JP7110001B2 - Collimator lens, light source device, optical scanning device, and image forming device - Google Patents

Description

The present invention relates to a collimator lens , a light source device , an optical scanning device, and an image forming apparatus used in an optical scanning device that irradiates an image carrier with a light beam corresponding to image information.

Image forming apparatuses such as laser beam printers and digital copiers have a means for modulating a semiconductor laser at high speed in order to form an image by irradiating a photosensitive drum with a laser beam that blinks according to image information. there is

Laser light emitted from a semiconductor laser is diffused light with a certain angle of radiation. provided in the forming apparatus.

In particular, a laser light source device in an optical scanning device in which a semiconductor laser is arranged is provided with a collimator lens for condensing laser light emitted from the semiconductor laser into desired parallel light or convergent light. The collimator lens is most accurately aligned with the semiconductor laser and attached by known means such as adhesive.

2. Description of the Related Art Japanese Patent Laid-Open No. 2002-200003 discloses a conventional light source device that includes a light source using a semiconductor laser and a collimator lens. This is equipped with a cylindrical portion for holding a lens in a holder member that holds a semiconductor laser, and is adjusted while holding the collimator lens with a tool, and an adhesive is filled between the cylindrical portion and the collimator lens. is fixed by

In the configuration described in Patent Document 1, three adhesion portions of the holder member are provided for the collimator lens. When curing the filled ultraviolet curable adhesive, UV rays are irradiated from a position facing each adhesive portion (in a direction parallel to the XY plane) to adhere and fix.

JP 2004-342714 A JP 2004-271906 A

However, due to the recent trends toward miniaturization, colorization, and high-definition images, it has become difficult to maintain enough space to hold the collimator lenses at three locations. Passing area is increased. Therefore, as disclosed in Japanese Unexamined Patent Application Publication No. 2002-200010, there are cases where the holder member and the collimator lens must be adhered to two or less locations.

For example, when the holder member 120 and the collimator lens 101 are bonded at two locations as shown in FIG. placed. If the bonding portions 121 and 122 are arranged in such a manner, the UV light L cannot be directly irradiated from a position facing the bonding portions unlike the configuration in which the bonding portions are provided at three locations as in Patent Document 2. That is, in the configuration shown in FIG. 8, since the bonding portion 122 is located at the position facing the bonding portion 121, the UV light L can be directly irradiated from the position facing the bonding portion 121 (here, the bonding portion 122). Can not.

Therefore, in the configuration shown in FIG. 8, the UV light L is made obliquely incident on each bonding portion on the XY plane. In this case, since the UV light L is obliquely incident, the UV light L is refracted by the outer peripheral surface 111 of the cylindrical collimator lens 101 and cannot reach the adhesive portion 121 (122) sufficiently.

This results in an insufficient amount of UV light reaching the bond and increases the time required to fully cure the adhesive.

There is also a method of increasing the intensity of the UV light to shorten the time required for the assembly process, but the collimator lens is thermally deformed by the heat of the UV light irradiation, and the position and shape of the collimator lens change before and after adjustment. There is a risk that the optical characteristics will change due to

Furthermore, uneven illuminance may cause uncured portions of the adhesive to remain, and the collimator lens whose position has been adjusted using a tool may move due to environmental changes or changes over time, degrading assembly accuracy.

In particular, since a plurality of scanning lines are superimposed in a color image forming apparatus, when a plurality of pairs of semiconductor lasers and collimator lenses are used, the variation direction and amount of variation in the irradiation position may change as the relative color shift of each scanning line. Because it appears, there is a risk that the image will be affected.

In order to solve the above problems, a representative configuration of the present invention is a collimator lens held by a holder member, which includes a cylindrical lens portion having a region through which light passes, and an optical axis of the collimator lens. and a projecting portion projecting from the lens portion in the radial direction of the cylinder when viewed in the direction of the optical axis, the lens portion projecting from the outer peripheral surface of the lens portion when the collimator lens is viewed in the optical axis direction. and a part to be adhered that is adhered and fixed via an adhesive to an adhesion part provided on the holder member, and the protrusion is arranged so that when the collimator lens is viewed in the optical axis direction, the protrusion is and the flat surface is provided at a position where a normal line of the flat surface intersects the adherend portion when the collimator lens is viewed in the optical axis direction. and

According to the present invention, the collimator lens can be efficiently adhesively fixed to the holder member.

