CN117799155A - Method for installing Mylar film and visual virtual image display system - Google Patents

Abstract

The invention provides a method for installing a Mylar film, which comprises the following steps: mounting the polyurethane film to the base structure such that a first side of the polyurethane film contacts the base structure; surface treating a second side of the polyurethane film opposite the first side; a mylar film is attached to the second side of the polyurethane film. The method for installing the Mylar film is simple to operate, low in installation cost, high in fault tolerance and capable of allowing the installation position of the Mylar film to be adjusted for multiple times. In addition, the invention also provides a visual virtual image display system for a flight simulator, wherein the display system is provided with a Mylar film according to the method.

Description

Method for installing Mylar film and visual virtual image display system

Technical Field

The invention relates to the field of integration of virtual images of a visual scene of a flight simulator. In particular, the present invention relates to a method for installing a mylar film. The invention also relates to a visual virtual image display system for a flight simulator, which is provided with the Mylar film by the method.

Background

Vision systems are often used in flight simulation training, for example, to simulate displaying a scene outside the cockpit window. As a key system of the flight simulator, the fidelity of the vision system directly influences and determines the display effect and development level of the simulator. The virtual image display mode is widely applied to a large-scale high-grade flight simulator platform due to the characteristics of high imaging fidelity, strong depth sense and the like.

Flight simulator virtual view display systems are typically constructed as curved screens implemented with a large arc. The imaging principle of the system is that an upright and infinite virtual image is formed on a Mylar film imaging mirror through refraction and reflection of light.

At present, in a visual virtual image display system which is used in the field of visual virtual images of flight simulators, the installation of a Mylar film is realized by means of high-strength double faced adhesive tape. Specifically, a high-strength double-sided adhesive tape is used on the view structure, so that the view structure is directly adhered to the surface of the Mylar film, and the imaging lens cavity is sealed. On this basis, metal pressing plates are usually matched with the surface of the Mylar film, threaded holes are formed in the pressing plates at fixed intervals, and the pressing plates are reinforced by matched bolts, so that the imaging lens film is firmly fixed on a view structure.

However, this mounting method has been found in the art to suffer from the following drawbacks:

firstly, the use of the high-strength double faced adhesive tape makes it impossible for an installer to perform secondary adjustment on the mylar film. For example, if the mailer attachment position is not ideal and the mailer needs to be adjusted, it is likely that only a new mailer can be used for reinstallation, or that the mailer is attempted to be peeled from the viewing structure against the adhesive force of the high-strength double-sided tape and attached, fastened again, with the risk of an acceptable degradation in imaging quality. That is, the existing installation method of the Mylar film in the vision system has the defects of high installation difficulty and low fault tolerance, and further has high installation cost.

Second, as described above, after the mylar film is adhered to the viewing structure, the method also requires the use of a large number of metal battens to further enable the mirror film to be fastened to the viewing structure. This increases the difficulty of design, manufacture and integration of the virtual image structure.

Some technological improvements have been made to the installation of Mylar film to improve the yield of the product, for example, an apparatus for indirect attachment of Mylar film is known from CN 218111777U (publication date: 12/23/2022). In this indirect laminating device, when the coating operation, earlier with glue coating on the laminating thing, then laminate the Mylar film on the laminating thing that is coated with glue, avoided directly coating the Mylar film on the Mylar film and probably caused Mylar film structure damage, improve the product yields from this to improve the rubber coating operating efficiency. However, the indirect gluing device still cannot avoid damage of the mylar film, which may occur when the mylar film is peeled off by the adhesive force against the glue when the attachment position of the mylar film is not ideal and needs to be adjusted, and the indirect gluing device is applied to the technical field of nuclear detection.

