JPS60100119A - Image forming optical device - Google Patents

Abstract

PURPOSE:To decrease the number of parts, and to reform a warp when forming a luminous flux diaphragm plate, etc. by forming the luminous flux diaphragm part of a housing body and a side wall part in one body. CONSTITUTION:An image forming optical device is constituted of a rectangular mirror 31, diaphragm mask 32, lens array 33, and a roof-mirror array 34, etc. in a case 30. The case 30 consists of a main body, upper and lower wall plates 37, 38, and front and rear covers 40, 41. The body is formed of plural luminous flux diaphragm parts 39b corresponding to each lens part 33a, and a side wall part extended and provided in the direction orthogonal to the diaphragm part 39b from both ends of the diaphragm part 39b in one body by resin. In the diaphragm part 39b, a fitting groove 39d being part to be fitted for reforming a warp is formed on the upper and lower end faces, respectively, and also a through-positioning hole is provided on two places in the center part, and one place each in both end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an imaging optical device used in electronic equipment such as a photocopier or a facsimile.

Electronic devices that use this type of imaging optical device include:
For example, a repeating machine as shown in FIG. 1 has been considered in the past.

This copying machine irradiates and reflects light from a light source 4 onto a document 3 that is fed in one direction by a feed roller 2 between a contact lens 1 and a glass 1'', and the reflected light is transmitted through an imaging optical device 5. The toner image is projected and exposed onto the photosensitive drum 7 uniformly charged to a predetermined polarity by the charging device 6, developed by the developing device 8, and then transferred to the transfer paper 9 by the transfer device 10. The remaining 1 henna after transfer is removed, and the electric charge is removed by the static eliminator 12, thus completing the full-body image cycle.

The imaging optical device 5 used in this copying machine is, for example, as shown in FIGS. 2 and 3. In other words, in this imaging device 5, a case 14 is molded of resin, and a light entrance hole 17 and a light exit hole 18 as light passing holes are formed in a mud wall portion 15 and a non-wall portion 16 of the case 14. A right angle mirror 19 (optical path converting mirror) is formed at the left end of the case 14 in FIG. 2, a lens array 20 is located approximately in the center, and a roof mirror array 2 is located at the right end of FIG.
1 is housed. This right-angle mirror 19 includes two adjacent reflective surfaces 19a orthogonal to each other, and these reflective surfaces 10a are formed by the light entrance hole 17 and the light exit hole 1, respectively.
8 each. Such a reflective surface 19a is
It is formed by vapor-depositing aluminum on two mutually adjacent and perpendicular faces of a synthetic resin pentagonal prism. Also.

In the lens array 20, a plurality of lens parts 20a are formed at a predetermined pitch in one direction on a long axis, and one roof mirror array 21
A plurality of roof-shaped reflective protrusions 21b are connected to the main body 21a, and aluminum metal is vapor-deposited on the reflective protrusions 21b to form a reflective surface 21.

In such an imaging optical device 5, the optical head (hole 17
The light incident on the case 14 is converted by the reflection surface 19a on the upper side of the right-angle mirror 19 to the lens array 20 side, passes through the lens section 20a of the lens array 20, and is reflected on the roof mirror array 21. After being reflected by the reflecting surface 21c and passing through the lens array 20 again from the opposite direction, the optical path is converted downward by the reflecting surface 19a on the lower side of the right-angle mirror 19, and the light is emitted from the light exit hole 18 of the case 14. I am made to do so. Therefore, if such an imaging optical device 5 is used, the optical path can be converted as described in 1111, so the optical path length in the vertical direction can be shortened, and the height of the copying machine can be lowered.

By the way, since the above-mentioned lens array 20 and roof mirror array 21 are each formed by integral molding of synthetic resin, internal stress or sink marks are likely to occur in them during molding, which causes deformation such as warping. .

However, in the conventional imaging optical device 5, although the lens array 20 and roof mirror array 21 are assembled in the case 14, there is no means to correct deformations such as warpage, and the assembly is completed with warpage. There was a fear that the image formation performance would deteriorate because of the vignetting. It is an object of the present invention to provide an imaging optical device that can correct warping during molding of an array, etc., and improves imaging performance.

""or The present invention will be explained below based on the drawings.

4 to 10 are diagrams showing an imaging optical device according to an embodiment of the present invention.

