TW202215026A - Multi-channel array type optical sensing device and manufacturing method thereof - Google Patents

Abstract

Disclosed are a multi-channel array type optical sensing device and its manufacturing method, and the device includes an encapsulating housing and at least one electrical contact on a side of the encapsulating housing. The encapsulating housing includes a printed circuit board, a light receiving unit, and a filter array for receiving an external incident light and converting the external incident light into a multi-channel optical signal with a non-continuous wavelength. The light receiving unit is electrically connected to the printed circuit board for receiving the multi-channel optical signal. The printed circuit board is provided for transmitting the multi-channel optical signal to the outside through the at least one electrical contact. With a simple design, the multi-channel array type optical sensing device becomes an optical component with the features of low cost and easily extended application and suitable for the spectral analysis of various testing objects.

Description

Multi-channel array optical sensing device and manufacturing method thereof

The invention discloses an optical sensor, in particular to a multi-channel array optical sensor device with low cost and easy extension and a manufacturing method thereof.

Since each element has its own unique spectrum, the method of identifying substances and determining their chemical composition based on the spectrum is called spectroscopic analysis. In recent years, due to the vigorous development of various fields such as electronics, biochemistry, medicine, and optoelectronics, the demand for using spectrometers to analyze various photophysical and photochemical phenomena of materials has increased rapidly. The main function of a spectrometer is a scientific instrument that decomposes light with complex components into spectral lines, which can measure the light reflected from the surface of the object, the penetrating light that penetrates the object, and the absorbed light of the object. Although the traditional spectrometer can achieve the function of optical analysis, it is mainly composed of elements such as crystals or diffraction gratings, so it is expensive and bulky, making it difficult to be practical. In order to reduce the cost of optical analysis, miniature spectrometers have been developed on the market, which utilize the micro-electromechanical (MEMS) process of semiconductors to achieve the goal of miniaturizing optical structures. Although its size and cost are greatly reduced, there are still cost barriers to market entry to be applied to general home testing. Whether it is a traditional spectrometer or a semiconductor micro-electromechanical (MEMS) spectrometer, all of them are continuous full-spectrum (UV-VIS) specifications, so the manufacturing cost is relatively expensive, and it is not easy to cut into home life applications. The market has also developed a non-continuous sensor by directly fabricating photodiode arrays on silicon wafers and matching filter arrays. Although the production cost can be reduced in mass production, only silicon wafers are produced The cost is quite high, and its manufacturing cost is not significantly reduced until a certain volume is reached. Therefore, how to meet the needs of improving optical sensitivity, reducing the number of optical components used, and reducing development and production costs in order to expand to general home inspection is an important issue that needs to be solved urgently in the field of optical inspection at present.