For another example, a film virtual image surface shape adjustment mechanism of a view display system is known from CN 215642022U (publication date: 2022, 1, 25 days). The adjusting mechanism can be used for adjusting the peripheral surface shape of the Mylar film under the condition of not pressing the Mylar film, so that the peripheral surface shape of the Mylar film meets the design surface shape requirement, the Mylar film utilization rate is improved, and the imaging view field of the film off-axis virtual image display system is enlarged. However, the application position adjusted by the adjustment mechanism does not relate to the mylar film itself.

A display system is also known from CN 110320666A (publication date: 10.11 in 2019), which also relates to the field of integration of virtual images of a view of a flight simulator. The display system includes an image generating unit, a projection unit, and an adjustment unit configured to change a visual distance between the eyebox and the virtual image, wherein the adjustment unit is configured to adjust the brightness of the virtual image according to the visual distance, but it does not relate to a specific installation process, system integration, and debugging efficiency.

Accordingly, there remains a desire in the art to provide an improved method of maillard film installation process that avoids or at least ameliorates at least one of the aforementioned disadvantages of existing maillard film installation methods in the design, manufacture and integration thereof.

Disclosure of Invention

The invention is based on the above task, and aims to provide a method for installing a Mylar film. In the installation method, the Mylar film is not required to be directly adhered to the matrix structure through adhesive, so that the defect that the traditional adhesive mode cannot be adjusted for the second time is avoided.

The method for installing the Mylar film according to the invention comprises the following steps:

mounting the polyurethane film to the base structure such that a first side of the polyurethane film contacts the base structure;

surface treating a second side of the polyurethane film opposite the first side; and

a mylar film is attached to the second side of the polyurethane film.

Thus, the method of installing a Mylar film according to the present invention uses a polyurethane film as an intermediate medium to indirectly connect a base structure and a Mylar film, avoiding the use of an adhesive such as a strong double sided tape to directly adhere the Mylar film to the base structure. Thus, the mailer mounting method according to the present invention enables the mailer to be peeled from the polyurethane film as an intermediate medium when, for example, the mounting position of the mailer needs to be adjusted, without resisting the adhesive force of the adhesive, thereby allowing the mounting of the mailer to be adjusted secondarily until the mounting of the mailer is expected so that the mounting position thereof does not deviate, and the surface thereof is flat, free from bubbles, and the mailer is completely adhered to the surface of the polyurethane film.

The polyurethane material for preparing the polyurethane film is an organic polymer material and is widely applied to the fields of light industry, chemical industry, electronics, textile, medical treatment, construction, building materials, automobiles, national defense, aerospace, aviation and the like due to the excellent performance of the organic polymer material.

In application, the polyurethane material has excellent shear strength and impact resistance, high mechanical strength, strong oxidation stability, flexibility and good rebound resilience. It can be suitable for adhesion between substrates with different thermal expansion coefficients, and has excellent buffering and damping properties. The polyurethane can also be suitable for the installation of a Mylar film of a virtual image display system of a flight simulator.

In particular, in the method of installing a mailer according to the present invention, no adhesive is applied between the mailer and the polyurethane film, which makes it possible to peel the mailer from the polyurethane film without resisting the adhesive force provided by the adhesive if it is necessary to adjust the fit between the mailer and the polyurethane film, reducing the risk of damaging the mailer that may occur during the adjustment of the position of the mailer.

In one non-limiting embodiment of the invention, the surface treatment of the polyurethane film is performed with an organic solvent to remove oil, dust, and/or moisture from the surface of the polyurethane film. Further, the surface of the maillard film used for an application scene such as virtual image imaging is generally coated with metal particles, such as aluminum particles.

It has been confirmed that urethane bonds and urea bonds having high cohesive energy are contained in the polyurethane cured product, which exhibit high activity and polarity, and which have excellent chemical adhesion to a maillard film having a surface coated with metal particles. Thus, after the polyurethane film is surface treated, for example to remove oil, dust and/or moisture from its surface, the dangling groups are allowed to collect on the bonding surface, thereby forming a bonding layer of high surface tension chemical bond connection between the substrates.

