JP3140808B2 - 1x imaging element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit-size imaging device,
For example, the present invention relates to a unit-magnification imaging element including a roof mirror lens array used for a copying machine, a facsimile, and the like.

[0002]

2. Description of the Related Art Conventionally, an image forming element used at the same magnification in an optical system of a copying machine or the like includes, in addition to an existing refractive index distribution type rod lens array, a plastic roof mirror lens having the same performance as this. There is an array (hereinafter referred to as RMLA). FIG. 5 is a side view of a conventional roof mirror lens array. As shown in FIG. 5, a lens array (hereinafter, referred to as LA) 1, an aperture plate 2, and a roof mirror array (hereinafter, referred to as RMA) are arranged and integrated from above to constitute an RMLA4. And the conventional molded product,
As can be seen from the drawing, draft angles for die cutting are formed on both left and right side surfaces of the LA1, the aperture plate 2, and the RMA 3, respectively, thereby facilitating die cutting after the forming process.

The aperture plate 2 has a function of blocking a light beam passing through each lens between adjacent lenses. Then, an erect real image is formed along the optical axis direction in which the LA1 and the RMA3 are arranged and the direction orthogonal to the optical axis.
In particular, a required size can be obtained by overlapping a plurality of images obtained by a single LA1 and RMA3 in the optical axis direction. The LA1 and the RMA3 are integrally formed of plastic, respectively, and are fixed together with the diaphragm plate 2 in the housing so as to maintain a mutual positional relationship.

Japanese Patent Application Laid-Open Nos. Sho 63-49860, 1-139518, 1-291121, 1-2970009 and 2-161401 disclose such an equal-magnification imaging element. Some are described in the gazette.

[0005]

However, in the above-mentioned conventional unit-magnification imaging device, LA1, aperture plate 2 and R
When molding a long plastic object using a three-point part of MA3, bending is likely to occur in the longitudinal direction of the molded article,
It has been difficult to completely eliminate bending even when performing high-precision molding.

Therefore, when the RMLA 4 is incorporated in the housing, if the RMLA 14 is stabilized by abutting the side surface of the RMLA 14 against the housing, the LA1, the diaphragm plate 2 and the RMA
There is a problem that the draft formed on both sides of line 3 causes line contact with the housing, which causes the molded product to be tilted or rattled. In addition, burrs are easily generated at the rib boundary portion of the LA surface or the RMA mirror surface in the direction of the optical axis, so that there is a problem that the molded product is tilted or loose.

[0007] As described above, the same magnification using the conventional RMLA is used.
In the image forming element, the R
There is a problem in that the optical characteristics are degraded because the MLA tilt or backlash causes displacement of the imaging point and bending of the scanning line. The present invention has been made in view of such a conventional problem, and corrects the inclination and backlash of the RMLA caused by bending or burrs of a molded product when molding RMLA, thereby displacing the position of an image point. It is an object of the present invention to provide an equal-magnification image-forming element capable of preventing bending of scanning lines and scanning lines and obtaining good optical characteristics.

[0008]

According to the first aspect of the present invention,
In a unit-size coupling element in which a roof mirror lens array in which a molded product of a roof mirror array, an aperture plate and a lens array is integrated is incorporated in a housing, the reference surface of the roof mirror lens array that abuts against the housing has an optical axis direction and light. The reference plane is provided in a direction perpendicular to the axis, the reference plane in the optical axis direction is formed in a portion other than the effective surface of the lens array, and the reference plane in the direction perpendicular to the optical axis is formed on the diaphragm plate. An equal-magnification coupling element , wherein a reference surface in the optical axis direction of a mirror lens array and a reference surface orthogonal to the optical axis direction are assembled by abutting on a housing.
You .

According to a second aspect of the present invention, the aperture plate has a draft for forming a die on a surface opposite to a reference surface in a direction orthogonal to the optical axis.

[0010]

According to the first aspect of the present invention, a portion excluding the effective surface of the LA, which is the optical axis direction of the RMLA,
A reference plane is provided on each of the diaphragm plates in the directions orthogonal to each other, and the reference planes in two directions formed on the RMLA are assembled by abutting the housing. For this reason, even if a bend or a burr occurs during the forming process of the RMLA, the reference surface provided on the RMLA is abutted against the housing to correct the inclination and the backlash, and the optical axis direction of the RMLA and the direction orthogonal to the optical axis are changed. It is always kept in the correct position and shows good optical properties.

According to the second aspect of the present invention, a gradient for die cutting is formed on the surface on the opposite side of the diaphragm plate on which the reference surface is formed. For this reason, the reference surface of the diaphragm plate prevents the molded product from being tilted or loose when the molded product is incorporated into the housing, and facilitates die-cutting when molding the diaphragm plate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 and 2 are views showing an embodiment of a unit-size imaging element according to the first aspect of the present invention. First, the configuration will be described.

FIG. 1 is a perspective view of a roof mirror lens array according to one embodiment. As shown in FIG.
The RMLA 14 is configured by arranging 11, the aperture plate 12 and the RMA 13 in the optical axis direction indicated by the arrow A, and integrating them. A characteristic configuration of the present embodiment is that an optical axis direction reference surface 15 and an orthogonal direction reference surface 16 with respect to the housing are provided in the optical axis direction (arrow A direction) of the RMLA 14 and in a direction perpendicular to the optical axis (arrow B direction). It is being done.

