CN212986806U - Achromatic light-emitting device - Google Patents

Abstract

The utility model discloses an achromatic light-emitting device, which comprises a luminous light source, wherein the light source comprises a luminous zone, and the luminous zone emits light; a converging lens for receiving light, a light emitting region and a converging lensThe distance between the mirrors is L, the light receiving radius of the beam receiving lens is R, the light receiving angle is A,

(ii) a An achromatic lens group is arranged on one side, away from the light source, of the beam-converging lens, the achromatic lens group comprises a first convex lens and a first concave lens close to the first convex lens, and the dispersion coefficient of the first concave lens is smaller than that of the first convex lens; and a collimating lens is arranged on one side of the achromatic lens group far away from the light source. The beam-converging lens converges light, and part of large-angle light in the light is deflected into small-angle light, so that most of light emitted by the light source can be emitted, and the overall brightness of the emitted light is increased; the achromatic lens group performs achromatic treatment on the light passing through the beam-converging lens; the collimating lens adjusts the light angle so that the light emitted from the device is a more collimated parallel light.

Description

Achromatic light-emitting device

Technical Field

The utility model belongs to the technical field of the lighting technology and specifically relates to achromatic light emitting device.

Background

With the development of lighting technology, the lighting technology has become more and more mature. In order to collect and focus light in an illumination device, a convex lens is generally added to an optical path to collect light. Since the convex lens is added, the light emitted from the convex lens may exhibit a dispersion phenomenon. The so-called chromatic dispersion phenomenon is that a beam of white light parallel to the main optical axis is incident on a thin lens made of glass placed in air (n ≈ 1), and due to the scattering of the light, the light of different wavelengths exiting the lens is deflected differently. Refractive index of red light

Refractive index less than violet light

So that the red light corresponds to the focal length of the lens

Greater than the focal length of the lens corresponding to violet light

。

In the fields of flashlights, gun lamps, searchlights, search lights and the like, only light from a light source at a specific angle is needed, and light not within the specific angle is wasted to a great extent, so that the emergent illumination brightness cannot be expected.

Therefore, in order to emit light not within a specific angle, a reflector cup is used to collect light that cannot be emitted and reflect the collected light.

The use of the reflective cup to increase the emergent light essentially increases the utilization rate of light, but the light emitting amount of the light source is constant, that is, the higher the utilization rate of light is, the higher the brightness of the emergent light is, in the case of constant area and the same light emitting amount. However, when the light-reflecting cup is used, the light source for providing illumination needs to be placed at the focus of the light-reflecting cup, otherwise, the light-reflecting cup is out of focus, so that the light from the light source cannot be received to the maximum extent. In addition, the focal points of the reflecting cups are not necessarily the same due to factors such as process errors and the like during the manufacturing of the reflecting cups, so that the positions of the light sources are difficult to coincide with the focal points of the reflecting cups.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the weak point of above-mentioned conventional art, the utility model provides a can high-efficiently utilize the light that the light source sent and carry out achromatic illuminator.

In order to solve the above problems, the utility model adopts the following technical scheme: an achromatic light emitting device comprising a light source for emitting light, said light source including a light emitting region, said light emitting region emitting light, characterized in that: the LED lamp also comprises a beam-converging lens, the beam-converging lens receives light emitted by a light-emitting area, the distance between the light-emitting area and the beam-converging lens is L, the radius of the beam-converging lens is R, the beam-converging angle of the beam-converging lens is A,

(ii) a An achromatic lens group is arranged on one side, away from the light source, of the beam-converging lens, the achromatic lens group comprises a first convex lens and a first concave lens close to the first convex lens, and the dispersion coefficient of the first concave lens is smaller than that of the first convex lens; a collimating lens is arranged on one side of the achromatic lens group away from the light source;

the achromatic lens group is circumferentially provided with a fixing device in a surrounding manner, and the fixing device is connected with the fixing shell in a sliding manner;

be provided with the sliding tray on the lateral wall of set casing, the sliding tray extends to the internal surface of set casing by the surface of set casing, the sliding tray extends along the length direction of set casing, sliding connection has slider in the sliding tray, slider is connected with fixing device.

