CN1497495A

CN1497495A - Optical image detector and navigation device using the detector

Info

Publication number: CN1497495A
Application number: CNA2003101138773A
Authority: CN
Inventors: 郑完教
Original assignee: ABAKBAK SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: ABAKBAK SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2002-10-23
Filing date: 2003-10-23
Publication date: 2004-05-19
Anticipated expiration: 2023-10-23
Also published as: CN1256655C

Abstract

Optical image detectors and navigation devices employing the same are provided. The optical image detector illuminates incident lights on a surface of an object to generate an image for surface morphology of the object. The optical image detector includes a light source and an incident light generator that receives lights of the light source to generate incident lights. The incident lights include at least two groups of incident lights having different incident angles with respect to the surface of the object. The navigation device employs the optical image detector. The navigation device includes a case having a lower panel. The lower panel has an opening. The optical image detector is installed in the case. The incident light generator receives lights of the light source to generate the incident lights. The incident lights are illuminated on the surface of the object through the opening.

Description

Optical imagery detecting device and use the guider of this detecting device

The cross reference of related application

It is KR2002-64988 that the application has application number, and the applying date is the right of priority of the korean patent application on October 23rd, 2002, and its disclosed content is quoted as a reference herein.

Technical field

The present invention relates to the guider of optical imagery detecting device and this detecting device of use.

Background technology

Optical mouse is used for moving the position that is presented at the cursor on digital scanner or the display unit, and it has adopted the fluorescence detector that can differentiate the object contrast.Particularly, optical mouse have a light emitting devices be used for such as the rayed of infrared or visible line on the worktable surface of placing optical mouse.

Tullis has described in U.S. Pat 5686720 has the optical mouse of optimizing lighting condition, and name is called " method and apparatus that is used to obtain the high-contrast surface illumination ".In U.S. Pat 5686720, disclose a kind of optical mouse, it is characterized in that, incident angle has been mapped to medium with irregular surface form (as, worktable) surface less than 16 ° illumination.Incident angle refers to the angle between incident ray and the dielectric surface.

Fig. 1 is a square section synoptic diagram, shows some shortcomings of the fluorescence detector that adopts in traditional optical mouse.

Referring to Fig. 1, be radiated at the surface of worktable 5 by the incident light 7 of light emitting devices (not shown) generation.Light emitting devices is located in the housing of the optical mouse that moves on the worktable 5, and the window that incident ray 7 forms by presumptive area on the housing base plate illuminates the surface of worktable 5.

Worktable 5 is made up of horizontal panel 1.The surface of horizontal panel 1 has tiny projection, such as first to

fourth projection

3a, 3b, 3c and 3d.In general,

projection

3a, 3b, the height of 3c and 3d has nothing in common with each other, and the distance between projection is also inconsistent.For example, as shown in Figure 1, the second projection 3b and the 3rd projection 3c can be between the first projection 3a and the 4th projection 3d, and the second projection 3b and the 3rd projection 3c can be lower than the first projection 3a.In this case, when incident ray 7 when being radiated at worktable 5 surperficial less than 16 ° incident angle α since the first and the 4th projection 3a and each self-forming of 3d the 1st and the 2nd shadow region 9a and 9b.Therefore, incident ray 7 may not can shine the second projection 3b and the 3rd projection 3c.

Simultaneously, optical sensor 13 is positioned on the worktable 5.Optical sensor 13 is installed in the housing of optical mouse.Optical sensor 13 detects light 11 from worktable 5 surface reflections to produce the two dimensional image corresponding to worktable 5 configurations of surface.Optical sensor 13 comprises polynary pixel two-dimensional matrix, and the photocurrent that each pixel produces is corresponding to each regional brightness in the image.Therefore, if the photocurrent that can discern greater than the zone of each pixel, is exported corresponding to the pixel of the first shadow region 9a so in the zone of the first shadow region 9a.So can not produce corresponding to the image of the second and the 3rd projection 3b and 3c.Thereby be difficult to obtain to have the configuration of surface image of high-resolution worktable 5.This may make the performance of optical mouse descend.So, even optical mouse moves on worktable, the cursor of indication optical mouse current location also may not can move on display unit.

Because incident light has little incident angle, similarly be difficult so will obtain to have high-resolution worktable surface aspect graph according to traditional optical mouse.Therefore optical mouse may lose efficacy.

Summary of the invention

A feature of the present invention provides the optical imagery detecting device, and these detecting devices can improve the image resolution ratio to the body surface form.

