CN220932984U

CN220932984U - Multi-channel dry biochemical analyzer

Info

Publication number: CN220932984U
Application number: CN202322506493.3U
Authority: CN
Inventors: 邓克刚; 冯春; 温晓斌; 齐杰飞; 牛勇涛
Original assignee: Shenzhen Dexia Diagnostic Technology Co ltd
Current assignee: Shenzhen Dexia Diagnostic Technology Co ltd
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-05-10
Anticipated expiration: 2033-09-14

Abstract

The utility model discloses a multichannel dry biochemical analyzer, which comprises a shell, at least two photoelectric detection modules and at least two shading pieces, wherein the front side of the shell is provided with at least two card inserting holes; the at least two photoelectric detection modules are arranged in the shell at intervals along the horizontal direction and correspond to the at least two card inserting holes one by one, and each photoelectric detection module is opposite to a corresponding card inserting hole so as to enable a detection card to be inserted into the photoelectric detection module from the card inserting hole; at least two shading pieces are arranged in the shell and correspond to at least two photoelectric detection modules one by one, and each shading piece is covered on each photoelectric detection module. According to the multi-channel dry biochemical analyzer provided by the embodiment of the utility model, a plurality of detection cards can be inserted at one time for detection, and the requirement of mass detection can be met. In addition, the accuracy and reliability of the detection result are higher.

Description

Multi-channel dry biochemical analyzer

Technical Field

The utility model relates to the technical field of biochemical analysis and detection, in particular to a multichannel dry biochemical analyzer.

Background

A dry biochemical Analyzer (DRY CHEMISTRY Analyzer) is a medical device for analyzing chemical components in biological fluids. Unlike conventional wet chemical analysis methods, dry biochemical analyzers use dry chemical reaction plates or reagent cards for analysis without the need for large amounts of liquid reagents. These instruments are commonly used in clinical laboratories, medical institutions, and hospitals to rapidly and accurately determine various biochemical parameters in a patient's blood, urine, or other biological fluids, such as blood glucose, cholesterol, urea nitrogen, liver function indicators, and the like.

The dry biochemical analyzer in the related art comprises a shell and a detection module, wherein an open detection port is formed in the shell, the detection module is arranged in the detection port, and the structure is easily affected by ambient light, so that the detection result is inaccurate. In addition, the current biochemical analyzer can only detect one detection card at a time, and detection efficiency is low, and the scene of a large number of detection demands is difficult to satisfy.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the utility model aims to provide a multichannel dry biochemical analyzer.

To achieve the above object, a multi-channel dry biochemical analyzer according to an embodiment of the present utility model includes:

The front side of the shell is provided with at least two card inserting holes;

The photoelectric detection modules are arranged in the shell at intervals along the horizontal direction and correspond to the card inserting holes one by one, and each photoelectric detection module is opposite to a corresponding card inserting hole so as to enable a detection card to be inserted into the photoelectric detection module from the card inserting hole;

The at least two shading pieces are arranged in the shell and correspond to the at least two photoelectric detection modules one by one, and each shading piece is covered on the photoelectric detection module.

According to the multi-channel dry biochemical analyzer provided by the embodiment of the utility model, the multi-channel dry biochemical analyzer is provided with at least two photoelectric detection modules, so that a plurality of detection cards can be inserted at one time for detection, and the requirement of mass detection can be met. In addition, set up the card hole on the shell, photoelectric detection module establishes inside the shell and the card hole is relative to set up the shade in photoelectric detection module's top, so, can form closed detection environment, and shade photoelectric detection module with the shade in the shell is inside, and then can furthest reduce the influence of outside ambient light, improved testing result's accuracy and reliability.

In addition, the multi-channel dry biochemical analyzer according to the above embodiment of the present utility model may further have the following additional technical features:

According to one embodiment of the present utility model, the photodetection module includes:

The clamping seat is provided with a clamping groove, the clamping groove is suitable for the insertion of the detection card, a plurality of detection holes are formed in the bottom of the clamping groove, and the detection holes are arranged at intervals along the length direction of the clamping groove; the shading piece covers the clamping seat;

the heating film is arranged on the clamping seat and used for heating the clamping seat;

The photoelectric assembly is arranged at the bottom of the card seat, is positioned below the detection holes and is used for transmitting excitation light to the detection holes and receiving light rays transmitted by the detection card and converting the light rays into photoelectric signals.

