JP2003171142A - Barium silicate glass, lamp and electron tube product, and illuminator equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide lead-free barium silicate glass which has excellent ultraviolet cuttability, solarization resistance, and light transmissivity, and to provide lamp and electron tube products, and an illuminator equipment obtained by using the same. <P>SOLUTION: The barium silicate glass has a composition containing, by mass, 60 to 75% SiO<SB>2</SB>, and 1 to 5% Al<SB>2</SB>O<SB>3</SB>, in which the contents of SO<SB>3</SB>and Sb<SB>2</SB>O<SB>3</SB>are respectively controlled in ≤0.05%, CeO<SB>2</SB>in ≥0.3%, and Fe<SB>2</SB>O<SB>3</SB>in ≤0.03%. CeO<SB>2</SB>cuts ultraviolet rays, and also works as a refining agent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to barium silicate glass, a tube product using the same, and a lighting device.

[0002]

2. Description of the Related Art In tube products such as fluorescent lamps and incandescent lamps, in order to keep the internal operating elements airtight with respect to the outside air and to guide the light generated from the operating elements to the outside with as little loss as possible, An actuating element is enclosed inside a light-tight container. In the translucent airtight container, soda lime glass, that is, barium silicate glass, which has a high light transmittance and is inexpensive, is used at least in its main part. Further, the translucent airtight container is generally provided with a stem for supporting an actuating element to be sealed inside and airtightly penetrating an introduction wire for supplying power to the actuating element from the outside. However, conventionally, lead glass has often been used for the stem with emphasis on workability and electrical characteristics.

On the other hand, as the social situation for the environment is becoming more severe, it is required to reduce the lead component as a harmful substance. In addition, the following matters are regarded as problems as the harmfulness of lead contained in glass used in tube products. (1) Soil pollution at the time of disposal, (2) Harmful to the working environment due to volatilization of lead components in the lead gas manufacturing process, (3) Volatilization of lead components in the high temperature melting process of glass in the tube product manufacturing process Hazard on work environment, (4)
Inconsistent glass materials at the time of recycling, deterioration of recyclability due to mixing of harmful substances, and (5) Environmental hormone candidate substance Soft glass that does not contain lead has been proposed in the past. For example, in Japanese Patent Laid-Open No. 6-206737,
Glass compositions free of harmful PbO, F, Sb ₂ O ₃ , As ₂ O ₃ are described. JP-A-9-12332
The publication describes a glass composition which does not contain PbO and is reduced in BaO, which tends to cause devitrification, when stem glass is formed by the Danner method. JP-A-6-92677 discloses a glass composition which does not contain PbO and which contains Fe ₂ O ₃ , TiO ₂ and CeO ₂ in a predetermined amount to improve the solarization resistance and the ultraviolet blocking property. Is listed. JP-A No. 11-224649 describes a glass composition for reducing the amount of mercury consumed by glass and reducing the amount of enclosed mercury.

[0004]

By the way, barium silicate glass used for tube products has good electrical characteristics, softening temperature, thermal expansion characteristics, mechanical strength, and chemical stability, and particularly, the drawbacks of lead-free glass. It is desired that the problems of the ultraviolet blocking property, the solarization resistance and the light transmittance which are the above are overcome.

However, according to the study by the present inventors, this type of glass of the prior art does not completely overcome the main problems of lead-free glass, although it may partially satisfy the above problems. .

It is an object of the present invention to provide a barium silicate glass which is lead-free and is excellent in ultraviolet ray blocking property, solarization resistance and light transmittance, a bulb product and a lighting device using the barium silicate glass.

The present invention also provides barium silicate glass having good electrical characteristics, softening temperature, thermal expansion characteristics, mechanical strength and chemical stability, a bulb product using the same, and a lighting device. Other purposes.

