JPH04125506A - Assembling method for lens - Google Patents

Abstract

PURPOSE:To maintain a precise surface interval between two lenses and center them when a ring for interval formation can not be interposed between the two lenses by making the two lens surfaces abut on each other and centering them, and then adjusting the lens interval. CONSTITUTION:When the 1st lens 1 and 2nd lens 2 are centered and assembled, the 1st lens 1 and 2nd lens 2 are centered by bell clamp members 3 - 6 and the surfaces of the 1st lens 1 and 2nd lens 2 which do not face each other are sucked and held by the bell clamp members 3 and 5. Then the opposite surfaces of the 1st lens 1 and 2nd lens 2 are made to abut one each other and the 1st lens 1 and 2nd lens 2 are centered; and then both the lenses are sucked and held again and moved for specific interval formation and a lens cell 7 is adhered and fixed to the outer peripheries of both the lenses. Consequently, the lenses can precisely be centered regardless of whether the interval between the two lenses 1 and 2 is large or small.

Description

[Detailed description of the invention] [Industrial application field] The present invention has two It is something.

[Conventional technology] Conventionally, in order to bring out the optical axis of the lens, the lens is pressed between two holders, and the optical axis of the lens is aligned with the rotation axis of the holder. So-called bell-clamp means for carrying out this procedure were known prior to the filing of the application.

When assembling two lenses using the bell clamp means, there are cases where the two lenses are in contact with each other, or there is a sufficient gap between the two lenses, and a gap forming ring can be inserted into this gap. In some cases, it is possible to bring out the optical axes of the two lenses.

However, if there is a gap between two lenses, and the gap is not large enough to insert the gap-forming ring, it is difficult to maintain and center the surface spacing determined by the lens surface or the gap-forming ring. This made it impossible to assemble multiple lenses accurately.

[Problem to be solved by the invention]

An object of the present invention is to provide a means for assembling a lens system that enables accurate lens surface spacing and centering when a spacing forming ring cannot be inserted into the spacing between two lenses. That is.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for aligning and assembling the first lens and the second lens. The opposing sides of the first lens and the second lens are aligned by respective bell clamp members, and the opposing sides of the first lens and the second lens are held by suction by the bell clamp members. The surfaces of the first lens and the second lens are brought into contact with each other, and the centering between the first lens and the second lens is performed. After the centering is completed, each lens is held by suction again and moved to form a predetermined distance. After that, both lenses are The lens cell is fixed by adhering it to the outer periphery of the lens.

Further, in the present invention, when centering and assembling the first lens and the second lens, the first lens and the second lens are centered by bell clamp members, respectively, and the first lens and the second lens are centered. The non-opposed surfaces of the second lens are held by suction by a bell clamp member, and a gauge is inserted between the opposing surfaces of the first lens and the second lens,
Centering is performed between the first lens and the second lens, and after the centering is completed, each lens is held by suction again and moved to form a predetermined distance, and then a lens cell is placed around the outer periphery of both lenses. It is characterized by being fixed by adhesive.

[Function] With the configuration of the present invention, it is possible to accurately center the lenses regardless of the size of the distance between the two lenses.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

When assembling one lens, that is, a first lens 1 and a second lens 2 with a predetermined interval, when both lenses are brought into contact and centered, each process order (a) is shown in Fig. 1. This will be explained in ~(e).

First, the process of centering the first lens 1 ((a) in Figure 1)
, one surface 1a of the first lens 1 is placed on the flange portion 3a of the bell clamp member 3, the other surface 1b is brought into contact with the flange portion 4a of the bell clamp member 4, and both surfaces of the first lens l are placed. The bell clamp members 3 and 4 are brought into close contact with each other completely, and the optical axis of the lens is aligned with the rotation axis of the bell clamp member to perform centering.

When the centering of the first lens 1 is completed, the first lens l is fixed to the flange part 3a of the bell clamp member 3 by vacuum suctioning the end of the bell clamp member 3, and the first lens l is fixed to the flange part 3a of the bell clamp member 3. Remove the bell clamp member 4 on the side lb.

