An achromatic collimating light-emitting device and a lamp.

Abstract

The present invention discloses an achromatic collimated light-emitting device, comprising a light source, wherein the light emitted by the light source comprises a first angle light and a second angle light whose luminous angle is greater than that of the first angle light, and an angle selection device, wherein the angle selection device comprises a light outlet, and the first angle light emits toward the light outlet; and an achromatic lens group, wherein the first angle light is emitted from the light outlet and then passes through the achromatic lens group before being emitted, wherein the achromatic lens group comprises a first concave lens close to the light outlet and a first convex lens far from the light outlet, wherein the dispersion coefficient of the first concave lens is smaller than that of the first convex lens, and the first convex lens and the first concave lens are close to each other; and a second convex lens, wherein the first angle light passes through the achromatic lens group and the second convex lens in sequence and finally is collimated and emitted. The technical solution achieves elimination of the chromatic aberration of the light emitted by the achromatic lens group by adjusting the position adjustment device to adjust the distance between the achromatic lens group and the light source.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, in particular to a lighting device with achromatic aberration function. Background Art

[0002] With the development of lighting technology, it has become more and more mature. In order to collect and focus light in lighting devices, a convex lens is usually added to the light path to collect light. Because of the addition of a convex lens, the light emitted from the convex lens will be dispersed. The so-called dispersion phenomenon is that a beam of white light parallel to the main optical axis is shot to a thin lens made of glass placed in the air (n≈1). Due to the scattering of light, different wavelengths of light emitted from the lens are deflected differently. The refractive index of red light is n L红 Less than the refractive index of violet light n L紫 , so the focal length of the lens corresponding to red light is f 红 Greater than the focal length f of the lens corresponding to violet light 紫 . Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned traditional technology. In view of the deficiencies of the prior art, the present invention invents a chromatic aberration lighting device.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: an achromatic collimated light-emitting device, comprising a light source, the light emitted by the light source comprises a first angle light and a second angle light having a light-emitting angle greater than the first angle light, characterized in that: it also comprises an angle selection device, the angle selection device comprises a light outlet, the first angle light emits toward the light outlet;

[0005] It also includes an achromatic lens group, the first angle light is emitted from the light outlet and then passes through the achromatic lens group and then is emitted, the achromatic lens group includes a first concave lens close to the light outlet and a first convex lens far from the light outlet, the dispersion coefficient of the first concave lens is smaller than the dispersion coefficient of the first convex lens, and the first convex lens and the first concave lens are close to each other;

[0006] It also includes a second convex lens, and the first angle light passes through the achromatic lens group and the second convex lens in sequence, and finally is collimated and emitted.

[0007] As an improvement of the above technical solution: the angle selection device also includes a light recycling device, the light recycling device includes a reflecting surface, the second angle light is emitted toward the reflecting surface, and the second angle light is reflected by the reflecting surface and then returns to the light source.

[0008] As an improvement of the above technical solution: the reflecting surface is arranged around the light outlet, the reflecting surface is a part of a spherical surface, and the light source is located at the center of the spherical surface.

[0009] As an improvement of the above technical solution: it also includes a position adjustment device, which is used to adjust the distance between the achromatic lens group and the light source.

[0010] As an improvement of the above technical solution: the first concave lens and the first convex lens are glued together.

[0011] As an improvement of the above technical solution: the light source is an LED chip, the LED chip includes a light-emitting area, and the light-emitting area is surrounded by a white wall.

[0012] As an improvement of the above technical solution: it also includes an aperture, which covers the luminous area and the white wall; a circular light hole is set on the aperture, and the diameter of the light hole is larger than the side length of the luminous area and smaller than the length of the diagonal of the luminous area.

[0013] As an improvement of the above technical solution: the light source is a wavelength conversion device, and also includes a laser light-emitting device for exciting the wavelength conversion device.

[0014] As an improvement of the above technical solution: the wavelength conversion device is a transmissive fluorescent film, the laser light-emitting device emits laser from a side away from the angle selection device, and the transmissive fluorescent film is excited by the laser and emits fluorescence toward the angle selection device; or it also includes a reflector, the laser emitted by the laser light-emitting device is twisted by the reflector to excite the wavelength conversion device, and the wavelength conversion device is a reflective fluorescent film, and the reflective fluorescent film is excited by the laser and emits fluorescence toward the angle selection device.

