Optical gesture sensor packaging structure
By utilizing the optical gesture sensor packaging structure and the design of light shields and lenses, the problems of high cost and large PCB area of existing optical gesture sensors are solved, realizing miniaturized and low-power optical gesture recognition, which is suitable for widespread application.
Patent Information
- Application Number
- CN202520072328.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing optical gesture sensor packaging methods suffer from high costs, large PCB areas, and difficulty in widespread application. In particular, camera-based methods are too expensive, a single sensor cannot recognize multi-directional gestures, and multiple sensors increase the number of components and the PCB area.
The optical gesture sensor packaging structure includes a base plate, an optical motion trajectory recognition chip, and an optical emitting LED chip. It is equipped with a light shield and a lens, and uses light guide holes in the emitting cavity and receiving cavity to achieve light transmission, reduce external ambient light interference, reduce power consumption, and recognize gestures from a distance.
It achieves optical gesture navigation, has a small package size, saves PCB board area, is easy to install, reduces hardware costs and power consumption, and is suitable for widespread application.
Smart Images
Figure CN223798589U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of semiconductor packaging technology, specifically to an optical gesture sensor packaging structure. Background Technology
[0002] With the continuous advancement of human technology, more and more new products are being developed, most of which bring convenience and improve people's quality of life. A large portion of these products serve as tools, and the use of tools requires human operation. Common operating media include buttons, mice, and joysticks; all of these require manual contact. Non-contact operating products are still relatively rare; optical sensors are more commonly used.
[0003] Optical sensors use photodiodes to convert light signals into electrical signals. They convert these signals into different voltage signals based on varying light intensities, and then convert them into digital signals via analog-to-digital conversion, facilitating signal processing. Since we primarily operate tools or equipment by hand, optical sensors need to accurately recognize human gestures.
[0004] The most common gesture operations currently include:
[0005] In the camera-based method, a person makes various hand gestures in front of the camera, the camera captures the images, and the data is sent to the host computer for processing and recognition. Based on the gesture definition, it is then converted into the required commands to control tools or devices. In order to quickly recognize the operation gestures, the host computer needs to have powerful computing capabilities, making such a system very expensive and preventing its widespread application.
[0006] The single-sensor method (one LED + one photodiode) involves an MCU controlling the LED to emit light and then collecting the photovoltage signal from the photodiode. If the emitted light is detected, it indicates the presence of an obstruction above; otherwise, it does not. However, this detection method can only detect the presence of an obstruction above. With multiple consecutive samples, it can also detect whether the obstruction is approaching or moving away. But it cannot detect other directions of hand gesture movement.
[0007] A multi-sensor approach (multiple LEDs + multiple photodiodes), such as four LEDs + four photodiodes, is used, each controlled by a separate MCU. The sensing signals from each sensor are sent to the host computer for processing. Each sensor group can detect obstructions, and the results are promptly sent to the host computer. The host computer calculates the object's direction of movement based on the sequence of the sensing signals, thus achieving gesture recognition. However, to effectively recognize the gesture direction, the sensors must be spaced further apart, and interference between them must be prevented. This increases the PCB area and hardware manufacturing costs.
[0008] In summary, camera-based sensors are too expensive and not convenient for widespread application; single-sensor sensors cannot recognize multi-directional gestures; and multi-sensor sensors require more components and significantly increase PCB area. Therefore, a new sensor packaging method is needed that reduces both the number of components and the PCB area to facilitate widespread market adoption. Utility Model Content
[0009] To address the shortcomings of existing technologies, this invention provides an optical gesture sensor packaging structure. This structure can realize optical gesture navigation function, while having a small package size, which greatly saves the area of the application PCB board.
[0010] An optical gesture sensor packaging structure includes a base plate on which an optical motion trajectory recognition chip and an optical emitting LED chip are mounted. A light shield is mounted on the base plate, and the light shield has an emitting cavity and a receiving cavity. The optical emitting LED chip is installed in the emitting cavity, and the optical motion trajectory recognition chip is installed in the receiving cavity. A light guide hole is formed on the top wall of the emitting cavity, and a light guide hole is formed on the top wall of the receiving cavity. The light emitted by the optical emitting LED chip can be reflected by the hand through the light guide hole and then through the light guide hole to the optical motion trajectory recognition chip.
