CN212082412U

CN212082412U - Integrated small photoelectric coding module

Info

Publication number: CN212082412U
Application number: CN202021092256.7U
Authority: CN
Inventors: 申文忠
Original assignee: Jiangsu Ruixinyuan Technology Co ltd
Current assignee: Jiangsu Ruixinyuan Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-06-12
Publication date: 2020-12-04
Anticipated expiration: 2030-06-12

Abstract

The utility model discloses an integrated small-sized photoelectric coding module, relating to the field of photoelectric coders, the module integrates the emitter and the receiver into a whole through the lead frame to form a module, the emitter and the receiver are abutted and installed through the base and are positioned through the positioning pin and the positioning hole structure, the centering requirement between the emitter and the receiver is ensured, the lens seat and the mounting plate structure are combined into a whole and are integrally formed, the structure is simplified, the effect of modularized integral installation can be achieved, the structural design of the two bases can form parallel channels after assembly and have stable clearance, ensure the alignment of the optical center and the chip center, meanwhile, the working distance between the light source and the photoelectric conversion chip can be effectively ensured to reach the design precision, the irradiation area of the light source on the photoelectric conversion chip is effectively increased, the light spot quality is improved, and the original signal quality is effectively improved.

Description

Integrated small photoelectric coding module

Technical Field

The utility model belongs to the technical field of photoelectric encoder and specifically relates to a small-size photoelectric encoding module of integral type.

Background

The photoelectric encoder is a sensor which converts mechanical geometric displacement of an output shaft into pulse or digital quantity through photoelectric conversion, is mainly applied to various numerical control equipment, and is the sensor which is most applied at present.

Referring to a conventional structure diagram of the photoelectric encoder shown in fig. 1, the photoelectric encoder is mainly composed of a code disc 1 and a photoelectric encoding module, the code disc 1 is a circular grating disc composed of a series of regular scribed lines, the photoelectric encoding module mainly includes a signal transmitting part 2 and a signal receiving part 3, the signal transmitting part 2 is mainly a light source composed of a light emitting diode and a lens, and the signal receiving part 3 is mainly a circuit board with a chip. The signal transmitting portion 2 is mounted on the bottom surface of the housing 4, and the signal receiving portion 3 is mounted on the post of the housing 4. The coded disc 1 is arranged between the signal transmitting part 2 and the signal receiving part 3, is arranged on an output shaft 6 through a grating support 5, is linked with the output shaft 6, and is matched and connected with the seat body 4 through a bearing 7. The coded disc 1 is a signal reference and is coaxial with the motor, so that the coded disc 1 is driven to rotate by the rotation of the motor, light emitted by the signal emitting part 2 is received, identified and processed into a plurality of pulse signals by the signal receiving part 3 through a bright and dark area of the coded disc 1 and then output, and the rotating speed of the motor can be calculated according to the pulse number per second of the output signals.

However, the performance of the existing photoelectric encoder with such a structure depends on the matching size of each component, and especially the requirement on the matching accuracy of the signal transmitting part 2 and the signal receiving part 3 is high: on one hand, because the light rays are diverged at a certain angle, if the distance between the light rays and the light rays is too large, the signal is weak, the range of the received light rays is small, and the quality of the original signal is reduced, and on the other hand, because the coded disc 1 is a moving part, particularly under the condition of high-speed movement, if the distance between the coded disc 1 and the light rays is too small, the required gap under the condition of movement of the coded disc 1 is difficult to ensure. Therefore, the height between the signal transmitting part 2 and the signal receiving part 3 needs to be ensured in a specified range, in addition, due to the existence of accumulated errors of all parts, the processing precision of all the parts and the assembly process requirement of a product are very high, the self size of each part and the deviation of the matching size influence the performance of the encoder, the processing and production difficulty is high, and the reliability of the encoder is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

