JP3205809B2 - Involute reflector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently reflects radiation from a cylindrical radiation source such as a light beam emitted from a cylindrical surface of a light emitting source such as a fluorescent tube and an infrared ray emitted from a cylindrical incandescent heater. The present invention relates to an involute reflector.

[0002]

2. Description of the Related Art Conventionally, a reflector for illumination or a reflector such as a radiation stove has a cylindrical reflector having a substantially circular cross section, or a paraboloid. The parabolic reflectors to be formed are so-called image-forming reflectors capable of forming an image with respect to a point light source or a point radiation source. Here, the imaging type reflector is effective when the light source or the radiation source is a point or a line. However, many of the actual light sources or radiation sources are cylindrical with a finite diameter, and when the cylindrical reflector or the parabolic reflector is used, light emitted from the radiator in all directions (diffused light) ) Are reflected by the cylindrical reflector or the parabolic reflector and then blocked by the radiator. Therefore, the distribution of light or thermal radiation in the opening from which the light or radiation emitted from the radiator exits becomes non-uniform in terms of intensity and direction, and the total reflection efficiency also deteriorates.

[0003] Therefore, the applicant of the present invention has proposed that the radiation emitted from the radiation source is completely and uniformly emitted from the opening without any obstruction, so that the efficiency is greatly improved and the uniform radiation is obtained. Such an involute-type reflector, that is, a shape extending in an involute curve shape symmetrically on both sides starting from a point on the outer circle of the radiation source such as a cylinder or a sphere, and a straight line connecting both ends is substantially in contact with the outer circle. (Japanese Patent Application No. 2-417) was filed earlier.
06).

When the reflecting surface is an ideal reflecting surface (reflectance 100%) and the radiation intensity on the surface of the cylindrical radiator is equal in all directions, a completely uniform radiation intensity and isotropic radiation are obtained. It is possible to obtain at the opening of the reflector.

[0005]

However, in the case of an actual radiator, light or infrared rays are not radiated equally from the surface in all circumferential directions. Therefore, when a conventional involute reflector is used, The center of the involute reflector, that is, the involute reflector that extends in a circular involute curve symmetrically on both sides starting from a point on the outer circle of the radiation source in a cross section of the reflector perpendicular to the central axis of the cylindrical radiation source. In the vicinity of the starting point, a dark area is formed, which appears as stripes, and a completely uniform radiating surface is not achieved in the reflector opening.

On the other hand, the tip of the starting point is a cusp (the tip is a point having a theoretically zero angle and a zero thickness). Therefore, when the reflector is actually manufactured by sheet metal working, extrusion molding or the like. It is difficult to process and produce the reflection plate, and the production cost is high. Further, if the cusp is used, the strength is weakened, so that it is difficult to obtain the strength of the manufactured reflector.

When the reflectance of the reflector is 100%, the involute reflector can form a uniform radiation surface at the opening of the reflector. However, in the case of a real reflecting surface such as a metal-plated surface, there are portions with slightly lower radiation intensity at both ends of the opening. It becomes difficult to make a proper radiation surface. In addition, the angle formed by the involute reflector at both ends of the reflector opening is 90 ° with respect to a straight line connecting both ends, and when forming a reflector group by arranging a large number of involute reflectors in parallel, this opening is used. The connecting portions at both side ends also become the cusps described above, and similarly to the above, there is difficulty in processing and manufacturing the reflector.

The present invention has been made in view of such a conventional situation, and an involute reflector mounted so as to cover a radiation source that does not radiate light or infrared rays equally from the surface in all circumferential directions. By improving the portion near the starting point of the involute type reflector and the portion near both sides of the opening, the light and the radiation radiated from the radiation source can be efficiently radiated, and the uniform and isotropic radiating surface is provided at the opening. It is an object of the present invention to provide an involute reflection plate capable of obtaining the following.

