TWI468996B - Optical dustproof mouse - Google Patents

Description

Optical dustproof mouse

The invention relates to a mouse, in particular to an optical dustproof mouse with a dustproof sheet.

The optical mouse is a very important tool for personal computers to control the input signal to the computer. The optical mouse is placed on a surface and the image of the surface is captured by the internal light sensing module, which is caused by the movement of the mouse. Capture the change of the image, and make the cursor on the display screen a related movement. The sensitivity and accuracy of the cursor on the display screen depends on whether the light sensing module can accurately capture the image of the surface.

There is no obstruction between the light-sensing module at the bottom of the optical mouse and the surface. Therefore, as the optical mouse uses more time, the light-sensing module is liable to adhere to impurities such as dust, causing the light-sensing module to capture. There is an error in the surface image, which reduces the sensitivity and accuracy of the cursor on the display screen.

The reason is that the present inventors have felt that the above-mentioned defects can be improved, and the present invention has been put forward with great interest and research, and finally proposes a present invention which is reasonable in design and effective in improving the above-mentioned defects.

The main purpose of the present invention is to provide an optical dustproof mouse which can improve the adhesion of dust on the light sensing module, cause errors in the surface image captured by the light sensing module, and reduce the sensitivity and accuracy of the cursor on the display screen. problem.

In order to achieve the above object, the present invention provides an optical dustproof mouse comprising: a mouse body having an accommodating space therein, the accommodating space having a accommodating space running through the accommodating space a light-sensing module is disposed in the accommodating space, the light-sensing module has a light emitter, an optical mirror, and a light receiver, the light emitter facing the optical mirror The optical receiver faces the through hole, the optical lens group is located between the light emitter and the light receiver; and a dustproof sheet is disposed at the through hole, the dustproof piece has a transparent panel and a first A coating layer is disposed on a side of the transparent panel.

The invention has the following beneficial effects:

The invention provides a dustproof sheet between the light sensing module and the outer side of the mouse body, so as to prevent dust and other impurities from adhering to the light sensing module, causing errors in the surface sensing image of the light sensing module, and reducing the display screen. The sensitivity and accuracy of the cursor.

Referring to FIG. 1 to FIG. 3 , the present invention provides an optical dustproof mouse comprising a mouse body 1, a light sensing module 2 and a dustproof sheet 3.

The accommodating body 1 has a receiving space 11 therein. The accommodating space 11 has a through hole 12 extending from the accommodating space 11 to the outside of the mouse body 1. The mouse body 1 has a plurality of foot pads 13 below. The through hole 12 includes a recessed joint portion 121, and the dustproof sheet 3 is fixed to the joint portion 121. The foot pad 13 raises the height of the mouse to prevent the dust-proof piece 3 or other components under the mouse from rubbing against the moving surface of the mouse, causing wear of many components.

The light sensing module 2 is disposed in the accommodating space 11 . The light sensing module 2 has a light emitter 21, an optical mirror 22 and a light receiver 23. The light emitter 21 faces the optical lens group 22, and the light receiver 23 faces the through hole 12 of the mouse body 1. The optical lens group 22 is located between the light emitter 21 and the light receiver 23. In this embodiment, the light emitter 21 is an LED, but is not limited, and different types of light emitters 21, such as lasers, may be selected, and the emitted light source preferably has a wavelength range of 400 to 700 nm. The wavelength range of visible light.

Referring to FIGS. 1 and 4, the dustproof sheet 3 is disposed at the through hole 12 of the mouse body 1. The dustproof sheet 3 has a transparent panel 31, a first plating layer 32, a second plating layer 33, and a printing portion 34. The first coating layer 32 is disposed on one side of the transparent panel 31, the printing portion 34 is disposed on the outer periphery of the first coating layer 32, the printing portion 34 has an aesthetic effect, and the printing portion 34 is coated with a bonding portion of the adhesive connecting the through holes 12. 121, and the dustproof sheet 3 is adhered to the mouse body 1. In this embodiment, the transparent panel 31 is an acrylic panel, but without limitation, a panel with different high light transmittance materials, such as a glass panel, may be selected. The purpose of the dust-proof sheet 3 is to increase the light transmittance of the dust-proof sheet 3. Therefore, if the light transmittance is further increased, a second coating layer may be further coated on the side of the transparent panel 31 away from the first coating layer 32. 33. The refractive indices of the first plating layer 32 and the second plating layer 33 are smaller than the refractive index of the transparent panel 31. In this embodiment, the material of the first plating layer 32 and the second plating layer 33 is ceria, titania or magnesium difluoride.

The optical mouse first emits light to the optical lens group 22 by the light emitter 21 of the light sensing module 2 when sensing the movement of the mouse, and leaves the optical lens group 22 after multiple reflections and refractions in the optical lens group 22. Then, after passing through the dustproof sheet 3 to reach the moving surface of the mouse, it is reflected back, passes through the dustproof sheet 3 again, and enters the light receiver 23. Thereby, the light sensing module 2 can capture the image of the moving surface of the mouse, and then determine the movement of the mouse by the movement of the captured image caused by the movement of the mouse.

When light enters from one medium to another, there is partial reflection and partial penetration at the interface. For acrylic panels, when light enters the acrylic panel from air, 4% of the light is reflected, 96% of the light is transmitted, and when the reflected light is too much, some harmful stray light is formed. This in turn affects the capture of the image by the light receiver 23.

