Point light source focusing irradiation device

Abstract

The invention discloses a point light source focusing irradiation device which is provided with a concave lens, a point light source, a convex lens and a to-be-irradiated area which are sequentially arranged from left to right. The central axis of the concave lens and the central axis of the convex lens are collinear, and a reflection coating is arranged on the concave arc face of the left side of the concave lens. The point light source is placed near the right focus of the concave lens, is refracted and reflected by the concave lens to form parallel light, and then is refracted by the convex lens and focused to a to-be-irradiated area near the right focus of the convex lens. And the concave lens and the convex lens are made of TTA and UC materials. According to the invention, a visible light point light source can be converted into ultraviolet light for focusing, and the temperature required by element bonding or chip photoetching can be automatically controlled.

Description

Technical Field

[0001] The invention relates to a combination device of a light source and a lens. Background Art

[0002] A point light source is idealized as a point mass, emitting light with anisotropic divergence. A parallel light source, also known as directional light, is a set of parallel light rays, producing a cylindrical, parallel illumination area. Point light sources are similar to ordinary light bulbs and are primarily used for spatial illumination; parallel light is primarily used to simulate sunlight, searchlights, laser beams, and other applications. Currently, it is difficult to use point light sources to illuminate delicate objects and achieve high illumination intensity.

[0003] Invention application number 202310325512.4 discloses a high-beam module, headlamp, and vehicle. The high-beam module includes a light source, a reflector, a concave lens, and a convex lens. The reflector has a reflective surface, the light source faces the reflective surface, and the concave lens, convex lens, and reflector are arranged along a first direction, with the concave lens and convex lens located on the same side of the reflector. This invention has a large number of mirrors, making the connection and assembly relatively complex. This also affects the illumination intensity due to light attenuation.

[0004] A research team at Kyushu University has developed a TTA-UC material that can convert visible light into ultraviolet light with an efficiency of 20.5%, double that of conventional materials. The conversion of visible light into ultraviolet light requires specific physical mechanisms or technical means, primarily based on the principles of energy conversion or frequency boosting. This conversion of visible light into ultraviolet light is primarily achieved through photon upconversion technology. TTA-UC technology, in particular, involves two main processes: triplet-triplet quenching (TTA) and energy upconversion.

[0005] The following is the content displayed by DEEPSEEK search for the composition and physical state of TTA-UC triplet materials.

[0006] 1. Material composition and physical state: The core materials of the TTA-UC system mainly include two categories: (1) **Photosensitizer**: such as platinum porphyrin, iridium complex or organic molecules (anthracene derivatives, etc.); **State**: Metal complexes and most organic molecules are **solid powders** or crystals** at room temperature (melting point is usually higher than room temperature).

[0007] (2) **Acceptor**: such as rubrene, tetracene, etc. **State**: mostly **solid** (melting point above 100°C).

[0008] 2. Material form in practical application: Although the core material itself is solid, its actual application form may vary depending on the system design: **Solid state system**: Disperse photosensitizer and acceptor in **solid matrix** (such as polymer film, nanoparticles, metal organic framework MOFs) to form solid composite material.

[0009] **Liquid system**: Dissolve photosensitizer and acceptor in **organic solvent** (such as toluene, tetrahydrofuran) or ionic liquid to form homogeneous solution.

[0010] In November 2019, "Liquid lens research and development analysis" published in "Applied Optics", introduces the structure and manufacturing method of a kind of liquid lens, "Liquid filled type adjustable focus liquid lens" published in "Optical Technology" in May 2011, introduces the structure and manufacturing method of another kind of liquid lens, which can be used for reference. SUMMARY

[0011] Invention purposes: To provide a point light source focusing irradiation device which can convert point light source into focused ultraviolet light, and has large illumination and few optical devices.

[0012] Technical scheme: The application discloses a point light source focusing irradiation device, which is provided with a concave lens (single concave or double concave), a point light source, a convex lens (single convex or double convex) and a to-be-irradiated area (which can place microelectronic components) arranged in sequence from left to right.

