Spectrometer and method of assembling the same

Abstract

Embodiments of the present application provide a spectrometer and an assembling method thereof. The spectrometer includes a base, a light input module, a concave mirror, a first elastic member, a diffraction grating, and an image sensing module. The base has a first positioning portion. The light input module is disposed on the base. The concave mirror is disposed on the base, wherein the concave mirror has a functional side facing the first positioning portion. The first elastic member is disposed between the base and the concave mirror, wherein an elastic force of the first elastic member causes the concave mirror to abut against the first positioning portion with the functional side. The diffraction grating is disposed on the base and corresponds to the concave mirror, wherein a functional side of the diffraction grating includes a diffraction region. The image sensing module is disposed on the base and corresponds to the diffraction grating, wherein a functional side of the image sensing module includes an image sensing region.

Description

Technical Field

[0001] This application relates to the technical field of optical measurement devices, and more particularly to a spectrometer and its assembly method. Background Technology

[0002] A spectrometer is a scientific instrument that uses optical principles to break down complex light into spectral lines. Spectrometers can observe, analyze, and process the structure and composition of substances, offering advantages such as high analytical precision, a wide measurement range, high speed, and small sample requirements. Therefore, the resolution of molecular characteristics, concentration measurement, substance identification, and astronomical spectrum measurement all require the assistance of a spectrometer. Furthermore, spectrometers are widely used in various fields, including metallurgy, geology, petrochemicals, medicine and health, environmental protection, resource and hydrological surveying, and more.

[0003] However, most existing spectrometers suffer from drawbacks such as large size, complex structure, and high cost. Therefore, miniaturization and integration of spectrometers have become the biggest challenge in their development. Summary of the Invention

[0004] This invention provides a spectrometer and its assembly method, which can reduce the size and minimize the impact of thermal expansion and contraction on optical performance.

[0005] This invention provides a spectrometer, including a base, a light input module, a first concave mirror, a first elastic element, a diffraction grating, and an image sensing module. The base has a first positioning portion. The light input module is disposed on the base. The first concave mirror is disposed on the base, wherein its functional side faces the first positioning portion. The first elastic element is disposed between the base and the first concave mirror, wherein the elastic force of the first elastic element causes the first concave mirror to rest against the first positioning portion with its functional side. The diffraction grating is disposed on the base, wherein the functional side of the diffraction grating includes a diffraction area. The image sensing module is disposed on the base, wherein the functional side of the image sensing module includes an image sensing area.

[0006] In one embodiment of the present invention, the functional side of the first concave mirror includes a collimation area and a focusing area, wherein the collimation area and the focusing area are located on the same arc surface. The collimation area is used to receive optical signals from the light input module and provide collimated light to the diffraction grating. The diffraction grating is used to separate the collimated light into multiple spectral components. The focusing area is used to focus these spectral components on the image sensing module, so that the image sensing module generates a spectral signal.

[0007] In one embodiment of the present invention, the functional side of the first concave mirror includes a first support area and an optical area. The first support area includes a first support surface and a second support surface, located on both sides of the first concave mirror. The first support area is a flat surface left during the manufacturing process of the first concave mirror. The optical area is manufactured based on the flat surface. The first support surface and the second support surface are coplanar, and the elastic force of the first elastic element is distributed between the first support surface and the second support surface.

[0008] In one embodiment of the present invention, the spectrometer further includes a second concave mirror and a second elastic element. The second concave mirror is disposed on the base. The second elastic element is disposed between the base and the second concave mirror. The elastic force of the second elastic element causes the second concave mirror to rest against the second positioning part of the base on its functional side. The first concave mirror is a collimating mirror, the second concave mirror is a focusing mirror, the light input module is optically connected to the first concave mirror, the first concave mirror is optically connected to a diffraction grating, the diffraction grating is optically connected to the second concave mirror, and the second concave mirror is optically connected to an image sensing module.

[0009] In one embodiment of the present invention, the spectrometer further includes a second elastic member disposed between the base and the diffraction grating. The functional side of the diffraction grating further includes a second bearing area, the base has a second positioning portion, and the elastic force of the second elastic member causes the diffraction grating to rest against the second positioning portion with the second bearing area.

[0010] In one embodiment of the invention, the base further has a wall forming an accommodating space. The first concave mirror, the first elastic element, and the diffraction grating are located in the accommodating space, and the light input module and the image sensing module are supported by the wall from the outside of the wall and exposed to the accommodating space.

[0011] In one embodiment of the present invention, the spectrometer further includes a fixing adhesive to fix the first elastic element to the wall or the first concave mirror.

[0012] In one embodiment of the present invention, the optical input module includes an adjustment mechanism, a slit element, and a third elastic member. The adjustment mechanism is connected between the slit element and a wall to adjust the distance between the slit element and the wall. The third elastic member is disposed between the slit element and the wall, using an elastic force to move the slit element away from or towards the wall. In another embodiment, the optical input module includes an adjustment mechanism, a slit element, and a third elastic member. The adjustment mechanism is connected between the slit element and a wall to adjust the distance between the slit element and the wall. The third elastic member is disposed between the slit element and the wall, using an elastic force to move the slit element away from or towards the wall while maintaining the aforementioned distance.

[0013] The present invention further provides a spectrometer, including a base, a light input module, a concave grating, a first elastic member, and an image sensing module. The base has a first positioning portion. The light input module is disposed on the base. The concave grating is disposed on the base, wherein its functional side faces the first positioning portion. The first elastic member is disposed between the base and the concave grating. The elastic force of the first elastic member causes the concave grating to rest against the first positioning portion with its functional side. The image sensing module is disposed on the base and corresponds to the concave grating, wherein the functional side of the image sensing module includes an image sensing area.