[0015] Due to the adoption of the above technical solution, compared with the prior art, the technical solution adjusts the distance between the achromatic lens group and the light source by adjusting the position adjustment device, thereby eliminating the chromatic aberration of the light emitted by the achromatic lens group.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of an achromatic collimated light-emitting device.

[0018] Figure 2 It is a schematic diagram of the structure of LED chips and white walls.

[0019] Figure 3 It is a schematic diagram of the structure of LED chips, white walls and apertures.

[0020] Figure 4 It is a cross-sectional view of another achromatic collimated light-emitting device.

[0021] Figure 5 It is a cross-sectional view of another achromatic collimated light-emitting device. DETAILED DESCRIPTION

[0022] Embodiment 1:

[0023] like Figure 1-3 As shown, an achromatic collimated light-emitting device includes a light source, which provides a white light mixed with at least two different colors (different wavelengths). A preferred embodiment is that the light source is an LED chip 101a, and the LED chip 101a includes a light-emitting area 109. The LED chip 101a is cheap and easy to obtain. Since the LED chip 101a emits light at all angles, the light emitted by the light-emitting area 109 includes a first angle light 121 and a second angle light 122 whose light-emitting angle is greater than the first angle light 121. Since the light emitted by the LED chip 101a needs to be focused or collimated in practical applications, whether it is focused or collimated, it needs to pass through an achromatic lens group, wherein the second angle light 122 with a large angle cannot be collected by the achromatic lens group, and at this time, the part of the light that can be collected by the achromatic lens group should be selected. A preferred embodiment is that it also includes an angle selection device, and the angle selection device includes a light outlet 102, and the first angle light 121 emits light toward the light outlet 102. The first angle light 121 emitted from the light outlet 102 is the light whose luminous angle meets the requirements. Light with a large angle cannot be gathered and focused by the achromatic lens group. Therefore, the angle selection device selects the first angle light 121 with a small luminous angle according to whether it is emitted from the light outlet 102.

[0024] When a beam of light passes through a convex lens, since a convex lens is generally composed of two spherical surfaces (or a spherical surface and a plane), the refractive index is n L A lens is placed in a medium with a refractive index of n. When the angle between the light emitted from the object point and the principal optical axis of the lens is very small (generally less than 5°), the focal length formula of the thin lens is Where r1 and r2 are the radii of the two refractive surfaces of the lens. Light of different wavelengths (light of different colors) has different n Lvalue, thus causing different wavelengths of light to have different focal lengths f after passing through the convex lens. Since different wavelengths of light have different focal lengths f after passing through the same lens, dispersion occurs. In order to solve the dispersion phenomenon generated after light passes through the lens. In order to eliminate dispersion, a preferred embodiment is to further include an achromatic lens group, wherein the first angle light 121 is emitted from the light outlet 102 and then passes through the achromatic lens group to emit achromatic light 123, and the emission angle of the achromatic light 123 is smaller than the emission angle of the first angle light 121. The achromatic lens group provided in this embodiment includes a first concave lens 103 close to the light outlet 102 and a first convex lens 104 far away from the light outlet 102, the dispersion coefficient of the first concave lens 103 is smaller than the dispersion coefficient of the first convex lens 104, and the first convex lens 104 and the first concave lens 103 are close to each other. According to optical principles, the smaller the dispersion coefficient, the greater the degree of dispersion. In this embodiment, the first convex lens 104 serves to converge the first angle light 121. According to optical principles, the first convex lens 104 converges blue light to a greater extent than red light. The first concave lens 103 diverges the first angle light 121. According to optical principles, the first concave lens 103 diverges blue light to a greater extent than red light. Because the device ultimately requires parallel light, in order to collimate the achromatic light 123, the technical solution makes the luminous angle of the achromatic light 123 smaller than the luminous angle of the first angle light 121. Therefore, the ability of the first convex lens 104 to converge and gather light needs to be greater than the ability of the first concave lens 103 to diverge light. Since the first concave lens 103 and the first convex lens 104 have different light bending abilities, dispersion is caused. In order to offset the dispersion caused by the first convex lens 104 converging and gathering the first angle light 121 , this embodiment increases the dispersion degree of the first concave lens 103 , that is, the dispersion coefficient of the first concave lens 103 is smaller than that of the first convex lens 104 .

