HEAD-UP DISPLAY DEVICE

• US 20140204465A1
• Filed: 01/21/2014
• Published: 07/24/2014
• Est. Priority Date: 01/22/2013
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yamaguchi, Masayuki
• Application Number:
  US14/159,545
• Publication Number:
  US 20140204465A1
• Time in Patent Office: Days
• US Class Current: 359/633
• CPC Class Codes: G02B 2027/015 involving arrangement aiming to get less bulky devices
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence

Abstract

A head-up display device includes a projector, a screen component and a prism component. The prism component integrally has an incidence surface into which laser light enters from the projector, a mirror surface which reflects the laser light entering inside the prism component from the incidence surface, and an exit surface which emits the laser light reflected by the mirror surface toward the screen component outside of the prism component, as optical surface on an optical path, and each of the incidence surface and the exit surface constructs a lens surface such that that the laser light is formed into an image relative to the screen component in a spot state.

Claims

1. A head-up display device that projects a display picture on a projection surface of a movable unit to display a virtual image of the display picture which is seen from an interior of the movable unit, the head-up display device comprising:

a projector which projects laser light;

a screen component which produces the display picture to be projected on the projection surface by irradiating the laser light; and

a prism component disposed on an optical path between the projector and the screen component, the prism component introducing and irradiating the laser light projected from the projector to the screen component, wherein

the prism component has a refractive index which is higher than that of air, and integrally has

an incidence surface which the laser light enters from the projector,

a mirror surface which reflects the laser light entering inside the prism component from the incidence surface, and

an exit surface which emits the laser light reflected by the mirror surface toward the screen component outside of the prism component, as optical surface on the optical path, and

each of the incidence surface and the exit surface constructs a lens surface such that that the laser light is formed into an image relative to the screen component in a spot state.

2. The head-up display device according to claim 1, wherein

a numerical aperture between the projector and the screen component is defined as NA,

a projection diameter of the laser light projected by the projector is defined as φ

,

an actual distance between the projector and the screen component is defined as D,

an actual distance between the incidence surface and the exit surface via the mirror surface inside of the prism component is defined as t,

a refractive index of the prism component is defined as n, and

a relationship of NA=φ

/{2D−

2t·

(1−

1/n)} is satisfied.

the prism component has an attachment part to be attached to the movable unit, and

the attachment part is formed at a portion of the prism component other than the optical surface.