JPH0659205A - Deflection scanning device - Google Patents

Abstract

PURPOSE:To realize a deflection scanning device for which a scan start signal detection system can readily be incorporated. CONSTITUTION:A part L3 of a laser beam L2 deflection-scanning by a rotary polygon mirror 2 is reflected by a detection mirror 4 as a scan start signal and introduced to an optical fiber detector 5. The optical fiber detector 5 is held to one end of a long-length supporting body 5a, and the other end of the supporting body 5a is attached pivotally just under a reflection point in the detection mirror 4. Instead of adjusting an attaching angle in the detection mirror 4, by moving pivotally the supporting body 5a, the optical fiber detector 5 is rotated around the reflection point in the detection mirror 4, and the supporting body 5a is fixed to a casing 6 at a position where a reflected beam L4 is received by the optical fiber detector 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection scanning device used in laser printers, laser facsimiles and the like.

[0002]

2. Description of the Related Art FIG. 14 shows an example of a deflection scanning device used in a laser printer, a laser facsimile, or the like.

The laser beam L ₀ emitted from the semiconductor laser unit 101 is deflected and scanned by a rotary polygon mirror 102 having a reflecting surface composed of a plurality of mirror surfaces 102a to 102f, and an imaging lens system composed of a plurality of lenses 103a and 103b. An image is formed on the photosensitive body of the photosensitive drum D ₀ via 103,
An electrostatic latent image is formed on the photoconductor by main scanning by rotation of the rotary polygon mirror 102 and sub-scanning by the photosensitive drum D ₀ . A part L _p of the laser beam L ₀ deflected and scanned by the rotary polygon mirror 102 is used as a scanning start signal by the detection mirror 10.
It is reflected by 4, is received by the optical fiber detector 105 formed of an optical fiber tube, and is converted into an electrical trigger signal by a connector (not shown). The semiconductor laser unit 101 receives the trigger signal and starts writing modulation for forming an image. The optical fiber detector 105 measures the light receiving end of the optical fiber tube along the optical path of the laser light L _p from the reflecting surface of the rotary polygon mirror 102, and the distance measured on the surface of the photosensitive drum D ₀ is the laser light L.
It is arranged at the same position as the distance measured from the reflecting surface of the rotary polygon mirror 102 along the optical path of ₀ . The semiconductor laser unit 101, the rotary polygon mirror 102, the imaging lens system 103, the scanning start signal detection system including the detection mirror 104 and the optical fiber detector 105, etc. are housed in the housing 106, and the opening of the housing 106 is It is closed by a lid (not shown).

The detection mirror 10 is shown in FIGS.
4 and the mirror holder 104a for supporting the same are shown in an enlarged manner. The mirror holder 104a is made of sheet metal L as shown in plan views and elevation views in FIGS. 12 (a) and 12 (b), respectively. A main body 111 having a shape
Reference numeral 1 is composed of a rising portion 111a and a base portion 111b, and the detection mirror 104 is adhered or fixed to the surface of the rising portion 111a by a pressing spring or the like. The mirror holder 104a to which the detection mirror 104 is attached is fixed to a base 112 by a fixing screw 113, and the base 112 is fixed to a casing 106 (shown in FIG. 14) of the deflection scanning device by a screw (not shown). As shown in the disassembled state in FIG. 12C, the base portion 111b of the main body 111 has a hole 115 into which the tubular pin 114 integrally provided on the base 112 is loosely fitted.
And an arc-shaped elongated hole 116 into which the fixing screw 113 is loosely fitted, and the tubular pin 114 is fitted in the central hole 118 of the cam 117. The cam 117 is a rising portion 111a of the main body 111.
Has a cam surface 117a that is pressed against the back surface of the.

