JPH11111017A - Down-light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a down-light with a high-grade feeling while obtaining a glareless angle range, without unnecessary light core and ring appearing on a radiation plane. SOLUTION: A cylindrical member 11 to interrupt part of light radiated from a lamp 6 to a cone reflector 3 is provided around the lamp 6. The cylindrical member 11 is provided above a tangent line ab drawn from the end (a) on the lower opening of the cone reflector 3 to the lamp 6, to be properly positioned and levelled for interrupting beam, which generates unnecessary light core and ring on a radiation plane, from being injected into the cone reflector 3. In this way, no unnecessary light core and ring appear on the radiation plane. The inner face of the cone reflector 3 is a flat and specular plane, so that a glareless angle range can be obtained with a high-grade feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a downlight which is installed on a ceiling and illuminates a lower side, and more particularly to a downlight using a high-intensity lamp.

[0002]

2. Description of the Related Art Downlights installed on a ceiling and illuminating the lower side are widely used in office automation (OA) rooms and corridors. An example is shown in FIG. 3, 1 is a ceiling surface, 2 is a main body, 3 is a cone reflector, 4 is a spring body, 5 is a reflector, 6 is a lamp, 7 is a socket, and 8 is a socket holder.

The main body 2 is embedded in the ceiling surface 1. A socket holder 8 is attached to the main body 2 with screws,
The socket 7 is attached to the socket holder 8. The lamp 6 is attached to the socket 7. On the other hand, a spring 4 is attached to the main body 1, and the cone reflector 3 is supported by the spring 4. A reflector 5 is provided above the cone reflector 3 so as to be supported by the cone reflector 3. Each of the reflector 5 and the cone reflector 3 has a circular horizontal cross section, and is formed of a curved surface such that the diameter increases as going downward.

In such a downlight, the light emitted from the lamp and reflected by the reflectors (in FIG. 3, the cone reflector 3 and the reflector 5) is viewed when the vertical angle of the light is large. People feel dazzling. This is called glare. Generally, the reflection plate is formed so as to reduce the glare, and a horizontal angle at which no glare occurs is called a light blocking angle.

The light-shielding angle is determined by the lower end of the reflection plate on the light emitting aperture side (in FIG. 3, the lower end a of the lower opening surface of the cone reflector).
It is designed so that an angle (θ in FIG. 3) formed between a straight line in contact with the surface of the lamp 6 drawn from the horizontal line and a horizontal line. That is, in FIG. 3, when the downlight is viewed from an angle of θ or less, the user does not feel dazzling, and this range is called a glareless angle range. In FIG. 3, b is a contact point of the lamp 6 with a straight line coming into contact with the surface of the lamp 6 drawn from the lower end of the light-projecting opening side reflector, and c is an intersection of the straight line and the reflector. In FIG. 3, the portion below c is the cone reflector 3 and the upper portion is the reflector 5.

When the inner surface of the cone reflector 3 is mirror-shaped, as shown by a two-dot chain line in FIG.
Is reflected specularly on the inner surface of the cone reflector 3, and depending on the shape of the cone reflector 3, the light reflected from each part is collected and appears on the irradiation surface as a light core or ring. These unnecessary cores and rings are caused by the fact that the reflector is not perfectly curved.

In order to prevent this, particularly when a high-intensity lamp (metal halide lamp, halogen lamp, etc.) is used, instead of a cone reflector, a cone baffle made of an aluminum material having a low specularity is provided below the reflector. It is common to provide a cone baffle that is painted in white, black, and black.

[0008]

However, when a cone baffle having a low specularity is used to prevent the above-mentioned light core and ring from being generated, the light reflected from the cone baffle is diffused light. However, no matter how the shape of the cone baffle is selected, a glare-less angle range cannot be obtained, and there is a problem that it is unsuitable as illumination for OA or the like. Another problem is that the cone baffle has a low specularity, so there is no sense of quality.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an unnecessary light core or ring does not appear on an irradiation surface while obtaining a glare-less angle range, and it has a high-class feeling. It is an object to provide a downlight.