As an improvement of the technical scheme: the collimating lens covers one end of the fixed shell far away from the light source.

As an improvement of the technical scheme: the fixing device comprises a circular ring arranged around the achromatic lens group, a base is arranged on the circular ring, and the size of the base is smaller than that of the achromatic lens group.

As an improvement of the technical scheme: the bolt comprises an external thread, an internal thread corresponding to the external thread is arranged on the sliding device, the bolt penetrates through the sliding device along the length direction of the fixed shell, the fixed platform is arranged on the side wall of the fixed shell, and the bolt is connected with the fixed platform.

As an improvement of the technical scheme: the light source is an LED chip, and a white fence is arranged around a light emitting area of the LED chip in a winding mode.

As an improvement of the technical scheme: the LED white light source further comprises a diaphragm, wherein the diaphragm comprises a circular diaphragm hole, the diaphragm covers the light emitting area and the white surrounding wall, and the diameter of the diaphragm hole is larger than the side length of the light emitting area and smaller than the length of a diagonal line of the light emitting area.

As an improvement of the technical scheme: the light source is a luminous wavelength conversion device; the laser device also comprises a laser diode, wherein the laser diode emits laser to excite the wavelength conversion device, and the wavelength conversion device is excited to emit excited light.

As an improvement of the technical scheme: the wavelength conversion device comprises a transparent heat conduction substrate, wherein a fluorescent material is arranged on one side, away from the laser diode, of the transparent heat conduction substrate, and a reflection film for transmitting laser reflected received laser is arranged between the transparent heat conduction substrate and the fluorescent material.

Due to the adoption of the technical scheme, compared with the prior art, the technical scheme has the advantages that the light emitted by the light source is converged through the converging lens, so that part of large-angle light in the light emitted by the light source is deflected into small-angle light, most of the light emitted by the light source can be emitted, and the overall brightness of the emergent light is increased; the light collected by the beam-collecting lens is received by the achromatic lens group, and the achromatic lens group performs achromatic processing on the light passing through the beam-collecting lens; the light processed by the achromatic lens group is emitted to the collimating lens, and the collimating lens adjusts the angle of the light again, so that the light emitted from the device is collimated parallel light.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a schematic view of a structure of an achromatic light emitting device.

Fig. 2 is a light path diagram of light emitted from a light source.

Fig. 3 is a partially enlarged view of fig. 1.

Fig. 4 is a top view of the fixture.

Fig. 5 is a top view of a white fence.

Fig. 6 is a top view of the diaphragm.

Fig. 7 is a schematic diagram of another efficient achromatic light emitting device.

Fig. 8 is a schematic view of the structure of the wavelength conversion device.

Detailed Description

Example 1:

the light emitted by the light source is limited, and can be emitted only at a specific angle, so that the waste of light energy is caused, and the overall brightness of the emitted light is not high. And the light tends to exhibit chromatic aberration as it passes through the lens. Therefore, the light emitted by the light source needs to be fully utilized to enhance the overall brightness of the emergent light, and the visual effect of the emergent light can be improved by eliminating the chromatic aberration generated by the light. Therefore, a new solution is proposed herein to improve the utilization of the light emitted by the light source. As shown in fig. 1 to 6, an efficient achromatic light emitting device includes a light source 111 for emitting light, the light source 111 includes a light emitting area 111a, the light emitting area 111a emits light, and further includes a converging lens 112, the converging lens 112 receives the light emitted by the light emitting area 111a, a distance between the light emitting area 111a and the converging lens 112 is L, a converging radius of the converging lens 112 is R, a converging angle of the converging lens 112 is a,

