JPH0714509U - Front lens for halogen bulb with reflector - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to eliminate the wrinkles and traces of cutting blades on the front lens for a halogen bulb with a reflector, and to eliminate the effects on the appearance of the lens and the irradiation light that passes through the front lens. [Structure] In a front lens for a halogen light bulb with a reflecting mirror, at least one side of a glass lens surface is partially or entirely provided with a pattern having an uneven lens surface shape. [Effect] By applying a pattern that makes the lens surface shape uneven on the entire surface or part of the lens surface, it is possible to widen or narrow the light distribution angle of the irradiation light, and wrinkles on the lens surface or traces of cutting blades. It is possible to eliminate the shadow of the projection surface of the irradiation light that has passed through the front lens due to the above. Among them, with a satin pattern, it is possible to make it difficult to see the traces of the cutting blade that are formed because the molten glass is molded using a glass gob that has been cut into a certain size directly by the cutting blade. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a front lens for a halogen bulb with a reflector.

[0002]

[Prior art]

 Conventionally, a front lens for a halogen light bulb with a reflector (hereinafter referred to as a front lens) has been manufactured by using glass or plastic as a material. However, the front lens made of plastic material is inferior to the glass material in heat resistance due to the heat rays irradiated simultaneously with the irradiation light of the halogen bulb. Even if a dichroic mirror is used for the reflector, this deteriorates the durability due to the heat rays directly emitted from the arc tube to the front lens. From these points, borosilicate glass having a low coefficient of thermal expansion has been used for the front lens.

Regarding the production of this glass front lens, in order to improve productivity, continuous press molding was carried out by using a cutting blade to form a molten glass ingot so that a fixed amount of molten glass was obtained. The front lens has a size of φ35 mm to φ90 mm that matches the shape of the opening of the halogen bulb. Every time the diameter of the front lens to be manufactured is changed, the diameter of the orifice, the size of the cutting blade, I was changing the index time etc. The shape of the front lens was transparent and smooth.

[0004]

[Problems to be solved by the device]

 For the front lens, borosilicate glass is used because the halogen bulb becomes hot when it is turned on. Since this borosilicate glass has a high melting and forming temperature, there is a large difference in temperature from the cutting blade, and since many front lenses for halogen bulbs are small as described above, the gob weight is light, especially those with a diameter of less than φ50 mm. Then, traces of the cutting blade often remain on the molding surface of the product. In particular, the front lens described above is manufactured so that the lens surface is smooth, so that stains such as wrinkles on the lens surface and marks on the cutting edge caused by continuous press molding of molten glass conspicuous It didn't look good at all.

In addition, due to wrinkles on the lens surface, traces of cutting blades, etc., when a halogen bulb was irradiated, a shadow was formed on the projection surface of the irradiation light, and the projection object could not be lighted up cleanly.

The present invention has been made in consideration of the above circumstances, and it is possible to eliminate the wrinkles of the front lens and the traces of the cutting blade to eliminate the influence on the appearance of the lens and the irradiation light passing through the front lens. To aim.

[0007]

[Means for Solving the Problems]

 In order to solve the problem, the present invention provides a front lens for a halogen light bulb with a reflecting mirror, in which at least one side of a glass lens surface is provided with a pattern in which the surface shape of the lens is uneven. .

[0008]

[Action]

 By providing a pattern on the lens surface that makes the lens surface uneven, wrinkles on the lens surface and marks such as cutting blade marks can be made inconspicuous.

The pattern in which the lens surface shape of the present invention is uneven means a satin pattern, a line pattern, and a prism pattern. The prism pattern is, for example, a pattern in which a plurality of concave or convex curves are continuously provided on the lens surface, or the lens has a sawtooth cross section.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

The front lens of the present invention is made of borosilicate glass, and is continuously molded by press molding with one lens surface being a convex surface and the other lens surface being a concave surface. By forming the lens surface into two types, a convex surface and a concave surface, the molten glass moves smoothly toward the edge when press-molding the molten glass, improving the formability of the front lens. . This continuous molding is to press-mold by directly feeding a glass gob, which is obtained by directly cutting a molten glass into a certain size with a cutting blade, to a molding die at regular intervals. Most of the patterns on the lens surface were formed by processing the mold. However, only the satin pattern 3 can be formed by a dry honing device using various abrasives as a honing material after molding the front lens.

