JP2685866B2 - Imaging element - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming element used in a copying machine, a facsimile machine or the like.

2. Description of the Related Art Conventionally, in copying machines, facsimiles, etc., as shown in FIG. 6, a lens array 4 and a roof mirror in which an optical path changing mirror 2 and a plurality of lenses 3 are integrally formed in a row in a housing 1 as shown in FIG. The array 5 is housed, and the diaphragm plate 6 is provided between the lens array 4 and the roof mirror array 5.
The imaging element provided with is used.

Here, the lens array 4 and the roof mirror array 5 are mounted in the housing 1 by forming the positioning insertion holes 7 and 8 in the diaphragm plate 6 formed integrally with the housing 1 to form the lens array 4. This is done by inserting the projection 9 into the insertion hole 7 and the projection 10 formed on the roof mirror array 5 into the insertion hole 8.

Problems to be Solved by the Invention The lens array 4 is formed by molding a plastics from the viewpoints of product stability and cost reduction. However, each lens at the time of molding or mounting in the housing 1 Due to the eccentricity of the curved surface of 3, the image is distorted and the image point is deviated from the conjugate point.

In order to eliminate such adverse effects, a pair of lens arrays 4 are created under the same conditions, and these lens arrays 4 are
It is conceivable that the lens is symmetrically arranged with the axis along the arrangement direction of the lenses 3 as the rotational symmetry axis. However, when the pair of lens arrays 4 created under the same conditions are symmetrically arranged, it is difficult to symmetrically arrange the pair of lens arrays 4 in the conventional configuration in which the projection 9 is formed on each lens array 4.

Means for Solving the Problems An optical path changing mirror is provided which reflects a light beam from an object plane toward a roof mirror array and reflects a light beam reflected and returned twice in the roof mirror array toward an image plane. A pair of lens arrays created under the same conditions between the optical path changing mirror and the roof mirror array are symmetrically arranged with an axis parallel to the array direction as a rotational symmetry axis, and a light flux is provided between the lens array and the roof mirror. A diaphragm plate for squeezing is arranged in parallel with the lens array, through holes parallel to the optical axis are formed in the lens array, and projections inserted into these through holes are formed in the diaphragm plate.

Further, there is provided an optical path changing mirror for reflecting a light beam from the object plane toward the roof mirror array and reflecting a light beam reflected and returned by the roof mirror array twice toward the image plane, the optical path changing mirror and the optical path changing mirror. A pair of lens arrays created under the same conditions with the roof mirror array are symmetrically arranged with an axis parallel to the array direction as a rotational symmetry axis, and a diaphragm plate for narrowing a light beam is provided between the lens array and the roof mirror. Arranged in parallel with the lens array, a through hole parallel to the optical axis is formed in the lens array and the diaphragm plate, an insertion hole parallel to the optical axis is formed in the roof mirror array, and the through hole is penetrated. In addition, a pin to be inserted into the insertion hole is provided.

Function By inserting the projection formed on the diaphragm plate into the through hole formed in the pair of lens arrays and parallel to the optical axis, the symmetrical arrangement of the pair of lens arrays can be easily performed with high accuracy.

In addition, by inserting a pin into a through hole formed in the pair of lens arrays and the diaphragm plate in parallel with the optical axis and inserting the pin into an insertion hole formed in the roof mirror array in parallel with the optical axis, The symmetrical position of the lens array is easily and accurately performed, and the lens array, the diaphragm plate, and the roof mirror array are accurately positioned.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. First, the housing body 11 and the front cover
A housing 14 composed of 12 and a rear cover 13 is provided, and a light entrance hole 16 facing the object surface 15 and a light exit hole 18 facing the image surface 17 are formed in the housing 14. An optical path changing mirror 19 is provided in the housing 14 on the side of the front cover 12, and a plurality of roof-shaped reflecting projections (not shown) are arranged in a row to face the optical path changing mirror 19. The roof mirror array 20 arranged on the rear cover 13 is provided on the rear cover 13 side.

Next, between the optical path changing mirror 19 and the roof mirror array 20, a pair of lens arrays 22 and 23 in which a plurality of lenses 21 are integrally formed in one row with equal pitch, and the lens arrays 22 and 23 are parallel to each other. Lens array 22,23
There is provided a diaphragm plate 24 for preventing crosstalk of light between the adjacent lenses 21 by narrowing the light flux passing through. The lens arrays 22 and 23 are formed under the same conditions using the same mold and mother die, and are symmetrically arranged with the axis parallel to the array direction as the axis of rotational symmetry.

