CN219588788U

CN219588788U - Large-angle zoom lens assembly and laser lighting equipment thereof

Info

Publication number: CN219588788U
Application number: CN202320268673.XU
Authority: CN
Inventors: 邹志新; 范颖超; 李晓春
Original assignee: Changsha Lubang Photoelectric Technology Co ltd
Current assignee: Changsha Lubang Photoelectric Technology Co ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-08-25
Anticipated expiration: 2033-02-21

Abstract

The utility model provides a large-angle zoom lens assembly which comprises a collimating lens group, a liquid crystal homogenizing sheet, a zoom moving lens group and a zoom fixed lens group, wherein the collimating lens group, the liquid crystal homogenizing sheet, the zoom moving lens group and the zoom fixed lens group are sequentially arranged. The utility model also provides laser lighting equipment, which comprises a laser transmitter module, a large-angle zoom lens assembly and a shell for installing the laser transmitter module and the large-angle zoom lens assembly, wherein the large-angle zoom lens assembly comprises a collimation lens group, a liquid crystal homogenizing sheet, a zoom movable lens group and a zoom fixed lens group which are sequentially arranged. By adopting the laser lighting device of the lens component, dynamic targets can be tracked at night, laser speckles can be obviously restrained, the light supplementing image collected by the camera is finer and smoother, and emergent light spots are projected to a far field more uniformly.

Description

Large-angle zoom lens assembly and laser lighting equipment thereof

Technical Field

The utility model belongs to the technical field of laser illumination, and particularly relates to a large-angle zoom lens assembly and laser illumination equipment thereof.

Background

The disclosure of this background section is only intended to increase the understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.

In the current social life, occasions requiring illumination and light supplement are very many, such as traffic law violation monitoring, vehicle-mounted systems, security departments, pastures, farms, orchards, prisons, frontier defense, forest fire prevention, oilfield oil reservoirs, large factories, ecological protection areas, energy mining, water conservancy power, airport ports, administrative law enforcement, fishery and sea surveillance and other places needing night monitoring are required to be illuminated and light supplement.

The floodlight source comprises various bulbs including LEDs and the like, and the floodlight source cannot carry out long-distance transmission due to large luminous surface and large luminous angle and is generally applied to occasions with shorter illumination distance. The laser illumination is performed by using a laser light source, and is specifically divided into visible laser illumination and infrared laser illumination. In the existing laser illumination technology, the following problems exist: 1. because of the coherence property of laser, the laser is directly projected to an object to be illuminated to generate serious speckles, so that an object image shot by an infrared night vision lens presents stronger granular sensation, and the image quality is not fine enough; 2. as the general laser illumination light spot is Gaussian, the energy is strong in the middle and weak in the edge, and the resolution capability of object details is poor; 3. the night vision camera target surface is almost rectangular, the illumination light spot is circular, and if the illumination light spot is used for imaging illumination without shaping, a great part of energy is wasted; 4. most of the lighting devices in the market are fixed-focus light supplementing lenses, and only can illuminate objects at specific distances, so that moving objects cannot be tracked dynamically.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model provides a wide-angle variable focus lens package and a laser lighting device employing the same,

the technical purpose of the utility model is achieved by the following technical scheme.

A wide angle variable focus lens package comprising:

a collimating lens group for collimating the light beam;

the liquid crystal homogenizing chip is used for differentiating the light field of the incident laser;

the zoom mobile lens group is used for integrating and superposing the light field differentiated by the liquid crystal homogenizing sheet, and the light field subjected to integral superposition is uniform in all directions;

a zoom fixed lens group;

the collimating lens group, the liquid crystal homogenizing sheet, the zooming movable lens group and the zooming fixed lens group are sequentially arranged. .

The utility model also provides laser lighting equipment, which comprises a laser transmitter module, a large-angle zoom lens assembly and a shell for installing the laser transmitter module and the large-angle zoom lens assembly, wherein the large-angle zoom lens assembly comprises a collimation lens group, a liquid crystal homogenizing sheet, a zoom movable lens group and a zoom fixed lens group which are sequentially arranged.

Further describing the above technical solution, the laser transmitter module includes a VCSEL (vertical cavity surface emitting laser) chip, and the VCSEL chip is disposed at a rear end of the housing.

Further describing the technical scheme, a collimating lens barrel is arranged in the shell, the collimating lens barrel is arranged in front of the VCSEL chip, the collimating lens group is arranged in the collimating lens barrel, and the front focal plane of the collimating lens group is positioned on the light emitting surface of the VCSEL chip and is used for collimating laser beams.

Further describing the above technical solution, the liquid crystal homogenizing sheet is also disposed on the collimating lens barrel.

