Gluing process of polarization splitting prism diaphragm and application thereof

Abstract

The invention discloses a gluing process of a polarization splitting prism diaphragm and application of the gluing process, and relates to the technical field of gluing processes. The gluing process provided by the invention comprises the following steps: stacking a diaphragm between two prisms, and carrying out pressurization baking treatment to obtain a polarization splitting prism; the prism is a prism subjected to glue dispensing; the glue-dispensed surface of the prism is a glue-dispensed surface and is in contact with the diaphragm; the temperature of the pressurized baking is 35-65 DEG C. According to the gluing process of the polarization splitting prism, baking and pressurizing treatment is carried out under specific conditions, the temperature, pressure and time in the baking and pressurizing process are adjusted, wrinkles of the diaphragm are reduced, the glued surface achieves mirror surface flatness, and the imaging quality of the polarization splitting prism diaphragm is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gluing processes, and particularly relates to a gluing process for a polarization beam splitting prism film and its application. Background Art

[0002] In the manufacturing process of optical elements, the gluing process of a polarization beam splitting prism (PBS) film is crucial for ensuring the performance and quality of the product. In the existing film gluing technology, problems such as the optical axis deviation caused by the cutting deviation of the film, or the wrinkling phenomenon of the film after gluing and the flatness of the gluing surface caused by the difficulty in completely discharging the air bubbles in the glue layer and the dust on the gluing surface often occur, making it difficult to meet the imaging requirements of the transmission PV value ≤ 0.25λ and the reflection PV value ≤ 0.5λ. These problems will increase the scattering loss of the gluing surface of the final product and affect the imaging quality. Summary of the Invention

[0003] The present invention aims to at least solve one of the above technical problems existing in the prior art. For this purpose, the object of the present invention is to provide a gluing process for a polarization beam splitting prism film, which reduces film wrinkles and makes the gluing surface reach mirror flatness through special baking and pressure shaping treatment.

[0004] The second aspect of the present invention provides an application of the gluing process for a polarization beam splitting prism film.

[0005] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] The first aspect of the present invention provides a gluing process for a polarization beam splitting prism film, including the following steps:

[0007] Stack the films between two prisms, and perform pressure baking treatment to obtain a polarization beam splitting prism;

[0008] The prism is a prism that has been dot-glued; the surface of the prism that has been dot-glued is the dot-glued surface and is in contact with the film;

[0009] The temperature of the pressure baking is 35 - 65°C.

[0010] In some embodiments of the present invention, the temperature of the pressure baking is 40 - 60°C.

[0011] In some examples of the present invention, the temperature of the pressure baking is 45 - 55°C.

[0012] In some embodiments of the present invention, the pressure of the pressure baking is 0.3 - 0.7 MPa.

[0013] In some examples of the present invention, the pressure of the pressure baking is 0.4 - 0.6 MPa.

[0014] In some specific embodiments of the present invention, the pressure for pressure baking is 0.5 to 0.6 MPa.

[0015] In some embodiments of the present invention, the dispensing is wire dispensing; the amount of glue used during dispensing is 1 to 3 mg / mm.

[0016] Specifically, when the vertical height of the prism is 4 to 6 mm, the amount of glue used for dispensing is 3 to 15 mg.

[0017] In some embodiments of the present invention, the amount of glue used during dispensing is 1 to 2 mg / mm.

[0018] In some embodiments of the present invention, the speed of dispensing is 8 to 12 mm / s.

[0019] In some embodiments of the present invention, the minimum distance between the edge of the diaphragm and the contact point between the diaphragm and the prism is 1 to 3 mm.

[0020] Specifically, the edge of the diaphragm protrudes 1 to 3 mm from the edge of the dispensing surface of the prism.

[0021] In some embodiments of the present invention, the glue for dispensing includes a transparent optical glue.

[0022] In some embodiments of the present invention, the pressure baking treatment is carried out in a baking and pressurizing device, with pressurization and baking being carried out simultaneously.

[0023] In some embodiments of the present invention, the gluing process includes the following steps:

[0024] Take a first prism and a second prism. One side surface of the first prism and the second prism has been subjected to wire dispensing to form a dispensing surface;

[0025] Stack the first prism, the diaphragm, and the second prism in sequence in a mold; the dispensing surfaces of the first prism and the second prism are in contact with the diaphragm; after degassing and pressure baking, a polarization beam splitter prism is obtained.