[0010]

A first means for solving the above-mentioned problem is to provide a cone reflector having a flat mirror-like inner surface on a light-projecting opening side, and to pass through a lower end of the cone reflector and contact a lamp. A downlight (Claim 1) characterized in that a cylindrical member having an inner diameter larger than the lamp diameter is provided at an upper portion so as to surround the lamp.

According to this means, the cylindrical member provided around the lamp blocks the projection of the light onto the reflecting surface of the cone reflector which generates the above-mentioned unnecessary light core and ring. The ring can be prevented from appearing on the irradiation surface. Further, since a mirror-like cone reflector having a flat reflecting surface is used, a glare-less angle range can be obtained, and a high-quality one can be obtained. In addition, since the cylindrical member is installed above the straight line and the reflected light from the inner surface of the cylindrical member is not directly visible from an angle within the light blocking angle, the light blocking angle does not become narrow as set.

The reflecting surface for generating the light core and the ring differs depending on the shape of the lamp and the shape of the cone reflector. Therefore, the mounting position and height of the cylindrical member are determined according to the type of each downlight. Since the cylindrical member blocks light, it is preferable that the height thereof be minimized.

[0013] A second means for solving the above-mentioned problems is as follows.
A doughnut-shaped translucent plate having an inner diameter larger than the outer shape of the lamp is provided above a straight line passing through the lower end of the cone reflector and in contact with the lamp. A downlight (claim 2) characterized in that it is provided horizontally around a circle.

According to this means, the light reflected by the cone reflector and traveling downward is diffused by the translucent plate to become diffused light and incident on the cone reflector, so that the light reflected by the cone reflector is partially reflected. Concentration does not occur, and it is possible to prevent the light core or ring from appearing on the irradiation surface. In addition, since the reflective surface uses a flat mirror-like cone reflector, a glareless angle range is obtained,
In addition, a high-quality product can be obtained. Since the translucent plate is installed above the straight line, and the diffused light on the surface of the translucent plate is not directly visible from an angle within the light blocking angle, the light blocking angle does not become narrow as set.

The reflecting surface that generates the light core and ring differs depending on the shape of the lamp and the shape of the cone reflector. Therefore, according to the type of each downlight, the mounting position of the translucent plate and the width (outer diameter and inner diameter) And the difference). Since the translucent plate reduces the amount of transmitted light, it is preferable that the width of the plate is minimized.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a first example of an embodiment of the present invention. In FIG. 1, 1 is a ceiling surface, 2
Is a body part, 3 is a cone reflector, 4 is a spring body, 5 is a reflector, 6 is a lamp, 7 is a socket, 8 is a socket holder, 11 is a cylindrical member, and 12 is a support.

The main body 2 is embedded in the ceiling surface 1. A socket holder 8 is attached to the main body 2 with screws,
The socket 7 is attached to the socket holder 8. The lamp 6 is attached to the socket 7. On the other hand, a spring 4 is attached to the main body 1, and the cone reflector 3 is supported by the spring 4. A reflector 5 is provided above the cone reflector 3 so as to be supported by the cone reflector 3. Each of the reflector 5 and the cone reflector 3 has a circular horizontal section, and is formed of a curved surface having a larger diameter as it goes downward. A portion below a tangent line ab (b is a contact point on the surface of the lamp 6) drawn from the end a of the lower opening surface of the cone reflector 3 toward the lamp 6,
The upper part is a reflector 5. c is the intersection of the straight line ab and the cone reflector 3.

Around the lamp 6, a cylindrical member 11 that blocks a part of light emitted from the lamp 6 to the cone reflector 3.
Are provided above the straight line bc. Cylindrical member 11
Are supported by supports 12 provided at two to four upper portions of the cone reflector 3. The cylindrical member 11 is provided at an appropriate position and at an appropriate height so as to block light rays that generate unnecessary light cores and rings on the irradiation surface from entering the cone reflector 3. Since these differ depending on the shape of the lamp 6 and the shape of the cone reflector 3,
Determined for each type of downlight.

