Flash lamp device

Abstract

The invention provides a flash lamp device. The strobe device includes: a light source; the optical element is located on the light emitting side of the light source, the optical element is used for shaping light emitted by the light source, the field angle of the flash lamp device is adjusted by adjusting the light source or the optical element, and the maximum irradiation angle of the flash lamp device is four times of the minimum irradiation angle. The flash lamp device solves the problem that a flash lamp device in the prior art is difficult to give consideration to the variable field angle and miniaturization at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting equipment, and in particular to a flash device. Background Art

[0002] With the development of lighting technology and electronic products, LED light sources have the advantages of simple color, high brightness, miniaturization and flat packaging. They are suitable for use in flash devices and can be used with mobile phones, tablets, cameras, and can also be used for LED lighting.

[0003] It is far from enough for a flash device to have only a light source LED. Optical elements need to be matched to readjust the divergence angle and brightness uniformity of the LED light source to meet the shooting requirements of different application scenarios, such as periscope, wide-angle and ultra-wide-angle in photography. Most flash devices are based on one or more light sources matching a primary optical lens or a secondary optical lens. Generally, the light source and the optical lens are aligned in the center. For example, in patent CN212691679U, a single LED light source is used to match a Fresnel lens, and the light source and the Fresnel lens are aligned in the center; in patent CN218721034U, the flash device is a single light source with multiple optical lenses. The increase in the number of lenses makes the light control more precise, but these existing technologies are difficult to achieve partition lighting and provide the same brightness for photography; if you want to achieve partition lighting and can apply different photography modes, even if the partition lighting of the light source is controlled by a circuit, under the premise that the light source and the optical lens are all aligned in the center, the center will be brighter and the edge uniformity will be poor, and the image quality is easy to be overexposed in the center. Therefore, it is a problem that the industry needs to solve to reasonably distribute brightness, change the beam divergence angle according to different camera modes, and achieve a relatively uniform light pattern at the center and edge of the target position when shooting.

[0004] In addition, there are also optical lenses that match multiple light sources, such as patent CN105987313A, which uses four light-emitting diodes, arranged in a 2×2 array, and finally uses a Fresnel lens to homogenize the light source. Patent CN207780448U uses four Fresnel lenses and four light sources, arranged in a 1×4 manner. However, the FOV of this type of flash device has only one fixed mode, and the application scenarios are limited.

[0005] At present, most of the terminal devices on the market have multi-camera system functions, and different focal lengths have different requirements for the field of view of the flash device. Correspondingly, certain requirements are also put forward for the flash that provides brightness for photography, hoping that the lighting area can be changed accordingly for the changing scene content, such as a flash device with variable FOV. The key to achieving FOV is that the light source has different light-emitting positions, or the distance between the light-distributing lens and the light source is different. In patent CN115857256A, the light source is arranged 3×3, with a primary optical lens and a Fresnel lens. When different light source areas are lit, the final emitted light beam divergence angle is also different, that is, the lighting can be adaptive to the changing scene content. In foreign patent US009992396B1, a single light source is used, and a motor collimation brake is used to move the optical device reflector cup or Fresnel lens, so as to achieve controllability of the beam angle and intensity. However, such a device will increase the size of the flash, and there will be a certain time delay, and the cost will also be greatly increased. Therefore, how to realize a small-sized, fast-response, and low-cost flash device under the premise of controllable FOV is the current difficulty.

[0006] That is to say, the flash device in the prior art has the problem that it is difficult to achieve both variable field angle and miniaturization at the same time. Summary of the invention

[0007] The main purpose of the present invention is to provide a flash device to solve the problem that the flash device in the prior art has a variable field of view and is difficult to be miniaturized at the same time.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a flash device, comprising: a light source; an optical element, wherein the optical element is located on the light-emitting side of the light source, and the optical element is used to shape the light emitted by the light source. The field angle of the flash device can be adjusted by adjusting the light source or the optical element, and the maximum irradiation angle of the flash device is 4 times the minimum irradiation angle.

[0009] Furthermore, the light source is one or more. When the light source is multiple, the multiple light sources consist of M*N light sources, where M is equal to or not equal to N.

[0010] Furthermore, the optical element is one or more of a Fresnel lens, a biconvex lens, a variable focus lens, and a biconcave lens.

[0011] Furthermore, there are multiple light sources that are independently arranged, and the multiple light sources are composed of M*N light sources. The optical element includes a Fresnel lens, and there are M*N Fresnel lenses. Each light source corresponds to a Fresnel lens, and M is equal to N. The field of view angle of the flash device can be selected by adjusting the brightness of the multiple light sources.