[0009]

For this purpose, the present invention relates to claim 1.
The invention described above is characterized in that the circular involute is mounted so as to cover the cylindrical radiation source, and the cross section of the reflector orthogonal to the central axis of the cylindrical radiation source is symmetrical on both sides starting from one point on the outer circle of the radiation source. In the reflector having a shape extending in a curved shape and having a straight line connecting both side ends substantially in contact with the outer circle, the vicinity of the starting point of the involute is defined by a circular straight line related to the involute curve.
10-20% of the diameter is deleted, and the diameter of the radiation source is
With the same amount as the amount of deletion near the start point of the involute,
Proximity in the direction of the deleted portion until it almost contacts the reflector
It is characterized by being expanded as follows.

According to a second aspect of the present invention, the involute
A plurality of G-shaped reflectors are connected. Claim 3
The invention according to the above is the involute reflector,
The distance of the straight line connecting both ends of the involute curve has been deleted
80% to 95% of the distance of the straight line connecting the both sides in front
Multiple involute reflectors with the shape near the side edges removed
It is characterized by several connections.

According to a fourth aspect of the present invention, the reflector is mounted so as to cover the cylindrical radiation source, and the cross section of the reflector orthogonal to the central axis of the cylindrical radiation source is defined by a point on the outer circle of the radiation source as a starting point. A reflector extending in a symmetrical shape on both sides in the shape of the circular involute curve and having a shape in which a straight line connecting both ends is substantially in contact with the outer circle, and in which a predetermined amount of the vicinity of both ends of the involute curve is deleted by a predetermined amount; Board or
In the involute reflector in which a plurality of involute reflectors of this shape are connected, a straight line direction connecting the both ends to the outermost edge corresponding to the deleted portion of the involute reflector constituting the outermost edge. Vertical reflection surface provided
It is characterized by the following.

According to a fifth aspect of the present invention, the predetermined amount relating to the deletion near the both ends is the distance connecting the two ends after the predetermined amount of deletion near the both ends is the distance connecting the both ends before the deletion. Characterized in that the amount is 80 to 95% of
You.

[0013]

[0014] The invention according to claim 6, have a shape which leads to the annular covering the cylindrical radiation source center axis leads to an annular
It is characterized by having done.

[0015]

According to the above construction, the reflector is mounted so as to cover the cylindrical radiation source, and the cross section of the reflector orthogonal to the central axis of the cylindrical radiation source is symmetrical with respect to both sides starting from one point on the outer circle of the radiation source. A reflector extending in the shape of a circular involute curve and having a shape in which a straight line connecting both ends is substantially in contact with the outer circle, wherein the radiation source does not emit light or infrared light equally from the surface in all circumferential directions. Even if there is a portion with slightly lower radiation intensity at both ends of the opening, such as a real reflecting surface, the light radiated from the radiation source and the radiation can be efficiently radiated. , It is possible to obtain a uniform and isotropic radiation surface at the opening,
The operation will be described later.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention, in which an involute reflector according to the present invention is applied to a lighting fixture. In the figure, a fluorescent tube 5, which is a cylindrical radiation source, is attached to an instrument body (not shown) by a socket (not shown), and covers a lower portion and both side portions of the fluorescent tube 5, and has a cross-section involute in which an upper surface is opened in the drawing. A reflector 8 having a rectangular shape is attached.

Here, the reflector 8 having an involute cross section is used.
Is a reference circle represented by x = r (ωcosω−sinω) y = −r (ωsinω + cosω + 1) with respect to an x-axis and a y-axis having a point on the reference circle 1 having a radius r shown in FIG. It extends in the form of a reference circular involute curve symmetrically on both sides with one point on 1 as a starting point. Here, ω is a variable related to the involute curve.
By substituting ω = 0, the variable becomes a starting point at one point K on the reference circle 1 and changes from −π to π.

