CN216210462U

CN216210462U - Metal screen with uniform gain

Info

Publication number: CN216210462U
Application number: CN202122685460.0U
Authority: CN
Inventors: 李艳龙
Original assignee: Shenzhen Timewaying Technology Co ltd
Current assignee: Shenzhen Timewaying Technology Co ltd
Priority date: 2021-03-08
Filing date: 2021-11-04
Publication date: 2022-04-05
Anticipated expiration: 2031-11-04

Abstract

The utility model is suitable for the technical field of projection screens, and provides a metal screen with uniform gain, wherein the metal screen is provided with a reflecting surface, concave reflecting units are densely distributed on the reflecting surface, and at least 90% of the reflecting units in each reflecting unit are in a concave spherical crown reflecting structure and/or a concave paraboloid of revolution reflecting structure. The reflection unit of the part of the concave spherical crown reflection structure and/or the concave paraboloid of revolution reflection structure can only reflect incident light once, and the part of the reflection unit has very uniform reflection characteristics independent of angles on the whole, so that the proportion of the reflection unit can be increased as much as possible under the condition of process permission, the brightness uniformity of the metal screen is improved to the maximum extent, and the problem of bright spots at the center of the metal screen is effectively solved.

Description

Metal screen with uniform gain

Technical Field

The utility model belongs to the technical field of projection screens, and particularly relates to a metal screen with uniform gain.

Background

With the improvement of living standard of people, watching movies has become one of the important ways for people to entertain and relax. The principle of the projection film system is that a projector is adopted to project light beams carrying image information to a metal screen, and the light beams are reflected by the metal screen and then received by audiences.

Brightness coefficient R of screen_αIs an important optical index, which is the screen brightness B in the direction of alpha angle with the normal direction on the side of the screen when the incident light is along the normal direction of the screen under the same lighting condition and specified observation condition_αBrightness B of ideal diffuse curtain under the same conditions_ORatio of (i.e. R)_α＝B_α/B_O. Usually by the luminance coefficient R_αBecomes the screen gain.

At present, the gain of a common metal screen is obviously changed along with the visual angle, the center brightness of the metal screen is the highest, and the brightness of the metal screen is lower toward the edge, so that the brightness uniformity of the whole metal screen is very poor, the viewing experience of audiences is influenced, and the problem that the whole film industry is troubled for many years is solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of how to improve the bright spot problem at the center of the metal screen and improve the brightness uniformity of the whole metal screen.

In order to solve the above technical problems, the present invention is achieved by a metal screen with uniform gain, the metal screen having a reflecting surface on which depressed reflecting units are densely distributed; in each reflecting unit, at least 90% of the reflecting units are in a concave spherical crown reflecting structure and/or a concave paraboloid of revolution reflecting structure.

Further, the ratio of the spherical cap depth h to the spherical cap curvature radius R of the concave spherical cap reflective structure is less than 0.3.

Further, the ratio of the spherical cap depth h to the spherical cap curvature radius R of the concave spherical cap reflective structure is less than 0.2.

Further, each concave spherical cap reflection structure has the same ratio of the spherical cap depth h to the spherical cap curvature radius R, and the spherical cap curvature radii R are the same or different.

Furthermore, all the concave spherical cap reflecting structures are divided into a plurality of groups, the concave spherical cap reflecting structures in each group have the same ratio of the spherical cap depth h to the spherical cap curvature radius R, and the ratio of the spherical cap depth h to the spherical cap curvature radius R in each group is different.

Furthermore, convex reflecting structures are arranged between the reflecting units, and the convex reflecting structures are not adjacent to each other.

Further, the metal screen comprises a substrate layer and a metal reflecting layer, wherein the substrate layer and the metal reflecting layer are sequentially arranged, and the metal reflecting layer is used as the reflecting surface.

Further, the metal screen further comprises a protective layer, and the protective layer is arranged on one side, away from the base material layer, of the metal reflecting layer.

Furthermore, the substrate layer is stamped or coated to form a dense concave structure, and the metal reflecting layer is coated on the substrate layer to form the reflective unit with dense concave on the surface.

Furthermore, the surface of the substrate layer is flat, and the metal reflecting layer is stamped or coated to form the reflecting units which are densely distributed and sunken.

The reflecting surface of the metal screen provided by the utility model is densely provided with the sunken reflecting units, wherein at least 90% of the reflecting units are of a concave spherical crown reflecting structure and/or a concave paraboloid of revolution reflecting structure, and the partial reflecting units only reflect incident light once, so that most of the light reflected to the auditorium on the metal screen is reflected once. Moreover, the reflection unit has very uniform reflection characteristics independent of angles on the whole, the proportion of the reflection unit can be increased as much as possible under the condition of process permission, the brightness uniformity of the metal screen is improved to the maximum extent, and the problem of bright spots at the center of the metal screen can be effectively improved.

