JP2001269847A - Sticking method and sticking member for optical element to centering fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sticking method capable of simply and accurately centering and sticking an optical element obtained by molding a heated and softened glass material to a centering fixture. SOLUTION: This sticking method includes a process that a clamp member 4, the optical element 3 obtained by molding the heated and softened glass material with a molding die, and a centering fixture 2 with an adhesive 5 are arranged in a tubular body 1 so that the clamp member 4 and the centering fixture 2 are concentrically arranged in the tubular body 1 to pinch the optical element 3, a process that the optical element 3 is pressed by the end face of the centering fixture 2 and the end face of the clamp member 4 for the centering of the optical element 3 by utilizing a wedge action, and a process that the optical element 3 is stuck to the centering fixture 2 by the adhesive 5 with the centered state maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a member for attaching an optical element to a centering member.

[0002]

2. Description of the Related Art As a centering method for an optical element such as a lens, for example, an optical centering method and a mechanical centering method are widely known.

As a method of optically centering a lens employed in a lens prism processing technique, there is a method using a reflected image.

In this method, as shown in FIG. 9, a rotation axis L of a rotationally driven holder 52 to which an optical element 51 is attached is attached.
(Reflection image) formed by reflecting an image of a distant light source (bulb or crosshair) placed almost parallel to the surface of the optical element 51
When viewed from the vicinity of the rotation axis L with the naked eye or a telescope, when the center of the optical element 51 is out, the surface of the optical element 51 does not swing as shown by the solid line in FIG. It uses the principle that the reflected image looks stationary,
This is a method in which the position of the optical element 51 is adjusted with a centering tool (not shown) so that the reflected image is stationary, and the optical element 51 is attached to the centering tool with an adhesive or the like at a position where the center comes out.

When the center of the optical element 51 is not out,
When the optical element 51 is attached to the holder 52 at an angle θ as shown in FIG.
Greatly fluctuates as shown by the dashed line in FIG. 9, and the reflected image also appears to move.

As a mechanical centering method employed in the lens prism processing technique, there is a bell clamp method. As shown in FIG. 10, the bell clamp system includes two cylindrical holders 61 and 6 which are arranged coaxially and opposed to each other.
When the optical element 51 is sandwiched between the optical elements 51 while being pressed therebetween, if there is a gap between the optical element 51 and the end faces of the holders 61 and 62, a wedge action is generated on the surface of the optical element 51 and the optical element 51 is slid by the sliding force. Uses the principle of sliding until both side surfaces thereof and the end surfaces of the holders 61 and 62 are completely adhered.

[0007]

However, when the centering is performed by the above-described optical centering method, it is difficult to determine whether the reflection image is moving when the optical element 51 is minute. And there is a limit in centering the optical element 51 having strict eccentricity.

[0008] Even when looking at the deflection of the reflected image on the surface of the optical element 51 on the centering side, it is difficult to confirm the reflected image because the rays are weakened inside the optical element. However, the reflected image of the light source was blurred, and it was difficult to accurately center the image.

The centering by the bell clamp method is as follows.
When the optical element 51 has a small diameter such as 5 mm or less in diameter, the optical element 51 clamped by the holders 61 and 62 moves due to vibration of a machine or the like, so that accurate centering cannot be performed. When the blood radius of the surface is large, there has been a problem that the optical element surface is hard to slip on the end faces of the holders 61 and 62 and accurate centering cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a centering device which can easily and accurately center and attach an optical element obtained by molding a heat-softened glass material to a centering member. It is intended to provide a method for sticking to an optical toy and a member for sticking an optical element capable of realizing such a method.

[0011]

According to a first aspect of the present invention, there is provided a method of attaching an optical element to a centering jig, wherein the optical element is obtained by molding a clamp member and a heat-softened glass material with a molding die. Arranging an element and a centering toy with an adhesive in a cylindrical body so that the clamp member and the centering yaw sandwich the optical element in a concentric arrangement with the cylindrical body; and Pressing the optical element by the end face of the toy and the end face of the clamp member, and centering the optical element by using a wedge action; and, while maintaining the centered state, the optical element to the centering toy. And a step of attaching with the adhesive.

