JPH0215211Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the structure of a minute reflective surface of a concave reflector used in a halogen light bulb. The concave reflector 3 is arranged approximately at the center of the reflector 3 at a right angle to the center line _L1 of the concave reflector 3, and the reflective surface 4 of the concave reflector 3 is configured into a compound eye shape with a large number of minute reflective surfaces 5. The reflective surface 4 is divided into a fan-shaped portion 6 and a residual portion 7 that extend on both sides of the filament 2 center line L ₂ on both sides of the center line L ₁ of the filament 2, and the minute reflective surface 5 of the fan-shaped portion 6 is Fan-shaped main point 8
The micro reflective surface 5 of the remaining portion 7 is formed into a cylindrical surface centered on the concentric circle of the reflective surface 4 of the concave reflecting mirror 3. The present invention relates to a structure of a minute reflecting surface of a concave reflecting mirror.

The concave reflector 3' for the conventional halogen light bulb 1' is
As shown in FIGS. 6 and 7, a continuous paraboloid was used as the reflecting surface 4', or a small spherical depression 13' was simply formed in the parabolic reflecting surface 4'. When a halogen light bulb 1' is attached to a concave reflector 3' having such a reflective surface 4' for illumination,
In the former case, as shown in Fig. 8, the reflected light is irradiated according to the shape of the filament 2',
Parts of the irradiated surface 12' are strongly illuminated and other parts are weakly illuminated, resulting in uneven luminance on the irradiated surface 12' {the shaded areas have high luminous intensity, and the crossed areas have low luminous intensity. } There was a drawback. Moreover, in the latter case, the irregular reflection by the depression 13' is only promoted, but the unevenness of the luminous intensity on the irradiated surface 12' is not eliminated.

The present invention was devised in view of the drawbacks of the conventional examples, and its purpose is that even if the filament formed in a cylindrical shape is arranged almost at right angles to the center line of the concave reflecting mirror, Another object of the present invention is to provide a structure of a minute reflecting surface of a concave reflecting mirror that does not cause unevenness in luminous intensity over the entire irradiated surface.

The present invention will be explained in detail below. FIG. 1 is a half-sectional view of a concave reflecting mirror 3 according to a first embodiment of the present invention.
A light bulb mounting tube 14 is provided at the center of the bottom of the concave reflector 3 to protrude outward, and a mounting hole 15 of the light bulb mounting tube 14 is provided.
The pinch seal part of the halogen light bulb 1 is glued to the. The filament 2 of the halogen light bulb 1 is wound into a cylindrical shape (in other words, a cylindrical shape or a rectangular cylindrical shape), and is arranged approximately at right angles to the center line _L1 of the concave reflecting mirror 3. That is, C6 or
You will be using a halogen bulb 1 with a CC6 filament. Next, the shape of the concave reflecting mirror 3 will be explained. The reflective surface 4 is configured in a compound manner by a large number of small trapezoidal reflective surfaces 5 surrounded by radiation 9 emitted from the center of the concave reflective mirror 3 and concentric circles of the reflective surface 4. Here, the minute reflection surface of the fan-shaped portion 6 is assumed to be 5a, and the minute reflection surface of the remaining portion 7 is assumed to be 5d. The reflective surface 4 of the concave reflector 3 is aligned with the center line of the concave reflector 3.
A fan-shaped portion 6 and a residual portion 7 extending on both sides of the filament 2 centering on the center line L ₂ of the filament 2 on both sides of L ₁
The opening angle θ of the fan-shaped portion 6 is usually between about 30° and 60°. The minute reflective surface 5a of the fan-shaped portion 6 is formed in a cylindrical shape centered on the radiation 9 emitted from the center of the concave reflecting mirror 3 {in this case, the point 8 of the fan shape}, and the minute reflective surface 5a of the remaining portion 7
d is formed into a cylindrical shape centered on a concentric circle of the reflecting surface 4 of the concave reflecting mirror 3. Here, the cylindrical surface may be a convex cylindrical surface, or conversely may be a concave cylindrical surface. In the case of a convex cylindrical surface, the radius of curvature of the minute reflection surfaces 5a, 5d is reflected by the minute reflection surfaces 5a, 5d,
The small irradiation surface 16 that illuminates the irradiation surface 12 becomes a square {the short side of the small irradiation surface 16 irradiated by the small reflection surfaces 5a and 5d is expanded to approximately the same length as the long side, and becomes a square. }Dimensions are selected. Similarly, in the case of a concave cylindrical surface, the radius of curvature of the minute reflection surfaces 5b and 5e is expanded to the same dimension as the long side after the light reflected on the short side reflected by the minute reflection surfaces 5a and 5d crosses once, and the irradiation Micro-illuminated surface 16 that illuminates surface 12
The dimensions are chosen so that is a square. The reflective surface 4 of the concave reflector 3 is coated with a multilayer coating, so that only visible rays of the light emitted from the halogen bulb 1 are reflected forward, and infrared rays are reflected forward by the concave reflector 3.
It has a structure that allows it to pass through the back. Therefore, when the halogen bulb 1 is turned on, the filament 2
is heated and emits light, and most of the visible light is reflected forward at the minute irradiation surfaces 5a and 5d. The visible light reflected by the micro irradiation surfaces 5a and 5d forms a square micro irradiation surface 16 on the entire surface of the irradiation surface 12, and the adjacent square micro irradiation surfaces 16 overlap each other to form the irradiation surface. 12 is irradiated with uniform light intensity. Next, second and third embodiments of the present invention will be described with reference to FIGS. 4 and 5. In this example,
The starting point of the boundary line between the fan-shaped portion 6 and the remaining portion 7 is set at a position that coincides with the end of the filament 2 when viewed from the front, and the latch 8 of the fan-shaped portion 6 (in this case, the latch 8 is spaced apart from side to side). } The radiation 9 is emitted from the position. Conversely, the radiation 9 may be emitted from the center of the concave reflecting mirror 3, or the radiation 9 may be emitted from a point symmetrically away from the center (however, a position between the points 8 and 8). In this case, compared to the first embodiment, the area of the remaining portion 7 is larger than that of the fan-shaped portion 6, and this is effective when the filament 2 is long.

