JPS62113726A - Mold releasing of pressed optical part - Google Patents

Abstract

PURPOSE:To readily release a pressed optical part from a mold without damaging an optical surface, by giving microvibration to release the optical part from the mold in releasing the pressed optical part formed by press forming from the mold. CONSTITUTION:An optical glass material 10 is placed on a carrying part 13 of a ring-shaped transferring member 12, carried in a heating furnace through an arm 14, softened while heating and then carried in a gap between a top and a bottom forces 15 and 16 of a mold 11. The material 10 is then press formed by the top and bottom forces 15 and 16 to produce a pressed lens (10a). The bottom force 16 is then moved through a minute distance in the downward direction and stopped. A mold releasing member 18 is then moved in the direction of arrow 19 while being subjected to microvibration to bring the tip part thereof into contact with the outer periphery of an excess thickness part (10b) of the pressed lens (10a). Microvibration is given to the pressed lens (10a) to apply mold releasing force thereto and the pressed lens (10a) is surely released from the top force 15 without excessive strain and placed on the bottom force 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for releasing a press optical component formed by press molding from a mold.

[Prior Art] Generally, as a means for forming an optical glass material by press molding, a method as shown in FIG. 4 is adopted. That is, in this method, an optical glass material 4 subjected to heating and softening treatment is supplied into a lower mold 3 composed of an old mold 1 and a Φ child 2, and then the upper mold 5 is lowered to separate the upper mold 5 and the lower mold 4. The optical glass material 4 is pressed by the pressing surfaces (expansion surfaces) 5a and 2a.
is molded into a desired shape.

When releasing the press-formed product (press optical component) after molding, first raise the upper part 55, then lift the push-up rod 6.
The core 2 is moved through the .

Then, the press molded product is moved upward to a position higher than the upper surface of the body 51, and the molded product is scraped out using a scraping arm, a pinching method is used to pinch and take out the molded product, and suction is performed using a vacuum suction device. The molded product is taken out by a suction method in which the molded product is held, a blowing method in which the molded product is blown away through compressed air, or a lower mold inversion method in which the lower mold 3 is reversed to take out the molded product.

[Problems to be Solved by the Invention] A molded product molded and released by the above method can usually be used as an optical component (optical element) without further processing. In the technology, it has not been possible to release an optical component that can be used as an optical component as it is because the mold release method has the following problems. That is, when the optical glass material 4 that has been softened by heating is press-molded through the molds 3 and 5, the molded product is formed on the molding surface 2 of each of the molds 3 and 5 after molding.
A, 5a are usually joined to a so-called optical contact type FF. This bonding force is relatively strong, and therefore, the g15 method by wide scraping, Qi
The conventional female mold method employs the gI type method by scraping out, the RA method by wide suction, the RA method to create a female mold by simply blowing it away, and the mold release method to release the mold by simply inverting the lower mold 3. However, it has been extremely difficult to release the molded product easily and without damaging the effective diameter of the optical molding surface of the molded product.

The present invention has been made in view of the problems of the prior art described above, and is a method for releasing a pressed optical component by which a molded product can be easily released from the mold without damaging the optical molding surface after press molding. The purpose is to provide

[Means and effects for solving the problems] The present invention provides for transporting an optical glass material subjected to heat softening treatment between upper and lower molds via a conveying stage, and transporting the optical glass material through the lower mold. was press-molded into the shape of 9 mm, and then,
By changing the microvibration to the part outside the effective diameter of the press-molded optical component that is attached to one of the lower molds when the mold is moved and releasing the mold, it is easy to release the mold and the optical part of the molded product is This allows for female molding without damaging the effective diameter of the molding surface.

[Example] Hereinafter, an example of the present invention will be described in detail using the drawings.

(First Example) FIGS. 1(a) and 1(b) show a method for forming an optical glass material LO into a press optical component (the figure shows a press lens as an example, hereinafter referred to as a press lens) loa. Diagram (C)
The press-molded press lens loa is placed in the mold 11.
Shows how to make a female mold from.

First, using FIGS. 1(a) and (b), optical glass material 1
The molding device i and the molding force υ of 0 will be explained. An optical glass material 10, which is a molded object, is transported by a ring-shaped conveying member 1.
2, the conveying member 12 and the optical glass material 10 are placed on the glass material mounting portion 13 of 1 digit, and the arm 14 is driven to move in the left and right direction by a drive device (not shown). It is designed to be moved left and right through the handle.

Further, the optical glass material 10 is configured to be carried into a heating furnace (not shown) via an arm 14,
Optical glass material 10 subjected to heat softening treatment via a heating furnace
The upper mold 15 and lower mold 16 of the mold 11 are connected via the arm 14.
It is configured so that it can be transported between the two. Upper mold 15
The lower die 16 and the lower die 16 are disposed opposite to each other on the same axis, and are driven to move in the upper direction by a drive device (not shown) so that the press molding operation can be performed at zero position. Also, each has a molding surface 15a of a 10" shape 15.16.

16a is formed into a desired shape so that the optical glass material 1o can be formed into a desired shape, and each molding surface 1
5a and 16a are mirror finished. 17 is a hole in the upper type 16rftΦ river.

In the case of molding with the following configuration, first, the arm 14 is driven to carry the optical glass material 10 into the heating furnace, and the optical glass material 10 is heated and softened.
O is carried between the upper and lower molds 15 and 16 via the arm 14 (see FIG. 1(a)). Then, as shown in FIG. 1(b), the optical glass material IO is inserted through the upper and lower molds 15 and 16.
is press-molded into a press lens 10a having a desired shape.

During this press molding, the lower die 16 penetrates into the hole 17 and lifts the optical glass material 10 from above the conveying member 12 to perform the press molding. is formed outside the effective diameter of the press lens IO.

Next, a method for releasing the press-molded press lens 10a from the mold 11 will be explained using FIG. 1(c).

When releasing the press lens 10a, first the lower mold 16
is moved downward by a minute amount as shown in Figure (C), and stopped at that order. In this state, in the press lens 10a, the lower mold 16 moves downward, so that the upper mold 15 and the lower mold 1
Figure 0 shows a state in which the press lens 10a is joined to the upper mold 15, but in this embodiment, the lower mold Since the mold can be released in the same way when the mold is bonded to the 16 side, the following description will be made with respect to the case where the mold is bonded to the upper mold 15.

Next, a release member is placed on the side t of the press lens 10a (its height is set so that it can be released even if the press lens 10a is attached to either the upper mold 15 or the lower mold 16). 18 is activated to release the press lens lOa from the upper mold 15. The mold release member 18 is configured to be vibrated and driven via a vibration device (not shown) such as an ultrasonic wave or a vibrator, and is moved in the left and right direction via a moving drive device 21 (not shown), that is, in a press. It is designed to be moved in a direction 19 perpendicular to the molding direction. The vibration direction of the mold release member 1B is set in the same manner as the movement direction 19. When releasing the press lens loa using the mold release member 18, the mold release member 18 is moved in the direction of the arrow 19 while being slightly vibrated in the direction of the arrow 19.
The tip of the press lens lOa is brought into contact with the outer periphery of the extra thickness tob. Due to the contact of the mold release member 18 that vibrates minutely in the direction of arrow 19, a mold release force due to vibration acts on the press lens 10a in a direction perpendicular to the bonding force direction, and the press lens l
The oa is easily and reliably released from the L-shape 15.

The released press lens lOa slightly moves and falls F, and is placed and supported on the molding surface 16a of the knife mold 16 waiting on the side. At this point, the mold release member 18 completes its role [1] and returns to its original position.

Finally, the lower die 16 is roughly driven, and the press lens 1
The mold release operation is completed by placing Oa on the conveying member 12 and L and returning it to the position before the start of molding.

2. According to the mold release method of this embodiment, the following effects can be achieved.

(1) A minute displacement from the outer periphery of the press lens 10a
.

Since the press lens lOa is released from the mold after pressing, the effective diameter lens surface of the press lens lOa is not damaged.

(Because the mold is released using minute vibrations, excessive force is not applied to the press lens lOa during mold release, and the press lens lOa is not deformed. Therefore, a high-precision lens surface can be created. A press lens loa can be molded with a press lens loa.

(Second Embodiment) FIG. 2 shows a second embodiment of the mold release method according to the present invention.The feature of this embodiment is that the first embodiment is different from the side of the press lens loa. Direction 1 perpendicular to the molding direction from
9 is released from the mold by applying vibration, whereas press lens 1
0a 1- Molding direction and rolling direction (turning direction) 2 from below
The point is to release the mold by applying vibration to zero. That is, in this embodiment, a cylindrical (or annular) release ring 21 and a release ring 22 are attached to the outer peripheries of the upper and lower molds 15 and 16 for the corresponding upper and lower molds 15 and 16, respectively. The release rings 21 and 22 are fitted so that they can move up and down, and the upper mold release member 2
3. It is fixedly installed at each tip of the F-type mold release member 24. Each of the mold release members 23 and 24 is driven by a driving device (not shown) to move in the vertical direction, that is, in a direction 20 parallel to the molding direction.
], and is configured so that it can be vibrated in the vertical direction 20 via a vibrating device (not shown) such as an ultrasonic device or a vibrator. Therefore, according to this embodiment, the upper lII&! 1 ring 21 is brought into contact with the L mold release ring 21 in the vertical direction 20.
By vibrating the press lens tOa, the press lens tOa can be released from the upper mold 15 by applying a mold release force due to the vibration in the vertical direction 20. Even when the press lens 10a is attached to the lower mold 16 side, the lower mold release ring 22. Operate the lower mold release member 24 (Kaku! 4!
I) It is a material that can be removed from the mold.

