WO2001042827A1

WO2001042827A1 - Photic paroxysmal brain wave reaction preventive filter

Info

Publication number: WO2001042827A1
Application number: PCT/JP2000/008706
Authority: WO
Inventors: Yukitoshi Takahashi; Shigetoshi Fujiwara
Original assignee: Japan As Represented By President Of Gifu University; Filtec Inc.
Priority date: 1999-12-08
Filing date: 2000-12-08
Publication date: 2001-06-14
Also published as: JP2001166130A

Abstract

A filter for preventing children who might have a photic paroxysmal brain wave reaction induced even by a feeble photic stimulation such as by viewing a CRT (TV) from being provoked to have a photic paraoxysmal brain wave reaction and a subsequent photosensitive attack. The filter has a characteristic that the transmittance shown by the attenuation curve drawn toward the long wavelength side in the range over at least 600 nm decreases to 20 % at the range from 610 to 680 nm and a characteristic that the average transmittance over the range from 400 to 700 nm is suppressed below 65-50 %. The characteristics of the filter are realized by coloring glass or resin by adding a coloring component containing Cu ions essentially and at least one kind of ions among from Nd ions, Fe ions, Co ions, and Mn ions, thus producing a filter of absorption type preferable to, e. g. a CRT (TV).

Description

Technical Information

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a funtor that suppresses the amount of transmitted light of a specific wavelength to prevent a sudden photoencephalogram response. Background art

Many children across the country watching the TV animation `` Pocket Monster I '' broadcasted on February 9, 1997, saw convulsions caused by the scene where the red and blue flashes flickered violently at the program climax. It caused a so-called "Pokemon uproar" that caused a seizure. This phenomenon was a good indication of how many children showed a light burst electroencephalographic response. Including the number of potential photosensitizers, the proportion of children with photo-spontaneous electroencephalographic reactions is estimated to be as high as about 10%.

Research on filters to prevent photo-spontaneous electroencephalogram reactions is being conducted by research institutions in various countries, but as yet, sufficient optical performance has not yet been determined for prevention, and filters with such characteristics are naturally available. One is not put into practical use _c

It is an optical filter to prevent unfortunate accidents of light-sensitive individuals with photo-spontaneous electroencephalogram reaction, and to relieve many children and their parents from the anxiety. The purpose of the present invention is to find out what kind of light causes the light spontaneous electroencephalogram response, and to determine the transmission characteristics as a filter necessary to prevent the light spontaneous electroencephalogram reaction based on the results. The most fundamental problem to be solved by the present invention is to propose a technology for practical use of a filter having the transmission characteristics. Disclosure of the invention

In order to achieve the above object, a photo-sudden electroencephalogram reaction prevention filter according to claim 1 of the present invention is provided. The filter is at least at wavelengths longer than 60 Onm, and the wavelength at which the transmittance becomes 20 ° / ₀ in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 61 to 68 Onm. It is characterized by having both a certain characteristic and a characteristic of suppressing the average transmittance from 400 to 70 Onm by 65 to 20%.

Claim 2 is that at least the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side on the longer wavelength side than 60 Onm is 610 to 68 Onm. The characteristics are in the range of 400-70 Onm and the average transmittance is 60-20. / ₃ , characterized in that the transmittance is at least 20% in the transmittance attenuation curve formed toward the long wavelength side at wavelengths longer than 60 Onm. And a characteristic that suppresses the average transmittance from 400 to 700 nm by 55 to 20% at the wavelength of 610 to 68 Onm; On the longer wavelength side than 60 Onra, the characteristic where the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 60 to 675 nm, and 400 to 70 It also has a characteristic of suppressing the average transmittance of Onm by 60 to 20%; Claim 5 at least on the wavelength side longer than 600 nm and attenuation of the transmittance formed toward the longer wavelength side. In the curve, the wavelength at which the transmittance is 20%, the power is in the range of 6 10 to 6 75 nm, and the average transmittance at 400 to 70 Onm is 5 5 It is characterized by having a characteristic of suppressing it by up to 20%.

