EP0146672A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Drive apparatus for a liquid crystal dazzle free mirror arrangement
Assignee: Denso Corp
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Filing: 1984-06-14
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Granted: —
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Expires: 2004-06-14
Abstract
Abstract A drive apparatus for a liquid crystal dazzlement preventing mirror arrangement (80) for automatically setting a liquid crystal panel of the mirror arrangement (80) to a dazzlement preventing state by detecting illuminance on the mirror surface and brightness in region near the mirror. An incident light detecting unit (4) detects incident light onto the mirror. An ambient light detecting unit (5) detects brightness in a region around the mirror. A control unit (6) receives both the incident light and the ambient light signals and produces a control signal for driving the liquid crystal panel through a drive unit (7). The apparatus includes an illuminance descri- mination function, which is performed in such a manner that in the event of the illuminance on the mirror surface is higher than first prescribed set value of incident light illuminance and the illuminance in region around the mirror is lower than a prescribed set value of ambient light illuminance, the dazzlement preventing state is provided, and that in the event of the incident light illuminance is higher than a second prescribed set value of incident light illuminance which is higher than that of the first set value, irrespective of the ambient light illuminance, the dazzlement preventing state is also provided.
Inventors
- 👤 Hiroshi Itoh
- 👤 Shinya Ohmi
- 👤 Yasutoshi Suzuki
- 👤 Tsuyoshi Fukuda
- 👤 Kunihiro Hara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
B; B60; B60R; B60R1/00; B60R1/02; B60R1/08; B60R1/083; B60R1/088
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
1 . A drive apparatus for a liquid crystal type dazzlement preventing mirror arrangement comprising: an incident light detecting means for detecting light incident onto the reflecting mirror arrangement and providing an incident light signal indicative of the brightness thereof; an ambient light detecting means for detecting an ambient light level in a region around the mirror arrangement and providing an ambient light signal indicative of the brightness thereof; a control means, responsive to said incident and ambient light signals, for providing a control signal for causing mirror arrangement dazzlement state operation only when the brightness of said incident light is greater than a predetermined incident light level and the brightness of said ambient light is less than a predetermined ambient light level; and a drive means for causing said mirror arrangement to operate in a dazzlement preventing state in response to said control signal.
Claim 2
Dependent Claim
145 words
1 . A drive apparatus for a liquid crystal type dazzlement preventing mirror arrangement comprising: an incident light detecting means for detecting light incident onto the reflecting mirror arrangement and providing an incident light signal indicative of the brightness thereof; an ambient light detecting means for detecting an ambient light level in a region around the mirror arrangement and providing an ambient light signal indicative of the brightness thereof; a control means, responsive to said incident and ambient light signals, for providing a control signal for causing mirror arrangement dazzlement state operation only when the brightness of said incident light is greater than a predetermined incident light level and the brightness of said ambient light is less than a predetermined ambient light level; and a drive means for causing said mirror arrangement to operate in a dazzlement preventing state in response to said control signal.
Claim 3
Dependent Claim
174 words
A drive apparatus for a liquid crystal type dazzlement preventing mirror arrangement comprising: an incident light detecting means for detecting light incident onto the reflecting mirror arrangement and providing an incident light signal indicative of the brightness thereof; an ambient light detecting means for detecting an ambient light level in a region arround the mirror arrangement and providing an ambient light signal indicative of the brightness thereof; a control means, responsive to said incident and ambient light signals, for providing a control signal for causing mirror arrangement dazzlement state operation when either the brightness of said incident light is greater than a first predetermined incident light level and the brightness of said ambient light is less than a predetermined ambient light level or the brightness of said incident light is greater than a second predetermined incident light level which is greater than the first predetermined incident light level regardless of ambient light; and a drive means for causing said mirror arrangement to operate in a dazzlement preventing state in response to said control signal.
Claim 4
Dependent Claim
174 words
A drive apparatus for a liquid crystal type dazzlement preventing mirror arrangement comprising: an incident light detecting means for detecting light incident onto the reflecting mirror arrangement and providing an incident light signal indicative of the brightness thereof; an ambient light detecting means for detecting an ambient light level in a region arround the mirror arrangement and providing an ambient light signal indicative of the brightness thereof; a control means, responsive to said incident and ambient light signals, for providing a control signal for causing mirror arrangement dazzlement state operation when either the brightness of said incident light is greater than a first predetermined incident light level and the brightness of said ambient light is less than a predetermined ambient light level or the brightness of said incident light is greater than a second predetermined incident light level which is greater than the first predetermined incident light level regardless of ambient light; and a drive means for causing said mirror arrangement to operate in a dazzlement preventing state in response to said control signal.
Claim 5
Dependent Claim
20 words
A drive apparatus according to claim 1, wherein said mirror arrangement includes a mirror as a light reflecting element thereof.
Claim 6
Dependent Claim
17 words
A drive apparatus according to claim 1, wherein said incident and ambient light signals are electric signals.
Claim 7
Dependent Claim
24 words
A drive apparatus according to claim 1, wherein said drive means applies an electric field to a liquid crystal panel of the mirror arrangement.
Claim 8
Dependent Claim
88 words
A drive apparatus according to claim 1, wherein said mirror arrangement includes a mirror element, a pair of parallel substrates at least one of said substrates being disposed at a light incident side of said arrangement and made of glass, a pair of electrodes installed on an inner end surface of each substrate respectively, and a liquid crystal element interposed between said substrates, an outer end surface of the substrate disposed at the light' incident side among said pair of substrates being covered by a transparent plastic film.
Claim 9
Dependent Claim
18 words
A drive apparatus as according to claim 6, wherein said transparent plastic film contains an ultraviolet absorbing agent.
Claim 10
Dependent Claim
26 words
A drive apparatus according to claim 6, wherein said transparent plastic film is covered at least on one end surface thereof by an ultraviolet absorbing agent.
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DE2416172A1
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GB1574674A
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GB2029343A
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DE3041692A1
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FR2513198A1
Cited
GB2119087A
Cited
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