In assembling the detection mirror 104, first, the cam 117 is rotated to pivot the rising portion 111a of the main body 111 with respect to the base portion 111b in the direction indicated by arrow B in FIG. Rising portion 1 of main body 111
The angle formed by 11a and the base portion 111b (hereinafter referred to as "orientation angle").
Say. ) Correct α. The tilt angle α is determined by attaching the detection mirror 104 to the rising portion 111a of the main body 111, and the weight of the detection mirror 104 causes the main body 111 made of sheet metal to be detected.
Since a distortion occurs in the mirror holder, such a correction is required after the detection mirror 104 is attached to each mirror holder 104a. After fixing the cam 117 to the tubular pin 114 by tightening the screw 119 in the screw hole of the tubular pin 114,
While irradiating the detection mirror 104 with the laser beam L _p , the main body 1
11 is rotated around the tubular pin 114 as indicated by an arrow C, and the fixing screw 113 is mounted on the base 1 at the rotation position when the optical fiber detector 105 receives the reflected light of the laser light L _p.
Tighten the 12 screw holes 112a. The opening at the light receiving end of the optical fiber of the optical fiber detector has an extremely small area, and as shown in FIG. 13, the angle formed by the laser beam L _p and the reflecting surface of the detector mirror 104 (hereinafter referred to as “mounting angle”). When β changes by, for example, θ, the detection mirror 104
Since the optical path of the reflected light is shifted by 2θ with respect to the original optical path, extremely high accuracy is required for adjusting the attachment angle β. For this purpose, the detection mirror 104 and the mirror holder 10
Parts such as the main body 111, the cam 117, and the base 112 of 4a require high dimensional accuracy, and therefore the manufacturing cost of these parts is high.

[0006]

However, according to the above-mentioned prior art, as described above, the assembly of the scanning start signal detection system is extremely complicated, and in addition, a mirror holder, which has a complicated structure and is expensive, must be used. This is one of the causes of an increase in the manufacturing cost of the deflection scanning device.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and it is necessary to use an expensive mirror holder which has a simple structure for assembling a scanning start signal detection system and has a complicated structure. It is an object of the present invention to provide a deflection scanning device which does not have a deflection scanner.

[0008]

In order to achieve the above object, the apparatus of the present invention comprises a rotary polygonal mirror having a plurality of mirror surfaces, and detection for reflecting a part of laser light deflected and scanned by the rotary polygonal mirror. A mirror; a scanning start signal detector for receiving the reflected light of the detection mirror; and a guide means for guiding the scanning start signal detector along a predetermined rotation path around the reflection point of the detection mirror. It is characterized by

A rotary polygon mirror having a plurality of mirror surfaces,
A deflection scanning device comprising a detection mirror that reflects a part of laser light deflected and scanned by the rotary polygon mirror, and a scanning start signal detector that receives the reflected light of the detection mirror, wherein the detection mirror is the deflection device. It may be held in a part of the housing of the scanning device, and a part of the housing may be pivotally movable by a notch provided in the housing.

A rotary polygon mirror having a plurality of mirror surfaces,
A deflection scanning device comprising a detection mirror that reflects a part of the laser beam deflected and scanned by the rotating polygon mirror, and a scanning start signal detector that receives the reflected light of the detection mirror, wherein a part of the detection mirror is It may be pivotally locked within a predetermined range in a locking groove or a locking hole provided in the housing of the deflection scanning device.

A rotary polygon mirror having a plurality of mirror surfaces,
A deflection scanning device comprising a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygon mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror, wherein the detection mirror is a synthetic resin. It has an L-shaped body composed of a rising portion integrally formed of a material and a base portion supporting the rising portion, the rising portion having a reflecting surface formed by vapor deposition of a reflecting film, and the base portion having the deflection. It may be pivotally attached to the housing of the scanning device.

Further, a rotary polygonal mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of the laser beam deflected and scanned by the rotary polygonal mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror are provided. In the deflection scanning device, the detection mirror has a flat plate-shaped main body made of a transparent material and a reflection surface formed by vapor deposition of a reflection film on the main body, and the main body supports the reflection mirror. The base is provided with a recess into which a support pin or a support frame integrally provided is fitted, and the support pin or the support frame is adhered to the recess by an ultraviolet curing adhesive applied to the recess. Good.

[0013]

In assembling the scanning start signal detector, the scanning start signal detector may be moved along a predetermined rotation path so that the scanning start signal detector receives the reflected light of the detection mirror. it can.

