CN201732162U - Optical navigation device and sensor cover plate thereof - Google Patents

Abstract

The utility model provides an optical navigation device and a sensor cover thereof. The optical navigation device includes an outer casing, a sensor arranged in the outer casing, a sensor cover arranged in the outer casing, and covers the above-mentioned sensor. The sensor cover A diaphragm hole is opened on the plate, and the sensor cover plate has a boss extending toward the sensor direction. It can solve the problem in the prior art that the stray light from the light source goes out to the sensor and cause misoperation, and the optical navigation device works reliably.

Description

An optical navigation device and its sensor cover plate

【Technical field】

The utility model relates to an optical navigation device, in particular to a sensor cover plate of the optical navigation device. the

【Background technique】

Due to its ease of use, optical navigation devices gradually occupy an important position in modern life. They illuminate the surface of objects on the workbench through light sources, and transmit the reflected light to the sensor, so as to feel the movement of objects and achieve the purpose of convenient control. the

The optical navigation device of the prior art is shown in Figure 1, and the optical navigation device 1 comprises a housing 11, and a light source 15 and a lens 12 are arranged inside the housing 11, and a supporting body 111 is molded on the housing 11, covered with The sensor cover 13 forms a receiving space 17 between the sensor cover 13 and the supporting body 111 , and the sensor 14 is disposed in the receiving space 17 . An aperture hole 131 is opened on the sensor cover plate 13 , and the aperture hole 131 extends downward with a certain thickness and expands into a bell mouth 132 . The light emitted by the light source 15 is projected toward the working surface 19 after being refracted and reflected by the lens 12 . The object (not shown) on the working surface 19 reflects the light again, and then passes through the lens 12 and enters the aperture 131 disposed below the lens 12 , so as to project on the sensor 14 . The optical navigation device 1 in the prior art can conveniently detect the motion of the object on the working surface 19, so as to perform the optical navigation action. the

However, there are certain problems in the arrangement of existing optical navigation devices. Firstly, the lower surface of the sensor cover 13 is flat and covers the supporting body 111 . Because in the connection of mechanical structures, it is impossible to achieve complete closeness, so that some stray light will enter the receiving space 17, resulting in misoperation of the optical navigation device. the

In addition, during the manufacturing process of the sensor cover plate 13, since the diameter of the aperture hole 131 is small and its thickness is small, the aperture hole 131 is impacted by the liquid flow during the molding process, which often causes the aperture to be out of round. , In the case of deformation, the effect of passing light may not reach the expected amount, so the efficiency of the sensor is not high. the

【Content of utility model】

The purpose of this utility model is to provide an optical navigation device and its sensor cover, which can effectively prevent the stray light emitted by the light source from escaping into the storage space of the sensor, causing false detection by the sensor. the

Another object of the present utility model is to provide an optical navigation device and its sensor cover, which can make the diaphragm hole on the sensor cover more round without deformation, so that the efficiency of the sensor is higher. the

In order to achieve the above object, an optical navigation device of the present utility model includes an outer casing, a sensor arranged in the outer casing, a sensor cover is arranged in the outer casing, and covers the above-mentioned sensor, the sensor cover is provided with There is an aperture hole, wherein the sensor cover has a boss extending toward the sensor. the

The utility model also has the following features: the aperture hole of the sensor cover plate has a bell mouth opening downward, and the width of the boss is close to the diameter of the bell mouth; in addition, the optical navigation device also includes a light source , the boss is located between the aperture hole on the sensor cover plate and the light source, and the boss is located on the injection molding path between the aperture hole and the sensor cover plate and is close to the aperture hole. the

In order to achieve the above purpose, the utility model can also be achieved in the following manner: a sensor cover plate of an optical navigation device, on which an aperture hole is arranged, and a boss extending downward is provided on one side of the aperture hole. the

Through the above arrangement, a boss is provided downward on one side of the diaphragm hole, which can prevent the stray light from the light source from escaping into the accommodation space of the sensor, thereby causing malfunction of the sensor. In addition, the setting of the boss makes the aperture hole more round when forming, so that the situation of light transmission is more predictable, and the sensor efficiency is higher. the

【Description of drawings】

FIG. 1 is a schematic structural diagram of an existing optical navigation device, which is used to illustrate the positional relationship between the optical navigation device and its sensor cover. the