Further, claim 6 relates to a photo-sudden electroencephalogram reaction prevention filter, characterized in that Cu ion is essential as a coloring component and at least one of Nd ion, Fe ion, Co ion and Mn ion is included. is there. Claim 7 is characterized in that Cu ions and Nd ions are contained as essential coloring components. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a spectral transmittance curves of the light-absorbing filter CF 1 _c

FIG. 2 is a spectral transmittance curve diagram of the light absorption type filter CF2.

FIG. 3 is a spectral transmittance curve diagram of the light absorption type filter CF3.

FIG. 4 is a spectral transmittance curve diagram of the light absorption type filter CF4. FIG. 5 is a spectral transmittance curve diagram of the light absorption filter CF5.

FIG. 6 is a spectral transmittance curve diagram of the light absorption type filter CF6.

FIG. 7 is a diagram of a reflection filter-TF1 spectral transmittance curve of a multilayer film. FIG. 8 is a spectral transmittance curve diagram of a multilayer filter of a reflection type filter TF2. _C FIG. 9 is a spectral transmittance curve diagram of a combination of the filter type CF1 and TF1.

Figure 1 0 is a spectral transmittance curve chart when combining filter one CF 2 and TF 1 _c

Figure 1 1 is a spectral transmittance curve diagram of combining the filter one of CF 4 and TF 1 _c

FIG. 12 is a spectral transmittance curve diagram when the filters CF 1 and TF 2 are combined.

FIG. 13 is a spectral transmittance curve diagram when filters CF 2 and TF 2 are combined.

FIG. 14 is a spectral transmittance curve diagram when filters CF3 and TF2 are combined.

FIG. 15 is a spectral transmittance curve diagram when the filters CF 4 and TF 2 are combined.

Figure 1 6 is a spectral transmittance curve chart when combining filter CF 3 and CF 6 _c

FIG. 17 is a spectral transmittance curve diagram when filters CF4 and CF6 are combined.

FIG. 18 shows the correlation between AXBZ100 in Table 1 and the prevention rate of the photo-spontaneous electroencephalogram response. BEST MODE FOR CARRYING OUT THE INVENTION

The present inventors have determined whether the intensity of visible light affects the appearance of the photo-spontaneous electroencephalogram response (light-intensity dependence), and whether there is a specific wavelength range in which the photo-spontaneous electroencephalogram response occurs. Optical filters with various characteristics (wavelength dependence) were manufactured, and these were used alone or in combination to conduct detailed clinical tests. First, a neutral density filter that reduces the overall transmission from 40 Onm to 700 nm—a filter (CF 1 with an average transmission of 75 ° / .; Figure 1 and 50% CF 2: Figure 2) alone We investigated the effect of attenuating the amount of visible light on the light sudden EEG response. As a result, although the prevention effect was recognized in any case compared to the case of the naked eye (100%), there was no difference between CF1 and CF2, and the prevention effect was improved in about 33% of the test subjects. Only recognized (see Table 1 below) _c

Next, using a selective transmission filter (with a center wavelength of 600, 620, 640, 660, 680, and 700 nm) that transmits only a narrow specific wavelength band, the wavelength dependence of the photo-spontaneous electroencephalogram response was also investigated. A systematic study shows that light containing a wavelength band around 70 Onm can cause a photo-spontaneous electroencephalographic response. Was found to be quite large.

From these results, the present inventors expect that if the wavelength region around 70 Onm is completely shielded, the photo-spontaneous electroencephalogram response will be significantly suppressed. The test was performed using a long-wavelength blocking filter (TF1: Fig. 7), which has an attenuation curve that attenuates the transmittance toward longer wavelengths. However, the results were surprising (see Table 1) ₌

As described above, despite the use of a filter that completely shielded the wavelength region around 70 Onm where the appearance of the photo-spontaneous electroencephalographic response was clearly observed, the photo-spontaneous electroencephalographic response could not be sufficiently suppressed. Yes-So, we examined the effect of preventing the photo-spontaneous electroencephalogram response using a filter (TF2; Fig. 8) whose shielding band was expanded not only to 70 Onm but also to around 650 nm, but contrary to the expectations of the present inventors, There was no significant advantage over TF1-the suppression of the light burst EEG response was not so simple.