Therefore, in the mailer mounting method according to the present invention, after the surface of the polyurethane film is treated, the mailer coated with the metal particles on the surface of the treated second side of the polyurethane film can be attached to the polyurethane film and firmly held on the polyurethane film by the above-mentioned bonding layer connected by the high surface tension chemical bond.

Preferably, in the mylar film mounting method according to the present invention, the mylar film is fastened to the base structure to which the polyurethane film is mounted without using a pressing member such as a metal lath and with the aid of a fastener. Therefore, the number of components, particularly the number of metal pressing plates, used by the Mylar film mounting method is reduced, so that the steps required for perforating on a base structure and keeping the pressing piece and the Mylar film attached to the base structure by using the fastener can be correspondingly reduced, the Mylar film mounting method is simplified, the number of the components used is reduced, the mounting efficiency and the integration efficiency of the Mylar film are improved, and the design cost and the design difficulty are reduced.

In one embodiment of the mylar film installation method of the present invention, the base structure is a virtual view cavity structure for a flight simulator. The method according to the invention thus achieves a firm bonding of the mylar film with the virtual view structure of the flight simulator without the use of an adhesive such as a double sided adhesive between them.

In one non-limiting embodiment of the invention, the polyurethane film is bonded to the upper and lower edges of the base structure by an adhesive such as a high strength structural adhesive. Here, the upper and lower edges of the base structure refer to two edges of the base structure parallel to the length direction or the extension direction thereof.

In order to ensure the attachment effect of the mailer film, in a preferred embodiment of the invention, the mailer film is first pre-placed on the base structure and spread out, and the attachment of the mailer film is then carried out from one end to the other end of the longitudinal direction of the base structure, that is to say along the length of the base structure. In this process, in order to ensure that the mailer film is attached to the polyurethane film already bonded to the base structure as uniformly as possible, the attachment of the mailer film should be performed synchronously with respect to the upper and lower edges of the base structure along the length direction of the mailer film.

In the mylar film mounting method according to the present invention, after attaching the mylar film to the surface of the polyurethane film, the base structure to which the mylar film is attached is allowed to stand, preferably for twelve hours or more. Then, vacuum is applied to the Mylar film by means of a negative pressure device until the Mylar film reaches a standard depth.

In order to prevent bursting of the Mylar film during the evacuation, the negative pressure is applied at least twice.

In a particularly preferred embodiment of the invention, the negative pressure is applied in four separate applications. The first application was such that the depth of the mylar film was evacuated to one third of the design depth. The second application vacuumizes the depth of the mylar to one half of the design depth. The third application vacuumizes the depth of the mylar to two-thirds of the design depth. The last application vacuumizes the depth of the mylar to a full standard depth.

In a non-limiting embodiment of the invention, after the mylar film is evacuated, the base structure to which the mylar film has been attached is allowed to stand again, preferably for twenty-four hours or more. Next, the effect of attaching the mylar film was examined. The test item is, for example, the depth of the mylar film and the tightness of the mylar film.

In a preferred embodiment of the method according to the invention, when the test result does not reach the predetermined criterion, the mylar film is peeled off the surface of the polyurethane film and the above steps are repeated starting from the surface treatment of the polyurethane film until the test result of the mylar film reaches the predetermined prescribed value.

Thus, the present invention proposes a method for installing a mylar film using a polyurethane film as an intermediate medium for integrating the mylar film installation into a virtual view display system such as a flight simulator. The Mylar film installation method can effectively reduce the structural design difficulty and the installation cost of the virtual image display system, avoid the defect that secondary adjustment is difficult to perform due to the use of an adhesive mode, improve the system integration and debugging efficiency, and have higher fault tolerance rate in the Mylar film installation process.

The invention also provides a visual virtual image display system of the flight simulator, which comprises a visual virtual image cavity structure. And a Mylar film installed according to any scheme is arranged on the claimed visual virtual image cavity structure.

The manufacturing method of the visual virtual image display system is simple, the production and integration efficiency is high, the number of required parts is reduced, and the yield is high.

