JPS63193174A - Manufacture of printed display panel for camera lens barrel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a printed display board that prints and displays characters, scales, etc. and is attached to the lens barrel of a camera. The present invention relates to a method of manufacturing a printed display board having the following method.

[Prior art] Various characters and scales are displayed on the lens barrel of a camera, and it would be a difficult task to print or engrave each character or scale on the surface of the lens barrel. It takes time.

Therefore, conventionally, as shown in FIG. 5, printing is done on the back side of a transparent synthetic resin plate 51 that is bent to match the shape of the area to be displayed, and the synthetic resin plate 51 is attached to the lens barrel. It was attached to the surface.

[Problems to be Solved by the Invention] As described above, in the conventional method, printing was performed on the back side of the synthetic resin plate 51 that was formed by bending it in advance.
If 1 is small, there is no problem, but as the synthetic resin plate 61 becomes longer and approaches a semicircular arc shape as shown in Fig. 6, printing must be performed in 4 or 5 times by changing the direction. Must be.

Moreover, in the case of multi-color printing, printing must be performed the number of times multiplied by the number of colors, which increases the amount of work time and makes it unprofitable.

Therefore, it is conceivable to heat and bend the synthetic resin plate after printing on a flat synthetic resin plate, but if you actually do this, for example, as shown in Fig. 7, the synthetic resin plate 71 Warpage and distortion occurred, making it impossible to obtain a shape that could be used in products.

Therefore, conventionally, as shown in FIG. 8, a small printed synthetic resin plate 51 was attached only to the center of the lens barrel.
Both sides are directly printed or engraved on the surface of the lens barrel 52, resulting in considerable manufacturing costs for such markings.

The present invention eliminates such conventional drawbacks and provides a method for manufacturing a printed display board for a camera barrel, which allows the printed display board to be manufactured easily and inexpensively without causing warping or distortion. The purpose is to

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method for manufacturing a printed display board for a camera lens barrel according to the present invention includes printing on the back side of a transparent and flat synthetic resin board, and then The synthetic resin plate is heated to a temperature at which it begins to soften, and the mold with the concave curved surface is heated to a temperature between the above softening temperature and room temperature, and the mold is heated to a temperature between the above softening temperature and room temperature, and the mold is heated to a temperature between the above softening temperature and room temperature. The synthetic resin plate is brought into close contact with the concave curved surface by sliding the synthetic resin plate heated to a certain degree and pressing the end of the synthetic resin plate against a stopper protruding from the end of the concave curved surface. It is characterized by being molded.

[How it works: First, we print on the back side of a flat synthetic resin board, so we only need to print once for each color.

Next, when a synthetic resin plate heated to a temperature where it begins to soften is slid along the concave curved surface formed in the mold,
The synthetic resin plate advances while bending into a shape that almost follows a concave curved surface.

By pressing the end of the synthetic resin plate against the stopper,
The synthetic resin plate is pressed against the concave curved surface and comes into close contact with the concave curved surface, forming a printed display board having a constant shape that matches the shape of the concave curved surface. At this time, since the mold is heated to a temperature between the softening temperature of the synthetic resin board and room temperature, the softened synthetic resin board cools down relatively slowly, causing warping and distortion in the molded printed sign board. No, □ [Example] Figures 1 to 4 concerning an example of the present invention! The explanation will be based on j.

First, print on the back side of a transparent synthetic resin board.

As the synthetic resin, for example, acrylic resin (polymethyl methacrylate, etc.) is used. In order to reduce the time required for printing, for example, as shown in Figure 3, it is recommended to print several dozen pieces on a large synthetic resin board material l.
The size of one synthetic resin plate 1a, lb... is 1, for example, 100 x 15 x 1. In this example, there are 40 pieces, so even in the case of 5-color printing, the printing operation is performed 5 times. By doing so, 40 synthetic resin plates 1a, lb.
The printing of ... is completed. In addition, the synthetic resin plates 1a, lb...
・Cover the surface side with a protective film to prevent scratches until it is attached to the camera barrel.

After printing is completed, the synthetic resin board is cut into individual sheets and heated to a temperature at which the synthetic resin board begins to soften.
Any method may be used to heat the synthetic resin plate, but for example, as shown in FIG. It is sufficient to place the plate 1a on it for a certain period of time (for example, 5 seconds), and the temperature of the hot plate 2 is between 140 and 180℃.
The temperature is preferably about 0°C, and more preferably about 150 to 170°C.