The inventor of the present invention provides a small-size photoelectric coding module of integral type to above-mentioned problem and technical demand, the technical scheme of the utility model as follows:

an integrated small photoelectric coding module comprises a transmitter, a receiver and a lead frame; the emitter comprises a lens seat, a lens and a light source, the lens seat comprises a working surface and a non-working surface, a lens mounting center is arranged at the working surface of the lens seat, the first end of the lead frame is fixed in the lens seat, the light source is fixedly crystallized on the first end of the lead frame and is positioned at the lens mounting center, and the lens is mounted at the lens mounting center and clings to the light source; the lens base is respectively provided with L-shaped mounting plate structures at two sides of the non-working surface, the vertical parts of the L-shaped mounting plates at the two sides are vertical to the non-working surface of the lens base, the horizontal parts of the L-shaped mounting plates at the two sides are parallel to the non-working surface of the lens base, the horizontal parts of the L-shaped mounting plates at the two sides are arranged in a back-to-back manner and are positioned at the outer side of the non-working surface of the lens base, and the horizontal parts of the L-shaped mounting plates at; the non-working surface of the lens seat is also provided with a positioning pin;

the receiver comprises a chip seat and a photoelectric conversion chip, the chip seat comprises a working surface and a non-working surface, a chip groove is formed in the working surface of the chip seat, the second end of the lead frame is fixed in the chip seat, and the photoelectric conversion chip is located in the chip groove and is fixedly crystallized on the second end of the lead frame; a positioning hole is formed in the non-working surface of the chip seat;

the first end and the second end of the lead frame are of a bent structure, the emitter and the receiver are arranged in opposite directions, the chip holder is clamped between the vertical parts of the L-shaped mounting plates on the two sides of the lens holder, a step structure is formed between the working surface and the non-working surface of at least one base in the lens holder and the chip holder, the lens holder is abutted against the two non-working surfaces of the chip holder, a positioning pin on the lens holder is in transition fit with a positioning hole on the chip holder, the lens holder and the two working surfaces of the chip holder are parallel to each other and are separated by a preset distance to form a parallel channel, and the light source center of the light source, the lens center of the lens and the chip center of the photoelectric conversion; the integrated small photoelectric coding module is arranged in 2 of the photoelectric encoder through waist-shaped holes in L-shaped mounting plates on two sides of the lens seat, and the edge working belt of the motion code disc is arranged in a parallel channel between the lens seat and the chip seat.

The technical scheme is that the head of the positioning pin on the lens holder is provided with a chamfer, the caliber of the positioning hole on the chip holder is provided with an inclined chamfer, and the depth of the positioning hole is larger than the length of the positioning pin.

The chip seat is provided with two raised mounting positioning pins on the other side relative to the chip groove, and the central connecting line of the two mounting positioning pins is vertical to the central connecting line of the two waist-shaped holes.

The further technical scheme is that the light source and the lens are embedded in the lens seat, and the lens is lower than the working surface of the lens seat; the photoelectric conversion chip is embedded in the chip seat and is lower than the working surface of the chip seat.

The utility model has the beneficial technical effects that:

the application discloses small-size photoelectric coding module of integral type, this module is integrated into a module through lead frame with transmitter and receiver one-tenth an organic whole, transmitter and receiver pass through the installation of base butt, fix a position through locating pin and locating hole structure, the centering requirement between transmitter and the receiver has been guaranteed, lens seat unites two into one with mounting panel structure, integrated into one piece, the structure is retrencied, the effect of modularization unit mount can be reached, and the structural design of two bases can form parallel passageway and have stable clearance after the assembly, the alignment of optical center with the chip center has been ensured, can effectively guarantee light source and photoelectric conversion interchip working distance's design precision simultaneously, effectively improve the light irradiation area to the photoelectric conversion chip of light source, effectively improve original signal quality. The design of waist type hole and installation locating pin can ensure that the degree of freedom of product installation is limited, and the location is accurate, the installation of simplification.

Drawings

Fig. 1 is a conventional configuration diagram of a conventional photoelectric encoder.

FIG. 2 is a block diagram of one view of the integrated small electro-optical coding module of the present application.

Fig. 3 is an expanded schematic view of the structure of the integrated small-sized photoelectric coding module of the present application.

FIG. 4 is a block diagram of another perspective of the integrated small electro-optical coding module of the present application.

Fig. 5 is a schematic view of an application scenario of the integrated small-sized photoelectric coding module of the present application.

Detailed Description

The following describes the embodiments of the present invention with reference to the accompanying drawings.

The application discloses small-size photoelectric coding module of integral type please join the assembly structure shown in fig. 2, and this small-size photoelectric coding module of integral type includes emitter 21, receiver 22 and lead frame 23, and emitter 21 and receiver 22 directly link to each other through lead frame 23 and become integrated into one piece, and lead frame 23 draws forth the line pin simultaneously.