Another feature of the present invention provides optical mouse, and it adopts high performance optical imagery detecting device, can produce accurate position signalling.

Another feature of the present invention provides guider, and they adopt high performance optical imagery detecting device, accurate model that can recognition object.

According to an aspect of the present invention, provide a kind of optical imagery detecting device, it is mapped to object surfaces to produce the image of body surface form with incident illumination.The optical imagery detecting device comprises light source and is used to produce the incident light generator of response from the incident light of the light of light source.Incident light comprises at least two groups become different incidence angles with body surface incident light.

According to embodiments of the invention, incident light generator can comprise: first reflecting plate, its reflection sources are from the light of light source, and generation has the first group of incident light that becomes first incident angle with body surface; Second reflecting plate, its reflection sources produce the incident light that has greater than second group of second incident angle of first incident angle from the light of light source; The 3rd reflecting plate, its reflection sources produce the 3rd group of incident light that has greater than the 3rd incident angle of second incident angle from the light of light source.

Equally, the present invention may further include optical sensor, and it places object surfaces, in order to the light of inspected object surface reflection.The function of optical sensor is that the image transitions with the body surface form becomes photocurrent.

According to a further aspect in the invention, provide guider.This guider can match with the mode discriminator that the optical mouse that moves at body surface maybe can be discerned human fingerprint.Guider has adopted high performance optical imagery detecting device.Guider comprises the housing with base plate.This base plate has the window that penetrates the base plate presumptive area.Light source is placed in the housing, and incident light generator is placed on contiguous light source place.The light that incident light generator will come from light source converts at least two groups become different incidence angles with body surface incident light to.The incident light that comes from incident light generator shines object surfaces by window.

According to the present invention, have at least two groups to become the incident illumination of different incidence angles to be mapped on the object surfaces with body surface.Therefore, it can improve the image resolution ratio of body surface form such as worktable or human fingerprint.

Description of drawings

For a person skilled in the art, will make aforementioned features of the present invention and advantage become more clear by accompanying drawing and in conjunction with description to preferred embodiment.

Fig. 1 is the square section synoptic diagram, and the principle of operation of traditional optical visual detector has been described;

Fig. 2 is the square section synoptic diagram, and the principle of operation according to optical imagery detecting device of the present invention has been described;

Fig. 3 is the square section synoptic diagram according to the optical imagery detecting device of the embodiment of the invention;

Fig. 4 is the digital scanner synoptic diagram that adopts according to optical imagery detecting device of the present invention; And

Fig. 5 is the square section synoptic diagram that adopts according to the optical mouse of optical imagery detecting device of the present invention.

Embodiment

In conjunction with the accompanying drawings the present invention is described more fully now, wherein provided the preferred embodiments of the present invention.Yet the present invention can have different forms of implementation, should not limit the invention to given embodiment.And, make the present invention fully open by these embodiment are provided, and given full expression to scope of the present invention to those of skill in the art.In the accompanying drawings, for the sake of clarity, the thickness of each interlayer and each zone are by exaggerative.In whole instructions, same mark is represented same parts.

Fig. 2 is the square section synoptic diagram according to the principle of operation of the optical imagery detecting device of the embodiment of the invention.

Referring to Fig. 2, incident illumination is mapped on the surface of object 5 (worktable for example shown in Figure 1).As shown in Figure 1, object 5 comprises a plurality of

kick

3a, 3b, 3c and 3d that are irregularly formed in its surface.Compare with known technology, incident light comprises that at least two groups have the incident light of different incidence angles.For example, incident light can comprise first to the 3rd group of

incident light

51,53 and 55 shown in Figure 2.First group of incident light 51 shines on the object 5, becomes the first incident angle α 1 with object 5 horizontal surfaces; Second group of incident light 53 shines on the object 5, becomes the second incident angle α 2 greater than the first incident angle α 1 with object 5 horizontal surfaces.Equally, the 3rd group of incident light 55 shines on the object 5, becomes the 3rd incident angle α 3 greater than the second incident angle α 2 with object 5 horizontal surfaces.Like this, because the effect of first to the 3rd group of

incident light

51,53 and 55 just can clearly form the second and the 3rd projection 3b and the shade of 3c and the shade of the first and the

4th projection

3a and 3d between the first and the 4th projection 3a and 3d.Herein, the scope of incident angle is between 0 ° to 90 °.

