CN201303205Y

CN201303205Y - Laser diode device

Info

Publication number: CN201303205Y
Application number: CNU2008201400694U
Authority: CN
Inventors: 欧思村; 严宪政
Original assignee: HUAXIN OPTOELECTRONICS TECHNOLOGY Inc
Current assignee: HUAXIN OPTOELECTRONICS TECHNOLOGY Inc; Arima Lasers Corp
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2009-09-02
Anticipated expiration: 2018-10-22

Abstract

An laser diode device comprises a radiating seat with a plurality of supporting pins arranged on the back surface thereof, a fixed seat protruding on the surface of the radiating seat, a one-time fixed seat arranged on the fixed seat, an LD (laser diode) and PD (photo diode) chip arranged at prepositioned part above the radiating seat, and a metal sealing cover jointed above the radiating seat. An APC (automatic power control) circuit is directly and internally arranged and encapsulated in the metal sealing cover and electrically connected with predetermining pins and the LD and PD chip through routing, so that two pins of the encapsulated laser diode device are a positive power connecting terminal and a negative power connecting terminal, and the third pin thereof can be connected with an external variable resistor. The utility model enables an assembly shop to eliminate the trouble in adding circuits, simplifies the device design, improves the using convenience and the production efficiency, and achieves the effect of more convenient use.

Description

Laser diode device

Technical field

The utility model relates to a kind of laser diode, relates in particular to a kind of automatic power control circuitry directly to be made radiating seat in metal cover or the laser diode device on the inferior holder.

Background technology

Laser semiconductor is a kind of of diode, is also referred to as laser diode (Laser Diode).Do not exist together with general diode, be that it possesses the function that laser oscillator is arranged.So, possess the optical property of all emission laser of electrical properties that general diode is arranged and laser oscillator.General laser oscillator just causes the object (medium) of laser action, wherein has solid, gas, liquid to also have semiconductor.The ruby laser of finding the laser generation action in the world the earliest is the representative of Solid State Laser, and the representative of gas laser has the helium neon laser that produces red light, and the representative of liquid laser has pigment laser.These laser generators are the above large volume device of tens of cm, need tens of watts or above electric power in order to make laser generation.On the other hand, laser semiconductor is because belong to diode, so its big small size is about 1mm ³Below.The direct current of tens of mA flows to only allowing as if the suitable folk prescription at its diode, just can simply obtain the light of 10mW level, so, can be assembled in easily in the little device, such as it generally is used in CD and optical communication equipment.No matter either side all is to utilize the light source of laser semiconductor to bring into play its feature, and become the key element of each application.

Secondly, as shown in Figure 1, the structural map of existing a kind of visible laser diode device, restriction in view of prior art, traditional laser diode 11 is earlier laser diode chip (chip) to be positioned over radiating seat 111, then for preventing that exposed die is subjected to extraneous the damage, and must be again with metal cover (cap) 112 encapsulation, and utilize the low-down dry gas filling of dew point, making the diameter of laser diode 11 encapsulating structures of last moulding is 5.6mm; And the pin 113 of three terminals or four terminals is stretched out in radiating seat 111 bottoms.

Yet this laser diode 11 need utilize its pin 113 to be connected with circuit external plate 12 again, and then with elements combination such as holder 13, lid 14 and spring 15, and constitute a laser focusing structure 10.

The laser diode 11 of aforementioned existing laser focusing structure 10 is to borrow 12 supplies of circuit external plate required drive current.But the shortcoming of this kind device is, the producer of laser focusing structure 10 needs additional circuit plate 12 voluntarily again after buying laser diode 11 to semiconductor manufacturer, not only increase the inconvenience of processing procedure, and need be dependent on the action of artificial adjustment light output, and then influence production efficiency.

Moreover the circuit board 12 that adds increases the volume of laser focusing structure 19 on foot, must be greatly to more than the 9mm, owing to volume can't dwindle, so can't be applied on the less specialities of some volumes.

