SE522279C2 - IR laser pointers with variable light intensity - Google Patents

IR laser pointers with variable light intensity

Info

Publication number
SE522279C2
SE522279C2 SE0002145A SE0002145A SE522279C2 SE 522279 C2 SE522279 C2 SE 522279C2 SE 0002145 A SE0002145 A SE 0002145A SE 0002145 A SE0002145 A SE 0002145A SE 522279 C2 SE522279 C2 SE 522279C2
Authority
SE
Sweden
Prior art keywords
laser diode
electric current
laser
light
power source
Prior art date
Application number
SE0002145A
Other languages
Swedish (sv)
Other versions
SE0002145D0 (en
SE0002145L (en
Inventor
Haakan Haakanson
Original Assignee
Gs Dev Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gs Dev Ab filed Critical Gs Dev Ab
Priority to SE0002145A priority Critical patent/SE522279C2/en
Publication of SE0002145D0 publication Critical patent/SE0002145D0/en
Priority to PCT/SE2001/001293 priority patent/WO2001095047A1/en
Priority to AU2001264498A priority patent/AU2001264498A1/en
Publication of SE0002145L publication Critical patent/SE0002145L/en
Publication of SE522279C2 publication Critical patent/SE522279C2/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
    • G02B27/20—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective for imaging minute objects, e.g. light-pointer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06216—Pulse modulation or generation

Abstract

An IR laser pointer comprises an IR laser diode (12), a power source (14) for providing electric current, and an energizing circuit (13, 15) for applying electric current from the battery to the IR laser diode for causing the laser diode to emit light. The energizing circuit is operable to apply a pulsating electric current form the power source to the IR laser diode for causing the IR laser diode to emit pulses of light. Control means (16, 17) are provided for adjusting the intensity of the light spot generated by the IR laser diode by pulse width modulation of the pulsating electric current.

Description

| . ~ . n; 2001-09-26 en\Puß1.xc\noc\1>\s7s-o4ss1:.doc Mss 2 2 7 9 2 laserdiodens drivström, medför en komplikation till följd av karakteristiken för laserljus-ström. Det finns en trös- kelström, under vilken laserdioden inte arbetar i lasermod. | . ~. n; 2001-09-26 en \ Puß1.xc \ noc \ 1> \ s7s-o4ss1: .doc Mss 2 2 7 9 2 the driving current of the laser diode, causes a complication due to the characteristic of laser light current. There is a threshold current below which the laser diode does not operate in laser mode.

Därför är det svårt att reglera laserdiodens uteffekt genom reglering av drivströmmen pä det sätt som tillämpas exem- pelvis vid en LED, speciellt för läg uteffekt. Detta beror på att tröskelströmmen varierar från en laserdiod till en annan och även är temperaturberoende.Therefore, it is difficult to regulate the output power of the laser diode by regulating the drive current in the way that is applied, for example, to an LED, especially for low output power. This is because the threshold current varies from one laser diode to another and is also temperature dependent.

Kort sammanfattning av uppfinningen Ett primärt ändamål med föreliggande uppfinning är att åstadkomma en pekare med IR-laser av det ovan angivna slaget, vid vilken ljusintensiteten hos den medelst IR- laserdioden alstrade ljuspunkten kan säkert regleras, och för detta ändamål kännetecknas pekaren med IR-laser enligt uppfinningen i överensstämmelse med patentkravet 1 av att aktiveringskretsen kan applicera en pulserande elektrisk ström från kraftkällan pà IR-laserdioden för att bringa la- serdioden att emittera ljuspulser, och att det finns en re- gleranordning för inställning av den medelst IR-laserdioden alstrade ljuspunktens intensitet genom pulsbreddmodulering av den pulserande elektriska strömmen.Brief Summary of the Invention A primary object of the present invention is to provide an IR laser pointer of the type indicated above, in which the light intensity of the light point generated by the IR laser diode can be safely controlled, and for this purpose the IR laser pointer is characterized according to the invention in accordance with claim 1 in that the activating circuit can apply a pulsating electric current from the power source to the IR laser diode to cause the laser diode to emit light pulses, and that there is a control device for setting the light point generated by the IR laser diode intensity by pulse width modulation of the pulsating electric current.

Ytterligare fördelaktiga särdrag hos uppfinningen är definierade i det osjälvständiga kravet.Additional advantageous features of the invention are defined in the dependent claim.

