JPS5990241A - Light source device - Google Patents

Abstract

PURPOSE:To obtain a small-sized light source device which is positioned easily and superior in mechanical strength by uniting a semiconductor laser element holder and a lens holder together through a coupling ring. CONSTITUTION:A semiconductor laser 11 is inserted from the rear of the element holder 20 and united with an adhesive during assembly. A lens barrel 12, on the other hand, is inserted into the rear part of an auxiliary cylinder 32 and united with an adhesive, then the auxiliary cylinder 32 is inserted into the lens holder 31 and fixed temporarily with a screw 42. Then, while the holder 20 and coupling ring 30 are fixed lightly with a screw 40 in an abutting state, the optical axis direction of the laser 11 is made coincident with the center axis of the coupling ring 30. Laser light 50 is emitted from the center hole 50' of an observation plate 51 to the center of a lens 12 and the position of a lens block is fixed so that 0-order interference light coincides with the center hole 50' and adjusted and fixed with the screws 41 and 42 so that the light spot of the laser 11 coincides with the center hole 50'. Thus, the small-sized light source which is positioned easily and superior in mechanical strength is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a light source device using a semiconductor laser, and relates to a light source device using a semiconductor laser.
The present invention relates to a light source device suitable for an optical disk device in which a semiconductor laser is required to have a high output power.

[Prior art]

In an optical disk device, a metal film formed on a rotating disk surface is irradiated with a laser beam, and when information is recorded, the irradiation power of the laser beam is modulated to create information on the metal film. A hole (pip) is formed in accordance with o/', and when I11 is generated, the metal film is irradiated with a weak laser beam, and information is recognized by detecting changes in reflected light depending on the presence or absence of bits. -1% If
As a light source for f, C; 1, combine a small semiconductor laser element and =1 remeter 1/nos system for laser beam flux, and the combined light source jif+'' is, +' , % river is used, but tt/, the lack of output power of conductor 1--ri is ura/4
(In order to use the high irradiation bar necessary for bit formation when recording 111 information, it is necessary to use the semiconductor
It is necessary to increase the aperture of the collimator 1/lens to focus it into parallel light as much as possible. However, as the aperture (aperture) is increased, the depth of focus of the collimator lens becomes shallower. ,Half,',1v, body level is 1/ns system Kichi's sweating is severe, 11°'1αze technique?I:I is an inevitable punishment.

Lifting 1 l > 4 is 1 + 1 - 4t of source device〆f,
12 is a collimator lens system, and 13 is a 1/2 lens element. In this I1 configuration, fC is a collimating lens system. [If the numerical aperture of 2 is (), 5, 10, and the wavelength of the output 9°C from the da body terminating element 11 is 83+)/curve, then there are approximately 31 curves in the optical axis direction and perpendicular to the optical axis. 4. In-plane alignment with an accuracy of approximately 20 to 30 μm is required.
Beyond this +111χ range, 111 from lens system 12
The parallelism accuracy of (force)°(, deteriorates 1/, and when this is narrowed down as a light spot on the disk surface with the objective lens system,
Deformation occurs due to spherical aberration or coma aberration, and a given spot becomes 1! The problem arises that it cannot be used.

On the other hand, since there are variations in the mounting sheath 1jl to the board (steno) parts of the semiconductor plate/nod which becomes the light emitting point when the body 1/4) body 1/ - Lee - ζ child 11ic° is attached. , the light emitting point (lL ffv, and redundant 1!
Body 1. - Rearrangement - 11 low l/ance system 12 and place I'
t 'Ql (this i; L-1-note 3 redundant position 1i-in addition to 'i':, Qil, output of the body Rayleigh element 11) light 1111 of C and light of lens system 12 It is also necessary to make adjustments to match the direction with the axis.

"LqA' between the double semiconductor element r and the lens system
(T, frl, 1 chestnut, for example, half-sized 4'j'
:Book 1.・A laser beam change measuring device that focuses on the self-coupling effect of −υ′, which moves the relative position of the semiconductor laser element with respect to the lens thread three-dimensionally, and enables 1゛j1 employment of the laser IJ-element. - It can be done by using the auxiliary force on the suction device 1, but '1 (1
In the conventional configuration shown in FIG. 1, these alignments are performed using the space 14 between the semiconductor laser element 11 and the lens bolt 13, and when the alignment is completed -1: fil: By filling the space 34 with the adhesive 15, the relative positional relationship (t7) of both parts was fixed.