Further describing the above technical solution, a zoom lens holder and an exit lens barrel are disposed in the housing, the zoom lens holder and the exit lens barrel are sequentially disposed in front of the collimating lens barrel, the zoom movable lens group is mounted on the zoom lens holder and electrically connected with a micro motor, and the zoom fixed lens group is mounted on the exit lens barrel.

Further describing the technical scheme, the zoom lens frame is provided with a limiter of the miniature motor, and the limiter comprises a baffle and a photoelectric limit switch.

Further describing the above technical solution, the laser lighting device further includes a driving circuit board, where the driving circuit board is electrically connected to the VCSEL chip and the micro-motor.

Further describing the above technical solution, a heat spreader is disposed on the housing, and the heat spreader is located behind and proximate to the VCSEL chip.

Further describing the technical scheme, the shell surface is provided with a plurality of heat dissipation holes. The openings are favorable for air convection and radiate heat for the whole device.

1. The laser lighting device provided by the utility model can be matched with a camera to synchronously zoom, and can be used for the following purposesNight timeTracking the dynamic target;

2. due to the natural decoherence characteristic of the VCSEL, the VCSEL chip is adopted as a light source to obviously inhibit laser speckles, so that the light supplementing image acquired by a camera is finer;

3. by introducing the liquid crystal homogenizing sheet, a light supplementing light field which is completely matched with the field of view of the camera can be customized according to the size of the target surface of the camera, so that energy waste is effectively avoided; moreover, the liquid crystal homogenizing sheet homogenizes the illumination light field, the emergent light spots are projected to a far field more uniformly, the resolution ratio of the camera to the details of an object is higher at night, and the emergent light spots of the laser illuminating device can adapt to all different camera view fields on the market through customizing the homogenizing sheet; the utility model adopts the liquid crystal homogenizing sheet (the thickness of the substrate is 0.5 mm), and is lighter and thinner than other refraction type homogenizing sheets.

4. The laser lighting device provided by the utility model has a longer projection distance and is easier to realize tuning.

Drawings

FIG. 1 is a schematic view of a variable focus lens package in an embodiment;

FIG. 2 is a schematic diagram of a laser lighting device in an embodiment;

FIG. 3 is a schematic cross-sectional view of a laser illumination device in an exemplary embodiment;

wherein: the LED lamp comprises a 0-illuminated object, a 1-shell, a 2-driving circuit board, a 3-micro motor, a 4-cooling fan, a 5-VCSEL (vertical cavity surface emitting laser) chip module, a 6-collimating lens group, a 7-zooming moving lens group, an 8-zooming fixed lens group, a 9-collimating lens barrel, a 10-zooming lens holder, an 11-emergent lens barrel, a 12-photoelectric limit switch, a 13-liquid crystal homogenizing sheet, 14-ventilation holes and a 15-baffle sheet.

Examples

The utility model is further illustrated below with reference to specific examples. It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the wide-angle zoom lens assembly of the present embodiment includes a collimator lens group 6, a liquid crystal homogenizing sheet 13, a zoom moving lens group 7, and a zoom fixed lens group 8, which are disposed in this order.

The gaussian light spot emitted by the laser source is collimated by the collimating lens group 6 and then enters the liquid crystal homogenizing sheet 13. The lc homogenizing plate 13 consists of a number of tiny lc planar lenses whose focal length and contour shape are identical, the contour of the planar lenses determining the contour of the light field finally projected onto the illuminated object 0, which can be made to coincide with the camera field of view by tailoring the homogenizing plate. The regulation and control of the liquid crystal homogenizing sheet 13 on the incident laser light field is called light field differentiation, and the zoom moving lens group 7 can integrate and superimpose the light field differentiated by the homogenizing sheet at the rear focal plane position thereof, so that all directions of the light field after the integration and superposition are uniform. The integrated light field at the back focal plane position of the zoom movable lens group 7 serves as an object of the zoom fixed lens group 8, and the zoom movable lens group 7 forms an object moving with respect to the zoom fixed lens group 8 by changing the position, thereby forming uniform illumination at different positions in the far field. The larger the range of focal length variation of the entire zoom lens group (including the zoom movable lens group 7 and the zoom fixed lens group 8), the wider the distance range in which light can be supplemented.

As shown in fig. 2 to 3, the laser lighting device of this embodiment includes a cubic aluminum housing 1, a driving circuit board 2, a micro motor 3, a heat sink 4, a VCSEL (vertical cavity surface emitting laser) chip module 5, a collimator lens group 6, a zoom moving lens group 7, a zoom fixed lens group 8, a collimator lens barrel 9, a liquid crystal homogenizing sheet 13, a zoom lens frame 10, an exit lens barrel 11, and a photoelectric limit switch 12.

The surface of the aluminum shell 1 is provided with a plurality of ventilation holes, which provide the support and the necessary air convection for heat dissipation for the whole lighting device.