The utility model content

In order to overcome the above-mentioned defective that prior art exists, the utility model provides a kind of laser diode device, and it can make and make up the trouble that factory saves additional circuit, and the simplification device design, promotes ease of use and production efficiency, and reaches use effect more easily.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of laser diode device, it includes: a radiating seat, the back side are provided with several branch connecting pins; One holder is convexly equipped with on the radiating seat surface; A holder is located on the aforementioned fixation seat; One LD and PD diode chip for backlight unit are located at radiating seat top book office; One metal cover is to be bonded on the radiating seat top; It is characterized in that: with automated power control APC circuit, direct built-in being encapsulated in the metal cover, and borrow routing to form and electrically connect with predetermined pin and LD, PD diode chip for backlight unit respectively, make the laser diode device of encapsulation, wherein 2 branch connecting pins are respectively positive and negative power connector end, and the 3rd pin is for being connected with an outside variable resistor.

Aforesaid laser diode device, wherein the LD diode chip for backlight unit is provided in a side of on time holder, and PD diode chip for backlight unit and APC circuit are independently to be located in the set groove in radiating seat surface.

Aforesaid laser diode device, wherein the APC circuit is to be set as IC mode.

Aforesaid laser diode device, wherein the LD diode chip for backlight unit is provided in a side of on time holder, and PD diode chip for backlight unit and APC circuit board combine, and are located in the groove on radiating seat surface.

Aforesaid laser diode device, wherein LD, PD diode chip for backlight unit and APC circuit three all are located on time holder.

The beneficial effects of the utility model are that it can make and make up the trouble that factory saves additional circuit, and the simplification device design, promotes ease of use and production efficiency, and reaches use effect more easily.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the exploded perspective schematic diagram of existing visible laser diode device.

Fig. 2 is the exploded perspective schematic diagram of the utility model one possible embodiments.

Fig. 3 be the utility model one possible embodiments partly cut open schematic perspective view.

Fig. 4 is the upward view of the utility model one possible embodiments.

Fig. 5 is a circuit diagram of the present utility model.

Fig. 6 is the cutaway view of the utility model one possible embodiments.

Fig. 7 is the cutaway view of another possible embodiments of the utility model.

Fig. 8 is the cutaway view of the another possible embodiments of the utility model.

The number in the figure explanation:

20 laser diode devices

21 radiating seats

211 grooves

22a, 22b, 22c pin

23 holders

No. 231 holders

24 LD diode chip for backlight unit

25 PD diode chip for backlight unit

26 APC circuit

27 metal covers

271 windowpanes

28 routings

29 variable resistors

Embodiment

At first, see also shown in Fig. 2,3,4, the disclosed laser diode device 20 of the utility model, the one possible embodiments includes:

One radiating seat (heat sink) 21, its back side are provided with the 1st pin 22a, the 2nd pin 22b and the 3rd pin 22c;

One holder (mount or stem) 23 is to be convexly equipped with on radiating seat 21 surfaces, and is connected with the 2nd pin 22b of ground connection GND;

A holder (submount) 231 is made of the monocrystalline silicon material, is located at holder 23 inboards, engages for LD diode chip for backlight unit 24;

One PD (Photo Diode) diode chip for backlight unit 25 is to be located on the radiating seat 21;

One metal cover (cap) 27, its end face possesses windowpane 271, and root edge is bonded on radiating seat 21 tops; Wherein

One APC circuit 26, be that automatic power control circuitry is made into circuit board or IC sample attitude, and built-in being encapsulated in the metal cover 27, utilize routing 28 and the 1st, 2,3

22a, 22b, 22c and LD diode chip for backlight unit 24, PD diode chip for backlight unit 25 to be connected, to form the voltage driven element of laser diode.