That is, when ω = π is substituted, x = −r, y
= 0 and point A in the figure, and substituting ω = −π, x =
At r, y = 0, the point becomes A 'in the figure. Here, as a configuration according to the present invention, the reflection plate 8 is located at one point K on the reference circle 1.
As shown in FIG. 2, it has a shape deleted by a predetermined amount k, and the left reflector 8a and the right reflector 8b of the involute reflector 8 are connected by a flat plate 15 at M and N points. I have. Further, in this embodiment, the predetermined amount k is 10% of the diameter φd (= 2r) of the reference circle 1.

The fluorescent tube 5 (the center point G) is formed by the fluorescent tube 5 along the y-axis, that is, in the direction connecting the center C of the reference circle 1 and the starting point K. It is located at the position moved until it touches 15. In this embodiment, the diameter φf of the fluorescent tube 5 is increased by 10% with respect to the diameter φd of the reference circle 1. Therefore, in this embodiment, the fluorescent tube 5 also passes through the origin.

Further, the involute reflector 8 has a shape in which the predetermined amount s is deleted in the vicinity of the points A and A ', and the end points are the points E and E', respectively. further,
In this embodiment, the distance v connecting the points E and E 'at both ends after the predetermined amount s has been deleted from the vicinity of the points A and A'.
However, the predetermined amount s is determined so as to be 95% of the distance (2πr) connecting the both ends before the deletion.

In the first embodiment, the involute reflector 8 is located along the y-axis at points E and E 'on both sides of the left reflector 8a and the right reflector 8b of the involute reflector 8. By arranging the plane mirrors 11 and 12 on the plane perpendicular to AOA ', which is the opening plane of 8, with the mirror surfaces 11a and 12a facing the center respectively, a reflecting surface perpendicular to the AOA' is provided. I have to. The length of the plane mirrors 11 and 12 is x-axis (opening plane AOA ') from the end points E and E' on both sides.
And the mirror surfaces of the plane mirrors 11 and 12
The intersections of 11a, 12a and the x-axis are B and B ', respectively.

Next, the operation of the first embodiment will be described.
If a radiation source exists on the reference circle 1, the Japanese Patent Application Hei 2-4
As described in No. 1706, the radiation flux radiated from one point R on the reference circle 1 completely passes through the exit aperture plane AOA 'without being blocked by the surface of the reference circle 1 which is a radiation source and is out of the system. Will be injected.

At a point P on the fluorescent tube 5 as a radiation surface in FIG. 1, radiant energy is emitted in all hemispherical directions. And the position is shifted. further,
The reflector 8 has a predetermined amount s near the points A and A ′.
Only the shape is deleted. That is, a part of the radiant energy emitted from one point P on the fluorescent tube 5 is directed toward the fluorescent tube 5, and thus the emission efficiency is slightly deviated from the ideal involute type reflection plate. It will decrease slightly.

However, according to the above configuration, FIG.
As shown in FIG. 1, the relative luminance distribution viewed from the y-axis direction in FIG. 1 becomes more uniform. That is, in the conventional involute-type reflector (shown by a dotted line in FIG. 3), a cusp exists at the starting point, and unevenness of the luminance distribution due to the thickness of the cover glass of the fluorescent tube 5 occurs. Due to the influence, as shown in FIG. 3, the reflection plate opening position x / πr is substantially
At 0.3 and approximately 0.8, the luminance distribution was extremely small (points H and I in FIG. 3). However, the reflecting plate 8 is deleted at a point K on the reference circle 1 by a predetermined amount k, the fluorescent tube 5 is disposed at a position moved until it comes into contact with the flat plate 15, and the diameter φf of the fluorescent tube 5 is further enlarged. By doing
Brightness is greatly improved (points H 'and I' in FIG. 3)
Was confirmed from the numerical calculation results.