[0026] Specifically, after the prism and the diaphragm are stacked, a component with the following structure is formed: the large surfaces of the two prisms that have been dispensed are opposite to each other, and the diaphragm is clamped in the middle.

[0027] In some embodiments of the present invention, the prism is a triangular prism.

[0028] In some embodiments of the present invention, the vertical height of the prism is 1 to 15 mm.

[0029] In some embodiments of the present invention, the mold includes a first mold and a second mold; the first mold includes a V-shaped groove and a positioning block, and the second mold includes a V-shaped groove.

[0030] In some embodiments of the present invention, the positioning blocks include short-side positioning blocks and long-side positioning blocks.

[0031] In some embodiments of the present invention, the first prism is placed in the V-shaped groove of the first mold and positioned by the short-side positioning blocks; a diaphragm is placed on the dispensing surface of the first prism and positioned by the short-side positioning blocks and the long-side positioning blocks; a second prism is placed on the diaphragm, and then a second mold is placed on the second prism so that the second prism fits into the V-shaped groove of the second mold.

[0032] In some specific embodiments of the present invention, after the diaphragm is placed, visually confirm that the diaphragm offset ≤ 0.1 mm.

[0033] In some embodiments of the present invention, after the pressure baking, the excess diaphragm at the edge of the polarization beam splitting prism is removed so that the flatness error between the diaphragm and the edge of the polarization beam splitting prism ≤ 0.05 mm.

[0034] In some embodiments of the present invention, the method for removing the excess diaphragm at the edge of the polarization beam splitting prism is to scrape it with a metal blade.

[0035] In some embodiments of the present invention, the position of the wire dispensing is in the middle of the contact surface between the prism and the diaphragm, parallel to the long side of the contact surface.

[0036] In some embodiments of the present invention, gluing is performed in a dust-free environment below class 1000.

[0037] Among them, class 1000 is ISO class 7.

[0038] In some embodiments of the present invention, the environmental temperature during the gluing process is 22 - 26 °C, and the environmental humidity is 40 - 60%.

[0039] The second aspect of the present invention provides an application of the gluing process of the polarization beam splitting diaphragm described in the first aspect of the present invention in the preparation of optical devices.

[0040] In some embodiments of the present invention, the optical device is a micro high-resolution optical device.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1) The gluing process of the polarization beam splitting prism of the present invention reduces diaphragm wrinkles through baking and pressurizing treatments under specific conditions, making the gluing surface reach mirror flatness, meeting the imaging requirements that the transmitted PV value of the diaphragm ≤ 0.25λ and the reflected PV value ≤ 0.5λ, and improving the imaging quality of the polarization beam splitting prism diaphragm.

[0043] 2) By adjusting the temperature, pressure, and time during the pressurized baking process, the gluing process of the present invention can further reduce the reflection PV value and transmission PV value of the polarization beam splitting prism diaphragm, reduce scattering loss, further improve the imaging quality, and meet the requirements of high-precision imaging.

[0044] 3) In the gluing process of the present invention, by controlling the protrusion amount of the diaphragm relative to the edge of the prism dispensing surface, it is beneficial to avoid the optical axis angle deviation of the polarization beam splitting prism diaphragm and the surface distortion of the diaphragm caused by cutting stress.

[0045] 4) Through process designs such as controlling a dust-free environment, using a mold for positioning, having the diaphragm protrude from the edge of the prism dispensing surface, and baking and pressurizing for shaping, the gluing process of the present invention solves the problems of uneven adhesive layer, dust on the gluing surface, residual air bubbles in the adhesive layer, cutting deformation, and insufficient surface accuracy, improves the high-precision imaging quality of the polarization beam splitting prism diaphragm, and is applicable to the mass production of micro high-resolution optical devices. Description of the Drawings

[0046] Figure 1 It is a schematic diagram of wire dispensing for the first prism 1 in Embodiment 1 of the present invention.

[0047] Figure 2 It is a schematic diagram of wire dispensing for the second prism 2 in Embodiment 1 of the present invention.

[0048] Figure 3 It is a schematic diagram of stacking PBS diaphragms in Embodiment 1 of the present invention.

[0049] Figure 4 It is a schematic diagram of discharging glue using the second mold in Embodiment 1 of the present invention.

[0050] Figure 5 It is a schematic diagram of the polarization beam splitting prism obtained in Embodiment 1 of the present invention.