In view of this, the present invention provides a multi-channel array optical sensing device and a manufacturing method thereof to overcome the conventional problems and meet the aforementioned requirements, so as to achieve the purpose and efficacy of low-cost and easy extended application of optical detection. To achieve the above object, the present invention provides the following technical solutions: A multi-channel array optical sensing device, comprising: an encapsulation casing, and at least one electrical contact is arranged on one side of the encapsulation casing; a filter array is arranged in the encapsulation casing, the filter The array is used to receive an external incident light and convert it into a multi-channel optical signal with discontinuous wavelengths; a light receiving unit is encapsulated inside the encapsulation shell and arranged below the filter array, for receiving the multi-channel optical signal; and a printed circuit board covering the inside of the package shell and electrically coupled between the light receiving unit and the at least one electrical contact for the The multi-channel optical signal is transmitted externally through the at least one electrical contact. In the above-mentioned multi-channel array optical sensing device, the filter array is a matrix glass filter unit, and a plurality of filters of different wavelengths are arranged on it. In the above-mentioned multi-channel array optical sensing device, the filter array is composed of a plurality of filters with different wavelengths. In the above multi-channel array optical sensing device, the light receiving unit is a photodiode array. The above-mentioned multi-channel array optical sensing device further includes a reflective light-shielding layer disposed between the filter array and the light receiving unit to limit the stray light distribution of the multi-channel optical signal. The above-mentioned multi-channel array optical sensing device further includes a transparent protective layer disposed above the filter array. Another embodiment of the present invention is to provide a method for manufacturing a multi-channel array optical sensing device, the method comprising: providing an encapsulation casing, and arranging at least one electrical contact on one side of the encapsulating casing ; A filter array is arranged in the package casing, the filter array is used to receive an external incident light and convert it into a multi-channel optical signal with discontinuous wavelengths; A light is arranged under the filter array a receiving unit for receiving the multi-channel optical signal; and a printed circuit board electrically coupled between the light-receiving unit and the at least one electrical contact for transmitting the multi-channel optical signal through the at least one electrical connection Sex contacts for external transmission. In the above-mentioned manufacturing method of a multi-channel array optical sensing device, the filter array is a matrix glass filter unit, and a plurality of filters of different wavelengths are arranged thereon. In the above-mentioned manufacturing method of a multi-channel array optical sensing device, the filter array is composed of a plurality of filters with different wavelengths. In the above-mentioned manufacturing method of the multi-channel array optical sensing device, the light receiving unit is a photodiode array. The manufacturing method of the above-mentioned multi-channel array optical sensing device further includes the step of providing a reflective light-shielding layer disposed between the filter array and the light-receiving unit, so as to limit the interference of the multi-channel optical signal. Astigmatism distribution. The above-mentioned manufacturing method of the multi-channel array optical sensing device further includes the step of providing a transparent protective layer disposed above the filter array.