[0014] In one embodiment of the present invention, the spectrometer further includes a reflector disposed between the light input module and the concave grating.

[0015] The present invention also provides a method for assembling a spectrometer, comprising the following steps: Assembling the spectrometer described in the above embodiments; providing an optical signal, and causing the image sensing module to generate a spectral signal through the light input module, reflective optical element, and image sensing module; adjusting the position of the light input module and / or the image sensing module according to the spectral signal.

[0016] The present invention also provides a method for assembling a spectrometer, comprising the following steps: A base is provided, wherein the base has a first positioning portion and a second positioning portion. A light input module is disposed on the base. A concave mirror is disposed on the base such that its functional side faces the first positioning portion, wherein the functional side of the concave mirror includes a first bearing area, a collimation area, and a focusing area. The concave mirror is supported against the first positioning portion by the elastic force of a first elastic member, wherein the first elastic member is disposed between the base and the concave mirror. A diffraction grating is disposed on the base such that its functional side faces the second positioning portion, wherein the functional side of the diffraction grating includes a second bearing area and a diffraction area. The diffraction grating is supported against the second positioning portion by the elastic force of a second elastic member, wherein the second elastic member is disposed between the base and the diffraction grating. An image sensing module is disposed on the base. An optical signal is input, and the optical signal sequentially passes through the light input module, the collimation area, the diffraction area, the focusing area, and the image sensing module, causing the image sensing module to generate a spectral signal. Adjust the position of the light input module and / or image sensing module based on the spectral signal.

[0017] The present invention further provides a spectrometer, including a base, a light input module, a reflective optical element, an elastic element, and an image sensing module. The base is integrally formed and has a first positioning portion, a second positioning portion, and a third positioning portion. The light input module is disposed on the outside of the base via the first positioning portion. The reflective optical element is disposed on the inside of the base via the second positioning portion, with its functional side facing the second positioning portion, and the functional side is used to receive optical signals. The elastic element is disposed between the base and the reflective optical element, wherein the elastic force of the elastic element causes the reflective optical element to rest against the second positioning portion with its functional side facing the second positioning portion. The image sensing module is disposed on the outside of the base via the third positioning portion.

[0018] The present invention also provides a method for assembling a spectrometer, comprising the following steps: A base is provided, wherein the base is integrally formed and has a first positioning part, a second positioning part, and a third positioning part, the first positioning part and the third positioning part being located on the outer side of the base, and the second positioning part being located on the inner side of the base. A light input module is disposed on the first positioning part. A reflective optical element is disposed on the second positioning part such that the reflective optical element faces the positioning part of the base with its functional side facing the positioning part, wherein the functional side is used to receive optical signals. The reflective optical element is supported against the second positioning part by the elastic force of an elastic member, wherein the elastic member is disposed between the base and the reflective optical element. An image sensing module is disposed on the base. An optical signal is provided, and the image sensing module generates a spectral signal through the light input module, the reflective optical element, and the image sensing module. The positions of the light input module and / or the image sensing module are adjusted according to the spectral signal.

[0019] The present invention also provides a spectrometer, comprising: a base integrally formed having a first positioning part, a second positioning part, and a third positioning part; a light input element disposed on the inner side of the base via the first positioning part; a reflective optical element disposed on the inner side of the base via the second positioning part, the functional side of the reflective optical element facing the second positioning part, the functional side being used to receive optical signals; a first elastic member disposed between the base and the light input element, wherein the elastic force of the elastic member causes the light input element to rest against the first positioning part; a second elastic member disposed between the base and the reflective optical element, wherein the elastic force of the elastic member causes the reflective optical element to rest against the second positioning part on its functional side; and an image sensing module disposed on the outer side of the base via the third positioning part.

[0020] The present invention also provides a spectrometer, comprising: a base integrally formed having a first positioning part, a second positioning part, and a third positioning part; a light input module disposed on the outside of the base via the first positioning part; a reflective optical element disposed on the inside of the base via the second positioning part, the functional side of the reflective optical element facing the second positioning part, the functional side being used to receive optical signals; a first elastic member disposed between the base and the reflective optical element, wherein the elastic force of the first elastic member causes the reflective optical element to rest against the second positioning part on its functional side; an image sensor disposed on the inside of the base via the third positioning part; and a second elastic member disposed between the base and the image sensor, wherein the elastic force of the second elastic member causes the image sensor to rest against the third positioning part.

[0021] This invention provides a spectrometer, including a base, a light input module, a first concave mirror, a first elastic element, a diffraction grating, and an image sensing module. The base has a first positioning portion. The light input module is disposed on the base. The first concave mirror is disposed on the base, with its functional side facing the first positioning portion. The first elastic element is disposed between the base and the first concave mirror, wherein the elastic force of the first elastic element causes the first concave mirror to rest against the first positioning portion with its functional side. The diffraction grating is disposed on the base, wherein the functional side of the diffraction grating includes a diffraction area. The image sensing module is disposed on the base, wherein the functional side of the image sensing module includes an image sensing area. The image sensing module includes an adjustment mechanism, an image sensor, and a second elastic element. The adjustment mechanism is connected between the image sensor and the base for adjusting the distance between the image sensor and the base. The second elastic element is disposed between the image sensor and the base, and its elastic force causes the image sensor to move away from or towards the base.

