Light source device and method for efficiently adjusting light wavelength by using parallel light module comprising axicon lens

Abstract

The present invention provides a light source device and a method for efficiently integrating and collimating diffused light using a parallel light module including an axicon lens, and adjusting the wavelength of the desired light and allowing the desired light to pass therethrough. A variable wavelength light source device according to one embodiment of the present invention comprises: a diffusion light source for irradiating diffused light; the parallel light module is used for collimating light irradiated from the diffusion light source, and the parallel light module comprises an axicon lens; the angle adjusting band-pass filter module enables the light passing through the parallel light module to pass through so as to select the specific wavelength of the light; and a mixing module correcting an error of the specific wavelength according to an incident angle of the light passing through the angle adjustment band-pass filter module.

Description

Technical Field

[0001] The present invention relates to a light source device and method, which utilizes a parallel light module including an axicon lens to efficiently integrate and collimate diffused light, and adjusts the wavelength of required light to allow it to pass. Background Art

[0002] In imaging technologies or detection equipment that utilize light, specific information is obtained by analyzing the changes that occur when light is irradiated onto a specific area. Furthermore, in imaging technologies or detection equipment that utilize light, specific information is obtained by analyzing the phenomena that occur after irradiating the object with light of a specific wavelength.

[0003] That is, in the technical field to which the present invention belongs, it is necessary to irradiate linear light, and in particular, after irradiating light of a specific wavelength suitable for obtaining information from the object in a linear manner, analysis is performed to obtain information by confirming changes in transmitted or reflected light or confirming other emitted light.

[0004] In this case, when selecting light for imaging or analysis, a laser with a small divergence angle and good linearity can be used, in which the angle at which light diffuses during propagation, that is, the divergence angle, is small. However, since the laser has a single wavelength, it has the disadvantages of high cost and low efficiency in requiring multiple lasers with specific wavelengths in the visible light region of 400nm to 700nm. This problem becomes more serious as the required wavelength region expands. In order to solve the problem, a wavelength-tunable laser (Wavelength Tunable Laser) that utilizes pigments or nonlinear phenomena can also be used. However, wavelength-tunable lasers have the disadvantages of being expensive, difficult to maintain, and difficult to change.

[0005] On the other hand, relatively low-cost light sources such as ordinary lamps and light-emitting diodes (LEDs) can also be used, but making them have a wide range of wavelengths to obtain a specific wavelength will require additional effort and cost. Moreover, since the light-emitting area is relatively large and the divergence angle is large, there is a disadvantage that it is difficult to make the light linear.

[0006] More specifically, in the process of making the light emitted by ordinary lamps and light-emitting diodes have linearity, since most of the light emitted from the light source is lost, only a portion of the light emitted from a specific direction can be used, so the output is significantly reduced, and thus the efficiency is also reduced. Figure 1 , which is linear with light Figure 1 Different from part (a), when light diffuses into the air Figure 1In the case of part (b), for example, when the light source is a normal lamp or a light-emitting diode, it is difficult to convert (i.e., collimate) the light into parallel light due to aberrations generated according to the angles at which the light is diffused from multiple points, resulting in reduced efficiency.

[0007] That is, the light used in microscopes or industrial inspection equipment needs to be collimated. In this case, when the light source is an ordinary lamp or a light-emitting diode, a large amount of light will be lost during the collimation process, resulting in low efficiency.

[0008] Therefore, if Figure 2 As shown, in the microscope industry, a method called pinhole is used to use only a portion of the light source, but this method also has the disadvantage of reduced efficiency. Summary of the Invention

[0009] Technical issues

[0010] The object of the present invention is to provide a high-efficiency variable wavelength light source device and method, that is, to effectively integrate and collimate light emitted from ordinary lamps or light-emitting diodes that are inexpensive but easily lose a lot of light, and at the same time, to select the wavelength of the required light.

