CN201837821U - projector - Google Patents

Abstract

The projector comprises a light source module, a light source lens group, an image imaging device and a projection lens group, wherein a plurality of convex points are arrayed on the light incident surface and the light emergent surface of the dodging lens; the light source lens group is provided with a light filtering beam-converging lens at the light emergent end, and the light incident surface of the light filtering beam-converging lens is a convex arc surface; because the light inlet and outlet surfaces of the dodging lens are provided with the convex points, the dodging effect is better, and even if the light beam converging rate of the light converging lens is high, a surface light beam with even light intensity distribution can be formed; the light filtering beam-collecting mirror is arranged, so that the light loss is reduced, the light beam with uneven light intensity can be uniformly distributed after the light homogenizing treatment by the light homogenizing lens, and the light intensity distribution is more uniform after the light homogenizing treatment by the light filtering beam-collecting mirror; the utility model discloses both reduced the light loss among the light source arrangement process, improved the illumination degree of consistency in the illumination region again to make the projection image clear and luminance is high, it is little influenced by ambient light source, excellent in use effect.

Description

projector

technical field

The utility model relates to the field of image output equipment, in particular to a projector.

Background technique

A projector generally includes a light source module, a light source lens group, an image imaging device, and a projection lens group. During operation, the light beam emitted from the light source module is organized into a uniform beam through the light source lens group. The uniform beam is projected on the image imaging device to illuminate the formed After the image of the imaging device is amplified and output by the projection lens group, a projected image is formed in front of the projection lens group.

The clarity and brightness of the projected image depend on the light intensity and illumination uniformity of the uniform light beam supplied to the imaging device, and the light intensity and illumination uniformity of the uniform light beam are completed by the light source lens group to organize the light beam emitted by the light source module. Therefore, the projection The projected image quality of the instrument is closely related to the performance of the light source lens.

Most of the light source modules of existing projectors use a plurality of point light source arrays to form an area light source, and each point light source emits a light beam, which is sorted into a uniform light beam by the light source lens group. Because the light beams emitted by the point light sources that make up the light source module have high brightness in the central area, the light intensity and brightness are low when they radiate to the surrounding areas, and shadow areas will be formed in the coherent areas of the light beams. Therefore, when the light source lens group organizes the light beams emitted by each point light source, generally a convex lens-type light converging mirror with a light incident surface as a plane and a light exit surface is convex to converge the light beams emitted by each point light source to form a high-brightness beam , the light intensity in the central area of the high-brightness beam is high, and the light intensity around it is low, and then the light intensity of the high-brightness beam is arranged evenly by a uniform light lens with a light-incoming surface as a concave-convex surface with multiple convex points, and a light-emitting surface as a plane , forming a surface beam with uniform light intensity distribution in the area to illuminate the image of the imaging device.

In the light source lens group mentioned above, when the uniform light treatment is performed in the process of sorting the light beam, since the light incident surface of the uniform light lens is an uneven surface, when the light enters the uniform light lens, the incident angles of each point are different, and each point enters the uniform light. The angle of refraction is also different when the light of the optical lens exits the light, so some light will escape out of the irradiation area of the image imaging device and cause light loss, reduce the light intensity of the surface beam formed, make the projected image darker, and be vulnerable to the projection environment. The interference of other light sources affects the use of the projector. In order to increase the light intensity of the surface beam, it is generally used to increase the power of the light source module, which will increase the energy consumption, increase the cost of use, and increase the difficulty of heat dissipation of the light source module, and the service life of the image; another method is It is to increase the light converging rate of the light converging mirror to make the intensity of the formed high-brightness beam more concentrated, but this method will increase the difficulty of uniform light treatment, so that the surface beam formed by the uniform light lens will still have a center The phenomenon that the brightness of the area is higher than that of the surrounding area, which reduces the clarity of the projected image.

Therefore, it is difficult for existing projectors to take into account the two aspects of reducing light loss and improving illumination uniformity.

