JPH01233408A - Laser light source unit - Google Patents

Abstract

PURPOSE:To maintain an adjustment state stable regardless of fixation or afterward temperature variation by fitting and fixing a 1st member which holds a laser light source to a 2nd member where a collimator lens is incorporated. CONSTITUTION:The 1st member 20 which holds the laser light source 8 is fitted to the 2nd member 21 where the collimator lens 1 is incorporated. Then the both 20 and 21 are moved relatively in plane along the optical axis of a laser beam to adjust finely the gap between the laser light source 8 and collimator lens 1, thereby making a focus adjustment. In this adjustment state, the 1st member 20 and 2nd member 21 are fixed directly and this fixation is carried out tightly and stably in mutual plane relation. Consequently, the adjustment state is maintained stably regardless of the fixation or afterward temperature variation.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a laser light source unit. That is, the present invention relates to a laser light source unit such as a laser light source and a collimating lens used in an optical system of an imaging device using a laser beam.

"Prior Art" Such a laser light source unit has conventionally been as follows. FIG. 6 is a perspective view of main parts of a conventional laser light source unit.

A radial light beam from a fixed laser light source (not shown) passes through a collimator lens 1 and becomes a parallel light beam. The lens barrel 2 of the collimating lens 1 is made of a relatively thin cylindrical body, and is movably fitted into the guide hole 4 of the outer barrel 3. The outer barrel 3 is fixed to the bracket 5 at one end, and the bracket 5 is the frame stand of the main body of the device (not shown)
Fixed.

At the time of set-up, such collimating lens 1 is fixed after adjustment as follows.

First of all, focus adjustment is performed. That is, by slightly moving the lens barrel 2 along the optical axis A, the distance between the collimating lens 1 and a laser light source, such as a laser diode, that is, the distance between the two that requires strict accuracy, is finely adjusted, and the focus is adjusted.

After such adjustment is completed, the collimating lens l is fixed.

That is, the fixing screw 6 is screwed into a screw hole 7 passing through the outer cylinder 3 and tightened, so that the tip of the fixing screw 6 is brought into approximate point contact with the inner lens barrel 2, and pressed locally.

In this way, the lens barrel 2 is held between the fixing screw 6 and the guide hole 4, and the lens barrel 2, that is, the collimating lens 1, is fixed in the above-mentioned adjusted state.

In the case of color imaging, laser beam overlay adjustment is then performed.

That is, the adjustment of superimposing the three laser beams from the three collimating lenses 1 and superimposing their convergent spots into one is performed by each prism with strict precision.

[Problems to be Solved by the Invention] By the way, the following problems have been pointed out in such conventional laser light source units.

First, it was pointed out that the adjustment state was changed or destroyed due to fixation.

That is, after the tip of the lens barrel 2 is locally pressed by substantially point contact, the fixing screw 6 generates backlash, and the cylindrical lens barrel 2 undergoes elliptical strain deformation due to the pressing force of the fixing screw 6.
In addition, due to this, changes in the arrangement of the lens balls of the collimating lens 1, rotation of the lens barrel 2 due to the pressing force due to tightening, and slight movement along the optical axis A, etc. may cause changes in the previously adjusted area due to fixation, resulting in damage. There were many things I ended up doing.

Secondly, it was also pointed out that the adjustment state may change or be destroyed due to temperature changes after the fact.

In other words, even if the above-mentioned adjustment state does not change or break during fixation, if the lens barrel 2. The outer barrel 3° fixing screw 6 and the like expand, contract, expand and contract separately, and as a result, the force relationship between, for example, the lens barrel 2 and the fixing screw 6 changes. In this way, the mutual positional relationship, the interval between the two, etc. change, and the initial adjustment state changes and may be destroyed.

Thirdly, the change or destruction of the adjusted state caused by such a subsequent temperature change was not restored to the original state even if the temperature returned to its original state.

In other words, for example, since the lens barrel 2 is fixed by local pressure contact and clamping as described above, there is no immovable fixed point that serves as a reference for expansion and contraction due to temperature changes. If the temperature is changed to the other end, even if the temperature returns to the original value at the time of adjustment, the initial positional relationship, 9 intervals, etc. will be disrupted.

So, fourthly, these first. Second. The third problem caused the following problem.

