US5504622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for head up display comprising a parabolic reflective mirror
Assignee: Marelli Corp
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Filing: 1994-03-17
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Granted: 1996-04-02
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Expires: 2014-03-17
Abstract
Abstract The present invention provides an apparatus for a head up display for the use of a motor vehicle, which can make a presentation of an image information in a remote place and which can remove a height-wise positional displacement of a double image and distortion of the double image caused by the curved shape of a vehicle front glass to the extent possible. In the apparatus for a head up display for the use of a motor vehicle according to the present invention, a projector (3) has a middle mirror (6) for reflecting an image information (9) such as characters or marks toward a reflective face. The middle mirror (6) includes a portion (18) of the parabolic reflective face which is located away from a main axis of a parabolic mirror. The portion (18) of the parabolic reflective face includes a first curved surface having a small curvature, corresponding to that portion of a vehicle front glass (2) which has a large curvature, and a second curved surface having a large curvature, corresponding t that portion of the vehicle front glass (2) which has a small curvature, so that distortion of the image information due to difference in curvature of the vehicle front glass (2) is corrected and a height-wise positional displacement of a double image, which may occur when the image information is looked through a pair of eyes (10) and (11) of a person riding on the motor vehicle, is corrected.
Inventors
- 👤 Kohki Oikawa
- 👤 Tomonari Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
G; G01; G01D; G01D7/00; G01D7/02; G01D7/04; G01D7/06; B; B60; B60K; B60K35/00; B60K35/20; B60K35/60; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; B60K2360/00; B60K2360/20; B60K2360/33; B60K2360/334; G02B2027/011; G02B2027/0118; G02B2027/012; G02B2027/0121; G02B2027/0129; G02B5/00; G02B5/08; G02B5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
An apparatus for a head up display for use in a motor vehicle, comprising: a curved front glass; a reflective surface formed in said curved front glass; a projector for projecting image information, said image information projected by said projector being reflected on said reflective surface in a direction where said image information is seen by eyes of a person riding in the motor vehicle wherein said image information is presented forwardly of said front glass; and a first mirror mounted on said projector for reflecting said image information toward said reflective surface, said first mirror including a portion of a parabolic reflective face located spaced away from a main axis of a parabolic mirror, wherein said portion of said parabolic reflective face includes a first curved surface having a smaller curvature, corresponding to a portion of said curved front glass which has a larger curvature, and a second curved surface having a larger curvature, corresponding to a portion of said curved front glass which has a smaller curvature.
Claim 2
Independent Claim
169 words
An apparatus for a head up display for use in a motor vehicle, comprising: a curved front glass; a reflective surface formed in said curved front glass; a projector for projecting image information, said image information projected by said projector being reflected on said reflective surface in a direction where said image information is seen by eyes of a person riding in the motor vehicle wherein said image information is presented forwardly of said front glass; and a first mirror mounted on said projector for reflecting said image information toward said reflective surface, said first mirror including a portion of a parabolic reflective face located spaced away from a main axis of a parabolic mirror, wherein said portion of said parabolic reflective face includes a first curved surface having a smaller curvature, corresponding to a portion of said curved front glass which has a larger curvature, and a second curved surface having a larger curvature, corresponding to a portion of said curved front glass which has a smaller curvature.
Claim 3
Dependent Claim
31 words
An apparatus for a head up display for the use in a motor vehicle according to claim 1, further comprising an instrument panel, said projector being disposed inside said instrument panel.
Claim 4
Dependent Claim
24 words
An apparatus for a head up display for the use in a motor vehicle according to claim 1, wherein said reflective surface is semitransparent.
Claim 5
Dependent Claim
24 words
An apparatus for a head up display for the use in a motor vehicle according to claim 2, wherein said reflective surface is semitransparent.
Claim 6
Independent Claim
218 words
An apparatus for a head up display for the use in a motor vehicle, comprising: a curved front glass; a semitransparent reflective surface formed in said front glass; an instrument panel; a projector disposed inside said instrument panel for projecting image information; said image information being reflected on said reflective surface toward eyes of a person riding in the motor vehicle to present an image of said image information forwardly of said front glass in an overlapped relation to a foreground; and a first mirror mounted on said projector for reflecting said image information toward said reflective surface, said first mirror including a portion of a parabolic reflective face which is located away from a main axis of a parabolic mirror; said portion of said parabolic reflective face including a first curved surface having a smaller curvature, corresponding to a portion of said front glass which has a larger curvature, and a second curved surface having a larger curvature, corresponding to a portion of said front glass which has a smaller curvature, wherein distortion of said image information due to differences in curvature of said front glass is corrected and a height-wise positional displacement of a double image, which double image may occur when said image information viewed by a person riding in the motor vehicle, is corrected.
Claim 7
Independent Claim
218 words
An apparatus for a head up display for the use in a motor vehicle, comprising: a curved front glass; a semitransparent reflective surface formed in said front glass; an instrument panel; a projector disposed inside said instrument panel for projecting image information; said image information being reflected on said reflective surface toward eyes of a person riding in the motor vehicle to present an image of said image information forwardly of said front glass in an overlapped relation to a foreground; and a first mirror mounted on said projector for reflecting said image information toward said reflective surface, said first mirror including a portion of a parabolic reflective face which is located away from a main axis of a parabolic mirror; said portion of said parabolic reflective face including a first curved surface having a smaller curvature, corresponding to a portion of said front glass which has a larger curvature, and a second curved surface having a larger curvature, corresponding to a portion of said front glass which has a smaller curvature, wherein distortion of said image information due to differences in curvature of said front glass is corrected and a height-wise positional displacement of a double image, which double image may occur when said image information viewed by a person riding in the motor vehicle, is corrected.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |