JPH0429442Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a lighting fixture with a condenser lens.

[Conventional technology]

FIG. 4 shows a conventional example. In the figure, 10 is a ceiling, and a hole 11 is provided in the ceiling 10. A device main body (not shown) is attached to the hole 11 in the ceiling 10. Then, the light source 12 is fixed to the fixture body (not shown) and installed in the ceiling area. A circular reflecting plate 14 is provided around the light source 12 to reflect the light emitted from the light source 12 downward. Further, 16 is a lens barrel fixed to the instrument body (not shown) and protruding into the room. Two lenses 18 and 20 are installed inside the lens barrel 16. Further, a mask 22 having an opening 24 having the same shape as the shape created on the irradiation surface is provided at the upper end opening of the lens barrel 16. It is assumed that the mask 22 has a circular opening 24.

The light emitted from the light source 12 is reflected by the reflection plate 14 and passes through the opening 24 of the mask 22 into the lens barrel 1.
6, and is further irradiated into the room through lenses 18 and 20. The light irradiated into the room creates a circular pattern that is a virtual image of the mask 22 on an irradiated surface such as a floor surface.

According to the lighting fixture configured in this way, the light emitted from the center of the filament 13 of the light source 12
The light L ₁ is reflected by the reflection plate 14, enters the lens barrel 16, and is irradiated onto the irradiation surface to be effectively utilized.
However, when the light source 12 with a large filament 13 is used, the deviation of the emitted light becomes large.
Even if light _L2 enters the lens barrel 16, the angle will be larger than the critical angle of the lens 18 and will be emitted from the surface of the lens 18, or like light _L3 , it will be blocked by the mask 22 and disappear into the lens. Objects that do not enter the cylinder 16 also appear. Furthermore, some light, such as light _L4 , is not reflected by the reflector 14 and leaks out of the device.
As described above, the luminous flux emitted from the light source 12 is not used effectively, resulting in problems such as a decrease in instrument efficiency and a decrease in illuminance on the irradiation surface.

In order to solve the above problems, lighting equipment as shown in FIGS. 2 and 3 has been proposed.

A proposed example of this lighting fixture will be described below with reference to FIGS. 2 and 3. In addition, the fourth
Components that are the same as those in the figures are given the same reference numerals, and their explanations will be omitted. In FIG. 2, reference numeral 26 denotes an auxiliary reflecting plate fitted into the opening of the mask 22.
The reflector 14 is referred to as a main reflector in this proposed example.

The auxiliary reflector 26 is a cylinder that penetrates vertically.
The upper part 28 projects upward from the lens barrel 16, and the inside of the upper part 28 is curved to form part of a sphere centered on the light source 12.

Further, the cylindrical lower part 30 of the auxiliary reflection plate 26 is vertically fitted into the lens barrel 16.

Note that the outer diameter of the auxiliary reflector 26 is smaller than that of the main reflector 14, and the light reflected on the inner surface of the auxiliary reflector 26 is incident on the lens barrel 16.

According to the lighting fixture configured in this way, the third
As shown in the figure, light L ₅ emitted from the center of the filament 13 of the light source 12 is reflected by the main reflection plate 14 and enters the lens barrel 16 .

Furthermore, the light that has entered the lens barrel 16 passes through the lenses 18 and 20 and is irradiated onto an irradiated surface such as a floor in the room, creating a circular pattern on the irradiated surface.

In addition, the filament 13 is large and the light source 12
Even if a deviation occurs in the optical path of the light emitted from the lens, the light is reflected by the auxiliary reflecting plate 26 and enters the lens barrel 16. That is, even if it enters the lens barrel 16, the angle will be larger than the critical angle of the lens 18, and even the light _L6 reflected from the surface of the lens 18 will be reflected by the lower part 30 of the auxiliary reflector 26, and the angle will be larger than the critical angle. Even a small amount of light can be incident.

