CN210241461U

CN210241461U - Flash lamp lens and flash lamp module

Info

Publication number: CN210241461U
Application number: CN201921088682.0U
Authority: CN
Inventors: Bijun Li; 李碧君
Original assignee: Pulse Optical Co ltd
Current assignee: Pulse Optical Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-04-03
Anticipated expiration: 2029-07-11

Abstract

The utility model discloses a flash lamp lens and flash lamp module, include: a lens body; the top surface of the lens body is a light-emitting surface; the light-emitting surface is a plane; an arc convex surface is arranged at the center of the bottom surface of the lens body; tooth-shaped surfaces are arranged on two sides of the convex surface and are symmetrical about a central optical axis of the lens body; the convex surface and the tooth-shaped surface are light incident surfaces; the tooth profile is characterized in that in the tooth profile surface on one side of the convex surface, the height of teeth of the tooth profile surface is reduced from inside to outside in sequence. The utility model provides a technical scheme can improve central illuminance value when improving light-emitting efficiency.

Description

Flash lamp lens and flash lamp module

Technical Field

The utility model belongs to the technical field of optical device, especially, relate to a flash light lens and flash light module.

Background

At present, a flash lamp module is basically configured in a smart phone, and specifically comprises an LED light source and a flash lamp lens, wherein a certain gap is formed between the LED light source and the flash lamp lens. When shooing under the darker environment of light, the flash light module plays the light filling effect, and in addition, the flash light module still can be used as the flashlight.

Fig. 1 is a schematic structural diagram and a light path diagram of a conventional flash module. In fig. 1, after light emitted from the LED reaches the lens of the flash lamp, a part of the light is refracted by the convex surface at the center of the lens and then exits from the light exit surface at the top; part of light is reflected by the Fresnel teeth distributed on the two sides of the convex surface and then is emitted from the light emitting surface on the top; and after some light is transmitted through the lens, part of the light cannot be emitted from the light-emitting surface and reaches other parts of the lens, so that the light cannot be effectively utilized. The structure of the existing flash lamp lens enables more light rays which cannot be effectively utilized, so that the overall light emitting efficiency of the flash lamp lens is low; the light of the LED light source is distributed unevenly by the existing flash lamp lens, so that the central illuminance value of emergent light is lower on a detection surface at a certain distance.

Disclosure of Invention

The utility model aims at providing a flash light lens and flash light module can improve central illuminance value when improving luminous efficiency.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a flash lamp lens, include: a lens body; the top surface of the lens body is a light-emitting surface; the light-emitting surface is a plane; an arc convex surface is arranged at the center of the bottom surface of the lens body; tooth-shaped surfaces are arranged on two sides of the convex surface and are symmetrical about a central optical axis of the lens body; the convex surface and the tooth-shaped surface are light incident surfaces; the tooth profile is characterized in that in the tooth profile surface on one side of the convex surface, the height of teeth of the tooth profile surface is reduced from inside to outside in sequence.

Further, in the tooth-shaped surface on the convex surface side, the heights of the teeth of the tooth-shaped surface are sequentially reduced from inside to outside according to an arithmetic progression.

Further, each tooth of the toothed surface has an equal length.

Preferably, each tooth of the toothed surface has a length of 0.3 mm; the tolerance of the arithmetic progression is 0.03 mm.

A flash module, comprising: the flash lens of any of the above, an LED light source; the LED light source is positioned right below the flash lamp lens; the distance between the light-emitting surface of the LED light source and the tooth tip of the tooth with the highest tooth-shaped surface is 0.3-0.8 mm.

The utility model provides a flash lamp lens improves the income plain noodles of current flash lamp lens, and the tooth that is located same high tooth profile originally is changed into the echelonment tooth profile that highly from interior to exterior reduces in proper order. Because the light interception effect of the inner teeth of the stepped tooth-shaped surface on light is weakened, incident light is uniformly distributed on the tooth-shaped surface, most of the incident light can be effectively utilized, and the integral light extraction efficiency of the lens can be improved; the improved tooth profile surface enables the whole lens body to be thinned, the light distribution angle of the lens body to be reduced, and light can be concentrated in the tooth profile surface, so that the central illumination value of the lens can be effectively improved. It is visible, the utility model provides a technical scheme can improve central illuminance value when improving light-emitting efficiency.