(ii) a An achromatic lens group 113 is arranged on one side of the converging lens 112 far away from the light source 111, the achromatic lens group 113 comprises a first convex lens 113a and a first concave lens 113b close to the first convex lens 113a, and the dispersion coefficient of the first concave lens 113b is smaller than that of the first convex lens 113 a; the side of the achromatic lens group 113 away from the light source 111 is provided with a collimating lens 114. The light emitted from the light emitting region 111a can be divided into a small-angle light 121 that can be emitted and a large-angle light 122 that cannot be emitted, and the large-angle light 122 can be divided into a light beam 122a that can be received by the beam converging lens 112 and a light beam 122b that cannot be received by the beam converging lens 112. The small-angle light 121 can directly exit through the converging lens 112; and after the part of the light 122a in the large-angle light 122 is received by the beam-receiving lens 112, the angle becomes smaller, so that the light 122a can exit and pass through the beam-receiving lens 112 to exit. The converging lens 112 is preferably a convex lens, and it is known from optical knowledge that the convex lens has a characteristic of converging light, that is, can angularly twist the received light. The small-angle light 121 emitted by the light emitting region 111a can directly pass through the converging lens 112, and the light beam 122a in the large-angle light 122 can be emitted from the device only after being received by the converging lens 112 and being twisted into the small-angle light 121, so that the light emitted by the light emitting region 111a can be fully utilized due to the presence of the converging lens 112, and the light energy loss is reduced. The converging lens 112 needs to be very close to the light emitting region 111a to receive more large-angle light 122, but it is known from optical knowledge that the converging ability of the convex lens to the light is limited, and the convex lens has a focus, and when the light emitting point is between the focus and the convex lens, the converging ability of the convex lens to the light is worse when the light emitting point is closer to the convex lens. Therefore, the converging lens 112 and the light emitting region 111a cannot be attached to each other. However, the distance between the light emitting area 111a and the converging lens 112 cannot be too far, and if the distance between the light emitting area 111a and the converging lens 112 is too far, only a small part of light from the light emitting area 111a can be received by the converging lens; however, if both the distance between the light emitting region 111a and the converging lens 112 can receive more light, only the light can be selectively increasedThe size of the beam-converging lens 112 is increased, but this again increases the overall volume of the overall device. In summary, in order to ensure that the converging lens 112 can receive the light from the light emitting region 111a to the maximum, the light emitting region 111a and the converging lens 112 need to be close enough to each other; however, if the distance between the light emitting region 111a and the converging lens 112 is too close, the twisting ability of the converging lens 112 to the light is reduced. Only if the distance between the converging lens 112 and the light emitting region 111a is optimal, the converging lens 112 can effectively twist the angle of the light and receive the light to the maximum extent. The inventor proves the following relationship for many times: assuming that the distance between the light emitting region 111a and the converging lens 112 is L, the radius of the converging lens 112 is R, and the light-converging angle of the converging lens 112 is A, wherein

。

The light-receiving radius of the beam-receiving lens 112 can be obtained, and R is the radius of the actually used beam-receiving lens 112, so that only the requirement of satisfying

At this time, the size of the converging lens 112 and the distance between the converging lens 112 and the light emitting region 111a can be optimally balanced, and the converging lens 112 can receive the light emitted from the light emitting region 111a to the maximum extent while ensuring the twisting capability of the light, thereby ensuring that the light emitted from the light emitting region 111a can be fully used. From optical knowledge, when a beam of light passes through a convex lens, since the convex lens generally consists of two spherical surfaces (or one spherical surface and one flat surface), the refractive index is

The lens is placed in a medium with the refractive index n, and under the condition that the included angle between the light rays emitted by an object point and the main optical axis of the lens is small (generally less than 5 degrees), the focal length formula of the thin lens is f =

Wherein

And

the radii of the two refracting surfaces of the lens being such that light of different wavelengths (light of different colours) has a different

