JPH09139109A - Reflection efficiency optimized reflector and floodlight using the reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a wide angle of light distribution, to optimize light reflection efficiency, and to prevent light energy losses, by improving a light reflection characteristic while increasing center illuminance through making depth of a reflector to be 70 to 80% of its radius. SOLUTION: A reflector 1 is designed so as to have a reflector depth d which is a depth of 70 to 80% of a radius r of the reflector. Light emitted from a light source 2, whether it is direct light or indirect light, being transmitted by all parts of a lens 3 including an upper end part p and a lower end part q, is emitted forward and contributes to creation of floodlight. Quantity of transmitted light is optimized by this depth of the reflector, and illuminance of light is increased and, at the same time, light is emitted in a wide angle, without changing the light source 2 and the lens 3, and thus optimization of reflection efficiency of light is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector, and more particularly, to a wide angle light distribution characteristic of flood light,
The present invention relates to a reflector for optimizing reflection efficiency that can uniformly and evenly increase the illuminance distribution between the central illuminance of flood light and the ambient illuminance, and a floodlight and a spot floodlight using the reflector.

[0002]

BACKGROUND OF THE INVENTION Spotlights and floodlights have traditionally been used to illuminate specific props or props or persons in stage or TV studio lighting. Further, as a floodlight, an illuminating device that can uniformly illuminate a fairly wide range of illuminance is used.

Conventionally, one illuminating device is independently used to switch between a spotlight and a floodlight, but this switching makes the distance between the light source and the lens longer or shorter. It is achieved by When this distance is long, it becomes spot light, and when this distance is short, it becomes flood light. The floodlight is used as a base light in stage lighting or TV studio lighting, and is particularly required to illuminate the entire range to be illuminated with a uniform and uniform illuminance of the same level.

Conventionally, in order to realize such a flood light having a uniform and uniform illuminance, the arrangement structure of the filaments of the light source is changed, the thickness and aperture shape of the lens system,
Efforts have been made to achieve it by changing the material, and further by subjecting the lens surface to frosting, but the ideal flood light has not yet been achieved. The present invention is intended to be achieved by improving the shape and structure of the reflector in order to realize a uniform and uniform flood light having a higher central illuminance and a wider angle than the conventional one.

[0005]

A particular wide area to be lit in a stage or TV studio, namely:
Illumination exhibiting the same illuminance distribution from the center of the optical axis to the peripheral portion is ideal as flood light (see FIG. 3B). However, the illuminance of the light emitted from the light source is
Even if the light passes through the lens system, the central part of the entire circle centered on the optical axis is extremely high, and the illuminance decreases as it spreads to the periphery.

FIG. 3 (a) shows the light distribution characteristics of the luminaire currently in use. In FIG. 3A, the center of the optical axis is the y-axis, the y-axis means the illuminance of light (lx), the x-axis means the spread of light (m), and the x-axis is ± 3 m, for example. Is in the range. If it is separated from the center of the optical axis as a symmetric quadratic curve around the y axis, the illuminance decreases in inverse proportion to the length of the distance. In a far wide peripheral portion, the illuminance drastically drops because the illuminance is inversely proportional to the square of the distance. When the light having the illuminance characteristic of the light shown as such a quadratic curve is used on the stage or in the TV studio, the entire area to be illuminated is not uniformly illuminated, and the light and shade of light are present in the central portion and the peripheral portion of the optical axis. It is difficult to use as a base light, and it becomes unpopular particularly in human lighting such as casters and talents.

FIG. 3B shows an ideal light distribution characteristic of the floodlight. This graph is illuminated with the same illuminance (lx) over the periphery around the optical axis of the y axis, and light hangs at a distance of, for example, ± 3 m from the optical axis. A floodlight that exhibits such an illuminance distribution is set on a stage or TV
By illuminating the entire area to be illuminated in the studio, a very uniform and uniform light having no light and shade is emitted, which is extremely useful as a base light. The present invention is to create a reflector exhibiting the illuminance distribution of FIG. 3 (b), and further to propose a floodlight and a spot floodlight using such a reflector.