In other words, there may be many members interposed between the collimating lens 1 and the laser light source, and due to the above-mentioned fixation or temperature changes, the distance between the collimating lens 1 and the laser light source, that is, the distance between the collimating lens 1 and the laser light source, must be adjusted with strict precision. The adjusted distance between the two may change and the focus adjustment may be destroyed.

In addition, in the case of color imaging, the direction of the light beam from the lens 1 changes as the lens barrel 2 tilts and its axial direction changes due to the above-mentioned fixed or subsequent temperature changes, which requires strict accuracy. In some cases, the superposition of each laser beam adjusted to be destroyed.

It has been pointed out that in the created image, occurrences of out-of-focus due to poor focus adjustment, color shift due to poor overlay adjustment, etc. have occurred.

In the conventional example, such a point was pointed out.

In view of these circumstances, the present invention has been made to solve the problems of the conventional example described above, and the present invention has been made in order to solve the above-mentioned problems of the conventional example. It is an object of the present invention to propose a laser light source unit whose adjusted state is stably maintained by mounting and fixing, regardless of fixation or subsequent temperature changes.

"Means for Solving the Problem" The technical means of the present invention to achieve this object are as follows.

This laser light source unit includes a laser light source that emits a laser beam, a first member that holds the laser light source, a collimating lens that collimates the laser beam, and a second member that incorporates the collimating lens. ing.

The first member is attached to the second member, and both of them are movable relative to each other in a plane along the optical axis of the laser beam in order to adjust the distance between the laser light source and the collimating lens. There is.

Further, in the adjusted state, the first member and the second member are fixed.

"Function" Since the laser light source unit according to the present invention is comprised of such means, it functions as follows.

A first member holding a laser light source is attached to a second member incorporating a collimating lens.

Then, both are moved relatively and in a plane along the optical axis of the laser beam, so that the distance between the laser light source and the collimating lens is finely adjusted, and the focus is adjusted.

In such an adjusted state, firstly, the first member and the second member are
The parts are directly fixed. Further, this fixing is performed strongly and stably between the planes, and is performed without point contact or local pressure contact or pressing due to tightening.

Secondly, even if there is a subsequent temperature change in this regard, the laser light source, the first member, and the collimating lens.

Since the second member and the like expand, contract, expand and contract together, changes in their relative positional relationship, such as one interval, remain within an allowable range.

Thirdly, after that, the temperature generally returns to the original value at the time of adjustment, and in that case, the distance between the two positions, etc., also returns to the original value.

With the adjusted state maintained stably in this way,
A laser beam from a laser light source passes through a collimating lens, and images are formed.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

First, the configuration and the like will be explained in the order of the optical system of the laser imaging device, the laser light source unit, its fine adjustment mechanism, and examples of other fine adjustment mechanisms.

The outline of the optical system of the laser imaging device is as follows.

FIG. 7 is a perspective explanatory view showing an example of an optical system of a laser imaging device. A laser diode 8 is a laser light source, and during image formation, a laser beam 9 is emitted from the laser diode 8 in accordance with a given image signal.

The illustrated example shows the case of color image formation, in which three laser diodes 8 corresponding to each primary color are used, and laser beams 9 with different wavelengths are emitted from each laser diode, thereby producing colors of cyan, magenta, and yellow. It has become.

Each laser beam 9, which is a radial beam emitted from the laser diode 8, passes through a collimating lens 1 and is collimated into a parallel beam.

After that, the laser beam 9 on the left side of the figure is reflected by a reflecting prism 10.
The laser beam is reflected by the laser beam 9, and is further superimposed on another laser beam 9 in the synthesis gicroic prism 11 in order. In this way, the three laser beams 9 have their convergent spots superimposed into one light beam, and reach the deflector 12.

This deflector 12 is made of a rotating polygon mirror such as a polygon mirror, for example, and after the laser beam 9 is deflected and scanned by this deflector 12, it reaches a folding mirror 14 via an fθ lens 13.

The laser beam 9 reflected by the folding mirror 14 passes through the window glass 15, and then irradiates and exposes media such as photosensitive paper 17, which are conveyed by a pair of front and rear conveyance rollers 16, in a predetermined manner.

That is, such a laser beam 9 causes the photosensitive paper 17 to
The image is scanned in the main scanning direction, which is the width direction. At the same time, the image is scanned on the photosensitive paper 17 in the sub-scanning direction, which is the transport direction, by being fed at a constant speed by the transport roller pair 16.

