JP4065453B2 - Thin film stretcher using vacuum pressure - Google Patents

Description

The present invention relates to a thin film stretching apparatus, and more particularly to a thin film stretching apparatus capable of efficiently stretching a thin film using vacuum pressure.

  For acoustic equipment used in electronic products such as mobile phones, telephones, and digital cameras, a thin-film vibration film such as PET (Poly-Ethylene Terephthalate) film is used to convert vibration due to sound pressure into an electrical signal. Is used. Such a diaphragm must maintain an extended state because the sensitivity characteristic of the acoustic equipment is influenced by the tension value of the diaphragm. In particular, in the case of a small-sized microphone produced in large quantities, the sensitivity characteristic of the product must be maintained uniformly. For this purpose, a uniform tension value of the vibrating membrane must be ensured. However, in the conventional manufacturing process of a small microphone, a method of extending a thin film by applying a mechanical load to the thin film using a weight was used. Since such a method is greatly affected by external factors such as changes in the process environment, there is a problem that it is difficult to maintain a uniform tension value for each process. Due to such a problem, the deviation of the sensitivity characteristic of the product becomes severe, and the yield of the product is seriously reduced.

  The present invention is for solving the above-described problems, and it is possible to provide a uniform tension value by applying a vacuum pressure provided from a vacuum pump to a thin film through a vacuum suction portion installed in a base. The tension value of the thin film can be measured by applying the test sound pressure provided from the sound pressure generator to the thin film through a copper plate with a sound pressure application hole formed in the lower part of the base. An object of the present invention is to provide a thin film stretching apparatus using vacuum pressure that can automate a thin film stretching process for producing a vibrating film by using an upper plate mold that is coupled to the apparatus.

According to another embodiment of the present invention, the upper plate mold is coupled to the vertical movement device through the buffer member, thereby preventing the device and the thin film from being deteriorated due to the pressure shock when the upper plate mold is pressed. Another object is to provide a thin film stretching apparatus using vacuum pressure.
According to another embodiment of the present invention, the vertical movement device further includes an upper plate mold mounting means, and the upper plate mold mounting means is slid by the guide post and the ball bushing bearing, thereby improving the accuracy of the thin film extension process. Another object of the present invention is to provide a thin film stretching apparatus using vacuum pressure.

  According to another embodiment of the present invention, a thin film stretching apparatus using vacuum pressure is provided in which the accuracy of a clamping process is increased by moving an outer clamp up and down using two clamp cylinders. Another purpose is to do.

  According to still another embodiment of the present invention, it is also possible to provide a thin film stretching apparatus using vacuum pressure in which work efficiency is increased by continuously supplying a thin film to a thin film stretching apparatus through a roll feeding device. Another purpose.

  Finally, according to another embodiment of the present invention, the thin film using vacuum pressure can maintain the stretched state of the thin film by closely bonding the upper plate mold and the lower plate mold through the square five ring. Another object of the present invention is to provide a stretching apparatus.

  In order to achieve the above object, the thin film stretching apparatus using vacuum pressure according to the present invention has a lower plate mold insertion groove for inserting the lower plate mold formed on the upper surface, and the lower plate mold insertion groove described above. A vacuum suction part is formed around the base, and the bottom surface of the base is a base on which a sound pressure application hole is installed; vertically spaced from the top surface of the base and vertically moves with respect to the base An upper plate mold that is detachably attached to the end of the upper and lower transfer portion and moves vertically up and down with respect to the base to be coupled to the lower plate mold at the lowest point; the base and the above An outer clamp that is positioned between the upper and lower transfer parts and vertically moves with respect to the base to press the thin film positioned on the outer part of the lower plate mold at the lowest point; To provide a true vacuum A pump; and a sound pressure generator that provides a test sound pressure to the thin film through the sound pressure application hole attached to the bottom surface of the base, and includes the thin film on the upper surface of the lower plate mold. Is positioned, the outer clamp presses the outer shell portion of the thin film, the upper and lower transfer unit connects the upper plate mold with the lower plate mold inserted into the base, and the vacuum pump A vacuum state is provided to extend the thin film, and the sound pressure generating unit provides a test sound pressure to the extended thin film.

  As described above, according to the thin film stretching apparatus using vacuum pressure according to the present invention, a uniform tension can be obtained by applying the vacuum pressure provided from the vacuum pump to the thin film through the vacuum suction portion installed in the base. The tension value of the thin film can be measured by applying the test sound pressure provided from the sound pressure generator to the thin film through a copper plate with a sound pressure application hole formed in the lower part of the base. Using the upper plate mold coupled to the outer clamp and the vertical movement device, it provides a remarkable effect that the thin film stretching process for vibrating membrane production can be automated.

  On the other hand, according to another embodiment of the present invention, the upper plate mold is coupled to the vertical movement device through the buffer member, thereby preventing the deterioration of the device and the thin film due to the crimping impact when the upper plate mold is pressed. The vertical movement device further includes an upper plate mold mounting means, and the upper plate mold mounting means can be slid by the guide post and the ball bushing bearing to increase the accuracy of the thin film extension process; The accuracy of the clamping process can be improved by moving the outer clamp up and down using a clamp cylinder; the work efficiency is improved by continuously supplying the thin film to the thin film stretching device through the roll supply device. The upper and lower plate molds are brought into close contact with each other through a square and five ring, and the thin film is stretched. It provides another advantage of being able to lifting.

  The above and other objects and features and advantages of the present invention will become more apparent through the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 4 illustrate a thin film stretching apparatus according to an embodiment of the present invention. The thin film elongating apparatus includes a base (10), a vertical transfer unit (20), an upper plate mold (30), an outer clamp (40), a vacuum pump (60), and a sound pressure generating unit (70). . A lower plate mold insertion groove (12) for inserting the lower plate mold (32) is formed on the upper surface of the base (10), and a vacuum suction portion (62 in FIG. 4) is formed around the lower plate mold insertion groove (12). ) And a sound pressure applying hole is installed on the bottom surface of the base (10).

  The base 10 will be described in detail with reference to FIGS. 5 and 6 as follows. A sound pressure applying hole (74) corresponding to the inner area of the lower plate mold (32) or having a smaller area is installed at the center of the base (10). The sound pressure application hole (74) plays a role of transmitting a test sound pressure generated from a sound pressure generator (70 in FIG. 4), which will be described later, to the thin film (35 in FIG. 7). ) Is measured as follows. When a test sound pressure is applied to the thin film (35), a change in the distance between the sound pressure application hole and the thin film (35) occurs, and the tension value of the thin film (35) is measured through a change in capacitance due to this. According to the embodiment of the present invention, it is preferable that the sound pressure applying hole (74) is installed on a copper plate (72) separate from the base (10).

  The lower plate mold insertion groove (12) plays a role of accurately seating the lower plate mold (32 in FIG. 7) on the base (10) due to unevenness. On the other hand, a vacuum suction part (62) for extending the thin film (35 in FIG. 7) is formed around the lower plate mold insertion groove (12). The vacuum suction part (62) is preferably formed through the base (10) so as to be connected to the vacuum pump (60 in FIG. 4) as shown in FIG. More preferably, a contact ring (14) is provided around the vacuum suction part (62) as shown in FIG. 6 so that the thin film (35) can be stretched by vacuum pressure during outer clamping. .

  The vertical transfer part (20) is vertically spaced from the upper surface of the base (10), and moves vertically with respect to the base (10). The upper plate mold (30) is provided with the vertical transfer part (20). It is detachably attached to the end of the base plate, and moves vertically up and down with respect to the base (10) to join the lower plate mold (32) at the lowest point. The vertical transfer unit 20 serves to move the upper plate mold 30 downward and to be coupled to the lower plate mold 32. As shown in FIGS. It can be installed on the first support member (22) extended at the side and bent at the top.

  The vertical transfer unit 20 may be implemented using a hydraulic cylinder, a pneumatic cylinder, a motor device, or the like. More preferably, the vertical transfer unit 20 has at least a diameter in order to prevent occurrence of a press position error due to repetitive operations. It is preferable to use a cylinder having a diameter of 60 mm or more. On the other hand, it is preferable to further include an upper plate mold mounting means (34) at the end of the vertical transfer section (20) so that the upper plate mold (30) can be detachably attached. In order to prevent this, as shown in FIGS. 1 to 3, the upper part of the upper plate mounting means 34 further includes two guide posts 36, and includes a first support member 22. More preferably, each includes a ball bush bearing (38) at a position where the guide post (36) is slid.

  On the other hand, the upper plate mold 30 is illustrated in FIGS. 1 to 4 so that the pressure by the vertical transfer unit 20 is uniformly applied to the four edges of the upper plate mold 30. It is preferable that the upper and lower transfer parts (20) are coupled to each other through a buffer member (31) such as a spring that contacts the four edge portions of the upper plate mold.

  The outer clamp (40) is spaced apart from the base (10) and the vertical transfer part (20), but moves vertically up and down with respect to the base (10) so that the lower plate mold (32) can move at the lowest point. It plays the role of crimping the remaining thin film (35 in FIG. 7) located in the outer shell. In order for the outer clamp (40) to press fit the remaining thin film (35) more closely, it is preferable to perform the clamping operation using a plurality of clamp cylinders rather than using a single clamp cylinder. In the embodiment of FIGS. 1 to 4, the two second support members (42) extended at the rear side of the base (10) can be moved up and down by clamp cylinders (44) respectively installed. did.

  The vacuum pump 60 performs a function of providing a vacuum to a vacuum suction unit (62 in FIG. 6) through a vacuum line (not shown). The vacuum pressure generated from the vacuum pump (60) adsorbs the peripheral part of the thin film (35) located above the vacuum suction part (62) of the base (10), and makes the entire thin film stretched.

  The sound pressure generating part (70) is attached to the bottom surface of the base (10), and is formed on a thin film (35 in FIG. 7) that maintains an extended state through a sound pressure applying hole formed in a copper plate (72 in FIG. 4). Provides the test sound pressure and performs the function of allowing the tension value to be measured. On the other hand, in the embodiment of FIG. 4, an example in which the speaker 70 is directly attached to the bottom surface of the copper plate 72 is illustrated. However, a speaker is separately installed to form a sound pressure line, and a test sound pressure is obtained. The sound pressure generating part (70) can also be configured by applying to the thin film (35 in FIG. 7).

  According to the embodiment of the present invention, as shown in FIGS. 3 and 8, the roll supply unit 50 is installed on the rear surface of the base 10 and supplies the thin film 35 in a roll state. This increases the efficiency of thin film stretching work. In this case, the thin film can be cut automatically by clamping the thin film without cutting the separate thin film 35 that cuts the thin film 35 with an appropriate size, thereby providing an effect of improving work efficiency.

  The thin film stretching process by the thin film stretching apparatus according to the present invention will be described as follows. First, when the lower plate mold (32) is inserted into the lower plate mold insertion groove formed in the base (10), the thin film (35) is formed on the upper surface of the lower plate mold (32) by the roll supply unit (50) or the like. To position. At this time, the width and length of the thin film 35 are made larger than the entire area of the lower plate mold so that clamping can be performed by the outer clamp 44.

  Next, a primary press operation in which the outer clamp (40) is moved downward by the clamp cylinder (44) and the outer shell of the thin film (35) located at the periphery of the base (10) is crimped, and the vertical transfer section The secondary pressing operation (20) for combining the upper plate mold (30) with the lower plate mold (32) is performed simultaneously or sequentially.

  At this time, the vacuum pump (60) provides a vacuum state while the primary press operation and the secondary press operation are in progress to extend the thin film (35), and the sound pressure generating part (70) is the extended thin film. The test sound pressure is provided to the film, and the tension value of the thin film 35 is automatically measured.

  When the above operation is completed, the fastening screw 36 is coupled to the fastening screw grooves 30a and 32b formed in the upper plate mold 30 and the lower plate mold 32 as shown in FIG. The thin film (35) positioned between the upper plate mold (30) and the lower plate mold (32) is maintained in a stretched state by a method or the like. More preferably, the lower plate mold (32) further includes a square five ring groove (32b) in which a square five ring (33) made of an elastic material capable of maintaining airtightness such as an EDPM material is stored. ) Can be connected to the lower mold (32) through a square five ring (33). EDPM is a synthetic rubber series and has general rubber characteristics, but has an advantage that it is particularly excellent in stretch ratio, weather resistance, heat resistance and the like.

  When the bonding of the upper plate mold (30) and the lower plate mold (32) is completed and only the vertical transfer part (20) is raised, the upper plate mold (30), the thin film (35), and the lower plate mold (32) are bonded. The peripheral portion of the thin film (35) which is raised in a state and maintained in pressure contact by the outer clamp is automatically removed.