The directional or similar terms used throughout this disclosure, such as "front", "back", "left", "right", "top (top)", "bottom (bottom)", "inside", "outside" , "side surface", etc., mainly refer to the directions of the attached drawings, each directionality or its similar terms are only used to assist the description and understanding of the various embodiments of the present invention, and are not intended to limit the present invention. 1 is a side cross-sectional view of a first embodiment of the multi-channel array optical sensing device of the present invention. As shown in FIG. 1 : the multi-channel array optical sensing device 10 of the present invention includes a package casing 11 , and the At least one electrical contact (soldering point) 15 is disposed on one side (side or bottom) of the package casing 11 for combining with an external electronic device (not shown). As the name implies, the encapsulation case 11 is, for example, a hard case or other closed structure with a protective function, etc., which can protect the electronic components inside it from being contaminated with dust or dirt. The electronic components inside are damaged by direct impact. The package casing 11 mainly includes a printed circuit board 14 , a light receiving unit 13 and a filter array 12 . The filter array 12 is a matrix glass filter unit for receiving external incident light. FIG. 2 is a top view of an embodiment of the filter array of the present invention. As shown in FIG. 2 , the filter array 12 is provided with a plurality of filters 121˜12n of different wavelengths. The purpose of configuring the filters 121 to 12n is to allow light with a specific wavelength to pass through and block other light that does not belong to a specific wavelength. Therefore, when the external incident light hits the filters 121-12n, only the light of a specific wavelength can pass through the filters 121-12n, which is regarded as being converted into multi-channel optical signals with discontinuous wavelengths. According to the required wavelength, a plurality of filter structures with different wavelengths can be designed, which can produce the spectral effect of multiple wavelengths. The separated light is the discontinuous spectrum, which is used to realize the discontinuous spectrum. analyze. The light receiving unit 13 is a photodiode array and is electrically connected to the printed circuit board 14. In different embodiments, the light receiving unit 13 can also be fixed on the printed circuit board 14, and receives multi-channel optical signals with discontinuous wavelengths. The multi-channel optical signal is transmitted from the light receiving unit 13 to the printed circuit board 14 , and the printed circuit board 14 transmits the multi-channel optical signal through at least one electrical contact 15 to the outside. Figure 3 is a spectrum diagram of blood absorption, as shown in Figure 3: For the absorption spectrum of human blood, in addition to an obvious absorption peak around 415 nm, human blood is between 500-600 nm, especially 541 nm. /577 nm, an absorption feature similar to an M-shaped pattern will appear. With this feature, the user can irradiate the aqueous solution to be detected through a light beam, and use the multi-channel array optical sensing device 10 of the present invention to receive the penetration to be detected. The light of the aqueous solution is separated and the light is separated to identify the signal of whether there is blood in the aqueous solution to be detected. If there is an absorption feature similar to an M-shaped pattern in the spectrum, it means there is blood, and vice versa. The detection method can be adjusted for the target biometrics to be detected. For example, if our goal is to detect blood, we can design filters of different wavelengths between 500-600nm to split light into 25 wavelengths, and use the signals of these wavelengths to analyze whether there are blood components in it through an algorithm. . If the goal is to detect proteins, the selected interval will not be 500-600nm, but can be changed to 250-350nm, because the spectral features of proteins are mainly around 280nm. The multi-channel array optical sensing device 10 of the present invention further includes a reflective light shielding layer 16 disposed between the filter array 12 and the light receiving unit 13, and the reflective light shielding layer 16 is used to limit the multi-channel optical signals The stray light distribution can avoid affecting the test results due to the transmission of stray light. FIG. 4 is a side cross-sectional view of a second embodiment of the multi-channel array optical sensing device of the present invention. As shown in FIG. 4 : the multi-channel array optical sensing device 20 of the present invention includes a package housing 21 , and At least one electrical contact (soldering point) 25 is disposed on one side (side or bottom) of the package casing 21 to be combined with an external electronic device (not shown). The package casing 21 mainly includes a printed circuit board 24 , a light receiving unit 23 , a filter array 22 and a transparent protective layer 27 . Compared with the first embodiment, the second embodiment adds the transparent protective layer 27 but lacks a reflective light shielding layer 26 . The transparent protective layer 27 is disposed above a filter array 22 and is aligned with the top surface of the package casing 21 . In this way, external incident light will pass through the transparent protective layer 27 and then be received by the filter array 22 . and the filter array 22 does not directly contact with the outside, which can increase its service life. FIG. 5 is a side cross-sectional view of a third embodiment of the multi-channel array optical sensing device of the present invention. As shown in FIG. 5 : the filter array 22 of the third embodiment of the present invention can be composed of a plurality of independent filters with different wavelengths. It is composed of light sheets 221~22n. Compared with the filter array 12 (matrix glass filter unit) of the above-mentioned first embodiment, it is more flexible in use. Also because the filter array 22 can be composed of a plurality of independent filters 221-22n with different wavelengths, the reflective light-shielding layer 26 must be covered around the filters 221-22n to limit the multi-channel optical signal. The stray light distribution can avoid affecting the test results due to the transmission of stray light. FIG. 6 is a side cross-sectional view of a fourth embodiment of the multi-channel array optical sensing device of the present invention, as shown in FIG. 6 : the difference from the previous embodiment is that the transparent protection of the present invention in this embodiment is The layer 27 and the filter array 22 are superimposed as a whole, and can be bonded by, for example, a transparent adhesive, so as to avoid the phenomenon of refraction of light therebetween. The optical filter array formed by the filters of different wavelengths is used for light splitting, and biological detection is carried out in a discontinuous light splitting manner, so that the manufacturing cost of the multi-channel array optical sensing device of the present invention is greatly reduced, and can be used for the detection. The optical characteristics of the object determine the wavelength configuration of the filters on the filter array. In addition, the stacking structure of the optical elements of the multi-channel array optical sensing device of the present invention is not complicated, realizing the miniaturization of the optical structure, reducing the assembly process, Consumables and difficulty, at the same time, it is very easy to extend to various spectral analysis (such as fruit sweetness, pesticide detection of vegetables, sample analysis of biomedicine, and application development of optoelectronic technology, etc.) Lack of familiar skills. The above description is only an embodiment of the present invention, but is not intended to limit the scope of the patent. Therefore, any simple modifications and equivalent structural changes made by using the contents of the description and drawings of the present invention are included in the patent scope of the present invention.

