CN2560031Y

CN2560031Y - Improved optical mouse

Info

Publication number: CN2560031Y
Application number: CN02240664U
Authority: CN
Inventors: 陈淑芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-25
Filing date: 2002-06-25
Publication date: 2003-07-09
Anticipated expiration: 2012-06-25

Abstract

The utility model discloses an improved optical mouse and comprises a mouse case, and a circuit wafer is arranged inside the mouse case, a CMOS image sensing component is arranged on the circuit wafer, and an image retrieving unit is arranged inside the CMOS image sensing component and provided with a viewing window; an SMT-typed LED lamp which emits light downwards is arranged at the bottom of the circuit wafer and is close to the image retrieving unit, a lens group is arranged under the viewing window and the SMT-typed LED lamp and is provided with an image magnifying lens and a prism, wherein, the image magnifying lens is corresponding to the viewing window, and the prism is corresponding to the SMT-typed LED lamp. The utility model can reduce the volume of the whole body, and a light source emits light downwards, thus shortening light path without affecting emitting brightness; as the light path of the light source is shortened, a light source with lower brightness such as the SMT-typed LED lamp can be used, thus not only achieving higher brightness but also saving power source that provides the light source.

Description

Improved optical mouse

Technical field

The utility model relates to a kind of mouse, relates in particular to a kind of light path that shortens light source, with the energy of saving light source irradiation, and the improved optical mouse that can reduce the shared space of light source.

Background technology

As shown in Figure 4, it is an existing optical mouse, be provided with a circuit board 71 in the housing 7 of this mouse, this circuit board 71 is provided with an electronic package 72 and the CMOS image sensing component 73 for this mouse normal operation, this CMOS image sensing component 73 is provided with an image acquisition unit 74, CMOS image sensing component 73 1 sides on this circuit board 71, be provided with a led light source 8 that laterally shines, and be provided with a lens combination 9 in these circuit board 71 bottoms, this lens combination 9 is provided with an image amplifying lens 91 and a prism 92, this image amplifying lens 91 is positioned at image acquisition unit 74 belows of CMOS image sensing component 73, and this prism 92 is positioned at led light source 8 the place aheads, and this prism 92 is provided with first plane of refraction 921, second plane of refraction 922 and third reflect face 923.

Incident angle according to reflection law equals reflection angle, and make first plane of refraction 921 of this prism 92, earlier with led light source 8 horizontal illumination path, be projected to second plane of refraction 922, be projected to third reflect face 923 again, by third reflect face 923 light path is projeced in the pick-up image scope of this image acquisition unit 74 again, and makes the image that light source reflected on this this scope of image acquisition unit 74 fechtables, and then calculate this mouse moving distance and direction by this CMOS image sensing component 73.

Because for this prism 92 can be reflexed to led light source 8 in the pick-up image scope of this image acquisition unit 74 fully, according to total reflection principle, the angle of this light path working direction and first plane of refraction 921 and second plane of refraction, 922 normal L must surpass critical angle, could be with optical routing first plane of refraction 921 with light path total reflection to the second plane of refraction 922.When optical routing second plane of refraction 922 total reflections during to third reflect face 923, because the angle of this third reflect face 923 normal L and light path can be reflexed in the pick-up image scope of image acquisition unit 74 light path by third reflect face 923 less than critical angle.Yet, this prism 92 is a transparent plastic material, light is about 43 degree in the critical angle of this prism 92, therefore the angle of inclination of first plane of refraction 921 and second plane of refraction 922 must not be less than 43 degree, thus, these first and second plane of refraction 921,922 restrictions because of the angle of inclination make this prism 92 have certain volume, and can't reduce again.

As shown in Figure 5, because this led light source 8 is located at this CMOS image sensing component 73 1 sides, and be a laterally irradiation, it must pass through prism 92, will laterally be converted to an oblique irradiation down according to establishing, and therefore the light path of irradiation must be through the turnover of first, second and third plane of refraction 921,922,923 multiple tracks, could will laterally shine and be converted to an oblique irradiation down, thus, the path that makes light path advance is long, causes the loss of light source that brightness is reduced.

Moreover, because image acquisition unit 74 is when pick-up image, the scope that one brighter its acquisition of light source irradiation must be arranged, and be to remedy light source causes brightness because of the path is long deficiency, so industry uses the LED lamp of a high brightness as this light source usually, so can cause the consume of power supply on the contrary, when especially being used in mobile computer, the electric energy of easier its battery of consume.

In addition, according to establishing, so this circuit board 71 becomes big for these led light source 8 volumes are set to this led light source 8 because of laterally, and then occupies limited space in the mouse, makes this mouse reduced volume more in design.

Summary of the invention

In order to overcome the above-mentioned shortcoming that existing optical mouse exists, the utility model provides a kind of improved optical mouse, directly be located at circuit board bottom and contiguous CMOS image sensing component by this light source, can make whole reduction in bulk, and make this light source design be irradiation downwards, light path is shortened and do not influence the brightness of irradiation; Owing to shorten the light path of this light source, therefore can use a light source than low-light level, as SMT type LED lamp, not only brighter brightness can be obtained, and the power supply of this light source of supply can be saved.

