JPH0729224A - Optical disk molding method and molding apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] To control the peeled state of a molded product immediately after molding, judge whether the molded product is good or bad, and maintain the peeled state constant so that the defective state does not continue. [Structure] When the substrate molded by the molding machine 1 is air-peeled from the fixed-side and movable-side dies 2 and 3, the air-blowing blow-out timing is fixed-side peeling air-blowing flow sensor 4 and movable-side peeling air-blowing flow sensor 5. This is detected by the air blow timing detection device 7 from the output signal of.
From this, the difference between the timing values of the fixed-side separation air blow-out and the movable-side air blow-out is output as a signal to the first arithmetic unit 9 as a delay time. In the first arithmetic unit 9, the normal substrate peeling delay time input in advance by the first setting input device 11 is compared with the above-mentioned delay time, and if the product is a good product, it is stored in the good product stocker 15.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical disk molding method and a molding apparatus, and more particularly to an optical disk molding method and a molding apparatus for managing the quality of a molded product in molding an optical disk.

[0002]

2. Description of the Related Art In molding an optical disk, air is used to separate a molded substrate from a stamper. Depending on the peeling at the time of this air peeling, the pit shape of the stamper is not transferred as it is, and abnormal transfer may occur.
2 (a) and 2 (b) are views showing normal and abnormal pit shapes. FIG. 2 (a) is a pit shape of a substrate normally peeled from a stamper by air blow, and FIG. 2 (b) is a stamper by air blow. The pit shapes of the substrates that have not been normally peeled from FIG. When performing continuous molding of an optical disk substrate, since the operation of the molding machine or the operations of peripheral equipment of the molding machine has variations, the state in which the molding substrate is separated from the stamper by air blow varies. As a result, the state of normal peeling changes to a peeled state that causes abnormal transfer, resulting in a defective product. The molding is continuously performed regardless of the normal separation of the substrate by air blow. For this reason, substrates in which good products and defective products are mixed are produced, and 100% inspection is required in the subsequent process. As described above, in the current molding, it is necessary to inspect for good products and defective products after the molding, and it is extremely inefficient. Further, when defective products are continuously generated, there is a problem that the product does not flow in the subsequent process.

[0003]

[Purpose] The present invention has been made in view of the above-mentioned circumstances, and manages the peeling state of a molded article immediately after molding to judge whether the molded article is good or defective, and peels it so that the defective state does not continue. The object of the present invention is to provide an optical disk molding method and a molding apparatus capable of maintaining a constant state.

[0004]

In order to achieve the above object, the present invention provides (1)
In the optical disk molding method using the injection molding method, the separation air blow timing of the fixed side mold and the movable side mold during the molding process is detected, and the substrate separation state during the molding process is managed, or ( 2) In the optical disk molding method using the injection molding method, the air blow flow rate value of the peeling air blow of the fixed side mold and the movable side mold during the molding process is detected, and the blowout timing is detected, and the substrate during the molding process is detected. Management of peeling state, or (3)
In an optical disk molding apparatus using an injection molding method, a flow rate sensor is provided immediately before each of the fixed side mold and the movable side mold of the peeling air blow pipe to be piped to the mold, and further, (4) above ( In 3), it is the difference between the detection means for detecting the peeling air blow blow timing value of the fixed side mold and the movable side mold from the output signal of the peeling air blow flow rate sensor, and the timing value detected by the detecting means. Comparing the delay time with the normal peeling delay time of the substrate, and having a determining means for determining the quality of the substrate for each shot, performing the storage or disposal processing of the good or defective substrate, further, (5) In (3) or (4) above, a detection is performed based on the output signal of the peeling air blow flow rate sensor to detect the flow rate value at the end of the peeling air blow of the movable side mold of the fixed side mold. Means, a comparing means for comparing the flow rate value detected by the detecting means with a normal substrate peeling flow rate value, and a determining means for determining the quality of the substrate for each shot, and storing the non-defective or defective product substrate. Alternatively, a disposal process may be performed. Further, in (6) above (3) or (4), when a defective substrate is generated during the continuous molding, a peeling air blow is performed to adjust the delay time to the normal substrate peeling delay time. Having a control means for controlling the setting of the pressure and the blowing timing, and (7) In (3) or (5) above, when a defective substrate occurs during continuous molding, the flow rate at the end of peeling air blowing. Control the setting of the pressure and flow rate of the peeling air blow so as to match the value to the normal peeling flow rate value of the substrate, and (8) in (6) above, the normal substrate peeling delay time is set to the stamper / die / molding strip. Variably set each time, and (9) in (7), the normal substrate peeling flow rate value is variably set each time the stamper, mold, and molding conditions change, and (10) above. In (6) or (7), when the control function operates continuously, the operation of the molding machine is stopped, and a notification means is provided to inform which control function is in continuous operation. It is a thing. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of an optical disk molding apparatus according to the present invention. In the figure, 1 is a molding machine, 2 is a fixed mold, 3 is a movable mold, and 4 is a mold. Fixed side separation air blow flow rate sensor, 5 movable side separation air blow flow rate sensor, 6 air blow control device, 7 air blow timing detection device, 8 air blow flow rate detection device, 9 first arithmetic device, 10 Is the second arithmetic unit, 11
Is a first setting input device, 12 is a second setting input device, 1
3 is a molding defect monitoring device, 14 is a substrate unloader, 15 is a non-defective product stocker, 16 is a defective product stocker, and 17 is an air source.

