JPH0677608A - Laser diode module - Google Patents

Abstract

PURPOSE:To provide a small-sized laser diode module for bar code reader in which aberration can be corrected easily. CONSTITUTION:A laser diode 42 is mounted on a base 41. A lens holder 44 holding a lens 45 is then mounted on the lens holder mounting section 43 of the base 41. Upon turning an adjusting screw 47, the lens holder 44 turns in the direction of an arrow C to incline the lens 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a module incorporated in a bar code reader, which module uses a laser diode as a light source.

The bar code reader 1 has a schematic structure shown in FIG. The laser light 3 emitted from the light source module 2 is scanned by the scanning optical system 4 in the direction of arrow 5,
Scan the barcode 7 on the product 6. The reflected laser light 8 reflected by the bar code 7 and intensity-modulated is detected by the photodetector 9
And the photodetector 9 outputs an electric signal. The electric signal is processed by the processing circuit 10 and the barcode reading data is output.

In recent years, bar code readers have been reduced in size. Along with this, the light source module is also required to be downsized. Conventionally, a He-Ne laser has been used as a laser light source, but a laser diode has come to be used for miniaturization.

As shown in FIG. 24, the laser diode 11 usually has an astigmatic difference a of about 10 μm. This astigmatic difference varies about ± 5 μm for each laser diode. Due to the presence of the astigmatic difference a, the far-field image 1 of the laser light 12 emitted from the laser diode 11 is generated.
3 has an elliptical shape with a long axis 14 in the vertical direction and a short axis 15 in the horizontal direction.

Hereinafter, when the laser beam 12 is converged by the lens 16, the vertical laser beam 12V in the vertical plane of the laser beam 12 is focused on the vertical focus FV.
That is, the focus of the horizontal laser light 12H in the horizontal plane is called the horizontal focus FH.

When the astigmatic difference a varies by about ± 5 μm, the distance b between the vertical focus FV and the horizontal focus FH varies by ± several tens mm. If the distance b varies, the reading performance varies for each bar code reader, which is not preferable. Therefore, in the laser diode module using the laser diode as the light source, it is necessary to have a configuration that can be adjusted so as to eliminate the variation in the distance b.

Further, the laser diode module needs to be small.

[0008]

2. Description of the Related Art FIG. 25 shows an example of a conventional laser diode module 20. The module 20 includes a main body 21, a laser diode 22, a collimator lens 2
3, Vertical cylindrical lens 2
4, Horizontal cylindrical lens 2 that squeezes horizontally
5 are arranged side by side on the optical axis 26. The positions of the lenses 24 and 25 can be adjusted independently in the direction along the optical axis 26. By adjusting the position of the lens 25 in the direction of the optical axis 26, the position of the horizontal focus FH is adjusted. Also, the position of the vertical focus FV is adjusted by adjusting the position of the lens 26 in the same direction as the optical axis 26.

[0009]

A plurality of lenses 23, 2
Since modules 4 and 25 are provided, the module 20 has a large size and is expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a laser diode module which is compact and simple in construction.

Here, for convenience of explanation, a phenomenon which is a clue to the solving means of the present invention and which is found by the present inventor will be described.

As shown in FIGS. 26A and 26B, the present inventor tilted the lens 30 with respect to the horizontal axis 31 and found that the beam waist position P of the horizontal beam 32H was P.
It has been found that H does not change and the position PV of the beam waist of the vertical beam 32V moves toward PV1 in the direction approaching the lens 30. Also, the inclination angle θ of the lens 30
It was also found that there is a relationship indicated by the line I in FIG. 27 between the beam waist position PV and the displacement amount.

[0013]

According to a first aspect of the present invention, in a laser diode module for emitting a laser beam, a base to which the laser diode is fixed and a lens for transmitting the laser beam emitted from the laser diode are fixed. A lens holder attached to the base and a lens holder rotation mechanism that rotates the lens holder as a whole with respect to the base in order to incline the lens.

