JP5000464B2 - Louver built-in projector - Google Patents

Description

  The present invention relates to a projector with a built-in louver.

  Conventionally, an approximately conical cone-shaped main reflecting mirror is provided, and the light of the lamp inserted in the main reflecting mirror in a substantially concentric state from the bottom opening is reflected by the main reflecting mirror to be substantially parallel light from the projection opening. In addition, there is a louver built-in projector in which an arc-shaped or ring-shaped louver that restricts the diffusion of light from the lamp is provided inside the main reflecting mirror (see Patent Document 1).

The main reflecting mirror illuminates by reflecting the light from the lamp and projecting it as substantially parallel light from the projection opening.
No. 7-51682

  However, the louver restricts the diffusion of the light from the lamp, that is, restricts the light from leaking around the projector, and the reflected light from the louver does not contribute to the illumination, so the illumination efficiency is poor. There was a problem.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a louver built-in projector that improves illumination efficiency.

In order to solve the above-described problems, the present invention provides a main reflector having a substantially conical cone shape, and the light of a lamp inserted in a substantially concentric state from the bottom opening into the main reflector is received by the main reflector. In the projector with a built-in louver, which is reflected and projected as substantially parallel light from the projection opening, and an arc-shaped or ring-shaped louver is provided inside the main reflecting mirror to restrict the diffusion of light from the lamp. The louver is provided closer to the main reflector than the inner diameter of the bottom opening of the reflector, and a part of the lamp light is reflected closer to the lamp than the inner diameter of the bottom opening of the main reflector. A plurality of arcuate or ring-shaped sub-reflecting mirrors capable of projecting as substantially parallel light from the light projecting aperture , and the plurality of louvers are stepped upward with the length of each end on the main reflector side upward that it is formed short so that Jo There is provided a louver built projector characterized.

  According to a second aspect of the present invention, the sub-reflecting mirror is preferably curved in a side view.

  According to the present invention, a louver is provided closer to the main reflector than the inner diameter of the bottom opening of the main reflector, that is, the portion where the main reflector functions, while the inner diameter of the bottom opening of the main reflector is greater. By providing an arc-shaped or ring-shaped sub-reflecting mirror that is close to the lamp, that is, where the main reflecting mirror does not function, can reflect a part of the light from the lamp and project it as substantially parallel light from the projection opening. Since a part of the light of the lamp is reflected by the sub-reflecting mirror and can be projected as substantially parallel light from the projection opening, the illumination efficiency is improved in combination with the main reflecting mirror. In addition, since a sub-reflecting mirror can be provided instead of the louver at the position where the louver is originally provided, the structure is simple and the cost is reduced.

  According to the second aspect, the sub-reflecting mirror has a parabolic antenna shape, the light condensing property is improved, and the illumination efficiency is further improved.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the louver built-in projector 1 is provided with a main cone 2 having a substantially conical cone shape, and a socket cover 3 is coupled to a bottom opening 2 a of the main reflector 2. A bracket 5 for fixing the louver built-in projector 1 to a base 4 such as a pillar is attached to the socket cover 3.

  A socket 7 to which a feeder 6 is connected is housed in the socket cover 3, and the electrode portion of the lamp 8 is screwed into the socket 7 from the light projection opening 2 b side of the main reflecting mirror 2, and the lamp 8 is inserted into the socket 7. By being electrically connected, the lamp 8 is inserted into the main reflecting mirror 2 from the bottom opening 2a in a substantially concentric state.

  Then, the light from the lamp 8 is reflected by the main reflecting mirror 2 and is projected as substantially parallel lights a to c (see FIG. 2) from the projection opening 2b.

  A plurality of (three in this example) arcuate louvers 10a to 10c and the sub-reflecting mirror 11 for restricting the light diffusion of the lamp 8 are supported by the stays 12a to 12c on the upper side inside the main reflecting mirror 2. It is provided concentrically in the state where it is made. Thus, if the louvers 10a to 10c are provided on the upper side inside the main reflecting mirror 2, light damage to surrounding private houses due to the upward leaked light is suppressed.