In a preferred embodiment of the present invention, no metal hold down strips are used in the claimed virtual view display system to hold the mylar film fixed to the virtual view cavity structure. Thus, in the virtual view image display system according to the present invention, since the metal lath is not used, the overall weight of the display system can be significantly reduced, and the load borne by the motion system can be reduced. Furthermore, as the metal batten plate is not used for keeping the Mylar film fixed, the hole on the structure of the virtual view cavity is not needed and the embedded part is used for matching with the metal batten plate. Thus, the manufacturing and integration flow of the virtual view display system is further simplified.

Drawings

The above technical features and other advantages of the present invention will become apparent from the following description of embodiments, which are intended to be illustrative rather than limiting, with reference to the accompanying drawings.

Fig. 1 shows a flowchart of a method of installing a mylar film according to an embodiment of the invention; and

fig. 2 schematically shows in perspective view a virtual cavity structure with a mylar film mounted according to the method of the invention.

List of reference numerals:

e1 First end portion

E2 Second end portion

K1 Upper edge

K2 Lower edge of

101-112 steps.

Detailed Description

While the invention will be described in conjunction with the exemplary embodiments, those skilled in the art will appreciate that the present description is not intended to limit the invention to such exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiment but also various alternatives, modifications, equivalents, and the like, which may be included within the spirit and scope of the invention as defined by the appended claims.

For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures, unless otherwise indicated.

According to the installation method, the polyurethane film made of polyurethane materials is used as an intermediate medium for connecting the virtual view cavity structure and the Mylar film.

Next, an embodiment of a mylar mounting method according to the present invention is explained with reference to fig. 1 and 2.

Turning to fig. 1, a flow chart of the installation method is shown in fig. 1.

As can be seen in fig. 1, a mylar film of suitable shape and size is first pre-cut at step 101 according to design data of a virtual view display system of a flight simulator, and a certain margin of operation is left around the mylar film.

In this case, the size of the operation margin to be set aside may be empirically determined by a worker who performs the pre-cutting.

The mirror cavities in the video Jing Xuxiang display system are then surface treated at step 102 according to methods known in the art. The methods employed for this surface treatment are known in the art and are therefore not explained in more detail here for the sake of clarity.

Next, a film made of polyurethane is stuck to the mirror cavity subjected to the surface treatment at step 103.

Specifically, the polyurethane film is bonded with the upper edge K1 and the lower edge K2 of the virtual view cavity structure through high-strength structural adhesive. Thus, one side, for example the first side, of the polyurethane film is attached to the virtual view cavity structure.

Next, the mylar film is pre-installed at step 104 by: the mylar film pre-cut in step 101 is placed on the virtual view cavity structure to which the polyurethane film has been attached such that the mylar film can be unfolded from the first end E1 of the virtual view cavity structure in the longitudinal direction, i.e. the extension direction of the virtual view cavity structure, towards the second end E2.

The polyurethane film, and in particular its second surface opposite the first surface, that is adhered to the virtual cavity structure is then surface treated at step 105 so that a firm bond with the mylar film can be formed later at step 106.

In this example, the surface treatment of the polyurethane film was performed with an organic solvent in order to remove oil, dust and moisture from the surface of the polyurethane film.

Next, at step 106, a mylar film is attached to the surface treated polyurethane film. The attachment of the mylar film is started from a first end E1 of the virtual view cavity structure and is performed synchronously at an upper edge K1 and a lower edge K2 of the virtual view cavity structure, for example by two operators, simultaneously, until a second end E2 of the virtual view cavity structure opposite to the first end E1 in the longitudinal direction.

Here, the firm adhesion between the mylar film and the surface treated polyurethane film is a material-fitted connection formed by the high surface tension chemical bond connection between the surface treated polyurethane film and the surface of the mylar film as described above.

The surface of the mylar film is coated with metal particles, for example aluminum particles.