[0011] Technical Solution

[0012] In order to solve the above-mentioned technical problems, a variable wavelength light source device according to one embodiment of the present invention includes: a diffuse light source for irradiating diffuse light; a parallel light module for collimating the light emitted from the diffuse light source, the parallel light module including an axicon lens; an angle-adjustable bandpass filter module for allowing light passing through the parallel light module to pass through so as to select a specific wavelength of the light; and a mixing module for correcting the spatial error of a specific wavelength according to the incident angle of the light passing through the angle-adjustable bandpass filter module.

[0013] The angle-adjustable band-pass filter module may be in the form of a circular plate and include a plurality of angle-adjustable band-pass filters, wherein the plurality of angle-adjustable band-pass filters are arranged in a circular shape at the edge of the angle-adjustable band-pass filter module. According to each of the plurality of angle-adjustable band-pass filters, the selected wavelength band of light passing through the corresponding filter is different from each other. In order to select a specific wavelength band of light, the angle-adjustable band-pass filter module is rotated, thereby selecting one of the plurality of angle-adjustable band-pass filters.

[0014] The multiple angle-adjustable band-pass filters can be rotated separately to adjust the incident angle of light relative to the corresponding filter, and the wavelength of the light passing through the filter is selected differently according to the incident angle. As the angle-adjustable band-pass filter rotates, light has a specific incident angle to pass through the angle-adjustable band-pass filter selected from the multiple angle-adjustable band-pass filters, thereby selecting a specific wavelength within the selected wavelength band of light.

[0015] The variable wavelength light source device of the present invention may also include another angle-adjustable bandpass filter module, by rotating the another angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the another angle-adjustable bandpass filter module, thereby adjusting the bandwidth of the band with the specific wavelength as the center wavelength within the selected wavelength band.

[0016] An incident angle of light with respect to the angle adjustment bandpass filter may be greater than or equal to 0° and less than or equal to 90°.

[0017] The diffuse light source may be a light emitting diode (LED) or a lamp.

[0018] The hybrid module may be an optical fiber, a liquid crystal light guide, or a rod lens.

[0019] Another embodiment of the present invention provides a method for providing a variable wavelength light source, including the following steps: irradiating diffuse light through a diffuse light source; collimating the light emitted from the diffuse light source through a parallel light module, the parallel light module including an axicon lens; allowing the light passing through the parallel light module to pass through through an angle-adjustable bandpass filter module to select a specific wavelength of light; and correcting an error in the specific wavelength according to the incident angle of the light passing through the angle-adjustable bandpass filter module through a mixing module.

[0020] The method of providing a variable wavelength light source of the present invention may also include a step of rotating an angle-adjustable bandpass filter module, wherein the angle-adjustable bandpass filter module is in the form of a circular plate and includes a plurality of angle-adjustable bandpass filters, wherein the plurality of angle-adjustable bandpass filters are arranged in a circular shape at the edge of the angle-adjustable bandpass filter module. According to each of the plurality of angle-adjustable bandpass filters, the selected wavelength bands of light passing through the corresponding filters are different from each other. In order to select a specific wavelength band of light, the angle-adjustable bandpass filter module is rotated, thereby selecting one of the plurality of angle-adjustable bandpass filters.

[0021] The method of providing a variable wavelength light source of the present invention may also include a step of rotating the angle-adjustable bandpass filter, wherein the multiple angle-adjustable bandpass filters are rotated separately to adjust the incident angle of light relative to the corresponding filter, and the wavelength of the light passing through the filter is selected differently according to the incident angle. As the angle-adjustable bandpass filter rotates, the light has a specific incident angle to pass through the angle-adjustable bandpass filter selected from the multiple angle-adjustable bandpass filters, thereby selecting a specific wavelength within the selected wavelength band of the light.

[0022] The method of providing a variable wavelength light source of the present invention may also include a step of rotating another angle-adjustable bandpass filter module, by rotating the another angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the another angle-adjustable bandpass filter module, thereby adjusting the bandwidth of the band with the specific wavelength as the center wavelength within the selected wavelength band.

[0023] An incident angle of light with respect to the angle adjustment bandpass filter may be greater than or equal to 0° and less than or equal to 90°.

[0024] In the step of irradiating the light, the diffuse light source may be a light emitting diode (LED) or a lamp.

