JPH1131482A - Lamp with reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of glare due to the direct light from a light source by providing a shielding body for preventing the arrival of the direct light from a light emitting part into an area surrounded by a peripheral edge, which regulates an opening of a reflector. SOLUTION: A reflector 14 is formed of glass of the like, and provided with a reflecting film 24 in a surface of the inside thereof, which is formed into a paraboloidal surface or a recessed surface. An upper opening 14b of the reflector 14 is closed by a transparent protecting glass plate 25. A filament 20 is arranged at the nearly focal point of the recessed surface formed by the inside surface of the reflector 14. A lamp 12 is provided with a shielding body 30 for covering a tip of a cylindrical main body 12b, and a rear end of the shielding body 30 is positioned so that the direct light from a rear end of the filament 20 does not arrive to a front side of a circumferential edge 14c of the reflector 14. With this structure, emission of the direct light form the filament 20 outside of the reflector 14 through the protection glass plate 25 is prevented, and generation of glare is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector-equipped light bulb in which a reflector is attached to a light bulb such as a halogen light bulb.
More specifically, the present invention relates to a reflector-equipped light bulb that prevents glare due to direct light from a light source.

[0002]

2. Description of the Related Art A light bulb with a reflector, in which a high-intensity light bulb such as a halogen light bulb is incorporated in a reflector, has a high illuminance and excellent light distribution characteristics, for example, for studio lighting or display of a show window. It is widely used as a light source for lighting and the like.

[0003] By the way, the above-mentioned light bulb with a reflector requires a measure to prevent a so-called glare depending on the application, but a light bulb (ie, an arc tube) which has been subjected to a known anti-glare treatment. Simply using as a light bulb with a reflector has a problem that the loss of illuminance is too large or the light distribution characteristics are deteriorated as a result of the combination with the reflector.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a reflector-equipped light bulb having a reflector integrated with a light bulb. It is an object of the present invention to provide a light bulb with a reflector having a glare prevention structure that can prevent the light distribution characteristic from being reduced and the light distribution characteristic is not deteriorated.

In order to achieve the above object, a light bulb with a reflector according to the present invention is provided with a light bulb fixedly provided in a bowl-shaped reflector, and emits light emitted from a light emitting portion of the light bulb through an opening of the reflector. In a reflector-equipped light bulb that emits to the outside of the reflector, at least a part of the light bulb or the reflector is a region where direct light from the light emitting unit is surrounded by a rim that defines the opening in the reflector. It is characterized in that a light shielding body for preventing the light from reaching the inside is provided.

According to the light bulb with a reflector having the above-described structure, direct light from a light emitting portion such as a filament is not emitted to the outside of the reflector, so that glare is effectively prevented.

In the above-mentioned light bulb with reflector, the bowl-shaped reflector has a concave reflection surface, and the filament is placed at a base end of the light bulb such that the filament is substantially along the optical axis of the concave reflection surface. A generally tubular halogen lamp fixed to the bottom of the reflector, the light shield is provided on the light bulb so as to cover the distal end side of the light bulb for a predetermined distance, and the position of the rear edge of the light shield is set to the position of the filament. The reflector may be located substantially on a line connecting the end on the bottom side of the reflector and the periphery of the reflector.

Further, according to the present invention, in the above-described light bulb with a reflector, the reflector has a bowl-shaped portion forming the concave reflection surface, and a predetermined length from the bowl-shaped portion to the peripheral edge of the reflector. And the rear edge of the cylindrical portion is located on a substantially extended line of a straight line connecting the open side end of the filament and the rear edge of the light shielding body. Good to do.

According to this structure, the light emitted from the filament can be supplied to the parabolic reflection surface to the maximum extent, and the direct light from the filament can be prevented from being emitted outside the reflector. As a result, it is possible to maintain high light quantity and light distribution characteristics and to prevent glare.

