JP2007203925A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of preventing lowering of visibility at a lighting time, a light-out time and an illuminance changing time. <P>SOLUTION: This light source device 1 is used in a vehicle cabin. Noise light to bring a probability resonance phenomenon is superimposed on light generated by the light source device 1. Intensity (b) of voltage of noise impressed to generate the noise light is made proportional to the illuminance (a) of the light generated by the light source device 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light source device suitable for being applied to vehicle interiors of passenger cars, trucks, buses and the like.

  Conventionally, a light source device used for an indicator lamp such as a door courtesy lamp for informing a passenger of a vehicle state, an atmosphere illumination lamp in a vehicle interior such as a console illumination, a reading illumination lamp, a meter navigation illumination lamp, etc. Is provided. As described in Patent Document 1, these light source devices are often configured as a so-called illuminated entry system that is comprehensively controlled by electronic control using a computer.

By the way, what is used for atmosphere illumination among such light source devices not only repeats lighting and extinguishing lamps, but also gradually increases the illuminance of light generated during lighting, for example, in order to increase the sense of luxury in the vehicle interior. There are cases where fade-in control, fade-out control that gradually reduces the light generated at the time of extinction, and control in which the illuminance of light generated at the time of steady lighting is in a plurality of stages are applied. Here, lighting means the moment when the voltage applied to the light source device (current if current control) is started up, and steady lighting means that voltage (current if current control) is constantly applied to the light source device. It refers to the state of being applied.
JP 2000-192983 A

  However, in a light source device to which such fade-in control, fade-out control or control with multiple levels of illuminance of generated light is applied, there is a problem that visibility is lowered when the light is turned on, when the light is turned off, or when the illuminance changes. was there.

  In view of the above problems, an object of the present invention is to provide a light source device that can prevent the visibility from being lowered when the lamp is turned on, turned off, or changed in illuminance.

  In order to solve the above problems, a light source device according to the present invention is a light source device used in a vehicle interior, and superimposes noise light that causes a stochastic resonance phenomenon on light generated by the light source device, and The intensity of the light is proportional to the illuminance of the light generated by the light source device.

  Here, the illuminance of the light generated when the lamp is turned on may be gradually increased, and the illuminance of the light generated when the lamp is turned off may be gradually reduced.

  In addition, the illuminance of light generated during steady lighting may be set in a plurality of stages.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that visibility falls at the time of lighting, a light extinction, and the time of illumination intensity change.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. 1, 2 and 3 are explanatory views of the stochastic resonance phenomenon used by the light source device according to the present invention.

  Stochastic resonance (stochastic resonance) is the response of a nonlinear system to a weak input signal below a certain threshold for a certain system represented by a living body such as a human being or an animal, which is enhanced by noise of a certain intensity, It is a phenomenon that enhances the function (especially the sense) of.

  As shown in FIG. 1, a nerve cell of a living body such as a human being or an animal has a threshold type input characteristic. That is, the nerve cell does not respond to an input signal (Input) that is equal to or lower than a certain threshold (Threshold), and an output signal (Output) is not output.

  As shown in FIG. 2, when an input signal (Input) below a threshold value is input to a nerve cell (System), if noise of a certain intensity is input simultaneously, an output signal (Output) is output. . This is a stochastic resonance phenomenon.

  In this case, noise having a certain intensity that is input cannot induce a stochastic resonance phenomenon if the intensity is too large or too small. When the noise intensity (Noise Intensity) and the signal-to-noise ratio (SNR) of the output signal (Output) are shown in a graph, a bell-shaped curve as shown in FIG. 3 is drawn. That is, noise having a noise intensity in the vicinity of A where the bell-shaped curve has a peak value is noise having a certain intensity that induces a stochastic resonance phenomenon.

  In the light source device according to the present invention, by applying noise light that causes the stochastic resonance phenomenon to the light generated by using such a stochastic resonance phenomenon, the flow stimulation contained in the generated light is increased, thereby increasing the nerve of the living body. By enhancing the function of the cell, especially vision, which is one of the senses, and changing the intensity of noise light that causes a stochastic resonance phenomenon according to the illuminance of light generated by the light source device, When the illuminance changes, the intensity of the noise light with respect to the illuminance of the light generated by the light source device becomes too large, and on the contrary, the signal-to-noise ratio becomes too small, reducing the visibility of the light generated by the light source device in the passenger compartment. Is prevented.