In this way, the photosensitive paper 17 is two-dimensionally scanned and exposed to write a latent image, and then developed to form an image.

In addition, 18 in the figure is a light receiving sensor, and this light receiving sensor 18
As a result, a signal for creating an image drawing tanning pulse for positioning the start of image scanning is obtained. 19 is a mirror that directs the laser beam 9 to such a light receiving sensor 18.

The optical system of the laser imaging device is like this.

Next, the laser light source unit will be described.

FIG. 1 is a partially sectional front view showing an embodiment of a laser light source unit according to the present invention. FIG. 2 is a perspective view of the second member. FIG. 3 is a perspective view of the first member.

For example, a laser light source unit incorporated in the optical system of the laser imaging device as described above includes a laser light source, for example, a laser diode 8, that emits a laser beam 9, a first member 20 that holds this laser diode 8, and a laser beam 9. It includes a collimating lens 1 for collimating the lens, and a second member 21 into which the collimating lens 1 is incorporated.

First, the first member 20 of the laser light source unit forming such a block is made of a plate having an abbreviated cross section. A screw hole 24 is provided in the vertical temporary portion 22 of the first member 20, and by screwing into the screw hole 24 (not shown), the laser diode 8 fixed to the screw is attached and held. It has become. Note that 23 in FIG. 3 is a hole through which the terminal of the laser diode 8 held in this manner is inserted.

Further, a base plate part 25 is connected at right angles to the lower part of the vertical plate part 22. This substrate portion 25 is made of a thicker plate and has two elongated holes 26 vertically provided therein. This long hole 26 is
It consists of a through hole whose major axis is formed along the optical axis A, which is the horizontal direction.

On the other hand, the second member 21, which is a lens frame, has a main body part 27 in the shape of a horizontally oriented rectangular prism, and the lens balls 13, 1□, 1i of the collimating lens 1 are fixedly assembled into the main body part 27, which is bored in the main body part 27. The lower end of the main body part 27 has a central part 29.
．． A pedestal portion 29 is integrally formed with the pedestal portion 29 interposed therebetween.

The pedestal part 29 has a long rectangular shape along the optical axis A, and screw holes 30 for mounting and fixing are formed in one end 29□ and the other end 293, respectively. Through this screw hole 30, the laser light source unit such as the pedestal 29, the second member 21, and the first member 20 is fixedly attached to a frame stand (not shown) for an optical module of the main body of the apparatus.

One end portion 29□ of the pedestal portion 29 has the first member 2 on it.
A laser diode 8 is mounted so as to face a collimator lens 1, and the laser diode 8 is a flat plate body having a width that allows it to slide along the optical axis A of the laser beam 9. Through such sliding, the distance between the laser diode 8 of the first member 20 and the collimating lens 1 of the second member 21 is finely adjusted.

Also, two blind screw holes 31 are formed near the center of one end 29□ of the pedestal portion 29.

Each of the screw holes 31 is located at a position where it can overlap with a part of the elongated hole 26 of the attached first member 20. By screwing the screw hole 31 (not shown) through the long hole 26, the first member 20 is connected to the second member 2.
Fixed on 1. The screws used for this screwing are
Of course, one is used whose head diameter is larger than the short diameter of the elongated hole 26.

In the case of scalar imaging, three such light source units are used.
(See Figure 7).

The laser light source unit is like this.

Next, the fine adjustment mechanism 32 will be described.

The fine adjustment mechanism 32 is attached to the second member 21 and is used for fine adjustment of the distance between the laser diode 8 and the collimating lens 1 . The fine adjustment mechanism 32 shown in FIG. 1 and FIG.
4 and a micro screw 35.

The guide wall 33 is located at one end 2 of the pedestal section 29 of the second member 21.
They are respectively erected from both side edges of 9□ and sandwich both side surfaces of the first member 20 between them, thereby guiding the sliding movement of the first member 20 along the optical axis A from both sides. Further, the end wall 34 is erected at the end of one end 29□ of the pedestal portion 29,
A screw hole 36 is provided near the center, and a microscrew 35 is screwed into this screw hole 36.