As described above, the present invention consists of arranging the filament of a halogen light bulb wound into a cylindrical shape at approximately the center of the concave reflector and approximately perpendicular to the center line of the concave reflector. It is configured in a compound eye shape with a minute irradiation surface, and the reflecting surface is divided into a fan-shaped part and a residual part that spread on both sides of the filament center line on both sides of the center line of the concave reflector. The irradiation surface is formed into a cylindrical surface centered on the radiation emitted from the fan-shaped key position or the point between the key points,
Since the remaining minute irradiation surface is formed into a cylindrical shape centered on the concentric circle of the reflective surface of the concave reflector,
The rectangular light emitted from the filament is reflected by the fan-shaped part and the remaining part, and its short side is expanded to almost the same length as its long side, forming a nearly square image on the irradiated surface, and these square images are adjacent to each other. There is an advantage that the light beams overlap each other and illuminate the entire irradiation surface with uniform luminous intensity.

[Brief explanation of the drawing]

Fig. 1: Half sectional view of the first embodiment of the present invention, Fig. 2: Front view of the first embodiment of the present invention, Fig. 3:
...Front view of the irradiation surface according to the present invention, Fig. 4...Front view of the second embodiment of the present invention, Fig. 5...Front view of the third embodiment of the present invention, Fig. 6...Front view of the conventional example Half sectional view, Fig. 7...Half sectional view of another conventional example, Fig. 8...
...A front view of an irradiation view according to a conventional example. 1...Halogen light bulb, 2...Filament, 3
...Concave reflecting mirror, 4...Reflecting surface, 5...Minute reflecting surface, 6...Fan shaped part, 7...Remaining part, 8...
Essential, 9...radiation, 10...concentric circles, 11...boundary line.

Claims (1)

[Claims for Utility Model Registration] (1) The filament of a halogen light bulb wound into a cylindrical shape is arranged approximately at the center of the concave reflector and approximately perpendicular to the center line of the concave reflector, so that the reflective surface of the concave reflector is It is composed of a large number of minute reflective surfaces in a compound eye shape, and the reflective surface is divided into a fan-shaped part and a residual part that spread out on both sides of the filament center line on both sides of the center line of the concave reflector, and the fan-shaped part The micro-reflecting surface is formed into a cylindrical surface centered on the radiation emitted from the key position or the point between the fan-shaped points, and the remaining micro-reflecting surface is formed into a cylindrical surface centered on the concentric circle of the reflecting surface of the concave reflecting mirror. The structure of a minute reflective surface of a concave reflective mirror is characterized by being formed into a shape. (2) The structure of the minute reflecting surface of the concave reflecting mirror according to claim 1, wherein the opening angle of the fan-shaped portion is any angle between 30° and 60°. (3) The scope of claim 1 for registration of a utility model, which is characterized in that the minute reflecting surface is a substantially trapezoidal surface surrounded by concentric circles centered on the radiation emitted from the center of the concave reflecting mirror and the center of the reflecting surface. Structure of the minute reflective surface of the described concave reflector. (4) A microscopic concave reflector according to claim 1 of the utility model registration claim, characterized in that the starting point of the boundary line between the fan-shaped portion and the remaining portion is located at a position that coincides with the end of the filament when viewed from the front. Structure of reflective surface. (5) The structure of the minute reflecting surface of the concave reflecting mirror according to claim 4 of the utility model registration, characterized in that radiation is emitted from key positions of the fan-shaped portion.