TWI384178B - Light accumulation device - Google Patents

Description

Light accumulation device

The present invention relates to a light accumulating device that allows light rays emitted from a plurality of light sources to advance together in such a manner that optical axes overlap.

Patent Document 1 discloses a high-light-quantity light source device in which a plurality of LEDs are densely arranged on the same plane, and the light beams emitted from the respective LEDs are advanced in the same direction.

However, if the LEDs are densely arranged, the thermal energy generated by the LEDs may reduce the luminous efficiency, which may cause problems such as malfunctions. Further, in order to obtain a light source having a higher light amount, it is necessary to arrange more LEDs on the surface, so that the radial structure of the light source itself based on the optical axis becomes large. Therefore, such a light source is not suitable for use in a case where a high light amount is required and a radial direction space based on the optical axis is limited.

Further, Patent Document 2 discloses a light accumulating device including: a first LED that emits a first light of a certain wavelength; and a second LED that emits a second light having a wavelength different from that of the first LED, and an optical axis thereof and a light of the first LED The axis is vertical; and a beam splitter disposed at the intersection of the optical axes and inclined for each optical axis. The device transmits the first light emitted from the first LED by the spectroscope and reflects the second light emitted from the second LED, thereby causing the first light and the second light to overlap and advance together to produce a high The amount of light.

However, in order to efficiently transmit or reflect light by means of a beam splitter, it is necessary to emit light of a suitable wavelength into the transmission surface and the reflection surface of the beam splitter. Therefore, it is necessary to prepare a plurality of types of LEDs to respectively emit light of various wavelengths. In other words, it is not possible to accumulate light of the same wavelength.

Moreover, even if light of a suitable wavelength is incident on the beam splitter, a considerable portion of the light incident on the transmission surface is reflected, and a considerable portion of the light incident on the reflection surface is transmitted, so that it is difficult to produce high efficiency with high efficiency. The amount of light.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-108544

Patent Document 2: Japanese Laid-Open Patent Publication No. 2006-139044

In view of the above problems, an object of the present invention is to provide a light accumulating device which can appropriately dissipate heat of a light source, and the wavelength of light emitted from the light source is not limited, and the radial structure based on the main optical axis can be simplified. Further, a high amount of light is produced.

That is, the optical accumulating device of the present invention includes: a mirror having a reflecting surface formed on the front surface thereof, and a through hole at the center, the central axis of the through hole overlapping the main optical axis, and the reflecting surface is inclined with respect to the main optical axis; a light source that emits a first light beam having an optical axis overlapping the main optical axis from a back side of the mirror toward a front side; and a second light source that is disposed at a position offset from the main optical axis and that emits a central portion to form a low portion a second light ray having a high light amount region is formed in the light amount region and the peripheral portion; the low light amount region of the second light ray enters the through hole, and the high light amount region is incident on the reflective surface, and the second light ray reflected by the reflective surface is incident on the optical axis The manner in which the main optical axes overlap is advanced along with the first light.

According to the device, the first light beam that overlaps the optical axis with the main optical axis passes through the through hole in the center of the mirror, and proceeds from the back side of the mirror to the front side, and the second light emitted by the second light source is The light is reflected by the reflecting surface, and the optical axis is advanced along with the first optical ray so as to overlap the first optical ray, so that the first ray and the second ray can be concentrated, and a high amount of light can be produced.

Further, in addition to the first light source that is provided with the first light that can emit the optical axis and the main optical axis, the second light source that emits the second light is disposed at a position deviated from the main optical axis. The positions are far apart from each other, and the heat generated by the light source is more likely to diverge. Therefore, it is possible to prevent the heat generated by the light source from lowering the luminous efficiency and prevent problems such as malfunctions from occurring.

Further, since it is not necessary to arrange the plurality of light sources side by side on the same plane in order to create a light having a high light amount to collect the light emission directions, the radial structure based on the main optical axis can be simplified.