Please consult shown in Fig. 4,5, this APC circuit 26 can utilize existing diameter 5.6mm or less than the 5.6mm encapsulation, place it in laser diode inside again, and its new pin definition:

The 1:Vcc power supply+

The 2:GND power supply-

3: meet outside variable resistor VR 29

By above-mentioned technological means, the laser diode device 20 that the utility model is finished can make the related industry of using laser diode, saves the trouble that adds control circuit, and reduces the artificial action of adjusting light output, promotes production efficiency greatly; And the laser diode of its reason current drives becomes and can promote ease of use by the element of driven.Moreover simplification device design, but reduced volume when making the Related product utilization are so can be applicable on the little specialities of some volumes.

Form as for automated power control (APC) circuit is a lot, usually utilize the light dorsad (Back beam) of a PD diode chip for backlight unit monitoring LD, measure the size of its Output optical power, and control the bias current of LD with this, constitute one like this and bear go back to the lock ring road, reach the purpose of stablizing Output optical power.And APC principle and electronic component thereof are to belong to prior art, and the non-the utility model patent of its circuit content target is held and do not given unnecessary details.Of the present utility model being characterised in that is placed on APC 26 circuit in the laser diode, designs with simplification device.

Further, the utility model has several designs with the possible embodiments of building in the APC circuit in the laser diode, wherein embodiment illustrated in fig. 6 according to Fig. 2, cutaway view shown in Figure 3, PD diode chip for backlight unit 25 is located at a radiating seat 21 surfaces digs in the groove of establishing 211, and APC circuit 26 is to make into IC mode with placing groove 211.This kind configuration is the IC simplicity of design of APC, and can use existing PD diode chip for backlight unit, and can cooperate other materials to bind (SM), and need not make advantage such as welding (solder) back processing procedure.

Another kind of APC circuit arrangement schematic diagram shown in Figure 7, it is that PD diode chip for backlight unit 25 is combined with the circuit board of APC circuit 26 with putting at groove 211.Its also have can cooperate other materials SM and need not to do solder after the advantage of processing procedure.

Another APC circuit arrangement schematic diagram shown in Figure 8, it is that PD diode chip for backlight unit 25 and APC circuit 26 are directly arranged in time holder (Submount) 231, the Lop type that this APC+PD+SM constituted then has the advantage that material is simplified, encapsulation procedure simply reaches the plane formula routing.

More than three kinds of embodiment, all can reach the purpose that makes APC built-in, the built-in APC circuit 26 of the utility model can be considered according to product performance and demand, select suitable mode to be configured in the laser diode, and be packaged into a diameter 5.6mm or less than the device of 5.6mm, not only become and more can promote production efficiency and ease of use by the element of driven.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

In sum, the utility model is on structural design, use practicality and cost benefit, it is required to meet industry development fully, and the structure that is disclosed also is to have unprecedented innovation structure, have novelty, creativeness, practicality, the regulation that meets relevant novel patent requirement is so mention application in accordance with the law.

Claims

1. laser diode device, it includes:

One radiating seat, the back side are provided with several branch connecting pins;

One holder is convexly equipped with on the radiating seat surface;

A holder is located on the aforementioned fixation seat;

One LD and PD diode chip for backlight unit are located at radiating seat top book office; One metal cover is to be bonded on the radiating seat top;

It is characterized in that:

With automated power control APC circuit, direct built-in being encapsulated in the metal cover, and borrow routing to form and electrically connect with predetermined pin and LD, PD diode chip for backlight unit respectively, make the laser diode device of encapsulation, wherein 2 branch connecting pins are respectively positive and negative power connector end, and the 3rd pin is for being connected with an outside variable resistor.

2. laser diode device according to claim 1 is characterized in that: described LD diode chip for backlight unit is provided in a side of on time holder, and PD diode chip for backlight unit and APC circuit are independently to be located in the set groove in radiating seat surface.

3. laser diode device according to claim 2 is characterized in that: described APC circuit is to be set as IC mode.

4. laser diode device according to claim 1 is characterized in that: described LD diode chip for backlight unit is provided in a side of on time holder, and PD diode chip for backlight unit and APC circuit board combine, and are located in the groove on radiating seat surface.

5. laser diode device according to claim 1 is characterized in that: described LD, PD diode chip for backlight unit and APC circuit three all are located on time holder.