JP5027898B2 - Lighting fixture - Google Patents

Description

The present invention relates to an illuminating lamp including a vehicular lamp used as a headlamp, an auxiliary headlamp, various signal lamps, or the like provided at the front of an automobile, or a lamp used in a lighting fixture .

Conventionally, such a lamp is configured, for example, as shown in FIG. 12 or 13 (see, for example, Patent Document 1).
That is, in FIG. 12, the lamp 1 includes a light source 2, a projection lens 3 that focuses light from the light source 2, and a light distribution control member 4 disposed in front of the projection lens 3.

The light source 2 is a substantially point light source such as an LED, and emits light over a predetermined angle range with respect to the optical axis perpendicular to the mounting substrate 2a when a driving voltage is applied. It has become.
The projection lens 3 is composed of a convex lens disposed so that the focal point on the light source side is located near the light source 2 and the optical axis thereof coincides with the optical axis of the light source 2.

  Furthermore, the light distribution control member 4 is configured to include a lens cut prism for light distribution diffusion on one surface (in the case, the lower surface on the light source side) of a flat transparent member, for example.

According to the lamp 1 having such a configuration, the light emitted from the light source 2 enters the projection lens 3 and is converged by the refraction action of the projection lens 3, thereby becoming substantially parallel light, and the light distribution control member. 4 is incident.
The light incident on the light distribution control member 4 is appropriately diffused by the light distribution control member 4 to be given a desired light distribution characteristic, and is irradiated forward.

  In FIG. 13, the lamp 5 includes a light source 2, a reflection surface 6 that reflects light from the light source 2 forward, and a projection lens 7 that focuses the light from the reflection surface 6. Yes.

Here, the reflection surface 6 is composed of an elliptical reflection surface, for example, whose first focal point is located in the vicinity of the light source 2 and whose major axis coincides with the optical axis of the light source 2.
The projection lens 7 is composed of an aspherical lens arranged so that the focal point on the light source side is located near the second focal point of the reflecting surface 6 and the optical axis thereof coincides with the optical axis of the light source 2. .

  According to the lamp 5 having such a configuration, the light emitted from the light source 2 is reflected by the reflecting surface 6, enters the projection lens 7, is focused by the projection lens 7, and is distributed based on the aspherical shape. By being light-controlled, it is irradiated forward and constitutes a predetermined light distribution characteristic.

JP 2003-331616 A

  However, the lamps 1 and 5 described above have the following problems. That is, in order to obtain a desired light distribution characteristic, the lamp 1 requires two optical members, the projection lens 3 and the light distribution control member 4, and considering the light transmittance of these optical members, There is a problem that the transmission loss of the optical member increases, the positional accuracy and the inclination accuracy of these optical members are inevitably generated, the dimension in the optical axis direction is large, and the entire optical member becomes heavy. .

  Further, since the lamp 5 uses the reflecting surface 6, light transmission loss can be reduced, but the reflecting surface 6 is disposed on the rear side of the light source 2. There was a problem that the size was large and the whole was heavy.

  Furthermore, since the external appearance of any of the lamps 1 and 5 is a round shape, the external appearance design is uniform and does not change, and it is impossible to exhibit a three-dimensional appearance based on the function. In addition, there was a problem of lack of novelty.

In view of the above, the present invention can be configured with a simple configuration, particularly small in size in the optical axis direction and lightweight as a whole, and exhibits a three-dimensional new appearance based on the function, so that it can be commercialized and novel. The purpose is to provide an illuminating lamp that improves the above.

The purpose is to arrange at least one light source composed of a light emitting element and a focal position on the light source side in the vicinity of the light source, the optical axis of which substantially coincides with the optical axis from the light source, and the focal position. Projection lens which is a convex light distribution control lens whose exit surface is formed in a non-rotationally symmetric aspherical shape so that the exit direction is continuously refracted in a specified direction with respect to the incident angle from And a lamp unit formed by combining a plurality of lamps including:
A housing fixed so that the lamp unit faces a predetermined direction;
A heat sink provided on the outer surface of the housing;
Equipped with a,
The light exiting from the second direction perpendicular to the optical axis and the first direction is more diffuse than the light exiting from the first direction perpendicular to the optical axis. This is achieved by an illuminating lamp characterized by being formed so as to emit light.

According to the said structure, the light radiate | emitted from each light source injects into each corresponding projection lens, and is irradiated toward the front by being converged by the projection lens.

  At that time, light distribution is controlled by refracting light incident on the projection lens from the light source based on the shape of the exit surface of the projection lens so that the output direction is the specified direction with respect to the incident angle. become. An arbitrary light distribution characteristic can be easily realized by the shape of the exit surface of the projection lens.

  In addition, since the projection lens has a light distribution control function, only one optical member through which the light from the light source is transmitted is transmitted, compared with a case where the projection lens and a separate light distribution control member are provided. Loss can be reduced, and the optical axis direction can be reduced in size and weight.

  In addition, since the exit surface of the projection lens is not rotationally symmetric with respect to the optical axis, the shape of the outer edge of the projection lens viewed from the front is not a perfect circle but a non-rotationally symmetric shape. Thus, merchantability and novelty are improved.

  In this way, according to the present invention, since the exit surface of the projection lens has a surface shape having a light distribution control function, a conventional light distribution control member is not required. The transmission loss is reduced, the optical axis direction can be made compact and lightweight as a whole, and the outer edge shape seen from the front of the projection lens is not a perfect circle but an irregular shape such as an elliptical shape. Therefore, it becomes a novel design, and merchantability and novelty will be improved.

It is a schematic sectional drawing which shows the structure of 1st embodiment of the lamp by this invention. It is a schematic perspective view which shows the projection lens in the lamp of FIG. It is a graph which shows the light distribution characteristic by the lamp of FIG. It is the schematic which shows the example of a design of the projection lens in the lamp of FIG. 5A is a graph showing the light distribution characteristic of a normal convex lens, and FIG. 5B is a graph showing the light distribution characteristic of a projection lens in the design example of FIG. It is a schematic sectional drawing which shows the structure of 2nd embodiment of the lamp by this invention. It is a schematic perspective view which shows the reflection member in the lamp of FIG. It is a schematic sectional drawing which shows the structure of 3rd embodiment of the lamp by this invention. It is a schematic perspective view which shows the lamp unit in the lamp of FIG. It is a schematic perspective view which shows the housing in the lamp of FIG. It is a graph which shows the light distribution characteristic by the lamp of FIG. It is a schematic sectional drawing which shows the structure of an example of the conventional lamp. It is a schematic sectional drawing which shows the structure of the other example of the conventional lamp.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

FIG. 1 shows the configuration of a first embodiment of a lamp according to the present invention.
In FIG. 1, a lamp 10 includes a bulb 11 as a light source and a projection lens 12 that focuses light from the bulb 11 in front of the bulb 11.

  The bulb 11 is, for example, a bulb such as an incandescent bulb, a halogen bulb, a halogen bulb with an infrared reflecting film, or a discharge lamp such as a metal halide lamp. The bulb 11 is fixed and held by a socket and is supplied with power.

The projection lens 12 is a substantially convex lens disposed on the optical axis extending in front of the bulb 11, and focuses the light from the bulb 11 and irradiates it forward.
Here, the projection lens 12 is arranged so that the focal point F on the bulb 11 side is located in the vicinity of the bulb 11.

Here, as shown in FIG. 2, the projection lens 12 has a front surface 12a as an emission surface formed as a light distribution control lens as follows.
The projection lens 12 has an aspherical exit surface 12a so that the exit direction is continuously refracted in a specified direction with respect to the incident angle of light from the focal position F and emitted.
Thereby, the projection lens 12 has the light distribution characteristic shown in FIG. 3 as a result of the simulation.

  Here, the projection lens 12 is based on a convex lens, and the output angle θ2 is calculated based on the incident angle θ1 (and the rear surface shape and refractive index of the projection lens 12 as a constant) with respect to the incident angle θ1. It has become so.

  For example, the projection lens 12 acts as a convex lens in the first direction x perpendicular to the optical axis and emits parallel light, and in the second direction y perpendicular to the first direction x, FIG. As shown, the incident light is diffused so that, for example, the emission angle θ2 = 0.2θ1 with respect to the incident angle θ1.

As a result, the projection lens 12 has a light distribution characteristic as shown in FIG. 5B as compared with the light distribution characteristic of a normal convex lens (see FIG. 5A). It acts as a so-called horizontal diffusing lens diffused with respect to the direction.
Note that such a projection lens 12 is obtained by determining the position of the exit surface from the exit direction for each minute angle with respect to the incident angle θ1 using, for example, a lens design method disclosed in Japanese Patent Application No. 2002-243421. Can be designed easily.
In this way, the projection lens 12 can have the light distribution characteristics shown in FIG. 3 described above by appropriately determining the surface shape of the front surface 12a.

The lamp 10 according to the present embodiment is configured as described above. When the bulb 11 is supplied with power from the socket and emits light, the light L emitted from the light emission center of the bulb 11 enters the projection lens 12 and is projected. By being focused by the lens 12, it is irradiated forward.
In this case, the lamp may include an LED instead of the bulb 11 as a light source.

In this case, the front surface 12a that is the exit surface of the projection lens 12 is formed in the above-described surface shape, thereby having a light distribution control function. Accordingly, since a conventional light distribution control member is not required, the number of parts can be reduced, and the overall configuration can be reduced in weight. In addition, light from the bulb 11 as a light source transmits only the projection lens 12 and moves forward. By irradiating the light, the transmission loss of light can be reduced.
Furthermore, when the projection lens 12 is viewed from the front, the outer edge shape of the projection lens 12 is not a perfect circle, so that the design is novel.

FIG. 6 shows the configuration of the second embodiment of the lamp according to the present invention.
In FIG. 6, a lamp 20 includes a bulb 21 as a light source, a reflecting member 22 that is disposed so as to surround the bulb 21, and has a reflecting surface 22 a that reflects light from the bulb 21 forward, The projection lens 23 is configured to focus the light from the bulb 21 or the reflection surface 22a in the front.

The said valve | bulb 21 is the same structure as the valve | bulb 11 mentioned above, and while being fixedly hold | maintained with a socket, it supplies electric power.
In this case, the lamp may include an LED instead of the bulb 21 as a light source.

As shown in FIG. 7, the reflection member 22 is made of, for example, plastic, and has a reflection surface 22a that is open on the upper surface. The reflection surface 22a is provided with, for example, a reflection film or a reflection coating. ing.
The reflection surface 22a is provided only in a region in front of the mounting substrate 21a of the bulb 21 so as to reflect the light from the bulb 21, reflect the light forward, and guide it to the projection lens 23. It is formed as a concave ellipsoidal reflecting surface.

Here, the elliptical reflecting surface includes a rotating ellipsoidal surface and a free-form surface based on the ellipsoidal surface.
The reflecting surface 22 a has a first focal point F 1 located in the vicinity of the bulb 21 and a long axis arranged along the optical axis of the bulb 21.

  Further, the upper surface of the reflection member 22 is formed as an attachment surface 22 b for the projection lens 23. As a result, the projection lens 23 is placed on the mounting surface 22b of the reflection member 22 and fixed by screws or the like, so that the projection lens 23 can be accurately and easily positioned with respect to the reflection member 22. become.

The projection lens 23 is a convex lens similar to the projection lens 13 disposed on the optical axis extending in front of the bulb 21, and focuses the light reflected directly from the bulb 21 or on the reflection surface 22a. And irradiate forward.
Here, the projection lens 23 is arranged so that the focal point on the bulb 11 side is positioned near the first focal point F1 of the reflecting surface 22a.

  According to the lamp 20 having such a configuration, when the bulb 21 is supplied with power from the socket and emits light, the light L emitted from the light emission center of the bulb 21 is reflected directly or by the reflecting surface 22 a of the reflecting member 22. Then, the light enters the projection lens 23 and is focused by the projection lens 23 to be irradiated forward.

  In this case, since the front surface, which is the exit surface of the projection lens 23, has a light distribution control function, a conventional light distribution control member is not required, so the number of components is reduced and the overall configuration is lightweight. In addition, light from the bulb 21 serving as a light source can be transmitted only through the projection lens 23 and irradiated forward, so that light transmission loss can be reduced.

Moreover, since the reflecting surface 22a of the reflecting member 22 is disposed only in the front region of the bulb 21, the entire lamp 20 can be configured small in the optical axis direction.
Furthermore, when the projection lens 23 is viewed from the front, the outer edge shape of the projection lens 23 is not a perfect circle, so that a novel design is obtained.

FIG. 8 shows the configuration of the third embodiment of the lamp according to the present invention.
In FIG. 8, the lamp 30 is configured as an illuminating lamp including a plurality of the lamps 10 shown in FIG.
In the lamp 30, as shown in FIG. 9, the lamp 10 is configured as a lamp unit 31 integrated three by three.

Each lamp unit 31 includes three lamps 10 fixedly held in the same direction. In this case, each lamp 10 may include an LED instead of the bulb 11 as a light source.
Here, each lamp 10 is configured to have a light distribution characteristic in a relatively narrow irradiation range.

24 lamp units 31 are provided as a whole, and each lamp unit 31 is divided into 24 pieces by fixing each lamp unit 31 so as to face a predetermined direction with respect to the housing 32. The irradiation range is irradiated with light.
Thereby, the lamp 30 as a whole can have a light distribution characteristic of a relatively wide irradiation range.
Further, as shown in FIG. 10, the housing 32 has a heat sink 32 a for radiating the heat generated in each lamp unit 31 on the outer surface thereof.

According to the lamp 30 having such a configuration, the individual lamps 10 constituting each lamp unit 31 operate in the same manner as in the case of the lamp 10 shown in FIG. 1, and emit light over a wide irradiation range as a whole. By irradiating and appropriately selecting the surface shape of the front surface 12a of the projection lens 12 of each lamp 10, as a result of simulation, uniform light distribution characteristics can be obtained as a whole as shown in FIG.
Furthermore, even when a light source with a relatively small amount of light, such as an LED, is used, the lamp unit 31 is configured by combining a plurality of lamps 10 so that a required amount of light can be relatively reduced by so-called multiple light sources. By irradiating a narrow irradiation range, it is possible to realize a desired light distribution characteristic.

Thus, according to the present invention, the front surfaces of the projection lenses 12 and 23 have the light distribution control function, so that a separate light distribution control member is not required.
Therefore, the entire lamp can be configured to be small and light especially in the optical axis direction, and the outer edge shape of the projection lenses 12 and 23 as viewed from the front is changed from a perfect circle to an irregular shape, so that the novel design and the merchantability are achieved. And novelty is improved.
This makes it ideal for various vehicle lamps such as vehicle headlamps, auxiliary headlamps and signal lights, and traffic lamps, traffic signal lights, general illumination lights, work lights, general indicator lights, and general signal lights. A lamp can be provided.

  In the embodiment described above, the rear surfaces of the projection lenses 12 and 23 are formed as flat surfaces. However, the present invention is not limited to this, and the projection lenses 12 and 23 may be formed in a concave shape so as to surround the bulb 11 or the LED as a light source. It is clear.

  As described above, according to the present invention, since the exit surface of the projection lens has light distribution control characteristics, the light incident on the projection lens from the light source or the reflection surface is condensed and the light distribution is controlled. Thus, since a light distribution control member separate from the projection lens is not required, light transmission loss is reduced, and the entire lamp can be configured to be small and light. In addition, since the shape of the outer edge of the projection lens viewed from the front is not a perfect circle but a non-rotationally symmetric shape, a new design is achieved, and the merchantability and novelty are improved. In this way, according to the present invention, it is possible to achieve a simple structure, particularly in a small size and a light weight as a whole with respect to the optical axis direction, and by exhibiting a three-dimensional new appearance based on the function, A lamp designed to improve novelty can be provided.

10, 20, 30 Lamp 11, 21 Bulb (light source)
12, 23 Projection lens 12a Front surface (outgoing surface)
22 Reflecting member 22a Reflecting surface 22b Mounting surface 31 Lamp unit 32 Housing 32a Heat sink

Claims (1)

At least one light source composed of a light emitting element and a focal position on the light source side are located in the vicinity of the light source, and are arranged so that the optical axis substantially coincides with the optical axis from the light source, and the incident angle from the focal position A projection lens, which is a convex light distribution control lens having a non-rotationally symmetric aspherical surface so that the emission direction is continuously refracted in the designated direction. A lamp unit composed of a combination of multiple lamps
A housing fixed so that the lamp unit faces a predetermined direction;
A heat sink provided on the outer surface of the housing;
Equipped with a,
The light exiting from the second direction perpendicular to the optical axis and the first direction is more diffuse than the light exiting from the first direction perpendicular to the optical axis. And an illumination lamp characterized by being formed so as to emit light.

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