JP2002156501A - Lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens which gives rise to no fogging due to dew condensation, no dust attraction due to electrostatic charge and no heat kept in. SOLUTION: The lens 10 is provided with oxygen permeability, electrical conductivity and a radiation and electromagnetic wave shielding function by containing conductive zinc oxide as a constituent. Because dissipation and absorption of heat is increased and assimilation into the outside air temperature takes place, due to manifestation of the oxygen permeability in the lens 10 itself, the condensation and the keeping in of heat is not generated. As the electrical conductivity is simultaneously manifested, no dust adsorption due to the electrostatic charge is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass lens used for optical devices such as glasses and cameras.

[0002]

2. Description of the Related Art Optical devices such as lenses and prisms are made of optical glass having high uniformity, high precision and high transmittance and refractive index. Such optical glass, in addition to the usual glass components, for the purpose of increasing the refractive index, lead,
Elements such as barium and boron are added, and special compositions according to each application are also produced.

When it is necessary to shield ultraviolet rays and infrared rays contained in sunlight and the like, a lens having a thin film having a function of shielding ultraviolet rays and infrared rays coated on the surface, or ferrous oxide as an ultraviolet ray and infrared ray shielding agent, A lens formed of glass containing ferric oxide, zinc, aluminum, antimony, or the like is used.

[0004]

A conventional optical glass lens takes a long time to assimilate to the ambient temperature when the ambient temperature changes. When the temperature drops, when the optical device is moved from a cold place to a hot place,
Alternatively, when an optical device is brought into a high-humidity place, moisture in the air often condenses on the surface of the lens, which is lower in temperature than the surroundings, and the lens often fogs. Further, the conventional lens may be charged with static electricity and adsorb surrounding dust.

[0005] For this reason, conventional glasses and cameras are cumbersome because the surface must be wiped with a soft cloth each time the lens becomes cloudy or dust adheres, and thus it is troublesome. Also, the lens surface may be damaged during wiping.

Further, the lens mounted on the front of the light emitting lamp of the conventional lighting device has a low function of dissipating the heat generated from the light emitting lamp, so that heat is easily trapped inside the lens, and the lighting device and its surroundings are easily immersed. Raises the temperature, causing various adverse effects.

An object of the present invention is to provide a lens which does not cause fogging due to dew condensation, dust adsorption due to electrification and heat buildup.

[0008]

The lens according to the present invention is characterized in that the lens is formed of conductive glass containing a conductive metal oxide as a constituent. By adopting such a configuration, by containing a conductive metal oxide, oxygen permeability is exhibited, heat dissipation and absorption are increased, and assimilation with the outside air temperature is promptly performed. No heat build-up occurs, and at the same time, conductivity is also exhibited, so that dust adsorption due to charging does not occur.

A lens formed of such a conductive glass can be used in the same manner as a conventional lens. Unlike a conventional surface-coated glass, the glass itself has oxygen permeability and conductivity. Also, there is no deterioration or deterioration with time due to surface damage, and the durability is excellent.

Further, since a lens formed of conductive glass containing a conductive metal oxide also has a function of effectively blocking ultraviolet rays and infrared rays, it can be used for optical equipment that requires such a function. It can be suitably used.

In this case, by setting the electric conductivity of the conductive glass to 10 ⁻³ to 10 ⁻⁸ s / m, the above-mentioned functions can be effectively exhibited without losing the inherent properties of the glass. it can.

Here, any one of conductive zinc oxide, conductive tin oxide, and tin-doped indium oxide can be used as the conductive metal oxide. Conventionally, these conductive metal oxides are substances that have been coated on the glass surface as an ultraviolet or infrared ray shielding material, but by forming a lens with glass containing these substances as constituents, the Not only X-ray,
By exhibiting the function of blocking α-rays, β-rays, γ-rays, electron beams, and neutron rays, the conductivity of the glass itself is increased. Therefore,
For example, it is possible not only to further enhance the function of the conventional colored lens sunglasses, but also to obtain colorless and transparent sunglasses having the same function.

As described above, any one of conductive zinc oxide, conductive tin oxide, and tin-doped indium oxide can be used as the conductive metal oxide. In particular, conductive zinc oxide is contained. Lenses made of glass are superior in the function of shielding X-rays, α-rays, β-rays, γ-rays, electron beams, and neutron rays compared to glass containing conductive tin oxide and tin-doped indium oxide. Deterioration is extremely small, and it is easy to adjust transparency by coloring.

As such conductive zinc oxide, there is a conductive zinc oxide containing aluminum, titanium, tin, or a compound thereof, and a conductive zinc oxide containing 0.5 to 10% by weight of aluminum is produced. It is easy to knead with glass in the process, and a lens formed of such a glass containing conductive zinc oxide is particularly suitable for X-ray, α-ray, β-ray,
Excellent in the function of shielding gamma rays, electron beams and neutron rays.
As such a conductive zinc oxide, a conductive zinc oxide (trade name: 23K) manufactured by Hakusuiteku Co., Ltd. is preferable.