[0008]

The barium silicate glass of the present invention according to claim 1 is, by mass%, SO ₃ and Sb ₂ O ₃ in respective amounts of 0.05% or less, CeO ₂ of 0.3% or more, In addition, Fe ₂ O ₃ is characterized by being 0.03% or less.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

Barium silicate glass is a soft glass generally called soda lime glass, and if the range of the content ratio of the main components is specifically shown by mass%, it is as follows. However, lead Pb is essentially not included. In addition, "essential" means that the degree of containing an extremely small amount of Pb as much as an impurity does not deviate from the object of the present invention, and is therefore acceptable. In addition, SO ₃ , Sb ₂ O ₃ ,
CeO ₂ and Fe ₂ O ₃ are as defined above.

SiO ₂ 60-75% Al ₂ O ₃ 1-5% Li ₂ O 1-5% Na ₂ O 5-10% K ₂ O 1-10% CaO 0.5% or more Next, SO ₃ , Sb ₂ O ₃ , CeO ₂ and Fe ₂ O ₃
Will be described.

SO ₃ and Sb ₂ O ₃ are substances generally used as a fining agent for glass, and have a function of removing bubbles in the molten glass to clarify the glass. SO ₃ is
It exhibits a reducing and clarifying action, and Sb ₂ O ₃ exhibits an oxidizing and clarifying action. However, SO ₃ is an iron oxide (Fe ₂ O ₃ , Fe
In the present invention, it is preferable not to contain it, and even if it is contained, if it is regulated to 0.05% by mass or less, the light transmission of the glass decreases. The rate decrease can be kept within an acceptable range. On the other hand, Sb ₂ O ₃ is CeO ₂
In combination with the cause of solarization by ultraviolet rays, as a result the transmittance of the glass decreases during the life, in the present invention, it is better not to contain,
Even if it is contained, if it is regulated to 0.05% by mass or less, the decrease in transmittance due to solarization can be maintained within an allowable range.

CeO_TwoIs an ultraviolet ray added to the glass.
It is well known as an agent, but in the present invention, CeO_Two
To 0.3% by mass or more
Therefore, it also acts as a fining agent in the molten glass state,
Improve the transparency of glass. That is, CeO_TwoIs
Ce improves the UV protection of the glass _Two
O_ThreeAnd has a clarification effect.

[0014] _Fe 2 _{O 3} is, Fe ₂ present in the glass
The variables of O ₃ and FeO are comprehensively shown, and the contents are values converted to Fe ₂ O ₃ . Fe ₂ O ₃ and FeO supply Fe ions into the glass, and as a result, the visible light or near-infrared absorption amount increases, so that the transmittance on the long wavelength side in the visible light region tends to decrease. In addition, when Fe ions increase in barium silicate glass, the glass becomes blue and the ultraviolet transmittance increases,
The amount of transmission of ultraviolet rays increases, and the ultraviolet cut property deteriorates. For these reasons, Fe ₂ O is used in the present invention.
₃ is preferably not contained, and even if it is contained, if it is regulated to 0.03 mass% or less, the decrease in visible light transmittance can be maintained within an allowable range.

Since the barium silicate glass of the present invention has the above-mentioned structure, it absorbs less infrared light, and thus prevents the transmittance from decreasing on the long wavelength side in the visible light region. The transmittance characteristic is uniformly increased over the entire visible light region, and C
Since eO ₂ has an ultraviolet absorbing property, the amount of ultraviolet radiation is reduced. Therefore, even if the content of Fe2O3 is 0.03 mass% or less, it is possible to reduce the ultraviolet radiation amount and obtain a high visible light transmittance.

Further, since the decrease in transmittance due to solarization in the conventional barium silicate glass using Sb ₂ O ₃ as a fining agent is suppressed, the solarization resistance is improved.

Further, the inclusion of CeO ₂ improves the UV absorption of the glass, and thus improves the UV blocking property of the glass.

Therefore, the barium silicate glass of the present invention has the above-mentioned effects and has a softening point of 67.
Since α (× 10 ⁻⁷ ) at 5 ° C. is 94 centers, it is suitable for tube products, especially for lighting tube products. However, the application is not limited to tube products.