[0011] Preferably, both the optical motion trajectory recognition chip and the optical emitting LED chip have lenses on top.
[0012] Preferably, the lens is an epoxy resin lens.
[0013] Preferably, a colloid seat is provided in both the transmitting cavity and the receiving cavity. The colloid seat is made of a transparent material, and the optical motion trajectory recognition chip and the optical emitting LED chip are respectively located in the two colloid seats.
[0014] Preferably, the lens is fixed on a colloid mount.
[0015] Preferably, the base plate has a plurality of pads, each colloid holder has a pad, and the optical motion trajectory recognition chip and the optical emitting LED chip are connected to the corresponding pads via electrical connection lines.
[0016] Preferably, the optical motion trajectory recognition chip and the optical emitting LED chip are die-bonded on the substrate.
[0017] Preferably, the bottom wall of the base plate has a plurality of pins.
[0018] The beneficial effects of this utility model are reflected in:
[0019] In this technical solution, an optical motion trajectory recognition chip and an optical emitting LED chip are set on the base plate, and a light shield is set to prevent external ambient light from interfering with the optical motion trajectory recognition chip. In actual use, the hand is placed above the device, and the light emitted by the optical emitting LED chip is reflected by the hand through the light guide hole of the emission cavity and then through the light guide hole of the receiving cavity to the optical motion trajectory recognition chip, realizing the optical gesture navigation function. At the same time, the package size is small, which greatly saves the area of the PCB board, and the installation is simple and the processing is convenient.
[0020] In this technical solution, a lens is placed above the optical emitting LED chip, which can effectively emit light from the light guide hole of the emitting cavity. A lens is placed on the optical motion trajectory recognition chip, which can greatly receive the light transmitted from the light guide hole of the receiving cavity, thereby enabling the sensor to recognize gestures from a greater distance and reduce the power consumption of the sensor.
[0021] In this technical solution, the lens is made of epoxy resin, which can transmit only specific wavelengths emitted by the optical emitting LED chip, thereby greatly reducing interference from external ambient light. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0023] Figure 1 This is a side sectional view of the present invention.
[0024] In the attached diagram, 1-base plate, 2-optical motion trajectory recognition chip, 3-optical emitting LED chip, 4-light shield, 5-emitting cavity, 6-receiving cavity, 7-light guide hole of emitting cavity, 8-light guide hole of receiving cavity, 9-lens, 10-colloidal seat, 11-soldering pad, 12-electrical connection line, 13-pin. Detailed Implementation
[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0027] Example 1
[0028] like Figure 1As shown, this embodiment provides an optical gesture sensor packaging structure, including a base plate 1. An optical motion trajectory recognition chip 2 and an optical emitting LED chip 3 are mounted on the base plate 1. A light shield 4 is mounted on the base plate 1. The light shield 4 has an emitting cavity 5 and a receiving cavity 6. The optical emitting LED chip 3 is installed in the emitting cavity 5, and the optical motion trajectory recognition chip 2 is installed in the receiving cavity 6. The top wall of the emitting cavity 5 has an emitting cavity light guide hole 7, and the top wall of the receiving cavity 6 has a receiving cavity light guide hole 8. The light emitted by the optical emitting LED chip 3 can be reflected by the hand through the emitting cavity light guide hole 7 and then through the receiving cavity light guide hole 8 to the optical motion trajectory recognition chip 2.
[0029] In this embodiment, an optical motion trajectory recognition chip 2 and an optical emitting LED chip 3 are set on the base plate 1, and a light shield 4 is set to prevent external ambient light from interfering with the optical motion trajectory recognition chip 2. In actual use, when the hand is placed above the device, the light emitted by the optical emitting LED chip 3 is reflected by the hand through the light guide hole 7 of the emission cavity and then through the light guide hole 8 of the receiving cavity to the optical motion trajectory recognition chip 2. In this way, the optical gesture navigation function is realized. At the same time, the package size is small, which greatly saves the area of the PCB board. It is simple to install and easy to process.
[0030] In this embodiment, the optical motion trajectory recognition chip 2 is a chip that can capture various motion trajectories and output the results digitally.
