JPS6348889Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to a reflecting mirror for rectangular light distribution.

[Background technology]

Conventional square light distribution reflectors are shown in Figures 1 to 3.
As shown in the figure, it is applied to a floodlight, and, for example, a 100W (watt) mini halogen bulb is used to provide light distribution in a 2m square square as shown in Figure 4 at a height of 2m (meters). In the figure, 1 is a ceiling mounting flange, 2 is a rotation/oscillation/connection part, 3 is the appliance body, 4 is a reflector, 5 is a shade, 6 is a mini halogen light bulb, 7 is a lamp socket, and 8 is a mounting screw. Also, in the light distribution curve (Figure 4), Q ₁ is
246lx (lux), Q ₂ is 200lx, Q ₃ is 150lx, Q ₄ is
It shows 100lx. Note that the lamp may be an HID lamp or an incandescent lamp.

However, since this reflecting mirror 4 has a rectangular horizontal cross section, a lamp 6 is placed within a range of about 1/4l (l is the length of one side) from the end of one side 4a (corner 4') as shown in FIG. The other side 4b adjacent to which the light δ ₁ incident from
The secondary reflected light δ 2 was incident on the reflective surface of the device, and the secondary reflected light δ ₂ was irradiating the downward direction of the device, resulting in a low device efficiency of about 65%. In addition, in the vertical section, the shading angle θ ₁ of the light incident on the center 4a' of the side 4a is 33 degrees as shown in Figure 7, while the shading angle θ ₂ of the light directed toward the corner 4' is 24 degrees. The shortcoming was that there was a difference in glare of approximately 10 degrees. Furthermore, if the reflecting mirror 4 is drawn in one piece, it is difficult to form because wrinkles and breakage are likely to occur depending on the depth. It had to be manufactured in a step-by-step manner, resulting in poor productivity.

There were also devices in which the inner surface of the reflector plate was formed into a step-like shape in the direction of the opening (for example,
22865) is difficult to mold as mentioned above, and the reflection angle of the reflection surface of the staircase part is horizontal rather than vertically downward, so in the case of a large light source such as an HID lamp, the reflected light will enter the light source. Therefore, it had the disadvantage of causing a decrease in efficiency.

[Purpose of invention]

Therefore, the purpose of this invention is to provide a rectangular light distribution reflector that can increase the efficiency of the device, reduce the difference in the shading angle, be easily molded, and improve productivity.

[Disclosure of invention]

The rectangular light distribution reflector of this invention has a first reflector whose horizontal cross section has a round umbrella shape including a circle and an ellipse, and which illuminates an irradiated surface having a shape similar to the round shape;
The reflecting surface is connected to the lower end opening of the first reflecting mirror and has a ring shape similar to the round shape of the lower end opening, and is divided into many parts in the circumferential direction by forming the inner peripheral surface in a pleated shape. and a second reflecting mirror that irradiates four spaces between the irradiated surface and a rectangle circumscribing the irradiated surface, each space having a center of the lower opening in between. The area of 1/4 of the inner circumferential surface on the opposite side is illuminated separately.

According to the configuration of this invention, the first reflecting mirror illuminates the irradiated surface in a round shape, and the second reflecting mirror illuminates the area between the rectangle circumscribing the round shape and the round shape.
Since each space is illuminated, a rectangular light distribution is obtained as a whole. Moreover, the second reflecting mirror is formed in a pleat shape in the circumferential direction of the inner circumferential surface, and has a round ring shape similar to the first reflecting mirror, and is connected to the lower end opening of the first reflecting mirror. Compared to the conventional method, it is significantly easier to mold and productivity can be improved, and there is no secondary reflected light that occurs at conventional corners, and there is less reflected light to the light source, so the efficiency of the device can be increased. Moreover, since it is round, the difference in the light shielding angle can be reduced.

The first embodiment of this invention is shown in Figures 8 to 11.
As shown in the figure. In other words, this square light distribution reflector is
It consists of a first reflecting mirror 9 and a second reflecting mirror 10. The first reflecting mirror 9 has a round umbrella shape whose horizontal cross section includes a circular paraboloid. Second reflector 1
0 has a circular ring shape that is integrally stepped and connected to the opening edge of the first reflecting mirror 9, and the inner peripheral surface is divided into a large number of reflecting surfaces 11 in a pleated shape. These reflective surfaces 1
1 is a group of reflective surfaces having the same shape in the 1/4 range PS, SR, RQ, and QP divided into four in the circumferential direction based on the center O in the horizontal cross section of the reflective mirror 10, as shown in FIG. None, and in each 1/4 range, the lines connecting the center and the center OW, OV, OU,
It has a symmetrical shape with the OT as the border. In a 1/8th range, for example, range PW, the reflective surface is divided into three parts, and the first reflective surface 11a is located at one end P in the circumferential direction.
produces reflected light N ₁ at 45 degrees with respect to the U-W axis, and the other end P ₁ is inscribed in the circumscribed circle X and produces reflected light N ₂ at 42 degrees, and the reflected light between them is from 45 degrees to 42
It forms a concave curved surface that changes continuously. The second reflective surface 11b has one end stepped to the other end _P1 to produce a 42-degree reflected light _N2 , and the other end _P2 inscribed in the circumscribed circle X to produce a 36-degree reflected light _N3 . , and the reflected light between them forms a concave curved surface that changes continuously from 42 degrees to 36 degrees. One end of the third reflective surface 11c is the other end.
_P2 is stepped to create a 36 degree reflected light, and the other end W is inscribed in the circumscribed circle X and produces an 11 degree reflected light
N ₄ is created, and the reflected light between them forms a concave curved surface that changes continuously from 36 degrees to 11 degrees. The reflective surface groups 12a, 12b, 12c of the 1/8 range WS, which is the remaining half of the 1/4 range PS, are formed symmetrically with respect to the line OW, and the other 1/4 ranges SR, RQ, The reflective surface group in QP is the same as the range PS, so the explanation will be omitted.

