JP3157586B2 - Optical image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical image recording apparatus using an optical lens. The present invention is applicable to an optical image forming apparatus such as a camera, a facsimile, a laser printer, various copying machines, and the like.

[0002]

2. Description of the Related Art There is an optical image recording apparatus using an optical system having at least one optical lens. An example is a laser printer, in which a wide variety of optical lenses are arranged.

As a means for fixing this kind of optical lens in a predetermined position, a plastic lens having a mounting portion integrally formed is formed by making a hole in the mounting portion and screwing it (Japanese Patent Laid-Open No. 61-149912). Japanese Patent Application Laid-Open No. Sho 62-4 / 1989, a projection or a concave portion is provided at a position substantially along the optical axis of the optical element in the scanning direction, and the projection or the concave portion is held thereby.
No. 7010).

[0004] Specifically, as shown in FIG.
After the cylindrical lens 1 is fitted into the recess, rubber holders 3a and 3b are used to hold the cylindrical lens 1 on both sides. Some are fixed at 5.

[0005]

In the conventional configuration, the fixing mechanism is complicated and the number of parts is large. Therefore, if such a configuration is applied to all the optical lenses, the optical system alone becomes considerably complicated, and the mounting work requires considerable man-hours.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical image recording apparatus capable of simplifying a mechanism for holding an optical lens and improving mounting workability.

[0007]

In order to achieve the above object, the present invention has one of the following constitutions.

(1). In an optical image recording apparatus using an optical system having at least one optical lens, using a material that can be molded into various shapes as the optical lens, and forming a positioning reference projection integrally with the lens, At least one surface of the reference projection is aligned with the parting line (claim 1).

(2). In an optical image recording apparatus using an optical system having at least one optical lens, using a material that can be molded into various shapes as the optical lens, and forming a positioning reference projection integrally with the lens, The reference projection is provided on the gate side with respect to the sub-scan section including the optical axis.

(3). In an optical image recording apparatus using an optical system having at least one optical lens, using a material that can be molded into various shapes as the optical lens, and forming a positioning reference projection integrally with the lens, A reference projection is formed integrally with the lens, and the positioning reference projection is used as a molding gate.

[0011]

The lens is positioned and fixed using the positioning reference projection.

[0012]

Reference Example 1 (Refer to FIG. 1. Related to Claim 1) In the figure, a square columnar positioning reference projection 7a is formed at a position corresponding to the side surface of a cylindrical lens 7 by integral molding with the lens. The projection is formed. As a material of the lens, a material which can be easily formed into various shapes, for example, an optical plastic is used.

On the other hand, a hole 6a having a size and shape capable of fitting with the reference projection 7a is formed substantially at the center of the rectangular plate-shaped housing 6 to which the cylindrical lens 7 is attached.

Therefore, if the reference projection 7a is fitted into the hole 6a, the positioning of the lens and the mounting operation can be completed simultaneously. In addition, as for the attachment of the lens, an adhesive may be used as necessary, or if the housing is made of plastic, the lens may be fixed by melting and fixing by heat. The housing 6
Is fixed at a predetermined position of the optical image recording apparatus by an appropriate means.

REFERENCE EXAMPLE 2 (See FIG. 2. Related to Claim 1) This example is an example relating to the fθ lens 9 except that the type of lens is different from that of the above example, and the other configuration is the same as that of the above reference example 1. .

A positioning reference projection 9a is provided on the side surface of the lens, and a hole 8a is formed in the housing 8, and the lens is attached and fixed according to the above-described example.

REFERENCE EXAMPLE 3 (See FIG. 3) This example relates to an improvement of the reference example 2. In FIG. 3, f
A positioning reference protrusion 11a is integrally formed on a side surface (corresponding to a bottom surface in the illustrated example) of the θ lens 11.

In this embodiment, at least one surface of the reference projection 11a, in the example shown in the figure, the reference surface 11b is accurately formed with a predetermined positional relationship with respect to the optical axis OO as a mounting position reference. Have been.

On the other hand, with respect to the hole 10a of the housing 10, the hole 10a corresponds to the surface corresponding to the reference surface 11b, and the contact surface 10a 'corresponds to a predetermined reference surface (not shown) of the housing 10 for the optical image recording apparatus. It is formed accurately so as to have a predetermined positional relationship. In this case, the surface 10a 'and the optical axis OO need not necessarily be orthogonal to each other.

In this embodiment, the positioning and fixing of the lens in the optical axis direction can be performed simultaneously and easily simply by fitting the positioning reference projection 11a into the hole 10a.

Reference Example 4 (See FIG. 4) In this example, the reference projection 13a for positioning is provided on the fθ lens 13.
A reference surface 13b is formed on one surface of the reference protrusion in the lens longitudinal direction. This reference plane 13b
Is a plane that coincides with a sub-scanning section orthogonal to the main scanning plane. That is, it is a surface that regulates the position of the fθ lens 13 in the longitudinal direction.

The housing 12 is formed with a hole 12a to be fitted with the positioning reference projection 13a. By fitting the positioning reference projection 13a into the hole 12a, the reference surface 13b is in close contact with the reference surface of the hole 12a, coincides with the sub-scan section, and the lens is positioned at a predetermined position in the longitudinal direction. It is positioned and fixed.

Reference Example 5 (See FIG. 5) This example is a modification of the above-described Reference Example 4, and shows the relationship between the lens and the housing in FIG. 5A and the lens as viewed from the optical axis direction. Referring to FIG. 5B, the fθ lens 15
Is formed with a positioning reference projection 15a.

A reference surface 15b is formed on one side of the reference protrusion in the lens longitudinal direction. This reference plane 15b is
The plane coincides with the sub-scanning cross section including the optical axis OO. The housing 14 is formed with a hole 14a that fits with the positioning reference projection 15a.

