CN1300789C

CN1300789C - Application of the laser emission device on the optical drive

Info

Publication number: CN1300789C
Application number: CNB200410045297XA
Authority: CN
Inventors: 曹志强; 廖正尧
Original assignee: Lite On IT Corp
Current assignee: Lite On IT Corp
Priority date: 2004-06-04
Filing date: 2004-06-04
Publication date: 2007-02-14
Anticipated expiration: 2024-06-04
Also published as: CN1707653A

Abstract

The invention is a laser emission device, which is used between a CD driver and a CD, and the device comprises: a shell, which is arranged in the CD-ROM and is provided with a light transmission part; a laser emitting assembly fixed inside the casing and connected electrically to the CD driver to emit laser out of the light transmitting part; and a semiconductor substrate fixed in the shell and electrically connected to the CD-ROM, wherein the semiconductor substrate is provided with a light detection component and a temperature sensing component, the light detection component monitors the intensity of the laser emitted by the laser emitting component and converts the intensity of the laser into an electric signal for the CD-ROM to use, and the temperature sensing component generates a temperature change signal according to the change of the temperature in the shell for the reference of the CD-ROM.

Description

Use the laser beam emitting device on the CD-ROM drive

Technical field

The present invention is a kind of laser beam emitting device of using on the CD-ROM drive, refers to a kind of laser beam emitting device of using on the CD-ROM drive especially.

Background technology

See also Fig. 1 (a), it is the organigram of optical read/write head 1 in the cd-recorder, semiconductor laser module 11 sends laser, is radiated on the discs 2 after the refraction through lens 14 and object lens 15, and reflects back into optical read/write head 1 by photodetector 12 receptions through discs 2.When cd-recorder is write fashionable to discs 2, be on the burning material of discs 2, to inscribe mark with the laser that semiconductor laser module 11 sends the certain power scope, meaning promptly, the laser power of carrying out burning is the interval that a restriction is arranged, and too high or low excessively all causing easily writes bad even write activity failure.

And the discs 2 of unlike material also can need to adjust laser power, single burning discs or the cd-rewritable sheet also needs different laser powers, and general CD (CD) with diversified optical digital disk (DVD) but also possible factor causes according to density is different allows that the variance power scope is also different.And the laser power that semiconductor laser module 11 sends is very relevant with the electric power of input, and the laser power that the electric power increase of input is then sent increases thereupon, otherwise laser power will reduce when electric power reduced.So inserting according to different discs 2, cd-recorder now all need be with best power control (Optimum Power Control, be called for short OPC) carry out the recording power test, obtain the pairing input electric power of best laser recording power by this.

But except input electric power, the variation of working temperature also can influence the laser power that semiconductor laser module 11 is sent, because generally speaking, under identical input electric power condition, when temperature was higher or lower than an optimum working temperature scope, the laser power of semiconductor laser module 11 outputs will reduce.Therefore, best power control (the Optimum Power Control that before carrying out the burning action, is carried out, abbreviation OPC) after the test, though having obtained initial best semiconductor laser module 11 input electric powers, cd-recorder carries out formal data burning action, but flip-flop along with environment temperature, or semiconductor laser module 11 reads or the heat energy that produced in the transfer process because of electric energy/luminous energy during burning, and make the working temperature of semiconductor laser module 11 to change gradually, and the change of working temperature will make the laser power under the former input electric power change thereupon.

And be the temperature variation that can detect semiconductor laser module 11, generally existing way is to be arranged in the optical read/write head 1 with a temperature sensing device 13 (being generally thermistor or thermal sensing assembly).Be depicted as Fig. 1 (b) organigram of temperature sensing device 13 in optical read/write head 1 is set, but this structure will cause optical read/write head 1 comparatively complicated in assembling, cause the assembly cost effectively to reduce, and how to improve the disappearance of these existing means, be development fundamental purpose of the present invention.

