JP3044017B2 - Glass filter and drive glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass filter to be mounted on a photographic camera or a video camera, and to a drive glass used when driving a vehicle.

[0002]

As conventional color glass filters, there are typically a sharp cut filter and a narrow band monochromatic light filter. These filters have a function of restricting a specific wavelength region in the visible region and transmitting other regions, or a function of transmitting only a specific wavelength. Therefore, when such a color glass filter is used for color image photographing using wavelengths in the entire visible region, there is a problem that the overall color tone becomes the color tone of each filter. On the other hand, conventional drive sunglasses include filter glass sunglasses that sharply cut a specific wavelength range, neutral glass sunglasses that block the entire visible range, and sunglasses that are coated with a metal film that reflects light. There are photochromic drive sunglasses that automatically control the amount of light by the light of the sun. However, in sunglasses for driving, it is extremely important that not only a light-shielding property can be obtained, but also a color signal of a traffic light, particularly a red signal, can be clearly identified.

[0003] The present invention has been made in view of the above-mentioned problems with glass filters and sunglasses. First, the present invention not only transmits a specific wavelength region but transmits the entire visible region. It is an object of the present invention to provide a glass filter that realizes an effective color tone according to a photographing object without impairing a color balance. Also,
Secondly, it is an object of the present invention to provide a drive glass capable of obtaining an appropriate light-shielding property and capable of clearly identifying a red signal of a traffic light.

[0004]

In order to achieve the above object, a red-enhancing glass filter of the present invention comprises a neodymium oxide Nd ₂ O ₃ and a praseodymium oxide Pr ₆ O _11, and a short-wavelength side inhibitor. At a wavelength of 62
The transmittance at 0 nm is set to be equal to or higher than the transmittance at 550 nm or 420 nm. In the present invention,
Neodymium oxide Nd ₂ O ₃ and praseodymium oxide Pr
_{Since 6} O ₁₁ is added, the wavelength around 580 nm or 740 n
Absorption peaks specific to these oxides are formed near m, and the absorption clearly emphasizes red. In addition, wavelength 4
Since absorption peaks are formed around 40 nm and around 530 nm, blue and green colors become clear by this absorption.
Note that holonium oxide Ho ₂ O ₃ or erbium oxide Er ₂ O ₃ can be used instead of neodymium oxide Nd ₂ O ₃ .

[0005] As a short wavelength side inhibitor, for example, oxidation
Cellum CeO_TwoHowever, such short wavelength suppression
By adding the agent, the transmittance around 360nm wavelength
Can be formed, and
The transmission of the lower light can be reliably blocked. In addition, short
Titanium oxide TiO as a wavelength side inhibitor_Two(3-9wt
%) And iron oxide Fe_TwoO_Three(1-5wt%) may be used
No. The red-enhancing glass filter of the present invention is a neodymium oxide
Mu Nd_TwoO_Three(3-19 wt%), praseodymium oxide
Pr₆O₁₁(1-10wt%), cellium oxide CeO
_Two(0.4-5.0 wt%)
No. Further, more preferably, neodymium oxide Nd_TwoO
_Three(5-15 wt%), praseodymium oxide Pr₆O₁₁
(1.5-8wt%), cell oxide CeO_Two(0.5-
1.5 wt%), and more preferably, these
It is preferable to account for about 10-30% by weight. In the present invention
And vanadium oxide V_TwoO_Five(0.9-1.
0 wt%), chromium oxide Cr_TwoO_Three(0.08-0.1wt
%), Nickel oxide NiO (0.05-0.5 wt%)
To control the overall transmission.
You. Then, the transmittance at a wavelength of 620 nm is increased by 90% -20%.
If set to, it is suitable as a red emphasized glass filter
Can be used.

On the other hand, the green-enhanced glass filter of the present invention is prepared by adding neodymium oxide Nd ₂ O ₃ and praseodymium oxide Pr ₆ O ₁₁ and adding titanium oxide TiO ₂ , cerium oxide CeO ₂ and copper oxide CuO. , The transmittance at the wavelength of 550 nm, the wavelength of 620 nm and the wavelength of 420 n
m is set to be larger than the transmittance. Also in the present invention, neodymium oxide Nd ₂ O ₃ and praseodymium oxide Pr ₆ O
_{Since 11} is added, the wavelength around 580 nm or 740 n
An absorption peak is formed near m, and absorption peaks are also formed near 440 nm and 530 nm. Accordingly, the presence of these absorption peaks makes red, blue, and green clear. Note that holonium oxide Ho ₂ O ₃ may be used instead of neodymium oxide Nd ₂ O ₃ . In the present invention, the short wavelength side is suppressed by adding titanium oxide TiO ₂ and cerium oxide CeO ₂ , while the long wavelength side is suppressed by adding copper oxide CuO, and green is particularly emphasized. The total transmittance can be controlled by adding vanadium oxide V ₂ O ₅ , chromium oxide Cr ₂ O ₃ , nickel oxide NiO, etc., and the wavelength is 550 nm.
If the transmittance is set to 90% -60%, it can be suitably used as a green-enhanced glass filter.