A pair of upper and lower circular through holes 25 are formed substantially parallel to the optical axis at substantially the center of the lens arrays 22 and 23 in the array direction, and a pair of upper and lower circular arrays are formed at both ends of the lens arrays 22 and 23 in the array direction. A long hole-shaped through hole 26 is formed parallel to the optical axis. On one side of the diaphragm plate 24 facing the lens arrays 22, 23, a protrusion 27 facing the through holes 25, 26 and parallel to the optical axis is formed.
On the other hand, a pair of upper and lower insertion holes 28 are formed in a substantially central portion in the longitudinal direction on the other side of the diaphragm plate 24 facing the roof mirror 20, and the roof mirror array 20 has the insertion holes 28.
A pair of upper and lower protrusions 29 to be inserted into the upper part are formed.

In such a configuration, the diaphragm plate into the housing 14
The attachment of 24 is performed by inserting the projection 29 formed in the roof mirror array 20 into the insertion hole 28 of the diaphragm plate 24.

Next, for mounting the lens arrays 22 and 23 in the housing 14, the projections 27 integrally formed on the diaphragm plate 24 are inserted into the through holes 25 and 26 of the pair of symmetrically arranged lens arrays 22 and 23. By doing. Therefore, the pair of lens arrays 22 and 23 in the housing 14 can be symmetrically arranged easily and with high accuracy. Therefore, the light flux from the object plane 15 reflected by the optical path changing mirror 19 toward the roof mirror array 20 and the light flux reflected by the roof mirror array 20 and then directed toward the optical path changing mirror 19 are symmetrically arranged with high accuracy. Therefore, even if the curved surface of each lens 21 in the lens arrays 22 and 23 is decentered, the decentering is canceled and the eccentricity from the conjugate point of the image points on the image plane 17 is reduced. Misalignment and image distortion on the image plane 17 are prevented.

Next, a modified example of this embodiment will be described with reference to FIG. The same parts as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted (the same applies hereinafter). A projection 27 to be inserted into the through holes 25, 26 is formed on one side of the diaphragm plate 24 facing the lens arrays 22, 23, and the other side of the diaphragm plate 24 facing the roof mirror array 20 is substantially centered in the longitudinal direction. A pair of upper and lower protrusions 30 is formed in the portion, and an insertion hole 31 into which the protrusion 30 is inserted is formed in the roof mirror array 20.

In such a configuration, the projection 30 is inserted into the insertion hole 31, and the projection 27 is inserted into the through holes 25 and 26, whereby the diaphragm plate 24 and the lens array in the housing 14 are inserted.
Install 22,23.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIGS. 4 and 5. A pair of upper and lower circular through holes 26 is formed in the lens arrays 22 and 23 at a substantially central portion in the array direction.
Are formed parallel to the optical axis, and a pair of upper and lower through-holes 26 in the shape of elongated holes are formed parallel to the optical axis at both ends of the lens arrays 22 and 23 in the array direction. Further, a pair of upper and lower circular through holes 33 are formed in the diaphragm plate 32 at substantially the center and both ends in the longitudinal direction in parallel with the optical axis. Further, on one side of the roof mirror array 20 facing the diaphragm plate 32, a pair of upper and lower circular insertion holes located at a substantially central portion along the array direction of the roof mirror array 20.
34 and a pair of upper and lower elongated hole-shaped insertion holes 35 located at both ends in the array direction are formed parallel to the optical axis.
A plurality of pins 36 are inserted into the through holes 26 of the lens arrays 22 and 23 and the through holes 33 of the diaphragm plate 32 and the insertion holes 34 and 35 of the roof mirror array 20.
Is provided.

