Optical system for five-piece vehicle-mounted projection lamp
A lighting technology, five-piece technology, applied in the field of optics, can solve the problems of small patterns and inconvenient viewing, and achieve the effects of easy viewing, increased projection screen, and increased projection angle.
Inactive Publication Date: 2019-11-26
ZHEJIANG LANTE OPTICS
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Problems solved by technology
However, the patterns formed by the vehicle-mounted projection equipment projected in a short distance are small, which is not convenient for users to watch
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[0029] Specific embodiments of the present invention will be further described in detail below. It should be understood that the description of the embodiments of the present invention here is not intended to limit the protection scope of the present invention.
[0030] like Figure 1 to Figure 2 As shown, it is a schematic structural diagram of the five-chip vehicle-mounted projection light optical system provided by the present invention. The five-piece vehicle-mounted projection light optical system includes a projection film 1 as the object space for outputting images, a projection area 2 as the image side, a lens group 10, and one is arranged in the lens group 10 and uses A diaphragm 20 for limiting the aperture size of the imaging beam, and a cover glass 30 arranged between the lens group 10 and the projection film 1 . The five-chip vehicle projection light optical system also includes other functional modules, such as assembly components, electrical components, etc., ...
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Provided in the invention is an optical system for a five-piece vehicle-mounted projection lamp. The optical system comprises a projection film that is used for outputting an image and serves as an object side, a projection region as an image side, a lens group, and a diaphragm. The lens group includes five lenses including a first lens with the negative focal power, a second lens with positive focal power, a third lens with the positive focal power, a fourth lens with the negative focal power, and a fifth lens with the positive focal power, wherein the lenses are arranged successively from the image side to the object side. The first lens and the third lens are aspherical lenses. The lens group needs to meet relational expressions: f3 is less than 3 and is larger than f that is larger than 1.2 and f2 is less than 6.5 and is larger than f3 that is larger than 2.5, wherein the f expresses the focal length of the whole lens group, the f2 expresses the focal length of the second lens, andthe f3 expresses the focal length of the third lens. According to the optical system, with the lens group, a 3.5-m projection effect that is displayed without the lens group can be projected at the distance of 1m, so that the projection angle is increased and the projection picture is increased and thus the user can observe the picture conveniently.
Description
technical field [0001] The invention belongs to the field of optical technology, in particular to a five-chip vehicle projection light optical system. Background technique [0002] With the improvement of living standards, the number of motor vehicles is also increasing. Every household basically has a vehicle. The tool for people to travel has gradually become a car. The travel of the car has brought great convenience to people's life. It not only saves people's time, but also reduces the burden of people's travel. [0003] At present, in order to increase the driving pleasure of the car, many drivers install on-board projection lights on the vehicle. The car projection lamp uses LED light source, directly adds lens structure and projection film to form the optical system of the entire projection lamp, and then projects it to the ground to form a pattern. However, the patterns formed by the vehicle-mounted projection equipment projected in a short distance are small, whic...
Claims
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Login to View More IPC IPC(8): G02B13/18G02B1/00
CPCG02B1/00G02B13/18
Inventor 徐云明
Owner ZHEJIANG LANTE OPTICS