Further, first to the 3rd group of

incident ray

51,53 and 55 formed some other shade altogether, these shades and each

projection

3a, and 3b, the height of 3c and 3d and

projection

3a, 3b, each between 3c and the 3d is corresponding at interval.For example, compared with the prior art, the shade of the second and the

3rd projection

3b and 3c and the shade of the first projection 3a can clearly form in the zone between the first projection 3a and the 4th projection 3d.In more detail, the first shadow region 57a that is shone by any

incident light

51,53 or 55 is not at each

projection

3a, 3b, the side of 3c and 3d forms, and only the second shadow region 57b that is shone by the 3rd group of incident light 55 then is being close to first shadow region 57a formation.In addition, formed the 3rd shadow region 57c that is adjacent to the second shadow region 57b by second and the 3rd group of

incident light

53 and 55 common irradiations.Therefore, by

shadow region

57a, 57b, the combination of 57c has formed corresponding to each

projection

3a, 3b, the height of 3c and 3d and each

projection

3a, 3b, the final shadow region at interval between 3c and the 3d.

As a result, just can produce and the approaching image of object 5 real surface forms, because compared with prior art, final shadow region can be divided into how discerptible rank.

Fig. 3 is the square section synoptic diagram, in order to the principle of operation of optical imagery detecting device in the explanation embodiment of the invention.

Referring to Fig. 3, incident light generator 59 is placed on object 5 top on one side.Object 5 can be corresponding work platform or people's a finger.First to the

3rd incident light

51,53 and 55 that incident light generator 59 produces as shown in Figure 2.Light source 61 is installed in the top of incident light generator 59.Light source 61 sends such as infrared or visible line, and the irradiate light that comes from light source 61 is on incident light generator 59.

Incident light generator 59 comprises a plurality of reflecting plates.For example, incident light generator 59 can comprise the first reflecting plate 59a, the second reflecting plate 59b and the 3rd reflecting plate 59c, and their reflections are from the light of light source 61.The first reflecting plate 59a is the inclined-plane that becomes first angle beta 1 with the surface level of object 5, and the second reflecting plate 59b is the inclined-plane that has greater than second angle beta 2 of first angle beta 1, and the 3rd reflecting plate 59c is the inclined-plane that has greater than the third angle degree β 3 of second angle beta 2.In this case, preferably the second reflecting plate 59b is provided with lowlyer than the height of the 3rd reflecting plate 59c, and the first reflecting plate 59a is provided with lowlyer than the height of the second reflecting plate 59b.This be for all optical energy irradiations of making the reflecting plate surface reflection on the presumptive area of object 5.Equally, preferably the first reflecting plate 59a stretches out manyly than the second reflecting plate 59b, and the second reflecting plate 59b stretches out more than the 3rd reflecting plate 59c.Like this, from consistent first to the 3rd reflecting plate 59a that shines of light that light source 61 sends downwards, on 59b and the 59c, from reflecting plate 59a, the incident light of 59b and 59c reflection then can be divided into first to the 3rd group of

incident light

51,53 and 55 as described in Figure 2.

Optical sensor is positioned over the top of object 5.Optical sensor is made up of a plurality of two dimensional array of pixels.Each pixel produces a photocurrent or a photovoltage, corresponding to the brightness from the light of object 5 surface reflections.As a result, compared with prior art, because adopted two groups to have the incident light of different incidence angles and improved the resolution of object 5 configuration of surface optical imagerys at least.

Fig. 4 has provided the synoptic diagram of the digital scanner that adopts optical imagery detecting device shown in Figure 3.

Referring to Fig. 4, comprise optical imagery detecting device shown in Figure 3 according to the digital scanner of the embodiment of the invention.Photocurrent or the photovoltage exported by the optical sensor 63 of optical imagery detecting device convert data image signal to by signal processing unit 73.Digital processing element 73 comprises: analog to digital converter (A/D converter) 67, and its a series of photocurrents or photovoltage with the pixel output of optical sensor 63 converts digital signal to; And image data processor 69, it estimates the light quantity corresponding to entire image on from the digital signal basis of A/D converter 67.Pass to system controller 71 from the signal of image data processor 69 outputs.

Signal processing unit 73 may further include the autocollimatior 65 of electric control, and it is installed between A/D converter 67 and the optical sensor 63.Dimmer 65 is spent the total amount such as the optical signalling of photocurrent or photovoltage that controller is being controlled optical sensor 63 output as a comparison.Dimmer 65 can be installed in the front of optical sensor 63.In this case, dimmer 65 control reflections are from total light intensity on object 5 surfaces.The control of dimmer 65 subject image data processors 69.Perhaps, dimmer 65 can be subjected to the control of system controller 71.