[0025] In the step of uniformizing the error caused by the incident angle of the light, the mixing module may be an optical fiber, a liquid crystal light guide, or a rod lens.

[0026] Effects of the Invention

[0027] According to the present invention, diffused light is collimated by a parallel light module including an axicon lens, the wavelength of the collimated light is selected by an angle-adjustable bandpass filter module, and errors in a specific wavelength according to the incident angle of the light passing through the angle-adjustable bandpass filter module are uniformly corrected by a mixing module, thereby obtaining a collimated variable-wavelength light source at low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Part (a) is a diagram showing the propagation of light with linearity. Figure 1 Part (b) is a diagram showing the propagation of diffused light.

[0029] Figure 2 A diagram showing the structure of a confocal microscope including a pinhole.

[0030] Figure 3 FIG. 1 is a diagram showing an embodiment of a light source device according to the present invention.

[0031] Figure 4This is a diagram showing an embodiment of the path of light in the light source device of the present invention.

[0032] Figure 5 This figure shows simulation results when diffused light passes through a collimating light module that does not include an axicon lens.

[0033] Figure 6 Graphs showing simulation results when diffused light passes through a collimating light module including an axicon lens.

[0034] Figure 7 FIG. 1 is a diagram showing an embodiment of an angle-adjustable bandpass filter according to the present invention.

[0035] Figure 8 FIG. 1 is a diagram illustrating an embodiment of an angle-adjustable bandpass filter module according to the present invention.

[0036] Figure 9 Part (a) is a diagram showing an embodiment of the rotational motion of the angle-adjustable bandpass filter module of the present invention, Figure 9 Part (b) is a diagram showing an embodiment of the rotational motion of the angle-adjustable bandpass filter of the present invention.

[0037] Figure 10 FIG2 is a diagram showing an embodiment including another angle-adjustable bandpass filter.

[0038] Figure 11 FIG. 1 is a diagram showing an embodiment of a mixing module according to the present invention. DETAILED DESCRIPTION

[0039] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 The advantages and features of the present invention, as well as methods for achieving them, will become apparent through the detailed description of the embodiments. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in a variety of different forms. These embodiments are provided solely to complete the disclosure of the present invention and to fully inform those skilled in the art of the present invention of the scope of the present invention. The present invention is defined solely by the scope of the claims. Throughout this specification, the same reference numerals represent the same structural elements.

[0040] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification are to be used with the meanings commonly understood by those skilled in the art to which this invention belongs. Furthermore, unless otherwise specifically defined, terms defined in commonly used dictionaries should not be interpreted in an idealized or excessive manner.

[0041] The terms used in this specification are intended to illustrate the embodiments and are not intended to limit the present invention. In this specification, unless otherwise specified, the singular also includes the plural. The terms "comprise" and / or "include" used in this specification do not exclude the presence or addition of one or more other structural elements in addition to the structural elements mentioned.

[0042] Hereinafter, a light source device and method for efficiently adjusting light wavelength using a parallel light module including an axicon lens according to embodiments of the present invention will be described with reference to the accompanying drawings.

[0043] Reference Figure 3 The light source device of the present invention includes a diffuse light source 1, a parallel light module 2 including an axicon lens 21, an angle adjustment bandpass filter module 3 and a mixing module 4.

[0044] More specifically, refer to Figure 4 In the variable wavelength light source device of the present invention, light is emitted from a diffuse light source 1 and diffused. The light passes through a parallel light module 2 including an axicon lens 21, thereby being effectively integrated and collimated. Thereafter, a specific wavelength of light is selected by an angle-adjustable bandpass filter module 3 and passed through a mixing module 4, thereby adjusting the error caused by the incident angle of the light relative to the angle-adjustable bandpass filter module 3.

