CN102880313A - Optical finger navigation module and light source unit thereof - Google Patents
Optical finger navigation module and light source unit thereof Download PDFInfo
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- CN102880313A CN102880313A CN2011101981928A CN201110198192A CN102880313A CN 102880313 A CN102880313 A CN 102880313A CN 2011101981928 A CN2011101981928 A CN 2011101981928A CN 201110198192 A CN201110198192 A CN 201110198192A CN 102880313 A CN102880313 A CN 102880313A
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- luminescence chip
- plane
- light
- light source
- transmission package
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Abstract
The invention discloses an optical finger navigation module and a light source unit thereof. The light source unit is arranged on a plane and used for providing a light beam which is inclined relative to the plane. The light source unit comprises a light-emitting chip and a light-transmission package, wherein the light-emitting chip is provided with an upper surface and a lower surface, which are approximately parallel to the plane; the light-transmission package is physically contacted with the light-emitting chip and at least covers the upper surface of the light-emitting chip; and the light-transmission package is provided with an inclined surface which is positioned above the upper surface of the light-emitting chip and inclined to the upper surface. Moreover, the invention also provides the optical finger navigation module with the light source unit.
Description
Technical field
The present invention relates to a kind of load module of electronic installation, relate in particular to a kind of optical pointing module.
Background technology
Optical point (optical finger navigation, OFN) module has that volume is little, accurate positioning is high and the characteristics such as power consumption is low, detect the movement of finger by optical mode, replace traditional Multi-aspect key, can be widely used in intelligent mobile phone, media player, digital camera, and the portable electronic devices such as GPS navigation machine.
Optical pointing module is that the light beam in specific wavelength interval that a light-emitting component is launched is projected on the determinand, make sensing element can clearly obtain the image of determinand, by the image that the comparison different time points obtains, judge moving direction and the distance of determinand.Because for asking manufacturing easy, optical pointing module in the past can be arranged at light-emitting component and sensing element on the same circuit board, the light beam deviation that therefore need to light-emitting component be sent by optical elements such as water chestnut mirrors, and directive determinand obliquely, so that sensing element can receive the image light that determinand reflects smoothly.
Yet, because the water chestnut mirror needs certain thickness that enough optical path differences are provided, so that the light beam deviation to special angle, so that the integral thickness of optical pointing module is thicker, is difficult to be useful on the thin light short and small portable electronic devices.
Summary of the invention
A purpose of the present invention is to provide a kind of light source cell, need not the water chestnut mirror etc. extra optical element the light beam of oblique fire can directly be provided.
Another object of the present invention is to provide a kind of optical pointing module with above-mentioned light source cell, need not the water chestnut mirror etc. extra optical element so that the light beam deviation.
The present invention discloses a kind of light source cell, is arranged on the plane and in order to a light beam that tilts with respect to this plane to be provided.This light source cell comprises a luminescence chip, and a light transmission package.Luminescence chip has a upper surface and a lower surface that is roughly parallel to this plane.The light transmission package entity contacts this luminescence chip and covers at least the upper surface of this luminescence chip, and this light transmission package has the upper surface top that is positioned at this luminescence chip and an inclined-plane that favours this upper surface.
In addition, the present invention also discloses a kind of optical pointing module with above-mentioned light source cell, in order to the movement of sensing one determinand.This optical pointing module comprises one and uses plane, a circuit board, a light source cell, and a sensing cell.Use the plane to slide thereon for this determinand.Circuit board is positioned at this below, use plane and is roughly parallel to this use plane.Light source cell is arranged on this circuit board and in order to a light beam that tilts with respect to this use plane to be provided towards this use plane.Sensing cell is arranged on this circuit board and in order to the image towards this use plane this determinand of sensing.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the cut-open view of the optical pointing module of the first embodiment of the present invention;
Fig. 2 is the cut-open view of the light source cell of the first embodiment of the present invention;
Fig. 3 is the schematic diagram of the light source cell of the first embodiment of the present invention;
Fig. 4 is the cut-open view of the optical pointing module of the second embodiment of the present invention;
Fig. 5 is the partial sectional view of the light source cell of the second embodiment of the present invention.
Wherein, Reference numeral
Embodiment
But the point of optical pointing module sensing one determinand of the present invention touches movement, and movable signal corresponding to electronic installation that uses this optical pointing module is provided.Fig. 1 is the first embodiment of optical pointing module of the present invention.This optical pointing module 50 mainly comprises one and uses plane 51, a circuit board 52, a sensing cell 54, and a light source cell 40.
This use plane 51 provides this determinand 60 surperficial thereon slip of putting tactile or any direction.In the present embodiment, this determinand 60 is not then limit with this during actual enforcement take a finger as example.This circuit board 52 be positioned at these 51 belows, use plane and with this use plane 51 be separated by a preset distance and both almost parallels.This light source cell 40 is arranged on the upper surface of this circuit board 52, and in order to use plane 51 emissions one with respect to this light beam that uses the upper surface on plane 51 to tilt towards this.
