CN101751154A - COB module of optical mouse and optical mouse - Google Patents

Abstract

The invention discloses a COB module of an optical mouse and the optical mouse, wherein the COB module comprises: a modular printed circuit board; a chip containing an inductor circuit, which is welded on the module printed circuit board in a COB structure; a light source element welded on the module printed circuit board; a lens aligned with the chip containing the sensor circuit and the light source element; and a passive component welded on the module printed circuit board; the COB module of the optical mouse and the optical mouse integrate the controller circuit and the optical element of the optical mouse, so that the problem that the optical path of the known optical mouse is easy to deviate is solved, the imaging definition is improved, and by independently arranging a key and a roller mechanism outside the COB module, the design freedom degree of the optical mouse is greatly increased, the design change cost is reduced, and the alignment and correction requirements during manufacturing are also reduced.

Description

COB module of optical mouse and the optical mouse

technical field

The present invention relates to an optical mouse, in particular to a chip-on-board (COB) module of the optical mouse.

Background technique

The optical composition of the optical mouse is shown in Figure 1. In order to facilitate mass production and assembly, its components are produced separately. During assembly, the light source element 12 and the induction chip 14 are welded on the printed circuit board (PCB) 16, and the light source fixing base 10 is fixed on the PCB 16 in a tight fit to prevent the light source element 12 from shaking. The PCB 16 has an opening 162 to allow light to pass through. The lens 18 is placed under the opening 162, and the PCB 16 and the lens 18 are fixed in a combined manner. The lens 18 is placed and combined on the base 19 through the groove 192 and the foolproof structure 194, and the light path is aligned with the light hole 196.

Fig. 2 illustrates the optical path of the optical mouse of Fig. 1, the light source element 12 is generally a red light diode (LED), after the light is emitted from the light source element 12, after being refracted and reflected by the lens 18, it passes through the light transmission hole 196 and is projected to On the plane below the mouse, the reflected light is imaged on the sensor chip 14 through the lens 18 . Due to the different characteristics and roughness of the desktop, the energy intensity of the reflected light is also different, thereby showing the characteristics of the image. When the mouse moves, the sensor chip 14 obtains continuous patterns, and compares and analyzes each image based on the different characteristic positions of the images to determine the direction and displacement of the mouse movement. In other words, the image quality is the main factor affecting the performance of the mouse. Therefore, when the various components in the optical mouse become loose or misplaced, the reflected light from the desktop will not follow the correct optical path and project to the sensor chip 14, and the image captured by the sensor chip 14 will drift or blur, making the image recognition incorrect. .

Distributed optical components have different molds from different manufacturers, resulting in problems such as different heights of the mouse base, poor adhesion between components, and poor fixing effects. This makes the optical mouse very prone to loosening in the vertical direction during operation, resulting in optical paths. offset and out of focus.

In order to reduce the assembly error during production, U.S. Patent No. 6462330 packs the lens into the sensor chip package, U.S. Patent No. 7045775 packs the lens and LED into the sensor chip package, and U.S. Patent No. 7199350 packs the lens, LED and mouse The controller chip is packaged into the package of the sensing chip. Although these existing technologies have a high degree of integration, they are not COB structures and are limited by the pin position of the chip. Once the pin position design is changed, the lead frame of the entire package must be molded again, which is time-consuming and expensive. .

Differently, US Patent Nos. 6,541,762 and 6,653,724 implement the optical mouse in a COB package, in which the sensor chip is soldered on a smaller secondary PCB in the form of a bare crystal, and the secondary PCB is then fixed on the main PCB of the optical mouse. The integration of this optical mouse is not high, and the PCB of the COB needs to be fixed on another PCB, so it is also called a secondary COB.

Contents of the invention

The purpose of the present invention is to provide a COB module for a highly integrated optical mouse. The modular structure makes the position of the optical components absolutely fixed, and the optical components are not easy to loosen or shift, making the optical path more accurate and completely saving Eliminates the time for assembling and correcting optical components during production, effectively improving the production yield.

