Projection picture structure

Abstract

The invention discloses a projection picture manufacturing technology, and particularly relates to a projection picture structure which comprises a first substrate, a film layer, a pattern layer and a second substrate which are sequentially arranged. Starting from the material and size of the projection picture and the installation position of the whole structure, the problem that the quality of the image projected in a high-magnification Kohler illumination projection system is poor is solved, and the method can be used in the fields of picture projection display and the like.

Description

Technical Field

[0001] The invention discloses a projection picture structure, which is used for a high magnification Kohler illumination projection system. Background Art

[0002] The Kohler illumination system is widely used in projection systems, especially in advertising projection lamps, because it can make the illumination uniform. In the high-magnification Kohler illumination projection system, the surface quality of the projection pattern is very important. Small pollution will also be imaged after passing through the optical system with a very high magnification, which makes it difficult to install and replace the picture. On the other hand, the diaphragm has no thickness in the optical design, while the actual machined diaphragm always has a certain thickness, resulting in a dark ring in the projected image and burrs on the edge of the pattern, affecting the projection quality of the picture.

[0003] The purpose of the present invention is to solve the above problems, so that the projected image is clear and clean, with smooth edges and no dark rings. Summary of the invention

[0004] The present invention is a projection image structure, comprising a substrate first, a film layer, a pattern layer, and a substrate second arranged in sequence. The stain problem is solved by setting the thickness of the projection image substrate and ensuring the cleanliness of the installation environment. The problem of dark rings and burrs on the edges of the projected image is solved by coating a circular black film on the projection image.

[0005] Furthermore, the substrate can be ordinary quartz glass or optical glass, which is determined according to the required optical transmittance and system design indicators.

[0006] Furthermore, the thickness of the glass substrate is determined according to the magnification of the optical system and the illumination of the receiving surface.

[0007] Furthermore, the film layer is a black film layer, which is equivalent to the aperture of the optical system, and its thickness is basically negligible relative to mechanical processing, which can effectively prevent the dark ring caused by the aperture thickness.

[0008] Furthermore, the pattern layer is formed by engraving a pattern on a glass substrate using a laser and then coating it with a color film.

[0009] Furthermore, the pattern layer is resistant to high temperatures, does not fade after long-term laser irradiation, and the stripe fineness can reach several microns.

[0010] Furthermore, one of the two substrates is a square sheet and the other is a round sheet, wherein the area of ​​the substrate one is greater than the area of ​​the substrate two.

[0011] Furthermore, the pattern layer needs to be removed from the fine impurities in an ultra-clean workshop using a microscope and optical lens paper.

[0012] Furthermore, the two substrates need to be glued together using high temperature resistant optical glue to ensure a firm fit between the two substrates.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The black film layer is equivalent to the aperture of the projection system. Compared with mechanical processing, its thickness is almost negligible, which can effectively prevent the projected pattern from having dark rings and has lower cost.

[0015] (2) The film layer on the aperture is circular, and its edge is smoother than that of mechanical processing. In a high magnification system, the burrs caused by mechanical processing are basically invisible on the edge of the projected pattern.

[0016] (3) The entire structure is made of two glass substrates glued together to protect the pattern inside, which can effectively prevent dust in the air from contaminating the pattern layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram of the optical components of an advertising projection lamp based on Kohler illumination. 1. Light source; 2. Lens 1; 3. Projection image module; 4. Lens 2.

[0018] Figure 2 Schematic diagram of the projection image structure, wherein 301 is substrate one; 302 is film layer; 303 is pattern layer; 304 is substrate two.

[0019] Figure 3 It is a schematic diagram of the structure of the projection picture module, wherein 305 is the second fixing hole of the base, and 306 is the first fixing threaded hole of the base. DETAILED DESCRIPTION

[0020] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments and drawings. It should be understood by those skilled in the art that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0021] See also Figure 1 , is an advertising projection lamp system based on Kohler illumination, with a magnification of 1000 times, using light source (1) for illumination, which is a laser-excited fluorescence light source, lens one (2) is a Kohler mirror, which is an aspheric lens with a diameter of 6.35 mm and a focal length of 4 mm, lens two (4) is an imaging objective lens, which is a double-cemented achromatic lens, and the projection picture module (3) acts as an aperture in this projection system, with a light aperture of 5 mm.