First, to explain the configuration, the imaging optical device of this embodiment includes a right angle mirror 31, an aperture mask 32, a lens array 33, and a roof mirror array; 14 housed in a case 30.

Specifically, the case 30 has a housing body 39 with an upper wall plate 37 and a lower wall plate 38.
Take the I8 cylindrical housing 36 at one end between the front and rear ends of the housing 3 (=JI-J).
It is composed of a η lid 40 and a rear lid 41. The housing body 39 is the main lens part 3 of the lens array 33.
; a long plate-shaped light flux diaphragm part 39b having a plurality of light flux diaphragm holes 19a corresponding to 1a; The side wall portion 39c is formed by molding one piece of resin. This light flux diaphragm part: 19b has
A fitting groove 39d, which is a fitting part for warp correction, is formed on the lower end surface and the lower end surface, respectively, and a fitting groove 39d is formed on the lower end surface, and a fitting groove 39d is formed on the lower end surface.
A positioning hole 39e is bored through each of the two ends, one at each end. Also, the side! A mounting surface 39f is formed at the upper end and the lower end of the +1 part 39c, and a screw hole 39g is formed in these mounting surfaces 39f. It has been set up.

The front end portion 3911 of the side wall portion 39c is formed in a shape that matches the inside of the front lid 40, and a fitting recess 39i into which the front lid 40 is fitted is formed in the substantially middle heat section in the downward direction. There is.

Furthermore, slightly behind this fli+ end 39b,
A notch 39, which has a V-shape when viewed from the side and engages with the right-angle mirror 31, is formed in the opposing inner wall portions of the side wall portions 39c.

On the other hand, the "two-wall plate 37" and the lower wall plate 38 are formed by extrusion molding of rigid aluminum with high conductivity, and have a cover glass removal hole for attaching the cover glass 35 to the front edge. J' tf1737a, 3+
1+ is a rear cover removal groove 37b for inserting the rear cover 4[1] on the rear edge.

38b is formed. In addition, between these cover glass mounting holes i1'\37 +1+ 38a and the rear cover mounting grooves 37b, there is a fitting part for the warpage correction part 1 which is fitted into the fitting groove 39d of the light flux diaphragm part 39b. A warpage correction rib 17 (Z, 38c) is formed at a predetermined position, and a positioning rib 37d for fixing the lens array 33 is provided on the front side of the warp correction rib 37c, :18c.
38d is formed on this positioning rib 37.
Flare prevention rib on the front side of d, 38d: 17(!, 38c
is formed.

--On the other hand, the front lid 40 is also formed into a long plate shape with the upper and lower ends bent by extrusion molding of the aluminum laminate 11, and the lower end edge and the lower end edge are provided with cover glass holes (=J grooves 40a). is formed, and a fitting protrusion 4 that is fitted into the fitting recess 3!Ii of the housing main body 39 is formed in the medium heat part.
0b is formed and 1t9:,,Furthermore, mirror presser Jl is attached to the dwarf moon 61 mating protrusion 40b, 40c is cut 1;1
I have an anus.

The rear lid 41 is formed of resin into a long plate shape, and the rear lid mounting parts 111, 37b and 38b of the second wall plate 37 and the tenth wall plate 38 are fitted on the one end surface and the lower end surface of the rear lid 41. A plurality of protrusions 41, a are provided in a protruding manner.

A case made of such members: (The right-angle mirror 31 housed in
1d and 31b are configured to be in contact with each other at right angles with a part of the base Z1 of the light-shielding paper 31c sandwiched between them. Both longitudinal ends of this light-shielding paper 31c are mirror plates 31a.

It is cut out so that it does not protrude from 31b. The aperture mask 32 is made of polyester film and is formed into a long plate shape.
A plurality of aperture holes 32a having the same pitch and the same size as the plurality of lens portions 33a of the lens array 33 are bored. Further, the lens array 33 has a plurality of lens parts 33a formed at a predetermined pitch as in the conventional case, and a plurality of positioning pins 33b fitted into the positioning holes 39e of the housing body 39 at both ends and the center part. It is installed protrudingly. Further, the roof mirror array 34 includes a roof mirror portion 34b having a reflective surface 34a with a uniform wall thickness at the peaks and valleys.
A frame portion 34c surrounding this dahamira portion 34b is integrally formed with I)MMA which is a synthetic resin,
This frame portion 34c has a positioning hole 3 of the housing body 39.
A positioning pin 34d that is fitted into the pin 9e is provided in a protruding manner.