Separately from this, a mold in which a concave curved surface matching the shape of the printed display board to be formed is formed is heated to a temperature between the above-mentioned softening temperature and room temperature. In this embodiment, as shown in FIG. 1, a concave curved surface 4 in the shape of an approximately semicircular arc is formed on a mold 3 made of a relatively heat-resistant material such as Bakelite resin. However, this mold 3 heated to about 50 to 80° C. was used. It is more preferable if the temperature is about 60 to 70°C. If this temperature is too low, the synthetic resin plate 1a will be cooled rapidly and warp or distortion as shown in FIG. 7 will occur; If is too high, it will be difficult to mold one synthetic resin plate la into the shape of a concave curved surface.

Along the concave curved surface 4 of the mold 3 heated to a temperature between the softening temperature of the synthetic resin plate and room temperature, as shown in FIG. 1, the synthetic resin plate 1a heated to about the softening temperature is Press and slide. At this time, set the synthetic resin plate 1a so that the printed surface is on the inside of the curvature.

As the synthetic resin plate 1a is pushed and slid, the front surface of the synthetic resin plate 1a bends into a shape along the concave curved surface 4. When the end of the synthetic resin plate 1a hits the stopper 5 provided protruding from the end of the concave curved surface 4, the synthetic resin plate 1a stops advancing any further and is pressed against the concave curved surface 4, and is brought into close contact with the concave curved surface and cooled. be done. In this way, as shown in FIG. 2, a printing display board 10 having a constant shape matching the shape of the concave curved surface 4 formed on the mold 3 is formed.

In this embodiment, as shown in FIG. 1, the stopper 5 was not fixed, but was biased by the first spring 6 in a direction opposite to the advancing direction of the synthetic resin plate 1a. The side that pushes the synthetic resin plate 1a is also pressed via a second spring 7 having the same spring constant as the first spring 6. By doing so, the force for pressing the synthetic resin plate 1a against the concave curved surface 4 becomes uniform, and printing sign boards 10 having a desired shape can be stably mass-produced.

[Effects of the Invention] According to the method for manufacturing a printed display board for a camera barrel of the present invention,
Since printing is performed on a flat plate, 1. Even when molding a greatly curved printing display board, such as a semicircular shape, 1.
Only one printing is required for each color, and the molding process is simple, as the synthetic resin plate heated to a temperature where it begins to soften is simply slid along a concave curved surface. Since it is pressed against a concave curved surface and cooled relatively slowly, it is molded into a constant shape without warping or distortion, and has the excellent effect of stably mass-producing homogeneous printed display boards at low cost.

[Brief explanation of the drawing]

FIGS. 1 to 4 are schematic diagrams showing each step of a method according to an embodiment of the present invention, and FIGS. 5 to 8 are schematic diagrams each showing a printed sign board manufactured by a conventional method. . DESCRIPTION OF SYMBOLS 1...Synthetic resin board material, la, lb...Synthetic resin board, 2...Hot plate, 3...Mold, 4...Concave curved surface, 5...Stopper, 10...Printing Display board. Figure 3 Figure 4 Figure 5 Figure 6

Claims (5)

[Claims] (1) After printing on the back side of a transparent and flat synthetic resin board,
The synthetic resin plate is heated to a temperature at which it begins to soften, and the mold with the concave curved surface is heated to a temperature between the above softening temperature and room temperature, and the mold is heated to a temperature between the above softening temperature and room temperature, and the mold is heated to a temperature between the above softening temperature and room temperature. The synthetic resin plate is brought into close contact with the concave curved surface by sliding the synthetic resin plate heated to a certain degree and pressing the end of the synthetic resin plate against a stopper protruding from the end of the concave curved surface. A method for manufacturing a printed display board for a camera lens barrel, characterized in that it is molded. (2) The method for manufacturing a printed display board for a camera lens barrel according to claim 1, wherein the temperature at which the synthetic resin board is heated is 140 to 180°C. (3) The method for manufacturing a printed display board for a camera lens barrel according to claim 1 or 2, wherein the temperature of the mold is 50 to 80°C. (4) The method for manufacturing a printed display board for a camera lens barrel according to any one of claims 1 to 3, wherein the shape of the concave curved surface is a circular arc. (5) The method for manufacturing a printed display board for a camera lens barrel according to claim 4, wherein the synthetic resin board is molded into a substantially semicircular shape.