[0012] Further, the M*N light sources include a central light source and multiple peripheral light sources, the M*N Fresnel lenses include a central Fresnel lens and multiple peripheral Fresnel lenses, the central axis of the central light source coincides with the central axis of the central Fresnel lens, the central axis of each peripheral light source does not coincide with the central axis of its corresponding peripheral Fresnel lens, and in the corresponding peripheral Fresnel lenses and peripheral light sources, the central axis of the peripheral Fresnel lens is located on the side of the central axis of the peripheral light source away from the central light source.

[0013] Further, in the corresponding peripheral Fresnel lens and peripheral light source, a distance between a central axis of the peripheral Fresnel lens and a central axis of the peripheral light source is greater than 0 mm and less than or equal to 0.15 mm.

[0014] Furthermore, multiple light sources are arranged at intervals, multiple Fresnel lenses are arranged at intervals, and M=N=3, the 3*3 light sources include a central light source and eight peripheral side light sources, and only the central light source is lit. At this time, the field angle of the flash device is less than 50°; only four peripheral side light sources arranged in a cross are lit. At this time, the field angle of the flash device is greater than or equal to 50° and less than or equal to 85°; only eight peripheral side light sources are lit. At this time, the field angle of the flash is greater than 85° and less than or equal to 120°.

[0015] Furthermore, each light source is rectangular and has the same light-emitting area, and the multiple light sources form a rectangular structure; or the shapes of the multiple light sources include multiple rectangles and squares, the light-emitting areas of at least some of the multiple light sources are different, and the multiple light sources form a square structure.

[0016] Furthermore, the optical element further includes a biconvex lens, wherein the number of the biconvex lenses is M*N, and a biconvex lens is disposed between each corresponding group of light sources and the Fresnel lens.

[0017] Furthermore, the distance between a corresponding group of light sources and the Fresnel lens is greater than or equal to 0.1 mm and less than or equal to 0.2 mm; and / or the overall thickness of the flash device is less than 2.5 mm.

[0018] Furthermore, there is one light source, the optical element includes a variable focus lens, and the flash device also includes a circuit substrate and a shell. The light source is mounted on the circuit substrate, and the shell is covered on the circuit substrate and accommodates the light source and the variable focus lens therein.

[0019] Furthermore, the focal length adjustment range of the variable focus lens is greater than or equal to -5D and less than or equal to 20D, and the aperture of the variable focus lens is larger than the size of the light source.

[0020] Furthermore, the variable focus lens includes a first liquid lens and a second liquid lens connected in sequence along a direction away from the light source, the first liquid lens and the second liquid lens have the same density and different refractive index, and there is an interface between the first liquid lens and the second liquid lens. The field of view angle of the flash device can be adjusted by adjusting the curvature radius of the interface.

[0021] Furthermore, the radius of curvature of the adjustment interface is greater than or equal to 15D and less than or equal to 20D, and the field of view angle of the flash device is greater than or equal to 30° and less than or equal to 50°; the radius of curvature of the adjustment interface is greater than or equal to 7D and less than or equal to 10D, and the field of view angle of the flash device is greater than 50° and less than or equal to 90°; the radius of curvature of the adjustment interface is greater than or equal to 0D and less than or equal to 3D, and the field of view angle of the flash device is greater than 90° and less than or equal to 120°.

[0022] Furthermore, the optical element further includes a biconcave lens, and the biconcave lens is located on a side of the variable focus lens away from the light source.

[0023] Furthermore, the optical element further comprises a Fresnel lens, which is located on a side of the variable focus lens away from the light source, and a surface of the Fresnel lens facing the light source is an optical surface.

[0024] Furthermore, there are one or more Fresnel lenses. When there are multiple Fresnel lenses, the multiple Fresnel lenses are arranged in a rectangular array.

[0025] Applying the technical solution of the present invention, the flash device includes a light source and an optical element. The optical element is located on the light-emitting side of the light source. The optical element is used to shape the light emitted by the light source. The field of view angle of the flash device can be adjusted by adjusting the light source or the optical element. The maximum irradiation angle of the flash device is 4 times the minimum irradiation angle.

[0026] The optical element is located on the light-emitting side of the light source, and is used to shape the light emitted by the light source. The field angle of the flash device can be adjusted by adjusting the light source or the optical element. This arrangement makes the field angle of the flash device of the present application variable, thereby achieving a variable and controllable field angle. The optical element or the light source can be adjusted according to different camera modes to change the light beam divergence angle of the flash device to match different camera requirements, such as telephoto, wide-angle and ultra-wide-angle, thereby expanding the scope of application. At the same time, the addition of the optical element in the present application ensures miniaturization. In addition, the maximum irradiation angle of the flash device is 4 times the minimum irradiation angle, thereby making the field angle of the flash device of the present application adjustable in a wider range, which is more conducive to ensuring the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 A schematic diagram showing a flash device according to an optional example of the first embodiment of the present invention;

[0029] Figure 2 Shows Figure 1 Schematic diagram of the arrangement of light sources in;

[0030] Figure 3 Shows Figure 1 A top view of the flash device in FIG.