FIG. 2 is a schematic diagram of the overall structure of the optical navigation device implementing the present invention, which is used to show the positional relationship between the optical navigation device and its sensor cover. the

FIG. 3 is a three-dimensional schematic diagram of the sensor cover of the optical navigation device according to the present invention, showing the position of the boss on the sensor cover. the

Detailed ways

The technical content of the present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments. the

Please refer to FIG. 2 , which is a schematic structural diagram of the optical navigation device 2 of the present invention. The optical navigation device 2 includes a housing 21, a support body 211 is integrally formed in the housing 21, an empty space 29 is formed between the support body 211 and the housing 21, a sensor 22 is arranged in the accommodation space 29, and a sensor The cover plate 28 covers the receiving space 29 , and one end thereof is supported by the supporting body 211 , so that the receiving space 29 basically forms a closed space. On the sensor cover plate 28, an aperture hole 281 is opened. After the aperture hole 281 extends downwards to a certain thickness, a bell mouth 283 is formed downward. In the design of the optical navigation device 2, the diameter of the general bell mouth 283 is equivalent. The size of the photosensitive area of the chip in the sensor 22. In the housing 21, a light source 25 is arranged outside the housing space 29. The light emitted by the light source 25 is refracted and reflected by the lens 27, and then projects the light onto the working surface 23. Under the reflection of the working surface 23, the light again It enters the housing 21 , is refracted by the lens 27 , enters the accommodating space 29 through the aperture 281 , and forms an image of the object on the working surface 23 through the sensor 22 for effective operation. the

Please refer to FIG. 3 at the same time. On the cover plate 28, a boss 288 extends toward the sensor 22. The boss 288 is located between the aforementioned bell mouth 283 and the light source 25, and is located between the aforementioned support body 211 and the aperture hole 281. between. The boss 288 is configured as a cuboid, and its length is roughly equivalent to the diameter of the bell mouth 283 . the

Therefore, when in use, even if the combination of the support body 211 and the sensor cover plate 28 is not so sealed, the stray light that occasionally escapes into the receiving space 29 will be blocked by the boss 288, blocking the photosensitive area of the chip of the sensor 22 , so as not to interfere with the sensor 22 and cause misoperation of the optical navigation device 2 . the

In addition, when manufacturing the sensor cover plate 28 of the optical navigation device 2 of the present utility model, it is integrally injection molded, so that the position of the aforementioned boss 288 is between the injection port of the injection molding equipment and the aperture hole 281 and close to the aperture hole 281 , in order to improve the molding quality of the aperture 281, and make the aperture 281 more circular in shape, so that the light quantity of the receiving space 29 can be controlled during use, and its efficiency will increase. the

Claims (9)

1. optical navigator, include shell body, be arranged at the sensor in the shell body, one sensor cover plate is arranged in the shell body, and be covered on the sensor, offer aperture on the described sensor cover plate, it is characterized in that: have to the extended boss of sensor orientation at described sensor cover plate.

2. optical navigator as claimed in claim 1 is characterized in that: the described aperture of described sensor cover plate has the hydraucone under shed.

3. optical navigator as claimed in claim 2 is characterized in that: the width of described boss is near bell-mouthed diameter.

4. optical navigator as claimed in claim 1 is characterized in that: described optical navigator also includes light source, and described boss is between sensor cover plate glazing door screen hole and the light source.

5. optical navigator as claimed in claim 1 is characterized in that: described cover plate is injection mo(u)lding, and described boss is in aperture and described sender unit cap plate injection moulding and advances on the glue path and near near the aperture.

6. the sensor cover plate of an optical navigator, it is provided with aperture, it is characterized in that: be provided with in aperture one side and extend boss downwards.

7. optical navigator as claimed in claim 6 is characterized in that: the described aperture of described sensor cover plate has the hydraucone under shed.

8. optical navigator as claimed in claim 7 is characterized in that: the width of described boss is near bell-mouthed diameter.

9. optical navigator as claimed in claim 6 is characterized in that: described cover plate is injection mo(u)lding, and described boss is in aperture and described sender unit cap plate injection moulding and advances on the glue path and near near the aperture.

Images