According to one embodiment of the utility model, the outer periphery of the clamping seat is coated with a heat insulation material for preventing the temperature of the clamping seat from being transmitted to the outside.

According to one embodiment of the utility model, a heat insulation plate is arranged between the top surface of the clamping seat and the shading piece.

According to an embodiment of the present utility model, the light shielding member includes:

A horizontal plate, wherein a boss protruding upwards is formed in the middle of the horizontal plate, and a cavity is formed in the boss;

The first side plate is formed by downwards bending one side edge in the width direction of the horizontal plate, and the first side plate is positioned outside the heat insulation material;

the second side plate is formed by downwards bending the other side edge of the width direction of the horizontal plate, and the second side plate is positioned outside the heat insulation material.

According to one embodiment of the utility model, the clamping seat is provided with a temperature detection hole, and a temperature detector is buried in the temperature detection hole.

According to one embodiment of the utility model, a carrier plate is arranged in the shell, and at least two mounting plates are arranged on the carrier plate at intervals along the horizontal direction;

At least two photoelectric detection modules are in one-to-one correspondence with at least two mounting plates, each photoelectric assembly is arranged on the corresponding mounting plate, a positioning groove matched with the photoelectric assembly is formed in the bottom of the clamping seat, and the photoelectric assembly is positioned in the positioning groove.

According to one embodiment of the utility model, the side surface of the shell is provided with the code scanner, and the light emitting direction of the code scanner is different from the orientation of the card inserting hole.

According to one embodiment of the present utility model, the photoelectric assembly includes a plurality of photodetectors, the photodetectors are in one-to-one correspondence with the detection holes, each of the photodetectors is located below the corresponding detection hole, and at least one light source is disposed around each of the photodetectors to project light to the detection hole.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a multi-channel dry biochemical analyzer according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a multi-channel dry biochemical analyzer according to an embodiment of the present utility model;

FIG. 3 is a detailed exploded view of a multi-channel dry biochemical analyzer according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing the combination of the photoelectric detection module and the light shielding member in the multi-channel dry biochemical analyzer according to the embodiment of the present utility model;

FIG. 5 is an exploded view of a photoelectric detection module and a light shielding member of a multi-channel dry biochemical analyzer according to an embodiment of the present utility model;

FIG. 6 is an exploded view of the photo-detection module and the light shielding member of the multi-channel dry biochemical analyzer according to the embodiment of the present utility model.

Reference numerals:

10. A housing;

101. A carrier plate;

102. A mounting plate;

103. a display screen;

H10, inserting a card hole;

11. a code scanner;

20. a photoelectric detection module;

201. A clamping seat;

202. An optoelectronic component;

203. A thermal insulation material;

204. a heat insulating plate;

H201, clamping groove;

H202, detection holes;

h203 and a positioning groove;

30. a light shielding member;

301. a horizontal plate;

301a, a boss;

302. A first side plate;

303. a second side plate;

40. And (5) detecting the card.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following describes in detail a multi-channel dry biochemical analyzer according to an embodiment of the present utility model with reference to the accompanying drawings.

Referring to fig. 1 to 6, a multi-channel dry biochemical analyzer according to an embodiment of the present utility model includes a housing 10, at least two photoelectric detection modules 20, and at least two light shielding members 30.

In particular, the housing 10 is an external structure of the overall device, serving to protect internal components, provide structural support, and isolate the internal environment, for example, from external light effects on the test results. The front side of the housing 10 has at least two card insertion holes H10. These card insertion holes H10 allow a user to insert the sample-loaded test card 40 into the device for analysis. The housing 10 is typically made of a durable material, such as metal or plastic, to ensure stability and long life of the device. Each card insertion hole H10 corresponds to one photo detection module 20, allowing a plurality of detection cards 40 to be simultaneously analyzed.

At least two photoelectric detection modules 20 are arranged in the housing 10 at intervals along the horizontal direction and are in one-to-one correspondence with at least two card inserting holes H10, and each photoelectric detection module 20 is opposite to a corresponding card inserting hole H10 so as to allow a detection card 40 to be inserted into the photoelectric detection module 20 from the card inserting hole H10. That is, the photo-detection modules 20 are generally positioned inside the housing 10 in alignment with the card insertion holes H10 so that the detection cards 40 can be accurately inserted and analyzed. Each of the photo-detection modules 20 can operate independently, so that a plurality of the detection cards 40 can perform analysis simultaneously, which is very important for medical institutions and clinical laboratories requiring a large number of biochemical parameter detection, because it can process a plurality of samples simultaneously, saving time and improving efficiency.

