected by wiring members, such as a harness.

  The sensor holder 43 is made of, for example, a black synthetic resin material, and has a substantially cylindrical surrounding portion 45 having a hole 44 for surrounding the optical sensor 41, and a circuit board positioned on the light emitting display 20 side. And a holding portion 46 that holds one side surface P1 of the plate 42.

  Reference numeral 47 denotes a pair of elastic portions having a cantilever shape integrally formed with the sensor holder 43, and a circuit board facing the one side surface P1 at the free ends (tip portions) of the pair of elastic portions 47. Each of the engaging portions 48 is formed of a claw portion that engages with a step portion P3 that is positioned one step lower than the other one side surface P2 of 42. Reference numeral 49 denotes a notch for allowing the threaded portion of the screw S to pass through. The notch 49 is formed at the bottom of the sensor holder 43 so as to correspond to a boss, which will be described later, provided in the housing 50. (See FIG. 5).

  The housing 50 is formed of, for example, a black synthetic resin material, and includes an upper case body 51 and a lower case body 52 both having a substantially concave shape in cross section. The upper case body 51 and the lower case body 52 are In the space 53 which is an internal space to be formed, the light emitting display 20, the reflector 30 (including the concave mirror 31), the external light sensor unit 40 (including the circuit board 42), and the like are accommodated.

  The upper case body 51 is formed with an opening window portion 54 that opens at the upper portion (the windshield 13 side of the vehicle 10) where the concave mirror 31 is disposed. The display light L reflected by the concave mirror 31 is an opening window. It will pass through part 54.

  The upper case body 51 is provided with a translucent cover 55 that is a translucent part so as to close the opening window part 54. The translucent cover 55 is made of a translucent synthetic resin material (for example, acrylic resin), is formed in a curved shape, and serves as a light transmissive member that transmits (passes) the display light L reflected by the concave mirror 31. It has a function. Then, the display light L reflected by the concave mirror 31 is projected onto the windshield 13 through the translucent cover 55, whereby the virtual image V is displayed to the driver 14.

  Reference numeral 56 denotes a light shielding unit for preventing external light such as sunlight from entering the light emitting display 20 through the translucent cover 55 formed in the housing 50. In other words, the light shielding portion 56 includes a light shielding wall for preventing a phenomenon (washout) in which external light is incident on the light emitting display 20 and the virtual image V is difficult to be seen, and from the front wall portion 51 a of the upper case body 51. It is formed so as to hang obliquely. A through-hole 57 having a through-hole shape for guiding external light to the hole 44 is formed in the light shielding part 56 corresponding to the hole 44 of the enclosure 45 provided in the sensor holder 43. Yes.

  Reference numeral 58 denotes a substantially cylindrical boss projecting toward the notch 49 provided on the sensor holder 43. The boss 58 is formed on the light shielding part 56 (upper case body 51). It is provided and has a screw threaded part (not shown) for screwing the threaded part of the screw S.

  When the upper case body 51 (the boss portion 58) and the sensor holder 43 are fixed using the screws S, the detailed illustration is omitted, but first, for example, the penetration portion 57 of the light shielding portion 56 of the surrounding portion 45 is provided. The upper case body 51 and the sensor holder 43 are aligned so as to correspond to the hole 44 and the boss portion 58 corresponds to the notch 49, and then the screw portion of the screw S is notched. 49, and a predetermined portion of the screw portion that passes through the notch 49 is screwed into the screw screw portion, whereby the upper case body 51 (boss portion 58) and the sensor holder 43 are fixed. Is completed.

  Further, the upper case body 51 (housing 50) is provided with a restricting portion 59 formed of a protruding piece for restricting the position of the circuit board 42. The restricting portion 59 is formed so as to hang from the front wall portion 51a of the upper case body 51, and the upper case body 51 (housing 50) and the sensor holder 43 are fixed with the screws S as described above. Accordingly, the other side surface P2 of the circuit board 42 positioned in the direction opposite to the one side surface P1 is configured to come into contact (contact) with the restriction portion 59 formed integrally with the upper case body 51.

  In the state where the one side surface P2 and the restricting portion 59 are in contact with each other, the central axis C1 of the hole 44 provided in the sensor holder 43 substantially coincides with the central axis C2 of the penetrating portion 57 provided in the light shielding portion 56. . As a result, the optical sensor 41 passes through the translucent cover 55 and passes through the through portion 57 provided in the light shielding portion 56 and the hole portion 44 of the surrounding portion 45 provided so as to communicate with the through portion 57. Is detected, and illuminance data is output to the control means.

