JP2011025520A - Injection molding part equipped with glass window and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a glass plate when inserting in injection molding. <P>SOLUTION: In an injection molding part equipped with a glass window, the glass window is made by inserting the glass plate 20 in injection molding. The glass plate is a rectangular shape wherein the length L is 15.0 [mm] or less and the width W is 7.5 [mm] or more, and the thickness T is 0.3-0.6 [mm]. The resin molding part 10 of the injection molding part includes an abutting surface 11 abutting to a front surface side of the glass plate and a plurality of holding parts 12 for holding the corner parts of the glass plate respectively. In the manufacturing method, a mold 100 of an injection molding device for performing the injection molding is equipped with a plurality of vacuum holes 121 for sucking the glass plate. The plurality of vacuum holes have the same distance from the center o of the glass plate, and the minimum circle O which has the center of the center o of the glass plate and includes the plurality of vacuum holes is set so that the relationship of (1/3)W≤D≤(2/3)W is established when the diameter is D. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injection molded part in which a glass window is configured by inserting a glass plate during injection molding, and a method for manufacturing the same.

  The case body of the imaging apparatus is provided with a glass plate that reflects a predetermined wavelength. Moreover, the structure which inserts a glass plate at the time of injection molding of a case body is made | formed. Patent Documents 1 and 2 disclose this type of imaging apparatus.

JP-A-8-72094 International Publication No. 2007/043509 Panfred

  Now, there are various types of injection-molded parts provided with glass windows, and the shape and thickness of the glass plate to be inserted are also various. Therefore, in the manufacturing site, ingenuity is required so that better injection molding can be performed according to the shape and thickness of the glass plate. Regarding the case body of the imaging device, it is particularly necessary to pay attention to the breakage of the glass plate at the time of injection molding, and it is required to specify the shape of the resin molded portion and the conditions for injection molding while taking this into consideration.

  This invention is made | formed in view of this situation, The objective is to prevent the failure | damage of the glass plate inserted at the time of injection molding.

  The invention described in claim 1 of the present application is an injection molded part provided with a glass window, wherein the glass window is formed by inserting a glass plate at the time of injection molding, and the glass plate has a length L of 15. 0.0 [mm] or less, a width W of 7.5 [mm] or more, and a thickness T of 0.3 to 0.6 [mm], the resin molded part of the injection molded part Is an injection-molded part including a glass window having a configuration including a contact surface that contacts the front side of the glass plate and a plurality of holding portions that respectively hold corner portions of the glass plate.

  The invention described in claim 2 of the present application is a method of manufacturing an injection molded part having a glass window, wherein the glass window is formed by inserting a glass plate during injection molding, and the glass plate has a length. L has a rectangular shape of 15.0 [mm] or less and a width W of 7.5 [mm] or more, and has a thickness T of 0.3 to 0.6 [mm]. The resin molding unit includes a contact surface that contacts the front side of the glass plate, and a plurality of holding units that respectively hold the corners of the glass plate, and the mold of the injection molding apparatus that performs the injection molding includes: A plurality of suction holes for adsorbing the glass plate are provided, and the resin flows in with the glass plate adsorbed, and the plurality of suction holes are equal in distance from the center o of the glass plate, Centering on the center o of the plate and the plurality of suction holes The smallest circle O is an injection molded part provided with a glass window having a configuration in which the relationship of (1/3) W ≦ D ≦ (2/3) W is established, where D is the diameter. It is a manufacturing method.

  The invention described in claim 3 of the present application is that, in claim 2, the plurality of suction holes are provided in a portion facing the contact surface across the glass plate, and the diameter of the suction holes is d. Then, it is a method for manufacturing an injection-molded part provided with a glass window having a configuration set so that the relationship d ≦ (1/2) T is established.

  According to the present invention, it is possible to prevent breakage of a glass plate inserted during injection molding. The concept will be described below.

  The glass plate is fixed to the resin molded portion by a contact surface provided in the resin molded portion and a plurality of holding portions.

  A rectangular glass plate is easier to process than a circular one, but has the disadvantage of being easily damaged during injection molding. For this reason, the present condition is that the glass plate having the shape and thickness specified in the present invention is formed by bonding a predetermined injection-molded part to the injection-molded part. The inventor of the present application has repeated the manufacturing experiment to insert such a glass plate and achieved the present invention.