Further, in the case of a real reflecting surface such as a metal-plated surface, there are portions with slightly lower radiation intensity at both ends of the opening. Therefore, in the case of a real reflecting plate, both ends of the opening, That is, when the opening position x / πr of the reflector was approximately 1.0, the luminance distribution was extremely reduced to approximately 0.5 (point J in FIG. 3). However, the reflector 8 is deleted by a predetermined amount s in the vicinity of the points A and A 'to remove a portion where the luminance distribution is small, and the both ends of the left reflector 8a and the right reflector 8b are removed. By arranging the mirror surfaces 11a and 12a at points E and E ', it works as if another involute-type reflector 8 is present continuously to the reflectors 8a and 8b, so that the luminance is greatly improved. (J 'in FIG. 3)
Point) was confirmed from the numerical calculation results.

It should be noted that the above-described numerical calculation results indicate that the predetermined amount k is 10% of the diameter φd, and the fluorescent tube 5 having the diameter φf expanded by 10% with respect to the reference circle 1 is brought into contact with the flat plate 15.
Also, this is the result for the case where the distance v connecting the points E and E 'at both ends after the predetermined amount s is deleted is 95% as described above, but calculation is performed for various predetermined amounts until the result is obtained. Is performed, and the result is obtained, and a preferable example of the predetermined amount is shown.

Here, numerical calculation results regarding various predetermined amounts will be described by taking the predetermined amount s as an example. That is, FIGS. 4 and 5 show the relationship between the relative luminance, the opening position x / πr, and the accrual angle θ when the predetermined amount s is changed to various predetermined values. Here, in order to examine the directional emission characteristics of the radiant energy at the opening, the relative radiant intensity obtained by dividing the directional radiant intensity at the opening by the radiant intensity at the same angle on the radiating surface is the relative luminance, and the relative luminance is relative to the y-axis. The origin O
Is the accrual angle θ. In the figure,
The foremost position corresponds to θ = 0, and is shown at intervals of 12 °.

FIG. 4 illustrates the relative luminance of an involute reflector in which both ends are not deleted at all when the predetermined amount s is set to 0. According to FIG. 4, for the case where both ends where the predetermined amount s is 0 are not deleted at all, θ = 0,12
, The reflector opening position x / πr is approximately 1.0 and −1.0,
That is, it can be seen that the relative luminance distribution is extremely small at both ends, and that the reflecting plate has an uneven radiation surface at both ends.

On the other hand, FIG. 5 shows a case where the predetermined amount s is determined so that the distance v becomes 95% of the distance connecting the both ends before deletion, and the relative luminance distribution at both ends is improved. It turns out that there is. At this time, the emission efficiency η (= radiant energy emitted from the opening / radiant energy emitted from the cylindrical radiation surface) is 91% (in the case of FIG. 4, η = 94).
%).

FIG. 6 shows a case where the predetermined amount s is determined so that the distance v is 83% of the distance connecting the both ends before deletion, and the relative luminance distribution is greatly improved. You can see that However, the injection efficiency η has been reduced to 80%. Therefore, from the numerical calculation results, the predetermined amount s related to the deletion of the vicinity of the both ends is a distance connecting the both ends after the predetermined amount of deletion near the both ends is at least 80 of the distance connecting the both ends before the deletion. % Is desirable.

As described above, by improving the portion near the starting point K and the portions near both ends A and A 'of the opening of the involute reflector 8, the light emitted from the fluorescent tube 5, which is the radiation source, is improved. Light can be efficiently emitted, and a uniform and isotropic radiation surface can be obtained at the opening BOB '. Further, since the reflector 8 has a shape obtained by deleting a predetermined amount k at one point K on the reference circle 1, there is no cusp at the tip of the start point, and the reflector 8
Processing becomes easier, leading to a reduction in manufacturing costs. Further, in the first embodiment, since the left reflecting plate 8a and the right reflecting plate 8b are connected by the flat plate 15, the strength becomes strong, and the strength of the involute reflecting plate 8 can be secured.