Another object of the present invention is to provide an optical mouse, in which the mechanism of the man-machine interface is separately designed outside the COB module, so as to increase the degree of freedom in changing the design of the optical mouse.

In order to achieve the above object, the present invention provides a COB module of an optical mouse, including a module printed circuit board, a chip containing a sensor circuit is welded on the printed circuit board in the form of COB, and other passive components and light source components are also Soldered on the printed circuit board, the controller circuit can be integrated on the chip containing the sensor circuit, or prepared on another independent chip soldered on the printed circuit board, the lens forms an optical path so that the light of the light source element can be imaged on the chip containing the sensor circuit.

According to the present invention, an optical mouse includes the above-mentioned COB module fixed on the mouse base, the mouse base has a light-transmitting hole for the light path to pass through, buttons and roller mechanisms are arranged on the mouse base, and the buttons and rollers are connected by cables body with the module printed circuit board.

The invention integrates the optical components and the controller circuit of the optical mouse, thereby improving the degree of freedom of design, improving the definition of imaging, and reducing the cost of manufacturing and changing the design.

Description of drawings

Fig. 1 is the composition schematic diagram of the optical element of existing optical mouse;

Fig. 2 is a cross-sectional view of the existing optical element assembly after completion;

3 is a schematic diagram of a first embodiment of a COB module according to the present invention;

4 is a schematic diagram of an embodiment of an optical mouse according to the present invention;

Fig. 5 is the side view of the second embodiment of the COB module of the present invention;

6 is a side view of a third embodiment of the COB module of the present invention; and

FIG. 7 is a schematic diagram of a fourth embodiment of the COB module of the present invention.

Explanation of main component labels:

10 light source holder

12 light source components

14 sensor chip

16 printed circuit board

162 openings

18 lens

19 base

192 grooves

194 Fool-proof structure

196 light holes

30 COB modules

32 module printed circuit board

36 light blocker

362 openings

364 opening

38 shell

382 tenon

384 cutting groove

40 lens

42 module chip

44 Light source components

46 mouse base

461 Button and wheel mechanism

462 cable

463 light hole

464 module holder

465 studs

48 USB cable

50 COB modules

54 light blocker

542 chimeric structure

544 chimeric structure

60 COB modules

64 light blocker

65 lens

70 COB modules

74 lens

745 light blocking layer

Detailed ways

In the embodiment shown in FIG. 3 , the COB module 30 of the optical mouse includes a module printed circuit board 32 on which circuits are laid. Passive components such as resistors and capacitors are packaged in double-pin packages (DIP) or surface mount components (Surface-Mount Device; SMD; also known as patch components), and are fixed on the mold by plug-in welding or surface mount technology (SMT). set on the printed circuit board 32. For simplicity, details such as passive components and wiring are not shown in FIG. 3 , which are well known to those skilled in the art. The module chip 42 integrating the sensor circuit and the controller circuit is welded on the module printed circuit board 32 in a COB structure, for example, the light source element 44 of the LED is welded on the module printed circuit in the form of a DIP or SMD package by plug-in welding or SMT On the plate 32, the light blocker 36 fixes the position of the lens 40. Preferably, it is made of a non-transparent material, and only two openings 362, 364 are perforated to allow the light of a specific optical path to pass through, which has the effect of isolating stray light The light generated by the light source element 44 passes through the opening 362, is refracted by the lens 40, passes through the cutting groove 384 on the housing 38 and the light transmission hole 463 on the mouse base 46, and is projected on the surface that the mouse base 46 contacts, the lens 40 and then image the diffused or scattered back light onto the module chip 42, and obtain information such as the distance and direction of the mouse movement through its identification. In this embodiment, all the optical components are integrated into a modular structure, so the positions of the optical components are absolutely fixed, the optical path is highly accurate, the imaging is clear, and the time for assembling and correcting the optical components during production is saved. In this embodiment, the module chip 42 is welded on the downward side of the module printed circuit board 32 by COB packaging technology. The COB module 30 allows an optical mouse to only need one module printed circuit board 32 . In other embodiments, the image sensor circuit and the mouse controller circuit can be separated into two separate chips, which are respectively soldered on the module printed circuit board 32 , but the chip containing the sensor circuit must be aligned with the optical path.