[0045] The parallel light module 2 of the present invention includes an axicon lens 21. In addition to the axicon lens 21, the parallel light module 2 of the present invention may also include at least one lens 22. For example, light emitted from a multi-focus light source and propagating at multiple focal points can be effectively integrated by the axicon lens 21, and the integrated light passes through the lens 22 and is collimated. The lens 22 also included in the parallel light module 2 of the present invention is not limited as long as it can integrate and / or collimate light, and it can be a convex lens, etc. For example, the parallel light module 2 of the present invention may include an axicon lens 21, two convex lenses that play a collimating role, and a focusing lens composed of convex lenses. Specifically, the axicon lens 21 integrates light with a large divergence angle and diffuses into the air to reduce the divergence angle, the two convex lenses maximize the light and then collimate it, and the focusing lens maximizes the light and then releases it, thereby outputting light with a higher energy density.

[0046] The light source of the present invention refers to a diffuse light source 1. Specifically, the diffuse light source 1 refers to all light sources that emit diffuse light, and the focus of the diffuse light can be one or more. For example, the diffuse light source 1 can be an ordinary lamp or a light emitting diode (LED), and the light emitted from the diffuse light source 1 can be Figure 1 Part (b) of the same form of propagation.

[0047] The diffuse light source 1 has the advantage of low cost, but aberration occurs depending on the angle at which light is diffused at multiple points, making it difficult to collimate the light. Even if the diffuse light source is collimated, there is a disadvantage of large energy loss.

[0048] In response to this, the inventors of the present invention have disclosed a structure that uses a diffuse light source to reduce costs while allowing light emitted from the diffuse light source to pass through a parallel light module including an axicon lens in order to obtain collimated light with less energy loss.

[0049] Typically, in the technical field to which the present invention pertains, axicon lenses are often used with linear laser beams. Specifically, axicon lenses are typically used to form circular light together with laser beams. Therefore, using an axicon lens with a diffuse light source is uncommon in the technical field to which the present invention pertains. However, the inventors of the present invention employed a structure combining a diffuse light source and an axicon lens, which is uncommon in the technical field to which the present invention pertains, and discovered that light emitted from the diffuse light source can be effectively integrated when passing through the axicon lens.

[0050] Specifically, Figure 5 and Figure 6 2 shows the results of simulation calculations of the light quantity when light emitted from a diffuse light source passes through a parallel light module without an axicon lens and a parallel light module with an axicon lens. For reference, the present inventors conducted simulations using Ray Optics Simulation.

[0051] Reference Figure 5 , Figure 5 The collimator module does not include an axicon lens. In this case, a significant portion of the light emitted from the diffuse light source cannot pass through the collimator module. Only a portion of the light emitted from the diffuse light source passes through the collimator module and is integrated and collimated. This confirms that the output light energy flux is 148 cd (candela).

[0052] On the contrary, refer to Figure 6 , it can be seen that Figure 6 The collimating light module includes an axicon lens. In this case, only a portion of the light emitted from the diffuse light source is unable to pass through the axicon lens. The majority of the light emitted from the diffuse light source passes through the axicon lens and is effectively integrated. It is then integrated and collimated by the multiple lenses included in the collimating light module, confirming that the output light has an energy flux of 197 cd.

[0053] That is, it can be seen from the simulation results that Figure 5 As shown, compared with the case of using a parallel light module without an axicon lens, Figure 6As shown in FIG. 1 , it was confirmed that the amount of output light increased by approximately 1.33 times when the parallel light module including the axicon lens was used.

[0054] That is, the inventors of the present invention include an axicon lens, which is usually not used for diffuse light sources, in the parallel light module to effectively integrate and collimate the light emitted from the diffuse light source, thereby reducing costs and overcoming the energy limitation of the diffuse light source.

[0055] The angle-adjustable bandpass filter module of the present invention is used to select the wavelength band of light passing through the angle-adjustable bandpass filter module. For example, light passes through the angle-adjustable bandpass filter module so that the wavelength of the light can be selected as a wavelength within the visible light region of 400nm to 700nm. In one embodiment, the wavelength of light passing through the angle-adjustable bandpass filter module can be selected as a wavelength band centered at 561nm and having a narrowband of approximately 2nm. In another embodiment, the wavelength of light passing through the angle-adjustable bandpass filter module can also be selected as a wavelength band centered at 561nm and having a band of approximately 10nm to 15nm. In yet another embodiment, the wavelength of light passing through the angle-adjustable bandpass filter module can also be selected as a wavelength band centered at 512nm and having a band of approximately 2nm or a band of approximately 10nm to 15nm.

