A backside illuminated photodiode and method of assembly

Abstract

The application relates to a kind of to the type photoelectric sensor and assembly method, including the transmitter and receiver needing symmetrical arrangement, the receiver is used to receive the light signal emitted by the transmitter, the transmitter includes first shell, transmitting lens, first PCB board, lamp plate and transmitting lamp, the transmitting lens is inlaid on the first shell, lamp hole is formed in the lamp plate, the transmitting lamp is welded on the lamp plate, and is clamped in the lamp hole, the first shell is provided with a limiting block, the lamp plate is installed on the limiting block, the first PCB board is inserted on the limiting block, and is clamped with the lamp plate, so that the wick of transmitting lamp and the optical center of transmitting lens can be aligned.The application has the effect that the wick of transmitting lamp and the optical center of transmitting lens are aligned.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photoelectric sensor, in particular to a kind of against type photoelectric sensor and assembly method. BACKGROUND

[0002] At present, photoelectric sensor is a kind of device for converting optical signal into electrical signal.Usually, by the three parts of transmitter, receiver and detection circuit.Concerning the against type photoelectric sensor, transmitter and receiver are two independent devices, and in normal use, the two independent devices need to be installed in opposite positions.

[0003] Specifically, refer to Figure 1 In the prior art similar products, the transmitter mostly has only one PCB mainboard 52, and the transmitting lamp 6 and other elements are welded on the PCB mainboard 52.A transmitting lens 31 is installed on the transmitter shell.In actual assembly process, the lampwick of the transmitting lamp 6 and the center of the transmitting lens 31 need to be concentric, otherwise the light spot emitted by the transmitting lamp 6 will be seriously deviated.But in the process of welding the transmitting lamp 6 on the PCB mainboard 52, the operator is easy to weld the transmitting lamp 6 skew, or the PCB mainboard 52 is not accurately installed in the transmitter shell, which indirectly leads to the position deviation of the transmitting lamp 6 and the transmitting lens 31.The lampwick of the transmitting lamp 6 on the PCB mainboard 52 cannot be aligned with the transmitting lens 31 of the transmitter shell in the above two cases.

[0004] For the related technology in the above, the inventor believes that the transmitting lamp welding process is not easy to align with the transmitting lens. SUMMARY

[0005] A kind of against type photoelectric sensor, including the transmitter and receiver that need to be symmetrically arranged, the receiver is used to receive the optical signal emitted by the transmitter, the transmitter includes first shell, transmitting lens, first PCB board, lamp plate and transmitting lamp, the transmitting lens is inlaid in the first shell, the lamp hole is opened in the lamp plate, the transmitting lamp is welded on the lamp plate and is clamped in the lamp hole, the first shell is provided with a limiting block, the lamp plate is detachably installed on the limiting block, the first PCB board is inserted on the limiting block and is clamped with the lamp plate, so that the lampwick of the transmitting lamp and the optical center of the transmitting lens are aligned.

[0006] Compared with the prior art of directly welding the lamp plate on the first PCB, the lamp plate and the first PCB are divided into two assemblies and are separately installed in the first shell, so that the position of the emitting lamp of the lamp plate can be conveniently adjusted and stabilized. Only the position of the limiting block needs to be defined, the position of the lamp plate can be preliminarily fixed, and the first PCB is inserted on the limiting block and the lamp plate, so that the position of the lamp plate can be further stabilized. Therefore, the wick of the emitting lamp and the optical center of the emitting lens can be indirectly arranged on the same horizontal line, and the problem of poor centering between the wick of the emitting lamp and the center of the emitting lens in the prior art is solved. Meanwhile, the failure rate in the process of assembly and production is reduced, the manufacturing cost of the overall product is reduced, and the product is more manufacturable.

[0007] Preferably, the limiting block is installed on the side wall in which the emitting lens is embedded, the limiting block is longitudinally provided with a limiting groove, and the lamp plate is clamped on the limiting groove.

