CN202120238U - Optical touch device - Google Patents

Abstract

The utility model provides an optical touch device, which relates to the field of image processing. The prior art has the disadvantages of being large in size, high in cost and complicated in focal length setting of an optical sensing module. Therefore, the technical scheme is that three edges of a touch piece base plate are provided with regression reflection type reflective stripes, and two top angle sides of the other edge are respectively provided with an infrared laser head and a luminance sensor. A rotating mechanical device is provided with a mirror for reflecting a whole displaying area, responsive movements of all parts are controlled by a control circuit, and the luminance sensor and the infrared laser head work synchronously. The optical touch device has the advantages of being simple in structure and low in cost and can support touch devices with larger sizes.

Description

A kind of optical touch-control device

Technical field

The utility model relates to image processing field, especially contactor control device.

Background technology

Along with the development of optical sensor and corresponding picture processing chip, optical touch technical development at present is extremely rapid, and a kind of typical optical touch control apparatus is as scheming: shown in 1,2:

This device is made up of following structure:

1, optical sensor module;

2, control circuit;

3, light source changes reflecting strips and constitutes by being positioned near the optical sensor module infraluminescence parts and retroreflecting formula;

4, touch base plate, a touch face is provided, be optional composition;

When the user touches base plate, touch the light path that object has blocked light source, thereby on the optical sensor module, produced a relatively black image, the image that obtains from two optical sensor modules can calculate touch coordinate together.

In this device; The optical sensor module is made up of optical sensor and corresponding camera lens; Optical sensor needs to provide per second 50 frames (if reach better user experience; Need the above shooting speed of per second 100 frames) above image taking speed, and row resolution need reach and surpasses 500 pixels during imaging; Camera lens needs can provide greater than 90 ° of horizontal view angles, sizable depth of field, very little distortion.These reasons cause present device to reach preferably if desired, and effect has following several shortcoming:

1) technical difficulty of optical sensor module is higher, so cost is very high;

2) the optical sensor module is difficult to accomplish little size;

3) for the large scale touch-screen, because this optical sensor module need reach the picture that can both produce certain sharpness very nearby at far place, therefore for large scale screen, the focal length more complicated of regulating the optical sensor module.

The utility model content

The purpose of the utility model is that a kind of the simple in structure of above-mentioned drawback that overcome is provided, and the more optical touch-control device of large scale support can be provided.

The technical scheme that realizes above-mentioned utility model purpose is following:

The utlity model has the touch base plate, infrared laser head, luminance sensor; Retroreflecting formula reflecting strips; Control circuit is equipped with luminance sensor and infrared laser head respectively in touch base plate two adjacent drift angle sides, has rotatable mechanical hook-up in the infrared laser head outside; The catoptron of strafing whole touch area is housed on rotatable mechanical hook-up, on itself and adjacent touch base plate side, the retroreflecting reflecting strips is housed.

Back and forth rotation angle is enough big about rotatable mechanical hook-up, makes infrared laser can cover whole touch area.

Rotatable mechanical hook-up is with＞50Hz frequency side-to-side movement or make equidirectional circumference with the frequency of＞50 circle/seconds and rotatablely move.

Luminance sensor is synchronoused working with the infrared laser head.

Control circuit is connected with main frame, and on main frame, embedding has optical profile type touching device software.

Like above-mentioned technical scheme, the main building block of the utility model is described further.

1) rotatable mechanical hook-up, a catoptron is driven with back and forth rotation about the scope work that can cover whole touch area by rotatable mechanical hook-up, and this mechanical hook-up is controlled its angle by control circuit.This mechanical hook-up also can be done unidirectional circumference with the frequency that surpassed for 50 circle/seconds and rotatablely move to surpass the frequency side-to-side movement of 50Hz.

2) catoptron, infrared laser head and luminance sensor are strafed whole viewing area through the catoptron of a rotation.