As a component of the above-mentioned glass, Si is used.
O ₂ is 65% ~80%, Na ₂ O is 10% ~20%, Ca
O is 5% ~15%, MgO is 0% ~10%, K ₂ O is 0
% To 5%, Al ₂ O ₃ is 0% to 5% as basic components, and oxygen, silicon, sodium, calcium, boron, lithium, sulfur, antimony, aluminum, potassium, titanium, barium, zirconium, Zinc, lead,
Arsenic, magnesium, strontium, cerium, selenium, iron, cobalt, nickel, manganese, molybdenum,
It may contain chromium or the like.

The content of the conductive metal oxide with respect to the above-mentioned glass component is in the range of 0.1 to 25% by weight,
Desirably, the range of 0.5 to 10% by weight is suitable.
When the content of the conductive metal oxide exceeds 25% by weight, the degree of freedom of the content ratio of the glass constituent components is reduced, so that a disadvantage such as losing the original characteristics of glass required as a lens material may be caused. When the content of the conductive metal oxide is 0.
If the amount is less than 1% by weight, the function of shielding radiation and electromagnetic waves and the conductivity are not sufficiently exhibited.

[0017]

FIG. 1 is a side view showing a lens according to a first embodiment of the present invention.

The lens 10 of this embodiment is made of SiO ₂
1.8% by weight, 13.3% by weight of Na ₂ O, 8.8% by weight of CaO, 3.5% by weight of MgO, 0.8% of K ₂ O
% By weight, 1.7% by weight of Al ₂ O ₃ , and 0.1% by weight of Fe ₂ O ₃ were added to a glass raw material powder containing conductive zinc oxide (trade name: 23- K) powder (average particle size: 0.1 to 0.25 μm) in 3 to 10% by weight
The powder is heated and melted for 4 hours in an electric furnace preheated to 600 to 1300 ° C., poured out onto a stainless steel plate and gradually cooled to room temperature, and the front and back surfaces are convex. It is obtained by polishing as described above.

As described above, the lens 10 has oxygen permeability by being formed of glass containing conductive zinc oxide (trade name: 23-K) which is one of the conductive metal oxides as a constituent component. Since the heat 11 is efficiently dissipated and absorbed, and quickly assimilate with the outside air temperature at the place where the lens 10 is placed, no fogging due to dew condensation occurs. In addition, since the lens 10 also exhibits conductivity, the lens 10 is not charged with static electricity, and no dust is attracted by charging.

The lens 10 made of such a glass
Is colorless and transparent, has a high transmittance of visible light 12,
It can be used like a conventional lens. Also, unlike conventional surface-coated glass, the lens 10 itself has various functions such as oxygen permeability and conductivity,
No deterioration or deterioration over time due to surface damage occurs, and excellent durability.

Further, this lens 10 made of glass containing a conductive metal oxide is effective against X-rays, α-rays, β-rays, γ-rays, electron beams, and neutron rays, in addition to ultraviolet rays 13 and infrared rays 14. Since it also has a function of shutting off optically, it can be suitably used for optical devices that require such a function.

The lens 10 of the present embodiment is an example, and the present invention is not limited to this. The shape and size of the lens 10 can be arbitrarily determined according to the purpose of use. The composition of the glass constituting 10 can also be changed within the range described above.

FIG. 2 is a view showing a lens of a camera according to a second embodiment of the present invention. Lens 20 of the present embodiment
Is formed of glass having the same composition as the lens 10, and incorporates the lens 20 as a photographic lens of the camera 21. Since the lens 20 has oxygen permeability and conductivity similarly to the lens 10, it is easily assimilated to the outside air temperature and does not carry static electricity. Therefore, there is no fogging of the lens 20 due to dew condensation, and no dust is adsorbed. Also, since the lens 20 blocks ultraviolet rays, infrared rays, etc.,
A photograph that is not affected by these can be taken.
The same effects as described above can be obtained by using a lens formed of glass having the same composition as the lens 20 as the eyepiece and other lenses used in the camera 21.

FIG. 3 is a view showing a spectacle lens according to a third embodiment of the present invention. In the present embodiment, the lens 10
The lens 30 made of glass having the same composition as that of the above is used for the glasses 31. The lens 30 has oxygen permeability and conductivity similarly to the lens 10, and is easily assimilated to the outside air temperature and does not carry static electricity.
No dust is adsorbed. In addition, since the lens 30 shields ultraviolet rays, infrared rays, other harmful radiation and electromagnetic waves, etc., wearing the glasses 31 protects eyes not only in a general living environment but also when viewing a computer display or the like. can do.