FIG. 4 is a diagram showing the shape of a collimator lens according to an example; FIG. 1 shows a configuration of a laser light source device according to an embodiment; FIG. 5 is a diagram showing the positional relationship between the collimator lens and the adhesive portion according to the embodiment; 1 is a diagram showing the configuration of an optical scanning device according to an embodiment; FIG. Diagram showing how adhesive is applied to the collimator lens A diagram showing how UV rays are applied to the adhesive part. Detailed view showing the positional relationship between the collimator lens and the adhesive part A diagram showing how a conventional light source device irradiates UV rays Cross-sectional schematic diagram of an image forming apparatus Detailed view showing the positional relationship between the collimator lens and the adhesive part

Preferred embodiments of the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of components described in the following embodiments should be appropriately changed according to the configuration of the device to which the present invention is applied and various conditions. Therefore, it is not intended to limit the scope of the present invention only to them unless specifically stated otherwise.

An optical scanning device having a light source device according to this embodiment will be described with reference to FIGS. 1 to 7. FIG. First, the optical scanning device will be described, then the light source device will be described, and then the process of bonding and fixing the collimator lens to the holder member in the light source device will be described.

<Optical scanning device>
First, with reference to FIG. 1, the overall configuration of the optical scanning device S on which the present laser light source device R is mounted will be described. FIG. 1 is a perspective view showing the overall configuration of an optical scanning device S according to this embodiment.

In FIG. 1, a laser beam (light beam) emitted from a laser light source device R that emits a blinking laser beam according to image information is linearly condensed on the reflecting surface of a rotating polygon mirror 5 by a cylindrical lens 4. . The laser beam linearly focused on the reflecting surface by the cylindrical lens 4 is linearly focused on the reflecting surface of the rotating polygon mirror 5, and is deflected by a deflector having the rotating polygon mirror 5 rotated at high speed. be deflected. The laser beam deflected by the deflector having the rotary polygon mirror 5 is guided to the photosensitive drum 8 by the imaging lenses 61 and 62 having fθ characteristics and the folding mirror 7, and focused on a minute spot on the photosensitive drum. imaged.

In FIG. 1, reference numeral 9a denotes a horizontal synchronization detection sensor for determining the writing position of an image, and reference numeral 9b denotes a reflection mirror for guiding laser light to the horizontal synchronization detection sensor 9a. Here, the optical scanning device S is formed by covering the optical box 10 with a lid member (not shown).

<Laser light source device>
Next, the laser light source device R mounted on the optical scanning device S will be described with reference to FIGS. 2, 3, and 4. FIG. FIG. 2 is a diagram showing the shape of the collimator lens 1 according to this embodiment. FIG. 3 is a configuration diagram of the laser light source device R. As shown in FIG. FIG. 4 is a diagram showing the positional relationship of the adhesive portion of the holder member 2 with respect to the light beam passage area of the collimator lens 1, when the laser light source device R is viewed from the collimator lens 1 side.

As shown in FIG. 3, the laser light source device R holds a semiconductor laser 3 as a light source, a collimator lens 1 for collimating the laser light emitted from the semiconductor laser 3, the semiconductor laser 3 and the collimator lens 1. It has a holder member 2 that does.