Further, since the first light passes through the through hole in the center of the mirror and advances from the back side of the mirror along the front side of the main light axis, the second light is reflected by the mirror, so that the first light source and the second light source are emitted. The wavelength of the light is not limited, and the first light source and the second light source can use light of the same wavelength. Therefore, cost reduction can be achieved by using the same kind of light source.

Further, since the first light passes through the through hole of the mirror, the low light amount region of the second light passes through the through hole of the mirror, and the high light amount region is incident on the reflective surface, so that the amount of light of the first light and the second light is hardly Loss can be concentrated in efficient light.

When the first light source includes the first light-emitting element and the first optical element that converges the light flux of the first light ray emitted by the first light-emitting element to the through-hole size, the first light emitted by the first light source is not It will be covered by the mirror and will pass from the back side to the front side for more efficient concentration of light.

When the second light source includes the second light-emitting element and the second light ray emitted from the second light-emitting element forms the second optical element in the low light amount region and the high light amount region, the second light ray can be refracted into Low light amount area and high light quantity area.

A specific embodiment of the second optical element is, for example, a convex lens having a concave portion at the center. According to these members, the light incident on the central portion of the convex lens is refracted and deflected to the peripheral portion, so that a low light amount region can be formed at the center portion and a high light amount region can be formed at the peripheral portion.

The second light ray can be refracted into a low light amount region and a high light amount region as long as the directional characteristic of the second light emitting element is a low light amount at the center portion and a high light amount at the peripheral portion.

As long as the total amount of light of the second light is concentrated in the high light amount region, the first light and the second light can be concentrated without wasting the amount of light of the second light.

If a light having a higher amount of light is to be produced, a plurality of the mirrors may be disposed along the main optical axis, and a light source for emitting light to the reflecting surface is disposed corresponding to each of the mirrors, and the light forms a low-light amount region at the center portion, and is surrounded by The high light amount region is formed in the portion, the low light amount region is incident on the through hole, and the high light amount region is incident on the reflecting surface, and the light beam reflected by the reflecting surface has an optical axis overlapping the main optical axis and proceeds together with the first light.

The first light-emitting element or the second light-emitting element may be, for example, an LED, as a specific embodiment of the first light source and the second light source.

When the optical accumulating device is regarded as one unit and a plurality of units are arranged side by side on the same plane to constitute an illuminating device, since the radial structure based on the main optical axis in one unit is more simplified, the illuminating device can be produced. In addition to the high amount of light, the radial configuration based on the main optical axis can be reduced.

The light accumulating device of the present invention can obtain a high light amount if it is used for a headlight, and can prevent problems caused by heat generation. Further, since the optical accumulating device of the present invention has a more simplified radial structure based on the main optical axis, it is suitable for a headlight whose radial space is limited based on the optical axis.

According to the light accumulating device of such a configuration, since the light beams emitted from the plurality of light sources are advanced together so that the optical axes overlap, it is possible to produce light of a high light amount. Further, since the first light passes through the through hole, the low light amount region of the second light beam enters the through hole, and the high light amount region is incident on the reflection surface, so that most of the light is reflected, so that the light can be concentrated with high efficiency. Further, since the first light source and the second light source are disposed separately, it is possible to prevent a problem caused by heat generation of the light source. Further, since it is not necessary to arrange the plurality of light sources side by side in the same plane so as to align the light emission directions, the radial structure based on the main optical axis can be simplified.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The light accumulating device 100 of the present embodiment can be used as a light source for an automobile headlight.

Specifically, as shown in FIG. 1, the optical accumulating device 100 of the present embodiment includes a first reflecting mirror M1 whose front reflecting surface M12 is inclined with respect to the main optical axis L, and is provided with a central axis and main light. a through hole M11 in which the axis L overlaps; a first light source 1 that emits a first light that overlaps the optical axis L1 and the main optical axis L from the back side of the first mirror M1 toward the front side; and a second light source 2 that is disposed At a position deviated from the main optical axis L, the second light of the vertical main optical axis L can be emitted toward the reflection surface M12 of the mirror M1. Then, the second light ray reflected by the reflecting surface M12 advances together with the first light ray so that the optical axis L2 overlaps the main optical axis L.