At least two light shielding members 30 are disposed in the housing 10 and correspond to at least two of the photodetection modules 20 one by one, and each light shielding member 30 is disposed on the photodetection module 20 in a covering manner. The light shielding member 30 mainly shields external ambient light, so that it is ensured that the photodetection module 20 is not disturbed during the detection.

The procedure of using the dry biochemical analyzer of the present embodiment will be described briefly.

Sample and test card 40 pieces were prepared: a sample of the biological fluid of the patient, e.g., blood, urine, etc., is collected and subjected to appropriate pretreatment steps, such as centrifugation or dilution, as desired. The corresponding biochemical test cards 40 are acquired, ensuring that they are dry, without the need for liquid reagents.

Insert test card 40 sheet: looking at the card insertion holes H10 on the front side of the housing 10 ensures that the correct number of card insertion holes H10 is selected to match the number of tests to be performed. The biochemical test card 40 is inserted into each card insertion hole H10 to ensure correct and complete insertion.

And (3) starting analysis: ensure the detection environment is closed, start the dry biochemical analyzer, start to analyze the inserted detection card 40 automatically. The photoelectric detection module 20 measures the chemical reaction on the detection card 40 sheet and records the corresponding biochemical parameters.

Analysis results: when the analysis is completed, the results of the biochemical parameters may be displayed or output. These results typically include blood glucose, cholesterol, urea nitrogen, liver function indicators, and the like. The results may be viewed directly on the display screen 103 of the instrument or output by connection to a computer or printer.

According to the multi-channel dry biochemical analyzer provided by the embodiment of the utility model, the multi-channel dry biochemical analyzer is provided with at least two photoelectric detection modules 20, so that a plurality of detection cards 40 can be inserted at one time for detection, and the requirement of mass detection can be met. In addition, set up card insertion hole H10 on shell 10, photoelectric detection module 20 establishes in shell 10 inside and card insertion hole H10 is relative to set up light shield 30 in photoelectric detection module 20's top, so, can form the closed detection environment, and shade photoelectric detection module 20 with light shield 30 in shell 10 inside, and then can furthest reduce the influence of outside ambient light, has improved the accuracy and the reliability of testing result.

It will be appreciated that the dry biochemical analyzer may also include a display 103, a printer, etc. to implement basic functions such as interaction and output.

Referring to fig. 5 to 6, in one embodiment of the present utility model, the optoelectronic testing module 20 includes a card holder 201, a heating film and an optoelectronic component 202, the card holder 201 has a card slot H201, the card slot H201 is suitable for inserting the testing card 40, and the card slot H201 is suitable for inserting the testing card 40. The design of the card slot H201 enables a user to easily insert the test card 40 therein, ensuring accurate insertion of the test card 40 into the optoelectronic test module 20.

The bottom of the clamping groove H201 is provided with a plurality of detection holes H202, and the detection holes H202 are arranged at intervals along the length direction of the clamping groove H201. These holes are located at the bottom of the test card 40 for the reflected light generated after the chemical reaction to pass through. The light shielding member 30 covers the card holder 201 to further ensure that the light is not disturbed by external ambient light during the detection.

The heating film is disposed on the card holder 201 to heat the card holder 201. The main function of the heating film is to heat the cartridge 201. This is to accelerate the progress of the chemical reaction, particularly in the case where temperature control is required, to ensure the accuracy and rapidity of the reaction. The heating film is usually made of an electric heating element, and a constant heating effect can be achieved by controlling the temperature. This helps to maintain a desired reaction temperature in order to accurately measure the optical signal produced by the reaction.

The photoelectric assembly 202 is disposed at the bottom of the card holder 201, and the photoelectric assembly 202 is located below the plurality of detection holes H202, so as to emit excitation light to the detection holes H202 and receive the light emitted by the detection card 40, and then convert the light into a photoelectric signal. The photo-electric assembly 202 generally includes a light emitting member, a photo-sensing member, etc., which emits excitation light to the test card 40 to illuminate a chemically reactive area on the test card 40. The photo-sensing element can receive chemical reactions and generate optical signals and convert the optical signals into electrical signals. The electrical signals are processed and analyzed to obtain measurements related to the biochemical parameters.

