JP2007095681A - Floodlight system with multiple light sources and multiple light axes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floodlight system with multiple light sources and multiple light axes not only capable of obtaining an illuminance proportional to the increased number of point light sources, but also capable of changing distance to a target of irradiation with simple operation in case of using a plurality of point light sources. <P>SOLUTION: A plurality of floodlighting means are arranged around a central axis 1. Respective floodlighting means are constituted so as to have a first convex lens means 3 having a first light axis parallel with the central axis, a light source means 20 arranged at one side of the first convex lens means 3, and a second convex lens means 4 arranged at the other side of the first convex lens means 3. A second light axis 41 of the second convex lens means 4 is parallel with the first light axis 31. By arranging the second light axis 41 at more central axis 1 side than the first light axis 31, the light from the light source means 20 is made to refract so as to get lopsided toward the central axis 1 side by the first and second convex lens means 3, 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multi-light source / multi-optical axis projection system, and more particularly to a system for condensing light from a large number of light sources using a plurality of lens means having different optical axes.

  In general, in a point light source such as a light emitting diode, when projecting light in a specific direction, a reflecting surface formed in a parabolic shape employed in, for example, a flashlight is provided.

  For example, Patent Document 1 discloses a beam light shown in FIG. In this beam light, a concave portion 53 is formed substantially at the center of the light control element 52, and a point light source 51 is disposed there. The forward light radiated forward from the point light source 51 is bent by the convex lens 54 and becomes parallel light. Further, the side light emitted from the point light source 51 to the side surface is reflected by the reflecting surface 55 provided on the outer periphery and travels forward. Therefore, the light emitted from the point light source 51 is projected in substantially the same direction.

JP 2003-263907 A

  However, in the configuration described in Patent Document 1, it is necessary to arrange the point light source 51 at the focal position of the convex lens 54 in order to refract the front light so as to be parallel light. Further, in order to reflect the side light so as to be parallel light, the point light source 51 needs to be arranged at the focal point / center position of the reflection surface 55. That is, a sufficient effect cannot be obtained unless the focal positions of the convex lens 54 and the reflecting surface 55 are matched and a point light source is arranged at that position.

  When sufficient brightness cannot be obtained with only the point light source 51, another light source may be added. However, since the newly added point light source cannot be arranged at the focal position, the cost is reduced. You can't expect a matching effect.

  Even if a plurality of beam lights are prepared and irradiated in the same direction, the illuminance obtained per unit area on the irradiated surface is the same.

  Furthermore, if the irradiation direction of multiple beam lights is adjusted and the same irradiation surface is overlapped, the illuminance per unit area can be increased by the number of beam lights, but the distance between the irradiation surface and the beam light. Further, it is necessary to finely adjust the arrangement position and angle of each beam light, and the adjustment work is complicated.

  As described above, in the conventional apparatus and possible modifications, the light emitted from the point light source can be parallel light. However, when the brightness is improved by using a plurality of point light sources, the cost is low. Therefore, there are problems such as troublesome adjustment work.

  Therefore, in view of the above problems, the present invention can not only obtain illuminance according to the increased number of point light sources, but also a distance from the irradiation target with a simple operation if a plurality of point light sources are used. It is an object of the present invention to provide a multi-light source / multi-optical axis projection system capable of changing the light source.

As a means for solving the above problems, the present invention provides:
A multi-light source multi-optical axis light projecting system in which a plurality of light projecting means are provided around a central axis,
Each of the light projecting means
First convex lens means having a first optical axis parallel to the central axis;
Light source means disposed on one side of the first convex lens means;
Second convex lens means disposed on the remaining one side of the first convex lens means;
Have
The second optical axis of the second convex lens means is parallel to the first optical axis and disposed closer to the central axis side than the first optical axis, so that the light source means The light is refracted by the first and second convex lens means so as to be deflected toward the central axis.

  Each of the light projecting means may be configured to satisfy the following formula.