The halogen bulb using the front glass of this embodiment has a rating of 12 V / 75 W, a total length of 45 mm, an aperture of 50 mm, a beam opening angle of 14 °, a central luminous intensity of 11,500 cd, and a life of 4000 h. The lamps are used for general indoor lighting, store lighting for butty / precious metal stores / perishable foods, exhibition lighting for events, art museums, etc.

FIG. 1 shows that a satin pattern 3 is applied to the entire lens inner surface 2 (hereinafter referred to as the lens inner surface 2) when a front lens is attached to the opening of the reflector.

In contrast to FIG. 1, FIG. 2 shows the entire lens outer surface 1 (hereinafter, referred to as the lens outer surface 1) when the front lens is mounted, with a satin pattern 3.

The satin finish pattern 3 of these two examples is applied to either one of the lens surfaces when the satin finish pattern 3 is formed on the upper mold or the lower mold of the mold or after the front lens is press-molded by a dry honing device. The matte pattern 3 is formed in either or both cases. By providing the satin pattern 3 on the lens surface, it is possible to make it difficult to see wrinkles on the lens surface, traces of the cutting blade, and the like. Further, the irradiation light is transmitted through the satin pattern 3 on the lens surface, so that the light distribution angle is widened, and the shadow of the projection surface of the irradiation light transmitted through the front lens due to wrinkles, marks of cutting blades, etc. can be eliminated. The light distribution angle differs depending on the method of forming the satin pattern 3. When the matte pattern 3 is formed by the former method described above, the mold release property between the glass and the mold must be taken into consideration, and therefore the matte pattern 3 formed on the mold cannot be deeply etched. Therefore, when the satin pattern 3 is formed by the mold, the light distribution angle is increased by only about 2 °. When the matte pattern 3 is formed by the latter method, the light distribution angle can be increased by about 20 ° by setting the depth of the matte pattern 3 to 10 μm to 50 μm.

In FIG. 3, a satin pattern 3 is formed on the outer peripheral portion of the lens inner surface 2 between the center of the lens inner surface 2 and the radius of the lens inner surface 2 and a circle having a radius shorter than the radius of the lens inner surface 2. It has been given.

FIG. 4 shows that the satin pattern 3 is applied within a circle having a radius shorter than the radius of the lens inner surface 2 from the center of the lens inner surface 2.

In FIG. 5, the center of the inner surface 2 of the lens and the center of the hexagon formed on the inner surface 2 of the lens coincide with each other, and the satin pattern 3 is applied to the hexagon accommodated in the inner surface 2 of the lens.

FIG. 6 shows that the hexagonal portion of FIG. 5 on the inner surface 2 of the lens is a smooth surface 4 and the satin pattern 3 is applied to the portion other than the hexagonal portion.

In these four examples, the satin pattern 3 and the smooth surface 4 on the inner surface 2 of the lens are 0.2 to 0. A distinction is made by forming a 3 mm step. One of the methods for forming the satin finish pattern 3 in these examples is to form the satin finish pattern 3 in the upper mold and press-mold the molten glass in the same manner as in the above-described embodiments of FIGS. This is a case where the satin pattern 3 is formed by using the dry honing device as in the embodiment of FIGS. 1 and 2 described above. However, in the latter case, the satin pattern 3 and the smooth surface 4 are formed on the same surface portion, and therefore the smooth surface 4 was dry-honed by being covered with a member that can withstand dry honing. In the embodiment of FIGS. 3 and 6, since the central portion is a smooth surface, the central luminous intensity maintains the same brightness as the conventional one, and the outer peripheral portion of the lens inner surface 2 has a satin pattern 3 to diffuse the light. This is effective when it is not desired to clarify the contour portion of the projected surface. In the embodiment shown in FIGS. 4 and 5, the outer peripheral portion of the lens inner surface 2 is a smooth surface, so that the contour of the light projecting surface is clear, which is effective when used for spotting. The figures on the lens surface formed in these examples may have any shape.

FIG. 7 shows a line pattern or a prism pattern formed on the entire inner surface 2 of the lens at equal intervals.

