A kind of frustrated total internal reflection touching device
Technical field
The present invention relates to touch screen technology field, particularly relate to a kind of frustrated total internal reflection touching device.
Background technology
Application No. CN 104679346A, date of publication is that the application for a patent for invention on June 3rd, 2015 discloses a kind of multi-point touch panel based on suppressed power internal reflection technique.Including the touch screen base plate of formation total internal reflection, near the light source in the non-tactile face of touch screen base plate, forming the leaded light component of total internal reflection in light source guides touch screen base plate, reception is through the optical receiver etc. of the light of total internal reflection.Part is placed in the non-tactile face of touch screen base plate, by leaded light component change light source transmitting angle (ensure light angle of incidence in the touch surface touching substrate more than touch substrate relatively with the critical angle of air), in touch screen base plate, formation total internal reflection propagates to the other end of touch screen base plate and is detected by an optical receiver.When the touch surface generation touch operation of touch screen base plate, medium outside touch surface is become the refractive index fat (finger) more than panel material from air, light total internal reflection in touch screen base plate is suppressed, optical receiver detects that light intensity decays, thus judges that touch surface there occurs touch operation.In this technical scheme, the installation site of optical receiver and leaded light component requires very accurate, and installation difficulty is big.And, the shake of any one parts or position change all can cause light source to launch the change of angle, thus impact propagates to the light intensity of optical receiver by total internal reflection, once the inaccurate light intensity easilying lead to be formed total internal reflection in touch panel of installation site is inadequate.Reduce the capacity of resisting disturbance of touch screen, greatly reduce the touch precision of touch screen.
Summary of the invention
The present invention provides a kind of frustrated total internal reflection touching device relatively low to the installation site required precision of leaded light component and light source based on above-mentioned technical problem, improves the anti-interference of touching device and touch precision while reducing touching device installation difficulty.
A kind of frustrated total internal reflection touching device, including having the transparent body of end face and bottom surface, is provided with light-emitting tube in one end of described transparent body, and the other end of described transparent body is provided with light receiving tube;It is characterized in that: the bottom surface of described transparent body is provided with the incident illumination corresponding with described light-emitting tube and adjusts film and the emergent light corresponding with described light receiving tube adjustment film.Described incident illumination adjusts film and includes: the first smooth output layer and the first smooth input layer;Described first smooth output layer includes the first substrate being combined with described transparent body and the right-angle prismatic post micro structure being arranged in described first substrate;Described first smooth input layer includes the second substrate and is arranged on the convex lens micro structure in described second substrate;First right-angle surface of described right-angle prismatic post micro structure and described first smooth input layer laminating, the axis of described convex lens micro structure is perpendicular to described first right-angle surface;Described right-angle prismatic post micro structure makes to enter light total internal reflection in described transparent panel of described first smooth output layer through described first smooth input layer.Described emergent light adjusts film and includes: the second smooth input layer being combined with described transparent body and the second smooth output layer being combined with described second smooth input layer;Described second smooth input layer includes the first optical input surface being combined with described transparent body and the first light gasing surface being combined with described second smooth output layer, and described second smooth output layer includes the second optical input surface and the second light gasing surface being combined with described second smooth input layer;Described first light gasing surface makes the light at least partially in forming total internal reflection in described transparent body reach described second smooth output layer through described first light gasing surface, and exports described emergent light adjustment film through described second light gasing surface further.There is the described incident illumination of micro structure adjust film and described emergent light and adjust that membrane volume is little, thickness is little, be combined with described transparent body in bottom surface, easy for installation.
As preferably, described convex lens micro structure is planoconvex lens micro structure, and the crowning of described convex lens micro structure is towards described light-emitting tube.
As preferably, described convex lens micro structure has multiple, and in multiple described convex lens micro structure, convex lens micro structure described at least two is different from the height in described second substrate.The convex lens micro structure of differing heights corresponding different described light-emitting tube and described incident illumination can adjust the distance between film and angle, the light that most of described light-emitting tube sends is adjusted to directional light, and inject described right-angle prismatic post micro structure with vertical angle of incidence, improve touching device to described light-emitting tube installation site and the receiving degree of angle.