Contents of the invention

The purpose of the utility model is to provide a projector which can not only reduce the light loss in the light source arrangement process, but also improve the uniformity of illumination in the illumination area in view of the deficiencies of the prior art.

In order to achieve the above object, the utility model adopts the following technical solutions.

The projector includes a light source module, a light source lens group, an image imaging device and a projection lens group, the light source module includes a light source formed by a plurality of point light source arrays, and the light source lens group has a light converging mirror and a dodging lens The light incident surface and the light exit surface of the uniform light lens are evenly arrayed with a plurality of convex points; A convex arc surface.

The utility model includes the following further technical solutions.

The light converging mirror includes a light source concentrating lens and a transition converging mirror in sequence according to the light propagation direction. Convex curved surface, the maximum diameter of the transition converging mirror is larger than the maximum diameter of the light source concentrating lens.

Wherein, the light incident surface of the light source concentrating lens is an arc-shaped light incident surface that is gradually concave from the periphery to the center.

Further, the convex point of the homogenizing lens is a convex point whose top surface is a convex convex surface and whose side surface is a plane parallel to the light propagation direction.

The light source lens group includes at least two transitional converging mirrors.

The light source lens group includes at least two uniform light lenses.

Further, transition converging mirrors are arranged at intervals between the homogenizing lenses, and the light incident surface of the filter converging mirror is directly facing the light emitting surface of a homogenizing lens.

Alternatively, the light source lens group is provided with at least two transitional converging mirrors, and the transitional converging mirrors and uniform light lenses are arranged in sequence according to the light propagation direction.

According to the above, the arc height of the light-incident surface of the light-filter converging mirror is less than 1/10 of the aperture of the light-filter converging mirror.

Wherein, the axial direction of the light source lens group on the garment is inclined to the axial direction of the imaging device, and a refraction sheet is arranged at the intersection of the imaging device and the axis of the light source lens group.

The beneficial effects of the utility model are: a projector, including a light source module, a light source lens group, an image imaging device and a projection lens group, the light source module includes a light source formed by a plurality of point light source arrays, and the light source lens group has A light beam converging mirror and a homogenizing lens, the light incident surface and the light emitting surface of the uniform light lens are uniformly arrayed with a plurality of convex points; the light source lens group is provided with a filter converging mirror at the light emitting end, The light incident surface of the converging mirror is a convex arc surface; after the light is emitted from the light source module, it is collected by the light converging mirror to form a high-brightness beam, and then passes through the uniform light lens to form a light beam with uniform light intensity. Surface beam, because the light incident surface and the light exit surface of the uniform light lens are provided with convex points, the uniform light effect is better, so even if the light beam converging rate of the light converging mirror is high, the formed high-brightness beam can be passed through Uniform light lens to form a surface beam with uniform light intensity distribution in the irradiation area; and because the filter converging mirror is provided, the light scattered through the light-emitting surface of the uniform light lens is passed by the outer surface of the filter converging mirror The convex arc-shaped light-incoming surface collects and converges, and emits uniformly through the flat light-emitting surface of the filter converging mirror, forming a surface beam with the same propagation direction in all directions and uniform light intensity distribution in the illuminated area, thereby reducing The light dissipation loss caused by the unevenness of the lens surface. At the same time, because the light incident surface of the filter converging mirror is a curved surface, the incident angles of each point are different, which can also play a uniform light finishing effect, so that The light intensity of the light beam that is still uneven after the lens is homogenized is further uniformed by the filter converging mirror; the light intensity distribution is more uniform; the utility model not only reduces the light loss in the light source finishing process, but also improves the illumination Uniformity of illumination in the area, so that the projected image is clear and bright, less affected by ambient light sources, and the use effect is good.

Description of drawings

The utility model is further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present utility model.

FIG. 1 is a schematic diagram of the internal structure of the projector of the present invention.

FIG. 2 is a schematic diagram of the internal structure of the projector of the present invention from another perspective.

Fig. 3 is a structural schematic diagram of the light source converging mirror of the projector of the present invention.

