Electric lamp and discharge devices: systems – With radiant energy sensitive control means
Patent
1999-10-29
2000-12-12
Vu, David
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
315151, 315157, 340540, H05B 3700
Patent
active
061603511
ABSTRACT:
An illumination control apparatus for controlling illumination by detecting a change in an environment is provided. The illumination control apparatus includes a magnetic field detector for detecting a change in a magnetic field generated by a magnetized ferroelectric object to output a first signal having a voltage which is proportional to the change in the magnetic field; an amplifier for amplifying the first signal; a discriminator for discriminating a level of the amplified voltage to output an illumination on-signal having a first logic level if the level of the amplified voltage is higher than a predetermined voltage, and otherwise to output an illumination off-signal having a second logic level; an illumination controller for outputting an illumination driving voltage in response to the illumination on-signal having the first logic level; and an illumination portion for producing light in response to the illumination driving voltage. Thus, the illumination control apparatus can turn illumination on/off by detecting the approach of a key in any locking system for use in, for example, the front door of a house, cars or office supplies, which requires that the key made of a ferroelectric material is magnetized. Also, the illumination control apparatus can control illumination in response to a specific action of a user and can be easily installed in a limited space.
REFERENCES:
patent: 4901053 (1990-02-01), Kukamachi et al.
Han Sung-hoo
Kang Sang-ug
Samsung Electronics Co,. Ltd.
Vu David
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