JPS61175604A - Cylinder lens - Google Patents

Abstract

PURPOSE:To simplify the shape of a fitting part and to reduce the sticking of tentacles and dust on the effective range surface of a cylinder lens by providing the cylinder lens with a positioning part in one body and projecting the outside of the effective range of the lens from the lens surface. CONSTITUTION:The positioning part 7 which has a positioning surface 7a at both sides of the generating line direction of the cylinder lens and outside the effective range A of the cylinder lens 1 at right angles to the generating line is provided to the cylinder body 1 in one body by molding. The distance Dx between the positioning surfaces 7a at both sides is so set to fit a catch 5 of width dx. Then, a step part 8 which extends in the generating line direction is provided above and below outside the effective range A of the lens on the surface of the cylinder lens 1 opposite an optical fiber incidence terminal 2a, and the part between them projects. The projection part of height Dy between the upper and lower step parts 8 of the cylinder lens 1 is fitted in the recessed part of height dy between the upper and lower step parts 9 of a fitting member 4. The positioning part 9 projects from the lens surface of the effective range A of the cylinder lens 1 in the optical-axis direction.

Description

TECHNICAL FIELD The present invention relates to a cylinder lens that is positioned and mounted on a mounting member.

Prior Art In order to mount a cylinder lens with the position and direction of the optical axis aligned with the optical axis of an optical system, the mounting provided on the equipment is attached to the member in the direction of the generatrix of the cylinder lens and the end face in the direction perpendicular to the generatrix and the optical axis. It can be installed by locating the position.

Conventionally, cylinder lenses were generally made by polishing optical glass, so only the semicylindrical (or concave cylinder) part was made, and the positioning means was usually installed on the component side. . Therefore, the mounting has the disadvantage that the shape of the member is complicated and the cost is high. Further, since the cylinder lens has only a cylinder portion, it is difficult to attach the lens to a member because the lens surface is easily touched by fingers and becomes dirty, and dust and the like are likely to adhere to the lens surface.

Purpose The present invention eliminates the above-mentioned drawbacks and difficulties of the conventional cylinder lens, simplifies the shape of the component, and facilitates installation.In addition, it reduces the adhesion of tentacles and dust to the lens surface. The purpose is to provide cylinder lenses that can be used.

Structure In order to achieve the above object, the present invention has a positioning surface orthogonal to at least one of the generatrix direction of the cylinder lens and the direction perpendicular to the generatrix and the optical axis, and a lens in the effective range of the cylinder lens. It is characterized in that a positioning part protruding from the surface in the optical axis direction is molded integrally with the cylinder lens outside the effective range of the lens.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

The present invention is based on the premise that the cylinder lens is made of plastic by molding, and as a result, it has become possible to manufacture the positioning part and the cylinder lens body by molding them integrally.

1 to 3 are views showing an embodiment in which the present invention is applied to a cylinder lens and its mounting member used in a period detection unit of a laser printer, and the light beam incident on the cylinder lens 1 is transmitted to the original fiber 2. is guided to the detection section via. In order for the optical axis light incident on the cylinder lens l to enter the input part 2a of the original fiber 2 with the optical axis accurately aligned,
The cylinder lens 1 and the original fiber tip holding member 3 are as follows:
One attachment is performed by aligning the optical axis with opposite sides of the member 4 and connecting them. The holding member 4 is manufactured by molding a plastic having appropriate elasticity, and the cylinder lens 1 and the original fiber holding member 3 are connected by a cylinder between a pair of catch parts 56 utilizing the elasticity of the material of the mounting member 4, respectively. lens 1
Then, the retaining part of the original fiber retaining member 3 is pushed in and the hook part at the tip of the catch part 5.6 is hooked to hold it so that it does not fall off.

The configuration described up to this point is unchanged from the conventional one.

However, in this embodiment, positioning portions 7 having positioning surfaces 7a orthogonal to the generatrix are provided by molding integrally with the cylinder lens 1 outside the effective range A of the cylinder lens 1 on both sides in the generatrix direction of the cylinder lens. There is. The distance Dx between the positioning surfaces 7a on both sides is set to a size such that the catch 5 having the width dx fits therein. Further, on the surface of the cylinder lens 1 facing the original fiber input end 2a, step portions 8 extending in the generatrix direction are provided above and below the outside of the effective range A of the lens, and the stepped portions 8 protrude. Correspondingly, an opposite stepped portion 9 is also provided on the vertical plane between the upper and lower catch portions 5 of the mounting member 4, and the space between them is recessed.