In FIG. 2, a collimator lens 1 collimates laser light emitted from a semiconductor laser 3 . The collimator lens 1 is made of synthetic resin and has a cylindrical lens portion 1a having a lens effective surface 13 having a convex surface for condensing laser light emitted from the semiconductor laser 3. As shown in FIG. An adhered portion 14 that is adhered and fixed to the holder member 2 via an adhesive is provided on the outer peripheral surface of the lens portion 1a. Protrusions 11 and 12 projecting outward from the side surfaces of the cylinder are provided on the outside of the lens portion 1a. In this embodiment, two protrusions 11 and 12, a first protrusion and a second protrusion, are provided. The protrusions 11 and 12 are arranged point-symmetrically to each other and have planes 11a and 11b and planes 12a and 12b, respectively. The plane 11b of the protrusion 11 is the area between the straight lines 11b1 and 11b2, as shown in FIG. The plane 12b is the area between the straight lines 12b1 and 12b2, as shown in FIG. The area from the point where the collimator lens intersects the straight line 11b2 to the point where it intersects the straight line 12b2 below the collimator lens in FIG. The adherend portion 142 is a surface, and is arranged to face the surface 22c of the adherend portion 22 with a certain gap therebetween. The adhesive enters this gap and hardens to bond and fix the bonding portion and the adhered portion. For the convenience of explanation later, the following is stated. The protrusion 11, which is the first protrusion, has an eleventh plane 11a and a twelfth plane 11b, which are the first planes. A normal to the first plane is called a first normal, and its direction is called a first normal direction. Moreover, the protrusion 12, which is the second protrusion, has a 21st plane 12a and a 22nd plane 12b, which are the second planes. A normal to the second plane is called a second normal, and its direction is also called a second normal direction. The collimator lens 1 of this embodiment has at least a lens portion 1a and a projection portion 1b.

As shown in FIGS. 3 and 4, the holder member 2 holds the semiconductor laser 3 on one end side and the collimator lens 1 on the other end side. The semiconductor laser 3 is fixed and held in a press-fitting hole on one end side of the holder member 2 by press-fitting.

Adhesive portions 21 and 22 for adhesively fixing the collimator lens 1 with an adhesive are provided at the tip (the other end portion side) of the holder member 2 so as to face each other. These two adhesive portions 21 and 22 are arranged so that a straight line connecting the adhesive portions 21 and 22 passes through the center of the circular lens effective surface 13 of the collimator lens 1 . A lens seating surface 23 is provided between the two bonding portions 21 and 22 on the other end side of the holder member.

Here, a light ray passage area E passing through the collimator lens 1 due to the rectangular diaphragm provided inside the holder member 2 is the hatched area shown in FIG. In the holder member 2, the two bonding portions 21 and 22 are arranged on the long sides of the rectangular diaphragm. Therefore, a sufficient distance from the light beam passage area E is ensured.

In this embodiment, a configuration using a rectangular diaphragm is described, but the shape of the diaphragm is not limited to this, and the same effect can be obtained even if the shape of the diaphragm is, for example, circular or elliptical. Further, the position of the diaphragm is not limited to the inside of the holder member 2, and may be constructed in the optical box 10. FIG.

<Adhesion adjustment process>
Next, the steps of bonding and fixing the collimator lens 1 to the bonding portions 21 and 22 of the holder member 2 will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing the step of applying the adhesive B. As shown in FIG. FIG. 6 is a view of the laser light source device R showing the process of UV irradiation, viewed from the collimator lens 1 side. FIG. 7 is a detailed view showing the positional relationship between the flat surfaces 11a, 11b and flat surfaces 12a, 12b of the collimator lens 1 and the adhesive portions 21, 22. As shown in FIG. FIG. 10 is also a detailed view showing the positional relationship between the collimator lens and the adhesive portion.

The collimator lens 1 is temporarily placed on the lens seating surface 23 of the holder member 2 . The collimator lens has a lens portion 1a and a projection portion 1b projecting from the lens portion to the outside of the lens portion. In this state, the adhesive reservoirs 21a and 22a provided in the adhesive portions 21 and 22 are filled with the ultraviolet curable adhesive B by the adhesive applying tool 300. As shown in FIG. Adhesive reservoirs 21a and 22a are provided with inclined portions 21b and 22b which are inclined downward from the outside of holder member 2 toward the inside (lens holding side). The adhesive B filled along the inclined portions 21b and 22b flows into the gap between the adhesive portions 21 and 22 and the adherend portion (adhesion surface) 14 of the collimator lens 1 (FIG. 10).

Next, the collimator lens 1 is clamped at three points on its outer peripheral surface by a tool (not shown), and its position is adjusted in the directions of arrows X (main scanning), Y (sub-scanning) and Z (focus) shown in FIG.

Here, in the process of applying the adhesive B and the process of adjusting the collimator lens 1, the collimator lens 1 is lifted from the temporary placement seat 23 for adjustment. Therefore, there is a possibility that the adhesive B will run on the lens effective surface 13 of the collimator lens 1 and block the light beam, resulting in a decrease in the light amount and a deterioration in the spot diameter.

