JPS61194789A - Light-emitting device and supporter incorporated into said device - Google Patents

Abstract

PURPOSE:To improve genera-purpose properties by forming a light-emitting source by three laser chips and a supporter on which the laser chips are fixed, each bringing near and fastening several laser chip to three stepped surfaces on the main surface of the supporter and constituting a laser array. CONSTITUTION:A supporter 13 on which radiators are fixed in a package 12 consists of the rectangle of copper, silicon, silicon carbide, etc., and laser chips 15 are each fastened onto light-emitting element fitting surfaces 14 in three surfaces as several stepped surface in the supporter 13 so that beams having the same wavelength are emitted in the same direction. These laser chips 15 are settled to the light-emitting element fitting surfaces 14 so as to be brought near. Consequently, a laser array in which light-emitting sources are positioned at regular intervals on a straight line is constituted, and laser beams 3 in three bundles projected from the laser chips 15 are projected separately to respective dot 9, 10, 11 in A, B and C when laser beams 3 in three bundles are diaphragmed to a drum surface in a photosensitive drum 8. When the light- emitting device is used as a light-emitting source for a laser beam printer, multi-color printing by the laser beam printer is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a light emitting device and a support incorporated in the device.

[Background technology]

Light source for optical communication, digital audio disc, video disc, laser beam printer, etc.
orld) J October 1984 issue, September 1, 1984
Published on the 5th, P59-P66, or published by Nikkei McGraw-Hill [Nikkei Electronics J November 19, 1984]
Various semiconductor laser devices have been developed as described in pages 187 to 206. Furthermore, as shown in the above-mentioned literature, these semiconductor laser devices (also referred to as laser chips) have a plurality of waveguides each emitting laser light of a different wavelength as a light source of a wavelength multiplexing transmission system. Distributed feedback laser chips and phase-locked laser arrays with multiple waveguides designed to increase output have been developed.

The present invention was also developed to cope with the expanding use of semiconductor lasers, and can be used not only as a light source for wavelength division multiplexing transmission systems, but also as a light source for information processing such as video discs and laser beam printers. It is a light emitting device with excellent versatility.

[Purpose of the invention]

An object of the present invention is to provide a light emitting device that emits a plurality of lights.

Another object of the present invention is to provide a light emitting device having a plurality of light emitting elements having different light emitting positions.

Another object of the present invention is to provide a light emitting device that emits light of different emission wavelengths.

The above and other objects and novel features of the present invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Summary of the invention]

A brief overview of typical inventions disclosed in this application is as follows.

That is, when the light emitting device of the present invention is used as a light source for a multicolor laser beam printer, the light emitting device serving as the light emitting source is composed of three laser chips and a support body to which these laser chips are fixed, and each of the laser chips is The chip is fixed close to each of the three step surfaces on the main surface of the support,
Since the laser array is configured, when the laser light emitted from each laser chip is irradiated onto the photosensitive surface of the laser beam printer by the optical system, the laser light emitted from each laser chip produces a color image of the photosensitive surface. 3 that constitutes
Since each dot of the primary color is hit, a desired hue is formed on the photosensitive surface, making multicolor printing possible.

〔Example〕

FIG. 1 is a perspective view showing an outline of a light emitting device according to an embodiment of the present invention, FIG. 2 is a schematic view showing an example in which the light emitting device of the present invention is applied to a multicolor laser beam printer, and FIG. It is a partially enlarged schematic diagram.

This embodiment shows an example in which a light emitting device according to the present invention is used as a light emitting source of a laser beam printer for multicolor printing.

That is, as shown in FIG. 2, the laser light 3 emitted from the window 2 of the semiconductor laser device 1, which is a light emitting device, is
Combined lens 4. Beam shaping optical system 51 rotating polygon mirror 6.
The photosensitive drum 8 is
is guided and irradiated onto the photosensitive surface. Laser light 3 is transmitted to semiconductor laser device 1. Combined lens 4. Although one beam is shown in the beam shaping optical system 59 in the region leading to the rotating polygon mirror 6, there are actually three beams in the region extending from the rotating polygon mirror 6 to the Fθ lens 7 and the photosensitive drum 8.

Further, the rotating polygon mirror 6 and the Fθ lens 7 constitute a scanning optical system, and scan the laser beam 3 in the direction of the generatrix of the photosensitive drum 8. produce the desired image on the surface. That is, the three laser beams 3 are each red, as shown in the schematic diagram of FIG.

Each of the three primary colors A-B-C dots 9°10 consisting of green and blue
．． 11 are irradiated separately.

As a result, a desired colored pattern appears on the drum surface of the photosensitive drum 8, making it possible to print in multiple colors using a laser beam printer.