[0056] In the present invention, light passing through the parallel light module including the axicon lens can pass through the angle-adjustable bandpass filter module, and light having a specific wavelength selected by the angle-adjustable bandpass filter module can be incident on the hybrid module.

[0057] Furthermore, the angle-adjustable bandpass filter module 3 of the present invention may include an angle-adjustable bandpass filter 30 as a bandpass filter. The angle-adjustable bandpass filter 30 of the present invention may be rotatable. For example, the angle-adjustable bandpass filter 30 of the present invention may be rotated by a motor, but the present invention is not limited thereto. As long as the angle-adjustable bandpass filter 30 can be rotated, a structure other than a motor may also be used.

[0058] Furthermore, the angle-adjustable bandpass filter 30 of the present invention can be rotated, thereby setting the angle of light incident on the angle-adjustable bandpass filter 30 in a variety of ways, that is, the angle of incidence (AOI) of the light relative to the filter. The angle of incidence (AOI) is greater than or equal to 0° and less than 90°. Preferably, the angle of incidence (AOI) can be 0° (normal incidence), 30°, 45°, or 60°.

[0059] Moreover, in the present invention, the wavelength of the light passing through the angle-adjustable bandpass filter 30 can be selected according to the angle of incidence (AOI). Specifically, when the angle of incidence (AOI) gradually increases from 0°, the wavelength of the light output by the angle-adjustable bandpass filter 30 tends to gradually decrease. From a mathematical point of view, when the angle of incidence (AOI) is θ, n eff When the effective refractive index is a value specified by the filter structure and two orthogonal states of polarization, the output wavelength λ(θ) is as follows.

[0060]

[0061] More specifically, refer to Figure 7 When light that has passed through the parallel optical module of the present invention and is collimated passes through the angle-adjustable bandpass filter 30 at an angle of incidence (AOI) of 0°, the wavelength of the light can be set to have an A wavelength band. Furthermore, when light that has passed through the parallel optical module of the present invention and is collimated passes through the angle-adjustable bandpass filter 30 at an angle of incidence (AOI) of 60°, the wavelength of the light can be set to have a B wavelength band. For example, when the angle of incidence (AOI) is 0°, the center of the wavelength band of the selected light is approximately 561 nm, that is, the center of the A wavelength band can be approximately 561 nm. Furthermore, when the angle of incidence (AOI) is 60°, the center of the wavelength band of the selected light is approximately 512 nm, that is, the center of the B wavelength band can be approximately 512 nm.

[0062] The angle adjustment bandpass filter module 3 of the present invention can be a circular plate. Specifically, the angle adjustment bandpass filter module 3 can be a circular plate with a specified thickness, the center of which can be connected to the motor. In addition, the angle adjustment bandpass filter module 3 of the present invention can include multiple angle adjustment bandpass filters 30. The multiple angle adjustment bandpass filters 30 can be arranged in a circular shape at the edge of the angle adjustment bandpass filter module 3. For example, the angle adjustment bandpass filter module 3 of the present invention can be as follows Figure 8 Furthermore, in the present invention, as the angle-adjustable band-pass filter module 3 is automatically or manually rotated by a motor, one of the plurality of angle-adjustable band-pass filters 30 can be selected.

[0063] The device including the light source device of the present invention includes a diffuse light source, a parallel light module including an axicon lens, an angle adjustment bandpass filter module and a mixing module. Therefore, as long as the light emitted by the diffuse light source can be effectively integrated and collimated, it can be in any form.

[0064] There are two types of rotational movements in the angle-adjustable bandpass filter module 3 according to the present invention.

[0065] First, refer to Figure 9 In part (a), in the present invention, as the angle-adjustable band-pass filter module 3 rotates, one of the multiple angle-adjustable band-pass filters 30 formed at the edge of the angle-adjustable band-pass filter module 3 can be selected. In this case, one of the multiple angle-adjustable band-pass filters 30 can be selected by a motor and / or a control device connected to the angle-adjustable band-pass filter module 3. Thus, in the present invention, a specific wavelength region of light passing through the angle-adjustable band-pass filter module can be selected. For example, a wavelength region to which a wavelength of 532 nm belongs can be selected.