The reference plane 15b is a plane that coincides with the sub-scan section including the optical axis OO. The housing 14 is formed with a hole 14a that fits with the positioning reference projection 15a.

Therefore, if the positioning reference projection 15a is fitted and fixed in the hole 14a, the positioning and fixing in the longitudinal direction of the lens can be performed at the same time, and the same as the mounting reference when measuring the eccentricity in the production of the lens. It is also an eccentricity standard to be installed under conditions.

REFERENCE EXAMPLE 6 (see FIG. 6) This example is a modification of the reference example 4 described above,
The reference projection 18a for positioning is formed on one side, and a reference surface 18b is formed on one surface of the reference projection in the lens longitudinal direction. This reference plane 18b is a plane that coincides with the sub-scan section.

A reference plane 18c orthogonal to the optical axis OO is formed at both ends in the longitudinal direction of the lens 18 and not used for image scanning.

On the other hand, the housing 17 is formed with a hole 17a for fitting with the positioning reference projection 18a.
A block is provided on the housing surface, and a contact surface 17b of a reference surface 18c is formed on the surface of the block.

Therefore, after the positioning reference projection 18a is fitted into the hole 17a, the reference surface 18b is brought into contact with the corresponding surface of the hole 17a, and the reference surface 18c is brought into contact with the contact surface 17b. And the lens can be fixed in two directions of the longitudinal direction 12 and the optical axis direction.

Reference Example 7 (See FIG. 7) In this example, as shown in FIG. 7, a reference projection 20a for positioning is integrally formed on the fθ lens 20. If the reference projection 20a for positioning is provided with a reference surface 20b that matches a cross section orthogonal to the optical axis OO, and a contact surface 19b is provided in the hole 19a of the housing 19, positioning of the lens in the optical axis direction can be achieved. Fixation can be performed simultaneously.

Reference Example 8 (see FIG. 8) In this example, the positioning reference projection 21 is attached to the fθ lens 21.
a is formed integrally. A reference surface 21b as a reference surface in Reference Examples 4 to 8 is formed on the positioning reference protrusion 21a, and the surfaces other than the reference surface have gradients bc / 2L and a. / L. This orientation gradient facilitates the operation of removing the lens molding die.

Embodiment 1 (See FIG. 9. Corresponding to claim 1) In this embodiment, as shown in FIG. 9A which is a plan view of a lens, and FIG. And a positioning reference projection 22a formed integrally therewith. In this example, one surface 2 of the positioning reference projection 22a
2b coincides with the mold parting line PL.

When the lens is formed in this manner, it is only necessary to form a hole for the positioning reference projection on only one side of the mold, so that the manufacture of the mold is facilitated, and the influence of molding is minimized. Lens performance.

Embodiment 2 (See FIG. 10. Corresponding to claim 2) In this embodiment, as shown in the plan view of FIG. 10A and the side view of FIG. The projection 24a is formed integrally. The positioning reference projection 24a is provided closer to the gate (gate) 26 than the sub-scan section including the optical axis OO.

In this manner, during molding, the effect of molding is avoided from affecting the lens performance despite the large shrinkage rate on the gate portion 26 side.

Embodiment 3 (Refer to FIG. 11. Corresponding to Claim 3) In this embodiment, a positioning reference projection and a gate are also used. As shown by reference numeral 27 a in FIG.
7 has a dual-purpose projection integrally formed therewith. By fitting the tip projection of the dual projection 27a into the hole 28a of the housing 28, positioning of the lens and
Fixation can be performed simultaneously.

[0038]

According to the present invention, it is possible to provide an optical image recording apparatus in which the mechanism for holding the optical lens is simplified and the mounting workability is improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 2 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 3 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 4 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 5 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 6 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 7 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 8 is a diagram illustrating an optical lens according to the present invention.

FIG. 9 is a diagram illustrating an optical lens according to the present invention.

FIG. 10 is a diagram illustrating an optical lens according to the present invention.

FIG. 11 is a diagram illustrating an optical lens according to the present invention together with a housing.

FIG. 12 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 7 Cylindrical lens 7a Positioning reference protrusion 9 fθ lens 7a Positioning reference protrusion 11 fθ lens 11a Positioning reference protrusion 13 fθ lens 13a Positioning reference protrusion 15 fθ lens 13a Positioning reference protrusion 18 fθ lens 18a Positioning Reference projection 20 fθ lens 20a positioning reference projection 21 fθ lens 21a positioning reference projection 22 fθ lens 22a positioning reference projection 24 fθ lens 24a positioning reference projection

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Mama 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Inventor Kenshi Yamakawa 1-3-6 Nakamagome, Ota-ku, Tokyo (56) References JP-A-62-47010 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 26/10 G02B 7/02

Claims (3)

(57) [Claims] 1. An optical image recording apparatus comprising: an optical system having at least one optical lens; a material which can be molded into various shapes; and a positioning reference projection integrally formed with the lens. 3. The optical image recording apparatus according to claim 1, wherein at least one surface of the positioning reference projection is aligned with a parting line. 2. An optical image recording apparatus using an optical system having at least one optical lens, using a material that can be molded into various shapes as said optical lens, and integrally molding a positioning reference projection with said lens. 3. The optical image recording apparatus according to claim 1, wherein the positioning reference projection is provided on a gate side with respect to a sub-scan section including an optical axis. 3. An optical image recording apparatus using an optical system having at least one optical lens, using a material that can be molded into various shapes as said optical lens, and integrally molding a positioning reference projection with said lens. 3. The optical image recording apparatus according to claim 1, wherein the positioning reference projection is formed integrally with the lens, and the positioning reference projection is used as a molding gate.