JPS5844416A - Optical image forming device - Google Patents

Abstract

PURPOSE:To incorporate a lens array in a housing without adjustment even if the array is curved, by providing the housing with positioning guide grooves for the lens array and a Dach-mirror array. CONSTITUTION:A housing 6' is provided with a positioning guide groove 10 for a lens array 1' and a positioning guide groove 11 for a Dach-mirror array 3'. Then, the lens array 1' and Dach-mirror array 3' are only inserted externally into those guide grooves 10 and 11 to position both accurately, and curvature is corrected by the guide grooves naturally. In the figure, 12 is light shielding holes for flare light prevention.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an imaging optical device, in particular, an optical path converting mirror is arranged in front of a lens array, a roof mirror array is arranged behind the lens array, and these are held by a housing. Regarding the type of imaging device used.

In this type of imaging device, components such as lens arrays and roof mirror arrays.

Usually, it is formed by integral molding of plastic - due to the "sink" etc. peculiar to this processing method.

Warpage often occurs in these long components.

In particular, if the roof mirror array is warped, the perpendicularity of the opposing reflective surfaces of each roof mirror will change, so this will not have a very negative effect on the optical characteristics. For this reason, 1. Normally, the warpage is corrected when these components are attached to the nozzle, but this correction is actually quite difficult, especially in the case of a roof mirror array. If you press down on a part of the array, the angle of the reflective surface in that part will often be different from that in other parts.

extremely difficult.

An object of the present invention is to provide an imaging optical device that can be assembled into a housing without any adjustment to obtain necessary optical characteristics even if the lens array or roof mirror array is warped. It is in.

An object of the present invention is to provide a housing with a positioning guide groove for at least a lens array and a roof mirror array, and to insert the lens array and roof mirror array into this groove from the outside.

This is accomplished by assembling it into a compact housing.

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows an imaging optical system to which the present invention is applied. This optical system consists of a lens array 1 in which a plurality of lenses are consecutively arranged in a straight line, an optical path converting mirror 2 arranged in front of the lens array 1, and a long right-angle mirror 2, for example, a long right-angle mirror 2. It includes a roof mirror array 3 in which a plurality of roof mirrors arranged at the rear are continuously arranged in a straight line. The lens array 1 and the roof mirror array 3 are arranged such that the arrangement pitch of each lens is equal to the arrangement pitch of each roof mirror, and the ridgeline of the valley of each roof mirror is located at the center of each lens. At this time, the light beam from the object 4 is reflected by one reflecting surface of the right-angle mirror 2, passes through the lens 1, is reflected by the Tarham mirror 3, and passes through the lens 1 again.

It is reflected by the other reflective surface of the right-angle mirror 2 and is imaged as an erect real image 5. Therefore, there is the advantage that the optical path length is much shorter than in conventional optical systems using spherical lenses, and a compact imaging device can be obtained.

Such an optical system is held and unitized by a housing 6 having openings above and below the right-angle mirror 2 for inputting and outputting light, as shown in FIG. The lens array 1 and the roof mirror array 3 are first held at their upper and lower sides by positioning holding plates 7.8, and then assembled into the housing 6. The roof mirror array 3 is pressed at its rear by a presser plate 9 to correct its warpage, or as mentioned above, it is difficult to correct it properly and distortion occurs due to partial suppression. The perpendicularity and flatness of the surface may be distorted.

In contrast, in the present invention, as shown in Figure 4, the housing 6' is provided with a positioning guide groove 10 for the lens array 1' and a positioning guide groove 11 for the Dano mirror array 3'. , Sohazowa guide groove 10°11
In addition, by simply inserting the lens array 1' and the roof mirror array 3' from the outside, both can be correctly positioned, and the warpage can be easily corrected by the guide grooves. In this embodiment, each guide groove 10.11 is provided through the nozzle 6' in a direction perpendicular to the longitudinal direction of the lens array 1' and the Dono mirror array 3'; In the embodiment shown in Fig. 5, the guide groove 1
0' and 11' are provided through the housing 6'' in a direction parallel to the longitudinal direction of each array 1'', 3''.

In one embodiment, the lens 7 of the nozzle 6', 6''
Both portions of the ray are open to allow light to pass from and to the right-angle mirrors disposed on 11 sides thereof, and grooves 10.10' for lens arrays and grooves 11.11' for roof mirror arrays. There is a light shielding hole 12.1 for each lens and each roof mirror in the part of the housing between the
These light-shielding holes 12 and 12' are for preventing flare light, but this part of the housing is left open in the same way as the front part, and there are holes for this purpose inside. Another light-shielding cylinder, light-shielding plate, etc. may be arranged.

What is the lens array, roof mirror array, and each guide groove?
It is preferable to make the dimensional difference as small as possible so that the lens array and the roof mirror array can be inserted into the guide grooves and their warpage can be corrected. The material that forms the housing.

Lightweight and lens arrays and roofs made of aluminum, aluminum alloy, etc. Any material may be used as long as it has sufficient strength to correct warping of the mirror array. The materials used to form the lens array include thermoplastic resins such as acrylic resin and polycarbonate resin, and thermosetting resins such as diethylene glycol bisallyl carbonate polymer known as CR-39 manufactured by PPG. In addition to the above-mentioned resins, materials for forming the roof mirror array include styrene resin and ABS resin.

Thermoplastic resins such as AS resin and thermosetting resins such as epoxy 81@ are used. The stiff lens array and the roof mirror array are formed by a processing method such as an injection molding method, a compression molding method, an injection molding method, or a casting method. Dano mirror arrays are prone to warping during processing and distortion during assembly due to their unique shape, so we have developed various shapes to minimize these problems, such as making the wall thickness approximately the same throughout. In some cases, a reinforcing frame is provided so as to span the ridgeline of the valley of each Dano mirror, or both sides are made symmetrical with respect to a reinforcing frame provided in a band shape around the outer periphery of the center. , in such a case.

It goes without saying that the grooves that guide these roof mirror arrays should also be shaped to accommodate the warp.

In addition, the right-angle mirror placed in front of the lens array also
Like the lens array and roof mirror array, it may be inserted into the housing. In addition, the present invention can be modified in various ways within the scope of the spirit of the invention as set forth in the claims.

[Brief explanation of the drawing]

Figure 1 is a perspective view schematically showing the optical system to which the present invention is applied, Figures J and 2 are imaging ray diagrams of the optical system shown in Figures 2 and 1, and Figure 3 is the optical system shown in Figure 11. FIG. 4 is a partial perspective view showing an example of the imaging device according to the present invention. Figure 5 is a partial perspective view showing another example of the imaging device according to the present invention.

Claims (1)

[Claims] 1. An optical path converting mirror is arranged in front of the lens array.
- an imaging optical device in which a Dunno mirror array is arranged behind the lens array, and these are held by a no-waging, in which the . . . An imaging optical device characterized in that a positioning guide groove is provided, and the lens array and the roof mirror array are inserted into the guide groove from the outside to assemble the lenses into the housing. 2. The apparatus according to claim 11, wherein a guide groove for the lens array of the housing is provided with a light-shielding hole for each lens and a light-shielding hole for the lens array. .