[0066] The present invention has the following effect: by having a structure including a plurality of angle-adjustable bandpass filters 30 and being able to select one of them, the wavelength band of light can be selected in various ways according to the detection target with a simple structure.

[0067] Next, as described above, the angle-adjustable bandpass filter 30 included in the angle-adjustable bandpass filter module 3 can also be rotated. As the angle-adjustable bandpass filter 30 rotates, the angle of incidence (AOI) of light with respect to the filter 30 changes, thereby enabling the wavelength of light passing through the filter 30 to be selected as a desired wavelength. For example, a wavelength band centered at 532 nm within the selected wavelength region including 532 nm can be selected.

[0068] That is, the angle-adjustable bandpass filter module 3 of the present invention exhibits two types of rotational motion. In the present invention, by adjusting these two types of rotational motion, a specific wavelength within a desired wavelength range can be arbitrarily selected within a relatively wide wavelength range. In other words, the present invention expands the range of selectable wavelengths by utilizing the angle-adjustable bandpass filter module and a structure that enables it to rotate in two types of rotational motion. Consequently, it is possible to output a collimated light source having any wavelength using only a diffuse light source having a relatively wide wavelength range, without requiring multiple light sources having a single wavelength (e.g., lasers).

[0069] Furthermore, the variable wavelength light source device of the present invention may further include another angle-adjustable bandpass filter module. For example, the variable wavelength light source device of the present invention may include two angle-adjustable bandpass filter modules. In this case, by rotating one angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the one angle-adjustable bandpass filter module, a specific wavelength within a specific wavelength region can be selected as described above. In this case, by rotating another angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the other angle-adjustable bandpass filter module, the bandwidth of the wavelength band having the specific wavelength within the selected specific wavelength region as the center wavelength can be adjusted. For example, the bandwidth of the selected wavelength band having 532 nm as the center wavelength can be adjusted.

[0070] Therefore, the present invention has the following effect: by using one or more angle-adjustable bandpass filter modules and one or more angle-adjustable bandpass filters included in the angle-adjustable bandpass filter module, the required specific wavelength region, the wavelength band within the specific wavelength region, and its bandwidth can be freely adjusted.

[0071] On the other hand, even if the light emitted from the diffuse light source of the present invention passes through the parallel light module, there is a possibility that the light cannot be completely collimated. Figure 11 , after the light emitted from the diffuse light source passes through the parallel light module, the light rays may not be incident in parallel on the angle-adjustable bandpass filter 30. In this case, since the angles of incidence (AOI) of the light rays relative to the angle-adjustable bandpass filter 30 vary spatially, the wavelengths selected for the light rays passing through the angle-adjustable bandpass filter 30 are also different.

[0072] To address this issue, the present invention may include a hybrid module. When light that has not been collimated by the collimating light module passes through the angle-adjustable bandpass filter 30 and a wavelength different from the desired wavelength is selected, the hybrid module of the present invention can spatially correct the wavelength that has been selected.

[0073] Specifically, refer to Figure 11The wavelengths of light passing through the angle-adjustable bandpass filter 30 can be selected as wavelength A, wavelength B, and wavelength C, respectively. In this case, for example, the hybrid module of the present invention can correct wavelengths A, B, and C. More specifically, for example, when the light passing through the parallel light module is collimated and incident on the angle-adjustable bandpass filter 30 at the same angle of incidence (AOI), it can be assumed that light having wavelength B is output from the angle-adjustable bandpass filter 30. Furthermore, if the light passing through the parallel light module does not enter the angle-adjustable bandpass filter 30 at the same angle of incidence (AOI), but passes through the angle-adjustable bandpass filter 30 at different angles of incidence (AOI), for example, light having wavelengths A, B, and C can be output from the angle-adjustable bandpass filter 30. In this case, the hybrid module 4 of the present invention can correct the light output from the angle-adjustable bandpass filter 30 having wavelengths A, B, and C so that it has wavelength B. That is, the hybrid module 4 of the present invention can output light of the same wavelength regardless of where the light passes through the hybrid module 4.