ａ：光源手段と第１の凸レンズ手段の中心との距離
ｆ１：第１の凸レンズ手段が有する第１の焦点距離
ｄｚ：第１の凸レンズ手段の中心と第２の凸レンズ手段の中心との距離
ｆ２：第２の凸レンズ手段が有する第２の焦点距離

a: Distance between the light source means and the center of the first convex lens means f1: First focal length of the first convex lens means dz: Distance between the center of the first convex lens means and the center of the second convex lens means f2 : The second focal length of the second convex lens means

  In each of the light projecting means, it is preferable that the light source means is disposed on the first optical axis.

  A light emitting diode can be used as the light source means.

  Preferably, the first convex lens means and the second convex lens means are each constituted by a lens set composed of a plurality of lenses.

  Preferably, the first convex lens means further includes a hemispherical lens that covers the light emitting diode from the front of the first optical axis to at least the periphery thereof.

  The distance between the first optical axis and the second optical axis is preferably 1 to 6 mm.

  It is preferable to provide a stop between the first convex lens means and the second convex lens means.

  Each of the light projecting means is preferably provided at a line-symmetrical position around the central axis.

  According to the present invention, since the light from the light source means can be condensed on the central axis side by the first and second convex lens means, it is possible to obtain the illuminance doubled according to the number of the light projecting means. .

  The light refraction angle by the first and second convex lens means is determined by the positional relationship between the first and second convex lens means and the light source means. For this reason, if the light projecting means having the same configuration is provided around the central axis so that the positional relationship can be adjusted collectively, the condensing position of the light output from each light source and the distance between the light sources can be easily set. Can be changed.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  FIG. 1 shows a schematic diagram of a multiple light source multiple optical axis projection system. In this multi-light source / multi-optical axis light projecting system, light projecting means including a light source means 20, a first convex lens means 3, and a second convex lens means 4 are arranged on both sides of the central axis 1, respectively. However, in the present invention, the purpose is to double the illuminance by irradiating the same target with the light output from the light projecting means, so there is no meaning unless two or more light projecting means are installed. There is no particular limitation on the upper limit. Further, it is preferable that the light projecting means are arranged symmetrically about the central axis 1.

  In FIG. 1, the two light projecting units are arranged so as to be line symmetric about the central axis 1. For this reason, in the following description, only the structure of the light projecting means located on the upper side in the drawing will be referred to.

  The light projecting means includes a light source means 20, a first convex lens means 3, a diaphragm 6, and a second convex lens means 4 arranged in order from the left side to the right side in FIG. The light passes through the first and second convex lens means 3 and 4 and is projected to the right side of the second convex lens means 4.

  The light source means 20 is not particularly limited as long as it is a point light source. However, it is preferable to use a light emitting diode as a light source and arrange it on the first optical axis 31 of the first convex lens means 3. The light emitting diode is covered with a hemispherical lens 32 on the front side. The hemispherical lens 32 normally constitutes a part of the light emitting diode module, but in the present invention, it constitutes a part of the first convex lens means 3 for condensing the light emitted from the light emitting diode.

  The first convex lens means 3 includes a hemispherical lens 32 and two convex lenses 33 and 34 arranged in order from the left side to the right side in FIG. The hemispherical lens 32 is formed so as to cover the front side of the first optical axis 31 with the light emitting diode. Further, the second convex lens means 4 is composed of two convex lenses 32 and 33 arranged in order from the left side to the right side in FIG. There are no particular restrictions on the size, shape, configuration, etc. of the lenses of the first and second convex lens means 3, 4, and each lens may be composed of a single convex lens, or from a plurality of lenses as shown in the figure. You may comprise with the lens group which becomes. In the following description, the first and second convex lens means 3 and 4 are considered as a single body having a single optical axis, center, and focal length, respectively, and the detailed configuration thereof is a known technique according to the desired size and focal length. The design can be changed freely according to

  The diaphragm 6 is provided to adjust the diameter (range) of light traveling from the first convex lens means 3 to the second convex lens means 4.