FIG. 4 is a schematic structural view of the rear uniform light lens of the projector of the present invention.

Figures 1, 2, 3 and 4 include:

1——light source module 211——light source concentrating lens 212——transition converging mirror

22——uniform light lens 221——convex point 23——filter converging mirror

3——Image imaging device 4——Projection lens group 5——Refraction sheet. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figure 1 and Figure 2, the projector described in the utility model includes a light source module 1, a light source lens group, an image imaging device 3 and a projection lens group 4, and the light source module 1 includes a plurality of point light sources A light source formed in an array, the light source lens group has a light converging mirror and a uniform light lens 22, and the light incident surface and the light output surface of the light uniform lens 22 are uniformly arrayed with a plurality of convex points 221; the light source lens group A light-filter converging mirror 23 is arranged at the light-emitting end, and the light-incident surface of the light-filter converging mirror 23 is an outwardly convex arc-shaped surface.

When the utility model is in use, after the light is emitted by the light source module 1, it is collected by the light converging mirror to form a high-brightness beam, and then a surface beam with uniform light intensity is formed by the uniform light lens 22. The light incident surface and the light exit surface of the uniform light lens 22 are provided with bumps 221, and the uniform light effect is better. Therefore, even if the light beam converging rate of the light converging mirror is high, the formed high-brightness beam can be passed through the uniform light lens. 22 to form a surface beam with an average light intensity distribution in the irradiation area; The convex arc-shaped light-incoming surface collects and converges, and evenly emits through the planar light-emitting surface of the filter converging mirror 23, forming a surface beam with the same propagation direction in all directions and uniform light intensity distribution in the illumination area, thereby reducing the The light dissipation loss caused by the uneven surface of the homogenizing lens 22, and at the same time, because the light incident surface of the filter converging mirror 23 is a curved surface, and the incident angles of each point are different, it can also play a uniform light finishing effect, The light beam that is still uneven in light intensity after being uniformed by the uniform light lens 22 is further uniformed by the filter converging mirror 23, and the light intensity distribution is more uniform; the utility model not only reduces the light intensity in the light source finishing process Loss, and improve the illumination uniformity in the illumination area, so that the projection image is clear and bright, less affected by the ambient light source, and the use effect is good.

The sorted surface light beam becomes the light source for imaging by the image imaging device 3 . After the image information is formed by the image imaging device 3 , it enters the projection lens group 4 and exits the projection lens group 4 to form a projected image.

Wherein, the light converging mirror includes a light source concentrating lens 211 and a transition converging mirror 212 in sequence according to the light propagation direction, the light source concentrating lens 211 is facing the light source module 1, the light source concentrating lens 211 and the transition converging lens 212 The light emitting surfaces of the mirror 212 are all convex arc surfaces, and the maximum aperture of the transition converging mirror 212 is larger than the maximum aperture of the light source concentrating lens 211 . The light emitted by the light source module 1 is concentrated and processed by the light source concentrating lens 211 to form a high-brightness concentrated beam; since the maximum diameter of the transitional converging mirror 212 is larger than the maximum diameter of the light source concentrating lens 211, Then the illuminated area of the light beam arranged through the transition converging mirror 212 becomes larger, forming a larger high-brightness light beam, which is convenient for the uniform light finishing of the uniform light lens 22, and improves the uniform light effect of the light uniform lens 22. Therefore, even if the light source The concentrating lens 211 has a high light beam converging rate, which is also convenient for the uniform light lens 22 to perform uniform light processing, thereby improving the reliability of the projector.

As shown in FIG. 3 , the light incident surface of the light source concentrating lens 211 is an arc-shaped light incident surface that is gradually concave from the periphery to the center. This concave curved light incident surface is easier to collect concentrated light and reduce light loss.

As shown in FIG. 4 , the bump 221 of the uniform light lens 22 is a bump 221 whose top surface is convex and the side surface is a plane parallel to the light propagation direction. The convex point 221 of this shape ensures that the light is collected from the top surface, while the side is parallel to the direction of light propagation, so no light enters and exits, reducing light loss.

