VEHICULAR SIGNAL MIRROR

• US 20090067032A1
• Filed: 11/10/2008
• Published: 03/12/2009
• Est. Priority Date: 05/05/1994
• Status: Active Grant

• Current Assignee: Donnelly Corporation (Magna International Incorporated)
• Original Assignee: Donnelly Corporation (Magna International Incorporated)
• Inventors: Habibi, Hamid, Varaprasad, Desaraju V., McCabe, Ian A., Dornan, Craig A., Zhao, Mingtang, Lynam, Niall R.
• Granted Patent: US 7,871,169 B2
• Time in Patent Office: Days
• US Class Current: 359/273
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10293 Edge features, e.g. inserts or holes
• CPC Class Codes: B32B 17/10513 Electrochromic layer
• CPC Class Codes: B60J 3/04 adjustable in transparency
• CPC Class Codes: B60Q 1/2665 on rear-view mirrors lighting devices for vehicle interior on or for rear-view mirrors B60Q3/258
• CPC Class Codes: B60R 1/04 mounted inside vehicle B60R1/025, B60R1/08 take precedence
• CPC Class Codes: B60R 1/082 using a single wide field mirror or an association of rigidly connected mirrors
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: B60R 1/12 Mirror assemblies combined with other articles, e.g. clocks
• CPC Class Codes: B60R 1/1207 with lamps; with turn indicators
• CPC Class Codes: B60R 2001/1215 with information displays
• CPC Class Codes: G02F 1/1516 comprising organic material
• CPC Class Codes: G02F 1/1524 Transition metal compounds
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte

Abstract

A vehicular signal mirror includes a reflective mirror element comprising a mirror reflector on a light-transmitting substrate. The visible light reflectance is at least about 40% for visible light incident upon the front side of the reflective mirror element. A turn signal light display and/or a blind-spot indicator light display is disposed to the rear of the reflective mirror element and configured so that the light emitted by the light display passes through the reflective mirror element to be viewed by a viewer viewing from the front of the reflective mirror element. The light display exhibits, when electrically powered and when operated in the vehicle during day time driving conditions, a display luminance of at least about 60 foot lamberts as measured with the light display placed behind, and emitting light through, the reflective mirror element.

Claims

1. A signal mirror for a vehicle comprising:

a reflective mirror element having a front side and a rear side;

said reflective mirror element comprising a mirror reflector coated onto a light-transmitting substrate;

wherein visible light reflectance by said reflective mirror element is at least about 40% visible light reflectance for visible light incident upon the front side of said reflective mirror element;

wherein said reflective mirror element does not exhibit substantial spectral selectivity in its reflectance of visible light incident upon the front side of said reflective mirror element;

a turn signal light display that emits visible light upon actuation of a turn signal by a driver of a vehicle equipped with said reflective mirror element, said turn signal light display disposed to the rear of the rear side of said reflective mirror element and configured so that said light emitted by said turn signal light display passes through said reflective mirror element to be viewed by a viewer viewing from the front of said reflective mirror element and wherein said turn signal light display exhibits, when electrically powered and when operated in the vehicle during day time driving conditions, a display luminance of at least about 60 foot lamberts as measured with said turn signal light display placed behind, and emitting light through, said reflective mirror element;

a blind-spot indicator light display that emits visible light upon a detection by a blind-spot detector that is part of a vehicle equipped with said blind-spot indicator light display, said blind-spot indicator light display disposed to the rear of the rear side of said reflective mirror element and configured so that said light emitted by said blind-spot indicator light display passes through said reflective mirror element to be viewed by a viewer viewing from the front of said reflective mirror element and wherein said blind-spot indicator light display exhibits, when electrically powered and when operated in the vehicle during day time driving conditions, a display luminance of at least about 60 foot lamberts as measured with said blind-spot indicator light display placed behind, and emitting light through, said reflective mirror element;

wherein said reflective mirror element comprises a vehicular exterior rearview reflective mirror element;

wherein said light-transmitting substrate comprises a glass substrate; and

wherein said turn signal light display comprises at least one light emitting diode and wherein said blind-spot indicator light display comprises at least one light emitting diode.

2. The signal mirror of claim 1, wherein said turn signal light display comprises a plurality of light emitting diodes.

3. The signal mirror of claim 1, wherein said mirror reflector comprises a semitransparent mirror reflector comprising a metal thin film layer and wherein said metal thin film layer comprises silver and has a layer thickness in the range from about 200 angstroms to about 750 angstroms and wherein said metal thin film has a reflectivity of at least about 40% visible light reflectance for visible light incident thereon.

4. The signal mirror of claim 3, wherein said reflective mirror element comprises a rear substrate of an exterior electrochromic mirror, said electrochromic mirror comprising an electrochromic medium.

5. The signal mirror of claim 1, wherein said reflective mirror element comprises a portion of an electrochromic mirror, and wherein said electrochromic mirror comprises an electrochromic medium disposed in a cavity between a front substrate and said reflective mirror element, and wherein said electrochromic medium disposed in said cavity between said front substrate and said reflective mirror element contacts said mirror reflector, and wherein said electrochromic medium comprises at least one of (a) a solid-phase at least partially formed in situ in said cavity by a polymerization reaction and (b) a liquid-phase, and wherein said reflective minor element comprises a large area vehicular exterior rearview reflective mirror element having an area greater than about 140 square centimeters.

6. The signal mirror of claim 1, wherein said mirror reflector comprises at least one of (a) a metal thin film layer, (b) an elemental semiconductor thin film layer and (c) a metal thin film layer combined with a metal oxide thin film layer.

7. The signal mirror of claim 6, wherein said reflective mirror element comprises a large area vehicular exterior rearview reflective mirror element having an area greater than about 140 square centimeters.

8. The signal mirror of claim 7, wherein said reflective mirror element comprises a portion of an electrochromic mirror, and wherein said electrochromic mirror comprises an electrochromic medium disposed in a cavity between a front substantially light transmitting substrate and a rear substrate, said front substantially light transmitting substrate having a front surface, said front substantially light transmitting substrate further having a rear surface that is coated with a transparent electrically conducting layer, said front substantially light transmitting substrate spaced-apart from said rear substrate and wherein said rear substrate comprises said reflective mirror element, and wherein said mirror reflector of said reflective mirror element is disposed on the surface of the rear substrate closest to the transparent electrically conducting coated rear surface of said front substrate and wherein said electrochromic medium disposed in said cavity between said front substrate and said rear substrate comprising said reflective mirror element contacts said mirror reflector, and wherein said electrochromic mirror reflects at least about 55% of visible light incident at said front surface of said front substantially light transmitting substrate when said electrochromic medium is in its bleached state and wherein said electrochromic mirror does not exhibit substantial spectral selectivity in its reflectance of visible light incident at said front surface of said front substantially light transmitting substrate when said electrochromic medium is in its bleached state.