[0008] By adopting the above technical scheme, the lamp plate with the emitting lamp is clamped on the limiting block, the limiting block is close to the emitting lens, and the lamp plate is accurately positioned, so that the accurate positioning is indirectly realized. Moreover, the lamp plate and the first PCB are independently installed, and if one of them has a problem, only the problematic one needs to be handled, thereby reducing the cost of defective products.

[0009] Preferably, the limiting block is two, the limiting grooves are symmetrically arranged, the slot openings are opposite, and the lamp plate abuts against the groove bottom of the limiting groove.

[0010] By adopting the above technical scheme, compared with fixing the lamp plate by only one limiting block, the two limiting blocks clamp the two sides of the lamp plate respectively, and the lamp plate is fixed more firmly. Moreover, the lamp plate is directly placed in the two limiting grooves, and the position of the lamp plate does not need to be adjusted, thereby greatly improving the efficiency of workers in assembling the product.

[0011] Preferably, the slot opening of the limiting groove is provided with a guide slope, and the guide slope is used for inserting the lamp plate into the limiting groove from top to bottom.

[0012] By adopting the above technical scheme, the guide slope is arranged at the slot opening of the limiting groove, so that the workers can more easily insert the lamp plate into the limiting groove when assembling the lamp plate.

[0013] Preferably, a limiting column is fixedly installed on the limiting block, a limiting hole is formed on the first PCB, and the first PCB is inserted on the limiting column through the limiting hole.

[0014] By adopting the technical scheme, the first PCB plate is an important part of the sensor and needs to be stably installed in the first shell, the first PCB plate is inserted on the limiting column, and the first PCB plate is installed and stabilized in a simple and quick manner.

[0015] Preferably, the limiting column has a cross-sectional area decreasing from the bottom end to the top end.

[0016] By adopting the technical scheme, the limiting column is thin at the top and thick at the bottom, the first PCB plate is conveniently inserted on the limiting column, and the first PCB plate is inserted on the limiting column more tightly.

[0017] Preferably, the first shell is provided with a first shell cover, a first clamping block is attached to the inner side wall of the first shell, the first PCB plate is located in the first clamping block, the height difference between the first clamping block and the upper surface of the first shell is consistent with the thickness of the first shell cover, the first clamping block abuts against the first shell cover, and the upper surface of the first shell cover is flush with the upper surface of the first shell.

[0018] By adopting the technical scheme, the first clamping block abuts against the first shell cover, the first shell cover is covered on the first shell to form a complete device, meanwhile, the upper surface of the first shell cover is flush with the upper surface of the first shell, the space structure of the sensor is saved, and the sensor looks more beautiful.

[0019] Preferably, a second clamping block is attached to the side wall of the first clamping block, the second clamping block is located opposite the limiting block, the height of the second clamping block is consistent with the height of the limiting block, and the second clamping block abuts against the first PCB plate.

[0020] By adopting the technical scheme, the height of the first PCB plate inserted on one end of the limiting block is consistent with the height of the end away from the limiting block, the first PCB plate is horizontally installed in the first shell, the weight of the sensor is evenly distributed, and the first PCB plate is more stably installed.

[0021] Preferably, a signal line groove is formed in the first shell for the signal line to pass out, a dispensing groove for storing industrial glue is formed in the signal line groove, and a convex ring for further limiting the position of the signal line is protruded from the side wall of the signal line groove.

[0022] By adopting the technical scheme, the signal line is led out of the sensor, the wire at the signal line groove is prone to loosening with the longer use time. Therefore, the dispensing groove is arranged at the signal line groove, the staff member points the glue in the dispensing groove, and the glue can paste the local signal line and the first shell together. In order to further fasten the signal line on the sensor, the convex ring at the signal line groove fastens and limits the signal line.

[0023] An assembling method is provided, which comprises the following steps: welding the emitting lamp on the lamp plate, clamping the emitting lamp in the lamp hole, clamping the lamp plate in the limiting groove, so that the lamp wick of the emitting lamp is preliminarily aligned with the optical center of the emitting lens, inserting the first PCB plate on the limiting column and clamping the first PCB plate and the lamp plate synchronously, so as to further stabilize the position of the lamp plate, and finally covering the first shell cover, so that the first shell cover is connected with the first shell body.