[0074] The hybrid module of the present invention may be an optical fiber, a liquid crystal light guide, or a rod lens, but is not limited thereto and may be applied to a variety of products.

[0075] Next, the method for providing a variable wavelength light source of the present invention will be described. The method for providing a light source of the present invention relates to a method for providing a variable wavelength light source using the light source device of the present invention.

[0076] Specifically, the present invention provides a method for providing a variable wavelength light source, including the following steps: irradiating diffuse light using a diffuse light source; collimating the light emitted from the diffuse light source using a collimating light module, the collimating light module including an axicon lens; allowing the light passing through the collimating light module to pass through an angle-adjustable bandpass filter module to select a specific wavelength of light; and correcting errors in the specific wavelength using a mixing module based on the incident angle of the light passing through the angle-adjustable bandpass filter module. In this case, in the step of collimating the light emitted from the diffuse light source, the collimating light module includes an axicon lens.

[0077] The step of selecting a specific wavelength of light in the present invention may further include the step of rotating an angle-adjustable bandpass filter module. In the step of rotating the angle-adjustable bandpass filter module in the present invention, the angle-adjustable bandpass filter module is in the form of a circular plate and includes a plurality of angle-adjustable bandpass filters, the plurality of angle-adjustable bandpass filters being arranged in a circular pattern at an edge of the angle-adjustable bandpass filter module. For each of the plurality of angle-adjustable bandpass filters, the selected wavelength band of light passing through the corresponding filter is different from one another. Furthermore, by rotating the angle-adjustable bandpass filter module to select the specific wavelength band of light, one of the plurality of angle-adjustable bandpass filters can be selected.

[0078] The step of selecting a specific wavelength of light of the present invention may further include rotating an angle-adjustable bandpass filter. In the step of selecting a specific wavelength of light of the present invention, the plurality of angle-adjustable bandpass filters rotate to adjust the incident angle of light relative to the corresponding filter, and the wavelength of light passing through the filter is selected differently according to the incident angle. As the angle-adjustable bandpass filters rotate, light having a specific incident angle passes through an angle-adjustable bandpass filter selected from the plurality of angle-adjustable bandpass filters, thereby selecting a specific wavelength within the selected wavelength band of light.

[0079] In the method of providing a variable wavelength light source of the present invention, a step of rotating another angle-adjustable bandpass filter module may also be included. In this case, by rotating the another angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the another angle-adjustable bandpass filter module, the bandwidth of the band with the specific wavelength as the center wavelength within the selected wavelength band can be adjusted.

[0080] In the method for providing a variable wavelength light source of the present invention, the diffuse light source may be a light emitting diode (LED) or a lamp, and the mixing module may be an optical fiber, a liquid crystal light guide, or a rod lens.

[0081] While the embodiments of the present invention have been described above with reference to the accompanying drawings, it should be understood that a person skilled in the art may implement the present invention in other specific forms without changing the technical concept or essential features of the present invention. Therefore, the embodiments described above are illustrative in all respects and are not restrictive.

[0082] Description of Reference Signs

[0083] 1: Diffused light source

[0084] 2: Parallel optical module

[0085] 3: Angle adjustment bandpass filter module

[0086] 4: Hybrid module

[0087] 21: Axicon lens

[0088] 22: Lens

[0089] 30: Angle-adjustable bandpass filter

Claims

1. A variable wavelength light source device, characterized in that: include: A diffuse light source, used for irradiating diffuse light; a parallel light module, for collimating the light emitted from the diffuse light source, the parallel light module comprising an axicon lens; an angle-adjustable bandpass filter module to pass light passing through the parallel light module to select a specific wavelength of the light; as well as The hybrid module corrects a spatial error of a specific wavelength according to an incident angle of light passing through the angle-adjustable bandpass filter module.