Here, the light emitting section housed in the package 12 of the semiconductor laser device 1 will be explained with reference to FIG.

A support 13 is fixed to a heat radiator (not shown) inside the package 12 . This support body 13 is made of a rectangular body made of copper, silicon, silicon carbide, etc., and its main surface is stepped. A laser chip 15 is fixed to each of the three light emitting element mounting surfaces 14 serving as each step surface. These laser chips 15 are fixed to the light emitting element mounting surface 14 so as to emit light of the same wavelength in the same direction. Further, these laser chips 15 are fixed to the light emitting element mounting surface 14 so as to be close to each other. That is, since the width of the laser chip 15 is about 350 to 400 μm, the pitch b between adjacent laser chips 15 is slightly larger than the width of the laser chip 15. Further, the pitch a in the height direction of each laser chip 15 can be determined by the step difference in the support body 130 and the light emitting element mounting surface 14.
For example, it is several hundred μm.

Therefore, in this example, the light emitting sources constitute a laser array located at regular intervals on a straight line. Therefore, when the three bundles of laser beams 3 emitted from these laser chips 15 are focused on the drum surface of the photosensitive drum 8, as shown in FIG. B,
Each dot of C is irradiated at 9°10.11. Note that 1G in FIG. 1 is a wire connected to the upper electrode of the laser chip 15.

〔effect〕

(11) Since the light emitting device of the present invention can emit three laser beams 3 from close positions, it can be used as a laser array.

(2) According to the present invention, when the light emitting device of the present invention is used as a light emitting source of a laser beam printer, it is possible to achieve multicolor printing using the laser beam printer.

(3) Since the support according to the present invention has a stepped shape, a laser array can be easily manufactured by simply fixing the laser chip 15 to each of these stepped surfaces. This effect can be obtained.

(4) According to the above fl) to (3), according to the present invention, there is no need for a large amount of new equipment when manufacturing a laser array, and only a slight modification of the current semiconductor manufacturing process is required. Since it can be manufactured and existing equipment can be shared, a synergistic effect can be obtained in that production costs can be kept low.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. For example, by increasing the number of stepped surfaces on the support, it is possible to further expand the range of uses as a laser array.

Further, the emission wavelengths of the laser chips fixed to the support body do not necessarily have to be the same, and may have different emission wavelengths. Such a structure in which each laser chip has a different wavelength can be used, for example, as a transmitter side light source of a wavelength division multiplexing transmission system. In particular, the light-emitting device structure of the present invention does not require the selection of the material of the laser chip and can be freely selected, resulting in the effect that a wide range of wavelengths from visible light to long-wavelength light can be used for optical communication. It will be done.

Furthermore, the light emitting element mounting surface of the support in the present invention may be arranged irregularly in the height direction, as shown in FIG. This is more effective by matching the light receiving conditions of the device on the light receiving side.

Further, even if a light emitting diode is used as the light emitting element in the present invention, the same effects as in the above embodiments can be obtained.

[Application field]

The above explanation has mainly been about the application of the invention made by the present inventor to laser beam printers, which is the background field of application, but the invention is not limited thereto. It can be applied to general optoelectronic devices such as measurement technology and medical technology that emit light as a light source.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an outline of a light emitting device according to an embodiment of the present invention, FIG. 2 is a schematic view showing an example in which the light emitting device of the present invention is applied to a multicolor laser beam printer, and FIG. Partially enlarged schematic diagram, FIG. 4 is a schematic diagram showing a light emitting device according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Semiconductor laser device, 2... Window, 3... Laser light, 4... Coupling lens, 5... Beam shaping optical system, 6... Rotating polygon mirror, 7... Fθ Lens, 8...
・Photosensitive drum, 9. 10. 11...dot, 12
... Package, 13... Support body, 14... Light emitting element mounting surface, 15... Laser chip, I6... Wire. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A support body having a plurality of light emitting element mounting surfaces on its main surface, and a light emitting element fixed to each light emitting element mounting surface of this support body;
A light emitting device comprising: 2. The light emitting device according to claim 1, wherein each of the light emitting element mounting surfaces has a stepped shape. 3. The light emitting device according to claim 1, wherein each of the light emitting elements is fixed on a support so that the light emitted from each light emitting element travels in the same direction. 4. The light emitting device according to claim 1, wherein at least one of the light emitting elements has a different emission wavelength from other light emitting elements. 5. A support to which a plurality of light emitting elements are fixed, wherein each part of the main surface of the support to which the light emitting elements are fixed has a step. 6. The support according to claim 5, wherein the main surface of the support has a stepped shape.