Drawings

Fig. 1 is a schematic structural diagram and a schematic optical path diagram of a conventional flash module;

fig. 2 is a schematic structural diagram of an embodiment of the present invention;

fig. 3 is a schematic diagram of an optical path according to an embodiment of the present invention;

FIG. 4 is a schematic view of the height distribution of the teeth on the tooth profile surface according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating the effect of the light path of a conventional flash module;

fig. 6 is a diagram illustrating the optical path effect of the embodiment of the present invention;

FIG. 7 is a diagram of the flare effect of a conventional flash module;

fig. 8 is a light spot effect diagram according to an embodiment of the present invention;

in the figure: : 1 is the lens body, 2 is the LED light source, 11 is the top surface of lens body, 12 is the convex surface, and 13 is the tooth profile.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention, including: a lens body 1; the top surface 11 of the lens body 1 is a light-emitting surface; the light-emitting surface is a plane; an arc convex surface 12 is arranged at the center of the bottom surface of the lens body 1; tooth-shaped surfaces 13 are arranged on two sides of the convex surface 12, and the tooth-shaped surfaces 13 are symmetrical about the central optical axis of the lens body 1; the convex surface 12 and the tooth-shaped surface 13 are light incident surfaces; in the tooth profile surface 13 on the convex surface 12 side, the height of the teeth of the tooth profile surface 13 is reduced from inside to outside in sequence, so that the light interception effect of the inner teeth on incident light is reduced.

In this embodiment, in the tooth-shaped surface 13 on the convex surface 12 side, the heights of the teeth of the tooth-shaped surface 13 are sequentially reduced from inside to outside according to the arithmetic progression, so that the light is more uniformly distributed on the light incident surface.

In this embodiment, the length of each tooth of the tooth-shaped surface 13 is equal, and the length of each tooth of the tooth-shaped surface 13 is 0.3 mm; the tolerance of the arithmetic progression is 0.03mm, that is, the height difference between two adjacent teeth is 0.03mm, as shown in fig. 4.

The utility model discloses still disclose a flash light module, include: the strobe lens, the LED light source 2; the LED light source 2 is positioned right below the flash lamp lens; the distance between the light-emitting surface of the LED light source 2 and the tooth tip of the tooth with the highest tooth-shaped surface 13 is 0.3-0.8 mm. It should be noted that the "tooth tip" in the present embodiment refers to the bottom of the tooth in fig. 2, 3, and 4, i.e., the portion near the LED light source. The distance between the light-emitting surface of the LED light source 2 and the tooth tip of the tooth with the highest tooth surface 13 (i.e. the tooth closest to the convex surface) is also referred to as gap value. When the tooth surface 13 is modified to have a step shape, the entire lens body becomes thinner, which corresponds to an increase in the gap value. The increase of the gap value can reduce the light distribution angle of the lens body, concentrate the light rays in the tooth-shaped surface and further improve the central illumination value of the lens.

As shown in fig. 7 and 8, fig. 7 shows a light spot effect formed by the conventional flash module at a distance of about 1m from the LED light source after the LED light source is turned on; fig. 8 shows the flare effect of the flash module of this embodiment formed at a distance of about 1m from the LED light source after the LED light source is turned on. The two conditions are the same except that the arrangement of the teeth of the tooth-shaped surface is different. It is evident that the light spot of fig. 8 is brighter and the light is more concentrated, i.e. the central illuminance value is higher.

As can also be seen from fig. 5 and 6, for the lens with the tooth-shaped surface in the step shape in fig. 6, after the light passes through the lens, the intersection point of the light is further back, the range angle irradiated by the light is smaller, that is, the light is closer to the center position of the lens, and the central illuminance value is higher. And for the lens of figure 5 in the same height of tooth profile, because there is not the difference in height between each prong, the tooth that is close to the lens center is in the place nearer from the light source, intercepts light for the light that divides on the outside tooth is less, does not have even, consequently can cause the beam split uneven, leads to the luminous efficacy and the central illumination value of lens all not high.

Of course, the present invention may have other embodiments, and those skilled in the art may make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.

Claims

1. A flash lens, comprising: a lens body (1); the top surface (11) of the lens body (1) is a light-emitting surface; the light-emitting surface is a plane; an arc convex surface (12) is arranged at the center of the bottom surface of the lens body (1); tooth-shaped surfaces (13) are arranged on two sides of the convex surface (12), and the tooth-shaped surfaces (13) are symmetrical about a central optical axis of the lens body (1); the convex surface (12) and the tooth-shaped surface (13) are light incident surfaces; the tooth profile is characterized in that in the tooth profile (13) on one side of the convex surface (12), the height of teeth of the tooth profile (13) is reduced from inside to outside in sequence.

2. The flash lens according to claim 1, wherein in the tooth-shaped surface (13) on the convex surface (12) side, the heights of the teeth of the tooth-shaped surface (13) decrease in order of an arithmetic progression from inside to outside.

3. The flash lens of claim 2 wherein each tooth of the toothed surface (13) is of equal length.

4. A flash lens according to claim 3, wherein each tooth of the toothed surface (13) has a length of 0.3 mm: the tolerance of the arithmetic progression is 0.03 mm.

5. A flash module, comprising: the flash lens of any one of claims 1 to 4, the LED light source (2); the LED light source (2) is positioned right below the flash lamp lens; the distance between the light-emitting surface of the LED light source (2) and the tooth tip of the tooth with the highest tooth profile (13) is 0.3-0.8 mm.