A camera module with fill light function

Abstract

The present invention relates to a camera module with a fill light function, the camera module with a fill light function comprising a lens (1), two fill light lamps (2) located on the left and right sides of the lens (1) and symmetrically arranged about the central optical axis of the lens (1), and the central light beams of the fill light lamps (2) are arranged obliquely with respect to the central optical axis of the lens (1). The camera module with a fill light function of the present invention solves the problem in the prior art that light cannot reach the edge of a chip, resulting in poor imaging quality.

Description

Technical Field

[0001] The present invention relates to the field of optical devices, and in particular to a camera module with a fill light function. Background Art

[0002] Just as the popularity of smart phones has disrupted the mobile phone industry, cars, as a major means of transportation for people, are increasingly influencing and changing people's lives. Concepts such as active safety and driverless driving are receiving more and more attention from people. With the emergence of relevant industry laws and regulations, car cameras will inevitably become one of the important tools for realizing car intelligence.

[0003] The in-cabin camera can monitor the driver and passengers, realize face recognition, fatigue driving monitoring, passenger behavior monitoring, etc. Due to the lack of light in the car, especially at night, the camera cannot effectively identify the people in the car, so additional light-emitting devices are needed to supplement the shooting range.

[0004] Since the human eye is more sensitive to visible light, and strong visible light reflected in the cabin can easily affect the driver's normal driving. Therefore, common fill light components mainly use infrared LEDs or VXSELs. However, the light intensity distribution of conventional lighting LEDs is generally circular. When the light enters the lens, due to the difference in magnification of different markets, the light will not reach the edge of the chip, thereby reducing the overall brightness of the edge of the picture and affecting the image quality. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problem and provide a camera module with fill light function to solve the problem in the prior art that light cannot reach the edge of the chip resulting in poor imaging quality.

[0006] To achieve the above objectives, the present invention provides a camera module with a fill light function, comprising a lens, and two fill lights located on the left and right sides of the lens and symmetrically arranged about the central optical axis of the lens, wherein the central light beam of the fill light is inclined to the central optical axis of the lens.

[0007] According to one aspect of the present invention, the inclination angle range between the central light beam of the fill light and the central optical axis of the lens is 25°-45°.

[0008] According to one aspect of the present invention, the light intensity distributions of the two fill lights are trapezoidal or fan-shaped, and the light intensity distributions of the two fill lights have overlapping portions.

[0009] According to one aspect of the present invention, the fill light is an LED light.

[0010] In the camera module with fill light function of the present invention, the center beam of the fill light is tilted with the center optical axis of the lens, so that the light intensity distribution of the two fill lights changes from strong in the center and weak at the edge to trapezoidal and fan-shaped, improving the light intensity distribution, which is beneficial to the fill light of the camera module. When the fill light fills the lens, by adjusting the tilt angle between the center beam of the fill light and the center optical axis of the lens, the light intensity distribution of the two fill lights overlaps to form a pillow shape, such as Figure 7 As shown, the fill light can be evenly distributed around the chip, which can effectively improve the fill light effect, reduce light energy loss and heat loss, thereby improving the photoelectric conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram showing the structure of a camera module with a fill light function according to the present invention;

[0012] Figure 2 Schematic representation Figure 1 Light intensity distribution diagram of the fill light on the left side of the center;

[0013] Figure 3 Schematic representation Figure 1 Light intensity distribution diagram of the fill light on the middle right;

[0014] Figure 4 An overlapping diagram schematically showing the distribution of fill light intensity on the left and right sides;

[0015] Figure 5 Schematically showing a diagram without TV distortion;

[0016] Figure 6 Schematically showing TV distortion diagram;

[0017] Figure 7 Schematically represents an inverse TV distortion diagram. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0020] like Figure 1As shown, the present invention provides a camera module with a fill light function, comprising a lens 1, two fill light lamps 2 symmetrically arranged on the left and right sides of the lens 1 about the central optical axis of the lens 1, the central light beams of the fill light lamps 2 being arranged obliquely to the central optical axis of the lens 1, and the fill light lamps 2 can be LED lamps. Such an arrangement can change the light intensity distribution of the two fill light lamps 2 from being strong at the center and weak at the edges to a trapezoidal and fan-shaped shape, thereby improving the light intensity distribution and facilitating the fill light of the camera module.

[0021] In the present invention, the tilt angle range of the central light beam of the fill light 2 and the central optical axis of the lens 1 is 25°-45°. Generally speaking, the greater the distortion of the lens itself, the greater the tilt angle of the corresponding LED needs to be. Figure 2-Figure 4 As shown, the light intensity distributions of the two fill lights 2 are trapezoidal or fan-shaped, and the light intensity distributions of the two fill lights 2 have overlapping parts.

[0022] In this way, when the fill light 2 is filling light for the lens 1, by adjusting the tilt angle between the center beam of the fill light and the center optical axis of the lens 1, the light intensity distributions of the two fill lights 2 overlap to form a pillow shape, such as Figure 7 As shown, the fill light can be evenly distributed around the chip, which can effectively improve the fill light effect, reduce light energy loss and heat loss, thereby improving the photoelectric conversion efficiency.

[0023] by Figure 5 For example, when the lens field of view is large, due to the different magnifications under different fields of view, more serious image deformation will occur at the position with a larger field of view, that is, TV distortion. Wide-angle modules generally have negative TV distortion, and rectangular graphics ( Figure 5 ) After the model is formed, it appears as a pincushion distortion, such as Figure 6 If the original graph is similar to the graph after two sectors are superimposed, such as Figure 7 As shown, it can be formed into a normal rectangular image, such as Figure 5 shown.

[0024] When the LED light is used to fill in the lens, if the light intensity distribution is circular or rectangular, the light intensity around the chip will be reduced to zero when the image is formed on the module chip. Figure 7 As shown, when imaging on the module chip, the light of the LED lamp can be evenly distributed around the chip.

[0025] Rotate the angles of the two LED lights to make the overall light intensity distribution ( Figure 4 ) as close as possible Figure 7 The shape shown will achieve the ideal effect.

[0026] The above is only one 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 camera module with fill light function, characterized in that: The invention comprises a lens (1), and two fill-in lights (2) located on the left and right sides of the lens (1) and symmetrically arranged about the central optical axis of the lens (1); the central light beams of the fill-in lights (2) are arranged to be inclined with respect to the central optical axis of the lens (1); the central light beams of the fill-in lights (2) are inclined with respect to the central optical axis of the lens (1) at an angle ranging from 25° to 45°; the light intensity distributions of the two fill-in lights (2) overlap to form a pillow shape, so that the fill-in lights can be evenly distributed around the chip of the camera module; The light intensity distribution of the two fill lights (2) is trapezoidal or fan-shaped.

2. The camera module with fill light function according to claim 1, characterized in that: The fill light (2) is an LED light.

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