The barium silicate glass according to the second aspect of the present invention contains SiO _{2 of} 60 to 75%,
1 ₂ O ₃ 1-5%, Li ₂ O 1-5%, Na ₂ O
5 to 10%, K ₂ O 1 to 10%, CaO 0.5 to, SO ₃ and Sb ₂ O ₃ are each 0.05% or less, CeO ₂ is 0.3% or more, and Fe ₂ O. ₃ is 0.
It is characterized by being at most 03%.

The present invention defines the range of the content of the main component of barium silicate glass. Hereinafter, each component will be described.

SiO ₂ is the main constituent of glass formation,
If it is less than 60%, it is not possible because the strength of glass is chemically and physically reduced. On the other hand, if it exceeds 75%, the softening temperature becomes high, which is not possible.

Al ₂ O ₃ imparts chemical durability, but if it is less than 1%, it is not possible because sufficient chemical durability cannot be obtained. On the other hand, if it exceeds 5%, the viscosity becomes too high at high temperature, which is not possible.

Li ₂ O lowers the melting temperature and improves the workability, but if it is less than 1%, a sufficient effect cannot be obtained, which is not possible. On the other hand, if it exceeds 5%, the thermal expansion coefficient becomes too small, which is not possible.

Na ₂ O has a function of lowering the viscosity of glass and can lower the melting, molding and processing temperatures, but if it is less than 5%, a sufficient effect cannot be obtained, so that it is not possible. Further, if it exceeds 10%, the viscosity of the glass becomes excessively low and the thermal expansion coefficient becomes too large, which is not possible.

K ₂ O has the effect of lowering the viscosity of the glass, can lower the melting, molding and processing temperatures and can impart gloss to the glass, but if it is less than 1%, a sufficient effect cannot be obtained. , Is not possible. If it exceeds 10%, the viscosity of the glass tends to be too low, which is not possible.

CaO lowers the viscosity of the glass during melting, increases the viscosity at the temperature during processing, and accelerates the rate of hardening, but if it is less than 0.5%, a sufficient effect cannot be obtained, which is not possible. Further, if it exceeds 5%, the tendency to devitrify the glass becomes strong, and if it exceeds 10%, this tendency becomes stronger. Therefore, it is preferably 10% or less, and more preferably 5% or less.

MgO lowers the viscosity of the glass during melting, accelerates the rate of hardening during processing, and reduces the coefficient of thermal expansion, but if it is less than 0.5%, a sufficient effect cannot be obtained.
It is impossible. Further, if it exceeds 5%, the glass tends to be devitrified, which is not possible.

SrO improves the hardness and chemical durability of glass, but if it is less than 0.5%, a sufficient effect cannot be obtained, so it is not possible. On the other hand, if it exceeds 10%, the tendency to devitrify the glass increases, which is not possible.

BaO lowers the viscosity of the glass even if the content of the alkali component is reduced, but if it is less than 0.5%, a sufficient effect cannot be obtained, so BaO is not possible. On the other hand, if it exceeds 7%, bubble breakage becomes worse and the working temperature range becomes narrower.

Thus, in the present invention, a barium silicate glass having a high visible light transmittance, a good solarization resistance and a good ultraviolet cutoff property, and therefore suitable for a bulb product, particularly a bulb product for lighting, is obtained. To be However, the application is not limited to tube products.

The barium silicate glass according to the invention of claim 3 is characterized in that, in the barium silicate glass according to claim 2, R ₂ O is larger than RO. However, R ₂ O is the total mass of alkaline earth metal oxides, RO
Is the total weight of alkali metal oxides.

According to the present invention, the provision of the above structure suppresses the tendency of mercury to form amalgam with Na in the glass and consumes mercury, and also suppresses the damage of the phosphor by the glass. As a result, the luminous flux maintenance factor is improved. Therefore, the barium silicate glass of the present invention is suitable for tube products using mercury vapor as an operating element, particularly low-pressure mercury vapor discharge lamps such as fluorescent lamps.