As a second embodiment of the present invention, as shown in FIG. 7, fluorescent tubes 35, 45 and 55 which are cylindrical radiation sources are used.
On the other hand, there is a type in which three involute reflectors are connected and arranged in parallel. That is, the involute reflector
31 includes a left reflector 31a and a right reflector 31b. Similarly, the involute reflectors 41 and 51 are 41a,
It comprises 41b and 51a, 51b. Here, each of the involute type reflectors 31, 41 and 51 is the first of the present invention.
It is roughly constituted by the involute type reflection plate 8 shown as the embodiment. However, the reflection plate 31b and the reflection plate 41a are connected at a connection portion 61, and the reflection plate 41b and the reflection plate 51a are connected at a connection portion 62. Also, the reflection plate 31a and the reflection plate
Involute reflector at both ends 32, 52 of 51b
Plane mirrors 67 and 68 are disposed on the surfaces perpendicular to the opening surface 65 of 31, 41 and 51 with the mirror surfaces 67a and 68a facing the center. still,
The length of the plane mirrors 67, 68 is larger than the length of the side edges 32, 52 by the opening surface 65.
And the mirror surfaces of the plane mirrors 67 and 68
The intersections of 11a, 12a and the opening surface 65 are 33, 53, respectively.

Also in the second embodiment, in each of the involute type reflectors 31, 41 and 51, each reflector is deleted by the predetermined amount k and the fluorescent tubes 35, 45 and 55 are moved. By arranging the fluorescent lamps at the specified positions and further increasing the diameters of the fluorescent tubes 35, 45, and 55, the luminance is greatly improved. In addition, the influence of the slightly lower radiation intensity on both sides of the opening,
Since each of the involute reflectors 31, 41 and 51 are connected by the connecting portions 61 and 62, portions where the luminance distribution is small can be deleted.
By arranging 7, 68, the luminance is greatly improved.

Further, also in the second embodiment, there is no cusp at the tip of the starting point, and the processing and production of each of the involute reflectors 31, 41 and 51 are facilitated, and the production cost is reduced. Leads to. Also, as is apparent from the second embodiment, the involute type reflectors 31, 41 and 51 and the fluorescent tubes 35, 45 and
With a configuration in which the total height L including the height 55 is reduced, a lighting fixture with high emission efficiency can be configured, which is advantageous, for example, when embedded in a ceiling.

In the above-described embodiment, in the reflecting plate which is mounted so as to cover the cylindrical heat source instead of the fluorescent tube 5 and the fluorescent tubes 35, 45 and 55 and reflects the radiation from the heat source, the center of the heat source is provided. The shape of the cross section of the reflector perpendicular to the axis is
The shape is the same in the central axis direction, and extends in a circular involute curve shape symmetrically on both sides starting from a point of the outer circular shape of the heat source cross section, and a straight line connecting both ends is substantially in contact with the outer contour circle, Even if improvements are made to the vicinity of the starting point and the vicinity of both sides of the opening of the involute reflector,
The same operation and effect as described above can be achieved, while the object can be uniformly warmed.

In the embodiment described above, the cylindrical radiation source such as the fluorescent tube 5 and the fluorescent tubes 35, 45 and 55 has a shape in which the central axis is connected in a ring shape, and the involute reflector 8 or Even if the starting point of the cross section of 31, 41 and 51 is a shape positioned near the contact point on a plane that is in contact with the radiation source in parallel with the plane including the central axis of the radiation source, the same operation and effect as described above Will be played.

As described above, according to the present invention, the reflector is mounted so as to cover the cylindrical radiation source, and the cross section of the reflector perpendicular to the central axis of the cylindrical radiation source is positioned at one point on the outer circle of the radiation source. In the reflector having a shape in which a straight line connecting both ends symmetrically extends in the shape of a circular involute curve symmetrically on both sides as a starting point, and a shape in which a straight line connecting both ends is substantially in contact with the outer circle, the involute-shaped reflector near the starting point has a circular diameter of the involute curve.
Remove 10-20% equivalent amounts, the radiation source to expand the diameter of the radiation source to be substantially in contact with said involute reflector, and the distance of a straight line connecting both side ends of the involute curve, cutting
It will be 80-95% of the distance of the straight line connecting both ends before removal
Even if the radiation source is a radiation source that does not radiate light or infrared light equally from the surface in the entire circumferential direction, by removing the vicinity of the side edge, it is also possible to remove both ends of the opening like a real reflecting surface. In that, even if there is a portion with a small radiation intensity, it is possible to efficiently radiate light or radiation radiated from the radiation source and obtain a uniform and isotropic radiation surface at the opening. At the same time, there is an effect that the processing and production of the involute type reflection plate become easy, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an involute reflector according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion K in FIG. 1;