The radiator 4 is disposed at the rearmost end in the aluminum housing 1, and the radiator 4 is provided with a heat radiation fan electrically connected with the driving circuit board 2 disposed above the heat radiation fan. In other embodiments, other modes of heat sinks, such as fins, etc., may be employed.

The VCSEL chip module 5 is positioned in front of the radiator 4 and is tightly attached to the radiator 4, so that the radiator can conveniently and timely dissipate heat generated by the VCSEL chip during operation. The drive circuit board 2 is electrically connected with the VCSEL chip module 5 to provide power and control for the VCSEL chip.

The collimating lens barrel 9 is arranged in front of the VCSEL chip, the collimating lens group 6 is arranged in the collimating lens barrel 9, and the front focal plane of the collimating lens group 6 is positioned on the light emitting surface of the VCSEL chip and is used for collimating the light beam. The liquid crystal homogenizing sheet 13 is installed on the right end face of the collimator tube 9.

The zoom lens frame 10 is disposed in front of the collimator lens barrel 9, the zoom moving lens group 7 is mounted on the zoom lens frame 10 and driven by the micro motor 3 disposed above the collimator lens barrel 9, and the micro motor 3 is powered and controlled by the driving circuit board 2. A baffle 15 is arranged below the zoom lens frame 10, and the baffle 15 and the photoelectric limit switch 12 are matched to detect the limit of the movement of the zoom lens frame 10. An exit lens barrel 11 is provided at the front end of the housing 1, and a zoom fixed lens group 8 is mounted in the exit lens barrel 11. The zoom movable lens group 7 and the zoom fixed lens group 8 together constitute a zoom lens group.

The driving circuit board 2 controls the micro motor 3 to drive the zoom moving lens group 7 to move to zoom the system, so that the angle of light emitted from the emergent lens barrel 11 is changed.

The driving circuit board 2 can synchronously adjust the luminous power of the VCSEL chip module 5 and the rotating speed of the cooling fan according to the emergent angle so as to match the illumination energy requirements of different distances and ensure good heat dissipation.

It will be apparent that the foregoing is only a partial embodiment of the present utility model, and it is not intended to limit the present utility model, and it is to be understood that the present utility model may be combined and modified in various other features, and that modifications, equivalents, and equivalent arrangements or methods of the present utility model can be made by those skilled in the art without departing from the spirit and scope of the present utility model, and it is intended to cover all such modifications and equivalents as fall within the scope of the present utility model.

Claims

1. A wide angle zoom lens assembly, characterized by: comprises a collimating lens group for collimating the light beam; the liquid crystal homogenizing chip is used for differentiating the light field of the incident laser; the zoom mobile lens group is used for integrating and superposing the light field differentiated by the liquid crystal homogenizing sheet, and the light field subjected to integral superposition is uniform in all directions; a zoom fixed lens group; the collimating lens group, the liquid crystal homogenizing sheet, the zooming movable lens group and the zooming fixed lens group are sequentially arranged.

2. A laser lighting device, characterized by: the device comprises a laser transmitter module, a large-angle zoom lens assembly and a shell for installing the laser transmitter module and the large-angle zoom lens assembly, wherein the large-angle zoom lens assembly comprises a collimation lens group, a liquid crystal homogenizing sheet, a zoom moving lens group and a zoom fixing lens group which are sequentially arranged.

3. A laser lighting device as defined in claim 2, wherein: the laser transmitter module comprises a VCSEL chip, and the VCSEL chip is arranged at the rear end of the shell.

4. A laser light illumination device as claimed in claim 3, wherein: the housing is internally provided with a collimation lens barrel, the collimation lens barrel is arranged in front of the VCSEL chip, the collimation lens group is arranged in the collimation lens barrel, and the front focal plane of the collimation lens group is positioned on the light-emitting surface of the VCSEL chip.

5. A laser light illumination device as defined in claim 4, wherein: the liquid crystal homogenizing sheet is also arranged on the collimating lens cone.

6. A laser light illumination device as defined in claim 5, wherein: the zoom lens holder and the emergent lens cone are sequentially arranged in the shell, the zoom movable lens group is arranged on the zoom lens holder and electrically connected with a micro motor, and the zoom fixed lens group is arranged on the emergent lens cone.

7. A laser lighting device as defined in claim 6, wherein: the zoom lens frame is provided with a limiter of the miniature motor, and the limiter comprises a baffle plate and a photoelectric limit switch.

8. A laser lighting device as defined in claim 6, wherein: the laser lighting device further comprises a driving circuit board, and the driving circuit board is electrically connected with the VCSEL chip and the micro motor.

9. A laser lighting device as defined in claim 8, wherein: and a radiator is arranged on the shell, and the radiator is positioned behind the VCSEL chip and is close to the VCSEL chip.

10. A laser lighting device as defined in claim 2, wherein: the surface of the shell is provided with a plurality of heat dissipation holes.