In addition to the above range, SrO / Ba
When O ≧ 1.5 and when the conditions of MgO + BaO ≦ SrO are satisfied, the barium silicate glass has an appropriate electronegativity and thus exhibits a suitable mercury adsorption property. Therefore, when the barium silicate glass of the present invention is used to form the translucent discharge vessel of the low-pressure mercury vapor discharge lamp, the luminous flux rising characteristics are improved.

The tube product of the invention of claim 4 is a translucent airtight container mainly composed of the barium silicate glass according to any one of claims 1 to 3, and is sealed inside the translucent airtight container. And an actuating element which is provided.

In the present invention, the "tube product" is a concept including all products in which an operating element is sealed in a light-transmitting airtight container, and the operating element is operated by electric energy and other energy. It may be any that operates. In the case of an actuating element that is actuated by electrical energy, the actuating element may be biased via a lead-in line that penetrates the translucent airtight container in a gastight manner, or non-conductingly, such as electromagnetically or electrostatically Good. Further, in the present invention, a suitable tube product is a lighting tube product.
"Illumination bulb product" means a bulb product in which the actuating element emits light and is intended to utilize that emission for illumination. The lighting bulb product may be, for example, an incandescent lamp or a discharge lamp.

As the incandescent lamp, any incandescent lamp may be used as long as it is possible to form the translucent airtight container by using soft glass such as an incandescent lamp for general lighting. Further, as the discharge lamp, for example, a low pressure mercury vapor discharge lamp and a low pressure rare gas discharge lamp can be configured. These discharge lamps emit ultraviolet rays by the discharge of the discharge medium enclosed in the transparent airtight container,
Further, if it is configured so as to pass through the transparent airtight container and be led out to the outside, it becomes a sterilization lamp. Further, the phosphor layer is disposed on the inner surface side of the translucent airtight container, which is irradiated with ultraviolet rays to be excited to generate ultraviolet rays or visible light having a wavelength longer than that of the excited ultraviolet rays. If it is configured so as to pass through and be led out to the outside, it becomes a fluorescent lamp. As the fluorescent lamp, it is possible to obtain a fluorescent lamp adapted to various applications depending on the wavelength range of the light emitted from the phosphor.

The light-transmitting airtight container can adopt various shapes and sizes according to the type, volume and use of the tube product. For example, in the case of an incandescent light bulb for general lighting, a PS type bulb shape or the like can be used.
In the case of a fluorescent lamp, various shapes such as a straight tube shape, an annular shape, and a bent shape can be used according to the type of the fluorescent lamp.

Further, in the present invention, at least a part of the translucent airtight container is made of the barium silicate glass according to any one of claims 1 to 3. But,
The actuating element housed inside the translucent hermetic container does not necessarily have to emit light.

Further, the translucent airtight container can be provided with a stem for keeping the operating element housed therein airtight with respect to the outside air and supplying power from the outside. The stem is hermetically pierced by the lead-in wire and can support at least part of the actuating element at the inner end of the lead-in wire. Known flare stems, pinch stems, bead stems, etc. can be appropriately adopted for the stem, and a part of the translucent airtight container is sealed by being sealed to the valve portion that constitutes the main part of the translucent airtight container. I am doing it.

The operating element is an element that operates as a tube product and is housed inside a light-transmitting airtight container.
In addition, at least a part of the actuating element may be housed inside the translucent airtight container. Further, a part or all of the operating element may be a substrate or a gaseous substance. In the case of a bulb product for lighting, in an incandescent light bulb, an incandescent filament, a member that supports the incandescent filament, such as an internal lead-in wire, an anchor, or a sealed gas constitutes an operating element. Further, in the discharge lamp, the discharge generating means such as the electrodes, the gas or vapor as the discharge medium, the phosphor layer and the like constitute the operating elements. The discharge generating means may be arranged outside the translucent airtight container. In such a case, the operating element housed inside the translucent airtight container becomes a part of the whole.

