JPH0411367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a mold for manufacturing a roof mirror array used in optical systems of copying machines, facsimiles, and the like.

Prior Art An example of an optical system using a rooftop mirror array is the optical system of a copying machine as shown in FIG. To functionally explain this optical system, the light source 1
The light emitted from the original 2 is reflected by the original 2, this reflected light is reflected by one reflective surface of the right-angle mirror 3, passes through the lens array 4, and then passes through the roof mirror array 5.
and passes through the lens array 4 again.
The light is reflected by the other reflective surface of the right-angle mirror 3 and formed on the photoreceptor 6 as an erect real image.

As described above, the use of the roof mirror array 5 has the advantage that the optical path length can be shortened and a compact optical system can be obtained, compared to an optical system using a spherical lens.

This roof mirror array 5 is configured as shown in FIG. 2, for example. In other words, roof mirror array 5
consists of a roof mirror array main body 8 made up of a plurality of consecutive roof mirror parts 8a, and a rim part 9 formed around this main body 8, and a roof mirror surface 8b is formed on one surface of the roof mirror part 8a. The light is reflected by the mirror surface 8b. This continuous roof mirror surface 8b needs to be formed so that each angle is a right angle in order to form an erect real image on the photoreceptor 6.

Such a roof mirror array 5 is, for example,
It is made of resin material such as PMMA (polymethyl methacrylate) resin and is molded using a mold. Specifically, in order to form the roof mirror surface 8b, a plurality of gold pieces whose upper surfaces are roof surfaces are arranged adjacently in a line. In this arrangement method, the respective sides of each gold piece are brought into contact with each other, and the pieces are sandwiched from both sides by a pair of side blocks. Then, resin was cast here to form a roof mirror surface 8b using the roof surface of the gold piece.

However, in the case of such a roof mirror array mold, the positioning of multiple metal pieces was simply by holding them between side blocks from both sides, so when placing the metal pieces, that is, when assembling the mold, a collimator was used to position each metal piece. Even if the inclination of the pieces is measured, individual adjustments cannot be made, and the angles of consecutive roof surfaces may not be at right angles. Also, if the clamping force of the side blocks is weak, the pieces may tilt due to pressure during molding. This caused a problem in that the angles of the continuous roof mirror surfaces 8b of the molded roof mirror array 5 were not right angles.

Purpose This invention was made in view of the above-mentioned conventional situation, and it is possible to individually adjust the tilt of each gold piece and also fix it, and by adjusting the tilt when the gold pieces are arranged, each gold piece can be adjusted. A mold for molding a roof mirror array that allows the pieces to be placed in the correct posture and maintain the regular posture without tilting even when subjected to pressure during molding, making it possible to mold a high-precision roof mirror array. is intended to provide.

composition The present invention will be explained below based on the drawings.

3 to 13 are diagrams showing an embodiment of the present invention.

First, to explain the structure, the roof mirror array molding die has a movable side mold 2 shown in FIGS. 3 and 4.
1 and a stationary side mold 51 shown in FIGS. 11 and 12, and these molds 21 and 51 are combined as shown in FIG. 13.

The movable mold 21 has a movable cavity unit 31 for forming a roof mirror surface on the movable mold main body 22.
is installed and configured.

