JPH0450905A - Method for mounting optical element to holding frame - Google Patents

Abstract

PURPOSE:To release and relieve generated stresses by adhering an optical element to a holding frame via an adhesive layer in the entire region of a joint part contg. a partially formed release agent layer and separating the adhesive layer and the release layer from each other by oscillation, etc. CONSTITUTION:The release agent layer 7 is formed partially to the joint part 5 of the holding frame 2 of the optical element 1 and is dried. The optical element 1 is adhered to the holding frame 2 by the adhesive layer 8 formed in the entire region in the joint part 5. Boundary destruction is generated between the release agent layer 7 and the adhesive layer 8 by applying ultrasonic oscillation or heat shock, etc., to separate the two layers 7, 8 from each other. The adhesive layer 8 part existing in the part not coated with the release agent is mounted as the adhesive part 8' to the holding frame 2. The generated stresses are surely suppressed in this way and the optical element 1 is mounted to the holding frame 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of attaching an optical element to a holding frame.

[Conventional technology]

In recent years, devices such as holding frames have tended to become smaller, and for this reason, adhesives have been used to attach optical elements to holding frames. This is optical.

It is applied in a wide range of technical fields such as electricity.

Generally, when attaching an optical element to a holding frame using an adhesive, it is not enough to simply hold the optical element, but a flexible adhesive is used to suppress stress generated due to changes over time or external force loads, for example. As described in JP-A-59-135406 and JP-A-60-79313, the entire outer periphery of the optical element may be glued to the holding frame, or projections or notches may be formed on the optical element or the holding frame. The optical element is partially, ie, point-bonded, using the protrusion or the like to hold the optical element in the holding frame.

[Problem to be solved by the invention]

When attaching an optical element to a holding frame with a flexible adhesive, in the former case where the entire outer periphery of the optical element is glued to the holding frame, stress can be evenly distributed, but the performance of the adhesive This largely determines the stress generation conditions, and therefore the selection of adhesive must be considered.

Alternatively, even if the adhesive is partially held, that is, point bonded, stress is generated only in the adhesive application area due to the expansion and contraction of the adhesive, causing optical distortion such as large asperities and coma.

As described in each of the above-mentioned publications, the method of suppressing circular shape and optical distortion by providing projections, etc. on the optical element or holding frame is to increase the size to further alleviate the stress generated in order to secure the optical effective range. The protrusion is provided in a portion outside the optically effective range of the optical element, or the portion outside the optically effective range is expanded and enlarged more than necessary to provide a partial cutout. Therefore, in these cases, the optical element itself becomes larger than necessary, and the inner diameter of the holding frame that engages and holds the optical element must also be increased. Naturally, the overall size is large, and therefore it cannot necessarily meet the demand for the above-mentioned miniaturization trend.

Furthermore, although it is not difficult to apply the method of providing notched protrusions to optical elements and holding frames made of synthetic resin, it is difficult to apply the method to optical elements made of glass or holding frames made of metal. It is extremely difficult to apply, and even if it can be applied, it lacks design simplicity and does not look good.

The present invention was devised by focusing on such problems, and it is possible to secure the same effective optical range as before, without making the optical element larger than necessary, and reliably suppressing the stress generated. In order to provide a method for attaching an optical element to a holding frame, a release agent layer is partially formed on the joint part of the holding frame or the optical element, and this is dried, and the layer is formed over the entire area between the joint parts. After the optical element is bonded to the holding frame using an adhesive layer, the release agent layer and the adhesive layer are separated from each other by vibration or other means.

〔Example〕

Hereinafter, a method for attaching the optical element of the present invention to a holding frame will be explained based on the apparatus shown in the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the apparatus according to the present invention, in which FIG. 1(a) is a longitudinal cross-sectional view, and FIG. 1° C.) is a plan view.

In each figure, 1 is an optical element, 2 is a holding frame, 3 is an optical element abutting part, 7 is a release agent layer, and 8 is an adhesive layer. A mold release agent layer 7 is formed by applying a mold release agent at equal intervals to the joint portions 5 (corresponding to the joint portions referred to in claim 1) (hereinafter the same).

The part where the release agent is not applied between the release agent layers 7 and 7 becomes the adhesive part 8' with the optical element 1, but the size (width) or number of the part where the release agent is not applied is arbitrary. However, at least the spacing between the non-coated parts, that is, the spacing between the release agent layers 7.7, should be equal.

Then, the mold release agent layer 7 is dried by any means, and after drying,
The optical element 1 on which an adhesive layer 8 is formed by applying an adhesive to the entire outer periphery (corresponding to the joint part in claim 1, the same applies hereinafter) 4 is placed inside the inner periphery 5 of the holding frame 2. The adhesive layer 8 is cured by any means. However, after drying the mold release agent layer 7, the optical element 1 is engaged in the inner circumferential edge 5 of the holding frame 2, and the optical element abutting part 3 is pressed against the holding frame 2. Inner peripheral edge portion 5 including 7 parts of the mold release agent layer
The entire area of the gap 6 formed by the outer peripheral edge 4 of the optical element 1 may be filled with an adhesive to form an adhesive layer 8, and this may be cured.

Next, an external force such as ultrasonic vibration or heat shock is applied to cause interfacial destruction between the mold release agent layer 7 and the adhesive layer 8, thereby separating both layers 7 and 8 from each other and removing the mold release agent. The state in which the optical element 1 is attached to the holding frame 2 is obtained by using the adhesive layer 8 existing in the applied area as the adhesive part 8'.