  According to the manufacturing experiment of the inventor of the present application, it has been found that the breakage of the glass plate largely depends on the fixing structure of the glass plate with respect to the resin molded portion. The glass plate fixing structure is basically provided with a contact surface that contacts the front side of the glass plate in the resin molded portion and a portion that supports the glass plate in contact with the contact surface. That portion is a portion that goes from the contact surface side to the thickness direction and the back surface of the glass plate. When the portion covers the entire periphery of the glass plate, breakage of the glass plate was remarkable. This is considered to be because the balance of the pressure that the glass plate receives from the resin during the injection molding is poor. This seems to be a problem unique to non-circular shapes. Therefore, the inventors of the present application clearly improved the problem of breakage of the glass plate when the glass plate was supported at each corner of the glass plate while supporting the glass plate in contact with the contact surface. That is, this is a plurality of holding portions that respectively hold the corner portions of the glass plate.

  Furthermore, the inventor of the present application examined the positional relationship of the suction holes provided in the mold of the injection molding apparatus. In general, a mold is provided with a suction hole that sucks a member to be inserted into a predetermined position. This is so-called air tweezers.

  The suction holes are preferably provided in the vicinity of the corners of the glass plate in that the glass plate is accurately and reliably adsorbed at a predetermined position. However, considering the relationship between the pressure that the glass plate receives from the resin during injection molding and the difference in thermal expansion coefficient between the glass plate and the inflow resin, the position is somewhat to the center of the glass plate rather than near the corners. I think it is better to send them. Therefore, when a manufacturing experiment was performed by changing the position of the suction hole, a plurality of suction holes having the same distance from the center o of the glass plate were provided in terms of preventing breakage of the glass plate employed in the present invention. At this time, when the diameter of the smallest circle O centering on the center o of the glass plate and including a plurality of suction holes is D, the relationship of (1/3) W ≦ D ≦ (2/3) W is established. It turned out to be advantageous to set it to hold. That is, the diameter D of the circle O is set with respect to the width W of the glass plate 20. The length L of the glass plate 20 is more advantageous as it is closer to the width W. A more desirable relationship is (1/3) L ≦ D ≦ (2/3) W based on the length L.

  According to the present invention, it is possible to prevent the glass plate inserted during the injection molding from being damaged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a front side showing an injection molded part according to an embodiment of the present invention. It is an external view of the back side which shows the injection-molded part in the Example of this invention. (A) is a front view showing an injection-molded part, (b) is a side sectional view showing an injection-molded part, and (c) is a rear view showing the injection-molded part according to an embodiment of the present invention. It is explanatory drawing which shows the metal mold | die of the injection molding apparatus which concerns on the Example of this invention and performs the said injection molding. It is explanatory drawing which concerns on the Example of this invention and shows the positional relationship of a glass plate and a suction hole. It is explanatory drawing which concerns on the Example of this invention and shows the positional relationship of a glass plate and a suction hole.

  Embodiments of the present invention will be described below with reference to the drawings. An injection molded part 1 having a glass window shown in FIGS. 1 to 3 is a casing part that constitutes the front side of a CCD camera. The glass window is formed by inserting a glass plate 20 during injection molding.

  The glass plate 20 transmits visible light without transmitting infrared light. As the glass plate 20, an IR cut filter formed by forming a dielectric multilayer film on a glass substrate or a quartz optical low-pass filter is employed.

  The glass plate 20 has a rectangular shape with a length L of 15.0 [mm] or less, a width W of 7.5 [mm] or more, and a thickness T of 0.3 to 0.6 [mm]. It is. Conventionally, the glass plate 20 having such a shape and thickness is provided by bonding after molding a predetermined injection-molded part. In this example, the glass plate 20 is inserted. The technical idea based on an empirical rule for inserting the glass plate 20 under such conditions without damaging it is a point of the present invention.

  The resin molding part 10 of the injection molded part 1 includes a contact surface 11 that contacts the front side of the glass plate 20 and a plurality of holding parts 12 that respectively hold the corners of the glass plate 20.

  As shown in FIG. 4, a mold 100 of an injection molding apparatus that performs injection molding includes a fixed mold 110 and a movable mold 120. The movable mold 120 is provided with a plurality of suction holes 121 for sucking the glass plate 20, and each suction hole 121 flows in the resin in a state where the glass plate 20 is sucked.