FIG. 2 shows a reflector that has been used conventionally. Generally, the structure of the reflector is such that, when the radius of the reflector is r, the depth of the reflector (the optical axis and the connection between the edge of the reflector and the edge thereof is The depth of the reflector was designed to have a radius of about 50%, where d is the distance from the point where and are orthogonal to the bottom of the reflector. This was mainly taken into consideration from the demand for miniaturization of each component constituting the lighting device. However, as a reaction inherent in the advantages achieved by miniaturizing the components in this way, the drawbacks of low central illuminance and narrow wide angle have been claimed.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the drawbacks of the above description. In a spot floodlight using a conventional reflector, a floodlight in which a lens is brought close to a light source is used. When illuminated, the angle of light reflected from the reflector and transmitted through the lens is narrow,
Therefore, it was found that the central illuminance of the flood light was reduced due to the small amount of light passing through the lens, and the flood light was not emitted at a wide angle. In the conventional general design of the reflector, it is common knowledge that the depth of the reflector is about 50% of the radius of the reflector. It has been found that the present invention solves the problem by making the depth of the reflector about 70% to 80% of the radius of the reflector, contrary to the common sense of the design.

That is, the reflector for optimizing the reflection efficiency of the present invention has a radius of the reflector as r, a depth of the reflector as d, and an equation; d = k · r, where 7/10 ≦ k ≦
It is characterized by satisfying that it is set to 8/10. Further, the floodlight of the present invention includes at least the reflector, a light source, and a lens system in a housing, and the reflector is slidably arranged so that the central illuminance of floodlight is high and a wide-angle uniform light is emitted. Is irradiated. Furthermore, the spot floodlight of the present invention includes at least the reflector, the light source, and the lens system in a housing, and the reflector and the light source are slidably arranged relative to the lens system, The central illuminance of light is high, and it is characterized by radiating a wide angle of uniform light.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to explain the embodiment of the present invention shown in FIG. 1, the problems of the conventional reflector shown in FIG. 2 will be described in detail. In FIG. 2, the light emitted from the light source 2 ', the light directly going to the lens 3'and the light reflected to the conventional reflector 1' both pass through the lens 3 ', but the light α'
Is transmitted through the point q ′ of the lens and absorbed by the lens frame 4 with the lens frame 4 as a boundary, or is reflected by the lens frame 4 and radiated forward. On the other hand, the light β ′ passes through the point p ′ of the lens and is absorbed by the lens frame 4 with the lens frame 4 as a boundary or reflected by the lens frame 4 and emitted forward. In this case, it includes, between the upper end portion p and the point p ′ of the lens and between the lower end portion q of the lens and the point q ′ of the lens, so to speak, an orthogonal point o ′ between the optical axis lines o and o and the lens 3 ′. If the radius between the lens and the point p'or q'of the lens is s ', the portion of the cylindrical body (hatched area) excluding the area portion πs' ² of the circle with radius s'is the light Does not pass through, or does not radiate forward even if it passes through, does not create flood light at all, and is simply wasted as useless light that does not contribute to the creation of flood light. The light that contributes to the creation of flood light is only the light that has passed through the area πs ′ ² of the circle whose radius is the point o ′ and the point p ′ of the lens.

On the other hand, the reflector 1 used as an embodiment of the present invention in FIG. 1 is designed such that the depth of the reflector is 70% to 80% of the radius r of the reflector. Therefore, the light emitted from the light source 2 is, for example, the direct light directed to the lens and the indirect light reflected toward the reflector. For example, the light α is the lower end q of the lens 3. To Penetrate. Further, the light β is transmitted through the upper end portion p of the lens. That is, the light emitted from the light source 2, whether it is direct light or indirect light, is transmitted through all the parts 3 of the lens 3 including the upper end portion p and the lower end portion q of the lens 3 and is emitted to the front side to flood. It will contribute to the creation of light. That is, the light that contributes to the creation of flood light is the entire area of the lens 3 if the radius of the entire lens 3, that is, the optical axis o, o and the orthogonal point o ′ of the lens 3 and the point p is s. Becomes πs ² .