[0031] In this embodiment, both the optical motion trajectory recognition chip 2 and the optical emitting LED chip 3 are equipped with lenses 9. In this embodiment, the lens 9 is an epoxy resin lens.
[0032] In this embodiment, a lens 9 is disposed above the optical emitting LED chip 3, which can effectively emit light from the light guide hole 7 of the emitting cavity. The lens 9 is disposed on the optical motion trajectory recognition chip 2, which can greatly receive the light transmitted from the light guide hole 8 of the receiving cavity, thereby enabling the sensor to recognize gestures from a greater distance and reducing the power consumption of the sensor. The lens 9 is made of epoxy resin lens, which can only transmit specific wavelengths emitted by the optical emitting LED chip 3, thereby greatly reducing the interference of external ambient light.
[0033] In this embodiment, both the transmitting cavity 5 and the receiving cavity 6 are provided with a colloid seat 10. The colloid seat 10 is made of transparent material, and the optical motion trajectory recognition chip 2 and the optical emitting LED chip 3 are respectively located in the two colloid seats 10.
[0034] In this embodiment, the lens 9 is fixed on the colloid seat 10.
[0035] In this embodiment, the base plate 1 has a plurality of pads 11, and each colloid holder 10 has a pad 11. The optical motion trajectory recognition chip 2 and the optical emitting LED chip 3 are connected to the corresponding pads 11 via electrical connection lines 12. In this embodiment, the connection between the optical motion trajectory recognition chip 2 and the optical emitting LED chip 3 and the base plate 1 is achieved through the connection between the electrical connection lines 12 and the pads 11.
[0036] In this embodiment, a colloid holder 10 is provided to mount the lens 9. Simultaneously, the colloid holder 10 protects the internal chip and electrical connection lines 12.
[0037] In this embodiment, the optical motion trajectory recognition chip 2 and the optical emitting LED chip 3 are die-bonded on the base plate 1.
[0038] The bottom wall of the base plate 1 in this embodiment has a plurality of pins 13. The pins 13 on the bottom wall of the base plate 1 in this embodiment are used for electrical connection with the PCB board.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. An optical gesture sensor packaging structure, characterized in that, The device includes a base plate (1), on which an optical motion trajectory recognition chip (2) and an optical emitting LED chip (3) are mounted. A light shield (4) is mounted on the base plate (1). The light shield (4) has an emitting cavity (5) and a receiving cavity (6). The optical emitting LED chip (3) is installed in the emitting cavity (5), and the optical motion trajectory recognition chip (2) is installed in the receiving cavity (6). The top wall of the emitting cavity (5) has an emitting cavity light guide hole (7), and the top wall of the receiving cavity (6) has a receiving cavity light guide hole (8). The light emitted by the optical emitting LED chip (3) can be reflected by the hand through the emitting cavity light guide hole (7) and then through the receiving cavity light guide hole (8) to the optical motion trajectory recognition chip (2).
2. The optical gesture sensor packaging structure according to claim 1, characterized in that, Both the optical motion trajectory recognition chip (2) and the optical emitting LED chip (3) have lenses (9) above them.
3. The optical gesture sensor packaging structure according to claim 2, characterized in that, The lens (9) is an epoxy resin lens.
4. The optical gesture sensor packaging structure according to claim 2, characterized in that, Both the transmitting cavity (5) and the receiving cavity (6) are provided with a colloid seat (10), which is made of transparent material. The optical motion trajectory recognition chip (2) and the optical emitting LED chip (3) are located in the two colloid seats (10) respectively.
5. The optical gesture sensor packaging structure according to claim 4, characterized in that, The lens (9) is fixed on the colloid seat (10).
6. The optical gesture sensor packaging structure according to claim 4, characterized in that, The base plate (1) has several pads (11), and each colloid seat (10) has a pad (11). The optical motion trajectory recognition chip (2) and the optical emitting LED chip (3) are connected to the corresponding pads (11) through electrical connection lines (12).
7. The optical gesture sensor packaging structure according to claim 1, characterized in that, The optical motion trajectory recognition chip (2) and the optical emitting LED chip (3) are die-bonded on the base plate (1).
8. The optical gesture sensor packaging structure according to claim 1, characterized in that, The bottom wall of the base plate (1) has a number of pins (13).