JPH0792363A - Optical image recorder - Google Patents

Abstract

PURPOSE:To provide an optical image recorder in which a mechanism for fixing an optical lens is simply constituted and in which work for attaching the optical lens is more simplified. CONSTITUTION:As to this optical image recorder using an optical system which is attached to a supporting body 3, is constituted of a material capable of being easily molded into the various kind of shapes, and has at least one optical lens 1; a reference hole part 1a for positioning which fixes the lens 1 by means of only fitting to the attaching part 3a of the supporting body 3 is formed on the lens 1.

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 which is used in a laser printer or the like and which simplifies attachment of various optical lenses.

[0002]

2. Description of the Related Art Conventionally, various optical lenses are arranged in an optical image recording apparatus used in a laser printer or the like. For example, as shown in FIG. 8, the conventional configuration of the fixing mechanism of the cylindrical lens is such that after the cylindrical lens 11 is fitted into the lens frame 10 having the stepped depression and the hole, the rubber pressers 12a and 12b are used for both sides. Then, the cylindrical lens 11 is fixed to the lens frame 10 with a plurality of screws 14 from above by a pressing metal 13 as shown in FIG. As described above, the mechanism for fixing this type of optical lens at a predetermined position is complicated and the number of parts is large. If such a configuration is adopted for all optical lenses, the optical system alone becomes considerably complicated, and the mounting work requires a considerable number of man-hours.

As a solution to this problem, for example, Japanese Patent Laid-Open No. 61-
Japanese Patent No. 149912 discloses a structure in which a mounting portion having a hole formed in a plastic lens is integrally formed, and the mounting portion is screwed to a support body.
Japanese Laid-Open Patent Publication No. 47010 discloses a configuration in which a projection or a recess is provided substantially at the optical axis position of the optical lens in the scanning direction, thereby holding the optical lens.

[0004]

However, in the above-mentioned conventional optical image recording apparatus, the plastic lens having the mounting portion integrally molded with the optical lens requires the work of screwing, which is further simplified. That was what was desired. Further, although the same is true for the case where the projection or the recess is provided at the optical axis position, there is a problem that it is not easy to obtain high accuracy with respect to the mounting position of the optical lens. Therefore, the present invention solves the conventional problems described above, and the mechanism for fixing the optical lens is simple,
An object of the present invention is to provide an optical image recording device in which the work of attaching an optical lens is further simplified.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical image using an optical system mounted on a support and made of a material that can be easily molded into various shapes and having at least one optical lens. In the recording apparatus, the optical lens is provided with a positioning reference hole portion for fixing the optical lens to the mounting portion of the support body only by fitting.

[0006]

According to the first aspect of the invention, the positioning reference hole portion of the optical lens is fixed to the mounting portion of the support body only by fitting. According to the invention of claim 2, the reference surface in the optical axis direction of the positioning reference hole facilitates the reference position alignment of the optical lens in the optical axis direction. Further, in the invention of claim 3, the reference surface of the positioning reference hole portion in the direction orthogonal to the optical axis direction facilitates the reference positioning in the direction orthogonal to the optical axis direction of the optical lens. Further, according to the invention of claim 4, the reference plane in the optical axis direction of the positioning reference hole portion and the reference surface in the direction orthogonal thereto facilitates the reference alignment in the optical axis direction of the optical lens and the direction orthogonal thereto. Become.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is fθ which is an optical lens.
Shows the lens. The fθ lens 1 is formed with a positioning reference hole portion 1a having a reference surface 1b in the optical axis direction.
As a material of the fθ lens 1, a material that can be easily molded into various shapes, for example, an optical plastic such as an acrylic resin is used. Similarly, in FIG. 3, a positioning reference hole 2a having a reference surface 2b on the cylindrical lens 2 is provided.
It shows an example of forming. On the other hand, as shown in FIG.
A protrusion 3a having a reference surface 3b is formed on the housing 3, which is a support, in the optical axis direction. In this configuration, the reference surface 1 of the positioning reference hole portion 1a of the fθ lens 1
If b is pressed against the reference surface 3b of the reference protrusion 3a of the housing 3 and is fitted and fixed only by this fitting, the lens can be positioned and fixed in the optical axis direction at the same time.

