SMT correction sheet

Abstract

The utility model discloses an SMT correction sheet, which comprises a reflecting film layer, a chromium nitrogen oxide shading layer, a base layer and a toughened glass base layer which are sequentially arranged from top to bottom, the thickness of the reflecting film layer is 34-36nm, the thickness of the chromium nitrogen oxide shading layer is 45-47nm, and the thickness of the base layer is 19-21nm. Therefore, by means of the structure, the light reflection can be reduced, and patterns can be conveniently captured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic assembly, in particular to an SMT correction sheet. Background Art

[0002] As we all know, SMT is a surface mounting technology in the electronic assembly industry, and the calibration sheet is mainly an accessory part used in the surface mounting technology. The existing SMT calibration sheets in my country generally only include a pattern layer and a glass substrate layer from top to bottom, but because a transparent glass substrate is used, the devices around the calibration sheet are easily captured, and the surface of the calibration sheet is highly reflective, which is not conducive to practical use.

[0003] Therefore, there is an urgent need for an SMT correction sheet to solve the above problems. Utility Model Content

[0004] The utility model aims at solving the current technical deficiencies and provides an SMT correction sheet.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0006] A SMT correction sheet comprises a reflective film layer, a chromium nitride shading layer, a base layer and a tempered glass base layer which are arranged in sequence from top to bottom. The thickness of the reflective film layer is 34-36nm, the thickness of the chromium nitride shading layer is 45-47nm, and the thickness of the base layer is 19-21nm.

[0007] As a further improvement, the reflectivity of the front side of the SMT correction sheet is 9%-11%, and the wavelength of the front side of the SMT correction sheet is 420-460nm.

[0008] As a further improvement, the reflectivity of the back side of the SMT correction sheet is greater than 50%, and the wavelength of the back side of the SMT correction sheet is 430-450nm.

[0009] As a further improvement, the light transmittance of the tempered glass substrate is 89%-91%.

[0010] As a further improvement, the reflectivity of the tempered glass substrate is 7%-9%, and the refractive index is 1-2.

[0011] As a further improvement, the size of the tempered glass substrate is 3-7 inches.

[0012] As a further improvement, the optical density of the SMT correction sheet is 3-3.5.

[0013] As a further improvement, a white adhesive film layer is also provided at the bottom of the tempered glass substrate.

[0014] Beneficial effects of the utility model: The SMT correction sheet of the utility model comprises a reflective film layer, a chromium nitrogen oxide light shielding layer, a base layer and a tempered glass base layer arranged in sequence from top to bottom, the thickness of the reflective film layer is 34-36nm, the thickness of the chromium nitrogen oxide light shielding layer is 45-47nm, and the thickness of the base layer is 19-21nm. Therefore, the utility model can achieve the advantages of reducing reflection and facilitating the capture of patterns through the above structure.

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the SMT correction sheet of the utility model. DETAILED DESCRIPTION

[0017] The following description is only a preferred embodiment of the present invention and does not limit the protection scope of the present invention.

[0018] Please refer to Figure 1 The SMT calibration sheet 100 of the present invention comprises a reflective film layer 10, a chromium nitride oxide light shielding layer 20, a base layer 30 and a tempered glass base layer 40 arranged in sequence from top to bottom. The thickness of the reflective film layer 10 is 34-36nm, the thickness of the chromium nitride oxide light shielding layer 20 is 45-47nm, and the thickness of the base layer 30 is 19-21nm. For example, a white adhesive film layer 50 is also arranged at the bottom of the tempered glass base layer 40.

[0019] Please continue to refer to Figure 1 The reflectivity of the front side of the SMT correction sheet 100 of the utility model is 9%-11%, and the wavelength of the front side of the SMT correction sheet 100 is 420-460nm. The reflectivity of the back side of the SMT correction sheet 100 is greater than 50%, and the wavelength of the back side of the SMT correction sheet 100 is 430-450nm.

[0020] Please continue to refer to Figure 1 The light transmittance of the tempered glass substrate 40 is 89%-91%. Specifically, the reflectivity of the tempered glass substrate 40 is 7%-9%, and the refractive index is 1-2. More specifically, the size of the tempered glass substrate 40 is 3-7 inches. Preferably, the refractive index of the tempered glass substrate 40 is 1.52.

[0021] It is worth noting that the optical density of the SMT calibration sheet 100 is 3-3.5.

