A method for optical bonding of small-caliber optical components

Abstract

The present invention provides a method for photobonding small-caliber optical components, which can better ensure that optical components with small caliber and relatively small radius R value, such as lenses, can be successfully photobonded. The steps are as follows: the first optical component to be photobonded is glued with UV glue and a base, and then exposed and fixed; the sleeve is fixed with the base, the first optical component is located in the lower part of the sleeve, and the sleeve is circumferentially provided with at least 3 threaded holes, and the threaded holes have matching screws; after cleaning the arc surface of the second optical component to be photobonded, the second optical component is adsorbed with a suction pen, and the second optical component is placed on the photobonded surface of the first optical component; the screw is opposite to the outer cylindrical surface of the second optical component; the center image position of the second optical component is observed with a center checker, and the screw is adjusted so that the optical axes of the first optical component and the second optical component are coaxial; each screw is adjusted so that the screw is close to the outer cylindrical surface of the second optical component; the second optical component is vertically pressed from the top of the sleeve to perform photobonding of the first optical component and the second optical component.

Description

Technical Field

[0001] The invention relates to the technical field of optical adhesives for optical elements such as lenses. Background Art

[0002] The methods for combining optical components generally include mechanical method, gluing method and optical gluing method.

[0003] The mechanical method uses mechanical parts (such as spacers, pressure rings, etc.) to combine several optical components to form a complex optical component. The gluing method uses optical-grade transparent glue to glue several optical components into a complex optical component. The optical glue method relies on the molecular attraction between the polished surfaces of the parts to combine several optical components into a complex optical component.

[0004] With the advancement of technology, the gluing process of optical parts has basically matured in the field. At present, the gluing scheme of lenses is still mainly based on the use of UV light-cured shadowless glue, but due to the increasing application of deep ultraviolet fields and some special requirements, the application of optical glue technology has also become more frequent. However, the current optical glue process is not comprehensive, and there is only a part of the optical glue technology for double-plane lenses and relatively large-diameter and large-radius R-value lenses. However, with the demand for lightweight instruments and some limitations of optical design, the above process can no longer meet the needs.

[0005] Therefore, how to photobond optical components with relatively small diameter and small radius R value has become an urgent matter. Summary of the invention

[0006] The purpose of the present invention is to provide a method for optical bonding of small-diameter optical components, which can better ensure that optical components with small diameter (optical component diameter ≤ 10mm) and relatively small radius R value, such as lenses, can be successfully optically bonded.

[0007] The present invention provides a method for photobonding a small-caliber optical component, comprising the following steps: applying UV glue to a first optical component to be photobonded and to a base, and then exposing and fixing the same;

[0008] The sleeve is fixed to the base, the first optical element is located in the lower part of the sleeve, at least three threaded holes are opened in the circumference of the sleeve, and matching screws are arranged in the threaded holes;

[0009] After cleaning the curved surface of the second optical component to be treated with photoresist, use a suction pen to absorb the second optical component, pass it through the upper opening of the sleeve, and place the second optical component on the photoresist surface of the first optical component; the screw is opposite to the outer cylindrical surface of the second optical component;

[0010] Observe the central image position of the second optical element with a center checker, and adjust the screws so that the optical axes of the first optical element and the second optical element are coaxial;

[0011] After the central image position of the second optical element meets the requirements, adjust each screw so that the screw is close to the outer circle of the second optical element;

[0012] The second optical component is vertically pressed from above the sleeve to optically bond the first optical component to the second optical component.

[0013] The above-mentioned method for optical bonding of small-caliber optical components further comprises the following steps:

[0014] After the photoresist is completed, use UV glue to fill the outer circle gap between the photoresist surfaces of the two optical parts and expose and cure them.

[0015] The above-mentioned method for photobonding small-caliber optical components also includes the following steps: after the photobonded component is completed, the sleeve is removed from the base, and the photobonded optical component is separated from the base by heating.

[0016] The above-mentioned method for optical bonding of small-diameter optical components uses a pressing device to press the second optical component, and the pressing device includes a threaded disk, a spring, a guide block, and a pressure rod; the outer periphery of the guide block cooperates with the inner hole of the sleeve, and a pressure rod coaxial with the second optical component is fixed to the lower end of the guide block, and the threaded disk cooperates with the inner hole of the upper part of the sleeve by thread; a spring is arranged between the guide block and the threaded disk; the threaded disk is rotated to move the threaded disk downward, and the guide block and the pressure rod are pushed downward by the spring, thereby pressing the second optical component.

[0017] The beneficial effects of the present invention are as follows: after the center image position of the second optical component meets the requirements, each screw is adjusted so that the screw is slightly against the outer circle of the second optical component, and then the second optical component is pressed. The screw in contact with the second optical component can prevent its position from changing or changing significantly in the radial direction, thereby avoiding a large deviation in the center image position of the second optical component and ensuring the qualified rate of the product after photo-bonding.

[0018] A pressing device with a specific structure is used to press the second optical component to ensure that the pressing rod and the second optical component move downward coaxially. At the same time, the spiral pressing plate is rotated to gradually apply pressure through the spring, so that the second optical component gradually fits with the first optical component to ensure the quality of the optical glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0020] Figure 1 It is a flow chart of the photoresist method;

[0021] Figure 2 A schematic diagram of the glue fixation between the base and the first optical component;

[0022] Figure 3 It is a schematic diagram when the sleeve is connected to the base;

[0023] Figure 4 A schematic diagram of a pressing device pressing a second optical element;

[0024] Figure 5 It is the front view of the sleeve;

[0025] Figure 6 It is a cross-sectional view of the sleeve rotation;

[0026] Figure 7 It is a top view of the sleeve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] S101: First, prepare the optical parts to be photo-bonded (the processing and environmental requirements of the optical parts used as photo-bonded will not be elaborated here)

[0029] S102: See Figure 3 The operator uses UV glue to spot glue and calibrate the first optical component (lens) 4 to be photo-bonded with the base 1, keeps the optical axis of the first optical component coaxial with the outer circle 11 of the base as required, and then exposes and fixes it.

