JPH10321196A - Light bulb with reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the glare, reduce a loss in illuminance, and prevent the degradation of a light distribution characteristic by arranging a light shielding body to prevent the direct light from a light emitting part from reaching this transparent protective plate, in a part of the front transparent protective plate SOLUTION: This bulb having a reflector 10 has a tungsten halogen lamp 12 whose base end part 12a is sealed by a pinch and a bowl-shaped reflector 14 to house the base end part 12a of this tungsten halogen lamp 12 in a base part opening 14a. A bottomed cylindrical light shielding body 30 to cover the tip side of a cylindrical main body part 12b of the tungusten halogen lamp 12, is arranged so that a bottom part is fixed to an almost central part of an inside surface of a protective glass plate 25. The rear edge (the lower side peripheral edge) of this light shielding body 30 has the positional relationship such as the direct light from the rear end of a filament 20 does not reach forward more than the front side peripheral edge 14c of the reflector 14. Since the direct light from the filament 20 is not radiated outside the reflector 14 through the protective glass plate 25, the glare is prevented, and a loss in illuminance is reduced.

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 light bulb such as a halogen light bulb is mounted in a reflector having a front glass, and more specifically to prevent glare caused by direct light from a light source. To a light bulb with a reflector.

[0002]

2. Description of the Related Art A light bulb with a reflector, in which a high-intensity bulb such as a halogen bulb is incorporated in a reflector provided with a front glass, has a high illuminance and excellent light distribution characteristics. It is widely used as a light source for display lighting of shop windows 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 in order to solve the above-mentioned problems, and an object of the present invention is to provide a light bulb with a reflector which is integrated with a reflector having a front glass. Another object of the present invention is to provide a reflector-equipped light bulb having a glare prevention structure capable of effectively preventing glare, reducing loss of illuminance, and preventing deterioration of light distribution characteristics.

In order to achieve the above object, a light bulb with a reflector according to the present invention is provided with a bulb fixedly provided in a bowl-shaped reflector, and the light emitted from the light emitting portion of the bulb closes an opening of the reflector. In a light bulb with a reflector that emits to the outside of the reflector via a transparent protective plate, a light-shielding part of the front transparent protective plate for preventing direct light from the light emitting unit from reaching the transparent protective plate. It is characterized by having a body.

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-described 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 parabolic reflection surface. A substantially tubular halogen lamp fixed to the reflector bottom, the light shield is provided on the transparent protective plate 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 It is preferable that the filament be located substantially on a line connecting the end of the filament on the reflector bottom side and the periphery of the reflector.

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 substantially on an extension of a straight line connecting the open end of the filament and the rear edge of the light shield. Good to do.

According to this configuration, the light emitted from the filament can be supplied to the concave reflecting surface to the maximum extent, and the direct light from the filament can be prevented from being emitted outside the reflector. Accordingly, it is possible to maintain high light intensity 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 filament is placed at the base end of the bulb so that the filament is substantially along the optical axis of the concave reflecting surface. A substantially tubular halogen bulb fixed to the bottom of the reflector, the light-shielding body is provided on the transparent protective plate so as to cover the distal end side of the bulb over a predetermined distance, and the reflector is the reflector of the reflector. A cylindrical hood extending from the periphery along the optical axis for a predetermined distance in the light emission direction is provided, and the rear edge of the light-shielding body has the opening-side end of the filament and the periphery of the reflector. So that the open end of the hood is positioned substantially on an extension of a straight line connecting the end of the filament on the reflector bottom side and the rear edge of the light shield. You may.

In each of the above examples, the light-shielding body is made of a heat-resistant material coated with a heat-resistant light-shielding material or a heat-resistant light-shielding material, the bottom of which is fixed to a substantially central portion of the inner surface of the front transparent protective plate. Of a bottomed cylindrical body.

[0012]

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 has a reflection film 24 on the inner surface thereof, which is a concave 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, a cylindrical light-shielding body 30 with a bottom covering the distal end side of a cylindrical main body portion 12b of a light bulb 12 has a bottom portion inside a protective glass plate 25. It is provided by being fixed to a substantially central portion of the surface. In this case, the trailing edge of the light shield 30 (the lower peripheral edge in the figure)
Means that the direct light from the rear end of the filament 20
Has a positional relationship such that it does not reach the front side of the front side peripheral edge 14c (that is, does not reach the protective glass plate 25). 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 can be made of, for example, a heat-resistant material coated with a metal or the like, ceramic, or metal. The shape of the light shielding body 30 is not limited to a bottomed cylinder, and is not limited to a bottomed cylinder. Other shapes can be used as long as they cover the distal end side and can be attached to the protective glass plate 25.

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 of 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 the light bulb with 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.

[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.

[Explanation of symbols]

 10: Light bulb with reflector 12: Light bulb 14: Reflector 20: Filament 24: Reflective film 25: Protective glass plate 30: Light shield 240: Hood 331: Support

Claims (5)

[Claims] An electric bulb is fixedly provided in a bowl-shaped reflector, and light emitted from a light emitting portion of the electric bulb is emitted to the outside of the reflector via a front transparent protective plate closing an opening of the reflector. A light bulb with a reflector, wherein a light shield for preventing direct light from the light emitting portion from reaching the transparent protective plate is provided on a part of the front transparent protective plate. 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 front transparent protective plate so as to cover the front end side over a predetermined distance, and the position of the rear edge of the light shield connects the end of the filament on the reflector bottom side and the opening side peripheral edge of the reflector. A light bulb with a reflector, which is located substantially on a line. 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 reflector bottom at the base end so that the filament serving as the light emitting part 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 front transparent protective plate so as to cover the front end side for a predetermined distance, and the reflector extends from the peripheral edge of the opening side of the reflector for a predetermined distance in the light emission direction along the optical axis along the optical axis. A rear end of the light-shielding body is located substantially on a line connecting an end of the filament on the opening side and a peripheral edge of the reflector, and an end of the open side of the hood is the filament; A light bulb with a reflector, which is located on a substantially extended line of a straight line connecting an end of the reflector on the bottom side and a rear edge of the light shielding body. 5. The light bulb with a reflector according to claim 2, wherein the light shielding body is made of a heat-resistant light-shielding material having a bottom fixed to a substantially central portion of an inner surface of the front transparent protective plate. A light bulb with a reflector, which is a bottomed cylindrical body made of a coated heat-resistant material or a heat-resistant light-shielding material.