Optical system capable of emitting light through small hole and lamp

Abstract

The utility model relates to the field of illumination, in particular to an optical system with light emitted from a small hole and a lamp. Comprising a Fresnel lens group, the Fresnel lens group comprises two Fresnel lenses, Fresnel surfaces of the two Fresnel lenses are oppositely arranged, and main optical axes of the two Fresnel lenses are collinear. According to the optical system, light rays are gathered according to the cross light emitting principle, limitation on the size of a lamp is removed under the condition that light is emitted through a small hole, and the installation and heat dissipation space of a lamp assembly is larger; a light source with higher power and an optical element with a better optical effect can be used for improving the brightness and the light emitting effect of light emitted from the small hole; by using the Fresnel lens with relatively thin lens thickness, the attenuation of light rays in the lens can be reduced while a large amount of materials are saved, the brightness of the emitted light rays is favorably improved, and the internal structure of the lamp can be more compact.

Description

Technical Field

[0001] The utility model relates to the field of lighting, and particularly relates to an optical system and a lamp with small-hole light emission. Background Art

[0002] In the field of lighting, in some usage scenarios (such as exhibition stand lighting, household lighting, etc.), in order not to damage the beauty and coordination of the overall environment, a "lamp-deprived" design is required: that is, the lamp components are hidden behind the exhibition stand, wall, roof, etc., and only small holes are left for light emission.

[0003] In the above scenarios, the aperture of the small hole (also called the light-emitting hole) is small. If a light source is used to irradiate close to the small hole, since there are no optical elements to adjust the light, the optical effect is difficult to meet the usage requirements; if a large-sized lamp is directly used in cooperation, the light energy that can be emitted from the small hole is less, and the brightness of the small-hole light emission is low, making it difficult to meet the usage requirements in some cases. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the problem that the brightness and optical effect of small-hole light emission in the background art are difficult to meet the usage requirements, and to provide an optical system and a lamp with small-hole light emission.

[0005] In a first aspect, the utility model provides an optical system with small-hole light emission, which includes a Fresnel lens group. The Fresnel lens group includes two Fresnel lenses with opposite Fresnel surfaces, and the principal optical axes of the two Fresnel lenses are collinear.

[0006] For the optical system with small-hole light emission provided by the utility model, the Fresnel lens group includes two relatively arranged Fresnel lenses. When in use, the converging effect of the Fresnel lens on light can be utilized to cross-converge the light energy passing through the Fresnel lens group in a local area on one side of the Fresnel lens group, and the small light-emitting hole with a small aperture is arranged in this local area, so as to realize small-hole light emission.

[0007] For the optical system of the utility model, the cross-light-emitting principle is used to gather light. Under the condition of meeting small-hole light emission, the limitation on the volume of the lamp is removed, and there is a larger installation and heat dissipation space left for the lamp components. A light source with a higher power and optical elements with better optical effects can be used to improve the brightness and light-emitting effect of the light emitted from the small hole; by using Fresnel lenses with relatively thin lens thicknesses, a large amount of materials can be saved while reducing the attenuation of light inside the lenses, which is beneficial to improving the brightness of the emitted light and making the internal structure of the lamp more compact.

[0008] Preferably, the Fresnel surface includes at least two concentric circular ring-shaped zones, and the zones are serrated.

[0009] Preferably, there are at least two annular zones on the Fresnel surface, and the shape of the annular zone is elliptical or fusiform.

[0010] Preferably, the sizes and shapes of the outer contours of the two Fresnel lenses are the same.

[0011] In some usage scenarios, the installation space left for the Fresnel lens group is limited. Using two Fresnel lenses with the same outer contour size and shape can rationally utilize the installation space and reduce the installation difficulty under the condition of meeting the usage requirements.

[0012] Preferably, the two Fresnel lenses have the same specifications.

[0013] Preferably, the optical system further includes a light condensing component for condensing light onto the incident surface of the Fresnel lens group.

[0014] In some usage scenarios, the light source is a point light source. Through the light condensing effect of the light condensing component, as much light emitted by the point light source as possible can be injected into the Fresnel lens group, realizing the full utilization of light energy and being beneficial to improving the light output effect.

[0015] Preferably, the light condensing component includes a convex lens. The convex lens is located on the light incident side of the Fresnel lens group, and the principal optical axis of the convex lens is collinear with the principal optical axis of the Fresnel lens group.

[0016] Preferably, the light condensing component includes a reflector cup, and the light output surface of the reflector cup faces and abuts against the Fresnel lens group.