Kort beskrivning av ritningen För förklaring av uppfinningen närmare skall ett som exempel valt utförande därav beskrivas nedan med hänvisning till bifogade ritning på vilken FIG 1 är en sidovy av en pekare med IR-laser och FIG 2 är ett blockschema av en fullständig elektro- nisk krets för drift av laserdioden i pekaren och för vari- ering av ljuspunktens intensitet via pulsbreddmodulering. 10 15 20 25 30 35 u . n p . n n n . , u n q u f on- ou I' zocn-os-zs m\x>um.rc\noc\p\svs»oassmduc 1455 Å 2 2 7 9 3 Detaljerad beskrivning av uppfinningen Enligt FIG 1 kan pekaren med IR-laser enligt uppfin- ningen vara av konventionell mekanisk konstruktion, inne- fattande ett cylindriskt hus 10, som innesluter ett utbyt- bart batteri och en elektronisk drivkrets och som i ena än- den har ett optiskt system 11 för emittering av IR-ljus, som alstras av IR-laserdioden som en sträle.Brief Description of the Drawing To further explain the invention, an exemplary embodiment thereof will be described below with reference to the accompanying drawing, in which Fig. 1 is a side view of an IR laser pointer and Fig. 2 is a block diagram of a complete electronic circuit; for operating the laser diode in the pointer and for varying the intensity of the light point via pulse width modulation. 10 15 20 25 30 35 u. n p. n n n. , unquf on- ou I 'zocn-os-zs m \ x> um.rc \ noc \ p \ svs »oassmduc 1455 A be of conventional mechanical construction, comprising a cylindrical housing 10, which encloses a replaceable battery and an electronic drive circuit and which at one end has an optical system 11 for emitting IR light, which is generated by the IR light. the laser diode as a beam.

Med hänvisning till FIG 2 tillföres IR- (eller nära IR-) laserdioden 12 ström via en elektronisk laserdioddriv- krets 13 medelst ett batteri 14.Referring to FIG. 2, the IR (or near IR) laser diode 12 is supplied with current via an electronic laser diode driver circuit 13 by means of a battery 14.

En representativ IR-laserdiod för användning i laser- pekaren enligt uppfinningen är Sony SLD234VL, som alstrar en optisk uteffekt pà 50 mW vid en framström pà 70 mA och en framspänning pá 2,0 V. Vàglängden hos ljuset från IR- dioden är 785 nm. En annan lämplig IR-diod är Lasermate Corporation LD808-5I, mW vid en framström pá 25 mA och en framspänning pá 2,4 V. som alstrar en optisk uteffekt pà 5 Vàglängden hos ljuset pà den senare IR-dioden är 808 nm.A representative IR laser diode for use in the laser pointer according to the invention is the Sony SLD234VL, which generates an optical output power of 50 mW at a forward current of 70 mA and a forward voltage of 2.0 V. The wavelength of the light from the IR diode is 785 nm . Another suitable IR diode is the Lasermate Corporation LD808-5I, mW at a forward current of 25 mA and a forward voltage of 2.4 V. which produces an optical output power of 5 The wavelength of the light on the latter IR diode is 808 nm.

Ett lämpligt batteri för användning i laserpekaren enligt uppfinningen är en litiumcell DLl/3N, pà 160 mAh.A suitable battery for use in the laser pointer according to the invention is a lithium cell DL1 / 3N, of 160 mAh.

IR-laserdioden 12 drives med pulser från en program- som har en kapacitet merbar pulsgenerator 15, vilken erhåller kraft från batte- riet 14 via reglaget 13 för laserdiodens driveffekt. Bril- jansen hos IR-laserdioden och därmed intensiteten hos den medelst dioden alstrade ljuspunkten, vilken emitteras genom det optiska systemet ll, regleras genom reglering av utef- fekten fràn IR-laserdioden medelst pulsbreddmodulering. An- vändaren ställer in den önskade briljansen hos punkten med användning av en flerlägesomkopplare 16, vilken reglerar en oscillator 17, som är förbunden med pulsgeneratorn 15, var- vid manöverorganet 18 för omkopplaren är tillgängligt pä utsidan av huset 10. 2001-09-26 E:\PUBLIC\DOC\P\576-046SE.doC MS 5 2 9- BJ \J \O Företrädesvis finns i den beskrivna kretsen en anord- ning för att kompensera för ändring av laserdiodens karak- teristika med temperaturen. Ett möjligt sätt att uppnå det- ta är att inordna en termistor i kretsen i serie med laser- dioden för att åstadkomma kompensation i strömmen, då tem- peraturen ändras.The IR laser diode 12 is driven by pulses from a program having a capacitive pulse generator 15, which receives power from the battery 14 via the control 13 for the driving power of the laser diode. The brilliance of the IR laser diode and thus the intensity of the light point generated by the diode, which is emitted by the optical system II, is regulated by regulating the output power from the IR laser diode by means of pulse width modulation. The user sets the desired brilliance of the point using a multi-position switch 16, which regulates an oscillator 17, which is connected to the pulse generator 15, the switching means 18 being available on the outside of the housing 10. 2001-09-26 E: \ PUBLIC \ DOC \ P \ 576-046EN.doC MS 5 2 9- BJ \ J \ O Preferably, in the described circuit there is a device for compensating for changing the characteristics of the laser diode with the temperature. One possible way to achieve this is to arrange a thermistor in the circuit in series with the laser diode to provide compensation in the current, when the temperature changes.