According to a second aspect of the present invention, in a laser diode module that emits laser light, a base to which a laser diode is fixed and the base is attached to the base,
A lens holder having a plate-shaped portion that can be flexibly deformed, and a lens through which the laser light emitted from the laser diode passes is fixed to the plate-shaped portion, and the plate-shaped portion is bent to tilt the lens. It is configured to include a plate-shaped portion bending mechanism.

According to a third aspect of the present invention, in a laser diode module that emits laser light, a base to which the laser diode is attached has a plate-shaped portion that can be flexibly deformed, and the plate-shaped portion is emitted from the laser diode. A lens through which laser light is transmitted is fixed, and a plate-shaped portion bending mechanism that bends the plate-shaped portion is provided to incline the lens.

According to a fourth aspect of the present invention, the lens holder of the first or second aspect is configured such that the position thereof can be adjusted back and forth along the base.

According to a fifth aspect of the present invention, the laser diode of the third aspect is configured such that the position thereof can be adjusted back and forth along the base.

According to a sixth aspect of the present invention, in a laser diode module for emitting a laser beam, a laser diode, a first lens holder for fixing a lens through which the laser beam emitted from the laser diode passes, and a lens holder for rotating the lens holder. A second holder that holds the laser diode and a base that holds the second holder and the laser diode, and the lens is inclined with respect to the optical axis through which the laser light propagates. is there.

According to a seventh aspect of the present invention, the first lens holder has a cylindrical shape, and the second holder has a cylindrical hole for accommodating the cylindrical first lens holder. Is.

According to an eighth aspect of the present invention, the laser diode module further has a member for fixing the first lens holder.

According to a ninth aspect of the present invention, the cylindrical first lens holder has a groove with which a jig is engaged.

According to a tenth aspect of the present invention, the diameter of the end portion of the cylindrical hole of the second holder is smaller than the diameter of the cylindrical first lens holder, and the diameter of the first lens holder of the first lens holder is small. The end portion is in contact with the end portion of the second holder.

The invention of claim 11 is characterized in that the laser diode module further comprises a spring having one end attached to the base and the other end engaging with the second holder.

According to a twelfth aspect of the present invention, in a laser diode module that emits laser light, a laser diode, a laser diode holder that holds the laser diode, a lens through which the laser light emitted from the laser diode passes, and the lens. A lens holder for holding, and a base for holding the laser diode holder and rotatably holding the lens holder,
The lens is configured to be tilted with respect to the optical axis through which the laser light propagates.

According to a thirteenth aspect of the present invention, the lens holder has a cylindrical shape, and the base has a cylindrical hole for accommodating the cylindrical lens holder.

According to a fourteenth aspect of the present invention, the laser diode module further comprises a spring having one end attached to the base and the other end engaging with the laser diode holder.

[0027]

According to the lens holder rotating mechanism of the first aspect of the present invention, the lens holder is tilted for each lens holder.

According to the plate-shaped portion bending mechanism of the second aspect, the lens holder is fixed and the lens is tilted.

The plate-like portion of claim 3 is provided in a part of the base,
The configuration in which the plate portion is bent acts to stabilize the work of tilting the lens.

The lens holder or the laser diode position adjusting device of the fourth and fifth aspects works so as to enable horizontal focusing.

According to the sixth and the twelfth aspects, the lens holder is rotatably held with respect to the second holder and the base, respectively.

In the present invention, since the lens holder has a cylindrical shape, the inclination of the lens can be easily adjusted.

The member of claim 8 can securely fix the lens holder.

The groove of claim 9 facilitates the adjustment of the inclination of the lens.

According to the structure of claim 10, the lens holder can be surely positioned in the second holder.

According to the eleventh aspect of the present invention, the second holder is securely fixed to the base.

In the thirteenth aspect, since the lens holder has a cylindrical shape, the inclination of the lens can be easily adjusted. The spring of claim 14 securely fixes the laser diode holder to the base.