FIG. 4 is a view showing a lens of an illumination lamp according to a fourth embodiment of the present invention. In the present embodiment, the lens 1
A lens 40 made of glass having the same composition as 0 is used for an operating room illumination lamp 41. Since the lens 40 has oxygen permeability and is excellent in the heat dissipation function similarly to the lens 10, a large amount of heat generated from the bulb 42 disposed on the back side of the lens 40 is transmitted through the lens 40. Since the heat is efficiently radiated into the atmosphere and the accumulation of heat can be prevented, various adverse effects due to overheating can be avoided. Also, the lens 40
Since it is not charged, it does not adsorb dust in the atmosphere and shields ultraviolet rays harmful to the eyes, so that it is possible to protect the eyes of surgical personnel who use the eyes for a long time. In addition, the lens 40 can be used not only for the operating room lighting lamp 51 but also for various lighting fixtures such as a work light and a search light, and has the same functions and effects as described above.

FIG. 5 is a view showing a panel-type lens according to a fifth embodiment of the present invention. In this embodiment, a panel-type lens 5 made of glass having the same composition as the lens 10 is used.
0 is incorporated in the computer display 51.
The lens 50 also has oxygen permeability similarly to the lens 10,
It has an excellent heat dissipation function, and can efficiently radiate heat generated from the inside of the computer display 51 to the atmosphere via the lens 50, so that the adverse effects due to overheating can be prevented. In addition, since the lens 50 is not charged, it does not absorb dust in the atmosphere and shields ultraviolet rays and electromagnetic waves harmful to eyes and body, so that the health of those who operate the computer for a long time can be maintained. It is valid. Note that the lens 50 can be mounted on a general television screen or the like in addition to the computer display 51, and the same effects as described above can be obtained.

[0027]

According to the present invention, the following effects can be obtained.

(1) By forming a lens with a conductive glass containing a conductive metal oxide as a constituent,
Since the lens itself expresses oxygen permeability and dissipates and absorbs heat, and assimilate quickly with the outside air temperature,
Condensation and heat buildup do not occur, and at the same time, conductivity is also exhibited.
In addition, since the glass itself has oxygen permeability and conductivity, there is no deterioration or deterioration with time due to surface damage, and the glass has excellent durability.

(2) The electric conductivity of the conductive glass is 1
By setting it to 0 ^-3 to 10 ^-8 s / m, the function of preventing condensation, electrification and heat buildup can be effectively exerted without losing the inherent properties of glass.

(3) By forming a lens using a glass containing any one of conductive zinc oxide, conductive tin oxide, and tin-doped indium oxide as a conductive metal oxide, if only ultraviolet rays and infrared rays are used, , X-ray,
It exhibits the function of blocking α-rays, β-rays, γ-rays, electron beams, and neutron rays, and also increases the conductivity of the lens itself.

(4) By forming a lens with glass containing conductive zinc oxide containing 0.5 to 10% by weight of aluminum, X-rays, α-rays, β-rays, γ-rays,
The function of shielding electron beams and neutron beams is enhanced.

(5) By setting the content of the conductive metal oxide to the glass component in the range of 0.1 to 25% by weight, oxygen permeation can be achieved without losing the inherent characteristics of glass required as a lens material. Properties, conductivity, and a shielding function against radiation and electromagnetic waves.

[Brief description of the drawings]

FIG. 1 is a side view showing a lens according to a first embodiment.

FIG. 2 is a diagram illustrating a lens of a camera according to a second embodiment.

FIG. 3 is a diagram illustrating a lens of spectacles according to a third embodiment.

FIG. 4 is a diagram illustrating a lens of an illumination lamp according to a fourth embodiment.

FIG. 5 is a diagram illustrating a panel-type lens according to a fifth embodiment.

[Explanation of symbols]

 10, 20, 30, 40, 50 Lens 11 Heat 12 Visible Light 13 Ultraviolet 14 Infrared 21 Camera 31 Glasses 41 Operating Room Light 42 Light Bulb 51 Computer Display

Continued on the front page (72) Inventor Haruki Kato 1-1-45, Ohara, Ibaraki-shi, Osaka Prefecture No. 303, Lesente Mimihara (72) Inventor Seijiro Yamabe 1077-171, Tateiwa, Iizuka-shi, Fukuoka F-term (reference) 4G062 AA04 BB01 DA06 DA07 DB01 DB02 DB03 DC01 DD01 DE02 DE03 DE04 DF01 EA01 EB04 EC01 EC02 EC03 ED01 ED02 ED03 EE03 EE04 EF01 EG01 FA01 FB01 FC01 FD01 FE02 FE03 FE04 FF01 FG01 FH01 FJ01 FK01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 H01 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM02 MM03 NN24

Claims (5)

[Claims] 1. A lens formed of a conductive glass containing a conductive metal oxide as a constituent. 2. The conductive glass has an electric conductivity of 10 ^−3.
2. The lens according to claim 1, wherein the lens speed is 10 ^-8 s / m. 3. The lens according to claim 1, wherein the conductive metal oxide is one of conductive zinc oxide, conductive tin oxide, and tin-doped indium oxide. 4. The method according to claim 1, wherein the conductive metal oxide is 0.5 to 10
The lens according to claim 1, which is a conductive zinc oxide containing aluminum by weight. 5. The lens according to claim 1, wherein the content of the conductive metal oxide is 0.1 to 25% by weight of the glass raw material.