In the present invention, the light-transmitting airtight container is mainly composed of barium silicate glass defined in any one of claims 1 to 3, and has a good UV-cutting property. Even in the case of a tube product in which the container is directly exposed to the outside, there is no problem because the ultraviolet radiation emitted from the actuating element is cut by the airtight container. Therefore, the present invention is particularly suitable for naked-type lighting tube products. However, if necessary, the bulb product may be provided with an envelope so as to surround the translucent airtight container.

A lighting device according to a fifth aspect of the present invention includes a lighting device main body; a tube product according to claim 4, which is disposed in the lighting device main body and accommodates an operating element for emitting light therein; And a tube actuation circuit for urging.

In the present invention, the "lighting device" is a concept that includes all devices that utilize light emission from a tube product containing an actuating element that emits light inside, for example, lighting equipment and display devices. , Indicator light device, backlight device,
Includes readers, floodlights, photoreactors, and the like, as well as equipment incorporating these devices. Examples of equipment incorporating the above-described device include liquid crystal display devices incorporating a backlight device, vehicle-mounted instrument panels, copying machines incorporating a reading device, facsimiles, image scanners, and the like.
A device, an image projection device incorporating a light projecting device, and the like. The "illuminator main body" refers to the remaining portion of the illumination device, excluding the tube product and the tube operating circuit.

The bulb product constitutes a bulb product for illumination such as incandescent bulbs and discharge lamps, eg fluorescent lamps.

The tube actuating circuit is a circuit for energizing the tube product to perform blinking and dimming control. Further, the bulb actuation circuit may be disposed in the lighting device main body, or may be disposed at a position separated from the lighting device main body and electrically connected to the bulb product disposed in the lighting device main body. The connection may be arranged.

[0046]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

Next, the compositions of Examples 1 and 2 and Comparative Examples 1 and 2 of the present invention, their physical properties, and the characteristics of fluorescent lamps equipped with a transparent airtight container formed by using these barium silicate glasses were described. The performance is shown in Table 1. In addition,
Both Comparative Example 1 and Comparative Example 2 correspond to the prior art. Further, the component ratios are all% by mass.

[0048]

Table 1 Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 SiO ₂ 70 70 70 70 Al ₂ O ₃ 1.9 1.9 1.9 1.9 Li ₂ O 1.4 1.4 1 .4 1.4 Na ₂ O 6.4 6.4 6.4 6.4 K ₂ O 8.1 8.1 8.1 8.1 CaO 1.9 1.9 1.9 1.9 MgO 1 0.0 1.0 1.0 1.0 1.0 SrO 5.4 5.4 5.4 5.4 BaO 1.5 1.5 1.5 1.5 1.5 Fe ₂ O ₃ 0.007 0.02 0.03 0.03 CeO ₂ 0.6 0.6 0.3 <0.01 SO ₃ 0.04 0.04 0.3 0 Sb ₂ O ₃ 0.05 0.05 <0.01 0.44 Pb 0 0 0 0 α (10 ⁻⁷ / ° C.) 95 95 94 94 94 Ts (° C.) 676 675 675 675 Initial luminous flux (%) 100 98 97 97 100 ○ ○ ○ × Solarization resistance ◎ ◎ ○ ○ ○ The performance evaluation criteria of the fluorescent lamps shown in the table are as follows.

◎ Better than the current ○ Approximately the current level × Inferior to the current level FIG. 1 shows Example 1 of the barium silicate glass of the present invention.
5 is a graph showing the transmittance characteristics of Example 2 together with those of Comparative Example 1 and Comparative Example 2. In the figure,
The horizontal axis represents the wavelength (nm) in the range of 190 to 760 nm, and the vertical axis represents the transmittance (%). Further, the curve A shows the example 1 of the present invention, the curve B shows the example 2 of the same, the curve C shows the comparative example 1, and the curve D shows the comparative example 2.