Therefore, in this fine adjustment mechanism 32, the micro screw 35
knob at the proximal end of 35. By rotating the microscrew 35, the tip 35□ of the microscrew 35 moves forward and backward little by little. Then, the first member 20 is pressed by the tip 35□ of the microscrew 35, so that the first member 20 is pressed against the guide wall 33.
It slides little by little on the second member 21 while being guided between the parts.

As a result, the laser diode 8 of the first member 20 is gradually moved along the optical axis A, and the distance between the second member 21 and the collimating lens 1 is finely adjusted.

Note that after such focus adjustment, the first member 20 is fixed to the second member 21 via the elongated hole 26 as described above.

The fine adjustment mechanism 32 shown in FIG. 1 etc. has this structure.

Next, examples of other fine adjustment mechanisms will be described.

FIG. 4 shows another fine adjustment mechanism 32 attached to the second member 21.
FIG. 2 is a partially sectional front view showing an example of the above. This fine adjustment mechanism 32° consists of an end wall 34, a fine adjustment threaded rod 37, and a stopper 3.
8 and a tapped hole 39.

The end wall 34 is erected at the end of the one end 29□ of the pedestal portion 29 of the second member 21, as described above, and has a through hole 40 near the center. In this through hole 40, a fine adjustment threaded rod 37 is provided.
is inserted through the fine adjustment threaded rod 37, and a knob 37. is provided at the front and rear of the through hole 40. A stopper 38 is fixedly provided. Therefore, the fine adjustment threaded rod 37 is rotatable but cannot be moved back and forth in the axial direction.

Further, a screw hole 39 is formed laterally in the base plate portion 25 of the first member 20. When the first member 20 is on the one end 29□ of the second member 21, this screw hole 39 is adapted to be screwed into a threaded portion 37□ on the tip side of the fine adjustment threaded rod 37. Although not shown in the drawings, a guide groove is formed along the optical axis A in this one end 29□, and a protrusion is correspondingly formed in the lower surface of the base plate 25 of the first member 20, so that the two By fitting, the first member 20 is guided along the optical axis A on the second member 21.

Now, in this fine adjustment mechanism 32', by rotating the knob 3L of the fine adjustment threaded rod 37, the threaded portion 37□ thereof is rotated. Then, the first member 20 slides little by little on the second member 21 while being guided through the threaded hole 39 that is engaged therewith.

As a result, the laser diode 8 of the first member 20 is gradually moved along the optical axis A, and the distance between the second member 2I and the collimating lens 1 is finely adjusted.

Note that after such focus adjustment, as described above, the first member 2
0 to the second member 21 is through the elongated hole 26 of the screw SI.
This is done by screwing into the screw hole 31 through the screw hole 31.

The fine adjustment mechanism 32' shown in FIG. 4 has this structure.

The laser light source unit according to the present invention is as described above.

The operation etc. will be explained below.

Laser imaging device and its laser light source unit.

When adjusting the door lug, adjustments and fixings are performed as follows.

First, the first
A member 20 is attached to a second member 21 in which the collimating lens 1 is incorporated.

That is, the first member 20 is slidably mounted on one end 29z of the pedestal 29 of the second member 21 by being inserted between the guide walls 33.

Then, the first member 20 is moved to one end 29. by operation of the fine adjustment mechanism 32 or 32'. It is slid little by little while being guided by the guide wall 33 above.

As a result, the laser diode 8' of the first member 20 is gradually moved in a plane along the optical axis A of the laser beam 9,
The distance between the second member 21 and the collimating lens 1 is finely adjusted. In other words, the distance between the two is finely adjusted, which requires strict precision, and the focus is adjusted.

Focus adjustment is performed in this way.

Once these adjustments are completed, the following steps will be taken:
Second. It will be like the third one.

First, the first member 20 and the second member 21 are directly fixed. No other member is interposed between the first member 20 and the second member 21. Further, this fixing is performed strongly and stably between the movable planes, and is performed without point contact 9 by tightening, local pressure contact, pressing, etc.

That is, through the elongated hole 26 of the first member 20, the second member 2
The first member 20 is directly fixed to the second member 21 by screwing into each of the screw holes 31 of the first member 20 with a screw. In addition, this fixing is performed by fixing the flat lower surface, which is the sliding surface, of the base plate 25 of the first member 20 to the one end 29□ of the pedestal 29 of the second member 21.
This is done forcefully and stably by making surface contact and pressing the entire surface against the flat upper surface of the holder.