Further, FIG. 4 shows fθ in the second embodiment.
The lens 4 is shown. The fθ lens 4 is formed with a positioning reference hole 4a having a reference surface 4b in a direction orthogonal to the optical axis direction. On the other hand, as shown in FIG. 5, the housing 5 as a support is provided with a protrusion 5a having a reference surface 5b in a direction orthogonal to the optical axis. In this configuration, the positioning reference hole portion 4a of the fθ lens 4 is fitted into the reference projection portion 5a of the housing 5 and fixed only by this fitting, thereby positioning and fixing the lens in the direction orthogonal to the optical axis direction. Are done at the same time.

Further, FIG. 6 shows f in the third embodiment.
The θ lens 6 is shown. The fθ lens 6 is formed with a positioning reference hole 6a having a reference surface 6b in the optical axis direction and a reference surface 6c in the direction orthogonal to the optical axis direction. On the other hand, FIG.
As shown in FIG. 3, the housing 7 as a support has a reference surface 7b in the optical axis direction and a reference surface 7c in the direction orthogonal to the optical axis direction.
A rectangular protrusion 7a having a is formed. In this structure, the positioning reference hole portion 6a of the fθ lens 6 is fitted into the protrusion portion 7a of the housing 7, and the fitting is fixed only by this fitting, so that positioning and fixing of the lens in the optical axis direction and the orthogonal direction can be performed at the same time. Done.

[0010]

As described above, according to the first aspect of the invention, the optical lens is provided with the positioning reference hole portion for fixing it to the mounting portion of the support body only by fitting. Therefore, the structure can be simplified, and the lens mounting work can be easily performed. According to the invention of claim 2,
Since the positioning reference hole has at least one reference surface in the optical axis direction, the reference position in the optical axis direction of the lens can be easily adjusted. According to the invention of claim 3, since the positioning reference hole portion has at least one reference surface in a direction orthogonal to the optical axis direction, reference positioning in a direction orthogonal to the optical axis direction of the lens is performed. Can be done easily. According to the invention of claim 4, since the positioning reference hole portion has both reference surfaces in the optical axis direction and a direction orthogonal to the optical axis direction, the optical axis direction of the lens and the direction orthogonal thereto. The reference position can be easily adjusted.

[Brief description of drawings]

FIG. 1A is a perspective view of an fθ lens according to a first embodiment of the present invention, and FIG. 1B is a bottom view of the same.

FIG. 2 is a side view showing an example of a support body of an fθ lens.

3A is a perspective view of a cylindrical lens according to a first embodiment of the present invention, and FIG. 3B is a front view thereof.

FIG. 4A is a perspective view of an fθ lens according to a second embodiment of the present invention, and FIG. 4B is a bottom view of the same.

5 is a front view showing a support of the fθ lens of FIG. 4. FIG.

FIG. 6 is a bottom view of an fθ lens according to a third embodiment of the present invention.

7 is a perspective view showing a support of the fθ lens of FIG.

FIG. 8 is an exploded perspective view showing an example of a conventional fixing mechanism for a cylindrical lens.

[Explanation of symbols]

 1, 2, 4, 6 Optical lens 3, 5, 7 Support 1a, 2a, 4a, 6a Positioning reference hole 1b, 2b, 4b, 6b, 6c, Reference plane

Claims (4)

[Claims] 1. An optical image recording apparatus using an optical system, which is attached to a support and is made of a material that can be easily molded into various shapes and has at least one optical lens, wherein the optical lens includes the support. An optical image recording device, characterized in that a positioning reference hole portion is formed in the mounting portion for fixing by simply fitting. 2. The optical image recording apparatus according to claim 1, wherein the positioning reference hole portion has at least one reference surface in the optical axis direction. 3. The optical image recording apparatus according to claim 1, wherein the positioning reference hole portion has at least one reference surface in a direction orthogonal to the optical axis direction. 4. The optical image recording apparatus according to claim 1, wherein the positioning reference hole portion has reference surfaces in both an optical axis direction and a direction orthogonal to the optical axis direction.