JPS5817934B2 - Irradiation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to create a practical irradiation device having an arbitrary spectral distribution.

Here, for ease of explanation, an example in which standard light D65 is produced will be described.

Conventionally, when a spectral distribution including near ultraviolet (uV-A) is given, such as D65, the following two methods are used to create a light source that approximates the spectral distribution.

The first method uses a light source with a continuous spectral distribution from the near-ultraviolet region to the near-infrared region, such as a xenon lamp, and combines it with a filter with specific spectral transmission characteristics to create a light source with a spectral distribution close to the required one. That's what you're trying to get.

The second method attempts to obtain a light source close to the required spectral distribution by using a combination of a plurality of different spectral distributions, such as ultraviolet lamps, fluorescent lamps, and light bulbs.

The problem with the first method is that it is difficult to determine the filter to be combined with the light source, so it is necessary to repeat the process by trial and error.

In addition, the disadvantage of the second method is that the spectral distribution of each type of light source is determined, so even if they are combined, it is difficult to match the required spectral distribution.
This means that only a limited number of combinations are possible.

The present invention was made to eliminate the above problems, and includes a light source with a continuous spectral distribution from the near-ultraviolet region to the near-infrared region;
For example, by passing the light from a xenon lamp through a group of filters, multiple light sources with different spectral distributions (several filters) are placed, and a reflecting mirror is used to focus the light onto the irradiation surface. It is possible to create a spectral distribution different from that of the initial light source.

Further, by changing the amount of light passing through the filter and the filter, the spectral distribution of light that gathers on the irradiation surface can be easily adjusted and changed.

An example will be explained below based on the drawings.

FIG. 1 is a conceptual diagram based on the present invention.

When filter groups F1 to Fn are arranged around a light source and a reflecting mirror R is arranged around them, the light from the light source passes through the filter groups F1 to Fn, so that each light source has a different light distribution. The lights A1 to An are collected on the irradiation surface P by the reflecting mirror R.

At this time, the amount of light B collected on the irradiation surface P has a wavelength of 300 m.
m~800.

Moreover, the spectral distribution Bλ of the irradiation surface P at the wavelength λ is is required.

FIGS. 2 and 3 are cross-sectional views optically explaining how the spectral distribution of light on the irradiation surface P changes according to the present invention. - When the distance to F2 is 4+12, filter F1. If the positional relationship between F2 and reflector R is constant,
The amount of light passing through the filters F1 and F2 is proportional to the solid angles θ1 and θ2 formed by the light source and the filters F1 and F2.

Therefore, the spectral distribution of light that gathers on the irradiation surface P that can be created by the positional relationship shown in Figure 2, the light source, and the filters F1 and F
The spectral distribution of the light converging on the irradiation surface P that can be created will differ depending on the positional relationship (FIG. 3) in which only the distance from P is changed.

As is clear from the above explanation, according to the present invention,
(1) If the positional relationship between the filter groups F1 to Fn, the reflector R, and the irradiation surface P is maintained constant, the spectral distribution of the light that gathers on the irradiation surface P will be the solid angle θ1 created by the light source and the filter groups F1 to Fn. ~θ.

It can be changed by changing .

Therefore, (2) the spectral distribution of the light source and the filter group F1
If the spectral transmission characteristics of ~Fn, the reflecting mirror R, and the spectral reflection characteristics are known, the spectral distribution can be determined by calculation.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the irradiation device according to the present invention, and FIG.
FIG. 3 is a schematic diagram of the optical system of the irradiation device, and is a diagram of the optical system when only the light source is moved in the optical system of FIG. 2. L...Light source, F1-Fn...Group of filters, R...Reflector, P...Irradiation surface,
41 +-62,71+ N2... Distance between light source and filter, θ1. θ2. θf, θ'2...
Solid angle created by a light source and filter.

Claims (1)

[Claims] 1. A light source with a known spectral distribution, a group of filters with arbitrary spectral transmission characteristics placed around the light source, and a group of filters so that the light from the light source that passes through the filter group gathers on the same surface (irradiation surface). By making the light source movable to any position within the space formed by the filter group, the radiant flux passing through each filter is controlled, and the light that gathers on the irradiation surface is spectrally divided. An irradiation device that allows easy control of distribution.