Headup display apparatus
First Claim
1. A headup display apparatus comprising:
- an illuminating type indicator for emitting display light in a visible wavelength range;
a single off-axis reflective hologram for reflecting the display light from the indicator in a predetermined direction, said off-axis reflective hologram being fixed and non-pivoting and having a reflection surface that reflects incident external light coming in a direction reverse to the path of the display light toward a direction different from that of the visible display light of the indicator; and
a reflection member arranged in a viewing field of a driver, said reflection member having an appropriate reflection factor, said reflection member reflecting the real display image from the off-axis reflective hologram toward the eye position of the driver so that a virtual image of the display formed by the display light reflected by the reflection member is superimposed on an exterior view seen through the reflection member, wherein said off-axis reflective hologram is disposed in close proximity to said illumination type indicator to eliminate chromatic aberration.
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Accused Products
Abstract
A headup display apparatus consists of a projection optical system unit installed in the dashboard of a car and a reflection member on the windshield. The projection optical system unit contains an indicator and an off-axis reflective hologram which reflects display light of the indicator toward the windshield, which in turn reflects it toward the viewing point of a driver. As a result, the display is seen superimposed on the exterior view. When external light as from the sun enters the projection optical system unit traveling in a direction reverse to the path of the display light, the off-axis reflective hologram reflects the incident external light toward a direction different from that of the outgoing display light to minimize an abnormal illumination of the indicator surface which would otherwise render the display unrecognizable. Behind the hologram is installed a heat dissipating member that receives infrared rays that have transmitted the hologram in order to dissipate heat.
53 Citations
17 Claims
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1. A headup display apparatus comprising:
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an illuminating type indicator for emitting display light in a visible wavelength range; a single off-axis reflective hologram for reflecting the display light from the indicator in a predetermined direction, said off-axis reflective hologram being fixed and non-pivoting and having a reflection surface that reflects incident external light coming in a direction reverse to the path of the display light toward a direction different from that of the visible display light of the indicator; and a reflection member arranged in a viewing field of a driver, said reflection member having an appropriate reflection factor, said reflection member reflecting the real display image from the off-axis reflective hologram toward the eye position of the driver so that a virtual image of the display formed by the display light reflected by the reflection member is superimposed on an exterior view seen through the reflection member, wherein said off-axis reflective hologram is disposed in close proximity to said illumination type indicator to eliminate chromatic aberration. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. A headup display apparatus comprising:
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an illuminating type indicator for emitting display light in a visible wavelength range; a single off-axis reflective hologram for reflecting the display light from the indicator in a predetermined direction, said off-axis reflective hologram being fixed and non-pivoting and having a reflection surface that reflects incident external light coming in a direction reverse to the path of the display light toward a direction different from that of the visible display light of the indicator; an optical system for forming a real image of the indicator on the off-axis reflective hologram to eliminate chromatic aberration; and a reflection member arranged in a viewing field of a driver, said reflection member having an appropriate reflection factor, said reflection member reflecting the display light from the off-axis reflective hologram toward the eye position of the driver so that a virtual image of the display formed by the display light reflected by the reflection member is superimposed on an exterior view seen through the reflection member.
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3. A headup display apparatus comprising:
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an illuminating type indicator for emitting display light in a visible wavelength range; a single prism having a reflection film on a surface thereof on the opposite side of the indicator, said reflection film having a wavelength selectivity suitable for reflecting only the display light, another surface of said prism on the side of the indicator is formed as a surface for reflecting the display light from the indicator in a predetermined direction, said reflection surface of the prism being fixed and non-pivoting and reflecting incident external light coming in a direction reverse to the path of the display light toward a direction different from that of the visible display light of the indicator; and a reflection member arranged in a viewing field of a driver, said reflection member having an appropriate reflection factor, said reflection member reflecting the display light from the prism toward the eye position of the driver so that a virtual image of the display formed by the display light reflected by the reflection member is superimposed on an exterior view seen through the reflection member. - View Dependent Claims (17)
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Specification