In FIG. 2, the range of the lens that contributes to the creation of the floodlight is πs ' ² which is the area 3'of the circle with the circumferential ends at the points p'and q', and similarly in FIG. The area of the lens that contributes to creating the floodlight is the entire lens 3 including the lens outer edges p and q.

In such a case, the conventional reflector having a depth of 50% allows light to pass through a small circle excluding the outer peripheral surface (cylindrical body of the shaded portion) of the lens, while the depth shown in FIG. In the reflector having a depth of 70% to a depth of 80%, light is transmitted through the entire lens 3. That is, when a reflector having a depth of 70% to a depth of 80% is used, the area of the lens through which light passes is πs ² .
When a reflector having a depth of 50% is used, the area of the lens through which light is transmitted is πs' ² .

Further, since the lens area πs ² of the present invention> the conventional lens area πs' ² , the amount of light transmitted by the reflector of the present invention is further optimized. Depth of 50% to 7
The illuminance of the light is increased and the light is emitted at a wide angle without changing the other light sources 2 and the lens 3 only by making the depth to 0%.

The basis of the wide angle change at the time of spotting or flatting due to the difference in reflector depth will be described. When flooding, the angle between the lens outer surface and the central axis of the lamp is the angle of use of the reflector, and when flat, a wide angle is used. On the other hand, at the spot, since the distance between the reflector and the lens becomes large, the use angle of the reflector becomes narrow.

FIG. 4 is experimental data showing changes in central illuminance using the 70% depth reflector of the present invention and the conventional 50% depth reflector. The x-axis shows the depth of the reflector and the y-axis shows the illuminance (lx). 50% reflector depth and 70 reflector depth on the x-axis
Two perpendicular lines are drawn at%. In the upper spot light, the illuminance is between 9000 lx and 10,000 lx, and there is no difference in the central illuminance between the 50% depth reflector and the 70% depth reflector.

On the other hand, the flood light has an illuminance of 1,7 from the reflector depth of 100% to 70% on the x-axis.
It is gradually decreasing from 00lx and reaches 1,675lx at a depth of 70%, and the central illuminance difference between a 70% depth reflector and a 100% depth reflector is 25lx.
It is nothing more than

A feature of particular importance to the present invention is the depth 70.
%, The central illuminance of the reflector was 1,675 lx, but the central illuminance of the reflector with a depth of 50% was 1,520.
lx and the central illuminance of a 70% reflector 1,6
Central illuminance of reflector from 75 lx to 50% depth 1,5
It shows an extremely quadratic curve at 20 lx and shows a drooping hysteresis phenomenon.

The meaning of this hysteresis curve is that when a reflector having a depth of 50% was used, flood light with a central illuminance of 1,520 lx was emitted in the past. When a 70% reflector is used, it is possible to emit flood light with a central illuminance of 1,675 lx by changing only the depth d of the reflector without changing the conditions other than the reflector. I found it.

By increasing the depth of the reflector by 20%, the central illuminance is increased by 155 lx. Conversely, it was found that when a reflector having a depth of 50% was used, the illuminance energy of 155 lx was wasted inefficiently.

FIG. 5 is comparative experimental data showing changes in wide angle using the conventional reflector and the reflector of the present invention. In FIG. 5, the y-axis means the depth of the reflector, and the x-axis shows the wide angle. Two parallel lines are drawn on the x-axis at a depth of 50% and a depth of 70%. There was no particular change in spot light.