Height D of the protrusion between the upper and lower steps 8 of the cylinder lens 1
y is the height dy of the recess between the upper and lower steps 9 of the mounting member 4
It is designed to fit. The positioning portion 7 protrudes beyond the lens surface of the effective range A of the cylinder lens 1 in the optical axis direction.

Therefore, when attaching the cylinder lens 1 to the attachment member 4, hold the outer surfaces of the positioning portions 7 on both sides with your fingers and push the attachment between the upper and lower catches 5 of the member 4, and the catches 5 will open with elasticity. When the cylinder lens reaches its depth, the protrusion between the stepped portions 8 of the cylinder lens and the recessed portion between the stepped portions 9 of the member 4 are fitted, and the position of the cylinder lens 1 in the generatrix direction is adjusted. The claws at the tip of the catch 5 fit between the positioning surfaces 7a on both sides of the cylinder lens 1 to restrain the convex lens surface of the cylinder lens 1 vertically and position it so that it will not tilt. As a result of the above, the cylinder lens 1 is mounted with respect to the member 4 in the generatrix direction, in the direction perpendicular to the generatrix and the optical axis, and in the direction of the optical axis. It can be installed with the optical axis aligned with the tip.

In other embodiments shown in FIGS. 4 to 6, when the cylinder lens 1 is installed, the outer four circumferences of the effective range of the lens surface facing outward protrude from the lens surface like a frame, preventing tentacles and dust from reaching the lens surface. It is designed to prevent the adhesion of Therefore, in this example, the positioning portions 7 on both sides in the generatrix direction are provided so as to protrude in the optical axis direction from the plane lens surface facing the mounting member. The distance DX between the inner positioning surfaces 7a is set to fit the width dx of the cylinder lens mounting portion of the mounting member 4. In addition, step portions 8 are provided on the plane side lens surface of the cylinder lens above and below the effective range, and a recessed portion of height dy into which the protruding portion of height Dy is fitted is provided on the mounting member side between them, as in the previous implementation. Similar to the example.

Therefore, in this embodiment, the catch 5 only holds the cylinder lens from above and below and restricts the vertical inclination with the hook portion at the tip, but does not position the cylinder lens in the generatrix direction.

Positioning in the generatrix direction is performed by holding both sides of the mounting member 4 between positioning members 7 on both sides that protrude toward the mounting member 4 side. Positioning in the vertical direction is the same as in the previous embodiment.

In the embodiment shown in FIG. 7, the mounting member 4 is made of a regular material such as aluminum die-casting, and the cylinder lens 1
After the plate spring 10 is fitted into the member, the plate spring 10 is attached to the mounting member 4 with screws 11, and the cylinder lens is fixed by pressing the outside of the effective range. In this case, positioning portions 7 are provided on both sides of the cylinder lens 1 in the generatrix direction, and protrude toward the mounting member 4 at an interval of dx.
positioning in the generatrix direction by sandwiching the cylinder from both sides, and positioning in the vertical direction by providing the mounting member 4 with a recessed part 12 having a height of D7 in the generatrix direction into which the cylinder lens 1 having a height of d7 fits. It can be easily positioned and fixed.

In the embodiment shown in FIG. 8, the positioning part 7 in the generatrix direction protrudes from the convex side of the lens, and is made to match the width dX between the width Dxt of the presser spring 1° and the inner surface 7a of the positioning part 7. This is for positioning. Positioning in the vertical direction is similar to the example shown in FIG.

Effects As described above, according to the present invention, by integrally providing the positioning portion to the cylinder lens, the shape of the mounting member can be simplified, and the assembly cost and parts cost can be reduced. By making the outside of the effective range of the lens protrude from the lens surface, it is possible to reduce the adhesion of tentacles and dust to the lens effective range surface.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view including a center line cross section showing its assembled state, and FIG. 3 is a schematic diagram illustrating the effective range and positional relationship of the cylinder lens.
' Fig. 4 is a front perspective view showing the shape of a cylinder lens of another embodiment, Fig. 5 is a rear perspective view thereof, Fig. 6 is a perspective view showing the shape of its mounting member, and Figs. 7 and 8. FIG. 3 is an exploded perspective view showing other embodiments. 1... Cylinder lens, 4... Mounting member 5...
・Catch 7...Positioning part 7a...Positioning surface A...Effective range Fig. 7 Fig. 8

Claims (1)

[Claims] having a positioning surface orthogonal to at least one of the generatrix direction of the cylinder lens and a direction perpendicular to the generatrix and the optical axis;
A cylinder lens characterized in that a positioning portion protruding from a lens surface in an effective range of the cylinder lens in the optical axis direction of the cylinder lens is provided by molding integrally with the cylinder lens outside the effective range of the cylinder lens. .