[0022] See also Figure 2A projection image structure includes a substrate one (301), a film layer (302), a pattern layer (303), and a substrate two (304) which are arranged in sequence.

[0023] Substrate 1 and substrate 2 use Schott's optical glass to increase transmittance. Substrate 1 is a circular glass sheet with a size of φ18 mm and a thickness of 3 mm, and substrate 2 is a square glass sheet with a side length of 9 mm and a thickness of 3 mm.

[0024] The projected pattern piece is equivalent to the object space of an optical system. The object points within this depth range form a clear image through the optical system. U is the aperture angle, p is the entrance pupil distance, and ε is the limit resolution angle of the diffuse spot to the human eye. According to the formula It can be calculated that a thickness of 3 mm can make the diffuse spot of the stain on the outer surface of the projection pattern sheet larger than the resolution limit of the human eye, so that the stain cannot be clearly observed by the human eye. The thickness of the substrate is also related to the magnification of the optical system and the illumination of the receiving surface. The size of the magnification affects the size of impurities that need to be removed from the substrate surface. The larger the magnification, the smaller the contaminants that need to be removed. The greater the illumination required for the receiving surface, the smaller the thickness of the substrate needs to be. Therefore, it is necessary to comprehensively consider the above factors and finally determine the thickness of the substrate through experimental results. In this embodiment, it is finally concluded that a thickness of 3 mm is appropriate.

[0025] A black film layer is coated on the second substrate to act as an aperture. Because it is a coated film layer, its thickness is negligible compared to mechanical processing, which can effectively solve the problem of dark rings in the projected pattern. At the same time, a pattern is engraved within a circle with a diameter of 5 mm in the center of the second substrate, and then a color film is coated according to the color required by the pattern.

[0026] After processing, assemble in a dust-free clean environment, observe under a microscope, use optical lens paper and optical reagents to remove small contaminants on the pattern layer and substrate one little by little to prevent the projected pattern from having many stains after being loaded into the lens barrel. After cleaning, use a fixture to position substrate two, and then use optical glue to glue the two substrates together to prevent the pattern from being exposed to the air and contaminated.

[0027] See also Figure 3 , install the projected image structure into the module, align the base 2 with the base 2 mounting hole (305), screw the pressure ring onto the base 1 fixing threaded hole (306), and then install the entire module into the lens barrel. Finally, observe that the projected light spot has no spots and stains, no dark rings on the edges, and the boundary between light and dark is smooth and burr-free.

[0028] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A projection picture structure, characterized in that The invention comprises a substrate first, a film layer, a pattern layer and a substrate second which are arranged in sequence.

2. A projection picture structure according to claim 1, characterized in that: The substrate 1 and the substrate 2 are made of the same material, which can be ordinary quartz glass or optical glass.

3. A projection picture structure according to claim 1, characterized in that: The thickness of the substrate 1 and the substrate 2 is equal, and is between 1 mm and 4 mm.

4. A projection picture structure according to claim 1, characterized in that: The area of ​​the substrate one is greater than the area of ​​the substrate two.

5. A projection picture structure according to claim 1, characterized in that: The base 1 is a circular sheet.

6. A projection picture structure according to claim 1, characterized in that: The second substrate is a square sheet.

7. A projection picture structure according to claim 1, characterized in that: The film layer is a black ring.

8. A projection picture structure according to claim 1, characterized in that: The pattern layer is formed by engraving a pattern on the substrate 2 using a laser and then coating it with a color film.

9. A projection picture structure according to claim 1, characterized in that: The pattern layer is resistant to high temperatures and does not fade when irradiated by laser for a long time.

10. A projection picture structure according to claim 1, characterized in that: The substrate 1 and the substrate 2 are glued together using optical glue.

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