As a result, unnecessary light cores and rings do not appear on the irradiation surface. Further, since the cylindrical member 11 is installed above the straight line bc and the reflected light on the inner surface of the cylindrical member 11 cannot be directly seen from an angle within the light shielding angle θ, the light shielding angle θ does not become narrow as set. Since the cylindrical member 11 blocks light, it is preferable that the height thereof is minimized.

In this downlight, since the inner surface of the cone reflector 3 is a flat mirror surface, a glare-less viewing angle can be obtained, and there is a sense of quality.

FIG. 2 shows a second example of the embodiment of the present invention. Since the format of the downlight in FIG. 2 is the same as that shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof will be omitted. In FIG. 2, reference numeral 13 denotes a doughnut-shaped translucent plate, which is attached above the straight line bc. The translucent plate 13 has an appropriate plate width (difference between an outer diameter and an inner diameter) at an appropriate position to diffuse a ray of light that generates an unnecessary light core or ring on the irradiation surface, which is incident on the cone reflector 3. Is provided. Since these differ depending on the shape of the lamp 6 and the shape of the cone reflector 3, they are determined for each type of downlight.

Light from above the cone reflector 3 is diffused by the translucent plate 13 and becomes diffused light to enter the cone reflector 3. Therefore, the light reflected by the cone reflector does not concentrate on a part, and it is possible to prevent the light core or ring from appearing on the irradiation surface. Further, the translucent plate 13 is provided above the straight line bc, and has a light shielding angle θ.
Since the diffused light on the surface of the translucent plate cannot be directly seen from the angles within the range, the light shielding angle θ is not narrowed as set. Since the translucent plate 13 reduces the amount of transmitted light, the width of the translucent plate 13 is preferably minimized.

Also in this downlight, since the inner surface of the cone reflector 3 is a flat mirror surface, a glare-less viewing angle can be obtained and there is a sense of quality.

[0024]

As described above, in the invention according to claim 1 of the present invention, a cone reflector having a flat mirror-like inner surface is provided on the light emitting opening side, and passes through the lower end of the cone reflector to the lamp. Since a cylindrical member having an inner diameter larger than the lamp diameter is provided around the lamp above the contacting straight line, it is possible to prevent the light core or ring from appearing on the irradiation surface. Further, since a mirror-like cone reflector having a flat reflecting surface is used, a glare-less angle range can be obtained, and a high-quality one can be obtained.

In the invention according to the second aspect, a cone reflector having a flat mirror-like inner surface is provided on the side of the light emitting opening, and is larger than a straight line passing through the lower end of the cone reflector and in contact with the lamp and larger than the outer shape of the lamp. Since the donut-shaped translucent plate having an inner diameter is provided horizontally around the lamp, it is possible to prevent the light core and the ring from appearing on the irradiation surface. Further, since a mirror-like cone reflector having a flat reflecting surface is used, a glare-less angle range can be obtained, and a high-quality one can be obtained.

[Brief description of the drawings]

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

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

FIG. 3 is a diagram showing an example of a conventional downlight.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceiling surface 2 Main body part 3 Cone reflector 4 Spring body 5 Reflector 6 Lamp 7 Socket 8 Socket holder 11 Cylindrical member 12 Supporter 13 Translucent plate θ Light shielding angle

Claims (2)

[Claims] 1. A cylindrical member having an inner diameter larger than an outer diameter of a lamp is provided above a straight line passing through a lower end of the cone reflector and in contact with the lamp. A downlight provided around a lamp. 2. A doughnut-shaped half having an inner diameter larger than the outer shape of the lamp, wherein a cone reflector having a flat mirror-like inner surface is provided on the light emitting opening side and above a straight line passing through the lower end of the cone reflector and in contact with the lamp. A downlight having a transparent plate provided horizontally around a lamp.