Specifically, this movable cavity unit 3
1, as shown in FIGS. 5 to 10, a unit base 32, a runner block 33, right and left side blocks 34, 35, a plurality of gold pieces 36, and a number corresponding to the number of these gold pieces 36. It is constructed by assembling a positioning screw 37 and a tilt adjustment member 38. The unit base 32 has substantially rectangular parallelepiped-shaped positioning side parts 40 and 41 formed on both sides along the longitudinal direction of a rectangular plate-shaped base body 39. A pair of fitting grooves 39a are formed on both sides of the base body 39 on the side of the positioning side part 41, and a plurality of insertion holes 39b passing through in the vertical direction are formed at appropriate intervals between the fitting grooves 39a. There is. Furthermore, two mounting recesses 40a are formed in the outer wall of the positioning side portion 40. In the positioning side part 41 on the opposite side, a groove 41a extending horizontally is formed in the outer wall, and screw holes 41b penetrating from this groove 41a in the width direction of the positioning side part 41 have the same spacing and number as the insertion holes 39b. It is formed. A runner block 33 is attached to such a unit base 32. That is, the runner block 33 has a substantially rectangular parallelepiped shape, and the positioning side portions 40,
It is formed to the same length and height as 41, and the lower surface 3
3a is in contact with the base body 39, and one side surface 33b along the longitudinal direction is the positioning side portion 4.
0, and is attached to the base body 39 with a plurality of vertical bolts 42 and to the positioning side part 40 with a plurality of horizontal bolts 43. By attaching with this runner block 33, the side surface 3 of the runner block 33
A built-in groove 44 of a predetermined width is formed between the side surface 33c on the opposite side to the side surface 3b and the inner surface 41c of the positioning side portion 41.
is formed. Both side surfaces 33c and 41c are lapped. A plurality of gold pieces 36 are installed in a row adjacent to each other in this installation groove 44. As shown in FIGS. 10a and 10b, this gold piece 36 has a substantially rectangular prism shape and has a roof mirror array 5 on its upper surface.
A roof surface 36a forming a roof mirror surface 8b, a contact surface 36b whose side surface along the arrangement direction of the metal pieces 36 contacts the side surface 33c of the runner block 33 and the inner surface 41c of the positioning side part 41, and the other side surface from the adjacent metal surface 36a. A contact surface 36c that comes into contact with the piece 36,
Further, the lower surface is the bottom surface of the installation groove 44, that is, the mounting surface 36d that comes into contact with the base body 39. This roof surface 36a is formed with very high precision by mirror finishing, and each of the other surfaces 36b, 36c, 3
6d is not so highly precise, but it is formed with good precision by lap processing. Also, this gold piece 3
6 is formed with a passage hole 36e that penetrates in the arrangement direction, and this hole 36e continues with the arrangement of the gold pieces 36. Furthermore, this gold piece 36 has a mounting surface 3.
A screw hole 36f opening at 6d is formed in the vertical direction. These gold pieces 36 are held between a pair of right and left side blocks 34 and 35. That is, the right and left side blocks 34, 35 are placed on the base body 39, and rectangular parallelepiped-shaped side blocks 33d, 40c, 41d that abut on the respective side surfaces 33d, 40c, 41d along the width direction of the runner block 33 and the positioning side parts 40, 41. Placing block parts 34a, 35a, and fittings that protrude from the placing blocks 34a, 35a, fit into the fitting grooves 39a of the base body 39, and press the metal pieces 36 located on both sides of the base body 39. It consists of block parts 34b and 35b.
The contact surfaces 34c and 35c of the fitting block portions 34b and 35b that come into contact with the gold pieces 36 are lapped. Such right and left side blocks 34, 35 are connected to the base body 39 with a plurality of vertical bolts 45, and to the runner block 33 and the positioning side part 40, with a plurality of horizontal bolts 46.
It is attached to 41. Now multiple gold pieces 3
6 is being held. In this state, the passage holes 34d and 35d communicating with the passage hole 36e of the gold piece 36 are
It is formed on the right and left side blocks 34 and 35. A positioning screw 37 and a tilt adjustment member 38 are provided for each gold piece 36.
That is, the positioning screw 37 is attached to the base body 39.
It is inserted upward through the insertion hole 39 from below and is screwed into the screw hole 36f of the gold piece 36.
On the other hand, the inclination adjustment member 38 is composed of a pin 38a, an immobilis 38b and a nut 38c.The pin 38a is first inserted into the screw hole 41b from the groove 41a side of the positioning side part 41, and the immobilis 38b is screwed together. Imobis 38b and Natsuto 38
c is screwed together. The tip of the pin 38a is in contact with the contact surface 36b of the gold piece 36.

As shown in FIGS. 3, 4, and 13, such a movable cavity unit 31 is attached to the movable mold body 22 to constitute the movable mold 21. In the movable mold body 22, a movable mold plate 25 having a U-shaped cross section is placed on a movable mounting plate 23 via a pair of spacer blocks 24, and an ejector pin 2 is placed between both spacer blocks 24.
6. An ejector plate 29 to which a sprue lock pin 27 and a return pin 28 are attached is arranged to be vertically movable. This movable side template 2
The above-mentioned movable cavity unit 31 is fitted into the U-shape 5.