[0024] By adopting the above technical scheme, the lamp plate and the first PCB plate are assembled separately and then welded as a whole, so that the whole assembling process is simple and fast. After the optical center of the emitting lens is ensured to be consistent with the lamp wick of the emitting lamp, the first PCB plate is installed, so that the failure rate of the sensor can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the internal structure of the emitter of the existing photoelectric sensor.

[0026] Figure 2 is a schematic diagram of the overall structure of the photoelectric sensor.

[0027] Figure 3 is an exploded schematic diagram of the emitter.

[0028] Figure 4 is a partial schematic diagram of the emitter.

[0029] Figure 5 is a partial schematic diagram of the emitter.

[0030] Figure 6 is a partial schematic diagram of the emitter.

[0031] Figure 7 is a partial schematic diagram of the first shell body of the emitter.

[0032] Figure 8 is a schematic diagram of the first shell cover of the emitter.

[0033] BRIEF DESCRIPTION OF DRAWINGS: 1, first shell body; 11, first shell cover; 12, mounting hole; 2, second shell body; 21, second shell cover; 31, emitting lens; 32, receiving lens; 4, limiting block; 41, limiting groove; 42, limiting column; 43, extension block; 44, inclined surface; 5, lamp plate; 51, welding pad; 52, PCB main plate; 53, lamp hole; 6, emitting lamp; 71, first clamping block; 72, second clamping block; 81, dispensing groove; 82, protruding ring; 91, first signal line; 92, second signal line; 93, signal line groove; 94, recessed block; 10, first PCB plate; 101, limiting hole; 102, recess. DETAILED DESCRIPTION

[0034] With reference to Figure 2 A kind of to the light type photoelectric sensor includes emitter and receiver, receiver and emitter are symmetrically arranged, receiver can receive light signal emitted from emitter.Receiver includes second shell 2, second shell cover 21, second PCB plate (not marked in figure), second signal line 92 and receiving lens 32, second shell 2 and second shell cover 21 are clamped together, second PCB plate is fixedly installed in second shell 2, receiving lens 32 is embedded in the side of second shell 2, second signal line 92 is electrically connected with second PCB plate, to facilitate the conduction of electric signal, second signal line 92 is inserted from the bottom of second shell 2.

[0035] With reference to Figure 3 Emitter includes first shell 1, first shell cover 11, first PCB plate 10, first signal line 91, emitting lens 31, lamp plate 5 and emitting lamp 6, emitting lens 31 is embedded in the side of first shell 1, a pair of limit blocks 4 are installed in first shell 1, the shape of limit block 4 can be rectangular, cylindrical, polygonal, and in the embodiment, it is selected as rectangular, and one side of limit block 4 is fixedly connected with the side of first shell 1 where emitting lens 31 is installed.

[0036] With reference to Figure 3 The shape of first PCB plate 10 is consistent with the shape of the front face of first shell 1, two limit holes 101 are formed in first PCB plate 10, limit hole 101 is inserted with limit column 42, and first PCB plate 10 is inserted on limit column 42.An irregular recess 102 is formed in first PCB plate 10, recess 102 can be matched with part of lamp plate 5 higher than limit block 4, so as to further fix lamp plate 5.

[0037] With reference to Figure 4 Two limit slots 41 are formed in two limit blocks 4, two limit slots 41 are symmetrically arranged, and the slots are opposite, the shape of limit slot 41 is not limited, and the shape of the object inserted therein corresponds.In this embodiment, the object inserted therein is rectangular lamp plate 5, and after insertion, the two sides of lamp plate 5 abut against the groove bottom of limit slot 41.A guide inclined surface 44 is arranged in the slot opening for inserting lamp plate 5, the inclined surface 44 is inclined downward and the bottom end faces lamp plate 5, and lamp plate 5 can be more easily inserted into limit slot 41 along inclined surface 44 from top to bottom.