Secondly, in connection with the fixation mentioned in this first point, even if there is a temperature change after the fact, the laser diode 8° first member 2
0. Collimating lens 1. Since the second member 21 and the like expand, contract, expand and contract together, changes in their mutual relative inclination, 9-position π relationship, 2-distance, etc. remain within an allowable range.

That is, the first member 20 is directly in surface contact with the second member 21.
The laser diode 8 is firmly and stably fixed by full-surface pressure contact, and the first member 20 also stably holds the laser diode 8, and the second member 21 also directly and stably incorporates the collimating lens 1. Therefore, even if there is a severe temperature change such as cooling down at night, the relative positional relationship between the laser diode 8 and the collimating lens 1, such as the one interval interval, is relatively little affected.

Thirdly, the temperature change will generally return to that at the time of the original adjustment, and in that case, the relative positional relationship, such as one interval, will definitely return to its original state.

That is, the first member 20. Since the second member 21 and the like are separated as described above, the relative positional relationship between the laser diode 8 and the collimating lens 1.

The spacing etc. will return to their original state, and there will be no change after all.

After completing the adjustment, perform the first step mentioned above. Second. It will be like the third one.

Therefore, while the adjusted state is stably maintained in this way, the laser beam 9 from the laser diode 8 passes through the collimator lens 1, and image formation and the like are performed.

That is, image formation and the like are performed while the focus adjustment is maintained stably.

In the case of a color image forming apparatus as shown in FIG. 7, adjustment is made to superimpose the respective laser beams 9 and to superimpose the convergence spots on their convergence surfaces into one.

In other words, the adjustment to accurately superimpose the three laser beams 9 from the three collimating lenses 1, which have undergone 1M alignment as described above, is performed with strict precision using the reflection prism 09 and the synthesis dichroic prism 11, etc. be exposed.

Even if the overlay adjustment is performed in this way, there will be no fluctuation in the relative positional relationship and spacing between the laser diode 8 and the collimating lens 1, as described above, so the adjustment will be as stable as the focus adjustment described above. Image creation is performed under the maintained conditions.

The above is the explanation of the operation, etc.

In the case of a laser imaging device using a laser beam, the following position adjustment mechanism may be specifically provided as a mechanism for overlapping the laser beams.

That is, a position adjustment mechanism is attached to each of the three first members 20, and the position adjustment mechanism allows the laser beam 9 to be adjusted to the position X in a plane perpendicular to the optical axis A.

Enables fine adjustment in the Y2 dimension. Then, in a color laser image forming apparatus such as a color printer, it becomes possible to appropriately adjust the superposition of the laser beams 9 in the laser light source unit. In other words, this position adjustment mechanism can be used as appropriate to adjust the convergence spots of the laser beams 9 into one, which has the advantage of convenience.

"Other Examples" Next, other embodiments will be described.

FIG. 5 is a perspective view of essential parts showing another embodiment of the laser light source unit according to the present invention. In this embodiment, unlike the previous embodiment, focus adjustment is performed by moving the collimating lens 1.

That is, first, in the second member 21', the main body part 27'' in which the collimating lens 1 is incorporated and the pedestal part 29''
This is not integrally fixed as in the previous embodiment, but is a separate structure.

A guide groove 41 is formed along the optical axis A in this pedestal portion 29', and a protrusion 42 is correspondingly formed on the lower surface of the main body portion 27°. Then, by fitting the two, the main body part 27°
is able to gradually slide on the central portion of the pedestal portion 29° while being guided along the optical axis A.

Also, in this embodiment, unlike the previous embodiment, the first member 20 is integrally formed with one end of the pedestal portion 29'' of the second member 21° (not shown in FIG. 5). ).

On the other hand, wing parts 43 are integrally formed on both sides of the lower part of the main body part 27'' of this second member 21', and these wing parts 4
3 is also in sliding contact with the pedestal portion 29° above. And this Habe 4
3 are each provided with a vertical elongated hole 44. The elongated hole 44 is a through hole whose major diameter is along the optical axis A in the lateral direction.

Further, the pedestal portion 29' is formed with a tapped hole (not shown) at a position that can be overlapped with a part of the elongated hole 44.

By screwing the screw S2 into this screw hole through the elongated hole 44, the main body portion 27' is fixed onto the base portion 29'.