Ett annat sätt att reglera IR-diodens uteffekt är att använda en fotodiod, som skulle kunna vara inbyggd i IR- diodens kapsel.Another way to regulate the output power of the IR diode is to use a photodiode, which could be built into the capsule of the IR diode.

Claims (1)

1. N 2001-09-26 EApußuzcuuocunsvsfamsådz; 2 2 7 9 PATENTKRAV En pekare med IR-laser, innefattande en IR-laserdiod (12), en kraftkälla (14) för tillhandahållande av elektrisk ström samt en aktiveringskrets (13, elektrisk ström från kraftkällan pà IR-laserdioden för att kännetecknad av att aktiverings- 15) för applicering av denna skall emittera ljus, kretsen (13, 15) är anordnad att applicera en pulserande elektrisk ström fràn kraftkällan (14) pá IR-laserdioden (12) för att bringa laserdioden att emittera ljuspulser, och att det finns en regleranordning (16, 17) för inställ- ning av den medelst IR-laserdioden alstrade ljuspunktens intensitet genom pulsbreddmodulering av den pulserande elektriska strömmen.1. N 2001-09-26 EApußuzcuuocunsvsfamsådz; 2 2 7 9 PATENT CLAIMS An IR laser pointer, comprising an IR laser diode (12), a power source (14) for supplying electric current and an activating circuit (13, electric current from the power source on the IR laser diode for characterized in that activation 15) for applying it should emit light, the circuit (13, 15) is arranged to apply a pulsating electric current from the power source (14) to the IR laser diode (12) to cause the laser diode to emit light pulses, and that there is a control device (16, 17) for adjusting the intensity of the light point generated by the IR laser diode by pulse width modulation of the pulsating electric current.
SE0002145A 2000-06-08 2000-06-08 IR laser pointers with variable light intensity SE522279C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE0002145A SE522279C2 (en) 2000-06-08 2000-06-08 IR laser pointers with variable light intensity
PCT/SE2001/001293 WO2001095047A1 (en) 2000-06-08 2001-06-08 Ir laser pointer
AU2001264498A AU2001264498A1 (en) 2000-06-08 2001-06-08 Ir laser pointer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0002145A SE522279C2 (en) 2000-06-08 2000-06-08 IR laser pointers with variable light intensity

Publications (3)

Publication Number Publication Date
SE0002145D0 SE0002145D0 (en) 2000-06-08
SE0002145L SE0002145L (en) 2001-12-09
SE522279C2 true SE522279C2 (en) 2004-01-27

Family

ID=20280018

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0002145A SE522279C2 (en) 2000-06-08 2000-06-08 IR laser pointers with variable light intensity

Country Status (3)

Country Link
AU (1) AU2001264498A1 (en)
SE (1) SE522279C2 (en)
WO (1) WO2001095047A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081631A (en) * 1991-04-03 1992-01-14 Eastman Kodak Company Direct modulation of laser diodes for radiographic printers
US5473464A (en) * 1994-07-15 1995-12-05 Metrologic Instruments, Inc. Accessory device for modulating the laser output of a pen-clip actuatable laser pointer
US5515392A (en) * 1995-01-05 1996-05-07 Eastman Kodak Company Laser diode control circuit with power supply compensation network
DE29719984U1 (en) * 1997-11-11 1998-04-02 Herchet Volker Portable and mobile electronic miniature circuit for generating nearly parallel light beams by semiconductor lasers (laser diodes)

Also Published As

Publication number Publication date
AU2001264498A1 (en) 2001-12-17
WO2001095047A1 (en) 2001-12-13
SE0002145D0 (en) 2000-06-08
SE0002145L (en) 2001-12-09

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