[0017] The abutting setting can reduce the dissipation of light energy and improve the light energy utilization rate.

[0018] In a second aspect, the present utility model provides a small-hole light-emitting lamp, including an LED light source and the small-hole light-emitting optical system as described above.

[0019] Preferably, the LED light source is located on the principal optical axis of the Fresnel lens group.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] An optical system with small-hole light output provided by the present utility model. The Fresnel lens group includes two relatively arranged Fresnel lenses. During use, the converging effect of the Fresnel lens on light can be utilized to cross-converge the light energy passing through the Fresnel lens group to a local area on one side of the Fresnel lens group, and a light output hole with a smaller aperture is arranged in this local area, enabling small-hole light output. For the optical system of the present utility model, the cross-light output principle is used to aggregate light, which lifts the restriction on the volume of the lamp under the condition of meeting small-hole light output, leaving more installation and heat dissipation space for the lamp assembly. A light source with a higher power and optical elements with better optical effects can be used to improve the brightness and light output effect of the light emitted from the small hole; by using Fresnel lenses with relatively thin lens thicknesses, a large amount of materials can be saved while reducing the attenuation of light inside the lens, which is beneficial to improving the brightness of the emitted light and making the internal structure of the lamp more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the Fresnel lens group of the present utility model;

[0023] Figure 2 is a structural schematic diagram of the Fresnel lens of the present utility model;

[0024] Figure 3 is a structural schematic diagram of the Fresnel lens group and a convex lens of the present utility model;

[0025] Figure 4 is a cross-sectional view of the Fresnel lens group and a convex lens of the present utility model;

[0026] Figure 5 is a structural schematic diagram of the Fresnel lens group and a reflector cup of the present utility model;

[0027] Figure 6 is a cross-sectional view of the Fresnel lens group and a reflector cup of the present utility model;

[0028] Figure 7 is a light ray schematic diagram of the optical system with small-hole light output according to Embodiment 1 of the present utility model;

[0029] Figure 8 is a light ray schematic diagram of the optical system with small-hole light output according to Embodiment 2 of the present utility model.

[0030] Reference signs in the drawings:

[0031] 1 - Fresnel lens group;

[0032] 11 - Fresnel lens;

[0033] 12 - Fresnel surface;

[0034] 121 - zone;

[0035] 13 - Smooth surface;

[0036] 2 - Convex lens;

[0037] 3 - Reflector cup;

[0038] 31 - Light inlet hole; 32 - Light - emitting surface. Specific embodiments

[0039] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model fall within the scope of the present utility model.

[0040] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of the present utility model is usually placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0041] In addition, for terms such as "horizontal", "vertical", "hanging", "parallel", etc., it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present utility model.

[0042] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0043] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a number of" represent at least two. It can be any case of 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a case of more than 9.

[0044] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, where the terms "set", "installed", "connected", "connected", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0045] Embodiment 1

[0046] As Figure 1-2 shown, an optical system with small-hole light output provided in this embodiment includes a Fresnel lens group 1. The Fresnel lens group 1 includes two Fresnel lenses 11 with opposite Fresnel surfaces 12, and the principal optical axes of the two Fresnel lenses 11 are collinear.

[0047] The Fresnel lens 11 is also known as a thread lens, on which there is a Fresnel surface 12. The Fresnel surface 12 includes a number of annular bands 121 sleeved in sequence from small to large in size, and the annular bands 121 are serrated; through the number of serrated annular bands 121 (also called Fresnel zones) on the Fresnel surface 12, the Fresnel lens 11 can converge light, achieving an effect similar to that of a convex lens. At the same time, the lens thickness of the Fresnel lens 11 is relatively thin, which can save a large amount of materials while reducing the attenuation of light inside the lens, and is beneficial to improving the brightness of the emitted light.

[0048] Those skilled in the art can understand that the shape of the annular band 121 on the Fresnel lens 11 is preferably circular, as Figure 2 shown, and a number of annular bands 121 are concentric circles; in some usage scenarios, the shape of the annular band 121 can also be oval, parabolic, polygonal, or a part of the above shapes. For example, a spindle shape can be formed by combining two symmetric parabolas.