In the method of attaching an optical element to a centering member according to the present invention, the center axis of the centering member and the center axis of the clamp member are coaxial (concentric) with the center axis of the cylindrical body. When there is a gap between the centering member and the optical element, and between the optical member and the clamping member, the centering member and the clamp member are inserted into the cylindrical body so as to sandwich the optical element, and pressed. A wedge effect occurs.

[0013] By the sliding force due to this wedge action, the surface of the optical element slides until it comes into complete contact with the end face of the centering member and the end face of the clamp member, thereby centering the optical element.

After centering the optical element in this way, the adhesive previously applied to the tip of the centering member is cured, and the optical element is attached to the end surface of the centering member.

According to a second aspect of the present invention, there is provided a method of attaching an optical element to a centering jig during a cooling step of an optical element after completion of molding by a mold comprising an upper mold and a lower mold arranged in a cylindrical body. Removing the upper mold from the cylindrical body;
The centering member with the adhesive is inserted into the cylindrical body and brought into contact with the optical element, and the optical element is pressed by the lower mold and the centering member and the centering of the optical element is performed using a wedge action. And a step of attaching the optical element to the centering tool with the adhesive while maintaining the centered state.

According to the present invention, instead of the clamp member according to the first aspect of the present invention, the lower mold used for molding is used to provide a space between the lower mold and the optical element and between the centering member and the optical element. The centering of the optical element is performed by the sliding force generated by the generated wedge action. Thereafter, the adhesive previously applied to the tip of the centering jig is hardened, and the optical element is attached to the end face of the centering jig.

According to a third aspect of the present invention, there is provided a member for attaching an optical element, comprising: a cylindrical member; a clamp member having an end face in contact with each of the optical elements arranged concentrically and opposed to the cylindrical member; It is characterized by being composed of a take-off toy.

According to the present invention, since the clamp member and the centering jaw having the end surface in contact with the optical element are concentrically opposed to each other in the cylindrical body, the optical element has a simple configuration. Centering can be easily performed.

According to a fourth aspect of the present invention, in the member for attaching an optical element according to the third aspect, the linear expansion coefficient of the cylindrical body <the linear expansion coefficient of the centering member = the linear expansion coefficient of the clamp member. , Characterized by being constituted by each material consisting of:

According to the present invention, since the cylindrical member is made of each material having a relationship of linear expansion coefficient <linear expansion coefficient of the centering member = linear expansion ratio of the clamp member, it is thermally joined by heating. As a result, the centers of the respective members coincide with each other with high precision, whereby the centering of the optical element can be performed with high precision.

According to a fifth aspect of the present invention, in the member for attaching an optical element according to the third or fourth aspect, the clamp member is a mold for the optical element.

According to the present invention, since a molding die is used as the clamp member, the optical element can be centered while reducing the number of steps.

[0023]

Embodiments of the present invention will be described below in detail.

(First Embodiment) (Configuration) FIG. 1 is a sectional view showing a member 10 for attaching an optical element 3 according to a first embodiment. The optical element 3 used in the first embodiment has a double-sided convex shape, and has an aspheric surface on each surface.

In FIG. 1, 1 is a hollow cylindrical body,
The central part is formed in a cylindrical shape hollowed out concentrically.

An outer peripheral portion of a substantially cylindrical centering toy 2 and a substantially cylindrical clamp member 4 are joined to the inner peripheral portion of the cylindrical body 1 so that they are concentrically arranged.
Each small diameter portion 2a, 4a is opposed to each other, and each end face 2b,
4b, the optical element 3 is arranged so as to sandwich it. The centering toy 2 has a through hole 2c.
The clamp member 4 has a through hole 4c.

In the first embodiment, brass is used as a material for the cylindrical body 1, the centering toy 2, and the clamp member 3.

The clearance between the inner periphery of the tubular body 1 and the outer periphery of the centering toy 2 joined to the inner periphery of the tubular body 1, the inner periphery of the tubular body 1, The clearance (gap) with the outer periphery of the clamp member 4 joined to the outer periphery is processed so as to be equal to or less than the eccentricity tolerance of the optical element 3.