[0031] Figure 4 A schematic diagram showing another optional example of a flash device according to the first embodiment of the present invention;

[0032] Figure 5 A schematic diagram showing the arrangement of another light source according to the first embodiment of the present invention is shown;

[0033] Figure 6 A schematic diagram showing a flash device according to an optional example of the second embodiment of the present invention;

[0034] Figure 7 Shows Figure 6 A control flow chart of the flash device in FIG.

[0035] Figure 8 Shows Figure 6 Schematic diagram of assembly of light source and circuit substrate;

[0036] Fig. 9 Shows Figure 6 Schematic diagram of light output when the light source is matched with a variable focus lens;

[0037] FIG. 10A to FIG. 10C Schematic diagrams of light output when a light source is matched with a variable focus lens in three shooting modes are shown respectively;

[0038] FIG. 11A to FIG. 11C Schematic diagrams showing the lighting areas in three shooting modes respectively;

[0039] Fig.12 A schematic diagram showing another optional example of a flash device according to the second embodiment of the present invention;

[0040] Fig.13 A schematic diagram of a flash device according to another optional example of the second embodiment of the present invention is shown.

[0041] The above drawings include the following reference numerals:

[0042] 10. Light source; 11. Central light source; 12. Peripheral light source; 20. Fresnel lens; 21. Central Fresnel lens; 22. Peripheral Fresnel lens; 23. Optical surface; 30. Biconvex lens; 40. Variable focus lens; 41. First liquid lens; 42. Second liquid lens; 43. Interface; 50. Circuit substrate; 60. Housing; 70. Biconcave lens; 80. Optical axis. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0046] In order to solve the problem in the prior art that it is difficult to simultaneously achieve a variable field of view and miniaturization in a flash device, the present invention provides a flash device.

[0047] like Figures 1 to 13 As shown, the flash device includes a light source 10 and an optical element. The optical element is located on the light-emitting side of the light source 10. The optical element is used to shape the light emitted by the light source 10. The field of view angle of the flash device can be adjusted by adjusting the light source 10 or the optical element. The maximum irradiation angle of the flash device is 4 times the minimum irradiation angle.

[0048] The optical element is located on the light-emitting side of the light source 10. The optical element is used to shape the light emitted by the light source 10. The field angle of the flash device can be adjusted by adjusting the light source 10 or the optical element. This arrangement makes the field angle of the flash device of the present application variable, realizing a variable and controllable field angle. The optical element or the light source 10 can be adjusted according to different camera modes to change the light beam divergence angle of the flash device to match different camera requirements, such as telephoto, wide-angle and ultra-wide-angle, thereby expanding the scope of application. At the same time, the addition of the optical element in the present application ensures miniaturization. In addition, the maximum irradiation angle of the flash device is 4 times the minimum irradiation angle, so that the field angle of the flash device of the present application has a wider adjustable range, which is more conducive to ensuring the scope of application.

[0049] Specifically, the variable range of the field angle of the flash device of the present application is greater than or equal to 30° and less than or equal to 120°.

[0050] In an optional embodiment of the present application, there are one or more light sources 10. When there are multiple light sources 10, the multiple light sources 10 are composed of M*N light sources 10, where M is equal to or not equal to N. In this way, one light source 10 or multiple light sources 10 can be set according to actual needs and the size of the application product. Whether it is a flash device with one light source 10 or multiple light sources 10, a variable field of view can be achieved. When there are multiple light sources 10, the multiple light sources 10 are arranged in a rectangular array.

[0051] In an optional embodiment of the present application, the optical element is one or more of a Fresnel lens 20, a biconvex lens 30, a variable focus lens 40, and a biconcave lens 70. The optical element may be one of a Fresnel lens 20, a Fresnel lens 20 and a biconvex lens 30, a variable focus lens 40, a variable focus lens 40 and a biconcave lens 70, and a variable focus lens 40 and a Fresnel lens 20, and may be selected according to actual needs to ensure the design flexibility of the optical element of the present application.

[0052] The flash device of the present application is described below in conjunction with specific embodiments and drawings.

[0053] Embodiment 1

[0054] like Figures 1 to 5 As shown, the flash device of the first embodiment is described.

[0055] In the first embodiment, there are multiple light sources 10 and they are all independently arranged. The multiple light sources 10 are composed of M*N light sources 10. The optical element includes a Fresnel lens 20. There are M*N Fresnel lenses 20. Each light source 10 corresponds to a Fresnel lens 20. M is equal to N. The field angle of the flash device is selected by adjusting the brightness of the multiple light sources 10. There are multiple light sources 10 and multiple Fresnel lenses 20. The multiple Fresnel lenses 20 correspond to the multiple light sources 10 one by one.

