JPH07234301A - Lens holding device for dip coat - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a basket that does not allow liquid pool in the lens when dipping the lens in hard coat liquid. In a lens holding device for a dip coat, which supports a peripheral edge portion of a circular lens, which is immersed in a liquid with an optical axis oriented in a substantially horizontal direction, at three places, a lower portion and a left and right sides, the left and right supporting portions are A pair of support arms having spring properties urged in a direction in which their free ends approach each other; and a line formed in the tips of the pair of support arms in a direction parallel to the lens optical axis with respect to the edge surface of the lens. A lens holding device for dip coating, comprising: a plate-shaped portion having a linear contact portion that contacts in a circular shape.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lens holding device for dip coating used when a circular optical lens such as a spectacle lens is immersed in a liquid such as a hard coating liquid.

[0002]

2. Description of the Related Art A lens holding device of this type generally comprises a basket provided with a large number of lens supporting portions, and each lens supporting portion has a peripheral edge surface of each circular lens at the lower side and at the left and right sides, respectively. Support with 3 points. The entire basket is immersed in the hard coat liquid and then pulled up, so that the lens surface is coated with the hard coat liquid.

In such a lens holding device, a liquid pool is likely to occur at the contact point between the lens and the lens support. This liquid pool not only has a poor appearance but also reduces the effective diameter of the lens if it forms on the lens surface.

Conventionally, in order to prevent the occurrence of this liquid pool, it has been attempted to bring the contact point between the lens and the lens support as close to the point as possible. Certainly, by making the contacts point-shaped and pressing the peripheral edge surface of the lens, it is possible to prevent the occurrence of liquid pools, but the support with point-shaped contacts causes a big problem in workability of attaching and detaching the lens. Had.

On the other hand, the lower and left and right supports are Y-shaped, and the supports that support the peripheral edges of the lens at three points at the front and back corners respectively have good workability of mounting, but are not compatible with the lenses. However, there is a problem that liquid pools are likely to occur at the contact portion of the.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dip coat lens supporting device which is excellent in workability for attaching and detaching a lens and which is less likely to cause liquid pool.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a contact portion between a lens and a supporting portion is formed in a linear shape instead of a dot shape, and in particular, a new proposal is made for a structure of a lower supporting portion, and a chamfered shape on the lens side is set. The main content is to make it difficult to collect liquid.

First, it is ideal that the contact portion between the lens and the lens support portion is in a dot shape, but the present inventors can effectively make a liquid pool even when the lens surface is linearly contacted with the edge surface. I found that it can be prevented. That is, the present invention is a dip coat lens holding device for supporting a peripheral edge portion of a circular lens, which is immersed in a liquid with its optical axis oriented in a substantially horizontal direction, at three places, a lower portion and left and right portions, and a left and right supporting portion. And a pair of support arms having a spring property urged in a direction in which the free end portions approach each other; a direction parallel to the lens optical axis with respect to the edge surface of the lens formed at the front end portions of the pair of support arms. And a plate-shaped portion having a linear contact portion that linearly contacts with the. The linear contact portion with the lens edge surface may be a completely straight line, but may be formed in a micro saw tooth shape or a comb tooth shape in order to prevent sliding with the lens.

Alternatively, the present invention focuses on the supporting structure of the lower part of the lens, and in the lens holding device for dip coating, which supports the peripheral edge surface of the circular lens immersed in the liquid at the lower part and the left and right three positions, It is characterized in that the lower support portion is composed of a plate-like body having a linear contact portion that linearly contacts the lens edge surface. It is practical to provide a plurality of linear contact portions for a plurality of lenses on this plate-shaped body, and in this case, a ridge is provided between each linear contact portion so that adjacent lenses do not move. Is preferred.

The present invention also provides another proposal for the lower support. That is, the lower support portion is composed of a plate-shaped body whose plate thickness plane is oriented in the vertical direction including the optical axis, and an apex portion abutting the edge surface of the lens at the upper edge of the plate-shaped body; A non-contact slope descending toward the convex side of the lens so as not to contact the edge surface of the lens; a flank descending from the apex toward the concave side of the lens; rising from the flank to the concave side of the lens And an inclined support surface that abuts against the edge of the concave surface of the lens.