On the other hand, as shown in FIGS. 11, 12, and 13, the fixed side mold 51, the locate ring 53, the sprue bushing 54, and the fixed side mold plate 55 having a U-shaped cross section are fixed to the fixed side mounting plate 52. The fixed side cavity unit 56 is fitted into the U-shape of the fixed side mold plate 55 and is assembled. Fixed side cavity unit 56
A wavy portion 57 is provided to form a surface opposite to the roof mirror surface 8b of the roof mirror portion 8a of the roof mirror array 5, and groove portions 58 are provided on both sides of the wavy portion 57 to form the rim portion 9. It is being Further, a passage hole 59 is formed near the corrugated portion 57 and extends through the stationary mold 51 in the longitudinal direction.

The fixed side mold 51 and the movable side mold 21 as described above
The roof mirror array molding mold is made up of the following:

Next, how to assemble the movable cavity unit 31 will be explained. First, unit base 32
Then, fix the runner block 33 with bolts 42 and 43. In this state, the gap between the side surface 33c of the runner block 33 and the inner surface 41c of the positioning side portion 40, that is, the width of the built-in groove 44, has a plus error of about several microns with respect to the width of the gold piece 36. Next, attach the left side block 35 to the unit base 32 and runner block 33 with bolts 45 and 46.
Fixed to. Thereafter, one gold piece 36 is pushed and slid from the right side block 34 side into the installation groove 44 to the left in FIGS. 35c
bring it into contact with. Since the error during this sliding is several microns, the gold piece 36 slides smoothly without wobbling, and of course there is no wobbling when the slide is completed. From this state, first, the positioning screw 37 is inserted into the screw hole 36f of the gold piece 36 from the lower surface side of the base body 39 through the insertion hole 39b, and temporarily fixed. Next, insert the pin 38a into the screw hole 41b of the positioning side part 41 from the groove 41a side, screw the immobilis 38b, screw the nut 38c onto the immobilis 38b, and lightly press the gold piece 36 with the pin 38a. do. Here, adjust the gold piece 36 while measuring the inclination of the gold piece 36 using a device such as a collimator, and when the gold piece 36 is in its normal posture, completely tighten the positioning screw 37, and then 36d is brought into contact with the bottom of the installation groove 44, and the immobilis 38b is also completely tightened.Finally, the nut 38c is tightened, and the gold piece 3 is tightened.
Fix 6 in the normal position. This operation is performed for all the gold pieces 36, and the gold pieces 36 are arranged in a line in the installation groove 44. After that, right side block 3
4 is fixed to the runner block 33 and unit base 32 with bolts 45, 46, and a plurality of gold pieces 36 are held between both side blocks 34, 35. This completes the assembly of the movable cavity unit 31.

When assembled in this way, each gold piece 36 will have
Since the positioning screw 37 and the inclination adjustment member 38 are provided, the inclination of each gold piece 36 can be adjusted independently, and each gold piece 36 can be firmly fixed in a normal posture. .

Moreover, if the assembly is carried out according to such a procedure, the assembly can be completed in one operation, so that the assembly of the movable cavity unit 31, that is, the movable mold 21 can be completed in a shorter time than conventionally. By the way, in the past, multiple gold pieces were arranged by being held between both side blocks, so if it was found by measurement that the gold pieces were tilted after being held between both side blocks, it was necessary to loosen both side blocks again. Since the tilted gold piece 10 had to be replaced with another gold piece, the adjustment was very troublesome and the assembly took a long time.

The movable cavity unit 31 assembled in this manner is attached to the movable mold plate 25 using the mounting recess 40a.

The explanation of how to assemble parts other than the movable cavity unit 31 will be omitted.

Now, a method for molding the roof mirror array 5 using this roof mirror array molding mold will be explained. First, as shown in FIG. 13, the movable mold 21 and the fixed mold 51 are matched. After that, the melted plasticized resin material, such as PMMA (polymethyl methacrylate) resin, is sprued into sprue A.
It is injected into cavity D via gate C etc. Even with this pressure at the time of ejection, the gold piece 36 does not tilt and maintains its normal posture. During cooling, oil at an appropriate temperature is applied to the passage holes 34 of both side blocks 34 and 35 in the movable mold 21.
c, 35c and through passage holes 36e in which the plurality of gold pieces 36 communicate with each other, and through passage holes 59 in the stationary mold 51 to prevent distortion or the like from occurring in the molded product. The oil is passed through by suction from one opening of the passage holes 34c and 35c, and the oil is drawn from the other opening, rather than by force feeding. For this reason, since a plurality of metal pieces 36 are used in the movable mold 21, gas is removed from the contact surface of each metal piece 36 by suction force. As a result, gas does not accumulate in the valley portions of the metal pieces 36 that are in contact with each other, so that the twill line portions of the roof mirror surface 8b of the roof mirror array 5, which is a molded product, are accurately formed. Of course, since each gold piece 36 is not tilted, the angles formed by the continuous roof mirror surfaces 8b are all right angles. In addition, the roof surface 36 of the gold piece 36
Since the stationary mold 51 is provided with a corrugated portion 57 corresponding to a, the thickness of the molded product becomes almost uniform, and the occurrence of sink marks is suppressed as much as possible. Thereafter, the mold is released, and the ejector plate 29 is pushed up from the state shown in FIG. 13, and the ejector pin 26, sprue lock pin 27, and return pin 28 are raised accordingly.
The molded product, that is, the roof mirror array 5 is released from the mold by the ejector pin 26. This roof mirror array 5 consists of a plurality of gold pieces 36 that maintain a normal posture.
Since the roof mirror surface 8b is formed by the following steps, the angles formed by the continuous roof mirror surfaces 8b are all right angles. In this way, a highly accurate roof mirror array 5 is formed.

