JP3129024B2 - Mold for glass mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass mold for press-molding a glass lens.

[0002]

2. Description of the Related Art In recent years, the role of a glass molding method has become important in lens processing in response to the demand for smaller, lighter, and lower cost video cameras.

[0003] A conventional glass mold will be described below. FIG. 2 is a sectional view showing the structure of a conventional glass mold. In FIG. 2, reference numeral 3 denotes a drum mold (A), in which an upper punch 1 and a lower punch 2 are inserted, and a drum mold (B) 3 is provided on the outside. A sputtered film is deposited on the convex spherical portion 1a. is there.

The operation of the glass mold having the above-described configuration will be described below. A preform glass material is placed on the upper punch 1, the lower punch 2 is inserted, the mold is heated, and the upper punch is movable and pressed, whereby a concave lens can be formed. The center thickness can be adjusted.

[0005]

However, in the above-mentioned conventional structure, as shown in FIG. 3, when the upper punch 1 is inserted, the convex spherical portion 1 is buffered at the entrance inside the body die (A) 3.
There is a problem in that chipping occurs in the edge 1b on the outer peripheral portion of a and the sputtered film comes off.

The present invention solves the above-mentioned conventional problems. When the upper punch 1 is inserted into the body mold (A) 3, it is possible to form a lens without damaging the mold by buffering. An object of the present invention is to provide a glass mold having a shape.

[0007]

In order to achieve this object, a glass mold according to the present invention comprises a cylindrical mold having a convex spherical surface provided on the upper and lower sides. It is possible to form a concave lens by pressing the mold, and a double barrel type structure further provided with a cylindrical barrel that adjusts the center thickness of the lens outside the barrel, and has a convex spherical surface. The step has a stepped shape whose diameter is smaller than the outer circumference, a chamfer is provided on the outer circumference of the stepped part, a chipping prevention means at the time of inserting a mold, and R is provided at an edge of the outer circumference of the convex spherical part, and the convex spherical part is provided. The structure has a function of preventing the deposited sputtered film from peeling off.

[0008]

With this structure, when the upper and lower punches are inserted into the body mold, the sputtered film can be prevented from peeling off due to chipping, and the life of the mold can be greatly improved without damaging the convex spherical surface. Loss can be reduced, long-term mass production becomes possible, and cost reduction can be achieved.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 7 denotes a drum mold (A), in which an upper punch 5 and a lower punch 6 are inserted, and a drum mold (B) 8 is provided on the outside, and a sputtered film is formed on the convex spherical portion 5a. Has been deposited. The convex spherical portion 5a has a stepped shape having a smaller diameter than the outer periphery, a chamfer 5b is provided on the outer periphery of the stepped portion, an R chamfer 5c is provided on an outer edge of the convex spherical portion, and an inner diameter of the body mold (A) 7 is provided. A clearance is provided in the outer diameter of the convex spherical portion.

The operation of the glass mold thus configured will be described below. A preform glass material is placed on the upper punch 5, the lower punch 6 is inserted, the mold is heated, and the upper punch is movable and pressed, whereby a concave lens can be formed. The center thickness can be adjusted.

As described above, according to this embodiment, it is possible to prevent the sputter film from peeling off due to chipping when the upper and lower punches are inserted into the body mold, and to reduce the life of the mold without damaging the convex spherical surface. Is greatly improved, the loss required for maintenance can be reduced, long-term mass production is possible, and cost reduction can be achieved.

Although the convex spherical mold is used in the embodiment, a convex spherical mold or an aspherical form may be used.

[0014]

As described above, according to the present invention, a concave lens is formed by inserting a mold having a cylindrical body mold provided with a convex spherical surface into upper and lower sides and pressing the upper mold. Is possible,
A stepped shape in which a convex spherical portion is smaller in diameter than an outer periphery in a glass mold mold having a double body structure in which a cylindrical body mold for adjusting the center thickness of a lens is further provided outside the body mold. Provided with a chamfer on the outer periphery of the stepped portion, means for preventing chipping when the mold is inserted, and R on the outer edge of the convex spherical portion to prevent the sputtered film deposited on the convex spherical portion from peeling off. As a result, the work can be performed smoothly, the life of the mold can be greatly improved without damaging the convex spherical surface, and the loss required for maintenance can be reduced.
It is possible to realize an excellent mold for glass molding that can be mass-produced for a long period of time and reduce costs.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view illustrating a configuration of a glass mold according to an embodiment of the present invention. FIG. 1B is an enlarged view of a convex spherical portion of the glass mold according to the embodiment.

FIG. 2 is a cross-sectional view of a configuration of a conventional glass mold.

FIG. 3 is a detailed view of chipping when a conventional upper punch is inserted.

[Explanation of symbols]

 Reference Signs List 5 Upper punch 5a Convex spherical surface 5b C chamfer 5c R chamfer 6 Lower punch 7 Body type (A) 8 Body type (B)

Claims (1)

(57) [Claims] 1. A concave lens is formed by inserting a mold provided with a convex spherical surface on a cylindrical body mold into upper and lower sides, and pressing the upper mold to form a concave lens. In a mold for a glass mold, which is a double body type structure further provided with a cylindrical body mold for adjusting the center thickness of the lens on the outside, a stepped shape in which the convex spherical portion has a smaller diameter than the outer periphery, and has a stepped shape. Chamfered on the outer periphery of the portion, means for preventing chipping when the mold is inserted, and R provided on the edge of the outer periphery of the convex spherical portion to prevent the sputtered film deposited on the convex spherical portion from peeling off. Mold for glass molding.