The values thus result in different wavelengths of light having different focal lengths f after passing through the convex lens. The dispersion phenomenon occurs because the focal length f of light of different wavelengths passing through the same lens is different. Therefore, the small-angle light 121 emitted after passing through the converging lens 112 has a chromatic dispersion phenomenon, which greatly affects the visual effect of the emitted light, and thus the chromatic dispersion phenomenon must be eliminated. Therefore, this scheme introduces an achromatic lens group 113 to eliminate the dispersion problem of the small-angle light 121. As can be seen from the optical principle, the smaller the dispersion coefficient, the larger the dispersion. In the present embodiment, the first convex lens 113a plays a role of converging the small-angle light 121, and it can be known from the optical principle that the converging degree of the first convex lens 113a to the blue light is greater than that to the red light; the first concave lens 113b plays a role of diverging the small-angle light 121, and it can be known from optical knowledge that the divergence degree of the first concave lens 113b to the blue light is larger than that to the red light. Since the small-angle light 121 finally emitted by the device needs to be collimated as much as possible, the capability of the first convex lens 113a for converging and folding the small-angle light 121 is greater than the capability of the first concave lens 113b for diverging the small-angle light 121. However, the first concave lens 113b has a different ability to bend light from the first convex lens 113a, causing dispersion. In order to counteract the chromatic dispersion caused by the first convex lens 113a in the process of converging and folding the small-angle light 121, the chromatic dispersion degree of the first concave lens 113b is increased, that is, the chromatic dispersion coefficient of the first concave lens 113b is smaller than that of the first convex lens 113 a. The small-angle light 121 passing through the achromatic lens group 113 still has a part which is divergentFinally, a larger light spot is formed, and the larger the light spot formed by the light is, the lower the light intensity is, as can be seen from the conservation of etendue. A collimator lens 114 is therefore arranged on the side of the achromatic lens group 113 remote from the light source 111, the collimator lens 114 likewise preferably being a convex lens. The small-angle light 121 passing through the achromatic lens group 113 is converged again by the collimating lens 114, so that the still-diffused small-angle light 121 is twisted into relatively collimated emergent light by the converging lens 114, a light spot formed by the emergent light cannot become large, and the light intensity of the emergent light is improved. In this embodiment, the positional relationship between the first convex lens 113a and the first concave lens 113b in the achromatic lens group 113 is adjustable, that is, the first convex lens 113a is disposed on the side of the achromatic lens group 113 close to the collimator lens 114, and the first concave lens 113b is disposed on the side of the achromatic lens group 113 close to the light source 111, or the positional relationship between the first convex lens 113a and the first concave lens 113b may be such that the first convex lens 113a is disposed on the side of the achromatic lens group 113 close to the light source 111, and the first concave lens 113b is disposed on the side of the achromatic lens group 113 close to the collimator lens 114.

In this embodiment, a plurality of lenses are used to assist the light emitted from the light emitting region 111a to exit, but the lenses are generally made of glass and are easily damaged by external force. Therefore, in order to prevent the damage of each lens in the device, it is preferable that the device further includes a fixing housing 101 disposed around the light source 111, the fixing device 102 is disposed around the achromatic lens group 113 in the circumferential direction, the fixing device 102 is slidably connected to the fixing housing 101, and the collimator lens 114 covers an end of the fixing housing 101 away from the light source 111. The fixed shell 101 is selected to be arranged around the light source 111, namely, the light source 111 is arranged at one end of the fixed shell 101, and the beam converging lens 112 and the achromatic lens group 113 are arranged in the fixed shell 101, so that damage to various components in the fixed shell 101 due to external force is avoided. In order to prevent suspended particles in the air from entering the fixed casing 101 to affect the light emission, the collimating lens 114 covers an end of the fixed casing 101 away from the light source 111, so that the collimating lens 114 also has the function of light outlet glass. In order to fix the achromatic lens group 113, a fixing device 102 is disposed around the achromatic lens group 113 in a circumferential direction, and the fixing device 102 slidably couples the achromatic lens group 113 to the fixed case 101. The purpose of the sliding connection is to allow the achromatic lens group 113 to be moved while connected. When the achromatic lens group 113 is moved, particularly, the distance from the light emitting region 111a can be changed, the achromatic lens group 113 can also focus the outgoing light. In order to move the achromatic lens group 113 conveniently, a sliding groove 105 is preferably formed in a side wall of the fixed casing 101, the sliding groove 105 extends from an outer surface of the fixed casing 101 to an inner surface of the fixed casing 101, the sliding groove 105 extends along a length direction of the fixed casing 101, a sliding device 106 is slidably coupled to the sliding groove 105, and the sliding device 106 is coupled to the fixed device 102. In order to adjust the distance between the achromatic lens group 113 and the light emitting region 111a from the outside of the device, a slide groove 105 extending from the outer surface to the inner surface of the fixed housing 101 and extending in the longitudinal direction of the fixed housing 101 is provided on the side wall of the fixed housing 101, and a slide 106 is slidably coupled in the slide groove 105. The sliding connection referred to herein is understood to mean that the sliding device 106 is connected to the sliding groove 105 without hindering the sliding device 106 from moving in the sliding groove 105. The sliding device 106 is connected with the fixing device 102, so that the sliding device 106 can drive the fixing device 102 to move when moving in the sliding groove 105, and indirectly drive the achromatic lens group 113 to move, and the distance between the achromatic lens group 113 and the light source 111 is adjusted, thereby realizing the focusing function of the achromatic lens group 113. However, it is not enough to adjust the distance between the achromatic lens set 113 and the light source 111, and we need to fix the achromatic lens set 113 after adjusting it to a proper position for convenience and practicality. Therefore, preferably, the bolt device further comprises a bolt 107 and a fixed platform 108, wherein the bolt 107 comprises an external thread, an internal thread corresponding to the external thread is arranged on the sliding device 106, the bolt 107 penetrates through the sliding device 106 along the length direction of the fixed shell 101, the fixed platform 108 is arranged on the side wall of the fixed shell 101, and the bolt 107 is connected with the fixed platform 108. The sliding device 106 is provided with internal threads corresponding to the external threads of the bolt 107, so that the sliding device 106 can be driven to move when the bolt 107 is screwed, and the adjustment of the achromatic lens set 113 in the fixed shell 101 is facilitated. In order to avoid the sliding of the bolt 107, a fixing table 108 is provided outside the fixing housing 101, and the bolt 107 is blocked by the fixing table 108, so that the achromatic lens group 113 can be fixed and cannot move freely after being adjusted to a proper position. Of course, adjustment of the slide device 106 is not limited to the use of the bolt 107, and the slide device 106 may be adjusted in position by a gear, a motor, or the like.