The green-enhanced glass filter of the present invention comprises neodymium oxide Nd ₂ O ₃ (6-19 wt%), praseodymium oxide Pr ₆ O ₁₁ (4-12 wt%), titanium oxide Ti
O ₂ (2-4 wt%), cerium oxide CeO ₂ (0.4-
3.5 wt%), copper oxide CuO (0.06-1.0 wt%)
It is preferable to set the composition ratio as follows. Also, more preferably,
Neodymium oxide Nd ₂ O ₃ (6-12 wt%), praseodymium oxide Pr ₆ O ₁₁ (5-11 wt%), titanium oxide T
iO ₂ (2-3 wt%), cerium oxide CeO ₂ (0.5
-2.5 wt%), copper oxide CuO (0.1-0.6 wt%)
And more preferably, 10-30 wt% of the whole.
It is better to occupy the degree.

On the other hand, the blue-enhanced glass filter of the present invention is prepared by adding neodymium oxide Nd ₂ O ₃ and praseodymium oxide Pr ₆ O _11, and adding copper oxide CuO, cobalt oxide CoO and cerium oxide CeO ₂ , The transmittance at a wavelength of 420 nm is increased by a wavelength of 620 nm or 550 n.
m is set to be larger than the transmittance. Also in the present invention, neodymium oxide Nd ₂ O ₃ and praseodymium oxide Pr ₆ O
_{Since 11} is added, the wavelength around 580 nm or 740 n
An absorption peak is formed near m, and an absorption peak is also formed near 440 nm and 530 nm, and red, blue and green are sharpened by these absorptions. Note that holonium oxide Ho ₂ O ₃ may be used instead of neodymium oxide Nd ₂ O ₃ . In the present invention, since the addition of oxidizing Seryumu CeO _2, toward the vicinity of a wavelength of 420 nm, it is possible to form a sharp rise in transmittance,
In addition, it is possible to reliably block transmission of light in a short wavelength range below that. Further, in the present invention, cobalt oxide CoO
And copper oxide CuO are added in combination to suppress the long wavelength region, and the blue color is particularly emphasized. The overall transmittance can be controlled by adding vanadium oxide V ₂ O ₅ , chromium oxide Cr ₂ O ₃ , nickel oxide NiO, etc., and the transmittance at a wavelength of 420 nm can be reduced by 90% -50%.
%, It can be suitably used as a blue enhancement glass filter. For the purpose of emphasizing blue, nickel oxide NiO is also effective.

The blue-enhanced glass filter of the present invention comprises neodymium oxide Nd ₂ O ₃ (4-18 wt%), praseodymium oxide Pr ₆ O ₁₁ (3-8 wt%), and copper oxide CuO.
(0.07-1.0 wt%), cobalt oxide CoO (0.
0025-0.05wt%), cellium oxide CeO
Preferably, the composition ratio is ₂ (0.1-4.0 wt%). More preferably, neodymium oxide Nd ₂ O
₃ (5-10 wt%), praseodymium oxide Pr ₆ O ₁₁
(5-7 wt%), copper oxide CuO (0.1-0.6 wt%)
%), Cobalt oxide CoO (0.009-0.04 wt%)
%) And CeO ₂ oxide (0.4-3.0 wt%), more preferably 10-30 wt% of the total.
It is better to occupy the degree.

In any case, the glass filter of the present invention is usually made of silicon oxide SiO ₂ or boron oxide B ₂ O.
₃ and a glass-modified oxide such as barium oxide BaO and sodium oxide Na ₂ O, and further, antimony oxide Sb ₂ O ₃ and arsenic oxide As
_It is preferable to use a defoaming agent such as ₂ O ₃ . In such a case, silicon oxide SiO ₂ (40-70 wt%),
Boron oxide B ₂ O ₃ (2-10 wt%), barium oxide B
aO (2-10 wt%), sodium oxide Na ₂ O (10
-25wt%), antimony oxide Sb ₂ O ₃ (0-1wt
%) And arsenic oxide As ₂ O ₃ (0-0.5 wt%). In any case, the glass filter of the present invention has a refractive index of glass (refractive index of sodium D line) of 1.53-1.65, a dispersion of 30.0-50.0, and a specific gravity of 2.3-3. It is about 1.