Regarding the flood light, when the beam angle (a range of 60 ° or more in the area where the illuminance was reduced to 1/2 around the optical axis) was measured, both a 50% depth reflector and a 70% depth reflector were found. There was no big change. For flood light, field angle (illuminance around the optical axis is 1
The beam angle was measured in the range of + 3 ° to + 4 ° in the area where the light was attenuated to / 10), and it was found that the field angle was 52.8 ° for the reflector with a depth of 100% and the field angle for the reflector with a depth of 70%. The angle is 52.4 °,
The depth difference between the 100% depth reflector and the 70% depth reflector was 40 mm, but the field angle difference was 0.4 °.

A further feature important in the present invention is the depth 70.
The field angle of the% reflector is 52.4 °,
The field angle of a 50% deep reflector is 50.4 °
Met. This means that the difference in depth between a 70% depth reflector and a 50% depth reflector is 20mm.
However, we have found that the difference in field angle is 2.0 °. The conventional reflector having a depth of 50% exhibits a spread of a field angle of 50.4 °, and the reflector having a depth of 70% of the present invention has a field angle of 52.4.
It showed a spread of ° C.

Without changing any conditions other than the depth d of the reflector, the difference between the field angle 52.4 ° of the reflector 70% in depth and the field angle 50.4 ° of the reflector 50% in depth 2 It can be said that ° is a very remarkable effect. Conversely, the conventional depth of 5
2% field angle difference at 0% reflector
It was wasted without irradiating the circumference range.

FIG. 6 shows a depth of 70% according to an embodiment of the present invention.
This is the illuminance data of the spot light and flat light emitted on the screen with a distance of 5 m between the spot and flat lights using the above reflector. In the figure, the field angle of flat light was 52.39 °, and the central illuminance was 1,690 lx.

FIG. 7 shows illuminance data of spot light and flat light emitted from a spot flat light using a conventional reflector having a depth of 50% at a distance of 5 m from a screen. In FIG. 7, the field angle of flat light was 50.44 °, and the central illuminance was 1,520 lx.

A spot flat light using a reflector having a depth of 70% according to an embodiment of the present invention has a field angle of about 2 ° as compared with a spot flat light using a reflector having a depth of 50%. And demonstrated an increase in illuminance of 170 lx at center illuminance.

The reflector material of the present invention is obtained by polishing the surface of a metal material, but may be one obtained by polishing the surface of glass and depositing a metal thin film such as silver or aluminum or a dielectric multilayer film.

[0030]

According to the present invention, the depth of the reflector is changed from 50% to 70% to 80% to improve the light reflection characteristics, increase the central illuminance, and provide a wide-angle light distribution. It was possible to optimize the light reflection efficiency and prevent light energy loss.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a spot flat light according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a spot flat light of a conventional example.

FIG. 3A is a diagram showing a light distribution characteristic of a current lighting fixture. (B) is an illustration of an ideal light distribution characteristic.

FIG. 4 is comparative experimental data showing changes in central illuminance.

FIG. 5 is comparative experimental data showing changes in wide angle.

FIG. 6 is illuminance data of spot light and flat light by the spot / flat light of the present invention.

FIG. 7 is illuminance data of spot light and flat light by a conventional spot flat light.

[Explanation of symbols]

 1, 1'Reflector 2, 2'Light source 3, 3'Lens 4 Lens frame

Claims (3)

[Claims] 1. A reflection efficiency, characterized in that the radius of the reflector is r, the depth of the reflector is d, and the formula: d = k · r, where 7/10 ≦ k ≦ 8/10. Optimized reflector. 2. A housing includes at least the reflector, a light source, and a lens system, the reflector is slidably arranged, and the central illuminance of flood light is high, and a wide-angle uniform light is emitted. Is a floodlight. 3. A housing includes at least the reflector, a light source, and a lens system, and the reflector and the light source are slidably arranged relative to the lens system, and a central illuminance of flood light is high. , Spot flood light, which is characterized by emitting a wide angle of uniform light.