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Lighting unit and head-up display

A lighting unit and a technology for displaying images, applied to lighting devices, parts of lighting devices, projection devices, etc., can solve the problems of particularly significant reduction in illuminance, reduction in brightness, uneven illuminance of lighting units, etc.

Active Publication Date: 2020-10-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if the relative position of the light source deviates greatly from the ideal desired position in design with respect to the optical axis of such a primary lens, the illuminance unevenness and illuminance reduction of the lighting unit may become particularly noticeable.
In addition, in such a case, if the lighting object of the lighting unit is the HUD device as described above, there is a possibility that brightness unevenness and brightness reduction may easily occur in the virtual image of the displayed image.

Method used

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  • Lighting unit and head-up display
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  • Lighting unit and head-up display

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0027] like figure 1 As shown, the HUD device 1 according to the first embodiment of the present disclosure is mounted on a vehicle 8 which is a mobile body, and is accommodated inside an instrument panel 80 . The HUD device 1 projects and displays an image 10 onto a windshield 81 which is a projection means of the vehicle 8 . As a result, in the interior of the vehicle 8 , the light of the displayed image 10 reflected by the windshield 81 reaches the eyepoint 90 of the viewer 9 . The viewer 9 senses the arrival light toward the eye point 90 and visually recognizes the virtual image 10 a of the display image 10 in front of the windshield 81 . At this time, the visual recognition of the virtual image 10 a is limited to the case where the eye point 90 is located in a predetermined visual recognition area 91 inside the vehicle 8 . In other words, when the eye point 90 deviates from the visual recognition area 91 , it is difficult for the viewer 9 to visually recognize the virtu...

no. 2 approach

[0069] like Figure 5 , Image 6 As shown, the second embodiment of the present disclosure is a modified example of the first embodiment. In the lighting unit 2002 of the second embodiment, the structure of the first-stage lens 2022 in the condenser lens 2021 of each group of lighting units 2026 is different from that of the first embodiment.

[0070] Specifically, the first-stage lens 2022 of each group of lighting units 2026 is independently formed with a first-stage lens surface 2220 that imparts the largest positive power among the same group of condensing lenses 2021 on the side of the same group of light sources 20 . In addition, the first-stage lenses 2022 of each group of lighting units 2026 are independently formed on the side of the same group of light sources 20 with a concave portion that uses the first-stage lens surface 2220 as a concave bottom surface and communicates the internal auxiliary space portion 2223a with the receiving space portion 221a. 2223.

[0...

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Abstract

The lighting unit (2) includes a light source (20) that radiates light, a substrate (281) on which the light source is mounted, and multistage condenser lenses (21, 22, 24) that condense the radiated light from the light source. The first stage lens (22) which is the closest to the light source and given the maximum positive power among the multistage condenser lenses has a partition wall part (221) and a positioning part (222). The partition wall (221) protrudes toward the substrate side to partition a housing space (221a) for housing the light source in the range (R) from the combined focal point (Pc) of the multi-stage condenser lens to the first-stage lens. The positioning part (222) is provided on the partition wall part, and is positioned on the substrate by concave-convex fitting.

Description

[0001] Cross References to Related Applications [0002] This application is based on the JP Patent application 2016-158318 for which it applied on August 11, 2016, The description content is used here. technical field [0003] The present disclosure relates to a lighting unit and a head-up display device provided with the lighting unit. Background technique [0004] Conventionally, a head-up display device (hereinafter referred to as "HUD device") is known that projects a display image formed by a display unit onto a projection unit to display a visually recognizable virtual image of the display image in a visually recognizable area. [0005] In such a HUD device, an illumination unit having a structure disclosed in Patent Document 1 is used as an illumination unit suitable for causing a display image to emit light by transmissive illumination of the display unit, for example. In this lighting unit, a multistage condensing lens is provided to condense the radiated light em...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21V17/00B60K35/00F21S2/00F21V5/04G02B27/01F21Y115/10
CPCB60K35/00F21S2/00F21V5/04F21V17/00G02B27/01G02B19/0014G02B27/0101G02B19/0061G02B19/0066G02B19/0028G02B3/0056F21S41/143G02B2027/0118B60K2360/334G02B2027/013G03B21/2033
Inventor 南原孝启
Owner DENSO CORP