<A combination of an absorption filter (一) that suppresses the transmittance from 400 to 70 Onm and a multilayer filter (②) that blocks long-wavelength visible light> Based on the working hypothesis that the photo-spontaneous electroencephalographic response may be caused by a complex mechanism, the present inventors then proceeded with two types of filters: An absorption filter (CF1, CF2, CF3, CF4) that suppresses the transmittance of 70 Onm and a multilayer filter (TFl, TF2) that blocks long-wavelength visible light I decided to test in the state _c

Here, CF 1 and CF 2 are absorption type filters (ND) with the characteristic of neutral density, to which Fe ions, Co ions, etc. are added as coloring components, as shown in Figs. 1 and 2, respectively. The average transmittance at 400 to 70 Onm is 75% and 50% as follows: CF3 and CF4 are both absorption filters with Nd ions added as coloring components, as shown in Figs. 3 and 4, respectively. As described above, it has a spectral transmittance characteristic of selectively transmitting only BGR. Each of TF 1 and TF 2 is a multilayer filter and has a characteristic of shielding a wavelength band around 70 Onm as shown in FIGS. Then, as a result of the test, they found that the effect of suppressing the photo-spontaneous electroencephalogram response could be dramatically improved, which was clearly different from the previous tests performed by ① and ② alone. Some combinations were also very effective for those who had a particularly prominent light-evoked EEG response. This is a landmark achievement that greatly exceeds expectations and is the most important part of the present invention.

Here, Table 1 shows the difference in the prevention rate of the photo-spontaneous electroencephalogram response based on the combination of the filters:

'I was in the experiment (\ t, mod

Filter and ^ * ■ ^ ϋ

Hakuguchi I Hatsuku / Oi "^ Hakuguchi ~ vjuniii) i \ 15 Also WJ JL

(')) HI), ^ ϊβ ^ * JΗ' A

1 7

丄 X-丄丄 / 0 ο then 1 Δ)

«7 _nm oo AO ri

A 1 Γ Γ 凶 β) β Q Q

O Ό o, Q Q

Ό C Κ 丄 1 丄 (\ 1 丄ノ T l F r 1 on (β 7 7

O O ir

\ C F 2 (Fig. 2) T F 1 (Fig. 7) \ 1 π 9 U

7 C F 4 (Fig. 4) T F 1 (Fig. 7) Fig. 1 1 6 6 9 3 3 2 2 5 3

8 C F 1 (Fig. 1) 'Γ F 2 (Fig. 8) Fig. 1 2 6 2 5 5 0 3 1 7 6

9 C F 2 (Figure 2) T F 2 (Figure 8) Figure 1 3 6 1 8 2 5 1 5 8 8

1 0 C F 3 (Figure 3) T F 2 (Figure 8) Figure 1 4 6 2 7 3 3 2 0 8 7

1 1 C F 4 (Figure 4) T F 2 (Figure 8) Figure 1 5 6 2 5 2 5 1 5 9 4

1 2 C F 3 (Figure 3) C F 6 (Figure 6) Figure 1 6 6 3 4 3 3 2 1 8 9

1 3 CF 4 (Figure 4) CF 6 (Figure 6) Figure 1 7 6 2 4 2 5 1 5 8 4

The combinations of the filters that showed the most remarkable effects were as follows (see No. 11 in Table 1).

CF 4 was used as a filter to attenuate the light amount in the wavelength range of 400 to 70 Onm, and TF 2 was used as a filter to block visible light in the long wavelength region (the transmission spectrum of these combinations). Is shown in Figure 15) ₌

In addition, the combination of CF 2 and TF 2 also showed a considerably high effect (the transmission spectrum of these combinations is shown in FIG. 13).

However, the present invention is not limited to this.