As preferably, described first smooth input layer includes multiple convex lens layer being equipped with described convex lens micro structure, multiple described convex lens layers height in described second substrate is different, and described convex lens micro structure makes each described convex lens micro structure the most overlapping in the short transverse of described second substrate in the distribution of described convex lens layer.
As preferably, in multiple described convex lens micro structures, the center thickness of convex lens micro structure described at least two is different.The corresponding different described light-emitting tube of described convex lens micro structure of different center thicknesses and described incident illumination adjust the distance between film and angle, the light that most of described light-emitting tube sends is adjusted to directional light, and inject described right-angle prismatic post micro structure with vertical angle of incidence, improve touching device to described light-emitting tube installation site and the receiving degree of angle.
As preferably, in multiple described convex lens micro structures, the diameter of convex lens micro structure described at least two is different.The described convex lens micro structure of different-diameter corresponding different described light-emitting tube and described incident illumination can adjust the distance between film and angle, the light that most of described light-emitting tube sends is adjusted to directional light, and inject described right-angle prismatic post micro structure with vertical angle of incidence, improve touching device to described light-emitting tube installation site and the receiving degree of angle.
As preferably, in multiple described convex lens micro structures, the center thickness of convex lens micro structure described at least two is different, and described at least two, the diameter of convex lens micro structure is different.
As preferably, in same described convex lens layer, the center thickness of the described convex lens micro structure being in marginal position is less than the center thickness of the described convex lens micro structure being in center.For being arranged on the light-emitting tube that incident illumination adjusts the center of film, what the light that can be sent by light-emitting tube was the most is adjusted to directional light, and inject described right-angle prismatic post micro structure with vertical angle of incidence, improve touching device to described light-emitting tube installation site and the receiving degree of angle.
As preferably, in same described convex lens layer, the diameter of the described convex lens micro structure being in marginal position is less than the diameter of the described convex lens micro structure being in center.For being arranged on the light-emitting tube that incident illumination adjusts the center of film, what the light that can be sent by light-emitting tube was the most is adjusted to directional light, and inject described right-angle prismatic post micro structure with vertical angle of incidence, improve touching device to described light-emitting tube installation site and the receiving degree of angle.
As preferably, described first smooth input layer includes that interior reflective surface, described interior reflective surface are arranged on the inwall of the end face being perpendicular to described transparent body of described second substrate.Increase the light intensity being converted into directional light in the light that described smooth light-emitting tube sends.
There is advantages that
1. incident illumination adjusts film and emergent light adjustment film is easy for installation;
2. the installation site required precision of light-emitting tube and light receiving tube is low;
3. incident illumination adjusts film and emergent light adjusts film, reduces the thickness of touching device.
Accompanying drawing explanation
Fig. 1 frustrated total internal reflection touching device structural representation.
Fig. 2 incident illumination adjusts membrane structure schematic diagram.
Fig. 3 emergent light adjusting apparatus structural representation.
Wherein, 1-transparent body, 11-end face, 12-bottom surface, 2-light-emitting tube, 3-light receiving tube, 4-incident illumination adjust film, 5-emergent light adjustment film, 41-the first substrate, 411-right angle trigonometry prism microstructures, 42-the second substrate, 421-convex lens micro structure, 4111-the first right-angle surface, the smooth input layer of 51-second, the smooth output layer of 52-second, 511-the first optical input surface, 512-the second optical input surface, 521-the second optical input surface, 522-the second light gasing surface, the 422-surface of emission.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the present invention are described in detail.
Such as Fig. 1, a kind of frustrated total internal reflection touching device, including having the transparent body 1 of end face 11 and bottom surface 12, it is provided with light-emitting tube 2 in one end of transparent body 1, the other end of transparent body is provided with light receiving tube 3.The bottom surface 11 of transparent body 1 is provided with the incident illumination corresponding with light-emitting tube 2 and adjusts film 4 and the emergent light corresponding with light receiving tube 3 adjustment film 5.
Incident illumination adjusts film 4 and includes the first smooth output layer and the first smooth input layer.First smooth output layer includes the first substrate 41 being combined with transparent body and the right-angle prismatic post micro structure 411 being arranged in the first substrate 41.First smooth input layer includes the second substrate 42 and is arranged on the convex lens micro structure 421 in the second substrate 42.First right-angle surface 4111 of right-angle prismatic post micro structure 411 and the laminating of the first smooth input layer.
In second substrate 42 of the first smooth input layer, including two the convex lens layers being equipped with multiple convex lens micro structure 421.Two convex lens layers be arranged in parallel along the thickness direction of the second substrate so that they height in the second substrate are different.Convex lens micro structure 421 can regular be distributed at convex lens layer, it is also possible to random distribution, but it must be ensured that each convex lens micro structure 421 is the most overlapping in height (or thickness) direction of the second substrate.Wherein, convex lens micro structure 421 can be planoconvex lens micro structure, and its crowning is towards light-emitting tube 3.The axis of convex lens micro structure 421 is perpendicular to the first right-angle surface 4111 so that the light that part light-emitting tube 3 sends is adjusted to be parallel to the light of the axis of convex lens micro structure 421 after convex lens micro structure, vertically injects right-angle prismatic post micro structure 411.Further according to inclined-plane and the angle of the first smooth output layer of law of refraction appropriate design right-angle prismatic post micro structure 411, transparent body is entered through the first smooth output layer through enabling to the light vertically injecting right-angle prismatic post micro structure, and in transparent body, form total internal reflection, arrive the other end of transparent body.
And the emergent light being installed on the transparent body other end adjusts film 5 and includes: the second smooth input layer 51 being combined with transparent body 1 and the second smooth output layer 52 being combined with the second smooth input layer 51.Second smooth input layer 51 includes the first optical input surface 511 being combined with transparent body 1 and the first light gasing surface 512 being combined with the second smooth output layer 52, and the second smooth output layer 52 includes and second smooth input layer 51(that is first light gasing surface 513) the second optical input surface 521 and the second light gasing surface 522 of combining.
Second smooth input layer 51 uses optical cement to fit tightly with transparent body, second smooth input layer 51 is more than or equal to the material of transparent panel preferably with refractive index, according to law of refraction appropriate design the first light gasing surface 511 and the angle of the first optical input surface 511, and second light gasing surface 522 and the angle of the first optical input surface 511, so that reach the second smooth output layer 52 at least partially in the light forming total internal reflection in transparent body through the first light gasing surface 512, and export emergent light through the second light gasing surface 522 further and adjust film 5, and received by light receiving tube and detect.
The form parameter of the convex lens micro structure 421 on convex lens layer can have Mutiple Choice to obtain the convex lens micro structure with different focal, it is possible to the light that correspondence injects convex lens layer with different angles is converted into directional light.Such as, convex lens micro structure 421 can have different center thicknesses or different diameter or have different center thicknesses and diameter simultaneously.The arrangement mode of the convex lens micro structure of the variously-shaped parameter of appropriate design, can reach to increase the light intensity vertically being injected right angle trigonometry prism microstructures by convex lens layer.
For light-emitting tube is arranged on the touching device adjusting center membrane position corresponding to incident illumination, in same convex lens layer, the center thickness of the convex lens micro structure being in marginal position is less than the center thickness of the convex lens micro structure being in center;Or in same convex lens layer, the diameter of the convex lens micro structure being in marginal position is less than the diameter of the convex lens micro structure being in center;Or in same convex lens layer, the center thickness of the convex lens micro structure being in marginal position is less than the center thickness of the convex lens micro structure being in center, meanwhile, the diameter of the convex lens micro structure being in marginal position is less than the diameter of the convex lens micro structure being in center.While the error in mounting position of light-emitting tube can being had bigger fault-tolerance ensureing touching device, in improving transparent body, form the light intensity of internal reflection.
First substrate 41 and the second substrate 42 can use identical material, to simplify the processing technology of incident illumination adjustment film.The inwall of the end face being perpendicular to transparent body of the second substrate 42 is provided with reflectance coating as reflecting surface 422, can improve the light intensity being irradiated in convex lens micro structure and being converted to directional light.
Although being described in conjunction with the accompanying embodiments of the present invention, but those of ordinary skill in the art can make various deformation or amendment within the scope of the appended claims.