Fig. 5 is the square section synoptic diagram that has adopted the optical mouse of optical imagery detecting device shown in Figure 3.

Referring to Fig. 5, optical mouse 100 is placed on the surface of object 5 (worktable for example shown in Figure 1).Optical mouse 100 comprises a housing 101 that has base plate 101a.A window 101b who penetrates presumptive area is arranged on the base plate 101a.Light source 61 shown in Fig. 3, incident light generator 59 and optical sensor 63 are placed in the housing 101.Therefore, convert the light of light source 61 emission to first to the 3rd group of

incident light

51,53 and 55 by incident light generator shown in Figure 3 59,

incident light

51,53,55 shine on the surface of object 5 by window

101b.Incident light

51,53 and 55 is reflected on the surface of object 5, and reflected light 60 shines on the optical sensor 63 that is positioned at window 101b top.63 pairs of reflected light 60 of optical sensor are made induction, thereby have produced the light signal such as photocurrent or photovoltage corresponding to the 5 configuration of surface images of object under the window 101b.

Optical sensor 63 is placed on the printed circuit board (PCB) 103, and printed circuit board (PCB) is installed on the housing 101.Identification of lines on the printed circuit board (PCB) 103 is handled successively from the light signal of optical sensor 63 outputs, thereby draws the total amount of reflected light 60.As long as mouse moves, the amount of reflected light 60 will change.This is because of there is irregular tiny projection on the surface of object 5.Just can follow the tracks of by changing catoptrical amount like this mouse moving.

Switch module 105 is placed in the presumptive area of printed circuit board (PCB) 103.Horizontal bar 107 is positioned over switch module 105 tops, and an end of horizontal bar 107 links to each other with hinge 109 in being fixed on housing 101.Same button 111 is attached to an other end of horizontal bar 107, and an aperture of the presumptive area of button 111 by penetrating housing 101 top panels protrudes upward.By an elastomeric element (not shown) such as spring, horizontal bar 107 is lifted and separate with switch module 105.Therefore, as long as button 111 is pressed, switch module 105 will be opened.As a result, if press the button 111, will carry out operation so corresponding to the position of cursor indication.

Simultaneously, incident light generator 59 shown in Figure 3 can be used for guider, such as the mode discriminator of the human fingerprint of identification.In this case, the object shown in Fig. 4 and Fig. 55 can be human fingerprint.

According to the present invention, the incident illumination that at least two groups have different incidence angles is mapped to object surfaces.Like this, just make the resolution that improves body surface aspect graph picture become possibility.

Claims

1. optical imagery detecting device, it is mapped to incident illumination and produces body surface aspect graph picture on the object surfaces, and this optical imagery detecting device comprises:

Light source; And

Incident light generator, it accepts the light of light source to produce at least two groups become different incidence angles with body surface incident light.

2. optical imagery detecting device according to claim 1, wherein incident light generator comprises:

First reflecting plate, the light of its reflection source is to produce the first group of incident light that has first incident angle with body surface;

Second reflecting plate, the light of its reflection source has second group of incident light greater than second incident angle of first incident angle to produce with body surface;

The 3rd reflecting plate, the light of its reflection source has the 3rd group of incident light greater than the 3rd incident angle of second incident angle to produce with body surface.

3. optical imagery detecting device according to claim 1 further comprises optical sensor, and optical sensor places on the body surface, and the light of body surface reflection is made induction, and wherein, optical sensor looks like to convert to photocurrent with the body surface aspect graph.

4. guider comprises:

Housing, this housing has the base plate that has window;

Be installed in the light source in the housing; And

The incident light generator adjacent with light source, thus the light that it receives from light source produces at least two groups become different incidence angles with body surface incident light, and wherein incident light shines on the body surface by window.

5. guider according to claim 4, wherein light source is the light emitting devices that produces infrared or visible line.

6. guider according to claim 4, wherein at least two group incident lights comprise:

The first group of incident light that has first incident angle with body surface;

Have second group of incident light with body surface greater than second incident angle of first incident angle;

Have the 3rd group of incident light with body surface greater than the 3rd incident angle of second incident angle.

7. guider according to claim 6, wherein incident light generator comprises:

First reflecting plate, the light of its reflection source is to produce first group of incident light;

Second reflecting plate, the light of its reflection source is to produce second group of incident light;

The 3rd reflecting plate, the light of its reflection source is to produce the 3rd group of incident light.

8. guider according to claim 4 further comprises the optical sensor that places the window top that the light of body surface reflection is made induction, and wherein optical sensor becomes photocurrent with the image transitions of body surface form.