FR2242695A1 - Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror - Google Patents

Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror

Info

Publication number
FR2242695A1
FR2242695A1 FR7332003A FR7332003A FR2242695A1 FR 2242695 A1 FR2242695 A1 FR 2242695A1 FR 7332003 A FR7332003 A FR 7332003A FR 7332003 A FR7332003 A FR 7332003A FR 2242695 A1 FR2242695 A1 FR 2242695A1
Authority
FR
France
Prior art keywords
parabolic mirror
mirror
tachometer
projection system
centre
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7332003A
Other languages
French (fr)
Other versions
FR2242695B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jaeger SA
Original Assignee
Jaeger SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jaeger SA filed Critical Jaeger SA
Priority to FR7332003A priority Critical patent/FR2242695A1/en
Publication of FR2242695A1 publication Critical patent/FR2242695A1/en
Application granted granted Critical
Publication of FR2242695B1 publication Critical patent/FR2242695B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)

Abstract

The projection system employes a parabolic mirror (3) which is located so that the tachometer face (2) is at its centre. The light rays impinging on the mirror surface and originating at the mirror centre are reflected parallel to the axis of symmetry of the parabola, onto the transparent front surface (1) of the vehicle instrument panel, which deflects then towards the driver. Alternatively a small plane mirror may be located adjacent the tachometer face (2) so that the light rays from the latter are directed onto the parabolic mirror (3) and appear to have come from a real image of the tachometer face at the centre of the parabolic mirror (3).
FR7332003A 1973-09-05 1973-09-05 Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror Granted FR2242695A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7332003A FR2242695A1 (en) 1973-09-05 1973-09-05 Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7332003A FR2242695A1 (en) 1973-09-05 1973-09-05 Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror

Publications (2)

Publication Number Publication Date
FR2242695A1 true FR2242695A1 (en) 1975-03-28
FR2242695B1 FR2242695B1 (en) 1976-10-01

Family

ID=9124646

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7332003A Granted FR2242695A1 (en) 1973-09-05 1973-09-05 Projection system for vehicle tachometer - reading is placed at apparent focus of a parabolic mirror

Country Status (1)

Country Link
FR (1) FR2242695A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294515A (en) * 1979-03-23 1981-10-13 Arthur Kaufman Virtual image display apparatus
US4978196A (en) * 1987-04-15 1990-12-18 Yazaki Corporation Display apparatus for a vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294515A (en) * 1979-03-23 1981-10-13 Arthur Kaufman Virtual image display apparatus
US4978196A (en) * 1987-04-15 1990-12-18 Yazaki Corporation Display apparatus for a vehicle

Also Published As

Publication number Publication date
FR2242695B1 (en) 1976-10-01

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Legal Events

Date Code Title Description
ST Notification of lapse