The technical scheme that its technical matters that solves the utility model adopts is:

A kind of improved optical mouse, it comprises an on, is provided with a circuit board in this housing, and this circuit board is provided with a CMOS image sensing component, is provided with an image acquisition unit in this CMOS image sensing component, and this image acquisition unit is provided with a viewfinder; It is characterized in that, described circuit board bottom is provided with a SMT type LED lamp that shines downwards, this SMT type LED lamp is contiguous this image acquisition unit, described viewfinder and SMT type LED lamp below are provided with a lens combination, this lens combination is provided with an image amplifying lens and a prism, this image amplifying lens is with respect to this viewfinder, and this prism is with respect to this SMT type LED lamp.

Aforesaid improved optical mouse, wherein prism is provided with one first plane of refraction and one second plane of refraction, and this first plane of refraction is positioned at described SMT type LED lamp below, be greater than and the critical angle that equals this prism tilt, and the critical angle that this second plane of refraction is less than this prism tilts.

First and second plane of refraction by this prism, light path with the downward irradiation of this SMT type LED lamp, be projeced in the pick-up image scope of viewfinder of this image acquisition unit, and make the image that light path reflected on this this scope of image acquisition unit fechtable, and then calculate this mouse moving distance and direction by this CMOS image sensing component.

The beneficial effects of the utility model are, directly are located at circuit board bottom and contiguous CMOS image sensing component by this light source, can make whole reduction in bulk, and make this light source design be irradiation downwards, light path is shortened and do not influence the brightness of irradiation; Owing to shorten the light path of this light source, therefore can use a light source than low-light level, as SMT type LED lamp, not only brighter brightness can be obtained, and the power supply of this light source of supply can be saved.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the bottom-up three-dimensional appearance synoptic diagram of the utility model

Fig. 2 is the upward view of the utility model circuit board

Fig. 3 is the synoptic diagram that the utility model circuit board is analysed and observe and the light source light path reflects

Fig. 4 is the synoptic diagram of existing optical mouse inside

Fig. 5 is the synoptic diagram of existing optical mouse light source light path refraction

Embodiment

See also Fig. 1 to Fig. 3, the utility model is a kind of improved optical mouse, and it is provided with an on 1, and this housing 1 bottom is provided with a window 11, and be provided with a circuit board 2 in the housing 1, and circuit board 2 is provided with an electronic package 21 and a CMOS image sensing component 3 for this mouse normal operation.This CMOS image sensing component 3 is provided with an image acquisition unit 31, this image acquisition unit 31 is provided with a viewfinder 32, these circuit board 2 bottoms are provided with a SMT type LED lamp 4 that shines downwards, viewfinder 32 1 sides of this SMT type LED lamp 4 contiguous these image acquisition units 31, and below this viewfinder 32 and this SMT type LED lamp 4, be provided with a lens combination 5.This lens combination 5 is positioned on the window 11 of this housing 1 bottom, and this lens combination 5 is provided with an image amplifying lens 51 and a prism 52, this image amplifying lens 51 is the belows that are positioned at viewfinder 32, this prism 52 is provided with one first plane of refraction 521 and one second plane of refraction 522, and this first plane of refraction 521 is positioned at this SMT type LED lamp 4 belows, be greater than and the critical angle that equals this prism 52 tilt, and the critical angle that this second plane of refraction 522 is less than this prism 52 tilts.

According to reflection law and total reflection principle, make first plane of refraction 521 of this prism 52, light path with the 4 downward irradiations of SMT type LED lamp, total reflection to the second plane of refraction 522, again by second plane of refraction 525, light path is projeced in the pick-up image scope of viewfinder 32 of this image acquisition unit 31, and makes on this image acquisition unit 31 this scope of acquisition by viewfinder 32, the image that light source reflected, and then calculate this mouse moving distance and direction by this CMOS image sensing component 3.

Because this SMT type LED lamp 4 is directly to be located at circuit board 2 bottoms, and this SMT type LED lamp is the light fixture of a small size, therefore can make the reduction in bulk of circuit board 2 integral body, and then reduce the volume of this mouse.

Moreover, this SMT type LED lamp 4 is the light paths of shining downwards, therefore this prism 52 need only be provided with first plane of refraction 521 and second plane of refraction 522, and the angle of this first plane of refraction 521 normal L and light path is greater than critical angle, and the angle of second plane of refraction, 522 normal L and light path is less than critical angle, light path can be projected in the pick-up image scope of viewfinder 32, and can reduce the volume of prism 52, and because need only be via first, two planes of refraction 521,522 refraction, light path can be projected in the pick-up image scope of viewfinder 32, and light path is shortened, and improve the brightness of irradiation, make the light source that has abundance in the pick-up image scope of this viewfinder 32.

In addition,, therefore can use a SMT type LED lamp 4 than low-light level, not only can improve brightness, and can save the power supply of this SMT type of supply LED lamp 4 owing to shorten the light path of light source projects.

Claims

1. improved optical mouse, it comprises an on, is provided with a circuit board in this housing, and this circuit board is provided with a CMOS image sensing component, is provided with an image acquisition unit in this CMOS image sensing component, and this image acquisition unit is provided with a viewfinder; It is characterized in that, described circuit board bottom is provided with a SMT type LED lamp that shines downwards, this SMT type LED lamp is contiguous this image acquisition unit, described viewfinder and SMT type LED lamp below are provided with a lens combination, this lens combination is provided with an image amplifying lens and a prism, this image amplifying lens is with respect to this viewfinder, and this prism is with respect to this SMT type LED lamp.

2. improved optical mouse according to claim 1, it is characterized in that described prism is provided with one first plane of refraction and one second plane of refraction, and this first plane of refraction is positioned at described SMT type LED lamp below, be greater than and the critical angle that equals this prism tilt, and the critical angle that this second plane of refraction is less than this prism tilts.