However, in this embodiment, the ray passage area required for the collimator lens 1 is the ray passage area E in FIG. is on the narrow side. Therefore, even if the adhesive B runs on the effective surface 13 of the lens, it can be sufficiently avoided from the light beam, so that problems such as a decrease in the amount of light and a deterioration in the spot diameter do not occur.

6, 7, and 10, the process of curing the adhesive B with the UV light L and bonding and fixing the collimator lens 1 to the holder member 2 will be described.

First, since the position of each component when the UV light L is incident upon adhesion and fixation is related, the positional relationship will be described in detail.

A plurality of first planes 11a, 11b and second planes 12a, 12b respectively formed on the first protrusion 11 and the second protrusion 12 of the collimator lens 1 are adhered so that normal lines N passing through the respective planes face each other. It is provided at a position that intersects with the portion 21 and the bonding portion 22 . The first planes 11a and 11b and the second planes 12a and 12b are arranged so as to overlap at least a part of the respective bonding portions 21 and 22 when viewed in the normal direction.

In the above description, the relationship between the holder member and the bonded portion is described, but the positional relationship between the collimator lens 1 and the bonded portion is as follows (FIG. 10). A plurality of first planes 11a, 11b and second planes 12a, 12b respectively formed on the first and second protrusions 11, 12 of the collimator lens 1 are arranged such that normal lines N passing through the respective planes face each other. It is provided at a position that intersects the portions 141 and 142 . The first planes 11a and 11b and the second planes 12a and 12b are arranged so as to overlap at least a part of the adherend portions 141 and 142 when viewed in the normal direction. The plane is preferably provided so as to overlap the bonding portion by 50% to 100% when the entire bonding portion is 100% when viewed in the normal direction of the plane. Similarly, when the entire surface of the part to be adhered is taken as 100% when viewed in the normal direction of the plane, the plane is preferably provided so as to overlap the adhesion part within the range of 50% to 100%.

The adhered portion 141 of the lens portion 1a of the collimator lens is provided on a straight line 11b1 that is parallel to the normal to the first plane and passes through the end portion 11be of the first plane that is farthest from the lens portion 1a. The adhesion part 21 is also provided on the straight line 11b1. In this embodiment, the adherend portion 141 is provided on a straight line 12b1 that is parallel to the normal to the second plane and passes through the end portion 12be of the second plane that is farthest from the lens portion 1a. The bonding portion 21 is also provided on the straight line 12b1. Further, adhesive reservoirs are provided on the straight lines (11b1, 12b1) for accumulating the adhesive in the adhesive portion.

It is preferable that the normal line of the first plane lies between the straight lines 11b1 and 11b2, and the bonding portion and the bonded portion are provided in the region sandwiched between these two straight lines. Similarly, the normal line of the second plane is between the straight lines 12b1 and 12b2, and it is preferable that the bonding portion and the bonded portion are provided in the region sandwiched between these two straight lines.

The bonded part 141 of the lens part of the present embodiment can receive two UV rays L in the area between the point 14111b1 that intersects the straight line 11b1 and the point 14112b1 that intersects the straight line 12b1, so that the adhesion can be performed more efficiently. The agent can be cured. Further, the bonding portion 21 of the holder member of the present embodiment can receive two UV rays L in the region between the point 11b21 that intersects the straight line 11b1 and the point 12b21 that intersects the straight line 12b1. Allow the adhesive to cure.

The bonding portion 21 is irradiated with UV rays from the planes 11b and 12b. Since the range of the normals of the planes 11b and 12b is sufficiently wider than the bonding portion 21, the normal N intersects the bonding portion even after the collimator lens 1 is adjusted. The same applies to the flat surfaces 11a and 12a with respect to the bonding portion 22. As shown in FIG.

The UV irradiators 200 are arranged at positions facing the planes 11a, 11b and the planes 12a, 12b of the collimator lens 1, respectively. The UV irradiator 200 is arranged so that the UV light L emitted from the UV irradiator 200 is radiated in the normal direction of these planes 11a, 11b and planes 12a, 12b.