[0022] Based on the above, the spectrometer and its assembly method according to the above embodiments of the present invention can achieve positioning by using the elastic force of the first elastic member to make the concave mirror rest against the first positioning part of the base with its functional side. Therefore, the assembly of the concave mirror does not require an additional mounting element, thus reducing the overall size. Furthermore, since the concave mirror rests against the first positioning part of the base with its functional side due to the elastic force of the first elastic member, even if the concave mirror expands and contracts due to temperature changes, the first elastic member can absorb the deformation of the concave mirror, so that the functional side of the concave mirror can still maintain its positioning with the first positioning part, thereby maintaining the optical effect of the concave mirror.

[0023] The following detailed description, using specific embodiments and accompanying drawings, will make it easier to understand the purpose, technical content, features, and effects achieved by this invention. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A perspective view illustrating the explosion state of a spectrometer according to an embodiment of the present invention; Figure 2 The drawing is as follows Figure 1 A three-dimensional diagram of the combined state of the spectrometer; and Figure 3 The drawing is as follows Figure 1 A cross-sectional view of the combined state of the spectrometer; Figure 4 The illustration shows a cross-sectional view of a spectrometer according to another embodiment of the present invention; Figure 5The illustration shows a cross-sectional view of a spectrometer according to another embodiment of the present invention; and Figure 6 The illustration shows a cross-sectional view of a spectrometer according to another embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Figure 1 The diagram shows an exploded perspective view of a spectrometer according to an embodiment of the present invention. Figure 2 The drawing is as follows Figure 1 A three-dimensional diagram of the assembled spectrometer. Please refer to it. Figure 1 and Figure 2 The spectrometer 100 includes a base 110, a light input module 120, a concave mirror 130, a first elastic element 140, a diffraction grating 150, and an image sensing module 160. The wavelength range of the spectrometer 100 is, for example, 200–850 nm, but can also be 380–1050 nm, 400–1050 nm, or 800–1050 nm near-infrared light (which can be used for measuring fruit sweetness and material quantity). The base 110 has a first positioning part 112 and can be integrally formed. The light input module 120 is disposed on the base 110. The concave mirror 130 is disposed on the base 110, wherein the concave mirror 130 faces the first positioning part 112 with its functional side 132. The first elastic element 140 is disposed between the base 110 and the concave mirror 130, wherein the elastic force of the first elastic element 140 causes the concave mirror 130 to rest against the first positioning part 112 with its functional side 132. A diffraction grating 150 is disposed on the base 110 and corresponds to the concave mirror 130, wherein the functional side 152 of the diffraction grating 150 includes a diffraction area 152a. An image sensing module 160 is disposed on the base 110 and corresponds to the diffraction grating 150. The functional side 162 of the image sensing module 160 includes an image sensing area 162a, on which a second-order filter 164 can be disposed as needed.

[0027] It is worth mentioning that the spectrometer 100 can achieve positioning by using the elastic force of the first elastic member 140 to make the concave mirror 130 rest against the first positioning part 112a of the base 110 with its functional side 132. Generally, it is conventional to mount optical elements such as concave mirrors using a mounting base having a first fixing part and a second fixing part. The first fixing part is used to fix the optical element, and the second fixing part is used to fix it to the base. Since the base has reserved adjustment space, allowing the second fixing part to be adjustablely fixed on the base so that the optical element can be adjusted to the optimal position, the mounting base not only occupies additional space in the spectrometer, but the spectrometer also needs to reserve additional adjustment space, making the space inefficiently utilized. Therefore, compared with the conventional method of assembling optical elements using a mounting base, the assembly of the concave mirror 130 in this embodiment does not require additional mounting base. So although the function of adjusting the concave mirror 130 is sacrificed, the space occupied by the mounting base and the space required for adjusting the mounting base can be reduced, resulting in a smaller overall size and lower cost. Furthermore, since the concave mirror 130 is supported by the elastic force of the first elastic member 140, its functional side 132 rests against the first positioning part 112 of the base 110. Therefore, even if the concave mirror 130 is subjected to thermal expansion and contraction due to temperature changes, the first elastic member 140 can absorb most of the deformation of the concave mirror 130, so that the functional side 132 of the concave mirror 130 can still maintain its positioning with the first positioning part 112, and thus maintain the optical effect of the concave mirror 130.

[0028] Furthermore, the functional side 132 of the concave mirror 130 includes a first bearing area 132a, a collimation area 132b, and a focusing area 132c. In other words, the collimation area 132b and the focusing area 132c constitute an optical region. The collimation area 132b and the focusing area 132c are located on the same arc surface. The collimation area 132b is used to receive optical signals from the light input module 120 and thereby provide collimated light to the diffraction grating 150. The diffraction grating 150 is used to separate the collimated light into multiple spectral components. The focusing area 132c is used to focus these spectral components onto the image sensing module 160, so that the image sensing module 160 generates a spectral signal. The concave mirror 130 rests against the first positioning part 112 with the first bearing area 132a. In this embodiment, the first bearing area 132a may include a first bearing surface 132a1 and a second bearing surface 132a2, located on both sides of the collimation area 132b and the focusing area 132c.