10: Multi-channel array optical sensing device 11: Encapsulation shell 12: Filter array 121~12n: filter 13: Light receiving unit 14: Printed Circuit Board 15: Electrical contacts 16: Reflective shading layer 20: Multi-channel array optical sensing device 21: Encapsulation shell 22: Filter array 23: Light receiving unit 24: Printed Circuit Board 25: Electrical contacts 26: Reflective shading layer 27: Transparent protective layer

1 is a side cross-sectional view of a first embodiment of a multi-channel array optical sensing device of the present invention; 2 is a top view of an embodiment of the filter array of the present invention; Figure 3 is a spectrogram of blood absorption; 4 is a side cross-sectional view of a second embodiment of the multi-channel array optical sensing device of the present invention; 5 is a side cross-sectional view of a third embodiment of the multi-channel array optical sensing device of the present invention; and 6 is a side cross-sectional view of a fourth embodiment of the multi-channel array optical sensing device of the present invention.

10: Multi-channel array optical sensing device

11: Encapsulation shell

12: Filter array

13: Light receiving unit

14: Printed Circuit Board

15: Electrical contacts

16: Reflective shading layer

Claims (12)

A multi-channel array optical sensing device, comprising: an encapsulation casing, and at least one electrical contact is disposed on one side of the encapsulation casing; an optical filter array disposed in the package casing, the optical filter array is used for receiving an external incident light and converting it into a multi-channel optical signal with discontinuous wavelengths; a light-receiving unit, covering the inside of the encapsulation shell and disposed under the filter array, for receiving the multi-channel optical signal; and A printed circuit board is encapsulated inside the package shell and electrically coupled between the light receiving unit and the at least one electrical contact for transmitting the multi-channel optical signal through the at least one electrical contact contacts for external transmission. The multi-channel array optical sensing device of claim 1, wherein the filter array is a matrix glass filter unit on which a plurality of filters of different wavelengths are arranged. The multi-channel array optical sensing device of claim 1, wherein the filter array is composed of a plurality of filters with different wavelengths. The multi-channel array optical sensing device of claim 1, wherein the light receiving unit is an optical diode array. The multi-channel array optical sensing device of claim 1, further comprising a reflective light shielding layer disposed between the filter array and the light receiving unit to limit the stray light distribution of the multi-channel optical signal. The multi-channel array optical sensing device of claim 1 further comprises a transparent protective layer disposed above the filter array. A method for manufacturing a multi-channel array optical sensing device, the method comprising: providing an encapsulation shell, and disposing at least one electrical contact on one side of the encapsulation shell; A filter array is arranged in the package casing, and the filter array is used to receive an external incident light and convert it into a multi-channel optical signal with discontinuous wavelengths; A light-receiving unit is arranged under the filter array for receiving the multi-channel optical signal; and A printed circuit board is electrically coupled between the light receiving unit and the at least one electrical contact for external transmission of the multi-channel optical signal through the at least one electrical contact. The method for manufacturing a multi-channel array optical sensing device according to claim 7, wherein the filter array is a matrix glass filter unit on which a plurality of filters of different wavelengths are arranged. The method for manufacturing a multi-channel array optical sensing device according to claim 7, wherein the filter array is composed of a plurality of filters with different wavelengths. The method for manufacturing a multi-channel array optical sensing device according to claim 7, wherein the light receiving unit is a photodiode array. The method for manufacturing a multi-channel array optical sensing device according to claim 7, further comprising the step of providing a reflective light-shielding layer disposed between the filter array and the light-receiving unit to limit the multi-channel optical signal Stray light distribution. The manufacturing method of the multi-channel array optical sensing device according to claim 7, further comprising the step of providing a transparent protective layer disposed above the filter array.

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