In this embodiment, the achromatic lens set 113 is fixed by the fixing device 102, but we also need to prevent the fixing device 102 from blocking the emergence of the small-angle light 121, so it is preferable that the fixing device 102 includes a circular ring 102a disposed around the achromatic lens set 113, a base 102b is disposed on the circular ring 102a, and the size of the base 102b is smaller than that of the achromatic lens set 113. The achromatic lens group 113 is fixed by a circular ring 102a, wherein the circular ring 102a is circumferentially disposed around the achromatic lens group 113, thereby avoiding the blocking of the light 121 by the fixing means 102. However, since it is difficult to fix the chromatic aberration compensating lens group 113 only by the ring 102a of the fixing device 102, the ring 102a is provided with the base 102 b. The size of base 102b will be smaller than the size of achromatic lens group 113, and the size of achromatic lens group 113 will be smaller than that of ring 102 a. When the fixing device 102 and the achromatic lens set 113 are assembled, the achromatic lens set 113 is placed in the circular ring 102a but is clamped by the base 102b, and then glue is injected between the fixing device 102 and the achromatic lens set 113 to fix, so that the fixing is more convenient overall.

In order to deal with the increasingly serious energy crisis, the mainstream light source in the illumination field generally needs to consider a low-energy-consumption light source, and therefore, preferably, the light source 111 is an LED chip, and a white surrounding wall 103 is arranged around a light emitting region 111a of the LED chip. The LED chip has the advantages of low energy consumption, long service life and the like, is low in price and is very suitable for being used as a light source of the scheme. Most of the existing LED chips are rectangular, the light emitting area of the LED chip, namely the light emitting area 111a of the light source 111, is also rectangular, light spots finally formed by applying the rectangular LED chip to the scheme are images of the LED chip, and the light spots can also be rectangular at the moment, but in the field of illumination, people hopefully obtain a circular light spot. A white fence 103 is wound around the light emitting region 111a of the LED chip. Because the LED chip emits lambertian light, that is, the light beam emitted from the LED chip randomly exits to the periphery, the white enclosing wall 103 surrounds the LED chip light emitting area 111a, and the outer contour of the white enclosing wall 103 is made into a circle. The high-angle light 122 which is emitted by the LED chip to the periphery and cannot be directly emitted will irradiate the white surrounding wall 103, and this part of light will also be emitted after being scattered and reflected by the white surrounding wall 103, i.e. the LED chip and the white surrounding wall 103 correspond to a circular light emitting area, so the finally formed light spot will also be circular.