[0029] When manufacturing the concave mirror 130, a block of glass blank with a reference plane can be provided first. Then, a collimation area 132b and a focusing area 132c, which are concave on the same spherical surface, can be formed on the reference plane by diamond turning, diamond grinding, or cup-shaped diamond grinding wheel. Parts of the reference plane are left on both sides of the collimation area 132b and the focusing area 132c to serve as the first support surface 132a1 and the second support surface 132a2. It is worth mentioning that since the concave mirror 130 uses a part of the reference plane for support, and the collimation area 132b and the focusing area 132c are also processed based on the reference plane, the first support area 132a is the flat surface left by the first processing step in the manufacturing process of the concave mirror 130, and the collimation area 132b and the focusing area 132c (optical area) are made by the second processing step based on this flat surface. Therefore, compared to positioning using a surface produced by a second or subsequent machining process, this embodiment achieves the highest precision by using a flat surface from the first machining process for support, without the problem of accumulated tolerances, resulting in more accurate optical positioning. From another perspective, the concave mirror 130 rests against the first positioning part 112 of the base 110 with its functional side facing forward. Therefore, the impact of thermal expansion and contraction on the optical effect is only measured from the first support area 132a to the thickness range of the collimation area 132b and the focusing area 132c (optical area), i.e., the machining depth. Since this thickness range is much smaller than the thickness range from the collimation area 132b and the focusing area 132c (optical area) to the rear, and a larger thickness range indicates a larger volume affected by thermal expansion and contraction, the larger the volume, the more significant the dimensional changes due to thermal expansion and contraction. Therefore, compared to a support method from the rear (non-functional side), this embodiment's front-facing support method with a functional side effectively reduces the impact of thermal expansion and contraction on the optical effect.

[0030] Furthermore, the first bearing surface 132a1 and the second bearing surface 132a2 are coplanar. The elastic force of the first elastic element 140 is distributed between the first bearing surface 132a1 and the second bearing surface 132a1. Compared to a single-sided bearing and positioning method, this embodiment uses the first bearing surface 132a1 and the second bearing surface 132a1 for bearing and positioning, which is less prone to skew and makes the positioning of the concave mirror 130 more accurate. In another embodiment not shown, depending on different processes or designs, the first bearing area 132a can also be a single plane, located above or below the collimation area 132b and the focusing area 132c, which can also achieve bearing and positioning and solve the problem of deformation caused by thermal expansion and contraction. No limitation is made here.

[0031] Furthermore, the spectrometer 100 may include a second elastic element 170 disposed between the base 110 and the diffraction grating 150. The first elastic element 140 and the second elastic element 179 may be linearly deformable compressible elastomers, such as those made of elastic materials like silicone. The diffraction grating 150 is, for example, a planar grating, and its functional side 152 further includes a second support area 152b. The base 110 has a second positioning portion 114, and the elastic force of the second elastic element 170 causes the diffraction grating 150 to rest against the second positioning portion 114 with the second support area 152b. In this embodiment, the second support area 152b is located on both sides of the diffraction area 152a, and diffraction structures can be formed on both the diffraction area 152a and the second support area 152b. Since the diffraction structure is very small, even if a portion of the second support area 152b rests against the second positioning portion 114, the impact on positioning accuracy is negligible. In other words, the diffraction area 152a and the second bearing area 152b can be formed in one step during the manufacturing process by cutting with a diamond cutter (not shown), thus simultaneously achieving process simplification and positioning accuracy. Of course, in another embodiment not shown, the second bearing area 152b may not have a diffraction structure, but instead leave a flat reference surface in the second bearing area 152b, resulting in better positioning accuracy, and this is not a limitation.

[0032] More specifically, the base 110 has a wall 116 forming an accommodating space 116a. The concave mirror 130, the first elastic element 140, the diffraction grating 150, and the second elastic element 170 are all located within the accommodating space 116a. The light input module 120 and the image sensing module 160 are supported by the wall 116 from the outside and exposed within the accommodating space 116a. For example, the wall 116 may form openings 116b and 116c communicating with the accommodating space 116a to expose the light input module 120 and the image sensing module 160, respectively. A third positioning portion 118 and a fourth positioning portion 119 of the base 110 may also be formed on the wall 116 for supporting and positioning the light input module 120 and the image sensing module 160, respectively. In this embodiment, since the concave mirror 130 and the diffraction grating 150 located in the accommodating space 116a are respectively supported and positioned on the first positioning part 112 and the second positioning part 114 by the first elastic member 140 and the second elastic member 170, the accommodating space 116a does not need to be additionally enlarged to accommodate and adjust the concave mirror 130 and the diffraction grating 150, nor does it need to retain adjustment space for the concave mirror 130 and the diffraction grating 150 (the concave mirror 130 and the diffraction grating 150 can be directly adapted to the base 110). Furthermore, the light input module 120 can be moved and adjusted along the direction of arrow A1. The image sensing module 160 can be moved along the directions of arrows A2 and A3, which are perpendicular to arrow A1 and perpendicular to each other, and rotated and adjusted along the direction of arrow A4. It should be noted that the adjustment of the light input module 120 and the image sensing module 160 is equivalent; therefore, different adjustment directions for the light input module 120 and the image sensing module 160 can be given according to requirements. It is worth mentioning that, since the accommodating space 116a of the spectrometer 100 does not require additional space to accommodate the fixtures for adjusting the concave mirror 130 and the diffraction grating 150, nor does it require adjustment space for the concave mirror 130 and the diffraction grating 150, nor does it require mounting brackets for the concave mirror 130 and the diffraction grating 150, the size and manufacturing process of the spectrometer 100 are significantly reduced. Furthermore, since the light input module 120 and the image sensing module 160 are adjusted externally, using fixtures for adjustment does not affect the size of the spectrometer 100.

[0033] While the above embodiments are described using a single concave mirror 130 having both a collimation region 132b and a focusing region 132c, in another embodiment not shown, the spectrometer may employ two concave mirrors to achieve an equivalent optical configuration. For example, the spectrometer includes a first concave mirror and a second concave mirror, serving as a collimator and a focusing mirror, respectively. A light input module is optically connected to the first concave mirror, the first concave mirror is optically connected to a diffraction grating, the diffraction grating is optically connected to the second concave mirror, and the second concave mirror is optically connected to an image sensing module. Alternatively, elastic elements may be provided between the base and the first concave mirror, and between the base and the second concave mirror. The elastic force of the elastic elements causes the first and second concave mirrors to rest against two positioning portions of the base on their functional sides. Furthermore, those skilled in the art will understand that the concave mirror 130 may be replaced by other types of reflective optical elements, and this is not a limitation.

