JPS6265013A - Light emitting element - Google Patents

Abstract

PURPOSE:To irradiate a laser beam of a high output to one point by varying, at every collimating lens, a distance between a light emitting point of each light source and an optical axis of the collimating lens corresponding to each light source. CONSTITUTION:Plural semiconductor laser light sources 2a-2e are arranged in a semiconductor laser array 1. From each semiconductor laser 2a-2e of this array 1, divergent laser beams La-Le are emitted, and led to a collimating lens array 3. As for some specified collimating lens 4c, a light emitting point 2c' of the corresponding light source 2 is positioned on its optical axis 4c', and also by varying a distance between optical axes 4a', 4b', 4d' and 4e' of collimating lenses and light emitting points 2a', 2b', 2d' and 2e' of the light sources 2a, 2b, 2d and 2e corresponding to them, in accordance with shifting to adjacent collimating lenses 4a, 4b, 4d and 4e, based on said specified collimating lens 4c as a reference, the laser beams La-Le which have passed through each collimating lens 4a, 4b, 4d and 4e are all condensed to one point.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to optical discs, compact discs,
The present invention relates to light emitting elements applied to video discs, laser printers, etc.

[Technical background of the invention and its problems]

Recently, in the process of developing high-power semiconductor lasers, semiconductor laser arrays consisting of a plurality of semiconductor lasers have been developed.

However, since this semiconductor laser array has a plurality of light emitting points, it has a drawback that when the emitted laser light is focused by one lens, the laser light is not focused at one point.

[Purpose of the invention]

The present invention was made based on the above circumstances, and its purpose is to make it possible to irradiate a high-power laser beam onto a single point by focusing the emitted light onto a single point using a single lens. An object of the present invention is to provide a light-emitting device.

[Summary of the invention]

In order to achieve the above object, the present invention provides a light source array formed by arranging a plurality of light sources, and a collimating lens array formed by arranging a plurality of collimating lenses so as to correspond to each light source of the light source array. A light-emitting element comprising: a light-emitting element, in which the distance between the light-emitting point of each of the light sources and the optical axis of the collimating lens corresponding to each of the light sources is changed for each collimating lens, so that all the light that has passed through each collimating lens is focused on one point. It is characterized by condensing light.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a phase-locked semiconductor laser array (light source array), and this semiconductor laser array 1 has a configuration in which a number of stages of semiconductor lasers (light sources) 2a to 2e are arranged. Each of the semiconductor lasers 2a to 2e of this semiconductor laser array 1 emits diverging laser beams La-L.
e is emitted and guided to the collimating lens array 3.

゛This collimating lens array 3 includes a plurality of collimating lenses 4 such as spherical lenses so as to correspond to each of the semiconductor lasers 2a to 2e of the semiconductor laser array 1.
It has a configuration in which a to 4e are arranged.

Here, for a certain collimating lens 4C,
On the optical axis 4C'', the light emitting point 2C'' of the corresponding light source 2C
is located and this particular collimating lens 4
Adjacent collimating lenses 4a, 4b, 4 with C as a reference
d and 4e, the collimating lens 4a is
, 4b, 4d.

From the optical axes 4a-, 4b-, 4d-, 4e'' of 4e, the light emitting points 2a'' of the light sources 2a, 2b, 2d, 2e corresponding to these
, 2b-, 2d-, and 2e', all of the laser beams La-Le that have passed through the collimating lenses 4a, 4b, 4d, and 4e are condensed to one point. Note that a lens 5 for converting the laser beams La-Le into a parallel beam is arranged behind this condensing point.

According to the above configuration, even if there are a plurality of light emitting points 2a to 2e', the laser beams La to Le can be focused on one point by one lens 6. Therefore, a high-output laser beam can be focused on one point.

Note that the lens 5 does not necessarily need to be provided.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a light source array in which a plurality of light sources are arranged, and a collimating lens array in which a plurality of collimating lenses are arranged in correspondence with each light source in the light source array. The distance between the light emitting point of each of the light sources and the optical axis of the collimating lens corresponding to each of the light sources is changed for each collimating lens so that all the light passing through each collimating lens is focused on one point. Because of this, the emitted light can be focused on a single point with a single lens, resulting in excellent effects such as being able to irradiate a single point with a very high-power laser beam.

[Brief explanation of drawings]

The drawing is a configuration diagram showing an embodiment of the present invention. 1... Light source array (semiconductor laser array), 2a~
2e...Light source (semiconductor laser), 2a''~2e'・
... Light emitting point, 3 ... Frimate lens array, 4a ~
4e... Collimating lens, 4a- to 4e-... Optical axis.

Claims (1)

[Claims] The light source array includes a light source array in which a plurality of light sources are arranged, and a collimating lens array in which a plurality of collimating lenses are arranged so as to correspond to each light source in the light source array. A light emitting element characterized in that the distance between a collimating lens and an optical axis corresponding to each light source is changed for each collimating lens.