Further, as another example of the above configuration, the bowl-shaped reflector has a concave reflecting surface, and the bulb has a filament at a base end thereof substantially along the optical axis of the concave reflecting surface. A generally tubular halogen bulb fixed to the bottom of the reflector, the light shield is provided on the bulb so as to cover the distal end side of the bulb over a predetermined distance, and the reflector is provided from the periphery of the reflector. A cylindrical hood extending over a predetermined distance in the light emission direction along the optical axis, the position of the rear edge of the light shielding body is the opening side end of the filament and the peripheral edge of the reflector. The opening of the hood may be located substantially on a connecting line, and the open end of the hood may be located on a substantially extended line of a straight line connecting the end of the filament on the bottom side of the reflector and the rear edge of the light shield. .

In each of the above embodiments, the light-shielding body is coated with a heat-resistant light-shielding material applied to the front end surface of the light bulb over a predetermined distance in the length direction of the light bulb, or is fitted to the front end of the light bulb. In addition, a cap made of a heat-resistant and light-shielding material having a predetermined length can be obtained.

Further, in the light bulb with reflector according to the present invention, the light shielding body may cover the distal end side of the light bulb for a predetermined distance and may be held on the reflector via support means. In this case, the light-shielding body is a bottomed cylinder made of a heat-resistant and light-shielding material that covers the front end surface of the bulb over a predetermined distance in the length direction of the bulb, and the cylinder is substantially parallel to the length direction of the bulb. The reflector may be attached to the reflector via a predetermined number of columns (for example, metal columns).

According to the present invention, at least a part of the light-shielding body is a transparent body whose surface is subjected to frost processing.
It is composed of a transparent body coated with a translucent or light-scattering coating, or a transparent heat-resistant material containing translucent or light-scattering particles. According to the present invention having this configuration, glare due to direct light from the light emitting section can be prevented, while the amount of light extracted through the opening of the reflector by light passing through at least a part of the light shield increases.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bulb with a reflector according to the present invention;

FIG. 1 shows a light bulb 10 with a reflector according to a first embodiment of the present invention.
A known halogen bulb 12 having a pinch seal 2a;
A reflector 14 in the shape of a bowl accommodating the base end 12a of the halogen bulb in the base opening 14a. in this case,
The base end 12a of the halogen lamp 12 is fixed in the base opening 14a of the reflector 14 with an adhesive 15 such as cement. A base 16 made of an insulating material is fixed to the outside of the base of the reflector 14, and further has electrodes 17 and 18 attached thereto.
Is fixed.

The filament 20 of the halogen bulb 12
Is extended substantially in the center of the cylindrical main body 12b of the light bulb 12 along the longitudinal direction of the main body, and supplied with power through the two lead wires 21 and 22 of the pinch-sealed base end 12a. It has become so. Then, the lead wires 21 and 22
Are electrically connected to the electrodes 17 and 18, respectively.

The reflector 14 is made of, for example, glass or the like, and is provided with a reflection film 24 on a concave inner surface such as a paraboloid. The upper opening 14b of the reflector 14 is closed by a transparent protective glass plate 25. The filament 20 is positioned substantially at, for example, a focal point of the concave surface formed by the inner surface of the reflector 14, so that the light emitted from the filament 20 and reflected by the reflection film 24 is indicated by a broken line in FIG. The light passes through the protective glass plate 25 as shown by the arrow and is emitted forward (upward in the figure) of the reflector 14. The concave inner surface of the reflector 14 is not limited to a paraboloid, but may be a concave surface formed by, for example, a spheroid, a sphere, a cone, or the like.

According to the first embodiment of the present invention shown in FIG. 1, the light bulb 12 is provided with a light-shielding body 30 for covering the distal end side of the cylindrical main body 12b. In this case, the trailing edge of the light shield 30 is
It has a positional relationship such that direct light from the rear end of the filament 20 does not reach ahead of the front peripheral edge 14c of the reflector 14. According to this embodiment, the direct light from the filament 20 is not emitted to the outside of the reflector 14 via the protective glass plate 25, thereby preventing glare. The light-shielding body 30 may be, for example, a coating made of metal or other heat-resistant light-shielding material, which is applied to the cylindrical main body 12b of the electric bulb 12, or the cylindrical main body 12b.
A cap or the like made of ceramic, metal, or other heat-resistant and light-shielding material that is fitted or fixed to the device may be used.