[0034] Figure 3 The drawing is as follows Figure 1 A cross-sectional view of the assembled spectrometer. Please refer to... Figure 1 and Figure 3The optical input module 120 includes an adjustment mechanism 122, a slit element 124, and a third elastic element 126. The adjustment mechanism 122 is connected between the slit element 124 and the wall 116. The third elastic element 126, for example a spring, is disposed between the slit element 124 and the wall 116, and the elastic force generated by the compression of the third elastic element 126 causes the slit element 124 to move away from the wall 116. In this embodiment, the adjustment mechanism 122 includes two screws 122a and two guide rods 122b disposed on the base 110, so as to adjust the distance between the slit element 124 and the wall 116 by means of the screws 122a. Two screw holes 116d corresponding to the two screws 122a are formed on the base 110. A through hole 124a with an inner diameter slightly larger than the outer diameter of the screw portion of the screw 122a is formed on the slit element 124, so that the screw portion of the screw 122a can pass through the through hole 124a without interference and be screwed into the screw hole 116d. Furthermore, two guide holes 124b are formed on the slit element 124 to respectively accommodate and adapt the two guide rods 122b, allowing the slit element 124 to move in a direction parallel to the two guide rods 122b. In this embodiment, the two through holes 124a and the two guide holes 124b are located at opposite corners of the slit element 124, but this is not a limitation. In another embodiment not shown, since the adjustment of the light input module 120 and the image sensing module 160 is equivalent, the adjustment mechanism 122 can also be modified to be located on the image sensing module 160 as needed, and this is not a limitation. Furthermore, in another embodiment not shown, the adjustment mechanism 122 can be modified according to requirements, and is not limited to a combination of screw 122a and guide rod 122b. For example, the two screw holes 116d on the base 110 can be replaced with screws (not shown), which pass through the through hole 124a and protrude outside the slit element 124. Then, nuts (not shown) are used to lock the screws from the outside of the slit element 124, so that the distance between the slit element 124 and the wall 116 can be adjusted by rotating the nuts.

[0035] To further illustrate the assembly method of the spectrometer 100, please refer to the following reference. Figures 1-3 The assembly method for the spectrometer 100 includes the following steps (assembly direction can be referenced). Figure 1(Assembly line of each component). First, a base 110 is provided. Next, an optical input module 120 is disposed on the base 110 from top to bottom. Then, a concave mirror 130 is disposed on the base 110 from top to bottom, such that the concave mirror 130 faces the first positioning part 112 with its functional side 132 facing the first positioning part 112. Afterward, a first elastic member 140 is disposed between the base 110 and the concave mirror 130 from top to bottom, so that the elastic force of the first elastic member 140 causes the concave mirror 130 to rest against the first positioning part 112 with the first bearing area 132. In another embodiment, the first elastic member 140 can be fixed to the concave mirror 130 with a fixing adhesive such as double-sided tape, and then the concave mirror 130 and the first elastic member 140 are disposed together from top to bottom between the base 110 and the first positioning part 112. That is to say, this embodiment does not limit the steps to be performed separately, nor does it limit the order of the steps to be exactly the same. It is worth mentioning that by fixing the first elastic element 140 to the concave mirror 130 or the base 110 with double-sided adhesive, the first elastic element 140 can be prevented from falling off the concave mirror 130 or from being displaced, which would cause the elastic force applied to the concave mirror 130 to be uneven and affect the optical effect.

[0036] Next, a diffraction grating 150 is mounted on the base 110 from top to bottom, such that the diffraction grating 150 faces the second positioning part 114 with its functional side 152 facing the second positioning part 114. Then, a second elastic member 170 is mounted from top to bottom between the base 110 and the diffraction grating 150, so that the elastic force of the second elastic member 170 allows the diffraction grating 150 to rest against the second positioning part 114 with its second bearing area 152. After the first elastic member 140 and the second elastic member 170 have positioned the concave mirror 130 and the diffraction grating 150 by their elastic force, the concave mirror 130 and the diffraction grating 150 can be held in a state where they rest against the first positioning part 112 and the second positioning part 114 respectively by applying adhesive to the concave mirror 130 and the diffraction grating 150. Afterwards, an image sensing module 160 is mounted on the base 110. In another embodiment, the second elastic member 170 may first be fixed to the diffraction grating 150 by means of double-sided tape (not shown), and then the diffraction grating 150 and the second elastic member 170 may be arranged together from top to bottom between the base 110 and the second positioning part 114.

[0037] Next, an optical signal L1 is input, which sequentially passes through the light input module 120 (converted into optical signal L2), the collimation zone 32b (collimated into optical signal L3), the diffraction zone 152a (split into optical signal L4), the focusing zone 132c (focused into optical signal L5), and the image sensing module 160, causing the image sensing module 160 to generate a spectral signal. Then, based on the state of the spectral signal, the position of the light input module 120 is adjusted along arrow A1 and / or the position of the image sensing module 160 is adjusted along arrows A2-A4, repeating the adjustment until the desired optical effect is achieved. After adjustment, the light input module 120 and / or the image sensing module 160 can be fixed with adhesive.