Summary of the invention

The present invention is a kind of laser beam emitting device, is applied between a CD-ROM drive and the CD, and this device comprises: a housing is arranged in this CD-ROM drive and has a transmittance section; One Laser emission assembly is fixedly arranged on this enclosure interior and is electrically connected on this CD-ROM drive, and it is to launch a laser and by appearing this transmittance section; And semiconductor substrate, be fixedly arranged in this housing and be electrically connected on this CD-ROM drive, a photodetection assembly and a temperature sense assembly have been finished on it, this photodetection assembly be monitoring this receive the laser intensity that this Laser emission assembly sends and convert an electric signal to for this CD player utilization, this temperature sense assembly then produces a temperature variation signal according to variation of temperature in this housing and carries out reference for this CD-ROM drive.

According to above-mentioned conception, laser beam emitting device of the present invention, wherein this Laser emission assembly is a laser diode.

According to above-mentioned conception, laser beam emitting device of the present invention, wherein this semiconductor substrate is a silicon substrate, this photodetection assembly and this temperature sense assembly are to finish on this silicon substrate with a CMOS processing procedure.

According to above-mentioned conception, laser beam emitting device of the present invention, wherein this photodetection assembly is an optical diode, and this temperature sense assembly is a thermoinduction circuit.

The present invention is a kind of optical read head, is applied between a CD-ROM drive and the CD, and this optical read head comprises: a housing is arranged in this CD-ROM drive and has a transmittance section; And semiconductor substrate, be fixedly arranged in this housing and be electrically connected on this CD-ROM drive, a Laser emission assembly and a temperature sense assembly have been finished on it, this Laser emission assembly is to launch a laser, and this temperature sense assembly then produces a temperature variation signal according to variation of temperature in this housing and carries out reference for this CD-ROM drive.

According to above-mentioned conception, optical read head of the present invention, wherein this Laser emission assembly is a laser diode.

According to above-mentioned conception, optical read head of the present invention, wherein this semiconductor substrate is to be engaged with a gallium arsenide substrate by a silicon substrate to constitute, and this temperature sense assembly is to finish on this silicon substrate with a CMOS processing procedure, and this Laser emission assembly is then finished on this gallium arsenide substrate.

According to above-mentioned conception, optical read head of the present invention, wherein this temperature sense assembly is a thermoinduction circuit.

Description of drawings

The present invention is by following graphic and detailed description, so that more deep understanding:

Fig. 1 (a) is the organigram of optical read/write head in the existing CD-ROM drive;

Fig. 1 (b) is for being provided with the existing organigram of temperature sensing device in optical read/write head;

Fig. 2, its be the present invention be the existing semiconductor laser module of improvement with temperature sensing device be provided with respectively cause and lack the laser beam emitting device preferred embodiment organigram that develops out;

Fig. 3, its be the present invention be the existing semiconductor laser module of improvement with temperature sensing device be provided with respectively cause and lack another laser beam emitting device preferred embodiment organigram of developing out.

Fig. 4 (a) is (c) (d) (e) (b), and it is a silicon substrate, after the Laser emission assembly is formed at a gallium arsenide substrate in addition, both is engaged the fabrication steps that constitutes this substrate again.

Embodiment

See also Fig. 2, it is that to be the existing semiconductor laser module 11 of improvement be provided with institute respectively with temperature sensing device 13 causes and lack the laser beam emitting device preferred embodiment organigram that develops out in the present invention, this laser beam emitting device is mainly used between a CD-ROM drive (this is not shown) and the CD (this is not shown), this preferred embodiment consists predominantly of a housing 20, be arranged at the optical read head of this CD-ROM drive or optical read/write head in, this housing 20 also has a transmittance section 201, and the Laser emission assembly 21 that available laser diode is finished to launch laser be to be appeared by this transmittance section 201, and present embodiment is characterised in that photodetection assembly 220 and temperature sense assembly 221 mainly are to finish simultaneously on a silicon substrate 22 with a CMOS processing procedure.This photodetection assembly 220 that available light diode (photo diode) is finished is to receive the laser intensity that this Laser emission assembly 21 sends and convert an electric signal to for this CD player utilization in order to monitor this, and 221 of this temperature sense assemblies of finishing as for the available heat sensor circuit to carry out reference for this CD-ROM drive in order to produce a temperature variation signal according to variation of temperature in this housing 20.