  Next, the electrical configuration of the display device 12 will be described based on the block diagram shown in FIG. 61 is a speed sensor, and this speed sensor 61 outputs speed data to the control means 62 which is a microcomputer. The control unit 62 includes a CPU 63, a RAM 64, a ROM 65, and the like. The control means 62 is mounted on the wiring board 24, drives the liquid crystal display element 21 via the liquid crystal drive circuit 66, and drives the light source 23 via the light source drive circuit 67. The control means 62 is configured to perform predetermined calculation processing according to a program stored in the ROM 65 based on the illuminance data output from the optical sensor 41 and adjust the light emission luminance of the light source 23 (light emitting display 20). Has been.

  As described above, in the present embodiment, the light emitting display 20 that emits the display light L, the concave mirror 31 that reflects the display light L, and the optical sensor 41 that detects the illuminance of external light and outputs illuminance data are mounted. A circuit board 42, a housing 50 for accommodating at least the concave mirror 31 and the circuit board 42, and a control means 62 for adjusting the light emission luminance of the light emitting display 20 based on the illuminance data. 50), a light shielding portion 56 is formed to prevent external light from entering the light emitting display 20 through a translucent cover 55 formed in the housing 50, and the optical sensor 41 is connected to the circuit board 42 through the sensor holder 43. The sensor holder 43 has a surrounding portion 45 having a hole portion 44 for surrounding the optical sensor 41, and 56 light shielding portions corresponding to the hole portion 44. Is provided with a through-hole 57 for guiding outside light to the hole 44, and the display light L reflected by the concave mirror 31 is projected onto the windshield 13 through the translucent cover 55 to display a virtual image to the driver 14. In the head-up display device that performs the above, the upper case body 51 (housing 50) has a restriction for restricting the position of the circuit board 42 so that the central axis C1 of the hole 44 coincides with the central axis C2 of the through part 57. A portion 59 is provided. The sensor holder 43 has a holding portion 46 that holds one side surface P1 of the circuit board 42, and is opposed to the one side surface P1 by fixing the sensor holder 43 and the upper case body 51 (housing 50). The other side surface P2 of the circuit board 42 is in contact with the restricting portion 59.

  Therefore, the circuit board 42 on which the optical sensor 41 is mounted and the restricting portion 59 formed integrally with the upper case body 51 are used to form the hole 44 and the light shielding portion 56 of the surrounding portion 45 provided in the sensor holder 43. The positional deviation with respect to the provided through portion 57 is prevented, thereby enabling accurate detection of external light without narrowing the detection range of external light by the optical sensor 41, and reducing the detection accuracy of external light by the optical sensor 41. A head-up display device that can be suppressed can be provided.

  In this embodiment, the example in which the display light L emitted from the light emitting display 20 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
13 Windshield (projection member)
14 Driver (observer)
20 Light-emitting display
21 Liquid crystal display elements
23 Light source
30 reflector
31 Concave mirror (reflective member)
40 Outside light sensor unit
41 Optical sensor (external light detection element)
42 Circuit board
43 Sensor holder (holder)
44 holes
45 Siege
46 Holding part
47 Elastic part
48 engaging part
49 Notch
50 housing
51 Upper case body
52 Lower case body
54 Opening window
55 Translucent cover (translucent part)
56 Light shielding part
57 penetration
58 Boss
59 Regulatory Department
62 Control means
C1 Center axis of hole
C2 Center axis of penetration
L Display light
P1 One side
P2 Another aspect
S screw

Claims (2)

A light emitting display that emits display light;
A reflective member for reflecting the display light;
A circuit board provided with an external light detection element for detecting the illuminance of external light and outputting illuminance data;
A housing that houses at least the reflecting member and the circuit board;
Control means for adjusting the light emission luminance of the light emitting display based on the illuminance data,
The housing is formed with a light shielding portion for preventing the outside light from entering the light emitting display through a light transmitting portion formed in the housing.
The external light detection element is disposed on the circuit board through a holder, and the holder has an enclosing portion having a hole for enclosing the external light detection element,
The light shielding portion corresponding to the hole is provided with a through portion for guiding the external light to the hole,
In the head-up display device that projects the display light reflected by the reflecting member onto the projection member through the light transmitting portion and displays a virtual image for an observer,
The head-up display device, wherein the holder is fixed to the light shielding part. The head-up display device according to claim 1, wherein the housing has a restricting portion for restricting a position of the circuit board.

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