The photoelectric detection module 20 of the present embodiment has a plurality of key components, including a card holder 201, a heating film and a photoelectric component 202, which cooperate to achieve efficient detection and measurement of chemical reactions on the biochemical detection card 40. Features of the design of the photodetection module 20 include the heating function of the heating film to help maintain the desired reaction temperature. This is very important for the performance of certain biochemical reactions, as temperature can significantly affect the rate and accuracy of the reaction. By accurate temperature control, the stability of the reaction condition is ensured, and the accuracy of the detection result is also improved. In addition, the influence of external ambient light is reduced by the light shielding member 30 to ensure accurate and reliable biochemical parameter measurement.

Referring to fig. 5 to 6, in an embodiment of the present utility model, the outer circumference of the card holder 201 is coated with a thermal insulation material 203 for preventing the temperature of the card holder 201 from being transmitted to the outside. In general, the insulating material 203 is a material having excellent heat insulating properties, such as insulating foam or insulating material. These materials can effectively reduce heat transfer and prevent the influence of external temperature fluctuation on the internal temperature of the cartridge 201.

By coating the outer periphery of the cartridge 201 with the heat insulating material 203, the influence of temperature fluctuation is effectively reduced. This is critical for applications requiring biochemical reactions under stringent temperature conditions, since the temperature inside cartridge 201 remains constant even if the external temperature varies. Temperature stability is a key factor in ensuring reaction accuracy and repeatability. The application of the thermal insulation material 203 keeps the temperature condition of the biochemical reaction stable, thereby ensuring accurate measurement results. In addition, the energy consumption can be reduced.

Advantageously, a heat insulation plate 204 is provided between the top surface of the holder 201 and the light shielding member 30. The heat shield 204 completely covers the top region of the cartridge 201, forming a heat shield separating the cartridge 201 from the shade 30. The heat shield 204 has a main function of preventing heat of the cartridge 201 from being transferred upward to the light shielding member 30. Helping to maintain a constant temperature under the shade 30, ensuring that the reaction zone is in a stable temperature condition, thereby ensuring accurate measurement results.

Referring to fig. 4 to 6, in one embodiment of the present utility model, the light shielding member 30 includes a horizontal plate 301, a first side plate 302 and a second side plate 303, a boss 301a protruding upward is formed in the middle of the horizontal plate 301, and a cavity is formed in the boss 301 a.

The first side plate 302 is formed by bending down one side edge of the horizontal plate 301 in the width direction, and the first side plate 302 is located outside the thermal insulation material 203. The second side plate 303 is formed by bending down the other side edge of the horizontal plate 301 in the width direction, and the second side plate 303 is located outside the thermal insulation material 203.

In this embodiment, the first side plate 302 and the second side plate 303 are respectively located at two sides of the horizontal plate 301 to form a cover structure, and cover the clamping seat 201 and the thermal insulation material 203, so that a better light shielding effect can be achieved. The boss 301a protruding from the middle of the horizontal plate 301 forms a cavity therein, and the structural design makes the inner top surface of the boss 301a form a larger distance from the lower clamping seat 201. When detecting the air conditioner value, the inner top surface of the boss 301a is not too close to the photoelectric module at the lower side, if the inner top surface of the shading piece 30 is too close to the photoelectric module 202, excessive light rays can be reflected to enter the photoelectric module 202, and the accuracy of the detection result is further affected.

The space-time value refers to a value read without inserting the detection card 40. The data is a value inherent to the analyzer itself and corresponds to the starting point value of the actual test. In actual detection, the detection result is obtained by subtracting the value from the detection result.

Preferably, the card holder 201 is provided with a temperature detection hole, and a temperature detector is embedded in the temperature detection hole. The temperature detector can accurately monitor the temperature of the card holder 201 so as to perform real-time temperature control and monitoring. The presence of the temperature detection holes and the temperature detector helps to control the reaction temperature more precisely. The control system can be adjusted in time according to the actual temperature data, so that the reaction is ensured to be carried out under the constant temperature condition, and the accuracy of biochemical detection is ensured.