The glass filter according to the present invention is typically used by attaching it to a photographic camera or a video camera, but in such a case, it does not impair the overall color balance. The color at the center of the photographing object can be effectively emphasized. That is, since the light transmitted through the glass filter of the present invention is configured to be separated into three colors of red, blue, and green, the photographed image or photograph is
The color tone and contrast are clearer than photographs and videos without using the glass filter of the present invention. For example, when photographing a red flower, a red-enhancing glass filter can be used to emphasize only the red flower without changing the surrounding color. Also, when photographing green leaves, a green-enhanced glass filter can be used to express a more vivid green color.When photographing a blue sea or sky, a blue-enhanced glass filter can be used. A clear blue color can be expressed.

On the other hand, the drive glass according to the present invention is
Neodymium Nd_TwoO_ThreeAnd titanium oxide T
iO_TwoAnd cerium oxide CeO_TwoAnd manganese oxide Mn
_TwoO _ThreeAnd iron oxide Fe_TwoO_ThreeAnd copper oxide CuO
The wavelength is 620 nm while keeping the transmittance low overall.
Set the peak of the transmittance at around 550nm
I have. In the present invention, manganese oxide Mn_TwoO_ThreeAnd iron oxide
Fe_TwoO_Three, The transmittance is totally suppressed.
To achieve light-shielding properties. Also, titanium oxide TiO
_TwoAnd cerium oxide CeO_TwoBy adding
The ultraviolet region is cut by suppressing the wavelength region. And acid
Neodymium Nd_TwoO_ThreeAdded, the wavelength 57
An absorption peak is formed around 0 to 600 nm, and the red color is bright.
It is emphasized clearly. However, the transmittance at 620 nm or more is extremely
Copper oxide CuO is added so as not to be too high.

The drive glass of the present invention comprises neodymium oxide Nd ₂ O ₃ (1-7 wt%), titanium oxide TiO ₂ (3-
16 wt%), cell oxide CeO ₂ (1-7 wt%), manganese oxide Mn ₂ O ₃ (0.1-0.8 wt%), iron oxide Fe ₂ O ₃ (1-7 wt%), copper oxide CuO (0 wt%) .03-
0.12 wt%). More preferably, neodymium oxide Nd ₂ O ₃ (2-5 wt%), titanium oxide TiO ₂ (7-10 wt%), cell oxide CeO
₂ (2-4 wt%), manganese oxide Mn ₂ O ₃ (0.2-
0.5 wt%), iron oxide _{Fe 2 O 3 (2-4wt%)} , a copper oxide CuO (0.04-0.08wt%), more preferably occupy 10-30Wt% of the total in these Is good.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The glass filter according to the present invention
Drive glass typically consists of glass forming oxide and gas.
The above glass composition comprising a lath-modified oxide and a defoamer,
Add appropriate coloring basic agent and wavelength inhibitor
Adjust to%. Specifically, the glass forming oxide is oxidized
Silicon SiO_Two(40-70 wt%) and boron oxide B_Two
O_Three(2-10 wt%), and the glass-modified oxide is
Barium oxide BaO (2-10 wt%) or calcium oxide
CaO (2-10 wt%) or magnesium oxide MgO
(2-10 wt%) or zinc oxide ZnO (2-10 wt%)
And sodium oxide Na _TwoO (10-25wt%) or acid
Potassium iodide K_TwoO (10-25wt%) or lithium oxide
Li_TwoO (0-5 wt%). The defoamer is acid
Antimony Sb _TwoO_Three(0-1 wt%) or arsenic oxide A
s_TwoO_Three(0-0.5 wt%). Also wear here
The color base agent is typically neodymium oxide Nd_TwoO_ThreePassing
Praseodymium Pr₆O₁₁It is.