In such a configuration, when mounting the lens arrays 22 and 23, the diaphragm plate 32, and the roof mirror array 20 in the housing 14, first, the pins 36 are inserted into the through holes 25 and 33 facing each other and the pins thereof are inserted. By inserting 36 into the insertion hole 34, and inserting the pin 36 into the through holes 26 and 33 facing each other and inserting the pin 36 into the insertion hole 35, the lens arrays 22 and 23, the diaphragm plate 32, and the roof mirror. Array 2
0 and are integrally connected. Then, the lens arrays 22 and 23, the diaphragm plate 32, and the roof mirror array 20 which are integrally connected are mounted in the housing 14. Here, the through holes 25 and 26 formed in the pair of symmetrically arranged lens arrays 22 and 23.
Since the pins 36 are inserted into the lens array to position the lens arrays 22 and 23, the lens arrays 22 and 23 can be symmetrically arranged easily and with high accuracy. Further, these pins 36 are inserted into the through holes 33 formed in the diaphragm plate 32, and the roof mirror array
By inserting into the insertion holes 34 and 35 formed in the 20, the lens arrays 22 and 23, the diaphragm plate 32, and the roof mirror array 20 can be positioned with high accuracy. Further, by using the pin 36 as an independent member, the strength and the processing accuracy can be improved, and the lens arrays 22, 23, the diaphragm plate 32, and the roof mirror array 20 can be positioned with higher accuracy. .

In addition, in the embodiment of the invention described in claim 1 and the embodiment of the invention described in claim 2, the through holes 25, 26, 33 and the insertion holes 34, 35 are formed in a circular shape or an elongated hole shape, respectively. It may be a rectangular shape.

Advantageous Effects of Invention The present invention forms a pair of lens arrays under the same conditions as described above and forms through holes parallel to the optical axis in these lens arrays, and the projections formed on the diaphragm plate are formed in these through holes. By inserting the pair of lens arrays, the symmetrical arrangement in which the pair of lens arrays are arranged with the axis parallel to the array direction as the rotational symmetry axis can be easily performed with high accuracy. It is possible to prevent the deviation of the image point obtained by the image element from the conjugate point and the distortion of the image, and further to form a through hole parallel to the optical axis in the pair of lens arrays and the diaphragm plate and to form the roof mirror array. By forming an insertion hole parallel to the optical axis and inserting the pin inserted into the through hole into the insertion hole, the symmetrical arrangement of the pair of lens arrays can be easily performed with high accuracy, and the pair of lenses can be arranged. This has the effect that the mutual positioning of the array, diaphragm plate and roof mirror array can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the invention described in claim 1, FIG. 2 is an exploded perspective view showing a lens array, an aperture plate and a roof mirror array, and FIG. 3 is a modification of the embodiment. FIG. 4 is a vertical front view showing an embodiment of the invention described in claim 2, FIG. 5 is an exploded perspective view showing a lens array, an aperture plate and a roof mirror array, and FIG. It is a vertical front view which shows a prior art example. 15 …… Object plane, 17 …… Image plane, 19 …… Optical path changing mirror, 20
…… Roof mirror array, 22,23 …… Lens array, 24
...... Throttle plate, 25,26 ...... Through hole, 27 ...... Projection, 32 ...... Throttle plate, 33 ...... Through hole, 34,35 ...... Insertion hole, 36 ...... Pin

Claims (2)

(57) [Claims] 1. An optical path changing mirror for reflecting a light beam from an object plane toward a roof mirror array and reflecting a light beam reflected and returned twice in the roof mirror array toward an image plane, wherein the optical path is changed. A pair of lens arrays created under the same conditions between the mirror and the roof mirror array are symmetrically arranged with an axis parallel to the array direction as a rotational symmetry axis, and a light flux is narrowed between the lens array and the roof mirror. A diaphragm plate is arranged parallel to the lens array, through holes parallel to the optical axis are formed in the lens array, and projections to be inserted into these through holes are formed in the diaphragm plate. Child. 2. An optical path changing mirror is provided, which reflects a light beam from an object plane toward a roof mirror array and reflects a light beam reflected and returned twice in the roof mirror array toward an image plane. A pair of lens arrays created under the same conditions between the mirror and the roof mirror array are symmetrically arranged with an axis parallel to the array direction as a rotational symmetry axis, and a light flux is narrowed between the lens array and the roof mirror. A diaphragm plate is arranged in parallel with the lens array, a through hole parallel to the optical axis is formed in the lens array and the diaphragm plate, and an insertion hole parallel to the optical axis is formed in the roof mirror array, and the through hole is formed. An image forming element, comprising a pin which penetrates through the hole and is inserted into the insertion hole.