Reflection mirror-carrying lamp

Abstract

A reflection mirror-carrying vessel capable of improving light distribution characteristics and providing a sharp spot light. The reflection mirror-carrying vessel (1) having a beam angle of 25-45 and formed on the inner surface of a reflection mirror (2) with a reflection surface (6) having an almost spheroidal surface basis shape. When the vertexes in a major-axis direction of the almost spheroidal surface are A, B and their focal points are F1,F2, and when an arbitrary point a distance, 0.75-1.65 times the line segment F1A, away from the vertex A is C, and a plane including the point C and perpendicularly crossing the major axis is P, a facet (9) is formed on the entire surface, on the vertex A side with respect to the plane P, of the reflection surface (6), with the remaining portion of the reflection surface (6) serving as a single mirror surface. When a direction from one end side toward the other end side of a reflection mirror (2) in the facet (9) is x-axis, a direction perpendicularly crossing the spheroidal surface is y-axis and a direction perpendicularly crossing the x-axis and the y-axis is z-axis, the facet (9) is curved with a first curvature R1 in the x-axis direction and curved with a curvature R2 in the z-axis direction.

Description

technical field [0001] The invention relates to lamps with reflectors. Background technique [0002] A lamp, such as a halogen bulb with a reflector, has a structure in which a halogen bulb is incorporated in a concave reflector, and is used, for example, as a spotlight in a shop or the like. [0003] On the inner surface of the reflection mirror, a reflection surface composed of a substantially spheroidal surface is formed. In addition, a plurality of small surfaces (hereinafter referred to as "facets") are formed on the entire reflective surface so as to diffuse the reflected light radiated from the halogen bulb and reflected by the reflective surface, that is, to control the reflected light to obtain a desired Light distribution characteristics (see, for example, Patent Document 1, etc.). [0004] As the shape of the facet, there are shapes such as quadrangle, triangle, circle, and rhombus, and these shapes are flat or concave-convex. [0005] In particular, in order t...

AI Technical Summary

Problems solved by technology

[0009] When the conventional halogen light bulb with reflector described in the above-mentioned Patent Document 2 is used as a wide-angle type halogen light bulb in particular, in the irradiated surface, the luminosity at the center is high and a core appears. There is no clear outline, and it becomes blurred (that is, the edge of the illuminated surface is not clear), and as a result, there is a problem of lacking the sharpness (めりくり) required for focusing

In addition, if the outline of the illuminated surface is blurred, for example, the difference in light and shade between the display items in the store and the surrounding area will become smaller, and the effect of highlighting the display items will be poor.

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