  The louvers 10a to 10c and the sub-reflecting mirror 11 have an arc shape by setting the opening angle θ1 to 120 degrees, and the opening angle θ1 can be set in the range of 90 to 180 degrees. . The louvers 10a to 10c and the sub-reflecting mirror 11 do not necessarily have an arc shape, and may have a ring shape with an opening angle θ1 set to 360 degrees.

The louvers 10a to 10c are provided so as to be parallel to the substantially parallel lights a to c at a predetermined distance closer to the main reflector side than the inner diameter D of the bottom opening 2a of the main reflector 2. . As is clear from FIG. 2, the plurality of louvers 10 a to 10 c are such that the lengths of the end portions 10 a ′, 10 b ′, and 10 c ′ on the main reflecting mirror 3 side are indicated by the inclined dash-dot line g. It is formed so as to be stepped toward the upper side.

  Further, the sub-reflecting mirror 11 is provided closer to the lamp side than the inner diameter D of the bottom opening 2a of the main reflecting mirror 2 so as to face outward with a predetermined distance from the innermost louver 10c. . The outward angle θ2 is set to about 10 to 20 degrees.

  A part of the light of the lamp 8 is reflected by the sub-reflecting mirror 11 and is projected as substantially parallel light d and e (see FIG. 2) from the light projection opening 2b. Note that the direct light f of the light from the lamp 8 is also projected from the light projection opening 2b.

  The sub-reflecting mirror 11 is linear when viewed from the side, but as shown in FIG. 3, it can be curved into a parabolic antenna when viewed from the side.

  In the louver built-in projector 1 as described above, the louvers 10a to 10c are provided closer to the main reflector side than the inner diameter D of the bottom opening 2a of the main reflector 2, that is, at a site where the main reflector 2 functions. On the other hand, by providing the sub-reflecting mirror 11 closer to the lamp side than the inner diameter D of the bottom opening 2a of the main reflecting mirror 2, that is, the portion where the main reflecting mirror 2 does not function, Can be projected as substantially parallel lights d and e from the projection opening 2b, and the illumination efficiency is improved in combination with the main reflecting mirror 2. That is, the light in the range of θ3 shown in FIG. 2 is not projected as substantially parallel light d and e without the sub-reflecting mirror 11, and is projected as substantially parallel light d and e. As a result, the illumination efficiency is improved.

  In addition, since the sub-reflecting mirror 11 is merely provided instead of the louver at a position where the louver is originally provided (in this example, a position closer to the center than the louver 10c), the cost is reduced.

  Furthermore, if the sub-reflecting mirror 11 is curved in a side view, the sub-reflecting mirror 11 becomes a parabolic antenna, the light condensing performance is improved, and the illumination efficiency is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a louver built-in projector of embodiment of this invention, (a) is a principal part cross-sectional side view, (b) is a front view. It is a principal part cross-sectional side view which shows the direction of the light of the light projector with a built-in louver of embodiment of this invention. It is side surface sectional drawing of the modification of a subreflector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 with built-in louver Main reflector 2a Bottom opening 2b Projection aperture 8 Lamp 10a-10c Louver 11 Subreflector D Inner diameter ae Parallel light

Claims (2)

An approximately conical cone-shaped main reflecting mirror is provided, and the light of the lamp inserted in a substantially concentric state from the bottom opening into the main reflecting mirror is reflected by the main reflecting mirror and is projected as substantially parallel light from the projection opening. In this main reflector , in the louver built-in projector in which a plurality of arc-shaped or ring-shaped louvers concentrically restricting the diffusion of the light of the lamp is provided,
The louver is provided closer to the main reflector than the inner diameter of the bottom opening of the main reflector, and a part of the light of the lamp is placed closer to the lamp than the inner diameter of the bottom opening of the main reflector. An arc-shaped or ring-shaped sub-reflecting mirror that can be reflected and projected as substantially parallel light from the projection opening is provided ,
The plurality of louvers are formed so as to be short so that the length of each end on the main reflector side is stepped upward .   The louver built-in projector according to claim 1, wherein the sub-reflecting mirror is curved in a side view.

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