FIG. 2 shows a second embodiment of a light bulb with a reflector according to the present invention. In this figure, parts corresponding to those in the embodiment of FIG. The light bulb with reflector 110 of this embodiment has the same configuration as that of FIG. 1, but the reflector 114 is extended forward by a predetermined distance by a cylindrical portion 114d. In addition, the rear edge of the light shield 130 of the light bulb 112 in this embodiment is such that the direct light from the rear end of the filament 120 does not reach the front side of the front peripheral edge 114c of the reflector 114 and the filament 120
Has a positional relationship in which direct light from the front end does not reach forward of the rear edge of the cylindrical portion 114d. According to this configuration, the direct light from the filament 120 is transmitted to the protective glass plate 1.
This prevents glare since it is not released to the outside via 25. Further, since almost all the light rays emitted by the filament 120 are effectively reflected by the concave portion of the inner surface of the reflector 114, high illuminance can be obtained, but the light distribution characteristics do not deteriorate. Incidentally, on the inner peripheral surface of the cylindrical portion 114d of the reflector 114,
Usually, it is not enough to provide a reflective film.

FIG. 3 shows a third embodiment of a light bulb with a reflector according to the present invention. Light bulb with reflector 210 of this embodiment
1 is different from that of FIG. 1 in that a cylindrical hood 240 having substantially the same diameter as the opening 214b is attached to the front part of the reflector 214. The hood 240 can be formed from, for example, ceramic or metal. Further, the rear edge of the light shielding body 230 of the light bulb 212 in this embodiment does not allow the direct light from the rear end of the filament 220 to reach the front of the front peripheral edge of the hood 240, and reflects the direct light from the front end of the filament 220. It has a positional relationship that does not reach forward from the front peripheral edge 214c of the container 214. According to this configuration, the direct light from the filament 220 is
2 and the light emitted by the filament 220 is effectively reflected by the entire concave reflecting surface of the reflector 214, and the same effect as in the embodiment of FIG. 2 is obtained. The inner peripheral surface of the hood 240 is
Usually, it is preferable to make the surface non-reflective by matte black coating or the like.

The light shielding body is considered to be capable of providing the same glare prevention effect as that of the first, second and third embodiments, and of obtaining a larger amount of light than that of these embodiments. 30, 130 or 230
To the cylindrical main body of the halogen bulb (ie, glass arc tube)
Variations such as a frost treatment on the surface or a translucent or light-scattering coating applied to the surface are conceivable. According to such a modification, the amount of light of the bulb with a reflector is increased by the light beam that has passed through the frost processing section or the coating.

FIG. 4 shows a fourth embodiment of a light bulb with a reflector according to the present invention. The reflector 314 of the light bulb with reflector 310 of this embodiment is provided with a light shield 330 that covers the distal end side of the cylindrical main body 312b of the light bulb 312. This light shield 3
Reference numeral 30 denotes a cylindrical body formed of a heat-resistant and light-shielding material such as ceramic or metal and having a closed front end.
It is attached to the reflector 314 via 31, 331 (only two are shown conceptually in the figure). In this case, the rear edge of the light shielding body 330 has a positional relationship such that direct light from the rear end of the filament 320 does not reach the front side of the front peripheral edge 314 c of the reflector 314. According to this embodiment, the direct light from the filament 320 is
The light is not emitted outside of the reflector 314 via the light source 25. The columns 331 and 331 for attaching the light shield 330 to the reflector 314 are as thin as possible so as not to hinder the passing light, and the number of columns provided is as small as necessary within a range where a predetermined intensity can be obtained (for example, 3) is desirable.