  Incidentally, the preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art should be able to make various modifications, changes and additions within the spirit and scope of the present invention. Such modifications, changes and the like should be regarded as belonging to the following claims.

The perspective view of the expansion | extension apparatus of the thin film which concerns on embodiment of this invention. The front view of the expansion | extension apparatus of the thin film which concerns on embodiment of this invention. The side view of the expansion | extension apparatus of the thin film which concerns on embodiment of this invention. The block diagram of the expansion | extension apparatus of the thin film which concerns on embodiment of this invention. The top view of the base concerning the embodiment of the present invention. Sectional drawing of the base which concerns on embodiment of this invention. The assembly drawing of the upper-plate mold lower-plate mold which concerns on embodiment of this invention. The front view and side view of the roll supply part which concern on embodiment of this invention.

Explanation of symbols

10: Base, 20: Vertical transfer device, 30: Upper plate mold, 31: Buffer member, 36: Guide post, 38: Ball bushing bearing, 40: Outer clamp, 44: Clamp cylinder, 50: Roll supply unit, 60: Vacuum pump, 62: vacuum suction part, 70: sound pressure generating part, 72: copper plate, 32: lower mold.

Claims (9)

A lower plate mold insertion groove for inserting the lower plate mold is formed on the upper surface, a vacuum suction portion is formed around the lower plate mold insertion groove, and a sound pressure applying hole is installed at the center portion. ;
An up-and-down transfer part that is vertically spaced from the upper surface of the base and moves vertically with respect to the base;
An upper plate mold that is detachably attached to the end of the upper and lower transfer unit and moves vertically with respect to the base to be coupled to the lower plate mold at the lowest point;
An outer clamp positioned between the base and the upper and lower transfer unit, and vertically moving with respect to the base to press the thin film positioned on the outer portion of the lower plate mold at the lowest point;
A vacuum pump for providing a vacuum to the vacuum suction section; and
It is attached to the bottom surface of the base, and includes a sound pressure generator that provides a test sound pressure to the thin film through the sound pressure application hole,
When the thin film is positioned on the upper surface of the lower plate mold, the outer clamp presses the outer portion of the thin film, and the upper and lower transfer portions are inserted into the base. The vacuum pump is connected to a mold, the vacuum pump provides a vacuum state to stretch the thin film, and the sound pressure generating unit provides a test sound pressure to the stretched thin film. Automatic thin film stretcher using pressure.   The automatic thin film stretching apparatus using vacuum pressure according to claim 1, wherein the upper plate mold is coupled to the vertical transfer unit through a buffer member.   3. The automatic thin film stretching apparatus using vacuum pressure according to claim 2, wherein the buffer member abuts on four edge portions of the upper plate mold.   The automatic transfer unit using vacuum pressure according to claim 1 or 2, wherein the up-and-down transfer unit is installed on a first support member extended on one side of the base and bent at an upper part. Thin film stretcher. The upper and lower transfer part further includes an upper plate mold mounting means at the end, and the upper plate mold is detachably attached to the lower part of the mounting means;
Two guide posts are further included in the upper part of the upper plate mounting means, and the first support member further includes a ball bush bearing at a position where the guide posts are slid. An automatic thin film stretching apparatus using a vacuum pressure according to claim 4.   The vacuum according to claim 1 or 2, wherein the outer clamp moves up and down by clamp cylinders respectively installed on two second support members extended at the rear side of the base. Automatic thin film stretcher using pressure.   The vacuum apparatus according to claim 1 or 2, wherein the automatic thin film stretching apparatus further includes a roll supply unit that is installed on a rear surface of the base and supplies the thin film in a roll state. Automatic thin film stretcher used.   The lower plate mold further includes a square five ring groove in which a square five ring made of an elastic material capable of maintaining airtightness is stored, and the upper plate mold mediates the lower plate through the square five ring. The automatic thin film stretching apparatus using vacuum pressure according to claim 1, wherein the thin film stretching apparatus is combined with a mold.   3. The automatic thin film stretching apparatus using vacuum pressure according to claim 1, wherein the base further includes a copper plate on which a sound pressure applying hole is formed.

Images