Next, the present inventors noticed that a filter that shields around 70 Onm used in the test up to that time, that is, a filter that blocks visible light in a long wavelength region is realized by a multilayer film. Certainly, when this type of filter is installed, the light coming out of the display device such as a CRT (TV) as an image is adjusted by the filter to light that does not induce a light sudden EEG response. However, if a light that evokes a photo-spontaneous electroencephalogram response from some light source on the side of the person watching the CRT (TV) irradiates this kind of multilayer filter, this filter will leave that light as it is. Because of the reflection, people watching the CRT (TV) will see the light. Light sources that emit undesired light are consciously avoided and not seen, but light reflected and reflected on the front of the CRT (TV) that you are actively watching cannot be avoided:

The present inventors were confused here, though it was an alternative to a multilayer filter from a multilayer filter. There is no absorption filter equivalent to the characteristics of a multilayer film that sharply blocks long-wavelength visible light.

Certainly, as an absorption type filter that shields around 70 Onm, CF 5 and CF 6 that utilize the light absorption of Cu (+2) ions have a certain strength, as shown in Figs. 5 and 6, respectively. It is clearly different from a reflection type filter using a multilayer film. This is a characteristic in which the transmittance attenuates gradually from around 520ηm to 78 Onm, and transmits light to some extent even at 650 to 750 nm. It was thought that the suppression effect could not be expected so much. The present inventors examined the effect of suppressing the photo-spontaneous electroencephalogram reaction by using the Cu ion-added filter (CF5) alone to make sure that the effect was higher than that of the multilayer filter. It is.

Further, the present inventors examined how much the suppression effect of the light sudden electroencephalogram reaction changes by replacing CF 6 as the filter of (2) and superimposing with the filter of (1). As a result, the comparison of CF3 + TF2 and CF3 + CF6 in Table 1; or the comparison of CF4 + TF2 and CF4 + CF6, the absorption type filter (CF6) with Cu ion addition was also found. Thus, the suppression effect was quite close to that of a multilayer filter (TF2) that sharply shields wavelengths longer than 65 Onm. This is another important point of the present invention.

Even so, this result showing the effectiveness of the light absorption type filter does not mean that the application of the reflection type filter using a multilayer film is denied. The light coming from behind the person is prevented by the head, and the multilayer film is extremely effective in embodying the present invention in an ophthalmic lens where it is almost unnecessary to consider the reflection by the multilayer film. It is.

The present inventors have conducted studies based on the above experimental results to determine the transmission characteristics required to prevent the occurrence of the photo-sudden electroencephalographic response. As a result, the following two values were found to be particularly effective in determining the transmission characteristics of the filter. One is an average transmittance from 400 to 700 nm; the other is a wavelength longer than 600 nm, at which the transmittance becomes 20% in a transmittance attenuation curve formed toward the longer wavelength side. It is.

In order to realize the present invention, it is essential that the average transmittance of 400 to 70 Onm is 65 ° / ₀ or less, and it is desirable that the average transmittance be lower, but if it is less than 20%, it will be too high. Therefore, the average transmittance of 400 to 70 Onm is judged to be suitable between 65 and 20%, because it may cause eyestrain. On the longer wavelength side than 60 Onm, the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side has a sudden burst of light with a transmission characteristic that is closer to the longer wavelength side than 68 Onm. Since the EEG response cannot be suppressed, a shorter wavelength is desirable, but it should be shorter than 615 nm. In this case, the bluish color is too strong, which may cause visual impairment due to unnatural color tones. Therefore, the wavelength range suitable for the present invention is limited to 615 to 68 Onm. On the longer wavelength side than 600 Onm, the numerical value (A) of the wavelength at which the transmittance becomes 20% in the attenuation curve of the transmittance formed toward the longer wavelength side and the flat value of 400 to 700 nm. The value obtained by multiplying the value of the average transmittance (B) by 100 is divided by 100, and only the upper two digits are taken as the effective figure. -In the figure, ◎ indicates the combination of filters using TF2 (No. 8 to 11 in Table 1), and # indicates the combination of filters with TF2 changed to CF6 (Table 1). No. 12 to 13) of the above, and 〇 indicates the case of the combination of filters using TF1 (No. 5 to 7 in Table 1).

This FIG. 18 clearly shows the magnitude of the synergistic effect of A and B, and the magnitude of the effect of the above-mentioned 20% transmission wavelength.