Mli-CI had the disadvantage of instability due to changes in the adhesive 15 over time, or due to relative positional fluctuations between the laser part and the lens part. Also, according to the above jM−4i, l/ ;, 'lrl+7, half i
7. The radiation generated in the lf body 1 and the slope element 11 is sufficient. Stable L/-1tIi mab due to J
In order to maintain the
``I'' required a force to attach to the heat fin 1 on the base of the main body IJ.In this case, the light source was 1; = l'r'J: At the same time as the size increases, the heat dissipates) The applied force causes the contact area to deform, 1'';, 4i
11. "fJzu < 1., trul, -, me, i'(:
+l:X? 41ff)ylGj! (it'; 1
JFj Handling ((-There was a problem of cheapening the color of note 7 of 7.

(Purpose of the invention 1 杢'5+", ,", 11j, l... 1 mi) The conventional problem δ・乃了decided, small (already 1 hat 11 kai 1'
The purpose of the present invention is to provide a light source device with excellent intensity.

Another object of the present invention is half 2! ), it is an object of the present invention to provide a 9°6τj east device having a structure that allows easy alignment of the body 17-re' element part and lens part 11'.

[Outline of the invention]

In order to achieve the above object, the redundant (1/R) device of the present invention includes an element bolt that holds the semiconductor laser element in close contact with its outer periphery, a lens bolt that holds the lens system by inserting it, and an F
Consists of a cylindrical joint interposed between the arranged holsters,
One end of the above joint is perpendicular to the center of the inner hole: ta+,
(End number 14: has a concave or convex spherical surface, and the front end of the element holter ↑t1, also known as the rear of the upper C7 nozzle porta) The end has a shape that matches the end of the coupling member. 21- is considered a liw sign.

[Embodiments of the invention]

Embodiments of the present invention will be described below with particular reference to the drawings.

FIG. 3 shows the final assembly of the power supply device Q according to the present invention [≦1, 11 is a semiconductor laser →) element, and 12 is a collimator 1.
Shows the lens barrel of /ance type. Semiconductor l, -li' element 11 (
J ahead! ν;1.1 Shape the outer part 11ii into a spherical surface 20A)'J
■Shita element Volta 201r Nakagome 1'11 was held, on the other hand,
Collimation lens system 12 [; I Zensukeen 1゛Inside of store 32 (this device)
:(Inserted and held in the circular hole of +.Lance Holter.Eye 1
11 prefectures: i'+131A iJ inner circular hole Ib 11+
-, lease-4 [i.e. L/ lease yarn + 2))'(: '
i + ll lc m straight l, < plane (this is formed - C is 6
3s ζ2 sea 1, r-holter 20. j, - lens holder 3], and the connecting link is 30 of 111, so 3 + IA, i, and 11 of mind'fi.
ll Ij nu'-1t, vertically 11jj 7λ and rear end inner surface; 3 (for ζ; l element holder front end C1)
'f: Appropriate self-pulling z, ll+ directions are formed on the R surface 20A. Combined link 30J: So-f Poto/Yu 20 and c;
l not so 40 (from ζ, 11, this place is self, distance 1'
■) Lee-Li 1 rule (C1 Fujita 1. Even between the 5-mounted link 30 larger than the diameter and the Nsporta 31,
(:'I', Ii″f, , +, il arrangement 1st 11th (
It is secured with a screw.

Satri+, 'il'f formation ((according to the link 30
The optical axis of the laser beam can be made parallel to the central axis of the coupling ring 30, while the optical axis of the laser beam can be made parallel to the central axis of the coupling ring 30. 1.
Seminal link 30. ! Two-lens Holk 31c! : Matching ~ f; It goes to change the γ electric head, and 1/ns system'J
Y: axis/'i knee#:'i juice/tsuku center 11 ri 11
Since it is possible to move in the same direction, the final (this 1 - the fan and the lens system) "CΦ mountain σ knee 1 (sa IA: - - [2 can be done. talent] this, Ura 1 go Enura, $2-￥,)゛ii咄7(i
Move it in the direction of A1 and pick 17~The>l'i-)'C
It is also possible to match the point to the focal point of Tong's Thread 12).

