JPH06134370A - Adhesive coating device - Google Patents

Abstract

PURPOSE:To provide an adhesive coating device capable of surely separating a lens after coating of the adhesive and a coating shaft. CONSTITUTION:In the adhesive coating device consisting of a case 4 retaining the adhesive 3, a coating arm 7 provided in the case 4 freely and vertically and the coating shaft 8 supporting a lower edge by the coating arm 7 and also having an adhesive applying surface at an upper edge, a stopper member 12 for abutting and supporting lens 11 to be coated from the lower surface is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive application device used to apply an adhesive to a lens to which a jig is attached.

[0002]

2. Description of the Related Art Conventionally, as this type of adhesive coating device, for example, a device disclosed in Japanese Patent Laid-Open No. 63-27068 is known. As shown in FIG. 5 (a), this device is for applying an adhesive to the lower surface of the lens 11 held by the suction pad 10, and is provided in the case 4 in which the thermoplastic adhesive 3 is stored. A coating arm 8 is provided so as to be vertically movable, and an adhesive attachment surface is provided on the upper end of the coating shaft 7 at the tip of the coating arm 8. In this device, the coating arm 8 is lowered to immerse the entire coating shaft 7 in the adhesive 3, and then it is pulled up again to abut the upper end surface of the coating shaft 7 against the lower surface of the lens 11 to apply the adhesive. To do.

[0003]

However, in the above adhesive applying device, as shown in FIG. 5B, when the applying shaft 8 is lowered after applying the adhesive, the lens 11 remains attached to the applying shaft 8. There is a problem that it may be drawn into the adhesive 3. In this device, the suction force of the suction pad 10 is originally set so that such a situation does not occur, but the pull-in may occur due to variations in the adhesive force due to the influence of the viscosity and amount of the adhesive, application time, and the like. It was Then, the pulled-in lens accumulates in the case 4, causing malfunction of the coating arm 8.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an adhesive coating device which can surely separate the lens and the coating shaft after the adhesive is coated.

[0005]

In order to achieve the above object, in an adhesive applying apparatus of the present invention, a case for storing an adhesive, an applying arm provided in the case so as to be vertically movable, and the applying arm. In the adhesive coating device including the coating shaft having the lower end supported at the upper end and the adhesive attachment surface at the upper end, the stopper member for contacting and supporting the lens to be coated from the lower surface is provided.

That is, in the present invention, as shown in FIG. 1, the stopper member 12 is provided so as to contact the lower surface of the lens 11.

[0007]

In the adhesive applying device of the present invention having the above-mentioned structure, the lower surface of the lens is supported by the stopper member 12 even when the lens 11 and the applying shaft 7 after the adhesive is applied are adhered. The lens 11 is reliably separated by lowering the coating shaft 7.

Some embodiments of the adhesive coating device according to the present invention will be described below with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

[0009]

First Embodiment First, a first embodiment of the present invention will be described. Figure 2
FIG. 3 is a diagram showing an adhesive application device, (a) shows the time when the adhesive is applied, and (b) shows the time when the lens and the application axis are separated. In the figure, a plate heater 2 is provided on the base plate 1.
Is attached, and a case 4 that stores the thermoplastic adhesive 3 is fixed to the upper surface thereof. A temperature sensor 5 detects the temperature of the adhesive 3, and a temperature controller 6 controls ON / OFF of the plate heater 2. Further, the coating shaft 7 can be vertically moved up and down by a coating arm 8 as in the conventional example, and an adhesive attaching portion is formed at the tip. Incidentally, 9 is a drive mechanism for moving the coating arm 8 up and down.

In this embodiment, the stopper cap 12 is provided as the stopper member. The stopper cap 12 is placed on the upper surface of the case 4, and the lens 11 is placed in the center thereof.
The slit portion is formed so as not to interfere with the coating arm 8 while having a ring-shaped opening to contact with.

Next, the operation of this embodiment will be described. First,
A plate-like heater 2 is heated by putting a solid thermoplastic adhesive in the case 4. The heat-melted adhesive 3 is a temperature controller 6
To maintain a constant temperature. In this state, the coating arm 8 is lowered to immerse the entire coating shaft 7 in the adhesive 3,
This is pulled up again, the upper end surface of the application shaft 7 is abutted against the lower surface of the lens 11, and the adhesive is applied. After that, coating shaft 7
When the lens is lowered, the lens 11 is supported by the stopper cap 12, so that the lens 11 is reliably separated from the coating shaft 7 to complete the coating operation.

In this embodiment, since the stopper cap 12 as the stopper member is simply placed on the case 4, there is an advantage that the stopper cap 12 can be easily exchanged and detached and the maintainability is good.

[0013]

Second Embodiment Next, a second embodiment of the present invention will be described. Figure 3
FIG. 3 is a diagram showing an adhesive application device. As shown, in this embodiment, the screw ring 13 is provided as a stopper member. The screw ring 13 has a cylindrical shape that is screwed into and fixed to a threaded portion on the bottom surface of the case 4, and a slit for moving up and down the coating arm 8 is formed on the side surface of the cylinder.

