Illumination – Supported by vehicle structure – Housing
Reexamination Certificate
1999-02-25
2001-04-24
Cariaso, Alan (Department: 2875)
Illumination
Supported by vehicle structure
Housing
C362S546000, C362S294000, C362S373000
Reexamination Certificate
active
06220739
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel vehicular light fixture, and, more particularly, to a technology for preventing dew condensation on inner surfaces of a lens.
In such vehicular headlight
1
′, the lamp body
2
′ is made of a synthetic resin to be substantially uniform in thickness thereover.
Such conventional vehicular headlight has presented a problem that when air temperature in the light chamber
4
′ drops, dew condensation is liable to occur on inner surfaces of the lens
3
′.
When dew condensation has occurred on the inner surfaces of the lens
3
′, water droplets adhering to the inner surfaces of the lens
3
′ will cause light from a light source to be refracted to create glare, and the inner surfaces of the lens
3
′ will become dirty or bad in appearance, disadvantageously.
In this respect, the present invention aims at making dew condensation hard to occur on inner surfaces of a lens.
SUMMARY OF THE INVENTION
To solve the above problem, a vehicular light fixture according to the present invention is constructed such that a lamp body is made of a synthetic resin and formed at a part thereof with bent zones, other portions of the lamp body other than the bent zones have a substantially uniform wall thickness, and the bent zones have a smaller wall thickness than that of the other portions of the lamp body other than the bent zones.
Accordingly, in the case where, for example, moisture in a light chamber is as great as causing dew condensation and temperature in the light chamber drops in the event of a shift from a lighting mode to a putting-out mode, thin walled bent zones first drops in temperature to cause dew condensation on the bent zones having thus dropped in temperature, so that dew condensation is hard to occur on inner surfaces of a lens.
Also, the bent zones are bent while being thin-walled, so that they will not be reduced in strength.
An embodiment of a vehicular light fixture according to the invention will be described below with reference to the accompanying drawings. In addition, the embodiment shown is an application of the invention to a vehicular headlight.
REFERENCES:
patent: 4862337 (1989-08-01), Ohshio et al.
patent: 5497308 (1996-03-01), Ohtsuka et al.
patent: 5562337 (1996-10-01), Takinami et al.
patent: 5743630 (1998-04-01), Yanagihara et al.
patent: 31 06 319 (1987-11-01), None
patent: 42 34 919 (1994-11-01), None
Harada Tatsuhiko
Nakamura Yasuhiro
Cariaso Alan
DelGizzi Ronald E.
Koito Manufacturing Co. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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