3) infrared laser head; The infrared laser head can be launched infrared laser with the mode or the continuous mode of pulse; Illuminate retroreflecting formula reflecting strips through catoptron; Light path is blocked when shining opaque touch object, because this laser only need illuminate a point, therefore can be operated under the extremely low power.

4) luminance sensor; Luminance sensor is synchronoused working with infrared laser, responds to the brightness value on the current direction, because each moment luminance sensor only need be responded to the brightness of current direction; Therefore need not complicated optical lens, the resolution that reaches 8 bits is just enough.

5) control circuit; Control circuit is controlled rotatable mechanical hook-up; Confirm the steering angle of current time mechanical hook-up, and the control infrared laser, the monochrome information that luminance sensor returns need be received simultaneously; The monochrome information that computing unit on the last control circuit needs the diverse location of the rotatable mechanical hook-up of comprehensive both sides to return calculates whether the coordinate that touches object and touch object is arranged; The result who calculates need return to main frame with information through the interconnection line with main frame, and carries out corresponding action by operating system on the main frame or application software.

6) retroreflecting formula reflecting strips when not touching object on light path the time, returns the light of infrared laser irradiation to luminance sensor

7) touch base plate, the interface that provides the user to touch makes the action that touches can really obtain the feedback of a touching.

The utlity model has following beneficial effect:

1) can support bigger size, because infrared laser only need illuminate a point, the power that therefore improves infrared laser slightly just can provide larger sized support;

2) optical texture is simple, need not optical lens basically;

3) cost is low, and is lower to the requirement of each device.

Description of drawings

Fig. 1 is the optical touch control schematic diagram of prior art;

Fig. 2 is the apparatus structure synoptic diagram of Fig. 1;

Fig. 3 is a kind of optical touch-control device structural representation of the utility model.

The name of a label is called among the figure:

1---touches base plate 2---retroreflecting formula reflecting strips 3---optical sensor module

4---control circuit 5---infraluminescence parts

6---infrared light 7 that sends and be reflected---optical sensor module visual field＞90 °

8---rotating machinery device 9---luminance sensor 10---infrared laser heads

11---touching object 12---catoptron

Embodiment

Existing with the following example and combine accompanying drawing that the technical scheme of the utility model is described further.

Three neighboring edges touching base plate 1 are equipped with retroreflecting formula reflecting strips 2, in two drift angle sides of another side luminance sensor 9 and infrared laser head 10 are housed, and have rotating machinery device 8 in the infrared laser head outside; Left rotation and right rotation angle＞45 °; The catoptron 12 in the whole zone of scanning is housed on the rotating machinery device, and the rotating machinery device drives catoptron and moves together, and the rotating machinery device is with the side-to-side movement of＞50 ° of Hz frequencies; Sensor and infrared laser head synchronous working twice; The work of above-mentioned parts has main frame by control circuit 4 controls in the control circuit, on main frame, embed optical touch-control device software.

Claims (5)

1. an optical touch-control device has the touch base plate, the infrared laser head; Luminance sensor, retroreflecting formula reflecting strips, control circuit; It is characterized by in touch base plate two adjacent drift angle sides luminance sensor and infrared laser head are housed respectively; Have rotatable mechanical hook-up in the infrared laser head outside, the catoptron of strafing whole viewing area is housed on rotatable mechanical hook-up, on itself and touch base plate side adjacent to each other, retroreflecting formula reflecting strips is housed.

2. optical touch-control device according to claim 1, it is characterized by rotatable mechanical hook-up have can make infrared laser cover whole touch area about reciprocal rotation angle.

3. optical touch-control device according to claim 2, it is characterized by rotatable mechanical hook-up with the frequency left-right rotation of 50Hz or with the frequencies of 50 circle/seconds makes equidirectional circumference and rotatablely moves.

4. optical touch-control device according to claim 1 is characterized by luminance sensor and synchronouss working with the infrared laser head.

5. according to its described optical touch-control device of claim 1, it is characterized by control circuit and be connected with main frame.

Images