Referring to the expanded view of the structure shown in fig. 3, the emitter 21 includes a lens holder, a lens and a light source, the lens holder includes a working surface 211 and a non-working surface 212, and a lens mounting center 213 is disposed at the working surface 211 of the lens holder, it should be noted that, for clarity of illustration, fig. 3 shows the lens mounting center 213 as a small hole, but the actual lens mounting center is virtual and is usually directly achieved by positioning during injection molding. The lens holder is formed with L type mounting plate structure 214 respectively in the both sides of non-working face 212 department, and the perpendicular part of the L type mounting plate 214 of both sides all is perpendicular to the non-working face 212 of lens holder, and the horizontal part all is on a parallel with the non-working face 212 of lens holder, and the horizontal part of the L type mounting plate 214 of both sides sets up back to back and all is located the non-working face 212 outside of lens holder, and waist type hole 215 has been seted up respectively to the horizontal part of the L type mounting plate 214 of both sides. The non-working surface 212 of the lens holder is further provided with a positioning pin 216, and the head of the positioning pin 216 is chamfered for guiding. In the present application, two positioning pins 216 are disposed on the non-working surface 212 of the lens holder, and a central line of the two positioning pins 216 is parallel to a central line of the two kidney-shaped holes 215.

The first end of the lead frame 23 is fixed in the lens holder and can be connected with the lens holder into a whole through processes such as injection molding, a part of the first end of the lead frame 23 is exposed out of the lens mounting center 213, and the rest is embedded in the lens holder. The light source is die-bonded to the first end of the lead frame and receives power input through the lead frame 23, the light source being located at the lens mounting center 213. The portion of the lead frame 23 exposed from the lens mounting center 213 abuts against the mounting surface of the lens, and the lens is closely attached to the light source without a gap, and the lens center of the lens is aligned with the light source center of the light source. In this application, light source and lens are all embedded in the inside of lens seat, and lens are less than the working face of lens seat, the fine protection device of semi-enclosed state.

The receiver 22 includes a chip holder and a photoelectric conversion chip 221, the chip holder includes a working surface 222 and a non-working surface 223, the non-working surface 223 of the chip holder is provided with positioning holes 224, and the positions of the positioning holes 224 match with the positioning pins 216. The diameter of the positioning hole 224 is provided with an inclined chamfer for guiding, and the depth of the positioning hole 224 is larger than the length of the positioning pin 216. In the present application, two positioning holes 224 are also disposed on the non-working surface 223 of the chip holder, and the line connecting the centers of the two positioning holes 224, the line connecting the centers of the two positioning pins 216, and the line connecting the centers of the two kidney-shaped holes 215 are parallel.

A chip slot is formed in the working surface 222 of the chip holder, the second end of the lead frame 23 is fixed in the chip holder, and similarly, injection molding and other processes can be adopted, a part of the second end of the lead frame 23 is exposed in the chip slot, and the rest is embedded in the chip holder. The photoelectric conversion chip 221 is located in the chip slot and is die-bonded on the second end of the lead frame 23. In this application, the photoelectric conversion chip 221 is embedded in the chip holder and is lower than the working surface of the chip holder, so that the working device is well protected in a semi-closed state.

In the present application, as shown in fig. 4, the chip holder is provided with two convex mounting positioning pins 225 on the other side relative to the chip slot, and the central connecting line of the two mounting positioning pins 225 is perpendicular to the central connecting line of the two positioning holes 224, the central connecting line of the two positioning pins 216, and the central connecting line of the two kidney-shaped holes 215.