[0049] The principal optical axis is the axis of symmetry of the optical system. The principal optical axis of the Fresnel lens 11 is generally a straight line passing through the two foci of the Fresnel lens 11. When the shape of the annular band 121 is a concentric circle, the principal optical axis is the central axis of symmetry passing through the center of the annular band 121 on the Fresnel lens 11. The principal optical axes of the two Fresnel lenses 11 are collinear, that is, the principal optical axes of the two Fresnel lenses 11 coincide on the same straight line. For the convenience of description, this application defines this straight line as the principal optical axis of the Fresnel lens group 1.

[0050] On the other side of the Fresnel lens 11 opposite to the Fresnel surface 12, it can be a smooth surface 13. When in use, light can enter from the smooth surface 13 or the Fresnel surface 12 and exit from the other side; in some usage scenarios, the smooth surface 13 is a plane, but it does not exclude setting the smooth surface 13 as a curved surface according to the needs of the usage scenario.

[0051] The Fresnel lens group 1 includes two relatively arranged Fresnel lenses 11. When in use, light can enter from one side of the Fresnel lens group 1 and exit from the other side after converging and crossing; for the convenience of description, in this application, the side where light enters is defined as the light incident side, the side where light exits is defined as the light exit side, and the light receiving surface of the Fresnel lens group 1 on the light incident side is defined as the incident surface.

[0052] For this application, the aperture of the small hole in small-hole light output can be 5 - 30 mm; more preferably 10 - 20 mm, or 5 - 15 mm, or 10 - 15 mm.

[0053] In summary, an optical system for small-hole light output provided by the present utility model, the Fresnel lens group 1 includes two relatively arranged Fresnel lenses 11. When in use, the converging effect of the Fresnel lens 11 on light can be utilized to cross-converge the light energy passing through the Fresnel lens group 1 to a local area on one side of the Fresnel lens group 1, and the small light output hole with a smaller aperture is arranged in this local area, so as to achieve small-hole light output.

[0054] The optical system of the present utility model uses the principle of cross light output to concentrate light, lifts the restriction on the volume of the lamp under the condition of meeting small-hole light output, leaves more installation and heat dissipation space for the lamp assembly, and can use a light source with a higher power and optical elements with better optical effects to improve the brightness and light output effect of the light emitted from the small hole; by using the Fresnel lens 11 with a relatively thin lens thickness, a large amount of materials can be saved while reducing the attenuation of light inside the lens, which is beneficial to improving the brightness of the emitted light and can also make the internal structure of the lamp more compact.

[0055] In a preferred usage scenario, the Fresnel lens group 1 can be regarded as an optical whole with a converging effect, and it has foci on both sides; the point light source is placed at the focus on one side of the Fresnel lens group 1, and at least part of the light energy emitted by the point light source can converge at the focus on the other side of the Fresnel lens group 1 after passing through the Fresnel lens group 1. When designing the lamp, the focus on the other side can be arranged in the small hole to achieve small-hole light output. It can be understood that since the point light source is not a point without volume in the true sense, but a local area in a point shape, and a reflection structure is usually arranged around the point light source to achieve single-sided light output, therefore, the light energy also usually converges at a local area in a point shape on the other side of the Fresnel lens group 1.

[0056] In one or several preferred embodiments, the sizes and shapes of the outer contours of two Fresnel lenses 11 in the same Fresnel lens group 1 are the same.

[0057] When designing a lamp, the installation space left for the Fresnel lens group 1 is often limited. Using two Fresnel lenses 11 with the same outer contour size and shape can rationally utilize the installation space and reduce the installation difficulty under the condition of meeting the light concentration requirements.

[0058] Further preferably, to reduce the manufacturing cost and improve the optical accuracy, two Fresnel lenses 11 with the same specifications can be used.

[0059] In one or several preferred embodiments, the optical system further includes a light condensing component for condensing light rays onto the incident surface of the Fresnel lens group 1.

[0060] It can be understood that for a point light source with single-sided light emission, the beam angle of the light source is usually large, and part of the light energy cannot irradiate onto the Fresnel lens group 1, which easily causes energy waste. Therefore, a light condensing component can be set to condense the light rays so that more light energy can transmit through the Fresnel lens group 1, improving the utilization rate of light energy.

[0061] For this embodiment, as Figure 3 , 4 , shown in 7, the light condensing component includes a convex lens 2. The convex lens 2 is located on the light incident side of the Fresnel lens group 1, and the principal optical axis of the convex lens 2 is collinear with the principal optical axis of the Fresnel lens group 1.