The COB framework adopted by the present invention makes the design more flexible. When there are changes such as increase or decrease in the function of the chip pins, it is only necessary to change the circuit design on the module printed circuit board 32 and re-wash the board. It is not necessary to re-open the mold to replace the lead frame design of the package, so the flexibility of the design is increased. Save design change cost.

Fig. 4 is an exploded view of the optical mouse according to the present invention. The button and wheel mechanism 461 is independent of the COB module 30, for example, it is arranged on the mouse base 46, and the key signal and wheel signal generated by operating the button and wheel mechanism 461 are passed through the cable. 462, sent to the input terminal 328 of the module printed circuit board 32, the module chip 42 calculates according to the movement information of the mouse and the signals of the scroll wheel and keys, and finally outputs the mouse control signal to the host through the USB cable 48 connected to the output terminal 326. 3 and 4, in this embodiment, the light blocker 36 is used to fix and maintain the distance and relative relationship between the lens 40, the module chip 42, and the light source element 44, and the housing 38 covers and fixes the light blocker 36 and the lens 40 are fitted into the preset fitting hole 322 on the module printed circuit board 32 with the tenon 382 . In other embodiments, a tenon may also be provided on the light blocker 36 , or other interfitting devices and mechanisms, such as slide rails and screws, may be used to replace the tenon 382 and the interfitting hole 322 . After the COB module 30 is assembled, the screw 50 is used to lock the stud 465 on the mouse base 46 , and the module seat 464 is fixed on the mouse base 46 .

The existing optical mouse only integrates optical components, and the mouse controller is still realized by soldering an independent chip and passive components on the main printed circuit board. Once you want to adjust the appearance of the mouse and change the position of the scroll wheel and buttons, you must re-wash the board and change the circuit on the main printed circuit board. You must also coordinate the position of the buttons, the position of the scroll wheel, and the precise alignment of the optical path during assembly. In order to make the optical mouse work correctly. In the optical mouse of this embodiment, since the lens 40 and the mouse controller are integrated in the COB module 30, and the button and the wheel mechanism 461 are independently arranged on the mouse base 46, the mouse designer can freely adjust the relationship between the button and the wheel mechanism 461 and the light transmission. The relative relationship between the holes 463 can also freely change the shape and size of the mouse base 46, as long as the light path of the COB module 30 can pass through the light-transmitting holes 463, the degree of freedom for changing the design is high, and the alignment requirement is low. After the COB module proposed by the present invention is connected to the PC cable and the button and wheel signals, it has a complete optical mouse function, and the actual production saves manpower and man-hours compared with the previous processes.

5 is a side view of the second embodiment of the COB module of the present invention, the module chip 42 and the light source element 44 are welded to the module printed circuit board 32, and the light blocker 54 has the functions of light blocking and protecting the lens 55 concurrently. There are fitting structures 542 and 544 for the fitting of the lens 40 to form the COB module 50. The light provided by the light source element 44 passes through the light blocker 54, and is reflected by the lens 40 through the light transmission hole of the mouse base 46 for diffusion or scattering. The returned light passes through the lens 40 and is imaged on the module chip 52 . In this embodiment, the light blocker 54 is equivalent to integrating the light blocker 36 and the housing 38 of the embodiment shown in FIG. 3 , thus reducing components.

Fig. 6 is the side view of the third embodiment of the COB module of the present invention, the lens 65 in the COB module 60 fits the module printed circuit board 32 and fixes the light blocker 64, and the two openings of the light blocker 64 are opposite to each other respectively. The module chip 42 and the light source element 44 are soldered to the module printed circuit board 32 for the light emitted by the light source element 44 to pass through. In this embodiment, the lens 65 is equivalent to integrating the lens 40 and the housing 38 of the embodiment shown in FIG. 3 , thus reducing components.