In this way, the bonding portions are provided in the normal direction of the flat surfaces 11a, 11b and the flat surfaces 12a, 12b provided on the projections 11, 12 of the collimator lens 1, and the UV light L is irradiated along the normal. As a result, the UV light L is incident on the planes 11a, 11b and planes 12a, 12b of the collimator lens 1 perpendicularly. Therefore, the collimator lens 1 does not refract the UV light L, and the UV light L can be efficiently guided to the adhesive portion filled with the adhesive B. FIG.

By efficiently irradiating the adhesive portion with the UV light L, the curing time of the adhesive B can be shortened, thereby improving productivity. In addition, since the adhesive can be prevented from being uncured, the position of the collimator lens 1 after adhesion is more stable, and environmental fluctuations and changes over time are less likely to occur.

In addition, since there is no illuminance unevenness in the direction of the arrow Z, there is no time lag for curing the adhesive B, and the positional fluctuation of the collimator lens 1 in the direction of the arrow Z (focus) due to curing shrinkage of the adhesive B can be reduced. It is possible.

Furthermore, since the irradiation heat due to unnecessary UV irradiation can be reduced, thermal deformation of the collimator lens 1 and the holder member 2 can be suppressed, and deterioration of optical characteristics can be prevented.

Through the above steps, the collimator lens 1, the holder member 2 and the semiconductor laser 3 are integrated to form the laser light source device R. FIG.

In this embodiment, the adhesive portions 21 and 22 of the holder member 2, the projecting portions 11 and 12 of the collimator lens 1, the flat surfaces 11a and 11b, and the flat surfaces 12a and 12b are provided at two locations. However, the numbers of these adhesive portions, protrusions, and flat surfaces are not limited, and it is sufficient that they are arranged equally in the circumferential direction of the holder member 2 to which the collimator lens 1 is adhered.

As described above, the collimator lens 1 is provided with the protrusions 11 and 12, which are provided with the planes 11a and 11b and the planes 12a and 12b, respectively. As a result, refraction of the UV light L incident on the collimator lens 1 can be prevented, the UV light L can be efficiently guided to the adhesive portions 21 and 22, and the adhesive B can be sufficiently cured. . As a result, the curing time can be shortened, and positional fluctuation of the collimator lens that occurs during adhesive fixing can be suppressed, and an assembly process with high reliability and productivity can be realized.

Note that the collimator lens 1 described in this embodiment is not limited to a resin lens, and may be a composite collimator lens made of glass or glass and resin.

In this embodiment, a holder member separate from the optical box is used as a component of the light source device, and the holder member holds the semiconductor laser and the collimator lens. It is not limited. For example, the same effect can be obtained by directly press-fitting the semiconductor laser into an optical box (holder member) that constitutes the optical scanning device, providing an adhesive portion to the optical box, and adjusting and adhering the collimator lens.

In addition, unless otherwise specified, the dimensions, materials, shapes, quantities, optical arrangements, etc. of components are not intended to limit the scope of the present invention.

As for the adhesive, although an ultraviolet curable adhesive is used, other photocurable adhesives can also be used.

Further, in this embodiment, an optical scanning device that irradiates a single photosensitive drum with a laser beam has been described as an example, but the present invention is not limited to this. A similar effect can be obtained by applying the present invention to a light source device in an optical scanning device that irradiates a plurality of photoreceptors with laser light.

In this embodiment, the configuration of the optical scanning device (see FIG. 1) that exposes from the upper side of the photosensitive drum (image carrier) has been exemplified, but the present invention is not limited to this. Equivalent effects can be obtained by applying the present invention to a light source device in an optical scanning device that exposes from the side or bottom of the photosensitive drum.

<Image forming apparatus>
The overall configuration of an image forming apparatus including an optical scanning device using a light source device having a collimator lens will be described below together with the operation during image formation with reference to the drawings. In this embodiment, an optical operating device that exposes the photosensitive drum from the side is used.

As shown in FIG. 9, the image forming apparatus A includes an image forming section for transferring a toner image as a developer image onto a sheet as a recording material, a sheet feeding section for feeding the sheet toward the image forming section, a sheet and a fixing unit that fixes the toner image to the toner image.