The optical axis direction reference surface 15 is accurately formed on a sand portion (rib portion) in the drawing facing the optical axis direction except for the effective surface 11a of the LA 11. In this case, the orthogonal direction reference surface 16 is a diaphragm plate 1 facing in a direction orthogonal to the optical axis.
2 is formed with high precision on the side surface (shown by a sand area in the figure). FIG. 2 shows an RMLA on which the reference surface shown in FIG. 1 is formed.
FIG. 14 is a cross-sectional view showing a state in which 14 is incorporated in a housing 17. As shown in FIG. 2, the planes indicated by “x” in the figure are the optical axis direction reference plane 15 and the orthogonal direction reference plane 16. Each reference surface 15 formed on these RMLAs 14,
The projections 16 can be pressed against the inner wall surface of the housing 17 to correct the bending, inclination, and play of the molded product. In order to maintain this abutting state, in this embodiment, the side leaf spring 18 and the lower leaf spring 19 are placed at positions opposite to the reference plane, respectively, in the RMLA1.
4 and the housing 17 are biased.

Next, the operation will be described. By adopting the above-described configuration, the RMLA 14 of the present embodiment can provide the optical axis direction reference surface formed on the RMLA 14 with respect to the housing 17 even if the RMLA 14 is bent in the longitudinal direction during molding or burrs are formed. 15 and the orthogonal reference surface 16 are assembled in a state where they abut against each other, so that the bending of the molded product and the inclination due to burrs can be corrected, and play can be prevented.
For this reason, the displacement of the image forming point of the RMLA 14 and the bending of the scanning line are eliminated, and a 1: 1 image forming element having good optical characteristics can be obtained.

In the above embodiment, the reference plane 1 in the optical axis direction is used.
5 is provided on the rib portion of the LA 11, but is not limited to this. Any portion other than the effective surface 11 a of the LA 11 facing the optical axis direction can be used as the reference surface. Next, FIG.
FIG. 4 to FIG. 4 are cross-sectional views showing an embodiment of the unit-size imaging device according to the second aspect of the present invention. As shown in FIG. 3, the characteristic configuration here is that the length of the diaphragm surface 12 on the reference surface side is longer than that of the other molded products (LA11, RMA13), and is orthogonal to the direction of arrow B on the side surface. A direction reference surface 16 is formed, and a draft surface 20 for die cutting is formed on a surface opposite to the reference surface 16. For this reason, it is possible to easily remove the die after the forming process of the aperture plate 12, and to prevent the RMLA 14 from rattling or tilting since the reference surface of the aperture plate 12 is pressed against the housing 17 with the surface. And good optical characteristics can be obtained.

Further, as shown in FIG. 4, after the three-point molded parts 11, 12, and 13 on which the draft surface 20 is formed are integrated, the left side surface shown in FIG. The orthogonal direction reference plane 16 may be formed. In this case, a post-process of machining the reference surface is required after the molding process. However, since the mold can be easily removed after the molding process, and since the orthogonal reference surface 16 when incorporated into the housing is formed on the entire surface, Thus, it is possible to more reliably prevent the play and inclination of the molded product. As described above, in the present embodiment, the orthogonal direction reference surface 16 is not limited to the aperture plate 12, and other LA1
1 and RMA13.

[0018]

According to the first aspect of the present invention, RMLA
The reference surface formed of the diaphragm plate provided in the direction of the optical axis and the direction perpendicular to the direction of the optical axis is assembled into the housing by abutting the housing against the housing. Is corrected to prevent the displacement of the imaging point and the bending of the scanning line, and it is possible to always obtain stable and good optical characteristics.

According to the second aspect of the present invention, since a draft is formed on the side opposite to the reference plane in the direction perpendicular to the optical axis formed on the aperture plate, the molded product is mounted on the housing by the reference plane. The inclination and play of the RMLA at the time of assembling can be prevented, and the die after the forming of the aperture plate can be easily removed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of a unit-magnification imaging element according to the first aspect of the present invention.

FIG. 2 is a sectional view showing a state where the roof mirror lens array of FIG. 1 is incorporated in a housing.

FIG. 3 is a sectional view showing an embodiment of a unit-magnification imaging element according to the invention described in claim 2;

FIG. 4 is a sectional view showing another embodiment of the unity magnification imaging element according to the second aspect of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional roof mirror lens array.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinya Senoo 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-4-78815 (JP, A) JP-A Sho 58-44416 (JP, A) Fully open Showa 64-49813 (JP, U) Fully open Showa 62-63716 (JP, U) Fully open Showa 61-123946 (JP, U) Really open Showa 55-123946 (JP, U.S.A.) U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 27/18 G02B 3/00 G03B 27/50

Claims (2)

(57) [Claims] A roof mirror lens array in which a molded product of a roof mirror array, an aperture plate and a lens array is integrated is incorporated in a housing, and a reference surface of the roof mirror lens array abutting on the housing is provided. The reference plane in the optical axis direction and the direction perpendicular to the optical axis is provided in a portion other than the effective surface of the lens array, and the reference plane in the direction perpendicular to the optical axis is
A unity magnification coupling element formed on the aperture plate , wherein a reference surface in the optical axis direction of the roof mirror lens array and a reference surface orthogonal to the optical axis direction are abutted on a housing and incorporated. 2. An equal-magnification coupling element according to claim 1, wherein said aperture plate has a draft for forming a die on a surface opposite to a reference surface in a direction orthogonal to an optical axis.