The molding method and other functions are the same as those of the first embodiment, so the explanation thereof will be omitted.

According to the method of the present embodiment, in addition to the effects of the first embodiment, it is possible to apply an equal pressure mold release force to the entire outer circumference of the press lens 10a.
There is no need to pry the effective surface of the OA, which has the advantage of more reliably preventing damage.

(Third Embodiment) Figures 3(a') and 3(b) show a third embodiment of the mold release method according to the present invention. When applying vibration to the flesh portion lOb, a mold release force due to the vibration is applied to the extra meat portion 10b via the elastic members 25 and 26, and l! The point is to make it ll type. Note that FIG. 3(a) shows an example when applied to the first example, and FIG. 3(b) shows an example when applied to the second example. The elastic members 25, 26 are provided at the contact portions of the mold release members 18, 1llffi ring 21, 22 with the press lens 10a. It may be constructed using a soft metal such as steel, aluminum, or brass, or cast iron.The forming method and other functions are the same as those in the first or second embodiment, so a description thereof will be omitted. .

According to the method of the present embodiment described above, 1. In addition to the effects of the second embodiment, there is an advantage that damage and chipping of the lens contact portion during the mold release operation can be prevented.

[Effects of the Invention] As described above, according to the present invention, the optical components (optical elements) attached to the mold after press molding can be released from the mold without damaging the optical surface, and the press molded optical Uruchino aims to improve the quality of parts.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (c) are explanatory diagrams of an apparatus for carrying out a first embodiment of the method according to the present invention, and FIG. 2 is a diagram showing a second embodiment of the method according to the present invention. FIG. 3(A) is an explanatory diagram of an apparatus for implementing the example. (b) is an explanatory diagram of an apparatus for carrying out the third embodiment of the method according to the present invention, and FIG. 4 is an explanatory diagram showing a conventional mold release stage. 10... Optical glass material lGa... Press lens 15... Upper die 16... Lower die 18... Mold release member 21. 22... Mold release ring patent applicant Olympus Optical Industry Co., Ltd. No. 1 (a) (c) (b) 10, optical glass material 10a, press lens 15, upper mold 16, lower mold 18, mold release member 21.22. Mold release ring Figure 2 Model completed by Yamasho (spontaneous) January 29, 1985 Director General of the Patent Office Mr. Michibu Uga Pa'1, Indication of the case 1985 Patent Application No. 253393 2, Invention Name: Mold release method for pressed optical components 3, Relationship with the case of the person making the amendment Patent application Person: 2-43-2, Habagaya, Shibuya-ku, Tokyo 4゜Administrator 6: Contents of the amendment tl ) "Mold release method by wide scraping" described in page 4, line 7 L of the specification is deleted. (2) The first line of page 6 of the specification is amended as follows. A plurality of ring-shaped conveying members 12 are placed in a magazine with optical glass materials 10 as objects to be formed, and this magazine is conveyed to the vicinity of the heating lamp.
The optical glass material 10, which is the object to be molded, is phosphorus.3) Lines 4 to 6 of page 6 of the specification are corrected as follows. The base material 10 is placed on an arm 14 that is driven to move in the left-right direction by a drive device (not shown), and is operated to move in the left-right direction by a transfer means (not shown). The outer circumferential surface of the conveying member 12 forms an inclined surface that is open toward the top, and the arm 14
The optical glass material 1O is fitted into the inclined hole opened in the press molding position, and placed so that the optical glass material 1O is in a normal position. ”

Claims (4)

[Claims] (1) A heat-softened optical glass material is carried between upper and lower molds via a conveying means, the optical glass material is press-molded into a desired shape through the upper and lower molds, and then when the mold is moved, the optical glass material is A mold release method for pressed optical components that applies minute vibrations to a portion outside the effective diameter of a press-molded optical component that is attached to either the upper or lower mold to release the mold. (2) A patent characterized in that the part of the optical component outside the effective diameter is released from the mold by applying minute vibrations to the optical component in a direction perpendicular to the direction in which the bonding force acts on the optical component. A method for releasing a pressed optical component according to claim 1. (3) A patent claim characterized in that the part of the optical component outside the effective diameter is released from the mold by applying minute vibrations to the optical component in the same direction as the direction in which the bonding force is applied. A method for releasing a pressed optical component according to item 1. (4) The microvibration is applied to the portion outside the effective diameter of the optical component by bringing a member having a lower hardness than the optical glass material into contact with the portion outside the effective diameter. A method for releasing a pressed optical component according to item 1, item 2, or item 3.