[0038]

1 (A) and 1 (B) are a front view and a side view of a laser diode module 40 according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the first embodiment. The laser diode module 40 includes a base 41 having a first vertical portion 43c to which a laser diode 42 is fixed. Further, the base 41 has a lens holder mounting portion 43. The lens holder mounting portion 43 has a first horizontal lens holder mounting portion 43a and a second vertical portion 43b. The surfaces of these portions 43a and 43b are flat surfaces with high precision.

The lens holder 44 is substantially L-shaped and has a vertical portion 44a and a horizontal portion 44b. The lens 45 is fixed to the vertical portion 44a. The penetrating female screw 46 is provided at the end of the horizontal portion 44b of the lens holder 44. The adjusting screw 47 for rotating the lens holder 44 is
Engage with the female thread 46. The end of the adjusting screw 47 can protrude from the bottom surface of the horizontal portion 44b of the lens holder 44.

A horizontally elongated slot 48 is formed in the base 41.
Is formed on the vertical wall 41a. The male screw 49 is formed at an end portion where the vertical portion 44a and the horizontal portion 44b of the lens holder 44 are connected to each other, and thus engages with the screw 50.

The leaf spring 51 presses the lens holder 44 onto the lens holder mounting portion 43 of the base 41.

The adjustment work of the lens holder 44 is performed as follows. As shown in FIG. 1A, an optical bench 60 and a beam diameter measuring instrument 61 are used for this adjustment work.
In the first step of the adjustment work, the laser diode 42
The base 41 and the measuring device 61 are placed on the optical bench 60 so that the distance between the measuring device 61 and the measuring device 61 becomes a predetermined distance L.

In the second step of the adjustment work, horizontal focusing is performed as follows. That is, while the adjusting screw 47 is not protruding from the lower surface of the horizontal portion 44b of the holder 44 (when the lens 45 is not inclined), the screw 49 is loosened, and the holder 44 is moved while monitoring the output of the measuring device 61. Move along the base 41 in the direction of arrow A,
Find the position where the beam diameter is minimum. When this position is obtained, tighten the screw 49 to attach the holder 44 to the base 41
Temporarily fix to.

In the third step of the adjustment work, vertical focusing is performed. First, the measuring device 61 is moved in the direction of arrow B and fixed at a predetermined position. After that, the screw 47 is turned in the screwing direction so as to protrude from the horizontal portion 44b. As a result, the screw 47 pushes the lens holder mounting portion 43a, the holder 44 is rotated in the direction of the arrow C, the lens 45 is rotated, and the lens 45 is inclined at the angle θ with respect to the vertical plane.

Here, since the holder 44 rotates together with the holder 44, no stress acts on the lens 45. That is, the lens 45
Tilts without any stress. The operation of screwing the screw 47 is performed while monitoring the measurement value of the measuring device 61, and is performed until the measurement value becomes the minimum. In this state, the screw 49 is tightened to fix the holder 44 to the base 41. With the above, the adjustment is completed.

As shown in FIG. 3A, the corners of the holder 44 are chamfered, and chamfered portions 55 are formed. Therefore, in the third step, the holder 44
Rotates about the end 56 of the chamfer 55 in the direction of arrow C. The chamfered portion 55 has a size such that the end portion 56 corresponds to a portion immediately below the female screw portion 50. Chamfer 55
3B, the female screw portion 50 moves as shown in FIG. 3B, the amount of movement in the vertical direction increases, and the inclination angle of the holder 44 is extremely large in relation to the elongated hole 48. It is not preferable because it is limited to a slight angle. On the other hand, when the chamfered portion 55 is provided as in this embodiment, the female screw portion 50 is formed.
Moves as shown in FIG. 3A, and the amount of movement in the vertical direction is small. Therefore, the holder 44 can be rotated about 10 degrees even if the elongated hole 48 is provided, and vertical focusing can be performed without any trouble.

The leaf spring 51 attaches the holder 44 to the bottom surface 43.
Since the holder 44 is pressed onto the surface a, the holder 44 is rotated around the end 54 with the end 56 being in contact with the bottom surface 43a. Therefore, the adjustment of the inclination angle of the lens 45 can be performed accurately and stably.

Further, as shown in FIG. 3C, an adjusting screw 47 is provided on the base 41, and by screwing into the female screw 46a, the adjusting screw 47 projects from the lens holder mounting portion 43a and pushes up the horizontal portion 44a of the lens holder 44. It may be configured as follows.

4 and 5 show a laser diode module 40A according to a second embodiment of the present invention. The module 40A includes a base 41A having an elongated hole 71. The long hole 71 is provided in the vertical portion 41 of the base 41A and is long in the horizontal direction. The lens holder 44 is rotatable in the arrow C direction. The laser diode 42 is provided on the laser diode holder 70, and it can be moved on the base 41A along the elongated hole 71 in the arrow A direction. The base 41A shown in FIGS. 4 and 5 is a vertical portion 43c of the base 41 shown in FIGS. 1A and 1B and FIG.
Not equipped. The fixing screw 72 fixes the laser diode holder 70 at a predetermined position. This screw 72 has a long hole 7
1 and is formed in the laser diode holder 70 to engage the screw.

The position of the horizontal focal point is adjusted by moving the laser diode holder 70. The position of the vertical focus can be adjusted using the screw 47, as in the first embodiment described above.

FIGS. 6A, 6B and 7 show a laser diode module 40B according to the third embodiment of the present invention. In the figure, the same parts as those shown in the previous figures are designated by the same reference numerals.

The lens holder 44A used in place of the lens holder 44 described above has a first vertical plate-like portion 81a.
And a second vertical portion 81b. Lens holder 44A
Is an integrally molded member, and the vertical portions 81a and 81b are integrally molded and face each other via the slit 80.
The second vertical portion 81b has a through hole 80b extending in the horizontal direction and allows the laser light from the lens 45 to pass therethrough. The penetrating female screw 84 is provided on the second vertical portion 81b and is located above the through hole 80b. Male thread 82 Female thread 84
And is brought into contact with the upper portion of the first vertical portion 81a. By turning the screw 82, the screw 82 slowly pushes the first vertical portion 81a, which causes the first vertical portion 81a to tilt and, as a result, the lens 45 to tilt by the angle θ. The slit 80 makes the vertical portion 81a flexible. This allows the vertical focus to be adjusted.

The horizontal focus can be adjusted in the same way as in the first embodiment. That is, the lens holder 44A can be slid on the lens holder mounting portion 43a and is fixed at the place where the minimum beam diameter is obtained.

FIG. 8 is a diagram showing a first modification 44B of the lens holder 44A used in the third embodiment. Figure 8
In the figure, the same parts as those shown in the above-mentioned figures are designated by the same reference numerals. A groove (constricted portion) 90 is formed on the outer ridge of the first vertical portion 81a.
The groove 90 makes the first vertical portion 81a easy to bend.

FIG. 9 is a diagram showing a second modification 44C of the lens holder 44A used in the third embodiment. Figure 9
In the figure, the same parts as those shown in the above-mentioned figures are designated by the same reference numerals. The second vertical portion 81b is
It has a horizontal protrusion 81 b ′ located on the slit 80. The male screw 91 vertically penetrates through the protruding portion 81b 'and projects from the protruding portion 81b'. A female screw that is screwed into the male screw 91 is formed on the protrusion 81b '. The adjusting screw 91 is turned from above to push the wedge 92 into the slit 80 to bend the plate portion 81. This work is from above, and the adjustment work can be performed without interrupting the laser light.

FIG. 10 is a diagram showing a third modification 44D of the lens holder 44A used in the third embodiment. In FIG. 10, the same parts as those shown in the above-mentioned figures are designated by the same reference numerals. The lens holder 44D of FIG. 10 has a configuration in which a rod 93 having an elliptical cross section is rotated in the slit 80 to bend the plate-shaped portion 81.

A laser diode module 40C according to a fourth embodiment of the present invention will be described with reference to FIGS. 11A and 11B and FIG. In these figures, the same parts as those shown in the above figures are designated by the same reference numerals.

The lens holder 44B-1 has vertical portions 81a and 81b. The slope portion 95 is formed at the corner of the vertical portion 81b. One end of the vertical portion 41a of the base 41
The leaf spring 96 embedded in the
5 is engaged. The leaf spring 96 presses the slope portion 95 and biases the spring in the direction of arrow 97 shown in FIG. As a result, the lens holder 44B-1 is pressed against the lens holder mounting portion 43a and the vertical portion 43b. After the position adjustment, the lens holder 44B-1 is adhered and fixed to the base 41.

13 and 14 show a laser diode module 40D according to the fifth embodiment of the present invention. In these figures, the same parts as those shown in the above figures are designated by the same reference numerals. The base 41B is
It has a first vertical plate-like portion 101a and a second vertical portion 101b, which are separated by a slit 100. The lens 45 is fixed to the first vertical portion 101a. Since the male screw 102 is formed on the second vertical portion 101b, the male screw 102 is screwed into the screw and protrudes therefrom. The through hole 103 through which the laser light from the lens 45 passes is formed in the second vertical portion 10
It is provided in 1b. The screw 102 is in contact with the upper portion of the vertical portion 101a. By rotating the screw 102, the vertical portion 101a is bent, and the lens 45 can be tilted. The laser diode 42 is held by the laser diode holder 70 used in the second embodiment. Since the adjusting screw 102 is provided on the base 41B fixed to the optical bench, the screw 102 can be easily handled.

Next, FIGS. 15A and 15B and FIG.
A laser diode module 40E according to a sixth embodiment of the present invention will be described with reference to FIG. The laser diode module 40E includes a first vertical portion 111a and a second vertical portion 111a.
It has a base 111 having a vertical portion 111b and a holder mounting portion 111c. First and second vertical portions 111a
And 111b are provided so as to be orthogonal to each other. The laser diode 42 is fixed to the second vertical portion 111b.

The holder 114 is slidably placed on the holder mounting portion 111c. The leaf spring 113 is attached to the holder 11
The base 4 is fixed on the holder mounting portion 111c in a state of being in contact with the first vertical portion 111a of the base 111. Leaf spring 11
One end of 3 is embedded in the first vertical portion 111a, and the other end engages with the edge of the holder 114.

The holder 114 has a large cylindrical through hole 11.
7 and two small cylindrical through holes 115 and 116. The through holes 115 and 116 are provided on both sides of the through hole 117 and are connected to the through hole 117. The laser light from the laser diode 42 enters the through hole 116. The through hole 177 houses the cylindrical lens holder 118 and has a width substantially the same as that of the holder 114. The lens holder lens 118 has a through hole 120. Lens holder 11
When 8 is inserted into holder 114 and put in place, through hole 120 connects to through holes 115 and 116. The lens 45 is in the through hole 120 of the lens holder 118. The laser light from the through hole 116 passes through the lens 45 and is emitted through the through hole 115. A linear groove is formed on the entire surface of the lens holder 118. This groove 11
The lens 45 can be tilted with respect to the laser light emitted from the laser diode 42 by rotating the lens holder 118 in the holder 114 using a jig that engages with 9. This allows the vertical focus to be adjusted. The horizontal focus can be adjusted by moving the holder 114 in the A direction.

Next, FIGS. 17A and 17B and FIG.
A first modification 40F of the laser diode module 40E according to the sixth embodiment of the present invention will be described with reference to FIG. In these figures, the same parts as those shown in FIGS. 15A and 15B and FIG. 16 are designated by the same reference numerals.

The laser diode module 40F shown in FIGS. 17A and 17B and FIG. 18 has a leaf spring 126 attached to the holder 114 by a male screw 127. The leaf spring 126 presses the lens holder 118 against the first vertical portion 111 a of the base 111. This can prevent the lens holder 118 and the lens 45 from being displaced in the direction perpendicular to the optical axis of the laser diode 42.

FIGS. 19A and 19B and FIG.
It is a figure which shows the 2nd modification 40G of the laser diode module 40E by the 6th Example of this invention. In addition,
In these figures, the same parts as those shown in the above figures are designated by the same reference numerals.

The laser diode module 40G includes a holder 114A having a through hole 117A and the through holes 115 and 116 described above. The lens holder 118 is
It is inserted into the through hole 117A from the side of the holder 114A that abuts the first vertical portion 111a of the base 111. The diameter of the through hole 117A outside the through hole 117A is smaller than the diameter of the lens holder 118. Therefore, the circular edge of the lens holder 118 contacts the inner wall of the through hole 117A of the holder 114A. As shown in FIG. 20, when the holder 114A into which the lens holder 118 has been inserted is placed on the holder placement part 111c, the leaf spring 113 will not move.
14A is pressed against the first vertical portion 111a of the base 111 so that the end surface of the lens holder 118 facing the groove 119 is pressed by the first vertical portion 111a of the base 111. As a result, the lens holder 11 is moved from a predetermined position where the optical axis of the laser diode 42 matches the optical axis of the lens 45.
8 and the lens 45 can be prevented from being displaced.
The vertical focus can be adjusted by turning the lens holder 118 with a jig.

Next, FIGS. 21A and 21B and FIG.
A third modification 40H of the laser diode module 40E according to the sixth embodiment of the present invention will be described with reference to FIG. In these figures, the same parts as those shown in the above figures are designated by the same reference numerals.

The laser diode module 40H shown in FIGS. 21A and 21B and FIG. 22 includes a base 131 having a hole 136. The lens holder 118 is inserted into the hole 136. When the lens holder 118 is inserted into the hole 136 and put in place, the hole 13
2 is connected to the through hole 120 of the lens holder 118. As shown in FIG. 21A, a hole 133 through which the laser light emitted from the laser diode 42 passes is formed in the base 131. The base 131 has a laser diode holder housing space defined by the vertical portion 131a and the laser diode mounting surface 131b. A block-type laser diode holder 141 that can move in the A direction on the laser diode mounting surface 131b holds the laser diode 42. The leaf spring 135 whose one end is embedded in the vertical portion 131a of the base 131 engages with the edge of the holder 141,
This is pressed against the vertical portion 131a. The horizontal focus can be adjusted by moving the laser diode holder 141 in the A direction. The vertical focus is on the lens holder 1.
It can be adjusted by turning 18.

[0069]

As described above, according to the present invention, it is possible to provide a laser diode module that is small in size and can easily correct aberrations. More details are as follows.

According to the invention of claim 1, the lens can be tilted without applying any stress to the lens.
Further, despite the variation in the astigmatic difference of the laser diode, the dimension between the focus position of the horizontal laser light and the focus position of the vertical laser light can be made constant,
Moreover, it is possible to reduce the size considerably compared to the conventional one.
Furthermore, it can be inexpensive.

According to the second aspect of the invention, the lens can be tilted while the lens holder is fixed. Also,
Despite the variation in the astigmatic difference of the laser diode, the size between the focus position of the horizontal direction laser light and the focus position of the vertical direction laser light can be made constant, and moreover, compared to the conventional case. The size can be reduced, and the cost can be reduced.

According to the third aspect of the present invention, since the work involves operating a part of the base, the work is easier than the case where the work is performed on a holder that is smaller in size than the base.
Further, despite the variation in the astigmatic difference of the laser diode, the dimension between the focus position of the horizontal laser light and the focus position of the vertical laser light can be made constant,
Moreover, it is possible to reduce the size considerably compared to the conventional one.
Furthermore, it can be inexpensive.

According to the inventions of claims 4 and 5, horizontal focusing can be easily performed.

According to the invention of claim 6, since the lens holder for housing the lens is rotatably held by the second holder, the same effect as in claim 1 can be obtained.

According to the invention of claim 7, since the lens holder has a cylindrical shape, the inclination of the lens can be easily adjusted.

According to the invention of claim 8, the lens holder can be securely fixed by the member.

According to the ninth aspect of the invention, since the groove with which the jig is engaged is provided, it is possible to easily adjust the inclination of the lens.

According to the tenth aspect of the present invention, the lens holder can be reliably positioned in the second holder.

According to the invention of claim 11, by the spring,
The second holder can be securely fixed to the base.

According to the twelfth aspect of the invention, since the lens holder for accommodating the lens is rotatably held by the base, the same effect as that of the first aspect can be obtained.

According to the thirteenth aspect of the present invention, since the lens holder is cylindrical, it is possible to easily adjust the inclination of the lens.

According to the fourteenth aspect of the invention, the laser diode holder can be securely fixed to the base by the spring.

[Brief description of drawings]

FIG. 1 is a diagram showing a laser diode module according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the laser diode module shown in FIG.

FIG. 3 is a diagram showing a displacement of a screw hole when a lens holder is rotated and a modification of the first embodiment in FIG.

FIG. 4 is a diagram showing a laser diode module according to a second embodiment of the present invention.

5 is a perspective view of a laser diode module according to a second embodiment shown in FIG.

FIG. 6 is a diagram showing a laser diode module according to a third embodiment of the present invention.

7 is a perspective view of a laser diode module according to a third embodiment shown in FIG.

FIG. 8 is a diagram showing a first modification of the holder.

FIG. 9 is a diagram showing a second modification of the holder.

FIG. 10 is a diagram showing a third modification of the holder.

FIG. 11 is a diagram showing a laser diode module according to a fourth embodiment of the present invention.

12 is a perspective view showing a laser diode module according to a fourth embodiment shown in FIG.

FIG. 13 is a diagram showing a laser diode module according to a fifth embodiment of the present invention.

14 is a perspective view showing a laser diode module according to a fifth embodiment shown in FIG.

FIG. 15 is a diagram showing a laser diode module according to a sixth embodiment of the present invention.

16 is a perspective view showing a laser diode module according to a sixth embodiment shown in FIG.

17 is a diagram showing a first modification of the laser diode module shown in FIGS. 15 and 16. FIG.

FIG. 18 is a perspective view of the first modification example shown in FIG. 17.

FIG. 19 is a diagram showing a second modification of the laser diode module shown in FIGS. 15 and 16;

FIG. 20 is a perspective view of a second modification example shown in FIG. 19.

21 is a diagram showing a third modification of the laser diode module shown in FIGS. 15 and 16. FIG.

22 is a perspective view of a third modification example shown in FIG. 21. FIG.

FIG. 23 is a diagram showing a schematic configuration of a barcode reader.

FIG. 24 is a diagram for explaining the astigmatic difference of the laser diode and the vertical position shift caused thereby.

FIG. 25 is a diagram showing a conventional example of a laser diode module.

FIG. 26 is a diagram for explaining displacement of the beam waist position by inclining the lens.

FIG. 27 is a diagram showing a relationship between a lens tilt angle and a displacement amount of a beam waist position.

[Explanation of symbols]

40, 40A, 40B, 40C, 40D Laser diode module 41, 41A, 41B Base 42 Laser diode 43 Lens holder mounting part 43a Bottom surface 43b Side surface 44, 44A, 44B, 44B-1, 44C, 44D
Lens holder 44a Vertical part 44b Horizontal part 45 Lens 46 Female screw 47,82,91,102 Adjustment screw 48,71 Long hole 49,72 Fixing screw 50 Female screw part 51,96 Leaf spring 55 Chamfer 60 Optical bench 61 Beam diameter measuring instrument 70 Laser diode holder 80,100 Slit 81,101 Vertical plate portion 90 Groove portion 92 Wedge 93 Elliptical bar 95 Slope portion 111 Base 113 Leaf spring 114 Holder 118 Lens holder 119 Groove 126 Leaf spring 127 Screw 131 Base 135 plate Spring 141 Laser diode holder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimitsu Kumagai 1015 Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Yuzo Yamazaki, 1015, Kamedotachu, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Masanori Okawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (14)