  In order to refract the light output from the light source means 20 toward the central axis and reduce the size of the entire system, the light source means 20 and the first and second convex lens means 3 and 4 are arranged as shown in FIG. To do.

  That is, in the first and second convex lens means 3 and 4, the first and second optical axes 31 and 41, which are the respective optical axes, are parallel to the central axis 1 and the second optical axis 41 is the first optical axis. It arrange | positions so that it may approach the center axis | shaft 1 side rather than the optical axis 31. FIG. Furthermore, it arrange | positions so that the following (Formula 3) may be satisfied. In the following description, the interval between the two optical axes 31 and 41 is dy. In this case, dy is preferably set to 1 to 6 mm.

ａ：光源手段と第１の凸レンズ手段の中心との距離
ｆ１：第１の凸レンズ手段が有する第１の焦点距離
ｄｚ：第１の凸レンズ手段の中心と第２の凸レンズ手段の中心との距離
ｆ２：第２の凸レンズ手段が有する第２の焦点距離

a: Distance between the light source means and the center of the first convex lens means f1: First focal length of the first convex lens means dz: Distance between the center of the first convex lens means and the center of the second convex lens means f2 : The second focal length of the second convex lens means

  Equation (1) in (Expression 3) indicates that the distance a between the light source means 20 and the center of the first convex lens means 3 is set to be shorter than the first focal length of the first convex lens means 3. means. Therefore, for the second convex lens means 4 arranged on the right side of the first convex lens means 3, the light source means 20 is to the left of its original position, that is, the positive of the light source means 20 generated by the first convex lens means 3. This is equivalent to being arranged at the position of the standing virtual image 21.

  In FIG. 1, the distance between the erecting virtual image 21 and the first convex lens means 3 is represented by b, but according to the imaging formula, the distance between the normal erecting virtual image 21 and the first convex lens means 3 is (Expression 4). ).

ところで、（数４）は、（数３）の（１）式が前提となる。このため、（数４）の値がマイナスであれば、像は虚像であることを意味する。但し、ｂは距離であるため、マイナスになることはありえないので、マイナスを乗算することにより、（数５）としている。

By the way, (Equation 4) is based on Equation (1) of (Equation 3). For this reason, if the value of (Equation 4) is negative, it means that the image is a virtual image. However, since b is a distance, it cannot be negative. Therefore, (Expression 5) is obtained by multiplying by negative.

  The first convex lens means 3 reduces the distance between the light source means 20 and the second convex lens means 4 without affecting the operation of the second convex lens means 4, thereby reducing the size of the entire system of the present invention. .

  Further, the expression (2) in the above (Equation 3) is equivalent to f2 <b + dz <2f2. That is, the distance b + dz between the erecting virtual image 21 and the center of the second convex lens means 4 is set longer than the focal length f2 of the second convex lens means 4 and shorter than twice f2. To do. By setting b + dz longer than f2, the inverted real image 22 of the erecting virtual image 21 on the right side of the second convex lens means 4 and the inverted real image of the distance dy between the erecting virtual image 21 and the second convex lens means 4 are provided. 23 is formed. Then, by setting b + dz to be shorter than twice f2, the formed inverted real images 22, 23 can be made larger than the upright virtual images 21 and dy. Therefore, since the enlarged dy real image 23 is interposed between the real image 22 of the erect virtual image 21 and the second optical axis 41, the real image 22 of the erect virtual image 21 is separated from the second optical axis 41. Since it is formed in the vicinity of the central axis 1 so as to be far away downward, the light output from the light source means 20 is refracted so as to be inclined obliquely toward the central axis.

  As shown in FIG. 3, when the light projecting means provided on the upper and lower sides of the central axis 1 are simultaneously operated and projecting light onto the light valve, the light projecting direction and the irradiation range are viewed. Since the light means refracts the light downward and the lower light projecting means refracts the light upward, both lights are focused on the central axis, and twice the illuminance can be obtained at the light collecting portion.

