Title:
LIGHT OPERATED SWITCH
Document Type and Number:
WIPO Patent Application WO/1993/010550
Kind Code:
A1
Abstract:
The invention provides a light operated switch which, in a first embodiment, is provided for a vehicle warning light arrangement (10). The switch includes a light sensitive sensor, e.g. a light sensitive diode or resistor (12) which supplies an electrical signal proportional to a sensed light value to enable a switch (14) for use in switching the system on or off by connection to a battery (18). Switching means (16) receives the signal from the sensor and supplies it to a comparator (24) where it is compared with a pre-determined value stored therein. If the value is exceeded a second switch (26) is operated to actuate light array (20, 22). A timing unit (28) preferably measures the time period for which the measured light value exceeds the pre-determined value, where the duration of this exceeds a pre-determined period, the pre-determined value stored in the comparator (24) is adjusted to compensate. The light operated switch may also be incorporated in a toy or safety device.
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Inventors:
HAMAR LASZLO (GB)
Application Number:
PCT/GB1992/002150
Publication Date:
May 27, 1993
Filing Date:
November 20, 1992
Export Citation:
Assignee:
HAMAR LASZLO (GB)
International Classes:
B60Q1/14; B60Q9/00; H03K17/30; H03K17/795; H05B37/02; (IPC1-7): B60Q1/26; H01H35/00; H03K17/78; H05B37/02
Foreign References:
| US4249160A | 1981-02-03 | |||
| EP0072406A2 | 1983-02-23 | |||
| DE2527877B2 | 1977-08-04 | |||
| DD209152A1 | 1984-04-25 | |||
| US4665321A | 1987-05-12 | |||
| GB2231274A | 1990-11-14 |
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