The curve A showing the transmittance characteristic of Example 1 is a solid line, and the transmittance rises from a wavelength slightly shorter than 300 nm, and the transmittance is saturated near the wavelength of 380 nm.
It has a transmittance of 90% or more up to a wavelength of 760 nm and a substantially constant transmittance. The curve B showing the transmittance characteristics of Example 2 is a one-dot chain line and is the same as the curve A until it is saturated at a wavelength of about 380 nm, so only a solid line is shown, but the range of wavelengths from 380 to 760 nm is shown. 9 in the saturation region of
It exhibits a high transmittance of 3 to 94%.

On the other hand, the curve C showing the transmittance characteristic of Comparative Example 1 is a dotted line, and the transmittance rises from a wavelength slightly longer than 300 nm, and the transmittance decreases on the long wavelength side of the visible light region. is doing. Further, the curve D showing the transmittance characteristic of Comparative Example 2 is a long dotted line, and the rising of the transmittance includes up to the ultraviolet region and is the same as the solid curve A in the visible light region, so only the solid line is shown. Shows.

2 and 3 show a ring-shaped fluorescent lamp as a first embodiment of the bulb product of the present invention, FIG. 2 is a front view, and FIG. 3 is an enlarged partial cross-sectional front view of a main part. In each figure, 1 is a translucent airtight container, 2 is an operating element, 3 is a base,
Reference numeral 4 is a ring-shaped fluorescent lamp.

The translucent airtight container 1 is formed by using the barium silicate glass of the first or second embodiment of the present invention described above, and is a glass tube 1 curved in a substantially annular shape.
a and the flare stem 1 sealed at both ends of the glass tube 1a
b and. The flare stem 1b includes an exhaust pipe 1b1 and a pair of air-tightly extending lead-ins 1b2. It should be noted that the exhaust pipe 1b1 located on the left side in FIG. 3 is sealed before the translucent airtight container 1 is curved into an annular shape, and the exhaust pipe 1b1 located on the right side is translucent airtight after the curving. The inside of the container 1 is evacuated, the discharge medium is sealed, and then sealed.

The operating element 2 comprises an electrode 2a, a phosphor layer 2b and a discharge medium (not shown). The electrode 2a is composed of a coil filament made of a tungsten wire and an electron emitting substance, and has a flare stem 1
It is connected between the inner ends of the pair of lead-in wires 1b2 of b. The electron emitting substance is applied to the coil filament. The phosphor layer 2b is formed on the inner surface side of the glass tube 1a of the translucent airtight container 1 and uses, for example, a three-wavelength light emitting phosphor. The discharge medium is made of a rare gas such as mercury and argon, and is sealed inside the translucent airtight container 1.

The bases 3 are attached to both ends of the translucent airtight container 1 and straddle them to complete the ring as a whole.

Thus, the ring-shaped fluorescent lamp of this embodiment is of a type exclusively for high-frequency lighting and has the following specifications.

Tube diameter 16.5 mm, inner diameter 340 mm, outer diameter 373 mm, base G10q, rated lamp power 34 W, initial characteristic rated lamp current 0.23 A Id 48 W, Id 0.43 A FIG. It is a front view which shows the bulb-shaped fluorescent lamp as 2nd Embodiment of a spherical product. In the figure, 4 is a fluorescent lamp, 5 is a base, and 6 is a base.