The mirror M1 has a circular thin plate shape, and has an elliptical through hole M11 at the center thereof. Further, the angle of inclination of the reflecting surface M12 of the mirror M1 and the main optical axis L is an acute angle of 45 degrees.

The first light source 1 includes a first LED 11 that is a first light-emitting element, and a first optical element 12 that focuses and focuses the light beam of the first light beam emitted from the first LED 11 into the size of the through hole M11.

The first optical element 12 includes a first LED lens 121 that concentrates light emitted from the first LED 11 to reduce the size of the light beam, and a first plano-convex lens 122 that is disposed at a distance from the light emitting end of the first LED lens 121. As shown in FIG. 2, the first light ray concentrated by the first LED lens 121 is made to pass through the through hole M11.

The second light source 2 includes a second LED 21 that is a second light-emitting element, and a second optical element 22 that forms a low-light amount region Lo at a central portion of the second light beam emitted from the second LED 21, and forms a high-light amount in the peripheral portion. Area Hi. Further, the second LED 21 and the first LED 11 are the same type of LED, and can emit light of the same wavelength.

The second optical element 22 includes a second LED lens 221 that converts the second light emitted from the second LED 21 into parallel light, and a second lenticular lens 222 that is disposed at a distance from the light emitting end of the second LED lens 221 The location. As shown in FIG. 2, by adjusting the focus of the second lenticular lens 222 by offset, a low light amount region Lo is formed in the central portion of the second light ray, and a high light amount region Hi is formed in the peripheral portion to make the low light amount region Lo The light is incident on the through hole M11, and the high light amount region Hi is incident on the reflection surface M12. In the case where the light of the high light amount region Hi occupies most of the light amount of the second light is reflected by the reflection surface M12, the optical axis L2 is advanced along with the first light ray so as to overlap the main optical axis L.

According to the optical accumulating device 100 of the present embodiment, the first light ray is emitted so that the optical axis L1 overlaps the main optical axis L, and passes through the through hole M11 of the first mirror M1, and the second light is transmitted. After being reflected by the reflecting surface M12, the optical axis L2 overlaps with the main optical axis L and advances together with the first light, so that the first light and the second light can be concentrated to form a high-light amount of light.

Further, since the first optical element 12 reduces the beam size of the first light beam to the size of the through hole M11 so as to pass through the through hole M11, substantially all of the light can pass therethrough. Since the light of the second light ray is reflected by the reflection surface M12 in the high light amount region Hi, only a small portion of the light contained in the low light amount region Lo is lost, and proceeds with the first light ray. Therefore, almost all of the light emitted from the first LED 11 and the second LED 21 can be concentrated, and light of a high light amount can be formed with high efficiency.

Further, since only the first light passes through the through hole M11 and the second light is reflected by the reflecting surface M12, the wavelengths used for the first light and the second light are not limited. Therefore, the same kind of light source can be used to reduce the cost.

Further, since the first light source 1 is disposed such that its optical axis overlaps with the main optical axis L, the second light source 2 is disposed so as to be offset from the main optical axis L and to emit the second light perpendicular to the main optical axis L. Therefore, the first LED 11 is disposed. The second LED 21 is disposed to be isolated from each other, and heat dissipation is relatively easy. Therefore, it is possible to prevent the first LED 11 and the second LED 21 from having problems such as a decrease in luminous efficiency or a malfunction due to the heat that is dissipated.

Further, since it is not necessary to arrange the first light source 1 and the second light source 2 on the same surface in order to produce light of a high light amount, the light emission directions are aligned, so that the radial structure based on the main optical axis L can be simplified. . Therefore, it can be applied to a headlight, which can not only obtain a high amount of light, but also reduce the radial space based on the optical axis.

Next, it will be described in other embodiments of the present invention. In the following description, members corresponding to the above-described embodiments are denoted by the same reference numerals.

As shown in FIG. 3, the light accumulating device of the above-described embodiment may be used as one light source, and a light accumulating device 100 that concentrates other light sources may be additionally provided. Specifically, the optical accumulating device 100 includes a second mirror M2 that is inclined with respect to the main optical axis L, and has a through hole M21 at the center portion, and a light collecting element C that concentrates the first light and the second light. The third light source 3 is disposed at a position deviated from the main optical axis L, and the third light is incident on the reflection surface M22 of the second mirror M2.

The second mirror M2 is formed in a circular thin plate shape, and the reflecting surface M22 is inclined, and is acutely angled by 45 degrees with respect to the main optical axis L, and the central axis of the through hole M21 at the center portion overlaps with the main optical axis L. The second mirror M2 has a larger diameter than the first mirror M1.

The light collecting element C is composed of two plano-convex lenses C1 and C2, and the concentrated first light and second light are converted into parallel light to concentrate the beam size and the through hole M21 of the second mirror M2. The same size. Therefore, all of the first light and the second light can pass through the through hole M21 of the second mirror M2.

The third light source 3 is disposed such that the optical axis L3 of the third light ray is perpendicular to the main optical axis L at the time of emission. The third light source 3 includes a third LED 31 and a third optical element 32 that forms a low light amount region Lo in the center portion of the third light beam emitted from the third LED 31, and forms a high light amount region Hi in the peripheral portion.

The third optical element 32 includes a third LED lens 321 that causes the third light emitted from the third LED 31 to become parallel light, and a third lenticular lens 322 that is spaced apart from the light emitting end of the third LED lens 321 by a certain distance. And a concave lens 323 disposed between the third lenticular lens 322 and the second mirror M2. The focus of the third lenticular lens 322 and the concave lens 323 is shifted to adjust the low light amount region Lo in the central portion of the third light ray, and the high light amount region Hi is formed in the peripheral portion, and the low light amount region Lo is incident on the through hole M21. And the state in which the high light amount region Hi is irradiated onto the reflection surface M22.

According to these devices, the third light ray is superimposed on the first light ray and the second light ray which are superimposed on the optical axis L1 and L2, and the third light ray is overlapped with the main optical axis L by the optical axis L3. Moving forward, it is possible to produce light with a higher amount of light.

Further, since the light source is added along the main optical axis L, it is possible to produce light of a higher amount of light when the radial structure based on the main optical axis L is kept compact.

Further, the present invention is not limited to the above embodiment.

For example, the light accumulating device can be regarded as a unit, and then a plurality of cells are arranged side by side on the same plane to make a huge light source that can emit high-intensity light. Since the radial structure based on the main optical axis L per unit is simplified, even if light having a high amount of light is produced side by side, the radial structure based on the main optical axis L of the large light source S can be simplified. .

Further, as shown in FIG. 4, in the second optical element 22, a lenticular lens 222 having a concave portion 2221 at the center portion may be used. With these members, the light incident on the central portion of the lenticular lens 222 is refracted toward the peripheral portion, and the low light amount region Lo can be formed at the center portion, and the high light amount region Hi can be formed at the peripheral portion. In addition, the LED that emits light may be a surface light source or a point light source.

The second light ray forms a low light amount region in the center portion, and a high light amount region is formed in the peripheral portion. However, the light distribution characteristic of the second LED 21 can be used to form a low light amount in the center portion and a high light amount in the peripheral portion.

In the low light amount region Lo in the central portion of the second light ray, there is no light amount at all, and all the light is concentrated in the high light amount region Hi of the peripheral portion. In this way, it is possible to concentrate the first light and the second light to form a high light amount of light with the highest efficiency.

If a higher amount of light is to be produced, the fourth light source, the fifth light source, and the Nth light source may be further set in the same manner as the third light source, so that the light emitted by each light source is the optical axis and the main optical axis. The way of overlapping goes forward together.

The second light source or the third light source may be provided to be inclined such that the optical axis direction is inclined with respect to the main optical axis when the light is emitted. In this way, the structure of the photo-accumulating device can be further refined in the radial direction based on the main optical axis.

The mirror is not limited to a circular thin plate shape, and may have a reflecting surface and a through hole. For example, the mirror may have a shape in which the side surface of the cylinder is cut obliquely, and the cut surface has a reflecting surface and has a through hole penetrating from the central portion of the bottom surface toward the center of the cut surface.

Further, the shape of the through hole of the mirror is not limited to an elliptical shape. For example, it may be various shapes such as a rectangle.

Optical elements are not limited to lenses. For example, a diffraction grating may be used to form a light beam of the first light beam into a through hole size, and to refract the second light light into a low light amount region and a high light amount region.

The light-emitting element is not limited to an LED, and may be an organic EL, a xenon lamp, a xenon lamp, a cold cathode tube, or the like.

The light accumulating device can be used as a light source for a projector or the like in addition to a headlight.

Further, in the present specification, the light includes visible light, infrared light, ultraviolet light, electromagnetic waves, and the like.

In addition, some or all of the above-described embodiments or variations of the embodiments may be combined as appropriate, and the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the invention. .

[Industry Utilization]

The present invention concentrates the light emitted from the complex light source on the main optical axis with high efficiency, and can simplify the radial direction structure based on the direction of the main optical axis.

100. . . Light accumulation device

1. . . First light source

2. . . Second light source

3. . . Third light source

M1. . . First mirror

M2. . . Second mirror

M11. . . Through hole

M12. . . Reflective surface

M21. . . Through hole

M22. . . Reflective surface

L1, L2, L3. . . Optical axis

L. . . Main optical axis

11. . . First light-emitting element (first LED)

12. . . First optical element

121. . . 1st LED lens

122. . . 1st plano-convex lens

twenty one. . . Second light-emitting element (second LED)

twenty two. . . Second optical element

221. . . 2nd LED lens

222. . . 2nd lenticular lens

2221. . . Concave

31. . . 3rd LED

32. . . Third optical element

321. . . 3rd LED lens

322. . . 3rd lenticular lens

323. . . concave lens

C. . . Light collecting element

C1, C2. . . Plano-convex lens

Hi. . . High light area

Lo. . . Low light area

Fig. 1 is a schematic view showing a photo accumulating device of the embodiment.

Fig. 2 is a schematic view showing a light beam of light emitted from each light source in the same embodiment.

Figure 3 is a schematic illustration of a light accumulating device of another embodiment.

Fig. 4 is a schematic view showing a second light source according to still another embodiment.

100. . . Light accumulation device

1. . . First light source

2. . . Second light source

M1. . . First mirror

M11. . . Through hole

M12. . . Reflective surface

L1, L2. . . Optical axis

L. . . Main optical axis

11. . . First light-emitting element (first LED)

12. . . First optical element

121. . . 1st LED lens

122. . . 1st plano-convex lens

twenty one. . . Second light-emitting element (second LED)

twenty two. . . Second optical element

221. . . 2nd LED lens

222. . . 2nd lenticular lens

Claims (12)

A light accumulating device, comprising: a mirror having a reflecting surface formed on a front surface thereof, wherein a center of the reflecting surface is provided with a through hole, wherein a central axis of the through hole overlaps with a main optical axis and the reflection is inclined to face the main optical axis The first light source emits a first light beam whose optical axis overlaps the main optical axis from the back side of the mirror to the front side, and the second light source is disposed at a position deviated from the main optical axis and emits a central portion. a low light amount region and a peripheral portion forming a second light ray in a high light amount region, wherein in the second light ray, light in a low light amount region is incident on the through hole, and light having a high light amount region is irradiated onto the reflective surface, and the reflective surface is The reflected second light beam advances along with the first light beam so that the optical axis overlaps the main optical axis; the second mirror has a reflective surface formed on the front surface, and a through hole is formed in the center of the reflective surface, and the reflective surface is opposite to the main surface The optical axis is obliquely disposed, and the first light and the second light that are emitted from the back side toward the front side penetrate the through hole; and the convex flat lens overlaps the optical axis with the main optical axis. Way forward together The first light ray and the second light ray are concentrated; the plano-convex lens causes the light concentrated by the convex flat lens to become a parallel light beam to pass through the through hole of the second mirror; and the third light source is disposed Positioning the third light ray on the reflection surface of the second mirror and reflecting it by the reflection surface at a position deviating from the main optical axis, and aligning the first ray with the optical axis overlapping the main optical axis The second light advances together. The optical accumulating device according to claim 1, wherein the first light source includes: a first light emitting element; and a first optical element that converges the light beam of the first light emitted from the first light emitting element The size of the through hole. The light accumulating device according to claim 1, wherein the second light source includes: a second light emitting element; and the second optical element, wherein the second light emitted from the second light emitting element forms the low light amount region And the high light amount area. The optical accumulating device according to claim 3, wherein the second optical element is a convex lens having a concave portion at a central portion thereof. The light accumulating device according to claim 3, wherein the light distribution characteristic of the second light-emitting element is such that a low light amount is formed in the center portion and a high light amount is formed in the peripheral portion. The light accumulating device of claim 1, wherein the total amount of light of the second light is in the high light amount region. The light accumulating device of claim 1, wherein a plurality of the mirrors are disposed along the main optical axis, and a light source for emitting light to the reflecting surface is disposed corresponding to each of the mirrors; the light is formed at a central portion. In the light quantity region, a high light amount region is formed in the peripheral portion; the light in the low light amount region is incident on the through hole, and the light in the high light amount region is irradiated onto the reflecting surface; and the light reflected by the reflecting surface is overlapped with the main optical axis by the optical axis. Advance along with the first light. The light accumulating device of claim 2, wherein the first light emitting element is an LED. The optical accumulating device of claim 3, wherein the second illuminating element is an LED. An illuminating device comprising: a first reflecting mirror having a reflecting surface formed on a front surface thereof, wherein a center of the reflecting surface is provided with a through hole, wherein a central axis of the through hole overlaps with a main optical axis and the reflection is inclined to face the main optical axis The first light source emits a first light beam whose optical axis overlaps the main optical axis from the back side of the first mirror toward the front side, and the second light source is disposed at a position deviated from the main optical axis and is emitted. The central portion forms a low light amount region and the peripheral portion forms a second light having a high light amount region, and the second light is formed in the second light The light in the low light amount region is incident on the through hole, and the light in the high light amount region is irradiated onto the reflective surface, and the second light reflected by the reflective surface is accompanied by the first light in such a manner that the optical axis overlaps the main optical axis. Advancing together; N-2 mirrors of the second to N-1 (N-series 3 or more), each having a reflecting surface formed on the front surface, and a through hole at the center of the reflecting surface, wherein each of the reflecting surfaces is opposite to the reflecting surface The main optical axis is disposed obliquely from the front mirror, and the light emitted from the back side toward the front side passes through the through hole; and the N-2 light sources of the third to N are disposed at positions deviated from the main optical axis. The third to N-rays in which the central portion forms a low-light-amount region and the peripheral portion forms a high-luminance region are incident on the second to N-1 mirrors, and a convex flat lens is provided between the adjacent mirrors. The concentrated light is concentrated by the front mirror; and the plano-convex lens causes the concentrated light due to the convex flat lens to become a parallel beam passing through the through hole of the rear mirror. A headlight, characterized in that the light accumulating device of claim 1 is used. The illuminating device of claim 10, wherein the third to Nth light sources respectively comprise: a light emitting element; and a lenticular lens and a concave lens away from the light emitting end of the light emitting element; and the lenticular lens and the concave lens are adjusted, A low light amount region is formed in a central portion of the light emitted from the third to N light sources, and a high light amount region is formed in the peripheral portion. The low light amount region is irradiated to the through hole, and the high light amount region is irradiated to the reflecting surface.