It should be noted that this screw S2 is one in which the diameter of the head is larger than the short diameter of the elongated hole 44, as a matter of course.

The laser light source unit according to another embodiment shown in FIG. 5 is constructed as described above.

The operation etc. will be explained below. At the time of set amplifier, adjustment and fixing are performed as follows.

First, unlike the embodiments described above, the first member 20 is fixed to one end of the base portion 29' of the second member 21'', for example, by fixing.

On the other hand, the second member 21'' has its main body portion 27' mounted on the base portion 29' with its protrusion 42 slidably fitted into the guide groove 41.

The main body portion 27' is slid little by little while being guided by the guide groove 41 by operating an attached fine adjustment mechanism (not shown) or the like.

Therefore, unlike the previous embodiment, the collimating lens l of the second member 21' is gradually moved along the optical axis A of the laser beam 9, so that the distance between it and the laser diode 8 of the first member 20 is increased. Fine adjustments are made and the focus is adjusted.

After that, the first fire. Second. It will be like the third one.

First of all, the first member 20 and the second member 21' are all directly fixed. No other member is interposed between the first member 20 and the second member 21', and this fixation is performed as follows.

That is, in this embodiment, the first member 20 is first fixed to the second member 21' by fixing or the like. On the other hand, in the above-mentioned adjusted second member 21'', the main body portion 27' is fixed on the base portion 29' by screwing the screw S2 through the elongated hole 44. By bringing the surfaces into contact and applying pressure over the entire surface, this is done strongly and stably.

Second and related to this, even if there is a subsequent temperature change, the first member 20. The second member 21°, its main body 27, 2 pedestal 29, etc. expand and contract together.

Since it expands and contracts, changes in the relative positional relationship 9 of each other, etc., remain within a permissible range. Therefore, the laser diode 8
and the positional relationship with collimating lens 1.

The effect on spacing etc. is relatively small.

Thirdly, the post-adjustment temperature generally returns to that at the time of the original adjustment, and in that case, the distance between the two positions, etc., will certainly return to their original values.

In this way, image formation and the like are performed while the adjusted state is stably maintained.

Note that in the case of a color image forming apparatus as shown in FIG. 7, superimposition adjustment of the laser beams 9 is then performed.

Even in this superposition adjustment, there is no change in the relative positional relationship and spacing between the laser diode 8 and the collimating lens 1 as described above, so that the focus adjustment is maintained stably in the same way as in the above-mentioned focus adjustment. Image creation is performed.

The above is an explanation of its operation, etc.

In the embodiment shown in FIG. 5, the other functions and operations of the configuration 1 are the same as those described for the embodiment shown in FIG.

The other embodiment shown in FIG. 4 is like this.

"Effects of the Invention" As explained above, the laser light source unit according to the present invention is fixed by attaching and fixing the first member holding the laser light source to the second member in which the collimating lens is incorporated in a predetermined manner. Alternatively, the adjusted state will be stably maintained regardless of subsequent temperature changes.

Therefore, focus adjustment and laser beam superimposition adjustment in the case of color image formation are reliably prevented from being changed or destroyed, and high-quality images with no out-of-focus or color deviations can be created. The resulting effects are remarkable and significant, such as the problems that existed in this type of conventional example being wiped out.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of a laser light source unit according to the present invention. FIG. 2 is a perspective view of the second member. FIG. 3 is a perspective view of the first member. FIG. 4 is a partially sectional front view showing an example of another fine #A mechanism attached to the second member. FIG. 5 is a perspective view of essential parts showing another embodiment of the laser light source unit according to the present invention. FIG. 6 is a perspective view of essential parts of a conventional laser light source unit. FIG. 7 is a perspective explanatory diagram showing the optical system of the laser imaging device. 1... Collimator lens 8... Laser diode (laser light source) 9... Laser beam 20... First member 21... Second member 21゛... Second member A... Optical axis Figure 1 Figure 5

Claims (1)

[Claims] A laser light source that emits a laser beam, a first member that holds the laser light source, a collimating lens that collimates the laser beam, and a second member that incorporates the collimating lens. , the first member is attached to the second member, and both are relatively movable in a plane along the optical axis of the laser beam in order to adjust the distance between the laser light source and the collimating lens. A laser light source unit characterized in that, in the adjusted state, the first member and the second member are fixed.