That is, the optical sudden electroencephalogram reaction prevention filter according to the present invention has at least a wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed on the longer wavelength side than 60 Onm toward the longer wavelength side. It is characterized by having both a characteristic in the range of 10 to 68 Onm and a characteristic of suppressing the average transmittance from 400 to 700 nm by 65 to 20%. These two optical characteristics are limited irrespective of the composition of the filter material and the like in embodying the present invention.

The figures and tables used in the above description are summarized here.

FIGS. 1 to 6 show the spectral transmittance curves of the light absorbing filters CF 1 to CF 6 respectively; FIGS. 7 and 8 show the spectral transmittance curves of the multilayer filters TF 1 and TF 2 respectively. Is shown. 9 to 17 show spectral transmittance curves when the above filters are combined, and the combinations are as shown in Table 1. Further, in FIG. 18, on the longer wavelength side than 60 Onm, the numerical value (A) of the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side (A), and The value obtained by multiplying the average transmittance value (B) of ~ 70 Onm by 100 is divided by 100, and the correlation between the numerical value of the upper two digits and the rate of prevention of the light sudden EEG reaction is shown. Next, in Table 1, the numbers from the left end; one filter corresponding to the above ①; One filter at a wavelength longer than 60 Onm, at a wavelength where the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side; Average transmittance at 400 to 70 Onm : The upper two digits of (A) X (B) Z100 above; and the right end shows the prevention rate of the photo-sudden electroencephalographic response.

The present inventors have studied visibility and mass productivity for practical use of the present invention.

First, visibility.

In the case of combining the filters (1) and (2) above, the entire color becomes slightly bluish when viewed through a filter in order to suppress the transmittance particularly in the R wavelength band of the BGR. Although there is not much problem in the case of a short time, there is a possibility that a person may feel uneasy by seeing an unnatural color tone in the case of a long use. Therefore, the present inventors have studied to improve the filter characteristics so that the optical spontaneous electroencephalogram reaction can be suppressed and an image or the like can be visually recognized in a state closer to a natural color.

As a result, it was found that this problem could be solved by lowering the transmittance of the BG wavelength band within the BGR, and the color could be made more natural.

Next, mass productivity will be described.

The present inventors have studied various element technologies from various angles and devised the following mass production technologies. These mass production technologies can be applied not only to small products such as glasses, but also to low-cost large display devices.

1) One is mass production technology based on colored glass. Adds Cu (+ divalent) ions based on phosphate glass to suppress transmittance in the wavelength region longer than 615 nm. Shields and selects from Fe, Co, Mn, Cr, Nd ions, etc. This method controls and adjusts the transmittance of 400 to 70 Onm while maintaining the BGR color balance by adding the coloring components obtained and adjusting their amounts.

2) This is a method in which the resin is colored by the addition of a complex compound of a metal ion or a pigment as in 1).

3) Form 2) into a film and paste it on a glass or resin plate It is also effective to make a sandwich or a sandwich using a glass or a resin plate.

4) The same method of coating resin on glass or resin plate as in 2) is an extremely useful method for realizing a low-cost large display device.

Although the above-mentioned mass production techniques are all based on the light absorption type, it is a matter of course that the present invention is not limited to these. In the case of a spectacle lens, a multilayer film method that can realize a part or all of the transmission characteristics is effective.

There is no particular limitation on the mass production technique for realizing the function of the optical spontaneous electroencephalogram reaction prevention filter according to the present invention, and various selections of elementary surgery and the combination thereof can be applied according to the shape and application.

The optical spontaneous electroencephalogram reaction prevention filter according to the present invention is capable of controlling the optical spontaneous electroencephalogram reaction such as a display device using a CRT, a liquid crystal, a plasma, an EL, an LED, etc. It can be applied as a structure directly coated on a potential trigger object; or as a retrofit structure. Example

<Example 1> The transmission characteristic of FIG. 15 formed by superposing the absorption type filter CF 4 having the transmission characteristic of FIG. 4 and the reflection type filter TF 2 of the multilayer film having the transmission characteristic of FIG. That is, on the longer wavelength side than 60 Onm, the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is 625 nm, and the average transmittance from 400 to 700 nm is 25 ° / o. As a result of examining the effect of preventing the photo-spontaneous electroencephalographic response on a photosensitive person having a photo-spontaneous electroencephalographic reaction with the filter having the transmission characteristics based on the present invention, as shown in No. 11 of Table 1, An extremely high prevention rate of 94 ° / ₀ was confirmed.