Next, a method of assembling and operation of an imaging optical device made up of such components will be explained.

First, to explain how to assemble the lens array 33 in front of the light flux diaphragm part 39b of the housing body 39,
A roof mirror array 34 is attached to the rear side of each JL light flux diaphragm section 3.
Positioning pins 33b and 34 are inserted into the positioning holes 30e of 9b.
Fit and remove d. In addition, the lens array 33
The aperture mask 32 is attached to the front side of the lens by inserting the positioning pin 33b into the positioning hole 321). Next, the fitting groove 39 of the light flux diaphragm portion 39b of this housing body 39
At the same time, the warpage correction rib 38c of the lower wall plate 38 is fitted into the lower wall plate 38, and both ends of the lower wall plate 38
The side wall portion 39c of the side wall portion 39c can be accessed by a screw Δ or a contact layer on the surface 39f. Then, the rear cover mounting groove 3 of the lower wall plate 38
8b to engage the protrusion 41a on the lower surface side of the rear lid 41,
This rear cover 41 is disposed on the rear side of the roof mirror array 34. After that, attach the -tv and +7 to the housing body 39 in the same way as the lower wall plate 38.

Then, the lens array 33 is held between the light flux diaphragm 39b whose warp has been corrected and the positioning ribs 37d and 38d of the upper and lower wall plates 37 and 38, so that the warp is corrected and the lens array 33 is held between the light flux diaphragm 39b and the positioning ribs 37d and 38d of the upper and lower wall plates 37 and 38. ] Sign. Further, the roof mirror array 34 is held between the light flux diaphragm portion 39b and the rear lid 41, and warpage is also corrected.

After that, remove the cover glass from the front cover 4o] by inserting 2 into the groove 40a.
While fitting the front edges of the two cover glasses 35,
The right angle mirror 31 is supported by a mirror holding fitting 40c.

The fitting protrusion 40b of the front cover 4o is fitted into the fitting recess 39i of the housing body 39 as shown in FIG. At the same time, the rear edges of the two cover glasses 35 are attached to the cover glass handles (J' i
These cover glasses 35 are fitted between the front cover 40 and the upper and lower wall plates 37 and 38, respectively. In addition, the right-angle mirror 31 is in a state where both ends thereof are engaged with the notch 39j of the housing main body 39,
It is pushed in the direction of engagement by the mirror presser metal fitting 40c and is removed from the handle. The imaging optical device of this embodiment is assembled, for example, by the procedure described above, but it is of course possible to assemble it by other procedures.

Next, the operation when the imaging optical device assembled as described above is used in a conventional copying machine will be explained. The light emitted from the light source 4 and reflected by the original 3 passes through the cover glass 35 disposed above, hits the mirror plate 3]a of the right-angle mirror 31, and is reflected toward the lens array 33. After that, this reflected light is reflected by the anti-flare rib 3.
7e, 38e, aperture hole of aperture mask 32; 32a, lens section 33a of lens array 3:3, light flux aperture section 39b
The light beam passes through the light flux aperture 3!3a, hits the reflective surface 34a of the roof mirror array 39, and is reflected.

The light J3 on this roof mirror array 39 is reflected by one reflecting surface 34a, and then further reflected by the other reflecting surface 34a facing 14a, and the lens array 3
It is reflected to the 3rd side. After that, the light flux diaphragm section 39b
, the lens section 3 of the lens array 3:)
3a, aperture hole of aperture mask 32; 32a, mirror plate 3 of right angle mirror 31 via flare prevention ribs 37e, 38e;
11), is reflected downward, passes through the lower cover glass; 35, and is illuminated by the photosensitive drum 7.

In this case, the lens array 33, the roof mirror array 34
As described above, the warpage of the light flux diaphragm part 39b, etc. is corrected, and they are assembled with high accuracy, so that the image is not distorted, shifted or smeared, and the imaging performance is improved. .