7 is a schematic diagram of the fourth embodiment of the COB module of the present invention, the module chip 42 and the light source element 44 are welded to the module printed circuit board 32, and the lens 74 is embedded in the module printed circuit board 32 to form a COB module 70. The part of the lens 74 adjacent to the module chip 42 is coated with a light-blocking layer 745, which is used to replace the function of the light-blocking device in the foregoing embodiments. The diffused or scattered light passes through the lens 74 and is imaged on the module chip 42 through the light hole. In this embodiment, not only the lens 74 is equivalent to integrating the lens 40 and the housing 38 of the embodiment in FIG. 3 , but also the independent light blocker 36 is reduced. In other embodiments, a light-blocking layer may also be coated on the surface of the lens 74 adjacent to the light source element 44 to adjust the light emitting direction of the light source element 44 .

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (20)

1. the COB module of an optical mouse is characterized in that, described COB module comprises:

The module printed circuit board (PCB);

The chip that contains inductor circuit is welded in this module printed circuit board (PCB) with the COB structure;

Light source component is welded in this module printed circuit board (PCB);

Lens are aimed at this chip that contains inductor circuit and this light source component; And

Passive device is welded on this module printed circuit board (PCB);

Wherein, controller circuitry is incorporated on this chip that contains inductor circuit, or is welded on the chip of this module printed circuit board (PCB) at another.

2. COB module according to claim 1 is characterized in that this light source component comprises LED.

3. COB module according to claim 1 is characterized in that, also comprises lighttight light trap, and it has two openings and aims at this chip that contains inductor circuit and this light source component respectively.

4. COB module according to claim 3 is characterized in that these lens are entrenched in this light trap.

5. COB module according to claim 3 is characterized in that, these lens are entrenched on this module printed circuit board (PCB).

6. COB module according to claim 1 is characterized in that, comprises that also housing covers this lens, and has cutting groove and pass through by light.

7. COB module according to claim 1 is characterized in that, this contains on the chip of inductor circuit and the same one side that this light source component is welded in this module printed circuit board (PCB).

8. COB module according to claim 1 is characterized in that, contiguous this chip place of containing inductor circuit of these lens is coated with shading layer.

9. COB module according to claim 1 is characterized in that, this module printed circuit board (PCB) comprises that also an output terminal provides this a COB module and an external host communication.

10. COB module according to claim 1 is characterized in that, this module printed circuit board (PCB) comprises that also an input end is for the push button signalling or the roller signal that receive this optical mouse.

11. an optical mouse is characterized in that, described optical mouse comprises:

The mouse base has light hole;

Button and idler wheel mechanism are on this mouse base;

The COB module, on this mouse base, this COB module comprises:

The module printed circuit board (PCB);

The chip that contains inductor circuit is welded in this module printed circuit board (PCB) with the COB structure;

Light source component is welded in this module printed circuit board (PCB);

Lens are aimed at this chip that contains inductor circuit and this light source component; And

Passive device is welded on this module printed circuit board (PCB);

Wherein, controller circuitry is incorporated on this chip that contains inductor circuit, or is welded on the chip of this module printed circuit board (PCB) at another; And

Winding displacement connects this button and idler wheel mechanism and this module printed circuit board (PCB).

12. optical mouse according to claim 11 is characterized in that, comprises that also chimeric mechanism is fixed on this COB module on this mouse base.

13. optical mouse according to claim 11 is characterized in that, this module printed circuit board (PCB) has output terminal, for output mouse control signal.

14. optical mouse according to claim 11 is characterized in that, this light source component comprises LED.

15. optical mouse according to claim 11 is characterized in that, also comprises lighttight light trap, it has two openings and aims at this chip that contains inductor circuit and this light source component respectively.

16. optical mouse according to claim 15 is characterized in that, these lens are entrenched in this light trap.

17. optical mouse according to claim 15 is characterized in that, these lens are entrenched on this module printed circuit board (PCB).

18. optical mouse according to claim 11 is characterized in that, comprises that also housing covers this lens, and has cutting groove and pass through by light.

19. optical mouse according to claim 11 is characterized in that, this contains on the chip of inductor circuit and the same one side that this light source component is welded in this module printed circuit board (PCB).

20. optical mouse according to claim 11 is characterized in that, contiguous this chip place of containing inductor circuit of these lens is coated with shading layer.

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