[0038] It should be noted that the above assembly method is described using a spectrometer 100 including a concave mirror 140 as an example. However, in another embodiment, the above assembly method can also be applied to a spectrometer including reflective optical elements such as concave gratings. For example, firstly, a base is provided, which is integrally formed and has a first positioning part, a second positioning part, and a third positioning part. The first and third positioning parts are located on the outer side of the base, and the second positioning part is located on the inner side of the base. Next, a light input module is disposed on the first positioning part. Then, a reflective optical element is disposed on the second positioning part, such that the reflective optical element faces the positioning part of the base with its functional side facing the positioning part of the base, wherein the functional side is used to receive optical signals. Then, the reflective optical element is supported on the second positioning part by the elastic force of an elastic member, wherein the elastic member is disposed between the base and the reflective optical element. Then, an image sensing module is disposed on the base. Next, an optical signal is provided, and the image sensing module generates a spectral signal through the light input module, the reflective optical element, and the image sensing module. Then, the positions of the light input module and / or the image sensing module are adjusted according to the spectral signal. Those skilled in the art will understand that the functions and structures of the above-described components can be referenced. Figures 1-3 The embodiments can be modified and implemented, and will not be described in detail here.

[0039] From another perspective, the above assembly method can also be summarized into another method for assembling a spectrometer, including the following steps. First, a base is provided, wherein the base is integrally formed and has a first positioning part, a second positioning part, and a third positioning part. The first and third positioning parts are located on the outside of the base, and the second positioning part is located on the inside of the base. Next, a light input module is disposed on the first positioning part. Then, a reflective optical element is disposed on the second positioning part, such that the reflective optical element faces the positioning part of the base with its functional side facing the positioning part of the base, wherein the functional side is used to receive optical signals. Afterward, the reflective optical element is supported on the second positioning part by the elastic force of an elastic member, wherein the elastic member is disposed between the base and the reflective optical element. Then, an image sensing module is disposed on the base. Afterward, an optical signal is provided, and the image sensing module generates a spectral signal through the light input module, the reflective optical element, and the image sensing module. Then, the position of the light input module and / or the image sensing module is adjusted according to the spectral signal. Similarly, those skilled in the art will understand that the functions and structures of the above components can be referred to... Figures 1-3 The embodiments can be modified and implemented, and will not be described in detail here.

[0040] Figure 4 The illustration shows a cross-sectional view of a spectrometer according to another embodiment of the present invention. Please refer to... Figure 4 and Figure 3 The spectrometer 200 has a similar structure to the spectrometer 100. Figure 4 The differences are only schematically illustrated, and similar components are labeled with similar numbers; further details are omitted here. Regarding the differences, spectrometer 100 includes only a single first elastic element 140 made of a single elastic material, while spectrometer 200 includes a pair of first elastic elements 240, each comprising a first washer 242, a spring 244, and a second washer 246. Spring 244 is connected to first washer 242. In this embodiment, spring 244 is normally in a compressed state. When assembling concave mirror 230, concave mirror 230 drives second washer 246, causing spring 244 to extend, so that the elastic force of spring 244 allows concave mirror 230 to rest against first positioning part 212. It should be noted that this embodiment does not limit spring 244 to a normally compressed or normally extended state, nor does it limit its implementation to the use of first washer 242 and second washer 246. Those skilled in the art can make changes according to requirements, and are not limited thereto.

[0041] Figure 5 The diagram shows a cross-sectional view of a spectrometer according to another embodiment of the present invention. Please refer to it for further information. Figure 1 , 3 The spectrometer 300 has a similar structure to the spectrometer 100. Figure 5The differences are only schematically shown, and similar components are marked with similar labels, which will not be described in detail here. Compared to the spectrometer 100, which forms a screw hole 116d on the base 110, the spectrometer 300 forms a screw hole 324a directly on the slit element 324 of the light input module 320. This allows the screw of the adjustment mechanism 322 to be screwed into the screw hole 324a and then protrude to abut against the base 310 to adjust the gap between the slit element 324 and the base 310. Furthermore, compared to the spectrometer 100, which provides a third elastic element 126 inside the slit element 124, this embodiment provides a third elastic element 326 (e.g., a spring) between the outside of the slit element 324 and the fixture 50 (or other stop structure). The elastic force generated by compressing the third elastic element 326 causes the slit element 324 to move closer to the base 310 for positioning. After positioning and subsequent adjustments are completed, the slit element 324 can be fixed with adhesive, and the fixture 50 and / or the third elastic member 326 can be removed. In another embodiment not shown, the third elastic member 326 may also be provided in other places that can abut against the slit element 324, and there is no limitation on this.

[0042] Figure 6 The illustration shows a cross-sectional view of a spectrometer according to another embodiment of the present invention. Please refer to... Figure 6 The spectrometer 400 includes a base 410, a light input module 420, a concave grating 430, a first elastic element 440, an image sensing module 460, and a second elastic element 470. The base 410 has a first positioning portion 412. The light input module 420 is disposed on the base 410. The concave grating 430 is disposed on the base 410, with its functional side 432 facing the first positioning portion 412. The first elastic element 440 is disposed between the base 410 and the concave grating 430. The elastic force of the first elastic element 440 causes the concave grating 430 to rest against the first positioning portion 412 with its functional side 432. The image sensing module 460 is disposed on the base 410 and corresponds to the concave grating 430, wherein the functional side 462 of the image sensing module 460 includes an image sensing area. The elastic force of the second elastic member 470 causes the image sensor module 460 to rest against the second positioning part 414 with its functional side 462. Due to Figure 6 Spectrometer 400 and Figure 1The assembly method of the spectrometer 100 is similar and will not be described in detail here. Furthermore, in this embodiment, the light input module 420, the concave grating 430, and the image sensing module 460 are all housed inside the base 110. The concave grating 430 and the image sensing module 460 are respectively supported by the elastic forces of the first elastic member 440 and the second elastic member 470, resting against the first positioning part 412 and the second positioning part 414. In addition, since the concave grating 430 and the image sensing module 460 are fixed and not adjustable, the light input module 420 can be adjusted using an adjustment mechanism (not shown) or directly with a six-axis adjustment fixture (not shown). It should be noted that this embodiment does not limit the light input module 420 and the image sensing module 460 to being housed inside the base 410; they can be selectively housed externally. It also does not limit the image sensing module 460 to be supported and positioned by the second elastic member 470. Of course, since the adjustment of the light input module 420 and the image sensing module 460 is equivalent, an adjustment mechanism can be provided for one or both of them as needed (see reference). Figure 1 The embodiment with spring-loaded adjustment mechanism 122 can be used, or it can be adjusted directly by a six-axis adjustment fixture and then fixed with adhesive, and these are not limited to this. In other words, the light input module 420 without adjustment mechanism can be a light input element such as a slit element, while the image sensing module 460 without adjustment mechanism can be an image sensor such as a CCD or CMOS.

