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Design method of flashlight lens with quasi-rectangular spot

A technology of rectangular spot and lens design, which is applied in the direction of lenses, semiconductor devices of light-emitting elements, optics, etc., can solve the problem of low utilization rate of flash light energy, achieve the effect of reducing energy loss and improving utilization rate

Active Publication Date: 2019-06-11
YEJIA OPTICAL TECH GUANGDONG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing flashlight lenses include one or more LED chips, and are equipped with round or square lenses. The lenses generally use Fresnel lenses, and the corresponding lines on a single LED are basically circular Fresnel lines. , the finally formed lighting spots are all close to circular symmetrical spots, while most of the photos and images taken by mobile phones are rectangular images. figure 1 As shown, the illumination range of the flash is larger than the field of view of the camera, resulting in low light energy utilization efficiency of the flash

Method used

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  • Design method of flashlight lens with quasi-rectangular spot
  • Design method of flashlight lens with quasi-rectangular spot
  • Design method of flashlight lens with quasi-rectangular spot

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Embodiment 1

[0034] Embodiment 1, the flashlight lens is designed by the method of the present invention, the flashlight lens is set as a Fresnel lens, the incident surface is a concave-convex surface provided with Fresnel lines, the outgoing surface is a smooth plane, and two groups of phenanthrene lenses are set in the incident surface. Neel texture, take the center of the entire lens as the center, take a circular plane, and set a plane Cartesian coordinate system x-y on the plane, the origin of the plane Cartesian coordinate system x-y coincides with the center point of the lens, and combine two groups of Fresnel The textures are respectively set on the left and right sides of the y-axis. Along the x-axis or the y-axis, the Fresnel textures in the lens are in an axisymmetric relationship; take the Fresnel texture groups in the first and fourth quadrants of the plane Cartesian coordinate system x-y, The Fresnel pattern passed by the x-axis is a, and the Fresnel pattern passed by the y-ax...

Embodiment 2

[0035] Embodiment 2, the flashlight lens is designed by the method of the present invention, the flashlight lens is set as a Fresnel lens, the incident surface is a concave-convex surface provided with Fresnel lines, the outgoing surface is a smooth plane, and a group of Fresnel lenses is set in the incident surface. Neil pattern, take the center point of the entire lens as the origin, take a circular plane, and set the plane Cartesian coordinate system x-y on the plane, the origin of the plane Cartesian coordinate system x-y coincides with the center point of the lens, and set the Fresnel pattern It is a group of concentric ellipses. The center point of the concentric ellipse coincides with the center point of the lens. The two focal points of the concentric ellipse are located on the x-axis. Along the x-axis or y-axis, the Fresnel lines in the lens are axisymmetric. Relationship; the Fresnel pattern that the x-axis passes through is a, the Fresnel pattern that the y-axis pass...

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Abstract

The invention provides a quasi-rectangular light spot type flashlight lens design method. The method includes the steps of setting a lens as a Fresnel lens, wherein an incident plane is provided with n groups of Fresnel fringes, n is not less than 1, and an emergent plane is smooth; taking a plane space in rotational symmetry on the incident plane, and setting a rectangular plane coordinate system x-y on the plane space in rotational symmetry, wherein the Fresnel fringes form an axial symmetry relation along an x axis or y axis; taking a group of Fresnel fringes, making a Fresnel fringes pass through in the x-axis direction in the plane space in rotational symmetry, and making b Fresnel fringes pass through in the y-axis direction in the plane space in rotational symmetry, wherein a is more than 1, b is more than 1, a and b are both integers and a does not equal b. The quasi-rectangular light spot type flashlight lens design method has the advantage that the fringes of a flashlight lens designed by the method are in non-rotational symmetry, and formed light spots are compressed or stretched in one dimensionality and can match with a rectangular view field of cell phone shooting, so that energy utilization rate can be increased effectively.

Description

technical field [0001] The invention relates to the field of flashlight lenses, and specifically discloses a design method for a flashlight lens with a rectangular spot. Background technique [0002] LED has high luminous efficiency, low power consumption, long service life, and safety. It is an environmentally friendly and reliable light source, and is widely used in various display lighting fields. The mobile phone is an indispensable tool in modern life. It integrates various functions, one of which is the camera function. Taking pictures in an environment with insufficient light requires the cooperation of a flash. The flash of a mobile phone is generally used with an LED chip and a lens. [0003] Existing flashlight lenses include one or more LED chips, and are equipped with circular or square lenses. The lenses generally use Fresnel lenses, and the corresponding lines on a single LED are basically circular Fresnel lines. , the final lighting spots are all close to cir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/08F21K9/69F21V5/04F21Y115/10
CPCF21V5/006F21V5/045
Inventor 江程佘俊南基学
Owner YEJIA OPTICAL TECH GUANGDONG CORP