[0062] It can be understood that the convex lens 2 has a light condensing effect. Placing the convex lens 2 between the light source and the Fresnel lens group 1, the light rays emitted by the light source will converge towards the principal optical axis after passing through the convex lens 2, reducing the beam angle to a certain extent and enabling more light energy to enter the Fresnel lens group 1. In addition, the convex lens 2 can also change the direction of the light rays. When the light source is on the principal optical axis of the Fresnel lens group 1, the condensing effect of the convex lens 2 can make the intersection point of the light energy on the light emitting side of the Fresnel lens group 1 closer to the Fresnel lens group 1, which can reduce the length of the optical system in the direction of the principal optical axis and is beneficial to reducing the volume of the lamp.

[0063] Embodiment 2

[0064] As Figure 5-6 shown, the difference between the optical system with small hole light emission provided in this embodiment and that in Embodiment 1 is that in this embodiment, the light condensing component includes a reflecting cup 3, and the light emitting surface 32 of the reflecting cup 3 faces and abuts against the Fresnel lens group 1.

[0065] The reflector cup 3 can change the irradiation direction of light through reflection. From the perspective of the external structure, the reflector cup 3 includes a cup cavity formed by enclosing the cup wall. A light inlet hole 31 is provided on one side of the cup cavity, and a light outlet hole is provided on the other side. The light emitted by the light source enters the reflector cup from the light inlet hole 31 and can be emitted from the light outlet hole directly or after one or more reflections on the cup wall.

[0066] For this embodiment, at the position of the light outlet hole, the interface between the cup cavity of the reflector cup 3 and the outside is defined as the light-emitting surface 32. The light-emitting surface 32 is in contact with the Fresnel lens group 1, which can make more light energy emitted from the reflector cup 3 enter the Fresnel lens group 1, reduce the dissipation of light energy, and improve its utilization rate.

[0067] As Figure 8 shown, it can be understood that in some usage scenarios, since the reflector cup 3 will cause some light to deflect at a large angle, the light emitted by the light source may form multiple intersection points on the light-emitting side of the Fresnel lens group 1. After actual tests by the applicant, it is found that the presentation effect of the light spot is a bright spot located in the center and several light rings surrounding the bright spot. Most of the light energy still converges on the central bright spot and its vicinity, and this implementation method can still achieve small-hole light emission.

[0068] Embodiment 3

[0069] A small-hole light-emitting lamp provided in this embodiment includes an LED light source and an optical system for small-hole light emission as described in Embodiment 1 or 2.

[0070] The LED light source can be an LED lamp bead or the like.

[0071] Preferably, the LED light source is located on the main optical axis of the Fresnel lens group 1.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical system with a pinhole emitting light, characterized in that: The invention comprises a Fresnel lens group (1), wherein the Fresnel lens group (1) comprises two Fresnel lenses (11) whose Fresnel surfaces (12) are arranged opposite to each other, and the main optical axes of the two Fresnel lenses (11) are collinear.

2. The pinhole light emitting optical system according to claim 1, characterized in that: The Fresnel surface (12) comprises at least two concentric annular ring zones (121), and the ring zones (121) are sawtooth-shaped.

3. The pinhole light emitting optical system according to claim 1, characterized in that: The Fresnel surface (12) has at least two annular zones (121), and the shape of the annular zones (121) is elliptical or shuttle-shaped.

4. The pinhole light emitting optical system according to claim 1, characterized in that: The outer contours of the two Fresnel lenses (11) are identical in size and shape.

5. The pinhole light emitting optical system according to claim 4, characterized in that: The two Fresnel lenses (11) have the same specifications.

6. The pinhole light emitting optical system according to any one of claims 1 to 5, characterized in that: It also comprises a light-gathering component, which is used to converge light onto the incident surface of the Fresnel lens group (1).

7. The pinhole light emitting optical system according to claim 6, characterized in that: The focusing assembly comprises a convex lens (2), the convex lens (2) is located on the light incident side of the Fresnel lens group (1), and the main optical axis of the convex lens (2) is colinear with the main optical axis of the Fresnel lens group (1).

8. The pinhole light emitting optical system according to claim 6, characterized in that: The focusing assembly comprises a reflective cup (3), wherein a light emitting surface (32) of the reflective cup (3) faces toward and abuts against the Fresnel lens group (1).

9. A light fixture with a small hole for emitting light, characterized in that: The optical system comprises an LED light source and a pinhole light-emitting optical system as claimed in any one of claims 1 to 8.

10. The pinhole light emitting lamp according to claim 9, characterized in that: The LED light source is located on the main optical axis of the Fresnel lens group (1).

Images