[0013] The center axes of the concave lens and the convex lens are collinear, and the left concave surface of the concave lens is provided with a reflective coating (the light path is different from that of a plane and a concave surface, and the light path is also different from that of a double concave mirror, that is, the light is first refracted and emitted from the first concave surface (the right concave surface), then is refracted and emitted from the second concave surface (the left concave surface), then is reflected by the coating, then is refracted and emitted again, and finally is refracted and emitted from the first concave surface (the right concave surface). Of course, the coating is thin, and the slight difference in the light path is difficult to be distinguished by naked eyes), if the thickness of the coating is not considered, the left concave surface is refracted and reflected synchronously, so that the light is returned at a change angle different from that of a plane mirror, a better light condensing effect is generated, and the resolution of the irradiated component is further improved; the right side can refract and transmit.

[0014] The point light source is placed near the right focal point of the concave lens (the focal length of the double concave surface is smaller than that of the single concave surface, and preferably at the right focal point of the concave lens), and parallel reflected light can be generated. A light shield can be arranged between the point light source and the convex lens (or the point light source only irradiates the left concave lens), which does not directly irradiate the convex lens, and can directly irradiate the concave lens. The irradiation area is placed near the right focal point of the convex lens (the focal length of the double convex surface is smaller than that of the single convex surface, and preferably at the right focal point of the convex lens), and the parallel reflected light is focused near the right focal point of the convex lens after being refracted by the double convex surface of the convex lens.

[0015] The convex lens has a converging effect on light, which can converge the divergent ultraviolet light to a focal point or a small area, forming a high-energy-density light spot. In the ultraviolet curing (such as UV glue, UV ink) or photolithography process, the ultraviolet light is focused by the convex lens, which can quickly generate high-intensity energy in a local area, accelerate the chemical reaction (such as curing or exposure) of photosensitive materials, and realize high-precision processing (such as micro-pattern etching in chip manufacturing). However, the traditional ultraviolet light needs to be generated by a special ultraviolet light source.

[0016] In the present application, the concave lens and the convex lens are made of TTA-UC material. Preferably, the concave lens and the convex lens are made of TTA-UC solid material dissolved in toluene or tetrahydrofuran organic solvent or ionic liquid to form a homogeneous solution, one side is an elastic film, the other side is a flat glass packaging, and both ends have packaging components (providing the inlet and outlet of TTA-UC material and the shaping of the concave lens and the convex lens). One of the two structures described in the papers constituting the similar background art.

[0017] The present application not only refracts the point light source into parallel light and then focuses it into point light, but also converts the divergent visible light into point ultraviolet light.

[0018] Preferably, the present application also has a temperature sensor and a self-control device. The temperature sensor measures the temperature of the element in the irradiation area and transmits it to the self-control device. The self-control device connects and controls the irradiation intensity or duration of the point light source, so that the bonding glue on the element is cured or the photoresist on the chip is etched.

[0019] Illumination process: The point light source generates visible light, which is irradiated to the left through the right concave arc surface of the concave lens, and then is irradiated to the left concave arc surface. After refraction and reflection of the left concave arc surface, the light is transmitted from the right concave arc surface, and the point light is refracted into substantially parallel light. Then it is irradiated to the left convex arc surface of the convex lens, and then is transmitted through the right convex arc surface; finally, it is focused near the irradiation area. In the process of reflection and refraction, the visible light is converted into ultraviolet light by the TTA-UC triplet state material. The focused ultraviolet light can cure the bonding glue of the electronic element near the irradiation area or etch the photoresist on the chip.

[0020] Advantages: The application can focus the light rays of point light source to the irradiated area, such as the irradiation of microelectronic components, so that the illumination is strengthened, there is almost no wasted illumination around, the irradiation intensity is greatly improved, and the micro components can be clearly identified, especially suitable for visual detection system.

[0021] The concave lens has the dual functions of ordinary concave lens and mirror, reduces the disadvantages of irradiation intensity decline of multi-mirror surface, and reduces the light path and illumination decay. The distance between the convex lens and the concave lens can be adjusted as needed, and the position of the irradiated area can also be adjusted without affecting the light focusing effect.

[0022] The application not only uses point light source for focusing illumination to provide illumination, but also can be used for focusing heating to warm up, and can focus visible light into ultraviolet light for electronic component bonding or even chip lithography. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a cross-sectional structure schematic diagram of the application; Figure 2 is a perspective structure schematic diagram of the application; Figure 3 is a second cross-sectional structure schematic diagram of the application; Figure 4 is a packaging structure schematic diagram of the concave lens of the application; Figure 5 is a packaging structure schematic diagram of the convex lens of the application; Figure 6 is another perspective structure schematic diagram of the convex lens of the application.