[0043] Furthermore, in this embodiment, the spectrometer 400 may further include a reflector 480, disposed between the light input module 420 and the concave grating 440. During the assembly process described above, optical signals can also be input to the light input module 420, and adjustments can be made based on the optical signals received by the image sensing module 460. First, after the optical signal L6 passes through the light input module 420, the optical signal L7 is reflected by the reflector 480 into an optical signal L8, which is then sent to the concave grating 440. Next, the optical signal L8 is split into an optical signal L9 by a diffraction structure (not shown) on the concave grating 440 and sent to the image sensing module 460. At this time, the position of the light input module 420 can be adjusted according to the state of the optical signal L9 received by the image sensing module 460.

[0044] In summary, the spectrometer and its assembly method described in the above embodiments can achieve positioning by using the elastic force of the elastic member to ensure that at least one optical element rests its functional side against the first positioning part of the base. Therefore, the assembly of this at least one optical element does not require an additional mounting base, thus reducing the overall size and cost. Furthermore, since the at least one optical element rests its functional side against the positioning part of the base due to the elastic force of the elastic member, even if the at least one optical element is subjected to thermal expansion and contraction due to temperature changes, the elastic member can absorb the deformation of the at least one optical element, allowing the functional side of the at least one optical element to maintain its positioning with the positioning part, thereby maintaining the optical effect of the at least one optical element.

[0045] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are protected by this application.

Claims

1. A spectrometer, comprising: The base has a first positioning part; An optical input module is mounted on the base. A first concave mirror is assembled on the base, wherein the first concave mirror faces the first positioning part with its functional side and is adapted to the base; A first elastic element is assembled between the base and the first concave mirror, such that the first elastic element deforms along the optical axis of the first concave mirror to provide elastic force, wherein the elastic force of the first elastic element causes the first concave mirror to rest against the first positioning part on its functional side. The first concave mirror's functional side includes a first support area and an optical area. The first support area includes a first support surface and a second support surface, which are located on both sides of the first concave mirror. The first support area is a flat surface left during the manufacturing process of the first concave mirror. The optical area is manufactured based on the flat surface. The first support surface and the second support surface are coplanar. The elastic force of the first elastic element is distributed between the first support surface and the second support surface. A diffraction grating, assembled on the base, wherein the functional side of the diffraction grating includes a diffraction region; and An image sensing module is assembled on the base, wherein the functional side of the image sensing module includes an image sensing area.

2. The spectrometer of claim 1, wherein the functional side of the first concave mirror includes a collimation region and a focusing region, wherein the collimation region and the focusing region are located on the same arc surface, the collimation region is used to receive optical signals from the light input module and thereby provide collimated light to the diffraction grating, the diffraction grating is used to separate the collimated light into multiple spectral components, and the focusing region is used to focus the multiple spectral components on the image sensing module, so that the image sensing module generates a spectral signal.

3. The spectrometer as described in claim 1, further comprising: The second concave mirror is assembled onto the base; as well as A second elastic element is assembled between the base and the second concave mirror. The elastic force of the second elastic element causes the second concave mirror to rest against the second positioning part of the base on its functional side. The first concave mirror is a collimating mirror, and the second concave mirror is a focusing mirror. The light input module is optically connected to the first concave mirror, the first concave mirror is optically connected to the diffraction grating, the diffraction grating is optically connected to the second concave mirror, and the second concave mirror is optically connected to the image sensing module.

4. The spectrometer of claim 1 further includes a second elastic member assembled between the base and the diffraction grating, wherein the functional side of the diffraction grating further includes a second bearing area, the base has a second positioning portion, and the elastic force of the second elastic member causes the diffraction grating to rest against the second positioning portion with the second bearing area.

5. The spectrometer of claim 1, wherein the base further comprises a wall forming an accommodating space, wherein the first concave mirror, the first elastic element and the diffraction grating are located in the accommodating space, and wherein the light input module and the image sensing module are supported by the wall from the outside of the wall and exposed to the accommodating space.

6. The spectrometer of claim 5 further includes a fixing adhesive to fix the first elastic element to the wall or the first concave mirror.

7. The spectrometer of claim 5, wherein the light input module includes an adjustment mechanism, a slit element, and a third elastic element, wherein the adjustment mechanism is connected between the slit element and the wall to adjust the distance between the slit element and the wall, and the third elastic element is assembled between the slit element and the wall to use elastic force to move the slit element away from or closer to the wall.