(In this embodiment, it is needless to say that the same kind of characteristics can be realized as one filter by the above-mentioned mass production technology.) <Example 2> The transmission characteristics of FIG. 16 formed by superimposing the absorption type filter CF3 having the transmission characteristics of FIG. 3 and the absorption type filter CF6 of the transmission characteristics of FIG. 6; On the longer wavelength side than 60 Onm, the wavelength at which the transmittance becomes 20% in the attenuation curve formed toward the longer wavelength side is 634 nm, and the average transmittance from 400 to 70 Onm is 33%. As a result of examining the effect of preventing a photo-spontaneous electroencephalographic reaction on a photosensitized person having a photo-spontaneous electroencephalographic reaction with a filter having the transmission characteristics based on the present invention, as shown in No. 12 of Table 1, An extremely high prevention rate of 89% was confirmed. (In the present embodiment, the characteristics of the present invention are realized by a combination of filters, but it goes without saying that the same kind of characteristics can be realized as one filter by the above-mentioned mass production technology.) Availability

Opportunities to come into contact with images such as CRT (TV) will surely increase in the future. Power Considering the current situation where potentially light-sensitive individuals with sudden photoencephalogram reactions reach 10% of children, Providing images that do not take any measures for the light is extremely dangerous, and must be said to cause great anxiety to light-sensitive individuals.

The present invention has been made to relieve a photosensitized person having a photo-spontaneous electroencephalogram reaction from such anxiety, and to observe a CRT (TV) or other image through a filter according to the present invention. The danger of electroencephalographic reactions can be avoided.

The present invention will play a major role in removing a kind of social unrest about the image culture represented by the Pokemon uproar.

Claims

The scope of the claims

1. At least, in the long wavelength side of 60 Omn, and transmittance area by der wavelength 61 0-68 Omn comprising 20% characteristic in the attenuation curve of the transmittance which is formed toward the long wavelength side, ⁴ The optical spontaneous electroencephalogram reaction prevention filter, which also has the characteristic of suppressing the average transmittance from 00 to 70 Onm by 65 to 20%:

2. At least on the longer wavelength side than 60 Onm, the characteristic where the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 610 to 68 Onm; light sudden electroencephalographic responses prevention filter for the average transmission to 70 Onra characterized by having combined repressing quality in 60-20% ₌

3. At least on the longer wavelength side than 60 Onm, the characteristic where the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 610 to 68 Onm; An optical spontaneous electroencephalogram reaction prevention filter that also has the property of suppressing the average transmittance of 70 Onm by 55 to 20%.

4. At least on the longer wavelength side than 60 Onm, the characteristic where the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 610 to 675 mn, and 400 An optical spontaneous electroencephalogram reaction prevention filter characterized in that the filter also has a characteristic of suppressing the average transmittance of up to 70 Onm by 60 to 20 <½.

5. At least on the longer wavelength side than 60 Onm, the characteristic in which the wavelength at which the transmittance becomes 20% in the transmittance attenuation curve formed toward the longer wavelength side is in the range of 60 to 675 nm, An optical spontaneous electroencephalogram reaction prevention filter characterized by having a characteristic of suppressing the average transmittance of 400 to 70 Onm by 55 to 20%.

6. The light spontaneous electroencephalogram reaction prevention according to claims 1 to 5, wherein Cu ion is essential as a coloring component, and at least one of Nd ion, Fe ion, Co ion and Mn ion is included. filter-

7. The light-sudden electroencephalogram reaction prevention filter according to any one of claims 1 to 5, wherein the filter includes at least Cu ions and Nd ions as essential coloring components.