Drawings

Fig. 1 is a front view of a metal screen with uniform gain provided by the present invention;

FIG. 2 is a partially enlarged schematic view of a metal screen with uniform gain according to the present invention;

FIG. 3 is a perspective view of a concave spherical cap reflective structure provided by the present invention;

FIG. 4 is a cross-sectional view of a concave spherical cap reflective structure provided by the present invention;

FIG. 5 is a graph of the gain of a metal screen using a concave spherical cap reflective structure according to the present invention;

FIG. 6 is a graph showing the gain of a conventional metal screen according to the present invention;

FIG. 7 is a graph of the gain of a metal screen employing a concave paraboloid of revolution configuration according to the present invention;

fig. 8 is a side view of a metal screen with uniform gain provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 and 2, the metal screen with uniform gain provided by the present invention has a reflective surface 1, wherein a plurality of concave reflective units 11 are densely distributed on the reflective surface 1, and fig. 2 is an enlarged perspective view of a portion a in fig. 1, and it can be seen that the entire reflective surface 1 is similarly distributed with "pits". In contrast, the convex reflecting structures 12 are formed in the portions between the reflecting units 11, and the convex reflecting structures 12 may be actually convex reflecting structures, or may be only convex reflecting surfaces relative to the reflecting units 11 but actually horizontal reflecting surfaces, and when the convex reflecting structures 12 are actually convex outward, it is necessary to ensure that the convex reflecting structures 12 are not adjacent to each other so as to avoid multiple reflections. The reflecting unit 11 and the convex reflecting structure 12 are made of the same material, and the conventional requirements of the metal screen are met.

In each reflecting unit 11, at least 90% of the reflecting units 11 required in shape to be incident inside are of a concave spherical crown reflecting structure and/or a concave paraboloid of revolution reflecting structure, the incident light is reflected only once by the emitting units 11 in the part, and the proportion of the reflecting units 11 can be increased as much as possible under the condition of process permission, so that all the reflecting units 11 basically reflect the light only once. The convex reflecting structure 12 is limited by the outward convex shape, so that the light incident on the convex reflecting structure 12 can reach the auditorium only by once reflection, therefore, basically all the light reflected to the auditorium is only reflected once on the metal screen, the reflecting units 11 at most positions on the whole metal screen have the reflecting characteristic which is very uniform and independent of angles, the brightness uniformity of the metal screen is maximally improved, and the bright spot problem at the center of the metal screen is effectively improved. And moreover, the polarization contrast ratio is high, and the problem of crosstalk of left-eye and right-eye images of a 3D movie can be improved.

In addition, it is found through experiments that if the reflection unit 11 is designed into a regular honeycomb structure of hexagonal grid, the reflection light can form a hexagonal interference pattern on the surface of the screen, and the pattern can affect the quality of the reflected image of the screen, which is not desirable, therefore, in the metal screen provided by the utility model, the reflection unit 11 is designed into a concave spherical crown reflection structure and/or a concave paraboloid of revolution reflection structure, which are mostly parallel to the metal screen, and the cross section curve of the reflection unit 11 is smooth, so that the reflection light can not form an interference pattern on the surface of the screen, and the imaging quality is ensured.

The number of concave structures with smooth cross-section curves is large, and the concave structures can be flexibly designed according to needs, and as mentioned above, the utility model provides two design schemes of the reflecting unit 11: the first type is a concave spherical crown reflection structure, the second type is a concave revolution paraboloid reflection structure, and on the same metal screen, the first design scheme can be adopted completely, the second design scheme can be adopted completely, and the first design scheme and the second design scheme can be adopted for mixed use.

For the first design, as shown in fig. 3 and 4, the depth of the spherical cap of the concave spherical cap is h, the radius of the top section circle of the concave spherical cap is R, the curvature radius of the spherical cap of the concave spherical cap is R, and the ratio of the depth of the spherical cap h to the curvature radius of the spherical cap of the concave spherical cap reflection structure is required to be less than 0.3, so as to ensure that the incident light is reflected only once. It should be noted that, the central position of the metal screen is vertical incidence, and when oblique incidence is not considered, the conditions for 2 reflections are: the light ray is incident along the direction of the semicircular central line and is reflected in the horizontal direction, namely, the included angle between the incident light ray and the reflected light ray is 90 degrees, at the moment: the ratio of the depth h of the spherical crown of the concave spherical crown to the curvature radius R of the spherical crown of the concave spherical crown is

I.e. 0.3. Incident light on the whole spherical crown section can be reflected back to the hemisphere with a solid angle of 2 pi. This means that when h/R is less than

When the metal screen is used, light rays perpendicular to the surface of the metal screen are reflected only once. Considering the case of oblique incidence, h/R is preferably less than 0.2. The gain curve is shown in fig. 5, and it can be seen that the gain curve is similar to a lambertian screen, which is called "lambertian-like screen", and in addition, compared with the gain curve of the ordinary screen shown in fig. 6, it can be seen that the gain of the metal screen adopting the concave spherical crown reflection structure is more uniform.