Although the white surrounding wall 103 having a circular outer contour is used, in this method, although the spot shape of the emitted small-angle light 121 is changed, the white surrounding wall 103 is difficult to manufacture, and the light emitting area of the light emitting region 111a is increased. In the case where the optical power of the light source 111 is not changed, the light emitting area increases and the light intensity decreases as is known from the conservation of etendue, and this result is not desirable. It is preferable that the light source further includes a diaphragm 104, the diaphragm 104 includes a circular diaphragm hole 104a, the diaphragm 104 covers the light emitting region 111a and the white surrounding wall 103, and the diameter of the diaphragm hole 104a is larger than the side length of the light emitting region 111a and smaller than the length of the diagonal line of the light emitting region 111 a. In order to minimize the intensity of the small-angle light 121 that affects the exit, and at the same time, the exit of the small-angle light 121 forms a circular spot, we introduce the element of the diaphragm 104, and the diaphragm 104 has a circular diaphragm hole 104 a. The light emitting area 111a and the white surrounding wall 103 are covered with the diaphragm 104. in this method, the area of the diaphragm hole 104a corresponds to a virtual light emitting area, and the spot formed by the small-angle light 121 emitted through the diaphragm 104 is a circular spot. The diameter of the diaphragm hole 104a cannot be larger than the diagonal length of the light emitting region 111a so as not to increase the light emitting area, but at the same time, the diameter of the diaphragm hole 104a needs to be larger than the shortest side length of the light emitting region 111a so as to ensure that the small-angle light 121 can be emitted to the maximum extent.

In summary, in the present embodiment, the converging lens 112 is selected to converge the light emitted from the light emitting region 111a, so that part of the large-angle light 122 can be converted into the small-angle light 121 to be emitted finally, and further the brightness of the emitted light is increased; the existence of the achromatic lens group 113 enables the emitted small-angle light 121 to be achromatic, and avoids chromatic aberration in the emitted light; the small-angle light 121 passes through the collimating lens 114, and the collimating lens 114 angle-corrects the small-angle light 121 again, so that the small-angle light 121 becomes a more collimated light beam to exit.

Example 2:

laser lighting is an emerging lighting technology in recent years, has the advantages of higher brightness, lower energy consumption, longer service life and the like, and is very suitable for the scheme. As shown in fig. 7-8, preferably, the light source 211 is a luminescent wavelength conversion device 211 b; the laser diode 211c is further included, the laser diode 211c emits laser light 223 to excite the wavelength conversion device 211b, and the wavelength conversion device 211b is excited to emit stimulated light. The laser light 223 emitted from the laser diode 211c has the advantage of high brightness, and the stimulated light obtained by the laser light 223 exciting the wavelength conversion device 211b also has the advantage of high brightness, and the stimulated light emitted from the wavelength conversion device 211b is the small-angle light 221 and the large-angle light 222 emitted from the light emitting region 211a in this embodiment. In order to facilitate the emission of the received laser light, the wavelength conversion device 211b is preferably of a transmissive type, that is, the laser light 223 enters from one side of the wavelength conversion device 211b, and the received laser light generated by the wavelength conversion device 211b converting the laser light 223 is emitted from the other side of the wavelength conversion device 211 b. Preferably, the wavelength conversion device 211b includes a transparent heat conducting substrate 211d, a fluorescent material 211e is disposed on a side of the transparent heat conducting substrate 211d away from the laser diode 211c, and a reflective film 211f that transmits laser light and reflects the received laser light is disposed between the transparent heat conducting substrate 211d and the fluorescent material 211 e. The wavelength conversion device 211b generates a large amount of heat when converting the laser light 223, and in order to prevent the fluorescent material 211e from being damaged by thermal quenching due to the accumulation of heat, the wavelength conversion device 211b needs to include a transparent heat conductive substrate 211 d. The transparent heat conductive substrate 211d not only ensures heat transfer but also does not affect the penetration of the laser light 223. The energy density of the laser 223 is high, and when the laser 223 directly irradiates the fluorescent material 211e, the local temperature of the fluorescent material 211e may be rapidly increased, and finally the fluorescent material 211e is burnt, so that the fluorescent material 211e is disposed on the side of the transparent heat conducting substrate 211d away from the laser diode 211 c. The fluorescent material 211e acts as a lambertian illuminant when excited with light, and the excited light randomly emits to the periphery, which causes that part of the excited light cannot emit towards the beam-converging lens 212, resulting in waste of light energy. In order to avoid the waste of the received laser light, a reflective film 211f for transmitting the laser light 223 and reflecting the received laser light is arranged between the transparent heat-conducting substrate 211d and the fluorescent material 211e, so that the received laser light can only be emitted towards the beam-collecting lens 212, and the received laser light can be fully utilized. Of course, when the wavelength conversion device 211b is a transmissive type, it may be composed of not only the transparent heat conductive substrate 211d, the fluorescent material 211e, and the reflective film 211f, but also a fluorescent ceramic.