[0025] The achromatic lens group is a combination of a first concave lens 103 and a first convex lens 104. The first angle light 121 is emitted after being diverged and gathered. At this time, the gathering ability of the achromatic light 123 is insufficient, and the achromatic light 123 cannot be collimated and emitted. A preferred embodiment is to further include a second convex lens 105. The first angle light 121 passes through the achromatic lens group and the second convex lens 105 in sequence, and finally collimated and emitted. The function of the second convex lens 105 in this embodiment is to collimate the achromatic light 123.

[0026] Through the above analysis, it can be known that the achromatic lens group can only gather the first angle light 121 with a small luminous angle, and the second angle light 122 (large angle light) emitted by the LED chip 101a including the luminous area 109 cannot enter the achromatic lens group. At this time, the second angle light 122 cannot be used, resulting in a waste of energy, which does not meet the requirements of environmental protection and energy saving. A preferred embodiment is that the angle selection device also includes a light recycling device 106, and the light recycling device 106 includes a reflecting surface 107, and the second angle light 122 emits toward the reflecting surface 107, and the second angle light 122 is reflected by the reflecting surface 107 and returns to the light source. The light recycling device 106 reflects the second angle light 122 back to the light emitting area 109 through the reflecting surface 107. Since the light emitting area 109 of the LED chip 101a has a scattering and reflecting effect on the light emitted by itself, the light reflected back to the light emitting area 109 by the reflecting surface is re-adjusted by the light emitting area 109 and then emitted. Part of the second angle light 122 is converted into the first angle light 121 after the light emitting angle is adjusted by the light emitting area and emitted from the light outlet 102. This technical solution fully utilizes the light emitted by the LED chip 101a, improves the utilization rate of light, and plays a role in green and environmental protection.

[0027] Through the above analysis, it can be known that the key to the reflection surface 107 converting the second angle light 122 into the first angle light 121 that can be used is the setting of the reflection surface 107. Only by reasonably designing the position and surface shape of the reflection surface 107 can it be ensured that the second angle light 122 reflected by the reflection surface 107 completely returns to the light-emitting area 109 of the LED chip 101a. A preferred embodiment is that the reflection surface 107 is arranged around the light outlet 102, the reflection surface 107 is a part of the spherical surface, and the light source is located at the center of the spherical surface. According to the optical principle, when the light-emitting area 109 is located at the center of the spherical surface, the light emitted by the light-emitting area 109 is reflected by the spherical surface and finally returns to the light-emitting area 109. Since in optics, any beam of light emitted by the point light source located at the center of the spherical surface must return to the light source after being reflected by the spherical surface, but at this time the light-emitting area 109 is a light-emitting surface, which does not fully conform to the optical principle. According to the applicant's multiple experiments, when the luminous area 109 moves toward the reflecting surface 107, the proportion of the second angle light 122 reflected by the reflecting surface 107 returning to the luminous area 109 gradually increases, and gradually decreases after reaching a limit value.

[0028] In order to meet the needs of users during use, the light emitting device needs to adjust the focal length of the light 124 emitted by the light emitting device. In order to be able to adjust the focal length of the light 124 emitted by the light emitting device. A preferred embodiment is that it also includes a position adjustment device, which is used to adjust the distance between the achromatic lens group and the light source. The position adjustment device includes an adjustment ring 108, the adjustment ring 108 is fixedly connected to the achromatic lens group, and the achromatic lens group moves with the adjustment ring 108 when the adjustment ring 108 is moved. The focal length adjustment of the achromatic lens group becomes easier and simpler.