In this apparatus, when the end surface edge portion of the lens on the concave surface side is chamfered in a direction substantially orthogonal to the lens optical axis, the end surface edge portion of the lens on the concave surface side contacts with the inclined support surface. The corners can be made large and the liquid pool can be more effectively prevented.

Further, in this apparatus, it is preferable that the left and right supporting portions of the lens are provided at positions where the convex surface of the lens is tilted upward when the lens is supported by the lower supporting portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. 1 to 3 show a first embodiment of the present invention. The lens basket 10 is provided with a lens holding device 11 which is the subject of the present invention in a row. Each lens holding device 11 is composed of a pair of left and right lens support arms 12 and a lower lens support rail (plate-shaped body) 13. The lens support arm 12 is made of a leaf spring material, and is provided with elasticity in a direction in which the free ends of the pair of lens support arms 12 approach each other. Is formed with a plate-shaped portion 14 extending in the thickness direction. The inner end of the plate-shaped portion 14 forms a linear contact portion 15 that linearly contacts the edge surface (peripheral surface) 21 of the lens 20 in a direction parallel to the lens optical axis.

The pair of lens support arms 12 support the lens 20 between them by its own elasticity, and when the lens 20 is inserted and removed, the lens support arms 12 are expanded against the elasticity. Then, the linear contact portion 15 has the lens 20.
When the lens 20 is in contact with the edge surface 21 of the lens 20, the plate-shaped portion 14 is shaped so that the side away from the lens 20 is sufficiently lower than the horizontal plane, as shown in FIG. That is, the angle α formed by the plate-shaped portion 14 and the tangent to the edge surface 21 of the lens 20 is sufficiently larger than 90 °, for example, 10 °.
It is set to about 0 to 150 °. Fall prevention claws 16 that prevent the lens 20 from falling are integrally provided at both ends of the linear contact portion 15 in the front-rear direction. It is desirable that the fall prevention claw 16 be formed so that the contact angle β becomes large when the lens 20 approaches. The length of the linear contact portion 15 is the thickness of the edge surface 21 of the lens +10 mm
It should be before and after.

The lens support rail 13 for supporting the center of the lower portion of the lens 20 is provided with a plurality of linear contact portions 17 that linearly contact in the direction parallel to the lens optical axis similarly to the edge surface 21 of the lens 20, and are adjacent to each other. A ridge 18 is formed between the mating linear contact portions 17. The length of the linear contact portion 17 is about +10 mm of the thickness of the lens 20 so that the insertion work is easy and a large tilt does not occur. Further, the height of the raised portion 18 is determined so that the lens 20 does not easily move to the adjacent linear contact portion 17 when vibration or the like is applied to the lens basket 10. The raised portion 18 may be a circular arc surface or a sloped surface. The pair of lens support arms 12 includes the linear contact portions 1
7, one lens holding device 1 is provided corresponding to
Make up one. Lens support arm 12 and rail 1
The plate thickness of 3 is about 0.05 to 3 mm, preferably 0.05
It should be ~ 1mm.

The above-mentioned lens basket 10 has a linear contact portion 17 of the lens support rail 13 of each lens holding device 11.
The lens 20 is placed on top of the pair of lens support arms 12
The lens 20 is sandwiched between and set. In this set state, the entire lens basket 10 is dipped in the hard coat liquid and pulled up after a predetermined time. Then, the hard coat liquid adhering to the lens 20 and the lens holding device 11 falls by its own weight, but the liquid propagating on the upper portion of the edge surface 21 is guided from the linear contact portion 15 onto the plate portion 14 and falls. To do. Therefore, no liquid pool can be formed on the edge surface 21. It was also confirmed that the liquid pool could not be formed just below the linear contact portion 15. It is considered that this is because the hard coat liquid can be favorably flown by bringing the surface into contact with the side surface of the edge surface 21. Similarly, with respect to the linear contact portion 17 of the lens support rail 13, the hard coat liquid that has propagated below the edge surface 21 has the linear contact portion 1.
7 flows down along the vertical surface of the support rail 13,
I can't collect liquid.

