Optical printing head and its usage

Abstract

The present invention is one optical printing head and its usage. The optical printing head has matrix form condensing micro lens combination set between its LED plate and the matrix form self-focusing micro lens combination to converge the light from the LED plate to the matrix form self-focusing micro lens combination to raise the light strength to the matrix form self-focusing micro lens combination and raise the photocoupling efficiency.

Description

technical field [0001] The present invention relates to an optical printing head and its usage method, especially an optical printing head with high optical coupling efficiency and its usage method. Background technique [0002] Generally, the optical print head that uses a diode light-emitting board as a light source, because its optical coupling efficiency is not high, so it is necessary to increase the driving current to make the diode light-emitting board generate higher energy irradiation light, and the diode light-emitting board needs about 5 The operating current is about 20A (depending on the design of the drive circuit), so after a period of continuous operation, the problem of overheating will occur. [0003] Please refer to Figure 1A , which is a schematic diagram of light rays traveling in the prior art optical printing head, and the upper figure in the figure is a front schematic view of the single-row self-focusing microlens group 20, here, along the A-A' of t...

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Problems solved by technology

[0002] Generally, the optical print head that uses a diode light-emitting board as a light source, because its optical coupling efficiency is not high, so it is necessary to increase the driving current to make the diode light-emitting board generate higher energy irradiation light, and the diode light-emitting board needs about 5 ~20A (depending on the design of the drive circuit) working current, so after a period of continuous work, there will be a problem of overheating

[0003] Please refer to Figure 1A , which is a schematic diagram of light rays traveling in the prior art optical printing head, and the upper figure in the figure is a front schematic view of the single-row self-focusing microlens group 20, here, along the A-A' of the single-row self-focusing microlens group 20 The section of the line segment is illustrated by the lower figure in the figure. When the light emitting diode 10a generates the irradiating light 17, the irradiating light 17 scatters part of the irradiating light 17 to areas other than the self-focusing microlens 20a as the distance increases. Therefore, Only part of the irradiating light 17 enters the self-focusing microlens 20a, such a process will cause the light coupling efficiency to decrease, and the light coupling efficiency of some designs is even only 0.4217%. After the focusing microlens 20a, the receiving end only receives 0.004217mw of light source energy, it can be seen that the optical coupling efficiency of the general optical print head is very poor

[0004] So in order to improve the optical coupling efficiency, such as Figure 1B As shown, the upper figure in the figure is the front schematic view of the dual-row self-focusing microlens group 21, here the section along the BB' line segment of the dual-row self-focusing microlens group 21 and the lower figure in the figure As an illustration, some designs use a dual-row self-focusing microlens group 21, that is, use two self-focusing microlenses 21a arranged in parallel up and down to increase the optical coupling area, so that the irradiating light 17 can all enter the self-focusing microlens. In the lens 21a, in order to improve the light coupling efficiency, although this method can improve the light coupling efficiency, the production cost of the dual-row self-focusing micro-lens group 21 is relatively high, and another way is to increase the light-emitting diode 10a drive current to allow the light emitting diode 10a to produce higher power light source energy, but this way can improve the light coupling efficiency, but while increasing the drive current, the temperature of the light emitting diode 10a will also rise (that is, the above-mentioned temperature Excessively high problem), get down for a long time, will shorten the service life of light-emitting diode 10a

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