The fluorescent lamp 4 has a translucent airtight container 4a and an operating element like the fluorescent lamps shown in FIGS. 2 and 3, but the translucent airtight container 4a is compactly curved. There is. That is, the translucent airtight container 4a
Consists of Example 1 or Example 2 of the barium silicate glass of the present invention, and three U-shaped glass tubes having an outer diameter of 10 mm are connected by two connecting tubes to form one bent discharge path. In addition, each U-shaped glass tube is evenly arranged on the imaginary circumference and is arranged so as to be located on each side of the equilateral triangle, thus forming a compact shape as a whole.
The connecting pipe portion is inside the base body 5. In addition, each U-shaped glass tube has pinch seal portions formed at both ends thereof, and each thin tube projects outward from one pinch seal portion. At the time of forming the pinch seal portion, a planned portion of the pinch seal and a portion in the vicinity thereof of a protective film and a phosphor layer which are previously formed on the inner surface of the U-shaped glass tube are peeled off to facilitate glass processing. The thin tube communicates with the inside of the translucent discharge vessel 4a. The thin tube is used when exhausting the inside of the translucent discharge vessel 4a, storing the main amalgam, and sealing the rare gas. The connecting pipe is formed by a blow-off method, and the portion where the protective film and the phosphor layer are peeled off at the time of blow-off. The protective film is a thin film made of α-type Al ₂ O ₃ fine particles. The phosphor layer is made of a three-wavelength light-emitting phosphor, and is formed on the protective film, that is, on the inner surface side. The main amalgam is housed in the thin tube of the translucent discharge vessel 4a. The main amalgam is Bi-
It consists of In-Hg. The auxiliary amalgam is made of In, is plated on a stainless steel substrate, and is welded to the internal lead-in wire that supports the electrode. Further, the auxiliary amalgam is U at an intermediate position of the translucent discharge vessel 4a.
It is also welded to and supported by the lead-in wire that penetrates the pinch seal portion of the V-shaped glass tube.

The base body 5 is formed by molding a white light-shielding heat-resistant synthetic resin into a container shape that is divided into upper and lower parts.
The base end 5a is narrowed down and accommodates a high-frequency lighting circuit that constitutes a tube operating circuit. The high-frequency lighting circuit is mainly composed of a half-bridge type inverter, and energizes and lights the fluorescent lamp 4, and its high-frequency output end is connected to the fluorescent lamp 4 as required, as described later. The low-frequency AC input terminal is connected to a base 6 described later. Further, the high frequency lighting circuit includes a wiring board and circuit components mounted on the wiring board.

The base 6 is composed of an E26 type screw base, and is attached to the base end 5a of the base 5 by caulking with a punch. The input end of the high frequency lighting circuit is connected to the center contact of the base 6 and the base shell.

The specifications in this embodiment are as follows. Outer diameter 40 mm, total length 116 mm, cap E26 type, rated input voltage 100 V, rated power consumption 13 W, rated input current 0.23 A FIG. 5 shows a central section of a fluorescent lamp ceiling pendant as an embodiment of the lighting device of the present invention. It is a front view. In the figure, 11 is a lighting device main body, 12, 1
3 is a tube product.

The illumination device main body 11 includes a base 11a. The base body 11a forms a container having a convex curved surface on the lower surface side, and accommodates a high-frequency lighting circuit and an accessory circuit component forming a bulb operating circuit (not shown) inside. The lamp holder 11b is used for the tube products 12, 13
And is mounted on the base body 11a.
The shade 11c is formed by molding a translucent plastic, has an umbrella shape, and is placed on the upper portion of the base 11a. The hanging cord 11d is led out from the upper center of the base 11a, and its length is adjustable.
1a and tube products 12, 13 are suspended. The hooking ceiling cap 21e is connected to the tip of the hanging cord 11d and detachably attached to a ceiling body (not shown) previously arranged on the ceiling so as to be connected to a low-frequency AC power source and to be fluorescent. Mechanically suspends and supports the light ceiling pendant.

The tube products 12, 13 have the structure shown in FIG. 4, but the tube product 13 has different sizes and ratings as shown below.

[0064]   Pipe diameter 16.5 mm, inner diameter 266 mm, outer diameter 299 mm, mouthpiece G10q, Rated lamp power 27W, initial characteristic rated lamp current 0.23A   Same as above 38W, Same as above 0.43A

According to the first aspect of the present invention, each is mass%, SO ₃ and Sb ₂ O ₃ are each 0.05% or less, CeO ₂ is 0.3% or more, and Fe ₂ O _{3 is} Is 0.
When it is at most 03%, it is possible to provide a barium silicate glass that is lead-free and is excellent in ultraviolet blocking property, solarization resistance and light transmittance.