The linear contact portion 15 of the plate portion 14 of the above embodiment.
Has a high effect of preventing liquid pool, but the lens 20 easily slips. FIG. 4 shows that the linear contact portion 15 has a non-slip micro saw tooth 1
5'is an example in which 5'is formed. According to experiments, the pitch of the fine saw teeth 15 'is 2 mm or less and the depth thereof is 10 mm or less, preferably 5 mm or less. If the concave portion due to the minute sawteeth 15 'is large, the dip liquid will form a film in the concave portion,
For this reason, it causes liquid splash. Furthermore, the teeth may be comb-shaped instead of the minute saw teeth.

Next, FIG. 5 shows another embodiment of the present invention. This embodiment relates to a support structure in the lower center of the edge surface 21 of the lens 20. On the lens support rail 13,
An apex portion 31 that contacts the edge surface 21 of the lens 20, a non-contact slope 32 that descends from the apex portion 31 toward the convex surface (first surface) 22 side of the lens 20, and a concave surface of the lens 20 from the apex portion 31 ( 2nd surface) flank 3 descending toward the 23 side
3, the inclined support surface 34 that rises from the flank 33 to the concave surface 23 side of the lens 20, the connection inclined wall 35 that connects the apex of the adjacent inclined support surface 34 and the lower end of the non-contact inclined surface 32.
A lower support portion 30 is formed with the units and as one unit. The non-contact slope 32 and the connection slope wall 35 prevent the end edge portion of the convex surface 22 of the lens 20 from coming into contact with the lens support rail 13. The inclined support surface 34 is in contact with the end surface edge portion of the lens 20 on the concave surface 23 side and supports the lens 20 at two points together with the apex portion 31.

Inclination angle γ of the inclined support surface 34 from the horizontal direction
When the lens 20 is set, the
It is preferable that the angle be 30 ° or more so that it can slip easily in one direction.
The inclination angle δ of the non-contact slope 32 from the horizontal direction is 10
When it is at least 0 °, the contact angle between the non-contact slant surface 32 and the edge surface 21 can be increased to prevent liquid pooling. The depth y of the flank 33 is determined so that the convex surface 22 does not contact the flank 33 even when the lens 20 is thin.

On the other hand, in the lens 20, in order to increase the contact angle with the inclined support surface 34, a chamfer 23c in a direction substantially orthogonal to the optical axis of the lens is formed at the end surface edge portion on the concave surface 23 side.
Has been applied. The conventional chamfer 23c ′ has an angle opened from the direction orthogonal to the lens optical axis, as shown by the chain line, but with this chamfer, the contact angle with the inclined support surface 34 becomes small. On the other hand, as described above, the concave surface 23
If chamfering 23c in a direction substantially orthogonal to the lens optical axis is applied to the edge portion on the side, the contact angle becomes large, and the possibility of liquid pooling decreases. FIG. 6 shows chamfers 22c and 2
The example of the shape of the lens 20 which gave 3c is shown.

Similarly, it is preferable to chamfer 22c also on the edge portion of the end surface of the lens 20 on the convex surface 22 side. As shown in FIG. 7, this chamfer 22c particularly increases the contact angle with the linear contact portion 15 of the lens support arm 12, and if the contact angle increases, liquid pooling is also unlikely to occur.