If the detection mirror is held by a part of the housing and the part of the housing is pivotable, a part of the housing can be pivoted when the detection mirror is assembled. The held detection mirror can be adjusted to the angle at which the reflected light is received by the scanning start signal detector.

If a part of the detection mirror is pivotally locked in a locking groove or a locking hole provided in the housing within a predetermined range, the detection mirror is pivoted within that range. Thus, it is possible to adjust the angle at which the light reflected by the detection mirror is received by the scanning start signal detector.

Further, the detection mirror has an L-shaped main body composed of a rising portion integrally made of a synthetic resin material and a base portion supporting the rising portion, and the rising portion is a reflecting surface formed by vapor deposition of a reflecting film. If the base is pivoted to the housing, it is easy to reduce the weight of the detection mirror,
And the adjustment of the mounting angle is also easy.

A rotary polygon mirror having a plurality of mirror surfaces,
A deflection scanning device comprising a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygon mirror and a scanning start signal detector for receiving the reflected light of the detection mirror, wherein the detection mirror is transparent. A plate-shaped main body made of a material, and a support pin or a support frame integrally provided on a base for supporting the main body having a reflection surface formed by vapor deposition of a reflection film on the main body. The detection mirror is provided with a recess to be fitted, and if it is adhered to the support pin or the support frame by an ultraviolet curing adhesive applied to the recess, the detection mirror can be used without using an adhesive containing a vaporized component. Can be fixed to the base.

[0018]

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

FIG. 1 shows a first embodiment, (a) is a schematic plan view thereof, and (b) is an enlarged partial perspective view showing only a scanning start signal detecting system in an enlarged manner. The deflection scanning device E ₁ includes a semiconductor laser unit 1 for generating a laser beam L ₁ and a rotary polygon mirror 2 having a plurality of mirror surfaces 2a to 2f.
A semiconductor laser unit having an imaging lens system 3 including a spherical lens 3a and a toric lens 3b, and a scanning start signal detection system S _{1 including} a detection mirror 4 and an optical fiber detector 5 which is a scanning start signal detector. The laser beam L ₁ generated from the laser beam _No.
Is scanned in the direction of arrow A ₂ by the rotary polygon mirror 2 that rotates in the direction deflection, rotary drum D ₁ through the imaging lens system 43
Image on the photoreceptor of the main scanning by the rotation of the rotary polygon mirror 2,
And an electrostatic latent image is formed on the photoconductor by sub-scanning by rotation of the rotary drum D ₁ . The semiconductor laser unit 1, the rotary polygon mirror 2, the imaging lens system 3, the detection mirror 4 and the optical fiber detector 5 are housed in a housing 6, and the opening of the housing 6 is closed by a lid (not shown).

The scanning start signal detection system S ₁ comprises a rotary polygon mirror 2
A part L ₃ of the laser beam L ₂ deflected and scanned by is reflected by a detection mirror as a scanning start signal, the reflected light is received by the optical fiber detector 5, and introduced into a connector (not shown), where an electrical trigger is made. Convert to signal.
The semiconductor laser unit 1 receives this trigger signal and starts writing modulation for forming an image. The detection mirror 4 of the scanning start signal detection system S ₁ is bonded to the surface of a flat plate-shaped mirror holder 41 having a pair of legs 41a and 41b fixed to the housing 6 of the deflection scanning device E ₁ . Also,
The optical fiber detector 5 is a long support 5 which is a guiding means.
It is supported by a support member 5b integrally provided at one end of a, and the other end of the support 5a has an axis extending through the reflection point of the detection mirror 4 and parallel to the rotation axis of the rotary polygon mirror 2 as a central axis. It is pivotally attached to the housing 6 by a pivot pin 5c.