FIG. 5 shows a fifth embodiment of a light bulb with a reflector according to the present invention. Light bulb with reflector 410 of this embodiment
Is constructed in substantially the same way as that of FIG.
14 is extended forward by a predetermined distance by a cylindrical portion 414d. Further, the rear edge of the light shielding body 430 of the light bulb 412 in this embodiment is such that the direct light from the rear end of the filament 420 does not reach the front side of the front peripheral edge 414 c of the reflector 414, and the direct light from the front end of the filament 420. Has a positional relationship that does not reach forward from the rear edge of the cylindrical portion 414d. According to this configuration, the same effect as the embodiment shown in FIG. 2 can be obtained.

FIG. 6 shows a sixth embodiment of a light bulb with a reflector according to the present invention. Light bulb with reflector 510 of this embodiment
Is constructed in substantially the same way as that of FIG.
14, a cylindrical hood 54 having substantially the same diameter as the opening 514b.
0 is attached. The hood 540 can be formed from, for example, ceramic or metal. Further, in the rear edge of the light shielding body 530 of the light bulb 512 in this embodiment, the direct light from the rear end of the filament 520 does not reach the front edge of the front side of the hood 540, and the direct light from the front end of the filament 520 is reflected. Front edge 5 of container 514
It has a positional relationship that does not reach ahead of 14c. According to this configuration, the same effect as the embodiment shown in FIG. 3 can be obtained.

[0025] The light-shielding member is considered to be capable of obtaining the same glare preventing effect as in the above-described fourth, fifth and sixth embodiments, and of obtaining a larger amount of light than in these embodiments. 330, 430 or 530
Is a cylinder formed of a transparent material such as glass and having a closed front end and subjected to a frost treatment on the surface, or a modification in which a translucent or light-scattering coating is applied to the surface of the cylinder. Examples are possible. According to such a modification, the amount of light of the bulb with a reflector is increased by the light beam that has passed through the frost processing section or the coating. Further, as another modified example, it is conceivable to form each of the light shielding members from a translucent or transparent heat-resistant material containing light scattering particles. Even in such a modification, it is possible to achieve both glare prevention and high light quantity.

FIG. 7 shows a seventh embodiment of the light bulb with reflector according to the present invention. Light bulb with reflector 610 of this embodiment
1 is configured substantially the same as that of FIG. 1, except that the light-shielding body 630 that is fitted to the tip of the halogen bulb 612 or fixed by cement or the like is made of, for example, a metal cap,
The difference is that a flange 631 made of a transparent material such as glass whose surface is frosted is attached to the cap. The outer diameter of the flange 631 is selected such that its outer peripheral edge is located substantially on a line connecting the rear end of the filament 620 and the peripheral edge 614c of the reflector 614. According to this embodiment, the direct light from the filament 620 does not leak outside through the protective glass plate 625, and thus glare is prevented, while the amount of light passing through the flange 631 increases. The flange 631 is not limited to a frosted glass ring, and may be formed of a glass ring coated with a translucent or light-scattering coating, or a translucent or transparent heat-resistant material containing light-scattering particles. .

FIG. 8 shows an eighth embodiment of a light bulb with a reflector according to the present invention. Light bulb with reflector 710 of this embodiment
Is provided with a glass disk 731 disposed in a plane orthogonal to the optical axis of the reflector 714 and coaxially with the optical axis. The surface of the glass disk 731 is subjected to frost treatment, and the halogen lamp 7 is bonded by an adhesive 730 such as cement.
Twelve tips. In addition, the glass disk 731
Is selected such that the periphery of the disc is approximately located on a line connecting the rear end of the filament 720 and the periphery 714c of the reflector 714. According to this embodiment, the direct light from the filament 720 does not leak outside through the protective glass plate 725, thus preventing glare, while increasing the amount of light by the light passing through the glass disk 731. . The disk 731 is not limited to a frost-treated glass disk, but may be formed of a glass disk coated with a translucent or light-scattering coating, or a transparent heat-resistant material containing translucent or light-scattering particles. You can also.