The image forming section includes a process cartridge P detachable from the main body of the image forming apparatus A, an optical scanning device S, a transfer roller 97, and the like. The process cartridge P also includes a photosensitive drum 98 as a rotatable photosensitive member, a charging roller 920, a developing device 91, a cleaning blade 922, and the like. An optical bench 917 made of sheet metal is provided at the opposite portion of the process cartridge P, and an optical scanning device S as an optical scanning unit is installed on the optical bench 917 .

Both ends of the transfer roller 97 are rotatably supported by bearing members. The transfer roller 97 is provided so as to apply a predetermined contact pressure to the surface of the photosensitive drum 98 by means of a pressing spring 97b attached to a bearing member.

A fixing device 99 as a fixing section includes a pressure roller 99b and a heating roller 99a rotatably supported with respect to a frame 99c, and both form a fixing nip section. The frame 99c of the fixing device 99 is fixed to the upper surface of the side plate 915 of the main body of the image forming apparatus A with screws.

An opening/closing door 913 that can be opened and closed by rotating with respect to the main body of the image forming apparatus A is provided on the upper portion of the image forming apparatus A. As shown in FIG. A user can attach and detach the process cartridge P to and from the apparatus main body of the image forming apparatus A by opening the opening/closing door 913 .

Next, the image forming operation will be described. When forming an image, first, when the controller receives an image forming job signal, the sheet SH stacked and accommodated in the sheet stacking unit 94 is sent to the registration roller 96 in a stopped state by the feeding roller 95 and the conveying roller 911 . Next, the sheet SH is abutted against the nip portion of the registration roller 96, and after the skew is corrected by its stiffness, the registration roller 96 rotates at a predetermined timing, so that the photosensitive drum 98 and the transfer roller are rotated. It is transported to the transfer nip formed from 97 .

On the other hand, in the image forming section, a bias is applied to the charging roller 920 to charge the surface of the photosensitive drum 98 as a photosensitive member that contacts the charging roller 920 . After that, the optical scanning device S as an optical scanning unit emits a laser beam LA from a light source, and irradiates the photosensitive drum 98 with the laser beam LA according to image information. As a result, the potential of the photosensitive drum 98 as a photosensitive member is partially lowered, and an electrostatic latent image corresponding to the image information is formed on the surface of the photosensitive drum 98 .

Thereafter, a bias is applied to a developing sleeve 921 provided in a developing device 91 as a developing section, whereby toner is adhered from the developing sleeve 921 to an electrostatic latent image formed on the surface of a photosensitive drum 98 as a photoreceptor to form a toner image. is formed.

Next, the toner image formed on the surface of the photosensitive drum 98 is sent to the transfer nip portion formed by the photosensitive drum 98 and the transfer roller 97 . When the toner image reaches the transfer nip portion, a bias having a polarity opposite to that of the toner is applied to the transfer roller 97 to transfer the toner image onto the sheet SH. Toner remaining on the photosensitive drum 98 after the transfer of the toner image is scraped off by the cleaning blade 922 and removed.

Thereafter, the sheet SH onto which the toner image has been transferred is sent to the fixing device 99, and heated and pressurized in the course of passing through the fixing nip portion of the fixing device 99, so that the toner image is thermally melted and thermally fixed onto the sheet SH. . Thereafter, the sheet SH is discharged by the discharge roller 910 to the discharge portion 913a.

B: Adhesive E: Light ray passage area L: UV ray N: Normal line R: Laser light source device 1: Collimator lens (collecting lens)
2 ... holder member 3 ... semiconductor laser (light source)
4 ... Cylindrical lens 5 ... Rotating polygon mirrors 11, 12 ... Protrusions 11a, 11b, 12a, 12b ... Flat surface 13 ... Lens effective surface 14 ... Adhesive parts 21, 22 ... Adhesion parts 21a, 22a ... Adhesion pools 21b, 22b ... Slanted portion 23 ... Lens seat surfaces 61, 62 ... Imaging lens 200 ... UV irradiator 300 ... Adhesive application tool

Claims (19)