In addition, even if the light _L7 is blocked by the mask 22 or the light _L8 leaks out of the device without being reflected by the main reflector 14,
It is reflected by the upper part 28 of the auxiliary reflector 26 and the lens barrel 1
It can be entered within 6.

In this way, the luminous flux emitted from the light source 12 is effectively utilized, the efficiency of the device can be increased, and the illuminance of the irradiation surface is improved.

Further, the upper part 28 of the auxiliary reflector 26 is connected to the mask 22.
The lens barrel 16 protrudes further upward and dust
This can prevent dust from entering the lens 18 and prevent dust from accumulating on the surface of the lens 18.

[The problem that the idea attempts to solve]

The lighting equipment shown in Figures 2 and 3 above is
Since the lower part 30 of the auxiliary reflector 26 was cylindrical, the light reflected by the lower part 30 does not become parallel light, but instead enters the lenses 18 and 20 in the lens barrel 16, and is emitted from the lens barrel 16. As for the irradiation pattern of the irradiation light onto the floor surface, only one with large aberrations and non-uniformity (border is not clear and illuminance within the pattern is non-uniform) can be obtained.

In addition, since the light that enters the lens is not parallel, the intensity of the incident light in each part of the lens becomes uneven, and the temperature rise of the lens becomes uneven, causing local distortion in the lens and increasing lens aberration. Become,
As the irradiation pattern of the irradiation light onto the floor surface, etc., only a non-uniform pattern with large aberrations can be obtained.

The purpose of this invention is to provide a lighting fixture that can provide a uniform irradiation pattern of light onto a floor surface or the like with less aberration.

[Means to solve the problem]

The lighting equipment of this invention has a main reflector around the light source that reflects the light emitted from the light source downward, a lens barrel with a lens arranged inside is provided below the light source, and an auxiliary lens is attached to the top end of the lens barrel. A reflective plate is provided.

The auxiliary reflection plate has an upper part protruding above the lens barrel, and a lower part having a parabolic shape inserted into the lens barrel so that the light source is located at the focal point.

The upper part reflects the direct light from the light source and the reflected light from the main reflector toward the main reflector or the lens, and the lower part reflects the direct light from the light source or the reflected light from the main reflector and makes it incident. The beam is made to enter the lens as substantially parallel light with an angle smaller than the critical angle.

[Effect]

According to the configuration of this invention, the parabolic lower part of the auxiliary reflector is inserted into the lens barrel, and the parabolic lower part of the auxiliary reflector serves as an auxiliary reflector so that the light source is located at the focal point. The lower part of the auxiliary reflector reflects the direct light from the light source or the reflected light from the main reflector and makes it enter the lens with an angle of incidence smaller than the critical angle. This makes it possible to efficiently collect and irradiate direct light from the light source and reflected light from the main reflector with the lens. As a result, the efficiency of the device can be increased and the illuminance of the irradiation surface can be sufficiently increased.

In addition, since the lower part of the auxiliary reflector has a parabolic shape, the light reflected by the lower part becomes approximately parallel light and enters the lens in the lens barrel, and the light emitted from the lens barrel is emitted from the floor surface, etc. A uniform irradiation pattern with no aberrations (clear boundaries and uniform illuminance within the pattern) can be obtained.

Also, when parallel light enters the lens,
Light enters each part of the lens with almost uniform intensity,
As the temperature of the lens increases uniformly, local distortion will not occur in the lens and lens aberrations will not increase.In this respect, the irradiation pattern of the irradiated light on the floor surface, etc., will not be affected by the aberrations mentioned above. A uniform product is obtained.

〔Example〕

An embodiment of this invention will be described based on FIG. Note that the same parts as in FIG. 2 are designated by the same reference numerals, and the explanation thereof will be omitted. In FIG. 1, 32 is an auxiliary reflecting plate fitted into the opening of the mask 22 (in place of the auxiliary reflecting plate 26 in FIG. 2).