  That is, in the light source device 1 provided in the vehicle compartment as shown in FIG. 4, noise light that causes a stochastic resonance phenomenon is superimposed on the light generated in the bulb 2 (which may be an LED). Then, white noise) is superimposed. In FIG. 4, reference numeral 3 denotes a power supply device (computer that controls each light source device).

  Specifically, as shown in FIG. 5A, a voltage waveform (current waveform in the case of current control) input to a bulb 2 or a light emitting body such as an LED constituting the light source device is shown in FIG. 5B. Noise as shown is superimposed and input to the light bulb 2 shown in FIG. 4 as a voltage waveform as shown in FIG. For these reasons, the illuminance of light emitted from the light bulb 2 in FIG. 4 has a waveform as shown in FIG.

  In addition to this, the intensity of the noise light that causes the stochastic resonance phenomenon is changed according to the illuminance of the light generated by the light source device 1. Here, since the light source device is voltage controlled, as shown in FIG. 6, the amplitude b of the noise voltage that determines the intensity of the noise light is input to the bulb 2 that determines the illuminance of the light generated by the light source device 1. The value is proportional to the voltage a. That is, b = ka (k is a constant).

  That is, as shown in FIG. 6, when performing fade-in control that gradually increases the illuminance of light generated during lighting α, and fade-out control that gradually decreases the illuminance of light generated during light extinction γ. The amplitude b of the noise voltage applied to generate the noise light that causes the stochastic resonance phenomenon is proportional to the voltage a input to the bulb 2 of the light source device 1.

  According to this, by applying noise light that brings about a stochastic resonance phenomenon to the light generated by the light source device 1 and increasing the flow stimulus contained in the light generated by the bulb 2, the function of the nerve cells of the living body, in particular By increasing the intensity of noise light that enhances visual perception, which causes a stochastic resonance phenomenon, according to the illuminance of light generated by the bulb 2 of the light source device 1, The intensity of the noise light with respect to the illuminance of the light generated by the bulb 2 of the light source device 1 becomes too large, and on the contrary, the signal-to-noise ratio becomes too small, and the visibility of the light generated by the light source device in the passenger compartment decreases. Can be prevented.

  In addition to this, even when the illuminance during steady lighting β shown in FIG. 6 is set at a plurality of stages for each timing, the noise light that causes the stochastic resonance phenomenon according to the illuminance of the light generated by the light source device 1 Change the intensity. Again, since the light source device is voltage controlled, the amplitude b of the noise voltage that determines the intensity of the noise light is set to a value proportional to the voltage a that is input to the bulb 2 that determines the illuminance of the light source device 1. That is, b = ka (k is a constant).

  Also by this, by applying noise light that causes a stochastic resonance phenomenon to the light generated by the light source device 1 and increasing the flow stimulus contained in the light generated by the bulb 2, the function of the nerve cells of the living body, in particular, the sense The bulb of the light source device 1 at steady lighting β is changed by increasing the intensity of noise light that enhances the visual perception and causing the stochastic resonance phenomenon according to the illuminance of the light generated by the bulb 2 of the light source device 1. The intensity of the noise light with respect to the illuminance of the light generated by 2 is prevented from becoming too high, and the signal-to-noise ratio becomes too small, thereby preventing the visibility of the light generated by the light source device in the passenger compartment from being lowered. can do.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  The present invention relates to a light source device that uses a stochastic resonance phenomenon to improve the visibility of a driver, and its effect can be obtained by changing and adding a relatively minor device, such as passenger cars, trucks, buses, etc. It can be applied to various vehicles.

It is a schematic diagram explaining the stochastic resonance phenomenon which the light source device by this invention utilizes. It is a schematic diagram explaining the stochastic resonance phenomenon which the light source device by this invention utilizes. It is a schematic diagram explaining the stochastic resonance phenomenon which the light source device by this invention utilizes. It is a schematic diagram which shows one Example of the light source device by this invention. It is a schematic diagram which shows one Example of the light source device by this invention. It is a schematic diagram which shows one Example of the light source device by this invention.

Explanation of symbols

1 Light source device 2 Bulb 3 Power supply device

Claims (3)

  A light source device used in a vehicle interior, wherein noise light that causes a stochastic resonance phenomenon is superimposed on light generated by the light source device, and the intensity of the noise light is proportional to the illuminance of light generated by the light source device. A light source device characterized by the above.   2. The light source device according to claim 1, wherein the illuminance of light generated during lighting is gradually increased, and the illuminance of light generated during light extinction is gradually reduced.   The light source device according to claim 1, wherein the illuminance of light generated during steady lighting is set in a plurality of stages.

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