The lens support arm 12 for supporting the left and right sides of the lens 20 is preferably provided at a position where the convex surface 22 of the lens 20 is tilted upward when the lens 20 is supported by the lower support portion 30. This rearward inclination angle θ (FIG. 5) is 0 ° to 45 °, preferably 5 °, when the optical axis of the lens 20 is oriented horizontally.
It is preferable that the angle is -25 °. Lens less than 0 °
The hard coat liquid attached to the edge surface 21 of 0 easily flows to the convex surface 22, the thickness of the hard coat film formed on the convex surface 22 becomes nonuniform, and the difference from the thickness on the concave surface 23 side becomes large. If it exceeds 45 °, the difference in film thickness between the hard coat film on the convex surface 22 side and the concave surface 23 side becomes large, as in the case of less than 30 ° of the lower support portion. By inclining the lens 20 in this manner, the film thickness of the hard coat film can be made uniform, and even if a liquid pool is formed, it can be formed on the concave surface 23 side that is inconspicuous.

[0023]

As described above, according to the present invention, it is possible to obtain the lens holding device in which the liquid is unlikely to pool in the lens when the circular lens is dipped in the liquid such as the hard coat liquid.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a lens holding device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a side view of the lower support rail of FIG.

FIG. 4 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 5 is a side view of the lower rail showing another embodiment of the lens lifting device of the present invention.

FIG. 6 is a diagram illustrating chamfering performed on a circular lens.

FIG. 7 is a diagram for explaining the effect of the chamfer in FIG.

[Explanation of symbols]

 10 Lens Basket 11 Lens Holding Device 12 Lens Support Arm 13 Lens Support Rail (Plate Body) 14 Plate Part 15 Linear Contact Part (Left and Right) 17 Linear Contact Part (Lower Part) 18 Raised Part 20 Lens 21 Edge Surface 22 Convex Surface (1st surface) 23 Concave surface (2nd surface) 22c 23c Chamfer 30 Apex part 31 Apex part 32 Non-contact slant surface 33 Flank surface 34 Inclined support surface 35 Connection inclined wall

Claims (7)

[Claims] 1. A dip-coat lens holding device for supporting a peripheral edge portion of a circular lens, which is immersed in a liquid with its optical axis oriented substantially horizontally, at a lower portion and at three places on the left and right sides. A pair of support arms having a spring property urged in a direction in which the free end portions approach each other; a part parallel to the lens optical axis with respect to the edge surface of the lens formed at the front end portions of the pair of support arms. A lens holding device for dip coat, comprising: a plate-shaped portion having a linear contact portion that linearly contacts in a direction. 2. The lens holding device according to claim 1, wherein the linear contact portion with the lens edge surface has a minute sawtooth shape. 3. A dip coat lens holding device for supporting a peripheral edge portion of a circular lens, which is immersed in a liquid with its optical axis oriented in a substantially horizontal direction, at a lower portion and at three places on the left and right sides. Is a lens holding device for dip coating, which is composed of a plate-shaped body having a linear contact portion that linearly contacts the lens edge surface in a direction parallel to the optical axis. 4. The lens holding device according to claim 3, wherein the plate-shaped body is provided with a plurality of linear contact portions for a plurality of lenses, and a ridge is provided between the linear contact portions. 5. A lens holding device for dip coating, which supports a peripheral edge portion of a circular lens, which is immersed in a liquid with its optical axis oriented in a substantially horizontal direction, at a lower portion and at three places on the left and right sides, wherein the lower supporting portion is provided. Consists of a plate-shaped body whose plate thickness plane is oriented in the vertical direction including the optical axis, and an apex portion that abuts the edge surface of the lens at the upper edge of the plate-shaped body; A non-contact slope that descends so as not to contact the edge surface of the lens; a flank that descends from the apex toward the concave surface of the lens;
A lens holding device for dip coating, in which an inclined support surface that rises from this flank to the concave surface side of the lens and contacts the edge portion of the concave surface side of the lens is formed. 6. The lens holding device for a dip coat according to claim 5, wherein the end surface edge portion on the concave surface side of the lens is chamfered in a direction substantially orthogonal to the lens optical axis. 7. The lens holding device according to claim 5, wherein the left and right support portions of the lens are provided at positions where the convex surface of the lens is inclined upward when the lens is supported by the lower support portion. apparatus.