  As shown in FIG. 5, in the case of this example, the plurality of suction holes 121 include a vertical bisector A with respect to the side in the length L direction of the glass plate 20 and a vertical bisector B with respect to the side in the width W direction. Are provided symmetrically to each other. The intersection of the line A and the line B is the center o of the glass plate 20.

  The plurality of suction holes 121 are equally spaced from the center o of the glass plate 20. The minimum circle O centered on the center o of the glass plate 20 and including the plurality of suction holes 121 is (1/3) W ≦ D ≦ (2/3) W, where D is the diameter. The relationship was set to hold. More specifically, the relationship of (1/3) L ≦ D ≦ (2/3) W was established.

  The shape of the edge of the contact surface 11 is a circle centered on the center o of the glass plate 20, and is the same as or larger than the diameter D of the circle O. In the illustrated example, it is slightly larger than the diameter D. That is, the plurality of suction holes 121 are provided at a portion facing the fixed mold 110 with the glass plate 20 interposed therebetween. The diameter d of the suction hole 121 is set to be equal to or smaller than the thickness T of the glass plate 20.

  Alternatively, as shown in FIG. 6, the shape of the edge portion of the contact surface 11 may be smaller than the diameter D of the circle O depending on the type of the injection molded part 1 to be manufactured. The plurality of suction holes 121 are provided at portions facing the contact surface 11 with the glass plate 20 interposed therebetween. In this case, at the time of injection molding, the pressure from the resin is applied to the portion of the glass plate 20 sucked by the suction hole 121 in the same direction as the suction direction. Therefore, if the strength of the glass plate 20 cannot withstand that pressure, it will be damaged.

  Therefore, in the example shown in FIG. 6, the diameter d of the suction hole 121 is set to be smaller than that in the example shown in FIG. 5 in order to deal with such a problem. Specifically, the relationship d ≦ (1/2) T is established. More preferably, the relationship d ≦ (1/3) T may be set.

  According to this example, it is possible to prevent the glass plate inserted during the injection molding from being damaged. In addition, it is needless to say that the configuration of each part in the present example can be appropriately changed in design within the technical scope described in the claims, and is not limited to that illustrated in the drawings.

  The injection molded part provided with the glass window according to the present invention can be suitably used as a casing part constituting the front side of the CCD camera.

DESCRIPTION OF SYMBOLS 1 Injection molding component 10 Resin molding part 11 Contact surface 12 Holding part 20 Glass plate 100 Mold of injection molding apparatus 110 Fixed side mold 120 Movable side mold 121 Suction hole

Claims (3)

In injection molded parts with glass windows,
The glass window is formed by inserting a glass plate at the time of injection molding,
The glass plate has a rectangular shape with a length L of 15.0 [mm] or less, a width W of 7.5 [mm] or more, and a thickness T of 0.3 to 0.6 [mm]. Yes,
The resin molding part of the injection-molded part comprises a glass window comprising a contact surface that contacts the front side of the glass plate and a plurality of holding parts that respectively hold the corners of the glass plate. Injection molding parts provided. In a method for manufacturing an injection molded part having a glass window,
The glass window is formed by inserting a glass plate at the time of injection molding,
The glass plate has a rectangular shape with a length L of 15.0 [mm] or less, a width W of 7.5 [mm] or more, and a thickness T of 0.3 to 0.6 [mm]. Yes,
The resin molded part of the injection-molded part includes a contact surface that contacts the front side of the glass plate, and a plurality of holding parts that respectively hold the corners of the glass plate,
The mold of the injection molding apparatus that performs the injection molding includes a plurality of suction holes that adsorb the glass plate, and flows resin in a state of adsorbing the glass plate,
The plurality of suction holes are equally spaced from the center o of the glass plate,
The minimum circle O centered on the center o of the glass plate and including the plurality of suction holes has a relationship of (1/3) W ≦ D ≦ (2/3) W, where D is the diameter. A method of manufacturing an injection molded part having a glass window, characterized in that it is set so as to hold. The plurality of suction holes are provided in a portion facing the contact surface across the glass plate,
3. The method for manufacturing an injection-molded part with a glass window according to claim 2, wherein a relationship of d ≦ (1/2) T is established, where d is the diameter of the suction hole.

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