As shown in Figure 2, this light source cell 40 comprises a luminescence chip 44 and a light transmission package 42.This luminescence chip 44 has a upper surface 441 and a lower surface 442 of almost parallel.Specifically, this light-emitting component 44 can be vertical cavity surface emitting laser (VCSEL) (Vertical-Cavity Surface Emitting Laser, VCSEL) chip.These light transmission package 42 entities are contacted with this luminescence chip 44, and the upper surface 441 that covers this luminescence chip 44 with and all sides.This light transmission package 42 has the bottom surface 424 of the lower surface 442 of this luminescence chip 44 of an almost parallel.In the present embodiment, this light transmission package 42 is to encapsulate airtightly this luminescence chip 44, uses the injury-free or oxidation of protection luminescence chip 44 and affects the characteristics of luminescence.
What need pay special attention to is that this light transmission package 42 has an inclined-plane 422 of upper surface 441 tops that are positioned at this luminescence chip 44, and this inclined-plane 422 is to favour this upper surface 441.Specifically, the incidence angle θ 1 of these inclined-plane 422 relative these upper surfaces 441 is between 25 degree between 5 degree.After light that this luminescence chip 44 upwards sends enters this light transmission package 42, can produce refraction when running into this inclined-plane 422.Through the refraction on this inclined-plane 422, the direct of travel I2 of light can press from both sides a refraction angle θ 2 with the normal direction I1 of the upper surface 441 of this luminescence chip 44.Specifically, as shown in Figure 3, after the light of this luminescence chip 44 is upwards launched by its upper surface 441, can be incident in this inclined-plane 422 with the angle that is same as this incidence angle θ 1, and because the difference of inclined-plane both sides refractive index about in the of 422, this light can outwards be penetrated with this refraction angle θ 2 by this inclined-plane 422 according to refraction law.This refraction angle θ 2 is between 40 degree between 7 degree.
In addition, in another embodiment of the present invention, in the situation that need not to consider this luminescence chip 44 of level Hermetic Package, this light transmission package 42 can only keep this luminescence chip 44 upper surface 441 directly over projection section, and mat inclined-plane 422 reaches above-mentioned reflective functions.
As shown in Figure 1, this sensing cell 54 is arranged on this circuit board 52 and towards the image of this use plane this determinand 60 of 51 sensings.This sensing cell 54 can be CMOS (Complementary Metal Oxide Semiconductor) (CMOS) Image Sensor, but not as limit.This sensing element 54 is in order to receiving the reflection ray of determinand 60 on the upper surface on this use plane 51, and this light is converted to corresponding electric signal.
In addition, the optical pointing module of the present embodiment also comprises a light shield 56 that is located on this sensing cell 54.This light shield 56 has the open-work 562 that a light beam that reflects for this plane 51 passes through.By at this sensing cell 54 this light shield 56 being set, can prevent that other extraneous light from being received by this sensing cell 54.
As shown in Figure 4, the second embodiment of optical pointing module of the present invention, roughly identical with the first embodiment, difference is this light source cell 70.As shown in Figure 5, this light source cell 70 also comprises the substrate 76 that entity contacts the lower surface 742 of this luminescence chip 74.This substrate 76 has the insulation course 762 that one first electrode layer 761, that is connected with this luminescence chip 74 is positioned at these the first electrode layer 761 belows, and a second electrode lay 763 that is positioned at these insulation course 762 belows and is electrically connected with this first electrode layer 761.This first electrode layer 761 is to pass or walk around this insulation course 762 with wire to be electrically connected with this second electrode lay 763, uses and utilizes the second electrode lay 763 to be electrically connected on the circuit board of electronic installation in the surface mount mode.And this substrate 76 is to cooperate to encapsulate airtightly this luminescence chip 74 with this light transmission package 72, the injury-free or oxidation with protection luminescence chip 74 and affect the characteristics of luminescence.
In sum, above-described embodiment is by directly forming this inclined-plane 422,722 in order to refracted ray on this light transmission package 42,72, light transmission package 42,72 by this inclined-plane 422,722 belows provides different optical path differences, need not use in addition the water chestnut mirror, just can reach the effect of refracted ray.So, not only can make level Hermetic Package with protection luminescence chip 44,74 to luminescence chip 44,74, the function of light refraction also can be provided simultaneously.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1. light source cell is arranged on the plane and in order to a light beam that tilts with respect to this plane to be provided, it is characterized in that, this light source cell comprises:
One luminescence chip has a upper surface and a lower surface of being roughly parallel to this plane; And
One light transmission package, entity contact this luminescence chip and cover at least the upper surface of this luminescence chip, and this light transmission package has the upper surface top that is positioned at this luminescence chip and an inclined-plane that favours this upper surface.