Further, in the process of attaching the mylar film to the polyurethane film in step 106, when the attachment of the mylar film is not expected and thus the installation of the mylar film needs to be adjusted, the installer may directly peel the mylar film from the polyurethane film and reinstall, i.e., reattach, the mylar film until the mylar film is adjusted in place.

The mailer film being adjusted in place means that the mailer film is mounted such that its mounting position does not deviate, its surface is flat, no bubbles are present, and it is completely adhered to the surface of the polyurethane film.

It has been confirmed that in this step, the peeling force required to peel the mailer film from the surface of the polyurethane film is small, particularly smaller than that required in the prior art against the adhesive force of the strong double-sided tape used for attaching the mailer film, and also does not cause damage to the mailer film during peeling.

At step 107, the combined structure of the mylar-polyurethane film-virtual view image cavity structure formed by adhering the mylar film to the polyurethane film is subjected to a rest for a first rest time.

The first rest time is selected by the installer according to methods known in the art or according to his experience. In this example, the first rest time was 12 hours.

After the prescribed first standing time, a negative pressure is applied to the combined structure of the mylar film-polyurethane film-virtual view image cavity structure by means of a negative pressure device at step 108, thereby evacuating.

Preferably, the application of the negative pressure to the composite structure is performed in multiple passes to avoid bursting of the mylar film.

In this embodiment, the vacuum to the composite structure is pulled in four steps and is not completed until the mylar film reaches the standard depth.

Specifically, in this embodiment, the step 108 of evacuating is performed in four sub-steps 108-1 to 108-4, wherein the depth of the mirror surface is measured after evacuating during each sub-step, typically by means of a ruler with rounded corners at one end:

the sub-steps are as follows: 108-1, carrying out first vacuumizing on the combined structure to a design depth of 1/3;

the sub-steps are as follows: 108-2 performing secondary vacuumizing on the combined structure to a design depth of 1/2;

the sub-steps are as follows: 108-3 carrying out third vacuumizing on the combined structure to a design depth of 2/3; and

the sub-steps are as follows: 108-4 vacuum the composite structure a fourth time to the full design depth.

After the vacuuming step 108, the vacuumized mylar-polyurethane film-view virtual image cavity structure is again left to stand at step 109. Here, the standing is performed for a second standing time. In this embodiment, the second rest time is at least 24 hours.

After the step 109 of standing for the second standing time, the mylar film is detected at step 110.

In step 110, the test items include parameters that can be used to characterize the imaging lens state, such as the tightness of the mylar film, the depth data of the mylar film, and the like.

The above-described test at step 110 is manually measured and verified by the installer of the mylar film with the aid of a tool.

If the detection result is not acceptable, for example, when the actual measurement depth of the mylar film does not reach a predetermined target depth, or when the sealability of the mylar film does not reach a standard, the mylar film may need to be reinstalled.

In this regard, from step 105, the mylar film is peeled off, and the surface of the polyurethane film from which the mylar film was peeled off is again subjected to surface treatment with, for example, an organic solvent, and the mylar film is reattached to the surface of the polyurethane film at step 106. Thereafter, the method goes through the steps of standing in step 107, vacuumizing in step 108, standing in step 109, and detecting again in step 110. If the actual measured depth of the mylar film has not reached the target depth, or if the tightness of the mylar film has not been acceptable, the above steps 105 to 110 have to be repeated again until the above parameters or values, which characterize the installation effect of the mylar film, detected at step 110 reach the predetermined target parameters or values.

If the detection result at step 110 is qualified, i.e. the imaging lens state is normal, then after the imaging lens state is stable, the remainder is cut at step 111, mainly the remainder left when the mylar film is pre-cut at step 101.

Finally, the structure of the maillard film-polyurethane film-virtual view image cavity structure is end-face processed and fixed at step 112.

To this end, the installation of the mylar film to the base structure, i.e., the virtual view cavity structure, according to the installation method of the present invention is completed.