FIG. 9 shows a ninth embodiment of a light bulb with a reflector according to the present invention. In the reflector-equipped light bulb 810 of this embodiment, a halogen light bulb 812 (that is, an arc tube) is disposed in an envelope 830 made of, for example, transparent glass. 831 has a frosted outer surface. The envelope 830 may be mounted to the halogen bulb 812 itself or to the reflector 81 by known means.
Fixed to 4. In this case, the trailing edge of the frosted portion 831 of the envelope 830 is
Is selected so as to be substantially located on a line connecting the rear end of the reflector 814 and the peripheral edge 814c of the reflector 814. According to this embodiment, the direct light from the filament 820 does not leak to the outside through the protective glass plate 825 and thus glare is prevented, while the amount of light passing through the frosted portion 831 is reduced. Increase. The portion 831 of the outer tube 830 is not limited to the frost treatment, and may be coated with a coating made of a translucent or light-scattering heat-resistant material.

Each of the embodiments shown in FIGS. 7, 8 and 9 also has an embodiment in which the opening of the reflector is extended forward as shown in FIGS. 2 and 5, and FIGS. 3 and 6. An embodiment in which such a hood is provided can be applied.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a light bulb with a reflector according to the present invention.
The schematic block diagram which shows a part in cross section.

FIG. 2 shows a second embodiment of a light bulb with reflector according to the present invention;
The schematic block diagram which shows a part in cross section.

FIG. 3 shows a third embodiment of a light bulb with a reflector according to the present invention;
The schematic block diagram which shows a part in cross section.

FIG. 4 shows a fourth embodiment of a light bulb with a reflector according to the present invention;
The schematic block diagram which shows a part in cross section.

FIG. 5 shows a fifth embodiment of a light bulb with a reflector according to the present invention;
The schematic block diagram which shows a part in cross section.

FIG. 6 shows a sixth embodiment of the light bulb with reflector according to the present invention;
The schematic block diagram which shows a part in cross section.

FIG. 7 is a schematic configuration diagram of a seventh embodiment of a light bulb with a reflector according to the present invention.

FIG. 8 is a schematic configuration diagram of an eighth embodiment of a light bulb with a reflector according to the present invention.

FIG. 9 is a schematic configuration diagram of a ninth embodiment of a light bulb with a reflector according to the present invention.

[Description of Signs] 10: bulb with reflector 12: bulb 14: reflector 20: filament 24: reflective film 25: protective glass plate 30: light shield 240: hood 331: support

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01K 1/32 H01K 1/32 A

Claims (10)

