Lighting control apparatus for vehicle lamp
First Claim
1. A lighting control apparatus for a vehicle lamp, comprising:
- a light quantity instruction value setup unit that receives information related to a lighting of a light source and sets a light quantity instruction value based on the information;
an energy supply unit that supplies a voltage received from a power source to a low beam semiconductor light source in accordance with the light quantity instruction value, when the light quantity instruction value setup unit receives information for instructing a dimming the low beam semiconductor light source, the light quantity value instruction setup unit sets a first light quantity instruction value, so that a light quantity of the low beam semiconductor light source is gradually reduced to a first light emission level for the reduced lighting of the low beam semiconductor light source, when the light quantity instruction value setup unit receives information indicating that a high beam light source is switched on, the light quantity instruction value setup unit sets a second light quantity instruction value, so that the light quantity of the low beam semiconductor light source is reduced to a second light emission level lower than the first light emission level, and when the light quantity instruction value setup unit receives information indicating that the high beam light source is switched off after the second light quantity instruction value is set, the light quantity instruction value setup unit cancels the second light quantity instruction value and sets a third light quantity instruction value, so that the low beam semiconductor light source is immediately switched on at the first light emission level.
1 Assignment
0 Petitions
Accused Products
Abstract
When the level at an input terminal goes low upon the reception of a signal to dim an LED, a PNP transistor is rendered on and a voltage at the positive input terminal of an operational amplifier is raised, in accordance with a time constant that is defined by a resistor and a capacitor. In accordance with the increase in this voltage, a source current is supplied from the operational amplifier to a current detection terminal, and as the value of the source current is gradually increased, a current flowing across the shunt resistor of the switching regulator is gradually reduced. Further, the light emission level of the LED is gradually lowered from the fully lighted state to the 70% lighted state, and there is, for the LED, a light quantity change of about 30% in ten seconds.
-
Citations
2 Claims
-
1. A lighting control apparatus for a vehicle lamp, comprising:
-
a light quantity instruction value setup unit that receives information related to a lighting of a light source and sets a light quantity instruction value based on the information;
an energy supply unit that supplies a voltage received from a power source to a low beam semiconductor light source in accordance with the light quantity instruction value, when the light quantity instruction value setup unit receives information for instructing a dimming the low beam semiconductor light source, the light quantity value instruction setup unit sets a first light quantity instruction value, so that a light quantity of the low beam semiconductor light source is gradually reduced to a first light emission level for the reduced lighting of the low beam semiconductor light source, when the light quantity instruction value setup unit receives information indicating that a high beam light source is switched on, the light quantity instruction value setup unit sets a second light quantity instruction value, so that the light quantity of the low beam semiconductor light source is reduced to a second light emission level lower than the first light emission level, and when the light quantity instruction value setup unit receives information indicating that the high beam light source is switched off after the second light quantity instruction value is set, the light quantity instruction value setup unit cancels the second light quantity instruction value and sets a third light quantity instruction value, so that the low beam semiconductor light source is immediately switched on at the first light emission level. - View Dependent Claims (2)
-
Specification