The scanning start signal detection system S ₁ is assembled by supporting the support 5 while reflecting the laser light L ₃ by the detection mirror 4.
The optical fiber detector 5 finds a rotational position where the optical fiber detector 5 receives the reflected light L ₄ of the detection mirror 4 by rotating a around the pivot pin 5c, and the support 5a is fixed to the housing 6 there. In order to fix the support 5a, it is desirable to bond a part of it to the housing 6. According to this embodiment, instead of adjusting the mounting angle of the detection mirror 4, the support 5a is rotated to adjust the mounting position of the optical fiber detector 5, so that the mounting angle of the detection mirror 4 can be adjusted. Not only is the permissible value of error doubled as compared with the case of adjustment, but the amount of displacement of the optical fiber detector 5 supported by the free end of the support 5a is small even if the rotation angle of the support 5a is minute. Is large, it is extremely easy for the optical fiber detector 5 to find the rotation position where the reflected light L ₄ of the detection mirror ₄ is received. Further, the support 5a
Since the distance between the optical fiber detector 5 and the reflecting surface of the detection mirror 4 does not change even when is rotated, the focal position of the reflected light L ₄ incident on the optical fiber detector 5 does not shift.

FIG. 2 illustrates a modified example of the present embodiment. In this modified example, instead of using the support 5a, the housing 6 is rotated through a reflection point of the detection mirror 4 at a predetermined position. By providing an arc-shaped guide groove 16a whose center axis is an axis extending in parallel with the rotation axis of the polygon mirror 2, and by sliding the leg portions 15a and 15b of the optical fiber detector 15 along the guide groove 16a, The position where the optical fiber detector 15 receives the reflected light L ₄ is found. It should be noted that instead of the guide groove, a cylindrical guide surface may be provided at a predetermined position of the housing.

FIG. 3 shows a second embodiment, (a) is a schematic plan view thereof, and (b) is a partial perspective view showing a mounting portion of a detection mirror. As in the first embodiment, the deflection scanning device E ₂ includes a semiconductor laser unit 21, a rotary polygonal mirror 22 having a plurality of mirror surfaces, an imaging lens system 23 including a spherical lens 23a and a toric lens 23b, and a detection mirror 24. And a scan start signal detection system S _{2 including} an optical fiber detector 25 which is a scan start signal detector, and these are housed in a housing 26, and the opening of the housing 26 is closed by a lid (not shown).

The detection mirror 24 is adhered to a mirror holder 24a which is a part of the housing 26. The connecting portion between the housing 26 and the mirror holder 24a is a notch 26 having a V-shaped cross section.
It is locally thin due to a, and the mirror holder 2
A hinge is formed that elastically and rotatably connects the housing 4a to the housing 26. The scan start signal detection system S ₂ is assembled by causing the detection mirror 24 to reflect a laser beam (not shown) that is a scan start signal, and pivoting the mirror holder 24 a with respect to the housing 26 to reflect the reflected light. The pivotal position received by the fiber detector 25 is found, where the edge 24b of the mirror holder 24a is glued to the housing 26.

In this embodiment, the mirror holder is a part of the housing, and the mounting angle of the detection mirror is adjusted by pivoting the mirror holder around the hinge formed on the housing. It is easy to adjust and the number of manufacturing parts can be greatly reduced. Instead of adhering the detection mirror to the mirror holder, the detection mirror can be integrally embedded in the mirror holder when the housing is molded.
It is also possible to form a mirror holder that is integral with the detection mirror by vapor-depositing a metal reflection film on a predetermined portion of the mirror holder when molding the housing.

FIG. 4 shows a third embodiment, (a) is a schematic plan view thereof, and (b) is an enlarged partial sectional view showing a mounting portion of a detection mirror in an enlarged manner. The deflection scanning device E ₃ is
Similar to the first embodiment, the semiconductor laser unit 31, the rotary polygon mirror 32 having a plurality of mirror surfaces, the imaging lens system 33 including the spherical lens 33a and the toric lens 33b.
And a scanning start signal detection system S _{3 including} a detection mirror 34 and an optical fiber detector 35 which is a scanning start signal detector. These are housed in a housing 36, and an opening of the housing 36 has a lid (not shown). Is blocked by.

One end 34a which is a part of the detection mirror 34
Is locked in a locking groove 36b of a locking member 36a provided integrally with the housing 36, and the other end is engaged in a recess 36c provided in the housing 36. The width W _{1 of the} locking groove 36b is about 10% of the thickness of the detection mirror 34, and the detection mirror 34 is pivotable within a range permitted by the width W ₁ and the width W ₂ of the recess 36c. The width W _{2 of the} recess 36c is determined by the detection mirror 3
About twice the thickness of 4 is desirable.