[Claims] 1. A light bulb with a reflector, in which a light bulb is fixedly provided in a bowl-shaped reflector and light emitted from a light emitting portion of the light bulb is emitted to the outside of the reflector through an opening of the reflector. At least a part of the light bulb or the reflector is provided with a light shielding body that prevents direct light from the light emitting unit from reaching a region surrounded by a periphery defining the opening in the reflector. A light bulb with a reflector. 2. A light bulb with a reflector according to claim 1, wherein said bowl-shaped reflector has a concave reflecting surface on an inner surface.
The light bulb is a generally tubular halogen light bulb fixed to the bottom of the reflector at the base end such that the filament serving as the light emitting portion is substantially along the optical axis of the concave reflection surface, and the light shielding body is a light bulb of the light bulb. The light-shielding body is provided on the light bulb so as to cover the distal end thereof for a predetermined distance, and the position of the trailing edge of the light-shielding body is substantially located on a line connecting the end of the filament on the reflector bottom side and the peripheral edge of the reflector. A light bulb with a reflector, characterized in that: 3. A light bulb with a reflector according to claim 2, wherein said reflector has a bowl-shaped portion forming said concave reflecting surface and a predetermined length from said bowl-shaped portion to said peripheral edge of said reflector. A reflection portion, wherein a position of a trailing edge of the tubular portion is located on a substantially extended line of a straight line connecting the open end of the filament and a trailing edge of the light shielding body. Bulb. 4. The bulb with a reflector according to claim 1, wherein the bowl-shaped reflector has a concave reflecting surface on an inner surface.
The light bulb is a generally tubular halogen light bulb fixed to the bottom of the reflector at the base end such that the filament serving as the light emitting portion is substantially along the optical axis of the concave reflection surface, and the light shielding body is a light bulb of the light bulb. The reflector is provided on the bulb so as to cover the distal end for a predetermined distance, and the reflector has a cylindrical hood extending from the peripheral edge of the reflector for a predetermined distance in the light emission direction along the optical axis. The position of the trailing edge of the light-shielding member is substantially located on a line connecting the opening-side end of the filament and the periphery of the reflector, and the open-side edge of the hood is located at the reflector bottom of the filament. A light bulb with a reflector, which is located on a substantially extended line of a straight line connecting a side end portion and a rear edge of the light shielding body. 5. The light-shielding bulb according to claim 2, wherein the light-shielding body is made of a heat-resistant light-shielding material applied to a front surface of the bulb over a predetermined distance in a length direction of the bulb. A bulb with a reflector, comprising a coating or a cap made of a heat-resistant and light-shielding material having a predetermined length fitted to a tip of the bulb. 6. The bulb with a reflector according to claim 1, wherein the bowl-shaped reflector has an inner surface forming a concave reflecting surface,
The light bulb is a generally tubular halogen light bulb fixed to the bottom of the reflector at the base end such that the filament serving as the light emitting portion is substantially along the optical axis of the concave reflection surface, and the light shielding body is a light bulb of the light bulb. The distal end is covered over a predetermined distance and is held on the reflector via a support means, and the position of the trailing edge of the light shield connects the end of the filament on the reflector bottom side and the periphery of the reflector. A light bulb with a reflector, which is located substantially on a line. 7. A light bulb with a reflector according to claim 6, wherein said reflector has a bowl-shaped portion forming said concave reflecting surface and a predetermined length from said bowl-shaped portion to said peripheral edge of said reflector. A reflection portion, wherein a position of a trailing edge of the tubular portion is located on a substantially extended line of a straight line connecting the open end of the filament and a trailing edge of the light shielding body. Bulb. 8. The bulb with a reflector according to claim 1, wherein the bowl-shaped reflector has a concave reflecting surface on an inner surface,
The light bulb is a generally tubular halogen light bulb fixed to the bottom of the reflector at the base end such that the filament serving as the light emitting portion is substantially along the optical axis of the concave reflection surface, and the light shielding body is a light bulb of the light bulb. The distal end is covered over a predetermined distance and held on the reflector via a support means, and the reflector extends from the periphery of the reflector along the optical axis in the light emission direction over a predetermined distance. Has a cylindrical hood,
The position of the trailing edge of the light shielding body is substantially located on a line connecting the opening side end of the filament and the periphery of the reflector, and the open side edge of the hood is located on the reflector bottom side of the filament. A light bulb with a reflector, which is located on a substantially extended line of a straight line connecting an end portion and a rear edge of the light shielding body. 9. A light-shielded light bulb according to claim 6, 7 or 8, wherein the light-shielding body is made of a heat-resistant light-shielding material and covers a front end surface of the light bulb for a predetermined distance in a length direction of the light bulb. A bulb with a reflector, wherein the bulb is attached to the reflector via a predetermined number of columns substantially parallel to the length direction of the bulb. 10. The light bulb with a reflector according to claim 1, wherein at least a part of the light shielding body has a surface subjected to frost treatment, a translucent or light scattering coating. A light bulb with a reflector, characterized in that the light bulb is a transparent body coated with, a translucent body or a transparent body containing light scattering particles.