[0038] With reference to Figure 4The limiting block 4 is provided with an extension block 43, and a limiting column 42 is integrally connected to the extension block 43. The shape of the extension block 43 is matched with the shape of the limiting column 42. The shape of the limiting column 42 can be a cylindrical type or a multi-prism type, and is a cylindrical type in this embodiment. The extension block 43 has a semicircular cross section. The limiting column 42 is connected to the upper surface of the joint part of the extension block 43 and the limiting block 4. The cross-sectional area of the bottom end of the limiting column 42 is larger than that of the top end. The radius of the cross section of the limiting column 42 gradually decreases from the bottom end to the top end.

[0039] With reference to Figure 5 A lamp hole 53 is formed in the lamp plate 5 (see Figure 4 ). The lamp hole 53 is opposite to the emitting lens 31. The emitting lamp 6 is welded to the lamp plate 5. The wick of the emitting lamp 6 is located in the range of the lamp hole 53, so that the wick of the emitting lamp 6 is on the same horizontal line as the optical center of the emitting lens 31. The shape of the lamp hole 53 is determined by the field of view required by the light emitted by the emitting lamp 6.

[0040] With reference to Figure 5 and Figure 6 The first clamping block 71 and the second clamping block 72 are arranged on the inner side wall of the first shell 1 opposite to the emitting lens 31. The height of the first clamping block 71 is higher than that of the second clamping block 72. The height of the second clamping block 72 is consistent with the height of the limiting block 4. The first PCB 10 inserted on the limiting column 42 is in abutment with the bearing surface of the second clamping block 72, so that the first PCB 10 is kept horizontal. The depth from the upper surface of the first shell 1 to the upper surface of the first clamping block 71 is consistent with the thickness of the first shell cover 11 (see Figure 3 ). When the first shell cover 11 is covered on the first shell 1, the first clamping block 71 is in abutment with the first shell cover 11. At this time, the upper surface of the first shell 1 is flush with the upper surface of the first shell cover 11.

[0041] With reference to Figure 6 The first shell 1 is provided with mounting holes 12. The number of the mounting holes 12 is not limited, as long as the number can fix the emitter. The depth of the mounting hole 12 is smaller than the thickness of the first shell 1. After a bolt passes through the mounting hole 12, a nut can be accommodated in the first shell 1.

[0042] With reference to Figure 7 The first shell 1 is provided with a signal line groove 93 at the bottom end. The radius of the groove gradually decreases as the signal line groove 93 extends outward. The opening of the signal line groove 93 is semicircular and communicates the inside and outside of the first shell 1, so as to facilitate the first signal line 91 (see Figure 6The first shell 1 is provided with a signal line slot 93 which is arranged on the bottom of the first shell 1. A dot gluing groove 81 is arranged on the signal line slot 93, and a convex ring 82 is arranged beside the dot gluing groove 81. The dot gluing groove 81 and the convex ring 82 surround the first signal line 91. Industrial glue is poured into the dot gluing groove 81, and the glue is used to paste the first signal line 91 and the first shell 1 together. The convex ring 82 clamps the first signal line 91, and further fastens the first signal line 91.

[0043] In the embodiment, the number of the dot gluing groove 81 and the convex ring 82 is not limited, as long as the number can fasten the first signal line 91 on the first shell 1.

[0044] Referring to Figure 7 and Figure 8 , the first shell cover 11 is provided with a concave block 94 at the bottom end, and the concave block 94 cooperates with the signal line slot 93 to fasten and limit the first signal line 91 (referring to Figure 6 ).

[0045] The assembling method of the reflection type photoelectric sensor is as follows: the emitting lamp 6 is welded on the lamp plate 5 and is clamped in the lamp hole 53, the lamp plate 5 is clamped in the limiting slot 41, the emitting lamp 6 is aligned with the emitting lens 31, the first PCB plate 10 is inserted in the limiting column 42 and is clamped with the lamp plate 5 at the same time, and finally the first shell cover 11 is covered to connect the first shell cover 11 and the first shell 1.