Next 1 Kohin, my younger sister L, the place of work 11 standing hands + Ii l this one, J1 Tsujiku S.

First, 41st) Ij (clarification (11<, semiconductor 1t 1/-
Insert from the ridge of the rifumuko 1 j-element holter 20, and
, ÷゛15 conductive contact/l'f agent, f! III Eha H (
7 in the chemical industry ((1 product name ``Lambda rto J and integrated.-10,':B 51111.'': As shown, Cori, /-ri I/Ns system (for Apricot tube 12'M-1
i1i! , 1f in the tomb of IjJlIJ 1Fij32
] 1 person, 7"!M 4ji:?
i;'1) 32 i)-Lenosuf 11 Luk 311 Koll
lj person, screw 112 years old 1 anti-ichimeshi-C old.

Next 1, (Washiko Hori 20, 1 old sweat link 30, and a lazy sword) Bet, screw, ↓ 0 [1st pu, ゛ written, already no; The angle is i+1llllηi%,
half e, +7. Align the direction of the round axis of the idle relay and the center 1i1+ of the connecting link 30. This work is performed using an element voltaic positioning device, an nlt auxiliary light (J: 1e-Ne laser) not shown by arrow 50-Q in FIG. 6, a reflected light observation plate 51, and a brain mirror 52. I can do it. Zunawaji, element boulder 11 (i7', if'
/The semiconductor laser element 11 is held by a fixing device to 1ie-
When facing the Nc letter at a predetermined distance and first irradiating the laser beam 50 onto the light emitting chip inside the output window of the semiconductor laser element, it emits light (reflected and diffracted light from the depth). is projected on the observation block L/---1.5 times.In this state, reflection diffraction)'c:'! 1st order)'(,
is the emission point of the 1lc-Ne laser, that is, the observation block 1)-1
・Insert the element bolt 11 so that it coincides with the center hole 50' of 51.
When the direction of the laser beam is adjusted to N"6 and the positioning device is fixed in this position, the optical axis of the semiconductor laser beam becomes 1.1e-Nc l/
- It means that 50 lights and 1111 lights are a lucky match.

Next, connect the zone mirror 52 to the end face of the link 30:
1 (IA Ic close contact, 11. e -Ne While irradiating the laser beam 50, adjust the direction of the coupling ring 30 so that the reflected spot from the mirror = - coincides with the center hole 50' of the observation plate 51, When the screw 40 is tightened, the central axis of the coupling link 30 is positioned 16 parallel to the optical axis of the semiconductor laser.
This means that they have been combined.

The laser side block obtained in this manner is butted against the lens side block shown in Fig. 5 at 30A and 31A, and the contact position is adjusted by s''1 so that the optical axes of both sides coincide. 30 and lens bolt 31 with screw 41
This can be easily achieved by using the He--Ne laser used in FIG. 6, as described above.

First, the specified pressure 1'1l11. While holding it flat on the positioning device 7'7, turn it toward the center of the collimator lens 12.
When the e-Ne laser beam 50 is irradiated, concentric reflected interference light from the lens surface is projected onto the observation plate 1. Therefore, the position of the lens flock is adjusted and fixed so that the center of the interference light coincides with the light emitting point 50' of the Jle-Ne laser. In this state, the half-2n body is expanded →]
- Emit element 11 (when you shake it, the relay side is 0)'t
ll'llll KaL/ 7 S series 0)')Y,'1
1+1 To-FCL (if, lE i, li!i) In this case, the L-respot is connected to a position shifted from the center point 50' on the test piece 151. Therefore, the screw 41 is
' Loosen the l/-lisbond to the center point 50'.
Position the l/-li l1il flock so that X4, iI
! ! By adjusting screw 4 with -j-ρ and tightening screw 4 with -j-ρ, you can create a combination of ``J'' flfl+ and 9'' (, ``I''l11 on the tons side. f
The wavelength of the relay element is near-infrared light (wavelength around 830f)
IJ, 5 white is the infrared J as observation f l/-t□ 50
1+”Q M, t” (B Rie (:1, US 4 7-17
7 #] 9nkun 1: 0) +1. lj item, 1
．． It, -1) II (you can read it using J S I'll (also the moon)).