According to the second aspect of the invention, all of them are% by mass.
So, SiO ₂ 60-75%, Al ₂ O ₃ 1-5%,
Li ₂ O 1-5%, Na ₂ O 5-10%, K ₂ O
1 to 10%, CaO 0.5% to, SO ₃ and Sb ₂ O ₃ are each 0.05% or less, and CeO ₂ is 0.
When it is 3% or more and Fe ₂ O ₃ is 0.03% or less, it is possible to provide a barium silicate glass that is lead-free and is excellent in ultraviolet blocking property, solarization resistance and light transmittance.

According to the invention of claim 3, in addition, the total mass R ₂ O of the alkaline earth metal oxide is larger than the total mass RO of the alkali metal oxide, whereby mercury forms Na and amalgam in the glass. Thus, the tendency of consuming mercury is suppressed, the damage of the phosphor by the glass is suppressed, and the luminous flux maintenance factor is improved, so that barium silicate glass suitable for a fluorescent lamp can be provided.

According to the invention of claim 4, it is possible to provide a tube product having the effects of claims 1 to 3.

According to the invention of claim 5, it is possible to provide an illumination device having the effects of claims 1 to 3.

[Brief description of drawings]

FIG. 1 Example 1 of barium silicate glass of the present invention
And a graph showing transmittance characteristics in Example 2 together with those in Comparative Example Comparative Example 2.

FIG. 2 is a front view showing a ring-shaped fluorescent lamp as a first embodiment of a tube product of the present invention.

[FIG. 3] Similarly, an enlarged partial cross-sectional front view of the main part

FIG. 4 is a front view showing a light bulb shaped fluorescent lamp as a second embodiment of the tube product of the present invention.

FIG. 5 is a central cross-sectional front view showing a fluorescent lamp ceiling pendant as an embodiment of a lighting device of the present invention.

[Explanation of reference numerals] A ... Example 1, B ... Example 2, C ... Comparative example 1, D ... Comparative example 2, 1 ... Transparent airtight container, 2 ... Actuating element, 3 ... Base,
4 ... Fluorescent lamp

Continued front page    F-term (reference) 4G062 AA03 BB01 BB03 DA06 DA07                       DB03 DC01 DD01 DE01 DF01                       EA03 EB03 EC03 ED01 EE02                       EF01 EG01 FA01 FB01 FC01                       FD01 FE01 FF01 FG01 FH01                       FJ01 FK01 FL02 GA02 GB01                       GB02 GC01 GD01 GE01 HH01                       HH03 HH05 HH07 HH09 HH11                       HH12 HH13 HH15 HH17 HH20                       JJ01 JJ03 JJ04 JJ05 JJ07                       JJ10 KK01 KK03 KK05 KK07                       KK10 MM24 NN01 NN13 NN34                 5C043 AA20 CC09 DD03 EB15 EC06

Claims (5)

[Claims] 1. SO ₃ and Sb ₂ O both in mass%.
₃ is 0.05% or less, CeO ₂ is 0.3% or more, and Fe ₂ O ₃ is 0.03% or less, barium silicate glass. 2. SiO ₂ 60 to 75
%, Al ₂ O ₃ 1-5%, Li ₂ O 1-5%, Na
₂ O 5-10%, K ₂ O 1-10%, CaO 0.
5% to include SO ₃ and Sb ₂ O ₃ , respectively.
05% or less, CeO ₂ is 0.3% or more, and Fe ₂ O
Barium silicate glass characterized in that ₃ is 0.03% or less. 3. The barium silicate glass according to claim 2, wherein R ₂ O is larger than RO. However, R ₂
O is the total mass of the alkaline earth metal oxides, and RO is the total mass of the alkali metal oxides. 4. A translucent airtight container made of the barium silicate glass according to claim 1, and an actuating element sealed inside the translucent airtight container. Characteristic tube products. 5. The tube product according to claim 4, wherein the lighting device main body is provided in the lighting device main body and accommodates an actuating element for emitting light therein, and a tube actuation circuit for energizing the tube product. When;
An illuminating device comprising: