JPH08327867A - Light projection optical device - Google Patents

Abstract

PURPOSE: To provide a light projection optical device in which a burr caused by the press-fitting of a laser light source in a supporting member is easily removed and the generation of the burr is extremely reduced. CONSTITUTION: This light projection optical device is provided with the laser light source 1, a collimator lens 2 making a laser beam emitted from the laser light source 1 parallel beams, a lens barrel 5 holding the lens 2, and the almost cylindrical supporting member 4 for mounting a lens barrel 5 press-holding a laser light source 1 at one end part and the collimator lens 2 at the other end part. At least one through-hole is bored on the side surface of the cylindrical part of the supporting member 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser beam collimator unit used in an apparatus for recording an image by scanning a recording medium with a laser beam modulated by an image signal, or an optical disk pickup unit using a semiconductor laser. Such as ejection optical device.

[0002]

2. Description of the Related Art In recent years, a recording device such as a laser beam printer which scans a laser beam to record an image has been widely used. A laser scanning device used in a conventional image recording device will be described below with reference to FIG.

In the schematic configuration diagram of FIG. 9, 41 is a semiconductor laser, 42 is a collimator lens, 43 is a polygon mirror which is a deflector, 44 is an image forming optical system, 45 is a photosensitive drum which is a recording medium, and an image signal. The beam from the semiconductor laser 41 modulated by is collimated by the collimator lens 42, is deflected by the deflector 43, is imaged on the recording medium 45 by the imaging lens 44, and is scanned.
Here, since the emitted light of the semiconductor laser has a property of radially spreading from the light emitting point, when it is used in a laser unit such as a laser beam printer, it is common to use a collimator lens to form a parallel light beam.

FIGS. 10A and 10B show an example of such a conventional laser unit. Reference numeral 51 denotes a semiconductor laser, which is mounted in a hollow holder 58 formed in a substantially convex shape in a vertical section.

The conventional adjusting means of the laser unit will be described below. The XY adjustment (optical axis adjustment) of the base 54 of the semiconductor laser is performed so that the optical axis of the collimator lens 52 and the optical axis of the semiconductor laser 51 coincide with each other. In this case, spring-loaded screws 55 and 56 are used to fix the base 54 and the holder 58. The holder 58 of the laser unit is fixed to the reference portion of the adjustment jig. The XY adjustment is performed by the fixed holder 58.
On the other hand, the base 54 is slightly moved in the XY directions.
That is, the semiconductor laser 51 is moved by a small amount in the XY direction with respect to the collimator lens 52. Before adjustment
The spring-loaded screws 55 and 56 are loose (semi-fixed state)
Then, the base 54 and the holder 58 are fixed. After the adjustment is completed within the predetermined range, the spring-loaded screws 55 and 56 are tightened to be firmly fixed. After that, the collimator lens barrel 53
Is moved in the optical axis direction (Z direction) by a small amount, and after the adjustment is completed within a predetermined range, the lens barrel 53 and the holder 58 are bonded and fixed, and the optical adjustment is completed.

[0006]

However, such a conventional configuration has the following problems. (1) At least three parts, that is, the base, the holder, and the lens barrel, are required to perform the optical axis adjustment and the focus adjustment. (2) When the screw is retightened and fixed after the optical axis adjustment, the base moves along the rotation direction of the screw and moves from the adjustment standard range. (3) As a measure against (2) above, on the adjustment tool side, when tightening and tightening the screw, the base is pressed firmly against the holder,
The rotation of the holder and the base is prevented by the frictional force generated on the fixed surface. In this case, the structure of the adjusting jig becomes complicated. Further, since the pressing force becomes large, the holder deforms, and when the adjustment jig pressing force is released after the adjustment is completed, the deformation returns and deviates from the adjustment value. (4) As a measure for the above (3), there is a method of finishing the surface accuracy of the joining surface of the base and the holder by polishing or the like, but this increases the cost. (5) As a measure against the above (1) to (4), there is a method of directly pressing the semiconductor laser into the holder, adjusting the collimator lens in the three-dimensional direction and fixing the collimator lens in the holder. In this method, since the semiconductor laser is arranged in the recessed position of the holder, it is difficult to remove burrs generated by press fitting the semiconductor laser. Further, recently, there is a severe demand for cost reduction of parts, and a resin is sometimes used for a holder which is conventionally a metal. When the resin is press-fitted, burrs generated at the time of press-fitting are easily separated from the holder, and there is a risk of sticking to the laser beam emission window of the semiconductor laser 1 and impairing the optical performance.

The present invention has been made in order to solve the problems of the prior art as described above, and its object is to provide a laser light source, a collimator lens for collimating laser light emitted from the laser light source, and a collimator lens. Ejection optics having a lens barrel holding the collimator lens, and a substantially cylindrical support member on one end of which the laser light source is press-fitted and held and at the other end of which a lens barrel holding the collimator lens is mounted. In the device,
By providing at least one through hole in the side surface of the cylindrical portion of the support member, it is possible to prevent optical illness from being adversely affected by burrs generated when the laser light source is press-fitted.

By providing the support member inner wall side opening of at least one of the holes at a position facing the side surface of the laser cap press-fitted into the support member,
The purpose is to generate more air flow near the burr and improve the burr removability.

By providing a flat step in the middle of at least one of the holes, the tip of the pipe for feeding clean air through the filter can be abutted against the step of the hole. The purpose is to remove burrs without the need for large facilities such as clean rooms.

By providing a plurality of holes radially in the radial direction of the support member, the efficiency of burr removal is improved and the working time is shortened. Furthermore, since there are multiple holes, suction from some holes and intake of outside air from other holes,
The purpose is to enable the burr removal work even after three-dimensionally bonding the lens barrel holding the collimator lens.

By closing the hole with a label, it is possible to reduce the cost increase for closing.

[0012] It is to minimize the cost increase due to the blockage by using the label as a label used for manufacturing control.

By using at least one of the holes as a mounting reference hole for the emission optical device, the hole can be closed without increasing the cost. Moreover, since the mounting reference holes can be arranged so as to intersect perpendicularly to the optical axis of the laser, it is possible to reduce the mechanical tolerance and improve the assembling accuracy of the emission optical device.

A laser light source, a collimator lens for collimating the laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and a substantially cylindrical support member for press-fitting and holding the laser light source are provided. In the emission optical device, a groove is provided in a part of the inner wall of the support member, and the groove forms a cutout portion on the laser light source press-fitting side end surface of the support member to define the inside and the outside of the support member even after the laser light source is press-fitted. By making it communicate with each other, it is possible to reduce the burr generation area and to generate an air flow when sucking the burr.

The angle at the intersection of the notch and the opening of the support member is an obtuse angle of 135 degrees or more, and the corner is R, so that the brittle portion of the corner is eliminated and the occurrence of burrs is reduced. To suppress.

[0016]

In order to achieve the above object, according to the present invention, a laser light source, a collimator lens for collimating laser light emitted from the laser light source, and a collimator lens. In an emission optical device having a lens barrel holding, and a substantially cylindrical support member on which the laser light source is press-fitted and held at one end, and the lens barrel holding the collimator lens is mounted at the other end. At least one through hole is provided on a side surface of the cylindrical portion of the support member.

The opening of at least one of the holes on the side of the inner wall of the support member is provided at a position facing the side surface of the cap of the laser light source press-fitted into the support member.

A flat step is provided in the middle of at least one of the holes.

A plurality of the holes may be provided radially in the radial direction of the support member.

The hole is closed with a label.

[0021] The above-mentioned label is a label used for manufacturing control.

At least one of the holes is a mounting reference hole of the emission optical device.

It has a laser light source, a collimator lens for collimating the laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and a substantially cylindrical support member for press-fitting and holding the laser light source. In the injection optical device, a groove is provided in a part of the inner wall of the support member, and the groove forms a cutout portion on the laser light source press-fitting side end surface of the support member to communicate the inside and the outside of the support member even after the laser press-fitting. It is characterized in that it is adapted to.

It is characterized in that the angle at the intersection of the notch and the opening of the support member is an obtuse angle of 135 degrees or more, and the angle is R.

[0025]

A laser light source, a collimator lens for collimating the laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and the laser light source press-fitted and held at one end, and another In an emission optical device having a substantially cylindrical support member for mounting a lens barrel holding the collimator lens at an end thereof, at least one through hole is provided on a side surface of the support member, and a laser light source is press-fitted. Burrs generated in the above are sucked from the hole.

A flat step is provided in the middle of at least one of the holes, and the tip of the pipe for sending clean air is brought into contact with the step.

A plurality of the holes are provided radially in the radial direction of the support member, burr is sucked from some holes, and outside air is taken in from the other holes.

At least one of the holes serves as a mounting reference hole for the emission optical device, and is fitted with a pin provided in the optical box when the emission optical device is attached to the optical box.

An emission having a laser light source, a collimator lens for collimating the laser light emitted from the laser light source, a lens barrel holding the collimator lens, and a substantially cylindrical support member for press-fitting and holding the laser. In the optical device, a groove is provided in a part of the inner wall of the support member, and the groove forms a cutout portion on the laser light source press-fitting side end surface of the support member to communicate the inside and the outside of the support member even after the laser light source is press-fitted. It is designed to act as a passage for air when sucking burrs.

[0030]

【Example】

(First embodiment) FIG. 1 (a), FIG. 1 (b), FIG. 1 (c)
The first embodiment of the present invention is shown in FIG.

FIG. 1 showing a schematic configuration of this laser emitting apparatus.
In (a), 1 is a semiconductor laser which is a laser light source, 2 is
Is a collimator lens, and 3 is a lens barrel that supports the collimator lens 2. Reference numeral 4 is a holder that is a support member that supports the lens barrel 3 and the semiconductor laser. An electric circuit board 5 drives the semiconductor laser 1. The lens barrel 3 is adjusted in the XYZ directions for optical axis adjustment and focus adjustment, and is fixed to the holder 4.

The emission optical device which has been assembled is fixed to the optical box 7 with screws 8. From the optical box 7, the pins 7a,
7b is projected and the holder 4 is positioned.

The semiconductor laser 1 is press-fitted and fixed in the holder 4. After the semiconductor laser 1 is press-fitted, a burr 4b is generated on the holder 4. A method of removing this burr is shown in FIGS.
An explanation will be given using (c). The holder 4 is, for example, ABS, P
It is made of resin material such as C or PPS or glass fiber added to these materials.
Is very brittle and easy to peel off. Burr 4b generated here
When it is attempted to remove by removing from the laser emission port of the holder 4 by using the aspirator 9, the cylindrical portion 4c is sealed, so that air cannot flow and suction is difficult. Therefore, as shown in FIG. 1C, if a hole 4a is provided so as to penetrate the holder side surface substantially perpendicularly to the laser optical axis, a flow F of air is generated and the burr 4b is sucked.

When carrying out this work, it is desirable to carry out the work in a dust-controlled place such as a clean room so that dust and the like will not newly enter through the holes 4a. Also, if the direction of the hole 4a is downward, dust hardly enters. Further, when dust is disliked, the hole 4a may be closed with a sealing material 6 so that dust does not enter after removing the burr 4b.

By this method, even when the resin holder is used, it is possible to prevent the burr generated at the time of press-fitting from having an adverse optical effect.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In a schematic configuration diagram of a laser emission device that is this emission optical device, a hole 4a is arranged near a side surface of a cap 1a of a semiconductor laser.

In this case, more F is generated in the vicinity of the burr 4b in the air flow, and the burr 4b is easily removed.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the schematic configuration diagram of the laser emitting device as the emitting optical device, the hole 4a is a stepped hole.
Reference numeral 11 is a pipe for sending clean air through a filter. The tip of the tube 11 is abutted against the step D of the hole 4a to prevent outside air from entering.

In this case, large facilities such as a clean room are not required.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the schematic configuration diagram of the laser emitting device that is the emitting optical device, the holes 4 a are radially arranged in the radial direction of the holder 4.

In this case, the efficiency of removing burrs is improved and the working time can be shortened.

Since there are a plurality of holes 4a, it is possible to suck from some of the holes and take in outside air from the other holes, so that the burr can be removed even after the collimator lens portion is three-dimensionally bonded.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the schematic configuration diagram of the laser emission device that is the emission optical device, the hole 4a is closed by a label R. A bar code is printed on this label R of the present embodiment, and it is used for management during manufacturing.

In this case, the cost increase due to the blockage of 4a can be minimized.

(Sixth Embodiment) FIG. 6 shows a sixth embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the schematic configuration diagram of the laser emission device as the emission optical device, a hole 4a serving as a mounting reference hole is provided with a pin 7 when the completed emission optical device is attached to the optical box 7.
The injection optical device is positioned by fitting with a.

In this case, since the hole 4a is closed when it is assembled to the optical box 7, the hole 4a can be closed without increasing the cost. Further, since the mounting reference holes can be arranged so as to intersect perpendicularly to the optical axis of the semiconductor laser 1, it is possible to reduce the mechanical tolerance and improve the assembling accuracy of the emission optical device.

(Seventh Embodiment) FIG. 7 shows a seventh embodiment of the present invention.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In a schematic configuration diagram of a laser emission device as this emission optical device, a groove 4d is provided in a part of an inner wall of a cylindrical portion 4c into which the semiconductor laser 1 is press-fitted.
Is a cutout 4 on the end face 4f of the laser light source press-fitting side of the support member.
Even when the semiconductor laser 1 is press-fitted by forming e, the inside and outside of the support member are communicated with each other. When the semiconductor laser 1 is press-fitted, the burr 4b is not generated in the groove 4d, so that the burr generation area is reduced. Further, when the burr is sucked by the suction device 9, a flow of air is generated through the groove 4d, so that suction is possible. If the groove 4d is provided on the upper side with respect to the attachment, even if the burr 4b remains, there is no risk of dropping and blocking the optical path.

(Eighth Embodiment) FIG. 8 shows an eighth embodiment of the present invention.

The same members as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted. In a schematic configuration diagram of a laser emission device that is this emission optical device, a cutout portion 4e, a groove 4d, and a cylindrical portion 4c are shown.
The angle L of the intersection of the openings is formed as an obtuse angle of 135 degrees or more. Furthermore, the corners are R.

In Example 7, the corner portion L was brittle and the burr 4b was easily generated. In this case, however, since the corner portion L also has no brittle portion, the occurrence of the burr 4b can be further suppressed.

[0057]

The present invention has the above-mentioned description and operation, and includes a laser light source, a collimator lens that collimates the laser light emitted from the laser light source, and a lens barrel that holds the collimator lens. An injection optical device having a substantially cylindrical support member on one end of which the laser light source is press-fitted and held and on the other end of which a lens barrel holding the collimator lens is mounted, the tubular portion of the support member By providing at least one through hole on the side surface, it is possible to prevent the burr generated when the laser light source is press-fitted from having an adverse optical effect.

By providing the support member inner wall side opening of at least one of the holes at a position facing the side surface of the laser cap press-fitted into the support member,
A large amount of air flow is generated near the burr, and the burr removability can be improved.

By providing a flat step in the middle of at least one of the holes, the tip of the pipe for sending clean air through the filter can be abutted against the step of the hole, and the clean room It is possible to remove burrs without requiring large equipment such as.

By providing a plurality of holes radially in the radial direction of the support member, the efficiency of burr removal can be improved and the working time can be shortened. Further, since there are a plurality of holes, it is possible to perform deburring work even after suctioning from some of the holes, taking in outside air from the other holes, and three-dimensionally bonding the lens barrel holding the collimator lens.

By closing the hole with a label, the cost for closing can be reduced.

By using the label as a label used for manufacturing control, cost increase due to blockage can be minimized.

Since at least one of the holes is a mounting reference hole for the emission optical device, the hole can be closed without increasing the cost. Further, by disposing the mounting reference holes so as to intersect perpendicularly with the optical axis of the laser, the mechanical tolerance is reduced and the assembling accuracy of the emission optical device is improved.

It has a laser light source, a collimator lens for collimating the laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and a substantially cylindrical support member for press-fitting and holding the laser light source. In the emission optical device, a groove is provided in a part of the inner wall of the support member, and the groove forms a cutout portion on the laser light source press-fitting side end surface of the support member to define the inside and the outside of the support member even after the laser light source is press-fitted. By making them communicate with each other, it is possible to reduce the burr generation area and to generate an air flow when sucking the burr.

The angle at the intersection of the notch and the opening of the support member is an obtuse angle of 135 degrees or more, and the corner is R, so that the brittle portion of the corner is eliminated and the occurrence of burrs is reduced. Can be suppressed.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an emission optical device showing a first embodiment of the present invention.

FIG. 2 is a side sectional view of an essential part showing an emission optical device showing a second embodiment of the present invention.

FIG. 3 is a side sectional view of an essential part showing an emission optical device showing a third embodiment of the present invention.

FIG. 4 is a side sectional view of an essential part showing an emission optical device showing a fourth embodiment of the present invention.

FIG. 5 is a side sectional view of an essential part showing an emission optical device showing a fifth embodiment of the present invention.

FIG. 6 is a side sectional view of a main part showing an emission optical device according to a sixth embodiment of the present invention.

FIG. 7 (a) is a diagram showing a laser light source press-fitting side end face of a supporting member according to a seventh embodiment of the present invention. Figure 7
FIG. 9B is a side sectional view of an essential part showing the emission optical device showing the seventh embodiment of the present invention.

FIG. 8A is a diagram showing a laser light source press-fitting side end face of a supporting member according to an eighth embodiment of the present invention. FIG.
FIG. 9B is a side sectional view of an essential part showing the emission optical device showing the eighth embodiment of the present invention.

FIG. 9 is a diagram showing a conventional example.

FIG. 10 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 semiconductor laser (laser light source) 2 collimator lens 3 electric circuit board 4 holder (supporting member) 4a hole 5 lens barrel 4d groove 4e cutout 4f laser light source press-fitting side end face of the supporting member

Claims (9)

[Claims] 1. A laser light source, a collimator lens for collimating laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and the press-fitted holding of the laser light source at one end, In an emission optical device having a substantially cylindrical support member on which a lens barrel holding the collimator lens is attached at the other end, at least one through hole is provided on a side surface of the support member. Ejection optical device. 2. The support member inner wall side opening of at least one of the holes is provided at a position facing a side surface of the cap of the laser light source press-fitted into the support member. Item 1. The ejection optical device according to Item 1. 3. The emission optical device according to claim 1, wherein a flat step is provided in the middle of at least one of the holes. 4. The emission optical device according to claim 1, wherein a plurality of the holes are radially provided in a radial direction of the support member. 5. The emission optical device according to claim 1, wherein the hole is covered with a label. 6. The emission optical device according to claim 5, wherein the label is a label used for manufacturing control. 7. The emission optical device according to claim 1, wherein at least one of the holes is a mounting reference hole of the emission optical device. 8. A laser light source, a collimator lens for collimating laser light emitted from the laser light source, a lens barrel for holding the collimator lens, and a substantially tubular support member for press-fitting and holding the laser. In the emission optical device having
A groove is provided in a part of the inner wall of the supporting member, and the groove forms a cutout portion on the laser light source press-fitting side end surface of the supporting member so that the inside and the outside of the support member communicate with each other even after the laser light source is press-fitted. An ejection optical device characterized in that 9. The emission optical device according to claim 8, wherein an angle of a portion where the cutout portion and the opening of the support member intersect each other is an obtuse angle of 135 degrees or more, and the corner portion is R.