FIG. 8 is a diagram in which a satin pattern 3 is added to the entire inner surface 2 of the lens of FIG.

The line pattern or prism pattern of these two examples is obtained by pressing a molten glass formed in an upper mold. The satin finish pattern 3 in FIG. 8 may be formed in the same manner as in the above-described embodiment by forming the satin finish pattern 3 on the upper mold to form the front lens, or may be formed after the front lens is formed by the dry honing device.

In the embodiment of FIG. 7, since the irradiation light is scattered by the pattern on the lens surface by applying the line pattern or the prism pattern 5, the front lens due to wrinkles on the lens surface or traces of cutting blades is used. It is possible to eliminate the shadow of the projected surface of the transmitted irradiation light. In the embodiment of FIG. 8, by providing the satin pattern 3 in the embodiment of FIG. 7, in addition to the effect of FIG. 7, it is possible to make wrinkles on the lens surface, traces of the cutting blade, etc., less visible.

In the embodiment of FIG. 7, it is effective to use it when it is desired to diffuse the light only in the direction perpendicular to the line or the boundary line of the prism. The embodiment shown in FIG. 8 is effective when the above-mentioned vertical light diffusion is emphasized and it is desired to slightly diffuse the light in the boundary line direction of the line or prism.

Here, since the front glass used in this embodiment has no vertical or horizontal directional property, the above-mentioned line pattern or prism pattern 5 is used in the direction in which the irradiation light is to be diffused and the vertical direction. Or it can be installed so that the boundary line of the prism is located.

In FIG. 9, the entire inner surface 2 of the lens is provided with a line pattern or prism pattern 5 so as to form a lattice pattern.

FIG. 10 shows that the satin pattern 3 is added to the entire inner surface 2 of the lens of FIG.

The lattice-shaped line pattern or prism pattern 5 of these two examples is obtained by press-molding molten glass formed in the upper mold. The satin finish pattern 3 of FIG. 10 may be formed by forming the satin finish pattern 3 on the upper mold to form a front lens as in the above-described embodiment, or may be formed after the front lens is formed by a dry honing machine.

In the embodiment of FIG. 9, since the line pattern or the prism pattern 5 is applied in a lattice pattern, the irradiation light is scattered by the pattern on the lens surface, so that wrinkles on the lens surface and cutting edges It is possible to eliminate the shadow of the projection surface of the irradiation light that has passed through the front lens due to marks and the like. In the embodiment of FIG. 10, by providing the satin pattern 3 in the embodiment of FIG. 9, in addition to the effect of FIG. 9, wrinkles on the lens surface, traces of the cutting blade, etc. can be made less visible.

The embodiment of FIG. 9 is effective when used to diffuse light in two directions perpendicular to the two types of line patterns or prism patterns 5. The embodiment of FIG. 10 can cover directions other than the above two directions, which were not significantly affected by the diffusion of the line pattern or the prism pattern 5.

FIG. 11 shows a prism pattern 6 formed equiangularly from the center of the lens inner surface 2 toward the outer periphery of the lens inner surface 2.

FIG. 12 shows that the satin pattern 3 is added to the entire inner surface 2 of the lens of FIG.

The radial prismatic patterns 6 of these two examples are obtained by press-molding molten glass formed in an upper mold. The satin finish pattern 3 of FIG. 12 may be formed by forming the satin finish pattern 3 on the upper mold to form the front lens as in the above-described embodiment, or may be formed after the front lens is formed by the dry honing device.

In the embodiment shown in FIG. 11, since the prism pattern 6 is provided radially, the irradiation light is scattered by the pattern on the lens surface, so that the front lens due to wrinkles on the lens surface or traces of the cutting blade, etc. It is possible to eliminate the shadow of the projection surface of the irradiation light transmitted through the. In the embodiment of FIG. 12, by providing the satin pattern 3 in the embodiment of FIG. 11, in addition to the effect of FIG. 11, it is possible to make wrinkles on the lens surface, traces of the cutting blade, and the like less visible.

FIG. 13 shows a case where concentric Fresnel patterns 7 having different radii are formed on the outer surface 1 of the lens from the center of the lens.

In FIG. 14, the Fresnel pattern 7 similar to that in FIG. 13 is provided on the inner surface 2 of the lens.