The prepared glass raw materials are sufficiently mixed and homogenized, and this step is important for obtaining a homogeneous glass. First, the homogeneously mixed glass raw material is firstly melted (coarsely melted) using a refractory clay or quartz glass crucible. Next, the second stage melting (precision melting)
Is carried out in an electric furnace having a platinum crucible and a platinum stirring device. The glass thus melted has the same performance as optical glass. The glass has a refractive index (refractive index of sodium D line) of 1.53-1.
6, dispersion 30.0-50.0, specific gravity 2.30-3.
It is 10. In addition, per 2.00 mm of glass thickness,
Transmittance of 10-90 at a wavelength of 420 nm representing blue.
%, A transmittance of 20− at a wavelength of 550 nm representing green.
90%, transmittance of 1 at a wavelength of 620 nm representing red.
It can be set to 0-90%.

[0016]

[Example] [Red emphasized glass] Silicon oxide SiO_Two(5
8.22 wt%), boron oxide B_TwoO_Three(4.88wt
%), Barium oxide BaO (6.29 wt%), sodium oxide
Lithium Na_TwoO (20.38 wt%), arsenic oxide As_TwoO
_Three(0.5wt%), neodymium oxide Nd_TwoO_Three(7.03
wt%), cerium oxide CeO_Two(0.5wt%), oxidation
Raceodium Pr ₆O₁₁Red using (2.2 wt%)
Tempered glass was manufactured. In the above composition, cellum oxide C
eO_Two(0.5wt%) is added as an inhibitor on the short wavelength side
are doing.

FIG. 1 shows the characteristics of the filter glass (thickness: 2 mm). As shown in FIG. 1, the transmittance at the wavelength of 620 nm, the wavelength of 550 nm, and the wavelength of 420 nm are almost the same, and a sharp peak is formed around each wavelength.
The color tone and contrast become clear. In addition, vanadium oxide V ₂ O ₅ (0.9-1.0 wt.
%), Chromium oxide Cr ₂ O ₃ (0.08-0.1 wt.
%) And nickel oxide NiO (0.05-0.5 wt%) alone or in an appropriate combination, the wavelength is 620.
The transmittance in nm can be reduced to about 20%.

[Green-enhanced glass] Silicon oxide SiO
_Two(52.28 wt%), boron oxide B_TwoO_Three(3.92
wt%), barium oxide BaO (6.32 wt%), sodium oxide
Thorium Na_TwoO (18.45 wt%), antimony oxide
Sb_TwoO_Three(0.49wt%), neodymium oxide Nd_TwoO _Three
(7.02 wt%), praseodymium oxide Pr₆O
₁₁(6.03 wt%), titanium oxide TiO_Two(3.01wt
%), Cerium oxide CeO_Two(2.02wt%), copper oxide
Manufactures green-enhanced glass using CuO (0.45wt%)
did. In the above composition, titanium oxide TiO_Two(3.01wt
%) And cerium oxide CeO _Two(2.02wt%) is short wave
Copper oxide CuO (0.45wt%) as a long side inhibitor
It is added as an inhibitor on the long wavelength side.

The characteristics of this filter glass (thickness: 2 mm)
The properties are shown in FIG. As shown in FIG.
Peaks are formed at a wavelength of 550 nm and a wavelength of 620 nm.
And the transmittance at a wavelength of 550 nm is 4
Larger than the transmittance at 20 nm or 620 nm.
Green color is emphasized vividly. In addition, oxidation
Praseodymium Pr₆O₁₁If not used, oxidation
Vanadium V_TwoO_FiveChromium oxide Cr_TwoO_Three, Oxide
Gangan Mn_TwoO_Three, Iron oxide Fe_TwoO _ThreeEtc., alone or
Can be used in combination to create a similar green-enhanced glass.
Can be

[Blue emphasized glass] Silicon oxide SiO
_Two(55.07 wt%), boron oxide B_TwoO_Three(3.95
wt%), barium oxide BaO (6.35 wt%), sodium oxide
Thorium Na_TwoO (18.67wt%), antimony oxide
Sb_TwoO_Three(0.20 wt%), neodymium oxide Nd_TwoO _Three
(7.05 wt%), praseodymium oxide Pr₆O
₁₁(6.06wt%), cellium oxide CeO_Two(2.52
wt%), copper oxide CuO (0.10 wt%), cobalt oxide
Manufactures blue-enhanced glass using CoO (0.02 wt%)
did. In the above composition, copper oxide CuO (0.10 wt%) and
Cobalt oxide CoO (0.02wt%) suppresses the long wavelength side
Serum oxide CeO as an agent_Two(2.52wt%)
It is added as an inhibitor on the short wavelength side.