To assemble the detection mirror 34, both ends thereof are inserted into the engaging groove 36b and the recess 36c, respectively.
While the laser beam (not shown) which is a scanning start signal is reflected by the detection mirror 34, the detection mirror 34 is locked by the locking groove 3
6b and the reflected light is moved around the optical fiber detector 3
The spacer 3 in which the pivot position received by 5 is found, and the adhesive is applied between the detection mirror 34 and the housing 36 there
7 is inserted and adhered to the detection mirror 34 and the housing 36. The spacer 37 itself may be made of an adhesive.

In this embodiment, the detection mirror is locked in the locking groove provided in the housing, and the detection mirror is fixed only by inserting an irregular spacer between the housing and the detection mirror. Therefore, the mounting angle of the detection mirror can be easily adjusted, and a component with high dimensional accuracy for fixing the detection mirror is not required.

FIG. 5 shows a modification of this embodiment.
(A) is a partial schematic plan view showing only the mounting portion of the detection mirror, and (b) is an enlarged partial perspective view showing this in an enlarged manner. The housing 46 of the present modification example has a square notch 46 that is a pair of locking holes instead of the locking member 36a and the recess 36c.
L-shaped rising locking pieces 44a and 44b, which are a part of the detection mirror integrally provided at one end of the detection mirror 44, are locked to both of them. As a result, the detection mirror 44 is pivotally locked to the housing 46 by a predetermined angle. The mounting of the detection mirror 44 is performed by adjusting the mounting angle of the detection mirror 44 in the same manner as described above, and then inserting a spacer 44c coated with an adhesive between the housing 46 and the detection mirror 44. 44 and the housing 46.

FIG. 6 shows a fourth embodiment. The deflection scanning device E ₄ has a semiconductor laser unit 51, a spherical lens 53a and a toric lens 53 as in the first embodiment.
b has an imaging lens system 53 composed of b, and a scanning start signal detection system S ₄ composed of a detection mirror 54 and an optical fiber detector 55 which is a scanning start signal detector, and these are housed in a housing 56. The opening of the body 56 is closed by a lid (not shown). The detection mirror 54 has a main body 57 made of synthetic resin composed of a rising portion 57a and a base 57b.
Reference numeral b is a trapezoidal plate-like body whose width is gradually reduced as the distance from the rising portion 57a increases.

As shown in FIG. 7, the rising portion 57a of the main body 57 of the detection mirror 54 has a reflecting surface 58 formed by vapor deposition of a highly reflective metal film. Further, the base 57b of the main body 57 is integrally provided with a pin 57c projecting to the opposite side to the rising portion 57a, and the pin 57c is fixed to the housing 56 and is pivotally fitted in a hole 60a of the base 60. Is inserted. The base 57b further has an arcuate elongated hole 60b, and the elongated hole 60b loosely fits a fixing screw 61 for fixing the main body 57 to the base 60. Detection mirror 5 of this embodiment
Reference numeral 4 denotes a reflecting surface 5 formed by directly vapor-depositing a highly reflective metal film on a synthetic resin main body 57 integrally formed.
It is extremely lightweight because it has No. 8 and does not require adjustment of the tilt angle as in the case where a separately manufactured detection mirror is attached to the L-shaped mirror holder. To attach the detection mirror 54, the pin 57c is inserted into the hole 60a of the base 60, and the laser beam L ₅ which is a scanning start signal is transmitted to the reflection surface 58.
While irradiating the laser beam, the detection mirror 54 is rotated around the central axis of the pin 57c to find a rotation position where the reflected light of the laser light L ₅ is received by the optical fiber detector 55, and then, in the long hole 60b. The detection mirror 54 is fixed to the base 60 by tightening the loosely fitting fixing screw 61.