The operation of the present invention is performed when the molded substrate is peeled off. First, when the substrate molded by the molding machine 1 is air-peeled from the fixed side mold 2 and the movable mold 3, the air blow blowing timing is set to the fixed side peeling air blow flow rate sensor 4 and the movable side peeling air blow flow rate sensor 5. This is detected by the air blow timing detection device 7 from the output signal of.
From this, the difference between the timing values of the fixed side separation air blow blow and the movable side air blow blow is set as the delay time and output to the first arithmetic unit 9 as a signal. In the first arithmetic unit 9, the normal peeling delay time of the substrate previously input by the first setting input unit 11 is compared with the above-mentioned delay time, and if the comparison result is within ± 0.1 sec, it is determined as a good product. The defective products are stored in the non-defective product stocker 15, and the other products are regarded as defective products, and a signal is output from the molding defect monitoring device 13 to the board unloader 14 and stored in the defective product stocker 16.

Further, when a defect occurs, a signal is output to the air blow control device 6 as a peeling abnormality, and the air blow control device 6 controls the blowout timing of the air blow and the air blow pressure to cause the normal peeling delay time of the substrate. And the delay time difference is kept within ± 0.1 sec. However, when this control is continuously performed, that is, when defective products are
When about 20 shots continue, the molding failure monitoring device 13 outputs a molding stop signal to the molding machine 1, and
It is possible to notify the operator of an abnormality in the peeling air blow timing.

At the time of peeling in the molding process, the flow rate at the end of peeling air blow is detected by the air blow flow rate detecting device 8 from the output signals of the fixed side peeling air blow flow rate sensor 4 and the movable side peeling air blow flow rate sensor 5. To do.
The separation air blow flow rate value of the fixed side mold and the movable mold is output to the second arithmetic unit 10 as a signal. The second
In the arithmetic unit 10, the normal peeling flow rate value of the substrate previously input by the second setting input device 12 is compared with the peeling air blow flow rate value, and if the comparison result is within ± 5%, it is determined as a good product stocker. 15 to the substrate pick-up machine 1 from the defective molding monitoring device 13 as a defective product.
4 is output to the defective stocker 16 and stored in the defective stocker 16.

When a defect occurs, the air blow controller 6 controls the air blow pressure and flow rate as a peeling abnormality, and suppresses the difference between the normal substrate peeling flow rate value and the peeling air blow flow rate value within ± 57. . However, when this control is continuously performed, that is, when the defective products are continuous for about 10 to 20 shots, the molding failure monitoring device 13 is used as described above.
Outputs a signal for stopping the molding to the molding machine 1 and can notify the stopped worker of the abnormality of the peeling air blow flow rate.

Further, the defect determination by the molding defect monitoring device 13 is determined to be defective when either the first arithmetic device 9 or the second arithmetic device 10 is determined to be a peeling abnormality. Then, when continuous molding defects occur, the molding defect monitoring device 13 counts the above-mentioned two abnormal peeling air blow timings and abnormal peeling air blow flow rates, and the contents of the count (10 to 20 shots) can be shown to the operator. In addition, reset is applied when the number of shots is 10 or less. Further, the flow rate sensors 4 and 5 are installed immediately before the respective molds. In addition, the setting first and second input devices 11,
The normal substrate peeling delay time and the normal substrate peeling flow rate value, which are input to 12, are set and input by checking the normal substrate peeling condition every time the stamper, mold, and molding conditions are changed.