The Fresnel pattern 7 of this example is formed in either one of the upper mold and the lower mold, and a front lens is obtained by press molding molten glass. When this Fresnel pattern 7 is formed in an upper mold, the relationship between the inner disk and the outer circle of this disk is that the inner disk is closer to the outer circumference than the outer circumference of the circle. 0. It draws an arc that goes down by 5 to 0.7 mm. Below, a similar relationship is established between the inner donut-shaped disc and the outer circle of this donut-shaped disc. When the Fresnel pattern 7 is formed in the lower mold, the arc is drawn so as to rise by 0.5 to 0.7 mm, contrary to the above case.

In the embodiment of FIGS. 13 and 14, since the Fresnel pattern 7 is provided on the lens surface, the irradiation light is diffused or converged by the pattern of the lens, so that wrinkles on the lens surface or traces of cutting blades It is possible to eliminate the shadow of the projection surface of the irradiation light that has passed through the front lens due to such things as.

Further, the Fresnel pattern 7 of FIG. 13 is of a type that diffuses light and is effective when used when it is desired to illuminate a wide range. The Fresnel pattern 7 of FIG. 14 is effective when it is a type that converges light and only a narrow range is desired to be irradiated.

Therefore, by forming the satin pattern 3 on the lens surface, it is possible to make it difficult to see the wrinkles and the marks of the cutting blade that are formed when the glass gob is cut, and it is possible to widen the light distribution angle. Particularly, in the satin pattern 3 formed on the lens surface after molding the front lens by the dry horning device, the light distribution angle can be widened by about 20 °. Also, by forming a line pattern or prism pattern 7 in consideration of the shape of the pattern and the refractive index of the glass, the projection surface of the irradiation light that has passed through the front lens due to wrinkles on the lens surface or traces of the cutting blade. The shadow of can be eliminated.

Since the front lens of the present invention uses a halogen lamp in which a halogen light bulb having a high central luminous intensity is incorporated as a light source, even if the front lens has a satin pattern 3 or the like, it is the same as a conventional one. It is possible to obtain the central luminous intensity unchanged from light sources other than halogens of various sizes.

[0043]

[Effect of device]

 According to the present invention, the entire surface or a part of the lens surface is patterned so that the lens surface shape becomes uneven, so that the distribution angle of the irradiation light can be widened or narrowed, and wrinkles or cuts on the lens surface can be achieved. It is possible to eliminate the shadow of the projection surface of the irradiation light that has passed through the front lens due to blade marks and the like. Among them, with a satin pattern, it is difficult to see the traces of the cutting blade that are formed because the molten glass is directly formed by using a glass block cut into a certain size by the cutting blade. it can.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing another embodiment of the present invention.

FIG. 3 is a conceptual diagram showing another embodiment of the present invention.

FIG. 4 is a conceptual diagram showing another embodiment of the present invention.

FIG. 5 is a conceptual diagram showing another embodiment of the present invention.

FIG. 6 is a conceptual diagram showing another embodiment of the present invention.

FIG. 7 is a conceptual diagram showing another embodiment of the present invention.

FIG. 8 is a conceptual diagram showing another embodiment of the present invention.

FIG. 9 is a conceptual diagram showing another embodiment of the present invention.

FIG. 10 is a conceptual diagram showing another embodiment of the present invention.

FIG. 11 is a conceptual diagram showing another embodiment of the present invention.

FIG. 12 is a conceptual diagram showing another embodiment of the present invention.

FIG. 13 is a conceptual diagram showing another embodiment of the present invention.

FIG. 14 is a conceptual diagram showing another embodiment of the present invention.

FIG. 15 is a conceptual cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 ... Lens outer surface 2 ... Lens inner surface 3 ... Pear-skin pattern
4 ... Smooth surface 5 ... Line pattern or prism pattern 6 ...
Prism pattern 7 ... Fresnel pattern

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[Procedure amendment]

[Submission date] January 21, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

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[Figure 9]

[Figure 10]

FIG. 11

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Claims (1)

[Scope of utility model registration request] 1. A front lens for a halogen light bulb with a reflector, wherein the whole or a part of at least one side of the glass lens surface is provided with a pattern having an uneven lens surface shape. Front lens for light bulbs.