[0030] S103: See Figure 3 , the first optical element 4 and the base 1 are firmly glued together, and the sleeve 2 is connected to the base 1 by threads, and the end surface 12 of the base contacts the inner bottom surface of the sleeve;

[0031] S104: Deeply clean the R surfaces of the first optical component 4 and the second optical component 5 on the photoresist, and then use a micro suction pen to absorb the second optical component 5 and gently place the second optical component on the photoresist surface of the first optical component.

[0032] See also Figure 5-7 The sleeve 2 has 4 hand holes 21 evenly arranged around the circumference, and 8 threaded holes 22 on the sleeve 2, divided into two layers, each layer of 4 threaded holes evenly distributed around the circumference of the sleeve 2. The four threaded holes corresponding to the outer circumference of the second optical element have screws (not shown) that match them.

[0033] S105: Then use a transmission-type center checker to observe the center image position of the second optical component 5, and use hands and screws to assist in adjusting the position of the second optical component through the hand hole and threaded hole of the sleeve, and calibrate the image as required to make the optical axes of the first optical component and the second optical component coaxial.

[0034] S106: See Figure 4 When the center image of the second optical component is adjusted, the two optical components are photo-bonded using a pressing device from above the sleeve.

[0035] The pressing device 3 includes a threaded disc 31, a spring 32, a guide block 33, and a pressure rod 34. The outer periphery of the guide block matches the inner hole of the sleeve, a pressure rod coaxial with the second optical element is fixed to the lower end of the guide block, and the threaded disc matches the inner hole of the upper part of the sleeve with a thread; a spring is arranged between the guide block and the threaded disc. When pressing, the threaded disc is gradually rotated so that the threaded disc moves slowly downward, and the guide block and the pressure rod are pushed downward by the spring, thereby gradually applying force to press the second optical element.

[0036] Since the optical component has a small aperture and is very light in weight, in order to ensure that the central image of the second optical component does not move when pressed, it is necessary to screw the screw into the threaded hole of the sleeve after adjusting the central image of the second optical component so that it is lightly pressed against the outer circle of the second optical component to play a certain fixing role.

[0037] If displacement occurs during the process of pressing and bonding the optical glue, or the cleanliness is affected, the two optical parts must be separated by heating them at an appropriate distance with a hot air gun, and then the optical glue operation must be performed again until the ideal state is achieved.

[0038] S107: After the photoresist of the two optical components is completed, a small amount of UV glue is used to fill the outer circle gap of the photoresist surfaces of the two optical components and the mixture is exposed and cured to prevent the photoresist surfaces from being separated due to external factors.

[0039] S108: If a third optical component optical adhesive is needed, the operation process similar to the above two optical component optical adhesives can be repeated. After the optical adhesive is completed, the completed optical component and the base can be separated by high-frequency instantaneous heating.

[0040] The optical axis of the first optical component is adjusted to be coaxial with the outer circle 11 of the base as required and then fixed after exposure, the center image position of the second optical component is observed by a center checker, the position of the second optical component is adjusted, and the image is corrected as required to make the optical axes of the first optical component and the second optical component coaxial. Such technologies belong to the prior art. In fact, there are many methods for centering, for example, centering by focus of transmitted image, centering by reflected image of spherical center, centering by laser interferometry, etc.

Claims

1. A method for optical bonding of small-caliber optical components, characterized by: The steps include: applying UV glue to the first optical component to be photo-bonded and the base, and then exposing and fixing the same; The sleeve is fixed to the base, the first optical element is located in the lower part of the sleeve, at least three threaded holes are opened in the circumference of the sleeve, and matching screws are arranged in the threaded holes; After cleaning the curved surface of the second optical component to be treated with photoresist, use a suction pen to absorb the second optical component, pass it through the upper opening of the sleeve, and place the second optical component on the photoresist surface of the first optical component; the screw is opposite to the outer cylindrical surface of the second optical component; Observe the central image position of the second optical element with a center checker, and adjust the screws so that the optical axes of the first optical element and the second optical element are coaxial; After the central image position of the second optical element meets the requirements, adjust each screw so that the screw is close to the outer circle of the second optical element; The second optical component is vertically pressed from above the sleeve to optically bond the first optical component to the second optical component.

2. The method for optical bonding of small-diameter optical components according to claim 1, characterized in that: It also includes the following steps: After the photoresist is completed, use UV glue to fill the outer circle gap between the photoresist surfaces of the two optical parts and expose and cure them.

3. The method for optical bonding of small-diameter optical components according to claim 1, characterized in that: The method further comprises the following steps: after the photo-bonded component is completed, the sleeve is removed from the base, and the photo-bonded optical component is separated from the base by heating.

4. The method for optical bonding of small-diameter optical components as claimed in claim 1, characterized in that: A pressing device is used to press the second optical component, and the pressing device includes a threaded disc, a spring, a guide block, and a pressure rod; the outer periphery of the guide block cooperates with the inner hole of the sleeve, a pressure rod coaxial with the second optical component is fixed to the lower end of the guide block, and the threaded disc cooperates with the inner hole of the upper part of the sleeve by thread; a spring is arranged between the guide block and the threaded disc; the threaded disc is rotated to move the threaded disc downward, and the guide block and the pressure rod are pushed downward by the spring, thereby pressing the second optical component.

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