FIG. 3 shows the characteristics of the filter glass (thickness: 2 mm). As shown in FIG. 3, peaks are formed at a wavelength of 420 nm, a wavelength of 550 nm, and a wavelength of 620 nm, respectively.
Since m and wavelength are reduced in the order of 620 nm, blue is vividly emphasized. In addition, praseodymium oxide Pr
_{When 6} O ₁₁ is not used, neodymium oxide Nd ₂ O
₃ (17.0-18.0 wt%) and cerium oxide CeO
The combination of ₂ (0.5 wt%) can satisfy the condition of blue enhancement.

[Drive glass] Silicon oxide SiO
_Two(52.77 wt%), boron oxide B_TwoO_Three(3.90
wt%), barium oxide BaO (6.34 wt%), sodium oxide
Thorium Na_TwoO (18.49 wt%), antimony oxide
Sb_TwoO_Three(0.50 wt%), neodymium oxide Nd_TwoO _Three
(3.34 wt%), manganese oxide Mn_TwoO_Three(0.36
wt%), iron oxide Fe_TwoO_Three(2.96 wt%), titanium oxide
TiO_Two(8.25wt%), cellium oxide CeO
_Two(3.02 wt%), copper oxide CuO (0.06 wt%)
A drive glass was manufactured using the same.

FIG. 4 shows this filter glass (thickness 1.D).
92 mm). Manganese oxide Mn ₂ O ₃ (0.36 wt%) and iron oxide Fe ₂ O
The presence of ₃ (2.96 wt%) suppresses the transmittance as a whole and realizes light-shielding properties. Also, titanium oxide TiO
₂ (8.25 wt%) and cell oxide CeO ₂ (3.0
2 wt%), the short wavelength region is suppressed and the ultraviolet region is cut. Further, neodymium oxide Nd ₂ O ₃ (3.
34 wt%), an absorption peak is formed at a wavelength of about 570 to 600 nm, and red is clearly emphasized. The presence of copper oxide CuO (0.06% by weight) caused 620
The transmissivity above nm is suppressed so as not to be extremely high. As described above, this glass is suitable for a drive glass because it has an appropriate light-shielding property and emphasizes the most important red color of traffic signals (red / blue / yellow).

[Brief description of the drawings]

FIG. 1 illustrates the transmission characteristics of a red-enhanced glass filter.

FIG. 2 illustrates transmission characteristics of a green-enhanced glass filter.

FIG. 3 illustrates the transmission characteristics of a blue-enhanced glass filter.

FIG. 4 illustrates transmission characteristics of a drive glass.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-49641 (JP, A) JP-A-63-79736 (JP, A) JP-A-53-85813 (JP, A) 126050 (JP, A) JP-A-61-56325 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 5/22 G03B 11/00 G02C 7/10 C03C 4/08

Claims (3)

(57) [Claims] 1. A glass filter which is used by being attached to a camera for photographing, a camera for photographing video, and the like, comprising: neodymium oxide Nd ₂ O ₃ (5 to 15 wt%), praseodymium oxide Pr ₆ O ₁₁ (1.5 -8% by weight) and cerium oxide CeO ₂ (0.5-1.5% by weight).
It is added so as to have a concentration of at least 10 wt% and has a wavelength of 620 nm.
A red-enhanced glass filter in which the excess is set to be equal to or higher than the transmittance at a wavelength of 550 nm or 420 nm. 2. A glass filter which is used by being attached to a camera for photographing, a camera for photographing video, etc., comprising: neodymium oxide Nd ₂ O ₃ (6-12 wt%), praseodymium oxide Pr ₆ O ₁₁ (5-11 wt%). %), Titanium oxide T
iO ₂ (2-3 wt%), cerium oxide CeO ₂ (0.5
-2.5 wt%), and copper oxide CuO (0.1-0.6 wt%)
%) To increase the transmittance at a wavelength of 550 nm to a wavelength of 62
A green-enhanced glass filter set to have a transmittance greater than 0 nm or a wavelength of 420 nm. 3. A glass filter to be attached to a camera for photographing or a camera for photographing, which is used for neodymium oxide Nd ₂ O ₃ (5-10 wt%), praseodymium oxide Pr ₆ O ₁₁ (5-7 wt%). %), Copper oxide CuO
(0.1-0.6 wt%), cobalt oxide CoO (0.0
09-0.04 wt%), and cerium oxide CeO
₂ (0.4-3.0 wt%) and add a wavelength of 420 nm
A blue-enhanced glass filter in which the transmittance is set higher than the transmittance at a wavelength of 620 nm or 550 nm.