In this embodiment, since the screw ring 13 as the stopper member is fixed to the case 4, the lens 1
The separation position between 1 and the coating shaft 7 and the coating position are constant, stable coating is possible, and the controllability of the coating amount can be improved.

[0015]

Third Embodiment Next, a third embodiment of the present invention will be described. Figure 4
FIG. 3 is a diagram showing an adhesive application device. As shown, in this embodiment, the floating ring 14 is used as a stopper member.
Will be provided. The floating ring 14 is formed so as to float on the adhesive 3, has a ring-shaped opening that should come into contact with the lens 11, and has a slit so as not to interfere with the coating arm 8.

In this embodiment, the floating ring 14
The lens 11 and the coating shaft 7 are separated by the buoyancy of Further, since the floating ring 14 is floated on the adhesive 3, the lens 11 can always keep the height from the liquid surface of the adhesive 3 constant. From this, the following unique effects occur.

That is, the amount of the adhesive 3 applied to the lens 11 is
If the viscosity of the adhesive 3 and the shape of the coating shaft 7 are the same, it is determined by the speed and distance until the tip of the coating shaft 7 to which a predetermined amount of the adhesive 3 adheres contacts the lens 11. That is, when the coating shaft 7 dipped in the adhesive 3 is pulled up from the adhesive 3, the adhesive adheres to the tip of the coating shaft 7, but when the coating shaft 7 is pulled up from the adhesive 3, Part of the adhesive attached to the tip runs down from the tip of the shaft. However, after the coating shaft 7 is pulled up from the adhesive 3 and a certain period of time elapses, a certain amount of the adhesive remains attached to the tip of the coating shaft 7 and the adhesive does not flow down from the tip of the coating shaft 7. . This is because the adhesive is attached to the tip of the coating shaft 7 only by the surface tension.
The amount of adhesive that remains on the tip and adheres is the final amount of adhesive that can adhere to the tip of the coating shaft 7.

Here, the above-mentioned amount of adhesion is determined by the shape and area of the tip of the coating shaft 7 and the viscosity of the adhesive 3 as described above. It is constant. Originally, if the adhesive can be applied to the lens 11 after a certain period of time, the application amount of the adhesive can always be applied in a constant amount as described above. However, when the amount of adhesive that adheres to the tip of the coating shaft 7 becomes constant only by the surface tension, that is, when it takes time until the adhesive does not flow down from the tip of the coating shaft 7, the adhesive is applied to a large number of lenses. It takes a lot of time if you want to.

Therefore, conventionally, the amount of adhesive to be applied is balanced by taking into consideration the pulling speed of the application shaft 7 from the adhesive and the distance from the liquid surface of the adhesive to the adhesive application surface of the lens 11. Was set so as to be always constant with respect to the adhesive application surface of the lens 11, but in reality, as the adhesive was applied to a plurality of lenses, the amount of the adhesive 3 decreased, and The balance between the pulling speed of the coating shaft 7 from 3 and the distance from the liquid surface of the adhesive 3 to the adhesive coating surface of the lens 11 is lost, and the amount of adhesive applied to the lens is not constant.

However, according to the adhesive application device of this embodiment, when the liquid level of the adhesive 3 is lowered, the height of the floating ring 14 is also lowered accordingly, so that the adhesive of the lens 11 is moved from the liquid level. Since the distance to the coating surface can be made constant at all times, the balance between the pulling speed of the coating shaft 7 from the adhesive 3 and the distance from the liquid surface of the adhesive 3 to the adhesive coating surface is always constant. Therefore, it becomes easy to always keep the amount of adhesive applied to the lens constant.

As described above, in this embodiment, since the floating ring 14 floats in the adhesive 3, the distance between the liquid surface and the coated surface of the lens 11 is always kept constant regardless of the amount of the adhesive. The amount of application is stable because it drips.

[0022]

As described above, according to the adhesive coating device of the present invention, the lower surface of the lens is supported by the stopper member, so that the lens and the coating shaft can be reliably separated even if the separability is poor. This makes it possible to prevent the lens from being pulled into the case. Therefore, the pulled-in lens does not accumulate in the case and interferes with the coating arm without causing a malfunction, so that the coating operation can be stably performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of an adhesive application device according to the present invention.

FIG. 2 is a diagram showing Embodiment 1 of the adhesive application device according to the present invention.

FIG. 3 is a diagram showing a second embodiment of the adhesive application device according to the present invention.

FIG. 4 is a diagram showing a third embodiment of the adhesive application device according to the present invention.

FIG. 5 is a diagram showing a conventional adhesive application device.

[Explanation of symbols]

 1 Base Plate 2 Plate Heater 3 Adhesive 4 Case 5 Temperature Sensor 6 Temperature Controller 7 Application Axis 8 Application Arm 9 Drive Mechanism 10 Adsorption Pad 11 Lens 12 Stopper Cap 13 Screw Ring 14 Floating Ring

Claims (1)

[Claims] 1. A case for storing an adhesive, a coating arm vertically movable in the case, and a coating shaft having a lower end supported by the coating arm and an adhesive attachment surface at the upper end. An adhesive application device, comprising: a stopper member that abuts and supports a lens to be applied from a lower surface of the adhesive application device.