[0056] refer to Figure 1 The M*N light sources 10 include a central light source 11 and a plurality of peripheral light sources 12, and the plurality of peripheral light sources 12 are arranged at intervals around the circumference of the central light source 11. The M*N Fresnel lenses 20 include a central Fresnel lens 21 and a plurality of peripheral Fresnel lenses 22, and the plurality of peripheral Fresnel lenses 22 are arranged at intervals around the circumference of the central Fresnel lens 21. The central axis of the central light source 11 coincides with the central axis of the central Fresnel lens 21, and the central axis of each peripheral light source 12 does not coincide with the central axis of its corresponding peripheral Fresnel lens 22. In the corresponding peripheral Fresnel lenses 22 and peripheral light sources 12, the central axis of the peripheral Fresnel lens 22 is located on the side of the central axis of the peripheral light source 12 away from the central light source 11. This arrangement makes the central light source 11 and the central Fresnel lens 21 in the center aligned, so as to ensure that the central Fresnel lens 21 can stably shape the emitted light of the central light source 11, and the peripheral light source 12 passes through the offset peripheral Fresnel lens 22, so that the central light is dispersed to the edge, thereby avoiding the situation that the center is bright and the edge is poorly uniform in the final display, avoiding the risk of overexposure in the center, greatly improving the lighting quality, and providing a more uniform flash device. At the same time, in the backlight, dim outdoor environment and other environments, appropriate supplementary light ensures the clarity and color correctness of the photo, making the photography quality higher.

[0057] Specifically, in the corresponding peripheral Fresnel lens 22 and peripheral light source 12, the distance between the central axis of the peripheral Fresnel lens 22 and the central axis of the peripheral light source 12 is greater than 0 mm and less than or equal to 0.15 mm. By reasonably restricting the distance between the central axis of the peripheral Fresnel lens 22 and the central axis of the peripheral light source 12, it is helpful to ensure the dispersion effect of the peripheral Fresnel lens 22 on light, thereby ensuring the uniformity and consistency of the final illumination.

[0058] like Figures 1 to 3As shown, a plurality of light sources 10 are arranged at intervals, a plurality of Fresnel lenses 20 are arranged at intervals, and M=N=3, the number of light sources 10 and the number of Fresnel lenses 20 are both 3*3, the distance between a corresponding group of light sources 10 and Fresnel lenses 20 is greater than or equal to 0.1 mm and less than or equal to 0.2 mm, and the overall thickness of the flash device composed of 3*3 light sources 10 and 3*3 Fresnel lenses 20 is less than 2.5 mm.

[0059] like Figure 2 As shown, the light source 10 is an LED. The multiple LEDs in this embodiment are packaged in a planar manner. The angular distribution of the light source 10 is a Lambertian distribution of ±60°, and the wavelength range of the light is 350nm-830nm. The distance between any two adjacent light sources 10 among the multiple light sources 10 is greater than or equal to 0.05mm and less than or equal to 0.08mm. Each light source 10 is rectangular and has an equal luminous area. After the multiple light sources 10 are packaged as a whole, a rectangular structure is formed. The length of each light source 10 is greater than or equal to 0.5mm and less than or equal to 0.7mm, and the width is greater than or equal to 0.4mm and less than or equal to 0.6mm. Although in Figure 2 In the specific embodiment shown, the shapes and sizes of the light sources 10 are all equal, but in practical applications, the multiple light sources 10 are not limited to one size and shape. Meanwhile, the planar packaged LED can be implemented by ceramic packaging or CSP packaging.

[0060] like Figure 2 As shown, 3*3 light sources 10 include a central light source 11 and eight peripheral side light sources 12. The nine light sources 10 can be matched with mobile phone terminals and are suitable for working in different shooting modes. Different working modes use different ways of lighting the light sources 10. When long-distance photography is required, the field angle of the flash device needs to be less than 50°, preferably in a range of greater than or equal to 30° and less than 50°. At this time, only the central light source 11 is lit; when wide-angle photography is required, the field angle of the flash device needs to be greater than or equal to 50° and less than or equal to 85°. At this time, only four peripheral side light sources 12 arranged in a cross are lit, that is, the four peripheral side light sources 12 above, below, left and right of the central light source 11; when ultra-wide-angle photography is required, the field angle of the flash needs to be greater than 85° and less than or equal to 120°. At this time, only eight peripheral side light sources 12 are lit. This setting can selectively light up light sources 10 at different positions according to the field angle of view required for actual shooting, thereby achieving a variable field angle to meet the needs.

