JPH04325447A - Method for bonding optical parts - Google Patents

Abstract

PURPOSE:To prevent the damage to the surface of a lens 3 or its surface treatment even when the lens 3 is miniaturized to meet the miniaturization of the lens 3 and to save the effort to clean a jig for pressing the lens 3 on a step 1a. CONSTITUTION:A pressure difference is maintained between the inside and outside of the small-diameter part 2b of the through-hole 2 of a barrel 1 until an adhesive 4 is cured to press the lens 3 on the step 1a of the barrel 1, and the lens 3 is held by the barrel 1 with a definite pressure without the barrel being brought into contact with the lens 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to light sources, lenses, mirrors, etc. used in optical equipment such as optical heads.
The present invention relates to a method for bonding an optical component such as a prism or a photodetector to a holding member such as a lens barrel.

0002

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional method of bonding a lens to a lens barrel, as disclosed in, for example, Japanese Patent Publication No. 63-53522. In the figure, a cylindrical lens barrel 1, which is a holding member, has a through hole 2 consisting of a large diameter part 2a and a small diameter part 2b.
is provided. A lens 3, which is an optical component, is inserted into the large diameter portion 2a, and the peripheral edge 3a of the lens 3 is bonded to the adhesive portion, that is, the stepped portion 1a between the large diameter portion 2a and the small diameter portion 2b, with an adhesive 4. has been done. Further, the lens 3 is pressed against the stepped portion 1a by a pressing jig 5.

In the conventional method of adhering the lens 3 to the lens barrel 1, in order to control the film thickness of the adhesive 4 and to accurately position the lens 3, the pressing jig 5 is used until the adhesive 4 hardens. The lens 3 is held in the lens barrel 1 by pressing the lens 3 against the stepped portion 1a with a constant pressure.

0004

[Problems to be Solved by the Invention] In the conventional method of adhering the lens 3 to the lens barrel 1 as described above, when pressing the lens 3 with the pressing jig 5, if the size of the lens 3 is sufficient, the peripheral edge Although part 3a can be pressed, the recent miniaturization of optical components (micro-optics)
As the lens 3 becomes smaller due to the development of
The pressing jig 5 must be brought into direct contact with and pressed against the luminous flux transmitting portion (within the effective diameter). On the other hand, since the lens 3 is made of a material that is easily damaged such as glass or resin, and has been subjected to a surface treatment such as an anti-reflection coating, the surface of the material may be scratched by contact with the pressing jig 5. There have been problems in that the surface treatment may be damaged. Further, in order to avoid contamination of the lens 3, there was a problem in that the cleaning of the pressing jig 5 had to be strictly controlled.

The present invention was made with the aim of solving the above-mentioned problems, and it is possible to prevent the surface of the optical component from being damaged even when the optical component is downsized, and to provide a method for repairing the optical component. An object of the present invention is to obtain a method for adhering optical components that can save the effort of cleaning tools.

[0006]

[Means for Solving the Problems] A method for bonding optical components according to the present invention is to bond optical components to a holding member by creating a pressure difference between the inside and outside of the through hole of the holding member until the adhesive hardens. It is pressed onto the adhesive part of the

[0007]

[Operation] According to the present invention, the optical component is held by the holding member by being pressed against the adhesive portion at a constant pressure without direct contact due to the pressure difference between the inside and outside of the holding member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a method of adhering a lens to a lens barrel according to an embodiment of the present invention, and the same or corresponding parts as in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted. In the figure, a suction pump 7 is connected to the end of the lens barrel 1 on the small diameter portion 2b side via a suction pad 6.
As a result, the inside of the small diameter portion 2b is under negative pressure with respect to the outside air.

Next, a method of bonding the lens 3 will be explained. First, the lens 3 is inserted into the large diameter portion 2a of the lens barrel 1, and brought into contact with the stepped portion 1a coated with the adhesive 4. At the same time, a suction pad 6 connected to a suction pump 7 is pressed against the end of the lens barrel 1. Thereafter, the air inside the small diameter portion 2b is discharged by the suction pump 7, and the air pressure inside the small diameter portion 2b is maintained at a constant negative pressure with respect to the outside air. As a result, the lens 3 is pressed against the stepped portion 1a under constant atmospheric pressure and is held by the holding member 1. In this state, by curing the adhesive 4, the lens 3 is adhered to the correct position. In addition, by adjusting the pressure difference between the inside and outside of the small diameter portion 2b,
The film thickness of the adhesive 4 is controlled.

According to this method of bonding the lens 3,
Since there is no need to directly contact the lens 3, even if the lens 3 is small, damage to the material surface or surface treatment of the lens 3 can be prevented, and the lens 3 can be adapted to be made smaller. Further, since the suction pad 5 and the suction pump 6 do not come into contact with the lens 2, there is no need to clean them in particular, and the effort and effort of maintenance management is not a problem.

Although the lens 2 is shown as an optical component in the above embodiment, it is not limited to this, and other components such as a light source, mirror, prism, or photodetector may be used. Further, in the above embodiment, the cylindrical lens barrel 1 is shown as the holding member, but the holding member is not limited to this, and may be a plate-shaped prism mounting base having a through hole. By evacuating the inside of the hole, the same effect as in the above embodiment can be obtained. Furthermore, in the above embodiment, the inside of the small diameter part 2b of the through hole 2 was made to have a negative pressure with respect to the outside air, but depending on the shape of the holding member, the inside of the through hole 2 could be made to have a positive pressure with respect to the outside air to bond the optical components. It may be pressed against the part. For example, by injecting gas into the large diameter portion 2a in FIG. 1, the inside of the large diameter portion 2a may be maintained at a positive pressure with respect to the outside air, and the lens 3 may be pressed against the stepped portion 1a.

0012

Effects of the Invention As explained above, the method for adhering optical components of the present invention holds optical components by creating a pressure difference between the inside and outside of the through hole of the holding member until the adhesive hardens. Since it is pressed against the adhesive part of the component, it is possible to hold the optical component against the holding member with a constant pressure without contacting the optical component, and as a result, even when the optical component is downsized, the optical component can be It can prevent damage to the material surface and surface treatment, can be adapted to the miniaturization of optical components, and since it does not come into contact with optical components, it has the advantage of saving the effort of cleaning the jig.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a method of bonding a lens to a lens barrel according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example of a conventional method of bonding a lens to a lens barrel.

[Explanation of symbols]

1 Lens barrel (holding member) 1a Step part (adhesive part) 2 Through hole 3 Lens (optical parts) 4 Adhesive

Claims (1)

[Claims] 1. A method for adhering an optical component to a holding member having a through hole with an adhesive so as to close the through hole, wherein the through hole is closed until the adhesive hardens. A method for bonding optical components, characterized in that the optical component is pressed against the bonding portion of the holding member by creating a difference in air pressure between inside and outside air.