In the group ＼ work 1, ()) 11, after -1, the 11th point Kichiji 1 remeterence system 1
A51. with the focus of 2. In position 11, (1') I1゜This place 11'f call is, for example, half = V body, -riB),:
The output light from the lens 11 is arranged in front of the lens system 11',
I. The self-coupling (resonance) phenomenon that occurs when the light is reflected by a circular prism and returned to the light emitting point]-I). Loosen the screw 42 that temporarily fastens the auxiliary cylinder 30 and set the auxiliary cylinder 1). <
J may be slightly moved back and forth A+1M M',': and the screw 42 may be fixed at the position where the laser beam intensity is maximum.

µ'2 described implementation (<'11, 1/lens holder:
The tip i/M portion of 20 is made into a spherical shape, and the rear end portion of the connecting link 30 is made into a curved surface that conforms to the above 1'li plane. Even if the link 30' is formed with a spherical surface and the lens holder 20' is formed with a curved surface that conforms to the 12-sphere curved surface, J2 will not occur. Also, although the 1st side is omitted, the 4 concubines and 1 drunkenness of Lensborda and 1 sensai link)Y; perpendicular to 1lil+;? It is also possible to use C as a combination of a spherical surface and a curved surface.

According to the present invention, an element Holter and a lens are used, and a connecting link is interposed between the lens and the lens. - There is an advantage that the system between the relative position of the lens thread can be set up precisely and firmly at the same time. Insert it into the Volta, and connect this Body Volta to the Lens Volta via the connection link (it j' + 1, so each copy is transferred). By using heat dissipating fins as in the past, the heat generated in the semiconductor laser element can be efficiently dissipated to the outside of the light source device. In order to further enhance the heat dissipation effect, the element holster (when the outside/l'J is shaped with a heat dissipation fin - C is also strong), and the outer shape of the coupling link and lens holder also has a shape similar to that of the optical holder. Implementation in spelling: i'a, L/any form Vζ
Since it can be designed as a J5 device, it is extremely advantageous for handling it as a J5 device.

4 drawings: JAM Meikoru 1 and 2 are diagrams showing the (^) formation of the light source device of υ [U.S., respectively.
Showing example i 1 - Cross section, i: Js 41) gl -9;'
:: 6 Figures IJ, 1st, 3rd and 411B are diagrams to explain the assembly process. , '147 is a diagram showing another example of the light source device 1 according to the present invention.

〕11・Cow 2
．． #f・Body Tarli° element 12... Lens system 20...
・Element Holter 30・・Connection:/ri, (1・
・Shi/Sporta 32・ 1 Yama QJ) Cylindrical Agent Patent Attorney Susuki 1) Toshiyuki No. 1 Closed Door Diagram @ '3 Ward No. 4 Akira Oda Off Company 300, Nakai-cho, Ashigarakami-gun, Kanagawa Prefecture

Claims (1)

[Scope of Claims] ], -'I' jff body laser resistor, an element bolt that holds the semiconductor laser element in close contact with the semiconductor laser element in its entire rotation; C7, from a lens system for focusing the laser light emitted from the body laser element, a lens holder for inserting and holding the lens system, and a cylindrical coupling part interposed between the element voltage and the lens holter. One end of the coupling part has a plane perpendicular to the center +lil of the inner hole, the other end has a concave or C4 convex f), and -) the front end of the 2111 element porc'! '-1-rh,: A light source device characterized in that each of the rear end portions of the lens holster has a surface having a shape compatible with the ) 414 portion of the coupling portion 1J. 2. Front 1: (The mother-infant voltage and the coupling part I, and the coupling part; l=t, L lens holder are coupled so that the relative position 1 and/or relationship can be adjusted at each end surface. The light source device of item 1, where r and 'q are specified. 3 01st day ago/Nspork provides an auxiliary cylindrical member into which the 011 lens system is loaded, and holds the auxiliary cylindrical member so as to be slidable in the axial direction. 2. The light source device according to item 1 or 2, characterized in that the cylindrical holding member has an end face that fits with the coupling portion 4A.