[0051] The markings in the drawings are explained as follows:

[0052] 0 - Wire dispensing, 1 - First prism, 2 - Second prism, 3 - First mold, 4 - Second mold, 5 - Long side positioning block, 6 - Short side positioning block, 7 - PBS diaphragm. Detailed Embodiments

[0053] The content of the present invention will be further described in detail below through specific embodiments. The raw materials, reagents, or devices used in the embodiments and comparative examples can be obtained from conventional commercial channels or can be obtained by existing technical methods without special instructions. Unless otherwise specified, the test or measurement methods are conventional methods in the art.

[0054] The following will be described in detail with specific embodiments.

[0055] Example 1

[0056] A gluing process for a polarization beam splitting prism diaphragm, comprising the following steps:

[0057] In a thousand-class clean room, control the environmental temperature at 24±2°C and the humidity at 50±10%. First, place the first prism 1 with a vertical height of 5 mm and the second prism 2 with their large faces facing up into the first mold 3 and the second mold 4 of the V-shaped fixture respectively. Use a dispensing machine with a dispensing needle inner diameter of 0.2 mm to perform wire dispensing 0 at about 1 / 2 of the middle of the first prism 1 and the second prism 2 at a speed of 10 mm / s to form a continuous glue line, as Figure 1 and Figure 2 shown; the glue is a conventional commercially available transparent optical glue, and the net weight of the single-sided dispensing glue is 7 mg (about 1.7 mg / mm); the first prism 1 and the second prism 2 are the same triangular prism;

[0058] Place the first prism 1 that has completed dispensing into the V-shaped groove of the first mold 3 of the gluing fixture. Align the first prism 1 with the short-side positioning block 6, and the dispensing surface faces up, as Figure 3 shown;

[0059] After uncovering the protective film of the PBS diaphragm 7, place it on the first prism 1. The PBS diaphragm 7 is positioned by using the short-side positioning block 6 and the long-side positioning block 5. The edge of the PBS diaphragm protrudes 2 mm from the edge of the contact surface between the first prism 1 and the PBS diaphragm;

[0060] Place the second prism 2 on the PBS diaphragm 7, align it with the short-side positioning block 6, and place the second mold 4 to obtain the component to be glued, as Figure 4 shown;

[0061] The second mold 4 serves as a pressing block. Use its pressure to expel the air bubbles in the glue. After confirming that the air bubbles are expelled and the offset of the PBS diaphragm 7 is ≤0.1 mm, place the component to be glued into the baking and pressurizing equipment for pressurized baking treatment. Set the baking temperature at 40°C, the pressurizing pressure at 0.4 MPa, and the baking time at 2 hours;

[0062] After the pressurized baking treatment, take out the glued component and use a metal blade to scrape off the excess diaphragm along the edge of the triangular prism to make the end face of the diaphragm flush with the prism. The flatness error between the diaphragm and the prism edge after scraping is ≤0.05 mm, as Figure 5 shown; obtain the polarization beam splitting prism.

[0063] Example 2

[0064] A gluing process for a polarization beam splitting prism, the difference from Example 1 is that during the pressurized baking process, the pressurizing pressure is 0.5 MPa; the rest is the same as Example 1.

[0065] Example 3

[0066] A gluing process for a polarization beam splitting prism, which is different from that of Example 1 in that: during the pressurized baking process, the pressurizing pressure is 0.6 MPa; the rest is the same as in Example 1.

[0067] Example 4

[0068] A gluing process for a polarization beam splitting prism, which is different from that of Example 1 in that: during the pressurized baking process, the baking temperature is 50 °C; the rest is the same as in Example 1.

[0069] Example 5

[0070] A gluing process for a polarization beam splitting prism, which is different from that of Example 2 in that: during the pressurized baking process, the baking temperature is 50 °C; the rest is the same as in Example 2.

[0071] Example 6

[0072] A gluing process for a polarization beam splitting prism, which is different from that of Example 3 in that: during the pressurized baking process, the baking temperature is 50 °C; the rest is the same as in Example 3.

[0073] Example 7

[0074] A gluing process for a polarization beam splitting prism, which is different from that of Example 1 in that: during the pressurized baking process, the baking temperature is 60 °C; the rest is the same as in Example 1.