According to the first embodiment, one end of the entire outer peripheral edge 4 of the optical element 1 is bonded to the holding frame 2, so that the stress applied to the optical element 1 can be uniformly distributed, as shown in FIG. Extreme candy that occurs when dot gluing from the beginning. By suppressing optical distortion such as coma and causing interfacial destruction between the mold release agent layer 7 and adhesive layer 8 to separate them from each other as shown in FIG. 5, stress is released and optical distortion is alleviated. I can do it.

Moreover, by applying a mold release agent to the inner peripheral edge 5 of the holding frame 2 to form a mold release agent layer 7 and drying this, there is a risk that the low-viscosity mold release agent will spread into the optically effective range of the optical element 1. There is no need to apply the mold release agent in an accurate amount, and therefore no skill is required for the application work.

(Second Embodiment) FIG. 2 shows a second embodiment of the apparatus according to the present invention, in which FIG. 2(a) is a longitudinal sectional view and FIG. 2(b) is a plan view.

In this second embodiment, instead of applying a mold release agent to the inner peripheral edge 5 of the holding frame 2 to form the mold release agent layer 7 as described in the first embodiment, the outer peripheral edge 4 of the optical element 1 is The only difference is that the mold release agent layer 7 is formed by applying a mold release agent to the second embodiment, and the remaining points are almost the same as those of the first embodiment.

In the second embodiment, in addition to the effects of the first embodiment, the mold release agent layer 7 is coated on the outer peripheral edge 4 of the optical element 1, so the workability is improved, and the hot air By using a drying means, automation becomes easier.

(Third Embodiment) FIG. 3 shows a third embodiment of the apparatus according to the present invention, in which FIG. 3(a) is a longitudinal sectional view and FIG. 3(0)) is a plan view.

In the third embodiment, unlike the first and second embodiments in which the optical element l is a lens, a prism is used. That is, a mold release agent layer 7 is formed by applying a mold release agent to the joint 10 of the holding frame 2, and the mold release agent layer 7 is formed by applying the mold release agent layer 7 to the part where the mold release agent is not applied as appropriate. The drying process is carried out using several methods, and then dried by any method. After that, adhesive is applied to the joint part 9 of the optical element 1, the joint part 10 of the holding frame 1, or the front joint part 9.10 to form an adhesive layer 8, and the optical element is applied to the part 3. By bonding the holding frame 2 and the optical element 1 to each other and curing the adhesive layer 8 by any means, the optical element 1, which is a prism, is attached to the holding frame 2.
The result is a state where it is attached to the

The rest is almost the same as the first embodiment, and in addition to the effects shown in the first embodiment, the effect of this embodiment is that a release agent layer 7 is applied to the joint 5 of the holding frame 2. By obtaining the adhesive layer 8, it becomes easy to position the adhesive 8', in which only the adhesive layer 8 is formed by applying the adhesive.

〔Effect of the invention〕

In the present invention, a release agent layer is partially formed on an optical element or a holding frame, and this is dried, and the optical element is attached to the holding frame through an adhesive layer in the entire joint including the release agent layer. Since it is an adhesive, it is possible to uniformly diffuse the stress that has previously occurred, and since the adhesive layer and release agent layer are separated from each other by vibration, etc., it is possible to release and alleviate the stress that has already occurred. can.

Regarding the usefulness of the present invention, the strain inside the optical element (internal strain) was evaluated by the movement of the isogyer using a polarizing microscope. As a result, the movement of the isogyer was large when the entire joint part of the optical element was bonded to the holding frame. , that is, the internal strain is large, but it has been proven that by separating the adhesive layer and the release agent layer, a state in which slight movement can be seen, that is, the internal strain is reduced.

[Brief explanation of drawings]

FIG. 1(a) is a longitudinal sectional view showing a first embodiment of the device according to the present invention, FIG. 1(c) is a plan view thereof, and FIG. 2(a) is a longitudinal sectional view showing the second embodiment of the device. Fig. 2, etc.) are the same plan views, Fig. 3
Figure (a) is a vertical cross-sectional view of the third embodiment, Figure 3 (■) is a plan view thereof, Figure 4 is a plane view showing the state of interference fringes of the optical element according to the conventional example, and Figure 5 is the method of the present invention. FIG. 3 is a plan view showing the state of interference fringes of an optical element using the optical element. 1... Optical element 2... Holding frame 4... Outer circumferential edge of optical element 5... Inner circumferential edge of holding frame 7... Release agent layer 8... Adhesive layer 8'.・・Adhesive part diagram (a) Figure 8 (a) (b) No. '2 (a) Figure 1 → - °1 (b) ρ1

Claims (2)

[Claims] (1) Form a release agent layer partially on the joint of the holding frame or the optical element, dry it, and bond the optical element to the holding frame with the adhesive layer formed over the entire area between the joints. A method for attaching an optical element to a holding frame, the method comprising: thereafter separating the release agent layer and the adhesive layer from each other by vibration or other means. (2) Form a release agent layer partially at equal intervals on the inner circumference of the holding frame or the outer circumference of the optical element, dry this, and then An optical element characterized in that the optical element is adhesively held on a holding frame via an adhesive layer formed on the entire outer periphery, and then the release agent layer and the adhesive layer are separated from each other by vibration or other means. How to attach the to the holding frame.