[0046] The embodiment of the assembling method of the reflection type photoelectric sensor is as follows: the emitting lamp 6 is welded on the lamp plate 5, the lamp plate 5 is fixed in the first shell 1, the emitting lamp 6 is aligned with the emitting lens 31, and then the first PCB plate 10 is fixed and is welded with the lamp plate 5, so as to further stabilize the lamp plate 5.

[0047] The above are the preferred embodiments of the present application, and are not used to limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. A through-beam photoelectric sensor, characterized in that, The application relates to a light-emitting device comprising a symmetrically arranged transmitter and receiver, the receiver being used for receiving the light signal emitted by the transmitter, the transmitter comprising a first shell (1), a transmitting lens (31), a first PCB plate (10), a lamp plate (5) and a transmitting lamp (6), the transmitting lens (31) being inlaid on the first shell (1), the lamp plate (5) being provided with a lamp hole (53), the transmitting lamp (6) being welded on the lamp plate (5) and clamped in the lamp hole (53), a limiting block (4) being arranged in the first shell (1), the lamp plate (5) being detachably mounted on the limiting block (4), the first PCB plate (10) being inserted on the limiting block (4) and clamped with the lamp plate (5), so that the lamp wick of the transmitting lamp (6) is aligned with the optical center of the transmitting lens (31). The limiting block (4) is mounted on the side wall in which the transmitting lens (31) is inlaid, the limiting block (4) is longitudinally provided with a limiting groove (41), and the lamp plate (5) is clamped on the limiting groove (41). The limiting block (4) is composed of two limiting blocks, the limiting grooves (41) are symmetrically arranged, and the groove openings are opposite to each other, the lamp plate (5) abuts against the groove bottom of the limiting groove (41). The limiting block (4) is fixedly provided with a limiting column (42), the first PCB plate (10) is provided with a limiting hole (101), and the first PCB plate (10) is inserted on the limiting column (42) through the limiting hole (101). The first shell (1) is provided with a signal line groove (93) for signal lines.

2. A one-sided phototransistor according to claim 1, wherein: The groove opening of the limiting groove (41) is provided with a guide inclined surface (44), the guide inclined surface (44) is used for inserting the lamp plate (5) into the limiting groove (41) from top to bottom.

3. A back-to-back photodetector according to claim 1, wherein: The cross-sectional area of the limiting column (42) decreases from the bottom end to the top end.

4. A back-to-back photodetector according to claim 1, wherein: The first shell (1) is matched with a first shell cover (11), a first clamping block (71) is attached to the inner side wall of the first shell (1), the first PCB plate (10) is located in the middle of the first clamping block (71), the height difference between the first clamping block (71) and the upper surface of the first shell (1) is consistent with the thickness of the first shell cover (11), the first clamping block (71) abuts against the first shell cover (11), and the upper surface of the first shell cover (11) is flush with the upper surface of the first shell (1).

5. A back-to-back photodetector according to claim 4, wherein: A second clamping block (72) is attached to the side wall of the first clamping block (71), the second clamping block (72) is located opposite to the limiting block (4), the height of the second clamping block (72) is consistent with the height of the limiting block (4), and the second clamping block (72) abuts against the first PCB plate (10).

6. A one-sided phototransistor according to claim 1, wherein: The signal line groove (93) is provided with a glue dispensing groove (81) for storing industrial glue, and the side wall of the signal line groove (93) is protrudingly provided with a convex ring (82) for further limiting the position of the signal line.

7. An assembly method for the photo sensor according to any one of claims 1 to 6, characterized in that: The emitting lamp is welded on the lamp plate, and the emitting lamp is clamped in the lamp hole, and the lamp plate is clamped in the limiting groove, so that the lamp wick of the emitting lamp is preliminarily aligned with the optical center of the emitting lens, the first PCB plate is inserted on the limiting column and is clamped with the lamp plate at the same time, so as to further stabilize the position of the lamp plate, and finally the first shell cover is covered, so that the first shell cover is connected with the first shell body.

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