The light source lens group includes at least two transition converging mirrors 212 . More preferably, according to the direction of light propagation, the maximum aperture of the transitional converging mirror 212 at the front is greater than the maximum aperture of the transitional converging mirror 212 at the rear, so that the high-brightness beam can be processed by several transitional converging mirrors 212 to illuminate the light beam. The area gradually increases, which is more convenient for the homogenization lens 22 to perform homogenization treatment

The light source lens group includes at least two uniform light lenses 22 . In this way, the light beam undergoes uniform light treatment several times, which further improves the uniformity of light intensity distribution in the irradiation area.

Further, transition converging mirrors 212 are arranged at intervals between the homogenizing lenses 22 , and the light incident surface of the filter converging mirror 23 faces the light emitting surface of a homogenizing lens 22 .

Alternatively, the light source lens group is provided with at least two transitional converging mirrors 212 , and the transitional converging mirrors 212 and uniform light lenses 22 are arranged in sequence according to the light propagation direction.

The arrangement of the above-mentioned transition converging mirror 212 and uniform light lens 22 can be combined according to actual needs to further improve the uniformity of illumination and reduce light loss.

The arc height of the light incident surface of the light filter converging mirror 23 is less than 1/10 of the caliber of the light filtering converging mirror 23 . The filter converging mirror 23 is mainly used to reduce light loss and further improve the effect of light uniformity, rather than the effect of light converging, so the arc height should not be too high, and a slight arc is sufficient.

Wherein, the axial direction of the light source lens group of the garment main body is inclined to the axial direction of the imaging device 3 , and a refraction sheet 5 is arranged at the intersection of the imaging device 3 and the axis of the light source lens group.

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application scope are all included in the utility model patent application scope .

Claims (10)

1. Projector, it comprises light source module, light source lens group, image imaging device and projection lens group, described light source module includes the light source that is formed by a plurality of point light source arrays, and described light source lens group has light converging mirror And uniform light lens, it is characterized in that: The light incident surface and the light exit surface of the uniform light lens are uniformly arrayed with a plurality of convex points; The light source lens group is provided with a filter converging mirror at the light output end, and the light incident surface of the light filtering converging mirror is a convex arc surface. 2. The projector according to claim 1, wherein the light converging mirror sequentially includes a light source concentrating lens and a transition converging mirror according to the light propagation direction, the light source concentrating lens is facing the light source module, The light emitting surfaces of the light source concentrating lens and the transition converging mirror are both convex arc surfaces, and the maximum diameter of the transition converging mirror is larger than the maximum diameter of the light source concentrating lens. 3 . The projector according to claim 2 , wherein the light incident surface of the light source concentrating lens is an arc-shaped light incident surface that is gradually concave from the periphery to the center. 4 . 4 . The projector according to claim 3 , wherein the convex point of the homogenizing lens is a convex point whose top surface is convex and the side surface is a plane parallel to the light propagation direction. 5 . 5. The projector according to claim 4, wherein the light source lens group comprises at least two transitional converging mirrors. 6. The projector according to claim 4, wherein the light source lens group comprises at least two uniform light lenses. 7. The projector according to claim 6, characterized in that: transition converging mirrors are arranged at intervals between the uniform light lenses, and the light incident surface of the filter converging mirror is facing a uniform light lens. light surface. 8 . The projector according to claim 6 , wherein the light source lens group is provided with at least two transitional converging mirrors, and the transitional converging mirrors and homogenizing lenses are arranged in sequence according to the light propagation direction. 9. The projector according to any one of claims 1-8, characterized in that: the arc height of the curved light-incident surface of the light-filter converging mirror is less than 1/10 of the diameter of the light-filter converging mirror. 10. The projector according to claim 9, characterized in that: the axial direction of the light source lens group of the clothing main body is inclined to the axial direction of the image imaging device, and the image imaging device and the light source lens group A refraction sheet is provided at the intersection of the axes.

Images