2. The variable wavelength light source device according to claim 1, wherein: The angle-adjustable band-pass filter module is a circular plate and includes a plurality of angle-adjustable band-pass filters. The plurality of angle-adjustable band-pass filters are arranged in a circular shape at an edge portion of the angle-adjustable band-pass filter module, and the selected wavelength bands of light passing through the corresponding filters are different from each other according to each of the plurality of angle-adjustable band-pass filters. The angle-adjustable band-pass filter module is rotated to select a specific wavelength band of light, thereby selecting one of the plurality of angle-adjustable band-pass filters.

3. The variable wavelength light source device according to claim 2, wherein: The plurality of angle-adjustable bandpass filters are rotated respectively to adjust the incident angle of light relative to the corresponding filter, and the wavelength of light passing through the filter is selected differently according to the incident angle. As the angle adjustment band pass filter rotates, light having a specific incident angle passes through an angle adjustment band pass filter selected from the plurality of angle adjustment band pass filters, thereby selecting a specific wavelength within a selected wavelength band of light.

4. The variable wavelength light source device according to claim 3, wherein: The variable wavelength light source device further includes another angle-adjustable bandpass filter module, The bandwidth of a band centered around the specific wavelength within the selected wavelength band is adjusted by rotating the other angle-adjustable band-pass filter module and the angle-adjustable band-pass filter of the other angle-adjustable band-pass filter module.

5. The variable wavelength light source device according to claim 3, wherein: The incident angle of light with respect to the angle adjustment bandpass filter is greater than or equal to 0° and less than 90°.

6. The variable wavelength light source device according to claim 1, wherein: The diffuse light source is a light emitting diode or a lamp.

7. The variable wavelength light source device according to claim 1, wherein: The hybrid module is an optical fiber, a liquid crystal light guide device or a rod lens.

8. A method for providing a variable wavelength light source, characterized in that: The steps include: Irradiate diffuse light by diffusing the light source; collimating the light emitted from the diffuse light source by a parallel light module, wherein the parallel light module includes an axicon lens; adjusting the angle of the bandpass filter module to pass light passing through the parallel light module to select a specific wavelength of light; as well as By the hybrid module, a spatial error of a specific wavelength is corrected according to the incident angle of light passing through the angle adjustment band pass filter module.

9. The method for providing a variable wavelength light source according to claim 8, wherein: Also included is the step of rotating the angle-adjustable bandpass filter module, The angle-adjustable band-pass filter module is a circular plate and includes a plurality of angle-adjustable band-pass filters. The plurality of angle-adjustable band-pass filters are arranged in a circular shape at an edge portion of the angle-adjustable band-pass filter module, and the selected wavelength bands of light passing through the corresponding filters are different from each other according to each of the plurality of angle-adjustable band-pass filters. The angle-adjustable band-pass filter module is rotated to select a specific wavelength band of light, thereby selecting one of the plurality of angle-adjustable band-pass filters.

10. The method for providing a variable wavelength light source according to claim 9, wherein: Also included is the step of rotating the angle-adjustable bandpass filter, The plurality of angle-adjustable bandpass filters are rotated respectively to adjust the incident angle of light relative to the corresponding filter, and the wavelength of light passing through the filter is selected differently according to the incident angle. As the angle adjustment band pass filter rotates, light having a specific incident angle passes through an angle adjustment band pass filter selected from the plurality of angle adjustment band pass filters, thereby selecting a specific wavelength within a selected wavelength band of light.

11. The method for providing a variable wavelength light source according to claim 10, wherein: It also includes the step of rotating another angle-adjustable bandpass filter module, by rotating the another angle-adjustable bandpass filter module and the angle-adjustable bandpass filter of the another angle-adjustable bandpass filter module, thereby adjusting the bandwidth of the band with the specific wavelength as the center wavelength within the selected wavelength band.

12. The method for providing a variable wavelength light source according to claim 8, wherein: An incident angle of light with respect to the angle adjustment bandpass filter is greater than or equal to 0° and less than 90°.

13. The method for providing a variable wavelength light source according to claim 8, wherein: The diffuse light source is a light emitting diode or a lamp.

14. The method for providing a variable wavelength light source according to claim 8, wherein: The hybrid module is an optical fiber, a liquid crystal light guide device or a rod lens.

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