In summary, in the present embodiment, the wavelength conversion device 211b is used in combination with the laser diode 211c, so as to obtain brighter emitted light.

The above detailed description of the embodiments of the present invention is the best mode for carrying out the present invention, and can not be used to limit the protection scope of the present invention. Any equivalent modifications and substitutions for the utility model are within the scope of the protection of the present invention for those skilled in the art.

Claims (8)

1. An achromatic light emitting device comprising a light source for emitting light, said light source including a light emitting region, said light emitting region emitting light, characterized in that: the LED lamp also comprises a beam-converging lens, the beam-converging lens receives light emitted by a light-emitting area, the distance between the light-emitting area and the beam-converging lens is L, the radius of the beam-converging lens is R, the beam-converging angle of the beam-converging lens is A,

(ii) a One side of the beam-converging lens, which is far away from the light source, is provided with an achromatic lens groupThe lens group comprises a first convex lens and a first concave lens close to the first convex lens, and the dispersion coefficient of the first concave lens is smaller than that of the first convex lens; a collimating lens is arranged on one side of the achromatic lens group away from the light source;

the achromatic lens group is circumferentially provided with a fixing device in a surrounding manner, and the fixing device is connected with the fixing shell in a sliding manner;

be provided with the sliding tray on the lateral wall of set casing, the sliding tray extends to the internal surface of set casing by the surface of set casing, the sliding tray extends along the length direction of set casing, sliding connection has slider in the sliding tray, slider is connected with fixing device.

2. An achromatic light emitting device according to claim 1, wherein: the collimating lens covers one end of the fixed shell far away from the light source.

3. An achromatic light emitting device according to claim 1, wherein: the fixing device comprises a circular ring arranged around the achromatic lens group, a base is arranged on the circular ring, and the size of the base is smaller than that of the achromatic lens group.

4. An achromatic light emitting device according to claim 1, wherein: the bolt comprises an external thread, an internal thread corresponding to the external thread is arranged on the sliding device, the bolt penetrates through the sliding device along the length direction of the fixed shell, the fixed platform is arranged on the side wall of the fixed shell, and the bolt is connected with the fixed platform.

5. An achromatic light emitting device according to claim 1, wherein: the light source is an LED chip, and a white fence is arranged around a light emitting area of the LED chip in a winding mode.

6. An achromatic light emitting device according to claim 5, wherein: the LED white light source further comprises a diaphragm, wherein the diaphragm comprises a circular diaphragm hole, the diaphragm covers the light emitting area and the white surrounding wall, and the diameter of the diaphragm hole is larger than the side length of the light emitting area and smaller than the length of a diagonal line of the light emitting area.

7. An achromatic light emitting device according to claim 1, wherein: the light source is a luminous wavelength conversion device; the laser device also comprises a laser diode, wherein the laser diode emits laser to excite the wavelength conversion device, and the wavelength conversion device is excited to emit excited light.

8. An achromatic light emitting device according to claim 7, wherein: the wavelength conversion device comprises a transparent heat conduction substrate, wherein a fluorescent material is arranged on one side, away from the laser diode, of the transparent heat conduction substrate, and a reflection film for transmitting laser reflected received laser is arranged between the transparent heat conduction substrate and the fluorescent material.

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