FIG. 8 shows a modified example of this embodiment. The detection mirror 64 of this modified example has a main body 67 composed of a rising portion 67a and a base portion 67b, and the main body 67 is made of a transparent synthetic resin material. Shaped and raised part 67
a is a reflective surface 68 formed by vapor deposition of a highly reflective metal film
Have. Further, a pin 67c projecting to the side opposite to the rising portion 67a is integrally provided on the base portion 67b of the main body 67, and the pin 67c is pivotally fitted into a hole 70a formed in the base 70. Further, the base 70 has a recess 70b on the contact surface with the base 67b of the main body 67, and the recess 70b is filled with an ultraviolet curing adhesive 71. In order to fix the detection mirror 64 to the base 70, ultraviolet rays generated from the ultraviolet ray irradiator 72 are applied to the transparent base 67b of the main body 67 to cure the adhesive 71 filled in the recess 70b of the base 70. Let In this modification, since it is not necessary to provide an arc-shaped long groove in the main body, it is easier to make the main body of the detection mirror, and the rotation angle around the pin is limited when the detection mirror is assembled. In addition, the mounting work is easier and the mounting error does not occur as compared with the case where the fixing screw is tightened.

FIG. 9 illustrates a vapor deposition apparatus for vapor depositing a highly reflective metal film on the rising portion of the main body of the detection mirror shown in FIGS. 7 and 8, and FIG. 9 (a) is shown with the top plate removed. A schematic plan view, (b) is a schematic sectional view. Vapor deposition device V
₀ is a rotary table V _{1 on the} upper surface of which is mounted a plurality of detection mirror main bodies 571 to 583 similar to the detection mirror main body 57 or 67 shown in FIG. 7 or 8, and is rotated in a predetermined direction. Pins 571c to 583c of the main bodies 571 to 583 of the respective detection mirrors, which have a motor shaft V ₂ to be driven.
Is inserted into a hole provided in the rotary table V ₁ . The main bodies 571 to 583 of the detection mirror are formed by the respective rising portions 5
Mutually adjacent to form a single tubular surface T ₁ in 71a~583a outer peripheral edge of the rotary table V _1, the base portion 571a
˜583a are mounted so as to be positioned inside the cylindrical surface in the radial direction. Turntable V ₁ on top of the cylindrical surface T ₁
After covering with the same top plate V ₃ as above, if necessary, top plate V _3
A detection mirror body similar to the detection mirror bodies 571 to 583 is mounted on 3 and a cylindrical surface T ₂ formed by this
Cover with the top plate V ₄ . While rotating the rotary table V ₁ , metal vapor is generated from the vapor deposition nozzle V ₅ toward the cylindrical surfaces T ₁ and T ₂ .

[0035] Detection mirror of FIGS. 7 and 8, because the base of the body is a trapezoidal plate-like member gradually decreases as the distance from the rising part, the rotation number of these tables V ₁
And can be radially mounted on the top plate V ₃ . The vapor deposition apparatus described above can greatly reduce the time required for the vapor deposition process for each detection mirror without requiring any masking means other than the top plate.

FIG. 10 is an exploded perspective view showing only the detection mirror of the fifth embodiment, that is, the detection mirror 84 of the present embodiment.
Has a plate-shaped main body 87 made of a transparent material, the main body 87 has a reflecting surface 88 formed by vapor deposition of a highly reflective metal film on one surface, and has concave portions on both side edges. Long grooves 87a, 87b are provided. The base 89 that supports the main body 87 includes a pair of support pins 89 that are erected at one end thereof.
The support pins 89a and 89b are slidable along the long grooves 87a and 87b of the main body 87 of the detection mirror 84, respectively.

The detection mirror 84 is assembled in the following manner. After applying an ultraviolet curable adhesive to each of the long grooves 87a and 87b of the main body 87, a support pin 89 of the base 89 is formed.
a and 89b are respectively slid along the long grooves 87a and 87b of the main body 87, the lower end of the main body 87 is brought into contact with the upper surface of the base 89, and then the long grooves 87a and 87b are irradiated with ultraviolet rays to cause the adhesive agent. Cure. Next, the base 89 is fixed to the housing of the deflection scanning device with a screw (not shown).