[0029] Since the achromatic lens group includes the first convex lens 104 and the first concave lens 103, in order to achieve the effect of achromatization during the use of the achromatic lens group, the first convex lens 104 and the first concave lens 103 need to be closely attached together, and the change in the distance between the two will also cause the change in the chromatic aberration of the emitted light 124. In order to reduce the change in the chromatic aberration of the emitted light 124, a preferred implementation is that the first concave lens 103 and the first convex lens 104 are glued together. The first concave lens 103 and the first convex lens 104 are glued together as a whole, the stability of the achromatic lens group is enhanced, and the focus adjustment accuracy is high.

[0030] Since the light source in this technical solution uses LED chip 101a, most of the existing LED chips 101a are rectangular. The light spot finally formed by the application of rectangular LED chip 101a in this technical solution is the imaging of LED chip 101a. At this time, the light spot is still square. In the field of Zhao Mingliang, we prefer to obtain a circular light spot. A preferred implementation is as follows: Figure 2 As shown, the luminous area 109 is surrounded by a white wall 110. Since the luminous area 109 is not a point light source, the second angle light 122 reflected by the reflective surface 107 returns to the luminous area 109 and the surrounding area. At this time, the white wall 110 surrounds the rectangular luminous area 109, and the outer contour of the white wall 110 is made into a circle, which is equivalent to a circular light source emitting light, and the final light spot is also circular.

[0031] The outer contour of the white wall 110 is made into a circle. Although this method changes the spot shape of the emitted light 124, it is difficult to make the white wall 110 into a circle. Secondly, this is equivalent to increasing the light-emitting area of ​​the light-emitting area 109. When the light power of the light source remains unchanged, according to the conservation of optical etendue, the light intensity is weakened when the light-emitting area is increased, which is not what we want. A preferred implementation is as follows: Figure 3As shown, the diaphragm 111 is also included, and the diaphragm 111 covers the light-emitting area 109 and the white wall 110; a circular light hole 112 is arranged on the diaphragm 111, and the diameter of the light hole 112 is greater than the side length of the light-emitting area 109 and less than the length of the diagonal of the light-emitting area 109. In order to minimize the influence on the light intensity of the emitted light 124, the emitted light 124 must also form a circular light spot. In this technical solution, an diaphragm 111 with a circular through hole 112 is added, and the diaphragm 111 is covered on the light-emitting area 109 and the white wall 110. The second angle light 122 reflected by the reflective surface returns to the area of ​​the light-emitting area 109 and the white wall 110 exposed by the through hole 112. In this technical solution, the through hole 112 area is equivalent to a virtual light source, and the light spot of the emitted light 124 obtained at this time is a circular light spot. In order not to increase the luminous area of ​​the virtual light source, the area of ​​the through hole 112 cannot be larger than the length of the diagonal of the luminous area 109. In order to ensure that most of the light emitted by the luminous area 109 can be emitted from the through hole 112, the diameter of the through hole 112 is larger than the length of the shortest side of the luminous area 109.

[0032] Embodiment 2:

[0033] Although LED chips are cheap as light sources, they have many disadvantages in long-distance, high-brightness lighting. In order to expand the application range of achromatic collimated light-emitting devices, it is necessary to use light sources that can meet the requirements of long-distance, high-brightness use. Figure 4 As shown, a color-free collimated light-emitting device, the light source is a wavelength conversion device, and also includes a laser light-emitting device 213 for exciting the wavelength conversion device. The wavelength conversion device is a transmissive fluorescent sheet 201b, and the laser light-emitting device 213 emits a laser from a side away from the angle selection device. The transmissive fluorescent sheet 201b is excited by the excitation emitted by the laser light-emitting device 213 and emits fluorescence toward the angle selection device. The light source is a transmissive fluorescent sheet 201b, and the laser light-emitting device 213 excites the transmissive fluorescent sheet 201b to emit light to replace the LED chip. The light emitted by the transmissive fluorescent sheet 201b has higher power and stronger collimation. It meets the needs of high-power long-distance lighting.