In addition, since the movable cavity unit 31 is removably provided on the movable mold body 22,
If the movable cavity unit 31 is damaged, it is only necessary to replace it, and it is not necessary to rebuild the entire movable mold 21, making it easy to repair and repairing the movable cavity unit 31.
Since the gold piece 36 and the like can be adjusted by removing the gold piece 36, adjustment work can be easily performed.

Effects As explained above, according to this invention,
Each gold piece can be adjusted and fixed individually using positioning screws and tilt adjustment members, so each gold piece can be placed in the correct position and will not tilt due to pressure during resin molding. It is possible to mold a high-precision roof mirror array, and the time required to adjust the inclination of each gold piece can be reduced compared to the conventional method, thereby achieving the effect that the mold can be assembled in a short time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the optical system of a copying machine using a roof mirror array, FIG. 2 is a perspective view including a partial cross section showing the roof mirror array, and FIGS. 3 to 13 are diagrams showing the roof mirror array of the present invention. FIG. 3 is a plan view of the movable mold, FIG. 4 is a front view including a cross section of the movable mold, and FIG.
5 is an exploded perspective view schematically showing the movable cavity unit, FIG. 6 is a plan view of the movable cavity unit, FIG. 7 is a front view including a cross section of the movable cavity unit, and FIG. The diagram is in Figure 6-
9 is a side view of the movable cavity unit, FIG. 10a is a front view of the gold piece, FIG. 10b is a sectional view of the gold piece, and FIG. 11 is the bottom of the fixed mold. FIG. 12 is a cross-sectional view of the fixed mold, and FIG. 13 is a cross-sectional view showing the movable mold and the fixed mold molded together. 5... Roof mirror array, 8b... Roof mirror surface, 21... Movable side mold, 31... Movable side cavity unit, 32... Unit base, 33...
...Runner block, 34...Right side block, 35...Left side block, 36...Gold piece,
36a... roof surface, 36b, 36c... contact surface,
36d... Placement surface, 36e... Passage hole, 36f...
... Screw hole, 37 ... Positioning screw, 38 ... Inclination adjustment member, 38a ... Pin, 38b ... Immobilis, 38c ... Nut, 44 ... Assembling groove, 51 ...
...Fixed side mold.

Claims (1)

[Claims] 1 Consists of a movable side mold and a fixed side mold, and one of the two molds includes a unit base forming an installation groove, and a substantially square unit installed adjacent to the installation groove in a row. In a roof mirror array forming mold provided with a cavity unit for forming a roof mirror surface having a plurality of columnar gold pieces and a pair of side blocks that sandwich the plurality of gold pieces from both sides,
The gold piece has an upper surface that forms a roof mirror surface of the roof mirror array, a contact surface that comes into contact with other adjacent gold pieces and the surrounding wall of the built-in groove on each side, and a lower surface that comes into contact with the bottom surface of the built-in groove. set on the mounting surface,
Further, a screw hole opening in the mounting surface is formed in the vertical direction, and the gold piece is placed in the unit base by being inserted upward from the lower surface side and screwed into the screw hole of the gold piece. a positioning screw for pressing a surface into pressure contact with the bottom surface of the built-in groove of the unit base;
A roof mirror array molding tool is provided with a tilt adjustment member that is inserted horizontally from a side surface and fixes the gold piece in a normal posture by pressing the contact surface of the gold piece with its tip. Type.