The emitter 21 and the receiver 22 are oppositely arranged, the chip holder is clamped between the vertical parts of the L-shaped mounting plates 214 on the two sides of the lens holder, and the vertical parts of the L-shaped mounting plates 214 prevent the chip holder from being displaced. The lead frame 23 has a bent structure between the first end and the second end, the lead frame 23 includes a connection portion and a pin portion, the connection portion is bent to connect the transmitter 21 and the receiver 22, and the pin portion is used for leading out signals. Referring to fig. 2 and 4, the length of the vertical portion of the L-shaped mounting plates 214 on both sides of the lens holder is greater than or equal to the thickness of the chip holder, and is usually equal to the thickness of the chip holder, so that when the chip holder is clamped between the L-shaped mounting plates 214 on both sides, the side of the chip holder where the mounting pins 225 are disposed is flush with the horizontal portion of the L-shaped mounting plates 214. A step structure is formed between the working surface and the non-working surface of at least one base in the lens seat and the chip seat, when the chip seat is clamped between the L-shaped mounting plates 21 on the two sides, the lens seat is abutted against the two non-working surfaces of the chip seat, and the positioning pin 216 on the lens seat is in transition fit with the positioning hole 224 on the chip seat. The two working surfaces of the lens holder and the chip holder are parallel to each other and separated by a predetermined distance H to form a parallel channel with a stable gap, please refer to fig. 5. The light source center of the light source, the lens center of the lens, and the chip center of the photoelectric conversion chip are aligned and perpendicular to the parallel channels.

When the integrated small photoelectric coding module is used, the two mounting positioning pins 225 on the back surface of the chip holder are used for positioning during mounting, the waist-shaped holes 215 are used for fixing and mounting the module, and the central connecting line of the two mounting positioning pins 225 is perpendicular to the central connecting line of the two waist-shaped holes 215, so that the degree of freedom of product mounting is limited. When the integrated small photoelectric coding module is applied, the edge working belt of the moving code disc is arranged in the parallel channel between the lens holder and the chip holder, please refer to fig. 5, wherein the shaded part is the code disc, the gap H of the parallel channel meets the moving space required by the code disc, the gap H is determined by the structures of the two bases, and a stable gap can be formed.

What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.

Claims

1. The integrated small photoelectric coding module is characterized by comprising a transmitter, a receiver and a lead frame; the emitter comprises a lens seat, a lens and a light source, the lens seat comprises a working surface and a non-working surface, the working surface of the lens seat is provided with a lens mounting center, the first end of the lead frame is fixed in the lens seat, the light source is fixedly crystallized on the first end of the lead frame and is positioned at the lens mounting center, and the lens is mounted at the lens mounting center and is tightly attached to the light source; the lens base is provided with L-shaped mounting plate structures on two sides of a non-working surface respectively, the vertical parts of the L-shaped mounting plates on the two sides are perpendicular to the non-working surface of the lens base, the horizontal parts of the L-shaped mounting plates on the two sides are parallel to the non-working surface of the lens base, the horizontal parts of the L-shaped mounting plates on the two sides are arranged in a back-to-back mode and are located on the outer side of the non-working surface of the lens base, and waist-shaped holes are formed in the horizontal parts of the L-shaped; the non-working surface of the lens seat is also provided with a positioning pin;

the first end and the second end of the lead frame are of a bent structure, the emitter and the receiver are arranged in an opposite mode, the chip holder is clamped between the vertical parts of the L-shaped mounting plates on the two sides of the lens holder, a step structure is formed between the working surface and the non-working surface of at least one base in the lens holder and the chip holder, the lens holder is abutted against the two non-working surfaces of the chip holder, the positioning pin on the lens holder is in transition fit with the positioning hole on the chip holder, the lens holder and the two working surfaces of the chip holder are parallel to each other and are separated by a preset distance to form a parallel channel, and the light source center of the light source, the lens center of the lens and the chip center of the photoelectric conversion chip are aligned and perpendicular to the parallel channel; the integrated small photoelectric coding module is arranged in 2 of the photoelectric encoder through waist-shaped holes in L-shaped mounting plates on two sides of the lens seat, and the edge working belt of the motion code disc is arranged in a parallel channel between the lens seat and the chip seat.

2. The integrated small-sized photoelectric coding module according to claim 1, wherein the head of the positioning pin on the lens holder is provided with a chamfer, the aperture of the positioning hole on the chip holder is provided with a bevel chamfer, and the depth of the positioning hole is larger than the length of the positioning pin.

3. The integrated small-sized photoelectric coding module according to claim 1, wherein the chip holder is provided with two raised mounting pins on the other side relative to the chip slot, and the central connecting line of the two mounting pins is perpendicular to the central connecting line of the two kidney-shaped holes.

4. The integrated small-sized photoelectric coding module according to any one of claims 1 to 3, wherein the light source and the lens are embedded in the lens holder, and the lens is lower than the working surface of the lens holder; the photoelectric conversion chip is embedded in the chip seat and is lower than the working surface of the chip seat.