[0061] like Figure 3As shown, each Fresnel lens 20 is a whole, and each Fresnel lens 20 includes a convex structure located at the center, and a plurality of nested annular tooth structures, and the plurality of annular tooth structures are arranged concentrically with the convex structure. The Fresnel lens 20 has the effect of shaping and uniforming the light beam, and can greatly shorten the module thickness of the overall lighting system. The size of the Fresnel lens 20 in a corresponding group of Fresnel lenses 20 and the light source 10 is slightly larger than the size of the light source 10, wherein the optical surface 23 of the Fresnel lens 20 is of equal tooth width, that is, the distance between two adjacent annular tooth structures in the plurality of annular tooth structures is equal, and the distance between two adjacent annular tooth structures is greater than or equal to 0.1 mm and less than or equal to 0.2 mm, the thickness of the Fresnel lens 20 is greater than or equal to 0.15 mm and less than or equal to 0.3 mm, the optical surface 23 of the Fresnel lens 20 is located on the side thereof facing the light source 10, and the surface of the side of the Fresnel lens 20 away from the light source 10 is a plane. The single Fresnel lens 20 is square in shape and can be made of optical glass or optical plastic and is manufactured by injection molding.

[0062] refer to Figure 3 In the corresponding peripheral Fresnel lens 22 and peripheral light source 12, the central axis of the peripheral Fresnel lens 22 is located on the side of the central axis of the peripheral light source 12 away from the central light source 11. Under this premise, the peripheral Fresnel lens 22 located above and below the central Fresnel lens 21 moves upward and downward relative to its corresponding peripheral light source 12 by a distance greater than 0 and less than or equal to 0.1 mm, and the peripheral Fresnel lens 22 located on the left and right of the central Fresnel lens 21 moves left and right relative to its corresponding peripheral light source 12 by a distance greater than 0 and less than or equal to 0.15 mm. The peripheral Fresnel lenses 22 at the remaining four corner positions are respectively aligned with the peripheral Fresnel lenses 22 near them, so that the centers of the Fresnel lenses 20 in each row and column of the 3*3 Fresnel lenses 20 are located on the same straight line. When the nine light sources 10 are lit, the light beam changes after passing through the nine Fresnel lenses 20, and the light is redistributed.

[0063] Specifically, when used in conjunction with a mobile phone module, when shooting at a long distance, the central light source 11 is lit, and the shaping of the light beam is mainly based on the central Fresnel lens 21; when shooting in wide-angle mode, only the four peripheral side light sources 12 arranged in a cross are lit, that is, the four peripheral side light sources 12 above, below, left, and right of the central light source 11, and the four peripheral side Fresnel lenses 22 corresponding to the four peripheral side light sources 12 work to shape and homogenize the light beam; when shooting in ultra-wide-angle mode, only eight peripheral side light sources 12 are lit, and the eight peripheral side Fresnel lenses 22 are all involved in the shaping and homogenization of the light beam. Since the peripheral side Fresnel lenses 22 have a certain offset, the overall brightness distribution of the peripheral side light sources 12 is more uniform.

[0064] like Figure 4 As shown, in another example of the present embodiment, each light source 10 is square, and the size and area of ​​each light source 10 are equal, and the side length of the light source 10 is greater than or equal to 0.4 mm and less than or equal to 0.7 mm. The optical element also includes a biconvex lens 30, and the biconvex lenses 30 are M*N, specifically 3*3, and a biconvex lens 30 is arranged between each corresponding group of light sources 10 and the Fresnel lens 20. This arrangement allows the light source 10 to be shaped and converged once through the biconvex lens 30, and then uniformed through the Fresnel lens 20.

[0065] like Figure 5 As shown, in another example of the present embodiment, the shapes of the multiple light sources 10 include multiple shapes of rectangles and squares, the light emitting areas of at least some of the multiple light sources 10 are different, and the multiple light sources 10 form a square structure, and the side length of the square structure is greater than or equal to 1.8 mm and less than or equal to 2.1 mm. It can be seen from the figure that the light emitting area of ​​the central light source 11 is the largest, and the sizes of the four peripheral side light sources 12 above, below, left and right of the central light source 11 are the same, and the sizes of the peripheral side light sources 12 at the four corner positions are the same. After the beam is shaped by the edge-biased peripheral Fresnel lens 22, a light spot with a small difference between the central brightness and the uniform brightness of the edge is obtained.

[0066] Embodiment 2

[0067] like Figures 6 to 13 As shown, a flash device according to the second embodiment of the present application is described.

[0068] In the second embodiment, there is one light source 10, and the optical element includes a variable focus lens 40, which is an adaptive liquid variable focus lens. The liquid variable focus lens is electrically controlled and can seamlessly switch between different curvatures in just milliseconds. When the light emitted by the light source 10 passes through the variable focus lens 40 with different curvatures, the light beam has different divergence angles, thereby providing different field angles to match different lighting light types.