Since the detection mirror of this embodiment is formed by depositing a highly reflective metal film on a plate-shaped body made of a transparent material, when the detection mirror is adhered to an L-shaped mirror holder or this is used. It is easier to manufacture than when a highly reflective metal film is vapor-deposited. Further, since the main body is transparent, the main body and the base can be adhered to each other with an ultraviolet curable adhesive. Therefore, unlike the case where the conventional adhesive is used, the reflective surface is not contaminated by the vaporized component of the adhesive.

FIG. 11 shows a modification of this embodiment.
The detection mirror 94 of this modified example has a plate-shaped main body 97 made of a transparent material, and the main body 97 surrounds a reflective surface 98 formed by vapor deposition of a highly reflective metal film and its periphery from three sides. It has a U-shaped notch 97a which is a recess. The base 99 has a U-shaped support frame 9 integrally provided at one end thereof.
9a, the support frame 99a can be fitted in the notch 97a of the main body 97. After the ultraviolet curable adhesive is applied to the notch 97a of the main body 97, the support frame of the base 99 is fitted into the notch 97a, and the adhesive is cured by irradiating ultraviolet rays.

[0040]

Since the present invention is configured as described above, it has the following effects.

A deflection scanning device can be realized in which a scan start signal detection system including a detection mirror and a scan start signal detector is easily assembled, and a complicated structure and an expensive mirror holder are not required.

The invention of claim 1 realizes a deflection scanning device which does not require adjustment of the mounting angle of the detection mirror.

According to a fourth aspect of the present invention, a deflection scanning device capable of adjusting the mounting angle of the detection mirror by simply pivoting a part of the housing is realized.

The invention of claim 8 realizes a deflection scanning device capable of adjusting the mounting angle of a detection mirror only by locking the detection mirror in a casing and pivoting the detection mirror.

According to the tenth aspect of the present invention, a deflection scanning device in which the weight of the detection mirror can be easily reduced and the assembly with respect to the housing is easy is realized.

According to the thirteenth aspect of the present invention, there is realized a deflection scanning device in which there is no risk of contaminating the reflecting surface of the detection mirror by the vaporized component of the adhesive.

As a result, it is possible to realize a deflection scanning device which is easy to assemble and has a low manufacturing cost.

[Brief description of drawings]

1A and 1B show a first embodiment, FIG. 1A is a schematic plan view thereof, and FIG. 1B is an enlarged partial perspective view showing an enlarged scanning start signal detection system.

FIG. 2 is an enlarged partial perspective view illustrating a scanning start signal detection system according to a modified example of the first embodiment.

3A and 3B show a second embodiment, in which FIG. 3A is a schematic plan view thereof, and FIG. 3B is a partial perspective view showing a detection mirror and its mounting portion.

4A and 4B show a third embodiment, FIG. 4A is a schematic plan view of the same, and FIG. 4B is an enlarged partial plan view showing a detection mirror and its mounting portion.

FIG. 5 shows a modified example of the third embodiment, in which (a) is a schematic partial sectional view showing a detection mirror and its mounting portion,
(B) is an enlarged partial perspective view showing an enlarged detection mirror and its mounting portion.

FIG. 6 is a schematic plan view showing a fourth embodiment.

FIG. 7 shows a detection mirror of a fourth embodiment, (a)
Is a sectional view thereof, and (b) is a plan view thereof.

8A and 8B show a modified example of the fourth embodiment, wherein FIG. 8A is a sectional view of a detection mirror and FIG. 8B is a plan view thereof.

9 shows an apparatus for depositing a reflection film on the main body of the detection mirror shown in FIG. 7 or FIG. 8, (a) is a schematic plan view showing the top plate removed, and (b) is a schematic view. FIG.

FIG. 10 is an exploded perspective view showing an exploded view of a detection mirror of a fifth embodiment.

FIG. 11 is an exploded perspective view showing an exploded view of a detection mirror of a modified example of the fifth embodiment.

FIG. 12 illustrates a conventional mirror holder,
(A) is the top view, (b) is an elevation view, (c) is an exploded perspective view which decomposes and shows this.

FIG. 13 is an explanatory diagram showing a conventional method for adjusting the mounting angle of the detection mirror.