Further, the end face 2b of the centering toy 2 and the end face 4b of the clamp member 4 are designed so that a wedge effect due to the contact with the optical element 3 is easily generated, that is, the contact surface with the optical element 3 is as large as possible. The optical element 3 is machined with an angle corresponding to the curvature of both surfaces.

(Operation) Next, the above-mentioned sticking member 1
A method of attaching the optical element 3 to the centering toy 2 by using the reference numeral 0 will be described.

First, as shown in FIG. 2, the clamp member 4 is inserted into the tubular body 1 with the end face 4b facing upward.

Next, the optical element 3 molded and processed using a jig or the like (not shown) is mounted on the clamp member 4 as shown in FIG.

Next, an adhesive 5 for adhering the optical element 3 is applied to the front end side of the centering toy 2 so that the end surface 4b faces downward as shown in FIG. Then, the insertion end face 4b is brought into contact with the surface of the optical element 3 in the cylindrical body 1.

As the adhesive 5, a mixture of pine resin 100 and rapeseed oil 3 was used. In this case, the mixing ratio may be slightly changed depending on conditions such as room temperature and humidity.

Next, the entire cylindrical body 1 is heated by heating means such as a heater (not shown). The heating temperature may be about the temperature at which the adhesive 5 is softened.
Heated to ° C.

In the first embodiment, the cylindrical body 1
Although the case where the whole is heated has been described, since the purpose of heating is to soften the adhesive 5 attached to the tip of the centering toy 2, a hole is formed in the side surface of the cylindrical body 1, The adhesive 5 may be heated by centering heat from a heating means such as an alcohol lamp through the hole and sending it only to the end face 2b of the toy 2.

Next, as shown in FIG.
Accordingly, the optical element 3 is pressed against the clamp member 4 with the pressing force F. At this time, the optical element 3 slides due to the sliding force generated by the wedge action generated on the end face 4 b of the clamp member 4 and the surface of the optical element 3, and the end face 2 b of the centering jaw 2 and the other surface of the optical element 3. When the wedge action has ceased, the operation is stopped, so that the optical element 3 is centered.

The pressing force F by the centering member 2 is determined by the outer diameter and the radius of curvature of the optical element 3.
Is too strong, the surface of the optical element 3 may be damaged. Conversely, if the pressing force F is weak, the optical element 3 does not slip and the centering cannot be performed.

Next, the entire cylindrical body 1 is cooled, the adhesive 5 at the tip of the centering member 2 is hardened, and the optical element 3 is attached to the end face 2b of the centering member 2.

In the first embodiment of the present invention, a mixture of pine resin and rapeseed oil is used as the adhesive 5, but an ultraviolet curable adhesive such as a modified urethane acrylate resin may be used. In this case, a hole may be provided in the cylindrical body 1 and ultraviolet rays may be irradiated from the hole toward the tip of the centering toy 2 to cure the ultraviolet curable adhesive.

Further, in the first embodiment, the centering toy 2, the clamp member 4, and the cylindrical body 1 are formed of the same material made of brass, but the cylindrical body 1 has a linear expansion coefficient of 5 ×. 10 ⁶
WC (tungsten carbide) material, and the centering jaw 2 and the clamp member 4 have a linear expansion coefficient of 17 × 1.
0 formed with ⁶ aluminum bronze, by thermal bonding them at a temperature of about during heating to soften the adhesive,
Further, the centering accuracy of the optical element 3 can be improved.

The relationship between the linear expansion coefficients of the cylindrical body 1, the centering jaw 2, and the clamp member 4 will be described in more detail.
When these are made of the same material, the rate of expansion by heating is the same, so that the gap between the members does not change at 20 ° C. or 50 ° C.

Now, let the linear expansion coefficient of the cylindrical body 1 be a,
Is the inner diameter of x, the linear expansion coefficients of the centering member 2 and the clamp member 4 are b (a <b), and the centering member 2 and the clamp member 4
Is assumed to be y (the outer diameters of the centering toy 2 and the clamp member 4 are the same), and x> y at room temperature (for example, 20 ° C.).