[0022] The following is the production process of the SMT calibration sheet 100 of the utility model: the first step is to select tempered glass that meets the requirements, and the tempered glass must meet the following requirements: light transmittance is 89%-91%, reflectivity is 7%-9%, refractive index is 1-2, softening point is 730±3℃, and size is 3-7 inches; the second step is to place the tempered glass in ultrasonic cleaning, soak it with alkaline cleaning solution, clean it, slowly pull it and dry it. After drying, there are no visible bubbles, scratches, broken surfaces, and cracks on the surface, and there are no scratches larger than 3μm*6mm. , the particles larger than 1μm are also zero standard quality inspection, and then stand still to wait for coating; the third step is to provide a chromium target, evacuate the magnetron sputtering coating machine, the vacuum degree reaches 2.5E-3Pa, the power is 5500-7000W, the temperature is 100-200°, and the ratio of N:O is 10:1-11:1, and the base layer 30 is deposited, in which the mass proportion of chromium is 60-92%, the mass proportion of nitrogen is 4-27%, and the mass proportion of oxygen is 3-6%. The film thickness of the base layer 30 is 19-21nm; the fourth step is through The reciprocating coating process deposits a nitride shading layer on the base layer 30, the vacuum degree reaches 2.5E-3Pa, the power is 5500-7000W, the temperature is 100-200°, the ratio of N:Ar is 10:1-9:1, the mass proportion of chromium is 72-95%, the mass proportion of nitrogen is 4-27%, and the film thickness of the nitride shading layer is 45-47nm; the fifth step is to deposit a reflective film layer 10 on the nitride shading layer by a reciprocating coating process, the vacuum degree reaches 2.5E-3Pa, the power is 5 500-7000W, temperature 100-200°, the ratio of N:O is 10:1-9:1, of which chromium accounts for 69-92% by mass, nitrogen accounts for 5-30% by mass, oxygen accounts for 2-5% by mass, and the thickness of the reflective film layer 10 is 34-36nm; Step 6, spin-coat a layer of photosensitive adhesive on the surface of the qualified product, move it to the etching workshop, and obtain the SMT calibration sheet 100 after exposure, development and degumming processes, cut the white backing film of the same size as the SMT board and stick it on the glass surface, and the whole preparation process is completed.

[0023] Beneficial effects of the utility model: The SMT calibration sheet 100 of the utility model comprises a reflective film layer 10, a chromium nitride oxide light shielding layer 20, a base layer 30 and a tempered glass base layer 40 arranged in sequence from top to bottom, the thickness of the reflective film layer 10 is 34-36nm, the thickness of the chromium nitride oxide light shielding layer 20 is 45-47nm, and the thickness of the base layer 30 is 19-21nm. Therefore, the utility model can achieve the advantages of reducing reflection and facilitating the capture of patterns through the above structure.

[0024] The present invention is not limited to the above-mentioned embodiments. Other SMT correction sheets obtained by using the same or similar structures or devices as the above-mentioned embodiments of the present invention are all within the protection scope of the present invention.

Claims

1. An SMT calibration sheet, characterized in that: It includes a reflective film layer, a chromium nitride oxide shading layer, a base layer and a tempered glass base layer arranged in sequence from top to bottom. The thickness of the reflective film layer is 34-36nm, the thickness of the chromium nitride oxide shading layer is 45-47nm, and the thickness of the base layer is 19-21nm.

2. The SMT correction sheet according to claim 1, characterized in that: The reflectivity of the front side of the SMT correction sheet is 9%-11%, and the wavelength of the front side of the SMT correction sheet is 420-460nm.

3. The SMT correction sheet according to claim 2, characterized in that: The reflectivity of the back side of the SMT correction sheet is greater than 50%, and the wavelength of the back side of the SMT correction sheet is 430-450nm.

4. The SMT correction sheet according to claim 1, characterized in that: The light transmittance of the tempered glass substrate is 89%-91%.

5. The SMT correction sheet according to claim 4, characterized in that: The reflectivity of the tempered glass substrate is 7%-9%, and the refractive index is 1-2.

6. The SMT correction sheet according to claim 5, characterized in that: The size of the tempered glass substrate is 3-7 inches.

7. The SMT correction sheet according to claim 1, characterized in that: The optical density of the SMT calibration sheet is 3-3.

5.

8. The SMT correction sheet according to claim 1, characterized in that: A white adhesive film layer is also arranged at the bottom of the tempered glass substrate.

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