In addition, the upper and lower wall plates 37, 38 and the front cover 40 are made of aluminum material with high thermal conductivity, and these upper and lower wall plates 37, 38 and the front cover 40 are made of resin parts that are prone to thermal deformation. Since the lens array 33 and the roof mirror array 34 are covered, even if local heating is performed by the light source 4, the upper and lower wall plates 37, 38 and the front cover 40 are heated uniformly, and the resin parts are not heated. will be reduced. Therefore, the upper and lower wall plates 37, 38, etc. expand almost uniformly and do not cause distortion, so there is no adverse effect on the lens array 33, roof mirror array 34, etc., and moreover, the resin parts themselves are protected from heat. There is no distortion, and the imaging performance is better than the initial performance i'
1 [Can hold.

Furthermore, since the housing main body 39 has a side wall portion 39c that constitutes a part of the case 30 and a light flux diaphragm portion 1flb having a light flux diaphragm hole 39a, which are integrally molded with resin, the housing body 39 has a part that corresponds to the light flux diaphragm portion 39b. There is no need to install a new one, and the number of parts can be reduced, leading to cost reductions. Incidentally, although not mentioned in the conventional example, some conventional imaging optical devices are provided with a diaphragm plate corresponding to the light flux diaphragm section 39b.

Furthermore, since the upper and lower wall plates 37 and 38 are formed by extrusion molding of aluminum, the rear cover mounting 53
7b, 3ab, warpage correction ribs 37c, :i8c, etc. can be freely formed without secondary processing.

Effects As described above, according to the present invention, the number of parts can be reduced by integrally molding the light flux diaphragm part and the side wall part of the housing body, and the sled of the molding 114 of the light flux diaphragm plate etc. can be reduced. This has the effect of improving imaging performance because it can correct the

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing conventional imaging optical devices.
Fig. 1 is an explanatory diagram showing a copying machine in which the same imaging optical device is used, Fig. 2 is a sectional view showing the same imaging optical device, and Fig. 3 shows the light of the same imaging optical device: ';? : An exploded perspective view showing parts; FIGS. 4 to 10 are views showing one embodiment of the imaging optical device of the present invention; FIG. 4 is a cross-sectional view of the same imaging optical device;
The figure is an exploded perspective view of the imaging optical device, FIG. 6 is a bottom view including a partial cross section of the imaging optical device, FIG. 7 is a plan view of the imaging optical device, and FIG. 8 is the imaging optical device. FIG. 9 is a partially cutaway rear view of the optical device, FIG. 9 is a partially cutaway front view of the same imaging optical device, and FIG. 10 is an explanatory diagram showing the state of the front cover and housing body. be. 30...case. 31.Right angle mirror (optical path conversion mirror), 33.. Lens array, 33a.. Lens section, 34.. Roof mirror array, 36.. Housing, 37.. Earthen wall board, 37e..
Warp correction rib (fitting part for warp correction), 38...Lower wall plate. 311e... Warp correction rib (fitting part for warp correction), 3
9...Housing body, 39a...Light flux aperture hole, 39
b... Light flux diaphragm part, 39c - Side wall part, 39d - Fitting groove (fitting part for warp correction), 40... Front lid, 41...
Rear lid. Figure 1 Figure 7 Square 65 4U Figure 8 Square Figure 9 d Figure 10

Claims (2)

[Claims] (1) The upper wall plate and the upper wall plate are attached to the housing body 4 =
A case is composed of a cylindrical housing formed by a cylindrical case, a front cover and a rear cover installed at the front and rear opening ends of the housing, and an optical path conversion mirror, a lens array, and This is a viscous IAt optical device configured by sequentially housing roof mirror arrays, and the housing body is disposed between the lens array and the roof mirror array, and the housing main body is arranged between each lens part of the roof mirror array and the roof mirror array. a beam diaphragm having a corresponding number of beam diaphragm holes and a fitting portion for warp correction provided on its lower surface;
Side walls extending from both ends of the light flux diaphragm in a direction perpendicular to the light flux diaphragm are integrally molded with resin. 2. An imaging optical device characterized in that a warp correction fitting part is formed to be fitted with a warp correction fitting part of the light flux diaphragm part of the housing main body. (2) The imaging optical device according to claim 1, wherein the front cover, upper wall plate, and lower wall of the case are each made of a material with high thermal conductivity. 3) The imaging optical device according to claim 2, wherein the front cover, earthen wall plate, and tenth wall plate of the case are formed by extrusion molding of aluminum.