[0011]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1; The substrate peeling initial state can be monitored by detecting the peeling air blowing timing of the fixed side mold and the movable side mold. (2) Effect corresponding to claim 2; The substrate peeling completion state can be monitored by detecting the peeling air blow flow rate value of the fixed side mold and the movable side mold. (3) Effect corresponding to claim 3; Detecting a value close to the peeling air blow that actually peels the substrate by providing a flow rate sensor immediately before both molds of the air blow pipe to be piped to the mold. You can (4) Effects corresponding to claims 4 and 5: Since it is possible to determine the quality of the substrate by monitoring the initial state of substrate peeling and the state of completion of substrate peeling, it is not necessary to perform a 100% inspection for abnormal transfer in a subsequent process. (5) Effect corresponding to claim 6; The substrate peeling initial state can be normalized by controlling the setting of the peeling air blow pressure and the blowing timing. (6) Effect corresponding to the configuration 7; The substrate peeling completion state can be normalized by controlling the setting of the peeling air blow pressure and the flow rate. (7) Effects corresponding to the configurations 8 and 9; The normal substrate peeling delay time and the normal substrate peeling flow rate value can be variably set, so that the quality of the substrate can be determined even if the stamper, the mold, and the molding conditions are changed. (8) Effects corresponding to the configuration 10; when the molding defects are continuously generated frequently, the operation of the molding machine is stopped, and the defective molding can be stopped by notifying the operator of the contents of the molding defects. The person can assume an abnormal state at the time of peeling the substrate and can promptly respond.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of an optical disc molding apparatus according to the present invention.

FIG. 2 is a diagram showing normal and abnormal pit shapes by a conventional optical disk molding apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molding machine, 2 ... Fixed side mold, 3 ... Movable mold, 4 ... Fixed side peeling air blow flow rate sensor, 5 ... Movable side peeling air blow flow rate sensor, 6 ... Air blow control device, 7 ...
Air blow timing detection device, 8 ... Air blow flow rate detection device, 9 ... First arithmetic device, 10 ... Second arithmetic device, 11 ... First setting input device, 12 ... Second setting input device, 13 ... Molding defect monitoring device, 14 ... Substrate takeout machine, 1
5: Non-defective stocker, 16 ... Defective stocker, 17 ... Air source.

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[Procedure amendment]

[Submission date] September 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

When a defect occurs, the air blow controller 6 controls the pressure and flow rate of the air blow as a peeling abnormality, and keeps the difference between the normal peeling flow rate value of the substrate and the peeling air blow flow rate value within ± 5 % . suppress. However, when this control is continuously performed, that is, when the defective products are continuous for about 10 to 20 shots, the molding failure monitoring device 1 is performed as described above.
3 with the output signals of the molded stop to the molding machine 1, work
It is possible to notify the contractor of the abnormal flow rate of the peeling air blow.

Claims (6)

[Claims] 1. In an optical disk molding method using an injection molding method, a separation air blow timing of a fixed side mold and a movable side mold during a molding process is detected, and a substrate peeling state during the molding process is managed. An optical disk molding method characterized by the above. 2. An optical disk molding method using an injection molding method, which detects an air blow flow rate value of a peeling air blow of a fixed side mold and a movable side mold during a molding step, and also detects a blowout timing to perform the molding step. An optical disk molding method, characterized in that the peeling state of the inside substrate is controlled. 3. An optical disk molding apparatus using an injection molding method, wherein a flow rate sensor is provided immediately before each of the fixed side mold and the movable side mold of the peeling air blow pipe to be piped to the mold. Optical disk molding device. 4. A detecting means for detecting a peeling air blow-out timing value of a fixed side mold and a movable side mold from an output signal of the peeling air blow flow rate sensor, and a difference between the timing value detected by the detecting means. A comparison means for comparing a certain delay time with a normal peeling delay time of the substrate, and a judgment means for judging the quality of the substrate for each shot, and perform storage or disposal processing of a non-defective or defective substrate. The optical disk molding apparatus according to claim 3, wherein 5. A detection unit for detecting a flow rate value of the fixed side mold at the end of the peeling air blow of the movable side mold from an output signal of the peeling air blow flow rate sensor, and a flow rate value detected by the detection unit. 4. A storage unit for comparing or comparing a normal substrate separation flow rate value and a determination unit for determining the quality of a substrate for each shot, and storing or discarding a non-defective or defective substrate. Alternatively, the optical disc molding apparatus according to item 4. 6. A control means for controlling the setting of the pressure and the blowing timing of the peeling air blow so as to match the delay time with the normal peeling delay time of the substrate when a defective substrate occurs during the continuous molding. The optical disk molding apparatus according to claim 3 or 4.