From the above, the present invention integrates photodetection assembly 220 to finish on silicon substrate 22 with temperature sense assembly 221, therefore remove the too complicated disappearance of existing means assembling from, effectively reaches development fundamental purpose of the present invention.

See also Fig. 3 again, it is that to be the existing semiconductor laser module 11 of improvement be provided with institute respectively with temperature sensing device 13 causes and lack another laser beam emitting device preferred embodiment organigram of developing out in the present invention, this laser beam emitting device is mainly used between a CD-ROM drive (this is not shown) and the CD (this is not shown), this preferred embodiment consists predominantly of a housing 30, be arranged among the optical read head or optical read/write head of this CD-ROM drive, this housing 30 also has a transmittance section 301, and the Laser emission assembly 300 that available laser diode is finished to launch laser be to be appeared by this transmittance section 301, and present embodiment is characterised in that Laser emission assembly 300 and temperature sense assembly 311 and photodetection assembly 312 all can be integrated on the substrate 3.Wherein this temperature sense assembly 311 of finishing of this photodetection assembly 312 of finishing of available light diode (photo diode) and available heat sensor circuit is then to finish in a silicon substrate 31 in order to general CMOS processing procedure, after Laser emission assembly 300 then is formed at a gallium arsenide substrate 310 in addition, again both are engaged and constitute this substrate 3 (this fabrication steps can referring to Fig. 4 (a) (b) (c) (d) shown in (e)), thus, just can be with Laser emission assembly 300, temperature sense assembly 311 all is integrated in a substrate 3 with photodetection assembly 312, more can remove the too complicated disappearance of existing means assembling from, and then reach development fundamental purpose of the present invention.

Claims

1. a laser beam emitting device is applied between a CD-ROM drive and the CD, it is characterized in that this device comprises:

One housing is arranged in this CD-ROM drive and has a transmittance section;

One Laser emission assembly is fixedly arranged on this enclosure interior and is electrically connected on this CD-ROM drive, and it is to launch a laser and by appearing this transmittance section; And

The semiconductor substrate, be fixedly arranged in this housing and be electrically connected on this CD-ROM drive, a photodetection assembly and a temperature sense assembly have been finished on it, this photodetection assembly be monitoring this receive the laser intensity that this Laser emission assembly sends and convert an electric signal to for this CD-ROM drive utilization, this temperature sense assembly then produces a temperature variation signal according to variation of temperature in this housing and carries out reference for this CD-ROM drive.

2. laser beam emitting device as claimed in claim 1 is characterized in that: this Laser emission assembly is a laser diode.

3. laser beam emitting device as claimed in claim 1 is characterized in that: this semiconductor substrate is a silicon substrate, and this photodetection assembly and this temperature sense assembly are to finish on this silicon substrate with a CMOS processing procedure.

4. laser beam emitting device as claimed in claim 1 is characterized in that: this photodetection assembly is an optical diode, and this temperature sense assembly is a thermoinduction circuit.

5. an optical read head is applied between a CD-ROM drive and the CD, it is characterized in that this optical read head comprises:

One housing is arranged in this CD-ROM drive and has a transmittance section; And

The semiconductor substrate, be fixedly arranged in this housing and be electrically connected on this CD-ROM drive, a Laser emission assembly and a photodetection assembly and a temperature sense assembly have been finished on it, this Laser emission assembly is to launch a laser, and this temperature sense assembly then produces a temperature variation signal according to variation of temperature in this housing and carries out reference for this CD-ROM drive.

6. optical read head as claimed in claim 5 is characterized in that: this Laser emission assembly is a laser diode.

7. optical read head as claimed in claim 5, it is characterized in that: this semiconductor substrate is to be engaged with a gallium arsenide substrate by a silicon substrate to constitute, this temperature sense assembly is to finish on this silicon substrate with a CMOS processing procedure, and this Laser emission assembly is then finished on this gallium arsenide substrate.

8. optical read head as claimed in claim 5 is characterized in that: this temperature sense assembly is a thermoinduction circuit.