FIG. 14 is a schematic plan view illustrating a deflection scanning device.

[Explanation of symbols]

S ₁ , S ₂ , S ₃ , S ₄ Scan start signal detection system 1, 21, 31, 51 Semiconductor laser unit 2, 22, 32, 52 Rotating polygon mirror 3, 23, 33, 53 Imaging lens system 4, 24 , 34, 44, 54, 64, 84, 94 Detection mirror 5, 25, 35, 55 Optical fiber detector 6, 26, 36, 46, 56 Housing 5a Support 5b Support member 5c Pivot pin 15a, 15b Leg Part 16a Guide groove 24a, 41 Mirror holder 26a, 46a, 46b, 97a Notch 37, 44c Spacer 36a Locking member 44a, 44b Locking piece 57, 67, 87, 97 Main body 57a, 67a Standing part 57b, 67b Base part 57c, 67c Pin 58,68,88,98 Reflecting surface 61 Fixing screw 71 Adhesive 87a, 87b Long groove 89,99 Base 89a, 89b Support pin 99 a Support frame

Claims (13)

[Claims] 1. A rotary polygon mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygon mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror. A deflection scanning device comprising guide means for guiding the scanning start signal detector along a predetermined rotation path around the reflection point of the detection mirror. 2. The guide means is an elongated support body which is rotatable around an axis extending in parallel with the rotation axis of the rotary polygon mirror through a reflection point of the detection mirror. The deflection scanning device described. 3. The guide means is a guide groove or a guide surface extending in an arc shape around an axis extending in parallel with the rotation axis of the rotary polygonal mirror through a reflection point of the detection mirror. The deflection scanning device described. 4. A rotary polygon mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygon mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror. In the deflection scanning device, the detection mirror is held by a part of a casing of the deflection scanning device, and a part of the casing is pivotally movable by a notch provided in the casing. And a deflection scanning device. 5. The deflection scanning device according to claim 4, wherein the detection mirror is bonded to a part of the housing. 6. The deflection scanning device according to claim 4, wherein the detection mirror is integrally embedded in a part of the housing. 7. The detection mirror is a reflective film deposited on the surface of a part of the housing, as claimed in claim 4.
The deflection scanning device described. 8. A rotary polygonal mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygonal mirror, and a scanning start signal detector for receiving reflected light of the detection mirror. In the deflection scanning device, a part of the detection mirror is pivotally locked within a predetermined range in a locking groove or a locking hole provided in a housing of the deflection scanning device. Characteristic deflection scanning device. 9. The deflection scanning device according to claim 8, wherein a spacer is inserted between the other part of the detection mirror and the housing, and the spacer is bonded to the detection mirror and the housing. . 10. A rotary polygonal mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of the laser beam deflected and scanned by the rotary polygonal mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror. The deflection scanning device is
The detection mirror has an L-shaped main body including a rising portion integrally formed of a synthetic resin material and a base portion supporting the rising portion, and the rising portion includes a reflecting surface formed by vapor deposition of a reflecting film. The deflection scanning device is characterized in that the base is pivotally attached to a housing of the deflection scanning device. 11. The deflection according to claim 9, wherein the main body of the detection mirror is made of a transparent synthetic resin material, and its base is fixed to the housing by an ultraviolet curing adhesive. Scanning device. 12. The deflection scanning device according to claim 9, wherein the width of the base portion of the main body of the detection mirror is reduced with increasing distance from the rising portion. 13. A rotary polygon mirror having a plurality of mirror surfaces, a detection mirror for reflecting a part of laser light deflected and scanned by the rotary polygon mirror, and a scanning start signal detector for receiving the reflected light of the detection mirror. The deflection scanning device is
The detection mirror has a flat plate-shaped main body made of a transparent material and a reflection surface formed by vapor deposition of a reflection film on the main body, and the main body is integrally provided on a base supporting the main body. And a supporting frame for fitting the supporting pin or the supporting frame, and the supporting pin or the supporting frame is adhered to the supporting pin or the supporting frame by an ultraviolet curing adhesive applied to the concave part. .