Under these conditions, at 20 ° C., the cylindrical body 1
The clearance between the centering toy 2 and the clearance between the cylindrical member 1 and the clamp member 4 is the same as Δx × (1 + a × 2)
0) {-{y × (1 + b × 20)}.

On the other hand, when heated to, for example, 50 ° C., the gap between the tubular body 1 and the centering toy 2 (the same is true for the gap between the tubular body 1 and the clamp member 4) is Δx × (1 + a ×
50) {-{y × (1 + b × 50)}.

Here, x, a, y, and b are constants, and x and y can be approximated to be substantially equal. Therefore, from the above equations, the case of 50 ° C. is more cylindrical than that of 20 ° C. The gap between the body 1 and the centering toy 2 (the same applies to the gap between the tubular body 1 and the clamp member 4) is reduced. Note that ｛x × (1 + a
× 20)｝ = {y × (1 + b × 50)} It is ideal to process the dimensions x and y, but since processing accuracy is involved in practice, {xx × (1 + a
× 20) 交差 = {y × (1 + b × 50)}.

As described above, the respective materials are selected so that the linear expansion coefficient a of the cylindrical body 1 <the linear expansion coefficient b of the centering member 2 = the linear expansion coefficient b of the clamp member 4 is satisfied. The outer peripheral portions of the centering toy 2 and the clamp member 4 are more densely thermally bonded to the inner periphery of the tubular body 1, so that the concentric precision of the tubular body 1, the centering toy 2, and the clamp member 4 is increased. Thereby, the centering accuracy of the optical element 3 centered between the centering member 2 and the clamp member 4 can be improved.

(Effect) According to the first embodiment, an accurate centering of the optical element 3 can be performed without using an optical centering as in the conventional example by using the attaching member 10 having a simple structure. It can be carried out.

(Embodiment 2) (Structure) FIG. 6 is a cross-sectional view showing an attaching member 20 according to Embodiment 2 of the present invention, and FIG. 7 is a portion of an optical element 13, a clamp member 14, and a centering toy 2. It is an expanded sectional view.

The optical element 13 used in the second embodiment is
It has a meniscus shape and has a flat portion 13b on the outer periphery of the concave surface portion 13a on the lower surface side. Further, the concave portion 13a and the upper surface portion 13c are formed as aspheric surfaces.

The clamp member 14 according to the second embodiment is a member for pressing the optical element 3 with the centering jaw 2. A convex end surface 14 having the same shape as the concave surface portion 13a and the flat surface portion 13b of the optical element 13 is provided in an end surface region of the clamp member 14.
a, a flat end surface 14b is formed. Other configurations are the same as those of the first embodiment.

(Function and Effect) In the second embodiment, since the clamp member 14 has the same shape as the optical element 13, a wedge effect is easily generated at the time of pressing, and the cleanliness is higher than in the case of the first embodiment. The centering of the optical element 13 can be performed.

In the second embodiment, the end surface area of the clamp member 14 is set to the concave surface portion 13 a of the optical element 13.
The optical element 1 is arranged upside down, and the end surface 2b of the centering toy 2 is
Even when the concave portion 13a and the flat portion 13b have the same shape, the optical element 13 can be slid and centered by the wedge action.

(Embodiment 3) (Structure) An attaching member 40 according to Embodiment 3 of the present invention will be described with reference to FIG.

In the third embodiment, the lower die used for forming the optical element 3 is used as the clamp member 31. Also, the cylindrical body 30 used at the time of molding was used. Other configurations are the same as those of the first embodiment.

(Operation) After the molding of the optical element 3 is completed,
During the cooling step, the upper mold (not shown) is removed from the inside of the tubular body 30. Next, the centering jaw 2 to which the adhesive 5 is adhered is inserted into the cylindrical body 1.

Next, the optical element 3 is pressed by the centering jaw 2 and the lower clamp member 31. The optical element 3 is
End face 2b of centering toy 2 and end face 3 of clamp member 31
The centering is completed when the ball 1b no longer slides.

Next, the cooling step of the optical element 3 is continued, and the adhesive 5 applied to the tip of the centering toy 2 is cured.
The optical element 3 is attached to the tip of the centering stopper 2.