[0024] In the figure, 1-concave lens (11-left concave arc surface, 12-right concave arc surface), 2-point light source, 3-convex lens (31-left convex arc surface, 32-right convex arc surface), 4-irradiated area, 5-shading plate; 20-outer shell (support); 30-transparent plate; 40-elastic film; 50-flat glass; 60-TTA-UC material; 61-packaging component; 62-inlet and outlet. DETAILED DESCRIPTION

[0025] Example 1: As Figure 1The point light source focusing irradiation device shown has a concave lens 1, a point light source 2, a convex lens 3, and a to-be-irradiated region 4 arranged in sequence from left to right; the central axes of the concave lens 1 and the convex lens 3 are collinear; the concave lens 1 has a reflective coating on the left concave arc surface 11, which can refract and reflect; and the right side can refract and transmit.

[0026] The point light source 2 is placed near the right focal point of the concave lens 1 and can generate scattered light to irradiate the concave lens 1. The to-be-irradiated region 4 is placed near the right focal point of the convex lens 3.

[0027] Alternatively, as shown in Figure 3 , a light shield 5 can be arranged between the point light source 2 and the convex lens 3, which does not directly irradiate the convex lens 3, but can irradiate the concave lens 1.

[0028] The shell 20 can be used to enclose the whole device. The left side of the shell 20 wraps the left side of the concave lens 1, and the right side of the shell 20 is arranged at the to-be-irradiated region 4.

[0029] Example Two: Replace the concave lens 1 in Figure 2 with a semi-concave concave lens. The left reflective surface is a plane that directly reflects light without refracting effect, producing a farther focusing focal point, so that the to-be-irradiated region 4 is far away from the light source.

[0030] Example Three: As shown in Figure 4 , the concave lens 1 is made of TTA-UC solid material 60 dissolved in tetrahydrofuran organic solvent to form a homogeneous solution, both sides are elastic film 40, and both ends are packaged together with packaging components 61.

[0031] The convex lens 3 is made of TTA-UC solid material 60 dissolved in tetrahydrofuran organic solvent to form a homogeneous solution, as shown in Figure 5 . Then, one side is an elastic film 40, the other side is a flat glass 50, and both ends are packaged together with packaging components 61. Alternatively, the convex lens 3 is made of TTA-UC solid material 60 dissolved in tetrahydrofuran organic solvent to form a homogeneous solution, as shown in Figure 6 . Then, both sides are elastic film 40, and both ends are packaged together with packaging components 61.

[0032] The point light source 2 can first be dispersed and focused into parallel light, and then focused into point light. At the same time, the dispersed visible light is converted into point ultraviolet light.

[0033] In addition, there are temperature sensors and automatic control devices. The temperature sensors measure the element temperature of the to-be-irradiated region 4 and transmit it to the automatic control device. The automatic control device connects and controls the irradiation intensity or duration of the point light source 2, so that the bonding glue on the element is solidified or the photoresist on the chip is etched.

Claims

1. A point light source focusing irradiation device, comprising a concave lens (1), a point light source (2), a convex lens (3), and a location to be irradiated (4) arranged in sequence from left to right; characterized in that: The concave lens (1) or the convex lens (3) is made of TTA-UC material (60); The central axes of the concave lens (1) and the convex lens (3) are collinear, and a reflective coating is provided on the left concave arc surface (11) of the concave lens (1); The point light source (2) is placed near the right focus of the concave lens (1); The area to be irradiated (4) is placed near the right focus of the convex lens (3).

2. The point light source focusing irradiation device according to claim 1, wherein: The concave lens (1) and the convex lens (3) are made by dissolving a TTA-UC solid material (60) in an organic solvent such as toluene or tetrahydrofuran, or an ionic liquid to form a homogeneous solution, one side of which is an elastic film (40) and the other side of which is an elastic film (40) or a flat glass (50) for packaging.

3. The point light source focusing irradiation device according to claim 1 or 2, characterized in that: The housing (20) is used to enclose the structure as an integral whole. The left side of the housing (20) encloses the left side of the concave lens (1). The right side of the housing (20) is arranged at the area to be irradiated (4). The right side of the housing (20) is made of a transparent plate (30).

4. The point light source focusing irradiation device according to claim 1 or 2, characterized in that: A light shielding plate (5) is provided between the point light source (2) and the convex lens (3), or the point light source (2) is irradiated toward the concave lens (1).

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