[0075] Example 8

[0076] A gluing process for a polarization beam splitting prism, which is different from that of Example 2 in that: during the pressurized baking process, the baking temperature is 60 °C; the rest is the same as in Example 2.

[0077] Example 9

[0078] A gluing process for a polarization beam splitting prism, which is different from that of Example 3 in that: during the pressurized baking process, the baking temperature is 60 °C; the rest is the same as in Example 3.

[0079] Result detection

[0080] Using a ZYGO interferometer, measure the specific PV value data of Examples 1 - 9. Each example is set with 3 parallel samples. Among them, the reflection PV control value ≤ 0.5λ, the transmission PV control value ≤ 0.25λ, and the lower the PV value, the better the imaging effect.

[0081] The test results are shown in Table 1 below.

[0082] Table 1 PV value table of the glued surface of the polarization beam splitting prism for Examples 1 - 9

[0083]

[0084]

[0085] Combined with the data in Table 1, it can be seen that the average PV value of the glued surfaces of the three parallel samples prepared in Examples 1-9 of the present invention can all meet the requirements that the reflected PV value ≤ 0.5λ and the transmitted PV value ≤ 0.25λ. Among them, compared with other examples, Example 5 has the smallest reflected PV value and transmitted PV value, better imaging quality, and the maximum fluctuation ≤ 0.03λ, and higher process stability.

[0086] In summary, the gluing process of the polarization beam splitting prism of the present invention can reduce the film wrinkles, make the glued surface reach mirror flatness, and improve the imaging quality of the polarization beam splitting prism film by performing baking and pressing treatment under specific conditions and adjusting the temperature, pressure and time during the pressing and baking process. At the same time, controlling the protrusion amount of the film relative to the edge of the prism bonding surface is beneficial to avoiding the optical axis angle deviation of the polarization beam splitting prism film and the surface shape distortion of the film caused by cutting stress. Through the process design of combining a dust-free environment, using mold positioning, the film protruding from the edge of the prism dispensing surface, and baking and pressing for shaping, the problems of uneven adhesive layer, dust on the glued surface, cutting deformation and insufficient surface shape accuracy are solved, and the high-precision imaging quality of the polarization beam splitting prism film is improved, which is suitable for mass production of miniature high-resolution optical devices.

[0087] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and shall all be included in the protection scope of the present invention.

Claims

1. A gluing process for a polarization beam splitting prism film, characterized in that, It includes the following steps: Stack the diaphragm between two prisms, and perform pressure baking treatment to obtain a polarization beam splitting prism; The prism is a prism with glue dispensing; the surface of the prism with glue dispensing is the glue dispensing surface and contacts the diaphragm; The temperature of the pressure baking is 35 - 65 °C.

2. The gluing process according to claim 1, characterized in that, The pressure of the pressure baking is 0.3 - 0.7 MPa.

3. The gluing process according to claim 1 or 2, characterized in that, The time of the pressure baking is 1 - 3 h.

4. The gluing process according to claim 1, characterized in that The glue dispensing is wire drawing glue dispensing; the amount of glue used during glue dispensing is 1 - 3 mg / mm; And / or, the speed of the glue dispensing is 8 - 12 mm / s.

5. The gluing process according to claim 1, characterized in that, The minimum distance between the edge of the diaphragm and the contact point between the diaphragm and the prism is 1 - 3 mm.

6. The gluing process according to claim 1, characterized in that, It includes the following steps: Take the first prism and the second prism. One side surface of the first prism and the second prism has been subjected to wire drawing glue dispensing to form a glue dispensing surface; Stack the first prism, the diaphragm, and the second prism in sequence in a mold; the glue dispensing surfaces of the first prism and the second prism contact the diaphragm; after degassing and pressure baking, a polarization beam splitting prism is obtained.

7. The gluing process according to claim 6, wherein After the pressure baking, remove the excess diaphragm at the edge of the polarization beam splitting prism to make the flatness error between the diaphragm and the edge of the polarization beam splitting prism ≤ 0.05 mm.

8. The gluing process according to claim 6, characterized in that, The position of the wire drawing glue dispensing is in the middle of the contact surface between the prism and the diaphragm and parallel to the long side of the contact surface.

9. The gluing process according to any one of claims 1 to 8, characterized in that, The gluing is carried out in a dust-free environment below class 1000.

10. Application of the gluing process of the polarization beam splitting diaphragm according to any one of claims 1 - 9 in the preparation of optical devices.

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