(Effect) According to the third embodiment, since the lower mold used at the time of molding is used as the clamp member 31 as it is, the optical element 3 after molding is removed from the cylindrical body 30 and separately prepared. The step of transferring the clamp member into the cylindrical body into which the clamp member is inserted can be omitted,
It is possible to reduce the total number of steps from molding the optical element 3 to attaching the optical element 3 to the centering toy 2.

Since the lower mold is used as the clamp member 31, the optical element 3 having various shapes such as a spherical surface, a conical shape, and a free-form surface shape can be centered and attached to the centering member 2.

[0061]

According to the first aspect of the present invention, the centering member and the clamp member are inserted into the cylindrical body so as to sandwich the optical element, and are pressed by simple means without using an optical system or the like. It is possible to provide a method of attaching an optical element to a centering toy that can accurately center and attach the optical element to the centering yat.

According to the second aspect of the present invention, the lower mold used for molding is used to center the center by the sliding force generated by the wedge action generated between the lower mold and the optical element and between the centering toy and the optical element. And a method for attaching the optical element to the centering member which can be attached to the end face of the centering member can be provided.

According to the third aspect of the present invention, it is possible to provide an optical element sticking member which can easily center the optical element with a simple configuration.

According to the fourth aspect of the present invention, it is possible to provide an optical element sticking member capable of performing high-precision centering of the optical element.

According to the fifth aspect of the present invention, there is provided an optical element sticking member capable of centering the optical element while reducing the number of steps by using a molding die as a clamp member. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a member for attaching an optical element according to a first embodiment of the present invention.

FIG. 2 is a process explanatory diagram of a method of attaching an optical element to a centering stopper according to the first embodiment of the present invention.

FIG. 3 is a process explanatory diagram of a method of attaching an optical element to a centering stopper according to the first embodiment of the present invention.

FIG. 4 is a process explanatory diagram of a method of attaching the optical element to the centering member according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing steps of a method of attaching the optical element to the centering member according to the first embodiment of the present invention.

FIG. 6 is a sectional view illustrating a member for attaching an optical element according to a second embodiment of the present invention.

FIG. 7 is a partially enlarged sectional view of a member for attaching an optical element according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing a member for attaching an optical element according to a third embodiment of the present invention.

FIG. 9 is a schematic explanatory view showing a conventional method of centering an optical element by a reflection method.

FIG. 10 is a schematic explanatory view showing a conventional centering method of an optical element by a bell clamp method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Centering toy 2a Small diameter part 2b End surface 2c Through hole 3 Optical element 4 Clamp member 4a Small diameter part 4b End surface 4c Through hole 5 Adhesive 10 Adhering member 13 Optical element 14 Clamp member 20 Adhering member 30 Tubular body 31 Clamp member 40 Pasting member

Claims (5)

[Claims] 1. A clamping member, an optical element obtained by molding a heat-softened glass material by a molding die, and a centering member with an adhesive in a cylindrical body. Arranging the optical element so as to sandwich the optical element in a concentric arrangement with the cylindrical body, and pressing the optical element by an end face of a centering toy and an end face of a clamp member, and utilizing the wedge action to make the optical element A step of centering the optical element on the centering tool with the adhesive while maintaining the centered state. Pasting method. 2. A step of taking out the upper mold from the cylindrical body during the cooling step of the optical element after the molding by the mold including the upper mold and the lower mold arranged in the cylindrical body, and applying an adhesive. Inserting the centering jaw into the cylindrical body and contacting the optical element, and centering the optical element using a wedge action by pressing the optical element with the lower mold and the centering jaw; Attaching the optical element to the centering jig with the adhesive while maintaining the centered state. A method for attaching the optical element to the centering jig. 3. An optical element comprising: a cylindrical tubular body; a clamp member provided with an end face in contact with the optical element, and a centering member disposed in the tubular body so as to be in contact with the optical element. For pasting. 4. The optical element according to claim 3, wherein the optical element is made of a material having a relationship of linear expansion coefficient of the cylindrical body <linear expansion coefficient of the centering member = linear expansion coefficient of the clamp member. For pasting. 5. The member for attaching an optical element according to claim 3, wherein the clamp member is a mold for the optical element.