  As shown in FIG. 4, when the second convex lens means 4 is moved to the right and dz is increased, the distance b + dz between the erecting virtual image 21 and the second convex lens means 4 is also increased. The distance between the position 23 and the second convex lens means 4 decreases. That is, the degree of inclination of the light output from the light source means 20 toward the central axis increases. At this time, both lights are similarly focused on the central axis 1, but if the light collecting position in FIG. 4 is compared with the light collecting position in FIG. However, it is closer than the condensing position of FIG.

  This means that if the distance dz between the first and second convex lens means 3 and 4 is adjusted, the position where the light output from each light projecting means is condensed and the distance of the light source means 20 can be freely changed. means. Then, as shown in FIG. 1, if the second convex lens means 4 of each light projecting means positioned above and below the central axis is integrally formed and dz can be freely adjusted, each light source means It is possible to adjust the refraction angle of the output light according to the distance of the target point to be irradiated and perform concentrated irradiation.

  The multi-light source / multi-optical axis projection system according to the present invention can be used as light source means for bicycle headlamps, flashlights, spotlights, downlights, projectors and the like.

The schematic diagram which shows the multiple light source multiple optical axis light projection system of this invention. Explanatory drawing which shows the principle of this invention. The figure which shows the irradiation state when the multiple light source multiple optical axis light projection system of this invention projects on a light valve. The figure which shows the irradiation state when the multiple light source multiple optical axis light projection system of this invention projects on a light valve. The figure which shows the conventional beam light apparatus for point light sources.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Center axis 20 ... Light source means 21 ... Erect virtual image 22 ... Inverted real image 23 of light source ... Inverted real image 3 of dy ... 1st convex lens means 31 ... 1st optical axis 32 ... Hemispherical lens 33, 34 ... Convex lens 4 ... second convex lens means 41 ... second optical axes 42, 43 ... convex lens 5 ... light valve 6 ... aperture

Claims (9)

A multi-light source multi-optical axis light projecting system in which a plurality of light projecting means are provided around a central axis,
Each of the light projecting means
First convex lens means having a first optical axis parallel to the central axis;
Light source means disposed on one side of the first convex lens means;
Second convex lens means disposed on the remaining one side of the first convex lens means;
Have
The second optical axis of the second convex lens means is parallel to the first optical axis and disposed closer to the central axis side than the first optical axis, so that the light source means A multi-light source / multi-optical axis light projecting system characterized in that light is refracted by the first and second convex lens means so as to be deflected toward the central axis. 2. The multi-light source / multi-optical axis light projecting system according to claim 1, wherein each of the light projecting units satisfies the following expression.

a: Distance between the light source means and the center of the first convex lens means f1: First focal length of the first convex lens means dz: Distance between the center of the first convex lens means and the center of the second convex lens means f2 : The second focal length of the second convex lens means   The multi-light source / multi-optical axis light projecting system according to claim 1, wherein the light source means is disposed on the first optical axis.   The said light source means is a light emitting diode, The multi-light source multi-optical axis light projection system of Claim 3 characterized by the above-mentioned.   5. The multi-light source multi-optical axis projection system according to claim 4, wherein each of the first convex lens unit and the second convex lens unit is configured by a lens set including a plurality of lenses.   6. The multi-light source multi-optical axis projection according to claim 5, wherein the first convex lens means further comprises a hemispherical lens that covers the light emitting diode from the front of the first optical axis to at least the periphery thereof. Light system.   The multi-light source / multi-optical axis projection system according to claim 3, wherein a distance between the first optical axis and the second optical axis is 1 to 6 mm.   3. A multi-light source multi-optical axis light projecting system according to claim 1, wherein a diaphragm is provided between the first convex lens means and the second convex lens means.   3. The multi-light source / multi-axis light projection system according to claim 1, wherein each of the light projecting units is provided at a line-symmetrical position about the central axis.

Images