FIG. 11 shows the irradiated surface irradiated by this reflecting mirror. A round irradiated surface 13, of which a circular shape is an example, is irradiated by the first reflecting mirror 9. Four spaces 15a to 15d between this irradiated surface 13 and the virtual square EFGH circumscribing it
is irradiated by a group of reflecting surfaces each covering a quarter of the second reflecting mirror 10. Specifically, a group of reflective surfaces in one 1/4 range PS illuminates a space (for example, 15a) that is point symmetrical with respect to the centers O and O'.
Then, the symmetrical 1/2 range of the space 15a (one of the areas partitioned by the line O′E) is divided into the 1/8
The range PW is in charge, and the first reflective surface 11a is the area
The _second reflective surface 11b illuminates the area _B1 , and the third reflective surface 11c illuminates the area _C1 . The same applies to others. Note that the reflective surface 11c
The reason why the area from 11 degrees to 0 degrees is not irradiated is because the corresponding area of the space 15a is close to a line and has little effect on rectangular irradiation.

With this configuration, as is clear from the reflected light, there is no secondary reflection and less light is reflected back to the light source, so the efficiency of the appliance can be increased. According to experiments, the efficiency of the device could be increased to approximately 80%. Furthermore, since the conventional corners have been removed and the shape is almost circular, the difference in the light shielding angle can be reduced. Furthermore, it becomes possible to perform integral drawing by hydraulic forming or the like.

As a modification of this embodiment, the reflective surface 11a
~11c is further divided into reflective surfaces 11a~11
Although the angle c seen from the center O has a width of 15 degrees, it may have a width of 7.5 degrees as shown by range QR in Figure 8, and the number of divisions can be determined to illuminate the space mentioned above. As long as it is possible, no questions will be asked.

A second embodiment of this invention is shown in FIG. That is, this rectangular light distribution reflecting mirror has a first reflecting mirror 9' and a second reflecting mirror 10' configured separately, and a flange 14 is provided on the edge of the first reflecting mirror 9'. A push screw 16 is provided on the second reflecting mirror 10', and the push screw 16 is engaged with the flange 14, thereby attaching it removably. This allows switching between circular light distribution and square light distribution as appropriate. The rest is the same as the first embodiment.

In other embodiments, the horizontal cross-sections of the first and second reflecting mirrors may be ellipsoids or other oblong shapes. In this case, although the reflecting surface of the second reflecting mirror is symmetrical with respect to the center, it goes without saying that the shapes in the long axis direction and the short axis direction of the quartered range are different from each other.

[Effect of idea]

As described above, according to the rectangular light distribution reflector of this invention, the first reflector illuminates the irradiated surface in a round shape, and the second reflector illuminates the rectangle circumscribing the round shape. Since the four spaces between the round shapes are illuminated, a rectangular light distribution is obtained as a whole. Moreover, the second reflecting mirror is formed in a pleated shape in the circumferential direction of the inner peripheral surface, and has a round ring shape similar to the first reflecting mirror, and is connected to the lower end opening of the first reflecting mirror. Compared to the conventional method, it is significantly easier to mold and productivity can be improved, and there is no secondary reflected light that occurs at conventional corners, and there is less reflected light to the light source, so the efficiency of the device can be increased. Moreover, since it is round, it has the effect of reducing the difference in the light shielding angle.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional floodlight, Fig. 2 is a side view, Fig. 3 is a front view, Fig. 4 is a light distribution curve, and Fig. 5 is a perspective view of a reflector. 6 is a sectional view showing secondary reflection in the cross section, FIG. 7 is a half sectional view showing the difference in the shielding angle in the longitudinal section of the reflector, and FIG. 8 is a second embodiment of the first embodiment of this invention. 9 is a cross-sectional view of the reflecting mirror, FIG. 10 is a half-sectional side view of the reflecting mirror, FIG. 10 is a half-bottom view of the reflecting mirror, and FIG.
The figure is a plan view of the irradiation surface showing the irradiation state, and FIG. 12 is a partial sectional view of the second embodiment. 9, 9'...first reflecting mirror, 10,10'...second reflecting mirror, 11a-11c, 12a-12c...
...Reflecting surface, 13...Irradiated surface, 15a to 15d...
...Space, O, O'...Center.

Claims (1)

[Claims for Utility Model Registration] (1) A first reflecting mirror whose horizontal cross section has a round umbrella shape including a circle and an ellipse and illuminates an irradiated surface having a shape similar to the round shape; The reflecting mirror has a ring-shaped reflecting surface connected to the lower end opening of the reflecting mirror, which is similar in shape to the round shape of the lower end opening, and is divided into many parts in the circumferential direction by forming the inner peripheral surface in a pleated shape. a second beam that irradiates four spaces between the irradiated surface and a rectangle circumscribing the irradiated surface;
a reflecting mirror, and each space is provided with a 1/1/2 inch reflector of the inner circumferential surface on the opposite side with the center of the lower end opening in between.
A reflector for rectangular light distribution, characterized in that four areas are each illuminated separately. (2) The rectangular light distribution reflector according to claim 1, wherein the second reflector is detachably attached to the first reflector.