The auxiliary reflector 32 is a cylinder that penetrates vertically,
The upper part 34 projects upward from the lens barrel 16, and the inside of the upper part 34 is curved to form part of a sphere centered on the light source 12.

Further, the parabolic shape of the auxiliary reflecting plate 32, that is, the lower part 36 having a parabolic cross section is fitted into the lens barrel 16 with its central axis perpendicular. At this time, the auxiliary reflection plate 32 is arranged so that the parabolic lower part 36 is located at the focal point of the light source 12.

Note that the outer diameter of the auxiliary reflector 32 is smaller than that of the main reflector 14, and the light reflected on the inner surface of the auxiliary reflector 32 is incident on the lens barrel 16.

According to the lighting fixture configured in this way, the light reflected by the lower part 36 of the auxiliary reflector 32 becomes approximately parallel light and enters the lenses 18 and 20 in the lens barrel 16, and is emitted from the lens barrel 16. A uniform irradiation pattern with no aberrations (clear boundaries and uniform illuminance within the pattern) can be obtained as an irradiation pattern of the irradiation light onto the floor surface or the like.

In addition, since the parallel light is incident on the lenses 18 and 20, the light is incident on each part of the lenses 18 and 20 with almost uniform intensity, and the temperature of the lenses 18 and 20 is uniformly increased. Lens aberrations do not increase due to local distortions 18 and 20, and in this respect as well, a uniform irradiation pattern with no aberrations can be obtained for the irradiation light onto the floor surface etc. as described above.

Since the points other than the above are the same as the lighting fixture shown in FIG. 2, the explanation will be omitted.

Furthermore, although this embodiment shows a lighting fixture that is embedded in the ceiling, it may be of a type other than the embedded type.

[Effect of idea]

According to the lighting device of this invention, the lower part of the auxiliary reflector is inserted into the inside of the lens barrel, and the lower part of the auxiliary reflector reflects the direct light from the light source or the reflected light from the main reflector. Since the angle is smaller than the critical angle, it is made to enter the lens, so reflection on the lens surface can be suppressed.
The direct light from the light source and the reflected light from the main reflector can be efficiently collected and irradiated by the lens, increasing the efficiency of the device and sufficiently increasing the illuminance of the irradiation surface.

In addition, since the lower part of the auxiliary reflector has a parabolic shape, the light reflected by the lower part becomes approximately parallel light and enters the lens in the lens barrel, and the light emitted from the lens barrel is emitted from the floor surface, etc. A uniform irradiation pattern with no aberrations (clear boundaries and uniform illuminance within the pattern) can be obtained.

Also, when parallel light enters the lens,
Light enters each part of the lens with almost uniform intensity,
The temperature of the lens will rise uniformly, and local distortion will not occur in the lens and lens aberration will not increase.In this respect, the irradiation pattern of the irradiated light on the floor surface, etc., will reduce the aberration as described above. A uniform product is obtained.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of an embodiment of this invention, Figure 2 is a partial sectional view of a proposed example of a lighting fixture, Figure 3 is a sectional view showing its operating state, and Figure 4 is a conventional example of a lighting fixture. FIG. 12... Light source, 14... Main reflecting plate, 16... Lens tube, 18, 20... Lens, 32... Auxiliary reflecting plate, 34... Upper part, 36... Lower part.

Claims (1)

[Claims for Utility Model Registration] A light source, a main reflecting plate provided around the light source and reflecting the light emitted from the light source downward, and a lens barrel provided below the light source and having a lens disposed therein. and a lower part having a parabolic shape with an upper part protruding above the lens barrel is provided at the upper end of the lens barrel with the lower part inserted into the lens barrel so that the light source is located at the focal point, and the upper part The direct light from the light source and the reflected light from the main reflecting plate are reflected toward the main reflecting plate or the lens, and the lower part reflects the direct light from the light source or the reflected light from the main reflecting plate. A lighting fixture comprising: an auxiliary reflector that reflects the light and makes it enter the lens as substantially parallel light with an incident angle smaller than a critical angle.