Thus, the mylar film installation method according to the present invention uses a polyurethane film as an intermediate dielectric material to connect the virtual view cavity structure and the mylar film for a flight simulator without using the prior art installation method of directly applying glue to install the mylar film to the virtual view cavity structure. The maillard film installation method according to the invention thus simplifies the specific installation method compared to the prior art.

Furthermore, in the Mylar film installation method, the attaching position of the Mylar film and the polyurethane film can be repeatedly adjusted without damaging the Mylar film, and the defect that the Mylar film cannot be secondarily adjusted in the traditional mode of gluing by using adhesive is avoided.

Additionally, as described above, it has been confirmed that the peeling force required to peel the mylar film from the polyurethane film to perform, for example, adjustment is small, and thus, the mylar film mounting method according to the present invention is easy to handle.

In particular, in the mylar film installation method according to the present invention, the mylar film can be firmly attached to the polyurethane film by surface-treating the polyurethane film without using the metal battens mentioned at the beginning of the present application to reinforce the mylar film, which makes it possible to reduce the number of metal battens used according to the installation method of the present invention, and thus to significantly reduce the load weight of the motion system, and thus to reduce the weight of the entire flight simulator platform.

Additionally, it has also been demonstrated that under the mailer mounting method according to the present invention, the bondability of the attachment between the mailer and the polyurethane film becomes stronger over time, thereby enabling the mailer to be held securely at the polyurethane film without the cooperation of the metal hold-down plate and the fastener, and at the same time, the adhesion still maintains the advantage of the small peel force required to peel the mailer from the polyurethane film as described above.

Further, in the mylar mounting method according to the present invention, since the metal lath is not used any more, the opening in the virtual view structure can be reduced, and thus the use of the embedded part can be reduced. This can reduce the design cost and manufacturing cost of the entire structure and improve the efficiency of integration and debugging.

Further, the mailer mounted according to the mailer mounting method of the present invention is excellent in sealability.

The present invention can freely combine the embodiments within the scope thereof.

Claims (10)

1. A method for installing a mylar film, the method comprising the steps of:

mounting the polyurethane film to a base structure such that a first side of the polyurethane film contacts the base structure;

surface treating a second side of the polyurethane film opposite the first side;

a mylar film is attached to the second side of the polyurethane film.

2. The method of claim 1, wherein the surface treatment of the polyurethane film is performed by means of an organic solvent to remove oil, dust, and/or moisture from the surface of the polyurethane film, and wherein the mylar film is for a virtual view image, the surface of which is coated with metal particles.

3. The method according to claim 2, wherein the attaching of the mylar film is performed in a longitudinal direction from the first end (E1) of the base structure to the second end (E2) of the base structure and is performed simultaneously at the upper edge (K1) of the base structure and the lower edge (K2) of the base structure.

4. A method as claimed in claim 3, wherein the base structure is a virtual view cavity structure for a flight simulator.

5. The method of claim 4, further comprising applying a negative pressure vacuum to the mylar film after attaching the mylar film to the second side of the polyurethane film, the negative pressure applied at least twice.

6. The method of claim 5, wherein the negative pressure is applied in four applications, wherein the first application of negative pressure causes evacuation to one third of the design depth, the second application of negative pressure causes evacuation to one half of the design depth, the third application of negative pressure causes evacuation to two thirds of the design depth, and the fourth application of negative pressure causes evacuation to the standard depth.

7. The method of claim 5 or 6, wherein the depth of the mylar film and the tightness of the mylar film are checked after the vacuum is applied.

8. The method of claim 7, wherein the mylar film is peeled from the polyurethane film when the test result is not expected, the polyurethane film is subjected to the surface treatment again, and the mylar film is reattached.

9. A virtual view display system for a flight simulator, characterized in that the display system has a virtual view cavity structure, which is fitted with a mylar film according to the method of any of claims 1 to 8.

10. The display system of claim 9, wherein the mylar film is reinforced without using metal battens in the virtual view cavity structure.