JPS63121201A - Projector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a light projecting device, and more particularly, to a reflecting mirror with increased center luminous intensity in a projector or the like.

(Prior Art) In a conventional projector of this type, the reflector has a band-shaped reflecting surface formed of a quadratic curved surface, for example, a paraboloid, and a lamp is placed near the focal point on the front side of this reflecting surface. A configuration was adopted in which the

(Problems to be Solved by the Invention) In the above structure in which the lamp is located near the focal point of the reflecting surface of the conventional light projecting device, the width of the band-shaped reflecting surface is made wider than the length of the light source, and this The sides in the width direction of the reflective surface hardly contribute to the optical output, and the light distribution lacks the central luminous intensity, and if the central luminous intensity is supplemented, the entire device becomes large.

The present invention was made in view of the above-mentioned problems, and by forming auxiliary reflecting surfaces of rotational quadratic surfaces on both upper and lower sides of a band-shaped quadratic curved surface, the present invention does not increase the size of the instrument (the central luminous intensity can be reduced). The present invention provides a light projecting device that can be enhanced.

[Structure of the invention]

(Means for Solving the Problems) The projector of the present invention includes a reflector and a light source such as a high-intensity discharge lamp disposed in front of the reflector in the width direction of the reflector. The reflector includes a belt-shaped main reflecting surface extending in the vertical direction formed of a quadratic curved surface, and auxiliary reflecting surfaces formed of rotating quadratic curved surfaces continuously on both upper and lower sides of the main reflecting surface. The light source is located near the focal point of the auxiliary reflecting surface.

(Function) In the light projection device of the present invention, the light source is located near the focal point of the auxiliary reflection surface of the reflector, so that the center luminous intensity is increased.

(Embodiment) The configuration of an embodiment of the present invention will be explained with reference to FIGS. 1 to 3 of the drawings.

Reference numeral 1 denotes a box-shaped instrument main body which is formed from an aluminum plate constituting a reflector and has an approximately rectangular front opening, and the inner surface of the main body 1 is formed as a reflective surface. This reflecting surface has a main reflecting surface 2 consisting of a quadratic curved surface, e.g. a paraboloid, extending vertically in a strip shape, and auxiliary reflecting surfaces each consisting of a rotating quadratic curved surface, e.g. a paraboloid of revolution, on both upper and lower sides of the main reflecting surface 2. Reflective surfaces of 3.4° and 5.6° are formed continuously. The focal lengths of the auxiliary reflective surfaces 3, 4, 5.6 are longer than the focal length of the main reflective surface 2. The width of the lower part of the main reflecting surface 2 is substantially narrower than that of the upper part of the main reflecting surface 2, and a plurality of correction unit reflecting surfaces 7.8 projecting in the shape of a mountain are formed at the upper and lower parts of the main reflecting surface 2. A plurality of correction unit reflecting surfaces 9 protruding in the shape of a mountain are also formed on the surface. Furthermore, beads 14 are formed between the main reflecting surface 2 and the auxiliary reflecting surfaces 3, 4, 5, 6, respectively.

Reference numeral 10 denotes a straight tube light source such as a high-intensity discharge lamp, which is attached to a socket 11 provided on one side of the appliance main body 1, and the light source 10 is arranged in front of the main reflective surface 2 with the length direction being the width direction. It is set up. The center of this light source 10 is shifted forward on the optical axis from the focal point position of the main reflective surface 2, and is located near the focal point of each of the auxiliary reflective surfaces 3°4.5.6, for example, at the focal position. There is.

Further, a protrusion 13 extending in the width direction is formed protruding forward at a rear position of the main reflecting surface 2 for the light WA10 so that the reflected light from the main reflecting surface 2 is not re-injected into the light source 10.

Incidentally, the light It! from the focal position of the main reflecting surface 2! The center of the lens 10 is shifted forward to widen the light distribution by 5° to 10°.

Further, a front glass 12 is provided at the opening of the Noh mask of the instrument body 1.

Next, the operation of this embodiment will be explained.

A part of the light output emitted from the light source 10 is reflected by the main reflecting surface 2 of the instrument main body 1, which is a reflector, and the light source 10 is deflected forward from the focal point of the main reflecting surface 2. The light is spread out, the temperature and height are suppressed, and the light reflected by the auxiliary reflective surface 3.4.5°6 is reflected by the light source 1.
0 near the focal point of this auxiliary reflective surface 3.4.5.6, the center luminous intensity is increased.

Next, the vertical light distribution of the light projecting device of this embodiment and the vertical light distribution of the conventional light projecting device without an auxiliary reflective surface will be explained with reference to FIG.

In the projector of this embodiment, the auxiliary reflecting surface is 3°4.5.
6, the center luminous intensity is increased compared to the conventional light projecting bag Lit<8>. In addition, the luminous intensity on the peripheral side of the light distribution is the unit reflection surface 7.8.
Equalized at 9.

In the embodiment described above, the light source 10 is provided in front of the focal point of the main reflecting surface 2. However, the positional relationship between the main reflecting surface 2 and the light source 10 can be modified by shifting the light source 10 as appropriate depending on the desired light distribution.

Note that the main reflecting surface of the reflector is not limited to a paraboloid, but may be formed as an ellipsoid, a hyperboloid, etc., and the auxiliary reflecting surface 3.4.5.6 may be formed as a paraboloid of revolution. The shape is not limited to this, and it may be formed of an ellipsoid of revolution, a hyperboloid of revolution, or the like.

Further, the lamp of the light source 10 is not limited to a straight tube type, but may have an outer tube bulging outward. Further, the lamp may be of a double-ended type.

〔Effect of the invention〕

According to the present invention, the auxiliary reflective surfaces of the rotating quadratic curved surface are formed on both sides of the upper and lower parts of the main reflective surface of the quadratic curved surface, and are located near the focal point of the auxiliary reflective surface. This increases the central luminous intensity, and since these auxiliary reflective surfaces are formed on both sides of the upper and lower parts of the main reflective surface that do not contribute to the light output, the size of the fixture can be limited without increasing the size of the reflector. This makes it possible to obtain an efficient and compact light projecting device.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a light projecting device according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the same, Fig. 3 is a perspective view of the same, and Fig. 4 is a light distribution diagram of the same. It is. 1. The main body of the instrument as a reflector, 2. The main reflecting surface, 3.
4.5.6... Auxiliary reflective surface, 10... Light source. Mushroom illustration 2

Claims (1)

[Claims] (1) A reflector and a light source disposed in front of the reflector in the width direction of the reflector, the reflector having a strip shape extending in the vertical direction and formed of a quadratic curved surface. It consists of a main reflecting surface and auxiliary reflecting surfaces formed by rotational quadratic curved surfaces continuously on both upper and lower sides of the main reflecting surface, and the light source is located near the focal point of the auxiliary reflecting surface. Characteristic floodlighting device.