8. A spectrometer, comprising: The base has a first positioning part; The optical input module is assembled on the base. A concave grating is assembled on the base, wherein the concave grating faces the first positioning part with its functional side and is adapted to the base; A first elastic element is assembled between the base and the concave grating, such that the first elastic element deforms along the optical axis of the concave grating to provide an elastic force, wherein the elastic force of the first elastic element causes the concave grating to rest against the first positioning part on its functional side. The functional side of the concave grating includes a first support area and an optical area. The first support area includes a first support surface and a second support surface, which are located on both sides of the concave grating. The first support area is a flat surface left during the manufacturing process of the concave grating. The optical area is manufactured based on the flat surface. The first support surface and the second support surface are coplanar. The elastic force of the first elastic element is distributed between the first support surface and the second support surface. An image sensing module is assembled on the base and corresponds to the concave grating, wherein the functional side of the image sensing module includes an image sensing area.

9. A spectrometer, comprising: The base is integrally formed and has a first positioning part, a second positioning part and a third positioning part; The optical input module is assembled to the outside of the base via the first positioning part; A reflective optical element is assembled on the inner side of the base via the second positioning part. The reflective optical element faces the second positioning part with its functional side facing the base and is adapted to the base. The functional side is used to receive optical signals. An elastic element is assembled between the base and the reflective optical element, such that the elastic element deforms along the optical axis of the reflective optical element to provide elastic force, wherein the elastic force of the elastic element causes the reflective optical element to rest against the second positioning part on the functional side; as well as The image sensing module is assembled on the outside of the base via the third positioning part. The functional side of the reflective optical element includes a first support area and an optical area. The first support area includes a first support surface and a second support surface, which are located on both sides of the reflective optical element. The first support area is a flat surface left during the manufacturing process of the reflective optical element. The optical area is manufactured based on the flat surface. The first support surface and the second support surface are coplanar. The elastic force of the elastic element is distributed between the first support surface and the second support surface.

10. A method for assembling a spectrometer, comprising: A base is provided, wherein the base is integrally formed and has a first positioning part, a second positioning part and a third positioning part, the first positioning part and the third positioning part being located on the outer side of the base, and the second positioning part being located on the inner side of the base; Assemble the optical input module into the first positioning part; Assemble a reflective optical element in the second positioning part, such that the reflective optical element faces the second positioning part of the base with its functional side and is adapted to the base, wherein the functional side is used to receive optical signals; The reflective optical element is supported by the elastic force of an elastic element, wherein the elastic element is assembled between the base and the reflective optical element, and the elastic element deforms along the optical axis of the reflective optical element to provide elastic force. The functional side of the reflective optical element includes a first support area and an optical area. The first support area includes a first support surface and a second support surface, which are located on both sides of the reflective optical element. The first support area is a flat surface left during the manufacturing process of the reflective optical element. The optical area is manufactured based on the flat surface. The first support surface and the second support surface are coplanar. The elastic force of the elastic element is distributed between the first support surface and the second support surface. Assemble the image sensing module onto the base; An optical signal is provided, which, through the light input module, the reflective optical element, and the image sensing module, enables the image sensing module to generate a spectral signal; as well as The position of the light input module and / or the image sensing module is adjusted according to the spectral signal.

11. A spectrometer, comprising: The base is integrally formed and has a first positioning part, a second positioning part and a third positioning part; The optical input element is assembled to the inside of the base via the first positioning part; A reflective optical element is assembled on the inner side of the base via the second positioning part. The reflective optical element faces the second positioning part with its functional side facing the base and is adapted to the base. The functional side is used to receive optical signals. A first elastic element is assembled between the base and the optical input element, such that the first elastic element deforms along the optical axis of the optical input element to provide elastic force, wherein the elastic force of the first elastic element causes the optical input element to rest against the first positioning part; A second elastic element, assembled between the base and the reflective optical element, deforms along the optical axis of the reflective optical element to provide an elastic force, wherein the elastic force of the second elastic element causes the reflective optical element to rest against the second positioning part on its functional side. The functional side of the reflective optical element includes a first bearing area and an optical area. The first bearing area includes a first bearing surface and a second bearing surface, which are located on both sides of the reflective optical element. The first bearing area is a flat surface left during the manufacturing process of the reflective optical element. The optical area is manufactured based on the flat surface. The first bearing surface and the second bearing surface are coplanar. The elastic force of the second elastic element is distributed between the first bearing surface and the second bearing surface. The image sensing module is assembled on the outside of the base via the third positioning part.

12. A spectrometer, comprising: The base is integrally formed and has a first positioning part, a second positioning part and a third positioning part; The optical input module is assembled to the outside of the base via the first positioning part; A reflective optical element is assembled on the inner side of the base via the second positioning part. The reflective optical element faces the second positioning part with its functional side facing the base and is adapted to the base. The functional side is used to receive optical signals. A first elastic element is assembled between the base and the reflective optical element, such that the first elastic element deforms along the optical axis of the reflective optical element to provide an elastic force, wherein the elastic force of the first elastic element causes the reflective optical element to rest against the second positioning part on its functional side. The functional side of the reflective optical element includes a first bearing area and an optical area. The first bearing area includes a first bearing surface and a second bearing surface, which are located on both sides of the reflective optical element. The first bearing area is a flat surface left during the manufacturing process of the reflective optical element. The optical area is manufactured based on the flat surface. The first bearing surface and the second bearing surface are coplanar. The elastic force of the first elastic element is distributed between the first bearing surface and the second bearing surface. An image sensor is assembled to the inside of the base via the third positioning part; and The second elastic member is assembled between the base and the image sensor, such that the second elastic member deforms along the optical axis of the image sensor to provide elastic force, wherein the elastic force of the second elastic member causes the image sensor to rest against the third positioning part.

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