Illuminant display device and motor license plate using same
First Claim
1. For a vehicle with a power supply circuit, headlamps, parking lamps and a switch for connecting the headlamps and parking lamps to the power supply circuit, an illuminant license plate device comprising:
- a license plate of an opaque material having perforations in the shape of identifying characters;
a light source located inward of said license plate for projecting light toward said translucent pieces;
switch means in the power supply circuit for energizing the light source;
a delay circuit in the power supply circuit to maintain the switch means to the light source in a closed state for a predetermined time period after said headlight or parking light has been turned off; and
a light distributor plate interposed between said light source and said license plate and having a transparent masking sheet adhered to a position opposite said light source, said masking sheet having a density increasing in degree from peripheral portions toward the center thereof to distribute the light uniformly from said light source before transmission through said translucent pieces in said license plate;
said delay circuit including a capacitor and a resistor in parallel with each other;
said delay circuit further including a switching element operable in relation to the terminal voltage of said capacitor to control opening and closing of said power supply circuit of said light source;
said translucent pieces being heat pressed to the license plate at the perforations for securing the pieces in the plate.
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Accused Products
Abstract
The disclosed illuminant display device is to be used on a motor vehicle for publicity or other purposes. In the device an opaque plate member contains perforations in the shape of a character or figure to be displayed, and tinted translucent pieces are set in the perforations transmit light which is projected from a light source provided behind the perforated plate. The display device can serve as an illuminant license plate which is arranged to illuminate the identifying characters continuously for a predetermined time period after the headlight or parking light of the motor vehicle has been turned off and thereby foil a driver who tries to conceal the identity of the vehicle by turning off the lights for hit-and-run or other unlawful purposes.
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Citations
4 Claims
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1. For a vehicle with a power supply circuit, headlamps, parking lamps and a switch for connecting the headlamps and parking lamps to the power supply circuit, an illuminant license plate device comprising:
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a license plate of an opaque material having perforations in the shape of identifying characters; a light source located inward of said license plate for projecting light toward said translucent pieces; switch means in the power supply circuit for energizing the light source; a delay circuit in the power supply circuit to maintain the switch means to the light source in a closed state for a predetermined time period after said headlight or parking light has been turned off; and a light distributor plate interposed between said light source and said license plate and having a transparent masking sheet adhered to a position opposite said light source, said masking sheet having a density increasing in degree from peripheral portions toward the center thereof to distribute the light uniformly from said light source before transmission through said translucent pieces in said license plate; said delay circuit including a capacitor and a resistor in parallel with each other; said delay circuit further including a switching element operable in relation to the terminal voltage of said capacitor to control opening and closing of said power supply circuit of said light source; said translucent pieces being heat pressed to the license plate at the perforations for securing the pieces in the plate. - View Dependent Claims (2, 3, 4)
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Specification