In the specific design, each concave spherical cap reflection structure has the same ratio of the spherical cap depth h to the spherical cap curvature radius R, and the spherical cap curvature radii R are the same or different.

Or all the concave spherical cap reflecting structures can be divided into a plurality of groups, the concave spherical cap reflecting structures in each group have the same ratio of the spherical cap depth h to the spherical cap curvature radius R, the ratio of the spherical cap depth h to the spherical cap curvature radius R in each group is different, and the spherical cap curvature radius R can be the same or different compared with each group. The proposal can realize the purpose of adjusting the shape of the gain curve by adjusting the proportion of the reflection structures of all groups of concave spherical crowns on the screen.

For the second design, the tangent plane of the concave paraboloid of revolution satisfies the equation of the upper opening parabola, specifically x²＝2py(p>0) The gain can be adjusted by adjusting p, and the gain curve is shown in fig. 7.

By using the concave spherical crown reflecting structure and the concave paraboloid of revolution structure in different proportions, the variation of the gain along with the angle can be adjusted, so that the expected shape of the gain curve is obtained.

Fig. 8 is a side view of the metal screen with uniform gain according to the present invention, and it can be seen that the metal screen includes a substrate layer 81 and a metal reflective layer 82 as the reflective surface 1, which are sequentially disposed, and the metal reflective layer 82 can be plated on the surface of the substrate layer 81 by electroplating. Further, in order to prevent the metal reflective layer 82 from being scratched and worn, a protective layer 83 is further provided on the side of the metal reflective layer 82 away from the base material layer 81.

The surface of the metal reflective layer 82 may have the characteristics of the upper reflective surface 1, and in the specific manufacturing process, the substrate layer 81 may be embossed or coated to form a dense concave structure, and the metal reflective layer 82 may be plated on the substrate layer 81, so that the metal reflective layer 82 may form the reflective unit 81 having the above-mentioned dense concave structure on the surface of the substrate layer 81. Wherein, the impression can adopt the mode of physics to realize, the depressed structure who accords with the requirement is suppressed out on substrate layer 81, and the mode of common bat printing in the semiconductor technology can be chooseed for use to the coating mode and realize, at first designs suitable bat printing version according to the position of depressed structure, adopts this bat printing version preparation substrate layer 8, can obtain substrate layer 81 with depressed structure.

Similarly, the surface of the substrate layer 81 may be flat, and the reflective units 11 with densely-distributed recesses may be formed on the metal reflective layer 82 by stamping or coating.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A metal screen with uniform gain is characterized in that the metal screen is provided with a reflecting surface, and concave reflecting units are densely distributed on the reflecting surface; in each reflecting unit, at least 90% of the reflecting units are in a concave spherical crown reflecting structure and/or a concave paraboloid of revolution reflecting structure.

2. The metallic screen with uniform gain of claim 1, wherein the concave spherical cap reflecting structure has a ratio of spherical cap depth h to spherical cap radius of curvature R of less than 0.3.

3. The metallic screen with uniform gain of claim 2, wherein the concave spherical cap reflecting structure has a ratio of spherical cap depth h to spherical cap radius of curvature R of less than 0.2.

4. The screen of claim 2 or 3, wherein the concave spherical cap reflecting structures have the same ratio of spherical cap depth h to spherical cap radius of curvature R, and the spherical cap radii of curvature R are the same or different.

5. The screen according to claim 2 or 3, wherein all the concave spherical cap reflecting structures are divided into a plurality of groups, each group of concave spherical cap reflecting structures has the same ratio of spherical cap depth h to spherical cap curvature radius R, and the ratio of spherical cap depth h to spherical cap curvature radius R is different for each group.

6. The metal screen with uniform gain according to claim 1, wherein convex reflecting structures are provided between the reflecting units, and the convex reflecting structures are not adjacent to each other.

7. The metal screen having a uniform gain according to claim 1, wherein the metal screen comprises a substrate layer and a metal reflective layer as the reflective surface which are sequentially disposed.

8. The metal screen with uniform gain according to claim 7, further comprising a protective layer disposed on a side of the metal reflective layer away from the substrate layer.

9. The metal screen with uniform gain according to claim 7 or 8, wherein the substrate layer is embossed or coated to form a dense concave structure, and the metal reflective layer is coated on the substrate layer to form the reflective unit with a dense concave structure on the surface.

10. The metal screen with uniform gain according to claim 7 or 8, wherein the surface of the substrate layer is flat, and the reflective units with densely-distributed recesses are formed on the metal reflective layer by stamping or coating.