JPS60221704A - Optical element - Google Patents

Abstract

PURPOSE:To absorb infrared rays, ultraviolet rays, and visible range light other than near ultraviolet rays without providing any interference on an element surface nor spoiling its characteristics by providing a specific impregnated material layer on the surface of a plastic transparent body. CONSTITUTION:The impregnated material layer 1a which transmits light with wavelength within a specific range as to visible rays and absorbs light outside the range is formed on the surface of a transparent body formed of plastic, e.g. lens 1, filter for absorbing infrared or ultraviolet rays, and condenser lens 3. This impregnated material layer 1a uses a coloring agent made of dispersed dye. This coloring agent has minimum transmissivity to, for example, about 520nm wavelength and cuts off >=600nm long-wavelength light and <=480nm wavelength light. The colored layer 1a on the surface of the optical element is formed by being impregnated with the coloring agent, so uniform light is transmitted regardless of the thickness of the element. Consequently, the optical element which transmits light rays within the visible range of specific wavelength and absorbs light with wavelength outside the specific range while maintaining the characteristics of the optical element is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an optical element, and more particularly to an optical element that absorbs light having a wavelength outside a specific range.

(Prior Art) Conventionally, in optical elements such as lenses and Co/De/Sa lenses, as a means for absorbing light in the visible range of infrared, ultraviolet, near-infrared, and near-ultraviolet, (a) an optical element and a colored filter are used. Means for merging (b) Means for attaching a deposited film to the surface of an optical element by vacuum deposition or the like (C) Means for attaching a polymer film to the surface of an optical element.

However, in the optical element using the above-mentioned conventional means, (a) a processing car is required for both the optical element and the colored filter, and in particular, a polishing process is also required separately, the structure is complicated, and the price is expensive. There was a problem. There are also problems such as (b) vacuum deposition is expensive and it is difficult to homogenize the optical properties of the deposited film, and (C) it is difficult to uniformly apply the polymer film to the surface of the optical element. There was a point.

(Object of the Invention) The present invention has been made to solve the above-mentioned problems, and is capable of infrared, ultraviolet, and near-infrared radiation that does not impair the characteristics of the optical element without providing an interface area on the surface of the optical element. ,
The object of the present invention is to provide an optical element that absorbs light in the near-ultraviolet to visible range.

(Structure of the Invention) An optical element has an impregnated material layer on the surface of a transparent body made of plastic that transmits wavelengths within a specific range of visible light and absorbs wavelengths outside the specific range.

(Effects of the Invention) According to the present invention, an optical element that has the optical properties of an optical element with a single optical concentrator, can transmit visible light of a specific wavelength, and absorb light of a wavelength outside the specific range. This has the effect of being easy to provide.

(Example) Hereinafter, one embodiment of the invention will be described based on the accompanying drawings.

FIG. 1 shows a lens as an optical element, and FIG. 1(a) is a perspective view, and FIG. 1(b) is a sectional view.

The number 1 is made of plastic material, for example 0.
It consists of zoetelene bis alicarbonate containing 0.001% of hydroxybenzophenol. Disperse dyes are used as impregnating substances that transmit light within a specific range and absorb infrared rays, ultraviolet rays, and nearby light rays outside the specific range. As the disperse dye, a coloring agent consisting of a blue dye and an orange dye is used. For example, Disposer Blue 140 5g/l and Disposer Orange 16o
, osr〆l dissolved in water IAi is used. The impregnated material layer 2 forms a colored layer with a uniform surface regardless of the thickness of the lens.

Next, FIG. 2 shows the spectral characteristics of the lens of the example. In the figure, the horizontal axis is wavelength (nm), and the vertical axis is light transmittance (nm).
%). In the figure, the dotted line is the spectral characteristic when the impregnated substance layer does not contain the colorant, and the solid line is the spectral characteristic when the impregnated substance layer is impregnated with the colorant. The spectral characteristics of the impregnated colorant are such that it has a maximum transmittance of 520 nm and blocks long wavelength light of 600 nm or more and light of a wavelength of 480 nm or less. Within the human visible range from 380 nm to 780 nm, the light rays from a specific visible device are transmitted, and other wavelengths are blocked. That is, it absorbs infrared and near-infrared visible light, transmits only visible light in a specific range around 520 nm, and also absorbs ultraviolet light.

According to this example, ta/gustenra/zo and halo) f
As the radiant energy of the y9 horns moves from longer wavelengths in the visible range to infrared ranges, it becomes thicker and causes glare, but this glare can be reduced. Further, by coloring only the surface layer of the lens, a uniform colored layer can be formed on the surface regardless of the thickness of the lens, and the light passing through the lens 4 can be made to have uniform brightness.

By combining the functions of a lens and a filter with a single lens, the number of parts of the optical device can be reduced, and the structure can be simplified and inexpensive.

FIGS. 6 and 4 are diagrams showing other embodiments of the present invention, in which a filter 2 and a condenser lens 3 are used as optical elements. The filter 2 in FIG. 6 can be used both as an infrared absorption filter and an ultraviolet 11M absorption filter. Filter 2 and condenser lens 3 are
It is necessary that it be made of plastic material as well as the actual column.

According to these embodiments, since the colored layer is provided only on the surface layer of the optical element, uniform light can pass through regardless of the thickness of each optical element.

The embodiments of the present invention have been described above based on the accompanying drawings, but the specific configuration is not limited to the embodiments. For example, in order to more effectively absorb ultraviolet rays harmful to human eyes, optical An ultraviolet absorber may be attached to the surface of the element.

[Brief explanation of drawings]

FIG. 1 is a perspective view and a cross-sectional view of an optical element according to an embodiment of the present invention. FIG. 2 is a diagram showing the spectral characteristics of the same example. FIGS. 3 and 4 are perspective views of a filter and a condenser lens as other embodiments of the present invention. (Coding theory BA) 1...Lens 1a...Impregnated material layer 2...7-ilta 3...Condenser lens agent Asamura Figure 1 (a) (b) Fang 3 Figure 4

Claims (1)

[Scope of Claims] (1) An optical element having an impregnated material layer on the surface of a transparent body made of plastic that transmits wavelengths within a specific range of visible light and absorbs wavelengths outside the specific range. . (2. The optical element according to claim 1, wherein the optical element is a lens. (3) The optical element according to claim 1, wherein the optical element is an infrared absorption filter. (4) In the statement of claim 1, optical 7
The optical element wherein the confectionery is an ultraviolet absorption filter. (5) The optical element according to claim 1, wherein the optical element is a co/de/sa lens. (6) An optical element according to claim 1, wherein the impregnated material layer is formed of a coloring agent consisting of a disperse dye.