A SCAN HEAD'S AIMING BEAM EXPOSURE SOLUTION SYSTEM

Abstract

The invention discloses a scan head's aiming beam exposure solution system, comprising the control circuit of aiming lamp. The control circuit is composed of 5 pin terminals, wherein pin 1 and 2 are the input terminal of gate circuit, and pin 4 is the output terminal of NOT gate circuit; the high level Vcc is connected with pin 5 of the control circuit, and pin 3 of the control circuit is grounded; the pin 1 and 2 are connected with the scanning signal and the field sync signal respectively, and resistor R1 is connected with the field sync signal and is grounded. The solution system, compared with the existing scan heads on the market, can completely solve the local overexposure problem of the aiming beam, hugely improve the decoding accuracy, stability, identification rate, decoding speed and power consumption of the scan head hugely, and realize cost-effectiveness easily.

Claims

1. A scan head's aiming beam exposure solution system, comprising the control circuit of the aiming lamp (1), is characterized in that: the control circuit (1) of the aiming lamp is composed of 5 pins, wherein the pin 1 and 2 are the input terminal of the gate circuit, and the pin 4 is the output terminal of the NOT gate circuit, the pin 5 of the control circuit (1) is connected with the high level Vcc, and the pin 3 of the control circuit (1) is grounded; the pin 1 and 2 of the control circuit (1) are connected with the scanning signal and the field sync signal respectively, the field sync signal is connected with the resistor R1 and is grounded thereof; the pin 4 of the control circuit (1) is connected with the grid electrode of the field effect transistor (Q1); the drain electrode of the field effect transistor (Q1) is connected with the high level Vcc; the source electrode of the field effect transistor (Q1) is connected with the resistor R2 and the light- emitting diode D1 respectively, and is grounded thereof.

2. A scan head's aiming beam exposure solution system according to the claim 1 is characterized in that: the field effect transistor (Q1) is an N-type MOS tube.

3. A scan head's aiming beam exposure solution system according to the claim 1 is characterized in that: the control circuit (1) is a U1 controller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 Sequence Diagram of Field Sync Signal of the Invention; and

[0011] FIG. 2 Control Circuit Diagram of Aiming Lamp of the Invention wherein: 1control circuit, Q1field effect transistor, D1light emitting diode, D2diode.

EMBODIMENTS OF THE INVENTION

[0012] In line with the drawings in the embodiment of the invention, the technical proposal of the invention embodiment is described clearly and completely. Obviously, the embodiment to be described herein is only a part of the embodiments of the invention, and is not the entire embodiment of the invention. Based on the embodiment of the invention, all the other embodiments that are obtained by those of ordinary skills in the art without making creative labor shall be under the protection of the invention.

[0013] According to the FIG. 1-2, in the embodiment of the invention, a scan head's aiming beam exposure solution system, comprises the control circuit1 of the aiming lamp, which is composed of 5 pins, the control circuit 1 is a U1 controller, wherein the pin 1 and 2 are the input terminal of the gate circuit, and the pin 4 is the output terminal of the NOT gate circuit, the pin 5 of the control circuit 1 is connected with the high level Vcc, and the pin 3 of the control circuit 1 is grounded; the pin 1 and 2 of the control circuit 1 are connected with the scanning signal and the field sync signal respectively, the field sync signal is connected with the resistor R1 and is grounded thereof, and thereby the scan signal (SCAN_ENABLE) and the field sync signal (vsync) serve as the input terminal of the gate circuit, and the output terminal serve as the control signal of the aiming lamp; the pin 4 of the control circuit 1 is connected with the grid electrode of the field effect transistor Q1, whereas the field effect transistor Q1 is a N-type MOS tube; the drain electrode of the field effect transistor Q1 is connected with the high level Vcc, and the source electrode of the field effect transistor Q1 is connected with the resistor R2 and the light-emitting diode D1 respectively, and is grounded thereof.

[0014] To sum up, the local overexposure problem caused by the aiming beam can be perfectly solved. The invention makes use of the camera to drive and output the field sync signal (vsync), whereof the field sync signal is input to the control circuit 1, and the control circuit 1 separates the start point and the end point of the blanking time of the field sync signal, where the start point serves as the start signal of the aiming lamp, and the end point serves as the closing signal. The decoding process of the camera completes within the time of the effective picture zone of the field sync signal; if so, the decoding time of the camera and the lightening time of the aiming lamp are completely separated to avoid the local overexposure caused by aiming beam.

[0015] To those of skill in the art, the invention is not only limited to the details of the demonstrative embodiment aforesaid, moreover the invention can be realized in other special forms without deviating from the spirit or the basic characteristics of the invention herein. Therefore for every point, the embodiment aforesaid should be deemed as demonstrative and non-restrictive. The scope of the invention is limited by the claims, instead of the aforesaid description; therefore all changes to the meaning and scope of the equivalent element of the claims are covered by the invention. Instead, any other figures, drawings and marks in the claims should not be deemed as the ones to limit or restrict the related claims thereof.

[0016] Additionally, it is required to recognize that, the specification makes description according to the embodiment, but it is not every embodiment that contains an independent technical proposal, and the narration mode of the specification are for clarification purpose only; therefore those of skill in the art should deem the specification as an entirety; the technical proposals of every embodiment can be combined as appropriate so as to form other embodiments that are recognizable to those of skill in the art.