When light passes through a transparent substance, if there are tiny particles in the material, the photons will be dispersed in all directions. This phenomenon is called scattering image, and the occurrence of scattering images will cause photon loss and mutual interference, and thus affect the image. The light receiver 23 captures the image.

When the light passes through the dustproof sheet 3 twice, there are four reflections on the upper and lower surfaces of the dustproof sheet 3, and the two passes through the dustproof sheet 3 to cause consumption, which causes the light transmittance to be too low and the reflectance to be too high. The accuracy of the image pickup by the light receiver 23 is reduced.

In order to increase the penetration rate of the dustproof sheet 3, the surface of the dustproof sheet 3 of the present invention has a coating layer. According to the basic theory of electromagnetics, the calculation formulas of the transmittance and reflectivity of different media are: (normal incidence from the medium n1 to n2) )

Transmission rate = 1 - reflectivity

Generally, the material coated by the optical coating is MgF ₂ with refractive index = 1.35; the refractive index of air = 1.0; the refractive index of acrylic = 1.5, which can be obtained by substituting the above formula:

1. Light enters acrylic by air

Reflectance = 4%

Penetration rate = 96%

2. Light enters the coating layer from the air and then enters the acrylic

Reflectance = 0.3%

Penetration rate = 99.7%

As can be seen from the above, the dustproof sheet 3 having the coating layer can greatly increase the transmittance thereof and reduce the influence of the reflected stray light on the image pickup of the light receiver 23.

In addition, the thickness of the coating layer can be designed such that the phase difference of the reflected light generated when the light passes through the upper and lower surfaces of the coating layer is 1/2 wavelength (ie, reversed phase), causing destructive interference between the two reflected lights, thereby The reflected light is cancelled to achieve the effect of anti-reflection.

The coating layer is mainly made by physical evaporation method, and the method is to convert the coating material from a solid state into a gaseous or ionic state, a gaseous or ionic material, and the evaporation source passes through the space to reach the surface of the transparent panel 31, and is deposited and gradually formed. Coating layer. In addition, in order to make the coating layer have high purity, the coating process is completed under high vacuum (10 ^-5 torr) environment.

The dustproof sheet 3 of the present invention is fixed to the mouse body 1 by adhesive means from the outside. When the dustproof sheet 3 encounters problems such as scratches or dirt, the dustproof sheet 3 can be removed and replaced, so that the dustproof sheet 3 can be optimally maintained. The effect of light penetration.

The dust-proof sheet 3 is disposed between the light-sensing module 2 and the outside of the mouse body 1 to prevent dust and the like from adhering to the light-sensing module 2, and the light-sensing module 2 has an error in capturing the surface image. Reduce the sensitivity and accuracy of the cursor on the display.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the equivalent changes and modifications made by the scope of the present invention are covered by the scope of the present invention. .

1. . . Mouse body

11. . . Housing space

12. . . Through hole

121. . . combination

13. . . Foot pad

2. . . Light sensor module

twenty one. . . Light emitter

twenty two. . . Optical mirror

twenty three. . . Optical receiver

3. . . Dust sheet

31. . . Transparent panel

32. . . First coating

33. . . Second coating

34. . . Printing department

Figure 1 is a perspective exploded view of the optical dustproof mouse of the present invention.

2 is a perspective view of the optical dustproof mouse of the present invention.

3 is a cross-sectional view of the optical sensing module of the optical dustproof mouse of the present invention.

4 is a cross-sectional view of the dustproof sheet of the optical dustproof mouse of the present invention.

1. . . Mouse body

12. . . Through hole

121. . . combination

13. . . Foot pad

twenty three. . . Optical receiver

3. . . Dust sheet

Claims (7)

An optical dustproof mouse includes: a mouse body having an accommodating space therein, and a through hole extending from the accommodating space to the outside of the mouse body; a module, disposed in the accommodating space, the light sensing module has a light emitter, an optical mirror, and a light receiver, the light emitter facing the optical mirror, the light receiver facing the through a hole, the optical lens group is located between the light emitter and the light receiver; and a dustproof sheet disposed at the through hole, the dustproof sheet has a transparent panel and a first coating layer, the first coating layer And disposed on a side of the transparent panel, the dustproof sheet further includes a second coating layer disposed on the side of the transparent panel away from the first coating layer, and the first coating layer and the second coating layer The refractive index of the layer is smaller than the refractive index of the transparent panel, and the thickness of the first coating layer is different from the thickness of the second coating layer, and the reflected light passing through the first coating layer passes through the second coating layer The reflected light has a phase difference of one-half. The optical dustproof mouse of claim 1, wherein the transparent panel is a glass panel or an acrylic panel. The optical dustproof mouse of claim 1, wherein the through hole of the mouse body comprises a concave joint, and the dustproof sheet is disposed at the joint. The optical dustproof mouse of claim 1, wherein the light emitter is an LED. The optical dust-proof mouse of claim 1, wherein the light emitter emits light having a wavelength of 400 to 700 nm. The optical dustproof mouse according to claim 5, wherein the first coating layer and the second coating layer are made of ceria, titania or magnesium difluoride. The optical dustproof mouse according to claim 1, wherein the outer periphery of the first coating layer further has a printing portion, and the printing portion is connected to the joint portion of the through hole.