FIG. 3 is a relative luminance distribution diagram for explaining the operation and effect according to the embodiment.

FIG. 4 is a relative luminance distribution diagram for explaining the operation and effect according to the embodiment.

FIG. 5 is a relative luminance distribution diagram illustrating the operation and effect according to the embodiment.

FIG. 6 is a relative luminance distribution diagram illustrating the operation and effect according to the embodiment.

FIG. 7 is a schematic sectional view of an involute reflector showing a second embodiment of the present invention.

[Explanation of symbols]

 5 Fluorescent tube 8 Involute reflector 11 Plane mirror 12 Plane mirror 31 Involute reflector 35 Fluorescent tube 41 Involute reflector 45 Fluorescent tube 51 Involute reflector 55 Fluorescent tube

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-59-104048 (JP, A) JP-A-64-63202 (JP, A) JP-A-62-188102 (JP, A) JP-A 51-104 19542 (JP, A) JP-A-52-57525 (JP, A) JP-A-57-148702 (JP, A) JP-A-58-135654 (JP, U) JP-A-60-15709 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 5/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04 F21V 1/00-37/00

Claims (6)

(57) [Claims] 1. A reflector mounted over a cylindrical radiation source, wherein a cross section of a reflector perpendicular to a central axis of the cylindrical radiation source is symmetrical with respect to both sides starting from a point on an outer circle of the radiation source. A reflector extending in an involute curve shape and having a shape in which a straight line connecting both ends is substantially in contact with the outer circle, the vicinity of the starting point of the involute, a circular shape related to the involute curve
Remove the equivalent of 10 to 20% of the diameter, the diameter of the radiation source
Is substantially the same as the amount of deletion near the start point of the involute.
In the direction of the part to be removed until it almost contacts the reflector.
An involute reflector characterized by having been enlarged so that 2. A plurality of said involute reflectors are connected.
The involute type according to claim 1, wherein
reflector. 3. The involute reflector according to claim 1, wherein
Before the deletion, the distance between the straight lines connecting both ends of the
Side that is 80-95% of the distance of the straight line connecting the both ends of
Multiple involute-shaped reflectors with shapes near the edges removed
The involute according to claim 1, wherein the involute is connected.
Port-shaped reflector. 4. A reflector mounted over a cylindrical radiation source, wherein a cross section of a reflector orthogonal to a central axis of the cylindrical radiation source is symmetrical with respect to both sides starting from a point on an outer circle of the radiation source. An involute reflector that extends in the form of an involute curve and has a shape in which a straight line connecting both ends is approximately in contact with the outer circle, and in which a predetermined amount of the vicinity of both ends of the involute curve is deleted . Involute
In the involute reflector having a plurality of reflectors connected to each other, a surface perpendicular to the straight line direction connecting the both ends to the outermost edge corresponding to the deleted portion of the involute reflector constituting the outermost edge An involute reflector having a reflective surface. 5. A distance connecting the two ends after the predetermined amount of deletion near the both ends is deleted is 80 to 95% of a distance connecting the two ends before the deletion. The involute reflector according to claim 4, wherein the amount is as follows. 6. A cylindrical radiation source whose center axis is connected in an annular shape.
A contractor characterized by having a shape that covers and connects to a ring
An involut according to any one of claims 1 to 5.
Port-shaped reflector.