[0069] like Figure 6As shown, it is a schematic diagram of the structure of a flash device of an example of this embodiment. The flash device also includes a circuit substrate 50 and a housing 60. The light source 10 is mounted on the circuit substrate 50. The housing 60 is covered on the circuit substrate 50 and accommodates the light source 10 and the variable focus lens 40 therein. In this embodiment, the change of the field of view angle is achieved by adjusting the variable focus lens 40. The gray area in the figure is the effective area of ​​the variable focus lens 40, that is, the area for the imaging light to pass through. The driving circuit module is omitted, and finally the package is completed by the housing 60. The top of the package is made of high-transmittance material, and the side is made of surface ink-coated or light-shielding material. The flash device is overall centrally symmetrical, and the axis of symmetry is the optical axis 80. The entire flash device is connected to the portable device terminal, and the terminal shooting operation interface 43 displays the flash usage mode. The projection of the variable focus lens 40 on the circuit substrate 50 completely covers the light source 10.

[0070] like Figure 7 As shown, described Figure 6 The flash structure in is a control flow chart. The control process includes two modes: the first mode: the terminal control operation interface 43 can be used to select a suitable flash device to light up. The terminal control generally uses the flash device as a flashlight, which is an emergency device in the wild or when there is a power outage. After the selection result passes through the processor, the current of the variable focus lens 40 in the flash device is adjusted, the variable focus lens 40 starts to focus, and then the light source 10 is lit to achieve lighting; the second mode is to transmit the monitoring data to the processor through the ambient light detection module and the target object shooting focal length detection module, the current of the variable focus lens 40 is adjusted, the variable focus lens 40 starts to focus, and the light source 10 is lit, which can achieve an ideal lighting area for shooting.

[0071] like Figure 8 As shown, it is a schematic diagram of the light source 10 mounted on the circuit board. The light source 10 adopts a planar packaging technology, which can be a ceramic package or a CSP package. The light source 10 ignores components such as circuits and chips. The light source 10 is an LED. Only the upper surface of the light source 10 emits light. The emitted light beam has a certain angle range. Its shape, size and divergence angle are not limited to the special case shown in the figure. According to different application devices, the light source 10 can be added or the initial divergence angle of the light source 10 can be changed, but it is at least a centrally symmetrical light source 10 and a centrally symmetrical divergence angle. In this embodiment, a single light source 10 emits a light beam, the size of the light source 10 is 0.9mm*0.9mm, and the angular distribution is a Lambertian distribution. The luminous color of the luminous part is a desired luminous color such as white. In this embodiment, the wavelength range of the light source 10 is 350nm-830nm.

[0072] like Fig. 9As shown, the effective area of ​​the variable focus lens 40 of this embodiment is connected to the first liquid lens 41 and the second liquid lens 42 in sequence along the direction away from the light source 10. The first liquid lens 41 and the second liquid lens 42 have the same density and different refractive index. There is a spherical interface 43 between the first liquid lens 41 and the second liquid lens 42. The field of view of the flash device can be adjusted by adjusting the radius of curvature of the interface 43. The application of voltage can change the radius of curvature of the interface 43, so that the focal length can be variable or auto-focused, and the optical axis is stable and unchanged. For shooting mode requirements of different FOVs, the variable focus lens 40 can be modulated to the corresponding radius of curvature, and the corresponding optical focal length can be accurately modulated between -5D and 20D. In other words, the optical focal length adjustment range of the variable focus lens 40 is greater than or equal to -5D and less than or equal to 20D. And the aperture of the variable focus lens 40 is larger than the size of the light source 10. Finally, the center of the overall light-emitting surface of the light source 10 is aligned with the optical axis of the variable focus lens 40. In the working mode, when a certain current is applied, the curvature radius of the interface 43 of the liquid variable focus lens 40 changes, and the first light beam emitted by the light source 1001 is modulated into the second light beam after passing through the variable focus lens 40. The first light beam includes the light beam emitted by the light source 10 in multiple FOV modes, and the variable focus lens 40 can change multiple times to modulate the light beam so that the final light beam meets the application requirements.

[0073] In this embodiment, the light source 10 is matched with the variable focus lens 40 for one light distribution, so the variable focus lens 40 with positive focal length is required to adjust the light beam, and the focal length adjustment range is between 0D and 20D. In this embodiment, the overall thickness of the light source 10 and the variable focus lens 40 is greater than or equal to 3mm and less than or equal to 5mm, the spacing between the light source 10 and the Fresnel lens 20 is greater than or equal to 0.1mm and less than or equal to 0.2mm, the gap between the variable focus lens 40 and the top inner layer of the sealing layer of the housing 60 is greater than 0.1mm and less than 0.2mm, and the maximum aperture of the variable focus lens 40 is greater than or equal to 6mm and less than or equal to 8mm, wherein the effective aperture is greater than 2mm and less than 3m.