The process of centering the second lens 2 ((b) in FIG. 1) is similar to the process of centering the first lens l described above, in which bell clamp members 5 are attached to both surfaces 2a and 2b of the second lens 2. , 6 are brought into close contact with each other for centering.

Next, first lens 1. For the centering process of the second lens 2, the bell clamp member 5 that has been centered is placed on the surface lb of the first lens 1 fixed to the flange portion 3a of the bell clamp member 3 that has been centered. The surface 2b of the second lens 2 fixed to the flange portion 5a is brought into close contact ((C
)), first lens 1. The suction of the bell clamp members 3 and 5 that vacuum-suction the second lens 2 is released.

Then, with the first lens 1 and the second lens 2 in close contact with each other, due to the action of the bell clamp members 3 and 5,
First lens 1. The second lens 2 is centered.

First lens 1. After centering the second lens 2, the first lens 1. The second lens 2 is attached to the bell clamp members 3 and 5.
The first lens 1. is fixed by vacuum suction. The upper bell clamp member 5 is moved as shown in (d3) in FIG. 1 so as to form a predetermined lens interval between the second lenses 2.

The first lens 1. With a predetermined distance provided between the second lenses 2, a lens self is placed on the outer periphery of both lenses, and UV adhesive 8 is discharged between both lenses 1, 2 and the lens self, and UV irradiation is performed. The first lens 1. The second lens 2 is fixed, and the lens assembly process (FIG. 1(e)) is completed.

FIG. 2 shows that during the above-mentioned process, as in (C) of FIG.
The assembly process is shown in a case where centering cannot be performed when the first lens 1 and the second lens 2 are brought into close contact with each other.

In FIG. 2, the centering of the first lens 1 in (a), (
The centering of the second lens 2 in b) is performed in step (a) in the process of FIG.
), same as (b).

If it is not possible to center the first lens 1 and the second lens 2 in close contact with each other, as shown in FIG.
, 2, a gauge 9 having rigidity and dimensional accuracy is inserted to center the first lens 1 and the second lens 2.

After centering with the gauge 9 is completed, remove the gauge 8 so that the first lens 1 and the second lens 2 are at a predetermined distance, and align the optical axis of the second lens 2 with respect to the first lens 1. ((d) in FIG. 2), and then move both lenses 1, 2 through the lens cell 6 as in (e) in FIG.
to be fixed.

In the present invention, since two lenses are assembled with the above configuration, each lens is equipped with a vacuum suction means, and centering is performed accurately by a bell clamp member with high movement accuracy in the optical axis direction. By moving the lenses according to the distance between the two lenses, highly accurate assembly is possible regardless of the size of the distance between the two lenses.

[Effects] According to the configuration of the present invention, the distance between the two lenses is adjusted after the two lenses are centered by contacting the lens surfaces or by contacting a gauge between the lens surfaces, so that the distance between the two lenses is adjusted. Even when the spacing is extremely small, assembly can be performed with great precision.

[Brief explanation of drawings]

FIGS. 1(a) to (e) are schematic illustrations showing the steps of the first embodiment of the present invention, and FIGS. 2(a) to (e) are schematic illustrations showing the steps of the second embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1...First lens, 2...Second lens, 6...Bell clamp member, 7...Lens cell,...Adhesive, 9...Gauge.

Claims (2)

[Claims] (1) When centering and assembling the first lens and the second lens, center the first lens and the second lens using bell clamp members, and then align the first lens and the second lens. The opposite surfaces of the lenses are held by a bell clamp member, and the opposite surfaces of the first lens and the second lens are brought into contact with each other, so that there is a space between the first lens and the second lens. After the centering is completed, each lens is held by suction again and moved to form a predetermined distance, and then lens cells are bonded and fixed to the outer periphery of both lenses. How to attach. (2) When centering and assembling the first lens and the second lens, center the first lens and the second lens using bell clamp members, and then align the first lens and the second lens. The non-opposed surfaces of the lenses are held by suction with a bell clamp member, and a gauge is inserted between the opposing surfaces of the first lens and the second lens. The centering between the lenses is performed, and after the centering is completed, each lens is sucked and held again and moved to form a predetermined distance, and then the lens cells are glued and fixed to the outer periphery of both lenses. How to assemble the lens.