[Claims] 1. A laser diode module for emitting a laser beam, wherein a base (41) to which a laser diode (42) is fixed is provided.
A lens (45) through which the laser light emitted from the laser diode is transmitted is fixed, and a lens holder (44) attached to the base, and the lens holder as a whole in order to tilt the lens. Lens holder rotating mechanism (47) for rotating with respect to
A laser diode module characterized by having the following structure. 2. A laser diode module for emitting laser light, comprising: a base (41) to which a laser diode (42) is fixed.
A lens attached to the base and having a plate-shaped portion (81) that can be flexibly deformed, and a lens (45) through which the laser light emitted from the laser diode passes is fixed to the plate-shaped portion. A laser diode module comprising a holder (44A) and a plate portion bending mechanism (82) for bending the plate portion so as to tilt the lens. 3. A laser diode module for emitting laser light, comprising: a base (4) having a laser diode (42) attached thereto.
1B) has a plate-shaped portion (101) that can be flexibly deformed, and a lens (45) through which laser light emitted from the laser diode passes is attached to the plate-shaped portion, and the lens is tilted. Therefore, the laser diode module is characterized in that a plate-shaped portion bending mechanism (102) for bending the plate-shaped portion is provided. 4. The lens holder according to claim 1 or 2,
44A) is a laser diode module having a structure in which the position can be adjusted back and forth along the base. 5. The laser diode (42) of claim 3.
Is a laser diode module having a structure in which the position can be adjusted back and forth along the base (41B). 6. A laser diode module for emitting laser light, comprising: a first lens holder (11) for fixing a laser diode (42) and a lens (45) through which laser light emitted from the laser diode passes.
8), a second holder (114) for rotatably holding the lens holder (118), and a base (111) for holding the second holder and the laser diode (42), The laser diode module, wherein the lens is inclined with respect to an optical axis through which the laser light propagates. 7. The first lens holder (118) is cylindrical and the second holder (114) is a cylindrical hole (117) for accommodating the cylindrical first lens holder (118). 7. The laser diode module according to claim 6, further comprising: 8. The laser diode module according to claim 7, wherein the laser diode module further comprises members (126, 127) for fixing the first lens holder (118). 9. The cylindrical first lens holder (11)
Laser diode module according to claim 7 or 8, characterized in that 8) has a groove (119) in which a jig is engaged. 10. The diameter of the end of the cylindrical hole (117) of the second holder (114) is smaller than the diameter of the cylindrical first lens holder (118). 10. The laser diode module according to claim 7, wherein an end portion of the lens holder is in contact with an end portion of the second holder. 11. The laser diode module further comprises a spring (11) having one end attached to the base (111) and the other end engaging the second holder (114).
The laser diode module according to claim 7, further comprising 3). 12. A laser diode module for emitting laser light, comprising: a laser diode (42), a laser diode holder (141) holding the laser diode (42), and a lens through which laser light emitted from the laser diode passes. (45) and a lens holder (118) for holding the lens (45)
And a base (131) which holds the laser diode holder (141) and rotatably holds the lens holder (118). The lens is tilted with respect to the optical axis through which the laser light propagates. A laser diode module characterized in that 13. The lens holder (118) is cylindrical and the base (131) has a cylindrical hole (136) for accommodating the cylindrical lens holder (118). Item 12. A laser diode module according to item 12. 14. The laser diode module further comprises a spring (135) attached to the base (131) at one end and engaging the laser diode holder (141) at the other end. 12. The laser diode module according to 12 or 13.