[0074] refer to FIG. 10A to FIG. 10C , respectively showing the output beam effect diagrams of the flash device in different shooting modes. Fig. 10A As shown, it is a schematic diagram of the flash device corresponding to the first shooting mode (applicable to periscope and telephoto shooting modes). The light source 10 emits a light beam 01b. When the current I1 is applied to the variable focus lens 40, the variable focus lens 40 is instantly deformed. At this time, the radius of curvature of the interface 43 is greater than or equal to 15D and less than or equal to 20D. The light beam 01b is shaped into a light beam 031b after passing through the variable focus lens 40, and the divergence angle changes. At this time, the field of view of the flash device is greater than or equal to 30° and less than or equal to 50°, matching the shooting of 30°≤FOV≤50° in the telephoto mode. Fig. 10BAs shown, it is a schematic diagram of the flash device corresponding to the second shooting mode (applicable to the conventional main shooting mode). Similarly, the light source 10 emits a beam 01b, and the current I2 is applied, and the interface 43 is deformed. At this time, the radius of curvature of the interface 43 is greater than or equal to 7D and less than or equal to 10D. The beam 01b is shaped into a beam 032b through the variable focus lens 40, and the divergence angle changes. At this time, the field of view of the flash device is greater than 50° and less than or equal to 90°, which mainly matches the shooting of the main shooting mode 50°<FOV≤90°. Fig. 10C As shown, it is a schematic diagram of the flash device of the third shooting mode (suitable for wide-angle and ultra-wide-angle modes). Similarly, the light source 10 emits a light beam 01b, applies a current I3 to the variable focus lens 40, and the liquid-liquid spherical interface 43 is deformed. At this time, the radius of curvature of the variable focus lens 40 is greater than or equal to 0D and less than or equal to 3D. The light beam 01b is shaped into a light beam 033b through the variable focus lens 40, and the divergence angle changes less. At this time, the field of view of the flash device is greater than 90° and less than or equal to 120°, matching the wide-angle 90°<FOV≤120° shooting mode. The FOV change is not limited to the angle range of these three modes, and can be appropriately adjusted in a targeted manner. Except for the circuit, processor, circuit substrate 50, etc., for the corresponding devices in all possible shooting modes, the center of the exit surface of the light source 10 and the optical axis 80 of the corresponding variable focus lens 40 are all aligned, and the lighting position of the light source 10 does not change.

[0075] Specifically, the flash device with variable FOV can be used with a mobile phone terminal and is suitable for working in different shooting modes. Different working modes use a variable focus lens 40 with different curvature radii. Figures 11A-11C It is a side view of the final emitted light beam when the flash device is working. When the shooting target is far away from the camera, more than 2.5m, and the field of view angle is in the range of 30°-50°, the flash will light up area 6a, such as Fig.11A ; When the object is close to the camera, about 1.5m-2m away, the field of view reaches 50°-90°, such as Fig. 11B The flash device will light up area 6b; when the shooting target is no more than 1m away from the camera, the field of view reaches 90°-120°, and the flash device will light up area 6c. Fig. 11C .

[0076] like Fig.12As shown, since the focal length of the variable focus lens 40 is limited, in another example of the present embodiment, the optical element further includes a biconcave lens 70, and the biconcave lens 70 is located on the side of the variable focus lens 40 away from the light source 10. The optical element is composed of a variable focus lens 40 and a biconcave lens 70. Similarly, the optical axes of the light source 10, the variable focus lens 40 and the biconcave lens 70 coincide. The aperture of the biconcave lens 70 is larger than the effective aperture of the variable focus lens 40. The light beam emitted by the light source 10 is shaped for the first time by the variable focus lens 40, and then shaped for the second time by a biconcave lens 70, and finally a light beam with a desired field of view angle is emitted, as shown in FIG. Fig.12 . This example is also suitable for providing different lighting areas for different shooting modes, depending on the different currents applied to the variable focus lens 40. The distance between the light source 10 and the variable focus lens 40 is greater than or equal to 0.1 mm and less than 0.2 mm, the spacing between the variable focus lens 40 and the biconcave lens 70 is greater than or equal to 0.1 mm and less than 0.5 mm, and the gap between the biconcave lens 70 and the top inner layer of the sealing layer is greater than 0.1 mm and less than 0.2 mm. This arrangement enables the flash device composed of the light source 10, the variable focus lens 40, and the biconcave lens 70 to not only achieve a variable FOV but also ensure the compactness of the structure and meet the requirements of miniaturization.