A collimator lens held by a holder member,
a cylindrical lens portion having a region through which light passes;
a projecting portion projecting from the lens portion in the radial direction of the cylinder when the collimator lens is viewed in the optical axis direction of light ;
When the collimator lens is viewed in the optical axis direction, the lens portion is provided on the outer peripheral surface of the lens portion and is adhered and fixed to the adhesive portion provided on the holder member via an adhesive. has
the protrusion has a flat surface provided on the outer peripheral surface of the protrusion when the collimator lens is viewed in the optical axis direction ;
The collimator lens, wherein the plane is provided at a position where a normal line of the plane intersects the adherend portion when the collimator lens is viewed in the optical axis direction . A collimator lens held by a holder member,
a cylindrical lens portion having a region through which light passes;
a projecting portion projecting from the lens portion in the radial direction of the cylinder when the collimator lens is viewed in the optical axis direction of light ;
When the collimator lens is viewed in the optical axis direction, the lens portion is provided on the outer peripheral surface of the lens portion and is adhered and fixed to the adhesive portion provided on the holder member via an adhesive. has
the protrusion has a flat surface provided on the outer peripheral surface of the protrusion when the collimator lens is viewed in the optical axis direction ;
A collimator lens, wherein the plane is provided so as to overlap at least a part of the adherend when viewed in a normal direction of the plane. 3. The collimator lens according to claim 1, wherein the collimator lens is adhesively fixed to the holder member at two points. The collimator lens has two protrusions ,
4. The collimator lens according to claim 1, wherein the two protrusions are arranged point-symmetrically with each other when the collimator lens is viewed in the optical axis direction . 5. The adherend portion is provided on a straight line passing through an end portion of the flat surface that is parallel to the normal line and farthest from the lens portion. collimator lens described in . The adhesive part has an adhesive pool for storing adhesive,
6. The collimator lens according to claim 5, wherein said adhesive reservoir is provided on said straight line. When the projection is the first projection, the plane is the first plane, and the normal is the first normal,
The collimator lens has a second protrusion having a second plane,
2. The collimator lens according to claim 1, wherein the second plane is provided at a position where a second normal line of the second plane intersects the adherend portion. When the projection is the first projection, the plane is the first plane, and the normal is the first normal,
The collimator lens has a second protrusion having a second plane,
3. The collimator lens according to claim 2, wherein the second plane is provided so as to overlap at least a part of the adherend portion when viewed in the second normal direction of the second plane. When viewed in the first normal direction of the first plane, a portion of the adherend portion overlapping the first plane is the second plane when viewed in the second normal direction of the second plane. 9. The collimator lens according to claim 8, wherein the portion is the same as the portion of the adherend portion that overlaps with the . The plane is provided so as to overlap the bonding portion within a range of 50% to 100% when the entire bonding portion is 100% when viewed in the normal direction of the plane. 3. The collimator lens according to claim 2. The plane is provided so as to overlap the surface of the adherend within a range of 50% to 100% when the entire surface of the adherend is defined as 100% when viewed in the normal direction of the plane. 3. The collimator lens according to claim 2, wherein the collimator lens is A light source device comprising: a light source; the collimator lens according to any one of claims 1 to 11; and a holder member that holds the light source and the collimator lens. 3. The holder member has a plurality of adhesive portions for adhesively fixing the collimator lens, and the plurality of adhesive portions are equally spaced in a circumferential direction of the collimator lens. 13. The light source device according to 12. The holder member has two bonding portions,
13. The light source device according to claim 12, wherein the two bonding portions are provided facing each other such that a straight line connecting the two bonding portions passes through the center of the collimator lens. 13. The light source device according to claim 12, wherein the adhesive portion is arranged on a longer side of a light beam passage area passing through the collimator lens by a rectangular diaphragm provided inside the holder member. 13. The light source according to claim 12, wherein the adhesive portion of the holder member has an adhesive pool for filling an adhesive between the adhered portion of the collimator lens and the adhesive portion of the holder member. Device. 17. The light source device according to claim 16, wherein the adhesive reservoir has an inclined portion that is inclined downward from the outside to the inside of the holder member. a light source device according to any one of claims 12 to 17;
and a deflector having a rotating polygonal mirror that deflects the laser beam emitted from the light source device. an optical scanning device according to claim 18;
an image carrier irradiated with a deflected laser beam to form a latent image on its surface;
An image forming apparatus for forming an image on a recording material by developing the latent image to form a developer image and transferring the developer image to the recording material.

Images