[0034] Embodiment 3:

[0035] The light source in Example 2 is a transmissive fluorescent sheet. In the transmissive fluorescent sheet, the laser needs to pass through a transparent heat-conducting substrate to excite the fluorescent material to emit light. In the process of the laser passing through the transparent substrate, the laser will inevitably be lost. In the field of laser lighting, there are also reflective fluorescent sheets. Reflective fluorescent sheets do not require the laser to pass through a transparent substrate and will not cause laser loss. However, how to guide the laser to the surface of the fluorescent material to excite the fluorescent material without blocking the fluorescence emitted by the fluorescent material requires the design of the optical path. Figure 4As shown, the embodiment further includes a reflector 314, the wavelength conversion device is a reflective fluorescent sheet 301c, the laser emitted by the laser light emitting device 313 is twisted by the reflector 314 and then excites the reflective fluorescent sheet 301c, and the reflective fluorescent sheet 301c emits fluorescence toward the angle selection device after being excited by the laser. Compared with Example 2, the position of the reflective fluorescent sheet 301c is still set at the position of the light source, and a reflector 314 is added to twist the laser emitted by the laser light emitting device 313 onto the reflective fluorescent sheet 301c, and the reflector 314 does not block the first angle light 321 emitted by the reflective fluorescent sheet 301c, so it does not affect the spot shape of the outgoing light 324.

[0036] The specific embodiments of the present invention are described in detail above, and the contents are the best embodiments of the present invention and cannot be used to limit the protection scope of the present invention. For those skilled in the art, any equivalent modifications and substitutions made to the invention are also within the scope of the present invention.

Claims

1. An achromatic collimated light-emitting device, comprising a light source, wherein the light emitted by the light source comprises a first angle light and a second angle light having a light-emitting angle greater than the first angle light, characterized in that: It also includes an angle selection device, the angle selection device includes a light outlet, and the first angle light is emitted toward the light outlet; It also includes an achromatic lens group, the first angle light is emitted from the light outlet and then passes through the achromatic lens group to emit achromatic light, the achromatic lens group includes a first concave lens and a first convex lens, the divergence angle of the achromatic light is smaller than the divergence angle of the first angle light, the dispersion coefficient of the first concave lens is smaller than the dispersion coefficient of the first convex lens, and the first convex lens and the first concave lens are close to each other; It also includes a second convex lens, and the first angle light passes through the achromatic lens group and the second convex lens in sequence, and finally is collimated and emitted.

2. The achromatic collimated light-emitting device according to claim 1, characterized in that: The angle selection device also includes a light recycling device, which includes a reflecting surface. The second angle light is emitted toward the reflecting surface, and the second angle light is reflected by the reflecting surface and then returns to the light source.

3. The achromatic collimated light-emitting device according to claim 2, characterized in that: The reflecting surface is arranged around the light outlet, the reflecting surface is a part of a spherical surface, and the light source is located at the center of the spherical surface.

4. The achromatic collimated light-emitting device according to claim 1, characterized in that: The invention also comprises a position adjusting device, which is used for adjusting the distance between the achromatic lens group and the light source.

5. The achromatic collimated light-emitting device according to claim 1, characterized in that: The first concave lens is glued together with the first convex lens.

6. The achromatic collimated light-emitting device according to claim 2, characterized in that: The light source is an LED chip, which includes a light-emitting area surrounded by a white wall.

7. The achromatic collimated light-emitting device according to claim 6, characterized in that: It also includes an aperture, which covers the light-emitting area and the white wall; a circular light-through hole is arranged on the aperture, and the diameter of the light-through hole is larger than the side length of the light-emitting area and smaller than the length of the diagonal line of the light-emitting area.

8. The achromatic collimated light-emitting device according to claim 1 or 2, characterized in that: The light source is a wavelength conversion device and also includes a laser light emitting device for exciting the wavelength conversion device.

9. The achromatic collimated light-emitting device according to claim 8, characterized in that: The wavelength conversion device is a transmissive fluorescent sheet, and the laser light-emitting device emits laser from a side away from the angle selection device. The transmissive fluorescent sheet emits fluorescence toward the angle selection device after being excited by the laser; or it also includes a reflector, and the laser emitted by the laser light-emitting device is twisted by the reflector to excite the wavelength conversion device. The wavelength conversion device is a reflective fluorescent sheet, and the reflective fluorescent sheet emits fluorescence toward the angle selection device after being excited by the laser.

10. A lamp, characterized in that: A chromatic aberration collimated light-emitting device comprising any one of claims 1-9.

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