[0077] like Fig.13 As shown, in another example of this embodiment, the optical element further includes a Fresnel lens 20, which is located on a side of the variable focus lens 40 away from the light source 10, and a surface of the Fresnel lens 20 facing the light source 10 is an optical surface 23. Fig.13In the specific example shown, the optical element is composed of a variable focus lens 40 and a Fresnel lens 20. The Fresnel lens 20 is circular, and the material can be selected from optical glass or optical plastic, and is processed and manufactured by injection molding. The Fresnel lens 20 has the effect of shaping and uniforming the light beam, and can greatly shorten the module thickness of the overall flash device. The size of the Fresnel lens 20 is slightly larger than the effective aperture of the variable focus lens 40, and the surface of the Fresnel lens 20 away from the variable focus lens 40 is a plane. The top sealing layer of the flash device is replaced by the Fresnel lens 20, and the upper plane of the Fresnel lens 20 is the sealing layer. The Fresnel lens 20 is not limited to the number of focal lengths, and can be different ring bands or the same ring band; the Fresnel lens 20 is one or more. When the Fresnel lens 20 is multiple, the multiple Fresnel lenses 20 are arranged in a rectangular array, and the multiple Fresnel lenses 20 can be a 2×2 array or a 3×3 array. The distance between the Fresnel lens 20 and the variable focus lens 40 is greater than 0.1 mm and less than 0.5 mm. The center of the Fresnel lens 20, the center of the variable focus lens 40, and the center of the light source 10 are aligned. After passing through the variable focus lens 40, the light emitted by the light source 10 is shaped for the first time, and then passed through the Fresnel lens 20 for homogenization processing, so as to be uniform and have a required FOV light beam.

[0078] Specifically, the variable focus lens 40 can respond quickly by applying current, changing the radius of curvature of the interface 43 to achieve light beam shaping without the need for moving mechanical parts. It has the characteristics of small size, fast response, low cost and high integration, which is conducive to the miniaturization and lightweight of flash devices with variable FOV, and can be used in portable devices such as mobile phones and cameras.

[0079] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flash device, characterized in that: include: Light source (10); An optical element is located on the light-emitting side of the light source (10), and is used to shape the light emitted by the light source (10). The field of view angle of the flash device is adjusted by adjusting the light source (10) or the optical element, and the maximum irradiation angle of the flash device is 4 times the minimum irradiation angle.

2. The flash device according to claim 1, characterized in that There are one or more light sources (10). When there are more than one light source (10), the plurality of light sources (10) are composed of M*N light sources (10), where M is equal to or not equal to N.

3. The flash device according to claim 1, characterized in that The optical element is one or more of a Fresnel lens (20), a biconvex lens (30), a variable focus lens (40), and a biconcave lens (70).

4. The flash device according to claim 1, characterized in that The light sources (10) are multiple and are independently arranged. The plurality of light sources (10) are composed of M*N light sources (10), the optical element comprises a Fresnel lens (20), the number of the Fresnel lenses (20) is M*N, each of the light sources (10) corresponds to one Fresnel lens (20), M is equal to N, and the size of the field of view angle of the flash device is selected by adjusting the brightness of the plurality of light sources (10).

5. The flash device according to claim 4, characterized in that The M*N light sources (10) include a central light source (11) and a plurality of peripheral light sources (12); the M*N Fresnel lenses (20) include a central Fresnel lens (21) and a plurality of peripheral Fresnel lenses (22); the central axis of the central light source (11) coincides with the central axis of the central Fresnel lens (21); the central axis of each peripheral light source (12) does not coincide with the central axis of its corresponding peripheral Fresnel lens (22); and in the corresponding peripheral Fresnel lens (22) and peripheral light source (12), the central axis of the peripheral Fresnel lens (22) is located on a side of the central axis of the peripheral light source (12) away from the central light source (11).

6. The flash device according to claim 5, characterized in that In the corresponding peripheral Fresnel lens (22) and the peripheral light source (12), the distance between the central axis of the peripheral Fresnel lens (22) and the central axis of the peripheral light source (12) is greater than 0 mm and less than or equal to 0.15 mm.

7. The flash device according to claim 5, characterized in that The plurality of light sources (10) are arranged at intervals, the plurality of Fresnel lenses (20) are arranged at intervals, and M=N=3, the 3*3 light sources (10) include one central light source (11) and eight peripheral side light sources (12), Only the central light source (11) is lit, and the field angle of the flash device is less than 50°; Only the four peripheral side light sources (12) arranged in a cross are lit, and at this time the field angle of the flash device is greater than or equal to 50° and less than or equal to 85°; Only eight of the peripheral side light sources (12) are lit, and at this time, the field of view angle of the flash lamp is greater than 85° and less than or equal to 120°.

8. The flash device according to claim 4, characterized in that Each of the light sources (10) is rectangular and has an equal light-emitting area, and the plurality of light sources (10) form a rectangular structure; or the shapes of the plurality of light sources (10) include a plurality of rectangles and squares, at least some of the plurality of light sources (10) have different light-emitting areas, and the plurality of light sources (10) form a square structure.

9. The flash device according to claim 4, characterized in that The optical element further comprises a biconvex lens (30), wherein the number of the biconvex lenses (30) is M*N, and one biconvex lens (30) is arranged between each corresponding group of the light sources (10) and the Fresnel lens (20).

10. The flash device according to claim 4, characterized in that The distance between a corresponding group of the light sources (10) and the Fresnel lens (20) is greater than or equal to 0.1 mm and less than or equal to 0.2 mm; and / or The overall thickness of the flash device is less than 2.5 mm.

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