Referring to fig. 2 to 3, in one embodiment of the present utility model, a carrier plate 101 is disposed in a housing 10, and the carrier plate 101 is a plate-like member disposed horizontally. At least two mounting plates 102 are arranged on the carrier plate 101 at intervals along the horizontal direction. Each mounting plate 102 is used to mount and position the photo-detection module 20.

At least two photoelectric detection modules 20 are in one-to-one correspondence with at least two mounting plates 102, each photoelectric assembly 202 is arranged on the corresponding mounting plate 102, a positioning groove H203 matched with the photoelectric assembly 202 is arranged at the bottom of the clamping seat 201, and the photoelectric assembly 202 is positioned and arranged in the positioning groove H203. The locating slot H203 helps to ensure that the photodetection module 20 is accurately located in the correct position for accurate measurement.

In this embodiment, by combining the photodetection module 20 with the mounting plate 102 and the positioning groove H203, highly accurate positioning can be achieved. Accurate alignment between the optoelectronic package 202 and the detection aperture H202 is ensured, thereby improving accuracy and stability of measurement. In addition, the photoelectric assembly 202 is positioned in the positioning groove H203, so that accidental displacement during the operation of the instrument can be prevented, and the consistency of measurement is maintained.

Referring to fig. 1 to 2, in some embodiments of the present utility model, a code scanner 11 is disposed on a side surface of the housing 10, and a light emitting direction of the code scanner is different from an orientation of the card insertion hole H10.

The code scanner 11 can be used for scanning two-dimensional codes and the like on the detection card 40, so that a user can conveniently and rapidly scan the two-dimensional codes or other identifiers on the detection card 40 in the operation process, related information can be rapidly acquired, and the detection efficiency is improved. In addition, since the light emitting direction of the code scanner 11 is different from the orientation of the card insertion hole H10, for example, the card insertion hole H10 is oriented forward, and the light emitting direction of the code scanner 11 is oriented backward. Thus, in operation, the light of the code scanner 11 does not irradiate to the side where the user is located, and the discomfort and other problems are avoided.

In one embodiment of the present utility model, the photo-electric assembly 202 includes a plurality of photo-detectors, where the photo-detectors are in a one-to-one correspondence with the detection holes H202, and each of the photo-detectors is located below the corresponding detection hole H202, and at least one light source is disposed around each of the photo-detectors to project light to the detection hole H202.

The light source is used to generate light and project it to the corresponding reaction area of the test card 40. Each photodetector is responsible for measuring the light reflected by the corresponding reaction area of the detection card 40, that is, the light of the light source is projected to the reaction area, and the light reflected by the reaction area is projected downward from the detection hole H202 to the photodetector, which converts the optical signal into an electrical signal.

In this embodiment, at least one light source is disposed around each photodetector, so that it is ensured that light can uniformly irradiate a reaction area on the inspection card, and accuracy of the detection result is further improved.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A multi-channel dry biochemical analyzer, comprising:

The front side of the shell is provided with at least two card inserting holes;

2. The multi-channel dry biochemical analyzer according to claim 1, wherein the photodetection module comprises:

3. The multi-channel dry biochemical analyzer according to claim 2, wherein the outer circumference of the cartridge is coated with a thermal insulation material for preventing the temperature of the cartridge from being transferred to the outside.

4. The multi-channel dry biochemical analyzer according to claim 2, wherein a heat insulating plate is provided between the top surface of the cartridge and the light shielding member.

5. The multi-channel dry biochemical analyzer according to claim 3, wherein the light shielding member comprises:

6. The multi-channel dry biochemical analyzer according to claim 2, wherein the cartridge is provided with a temperature detection hole, and a temperature detector is embedded in the temperature detection hole.

7. The multi-channel dry biochemical analyzer according to claim 2, wherein a carrier plate is arranged in the housing, and at least two mounting plates are arranged on the carrier plate at intervals along the horizontal direction;

8. The multi-channel dry biochemical analyzer according to claim 2, wherein a code scanner is arranged on a side surface of the housing, and a light emitting direction of the code scanner is different from an orientation of the card insertion hole.

9. The multi-channel dry biochemical analyzer according to claim 2, wherein the photoelectric assembly comprises a plurality of photoelectric detectors, the plurality of photoelectric detectors are in one-to-one correspondence with the plurality of detection holes, each photoelectric detector is located below the corresponding detection hole, and at least one light source is arranged around each photoelectric detector to project light to the detection hole.