2. light source cell according to claim 1 is characterized in that, this inclined-plane relatively angle of this upper surface inclination is spent between 25 degree between 5.
3. light source cell according to claim 1 is characterized in that, this light transmission package covers the upper surface of this luminescence chip, and this light transmission package has the bottom surface on parallel this plane.
4. light source cell according to claim 3 is characterized in that, this light transmission package encapsulates this luminescence chip airtightly.
5. light source cell according to claim 1, it is characterized in that, also comprise the substrate that entity contacts the lower surface of this luminescence chip, this substrate has the insulation course that one first electrode layer, that is connected with this luminescence chip is positioned at this first electrode layer below, and a second electrode lay that is positioned at this insulation course below and is connected with this first electrode layer.
6. light source cell according to claim 5 is characterized in that, this substrate cooperates with this light transmission package and encapsulates airtightly this luminescence chip.
7. light source cell according to claim 1 is characterized in that, this luminescence chip is a vertical cavity surface emitting laser (VCSEL) chip.
8. optical pointing module, the movement in order to sensing one determinand is characterized in that, this optical pointing module comprises:
One uses the plane, slides thereon for this determinand;
One circuit board is positioned at this below, use plane and is parallel to this use plane;
One light source cell is arranged on this circuit board and in order to a light beam with respect to this use plane inclination to be provided towards this use plane, this light source cell comprises a luminescence chip and a light transmission package; This luminescence chip has a upper surface and a lower surface that is parallel to this circuit board, this light transmission package entity contacts this luminescence chip and covers at least the upper surface of this luminescence chip, and this light transmission package has the upper surface top that is positioned at this luminescence chip and an inclined-plane that favours this upper surface; And
One sensing cell is arranged on this circuit board and in order to the image towards this use plane this determinand of sensing.
9. optical pointing module according to claim 8 is characterized in that, this inclined-plane relatively angle of this upper surface inclination is spent between 25 degree between 5.
10. optical pointing module according to claim 8 is characterized in that, this light transmission package covers the upper surface of this luminescence chip, and this light transmission package has the bottom surface on parallel this plane.
11. optical pointing module according to claim 10 is characterized in that, this light transmission package encapsulates this luminescence chip airtightly.
12. optical pointing module according to claim 8, it is characterized in that, this light source cell also comprises the substrate that entity contacts the lower surface of this luminescence chip, this substrate has the insulation course that one first electrode layer, that is connected with this luminescence chip is positioned at this first electrode layer below, and a second electrode lay that is positioned at this insulation course below and is connected with this first electrode layer.
13. optical pointing module according to claim 12 is characterized in that, this circuit board cooperates with this light transmission package and encapsulates airtightly this luminescence chip.
14. optical pointing module according to claim 8 is characterized in that, this luminescence chip is a vertical cavity surface emitting laser (VCSEL) chip.
15. optical pointing module according to claim 8 is characterized in that, also comprises a light shield that is located on this sensing cell, this light shield has the open-work that this light beam that reflects for this plane passes through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110198192.8A CN102880313B (en) | 2011-07-15 | 2011-07-15 | Optical pointing module and light source cell thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110198192.8A CN102880313B (en) | 2011-07-15 | 2011-07-15 | Optical pointing module and light source cell thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102880313A true CN102880313A (en) | 2013-01-16 |
| CN102880313B CN102880313B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110198192.8A Active CN102880313B (en) | 2011-07-15 | 2011-07-15 | Optical pointing module and light source cell thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW483177B (en) * | 1999-11-30 | 2002-04-11 | Omron Tateisi Electronics Co | Optical device and machine for utilizing the same |
| US6872931B2 (en) * | 2000-11-06 | 2005-03-29 | Koninklijke Philips Electronics N.V. | Optical input device for measuring finger movement |
| TW201108469A (en) * | 2009-06-22 | 2011-03-01 | Nichia Corp | Luminescence device |
| TW201120691A (en) * | 2009-09-30 | 2011-06-16 | Sharp Kk | Optical pointing device and electronic device including the same, and light guide and method of guiding light |
-
2011
- 2011-07-15 CN CN201110198192.8A patent/CN102880313B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW483177B (en) * | 1999-11-30 | 2002-04-11 | Omron Tateisi Electronics Co | Optical device and machine for utilizing the same |
| US6872931B2 (en) * | 2000-11-06 | 2005-03-29 | Koninklijke Philips Electronics N.V. | Optical input device for measuring finger movement |
| TW201108469A (en) * | 2009-06-22 | 2011-03-01 | Nichia Corp | Luminescence device |
| TW201120691A (en) * | 2009-09-30 | 2011-06-16 | Sharp Kk | Optical pointing device and electronic device including the same, and light guide and method of guiding light |
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| Publication number | Publication date |
|---|---|
| CN102880313B (en) | 2016-03-02 |
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